JP2010064610A - Power output device, hybrid vehicle and drive unit - Google Patents

Abstract

The present invention suppresses deterioration and breakage of an electric motor.
A rotor 32 of a motor 30 is connected to an input rotating member 42 of a transmission 40 connected to an engine 22 via a damper 24 and an engine rotating member 26 via an electric motor rotating member 36. In addition, the strength of the motor rotation member 36 or the connection portion between the motor rotation member 36 and the input rotation member 42 is made lower than the strength of the rotor 32 of the motor 30. As a result, the deterioration and breakage of the rotor 32 of the motor 30 can be further suppressed.
[Selection] Figure 2

Description

  The present invention relates to a power output device, a hybrid vehicle, and a drive device.

Conventionally, this type of power output apparatus includes an internal combustion engine, a motor generator in which a rotor is directly connected to a crankshaft of the internal combustion engine, and a transmission that transmits power from the internal combustion engine or the motor generator to a drive shaft. Has been proposed (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-78555

  In the above-described power output device, the rotor of the motor generator is directly connected to the internal combustion engine, so that torque fluctuations from the internal combustion engine directly act on the rotor of the motor generator, thereby promoting deterioration of the rotor or from the internal combustion engine. When the fluctuation of the output torque is large beyond the normally assumed range, the rotor may be damaged.

  The main object of the power output device, the hybrid vehicle, and the drive device of the present invention is to further suppress deterioration and breakage of the electric motor.

  The power output device, the hybrid vehicle, and the drive device of the present invention employ the following means in order to achieve the main object described above.

The power output apparatus of the present invention is
A power output device that outputs power to a drive shaft,
An internal combustion engine that outputs power;
An electric motor that inputs and outputs power;
An engine rotating member connected to the internal combustion engine and an electric motor rotating member connected to the rotor of the electric motor and the drive shaft are connected to the internal combustion engine and the electric motor. Power transmission means for transmitting power to the drive shaft;
With
The connecting portion between the rotating member for electric motor and / or the rotating member for electric motor and the power transmission means is formed with lower strength than the strength of the rotor,
It is a summary to provide.

  In the power output apparatus of the present invention, the rotating member for the engine, which is a rotating member connected to the internal combustion engine, and the power transmission means are connected, and the rotating member for the motor, which is a rotating member connected to the rotor of the motor, and the power are connected. By connecting the transmission means, torque fluctuations output from the internal combustion engine are transmitted to the electric motor through the engine rotation member, the power transmission means, and the motor rotation member, so that the motor is connected to the output shaft of the internal combustion engine. Torque fluctuations transmitted to the electric motor can be suppressed as compared with those directly connected to the rotor, and deterioration and breakage of the electric motor can be further suppressed. Further, in the power output device of the present invention, the strength of the rotating member for the motor and the strength of the connecting portion between the rotating member for the motor and the power transmission means are made lower than the strength of the rotor of the motor, thereby Compared to the rotor, the rotating member for the motor and the connecting portion between the rotating member for the motor and the power transmission means are more likely to be damaged, so the fluctuation of the torque output from the internal combustion engine is larger than normally assumed. Sometimes, damage to the rotor of the electric motor can be further suppressed due to damage to the rotating member and the connecting portion.

  In such a power output apparatus of the present invention, the rotor and the rotating member for the electric motor include a spline formed on the inner peripheral side of the rotor and a spline formed on the outer peripheral side of the rotating member for the electric motor. It can also be a fitting. If it carries out like this, it will become possible to replace | exchange the rotating member for electric motors more easily. In this case, the rotor may have the spline formed on the inner peripheral side with a length shorter than the axial length of the rotor. By so doing, torque fluctuations output from the internal combustion engine and transmitted to the motor rotation member, motor rotation fluctuations, and the like can be absorbed by the motor rotation member.

  Further, in the power output device of the present invention, the power transmission means is a predetermined rotating member in which a connecting portion with the rotating member for electric motor is formed with lower strength than a connecting portion with the rotating member for engine. It can also be a means having

  The hybrid vehicle of the present invention is a power output device according to any one of the above-described aspects, that is, basically a power output device that outputs power to a drive shaft, and an internal combustion engine that outputs power, and power input. An electric motor for output, an engine rotating member that is a rotating member connected to the internal combustion engine, an electric motor rotating member that is a rotating member connected to a rotor of the electric motor, and the drive shaft; And power transmission means for transmitting power from the electric motor to the drive shaft, and the connecting portion between the motor rotating member and / or the motor rotating member and the power transmission means is strength of the rotor. The gist of the present invention is that a power output device, which is formed with a lower strength than the above, is mounted and the axle is connected to the drive shaft.

