JP2009119953A - Electric assist bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric assist bicycle capable of increasing efficiency and simplifying the configuration, reducing the size and reducing the weight.
An electrically assisted bicycle 1 converts a force input to a pedal 4 into rotational power and outputs it to a crankshaft 5, a drive wheel 2, a stator 23, a first rotor 22, and a second. Energy is input / output between the rotors 24 through a magnetic circuit formed in accordance with the generation of the rotating magnetic field, and the rotating magnetic field, the second and first rotors 24, 22 And a rotating machine 20 configured to rotate while maintaining a predetermined collinear relationship between the rotation speeds of each other, and the first and second rotors 22 and 24 are connected to the crankshaft 5 and the drive. Each is connected to the wheel 2.
[Selection] Figure 1

Description

  The present invention relates to an electrically assisted bicycle including an assisting rotating machine.

  Conventionally, as this type of electrically assisted bicycle, for example, one disclosed in Patent Document 1 is known. In this electrically assisted bicycle, a pedal mechanism that converts a driver's stepping force (hereinafter referred to as “stepping force”) into rotational power and an assisting rotating machine are both connected to driving wheels via a differential device. . Specifically, this differential has a rotatable differential case that rotatably supports a first side gear and a second side gear having the same number of teeth and a pinion gear meshing with the first and second side gears. ing. The first and second side gears are connected to the pedal mechanism and the rotating machine, respectively, and the differential case is connected to the drive wheels. In the conventional electrically assisted bicycle having the above configuration, after assisting with the rotating machine, after the pedaling force transmitted to the first side gear via the pedal mechanism and the power of the rotating machine transmitted to the second side gear are combined, the differential case Is transmitted to the drive wheel via

  As described above, in the conventional electrically assisted bicycle, the pedaling force from the pedal mechanism and the power of the rotating machine are transmitted to the driving wheels through the differential device during assisting by the rotating device. The efficiency of the electrically assisted bicycle is lowered due to the transmission loss of power due to the meshing of gears and friction. In addition, since a differential device having a complicated mechanism in which a plurality of gears and shafts are combined must be used, the configuration of the electrically assisted bicycle becomes very complicated, and the size and weight also increase.

  The present invention has been made to solve the above-described problems, and provides an electric assist bicycle capable of improving efficiency and simplifying the configuration, reducing the size, and reducing the weight. With the goal.

Japanese Patent Laid-Open No. 7-300090

  In order to achieve the above object, the electrically assisted bicycles 1, 1 </ b> A to 1 </ b> G according to claim 1 have a pedal 4 and a crankshaft 5, and convert the force input to the pedal 4 into rotational power. Pedal mechanism 3 that outputs to, driving wheel (rear wheel 2 in the embodiment (hereinafter the same in this section)), stationary stator 23 for generating a rotating magnetic field, and a magnet, and opposed to stator 23 The first rotor 22 is provided so as to be configured, and the second rotor 24 is formed of a soft magnetic material and is provided between the stator 23 and the first rotor 22. The stator 23, the first rotor 22, The energy is input / output between the two rotors 24 via a magnetic circuit formed along with the generation of the rotating magnetic field, and the rotating magnetic field, the second and first rotors 24, 22 are input along with the energy input / output. But each other A rotating machine 20 configured to rotate while maintaining a predetermined collinear relationship between the rotation speeds, the first rotor 22 being connected to the crankshaft 5 and the second rotor 24 being connected to drive wheels; It is characterized by providing.

  According to this electrically assisted bicycle, energy is input / output between the stator and the first and second rotors via the magnetic circuit formed along with the generation of the rotating magnetic field in the stator. As the energy is input / output, the rotating magnetic field and the second and first rotors rotate while maintaining a predetermined collinear relationship of rotational speed between them. Such a linear velocity relationship between the rotating magnetic field and the first and second rotors corresponds to the relationship between the rotational speed of one of the sun gear and the ring gear of the planetary gear device and the carrier supporting the planetary gear. . Therefore, in the energy input / output relationship, the stator corresponds to one of the sun gear and the ring gear, the first rotor corresponds to the other, and the second rotor corresponds to the carrier.

  The first and second rotors having the power input / output relationship as described above are connected to the crankshaft and the drive wheels of the pedal mechanism, respectively. For this reason, when electric power is supplied to the stator and a force (hereinafter referred to as “stepping force”) is input to the first rotor via the pedal and the crankshaft, the electric power supplied to the stator is converted into power (hereinafter referred to as this power). As the power is transmitted to the second rotor via the magnetic circuit, the pedaling force input to the first rotor is also transmitted to the second rotor via the magnetic circuit. It is transmitted to the drive wheel. Thus, since the pedal effort from the crankshaft and the power conversion power from the stator can be transmitted to the drive wheels, the pedal effort can be assisted by the rotating machine.

  Further, as described above, during the assist by the rotating machine, the transmission of the treading force and the power conversion power to the drive wheels is performed by a so-called magnetic path by non-contact via the magnetic circuit, and therefore the transmission efficiency is It is higher than the case where it is performed via a differential device as in the above-described conventional electrically assisted bicycle. Further, since the rotating machine has a function of combining a power source and a planetary gear device, a planetary gear device, that is, a differential device for synthesizing the pedaling force and the power conversion power and transmitting it to the drive wheel is not required. As described above, the efficiency of the electrically assisted bicycle can be increased and the configuration of the electrically assisted bicycle can be simplified, reduced in size, and reduced in weight as compared with the above-described conventional case using the differential device.

  Further, as described above, during the energy input / output between the stator and the first and second rotors, the rotating magnetic field and the second and first rotors have a predetermined collinear relationship between the rotational speeds of each other. Rotate while keeping. For this reason, for example, during the assist, the rotational speed of the rotating magnetic field is controlled so that the rotational speed of the drive wheel connected to the second rotor is changed with respect to the crankshaft connected to the first rotor. It can be raised and lowered without steplessly.

  Further, from the input / output relationship of energy between the stator and the first and second rotors described above, for example, by performing a short circuit between the phases in the stator and inputting a pedaling force to the first rotor, the rotational speed of the rotating magnetic field is increased. The value is controlled to be substantially 0 (the magnetic field is generated in the stator but the rotation is hardly performed), so that this pedaling force (power) can be transmitted to the second rotor via the magnetic circuit, and , Can be transmitted to the drive wheel. In this way, the drive wheels can be driven only by the pedal effort without supplying electric power to the stator, that is, without assisting by a rotating machine. Hereinafter, traveling of an electrically assisted bicycle using only the pedaling force as a power source is referred to as “pedal traveling”. Further, as described above, even during pedal travel, the pedaling force is transmitted to the drive wheels by a magnetic path through the magnetic circuit, as in the case of assisting, so that the efficiency of the electrically assisted bicycle can be increased. Further, since the rotation speed of the rotating magnetic field is controlled to approximately 0 during the pedal running, the rotational resistance acting on the second rotor with the generation of the rotating magnetic field is extremely small, thus further improving the efficiency of the electrically assisted bicycle. be able to.

  In addition, when the second rotor is rotating in the idle running state of the electrically assisted bicycle, that is, when the pedaling force is not input to the crankshaft and the electrically assisted bicycle is running inertially, for example, Electric power is supplied to the stator, and the rotating magnetic field generated thereby is rotated in the rotating direction of the second rotor, and the rotational speed of the rotating magnetic field is controlled. As a result, the rotational speed of the first rotor connected to the crankshaft can be controlled to a value of 0, and the rotational resistance caused by the rotating magnetic field and the friction of the first rotor and the pedal mechanism act on the drive wheels via the second rotor. Can be prevented. Therefore, during idle running, the crankshaft can be held in a stopped state, and the running distance by idle running can be extended. This eliminates the need for a one-way clutch that normally connects / disconnects between the crankshaft and drive wheels provided on a power-assisted bicycle, thereby further simplifying, reducing size and weight of the power-assisted bicycle configuration. And cost can be reduced. Hereinafter, the control of the rotating machine for preventing the rotation resistance caused by the rotating magnetic field and the friction of the first rotor or the like from acting on the second rotor will be referred to as “zero torque control”.

  The invention according to claim 2 is the electric assist bicycle 1A, 1B according to claim 1, further comprising a clutch (first one-way clutch C1) for connecting / disconnecting between the second rotor 24 and the drive wheels. And

  According to this configuration, the second rotor and the drive wheel are connected / disconnected by the clutch. For this reason, for example, when the electrically assisted bicycle is idling, the crankshaft can be held in a stopped state by shutting off the second rotor and the drive wheels by a clutch, and the pedal mechanism friction and the stator are generated. Since it is possible to completely prevent the rotation resistance due to the rotating magnetic field and the friction of the first rotor from acting on the drive wheels, the travel distance due to idle running can be extended. Further, in this case, the zero torque control described in the operation of claim 1 is not necessary, and accordingly, for example, when assist is performed by supplying power of the power storage device to the stator, the zero torque control is not required. The electric power of the power storage device can be secured, and the travel distance by the assist can be extended.

  According to a third aspect of the present invention, in the electrically assisted bicycles 1A and 1B according to the second aspect, the clutch has a rotational speed on the drive wheel side (output portion C1b) and a rotational speed on the second rotor 24 side (input portion C1a). When it is higher, the one-way clutch (first one-way clutch C1) is configured to shut off the second rotor 24 and the drive wheels.

  According to this configuration, the one-way clutch blocks the connection between the second rotor and the drive wheels when the rotation speed on the drive wheel side of the one-way clutch is higher than the rotation speed on the second rotor side, and connects otherwise. The During idling, the pedaling force is not input to the crankshaft, and the rotational resistance of the rotating magnetic field and the friction of the first rotor act on the second rotor, so that the rotational speed of the second rotor decreases, and accordingly, the one-way clutch Since the rotation speed on the drive wheel side is higher than the rotation speed on the second rotor side, the above-described one-way clutch blocks the second rotor from the drive wheel. Thus, as in the electrically assisted bicycle according to claim 2, since the second rotor and the drive wheel can be shut off during idling, the crankshaft can be held in a stopped state and the running distance by idling can be extended. it can.

  Further, as described in the operation of claim 1, during driving and assisting the pedal, the driving wheel is driven only when power is transmitted from the second rotor, so that the rotational speed on the driving wheel side of the one-way clutch is increased. Is not higher than the rotation speed on the second rotor side. Therefore, during pedal travel and assist, the one-way clutch keeps the second rotor and the drive wheels in a connected state, so that pedaling force is applied during pedal travel, and pedaling force and power conversion power from the stator are being assisted. Both can be transmitted to the drive wheels.

  Furthermore, unlike a hydraulic clutch, the one-way clutch does not require an actuator to control its operation, so the configuration of an electric assist bicycle is simpler than when a hydraulic clutch is used. Can be reduced in size, size, and weight, and the cost of the electrically assisted bicycle can be reduced.

  According to a fourth aspect of the present invention, in the electrically assisted bicycles 1B and 1E according to the first aspect, the first power transmission system including the crankshaft 5 and the first rotor 22, the second rotor 24 and the second including the drive wheels. It is further characterized by further including clutches (second one-way clutch C2 and fourth one-way clutch C4) for connecting / disconnecting to / from the power transmission system.

  According to this configuration, the first power transmission system including the crankshaft and the first rotor and the second power transmission system including the second rotor and the drive wheels are connected and disconnected by the clutch. For this reason, for example, even when a magnetic circuit is not formed between the stator and the first and second rotors due to a failure of the stator, it is driven between the first power transmission system and the second power transmission system, that is, the crankshaft and the drive. By connecting the wheels with a clutch, the pedaling force input to the crankshaft can be transmitted to the drive wheels, and pedal travel can be performed. Further, by connecting the first power transmission system and the second power transmission system with a clutch, the pedal force input to the crankshaft can be applied to the drive wheel without performing the interphase short-circuit between the stators described in the operation of claim 1. Can be transmitted to the pedal, and pedal travel can be performed.

  According to a fifth aspect of the present invention, in the electrically assisted bicycles 1B and 1E according to the fourth aspect of the present invention, the clutch has a rotational speed of the second rotor 24 (second rotor rotational speed VR2) and a rotational speed of the first rotor 22 (first One-way clutches (second one-way clutch C2 and fourth one-way clutch C4) that shut off between the first rotor 22 and the second rotor 24 when the rotational speed is higher than one rotor rotational speed VR1).

  During pedal travel, as described in the operation of the first aspect, the second rotor connected to the drive wheel is driven only when pedaling force is transmitted from the first rotor connected to the crankshaft. For this reason, during pedal travel, the rotational speed of the second rotor does not become higher than the rotational speed of the first rotor. According to the above configuration, as long as the rotation speed of the second rotor to which the drive wheels are connected is not higher than the rotation speed of the first rotor to which the crankshaft is connected, the one-way clutch causes the first rotor and the second rotor to move. Since the gap is maintained in the connected state, the pedaling force input to the crankshaft can be transmitted to the drive wheels via the first rotor, the one-way clutch, and the second rotor during pedal travel. Therefore, as in the case of the electrically assisted bicycle according to the fourth aspect, even when the magnetic circuit is not formed due to the failure of the stator, the pedaling force input to the crankshaft can be transmitted to the drive wheels, and the pedal travel can be performed. Further, the pedaling force input to the crankshaft can be transmitted to the drive wheels without pedaling between the stators described in the operation of the first aspect, and pedal travel can be performed.

  Furthermore, in this case, when the rotational speed of the second rotor becomes higher than the rotational speed of the first rotor, the first rotor and the second rotor are blocked by the one-way clutch. Therefore, as described in the operation of the first aspect, during the assist, the rotation speed of the driving wheel connected to the second rotor is controlled by the control of the rotation speed of the rotating magnetic field with respect to the crankshaft connected to the first rotor. Thus, when the vehicle is raised steplessly without using the transmission, such speed increase of the drive wheels can be performed without any trouble.

  Further, since the one-way clutch is used as the clutch, the configuration of the electrically assisted bicycle can be simplified, reduced in size and reduced in weight, and the cost of the electrically assisted bicycle can be reduced as in the electrically assisted bicycle of claim 3.

  The invention according to claim 6 further includes a first clutch (third one-way clutch C3) for connecting / disconnecting between the crankshaft 5 and the first rotor 22 in the electrically assisted bicycles 1D and 1E according to claim 1. It is characterized by that.

