CN113472125B

CN113472125B - Driving device

Info

Publication number: CN113472125B
Application number: CN202110324604.1A
Authority: CN
Inventors: 牧野隆之
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2020-03-31
Filing date: 2021-03-26
Publication date: 2024-06-25
Anticipated expiration: 2041-03-26
Also published as: JP2021164297A; JP7459622B2; CN113472125A

Abstract

One embodiment of the driving device of the present invention includes: a motor having a rotor rotatable about a motor shaft and a first bearing that rotatably supports the rotor; a first holder that holds a first bearing; and an oil injection portion having a first injection port that injects oil. The first holder has: a buffer portion facing the first ejection port with a gap therebetween and covering the first ejection port; and a first guide flow path extending from the buffer portion and guiding the oil to the first bearing.

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 pipe 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

Technical problem to be solved by the invention

In the above-described configuration, at least a part of the oil injected from the oil injection portion may collide with a portion or the like holding the bearing and splash, so that the oil may not reach the bearing. Therefore, the amount of oil supplied to the bearing may be 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.

Technical proposal adopted for solving the technical problems

One embodiment of the driving device of the present invention includes: a motor having a rotor rotatable about a motor shaft and a first bearing that rotatably supports the rotor; a first holder that holds the first bearing; and an oil injection portion having a first injection port that injects oil. The first holder includes a buffer portion facing the first injection port with a gap therebetween and covering the first injection port, and a first guide flow path extending from the buffer portion and guiding oil to the first bearing.

Effects of the invention

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

Drawings

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

Fig. 2 is a cross-sectional view showing a part of the driving device according to the first embodiment, and is a cross-sectional view ii-ii in fig. 1.

Fig. 3 is a cross-sectional view showing a part of the driving device according to the first embodiment, and is a view showing the first guide flow path.

Fig. 4 is a cross-sectional view showing a part of the driving device according to the first embodiment, and is a diagram showing the second guide flow path.

Fig. 5 is a perspective cross-sectional view showing the guide wall portion and the first oil ejection portion of the first embodiment.

Fig. 6 is a perspective view showing the stator, the first oil ejecting portion, and the second oil ejecting portion according to the first embodiment.

Fig. 7 is a cross-sectional view showing a first guide flow path in a modification of the first embodiment.

Fig. 8 is a cross-sectional view showing a guide wall portion according to the second embodiment.

Symbol description

1A driving device; 2, a motor; 11 a first oil ejection portion (oil ejection portion); 16a, 116a first ejection port; 16b second ejection openings; 17 oil flow paths; a 20 rotor; a first bearing 26; a second bearing 27; 30 stators; 63d through holes; 61b second holder; 63 a first holder; 63c a support portion; 63e outside opening portions; 63f guide ribs; 65. 265 guide wall portions; 65a inner peripheral surface (wall surface); 67. 167, 267 buffer portions; 71. 171, 271 first guide flow paths; 71a, 171a, 271 a; 71b, 271b second flow path portions; a second guide flow path 72; a J1 motor shaft; a J4 central axis; o oil.

Detailed Description

In the following description, the vertical direction is defined and described based on the positional relationship in the case where the driving device of each embodiment is mounted on a vehicle 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 be at least satisfied when the driving device is mounted on a vehicle 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 vehicle width direction that is a left-right direction of the vehicle. 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.

A 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 shaft J1 is simply referred to as an "axial direction", a radial direction around the motor shaft J1 is simply referred to as a "radial direction", and a circumferential direction around the motor shaft J1, which is a circumferential direction around the motor shaft 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 such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), and an Electric Vehicle (EV) that uses a motor as a power source, and is used as the power source. As shown in fig. 1, the driving device 1 includes a motor 2, a transmission device 3, a housing 6, an oil pump 96, a cooler 97, and an oil supply portion 10, wherein the transmission device 3 includes a reduction gear 4 and a differential gear 5. As shown in fig. 2, the oil supply portion 10 has a first oil injection portion 11 and a second oil injection portion 12. That is, the driving device 1 includes the first oil injection portion 11 and the second oil injection portion 12. In the present embodiment, the drive device 1 does not include an inverter unit. In other words, the driving device 1 is configured to be separated 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 includes a motor housing portion 61, a gear housing portion 62, and a first holder 63. That is, the driving device 1 includes the first holder 63. The motor housing 61 is a portion that houses the rotor 20 and the stator 30, which will be described later. The motor housing 61 encloses the stator core 32 described later from the radially outer side.

The motor housing portion 61 includes a second holder 61b for holding a second bearing 27 described later. That is, the driving device 1 includes 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 for supporting the second bearing 27 inside. The annular support portion, not shown, has a through hole connecting the outside of the support portion to the inside. The gear housing 62 is a portion that houses the transmission device 3 therein. 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 a first bearing 26 of the motor 2, which will be described later. The first holder 63 is positioned on the left side of the stator 30 described later. As shown in fig. 3, the first holder 63 includes a partition wall 63a, an upper side wall 63h, a support 63c, a plurality of ribs 63g, and a guide wall 65. As shown in fig. 1, the partition wall 63a axially partitions the inside of the motor housing 61 and the inside of the gear housing 62. The partition wall portion 63a is provided with a partition wall opening 63b. The partition wall opening 63b connects the inside of the motor housing 61 with the inside of the gear housing 62.

As shown in fig. 4, the upper side wall 63h protrudes rightward from an upper end of the partition wall 63a, for example. The upper side wall portion 63h is provided with a hole portion 63i. The left end of the first oil ejecting portion 11 is fitted into the hole 63i. The hole 63i is connected to a 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 inside. The support 63c is, for example, an annular shape centered on the motor shaft J1. The support portion 63c protrudes rightward from the partition wall portion 63a, for example. The support 63c has a through hole 63d connecting the outside of the support 63c to the inside. The through hole 63d radially penetrates the support portion 63c from the outer peripheral surface to the inner peripheral surface. In the present embodiment, the through hole 63d extends in the vertical direction. The through hole 63d has an outer opening 63e that opens to the outer peripheral surface of the support 63 c. In the present embodiment, the outer opening 63e is opened at the upper side. The outer opening 63e is opened, for example, immediately above.

The plurality of ribs 63g extend radially outward from the support portion 63 c. A plurality of ribs 63g protrude rightward from the partition wall 63 a. The plurality of ribs 63g are, for example, plate-like with the plate surface facing the circumferential direction. The plurality of ribs 63g are arranged at intervals in the circumferential direction, for example. The plurality of ribs 63g are arranged at equal intervals over the entire circumference, for example, in the circumferential direction.

