Power transmission device

Abstract

An amount of lubricating oil introduced to a prescribed portion is increased. A power transmission apparatus has a pinion gear having a large planetary gear and a small planetary gear, a planetary gear carrier that supports the pinion gear, a ring gear that meshes with the small planetary gear, an oil supply portion that is located at a position higher than a horizontal line that passes through a revolution center of the pinion gear, and a downstream side wall portion that opposes a gear face of the large planetary gear and is configured to be adjacent to the oil supply portion in a downstream direction of revolution of the pinion gear than the oil supply portion when viewed in an axial direction.

Description

Technical Field

[0001] This invention relates to a power transmission device. Background Technology

[0002] Patent document 1 discloses a power transmission device for electric vehicles having a bevel gear differential mechanism and a planetary gear mechanism.

[0003] The planetary gear mechanism features a stepped pinion with large planetary gears and small planetary gears.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 8-240254 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In power transmission devices, it is required to increase the amount of lubricating oil that is scraped up and guided to designated locations.

[0009] Technical solutions for solving the problem

[0010] One aspect of the present invention provides a power transmission device comprising:

[0011] The small gear has both large planetary gears and small planetary gears;

[0012] A planetary gear carrier that supports the pinion;

[0013] A gear ring that meshes with the asteroid gear;

[0014] The oil supply section is located above the horizontal line passing through the center of revolution of the pinion;

[0015] The downstream sidewall portion faces the gear face of the large planetary gear.

[0016] The downstream sidewall portion is configured to be adjacent to the oil supply portion downstream of the pinion in the direction of revolution when viewed from the axial direction.

[0017] Invention Effects

[0018] According to a certain method of the present invention, it is possible to increase the amount of lubricating oil. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a power transmission device.

[0020] Figure 2 This is a schematic diagram of the cross-section of the power transmission device.

[0021] Figure 3 This is an enlarged view of the planetary reduction gears in the power transmission device.

[0022] Figure 4 This is an enlarged view of the differential mechanism surrounding the power transmission device.

[0023] Figure 5 This is a three-dimensional diagram of the differential mechanism of the power transmission device.

[0024] Figure 6 This is an exploded three-dimensional view of the differential mechanism of the power transmission device.

[0025] Figure 7 This is a diagram illustrating the first housing portion of the differential mechanism.

[0026] Figure 8 This is a diagram illustrating the first housing portion of the differential mechanism.

[0027] Figure 9 This is a diagram illustrating the first housing portion of the differential mechanism.

[0028] Figure 10 This is a diagram illustrating the first housing portion of the differential mechanism.

[0029] Figure 11 This is a diagram illustrating the second housing portion of the differential mechanism.

[0030] Figure 12 This is a diagram illustrating the second housing portion of the differential mechanism.

[0031] Figure 13 This is a diagram illustrating the second housing portion of the differential mechanism.

[0032] Figure 14 This is a diagram illustrating the second housing portion of the differential mechanism.

[0033] Figure 15 This is a diagram illustrating the second housing portion of the differential mechanism.

[0034] Figure 16 This is a diagram illustrating the second housing portion of the differential mechanism.

[0035] Figure 17 This is a diagram illustrating the oil collection section.

[0036] Figure 18 This is a diagram illustrating the oil collection section.

[0037] Figure 19 This is a diagram illustrating the oil collection section.

[0038] Figure 20 This is a diagram illustrating the oil collection section.

[0039] Figure 21 This is a diagram illustrating the oil collection section.

[0040] Figure 22 This is a diagram illustrating the oil collection section.

[0041] Figure 23 This is a diagram of the instruction panel components.

[0042] Figure 24 This is a diagram of the instruction panel components.

[0043] Figure 25 This is a view of the fourth housing from the motor side.

[0044] Figure 26 This is a diagram illustrating the configuration of the panel components.

[0045] Figure 27 It is a diagram illustrating the movement of the scraped oil. Detailed Implementation

[0046] The embodiments of the present invention will be described below.

[0047] Figure 1 This is a schematic diagram illustrating the power transmission device 1 of this embodiment.

[0048] Figure 2 This is a schematic diagram illustrating the cross-section of the power transmission device 1 of this embodiment.

[0049] Figure 3 This is an enlarged view of the planetary reduction gear 4 around the power transmission device 1.

[0050] Figure 4 This is an enlarged view of the differential mechanism 5 surrounding the power transmission device 1.

[0051] like Figure 1 As shown, the power transmission device 1 includes a motor 2 and a planetary reduction gear 4 (reduction mechanism) that reduces the output rotation of the motor 2 and inputs it to the differential mechanism 5. The power transmission device 1 also includes a drive shaft 9 (9A, 9B) as a drive shaft and a parking lock mechanism 3.

[0052] In the power transmission device 1, a parking lock mechanism 3, a planetary reduction gear 4, a differential mechanism 5, and drive shafts 9 (9A, 9B) are provided along the transmission path of the output rotation of the motor 2.

[0053] In the power transmission device 1, the output rotation of the motor 2 is reduced by the planetary reduction gear 4 and input to the differential mechanism 5, and then transmitted to the left and right drive wheels W and W' of the vehicle equipped with the power transmission device 1 via the drive shafts 9 (9A, 9B).

[0054] Here, planetary reduction gear 4 is connected downstream of motor 2. Differential mechanism 5 is connected downstream of planetary reduction gear 4. Drive shafts 9 (9A, 9B) are connected downstream of differential mechanism 5.

[0055] like Figure 2 As shown, the main housing 10 of the power transmission device 1 has a first housing 11 that houses the motor 2 and a second housing 12 that is inserted into the first housing 11. The main housing 10 also has a third housing 13 assembled to the first housing 11 and a fourth housing 14 assembled to the second housing 12.

[0056] The first housing 11 has a cylindrical support wall portion 111 and a flange-shaped joint portion 112 provided at one end 111a of the support wall portion 111.

[0057] The first housing 11 is arranged such that the support wall 111 is aligned with the rotation axis X of the motor 2. The motor 2 is housed inside the support wall 111.

[0058] The joint portion 112 is arranged in an orientation orthogonal to the rotation axis X. The joint portion 112 is formed with an outer diameter larger than that of the support wall portion 111.

[0059] The second housing 12 has: a cylindrical peripheral wall portion 121, a flange-shaped joint portion 122 provided at one end 121a of the peripheral wall portion 121, and a flange-shaped joint portion 123 provided at the other end 121b of the peripheral wall portion 121.

[0060] The peripheral wall portion 121 is formed with the inner diameter of the support wall portion 111 that can be inserted into the first housing 11.

[0061] The first housing 11 and the second housing 12 are assembled together by inserting the peripheral wall portion 121 of the second housing 12 into the supporting wall portion 111 of the first housing 11.

[0062] The joint 122 on one end 121a of the peripheral wall 121 abuts against the joint 112 of the first housing 11 in the direction of the rotation axis X. These joints 122, 112 are connected to each other by bolts (not shown).

[0063] In the first housing 11, a plurality of grooves 111b are provided on the outer periphery of the support wall portion 111. The plurality of grooves 111b are spaced apart in the direction of rotation axis X. Each groove 111b is provided covering the entire circumference of the rotation axis X.

[0064] The peripheral wall portion 121 of the second housing 12 is inserted into the support wall portion 111 of the first housing 11. The opening of the groove 111b is closed by the peripheral wall portion 121. Multiple cooling paths CP for cooling water flow are formed between the support wall portion 111 and the peripheral wall portion 121.

[0065] On the outer periphery of the support wall portion 111 of the first housing 11, annular grooves 111c and 111c are formed on both sides of the area where the groove 111b is provided. Sealing rings 113 and 113 are externally installed in the annular grooves 111c and 111c.

[0066] These sealing rings 113 are pressed against the inner circumference of the peripheral wall portion 121 inserted into the support wall portion 111, sealing the gap between the outer circumference of the support wall portion 111 and the inner circumference of the peripheral wall portion 121.

[0067] A wall portion 120 extending toward the inner diameter side is provided at the other end 121b of the second housing 12. The wall portion 120 is arranged in an orientation orthogonal to the rotation axis X. An opening 120a through which the drive shaft 9A is inserted is provided in the area of ​​the wall portion 120 that intersects the rotation axis X.

[0068] In the wall portion 120, a cylindrical motor support portion 125 surrounding the opening 120a is provided on the surface of the motor 2 side (right side in the figure).

[0069] The motor support 125 is inserted into the inside of the coil end 253b, which will be described later. The motor support 125 is positioned opposite the end 21b of the rotor core 21 with a gap in the X direction of the rotation axis.

[0070] Regarding the peripheral wall portion 121 of the second housing 12, in the vertical direction that sets the power transmission device 1 to the vehicle mounting state as a reference, the radial thickness of the lower region is thicker than that of the upper region.

[0071] In this radially thick region, an oil storage section 128 is provided through the rotation axis X direction.

[0072] The oil storage section 128 is connected to the axial oil passage 138 of the joint 132 provided in the third housing 13 via the connecting hole 112a. The connecting hole 112a is provided in the joint 112 of the first housing 11.

[0073] The third housing 13 has a wall portion 130 orthogonal to the rotation axis X. A joint portion 132 forming an annular shape when viewed from the rotation axis X direction is provided on the outer periphery of the wall portion 130.

[0074] Viewed from the first housing 11, the third housing 13 is located on the opposite side (right side in the figure) from the differential mechanism 5. The joint 132 of the third housing 13 engages with the joint 112 of the first housing 11 in the direction of the rotation axis X. The third housing 13 and the first housing 11 are connected to each other by bolts (not shown). In this state, the opening on the joint 122 side (right side in the figure) of the support wall portion 111 of the first housing 11 is blocked by the third housing 13.

[0075] In the third housing 13, a through hole 130a for the drive shaft 9A is provided in the center of the wall 130.

[0076] A lip seal RS is provided on the inner circumference of the through hole 130a. The lip seal RS allows the lip (not shown) to elastically contact the outer circumference of the drive shaft 9A. The gap between the inner circumference of the through hole 130a and the outer circumference of the drive shaft 9A is sealed by the lip seal RS.