  According to this configuration, the crankshaft and the first rotor are connected / disconnected by the clutch. For this reason, during idle running, the clutch is disconnected between the crankshaft and the first rotor, whereby the crankshaft and the second rotor and the drive wheels connected to the first rotor via a magnetic circuit are separated. Therefore, the crankshaft can be held in a stopped state. Further, for example, in the rotating machine, when the combined ratio of the power conversion power described in the operation of claim 1 and the power input to the first rotor is 1: 1, the rotation is performed in the zero torque control described above during idling. By controlling the rotational speed of the magnetic field to be the same as the rotational speed of the second rotor, it is possible to prevent the rotational resistance caused by the rotating magnetic field and the friction of the first rotor from acting on the drive wheels. On the other hand, when performing zero torque control while the crankshaft and the first rotor are connected to each other during idling, as described in the operation of claim 1, in order to keep the crankshaft in a stopped state, The rotational speed must be controlled so that the rotational speed of the first rotor is zero, and as a result, the rotational speed of the rotating magnetic field is higher than the rotational speed of the second rotor to which the drive wheels are connected. The electric power supplied to the stator for zero torque control increases.

  According to the above configuration, during the zero torque control, it is possible to control the rotational speed of the rotating magnetic field to be the same as the rotational speed of the second rotor by blocking the crankshaft and the first rotor by the clutch. Accordingly, it is possible to prevent the rotational resistance due to the rotating magnetic field and the friction of the first rotor from acting on the drive wheel, and zero torque control as compared with the case where the crankshaft and the first rotor are held in the connected state as described above. Power for use can be reduced. Further, by reducing the electric power for zero torque control, for example, in the case where the assist is performed by supplying the power of the power storage device to the stator, the travel distance by the assist can be extended.

  According to a seventh aspect of the present invention, in the electrically assisted bicycles 1D and 1E according to the sixth aspect of the present invention, the first clutch has a rotational speed on the first rotor 22 side (output portion C3b) of the crankshaft 5 side (input portion C3a). The first one-way clutch (third one-way clutch C3) is configured to block between the crankshaft 5 and the first rotor 22 when the rotational speed is higher than the first rotational speed.

  According to this configuration, the first one-way clutch shuts off between the crankshaft and the first rotor when the rotation speed on the first rotor side of the first one-way clutch is higher than the rotation speed on the crankshaft side. When connected, it is connected. If the crankshaft is held in a stopped state while the first rotor is rotating due to inertia during idling, the rotation speed on the first rotor side of the first one-way clutch becomes higher than the rotation speed on the crankshaft side. Thus, the crankshaft and the first rotor are blocked by the first one-way clutch. Therefore, similarly to the electrically assisted bicycle according to the sixth aspect, the crankshaft can be held in a stopped state during idling, and the electric power for zero torque control can be reduced.

  Also, as described in the operation of claim 1, during the pedal running and during the assist, the first rotor is driven only when power is transmitted from the crankshaft, so the first one-way clutch side of the first rotor Is not higher than the rotation speed on the crankshaft side. Accordingly, since the crankshaft and the first rotor are kept connected by the first one-way clutch during pedal travel and assist, the pedaling force can be transmitted to the drive wheel during pedal travel and assist.

  Furthermore, since the first one-way clutch is used as the first clutch, the configuration of the electric assist bicycle can be simplified, reduced in size and weight, and the cost of the electric assist bicycle can be reduced as in the electric assist bicycle according to claim 3. be able to.

  According to an eighth aspect of the present invention, in the electrically assisted bicycle 1E according to the sixth or seventh aspect, the first rotor 22 is connected to or disconnected from the power transmission system including the second rotor 24 and the drive wheels. It further includes a clutch (fourth one-way clutch C4) and a power storage device (battery 33) configured to be able to be charged and discharged and connected to the stator 23.

  As described in the operation of the first aspect, in the rotating machine, in terms of energy input / output, the stator corresponds to one of the sun gear and the ring gear, the first rotor corresponds to the other, and the second rotor corresponds to the carrier. Accordingly, when power is input to the second rotor and power is generated in the stator, the power (energy) input to the second rotor is distributed to the stator and the first rotor via the magnetic circuit. For this reason, in order to transmit the power of the second rotor as electric power to the stator, it is necessary to apply a load torque to the first rotor that prevents the first rotor from rotating in the rotation direction of the second rotor.

  According to the above-described configuration, the power storage device configured to be connected / disconnected between the first rotor and the power transmission system including the second rotor and the drive wheels and to be able to be charged / discharged by the second clutch. Is connected to the stator. For this reason, for example, during idle running, the power of the drive wheels can be used to generate power in the rotating machine, and the generated power can be charged to the power storage device. Specifically, during idling, the first clutch and the power transmission system including the second rotor and the drive wheels are connected by the second clutch so that both rotors rotate together with the drive wheels. Therefore, it is not necessary to apply the load torque described above to the first rotor, and the power transmitted from the drive wheels to the second and first rotors can be appropriately transmitted to the stator as electric power. In this way, during idle running, power can be generated in the stator using the power of the drive wheels, and thus the generated power can be charged to the power storage device, and by using the charged power for assist, The distance can be extended.

  Further, when the first clutch described above is provided, the crankshaft can be held in a stopped state by shutting off the crankshaft and the first rotor by the first clutch during power generation during idle running, and the pedal Friction caused by the mechanism can be prevented from acting on the second rotor via the first rotor, and accordingly, a larger amount of electric power can be charged in the power storage device.

  Further, even when the first one-way clutch described above is provided, the crankshaft and the first rotor are shut off during idling as described in the operation of claim 7, so that the crankshaft is held in a stopped state. In addition, it is possible to prevent the friction caused by the pedal mechanism from acting on the second rotor via the first rotor, and thus it is possible to charge the power storage device with a larger amount of electric power.

  Further, for example, even when a magnetic circuit is not formed between the stator and the first and second rotors due to a failure of the stator, there is a problem between the first rotor and the power transmission system, that is, between the crankshaft and the drive wheels. By connecting with two clutches, the pedaling force input to the crankshaft can be transmitted to the drive wheels and the pedal can be driven, as in the electrically assisted bicycle according to claim 4. Further, by connecting the first rotor and the power transmission system by the second clutch, the pedaling force input to the crankshaft is transmitted to the drive wheels without performing the inter-phase short circuit of the stator described in the operation of claim 1. Yes, you can pedal.

  According to the ninth aspect of the present invention, in the electrically assisted bicycle 1E according to the eighth aspect, the second clutch has a rotational speed of the second rotor 24 (second rotor rotational speed VR2) that is the rotational speed of the first rotor 22 (first rotational speed). It is a second one-way clutch (fourth one-way clutch C4) that shuts off the first rotor 22 and the second rotor 24 when the rotational speed is higher than one rotor rotational speed VR1).

  According to this configuration, the second one-way clutch blocks between the first rotor and the second rotor when the rotational speed of the second rotor is higher than that of the first rotor, and connects at other times. From the energy input / output relationship between the stator and the first and second rotors described above, the first rotor is moved in the rotational direction of the second rotor in accordance with the execution of power generation during idle running described in the operation of claim 8. The rotating torque acts on the first rotor, and as a result, the rotational speed of the first rotor increases. In this case, if the increased rotation speed of the first rotor becomes equal to the rotation speed of the second rotor, then as long as torque that rotates in the rotation direction of the second rotor along with power generation acts on the first rotor, The first rotor and the second rotor are connected by a second one-way clutch so that both rotors are integrated. Therefore, similarly to the electrically assisted bicycle according to claim 8, during idle running, the power of the driving wheel can be used to generate power in the stator, and thus the generated power can be charged to the power storage device and the charged power can be assisted. By using it, the travel distance by assist can be extended.

  Further, as described in the operation of claim 5, during the pedal running, the second rotor is driven only when the pedaling force is transmitted from the first rotor, and therefore the rotational speed of the second rotor is the first rotor. Therefore, the second one-way clutch maintains the connected state between the first rotor and the second rotor. Therefore, similarly to the electrically assisted bicycle according to claim 8, for example, even when a magnetic circuit is not formed between the stator and the first and second rotors due to a failure of the stator, the pedaling force input to the crankshaft is Via a 1st rotor, a 2nd one-way clutch, and a 2nd rotor, it can transmit to a driving wheel and can perform pedal travel. For the same reason, the pedaling force input to the crankshaft can be transmitted to the drive wheels without performing the interphase short circuit of the stator described in the operation of the first aspect, and the pedal travel can be performed.

  Further, during the assist, as described in the operation of the first aspect, by controlling the rotational speed of the rotating magnetic field, the rotational speed of the drive wheel connected to the second rotor is controlled with respect to the crankshaft connected to the first rotor. Thus, when the step-up is performed without using the transmission, the second one-way clutch blocks the first rotor and the second rotor, so that the drive wheels can be accelerated without any problem. Can do.

  In addition, since the second one-way clutch is used as the second clutch, the configuration of the electric assist bicycle can be simplified, reduced in size and reduced in weight, and the cost of the electric assist bicycle can be reduced as in the electric assist bicycle according to claim 3. can do.

  According to a tenth aspect of the present invention, in the electrically assisted bicycles 1F and 1G according to the first aspect, the rotational speed on the first rotor 22 side (output section C3b) is higher than the rotational speed on the crankshaft 5 side (input section C3a). Between the first one-way clutch (third one-way clutch C3) that shuts off the crankshaft 5 and the first rotor 22 when it is high, and between the crankshaft 5 and the power transmission system that includes the second rotor 24 and drive wheels. A second one-way that shuts off the crankshaft and the power transmission system when the rotational speed on the power transmission system side (output section C4b) is higher than the rotational speed on the crankshaft 5 side (input section C4a). And a clutch (fourth one-way clutch C4).

  According to this configuration, the first one-way clutch shuts off between the crankshaft and the first rotor when the rotation speed on the first rotor side of the first one-way clutch is higher than the rotation speed on the crankshaft side. When connected, it is connected. Further, the second one-way clutch causes the rotation speed on the power transmission system side of the second one-way clutch to be higher than the rotation speed on the crankshaft side between the crankshaft and the power transmission system including the second rotor and drive wheels. Sometimes it is blocked, otherwise it is connected.

  During pedal travel, the power transmission system including the second rotor and the drive wheels is driven for the first time when a pedaling force is input. Therefore, the rotational speed on the power transmission system side of the second one-way clutch is the rotational speed on the crankshaft side. No higher than. Therefore, during pedal travel, the second one-way clutch maintains the connected state between the crankshaft and the power transmission system including the drive wheels, so that the pedaling force input to the crankshaft can be converted into the second one-way clutch and the second It can be transmitted to the drive wheels via the rotor. Therefore, as in the case of the electrically assisted bicycle according to the fourth aspect, even when the magnetic circuit is not formed due to the failure of the stator, the pedaling force input to the crankshaft can be transmitted to the drive wheels, and the pedal travel can be performed. Further, the pedaling force input to the crankshaft can be transmitted to the drive wheels without pedaling between the stators described in the operation of the first aspect, and pedal travel can be performed.

  Further, from the input / output relationship of energy between the stator and the first and second rotors described above during pedal travel, the rotational resistance due to the rotating magnetic field generated as the second rotor rotates with the drive wheels is The first rotor acts on the first rotor to rotate in the rotational direction of the second rotor, and acts as a load on the second rotor and the drive wheels. Furthermore, the friction of the first rotor acts as a load on the second rotor. The rotational resistance caused by these rotating magnetic fields and the friction of the first rotor are combined at a predetermined combining ratio based on the above-described predetermined collinear relationship and then transmitted to the second rotor. Further, when the ratio of the rotational resistance due to the rotating magnetic field to the friction of the first rotor is larger than the above-mentioned predetermined combined ratio, if the first and second rotors are held in the connected state, the rotation due to such a large rotating magnetic field All the resistance acts on the second rotor, and as a result, the efficiency of the electrically assisted bicycle during pedal travel decreases.

  According to the above configuration, the first one-way clutch blocks between the crankshaft and the first rotor when the rotational speed on the first rotor side of the first one-way clutch is higher than the rotational speed on the crankshaft side. . As described above, the rotational resistance due to the rotating magnetic field acts on the first rotor so as to rotate the first rotor in the rotational direction of the second rotor. Accordingly, the rotational speed of the first rotor is applied to the crankshaft. The rotational speed of the connected second rotor is higher. As a result, the rotation speed on the first rotor side of the first one-way clutch becomes higher than the rotation speed on the crankshaft side, so that the crankshaft and the first rotor are disconnected, and accordingly, connected to the crankshaft. The second rotor and the first rotor are also blocked. Thus, unlike the case where the first and second rotors are held in the connected state as described above, only a part of the rotational resistance caused by the rotating magnetic field is applied to the first and second rotors, and the rotating by the rotating magnetic field is performed. Since all the resistance does not act on the second rotor, the efficiency of the electrically assisted bicycle during pedal running can be increased.

  In addition, during the assist, the torque from the stator causes the first rotor to rotate in the direction opposite to the rotation direction of the second rotor because of the energy input / output relationship between the stator and the first and second rotors. In addition, it acts on the first rotor. As a result, the rotation speed on the first rotor side of the first one-way clutch does not become higher than the rotation speed on the crankshaft side. As a result, the crankshaft and the first rotor are connected by the first one-way clutch. Therefore, the pedaling force is input to the first rotor. Therefore, as with the electrically assisted bicycle according to the first aspect, the pedaling force from the crankshaft and the power conversion power from the stator can be transmitted to the drive wheels in a combined state, so that the pedaling force can be assisted by the rotating machine. In this case as well, the efficiency of the electrically assisted bicycle can be increased, and the configuration of the electrically assisted bicycle can be simplified, reduced in size and reduced in weight as in the electrically assisted bicycle of claim 1.

  Further, as described in the operation of claim 1, during the assist, when the rotational speed of the driving wheel is increased steplessly with respect to the crankshaft without using the transmission, by controlling the rotational speed of the rotating magnetic field. Since the second one-way clutch cuts off the crankshaft and the power transmission system including the second rotor and the drive wheels, it is possible to increase the speed of the drive wheels without any trouble.

