JP2021052522A - Driving device - Google Patents

Abstract

To provide a driving device including a motor provided with passages and having a structure capable of inhibiting enlargement.SOLUTION: A driving device includes a motor and a housing 6 which houses the motor therein. The housing has a wall part 63 provided with a refrigerant passage in which a refrigerant flows. The refrigerant passage has: a first passage part 94a; a branch part 94b connected to the first passage part; and a second passage part and a third passage part 94f which are branched from the branch part and extend with respect to the first passage part. The branch part has an opening 94g opening to one side in a wall thickness direction. The opening is closed by a plug member 64.SELECTED DRAWING: Figure 7

Description

The present invention relates to a drive device.

A rotary electric machine having a plurality of flow paths through which a refrigerant passes is known. For example, Patent Document 1 describes a rotary electric machine that cools a stator by supplying cooling oil to a stator core main body from a plurality of pipes.

JP-A-2019-9967

In the rotary electric machine as described above, in order to provide a plurality of flow paths, for example, it is conceivable to crawl a pipe or the like on the outside of the housing of the rotary electric machine. Specifically, for example, in Patent Document 1, it is conceivable to crawl a pipe or the like on the outside of the housing of a rotary electric machine to provide a path for supplying cooling oil to a plurality of pipes. However, in this case, there is a problem that the entire rotary electric machine tends to be large.

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

One aspect of the drive device of the present invention includes a motor and a housing that houses the motor inside. The housing has a wall portion provided with a refrigerant flow path through which the refrigerant flows. The refrigerant flow path includes a first flow path portion, a branch portion connected to the first flow path portion, and a second flow path portion and a second flow path portion extending from the branch portion with respect to the first flow path portion. It has three flow paths and. The branch portion has an opening that opens on one side in the thickness direction of the wall portion. The opening is closed by a plug member.

According to one aspect of the present invention, it is possible to prevent the drive device including the motor from becoming large.

FIG. 1 is a perspective view showing a driving device of the present embodiment. FIG. 2 is a schematic configuration diagram schematically showing the drive device of the present embodiment. FIG. 3 is a perspective view showing the stator, the first pipe, and the second pipe of the present embodiment. FIG. 4 is a cross-sectional view showing a part of the driving device of the present embodiment, and is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a cross-sectional view showing a part of the driving device of the present embodiment, and is a VV cross-sectional view in FIG. FIG. 6 is a perspective view showing a part of the housing and the plug member of the present embodiment. FIG. 7 is a cross-sectional view showing a part of the housing and the plug member of the present embodiment. FIG. 8 is a perspective view showing a part of the housing of the present embodiment, and is a view seen in the direction in which the second branch flow path portion extends from the branch portion. FIG. 9 is a perspective view showing the first pipe of the present embodiment.

In the following description, the vertical direction will be defined based on the positional relationship when the drive device 1 of the present embodiment shown in each figure is mounted on a vehicle located on a horizontal road surface. Further, in the drawings, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The + Z side is the upper side in the vertical direction, and the −Z side is the lower side in the vertical direction. In the following description, the upper side in the vertical direction is simply referred to as "upper side", and the lower side in the vertical direction is simply referred to as "lower side". The X-axis direction is a direction orthogonal to the Z-axis direction and is a front-rear direction of 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 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-back direction and the left-right direction are horizontal directions orthogonal to the vertical direction. In the following embodiments, the left side corresponds to one side in the axial direction.

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

The motor shaft J1 shown in each figure extends in the Y-axis direction, that is, in the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the motor shaft J1 is simply referred to as the "axial direction", the radial direction centered on the motor shaft J1 is simply referred to as the "radial direction", and the motor shaft J1 is referred to as the motor shaft J1. The circumferential direction around the center, that is, the circumference of the motor shaft J1 is simply referred to as the "circumferential direction". In the present specification, the "parallel direction" includes a substantially parallel direction, and the "orthogonal direction" also includes a substantially orthogonal direction.

The drive device 1 of the present embodiment shown in FIG. 1 is mounted on a vehicle powered by a motor, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), and an electric vehicle (EV), and is used as the power source thereof. Will be done. As shown in FIG. 2, the drive device 1 includes a motor 2, a transmission device 3 including a speed reducer 4 and a differential device 5, a housing 6, an oil pump 96, a cooler 97, and a pipe 10. .. In this embodiment, the drive device 1 does not include the inverter unit. In other words, the drive device 1 has a structure separate from the inverter unit.

The housing 6 houses the motor 2 and the transmission device 3 inside. The housing 6 has a motor accommodating portion 61, a gear accommodating portion 62, and a partition wall 63. The motor accommodating portion 61 is a portion that accommodates the rotor 20 and the stator 30, which will be described later, inside. The gear accommodating portion 62 is a portion accommodating the transmission device 3 inside. The gear accommodating portion 62 is located on the left side of the motor accommodating portion 61. The bottom portion 61f of the motor accommodating portion 61 is located above the bottom portion 62c of the gear accommodating portion 62. The partition wall 63 axially partitions the inside of the motor accommodating portion 61 and the inside of the gear accommodating portion 62. The partition wall 63 is provided with a partition wall opening 68. The partition wall opening 68 connects the inside of the motor accommodating portion 61 and the inside of the gear accommodating portion 62. The partition wall 63 is located on the left side of the stator 30.

The housing 6 houses the oil O as a refrigerant inside. In the present embodiment, the oil O is accommodated inside the motor accommodating portion 61 and inside the gear accommodating portion 62. An oil sump P for accumulating oil O is provided in a lower region inside the gear accommodating portion 62. The oil O in the oil sump P is sent to the inside of the motor accommodating portion 61 by an oil passage 90 described later. The oil O sent to the inside of the motor accommodating portion 61 collects in the lower region inside the motor accommodating portion 61. At least a part of the oil O accumulated inside the motor accommodating portion 61 moves to the gear accommodating portion 62 through the partition wall opening 68 and returns to the oil sump P.

In the present specification, "oil is stored inside a certain part" means that the oil is located inside a certain part at least in a part while the motor is being driven, and the motor may be used. When is stopped, the oil does not have to be located inside a part. For example, in the present embodiment, the fact that the oil O is stored inside the motor housing unit 61 means that the oil O is located inside the motor housing unit 61 at least in a part while the motor 2 is being driven. However, when the motor 2 is stopped, all the oil O inside the motor accommodating portion 61 may have moved to the gear accommodating portion 62 through the partition wall opening 68. A part of the oil O sent to the inside of the motor accommodating portion 61 by the oil passage 90 described later may remain inside the motor accommodating portion 61 when the motor 2 is stopped.

The oil O circulates in the oil passage 90 described later. Oil O is used for lubricating the speed reducer 4 and the differential device 5. Further, 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 fluid (ATF) having a relatively low viscosity in order to perform the functions of the lubricating oil and the cooling oil.

As shown in FIG. 1, in the present embodiment, the housing 6 is configured such that three members, a housing main body 6a, a first lid member 61b, and a second lid member 62b, are fixed in the axial direction. The housing body 6a has a first portion 61a and a second portion 62a connected to the left (+ Y side) end of the first portion 61a. The first portion 61a has a tubular shape that extends in the axial direction and opens to the right side (−Y side). The first portion 61a houses the motor 2 inside. The second portion 62a extends in the front-rear direction and projects to the rear side (−X side) of the first portion 61a. The second portion 62a opens to the left.

The first lid member 61b is fixed to the right side (-Y side) of the housing body 6a. The first lid member 61b closes the opening on the right side of the first portion 61a. The second lid member 62b is fixed to the left side (+ Y side) of the housing body 6a. The second lid member 62b closes the opening on the left side of the second portion 62a. In the present embodiment, the motor accommodating portion 61 is composed of a first portion 61a and a first lid member 61b. In the present embodiment, the gear accommodating portion 62 is composed of a second portion 62a and a second lid member 62b. The inside of the first portion 61a and the inside of the second portion 62a are separated by a partition wall 63. In the present embodiment, the motor accommodating portion 61 corresponds to the first accommodating portion for accommodating the motor 2 inside. The gear accommodating portion 62 corresponds to a second accommodating portion that accommodates the transmission device 3 inside.

