unit

Abstract

[Problem] To improve layout properties of a unit. [Solution] This unit comprises a housing accommodating: an oil; a rotating electric machine; a first gear connected downstream of the rotating electric machine; a second gear which meshes with the first gear; a third gear connected downstream of the second gear; a fourth gear which meshes with the third gear; a fifth gear connected downstream of the fourth gear; and a sixth gear which meshes with the fifth gear. The rotating electric machine and the first gear are disposed on a first axis. The second gear and the third gear are disposed on a second axis. The fourth gear and the fifth gear are disposed on a third axis. The sixth gear is disposed on a fourth axis. The first axis and the fourth axis are disposed below the second axis and the third axis in an axial view.

Description

[Technical field]

[0001] The present invention relates to a unit. [Background technology]

[0002] Patent Document 1 discloses a vehicle drive device including a counter gear mechanism for reducing speed. The vehicle drive device transmits output torque of a rotating electric machine to a pair of wheels via a pair of output members to run the vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 131204 Summary of the Invention [Problem to be solved by the invention]

[0004] A rotating electric machine can be used in combination with a power transmission mechanism such as a reduction gear mechanism or a differential gear. However, if the rotating electric machine and the power transmission mechanism are not unitized and are provided separately, an efficient layout cannot be realized, and as a result, there is a risk that the overall size will be large. For this reason, a unit with high layout efficiency is desired.

[0005] The present invention has been made in view of the above problems, and has an object to improve the layout flexibility of units. [Means for solving the problem]

[0006] A unit according to one embodiment of the present invention has a housing that accommodates oil, a rotating electric machine, a first gear connected downstream of the rotating electric machine, a second gear meshing with the first gear, a third gear connected downstream of the second gear, a fourth gear meshing with the third gear, a fifth gear connected downstream of the fourth gear, and a sixth gear meshing with the fifth gear. The rotating electric machine and the first gear are arranged on a first shaft. The second gear and the third gear are arranged on a second shaft. The fourth gear and the fifth gear are arranged on a third shaft. The sixth gear is arranged on a fourth shaft. When viewed in the axial direction, the first shaft and the fourth shaft are arranged below the second shaft and the third shaft. Effect of the Invention

[0007] According to this embodiment, by increasing the number of gear stages, the diameter of each gear can be made smaller to achieve a predetermined gear ratio. As a result, the layout constraints caused by excessively large gears can be alleviated. This makes it possible to improve the layout flexibility of the unit. Also, by concentrating the first and fourth shafts on the lower side in the direction of gravity, it becomes easier to guide oil scattered by the rotation of the sixth gear, which is the downstream gear, to the rotating electric machine. This results in a layout that allows for appropriate oil lubrication. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram of a unit according to this embodiment. [Diagram 2] FIG. 2 is an external view of the unit. [Diagram 3] FIG. 3 is an external view showing the unit with the second cover removed. [Figure 4] FIG. 4 is a view of the unit viewed from the reduction mechanism side with the second cover removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0010] Fig. 1 is a schematic diagram of a unit 100 according to this embodiment. Fig. 2 is an external view of the unit 100. Fig. 3 is an external view showing the unit 100 with the second cover 12 removed. Fig. 4 is a view of the unit 100 viewed from the reduction mechanism 30 side with the second cover 12 removed. In Fig. 1, the direction perpendicular to the paper surface corresponds to the direction of gravity. In each of Figs. 2 to 4, the up-down direction corresponds to the direction of gravity.

[0011] Regarding the term "unit," the unit can also be called, for example, a motor unit (a unit having at least a motor) or a power transmission device (a device having at least a power transmission mechanism). The motor is a rotating electric machine having an electric motor function and / or a generator function (at least one of an electric motor function and a generator function). The power transmission mechanism is, for example, a gear mechanism and / or a differential gear mechanism. A device (unit) having a motor and a power transmission mechanism is included in the concepts of both a motor unit and a power transmission device.