[0077] A peripheral wall portion 131 surrounding the insertion hole 130a is provided on the surface of the first housing 11 side (left side in the figure). The drive shaft 9A is supported on the inner periphery of the peripheral wall portion 131 via a bearing B4.

[0078] Viewed from the peripheral wall portion 131, a motor support portion 135 is provided on the motor side 2 (left side in the figure). The motor support portion 135 is a cylindrical shape that surrounds the outer periphery of the rotating shaft X at intervals.

[0079] A cylindrical connecting wall 136 is connected to the outer periphery of the motor support portion 135. The connecting wall 136 is formed with an outer diameter larger than that of the peripheral wall portion 131 on the side of the wall portion 130 (right side in the figure). The connecting wall 136 is arranged along the rotation axis X and extends in a direction away from the motor 2. The connecting wall 136 connects the motor support portion 135 and the wall portion 130 of the third housing 13.

[0080] The motor support 135 is supported by the third housing 13 via the connecting wall 136. One end 20a of the motor shaft 20 extends from the motor 2 side to the inner side of the motor support 135 through the peripheral wall 131 side.

[0081] A bearing B1 is supported on the inner circumference of the motor support portion 135. The outer circumference of the motor shaft 20 is supported by the motor support portion 135 via the bearing B1.

[0082] A lip seal RS is provided at a position adjacent to bearing B1.

[0083] In the third housing 13, an oil hole 136a, described later, is provided on the inner periphery of the connecting wall 136. Oil OL flows from the oil hole 136a into the space (internal space Sc) surrounded by the connecting wall 136. A lip seal RS is provided to prevent the oil OL in the connecting wall 136 from flowing into the motor 2 side.

[0084] The fourth housing 14 has a peripheral wall portion 141 surrounding the outer periphery of the planetary reduction gear 4 and the differential mechanism 5, and a flange-shaped joint portion 142 provided at the end of the second housing 12 side of the peripheral wall portion 141.

[0085] Viewed from the second housing 12, the fourth housing 14 is located on the side of the differential mechanism 5 (left side in the figure). The joint 142 of the fourth housing 14 engages with the joint 123 of the second housing 12 in the direction of the rotation axis X. The fourth housing 14 and the second housing 12 are connected to each other by bolts (not shown).

[0086] Inside the main housing 10 of the power transmission device 1, there is a motor chamber Sa that houses the motor 2, and a gear chamber Sb that houses the planetary reduction gear 4 and the differential mechanism 5.

[0087] The motor chamber Sa is formed on the inner side of the first housing 11 between the wall portion 120 of the second housing 12 and the wall portion 130 of the third housing 13.

[0088] The gear chamber Sb is formed on the inner diameter side of the fourth housing 14 between the wall portion 120 of the second housing 12 and the peripheral wall portion 141 of the fourth housing 14.

[0089] A plate component 8 is provided inside the gear chamber Sb.

[0090] Plate component 8 is fixed to the fourth housing 14 using bolt B.

[0091] The plate component 8 divides the gear chamber Sb into a first gear chamber Sb1 that houses the planetary reduction gear 4 and the differential mechanism 5, and a second gear chamber Sb2 that houses the parking locking mechanism 3.

[0092] In the direction of rotation axis X, the second gear chamber Sb2 is located between the first gear chamber Sb1 and the motor chamber Sa.

[0093] The motor 2 has a cylindrical motor shaft 20, a cylindrical rotor core 21 inserted into the motor shaft 20, and a stator core 25 that surrounds the outer periphery of the rotor core 21 at intervals.

[0094] Bearings B1 and B1 are inserted and fixed on both sides of the rotor core 21 in the motor shaft 20.

[0095] Viewed from the rotor core 21, the bearing B1 located at one end 20a of the motor shaft 20 (right side in the figure) is supported on the inner circumference of the motor support portion 135 of the third housing 13. The bearing B1 located at the other end 20b is supported on the inner circumference of the cylindrical motor support portion 125 of the second housing 12.

[0096] The motor support portions 135 and 125 are arranged opposite to one end 21a and the other end 21b of the rotor core 21 in the rotational axis X direction on the inner diameter side of the coil ends 253a and 253b, which will be described later.

[0097] The rotor core 21 is formed by stacking multiple silicon steel sheets. Each silicon steel sheet is inserted into the motor shaft 20 in a state that restricts relative rotation with respect to the motor shaft 20.

[0098] Viewed from the rotation axis X of the motor shaft 20, the silicon steel sheet forms a ring shape. On the outer periphery of the silicon steel sheet, magnets with N and S poles (not shown) are alternately arranged in the circumferential direction around the rotation axis X.

[0099] The stator core 25, which surrounds the outer periphery of the rotor core 21, is formed by stacking multiple electromagnetic steel plates. The stator core 25 is fixed to the inner periphery of the cylindrical support wall 111 of the first housing 11.

[0100] Each electromagnetic steel plate has an annular yoke 251 fixed to the inner circumference of the support wall 111 and a pole tooth 252 protruding from the inner circumference of the yoke 251 toward the rotor core 21.

[0101] In this embodiment, a stator core 25 is adopted, in which the windings 253 are distributed and wound across multiple pole teeth 252. Compared with the rotor core 21, the length of the stator core 25 in the rotation axis X direction is longer than that of the coil ends 253a and 253b protruding in the rotation axis X direction.

[0102] Alternatively, a stator core with a structure in which the winding is concentrated on each of the plurality of pole teeth 252 protruding toward the rotor core 21.

[0103] An opening 120a is provided in the wall portion 120 (motor support portion 125) of the second housing 12. The other end 20b of the motor shaft 20 passes through the opening 120a on the differential mechanism 5 side (left side in the figure) and is located inside the fourth housing 14.

[0104] The other end 20b of the motor shaft 20 is located inside the fourth housing 14 and is positioned opposite the side gear 54A, which will be described later, with a gap in the X direction of the rotation axis.

[0105] like Figure 3 As shown, a step portion 201 is provided on the motor shaft 20 in the area located within the fourth housing 14. The step portion 201 is located near the motor support portion 125. A lip seal RS supported on the inner circumference of the motor support portion 125 abuts against the outer circumference of the area between the step portion 201 and the bearing B1.

[0106] The lip seal RS divides the motor chamber Sa of the motor 2 and the gear chamber Sb in the fourth housing 14.

[0107] Oil OL (see reference) for lubricating the planetary reduction gear 4 and the differential mechanism 5 is sealed inside the fourth housing 14. Figure 2 ).

[0108] The lip seal RS is designed to prevent oil OL from flowing into the motor chamber Sa.

[0109] like Figure 3 As shown, on the motor shaft 20, the area from the stepped portion 201 to the vicinity of the other end 20b becomes a fitting portion 202 with splines provided on its outer periphery.

[0110] A parking gear 30 and a sun gear 41 are fitted into the spline of the fitting part 202.

[0111] In the parking gear 30, one side of the parking gear 30 in the rotation axis X direction abuts against the stepped portion 201 (right side in the figure). One end 410a of the cylindrical base 410 of the sun gear 41 abuts against the other side of the parking gear 30 (left side in the figure).

[0112] A nut N, which is screwed into the other end 20b of the motor shaft 20, is pressed into the other end 410b of the base 410 from the direction of the rotation axis X.

[0113] The sun gear 41 and the parking gear 30 are configured to not rotate relative to the motor shaft 20 when they are clamped between the nut N and the step portion 201.

[0114] Viewed from the X-axis of rotation, the sun gear 41 is positioned to coincide with the motor 2 described above.

[0115] The sun gear 41 has teeth 411 on the outer periphery of the other end 20b of the motor shaft 20. A large planetary gear 431 meshes with a stepped pinion 43 on the outer periphery of the teeth 411.

[0116] The stepped pinion 43 has a large planetary gear 431 that meshes with the sun gear 41 and a small planetary gear 432 with a smaller diameter than the large planetary gear 431.

[0117] The stepped pinion 43 is a gear part in which the large planetary gear 431 and the small planetary gear 432 are arranged and set as one piece in the direction of the axis X1 parallel to the rotation axis X.

[0118] The large planetary gear 431 is formed with an outer diameter R1 that is larger than the outer diameter R2 of the small planetary gear 432.

[0119] The stepped pinion 43 is positioned along the axis X1. In this state, the large planetary gear 431 is located on the side of motor 2 (right side in the figure).

[0120] The outer circumference of the planetary gear 432 meshes with the inner circumference of the gear ring 42. The gear ring 42 forms an annular shape that surrounds the rotation axis X at intervals. A plurality of engaging teeth 421 protruding radially outward are provided on the outer circumference of the gear ring 42. The plurality of engaging teeth 421 are spaced apart in the circumferential direction around the rotation axis X.

[0121] The gear ring 42 engages the engaging teeth 421 located on its outer periphery with the spline teeth 146a located on the support wall portion 146 of the fourth housing 14. The gear ring 42 restricts rotation about the rotation axis X.

[0122] The stepped pinion 43 has a through hole 430 that passes through the inner diameter side of the large planetary gear 431 and the small planetary gear 432 in the direction of axis X1.

[0123] The stepped pinion 43 is supported on the outer periphery of the pinion shaft 44 that passes through the through hole 430 so that it can rotate via the needle roller bearings NB, NB.

[0124] An intermediate spacer MS is provided between the needle roller bearing NB supporting the inner circumference of the large planetary gear 431 and the needle roller bearing NB supporting the inner circumference of the small planetary gear 432 on the outer circumference of the pinion shaft 44.

[0125] like Figure 4 As shown, an internal oil passage 440 is provided inside the pinion shaft 44. The internal oil passage 440 extends along the axis X1 from one end 44a of the pinion shaft 44 to the other end 44b.

[0126] Oil holes 442 and 443 are provided on the pinion shaft 44 to connect the internal oil passage 440 with the outer periphery of the pinion shaft 44.

[0127] Oil hole 443 is provided in the area of ​​needle roller bearing NB which supports the inner circumference of planetary gear 431.

