WO2021137291A1 - Power transmission device - Google Patents

Abstract

[Problem] To prevent interference between a parking lock mechanism and vehicle parts. [Solution] A power transmission device includes, in a box, a differential mechanism that overlaps with a motor in an axial direction; a casing that houses the differential mechanism; a pinion gear supported in the case; and a ring gear that engages with the pinion gear. The box includes an engaging part that engages with the ring gear at an outer periphery of the ring gear, and a manual shaft of the parking lock mechanism is inserted in and supported by a built-up portion that protrudes in the axial direction from the engaging part toward the motor.

Description

Power transmission device

The present invention relates to a power transmission device.

Patent Document 1 discloses a power transmission device for an electric vehicle having a bevel gear type differential mechanism and a planetary gear mechanism.
This planetary gear mechanism comprises a stepped pinion gear having a large pinion gear and a small pinion gear.

Japanese Unexamined Patent Publication No. 8-240254

When mounting the power transmission device on a vehicle, it is required to prevent interference between the park lock mechanism and vehicle parts.

The power transmission device in a certain aspect of the present invention is
A differential mechanism that overlaps the motor in the axial direction,
A case accommodating the differential mechanism and
The pinion gear supported by the case and
A ring gear that meshes with the pinion gear is provided in the box.
The box has an engaging portion that engages with the ring gear on the outer circumference of the ring gear.
A manual shaft of a park lock mechanism is inserted and supported in a built-up portion that protrudes from the engaging portion toward the motor in the axial direction.

According to an aspect of the present invention, it is possible to prevent interference between the park lock mechanism and vehicle parts.

It is a skeleton diagram of a power transmission device. It is a schematic diagram of the cross section of a power transmission device. It is an enlarged view around the planetary reduction gear of a power transmission device. It is an enlarged view around the differential mechanism of a power transmission device. It is a perspective view of the differential mechanism of a power transmission device. It is an exploded perspective view of the differential mechanism of a power transmission device. It is a figure explaining the oil catch part. It is a figure explaining the oil catch part. It is a figure explaining the oil catch part. It is a figure explaining the oil catch part. It is a figure explaining the oil catch part. It is a figure explaining the oil catch part. It is a figure explaining the plate member. It is a figure explaining the plate member. It is the figure which looked at the 4th box from the motor side. It is the figure which looked at the 4th box from the motor side. It is a figure explaining the park lock mechanism. It is a figure explaining the park lock mechanism. It is a figure explaining the park lock mechanism. It is a figure explaining the park lock mechanism. It is a figure explaining the park lock mechanism. It is a figure explaining the overlay part. It is a figure explaining the overlay part.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a skeleton diagram illustrating a power transmission device 1 according to the present embodiment.
FIG. 2 is a schematic cross-sectional view illustrating the power transmission device 1 according to the present embodiment.
FIG. 3 is an enlarged view around the planetary reduction gear 4 of the power transmission device 1.
FIG. 4 is an enlarged view of the power transmission device 1 around the differential mechanism 5.

As shown in FIG. 1, the power transmission device 1 includes a motor 2 and a planetary reduction gear 4 (reduction mechanism) that decelerates the output rotation of the motor 2 and inputs it to the differential mechanism 5. The power transmission device 1 also has a drive shaft 9 (9A, 9B) as a drive shaft and a park lock mechanism 3.
In the power transmission device 1, a park lock mechanism 3, 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. There is.

In the power transmission device 1, after the output rotation of the motor 2 is decelerated by the planetary reduction gear 4 and input to the differential mechanism 5, the power transmission device 1 is mounted via the drive shafts 9 (9A, 9B). It is transmitted to the left and right drive wheels W and W of the vehicle.
Here, the planetary reduction gear 4 is connected to the downstream side of the motor 2. The differential mechanism 5 is connected downstream of the planetary reduction gear 4. The drive shafts 9 (9A, 9B) are connected downstream of the differential mechanism 5.

As shown in FIG. 2, the main body box 10 of the power transmission device 1 has a first box 11 that houses the motor 2 and a second box 12 that is externally inserted into the first box 11. The main body box 10 has a third box 13 assembled to the first box 11 and a fourth box 14 assembled to the second box 12.

The first box 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.
The first box 11 is provided with the support wall portion 111 oriented along the rotation axis X of the motor 2. The motor 2 is housed inside the support wall portion 111.

The joint portion 112 is provided in a direction 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.

The second box 12 includes 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. ,have.
The peripheral wall portion 121 is formed with an inner diameter that can be extrapolated to the support wall portion 111 of the first box 11.
The first box 11 and the second box 12 are assembled to each other by externally inserting the peripheral wall portion 121 of the second box 12 into the support wall portion 111 of the first box 11.

The joint portion 122 on the one end 121a side of the peripheral wall portion 121 is in contact with the joint portion 112 of the first box 11 from the rotation axis X direction. These joints 122 and 112 are connected to each other by bolts (not shown).
In the first box 11, a plurality of concave grooves 111b are provided on the outer periphery of the support wall portion 111. The plurality of concave grooves 111b are provided at intervals in the rotation axis X direction. Each of the concave grooves 111b is provided over the entire circumference in the circumferential direction around the rotation axis X.
The peripheral wall portion 121 of the second box 12 is externally inserted into the support wall portion 111 of the first box 11. The opening of the concave groove 111b is closed by the peripheral wall portion 121. A plurality of cooling passages CP through which cooling water flows are formed between the support wall portion 111 and the peripheral wall portion 121.

On the outer periphery of the support wall portion 111 of the first box 11, ring grooves 111c and 111c are formed on both sides of the region where the concave groove 111b is provided. Seal rings 113 and 113 are fitted and attached to the ring grooves 111c and 111c.
These seal rings 113 are pressed against the inner circumference of the peripheral wall portion 121 extrapolated to the support wall portion 111 to seal the gap between the outer circumference of the support wall portion 111 and the inner circumference of the peripheral wall portion 121.

The other end 121b of the second box 12 is provided with a wall portion 120 extending toward the inner diameter side. The wall portion 120 is provided in a direction orthogonal to the rotation axis X. An opening 120a through which the drive shaft 9A is inserted is provided in a region of the wall portion 120 that intersects with the rotation axis X.
In the wall portion 120, a tubular motor support portion 125 surrounding the opening 120a is provided on the surface on the motor 2 side (right side in the drawing).
The motor support portion 125 is inserted inside the coil end 253b described later. The motor support portion 125 faces the end portion 21b of the rotor core 21 with a gap in the rotation axis X direction.

The peripheral wall portion 121 of the second box 12 has a thicker radial thickness in the lower region than in the upper region in the vertical direction with respect to the mounted state of the power transmission device 1 in the vehicle.
An oil reservoir 128 is provided so as to penetrate in the rotation axis X direction in the thick region in the radial direction.
The oil reservoir 128 communicates with the axial oil passage 138 provided at the joint 132 of the third box 13 via the communication hole 112a. The communication hole 112a is provided in the joint portion 112 of the first box 11.

The third box 13 has a wall portion 130 orthogonal to the rotation axis X. A ring-shaped joint 132 is provided on the outer periphery of the wall 130 when viewed from the rotation axis X direction.
The third box 13 is located on the opposite side (right side in the drawing) of the differential mechanism 5 when viewed from the first box 11. The joint portion 132 of the third box 13 is joined to the joint portion 112 of the first box 11 from the rotation axis X direction. The third box 13 and the first box 11 are connected to each other by bolts (not shown). In this state, in the first box 11, the opening of the support wall portion 111 on the joint portion 122 side (right side in the drawing) is closed by the third box 13.

In the third box 13, an insertion hole 130a for the drive shaft 9A is provided in the central portion of the wall portion 130.
A lip seal RS is provided on the inner circumference of the insertion hole 130a. In the lip seal RS, a lip portion (not shown) is elastically brought into contact with the outer circumference of the drive shaft 9A. The gap between the inner circumference of the insertion hole 130a and the outer circumference of the drive shaft 9A is sealed by the lip seal RS.
A peripheral wall portion 131 surrounding the insertion hole 130a is provided on the surface of the wall portion 130 on the side of the first box 11 (left side in the drawing). A drive shaft 9A is supported on the inner circumference of the peripheral wall portion 131 via a bearing B4.

A motor support portion 135 is provided on the motor 2 side (left side in the drawing) when viewed from the peripheral wall portion 131. The motor support portion 135 has a tubular shape that surrounds the outer circumference of the rotating shaft X at intervals.
A cylindrical connecting wall 136 is connected to the outer circumference 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 wall portion 130 side (right side in the drawing). The connection wall 136 is provided in a direction along the rotation axis X, and extends in a direction away from the motor 2. The connection wall 136 connects the motor support portion 135 and the wall portion 130 of the third box 13.

The motor support portion 135 is supported by the third box 13 via the connecting wall 136. One end 20a side of the motor shaft 20 penetrates the inside of the motor support portion 135 from the motor 2 side to the peripheral wall portion 131 side.
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.
A lip seal RS is provided at a position adjacent to the bearing B1.

