JP7310491B2 - drive - Google Patents

Description

The present invention relates to a driving device.

2. Description of the Related Art A rotary electric machine is known that cools a stator with a plurality of coolant flow paths through which coolant flows. For example, Patent Literature 1 describes a rotating electric machine that cools a stator by supplying cooling oil from a plurality of pipes.

JP 2019-9967 A

In the rotating electric machine as described above, it has been demanded to cool the stator more efficiently with coolant supplied from a plurality of coolant flow paths.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a driving device having a structure capable of improving cooling efficiency of a stator.

One aspect of the drive device of the present invention includes a motor having a rotor rotatable about a motor shaft, a stator positioned radially outward of the rotor, and a plurality of coolant passages through which coolant flows. Prepare. The stator has a stator core and a coil assembly having a plurality of coils. The coil assembly has coil ends that axially protrude from the stator core. The plurality of coolant channels includes first coolant channels and second coolant channels. A first supply port for supplying the coolant to the stator core is provided in the first coolant channel and the second coolant channel. In the first coolant channel and the second coolant channel, only the first coolant channel is provided with a second supply port for supplying the coolant to the coil end.

According to one aspect of the present invention, it is possible to improve the cooling efficiency of the stator in the driving device.

FIG. 1 is a schematic configuration diagram schematically showing the driving device of the first embodiment. FIG. 2 is a perspective view showing the stator, first pipe, and second pipe of the first embodiment. FIG. 3 is a cross-sectional view showing part of the drive device of the first embodiment, taken along line III--III in FIG. FIG. 4 is a cross-sectional view showing part of the drive device of the first embodiment, taken along line IV-IV in FIG. FIG. 5 is a perspective view showing the first pipe of the first embodiment; FIG. FIG. 6 is a left side view of part of the stator, the first pipe, and the second pipe of the first embodiment. FIG. 7 is a left side view of part of the stator, the first pipe, and the second pipe in the modification of the first embodiment. FIG. 8 is a left side view of part of the stator, the first pipe, and the second pipe of the second embodiment. FIG. 9 is a left side view of the stator, first pipe, and second pipe of the third embodiment.

In the following description, the vertical direction is defined based on the positional relationship when the driving device 1 of the present embodiment shown in each drawing is mounted on a vehicle positioned on a horizontal road surface. Also, 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 vertically upward, and the -Z side is vertically downward. In the following description, the vertically upper side is simply called "upper side", and the vertically lower side is simply called "lower side". The X-axis direction is a direction orthogonal to the Z-axis direction and is the front-rear direction of the vehicle on which the driving 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 orthogonal to both the X-axis direction and the Z-axis direction, and is the left-right direction of the vehicle, that is, the vehicle width direction. In the following embodiments, the +Y side is the left side of the vehicle and the -Y side is the right side of the vehicle. The front-rear direction and the left-right direction are horizontal directions orthogonal to the vertical direction. In the following embodiments, the front side corresponds to one side in the horizontal direction.

Note that the positional relationship in the longitudinal 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 appropriately shown in each figure extends in the Y-axis direction, that is, in the lateral direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the motor axis J1 is simply referred to as the "axial direction", the radial direction about the motor axis J1 is simply referred to as the "radial direction", and the motor axis J1 is referred to as the "radial direction". The circumferential direction around the center, that is, the circumference of the motor shaft J1 is simply referred to as the "circumferential direction". In this specification, "parallel directions" include substantially parallel directions, and "perpendicular directions" include substantially perpendicular directions.

<First Embodiment>
A drive device 1 of the present embodiment shown in FIG. 1 is mounted on a vehicle using a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), etc., and is used as the power source. be done. As shown in FIG. 1, the driving device 1 includes a motor 2, a transmission device 3 including a reduction gear 4 and a differential 5, a housing 6, an oil pump 96, a cooler 97, a plurality of pipes 10, Prepare. In addition, in this embodiment, the driving device 1 does not include an inverter unit. In other words, the driving device 1 has a separate structure from the inverter unit.

Housing 6 accommodates motor 2 and transmission device 3 therein. The housing 6 has a motor housing portion 61, a gear housing portion 62, and a partition wall 61c. The motor accommodating portion 61 is a portion that accommodates a rotor 20 and a stator 30, which will be described later. The gear housing portion 62 is a portion that houses the transmission device 3 therein. The gear housing portion 62 is positioned on the left side of the motor housing portion 61 . A bottom portion 61 a of the motor housing portion 61 is located above a bottom portion 62 a of the gear housing portion 62 . The partition wall 61c partitions the interior of the motor housing portion 61 and the interior of the gear housing portion 62 in the axial direction. A partition opening 68 is provided in the partition 61c. 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 61 c is positioned on the left side of the stator 30 . That is, in the present embodiment, the partition 61c corresponds to an axial wall located on one side of the stator 30 in the axial direction.

The housing 6 accommodates oil O as a coolant inside. In this embodiment, the oil O is accommodated inside the motor accommodating portion 61 and the gear accommodating portion 62 . An oil reservoir P in which oil O is accumulated is provided in a lower region inside the gear housing portion 62 . The oil O in the oil sump P is sent to the inside of the motor accommodating portion 61 through an oil passage 90, which will be described later. The oil O sent into the motor housing portion 61 accumulates in the lower region inside the motor housing portion 61 . At least part of the oil O accumulated inside the motor housing portion 61 moves to the gear housing portion 62 through the partition wall opening 68 and returns to the oil reservoir P.

In this specification, the phrase "oil is contained inside a certain portion" means that the oil is positioned inside the certain portion at least partly while the motor is running. There may be no oil inside a part when the is stopped. For example, in the present embodiment, the phrase “the oil O is housed inside the motor housing portion 61” means that the oil O is positioned inside the motor housing portion 61 at least partly while the motor 2 is being driven. However, when the motor 2 is stopped, all of the oil O inside the motor accommodating portion 61 may pass through the partition wall opening 68 and move to the gear accommodating portion 62 . A part of the oil O sent into the motor accommodating portion 61 through the oil passage 90, which will be described later, may remain inside the motor accommodating portion 61 when the motor 2 is stopped.

The oil O circulates through an oil passage 90, which will be described later. The oil O is used for lubricating the reduction gear 4 and the differential gear 5 . Also, the oil O is used for cooling the motor 2 . As the oil O, it is preferable to use an oil equivalent to automatic transmission fluid (ATF), which has a relatively low viscosity, in order to function as a lubricating oil and a cooling oil.

In this embodiment, the motor 2 is an inner rotor type motor. The motor 2 includes a rotor 20 , a stator 30 and bearings 26 and 27 . The rotor 20 is rotatable around a horizontally extending motor shaft J1. The rotor 20 has a shaft 21 and a rotor body 24 . Although not shown, the rotor body 24 has a rotor core and rotor magnets fixed to the rotor core. Torque of the rotor 20 is transmitted to the transmission device 3 .

The shaft 21 extends axially around the motor shaft J1. The shaft 21 rotates around the motor axis J1. The shaft 21 is a hollow shaft provided with a hollow portion 22 inside. A communication hole 23 is provided in the shaft 21 . The communication hole 23 extends in the radial direction and connects the hollow portion 22 and the outside of the shaft 21 .