  Further, if the crankshaft is held in a stopped state while the first rotor is rotating due to inertia during idling, the rotation speed on the first rotor side of the first one-way clutch is higher than the rotation speed on the crankshaft side. Therefore, the first one-way clutch blocks the crankshaft and the first rotor. Further, since the rotational speed of the second one-way clutch on the power transmission system side is higher than the rotational speed on the crankshaft side, the second one-way clutch causes the crankshaft and the power transmission system including the second rotor and drive wheels to be connected. Is cut off. Thus, during idle running, the crankshaft and the driving wheel are interrupted, so that the crankshaft can be held in a stopped state and the crankshaft and the first rotor are interrupted. Similar to the case of the assist bicycle, the power for zero torque control can be reduced as compared with the case where the crankshaft and the first rotor are held in the connected state.

  According to an eleventh aspect of the present invention, in the electrically assisted bicycles 1A to 1G according to any one of the first to tenth aspects, the second rotor 24 does not use the speed increasing mechanism 6 that increases the speed and transmits the power. It is connected to a driving wheel.

  When the second rotor is connected to the driving wheel via the speed increasing mechanism, the torque transmitted from the second rotor to the driving wheel is reduced by the speed increasing by the speed increasing mechanism, and accordingly, from the crankshaft. Since the torque transmitted to the first and second rotors increases, the torque required for the rotating machine increases. On the other hand, according to the above-described configuration, the second rotor is connected to the drive wheels without using the speed increasing mechanism, so compared to the case where this connection is performed using the speed increasing mechanism, Since the torque transmitted from the crankshaft to the first and second rotors is reduced and the torque required for the rotating machine is reduced, the rotating machine can be reduced in size.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a power-assisted bicycle 1 according to a first embodiment of the present invention. The electric assist bicycle 1 is a two-wheeled bicycle, and includes a rear wheel 2 (drive wheel), a pedal mechanism 3, a speed increasing mechanism 6, a transmission 10, and a rotating machine 20, as shown in FIG. . FIG. 1 mainly shows a characteristic part of the present invention. The electrically assisted bicycle 1 further includes a front wheel, a handle, a saddle, a brake, and a frame (all not shown) provided with these front wheels. Of course, it is necessary to prepare. These elements are the same as the conventional ones, and detailed description thereof is omitted.

  The rear wheel 2 is attached to the rear end portion of the frame via an axle 1a and a bearing (not shown), and is thereby rotatable about an axis extending in the horizontal direction.

  The pedal mechanism 3 converts a stepping force of a driver's foot (hereinafter referred to as “stepping force”) into rotational power, and includes a pedal 4 and a crankshaft 5. The crankshaft 5 includes a shaft-like crank journal 5a extending in the horizontal direction, and crank arms 5b and 5b that are fixed to both ends of the crank journal 5a and are orthogonal to the crank journal 5a. The crank journal 5a is supported by a bearing (not shown) attached to the lower end of the center of the frame, so that the crankshaft 5 is rotatable about an axis extending in the horizontal direction. A pedal 4 is attached to each crank arm 5b at the end opposite to the crank journal 5a. The pedal 4 is orthogonal to the crank arm 5b and is rotatable about an axis extending in the horizontal direction with respect to the crank arm 5b. With the above configuration, in the pedal mechanism 3, when the pedaling force of the driver is input to the pedal 4, the pedaling force is transmitted to the crankshaft 5 and output to the crank journal 5a in a state converted into rotational power. Is done.

  The rotating machine 20 is for assisting the driver's pedaling force, and is provided integrally with the pedal mechanism 3 at the lower end of the center of the frame. As shown in FIGS. 1 and 2, the rotating machine 20 is opposed to the case CA integrated with the frame, the rotary shaft 21 rotatably supported by the case CA, the first rotor 22, and the first rotor 22. And a second rotor 24 that is provided with a predetermined space between the two rotors 22 and 23 and connected to the rotary shaft 21. The first rotor 22, the second rotor 24, and the stator 23 are arranged in this order from the inside in the radial direction. In the following description, the left side of FIG. 2 is assumed to be “left” and the right side is assumed to be “right”.

  The first rotor 22 has 2n permanent magnets 22a, and these permanent magnets 22a are equally spaced in the circumferential direction of the crank journal 5a of the pedal mechanism 3 described above (hereinafter simply referred to as “circumferential direction”). Are attached to the outer peripheral surface of the ring-shaped fixing portion 22b. Each permanent magnet 22a has a substantially fan-shaped cross section perpendicular to the axial direction of the crank journal 5a (hereinafter simply referred to as the “axial direction”), and extends slightly in the axial direction. The fixing portion 22b is made of a soft magnetic material such as iron, and its inner peripheral surface is attached to the outer peripheral surface of the disk-shaped flange 22c. The flange 22c is provided concentrically and integrally with the crank journal 5a. With the above configuration, the permanent magnet 22a can rotate integrally with the crank journal 5a. In other words, the first rotor 22 can rotate together with the crankshaft 5.

  As shown in FIG. 3, the center angle formed by each of the two permanent magnets 22a adjacent to each other in the circumferential direction with the crank journal 5a as the center is a predetermined angle θ. The polarities of the permanent magnets 22a are different from each other for each two adjacent in the circumferential direction. Hereinafter, the left and right magnetic poles of the permanent magnet 22a are referred to as “first magnetic pole” and “second magnetic pole”, respectively.

  The stator 23 generates a rotating magnetic field, and has 3n armatures 23a arranged at equal intervals in the circumferential direction. Each armature 23a includes an iron core 23b and a coil 23c wound around the iron core 23b. The iron core 23b has a substantially fan-shaped cross section perpendicular to the axial direction, and has substantially the same length as the permanent magnet 22a in the axial direction. A groove 23d extending in the circumferential direction is formed in the central portion of the inner peripheral surface of the iron core 23b in the axial direction. The 3n coils 23c constitute n sets of U-phase, V-phase, and W-phase three-phase coils (see FIG. 3). Further, the armature 23a is attached to the case CA via a ring-shaped fixing portion 23e and cannot move. From the number and arrangement of armatures 23a and permanent magnets 22a as described above, when the center of one armature 23a coincides with the center of the permanent magnet 22a in the circumferential direction, every two armatures 23a are arranged with respect to the armature 23a. The center of the armature 23a and the center of every other permanent magnet 22a with respect to the permanent magnet 22a coincide with each other in the circumferential direction.

  Further, the armature 23 a is connected to the ECU 31 and the battery 33 via a power drive unit (hereinafter referred to as “PDU”) 32. The ECU 31 is configured by a microcomputer including an I / O interface, CPU, RAM, and ROM, and the PDU 32 is configured by an electric circuit such as an inverter. The battery 33 is configured to be able to be charged and discharged. The armature 23a is configured such that magnetic poles having different polarities are generated at the left and right ends of the iron core 23b when electric power is supplied from the battery 33 or when power is generated as described later. Has been. Further, with the generation of these magnetic poles, the first and second rotations between the left side (first magnetic pole side) portion and the right side (second magnetic pole side) portion of the first rotor 22. Each magnetic field is generated so as to rotate in the circumferential direction. Hereinafter, the magnetic poles generated at the left and right ends of the iron core 23b are referred to as “first armature magnetic pole” and “second armature magnetic pole”, respectively. The number of the first and second armature magnetic poles is the same as the number of magnetic poles of the permanent magnet 22a, that is, 2n.

  The second rotor 24 has a plurality of first cores 24a and second cores 24b. The first and second cores 24a and 24b are arranged at equal intervals in the circumferential direction, and the number of both the 24a and 24b is the same as that of the permanent magnet 22a, that is, 2n. Each of the first cores 24a is formed by stacking a soft magnetic material, for example, a plurality of steel plates, and has a substantially fan-shaped cross section orthogonal to the axial direction, and extends in the axial direction with a length approximately half that of the permanent magnet 22a. ing. Each of the second cores 24b is formed by laminating a plurality of steel plates, like the first core 24a. The cross section perpendicular to the axial direction has a substantially fan shape, and is approximately half the length of the permanent magnet 22a in the axial direction. It extends in.

  In the axial direction, the first core 24a is disposed between the left side (first magnetic pole side) portion of the first rotor 22 and the left side (first armature magnetic pole side) portion of the stator 23, and the second The core 24b is disposed between a portion on the right side (second magnetic pole side) of the first rotor 22 and a portion on the right side (second armature magnetic pole side) of the stator 23. Further, the second cores 24b are alternately arranged in the circumferential direction with respect to the first cores 24a, and the centers thereof are shifted from the center of the first cores 24a by ½ of the predetermined angle θ described above. Yes.

  The first and second cores 24a and 24b are attached to the outer end portion of the donut plate-like flange 24c via rod-like connecting portions 24d and 24e that extend slightly in the axial direction, respectively. The flange 24c is provided concentrically and integrally with the rotary shaft 21 described above. With this configuration, the first and second cores 24 a and 24 b can rotate together with the rotating shaft 21. Moreover, the rotating shaft 21 is formed in a hollow shape, and a crank journal 5a is fitted into the inner side of the rotating shaft 21 so as to be rotatable concentrically.

  In the rotating machine 20 configured as described above, as shown in FIG. 3, during the generation of the first and second rotating magnetic fields, the polarity of each first armature magnetic pole is opposite (closest) to each first magnetic pole. When different from the polarity, the polarity of each second armature magnetic pole is the same as the polarity of each second magnetic pole facing (closest) to it. Further, when each first core 24a is positioned between each first magnetic pole and each first armature magnetic pole, each second core 24b has two sets of second armature magnetic poles adjacent in the circumferential direction. And the second magnetic pole. Further, although not shown, when the first and second rotating magnetic fields are generated, when the polarity of each second armature magnetic pole is different from the polarity of each second magnetic pole facing (closest), each first armature The polarity of the magnetic pole is the same as the polarity of each first magnetic pole facing (closest). Further, when each second core 24b is positioned between each second magnetic pole and each second armature magnetic pole, each first core 24a has two sets of first armature magnetic poles adjacent in the circumferential direction. And between the first magnetic poles.

  The rotating machine 20 can be regarded as a planetary gear device that inputs and outputs rotational power with two members and inputs and outputs power with one member. Hereinafter, this point will be described based on the operation of the rotating machine 20. In FIG. 3 described above, the armature 23a and the fixing portion 23e are shown as being divided into two parts because they are shown as development views. However, since these are actually one, FIG. The configuration can be shown as equivalent to that in FIG. Therefore, hereinafter, the operation of the rotating machine 20 will be described on the assumption that the permanent magnet 22a, the armature 23a, and the first and second cores 24a and 24b are arranged as shown in FIG.

  In addition, for the convenience of explanation, the operation of the first and second rotating magnetic fields is equivalent to 2n virtual permanent magnets (hereinafter referred to as “virtual magnets”) VM equivalent to the permanent magnets 22a. It will be described in terms of physical movement. Further, the left (first magnetic pole side) and right (second magnetic pole) magnetic poles of the virtual magnet VM are used as first and second armature magnetic poles on the left side (first magnetic pole side) of the first rotor 22, respectively. The rotating magnetic field generated between each part and the right side (second magnetic pole side) part will be described as the first and second rotating magnetic fields. Furthermore, the left part and the right part of the permanent magnet 22a are hereinafter referred to as “first magnet part” and “second magnet part”, respectively.

  First, as an operation of the rotating machine 20, an operation in the case where the first and second rotating magnetic fields are generated by supplying power to the armature 23a in a state where the first rotor 22 is made non-rotatable will be described.

  As shown in FIG. 5 (a), each first core 24a is opposed to each first magnet part, and each second core 24b is positioned between each two adjacent second magnet parts. The first and second rotating magnetic fields are generated to rotate downward in the figure. At the start of the occurrence, the polarity of each first armature magnetic pole is made different from the polarity of each first magnetic pole opposed thereto, and the polarity of each second armature magnetic pole is changed to the polarity of each second magnetic pole opposed thereto. Same as.

  Since the first core 24a is arranged as described above, the first core 24a is magnetized by the first magnetic pole and the first armature magnetic pole, and between the first magnetic pole, the first core 24a and the first armature magnetic pole, G1 (hereinafter referred to as “first magnetic field line”) is generated. Similarly, since the second core 24b is arranged as described above, the second core 24b is magnetized by the second armature magnetic pole and the second magnetic pole, and between the second armature magnetic pole, the second core 24b and the second magnetic pole. In addition, magnetic field lines (hereinafter referred to as “second magnetic field lines”) G2 are generated.

  In the state shown in FIG. 5A, the first magnetic field lines G1 are generated so as to connect the first magnetic pole, the first core 24a, and the first armature magnetic poles, and the second magnetic field lines G2 are adjacent to each other in the circumferential direction. So as to connect two second armature magnetic poles and the second core 24b positioned between them, and to connect each of the two second magnetic poles adjacent to each other in the circumferential direction and the second core 24b positioned between them. appear. As a result, in this state, a magnetic circuit as shown in FIG. In this state, since the first magnetic force line G1 is linear, no magnetic force that rotates in the circumferential direction acts on the first core 24a. Further, the bending degree and the total magnetic flux amount of the two second magnetic field lines G2 between the two second armature magnetic poles adjacent to each other in the circumferential direction and the second core 24b are equal to each other. The degree of bending and the total amount of magnetic flux of the two second magnetic lines of force G2 between the two second magnetic poles and the second core 24b are also equal and balanced. For this reason, the magnetic force which rotates in the circumferential direction does not act also on the 2nd core 24b.

  When the virtual magnet VM is rotated from the position shown in FIG. 5A to the position shown in FIG. 5B, a second magnetic field line G2 connecting the second armature magnetic pole, the second core 24b, and the second magnetic pole is generated. As it occurs, the first magnetic field line G1 between the first core 24a and the first armature magnetic pole is bent. Accordingly, a magnetic circuit as shown in FIG. 7B is configured by the first and second magnetic lines of force G1, G2.

  In this state, although the degree of bending of the first magnetic field lines G1 is small, the total magnetic flux amount is large, so that a relatively strong magnetic force acts on the first core 24a. Thereby, the first core 24a is driven with a relatively large driving force in the rotation direction of the virtual magnet VM, that is, the rotation direction of the first and second rotating magnetic fields (hereinafter referred to as “magnetic field rotating direction”). As a result, the second rotor 24 rotates in the magnetic field rotation direction. In addition, although the degree of bending of the second magnetic field lines G2 is large, the total magnetic flux amount is small, so that a relatively weak magnetic force acts on the second core 24b, whereby the second core 24b is relatively small in the magnetic field rotation direction. Driven by the driving force, as a result, the second rotor 24 rotates in the magnetic field rotation direction.

