Work machine, and electric power train unit for work machine

Abstract

To make a vehicle body compact in a work machine equipped with a plurality of electric motors.SOLUTION: A work machine includes a vehicle body, a traveling device, a work device, and an electric power train unit. The electric power train unit drives the traveling device and the work machine. The electric power train unit includes a transmission, a first electric motor for the traveling device, a bracket, and a second electric motor for the work device. The transmission includes an input shaft, an output shaft, and a housing. The output shaft is connected to the traveling device. The housing accommodates the input shaft and the output shaft. The first electric motor includes a first output shaft and is attached to the housing. The first output shaft is connected to the input shaft. The bracket is attached to the housing. The second electric motor is attached to the bracket and supported by the housing via the bracket.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a work machine and an electric power train unit for a work machine.

Background Art

[0002] Some work machines include a traveling device and a working device. The traveling device includes, for example, tires or crawlers. When the traveling device is driven, the work machine travels. The working device includes, for example, a working tool such as a bucket. When the working device is driven, the work machine performs operations such as excavation. In recent years, an electric motor has been used as a drive source for driving the traveling device and the working device. For example, the work machine of Patent Document 1 includes a first electric motor for driving the traveling device and a second electric motor for driving the working device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above work machine, a large space is required to arrange the first electric motor and the second electric motor in the vehicle body. Therefore, the vehicle body becomes large. In addition, structures for attaching the first electric motor and the second electric motor to the vehicle body are required respectively. Therefore, it is preferable to appropriately arrange the first electric motor and the second electric motor. An object of the present disclosure is to reduce the size of the vehicle body in a work machine including a plurality of electric motors.

Means for Solving the Problems

[0005] A working machine according to one aspect of the present disclosure includes a vehicle body, a traveling device, a working implement, and an electric power train unit. The traveling device is attached to the vehicle body and causes the vehicle body to travel. The working implement is movably connected to the vehicle body. The electric power train unit drives the traveling device and the working machine. The electric power train unit includes a transmission, a first electric motor for the traveling device, a bracket, and a second electric motor for the working implement. The transmission includes an input shaft, an output shaft, and a housing. The output shaft is connected to the traveling device. The housing houses the input shaft and the output shaft. The first electric motor includes a first output shaft and is attached to the housing. The first output shaft is connected to the input shaft. The bracket is attached to the housing. The second electric motor is attached to the bracket and supported by the housing via the bracket.

[0006] An electric power train unit for a working machine according to another aspect of the present disclosure includes a transmission, a first electric motor, a bracket, a second electric motor, and a hydraulic pump. The transmission includes an input shaft, an output shaft, and a housing. The housing houses the input shaft and the output shaft. The first electric motor includes a first output shaft and is attached to the housing. The first output shaft is connected to the input shaft. The bracket is attached to the housing. The second electric motor includes a second output shaft, is attached to the bracket, and is supported by the housing via the bracket. The hydraulic pump is connected to the second output shaft.

Advantages of the Invention

[0007] According to the present disclosure, the first electric motor is attached to the housing of the transmission, and the second electric motor is attached to the housing of the transmission via a bracket. Thereby, the first electric motor, the second electric motor, and the transmission are unitized as an electric power train unit. Therefore, the first electric motor and the second electric motor can be arranged compactly. In addition, the structures for attaching the first electric motor and the second electric motor to the vehicle body become unnecessary or are miniaturized respectively. Thereby, in the working machine, the vehicle body can be miniaturized.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

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Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a working machine 1 according to an embodiment of the present disclosure. The working machine 1 according to the present embodiment is an electric wheel loader. As shown in FIG. 1, the working machine 1 includes a vehicle body 2, a working machine 5, and a traveling device 6.

[0010] The vehicle body 2 includes a front vehicle body 3 and a rear vehicle body 4. The rear vehicle body 4 is connected to the front vehicle body 3 so as to be rotatable left and right. A driver's cab 7, a hydraulic oil tank 8, and a power chamber 9 are arranged on the rear vehicle body 4. The hydraulic oil tank 8 is arranged behind the driver's cab 7. The power chamber 9 is arranged behind the hydraulic oil tank 8. A steering cylinder 15 is connected between the front vehicle body 3 and the rear vehicle body 4. The steering cylinder 15 is a hydraulic cylinder. By the expansion and contraction of the steering cylinder 15, the front vehicle body 3 rotates left and right with respect to the rear vehicle body 4.

