Assembly

Abstract

The invention provides a layout structure of a grounding body, which contributes to miniaturization of a module. The assembly has: a rotating electric machine; a shaft that rotates integrally with the rotating electric machine; a differential gear connected downstream of the shaft; a differential case that houses the differential gear; and a grounding body in contact with the shaft, the grounding body having a portion overlapping the differential case when viewed in the radial direction.

Description

Technical Field

[0001] The present invention relates to an assembly. Background Art

[0002] Patent Documents 1 to 4 disclose assemblies in which a grounding brush is provided on a shaft constituting a power transmission mechanism.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2012-110149

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2018-170829

[0007] Patent Document 3: Japanese Patent Application Publication No. 2018-167653

[0008] Patent Document 4: Japanese Patent Application Publication No. 2018-11441

[0009] Problems to be solved by the invention

[0010] However, in the assemblies described in Patent Documents 1 to 4, sufficient miniaturization of the assembly cannot be achieved simply by providing the grounding brush on the shaft. Summary of the Invention

[0011] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a layout structure of a ground body that contributes to miniaturization of a component.

[0012] According to a certain embodiment of the present invention, a component is provided, which includes: a rotating motor; a shaft that rotates integrally with the rotating motor; a differential gear that is connected downstream of the shaft; a differential case that accommodates the differential gear; and a grounding body that contacts the shaft, and when viewed radially, the grounding body has a portion that overlaps with the differential case.

[0013] Effects of the Invention

[0014] According to this aspect, it is possible to provide a layout structure of a ground body that contributes to miniaturization of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of the components of this embodiment.

[0016] Figure 2 This diagram shows the appearance of the assembly with the second cover removed.

[0017] Figure 3 This is a diagram of the assembly viewed from the speed reduction mechanism side with the second cover removed.

[0018] Figure 4 This is a schematic diagram of the main parts of the component. DETAILED DESCRIPTION

[0019] Hereinafter, an embodiment of the present invention (hereinafter also referred to as the present embodiment) will be described with reference to the drawings. In this specification, the same elements are denoted by the same reference numerals throughout.

[0020] First, refer to Figures 1 to 3 The overall structure of the assembly 100 of this embodiment will be described.

[0021] Figure 1 It is a schematic structural diagram of the assembly 100 according to this embodiment, and more specifically, a schematic expanded diagram showing the connection relationship between the components of the assembly 100 . Figure 2 FIG. 1 is a diagram showing the appearance of the assembly 100 with the second cover 12 removed. Figure 3 1 is a diagram showing the assembly 100 from the speed reduction mechanism 30 side with the second cover 12 removed. Figure 2 and Figure 3 , the up and down directions correspond to the directions of gravity.

[0022] Regarding the term "assembly," an assembly can also be referred to as, for example, a motor assembly (an assembly comprising at least an electric motor) or a power transmission device (a device comprising at least a power transmission mechanism). An electric motor is a rotating electrical machine having a motor function and / or a generator mechanism (at least one of these). A power transmission mechanism is, for example, a gear mechanism and / or a differential gear mechanism. The term "assembly" comprising an electric motor and a power transmission mechanism encompasses both the motor assembly and the power transmission device.

[0023] like Figure 1 As shown, the assembly 100 includes a housing 10, a rotating electrical machine 20, a speed reduction mechanism 30 as a power transmission mechanism, and a differential gear mechanism 40. The assembly 100 is mounted on a vehicle, which is an electric vehicle. The housing 10 includes a first cover 11, a second cover 12, and a casing 13. The rotating electrical machine 20, the speed reduction mechanism 30, and the differential gear mechanism 40 are housed in the housing 10. The first cover 11 extends from one axial side ( Figure 1 The left side of the cylindrical housing 13 is closed by the second cover 12, and the second cover 12 closes the opening of the housing 13 from the other axial side. The rotating electrical machine 20 is housed in the housing 13, and the differential gear mechanism 40 is housed in the differential gear mechanism housing chamber formed by the second cover 12 and the housing 13.

[0024] like Figures 2 to 3As shown, the component 100 further includes an inverter 70. The inverter 70 is provided on the outer wall of the housing 13, and may also be provided inside the housing 13. The inverter 70 is provided close to the rotating motor 20. The inverter 70 is provided above the rotating motor 20. In addition, above and below refer to configurations that appear to overlap in the direction of gravity when observed in a specified direction including, for example, axial observation and radial observation. For example, when the first element and the second element overlap in the direction of gravity when observed axially, if the position of the first element is higher than the position of the second element, the first element is located above the second element. In this case, when observed radially, the first element and the second element may overlap or may be offset.

