CN112152341B

CN112152341B - Driving device

Info

Publication number: CN112152341B
Application number: CN202010594465.XA
Authority: CN
Inventors: 津田圭一; 中松修平
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2019-06-28
Filing date: 2020-06-28
Publication date: 2023-08-22
Anticipated expiration: 2040-06-28
Also published as: CN112152341A

Abstract

The present invention provides a driving device, comprising: a motor having a rotor rotatable about a motor axis and a stator located radially outward of the rotor; and a refrigerant flow path through which a refrigerant flows. The stator has a stator core surrounding a rotor. The refrigerant flow path has a 1 st supply port for supplying refrigerant to the stator core on the radial outside of the stator core. The direction of the 1 st supply port opening is a direction inclined radially outward from a direction extending from the 1 st supply port toward the outer peripheral surface of the stator core, as viewed in the axial direction of the motor axis, than a tangential line passing through the 1 st supply port and being tangential to the outer peripheral surface of the stator core.

Description

Driving device

Technical Field

The present invention relates to a driving device.

Background

Rotary electric machines are known in which a stator is cooled by a refrigerant flow path through which a refrigerant flows. For example, japanese patent laying-open No. 2019-9967 discloses a rotary electric machine in which cooling oil is supplied from a plurality of pipes to cool a stator.

In the rotating electrical machine as described above, it is required to cool the stator more effectively by the refrigerant supplied from the refrigerant flow path.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a drive device having a structure capable of improving cooling efficiency of a stator.

One embodiment of the present invention is a driving device including: a motor having a rotor rotatable about a motor axis and a stator located radially outward of the rotor; and a refrigerant flow path through which a refrigerant flows. The stator has a stator core surrounding a rotor. The refrigerant flow path has a 1 st supply port for supplying refrigerant to the stator core on the radial outside of the stator core. The direction of the 1 st supply port opening is a direction inclined radially outward from a direction extending from the 1 st supply port toward the outer peripheral surface of the stator core, as viewed in the axial direction of the motor axis, than a tangential line passing through the 1 st supply port and being tangential to the outer peripheral surface of the stator core.

According to one aspect of the present invention, the cooling efficiency of the stator can be improved in the driving device.

The above and other features, elements, steps, features and advantages of the present invention will be more clearly understood from the following detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.

Drawings

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

Fig. 2 is a perspective view showing the stator, the 1 st tube, and the 2 nd tube according to embodiment 1.

Fig. 3 is a cross-sectional view showing a part of the drive device according to embodiment 1, and is a cross-sectional view taken along line III-III in fig. 1.

Fig. 4 is a cross-sectional view showing a part of the drive device according to embodiment 1, and is a cross-sectional view taken along line IV-IV in fig. 1.

Fig. 5 is a perspective view showing the 1 st pipe of embodiment 1.

Fig. 6 is a view of a part of the stator of embodiment 1, the 1 st tube, and the 2 nd tube as seen from the left side.

Fig. 7 is a view of a part of the stator of embodiment 2, the 1 st tube, and the 2 nd tube from the left side.

Detailed Description

In the following description, the vertical direction is defined based on the positional relationship of the case where the driving device 1 of the present embodiment shown in each figure is mounted on a vehicle on a horizontal road surface, and the description will be made. 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 perpendicular to the Z-axis direction, and is a front-rear direction of a vehicle on which the drive device 1 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 perpendicular to both the X-axis direction and the Z-axis direction, and is a left-right direction of the vehicle, that is, a vehicle width direction. In the following embodiments, the +y side is the left side of the vehicle, and the-Y side is the right side of the vehicle. The front-rear direction and the left-right direction are horizontal directions perpendicular to the vertical direction.

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

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

Embodiment 1

The drive device 1 of the present embodiment shown in fig. 1 is mounted on a vehicle using a motor as a power source, such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an Electric Vehicle (EV), and is used as a power source for these vehicles. As shown in fig. 1, the driving device 1 includes a motor 2, a transmission device 3 including a reduction gear 4 and a differential gear 5, a housing 6, an oil pump 96, a cooler 97, and a pipe 10. In the present embodiment, the drive device 1 does not include an inverter unit. In other words, the drive device 1 and the inverter unit are of a split structure.

The housing 6 houses the motor 2 and the transmission 3 therein. The housing 6 includes a motor housing portion 61, a gear housing portion 62, and a partition wall 61c. The motor housing 61 is a portion that houses the rotor 20 and the stator 30, which will be described later, inside. The gear housing 62 is a portion that houses the transmission device 3 inside. The gear housing 62 is located on the left side of the motor housing 61. The bottom 61a of the motor housing 61 is located above the bottom 62a of the gear housing 62. The partition wall 61c axially divides the inside of the motor housing portion 61 and the inside of the gear housing portion 62. The partition wall 61c is provided with a partition wall opening 68. The partition wall opening 68 connects the inside of the motor housing 61 with the inside of the gear housing 62. The partition wall 61c is located on the left side of the stator 30. That is, in the present embodiment, the partition wall 61c corresponds to an axial wall portion located on one axial side of the stator 30.

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 transported into the motor housing 61 by an oil passage 90 described later. The oil O delivered to the inside of the motor housing 61 is stored in a lower region of the inside of the motor housing 61. At least a part of the oil O stored in the motor housing 61 moves toward the gear housing 62 through the partition wall opening 68 and returns to the oil reservoir P.

In the present specification, the "oil is stored in a certain portion" may be at least a part of the oil in the process of driving the motor, and the oil may be not located in a certain portion when the motor is stopped. For example, in the present embodiment, regarding "oil O is stored in the motor storage portion 61", it is only necessary that 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 may be moved to the gear storage portion 62 through the partition wall opening 68. A part of the oil O that is fed into the motor housing 61 through the oil passage 90 described later may remain in 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. In addition, the oil O is used for cooling the motor 2. As the oil O, an oil equivalent to a lubricating oil (ATF: automatic Transmission Fluid) for an automatic transmission having a relatively low viscosity is preferably used to realize the functions of lubricating oil and cooling oil.

In the present embodiment, the motor 2 is an inner rotor type motor. The motor 2 has a rotor 20, a stator 30 and bearings 26, 27. The rotor 20 is rotatable about a motor 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 includes a rotor core and a rotor magnet fixed to the rotor core. The torque of the rotor 20 is transmitted to the transmission 3.

The shaft 21 extends in the axial direction about the motor axis J1. The shaft 21 rotates around the motor axis J1. The shaft 21 is a hollow shaft provided with a hollow portion 22 inside. The shaft 21 is provided with a communication hole 23. The communication hole 23 extends in the radial direction, connecting 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 left end of the shaft 21 protrudes into the gear housing 62. A 1 st gear 41 of the transmission device 3, which will be described later, is fixed to the left end portion of the shaft 21. The shaft 21 is rotatably supported by bearings 26 and 27.

The stator 30 and the rotor 20 are opposed to each other with a gap therebetween in the radial direction. In more detail, the stator 30 is located radially outside the rotor 20. The stator 30 has a stator core 32 and a coil assembly 33. The stator core 32 surrounds the rotor 20. The stator core 32 is fixed to the inner peripheral surface of the motor housing 61. As shown in fig. 2 and 3, the stator core 32 has a stator core main body 32a and a fixing portion 32b. As shown in fig. 3, the stator core main body 32a has a cylindrical core back portion 32d extending in the axial direction and a plurality of teeth 32e extending radially inward from the core back portion 32 d. The plurality of teeth 32e are arranged at equal intervals over the entire circumference in the circumferential direction.

The fixing portion 32b protrudes radially outward from the outer peripheral surface of the stator core main body 32 a. The fixing portion 32b is a portion fixed to the housing 6. The fixing portions 32b are provided in plurality at intervals in the circumferential direction. For example, 4 fixing portions 32b are provided. The 4 fixing portions 32b are arranged at equal intervals over the entire circumferential direction.

