CN113285564B

CN113285564B - Driving device

Info

Publication number: CN113285564B
Application number: CN202110121612.6A
Authority: CN
Inventors: 古川大地; 藤本祥平
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2020-01-31
Filing date: 2021-01-28
Publication date: 2024-04-05
Anticipated expiration: 2041-01-28
Also published as: CN113285564A; JP7415617B2; JP2021125896A

Abstract

The present invention provides a driving device, which comprises: a motor having a rotor rotatable about a motor axis extending in a direction intersecting the vertical direction and a bearing rotatably supporting the rotor; an annular support portion for supporting the bearing on the inner side; an oil path portion having an upper opening portion that opens to an outside of the support portion and an upper side in a vertical direction, and extending from the outside of the support portion to an inside of the support portion; a guide portion that is located around the upper opening portion and guides oil to the oil path portion; and an oil injection portion having a first injection port overlapping the oil passage portion when viewed in the vertical direction. The first injection port is located at a position above the upper opening in the vertical direction and opens toward the guide portion.

Description

Driving device

Technical Field

The present invention relates to a driving device.

Background

A structure is known in which oil injected from an oil injection portion is supplied to a bearing. For example, patent document 1 describes a tube as such an oil injection portion.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication No. 2011-259644

Disclosure of Invention

Problems to be solved by the invention

In the above-described configuration, it is conceivable to provide an oil passage portion in an annular support portion that supports the bearing, and supply oil to the bearing through the oil passage portion. However, when the oil is injected only toward the oil passage portion, the oil may splash on the inner surface of the oil passage portion or the like and may be scattered outside the oil passage portion. Therefore, there is a problem in that the amount of oil supplied to the bearing via the oil passage portion is reduced.

In view of the above, it is an object of the present invention to provide a drive device having a structure capable of suppressing a reduction in the amount of oil supplied to a bearing.

Means for solving the problems

The driving device of the present invention includes: a motor having a rotor rotatable about a motor axis extending in a direction intersecting the vertical direction and a bearing rotatably supporting the rotor; an annular supporting portion for supporting the bearing on the inner side; an oil passage portion having an upper opening portion that opens to an upper side in a vertical direction outside the support portion and that extends from the outside of the support portion to an inside of the support portion; a guide portion located around the upper opening portion for guiding oil to the oil path portion; and an oil injection part having a first injection port overlapping the oil passage part when viewed in the vertical direction. The first injection port is located on the upper side of the upper opening in the vertical direction and opens toward the guide portion.

Effects of the invention

According to an aspect of the present invention, it is possible to suppress a decrease in the amount of oil supplied to the bearing.

Drawings

Fig. 1 is a schematic configuration diagram schematically showing a driving device according to a first embodiment.

Fig. 2 is a perspective view showing the stator, the first oil ejecting portion, and the second oil ejecting portion according to the first embodiment.

Fig. 3 is a view of the stator, the first oil ejecting portion, and the second oil ejecting portion of the first embodiment as viewed from the upper side.

Fig. 4 is a perspective cross-sectional view showing the first oil injection portion, the oil passage portion, and the guide portion for guiding the oil to the oil passage portion of the first embodiment.

Fig. 5 is a cross-sectional view showing the first oil injection portion, the second oil injection portion, the oil passage portion, and the guide portion for guiding the oil to the oil passage portion of the first embodiment.

Fig. 6 is a cross-sectional view showing the first oil jet part and the first bearing according to the first embodiment.

Fig. 7 is a cross-sectional view showing the second oil jet part and the second bearing of the first embodiment.

Fig. 8 is a cross-sectional view showing a part of the driving device according to the first embodiment, and is a cross-sectional view VIII-VIII of fig. 1.

Fig. 9 is a view of a part of the second oil ejection portion of the first embodiment as viewed in the second direction.

Fig. 10 is a cross-sectional view showing a first oil jet part and a first bearing according to a second embodiment.

Fig. 11 is a cross-sectional view showing a second oil jet part and a second bearing according to the second embodiment.

Fig. 12 is a cross-sectional view showing a first oil injection portion, an oil passage portion, and a guide portion for guiding oil to the oil passage portion according to the third embodiment.

In the figure:

1-drive device, 2-motor, 6-housing, 11, 311-first oil injection part (oil injection part), 13a, 13b, 14a, 14 b-injection port (second injection port), 15a, 315 a-first supply port (first injection port), 215 b-second supply port (first injection port), 64 e-inclined surface, 20-rotor, 26-first bearing (bearing), 27-second bearing (bearing), 30-stator, 31-coil assembly, 31 a-coil, 32-stator core, 33-coil end, 364J-recess, 63 c-coating part, 64, 164-support part, 64 c-through part, 64 d-connection part, 66, 366-first rib, 67-second rib, 68, 168, 368-oil passage part, 68a, 168a, 368 a-upper opening part, 69, 369-guide part, 212-second oil injection part (oil injection part), J1-motor shaft, O-oil.

Detailed Description

In the following description, the vertical direction is specified based on the positional relationship in the case where the driving device of each embodiment is mounted on a vehicle that is positioned on a horizontal road surface. That is, the relative positional relationship with respect to the vertical direction described in each of the following embodiments may satisfy at least the case where the driving device is mounted on a vehicle that is positioned on a horizontal road surface.

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is the upper side in the vertical direction, and the-Z side is the lower side in the vertical direction. In the following description, the upper side in the vertical direction will be simply referred to as "upper side", and the lower side in the vertical direction will be simply referred to as "lower side". The X-axis direction is a direction orthogonal to the Z-axis direction and is a front-rear direction of a vehicle on which the drive device is mounted. In the following embodiments, the +x side is the front side of the vehicle, and the-X side is the rear side of the vehicle. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and is a left-right direction of the vehicle, that is, a vehicle width direction. In the following embodiments, the +y side is the left side of the vehicle, and the-Y side is the right side of the vehicle. The front-rear direction and the left-right direction are horizontal directions orthogonal to the vertical direction.

The positional relationship in the front-rear direction is not limited to the positional relationship in each of the following embodiments, and the +x side may be the rear side of the vehicle, and the-X side may be the front side of the vehicle. In this case, the +y side is the right side of the vehicle, and the-Y side is the left side of the vehicle.

The motor axis J1 appropriately shown in each drawing extends in a direction intersecting the vertical direction. More specifically, the motor axis J1 extends in the Y-axis direction orthogonal to the vertical direction, that is, in the left-right direction of the vehicle. In the following description, unless otherwise specified, a direction parallel to the motor axis J1 is simply referred to as an "axial direction", a radial direction centered on the motor axis J1 is simply referred to as a "radial direction", and a circumferential direction centered on the motor axis J1, that is, an axis around the motor axis J1 is simply referred to as a "circumferential direction". In the present specification, "parallel direction" also includes a substantially parallel direction, and "orthogonal direction" also includes a substantially orthogonal direction.

< first embodiment >, first embodiment

The drive device 1 of the present embodiment shown in fig. 1 is mounted on a vehicle using a motor as a power source, such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an Electric Vehicle (EV), and is used as a power source thereof. As shown in fig. 1, the driving device 1 includes a motor 2, a transmission device 3 including a reduction gear 4 and a differential gear 5, a casing 6, an oil pump 96, a cooler 97, a first oil injection portion 11, and a second oil injection portion 12. As shown in fig. 1 to 3, in the present embodiment, the motor 2 is an inner rotor type motor. The motor 2 has a rotor 20, a stator 30, a first bearing 26, and a second bearing 27. In the present embodiment, the driving device 1 does not include an inverter unit. In other words, the driving device 1 is of a separate structure from the inverter unit.

The housing 6 accommodates the motor 2 and the transmission 3 therein. The housing 6 has a motor housing portion 61, a gear housing portion 62, and a partition 63. The motor housing 61 is a portion that houses the rotor 20 and the stator 30, which will be described later, therein. The gear housing 62 is a portion that houses the transmission device 3 inside. The gear housing 62 is located on the left side of the motor housing 61. The bottom 61a of the motor housing 61 is located above the bottom 62a of the gear housing 62. The partition 63 axially divides the inside of the motor housing 61 and the inside of the gear housing 62. The partition 63 is provided with a partition opening 63a. The partition wall opening 63a connects the inside of the motor housing 61 and the inside of the gear housing 62. The partition 63 is located on the left side of the stator 30.

The casing 6 accommodates oil O as a refrigerant therein. In the present embodiment, the oil O is accommodated in the motor accommodation portion 61 and the gear accommodation portion 62. A sump P for storing oil O is provided in a lower region of the inside of the gear housing 62. The oil O in the oil sump P is supplied to the inside of the motor housing 61 through an oil passage 90 described later. The oil O delivered to the inside of the motor housing 61 is stored in a lower region of the inside of the motor housing 61. At least a part of the oil O stored in the motor housing 61 moves toward the gear housing 62 through the partition opening 63a and returns to the oil sump P.

In the present specification, the term "oil is contained in a certain portion" means that the oil is located in a certain portion at least in a part of the time of driving the motor, or the oil is not located in a certain portion of the time of stopping the motor. For example, in the present embodiment, the oil O is contained in the motor containing portion 61, and at least a part of the oil O may be located in the motor containing portion 61 when the motor 2 is driven, or all of the oil O in the motor containing portion 61 may pass through the partition wall opening 63a and move to the gear containing portion 62 when the motor 2 is stopped. A part of the oil O supplied to the inside of the motor housing 61 through the oil passage 90 described later may remain in the inside of the motor housing 61 in a state where the motor 2 is stopped.

The oil O circulates in an oil passage 90 described later. The oil O is used for lubrication of the reduction gear unit 4 and the differential gear unit 5. In addition, the oil O is used for cooling the motor 2. As the oil O, in order to function as lubricating oil and cooling oil, it is preferable to use oil equivalent to lubricating oil for an automatic transmission (ATF: automatic Transmission Fluid) having a low viscosity.

As shown in fig. 4 and 5, the housing 6 includes a support 64, a plurality of radial ribs 65, a first rib 66, and a second rib 67. That is, the driving device 1 includes a support 64, a plurality of radial ribs 65, a first rib 66, and a second rib 67. As shown in fig. 6, the support portion 64 protrudes rightward from the partition wall 63. The support portion 64 is located inside the motor housing portion 61. The support 64 is annular about the motor axis J1. More specifically, the support portion 64 is cylindrical and opens on both sides in the axial direction about the motor shaft J1. The support portion 64 supports the first bearing 26 on the inner side. The support portion 64 has a small diameter portion 64a and a large diameter portion 64b.

The small diameter portion 64a is a left side portion of the support portion 64. The left end of the small diameter portion 64a is connected to the partition 63. The large diameter portion 64b is a right side portion of the support portion 64. The inner diameter of the large diameter portion 64b is larger than the inner diameter of the small diameter portion 64 a. The first bearing 26 is supported radially inward of the large diameter portion 64b. A step 64h is provided between the small diameter portion 64a and the large diameter portion 64b in the axial direction on the inner peripheral surface of the support portion 64. The right-facing step surface 64i of the steps 64h supports the outer race of the first bearing 26 from the left side.

