JP2018168821A - Engine starting power generation unit - Google Patents

Abstract

To provide a configuration capable of having both functions of a starting motor and a generator and enlarging a start torque when starting an engine in an engine starting power generation unit.SOLUTION: An engine starting power generation unit includes a strange planetary gear mechanism which is disposed inside of a housing corresponding member and connected via clutch means between an input/output shaft and a motor shaft of a rotary electric machine. When transmitting a motive force for engine start from the motor shaft to the input/output shaft, the clutch means connects the input/output shaft with a first internal gear in such a manner that the input/output shaft is decelerated in a predetermined deceleration ratio relatively to the motor shaft by using the strange planetary gear mechanism and when transmitting a motive force for power generation from the input/output shaft to the motor shaft after the engine is started, the clutch means connects the input/output shaft with a carrier in such a manner that the motor shaft is accelerated in an acceleration ratio which is lower than a value of the deceleration ratio, relatively to the input/output shaft by using constituents in a part of the strange planetary gear mechanism.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an engine start power generation unit used for engine start and power generation in a state where power can be transmitted to the engine.

  2. Description of the Related Art Conventionally, work vehicles such as agricultural tractors for mounting an engine and performing lawn mowing work, tilling work, and the like are known. In such a work vehicle, the engine is started by a starter motor called a cell motor in accordance with the driver's operation of turning off the ignition switch. Further, after the engine is started, the engine drives the generator via a pulley, a belt, and the like.

  Patent Document 1 describes an electric machine and a planetary gear device that are used both as a starter motor (starting motor) for rotating an internal combustion engine or as a generator for supplying a voltage source of an automobile. A planetary gear device is disposed between the rotor of the electric machine and the planetary gear support shaft. The planetary gear device includes a sun gear fixed to the rotor, a planetary gear meshed with the sun gear and a hollow gear (outer gear), and a planetary gear support that supports the planetary gear. The hollow gear is switched at three positions in the circumferential direction, which are a first position, a second position, and a neutral position. In the first position, the hollow gear is pressed against the brake lining and locked. At this position, the rotational speed of the electric machine is reduced and a high moment is realized. In the second position, the hollow gear moves axially and is pressed against the planetary gear support and locked. At this time, the electric machine is driven at a high rotational speed, and a high electrical output is supplied. The hollow gear rotates freely in the neutral position, and the connection between the drive system of the automobile and the electric machine is interrupted.

Special table 2001-519504 gazette

  Mounting the starter motor and the generator on the vehicle is an obstacle to reducing the size and weight of the vehicle. In addition, the number of parts increases, which increases the cost. Further, depending on the type of engine such as a diesel engine, it may be desired to increase the starting torque, and it may be desired to start the engine with a large reduction ratio corresponding to a large torque from the starting motor. On the other hand, it is necessary to prevent the generator from being driven by the engine at a large speed increase ratio corresponding to the large speed reduction ratio from the aspect of effectively protecting the power generator.

  In the configuration described in Patent Document 1, the electric machine can have the functions of a starter motor and a generator, but there is room for improvement in terms of increasing the starting torque when starting the engine with the electric machine.

  An object of the present invention is to provide a configuration in which an engine starting power generation unit can have functions of both a starting motor and a generator and can increase a starting torque at the time of starting the engine.

  An engine start power generation unit according to the present invention is an engine start power generation unit used for starting and power generation of the engine in a state where power can be transmitted to the engine, the housing equivalent member, A rotating electrical machine fixed to the housing equivalent member and having a function as a start motor and a generator of the engine, and a connection portion rotatably supported inside the housing equivalent member and connected to the engine side member An input / output shaft and a strange planetary gear mechanism disposed inside the housing equivalent member and connected via a clutch means between the input / output shaft and the motor shaft of the rotating electrical machine. The mysterious planetary gear mechanism is arranged in parallel so as to have a first internal gear rotatably disposed inside the housing equivalent member and a central axis identical to the rotation axis of the gear. A second internal gear that is disposed so as not to rotate inside, a plurality of planetary gears meshed inside the first and second internal gears, and meshed inside the plurality of planetary gears, and synchronized with the motor shaft A rotating sun gear and a carrier that supports each of the plurality of planetary gears via a gear shaft so as to be capable of rotating. When the engine starting power is transmitted from the motor shaft to the input / output shaft, the clutch means uses the mysterious planetary gear mechanism so that the input / output shaft has a predetermined speed reduction compared to the motor shaft. When the input / output shaft and the first internal gear are connected so as to be decelerated at a ratio, and after the engine starts, power for power generation is transmitted from the input / output shaft to the motor shaft Further, the input / output shaft is configured so that the motor shaft is accelerated at a speed increasing ratio lower than the speed reduction ratio compared to the input / output shaft using a part of the components of the mysterious planetary gear mechanism. And the carrier.

  According to the engine starter power generation unit according to the present invention, it is possible to provide a configuration that can have both functions of a starter motor and a generator, and that can increase start torque at the time of engine start.