In the third box 13, an oil hole 136a, which will be described later, is opened on the inner circumference of the connecting wall 136. The oil OL flows into the space (internal space Sc) surrounded by the connecting wall 136 from the oil hole 136a. The lip seal RS is provided to prevent the oil OL in the connecting wall 136 from flowing into the motor 2 side.

The fourth box 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 portion of the peripheral wall portion 141 on the second box 12 side. doing.
The fourth box 14 is located on the differential mechanism 5 side (left side in the drawing) when viewed from the second box 12. The joint portion 142 of the fourth box 14 is joined to the joint portion 123 of the second box 12 from the rotation axis X direction. The fourth box 14 and the second box 12 are connected to each other by bolts (not shown).

Inside the main body box 10 of the power transmission device 1, a motor chamber Sa accommodating the motor 2 and a gear chamber Sb accommodating the planetary reduction gear 4 and the differential mechanism 5 are formed.
The motor chamber Sa is formed inside the first box 11 between the wall portion 120 of the second box 12 and the wall portion 130 of the third box 13.
The gear chamber Sb is formed on the inner diameter side of the fourth box 14 between the wall portion 120 of the second box 12 and the peripheral wall portion 141 of the fourth box 14.

A plate member 8 is provided inside the gear chamber Sb.
The plate member 8 is fixed to the fourth box 14 with bolts B.
The plate member 8 divides the gear chamber Sb into a first gear chamber Sb1 accommodating the planetary reduction gear 4 and the differential mechanism 5 and a second gear chamber Sb2 accommodating the park lock mechanism 3.
The second gear chamber Sb2 is located between the first gear chamber Sb1 and the motor chamber Sa in the X direction of the rotation axis.

The motor 2 has a cylindrical motor shaft 20, a cylindrical rotor core 21 extrapolated to the motor shaft 20, and a stator core 25 that surrounds the outer circumference of the rotor core 21 at intervals.

In the motor shaft 20, bearings B1 and B1 are extrapolated and fixed on both sides of the rotor core 21.
The bearing B1 located on one end 20a side (right side in the drawing) of the motor shaft 20 as viewed from the rotor core 21 is supported on the inner circumference of the motor support portion 135 of the third box 13. The bearing B1 located on the other end 20b side is supported on the inner circumference of the cylindrical motor support portion 125 of the second box 12.

The motor support portions 135 and 125 are arranged on the inner diameter side of the coil ends 253a and 253b, which will be described later, with one end 21a and the other end 21b of the rotor core 21 facing each other with a gap in the rotation axis X direction. ing.

The rotor core 21 is formed by laminating a plurality of silicon steel plates. Each of the silicon steel plates is extrapolated to the motor shaft 20 in a state where the relative rotation with the motor shaft 20 is restricted.
The silicon steel plate has a ring shape when viewed from the rotation axis X direction of the motor shaft 20. On the outer peripheral side of the silicon steel plate, magnets of N pole and S pole (not shown) are alternately provided in the circumferential direction around the rotation axis X.

The stator core 25 that surrounds the outer circumference of the rotor core 21 is formed by laminating a plurality of electromagnetic steel sheets. The stator core 25 is fixed to the inner circumference of the cylindrical support wall portion 111 of the first box 11.
Each of the electrical steel sheets has a ring-shaped yoke portion 251 fixed to the inner circumference of the support wall portion 111, and a teeth portion 252 protruding from the inner circumference of the yoke portion 251 toward the rotor core 21.

In the present embodiment, the stator core 25 having a configuration in which the winding 253 is distributed and wound across a plurality of teeth portions 252 is adopted. The stator core 25 is longer in the rotation axis X direction than the rotor core 21 by the amount of the coil ends 253a and 253b protruding in the rotation axis X direction.

Note that a stator core having a configuration in which windings are centrally wound may be adopted for each of the plurality of tooth portions 252 protruding toward the rotor core 21 side.

The wall portion 120 (motor support portion 125) of the second box 12 is provided with an opening 120a. The other end 20b side of the motor shaft 20 penetrates the opening 120a to the differential mechanism 5 side (left side in the drawing) and is located in the fourth box 14.
The other end 20b of the motor shaft 20 faces the side gear 54A, which will be described later, with a gap in the rotation axis X direction inside the fourth box 14.

As shown in FIG. 3, in the motor shaft 20, a step portion 201 is provided in a region located in the fourth box 14. The step portion 201 is located in the vicinity of the motor support portion 125. A lip seal RS supported on the inner circumference of the motor support portion 125 is in contact with the outer periphery of the region between the step portion 201 and the bearing B1.
The lip seal RS separates the motor chamber Sa accommodating the motor 2 and the gear chamber Sb in the fourth box 14.

An oil OL for lubricating the planetary reduction gear 4 and the differential mechanism 5 is sealed in the inner diameter side of the fourth box 14 (see FIG. 2).
The lip seal RS is provided to prevent the inflow of oil OL into the motor chamber Sa.

As shown in FIG. 3, in the motor shaft 20, the region from the step portion 201 to the vicinity of the other end 20b is a fitting portion 202 provided with a spline on the outer periphery.
A park gear 30 and a sun gear 41 are spline-fitted on the outer circumference of the fitting portion 202.

In the park gear 30, one side surface of the park gear 30 in the X direction of the rotation axis is in contact with the step portion 201 (right side in the drawing). One end 410a of the cylindrical base 410 of the sun gear 41 is in contact with the other side surface of the park gear 30 (left side in the figure).
A nut N screwed into the other end 20b of the motor shaft 20 is in pressure contact with the other end 410b of the base portion 410 from the rotation axis X direction.
The sun gear 41 and the park gear 30 are provided so as not to rotate relative to the motor shaft 20 in a state of being sandwiched between the nut N and the step portion 201.

The sun gear 41 has a tooth portion 411 on the outer periphery of the motor shaft 20 on the other end 20b side. A large-diameter gear portion 431 of the stepped pinion gear 43 meshes with the outer periphery of the tooth portion 411.

The stepped pinion gear 43 has a large-diameter gear portion 431 that meshes with the sun gear 41 and a small-diameter gear portion 432 having a diameter smaller than that of the large-diameter gear portion 431.
The stepped pinion gear 43 is a gear component in which a large-diameter gear portion 431 and a small-diameter gear portion 432 are integrally provided side by side in the direction of the axis X1 parallel to the rotation axis X.
The large-diameter gear portion 431 is formed with an outer diameter R1 larger than the outer diameter R2 of the small-diameter gear portion 432.
The stepped pinion gear 43 is provided in a direction along the axis X1. In this state, the large-diameter gear portion 431 is positioned on the motor 2 side (right side in the figure).

The outer circumference of the small diameter gear portion 432 meshes with the inner circumference of the ring gear 42. The ring gear 42 has a ring shape that surrounds the rotation shaft X at intervals. A plurality of engaging teeth 421 protruding outward in the radial direction are provided on the outer periphery of the ring gear 42. The plurality of engaging teeth 421 are provided at intervals in the circumferential direction around the rotation axis X.
In the ring gear 42, the engaging teeth 421 provided on the outer circumference are spline-fitted to the tooth portions 146a provided on the support wall portion 146 of the fourth box 14. The ring gear 42 is restricted from rotating around the rotation axis X. That is, the support wall portion 146 of the fourth box 14 functions as an engaging portion that engages with the ring gear 42.

The stepped pinion gear 43 has a through hole 430 that penetrates the inner diameter side of the large-diameter gear portion 431 and the small-diameter gear portion 432 in the axis X1 direction.
The stepped pinion gear 43 is rotatably supported on the outer circumference of the pinion shaft 44 penetrating the through hole 430 via needle bearings NB and NB.

On the outer circumference of the pinion shaft 44, an intermediate spacer MS is interposed between the needle bearing NB that supports the inner circumference of the large-diameter gear portion 431 and the needle bearing NB that supports the inner circumference of the small-diameter gear portion 432. ..

As shown in FIG. 4, an in-shaft oil passage 440 is provided inside the pinion shaft 44. The in-shaft oil passage 440 penetrates from one end 44a of the pinion shaft 44 to the other end 44b along the axis X1.
The pinion shaft 44 is provided with oil holes 442 and 443 that communicate the in-shaft oil passage 440 and the outer circumference of the pinion shaft 44.

The oil hole 443 opens in the region where the needle bearing NB that supports the inner circumference of the large-diameter gear portion 431 is provided.
The oil hole 442 is open in the region where the needle bearing NB that supports the inner circumference of the small diameter gear portion 432 is provided.
In the pinion shaft 44, the oil holes 443 and 442 are opened in the region where the stepped pinion gear 43 is extrapolated.

Further, the pinion shaft 44 is provided with an introduction path 441 for introducing the oil OL into the in-shaft oil passage 440.
On the outer circumference of the pinion shaft 44, the introduction path 441 is open to a region located in the support hole 71a of the second case portion 7, which will be described later. The introduction path 441 communicates the in-shaft oil passage 440 with the outer circumference of the pinion shaft 44.