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

In the present embodiment, the guide wall portion 65 is provided on the upper side wall portion 63h. As shown in fig. 3 and 5, in the present embodiment, the guide wall portion 65 is annular surrounding the first oil ejection portion 11. The inner peripheral surface 65a of the guide wall 65 is, for example, a cylindrical wall surface centered on the center axis J4 of the first oil jet part 11. The central axis J4 is, for example, an imaginary axis parallel to the motor axis J1, and extends in the axial direction. In the present embodiment, the axial direction of the motor shaft J1 corresponds to the axial direction of the center shaft J4. The left side corresponds to "one axial side", and the right side corresponds to "the other axial side".

As shown in fig. 4, the guide wall portion 65 is located, for example, on the right side of the hole portion 63 i. The inside of the guide wall portion 65 is connected to the inside of the hole portion 63i, for example. The guide wall portion 65 has an inner diameter larger than that of the hole portion 63i, for example. In the present embodiment, the guide wall portion 65 is opened in the axial direction of the center axis J4. The guide wall portion 65 is opened, for example, on the right side. The guide wall 65 opens, for example, in the motor housing 61.

As shown in fig. 1, the casing 6 accommodates oil O as a refrigerant therein. In the present embodiment, the oil O is stored in the motor storage 61 and the gear storage 62. An oil reservoir P for storing the oil O is provided in a lower region of the inside of the gear housing 62. The oil O in the oil reservoir P is sent to the inside of the motor housing 61 through an oil passage 90 described later. The oil O fed into the motor housing 61 is stored in a lower region of the motor housing 61. At least a part of the oil O stored in the motor housing 61 moves to the gear housing 62 through the partition wall opening 63b, and returns to the oil reservoir P.

In the present specification, the term "oil is stored in a certain portion" means that the oil is not located in a certain portion as long as the oil is located in a certain portion at least in a part of the motor driving process, and the oil is not located in a certain portion when the motor is stopped. For example, in the present embodiment, the oil O is stored in the motor storage portion 61, and at least a part of the oil O is located in the motor storage portion 61 during driving of the motor 2, and when the motor 2 is stopped, all of the oil O in the motor storage portion 61 can move to the gear storage portion 62 through the partition wall opening 63 b. A part of the oil O supplied to the inside of the motor housing 61 through the oil passage 90 described later may be retained 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 unit 5. Furthermore, the oil O is used for cooling of the motor 2. As the oil O, in order to realize functions of lubricating oil and cooling oil, an oil equivalent to a lubricating oil for an automatic transmission (ATF: automatic Transmission Fluid) having a relatively low viscosity is preferably used.

As shown in fig. 2, the housing 6 has a plurality of contact portions 64 protruding radially inward from the inner peripheral surface of the motor housing portion 61. The contact portion 64 contacts an outer peripheral surface of the stator core body 32a described later. The contact portion 64 has a penetrating groove 64a penetrating 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 is rotatable about a motor shaft 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 includes a rotor core and a rotor magnet fixed to the rotor core. The shaft 21 is centered on the motor shaft J1 and extends in the axial direction. The shaft 21 rotates about the motor shaft J1. The shaft 21 is a hollow shaft having a hollow portion 22 provided therein. The shaft 21 is provided with a communication hole 23. The communication hole 23 extends in the radial direction and connects the hollow portion 22 with the outside of the shaft 21. The shaft 21 extends across the motor housing 61 and the gear housing 62 of the housing 6.

The stator 30 and the rotor 20 are opposed to each other with a gap therebetween in the radial direction. The stator 30 is located at a radially outer side of the rotor 20. The stator 30 has a stator core 32 and a coil assembly 33. The stator core 32 is located radially outward of the rotor 20. The stator core 32 encloses 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 6, the stator core 32 includes a stator core main body 32a and a fixing portion 32b. The outer peripheral surface of the stator core body 32a is, for example, cylindrical with the motor shaft J1 as the center. The fixing portion 32b protrudes radially outward from the outer peripheral surface of the stator core body 32 a. The fixing portion 32b is a portion fixed to the housing 6. The fixing portions 32b are provided in plurality at intervals in the circumferential direction. The fixing portions 32b are provided with four, for example. The four fixing portions 32b are disposed at equal intervals throughout the entire circumference, for example.

In the present embodiment, the fixing portion 32b protruding upward from the stator core body 32a is an upper fixing portion 32f located above the motor shaft J1. In the present embodiment, the fixing portion 32b protruding 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 portion 32b has a fixing hole 32c penetrating the fixing portion 32b in the axial direction. As shown in fig. 2, a bolt 35 extending in the axial direction passes through the fixing hole 32c. The bolt 35 passes through the fixing hole 32c and is screwed into a female screw hole provided in the first holder 63. The fixing portion 32b is fixed to the first holder 63 by the bolt 35 being screwed into the female screw hole.

As shown in fig. 1, the coil assembly 33 has a plurality of coils 31 mounted to a stator core 32 in the circumferential direction. The plurality of coils 31 are mounted on the respective pole teeth of the stator core 32 via insulation members, not shown. The plurality of coils 31 are arranged along the circumferential direction.

The coil block 33 has coil side ends 33a, 33b protruding in the axial direction from the stator core 32. The coil side end 33a is a portion protruding leftward from the stator core 32. The coil side end 33b is a portion protruding rightward from the stator core 32. The coil side end 33a includes a portion of each coil 31 included in the coil assembly 33 protruding leftward from the stator core 32. The coil side end 33b includes a portion of each coil 31 included in the coil assembly 33 protruding rightward from the stator core 32. As shown in fig. 6, in the present embodiment, coil side ends 33a and 33b are annular with a motor shaft J1 as a center. Although not shown, the coil ends 33a and 33b may include a binding member or the like for binding the coils 31, or may include a bonding wire for connecting the coils 31 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 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 the present embodiment, the first bearing 26 supports a portion of the shaft 21 located on the left side of a 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 on the right side of the stator core 32. In the present embodiment, the second bearing 27 supports a portion of the shaft 21 located on the right side of the portion to which the rotor main body 24 is fixed. The second bearing 27 is held inside the support portion of the second holder 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. The torque output from the motor 2 is transmitted to the differential 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. The differential device 5 absorbs the speed difference between the left and right wheels when the vehicle turns, and transmits the same torque to the axles 55 of 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 supplying the oil O from the oil reservoir P to the motor 2 and guiding the oil O to the oil reservoir P again. The oil passage 90 is provided so as to span 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" that forms a flow of oil always in one direction, but also a path that temporarily stagnates oil and a path through which oil supply drops. 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 inside the housing 6, respectively. The first oil passage 91 has a lift path 91a, a shaft supply path 91b, an in-shaft path 91c, and an in-rotor path 91d. Further, 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 reservoir P by the rotation of the ring gear 51 of the differential device 5, and receiving the oil O by the first reservoir 93. In addition, when the liquid surface S of the oil reservoir P is high immediately after the motor 2 is driven, the first reservoir 93 receives the oil O lifted by the second gear 42 and the third gear 43 in addition to the oil O lifted by the ring gear 51. The shaft supply path 91b guides the oil O from the first reservoir 93 to the hollow portion 22 of the shaft 21. The in-shaft path 91c is a path through which the oil supply O passes inside the hollow portion 22 of the shaft 21. The rotor internal path 91d is a path through which the oil supply O passes from the communication hole 23 of the shaft 21 through the inside of the rotor body 24 and is scattered toward the stator 30.