It is sectional drawing which shows the work vehicle containing the engine starting electric power generation unit of embodiment which concerns on this invention. It is the A section expansion equivalent view of Drawing 1 showing the engine unit containing the engine starting power generation unit of an embodiment. FIG. 3 is a partial cross-sectional view of an enlarged view of a portion B in FIG. 2. It is the C section expanded sectional view of Drawing 3 showing the engine starting power generation unit of an embodiment. In FIG. 4, it is a figure which shows the state which isolate | separated the rotary electric machine of an engine starting electric power generation unit, and parts other than a rotary electric machine. It is DD sectional drawing of FIG. It is an enlarged view of the center part of FIG. FIG. 5 is a view corresponding to FIG. 4 showing a power transmission path when engine starting power is transmitted from the motor shaft to the input / output shaft in the embodiment. FIG. 5 is a cross-sectional view taken along line EE of FIG. 4 showing a state in which the input / output shaft is rotated from the first internal gear via the first one-way clutch by the engine starting power in the embodiment. FIG. 5 is a view corresponding to FIG. 4 showing a power transmission path when power for power generation is transmitted from the input / output shaft to the motor shaft in the embodiment. FIG. 5 is a cross-sectional view taken along line FF in FIG. 4 illustrating a state in which the sun gear is rotated from the input / output shaft via the second one-way clutch by the power for power generation in the embodiment. It is sectional drawing which shows another example of the working vehicle containing the engine starting electric power generation unit of embodiment. It is the G section expanded sectional view of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the case where the front wheels and the rear wheels of the work vehicle are four-wheel drive vehicles that are rotationally driven by the power of the engine will be described. However, the work vehicle may include only the front wheels or those shown in FIGS. It may be a two-wheel drive vehicle in which only the rear wheels are driven by engine power as in the configuration. Further, the vehicle including the engine starting power generation unit may be a vehicle other than the work vehicle as long as the vehicle is driven and driven by the power of the engine.

  The shape, the number, the arrangement relationship of the components, etc. described below are examples for explanation, and can be appropriately changed according to the specifications of the vehicle and the engine starting power generation unit. In the following, similar elements are denoted by the same reference symbols in all drawings.

  FIG. 1 is a cross-sectional view showing a work vehicle 10 including an engine start power generation unit 20 of the embodiment. The work vehicle 10 can be driven by being equipped with various work machines (not shown) such as a rotary tiller as required.

  An engine unit 14 is fixed to the front side (left side in FIG. 1) of the frame 12 constituting the work vehicle 10. The engine unit 14 includes an engine 15 as a drive source, a power extraction unit 16, and an engine start power generation unit 20. Hereinafter, the engine start power generation unit 20 is referred to as a start power generation unit 20. The front axle drive device 100 is fixed to a portion of the frame 12 that is positioned below the engine 15. Two axles (not shown) of the front wheels 102 are connected to the left and right sides of the front axle drive device 100.

  A rear axle drive device 104 is fixed to the rear side of the frame 12. The axles (not shown) of the two rear wheels 106 are connected to the left and right sides of the rear axle drive device 104.

  FIG. 2 is an enlarged view corresponding to the portion A of FIG. 1 showing the engine unit 14. FIG. 3 is a partial cross-sectional view of the enlarged view of part B of FIG.

  The power take-out unit 16 includes a gear case 16 a that is fixed to the engine 15, a flywheel 17 that is accommodated in the gear case 16 a, a propulsion shaft 18, and a gear mechanism 19. The power of the output shaft 15 a (FIG. 3) of the engine 15 is transmitted to the propulsion shaft 18 via the flywheel 17.

  Returning to FIG. 1, the power transmitted to the propulsion shaft 18 is transmitted to the input shaft 105 of the rear axle drive device 104 via the first transmission shaft 107. The power transmitted to the input shaft 105 is transmitted to the input shaft 101 of the front axle drive device 100 via a transmission mechanism (not shown) inside the rear axle drive device 104 and the second transmission shaft 108. The The power transmitted to the input shaft 105 of the rear axle drive device 104 is shifted to a desired speed, and the axles of the left and right rear wheels 106 are passed through a differential gear mechanism (not shown) inside the rear axle drive device 104. Is transmitted to the rear wheel 106.

  The power transmitted to the input shaft 105 of the rear axle drive device 104 is also transmitted to the PTO shaft 109 as a work machine power take-out shaft supported by the rear portion of the rear axle drive device 104. The PTO shaft 109 is connected to a working machine such as a tiller so that power can be transmitted, and the PTO shaft 109 is driven to drive the working machine.

  The power transmitted to the input shaft 101 of the front axle drive device 100 is transmitted to the axles of the left and right front wheels 102 via a differential gear mechanism (not shown) inside the front axle drive device 100, and the front wheels 102 Drive.

  The engine 15 is covered with a bonnet 115, and a handle 116 is supported at the rear end of the bonnet 115. By operating the steering wheel 116, the front wheel 102 is steered, and thereby the direction of the vehicle is determined.

  In the frame 12, a seat 110 on which a driver sits is fixed behind the handle 116. Further, an accelerator pedal (not shown) is disposed on the front side of the seat 110. When the driver depresses the accelerator pedal and adjusts the amount of depression, the rotational speed of the engine 15 is adjusted. An ignition switch (not shown) is disposed in the vicinity of the handle 116.