  In the hybrid vehicle of the present invention, since the power output device of the present invention according to any one of the above-described aspects is mounted, the effects exerted by the power output device of the present invention, for example, deterioration and breakage of the rotor of the electric motor are further suppressed. The same effects as those that can be achieved can be achieved.

The drive device of the present invention is
A drive device incorporated in a power output device that outputs power to the drive shaft together with the internal combustion engine,
An electric motor that inputs and outputs power;
An engine rotating member connected to the internal combustion engine and an electric motor rotating member connected to the rotor of the electric motor and the drive shaft are connected to the internal combustion engine and the electric motor. Power transmission means for transmitting power to the drive shaft;
With
The connecting portion between the rotating member for electric motor and / or the rotating member for electric motor and the power transmission means is formed with lower strength than the strength of the rotor,
This is the gist.

  In the drive device according to the present invention, the engine rotation member, which is a rotation member connected to the internal combustion engine, and the power transmission means are connected, and the motor rotation member, which is a rotation member connected to the rotor of the motor, and the power transmission. By connecting the motor, the fluctuation of the torque output from the internal combustion engine is transmitted to the motor through the engine rotation member, the power transmission unit, and the motor rotation member. Torque fluctuations transmitted to the electric motor can be suppressed as compared with those directly connected to the child, and deterioration and breakage of the electric motor can be further suppressed. Further, in the driving device of the present invention, the strength of the rotating member for the motor and the strength of the connecting portion between the rotating member for the motor and the power transmission means are made lower than the strength of the rotor of the motor, thereby rotating the motor. When the fluctuation of the torque output from the internal combustion engine is larger than normally assumed because the motor rotating member and the connecting part of the motor rotating member and the power transmission means are more easily damaged than the child. For example, damage to the rotor of the electric motor can be further suppressed due to damage to the rotating member and the connecting portion.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 equipped with a power output device 21 as an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a part of a cross section of the power output device 21. It is. As shown in FIG. 1, the hybrid vehicle 20 of the embodiment includes an engine 22 configured as an internal combustion engine that outputs power using a hydrocarbon-based fuel such as gasoline or light oil, a motor 30 that inputs and outputs power, and a damper. The power output from the engine 22 to the rotating member (hereinafter referred to as an engine rotating member) 26 and the power output from the motor 30 to the rotating member (hereinafter referred to as an electric motor rotating member) 36 are shifted through the motor 24. A transmission 40 that outputs to a drive shaft 46 connected to the left and right rear wheels 60a and 60b, and a capacitor 50 that exchanges electric power with the motor 30 via an inverter 38 that drives the motor 30 are provided. In addition, if the engine 22 is removed from the power output device 21 of the embodiment, a configuration as a drive device is obtained.

  As shown in FIGS. 1 and 2, the motor 30 has a three-phase structure in which a non-directional electromagnetic steel sheet is laminated and a rotor 32 having a permanent magnet attached to the outer peripheral surface and a non-directional electromagnetic steel sheet are laminated. This is configured as a known synchronous generator motor having a stator 34 around which a coil is wound. The motor rotating member 36 is formed as a hollow cylindrical member through which the engine rotating member 26 penetrates, and is output from the engine 22 when the engine 22 is normally operated, and the damper 24 and the engine rotating member are rotated. It is formed in a relatively thin thickness of, for example, carbon or the like, within a range in which fluctuations in torque transmitted through the member 26 and the transmission 40 can be allowed, and lower than the strength of the rotor 32. The rotor 32 of the motor 30 and the motor rotation member 36 are formed on the inner peripheral side of the rotor 32 and have a length L2 shorter than the axial length L1 of the rotor 32 (for example, 2% or 5% of the length L1, A spline (groove) 32a having a length of about 10% and the like is spline-fitted with a spline 36a formed on the outer peripheral side of the rotating member 36 for an electric motor. As described above, when the motor rotating member 36 is replaced by spline fitting the rotor 32 of the motor 30 and the rotating member 36 for the motor, the replacement can be performed without removing the rotor 32 of the motor 30. It becomes possible. As a result, it is possible to easily change the design of the length of the rotating member 36 for the motor. In the embodiment, the splines 32a and 36a are set to a length L2 that is shorter than the axial length L1 of the rotor 32, so that torque fluctuations or motors output from the engine 22 and transmitted to the motor rotating member 36 can be obtained. 30 rotation fluctuations and the like can be absorbed by the rotating member 36 for the electric motor.

