CN113206578A - Drive device - Google Patents

Abstract

The present invention provides a driving device, which is provided with: a motor having a rotor rotatable about a motor shaft extending in a direction intersecting with the vertical direction, and a stator positioned radially outward of the rotor; and a first refrigerant injection portion and a second refrigerant injection portion that are arranged at intervals in the circumferential direction on the outer side in the radial direction of the stator and inject the refrigerant toward the stator. At least one of the first refrigerant injection part and the second refrigerant injection part has an inner injection port that opens obliquely with respect to a side facing the motor shaft, in the circumferential direction, to which the other refrigerant injection part is located. The first refrigerant injection part and the second refrigerant injection part each have an outer injection port that opens obliquely to a side opposite to the side where the other refrigerant injection part is located in the circumferential direction with respect to the direction toward the motor shaft. The total opening area of the outer side injection ports is larger than that of the inner side injection ports.

Description

Drive device

Technical Field

The present invention relates to a drive device.

Background

There is known a rotating electric machine in which a stator is cooled by a refrigerant. For example, patent document 1 describes a rotating electrical machine in which cooling oil is supplied from a plurality of pipes to cool a stator.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2019-9967

Disclosure of Invention

Problems to be solved by the invention

In the rotating electrical machine as described above, it is necessary to more efficiently cool the stator by the refrigerant.

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

Means for solving the problems

One aspect of the driving device of the present invention includes: a motor having a rotor rotatable about a motor shaft extending in a direction intersecting a vertical direction, and a stator positioned radially outward of the rotor; and a first refrigerant injection portion and a second refrigerant injection portion that are arranged at intervals in a circumferential direction on a radially outer side of the stator and inject a refrigerant toward the stator. At least one of the first refrigerant injection part and the second refrigerant injection part has an inner injection port that is inclined in the circumferential direction with respect to the direction toward the motor shaft and opens toward the other refrigerant injection part. The first refrigerant injection part and the second refrigerant injection part each have an outer injection port that is inclined in the circumferential direction toward a side opposite to the side where the other refrigerant injection part is located with respect to the direction toward the motor shaft. The total opening area of the outer ejection openings is larger than the total opening area of the inner ejection openings.

Effects of the invention

According to an aspect of the present invention, the cooling efficiency of the stator can be improved.

Drawings

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

Fig. 2 is a perspective view showing the stator, the first refrigerant injection part, and the second refrigerant injection part of the first embodiment.

Fig. 3 is a view of the stator, the first refrigerant injection portion, and the second refrigerant injection portion of the first embodiment as viewed from above.

Fig. 4 is a sectional view showing a part of the driving device of the first embodiment, and is an IV-IV sectional view in fig. 1.

Fig. 5 is a sectional view showing a part of the first coil end, the first refrigerant injection part, and the second refrigerant injection part of the first embodiment, and is a V-V sectional view in fig. 3.

Fig. 6 is a cross-sectional view showing a part of the first coil end, the first refrigerant injection part, and the second refrigerant injection part in a modification of the first embodiment.

Fig. 7 is a cross-sectional view showing a part of the first coil end, the first refrigerant injection part, and the second refrigerant injection part of the second embodiment.

Fig. 8 is a view of the stator, the first refrigerant injection portion, and the second refrigerant injection portion of the third embodiment as viewed from above.

In the figure:

1-driving device, 2-motor, 11, 111, 211, 311-first refrigerant injection part, 12, 112, 212, 312-second refrigerant injection part, 14a, 14b, 14c, 14d, 114a, 114 b-inner injection port, 15a, 15b, 15c, 15d, 115a, 115b, 215a, 215b, 215e, 215 f-outer injection port, 20-rotor, 30-stator, 31-coil assembly, 31 a-coil, 32-stator core, 33-coil end, 33 a-first coil end, 33 b-second coil end, 33 e-bundling part, 94-refrigerant supply path, CL 3-center line, J1-motor shaft.

Detailed Description

In the following description, the vertical direction is defined based on the positional relationship when the drive device according to 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 embodiments below may satisfy at least a case where the drive device is mounted on a vehicle located 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 vertical upper side is simply referred to as "upper side", and the vertical lower side is 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 driving 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 lateral direction, i.e., 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-back 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 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 shaft J1 shown in each figure as appropriate extends in a direction intersecting the vertical direction. More specifically, the motor shaft J1 extends in the Y-axis direction orthogonal to the vertical direction, i.e., in the lateral direction of the vehicle. In the following description, unless otherwise specified, a direction parallel to the motor shaft J1 is simply referred to as "axial direction", a radial direction centering on the motor shaft J1 is simply referred to as "radial direction", and a circumferential direction centering on the motor shaft J1, that is, an axis around the motor shaft J1 is simply referred to as "circumferential direction". In the present specification, the "parallel direction" also includes a substantially parallel direction, and the "orthogonal direction" also includes a substantially orthogonal direction.

In the following embodiments, the + Y side, i.e., the left side, corresponds to one axial side, and the-Y side, i.e., the right side, corresponds to the other axial side. The vertical direction corresponds to a direction orthogonal to the axial direction of the motor shaft J1.

< first embodiment >

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

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

The casing 6 internally accommodates oil O as a refrigerant. In the present embodiment, oil O is contained in the motor containing section 61 and the gear containing section 62. An oil sump P for storing oil O is provided in a lower region inside the gear housing 62. The oil O in the oil sump P is fed to the inside of the motor housing 61 through an oil passage 90 described later. The oil O sent 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 to the gear housing 62 through the partition opening 63a and returns to the oil reservoir P.

In the present specification, the phrase "oil is contained in a certain portion" means that the oil is only required to be contained in the certain portion at least in a part during driving of the motor, and the oil may not be contained in the certain portion when the motor is stopped. For example, in the present embodiment, the fact that the oil O is contained in the motor housing portion 61 means that the oil O may be located in the motor housing portion 61 at least in part during driving of the motor 2, and the oil O in the motor housing portion 61 may be entirely moved to the gear housing portion 62 through the partition wall opening 63a when the motor 2 is stopped. A part of the oil O fed to the inside of the motor housing portion 61 through an oil passage 90 described later may be left inside the motor housing portion 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 lubricating the reduction gear 4 and the differential 5. In addition, the oil O is used for cooling the motor 2. As the oil O, in order to function as a lubricating oil and a cooling oil, it is preferable to use an oil equivalent to an Automatic Transmission lubricating oil (ATF) having a low viscosity.

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 and 27. The rotor 20 is rotatable about a motor shaft J1 extending in the horizontal direction. The rotor 20 has a shaft body 21 and a rotor main 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 device 3.

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

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

The stator 30 is opposed to the rotor 20 with a gap 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 block 31. The stator core 32 surrounds the rotor 20. The stator core 32 is fixed to the inner peripheral surface of the motor housing 61. As shown in fig. 2 and 3, the stator core 32 includes a stator core main body 32a and a fixing portion 32 b. Although not shown, the stator core main body 32a has a cylindrical core back extending in the axial direction and a plurality of teeth extending radially inward from the core back. The plurality of teeth are arranged at equal intervals along the circumferential direction over a circumference.

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

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

The fixing portion 32b extends in the axial direction. The fixing portion 32b extends, for example, from 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 that penetrates the fixing portion 32b in the axial direction. Although not shown, a bolt extending in the axial direction is inserted into the through hole 32 c. The bolt is inserted through the through hole 32c from the right side (the (-Y side), for example, and screwed into a female screw hole provided in the partition wall 63. Thereby, the fixing portion 32b is fixed to the partition wall 63. Thus, the stator 30 is fixed to the housing 6 by bolts.

The coil block 31 is attached to the stator core 32. As shown in fig. 1, the coil assembly 31 has a plurality of coils 31a attached to the stator core 32 along the circumferential direction. The plurality of coils 31a are attached to the respective teeth of the stator core 32 via insulators not shown. The plurality of coils 31a are arranged along the circumferential direction. More specifically, the plurality of coils 31a are arranged at equal intervals along the circumferential direction over one circumference.

The coil block 31 has coil ends 33 projecting from the stator core 32 in the axial direction. In the present embodiment, the coil end 33 includes a first coil end 33a and a second coil end 33 b. The first coil end 33a protrudes leftward from the stator core 32. The second coil end 33b protrudes from the stator core 32 to the right side. As shown in fig. 2, the first coil end 33a and the second coil end 33b are annular around the motor axis J1. More specifically, the first coil end 33a and the second coil end 33b are annular around the motor axis J1.

The first coil end 33a has a body portion 33c and a binding member 33 e. The second coil end 33b includes a body portion 33d and a binding member 33 e. The body portions 33c and 33d are annular around the motor shaft J1. The body portion 33c has a portion of the plurality of coils 31a that protrudes to the left of the stator core 32. The body portion 33d has a portion of the plurality of coils 31a that protrudes to the right of the stator core 32. The main bodies 33c and 33d may have jumper wires connecting the coils 31a to each other.