  In the frame 12, a hydraulic cylinder 112 is supported below the seat 110. By the expansion and contraction of the hydraulic cylinder 112, the rear end portion of the elevating arm 114 is moved in the vertical direction, and the work implement supported by the rear end portion moves up and down. In addition, a working machine is not limited to a tilling machine, The work vehicle 10 can be equipped with the working machine according to a use. For example, when a work vehicle is used for lawn mowing work, a lawn mower is provided as a work machine.

  As shown in FIG. 3, the power transmitted to the propulsion shaft 18 in the power take-out unit 16 is transmitted to the input / output shaft 21 constituting the starter power generation unit 20 via a gear mechanism 19 including two gears 19 a and 19 b. Communicated.

  FIG. 4 is an enlarged cross-sectional view of a C portion in FIG. 3 showing the starting power generation unit 20. FIG. 5 is a diagram illustrating a state where the rotating electrical machine 22 of the starting power generation unit 20 and the portion other than the rotating electrical machine 22 are separated from each other in FIG. 4.

  The starting power generation unit 20 is used for starting the engine 15 and generating power while being connected to the engine 15 so that power can be transmitted. The starting power generation unit 20 includes a housing equivalent member 24, a rotating electrical machine 22, an input / output shaft 21, and a strange planetary gear mechanism 30.

  The housing equivalent member 24 corresponds to the case of the starter power generation unit 20. The gear-forming member 27 is sandwiched between the engine-side housing member 25 and the motor-side housing member 26, and the outer peripheral portions thereof are shared by common bolts 28. It is formed by screwing connection. In addition, you may make it join the member 25 and the member 27, and the member 26 and the member 27 with a separate volt | bolt, respectively. The gear forming member 27 is formed in a substantially cylindrical shape and forms an intermediate portion of the outer surface of the housing equivalent member 24. In the gear forming member 27, the tooth portion of the second internal gear 31 is formed directly on the inner peripheral surface which is the inner surface of the housing equivalent member 24 by machining. The gear 31 constitutes a part of a mysterious planetary gear mechanism 30 described later. The engine side housing member 25 has a center hole 25a through which an input / output shaft 21 described later is inserted. The motor side housing member 26 has a center hole 26a through which a motor shaft 23 of a rotating electrical machine 22 described later is inserted. The motor-side housing member 26 includes a stepped cylindrical tube portion 26 b that protrudes from the inner peripheral side end portion toward the inner space S side of the housing equivalent member 24.

  The rotating electrical machine 22 includes a case 22a, a motor shaft 23 rotatably supported inside the case 22a, a rotor (not shown) fixed to the motor shaft 23, and a stator (not shown) fixed inside the case 22a. Z)). The rotating electrical machine 22 has a structure of a DC motor driven by a direct current or an AC motor driven by an alternating current. For example, the rotating electrical machine 22 has a structure of a three-phase AC motor including a magnet rotor. The case 22a is coupled and fixed to the gear forming member 27 with the motor-side housing member 26 sandwiched between the bolts 22b in a state where the case 22a is in contact with the end surface opposite to the engine in the housing equivalent member 24. In this state, one end portion (left end portion in FIG. 4) of the motor shaft 23 protrudes from the case 22a to the housing equivalent member 24 side. The motor shaft 23 rotates in synchronization with the intermediate connecting member 50 by having one end thereof spline-engaged with the intermediate connecting member 50 rotatably supported by the housing equivalent member 24 as described later. As will be described later, the intermediate connecting member 50 rotates in synchronization with the sun gear 33 by being spline-engaged with the sun gear 33 constituting the mysterious planetary gear mechanism 30.

  The rotating electrical machine 22 functions as an engine starter motor and a generator. For example, when a three-phase alternating current is supplied from a battery (not shown) through a driver (not shown) which is a direct current alternating current converter by an artificial operation of an ignition switch (not shown), the rotating electric machine 22 is rotationally driven in one direction. At this time, the power of the rotating electrical machine 22 is transmitted to the output shaft 15a of the engine 15 through the mysterious planetary gear mechanism 30, the input / output shaft 21, the gear mechanism 19, and the flywheel 17 which will be described later. It is started. Thereby, the rotating electrical machine 22 functions as a starting motor for the engine 15. In addition, after the engine 15 is started, the power of the engine 15 is supplied to the motor shaft 23 of the rotating electrical machine 22 through some elements of the flywheel 17, the gear mechanism 19, the input / output shaft 21, and the second internal gear 31. The motor shaft 23 is rotationally driven. Thereby, the rotary electric machine 22 functions as a generator. The electric power generated by the rotating electrical machine 22 is supplied to the battery via the driver, so that the battery is charged.

  The input / output shaft 21 is rotatably supported inside the housing equivalent member 24. Specifically, the input / output shaft 21 includes a large-diameter cylindrical surface 21a at an axial intermediate portion, a small-diameter cylindrical surface 21b at one axial end portion (right end portion in FIG. 4), and an axial other end portion (in FIG. 4). And a small-diameter column portion 21c at the left end). Of the two gears 19a and 19b of the gear mechanism 19, a male spline portion 21d is formed on the small-diameter column portion 21c to be connected and fixed to the gear 19b on the starting power generation unit 20 side. At this time, the gear 19b corresponds to a member on the engine side, and the small diameter column portion 21c corresponds to a connection portion connected to the gear 19b. The input / output shaft 21 and the gear 19b may be connected by a key instead of a spline.

