CN112152342A

CN112152342A - Drive device

Info

Publication number: CN112152342A
Application number: CN202010594471.5A
Authority: CN
Inventors: 中村圭吾; 高田响
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2019-06-28
Filing date: 2020-06-28
Publication date: 2020-12-29
Anticipated expiration: 2040-06-28
Also published as: JP7331501B2; CN112152342B; JP2021010217A

Abstract

The present invention provides a driving device, which comprises: a motor having a rotor rotatable about a motor axis and a stator located radially outside the rotor; a 1 st pipe and a 2 nd pipe which are positioned radially outside the stator and are arranged at intervals in a circumferential direction around a motor axis; a housing which houses the motor, the 1 st tube and the 2 nd tube therein; and a refrigerant flow path which connects the 1 st tube and the 2 nd tube and through which a refrigerant flows. The 1 st tube and the 2 nd tube have refrigerant supply ports for supplying refrigerant to the stator, respectively. The housing has an axial wall portion located on one axial side of the stator. The refrigerant flow path is provided in the axial wall portion.

Description

Drive device

Technical Field

The present invention relates to a drive device.

Background

A rotating electrical machine having a structure for cooling a stator is known. For example, patent document 1 describes a rotating electrical machine in which cooling oil is supplied from a plurality of pipes to a stator core main body to cool a stator.

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

In the rotating electric machine as described above, a path through which cooling oil is supplied is provided in the plurality of pipes. Such a path needs to be arranged so as to avoid interference with a fixed portion of the stator or the like. Therefore, for example, it is conceivable to provide such a path by laying piping or the like outside the casing of the rotating electric machine. However, in this case, there is a problem that the entire rotating electric machine is likely to be large.

Disclosure of Invention

In view of the above circumstances, an object of the present invention is to provide a drive device having a motor and a structure capable of suppressing an increase in size.

One embodiment of the present invention is a driving device including: a motor having a rotor rotatable about a motor axis and a stator positioned radially outward of the rotor, and a 1 st pipe and a 2 nd pipe positioned radially outward of the stator and spaced apart from each other in a circumferential direction about the motor axis; a housing that houses the motor, the 1 st tube, and the 2 nd tube therein; and a refrigerant flow path connecting the 1 st tube and the 2 nd tube and allowing a refrigerant to flow therein. The 1 st tube and the 2 nd tube each have a refrigerant supply port for supplying the refrigerant to the stator. The housing has an axial wall portion located on one axial side of the stator. The refrigerant flow path is provided in the axial wall portion.

According to one embodiment of the present invention, an increase in size of a drive device having a motor can be suppressed.

Drawings

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

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

Fig. 3 is a sectional view showing a part of the driving device of the present embodiment, and is a sectional view taken along line III-III of fig. 1.

Fig. 4 is a sectional view showing a part of the driving device of the present embodiment, and is a sectional view taken along line IV-IV of fig. 1.

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

Description of the reference symbols

1: a drive device; 2: a motor; 3: a transfer device; 6: a housing; 11: a 1 st tube; 12: a 2 nd pipe; 13: 1 st oil supply port (refrigerant supply port); 14: a 2 nd oil supply port (refrigerant supply port); 15: a 3 rd oil supply port (refrigerant supply port); 20: a rotor; 30: a stator; 31: a coil; 32: a stator core; 32 a: a stator core body; 32 b: a fixed part; 33: a coil assembly; 33a, 33 b: a coil end; 55: an axle; 61 c: a partition wall (axial wall portion); 94: a 4 th flow path (refrigerant flow path); 94 a: an inflow section; 94 c: a 1 st branch part; 94 f: a 2 nd branch part; 96: an oil pump (pump); j1: a motor axis; o: oil (refrigerant).

Detailed Description

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

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.

The motor axis J1 shown in the drawings as appropriate extends in the Y-axis direction, i.e., the left-right direction of the vehicle. In the following description, unless otherwise specified, a direction parallel to the motor axis J1 is simply referred to as an "axial direction", a radial direction about the motor axis J1 is simply referred to as a "radial direction", and a circumferential direction about the motor axis J1, that is, a direction around the motor axis J1 is simply referred to as a "circumferential direction". In the present specification, the "parallel direction" also includes a substantially parallel direction, and the "perpendicular direction" also includes a substantially perpendicular direction.

The 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 for these vehicles. 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 case 6, an oil pump 96, a cooler 97, a pipe 10, and an inverter unit 8.

The housing 6 accommodates the motor 2 and the transmission device 3 therein. The housing 6 has a motor housing 61, a gear housing 62, and a partition 61 c. 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 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 housing portion 61 is located above the bottom portion 62a of the gear housing portion 62. The partition wall 61c axially partitions the interior of the motor housing 61 and the interior of the gear housing 62. The partition wall 61c is provided with a partition wall opening 68. The partition wall opening 68 connects the inside of the motor housing portion 61 and the inside of the gear housing portion 62. The partition wall 61c is located on the left side of the stator 30. That is, in the present embodiment, the partition wall 61c corresponds to an axial wall portion located on one axial side of the stator 30.