[0011] The traveling device 6 is attached to the vehicle body 2. The traveling device 6 makes the working machine 1 travel. FIG. 2 is a block diagram showing the configuration of a drive system 10 mounted on the working machine 1. As shown in FIGS. 1 and 2, the traveling device 6 includes front wheels 16A, 16B and rear wheels 17A, 17B. The front wheels 16A, 16B are rotatably supported by the front vehicle body 3. The rear wheels 17A, 17B are rotatably supported by the rear vehicle body 4.

[0012] The working machine 5 is movably connected to the vehicle body 2. The working machine 5 is used for operations such as excavation. The working machine 5 is attached to the front vehicle body 3. The working machine 5 includes a boom 11, a bucket 12, a boom cylinder 13, and a bucket cylinder 14. The boom cylinder 13 and the bucket cylinder 14 are hydraulic cylinders. When the boom cylinder 13 expands and contracts, the boom 11 operates. When the bucket cylinder 14 expands and contracts, the bucket 12 operates.

[0013] As shown in FIG. 2, the drive system 10 includes a battery 21, a power control circuit 22, a first electric motor 23, and a second electric motor 24. The first electric motor 23 includes a first output shaft 231. The second electric motor 24 includes a second output shaft 241. The battery 21 supplies power to the first electric motor 23 and the second electric motor 24. As shown in FIG. 1, the battery 21 is disposed in the power chamber 9.

[0014] The power control circuit 22 controls the power supplied to the first electric motor 23 and the second electric motor 24. The power control circuit 22 includes, for example, an inverter. The first electric motor 23 generates a driving force for driving the traveling device 6. The second electric motor 24 generates a driving force for driving the working machine 5.

[0015] The drive system 10 includes a hydraulic pump 25 and a control valve 26. The hydraulic pump 25 is a variable displacement type hydraulic pump. The hydraulic pump 25 is connected to the second output shaft 241 of the second electric motor 24. The hydraulic pump 25 is driven by the second electric motor 24 to supply hydraulic oil to the above-described hydraulic cylinders 13 - 15. The control valve 26 is connected to the hydraulic pump 25 and the hydraulic cylinders 13 - 15 via a hydraulic circuit. The control valve 26 includes a plurality of valves. The control valve 26 controls the flow rate of the hydraulic oil supplied from the hydraulic pump 25 to the hydraulic cylinders 13 - 15.

[0016] The above-described traveling device 6 includes a drive shaft 27, a front axle 28, and a rear axle 29. The drive shaft 27 is connected to the front axle 28 and the rear axle 29. The front wheels 16A and 16B are connected to the drive shaft 27 via the front axle 28. The rear wheels 17A and 17B are connected to the drive shaft 27 via the rear axle 29.

[0017] The drive system 10 includes a transmission 31. The transmission 31 includes an input shaft 32, a speed-changing gear set 33, and an output shaft 34. The input shaft 32 of the transmission 31 is connected to the first output shaft 231 of the first electric motor 23. The speed-changing gear set 33 includes a plurality of speed-changing gears and is connected to the input shaft 32 and the output shaft 34. The output shaft 34 of the transmission 31 is connected to the drive shaft 27 of the traveling device 6. The transmission 31 changes the driving force from the first electric motor 23 and transmits it to the traveling device 6.

[0018] In the working machine 1 according to the present embodiment, the above-described transmission 31, the first electric motor 23, the second electric motor 24, and the hydraulic pump 25 are integrated with each other as an electric power train unit 30. As shown in FIG. 1, the electric power train unit 30 is mounted on the vehicle body 2. The electric power train unit 30 is disposed below the driver's cab 7.

[0019] FIG. 3 is a perspective view of the electric power train unit 30. FIG. 4 is a side view of the electric power train unit 30. FIG. 5 is a top view of the electric power train unit 30. FIG. 6 is an exploded perspective view of the electric power train unit 30. As shown in FIGS. 3 to 6, the transmission 31 includes a transmission housing 35. The transmission housing 35 houses the above-described input shaft 32, output shaft 34, and speed-changing gear set 33.

