JP7310259B2 - motor unit - Google Patents

Description

The present invention relates to a motor unit.

Japanese Patent Laying-Open No. 2016-73163 discloses a structure in which a cooling device provided outside a rotating electrical machine cools a coolant, and a pump provided outside the rotating electrical machine supplies the coolant to a motor.

JP 2016-73163 A

However, in the case of the configuration disclosed in Japanese Patent Application Laid-Open No. 2016-73163, in which the pump and the cooling device are arranged outside the rotating electrical machine, the rotating electrical machine becomes large, which may make installation difficult.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a motor unit that can be downsized while maintaining cooling efficiency.

An exemplary motor unit of the present invention includes: a motor having a motor shaft that rotates around a motor shaft extending in a horizontal direction; a gear portion connected to the motor shaft on one axial side of the motor shaft; a housing containing the motor and the gear; and a pump for supplying oil contained in the housing to the motor. The housing comprises a motor containing portion containing the motor and the gear. a pump housing portion housing the pump and forming a pump chamber therein; an oil inflow hole connecting the gear housing portion and the pump chamber; and the pump chamber and the motor housing portion and an oil pipe portion connecting the pump housing portion to the gear housing portion vertically below the motor housing portion and adjacent to the gear housing portion on the other side in the axial direction of the motor shaft, and the pump The oil in the gear housing portion is sucked into the pump chamber through the oil inflow hole, and the oil in the pump chamber is supplied to the motor in the motor housing portion through the oil piping portion.

According to the exemplary motor unit of the present invention, the overall size can be reduced while maintaining cooling efficiency.

FIG. 1 is a conceptual diagram of a motor unit of one embodiment. FIG. 2 is a perspective view of the motor unit. FIG. 3 is a cross-sectional view of the motor unit cut along a plane perpendicular to the motor shaft. FIG. 4 is a perspective view showing a gear portion of the motor unit. FIG. 5 is a cross-sectional view showing the pump. FIG. 6 is a schematic cross-sectional view of an oil cooler. FIG. 7 is an exploded view of the housing. FIG. 8 is a perspective view of the second housing member as seen from the inside. FIG. 9 is a diagram showing a schematic arrangement inside the gear housing. FIG. 10 is an enlarged perspective view of the pump housing. FIG. 11 is a schematic diagram of an oil cooler mounting portion to which the oil cooler is mounted. FIG. 12 is a side view of the housing; FIG. 13 is a perspective view showing the arrangement of the motor oil reservoir and motor. FIG. 14 is a plan view showing the arrangement of the motor oil reservoir and motor. 15 is a perspective view of a side plate portion of the first housing member; FIG. FIG. 16 is an enlarged perspective view of the connecting portion of the oil reservoir plate with the side plate portion. FIG. 17 is an enlarged perspective view of the insertion hole of the first housing member and the third gear bearing holding portion. FIG. 18 is a perspective view showing a modification of the motor oil reservoir and the arrangement of the motor. FIG. 19 is a plan view showing a modification of the motor oil reservoir and the arrangement of the motor.

A motor unit according to an embodiment of the present invention will be described below with reference to the drawings. It should be noted that the scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention.

In the following description, the gravitational direction is defined based on the positional relationship when the motor unit 1 is mounted on a vehicle positioned on a horizontal road surface. Also, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction indicates the vertical direction (that is, the vertical direction), the +Z direction is the upper side (the side opposite to the direction of gravity), and the −Z direction is the lower side (the direction of gravity). The X-axis direction is perpendicular to the Z-axis direction and indicates the longitudinal direction of the vehicle in which the motor unit 1 is mounted. However, the +X direction may be the rear of the vehicle and the -X direction may be the front of the vehicle. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and indicates the width direction (horizontal direction) of the vehicle. The +Y direction is the left side of the vehicle, and the -Y direction is the right side of the vehicle. is. However, if the +X direction is the rear side of the vehicle, the +Y direction may be the right side of the vehicle and the -Y direction may be the left side of the vehicle. That is, regardless of the direction of the X-axis, the +Y direction is simply one side in the left-right direction of the vehicle, and the -Y direction is the other side in the left-right direction of the vehicle. Depending on how the motor unit 1 is mounted on the vehicle, the X-axis direction may be the width direction (horizontal direction) of the vehicle, and the Y-axis direction may be the longitudinal direction of the vehicle.

In the following description, unless otherwise specified, the direction parallel to the motor shaft J2 of the motor 2 (Y-axis direction) is simply called the "axial direction", and the radial direction orthogonal to the motor shaft J2 is simply called the "radial direction". , the circumferential direction centered on the motor shaft J2 is simply referred to as the "circumferential direction". Furthermore, the above-mentioned "parallel direction" includes not only completely parallel directions but also substantially parallel directions.

<1. Motor unit 1>
A motor unit 1 according to an exemplary embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of a motor unit 1 of one embodiment. FIG. 2 is a perspective view of the motor unit 1. FIG. FIG. 3 is a cross-sectional view of the motor unit 1 taken along a plane perpendicular to the motor shaft J2. Note that FIG. 1 is only a conceptual diagram, and the arrangement and dimensions of each part are not necessarily the same as those of the actual motor unit 1 . 3, illustration of the inverter unit 7 is omitted.

The motor unit 1 is mounted on a vehicle using at least a motor as a power source, such as a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), or the like. The motor unit 1 is used as a power source for the above automobile.

As shown in FIG. 1 , the motor unit 1 has a motor (main motor) 2 , a gear portion 3 , a pump 4 , a housing 5 and an inverter unit 7 .

As shown in FIG. 1, the motor 2 has a rotor 21 that rotates around a horizontally extending motor shaft J2 and a stator 25 that is positioned radially outside the rotor 21 . A housing space 6 for housing the motor 2 and the gear portion 3 is provided inside the housing 5 . The accommodation space 6 is divided into a motor accommodation portion 61 that accommodates the motor 2 and a gear accommodation portion 62 that accommodates the gear portion 3 .

<2. motor 2>
The motor 2 is housed in the motor housing portion 61 of the housing 5 . The motor 2 has a rotor 21 and a stator 25 .