The casing 6 accommodates oil O as a refrigerant therein. In the present embodiment, the oil O is contained in the motor containing section 61 and the gear containing section 62. An oil reservoir P in which the oil supply O is stored is provided in a lower region inside the gear housing 62. The oil O in the oil reservoir P is sent to the inside of the motor housing 61 through an oil passage 90 described later. The oil O sent to the inside of the motor housing 61 is accumulated in the 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 wall opening 68 and returns to the oil reservoir P.

In the present specification, the phrase "oil is contained in a certain portion" may mean that the oil is located in the certain portion during at least a part of the driving of the motor, and the oil is not located in the certain portion when the motor is stopped. For example, in the present embodiment, "the oil O is contained in the motor containing section 61", it is only necessary that the oil O is located in the motor containing section 61 at least in part of the driving process of the motor 2, and all of the oil O in the motor containing section 61 may be moved to the gear containing section 62 through the partition wall opening 68 when the motor 2 is stopped. A part of the oil O fed to the inside of the motor housing portion 61 through the oil passage 90 described later may remain 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 lubrication of the reduction gear 4 and the differential 5. In addition, the oil O is used for cooling the motor 2. As the oil O, it is preferable to use an oil equivalent to an Automatic Transmission lubricating oil (ATF) having a relatively low viscosity so as to realize the functions of a lubricating oil and a cooling oil.

In the present embodiment, the motor 2 is an inner rotor type motor. The motor 2 has a rotor 20, a stator 30, and

bearings

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

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

The shaft 21 extends across the motor housing 61 and the gear housing 62 of the housing 6. The left end of the shaft 21 protrudes into the gear housing 62. A 1 st gear 41 of the transmission device 3, which will be described later, is fixed to the left end of the shaft 21. The shaft 21 is rotatably supported by

bearings

26 and 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 outward of the rotor 20. The stator 30 has a stator core 32 and a coil assembly 33. The stator core 32 is fixed to the inner circumferential surface of the motor housing 61. As shown in fig. 2 and 3, the stator core 32 has a stator core main body 32a and a fixing portion 32 b. As shown in fig. 3, the stator core main body 32a has a cylindrical core back portion 32d extending in the axial direction and a plurality of teeth 32e extending radially inward from the core back portion 32 d. The plurality of teeth 32e are arranged at equal intervals along the circumferential direction over the entire circumference.

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, 4 fixing portions 32b are provided. The 4 fixing portions 32b are arranged at equal intervals over the entire circumference in the circumferential direction.

Of the fixing

portions

32b, 1 fixing portion 32b protrudes upward from the stator core main body 32 a. The other fixing portion 32b of the fixing portions 32b protrudes downward from the stator core main body 32 a. Still another fixing portion 32b of the fixing portions 32b protrudes from the stator core main body 32a toward the front side (+ X side). The remaining 1 fixing portion 32b of the fixing portions 32b protrudes from the stator core main body 32a to the rear side (-X side).

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

As shown in fig. 2, 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. As shown in fig. 3, the through hole 32c is passed through by a bolt 34 extending in the axial direction. The bolt 34 is threaded into the female screw hole 35 shown in fig. 4 through the through hole 32c from the right side (-Y side). The female screw hole 35 is provided in the partition wall 61 c. The bolt 34 is screwed into the female screw hole 35, whereby the fixing portion 32b is fixed to the partition wall 61 c. Thus, the stator 30 is fixed to the housing 6 by the bolts 34.

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

The coil assembly 33 has coil ends 33a, 33b projecting from the stator core 32 in the axial direction. The coil end 33a is a portion protruding rightward from the stator core 32. The coil end 33b is a portion protruding leftward from the stator core 32. The coil end 33a includes a portion of each coil 31 included in the coil assembly 33 that protrudes to the right side of the stator core 32. The coil end 33b includes a portion of each coil 31 included in the coil assembly 33 that protrudes to the left side of the stator core 32. As shown in fig. 2, in the present embodiment, the coil ends 33a and 33b are annular around the motor axis J1. Although not shown, the coil ends 33a and 33b may include a binding member or the like that binds the coils 31, or may include a crossover that connects the coils 31 to each other.

As shown in fig. 1, the rotor 20 is rotatably supported by

bearings

26 and 27. The

bearings

26 and 27 are ball bearings, for example. The bearing 26 is a bearing that rotatably supports a portion of the rotor 20 located on the right side of the stator core 32. In the present embodiment, the bearing 26 supports a portion of the shaft 21 located on the right side of the portion to which the rotor 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 located on the left side of the stator core 32. In the present embodiment, the bearing 27 supports a portion of the shaft 21 located on the left side of the portion to which the rotor body 24 is fixed. The bearing 27 is held by the partition wall 61 c.