[0020] The transmission housing 35 includes an upper housing portion 36 and a lower housing portion 37. As shown in FIG. 3, an input shaft 32 is disposed within the upper housing portion 36. An output shaft 34 is disposed in the lower housing portion 37. The upper housing portion 36 is smaller than the lower housing portion 37 in the vehicle front-rear direction. The front surface 361 of the upper housing portion 36 is located rearward of the front surface 371 of the lower housing portion 37. The lower housing portion 37 includes an upper surface 372. The upper surface 372 of the lower housing portion 37 extends forward from the front surface 361 of the upper housing portion 36.

[0021] The first electric motor 23 includes a first motor housing 232. The first motor housing 232 houses a first output shaft 231. The first electric motor 23 is attached to the transmission housing 35. The first electric motor 23 is attached to the front surface 361 of the upper housing portion 36. The first motor housing 232 includes a first motor fixing portion 233. The first motor housing 232 is fixed to the transmission housing 35 at the first motor fixing portion 233. The first motor fixing portion 233 has a flange-like shape. The first motor fixing portion 233 is fixed to the transmission housing 35 by a fixing member such as a bolt.

[0022] The electric power train unit 30 includes a motor bracket 40. The motor bracket 40 is separate from the transmission 31 and the second electric motor 24. The motor bracket 40 is attached to the transmission housing 35. The motor bracket 40 is detachably attached to the transmission housing 35 by a fixing member such as a bolt. The second electric motor 24 is attached to the motor bracket 40. The second electric motor 24 is supported by the transmission housing 35 via the motor bracket 40.

[0023] Figures 7 and 8 are perspective views of the transmission 31 and the motor bracket 40. Figure 9 is a rear view of the transmission 31 and the motor bracket 40. As shown in FIGS. 7 to 9, the motor bracket 40 includes a bracket main body 41, a first bracket fixing portion 42, and a second bracket fixing portion 43.

[0024] The bracket main body 41 is a portion to which the second electric motor 24 is attached. The bracket main body 41 has a plate-like shape. The bracket main body 41 has a substantially circular shape. As shown in FIG. 9, the upper end 411 of the bracket main body 41 is located above the upper end 351 of the transmission housing 35. The lower end 412 of the bracket main body 41 is located below the upper end 351 of the transmission housing 35. The bracket main body 41 includes an opening 44. The opening 44 penetrates the bracket main body 41 in the vehicle front-rear direction.

[0025] The first bracket fixing portion 42 and the second bracket fixing portion 43 are connected to the bracket main body 41. The first bracket fixing portion 42 extends laterally from the bracket main body 41. The second bracket fixing portion 43 extends downward from the bracket main body 41. The motor bracket 40 is fixed to the transmission housing 35 at the first bracket fixing portion 42 and the second bracket fixing portion 43.

[0026] The transmission housing 35 includes a first transmission fixing portion 38 and a second transmission fixing portion 39. The first transmission fixing portion 38 is connected to the upper housing portion 36. As shown in FIGS. 7 and 9, the first transmission fixing portion 38 is disposed on the upper surface 362 of the upper housing portion 36. The first bracket fixing portion 42 is fixed to the first transmission fixing portion 38. The second transmission fixing portion 39 is connected to the lower housing portion 37. The second transmission fixing portion 39 is disposed on the upper surface 372 of the lower housing portion 37. The second bracket fixing portion 43 is fixed to the second transmission fixing portion 39.

[0027] The second electric motor 24 includes a second motor housing 242. The second motor housing 242 houses a second output shaft 241. The second electric motor 24 is detachably attached to the bracket main body 41. The second electric motor 24 is attached to the bracket main body 41 from the front of the bracket main body 41. The second motor housing 242 includes a second motor fixing portion 243. The second motor fixing portion 243 has a flange-like shape. The second motor housing 242 is fixed to the transmission housing 35 at the second motor fixing portion 243. The second motor fixing portion 243 is fixed to the transmission housing 35 by a fixing member such as a bolt.

[0028] As shown in FIGS. 4 and 5, in the electric power train unit 30, the first electric motor 23 is attached to the transmission housing 35 and the second electric motor 24 is attached to the transmission housing 35 via the motor bracket 40 so that the first output shaft 231 and the second output shaft 241 are arranged in parallel with each other.