The oil O reaching the stator 30 takes heat from the stator 30. The oil O cooled by the stator 30 is dropped downward and accumulated in a lower region in the motor housing 61. The oil O accumulated in the lower region of the motor housing 61 moves to the gear housing 62 through the partition wall opening 63b provided in the first holder 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 lifted 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 portion 10. The second oil passage 92 has a first flow path 92a, a second flow path 92b, a third flow path 92c, and a fourth flow path 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 a wall portion of the housing 6. The first flow path 92a connects the oil reservoir P to the oil pump 96. The second flow path 92b connects the oil pump 96 to the cooler 97. The third flow path 92c connects the cooler 97 to the fourth flow path 94. The third flow passage 92c is provided in, for example, a wall portion on the front side among the wall portions of the motor housing portion 61. The fourth flow path 94 is provided in the partition wall 63a of the first holder 63. The fourth flow path 94 connects the third flow path 92c to the oil supply portion 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 portion 10 of the present embodiment, the first oil jet portion 11 and the second oil jet portion 12 are pipe members extending in the axial direction. The first oil jet portion 11 and the second oil jet portion 12 are, for example, cylindrical shapes extending straight in the axial direction. The first oil jet part 11 and the second oil jet part 12 are, for example, parallel to each other. As shown in fig. 2, the first oil jet part 11 and the second oil jet part 12 are housed inside the housing 6. The first oil injection portion 11 and the second oil injection portion 12 are located radially outside the stator 30. The first oil injection portion 11 and the second oil injection portion 12 are arranged at intervals in the circumferential direction. The radial position of the first oil ejection portion 11 is, for example, the same as the radial position of the second oil ejection portion 12.

In this specification, the term "certain parameters are identical to each other" includes not only the case where certain parameters are exactly identical to each other but also the case where certain parameters are substantially identical to each other. By "certain parameters are substantially identical to each other" is meant, for example, the case where certain parameters deviate from each other only within a tolerance.

In the present specification, the term "the first oil injection portion and the second oil injection portion extend linearly in the axial direction of the motor shaft" includes not only the case where the first oil injection portion and the second oil injection portion extend strictly linearly in the axial direction but also the case where the first oil injection portion and the second oil injection portion extend substantially 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" may mean that, for example, the first oil injection portion 11 and the second oil injection portion 12 extend slightly inclined with respect to the axial direction. In this case, the inclination direction of the first oil ejecting portion 11 with respect to the axial direction may be the same as or different from the inclination direction of the second oil ejecting portion 12 with respect to the axial direction.

As shown in fig. 6, the first oil jet portion 11 is, for example, cylindrical with a central axis J4 extending in the axial direction as a center and is opened to the left. Although not shown, the first oil ejecting portion 11 is fixed to the housing 6, for example. The first oil ejection portion 11 is located at an upper side than the motor shaft J1. In the present embodiment, the first oil ejection portion 11 is located on the upper side of the stator 30. More specifically, in the present embodiment, the first oil jet portion 11 is located above the upper end portions of the coil side ends 33a and 33 b. The radial position of the first oil ejection portion 11 is, for example, the same as the radial position of the fixed portion 32 b. The first oil ejecting portion 11 is located, for example, on the rear side of the upper fixing portion 32 f.

In addition, in the present specification, the term "a certain object is located on a side of another object in a certain direction" includes the following cases: when a certain object and another object are viewed from one side in a certain direction in a state where the driving device is disposed in a horizontal plane, the certain object and the other object overlap each other, and the certain object is located on the front side of the other object. For example, as in the present embodiment, when the first oil jet part 11 and the stator 30 are viewed from above in a state in which the drive device 1 is disposed on a horizontal plane in a state in which the first oil jet part 11 is located on the upper side of the stator 30, the first oil jet part 11 and the stator 30 overlap each other, and the first oil jet part 11 is located on the front side of 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.

As shown in fig. 4, the left end of the first oil ejecting portion 11 is fitted into the hole portion 63i. The interior of the first oil jet portion 11 is connected to the fourth flow path 94 through the hole 63i. A part of the left side portion of the first oil ejection portion 11 is located inside the guide wall portion 65. As shown in fig. 3, the outer peripheral surface of the first oil jet portion 11 and the inner peripheral surface 65a of the guide wall portion 65 are disposed so as to face each other with a gap therebetween in the radial direction around the central axis J4, for example, over the entire circumference.

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

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

As shown in fig. 6, in the present embodiment, the first oil injection portion 11 has first, second, third, and fourth injection ports 16a, 16b, 13, and 14. The first, second, third, and fourth injection ports 16a, 16b, 13, and 14 are connected to the oil flow path 17. The first, second, third, and fourth injection ports 16a, 16b, 13, and 14 are injection ports that inject the oil O flowing into the oil flow path 17.

The first, second, third, and fourth injection ports 16a, 16b, 13, and 14 are provided on the outer peripheral surface of the first oil injection portion 11. In the present 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 are open to the outer peripheral surface of the first oil injection portion 11, among openings of holes penetrating the wall of the first oil injection portion 11 from the inner peripheral surface to the outer peripheral surface. The first ejection port 16a, the second ejection port 16b, the third ejection port 13, and the fourth ejection port 14 are, for example, circular in shape. The first, second, third, and fourth injection ports 16a, 16b, 13, and 14 are directed downward, for example.

In the present embodiment, a plurality of third injection ports 13 are provided in the left side portion of the first oil injection portion 11 and the right side portion of the first oil injection portion 11, respectively. For example, four third injection ports 13 are provided in a left side portion of the first oil injection portion 11 and a right side portion of the first oil injection portion 11, respectively. The four third injection ports 13 provided at the left side portion of the first oil injection portion 11 are arranged in a zigzag shape in the circumferential direction. The four third injection ports 13 provided at the left side portion of the first oil injection portion 11 include, for example, one third injection port 13 opening directly downward, two third injection ports 13 opening obliquely downward and forward, and one third injection port 13 opening obliquely downward and rearward. The four third injection ports 13 provided at the right side portion of the first oil injection portion 11 are arranged in the same manner as the four third injection ports 13 provided at the left side portion of the first oil injection portion 11 except for the positions in the axial direction thereof.

Four third injection ports 13 provided at the left side portion of the first oil injection portion 11 are located above the coil side end 33 a. Four third injection ports 13 provided at the right side portion of the first oil injection portion 11 are located above the coil side end 33b. Therefore, the oil O ejected from the third ejection port 13 is supplied to the coil side ends 33a, 33b from the upper side. That is, the third injection port 13 injects the oil O as the refrigerant toward the coil side ends 33a and 33b. As described above, in the present embodiment, the first oil injection portion 11 injects the oil O as the refrigerant from the plurality of third injection ports 13 toward the coil side ends 33a, 33b.