The transmission device 3 is housed in the gear housing 62 of the housing 6. The transmission device 3 is connected to the motor 2. More specifically, the transmission device 3 is connected to the left end of the shaft 21. The transmission device 3 has a reduction 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 according to 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 1 st gear 41, a 2 nd gear 42, a 3 rd gear 43, and an intermediate shaft 45.

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

The torque output from the motor 2 is transmitted to the ring gear 51 of the differential device 5 via the shaft 21, the 1 st gear 41, the 2 nd gear 42, the counter shaft 45, and the 3 rd gear 43 in this order. The gear ratio of each gear, the number of gears, and the like can be variously changed according to a required reduction ratio. In the present embodiment, the reduction gear 4 is a parallel shaft 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 box not shown, a pair of pinion gears not shown, a pinion shaft not shown, and a pair of side gears not shown. The ring gear 51 rotates about a differential axis J3 parallel to the motor axis J1. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4.

The motor 2 is provided with an oil passage 90 through which the oil O circulates inside the casing 6. The oil passage 90 is a path of the oil O that supplies the oil O from the oil reservoir P to the motor 2 and is guided to the oil reservoir P again. The oil passage 90 is provided across the inside of the motor housing 61 and the inside of the gear housing 62.

In addition, in the present specification, the "oil passage" refers to a path of oil. Therefore, the "oil passage" is a concept as follows: the oil supply device includes not only a "flow path" in which oil flows in one direction stably, but also a path in which oil is temporarily retained and a path in which oil is dropped. The path where the oil supply temporarily stays includes, for example, a reservoir or the like in which the oil is stored.

The oil passage 90 has a 1 st oil passage 91 and a 2 nd oil passage 92. The 1 st oil passage 91 and the 2 nd oil passage 92 are configured such that oil supply O circulates inside the casing 6. The 1 st oil passage 91 has a lift path 91a, a shaft supply path 91b, a shaft inner path 91c, and a rotor inner path 91 d. Further, a 1 st reservoir 93 is provided in a path of the 1 st oil path 91. The 1 st reservoir 93 is provided in the gear housing 62.

The lift path 91a is a path for lifting the oil O from the oil reservoir P by the rotation of the ring gear 51 of the differential device 5 and receiving the oil O from the 1 st reservoir 93. The 1 st reservoir 93 is open on the upper side. The 1 st reservoir 93 receives the oil O kicked up by the ring gear 51. Further, the 1 st reservoir 93 receives not only the oil O raised by the ring gear 51 but also the oil O raised by the 2 nd gear 42 and the 3 rd gear 43, such as in a case where the liquid surface S of the oil reservoir P is high immediately after the motor 2 is driven.

The shaft supply path 91b guides the oil O from the 1 st reservoir 93 to the hollow portion 22 of the shaft 21. The shaft inner path 91c is a path through which the oil O passes in the hollow portion 22 of the shaft 21. The rotor inner path 91d is a path through which the oil flows from the communication hole 23 of the shaft 21 to the stator 30 through the inside of the rotor main body 24.

In the in-shaft path 91c, a centrifugal force accompanying rotation of the rotor 20 is applied to the oil O inside the rotor 20. 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, and the oil O stored in the 1 st reservoir 93 is sucked into the rotor 20, so that the path inside the rotor 20 is filled with the oil O.

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

In the 2 nd oil passage 92, the oil O is pumped up from the oil reservoir P and supplied to the stator 30. Oil pump 96, cooler 97, and pipe 10 are provided in 2 nd oil passage 92. The 2 nd oil passage 92 has a 1 st flow passage 92a, a 2 nd flow passage 92b, a 3 rd flow passage 92c, and a 4 th flow passage 94. In the present embodiment, the 4 th flow passage 94 corresponds to a refrigerant flow passage through which oil O as a refrigerant flows. That is, the driving device 1 of the present embodiment has the 4 th flow passage 94 as the refrigerant flow passage.

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

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

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

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

The portion of the inflow portion 94a other than the connection portion 94b is manufactured by, for example, drilling with a drill from the front side (+ X side) of the housing 6. The front end of the inflow portion 94a is closed by screwing a bolt 95 a. The connection portion 94b of the inflow portion 94a is formed by drilling a hole from the left side (+ Y side) of the partition wall 61c with a drill, for example. Although not shown, the left end of the connecting portion 94b is closed by screwing a bolt.

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

The 1 st branch 94c has: an extension 94d extending linearly upward and obliquely rearward from the connection portion 94 b; and a connecting portion 94e connected to an upper end of the extension portion 94 d. The connection portion 94e is an upper end portion of the 1 st branch portion 94c, and is a portion connected to the 1 st pipe 11 described later. The inner diameter of the connecting portion 94e is larger than the inner diameter of the extending portion 94 d. The connection portion 94e is manufactured by drilling a hole with a drill from the upper side of the housing 6, for example. The upper end of the connecting portion 94e is closed by screwing the bolt 95 b. The extension portion 94d is manufactured by, for example, performing hole machining obliquely downward and forward from the upper side of the housing 6 through the inside of the connecting portion 94e with a drill.