1 of the fixing portions 32b protrudes upward from the stator core main body 32 a. The other one of the fixing portions 32b protrudes downward from the stator core main body 32 a. The other one of the fixing portions 32b is protruded from the stator core main body 32a to the front side (+x side). The remaining 1 fixing portion 32b of the fixing portions 32b protrudes from the stator core main body 32a to the rear side (-X side).

In the following description, the fixing portion 32b protruding upward from the stator core main body 32a is simply referred to as "upper fixing portion 32b", and the fixing portion 32b protruding forward from the stator core main body 32a is simply referred to as "front fixing portion 32b".

As shown in fig. 2, the fixing portion 32b extends in the axial direction. The fixing portion 32b extends from, for example, an end portion on the left side (+y side) of the stator core main body 32a to an end portion on the right side (-Y side) of the stator core main body 32 a. The fixing portion 32b has a through hole 32c penetrating the fixing portion 32b in the axial direction. As shown in fig. 3, the through hole 32c is for the passage of the bolt 34 extending in the axial direction. The bolt 34 is screwed into the female screw hole 35 shown in fig. 4 from the right side (-Y side) through the through hole 32c. The female screw hole 35 is provided in the partition wall 61c. The bolt 34 is screwed into the female screw hole 35, whereby the fixing portion 32b is fixed to the partition wall 61c. Thus, the stator 30 is fixed to the housing 6 by the bolts 34.

As shown in fig. 1, the coil assembly 33 has a plurality of coils 31 mounted on the stator core 32 in the circumferential direction. The plurality of coils 31 are mounted on the respective teeth 32e of the stator core 32 via insulation members not shown. The plurality of coils 31 are arranged in the circumferential direction. More specifically, the plurality of coils 31 are arranged at equal intervals in the circumferential direction over the entire circumference. Although not shown, the coil assembly 33 may have a binding member or the like for binding the coils 31, or may have a bonding wire for connecting the coils 31 to each other.

The coil block 33 has coil ends 33a, 33b protruding in the axial direction from the stator core 32. The coil ends 33a are portions protruding rightward from the stator core 32. The coil end 33b is a portion protruding leftward from the stator core 32. The coil end 33a includes a portion of each coil 31 included in the coil assembly 33 protruding rightward from the stator core 32. The coil end 33b includes a portion of each coil 31 included in the coil assembly 33 protruding leftward from the stator core 32. As shown in fig. 2, in the present embodiment, the coil ends 33a and 33b have an annular shape centered on the motor axis J1. Although not shown, the coil ends 33a and 33b may include a binding member for binding the coils 31, or may include a bonding wire for connecting the coils 31 to each other.

As shown in fig. 1, bearings 26 and 27 rotatably support rotor 20. The bearings 26, 27 are, for example, ball bearings. The bearing 26 is a bearing that rotatably supports a portion of the rotor 20 located on the right side of the stator core 32. In the present embodiment, the bearing 26 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 bearing 26 is held by a wall portion 61b of the motor housing portion 61 that covers the rotor 20 and the right side of the stator 30.

The bearing 27 is a bearing that rotatably supports a portion of the rotor 20 located on the left side of the stator core 32. In the present embodiment, the bearing 27 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 bearing 27 is held by the partition wall 61 c.

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

The reduction gear 4 is connected to the motor 2. The speed reduction device 4 reduces the rotation speed of the motor 2, and increases the torque output from the motor 2 according to the reduction ratio. The reduction gear 4 transmits the torque output from the motor 2 to the differential gear 5. The reduction gear 4 has a 1 st gear 41, a 2 nd gear 42, a 3 rd gear 43, and an intermediate shaft 45.

The 1 st gear 41 is fixed to the outer peripheral surface of the left end portion of the shaft 21. The 1 st gear 41 rotates together with the shaft 21 about the motor axis J1. The intermediate shaft 45 extends along an intermediate axis J2 parallel to the motor axis J1. The intermediate shaft 45 rotates about the intermediate axis J2. The 2 nd gear 42 and the 3 rd gear 43 are fixed to the outer peripheral surface of the intermediate shaft 45. The 2 nd gear 42 and the 3 rd gear 43 are connected via an intermediate shaft 45. The 2 nd gear 42 and the 3 rd gear 43 rotate about the intermediate axis J2. The 2 nd gear 42 is meshed with the 1 st gear 41. The 3 rd gear 43 meshes with a ring gear 51 of the differential device 5, which will be described later.

The torque output from the motor 2 is transmitted to the ring gear 51 of the differential device 5 via the shaft 21, the 1 st gear 41, the 2 nd gear 42, the intermediate shaft 45, and the 3 rd gear 43 in this order. The gear ratio of each gear, the number of gears, and the like can be variously changed according to the reduction ratio required. In the present embodiment, the reduction gear 4 is a parallel axis gear type reduction gear in which the axes of the gears are arranged in parallel.

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

The motor 2 is provided with an oil passage 90 through which the oil supply 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 across the inside of the motor housing 61 and the inside of the gear housing 62.

In the present specification, the "oil passage" refers to a path of oil. Therefore, the "oil passage" is a concept as follows: the "flow path" that generates a flow of oil stably directed in one direction is included, as well as a path where the oil supply temporarily stays and a path where the oil supply drops. The path in which the oil supply temporarily stays includes, for example, a reservoir for storing the oil.

The oil passage 90 has a 1 st oil passage 91 and a 2 nd oil passage 92. The 1 st oil passage 91 and the 2 nd oil passage 92 supply oil O respectively to circulate inside the casing 6. The 1 st oil passage 91 includes a lift path 91a, a shaft supply path 91b, an in-shaft path 91c, and an in-rotor path 91d. Further, a 1 st reservoir 93 is provided in the path of the 1 st oil passage 91. The 1 st reservoir 93 is provided in the gear housing 62.

The lifting path 91a lifts the oil O from the oil reservoir P by the rotation of the ring gear 51 of the differential device 5, and receives the oil O by the 1 st reservoir 93. The 1 st reservoir 93 is open at the upper side. The 1 st reservoir 93 receives the oil O lifted by the ring gear 51. In addition, in a case where the liquid surface S of the oil reservoir P is high immediately after the motor 2 is driven, the 1 st reservoir 93 receives not only the oil O lifted by the ring gear 51 but also the oil O lifted by the 2 nd gear 42 and the 3 rd gear 43.

The shaft supply path 91b guides the oil O from the 1 st 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 in the hollow portion 22 of the shaft 21. The rotor internal path 91d is a path through which the oil is supplied from the communication hole 23 of the shaft 21 and is scattered toward the stator 30 through the inside of the rotor body 24.

In the in-shaft path 91c, centrifugal force is applied to the oil O in the rotor 20, which accompanies the rotation of the rotor 20. Thereby, the oil O continuously flies from the rotor 20 to the radial outside. In addition, as the oil O is scattered, the path inside the rotor 20 becomes negative pressure, and the oil O stored in the 1 st reservoir 93 is sucked into the rotor 20, so that the path inside the rotor 20 is filled with the oil O.

The oil O reaching the stator 30 takes heat from the stator 30. The oil O that cools the stator 30 drops downward and is accumulated in the lower region of the motor housing 61. The oil O accumulated in the lower region of the motor housing 61 moves toward the gear housing 62 through the partition wall opening 68 provided in the partition wall 61 c. As described above, the 1 st oil passage 91 supplies the oil O to the rotor 20 and the stator 30.

In the 2 nd oil passage 92, the oil O is lifted from the oil reservoir P and supplied to the stator 30. The 2 nd oil passage 92 is provided with an oil pump 96, a cooler 97, and the pipe 10. The 2 nd oil passage 92 has a 1 st flow passage 92a, a 2 nd flow passage 92b, a 3 rd flow passage 92c, and a 4 th flow passage 94. In the present embodiment, the tube 10 corresponds to a refrigerant flow path through which the oil O as a refrigerant flows.