As shown in fig. 4, the support portion 64 has a through portion 64c that penetrates the support portion 64 from the outer surface to the inner surface. In the present embodiment, the through portion 64c is a groove recessed to the left side (+y side) and extending in the radial direction. The through portion 64c opens on the right side (-Y side), and opens inside the motor housing portion 61. The through portion 64c is provided at an upper portion of the support portion 64. As shown in fig. 5, in the present embodiment, the through portion 64c extends in a direction inclined with respect to the vertical direction in the radial direction as viewed in the axial direction. The through portion 64c extends from an outer surface of the support portion 64 in a direction inclined obliquely forward downward, for example.

The through portion 64c has an inner groove portion 64f and an outer groove portion 64g. The inner groove 64f is provided in a radially inner portion of the support 64. The inner groove 64f is provided on the stepped surface 64i. The outer groove 64g is provided in a radially outer portion of the support 64. The outer groove 64g penetrates the large diameter portion 64b in the axial direction and is provided to the small diameter portion 64a. The outer groove 64g is connected to the radially outer side of the inner groove 64 f. The groove bottom surface of the outer groove 64g is an inclined surface 64e. As shown in fig. 4 and 6, the inclined surface 64e is located on the right side from the radially outer side toward the radially inner side. The radially inner end of the inclined surface 64e is connected to the radially outer end of the groove bottom surface of the inner groove 64 f. The inclined surface 64e is provided in the small diameter portion 64a. The inclined surface 64e is located on the left side of the first bearing 26.

A plurality of radial ribs 65 protrude rightward from the partition 63. The radial ribs 65 have a projection height smaller than that of the support portions 64. That is, the right end of the radial rib 65 is located on the left side of the right end of the support 64. As shown in fig. 4 and 5, the radial rib 65 extends radially outward from the outer side surface of the support portion 64. The plurality of radial ribs 65 are arranged at intervals in the circumferential direction. The radial rib 65 extending upward from the outer side of the support portion 64 among the radial ribs 65 is connected to the wall portion 61c located on the upper side among the wall portions of the motor housing portion 61.

The first rib 66 protrudes radially outward from the outer side surface of the support portion 64. In the present embodiment, the first rib 66 protrudes upward from an upper portion of the outer side surfaces of the support portions 64. More specifically, the first rib 66 protrudes obliquely upward and rearward. As shown in fig. 5, the inclination with respect to the vertical direction of the direction in which the first rib 66 protrudes radially outward is smaller than the inclination with respect to the vertical direction of the direction in which the through portion 64c extends, as viewed in the axial direction. The radially outer end of the first rib 66 is located radially inward of the radially outer end of the radial rib 65. The first rib 66 protrudes radially outward from an outer peripheral surface of a portion of the support portion 64 located above and forward of the portion where the through portion 64c is provided. The first rib 66 is disposed at a position separated from the through portion 64c in the circumferential direction.

As shown in fig. 4 and 6, the first rib 66 extends in the axial direction. The right end of the first rib 66 is located at the right end of the support 64. The left end of the first rib 66 is connected to a radially inner end of one radial rib 65 of the plurality of radial ribs 65. At least a portion of the first rib 66 is inserted inside the first coil end 33a. Thus, the partition wall 63 can be made closer to the first coil end 33a in the axial direction than in the case where the first rib 66 is not inserted inside the first coil end 33a. Therefore, the drive device 1 is easily miniaturized in the axial direction. As shown in fig. 6, in the present embodiment, the right-side end of the first rib 66 is inserted inside the first coil end 33a.

As shown in fig. 4 and 5, the second rib 67 protrudes radially outward from the peripheral edge portion of the through portion 64c in the outer surface of the support portion 64. More specifically, the second rib 67 protrudes radially outward from a rear portion of the peripheral edge portion of the through portion 64 c. The second rib 67 protrudes obliquely rearward, for example, upward. The inclination of the second rib 67 with respect to the vertical direction in the direction in which the second rib 67 protrudes radially outward is larger than the inclination of the through portion 64c with respect to the vertical direction in the direction in which the first rib 66 protrudes. The radially outer end of the second rib 67 is located radially inward of the radially outer end of the radial rib 65. The radial position of the radially outer end of the first rib 66 and the radial position of the radially outer end of the second rib 67 are, for example, identical to each other.

In the present embodiment, the second rib 67 protrudes radially outward from the outer peripheral surface of a portion of the support portion 64 located below and rearward of the portion where the first rib 66 is provided. The second rib 67 is disposed at a rear side of the first rib 66 so as to be circumferentially spaced apart. In the present embodiment, the circumferential position of the through portion 64c is between the circumferential position of the first rib 66 and the circumferential position of the second rib 67. In other words, the through portion 64c is provided in a portion of the support portion 64 between the portion provided with the first rib 66 and the circumferential direction of the portion provided with the second rib 67.

As shown in fig. 4, the second rib 67 extends in the axial direction. The right end of the second rib 67 is located at the right end of the support 64. The left end of the second rib 67 is connected to a radially inner end of one radial rib 65 of the plurality of radial ribs 65. The radial rib 65 connected to the second rib 67 is a different radial rib 65 from the radial rib 65 connected to the first rib 66. The radial rib 65 connected to the second rib 67 is located on the rear side of the radial rib 65 connected to the first rib 66, and the radial ribs 65 connected to the first rib 66 are adjacently arranged at intervals in the circumferential direction.

At least a portion of the second rib 67 is inserted inside the first coil end 33 a. In more detail, the right end of the second rib 67 is inserted inside the first coil end 33 a. The surface of the second rib 67 on the side opposite to the first rib 66 is smoothly continuous with the circumferential side surface of the outer groove 64g of the through portion 64 c. In the present embodiment, the surface on the side opposite to the first rib 66 of the circumferential both side surfaces of the second rib 67 is a surface inclined forward toward the upper side.

In the present embodiment, the housing 6 has an oil passage portion 68 and a guide portion 69. That is, the driving device 1 includes the oil passage portion 68 and the guide portion 69. In the present embodiment, the oil passage portion 68 is constituted by the through portion 64c and the second rib 67. That is, the oil passage portion 68 has the through portion 64c and the second rib 67. The oil path portion 68 extends from the outside of the support portion 64 to the inside of the support portion 64. As shown in fig. 5, in the present embodiment, the oil passage portion 68 extends in a direction inclined with respect to the vertical direction as viewed in the axial direction of the motor axis J1. In the present embodiment, the oil passage portion 68 extends in a direction that is located forward (+x direction) of the vehicle as it goes downward. The oil passage portion 68 has an upper opening portion 68a that opens on the outside and upper side of the support portion 64. In the present embodiment, the edge of the upper opening 68a is formed by the upper end of the through portion 64c and the upper end of the second rib 67.

The inner side surface of the oil passage portion 68 includes the inner side surface of the through portion 64 c. That is, the inner surface of the oil passage portion 68 has an inclined surface 64e of the outer groove portion 64 g. As shown in fig. 6, the inclined surface 64e is located on the right side as it goes radially inward from the upper opening portion 68a. The inclined surface 64e approaches the first bearing 26 as it goes from the upper opening portion 68a toward the inside of the support portion 64. In the present embodiment, the inner surface of the oil passage portion 68 is constituted by the inner surface of the through portion 64c and the circumferential side surface of the second rib 67.

As shown in fig. 5, the guide portion 69 guides the oil O to the oil passage portion 68. The guide portion 69 is located around the upper opening portion 68 a. The guide portion 69 is provided adjacent to the front side of the upper opening portion 68a, for example. In the present embodiment, the guide portion 69 is constituted by the connecting portion 64d and the first rib 66. That is, the guide portion 69 has the connecting portion 64d and the first rib 66.

The connection portion 64d is a portion of the outer side surface of the support portion 64 that connects the upper opening portion 68a and the first rib 66. The connection portion 64d is a peripheral edge portion of the through portion 64c in the outer side surface of the support portion 64, and is a front side portion of the peripheral edge portion of the through portion 64 c. The connecting portion 64d is located between the first rib 66 and the circumferential direction of the through portion 64 c. In the present embodiment, the connection portion 64d is located on the lower side from the first rib 66 toward the upper opening portion 68 a. The connection portion 64d is, for example, an arc-shaped surface centered on the motor shaft J1.

As shown in fig. 7, the housing 6 has a support portion 164 and an oil path portion 168. The support portion 164 protrudes leftward from a wall portion 61b covering the right side of the rotor 20 and the stator 30 among the wall portions of the motor housing portion 61. The support portion 164 supports the second bearing 27. The support portion 164 has the same structure as the support portion 64, except for the points where the support portion is provided at a different position and symmetrically arranged in the axial direction, for example. The oil passage portion 168 is provided in the support portion 164. The oil passage portion 168 has the same structure as the oil passage portion 68, except for points that are disposed at different positions and are disposed symmetrically in the axial direction, for example. Although not shown, the support portion 164 is provided with a guide portion for guiding the oil O to the oil passage portion 168, for example, in the same manner as the support portion 64.

The motor 2 of the motor 2 is an inner rotor type motor. The motor 2 has a rotor 20, a stator 30 and bearings 26, 27. The rotor 20 is rotatable about a motor shaft J1 extending in the horizontal direction. The rotor 20 has a shaft body 21 and a rotor body 24. Although not shown, the rotor body 24 includes a rotor core and a rotor magnet fixed to the rotor core. The torque of the rotor 20 is transmitted to the transmission 3.

The shaft body 21 extends in the axial direction about the motor shaft J1. The shaft body 21 rotates about the motor shaft J1. The shaft 21 is a hollow shaft having a hollow portion 22 formed therein. The shaft body 21 is provided with a communication hole 23. The communication hole 23 extends in the radial direction and connects the hollow portion 22 and the outside of the shaft body 21.

The shaft body 21 extends across the motor housing 61 and the gear housing 62 of the housing 6. The left end of the shaft 21 protrudes into the gear housing 62. A first gear 41 described later of the transmission device 3 is fixed to the left end of the shaft 21. The shaft body 21 is rotatably supported by a first bearing 26 and a second bearing 27.

The stator 30 and the rotor 20 are opposed to each other with a gap therebetween in the radial direction. In more detail, the stator 30 is located radially outside the rotor 20. The stator 30 has a stator core 32 and a coil assembly 31. The stator core 32 surrounds the rotor 20. The stator core 32 is fixed to the inner peripheral surface of the motor housing 61. As shown in fig. 2 and 3, the stator core 32 includes a stator core main body 32a and a fixing portion 32b. Although not shown, the stator core main body 32a has a cylindrical core back extending in the axial direction and a plurality of teeth extending radially inward from the core back. The plurality of teeth are arranged at equal intervals throughout the circumference in the circumferential direction.

As shown in fig. 2, the fixing portion 32b protrudes radially outward from the outer peripheral surface of the stator core main body 32 a. The fixing portion 32b is a portion fixed to the housing 6. The fixing portions 32b are provided in plural at intervals along the circumferential direction. The fixing portions 32b are provided with four, for example. The four fixing portions 32b are arranged at equal intervals throughout the circumference.