[0012] As shown in FIG. 1, the unit 100 includes a housing 10, a rotating electric machine 20, a reduction mechanism 30, and a differential gear 40. The unit 100 is mounted on a vehicle, which is an electric vehicle. The housing 10 has a first cover 11, a second cover 12, and a case 13. The rotating electric machine 20, the reduction mechanism 30, and the differential gear 40 are accommodated in the housing 10. The first cover 11 closes an opening of the cylindrical case 13 from one axial side (the left side in FIG. 1), and the second cover 12 closes an opening of the case 13 from the other axial side. The rotating electric machine 20 is accommodated in the case 13, and the differential gear 40 is accommodated in the second cover 12.

[0013] As shown in FIG. 2 to FIG. 4, the unit 100 further includes an inverter 70. The inverter 70 is provided on the outer wall of the case 13. The inverter 70 may be provided inside the case 13. The inverter 70 is provided close to the rotating electric machine 20. The inverter 70 is provided above the rotating electric machine 20. The terms "above" and "below" refer to an arrangement that appears to overlap in the direction of gravity when viewed in a specific direction, including an axial view or a radial view. For example, when the first element overlaps with the second element in the direction of gravity when viewed in the axial direction, if the first element is higher than the second element, the first element is above the second element. In this case, the first element and the second element may overlap or be offset when viewed in the radial direction.

[0014] The unit 100 has oil OL. The oil OL is supplied, for example, from outside the housing 10 to the rotating electric machine 20 in the case 13, and lubricates the rotating electric machine 20. A portion of the oil OL supplied to the rotating electric machine 20 is stored in the housing 10 and contained in the housing 10. The remaining oil OL is discharged to the outside of the housing 10. The oil OL can be used by circulating inside and outside the housing 10.

[0015] The case 13 has a through hole 13a. The through hole 13a is formed in the case 13 in a portion below the first shaft AX1 and the fourth shaft AX4 in the direction of gravity, and communicates between the inside of the second cover 12 and the inside of the case 13. Therefore, the oil OL in the case 13 can flow into the second cover 12 through the through hole 13a, and is also used to lubricate the differential gear 40. An oil reservoir is formed in each of the second cover 12 and the case 13 in the portion below the direction of gravity. The oil level LV of the oil reservoir overlaps with the through hole 13a, for example, when viewed in the axial direction, in a steady circulation state, and thus the oil reservoir in the second cover 12 and the oil reservoir in the case 13 are at a common oil level in a steady circulation state.

[0016] The steady circulation state is a state in which the circulation of the oil OL is steady, and when the oil circulation is performed using a pump, for example, the oil level LV is a state in which the oil level LV is stable while the pump is operating. The oil circulation may be performed by scooping up the oil OL with a rotating member such as a gear inside the housing 10. In this case, the steady circulation state is a state in which the oil level LV is stable while the rotating member is rotating.

[0017] The oil level LV is set to a height at which the stator 22 is immersed in the oil OL in a steady circulation state, but the oil OL does not enter the gap (air gap) between the rotor 21 and the stator 22. This is because, if the oil OL enters the air gap, the rotation resistance of the rotating electric machine 20 increases rapidly, while it is desirable to cool the stator 22. For this reason, the oil level LV is set as described above, so that the oil OL comes into contact with the coil ends of the stator 22.

[0018] Returning to FIG. 1 , the rotating electric machine 20 includes a rotor 21, a stator 22, and a rotating shaft 23, and constitutes a drive source for the vehicle. The rotor 21 is provided on the outer periphery of the rotating shaft 23. The stator 22 is provided in the case 13 and houses the rotor 21. The rotating shaft 23 protrudes from the rotor 21 toward both sides in the axial direction. The rotating shaft 23 penetrates the first cover 11 at one axial end side and penetrates the case 13 at the other axial end side. A bearing 51 is provided on the first cover 11 at the portion through which the rotating shaft 23 penetrates, and a bearing 52 is provided on the case 13 at the portion through which the rotating shaft 23 penetrates, and the rotating shaft 23 is supported by the bearings 51 and 52. A resolver 80 is provided on the portion of the rotating shaft 23 protruding from the first cover 11. The resolver 80 detects the rotation of the rotating electric machine 20.