As shown in FIG. 2, in the present 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 can rotate about the motor shaft J1 extending in the horizontal direction. The rotor 20 includes a shaft 21 and a rotor body 24. Although not shown, the rotor body 24 has 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 along the axial direction about the motor shaft J1. The shaft 21 rotates about the motor shaft J1. The shaft 21 is a hollow shaft provided with a hollow portion 22 inside. The shaft 21 is provided with a communication hole 23. The communication hole 23 extends in the radial direction 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 projects into the gear accommodating 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. The shaft 21 is rotatably supported by bearings 26 and 27.

The stator 30 faces the rotor 20 in the radial direction with a gap. More specifically, 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 peripheral surface of the motor accommodating portion 61. As shown in FIGS. 3 and 4, the stator core 32 has a stator core main body 32a and a fixing portion 32b. As shown in FIG. 4, the stator core main 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 plurality of teeth 32e are arranged at equal intervals over one circumference along the circumferential direction.

The fixing portion 32b projects radially outward from the outer peripheral surface of the stator core main body 32a. The fixing portion 32b is a portion fixed to the housing 6. A plurality of fixed 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 equal intervals over one circumference in the circumferential direction.

One of the fixing portions 32b projects upward from the stator core main body 32a. The other one of the fixing portions 32b projects downward from the stator core main body 32a. The other one of the fixed portions 32b projects from the stator core main body 32a to the front side (+ X side). The remaining one of the fixing portions 32b projects from the stator core main body 32a to the rear side (−X side).

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

As shown in FIG. 3, the fixing portion 32b extends in the axial direction. The fixing portion 32b extends from, for example, the left end (+ Y side) end of the stator core body 32a to the right side (−Y side) end of the stator core body 32a. The fixing portion 32b has a through hole 32c that penetrates the fixing portion 32b in the axial direction. As shown in FIG. 4, a bolt 34 extending in the axial direction is passed through the through hole 32c. The bolt 34 is passed through the through hole 32c from the right side (−Y side) and tightened into the female screw hole 35 shown in FIG. The female screw hole 35 is provided in the partition wall 63. By tightening the bolt 34 into the female screw hole 35, the fixing portion 32b is fixed to the partition wall 63. In this way, the stator 30 is fixed to the housing 6 by bolts 34.

As shown in FIG. 2, the coil assembly 33 has a plurality of coils 31 attached to the stator core 32 along the circumferential direction. The plurality of coils 31 are respectively mounted on the teeth 32e of the stator core 32 via an insulator (not shown). The plurality of coils 31 are arranged along the circumferential direction. More specifically, the plurality of coils 31 are arranged at equal intervals over one circumference along the circumferential direction. Although not shown, the coil assembly 33 may have a binding member or the like that binds each coil 31, or may have a crossover connecting the coils 31 to each other.

The coil assembly 33 has coil ends 33a, 33b that project axially from the stator core 32. The coil end 33a is a portion protruding to the right from the stator core 32. The coil end 33b is a portion protruding to the left 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. 3, in the present 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 crossover connecting the coils 31 to each other.

As shown in FIG. 2, bearings 26 and 27 rotatably support the rotor 20. The bearings 26 and 27 are, for example, ball bearings. The bearing 26 is a bearing that rotatably supports a portion of the rotor 20 located on the right side of the stator core 32. In the present embodiment, the bearing 26 supports a portion of the shaft 21 located on the right side of the portion to which the rotor body 24 is fixed. The bearing 26 is held by the first lid member 61b that covers the right side of the rotor 20 and the stator 30 in the motor accommodating 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 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 63.

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

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

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

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

The differential device 5 is connected to the motor 2 via the speed reducer 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 both the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle turns. As described above, in the present embodiment, the transmission device 3 transmits the torque of the motor 2 to the axle 55 of the vehicle via the reduction gear 4 and the differential device 5. As a result, the drive device 1 rotates the axle 55 of the vehicle.

The differential device 5 includes 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 about a differential shaft J3 parallel to the motor shaft J1. The torque output from the motor 2 is transmitted to the ring gear 51 via the speed reducer 4.

The motor 2 is provided with an oil passage 90 in 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 sump P to the motor 2 and leads the oil O to the oil sump P again. The oil passage 90 is provided so as to straddle the inside of the motor accommodating portion 61 and the inside of the gear accommodating portion 62.

In addition, in this specification, "oil passage" means the route of oil. Therefore, the "oil passage" is a concept that includes not only a "flow path" that constantly creates a flow of oil in one direction, but also a path for temporarily retaining oil and a path for oil to drip. The route for temporarily retaining the oil includes, for example, a reservoir for storing the oil.

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

The scooping path 91a is a path in which the oil O is scooped up from the oil sump P by the rotation of the ring gear 51 of the differential device 5 and the oil O is received 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 level S of the oil sump P is high, such as immediately after the motor 2 is driven, the first reservoir 93 is scraped up 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 91b guides the oil O from the first reservoir 93 to the hollow portion 22 of the shaft 21. The in-shaft path 91c is a path through which the oil O passes through the hollow portion 22 of the shaft 21. The rotor inner path 91d is a path that passes through the inside of the rotor main body 24 from the communication hole 23 of the shaft 21 and scatters to the stator 30.

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

The oil O that has reached the stator 30 takes heat from the stator 30. The oil O that has cooled the stator 30 is dropped on the lower side and accumulated in the lower region in the motor accommodating portion 61. The oil O accumulated in the lower region in the motor accommodating portion 61 moves to the gear accommodating portion 62 through the partition wall opening 68 provided in the partition wall 63. As described above, the first oil passage 91 supplies the oil O to the rotor 20 and the stator 30.

In the second oil passage 92, the oil O is pulled up from the oil sump P 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 flow path 92a, a second flow path 92b, a third flow path 92c, and a fourth flow path 94. In the present embodiment, the fourth flow path 94 corresponds to a refrigerant flow path through which oil O as a refrigerant flows. That is, the drive device 1 of the present embodiment includes a fourth flow path 94 as a refrigerant flow path.

The first flow path 92a, the second flow path 92b, and the third flow path 92c are provided on the wall portion of the housing 6. The first flow path 92a connects the oil sump P and the oil pump 96. The second flow path 92b connects the oil pump 96 and the cooler 97. The third flow path 92c connects the cooler 97 and the fourth flow path 94. As shown in FIG. 1, the third flow path 92c is provided, for example, on the wall portion on the front side (+ X side) of the wall portion of the motor accommodating portion 61. More specifically, the third flow path 92c is provided on the front wall portion of the first portion 61a. A part of the front wall portion of the first portion 61a provided with the third flow path 92c protrudes to the front side and extends obliquely with respect to the axial direction. A part of the wall portion on the front side of the first portion 61a where the third flow path 92c is provided is located on the upper side from the right side (−Y side) to the left side (+ Y side), for example.

As shown in FIG. 2, the fourth flow path 94 is provided in the partition wall 63. That is, in the present embodiment, the partition wall 63 corresponds to a wall portion provided with a refrigerant flow path. The fourth flow path 94 connects the first pipe 11 and the second pipe 12 of the pipe 10, which will be described later. As shown in FIG. 5, the fourth flow path 94 has an inflow flow path portion 94a, a branch section 94b, a first branch flow path portion 94c, and a second branch flow path portion 94f. In the present embodiment, the inflow flow path portion 94a is a refrigerant introduction portion that allows oil O as a refrigerant to flow into the branch portion 94b. The first branch flow path portion 94c and the second branch flow path portion 94f are refrigerant discharge portions that allow oil O as a refrigerant to flow out from the branch portion 94b. Therefore, by inflowing the oil O into the inflow flow path portion 94a, the oil O can be sent to the two branch flow path portions via the branch portion 94b. In the present embodiment, the inflow flow path portion 94a corresponds to the first flow path portion. The first branch flow path portion 94c corresponds to the second flow path portion. The second branch flow path portion 94f corresponds to the third flow path portion.

