JP7459622B2 - drive device - Google Patents

Description

The present invention relates to a drive device.

There is a known configuration for supplying oil injected from an oil injection unit to a bearing. For example, Patent Document 1 describes a pipe as such an oil injection unit.

JP 2011-259644 A

In the above configuration, there is a possibility that at least a portion of the oil injected from the oil injection part may hit a portion that holds the bearing, etc., and splash, and may not reach the bearing. Therefore, there is a possibility that the amount of oil supplied to the bearing may be reduced.

In view of the above circumstances, one object of the present invention is to provide a drive device having a structure that can suppress a reduction in the amount of oil supplied to the bearings.

One embodiment of the drive device of the present invention includes a motor having a rotor rotatable around a motor shaft and a first bearing that rotatably supports the rotor, a first holder that holds the first bearing, and an oil injection unit having a first injection port that injects oil. The first holder faces the first injection port across a gap and has a buffer section that covers the first injection port, and a first guide flow path that extends from the buffer section and guides oil toward the first bearing.

According to one aspect of the present invention, in the drive device, it is possible to suppress a reduction in the amount of oil supplied to the bearing.

FIG. 1 is a schematic diagram showing a drive device according to a first embodiment. FIG. 2 is a cross-sectional view showing a part of the drive device of the first embodiment, taken along line II-II in FIG. FIG. 3 is a cross-sectional view showing a part of the drive device of the first embodiment, illustrating the first guide channel. FIG. 4 is a cross-sectional view showing a part of the drive device of the first embodiment, illustrating the second guide channel. FIG. 5 is a perspective cross-sectional view showing the guide wall portion and the first oil jet portion of the first embodiment. FIG. 6 is a perspective view showing the stator, the first oil injection section, and the second oil injection section of the first embodiment. FIG. 7 is a cross-sectional view showing a first guide channel in a modified example of the first embodiment. FIG. 8 is a sectional view showing the guide wall portion of the second embodiment.

In the following description, the vertical direction will be defined based on the positional relationship when the drive device of each embodiment is mounted on a vehicle located on a horizontal road surface. That is, the relative positional relationship with respect to the vertical direction described in each of the embodiments below needs to be satisfied at least when the drive device is mounted on a vehicle located on a horizontal road surface.

In the drawings, the 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 is simply called the "upper side", and the lower side in the vertical direction is simply called the "lower side". The X axis direction is a direction perpendicular to the Z axis direction and is the front-rear direction of the vehicle on which the drive unit is mounted. In each of 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 perpendicular to both the X axis direction and the Z axis direction, and is the left-right direction of the vehicle, i.e., the vehicle width direction. In each of 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 perpendicular to the vertical direction.

Note that 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 shaft J1, which is shown appropriately in each figure, extends in a direction intersecting the vertical direction. More specifically, the motor shaft J1 extends in the Y-axis direction perpendicular to the vertical direction, i.e., in the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the motor shaft J1 will be simply referred to as the "axial direction", the radial direction centered on the motor shaft J1 will be simply referred to as the "radial direction", and the circumferential direction centered on the motor shaft J1, i.e., around the axis of the motor shaft J1, will be simply referred to as the "circumferential direction". Note that in this specification, "parallel direction" includes a direction that is approximately parallel, and "orthogonal direction" includes a direction that is approximately orthogonal.

First Embodiment
The drive device 1 of the present embodiment shown in FIG. 1 is mounted on a vehicle powered by a motor, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV), and is used as the power source thereof. As shown in FIG. 1, the drive device 1 includes a motor 2, a transmission device 3 including a reduction gear 4 and a differential gear 5, a housing 6, an oil pump 96, a cooler 97, and an oil supply unit 10. As shown in FIG. 2, the oil supply unit 10 includes a first oil injection unit 11 and a second oil injection unit 12. That is, the drive device 1 includes the first oil injection unit 11 and the second oil injection unit 12. In this embodiment, the drive device 1 does not include an inverter unit. In other words, the drive device 1 is structured separately from the inverter unit.

As shown in FIG. 1, the housing 6 accommodates the motor 2 and the transmission device 3 therein. The housing 6 has a motor accommodating section 61, a gear accommodating section 62, and a first holder 63. In other words, the drive device 1 includes the first holder 63. The motor accommodating section 61 is a section that accommodates the rotor 20 and the stator 30 described below. The motor accommodating section 61 surrounds the stator core 32 described below from the radial outside.

The motor housing 61 has a second holder 61b that holds the second bearing 27 described later. In other words, the drive unit 1 is equipped with the second holder 61b. The second holder 61b is located on the right side of the stator 30. Although not shown, the second holder 61b has an annular support portion that supports the second bearing 27 on the inside. The annular support portion, not shown, has a through hole that connects the outside and inside of the support portion. 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 first holder 63 holds the first bearing 26 of the motor 2, which will be described later. The first holder 63 is located on the left side of the stator 30, which will be described later. As shown in FIG. 3, the first holder 63 has a partition portion 63a, an upper wall portion 63h, a support portion 63c, a plurality of ribs 63g, and a guide wall portion 65. As shown in FIG. 1, the partition portion 63a axially separates the interior of the motor accommodating portion 61 from the interior of the gear accommodating portion 62. A partition opening 63b is provided in the partition portion 63a. The partition opening 63b connects the interior of the motor accommodating portion 61 to the interior of the gear accommodating portion 62.

As shown in FIG. 4, the upper wall portion 63h protrudes, for example, to the right from the upper end of the partition portion 63a. A hole portion 63i is provided in the upper wall portion 63h. The left end portion of the first oil injection portion 11 is fitted into the hole portion 63i. The hole portion 63i is connected to the fourth flow path 94 described later.

As shown in FIG. 3, the support portion 63c is an annular portion that supports the first bearing 26 on the inside. The support portion 63c is, for example, an annular shape centered on the motor shaft J1. The support portion 63c protrudes, for example, to the right side from the partition portion 63a. The support portion 63c has a through hole 63d that connects the outside and the inside of the support portion 63c. The through hole 63d penetrates the support portion 63c in the radial direction from the outer peripheral surface to the inner peripheral surface. In this embodiment, the through hole 63d extends in the vertical direction. The through hole 63d has an outer opening 63e that opens on the outer peripheral surface of the support portion 63c. In this embodiment, the outer opening 63e opens on the upper side. The outer opening 63e opens, for example, directly upward.

The plurality of ribs 63g extend radially outward from the support portion 63c. The plurality of ribs 63g protrude to the right from the partition wall 63a. The plurality of ribs 63g are, for example, plate-shaped with plate surfaces facing in the circumferential direction. For example, the plurality of ribs 63g are arranged at intervals along the circumferential direction. The plurality of ribs 63g are arranged, for example, at equal intervals all around the circumferential direction.

The plurality of ribs 63g include guide ribs 63f. That is, the first holder 63 has a guide rib 63f. The guide rib 63f extends radially outward from the peripheral edge of the outer opening 63e on the outer peripheral surface of the support portion 63c. In this embodiment, the guide rib 63f extends upward from a portion of the outer circumferential surface of the support portion 63c that is located on the rear side of the outer opening 63e. The guide rib 63f extends diagonally upward and rearward from the outer circumferential surface of the support portion 63c, for example. The guide rib 63f extends, for example, from the support portion 63c to the upper wall portion 63h. The guide rib 63f connects the support portion 63c and the upper wall portion 63h, for example.

In this embodiment, the guide wall portion 65 is provided on the upper wall portion 63h. As shown in FIGS. 3 and 5, in this embodiment, the guide wall portion 65 has an annular shape surrounding the first oil injection portion 11. As shown in FIGS. The inner circumferential surface 65a of the guide wall portion 65 is, for example, a cylindrical wall surface centered on the central axis J4 of the first oil injection portion 11. The central axis J4 is, for example, a virtual axis parallel to the motor axis J1, and extends in the axial direction. In this embodiment, the axial direction of the motor shaft J1 corresponds to the axial direction of the central axis J4. Further, the left side corresponds to "one side in the axial direction", and the right side corresponds to "the other side in the axial direction".