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

The stator 30 faces the rotor 20 with a gap in the radial direction. More specifically, the stator 30 is positioned radially outside the rotor 20 . Stator 30 has a stator core 32 and a coil assembly 33 . The stator core 32 is fixed to the inner peripheral surface of the motor accommodating portion 61 . As shown in FIGS. 2 and 3, the stator core 32 has a stator core body 32a and a fixing portion 32b. As shown in FIG. 3, the stator core body 32a has a cylindrical core back 32d extending in the axial direction and a plurality of teeth 32e extending radially inward from the core back 32d. The multiple teeth 32e are arranged at regular intervals along the circumferential direction.

The fixing portion 32b protrudes radially outward from the outer peripheral surface of the stator core body 32a. The fixed portion 32b is a portion fixed to the housing 6 . A plurality of fixing portions 32b are provided at intervals along the circumferential direction. For example, four fixing portions 32b are provided. The four fixing portions 32b are arranged at regular intervals along the circumference.

One of the fixed portions 32b protrudes upward from the stator core body 32a. Another one of the fixed portions 32b protrudes downward from the stator core body 32a. Still another one of the fixed portions 32b protrudes forward (+X side) from the stator core body 32a. The remaining fixed portion 32b protrudes rearward (−X side) from the stator core body 32a.

In this embodiment, the fixed portion 32b protruding upward from the stator core body 32a is the upper fixed portion 32f positioned above the motor shaft J1. In the present embodiment, the fixing portion 32b protruding forward from the stator core body 32a is the front fixing portion 32g. The front fixing portion 32g is positioned, for example, below the motor shaft J1.

As shown in FIG. 2, the fixed portion 32b extends in the axial direction. The fixed portion 32b extends, for example, from the left (+Y side) end of the stator core body 32a to the right (−Y side) end of the stator core body 32a. The fixed portion 32b has a through hole 32c that axially penetrates the fixed portion 32b. As shown in FIG. 3, an axially extending bolt 34 is passed through the through hole 32c. The bolt 34 is passed through the through hole 32c from the right side (-Y side) and screwed into the female screw hole 35 shown in FIG. The female screw hole 35 is provided in the partition wall 61c. By tightening the bolt 34 into the female screw hole 35, the fixing portion 32b is fixed to the partition wall 61c. Stator 30 is thus fixed to housing 6 by bolts 34 .

As shown in FIG. 1, the coil assembly 33 has a plurality of coils 31 attached to the stator core 32 along the circumferential direction. A plurality of coils 31 are attached to respective teeth 32e of stator core 32 via insulators (not shown). A plurality of coils 31 are arranged along the circumferential direction. More specifically, the plurality of coils 31 are arranged at regular intervals along the circumferential direction. Although not shown, the coil assembly 33 may have a binding member or the like that binds the coils 31, or may have a connecting wire that connects the coils 31 to each other.

The coil assembly 33 has coil ends 33 a and 33 b axially projecting from the stator core 32 . The coil end 33a is a portion that protrudes from the stator core 32 to the right. The coil end 33b is a portion that protrudes from the stator core 32 to the left. Coil end 33 a includes a portion of each coil 31 included in coil assembly 33 that protrudes to the right from stator core 32 . Coil end 33 b includes a portion of each coil 31 included in coil assembly 33 that protrudes leftward from stator core 32 . As shown in FIG. 2, in this embodiment, the coil ends 33a and 33b have an annular shape centered on the motor shaft J1. Although not shown, the coil ends 33a and 33b may include a binding member or the like that binds the coils 31, or may include a connecting wire that connects the coils 31 to each other.

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

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 this 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 61c.

The transmission device 3 is housed in the gear housing portion 62 of the housing 6 . A 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 speed reduction device 4 and a differential device 5 . Torque output from the motor 2 is transmitted to the differential gear 5 via the reduction gear 4 .

A 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 gear 5 . The reduction gear 4 has a first gear 41 , a second gear 42 , a third gear 43 and an intermediate shaft 45 .

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

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

The differential gear 5 is connected to the motor 2 via the reduction gear 4 . The differential gear 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle. The differential gear 5 transmits the same torque to the axle shafts 55 of both the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle turns. Thus, in this embodiment, the transmission device 3 transmits the torque of the motor 2 to the axle 55 of the vehicle via the speed reduction device 4 and the differential device 5 . The differential gear 5 has a ring gear 51, a gear housing (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 around a differential shaft J3 parallel to the motor shaft J1. 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 housing 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 leads it to the oil reservoir P again. The oil passage 90 is provided across the inside of the motor housing portion 61 and the inside of the gear housing portion 62 .

In this specification, the term "oil passage" means a route of oil. Therefore, "oil passage" is a concept that includes not only a "flow path" that creates a steady flow of oil in one direction, but also a passage that temporarily retains oil and a passage that drips oil. The path for temporarily retaining oil includes, for example, a reservoir that retains oil.

The oil passage 90 has a first oil passage 91 and a second oil passage 92 . The first oil passage 91 and the second oil passage 92 circulate the oil O inside the housing 6 respectively. The first oil passage 91 has a raking path 91a, a shaft supply path 91b, an in-shaft path 91c, and an in-rotor path 91d. Also, a first reservoir 93 is provided in the route of the first oil passage 91 . The first reservoir 93 is provided inside the gear housing portion 62 .

The raking path 91 a is a path for raking up the oil O from the oil reservoir P by the rotation of the ring gear 51 of the differential gear 5 and receiving the oil O in the first reservoir 93 . The first reservoir 93 opens upward. The first reservoir 93 receives the oil O scooped up by the ring gear 51 . Further, when the liquid surface S of the oil reservoir P is high, such as immediately after the motor 2 is driven, the first reservoir 93 is raised by the second gear 42 and the third gear 43 in addition to the ring gear 51. Also receives oil O.

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

Centrifugal force is applied to the oil O inside the rotor 20 in the shaft inner path 91c as the rotor 20 rotates. As a result, the oil O is continuously splashed radially outward from the rotor 20 . Further, as the oil O scatters, the passage inside the rotor 20 becomes negative pressure, the oil O accumulated in the first reservoir 93 is sucked into the rotor 20, and the passage inside the rotor 20 is filled with the oil O.

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

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

The first flow path 92 a , the second flow path 92 b and the third flow path 92 c are provided in the wall of the housing 6 . The first flow path 92 a connects the oil reservoir P and the oil pump 96 . A second flow path 92 b connects the oil pump 96 and the cooler 97 . The third channel 92 c connects the cooler 97 and the fourth channel 94 . The third flow path 92 c is provided, for example, on the front (+X side) wall of the motor housing portion 61 .

The fourth flow path 94 is provided in the partition wall 61c. The fourth flow path 94 connects a first pipe 11 and a second pipe 12 of the pipes 10, which will be described later. As shown in FIG. 4, the fourth flow path 94 has an inflow portion 94a, a first branch portion 94c, and a second branch portion 94f. The inflow portion 94a is a portion of the fourth flow path 94 into which the oil O flows from the third flow path 92c. The inflow portion 94a extends rearward (−X side) from the third flow path 92c. The inflow portion 94a is positioned on the front side (+X side) of the shaft 21 and linearly extends in the front-rear direction in the radial direction. The inner diameter of the inflow portion 94a is larger at the front end. In the present embodiment, the front end of the inflow portion 94a is the radial outer end of the inflow portion 94a.

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

The rear (-X side) end of the inflow portion 94a is a connection portion 94b that connects the first branch portion 94c and the second branch portion 94f. The inner diameter of the inflow portion 94a is large at the connection portion 94b. The connecting portion 94b is located radially inward of the fixing portion 32b.