The inflow flow path portion 94a is a portion of the fourth flow path 94 in which the oil O flows in from the third flow path 92c. The inflow flow path portion 94a extends from the third flow path 92c to the rear side (−X side). The inflow flow path 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 flow path portion 94a is large at the front end portion. In the present embodiment, the front end of the inflow flow path portion 94a is the radial outer end of the inflow flow path portion 94a.

The front end (+ X side) end of the inflow flow path portion 94a is located radially outside the fixing portion 32b. The rear end (-X side) of the inflow flow path portion 94a is located radially inside the fixing portion 32b. That is, in the present embodiment, the inflow flow path portion 94a extends in the front-rear direction from the radially outer side of the fixed portion 32b to the radial inner side of the fixed portion 32b. The inflow flow path portion 94a is located above the fixed portion 32b on the front side (+ X side). The inflow flow path portion 94a is made by drilling a hole from the front side (+ X side) of the housing 6, for example. The front end of the inflow flow path portion 94a is closed by tightening the bolt 95a. The bolt 95a is, for example, a bolt similar to the plug member 64 described later.

The branch portion 94b is connected to the inflow flow path portion 94a. In the present embodiment, the branch portion 94b is connected to the rear end (−X side) of the inflow flow path portion 94a. The flow path diameter of the branch portion 94b is larger than the flow path diameter of the inflow flow path portion 94a, the flow path diameter of the first branch flow path portion 94c, and the flow path diameter of the second branch flow path portion 94f. The branch portion 94b is located radially inside the fixed portion 32b. As shown in FIGS. 6 to 8, the branch portion 94b is composed of a hole portion 63b provided in the partition wall 63. In the present embodiment, the hole portion 63b is provided in the protruding portion 63a protruding to the left side (+ Y side) of the partition wall 63. The protruding portion 63a is connected to the inner peripheral surface of the second portion 62a.

The hole 63b is recessed from the left side (+ Y side) to the right side (−Y side) in the axial direction. More specifically, the hole 63b is recessed from the left end face of the protrusion 63a to the right. Here, in the present embodiment, the axial direction corresponds to the thickness direction of the partition wall 63, the left side corresponds to one side in the thickness direction, and the right side corresponds to the other side in the thickness direction. That is, the partition wall 63 has a hole portion 63b that is recessed from one side to the other side in the thickness direction of the partition wall 63. In the present embodiment, the hole portion 63b is recessed from the gear accommodating portion 62 side toward the motor accommodating portion 61 side. The hole 63b is a hole having a bottom on the right side. The hole portion 63b is, for example, a circular hole when viewed in the axial direction.

Since it is composed of such a hole portion 63b, the branch portion 94b has an opening portion 94g that opens on the left side. The opening 94g is the left end of the hole 63b. The opening 94g opens toward the gear accommodating portion 62 side. The opening diameter of the opening 94g is larger than the inner diameter of the inflow flow path portion 94a, the inner diameter of the first branch flow path portion 94c, and the inner diameter of the second branch flow path portion 94f.

As shown in FIG. 7, a female screw portion 63c is provided on the inner peripheral surface of the hole portion 63b. That is, a female screw portion 63c is provided on the inner peripheral surface of the branch portion 94b. More specifically, the female screw portion 63c is provided on the inner peripheral surface of the left side portion of the hole portion 63b. The hole portion 63b is made by drilling a hole from the left side (+ Y side) of the partition wall 63, for example.

The left end of the hole 63b, that is, the opening 94g, is closed by the plug member 64. As a result, it is possible to prevent the oil O flowing into the branch portion 94b from leaking to the outside of the partition wall 63. In the present embodiment, the plug member 64 is a bolt that is fastened to the female screw portion 63c. Therefore, by tightening the plug member 64, the left end portion of the hole portion 63b, that is, the opening portion 94g can be easily closed.

The plug member 64 has a bolt main body portion 64a and a bolt head portion 64b. A male screw portion 64c that meshes with the female screw portion 63c is provided on the outer peripheral surface of the bolt body portion 64a. The bolt head 64b projects outward from the left end of the bolt body 64a in the radial direction of the plug member 64. The right surface of the bolt head 64b comes into contact with the peripheral edge of the hole 63b in the left surface of the partition wall 63. In the present embodiment, of the left side surface of the partition wall 63, the peripheral edge portion of the hole portion 63b is a part of the left side surface of the protruding portion 63a.

A sealing portion 65 is provided on the right surface of the bolt head 64b. The sealing portion 65 is fitted into, for example, a groove portion 64d provided on the right side surface of the bolt head 64b. The sealing portion 65 is an annular shape surrounding the bolt main body portion 64a. The sealing portion 65 is made of rubber, for example. The sealing portion 65 comes into contact with the peripheral edge portion of the hole portion 63b on the left side surface of the partition wall 63. As a result, the sealing portion 65 seals between the peripheral edge portion of the hole portion 63b and the bolt head 64b of the partition wall 63. That is, the sealing portion 65 seals between the peripheral edge of the opening of the branch portion 94b and the bolt head 64b. Therefore, it is possible to further prevent the oil O flowing into the branch portion 94b from leaking to the outside of the partition wall 63.

As shown in FIG. 5, the first branch flow path portion 94c is a portion that branches and extends from the branch portion 94b with respect to the inflow flow path portion 94a. In the present embodiment, the first branch flow path portion 94c extends from the branch portion 94b to the first pipe 11 described later. The first branch flow path portion 94c extends diagonally upward and rearward from the branch portion 94b. The first branch flow path portion 94c extends to the upper end portion of the partition wall 63 through a portion of the partition wall 63 that is lower than the upper fixing portion 32b and is located on the upper side of the shaft 21. The radial position at the upper end of the first branch flow path portion 94c is substantially the same as the radial position of the fixed portion 32b. The upper end of the first branch flow path portion 94c is located on the rear side (−X side) of the upper fixing portion 32b. The upper end of the first branch flow path portion 94c is located above the upper end of the branch portion 94b and the second branch flow path portion 94f.

The first branch flow path portion 94c has an extension portion 94d extending linearly upward and diagonally rearward from the branch portion 94b, and a connecting portion 94e connected to the upper end portion of the extension portion 94d. The connecting portion 94e is an upper end portion of the first branch flow path portion 94c, and is a portion to which the first pipe 11 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, for example, by drilling a hole from the upper side of the housing 6. The upper end of the connecting portion 94e is closed by tightening the bolt 95b. The bolt 95b is, for example, a bolt similar to the plug member 64 described above. The stretched portion 94d is formed, for example, by drilling a hole diagonally forward from the upper side of the housing 6 through the inside of the connecting portion 94e.

The second branch flow path portion 94f is a portion that branches and extends from the branch portion 94b with respect to the inflow flow path portion 94a. In the present embodiment, the second branch flow path portion 94f extends from the branch portion 94b to the second pipe 12 described later. In the present embodiment, the second branch flow path portion 94f extends obliquely upward on the front side from the branch portion 94b. That is, when viewed in the thickness direction of the partition wall 63, the first branch flow path portion 94c and the second branch flow path portion 94f extend in opposite directions in the direction in which the inflow flow path portion 94a extends.

More specifically, when viewed in the thickness direction of the partition wall 63, the first branch flow path portion 94c is on the side opposite to the side where the inflow flow path portion 94a is located (-X) with reference to the virtual line IL shown in FIG. Located in the area (on the side). When viewed in the thickness direction of the partition wall 63, the second branch flow path portion 94f is located in the region on the side (+ X side) where the inflow flow path portion 94a is located, with reference to the virtual line IL. The virtual line IL is a line that extends in the vertical direction orthogonal to the front-rear direction in which the inflow flow path portion 94a extends and passes through the center in the front-rear direction of the branch portion 94b when viewed in the thickness direction of the partition wall 63. In this embodiment, the front-rear direction corresponds to the stretching direction in which the first flow path portion extends.

Further, the first branch flow path portion 94c and the second branch flow path portion 94f extend obliquely in a direction away from each other in the front-rear direction from the branch portion 94b toward the upper side. The second branch flow path portion 94f is inclined to the right side (−Y side) with respect to the front-rear direction and extends linearly. As a result, the second branch flow path portion 94f is located on the right side as the distance from the branch portion 94b increases.