As shown in FIG. 4, the guide wall portion 65 is located, for example, to the right of the hole portion 63i. The inside of the guide wall portion 65 is connected, for example, to the inside of the hole portion 63i. The inner diameter of the guide wall portion 65 is, for example, larger than the inner diameter of the hole portion 63i. In this embodiment, the guide wall portion 65 opens in the axial direction of the central axis J4. The guide wall portion 65 opens, for example, to the right. The guide wall portion 65 opens, for example, into the inside of the motor accommodating portion 61.

As shown in FIG. 1, the housing 6 contains oil O as a refrigerant inside. In this embodiment, the oil O is contained inside the motor housing portion 61 and inside the gear housing portion 62. An oil reservoir P in which the oil O accumulates is provided in the lower region inside the gear housing portion 62. The oil O in the oil reservoir P is sent to the inside of the motor housing portion 61 by an oil passage 90, which will be described later. The oil O sent to the inside of the motor housing portion 61 accumulates in the lower region inside the motor housing portion 61. At least a portion of the oil O that has accumulated inside the motor housing portion 61 moves to the gear housing portion 62 through the partition opening 63b and returns to the oil reservoir P.

In this specification, "oil is stored inside a certain part" means that oil is located inside a certain part at least part of the time while the motor is running, and oil does not have to be located inside a certain part when the motor is stopped. For example, in this embodiment, oil O is stored inside the motor housing part 61 means that oil O is located inside the motor housing part 61 at least part of the time while the motor 2 is running, and when the motor 2 is stopped, all of the oil O inside the motor housing part 61 may have moved to the gear housing part 62 through the partition opening 63b. Note that a portion of the oil O sent to the inside of the motor housing part 61 by the oil passage 90 described later may remain inside the motor housing part 61 when the motor 2 is stopped.

The oil O circulates in the oil passage 90, which will be described later. The oil O is used to lubricate the reduction gear 4 and the differential gear 5. The oil O is also used to cool the motor 2. As the oil O, it is preferable to use an oil equivalent to the lubricating oil for automatic transmissions (ATF: Automatic Transmission Fluid), which has a relatively low viscosity, in order to function as a lubricating oil and a cooling oil.

As shown in FIG. 2, the housing 6 has a plurality of contact portions 64 that protrude radially inward from the inner peripheral surface of the motor housing portion 61. As shown in FIG. The contact portion 64 contacts the outer circumferential surface of a stator core body 32a, which will be described later. The contact portion 64 has a through groove 64a that penetrates the contact portion 64 in the circumferential direction.

As shown in FIG. 1, the motor 2 has a rotor 20, a stator 30, a first bearing 26, and a second bearing 27. The rotor 20 can rotate around a motor axis J1 extending in the horizontal direction. The rotor 20 has a shaft 21 and a rotor body 24. Although not shown, the rotor body 24 has a rotor core and a rotor magnet fixed to the rotor core. The shaft 21 extends in the axial direction around the motor axis J1. The shaft 21 rotates around the motor axis J1. The shaft 21 is a hollow shaft with a hollow portion 22 provided inside. The shaft 21 has a communication hole 23. The communication hole 23 extends in the radial direction and connects the hollow portion 22 to the outside of the shaft 21. The shaft 21 extends across the motor accommodating portion 61 and the gear accommodating portion 62 of the housing 6.

The stator 30 faces the rotor 20 in the radial direction with a gap therebetween. Stator 30 is located radially outside of rotor 20. Stator 30 includes a stator core 32 and a coil assembly 33. Stator core 32 is located on the outside of rotor 20 in the radial direction. Stator core 32 surrounds rotor 20 . Stator core 32 is fixed to the inner circumferential surface of motor accommodating portion 61 .

As shown in FIGS. 2 and 6, the stator core 32 includes a stator core main body 32a and a fixing portion 32b. The outer circumferential surface of the stator core body 32a is, for example, cylindrical with the motor axis J1 at the center. The fixing portion 32b protrudes radially outward from the outer circumferential surface of the stator core body 32a. The fixed portion 32b is a portion fixed to the housing 6. A plurality of fixing portions 32b are provided at intervals along the circumferential direction. For example, four fixing parts 32b are provided. The four fixing parts 32b are arranged, for example, at equal intervals over one circumference in the circumferential direction.

In this embodiment, the fixing part 32b projecting upward from the stator core body 32a is an upper fixing part 32f located above the motor shaft J1. In this embodiment, the fixing portion 32b that projects forward from the stator core body 32a is a front fixing portion 32g.

As shown in FIG. 6, the fixing portion 32b extends in the axial direction. The fixing part 32b has a fixing hole 32c that passes through the fixing part 32b in the axial direction. As shown in FIG. 2, a bolt 35 extending in the axial direction is passed through the fixing hole 32c. The bolt 35 is passed through the fixing hole 32c and tightened into a female screw hole provided in the first holder 63. The fixing portion 32b is fixed to the first holder 63 by tightening the bolt 35 into the female screw hole.

As shown in FIG. 1, the coil assembly 33 includes a plurality of coils 31 attached to the stator core 32 along the circumferential direction. The plurality of coils 31 are respectively attached to each tooth of the stator core 32 via an insulator (not shown). The plurality of coils 31 are arranged along the circumferential direction.

Coil assembly 33 has coil ends 33a and 33b that protrude from stator core 32 in the axial direction. The coil end 33a is a portion that projects from the stator core 32 to the left side. The coil end 33b is a portion that protrudes from the stator core 32 to the right side. Coil end 33a includes a portion of each coil 31 included in coil assembly 33 that protrudes to the left of stator core 32. Coil end 33b includes a portion of each coil 31 included in coil assembly 33 that protrudes to the right side of stator core 32. As shown in FIG. 6, in this embodiment, the coil ends 33a and 33b have an annular shape centered on the motor shaft J1. Although not shown, the coil ends 33a and 33b may include a binding member for binding each coil 31, or may include a crossover wire for connecting each coil 31.

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 rotatably supports the left side of the rotor 20. More specifically, the first bearing 26 rotatably supports a portion of the rotor 20 located on the left side of the stator core 32. In this embodiment, the first bearing 26 supports a portion of the shaft 21 located on the left side of the portion to which the rotor main body 24 is fixed. The first bearing 26 is held inside the support portion 63c of the first holder 63.

The second bearing 27 rotatably supports the right side of the rotor 20. More specifically, the second bearing 27 rotatably supports a portion of the rotor 20 located to the right of the stator core 32. In this embodiment, the second bearing 27 supports a portion of the shaft 21 located to the right of the portion to which the rotor body 24 is fixed. The second bearing 27 is held inside the support portion of the second holder 61b.

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. The torque output from the motor 2 is transmitted to the differential device 5 via the reduction gear 4. The reduction gear 4 has a first gear 41, a second gear 42, a third gear 43, and an intermediate shaft 45. The differential device 5 has a ring gear 51. When the vehicle turns, the differential device 5 transmits the same torque to the axles 55 of both the left and right wheels while absorbing the speed difference between the left and right wheels.

The motor 2 is provided with an oil passage 90 through which the oil O circulates inside the housing 6. The oil passage 90 is a path for the oil O that supplies the oil O from the oil reservoir P to the motor 2 and guides it back to the oil reservoir P. The oil passage 90 is provided across the interior of the motor housing portion 61 and the interior of the gear housing portion 62.