<2.1 Rotor 21>
The rotor 21 rotates when power is supplied to the stator 25 from a battery (not shown). The rotor 21 has a motor shaft 22, a rotor core 23, and a rotor magnet 24 (see FIG. 3). The rotor 21 rotates around a horizontally extending motor shaft J2. That is, the motor 2 has a motor shaft 22 that rotates around a motor shaft J2 extending in the horizontal direction.

The motor shaft 22 extends around a motor shaft J2 that extends horizontally and in the width direction of the vehicle. The motor shaft 22 rotates about the motor axis J2. The motor shaft 22 is a hollow shaft provided with a hollow portion 220 having an inner peripheral surface extending along the motor shaft J2.

The motor shaft 22 extends across the motor accommodating portion 61 and the gear accommodating portion 62 of the housing 5 . One end (+Y side) of the motor shaft 22 protrudes toward the gear housing portion 62 . A first gear 311 of the gear portion 3 , which will be described later, is fixed to the end portion of the motor shaft 22 protruding into the gear housing portion 62 . The motor shaft 22 is rotatably supported by a first motor bearing 281 held by the closing member 53 and a second motor bearing 282 held by the side plate portion 512 , which will be described later of the housing 5 .

Further, the portion of the motor shaft 22 disposed in the gear housing portion 62 includes a first gear bearing 341 held by the side plate portion 512 and a second gear held by a second housing member 52 of the housing 5 . It is rotatably supported by bearings 342 . Note that the motor shaft 22 may be divided into a portion inside the motor housing portion 61 and a portion inside the gear housing portion 62 . If the motor shaft 22 is splittable, the split motor shaft 22 may employ, for example, a threaded coupling using male and female threads. Alternatively, they may be joined by a fixing method such as welding.

Rotor core 23 is formed by laminating silicon steel plates. The rotor core 23 is a cylindrical body extending along the axial direction. A plurality of rotor magnets 24 are fixed to the rotor core 23 . A plurality of rotor magnets 24 are arranged along the circumferential direction with magnetic poles alternated.

<2.2 Stator 25>
The stator 25 surrounds the rotor 21 from the radial outside. That is, the motor 2 is an inner rotor type motor in which the rotor 21 is rotatably arranged inside the stator 25 . Stator 25 has stator core 26 , coil 27 , and an insulator (not shown) interposed between stator core 26 and coil 27 . The stator 25 is held by the housing 5 . The stator core 26 has a plurality of magnetic pole teeth 261 (see FIG. 3) radially inward from the inner peripheral surface of the annular yoke.

A coil wire is wound between the magnetic pole teeth 261 . A coil wire wound around the magnetic pole teeth 261 constitutes the coil 27 . The coil wire is connected to the inverter unit 7 via a bus bar (not shown). The coil 27 has coil ends 271 protruding from the axial end face of the stator core 26 . The coil end 271 axially protrudes from the end of the rotor core 23 of the rotor 21 .

<3. Gear part 3>
The gear portion 3 transmits the driving force of the motor to the drive shaft Ds that drives the wheels of the vehicle. Details of the gear portion 3 will be described with reference to the drawings. 4 is a perspective view showing the gear portion 3 of the motor unit 1. FIG. As shown in FIGS. 1 and 4 , the gear portion 3 is housed in the gear housing portion 62 of the housing 5 . The gear portion 3 is connected to the motor shaft 22 on one axial side of the motor shaft J2. The gear portion 3 has a reduction gear 31 and a differential gear 32 .

<3.1 Reduction gear 31>
As shown in FIGS. 1 and 4, the reduction gear 31 is connected to the motor shaft 22 . That is, the gear portion 3 is connected to the motor shaft 22 on one axial side of the motor shaft J2. The reduction gear 31 has a function of reducing the rotational speed of the motor 2 and increasing the torque output from the motor 2 according to the reduction ratio. The reduction gear 31 transmits the torque output from the motor 2 to the differential gear 32 .

The reduction gear 31 has a first gear (intermediate drive gear) 311 , a second gear (intermediate gear) 312 , a third gear (final drive gear) 313 and an intermediate shaft 314 . Torque output from motor 2 is transmitted to ring gear (gear) 321 of differential 32 via motor shaft 22 , first gear 311 , second gear 312 , intermediate shaft 314 and third gear 313 . The gear ratio of each gear, the number of gears, and the like can be changed variously according to the required reduction ratio. The speed reducer 31 is a parallel shaft gear type speed reducer in which the axes of the gears are arranged in parallel.

The first gear 311 is provided on the outer peripheral surface of the motor shaft 22 . The first gear 311 may be the same member as the motor shaft 22, or may be a separate member that is firmly fixed. The first gear 311 rotates together with the motor shaft 22 about the motor axis J2.

The intermediate shaft 314 extends along an intermediate axis J4 parallel to the motor axis J2. Both ends of the intermediate shaft 314 are rotatably supported by a third gear bearing 343 held by the side plate portion 512 of the first housing member 51 and a fourth gear bearing 344 held by the second housing member 52 .

The intermediate shaft 314 is rotatably supported by the housing 5 about the intermediate axis J4. A second gear 312 and a third gear 313 are provided on the outer peripheral surface of the intermediate shaft 314 . The second gear 312 may be the same member as the intermediate shaft 314, or may be a separate member that is firmly fixed. The third gear 313 is also similar to the second gear 312 . The third gear 313 is located on the side plate portion 512 side with respect to the second gear 312 .

The second gear 312 and the third gear 313 are connected via an intermediate shaft 314 . The second gear 312 and the third gear 313 rotate around the intermediate shaft J4. The second gear 312 meshes with the first gear 311 . The third gear 313 meshes with the ring gear 321 of the differential gear 32 .

Torque of the motor shaft 22 is transmitted from the first gear 311 to the second gear 312 . The torque transmitted to the second gear 312 is then transmitted to the third gear 313 via the intermediate shaft 314 . Furthermore, the torque transmitted to the third gear 313 is transmitted to the ring gear 321 of the differential gear 32 . In this manner, the reduction gear 31 transmits the torque output from the motor 2 to the differential gear 32 .

<3.2 Differential gear 32>
The differential gear 32 is attached to the drive shaft Ds of the vehicle. The differential gear 32 transmits the output torque of the motor 2 to the drive shaft Ds. The drive shafts Ds are attached to the left and right sides of the differential gear 32, respectively. The differential gear 32 has a function of transmitting the same torque to the left and right drive shafts Ds while absorbing the speed difference between the left and right wheels (drive shafts Ds), for example, when the vehicle turns. The differential gear 32 has a ring gear 321, 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 321 rotates around a differential shaft J5 parallel to the motor shaft J2. Torque output from the motor 2 is transmitted to the ring gear 321 via the reduction gear 31 .