In the present embodiment, the fourth injection port 14 is provided at the axial center portion of the first oil injection portion 11. The fourth injection ports 14 are located between the plurality of third injection ports 13 provided at the left side portion of the first oil injection portion 11 and the axial direction of the plurality of third injection ports 13 provided at the right side portion of the first oil injection portion 11. The fourth injection ports 14 are provided in plural at intervals in the axial direction, for example. The fourth ejection openings 14 are provided with two, for example. As shown in fig. 2, the second ejection opening 14 opens obliquely forward, for example, downward. 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 ejected from the fourth ejection port 14 is supplied to the stator core 32 from the upper side. That is, in the present embodiment, the fourth injection port 14 is an injection port that injects the oil O as the refrigerant toward the stator core 32.

In the present specification, the term "the injection port faces downward in the vertical direction" means that the injection port may face downward as long as the injection port faces downward, or the injection port may face in a direction inclined with respect to the straight downward. As described above, in the present embodiment, the third injection ports 13 include the third injection ports 13 directed directly downward, the third injection ports 13 directed in a direction inclined forward with respect to the directly downward, and the third injection ports 13 directed in a direction inclined backward with respect to the directly downward. In the present embodiment, the fourth injection port 14 is inclined obliquely forward with respect to the immediately lower side. In the present embodiment, the term "the fourth injection port 14 is directed downward" may mean that the fourth injection port 14 is directed downward, or that the fourth injection port 14 is directed obliquely backward with respect to the immediately downward direction, for example.

In the present embodiment, the first injection port 16a is provided at the left side portion of the first oil injection portion 11. The first injection ports 16a are located, for example, on the left side of the plurality of third injection ports 13 provided at the left side portion of the first oil injection portion 11. As shown in fig. 3, the first injection port 16a is provided in a portion of the first oil injection portion 11 located inside the guide wall portion 65. The first ejection opening 16a faces directly downward, for example. At least a part of the oil O ejected from the first ejection port 16a is supplied to the first bearing 26.

As shown in fig. 5, the first ejection port 16a faces the inner peripheral surface 65a of the guide wall portion 65 with a gap therebetween. In the present embodiment, the first ejection port 16a is located at a position apart from the upper side of the portion located on the lower side in the inner peripheral surface 65a of the guide wall portion 65. The portion of the inner peripheral surface 65a of the guide wall 65 facing the first ejection port 16a with a gap therebetween is a buffer portion 67. That is, the first holder 63 has the buffer portion 67 facing the first ejection port 16a with a gap therebetween. The guide wall portion 65 has a buffer portion 67. In the present embodiment, the inner peripheral surface 65a of the guide wall portion 65 is a wall surface having the buffer portion 67 in the guide wall portion 65. The buffer 67 covers the first ejection port 16a. In the present embodiment, the buffer 67 covers the first ejection opening 16a from the lower side. The buffer portion 67 includes, for example, a portion located at the lowermost side in the inner peripheral surface 65 a.

The width of the gap between the first injection port 16a and the buffer 67 has a size at least to such an extent that the oil O injected from the first injection port 16a can flow. In the present embodiment, the width of the gap between the first ejection port 16a and the buffer 67 is the distance from the first ejection port 16a to the buffer 67 in the radial direction around the central axis J4, and is the shortest distance between the first ejection port 16a and the buffer 67. The width of the gap between the first injection port 16a and the buffer 67 is 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, for example. The width of the gap between the first injection port 16a and the buffer portion 67 is smaller than the length of the hole having the first oil injection portion 11 as an opening, for example. In the present embodiment, the length of the hole having the first oil ejection portion 11 as the opening is the dimension of the hole in the radial direction around the central axis J4, and is the shortest distance from the inner peripheral surface to the outer peripheral surface of the first oil ejection portion 11 in the portion where the first ejection port 16a is provided. The width of the gap between the first ejection port 16a and the buffer 67 is, for example, less than 1mm.

In the present embodiment, the oil O ejected from the first ejection port 16a is blown to the buffer portion 67 and then diverges into the oil O flowing along the first guide flow path 71 provided in the guide wall portion 65 and the oil O flowing along the second guide flow path 72 provided in the guide wall portion 65. As described above, in the present embodiment, the first holder 63 has the first guide flow path 71 and the second guide flow path 72.

As shown in fig. 3, the first guide flow path 71 is a flow path for guiding the oil O to the first bearing 26. The first guide flow path 71 extends from the buffer 67. In the present embodiment, the first guide flow path 71 is a flow path extending from the buffer 67 to the first bearing 26. In the present embodiment, the first guide flow path 71 extends from the buffer 67 toward the outer opening 63 e. In the present specification, the term "the first guide flow path extends from the buffer portion to a certain object" means that the end portion of the first guide flow path on the opposite side to the side where the buffer portion is connected is closer to the certain object than the buffer portion.

In the present embodiment, the first guide flow path 71 includes a first flow path portion 71a and a second flow path portion 71b. The first flow path portion 71a is provided on the inner peripheral surface 65a of the guide wall portion 65. In other words, the first flow path portion 71a is provided on the wall surface having the buffer portion 67 of the guide wall portion 65. In the present embodiment, the first flow path portion 71a is formed by the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil ejecting portion 11. The first flow path portion 71a extends, for example, from the buffer portion 67 toward the front side and along the circumferential direction around the center axis J4. As shown in fig. 5, the first flow path portion 71a is opened, for example, on the right side.

In the present embodiment, the first flow path portion 71a is located on the upper side as being away from the buffer portion 67 in the circumferential direction around the center axis J4. That is, in the present embodiment, the first flow path portion 71a is located entirely above the buffer portion 67. Thereby, at least a part of the first guide flow path 71 is located above the buffer 67. The first flow path portion 71a is located on the upper side, for example, as it goes 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 from the first flow path portion 71a toward the first bearing 26. In the present embodiment, the second flow path portion 71b is located on the upper side of the first bearing 26. In the present embodiment, the second flow channel portion 71b extends in a direction inclined with respect to the vertical direction. The second flow channel portion 71b extends, for example, in a direction inclined obliquely to the front-rear direction with respect to the vertical direction. The second flow path portion 71b extends obliquely downward and forward from an end portion of the first flow path portion 71a on the opposite side to the side connected to the buffer portion 67, for example. As shown in fig. 5, the second flow path portion 71b is opened, for example, on the right side.

In the present embodiment, the second flow path portion 71b is formed by a hole 65b penetrating the guide wall portion 65. The hole 65b linearly penetrates the guide wall portion 65 from the inner peripheral surface 65a of the guide wall portion 65 to the lower surface of the guide wall portion 65. The lower surface of the guide wall portion 65 constitutes a part of the lower surface of the upper side wall portion 63 h. The hole 65b is opened, for example, on the right side.