The 1 st flow path 92a, the 2 nd flow path 92b, and the 3 rd flow path 92c are provided in the wall portion of the housing 6. The 1 st flow path 92a connects the oil reservoir P to the oil pump 96. The 2 nd flow path 92b connects the oil pump 96 to the cooler 97. The 3 rd flow path 92c connects the cooler 97 to the 4 th flow path 94. The 3 rd flow path 92c is provided, for example, in a wall portion on the front side (+x side) of the wall portion of the motor housing portion 61.

The 4 th flow passage 94 is provided in the partition wall 61c. The 4 th flow path 94 connects the 1 st pipe 11 and the 2 nd pipe 12, which will be described later, of the pipes 10. As shown in fig. 4, the 4 th flow path 94 has an inflow portion 94a, a 1 st branch portion 94c, and a 2 nd branch portion 94f. The inflow portion 94a is a portion of the 4 th flow path 94 into which the oil supply O flows from the 3 rd flow path 92 c. The inflow portion 94a extends from the 3 rd flow path 92c to the rear side (-X side). The inflow portion 94a is located on the front side (+x side) of the shaft 21, and extends linearly in the front-rear direction in the radial direction. The inner diameter of the inflow portion 94a becomes larger at the front end portion. In the present embodiment, the front end of the inflow portion 94a is the radially outer end of the inflow portion 94 a.

The front end (+x side) of the inflow portion 94a is located radially outward of the fixed portion 32 b. The rear (-X side) end of the inflow portion 94a is located radially inward of the fixed portion 32 b. That is, in the present embodiment, the inflow portion 94a extends from a position radially outward of the fixed portion 32b to a position radially inward of the fixed portion 32b in the front-rear direction. The inflow portion 94a is located above the front side (+x side) fixing portion 32 b.

The rear (-X side) end of the inflow portion 94a is a connection portion 94b connecting the 1 st branch portion 94c and the 2 nd branch portion 94 f. The inner diameter of the inflow portion 94a becomes larger at the connecting portion 94b. The connecting portion 94b is located radially inward of the fixing portion 32 b.

The portions of the inflow portion 94a other than the connection portion 94b are formed by drilling from the front side (+x side) of the housing 6. The front end of the inflow portion 94a is closed by screwing a bolt 95 a. The connection portion 94b of the inflow portion 94a is formed by drilling from the left side (+y side) of the partition wall 61 c. Although not shown, the left end of the connecting portion 94b is closed by screwing a bolt.

The 1 st branch portion 94c is a portion branched from the inflow portion 94a and extending to the 1 st pipe 11 described later. The 1 st branch portion 94c extends obliquely upward and rearward from the connecting portion 94b, which is an end of the inflow portion 94a on the rear side (-X side). The 1 st branch portion 94c extends to an upper end portion of the partition wall 61c through a portion of the partition wall 61c located below the upper fixing portion 32b and above the shaft 21. The radial position of the upper end of the 1 st branch portion 94c is substantially the same as the radial position of the fixed portion 32 b. The upper end of the 1 st branch portion 94c is located at a position rearward of the upper fixed portion 32 b.

The 1 st branching portion 94c has: an extension 94d extending in a straight line obliquely upward and rearward from the connection 94 b; and a connecting portion 94e connected to an upper end portion of the extending portion 94 d. The connection portion 94e is an upper end portion of the 1 st branch portion 94c, and is a portion connected to the 1 st pipe 11 described later. The inner diameter of the connecting portion 94e is larger than the inner diameter of the extending portion 94 d. The connection portion 94e is formed by drilling a hole from the upper side of the housing 6 with a drill, for example. The upper end of the connecting portion 94e is closed by screwing a bolt 95 b. The extension 94d is produced by, for example, boring a hole from the upper side of the case 6 to the front side with a drill through the inside of the connection 94 e.

The 2 nd branch portion 94f is a portion branched from the inflow portion 94a and extending to the 2 nd pipe 12 described later. In the present embodiment, the 2 nd branch portion 94f extends obliquely upward from the connecting portion 94b toward the front side. The 2 nd branch portion 94f extends linearly while being inclined toward the right side (-Y side) with respect to the front-rear direction. The radial position of the end portion of the 2 nd branch portion 94f on the front side (+x side) is substantially the same as the radial position of the fixed portion 32 b. The front end (+x side) of the 2 nd branch portion 94f is located above the front fixing portion 32 b. The front end of the 2 nd branch portion 94f is disposed at substantially the same position in the front-rear direction as the front fixed portion 32 b. The 2 nd branch portion 94f is formed by drilling a hole from the left side (+y side) of the partition wall 61c through the inside of the connecting portion 94 b.

In the 4 th flow path 94, a rear portion of the inflow portion 94a, a portion of the extension portion 94d other than the upper end portion, and a rear portion of the 2 nd branch portion 94f are provided in a portion of the partition wall 61c located radially inward of the fixed portion 32 b. That is, in the present embodiment, the 4 th flow path 94 has a portion passing through a position radially inward of the fixed portion 32 b.

As shown in fig. 1, the tube 10 extends in an axial direction. The left end of the tube 10 is fixed to the partition wall 61 c. As shown in fig. 2, the tube 10 includes a 1 st tube 11 and a 2 nd tube 12. That is, the driving device 1 has the 1 st tube 11 and the 2 nd tube 12. In the present embodiment, the 1 st tube 11 corresponds to an upper side refrigerant flow path, and the 2 nd tube 12 corresponds to a lower side refrigerant flow path.

In the present embodiment, the 1 st pipe 11 and the 2 nd pipe 12 are cylindrical and linearly extend in the axial direction. The 1 st pipe 11 and the 2 nd pipe 12 are parallel to each other. As shown in fig. 3, the 1 st pipe 11 and the 2 nd pipe 12 are housed inside the case 6. The 1 st pipe 11 and the 2 nd pipe 12 are located radially outside the stator 30. The 1 st pipe 11 and the 2 nd pipe 12 are arranged at intervals in the circumferential direction. The radial position of the 1 st pipe 11 is, for example, the same as the radial position of the 2 nd pipe 12.

In the present specification, "the 1 st pipe and the 2 nd pipe extend linearly in the axial direction of the motor axis" includes the case where the 1 st pipe and the 2 nd pipe extend substantially linearly in the axial direction, in addition to the case where the 1 st pipe and the 2 nd pipe extend strictly linearly in the axial direction. That is, in the present embodiment, the "1 st pipe 11 and the 2 nd pipe 12 extend linearly in the axial direction" may be, for example, the 1 st pipe 11 and the 2 nd pipe 12 extend slightly inclined with respect to the axial direction. In this case, the direction in which the 1 st pipe 11 is inclined with respect to the axial direction may be the same as or different from the direction in which the 2 nd pipe 12 is inclined with respect to the axial direction.

In the present embodiment, the 1 st pipe 11 is located on the upper side of the stator 30. The 1 st pipe 11 is located above the 2 nd pipe 12. In the present embodiment, the radial position of the 1 st pipe 11 is the same as the radial position of the fixing portion 32 b. The 1 st tube 11 is located at the rear side (-X side) of the upper fixing portion 32 b. As shown in fig. 5, the 1 st pipe 11 has: a 1 st pipe body 11a; a small diameter portion 11b provided at the left (+y side) end of the 1 st pipe body portion 11a; and a small diameter portion 11c provided at the right (-Y side) end of the 1 st pipe body portion 11 a.

The small diameter portion 11b is the left side (+y side) end of the 1 st pipe 11. The small diameter portion 11c is the right (-Y side) end of the 1 st pipe 11. The outer diameters of the small diameter portions 11b, 11c are smaller than the outer diameter of the 1 st pipe main body portion 11 a. The 1 st pipe 11 is fixed to the partition wall 61c so that the small diameter portion 11b is inserted into the partition wall 61c from the right side. The small diameter portion 11b opens to the left. As shown in fig. 4, the small diameter portion 11b opens to the connection portion 94e of the 1 st branch portion 94 c. Thus, the 1 st pipe 11 is connected to the 4 th flow path 94.