[0029] Further, the hydraulic pump 25 is attached to the second electric motor 24. The hydraulic pump 25 is not attached to the motor bracket 40 and is supported by the motor bracket 40 via the second electric motor 24. However, the hydraulic pump 25 may be attached to the motor bracket 40.

[0030] The hydraulic pump 25 is arranged coaxially with the second electric motor 24. The motor bracket 40 is arranged between the hydraulic pump 25 and the second electric motor 24. The hydraulic pump 25 and the second electric motor 24 are arranged through an opening 44. The hydraulic pump 25 is arranged behind the motor bracket 40. The second electric motor 24 is arranged in front of the motor bracket 40.

[0031] The second electric motor 24 is arranged on the same side of the transmission 31 as the first electric motor 23 in the vehicle longitudinal direction. The hydraulic pump 25 is arranged on the side opposite to the first electric motor 23 and the second electric motor 24 with respect to the transmission 31 in the vehicle longitudinal direction. That is, the first electric motor 23 and the second electric motor 24 are arranged in front of the transmission 31. The hydraulic pump 25 is arranged behind the transmission 31.

[0032] The first electric motor 23 and the second electric motor 24 are arranged close to each other. As shown in FIG. 4, in a side view of the vehicle, the first electric motor 23 and the second electric motor 24 are arranged one above the other. In a side view of the vehicle, the upper surface 244 of the second electric motor 24 is located above the upper surface 234 of the first electric motor 23. In a side view of the vehicle, the first electric motor 23 and the second electric motor 24 at least partially overlap each other. As shown in FIG. 5, in a top view of the vehicle, the first electric motor 23 and the second electric motor 24 are arranged side by side. In a top view of the vehicle, the first electric motor 23 and the second electric motor 24 at least partially overlap each other.

[0033] As shown in FIG. 3, the electric power train unit 30 is attached to the vehicle body 2 via mount brackets 51, 52. The mount brackets 51, 52 are attached to the transmission housing 35. The mount brackets 51, 52 include mount members 53, 54 made of an elastic body. The electric power train unit 30 is supported by the vehicle body 2 via the mount members 53, 54.

[0034] FIG. 10 is a side view showing the electric power train unit 30 mounted on the vehicle body 2. FIG. 11 is a top view showing the electric power train unit 30 mounted on the vehicle body 2. FIG. 12 is a front view showing the electric power train unit 30 mounted on the vehicle body 2. As shown in FIGS. 10 to 12, the vehicle body 2 includes a vehicle body frame 60. The electric power train unit 30 is supported by the vehicle body frame 60. Note that in FIGS. 10 to 12, a part of the vehicle body frame 60 is omitted for ease of understanding.

[0035] As shown in FIGS. 10 to 12, the vehicle body frame 60 includes a first side frame 61, a second side frame 62, and a cross frame 63. The first side frame 61 and the second side frame 62 extend in the vehicle front-rear direction. The first side frame 61 and the second side frame 62 are arranged apart from each other in the vehicle left-right direction. The cross frame 63 extends in the vehicle left-right direction. The cross frame 63 is connected to the first side frame 61 and the second side frame 62.

[0036] The electric power train unit 30 is arranged between the first side frame 61 and the second side frame 62. As shown in FIG. 11, in a top view of the vehicle, at least a part of the first electric motor 23 is arranged on one side of the center line C1 of the vehicle body 2 extending in the front-rear direction of the working machine 1. In a top view of the vehicle, at least a part of the second electric motor 24 is arranged on the other side of the center line C1 of the vehicle body 2 extending in the front-rear direction of the working machine 1. In the present embodiment, in a top view of the vehicle, at least a part of the first electric motor 23 is arranged on the left side of the center line C1 of the vehicle body 2 extending in the front-rear direction of the working machine 1. In a top view of the vehicle, at least a part of the second electric motor 24 is arranged on the right side of the center line C1 of the vehicle body 2 extending in the front-rear direction of the working machine 1.

[0037] In a top view of the vehicle, the central axis A1 of the first electric motor 23 is disposed on one side of the center line C1 of the vehicle body 2 extending in the longitudinal direction of the working machine 1. In a top view of the vehicle, the central axis A2 of the second electric motor 24 is disposed on the other side of the center line C1 of the vehicle body 2 extending in the longitudinal direction of the working machine 1. In the present embodiment, in a top view of the vehicle, the central axis A1 of the first electric motor 23 is disposed on the left side of the center line C1 of the vehicle body 2 extending in the longitudinal direction of the working machine 1. In a top view of the vehicle, the central axis A2 of the second electric motor 24 is disposed on the right side of the center line C1 of the vehicle body 2 extending in the longitudinal direction of the working machine 1. However, the first electric motor 23 and the second electric motor 24 may be arranged in reverse left and right.