The 2 nd branch portion 94f is a portion that branches from the inflow portion 94a and extends to a 2 nd pipe 12 described later. In the present embodiment, the 2 nd branch portion 94f extends obliquely upward from the connection portion 94b toward the front side. The 2 nd branch portion 94f extends linearly with an inclination to the right side (-Y side) with respect to the front-rear direction. The radial position of the front (+ X side) end of the 2 nd branch portion 94f is substantially the same as the radial position of the fixed portion 32 b. The front (+ X side) end of the 2 nd branch portion 94f is located above the front fixing portion 32 b. The front end of the 2 nd branch portion 94f is arranged at substantially the same position as the front fixing portion 32b in the front-rear direction. The 2 nd branch portion 94f is formed by, for example, drilling from the left side (+ Y side) of the partition wall 61c via the inside of the connecting portion 94b with a drill.

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

As shown in fig. 1, the tube 10 extends in an axial direction. The left end of the tube 10 is fixed to the partition wall 61 c. As shown in fig. 2, the tube 10 includes a 1 st tube 11 and a 2 nd tube 12. That is, the driving device 1 has the 1 st tube 11 and the 2 nd tube 12. In the present embodiment, the 1 st tube 11 and the 2 nd tube 12 are cylindrical tubes extending linearly in the axial direction. The 1 st and 2

nd tubes

11 and 12 are parallel to each other. As shown in fig. 3, the 1 st pipe 11 and the 2 nd pipe 12 are housed inside the case 6. The 1 st tube 11 and the 2 nd tube 12 are located radially outside the stator 30. The 1 st pipe 11 and the 2 nd pipe 12 are arranged at a circumferential interval from each other. The radial position of the 1 st tube 11 is, for example, the same as the radial position of the 2 nd tube 12.

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

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

The small diameter portion 11b is an end portion of the 1 st tube 11 on the left side (+ Y side). The small diameter portion 11c is an end portion on the right side (-Y side) of the 1 st tube 11. The outer diameters of the

small diameter portions

11b and 11c are smaller than the outer diameter of the 1 st pipe body portion 11 a. The 1 st tube 11 is fixed to the partition wall 61c such that the small diameter portion 11b is inserted into the partition wall 61c from the right side. The small diameter portion 11b is open to the left. As shown in fig. 4, the small diameter portion 11b opens to the connection portion 94e of the 1 st branch portion 94 c. Thereby, the 1 st tube 11 is connected to the 4 th flow path 94.

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

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

As shown in fig. 5, the 1 st pipe 11 has a plurality of 1 st oil supply ports 13 and a plurality of 2 nd oil supply ports 14. In the present embodiment, the 1 st oil supply port 13 and the 2 nd oil supply port 14 correspond to refrigerant supply ports for supplying a refrigerant to the stator 30. The oil O flowing into the 1 st pipe 11 is discharged from the 1 st oil supply port 13 and the 2 nd oil supply port 14. The 1 st oil supply port 13 and the 2 nd oil supply port 14 are provided on the outer peripheral surface of the 1 st pipe 11. The 1 st oil supply port 13 and the 2 nd oil supply port 14 are holes penetrating the 1 st pipe 11 from the inner peripheral surface to the outer peripheral surface. The 1 st oil supply port 13 and the 2 nd oil supply port 14 are, for example, circular. As shown in fig. 4 and 5, the 1 st oil supply port 13 and the 2 nd oil supply port 14 face downward.

In the present embodiment, a plurality of 1 st oil supply ports 13 are provided at both axial end portions of the 1 st pipe body portion 11 a. For example, 4 first oil supply ports 13 are provided at both axial ends of the 1 st pipe body 11 a. The 41 st oil supply ports 13 provided at the right side (-Y side) end of the 1 st tube body portion 11a are arranged in a zigzag manner in the circumferential direction. The 41 st oil supply ports 13 provided at the right end of the 1 st pipe body portion 11a include 1 st oil supply port 13 opening directly downward, 21 st oil supply ports 13 opening obliquely forward to the lower side, and 1 st oil supply port 13 opening obliquely rearward to the lower side. The 41 st oil supply ports 13 provided at the left (+ Y side) end of the 1 st tube body portion 11a are arranged in the same manner as the 41 st oil supply ports 13 provided at the right side portion of the 1 st tube body portion 11a, except for the axial position.

As shown in fig. 2, 41 st oil supply ports 13 disposed on the right side (-Y side) among the plurality of 1 st oil supply ports 13 are located on the upper side of the coil end 33 a. The 41 st oil supply ports 13 provided on the left side (+ Y side) among the plurality of 1 st oil supply ports 13 are located on the upper side of the coil end 33 b. Therefore, the oil O discharged from the 1 st oil supply port 13 is supplied to the coil ends 33a and 33b from above. That is, in the present embodiment, the 1 st oil supply port 13 is a supply port that supplies the oil O to the coil ends 33a, 33 b.