  Next, when the virtual magnet VM sequentially rotates from the position shown in FIG. 5B to the positions shown in FIGS. 5C and 5D and FIGS. 6A and 6B, the first and second The cores 24a and 24b are respectively driven in the magnetic field rotation direction by the magnetic force generated by the first and second magnetic lines G1 and G2, and as a result, the second rotor 24 rotates in the magnetic field rotation direction. Meanwhile, the magnetic force acting on the first core 24a is gradually weakened by decreasing the total magnetic flux amount, although the bending degree of the first magnetic field line G1 is increased, and drives the first core 24a in the magnetic field rotation direction. The driving force gradually decreases. In addition, the magnetic force acting on the second core 24b is gradually increased as the total magnetic flux amount is increased, although the degree of bending of the second magnetic field line G2 is reduced, and drives the second core 24b in the magnetic field rotation direction. The driving force gradually increases.

  Then, while the virtual magnet VM rotates from the position shown in FIG. 6B to the position shown in FIG. 6C, the second magnetic field line G2 is bent and the total magnetic flux amount is close to the maximum. As a result, the strongest magnetic force acts on the second core 24b, and the driving force acting on the second core 24b is maximized. Thereafter, as shown in FIG. 6C, when the virtual magnet VM moves to a position facing the first and second magnet portions, the first armature magnetic pole and the first magnetic pole facing each other have the same polarity. The first core 24a is positioned between two sets of the first armature magnetic pole and the first magnetic pole having the same polarity adjacent to each other in the circumferential direction. In this state, although the degree of bending of the first magnetic field lines G1 is large, the magnetic force that rotates in the direction of rotating the magnetic field does not act on the first core 24a because the total magnetic flux amount is small. Further, the second armature magnetic pole and the second magnetic pole facing each other have different polarities.

  When the virtual magnet VM further rotates from this state, the first and second cores 24a and 24b are driven in the magnetic field rotation direction by the magnetic force generated by the first and second magnetic lines G1 and G2, and the second rotor 24 is magnetically moved. Rotate in the direction of rotation. At that time, while the virtual magnet VM is rotated to the position shown in FIG. 5A, the magnetic force acting on the first core 24a is contrary to the above, although the degree of bending of the first magnetic field line G1 is small. The driving force acting on the first core 24a increases as the amount of magnetic flux increases. On the contrary, the magnetic force acting on the second core 24b is weakened by decreasing the total magnetic flux amount, although the bending degree of the second magnetic field line G2 is increased, and the driving force acting on the second core 24b is reduced.

  As described above, with the rotation of the virtual magnet VM, that is, the rotation of the first and second rotating magnetic fields, the driving forces acting on the first and second cores 24a and 24b are alternately increased or decreased. The second rotor 24 rotates in the magnetic field rotation direction while repeating the state of becoming. In this case, assuming that torques transmitted through the first and second cores 24a and 24b are T24a and T24b, torque transmitted to the second rotor 24 (hereinafter referred to as “second rotor transmission torque”) TR2, The relationship between these two torques T24a and T24b is generally as shown in FIG. As shown in the figure, the two torques T24a and T24b change in a substantially sine wave shape with the same cycle, and the phases are shifted from each other by a half cycle. Since the first and second cores 24a and 24b are connected to the second rotor 24, the second rotor transmission torque TR2 is the sum of the two torques T24a and T24b that change as described above. It becomes almost constant.

The first core 24a is positioned between the first magnetic pole connected by the first magnetic field line G1 and the first armature magnetic pole by the action of the magnetic force by the first and second magnetic field lines G1, G2, and The second rotor 24 rotates while maintaining the state where the two cores 24b are positioned between the second magnetic pole and the second armature magnetic pole connected by the second magnetic field line G2. For this reason, the rotation speed (hereinafter referred to as “magnetic field rotation speed”) V0 of the first and second rotating magnetic fields, the rotation speed of the first rotor 22 (hereinafter referred to as “first rotor rotation speed”) VR1, and the second rotor. Generally, the following equation (1) is established between the rotational speed of 24 (hereinafter referred to as “second rotor rotational speed”) VR2.
VR2 = (V0 + VR1) / 2 (1)
Further, when the equation (1) is modified, the following equation (2) is obtained.
V0−VR2 = VR2−VR1 (2)
As is clear from these equations (1) and (2), the second rotor rotational speed VR2 is equal to the average speed of the magnetic field rotational speed V0 and the first rotor rotational speed VR1, in other words, the magnetic field rotational speed V0. And the second rotor rotational speed VR2 is equal to the difference between the second rotor rotational speed VR2 and the first rotor rotational speed VR1. Thus, the magnetic field rotation speed V0 and the first and second rotor rotation speeds VR1 and VR2 are in a collinear relationship.

  Therefore, when the above-described first rotor rotational speed VR1 is 0, VR2 = V0 / 2 is established, and the relationship between the magnetic field rotational speed V0 and the first and second rotor rotational speeds VR1 and VR2 is, for example, As shown in FIG. 9 (a).

In this case, since the second rotor rotational speed VR2 is decelerated to 1/2 of the magnetic field rotational speed V0, the second rotor transmission torque TR2 is equivalent to the power supplied to the stator 23 and the magnetic field rotational speed V0. Is equivalent to the driving equivalent torque TSE. That is, the following expression (3) is established.
TR2 = TSE 2 (3)
As described above, when electric power is supplied to the stator 23 with the first rotor 22 being unrotatable, all of this electric power is transmitted to the second rotor 24 as power.

  Next, the operation in the case where the first and second rotating magnetic fields are generated by supplying power to the armature 23a in a state where the second rotor 24 is made non-rotatable will be described.

  Also in this case, as shown in FIG. 11A, each first core 24a is opposed to each first magnet portion, and each second core 24b is positioned between each two adjacent second magnet portions. In this state, the first and second rotating magnetic fields are generated to rotate downward in the figure. At the start of the occurrence, the polarity of each first armature magnetic pole is made different from the polarity of each first magnetic pole opposed thereto, and the polarity of each second armature magnetic pole is changed to the polarity of each second magnetic pole opposed thereto. Same as. In this state, the magnetic circuit as shown in FIG.

  When the virtual magnet VM is rotated from the position shown in FIG. 11A to the position shown in FIG. 11B, the first magnetic field line G1 between the first core 24a and the first armature magnetic pole is bent. Accordingly, when the second armature magnetic pole approaches the second core 24b, a second magnetic field line G2 that connects the second armature magnetic pole, the second core 24b, and the second magnetic pole is generated. As a result, a magnetic circuit as shown in FIG.

  In this state, although the total magnetic flux amount of the first magnetic line of force G1 between the first magnetic pole and the first core 24a is large, the first magnetic line of force G1 is straight, so the first magnet part is attached to the first core 24a. There is no magnetic force to rotate. In addition, since the distance between the second magnetic pole and the second armature magnetic pole having a different polarity is relatively long, the total magnetic flux amount of the second magnetic field line G2 between the second core 24b and the second magnetic pole is relatively small. However, when the degree of bending is large, a magnetic force is applied to the second magnet portion so as to bring it closer to the second core 24b. Accordingly, the permanent magnet 22a is driven in the direction of rotation of the virtual magnet VM, that is, the direction opposite to the direction of rotation of the magnetic field (upward in FIG. 11), and rotates toward the position shown in FIG. Accordingly, the first rotor 22 rotates in the direction opposite to the magnetic field rotation direction.

  And while the permanent magnet 22a rotates toward the position shown in FIG.11 (c) from the position shown in FIG.11 (b), virtual magnet VM rotates toward the position shown in FIG.11 (d). As described above, when the second magnet portion approaches the second core 24b, the degree of bending of the second magnetic line of force G2 between the second core 24b and the second magnetic pole is reduced, but the virtual magnet VM becomes the second core 24b. As the value further approaches, the total magnetic flux amount of the second magnetic field lines G2 increases. As a result, also in this case, a magnetic force is applied to the second magnet portion so as to bring the second magnet portion closer to the second core 24b, thereby driving the permanent magnet 22a in the direction opposite to the magnetic field rotation direction.

  In addition, as the permanent magnet 22a rotates in the direction opposite to the magnetic field rotation direction, the first magnetic line of force G1 between the first magnetic pole and the first core 24a is bent, so that the first magnet portion is turned into the first core. A magnetic force acting close to 24a acts. However, in this state, the magnetic force generated by the first magnetic field line G1 is weaker than the magnetic force generated by the second magnetic field line G2 because the degree of bending of the first magnetic field line G1 is smaller than that of the second magnetic field line G2. As a result, the permanent magnet 22a is driven in the direction opposite to the magnetic field rotation direction by the magnetic force corresponding to the difference between the two magnetic forces.

  As shown in FIG. 11D, when the distance between the first magnetic pole and the first core 24a and the distance between the second core 24b and the second magnetic pole are substantially equal to each other, The total magnetic flux amount and the degree of bending of the first magnetic field lines G1 between the first cores 24a are substantially equal to the total magnetic flux amount and the degree of bending of the second magnetic field lines G2 between the second core 24b and the second magnetic pole, respectively. As a result, the magnetic forces generated by the first and second magnetic force lines G1 and G2 are substantially balanced with each other, whereby the permanent magnet 22a is temporarily not driven.

  From this state, when the virtual magnet VM rotates to the position shown in FIG. 12A, the state of generation of the first magnetic lines of force G1 changes, and a magnetic circuit as shown in FIG. 12B is configured. As a result, the magnetic force due to the first magnetic field line G1 hardly acts so as to bring the first magnet part closer to the first core 24a, so that the permanent magnet 22a is shown in FIG. 12C by the magnetic force due to the second magnetic field line G2. Driven to the position in the opposite direction of the magnetic field rotation direction.

  Then, when the virtual magnet VM is slightly rotated from the position shown in FIG. 12 (c), on the contrary, the magnetic force generated by the first magnetic field line G1 between the first magnetic pole and the first core 24a is changed to the first magnet portion. The permanent magnet 22a is driven in the direction opposite to the magnetic field rotation direction, and the first rotor 22 rotates in the direction opposite to the magnetic field rotation direction. When the virtual magnet VM further rotates, it corresponds to the difference between the magnetic force due to the first magnetic field line G1 between the first magnetic pole and the first core 24a and the magnetic force due to the second magnetic field line G2 between the second core 24b and the second magnetic pole. The permanent magnet 22a is driven in the direction opposite to the magnetic field rotation direction by the magnetic force. Thereafter, when the magnetic force due to the second magnetic field line G2 hardly acts to bring the second magnet part closer to the second core 24b, the permanent magnet 22a is driven in the direction opposite to the magnetic field rotation direction by the magnetic force due to the first magnetic field line G1. The

  As described above, with the rotation of the first and second rotating magnetic fields, the magnetic force generated by the first magnetic field line G1 between the first magnetic pole and the first core 24a and the second magnetic force between the second core 24b and the second magnetic pole. The magnetic force generated by the magnetic field line G2 and the magnetic force corresponding to the difference between these magnetic forces act alternately on the permanent magnet 22a, that is, on the first rotor 22, whereby the first rotor 22 rotates in the direction opposite to the magnetic field rotation direction. To do. Further, when the magnetic force, that is, the driving force acts alternately on the first rotor 22 as described above, the torque (hereinafter referred to as “first rotor transmission torque”) TR1 transmitted to the first rotor 22 becomes substantially constant.

Further, the relationship between the magnetic field rotation speed V0 and the first and second rotor rotation speeds VR1 and VR2 at this time is expressed as VR1 = −V0 by setting VR2 = 0 in the equation (1). It is shown as in FIG. Thus, the first rotor 22 rotates in the opposite direction at the same speed as the first and second rotating magnetic fields. Further, in this case, the first rotor transmission torque TR1 is equal to the driving equivalent torque TSE, and the following expression (4) is established.
TR1 = TSE (4)

Further, when the magnetic field rotation speed V0 and the first and second rotor rotation speeds VR1 and VR2 are not zero, for example, the first and second rotation magnetic fields are obtained in a state where the first rotor 22 is rotated by power. Is generated, the aforementioned general formula (1) is established as it is between the magnetic field rotational speed V0 and the first and second rotor rotational speeds VR1 and VR2, and the speed relationship between the three is, for example, As shown in FIG. 10 (a). In this case, the first rotor transmission torque TR1 and the driving equivalent torque TSE are combined and transmitted to the second rotor 24 via the magnetic force generated by the first and second magnetic force lines G1 and G2, that is, the magnetic circuit. That is, the following equation (5) is established.
TR2 = TSE + TR1 (5)
However, in this case, as shown in the equation (2), the difference between the magnetic field rotation speed V0 and the second rotor rotation speed VR2 and the difference between the second rotor rotation speed VR2 and the first rotor rotation speed VR1 are Therefore, the torque synthesis ratio of the driving equivalent torque TSE and the first rotor transmission torque TR1 is 1: 1. Therefore, the power transmitted from the stator 23 to the second rotor 24 (hereinafter referred to as “power conversion power”) and the power transmitted from the first rotor 22 to the second rotor 24 as power is supplied to the stator 23. Is equal to the ratio between the magnetic field rotational speed V0 and the first rotor rotational speed VR1.

  Further, when the second rotor 24 is rotated by power, and the three-phase coil 23c of the stator 23 is connected to each other by a short circuit between the phases, the first and second rotations generated as the second rotor 24 rotates. The magnetic field rotation speed V0 of the magnetic field becomes substantially zero, and as a result, the power (energy) input to the second rotor 24 is not transmitted to the stator 23, and the magnetic force generated by the first and second magnetic lines G1, G2 is not transmitted. That is, it is all transmitted to the first rotor 22 via the magnetic circuit. Similarly, when the first rotor 22 is rotated by power and the magnetic field rotation speed V0 is controlled to a value of 0, the power (energy) input to the first rotor 22 is not transmitted to the stator 23, All are transmitted to the second rotor 24 via the magnetic force generated by the first and second magnetic lines G1 and G2.