Note that in this specification, "oil path" means an oil path. Therefore, the term "oil path" is a concept that includes not only a "flow path" that creates a constant flow of oil in one direction, but also a path where oil temporarily remains and a path where oil drips. The path for temporarily retaining oil includes, for example, a reservoir for storing 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 each circulate the oil O inside the housing 6. The first oil passage 91 has a scooping passage 91a, a shaft supply passage 91b, an inner shaft passage 91c, and an inner rotor passage 91d. In addition, a first reservoir 93 is provided in the first oil passage 91. The first reservoir 93 is provided in the gear housing portion 62.

The scraping path 91 a is a path that scrapes up oil O from the oil reservoir P by rotation of the ring gear 51 of the differential device 5 and receives the oil O in the first reservoir 93 . Note that when the liquid level S of the oil reservoir P is high, such as immediately after the motor 2 is driven, the first reservoir 93 is scraped up by the second gear 42 and the third gear 43 in addition to the ring gear 51. It also receives oil O. The shaft supply path 91b guides the oil O from the first reservoir 93 to the hollow portion 22 of the shaft 21. The intra-shaft path 91c is a path through which the oil O passes through the hollow portion 22 of the shaft 21. The internal rotor path 91d is a path through which oil O passes through the interior of the rotor body 24 from the communication hole 23 of the shaft 21 and is scattered onto the stator 30.

Oil O that reaches the stator 30 removes heat from the stator 30. After cooling the stator 30, the oil O drips downward and accumulates in the lower area of the motor housing 61. The oil O that accumulates in the lower area of the motor housing 61 moves to the gear housing 62 through the partition opening 63b provided in the first holder 63. In this way, the first oil passage 91 supplies oil O to the rotor 20 and the stator 30.

In the second oil passage 92, oil O is pulled up from the oil reservoir P and supplied to the stator 30. The second oil passage 92 is provided with an oil pump 96, a cooler 97, and an oil supply section 10. The second oil passage 92 has a first passage 92a, a second passage 92b, a third passage 92c, and a fourth passage 94.

The first flow path 92a, the second flow path 92b, the third flow path 92c, and the fourth flow path 94 are provided in the wall of the housing 6. The first flow path 92a connects the oil reservoir 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 fourth flow path 94. The third flow path 92c is provided, for example, in the front wall of the wall of the motor housing section 61. The fourth flow path 94 is provided in the partition section 63a of the first holder 63. The fourth flow path 94 connects the third flow path 92c and the oil supply section 10.

The oil supply unit 10 supplies oil O as a refrigerant to the motor 2. As shown in FIG. 6, in the oil supply unit 10 of this embodiment, the first oil injection unit 11 and the second oil injection unit 12 are tube members extending in the axial direction. The first oil injection unit 11 and the second oil injection unit 12 are, for example, cylindrical and extending linearly in the axial direction. The first oil injection unit 11 and the second oil injection unit 12 are, for example, parallel to each other. As shown in FIG. 2, the first oil injection unit 11 and the second oil injection unit 12 are accommodated inside the housing 6. The first oil injection unit 11 and the second oil injection unit 12 are located radially outside the stator 30. The first oil injection unit 11 and the second oil injection unit 12 are arranged at a circumferential interval from each other. The radial position of the first oil injection unit 11 and the radial position of the second oil injection unit 12 are, for example, the same.

Note that in this specification, "certain parameters are the same" includes not only cases where certain parameters are strictly the same, but also cases where certain parameters are substantially the same. "Certain parameters are substantially the same" includes, for example, that certain parameters are slightly different from each other within the range of tolerance.

In addition, in this specification, "the first oil injection section and the second oil injection section extend linearly in the axial direction of the motor shaft" includes cases where the first oil injection section and the second oil injection section extend linearly in the axial direction strictly, as well as cases where the first oil injection section and the second oil injection section extend linearly in the axial direction approximately. That is, in this embodiment, "the first oil injection section 11 and the second oil injection section 12 extend linearly in the axial direction" may mean, for example, that the first oil injection section 11 and the second oil injection section 12 extend slightly tilted relative to the axial direction. In this case, the direction in which the first oil injection section 11 tilts relative to the axial direction and the direction in which the second oil injection section 12 tilts relative to the axial direction may be the same or different.

As shown in FIG. 6, the first oil injection unit 11 is, for example, cylindrical and centered on a central axis J4 extending in the axial direction and open to the left. Although not shown, the first oil injection unit 11 is, for example, fixed to the housing 6. The first oil injection unit 11 is located above the motor shaft J1. In this embodiment, the first oil injection unit 11 is located above the stator 30. More specifically, in this embodiment, the first oil injection unit 11 is located above the upper ends of the coil ends 33a and 33b. The radial position of the first oil injection unit 11 is, for example, the same as the radial position of the fixed portion 32b. The first oil injection unit 11 is, for example, located behind the upper fixed portion 32f.

In this specification, "a certain object is located on one side of another object in a certain direction" includes a state where, when the drive unit is arranged on a horizontal plane and the certain object and the other object are viewed from one side in a certain direction, the certain object and the other object overlap with each other and are located in front of the other object. For example, in the case where the first oil injection unit 11 is located above the stator 30 as in this embodiment, when the drive unit 1 is arranged on a horizontal plane and the first oil injection unit 11 and the stator 30 are viewed from above, the first oil injection unit 11 and the stator 30 overlap with each other and are located in front of the stator 30. In this specification, "a state where the drive unit is arranged on a horizontal plane" includes a state where a vehicle equipped with the drive unit is arranged on a horizontal road surface.

As shown in FIG. 4, the left end of the first oil injection part 11 is fitted into the hole 63i. The interior of the first oil injection part 11 is connected to the fourth flow path 94 via the hole 63i. A part of the left part of the first oil injection part 11 is located inside the guide wall part 65. As shown in FIG. 3, the outer peripheral surface of the first oil injection part 11 and the inner peripheral surface 65a of the guide wall part 65 are arranged opposite each other with a gap in the radial direction centered on the central axis J4, for example, around the entire circumference.

As shown in FIG. 6, the first oil injection section 11 has an oil flow path 17 through which oil O flows. The inner surface of the oil flow path 17 is the inner surface of the cylindrical first oil injection section 11 . The oil flow path 17 extends in the axial direction and opens on the left side. The left opening of the oil flow path 17 is connected to the fourth flow path 94 . Oil O flows into the oil flow path 17 from the fourth flow path 94 .

As shown in FIG. 4, oil O flows from the left to the right in the oil flow passage 17 of this embodiment. That is, in the flow direction of oil O as a fluid in the oil flow passage 17, the left side is the upstream side and the right side is the downstream side. The flow passage cross-sectional shape of the oil flow passage 17 is, for example, circular. In this embodiment, the flow passage cross-section of the oil flow passage 17 is the cross-section of the oil flow passage 17 perpendicular to the axial direction. The right end of the oil flow passage 17 is closed.

As shown in FIG. 6, in this embodiment, the first oil injection part 11 has a first injection port 16a, a second injection port 16b, a third injection port 13, and a fourth injection port 14. The first injection port 16a, the second injection port 16b, the third injection port 13, and the fourth injection port 14 are connected to the oil flow path 17. The first injection port 16a, the second injection port 16b, the third injection port 13, and the fourth injection port 14 are injection ports that inject the oil O that has flowed into the oil flow path 17.

The first injection port 16a, the second injection port 16b, the third injection port 13, and the fourth injection port 14 are provided on the outer peripheral surface of the first oil injection unit 11. In this embodiment, the first injection port 16a, the second injection port 16b, the third injection port 13, and the fourth injection port 14 are openings that open on the outer peripheral surface of the first oil injection unit 11 among the openings of the hole that penetrates the wall portion of the first oil injection unit 11 from the inner peripheral surface to the outer peripheral surface. The first injection port 16a, the second injection port 16b, the third injection port 13, and the fourth injection port 14 are, for example, circular. The first injection port 16a, the second injection port 16b, the third injection port 13, and the fourth injection port 14 face, for example, downward.