The radial position at the front end (+ X side) of the second branch flow path portion 94f is substantially the same as the radial position of the fixed portion 32b. The front end (+ X side) end of the second branch flow path portion 94f is located above the front fixing portion 32b. The front end of the second branch flow path portion 94f and the front fixing portion 32b are arranged at substantially the same position in the front-rear direction. The second branch flow path portion 94f is formed, for example, by drilling a hole from the left side (+ Y side) of the partition wall 63 through the inside of the branch portion 94b, that is, the inside of the hole portion 63b.

As shown in FIG. 8, when the second branch flow path portion 94f is viewed in the direction extending from the branch portion 94b, the second branch flow path portion 94f is the left end (+ Y side) end of the hole portion 63b, that is, the opening. It overlaps with the portion 94 g. Specifically, when viewed in the direction in which the second branch flow path portion 94f extends from the branch portion 94b, the entire second branch flow path portion 94f overlaps a part of the opening portion 94g. That is, the direction in which the second branch flow path portion 94f extends from the branch portion 94b is a direction in which a drill can be inserted from the opening 94g for processing. Specifically, before the plug member 64 is attached, a drill is inserted straight into the hole 63b through the opening of the hole 63b to drill a hole in the partition wall 63 to form a second branch flow path portion 94f. Can be done. Therefore, the second branch flow path portion 94f can be easily made. Further, in the present embodiment, since the inner diameter of the opening 94g is larger than the inner diameter of the first branch flow path portion 94c and the inner diameter of the second branch flow path portion 94f, a drill is inserted into the hole portion 63b from the opening 94g. It is easy to get in, and the second branch flow path portion 94f can be made more easily.

As shown in FIG. 5, when viewed in the axial direction, which is the thickness direction of the partition wall 63, the first branch flow path portion 94c is the branch portion 94b with respect to the direction in which the inflow flow path portion 94a extends toward the branch portion 94b. The angle θ1 formed by the direction extending from is smaller than the angle θ2 formed by the direction extending from the branch portion 94b by the second branch flow path portion 94f. In the present embodiment, the direction in which the inflow flow path portion 94a extends toward the branch portion 94b is the rear side direction (−X direction) when viewed in the axial direction. In the present embodiment, the direction in which the first branch flow path portion 94c extends from the branch portion 94b is upward diagonally backward when viewed in the axial direction. In the present embodiment, the direction in which the second branch flow path portion 94f extends from the branch portion 94b is upward diagonally forward when viewed in the axial direction.

The angle θ1 is the smaller of the angles formed by the virtual line Li passing through the central axis of the inflow flow path portion 94a and the virtual line Lb1 passing through the central axis of the first branch flow path portion 94c when viewed in the axial direction. is there. The angle θ2 is the larger of the angles formed by the virtual line Li passing through the central axis of the inflow flow path portion 94a and the virtual line Lb2 passing through the central axis of the second branch flow path portion 94f when viewed in the axial direction. is there. In the present embodiment, the virtual line Li passes through the motor shaft J1 when viewed in the axial direction. In this embodiment, the angle θ1 is an acute angle. The angle θ2 is an obtuse angle. The angle θ1 is, for example, about 45 ° or more and 80 ° or less. The angle θ2 is, for example, about 100 ° or more and 170 ° or less.

In the present embodiment, when viewed in the thickness direction of the partition wall 63, the direction in which the inflow flow path portion 94a extends from the branch portion 94b (+ X direction) and the direction in which the first branch flow path portion 94c extends from the branch portion 94b. The angle θ3 formed is larger than the angle θ4 formed between the direction in which the inflow flow path portion 94a extends from the branch portion 94b and the direction in which the second branch flow path portion 94f extends from the branch portion 94b. The angle θ3 is the smaller of the angles formed by the inflow flow path portion 94a and the first branch flow path portion 94c when viewed in the axial direction. The angle θ4 is the smaller of the angles formed by the inflow flow path portion 94a and the second branch flow path portion 94f when viewed in the axial direction. In this embodiment, the angle θ3 is an obtuse angle. In this embodiment, the angle θ4 is an acute angle. The angle θ3 is, for example, about 90 ° or more and 150 ° or less. The angle θ4 is, for example, about 10 ° or more and 30 ° or less.

In the fourth flow path 94, the rear side portion of the inflow flow path portion 94a, the branch portion 94b, the portion of the extension portion 94d excluding the upper end portion, and the rear portion of the second branch flow path portion 94f are partition walls. It is provided in a portion of 63 located radially inside the fixed portion 32b. That is, in the present embodiment, the fourth flow path 94 has a portion that passes radially inside the fixed portion 32b.

As shown in FIG. 2, the pipe 10 extends in the axial direction. The left end of the pipe 10 is fixed to the bulkhead 63. As shown in FIG. 3, the pipe 10 includes a first pipe 11 and a second pipe 12. That is, the drive device 1 includes a first pipe 11 and a second pipe 12. In the present embodiment, the first pipe 11 and the second pipe 12 have a cylindrical shape extending linearly in the axial direction. The first pipe 11 and the second pipe 12 are parallel to each other. As shown in FIG. 4, 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 located on the radial outer side of the stator 30. The first pipe 11 and the second pipe 12 are arranged so as to be spaced apart from each other in the circumferential direction. The radial position of the first pipe 11 and the radial position of the second pipe 12 are, for example, the same.

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

In the present embodiment, the first pipe 11 is located above the stator 30. In the present 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 located on the rear side (−X side) of the upper fixing portion 32b. As shown in FIG. 9, the first pipe 11 includes a first pipe main body 11a, a small diameter portion 11b provided at the left (+ Y side) end of the first pipe main body 11a, and a first pipe main body. It has a small diameter portion 11c provided at the right end (−Y side) end of 11a.

The small diameter portion 11b is an end portion on the left side (+ Y side) of the first pipe 11. The small diameter portion 11c is an end portion on the right side (−Y side) 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 main body portion 11a. The small diameter portion 11b of the first pipe 11 is inserted into the partition wall 63 from the right side and fixed to the partition wall 63. The small diameter portion 11b opens to the left. As shown in FIG. 5, the small diameter portion 11b opens into the connecting portion 94e of the first branch flow path portion 94c. As a result, the first pipe 11 is connected to the fourth flow path 94.

As shown in FIG. 9, a mounting member 16 is provided at the right end (−Y side) of the first pipe 11. The mounting member 16 has a rectangular plate shape whose plate surface faces in the axial direction. The mounting member 16 has a recess 16a recessed from the left side (+ Y side) surface to the right side. The right end of the first pipe 11, that is, the small diameter portion 11c is fitted and fixed to 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 16b that penetrates the mounting member 16 in the axial direction. As shown in FIG. 3, the bolt 18 is passed through the hole 16b from the right side (−Y side). The bolt 18 penetrates the hole 16b and is fastened to the protrusion 61d shown in FIG. 4 from the right side. The protruding portion 61d protrudes inward in the radial direction on the inner peripheral surface of the motor accommodating portion 61. By tightening the bolt 18 to the protrusion 61d, the mounting member 16 is fixed to the protrusion 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. 9, the first pipe 11 has a plurality of first oil supply ports 13 and a plurality of second oil supply ports 14. In the present embodiment, the first oil supply port 13 and the second oil supply port 14 correspond to the refrigerant supply port for supplying the refrigerant to the stator 30. The oil O that has flowed into the first pipe 11 is discharged from the first oil supply port 13 and the second oil supply port 14. The first oil supply port 13 and the second oil supply port 14 are provided on the outer peripheral surface of the first pipe 11. The first oil supply port 13 and the second oil supply port 14 are holes that penetrate the first pipe 11 from the inner peripheral surface to the outer peripheral surface. The first oil supply port 13 and the second oil supply port 14 have, for example, a circular shape. As shown in FIGS. 3 and 9, the first oil supply port 13 and the second oil supply port 14 face downward.