[0025] Assembly 100 includes oil OL. Oil OL is supplied, for example, from outside housing 10 to rotating electric machine 20 within casing 13 to lubricate rotating electric machine 20. A portion of the oil OL supplied to rotating electric machine 20 is stored and contained within housing 10. The remaining oil OL is discharged outside housing 10. The oil OL can be circulated within and outside housing 10.

[0026] The housing 13 has a through-hole 13a. The through-hole 13a is formed in a portion of the housing 13 that is located below the first and fourth axes AX1 and AX4 in the direction of gravity, connecting the interior of the second cover 12 with the interior of the housing 13. Therefore, the oil OL in the housing 13 can flow into the second cover 12 through the through-hole 13a and is also used to lubricate the differential gear mechanism 40. Oil reservoirs are respectively formed in the second cover 12 and the housing 13 in the portion below the direction of gravity. The oil level LV of the oil reservoir overlaps with the through-hole 13a in a stable circulation state, for example, when viewed in the axial direction. Thus, in a stable circulation state, the oil level becomes the same as the oil level in the oil reservoir in the second cover 12 and the oil reservoir in the housing 13.

[0027] The stable circulation state is a state in which the oil OL circulates stably. For example, when a pump is used to circulate the oil, the oil level LV is stable while the pump is operating. Oil circulation can also be achieved by agitating the oil OL through rotating components such as gears within the housing 10. In this case, the stable circulation state is a state in which the oil level LV is stable while the rotating components rotate.

[0028] The oil level LV is set to a height such that, under a stable circulation state, the stator 22 is immersed in the oil OL and 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 rotational resistance of the rotating electric machine 20 increases dramatically, while at the same time, it is desirable to cool the stator 22. Therefore, by setting the oil level LV as described above, the oil OL is set so that the oil OL contacts the coil ends of the stator 22.

[0029] return Figure 1The rotating electric machine 20 includes a rotor 21, a stator 22, and a rotating shaft 23 serving as an axis, and constitutes the driving source of the vehicle. The rotor 21 is disposed on the outer periphery of the rotating shaft 23. The stator 22 is disposed in the housing 13 and houses the rotor 21. The rotating shaft 23 is disposed so as to rotate integrally with the rotor 21 and protrudes axially from the rotor 21 on both sides. The rotating shaft 23 penetrates the first cover 11 at one axial end and penetrates both the housing 13 and the second cover 12 at the other axial end. A bearing 51 is provided in the portion of the first cover 11 through which the rotating shaft 23 penetrates, and a bearing 52 is provided in the portion of the housing 13 through which the rotating shaft 23 penetrates. 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.

[0030] like Figure 2 and Figure 3 As shown by the dotted line, the assembly 100 further includes a grounding brush 50. The grounding brush 50 is in contact with the front end of the rotating shaft 23. The details of the grounding brush 50 will be described later.

[0031] The reduction mechanism 30 is a gear mechanism comprising 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 arranged 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 arranged coaxially with respect to the first axis AX1. In other words, the arrangement of multiple elements (components, parts, etc.) on the Nth axis (N is a natural number) is synonymous with the arrangement of multiple elements coaxially with respect to the Nth axis. Similarly, the second gear 32 and the third gear 33 are arranged on the second axis AX2, and the fourth gear 34 and the fifth gear 35 are arranged on the third axis AX3. The sixth gear 36 and the differential gear mechanism 40 are arranged on the fourth axis.

[0032] The first, second, third, and fourth axes AX1, AX2, AX3, and AX4 all constitute the axes of assembly 100 and extend in the same direction. Therefore, the directions in which the first, second, third, and fourth axes AX1, AX2, AX3, and AX4 extend correspond to the axial direction of assembly 100. In other words, the axial direction refers to the axial direction of the rotational axes of the components that constitute the assembly (e.g., the motor, gear mechanism, or differential gear mechanism). The radial direction of assembly 100 is defined as a direction orthogonal to any of the first, second, third, and fourth axes AX1, AX2, AX3, and AX4. The first axis AX1 constitutes the axis of rotating shaft 23, the second axis AX2 constitutes the axis of shaft 37, the third axis AX3 constitutes the axis of shaft 38, and the fourth axis AX4 constitutes the axis of differential gear mechanism 40.