[0019] The reduction mechanism 30 is a gear mechanism, and includes a first gear 31, a second gear 32, a third gear 33, a fourth gear 34, a fifth gear 35, a sixth gear 36, a shaft 37, and a shaft 38. The first gear 31 is disposed on the first axis AX1 together with the rotating electric machine 20. In other words, the rotating electric machine 20 and the first gear 31 are disposed coaxially with respect to the first axis AX1. In other words, the disposition of a plurality of elements (parts, portions, etc.) on the Nth axis (N is a natural number) is synonymous with the disposition of a plurality of elements coaxially with respect to the Nth axis. Similarly, the second gear 32 and the third gear 33 are disposed on the second axis AX2, and the fourth gear 34 and the fifth gear 35 are disposed on the third axis AX3. The sixth gear 36 and the differential gear 40 are disposed on the fourth axis.

[0020] The first axis AX1, the second axis AX2, the third axis AX3, and the fourth axis AX4 all constitute the axes of the unit 100 and extend in the same direction. Therefore, the extension directions of the first axis AX1, the second axis AX2, the third axis AX3, and the fourth axis AX4 all correspond to the axial direction of the unit 100. In other words, the axial direction means the axial direction of the rotating shaft of the component (e.g., the motor, the gear mechanism, or the differential gear mechanism) that constitutes the unit. The radial direction of the unit 100 is a direction perpendicular to any one of the first axis AX1, the second axis AX2, the third axis AX3, and the fourth axis AX4. The first axis AX1 constitutes the axis of the rotating shaft 23, the second axis AX2 constitutes the axis of the shaft 37, the third axis AX3 constitutes the axis of the shaft 38, and the fourth axis AX4 constitutes the axis of the differential gear 40.

[0021] The first gear 31 is connected downstream of the rotating electric machine 20. The downstream is the power output side, and with respect to the rotating electric machine 20, the rotor 21 and the stator 22 that generate power are used as references. Therefore, the downstream of the rotating electric machine 20 can be said to be the downstream of the stator 22. Alternatively, with regard to the positional relationship in power transmission, the rotating shaft 23 does not have to be understood as a component of the rotating electric machine 20. The downstream is the power output side, while the upstream is the power input side.

[0022] The first gear 31 is connected downstream of the rotating electric machine 20 so as to be capable of transmitting power. The connection may be via another configuration (for example, a clutch or another gear mechanism). The first gear 31 is provided on the other axial side of the rotor 21, and is provided on the rotating shaft 23 at a portion protruding from the case 13. The first gear 31 is press-fitted into the rotating shaft 23 and is integrated therewith.

[0023] The second gear 32 meshes with the first gear 31. The second gear 32 is set to have a larger number of teeth than the first gear 31, and together with the first gear 31, constitutes a first reduction gear stage. The second gear 32 is provided on a shaft 37 and disposed on a second axis AX2. The second gear 32 is formed integrally with the shaft 37. The shaft 37 extends along the rotation axis 23. The shaft 37 is supported by a bearing 53 provided in the case 13 and a bearing 54 provided in the second cover 12. The bearings 53 and 54 are disposed at both ends of the shaft 37.

[0024] The third gear 33 is connected downstream of the second gear 32. The third gear 33 is provided on the shaft 37, and arranged on the second axis AX2. The third gear 33 is provided on the shaft 37 at a portion extending in a direction away from the rotating electric machine 20, that is, toward the other axial side, relative to the second gear 32. The third gear 33 is formed integrally with the shaft 37. The second gear 32 and the third gear 33 are arranged between the bearing 53 and the bearing 54 in the axial direction.