[0128] Oil hole 442 is provided in the area of ​​needle roller bearing NB which supports the inner circumference of planetary gear 432.

[0129] On the pinion shaft 44, oil holes 443 and 442 are opened in the area where the stepped pinion 43 is inserted.

[0130] In addition, a guide passage 441 is provided on the pinion shaft 44 for guiding oil OL into the internal oil passage 440.

[0131] On the outer periphery of the pinion shaft 44, a guide passage 441 is formed in the region within the support hole 71a of the second housing portion 7, which will be described later. The guide passage 441 connects the internal oil passage 440 to the outer periphery of the pinion shaft 44.

[0132] An internal oil passage 781 is provided on the inner periphery of the support hole 71a. The internal oil passage 781 connects the outer periphery of the guide portion 78 protruding from the base 71 of the second housing portion 7 with the support hole 71a.

[0133] Viewed in section along axis X1, the oil passage 781 inside the housing is inclined relative to axis X1. The oil passage 781 inside the housing is inclined in the direction that approaches the slit 710 provided in the base 71 as it moves toward the rotation axis X side.

[0134] The oil OL scraped up by the differential housing 50 (described later) flows into the oil passage 781 inside the housing. The oil OL that moves to the outer diameter side flows into the oil passage 781 inside the housing due to the centrifugal force generated by the rotation of the differential housing 50.

[0135] Oil OL flows from the oil passage 781 inside the housing into the guide passage 441 and then into the internal oil passage 440 of the pinion shaft 44. The oil OL flowing into the internal oil passage 440 is discharged radially outward from the oil holes 442 and 443. The oil OL discharged from the oil holes 442 and 443 lubricates the needle roller bearing NB inserted into the pinion shaft 44.

[0136] On the pinion shaft 44, a through hole 444 is provided at a position on the other end 44b of the region where the guide path 441 is provided. The through hole 444 extends through the pinion shaft 44 in the diameter direction.

[0137] The pinion shaft 44 is configured such that the through hole 444 and the insertion hole 782 on the second housing portion 7 side, described later, are aligned in phase around the axis X1. The locating pin P, inserted into the insertion hole 782, passes through the through hole 444 of the pinion shaft 44. Accordingly, the pinion shaft 44 is supported on the second housing portion 7 side while restricting rotation around the axis X1.

[0138] like Figure 4 As shown, on one end 44a of the pinion shaft 44 in the long side direction, the area protruding from the stepped pinion 43 becomes the first shaft portion 445. The first shaft portion 445 is supported by a support hole 61a provided in the first housing portion 6 of the differential housing 50.

[0139] On the other end 44b of the pinion shaft 44 in the long side direction, the area protruding from the stepped pinion 43 becomes the second shaft portion 446. The second shaft portion 446 is supported by the support hole 71a provided in the second housing portion 7 of the differential housing 50.

[0140] Here, the first shaft portion 445 refers to the region on the side of one end 44a of the pinion shaft 44 where the stepped pinion 43 is not externally inserted. The second shaft portion 446 refers to the region on the side of the other end 44b of the pinion shaft 44 where the stepped pinion 43 is not externally inserted.

[0141] On the pinion shaft 44, the second shaft portion 446 is longer than the first shaft portion 445 in terms of length in the direction of axis X1.

[0142] The main structure of the differential mechanism 5 is described below.

[0143] Figure 5 This is a perspective view of the differential housing 50 surrounding the differential mechanism 5.

[0144] Figure 6 This is an exploded perspective view of the differential housing 50 surrounding the differential mechanism 5.

[0145] like Figures 4-6 As shown, the differential housing 50, which serves as the housing, houses the differential mechanism 5. The differential housing 50 is formed by assembling a first housing portion 6 and a second housing portion 7 in the direction of the rotation axis X. In this embodiment, the first housing portion 6 and the second housing portion 7 of the differential housing 50 function as planetary gear carriers, supporting the pinion shaft 44 (stepped pinion 43) of the planetary reduction gear 4.

[0146] like Figure 6 As shown, three pinion gears 52 and three pinion gear shafts 51 are provided between the first housing portion 6 and the second housing portion 7 of the differential housing 50. The pinion gear shafts 51 are arranged at equal intervals in the circumferential direction around the rotation axis X (see reference). Figure 6 ).

[0147] The inner diameter ends of the pinion and the shaft 51 are connected to a common connecting part 510.

[0148] One pinion gear 52 is inserted externally on each of the pinion gear shafts 51. Each pinion gear 52 contacts the connecting part 510 from the radially outer side of the rotating shaft X.

[0149] In this state, each of the pinion gears 52 is rotatably supported by the pinion gear shaft 51.

[0150] like Figure 4 As shown, a spherical washer 53 is inserted onto the pinion mating shaft 51. The spherical washer 53 is in contact with the spherical outer periphery of the pinion mating gear 52.

[0151] On the differential housing 50, side gear 54A is located on one side of the connecting portion 510 in the X direction of the rotation axis, and side gear 54B is located on the other side. Side gear 54A is rotatably supported by the first housing portion 6. Side gear 54B is rotatably supported by the second housing portion 7.

[0152] Side gear 54A meshes with three pinion gears 52 from one side of the rotation axis X. Side gear 54B meshes with three pinion gears 52 from the other side of the rotation axis X.

[0153] Figures 7-10 This is a diagram illustrating the first housing part 6.

[0154] Figure 7 This is a perspective view of the first housing part 6 as seen from the side of the second housing part 7.

[0155] Figure 8 This is a top view of the first housing part 6 as seen from the side of the second housing part 7.

[0156] Figure 9 yes Figure 8 A schematic diagram of section A-A in the diagram. Figure 9 In the diagram, the configuration of the pinion mating shaft 51 and the pinion mating gear 52 is represented by virtual lines.

[0157] Figure 10 yes Figure 8 A schematic diagram of section A-A in the diagram. Figure 10 The diagram of the connecting beam 62 on the depth side of the paper is omitted, and the configuration of the side gear 54A, the stepped pinion 43, and the drive shaft 9A is represented by virtual lines.

[0158] like Figure 7 and Figure 8 As shown, the first housing portion 6 has an annular base 61. The base 61 is a plate-shaped member having a thickness W61 in the direction of the rotation axis X.

[0159] like Figure 9 and Figure 10 As shown, an opening 60 is provided in the center of the base 61. A cylindrical wall portion 611 surrounding the opening 60 is provided on the surface of the base 61 opposite to the second housing portion 7 (right side in the figure). The outer periphery of the cylindrical wall portion 611 is supported by the plate member 8 via the bearing B3 (see reference). Figure 2 ).

[0160] Three connecting beams 62 extending to the second housing portion 7 side are provided on the surface of the base 61 (left side in the figure).

[0161] Connecting beams 62 are arranged at equal intervals in the circumferential direction about the axis of rotation X (see reference). Figure 7 and Figure 8 ).

[0162] The connecting beam 62 has a base 63 orthogonal to the base 61 and a connecting portion 64 wider than the base 63.

[0163] like Figure 9 As shown, the front end face 64a of the connecting part 64 is a flat surface orthogonal to the rotation axis X, and a support groove 65 for supporting the pinion mating shaft 51 is provided on the front end face 64a.

[0164] like Figure 8 As shown, viewed from the rotation axis X, the support groove 65 is formed in a straight line along the radius line L of the annular base 61. The support groove 65 transversely cuts the central portion of the circumferential connecting portion 64 around the rotation axis X from the inner diameter side to the outer diameter side.

[0165] like Figure 9 and Figure 10As shown, the support groove 65 is a semicircle along the outer diameter of the pinion mating shaft 51. The support groove 65 is formed with a depth capable of accommodating half of the cylindrical pinion mating shaft 51. That is, the support groove 65 is formed with a depth equivalent to half the diameter Da of the pinion mating shaft 51 (=Da / 2).

[0166] On the inner diameter side (rotation axis X side) of the connecting portion 64, an arc portion 641 is formed in a shape that follows the outer periphery of the pinion meshing gear 52.

[0167] In the arc portion 641, the outer periphery of the pinion gear 52 is supported by a spherical washer 53.

[0168] In the arc portion 641, an oil groove 642 is provided along the aforementioned radius line L. The oil groove 642 is provided in the range from the support groove 65 of the pinion mating shaft 51 to the gear support portion 66 fixed to the inner circumference of the connecting portion 64.

[0169] The gear support portion 66 is connected to the boundary portion of the base portion 63 and the connecting portion 64. The gear support portion 66 is arranged in an orientation orthogonal to the rotation axis X. The gear support portion 66 has a through hole 660 in its central portion.

[0170] like Figure 8 As shown, the outer periphery of the gear support portion 66 is connected to the inner periphery of the three connecting portions 64. In this state, the center of the through hole 660 is located on the rotation axis X.

[0171] like Figure 9 and Figure 10 As shown, a recess 661 surrounding the through hole 660 is provided on the surface opposite to the base 61 (left side in the figure) in the gear support portion 66. An annular washer 55 of the back side of the support-side gear 54A is received in the recess 661.

[0172] A cylindrical wall portion 541 is provided on the back of the side gear 54A. A washer 55 is inserted into the cylindrical wall portion 541.

[0173] Viewed from the rotation axis X, three oil grooves 662 are provided on the surface of the recess 661 in the gear support 66. The oil grooves 662 are spaced apart in the circumferential direction around the rotation axis X.

[0174] The oil groove 662 extends from the inner circumference of the gear support portion 66 to the outer circumference along the aforementioned radius line L. The oil groove 662 is connected to the oil groove 642 on the side of the aforementioned arc portion 641.

[0175] like Figure 7 and Figure 8 As shown, a support hole 61a for a pinion shaft 44 is provided in the base 61. The support hole 61a is provided in the region between connecting beams 62, 62, which are arranged at intervals around the rotation axis X in the circumferential direction.

[0176] A boss 616 surrounding the support hole 61a is provided on the base 61. A washer Wc (see reference) is inserted into the pinion shaft 44. Figure 10 It contacts the boss portion 616 from the rotation axis X direction.