The binding member 33e is wound around a part of the annular body portions 33c and 33d in the circumferential direction, and binds the body portions 33c and 33 d. That is, the binding member 33e binds the coil 31 a. In the present embodiment, the body portion 33c of the first coil end 33a and the body portion 33d of the second coil end 33b are provided with a plurality of binding members 33e at intervals along the entire circumferential direction. The cross-sectional shape of the binding member 33e is not particularly limited. The cross-sectional shape of the binding member 33e is, for example, a circular shape. The material of the binding member 33e is not particularly limited. The material of the binding member 33e is, for example, resin. When the body portions 33c and 33d have jumper wires for connecting the coils 31a to each other, the binding member 33e may bind a part of the coil 31a and the jumper wires together.

As shown in fig. 1, the bearings 26, 27 rotatably support the 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 body 21 located on the right side of the portion where the rotor body 24 is fixed. The bearing 26 is held by a wall portion 61b of the motor housing 61 that covers the right side of the rotor 20 and the stator 30.

The bearing 27 is a bearing that rotatably supports a portion of the rotor 20 on the left side of the stator core 32. In the present embodiment, the bearing 27 supports a portion of the shaft body 21 on the left side of the portion to which the rotor body 24 is fixed. The bearing 27 is held by the partition wall 63.

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 body 21. The transmission device 3 has a reduction gear 4 and a differential device 5. The torque output from the motor 2 is transmitted to the differential device 5 via the reduction gear device 4.

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

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

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

The differential device 5 is connected to the motor 2 via the reduction gear 4. The differential device 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle. The differential device 5 transmits the same torque to the axles 55 of the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle turns. In this way, 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 gear 4 and the differential device 5. The differential device 5 includes a ring gear 51, a gear housing, a pair of pinions, a pinion shaft, and a pair of side gears. The ring gear 51 rotates about a differential shaft J3 parallel to the motor shaft J1. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4.

The motor 2 is provided with an oil passage 90 for circulating oil O inside the casing 6. The oil passage 90 is a path of the oil O that supplies the oil O from the oil sump P to the motor 2 and is guided to the oil sump 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 addition, in this specification, "oil passage" refers to a path of oil. Therefore, the concept of the "oil passage" includes not only a "flow passage" for realizing a constant flow of oil in one direction but also a path for temporarily retaining the oil and a path for dropping the oil. The path for temporarily retaining the oil includes, for example, a reservoir for storing the oil.

The oil passage 90 has a first oil passage 91 and a second oil passage 92. The first oil passage 91 and the second oil passage 92 circulate oil O inside the casing 6. The first oil passage 91 has a lift path 91a, a shaft body supply path 91b, a shaft body inner path 91c, and a rotor inner path 91 d. Further, a first reservoir 93 is provided in a path of the first oil path 91. The first reservoir 93 is provided in the gear housing portion 62.

The lift path 91a is a path that lifts oil O from the oil sump P by rotation of the ring gear 51 of the differential device 5 and receives the oil O in the first reservoir 93. The first reservoir 93 opens to the upper side. The first reservoir 93 receives oil O kicked up by the ring gear 51. Further, in the case where the liquid level S of the oil sump P is high, for example, immediately after the motor 2 is driven, the first reservoir 93 receives the oil O raised by the second gear 42 and the third gear 43 in addition to the ring gear 51.

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

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

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

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

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

In the present embodiment, the refrigerant supply passage 94 is provided in the partition wall 63. The refrigerant supply passage 94 connects the first refrigerant injection portion 11 and the second refrigerant injection portion 12. That is, the refrigerant supply passage 94 is connected to both the first refrigerant injection part 11 and the second refrigerant injection part 12. As shown in fig. 4, in the present embodiment, the refrigerant supply passage 94 includes a first extending portion 94a, a second extending portion 94b, and a connecting portion 94 c. The first extension 94a extends upward from the end of the third flow path 92 c. The end of the third flow path 92c is located below and forward of the motor shaft J1. The first extension 94a passes through the front side of the motor shaft J1 and extends from a position below the motor shaft J1 to a position above the motor shaft J1. The first extending portion 94a extends linearly, for example, obliquely in the front-rear direction with respect to the vertical direction. The first extension 94a is located on the rear side, for example, as facing the upper side. The upper end of the first extending portion 94a is located above the shaft body 21. A connecting portion 94c is provided at an upper end of the first extending portion 94 a.

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

A hole portion 94d connected to the first refrigerant ejection portion 11 and a hole portion 94e connected to the second refrigerant ejection portion 12 are provided in a right side (-Y side) portion of the inner surface of the second extension portion 94 b. Thereby, the second extension 94b is connected to both the first refrigerant injection part 11 and the second refrigerant injection part 12. Hole 94d is located on the front side of motor shaft J1. Hole 94e is located on the rear side of motor shaft J1. Although not shown, the holes 94d and 94e are open inside the motor housing 61.

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

As shown in fig. 1, the first refrigerant injection portion 11 and the second refrigerant injection portion 12 are housed inside the casing 6. As shown in fig. 2, in the present embodiment, the first refrigerant injection part 11 and the second refrigerant injection part 12 are tubes. The first refrigerant injection part 11 and the second refrigerant injection part 12 are, for example, cylindrical shapes extending linearly in the axial direction.

In the present specification, the phrase "the first refrigerant injecting portion and the second refrigerant injecting portion extend linearly in the axial direction of the motor shaft" includes a case where the first refrigerant injecting portion and the second refrigerant injecting portion extend linearly substantially in the axial direction, in addition to a case where the first refrigerant injecting portion and the second refrigerant injecting portion extend linearly in the axial direction. That is, in the present embodiment, "the first refrigerant ejection portion 11 and the second refrigerant ejection portion 12 extend linearly in the axial direction" may be, for example, such that the first refrigerant ejection portion 11 and the second refrigerant ejection portion 12 extend slightly obliquely with respect to the axial direction. In this case, the direction in which the first refrigerant injection part 11 is inclined with respect to the axial direction and the direction in which the second refrigerant injection part 12 is inclined with respect to the axial direction may be the same or different.

In the present embodiment, the first refrigerant injection portion 11 and the second refrigerant injection portion 12 extend in parallel directions to each other. The first refrigerant injection portion 11 and the second refrigerant injection portion 12 are arranged at intervals in the circumferential direction on the radially outer side of the stator 30. In the present embodiment, the first refrigerant injection portion 11 and the second refrigerant injection portion 12 are positioned on the upper side of the stator 30 in the vertical direction.

Further, in the present specification, "an object is located on a predetermined direction side of another object" includes the following cases: when a certain object and another object are viewed from a predetermined direction side in a state where the driving device is arranged on a horizontal plane, the certain object and the another object overlap each other, and the certain object is located on a front side of the another object. That is, as shown in fig. 3, in the present embodiment, when the first refrigerant injection portion 11, the second refrigerant injection portion 12, and the stator 30 are viewed from the upper side in the vertical direction in a state where the driving device 1 is disposed on a horizontal plane, the first refrigerant injection portion 11, the second refrigerant injection portion 12, and the stator 30 overlap each other, and the first refrigerant injection portion 11 and the second refrigerant injection portion 12 are located on the front side of the stator 30. In the present specification, the phrase "a state in which the driving device is disposed on a horizontal plane" includes a case in which a vehicle mounted with the driving device is disposed on a horizontal road surface.

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

As shown in fig. 5, the vertical position of the first refrigerant injection portion 11 and the vertical position of the second refrigerant injection portion 12 are, for example, the same as each other. The radial position of the first refrigerant ejection portion 11 and the radial position of the second refrigerant ejection portion 12 are, for example, the same as each other. In the present embodiment, the first refrigerant injection portion 11 and the second refrigerant injection portion 12 are disposed so as to sandwich the center line CL3 as viewed in the axial direction. The center line CL3 is an imaginary line that passes through the motor shaft J1 and extends in the vertical direction when viewed in the axial direction. The center line CL3 extends parallel to the vertical direction. The first refrigerant injection portion 11 and the second refrigerant injection portion 12 are arranged line-symmetrically with respect to the center line CL3 as viewed in the axial direction.

As shown in fig. 2, the left end of the first refrigerant injection part 11 and the left end of the second refrigerant injection part 12 are open. The right end of the first refrigerant injection part 11 and the right end of the second refrigerant injection part 12 are closed. As shown in fig. 3, the dimension in the axial direction of the first refrigerant injection portion 11 and the dimension in the axial direction of the second refrigerant injection portion 12 are, for example, the same as each other. The axial position of the left end of the first refrigerant injection part 11 and the axial position of the left end of the second refrigerant injection part 12 are, for example, the same as each other. The axial position of the right end of the first refrigerant injection part 11 and the axial position of the right end of the second refrigerant injection part 12 are, for example, the same as each other. However, the dimension in the axial direction of the first refrigerant injection portion 11 and the dimension in the axial direction of the second refrigerant injection portion 12 may also be different from each other.

As shown in fig. 1, the left end of the first refrigerant ejection part 11 and the left end of the second refrigerant ejection part 12 are fixed to the partition wall 63. The left end of the first refrigerant injection part 11 is fixed to the partition wall 63 by, for example, being inserted into a hole 94d provided in the partition wall 63. The left end of the second refrigerant injecting portion 12 is fixed to the partition wall 63 by, for example, being inserted into a hole 94e provided in the partition wall 63. The right end of the first refrigerant injection portion 11 and the right end of the second refrigerant injection portion 12 are fixed to the upper wall portion of the motor accommodating portion 61 via, for example, unillustrated mounting portions.