As shown in fig. 5, a mounting member 16 is provided at the right (-Y side) end of the 1 st pipe 11. The mounting member 16 has a rectangular plate shape with a plate surface facing in the axial direction. The mounting member 16 has a recess 16a recessed from the left side (+y side) toward the right side. The small diameter portion 11c, which is the right end of the 1 st pipe 11, is fitted and fixed to the recess 16a. The right end of the 1 st pipe 11 is closed by a mounting member 16.

The mounting member 16 has a hole portion 16b penetrating the mounting member 16 in the axial direction. As shown in fig. 2, the hole portion 16b allows the bolt 18 to pass through from the right side (-Y side). The bolt 18 is inserted through the hole 16b and screwed into the protruding portion 61d shown in fig. 3 from the right side. The protruding portion 61d protrudes radially inward on the inner peripheral surface of the motor housing portion 61. The mounting member 16 is fixed to the protruding portion 61d by screwing the bolt 18 into the protruding portion 61d. Thus, the right end of the 1 st pipe 11 is fixed to the motor housing 61 via the mounting member 16.

As shown in fig. 5, the 1 st pipe 11 has a plurality of 1 st upper supply ports 13 and a plurality of 2 nd upper supply ports 14. That is, the tube 10 as the refrigerant flow path has the 1 st upper side supply port 13 and the 2 nd upper side supply port 14. In the present embodiment, the 1 st upper supply port 13 and the 2 nd upper supply port 14 correspond to refrigerant supply ports for supplying the refrigerant to the stator 30. In the present embodiment, the 2 nd upper supply port 14 corresponds to the 2 nd supply port.

The oil O flowing into the 1 st pipe 11 is discharged from the 1 st upper supply port 13 and the 2 nd upper supply port 14. The 1 st upper supply port 13 and the 2 nd upper supply port 14 are provided on the outer peripheral surface of the 1 st pipe 11. The 1 st upper supply port 13 and the 2 nd upper supply port 14 are holes penetrating the 1 st pipe 11 from the inner peripheral surface to the outer peripheral surface. The 1 st upper supply port 13 and the 2 nd upper supply port 14 are, for example, circular. As shown in fig. 2 and 5, the 1 st upper supply port 13 and the 2 nd upper supply port 14 are directed downward.

In the present embodiment, a plurality of 1 st upper supply ports 13 are provided at each of the axial both ends of the 1 st pipe body 11 a. For example, 4 1 st upper supply ports 13 are provided at each of the axial ends of the 1 st pipe body 11 a. The 4 1 st upper supply ports 13 provided at the right (-Y side) end of the 1 st pipe body 11a are arranged in a zigzag manner in the circumferential direction. The 4 1 st upper supply ports 13 provided at the right end of the 1 st pipe main body 11a include 1 st upper supply port 13 opening directly downward, 2 st upper supply ports 13 opening obliquely downward and forward, and 1 st upper supply port 13 opening obliquely downward and rearward. The 4 1 st upper supply ports 13 provided at the left end (+y side) of the 1 st pipe body 11a are arranged in the same manner as the 4 1 st upper supply ports 13 provided at the right part of the 1 st pipe body 11a except for the axial position.

As shown in fig. 2, 4 1 st upper supply ports 13 provided on the right side (-Y side) among the plurality of 1 st upper supply ports 13 are located on the upper side of the coil end 33 a. Of the plurality of 1 st upper supply ports 13, 4 1 st upper supply ports 13 provided on the left side (+y side) are located above the coil end 33b. Therefore, the oil O discharged from the 1 st upper supply port 13 is supplied from the upper side to the coil ends 33a, 33b. That is, in the present embodiment, the 1 st upper supply port 13 is a supply port for supplying the oil O to the coil ends 33a, 33b.

The 2 nd upper supply port 14 is provided in the axial center portion of the 1 st pipe 11. In the present embodiment, 2 nd upper supply ports 14 are provided at an axial center portion of the 1 st pipe body portion 11a at intervals in the axial direction. As shown in fig. 3, in the present embodiment, the 2 nd upper supply port 14 opens obliquely downward and forward. As shown in fig. 2 and 3, the 2 nd upper supply port 14 is located on the upper side of the stator core 32. Accordingly, the oil O discharged from the 2 nd upper side supply port 14 is supplied to the stator core 32 from the upper side. This makes it possible to flow the oil O from the upper side to the lower side of the stator core 32 by gravity. Therefore, the oil O is easily supplied to a wide range of the stator core 32, and the cooling efficiency of the stator 30 can be improved.

In the present embodiment, the oil O injected obliquely forward from the 2 nd upper supply port 14 is blocked by the upper fixing portion 32b, for example, and flows rearward and downward along the outer peripheral surface of the rear portion of the stator core 32. As described above, in the present embodiment, the 2 nd upper supply port 14 is a supply port for supplying the oil O to the stator core 32 on the radial outside of the stator core 32. In the present embodiment, the 2 nd upper supply port 14 is located at the rear side (-X side) of the upper fixing portion 32 b. The oil O ejected obliquely downward and forward from the 2 nd upper supply port 14 may flow rearward without contacting the upper fixing portion 32 b.

In the present specification, "the supply port is directed downward in the vertical direction" means that the supply port may be directed directly downward, or the supply port may be directed obliquely to the directly downward, as long as the supply port includes a downward component. As described above, in the present embodiment, the 1 st upper supply port 13 includes the 1 st upper supply port 13 directed directly downward, the 1 st upper supply port 13 directed in a direction inclined obliquely forward with respect to the directly downward direction, and the 1 st upper supply port 13 directed in a direction inclined obliquely rearward with respect to the directly downward direction. In the present embodiment, the 2 nd upper supply port 14 as the 2 nd supply port is inclined obliquely forward with respect to the immediately lower direction. In the present embodiment, the "2 nd upper supply port 14 is directed downward" may be the 2 nd upper supply port 14 directed, for example, directly downward or directed obliquely rearward with respect to the directly downward direction.

As shown in fig. 6, the direction DI1 in which the 2 nd upper supply port 14 opens is a direction inclined radially inward from the direction in which the 2 nd upper supply port 14 extends toward the outer peripheral surface of the stator core 32, which is the tangential line TL1a passing through the 2 nd upper supply port 14 and being tangential to the outer peripheral surface of the stator core 32, when viewed in the axial direction. Therefore, the oil O ejected from the 2 nd upper supply port 14 can be suppressed from splashing away from the portion to which the oil O is to be supplied. Thereby, the oil O can be appropriately supplied to the stator core 32. Therefore, the cooling efficiency of the stator 30 can be further improved.

In the present embodiment, the direction DI1 in which the 2 nd upper supply port 14 opens is a direction lower than the direction in which the 2 nd upper supply port 14 extends toward the outer peripheral surface of the stator core 32 from the 2 nd upper supply port 14, as viewed in the axial direction, of the tangential line TL1a that is tangential to the outer peripheral surface of the stator core 32 through the 2 nd upper supply port 14. Therefore, the oil O ejected from the 2 nd upper supply port 14 located on the upper side of the stator core 32 can be suppressed from being splashed away from the upper side portion of the stator core 32. In the present embodiment, the oil O ejected from the 2 nd upper supply port 14 can be prevented from splashing forward beyond the upper fixing portion 32 b. Thereby, the oil O from the 2 nd upper supply port 14 can be appropriately supplied to the upper side of the stator core 32. Therefore, the cooling efficiency of the stator 30 can be further improved. The oil O ejected from the 2 nd upper supply port 14 may or may not be supplied to the upper fixing portion 32 b.

In the present embodiment, the tangent line TL1a is, for example, a tangent line tangent to the outer peripheral surface of the upper fixing portion 32b through the center point CP1 provided at the end portion of the outer peripheral surface of the 1 st pipe 11 in the circular 2 nd upper supply port 14. The direction DI1 in which the 2 nd upper supply port 14 opens is a direction in which the 2 nd upper supply port 14 penetrates from the inner peripheral surface to the outer peripheral surface of the 1 st pipe 11. An angle θ1a between a direction DI1 in which the 2 nd upper supply port 14 opens and a direction in which the tangential line TL1a extends from the 2 nd upper supply port 14 toward the outer circumferential surface of the stator core 32 is, for example, 20 ° or more and 45 ° or less. The angle θ1a is the smaller angle of the virtual line L1 and the tangential line TL1a when viewed in the axial direction, and the virtual line L1 extends through the center point CP1 in parallel with the direction in which the 2 nd upper supply port 14 penetrates the 1 st pipe 11.