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

The first branch portion 94c is a portion that branches from the inflow portion 94a and extends to the first pipe 11, which will be described later. The first branch portion 94c extends obliquely upward and rearward from the rear (−X side) end of the inflow portion 94a, that is, from the connection portion 94b. The first branch portion 94c passes through a portion of the partition wall 61c that is positioned below the upper fixing portion 32f and above the shaft 21, and extends to the upper end of the partition wall 61c. The radial position of the upper end of the first branch portion 94c is substantially the same as the radial position of the fixed portion 32b. An upper end portion of the first branch portion 94c is located on the rear side of the upper fixing portion 32f.

The first branch portion 94c has an extension portion 94d linearly extending obliquely rearward from the connection portion 94b, and a connection portion 94e connected to an upper end portion of the extension portion 94d. The connection portion 94e is an upper end portion of the first branch portion 94c, and is a portion to which the first pipe 11, which will be described later, is connected. The inner diameter of the connecting portion 94e is larger than the inner diameter of the extending portion 94d. The connecting portion 94e is made by, for example, drilling from the upper side of the housing 6 with a drill. The upper end of the connecting portion 94e is closed by tightening the bolt 95b. The extending portion 94d is formed, for example, by drilling from the upper side of the housing 6 through the inside of the connecting portion 94e and obliquely forward from the lower side with a drill.

The second branch portion 94f is a portion that branches from the inflow portion 94a and extends to the second pipe 12, which will be described later. In the present embodiment, the second branch portion 94f extends obliquely upward and forward from the connecting portion 94b. The second branch portion 94f extends linearly while being inclined to the right (-Y side) with respect to the front-rear direction. The radial position of the front (+X side) end of the second branch portion 94f is substantially the same as the radial position of the fixed portion 32b. The front (+X side) end of the second branch portion 94f is located above the front fixing portion 32g. The front end portion of the second branch portion 94f and the front fixing portion 32g are arranged at approximately the same position in the front-rear direction. The second branch portion 94f is made by, for example, drilling from the left side (+Y side) of the partition wall 61c through the inside of the connection portion 94b.

In the fourth flow path 94, the rear portion of the inflow portion 94a, the portion of the extending portion 94d excluding the upper end portion, and the rear portion of the second branch portion 94f are located closer to each other than the fixed portion 32b of the partition wall 61c. It is provided in a portion located radially inward. That is, in the present embodiment, the fourth flow path 94 has a portion passing radially inward of the fixed portion 32b.

As shown in FIG. 1, the pipe 10 extends axially. The left end of the pipe 10 is fixed to the partition wall 61c. As shown in FIG. 2 , the plurality of pipes 10 includes first pipes 11 and second pipes 12 . In this embodiment, the pipe 10 corresponds to a coolant flow path through which coolant flows. Further, in the present embodiment, the first pipe 11 corresponds to a first coolant channel through which a coolant flows, and the second pipe 12 corresponds to a second coolant channel through which a coolant flows. That is, the driving device 1 includes a first pipe 11 as a first coolant channel and a second pipe 12 as a second coolant channel.

In this embodiment, the first pipe 11 and the second pipe 12 are cylindrical and extend linearly in the axial direction. The first pipe 11 and the second pipe 12 are parallel to each other. As shown in FIG. 3 , the first pipe 11 and the second pipe 12 are housed inside the housing 6 . The first pipe 11 and the second pipe 12 are positioned radially outside the stator 30 . The first pipe 11 and the second pipe 12 are circumferentially spaced from each other. The radial position of the first pipe 11 and the radial position of the second pipe 12 are, for example, the same.

In this specification, the phrase "the first pipe and the second pipe extend linearly in the axial direction of the motor shaft" means that the first pipe and the second pipe strictly extend linearly in the axial direction. , the case where the first pipe and the second pipe extend substantially straight in the axial direction. That is, in the present embodiment, "the first pipe 11 and the second pipe 12 extend linearly in the axial direction" means, for example, that the first pipe 11 and the second pipe 12 extend slightly inclined with respect to the axial direction. may be In this case, the direction in which the first pipe 11 is inclined with respect to the axial direction and the direction in which the second pipe 12 is inclined with respect to the axial direction may be the same or may be different.

In this embodiment, the first pipe 11 is positioned above the stator 30 . In this embodiment, the radial position of the first pipe 11 is the same as the radial position of the fixing portion 32b. The first pipe 11 is positioned on the rear side (-X side) of the upper fixing portion 32f. As shown in FIG. 5, the first pipe 11 includes a first pipe main body portion 11a, a small diameter portion 11b provided at the left (+Y side) end of the first pipe main body portion 11a, and a first pipe main body portion and a small diameter portion 11c provided at the right (−Y side) end of 11a.

The small diameter portion 11 b is the left (+Y side) end of the first pipe 11 . The small diameter portion 11c is the right (−Y side) end of the first pipe 11 . The outer diameters of the small diameter portions 11b and 11c are smaller than the outer diameter of the first pipe body portion 11a. The first pipe 11 is fixed to the partition wall 61c by inserting the small diameter portion 11b into the partition wall 61c from the right side. The small diameter portion 11b opens to the left. As shown in FIG. 4, the small-diameter portion 11b opens to the connection portion 94e of the first branch portion 94c. Thereby, the first pipe 11 is connected to the fourth flow path 94 .

As shown in FIG. 5, a mounting member 16 is provided at the right (−Y side) end of the first pipe 11 . The mounting member 16 has a rectangular plate shape with a plate surface facing the axial direction. The mounting member 16 has a concave portion 16a recessed rightward from the left (+Y side) surface. The right end of the first pipe 11, that is, the small-diameter portion 11c is fitted and fixed in the recess 16a. The right end of the first pipe 11 is closed by the mounting member 16 .

The mounting member 16 has a hole portion 16b that axially penetrates the mounting member 16 . As shown in FIG. 2, a bolt 18 is passed through the hole 16b from the right side (-Y side). The bolt 18 passes through the hole 16b and is tightened from the right side to the projecting portion 61d shown in FIG. The protruding portion 61d protrudes radially inward from the inner peripheral surface of the motor accommodating portion 61 . The mounting member 16 is fixed to the projecting portion 61d by tightening the bolt 18 to the projecting portion 61d. As a result, the right end of the first pipe 11 is fixed to the motor accommodating portion 61 via the mounting member 16 .

As shown in FIG. 5 , the first pipe 11 has multiple first supply ports 13 and multiple second supply ports 14 . In this embodiment, the first supply port 13 and the second supply port 14 correspond to coolant supply ports that supply coolant to the stator 30 . The oil O flowing into the first pipe 11 is discharged from the first supply port 13 and the second supply port 14 . The first supply port 13 and the second supply port 14 are provided on the outer peripheral surface of the first pipe 11 . The first supply port 13 and the second supply port 14 are holes penetrating the first pipe 11 from the inner peripheral surface to the outer peripheral surface. The first supply port 13 and the second supply port 14 are circular, for example. As shown in FIGS. 2 and 5, the first supply port 13 and the second supply port 14 face downward.

In this embodiment, the first supply port 13 is provided in the central portion of the first pipe 11 in the axial direction. In the present embodiment, two first supply ports 13 are provided at an axial center portion of the first pipe main body portion 11a with an interval therebetween in the axial direction. As shown in FIG. 3, in the present embodiment, the first supply port 13 opens obliquely forward on the lower side. As shown in FIGS. 2 and 3 , the first supply port 13 is positioned above the stator core 32 . Therefore, the oil O discharged from the first supply port 13 is supplied to the stator core 32 from above. That is, in this embodiment, the first supply port 13 is a supply port that supplies the oil O to the stator core 32 .