As shown in fig. 3, the first refrigerant injecting portion 11 has first injection ports 13a, inner injection ports 14, and outer injection ports 15. The second refrigerant injecting portion 12 has second injection ports 13b, inner injection ports 14, and outer injection ports 15. That is, in the present embodiment, the first refrigerant ejection portion 11 and the second refrigerant ejection portion 12 have the inner ejection port 14 and the outer ejection port 15, respectively. The inner injection ports 14 of the first refrigerant injection portion 11 include inner injection ports 14a and inner injection ports 14 c. The outer injection ports 15 of the first refrigerant injection portion 11 include outer injection ports 15a and outer injection ports 15 c. The inner injection ports 14 of the second refrigerant injection portion 12 include inner injection ports 14b and inner injection ports 14 d. The outer injection ports 15 of the second refrigerant injection portion 12 include outer injection ports 15b and outer injection ports 15 d. In the present embodiment, four inner injection ports 14 and four outer injection ports 15 are provided, respectively.

The first injection ports 13a, the inner injection ports 14a, 14c, and the outer injection ports 15a, 15c are provided on the outer surface of the first refrigerant injecting portion 11. The second injection ports 13b, the inner injection ports 14b, 14d, and the outer injection ports 15b, 15d are provided on the outer surface of the second refrigerant injecting portion 12. Each of the ejection ports has, for example, a circular shape.

The oil O supplied from the refrigerant supply passage 94 to the inside of the first refrigerant ejection part 11 and the inside of the second refrigerant ejection part 12 is ejected from the respective ejection ports provided in the first refrigerant ejection part 11 and the second refrigerant ejection part 12. In the present embodiment, each of the injection ports provided in the first refrigerant injection portion 11 and the second refrigerant injection portion 12 is an opening portion that opens on the outer peripheral surface of each refrigerant injection portion, among opening portions of holes that penetrate the wall portion of each refrigerant injection portion from the inner peripheral surface to the outer peripheral surface.

Specifically, as shown in fig. 5, the inner injection port 14a is an opening portion that opens on the outer peripheral surface of the first refrigerant injecting portion 11, among opening portions of a hole 16a that penetrates the wall portion of the first refrigerant injecting portion 11 from the inner peripheral surface to the outer peripheral surface. The inner injection port 14b is an opening portion that opens on the outer peripheral surface of the second refrigerant injecting portion 12, among opening portions of a hole 16b that penetrates the wall portion of the second refrigerant injecting portion 12 from the inner peripheral surface to the outer peripheral surface. The outer injection port 15a is an opening portion that opens on the outer peripheral surface of the first refrigerant injecting portion 11, among opening portions of a hole 17a that penetrates the wall portion of the first refrigerant injecting portion 11 from the inner peripheral surface to the outer peripheral surface. The outer injection port 15b is an opening portion that opens on the outer peripheral surface of the second refrigerant injecting portion 12, among opening portions of a hole 17b that penetrates the wall portion of the second refrigerant injecting portion 12 from the inner peripheral surface to the outer peripheral surface.

As shown in fig. 3, the first injection ports 13a and the second injection ports 13b are located above the stator core 32. More specifically, the first injection ports 13a and the second injection ports 13b are located above the stator core main body 32 a. The first injection ports 13a and the second injection ports 13b are disposed symmetrically with respect to the motor shaft J1 as viewed in the vertical direction. The oil O injected from the first injection ports 13a and the second injection ports 13b is supplied to the stator core 32. The first injection ports 13a and the second injection ports 13b are provided in plurality at intervals in the axial direction. For example, four first injection ports 13a and four second injection ports 13b are provided. The opening areas of the first ejection openings 13a and the opening areas of the second ejection openings 13b are, for example, the same as each other.

The inner ports 14a and 14b and the outer ports 15a and 15b are located above the first coil end 33 a. The inner ejection ports 14c and 14d and the outer ejection ports 15c and 15d are located above the second coil end 33 b. The inner injection port 14a and the outer injection port 15a are located on the left side of the first injection port 13a in the first refrigerant injecting portion 11. The inner injection port 14c and the outer injection port 15c are located on the right side of the first injection port 13a in the first refrigerant injecting portion 11. The inner injection port 14b and the outer injection port 15b are located on the left side of the second injection port 13b in the second refrigerant injecting portion 12. The inner injection ports 14d and the outer injection ports 15d are located on the right side of the second refrigerant injection portion 12 with respect to the second injection ports 13 b.

In the present embodiment, the axial position of the inner injection ports 14a, the axial position of the inner injection ports 14b, the axial position of the outer injection ports 15a, and the axial position of the outer injection ports 15b are the same as each other. In the present embodiment, the axial position of the inner injection ports 14c, the axial position of the inner injection ports 14d, the axial position of the outer injection ports 15c, and the axial position of the outer injection ports 15d are the same as each other.

The inner injection ports 14a and 14b and the outer injection ports 15a and 15b are disposed at positions overlapping the axial center line CL1 of the first coil end 33a as viewed in the vertical direction. The axial center line CL1 is an imaginary line that passes through the center of the axial direction of the first coil end 33a and extends in the front-rear direction when viewed in the vertical direction. As described above, the inner injection ports 14a and 14b and the outer injection ports 15a and 15b overlap the first coil end 33a as viewed in a direction orthogonal to the axial direction of the motor shaft J1, and are arranged at the same position as the center of the first coil end 33a in the axial direction of the motor shaft J1.

The inner injection ports 14c and 14d and the outer injection ports 15c and 15d are disposed on the left side of the axial center line CL2 of the second coil end 33b as viewed in the vertical direction. The axial center line CL2 is an imaginary line that passes through the center of the second coil end 33b in the axial direction and extends in the front-rear direction when viewed in the vertical direction. As described above, the inner injection ports 14c and 14d and the outer injection ports 15c and 15d overlap the second coil end 33b as viewed in a direction orthogonal to the axial direction of the motor shaft J1, and are arranged closer to the stator core 32 than the center of the second coil end 33b in the axial direction of the motor shaft J1.

The inner ports 14a, 14b and the outer ports 15a, 15b are opened toward the first coil end 33 a. The inner ejection ports 14c and 14d and the outer ejection ports 15c and 15d are opened toward the second coil end 33 b. That is, in the present embodiment, the inner injection ports 14 and the outer injection ports 15 open to the coil ends 33 in both the first refrigerant injection part 11 and the second refrigerant injection part 12. The oil O injected from the inner injection ports 14a, 14b and the outer injection ports 15a, 15b is supplied to the first coil end 33 a. The oil O injected from the inner injection ports 14c and 14d and the outer injection ports 15c and 15d is supplied to the second coil end 33 b.

The inner injection ports 14a and the inner injection ports 14c have the same configuration except for the axial position and the point at which the coil end 33 of the supply oil O is different. The inner injection ports 14b and the inner injection ports 14d have the same configuration except for the axial position and the point at which the coil ends 33 of the supply oil O are different. The outer injection ports 15a and 15c have the same configuration except for the axial position and the point at which the coil end 33 of the oil O is supplied. The outer injection ports 15b and 15d have the same configuration except for the axial position and the point at which the coil end 33 of the oil O is supplied. The relative positional relationship of the inner injection ports 14a, the inner injection ports 14b, the outer injection ports 15a, and the outer injection ports 15b is the same as the relative positional relationship of the inner injection ports 14c, the inner injection ports 14d, the outer injection ports 15c, and the outer injection ports 15 d. Therefore, in the following description, the plurality of inner injection ports 14 and the plurality of outer injection ports 15 are typically used, and only the inner injection ports 14a, the inner injection ports 14b, the outer injection ports 15a, and the outer injection ports 15b will be described.

As shown in fig. 5, the inner injection port 14a provided in the first refrigerant injection portion 11 opens obliquely to the side of the second refrigerant injection portion 12 in the circumferential direction with respect to the direction toward the motor shaft J1. The orientation toward the motor shaft J1 is a radially inward orientation. In the first refrigerant injection portion 11, the direction toward the motor shaft J1 includes, for example, a direction toward the radially inner side along the imaginary line IL 1. The imaginary line IL1 is an imaginary line that passes through the motor shaft J1 and the center point CP1 of the first refrigerant ejection portion 11 as viewed in the axial direction and extends in the radial direction. The center point CP1 is a point located at the center of the first refrigerant ejecting portion 11, which is a cylindrical tube, when viewed in the axial direction.

In the present embodiment, the phrase "the inner injection port 14a is opened to be inclined to the side where the second refrigerant ejection part 12 is located in the circumferential direction with respect to the direction toward the motor shaft J1" means that when a virtual line segment extending from the inner injection port 14a to the stator 30 along the direction ID1 in which the inner injection port 14a is opened is defined, the circumferential position of the line segment is closer to the circumferential position of the second refrigerant ejection part 12 as the circumferential position of the line segment is closer to the stator 30. In the present embodiment, the direction ID1 in which the inner injection port 14a opens is a direction in which the hole 16a having the inner injection port 14a as an opening portion penetrates the first refrigerant injecting portion 11 from the inner peripheral surface to the outer peripheral surface.

Further, in the present specification, the "orientation of the ejection port opening" includes an orientation passing through the center of the ejection port and along a normal line perpendicular to the center of the ejection port. For example, a two-dot chain line shown as toward ID1 in fig. 5 is a normal line passing through the center of the inner injection ports 14a and perpendicular with respect to the center of the inner injection ports 14 a.