Further, the relationship between the magnetic field rotation speed V0 and the first and second rotor rotation speeds VR1 and VR2 at this time is expressed by VR1 = 2 · VR2 by setting V0 = 0 in the equation (1). This is shown in FIG. 10 (b). Further, the following equation (6) is established between the first and second rotor transmission torques TR1 and TR2.
TR1 = TR2 / 2 (6)

  Further, in the rotating machine 20, even when power is not supplied to the stator 23, the permanent magnet 22 a is rotated by the input of power to the first rotor 22 with respect to the armature 23 a or the second rotor 24. When the first and second cores 24a and 24b are rotated by the input of power to the armature 23a, an induced electromotive force is generated and power generation is performed. When the first and second rotating magnetic fields are generated along with this power generation, the expressions (1) and (2) are established, and the expressions (3) to (5) are satisfied. A torque relationship is established.

Therefore, for example, when power is input to the second rotor 24 and power is generated by the stator 23 using a part of this power, the first rotor 22, the second rotor 24, the first and second rotors are used. When the rotating direction of the rotating magnetic field is the same, assuming that the electric power generated by the stator 23 and the torque equivalent to the magnetic field rotation speed V0 are the generating equivalent torque TGE, the generating equivalent torque TGE and the first and second The following equation (7) is established between the rotor transmission torques TR1 and TR2.
TR2 = TGE + TR1 (7)
In this case, as is apparent from the equation (7), the second rotor transmission torque TR2 is divided, and the power generation equivalent torque TGE and the first rotor transmission are transmitted via the magnetic forces generated by the first and second magnetic lines G1 and G2. Output as torque TR1. Further, as shown in the equation (2), the difference between the magnetic field rotational speed V0 and the second rotor rotational speed VR2 and the difference between the second rotor rotational speed VR2 and the first rotor rotational speed VR1 are equal to each other. In this case, the torque distribution ratio is 1: 1. Accordingly, the energy (power / power) distribution ratio is equal to the ratio between the magnetic field rotational speed V0 and the first rotor rotational speed VR1.

  The relationship between the rotational speed as expressed by the equation (1) between the stator 23 and the first and second rotors 22 and 24 and FIG. 9 and the equations (3) to (7). Such a torque relationship corresponds to a rotational speed relationship and a torque relationship of one of the sun gear and the ring gear of the planetary gear device, and the carrier supporting the planetary gear, respectively. Furthermore, since such a relationship between the rotational speed and the torque is obtained not only when power is supplied to the stator 23 but also during power generation, the rotating machine 20 inputs and outputs rotational power with two members, It can be regarded as a planetary gear device that inputs and outputs power with one member. Further, as described above, the input / output of energy between the stator 23 and the first and second rotors 22 and 24 in this case is different from the planetary gear device, and is not the gear but the first and second magnetic field lines. It is performed by a so-called magnetic path by magnetic force by G1, G2, that is, non-contact through a magnetic circuit.

  The rotational angular positions of the first and second rotors 22 and 24 with respect to the stator 23 are detected by a first angular position sensor 41 and a second angular position sensor 42, respectively, and these detection signals are output to the ECU 31. . The ECU 31 controls the PDU 32 on the basis of these detection signals, whereby the electric power supplied to the stator 23, the electric power generated by the stator 23, and the first and the first generated along with the electric power supply and power generation The magnetic field rotational speed V0 of the second rotating magnetic field is controlled. Further, the ECU 31 calculates the first and second rotor rotational speeds VR1 and VR2 based on the detected rotational angle positions of the first and second rotors 22 and 24, respectively.

  The speed increasing mechanism 6 described above has a first sprocket 7 and a second sprocket 8, and a chain 9 wound around these first and second sprockets 7 and 8. The number of teeth of the first sprocket 7 is larger than that of the second sprocket 8, whereby the power input to the first sprocket 7 is transmitted to the second sprocket 8 in an accelerated state. Further, the first sprocket 7 is fixed concentrically to the rotating shaft 21 of the rotating machine 20, so that it can rotate integrally with the rotating shaft 21.

  The transmission 10 is a so-called interior type constituted by a planetary gear device or the like, and has an input shaft 10a and an output shaft 10b, and has three shift stages. The power input to the input shaft 10a is shifted at one gear ratio of these three shift speeds and then output to the output shaft 10b. These input shaft 10a and output shaft 10b are concentrically fixed to the second sprocket 8 and the rear wheel 2, respectively, so that they can rotate together with the second sprocket 8 and the rear wheel 2. Further, the gear position of the transmission 10 is switched according to the operation of a lever (not shown) by the driver, and is detected by the gear position sensor 43, and the detection signal is output to the ECU 31.

  With the above configuration, the second rotor 24 of the rotating machine 20 is connected to the rear wheel 2 via the rotating shaft 21, the speed increasing mechanism 6, and the transmission 10. Further, as described above, the first rotor 22 is directly connected to the crankshaft 5 of the pedal mechanism 3.

  Next, the operation of the electrically assisted bicycle 1 will be described. First, an operation in the case where the electrically assisted bicycle 1 is driven using only the driver's pedaling force input to the pedal 4 as a power source without assisting the rotating machine 20 will be described. Hereinafter, such traveling of the electrically assisted bicycle 1 is referred to as “pedal traveling”.

  During pedal travel, the three-phase coils 23c of the stator 23 are connected to each other by a short circuit between the phases. As a result, the driver's pedaling force input to the first rotor 22 in a state converted into rotational power by the crankshaft 5 can be applied to the magnetic circuit as described with reference to FIG. 10B and Equation (6). Via the second rotor 24. The power transmitted to the second rotor 24 is transmitted to the rear wheel 2 via the speed increasing mechanism 6 and the transmission 10, and as a result, the bicycle travels.

  Next, an operation during assist by the rotating machine 20 will be described. During the assist, the electric power of the battery 33 is supplied to the stator 23 and the first and second rotating magnetic fields are rotated in the rotation direction of the second rotor 24. As a result, the driver's pedaling force transmitted to the first rotor 22 as the rotational power is combined with the power conversion power obtained by converting the power supplied to the stator 23 into the power as described using the equation (5). After that, it is transmitted to the second rotor 24 and further transmitted to the rear wheel 2.

  During this assist, as shown by the hollow arrow in FIG. 13, the second rotor rotational speed VR2 can be decreased steplessly by reducing the magnetic field rotational speed V0 with respect to the first rotor rotational speed VR1. As a result, the rotational speed of the rear wheel 2 to which the second rotor 24 is connected can be continuously reduced with respect to the crankshaft 5 to which the first rotor 22 is directly connected. Conversely, by increasing the magnetic field rotational speed V0 with respect to the first rotor rotational speed VR1, the second rotor rotational speed VR2 can be increased steplessly. The rotational speed of 2 can be increased steplessly.

  Further, as described using Expression (5), the torque synthesis ratio between the driving equivalent torque TSE from the stator 23 and the first rotor transmission torque TR1 is 1: 1. Further, as described above, an energy input / output relationship similar to that of the planetary gear device is established between the stator 23 and the first and second rotors 22 and 24. From these facts, assuming that a constant pedaling force is input to the first rotor 22, when power is supplied to the stator 23 so that a driving equivalent torque TSE larger than the pedaling force is generated, 1 The rotor rotational speed VR1 decreases. On the other hand, when electric power is supplied to the stator 23 so that a driving equivalent torque TSE smaller than the pedal effort is generated, the first rotor rotational speed VR1 increases. For this reason, during the assist, the electric power supplied to the stator 23 is controlled such that the first rotor rotational speed VR1 is maintained at the value at that time. As a result, the torque synthesis ratio between the driving equivalent torque TSE and the first rotor transmission torque TR1 can be controlled to 1: 1. As described above, since the drive equivalent torque TSE can be controlled even when the first rotor transmission torque TR1 is not known, a torque sensor for detecting it is unnecessary.

  Next, when the electrically assisted bicycle 1 is idling, that is, when the pedaling force is not input to the pedal mechanism 3 and the crankshaft 5 is not rotating, the electrically assisted bicycle 1 is traveling inertia. The operation will be described. During idling, power is supplied to the stator 23 and the first and second rotating magnetic fields are rotated in the rotation direction of the second rotor 24. Further, the magnetic field rotation speed V0 is controlled so that the first rotor rotation speed VR1 becomes 0 with respect to the second rotor rotation speed VR2 at that time. In this case, the relationship between the magnetic field rotation speed V0 and the first and second rotor rotation speeds VR1 and VR2 is the same as that in FIG. In this case, in order to prevent the rotation resistance due to the first and second rotating magnetic fields and the friction of the first rotor 22 and the pedal mechanism 3 from acting on the rear wheel 2 via the second rotor 24, Is supplied with electric power corresponding to these rotational resistance and friction. Hereinafter, the control of the rotating machine 20 for preventing the rotation resistance due to the first and second rotating magnetic fields and the friction of the first rotor 22 from acting on the second rotor 24 performed as described above during idling. Is called "zero torque control".

  As described above, according to the present embodiment, the first and second rotors 22 and 24 are connected to the crankshaft 5 and the rear wheel 2, respectively, so that the rotating machine 20 assists the driver's pedaling force. be able to. Further, the connection between the first and second rotors 22 and 24 and the crankshaft 5 and the rear wheel 2 is performed without using a differential device for synthesizing the pedaling force and the power conversion power, and assisting. The pedaling force and the power conversion power are transmitted to the rear wheel 2 by a so-called magnetic path by non-contact via a magnetic circuit. Therefore, the efficiency of the electrically assisted bicycle 1 can be increased and the configuration of the electrically assisted bicycle 1 can be simplified, reduced in size, and reduced in weight compared to the conventional case using the differential device described above. . Further, as described with reference to FIG. 13, the rotational speed of the rear wheel 2 can be increased and decreased with respect to the crankshaft 5 without using the transmission 10 and in a stepless manner.

  Further, during the pedal running, a short circuit between the phases is performed in the stator 23, whereby the pedaling force input to the first rotor 22 is all transmitted to the second rotor 24 through the magnetic circuit and further transmitted to the rear wheel 2. . Thus, the rear wheel 2 can be driven only by the pedal effort without supplying electric power to the rotating machine 20. Furthermore, since the pedaling force is transmitted to the rear wheel 2 by the magnetic path via the magnetic circuit during the pedal running as in the case of the assist, the efficiency of the electrically assisted bicycle 1 can be increased. Further, since the magnetic field rotational speed V0 is controlled to be substantially 0 during the pedal travel, the rotational resistance acting on the second rotor 24 due to the generation of the first and second rotational magnetic fields is extremely small. The efficiency of the bicycle 1 can be further increased.

  Further, since the magnetic field rotational speed V0 is controlled so that the first rotor rotational speed VR1 becomes a value 0 during idling, the crankshaft 5 can be held in a stopped state, and zero torque control is performed. Can be extended. Further, in the electrically assisted bicycle 1, the one-way clutch that connects / disconnects between the crankshaft 5 and the rear wheel 2 is omitted, and therefore, the configuration of the electrically assisted bicycle 1 is further simplified, reduced in size, and reduced in weight. Cost can be reduced.

  Further, since the first rotor 22 is directly connected to the crankshaft 5, the first rotor rotational speed VR1 is equal to the rotational speed of the crankshaft 5, so that a sensor for detecting the rotational speed of the crankshaft 5 is unnecessary. Become. Further, since the second rotor 24 is connected to the rear wheel 2 via the speed increasing mechanism 6 and the transmission 10, the second rotor rotational speed VR 2 and a predetermined speed increasing ratio of the speed increasing mechanism 6, Since the rotational speed of the rear wheel 2 can be calculated according to the gear position of the transmission 10 detected by the gear position sensor 43, a sensor for detecting the rotational speed of the rear wheel 2 becomes unnecessary. In addition, since the rotating machine 20 is provided at the lower end of the center of the electrically assisted bicycle 1 and is provided integrally with the pedal mechanism 3, a good weight balance of the electrically assisted bicycle 1 can be obtained.

  Next, an electrically assisted bicycle 1A according to a second embodiment of the present invention will be described with reference to FIG. This electrically assisted bicycle 1A is different from the first embodiment only in that it further includes a first one-way clutch C1. In FIG. 14, the same components as those in the first embodiment are denoted by the same reference numerals. The same applies to other embodiments described later. In the present embodiment, the first one-way clutch C1 corresponds to the clutch in the invention of claim 2 and the one-way clutch in the invention of claim 3.

  The first one-way clutch C1 has an input portion C1a directly connected to the output shaft 10b of the transmission 10 and an output portion C1b directly connected to the rear wheel 2. During the travel of the electrically assisted bicycle 1A, the output shaft 10b and the rear wheel 2, that is, between the second rotor 24 and the rear wheel 2, are shut off when the rotational speed of the output part C1b is higher than the rotational speed of the input part C1a, and are otherwise connected.

  In this electrically assisted bicycle 1A, operations during pedal travel and assist are performed in the same manner as in the first embodiment. Thus, the pedaling force of the driver is transmitted to the output shaft 10b of the transmission 10 through the first and second rotors 22 and 24 during pedal travel and assist. In this case, since the rear wheel 2 is driven only when the pedaling force is transmitted, the rotational speed of the output portion C1b of the first one-way clutch C1 to which the rear wheel 2 is connected is the input speed to which the output shaft 10b is connected. It cannot be higher than the rotational speed of the portion C1a. Accordingly, the first one-way clutch C1 keeps the connection between the output shaft 10b and the rear wheel 2 during pedal operation and assist, so that the power transmitted to the output shaft 10b is transmitted to the rear wheel 2. The

  The operation during idling is different from that of the first embodiment. Specifically, the pedaling force is not input to the crankshaft 5 during idling, the rotational resistance due to the first and second rotating magnetic fields, the friction of the first rotor 22, and the like are the input part C1a of the first one-way clutch C1. As a result, the rotational speed of the input section C1a decreases, and accordingly, the rotational speed of the output section C1b that rotates with the rear wheel 2 becomes higher than the rotational speed of the input section C1a. As a result, during idling, the first one-way clutch C1 causes the output shaft 10b and the rear wheel 2, that is, between the pedal mechanism 3, the rotating machine 20, the speed increasing mechanism 6, and the transmission 10 and the rear wheel 2. Is cut off.