[0025] The fourth gear 34 meshes with the third gear 33. The fourth gear 34 is set to have a larger number of teeth than the third gear 33, and together with the third gear 33, forms a second reduction gear stage. The fourth gear 34 is provided on a shaft 38 and disposed on the third axis AX3. The fourth gear 34 is formed integrally with the shaft 38. The shaft 38 extends along the rotation axis 23. The shaft 38 is supported by a bearing 55 provided in the case 13 and a bearing 56 provided in the second cover 12. The bearings 55 and 56 are disposed on both ends of the shaft 38.

[0026] The fifth gear 35 is connected downstream of the fourth gear 34. The fifth gear 35 is provided on the shaft 38, and arranged on the third axis AX3. The fifth gear 35 is provided on the shaft 38 in a direction closer to the rotating electric machine 20 than the fourth gear 34, that is, on a portion of the shaft 38 extending to one axial side. Therefore, the power transmission direction of the shaft 38 is turned back to the opposite axial direction compared to the shaft 37. The fifth gear 35 is formed integrally with the shaft 38. The fourth gear 34 and the fifth gear 35 are arranged between the bearing 55 and the bearing 56 in the axial direction.

[0027] The sixth gear 36 meshes with the fifth gear 35. The sixth gear 36 is a final gear, and is provided on the differential gear 40. The sixth gear 36 is disposed on the fourth shaft AX4 together with the differential gear 40. Power from the rotating electric machine 20 is transmitted from the sixth gear 36 to the differential gear 40. Therefore, the differential gear 40 is connected downstream of the sixth gear 36.

[0028] The sixth gear 36 overlaps with the first gear 31 in a radial view. In other words, the first gear 31 has a portion that overlaps with the sixth gear 36 in a radial view. For example, the portion overlaps with the sixth gear 36 in a radial view along a plane including the first axis AX1 and the fourth axis AX4. "Overlapping" when viewed in a predetermined direction, including a radial view or an axial view, means overlapping in a predetermined direction, and means that multiple elements are lined up in the predetermined direction. For this reason, when a drawing shows multiple elements lined up in a predetermined direction, it may be considered that the specification contains a sentence explaining that multiple elements overlap when viewed in a predetermined direction.

[0029] When the sixth gear 36 overlaps with the first gear 31 as viewed in the radial direction, the power transmission direction is turned back in the axially opposite direction by the shaft 38 relative to the shaft 37, as described above. Therefore, by overlapping the sixth gear 36 with the first gear 31 as viewed in the radial direction, the axial dimension is reduced.

[0030] The sixth gear 36 is set to have a larger number of teeth than the fifth gear 35, and constitutes a third reduction gear stage together with the fifth gear 35. Therefore, in the reduction mechanism 30, three stages of reduction are performed by the first gear 31 and the second gear 32, the third gear 33 and the fourth gear 34, and the fifth gear 35 and the sixth gear 36. This makes it possible to make the reduction gear diameter smaller in order to ensure a reduction ratio, compared to the case of one or two stages of reduction. As a result, layout restrictions such as limitations on compactness of the unit 100 due to the necessity of ensuring an inter-axis distance corresponding to a large reduction gear diameter are alleviated.

[0031] In other words, in the unit 100, three gear stages can be formed by the four shafts, 1st shaft AX1 to 4th shaft AX4, and the number of gear stages can be increased compared to the case of one-stage or two-stage shifting. By increasing the number of gear stages, the diameter of each gear can be made smaller to achieve a specified gear ratio. As a result, the layout constraints caused by excessively large gears can be alleviated. This makes it possible to improve the layout flexibility of the unit 100.