<3.3 Parking Mechanism 33>
For example, an electric vehicle does not have a braking mechanism for braking the vehicle other than a side brake. Therefore, the motor unit 1 may be provided with a parking mechanism 33 that locks the vehicle when the shift lever (not shown) is moved to the parking position.

As shown in FIG. 4 , the parking mechanism 33 has a parking gear 331 , a rotation blocking portion 332 and a parking motor 333 . The parking gear 331 is fixed to the intermediate shaft 314 and rotates together with the intermediate shaft 314 around the intermediate axis J4. The rotation blocking portion 332 moves between the teeth of the parking gear 331 to block the rotation of the parking gear 331 . The parking motor 333 drives the rotation blocker 332 .

During operation of the motor 2 , the rotation blocking portion 332 is retracted from the parking gear 331 . The retraction of the rotation blocking portion 332 from the parking gear 331 is performed by, for example, an elastic member such as a spring. On the other hand, when the shift lever is in the parking position, the parking motor 333 moves the rotation blocking portion 332 between the teeth of the parking gear 331 . As a result, the rotation blocking portion 332 blocks the rotation of the parking gear 331 and maintains the vehicle in the braking state. If the vehicle is an HV, PHV, etc., and has an internal combustion engine and a transmission, the parking mechanism 33 can be omitted.

<4. Pump 4>
Pump 4 supplies oil CL to motor 2 . That is, the pump 4 supplies the motor 2 with the oil CL housed in the housing 5 . The pump 4 is an electric pump driven by electricity. Details of the pump 4 will be described with reference to the drawings. FIG. 5 is a cross-sectional view showing the pump 4. As shown in FIG. As shown in FIG. 5, the pump 4 is housed in a pump housing portion 54 of the housing 5, which will be described later, and a pump chamber 540 is formed inside the pump housing portion 54. As shown in FIG.

As shown in FIG. 5 , the pump 4 has a pump motor 41 , a compression section 42 , a pump case 43 , a lid section 44 and cooling fins 45 . Pump motor 41 is an inner rotor motor having stator 411 and rotor 412 . The rotor 412 has a pump shaft 413 that rotates around a horizontally extending pump axis J6. In this embodiment, the pump axis J6 is parallel to the motor axis J2. That is, the pump shaft J6 is parallel to the motor shaft J2. It should be noted that the pump shaft J6 does not have to be parallel to the motor shaft J2. Since the pump/motor 41 has a conventionally well-known structure, the details thereof are omitted. That is, the pump 4 further has a pump motor 41 with a pump shaft 413 rotating about a pump axis J6.

The compression portion 42 has an internal space 420 arranged on one axial side of the pump shaft J6. And it has the suction port 421 and the discharge port 422 which connect the internal space 420 of the compression part 42, and the external space. The compression part 42 is a trochoidal pump that rotates with an external gear and an internal gear (not shown) meshing. The compression part 42 has an external gear and an internal gear inside the internal space 420 . The internal gear is then attached to the pump shaft 413 and rotated by the pump motor 41 . That is, the pump 4 further has a compression portion 42 to which the pump shaft 413 is connected on one axial side of the pump shaft J6. Note that the compression unit 42 may be a pump other than the trochoidal pump, such as a centrifugal pump.

The suction port 421 has a tubular shape protruding to one axial side (+Y direction side) of the pump shaft J6. That is, the suction port 421 of the compression portion 42 has a cylindrical shape protruding from the end surface of the pump shaft J6 on one side in the axial direction. The inside of the suction port 421 is connected with the internal space 420 . In addition, the discharge port 422 is provided in the wall surface of the inner space 420 on one axial side (+Y direction side) of the pump shaft J6. The compression part 42 sucks the oil CL from the suction port 421 and discharges it from the discharge port 422 by rotating the internal gear arranged in the internal space 420 . That is, the compression portion 42 has a suction port 421 that sucks the oil CL and a discharge port 422 that discharges the oil CL.

In the compression portion 42, the central axis J7 of the suction port 421 is shifted from the pump axis J6. By forming in this way, it is easy to secure a place for forming the discharge port 422 . In addition, the suction port 421 is inserted into an oil inflow hole 541 provided in the pump accommodating portion 54, which will be described later. That is, the suction port 421 has a tubular shape that can be inserted into the oil inlet hole 541 .

By inserting the suction port 421 into the oil inflow hole 541 , the oil CL in the gear housing portion 62 can be efficiently sucked through the suction port 421 . As a result, the pump 4 can be stabilized, the motor 2 can be efficiently cooled, and the decrease in efficiency of the motor 2 due to temperature rise can be suppressed.

Further, since the central axis J7 of the suction port 421 is displaced from the pump axis J6, positioning of the pump 4 in the circumferential direction when the pump 4 is attached is facilitated. Thereby, the productivity of the motor unit 1 can be improved. Further, as shown in FIG. 5, the central axis J7 of the suction port 421 is below the pump axis J6. By configuring in this way, it is possible to suck in the oil CL at a low position, and the pump 4 is less likely to suck in air.

The pump case 43 is a cylindrical member. The compression portion 42 is arranged on one axial side (+Y direction side) of the pump shaft J6 of the pump case 43 . Also, the pump motor 41 is housed inside the pump case 43 . The other axial side (−Y direction side) of the pump case 43 with respect to the pump shaft J6 is open, and the opening is closed with a lid portion 44 . The lid portion 44 prevents water, dirt, dust, etc. from entering the pump case 43 . A circuit board, a bus bar, and the like (not shown) are provided on the lid portion 44 . The circuit board is connected to the inverter unit 7, and the power supplied to the circuit board is supplied to the pump motor 41 via the busbar. The lid portion 44 also serves as a lid that closes the opening of the pump accommodating portion 54 (pump chamber 540). By closing the pump accommodating portion 54 with the lid portion 44, the pump chamber 540 is sealed in a state in which the oil CL is less likely to leak. That is, the pump 4 further has a lid portion 44 that closes the opening of the pump chamber 540 .