In this embodiment, the third injection nozzles 13 are provided in multiples on the left side and the right side of the first oil injection unit 11. For example, four third injection nozzles 13 are provided on the left side and the right side of the first oil injection unit 11. The four third injection nozzles 13 provided on the left side of the first oil injection unit 11 are arranged in a zigzag pattern along the circumferential direction. The four third injection nozzles 13 provided on the left side of the first oil injection unit 11 include, for example, one third injection nozzle 13 that opens directly below, two third injection nozzles 13 that open diagonally forward below, and one third injection nozzle 13 that opens diagonally backward below. The four third injection nozzles 13 provided on the right side of the first oil injection unit 11 are arranged in the same manner as the four third injection nozzles 13 provided on the left side of the first oil injection unit 11, except for their axial positions.

The four third injection ports 13 provided on the left side of the first oil injection part 11 are located above the coil end 33a. The four third injection ports 13 provided on the right side of the first oil injection part 11 are located above the coil end 33b. Therefore, the oil O injected from the third injection port 13 is supplied to the coil ends 33a and 33b from above. That is, the third injection port 13 is an injection port that injects oil O as a refrigerant toward the coil ends 33a and 33b. Thus, in this embodiment, the first oil injection section 11 injects oil O as a refrigerant from the plurality of third injection ports 13 toward the coil ends 33a and 33b.

In this embodiment, the fourth injection port 14 is provided in the central portion of the first oil injection unit 11 in the axial direction. The fourth injection port 14 is located between the multiple third injection ports 13 provided in the left portion of the first oil injection unit 11 and the multiple third injection ports 13 provided in the right portion of the first oil injection unit 11 in the axial direction. For example, multiple fourth injection ports 14 are provided at intervals in the axial direction. For example, two fourth injection ports 14 are provided. As shown in FIG. 2, the fourth injection port 14 opens, for example, diagonally forward on the lower side. As shown in FIG. 6, the fourth injection port 14 is located on the upper side of the stator core 32. Therefore, the oil O injected from the fourth injection port 14 is supplied to the stator core 32 from the upper side. That is, in this embodiment, the fourth injection port 14 is an injection port that injects oil O as a refrigerant toward the stator core 32.

In this specification, "the nozzle faces vertically downward" means that the direction of the nozzle includes a downward component, and the nozzle may face directly downward or may face a direction inclined from directly downward. As described above, in this embodiment, the third nozzle 13 includes a third nozzle 13 facing directly downward, a third nozzle 13 facing a direction inclined diagonally forward from directly downward, and a third nozzle 13 facing a direction inclined diagonally backward from directly downward. In this embodiment, the fourth nozzle 14 faces a direction inclined diagonally forward from directly downward. In this embodiment, "the fourth nozzle 14 faces downward" means that the fourth nozzle 14 may face, for example, directly downward or may face a direction inclined diagonally backward from directly downward.

In this embodiment, the first injection port 16a is provided on the left side of the first oil injection section 11. The first injection port 16a is located on the left side of the plurality of third injection ports 13 provided on the left side portion of the first oil injection section 11, for example. As shown in FIG. 3 , the first injection port 16 a is provided in a portion of the first oil injection section 11 located inside the guide wall section 65 . For example, the first injection port 16a faces directly below. At least a portion of the oil O injected from the first injection port 16a is supplied to the first bearing 26.

As shown in FIG. 5, the first injection port 16a faces the inner circumferential surface 65a of the guide wall portion 65 across a gap. In this embodiment, the first injection port 16a is located above the lower portion of the inner circumferential surface 65a of the guide wall portion 65. The portion of the inner circumferential surface 65a of the guide wall portion 65 that faces the first injection port 16a across a gap is the buffer portion 67. In other words, the first holder 63 has the buffer portion 67 that faces the first injection port 16a across a gap. The guide wall portion 65 has the buffer portion 67. In this embodiment, the inner circumferential surface 65a of the guide wall portion 65 is the wall surface of the guide wall portion 65 that has the buffer portion 67. The buffer portion 67 covers the first injection port 16a. In this embodiment, the buffer portion 67 covers the first injection port 16a from the lower side. The buffer portion 67 includes, for example, the portion located at the lowest side of the inner circumferential surface 65a.

The width of the gap between the first injection port 16a and the buffer portion 67 is large enough to allow at least the oil O injected from the first injection port 16a to flow. In this embodiment, the width of the gap between the first injection port 16a and the buffer section 67 is the distance from the first injection port 16a to the buffer section 67 in the radial direction centered on the central axis J4, and This is the shortest distance between the buffer section 67 and the buffer section 67. The width of the gap between the first injection port 16a and the buffer portion 67 is, for example, smaller than the inner diameter of the first injection port 16a when viewed in the direction in which the oil O is injected from the first injection port 16a. The width of the gap between the first injection port 16a and the buffer section 67 is, for example, smaller than the length of a hole having the first oil injection section 11 as an opening. In this embodiment, the length of the hole having the first oil injection part 11 as an opening is the dimension of the hole in the radial direction centering on the central axis J4, and the length of the hole in the radial direction centered on the central axis J4. 1 is the shortest distance from the inner peripheral surface to the outer peripheral surface of the oil injection part 11. The width of the gap between the first injection port 16a and the buffer portion 67 is, for example, less than 1 mm.

In this embodiment, the oil O injected from the first injection port 16a is sprayed onto the buffer portion 67, and then branches into oil O that flows along a first guide passage 71 provided in the guide wall portion 65, and oil O that flows along a second guide passage 72 provided in the guide wall portion 65. Thus, in this embodiment, the first holder 63 has the first guide passage 71 and the second guide passage 72.

As shown in FIG. 3, the first guide channel 71 is a channel that guides the oil O toward the first bearing 26. As shown in FIG. The first guide channel 71 extends from the buffer section 67 . In this embodiment, the first guide channel 71 is a channel extending from the buffer section 67 toward the first bearing 26 . In this embodiment, the first guide channel 71 is a channel extending from the buffer section 67 toward the outer opening 63e. In addition, in this specification, "the first guide channel extends from the buffer part toward a certain object" means that the end of the first guide channel on the opposite side to the side where the buffer part connects is further away from the buffer part. It only needs to be close to a certain object.

In this embodiment, the first guide flow passage 71 has a first flow passage portion 71a and a second flow passage portion 71b. The first flow passage portion 71a is provided on the inner peripheral surface 65a of the guide wall portion 65. In other words, the first flow passage portion 71a is provided on the wall surface of the guide wall portion 65 that has the buffer portion 67. In this embodiment, the first flow passage portion 71a is composed of the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil injection portion 11. The first flow passage portion 71a extends, for example, from the buffer portion 67 toward the front side along the circumferential direction around the central axis J4. As shown in FIG. 5, the first flow passage portion 71a opens, for example, to the right side.

In the present embodiment, the first flow path portion 71a is located at an upper side as it becomes farther away from the buffer portion 67 in the circumferential direction around the central axis J4. That is, in this embodiment, the entire first flow path section 71a is located above the buffer section 67. As a result, at least a portion of the first guide channel 71 is located above the buffer section 67. For example, the first flow path portion 71a is located at the upper side toward the front side.

The second flow path portion 71b is provided in the guide wall portion 65. As shown in FIG. 3, the second flow path portion 71b extends toward the first bearing 26 from the first flow path portion 71a. In this embodiment, the second flow path portion 71b is located above the first bearing 26. In this embodiment, the second flow path portion 71b extends in a direction inclined with respect to the vertical direction. The second flow path portion 71b extends, for example, in a direction obliquely inclined in the front-rear direction with respect to the vertical direction. The second flow path portion 71b extends diagonally downward and forward from, for example, the end of the first flow path portion 71a on the side opposite to the side connected to the buffer portion 67. As shown in FIG. 5, the second flow path portion 71b opens on the right side, for example.