[0032] In the reduction mechanism 30, the third gear 33 and the fourth gear 34 are disposed in a direction away from the stator 22 with respect to the first gear 31, the second gear 32, the fifth gear 35, and the sixth gear 36. That is, the four gears, the first gear 31, the second gear 32, the fifth gear 35, and the sixth gear 36, are moved toward the stator 22, and the remaining two gears, the third gear 33 and the fourth gear 34, are moved toward the side away from the stator 22. As a result, a space is formed around the two gears, that is, on the end side of the unit 100. For this reason, it is possible to make the end of the unit 100 recessed to achieve miniaturization, or to place a member in the space on the end side of the unit 100, thereby increasing the degree of freedom in layout.

[0033] The differential gear 40 is a differential gear mechanism and includes a differential case 41 and a differential portion 42. The differential case 41 is supported by a bearing 57 provided in the case 13 and a bearing 58 provided in the second cover 12, and rotates together with the sixth gear 36. The sixth gear 36 is coaxially fixed to an outer wall portion of the differential case 41, and the differential case 41 houses the differential portion 42. The differential portion 42 distributes and outputs the power input to the differential case 41 via the sixth gear 36 to each of the drive wheels in the left and right directions of the vehicle.

[0034] The differential gear 40 protrudes in a direction away from the stator 22 relative to the sixth gear 36. The differential gear 40 protrudes in this manner with a portion that protrudes more in the axial direction from the sixth gear 36 as a protruding portion. In other words, the differential gear 40 protrudes more in a direction away from the stator 22 relative to the sixth gear 36 than in a direction toward the stator 22, and is disposed closer to the stator 22 than the sixth gear 36.

[0035] As a result, the differential gear 40 is disposed in a space on the end side of the unit 100 that is formed according to the gear arrangement of the reduction mechanism 30. This, combined with the reduction in the axial dimension of the reduction mechanism 30 as described above and the reduction in gear diameter achieved by adopting the three-stage reduction, favorably achieves a compact design of the unit 100. As a result, the layout flexibility of the unit 100 is further improved.

[0036] The bearings 57 and 58 are disposed on both sides of the differential gear 40 in the axial direction. As a result, the bearings 53, 55, and 57 are disposed on one axial side of the gears of the reduction mechanism 30 and the differential gear 40, and the bearings 54, 56, and 58 are disposed on the other axial side. This makes it easier to ensure the rigidity of the housing 10, which is advantageous in terms of sound and vibration performance. In addition, since the bearing retaining holes can be machined together on one axial side and the other axial side, it is easier to align the centers between the three rotating members, the shaft 37, the shaft 38, and the differential gear 40. Furthermore, since the gears of the reduction mechanism 30 and the bearings 53 to 58 are disposed together on the other axial side of the stator 22, it becomes easier to dispose the resolver 80 from one axial side of the rotating shaft 23, and the rotating electric machine 20 becomes easier to assemble.

[0037] A first drive shaft 61 is attached to the differential part 42 from one axial side, and a second drive shaft 62 is attached to the differential part 42 from the other axial side. Power from the rotating electric machine 20 is transmitted from the differential part 42 to one drive wheel via the first drive shaft 61, and to the other drive wheel via the second drive shaft 62. The first drive shaft 61 is longer than the second drive shaft 62, which increases the distance between the drive wheels and the differential gear 40, thereby suppressing the bend angle. The first drive shaft 61 is supported by a bearing 59 provided in the first cover 11.

[0038] The sixth gear 36 can also be understood as part of the differential gear 40. In other words, the sixth gear 36 can also be understood as one component of the differential gear 40. Even in this case, it can be understood that the differential gear 40 is connected downstream of the sixth gear 36 with a part of the differential gear 40 including a differential unit 42 that outputs power from the rotating electric machine 20 being connected downstream of the sixth gear 36.

[0039] As shown in Fig. 3 and Fig. 4, the first axis AX1 and the fourth axis AX4 are disposed below the second axis AX2 and the third axis AX3 in the axial view. The upper side and the lower side refer to the up-down relationship in the direction of gravity in a predetermined direction, including the axial view and the radial view, and include the upper side and the lower side. In contrast to the upper side and the lower side, the upper side and the lower side further include the positional relationship of being obliquely above and obliquely below in a predetermined direction, including the axial view and the radial view. Therefore, for example, when the first element is located obliquely above the second element without overlapping with the second element in the direction of gravity in the axial view, and the first element and the second element do not overlap with each other in the radial view, the first element is located above the second element.