As shown in FIGS. 2 and 5, in the present embodiment, a plurality of second supply ports 14 are provided at both ends of the first pipe main body portion 11a in the axial direction. For example, four second supply ports 14 are provided at both axial end portions of the first pipe main body portion 11a. The four second supply ports 14 provided at the left (+Y side) end of the first pipe body portion 11a are arranged in a zigzag pattern along the circumferential direction. As shown in FIG. 6, the four second supply ports 14 provided at the left end of the first pipe main body 11a include one second supply port 14 that opens directly below and one that opens obliquely forward on the lower side. and one second supply port 14 opening obliquely rearward on the lower side.

Of the two second supply ports 14 that open obliquely forward on the lower side, the direction in which the second supply port 14 that is inclined with respect to the vertical direction is the same as the direction in which the first supply port 13 opens. do. Of the two second supply ports 14 that open diagonally forward on the lower side, the second supply port 14 that is inclined with respect to the vertical direction is the front side of the two second supply ports 14 that open diagonally forward on the lower side ( +X side).

As shown in FIGS. 2 and 5, the four second supply ports 14 provided at the right (−Y side) end of the first pipe main body 11a are located in the same direction as the first pipe except for their axial positions. They are arranged in the same manner as the four second supply ports 14 provided at the left (+Y side) end of the main body 11a.

As shown in FIG. 2, among the plurality of second supply ports 14, the four second supply ports 14 provided on the right side (-Y side) are positioned above the coil end 33a. Four second supply ports 14 provided on the left side (+Y side) of the plurality of second supply ports 14 are positioned above the coil end 33b. Therefore, the oil O discharged from the second supply port 14 is supplied to the coil ends 33a and 33b from above. That is, in this embodiment, the second supply port 14 is a supply port for supplying the oil O to the coil ends 33a and 33b.

In this specification, "the supply port faces downward in the vertical direction" means that the direction of the supply port includes a downward component, and the supply port may face straight down. may be oriented in a tilted direction with respect to directly below. As described above, in the present embodiment, the second supply port 14 faces directly downward, the second supply port 14 faces obliquely forward with respect to directly below, and the second supply port 14 faces downward. and a second supply port 14 oriented obliquely to the rear. Further, in the present embodiment, the first supply port 13 is oriented obliquely forward with respect to the bottom. In the present embodiment, "the first supply port 13 faces downward" means that the first supply port 13 may, for example, face directly downward, or may face in a direction tilted rearward with respect to directly downward. may be

The second pipe 12 is located on the front side (+X side) of the stator 30 . More specifically, the second pipe 12 is positioned in front of the stator core 32 . In this embodiment, the radial position of the second pipe 12 is the same as the radial position of the fixing portion 32b. The second pipe 12 is positioned below the first pipe 11 . The second pipe 12 is positioned above the front fixing portion 32g. An upper fixing portion 32f is positioned between the first pipe 11 and the second pipe 12 in the circumferential direction. That is, the first pipe 11 and the second pipe 12 are arranged with the upper fixing portion 32f interposed therebetween in the circumferential direction.

As shown in FIG. 2, the second pipe 12 has a second pipe body portion 12a and a small diameter portion 12b provided at the left (+Y side) end of the second pipe body portion 12a. Although not shown, the second pipe 12, like the first pipe 11, has a small diameter portion provided at the right (−Y side) end of the second pipe body portion 12a.

The small diameter portion 12 b is the left (+Y side) end of the second pipe 12 . The outer diameter of the small diameter portion 12b is smaller than the outer diameter of the second pipe body portion 12a. The second pipe 12 is fixed to the partition wall 61c by inserting the small diameter portion 12b into the partition wall 61c from the right side (-Y side). The small diameter portion 12b opens to the left. As shown in FIG. 4, the small diameter portion 12b opens at the front (+X side) end of the second branch portion 94f. Thereby, the second pipe 12 is connected to the fourth flow path 94 . Therefore, the first pipe 11 and the second pipe 12 are connected to each other via the fourth flow path 94 . More specifically, the first pipe 11 and the second pipe 12 are connected to each other via the first branch portion 94c, the connection portion 94b, and the second branch portion 94f.

As shown in FIG. 2, a mounting member 17 is provided at the right (−Y side) end of the second pipe 12 . The mounting member 17 has a rectangular plate shape with a plate surface facing the axial direction. The right end of the second pipe 12 is fixed to the mounting member 17 in the same manner as the first pipe 11 . The right end of the second pipe 12 is closed by the mounting member 17 . Although not shown, the mounting member 17 is fixed to the projecting portion 61e shown in FIG. As a result, the right end of the second pipe 12 is fixed to the motor accommodating portion 61 via the mounting member 17 . The protruding portion 61 e protrudes radially inward from the inner peripheral surface of the motor accommodating portion 61 .

As shown in FIG. 2 , the second pipe 12 has multiple first supply ports 15 . In this embodiment, the first supply port 15 corresponds to a coolant supply port that supplies coolant to the stator 30 . The oil O flowing into the second pipe 12 is discharged from the first supply port 15 . The first supply port 15 is provided on the outer peripheral surface of the second pipe 12 . More specifically, the first supply port 15 is provided on the outer peripheral surface of the second pipe body portion 12a. The plurality of first supply ports 15 are arranged at intervals along the axial direction. The number of first supply ports 15 provided in the second pipe 12 is greater than the number of first supply ports 13 provided in the first pipe 11 . Six first supply ports 15 are provided, for example. The first supply port 15 is a hole penetrating the second pipe 12 from the inner peripheral surface to the outer peripheral surface. The first supply port 15 is circular, for example.

As shown in FIG. 3, the first supply port 15 faces upward. In this embodiment, the first supply port 15 faces obliquely upward and rearward. The first supply port 15 is located on the front side (+X side) of the stator core 32 . As shown in FIG. 6, the oil O discharged from the first supply port 15 is jetted upward and obliquely rearward, and is supplied to the outer peripheral surface of the stator core body 32a. That is, in this embodiment, the first supply port 15 is a supply port that supplies the oil O to the stator core 32 .

In this specification, "the supply port faces upward" means that the direction of the supply port includes an upward component. It may be oriented in an oblique direction with respect to the top. As described above, the first supply port 15 of the present embodiment is oriented obliquely to the rear with respect to the top. In the present embodiment, "the first supply port 15 faces upward" means that the first supply port 15 may, for example, face directly upward, or may face in a direction that is obliquely forward with respect to the upward direction. may be

When viewed in the axial direction, the direction DI in which the first supply port 15 opens is such that the tangent line TL passing through the first supply port 15 and contacting the outer peripheral surface of the stator core 32 extends from the first supply port 15 toward the outer peripheral surface of the stator core 32 . It faces upward rather than the extending direction. Therefore, it is easy for the oil O injected from the first supply port 15 to reach a portion of the stator core 32 located above the contact point TP between the tangent line TL and the outer peripheral surface of the stator core 32 . As a result, the oil O can be preferably easily supplied to the upper portion of the stator core 32, and the stator 30 can be easily cooled. Therefore, the cooling efficiency of the stator 30 can be improved.