The inner injection port 14b provided in the second refrigerant injection portion 12 is opened obliquely to the side where the first refrigerant injection portion 11 is located in the circumferential direction with respect to the direction toward the motor shaft J1. That is, the first refrigerant ejecting portion 11 and the second refrigerant ejecting portion 12 have the inner ejection port 14, and the inner ejection port 14 is opened obliquely to the side where the other refrigerant ejecting portion is located in the circumferential direction with respect to the direction toward the motor shaft J1. In the second refrigerant injection portion 12, the direction toward the motor shaft J1 includes, for example, a direction toward the radially inner side along the imaginary line IL 2. The imaginary line IL2 is an imaginary line that passes through the motor shaft J1 and the center point CP2 of the second refrigerant ejection portion 12 as viewed in the axial direction and extends in the radial direction. The center point CP2 is a point located at the center of the second refrigerant ejecting portion 12, which is a cylindrical tube, as viewed in the axial direction.

In the present embodiment, the phrase "the inner injection port 14b is opened obliquely in the circumferential direction to the side where the first refrigerant ejection part 11 is located with respect to the direction toward the motor shaft J1" means that when a virtual line segment extending from the inner injection port 14b to the stator 30 along the direction ID2 in which the inner injection port 14b is opened is defined, the circumferential position of the line segment is closer to the stator 30, and the circumferential position of the first refrigerant ejection part 11 is closer. In the present embodiment, the direction ID2 in which the inner injection port 14b opens is the direction in which the hole 16b having the inner injection port 14b as an opening portion penetrates the second refrigerant injection portion 12 from the inner peripheral surface to the outer peripheral surface.

The distance L1a between the center line CL3 and the inner side injection port 14a of the first refrigerant injection part 11, as viewed in the axial direction, is the same as the distance L2a between the center line CL3 and the inner side injection port 14b of the second refrigerant injection part 12, for example. In fig. 5, the distance L1a is the distance between the center of the circular inner jet port 14a and the center line CL3 in the front-rear direction. In fig. 5, the distance L2a is the distance between the center of the circular inner jet port 14b and the center line CL3 in the front-rear direction.

The absolute value of the inclination θ 1a with respect to the vertical direction of the direction ID1 at which the inner injection port 14a of the first refrigerant injection part 11 opens and the absolute value of the inclination θ 2a with respect to the vertical direction of the direction ID2 at which the inner injection port 14b of the second refrigerant injection part 12 opens are, for example, the same as each other as viewed in the axial direction.

In the present specification, "certain parameters are identical to each other" includes the case where certain parameters are substantially identical to each other, except that certain parameters are strictly identical to each other. That is, for example, the phrase "the distance L1a and the distance L2a are identical to each other" also includes the case where the distance L1a and the distance L2a are substantially identical to each other. For example, "the absolute value of the inclination θ 1a and the absolute value of the inclination θ 2a are the same as each other" also includes a case where the absolute value of the inclination θ 1a and the absolute value of the inclination θ 2a are substantially the same as each other. "certain parameters are substantially the same as each other" includes, for example, a case where certain parameters are slightly deviated from each other within a range of tolerance.

The direction ID1 in which the inner injection port 14a of the first refrigerant injection part 11 opens and the direction ID2 in which the inner injection port 14b of the second refrigerant injection part 12 opens are inclined to each other on opposite sides in the circumferential direction with respect to the vertical direction. The direction ID1 in which the inner injection port 14a of the first refrigerant ejection part 11 opens and the direction ID2 in which the inner injection port 14b of the second refrigerant ejection part 12 opens are directions in which, when an imaginary line segment extending from each inner injection port 14 to the first coil end 33a is defined, the line segments approach each other in the circumferential direction as they approach the first coil end 33 a. Therefore, the oil O injected from the inner injection ports 14a and the oil O injected from the inner injection ports 14b are circumferentially close to each other as they are close to the first coil end 33 a.

In the following description, a side in the circumferential direction closer to the center line CL3 with respect to the first refrigerant injection portion 11 and the second refrigerant injection portion 12 is referred to as "inner side in the circumferential direction", and a side in the circumferential direction farther from the center line CL3 with respect to the first refrigerant injection portion 11 and the second refrigerant injection portion 12 is referred to as "outer side in the circumferential direction".

The inner injection ports 14a and 14b are opened in a direction inclined inward in the circumferential direction. In the present embodiment, the inner injection ports 14a are opened in a direction inclined toward the rear side with respect to the vertical direction. In the present embodiment, the inner injection ports 14b are opened in a direction inclined toward the front side with respect to the vertical direction.

In the present embodiment, the opening area of the inner ejection openings 14a and the opening area of the inner ejection openings 14b are the same as each other. That is, the inner diameter of the inner injection ports 14a and the inner diameter of the inner injection ports 14b are the same as each other. The opening areas of the inner ports 14a and 14b are, for example, the same as the opening areas of the first ports 13a and the opening areas of the second ports 13 b.

The inner diameter of the hole 16a having the inner port 14a as an opening portion is the same throughout the entire first refrigerant injecting portion 11 from the inner peripheral surface to the outer peripheral surface, for example. The inner diameter of the hole 16b having the inner port 14b as an opening portion is the same throughout the entire second refrigerant injecting portion 12 from the inner peripheral surface to the outer peripheral surface, for example. The inner diameter of the hole 16a and the inner diameter of the hole 16b are the same as each other. The cross-sectional areas of the holes 16a and 16b are the same throughout the entire refrigerant ejecting portions from the inner circumferential surface to the outer circumferential surface.

The outer injection port 15a provided in the first refrigerant injection portion 11 is opened obliquely to the side opposite to the side where the second refrigerant injection portion 12 is located in the circumferential direction with respect to the direction toward the motor shaft J1. That is, the outer injection ports 15a are inclined to the side opposite to the side inclined to the inner injection ports 14a in the circumferential direction toward the motor shaft J1.

In the present embodiment, the phrase "the outer injection port 15a is opened obliquely to the side opposite to the side where the second refrigerant ejection part 12 is located in the circumferential direction with respect to the direction toward the motor shaft J1" means that when an imaginary line segment extending from the outer injection port 15a to the stator 30 along the direction OD1 in which the outer injection port 15a is opened is defined, the circumferential position of the line segment is farther from the circumferential position of the second refrigerant ejection part 12 as the circumferential position of the line segment is closer to the stator 30. In the present embodiment, the direction OD1 in which the outer injection port 15a opens is a direction in which the hole 17a having the outer injection port 15a as an opening portion penetrates the first refrigerant injection portion 11 from the inner peripheral surface to the outer peripheral surface.

In the present embodiment, the outer injection ports 15a are opened in a direction inclined with respect to the vertical direction. Note that, in the first refrigerant injection portion 11 of the present embodiment, the "direction inclined in the circumferential direction to the side opposite to the side where the second refrigerant injection portion 12 is located with respect to the direction toward the motor axis J1" includes a direction directed directly downward in the vertical direction. The orientation OD1 toward which the outer injection ports 15a open is smaller than the inclination of the tangent TL1 of the stator 30 passing through the outer injection ports 15a with respect to the orientation toward the motor shaft J1 as viewed in the axial direction. In other words, the angle formed by the tangent line TL1 and the imaginary line IL1 is larger than the angle formed by the orientation OD1 of the opening of the outer ejection port 15a and the imaginary line IL1 as viewed in the axial direction.

In the present embodiment, the tangent line TL1 is a tangent line passing through the center of the outer injection port 15a as viewed in the axial direction. The tangent line TL1 is in contact with the outer peripheral surface of the front side portion of the main body portion 33c in the first coil end 33a as viewed in the axial direction. In this way, in the present embodiment, the direction OD1 in which the outer injection port 15a opens is inclined outward in the circumferential direction with respect to the direction toward the motor shaft J1 and inward in the circumferential direction with respect to the tangent TL 1.

The outer injection port 15b provided in the second refrigerant injection portion 12 is opened obliquely to the side opposite to the side where the first refrigerant injection portion 11 is located in the circumferential direction with respect to the direction toward the motor shaft J1. That is, the first refrigerant injection part 11 and the second refrigerant injection part 12 have the outer injection port 15, and the outer injection port 15 is opened obliquely to the side opposite to the side where the other refrigerant injection part is located in the circumferential direction with respect to the direction toward the motor shaft J1.

In the present embodiment, the phrase "the outer injection port 15b is opened obliquely to the side opposite to the side where the first refrigerant injection part 11 is located in the circumferential direction with respect to the direction toward the motor shaft J1" means that when an imaginary line segment extending from the outer injection port 15b to the stator 30 along the direction OD2 in which the outer injection port 15b is opened is defined, the circumferential position of the line segment is farther from the circumferential position of the first refrigerant injection part 11 as the circumferential position of the line segment is closer to the stator 30. In the present embodiment, the direction OD2 in which the outer injection port 15b opens is a direction in which the hole 17b having the outer injection port 15b as an opening portion penetrates the second refrigerant injection portion 12 from the inner peripheral surface to the outer peripheral surface.