One of the fixing portions 32b protrudes upward from the stator core main body 32 a. The other of the fixing portions 32b protrudes downward from the stator core main body 32 a. Still another one of the fixing portions 32b protrudes from the stator core main body 32a to the front side (+x side). The remaining one of the fixing portions 32b protrudes from the stator core main body 32a to the rear side (-X side).

The fixing portion 32b extends in the axial direction. The fixing portion 32b extends from, for example, an end portion on the left side (+y side) of the stator core main body 32a to an end portion on the right side (-Y side) of the stator core main body 32 a. The fixing portion 32b has a through hole 32c penetrating the fixing portion 32b in the axial direction. Though not shown, a bolt extending in the axial direction is inserted through the through hole 32c. The bolt is inserted through the through hole 32c from the right side (-Y side), for example, and screwed into an internal screw hole provided in the partition 63. Thereby, the fixing portion 32b is fixed to the partition 63. In this way, the stator 30 is fixed to the housing 6 by bolts.

The coil block 31 is mounted to the stator core 32. As shown in fig. 1, the coil assembly 31 has a plurality of coils 31a mounted to the stator core 32 in the circumferential direction. The plurality of coils 31a are attached to the teeth of the stator core 32 via insulation members, not shown. The plurality of coils 31a are arranged along the circumferential direction. More specifically, the plurality of coils 31a are arranged at equal intervals throughout the circumference. Although not shown, the coil assembly 31 may have a binding member for binding the coils 31a, or may have a jumper wire for connecting the coils 31a to each other.

The coil assembly 31 has coil ends 33 protruding in the axial direction from the stator core 32. In the present embodiment, the coil ends 33 include a first coil end 33a and a second coil end 33b. The first coil end 33a protrudes leftward from the stator core 32. The second coil end 33b protrudes rightward from the stator core 32. As shown in fig. 2, the first coil end 33a and the second coil end 33b are annular around the motor shaft J1. More specifically, the first coil end 33a and the second coil end 33b are annular with the motor shaft J1 as a center.

The first coil end 33a has a portion of the plurality of coils 31a protruding leftward from the stator core 32. The second coil end 33b has a portion of the plurality of coils 31a protruding rightward from the stator core 32. Although not shown, the first coil end 33a and the second coil end 33b may have a binding member for binding the coils 31a, or may have a jumper wire for connecting the coils 31a to each other.

As shown in fig. 1, the first bearing 26 and the second bearing 27 rotatably support the rotor 20. The first bearing 26 and the second bearing 27 are, for example, ball bearings. The first bearing 26 is a bearing that rotatably supports a portion of the rotor 20 located on the left side of the stator core 32. That is, the first bearing 26 rotatably supports the left side of the rotor 20. In the present embodiment, the first bearing 26 supports a portion of the shaft body 21 located on the left side of the portion to which the rotor main body 24 is fixed. The first bearing 26 is held by a support portion 64 provided in the partition 63.

The second bearing 27 is a bearing that rotatably supports a portion of the rotor 20 located on the right side of the stator core 32. That is, the second bearing 27 rotatably supports the right side of the rotor 20. In the present embodiment, the second bearing 27 supports a portion of the shaft body 21 located on the right side of the portion to which the rotor main body 24 is fixed.

The second bearing 27 is held by a support portion 164 provided in the wall portion 61 b.

The transmission device 3 is accommodated in the gear accommodating portion 62 of the housing 6. The transmission device 3 is connected to the motor 2. More specifically, the transmission device 3 is connected to the left end of the shaft 21. The transmission device 3 has a reduction device 4 and a differential device 5. The torque output from the motor 2 is transmitted to the differential 5 via the reduction gear 4.

The reduction gear 4 is connected to the motor 2. The reduction gear 4 reduces the rotational speed of the motor 2, and increases the torque output from the motor 2 in accordance with the reduction gear ratio. The reduction gear 4 transmits the torque output from the motor 2 to the differential gear 5. The reduction gear 4 has a first gear 41, a second gear 42, a third gear 43, and an intermediate shaft 45.

The first gear 41 is fixed to the outer peripheral surface of the left end portion of the shaft body 21. The first gear 41 rotates together with the shaft body 21 about the motor shaft J1. The intermediate shaft body 45 extends along an intermediate shaft J2 parallel to the motor shaft J1. The intermediate shaft body 45 rotates about the intermediate shaft J2. The second gear 42 and the third gear 43 are fixed to the outer peripheral surface of the intermediate shaft 45. The second gear 42 and the third gear 43 are connected via an intermediate shaft 45. The second gear 42 and the third gear 43 rotate around the intermediate shaft J2. The second gear 42 is meshed with the first gear 41. The third gear 43 meshes with a ring gear 51 of the differential device 5, which will be described later.

The torque output from the motor 2 is transmitted to the ring gear 51 of the differential device 5 via the shaft body 21, the first gear 41, the second gear 42, the intermediate shaft body 45, and the third gear 43 in this order. The gear ratio of each gear, the number of gears, and the like can be variously changed according to a desired reduction ratio. In the present embodiment, the reduction gear 4 is a parallel axis gear type reduction gear in which the axes of the gears are arranged in parallel.

The differential device 5 is connected to the motor 2 via the reduction device 4. The differential device 5 is a device for transmitting torque output from the motor 2 to wheels of the vehicle. The differential device 5 transmits the same torque to the axles 55 of the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle turns. As described above, in the present embodiment, the transmission device 3 transmits the torque of the motor 2 to the axle 55 of the vehicle via the reduction device 4 and the differential device 5. The differential device 5 has a ring gear 51, a gear housing not shown, a pair of pinion gears not shown, a pinion shaft body not shown, and a pair of side gears not shown. The ring gear 51 rotates about a differential axis J3 parallel to the motor axis J1. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4.

The motor 2 is provided with an oil passage 90 for circulating the oil O in the housing 6. The oil passage 90 is a path of the oil O that supplies the oil O from the oil sump P to the motor 2 and is redirected to the oil sump P. The oil passage 90 is provided across the inside of the motor housing 61 and the inside of the gear housing 62.

In the present specification, the "oil passage" refers to a path of oil. Therefore, the concept of the "oil passage" includes not only a "flow passage" for realizing a flow of oil in one direction constantly, but also a path for temporarily retaining oil and a path for dripping oil. The path for temporarily retaining the oil includes, for example, a reservoir for storing the oil.

The oil passage 90 has a first oil passage 91 and a second oil passage 92. The first oil passage 91 and the second oil passage 92 circulate the oil O in the casing 6, respectively. The first oil passage 91 includes a lift path 91a, a shaft supply path 91b, an in-shaft path 91c, and an in-rotor path 91d. In addition, a first reservoir 93 is provided in the path of the first oil passage 91. The first reservoir 93 is provided in the gear housing 62.

The lifting path 91a is a path for lifting the oil O from the oil sump P by rotation of the ring gear 51 of the differential device 5 and receiving the oil O in the first reservoir 93. The first reservoir 93 is opened upward. The first reservoir 93 receives oil O lifted by the ring gear 51. In addition, when the liquid surface S of the oil sump P is high immediately after the motor 2 is driven, the first reservoir 93 receives the oil O lifted up by the second gear 42 and the third gear 43 in addition to the ring gear 51.

The shaft body supply path 91b guides the oil O from the first reservoir 93 to the hollow portion 22 of the shaft body 21. The in-shaft path 91c is a path through which the oil O passes in the hollow portion 22 of the shaft 21. The rotor path 91d is a path through which the oil O passes from the communication hole 23 of the shaft body 21, through the inside of the rotor body 24, and is scattered to the stator 30.

In the in-shaft path 91c, a centrifugal force is applied to the oil O in the rotor 20 as the rotor 20 rotates. Thereby, the oil O continuously flies from the rotor 20 to the radial outside. In addition, as the oil O is scattered, the path inside the rotor 20 becomes negative pressure, the oil O stored in the first reservoir 93 is sucked into the rotor 20, and the path inside the rotor 20 is filled with the oil O.

The oil O reaching the stator 30 absorbs heat from the stator 30. The oil O that cools the stator 30 drops downward and is stored in a lower region in the motor housing 61. The oil O stored in the lower region of the motor housing 61 moves toward the gear housing 62 through the partition opening 63a provided in the partition 63. As described above, the first oil passage 91 supplies the oil O to the rotor 20 and the stator 30.

In the second oil passage 92, the oil O is extracted from the oil sump P and supplied to the stator 30. The second oil passage 92 is provided with an oil pump 96, a cooler 97, a first oil injection portion 11, and a second oil injection portion 12. The second oil passage 92 includes a first flow passage 92a, a second flow passage 92b, a third flow passage 92c, and an oil supply passage 94. Thus, the driving device 1 includes the oil supply passage 94.

The first flow path 92a, the second flow path 92b, and the third flow path 92c are provided in the wall portion of the housing 6. The first flow path 92a connects the oil sump P and the oil pump 96. The second flow path 92b connects the oil pump 96 and the cooler 97. The third flow path 92c connects the cooler 97 and the oil supply path 94. The third flow passage 92c is provided in, for example, a front wall portion of the wall portions of the motor housing 61.

In the present embodiment, the oil supply passage 94 is provided in the partition 63. Namely, the housing 6 has the oil supply passage 94. The oil supply passage 94 connects the first oil injection portion 11 and the second oil injection portion 12. That is, the oil supply path 94 is connected to both the first oil injection portion 11 and the second oil injection portion 12. As shown in fig. 8, in the present embodiment, the oil supply path 94 has a first extension 94a, a second extension 94b, and a connection 94c. The first extension 94a extends upward from the end of the third flow path 92 c. The end of the third flow path 92c is located below and forward of the motor shaft J1. The first extension 94a passes through the front side of the motor shaft J1, and extends from a position lower than the motor shaft J1 to a position upper than the motor shaft J1. The first extension 94a extends linearly and obliquely in the front-rear direction with respect to the vertical direction, for example. The first extension 94a is located at the rear side, for example, as it goes toward the upper side. The upper end of the first extension 94a is located above the shaft 21. A connection portion 94c is provided at an upper end of the first extension portion 94 a.

The second extension 94b is connected to an upper end of the first extension 94a via a connection 94 c. The second extension 94b extends rearward from the connection 94 c. The second extension 94b extends linearly, for example, parallel to the front-rear direction. The second extension 94b is located above the motor shaft J1. The second extension 94b is located above the shaft body 21. The second extension 94b extends from a position on the front side of the motor shaft J1 to a position on the rear side of the motor shaft J1.

A hole portion 94d connected to the first oil ejection portion 11 and a hole portion 94e connected to the second oil ejection portion 12 are provided at a portion on the right side (-Y side) in the inner surface of the second extension portion 94 b. Thereby, the second extension 94b is connected to both the first oil ejecting portion 11 and the second oil ejecting portion 12. The hole 94d is located on the rear side of the motor shaft J1. The hole 94e is located on the front side of the motor shaft J1.