  The input / output shaft 21 is rotatably supported by a bearing 24b with a seal at one end portion (left end portion in FIG. 4) which is an end portion on the engine side of the housing equivalent member 24. The input / output shaft 21 is also rotatably supported by bearings inside a first internal gear 34 and a carrier 38 described later.

  The mysterious planetary gear mechanism 30 is disposed inside the housing equivalent member 24. The mysterious planetary gear mechanism 30 is connected between the input / output shaft 21 and the motor shaft 23 of the rotating electrical machine 22 via the clutch means 60. Specifically, the mysterious planetary gear mechanism 30 includes a second internal gear 31 formed directly on the gear forming member 27, a first internal gear 34, a plurality of planetary gears 39, a carrier 38, and a sun gear 33. It is comprised including.

  The first internal gear 34 is formed by connecting and fixing a housing fitting member 35 and a gear forming member 36. The housing fitting member 35 is connected to a cylindrical portion 35a having a cylindrical outer peripheral surface whose outer peripheral surface substantially coincides with the cylindrical inner peripheral surface of the housing equivalent member 24, and one end of the cylindrical portion 35a via an intermediate step portion 35b. And an outwardly facing flange 35c.

  The gear forming member 36 has an annular ring portion 36a and a gear portion 36b formed on the inner peripheral surface of the ring portion 36a. In a state where the ring portion 36a of the gear forming member 36 is overlapped with the flange 35c, the flange 35c and the ring portion 36a are screwed together by the bolt 37. Thereby, the 1st internal gear 34 is formed.

  6 is a cross-sectional view taken along the line DD of FIG. Between the joint surfaces of the housing fitting member 35 and the gear forming member 36, an oil passage 34a for lubricating oil circulation is formed. Specifically, grooves 34 b are formed at a plurality of positions on the inner surface facing the gear forming member 36 at different positions in the circumferential direction with respect to the bolt 37 at the lower end of the flange 35 c of the housing fitting member 35. Each groove 34b is formed from a position on the inner diameter side of the tooth bottom of the gear forming member 36 to a position reaching the outer peripheral surface of the flange 35c. An oil passage 34 a is formed by each groove 34 b and the surface of the gear forming member 36. As a result, the lubricating oil is sent from the lubricating oil pump 120 to the inside of the housing equivalent member 24 as will be described later, so that the lubricating oil accumulated inside the first internal gear 34 is quickly transferred to the first internal gear 34. Discharged to the outside. Lubricating oil that has flowed to the lower inner end of the housing equivalent member 24 outside the first internal gear 34 passes through a drain port 24a formed at the lower end of the housing equivalent member 24 to the external oil tank 122 (FIG. 4). So that the oil does not accumulate in the housing equivalent member 24.

  As shown in FIGS. 4 and 5, the first internal gear 34 is rotatably disposed inside the housing equivalent member 24 while being supported by a bearing. In addition, the first internal gear 34 is a portion formed by the gear forming member 36 so as to face one end surface in the axial direction of the gear forming member 27 (the left end surface in FIG. 4) via a slight gap. Adjacent to the internal gear 31, they are juxtaposed so as to have the same rotational axis as the central axis of the second internal gear 31. Thereby, the second internal gear 31 is arranged in parallel to the first internal gear 34 so as to have the same central axis as the rotation axis of the first internal gear 34.

  The plurality of planetary gears 39 are meshed inside both the gear portion 36 b of the first internal gear 34 and the second internal gear 31. For this reason, the length of each planetary gear 39 in the axial direction is set to a length that allows the gear portion 36 b and the second internal gear 31 to be engaged simultaneously. Each planetary gear 39 has a gear shaft 41 extending therethrough, and a bearing 42 such as a needle bearing is disposed between the gear shaft 41 and the planetary gear 39.

  The carrier 38 is substantially parallel to each other, and includes a first disc portion 38a and a second disc portion 38b each having a center hole, and a connecting portion 38c that connects the first and second disc portions 38a and 38b. . A cylindrical tube portion 38d is connected along the axial direction to an inner peripheral side end portion of the first disc portion 38a, and a small-diameter cylindrical surface 21b of the input / output shaft 21 is disposed inside the tube portion 38d. The Both end portions of the gear shaft 41 are supported by the first disc portion 38a and the second disc portion 38b. Accordingly, the carrier 38 supports each of the plurality of planetary gears 39 via the gear shaft 41 so as to be capable of rotating. A cylindrical tube portion 38e is connected to an inner peripheral end portion of the second disc portion 38b of the carrier 38 so as to protrude to one axial side (the right side in FIG. 4). The cylindrical portion 38e is rotatably supported by a bearing on the outer diameter side of the cylindrical portion 26b formed in the motor side housing member 26. Further, the other axial end (left end in FIG. 4) of the cylindrical portion 38d of the carrier 38 abuts against the step surface between the large-diameter cylindrical surface 21a and the small-diameter cylindrical surface 21b of the input / output shaft 21 via the disk member 51. It is done. The disc member 51 is made of metal or resin. When the disc member 51 is formed of a metal, it is preferable to apply an appropriate surface treatment or resin coating on the surface of the disc member 51 to improve slippage.