In the present embodiment, the outer injection ports 15b are opened in a direction inclined with respect to the vertical direction. Note that, in the second refrigerant injection portion 12 of the present embodiment, the "direction inclined in the circumferential direction to the side opposite to the side where the first refrigerant injection portion 11 is located with respect to the direction toward the motor axis J1" includes a direction directed directly downward in the vertical direction. The orientation OD2 toward which the outer injection ports 15b open is smaller than the inclination of the tangent TL2 of the stator 30 passing through the outer injection ports 15b with respect to the orientation toward the motor shaft J1 as viewed in the axial direction. In other words, the angle formed by the tangent line TL2 and the imaginary line IL2 is larger than the angle formed by the orientation OD2 of the opening of the outer ejection port 15b and the imaginary line IL2 as viewed in the axial direction.

In the present embodiment, the tangent line TL2 is a tangent line passing through the center of the outer injection port 15b as viewed in the axial direction. The tangent line TL2 is in contact with the outer peripheral surface of the rear side portion of the main body portion 33c in the first coil end 33a as viewed in the axial direction. In this way, in the present embodiment, the direction OD2 in which the outer injection port 15b opens is inclined outward in the circumferential direction with respect to the direction toward the motor shaft J1 and inward in the circumferential direction with respect to the tangent TL 2.

The distance L1b between the center line CL3 and the outer side injection ports 15a of the first refrigerant injection part 11, as viewed in the axial direction, is the same as the distance L2b between the center line CL3 and the outer side injection ports 15b of the second refrigerant injection part 12, for example. In fig. 5, a distance L1b is a distance between the center of the outer jet port 15a and the center line CL3 in the front-rear direction. In fig. 5, the distance L2b is the distance in the front-rear direction between the center of the outer jet port 15b and the center line CL 3.

The absolute value of the inclination θ 1b of the opening direction OD1 of the outer injection port 15a of the first refrigerant injection part 11 with respect to the vertical direction and the absolute value of the inclination θ 2b of the opening direction OD2 of the outer injection port 15b of the second refrigerant injection part 12 with respect to the vertical direction are, for example, the same as each other when viewed in the axial direction. The absolute values of the inclinations θ 1b, θ 2b are smaller than the absolute values of the inclinations θ 1a, θ 2 a. That is, the inner injection ports 14a and 14b are opened in a direction inclined with respect to the vertical direction with respect to the outer injection ports 15a and 15 b.

The outer injection ports 15a of the first refrigerant injection part 11 open toward OD1 and the outer injection ports 15b of the second refrigerant injection part 12 open toward OD2 in the circumferential direction away from each other as they go radially inward. Therefore, the oil O injected from the outer injection ports 15a and the oil O injected from the outer injection ports 15b are circumferentially distant from each other as approaching the first coil end 33 a.

The direction OD1 toward which the outer injection port 15a of the first refrigerant injection part 11 opens and the direction OD2 toward which the outer injection port 15b of the second refrigerant injection part 12 opens are inclined to opposite sides in the circumferential direction with respect to the vertical direction. The direction OD1 toward which the outer injection port 15a of the first refrigerant ejection part 11 opens and the direction OD2 toward which the outer injection port 15b of the second refrigerant ejection part 12 opens are directions away from each other in the circumferential direction as approaching the first coil end 33a when an imaginary line segment extending from each outer injection port 15 to the first coil end 33a is defined. Therefore, the oil O injected from the outer injection ports 15a and the oil O injected from the outer injection ports 15b are circumferentially distant from each other as approaching the first coil end 33 a.

The outer injection ports 15a and 15b are opened in a direction inclined outward in the circumferential direction. In the present embodiment, the outer injection ports 15a are opened in a direction inclined toward the front side with respect to the vertical direction. In the present embodiment, the outer injection ports 15b are opened in a direction inclined toward the rear side with respect to the direction directly below the vertical direction.

In the present embodiment, the opening areas of the outer ejection openings 15a and the opening areas of the outer ejection openings 15b are the same as each other. That is, the inner diameter of the outer ejection openings 15a and the inner diameter of the outer ejection openings 15b are the same as each other. The inner diameter of the hole 17a having the outer injection port 15a as an opening portion is the same throughout the entire first refrigerant injection portion 11 from the inner peripheral surface to the outer peripheral surface, for example. The inner diameter of the hole 17b having the outer injection port 15b as an opening portion is the same throughout the entire second refrigerant injection portion 12 from the inner peripheral surface to the outer peripheral surface, for example. The inner diameter of the hole 17a and the inner diameter of the hole 17b are the same as each other. The cross-sectional areas of the holes 17a and 17b are the same throughout the entire refrigerant ejecting portions from the inner circumferential surface to the outer circumferential surface.

The opening areas of the outer ports 15a, 15b are larger than the opening areas of the inner ports 14a, 14 b. That is, the inner diameters of the outer injection ports 15a and 15b are larger than the inner diameters of the inner injection ports 14a and 14 b. In other words, the size of each outer injection port 15 is larger than the size of each inner injection port 14. The inner diameter of the holes 17a, 17b is larger than the inner diameter of the holes 16a, 16 b.

In the present embodiment, four inner injection ports 14 and four outer injection ports 15 are provided. That is, the number of the inner injection ports 14 and the number of the outer injection ports 15 are equal to each other. Therefore, the total opening area of the outer injection ports 15 is larger than the total opening area of the inner injection ports 14.

In the present specification, the "total opening area of certain ejection openings" refers to the opening area of one ejection opening when only one ejection opening is provided, and refers to the area obtained by adding the opening areas of a plurality of ejection openings when a plurality of ejection openings are provided. That is, in the present embodiment, the total opening area of the inner ejection ports 14 is an area obtained by adding the opening area of the inner ejection ports 14a, the opening area of the inner ejection ports 14b, the opening area of the inner ejection ports 14c, and the opening area of the inner ejection ports 14 d. In the present embodiment, the total opening area of the outer ejection ports 15 is an area obtained by adding the opening area of the outer ejection ports 15a, the opening area of the outer ejection ports 15b, the opening area of the outer ejection ports 15c, and the opening area of the outer ejection ports 15 d.

The first refrigerant injection part 11 and the second refrigerant injection part 12 inject the oil O as the refrigerant to the stator 30 through the injection ports. This allows the oil O to be supplied from the first refrigerant injection part 11 and the second refrigerant injection part 12 to the stator 30, and the stator 30 can be cooled. More specifically, the oil O can be supplied from the first refrigerant injection part 11 and the second refrigerant injection part 12 to the stator core 32, the first coil end 33a, and the second coil end 33b, and the stator core 32, the first coil end 33a, and the second coil end 33b can be cooled.

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

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

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

According to the present embodiment, at least one of the first refrigerant ejection part 11 and the second refrigerant ejection part 12 has the inner ejection port 14, and each of the first refrigerant ejection part 11 and the second refrigerant ejection part 12 has the outer ejection port 15. Therefore, the oil O as the refrigerant can be supplied to the portion of the stator 30 located on the inner side in the circumferential direction than the first refrigerant injection portion 11 and the second refrigerant injection portion 12 by the inner injection port 14. Further, the oil O as the refrigerant can be supplied to the portion of the stator 30 located on the outer side in the circumferential direction than the first refrigerant injection portion 11 and the second refrigerant injection portion 12 by the outer injection port 15. This facilitates the supply of the oil O to the entire circumference of the stator 30. Therefore, the cooling efficiency of the stator 30 can be improved.

For example, the circumferential range of the portion of the stator 30 located on the outer side in the circumferential direction than the first refrigerant injection portion 11 and the second refrigerant injection portion 12 is wider than the portion of the stator 30 located on the inner side in the circumferential direction than the first refrigerant injection portion 11 and the second refrigerant injection portion 12. In contrast, according to the present embodiment, the total opening area of the outer injection ports 15 is larger than the total opening area of the inner injection ports 14. Therefore, the amount per unit time of the oil O injected from the outer injection ports 15 can be made larger than the amount per unit time of the oil O injected from the inner injection ports 14. This makes it easy to supply a sufficient amount of oil O to the outer portion of the stator 30 in the circumferential direction, which has a large circumferential range. Therefore, the oil O is easily and more appropriately supplied to the entire circumference of the stator 30. Therefore, the cooling efficiency of the stator 30 can be further improved.

In addition, according to the present embodiment, the first refrigerant injection portion 11 and the second refrigerant injection portion 12 are positioned on the upper side of the stator 30 in the vertical direction. Therefore, the oil O supplied from the first refrigerant injection part 11 and the second refrigerant injection part 12 to the stator 30 is easily made to flow from the upper side to the lower side along the outer circumferential surface of the stator 30 by gravity. This makes it easier to supply the oil O to the entire circumference of the stator 30. Therefore, the cooling efficiency of the stator 30 can be further improved. In the present embodiment, the outer peripheral surface of the stator 30 includes the outer peripheral surface of the coil end 33.

In addition, according to the present embodiment, the outer injection ports 15 are opened in a direction inclined with respect to the vertical direction. Therefore, the direction in which the outer injection ports 15 open is easily made closer to the direction of the tangent of the stator 30 passing through the outer injection ports 15. Therefore, when the oil O injected from the outer injection port 15 is supplied to the stator 30, the blow angle of the oil O with respect to the outer peripheral surface of the stator 30 is easily reduced. Therefore, the oil O blown to the outer circumferential surface of the stator 30 can be made to easily flow along the outer circumferential surface of the stator 30. Therefore, the oil O can be supplied more easily to the entire circumference of the stator 30. This can further improve the cooling efficiency of the stator 30.