As shown in fig. 6, the hole 94d opens in the motor housing 61. The hole 94d has a small-diameter hole 94f and a large-diameter hole 94g. The small-diameter hole portion 94f opens in the second extension portion 94 b. The large diameter hole 94g is connected to the right side of the small diameter hole 94 f. The large-diameter hole 94g opens into the motor housing 61. The large diameter hole 94g has an inner diameter larger than that of the small diameter hole 94 f. The large-diameter hole 94g is formed by a cylindrical portion 63b protruding from the partition 63 into the motor housing 61, for example. The inside of the large-diameter hole 94g is the inside of the cylindrical portion 63 b. Although not shown, the hole 94e has a small-diameter hole and a large-diameter hole, and is open in the motor housing 61, similarly to the hole 94 d.

As shown in fig. 8, the flow passage area of the first extension 94a and the flow passage area of the second extension 94b are, for example, the same as each other. The flow passage area of the connection portion 94c is larger than the flow passage area of the first extension portion 94a and the flow passage area of the second extension portion 94b. The oil O in the third flow passage 92c flows into the lower end portion of the first extension 94 a. The oil O flowing into the first extension 94a flows upward along the first extension 94a, and flows into the second extension 94b via the connection 94 c. The oil O flowing into the second extension 94b flows rearward and flows into the first oil injection part 11 and the second oil injection part 12 through the holes 94d and 94 e. The hole 94d and the first oil jet part 11 are located downstream of the hole 94e and the second oil jet part 12 in the flow direction of the oil O in the second extension part 94b.

As shown in fig. 1, the first oil jet part 11 and the second oil jet part 12 are housed inside the casing 6. As shown in fig. 2, in the present embodiment, the first oil injection portion 11 and the second oil injection portion 12 are pipes extending in the axial direction. The first oil jet portion 11 and the second oil jet portion 12 are, for example, cylindrical in shape extending in a straight line in the axial direction.

In the present specification, "the first oil injection portion and the second oil injection portion extend linearly in the axial direction of the motor shaft" includes a case where the first oil injection portion and the second oil injection portion extend substantially linearly in the axial direction, as well as a case where the first oil injection portion and the second oil injection portion extend strictly linearly in the axial direction. That is, in the present embodiment, the "first oil injection portion 11 and the second oil injection portion 12 extend linearly in the axial direction", for example, the first oil injection portion 11 and the second oil injection portion 12 may extend slightly inclined with respect to the axial direction. In this case, the direction in which the first oil jet part 11 is inclined with respect to the axial direction and the direction in which the second oil jet part 12 is inclined with respect to the axial direction may be the same or different.

In the present embodiment, the first oil ejection portion 11 and the second oil ejection portion 12 extend in parallel directions to each other. The first oil jet portion 11 and the second oil jet portion 12 are circumferentially spaced apart from each other on the radially outer side of the stator 30. In the present embodiment, the first oil jet part 11 and the second oil jet part 12 are located on the vertical direction upper side of the stator 30.

In addition, in this specification, "a certain object is located on a predetermined direction side of another object" includes the following cases: when the driving device is arranged in a horizontal plane and the object and the other object are viewed from the predetermined direction side, the object and the other object overlap each other, and the object is positioned on the front side of the other object. That is, as shown in fig. 3, in the present embodiment, when the first oil jet part 11, the second oil jet part 12, and the stator 30 are viewed from the vertical upper side in a state in which the driving device 1 is disposed on the horizontal plane, the first oil jet part 11, the second oil jet part 12, and the stator 30 overlap each other, and the first oil jet part 11 and the second oil jet part 12 are located on the front side than the stator 30. In the present specification, the term "state in which the driving device is disposed on the horizontal surface" includes a case in which the vehicle on which the driving device is mounted is disposed on the horizontal road surface.

In the present embodiment, the first oil jet portion 11 and the second oil jet portion 12 are arranged so as to sandwich the motor shaft J1 as viewed in the vertical direction. The first oil jet portion 11 is located on the rear side of the motor shaft J1. The second oil jet portion 12 is located on the front side of the motor shaft J1. The first oil jet portion 11 and the second oil jet portion 12 are disposed, for example, in the front-rear direction and the circumferential direction with a fixing portion 32b protruding upward from the stator core main body 32a interposed therebetween.

As shown in fig. 5, the vertical position of the first oil jet portion 11 and the vertical position of the second oil jet portion 12 are identical to each other, for example. The radial position of the first oil ejection portion 11 and the radial position of the second oil ejection portion 12 are, for example, identical to each other. In the present embodiment, the first oil jet part 11 and the second oil jet part 12 are disposed with the center line CL therebetween as viewed in the axial direction. The center line CL is a virtual line extending in the vertical direction through the motor axis J1 as viewed in the axial direction. The center line CL extends parallel to the vertical direction. The first oil injection portion 11 and the second oil injection portion 12 are arranged line symmetrically with respect to the center line CL as viewed in the axial direction.

As shown in fig. 2, the left end of the first oil ejecting portion 11 and the left end of the second oil ejecting portion 12 are open. The right end of the first oil ejecting portion 11 and the right end of the second oil ejecting portion 12 are closed. As shown in fig. 3, the axial dimension of the second oil ejection portion 12 is, for example, larger than the axial dimension of the first oil ejection portion 11. The axial position of the left end of the first oil ejection portion 11 and the axial position of the left end of the second oil ejection portion 12 are, for example, identical to each other. The right end of the second oil jet part 12 is located, for example, on the right side of the right end of the first oil jet part 11.

As shown in fig. 1, the left end of the first oil injection portion 11 and the left end of the second oil injection portion 12 are fixed to the partition wall 63. As shown in fig. 6, the left end of the first oil jet portion 11 is fixed to the partition wall 63 by being inserted into a hole 94d provided in the partition wall 63, for example. More specifically, the left end of the first oil jet portion 11 is inserted into the large-diameter hole 94g, which is the inner side of the cylindrical portion 63 b. The left end of the second oil jet portion 12 is fixed to the partition wall 63 by being inserted into a hole 94e provided in the partition wall 63, for example. The right end of the first oil ejecting portion 11 and the right end of the second oil ejecting portion 12 are fixed to an upper wall portion 61c of the wall portions of the motor housing portion 61 via, for example, a mounting portion not shown. In this way, the first oil jet part 11 and the second oil jet part 12 are fixed to the housing 6.

Here, the hole 94e is located upstream of the hole 94d in the flow direction of the oil O in the second extension 94b of the oil supply passage 94. Thus, the portion of the oil supply passage 94 to which the second oil injection portion 12 is connected is located on the upstream side in the flow direction of the oil O in the oil supply passage 94 than the portion of the oil supply passage 94 to which the first oil injection portion 11 is connected.

In the present embodiment, the inner diameter of the first oil injection part 11 and the inner diameter of the second oil injection part 12 are the same as each other. That is, the flow area of the first oil injection part 11 and the flow area of the second oil injection part 12 are the same as each other. In the present embodiment, the flow path area of the first oil ejection portion 11 is the area of the inside of the first oil ejection portion 11 in a cross section orthogonal to the axial direction. In the present embodiment, the flow path area of the second oil jet part 12 is the area of the inside of the second oil jet part 12 in a cross section orthogonal to the axial direction.

In the present specification, "the parameters are identical to each other" includes a case where the parameters are substantially identical to each other, in addition to a case where the parameters are strictly identical to each other. That is, for example, "the flow area of the first oil injection part 11 and the flow area of the second oil injection part 12 are the same as each other" also includes a case where the flow area of the first oil injection part 11 and the flow area of the second oil injection part 12 are substantially the same as each other. "certain parameters are substantially identical to each other" includes, for example, a case where certain parameters are slightly deviated from each other within a range of tolerance.

As shown in fig. 5, in the present embodiment, the first oil jet portion 11 is disposed inside a recess 61d provided in the wall portion 61 c. The second oil jet portion 12 is disposed inside a recess 61e provided in the wall portion 61 c. The concave portion 61d and the concave portion 61e are recessed upward. The concave portion 61d and the concave portion 61e are arranged apart in the front-rear direction. Each oil ejecting portion is disposed inside each concave portion, and a partition wall portion 61f as a part of the wall portion 61c is provided between the first oil ejecting portion 11 and the second oil ejecting portion 12 in the front-rear direction. The first oil jet portion 11 is disposed apart from the inner surface of the recess 61 d. The second oil jet portion 12 is disposed apart from the inner surface of the recess 61 e.

As shown in fig. 3, the first oil ejection portion 11 has ejection ports 13a, 14a and a first supply port 15a. The second oil ejection portion 12 has ejection ports 13b, 14b and a second supply port 15b. The injection ports 13a, 14a and the first supply port 15a are provided on the outer side surface of the first oil injection portion 11. The injection ports 13b, 14b and the second supply port 15b are provided on the outer side surface of the second oil injection portion 12. Each of the injection ports and each of the supply ports are, for example, circular. In the present embodiment, the first supply port 15a corresponds to a first injection port, and the injection ports 13a and 14a correspond to a second injection port.

The oil O supplied from the oil supply passage 94 to the inside of the first oil injection portion 11 and the inside of the second oil injection portion 12 is injected from the injection ports and the supply ports provided in the first oil injection portion 11 and the second oil injection portion 12. The injection ports 13a, 13b, 14a, 14b inject the oil O toward the stator 30. The first supply port 15a supplies the oil O to the first bearing 26. The second supply port 15b supplies the oil O to the second bearing 27.

The first oil ejecting portion 11 is not provided with a supply port for supplying the oil O to the second bearing 27. The second oil jet portion 12 is not provided with a supply port for supplying the oil O to the first bearing 26. That is, of the first oil injection portion 11 and the second oil injection portion 12, only the first oil injection portion 11 has a supply port for supplying the oil O to the first bearing 26. In the first oil ejecting portion 11 and the second oil ejecting portion 12, only the second oil ejecting portion 12 has a supply port for supplying the oil O to the second bearing 27.

In the present embodiment, the injection ports and the supply ports provided in the first oil injection portion 11 and the second oil injection portion 12 are openings that are open to the outer surface of each oil injection portion, among openings of through holes that penetrate the wall of each oil injection portion from the inner surface to the outer surface.

Specifically, as shown in fig. 5, the first supply port 15a is an opening portion that opens to the outer surface of the first oil jet portion 11, of opening portions of the first through hole 16a that penetrates the wall portion of the first oil jet portion 11 from the inner surface to the outer surface. Thus, the first oil jet portion 11 has the first through hole 16a. As shown in fig. 7, the second supply port 15b is an opening portion that opens to the outer surface of the second oil jet portion 12, of opening portions of the second through-hole 16b that penetrates the wall portion of the second oil jet portion 12 from the inner surface to the outer surface. Thus, the second oil jet portion 12 has the second through hole 16b. By forming the first through-hole 16a and the second through-hole 16b, the first supply port 15a and the second supply port 15b can be easily formed. The first through hole 16a extends in a radial direction centering on the central axis of the first oil ejecting portion 11. The second through hole 16b extends in a radial direction centered on the central axis of the second oil ejection portion 12.