  The clutch means 60 has a first one-way clutch 61 and a second one-way clutch 62. The first one-way clutch 61 is disposed between the housing fitting member 35 and the input / output shaft 21. A bearing 40 is also disposed between the housing fitting member 35 and the input / output shaft 21. The first one-way clutch 61 is, for example, a roller type that includes a plurality of rollers and a spring. When the first internal gear 34 tends to rotate in one direction with respect to the input / output shaft 21, the first internal gear is used. 34 and the input / output shaft 21 are locked, and relative rotation between the first internal gear 34 and the input / output shaft 21 is prevented. On the other hand, the first one-way clutch 61 locks the first internal gear 34 and the input / output shaft 21 when the input / output shaft 21 tends to rotate in one direction with respect to the first internal gear 34. The first internal gear 34 and the input / output shaft 21 are allowed to rotate relative to each other. The first one-way clutch 61 is configured to connect the input / output shaft 21 and the first internal gear 34 when power for starting the engine is transmitted from the motor shaft 23 to the input / output shaft 21 as described later. Connect to rotate in sync.

  The second one-way clutch 62 is disposed between the inner peripheral surface of the cylindrical portion 38 d of the carrier 38 and the small-diameter cylindrical surface 21 b of the input / output shaft 21. A bearing 43 is also disposed between the inner peripheral surface of the cylindrical portion 38d and the small-diameter cylindrical surface 21b of the input / output shaft 21.

  The second one-way clutch 62 is, for example, a roller type like the first one-way clutch 61, and when the input / output shaft 21 tends to rotate in one direction with respect to the carrier 38, And the relative rotation between the input / output shaft 21 and the carrier 38 is prevented. On the other hand, when the carrier 38 tends to rotate in one direction with respect to the input / output shaft 21, the second one-way clutch 62 releases the lock between the carrier 38 and the input / output shaft 21 and inputs / outputs the carrier 38. Relative rotation with the shaft 21 is allowed. The second one-way clutch 62 synchronizes the input / output shaft 21 and the carrier 38 when power for power generation is transmitted from the input / output shaft 21 to the motor shaft 23 after the engine is started. Connect to rotate.

  FIG. 7 is an enlarged view of the central portion of FIG. The sun gear 33 is inserted into the inside of the carrier 38 through the cylindrical portion 38e and is rotatably arranged. The sun gear 33 includes a disc portion 33a and a shaft portion 33b that protrudes in the axial direction from one end surface (the right end surface in FIG. 7) of the disc portion 33a. A gear portion 33 c is formed on the outer peripheral surface of the disc portion 33 a, and the gear portion 33 c is engaged with the inside of the plurality of planetary gears 39. A male spline portion 33d is formed on the outer peripheral surface of the shaft portion 33b, and the male spline portion 33d is spline engaged with the intermediate connecting member 50. Thereby, the sun gear 33 rotates in synchronization with the intermediate connecting member 50 and the motor shaft 23 (FIG. 4). The sun gear 33 includes an annular sleeve 44 having an L-shaped cross section that is attached to the axial end surface of the cylindrical portion 38d of the carrier 38, a retaining ring 45 and a disc member that are engaged with the inner peripheral surface of the second disc portion 38b. 46 restricts the movement and posture in the axial direction. The sleeve 44 and the disk member 46 are made of metal or resin. When the sleeve 44 and the disk member 46 are formed of metal, it is preferable to apply an appropriate surface treatment or resin coating on the surface facing the sun gear 33 to improve sliding. The sun gear 33 is allowed to be slightly inclined and displaced with respect to the rotation axis of the motor shaft 23 in a spline engagement with the intermediate connecting member 50. Thus, it is possible to distribute the load equally, and the sun gear 33 can absorb some manufacturing errors and assembly errors of the respective components of the mysterious planetary gear mechanism 30.

  The intermediate connecting member 50 has a cylindrical shape, and a partition portion 50a is formed in an inner axial direction intermediate portion. The partition portion 50a blocks the inner spaces on both sides in the axial direction of the intermediate connecting member 50 without communicating with each other. The oil seal 52 is an oil seal for filling a gap between the outer periphery of the intermediate connecting member 50 and the inner periphery of the cylindrical portion 26 b formed in the motor side housing member 26.

  The first internal gear 34, the second internal gear 31, and the sun gear 33 are all subjected to carburizing and finishing. For example, the first internal gear 34 and the second internal gear 31 are subjected to carburizing treatment and honing as finishing. In addition, the sun gear 33 is subjected to, for example, carburizing treatment and tooth polishing as finishing. “Honing” means that a grinding wheel having the shape of an external gear or an internal gear is meshed with a finish object, and the tooth surface to be finished is ground while rotating. “Dental” means that the tooth surface is ground with a grindstone rotating at high speed. Thereby, the strength of the first internal gear 34, the second internal gear 31, and the sun gear 33 can be improved, the friction at the time of meshing can be reduced, energy loss and heat generation can be reduced, and quietness can be improved. .