  Thus, according to the present embodiment, the crankshaft 5 can be held in a stopped state during idling, and the friction of the pedal mechanism 3, the rotating machine 20, the speed increasing mechanism 6, and the transmission 10 acts on the rear wheel 2. Can be completely prevented, so that the distance traveled by running idle can be extended. Further, unlike the first embodiment, the above-described zero torque control is not performed, and accordingly, the power of the battery 33 can be secured and the travel distance by the assist can be extended.

  Furthermore, since the first one-way clutch C1 is used instead of the hydraulic clutch, the configuration of the electric assist bicycle 1A is simplified, reduced in size, and reduced in weight compared to the case where the hydraulic clutch is used. In addition, the cost of the electrically assisted bicycle 1A can be reduced.

  In the present embodiment, since the first one-way clutch C1 for cutting off the gap between the second rotor 24 and the rear wheel 2 is provided, the configuration can be simplified and the cost can be reduced by omitting the one-way clutch. However, the other effects of the first embodiment, that is, the effect of improving the efficiency of the electrically assisted bicycle 1A can be obtained in the same manner.

  In the present embodiment, the first one-way clutch C1 is provided between the output shaft 10b of the transmission 10 and the rear wheel 2. However, as long as the second rotor 24 and the rear wheel 2 can be connected and disconnected. Other suitable positions, for example, between the second sprocket 8 and the input shaft 10a of the transmission 10, between the second rotor 24 and the rotary shaft 21, and between the rotary shaft 21 and the first sprocket 7. Also good.

  Next, an electrically assisted bicycle 1B according to a third embodiment of the present invention will be described with reference to FIG. This electric assist bicycle 1B is different from the second embodiment only in that it further includes a second one-way clutch C2 and a torque sensor 44. The second one-way clutch C2 has an input part C2a directly connected to the first rotor 22 and an output part C2b directly connected to the second rotor 24, and the rotation of the output part C2b is performed while the electrically assisted bicycle 1B is running. When the speed, that is, the second rotor rotational speed VR2 is higher than the rotational speed of the input section C2a, that is, the first rotor rotational speed VR1, the first rotor 22 and the second rotor 24 are disconnected, and otherwise they are connected. The torque sensor 44 detects the first rotor transmission torque TR1 and outputs a detection signal to the ECU 31.

  In the present embodiment, the second one-way clutch C2 corresponds to the clutch in the invention of claim 4 and the one-way clutch in the invention of claim 5. In the present embodiment, the crankshaft 5 and the first rotor 22 correspond to the first power transmission system in the invention of claim 4, and the second rotor 24, the speed increasing mechanism 6, the transmission 10, and the rear wheel 2. Corresponds to the second power transmission system in the invention of claim 4.

  In this electrically assisted bicycle 1B, only the operation during pedaling and assisting is different from that in the second embodiment, and the operation during idling is performed in the same manner as in the second embodiment. First, the operation during pedal travel will be described. That is, during pedal travel, the second rotor 24 is driven for the first time by the driver's pedaling force being transmitted from the first rotor 22, and therefore the second rotor rotational speed VR2 is higher than the first rotor rotational speed VR1. Don't be expensive. Therefore, during pedal travel, the second one-way clutch C2 keeps the connection between the first and second rotors 22 and 24, so that the pedaling force transmitted to the first rotor 22 is applied to the second rotor 24. Is transmitted to the output shaft 10 b of the transmission 10. Similarly to the second embodiment, the first one-way clutch C1 holds the output shaft 10b and the rear wheel 2 in a connected state, so that the power transmitted to the output shaft 10b is transmitted to the rear wheel 2. Is done. For this reason, in this embodiment, during pedal travel, unlike the first and second embodiments, no interphase short circuit is performed in the stator 23.

  Further, even during the assist, as long as the second rotor rotational speed VR2 does not become higher than the first rotor rotational speed VR1, the second one-way clutch C2 keeps the connection between the first and second rotors 22 and 24. Is done. As described above, when the first and second rotors 22 and 24 are integrated, even if the driving equivalent torque TSE from the stator 23 is small as compared with the pedaling force transmitted to the first rotor 22, the first implementation is performed. As described in the embodiment, the first rotor rotational speed VR1 does not increase. For this reason, in this embodiment, since the second rotor rotational speed VR2 is not higher than the first rotor rotational speed VR1 during the assist, the first and second rotors 22 and 24 are not connected. The electric power supplied to the stator 23 is controlled based on the first rotor transmission torque TR1 detected by the torque sensor 44, so that the ratio of the driving equivalent torque TSE and the first rotor transmission torque TR1 is 1: 1. Be controlled.

  As described above, according to the present embodiment, the second one-way clutch C2 maintains the connected state between the first and second rotors 22 and 24 during pedal travel. Therefore, even when the magnetic circuit is not formed between the stator 23 and the first and second rotors 22 and 24 due to, for example, a failure of the stator 23, the driver's pedaling force is applied to the first and second rotors 22 and 24. 24 can be transmitted to the rear wheel 2 via the pedal 24 and can be pedaled. For the same reason, the pedaling force can be transmitted to the rear wheel 2 without pedaling between the stators 23 described in the first embodiment, and pedal travel can be performed.

  Further, the second one-way clutch C2 blocks the first rotor 22 and the second rotor 24 when the second rotor rotational speed VR2 becomes higher than the first rotor rotational speed VR1. Therefore, as described with reference to FIG. 13, such a rear wheel 2 is used when the rotational speed of the rear wheel 2 is increased steplessly with respect to the crankshaft 5 without using the transmission 10 during the assist. Can be increased without any problem.

  Furthermore, since the second one-way clutch C2 is used instead of the hydraulic clutch, the configuration of the electric assist bicycle 1B is simplified, reduced in size, and reduced in weight as compared with the case where a hydraulic clutch is used. In addition, the cost of the electrically assisted bicycle 1B can be reduced.

  In the present embodiment, the first and second rotors 22 and 24 are connected to each other by the second one-way clutch C2 during pedal travel. The rotational resistance due to the first and second rotating magnetic fields generated along with the rotation acts on the rear wheel 2 via the second rotor 24. Accordingly, the efficiency of the electrically assisted bicycle 1 </ b> B is reduced during pedal travel as compared to the first and second embodiments. In this case, electric power corresponding to the rotational resistance is supplied to the stator 23, and the first and second rotating magnetic fields generated thereby are rotated in the rotating direction of the second rotor 24, and the magnetic field rotational speed V0 is set to rotate the second rotor. By controlling to be equal to the speed VR2, the rotational resistance due to the first and second rotating magnetic fields does not act on the rear wheel 2, and high efficiency of the electrically assisted bicycle 1B can be ensured. Further, according to the present embodiment, although the deceleration control of the rear wheel 2 during the assist described with reference to FIG. 13 cannot be performed, the effect of the other second embodiment, that is, the high efficiency of the electrically assisted bicycle 1B, etc. The effect of can be obtained similarly.

  In this embodiment, the second one-way clutch C2 is provided between the first rotor 22 and the second rotor 24. However, when the second rotor rotational speed VR2 is higher than the first rotor rotational speed VR1, Any other suitable position may be provided as long as the first and second rotors 22 and 24 can be blocked. For example, it may be provided between the crankshaft 5 and one of the second rotor 24, the rotary shaft 21 and the first sprocket 7, or between the first rotor 22 and one of the rotary shaft 21 and the first sprocket 7. Good.

  In the present embodiment, the first one-way clutch C1 may be omitted. In this case, the second one-way clutch C2 is connected to the power transmission system including the crankshaft 5 and the first rotor 22 that are connected to each other. The second rotor 24, the rotating shaft 21, the speed increasing mechanism 6, the speed change device 10, and the power transmission system including the rear wheel 2 that are coupled to each other may be provided at any position that can be connected and disconnected. . Further, in this case, a path for connecting the crankshaft 5 and the rear wheel 2 is provided in parallel with the speed increasing mechanism 6 and the transmission 10, and a second one-way clutch C2 is provided on this path, and the crankshaft 5 and the rear wheel 2 are connected. It is also within the scope of the present invention to connect and disconnect between the wheels 2.

  Next, an electrically assisted bicycle 1C according to a fourth embodiment of the present invention will be described with reference to FIG. This electrically assisted bicycle 1 </ b> C is mainly different from the first embodiment in the connection relationship among the rear wheel 2, the pedal mechanism 3, and the rotating machine 20. Specifically, unlike the first embodiment, the first rotor 22 is not directly connected to the crankshaft 5 of the pedal mechanism 3, and the first sprocket 7 of the speed increasing mechanism 6 is directly connected. Further, unlike the first embodiment, the rotating machine 20 is not provided at the lower end of the center of the frame of the electric assist bicycle 1C, but is provided at the rear end of the frame. Further, unlike the first embodiment, the rear wheel 2 is not directly connected to the output shaft 10b of the transmission 10 and the first rotor 22 is directly connected. Further, the rotating shaft 21 of the rotating machine 20 is directly connected to the rear wheel 2 instead of the first sprocket 7. As described above, unlike the first embodiment, the first rotor 22 is connected to the crankshaft 5 via the transmission 10 and the speed increasing mechanism 6, and the second rotor 24 is different from the first embodiment. Unlikely, the speed increasing mechanism 6 and the transmission 10 are not directly connected to the rear wheel 2.

  In the electrically assisted bicycle 1C having the above-described configuration, operations during pedal travel, assist, and idling are performed in the same manner as in the first embodiment. As a result, the pedaling force transmitted to the crankshaft 5 is transmitted to the rear wheel 2 through the speed increasing mechanism 6, the transmission 10, and the first and second rotors 22 and 24 during pedal travel and assist. .

  As described above, according to the present embodiment, the effect of the first embodiment, that is, the effect of improving the efficiency of the electrically assisted bicycle 1C can be obtained similarly. Further, since the second rotor 24 is directly connected to the rear wheel 2 without using the speed increasing mechanism 6, the speed increasing mechanism 6 is connected between the second rotor 24 and the rear wheel 2 in the first embodiment. Compared to the case, the torque transmitted from the crankshaft 5 to the first and second rotors 22 and 24 is reduced, and the torque required for the rotating machine 20 is reduced, thereby reducing the size of the rotating machine 20. Can be achieved.

  Further, since the second rotor 24 is directly connected to the rear wheel 2, the second rotor rotational speed VR2 is equal to the rotational speed of the rear wheel 2, so that a sensor for detecting the rotational speed of the rear wheel 2 is unnecessary. Become. Further, since the crankshaft 5 is connected to the first rotor 22 via the speed increasing mechanism 6 and the transmission 10, the predetermined speed increasing ratio of the speed increasing mechanism 6 and the detected gear position of the speed changing device 10 are detected. Thus, the rotational speed of the crankshaft 5 can be calculated based on the first rotor rotational speed VR1, and therefore a sensor for detecting the rotational speed of the crankshaft 5 is not required.

  Next, an electrically assisted bicycle 1D according to a fifth embodiment of the present invention will be described with reference to FIG. This electric assist bicycle 1D is different from the fourth embodiment only in that a third one-way clutch C3 is further provided. The third one-way clutch C3 has an input portion C3a directly connected to the output shaft 10b of the transmission 10 and an output portion C3b directly connected to the first rotor 22, and the output shaft 10b and the first rotor 22 are connected to each other. In other words, the crankshaft 5 and the first rotor 22 are disconnected when the rotational speed of the output part C3b is higher than the rotational speed of the input part C3a, and are otherwise connected. In the present embodiment, the third one-way clutch C3 corresponds to the first clutch in the invention of claim 6 and the first one-way clutch in the invention of claim 7.

  In the electrically assisted bicycle 1D having the above-described configuration, the pedal operation and the assist operation are performed in the same manner as in the first and fourth embodiments. Thus, the pedaling force of the driver is transmitted to the output shaft 10 b of the transmission 10 through the speed increasing mechanism 6 during pedal travel and assist. In this case, the first and second rotors 22 and 24 and the rear wheel 2 are driven for the first time when the pedaling force is transmitted, and therefore the output portion C3b of the third one-way clutch C3 to which the first rotor 22 is connected. The rotational speed cannot be higher than the rotational speed of the input part C3a to which the output shaft 10b is connected. Accordingly, during the pedal running and during the assist, the third one-way clutch C3 keeps the connection between the output shaft 10b and the first rotor 22 by the third one-way clutch C3, so that the power transmitted to the output shaft 10b is transmitted to the first rotor 22. Is transmitted to the rear wheel 2 via the second rotor 24.

  The operation during idling, in particular, zero torque control is different from those in the first and fourth embodiments. Specifically, when the crankshaft 5 is held in a stopped state while the first rotor 22 is rotating due to inertia during idling, the output shaft 10b connected to the crankshaft 5 is also held in a stopped state. Accordingly, the rotational speed of the output part C3b of the third one-way clutch C3 becomes higher than the rotational speed of the input part C3a. As a result, the crankshaft 5 and the first rotor 22 are disconnected by the third one-way clutch C3. As a result, the crankshaft 5 and the second rotor 24 connected to the first rotor 22 via a magnetic circuit and the rear The connection with the wheel 2 is interrupted. In addition, the combined ratio of the interruption between the crankshaft 5 and the first rotor 22 and the power conversion power from the stator 23 and the power from the first rotor 22 as described above is 1: 1. Therefore, during the zero torque control, the magnetic field rotation speed V0 is controlled to be the same as the second rotor rotation speed VR2, unlike the first and fourth embodiments. In addition, during zero torque control, the stator 23 is supplied with electric power corresponding to the rotational resistance by the first and second rotating magnetic fields and the friction of the first rotor 22 as in the first and fourth embodiments. is there.

  As described above, according to the present embodiment, during idle running, the third one-way clutch C3 interrupts the crankshaft 5 and the first rotor 22, and consequently interrupts the crankshaft 5 and the rear wheel 2. Therefore, the crankshaft 5 can be held in a stopped state. Further, as in the first and fourth embodiments, the rotation resistance by the first and second rotating magnetic fields and the friction of the first rotor 22 act on the rear wheel 2 via the second rotor 22 by the zero torque control. Can be prevented. Furthermore, during this zero torque control, the magnetic field rotational speed V0 is controlled to be the same as the second rotor rotational speed VR2, so that the magnetic field rotational speed V0 is controlled to be higher than the second rotor rotational speed VR2. Compared to the above, the electric power for zero torque control can be reduced, and therefore the electric power of the battery 33 can be ensured, and as a result, the travel distance by the assist can be extended.