An oil passage 781 in the case is opened on the inner circumference of the support hole 71a. The oil passage 781 in the case communicates the outer circumference of the guide portion 78 protruding from the base portion 71 of the second case portion 7 with the support hole 71a.
In a cross-sectional view along the axis X1, the oil passage 781 in the case is inclined with respect to the axis X1. The oil passage 781 in the case is inclined toward the rotation axis X side toward the slit 710 provided in the base 71.

The oil OL scraped up by the differential case 50, which will be described later, flows into the oil passage 781 in the case. The oil OL that moves to the outer diameter side flows into the oil passage 781 inside the case due to the centrifugal force generated by the rotation of the differential case 50.
The oil OL that has flowed from the oil passage 781 in the case into the introduction passage 441 flows into the in-shaft oil passage 440 of the pinion shaft 44. The oil OL that has flowed into the in-shaft 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 bearing NB extrapolated to the pinion shaft 44.

In the pinion shaft 44, a through hole 444 is provided on the other end 44b side of the region where the introduction path 441 is provided. The through hole 444 penetrates the pinion shaft 44 in the diameter line direction.
The pinion shaft 44 is provided so that the through hole 444 and the insertion hole 782 on the second case portion 7 side, which will be described later, are in phase with each other around the axis X1. The positioning pin P inserted into the insertion hole 782 penetrates the through hole 444 of the pinion shaft 44. As a result, the pinion shaft 44 is supported on the second case portion 7 side in a state where rotation around the axis X1 is restricted.

As shown in FIG. 4, on the one end 44a side of the pinion shaft 44 in the longitudinal direction, the region protruding from the stepped pinion gear 43 is the first shaft portion 445. The first shaft portion 445 is supported by a support hole 61a provided in the first case portion 6 of the differential case 50.
On the other end 44b side of the pinion shaft 44 in the longitudinal direction, a region protruding from the stepped pinion gear 43 is the second shaft portion 446. The second shaft portion 446 is supported by a support hole 71a provided in the second case portion 7 of the differential case 50.

Here, the first shaft portion 445 means a region on the pinion shaft 44 on the one end 44a side where the stepped pinion gear 43 is not extrapolated. The second shaft portion 446 means a region on the other end 44b side of the pinion shaft 44 where the stepped pinion gear 43 is not extrapolated.
In the pinion shaft 44, the length of the second shaft portion 446 in the axis X1 direction is longer than that of the first shaft portion 445.

Hereinafter, the main configuration of the differential mechanism 5 will be described.
FIG. 5 is a perspective view of the differential mechanism 5 around the differential case 50.
FIG. 6 is an exploded perspective view of the differential mechanism 5 around the differential case 50.
As shown in FIGS. 4 to 6, the differential case 50 as a case accommodates the differential mechanism 5. The differential case 50 is formed by assembling the first case portion 6 and the second case portion 7 in the rotation axis X direction. In the differential case 50 of the present embodiment, the first case portion 6 and the second case portion 7 have a function as a carrier for supporting the pinion shaft 44 of the planetary reduction gear 4.

As shown in FIG. 6, three pinion mate gears 52 and three pinion mate shafts 51 are provided between the first case portion 6 and the second case portion 7 of the differential case 50. The pinion mate shafts 51 are provided at equal intervals in the circumferential direction around the rotation axis X (see FIG. 6).
The inner diameter side ends of each of the pinion mate shafts 51 are connected to a common connecting portion 510.

One pinion mate gear 52 is extrapolated to each of the pinion mate shaft 51. Each of the pinion mate gears 52 is in contact with the connecting portion 510 from the radial outside of the rotating shaft X.
In this state, each of the pinion mate gears 52 is rotatably supported by the pinion mate shaft 51.

As shown in FIG. 4, a spherical washer 53 is extrapolated to the pinion mate shaft 51. The spherical washer 53 is in contact with the spherical outer circumference of the pinion mate gear 52.

In the differential case 50, the side gear 54A is located on one side of the connecting portion 510 in the rotation axis X direction, and the side gear 54B is located on the other side. The side gear 54A is rotatably supported by the first case portion 6. The side gear 54B is rotatably supported by the second case portion 7.
The side gear 54A meshes with three pinion mate gears 52 from one side in the rotation axis X direction. The side gear 54B meshes with the three pinion mate gears 52 from the other side in the rotation axis X direction.

As shown in FIG. 6, the first case portion 6 has a ring-shaped base portion 61. The base portion 61 is a plate-shaped member having a thickness W61 in the rotation axis X direction.
As shown in FIG. 4, an opening 60 is provided in the central portion of the base portion 61. A tubular wall portion 611 surrounding the opening 60 is provided on the surface of the base portion 61 opposite to the second case portion 7 (on the right side in the drawing). The outer circumference of the cylinder wall portion 611 is supported by the plate member 8 via the bearing B3.

As shown in FIG. 6, three connecting beams 62 extending toward the second case portion 7 are provided on the surface of the base portion 61 on the second case portion 7 side.
The connecting beams 62 are provided at equal intervals in the circumferential direction around the rotation axis X. The connecting beam 62 has a base portion 63 orthogonal to the base portion 61 and a connecting portion 64 wider than the base portion 63.

As shown in FIG. 4, a support groove 65 for supporting the pinion mate shaft 51 is provided on the tip surface of the connecting portion 64.
An arc portion 641 is formed on the inner diameter side (rotation shaft X side) of the connecting portion 64 in a shape along the outer circumference of the pinion mate gear 52.
In the arc portion 641, the outer circumference of the pinion mate gear 52 is supported via the spherical washer 53.

In the connecting beam 62, the gear support portion 66 is connected to the boundary portion between the base portion 63 and the connecting portion 64. The gear support portion 66 is provided in a direction orthogonal to the rotation axis X. The gear support portion 66 has a through hole 660 in the central portion.

The gear support portion 66 is provided with a recess 661 that surrounds the through hole 660 on the surface opposite to the base portion 61 (on the left side in the drawing). A ring-shaped washer 55 that supports the back surface of the side gear 54A is housed in the recess 661.
A cylindrical wall portion 541 is provided on the back surface of the side gear 54A. The washer 55 is extrapolated to the cylinder wall portion 541.

As shown in FIG. 6, the support hole 61a of the pinion shaft 44 is opened in the base portion 61. The support holes 61a are open in the region between the connecting beams 62, 62 arranged at intervals in the circumferential direction around the rotation axis X.
As shown in FIG. 3, the base portion 61 is provided with a boss portion 616 that surrounds the support hole 61a. The washer Wc extrapolated to the pinion shaft 44 comes into contact with the boss portion 616 from the rotation axis X direction.

As shown in FIG. 6, in the base portion 61, an oil groove 617 is provided in the range from the central opening 60 to the boss portion 616. The oil groove 617 is formed in a tapered shape in which the width in the circumferential direction around the rotation axis X becomes narrower as it approaches the boss portion 616. The oil groove 617 is in contact with the oil groove 618 provided in the boss portion 616.

In the connecting portion 64, bolt holes 67 and 67 are provided on both sides of the support groove 65.
A connecting portion 74 on the side of the second case portion 7 is joined to the connecting portion 64 of the first case portion 6 from the rotation axis X direction. In the first case portion 6 and the second case portion 7, bolts B penetrating the connecting portion on the second case portion 7 side are screwed into the bolt holes 67 and 67 and joined to each other.

As shown in FIG. 6, the second case portion 7 has a ring-shaped base portion 71.
As shown in FIG. 4, the base portion 71 is a plate-shaped member having a thickness W71 in the rotation axis X direction.
A through hole 70 that penetrates the base portion 71 in the thickness direction is provided in the central portion of the base portion 71.
On the surface of the base portion 71 opposite to the first case portion 6 (on the left side in the drawing), a tubular wall portion 72 surrounding the through hole 70 and a peripheral wall portion 73 surrounding the tubular wall portion 72 at intervals are provided. ing.
At the tip of the peripheral wall portion 73, a protrusion 73a protruding toward the rotation axis X side is provided. The protrusion 73a is provided over the entire circumference in the circumferential direction around the rotation axis X.

Three support holes 71a of the pinion shaft 44 are opened on the outer diameter side of the peripheral wall portion 73. The support holes 71a are provided at intervals in the circumferential direction around the rotation axis X.
On the inner diameter side of the peripheral wall portion 73, three slits 710 that penetrate the base portion 71 in the thickness direction are provided.
When viewed from the rotation axis X direction, the slit 710 has an arc shape along the inner circumference of the peripheral wall portion 73. The slit 710 is formed in a predetermined angle range in the circumferential direction around the rotation axis X.

As shown in FIG. 6, in the second case portion 7, the slits 710 are provided at intervals in the circumferential direction around the rotation axis X. Each of the slits 710 is provided across the inner diameter side of the support hole 71a in the circumferential direction around the rotation axis X.

Three protruding walls 711 protruding toward the front side of the paper surface are provided between the slits 710 and 710 adjacent to each other in the circumferential direction around the rotation axis X. The protruding wall 711 extends linearly in the radial direction of the rotation axis X. The protruding wall 711 is provided so as to straddle the peripheral wall portion 73 on the outer diameter side and the tubular wall portion 72 on the inner diameter side.