An upper end of the second flow path portion 71b is an upper opening portion 71e that opens in a gap between the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil ejecting portion 11. The upper opening 71e is located on the front side and the upper side of the buffer 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 at a front side and a lower side than the upper opening 71e. As shown in fig. 3, in the present embodiment, the lower opening 71d is located above the outer opening 63 e. The lower opening 71d is located, for example, directly above the outer opening 63 e.

A part of the oil O ejected from the first ejection port 16a and blown to the buffer portion 67 flows into the first guide flow path 71 from the first flow path portion 71 a. The oil O flowing into the first guide flow path 71 flows from the first flow path portion 71a to the second flow path portion 71b, and flows out from the lower opening portion 71 d. The oil O flowing out of the first guide flow path 71 drops downward and flows into the through hole 63d through the outer opening 63 e. As a result, in the present embodiment, the first guide flow path 71 guides the oil O to the outer opening 63 e. The oil O flowing into the through hole 63d flows downward through the through hole 63d and is supplied to the first bearing 26. As described above, in the present embodiment, the first guide flow path 71 guides the oil O from the buffer portion 67 to the portion located above the outer opening 63e, thereby guiding the oil O to the first bearing 26.

In the present specification, the term "the first guide flow path guides the oil to the first bearing" means that at least a part of the oil flowing out of the first guide flow path may be supplied to the first bearing, and the first guide flow path may not extend directly to the first bearing. In the present specification, the term "the first guide flow path guides the oil to the first bearing" includes, for example, the following cases: the portion of the first guide flow path from which the oil flows out is located closer to the first bearing than the portion of the first guide flow path from which the oil flows into the first guide flow path or is located at an outer opening of a through hole of a support portion that supports the first bearing. In the present specification, the term "the first guide flow path guides the oil to the first bearing" may mean that a portion of the first guide flow path from which the oil in the first guide flow path flows out is located farther from the first bearing than a portion of the first guide flow path from which the oil flows into the first guide flow path or is located at an outer opening of a through hole of a support portion that supports the first bearing.

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

In the present specification, the term "the second flow path portion extends from the first flow path portion to the first bearing" means that the portion of the second flow path portion from which the oil in the second flow path portion flows out is located closer to the first bearing than the portion of the second flow path portion from which the oil flows into the second flow path portion or at the outer opening portion of the through hole provided in the support portion for supporting the first bearing. In the present embodiment, the portion of the second flow path portion 71b where the oil O flows into the second flow path portion 71b is the upper opening portion 71e. The portion of the second flow path portion 71b from which the oil O in the second flow path portion 71b flows out is a 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 flow path 72 guides the oil O to a position different from the position guided by the first guide flow path 71. In the present embodiment, the second guide flow path 72 guides the oil O to the stator 30. The second guide flow path 72 guides the oil O to the coil edge 33a, for example. The second guide flow path 72 extends from the buffer 67. In the present embodiment, the second guide flow path 72 has a third flow path portion 72a and a fourth flow path portion 72b.

The third flow channel portion 72a is provided on the inner peripheral surface 65a of the guide wall portion 65. In other words, the third flow channel portion 72a is provided on the wall surface having the buffer portion 67 of the guide wall portion 65. In the present embodiment, the third flow passage 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 jet portion 11. The third flow path portion 72a extends rightward from the buffer 67, for example. The third flow path portion 72a is opened, for example, on the right side.

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

A part of the oil O ejected from the first ejection port 16a and blown to the buffer portion 67 flows into the second guide flow path 72 from the third flow path portion 72 a. The oil O flowing into the second guide flow path 72 flows from the third flow path portion 72a to the fourth flow path portion 72b, and flows out from the second guide flow path 72. The oil O flowing out of the second guide flow path 72 drops downward and is supplied from the upper side to the coil side end 33a. As described above, in the present embodiment, the second guide flow path 72 guides the oil O from the buffer portion 67 to the portion located above the coil edge 33a, thereby guiding the oil O to the stator 30.

In the present specification, the term "the second guide flow path guides the oil to a position different from the position to which the first guide flow path is guided" means that the portion of the second guide flow path from which the oil flows out of the second guide flow path is located at a position different from the portion of the first guide flow path from which the oil flows out of the first guide flow path. In the present embodiment, the portion of the second guide flow path 72 from which the oil O flows out of the second guide flow path 72 is the lower end portion of the fourth flow path portion 72 b. The lower end of the fourth flow path portion 72b is located at a position different from the lower opening 71 d.

In the present specification, the term "the second guide flow path guides the oil to the stator" means that at least a part of the oil flowing out of the second guide flow path may be supplied to the stator, and the second guide flow path may not extend directly to the stator. In the present specification, the term "the second guide flow path guides the oil to the stator" includes, for example, the following cases: the portion of the second guide flow path from which the oil in the second guide flow path flows out is located closer to the stator than the portion of the second guide flow path from which the oil flows into the second guide flow path.

In the present embodiment, the portion of the second guide flow path 72 where the oil O flows into the second guide flow path 72 is a portion of the third flow path portion 72a connected to the buffer portion 67. The lower end of the fourth flow path portion 72b is located closer to the stator 30 than the portion of the third flow path portion 72a connected to the buffer portion 67.

As described above, in the present embodiment, the oil O ejected from the first ejection port 16a is branched by the guide wall portion 65, and is supplied to the first bearing 26 and the coil side end 33a, respectively.

As shown in fig. 6, the second injection ports 16b are located, for example, on the right side of the plurality of third injection ports 13 provided on the right side portion of the first oil injection portion 11. The second injection port 16b is provided at the right end of the first oil injection portion 11, for example. In the present embodiment, the second ejection openings 16b are located on the right side of the first ejection openings 16 a. That is, in the present embodiment, the first injection port 16a is located on the upstream side 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 at an upper side than the second bearing 27. At least a part of the oil O ejected from the second ejection port 16b is supplied to the second bearing 27.

The oil O ejected from the second ejection port 16b is ejected to a through hole provided in a support portion, not shown, of the second holder 61 b. Accordingly, the oil O ejected from the second ejection port 16b through the through hole (not shown) is supplied to the second bearing 27 supported on the inner side of the support portion provided in the second holder 61 b. Unlike the first ejection openings 16a, the second ejection openings 16b are not covered by the buffer 67. That is, in the present embodiment, unlike the first holder 63, the second holder 61b does not have the buffer 67. In other words, in the first holder 63 and the second holder 61b, the buffer portion 67 is provided only to the first holder 63.

In the present invention, "the buffer portion is provided only in the first holder" means that the buffer portion is provided in the first holder and the buffer portion is not provided in the second holder, and the buffer portion may be provided in a portion other than the first holder and the second holder.