  Further, according to the present embodiment, since the third one-way clutch C3 is used instead of the hydraulic clutch, the configuration of the electric assist bicycle 1D is simplified as compared with the case where the hydraulic clutch is used. The size and weight can be reduced, and the cost of the electrically assisted bicycle 1D can be reduced.

  In the present embodiment, since the third one-way clutch C3 is provided, effects such as simplification of the configuration and cost reduction by omitting the one-way clutch cannot be obtained. The effect, that is, the effect of improving the efficiency of the electrically assisted bicycle 1D can be obtained in the same manner.

  In the present embodiment, the third one-way clutch C3 is provided between the output shaft 10b of the transmission 10 and the first rotor 22, but the crankshaft 5 and the first rotor 22 can be connected and disconnected. For example, another appropriate position, for example, between the crankshaft 5 and the first sprocket 7 or between the second sprocket 8 and the input shaft 10a may be provided.

  Next, an electrically assisted bicycle 1E according to a sixth embodiment of the present invention will be described with reference to FIG. This electrically assisted bicycle 1E differs from the fifth embodiment only in that it further includes a fourth one-way clutch C4, a torque sensor 44 of the third embodiment, and a current / voltage sensor 45. The fourth one-way clutch C4 has an input part C4a directly connected to the first rotor 22 and an output part C4b directly connected to the second rotor 24, and the rotational speed of the output part C4b, that is, the second rotor rotational speed VR2. However, when it is higher than the rotational speed of the input part C4a, that is, the first rotor rotational speed VR1, the first rotor 22 and the second rotor 24 are disconnected, and otherwise they are connected.

  In the present embodiment, the fourth one-way clutch C4 corresponds to the clutch and the one-way clutch in the inventions of claims 4 and 5, and the second clutch and the second one-way clutch in the inventions of claims 8 and 9. Further, the crankshaft 5, the speed increasing mechanism 6, the transmission 10, and the first rotor 22 correspond to the first power transmission system in the invention of claim 4, and the second rotor 24 and the rear wheel 2 are claimed in claim 4. This corresponds to the second power transmission system in the invention.

  The current / voltage sensor 45 detects a current / voltage value input / output to / from the battery 33 and outputs a detection signal to the ECU 31. The ECU 31 calculates the state of charge SOC of the battery 33 based on this detection signal.

  In this electrically assisted bicycle 1E, the operation during pedal travel is performed as follows. That is, as in the fifth embodiment, the third one-way clutch C <b> 3 is held in the connected state during pedal travel, whereby the driver's pedal effort is transmitted to the first rotor 22. In addition, since the second rotor 24 and the rear wheel 2 that are directly connected to each other are driven for the first time when power is transmitted from the first rotor 22, the second rotor rotational speed VR2 is greater than the first rotor rotational speed VR1. But not too high. Therefore, during the pedal travel, the fourth one-way clutch C4 keeps the connection between the first and second rotors 22 and 24, so that the power transmitted to the first rotor 22 is transmitted to the second rotor 24. Is transmitted to the rear wheel 2. For this reason, in the present embodiment, the interphase short circuit is not performed in the stator 23 during pedal travel, unlike the first embodiment.

  Further, even during the assist, as long as the second rotor rotational speed VR2 does not become higher than the first rotor rotational speed VR1, the fourth one-way clutch C4 holds the first and second rotors 22 and 24 in a connected state. Is done. Therefore, in the present embodiment, as in the third embodiment, during the assist, the second rotor rotational speed VR2 is not higher than the first rotor rotational speed VR1, and the first and second rotors 22 and 24 are connected. In this state, the electric power supplied to the stator 23 is controlled based on the detected first rotor transmission torque TR1, so that the ratio between the driving equivalent torque TSE and the first rotor transmission torque TR1 is 1: 1 is controlled.

  Furthermore, during idle running, when the state of charge SOC is greater than a predetermined value and the battery 33 has sufficient power remaining, the idle running operation is performed in the same manner as in the fifth embodiment. Further, during idle running, when the state of charge SOC is smaller than a predetermined value and the battery 33 does not have enough power remaining, the power of the rear wheel 2 is used to generate power in the stator 23 and the generated power is 33 is charged.

  As a result of this power generation, the torque that causes the first rotor 22 to act in the rotational direction of the second rotor 24 is caused by the energy input / output relationship between the stator 23 and the first and second rotors 22 and 24 described above. As a result, the first rotor rotational speed VR1 increases. In this case, when the increased first rotor rotational speed VR1 becomes equal to the second rotor rotational speed VR2, thereafter, as long as torque that rotates in the rotational direction of the second rotor 24 along with power generation acts on the first rotor 22. The first and second rotors 22, 24 are connected by the fourth one-way clutch C4, and the rotors 22, 24 are integrated. Therefore, the power transmitted from the rear wheel 2 to the first and second rotors 22 and 24 can be appropriately transmitted to the stator 23 as electric power. Further, as in the fifth embodiment, during idle running, the third one-way clutch C3 interrupts the connection between the crankshaft 5 and the first rotor 22, so that the power generation described above is performed between the crankshaft 5 and the first rotor 22. It is performed in a state where the interval is interrupted.

  As described above, according to this embodiment, the first and second rotors 22 and 24 are held in the connected state by the fourth one-way clutch C4 during pedal travel. Therefore, even when the magnetic circuit is not formed between the stator 23 and the first and second rotors 22 and 24 due to, for example, a failure of the stator 23, the driver's pedaling force is reduced to the first level as in the third embodiment. And it can transmit to the rear-wheel 2 via the 2nd rotors 22 and 24, and pedal travel can be performed. For the same reason, the pedaling force can be transmitted to the rear wheel 2 without pedaling between the stators 23 described in the first embodiment, and pedal travel can be performed.

  Further, when the second rotor rotational speed VR2 is higher than the first rotor rotational speed VR1 by the fourth one-way clutch C4, the first rotor 22 connected to the crankshaft 5 and the rear wheel 2 are connected. The connection with the second rotor 24 is interrupted. Therefore, as in the third embodiment, as described with reference to FIG. 13, during the assist, when the rotational speed of the rear wheel 2 is increased steplessly with respect to the crankshaft 5 without using the transmission 10. Such a speed increase of the rear wheel 2 can be performed without any trouble.

  Furthermore, during idle running, the power of the rear wheel 2 is used to generate power in the stator 23 and the generated power is charged to the battery 33, so that the travel distance by assist can be extended. Further, since this power generation can be performed by the third one-way clutch C3 in a state where the crankshaft 5 and the first rotor 22 are disconnected, the friction by the pedal mechanism 3 acts on the second rotor 24 via the first rotor 22. And thus can charge the battery 33 with more power.

  Further, since the fourth one-way clutch C4 is used instead of the hydraulic clutch, the configuration of the electrically assisted bicycle 1E is simplified, reduced in size, and reduced in weight as compared with the case where a hydraulic clutch is used. In addition, the cost of the electrically assisted bicycle 1E can be reduced.

  In the present embodiment, during the pedal travel, the fourth one-way clutch C4 holds the first and second rotors 22 and 24 in the connected state. The rotational resistance due to the first and second rotating magnetic fields generated along with the rotation acts on the rear wheel 2 via the second rotor 24. Accordingly, during pedal travel, the efficiency of the electrically assisted bicycle 1B is reduced as compared with the fourth and fifth embodiments. In this case, as in the third embodiment, electric power corresponding to this rotational resistance is supplied to the stator 23, and the first and second rotating magnetic fields generated thereby are rotated in the rotating direction of the second rotor 24, and the magnetic field is rotated. By controlling the speed V0 to be equal to the second rotor rotational speed VR2, the rotational resistance due to the first and second rotating magnetic fields does not act, and high efficiency of the electrically assisted bicycle 1E can be ensured. Further, according to the present embodiment, although the deceleration control of the rear wheel 2 during the assist described with reference to FIG. 13 cannot be performed, the effect of the other fifth embodiment, that is, the high efficiency of the electrically assisted bicycle 1E, etc. The effect of can be obtained similarly.

  In the present embodiment, the fourth one-way clutch C4 is provided between the first rotor 22 and the second rotor 24. When the second rotor rotational speed VR2 is higher than the first rotor rotational speed VR1, Any other suitable position, for example, between the first rotor 22 and one of the rotating shaft 21 and the rear wheel 2 may be provided as long as the first and second rotors 22 and 24 can be blocked. . In the present embodiment, the third one-way clutch C3 may be omitted. In this case, the fourth one-way clutch C4 is connected to the crankshaft 5, the speed increasing mechanism 6, the transmission 10 and the first gear connected to each other. The power transmission system including the rotor 22 and the power transmission system including the second rotor 24 and the rear wheel 2 connected to each other may be connected and disconnected. In this case, a path for connecting the crankshaft 5 and the rear wheel 2 is provided in parallel with the speed increasing mechanism 6 and the transmission 10, and a fourth one-way clutch C4 is provided in this path, and the crankshaft 5 and the rear wheel 2 are connected. It is also within the scope of the present invention to connect and disconnect between the two.

  Next, an electrically assisted bicycle 1F according to a seventh embodiment of the present invention will be described. In this electrically assisted bicycle 1F, unlike the sixth embodiment, the input portion C4a of the fourth one-way clutch C4 is directly connected to the output shaft 10b of the transmission 10 instead of the first rotor 22. Further, the output portion C4b of the fourth one-way clutch C4 is directly connected to the rear wheel 2, that is, connected to the second rotor 24 via the rear wheel 2. When the rotational speed of the output part C4b is higher than the rotational speed of the input part C4a, the fourth one-way clutch C4 is between the output shaft 10b and the rear wheel 2, that is, the crankshaft 5, the rear wheel 2 and the second rotor 24. The connection is interrupted, otherwise it is connected. The connection relationship of other elements is the same as in the sixth embodiment.

  In the present embodiment, the third one-way clutch C3 corresponds to the first one-way clutch in the invention of claim 10, and the fourth one-way clutch C4 corresponds to the second one-way clutch in the invention of claim 10. The second rotor 24 and the rear wheel 2 correspond to the power transmission system in the invention of claim 10.

  In the electrically assisted bicycle 1F having the above configuration, the operation during pedal travel is performed as follows. That is, during the pedal travel, the second rotor 24 and the rear wheel 2 are driven only when the driver's pedaling force is transmitted, so the fourth one-way clutch C4 coupled to the second rotor 24 and the rear wheel 2 is driven. The rotation speed of the output section C4b of the transmission section 10 is not higher than the rotation speed of the input section C4b connected to the output shaft 10b of the transmission 10. Therefore, during pedal travel, the fourth one-way clutch C4 maintains the connected state between the output shaft 10b, the second rotor 24 and the rear wheel 2, so that the pedaling force transmitted to the crankshaft 5 is increased in speed. It is transmitted to the rear wheel 2 via the mechanism 6, the transmission 10 and the fourth one-way clutch C4. For this reason, in the present embodiment, the interphase short circuit is not performed in the stator 23, unlike the first embodiment during pedal travel.

  In addition, during pedal travel, the first input generated as the second rotor 24 rotates with the rear wheel 2 due to the energy input / output relationship between the stator 23 and the first and second rotors 22 and 24 described above. The rotation resistance due to the second rotating magnetic field acts on the first rotor 22 so as to rotate the first rotor 22 in the rotation direction of the second rotor 24, and acts on the second rotor 24 and the rear wheel 2 as a load. . Further, the friction of the first rotor 22 acts on the second rotor 24 as a load. The rotational resistance caused by the first and second rotating magnetic fields and the friction of the first rotor 22 are 1: 1 because of the energy input / output relationship between the stator 23 and the first and second rotors 22 and 24 described above. And then transmitted to the second rotor 24.

  In the rotating machine 10, the rotational resistance due to the first and second rotating magnetic fields is larger than the friction of the first rotor 22 due to its configuration. For this reason, the first rotor rotational speed VR1 is changed to the second rotor rotational speed VR2, that is, the transmission 10 to which the second rotor 24 is connected by the rotational resistance due to the first and second rotating magnetic fields acting as described above. The rotational speed of the output shaft 10b becomes higher. Accordingly, the rotational speed of the output part C3b of the third one-way clutch C3 to which the first rotor 22 is connected becomes higher than the rotational speed of the input part C3a to which the output shaft 10b is connected. As a result, the output shaft 10b and the first rotor 22 are disconnected by the third one-way clutch C3, and accordingly, the second rotor 24 and the first rotor 22 connected to the output shaft 10b are also disconnected. .

  Further, during the assist, from the input / output relationship of energy between the stator 23 and the first and second rotors 22, 24 described above, the torque from the stator 23 causes the first rotor 22 to move in the rotational direction of the second rotor 24. It acts on the first rotor 22 to rotate in the reverse direction. As a result, the rotational speed of the output portion C3b of the third one-way clutch C3 does not become higher than the rotational speed of the input portion C3a, so that the third one-way clutch C3 causes the crankshaft between the output shaft 10b and the first rotor 22. 5 and the first rotor 22 are kept in a connected state, and as a result, the driver's pedaling force is transmitted to the first rotor 22. Accordingly, also in this case, as in the first embodiment, the pedal effort from the crankshaft 5 and the power conversion power from the stator 23 are combined via the magnetic circuit and then transmitted to the rear wheel 2.

  Further, as described above, unless the rotational speed of the output section C3b, that is, the first rotor rotational speed VR1, is higher than the rotational speed of the input section C3a, that is, the rotational speed of the output shaft 10b, the output shaft 10b and the first rotor 22 Are connected. Further, the output shaft 10b and the second rotor 24 are connected unless the rotational speed of the output section C4b, that is, the second rotor rotational speed VR2 is higher than the rotational speed of the input section C4a, that is, the rotational speed of the output shaft 10b. . From the above, during the assist, when the first and second rotor rotational speeds VR1 and VR2 are equal to each other, the output shaft 10b, the third and fourth one-way clutches C3 are between the first and second rotors 22 and 24. , C4, the connection state is maintained. For this reason, in the present embodiment, during the assist, the first and second rotor rotational speeds VR1 and VR2 are equal to each other, and the first and second rotors 22 and 24 are connected to each other. As in the embodiment, the electric power supplied to the stator 23 is controlled based on the first rotor transmission torque TR1 detected by the torque sensor 44, whereby the ratio between the driving equivalent torque TSE and the first rotor transmission torque TR1 is 1. : 1 is controlled.