The cooling fins 45 are arranged outside the lid portion 44 . The cooling fins 45 may be the same member as the lid portion 44, or may be a separate member. The cooling fins 45 are plate-shaped and extend horizontally, and are arranged side by side in the vertical direction (Z direction). That is, the lid portion 44 has a plurality of cooling fins 45 arranged on the outer surface, and the plurality of cooling fins 45 extend horizontally and are arranged in a direction intersecting the horizontal direction with gaps between them.

In FIG. 5, the vehicle runs in the depth direction of the paper. Therefore, in the pump 4, the cooling fins 45 are cooled by running wind. That is, the pump 4 is cooled by running wind as the vehicle runs.

A strainer 46 is connected to the suction port 421 of the pump 4 . The strainer 46 has an inlet opening 461 and an outlet 462 . An inflow opening 461 is provided on the bottom surface of the strainer 46 . The outflow portion 462 has a tubular shape extending in the axial direction. The outflow portion 462 is inserted from the opening of the oil inflow hole 541 on the side of the gear housing portion 62 . That is, the oil CL is stored in the lower part inside the gear housing portion 62 , and the strainer 46 is arranged inside the gear housing portion 62 and connected to the oil inflow hole 541 . The strainer 46 has an inflow opening 461 on its lower surface.

The strainer 46 is arranged in an oil reservoir P (see FIGS. 1, 9, etc.) of the gear housing portion 62 of the housing 5, which will be described later. When the pump 4 is driven, the strainer 46 sucks the oil CL from the inflow opening 461 and supplies it to the suction port 421 of the pump 4 from the outflow portion 462 . By providing the strainer 46, the pump 4 can suck the oil CL even when the amount of the oil CL is reduced and the oil level of the oil CL is lowered. A filtration structure such as a filter (not shown) may be attached to the strainer 46 . If the pump 4 can stably suck the oil CL, the strainer may be omitted. However, in order to prevent foreign matter from entering the pump 4 and the motor 2, a strainer having a filter is preferably provided.

<5. Oil cooler 8>
The oil CL sucked from the oil sump P by the pump 4 flows into the oil cooler 8 provided in the middle of the path of the oil pipe portion 55, which will be described later. The oil cooler 8 cools the oil CL flowing through the oil pipe portion 55 . A configuration of the oil cooler 8 will be described with reference to the drawings. FIG. 6 is a schematic cross-sectional view of the oil cooler 8. As shown in FIG. The oil cooler 8 shown in FIG. 6 omits an inflow pipe and an outflow pipe for the refrigerant.

As shown in FIGS. 1 and 2, the inverter unit 7 is connected to a refrigerant pipe 71 extending from a radiator (not shown). Cooling water (refrigerant) that has cooled the inverter unit 7 is allowed to flow in, and heat is exchanged between the cooling water and the oil CL to cool the oil CL. Note that in the present embodiment, the oil CL is cooled by the cooling water used to cool the inverter unit 7, but the present invention is not limited to this. A pipe separate from the refrigerant pipe for cooling the inverter unit 7 may be provided.

As shown in FIG. 6 , the oil cooler 8 has an oil channel 81 and a coolant channel 82 . Also, the oil cooler 8 has a plurality of fins 80 . The fins 80 are arranged at intervals, and the interior of the oil cooler 8 is divided into a plurality of layers. The plurality of layers form an oil channel 81 through which the oil CL alternately flows and a coolant channel 82 through which the coolant flows. That is, the oil cooler 8 has a refrigerant flow path 82 through which the refrigerant flows and an oil flow path 81 through which the oil CL flows.

The oil flow path 81 has an inflow pipe 811 , a bypass pipe 812 and an outflow pipe 813 . The inflow pipe 811 allows the oil CL to flow into the oil cooler 8 . Inlet piping 811 is connected to the top layer divided by fins 80 . A bypass pipe 812 is a pipe that connects to the next layer skipped by one. As shown in FIG. 6, the bypass pipe 812 is arranged at a position distant from the inflow pipe 811 . By arranging in this way, each layer of the oil flow path 81 is filled with the oil CL. Thereby, the heat exchange efficiency between the refrigerant water and the oil CL can be enhanced. Then, the oil CL is discharged to the outside through the outflow pipe 813 from the lowest layer. The oil CL flowing out from the outflow pipe 813 flows into the oil pipe portion 55 and is supplied to the motor accommodating portion 61 .

In the oil cooler 8 according to this embodiment, the outflow pipe 813 is arranged to pass through the bypass pipe 812 . However, without being limited to this, the bypass pipe 812 and the outflow pipe 813 may be provided at different positions. Further, the coolant channel 82 has a structure that allows cooling water to alternately flow into a plurality of layers, similar to the oil cooler 8 .

As shown in FIGS. 2 and 3, the oil cooler 8 has a rectangular parallelepiped shape. The inflow pipe 811 and the outflow pipe 813 of the oil flow path 81 may be arranged diagonally. Also, the inflow pipe and the outflow pipe (not shown) for the refrigerant may be arranged diagonally. By arranging in this way, the oil CL and the refrigerant can be spread over the oil flow path 81 and the refrigerant flow path 82, respectively, and heat can be exchanged efficiently. Also, the size of the oil cooler 8 can be reduced.

<6. housing 5>
7 is an exploded view of the housing 5. FIG. As shown in FIG. 7 , the housing 5 has a first housing member 51 , a second housing member 52 and a closing member 53 . The second housing member 52 is positioned on one axial side (+Y direction side) of the first housing member 51 . The closing member 53 is positioned on the other axial side (−Y direction side) of the first housing member 51 . The housing 5 may be composed of four or more members.

1 and 7, the housing 5 has an accommodation space 6 inside. The housing space 6 houses the motor 2 and the gear portion 3 . The accommodation space 6 of the housing 5 is partitioned into a motor accommodation portion 61 and a gear accommodation portion 62 by a side plate portion 512 which will be described later. The motor 2 is housed in the motor housing portion 61 . The gear housing portion 62 houses the gear portion 3 (that is, the reduction gear 31 and the differential gear 32). The closing member 53 is fixed to the peripheral wall portion 511 of the first housing member 51 . The closing member 53 closes the opening of the tubular first housing member 51 . That is, the housing 5 includes a first housing member 51 provided on the other axial side (-Y direction side) of the motor shaft J2 and a second housing member provided on one axial direction side (+Y direction side) of the motor shaft J2. 52 and have.