[0040] As a result of being arranged as described above, the first shaft AX1 and the fourth shaft AX4 are arranged on the lower side of the unit 100 in the direction of gravity. This makes it easier to guide the oil OL scattered by the rotation of the sixth gear 36, which is the downstream gear, to the rotating electric machine 20, resulting in a layout that enables appropriate oil lubrication. The oil OL can be guided to the rotating electric machine 20 through the through hole 13a as shown by the arrow in FIG. 4.

[0041] Furthermore, since the rotating electric machine 20 arranged on the first axis AX1 is arranged on the lower side in the direction of gravity, it is possible to provide a space above the rotating electric machine 20. This makes it possible to arrange the inverter 70 above the rotating electric machine 20 and bring it close to the rotating electric machine 20 while suppressing an increase in the radial dimension. As a result, the unit 100 becomes more compact than, for example, a case in which the rotating electric machine 20 is arranged on the upper side in the direction of gravity and the inverter 70 is further arranged above it, and the layout flexibility of the unit 100 is also improved.

[0042] Furthermore, when the rotating electric machine 20 is arranged above in the direction of gravity and the inverter 70, which is a high-voltage component, is arranged below it, there is a concern that leakage current may occur due to damage as described below, but such a concern is not present. Leakage current due to damage may occur, for example, when the inverter 70 is crushed by a heavy object including the rotating electric machine 20 during a vehicle collision, or when an impact load is applied to the inverter 70 when the vehicle hits the bottom.

[0043] As described above, the gear diameter is reduced by adopting the three-stage reduction in the unit 100, which results in easing layout restrictions. Therefore, by arranging the rotating electric machine 20 and the differential gear 40, it becomes easier to appropriately set the relative oil level of the oil reservoir for each of them.

[0044] In this case, the oil level can be set more appropriately for the differential gear 40 by relatively raising the oil level of the oil reservoir in the second cover 12 (thus lowering the position of the differential gear 40). Also, the oil level can be set more appropriately for the rotating electric machine 20 by relatively lowering the oil level of the oil reservoir in the case 13 (thus raising the position of the rotating electric machine 20) in order to suppress infiltration of oil OL into the air gap between the rotor 21 and the stator 22. From this perspective, in the unit 100, the first shaft AX1 is disposed above the fourth shaft AX4.

[0045] Next, the main effects of this embodiment will be described.

[0046] (1) The unit 100 has a housing 10 that accommodates the oil OL, the rotating electric machine 20, a first gear 31 connected downstream of the rotating electric machine 20, a second gear 32 meshing with the first gear 31, a third gear 33 connected downstream of the second gear 32, a fourth gear 34 meshing with the third gear 33, a fifth gear 35 connected downstream of the fourth gear 34, and a sixth gear 36 meshing with the fifth gear 35. The rotating electric machine 20 and the first gear 31 are disposed on a first shaft AX1. The second gear 32 and the third gear 33 are disposed on a second shaft AX2. The fourth gear 34 and the fifth gear 35 are disposed on a third shaft AX3. The sixth gear 36 is disposed on a fourth shaft AX4. When viewed in the axial direction, the first shaft AX1 and the fourth shaft AX4 are disposed below the second shaft AX2 and the third shaft AX3.

[0047] According to this configuration, the diameter of each gear can be made smaller to realize a predetermined gear ratio by increasing the number of gear stages. As a result, the layout constraints caused by excessively large gears can be alleviated. This improves the layout flexibility of the unit 100. In addition, by arranging the first shaft AX1 and the fourth shaft AX4 to be concentrated on the lower side in the direction of gravity, the oil OL scattered by the rotation of the sixth gear 36, which is the downstream gear, can be easily guided to the rotating electric machine 20 side as described above. This results in a layout that allows for appropriate oil lubrication.