As shown in fig. 6, the axial position of the first through hole 16a is the same as the axial position of a part of the first bearing 26. The axial position of the first through hole 16a is the same as that of the left end of the first bearing 26, for example. As shown in fig. 7, the second through hole 16b is located on the left side of the second bearing 27. As shown in fig. 6 and 7, the opening area of the opening 17a of the opening of the first through hole 16a that opens to the inner side surface of the first oil ejecting portion 11 and the opening area of the opening 17b of the opening of the second through hole 16b that opens to the inner side surface of the second oil ejecting portion 12 are, for example, the same as each other.

As shown in fig. 7, the inner surface of the second through hole 16b has an extension surface 16c and an inclined surface 16d. In the present embodiment, the extension surface 16c and the inclined surface 16d are right-side portions of the inner side surfaces of the second through holes 16 b. That is, the extension surface 16c and the inclined surface 16d are directed to the left.

The extension surface 16c extends from the inner side surface of the second oil ejecting portion 12 in the second direction D2 orthogonal to the axial direction. In the present embodiment, the second direction D2 is a direction inclined in the front-rear direction with respect to the vertical direction. The extension surface 16c extends obliquely downward and rearward from the inner side surface of the second oil jet part 12, for example. That is, the second direction D2 is a direction toward the rear side as it goes toward the lower side. The extension surface 16c is, for example, a curved surface.

In the present embodiment, the inclined surface 16d of the second through hole 16b extends from the front end portion of the extending surface 16c of the second through hole 16b to the outer side surface of the second oil ejecting portion 12. In the present embodiment, the front end of the extension surface 16c is the lower end of the extension surface 16 c. The inclined surface 16D extends in a direction inclined in the axial direction with respect to the second direction D2. The inclined surface 16D is located on the right side as it faces the outer side surface of the second oil ejection portion 12 in the second direction D2. Here, the second through hole 16b is located on the left side of the second bearing 27. Therefore, the inclined surface 16d approaches the second bearing 27 as it faces the outer side surface of the second oil ejection portion 12. The inclined surface 16d is, for example, a curved surface. The inclined surface 16d is, for example, a part of a tapered surface having an inner diameter that increases toward the outer surface of the second oil jet part 12.

As shown in fig. 9, in the third direction D3 orthogonal to both the axial direction and the second direction D2, the maximum width of the inclined surface 16D is, for example, equal to or smaller than the maximum width of the extension surface 16 c. In the present embodiment, the maximum width of the inclined surface 16d and the maximum width of the extension surface 16c are the same as each other. The maximum width of the inclined surface 16D in the third direction D3 is, for example, the same as the inner diameter of the opening 17b that opens to the inner side surface of the second oil ejecting portion 12, out of the openings of the second through holes 16 b. At the right side portion of the inclined surface 16D, the width of the third direction D3 of the inclined surface 16D becomes smaller toward the right side. The outer edge of the right side portion of the inclined surface 16D is formed in an arc shape protruding rightward as viewed in the second direction D2.

As shown in fig. 3, the injection ports 13a and 13b are located on the upper side of the stator core 32. More specifically, the injection ports 13a and 13b are located above the stator core main body 32 a. The injection ports 13a and 13b are symmetrically arranged with respect to the motor axis J1 as viewed in the vertical direction. The oil O injected from the injection ports 13a and 13b is supplied to the stator core 32. The injection ports 13a and 13b are provided in plural at intervals in the axial direction. The injection ports 13a and 13b are provided with four, for example, respectively. The opening area of the ejection port 13a and the opening area of the ejection port 13b are, for example, the same as each other.

The ejection ports 14a and 14b are located above the coil ends 33. For example, two injection ports 14a and 14b are provided. One of the two injection ports 14a is located on the left side of the plurality of injection ports 13a in the first oil injection portion 11, and is located on the upper side of the first coil end 33 a. The other of the two injection ports 14a is located on the right side of the plurality of injection ports 13a in the first oil injection portion 11, and is located on the upper side of the second coil end 33 b. One of the two injection ports 14b is located on the left side of the plurality of injection ports 13b in the second oil injection portion 12, and is located on the upper side of the first coil end 33 a. The other of the two injection ports 14b is located on the right side of the plurality of injection ports 13b in the second oil injection portion 12, and is located on the upper side of the second coil end 33 b.

The injection ports 14a and 14b located above the first coil end 33a are symmetrically arranged with respect to the motor axis J1 as viewed in the vertical direction. The injection ports 14a and 14b located above the second coil end 33b are symmetrically arranged with respect to the motor axis J1 as viewed in the vertical direction. The oil O ejected from the ejection ports 14a and 14b is supplied to the respective coil ends 33. The opening area of the ejection port 14a and the opening area of the ejection port 14b are, for example, the same as each other. The opening areas of the ejection openings 14a, 14b and the opening areas of the ejection openings 13a, 13b are, for example, identical to each other.

In the first oil ejection portion 11, the first supply port 15a is located on the left side of the ejection port 14a located on the upper side of the first coil end 33 a. That is, the first supply port 15a is located on the left side of the injection ports 13a, 14 a. The axial distance from the left end of the first oil injection portion 11 connected to the oil supply passage 94 to the first supply port 15a is smaller than the axial distance from the left end of the first oil injection portion 11 to the injection ports 13a, 14 a. Thus, the first supply port 15a is located upstream of the injection ports 13a and 14a in the flow direction of the oil O flowing in the first oil injection portion 11.

The first supply port 15a is provided at the left end of the first oil jet part 11, for example. The first supply port 15a is located on the left side of the first coil end 33 a. In the present embodiment, the first supply port 15a is located on the upper side of the first bearing 26. As shown in fig. 5, in the present embodiment, the first supply port 15a opens in a direction inclined in the front-rear direction with respect to the vertical direction as viewed in the axial direction. More specifically, the first supply port 15a opens obliquely downward and forward. The first supply port 15a is opened in a direction substantially toward the motor shaft J1, that is, radially inward. In addition, in the present specification, "the orientation of the supply port opening" includes an orientation along a normal line passing through the center of the supply port and perpendicular with respect to the center of the supply port. In addition, in the present specification, the "orientation of the ejection opening" includes an orientation along a normal line passing through the center of the ejection opening and perpendicular with respect to the center of the ejection opening.

The first supply port 15a opens to the guide 69. In the present embodiment, the first supply port 15a opens to the connection portion 64 d. That is, the first supply port 15a is opened to a part of the outer surface of the support portion 64. The first supply port 15a overlaps the oil passage portion 68 as viewed in the vertical direction. The first supply port 15a is located above the upper opening 68 a. In the present embodiment, the first supply port 15a is located on the upper side of the second rib 67. More specifically, the first supply port 15a is located on the upper side of the circumferential side surface of the second rib 67, which constitutes a part of the inner side surface of the oil passage portion 68. The opening area of the first supply port 15a is, for example, the same as the opening areas of the ejection ports 13a, 13b, 14a, 14 b.

As shown in fig. 6, a part of the first supply port 15a is covered with a cylindrical portion 63b into which the left end portion of the first oil ejection portion 11 is inserted. In the present embodiment, the left end of the first supply port 15a is covered with the right end of the cylindrical portion 63 b. That is, in the present embodiment, the right end of the cylindrical portion 63b is a coating portion 63c that covers a part of the first supply port 15 a. Thus, in the present embodiment, the case 6 has the coating portion 63c. The coating portion 63c covers a part of the first supply port 15a with the inner surface. The inner surface of the coating portion 63c is the inner surface of the large-diameter hole portion 94 g. In the present embodiment, the coating portion 63c closes a part of the first supply port 15 a.

As shown in fig. 5, the oil O ejected from the first supply port 15a is blown to the guide portion 69, and is guided to the oil passage portion 68 by the guide portion 69. Thereby, the oil O guided to the oil passage portion 68 flows to the inside of the support portion 64 via the oil passage portion 68. Thereby, the oil O injected from the first supply port 15a to the outer surface of the support portion 64 is supplied to the first bearing 26 disposed inside the support portion 64.

As shown in fig. 3, in the second oil ejecting portion 12, the second supply port 15b is located on the right side of the ejection port 14b located on the upper side of the second coil end 33 b. The second supply port 15b is provided at the right end of the second oil jet section 12, for example. The second supply port 15b is located on the right side of the second coil end 33 b. In the present embodiment, the second supply port 15b is located slightly to the left of the second bearing 27. The axial position of the second supply port 15b is between the axial position of the second coil end 33b and the axial position of the second bearing 27.

The axial distance from the left end of the second oil injection portion 12 connected to the oil supply passage 94 to the second supply port 15b is greater than the axial distance from the left end of the first oil injection portion 11 connected to the oil supply passage 94 to the first supply port 15 a. In the present embodiment, the axial distance from the left end of the second oil injection portion 12 connected to the oil supply passage 94 to the second supply port 15b is the flow path length from the oil supply passage 94 to the second supply port 15 b. In the present embodiment, the axial distance from the left end of the first oil injection portion 11 connected to the oil supply passage 94 to the first supply port 15a is the flow path length from the oil supply passage 94 to the first supply port 15 a. That is, the flow path length from the oil supply path 94 to the second supply port 15b is longer than the flow path length from the oil supply path 94 to the first supply port 15 a.

Although not shown, in the present embodiment, the second supply port 15b opens in a direction inclined in the front-rear direction with respect to the vertical direction as viewed in the axial direction. More specifically, the second supply port 15b opens obliquely downward and rearward. The second supply port 15b is opened in a direction substantially toward the motor shaft J1, that is, radially inward. As shown in fig. 7, since the inclined surface 16d is provided, the opening area of the second supply port 15b is larger than the opening area of the opening 17 b. In the present embodiment, the opening area of the second supply port 15b is larger than the opening area of the first supply port 15 a.

The oil O ejected from the second supply port 15b is ejected along the inclined surface 16d in a direction inclined to the right and rear sides with respect to the direction directed directly downward. The oil O ejected from the second supply port 15b flows to the inside of the support portion 164 via the oil passage portion 168. Thereby, the oil O ejected from the second supply port 15b is supplied to the second bearing 27 disposed inside the support portion 164.

As described above, the first oil injection portion 11 and the second oil injection portion 12 inject the oil O as the refrigerant to the stator 30 through the injection ports. As a result, the oil O can be supplied from the first oil injection portion 11 and the second oil injection portion 12 to the stator 30, and the stator 30 can be cooled. More specifically, the oil O can be supplied from the first oil injection portion 11 and the second oil injection portion 12 to the stator core 32, the first coil end 33a, and the second coil end 33b, and the stator core 32, the first coil end 33a, and the second coil end 33b can be cooled. The first oil jet portion 11 supplies the oil O to the first bearing 26 through the first supply port 15a, and the second oil jet portion 12 supplies the oil O to the second bearing 27 through the second supply port 15 b. This allows the oil O to be supplied as lubricating oil to the first bearing 26 and the second bearing 27.