In the present embodiment, the tangent line TL is, for example, a tangent line that passes through the center point CP at the end portion of the circular first supply port 15 provided on the outer peripheral surface of the second pipe 12 and is in contact with the outer peripheral surface of the stator core body 32a. . The direction DI in which the first supply port 15 opens is the direction in which the first supply port 15 penetrates from the inner peripheral surface to the outer peripheral surface of the second pipe 12 . The angle θ formed by the direction DI in which the first supply port 15 opens with respect to the direction in which the tangent line TL extends from the first supply port 15 toward the outer peripheral surface of the stator core 32 is, for example, about 5° or more and 15° or less. The angle θ is the smaller angle between the tangent line TL and the imaginary line IL passing through the center point CP and extending parallel to the direction in which the first supply port 15 penetrates the second pipe 12 when viewed in the axial direction. be.

As described above, the first pipe 11 and the second pipe 12 are provided with the first supply ports 13 and 15 for supplying the oil O to the stator core 32 . On the other hand, the second supply port 14 for supplying the oil O to the coil ends 33 a and 33 b is provided in the first pipe 11 but not provided in the second pipe 12 . That is, of the first pipe 11 and the second pipe 12, only the first pipe 11 is provided with the second supply port 14 for supplying the oil O to the coil ends 33a and 33b.

It should be noted that in this specification, "in the first refrigerant flow path and the second refrigerant flow path, only the first refrigerant flow path is provided with the second supply port that supplies the refrigerant to the coil end" means that the first refrigerant flow path It is sufficient that the path is provided with the second supply port, but the second coolant channel is not provided with the second supply port. That is, the statement that "in the first coolant flow path and the second coolant flow path, only the first coolant flow path is provided with the second supply port for supplying the coolant to the coil end" means that the second coolant flow path If no supply port is provided, a channel having a second supply port for supplying coolant to the coil ends may be provided in addition to the first coolant channel. For example, in the present embodiment, a pipe other than the first pipe 11 and the second pipe 12 may be provided, and the pipe may be provided with a second supply port for supplying the oil O to the coil ends 33a and 33b.

In this embodiment, the first supply port 13, the second supply port 14, and the first supply port 15 have the same shape and size. That is, the opening area of the first supply port 13, the opening area of the second supply port 14, and the opening area of the first supply port 15 are, for example, the same. Moreover, as described above, the total number of the first supply ports 13 is two. The number of second supply ports 14 is eight in total. The number of first supply ports 15 is six in total. Therefore, the total opening area of the first supply ports 13 provided in the first pipe 11 is smaller than the total opening area of the first supply ports 15 provided in the second pipe 12 . Further, the total opening area of the second supply ports 14 provided in the first pipe 11 is equal to the total opening area of the first supply ports 13 provided in the first pipe 11 and the first opening area provided in the second pipe 12 . It is larger than the total opening area of the supply port 15 .

In the present specification, "total opening area of a certain supply port" is an area obtained by adding all the opening areas of a plurality of certain supply ports when a plurality of certain supply ports are provided, When only one supply port is provided, it is the opening area of the supply port. That is, for example, in the present embodiment, the total opening area of the first supply ports 13 is the sum of the opening areas of the two first supply ports 13 .

The oil pump 96 shown in FIG. 1 is a pump that sends oil O as a refrigerant. In this embodiment, the oil pump 96 is an electric pump driven by electricity. The oil pump 96 sucks up the oil O from the oil sump P via the first flow path 92a and supplies it to the second flow path 92b, the cooler 97, the third flow path 92c, the fourth flow path 94, and the pipes. 10 to supply oil O to the motor 2 . That is, the oil pump 96 sends the oil O housed inside the housing 6 to the fourth flow path 94 , the first pipe 11 and the second pipe 12 . Therefore, the oil O can be easily sent to the first pipe 11 and the second pipe 12 .

The oil O sent to the third flow path 92c by the oil pump 96 flows into the fourth flow path 94 from the inflow portion 94a. As shown in FIG. 4, the oil O that has flowed into the inflow portion 94a flows rearward (−X side) and branches into the first branch portion 94c and the second branch portion 94f. The oil O that has flowed into the first branch portion 94 c flows into the first pipe 11 from the left (+Y side) end of the first pipe 11 . The oil O that has flowed into the second branch portion 94f flows into the second pipe 12 from the left end of the second pipe 12 . As described above, the fourth flow path 94 of the present embodiment connects the first pipe 11 and the second pipe 12 and branches to supply the oil O to the first pipe 11 and the second pipe 12. corresponds to That is, the driving device 1 includes the fourth channel 94 as a connecting channel.

The oil O that has flowed into the first pipe 11 flows rightward (−Y side) in the first pipe 11 and is supplied to the stator 30 through the second supply port 14 and the first supply port 13 . The oil O that has flowed into the second pipe 12 flows rightward through the second pipe 12 and is supplied to the stator 30 from the first supply port 15 .

Thus, the oil O can be supplied from the first pipe 11 and the second pipe 12 to the stator 30, and the stator 30 can be cooled. Further, the oil O flowing into the inflow portion 94a can be branched to the first branch portion 94c and the second branch portion 94f and supplied to the first pipe 11 and the second pipe 12, respectively. Therefore, compared to the case where the oil O flows from one of the first pipe 11 and the second pipe 12 to the other pipe 10, the amount of the oil O supplied to the first pipe 11 and the second pipe 12 It is easy to suppress the occurrence of bias in the amount of oil O supplied to the . In addition, since it is easy to shorten both paths until the oil O is supplied to each pipe 10, it is easy to maintain the temperature of the oil O supplied to the stator 30 relatively low. Therefore, it is easy to suitably cool the stator 30 .

The oil O supplied to the stator 30 from the first pipe 11 and the second pipe 12 drips downward and accumulates in the lower region inside the motor accommodating portion 61 . The oil O accumulated in the lower region inside 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 61c. As described above, the second oil passage 92 supplies the oil O to the stator 30 .

Cooler 97 shown in FIG. 1 cools oil O passing through second oil passage 92 . The cooler 97 is connected to the second channel 92b and the third channel 92c. The second flow path 92 b and the third flow path 92 c are connected through the internal flow path of the cooler 97 . The cooler 97 is connected to a cooling water pipe 98 through which cooling water cooled by a radiator (not shown) passes. 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 this embodiment, both the first pipe 11 and the second pipe 12 are provided with the first supply ports 13 and 15 for supplying the oil O to the stator core 32 . Therefore, the stator core 32 can be suitably cooled by the oil O supplied from the first pipe 11 and the second pipe 12 .

Further, according to this embodiment, the first pipe 11 is provided with the second supply port 14 for supplying the oil O to the coil ends 33a and 33b. Therefore, the coil ends 33a and 33b can be suitably cooled by the oil O supplied from the first pipe 11. As shown in FIG.

Further, according to the present embodiment, of the first pipe 11 and the second pipe 12, only the first pipe 11 is provided with the second supply port 14 for supplying the oil O to the coil ends 33a and 33b. That is, the second pipe 12 is not provided with the second supply port 14 . Therefore, compared to the case where the second pipe 12 is provided with the second supply port 14, the total opening area of the supply ports provided in the second pipe 12 can be made smaller. As a result, the oil O can be easily pumped to the second pipe 12 and easily jetted from the first supply port 15 toward the stator core 32 . Therefore, the oil O can be preferably supplied to the stator core 32 from the first supply port 15 of the second pipe 12, and the cooling efficiency of the stator 30 can be improved.