The motor 2 is accommodated in a space surrounded by the peripheral wall portion 511 of the first housing member 51 and the closing member 53 . That is, the peripheral wall portion 511 and the closing member 53 constitute the motor housing portion 61 . Similarly, the gear portion 3 is accommodated in a space surrounded by the side plate portion 512 of the first housing member 51 and the second housing member 52 . The side plate portion 512 and the second housing member 52 constitute the gear housing portion 62 . That is, the housing 5 accommodates the motor 2 and the gear portion 3 . That is, the housing 5 has a motor accommodating portion 61 that accommodates the motor 2 and a gear accommodating portion 62 that accommodates the gear portion 3 .

The first housing member 51 includes a peripheral wall portion 511, a side plate portion 512, an insertion hole 514, a first drive shaft passage hole 515, a second motor bearing holding portion 516, a first gear bearing holding portion 517, and a first gear bearing holding portion 517. It has a 3-gear bearing holding portion 518 and a side plate opening 519 .

The peripheral wall portion 511 has a tubular shape extending in the axial direction. The motor 2 is accommodated inside the peripheral wall portion 511 . A space inside the peripheral wall portion 511 constitutes the motor housing portion 61 . The side plate portion 512 has a partition wall portion 510 and a protruding portion 513 that are vertically continuous. In the first housing member 51 of this embodiment, the peripheral wall portion 511 and the side plate portion 512 are formed of the same member. The partition wall portion 510 closes one axial end (+Y direction side) of the peripheral wall portion 511 .

The protruding portion 513 is a portion on the lower side in the vertical direction (the −Z direction side) of the partition wall portion 510 and protrudes below the peripheral wall portion 511 . A first drive shaft passage hole 515 is provided in the projecting portion 513 . The drive shaft Ds passes through the first drive shaft passage hole 515 in a rotatable state. An oil seal (not shown) is provided between the drive shaft Ds and the first drive shaft passage hole 515 to suppress leakage of the oil CL. An axle (not shown) for rotating wheels is connected to the tip of the drive shaft Ds. In addition, a pump accommodating portion 54 (see FIG. 5) is provided on the other axial side (−Y direction side) of the projecting portion 513 .

The insertion hole 514 is formed in the partition wall portion 510 and penetrates in the axial direction. The center of the insertion hole 514 coincides with the motor shaft J2. The motor shaft 22 is inserted through the insertion hole 514 .

The second motor bearing holding portion 516 has a tubular shape extending from the edge portion of the insertion hole 514 to the other side in the axial direction (−Y direction side). The outer ring of the second motor bearing 282 is fixed to the second motor bearing holding portion 516 . The motor shaft 22 is fixed to the inner ring of the second motor bearing 282 .

A first motor bearing holding portion 531 is provided on one axial side (+Y direction side) of the closing member 53 . The central axes of the first motor bearing holding portion 531 and the second motor bearing holding portion 516 coincide with the motor axis J2. The first motor bearing 281 is held by the first motor bearing holding portion 531 . The motor shaft 22 is fixed to the inner ring of the first motor bearing 281 . Thereby, the motor 2 is rotatably supported by the housing 5 via the first motor bearing 281 and the second motor bearing 282 at both axial ends of the rotor 21 .

Also, the first gear bearing holding portion 517 has a tubular shape extending from the edge portion of the insertion hole 514 to one axial direction side (+Y direction side). The outer ring of the first gear bearing 341 is fixed to the first gear bearing holding portion 517 . A motor shaft 22 is fixed to the inner ring of the first gear bearing 341 .

A second gear bearing holding portion 521 is provided on the other axial side (−Y direction side) of the second housing member 52 . The central axes of the second gear bearing holding portion 521 and the first gear bearing holding portion 517 coincide with the motor shaft J2. The second gear bearing 342 is held by the second gear bearing holding portion 521 . The motor shaft 22 is fixed to the inner ring of the second gear bearing 342 . Thereby, the motor shaft 22 is held by the side plate portion 512 and the second housing member 52 via the first gear bearing 341 and the second gear bearing 342 . The motor shaft 22 is rotatably supported by a first motor bearing 281 , a second motor bearing 282 , a first gear bearing 341 and a second gear bearing 342 .

The third gear bearing holding portion 518 has a tubular shape extending from the side plate portion 512 to one side in the axial direction (+Y direction side). The third gear bearing holding portion 518 is provided below the first gear bearing holding portion 517 (−Z direction side). The central axis of the third gear bearing holding portion 518 coincides with the intermediate shaft J4. An outer ring of the third gear bearing 343 is fixed to the third gear bearing holding portion 518 . Also, the intermediate shaft 314 is fixed to the inner ring of the third gear bearing 343 .

A fourth gear bearing holding portion 522 is provided on the other axial side (−Y direction side) of the second housing member 52 . The central axes of the third gear bearing holding portion 518 and the fourth gear bearing holding portion 522 coincide with the intermediate shaft J4. The fourth gear bearing 344 is held by the fourth gear bearing holding portion 522 . Also, the intermediate shaft 314 is fixed to the inner ring of the fourth gear bearing 344 . Thereby, the intermediate shaft 314 is held by the side plate portion 512 and the second housing member 52 via the third gear bearing 343 and the fourth gear bearing 344 .

The side plate opening 519 is provided in the side plate portion 512 that separates the motor housing portion 61 and the gear housing portion 62 . The side plate opening 519 allows the motor housing portion 61 and the gear housing portion 62 to communicate with each other. The side plate opening 519 moves the oil CL accumulated in the lower region inside the motor housing portion 61 to the gear housing portion 62 . The oil CL that has moved to the gear housing portion 62 flows into (returns to) the oil reservoir P.

FIG. 8 is a perspective view of the second housing member 52 as seen from the inside. The second housing member 52 is fixed to one axial side (+Y direction side) of the side plate portion 512 of the first housing member 51 . The shape of the second housing member 52 is a concave shape that opens on the side plate portion 512 side. The opening of the second housing member 52 is covered with the side plate portion 512 . As shown in FIG. 8, the second housing member 52 includes a second gear bearing holding portion 521, a fourth gear bearing holding portion 522, a second drive shaft passage hole 523, an oil reservoir plate 524, and an oil supply hole. 525.