In this embodiment, the second flow path section 71b is configured by a hole 65b penetrating the guide wall section 65. The hole 65b extends linearly through the guide wall 65 from the inner circumferential surface 65a of the guide wall 65 to the lower surface of the guide wall 65. The lower surface of the guide wall portion 65 constitutes a part of the lower surface of the upper wall portion 63h. For example, the hole 65b opens on the right side.

The upper end of the second flow path portion 71b is an upper opening portion 71e that opens into a gap between the inner circumferential surface 65a of the guide wall portion 65 and the outer circumferential surface of the first oil injection portion 11. The upper opening 71e is located in front of and above the buffer section 67. The lower end of the second flow path portion 71b is a lower opening portion 71d that opens to the lower surface of the guide wall portion 65. The lower opening 71d is located in front and below the upper opening 71e. As shown in FIG. 3, in this embodiment, the lower opening 71d is located above the outer opening 63e. The lower opening 71d is located, for example, directly above the outer opening 63e.

A part of the oil O injected from the first injection port 16a and sprayed onto the buffer portion 67 flows from the first flow passage portion 71a into the first guide flow passage 71. The oil O that flows into the first guide flow passage 71 flows from the first flow passage portion 71a to the second flow passage portion 71b and flows out from the lower opening 71d. The oil O that flows out of the first guide flow passage 71 drips downward and flows into the through hole 63d from the outer opening 63e. In this way, in this embodiment, the first guide flow passage 71 guides the oil O toward the outer opening 63e. The oil O that flows into the through hole 63d flows downward through the through hole 63d and is supplied to the first bearing 26. In this way, in this embodiment, the first guide flow passage 71 guides the oil O toward the first bearing 26 by guiding the oil O from the buffer portion 67 to the portion located above the outer opening 63e.

In this specification, "the first guide channel guides oil toward the first bearing" means that at least a portion of the oil flowing out from the first guide channel can be supplied to the first bearing. The first guide flow path may not necessarily extend directly to the first bearing. In addition, in this specification, "the first guide channel guides oil toward the first bearing" means, for example, that the portion of the first guide channel from which oil flows out is the first guide channel. The part of the first guide flow path where oil flows into the first guide flow path is located closer to the outer opening of the through hole provided in the first bearing or the support part that supports the first bearing. including. Note that in this specification, "the first guide channel guides oil toward the first bearing" means that a portion of the first guide channel from which oil flows out is connected to the first guide channel. The part of the flow path where oil flows into the first guide flow path may be located further from the outer opening of the through hole provided in the first bearing or the support portion that supports the first bearing. .

In this embodiment, the portion of the first guide flow path 71 into which the oil O flows is a portion of the first flow path portion 71a that is connected to the buffer portion 67. A portion of the first guide passage 71 from which the oil O in the first guide passage 71 flows out is the lower opening 71d of the second passage portion 71b. The lower opening 71d is located closer to the first bearing 26 than the portion of the first flow path portion 71a that is connected to the buffer portion 67. The lower opening 71d is located closer to the outer opening 63e than the portion of the first flow path portion 71a that connects to the buffer portion 67.

In addition, in this specification, "the second flow path extends from the first flow path toward the first bearing" means that the portion of the second flow path from which the oil in the second flow path flows out is , be located closer to the outer opening of the through hole provided in the first bearing or the support part that supports the first bearing than the part of the second flow path part through which oil flows into the second flow path part. Bye. In this embodiment, the portion of the second flow path portion 71b into which the oil O flows is the upper opening portion 71e. A portion of the second flow path portion 71b from which the oil O in the second flow path portion 71b flows out is the lower opening portion 71d. The lower opening 71d is located closer to the first bearing 26 than the upper opening 71e. The lower opening 71d is located closer to the outer opening 63e than the upper opening 71e.

As shown in FIG. 4, the second guide passage 72 guides the oil O to a different position from the position guided by the first guide passage 71. In this embodiment, the second guide flow path 72 guides the oil O toward the stator 30. The second guide flow path 72, for example, guides oil O toward the coil end 33a. The second guide channel 72 extends from the buffer section 67 . In this embodiment, the second guide channel 72 includes a third channel section 72a and a fourth channel section 72b.

The third flow path portion 72a is provided on the inner peripheral surface 65a of the guide wall portion 65. In other words, the third flow path portion 72a is provided on the wall surface of the guide wall portion 65 that has the buffer portion 67. In this embodiment, the third flow path portion 72a is formed by the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil injection portion 11. The third flow path portion 72a extends, for example, from the buffer portion 67 to the right side. The third flow path portion 72a opens, for example, to the right side.

In this embodiment, the fourth flow passage portion 72b is provided on the right end face of the guide wall portion 65. The fourth flow passage portion 72b extends downward from the right end of the third flow passage portion 72a. The fourth flow passage portion 72b is located, for example, above the coil end 33a. The fourth flow passage portion 72b is an oil passage through which oil O flows downward along the right end face of the guide wall portion 65.

A portion of the oil O injected from the first injection port 16a and sprayed onto the buffer section 67 flows from the third flow path section 72a into the second guide flow path 72. The oil O that flows into the second guide flow path 72 flows from the third flow path section 72a to the fourth flow path section 72b and flows out of the second guide flow path 72. The oil O that flows out of the second guide flow path 72 drips downward and is supplied to the coil end 33a from above. In this way, in this embodiment, the second guide flow path 72 guides the oil O from the buffer section 67 to the portion located above the coil end 33a, thereby directing the oil O toward the stator 30.

In addition, in this specification, "the second guide flow path guides oil toward a position different from the position where the first guide flow path leads" means that the oil is guided from within the second guide flow path of the second guide flow path It is sufficient that the portion from which the oil flows out is located at a different position from the portion of the first guide flow path from which the oil flows out from within the first guide flow path. In this embodiment, the portion of the second guide flow path 72 from which the oil O flows out is the lower end of the fourth flow path portion 72b. The lower end of the fourth flow path portion 72b is located at a different position from the lower opening 71d.

In addition, in this specification, "the second guide passage guides the oil toward the stator" means that at least a portion of the oil flowing out of the second guide passage can be supplied to the stator, and the second guide passage does not have to extend directly to the stator. In addition, in this specification, "the second guide passage guides the oil toward the stator" includes, for example, that the portion of the second guide passage from which the oil flows out is closer to the stator than the portion of the second guide passage from which the oil flows into the second guide passage.

In this embodiment, the portion of the second guide passage 72 into which the oil O flows is the portion of the third passage section 72a that is connected to the buffer section 67. The lower end of the fourth passage section 72b is located closer to the stator 30 than the portion of the third passage section 72a that is connected to the buffer section 67.

As described above, in this embodiment, the oil O injected from the first injection port 16a is branched by the guide wall portion 65 and supplied to each of the first bearing 26 and the coil end 33a.

As shown in FIG. 6, the second injection port 16b is located on the right side of the plurality of third injection ports 13 provided on the right side of the first oil injection section 11, for example. The second injection port 16b is provided, for example, at the right end of the first oil injection section 11. In this embodiment, the second injection port 16b is located on the right side of the first injection port 16a. That is, in this embodiment, the first injection port 16a is located upstream of the second injection port 16b in the flow direction of the oil O in the oil flow path 17. The second injection port 16b is located above the second bearing 27. At least a portion of the oil O injected from the second injection port 16b is supplied to the second bearing 27.

Oil O injected from the second nozzle 16b is injected toward the through hole of the support part (not shown) provided in the second holder 61b. As a result, the oil O injected from the second nozzle 16b is supplied to the second bearing 27 supported on the inside of the support part provided in the second holder 61b through the through hole (not shown). Unlike the first nozzle 16a, the second nozzle 16b is not covered by the buffer part 67. In other words, unlike the first holder 63, the second holder 61b in this embodiment does not have the buffer part 67. In other words, the buffer part 67 is provided only in the first holder 63 out of the first holder 63 and the second holder 61b.