[0033] The first gear 31 is connected to the downstream side of the rotating electrical machine 20. The downstream side refers to the power output side. With respect to the rotating electrical machine 20, this refers to the rotor 21 and stator 22 that generate power. Therefore, the downstream side of the rotating electrical machine 20 can also be considered downstream of the stator 22. Alternatively, regarding the positional relationship in power transmission, the rotating shaft 23 need not be considered a component of the rotating electrical machine 20. While the downstream side is the power output side, the upstream side is the power input side.

[0034] The first gear 31 is connected to the downstream side of the rotating electric machine 20 in a power-transmitting manner. This connection may also be via another structure (e.g., a clutch or other gear mechanism). The first gear 31 is located axially on the other side of the rotor 21 and is attached to the portion of the rotating shaft 23 that protrudes from the housing 13. The first gear 31 is press-fitted into the rotating shaft 23 and becomes integral with it. This allows the first gear 31 to rotate integrally with the rotating shaft 23.

[0035] Second gear 32 meshes with first gear 31. The second gear 32 has a greater number of teeth than first gear 31 and, together with first gear 31, forms the first reduction gear stage. Second gear 32 is mounted on shaft 37, which is arranged on second axis AX2. Second gear 32 and shaft 37 are integrally formed. Shaft 37 extends along rotation axis 23. Shaft 37 is supported by bearings 53 provided in housing 13 and bearings 54 provided in second cover 12. Bearings 53 and 54 are located at opposite ends of shaft 37.

[0036] The third gear 33 is connected downstream of the second gear 32. The third gear 33 is mounted on the shaft 37 and disposed on the second axis AX2. The third gear 33 is mounted on the portion of the shaft 37 that extends farther from the rotating electric machine 20 than the second gear 32, i.e., in the axial direction toward the other side. The third gear 33 is integrally formed with the shaft 37. The second gear 32 and the third gear 33 are axially disposed between the bearings 53 and 54.

[0037] The fourth gear 34 meshes with the third gear 33. The fourth gear 34 has a larger number of teeth than the third gear 33 and, together with the third gear 33, forms the second reduction gear stage. The fourth gear 34 is mounted on a shaft 38, which is disposed on the third axis AX3. The fourth gear 34 and the shaft 38 are integrally formed. The shaft 38 extends along the rotation axis 23. The shaft 38 is supported by a bearing 55 provided in the housing 13 and a bearing 56 provided in the second cover 12. The bearings 55 and 56 are disposed at both ends of the shaft 38.

[0038] The fifth gear 35 is connected downstream of the fourth gear 34. The fifth gear 35 is mounted on a shaft 38, which is disposed on the third shaft AX3. The fifth gear 35 is disposed on a portion of the shaft 38 that extends axially toward the rotating electric machine 20 relative to the fourth gear 34. Therefore, the power transmission direction on the shaft 38 is reversed axially toward the opposite side relative to the shaft 37. The fifth gear 35 is integrally formed with the shaft 38. The fourth gear 34 and the fifth gear 35 are axially disposed between the bearings 55 and 56.

[0039] The sixth gear 36 meshes with the fifth gear 35. The sixth gear 36 is a final reduction gear and is provided in the differential gear mechanism 40. The sixth gear 36 and the differential gear mechanism 40 are disposed on the fourth axis AX4. Power from the rotating electric machine 20 is transmitted from the sixth gear 36 to the differential gear mechanism 40. Therefore, the differential gear mechanism 40 is connected downstream of the sixth gear 36.

[0040] The sixth gear 36 overlaps with the first gear 31 when viewed radially. In other words, the first gear 31 has a portion that overlaps with the sixth gear 36 when viewed radially. This portion overlaps with the sixth gear 36 when viewed radially along a plane containing the first axis AX1 and the fourth axis AX4, for example. Overlapping in a specified direction, including radial and axial observations, refers to overlapping in the specified direction, meaning that multiple elements are arranged in the specified direction. Therefore, if a drawing illustrates multiple elements arranged in a specified direction, it can be considered that the specification contains a description of the overlapping of multiple elements when viewed in the specified direction.

[0041] When the sixth gear 36 is overlapped with the first gear 31 in the radial direction, as described above, the power transmission direction is reversed axially opposite to the shaft 37 by the shaft 38. Therefore, by overlapping the sixth gear 36 with the first gear 31 in the radial direction, the axial dimension can be reduced.