  The transmission 40 includes a plurality of rotating members including an input rotating member 42 to which power is input from the engine 22 and the motor 30, a clutch and a brake, and power input to the input rotating member 42 when the clutch is turned on / off. Can be shifted to 6 stages and output to the left and right rear wheels 60a, 60b. The input rotation member 42 is formed as a hollow cylindrical member, and the thickness D2 of the connection portion with the motor rotation member 36 is smaller than the thickness D1 of the connection portion with the engine rotation member 26. That is, it is formed so that the strength of the connection portion with the motor rotation member 36 is lower than the strength of the connection portion with the engine rotation member 26. The engine rotating member 26 and the input rotating member 42 are spline-fitted by a spline 26 a formed on the outer peripheral side of the engine rotating member 26 and a spline 42 a formed on the inner peripheral side of the input rotating member 42. The motor rotating member 36 and the input rotating member 42 are splined by a spline 36b formed on the outer peripheral side of the motor rotating member 36 and a spline 42b formed on the inner peripheral side of the input rotating member 42. It is mated. The connecting portion between the electric motor rotating member 36 and the input rotating member 42 is formed to have a lower strength than the rotor 32.

  In the hybrid vehicle 20 of the embodiment configured as described above, the intake air amount of the engine 22 is adjusted according to the depression amount of the accelerator pedal, the torque is output from the engine 22, and the electric power stored in the capacitor 50 is used. The motor 30 travels by outputting torque. In this case, torque fluctuation due to combustion explosion of the engine 22 is transmitted to the rotor 32 of the motor 30 via the damper 24, the engine rotary member 26, the input rotary member 42 of the transmission 40, and the motor rotary member 36. For this reason, since the fluctuation | variation of the torque output from the engine 22 and transmitted to the rotor 32 is suppressed compared with what connects the rotor of a motor to the output shaft of an engine directly, deterioration and breakage of the rotor 32 are suppressed more. be able to. In addition, in the embodiment, the strength of the connecting portion between the motor rotating member 36 or the motor rotating member 36 and the input rotating member 42 is lower than the strength of the rotor 32, so that the torque output from the engine 22 is reduced. When the fluctuation is large beyond the normally assumed range, the motor rotating member 36 or the connecting portion between the motor rotating member 36 and the input rotating member 42 is more easily damaged than the rotor 32 of the motor 30. Due to these breakage, breakage of the rotor 32 of the motor 30 can be further suppressed.

  According to the hybrid vehicle 20 of the embodiment described above, the rotor 32 of the motor 30 is connected to the input rotary member 42 connected to the engine 22 via the damper 24 and the engine rotary member 26 via the motor rotary member 36. By connecting, fluctuations in torque output from the engine 22 and transmitted to the rotor 32 are suppressed, and deterioration and breakage of the rotor 32 can be further suppressed. In addition, the strength of the torque output from the engine 22 can be reduced by reducing the strength of the motor rotating member 36 or the connecting portion of the motor rotating member 36 and the input rotating member 42 as compared to the strength of the rotor 32 of the motor 30. When the fluctuation is large beyond the normally assumed range, the breakage of the rotor 32 of the motor 30 is further suppressed by the breakage of the motor rotation member 36 or the connection portion between the motor rotation member 36 and the input rotation member 42. Can do.

  In the hybrid vehicle 20 of the embodiment, the spline 32a is formed on the inner peripheral side of the rotor 32 of the motor 30 and has a length L2 shorter than the axial length L1 of the rotor 32 and the outer peripheral side of the rotating member 36 for the motor. The spline 36a is used to spline-fit the rotor 32 of the motor 30 and the rotating member 36 for the motor, but is a cross-sectional view showing a partial cross section of the power output device 121 in the hybrid vehicle 120 of the modified example of FIG. As illustrated, a spline 132a formed on the entire inner periphery of the rotor 132 of the motor 130 and a spline 136a formed on the outer periphery of the rotating member 136 for the motor connect the rotor 132 and the rotating member 136 for the motor by spline fitting. It may be combined. Further, the rotor 32 of the motor 30 and the rotating member 36 for the electric motor may be integrated by welding or the like.