As described above, the second gear bearing holding portion 521 has a tubular shape protruding toward the other side in the axial direction (the −Y direction side), and the outer ring of the second gear bearing 342 is fixed. In addition, the fourth gear bearing holding portion 522 is arranged below the second gear bearing holding portion 521 (-Z direction side). The fourth gear bearing holding portion 522 has a tubular shape protruding toward the other axial side (−Y direction side), and the outer ring of the fourth gear bearing 344 is fixed thereto.

The second drive shaft passage hole 523 is a hole that axially penetrates the second housing member 52 . The drive shaft Ds passes through the first drive shaft passage hole 515 in a rotatable state. An oil seal (not shown) is provided between the drive shaft Ds and the first drive shaft passage hole 515 to suppress leakage of the oil CL. An axle (not shown) for rotating wheels is connected to the tip of the drive shaft Ds. The second drive shaft passage hole 523 overlaps the first drive shaft passage hole 515 when viewed in the axial direction. As a result, the drive shafts Ds arranged at both ends in the axial direction (Y direction) of the differential device 32 rotate around the differential shaft J5.

FIG. 9 is a diagram showing a schematic layout inside the gear housing portion 62. As shown in FIG. As shown in FIG. 9, an oil reservoir P in which oil CL is accumulated is provided in the lower region within the gear housing portion 62 . A part of the differential gear 32 is immersed in the oil pool P. The oil CL accumulated in the oil reservoir P is raked up by the operation of the differential gear 32 and supplied to the inside of the gear accommodating portion 62 . That is, the oil CL is raked up by the tooth surface of the ring gear 321 when the ring gear 321 of the differential gear 32 rotates.

In the diagram shown in FIG. 9, the first gear 311 and the ring gear 321 rotate counterclockwise. Also, the second gear 312 rotates clockwise. Part of the second gear 312 and the ring gear 321 is immersed in the oil CL when the motor 2 is operating from a stopped state. Therefore, the rotation of the second gear 312 and the ring gear 321 causes the oil CL to be raked upward along the inner peripheral surface of the second housing member 52 . The oil CL raked up by the second gear 312 is dropped directly onto the first gear 311 , the second gear 312 and the third gear 313 . The oil CL used for lubricating the reduction gear 31 and the differential gear 32 drips and is collected in the oil reservoir P located below the gear accommodating portion 62 .

The oil CL diffused into the gear housing portion 62 is supplied to the gears of the reduction gear 31 and the differential gear 32 in the gear housing portion 62 to spread the oil CL over the tooth flanks of the gears and used for lubrication. Also, part of the oil CL diffused into the gear housing portion 62 is supplied to each of the first gear bearing 341 to the fourth gear bearing 344 and used for lubrication.

The second housing member 52 has an oil reservoir pan 524 and an abutment wall 5100 . The oil reservoir plate 524 opens upward and extends in the axial direction. The oil reservoir plate 524 is formed along both ends of the gear housing portion 62 in the axial direction. Abutting wall 5100 is arranged above oil reservoir plate 524 . When the oil CL raked up by the ring gear 321 contacts the contact wall 5100 , it flows from the contact wall 5100 into the oil reservoir plate 524 .

As shown in FIG. 8 , the oil supply hole 525 connects the axial one side (+Y direction side) end of the oil reservoir plate 524 and the axial center of the second gear bearing holding portion 521 . The oil CL accumulated in the oil reserve plate 524 flows through the oil supply hole 525 to the second gear bearing holding portion 521 . The oil CL that has flowed through the oil supply hole 525 flows from the second gear bearing holding portion 521 into the hollow portion 220 of the motor shaft 22 .

Oil CL flows into the hollow portion 220 of the motor shaft 22 . The oil CL in the hollow portion 220 of the motor shaft 22 flows into the motor shaft 22 from one end in the axial direction (+Y direction side) and flows toward the motor 2 . A groove or the like may be formed inside the hollow portion 220 of the motor shaft 22 to send the oil CL toward the motor 2 when the motor shaft 22 rotates. Oil CL that has flowed through hollow portion 220 is sprayed toward coil end 271 from oil spray hole 221 (see FIG. 1) provided in motor shaft 22 . The coil 27 is cooled by the oil CL.

Moreover, as shown in FIG. 8, the second housing member 52 has an oil supply groove 526 and an oil guide groove 527 . The rest of the oil CL supplied to the second gear bearing holding portion 521 through the oil supply hole 525 is supplied to the second gear bearing 342 held by the second gear bearing holding portion 521 . This lubricates the second gear bearing 342 . Furthermore, the oil CL that has lubricated the second gear bearing 342 flows downward. An oil guide groove 527 connected to the fourth gear bearing holding portion 522 is provided below the second gear bearing holding portion 521 . The oil CL that has flowed downward from the second gear bearing holding portion 521 flows through the oil guide groove 527 into the fourth gear bearing holding portion 522 . This lubricates the fourth gear bearing 344 . After that, the oil CL flows downward into the oil reservoir P.

Oil supply groove 526 extends downward. Also, part of the oil CL raked up by the ring gear 321 goes downward before reaching the oil reserve plate 524 . A further part of the downwardly directed oil CL flows through the oil supply groove 526 to the differential gear 32 . Thereby, each gear of the differential gear 32 is lubricated.

When the motor 2 is stopped, that is, when the motor unit 1 is stopped, part of the second gear 312 and part of the ring gear 321 are immersed in the oil CL. Further, during operation of the motor unit 1, the second gear 312 is not immersed in the oil CL, and a part of the ring gear 321 is immersed in the oil CL. For example, as shown in FIG. 9, the oil level of the oil filled in the oil reservoir P of the accommodation space 6 is the oil level P1 when the motor unit 1 is stopped, and is higher than the oil level P1 when the motor unit 1 is in operation. is also low oil level P2. By doing so, it is possible to reduce wasteful consumption of energy due to agitation of the oil CL while cooling and lubricating with the oil CL.

The first housing member 51 has a pump housing portion 54 and an oil pipe portion 55 . 10 is an enlarged perspective view of the pump accommodating portion 54. FIG. As shown in FIG. 1 and the like, the pump accommodation portion 54 is arranged below the motor accommodation portion 61 (on the −Z direction side). That is, the pump housing portion 54 is disposed vertically below the motor housing portion 61 and adjacent to the gear housing portion 62 on the other axial side of the motor shaft J2. The pump housing portion 54 has a pump chamber 540 , an oil inflow hole 541 and an oil outflow hole 542 . That is, the housing 5 has a pump accommodating portion 54 that accommodates the pump 4 and forms a pump chamber 540 therein.