[0042] The sixth gear 36 has a larger number of teeth than the fifth gear 35 and, together with the fifth gear 35, forms the third reduction gear stage. Thus, in the reduction mechanism 30, three reduction stages are achieved, using the first and second gears 31 and 32, the third and fourth gears 33 and 34, and the fifth and sixth gears 35 and 36. This allows for a smaller reduction gear diameter, while maintaining a desired reduction ratio, compared to a single or even two-stage reduction. This alleviates layout constraints, such as the need to maintain interaxial distances corresponding to the large reduction gear diameters, which limits the compactness of the assembly 100.

[0043] Specifically, in assembly 100, three gear stages can be formed using the four axes (first axis AX1 to fourth axis AX4), increasing the number of gear stages compared to single- and double-speed transmissions. Furthermore, by increasing the number of gear stages, the diameter of each gear can be reduced to achieve a desired speed ratio. This alleviates layout constraints caused by overly large gears, thereby improving the layout flexibility of assembly 100.

[0044] In the reduction mechanism 30, the third gear 33 and the fourth gear 34 are positioned farther from the stator 22 than the first gear 31, the second gear 32, the fifth gear 35, and the sixth gear 36. Specifically, the first gear 31, the second gear 32, the fifth gear 35, and the sixth gear 36 are positioned closer to the stator 22, while the remaining two gears, the third gear 33 and the fourth gear 34, are positioned farther from the stator 22. This creates space around these two gears, i.e., at the end of the assembly 100. This allows for a smaller assembly 100 by recessing the end, or for components to be positioned in the space at the end of the assembly 100, thereby increasing layout flexibility.

[0045] The differential gear mechanism 40 includes a differential case 41 and differential gears 42. The differential case 41 is supported by bearings 57 provided on the case 13 and bearings 58 provided on the second cover 12, and rotates together with the sixth gear 36. The sixth gear 36 is coaxially fixed to the outer wall of the differential case 41, which houses the differential gears 42. The differential gears 42 distribute and output power input to the differential case 41 via the sixth gear 36 to the left and right drive wheels of the vehicle.

[0046] The differential gear mechanism 40 protrudes in a direction away from the stator 22 relative to the sixth gear 36. The portion of the differential gear mechanism 40 that protrudes further axially from the sixth gear 36 is designated as a protruding portion. Therefore, in other words, the differential gear mechanism 40 protrudes in a direction away from the sixth gear 36 rather than in a direction toward the stator 22, and is positioned near the sixth gear 36 in a direction away from the stator 22.

[0047] As a result, the differential gear mechanism 40 is arranged in the space at the end of the assembly 100 formed by the gear arrangement of the reduction mechanism 30. This, combined with the aforementioned reduction in axial dimension of the reduction mechanism 30 and the reduction in gear diameter achieved by adopting a three-stage reduction, allows the assembly 100 to be appropriately made more compact. As a result, the layout of the assembly 100 is further improved.

[0048] Bearings 57 and 58 are axially located on both sides of the differential gear mechanism 40. As a result, bearings 53, 55, and 57 are concentrated on one axial side relative to the gears of the reduction mechanism 30 and the differential gear mechanism 40, while bearings 54, 56, and 58 are concentrated on the other axial side. This facilitates ensuring the rigidity of the housing 10, which improves acoustic and vibration performance. Furthermore, since the bearing retaining holes can be concentrated on one axial side and the other axial side, alignment between the three rotating components—shafts 37, 38, and the differential gear mechanism 40—is also facilitated. Furthermore, since the gears of the reduction mechanism 30 and bearings 53 to 58 are concentrated on the other axial side relative to the stator 22, it is easier to position the resolver 80 from one axial side relative to the rotating shaft 23, thereby simplifying assembly of the rotating electrical machine 20.

[0049] A first drive shaft 61 is assembled to the differential gear 42 from one axial side, and a second drive shaft 62 is assembled from the other axial side. Power from the rotating electric machine 20 is transmitted from the differential gear 42 via the first drive shaft 61 to one drive wheel, and via the second drive shaft 62 to the other drive wheel. 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 mechanism 40 and reduces kinking. The first drive shaft 61 is supported by a bearing 59 provided on the first cover 11.