In the present embodiment, a plurality of first oil supply ports 13 are provided at both ends of the first pipe main body 11a in the axial direction. For example, four first oil supply ports 13 are provided at both ends of the first pipe main body 11a in the axial direction. The four first oil supply ports 13 provided at the right (−Y side) end of the first pipe main body 11a are arranged in a zigzag manner along the circumferential direction. The four first oil supply ports 13 provided at the right end of the first pipe main body 11a are one first oil supply port 13 that opens directly below and two first oil supply ports that open diagonally forward on the lower side. It includes an oil supply port 13 and one first oil supply port 13 that opens obliquely rearward on the lower side. The four first oil supply ports 13 provided at the left (+ Y side) end of the first pipe main body 11a are provided on the right side of the first pipe main body 11a except for the axial position. It is arranged in the same manner as the four first oil supply ports 13.

As shown in FIG. 3, four first oil supply ports 13 provided on the right side (−Y side) of the plurality of first oil supply ports 13 are located above the coil end 33a. The four first oil supply ports 13 provided on the left side (+ Y side) of the plurality of first oil supply ports 13 are located above the coil ends 33b. Therefore, the oil O discharged from the first oil supply port 13 is supplied to the coil ends 33a and 33b from above. That is, in the present embodiment, the first oil supply port 13 is a supply port for supplying oil O to the coil ends 33a and 33b.

The second oil supply port 14 is provided at the central portion of the first pipe 11 in the axial direction. In the present embodiment, two second oil supply ports 14 are provided at the central portion of the first pipe main body 11a in the axial direction at intervals in the axial direction. As shown in FIG. 4, in the present embodiment, the second oil supply port 14 opens diagonally forward on the lower side. As shown in FIGS. 3 and 4, the second oil supply port 14 is located above the stator core 32. Therefore, the oil O discharged from the second oil supply port 14 is supplied to the stator core 32 from above. That is, in the present embodiment, the second oil supply port 14 is a supply port for supplying oil O to the stator core 32.

In the present specification, "the refrigerant supply port faces downward in the vertical direction" means that the direction of the refrigerant supply port may include a downward component, and the refrigerant supply port may face directly downward. , The refrigerant supply port may be oriented so as to be tilted with respect to the bottom. As described above, in the present embodiment, the first oil supply port 13 as the refrigerant supply port is the first oil supply port 13 facing directly below and the first oil supply port facing diagonally forward with respect to the lower side. Includes a port 13 and a first oil supply port 13 that faces diagonally rearward with respect to the bottom. Further, in the present embodiment, the second oil supply port 14 as the refrigerant supply port faces a direction obliquely inclined forward with respect to directly below. In the present embodiment, "the second oil supply port 14 faces downward" means that the second oil supply port 14 may face directly downward, for example, or is inclined rearward with respect to the direct downward direction. You may be facing.

The second pipe 12 is located on the front side (+ X side) of the stator 30. In the present 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 located above the front fixing portion 32b. A fixing portion 32b located on the upper side is located 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 so as to sandwich the fixing portion 32b in the circumferential direction.

As shown in FIG. 3, the second pipe 12 has a second pipe main body 12a and a small diameter portion 12b provided at the left (+ Y side) end of the second pipe main body 12a. Although not shown, the second pipe 12 has a small diameter portion provided at the right (−Y side) end of the second pipe main body 12a, similarly to the first pipe 11.

The small diameter portion 12b is an end portion on the left side (+ Y side) of the second pipe 12. The outer diameter of the small diameter portion 12b is smaller than the outer diameter of the second pipe main body portion 12a. In the second pipe 12, the small diameter portion 12b is inserted into the partition wall 63 from the right side (−Y side) and fixed to the partition wall 63. The small diameter portion 12b opens to the left. As shown in FIG. 5, the small diameter portion 12b opens at the front end (+ X side) of the second branch flow path portion 94f. As a result, 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 flow path portion 94c, the branch section 94b, and the second branch flow path portion 94f.

As shown in FIG. 3, a mounting member 17 is provided at the right end (−Y side) of the second pipe 12. The mounting member 17 has a rectangular plate shape whose plate surface faces in 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 bolted to the protruding portion 61e shown in FIG. 4 in the same manner as the mounting member 16. 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 61e protrudes inward in the radial direction on the inner peripheral surface of the motor accommodating portion 61.

As shown in FIG. 3, the second pipe 12 has a plurality of third oil supply ports 15. In the present embodiment, the third oil supply port 15 corresponds to a refrigerant supply port that supplies the refrigerant to the stator 30. The oil O that has flowed into the second pipe 12 is discharged from the third oil supply port 15. The third oil supply port 15 is provided on the outer peripheral surface of the second pipe 12. More specifically, the third oil supply port 15 is provided on the outer peripheral surface of the second pipe main body 12a. The plurality of third oil supply ports 15 are arranged at intervals along the axial direction. For example, six third oil supply ports 15 are provided. The third oil supply port 15 is a hole that penetrates the second pipe 12 from the inner peripheral surface to the outer peripheral surface. The third oil supply port 15 has, for example, a circular shape.

As shown in FIG. 4, the third oil supply port 15 faces upward. In the present embodiment, the third oil supply port 15 faces diagonally upward and rearward. The third oil supply port 15 is located on the front side (+ X side) of the stator core 32. The oil O discharged from the third oil supply port 15 is injected diagonally rearward on the upper side and supplied to the outer peripheral surface of the stator core main body 32a. That is, in the present embodiment, the third oil supply port 15 is a supply port for supplying oil O to the stator core 32.

In the present specification, "the refrigerant supply port faces upward" means that the direction of the refrigerant supply port may include an upward component, the refrigerant supply port may face directly upward, or the refrigerant. The supply port may be oriented so as to be tilted with respect to directly above. As described above, the third oil supply port 15 of the present embodiment faces in a direction obliquely inclined rearward with respect to directly above. In the present embodiment, "the third oil supply port 15 faces upward" means that the third oil supply port 15 may face directly upward, for example, or is oriented obliquely forward with respect to the direct upward. You may be facing.

The oil pump 96 shown in FIG. 2 is a pump that sends 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 oil O from the oil sump P through the first flow path 92a, and sucks oil O from the second flow path 92b, the cooler 97, the third flow path 92c, the fourth flow path 94, and the pipe. Oil O is supplied to the motor 2 via 10. 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 flow path portion 94a. As shown in FIG. 5, the oil O that has flowed into the inflow flow path portion 94a flows to the rear side (−X side), and passes through the branch portion 94b to the first branch flow path portion 94c and the second branch flow path portion 94c. It branches into each of 94f and flows in. The oil O that has flowed into the first branch flow path portion 94c flows into the first pipe 11 from the left end (+ Y side) of the first pipe 11. The oil O that has flowed into the first pipe 11 flows in the first pipe 11 to the right side (−Y side), and is supplied to the stator 30 from the first oil supply port 13 and the second oil supply port 14. On the other hand, the oil O that has flowed into the second branch flow path portion 94f flows into the second pipe 12 from the left end portion of the second pipe 12. The oil O that has flowed into the second pipe 12 flows to the right in the second pipe 12 and is supplied to the stator 30 from the third oil supply port 15.

In this way, 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 that has flowed into the inflow flow path portion 94a can be branched into the first branch flow path portion 94c and the second branch flow path portion 94f and supplied to the first pipe 11 and the second pipe 12, respectively. Therefore, the amount of oil O supplied to the first pipe 11 and the second pipe 12 are compared with the case where the oil O flows from one pipe 10 of the first pipe 11 and the second pipe 12 to the other pipe 10. It is easy to prevent a bias in the amount of oil O supplied to the pipe. Further, since it is easy to shorten the path until the oil O is supplied to each pipe 10, it is easy to keep the temperature of the oil O supplied to the stator 30 relatively low. Therefore, the stator 30 can be suitably cooled.

The oil O supplied from the first pipe 11 and the second pipe 12 to the stator 30 is dropped downward and accumulated in the lower region in the motor accommodating portion 61. The oil O accumulated in the lower region in the motor accommodating portion 61 moves to the oil sump P of the gear accommodating portion 62 via the partition wall opening 68 provided in the partition wall 63. As described above, the second oil passage 92 supplies the oil O to the stator 30.