[0177] An oil groove 617 is provided at the base 61, extending from the central opening 60 to the boss portion 616.

[0178] like Figure 8 As shown, the oil groove 617 is formed with a front end that tapers in width in the circumferential direction around the rotation axis X as it approaches the boss portion 616. The oil groove 617 is connected to the oil groove 618 provided on the boss portion 616.

[0179] Bolt holes 67 and 67 are provided on both sides of the connecting part 64 and the support groove 65.

[0180] The connecting portion 74 on the side of the second housing portion 7 engages with the connecting portion 64 of the first housing portion 6 in the direction of the rotation axis X. The first housing portion 6 and the second housing portion 7 are engaged with each other by screwing the bolt B, which passes through the connecting portion on the side of the second housing portion 7, into the bolt holes 67, 67.

[0181] Figures 11-16 This is a diagram illustrating the second housing part 7.

[0182] Figure 11 This is a perspective view of the second housing part 7 as seen from the side of the first housing part 6.

[0183] Figure 12 This is a top view of the second housing part 7 as seen from the side of the first housing part 6.

[0184] Figure 13 yes Figure 12 A schematic diagram of section A-A in the diagram. Figure 13 In the diagram, the configuration of the pinion mating shaft 51 and the pinion mating gear 52 is represented by virtual lines.

[0185] Figure 14 yes Figure 12 A schematic diagram of section A-A in the diagram. Figure 14 The diagram of the connecting part 74 on the depth side of the paper is omitted, and the arrangement of the side gear 54B, the stepped pinion 43, and the drive shaft 9B is shown with virtual lines.

[0186] Figure 15 This is a perspective view of the second housing part 7 viewed from the side opposite to the first housing part 6.

[0187] Figure 16 This is a top view of the second housing part 7 viewed from the side opposite to the first housing part 6.

[0188] like Figure 13 and Figure 14 As shown, the second housing portion 7 has an annular base portion 71.

[0189] The base 71 is a plate-shaped component with a thickness W71 in the direction of the rotation axis X.

[0190] A through hole 70 is provided in the center of the base 71, which extends through the base 71 in the thickness direction.

[0191] On the surface of the base 71 opposite to the first housing portion 6 (left side in the figure), there is a cylindrical wall portion 72 surrounding the through hole 70 and a peripheral wall portion 73 surrounding the cylindrical wall portion 72 at intervals.

[0192] A protrusion 73a is provided at the front end of the peripheral wall portion 73, protruding toward the rotation axis X. The protrusion 73a is provided all around the circumference of the rotation axis X.

[0193] like Figure 16 As shown, three support holes 71a for the pinion shaft 44 are provided on the outer diameter side of the peripheral wall portion 73. The support holes 71a are spaced apart in the circumferential direction around the rotation axis X.

[0194] Three slits 710 extending through the base 71 along the thickness direction are provided on the inner diameter side of the peripheral wall portion 73.

[0195] Viewed from the rotation axis X, the slit 710 forms an arc along the inner circumference of the peripheral wall portion 73. The slit 710 is formed within a specified angular range in the circumferential direction about the rotation axis X.

[0196] In the second housing portion 7, slits 710 are provided at intervals in the circumferential direction about the rotation axis X. Each slit 710 is provided transversely to the inner diameter side of the support hole 71a in the circumferential direction about the rotation axis X.

[0197] Three protruding walls 711 are provided between adjacent slits 710, 710 in the circumferential direction around the rotation axis X, protruding toward the paper surface and front side. The protruding walls 711 extend in a straight line in the radial direction of the rotation axis X. The protruding walls 711 are provided across the peripheral wall portion 73 on the outer diameter side and the cylindrical wall portion 72 on the inner diameter side.

[0198] Three protruding walls 711 are arranged at intervals around the rotation axis X. The protruding walls 711 are arranged approximately 45 degrees out of phase with respect to the slit 710 around the rotation axis X.

[0199] On the outer diameter side of the peripheral wall portion 73, bolt receiving portions 76, 76 are provided between adjacent support holes 71a, 71a in the circumferential direction around the rotation axis X, recessed towards the depth of the paper surface. These bolt receiving portions 76, 76 are arranged in a symmetrical positional relationship, with the radius line L sandwiched in the middle. The bolt receiving portion 76 is formed on the outer periphery 71c of the base portion 71.

[0200] A bolt insertion hole 77 is provided on the inner side of the bolt receiving part 76. The insertion hole 77 penetrates the base 71 in the thickness direction (rotation axis X direction).

[0201] like Figure 11 and Figure 12 As shown, three connecting portions 74 protruding toward the first housing portion 6 are provided on the surface of the base 71 on the side of the first housing portion 6 (right side in the figure).

[0202] The connecting portions 74 are provided at equal intervals in the circumferential direction about the rotation axis X. The connecting portions 74 are formed with a circumferential width W7 that is the same as that of the connecting portions 64 on the first housing portion 6 side.

[0203] like Figure 13 As shown, the front end face 74a of the connecting part 74 is a flat surface orthogonal to the rotation axis X. A support groove 75 for supporting the pinion mating shaft 51 is provided on the front end face 74a.

[0204] like Figure 12 As shown, viewed from the rotation axis X direction, the support groove 75 is formed in a straight line along the radius line L of the base 71. The support groove 75 is formed by transversely cutting the connecting portion 74 from the inner diameter side to the outer diameter side.

[0205] like Figure 5 As shown, the support groove 75 forms a semicircle along the outer diameter of the pinion mating shaft 51.

[0206] like Figure 13 As shown, the support groove 75 is formed to a depth that can accommodate half of the cylindrical pinion shaft 51. That is, the support groove 75 is formed to a depth that is equivalent to half the diameter Da of the pinion shaft 51 (=Da / 2).

[0207] An arcuate portion 741 is provided on the inner diameter side (rotation shaft X side) of the connecting portion 74, which runs along the outer periphery of the pinion meshing gear 52.

[0208] In the arc portion 741, the outer periphery of the pinion gear 52 is supported by a spherical washer 53 (see reference). Figure 13 and Figure 14 ).

[0209] In the arc portion 741, an oil groove 742 is provided along the aforementioned radius line L. The oil groove 742 is provided from the support groove 75 of the pinion mating shaft 51 to the base 71 located on the inner periphery of the connecting portion 74.

[0210] The oil groove 742 is connected to the oil groove 712 provided on the surface 71b of the base 71. Viewed from the rotation axis X direction, the oil groove 712 is provided along the radius line L and forms a through hole 70 provided on the base 71.

[0211] An annular washer 55 supporting the back of the side gear 54B is mounted on the surface 71b of the base 71. A cylindrical wall portion 540 is provided on the back of the side gear 54B. The washer 55 is inserted into the cylindrical wall portion 540.

[0212] An oil groove 721 is formed on the inner periphery of the cylindrical wall portion 72 surrounding the through hole 70 at a position where it intersects with the oil groove 712. The oil groove 721 is provided on the inner periphery of the cylindrical wall portion 72 along the direction of the rotation axis X, extending the total length of the cylindrical wall portion 72 in the direction of the rotation axis X.

[0213] like Figure 11 and Figure 12 As shown, a guide portion 78 is provided at the base 71 of the second housing portion 7, between adjacent connecting portions 74, 74 in the circumferential direction about the rotation axis X. The guide portion 78 protrudes toward the side of the first housing portion 6 (the front side of the paper).

[0214] Viewed from the rotation axis X, the guide portion 78 is cylindrical. The guide portion 78 surrounds the support hole 71a provided in the base 71. The outer periphery of the guide portion 78 is cut off along the outer periphery 71c of the base 71.

[0215] like Figure 13 and Figure 14 As shown, viewed in a cross section along axis X1, the pinion shaft 44 is inserted from the first housing portion 6 into the support hole 71a of the guide portion 78. The pinion shaft 44 is positioned by means of the locating pin P, which restricts its rotation about axis X1.

[0216] In this state, the planetary gear 432 of the stepped pinion 43 inserted into the pinion shaft 44 clamps the washer Wc in the middle and abuts against the guide portion 78 from the axis X1 direction.

[0217] like Figure 4 As shown, in the differential housing 50, a bearing B2 is inserted outside the cylindrical wall portion 72 of the second housing portion 7. The bearing B2 inserted outside the cylindrical wall portion 72 is held by the support portion 145 of the fourth housing 14. The cylindrical wall portion 72 of the differential housing 50 is rotatably supported by the fourth housing 14 via the bearing B2.

[0218] The drive shaft 9B, which passes through the opening 145a of the fourth housing 14, is inserted into the support portion 145 from the rotation axis X direction. The drive shaft 9B is rotatably supported by the support portion 145.

[0219] A lip seal RS is fixed to the inner circumference of the opening 145a. The lip of the lip seal RS (not shown) is in elastic contact with the outer circumference of the cylinder wall portion 540 of the side gear 54B inserted into the drive shaft 9B.

[0220] As a result, the gap between the outer periphery of the cylinder wall portion 540 of the side gear 54B and the inner periphery of the opening portion 145a is sealed.

[0221] The first housing portion 6 of the differential housing 50 is supported by the plate component 8 via the bearing B3 inserted into the cylinder wall portion 611 (see reference). Figure 2 ).

[0222] The drive shaft 9A, which passes through the insertion hole 130a of the third housing 13, is inserted into the interior of the first housing part 6 from the rotation axis X direction.

[0223] The drive shaft 9A is arranged to cut across the inner diameter side of the motor shaft 20 of the motor 2 and the sun gear 41 of the planetary reduction gear 4 in the X direction of the rotation axis.

[0224] like Figure 4 As shown, inside the differential housing 50, side gears 54A and 54B are splinedly fitted onto the outer periphery of the front end of the drive shafts 9 (9A, 9B). The side gears 54A and 54B and the drive shafts 9 (9A, 9B) are connected to be able to rotate as a whole around the rotation axis X.