Further, according to this embodiment, the first supply port 15 of the second pipe 12 faces upward. Therefore, it is easy to suitably inject the oil O upward from the first supply port 15 . This makes it easier for the oil O discharged from the first supply port 15 to reach the upper portion of the stator core 32 . Therefore, the oil O from the second pipe 12 can flow from the upper side to the lower side of the stator core 32 using gravity, and the oil O discharged from the second pipe 12 can be easily supplied over a wide range of the stator core 32. . Therefore, the stator core 32 can be cooled more appropriately, and the cooling efficiency of the stator 30 can be further improved.

In particular, in the configuration in which the second pipe 12 is positioned on the front side of the stator core 32 as in the present embodiment, it is difficult to supply the oil O from the second pipe 12 to the upper portion of the stator core 32 . In contrast, since the oil O can be easily injected upward from the first supply port 15 , the oil O can be easily supplied from the second pipe 12 to the upper portion of the stator core 32 . That is, the effect of suitably injecting the oil O from the first supply port 15 of the second pipe 12 is particularly useful in a configuration in which the second pipe 12 is positioned on one side of the stator core 32 in the horizontal direction.

Further, in the present embodiment, the first supply port 15 faces obliquely upward and rearward. Therefore, it is easy for the oil O discharged from the first supply port 15 to reach the upper portion of the stator 30 . This makes it easier to cool the stator 30 with the oil O discharged from the second pipe 12 .

Further, according to the present embodiment, the first pipe 11 and the second pipe 12 are connected by the fourth channel 94 as a connecting channel. Therefore, for example, the oil O can be supplied to both the first pipe 11 and the second pipe 12 by sending the oil O to the inflow portion 94a of the fourth flow path 94 as in the present embodiment. That is, the number of oil passages provided in the housing 6 can be reduced compared to the case where separate oil passages for supplying the oil O to the first pipe 11 and the second pipe 12 are provided. Therefore, it is possible to suppress the housing 6 from increasing in size.

Further, according to the present embodiment, the fourth flow path 94 as a connection flow path branches and supplies the oil O to the first pipe 11 and the second pipe 12 . In this case, the smaller the sum of the sum of the total opening area of the supply ports provided in the first pipe 11 and the total opening area of the supply ports provided in the second pipe 12, the greater the flow from the fourth flow path 94 to the second pipe. The oil O can be easily pumped to the first pipe 11 and the second pipe 12 . Therefore, as described above, by reducing the total opening area of the supply ports provided in the second pipe 12, the total opening area of the supply ports provided in the first pipe 11 and the supply ports provided in the second pipe 12 can be reduced. , and the total opening area of . Thereby, the oil O can be suitably supplied to the stator 30 from both the first pipe 11 and the second pipe 12 . Therefore, the cooling efficiency of the stator 30 can be further improved.

Further, according to the present embodiment, the first pipe 11 and the second pipe 12 are positioned radially outward of the stator 30 and spaced apart in the circumferential direction about the motor shaft J1. Therefore, the first supply port 13 of the first pipe 11 and the first supply port 15 of the second pipe 12 can easily supply the oil O to a wide range in the circumferential direction of the stator core 32 . Therefore, the cooling efficiency of the stator 30 can be further improved.

Further, according to the present embodiment, the first pipe 11 and the second pipe 12 are arranged with the fixing portion 32b interposed therebetween in the circumferential direction. Therefore, the first pipe 11 and the second pipe 12 can be arranged in a position that does not interfere with the fixing portion 32b, and the first pipe 11 and the second pipe 12 can be arranged radially close to the stator core main body 32a. Therefore, the oil O can be easily supplied from the first pipe 11 and the second pipe 12 to the stator 30, and the cooling efficiency of the stator 30 can be further improved. Moreover, it is possible to prevent the driving device 1 from increasing in size in the radial direction. Also, the oil O can be preferably supplied to both sides of the stator core 32 with the fixed portion 32b sandwiched therebetween by the first supply port 13 of the first pipe 11 and the first supply port 15 of the second pipe 12 . As a result, the oil O can be easily supplied to the entire stator core 32, and the cooling efficiency of the stator 30 can be further improved. Note that the oil O injected from the first supply ports 13 and 15 may or may not be supplied to the fixed portion 32b.

Further, as shown in FIG. 3, in the present embodiment, the first pipe 11 is positioned behind the upper fixing portion 32f. Therefore, the oil O discharged from the first supply port 13 of the first pipe 11 tends to flow rearward from the upper fixing portion 32f. This makes it easy to supply the oil O to the rear portion of the stator core 32 through the first pipe 11 . On the other hand, the second pipe 12 is positioned forward of the upper fixing portion 32f. Therefore, the oil O discharged upward from the first supply port 15 of the second pipe 12 is easily supplied to the portion on the front side of the upper fixing portion 32f. This makes it easy to supply the oil O to the front portion of the stator core 32 through the second pipe 12 . Therefore, the first pipe 11 and the second pipe 12 can easily supply the oil O to both sides of the stator core 32 in the front-rear direction, thereby facilitating the cooling of the entire stator core 32 .

Further, according to this embodiment, the first pipe 11 and the second pipe 12 extend linearly in the axial direction. Therefore, compared with the case where the first pipe 11 and the second pipe 12 are bent and extend in the radial direction, it is possible to prevent the driving device 1 from increasing in size in the radial direction. Moreover, since the shape of the first pipe 11 and the shape of the second pipe 12 can be made simple, the first pipe 11 and the second pipe 12 can be easily manufactured. Moreover, it is easy to dispose the first pipe 11 and the second pipe 12 so as to face the stator 30 over a wide range in the axial direction. Therefore, it is easy to supply the oil O to a wide range in the axial direction of the stator 30 from the first pipe 11 and the second pipe 12 . Therefore, the stator 30 can be cooled more appropriately. Therefore, the cooling efficiency of the stator 30 can be further improved.

Further, according to this embodiment, the total opening area of the first supply ports 13 provided in the first pipe 11 is smaller than the total opening area of the first supply ports 15 provided in the second pipe 12 . Therefore, the total opening area of the first supply port 13 provided in the first pipe 11 can be made relatively small. Thereby, even if the first pipe 11 is provided with both the first supply port 13 and the second supply port 14, the total opening area of the supply ports provided in the first pipe 11 can be easily reduced. Therefore, it is easy to pump the oil O to the first pipe 11 . Therefore, it is easy to suitably inject the oil O from the first supply port 13 toward the stator core 32 , and it is easy to suitably supply the oil O to the stator core 32 . Moreover, it is easy to suitably inject the oil O from the second supply port 14 toward the coil ends 33a and 33b, and it is easy to suitably supply the oil O to the coil ends 33a and 33b. Therefore, the cooling efficiency of the stator 30 can be further improved.

Further, according to this embodiment, the total opening area of the second supply ports 14 provided in the first pipe 11 is larger than the total opening area of the first supply ports 13 provided in the first pipe 11 . Therefore, the amount of oil O supplied from the second supply port 14 to the coil ends 33a and 33b can be increased. As a result, the coil 31, which is a heating element, can be suitably cooled, and the cooling efficiency of the stator 30 can be further improved.

Further, according to this embodiment, the first pipe 11 is positioned above the stator 30 . Therefore, it is easy to supply the oil O to the stator 30 from above through the first supply port 13 and the second supply port 14 of the first pipe 11 . Especially in this embodiment, since the first supply port 13 and the second supply port 14 face downward, the oil O can be easily supplied to the upper side of the stator 30 from the first supply port 13 and the second supply port 14 . As a result, the oil O from the first pipe 11 can flow from the upper side to the lower side of the stator 30 using gravity, and the entire stator 30 can be easily cooled. Therefore, the cooling efficiency of the stator 30 can be further improved.