[0048] In this case, the layout of the unit 100 can be improved by making it more compact as described above. In addition, there is no risk of leakage current due to damage to the inverter 70 as described above, and the relative oil levels of the oil reservoirs for the rotating electrical machine 20 and the differential gear 40 can be easily set appropriately.

[0049] (2) In the unit 100, when viewed in the radial direction, the first gear 31 has a portion that overlaps with the sixth gear 36. With this configuration, the axial dimension can be shortened compared to a case in which the differential gear 40 is arranged axially inverted with respect to the third gear 33 and the fourth gear 34, which contributes to shortening the axial dimension.

[0050] (3) In the unit 100, the third gear 33 and the fourth gear 34 are disposed in a direction away from the stator 22 relative to the first gear 31, the second gear 32, the fifth gear 35, and the sixth gear 36. This creates space around the two gears, the third gear 33 and the fourth gear 34, i.e., on the end side of the unit 100. This makes it possible to make the end side of the unit 100 recessed to reduce its size, or to place another member in the space on the end side of the unit 100, thereby increasing the freedom of layout.

[0051] (4) The unit 100 has a differential gear 40 connected downstream of the sixth gear 36. The differential gear 40 is disposed on the fourth shaft AX4. The differential gear 40 protrudes in a direction away from the stator 22 relative to the sixth gear 36. With this configuration, the differential gear 40 is disposed in the space on the end side of the unit 100, so that the unit 100 can be suitably made compact, and the freedom of layout can be further increased.

[0052] Although the embodiments of the present invention have been described above, the above-mentioned embodiments merely show some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above-mentioned embodiments. [Explanation of symbols]

[0053] 10. Housing 20 Rotating Electric Machine 21 Rotor 22 Stator 23 Rotation axis 30 Reduction mechanism 31 First Gear 32 2nd Gear 33 3rd Gear 34 4th Gear 35 5th Gear 36 6th Gear 40 Differential Gear 70 Inverter 100 units AX1 1st axis AX2 2nd axis AX3 3rd axis AX4 4th axis

Claims

1. Oil and A rotating electric machine; A first gear connected downstream of the rotating electric machine; A second gear that meshes with the first gear; a third gear connected downstream of the second gear; a fourth gear meshing with the third gear; A fifth gear connected downstream of the fourth gear; A sixth gear that meshes with the fifth gear; a housing for receiving the the rotating electric machine and the first gear are disposed on a first shaft, the second gear and the third gear are disposed on a second shaft, the fourth gear and the fifth gear are disposed on a third shaft, the sixth gear is disposed on a fourth shaft, When viewed in the axial direction, the first axis and the fourth axis are disposed below the second axis and the third axis, the oil scattered by the rotation of the sixth gear is guided to the rotating electric machine side through a through hole provided in a portion of the housing arranged on the first gear side as viewed from the rotating electric machine, The through hole is provided below the fourth axis in the direction of gravity. unit.

2. 2. The unit of claim 1, When viewed in a radial direction, the first gear has a portion overlapping with the sixth gear. unit.

3. 3. A unit according to claim 1 or 2, the third gear and the fourth gear are disposed in a direction away from the stator of the rotating electric machine relative to the first gear, the second gear, the fifth gear, and the sixth gear. unit.

4. 4. The unit according to claim 3, a differential gear connected downstream of the sixth gear; the differential gear is disposed on the fourth shaft, the differential gear protrudes in a direction away from the stator relative to the sixth gear; unit.

5. 2. The unit of claim 1, When viewed in the axial direction, the first axis is located above the fourth axis. unit.

6. 2. The unit of claim 1, an oil reservoir formed by the oil has a portion overlapping with the through hole when viewed in the axial direction and a portion not overlapping with the through hole when viewed in the axial direction; unit.

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