[0225] In this state, the side gears 54A and 54B are arranged opposite each other at a distance in the direction of rotation axis X, and the connecting part 510 of the pinion mating shaft 51 is located between the side gears 54A and 54B.

[0226] In this embodiment, a total of three pinion gear mating shafts 51 extend radially outward from the connecting portion 510. A pinion gear mating gear 52 is supported on each of the pinion gear mating shafts 51. The pinion gear mating gears 52 are assembled to a side gear 54A located on one side in the rotation axis X direction and a side gear 54B located on the other side in a state where their teeth are meshed.

[0227] like Figure 2 As shown, lubricating oil OL is stored inside the fourth housing 14. The lower side of the differential housing 50 is located inside the stored oil OL.

[0228] In this embodiment, when the connecting beam 62 is at its lowest position, oil OL is stored up to the height at which the connecting beam 62 is located within oil OL.

[0229] When the output of the transmission motor 2 rotates, the stored oil OL is scraped up by the differential housing 50, which rotates around the rotating shaft X.

[0230] Figures 17-22 This is a diagram illustrating the oil collection section 15.

[0231] Figure 17 This is a top view of the fourth box 14 as seen from the side of the third box 13.

[0232] Figure 18 Viewed from an oblique angle Figure 17 A perspective view of the oil collecting section 15 shown.

[0233] Figure 19 This is a top view of the fourth box 14 as seen from the side of the third box 13. Figure 19 This indicates that a differential housing 50 is configured.

[0234] Figure 20 Viewed from an oblique angle Figure 19 A perspective view of the oil collecting section 15 shown.

[0235] Figure 21 yes Figure 19 A schematic diagram of section A-A in the diagram.

[0236] Figure 22 This is a schematic diagram illustrating the positional relationship between the oil collection section 15 and the differential housing 50 (first housing section 6, second housing section 7) when viewed from above.

[0237] In addition, Figure 17 and Figure 19 In order to make the positions of the joint 142 and the support wall 146 of the fourth housing 14 clear, they are marked with shaded areas.

[0238] like Figure 17 As shown, viewed from the rotation axis X, a support wall 146 is provided in the fourth housing 14, which surrounds the central opening 145a at intervals. The inner side of the support wall 146 (rotation axis X) becomes the differential housing 50 (see reference). Figure 19 ) containment department 140.

[0239] The upper part of the fourth housing 14 forms a space for an oil collection section 15 and a space for a ventilation chamber 16.

[0240] In the support wall portion 146 of the fourth housing 14, a communication port 147 is provided in the area where it intersects with the vertical line VL, so that the oil collection portion 15 communicates with the receiving portion 140 of the differential housing 50.

[0241] like Figure 17 As shown, the oil collecting section 15 and the venting chamber 16 are located on one side (left side in the figure) and the other side (right side in the figure) of the vertical line VL that is orthogonal to the rotation axis X.

[0242] The oil collection section 15 is positioned offset from the vertical line VL passing through the rotation center (rotation shaft X) of the differential housing 50. For example... Figure 22 As shown, when viewed from above, the oil collection section 15 is positioned offset from directly above the differential housing 50.

[0243] Here, the plumb line VL is the plumb line VL that sets the installation state of the power transmission device 1 on the vehicle as a reference. When viewed from the rotation axis X direction, the plumb line VL is orthogonal to the rotation axis X.

[0244] Furthermore, in the following description, the horizontal line HL is the horizontal line HL with the installation state of the power transmission device 1 on the vehicle as a reference. Viewed from the rotation axis X direction, the horizontal line HL is orthogonal to the rotation axis X (see reference). Figure 17 ).

[0245] like Figure 18 As shown, the oil collecting section 15 is formed to reach the paper surface depth side of the support wall section 146. A support platform section 151 is provided at the lower edge of the oil collecting section 15, protruding towards the paper surface and front side. The support platform section 151 is located within a range that extends from the support wall section 146 towards the paper surface and front side, and from the joint portion 142 of the fourth housing 14 towards the paper surface depth side.

[0246] like Figure 17 As shown, viewed from the rotation axis X direction, a communication port 147 is formed on the vertical VL side (right side in the figure) of the oil collecting section 15, which connects the oil collecting section 15 to the receiving section 140 of the differential housing 50. The communication port 147 is formed by a portion of the cut support wall section 146.

[0247] Viewed from the rotation axis X direction, the connecting port 147 is located in the range that crosses the vertical line VL from the side of the vent chamber 16 (right side in the figure) to the side of the oil collection section 15 (left side in the figure).

[0248] like Figure 19 As shown, in this embodiment, when the vehicle equipped with the power transmission device 1 is moving forward, viewed from the side of the third housing 13, the differential housing 50 rotates in a counterclockwise direction CCW about the rotation axis X.

[0249] Therefore, the oil collecting section 15 is located downstream in the rotational direction of the differential housing 50. Furthermore, in terms of the circumferential width of the connecting port 147, the left side, which encloses the vertical line VL, is wider than the right side. The left side, which encloses the vertical line VL, is downstream in the rotational direction of the differential housing 50, and the right side is upstream. Thus, most of the oil OL scraped up by the differential housing 50 rotating around the rotation axis X can flow into the oil collecting section 15. That is, the oil collecting section 15 functions as an oil supply section that guides the scraped oil OL.

[0250] In addition, such as Figure 22As shown, the outer circumferential position of the rotational track of the second shaft portion 446 of the aforementioned pinion shaft 44 and the outer circumferential position of the rotational track of the large planetary gear 431 are offset radially from each other along the rotation axis X. The outer circumferential position of the rotational track of the second shaft portion 446 is located closer to the inner diameter than the outer circumferential position of the rotational track of the large planetary gear 431. Therefore, there is ample space on the outer diameter side of the second shaft portion 446. By utilizing this space to install the oil collection section 15, the space within the main housing 10 can be effectively utilized.

[0251] Furthermore, viewed from the motor 2, the second shaft portion 446 protrudes towards the depth side of the planetary gear 432. The peripheral components of the second shaft portion 446 (e.g., the guide portion 78 of the differential housing 50 supporting the second shaft portion 446) are positioned close to the oil collection portion 15.

[0252] Therefore, the supply of oil OL (lubricating oil) from the peripheral components to the oil collection section 15 can be carried out smoothly.

[0253] like Figure 18 As shown, an oil hole 151a is provided at its outer diameter end on the depth side of the support platform 151. The oil hole 151a extends to its inner diameter side within the fourth housing 14. The inner diameter end of the oil hole 151a is located on the inner circumference of the support portion 145.

[0254] like Figure 2 As shown, in the support portion 145, the end of the oil hole 151a on the inner diameter side is opened between the lip seal RS and the bearing B2.

[0255] like Figure 20 and Figure 22 As shown, an oil guide 152 is mounted on the support platform 151.

[0256] The oil guide 152 has an oil baffle 153 and extends from the oil baffle 153 to the side of the first housing 11. Figure 20 The guide section 154 (on the paper surface and the front side).

[0257] like Figure 22 As shown, viewed from above, the support platform 151 is positioned radially outward of the rotating shaft X and overlaps with a portion of the differential housing 50 (first housing portion 6, second housing portion 7) to avoid interference with the stepped pinion 43 (large planetary gear 431).

[0258] Viewed radially from the rotation axis X, the oil baffle 153 is positioned to coincide with the second shaft portion 446 of the pinion shaft 44. Additionally, the guide portion 154 is positioned to coincide with the first shaft portion 445 of the pinion shaft 44 and the large planetary gear 431.

[0259] Therefore, when the differential housing 50 rotates around the rotating shaft X, the oil OL scraped up by the differential housing 50 moves toward the oil baffle 153 and the guide 154.

[0260] like Figure 20 As shown, a wall portion 153a extending in the upward direction away from the support platform portion 151 is provided on the outer periphery of the oil baffle portion 153. A portion of the oil OL scraped up by the differential housing 50 rotating about the rotation axis X is stored in the oil guide member 152.

[0261] On the depth side of the oil baffle 153 ( Figure 20 On the paper depth side), a cutout 155 is provided on the wall portion 153a.

[0262] like Figure 22 As shown, the cutout portion 155 is provided in the area opposite to the oil hole 151a. A portion of the oil OL stored in the oil blocking portion 153 is discharged from a portion of the cutout portion 155 into the oil hole 151a.

[0263] like Figure 21 As shown, the guide portion 154 tilts downward as it moves away from the oil baffle portion 153.

[0264] like Figure 20 As shown, wall portions 154a and 154a are provided on both sides of the guide portion 154 in the width direction. The wall portions 154a and 154a are provided along the total length of the guide portion 154 in the long side direction. The wall portions 154a and 154a are connected to the wall portion 153a surrounding the outer periphery of the oil baffle portion 153.

[0265] A portion of the oil OL stored in the oil baffle 153 is also discharged toward the guide section 154.

[0266] like Figure 21 As shown, the guide portion 154 extends toward the second housing 12 at a position that avoids interference with the differential housing 50. The front end 154b of the guide portion 154 is positioned opposite the oil hole 126a provided in the wall portion 120 of the second housing 12, separated by a gap in the rotation axis X direction.

[0267] A boss 126 surrounding the oil hole 126a is provided on the outer periphery of the wall portion 120. One end of the pipe 127 is inserted into the boss 126 from the rotation axis X direction.

[0268] Pipe 127 passes through the outside of the second housing 12 and reaches the third housing 13. The other end of pipe 127 connects to an oil hole 136a (see reference) in the cylindrical connecting wall 136 of the third housing. Figure 2 Connect.

[0269] like Figure 19 As shown, a portion of the oil OL scraped up by the differential housing 50, which rotates around the rotation axis X, reaches the oil collection section 15. (As shown...) Figure 21 As shown, oil OL is supplied to the internal space Sc of the connecting wall 136 (see reference) via guide 154 and pipe 127. Figure 2 ).

[0270] like Figure 2 As shown, a radial oil passage 137 communicating with the internal space Sc is provided in the third housing 13.