Here, since the coil ends 33a and 33b are not provided with protrusions such as the fixing portion 32b, the oil O is supplied from above the coil ends 33a and 33b through the second supply port 14 of the first pipe 11. As a result, the oil O can be easily made to flow from the upper side to the lower side with respect to both sides of the coil ends 33a and 33b in the front-rear direction using gravity. This makes it easy to supply the oil O to the entire coil ends 33a and 33b by supplying the oil from the second supply port 14 of the first pipe 11, and to easily cool the entire coil ends 33a and 33b. Therefore, even if the second pipe 12 is not provided with the second supply port for supplying the oil O to the coil ends 33a, 33b, the coil ends 33a, 33b can be cooled appropriately.

Further, according to this embodiment, a plurality of second supply ports 14 of the first pipe 11 are arranged above each of the coil ends 33a and 33b. Therefore, the amount of oil O supplied from the first pipe 11 to the coil ends 33a and 33b can be increased. As a result, the coil 31, which is a heating element, can be cooled more preferably, and the stator 30 can be cooled more preferably.

Further, according to the present embodiment, the plurality of second supply ports 14 positioned above the coil ends 33a and 33b are arranged in a zigzag pattern along the circumferential direction. Therefore, the axial positions of the plurality of second supply ports 14 arranged along the circumferential direction are alternately shifted. This makes it easier to supply the oil O to the entire coil ends 33a and 33b than when the axial positions of the plurality of second supply ports 14 located above the coil ends 33a and 33b are the same.

Further, according to the present embodiment, the second supply ports 14 positioned above the respective coil ends 33a and 33b are the second supply ports 14 facing obliquely downward and the second supply ports 14 facing obliquely rearward. 14 and. Therefore, the oil O supplied from the plurality of second supply ports 14 can be easily supplied to both the front and rear portions of the coil ends 33a and 33b, and the oil O can be easily supplied to the entire coil ends 33a and 33b. Thereby, the coil ends 33a and 33b can be cooled more preferably, and the stator 30 can be cooled more preferably.

Further, according to the present embodiment, the first coolant channel and the second coolant channel are pipes 10 . Therefore, compared to the case where the first coolant channel and the second coolant channel are provided by, for example, drilling the housing 6, the first coolant channel and the second coolant channel can be easily formed.

Further, according to this embodiment, the motor shaft J1 extends in a direction perpendicular to the vertical direction. Therefore, by supplying the oil O from the first pipe 11 and the second pipe 12 to the upper side of the stator 30, the oil O can flow from the upper side to the lower side along the circumferential direction of the stator 30 using gravity. . As a result, the oil O is easily supplied to the entire circumference of the stator 30 , and the entire stator 30 is easily cooled by the oil O. Therefore, the cooling efficiency of the stator 30 can be further improved.

Also, the fourth flow path 94 is provided in the partition wall 61 c located on the left side of the stator 30 . Therefore, the fourth flow path 94 can be arranged at a position overlapping the stator 30 in the axial direction. This makes it easy to dispose the fourth flow path 94 while avoiding interference with the fixed portion 32b of the stator 30 . Moreover, compared with the case where the fourth flow path 94 is provided radially outside the stator 30, for example, it is possible to prevent the housing 6 from increasing in size in the radial direction. Further, since the fourth flow path 94 is provided in the partition wall 61c of the housing 6, compared to the case where a flow path connecting the first pipe 11 and the second pipe 12 is provided outside the housing 6 by a pipe or the like, the drive device 1. It is easy to downsize the whole. Therefore, according to the present embodiment, it is possible to prevent the drive device 1 from increasing in size.

Further, according to the present embodiment, the fourth flow path 94 has a portion passing radially inward of the fixing portion 32b. Therefore, it is easier to dispose the fourth flow path 94 while avoiding the fixing portion 32b, and it is possible to further suppress an increase in the size of the housing 6 in the radial direction. Therefore, it is possible to further suppress the increase in size of the drive device 1 .

Further, according to this embodiment, the right end of the first pipe 11 is closed by the mounting member 16 , and the right end of the second pipe 12 is closed by the mounting member 17 . In this embodiment, the right end of the first pipe 11 is the end opposite to the side where the oil O flows into the first pipe 11 . The right end of the second pipe 12 is the end opposite to the side where the oil O flows into the second pipe 12 . That is, of the axial ends of each pipe, the end opposite to the side into which the oil O flows is blocked. Therefore, it is easier to increase the pressure of the oil O flowing through each pipe compared to the case where the end of each pipe in the axial direction opposite to the side into which the oil O flows is open. As a result, the oil O can be easily jetted vigorously from the oil supply port of each pipe. Therefore, it is easy to suitably supply the oil O discharged from each oil supply port to the stator 30 .

(Modification)
As shown in FIG. 7, in the stator 130 of the drive device 101 of this modified example, the stator core 132 does not have the fixed portion 32b projecting radially outward. According to this configuration, the oil O supplied from the first supply port 13 of the first pipe 11 and the first supply port 15 of the second pipe 12 to the outer peripheral surface of the stator core body 32a is prevented from being blocked by the fixed portion 32b. It is possible to move in the circumferential direction on the outer peripheral surface of the stator core body 32a. Therefore, the oil O supplied from the first pipe 11 and the second pipe 12 can be easily spread over the entire circumference of the stator core 132 . Therefore, the cooling efficiency of the stator 130 can be further improved.

<Second embodiment>
As shown in FIG. 8 , in the driving device 201 of this embodiment, the second pipe 212 is positioned above the stator core 32 . Therefore, it is easy to supply the oil O from the upper side to the stator core 32 from the first supply port 215 of the second pipe 212 . As a result, the oil O from the second pipe 212 can be easily flowed from the upper side to the lower side of the stator 30 using gravity, and the stator 30 as a whole can be cooled more easily. Therefore, the cooling efficiency of the stator 30 can be further improved.

In the present embodiment, the second pipe 212 is positioned above a portion of the stator core body 32a positioned on the front side (+X side) of the upper fixing portion 32f. The second pipe 212 is positioned in front of the upper fixing portion 32f. The first supply port 215 of the second pipe 212 faces obliquely downward to the rear side. The oil O supplied to the stator core 32 from the first supply port 215 is suppressed from flowing rearward (−X side) by the upper fixing portion 32f, and flows forward and downward along the outer peripheral surface of the stator core body 32a. . Note that the oil O injected from the first supply port 215 may or may not be supplied to the upper fixing portion 32f.

<Third Embodiment>
As shown in FIG. 9, in the driving device 301 of this embodiment, the first pipe 311 and the second pipe 312 are positioned below the motor shaft J1. The first pipe 311 is located on the rear side (-X side) with respect to the lower end of the stator core body 32a. The second pipe 312 is located on the front side (+X side) with respect to the lower end of the stator core body 32a. In the present embodiment, the first pipe 311 and the second pipe 312 are located radially outside the fixing portion 32b.

In this embodiment, the first supply port 313 and the second supply port 314 of the first pipe 311 face upward. The first supply port 313 and the second supply port 314, for example, face almost straight up. The oil O injected upward from the first supply port 313 passes through the rear side of the stator core 32 from the bottom to the top and is supplied to the upper portion of the stator core 32 . The oil O injected upward from the second supply port 314 passes through the rear sides of the coil ends 33a and 33b from the bottom to the top and is supplied to the upper portions of the coil ends 33a and 33b.