As shown in fig. 2, the second oil ejection portion 12 is located on the front side of the stator core 32. The entire second oil jet portion 12 overlaps with the shaft 21, for example, when viewed in the front-rear direction. The second oil jet portion 12 is located, for example, at an upper side than the motor shaft J1. The radial position of the second oil ejection portion 12 is, for example, the same as the radial position of the fixed portion 32 b. The second oil ejection portion 12 is located at a lower side than the first oil ejection portion 11. The second oil ejecting portion 12 is located, for example, on the upper side of the front side fixing portion 32 g. The first oil ejecting portion 11 and the second oil ejecting portion 12 are arranged so as to sandwich the upper fixing portion 32f in the circumferential direction.

As shown in fig. 6, the second oil jet portion 12 is, for example, cylindrical extending in the axial direction and opening on the left side. Although not shown, the second oil jet portion 12 is fixed to the housing 6, for example. The right end of the second oil ejection portion 12 is closed. Although not shown, the left end of the second oil jet portion 12 is connected to the fourth flow path 94 through a hole provided in the first holder 63.

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

The second oil injection portion 12 has a plurality of fourth injection ports 15. The oil O flowing into the second oil injection portion 12 is injected from the fourth injection port 15 toward the stator 30. The fourth injection port 15 is provided on the outer peripheral surface of the second oil injection portion 12. The plurality of fourth injection ports 15 are arranged at intervals in the axial direction. The number of fourth injection ports 15 provided in the second oil injection portion 12 is greater than the number of fourth injection ports 14 provided in the first oil injection portion 11. The fourth injection ports 15 are provided with six, for example. The fourth injection port 15 is an opening portion that opens to the outer peripheral surface of the second oil injection portion 12, among opening portions of holes that penetrate the wall portion of the second oil injection portion 12 from the inner peripheral surface to the outer peripheral surface. The fourth ejection port 15 is, for example, circular in shape.

As shown in fig. 2, the second ejection port 15 is directed upward. In the present embodiment, the fourth injection port 15 is directed obliquely rearward on the upper side. The fourth injection port 15 is located on the front side of the stator core 32. The oil O ejected from the fourth ejection port 15 is ejected obliquely upward and backward, and is supplied to the outer peripheral surface of the stator core body 32 a.

In the present specification, the term "the ejection port faces upward" means that the ejection port may face directly upward or may face in a direction inclined with respect to directly upward as long as the orientation of the ejection port includes an upward component. As described above, the fourth ejection port 15 of the present embodiment is directed in a direction inclined obliquely rearward with respect to the immediately upper side. In the present embodiment, the expression "the fourth injection port 15 is directed upward" may mean that the fourth injection port 15 is directed upward, or that the fourth injection port 15 is directed obliquely forward with respect to the upward.

The oil pump 96 shown in fig. 1 is an electric pump that delivers oil O as a refrigerant. The oil pump 96 sucks up the oil O from the oil reservoir 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 fourth flow path 94, and the oil supply portion 10. 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. Further, the oil O can be supplied as lubricating oil from the first oil injection portion 11 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 accumulated in a lower region in the motor housing part 61. Further, the oil O supplied to the first bearing 26 and the second bearing 27 may drop downward and accumulate 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 reservoir P of the gear housing 62 through the partition wall opening 63b provided in the first holder 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 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. A cooling water pipe 98 is connected to the cooler 97, and the cooling water pipe 98 allows cooling water cooled by a radiator, not shown, to pass therethrough. 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 holder 63 that holds the first bearing 26 includes the buffer portion 67 and the first guide flow path 71, wherein the buffer portion 67 faces the first injection port 16a with a gap therebetween and covers the first injection port 16a, and the first guide flow path 71 extends from the buffer portion 67 and guides the oil O to the first bearing 26. Therefore, the oil O ejected from the first ejection port 16a is blown to the buffer portion 67. Thus, the buffer 67 can reduce the potential of the oil O ejected from the first ejection port 16 a. The oil O blown to the buffer 67 and having a lowered momentum can be guided to the first bearing 26 through the first guide flow path 71. Therefore, the oil O supplied to the first bearing 26 can be prevented from splashing on the support portion 63c or the like that supports the first bearing 26, and the oil O can be supplied to the first bearing 26 in a good manner. Therefore, a decrease in the amount of oil O supplied to the first bearing 26 can be suppressed.

In the present embodiment, since the buffer 67 can reduce the potential of the oil O ejected from the first ejection port 16a, the potential of the oil O supplied to the outer opening 63e can be reduced as compared with the case where the oil O is directly blown from the first ejection port 16a to the outer opening 63 e. This can suppress the oil O from splashing on the inner surface of the through hole 63d, and can suppress the oil O from splashing outside the through hole 63 d. Therefore, the oil O flowing out of the first guide flow path 71 can be supplied to the through hole 63d in a satisfactory manner. Therefore, the oil O can be supplied to the first bearing 26 with good efficiency through the through hole 63 d.

Further, according to the present embodiment, the first guide flow path 71 has the first flow path portion 71a and the second flow path portion 71b, wherein the first flow path portion 71a is provided on the wall surface having the buffer portion 67 in the guide wall portion 65, and the second flow path portion 71b is provided on the guide wall portion 65 and extends from the first flow path portion 71a toward the first bearing 26. Therefore, the oil O blown to the buffer portion 67 can easily flow to the first guide flow path 71 via the first flow path portion 71a located on the same wall surface as the buffer portion 67. The second flow path portion 71b can also set the flow direction of the oil O flowing through the first flow path portion 71a to be directed toward the first bearing 26. This makes it possible to easily guide the oil O injected from the first injection port 16a to the buffer 67 to the first bearing 26 via the first guide flow path 71. Therefore, it is possible to further suppress a decrease 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 at an upper side of the first bearing 26, and extends in a direction inclined with respect to the vertical direction. Therefore, for example, the velocity of the oil O flowing through the second flow path portion 71b tends to be reduced by gravity, compared to a case where the second flow path portion 71b extends straight in the vertical direction. This makes it easy to reduce the velocity of the oil O flowing out of the first guide flow path 71. Therefore, the oil O flowing out of the first guide flow path 71 can be further suppressed from splashing on the inner side surface of the through hole 63d or the like. Therefore, the oil O flowing out of the first guide flow path 71 can be supplied to the first bearing 26 in a satisfactory manner. This can further suppress a decrease in the amount of oil O supplied to the first bearing 26.

Further, according to the present embodiment, the guide wall portion 65 is annular surrounding the first oil ejection portion 11. Therefore, the oil O is easily caused 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 ejection portion 11. Thus, for example, when the vehicle on which the drive device 1 is mounted travels on an incline or the like, even if the drive device 1 is tilted so that the position of the second flow path portion 71b is located further upward, the oil O is easily guided to the second flow path portion 71b via the gap between the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil ejection portion 11. Further, the oil O can be stored over the entire circumference of the gap between the inner peripheral surface 65a of the guide wall portion 65 and the outer peripheral surface of the first oil ejection portion 11. Therefore, the oil O that is not completely 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 ejecting portion 11. This can suppress the oil O which is not completely discharged from the second flow path portion 71b from flowing to an unexpected portion.