[0271] The radial oil passage 137 extends radially downward from the internal space Sc. The radial oil passage 137 communicates with the axial oil passage 138 provided in the joint 132.

[0272] The axial oil passage 138 is connected to the oil storage section 128 located at the lower part of the second housing 12 via a communication hole 112a provided in the joint 112 of the first housing 11.

[0273] The oil storage section 128 extends through the peripheral wall section 121 along the rotation axis X. The oil storage section 128 is connected to the gear chamber Sb provided in the fourth housing 14.

[0274] In the gear chamber Sb, the circular plate member 8 is arranged in an orientation orthogonal to the rotation axis X. As described above, the plate member 8 divides the gear chamber Sb within the fourth housing 14 into a first gear chamber Sb1 on the differential housing 50 side and a second gear chamber Sb2 on the motor 2 side.

[0275] Figure 23 and Figure 24 This is a diagram of component 8 on the instruction panel.

[0276] Figure 23 This is a top view of panel component 8 viewed from the motor 2 side.

[0277] Figure 24 yes Figure 23 A schematic diagram of section A-A in the diagram.

[0278] like Figure 23 As shown, viewed from the motor 2 side, the plate member 8 has an annular base 80. An annular support portion 801 surrounding the through hole 800 is provided at the center of the base 80.

[0279] like Figure 3 As shown, the cylinder wall portion 611 of the differential housing 50 is supported on the inner periphery of the support portion 801 via the bearing B3.

[0280] like Figure 23 As shown, connecting pieces 81, 82, 83, and 84 are provided on the outer periphery 80c of the base 80.

[0281] Connecting pieces 81, 82, 83, and 84 each extend radially outward from the outer periphery 80c of the base 80. Bolt holes 81a, 82a, 83a, and 84a are respectively provided on the connecting pieces 81, 82, 83, and 84.

[0282] The connecting piece 81 is provided on the upper part of the plate member 8 at a position where it intersects the vertical line VL. The connecting piece 81 extends along the vertical line VL in a direction away from the base 80.

[0283] On one side of the vertical line VL ( Figure 23 On the left side of the base 80, a connecting piece 82 and a connecting piece 83 are respectively provided on the upper and lower sides of the horizontal line HL. These connecting pieces 82 and 83 also extend away from the base 80.

[0284] On the other side of the vertical line VL ( Figure 23 On the right side of the horizontal line HL, a connecting piece 84 is provided at a position lower than the horizontal line HL. This connecting piece 84 passes through the lower edge of the aforementioned connecting piece 83 below the horizontal line HL. The connecting piece 84 protrudes downward from a position where it intersects with a straight line HLa parallel to the horizontal line HL.

[0285] On the other side of the vertical line VL ( Figure 23 On the right side of the axis (HL), a connecting piece 85 is provided, positioned above the horizontal line HL. The connecting piece 85 has a specified width in the circumferential direction about the rotation axis X. A bolt hole 85a is provided on the connecting piece 85 near the vertical line VL. A support pin 85b is provided near the horizontal line HL.

[0286] Figure 25 This is a diagram showing the fourth housing 14 as viewed from the motor side. Figure 25 The arrangement of the stepped portions 148d, 149d, and 17d on the outer periphery of the support plate component 8 is shown.

[0287] In addition, Figure 25 In order to make the positions of the peripheral wall parts 148, 149, the arc-shaped wall part 17, and the step parts 148d, 149d, and 17d clear, they are marked with shades.

[0288] Figure 26 This is a diagram illustrating the configuration of component 8 on the instruction panel.

[0289] Figure 26 This is a diagram showing the fourth housing 14 as viewed from the motor side. Figure 26 The image shows the state in which the plate component 8 is installed on the fourth housing 14.

[0290] Figure 27 This diagram illustrates the movement of oil OL, which is scraped up by the stepped pinion 43. Figure 27The image shows the movement of oil OL when a vehicle equipped with a power transmission device 1 is moving forward.

[0291] like Figure 25 As shown, viewed from the rotation axis X direction, peripheral wall portions 148 and 149 are provided in the fourth housing 14. These peripheral wall portions 148 and 149 are located on the outer diameter side of the area of ​​the support wall portion 146 where the toothed portion 146a is provided.

[0292] The peripheral wall portions 148 and 149 are formed into an arc shape centered on the rotation axis X.

[0293] The peripheral wall portion 148 is located downstream of the peripheral wall portion 149 in the circumferential direction of the stepped pinion 43, which rotates integrally with the differential housing 50, about the rotation axis X (revolution axis). In the fourth housing 14, the peripheral wall portions 148 and 149 constitute the downstream side wall portion and the upstream side wall portion, respectively.

[0294] The peripheral wall portion 148 is located below the oil collecting portion 15 in the vertical direction VL.

[0295] The peripheral wall portion 148 is formed in the circumferential direction of the stepped pinion 43 about the rotation axis X (revolution axis) to reach the lower side of the oil collection portion 15 from a position downstream of the communication port 147.

[0296] The connecting port 147 is the area that connects the oil collecting part 15 with the receiving part 140 of the differential housing 50 (see reference). Figure 17 ).

[0297] Viewed from the rotation axis X direction, the peripheral wall portion 148 is located within the range of the horizontal line HL that cuts across the rotation axis X from the top to the bottom.

[0298] The upper end 148a of the peripheral wall portion 148 is located near the support platform portion 151. The lower end 148b of the peripheral wall portion 148 is located near the straight line HLa.

[0299] like Figure 25 As shown, viewed from the rotation axis X, the inner circumferential surface 148c of the peripheral wall portion 148 forms an arc shape along the outer circumference of the aforementioned plate member 8 (base 80). The inner diameter of the inner circumferential surface 148c of the peripheral wall portion 148, based on the rotation axis X, is slightly larger than the outer diameter of the plate member 8, based on the rotation axis X.

[0300] A stepped portion 148d is provided on the inner side of the peripheral wall portion 148, which is recessed towards the depth side of the paper surface.

[0301] When the plate component 8 is installed in the fourth housing 14, the outer periphery of the plate component 8 (base 80) abuts against the step portion 148d. The plate component 8 (base 80) abuts against the step portion 148d in the direction of the rotation axis X.

[0302] Two bosses 18 with bolt holes 18a are provided on the outer side of the peripheral wall portion 148. The bosses 18 are integrally formed with the peripheral wall portion 148. The bosses 18 are respectively located near the upper end 148a side and the lower end 148b side of the peripheral wall portion 148. The bosses 18 protrude beyond the peripheral wall portion 148 and are closer to the front side of the paper surface.

[0303] The peripheral wall portion 149 is located below the aforementioned ventilation chamber 16. The peripheral wall portion 149 is located on the side closer to the paper surface depth than the wall portion 160 that forms the ventilation chamber 16. The peripheral wall portion 149 is located upstream of the connecting port 147 in the circumferential direction of the stepped pinion 43 about the rotation axis X (revolution axis).

[0304] Viewed from the rotation axis X, the upper end 149a of the peripheral wall portion 149 is connected to the boss portion 18 on the vertical line VL. A side wall portion 159 extending towards the oil collection portion 15 is also connected to the boss portion 18. The lower end 149b of the peripheral wall portion 149 is connected to the peripheral wall portion 141 of the fourth housing 14 on the lower side of the vent chamber 16.

[0305] like Figure 25 As shown, viewed from the rotation axis X, the inner periphery 149c of the peripheral wall portion 149 forms an arc shape along the outer periphery of the aforementioned plate member 8 (base 80). The inner diameter of the inner periphery 149c of the peripheral wall portion 149, based on the rotation axis X, is slightly larger than the outer diameter of the plate member 8, based on the rotation axis X.

[0306] A stepped portion 149d is provided on the inner side of the peripheral wall portion 149, which is recessed towards the depth side of the paper surface.

[0307] When the plate component 8 is installed in the fourth housing 14, the outer periphery of the plate component 8 (base 80) abuts against the step portion 149d. The plate component 8 (base 80) abuts against the step portion 149d in the direction of the rotation axis X.

[0308] Two bosses 18 with bolt holes 18a are provided on the outer side of the peripheral wall portion 149. The bosses 18 are integrally formed with the peripheral wall portion 149. The bosses 18 are spaced apart in the circumferential direction about the rotation axis X. The bosses 18 are respectively provided on the outer periphery of the upper end 148a of the peripheral wall portion 149 and on the outer periphery of the region located on the lower side of the vent chamber 16.

[0309] The bosses 18 and 18 protrude to the front side of the paper surface, which is closer to the peripheral wall 149.

[0310] In the fourth housing 14, an arc-shaped wall portion 17 is provided in the area below the ventilation chamber 16 and below the horizontal line HL. The arc-shaped wall portion 17 is positioned approximately 180° out of phase with respect to the peripheral wall portion 148 in the circumferential direction about the rotation axis X.

[0311] like Figure 25 As shown, viewed from the rotation axis X, the inner periphery 17c of the arc-shaped wall portion 17 forms an arc along the outer periphery of the aforementioned plate member 8 (base 80). The inner diameter of the inner periphery 17c of the arc-shaped wall portion 17, based on the rotation axis X, is slightly larger than the outer diameter of the plate member 8, based on the rotation axis X.

[0312] In the arc-shaped wall portion 17, a boss portion 18 with a bolt hole 18a is formed at the position where it intersects with the aforementioned straight line HLa. The boss portion 18 protrudes towards the front side of the paper surface of the arc-shaped wall portion 17.

[0313] On the inner periphery of the boss portion 18, a stepped portion 17d protrudes in the direction of the rotation axis X.

[0314] When the plate component 8 is installed in the fourth housing 14, the outer periphery of the plate component 8 (base 80) abuts against the step portion 17d. The plate component 8 (base 80) abuts against the step portion 17d in the direction of the rotation axis X.

[0315] Regarding the installation of the plate member 8 onto the fourth housing 14, firstly, the outer periphery of the plate member 8 (base 80) is brought into contact with the stepped portions 148d and 149d of the peripheral walls 148 and 149 and the stepped portion 17d of the arc-shaped wall 17 in the direction of the rotation axis X. Next, the bolts B, which pass through the bolt holes 81a to 85a of the connecting pieces 81 to 85, are screwed into the bolt holes 18a of the corresponding boss portion 18. Thus, the plate member 8 is fixed to the fourth housing 14 (see reference). Figure 26 ).