Further, according to the present embodiment, the first refrigerant injection part 11 and the second refrigerant injection part 12 are disposed so as to sandwich the center line CL3 that passes through the motor shaft J1 and extends in the vertical direction, as viewed in the axial direction. Therefore, the oil O is easily uniformly supplied from each injection port of each refrigerant injection portion to each of the portions of the stator 30 disposed on both sides with respect to the center line CL 3.

In addition, according to the present embodiment, the distance L1b between the center line CL3 and the outer injection ports 15a of the first refrigerant injection part 11 and the distance L2b between the center line CL3 and the outer injection ports 15b of the second refrigerant injection part 12 are the same as viewed in the axial direction. Therefore, the oil O is easily equally supplied to each of the circumferential outer portions of the stator 30 located on both sides across the center line CL3 via each of the outer injection ports 15a and 15 b.

In addition, according to the present embodiment, the absolute value of the inclination θ 1b with respect to the vertical direction of the opening direction OD1 of the outer injection port 15a of the first refrigerant injection part 11 and the absolute value of the inclination θ 2b with respect to the vertical direction of the opening direction OD2 of the outer injection port 15b of the second refrigerant injection part 12 are the same as each other as viewed in the axial direction. Therefore, the oil O is easily supplied more equally to each of the circumferential outer portions of the stator 30 located on both sides across the center line CL3 via each of the outer injection ports 15a, 15 b.

In addition, according to the present embodiment, the distance L1a between the center line CL3 and the inner side injection ports 14a of the first refrigerant injection part 11 and the distance L2a between the center line CL3 and the inner side injection ports 14b of the second refrigerant injection part 12 are the same as viewed in the axial direction. Therefore, it is easy to equally supply the oil O to each of the circumferentially inner portions of the stator 30 located on both sides across the center line CL3 via each of the inner injection ports 14a, 14 b.

Further, according to the present embodiment, the absolute value of the inclination θ 1a with respect to the vertical direction of the direction ID1 at which the inner injection port 14a of the first refrigerant injection part 11 opens and the absolute value of the inclination θ 2a with respect to the vertical direction of the direction ID2 at which the inner injection port 14b of the second refrigerant injection part 12 opens are the same as each other as viewed in the axial direction. Therefore, it is easy to supply the oil O more equally to each of the circumferentially inner portions of the stator 30 located on both sides across the center line CL3 via each of the inner injection ports 14a, 14 b.

Further, according to the present embodiment, the inclination of the orientation of the opening of the outer injection port 15 with respect to the orientation toward the motor shaft J1 is smaller than the tangential line of the stator 30 passing through the outer injection port 15 as viewed in the axial direction. Therefore, the oil O injected from the outer injection ports 15 can be suppressed from missing the outer peripheral surface of the stator 30. This enables the oil O injected from the outer injection port 15 to be appropriately supplied to the stator 30.

In addition, according to the present embodiment, the size of each outer ejection port 15 is larger than the size of each inner ejection port 14. Therefore, even in the case where the number of the outer injection ports 15 and the number of the inner injection ports 14 are made the same, the total opening area of the outer injection ports 15 can be made larger than the total opening area of the inner injection ports 14. This makes it possible to increase the amount of oil O per unit time injected from the outer injection ports 15 more than the amount of oil O per unit time injected from the inner injection ports 14 without increasing the number of the outer injection ports 15.

In addition, according to the present embodiment, in at least one of the first refrigerant injecting portion 11 and the second refrigerant injecting portion 12, the inner injection ports 14 and the outer injection ports 15 are opened toward the coil ends 33. Therefore, the oil O can be supplied to the coil end 33, and the coil end 33 can be cooled appropriately. In particular, in the present embodiment, the inner injection ports 14 and the outer injection ports 15 open to the coil ends 33 in both the first refrigerant injection part 11 and the second refrigerant injection part 12. Therefore, the coil end 33 can be further appropriately cooled.

Further, when the first refrigerant ejection part 11 and the second refrigerant ejection part 12 are positioned on the upper side in the vertical direction of the stator 30, and the first refrigerant ejection part 11 and the second refrigerant ejection part 12 each have the inner side ejection port 14, the oils O ejected from the inner side ejection ports 14 of the respective refrigerant ejection parts may collide with each other in the circumferential direction on the outer peripheral surface of the upper side portion of the coil end 33. In this case, if it is assumed that the collided oil O flows outward in the circumferential direction, the amount of the oil O injected from the inner injection ports 14 is increased, and the oil O can easily flow over the entire circumference of the coil end 33. However, the oil O having collided with the coil end 33 easily flows in the axial direction and is separated from the coil end 33. Therefore, the oil O supplied to the coil end 33 is likely to be insufficient only by providing the inner injection ports 14. Therefore, by providing the outer injection ports 15 inclined outward in the circumferential direction and having a larger total opening area than the inner injection ports 14 as in the present embodiment, the oil O can be easily supplied to the coil ends 33 sufficiently.

Further, according to the present embodiment, the inner injection ports 14 and the outer injection ports 15 are disposed at the same positions as the center of the coil end 33 or positions closer to the stator core 32 than the center of the coil end 33 in the axial direction of the motor shaft J1, overlapping the coil end 33 as viewed in the vertical direction. Specifically, in the present embodiment, the inner injection ports 14a and 14b and the outer injection ports 15a and 15b are arranged at the same positions as the center of the first coil end 33a in the axial direction of the motor shaft J1 as viewed in the vertical direction. Therefore, the oil O can be easily supplied appropriately to both side portions of the first coil end 33a that sandwich the axial center line CL 1. This facilitates the supply of the oil O to the entire first coil end 33a in the axial direction. Therefore, the cooling efficiency of the stator 30 can be further improved.

Further, the inner injection ports 14c and 14d and the outer injection ports 15c and 15d are disposed closer to the stator core 32 than the center of the second coil end 33b in the axial direction of the motor shaft J1 as viewed in the vertical direction. Therefore, even when the oil O supplied from the inner injection ports 14c and 14d and the outer injection ports 15c and 15d to the second coil end 33b flows in the axial direction on the second coil end 33b, the oil O hardly overflows to the side opposite to the side where the stator core 32 is located. Further, the oil O flowing in the axial direction toward the stator core 32 on the second coil ends 33b is supplied to the stator core 32, or is blocked by the stator core 32 to suppress the oil O from overflowing from the second coil ends 33 b. Therefore, the oil O supplied to the second coil ends 33b is easily used for cooling the stator 30 without waste. Therefore, the cooling efficiency of the stator 30 can be further improved.

In addition, according to the present embodiment, the coil end 33 has the binding member 33e binding the coil 31 a. In this case, the bundling member 33e easily causes unevenness on the outer peripheral surface of the coil end 33. Therefore, a part of the oil O supplied to the coil end 33 from the outer injection port 15 opening obliquely outward in the circumferential direction may collide with the bundling member 33e and be splashed, and may not flow along the outer peripheral surface of the coil end 33. In contrast, according to the present embodiment, the total opening area of the outer injection ports 15 is larger than the total opening area of the inner injection ports 14, so the amount of oil O injected from the outer injection ports 15 can be made large. Thus, even when a part of the oil O is splashed by the bundling member 33e, the amount of the oil O flowing along the outer peripheral surface of the coil end 33 is easily secured. Therefore, a decrease in cooling efficiency of the stator 30 can be suppressed. As described above, in the present embodiment, the effect obtained by the total opening area of the outer ejection openings 15 being larger than the total opening area of the inner ejection openings 14 is more useful in the case where the coil ends 33 have the tying members 33 e.

In addition, according to the present embodiment, the first refrigerant injection part 11 and the second refrigerant injection part 12 are tubes. Therefore, the first refrigerant injection part 11 and the second refrigerant injection part 12 can be easily manufactured, compared to a case where, for example, holes are provided in the wall portion of the housing 6 to manufacture the first refrigerant injection part 11 and the second refrigerant injection part 12. In addition, the first refrigerant injection part 11 and the second refrigerant injection part 12 are also easily detached from the housing 6 and replaced.

Further, according to the present embodiment, the driving device 1 includes the refrigerant supply passage 94 connected to both the first refrigerant injection part 11 and the second refrigerant injection part 12. Therefore, the oil O is easily supplied equally to the first refrigerant injection portion 11 and the second refrigerant injection portion 12 via the refrigerant supply passage 94. This makes it easy to make the amount of oil O injected from the first refrigerant injection portion 11 to the stator 30 the same as the amount of oil O injected from the second refrigerant injection portion 12 to the stator 30. Therefore, when the first refrigerant injection part 11 and the second refrigerant injection part 12 are arranged line-symmetrically with respect to the center line CL3 as in the present embodiment, the oil O is easily supplied uniformly to the entire stator 30, and the entire stator 30 is easily cooled.