The three protruding walls 711 are provided at intervals in the circumferential direction around the rotation axis X. The protruding wall 711 is provided with the slit 710 having a phase shift of about 45 degrees in the circumferential direction around the rotation axis X.

On the outer diameter side of the peripheral wall portion 73, bolt accommodating portions 76, 76 recessed on the inner side of the paper surface are provided between the support holes 71a, 71a adjacent to each other in the circumferential direction around the rotation axis X.
A bolt insertion hole 77 is opened inside the bolt accommodating portion 76. The insertion hole 77 penetrates the base 71 in the thickness direction (rotation axis X direction).

On the surface of the base portion 71 on the first case portion 6 side (right side in the drawing), three connecting portions 74 projecting to the first case portion 6 side are provided.
The number of connecting portions 74 is provided in the same number as the number of connecting beams 62 on the side of the first case portion 6.

As shown in FIG. 4, a support groove 75 for supporting the pinion mate shaft 51 is provided on the tip surface of the connecting portion 74.

An arc portion 741 along the outer circumference of the pinion mate gear 52 is provided on the inner diameter side (rotation shaft X side) of the connecting portion 74.
In the arc portion 741, the outer circumference of the pinion mate gear 52 is supported via the spherical washer 53.
In the second case portion 7, a ring-shaped washer 55 that supports the back surface of the side gear 54B is placed on the surface 71b of the base portion 71. A cylindrical wall portion 540 is provided on the back surface of the side gear 54B. The washer 55 is extrapolated to the cylinder wall portion 540.

A guide portion 78 is provided on the base portion 71 of the second case portion 7 so as to project toward the first case portion 6 side (right side in the drawing). The same number of guide portions 78 as the boss portions 616 of the first case portion 6 are provided.

As shown in FIG. 4, in the cross-sectional view along the axis X1, the pinion shaft 44 is inserted into the support hole 71a of the guide portion 78 from the side of the first case portion 6. The pinion shaft 44 is positioned in a state where rotation around the axis X1 is restricted by the positioning pin P.
In this state, the small-diameter gear portion 432 of the stepped pinion gear 43 extrapolated to the pinion shaft 44 is in contact with the guide portion 78 from the axis X1 direction with the washer Wc sandwiched between them.

In the differential case 50, the bearing B2 is extrapolated to the cylinder wall portion 72 of the second case portion 7. The bearing B2 extrapolated to the cylinder wall portion 72 is held by the support portion 145 of the fourth box 14. The tubular wall portion 72 of the differential case 50 is rotatably supported by the fourth box 14 via the bearing B2.

A drive shaft 9B penetrating the opening 145a of the fourth box 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.
A lip seal RS is fixed to the inner circumference of the opening 145a. A lip portion (not shown) of the lip seal RS is elastically in contact with the outer circumference of the cylinder wall portion 540 of the side gear 54B extrapolated to the drive shaft 9B.
As a result, the gap between the outer circumference of the cylinder wall portion 540 of the side gear 54B and the inner circumference of the opening 145a is sealed.

The first case portion 6 of the differential case 50 is supported by the plate member 8 via a bearing B3 extrapolated to the cylinder wall portion 611.
As shown in FIG. 2, a drive shaft 9A penetrating the insertion hole 130a of the third box 13 is inserted into the inside of the first case portion 6 from the direction of the rotation axis.
The drive shaft 9A is provided across the motor shaft 20 of the motor 2 and the inner diameter side of the sun gear 41 of the planetary reduction gear 4 in the rotation axis X direction.

As shown in FIG. 4, inside the differential case 50, side gears 54A and 54B are spline-fitted on the outer periphery of the tip of the drive shaft 9 (9A, 9B). The side gears 54A and 54B and the drive shafts 9 (9A and 9B) are integrally rotatably connected around the rotation shaft X.

In this state, the side gears 54A and 54B are arranged to face each other at intervals in the rotation axis X direction, and the connecting portion 510 of the pinion mate shaft 51 is located between the side gears 54A and 54B.
In this embodiment, a total of three pinion mate shafts 51 extend radially outward from the connecting portion 510. A pinion mate gear 52 is supported on each of the pinion mate shafts 51. The pinion mate gear 52 is assembled to the side gear 54A located on one side in the rotation axis X direction and the side gear 54B located on the other side in a state where the teeth are meshed with each other.

As shown in FIG. 2, the lubricating oil OL is stored inside the fourth box 14. The lower side of the differential case 50 is located in the stored oil OL.
In the present embodiment, when the connecting beam 62 is located at the lowermost position, the oil OL is stored up to the height at which the connecting beam 62 is located in the oil OL.
The stored oil OL is scraped up by the differential case 50 that rotates around the rotation axis X when the output rotation of the motor 2 is transmitted.

7 to 12 are views for explaining the oil catch portion 15.
FIG. 7 is a plan view of the fourth box 14 as viewed from the third box 13 side.
FIG. 8 is a perspective view of the oil catch portion 15 shown in FIG. 7 as viewed from diagonally above.
FIG. 9 is a plan view of the fourth box 14 as viewed from the third box 13 side. FIG. 9 shows a state in which the differential case 50 is arranged.
FIG. 10 is a perspective view of the oil catch portion 15 shown in FIG. 9 as viewed from diagonally above.
FIG. 11 is a schematic view of a cross section taken along the line AA in FIG.
FIG. 12 is a schematic view illustrating the positional relationship between the oil catch portion 15 and the differential case 50 (first case portion 6, second case portion 7) when the power transmission device 1 is viewed from above.
In addition, in FIG. 7 and FIG. 9, hatching is added in order to clarify the positions of the joint portion 142 of the fourth box 14 and the support wall portion 146. In FIG. 12, the position of the manual plate 35 is shown by a virtual line.

As shown in FIG. 7, the fourth box 14 when viewed from the rotation axis X direction is provided with a support wall portion 146 that surrounds the central opening 145a at intervals. The inside of the support wall portion 146 (rotation axis X) is the accommodating portion 140 of the differential case 50 (see FIG. 9).
A space for the oil catch portion 15 and a space for the breather chamber 16 are formed in the upper part of the fourth box 14.

In the support wall portion 146 of the fourth box 14, a communication port 147 for communicating the oil catch portion 15 and the accommodating portion 140 of the differential case 50 is provided in the region intersecting the vertical line VL.

As shown in FIG. 7, the oil catch portion 15 and the breather chamber 16 are located on one side (left side in the figure) and the other side (right side in the figure) with a vertical line VL orthogonal to the rotation axis X, respectively. doing.
The oil catch portion 15 is arranged at a position offset from the vertical line VL passing through the rotation center (rotation axis X) of the differential case 50. As shown in FIG. 12, when the oil catch portion 15 is viewed from above, the oil catch portion 15 is arranged at a position offset from directly above the differential case 50.
Here, the vertical line VL is a vertical line VL based on the installation state of the power transmission device 1 in the vehicle. The vertical line VL when viewed from the rotation axis X direction is orthogonal to the rotation axis X.
In the following description, the horizon HL is a horizon HL based on the installation state of the power transmission device 1 in the vehicle. The horizontal line HL when viewed from the rotation axis X direction is orthogonal to the rotation axis X.

As shown in FIG. 8, the oil catch portion 15 is formed so as to extend to the back side of the paper surface from the support wall portion 146. A support base portion 151 is provided on the lower edge of the oil catch portion 15 so as to project toward the front side of the paper surface. The support base portion 151 functions as a shelf portion for forming a space for the oil catch portion 15 in the upper portion of the fourth box 14. The support base portion 151 is provided on the front side of the paper surface of the support wall portion 146 and in the range from the joint portion 142 of the fourth box 14 to the back side of the paper surface.

As shown in FIG. 7, when viewed from the rotation axis X direction, the oil catch portion 15 and the accommodating portion 140 of the differential case 50 communicate with each other on the vertical VL side (right side in the drawing) of the oil catch portion 15. A mouth 147 is formed. The communication port 147 is formed by cutting out a part of the support wall portion 146.
The communication port 147 is provided in a range that crosses the vertical line VL from the breather chamber 16 side (right side in the figure) to the oil catch portion 15 side (left side in the figure) when viewed from the rotation axis X direction.

As shown in FIG. 9, in the present embodiment, when the vehicle equipped with the power transmission device 1 is traveling forward, the differential case 50 rotates in the counterclockwise direction CCW around the rotation axis X when viewed from the third box 13 side. ..
Therefore, the oil catch portion 15 is located on the downstream side in the rotation direction of the differential case 50. The width of the communication port 147 in the circumferential direction is wider on the left side of the vertical line VL than on the right side. The left side of the vertical line VL is the downstream side in the rotation direction of the differential case 50, and the right side is the upstream side. As a result, most of the oil OL scraped up by the differential case 50 that rotates around the rotation axis X can flow into the oil catch portion 15.