[0316] like Figure 26 As shown, in the vertical line VL direction with the power transmission device 1 mounted on the vehicle as the reference, the lowest part 80c' of the outer periphery 80c of the plate member 8 is provided between the bottom 143 of the fourth housing 14 and separated by a gap CL.

[0317] like Figure 27 As shown, viewed from the motor 2 side, the plate member 8 is configured to cover the differential housing 50 and the side of the large planetary gear 431 protruding from the outer periphery of the differential housing 50. Furthermore, the area of ​​the large planetary gear 431 protruding from the outer periphery of the differential housing 50 is positioned to coincide with the support wall portion 146.

[0318] Therefore, when viewed from the rotation axis X direction, the plate component 8 is positioned to coincide with the differential housing 50, the stepped pinion 43, and the support wall portion 146.

[0319] Furthermore, the peripheral wall portions 148 and 149 of the upper region of the differential housing 50 are arranged along the orbital path of the teeth 431a on the outer periphery of the planetary gear 431.

[0320] Therefore, in the region on the upper side of the fourth housing 14, the oil OL scraped by the planetary gear 431 can only move from the communication port 147 between the peripheral wall portions 148 and 149 to the outside of the space between the support wall portion 146 and the plate member 8 (second gear chamber Sb2).

[0321] Furthermore, as described above, the lowermost part 80c' of the plate member 8 is disposed between it and the bottom 143 of the fourth housing 14, separated by a gap CL. Therefore, in the lower part of the fourth housing 14, it is possible to move only from the gap CL to the outside of the space between the support wall 146 and the plate member 8 (the second gear chamber Sb2).

[0322] like Figure 27 As shown, when the vehicle equipped with the power transmission device 1 is moving forward, the stepped pinion 43 transmits the rotational driving force of the motor 2 through the power transmission path, and rotates around the axis X1 in the direction of the arrow CW in the figure, while simultaneously rotating (revolving) around the rotation axis X in the direction of the arrow CCW in the figure.

[0323] At this time, the oil OL scraped up by the revolving planetary gear 431 moves from the upstream side to the downstream side along the inner circumference of the peripheral wall 149 in the direction of the planetary gear 431's revolution (see the thick white arrow in the figure). Moreover, the oil OL moving along the inner circumference of the peripheral wall 149 eventually flows into the oil collection section 15 through the communication port 147.

[0324] In addition, the stepped pinion 43 rotates about the axis X1, so the large planetary gear 431 of the stepped pinion 43 causes the oil OL between the outer periphery and the peripheral wall portion 148 of the large planetary gear 431 to move toward the communication port 147 (see the thin white arrow in the figure).

[0325] As a result, the oil OL squeezed by the rotating planetary gear 431 moves along the inner circumference of the peripheral wall 148 to the communication port 147 and flows into the oil collection section 15. At this time, the oil OL that flies radially outward from the rotating planetary gear 431 flows directly into the oil collection section 15.

[0326] Therefore, by providing peripheral wall portions 148 and 149, oil OL that moves by the revolution force of the planetary gear 431 and oil OL that moves by the rotation force can flow from the communication port 147 into the oil collection portion 15.

[0327] This allows for an increase in the amount of oil OL supplied to the designated area within the fourth housing 14, namely the oil collection section 15.

[0328] Explain the function of the power transmission device 1 in the above structure.

[0329] like Figure 1As shown, in the power transmission device 1, a planetary reduction gear 4, a differential mechanism 5, and a drive shaft 9 (9A, 9B) are provided along the transmission path of the output rotation of the motor 2.

[0330] Furthermore, a parking gear 30 of a parking locking mechanism 3 is provided between the motor 2 and the planetary reduction gear 4 in the power transmission path.

[0331] like Figure 2 As shown, in this state, when the drive motor 2 and the rotor core 21 rotate around the rotation axis X, the rotation is input to the sun gear 41 of the planetary reduction gear 4 via the motor shaft 20 that rotates integrally with the rotor core 21.

[0332] like Figure 3 As shown, in the planetary reduction gear 4, the sun gear 41 becomes the input part for the output rotation of the motor 2. The differential housing 50 supporting the stepped pinion 43 becomes the output part for the input rotation.

[0333] When the sun gear 41 rotates about the rotation axis X by the input rotation, the step pinion 43 (large planetary gear 431, small planetary gear 432) rotates about the axis X1 by the rotation input from the side of the sun gear 41.

[0334] Here, the planetary gear 432 of the stepped pinion 43 meshes with the gear ring 42 fixed to the inner circumference of the fourth housing 14. Therefore, the stepped pinion 43 rotates on its own axis X1 and revolves around the rotation axis X.

[0335] Here, the outer diameter R2 of the small planetary gear 432 of the stepped pinion 43 is smaller than the outer diameter R1 of the large planetary gear 431 (see reference). Figure 3 ).

[0336] As a result, the differential housing 50 (first housing part 6, second housing part 7) supporting the stepped pinion 43 rotates around the rotation axis X at a speed lower than the rotation input from the motor 2 side.

[0337] Therefore, the rotation of the sun gear 41 input to the planetary reduction gear 4 is significantly reduced by the stepped pinion 43. The reduced rotation is output to the differential housing 50 (differential mechanism 5).

[0338] Furthermore, the differential housing 50 rotates about the rotation axis X upon input rotation, thereby causing the drive shafts 9 (9A, 9B) meshing with the pinion gear 52 within the differential housing 50 to rotate about the rotation axis X. Consequently, the left and right drive wheels W and W (refer to...) of the vehicle equipped with the power transmission device 1... Figure 1 It rotates by the transmitted rotational driving force.

[0339] like Figure 2As shown, lubricating oil OL is stored inside the fourth housing 14. Therefore, the stored oil OL is scraped up by the differential housing 50, which rotates around the rotation axis X, when the output rotation of the motor 2 is transmitted.

[0340] The oil OL scraped up lubricates the meshing parts of the sun gear 41 and the large planetary gear 431, the meshing parts of the small planetary gear 432 and the ring gear 42, and the meshing parts of the pinion gear 52 and the side gears 54A and 54B.

[0341] like Figure 19 As shown, viewed from the third housing 13 side, the differential housing 50 rotates in a counterclockwise direction CCW about the rotation axis X.

[0342] An oil collection section 15 is provided on the upper part of the fourth housing 14. The oil collection section 15 is located on the downstream side in the rotational direction of the differential housing 50. Most of the oil OL scraped up by the differential housing 50 flows into the oil collection section 15.

[0343] Here, in the fourth housing 14, there are peripheral wall portions 148 and 149 that surround the outer periphery of the large planetary gear 431 at intervals. Furthermore, a communication port 147 is provided between the peripheral wall portions 148 and 149 to connect the receiving portion 140 of the differential housing 50 with the oil collecting portion 15.

[0344] Therefore, oil OL, which moves due to the revolution force of the planetary gear 431 and oil OL, which moves due to its own rotation force, can flow from the communication port 147 into the oil collection section 15 (see reference). Figure 27 ).

[0345] This allows for an increase in the amount of oil OL supplied to the designated area within the fourth housing 14, namely the oil collection section 15.

[0346] like Figure 22 As shown, an oil guide 152, which is mounted on a support platform 151, is provided inside the oil collection section 15. The guide portion 154 and the oil blocking portion 153 of the oil guide 152 are located radially outside the first housing portion 6 of the differential housing 50 and radially outside the second housing portion 7 of the differential housing 50.

[0347] Therefore, most of the oil that is scraped up by the differential housing 50 and flows into the oil collection section 15 is captured by the oil guide 152.

[0348] A portion of the oil OL captured by the oil guide 152 is discharged from the cutout 155 provided in the wall portion 153a and flows into the oil hole 151a opened at one end on the upper surface of the support platform portion 151.

[0349] The end of the oil hole 151a on the inner diameter side is opened on the inner circumference of the support portion 145 (see reference). Figure 2Therefore, the oil OL flowing into the oil hole 151a is discharged into the gap Rx between the inner circumference of the support portion 145 of the fourth housing 14 and the cylinder wall portion 540 of the side gear 54B.

[0350] A portion of the oil OL discharged into the clearance Rx lubricates the bearing B2, which is supported by the support portion 145. The oil OL lubricating bearing B2 moves towards the outer diameter side due to the centrifugal force generated by the rotation of the differential housing 50. A slit 710 is provided along the inner circumference of the peripheral wall portion 73 on the outer diameter side of the differential housing 50. This prevents further movement of the oil OL towards the outer diameter side through the peripheral wall portion 73. The oil OL passes through the slit 710 towards the first housing portion 6.

[0351] On the first housing portion 6 side of the slit 710, an internal oil passage 781 is provided on the inner periphery of the guide portion 78. A portion of the oil OL that has passed through the slit 710 flows into the internal oil passage 781 by the centrifugal force generated by the rotation of the differential housing 50.

[0352] Oil OL flowing into the housing's internal oil passage 781 flows into the internal oil passage 440 of the pinion shaft 44 through the guide passage 441. Oil OL flowing into the internal oil passage 440 is discharged radially outward through oil holes 442 and 443. The discharged oil OL lubricates the needle roller bearing NB inserted into the pinion shaft 44.

[0353] In addition, such as Figure 14 As shown, a portion of the oil OL discharged into the gap Rx passes through an oil groove 721 provided on the inner circumference of the cylinder wall portion 72 of the second housing portion 7. The oil OL passing through the oil groove 721 is supplied to the washer 55 on the back of the support-side gear 54B and lubricates the washer 55.

[0354] Additionally, oil OL passing through the oil groove 712 provided in the base 71 of the second housing portion 7 and the oil groove 742 provided in the arc portion 741 is supplied to the spherical washer 53 on the back of the pinion gear 52 via the oil groove 712, thus lubricating the spherical washer 53.