The oil O supplied from the first oil jet part 11 and the second oil jet part 12 to the stator 30 drops downward and is stored in a lower region in the motor housing part 61. The oil O supplied to the first bearing 26 and the second bearing 27 may drop downward and be stored in a lower region in the motor housing 61. The oil O stored in the lower region of the motor housing 61 moves to the oil sump P of the gear housing 62 through the partition opening 63a provided in the partition 63. As described above, the second oil passage 92 supplies the oil O to the stator 30, the first bearing 26, and the second bearing 27.

The oil pump 96 shown in fig. 1 is a pump that delivers oil O as a refrigerant. In the present embodiment, the oil pump 96 is an electric pump driven by electric power. The oil pump 96 extracts the oil O from the oil sump P via the first flow path 92a, and supplies the oil O to the motor 2 via the second flow path 92b, the cooler 97, the third flow path 92c, the oil supply path 94, and the respective oil injection portions of the first oil injection portion 11 and the second oil injection portion 12.

The cooler 97 shown in fig. 1 cools the oil O passing through the second oil passage 92. The second flow path 92b and the third flow path 92c are connected to the cooler 97. The second flow path 92b and the third flow path 92c are connected to each other via an internal flow path of the cooler 97. A cooling water pipe 98 for passing cooling water cooled by a radiator, not shown, is connected to the cooler 97. The oil O passing through the cooler 97 is cooled by exchanging heat with the cooling water passing through the cooling water pipe 98.

According to the present embodiment, the first oil jet part 11 has a first supply port 15a for supplying the oil O to the first bearing 26, and the second oil jet part 12 has a second supply port 15b for supplying the oil O to the second bearing 27. That is, the supply port for supplying the oil O to the first bearing 26 and the supply port for supplying the oil O to the second bearing 27 are provided in different oil ejecting portions. Therefore, the number of openings provided in the first oil jet part 11 can be reduced as compared with a case where both the supply port for supplying the oil O to the first bearing 26 and the supply port for supplying the oil O to the second bearing 27 are provided in the first oil jet part 11. In addition, the number of openings provided in the second oil jet part 12 can be reduced as compared with a case where both the supply port for supplying the oil O to the first bearing 26 and the supply port for supplying the oil O to the second bearing 27 are provided in the second oil jet part 12. This can suppress a decrease in pressure in the first oil injection portion 11 and in pressure in the second oil injection portion 12. Therefore, the oil O can be supplied to the first bearing 26 and the second bearing 27 by the respective oil ejection portions, and the potential of the oil O ejected from the ejection ports 13a, 13b, 14a, and 14b to the stator 30 can be suppressed from decreasing.

In addition, according to the present embodiment, the portion of the oil supply passage 94 to which the second oil injection portion 12 is connected is located on the upstream side in the flow direction of the oil O in the oil supply passage 94 than the portion of the oil supply passage 94 to which the first oil injection portion 11 is connected. The flow path length from the oil supply path 94 to the second supply port 15b is longer than the flow path length from the oil supply path 94 to the first supply port 15 a. Therefore, the oil O flowing into the first oil injection portion 11 can be injected from the first supply port 15a closer to the oil supply passage 94 than the oil O flowing into the second oil injection portion 12 from the oil supply passage 94. Further, the oil O flowing into the second oil injection portion 12 earlier than the oil O flowing into the first oil injection portion 11 from the oil supply passage 94 can be injected from the second supply port 15b distant from the oil supply passage 94. Thus, the path length of the oil O from the inflow oil feed passage 94 to the first supply port 15a and the path length of the oil O from the inflow oil feed passage 94 to the second supply port 15b are easily made to be the same. Therefore, the potential of the oil O ejected from the first supply port 15a and the potential of the oil O ejected from the second supply port 15b are easily equalized. Therefore, the oil O is easily and uniformly supplied to each bearing.

In addition, according to the present embodiment, the opening area of the opening 17a of the opening of the first through hole 16a that opens to the inner side surface of the first oil ejecting portion 11 and the opening area of the opening 17b of the opening of the second through hole 16b that opens to the inner side surface of the second oil ejecting portion 12 are identical to each other. Therefore, the amount of oil O per unit time flowing into the first through hole 16a from the inside of the first oil injection part 11 and the amount of oil O per unit time flowing into the second through hole 16b from the inside of the second oil injection part 12 can be made to be the same. Thus, the amount of oil O per unit time injected from the first supply port 15a and the amount of oil O per unit time injected from the second supply port 15b can be made to be the same. Therefore, the oil O can be more uniformly supplied to each bearing.

In addition, according to the present embodiment, the inner side surface of the second through hole 16b has the inclined surface 16d that approaches the second bearing 27 as going toward the outer side surface of the second oil ejection portion 12. Therefore, for example, even when the second supply port 15b is disposed at a position axially separated from the second bearing 27 due to restrictions or the like in the arrangement of the second oil ejection portion 12 in the housing 6, the oil O ejected from the second supply port 15b is likely to splash toward the second bearing 27 along the inclined surface 16d. Accordingly, even when the second supply port 15b is disposed at a position axially separated from the second bearing 27, the oil O can be supplied from the second supply port 15b to the second bearing 27.

Further, according to the present embodiment, the extension surface 16c extending from the inner side surface of the second oil ejection portion 12 in the second direction D2 is provided, and the inclined surface 16D extends from the tip end portion of the extension surface 16c to the outer side surface of the second oil ejection portion 12. Therefore, the thickness of the wall portion of the second oil jet portion 12 can be suppressed from being reduced at the edge portion of the opening portion 17b of the second through hole 16b, compared with the case where the inclined surface 16d extends from the inner side surface of the second oil jet portion 12 to the outer side surface of the second oil jet portion 12. This can improve the strength of the edge of the opening 17b, and can suppress damage to the edge of the opening 17 b. Therefore, the variation in the amount of the oil O flowing from the inside of the second oil ejecting portion 12 into the second through hole 16b can be suppressed. Therefore, the variation in the amount of the oil O supplied from the second supply port 15b to the second bearing 27 can be suppressed. In addition, the opening 17b can be separated while preventing a part of the edge from being damaged. Therefore, the mixing of foreign matter into the oil O can be suppressed.

In addition, according to the present embodiment, in the third direction D3, the maximum width of the inclined surface 16D is equal to or smaller than the maximum width of the extension surface 16 c. Therefore, the oil O ejected from the extension surface 16c along the inclined surface 16D can be suppressed from scattering in the third direction D3 on the inclined surface 16D, as compared with the case where the maximum width of the inclined surface 16D is larger than the maximum width of the extension surface 16 c. This makes it easy to splash the oil O injected from the second supply port 15b along the inclined surface 16d in the direction in which the inclined surface 16d extends. Therefore, the oil O ejected from the second supply port 15b is more easily supplied to the second bearing 27.

In addition, according to the present embodiment, the flow area of the first oil injection part 11 and the flow area of the second oil injection part 12 are the same as each other. Therefore, the pressure of the oil O flowing in the first oil ejecting portion 11 and the pressure of the oil O flowing in the second oil ejecting portion 12 are easily equalized. This makes it easier to equalize the potential of the oil O ejected from the first supply port 15a with the potential of the oil O ejected from the second supply port 15 b. Therefore, the oil O can be more uniformly supplied to each bearing.

In addition, according to the present embodiment, the first oil injection part 11 and the second oil injection part 12 are pipes. Therefore, the first oil jet part 11 and the second oil jet part 12 can be easily manufactured, compared with the case where the first oil jet part 11 and the second oil jet part 12 are manufactured by providing holes in the wall part of the housing 6, for example. In addition, the first oil ejecting portion 11 and the second oil ejecting portion 12 can be easily removed from the housing 6 and replaced.

In addition, according to the present embodiment, the first supply port 15a is opened toward the guide portion 69 located around the upper opening portion 68a of the oil passage portion 68. Here, when the temperature of the oil O is high, the viscosity of the oil O becomes low, and the flow rate of the oil O tends to be high. Therefore, the potential of the oil O ejected from the first supply port 15a easily becomes sufficiently large. In this case, as shown by a solid line in fig. 5, the oil O injected from the first supply port 15a is injected in the direction in which the first supply port 15a opens, and is blown to the guide 69. In this way, after the momentum of the ejected oil O is reduced by the guide portion 69, the oil O can be guided to the oil passage portion 68 via the guide portion 69. Therefore, the oil O ejected from the first supply port 15a with a sufficient potential can be suppressed from being directly blown to the oil passage portion 68. Therefore, the oil O can be prevented from splashing on the inner surface of the oil passage portion 68 and scattering outside the oil passage portion 68. This can suppress a decrease in the amount of oil O supplied to the first bearing 26 via the oil passage portion 68.

In addition, when the temperature of the oil O is low, the viscosity of the oil O becomes high, and the flow rate of the oil O tends to be small. Therefore, the momentum of the oil O ejected from the first supply port 15a is likely to be insufficient. In this case, as shown by a broken line in fig. 5, the oil O is likely to drop from the first supply port 15a directly below in the vertical direction. In contrast, according to the present embodiment, the first supply port 15a is located on the upper side of the upper opening 68a in the vertical direction. Therefore, the oil O dropped from the first supply port 15a directly below in the vertical direction can be supplied from the upper opening 68a to the oil passage 68. When the oil O is dropped from the first supply port 15a directly below in the vertical direction, the potential of the oil O is very small, and therefore, even if the oil O is directly supplied to the oil passage portion 68, the oil O is less likely to splash on the inner side surface of the oil passage portion 68. This can suppress a decrease in the amount of oil O supplied to the first bearing 26 via the oil passage portion 68. In addition, even if the temperature of the oil O is low and the flow rate of the oil O is low, the oil O can be directly supplied to the oil passage portion 68, and therefore, the time for which the oil O is supplied from the first supply port 15a to the first bearing 26 is easily shortened. This suppresses the supply of the oil O to the first bearing 26 from slowing down even when the temperature of the oil O is low.

In addition, according to the present embodiment, the oil passage portion 68 has the inclined surface 64e that approaches the first bearing 26 as going from the upper opening portion 68a toward the inside of the support portion 64. Therefore, the oil O supplied to the oil passage portion 68 is easily guided to the first bearing 26 along the inclined surface 64e. This makes it possible to appropriately supply the oil O to the first bearing 26.

In addition, according to the present embodiment, the guide portion 69 has the first rib 66 protruding radially outward from the outer side surface of the support portion 64. Therefore, by blocking the flow of the oil O with the first rib 66, the oil O can be easily guided to the oil path portion 68. In the present embodiment, the guide portion 69 has a connecting portion 64d connecting the upper opening portion 68a and the first rib 66 in the outer side surface of the support portion 64, and the first supply port 15a is opened toward the connecting portion 64 d. Therefore, as shown by a solid line in fig. 5, the oil O ejected to the connection portion 64d can be blocked from flowing to the side opposite to the upper opening portion 68a by the first rib 66. This makes it possible to easily guide the oil O injected into the connecting portion 64d to the upper opening 68 a. Therefore, the oil O can be appropriately guided to the oil passage portion 68 by the guide portion 69. Therefore, the oil O can be appropriately supplied to the first bearing 26 via the oil passage portion 68.