In this specification, "the buffer section is provided only in the first holder out of the first holder and the second holder" means that the buffer section is provided in the first holder and not in the second holder, and the buffer section may be provided in a portion other than the first holder and the second holder.

As shown in FIG. 2, the second oil injection part 12 is located on the front side of the stator core 32. The entire second oil injection part 12 overlaps with the shaft 21, for example, when viewed in the front-rear direction. The second oil injection part 12 is located above the motor shaft J1, for example. The radial position of the second oil injection part 12 is, for example, the same as the radial position of the fixed part 32b. The second oil injection part 12 is located below the first oil injection part 11. The second oil injection part 12 is located, for example, above the front fixing part 32g. The first oil injection part 11 and the second oil injection part 12 are arranged with the upper fixing part 32f in between in the circumferential direction.

As shown in FIG. 6, the second oil injection unit 12 is, for example, cylindrical, extending in the axial direction and opening to the left. Although not shown, the second oil injection unit 12 is, for example, fixed to the housing 6. The right end of the second oil injection unit 12 is closed. Although not shown, the left end of the second oil injection unit 12 is connected to the fourth flow path 94 via a hole provided in the first holder 63.

The second oil injection section 12 has an oil flow path 18 through which oil O flows. The inner surface of the oil flow path 18 is the inner surface of the cylindrical second oil injection part 12. The oil flow path 18 extends in the axial direction and opens on the left side. The left opening of the oil flow path 18 is connected to the fourth flow path 94 . Oil O flows into the oil flow path 18 from the fourth flow path 94 . In the oil passage 18 of this embodiment, the oil O flows from the left side to the right side. The cross-sectional shape of the oil flow path 18 is, for example, circular. The right end of the oil flow path 18 is closed.

The second oil injection unit 12 has a plurality of fourth injection ports 15. From the fourth injection ports 15, the oil O that has flowed into the second oil injection unit 12 is injected toward the stator 30. The fourth injection ports 15 are provided on the outer peripheral surface of the second oil injection unit 12. The plurality of fourth injection ports 15 are arranged at intervals along the axial direction. The number of fourth injection ports 15 provided in the second oil injection unit 12 is greater than the number of fourth injection ports 14 provided in the first oil injection unit 11. For example, six fourth injection ports 15 are provided. The fourth injection ports 15 are openings that open on the outer peripheral surface of the second oil injection unit 12 among the openings of the hole that penetrates the wall portion of the second oil injection unit 12 from the inner peripheral surface to the outer peripheral surface. The fourth injection port 15 is, for example, circular.

As shown in FIG. 2, the fourth injection port 15 faces upward. In this embodiment, the fourth injection port 15 faces diagonally upward and rearward. The fourth injection port 15 is located on the front side of the stator core 32. The oil O injected from the fourth injection port 15 is injected diagonally upward and rearward and is supplied to the outer peripheral surface of the stator core body 32a.

In addition, in this specification, "the injection port faces upward" means that the direction of the injection port should include an upward component, and the injection port may face directly upward, or the injection port may It may also be facing in an inclined direction with respect to the top. As described above, the fourth injection port 15 of this embodiment is oriented obliquely rearward with respect to directly above. In the present embodiment, "the fourth injection port 15 faces upward" means that the fourth injection port 15 may, for example, face directly above or be inclined diagonally forward relative to directly above. It may be suitable for you.

The oil pump 96 shown in FIG. 1 is an electric pump that sends oil O as a refrigerant. The oil pump 96 sucks up oil O from the oil reservoir P through the first flow path 92a, and supplies the oil O to the second flow path 92b, the cooler 97, the third flow path 92c, the fourth flow path 94, and the oil O from the oil reservoir P through the first flow path 92a. Oil O is supplied to the motor 2 via the supply section 10. Thereby, the oil O can be supplied to the stator 30 from the first oil injection part 11 and the second oil injection part 12, and the stator 30 can be cooled. Further, oil O can be supplied from the first oil injection part 11 to the first bearing 26 and the second bearing 27 as lubricating oil.

Oil O supplied to the stator 30 from the first oil injection unit 11 and the second oil injection unit 12 drips downward and accumulates in the lower region of the motor housing unit 61. Oil O supplied to the first bearing 26 and the second bearing 27 may also drip downward and accumulate in the lower region of the motor housing unit 61. Oil O that accumulates in the lower region of the motor housing unit 61 moves to the oil reservoir P of the gear housing unit 62 through the partition opening 63b provided in the first holder 63. In this way, the second oil passage 92 supplies oil O to the stator 30, the first bearing 26, and the second bearing 27.

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 via an internal flow path of the cooler 97. The cooler 97 is connected to a cooling water pipe 98 that passes cooling water cooled by a radiator (not shown). The oil O passing through the inside of the cooler 97 is cooled by heat exchange with the cooling water passing through the cooling water pipe 98.

According to the present embodiment, the first holder 63 holding the first bearing 26 has a buffer section 67 that faces the first injection port 16a with a gap therebetween, covers the first injection port 16a, and extends from the buffer section 67. , and a first guide flow path 71 that guides the oil O toward the first bearing 26. Therefore, the oil O injected from the first injection port 16a is sprayed onto the buffer section 67. Thereby, the buffer portion 67 can reduce the force of the oil O injected from the first injection port 16a. Further, the oil O whose force has been reduced by being blown onto the buffer portion 67 can be guided toward the first bearing 26 by the first guide channel 71 . Therefore, it is possible to suppress the oil O supplied to the first bearing 26 from splashing around the support portion 63c that supports the first bearing 26, etc., and it is possible to suitably supply the oil O to the first bearing 26. Therefore, it is possible to suppress the amount of oil O supplied to the first bearing 26 from decreasing.

In this embodiment, the force of the oil O injected from the first injection port 16a can be reduced by the buffer portion 67, compared to the case where the oil O is directly sprayed from the first injection port 16a to the outer opening 63e. , the force of the oil O supplied to the outer opening 63e can be reduced. Thereby, it is possible to suppress the oil O from splashing on the inner surface of the through hole 63d, and it is possible to suppress the oil O from scattering to the outside of the through hole 63d. Therefore, the oil O flowing out from the first guide channel 71 can be suitably supplied into the through hole 63d. Therefore, oil O can be suitably supplied to the first bearing 26 via the through hole 63d.

In addition, according to this embodiment, the first guide flow passage 71 has a first flow passage portion 71a provided on the wall surface of the guide wall portion 65 having the buffer portion 67, and a second flow passage portion 71b provided on the guide wall portion 65 and extending from the first flow passage portion 71a toward the first bearing 26. Therefore, the oil O after being sprayed onto the buffer portion 67 can be easily made to flow into the first guide flow passage 71 via the first flow passage portion 71a on the same wall surface as the buffer portion 67. In addition, the flow direction of the oil O flowing through the first flow passage portion 71a can be made to face the first bearing 26 by the second flow passage portion 71b. This makes it easier to guide the oil O after being sprayed from the first injection port 16a onto the buffer portion 67 to the first bearing 26 via the first guide flow passage 71. Therefore, it is possible to further suppress a reduction in the amount of oil O supplied to the first bearing 26.

Further, according to the present embodiment, the second flow path portion 71b is located above the first bearing 26 and extends in a direction inclined with respect to the vertical direction. Therefore, compared to, for example, the case where the second flow path portion 71b extends straight along the vertical direction, it is easier to reduce the speed of the oil O flowing within the second flow path portion 71b according to gravity. Thereby, the speed of the oil O after flowing out from the first guide channel 71 can be easily reduced. Therefore, it is possible to further suppress the oil O after flowing out from the first guide channel 71 from splashing on the inner surface of the through hole 63d. Therefore, the oil O after flowing out from the first guide channel 71 can be suitably supplied to the first bearing 26. Thereby, it is possible to further suppress a reduction in the amount of oil O supplied to the first bearing 26.