  Next, an oil path for supplying lubricating oil to the internal space S of the housing equivalent member 24 will be described. As shown in FIG. 4, an oil supply port P <b> 1 is formed in the engine-side housing member 25 of the housing equivalent member 24. A discharge port of the lubricating oil pump 120 is connected to the oil supply port P1 through an oil passage L1. As shown in FIG. 2, the lubricating oil pump 120 is attached to the engine 15 and is driven by the engine 15 via a gear mechanism that is interlocked with the output shaft of the engine 15 to suck up the lubricating oil from the oil tank unit 122. .

  The lubricating oil sent to the oil supply port P1 passes through oil passages L2, L3, L4, and L5 formed in the first internal gear 34, the input / output shaft 21, the gear shaft 41, and the sun gear 33, respectively. The unidirectional clutches 61 and 62 and the rotating parts of the mysterious planetary gear mechanism 30 are supplied. Further, as described above, the lubricating oil accumulated in the space inside the first internal gear 34 is discharged to the outside of the first internal gear 34 through the oil passage 34 a formed in the first internal gear 34. The At this time, since the carrier 38 and the first internal gear 34 rotate, a centrifugal pump effect is produced, and the lubricating oil in the oil passage L4 of the planetary gear 39 and the lubricating oil inside the first internal gear 34 are used as the first internal gear. At the same time, the centrifugal pump effect assuredly lubricates the first and second one-way clutches 61 and 62 by sucking the lubricating oil in the oil passages L3 and L2 inward of the case. Can do. Then, the lubricating oil is discharged from the drain port 24 a formed at the lower end portion of the housing equivalent member 24 to the external oil tank portion 122. Further, the lubricating oil supplied from the lubricating oil pump 120 to the inside of the housing equivalent member 24 lubricates the clutch means 60 and the strange planetary gear mechanism 30, and the lubricating oil is quickly discharged from the internal space S after lubrication. It is. Thereby, it is possible to suppress that the lubricating oil accumulated inside the housing equivalent member 24 becomes a rotational resistance of the member rotating inside the housing equivalent member 24.

  Further, as described above, the inner side of the intermediate coupling member 50 serving as the connecting portion of the motor shaft 23 is partitioned by the partition portion 50 a and the outer side is partitioned by the oil seal 52. As a result, as shown in FIG. 5, an oil-tight state is maintained between the rotating electrical machine 22 and the housing equivalent member 24, and oil is prevented from entering the rotating electrical machine 22 side.

  Since the starting power generation unit 20 is configured as described above, the first one-way clutch 61 transmits unidirectional power for starting the engine from the first internal gear 34 side to the input / output shaft 21 side. The input / output shaft 21 and the first internal gear 34 are connected so as to rotate in synchronization. On the other hand, when the first one-way clutch 61 tends to transmit unidirectional power from the input / output shaft 21 side to the first internal gear 34 side, the input / output shaft 21 and the first internal gear 34 are used. The connection is broken so that the and are rotated relative to each other. Thus, the first one-way clutch 61 connects the input / output shaft 21 and the first internal gear 34 only when the engine starting power is transmitted from the motor shaft 23 to the input / output shaft 21.

  FIG. 8 is a diagram corresponding to FIG. 4 showing a power transmission path when engine starting power is transmitted from the motor shaft 23 to the input / output shaft 21 in the embodiment. 9 shows a state where the input / output shaft 21 is rotated from the first internal gear 34 via the first one-way clutch 61 by the power for starting the engine in the embodiment. It is sectional drawing.

  When power for starting the engine is transmitted from the motor shaft 23 to the input / output shaft 21, the mysterious planetary gear mechanism 30 is used to decelerate the input / output shaft 21 at a predetermined reduction ratio H1 compared to the motor shaft 23. As described above, the input / output shaft 21 and the first internal gear 34 are connected. At this time, as indicated by an arrow α in FIG. 8, the power of the motor shaft 23 is obtained from the intermediate connecting member 50, the sun gear 33, the planetary gear 39, the first internal gear 34, the first one-way clutch 61, and the input / output shaft 21. It is transmitted in order. At this time, since power is transmitted in the order of the sun gear 33, the planetary gear 39, and the first internal gear 34 of the mysterious planetary gear mechanism 30, at a large reduction ratio, for example, a reduction ratio H1 of an arbitrary value of 50 to 100, The input / output shaft 21 is decelerated with respect to the motor shaft 23.

  On the other hand, the second one-way clutch 62 rotates in synchronization with the input / output shaft 21 and the carrier 38 when unidirectional power generation is started from the input / output shaft 21 side to the carrier 38 side. Connect to let them. On the other hand, when the one-way power tends to be transmitted from the carrier 38 side to the input / output shaft 21 side, the second one-way clutch 62 is connected to rotate the input / output shaft 21 and the carrier 38 relative to each other. Shut off. Thus, the second one-way clutch 62 connects the input / output shaft 21 and the carrier 38 only when power for power generation is transmitted from the input / output shaft 21 to the motor shaft 23 after the engine 15 is started. To do.