The pump accommodating portion 54 further has an accommodating chamber peripheral wall portion 543 and an accommodating chamber side wall portion 544 . The storage chamber peripheral wall portion 543 has a tubular shape extending in the axial direction (Y direction). The accommodation chamber side wall portion 544 is part of the side plate portion 512 of the first housing member 51 and partially closes the end portion of the accommodation chamber peripheral wall portion 543 on one axial side (+Y direction side). A space surrounded by the storage chamber peripheral wall portion 543 and the storage chamber side wall portion 544 is the pump chamber 540 . The accommodation chamber peripheral wall portion 543 has an open end on the other axial side (−Y direction side). This opening is closed by the lid portion 44 of the pump 4 as described above. That is, the pump housing portion 54 includes a cylindrical housing chamber peripheral wall portion 543 extending in the axial direction of the motor shaft J2, and a housing chamber side wall portion 544 that partially closes one end of the motor shaft J2 in the axial direction. have more.

The oil inflow hole 541 is formed in the side wall portion 544 of the housing chamber. The oil inflow hole 541 is a hole extending in the axial direction, and as shown in FIG. opens into pump chamber 540 . That is, the housing 5 has an oil inlet hole 541 that connects the gear housing portion 62 and the pump chamber 540 .

The center of the oil inlet hole 541 coincides with the central axis J7 of the suction port 421 . That is, the center of the oil inflow hole 541 is located radially outside and vertically below the pump shaft J6 with respect to the pump shaft J6 when viewed from the axial direction of the pump shaft J6. As described above, the suction port 421 of the pump 4 is inserted into the opening of the oil inflow hole 541 on the pump chamber 540 side. An outflow portion 462 of the strainer 46 is attached to the opening of the oil inflow hole 541 on the side of the gear housing portion 62 . Therefore, the center of the suction port 421 of the pump 4 is similarly displaced from the pump axis J6. Therefore, in the pump 4 , it is easy to secure a place for forming the discharge port 422 .

By configuring the pump 4 and the pump housing portion 54 in this way, it is easy to position the pump 4 in the pump housing portion 54 in the circumferential direction. In addition, since the pump 4 is axially inserted through the opening of the pump accommodating portion 54, the attachment of the pump 5 to the housing 5 is easy, and the productivity of the motor unit 1 can be improved.

The oil outflow hole 542 is formed in the housing chamber peripheral wall portion 543 . The oil outflow hole 542 is connected to the oil pipe portion 55 provided outside the pump accommodating portion 54 . That is, the housing 5 has an oil pipe portion 55 that connects the pump chamber 540 and the motor housing portion 61 . The oil pipe portion 55 is connected to an oil outflow hole 542 on the housing chamber peripheral wall portion 543 . When the pump 4 is driven, the oil CL flows into the pump chamber 540 from the oil reservoir P of the gear housing portion 62 via (the strainer 46 attached to) the oil inlet hole 541 . When the pump chamber 540 is filled with the oil CL, the pressure of the oil CL in the pump chamber 540 increases. As a result, the oil CL flows into the oil pipe portion 55 from the oil outflow hole 542 . That is, the pump 4 sucks the oil CL in the gear housing portion 62 into the pump chamber 540 through the oil inflow hole 541, and the oil CL in the pump chamber 540 into the oil pipe portion 55 through the oil outflow hole 542. send out.

With this configuration, the pump 4 can be used to supply the oil CL in the gear housing portion 62 to the motor 2 in the motor housing portion 61 . As a result, the bearings of the motor 2 can be lubricated, and the rotation efficiency of the motor 2 can be improved. Further, since the motor 2 can be cooled by the oil CL, it is possible to suppress a decrease in the efficiency of the motor 2 due to the temperature rise of the motor 2 .

The oil pipe portion 55 is provided on the first housing member 51 . An oil cooler 8 is attached in the middle of the path of the oil pipe portion 55 . That is, an oil cooler 8 that cools the oil CL passing through the oil pipe portion 55 is provided in the path of the oil pipe portion 55 . FIG. 11 is a schematic diagram of an oil cooler attachment portion 56 to which the oil cooler 8 is attached. An oil cooler mounting portion 56 for mounting the oil cooler 8 is provided in the middle of the route of the oil pipe portion 55 . The oil cooler mounting portion 56 mounts the oil cooler 8 shown in FIGS. 2, 3, 6 and the like. The oil cooler mounting portion 56 has an oil supply hole 561 , an oil drain hole 562 , a coolant supply hole 563 , and a coolant discharge hole 564 .

The oil supply hole 561 and the oil drain hole 562 are connected to the oil flow path 81 of the oil cooler 8 . The oil CL flows into the oil cooler 8 through the oil supply hole 561 and returns to the oil pipe portion 55 through the oil drain hole 562 .

The coolant supply hole 563 and the coolant discharge hole 564 are connected to the coolant channel 82 of the oil cooler 8 . The refrigerant flows from the refrigerant pipe 71 through the refrigerant supply hole 563 into the refrigerant flow path 82 inside the oil cooler 8 and returns to the refrigerant pipe 71 through the refrigerant discharge hole 564 .

As shown in FIG. 11, in the oil cooler mounting portion 56, a line connecting the oil supply hole 561 and the oil drain hole 562 and a line connecting the refrigerant supply hole 563 and the refrigerant discharge hole 564 intersect (perpendicularly). . That is, the housing 5 further has an oil cooler mounting portion 56 for mounting the oil cooler 8 thereon. The oil cooler mounting portion 56 includes an oil supply hole 561 through which the oil CL flows into the oil flow path 81, an oil drain hole 562 through which the oil CL discharged from the oil flow path 81 flows, and a refrigerant flow path 82. It has a coolant supply hole 563 for inflow and a coolant discharge hole 564 for inflow of the coolant discharged from the coolant channel 82 . A line connecting the oil supply hole 561 and the oil discharge hole 562 and a line connecting the coolant supply hole 563 and the coolant discharge hole 564 intersect.