(modification of the first embodiment)

As shown in fig. 6, the first refrigerant injection portion 111 and the second refrigerant injection portion 112 of the present modification are shifted in circumferential direction to the front side with respect to the first refrigerant injection portion 11 and the second refrigerant injection portion 12 of the above-described embodiment. In the present modification, the distance L1c between the center line CL3 and the inner injection port 114a of the first refrigerant injection part 111 is greater than the distance L2c between the center line CL3 and the inner injection port 114b of the second refrigerant injection part 112 as viewed in the axial direction. The distance L1d between the center line CL3 and the outer side injection port 115a of the first refrigerant injection part 111 is greater than the distance L2d between the center line CL3 and the outer side injection port 115b of the second refrigerant injection part 112 as viewed in the axial direction.

The absolute value of the inclination θ 1c with respect to the vertical direction of the direction in which the inner injection port 114a of the first refrigerant injection part 111 opens is larger than the absolute value of the inclination θ 2c with respect to the vertical direction of the direction in which the inner injection port 114b of the second refrigerant injection part 112 opens, as viewed in the axial direction. The absolute value of the inclination θ 1d with respect to the vertical direction of the direction in which the outer injection port 115a of the first refrigerant injection part 111 opens is smaller than the absolute value of the inclination θ 2d with respect to the vertical direction of the direction in which the outer injection port 115b of the second refrigerant injection part 112 opens, as viewed in the axial direction. The other configurations of the first refrigerant injection portion 111 and the second refrigerant injection portion 112 of the present modification are the same as those of the first refrigerant injection portion 11 and the second refrigerant injection portion 12 of the above-described embodiment.

< second embodiment >

As shown in fig. 7, the first refrigerant injection part 211 of the present embodiment has two outer injection ports 215a and 215e for the outer injection port 15 opened toward the first coil end 33 a. The axial position of the outer injection ports 215a and the axial position of the outer injection ports 215e are the same as each other. The opening direction OD1a of the outer injection ports 215a is inclined outward in the circumferential direction than the opening direction OD1 of the outer injection ports 15a of the first embodiment. The opening direction OD1e of the outer injection ports 215e is inclined inward in the circumferential direction than the opening direction OD1 of the outer injection ports 15a of the first embodiment. The opening direction OD1e of the outer injection port 215e is, for example, a direction directly downward in the vertical direction. Although not shown, the first refrigerant injection part 211 also has, for example, two outer injection ports 15 that open toward the second coil end 33 b. That is, the first refrigerant injection portion 211 has four outer injection ports 15 in total.

The second refrigerant injection part 212 of the present embodiment has two outer injection ports 215b and 215f for the outer injection port 15 opened toward the first coil end 33 a. The axial position of the outer injection ports 215b and the axial position of the outer injection ports 215f are the same as each other. The opening direction OD2b of the outer injection ports 215b is inclined outward in the circumferential direction than the opening direction OD2 of the outer injection ports 15b of the first embodiment. The opening direction OD2f of the outer injection ports 215f is inclined inward in the circumferential direction than the opening direction OD2 of the outer injection ports 15b of the first embodiment. The opening direction OD2f of the outer injection port 215f is, for example, a direction directly downward in the vertical direction. Although not shown, the second refrigerant injection part 212 also has, for example, two outer injection ports 15 that open toward the second coil ends 33 b. That is, the second refrigerant injecting portion 212 has four outer injection ports 15 in total.

The opening areas of the outer ports 215a, 215b, 215e, 215f are the same as the opening areas of the inner ports 14a, 14 b. That is, the inner diameters of the outer ports 215a, 215b, 215e, and 215f are the same as the inner diameters of the inner ports 14a and 14 b. In other words, in the present embodiment, the size of each outer ejection port 15 is the same as the size of each inner ejection port 14.

In the present embodiment, the outer injection ports 15 are provided with four outer injection ports 15 provided in the first refrigerant injection portion 211 and four outer injection ports 15 provided in the second refrigerant injection portion 212, and eight outer injection ports in total are provided. On the other hand, as in the first embodiment, four inner injection ports 14 are provided in total. That is, in the present embodiment, the number of the outer injection ports 15 is larger than the number of the inner injection ports 14. Therefore, even if the opening area of each of the outer injection ports 15 is the same as the opening area of each of the inner injection ports 14, the total opening area of the outer injection ports 15 is larger than the total opening area of the inner injection ports 14. Thus, as in the first embodiment described above, the amount per unit time of the oil O injected from the outer injection ports 15 can be made larger than the amount per unit time of the oil O injected from the inner injection ports 14.

The other configurations of the first refrigerant injection part 211 and the second refrigerant injection part 212 of the present embodiment are the same as those of the first refrigerant injection part 11 and the second refrigerant injection part 12 of the first embodiment described above.

According to the present embodiment, the size of each outer ejection port 15 and the size of each inner ejection port 14 are the same as each other. Therefore, for example, when the respective ejection ports are manufactured by hole machining, holes having the same inner diameter may be manufactured. Therefore, the production of each ejection opening can be facilitated.

< third embodiment >

As shown in fig. 8, the inner injection ports 14 of the first refrigerant injection part 311 of the present embodiment have only the inner injection ports 14c opening toward the second coil end 33 b. That is, in the present embodiment, the inner injection ports 14 of the first refrigerant injection part 311 are opened only toward the second coil ends 33 b. The inner injection port 14 of the second refrigerant injection part 312 of the present embodiment has only the inner injection port 14b opening toward the first coil end 33 a. That is, in the present embodiment, the inner injection ports 14 of the second refrigerant injection portion 312 are opened only toward the first coil end 33 a. The other configurations of the first refrigerant injection part 311 and the second refrigerant injection part 312 of the present embodiment are the same as those of the first refrigerant injection part 11 and the second refrigerant injection part 12 of the first embodiment described above.

According to the present embodiment, only one inner injection port 14 that opens toward the coil end 33 is provided in the first refrigerant injection portion 311 and the second refrigerant injection portion 312. Therefore, the number of inner injection ports 14 can be reduced in each refrigerant injection portion. This makes it possible to reduce the total opening area of the injection ports provided in the refrigerant injection portions. Therefore, the drop in the momentum of the oil O injected from each injection port of each refrigerant injection portion can be suppressed. Further, the first refrigerant injection portion 311 and the second refrigerant injection portion 312 are provided with inner injection ports 14 that open to different coil ends 33, respectively. Therefore, the oil O can be appropriately supplied to the circumferentially inner portion in both the first coil end 33a and the second coil end 33 b.

Further, for example, as compared with the case where one of the refrigerant injecting portions is provided with the inner injection ports 14 opening toward the first coil end 33a and the inner injection ports 14 opening toward the second coil end 33b, and the other refrigerant injecting portion is not provided with the inner injection ports 14, it is easy to make the total opening area of the injection ports of the first refrigerant injecting portion 311 and the total opening area of the injection ports of the second refrigerant injecting portion 312 the same. This makes it easy to equalize the momentum of the oil O injected from the injection ports of the refrigerant injection portions.

Further, according to the present embodiment, the second refrigerant injection portion 312 located on the downstream side of the first refrigerant injection portion 311 in the flow direction of the oil O in the refrigerant supply passage 94 is provided with the inner injection port 14b opening toward the first coil end 33 a. The first coil end 33a is closer to the refrigerant supply path 94 than the second coil end 33 b. Therefore, the oil O flowing into the second refrigerant ejection part 312 after delaying from the oil O flowing from the refrigerant supply path 94 into the first refrigerant ejection part 311 can be supplied to the first coil end 33a located closer to the refrigerant supply path 94. Further, the oil O flowing into the first refrigerant ejection portion 311 earlier than the oil O flowing from the refrigerant supply path 94 into the second refrigerant ejection portion 312 can be supplied to the second coil end 33b located farther from the refrigerant supply path 94. This makes it easy to make the path length of the oil O from the inside of the refrigerant supply passage 94 to the inner injection port 14b opened toward the first coil end 33a approximately equal to the path length of the oil O from the inside of the refrigerant supply passage 94 to the inner injection port 14c opened toward the second coil end 33 b. Therefore, the oil O injected from the inner injection ports 14 to the coil ends 33 can be easily made to have the same potential.

Further, the inner injection port 14 of the first refrigerant injection part 311 may be opened only toward the first coil end 33a, and the inner injection port 14 of the second refrigerant injection part 312 may be opened only toward the second coil end 33 b. That is, the first refrigerant ejection portion 311 may be different from the first refrigerant ejection portion 11 of the first embodiment only in that the inner injection port 14c is not provided, and the second refrigerant ejection portion 312 may be different from the second refrigerant ejection portion 12 of the first embodiment only in that the inner injection port 14b is not provided.

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-described embodiment, the case where the refrigerant is oil O has been described, but the present invention is not limited thereto. The coolant is not particularly limited as long as it can supply the coolant to the stator and cool the stator. The refrigerant may be, for example, an insulating liquid or water. When the refrigerant is water, the surface of the stator may be subjected to an insulating treatment.

When the first refrigerant injection part and the second refrigerant injection part are tubes, each tube may be a polygonal tubular tube. The first refrigerant injection portion and the second refrigerant injection portion may not be pipes. The first refrigerant injection portion and the second refrigerant injection portion may be oil passages provided in the casing. The first refrigerant injection portion and the second refrigerant injection portion may not be positioned above the stator in the vertical direction. At least one of the first refrigerant injection portion and the second refrigerant injection portion may be positioned on one side of the stator in a direction orthogonal to both the vertical direction and the axial direction. The first refrigerant injection portion and the second refrigerant injection portion may be provided on the same side with respect to a center line that passes through the motor shaft and extends in the vertical direction, as viewed in the axial direction.