The direction DI1 in which the 2 nd upper supply port 14 opens is a direction inclined radially inward from the direction in which the 2 nd upper supply port 14 extends toward the outer peripheral surface of the stator core main body 32a, as viewed in the axial direction, than the tangential line TL1b passing through the 2 nd upper supply port 14 and being tangential to the outer peripheral surface of the stator core main body 32 a. In the present embodiment, the direction DI1 in which the 2 nd upper supply port 14 opens is a direction lower than the direction in which the 2 nd upper supply port 14 extends toward the outer peripheral surface of the stator core body 32a from the 2 nd upper supply port 14, as viewed in the axial direction, of the tangential line TL1b passing through the 2 nd upper supply port 14 and being tangential to the outer peripheral surface of the stator core body 32 a. Therefore, the oil O is easily injected from the 2 nd upper supply port 14 toward the stator core main body 32 a. This makes it possible to make the oil O ejected from the 2 nd upper side supply port 14 less likely to pass over the upper side fixing portion 32b. Therefore, the oil O supplied from the 2 nd upper supply port 14 to the stator core 32 can be appropriately made to flow to the rear side portion of the stator core 32.

In the present embodiment, the tangent TL1b is, for example, a tangent to the outer circumferential surface of the cylindrical stator core body 32a through the center point CP1 of the 2 nd upper supply port 14. In the present embodiment, the upper fixing portion 32b is provided at a position where the tangential line TL1b is tangential to the stator core main body 32 a. Therefore, in fig. 6, the outer peripheral surface of the stator core main body 32a is virtually shown by a two-dot chain line at a position where the upper fixing portion 32b is provided. The tangent TL1b is tangent to the outer peripheral surface of the stator core body 32a virtually indicated by the two-dot chain line.

An angle θ1b formed by the direction DI1 in which the 2 nd upper supply port 14 opens and the direction in which the tangential line TL1b extends from the 2 nd upper supply port 14 toward the outer peripheral surface of the stator core main body 32a is, for example, about 10 ° or more and 30 ° or less. The angle θ1b is the smaller angle of the virtual line L1 and the tangential line TL1b when viewed in the axial direction.

As shown in fig. 2 and 3, the 2 nd tube 12 is located at the front side (+x side) of the stator 30. In the present embodiment, the radial position of the 2 nd pipe 12 is the same as the radial position of the fixing portion 32 b. The 2 nd pipe 12 is located on the upper side of the front-side fixing portion 32 b. The fixing portion 32b located on the upper side is located between the 1 st pipe 11 and the 2 nd pipe 12 in the circumferential direction. That is, the 1 st pipe 11 and the 2 nd pipe 12 are arranged with the fixing portion 32b interposed therebetween in the circumferential direction.

As shown in fig. 2, the 2 nd pipe 12 includes a 2 nd pipe main body portion 12a and a small diameter portion 12b provided at an end portion of the left side (+y side) of the 2 nd pipe main body portion 12 a. Although not shown, the 2 nd pipe 12 has a small diameter portion provided at the right (-Y side) end of the 2 nd pipe body 12a, similarly to the 1 st pipe 11.

The small diameter portion 12b is the left side (+y side) end of the 2 nd pipe 12. The small diameter portion 12b has an outer diameter smaller than that of the 2 nd pipe main body portion 12 a. The 2 nd pipe 12 is fixed to the partition wall 61c so that the small diameter portion 12b is inserted into the partition wall 61c from the right side (-Y side). The small diameter portion 12b opens to the left. As shown in fig. 4, the small diameter portion 12b opens to the front side (+x side) end of the 2 nd branch portion 94 f. Thus, the 2 nd pipe 12 is connected to the 4 th flow path 94. Thus, the 1 st pipe 11 and the 2 nd pipe 12 are connected to each other via the 4 th flow path 94. More specifically, the 1 st pipe 11 and the 2 nd pipe 12 are connected to each other via the 1 st branch portion 94c, the connecting portion 94b, and the 2 nd branch portion 94 f.

As shown in fig. 2, a mounting member 17 is provided at the right (-Y side) end of the 2 nd pipe 12. The mounting member 17 has a rectangular plate shape with a plate surface facing in the axial direction. The right end of the 2 nd pipe 12 is fixed to the mounting member 17 in the same manner as the 1 st pipe 11. The right end of the 2 nd pipe 12 is closed by a mounting member 17. Although not shown, the mounting member 17 is bolted to the protruding portion 61e shown in fig. 3, similarly to the mounting member 16. Thus, the right end of the 2 nd pipe 12 is fixed to the motor housing 61 via the mounting member 17. The protruding portion 61e protrudes radially inward on the inner peripheral surface of the motor housing portion 61.

As shown in fig. 2, the 2 nd pipe 12 has a plurality of lower supply ports 15. That is, the tube 10 as the refrigerant flow path has the lower supply port 15. In the present embodiment, the lower supply port 15 corresponds to a refrigerant supply port for supplying the refrigerant to the stator 30. In the present embodiment, the lower supply port 15 corresponds to the 1 st supply port. The oil O flowing into the 2 nd pipe 12 is discharged from the lower supply port 15. The lower supply port 15 is provided on the outer peripheral surface of the 2 nd pipe 12. More specifically, the lower supply port 15 is provided on the outer peripheral surface of the 2 nd pipe body 12 a. The plurality of lower supply ports 15 are arranged at intervals in the axial direction. For example, 6 lower supply ports 15 are provided. The lower supply port 15 is a hole penetrating the 2 nd pipe 12 from the inner peripheral surface to the outer peripheral surface. The lower supply port 15 is, for example, circular.

As shown in fig. 3, the lower supply port 15 is directed upward. Therefore, the oil O discharged upward from the lower supply port 15 can be supplied to the upper portion of the stator 30. This makes it possible to easily cool the entire stator 30 by flowing the oil O from the 2 nd pipe 12 from the upper side to the lower side of the stator 30. In the present embodiment, the lower supply port 15 is inclined rearward to the upper side. Therefore, the oil O discharged from the lower supply port 15 located at the front side of the stator 30 is easily made to reach the upper portion of the stator 30. This facilitates the cooling of the stator 30 by the oil O discharged from the 2 nd pipe 12. The oil O ejected from the lower supply port 15 may or may not be supplied to the upper fixing portion 32 b.

The lower supply port 15 is located on the front side (+x side) of the stator core 32. In the present embodiment, the lower supply port 15 is located below the upper end of the stator core 32. In the present embodiment, the upper end of the stator core 32 is, for example, the upper end of the upper fixing portion 32 b. In the present embodiment, the lower supply port 15 is located below the upper end of the stator core main body 32a and above the motor axis J1.

As shown in fig. 6, the oil O discharged from the lower supply port 15 is ejected obliquely upward and rearward, and supplied to the outer peripheral surface of the stator core main body 32 a. That is, in the present embodiment, the lower supply port 15 is a supply port for supplying the oil O to the stator core 32 on the outer side in the radial direction of the stator core 32.

In the present specification, the "supply port is directed upward" may be directed directly upward or may be directed obliquely with respect to the direction of the directly upward as long as the direction of the supply port includes an upward component. As described above, the lower supply port 15 of the present embodiment is inclined rearward and obliquely with respect to the right upper direction. In the present embodiment, the "lower supply port 15 is directed upward" may be directed, for example, directly upward or directed obliquely forward with respect to the directly upward direction.