The 2 nd oil supply port 14 is provided in the axial center portion of the 1 st pipe 11. In the present embodiment, 2 nd oil supply ports 14 are provided at intervals in the axial direction at the axial direction center portion of the 1 st pipe body portion 11 a. As shown in fig. 3, in the present embodiment, the 2 nd oil supply port 14 opens diagonally forward to the lower side. As shown in fig. 2 and 3, the 2 nd oil supply port 14 is located on the upper side of the stator core 32. Therefore, the oil O discharged from the 2 nd oil supply port 14 is supplied to the stator core 32 from the upper side. That is, in the present embodiment, the 2 nd oil supply port 14 is a supply port that supplies the oil O to the stator core 32.

In the present specification, the phrase "the refrigerant supply port is directed downward in the vertical direction" means that the refrigerant supply port may be directed directly downward or the refrigerant supply port may be directed obliquely with respect to the direction directly downward, as long as the direction of the refrigerant supply port includes a downward component. As described above, in the present embodiment, the 1 st oil supply port 13 as the refrigerant supply port includes the 1 st oil supply port 13 directed directly downward, the 1 st oil supply port 13 directed in a direction obliquely inclined forward with respect to the direct downward direction, and the 1 st oil supply port 13 directed in a direction obliquely inclined rearward with respect to the direct downward direction. In the present embodiment, the 2 nd oil supply port 14 serving as the refrigerant supply port is oriented in a direction inclined obliquely forward with respect to the vertical direction. In the present embodiment, the phrase "the 2 nd oil supply port 14 faces downward" may mean that the 2 nd oil supply port 14 faces, for example, directly downward, or may face in a direction inclined rearward from the directly downward direction.

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

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

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

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

As shown in fig. 2, the 2 nd pipe 12 has a plurality of 3 rd oil supply ports 15. In the present embodiment, the 3 rd oil supply port 15 corresponds to a refrigerant supply port for supplying a refrigerant to the stator 30. The oil O flowing into the 2 nd pipe 12 is discharged from the 3 rd oil supply port 15. The 3 rd oil supply port 15 is provided on the outer peripheral surface of the 2 nd pipe 12. More specifically, the 3 rd oil supply port 15 is provided on the outer peripheral surface of the 2 nd pipe body 12 a. The 3 rd oil supply ports 15 are arranged at intervals in the axial direction. For example, 6 3 rd oil supply ports 15 are provided. The 3 rd oil supply port 15 is a hole penetrating the 2 nd pipe 12 from the inner peripheral surface to the outer peripheral surface. The 3 rd oil supply port 15 has a circular shape, for example.

As shown in fig. 3, the 3 rd oil supply port 15 faces upward. In the present embodiment, the 3 rd oil supply port 15 faces obliquely upward and rearward. The 3 rd oil supply port 15 is located on the front side (+ X side) of the stator core 32. The oil O discharged from the 3 rd oil supply port 15 is injected obliquely rearward toward the upper side and supplied to the outer peripheral surface of the stator core main body 32 a. That is, in the present embodiment, the 3 rd oil supply port 15 is a supply port that supplies the oil O to the stator core 32.

In the present specification, the phrase "the refrigerant supply port is directed upward" may be used as long as the direction of the refrigerant supply port includes an upward component, and the refrigerant supply port may be directed directly upward or the refrigerant supply port may be directed in a direction inclined with respect to the direction directly upward. As described above, the 3 rd oil supply port 15 of the present embodiment is directed in a direction inclined obliquely rearward with respect to the straight upward direction. In the present embodiment, the phrase "the 3 rd oil supply port 15 faces upward" may mean that the 3 rd oil supply port 15 faces, for example, directly upward, or may face in a direction inclined obliquely forward with respect to directly upward.

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 electricity. The oil pump 96 sucks up the oil O from the oil reservoir P through the 1 st flow path 92a, and supplies the oil O to the motor 2 through the 2 nd flow path 92b, the cooler 97, the 3 rd flow path 92c, the 4 th flow path 94, and the pipe 10. That is, the oil pump 96 sends the oil O stored in the casing 6 to the 4 th flow path 94, the 1 st pipe 11, and the 2 nd pipe 12. Therefore, the oil O can be easily delivered to the 1 st pipe 11 and the 2 nd pipe 12.

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

In this way, the oil O can be supplied from the 1 st pipe 11 and the 2 nd pipe 12 to the stator 30, and the stator 30 can be cooled. The oil O flowing into the inflow portion 94a can be branched at the 1 st branch portion 94c and the 2 nd branch portion 94f and supplied to the 1 st pipe 11 and the 2 nd pipe 12, respectively. Therefore, it is easier to suppress the deviation between the amount of the oil O supplied to the 1 st pipe 11 and the amount of the oil O supplied to the 2 nd pipe 12, compared to the case where the oil O is made to flow from one pipe 10 to the other pipe 10 of the 1 st pipe 11 and the 2 nd pipe 12. Further, since the path for supplying the oil O to each pipe 10 is easily shortened at the same time, the temperature of the oil O supplied to the stator 30 is easily maintained relatively low. Therefore, the stator 30 is easily cooled appropriately.