One of the first refrigerant injection portion and the second refrigerant injection portion may not have the inner injection port. For example, one of the first refrigerant injection part and the second refrigerant injection part may have an inner injection port opening toward the first coil end and an inner injection port opening toward the second coil end, and the other of the first refrigerant injection part and the second refrigerant injection part may not have the inner injection port. The inner injection ports may be provided only with the inner injection ports that are open toward one of the first coil end and the second coil end.

If the total opening area of the outer injection ports is larger than that of the inner injection ports, the total opening area of the outer injection ports and the total opening area of the inner injection ports of each refrigerant injection portion are not particularly limited. For example, even if the total opening area of the outer injection ports is equal to or smaller than the total opening area of the inner injection ports in one of the first refrigerant injection portion and the second refrigerant injection portion, the area obtained by adding the total opening area of the outer injection ports of the first refrigerant injection portion and the total opening area of the outer injection ports of the second refrigerant injection portion may be larger than the area obtained by adding the total opening area of the inner injection ports at the first refrigerant injection portion and the total opening area of the inner injection ports at the second refrigerant injection portion.

The direction of the outer injection port opening may be the same as the tangential line of the stator passing through the outer injection port, or may be inclined more toward the motor shaft than the tangential line of the stator passing through the outer injection port. For example, in the first embodiment described above, the outer injection ports 15a may be inclined outward in the circumferential direction with respect to the tangent line TL 1.

The inner injection port and the outer injection port are not particularly limited in position in the axial direction as long as they are injection ports for injecting the refrigerant to the stator. For example, in the first embodiment described above, the inner injection ports 14 and the outer injection ports 15 may be arranged at positions that overlap the coil ends 33 and are farther from the stator core than the center of the coil ends 33 in the axial direction of the motor shaft J1, as viewed in the vertical direction. The outer injection ports and the inner injection ports may be opened toward portions other than the coil ends of the stator. The outer injection ports and the inner injection ports may be opened toward the stator core, for example. In this case, the outer injection ports and the inner injection ports supply the oil O to the stator core. In addition, the inner injection port and the outer injection port may be opened toward the coil end in one of the first refrigerant injection portion and the second refrigerant injection portion, and the inner injection port and the outer injection port may be opened toward a portion of the stator other than the coil end, such as the stator core, in the other of the first refrigerant injection portion and the second refrigerant injection portion.

The total number of the inner jet ports is not particularly limited as long as it is one or more. The total number of the outer injection ports is not particularly limited as long as it is two or more. The number of inner injection ports provided in the first refrigerant injection portion and the number of inner injection ports provided in the second refrigerant injection portion may be different from each other. The number of outer injection ports provided in the first refrigerant injection portion and the number of outer injection ports provided in the second refrigerant injection portion may be different from each other. The shape of the inner ejection port is not particularly limited. The shape of the outer ejection port is not particularly limited.

For example, in the first embodiment described above, the inner injection port 14a of the first refrigerant injecting portion 11 may have a larger size. In this case, a part of the inner injection port 14a may be provided in a portion of the first refrigerant injection part 11 located radially inward of the center point CP1 and overlapping the imaginary line IL1 as viewed in the axial direction. The size of the outer injection port 15a of the first refrigerant injecting portion 11 may be larger. In this case, a part of the outer injection port 15a may be provided in a portion of the first refrigerant injection part 11 located radially inward of the center point CP1 and overlapping the imaginary line IL1 as viewed in the axial direction. These cases are also the same for the inner injection port 14b and the outer injection port 15b of the second refrigerant injection part 12 of the first embodiment described above.

The refrigerant supply path connecting the first refrigerant injection portion and the second refrigerant injection portion may have any shape or may be provided at any position. The oil O may be supplied to the first refrigerant ejection portion and the second refrigerant ejection portion from different oil passages. The coil ends may also be provided without a bundling means for bundling the coils.

The driving device is not particularly limited as long as it can move the object to be driven using a motor as a power source. The drive device may not include a transmission mechanism. The torque of the motor may be directly output from the shaft of the motor to the target. In this case, the driving device corresponds to the motor itself. The direction in which the motor shaft extends is not particularly limited as long as it intersects the vertical direction. The motor shaft may also extend in a direction inclined with respect to the horizontal direction. In the present specification, the phrase "the motor shaft extends in the horizontal direction orthogonal to the vertical direction" includes a case where the motor shaft extends in the substantially horizontal direction, in addition to a case where the motor shaft extends strictly in the horizontal direction. That is, in the present specification, the "motor shaft extends in the horizontal direction orthogonal to the vertical direction", and the motor shaft may be 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 include an inverter unit. In other words, the drive device may be configured integrally with the inverter unit.

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

Claims (16)

1. A drive device is characterized by comprising:

a motor having a rotor rotatable about a motor shaft extending in a direction intersecting a vertical direction, and a stator positioned radially outward of the rotor; and

a first refrigerant injection portion and a second refrigerant injection portion which are arranged at intervals in a circumferential direction on a radial outer side of the stator and inject a refrigerant toward the stator,

at least one of the first refrigerant injection part and the second refrigerant injection part has an inner injection port that opens obliquely with respect to a side facing the motor shaft and facing the other refrigerant injection part in the circumferential direction,

the first refrigerant injection part and the second refrigerant injection part each have an outer injection port that opens obliquely to a side opposite to the side where the other refrigerant injection part is located in a circumferential direction with respect to an orientation toward the motor shaft,

the total opening area of the outer ejection openings is larger than the total opening area of the inner ejection openings.

2. The drive device according to claim 1,

the first refrigerant injection portion and the second refrigerant injection portion are positioned above the stator in the vertical direction.

3. The drive device according to claim 2,

the outer injection port is opened in a direction inclined with respect to the vertical direction.

4. The drive device according to claim 2 or 3,

the first refrigerant injection portion and the second refrigerant injection portion are disposed so as to sandwich a center line that passes through the motor shaft and extends in the vertical direction, as viewed in the axial direction.

5. The drive device according to claim 4,

a distance between the center line and the outer injection port of the first refrigerant injection part and a distance between the center line and the outer injection port of the second refrigerant injection part are the same as each other as viewed in the axial direction.

6. A drive arrangement according to claim 4 or 5. It is characterized in that the preparation method is characterized in that,

the absolute value of the inclination with respect to the vertical direction of the orientation of the outer injection port opening of the first refrigerant injection part and the absolute value of the inclination with respect to the vertical direction of the orientation of the outer injection port opening of the second refrigerant injection part are the same as each other when viewed in the axial direction.

7. The drive device according to any one of claims 4 to 6,

the first refrigerant injection part and the second refrigerant injection part each have the inner injection port,

a distance between the center line and the inner injection port of the first refrigerant injection part and a distance between the center line and the inner injection port of the second refrigerant injection part are the same as each other as viewed in the axial direction.

8. The drive device according to any one of claims 4 to 7,

the first refrigerant injection part and the second refrigerant injection part each have the inner injection port,

the absolute value of the inclination with respect to the vertical direction of the orientation of the inner injection port opening of the first refrigerant injection part and the absolute value of the inclination with respect to the vertical direction of the orientation of the inner injection port opening of the second refrigerant injection part are the same as each other when viewed in the axial direction.

9. The drive device according to any one of claims 1 to 8,

the inclination of the direction of the outer injection port opening with respect to the direction toward the motor shaft is smaller than the inclination of the tangent of the stator passing through the outer injection port as viewed in the axial direction.

10. The drive device according to any one of claims 1 to 9,

the outer injection ports are larger than the inner injection ports.

11. The drive device according to any one of claims 1 to 10,

the stator includes:

a stator core; and

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

the coil block has coil ends axially protruding from the stator core,

in at least one of the first refrigerant injection part and the second refrigerant injection part, the inner injection port and the outer injection port are open to the coil end.

12. The drive device according to claim 11,

the coil end includes:

a first coil end protruding from the stator core to one axial side; and

a second coil end protruding from the stator core toward the other axial side,

the outer injection port of the first refrigerant injection part includes an outer injection port opened toward the first coil end and an outer injection port opened toward the second coil end,

the outer injection port of the second refrigerant injection part includes an outer injection port opened toward the first coil end and an outer injection port opened toward the second coil end,

the first refrigerant injection part and the second refrigerant injection part each have the inner injection port,

the inner injection port of the first refrigerant injection part is opened only toward one of the first coil end and the second coil end,

the inner injection port of the second refrigerant injection part is open only to the other of the first coil end and the second coil end.

13. The drive device according to claim 11 or 12,

the inner injection port and the outer injection port overlap the coil end as viewed in a direction orthogonal to the axial direction of the motor shaft, and are disposed at the same position as the center of the coil end or at a position closer to the stator core than the center of the coil end in the axial direction of the motor shaft.

14. The drive device according to any one of claims 11 to 13,

the coil end has a binding member for binding the coil.

15. The drive device according to any one of claims 1 to 14,

the first refrigerant injection part and the second refrigerant injection part are tubes.

16. The drive device according to any one of claims 1 to 15,

the refrigerant supply path is connected to both the first refrigerant injection unit and the second refrigerant injection unit.

Images