The cooler 97 shown in FIG. 2 cools the oil O passing through the second oil passage 92. A second flow path 92b and a third flow path 92c are connected to the cooler 97. The second flow path 92b and the third flow path 92c are connected via the internal flow path of the cooler 97. A cooling water pipe 98 for passing cooling water cooled by a radiator (not shown) is connected to the cooler 97. The oil O passing through the inside of the cooler 97 is cooled by exchanging heat with the cooling water passing through the cooling water pipe 98.

According to the present embodiment, the first branch flow path portion 94c and the second branch flow path portion 94c in which the fourth flow path 94 through which the oil O as a refrigerant flows branches from the inflow flow path portion 94a via the branch portion 94b. It has 94f. The branch portion 94b has an opening 94g that opens on one side in the thickness direction of the partition wall 63, and the opening 94g is closed by the plug member 64. As described above, since the branch portion 94b has an opening portion 94g, a hole portion 63b that is recessed in the thickness direction with respect to the partition wall 63 provided with the fourth flow path 94 is formed, and the hole portion 63b is formed. The branch portion 94b can be easily provided on the partition wall 63 by closing one end of the partition wall, that is, the opening 94g. Therefore, the first branch flow path portion 94c and the second branch flow path portion 94f can be easily provided as the flow path portions that branch into the partition wall 63.

Specifically, in the present embodiment, by providing the hole portion 63b, the partition wall 63 can be drilled through the inside of the hole portion 63b, and the second branch flow path portion 94f can be easily formed. As a result, a plurality of branched flow paths can be easily provided in the housing 6 without crawling pipes or the like on the outside of the housing 6. Therefore, according to the present embodiment, it is possible to prevent the drive device 1 from becoming large.

Further, according to the present embodiment, the fourth flow path 94 is provided in the partition wall 63 located on the left side of the stator 30. Therefore, the fourth flow path 94 can be arranged at a position where it overlaps with the stator 30 in the axial direction. As a result, it is easy to arrange the fourth flow path 94 while avoiding interference with the fixing portion 32b of the stator 30. Further, for example, as compared with the case where the fourth flow path 94 is provided on the outer side in the radial direction of the stator 30, it is possible to prevent the housing 6 from becoming larger in the radial direction. Therefore, it is possible to further suppress the increase in size of the drive device 1.

Further, according to the present embodiment, the opening 94g opens toward the gear accommodating portion 62 side. The gear accommodating portion 62 tends to have a smaller axial dimension than the motor accommodating portion 61. Therefore, the axial distance from the opening on the gear accommodating portion 62 side in the housing body 6a to the partition wall 63 is smaller than the axial distance from the opening on the motor accommodating portion 61 side in the housing body 6a to the partition wall 63. Cheap. As a result, when the hole portion 63b is formed by drilling, the distance from the opening on the gear accommodating portion 62 side to the partition wall 63 is shorter, and the partition wall 63 can be easily drilled. Therefore, the hole portion 63b can be easily formed, and the branch portion 94b can be more easily provided on the partition wall 63. Further, by opening the opening 94g to the gear accommodating portion 62 side, it is possible to form a second branch flow path portion 94f from the branch portion 94b toward the motor accommodating portion 61 side by drilling a hole through the opening 94g. As a result, the oil O can be easily supplied to the stator 30 in the motor accommodating portion 61 via the second branch flow path portion 94f.

Further, according to the present embodiment, the first branch flow path portion 94c extends from the branch portion 94b to the first pipe 11, and the second branch flow path portion 94f extends from the branch portion 94b to the second pipe 12. Therefore, oil O can be sent from each of the first branch flow path portion 94c and the second branch flow path portion 94f to each of the first pipe 11 and the second pipe 12. As a result, the oil O can be supplied to the stator 30 from the oil supply ports provided in the first pipe 11 and the second pipe 12, respectively, and the stator 30 can be cooled.

Further, the first pipe 11 and the second pipe 12 are connected by a fourth flow path 94 as a refrigerant flow path. Therefore, for example, by sending the oil O to the inflow flow path portion 94a of the fourth flow path 94 as in the present embodiment, the oil O can be supplied to both the first pipe 11 and the second pipe 12. it can. That is, the number of oil passages provided in the housing 6 can be reduced as compared with the case where separate oil passages for supplying oil O are provided for each of the first pipe 11 and the second pipe 12. Therefore, it is possible to prevent the housing 6 from becoming large. As a result, it is possible to further suppress the increase in size of the drive device 1.

Further, since the fourth flow path 94 is provided in the partition wall 63 of the housing 6, the drive device is compared with the case where the flow path connecting the first pipe 11 and the second pipe 12 is provided on the outside of the housing 6 by a pipe or the like. 1 It is easy to miniaturize the whole. Therefore, according to the present embodiment, it is possible to further suppress the increase in size of the drive device 1.

Further, for example, the ease of feeding the oil O into each branch flow path portion may differ depending on the arrangement relationship such as the position where each branch flow path portion sends the oil O. In this case, the amount of oil O sent from each branch flow path to each pipe may be uneven, resulting in a problem in cooling the stator 30.

On the other hand, according to the present embodiment, when viewed in the thickness direction of the partition wall 63, the direction in which the inflow flow path portion 94a extends from the branch portion 94b and the direction in which the first branch flow path portion 94c extends from the branch portion 94b. The angle θ3 formed by the two is larger than the angle θ4 formed by the direction in which the inflow flow path portion 94a extends from the branch portion 94b and the direction in which the second branch flow path portion 94f extends from the branch portion 94b. Therefore, when the oil O flows from the inflow flow path portion 94a to the first branch flow path portion 94c, the change in the direction in which the oil O flows flows from the inflow flow path portion 94a to the second branch flow path portion 94f. It is smaller than the change in the direction in which the oil O flows. As a result, the oil O can be more easily flowed from the branch portion 94b to the first branch flow path portion 94c as compared with the second branch flow path portion 94f. Therefore, for example, when the arrangement relationship is such that the oil O is less likely to be sent to the first branch flow path portion 94c than the second branch flow path portion 94f, the oil O is less likely to be sent into the first branch flow path portion 94c. Can be suppressed, and oil O can be easily sent to both the first branch flow path portion 94c and the second branch flow path portion 94f to the same extent. As a result, the oil O can be easily sent to both the first pipe 11 and the second pipe 12 via each branch flow path portion. Therefore, it is possible to prevent a problem in cooling the stator 30.

The arrangement relationship in which oil O is less likely to be sent to the first branch flow path portion 94c than that of the second branch flow path portion 94f is that, for example, as in the present embodiment, the upper end portion of the first branch flow path portion 94c is , The arrangement relationship is located above the upper end of the branch portion 94b and the second branch flow path portion 94f. In this case, since it is necessary to send the oil O above the second branch flow path portion 94f, it may be difficult for the oil O to be sent into the first branch flow path portion 94c. On the other hand, according to the present embodiment, it is possible to prevent the oil O from being difficult to be sent to the first branch flow path portion 94c described above, so that the first branch flow path portion 94c and the second branch flow path portion 94f Oil O can be easily sent to both of them. That is, the effect of suppressing the difficulty of oil O being sent to the first branch flow path portion 94c is that the upper end of the first branch flow path portion 94c is the branch portion 94b and the second branch flow path portion 94f. It is particularly useful in configurations that are located above the upper end.

Further, according to the present embodiment, when viewed in the thickness direction of the partition wall 63, the second branch flow path portion 94f is a region on the side (+ X side) where the inflow flow path portion 94a is located with reference to the virtual line IL. The first branch flow path portion 94c is located in a region opposite to the side where the inflow flow path portion 94a is located. Therefore, the direction of the oil O flowing in the one branch flow path portion in the front-rear direction is the same as the direction of the oil O flowing in the inflow flow path portion 94a in the front-rear direction, and the direction of the oil O flowing in the other branch flow path portion is the same. The direction in the front-rear direction is opposite to the direction in the front-rear direction of the oil O flowing in the inflow flow path portion 94a. As a result, the oil O can be easily flowed from the inflow flow path portion 94a into one branch flow path portion, while the oil O can be difficult to flow from the inflow flow path portion 94a into the other branch flow path portion. Therefore, for example, by determining the direction of the flow of the oil O in each branch flow path in the front-rear direction according to the difficulty of feeding the oil O from each branch flow path to each pipe, the inside of each branch flow path is determined. And the oil O can be easily sent into each pipe to the same extent.