[0050] The sixth gear 36 can also be understood as a part of the differential gear mechanism 40. In other words, the sixth gear 36 can also be understood as a component of the differential gear mechanism 40. In this case, it can also be understood that the differential gear mechanism 40 is connected downstream of the sixth gear 36, with a part of the differential gear mechanism 40 including the differential gear 42 that outputs power from the rotating electric machine 20 being connected downstream of the sixth gear 36.

[0051] like Figure 3 、 Figure 4 As shown, the first axis AX1 and the fourth axis AX4 are positioned below the second axis AX2 and the third axis AX3 when viewed axially. The terms "upper side" and "lower side" refer to a vertical relationship in the direction of gravity when viewed in a specified direction, including axial and radial directions, and include "upper" and "lower side." In contrast to "upper" and "lower side," "upper side" and "lower side" also include obliquely upward and obliquely downward positional relationships when viewed in a specified direction, including axial and radial directions. Therefore, for example, when viewed axially, a first component is positioned obliquely above a second component, without overlapping the second component in the direction of gravity. Furthermore, when viewed radially, the first component is positioned above the second component, without overlapping the second component.

[0052] As a result of the above arrangement, the first axis AX1 and the fourth axis AX4 are concentrated on the lower side of the assembly 100 in the direction of gravity. As a result, the oil OL scattered by the rotation of the sixth gear 36, which is the gear on the downstream side, is easily guided to the rotating electrical machine 20, thereby achieving a layout that allows for proper oil lubrication. Figure 3 As shown by the middle arrow, the oil OL can be guided toward the rotating electrical machine 20 through the through hole 13 a .

[0053] Furthermore, since the rotating electric machine 20, which is arranged on the first axis AX1, is positioned downward in the direction of gravity, space can be provided above the rotating electric machine 20. This prevents an increase in radial dimensions and allows the inverter 70 to be positioned above the rotating electric machine 20, bringing it closer to the rotating electric machine 20. This results in a more compact assembly 100, compared to, for example, a case where the rotating electric machine 20 is positioned upward in the direction of gravity and the inverter 70 is positioned above it, improving layout efficiency.

[0054] Furthermore, when the rotating electrical machine 20 is positioned upward in the direction of gravity and the inverter 70, a high-voltage component, is positioned below it, there is a possibility of leakage due to damage, but this is not a concern. For example, leakage could occur if the inverter 70 is crushed by a heavy object including the rotating electrical machine 20 during a vehicle collision, or if an impact load is applied to the inverter 70 during a vehicle collision.

[0055] As described above, in assembly 100, the gear diameter is reduced by adopting a three-stage reduction gear, which results in less layout constraints. Therefore, the respective placements of the rotating electrical machine 20 and the differential gear mechanism 40 facilitate appropriate setting of the relative oil levels with respect to their respective oil reservoirs.

[0056] In this case, the oil level can be more appropriately set by raising the oil level in the oil reservoir within the second cover 12 relative to the differential gear mechanism 40 (thus, lowering the position of the differential gear mechanism 40). Furthermore, in the rotating electrical machine 20, to prevent the oil OL from entering the air gap between the rotor 21 and the stator 22, the oil level can be more appropriately set by lowering the oil level in the oil reservoir within the housing 13 relative to the differential gear mechanism 40 (thus, raising the position of the rotating electrical machine 20). In this regard, in the assembly 100, the first axis AX1 is positioned above the fourth axis AX4.

[0057] Next, refer to Figures 1 to 4 The main structure of the assembly 100 will be described.

[0058] Figure 4 This is a schematic diagram of the main parts of the assembly 100, which is along the Figure 3The cross-sectional view of line IV-IV. Figure 4 , the direction perpendicular to the paper plane corresponds to the direction of gravity.

[0059] like Figures 1 to 4 As shown, the grounding brush 50 is a grounding element that electrically grounds the rotating shaft 23. The grounding brush 50 is positioned so that its tip contacts the rotating shaft 23 (specifically, the outer peripheral surface of the other end of the rotating shaft 23). The grounding brush 50 is secured to the second cover 12 (specifically, the area of the second cover 12 located outside the through-hole 12a) with bolts 90. In other words, the grounding brush 50 is positioned outside the housing 10. In other words, the grounding brush 50 passes through the through-hole 12a and contacts the other end of the rotating shaft 23, which protrudes outward from the second cover 12.