The oil O supplied from the 1 st pipe 11 and the 2 nd pipe 12 to the stator 30 drops downward and is accumulated in the lower region in the motor housing 61. The oil O stored in the lower region of the motor housing portion 61 moves to the oil reservoir P of the gear housing portion 62 through the partition wall opening 68 provided in the partition wall 61 c. As described above, the 2 nd oil passage 92 supplies the oil O to the stator 30.

Cooler 97 shown in fig. 1 cools oil O passing through 2 nd oil passage 92. The cooler 97 is connected to the 2 nd flow path 92b and the 3 rd flow path 92 c. The 2 nd flow path 92b and the 3 rd flow path 92c are connected via an internal flow path of the cooler 97. A cooling water pipe 98 through which cooling water cooled by a radiator not shown passes is connected to the cooler 97. The oil O passing through the cooler 97 is cooled by heat exchange with the cooling water passing through the cooling water pipe 98. Further, an inverter unit 8 is provided in a path of the cooling water pipe 98. The cooling water passing through the cooling water pipe 98 cools the inverter unit 8. As shown in fig. 3 and 4, in the present embodiment, the inverter unit 8 is fixed to the rear side (-X side) of the motor housing portion 61. The inverter unit 8 supplies electric power to the motor 2 to control the motor 2.

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

The 4 th flow path 94 is provided in the partition wall 61c positioned on the left side of the stator 30. Therefore, the 4 th flow channel 94 can be disposed at a position axially overlapping the stator 30. This makes it easy to dispose the 4 th flow path 94 without interfering with the fixing portion 32b of the stator 30. Further, the housing 6 can be prevented from being increased in size in the radial direction, compared to a case where the 4 th flow channel 94 is provided on the outer side in the radial direction of the stator 30, for example. Further, since the 4 th flow path 94 is provided in the partition wall 61c of the casing 6, the entire size of the drive device 1 can be reduced more easily than in the case where a flow path connecting the 1 st tube 11 and the 2 nd tube 12 by piping or the like is provided outside the casing 6. Therefore, according to the present embodiment, the drive device 1 can be prevented from being increased in size.

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

In addition, according to the present embodiment, the 1 st tube 11 and the 2 nd tube 12 are arranged with the fixing portion 32b interposed therebetween in the circumferential direction. Therefore, the 1 st tube 11 and the 2 nd tube 12 can be arranged at positions that do not interfere with the fixing portion 32b, and the 1 st tube 11 and the 2 nd tube 12 can be arranged radially close to the stator core main body 32 a. Therefore, the oil O can be easily supplied from the 1 st pipe 11 and the 2 nd pipe 12 to the stator 30, and the drive device 1 can be prevented from being increased in size in the radial direction.

In addition, according to the present embodiment, the 1 st pipe 11 and the 2 nd pipe 12 linearly extend in the axial direction. Therefore, the drive device 1 can be prevented from being increased in size in the radial direction, as compared with the case where the 1 st pipe 11 and the 2 nd pipe 12 are bent and extended in the radial direction. Further, since the shape of the 1 st tube 11 and the shape of the 2 nd tube 12 can be simplified, the 1 st tube 11 and the 2 nd tube 12 can be easily manufactured. In addition, the 1 st tube 11 and the 2 nd tube 12 are easily arranged to face the stator 30 in a wide range in the axial direction. Therefore, the oil O is easily supplied from the 1 st pipe 11 and the 2 nd pipe 12 to a wide range in the axial direction of the stator 30. Therefore, the stator 30 can be cooled more favorably.

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

Specifically, in the present embodiment, the 1 st pipe 11 is positioned above the stator 30, and the 1 st oil supply port 13 and the 2 nd oil supply port 14 of the 1 st pipe 11 face downward. Therefore, the oil O can be discharged downward from the 1 st pipe 11 toward the stator 30. This allows the oil O from the 1 st pipe 11 to flow from the upper side to the lower side of the stator 30 by gravity, and facilitates cooling of the entire stator 30.

In the present embodiment, the 2 nd pipe 12 is positioned on the front side of the stator 30, and the 3 rd oil supply port 15 of the 2 nd pipe 12 faces upward. Therefore, the oil O discharged upward from the 3 rd oil supply port 15 can be supplied to the upper portion of the stator 30. This allows the oil O from the 2 nd pipe 12 to flow from the upper side to the lower side of the stator 30 by gravity, and facilitates cooling of the entire stator 30. In particular, in the present embodiment, the 3 rd oil supply port 15 is directed obliquely rearward upward. Therefore, the oil O discharged from the 3 rd oil supply port 15 easily reaches the upper portion of the stator 30. This facilitates further cooling of the stator 30 by the oil O discharged from the 2 nd pipe 12.