Further, as shown in FIG. 12, the outer peripheral position of the rotary orbit of the second shaft portion 446 of the pinion shaft 44 and the outer peripheral position of the rotary orbit of the large-diameter gear portion 431 are offset in the radial direction of the rotary shaft X. ing. The outer peripheral position of the rotary orbit of the second shaft portion 446 is located on the inner diameter side of the outer peripheral position of the rotary orbit of the large-diameter gear portion 431. Therefore, there is a space margin on the outer diameter side of the second shaft portion 446. By using this space and providing the oil catch portion 15, the space inside the main body box 10 can be effectively used.

In this embodiment, the manual plate 35 of the park lock mechanism 3 described later, the detent spring 36, and the manual shaft 37 rotationally driven by the park-by-wire actuator ACT are arranged using this space (). (See FIG. 17).

As shown in FIG. 12, the second shaft portion 446 projects toward the back side of the small diameter gear portion 432 when viewed from the motor 2. The peripheral member of the second shaft portion 446 (for example, the guide portion 78 of the differential case 50 that supports the second shaft portion 446) is located close to the oil catch portion 15.
Therefore, the oil OL (lubricating oil) can be smoothly supplied from the peripheral member to the oil catch portion 15.

As shown in FIG. 8, an end portion on the outer diameter side of the oil hole 151a is opened on the inner side of the support base portion 151. The oil hole 151a extends in the fourth box 14 toward the inner diameter side. The inner diameter side end of the oil hole 151a is open to the inner circumference of the support portion 145.
As shown in FIG. 2, in the support portion 145, the end portion on the inner diameter side of the oil hole 151a is opened between the lip seal RS and the bearing B2.

Further, a support hole 151b of the manual shaft 37, which will be described later, is provided on the front side (motor 2 side) of the support base portion 151.
The support hole 151b is provided in the build-up portion 156 provided at the corner of the support base portion 151 with the opening facing upward.

As shown in FIGS. 10 and 12, an oil guide 152 is placed on the support base portion 151.
The oil guide 152 has a catch portion 153 and a guide portion 154 extending from the catch portion 153 to the first box 11 side (the front side of the paper surface in FIG. 10).

As shown in FIG. 12, the support base portion 151 is stepped on the radial side of the rotation axis X at a position overlapping a part of the differential case 50 (first case portion 6, second case portion 7) when viewed from above. It is provided so as to avoid interference with the attached pinion gear 43 (large diameter gear portion 431).
The catch portion 153 is provided at a position overlapping the second shaft portion 446 of the pinion shaft 44 when viewed from the radial direction of the rotation shaft X. Further, the guide portion 154 is provided at a position where it overlaps the first shaft portion 445 of the pinion shaft 44 and the large diameter gear portion 431.

Therefore, when the differential case 50 rotates around the rotation axis X, the oil OL scraped up by the differential case 50 moves toward the catch portion 153 and the guide portion 154 side.

As shown in FIG. 10, a wall portion 153a extending in a direction away from the support base portion 151 (upward) is provided on the outer peripheral edge of the catch portion 153. A part of the oil OL scraped up by the differential case 50 that rotates around the rotation axis X is stored in the oil guide 152.

On the back side of the catch portion 153 (the back side of the paper surface in FIG. 10), a notch portion 155 is provided in the wall portion 153a.
As shown in FIG. 12, the notch portion 155 is provided in a region facing the oil hole 151a. A part of the oil OL stored in the catch portion 153 is discharged from the notch portion 155 toward the oil hole 151a.

As shown in FIG. 11, the guide portion 154 is inclined downward away from the catch portion 153.
As shown in FIG. 10, 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 over the entire length of the guide portion 154 in the longitudinal direction. The wall portions 154a and 154a are connected to the wall portion 153a surrounding the outer circumference of the catch portion 153.
A part of the oil OL stored in the catch portion 153 is also discharged to the guide portion 154 side.

As shown in FIG. 11, the guide portion 154 extends toward the second box 12 at a position where it avoids interference with the differential case 50. The tip 154b of the guide portion 154 faces the oil hole 126a provided in the wall portion 120 of the second box 12 with a gap in the rotation axis X direction.
A boss portion 126 surrounding the oil hole 126a is provided on the outer periphery of the wall portion 120. One end of the pipe 127 is fitted into the boss portion 126 from the rotation axis X direction.

The pipe 127 passes through the outside of the second box 12 and extends to the third box 13. The other end of the pipe 127 communicates with an oil hole 136a (see FIG. 2) provided in the cylindrical connection wall 136 of the third box.

As shown in FIG. 9, a part of the oil OL scraped up by the differential case 50 rotating around the rotation axis X reaches the oil catch portion 15. As shown in FIG. 11, the oil OL is supplied to the internal space Sc (see FIG. 2) of the connecting wall 136 through the guide portion 154 and the pipe 127.

As shown in FIG. 2, the third box 13 is provided with a radial oil passage 137 communicating with the internal space Sc.
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 portion 132.

The axial oil passage 138 communicates with the oil reservoir 128 provided at the lower part of the second box 12 via the communication hole 112a provided at the joint portion 112 of the first box 11.
The oil sump portion 128 penetrates the inside of the peripheral wall portion 121 in the rotation axis X direction. The oil sump 128 is in contact with the gear chamber Sb provided in the fourth box 14.

In the gear chamber Sb, the disk-shaped plate member 8 is provided in a direction orthogonal to the rotation axis X. As described above, the plate member 8 divides the gear chamber Sb in the fourth box 14 into the first gear chamber Sb1 on the differential case 50 side and the second gear chamber Sb2 on the motor 2 side.

13 and 14 are views for explaining the plate member 8.
FIG. 13 is a plan view of the plate member 8 as viewed from the motor 2 side.
FIG. 14 is a schematic view of a cross section taken along the line AA in FIG.
As shown in FIG. 13, the plate member 8 has a ring-shaped base 80 when viewed from the motor 2 side. A ring-shaped support portion 801 that surrounds the through hole 800 is provided in the central portion of the base portion 80.

As shown in FIG. 13, connection pieces 81, 82, 83, 84 are provided on the outer peripheral edge 80c of the base 80.
Each of the connecting pieces 81, 82, 83, 84 extends radially outward from the outer peripheral edge 80c of the base 80. Bolt holes 81a, 82a, 83a, 84a are provided in the connection pieces 81, 82, 83, and 84, respectively.

The connecting piece 81 is provided at a position intersecting the vertical straight line VL at the upper part of the plate member 8. The connecting piece 81 extends along the vertical line VL in a direction away from the base 80.
On one side of the vertical line VL (left side in FIG. 13), one connection piece 82 and one 83 are provided on the upper side and the lower side of the horizontal line HL, respectively. These connecting pieces 82, 83 also extend away from the base 80.

On the other side of the vertical line VL (on the right side in FIG. 13), a connection piece 84 is provided below the horizontal line HL. The connection piece 84 passes below the horizon HL and passes through the lower edge of the connection piece 83 described above. The connecting piece 84 projects downward from a position intersecting a straight line HLa parallel to the horizontal line HL.

On the other side of the vertical line VL (on the right side in FIG. 13), the connection piece 85 is provided above the horizontal line HL. The connection piece 85 has a predetermined width in the circumferential direction around the rotation axis X. A bolt hole 85a is provided at a position of the connecting piece 85 near the vertical line VL. A support pin 85b is provided at a position closer to the horizon HL. The support pin 85b projects toward the front side of the paper surface.

A support boss 86 for a stopper pin 861, which will be described later, is provided on the surface 80a (see FIG. 14) of the plate member 8 on the motor 2 side.
The support boss 86 is located below the connection piece 81 located on the vertical line VL. The support boss 86 is adjacent to the connection piece 81.

As shown in FIG. 13, a mounting boss 87 is provided below the support boss 86. The mounting boss 87 is provided at a position where it passes through the support pin 85b and intersects the straight line HLb parallel to the horizontal line HL described above. The mounting boss 87 projects to the front side of the paper surface from the support boss 86 (see FIG. 14).
Further, a mounting boss 88 paired with the mounting boss 87 is provided below the support pin 85b in the vertical VL direction.

A mounting portion 89 of the support 33, which will be described later, is provided on the side (left side in the drawing) opposite to the support pin 85b when viewed from the mounting boss 87.
The mounting portion 89 is provided with two bolt holes 89a and 89a adjacent to each other in the horizontal line HL direction.

FIG. 15 is a view of the fourth box 14 as viewed from the motor 2 side. FIG. 15 shows the arrangement of the step portions 148d, 149d, and 17d that support the outer peripheral edge of the plate member 8.
In FIG. 15, in order to clarify the positions of the peripheral wall portions 148, 149 and the arc-shaped wall portion 17, the positions of the step portions 148d, 149d, and 17d, and the positions of the joint portions 142, they are hatched. Shown.
FIG. 16 is a view of the fourth box 14 as viewed from the motor 2 side. FIG. 16 shows a state in which the plate member 8 is attached.

As shown in FIG. 15, peripheral wall portions 148 and 149 are provided in the fourth box 14 when viewed from the rotation axis X direction. These peripheral wall portions 148 and 149 are located on the outer diameter side of the region of the support wall portion 146 where the tooth portions 146a are provided.
The peripheral wall portions 148 and 149 are formed in an arc shape centered on the rotation axis X.