The direction DI2 in which the lower supply port 15 opens is a direction inclined radially outward from the direction in which the lower supply port 15 extends toward the outer peripheral surface of the stator core 32, as viewed in the axial direction, than the tangential line TL2 passing through the lower supply port 15 and being tangential to the outer peripheral surface of the stator core 32. Therefore, as shown in fig. 6, the oil O injected from the lower supply port 15 is easily splashed farther than the tangential point TP1 of the tangential line TL2 and the outer circumferential surface of the stator core 32. This makes it possible to easily supply the oil O injected from the lower supply port 15 to a wide range of the stator core 32. Therefore, the cooling efficiency of the stator 30 can be improved.

In the present embodiment, the tangent TL2 is a tangent to the outer circumferential surface of the stator core main body 32a through, for example, a center point CP2 provided at the end portion of the outer circumferential surface of the 2 nd pipe 12 in the circular lower supply port 15. The direction DI2 in which the lower supply port 15 opens is a direction in which the lower supply port 15 penetrates from the inner peripheral surface to the outer peripheral surface of the 2 nd pipe 12. An angle θ2 between a direction DI2 in which the lower supply port 15 opens and a direction in which the tangential line TL2 extends from the lower supply port 15 toward the outer peripheral surface of the stator core 32 is, for example, about 5 ° or more and about 15 ° or less. The angle θ2 is the smaller angle of the virtual line L2 and the tangential line TL2 when viewed in the axial direction, and the virtual line L2 extends through the center point CP2 in parallel with the direction in which the lower supply port 15 penetrates the 2 nd pipe 12.

In the present embodiment, the direction DI2 in which the lower supply port 15 opens is a direction that is higher than the direction in which the tangential line TL2 extends from the lower supply port 15 toward the outer peripheral surface of the stator core 32, as viewed in the axial direction. This facilitates the oil O injected from the lower supply port 15 located below the upper end of the stator core 32 to reach the portion of the stator core 32 located above the tangent point TP1 between the tangent line TL2 and the outer circumferential surface of the stator core 32. This makes it possible to easily and appropriately supply the oil O to the upper portion of the stator core 32, and to easily cool the stator 30. Therefore, the cooling efficiency of the stator 30 can be further improved.

As described above, in the present embodiment, the tube 10 as the refrigerant flow path includes: a 2 nd pipe 12 provided with a lower supply port 15 as a 1 st supply port; and a 1 st pipe 11 provided with a 2 nd upper supply port 14 as a 2 nd supply port, and located above the 2 nd pipe 12. Therefore, the oil O can be appropriately supplied to the upper portion of the stator core 32 by the lower supply port 15 and the 2 nd upper supply port 14. This facilitates the supply of the oil O to the entire stator core 32, and can further improve the cooling efficiency of the stator 30.

Specifically, in the present embodiment, the 1 st pipe 11 is located at the rear side of the upper fixing portion 32 b. Therefore, the oil O discharged from the 2 nd upper supply port 14 of the 1 st pipe 11 easily flows rearward than the upper fixing portion 32 b. This makes it easy to supply the oil O to the rear portion of the stator core 32 by the 1 st pipe 11. On the other hand, the 2 nd pipe 12 is located at a position forward of the upper fixing portion 32 b. Therefore, the oil O discharged upward from the lower supply port 15 of the 2 nd pipe 12 is easily supplied to a portion on the front side of the upper fixing portion 32 b. Thus, the oil O is easily supplied to the front portion of the stator core 32 by the 2 nd pipe 12. Therefore, the 1 st pipe 11 and the 2 nd pipe 12 can easily supply the oil O to both sides of the stator core 32 in the front-rear direction, and the entire stator core 32 can be easily cooled. Therefore, the cooling efficiency of the stator 30 can be further improved.

As shown in fig. 3, a gap G is provided between the inner peripheral surface of the housing 6 and the radial direction of the outer peripheral surface of the stator core 32 in a circumferential region from the lower supply port 15 to a tangential point TP1 at which the tangential line TL2 is tangential to the outer peripheral surface of the stator core 32. Therefore, the path through which the oil O ejected from the lower supply port 15 passes is easily ensured by the gap G. This allows the oil O ejected from the lower supply port 15 to pass through the gap G to reach a position farther than the tangential point TP 1. Therefore, the oil O injected from the lower supply port 15 can be appropriately supplied to a wide range of the stator core 32. Therefore, the cooling efficiency of the stator 30 can be further improved. In the present embodiment, the oil O injected from the lower supply port 15 can be appropriately supplied to the portion of the stator core 32 located above the tangential point TP1 via the gap G. Therefore, the oil O can be appropriately supplied to the upper portion of the stator core 32.

The oil pump 96 shown in fig. 1 is a pump that delivers oil O as a refrigerant. In the present embodiment, the oil pump 96 is an electric pump driven by electricity. The oil pump 96 sucks up the oil O from the oil reservoir P via the 1 st flow path 92a, and supplies the oil O to the motor 2 via the 2 nd flow path 92b, the cooler 97, the 3 rd flow path 92c, the 4 th flow path 94, and the pipe 10. That is, the oil pump 96 feeds the oil O stored in the casing 6 to the 4 th flow path 94, the 1 st pipe 11, and the 2 nd pipe 12. Therefore, the oil O can be easily delivered to the 1 st pipe 11 and the 2 nd pipe 12.

The oil O delivered to the 3 rd flow path 92c by the oil pump 96 flows into the 4 th flow path 94 from the inflow portion 94 a. As shown in fig. 4, the oil O flowing into the inflow portion 94a flows to the rear side (-X side), and branches to flow into the 1 st branch portion 94c and the 2 nd branch portion 94f, respectively. The oil O flowing into the 1 st branch portion 94c flows into the 1 st pipe 11 from the left end (+y side) of the 1 st pipe 11. The oil O flowing into the 1 st pipe 11 flows rightward (-Y side) in the 1 st pipe 11 and is supplied to the stator 30 from the 1 st upper supply port 13 and the 2 nd upper supply port 14. On the other hand, the oil O flowing into the 2 nd branch portion 94f flows into the 2 nd pipe 12 from the left end portion of the 2 nd pipe 12. The oil O flowing into the 2 nd pipe 12 flows rightward in the 2 nd pipe 12 and is supplied from the lower supply port 15 to the stator 30.

In this way, the oil O can be supplied from the 1 st pipe 11 and the 2 nd pipe 12 to the stator 30, and the stator 30 can be cooled. The oil O flowing into the inflow portion 94a can be branched at the 1 st branch portion 94c and the 2 nd branch portion 94f and supplied to the 1 st pipe 11 and the 2 nd pipe 12, respectively. Therefore, compared to the case where the oil O is caused to flow from one pipe 10 to the other pipe 10 of the 1 st pipe 11 and the 2 nd pipe 12, the amount of the oil O supplied to the 1 st pipe 11 is easily suppressed from being deviated from the amount of the oil O supplied to the 2 nd pipe 12. In addition, the path for supplying the oil O to each tube 10 is easily shortened at the same time, so that the temperature of the oil O supplied to the stator 30 is easily maintained relatively low. Therefore, the stator 30 is easily and appropriately cooled.

The oil O supplied from the 1 st pipe 11 and the 2 nd pipe 12 to the stator 30 drops downward and is accumulated 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 68 provided in the partition wall 61 c. As described above, the 2 nd oil passage 92 supplies the oil O to the stator 30.

The cooler 97 shown in fig. 1 cools the oil O passing through the 2 nd oil passage 92. The cooler 97 is connected to the 2 nd and 3 rd channels 92b and 92 c. The 2 nd flow path 92b and the 3 rd flow path 92c are connected via an internal flow path of the cooler 97. A cooling water pipe 98 through which cooling water cooled by a radiator, not shown, passes is connected to the cooler 97. The oil O passing through the cooler 97 is cooled by exchanging heat with the cooling water passing through the cooling water pipe 98.