[0038] As shown in FIG. 10, above the first side frame 61 and the second side frame 62, the above-described hydraulic oil tank 8 is disposed. The hydraulic oil tank 8 is disposed rearward of the transmission 31. The hydraulic pump 25 is disposed below the hydraulic oil tank 8. The hydraulic pump 25 is connected to the hydraulic oil tank 8 via a hydraulic pipe 64.

[0039] In the working machine 1 according to the present embodiment described above, the first electric motor 23 is attached to the transmission housing 35, and the second electric motor 24 is attached to the transmission housing 35 via the motor bracket 40. Thereby, the first electric motor 23, the second electric motor 24, and the transmission 31 are unitized as an electric power train unit 30. Therefore, the first electric motor 23 and the second electric motor 24 can be arranged compactly. In addition, the structures for attaching the first electric motor 23 and the second electric motor 24 in the vehicle body 2 become unnecessary or are miniaturized. Thereby, in the working machine 1, the vehicle body 2 can be miniaturized.

[0040] In addition, the assemblability of the first electric motor 23, the second electric motor 24, and the transmission 31 to the vehicle body 2 is improved. For example, by attaching the electric power train unit 30 to the vehicle body 2, the first electric motor 23, the second electric motor 24, and the transmission 31 can be integrally attached to the vehicle body 2. Alternatively, by removing the electric power train unit 30 from the vehicle body 2, the first electric motor 23, the second electric motor 24, and the transmission 31 can be integrally removed from the vehicle body 2.

[0041] Also, by removing the motor bracket 40 from the transmission housing 35, the motor bracket 40, the second electric motor 24, and the hydraulic pump 25 can be integrally removed from the vehicle body 2. By attaching the motor bracket 40 to the transmission housing 35, the motor bracket 40, the second electric motor 24, and the hydraulic pump 25 can be integrally attached to the vehicle body 2. Thereby, the maintainability is improved.

[0042] As described above, an embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

[0043] The working machine 1 is not limited to a wheel loader, and may be other machines such as a bulldozer, a motor grader, or an excavator. The configuration of the working machine 1 is not limited to that of the above embodiment, and may be changed. For example, the structure of the vehicle body frame 60 is not limited to that of the above embodiment, and may be changed.

[0044] The arrangement of the hydraulic oil tank 8 is not limited to that of the above embodiment, and may be changed. For example, as shown in FIG. 13, the hydraulic oil tank 8 may be arranged in front of the transmission 31. In that case, the arrangement of the second electric motor 24 and the hydraulic pump 25 in the electric power train unit 30 may be changed according to the arrangement of the hydraulic oil tank 8.

[0045] FIG. 14 is a perspective view showing an electric power train unit 30 according to a modified example. In the electric power train unit 30, the hydraulic pump 25 and the second electric motor 24 may be arranged in a mutually interchangeable manner with respect to the motor bracket 40. For example, with respect to the same motor bracket 40, the second electric motor 24 may be attachable from either the front or the rear. Alternatively, a motor bracket 40 for attaching the second electric motor 24 from the front and a motor bracket 40 for attaching the second electric motor 24 from the rear may be selectively used.

[0046] As shown in FIGS. 13 and 14, in the electric power train unit 30 according to the modified example, the hydraulic pump 25 and the second electric motor 24 are arranged in a manner opposite to the arrangement in the above-described embodiment with respect to the motor bracket 40. That is, the second electric motor 24 is arranged behind the motor bracket 40. The hydraulic pump 25 is arranged in front of the motor bracket 40. Thereby, the hydraulic pump 25 is arranged closer to the hydraulic oil tank 8 than when the hydraulic pump 25 is arranged behind the motor bracket 40. Therefore, the routing of the hydraulic pipe 64 from the hydraulic oil tank 8 to the hydraulic pump 25 becomes easier.