The peripheral wall portion 148 is located below the oil catch portion 15 described above in the vertical VL direction.
The peripheral wall portion 148 when viewed from the rotation axis X direction is provided in a range that crosses the horizontal line HL passing through the rotation axis X from the upper side to the lower side.
The upper end portion 148a of the peripheral wall portion 148 is located in the vicinity of the support base portion 151. The lower end 148b of the peripheral wall portion 148 is located in the vicinity of the straight line HLa.

As shown in FIG. 15, the inner circumference 148c of the peripheral wall portion 148 when viewed from the rotation axis X direction forms an arc shape along the outer circumference of the plate member 8 (base portion 80). The inner diameter of the inner circumference 148c of the peripheral wall portion 148 with reference to the rotation axis X is slightly larger than the outer diameter with respect to the rotation axis X of the plate member 8.
Inside the peripheral wall portion 148, a stepped portion 148d recessed on the back side of the paper surface is provided.
When the plate member 8 is attached to the fourth box 14, the outer peripheral edge of the plate member 8 (base 80) comes into contact with the step portion 148d. The plate member 8 (base 80) comes into contact with the step portion 148d from the rotation axis X direction.

Two boss portions 18 having bolt holes 18a are provided on the outside of the peripheral wall portion 148. The boss portions 18 and 18 are integrally formed with the peripheral wall portion 148. The boss portions 18 and 18 are provided in the vicinity of the upper end portion 148a side of the peripheral wall portion 148 and the lower end portion 148b, respectively. The boss portions 18 and 18 project to the front side of the paper surface from the peripheral wall portion 148.

The peripheral wall portion 149 is located below the breather chamber 16. The peripheral wall portion 149 is located on the back side of the paper surface with respect to the wall portion 160 forming the breather chamber 16.
The upper end portion 149a of the peripheral wall portion 149 when viewed from the rotation axis X direction is connected to the boss portion 18 on the vertical line VL. A side wall portion 159 extending toward the oil catch portion 15 is further 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 box 14 on the lower side of the breather chamber 16.

As shown in FIG. 15, the inner circumference 149c of the peripheral wall portion 149 when viewed from the rotation axis X direction forms an arc shape along the outer circumference of the plate member 8 (base portion 80). The inner diameter of the inner circumference 149c of the peripheral wall portion 149 with reference to the rotation axis X is slightly larger than the outer diameter of the plate member 8 with reference to the rotation axis X.
Inside the peripheral wall portion 149, a stepped portion 149d recessed on the back side of the paper surface is provided.
When the plate member 8 is attached to the fourth box 14, the outer peripheral edge of the plate member 8 (base 80) comes into contact with the step portion 149d. The plate member 8 (base 80) comes into contact with the step portion 149d from the rotation axis X direction.

Two boss portions 18 having bolt holes 18a are provided on the outside of the peripheral wall portion 149. The boss portions 18 and 18 are integrally formed with the peripheral wall portion 149. The boss portions 18 and 18 are provided at intervals in the circumferential direction around the rotation axis X. The boss portions 18 and 18 are provided on the outer circumference of the upper end portion 148a of the peripheral wall portion 149 and the outer circumference of the region located below the breather chamber 16, respectively.
The boss portions 18 and 18 project to the front side of the paper surface from the peripheral wall portion 149.

In the fourth box 14, an arcuate wall portion 17 is provided in a region below the breather chamber 16 and below the horizon HL. The arc-shaped wall portion 17 is provided in a positional relationship that is approximately 180 ° out of phase with respect to the peripheral wall portion 148 in the circumferential direction around the rotation axis X.
As shown in FIG. 15, the inner circumference 17c of the arcuate wall portion 17 when viewed from the rotation axis X direction forms an arc shape along the outer circumference of the plate member 8 (base portion 80). The inner diameter of the inner circumference 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.
In the arc-shaped wall portion 17, a boss portion 18 having a bolt hole 18a is formed at a position intersecting the straight line HLa described above. The boss portion 18 projects toward the front side of the paper surface with respect to the arcuate wall portion 17.

A step portion 17d protrudes from the inner circumference of the boss portion 18 in the X direction of the rotation axis.
When the plate member 8 is attached to the fourth box 14, the outer peripheral edge of the plate member 8 (base 80) comes into contact with the step portion 17d. The plate member 8 (base 80) comes into contact with the step 17d from the rotation axis X direction.

Here, in the attachment of the plate member 8 to the fourth box 14, first, the outer peripheral edge of the plate member 8 (base 80) is attached to the peripheral wall portions 148, 149 step portions 148d, 149d, and the arc-shaped wall portion 17 step portion. The 17d is brought into contact with the rotation axis X direction. Subsequently, the plate member 8 is fixed to the fourth box 14 by screwing the bolt B penetrating the bolt holes 81a to 85a of the connecting pieces 81 to 85 into the bolt holes 18a of the corresponding boss portion 18 ( (See FIG. 16).

17 and 18 are views for explaining the park lock mechanism 3.
FIG. 17 is a perspective view of the fourth box 14 provided with the park lock mechanism 3 as viewed from diagonally above.
FIG. 18 is a plan view of the fourth box 14 provided with the park lock mechanism 3 as viewed from the motor 2 side.
19 to 21 are views for explaining the park lock mechanism 3.
FIG. 19 is a view of the park lock mechanism 3 as viewed from above.
FIG. 20 is a schematic view of a cross section taken along the line AA in FIG.
FIG. 21 is a schematic view of a CC cross section in FIG.

As shown in FIG. 17, the park lock mechanism 3 includes a park gear 30, a park pole 31, a park rod 32, a support 33, a holder 34, a manual plate 35, a detent spring 36, a manual shaft 37, and the like. have.
When the sensor detects that the vehicle equipped with the power transmission device 1 switches between the traveling mode and the parking mode, the park lock mechanism 3 rotates the manual shaft 37 around the rotation axis Y (see FIG. 19) by the actuator ACT. It is a park-by-wire type park lock mechanism.

In the present embodiment, the park gear 30, the park pole 31, the park rod 32, the support 33, and the holder 34 are located on the motor 2 side of the plate member 8, and the manual plate 35 and the detent are located on the opposite side. The spring 36 and the manual shaft 37 are located.

The holder 34 is a plate-shaped member having a substantially rectangular shape when viewed from the rotation axis X direction. The holder 34 includes a protrusion 341 for supporting the park pole 31. The holder 34 is provided with bolt holes 34a and 34a on both sides in the longitudinal direction.
The holder 34 is attached to the mounting bosses 87 and 88 of the plate member 8 with bolts B and B.
As shown in FIGS. 17 and 18, the holder 34 is provided in a range from above the park gear 30 to below the breather chamber 16 when viewed from the rotation axis X direction.

As shown in FIG. 16, the holder 34 is inclined downward in the vertical VL direction toward the breather chamber 16 side (right side in the drawing) when viewed from the rotation axis X direction. The lower edge 342 of the holder 34 is inclined so as to be located on the lower side in the vertical line VL direction toward the breather chamber 16 side (right side in the drawing).

As shown in FIGS. 17 and 18, the park pole 31 is supported by the plate member 8 via the holder 34.
The park pole 31 is an integral part having a first plate-shaped portion 310 having an insertion hole 310d and a second plate-shaped portion 311 having a claw portion 311c.

A protrusion 341 on the holder 34 side is inserted into the insertion hole 310d of the park pole 31. The park pole 31 is rotatably supported by the protrusion 341 and is rotatable around an axis X2 parallel to the rotation axis X.
As shown in FIG. 18, the first plate-shaped portion 310 when viewed from the rotation axis X direction extends upward from the region supported by the protrusion 341 along the straight line Lx1 orthogonal to the axis X2.
The first plate-shaped portion 310 extends to a position substantially the same height as the support boss 86 of the plate member 8, and then bends in a direction away from the breather chamber 16 (to the left in the drawing).
In the first plate-shaped portion 310, the region beyond the bent portion 310e extends along the straight line Lx2, and the tip end side of this region serves as the operated portion 310c operated by the cam 320 of the park rod 32. There is.
The operated portion 310c is mounted on the cam 320 supported by the support 33.

As shown in FIG. 18, a claw portion 311c, which is an engaging portion with the park gear 30, is provided below the second plate-shaped portion 311 when viewed from the rotation axis X direction.
The claw portion 311c is formed so as to bulge from the lower portion of the second plate-shaped portion 311 toward the rotation axis X side.

In the first plate-shaped portion 310 of the park pole 31, a locking hole 310f is provided on the side of the insertion hole 310d. One end of the spring Sp is engaged with the locking hole 310f (see FIG. 18). The other end of the spring Sp is in pressure contact with the outer peripheral edge 80c of the plate member 8. The spring Sp is extrapolated to the support pin 85b of the plate member 8. In this state, the spring Sp exerts an urging force on the park pole 31. The park pole 31 is an urging force acting from the spring Sp, and is always urged in the direction in which the claw portion 311c is separated from the park gear 30 (counterclockwise direction in FIG. 18: see the arrow).