Specifically, in the present embodiment, the first pipe 11 is located above the second pipe 12 and has a large distance from the branch portion 94b. Therefore, it is difficult to send the oil O from the first branch flow path portion 94c to the first pipe 11 as compared with the case where the oil O is sent from the second branch flow path portion 94f to the second pipe 12. On the other hand, the direction of the oil O flowing in the first branch flow path portion 94c in the front-rear direction is the same as the direction of the oil O flowing in the inflow flow path portion 94a in the front-rear direction. Further, the direction of the oil O flowing in the second branch flow path portion 94f in the front-rear direction is opposite to the direction of the oil O flowing in the inflow flow path portion 94a in the front-rear direction. Therefore, the oil O from the inflow flow path portion 94a can be relatively easily sent into the first branch flow path portion 94c. As a result, the oil O can be easily sent to both the first pipe 11 and the second pipe 12 via each branch flow path portion.

Further, according to the present embodiment, the fourth flow path 94 has a portion that passes radially inside the fixing portion 32b. Therefore, it is easier to arrange the fourth flow path 94 so as to avoid the fixed portion 32b, and it is possible to further suppress the housing 6 from becoming larger in the radial direction. Therefore, it is possible to further suppress the increase in size of the drive device 1.

Further, according to the present embodiment, the first pipe 11 and the second pipe 12 are arranged so as to sandwich the fixing portion 32b in the circumferential direction. Therefore, the first pipe 11 and the second pipe 12 can be arranged at positions that do not interfere with the fixing portion 32b, and the first pipe 11 and the second pipe 12 can be arranged so as to be close to the stator core main body 32a in the radial direction. Therefore, it is possible to easily supply the oil O from the first pipe 11 and the second pipe 12 to the stator 30, and it is possible to prevent the drive device 1 from becoming larger in the radial direction.

Further, according to the present embodiment, the first pipe 11 and the second pipe 12 extend linearly in the axial direction. Therefore, it is possible to prevent the drive device 1 from becoming larger in the radial direction as compared with the case where the first pipe 11 and the second pipe 12 are bent and extended in the radial direction. Further, since the shape of the first pipe 11 and the shape of the second pipe 12 can be made simple, it is easy to make the first pipe 11 and the second pipe 12. Further, the first pipe 11 and the second pipe 12 can be easily arranged so as to face the stator 30 over a wide range in the axial direction. Therefore, it is easy to supply the oil O from the first pipe 11 and the second pipe 12 to a wide range in the axial direction of the stator 30. Therefore, the stator 30 can be cooled more preferably.

Further, according to the present embodiment, the motor shaft J1 extends in the horizontal direction orthogonal 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 flowed from the upper side to the lower side of the stator 30 by using gravity. As a result, the oil O can be easily supplied to the entire stator 30, and the entire stator 30 can be easily cooled by the oil O.

Specifically, in the present embodiment, the first pipe 11 is located on the upper side of the stator 30, and the first oil supply port 13 and the second oil supply port 14 of the first pipe 11 face downward. Therefore, the oil O can be discharged downward from the first pipe 11 toward the stator 30. 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 by using gravity, and the entire stator 30 can be easily cooled.

Further, in the present embodiment, the second pipe 12 is located on the front side of the stator 30, and the third oil supply port 15 of the second pipe 12 faces upward. Therefore, the oil O discharged upward from the third oil supply port 15 can be supplied to the upper portion of the stator 30. As a result, the oil O from the second pipe 12 can flow from the upper side to the lower side of the stator 30 by using gravity, and the entire stator 30 can be easily cooled. In particular, in the present embodiment, the third oil supply port 15 faces diagonally upward and rearward. Therefore, the oil O discharged from the third oil supply port 15 can easily reach the upper portion of the stator 30. As a result, the stator 30 can be more easily cooled by the oil O discharged from the second pipe 12.

Further, according to the present embodiment, the second oil supply port 14 of the first pipe 11 and the third oil supply port 15 of the second pipe 12 are supply ports for supplying 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, as shown in FIG. 4, in the present embodiment, the first pipe 11 is located behind the upper fixing portion 32b. Therefore, the oil O discharged from the second oil supply port 14 of the first pipe 11 tends to flow to the rear side of the upper fixed portion 32b. As a result, the oil O can be easily supplied to the rear portion of the stator core 32 by the first pipe 11. On the other hand, the second pipe 12 is located on the front side of the upper fixed portion 32b. Therefore, the oil O discharged upward from the third oil supply port 15 of the second pipe 12 is likely to be supplied to a portion on the front side of the upper fixed portion 32b. As a result, the oil O can be easily supplied to the front portion of the stator core 32 by the second pipe 12. Therefore, the first pipe 11 and the second pipe 12 make it easy to supply oil O to both sides of the stator core 32 in the front-rear direction, and it is easy to cool the entire stator core 32.

Further, according to the present embodiment, the first oil supply port 13 of the first pipe 11 is a supply port for supplying 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. In the present embodiment, since the first pipe 11 is located on the upper side of the stator 30, the oil O from the first oil supply port 13 can be supplied from the upper side of the coil ends 33a and 33b. As a result, the oil O from the first oil supply port 13 can flow from the upper side to the lower side of the coil ends 33a and 33b by using gravity. Therefore, it is easy to supply the oil O to the entire coil ends 33a and 33b, and it is easy to cool the entire coil ends 33a and 33b.

Further, according to the present embodiment, a plurality of first oil supply ports 13 of the first pipe 11 are arranged above 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 suitably cooled, and the stator 30 can be cooled more preferably.

Further, according to the present embodiment, the plurality of first oil supply ports 13 located above the coil ends 33a and 33b are arranged in a zigzag manner along the circumferential direction. Therefore, the axial positions of the plurality of first oil supply ports 13 arranged along the circumferential direction are alternately arranged. As a result, it is easier to supply oil O to the entire coil ends 33a and 33b than when the axial positions of the plurality of first oil supply ports 13 located above the coil ends 33a and 33b are the same. ..

Further, according to the present embodiment, the first oil supply port 13 located above the coil ends 33a and 33b has a first oil supply port 13 facing diagonally forward on the lower side and a first oil supply port 13 facing diagonally backward on the lower side. The oil supply port 13 and the like are included. Therefore, it is easy to supply the oil O supplied from the plurality of first oil supply ports 13 to both the front side portion and the rear side portion of the coil ends 33a and 33b, and it is easy to supply the oil O 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 right end portion of the first pipe 11 is closed by the mounting member 16, and the right end portion of the second pipe 12 is closed by the mounting member 17. In the present embodiment, the right end of the first pipe 11 is the end opposite to the side on which the oil O flows into the first pipe 11. The right end of the second pipe 12 is the end opposite to the side on which the oil O flows into the second pipe 12. That is, of the axial end portions of each pipe, the end portion opposite to the side on which the oil O flows in is closed. Therefore, the pressure of the oil O flowing in each pipe is likely to be increased as compared with the case where the end portion of each pipe in the axial direction opposite to the side on which the oil O flows is opened. As a result, it is easy to vigorously inject oil O 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.

In particular, in the second pipe 12 of the present embodiment, the third oil supply port 15 faces upward. Therefore, the oil O can be vigorously injected upward from the third oil supply port 15. As a result, the oil O discharged from the third oil supply port 15 can easily reach the portion of the stator core 32 located on the upper side. Therefore, the oil O discharged from the second pipe 12 can be easily supplied over a wide range of the stator core 32, and the stator core 32 can be cooled more preferably.

The present invention is not limited to the above-described embodiment, and other configurations may 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 to this. The refrigerant is not particularly limited as long as it can be supplied to the stator to cool the stator. The refrigerant may be, for example, an insulating liquid or water. When the refrigerant is water, the surface of the stator may be insulated.