[0047] The structure of the electric power train unit 30 is not limited to that of the above-described embodiment and may be changed. For example, the upper end 411 of the bracket main body 41 may be located below the upper end 351 of the transmission housing 35. The shape of the bracket main body 41 is not limited to a circular shape as in the above-described embodiment and may be other shapes such as a polygon.

[0048] The arrangement of the first electric motor 23 and the second electric motor 24 is not limited to that of the above embodiment and may be changed. For example, in a side view of the vehicle, the first electric motor 23 and the second electric motor 24 may be arranged so as not to overlap each other. In a top view of the vehicle, the first electric motor 23 and the second electric motor 24 may be arranged so as not to overlap each other. Other devices such as a speed reducer may be added between the second electric motor 24 and the hydraulic pump 25.

Industrial Applicability

[0049] According to the present disclosure, in a working machine including a plurality of electric motors, the vehicle body can be downsized.

Explanation of Signs

[0050] 2: Vehicle body, 5: Working machine, 6: Travel device, 23: First electric motor, 24: Second electric motor, 25: Hydraulic pump, 30: Electric power train unit, 31: Transmission, 32: Input shaft, 34: Output shaft, 35: Transmission housing, 40: Motor bracket, 41: Bracket body, 42: First bracket fixing part, 44: Opening, 53: Mounting member, 231: First output shaft, 241: Second output shaft

Claims

1. A vehicle body, a traveling device attached to the vehicle body for traveling the vehicle body, a working machine movably connected to the vehicle body, and an electric power train unit for driving the traveling device and the working machine, wherein the electric power train unit includes a transmission including an input shaft, an output shaft connected to the traveling device, and a housing accommodating the input shaft and the output shaft, a first electric motor for the traveling device including a first output shaft connected to the input shaft and attached to the housing, a bracket attached to the housing, and a second electric motor for the working machine attached to the bracket and supported by the housing via the bracket. Working machine.

2. The electric power train unit further includes a hydraulic pump for discharging hydraulic oil for driving the working machine by being driven by the second electric motor, the second electric motor includes a second output shaft, and the hydraulic pump is connected to the second output shaft and arranged coaxially with the second electric motor. The working machine according to claim 1.

3. The bracket is arranged between the hydraulic pump and the second electric motor. The working machine according to claim 2.

4. The bracket includes a bracket main body including an opening, and a fixing portion connected to the bracket main body and fixed to the housing, wherein the hydraulic pump and the second electric motor are arranged through the opening. The working machine according to claim 3.

5. The hydraulic pump and the second electric motor can be arranged by being interchanged with respect to the bracket. The working machine according to claim 3.

6. The second electric motor includes a second output shaft, and the first output shaft and the second output shaft are arranged in parallel with each other. The working machine according to claim 1.

7. In a top view of the vehicle, at least a part of the first electric motor is arranged on one side of the center line of the vehicle body extending in the longitudinal direction of the working machine, and in a top view of the vehicle, at least a part of the second electric motor is arranged on the other side of the center line of the vehicle body extending in the longitudinal direction of the working machine. The working machine according to claim 1.

8. In a top view of the vehicle, the first electric motor and the second electric motor at least partially overlap each other. The working machine according to claim 1.

9. ​ ​ ​ In a side view of the vehicle, the first electric motor and the second electric motor at least partially overlap each other. The working machine according to claim 1.

10. The bracket is detachably attached to the housing. The working machine according to claim 1.

11. The electric power train unit further includes an elastic mount member attached to the housing. The electric power train unit is supported by the vehicle body via the mount member. The working machine according to claim 1.

12. An electric power train unit for a working machine, A transmission including an input shaft, an output shaft, and a housing that houses the input shaft and the output shaft, A first electric motor including a first output shaft connected to the input shaft and attached to the housing, A bracket attached to the housing, A second electric motor including a second output shaft, attached to the bracket, and supported by the housing via the bracket, A hydraulic pump connected to the second output shaft, An electric power train unit comprising.

13. The hydraulic pump is arranged coaxially with the second electric motor. The electric power train unit according to claim 12.

14. The bracket is arranged between the hydraulic pump and the second electric motor. The electric power train unit according to claim 13.

15. The bracket, A bracket body including an opening, A fixing portion connected to the bracket body and fixed to the housing, Including, The hydraulic pump and the second electric motor are arranged through the opening. The electric power train unit according to claim 14.

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