  FIG. 10 is a diagram corresponding to FIG. 4 showing a power transmission path when power for power generation is transmitted from the input / output shaft 21 to the motor shaft 23 in the embodiment. 11 is a cross-sectional view taken along the line FF of FIG. 4 showing a state in which the sun gear 33 is rotated from the input / output shaft 21 via the second one-way clutch 62 by the power for power generation in the embodiment.

  When power for power generation is transmitted from the input / output shaft 21 to the motor shaft 23 after the engine starts, the motor shaft 23 has a speed increase ratio lower than the speed ratio H1 compared to the input / output shaft 21. The input / output shaft 21 and the carrier 38 are connected so as to be accelerated at H2. At this time, the power of the input / output shaft 21 is transmitted in the order of the second one-way clutch 62, the carrier 38, the planetary gear 39, the sun gear 33, the intermediate connecting member 50, and the motor shaft 23 as indicated by an arrow β in FIG. . In this case, the motor shaft 23 is accelerated with respect to the input / output shaft 21 by using the carrier 38, the planetary gear 39, the second internal gear 31, and the sun gear 33 as some components of the mysterious planetary gear mechanism 30. At this time, since the first internal gear 34 freely rotates, it does not substantially affect the operation of obtaining the speed increasing ratio, and the mysterious planetary gear mechanism 30 is substantially a general planetary gear that is not the mysterious planetary gear mechanism 30. Acts as a mechanism. As a result, an acceleration ratio H2 having an arbitrary value of 3 to 5 or the like is obtained as the acceleration ratio H2 lower than the value of the reduction ratio H1.

  Therefore, according to the starting power generation unit 20 described above, the functions of both the starting motor and the generator can be provided, and the large reduction ratio of the mysterious planetary gear mechanism 30 is used to increase the starting torque when starting the engine. it can. In particular, the effect of the present embodiment becomes significant when using an engine that is more desirable to increase the starting torque, such as a diesel engine.

  Further, since the housing equivalent member 24 includes a gear forming member 27 that forms the outer surface of the housing equivalent member 24 and the second internal gear 31 is directly formed, the number of parts can be reduced and the cost can be reduced. Can be planned. The embodiment is not limited to the case where the housing equivalent member 24 includes such a gear forming member 27. For example, the housing equivalent member 24 includes an outer member forming the outer surface of the housing equivalent member 24 and an inner member on which the second internal gear is formed as different members, and the outer and inner members are coupled and fixed by bolts or the like. It is good also as the structure which carried out.

  In the above embodiment, the case where the starting power generation unit 20 is fixed to the gear case 16 a and the starting power generation unit 20 is disposed near the engine 15 has been described. At this time, the starting power generation unit 20 may be directly fixed to the engine 15. On the other hand, the startup power generation unit 20 may be arranged such that the startup power generation unit 20 is fixed to the transmission case 70 and is far away from the engine 15 as in another configuration described below.

  FIG. 12 is a cross-sectional view illustrating another example of the work vehicle 10a including the starter power generation unit 20 of the embodiment. FIG. 13 is an enlarged cross-sectional view of a portion G in FIG.

  In another example of the work vehicle 10a shown in FIGS. 12 and 13, unlike the work vehicle 10 shown in FIG. 1 and the like, a transmission case 70 that also serves as a body frame is fixed to the rear end portion of the engine 15. Inside the transmission case 70 are a flywheel 17, a first clutch 71, a rear wheel power transmission unit 72, a transmission unit 74, a differential gear mechanism 76, a gear mechanism 78, a second clutch 80, a PTO shaft power transmission unit 82, Is placed. The power from the engine 15 is transmitted to the axles of the left and right rear wheels 106 via the main shaft 84 fixed to the flywheel 17, the first clutch 71, the rear wheel power transmission unit 72, and the differential gear mechanism 76. At this time, it is possible to switch the shift stage of the transmission unit 74 by operating a shift lever (not shown) by the driver.

  The power from the engine 15 can be transmitted to the PTO shaft 109 supported by the rear end portion of the transmission case 70 via the main shaft 84, the second clutch 80 and the PTO shaft power transmission portion 82. The power transmitted to the PTO shaft 109 can drive a working machine (not shown) such as a tiller. Further, the starting power generation unit 20 is fixed to the upper part of the rear end portion of the transmission case 70, and the input / output shaft 21 of the starting power generation unit 20 protrudes rearward from the housing equivalent member 24 to constitute a gear mechanism 78. It is fixedly coupled to the gear of the part. Thereby, the power from the engine 15 is transmitted to the input / output shaft 21 of the starting power generation unit 20 via the main shaft 84 and the gear mechanism 78, and the rotating electrical machine 22 of the starting power generation unit 20 can function as a generator. Further, by operating the rotating electrical machine 22 of the starting power generation unit 20 as a motor, the power of the rotating electrical machine 22 can be transmitted to the engine 15 via the gear mechanism 78 and the main shaft 84 to start the engine 15. Other configurations and operations are the same as those shown in FIGS.