In addition, according to this embodiment, the guide wall portion 65 is annular and surrounds the first oil injection portion 11. Therefore, the oil O is easily allowed to flow along the gap between the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil injection portion 11. As a result, even if the drive unit 1 is tilted and the position of the second flow path portion 71b is located higher, for example, when the vehicle equipped with the drive unit 1 runs on a slope, the oil O is easily guided to the second flow path portion 71b through the gap between the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil injection portion 11. In addition, the oil O can be stored around the entire circumference in the gap between the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil injection portion 11. Therefore, the oil O that cannot be discharged from the second flow path portion 71b is easily stored in the gap between the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil injection portion 11. This prevents oil O that cannot be completely discharged from the second flow passage 71b from flowing to unintended locations.

In addition, according to this embodiment, at least a portion of the first guide passage 71 is located above the buffer section 67. Therefore, the oil O after being injected from the first injection port 16a into the buffer section 67 flows upward against gravity at least a portion of the time while flowing through the first guide passage 71. This makes it easier to reduce the speed of the oil O in the first guide passage 71. Therefore, it is possible to more effectively prevent the oil O after flowing out of the first guide passage 71 from splashing on the inner surface of the through hole 63d, etc. Therefore, the oil O after flowing out of the first guide passage 71 can be preferably supplied to the first bearing 26. This makes it possible to more effectively prevent the amount of oil O supplied to the first bearing 26 from decreasing.

In addition, according to this embodiment, the first holder 63 has a second guide passage 72 extending from the buffer section 67. The second guide passage 72 guides the oil O toward a position different from the position to which the first guide passage 71 guides the oil O. Therefore, a part of the oil O after being injected from the first injection port 16a to the buffer section 67 can flow along the second guide passage 72. This makes it possible to prevent the flow rate of the oil O flowing through the first guide passage 71 from becoming too large. Therefore, it is possible to prevent the speed of the oil O flowing through the first guide passage 71 from becoming too fast. Therefore, it is possible to further prevent the oil O after flowing out of the first guide passage 71 from splashing on the inner surface of the through hole 63d, etc. This makes it possible to further prevent the amount of oil O supplied to the first bearing 26 from decreasing. In addition, the second guide passage 72 can also supply oil O to a part other than the first bearing 26.

Further, according to the present embodiment, the second guide flow path 72 guides the oil O toward the stator 30. Therefore, the stator 30 can be cooled more suitably while further suppressing a reduction in the amount of oil O supplied to the first bearing 26. In this embodiment, the oil O can be supplied to the coil end 33a through the second guide channel 72 and the third injection port 13, so that the coil end 33a can be suitably cooled.

Further, according to the present embodiment, the guide wall portion 65 opens in the axial direction of the central axis J4 of the first oil injection portion 11. Therefore, a part of the oil O after being injected from the first injection port 16a to the buffer section 67 can flow into the axial opening of the guide wall section 65. Thereby, the second guide channel 72 as in this embodiment can be easily provided without separately providing a hole or the like. For example, if the second guide flow path 72 is not provided, the flow path flowing from the buffer portion 67 to the axial opening of the guide wall portion 65 may be used as at least a portion of the first guide flow path. You can also do it. In this case, the structure of the housing 6 can be simplified because there is no need to provide the hole 65b to provide the second flow path portion 71b as in the present embodiment.

Further, according to the present embodiment, the first injection port 16a is located upstream of the second injection port 16b in the flow direction of the oil O in the oil flow path 17. Therefore, the force of the oil O injected from the first injection port 16a tends to be larger than the force of the oil O injected from the second injection port 16b. Thereby, the oil O injected from the first injection port 16a is more likely to jump around the support portion 63c and the like than the oil O injected from the second injection port 16b. In contrast, according to the present embodiment, the force of the oil O injected from the first injection port 16a can be reduced by the buffer portion 67, so that the oil O injected from the first injection port 16a is supported. It is possible to suppress jumping at the portion 63c and the like. As described above, the effect of reducing the force of the oil O by the buffer section 67 is more effective when the buffer section 67 is provided for the first injection port 16a located upstream of the second injection port 16b. be.

In addition, according to this embodiment, the buffer portion 67 is provided only in the first holder 63 out of the first holder 63 and the second holder 61b. Therefore, the structure of the housing 6 can be simplified compared to the case where the buffer portion 67 is provided in both the first holder 63 and the second holder 61b. In addition, the second bearing 27 held in the second holder 61b is supplied with oil O from the second injection port 16b located downstream of the first injection port 16a. The momentum of the oil O injected from the second injection port 16b tends to be smaller than the momentum of the oil O injected from the first injection port 16a. Therefore, the oil O injected from the second injection port 16b is less likely to splash at the support portion of the second holder 61b, etc., compared to the oil O injected from the first injection port 16a. As a result, even if the buffer portion 67 is not provided for the second holder 61b, the amount of oil O supplied to the second bearing 27 is less likely to be reduced.

Further, according to the present embodiment, the first holder 63 has a guide rib 63f extending radially outward from the peripheral edge of the outer opening 63e on the outer peripheral surface of the support portion 63c. Therefore, for example, even if the direction of the oil O flowing out from the first guide channel 71 toward the outer opening 63e is shifted, the oil O is easily guided to the outer opening 63e by the guide rib 63f. This makes it easier to flow the oil O from the first guide channel 71 to the outer opening 63e, and makes it easier to supply the oil O to the first bearing 26 through the through hole 63d. Therefore, reduction in the amount of oil O supplied to the first bearing 26 can be further suppressed.

Further, for example, when the drive device 1 is tilted due to the vehicle on which the drive device 1 is mounted runs uphill, the lower opening 71d of the first guide channel 71 is positioned directly above the guide rib 63f. You may be in a situation where you In this case, the oil O flowing out from the lower opening 71d drips onto the guide rib 63f from above. Therefore, the oil O flowing out from the lower opening 71d can be sent to the outer opening 63e along the guide rib 63f. Therefore, reduction in the amount of oil O supplied to the first bearing 26 can be further suppressed.

(Modification of the first embodiment)
As shown in FIG. 7, the first injection port 116a in the first oil injection unit 111 of this modification opens obliquely upward on the front side. The buffer unit 167 of this modification is located in front of the first injection port 116a. The first flow path portion 171a in the first guide flow path 171 of this modification extends downward from the buffer unit 167 along the circumferential direction around the central axis J4. The first flow path portion 171a is located rearward as it moves downward. The lower end of the first flow path portion 171a is connected to the upper opening 71e. In this modification, the entire first guide flow path 171 is located lower than the buffer unit 167. Therefore, the oil O injected from the first injection port 116a to the buffer unit 167 can be easily made to flow in the first guide flow path 171 by utilizing gravity. The other configurations of this modification can be similar to the other configurations of the above-mentioned embodiment.

<Second embodiment>
As shown in FIG. 8 , the guide wall portion 265 of this embodiment is located below the first oil injection portion 11 . The guide wall portion 265 extends in the circumferential direction around the central axis J4. The guide wall portion 265 has, for example, an arcuate shape that is convex downward when viewed in the axial direction. The upper surface of the guide wall portion 265 is, for example, a curved surface along the circumferential direction around the central axis J4. In this embodiment, the buffer section 267 is provided on the upper surface of the guide wall section 265. For example, the dimension in the front-rear direction of the portion of the guide wall portion 265 located on the front side of the buffer portion 267 is smaller than the dimension in the front-rear direction of the portion of the guide wall portion 265 located on the rear side of the buffer portion 267. In other words, the front end of the guide wall 265 is located closer to the buffer section 267 than the rear end of the guide wall 265 . The front end of the guide wall 265 is located below the rear end of the guide wall 265, for example.