[0060] like Figure 4 As shown, when viewed radially (specifically, in the vertical direction), the grounding brush 50 overlaps with the differential case 41. In other words, when viewed radially, the grounding brush 50 has a portion that overlaps with the differential case 41. In other words, when viewed radially, the differential case 41 has a portion that overlaps with the grounding brush 50. This improves layout efficiency by providing an area radially outside the differential case 41 for arranging the grounding brush 50, thereby contributing to the miniaturization of the assembly 100. Furthermore, the grounding brush 50 and the differential case 41 may overlap in radial directions other than the vertical direction.

[0061] like Figure 4 As shown, the assembly 100 further includes an oil seal 60 as a sealing member. The oil seal 60 is provided between the outer peripheral surface of the through hole 12a and the outer peripheral surface of the rotating shaft 23 so as to be located between the first gear 31 and the grounding brush 50. This prevents the grounding brush 50 from contacting the oil OL stirred up in the housing 10 (see FIG. 1 ). Figure 3 ) contact. In addition, the oil seal 60 is not limited to Figure 4 The shape may be, for example, an O-ring.

[0062] like Figure 4 As shown, the other end portion of the rotating shaft 23, which serves as the front end portion, located between the grounding brush 50 and the first gear 31, is not supported by a bearing. In other words, the portion of the rotating shaft 23 located axially to the first gear 31 is supported by bearings 51 and 52, but the portion of the rotating shaft 23 located axially to the other side of the first gear 31 is not supported by a bearing. This eliminates the need for a bearing between the first gear 31 and the grounding brush 50, allowing the other end portion of the rotating shaft 23 to be shortened. This, in turn, contributes to the miniaturization of the assembly 100.

[0063] Furthermore, a portion of the rotating shaft 23 located on the other axial side relative to the first gear 31 is supported by the oil seal 60. This makes it possible to suppress vibration caused by the rotation of the rotating shaft 23.

[0064] Next, the main effects of this embodiment will be described.

[0065] (1) The assembly 100 of this embodiment includes: a rotating electrical machine 20; a rotating shaft 23 (shaft) that rotates integrally with the rotating electrical machine 20; a differential case 41 connected downstream of the rotating shaft 23 (shaft); the differential case 41 that houses the differential gear 42; and a grounding brush 50 (grounding member) that contacts the rotating shaft 23 (shaft). When viewed in the radial direction, the grounding brush 50 (grounding member) has a portion that overlaps with the differential case 41.

[0066] According to this configuration, the region for arranging the ground brush 5 is formed radially outside the differential case 41 , thereby improving layout efficiency and contributing to miniaturization of the assembly 100 .

[0067] (2) In addition, in this embodiment, the first gear 31 (gear) is provided to rotate integrally with the rotating shaft 23 (shaft), and the other end portion (front end portion) of the rotating shaft 23 (shaft) located between the grounding brush 50 (grounding body) and the first gear 31 (gear) is not supported by a bearing.

[0068] According to this configuration, since no bearing is provided between the first gear 31 and the grounding brush 50 , the other end portion of the rotating shaft 23 can be shortened. As a result, the assembly 100 can be miniaturized.

[0069] (3) In addition, in the present embodiment, the assembly 100 further includes an oil seal 60 (sealing member) located between the ground brush 50 (grounding body) and the first gear 31 (gear).

[0070] According to this structure, the ground brush 50 can be prevented from coming into contact with the oil OL stirred up in the housing 10 .

[0071] The embodiments of the present invention have been described above, but the above embodiments are merely examples of

[0072] These are only some of the application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above-described embodiments.

[0073] Explanation of symbols

[0074] 20: Rotating motor

[0075] 23: Rotation axis (axis)

[0076] 31: First gear (gear)

[0077] 41: Differential housing

[0078] 42: Differential gear

[0079] 50: Grounding brush (grounding body)

[0080] 60: Oil seal (sealing component)

[0081] 100: Components

Claims

1. A component comprising: Rotating electric machines; a shaft that rotates integrally with the rotating motor; a differential gear connected downstream of the shaft; a differential housing housing the differential gear; a grounding body, which contacts the shaft, When viewed in the radial direction, the ground contact body has a portion overlapping with the differential case.

2. The assembly of claim 1, wherein: having a gear that rotates integrally with the shaft, A front end portion of the shaft located between the grounding body and the gear is not supported by a bearing.

3. The assembly of claim 2, wherein: A sealing member is further provided between the grounding body and the gear.

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