As described above, the park pole 31 can rotate around the axis X2 parallel to the rotation axis X.
As shown in FIG. 3, the first plate-shaped portion 310 of the park pole 31 is arranged between the holder 34 and the plate member 8 in the rotation axis X direction. The second plate-shaped portion 311 is located on the motor 2 side (right side in the drawing) with respect to the first plate-shaped portion 310, and extends downward on the inner diameter side of the holder 34.

As shown in FIG. 18, the park rod 32 is provided in a direction along a straight line Lx3 passing above the horizontal line HL when viewed from the rotation axis X direction. The park rod 32 is orthogonal to the rotation axis X.
The park rod 32 is provided with the tip side on which the cam 320 is extrapolated facing the park pole 31 side (breather chamber 16 side). The cam 320 is inserted between the support 33 and the operated portion 310c of the park pole 31.

As shown in FIG. 20, in cross-sectional view, the support 33 has an arcuate bottom wall portion 331, side wall portions 332 and 333 extending upward from both sides of the bottom wall portion 331, and a connecting piece 334 extending downward from the bottom wall portion 331. And have.
The support 33 is fixed to the mounting portion 89 of the plate member 8 by a bolt B penetrating the connecting piece 334.

As shown in FIG. 20, inside the power transmission device 1, the support 33 is fixed to the plate member 8 in a state where one side wall portion 333 is in contact with the wall portion 120 of the second box 12. Further, the support 33 is provided with the other side wall portion 332 with a gap between the support 33 and the plate member 8.

In the support 33, the portion composed of the bottom wall portion 331 and the side wall portions 332 and 333 on both sides of the bottom wall portion 331 has a substantially U-shape in cross-sectional view. The support 33 is provided with the opening of the substantially U-shaped portion facing upward.

As shown in FIG. 21, in the support 33, a cam portion 335 is provided on the inner circumference of the breather chamber 16 side (right side in the drawing). The upper surface 335a of the cam portion 335 is located above the upper surface 331a of the bottom wall portion 331.
In the park rod 32, the cam 320 is extrapolated on the tip 32a side.
The cam 320 is urged toward the tip 32a by the urging force of a spring (not shown).

When the park rod 32 is displaced in the direction in which the cam 320 is pushed between the support 33 and the operated portion 310c of the park pole 31 (to the right in FIG. 21), the cam 320 mounted on the cam portion 335 is moved to the operated portion. Push up 310c.
As a result, the park pole 31 is rotated in the clockwise direction in FIG. 18 and is arranged at a position where the claw portion 311c is engaged with the outer circumference of the park gear 30 (engagement position: see FIG. 17).

When the park rod 32 is displaced in the direction in which it is pulled out from between the support 33 and the operated portion 310c of the park pole 31 (leftward in FIG. 21), the cam 320 of the park rod 32 descends from the cam portion 335 to the bottom wall. It reaches the upper surface 331a of the portion 331 (see the virtual line in FIG. 21).
As a result, the park pole 31 is rotated in the counterclockwise direction in FIG. 18 by the urging force of the spring Sp to the position where the claw portion 311c is separated from the outer circumference of the park gear 30 (disengagement position: see FIG. 18). Be placed.

As shown in FIG. 19, the other end 32b of the park rod 32 is supported by the connecting portion 355 of the manual plate 35. In this state, the park rod 32 is provided so as to be displaceable in the axial direction while being prevented from falling off from the connecting portion 355.

The manual plate 35 has a base portion 351 that is externally inserted into the manual shaft 37, and an arm portion 353 and an engaging portion 352 that extend in the radial direction of the rotation axis Y of the manual shaft 37 from the outer circumference of the base portion 351.

The base portion 351 is fixed to the manual shaft 37 in a state where the relative rotation with the manual shaft 37 is restricted.
The arm portion 353 extends from the outer circumference of the base portion 351 in a direction approaching the motor 2. When viewed from the radial direction of the rotation shaft X, the arm portion 353 crosses the outer diameter side of the plate member 8 toward the motor 2.

As shown in FIG. 17, the tip end side of the arm portion 353 is bent to the lower side (rotational shaft) side, and then the connecting portion 355 is connected to the support portion 354 fixed to the upper surface.

Further, as shown in FIG. 19, the tip end side of the engaging portion 352 extending from the base portion 351 is formed to be wide with a predetermined range in the circumferential direction of the rotation axis Y. A plurality of recesses continuous in the circumferential direction are provided on the outer periphery of this wide region. The roller 365 of the detent spring 36 is elastically engaged with one of these plurality of recesses.

The base end portion 361 of the detent spring 36 in the longitudinal direction is fixed to the fourth box 14 with bolts B. The tip side on which the roller 365 is provided can be elastically displaced in the radial direction of the base portion 351 of the manual plate 35. Further, the tip side on which the roller 365 is provided is in pressure contact with the outer circumference (recess) of the base portion 351 of the manual plate 35.

In the present embodiment, the manual shaft 37 rotates around the rotation axis Y in conjunction with the switching of the traveling mode / parking mode of the vehicle equipped with the power transmission device 1.
When the manual shaft 37 rotates, the manual plate 35 fixed to the manual shaft 37 also rotates around the rotation axis Y. Then, the arm portion 353 extending from the base portion 351 of the manual plate 35 and the connecting portion 355 fixed to the support portion 354 at the tip of the arm portion 353 are displaced in the circumferential direction around the rotation axis Y. The park rod 32 connected to the connecting portion 355 is also displaced in the longitudinal direction of the park rod 32.

22 and 23 are views for explaining the support of the manual shaft 37 in the fourth box 14.
FIG. 22 is a perspective view of the built-up portion 156 provided on the support base portion 151 as viewed from diagonally below.
FIG. 23 is a view of the support base portion 151 as viewed from the motor 2 side. In FIG. 23, a part of the support base portion 151 and a portion of the overlay portion 156 are cut out and shown in a cross section. For convenience of explanation, the manual plate 35 and the detent spring 36 are not shown.

As shown in FIG. 8, a build-up portion 156 is locally provided at a corner of the support base portion 151 on the rotation axis X side. The overlay portion 156 is formed by using the constituent material of the fourth box 14.
A support hole 151b for rotatably supporting the lower end of the manual shaft 37 is provided in the built-up portion 156 with the opening facing upward.

As shown in FIG. 22, the overlay portion 156 bulges downward from the support base portion 151 toward the peripheral wall portion 148 side. The overlay portion 156 is connected to the root of the tooth portion 146a at a position adjacent to the communication port 147 among the plurality of tooth portions 146a provided on the support wall portion 146.

The overlay portion 156 is provided so as to straddle the tooth portion 146a and the support base portion 151. The overlay portion 156 bulges from the surface of the support wall portion 146 on the motor 2 side toward the motor 2.
As shown in FIG. 23, the thickness W156 of the built-up portion 156 in the rotation axis Y direction of the manual shaft 37 is thicker than the thickness W151 of the support base portion 151. Further, the radial thickness W156'of the rotation axis Y of the overlay portion 156 is thicker than the diameter D37 of the manual shaft 37.

As described above, in the support hole 151b of the build-up portion 156, the lower end side of the manual shaft 37 is rotatably supported. The manual shaft 37 penetrates the peripheral wall portion 141 of the fourth box 14 to the outside. The upper end side of the manual shaft 37 is connected to an actuator ACT attached to the outer circumference of the fourth box 14.

In the region of the manual shaft 37 between the peripheral wall portion 141 and the support base portion 151, the manual plate 35 of the park lock mechanism 3 described above is connected so as not to rotate relative to each other.
A roller 365 of the detent spring 36 is elastically engaged with the outer circumference of the manual plate 35. The urging force acting from the roller 365 regulates the rotation of the manual shaft 37 (see FIG. 17).

The manual shaft 37 rotates around the rotation axis Y by the driving force of the actuator ACT in conjunction with the switching of the traveling mode / parking mode of the vehicle equipped with the power transmission device 1.
At this time, the manual shaft 37 rotates about the rotation axis Y against the regulatory force acting on the roller 365.
Therefore, torsional stress acts on the built-up portion 156 that supports the lower end of the manual shaft 37. Here, the overlay portion 156 is formed to be thicker than the support base portion 151, and straddles the support base portion 151 and the support wall portion 146 (a part of the tooth portions 146a). It is formed integrally.
Therefore, the build-up portion 156 has sufficient rigidity to withstand the torsional stress acting on the built-up portion 156, so that the support stability of the manual shaft 37 is ensured.

The operation of the power transmission device 1 having such a configuration will be described.
As shown in FIG. 1, in the power transmission device 1, the planetary reduction gear 4, the differential mechanism 5, and the drive shafts 9 (9A, 9B) are provided along the transmission path of the output rotation of the motor 2. ing.
A park gear 30 of the park lock mechanism 3 is provided between the motor 2 and the planetary reduction gear 4 in the power transmission path.

When the vehicle equipped with the power transmission device 1 is in the parking mode, the park pole 31 is arranged at a position where the claw portion 311c is engaged with the park gear 30 (engagement position: see FIG. 17). Therefore, the motor shaft 20 to which the park gear 30 is attached is in a state in which the rotation around the rotation shaft X is restricted.
In this state, the rotation of the drive wheels W and W is restricted, and the vehicle equipped with the power transmission device 1 is in a parked state.