[0355] Additionally, a portion of the oil OL captured by the oil guide 152 of the oil collection section 15 is discharged towards the guide section 154 (see reference). Figure 20 The front end 154b of the guide portion 154 is positioned opposite the oil hole 126a of the wall portion 120 of the second housing 12, separated by a gap in the X direction of the rotation axis (see reference). Figure 21 ).

[0356] Therefore, most of the oil OL discharged to the guide section 154 flows into the oil hole 126a of the second housing 12.

[0357] Furthermore, the oil OL that does not flow into the oil hole 126a moves along the wall 120 of the second housing 12 towards the lower part of the fourth housing 14.

[0358] like Figure 2 As shown, in the fourth housing 14, the space between the wall portion 120 and the plate member 8 forms a second gear chamber Sb2. The parking gear 30 of the parking locking mechanism 3 is located in the second gear chamber Sb2.

[0359] Therefore, when the oil OL that does not flow into the oil hole 126a moves downward in the second gear chamber Sb2, it lubricates the parking gear 30.

[0360] like Figure 21 As shown, a boss 126 surrounding the oil hole 126a is provided on the outer periphery of the wall portion 120. One end of the pipe 127 is inserted into the boss 126 from the rotation axis X direction.

[0361] Therefore, the oil OL flowing into the oil hole 126a of the second housing 12 flows into the piping 127.

[0362] Pipe 127 passes through the outside of the second housing 12 and reaches the third housing 13. The other end of pipe 127 connects to an oil hole 136a (see reference) in the cylindrical connecting wall 136 of the third housing 13. Figure 2 Connect.

[0363] Therefore, in this embodiment, a portion of the oil OL that reaches the oil collection section 15 is supplied to the internal space Sc of the connecting wall 136 via the guide section 154 and the pipe 127.

[0364] Oil OL, which drains from oil hole 136a into internal space Sc, is stored in internal space Sc. Oil OL lubricates bearing B4, which is supported by the peripheral wall portion 131 of third housing 13.

[0365] A portion of the oil OL discharged into the internal space Sc passes through the gap between the outer periphery of the drive shaft 9A and the inner periphery of the motor shaft 20, and moves to the other end 20b side of the motor shaft 20.

[0366] like Figure 10 As shown, the other end 20b of the motor shaft 20 is inserted into the inner side of the cylindrical wall portion 541 of the side gear 54A. A connecting passage 542 communicating with the back side of the side gear 54A is provided on the inner circumference of the cylindrical wall portion 541.

[0367] Therefore, a portion of the oil OL that has moved to the other end 20b of the motor shaft 20 and is discharged into the inner side of the cylinder wall 541 passes through the connecting passage 542. The oil OL that has passed through the connecting passage 542 is supplied to the washer 55 on the back of the side gear 54A to lubricate the washer 55.

[0368] Additionally, the oil OL that lubricates the back of the washer 55 of the side gear 54A is supplied to the spherical washer 53 on the back of the pinion gear 52 through the oil groove 662 provided in the gear support portion 66 of the first housing portion 6 and the oil groove 642 provided in the arc portion 641. The oil OL that passes through the oil groove 642 is supplied to the spherical washer 53 on the back of the pinion gear 52 to lubricate the spherical washer 53.

[0369] In addition, such as Figure 2 As shown, the internal space Sc of the third housing 13 is connected to the second gear chamber Sb2 of the fourth housing 14 via a radial oil passage 137, an axial oil passage 138, a connecting hole 112a, and an oil storage section 128 located at the bottom of the second housing 12.

[0370] Therefore, the oil OL in the internal space Sc is maintained at the same height as the oil OL stored in the fourth box 14.

[0371] As described above, the power transmission device 1 of this embodiment has the following structure.

[0372] (1) The power transmission device 1 has:

[0373] A stepped pinion 43 (pinion) having a large planetary gear 431 and a small planetary gear 432;

[0374] Differential housing 50, which functions as a planetary gear carrier to support stepped pinion 43;

[0375] Gear ring 42 meshes with asteroid gear 432;

[0376] The oil collection section 15 (oil supply section) is located above the horizontal line HL that passes through the center of revolution of the stepped pinion 43;

[0377] The peripheral wall portion 148 (downstream side wall portion) faces the gear face on the outer periphery of the tooth portion 431a of the planetary gear 431.

[0378] The peripheral wall portion 148 is configured to be adjacent to the oil collection portion 15 in the revolution direction of the stepped pinion 43, which is closer to the oil collection portion 15 than the oil collection portion 15 when viewed from the rotation axis X direction (axial direction).

[0379] In this configuration, the oil OL (lubricating oil) scraped up by the revolution of the stepped pinion 43 is introduced into the oil collection section 15.

[0380] In addition, after the planetary gear 431 passes through the area of ​​the communication port 147 with the oil collection section 15 in the downstream direction of the revolution, the oil OL scraped up by the rotation of the planetary gear 431 is guided to the oil collection section 15 along the inner circumferential surface 148c of the peripheral wall section 148.

[0381] Therefore, it is possible to increase the amount of oil OL introduced into the designated part, namely the oil collection part 15, within the fourth housing 14.

[0382] The power transmission device 1 of this embodiment has the following structure.

[0383] (2) A peripheral wall portion 149 (upstream side wall portion) having a gear face facing the outer periphery of the tooth portion 431a of the planetary gear 431.

[0384] The peripheral wall portion 149 is located above the horizontal line HL, which is above the center of revolution (rotation axis X) of the stepped pinion 43.

[0385] When viewed from the rotation axis X direction, the peripheral wall portion 149 is located upstream of the oil collection portion 15 in the revolution direction of the stepped pinion 43.

[0386] With this configuration, the oil OL scraped up by the revolution of the planetary gear 431 can be effectively guided into the oil collection section 15.

[0387] The power transmission device 1 of this embodiment has the following structure.

[0388] (3) A plate component 8 (plate) is positioned opposite the planetary gear 431 in the direction of rotation X.

[0389] Plate component 8 is fixed to peripheral wall portion 148 (downstream side wall portion).

[0390] In this way, by setting the structure of the plate component 8, the amount of oil OL introduced into the oil collection section 15 can be increased.

[0391] In addition, the plate member 8 can be fixed relative to the peripheral wall portion 148 by, for example, the boss portions 18, 18 provided on the peripheral wall portion 148, so that the plate member 8 can be provided close to the large planetary gear 431.

[0392] This allows for a further increase in the amount of oil OL introduced into the oil collection section 15.

[0393] The power transmission device 1 of this embodiment has the following structure.

[0394] (4) In the power transmission device 1, a motor 2 is arranged upstream of the sun gear 41 that meshes with the planetary gear 431 on the transmission path of the rotational driving force.

[0395] Drive shafts 9A and 9B are located downstream of the differential housing 50, which functions as a planetary gear carrier.

[0396] The drive shaft 9A passes through the inner circumference of the sun gear 41 and the motor shaft 20 of the motor 2 in the X direction of the rotation axis.

[0397] The power transmission device 1 is a power transmission device for a single-axle electric vehicle, which can provide a compact power transmission device.

[0398] In this embodiment, when viewed from the rotation axis X direction, the plate component 8 covers the entire planetary reduction gear 4 (planetary gear mechanism) and is also fixed to the peripheral wall portion 149 (upstream side wall portion), but it may also be partially disposed near the peripheral wall portion 148 (downstream side wall portion).

[0399] However, fixing it to the peripheral wall portion 149 (upstream side wall portion) can increase the amount of oil OL introduced into the oil collection portion 15 along the peripheral wall portion 149 (upstream side wall portion), so it is preferred.

[0400] The above describes the embodiments of the present invention, but the present invention is not limited to the embodiments shown. Appropriate modifications can be made within the scope of the inventive concept.

[0401] Explanation of reference numerals in the attached figures

[0402] 1. Power transmission device

[0403] 148 Peripheral wall portion (downstream sidewall portion)

[0404] 149 Peripheral wall (upstream sidewall)

[0405] 15. Oil Gathering Department (Oil Supply Department)

[0406] 2 motors

[0407] 41 Sun Gear

[0408] 42 Gear Ring

[0409] 43 Stepped pinion

[0410] 431 Planetary Gear

[0411] 431a Tooth section (gear face)

[0412] 432 Asteroid Gear

[0413] 50 Differential housing (planetary gear carrier)

[0414] 8. Plate components (plates)

[0415] 9 (9A, 9B) Drive shaft

[0416] HL horizontal line

[0417] X Rotation Axis

Claims

1. A power transmitting apparatus, comprising: a pinion gear having a large planetary gear and a small planetary gear; a planetary carrier supporting the pinion gear; a ring gear meshing with the small planetary gear; an oil supply portion located at a position higher than a horizontal line passing through a revolution center of the pinion gear; a downstream side wall portion opposing a gear face of the large planetary gear, the downstream side wall portion being configured to be adjacent to the oil supply portion in a downstream direction of revolution of the pinion gear than the oil supply portion when viewed in an axial direction.

2. The power transmitting apparatus according to claim 1, wherein an upstream side wall portion opposing the gear face of the large planetary gear is provided, the upstream side wall portion is located at a position higher than the horizontal line passing through the revolution center of the pinion gear, the upstream side wall portion is located at a position upstream of the oil supply portion in the revolution direction of the pinion gear than the oil supply portion when viewed in the axial direction.

3. The power transmitting apparatus according to claim 1 or 2, wherein a plate opposing the large planetary gear in the axial direction is provided, the plate is fixed to the downstream side wall portion.

4. The power transmission apparatus according to claim 1 or 2, wherein having: a motor configured upstream of a sun gear meshing with the large planetary gear; a drive shaft configured downstream of the planetary carrier, the drive shaft penetrating an inner periphery of the sun gear and the motor.

5. The power transmission device according to claim 3, wherein having: a motor configured upstream of a sun gear meshing with the large planetary gear; a drive shaft configured downstream of the planetary carrier, the drive shaft penetrating an inner periphery of the sun gear and the motor.

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