In this embodiment, the first guide channel 271 includes a first channel section 271a and a second channel section 271b. The first flow path section 271a is provided on the upper surface of the guide wall section 265. In this embodiment, the upper surface of the guide wall portion 265 is a wall surface of the guide wall portion 265 that has a buffer portion 267 . The first flow path portion 271a extends forward from the buffer portion 267 along the upper surface of the guide wall portion 265. In this embodiment, the second flow path section 271b is configured by the front end surface of the guide wall section 265. The second flow path portion 271b extends diagonally downward and forward from the front end of the first flow path portion 271a. The other configurations of this embodiment can be made similar to the other configurations of the first embodiment.

According to this embodiment, the shape of the guide wall 265 can be simplified compared to the case where the guide wall 265 is annular surrounding the first oil injection part 11. Therefore, it is easy to form the guide wall portion 265. Furthermore, since the second flow path portion 271b can be created using the front end surface of the guide wall portion 265, there is no need to make holes in the guide wall portion 265, and the first guide flow path 271 can be easily created. be able to. Furthermore, by making the front end of the guide wall 265 lower than the rear end of the guide wall 265, the oil O injected from the first injection port 16a to the buffer section 267 flows forward. It's easy to do. Therefore, the oil O injected from the first injection port 16a to the buffer portion 267 can easily flow along the first guide flow path 271.

The present invention is not limited to the above-described embodiments, and other configurations may be adopted within the scope of the technical idea of the present invention. The first guide channel may have any shape as long as it extends from the buffer and can direct the oil toward the first bearing. For example, an uneven shape may be provided on the flow path surface of the first guide flow path. According to this configuration, the uneven shape makes it easy to reduce the speed of the oil flowing through the first guide flow path. Therefore, splashing of the oil supplied from the first guide flow path to the first bearing can be more easily suppressed. The entire first guide channel may be located above the buffer section in the vertical direction. In the second embodiment described above, the second flow path portion 271b may be formed by providing a hole in the guide wall portion 265. The first guide flow path may include only one flow path portion extending in one direction. The buffer portion may be provided in both the first holder and the second holder. In this case, the buffer provided in the second holder faces the second injection port with a gap therebetween and covers the second injection port. The shape of the buffer section is not particularly limited. The buffer portion may be a curved surface, a flat surface, or an uneven surface.

The second guide passage may have any shape as long as it guides oil toward a position different from the position to which the first guide passage guides oil. The second guide passage may guide oil toward a portion other than the stator. The second guide passage may guide oil toward the first bearing. The second guide passage need not be provided.

In the embodiment described above, the first oil injection section 11 is an oil injection section having the first injection port 16a covered by the buffer section 67, but the present invention is not limited thereto. For example, the second oil injection section 12 in the embodiment described above may be an oil injection section having a first injection port covered by a buffer section. A plurality of oil injection parts each having a first injection port covered by a buffer part may be provided. The oil injection part does not have to be a pipe member. In this case, the oil injection part may be made by providing a hole in the housing. The oil injection section does not need to have any other injection ports as long as it has at least one first injection port.

The guide rib may have any shape and may be provided at any position as long as it extends radially outward from the peripheral edge of the outer opening on the outer peripheral surface of the support portion that supports the first bearing. Good too. A plurality of guide ribs may be provided. Guide ribs may not be provided.

The drive device is not particularly limited as long as it is a device that can move a target object using a motor as a power source. The drive device does not need to include a transmission mechanism. The torque of the motor may be output directly to the target from the motor shaft. In this case, the drive device corresponds to the motor itself. The direction in which the motor shaft extends is not particularly limited. In the above embodiment, the drive device does not include an inverter unit, but this is not limited to this. The drive device may include an inverter unit. In other words, the drive device may be integral with the inverter unit.

The use of the drive device is not particularly limited. The drive device does not have to be mounted on the vehicle. The configurations and methods described above in this specification can be combined as appropriate within a mutually consistent range.

1...Driver, 2...Motor, 11...First oil injection section (oil injection section), 16a, 116a...First injection port, 16b...Second injection port, 17...Oil flow path, 20...Rotor, 26...First bearing, 27...Second bearing, 30...Stator, 63d...Through hole, 61b...Second holder, 63...First holder, 63c...Support section, 63e...Outer opening, 63f...Guide rib, 65, 265...Guide wall section, 65a...Inner circumferential surface (wall surface), 67, 167, 267...Buffer section, 71, 171, 271...First guide flow path, 71a, 171a, 271a...First flow path section, 71b, 271b...Second flow path section, 72...Second guide flow path, J1...Motor shaft, J4...Central shaft, O...Oil

Claims (13)

a motor including a rotor rotatable around a motor shaft, a stator positioned radially outward of the rotor, and a first bearing rotatably supporting the rotor;
a first holder that holds the first bearing;
an oil injection unit having a first injection port for injecting oil;
Equipped with
The stator includes:
A stator core;
a coil end protruding from the stator core in an axial direction of the motor shaft;
having
The first holder includes:
a buffer portion that faces the first injection port with a gap therebetween and covers the first injection port;
a first guide passage extending from the buffer portion and guiding oil toward the first bearing;
The oil injection portion is located radially outside the stator,
The buffer portion is located radially outward from the coil end . The first holder has a guide wall portion having the buffer portion,
The first guide flow path is
a first flow path portion provided on a wall surface of the guide wall portion having the buffer portion;
a second flow path portion provided in the guide wall portion and extending from the first flow path portion toward the first bearing;
The drive device according to claim 1, comprising: The drive device according to claim 2, wherein the second flow passage portion is located vertically above the first bearing and extends in a direction inclined relative to the vertical direction. The oil injection unit is a pipe member,
The drive device according to claim 2 , wherein the guide wall portion is annular and surrounds the oil injection portion. a motor having a rotor rotatable around a motor shaft, and a first bearing rotatably supporting the rotor;
a first holder that holds the first bearing;
an oil injection part having a first injection port that injects oil;
Equipped with
The first holder is
a buffer portion that faces the first injection port with a gap therebetween and covers the first injection port;
a first guide flow path extending from the buffer portion and guiding oil toward the first bearing;
a guide wall portion having the buffer portion;
having
The oil injection part is a pipe member,
The guide wall portion is annular and surrounds the oil injection portion. The drive device according to claim 4 or 5 , wherein the guide wall portion is opened in the axial direction of the central axis of the oil injection portion. The drive device according to claim 1 , wherein at least a portion of the first guide channel is located vertically above the buffer section. The drive device according to any one of claims 1 to 6 , wherein the entire first guide channel is located vertically below the buffer section. The first holder has a second guide flow path extending from the buffer section,
The drive device according to any one of claims 1 to 8 , wherein the second guide flow path guides oil to a different position from the position where the first guide flow path leads the oil. The drive device according to claim 9 , wherein the second guide flow path guides the oil toward a stator that faces the rotor in a radial direction with a gap therebetween . The motor has a second bearing that rotatably supports the rotor,
The first bearing rotatably supports one axial side of the rotor,
The second bearing rotatably supports the other axial side of the rotor,
The oil injection part is
an oil flow path through which oil flows;
a second injection port that injects oil;
has
The first injection port and the second injection port are connected to the oil flow path,
At least a portion of the oil injected from the first injection port is supplied to the first bearing,
At least a portion of the oil injected from the second injection port is supplied to the second bearing,
The drive device according to any one of claims 1 to 10 , wherein the first injection port is located upstream of the second injection port in the flow direction of oil in the oil flow path. further comprising a second holder that holds the second bearing,
The drive device according to claim 11 , wherein the buffer section is provided only in the first holder among the first holder and the second holder. The first holder is
an annular support portion that supports the first bearing inside;
a guide rib extending radially outward from the support portion;
has
The support part has a through hole that connects the outside and the inside of the support part,
The through hole has an outer opening that opens on the outer peripheral surface of the support part,
the first guide channel guides oil toward the outer opening;
The drive device according to any one of claims 1 to 12 , wherein the guide rib extends radially outward from a peripheral edge of the outer opening on an outer peripheral surface of the support portion.

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