Further, according to the present embodiment, at least a part of the first guide flow path 71 is located at an upper side than the buffer 67. Therefore, the oil O injected from the first injection port 16a to the buffer 67 flows upward against gravity at least in part while flowing in the first guide flow path 71. Therefore, the velocity of the oil O in the first guide flow path 71 is easily reduced. Therefore, the oil O flowing out of the first guide flow path 71 can be further suppressed from splashing on the inner side surface of the through hole 63d or the like. Therefore, the oil O flowing out of the first guide flow path 71 can be supplied to the first bearing 26 in a satisfactory manner. This can further suppress a decrease in the amount of oil O supplied to the first bearing 26.

Further, according to the present embodiment, the first holder 63 has the second guide flow path 72 extending from the buffer 67. The second guide flow path 72 guides the oil O to a position different from the position at which the first guide flow path 71 guides the oil O. Therefore, a part of the oil O injected from the first injection port 16a to the buffer 67 can be made to flow along the second guide flow path 72. This can suppress an excessive flow rate of the oil O flowing through the first guide flow path 71. Therefore, the oil O flowing in the first guide flow path 71 can be suppressed from excessively increasing in speed. Therefore, the oil O flowing out of the first guide flow path 71 can be further suppressed from splashing on the inner side surface of the through hole 63d or the like. This can further suppress a decrease in the amount of oil O supplied to the first bearing 26. The oil O can also be supplied to a portion different from the first bearing 26 through the second guide flow path 72.

Further, according to the present embodiment, the second guide flow path 72 guides the oil O to the stator 30. Therefore, the amount of oil O supplied to the first bearing 26 can be further suppressed from decreasing, and the stator 30 can be cooled more favorably. In the present embodiment, the oil O can be supplied to the coil side end 33a through the second guide flow path 72 and the third injection port 13, and therefore the coil side end 33a can be cooled well.

Further, according to the present embodiment, the guide wall portion 65 is opened in the axial direction of the central axis J4 of the first oil ejection portion 11. Therefore, a part of the oil O injected from the first injection port 16a to the buffer 67 can be made to flow to the axial opening of the guide wall portion 65. Thus, the second guide flow path 72 as in the present embodiment can be easily provided without providing an additional hole or the like. For example, when the second guide flow path 72 is not provided, a flow path which flows from the buffer portion 67 to the opening in the axial direction of the guide wall portion 65 may be used as at least a part of the first guide flow path. In this case, the hole 65b and the like are not required for providing the second flow path portion 71b as in the present embodiment, and therefore the structure of the housing 6 can be simplified.

Further, according to the present embodiment, the first injection port 16a is located at an upstream side from the second injection port 16b in the flow direction of the oil O in the oil flow path 17. Therefore, it is easy to make the potential of the oil O ejected from the first ejection port 16a larger than the potential of the oil O ejected from the second ejection port 16 b. Thus, the oil O ejected from the first ejection port 16a is more likely to splash at the support portion 63c or the like than the oil O ejected from the second ejection port 16 b. In contrast, according to the present embodiment, since the buffer 67 can reduce the potential of the oil O ejected from the first ejection port 16a, the oil O ejected from the first ejection port 16a can be suppressed from splashing on the support 63c or the like. In this way, when the buffer 67 is provided in the first injection port 16a located upstream of the second injection port 16b, the effect of the buffer 67 of reducing the potential of the oil O can be used more effectively.

Further, according to the present embodiment, in the first holder 63 and the second holder 61b, the buffer 67 is provided only to the first holder 63. Therefore, the structure of the housing 6 can be simplified as compared with the case where the buffer portion 67 is provided in both the first holder 63 and the second holder 61 b. Further, the oil O is supplied from the second injection port 16b located downstream of the first injection port 16a to the second bearing 27 held by the second holder 61 b. The potential of the oil O ejected from the second ejection openings 16b easily becomes smaller than the potential of the oil O ejected from the first ejection openings 16 a. Therefore, the oil O ejected from the second ejection port 16b is less likely to splash at the support portion or the like of the second holder 61b than the oil O ejected from the first ejection port 16 a. Thus, even if the buffer 67 is not provided in the second holder 61b, the amount of the oil O supplied to the second bearing 27 is not easily reduced.

Further, according to the present embodiment, the first holder 63 has the guide rib 63f, and the guide rib 63f extends radially outward from the peripheral edge portion of the outer opening 63e in the outer peripheral surface of the support portion 63 c. Therefore, for example, even when the direction of the oil O flowing out of the outer opening 63e from the first guide flow path 71 is deviated, the oil O is easily guided to the outer opening 63e by the guide rib 63 f. This makes it possible to easily flow the oil O from the first guide flow path 71 to the outer opening 63e, and to easily supply the oil O to the first bearing 26 via the through hole 63 d. Therefore, it is possible to further suppress a decrease in the amount of oil O supplied to the first bearing 26.

For example, when the driving device 1 is inclined due to the vehicle on which the driving device 1 is mounted traveling on an upward slope or the like, the lower opening 71d of the first guide flow path 71 may be positioned directly above the guide rib 63f. In this case, the oil O flowing out from the lower opening 71d drops from the upper side to the guide rib 63f. 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, it is possible to further suppress a decrease in the amount of oil O supplied to the first bearing 26.

(Modification of the first embodiment)

As shown in fig. 7, the first injection port 116a of the first oil injection part 111 of the present modification opens obliquely upward toward the front side. The buffer 167 of the present modification is located on the front side of the first ejection port 116 a. The first channel portion 171a of the first guide channel 171 of the present modification extends downward from the buffer portion 167 in the circumferential direction around the center axis J4. The first flow path portion 171a is located on the rear side as it is directed to the lower side. The lower end of the first flow path 171a is connected to the upper opening 71 e. In the present modification, the entire first guide flow path 171 is located below the buffer 167. Therefore, the oil O ejected from the first ejection port 116a to the buffer 167 can easily flow in the first guide flow path 171 by gravity. Other configurations of the present modification can be the same as those of the above embodiment.