In addition, according to the present embodiment, the 2 nd oil supply port 14 of the 1 st pipe 11 and the 3 rd oil supply port 15 of the 2 nd pipe 12 are supply ports for supplying the oil O to the stator core 32. Therefore, the stator core 32 can be appropriately cooled by the oil O supplied from the 1 st pipe 11 and the 2 nd pipe 12.

As shown in fig. 3, in the present embodiment, the 1 st pipe 11 is positioned on the rear side of the upper fixing portion 32 b. Therefore, the oil O discharged from the 2 nd oil supply port 14 of the 1 st pipe 11 easily flows to the rear side of the upper fixing portion 32 b. Thereby, the oil O is easily supplied to the rear portion of the stator core 32 by the 1 st tube 11. On the other hand, the 2 nd pipe 12 is positioned further forward than the upper fixing portion 32 b. Therefore, the oil O discharged upward from the 3 rd oil supply port 15 of the 2 nd pipe 12 is easily supplied to the portion ahead of the upper fixing portion 32 b. Thereby, the oil O is easily supplied to the front side portion of the stator core 32 by the 2 nd tube 12. Therefore, the oil O is easily supplied to both sides of the stator core 32 in the front-rear direction by the 1 st pipe 11 and the 2 nd pipe 12, and the entire stator core 32 is easily cooled.

In addition, according to the present embodiment, the 1 st oil supply port 13 of the 1 st pipe 11 is a supply port that supplies the oil O to the coil ends 33a, 33 b. Therefore, the coil ends 33a and 33b can be appropriately cooled by the oil O supplied from the 1 st pipe 11. In the present embodiment, the 1 st pipe 11 is located above the stator 30, and therefore the oil O from the 1 st oil supply port 13 can be supplied from above the coil ends 33a, 33 b. This enables the oil O from the 1 st oil supply port 13 to flow from the upper side to the lower side of the coil ends 33a and 33b by gravity. Therefore, the oil O is easily supplied to the entire coil ends 33a and 33b, and the entire coil ends 33a and 33b are easily cooled.

In addition, according to the present embodiment, the 1 st oil supply ports 13 of the 1 st pipes 11 are disposed above the coil ends 33a and 33b, respectively. Therefore, the amount of oil O supplied from the 1 st pipe 11 to the coil ends 33a and 33b can be increased. This enables the coil 31, which is a heat generating body, to be appropriately cooled, and the stator 30 to be cooled more favorably.

In addition, according to the present embodiment, the plurality of 1 st oil supply ports 13 located above the coil ends 33a and 33b are arranged in a zigzag shape in the circumferential direction. Therefore, the plurality of 1 st oil supply ports 13 arranged in the circumferential direction are alternately arranged with their axial positions shifted. Therefore, the oil O can be supplied to the entire coil ends 33a and 33b more easily than when the axial positions of the plurality of 1 st oil supply ports 13 located above the coil ends 33a and 33b are the same.

In addition, according to the present embodiment, the 1 st oil supply port 13 located above the coil ends 33a and 33b includes the 1 st oil supply port 13 obliquely forward toward the lower side and the 1 st oil supply port 13 obliquely rearward toward the lower side. Therefore, the oil O supplied from the plurality of 1 st oil supply ports 13 is easily supplied to both the front and rear portions of the coil ends 33a and 33b, and the oil O is easily supplied to the entire coil ends 33a and 33 b. This enables the coil ends 33a and 33b to be cooled more favorably, and the stator 30 to be cooled more favorably.

In addition, according to the present embodiment, the right end of the 1 st tube 11 is closed by the mounting member 16, and the right end of the 2 nd tube 12 is closed by the mounting member 17. In the present embodiment, the end portion on the right side of the 1 st pipe 11 is the end portion on the opposite side of the side where the oil O flows into the 1 st pipe 11. The end on the right side of the 2 nd pipe 12 is the end on the opposite side of the side where the oil supply O flows into the 2 nd pipe 12. That is, the end portion of each tube opposite to the side into which the oil O flows is closed. Therefore, the pressure of the oil O flowing in each pipe is easily made higher than in the case where the end portion of each pipe opposite to the side into which the oil O flows is opened. This makes it easy to strongly inject the oil O from the oil supply port of each pipe. Therefore, the oil O discharged from each oil supply port is easily appropriately supplied to the stator 30.

In particular, in the 2 nd pipe 12 of the present embodiment, the 3 rd oil supply port 15 faces upward. Therefore, the oil O can be strongly injected upward from the 3 rd oil supply port 15. This makes it easier for the oil O discharged from the 3 rd oil supply port 15 to reach the portion of the stator core 32 located further upward. Therefore, the oil O discharged from the 2 nd pipe 12 can be easily supplied to a wide range of the stator core 32, and the stator core 32 can be cooled more favorably.

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 be supplied to the stator to 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.