In this embodiment, the first supply port 315 of the second pipe 312 faces upward. The first supply port 315 faces almost straight up, for example. The oil O injected upward from the first supply port 315 passes through the front side of the stator core 32 from the bottom to the top and is supplied to the upper portion of the stator core 32 .

According to this embodiment, since the first pipe 311 and the second pipe 312 are positioned below the motor shaft J1, the oil O flows from the oil reservoir P in the housing 6 to the first pipe 311 and the second pipe 312. It is easy to shorten the oil passage for guiding. This makes it easier to supply the oil O to the first pipe 311 and the second pipe 312 .

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 the oil O has been described, but the invention is not limited to this. The coolant is not particularly limited as long as it can be supplied to the stator to cool the stator. The coolant may be, for example, an insulating liquid or water. When the coolant is water, the surface of the stator may be subjected to an insulation treatment.

The first coolant channel and the second coolant channel may be arranged in any way. The first coolant channel and the second coolant channel may be arranged side by side in the radial direction around the motor shaft, or may be arranged side by side in the axial direction of the motor shaft. At least one of the first coolant channel and the second coolant channel may be positioned below the stator. The first coolant flow path and the second coolant flow path may be arranged on the same side with respect to the stator.

The number of first supply ports and the number of second supply ports provided in the first coolant channel are not particularly limited as long as they are one or more. The number of first supply ports provided in the second coolant channel is not particularly limited as long as it is one or more. The shape and size of the first supply port provided in the first coolant channel may be different from the shape and size of the first supply port provided in the second coolant channel. Other supply ports may be provided in the first coolant channel as long as the first supply port and the second supply port are provided. The second coolant channel may be provided with a supply port other than the first supply port as long as it is not the second supply port that supplies the coolant to the coil end. The first coolant channel and the second coolant channel may be provided with a supply port for supplying oil as a lubricant to a bearing such as a rotor. Other coolant channels than the first coolant channel and the second coolant channel may be provided. In this case, any supply port may be provided in the other coolant channel.

The shape of the first pipe as the first coolant channel and the shape of the second pipe as the second coolant channel are not particularly limited. The first pipe and the second pipe may be square tube-shaped. The first pipe and the second pipe may be bent and extended, or may be curved. In the first pipe and the second pipe, the ends on the side opposite to the side into which the refrigerant flows may be open. The first coolant channel and the second coolant channel may not be pipes. In this case, the first coolant channel and the second coolant channel may be channels configured by holes provided in the housing.

The connection channel that connects the first coolant channel and the second coolant channel may have any shape and may be provided at any position. For example, in the above-described embodiment, the wall portion 61b located on the right side of the stator 30 may be provided with the connection flow path. The connecting channel may be, for example, a branching pipe. A connecting channel may not be provided. In this case, the coolant may flow separately into the first coolant channel and the second coolant channel. The refrigerant flowing into one of the first refrigerant flow path and the second refrigerant flow path may flow into the other of the first refrigerant flow path and the second refrigerant flow path. The pump may be a mechanical pump. A pump may not be provided.

The driving device is not particularly limited as long as it is a device capable of moving a target object using a motor as a power source. The drive device may not have a transmission mechanism. The torque of the motor may be output directly 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. The motor shaft may extend vertically. In this specification, "the motor shaft extends in a direction orthogonal to the vertical direction" means that the motor shaft extends in a direction that is strictly orthogonal to the vertical direction, and also that the motor shaft extends in a direction that is substantially orthogonal to the vertical direction. including cases where it extends to That is, in this specification, "the motor shaft extends in a direction orthogonal to the vertical direction" may mean that the motor shaft is slightly inclined with respect to the horizontal direction orthogonal to the vertical direction. Also, 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 to this. The driving device may include an inverter unit. In other words, the driving device may have an integral structure with the inverter unit.

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

DESCRIPTION OF SYMBOLS 1, 101, 201, 301... Drive device, 2... Motor, 3... Transmission device, 6... Housing, 10... Pipe (refrigerant flow path), 11... First pipe (first refrigerant flow path), 12... Second Pipe (second refrigerant flow path) 13, 15, 215, 313, 315... First supply port 14, 314... Second supply port 20... Rotor 30, 130... Stator 31... Coil 32, 132 Stator core 32a Stator core body 32b Fixed portion 32f Upper fixed portion (fixed portion) 33 Coil assembly 33a, 33b Coil end 55 Axle 94 Fourth flow path (connection flow path ), J1... motor shaft, O... oil (refrigerant)

Claims (14)

a motor having a rotor rotatable about a motor axis and a stator positioned radially outwardly of the rotor;
a plurality of coolant channels in which coolant flows;
with
The stator is
a stator core;
a coil assembly having a plurality of coils;
has
The coil assembly has a coil end axially protruding from the stator core,
the plurality of coolant channels includes a first coolant channel and a second coolant channel;
The first coolant channel and the second coolant channel are provided with a first supply port for supplying the coolant to the stator core,
A driving device, wherein, in the first coolant channel and the second coolant channel, only the first coolant channel is provided with a second supply port for supplying the coolant to the coil end. The driving device according to claim 1, wherein said first supply port of said second coolant channel faces vertically upward. 3. The driving device according to claim 1, wherein said second coolant channel is positioned on one side of said stator in the horizontal direction. 2. A connecting passage connecting said first refrigerant passage and said second refrigerant passage and branching to supply said refrigerant to said first refrigerant passage and said second refrigerant passage. 4. The driving device according to any one of 3 to 4. 5. The first coolant channel and the second coolant channel according to any one of claims 1 to 4, wherein the first coolant channel and the second coolant channel are positioned radially outward of the stator and spaced apart in a circumferential direction about the motor shaft. or the drive device according to claim 1. further comprising a housing that accommodates the motor therein;
The stator core is
a stator core body;
a fixing portion protruding radially outward from the outer peripheral surface of the stator core body and fixed to the housing;
has
6. The driving device according to claim 5, wherein said first coolant flow path and said second coolant flow path are arranged in a circumferential direction around said motor shaft with said fixed portion interposed therebetween. the fixed portion includes an upper fixed portion positioned vertically above the motor shaft,
7. The driving device according to claim 6, wherein said first coolant flow path and said second coolant flow path are arranged in a circumferential direction around said motor shaft with said upper fixing portion sandwiched therebetween. The driving device according to any one of claims 5 to 7, wherein said first coolant channel and said second coolant channel extend linearly in an axial direction of said motor shaft. 9. The apparatus of claim 1, wherein a total opening area of said first supply ports provided in said first coolant flow path is smaller than a total opening area of said first supply ports provided in said second coolant flow path. A drive device according to any one of the preceding claims. 10. The method of claim 1, wherein the total opening area of the second supply ports provided in the first coolant flow path is larger than the total opening area of the first supply ports provided in the first coolant flow path. A drive device according to any one of the preceding claims. The driving device according to any one of claims 1 to 10, wherein the first coolant channel is positioned vertically above the stator. 12. The driving device according to any one of claims 1 to 11, wherein said first coolant channel and said second coolant channel are pipes. 13. The driving device according to any one of claims 1 to 12, wherein the motor shaft extends in a direction perpendicular to the vertical direction. A driving device mounted on a vehicle,
14. A drive system as claimed in any one of claims 1 to 13, further comprising a transmission connected to the motor for transmitting torque of the motor to an axle of the vehicle.

Images