< Second embodiment >

As shown in fig. 8, the guide wall portion 265 of the present embodiment is located below the first oil ejection portion 11. The guide wall portion 265 extends in the circumferential direction around the center axis J4. The guide wall 265 is, for example, a circular arc shape protruding downward when viewed in the axial direction. The upper surface of the guide wall 265 is, for example, a curved surface along the circumferential direction around the center axis J4. In the present embodiment, the buffer portion 267 is provided on the upper surface of the guide wall portion 265. The portion of the guide wall portion 265 located on the front side of the buffer portion 267 has a dimension in the front-rear direction smaller than that of the portion of the guide wall portion 265 located on the rear side of the buffer portion 267. That is, the front end of the guide wall 265 is located closer to the buffer 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 the present embodiment, the first guide channel 271 has a first channel portion 271a and a second channel portion 271b. The first flow channel portion 271a is provided on the upper surface of the guide wall portion 265. In the present embodiment, the upper surface of the guide wall portion 265 is a wall surface having the buffer portion 267 in the guide wall portion 265. The first flow path portion 271a extends from the buffer portion 267 to the front side along the upper surface of the guide wall portion 265. In the present embodiment, the second flow channel portion 271b is formed by the front end surface of the guide wall portion 265. The second flow channel portion 271b extends obliquely downward and forward from the front end of the first flow channel portion 271 a. The other structure of the present embodiment can be the same as the other structure of the first embodiment.

According to the present embodiment, the shape of the guide wall portion 265 can be simplified as compared with a case where the guide wall portion 265 is annular surrounding the first oil ejection portion 11. Therefore, the guide wall portion 265 is easily manufactured. Further, since the second channel portion 271b can be formed by the front end surface of the guide wall portion 265, the first guide channel 271 can be easily formed without requiring a hole or the like in the guide wall portion 265. Further, by providing the front end of the guide wall 265 below the rear end of the guide wall 265, the oil O injected from the first injection port 16a to the buffer 267 can be made to flow easily to the front side. Therefore, the oil O injected from the first injection port 16a to the buffer 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 flow path may have any shape as long as it extends from the buffer portion and can guide the oil to the first bearing. The flow path surface of the first guide flow path may be provided with, for example, a concave-convex shape. According to this configuration, the velocity of the oil flowing through the first guide flow path can be easily reduced by the concave-convex shape. Therefore, the oil supplied from the first guide flow path to the first bearing is more easily prevented from splashing. The entire first guide flow path may be located on the upper side in the vertical direction than the buffer portion. In the second embodiment, the second flow channel portion 271b may be formed by providing a hole in the guide wall portion 265. The first guide flow path may be constituted by only one flow path portion extending in one direction. The buffer portion may be provided to both the first holder and the second holder. In this case, the buffer portion provided in the second holder faces the second ejection port with a gap therebetween, and covers the second ejection port. The shape of the buffer portion is not particularly limited. The buffer portion may be curved, flat, or uneven.

The second guide flow path may be of any shape as long as the oil is guided to a position different from the position at which the first guide flow path guides the oil. The second guide flow path may guide the oil to a portion other than the stator. The second guide flow path may guide oil toward the first bearing. The second guide flow path may not be provided.

In the above embodiment, the first oil ejection portion 11 is provided as the oil ejection portion having the first ejection port 16a covered by the buffer portion 67, but is not limited thereto. For example, the second oil ejection portion 12 of the above embodiment may be an oil ejection portion having a first ejection port covered with a buffer portion. The oil ejection portion having the first ejection port covered by the buffer portion may be provided in plurality. The oil ejection portion may not be a pipe member. In this case, the oil ejecting portion may be formed by providing a hole in the housing. The oil injection portion may not 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 portion of the outer opening portion in the outer peripheral surface of the support portion that supports the first bearing. The guide rib may be provided in plurality. The guide rib may not be provided.

The driving device is not particularly limited as long as it is a device capable of moving an object using a motor as a power source. The drive means 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. In the above embodiment, the case where the driving apparatus 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 driving device may be integrated with the inverter unit.

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

Claims

1. A driving device, characterized by comprising:

a motor having a rotor rotatable about a motor shaft, a stator located radially outward of the rotor, and a first bearing rotatably supporting the rotor;

a first holder that holds the first bearing; and

An oil injection portion having a first injection port that injects oil,

The stator has:

A stator core; and

Coil side ends protruding from the stator core in an axial direction of the motor shaft,

The first holder has:

a buffer portion facing the first injection port with a gap therebetween and covering the first injection port; and

A first guide flow path extending from the buffer portion and guiding oil to the first bearing,

The oil ejecting portion is located radially outside the stator,

The buffer portion is located radially outward of the coil side end.

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

The first holder has a guide wall portion having the buffer portion,

The first guide flow path has:

a first flow path portion provided on a wall surface having the buffer portion, among the guide wall portions; and

And a second flow path portion provided on the guide wall portion and extending from the first flow path portion toward the first bearing.

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

The second flow path portion is located above the first bearing in the vertical direction, and extends in a direction inclined with respect to the vertical direction.

4. A driving device as claimed in claim 2 or 3, characterized in that,

The oil ejecting portion is a pipe member,

The guide wall portion is annular and surrounds the oil ejecting portion.

5. The driving device as claimed in claim 4, wherein,

The guide wall portion is open in an axial direction of a central shaft of the oil ejection portion.

6. A driving device as claimed in any one of claims 1 to 3, characterized in that,

At least a part of the first guide flow path is located above the buffer portion in the vertical direction.

7. A driving device as claimed in any one of claims 1 to 3, characterized in that,

The entire first guide flow path is located at a position lower than the buffer portion in the vertical direction.

8. A driving device as claimed in any one of claims 1 to 3, characterized in that,

The first holder has a second guide flow path extending from the buffer portion,

The second guide flow path guides the oil to a position different from a position at which the first guide flow path guides the oil.

9. The driving device as recited in claim 8, wherein,

The stator and the rotor are opposite to each other with a gap therebetween in the radial direction,

The second guide flow path guides oil to the stator.

10. A driving device as claimed in any one of claims 1 to 3, characterized in that,

The rotor has a second bearing that rotatably supports the rotor,

The first bearing rotatably supports one side of the rotor in the axial direction,

The second bearing rotatably supports the other axial side of the rotor,

The oil ejecting section includes:

an oil flow path for supplying oil to flow; and

A second injection port for injecting oil,

The first injection port and the second injection port are connected to the oil flow path,

At least a part of the oil ejected from the first ejection port is supplied to the first bearing,

At least a part of the oil ejected from the second ejection port is supplied to the second bearing,

The first injection port is located on an upstream side of the second injection port in a flow direction of oil in the oil flow path.

11. The driving device as claimed in claim 10, wherein,

The driving device further includes a second holder that holds the second bearing,

In the first holder and the second holder, the buffer portion is provided only to the first holder.

12. A driving device as claimed in any one of claims 1 to 3, characterized in that,

The first holder has:

an annular support portion that supports the first bearing inside; and

A guide rib extending radially outward from the support portion,

The support portion has a through hole connecting an outer portion of the support portion with an inner portion,

The through hole has an outer opening portion opened in an outer peripheral surface of the support portion,

The first guide flow path guides the oil to the outer opening portion,

The guide rib extends radially outward from a peripheral edge portion of the outer opening portion among outer peripheral surfaces of the support portion.