According to the present embodiment, the 1 st pipe 11 and the 2 nd pipe 12 are connected by the 4 th flow path 94. Therefore, for example, by feeding the oil O to the inflow portion 94a of the 4 th flow path 94 as in the present embodiment, the oil O can be supplied to both the 1 st pipe 11 and the 2 nd pipe 12. That is, the oil passage provided in the housing 6 can be reduced as compared with the case where the oil passages for supplying the oil O to the 1 st pipe 11 and the 2 nd pipe 12 are separately provided. Therefore, the housing 6 can be prevented from being enlarged.

The 4 th flow passage 94 is provided in the partition wall 61c located on the left side of the stator 30. Therefore, the 4 th flow passage 94 can be disposed at a position overlapping the stator 30 in the axial direction. Thus, the 4 th flow passage 94 is easily arranged while avoiding interference with the fixed portion 32b of the stator 30. Further, compared with a case where, for example, the 4 th flow path 94 is provided on the radially outer side of the stator 30, the housing 6 can be suppressed from being enlarged in the radial direction. Further, since the 4 th flow passage 94 is provided in the partition wall 61c of the housing 6, the entire drive device 1 can be easily reduced in size as compared with a case where a flow passage connecting the 1 st pipe 11 and the 2 nd pipe 12 by piping or the like is provided outside the housing 6. Therefore, according to the present embodiment, the driving device 1 can be prevented from being enlarged.

In addition, according to the present embodiment, the 4 th flow path 94 has a portion passing through a position radially inward of the fixed portion 32 b. Therefore, the 4 th flow passage 94 can be easily arranged so as to further avoid the fixed portion 32b, and further, the housing 6 can be prevented from being enlarged in the radial direction. Therefore, the driving device 1 can be further suppressed from becoming larger.

Further, according to the present embodiment, the 1 st pipe 11 and the 2 nd pipe 12 are arranged with the fixing portion 32b interposed therebetween in the circumferential direction. Therefore, the 1 st pipe 11 and the 2 nd pipe 12 can be arranged at positions where they do not interfere with the fixing portion 32b, and the 1 st pipe 11 and the 2 nd pipe 12 can be arranged radially close to the stator core main body 32a. Therefore, the oil O can be easily supplied from the 1 st pipe 11 and the 2 nd pipe 12 to the stator 30, and the driving device 1 can be restrained from being enlarged in the radial direction.

Further, according to the present embodiment, the 1 st pipe 11 and the 2 nd pipe 12 extend linearly in the axial direction. Therefore, compared with the case where the 1 st pipe 11 and the 2 nd pipe 12 are bent and extended in the radial direction or the like, the drive device 1 can be suppressed from being enlarged in the radial direction. Further, since the shape of the 1 st pipe 11 and the shape of the 2 nd pipe 12 can be made simple, the 1 st pipe 11 and the 2 nd pipe 12 can be easily manufactured. Further, the 1 st pipe 11 and the 2 nd pipe 12 are easily disposed to face the stator 30 over a wide range in the axial direction. Therefore, the oil O is easily supplied from the 1 st pipe 11 and the 2 nd pipe 12 to a wide range in the axial direction of the stator 30. Therefore, the stator 30 can be cooled more effectively.

Further, according to the present embodiment, the motor axis J1 extends in the horizontal direction perpendicular to the vertical direction. Therefore, by supplying the oil O from the pipe 10 to the upper side of the stator 30, the oil O can flow from the upper side to the lower side of the stator 30 by gravity. This makes it easy to supply the oil O to the entire stator 30 and to cool the entire stator 30 with the oil O.

In addition, according to the present embodiment, the 1 st upper supply port 13 of the 1 st pipe 11 is a supply port for supplying the oil O to the coil ends 33a, 33 b. Therefore, the coil ends 33a, 33b can be cooled appropriately by the oil O supplied from the 1 st pipe 11. In the present embodiment, the 1 st pipe 11 is located on the upper side of the stator 30, and thus the oil O from the 1 st upper supply port 13 can be supplied from the upper side of the coil ends 33a, 33 b. This makes it possible to flow the oil O from the 1 st upper supply port 13 from the upper side to the lower side of the coil ends 33a and 33b by gravity. Therefore, the oil O is easily supplied to the entire coil ends 33a, 33b, and the entire coil ends 33a, 33b are easily cooled.

Further, according to the present embodiment, the 1 st upper supply port 13 of the 1 st pipe 11 is disposed above each of the coil ends 33a and 33 b. Therefore, the amount of oil O supplied from the 1 st pipe 11 to the coil ends 33a and 33b can be made large. This can properly cool the coil 31 as a heating element, and can cool the stator 30 more favorably.

In addition, according to the present embodiment, the plurality of 1 st upper supply ports 13 located above the coil ends 33a and 33b are arranged in a zigzag manner in the circumferential direction. Therefore, the axial positions of the plurality of 1 st upper supply ports 13 arranged in the circumferential direction are alternately staggered. Thus, the oil O is easily supplied to the entirety of each coil end 33a, 33b, compared to the case where the axial positions of the plurality of 1 st upper supply ports 13 located on the upper side of each coil end 33a, 33b are identical to each other.

In addition, according to the present embodiment, the 1 st upper supply port 13 located above the coil ends 33a and 33b includes the 1 st upper supply port 13 directed obliquely forward downward and the 1 st upper supply port 13 directed obliquely rearward downward. Therefore, the oil O supplied from the plurality of 1 st upper supply ports 13 is easily supplied to both the front and rear portions of the coil ends 33a, 33b, and the oil O is easily supplied to the entire coil ends 33a, 33 b. This can cool the coil ends 33a and 33b better, and thus can cool the stator 30 better.

In addition, according to the present embodiment, the right end of the 1 st pipe 11 is closed by the mounting member 16, and the right end of the 2 nd pipe 12 is closed by the mounting member 17. In the present embodiment, the right end of the 1 st pipe 11 is the end opposite to the side where the oil feed O flows into the 1 st pipe 11. The right end of the 2 nd pipe 12 is an end opposite to the side where the oil supply O flows into the 2 nd pipe 12. That is, the end portion on the opposite side to the side into which the oil supply O flows in the axial end portion of each tube is closed. Therefore, the pressure of the oil O flowing in each pipe is easily increased compared to the case where the end portion on the opposite side to the side where the oil O flows in is opened in the axial end portion of each pipe. This facilitates the strong injection of the oil O from the oil supply ports of the respective tubes. Therefore, the oil O discharged from each oil supply port is easily supplied to the stator 30 appropriately.

In particular, in the 2 nd pipe 12 of the present embodiment, the lower supply port 15 is directed upward. Therefore, the oil O can be strongly injected from the lower supply port 15 to the upper side. This facilitates the oil O discharged from the lower supply port 15 to reach the portion of the stator core 32 located further upward. Therefore, the oil O discharged from the 2 nd pipe 12 is easily supplied to a wide range of the stator core 32, and the stator core 32 can be cooled more effectively.

< embodiment 2 >

As shown in fig. 7, in the stator 130 of the driving device 101 according to the present embodiment, the stator core 132 does not have the fixing portion 32b protruding radially outward. The tube 110 of the present embodiment includes, for example, only the 2 nd tube 112. The 2 nd pipe 112 is disposed at substantially the same position as the upper end of the stator core 132 in the vertical direction. In the present embodiment, the upper end of the stator core 132 is the upper end of the stator core body 32 a. In the present embodiment, the tube 110 corresponds to a refrigerant flow path.

The supply port 115 of the 2 nd pipe 112 is located slightly below the upper end of the stator core 132. In the present embodiment, the supply port 115 corresponds to the 1 st supply port. The supply port 115 is inclined upward toward the front side. The direction DI3 in which the supply port 115 opens is a direction above a direction in which the tangential line TL3 passing through the supply port 115 and tangent to the outer peripheral surface of the stator core 132 extends from the supply port 115 toward the outer peripheral surface of the stator core 132, as viewed in the axial direction. Therefore, the oil O injected from the supply port 115 easily reaches a portion of the stator core 132 located above the tangential point TP2 of the tangential line TL3 and the outer circumferential surface of the stator core 132. In the present embodiment, the oil O injected from the supply port 115 is easily made to reach a position on the rear side of the tangential point TP 2. Therefore, the cooling efficiency of the stator 130 can be improved.