The 1 st pipe and the 2 nd pipe may be disposed at any position as long as they are located radially outward of the stator and are disposed at intervals in the circumferential direction. For example, at least one of the 1 st tube and the 2 nd tube may be positioned at a lower side of the stator, or may be positioned at a rear side of the stator. The 1 st pipe and the 2 nd pipe may be disposed on the same side with respect to the stator. For example, both the 1 st tube and the 2 nd tube may be positioned above the stator.

The shape of the 1 st tube and the shape of the 2 nd tube are not particularly limited. The 1 st and 2 nd tubes may be in the shape of a square cylinder. The 1 st tube and the 2 nd tube can extend in a bending way or in a curve way. At least 1 refrigerant supply port of the 1 st tube may be provided. At least 1 refrigerant supply port of the 2 nd pipe may be provided. The coolant supply port may be any supply port that supplies coolant to the stator, and may not include a supply port that supplies coolant to the stator core, or a supply port that supplies coolant to the coil end. In the 1 st tube and the 2 nd tube, an end portion opposite to a side into which the refrigerant flows may be opened.

Other tubes than the 1 st tube and the 2 nd tube may be provided. In this case, the other tubes may have a refrigerant supply port for supplying the refrigerant to the stator, as in the case of the 1 st tube and the 2 nd tube, or may not have a refrigerant supply port for supplying the refrigerant to the stator. The other pipe may have a supply port for supplying a lubricant to a bearing such as a rotor.

The refrigerant flow path connecting the 1 st tube and the 2 nd tube may have any shape as long as it is provided in the axial wall portion. The refrigerant flow path may be a flow path for conveying the refrigerant flowing in from one of the 1 st tube and the 2 nd tube to the other tube. The axial wall portion is not particularly limited as long as it is a wall portion located on one side in the axial direction of the stator. For example, in the above-described embodiment, the wall portion 61b positioned on the right side of the stator 30 may be an axial wall portion provided with a refrigerant flow path. The pump may be a mechanical pump. The pump may not be provided.

The driving device is not particularly limited as long as it can move the target object using a motor as a power source. The drive device may also have no 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 axis extends is not particularly limited. The motor axis may extend in the vertical direction. In the present specification, the phrase "the motor axis extends in the horizontal direction perpendicular to the vertical direction" includes a case where the motor axis extends in a substantially horizontal direction, in addition to a case where the motor axis extends strictly in the horizontal direction. That is, in the present specification, the "motor axis extends in the horizontal direction perpendicular to the vertical direction" may be such that the motor axis is slightly inclined with respect to the horizontal direction.

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 inconsistent with each other.

Claims

1. A drive device, comprising:

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

a 1 st pipe and a 2 nd pipe located radially outside the stator and arranged at intervals in a circumferential direction around the motor axis;

a housing that houses the motor, the 1 st tube, and the 2 nd tube therein; and

a refrigerant flow path which connects the 1 st tube and the 2 nd tube and through which a refrigerant flows,

the 1 st tube and the 2 nd tube each have a refrigerant supply port for supplying the refrigerant to the stator,

the housing has an axial wall portion on one axial side of the stator,

the refrigerant flow path is provided in the axial wall portion.

2. The drive apparatus according to claim 1,

the stator core of the stator includes:

a stator core body; and

a fixing portion protruding radially outward from an outer peripheral surface of the stator core main body and fixed to the housing,

the refrigerant flow path has a portion passing through a position radially inward of the fixing portion.

3. The drive device according to claim 2,

the 1 st pipe and the 2 nd pipe are disposed with the fixing portion interposed therebetween in a circumferential direction around the motor axis.

4. The drive device according to any one of claims 1 to 3,

the 1 st pipe and the 2 nd pipe linearly extend in an axial direction of the motor axis.

5. The drive device according to any one of claims 1 to 4,

the motor axis extends in a horizontal direction perpendicular to the vertical direction.

6. The drive apparatus according to claim 5,

the 1 st pipe is positioned on the upper side of the stator in the vertical direction,

the refrigerant supply port of the 1 st pipe faces downward in the vertical direction.

7. The drive device according to claim 5 or 6,

the 2 nd pipe is positioned at one side of the stator in the horizontal direction,

the refrigerant supply port of the 2 nd pipe faces upward in the vertical direction.

8. The drive device according to any one of claims 1 to 7,

the refrigerant supply port includes a supply port that supplies the refrigerant to a stator core of the stator.

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

the stator has a coil assembly having a plurality of coils,

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

the refrigerant supply port includes a supply port that supplies the refrigerant to the coil end.

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

the refrigerant flow path includes:

an inflow portion into which the refrigerant flows;

a 1 st branch portion that branches from the inflow portion and extends to the 1 st tube; and

a 2 nd branch part branched from the inflow part and extending to the 2 nd tube.

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

the drive device also has a pump for delivering the refrigerant,

the housing accommodates the refrigerant inside thereof,

the pump delivers the refrigerant stored in the casing to the refrigerant flow path, the 1 st tube, and the 2 nd tube.

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

the drive device is mounted on a vehicle,

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