  10, 10a Work vehicle, 12 frame, 14 engine unit, 15 engine, 15a output shaft, 16 power take-out part, 16a gear case, 17 flywheel, 18 propulsion shaft, 19 gear mechanism, 20 engine start power generation unit (start power generation unit) , 21 I / O shaft, 21a Large-diameter cylindrical surface, 21b Small-diameter cylindrical surface, 21c Small-diameter column portion, 21d Male spline portion, 22 Rotating electrical machine, 22a Case, 22b Bolt, 23 Motor shaft, 24 Housing equivalent member, 24a Drain port, 24b bearing, 25 engine side housing member, 25a center hole, 26 motor side housing member, 26a center hole, 26b cylinder, 27 gear forming member, 28 bolt, 30 mysterious planetary gear mechanism, 31 second internal gear, 33 sun gear 33a yen Part, 33b shaft part, 33c gear part, 33d male spline part, 34 first internal gear, 34a oil passage, 34b groove, 35 housing fitting member, 35a cylinder part, 35b intermediate step part, 35c flange, 36 gear formation Member, 36a ring part, 36b gear part, 37 bolt, 38 carrier, 38a first disk part, 38b second disk part, 38c connecting part, 38d cylinder part, 39 planetary gear, 40 bearing, 41 gear shaft, 42, 43 Bearing, 44 Sleeve, 45 Retaining ring, 46 Disc member, 50 Intermediate connecting member, 50a Partition, 51 Disc member, 52 Oil seal, 60 Clutch means, 61 First one-way clutch, 62 Second one-way clutch , 70 Transmission case, 72 Rear wheel power transmission unit, 74 Transmission unit, 76 Differential gear mechanism 78 Gear mechanism, 80 Second clutch, 82 PTO shaft power transmission unit, 84 Main shaft, 100 Front axle drive device, 101 Input shaft, 102 Front wheel, 104 Rear axle drive device, 105 Input shaft, 106 Rear wheel, 107 First electric drive Shaft, 108 second transmission shaft, 109 PTO shaft, 110 seat, 112 hydraulic cylinder, 114 lifting arm, 115 bonnet, 116 handle, 120 lubricating oil pump, 122 oil tank section.

Claims (5)

An engine starting power generation unit used for starting and power generation of the engine in a state where power can be transmitted to the engine,
A housing equivalent member;
A rotating electrical machine fixed to the housing equivalent member and having a function as a starting motor and a generator of the engine;
An input / output shaft having a connection portion rotatably supported inside the housing equivalent member and connected to the engine side member;
A magic planetary gear mechanism disposed inside the housing equivalent member and connected via a clutch means between the input / output shaft and the motor shaft of the rotating electrical machine;
The mysterious planetary gear mechanism is
A first internal gear rotatably disposed inside the housing equivalent member;
A second internal gear which is arranged in parallel so as to have the same central axis as the rotational axis of the gear and is disposed in a non-rotatable manner inside the housing equivalent member, the first internal gear and the second internal gear A plurality of planetary gears meshed inside,
A sun gear meshed with the inside of the plurality of planetary gears and rotating in synchronization with the motor shaft;
A carrier that supports each of the plurality of planetary gears so as to be capable of rotating via a gear shaft;
The clutch means includes
When the engine starting power is transmitted from the motor shaft to the input / output shaft, the mysterious planetary gear mechanism is used to reduce the input / output shaft at a predetermined reduction ratio compared to the motor shaft. Connecting the input / output shaft and the first internal gear,
When power for power generation is transmitted from the input / output shaft to the motor shaft after the engine starts, using some of the components of the mysterious planetary gear mechanism, compared to the input / output shaft An engine starting power generation unit that connects the input / output shaft and the carrier so that the motor shaft is accelerated at a speed increasing ratio lower than the speed reduction ratio. The engine starting power generation unit according to claim 1,
The clutch means includes
The input / output shaft and the first internal gear are arranged between the input / output shaft and the first internal gear, and when power is transmitted from the first internal gear side to the input / output shaft side. The input / output shaft and the first internal gear when the power is transmitted from the input / output shaft side to the first internal gear side. A first one-way clutch that disconnects the connection so as to relatively rotate
It is disposed between the input / output shaft and the carrier, and is connected to rotate the input / output shaft and the carrier in synchronization when power is transmitted from the input / output shaft side to the carrier side. A second one-way clutch that cuts off the connection so that the input / output shaft and the carrier rotate relative to each other when power tends to be transmitted from the carrier side to the input / output shaft side. , Engine starting power generation unit. The engine starting power generation unit according to claim 1 or 2,
The engine starting power generation unit, wherein the housing equivalent member includes a gear forming member that forms an outer surface of the housing equivalent member and in which the second internal gear is directly formed. The engine starting power generation unit according to any one of claims 1 to 3,
The internal space of the housing equivalent member is connected to a lubricating oil pump,
An engine in which lubricating oil supplied from the lubricating oil pump to the inside of the housing equivalent member lubricates the clutch means and the strange planetary gear mechanism, and the lubricating oil is discharged from the internal space after lubrication. Starting power generation unit. The engine starting power generation unit according to any one of claims 1 to 4,
The engine starting power generation unit, wherein the first internal gear, the second internal gear, and the sun gear are carburized and finished.