  Further, as in the fifth and sixth embodiments, when the crankshaft 5 is held in a stopped state while the first rotor 22 is rotating due to inertia during idle running, the transmission 10 is moved by the third one-way clutch C3. Between the output shaft 10b of the first rotor 22 and the first rotor 22 is cut off. As a result, the crankshaft 5 and the second rotor 24 and the rear wheel 2 connected to the first rotor 22 via a magnetic circuit are cut off. . Further, since the rotational speed of the output portion C4b of the fourth one-way clutch C4 is higher than the rotational speed of the input portion C4a, the fourth one-way clutch C4 causes the output shaft 10b to be connected between the second rotor 24 and the rear wheel 2, that is, The crankshaft 5 is disconnected from the second rotor and the rear wheel 2. Also, zero torque control is performed in the same manner as in the fifth embodiment. That is, the stator 23 is supplied with electric power corresponding to the rotational resistance due to the first and second rotating magnetic fields and the friction of the first rotor 22, and the magnetic field rotational speed V0 is controlled to be the same as the second rotor rotational speed VR2. .

  As described above, according to the present embodiment, the crankshaft 5 and the second rotor 24 and the rear wheel 2 are kept connected by the fourth one-way clutch C4 during pedal travel. Therefore, even when the magnetic circuit is not formed between the stator 23 and the first and second rotors 22 and 24 due to, for example, a failure of the stator 23, the driver's pedaling force is applied to the rear wheel 2 as in the third embodiment. Can be transmitted to the pedal, and pedal travel can be performed. For the same reason, the pedaling force can be transmitted to the rear wheel 2 without pedaling between the stators 23 described in the first embodiment, and pedal travel can be performed.

  Further, during the pedal travel, the third one-way clutch C3 blocks the second rotor 24 and the first rotor 22. Therefore, when the first and second rotors 22 and 24 are held in the connected state, that is, unlike the case of the sixth embodiment, only a part of the rotational resistance due to the first and second rotating magnetic fields is reduced to the first and second. Since the rotational resistances caused by the first and second rotating magnetic fields do not act on the second rotor 24 by acting on the second rotors 22 and 24, the efficiency of the electrically assisted bicycle 1F during pedal travel can be increased. it can.

  Further, when the second rotor rotational speed VR2 is higher than the rotational speed of the output shaft 10b connected to the crankshaft 5 by the fourth one-way clutch C4, the gap between the crankshaft 5 and the second rotor 22 and the rear wheel 2 is increased. Is cut off. Therefore, as described with reference to FIG. 13, during the assist, the rotational speed of the rear wheel 2 is increased steplessly with respect to the crankshaft 5 without using the transmission 10 by controlling the magnetic field rotational speed V0. In this case, as in the sixth embodiment, such a speed increase of the rear wheel 2 can be performed without hindrance.

  During idle running, the crankshaft 5 and the rear wheel 2 are disconnected by the third and fourth one-way clutches C3 and C4, so that the crankshaft 5 is held in a stopped state as in the first embodiment. can do. Further, during idle running, the crankshaft 5 and the first rotor 22 are disconnected, and zero torque control is performed in the same manner as in the fifth embodiment. Thus, as in the fifth embodiment, the power for zero torque control can be reduced as compared with the first and fourth embodiments, so that the power of the battery 33 can be secured and the travel distance by the assist can be extended. .

  In the present embodiment, during idling, the battery 33 is not charged using the power of the rear wheel 2. Therefore, the effect of extending the travel distance by assist resulting therefrom is not obtained, but the other sixth implementation The effect of the form, that is, the effect of improving the efficiency of the electrically assisted bicycle 1F can be obtained similarly.

  In the present embodiment, the output portion C4b of the fourth one-way clutch C4 is directly connected to the rear wheel 2. However, the output portion C4b is directly connected to the second rotor 24, and is connected to the crankshaft 5, the second rotor 24, and the rear wheel 2. May be connected / disconnected by the fourth one-way clutch C4. In the present embodiment, the third one-way clutch C3 is provided between the output shaft 10b and the first rotor 22, and the fourth one-way clutch C4 is provided between the output shaft 10b and the rear wheel 2. Both one-way clutches C3 and C4 may be provided as follows. That is, while providing in parallel the 1st path | route which connects between the crankshaft 5 and the 1st rotor 22, and the 2nd path | route which connects between the crankshaft 5, the 2nd rotor 24, and the rear-wheel 2, The first and second paths may be provided with third and fourth one-way clutches C3 and C4. In this case, of course, the first and second paths may be configured by an arbitrary mechanism such as a combination of a plurality of gears and shafts, a combination of a sprocket and a chain, or a combination of a belt and a pulley.

  Next, an electrically assisted bicycle 1G according to an eighth embodiment of the present invention will be described. In this electrically assisted bicycle 1G, unlike the seventh embodiment, the input portion C3a of the third one-way clutch C3 is directly connected to the input shaft 10a, not the output shaft 10b of the transmission 10, and the output portion C3b is As in the seventh embodiment, it is directly connected to the first rotor 22. The third one-way clutch C3 shuts off the input shaft 10a and the first rotor 22 when the rotational speed of the output part C3b is higher than the rotational speed of the input part C3a, and connects otherwise. The connection relationship of other elements is the same as in the seventh embodiment.

  In the electrically assisted bicycle 1G having the above-described configuration, operations during pedal running, assisting, and idling are performed in the same manner as in the seventh embodiment. As described above, according to the present embodiment, the effects of the seventh embodiment can be obtained similarly.

  In the present embodiment, the output portion C4b of the fourth one-way clutch C4 is directly connected to the rear wheel 2. However, the output portion C4b is directly connected to the second rotor 24, and is connected to the crankshaft 5, the second rotor 24, and the rear wheel 2. May be connected / disconnected by the fourth one-way clutch C4.

  The present invention is not limited to the embodiments described so far, and can be implemented in various modes. For example, the pedal mechanism 3 in the present embodiment is of a type in which a pedaling force is input, but may be of a type in which a driver's arm force is input. In the present embodiment, the first and second cores 24a and 24b are made of steel plates, but may be made of other soft magnetic materials. Further, in the present embodiment, the difference between the second rotor rotational speed VR2 and the first rotor rotational speed VR1 (hereinafter referred to as “second / first rotor speed difference”), the magnetic field rotational speed V0, and the second rotor rotational speed VR2. Is the example in which the present invention is applied to the rotating machine 20 with the same difference (hereinafter referred to as “magnetic field / second rotor speed difference”). The present invention may be applied to a rotating machine having a magnetic field / second rotor speed difference of 1: n. In the present embodiment, the power storage device in the present invention is the battery 33, but may be a capacitor.

  Furthermore, hydraulic or electromagnetic clutches may be used instead of the first to fourth one-way clutches C1 to C4 in the present embodiment. In this case, in the sixth embodiment, when a hydraulic or electromagnetic clutch is used in place of the third and fourth one-way clutches C3 and C4, for example, the electric assist bicycle only uses the rotating machine 20 as a power source. 1E can be run. Further, in the second and third embodiments, the connection between the second rotor 24 and the rear wheel 2 is performed using the speed increasing mechanism 6, but as in the fourth to eighth embodiments, the increase is made. You may carry out without using the speed mechanism 6. FIG. Furthermore, the speed increasing mechanism 6 may be a belt type or a shaft type instead of the chain type exemplified in the present embodiment. In the present embodiment, the driving wheel in the present invention is the rear wheel 2, but it may be a front wheel.

  Further, the present embodiment is an example in which the present invention is applied to the electrically assisted bicycles 1, 1 </ b> A to 1 </ b> G with the transmission device 10, but the present invention is not limited to this, and the electrically assisted bicycle in which the transmission device is not provided. Applicable. In that case, the efficiency of the electrically assisted bicycle can be further increased. In addition, the present invention may be applied not to the two-wheel electric assist bicycles 1 and 1A to 1G of the present embodiment but to an electric assist bicycle having one or three or more wheels. is there. Furthermore, in this embodiment, the control device that controls the rotating machine 20 is configured by the ECU 31 and the PDU 32, but may be configured by a combination of a microcomputer and an electric circuit. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

It is a figure showing roughly the electric assist bicycle by a 1st embodiment. It is an expanded sectional view of a rotating machine. FIG. 3 is a development view showing a part of a cross section broken along the circumferential direction at the position of the AA line in FIG. 2 when the first and second rotating magnetic fields are generated. It is a figure which shows the structure functionally the same as the structure of the expanded view of FIG. It is a figure for demonstrating operation | movement of the rotary machine at the time of generating the 1st and 2nd rotating magnetic field in the state which made the 1st rotor non-rotatable. FIG. 6 is a diagram for explaining an operation subsequent to FIG. 5. It is a figure which shows the magnetic circuit comprised during operation | movement of a rotary machine. It is a figure which shows typically an example of the torque transmitted to a 2nd rotor when the 1st and 2nd rotating magnetic field is generated in the state which made the 1st rotor non-rotatable. An example of the relationship between the magnetic field rotation speed and the first and second rotor rotation speeds is shown in FIG. 5A for the case where the first rotor is made non-rotatable and (b) the case where the second rotor is made non-rotatable. FIG. An example of the relationship between the magnetic field rotation speed and the first and second rotor rotation speeds is as follows. (A) When both the first and second rotors are rotating, (b) When the magnetic field rotation speed is 0 These are collinear diagrams respectively shown. It is a figure for demonstrating operation | movement of the rotary machine at the time of generating the 1st and 2nd rotating magnetic field in the state which made the 2nd rotor non-rotatable. FIG. 12 is a diagram for explaining an operation subsequent to FIG. 11. It is a figure for demonstrating the speed change operation | movement in the assistance in the electrically assisted bicycle of FIG. It is a figure which shows schematically the electrically assisted bicycle by 2nd Embodiment. It is a figure which shows schematically the electrically assisted bicycle by 3rd Embodiment. It is a figure which shows schematically the electrically assisted bicycle by 4th Embodiment. It is a figure which shows roughly the electrically assisted bicycle by 5th Embodiment. It is a figure which shows schematically the electrically assisted bicycle by 6th Embodiment. It is a figure which shows schematically the electrically assisted bicycle by 7th Embodiment. It is a figure which shows schematically the electrically assisted bicycle by 8th Embodiment.

Explanation of symbols

1 Electric Assist Bicycle 1A Electric Assist Bicycle 1B Electric Assist Bicycle 1C Electric Assist Bicycle 1D Electric Assist Bicycle 1E Electric Assist Bicycle 1F Electric Assist Bicycle 1G Electric Assist Bicycle 2 Rear Wheel (Drive Wheel)
Reference Signs List 3 pedal mechanism 4 pedal 5 crankshaft 6 speed increasing mechanism 20 rotating machine 22 first rotor 23 stator 24 second rotor 33 battery (power storage device)
C1 First one-way clutch (clutch, one-way clutch)
C1a input section (second rotor side of one-way clutch)
C1b Output section (One-way clutch drive wheel side)
C2 Second one-way clutch (clutch, one-way clutch)
C3 Third one-way clutch (first clutch, first one-way clutch)
C3a input (crankshaft side of the first one-way clutch)
C3b output section (first rotor side of the first one-way clutch)
C4 Fourth one-way clutch (clutch, one-way clutch, second clutch, second
One-way clutch)
C4a input section (crankshaft side of the second one-way clutch)
C4b output section (power transmission system side of the second one-way clutch)
VR1 First rotor rotational speed VR2 Second rotor rotational speed

Claims (11)

A pedal mechanism that has a pedal and a crankshaft, converts a force input to the pedal into rotational power, and outputs the rotational power to the crankshaft;
Drive wheels,
A stationary stator for generating a rotating magnetic field, a first rotor made of a magnet and provided so as to face the stator, a soft magnetic body, and provided between the stator and the first rotor And input / output energy between the stator, the first rotor, and the second rotor via a magnetic circuit formed in association with the generation of the rotating magnetic field, As the energy is input / output, the rotating magnetic field, the second and first rotors are configured to rotate while maintaining a predetermined collinear relationship of rotational speed between each other, and the first rotor is A rotating machine coupled to the crankshaft and having the second rotor coupled to the drive wheel;
An electrically assisted bicycle comprising:   The electrically assisted bicycle according to claim 1, further comprising a clutch for connecting / disconnecting between the second rotor and the driving wheel.   The clutch is a one-way clutch that blocks between the second rotor and the drive wheel when the rotation speed on the drive wheel side is higher than the rotation speed on the second rotor side. Item 3. The electric assist bicycle according to item 2.   It further comprises a clutch for connecting / disconnecting between a first power transmission system including the crankshaft and the first rotor and a second power transmission system including the second rotor and the driving wheel. The electrically assisted bicycle according to claim 1.   The clutch is a one-way clutch that blocks between the first rotor and the second rotor when the rotation speed of the second rotor is higher than the rotation speed of the first rotor. Item 5. The electric assist bicycle according to item 4.   The power-assisted bicycle according to claim 1, further comprising a first clutch that connects and disconnects between the crankshaft and the first rotor.   The first clutch is a first one-way clutch that blocks between the crankshaft and the first rotor when the rotational speed on the first rotor side is higher than the rotational speed on the crankshaft side. The electrically assisted bicycle according to claim 6. A second clutch for connecting / disconnecting between the first rotor and a power transmission system including the second rotor and the drive wheel;
A power storage device configured to be chargeable and dischargeable and connected to the stator;
The electric assist bicycle according to claim 6 or 7, further comprising:   The second clutch is a second one-way clutch that blocks between the first rotor and the second rotor when the rotation speed of the second rotor is higher than the rotation speed of the first rotor. The electrically assisted bicycle according to claim 8. A first one-way clutch that shuts off between the crankshaft and the first rotor when the rotational speed on the first rotor side is higher than the rotational speed on the crankshaft side;
The crankshaft is provided between the crankshaft and a power transmission system including the second rotor and the driving wheels, and the crankshaft is rotated when a rotational speed on the power transmission system side is higher than a rotational speed on the crankshaft side. The electric assist bicycle according to claim 1, further comprising: a second one-way clutch that interrupts between the power transmission system and the power transmission system.   The electrically assisted bicycle according to any one of claims 1 to 10, wherein the second rotor is connected to the drive wheel without using a speed increasing mechanism for transmitting power by increasing speed. .

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