In addition, according to the present embodiment, the connection portion 64d is located at the lower side in the vertical direction from the first rib 66 toward the upper opening 68a. Therefore, the oil O injected to the connection portion 64d is easily caused to flow along the connection portion 64d toward the upper opening portion 68a by gravity. Thus, the oil O can be guided to the oil passage portion 68 more appropriately by the guide portion 69. Therefore, the oil O can be more appropriately supplied to the first bearing 26 via the oil passage portion 68.

In addition, according to the present embodiment, the oil passage portion 68 has the through portion 64c and the second rib 67 protruding radially outward from the peripheral edge portion of the through portion 64 c. Therefore, as in the present embodiment, when the through portion 64c is inclined with respect to the vertical direction, the upper opening portion 68a can be enlarged in the direction orthogonal to the vertical direction by the second rib 67. Specifically, in the present embodiment, the second rib 67 protrudes obliquely rearward from the outer side surface of the support portion 64 upward, so that the upper opening portion 68a can be enlarged rearward. Accordingly, when the oil O drops from the first supply port 15a directly below in the vertical direction due to a low temperature or the like of the oil O, the oil O is easily received through the upper opening 68a. Therefore, the oil O dropped from the first supply port 15a easily flows into the oil passage portion 68. Therefore, the oil O can be more appropriately supplied to the first bearing 26 via the oil passage portion 68.

In addition, according to the present embodiment, the housing 6 has the supporting portion 64 and the coating portion 63c that covers a part of the first supply port 15 a. Therefore, as shown in fig. 6, a part of the oil O ejected from the first supply port 15a can be made to follow the inner wall surface of the housing 6 from the coating portion 63c. This can guide the oil O to the oil passage portion 68 along the inner wall surface of the housing 6. In the present embodiment, a part of the oil O ejected from the first supply port 15a flows from the coating portion 63c into the oil passage portion 68 along the wall surface of the partition wall 63 from the upper opening portion 68a. Therefore, the oil O can be supplied to the oil passage portion 68 more appropriately. Therefore, the oil O can be more appropriately supplied to the first bearing 26 via the oil passage portion 68.

In addition, according to the present embodiment, the oil passage portion 68 extends in a direction inclined with respect to the vertical direction as viewed in the axial direction of the motor axis J1. Therefore, for example, by providing the second rib 67 as described above, the upper opening 68a can be easily enlarged in the direction orthogonal to the vertical direction. In the present embodiment, the oil passage portion 68 extends in a direction that is located forward of the vehicle as going to the lower side in the vertical direction. Therefore, when the vehicle runs downhill, the entire driving device 1 is inclined, and the direction in which the oil passage portion 68 extends is nearly the vertical direction. Thus, the oil O flowing into the oil passage portion 68 from the upper opening portion 68a easily flows inside the oil passage portion 68 toward the inside of the support portion 64, and the oil O can be supplied to the first bearing 26 more easily via the oil passage portion 68. Particularly, when the vehicle is traveling downhill, the speed of the vehicle tends to increase, and the rotational speed of the rotor 20 tends to increase. Therefore, the oil O can be easily supplied to the first bearing 26, so that the rotor 20 rotating at a high speed can be appropriately supported by the first bearing 26.

Further, according to the present embodiment, the first supply port 15a is located upstream of the injection ports 13a, 14a in the flow direction of the oil O flowing in the first oil injection portion 11. Therefore, the flow path length from the oil supply path 94 to the first supply port 15a becomes shorter, and the potential of the oil O ejected from the first supply port 15a tends to become stronger. Even in such a case, according to the present embodiment, as described above, the oil O is guided to the oil passage portion 68 after being received by the guide portion 69, so that the oil O can be suppressed from splashing in the oil passage portion 68. In this way, the effect of suppressing the splashing of the oil O can be more usefully obtained in the structure in which the first supply port 15a is located upstream of the injection ports 13a, 14 a.

< second embodiment >

As shown in fig. 10 and 11, the first oil jet part 211 and the second oil jet part 212 of the present embodiment are pipes as in the first embodiment. As shown in fig. 10, in the first oil jet portion 211, the first supply port 215a is located on the right side of the first bearing 26. The first supply port 215a is an opening portion that opens to the outer surface of the first oil jet portion 211, of opening portions of the first through hole 216a that penetrates the wall portion of the first oil jet portion 211 from the inner surface to the outer surface.

In the present embodiment, the first through hole 216a is located on the upstream side in the flow direction of the oil O in the first oil ejecting portion 211 as it extends from the inner side surface to the outer side surface of the first oil ejecting portion 211. That is, the first through hole 216a is located on the left side as it extends from the inner side surface of the first oil jet part 211 to the outer side surface. Thus, the inner surface of the first through hole 216a has an inclined surface that approaches the first bearing 26 as it goes toward the outer surface of the first oil jet portion 211. In the present embodiment, the entire inner surface of the first through hole 216a is the inclined surface. Since the first through hole 216a has such an inclined surface, even if the first supply port 215a is disposed apart from the first bearing 26 in the axial direction, the oil O can be injected toward the first bearing 26 as shown in fig. 10. Thereby, the oil O ejected from the first supply port 215a is easily supplied to the first bearing 26.

In the present embodiment, the first oil ejecting portion 211 has a protrusion 218 provided on the inner surface of the first oil ejecting portion 211. The protrusion 218 is located at a portion of the inner surface of the first oil ejecting portion 211 on the downstream side in the flow direction of the oil O in the first oil ejecting portion 211 in the peripheral edge portion of the first through hole 216 a. The surface of the protrusion 218 on the upstream side in the flow direction of the oil O in the first oil ejecting portion 211 is a vertical surface 218a orthogonal to the axial direction. In the present embodiment, the vertical surface 218a is a left surface of the protruding portion 218. The surface of the protrusion 218 on the downstream side in the flow direction of the oil O in the first oil ejecting portion 211 is an inclined surface 218b located on the downstream side as going toward the inner surface of the first oil ejecting portion 211. In the present embodiment, the inclined surface 218b is a right surface of the protruding portion 218.

As described above, in the present embodiment, the first through hole 216a is located on the upstream side in the flow direction of the oil O in the first oil jet part 211 as going from the inner side surface to the outer side surface of the first oil jet part 211. Therefore, the oil O flowing in the first through hole 216a flows toward the upstream side in the flow direction of the oil O in the first oil ejection portion 211 in the axial direction. In other words, the axial direction of the oil O flowing in the first through hole 216a is opposite to the axial direction of the oil O flowing in the first oil ejecting portion 211. In contrast, in the present embodiment, by providing the protrusion 218, a part of the oil O flowing in the first oil ejecting portion 211 can be blocked and easily guided into the first through hole 216a. This makes it possible to easily jet the oil O from the first supply port 215 a. Specifically, in the present embodiment, a part of the oil O flowing from the left side to the right side in the first oil jet part 211 is blocked by the vertical surface 218a, flows to the left side, and flows into the first through hole 216a.

As shown in fig. 11, in the present embodiment, the second supply port 215b overlaps the oil passage portion 168 as viewed in the vertical direction. The second supply port 215b is located above the upper opening 168a of the oil passage portion 168. A part of the second supply port 215b is offset to the left of the oil passage portion 168 and the second bearing 27. The second supply port 215b is an opening portion that opens to the outer surface of the second oil jet portion 212, of the opening portions of the second through-hole 216b that penetrates the wall portion of the second oil jet portion 212 from the inner surface to the outer surface. The second through hole 216b extends in a radial direction centered on the central axis of the second oil ejection portion 212. Although not shown, the second supply port 215b is opened toward a guide portion located around the upper opening 168 a. The second supply port 215b is opened obliquely rearward, for example, downward. In the present embodiment, the second supply port 215b corresponds to the first injection port, and the injection ports 13b and 14b of the second oil injection portion 212 correspond to the second injection port.

The second oil ejection portion 212 includes a guide portion 219 for guiding the oil O to the second bearing 27 at the peripheral edge portion of the second supply port 215 b. Therefore, the oil O ejected from the second supply port 215b can be appropriately supplied to the second bearing 27 via the guide portion 219. The guide 219 protrudes in the direction in which the second through hole 216b extends. The guide 219 protrudes obliquely downward and rearward.

The guide 219 has an inclined surface 219a extending from the edge of the second supply port 215b to the top 219b of the guide 219. The inclined surface 219a is located on the right side as it goes to the outside in the radial direction around the center axis of the second oil jet part 212. That is, the inclined surface 219a approaches the wall portion 61b holding the second bearing 27 as it goes to the outside in the radial direction around the center axis of the second oil ejection portion 212. In the present embodiment, the top 219b is a radially outer end portion centered on the center axis of the second oil ejection portion 212, of the right end portions of the guide portions 219. The top 219b is located above the upper opening 168 a.

As shown in fig. 11, at least a part of the oil O ejected from the second supply port 215b flows to the top 219b along the inclined surface 219a of the guide 219. The oil O reaching the top 219b drops directly below in the vertical direction, and flows into the oil passage 168 from the upper opening 168 a. Thereby, at least a part of the oil O injected from the second supply port 215b is supplied to the second bearing 27 via the oil passage portion 168. Therefore, even when a part of the second supply port 215b is arranged offset from the oil passage portion 168 as in the present embodiment and when the entire second supply port 215b is arranged so as to be separated from the oil passage portion 168 in the axial direction, the oil O ejected from the second supply port 215b can be appropriately supplied to the second bearing 27 by arranging the top 219b on the upper side of the oil passage portion 168.

Other structures of the first oil ejection portion 211 of the present embodiment can be the same as those of the first oil ejection portion 11 of the first embodiment. Other structures of the second oil ejection portion 212 of the present embodiment can be the same as those of the second oil ejection portion 12 of the first embodiment.

< third embodiment >

As shown in fig. 12, the oil passage portion 368 of the present embodiment extends in the vertical direction as viewed in the axial direction. The upper opening 368a of the oil passage portion 368 opens vertically directly above. The guide portion 369 of the present embodiment has a first rib 366 and a recess 364j. In the present embodiment, the first rib 366 is provided at a position separated rearward from the oil passage portion 368 in the outer side surface of the support portion 64.

The recess 364j is provided on the outer side surface of the support portion 64. More specifically, the recess 364j is provided in a peripheral edge portion of the upper opening 368a in the outer side surface of the support portion 64. In the present embodiment, the recess 364j is located at the rear side of the upper opening portion 368 a. The concave portion 364j is recessed radially inward. More specifically, the recess 364j is recessed in the direction toward which the first supply port 315a of the present embodiment is directed. The concave portion 364j is concave obliquely rearward toward the lower side, for example. The inner side surface of the recess 364j connects the upper opening portion 368a and the first rib 366.