The refrigerant flow path may have any shape as long as it has a first flow path portion, a second flow path portion, a third flow path portion, and a branch portion and is provided on the wall portion of the housing. The direction in which the first flow path portion extends, the direction in which the second flow path portion extends, and the direction in which the third flow path portion extends are not particularly limited. The second flow path portion does not have to be connected to the first pipe. The third flow path portion does not have to be connected to the second pipe. The refrigerant flow path may have a first flow path portion, a second flow path portion, and a fourth flow path portion different from the third flow path portion. The fourth flow path portion may be a flow path portion that branches from the branch portion, or branches from any one of the first flow path portion, the second flow path portion, and the third flow path portion. It may be a flow path portion.

The wall portion of the housing provided with the refrigerant flow path is not particularly limited. The refrigerant flow path may be provided on the outer wall portion of the housing. For example, in the above-described embodiment, the first lid member 61b may be provided with a refrigerant flow path. The hole portion forming the branch portion may be a through hole penetrating the wall portion of the housing. In this case, the other end of the hole in the thickness direction is also closed by the plug member.

The flow of the refrigerant in the refrigerant flow path is not particularly limited. For example, even if the refrigerant flows into any two of the first flow path, the second flow path, and the third flow path, and the refrigerant merges in the remaining one flow path. Good. That is, the two flow paths may be the refrigerant introduction section for flowing the refrigerant into the branch section, and the remaining one flow path section may be the refrigerant discharge section for flowing the refrigerant out of the branch section. Further, the refrigerant flows into any of the first flow path portion, the second flow path portion, and the third flow path portion, the refrigerant merges at the branch portion, and the branch portion moves to another flow path. And the refrigerant may flow. That is, the three flow paths may be a refrigerant introduction section for flowing the refrigerant into the branch, and another flow path may be a refrigerant discharge section for flowing the refrigerant from the branch section.

The plug member may be any member as long as it can close one end of the hole in the thickness direction. The plug member may be a member that is press-fitted into the hole to close the opening of the hole. Further, the plug member may be a member that is fixed by welding, adhesion, or the like to close the opening of the hole. The sealing portion may not be provided.

The first pipe and the second pipe may be arranged at any position as long as they are located on the radial outer side of the stator and are arranged at intervals in the circumferential direction. For example, at least one of the first pipe and the second pipe may be located below the stator, or may be located behind the stator. Further, the first pipe and the second pipe may be arranged on the same side with respect to the stator. For example, both the first pipe and the second pipe may be located above the stator.

The shape of the first pipe and the shape of the second pipe are not particularly limited. The first pipe and the second pipe may have a square tubular shape. The first pipe and the second pipe may be bent and extended, or may be curved. At least one refrigerant supply port of the first pipe may be provided. At least one refrigerant supply port of the second pipe may be provided. The refrigerant supply port may be any supply port that supplies the refrigerant to the stator, and may not include the supply port that supplies the refrigerant to the stator core, or may not include the supply port that supplies the refrigerant to the coil end. In the first pipe and the second pipe, the end portion opposite to the side on which the refrigerant flows may be open.

Other pipes other than the first pipe and the second pipe may be provided. In this case, the other pipe may or may not have a refrigerant supply port for supplying the refrigerant to the stator as in the first pipe and the second pipe. Other pipes may have supply ports for supplying oil as a lubricant to bearings such as rotors. The first pipe and the second pipe may not be provided. The pump may be a mechanical pump. The pump may not be provided.

The drive 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 does not have to include 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 drive device corresponds to the motor itself. The direction in which the motor shaft extends is not particularly limited. The motor shaft may extend in the vertical direction. In the present specification, "the motor shaft extends in the horizontal direction orthogonal to the vertical direction" includes not only the case where the motor shaft extends strictly in the horizontal direction but also the case where the motor shaft extends in the substantially horizontal direction. That is, in the present specification, "the motor shaft extends in the horizontal direction orthogonal to the vertical direction" may mean that the motor shaft is slightly tilted with respect to the horizontal direction. Further, in the above-described embodiment, the case where the drive device does not include the inverter unit has been described, but the present invention is not limited to this. The drive device may include an inverter unit. In other words, the drive device may be integrated with the inverter unit.

The use of the drive device is not particularly limited. The drive device does not have to be mounted on the vehicle. The configurations described herein can be combined as appropriate to the extent that they do not contradict each other.

1 ... Drive device, 2 ... Motor, 3 ... Transmission device, 6 ... Housing, 11 ... 1st pipe, 12 ... 2nd pipe, 13 ... 1st oil supply port (refrigerant supply port), 14 ... 2nd oil supply port (Refrigerant supply port), 15 ... 3rd oil supply port (refrigerant supply port), 20 ... rotor, 30 ... stator, 55 ... axle, 61 ... motor housing (first housing), 62 ... gear housing (first) 2 accommodating part), 63 ... partition wall (wall part), 63c ... female screw part, 64 ... plug member, 64b ... bolt head, 65 ... sealing part, 94 ... fourth flow path (refrigerant flow path), 94a ... Inflow flow path portion (first flow path section), 94b ... Branch section, 94c ... First branch flow path section (second flow path section), 94f ... Second branch flow path section (third flow path section), 94g ... Opening, J1 ... Motor shaft, O ... Oil (refrigerant)

Claims (13)

With the motor
A housing that houses the motor inside
With
The housing has a wall portion provided with a refrigerant flow path through which the refrigerant flows.
The refrigerant flow path is
The first flow path and
A branch portion connected to the first flow path portion and
With respect to the first flow path portion, the second flow path portion and the third flow path portion extending from the branch portion are
Have,
The branch portion has an opening that opens on one side in the thickness direction of the wall portion.
A drive device in which the opening is closed by a plug member. The motor
A rotor that can rotate around the motor shaft,
The stator located on the radial outer side of the rotor and
Have,
The driving device according to claim 1, wherein the wall portion is located on one side in the axial direction of the stator. Further equipped with a transmission device connected to the motor,
The housing is
A first housing unit that houses the motor inside,
A second accommodating portion for accommodating the transmission device inside,
Have,
The wall portion is a partition wall that separates the inside of the first accommodating portion and the inside of the second accommodating portion.
The driving device according to claim 2, wherein the opening opens toward the second accommodating portion side. Further, a first pipe and a second pipe located on the radial outer side of the stator and arranged at intervals in the circumferential direction about the motor shaft are further provided.
The first pipe and the second pipe each have a refrigerant supply port for supplying the refrigerant to the stator.
The second flow path portion extends from the branch portion to the first pipe.
The driving device according to claim 2 or 3, wherein the third flow path portion extends from the branch portion to the second pipe. The driving device according to any one of claims 1 to 4, wherein the opening diameter of the opening is larger than the inner diameter of the second flow path portion and the inner diameter of the third flow path portion. The driving device according to any one of claims 1 to 5, wherein the third flow path portion overlaps with the opening when viewed in a direction extending from the branch portion. The first flow path portion is a refrigerant introduction section that allows the refrigerant to flow into the branch portion, and the second flow path portion and the third flow path portion are refrigerant discharge sections that allow the refrigerant to flow out from the branch portion. The drive device according to any one of claims 1 to 6. Looking in the thickness direction,
The angle formed by the direction in which the first flow path portion extends from the branch portion and the direction in which the second flow path portion extends from the branch portion is
The driving device according to claim 7, wherein the angle is larger than the angle formed by the direction in which the first flow path portion extends from the branch portion and the direction in which the third flow path portion extends from the branch portion. The drive according to claim 8, wherein the upper end of the second flow path portion in the vertical direction is located above the upper end of the branch portion and the third flow path portion in the vertical direction. apparatus. Seen in the thickness direction, with reference to a virtual line extending in a direction orthogonal to the extending direction in which the first flow path portion extends and passing through the center of the branching portion in the extending direction.
The third flow path portion is located in the region on the side where the first flow path portion is located.
The driving device according to any one of claims 7 to 9, wherein the second flow path portion is located in a region opposite to the side where the first flow path portion is located. A female screw portion is provided on the inner peripheral surface of the branch portion.
The driving device according to any one of claims 1 to 10, wherein the plug member is a bolt tightened to the female screw portion. The drive device according to claim 11, wherein a sealing portion is provided to seal between the peripheral edge of the opening of the branch portion and the bolt head of the plug member. The drive device according to any one of claims 1 to 12, which is mounted on a vehicle and rotates an axle of the vehicle.

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