  In the hybrid vehicle 20 of the embodiment, the thickness D2 of the connection portion of the input rotation member 42 with the motor rotation member 36 is smaller than the connection portion thickness D1 of the input rotation member 42 with the engine rotation member 26. (The strength of the connection portion of the input rotation member 42 with the motor rotation member 36 is lower than the strength of the connection portion of the input rotation member 42 with the engine rotation member 26). The thickness (strength) may be substantially equal.

  In the hybrid vehicle 20 of the embodiment, the strength of the motor rotating member 36 and the connecting portion of the motor rotating member 36 and the input rotating member 42 are made lower than the strength of the rotor 32 of the motor 30. Only one of these may be made lower than the strength of the rotor 32 of the motor 30.

  In addition, it is not limited to those applied to such hybrid vehicles, but is incorporated into non-moving equipment such as forms of power output devices mounted on moving bodies such as vehicles other than automobiles, ships, and aircraft, and construction equipment. A power output device may be used.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the engine 22 corresponds to an “internal combustion engine”, the motor 30 corresponds to an “electric motor”, and the transmission 40 including the input rotation member 42 corresponds to “power transmission means”. Here, the “internal combustion engine” is not limited to an internal combustion engine that outputs power using a hydrocarbon-based fuel such as gasoline or light oil, but any type of engine that outputs power, such as a hydrogen engine. It may be an internal combustion engine. The “motor” is not limited to the motor 30 configured as a synchronous generator motor, and may be any type of motor as long as it can input and output power, such as an induction motor. The “power transmission means” is not limited to the transmission 40 including the input rotation member 42, but is a rotation member connected to the rotor of the engine and the rotor of the motor, which is a rotation member connected to the internal combustion engine. As long as it is connected to the rotating member for the electric motor and the drive shaft, and transmits the power from the internal combustion engine and the electric motor to the drive shaft, it does not matter. The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. It is an example for specifically explaining the best mode for doing so, and does not limit the elements of the invention described in the column of means for solving the problem. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention can be used in the manufacturing industry of power output devices and hybrid vehicles.

It is a block diagram which shows the outline of a structure of the hybrid vehicle 20 carrying the power output device 21 as one Example of this invention. 3 is a cross-sectional view showing a partial cross section of a power output device 21. FIG. It is sectional drawing which shows the one part cross section of the power output device 121 in the hybrid vehicle 120 of the modification.

Explanation of symbols

  20, 120 Hybrid vehicle, 21, 121 Power output device, 22 Engine, 24 Damper, 26 Engine rotating member, 30 Motor, 32 Rotor, 32a spline, 34 Stator, 36 Motor rotating member, 36a, 36b Spline, 38 Inverter , 40 Transmission, 42 Rotating member for input, 42a, 42b spline, 46 Drive shaft, 50 Capacitor, 60a, 60b Rear wheel, 130 Motor, 132 Rotor, 132a spline, 136 Motor rotating member, 136a spline.

Claims (6)

A power output device that outputs power to a drive shaft,
An internal combustion engine that outputs power;
An electric motor that inputs and outputs power;
An engine rotating member connected to the internal combustion engine and an electric motor rotating member connected to the rotor of the electric motor and the drive shaft are connected to the internal combustion engine and the electric motor. Power transmission means for transmitting power to the drive shaft;
With
The connecting portion between the rotating member for electric motor and / or the rotating member for electric motor and the power transmission means is formed with lower strength than the strength of the rotor,
Power output device.   2. The rotor and the rotating member for electric motor are formed by spline fitting a spline formed on the inner peripheral side of the rotor and a spline formed on the outer peripheral side of the rotating member for electric motor. Power output device.   The power output device according to claim 2, wherein the rotor has the spline formed on the inner peripheral side with a length shorter than the axial length of the rotor.   4. The power transmission means is a means having a predetermined rotating member in which a connecting portion with the rotating member for electric motor is formed with a lower strength than a connecting portion with the rotating member for engine. A power output apparatus according to any one of the preceding claims.   A hybrid vehicle comprising the power output device according to any one of claims 1 to 4 and having an axle connected to the drive shaft. A drive device that is incorporated with an internal combustion engine in a power output device that outputs power to a drive shaft,
An electric motor that inputs and outputs power;
An engine rotating member connected to the internal combustion engine and an electric motor rotating member connected to the rotor of the electric motor and the drive shaft are connected to the internal combustion engine and the electric motor. Power transmission means for transmitting power to the drive shaft;
With
The connecting portion between the rotating member for electric motor and / or the rotating member for electric motor and the power transmission means is formed with lower strength than the strength of the rotor,
Drive device.

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