In the present embodiment, the first oil injection portion 311 is located above the oil passage portion 368. The first supply port 315a of the first oil jet portion 311 overlaps the oil passage portion 368 as viewed in the vertical direction. The first supply port 315a is located above the upper opening 368 a. The first supply port 315a opens obliquely rearward downward. The first supply port 315a opens toward the recess 364j. Therefore, the oil O ejected from the first supply port 315a with a sufficient potential is blown to the concave portion 364j. Thereby, the potential of the oil O ejected from the first supply port 315a can be reduced by the recess 364j. By providing the concave portion 364j in the guide portion 369, the oil O ejected from the first supply port 315a can be easily received. Therefore, scattering of the oil O injected to the guide portion 369 can be suppressed, and the oil O can be easily guided to the oil passage portion 368 by the guide portion 369. Therefore, the oil O ejected from the first supply port 315a can be easily supplied to the first bearing 26. In the present embodiment, the first supply port 315a corresponds to a first injection port.

As shown by a broken line in fig. 12, when the oil O drops from the first supply port 315a directly downward due to a low temperature or the like of the oil O, the oil O dropped from the first supply port 315a flows into the oil passage portion 368 from the upper opening portion 368a that opens directly above in the vertical direction. In the present embodiment, since the oil passage portion 368 extends in the vertical direction, the velocity of the oil O flowing inside the support portion 64 in the oil passage portion 368 is easily increased as compared to the case where the oil passage portion 368 is inclined with respect to the vertical direction. Thus, even when the temperature of the oil O is low and the speed of the oil O is small, the oil O dropped from the first supply port 315a is easily supplied to the first bearing 26 in a short time.

Other structures of the first oil ejection portion 311 of the present embodiment can be the same as those of the first oil ejection portion 11 of the first embodiment. Other structures of the oil passage portion 368 can be the same as those of the oil passage portion 68 of the first embodiment.

The present invention is not limited to the above-described embodiments, and other configurations can be adopted within the scope of the technical idea of the present invention. The orientation of the first injection port opening is not particularly limited as long as it is toward a guide portion opening that guides the oil O to the oil path portion. The first injection port may also be open toward the first rib in the guide portion that guides the oil O to the oil path portion. In the above embodiments, the relative positional relationship between the first supply port and the first bearing and the relative positional relationship between the second supply port and the second bearing are not particularly limited as long as the supply port corresponding to the first injection port opens toward the guide portion that guides the oil O to the oil passage portion.

The first oil supply port for supplying the oil O to the first bearing may be provided in plural in the first oil injection portion. The second oil supply port for supplying the oil O to the second bearing may be provided in plural in the second oil ejecting portion. The number of the first supply ports and the number of the second supply ports may be the same as or different from each other. In the case where a plurality of first supply ports are provided, some of the plurality of first supply ports may correspond to the first injection ports, or all of the plurality of first supply ports may correspond to the first injection ports. In the case where a plurality of second supply ports are provided, some of the plurality of second supply ports may correspond to the first injection ports, or all of the plurality of second supply ports may correspond to the first injection ports.

The opening area of the first supply port and the opening area of the second supply port may also be the same as each other. In this configuration, the pressure of the oil O ejected from the first supply port and the pressure of the oil O ejected from the second supply port can be more easily equalized. When a plurality of first supply ports and second supply ports are provided, the total opening area obtained by adding the opening areas of the plurality of first supply ports and the total opening area obtained by adding the opening areas of the second supply ports may be the same or different from each other. When the total opening area of the first supply port and the total opening area of the second supply port are the same as each other, the pressure of the oil O ejected from the first supply port and the pressure of the oil O ejected from the second supply port can be more easily equalized. Only one of the first supply port and the second supply port may be provided, and the other of the first supply port and the second supply port may be provided in plurality. In this case, the opening area of one supply port and the total opening area obtained by adding the opening areas of the other supply ports may be the same as or different from each other.

In the case where the first oil injection portion and the second oil injection portion are pipes, each pipe may be a polygonal tubular pipe. The first oil injection portion and the second oil injection portion may not be tubes. The first oil injection portion and the second oil injection portion may be oil passages provided in the housing. The oil O may be injected to any portion of the stator as long as the second injection port of the first oil injection portion and the second injection port of the second oil injection portion inject the oil O toward the stator. The second injection port of the first oil injection portion may not include an injection port that injects the oil O to the coil end, or may not include an injection port that injects the oil to the stator core. The second injection port of the second oil injection portion may not include an injection port that injects the oil O to the coil end, or may not include an injection port that injects the oil O to the stator core.

The first through hole may have the same structure as the second through hole 16b in the first embodiment. That is, the inner surface of the first through hole may have an extending surface extending from the inner surface of the first oil ejecting portion in a second direction orthogonal to the first direction in which the first oil ejecting portion extends, and an inclined surface extending from the distal end portion of the extending surface of the first through hole to the outer surface of the first oil ejecting portion. According to this structure, the edge portion of the opening portion opening inside the first oil ejecting portion among the opening portions of the first through hole can be suppressed, and the wall portion of the first oil ejecting portion 11 can be thinned. Therefore, the variation in the amount of oil O flowing into the first through-hole can be suppressed as in the second through-hole 16b of the first embodiment described above. Further, it is possible to prevent the edge of the opening of the first through hole from being damaged and separated, and to prevent foreign matter from being mixed into the oil O.

The first oil injection portion may have a guide portion for guiding the oil O to the first bearing at a peripheral edge portion of the first supply port. According to this configuration, the oil O ejected from the first supply port can be appropriately supplied to the first bearing via the guide portion, similarly to the second oil ejecting portion 212 of the second embodiment described above. The first oil injection portion may have a guide portion for guiding the oil O to the first bearing at a peripheral portion of the first supply port, and the second oil injection portion may have a guide portion for guiding the oil O to the second bearing at a peripheral portion of the second supply port. According to this structure, oil can be easily and effectively supplied to both the first bearing and the second bearing.

The oil passage portion is not particularly limited as long as it has an upper opening portion and extends from the outside to the inside of the support portion. The oil passage portion may be free of the second rib. In this case, when the temperature of the oil O is low, the oil O may be directly introduced into the through portion provided in the oil passage portion when the oil O is dropped from the first supply port as the first injection port. The inclined surface of the inner surface of the oil passage portion, which is closer to the bearing as it goes from the upper opening portion toward the inside of the support portion, may be inclined in any direction. The structure of the guide portion that guides the oil O to the oil path portion is not particularly limited. The guide portion that guides the oil O to the oil path portion may be free of the first rib.

The oil supply passage connecting the first oil injection portion and the second oil injection portion may be of any shape or may be provided at any position. The oil O may be supplied from different oil passages to the first oil injection portion and the second oil injection portion. The oil injection portion may be at least one oil injection portion having the first injection port. For example, in the first embodiment described above, the second oil injection portion 12 may not be provided.

The driving device is not particularly limited as long as it is a device capable of moving an object to be driven by a motor as a power source. The driving device may not include a transmission mechanism. The torque of the motor may be directly output from the shaft of the motor to the subject. In this case, the driving device corresponds to the motor itself. The direction in which the motor shaft extends is not particularly limited as long as it intersects the vertical direction. The motor shaft may extend in a direction inclined with respect to the horizontal direction. In the present specification, the term "the motor shaft extends in the horizontal direction orthogonal to the vertical direction" includes a case where the motor shaft extends substantially in the horizontal direction, as well as a case where the motor shaft extends strictly in the horizontal direction. That is, in the present specification, the motor axis may be slightly inclined with respect to the horizontal direction in the case of "the motor axis extends in the horizontal direction orthogonal to the vertical direction". In the above embodiment, the case where the driving device does not include the inverter unit has been described, but the present invention is not limited thereto. The drive device may also comprise an inverter unit. In other words, the drive device may also be constructed integrally with the inverter unit.

The use of the driving device is not particularly limited. The drive device may not be mounted on the vehicle. The structures described in this specification can be appropriately combined within a range not contradicting each other.

Claims

1. A driving device is characterized by comprising:

a motor having a rotor rotatable about a motor axis extending in a direction intersecting the vertical direction and a bearing rotatably supporting the rotor;

an annular supporting portion for supporting the bearing on the inner side;

an oil passage portion having an upper opening portion that opens to an upper side in a vertical direction outside the support portion and that extends from the outside of the support portion to an inside of the support portion;

a guide portion which is located around the upper opening portion and guides oil to the oil path portion; and

an oil injection part having a first injection port overlapping the oil passage part when viewed in the vertical direction,

the first injection port is located at the upper side of the upper opening in the vertical direction and is opened toward the guide portion,

the guide part has:

a first rib protruding radially outward from an outer surface of the support portion; and

a connecting portion connecting the upper opening portion and the first rib to each other on an outer side surface of the supporting portion,

The oil passage portion includes:

a through portion that penetrates the support portion from the outer side surface to the inner side surface; and

a second rib protruding radially outward from a peripheral edge portion of the through portion in an outer surface of the support portion,

the first injection port is located on the upper side in the vertical direction of a circumferential side surface of the second rib which forms a part of an inner side surface of the oil passage portion,

the connecting portion is a peripheral edge portion of the through portion and is located between the through portion and a circumferential direction of the first rib,

in the second rib, a circumferential side surface constituting a part of an inner side surface of the oil passage portion faces the first rib with the through portion interposed therebetween.

2. The driving device according to claim 1, wherein,

the inner surface of the oil passage portion has an inclined surface that approaches the bearing as it goes from the upper opening portion toward the inner side of the support portion.

3. Drive device according to claim 1 or 2, characterized in that,

the first ejection port opens toward the connection portion.

4. Drive device according to claim 1 or 2, characterized in that,

the connection portion is located at a lower side in the vertical direction from the first rib toward the upper opening portion.

5. Drive device according to claim 1 or 2, characterized in that,

the motor has a stator located radially outward of the rotor,

the stator includes:

a stator core; and

a coil assembly having a plurality of coils and mounted on the stator core,

the coil block has coil ends protruding from the stator core in an axial direction of the motor shaft,

the coil ends are annular around the motor shaft,

at least a part of the first rib is inserted into the inside of the coil end.

6. Drive device according to claim 1 or 2, characterized in that,

the guide portion has a recess provided on an outer surface of the support portion.

7. Drive device according to claim 1 or 2, characterized in that,

also comprises a housing for accommodating the motor therein,

the housing has:

the supporting part; and

and a coating part which covers a part of the first injection port.

8. Drive device according to claim 1 or 2, characterized in that,

the oil passage portion extends in a direction inclined with respect to the vertical direction when viewed in the axial direction of the motor shaft.

9. The driving device according to claim 8, wherein,

The driving device is mounted on a vehicle,

the oil passage portion extends in a direction that is located forward of the vehicle as it goes toward the lower side in the vertical direction.

10. Drive device according to claim 1 or 2, characterized in that,

the oil injection part has a second injection port for injecting oil toward the stator of the motor,

the first injection port is located upstream of the second injection port in a flow direction of the oil flowing through the oil injection portion.