When the mode of the vehicle equipped with the power transmission device 1 is switched from the parking mode to the traveling mode, the manual shaft 37 rotates around the rotation axis Y by the driving force of the actuator ACT.
As a result, the manual shaft 37 displaces the roller 365 of the detent spring 36 from the angular position engaged with the recess 352a (see FIG. 19) of the manual plate 35 to the angular position engaged with the recess 352b.

Then, the rotation of the manual plate 35 around the rotation axis Y causes the park rod 32 to be displaced in the direction of pulling out the cam 320 from between the support 33 and the operated portion 310c of the park pole 31 (left direction in FIG. 19).
Then, when the cam 320 is pulled out from between the support 33 and the operated portion 310c of the park pole 31, the park pole 31 is rotated around the axis X1 by the urging force of the spring Sp, and the claw portion 311c Departs from the outer circumference of the park gear 30.

Then, the motor shaft 20 to which the park gear 30 is attached is in a state where rotation around the rotation axis X is permitted.
In this state, the rotation of the drive wheels W and W is allowed, and the vehicle equipped with the power transmission device 1 is in a state in which it can travel.

As shown in FIG. 2, when the motor 2 is driven and the rotor core 21 rotates around the rotation axis X in this state, the sun gear 41 of the planetary reduction gear 4 is passed through the motor shaft 20 that rotates integrally with the rotor core 21. The rotation is input to.

As shown in FIG. 2, in the planetary reduction gear 4, the sun gear 41 is an input unit for the output rotation of the motor 2. The differential case 50 that supports the stepped pinion gear 43 serves as an output unit for the input rotation.

When the sun gear 41 rotates around the rotation axis X by the input rotation, the stepped pinion gear 43 (large diameter gear portion 431, small diameter gear portion 432) rotates around the axis X1 by the rotation input from the sun gear 41 side. (See Fig. 3).
Here, the small-diameter gear portion 432 of the stepped pinion gear 43 meshes with the ring gear 42 fixed to the inner circumference of the fourth box 14. Therefore, the stepped pinion gear 43 revolves around the rotation axis X while rotating around the axis X1.

Here, the outer diameter R2 of the small-diameter gear portion 432 of the stepped pinion gear 43 is smaller than the outer diameter R1 of the large-diameter gear portion 431 (see FIG. 3).
As a result, the differential case 50 (first case portion 6, second case portion 7) that supports the stepped pinion gear 43 rotates around the rotation axis X at a rotation speed lower than the rotation input from the motor 2 side.
Therefore, the rotation input to the sun gear 41 of the planetary reduction gear 4 is greatly reduced by the stepped pinion gear 43. The reduced rotation is output to the differential case 50 (differential mechanism 5).

Then, the differential case 50 rotates around the rotation axis X by the input rotation, so that the drive shafts 9 (9A, 9B) that mesh with the pinion mate gear 52 rotate around the rotation axis X in the differential case 50 ( (See Fig. 2). As a result, the left and right drive wheels W and W (see FIG. 1) of the vehicle on which the power transmission device 1 is mounted are rotated by the transmitted rotational driving force.

As shown in FIG. 2, the lubricating oil OL is stored inside the fourth box 14. Therefore, the stored oil OL is scraped up by the differential case 50 that rotates around the rotation axis X when the output rotation of the motor 2 is transmitted.
Due to the oil OL scraped up, the meshing portion between the sun gear 41 and the large diameter gear portion 431, the meshing portion between the small diameter gear portion 432 and the ring gear 42, and the meshing portion between the pinion mate gear 52 and the side gears 54A and 54B. Is lubricated.

As shown in FIG. 9, the differential case 50 rotates in the counterclockwise direction CCW around the rotation axis X when viewed from the third box 13 side.
An oil catch portion 15 is provided on the upper portion of the fourth box 14. The oil catch portion 15 is located on the downstream side in the rotation direction of the differential case 50. Most of the oil OL scraped up by the differential case 50 flows into the oil catch portion 15.

As shown in FIG. 12, a manual plate 35 supported by a manual shaft 37 is arranged in the oil catch portion 15.
The support hole 151b that supports the lower end of the manual shaft 37 is located on the motor 2 side in the oil catch portion 15. The support hole 151b is provided at a position overlapping the ring gear 42 in the X direction of the rotation axis.
As described above, the engaging teeth 421 on the outer circumference of the ring gear 42 mesh with the tooth portions 146a of the support wall portion 146 of the fourth box 14. The ring gear 42 is restricted from rotating around the rotation axis X.

Therefore, when the differential case 50 rotates around the rotation axis X, the scraped oil OL does not reach the region located on the outer diameter side of the ring gear 42. In the present embodiment, since the support hole 151b is provided on the outer diameter side of the ring gear 42, the manual shaft 37 whose lower end is supported by the support hole 151b is also located at a position where the scraped oil OL does not directly interfere with each other. Be placed.

Therefore, the flow of the oil OL that is scraped up and flows into the oil catch portion 15 is not significantly obstructed by the manual shaft 37. Therefore, most of the scraped up oil OL is supplied to the oil guide 152 placed on the support base portion 151 in the oil catch portion 15.

As described above, the power transmission device 1 according to the present embodiment has the following configuration.
(1) The power transmission device 1 is
A differential mechanism 5 that overlaps the motor 2 in the X direction (axial direction) of the rotation axis,
A differential case 50 (case) accommodating the differential mechanism 5 and
Stepped pinion gear 43 (pinion gear) supported by the differential case 50,
A ring gear 42 that meshes with the stepped pinion gear 43 is provided in the main body box 10.
The fourth box 14 of the main body box 10 has a support wall portion 146 (engagement portion) including a tooth portion 146a that engages with the ring gear 42 on the outer periphery of the ring gear 42.
The manual shaft 37 of the park lock mechanism 3 is inserted and supported in the built-up portion 156 protruding from the support wall portion 146 toward the motor 2 in the rotation axis X direction.

By providing the overlay portion 156 in this way, the actuator can be motorized so that the vehicle parts located on the opposite side of the motor 2 (the back side of the paper in FIG. 18) and the actuator of the park lock mechanism 3 do not interfere with each other. It can be moved to the 2 side.
Since a build-up portion 156 is formed by using a part of the main body box 10 at a position adjacent to the support wall portion 146 (engagement portion) that supports the ring gear 42, a dedicated support portion of a separate member from the main body box 10 is provided. There is no need to provide it. Therefore, it is possible to preferably prevent the number of parts from increasing due to the support of the manual shaft 37.

The power transmission device 1 has the following configuration.
(2) The build-up portion 156 is acyclic and locally provided.

The entire annular support wall portion 146 may be projected when viewed from the rotation axis X direction to form an annular build-up portion that serves as a support portion for the manual shaft 37. However, by configuring as described above and forming the non-annular and local overlay portion 156, it is possible to suppress the weight increase of the main body box 10 and reduce the space in the gear chamber Sb of the fourth box 14. Can be suppressed. As a result, the space of the oil catch portion 15 is not narrowed, and the oil guide 152, the manual plate 35, and the like can be arranged using this space.
Therefore, the limited space in the main body box 10 can be effectively utilized.

The power transmission device 1 has the following configuration.
(3) The fourth box 14 of the main body box 10 has a support base portion 151 (shelf portion) above the horizontal line HL passing through the rotation center of the differential case 50.
The overlay portion 156 is arranged at a corner portion of the support base portion 151.

The scraped oil OL is introduced into the support base 151. By inserting the manual shaft 37 into the corner of the support base 151 and supporting it, even if the manual shaft 37 is arranged above the support base 151, the oil OL can be smoothly introduced into the support base 151. Can be done.

In the above-described embodiment, the park-by-wire actuator and the manual shaft are connected, but it can also be applied to the manual shaft in the mechanical link type park mechanism.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments shown in these embodiments. It can be changed as appropriate within the scope of the technical idea of the invention.

1 Power transmission device 10 Main body box (box)
146 Support wall part (engagement part)
151 Support base (shelf)
156 Overlay 2 Motor 3 Park lock mechanism 37 Manual shaft 42 Ring gear 43 Stepped pinion gear (pinion gear)
5 Differential mechanism 50 Diff case (case)
HL horizon X rotation axis

Claims (3)

1. A differential mechanism that overlaps the motor in the axial direction,
   A case accommodating the differential mechanism and
   The pinion gear supported by the case and
   A ring gear that meshes with the pinion gear is provided in the box.
   The box has an engaging portion that engages with the ring gear on the outer circumference of the ring gear.
   A power transmission device in which a manual shaft of a park lock mechanism is inserted and supported in a built-up portion that protrudes from the engaging portion toward the motor in the axial direction.
2. In claim 1,
   The built-up portion is a non-annular and locally provided power transmission device.
3. In claim 1 or 2,
   The box has a shelf above the horizon passing through the center of rotation of the case.
   The built-up portion is a power transmission device arranged at a corner portion of the shelf portion.

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