In the present embodiment, the oil O ejected from the supply port 115 is supplied to the top of the stator core main body 32 a. Here, the stator core 132 of the present embodiment does not have the fixing portion 32b protruding radially outward. Therefore, the oil O supplied from the supply port 115 to the outer peripheral surface of the stator core main body 32a is not blocked by the fixing portion 32b and can move in the circumferential direction on the outer peripheral surface of the stator core main body 32 a. Therefore, the oil O supplied to the top of the stator core main body 32a can easily flow along both sides of the outer peripheral surface of the stator core main body 32a in the front-rear direction, and the oil O can easily spread over the entire circumference of the stator core 132. Therefore, the cooling efficiency of the stator 130 can be further improved. In addition, since the entire stator core 132 can be appropriately cooled by only the 2 nd pipe 112, the number of pipes 110 can be reduced, and the number of components of the driving device 101 can be reduced.

In the present embodiment, the tangent TL3 is a tangent to the outer circumferential surface of the stator core main body 32a through, for example, the center point CP3 provided at the end portion of the outer circumferential surface of the 2 nd pipe 112 in the circular supply port 115. The direction DI3 in which the supply port 115 opens is a direction in which the supply port 115 penetrates from the inner peripheral surface to the outer peripheral surface of the 2 nd pipe 112. An angle θ3 formed by the direction DI3 in which the supply port 115 opens and the direction in which the tangential line TL3 extends from the supply port 115 toward the outer peripheral surface of the stator core 132 is, for example, about 15 ° or more and 45 ° or less. The angle θ3 is the smaller angle of the virtual line L3 and the tangential line TL3 when viewed in the axial direction, and the virtual line L3 extends parallel to the direction in which the supply port 115 penetrates the 2 nd pipe 112 through the center point CP 3.

In the present embodiment, the 1 st pipe 11 may be provided as in embodiment 1. Further, the 2 nd pipe 112 may be provided with a supply port for supplying the oil O to the coil ends 33a and 33 b.

The present invention is not limited to the above-described embodiments, and other configurations can be adopted within the scope of the technical idea of the present invention. In the above embodiment, the case where the refrigerant is the oil O has been described, but the present invention is not limited thereto. The refrigerant is not particularly limited as long as it can be supplied to the stator to cool the stator. The refrigerant may be, for example, an insulating liquid or water. In the case where the refrigerant is water, the surface of the stator may be subjected to an insulation treatment.

The refrigerant flow path may have any shape or any arrangement as long as it has the 1 st supply port. The number of 1 st supply ports is not particularly limited as long as it is 1 or more. The number of the 2 nd supply ports is not particularly limited. The 2 nd supply port may not be provided. The shape and size of the 1 st supply port may be different from those of the 2 nd supply port.

In the above embodiment, the lower supply port 15 as the 1 st supply port and the 2 nd upper supply port 14 as the 2 nd supply port are provided in different pipes 10, but the present invention is not limited thereto. The 1 st supply port and the 2 nd supply port may be provided in the same pipe. The refrigerant flow path may be provided with a supply port for supplying oil as a lubricant to a bearing such as a rotor. The refrigerant flow path may not be a tube. In this case, the refrigerant flow path may be a flow path formed by a hole provided in the casing.

The shape of the 1 st tube as the upper refrigerant flow path and the shape of the 2 nd tube as the lower refrigerant flow path are not particularly limited. The 1 st pipe and the 2 nd pipe can be square cylinder. The 1 st pipe and the 2 nd pipe can be bent and extended or can be curved and extended. In the 1 st and 2 nd pipes, the end portion on the opposite side to the side into which the refrigerant flows may be opened.

The flow path connecting the 1 st pipe and the 2 nd pipe may have any shape or may be provided at any position. For example, in the above embodiment, a flow path connecting the 1 st pipe 11 and the 2 nd pipe 12 may be provided in the wall portion 61b located on the right side of the stator 30. The flow path connecting the 1 st pipe and the 2 nd pipe may be, for example, branched pipes. The flow path connecting the 1 st pipe and the 2 nd pipe may not be provided. In this case, the 1 st pipe and the 2 nd pipe may be separately supplied with the refrigerant. The refrigerant flowing into one of the 1 st pipe and the 2 nd pipe may flow into the other of the 1 st pipe and the 2 nd pipe. The pump may also be a mechanical pump. The pump may not be provided.

The driving device is not particularly limited as long as it is a device capable of moving an object to be driven by using a motor as a power source. The drive device may not have a transmission mechanism. The torque of the motor may be directly output from the motor shaft to the target. In this case, the driving device corresponds to the motor itself. The direction in which the motor axis extends is not particularly limited. The motor axis may extend in the vertical direction. In the present specification, the term "the motor axis extends in the horizontal direction perpendicular to the vertical direction" includes a case where the motor axis extends in the substantially horizontal direction in addition to a case where the motor axis strictly extends in the horizontal direction. That is, in the present specification, "the motor axis extends in the horizontal direction perpendicular to the vertical direction" may be that the motor axis is slightly inclined with respect to the horizontal direction. In the above-described embodiment, the case where the driving device does not include the inverter unit has been described, but the present invention is not limited thereto. The drive device may also comprise an inverter unit. In other words, the drive device may be integrally configured 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 described in the present specification can be appropriately combined within a range not contradicting each other.

Claims

1. A driving device is characterized in that,

the driving device comprises:

a motor having a rotor rotatable about a motor axis and a stator located radially outward of the rotor; and

a refrigerant flow path through which a refrigerant flows,

the stator having a stator core surrounding the rotor, the stator core having a stator core body,

the refrigerant flow path has a 1 st supply port that supplies the refrigerant to the stator core body at a radially outer side of the stator core body,

the direction of the 1 st supply port opening is a direction inclined radially outward from a direction extending from the 1 st supply port toward the outer peripheral surface of the stator core main body than a tangential line passing through the 1 st supply port and being tangential to the outer peripheral surface of the stator core main body when viewed in an axial direction of the motor axis,

the motor axis extends in a direction intersecting with the vertical direction,

the 1 st supply port is located at a position lower than an end of the stator core main body at an upper side in a vertical direction,

The 1 st supply port opening direction is a direction that is vertically upward from a direction of the tangential line extending from the 1 st supply port toward the outer peripheral surface of the stator core main body, as viewed in an axial direction of the motor axis.

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

the refrigerant flow path has a 2 nd supply port that supplies the refrigerant to the stator core body at a radially outer side of the stator core body,

the 2 nd supply port is located at an upper side in the vertical direction of the stator core main body.

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

the direction of the 2 nd supply port opening is a direction lower in the vertical direction than a direction extending from the 2 nd supply port toward the outer peripheral surface of the stator core main body, as viewed in the axial direction of the motor axis, of a tangential line passing through the 2 nd supply port and being tangential to the outer peripheral surface of the stator core main body.

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

the refrigerant flow path includes:

a lower refrigerant flow path provided with the 1 st supply port; and

and an upper refrigerant flow path that is located above the lower refrigerant flow path in the vertical direction, and that is provided with the 2 nd supply port.

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

the direction of the 2 nd supply port opening is a direction inclined radially inward from a direction extending from the 2 nd supply port toward the outer peripheral surface of the stator core body, as viewed in an axial direction of the motor axis, than a tangential line passing through the 2 nd supply port and being tangential to the outer peripheral surface of the stator core body.

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

the drive device further has a housing accommodating the motor therein,

in a circumferential region from the 1 st supply port to a tangential point at which the tangential line is tangential to the outer circumferential surface of the stator core body, a gap is provided between the inner circumferential surface of the housing and the radial direction of the outer circumferential surface of the stator core body.

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

the driving device is a driving device mounted on a vehicle,

the drive device further includes a transmission device connected to the motor and transmitting torque of the motor to an axle of the vehicle.