By configuring in this way, the oil CL can be distributed in the oil flow path 81 inside the oil cooler 8, and the cooling water (refrigerant) in the refrigerant flow path 82 can be distributed. From this, it is possible to improve the cooling efficiency of the oil CL in the oil cooler 8 .

Pump 4 and oil cooler 8 are attached to housing 5 . 12 is a side view of the housing 5. FIG. As shown in FIG. 12 , the pump 4 and oil cooler 8 attached to the housing 5 are arranged above the lower end of the housing 5 . That is, the pump accommodating portion 54 and the oil cooler 8 are arranged above the lower end of the gear accommodating portion 62 of the housing 5 when viewed in the axial direction of the motor shaft J2. By arranging in this way, the thickness of the motor unit 1 in the vertical direction (Z direction) can be reduced. That is, the size of the motor unit 1 can be reduced.

As shown in FIG. 1 , the oil pipe portion 55 connects the pump housing portion 54 and the oil cooler 8 and also connects the oil cooler 8 and the upper portion of the motor housing portion 61 . As shown in FIG. 3 , the oil pipe portion 55 is a tubular hole formed inside the first housing member 51 . The oil pipe portion 55 supplies the oil CL to a motor oil reservoir 57 provided in the upper portion of the motor housing portion 61 . That is, the oil pipe portion 55 has a supply hole 551 that opens to the upper portion of the motor housing portion 61 , and the motor oil reservoir 57 is arranged below the supply hole 551 . The oil CL supplied from the pump chamber 540 to the oil pipe portion 55 is pressurized by the pump 4 inside the pump chamber 540 . Therefore, the oil CL can flow into the oil pipe portion 55 extending upward from the pump chamber 540 .

Details of the motor oil reservoir 57 will now be described with reference to the drawings. 13 is a perspective view showing the arrangement of the motor oil reservoir 57 and the motor 2. FIG. 14 is a plan view showing the arrangement of the motor oil reservoir 57 and the motor 2. FIG. As shown in FIGS. 3, 13, etc., the motor oil reservoir 57 is a container with an upper opening. The motor oil reservoir 57 has a first supply hole 571, a second supply hole 572, and a third supply hole 573 on its bottom surface. The oil CL supplied from the oil pipe portion 55 to the motor oil reservoir 57 drops vertically downward (-Z direction) from the first supply hole 571, the second supply hole 572, and the third supply hole 573.

As shown in FIGS. 1 , 13 and 14 , the first supply holes 571 are arranged above the coil ends 271 of the coils 27 of the motor 2 . The coil 27 is cooled by the oil CL dropped from the first supply hole 571 .

The coil end 271 is supplied with the oil CL from the outside in the radial direction by dripping from the motor oil reservoir 57 and the oil CL from the inside in the radial direction by spraying from the oil spray hole 221 of the motor shaft 22 . Thereby, it is possible to improve the cooling efficiency of the coil 27 .

1, 13, and 14, the second supply hole 572 is arranged above the first motor bearing holding portion 531 and the second motor bearing holding portion 516. As shown in FIGS. The oil CL dripping from the second supply hole 572 drips onto the first motor bearing 281 and the second motor bearing 282, and the first motor bearing 281 and the second motor bearing 282 are lubricated by the oil CL.

Furthermore, as shown in FIGS. 13 and 14 , the third supply holes 573 are provided above the stator core 26 of the motor 2 . The oil CL dripped from the third supply hole 573 drips onto the stator core 26 . Then, the oil CL enters the stator core 26 through gaps in the stator core 26 and flows on the outer surface of the stator core 26 . Thereby, the stator core 26 and the coil 27 wound around the stator core 26 can be cooled.

The oil CL dripped from the motor oil reservoir 57 to cool the motor 2 and the oil CL to lubricate the first motor bearing 281 and the second motor bearing 282 flow to the lower portion of the motor accommodating portion 61 . As described above, the side plate portion 512 of the first housing member 51 is provided with the side plate opening 519 . The oil CL that has flowed to the lower portion of the motor housing portion 61 flows into the gear housing portion 62 through the side plate opening 519 . Then, the oil CL that has flowed into the gear housing portion 62 flows into the oil pool P below the gear housing portion 62 .

In this manner, the oil CL is forced into the motor housing 61 by the pump 4 to cool the motor 2 and lubricate the first motor bearing 281 and the second motor bearing 282 .

According to this embodiment, the pump 4 and the oil cooler 8 are arranged above the lower end of the housing 5 when viewed in the axial direction. That is, the pump 4 and the oil cooler 8 do not protrude further downward from the lower end of the housing 5 . Therefore, the size of the motor unit 1 can be reduced in the vertical direction.

The pump 4 and the oil cooler 8 are positioned below the motor accommodating portion 61 in the vertical direction. The motor unit 1 is arranged, for example, in the hood of the vehicle. Also, in the motor unit 1 , the pump 4 and the oil cooler 8 are protrusions that protrude with respect to the housing 5 . According to the present embodiment, by arranging the pump 4 and the oil cooler 8 below the motor accommodating portion 61 in the vertical direction, even if the vehicle collides with an object due to an accident or the like, the pump, which is a projecting object, can be displaced. 4 and the oil cooler 8 can be prevented from sticking into the object.

According to this embodiment, the pump 4 and the oil cooler 8 are fixed to the outer peripheral surface of the housing 5 . Therefore, compared to the case where the pump 4 and the oil cooler 8 are fixed to a structure outside the housing 5, the size of the motor unit 1 can be reduced. In addition, by fixing the pump 4 and the oil cooler 8 to the outer peripheral surface of the housing 5 , the oil pipe portion 55 can be arranged inside the housing 5 . Also from this, the motor unit 1 can be miniaturized.

<7. Inverter unit 7>
Inverter unit 7 is electrically connected to motor 2 . The inverter unit 7 controls the current supplied to the motor 2 . As shown in FIG. 2, the inverter unit 7 is fixed to the housing 5. As shown in FIG.

According to the present embodiment, at least a portion of the inverter unit 7 overlaps the ring gear 321 of the gear portion 3 when viewed in the axial direction. Therefore, even if the projected area viewed from the axial direction is made as small as possible along the outer shape of each gear of the gear portion 3, the configuration in which the inverter unit 7 overlaps the housing 5 viewed from the axial direction can be realized. As a result, it is possible to reduce the size of the motor unit 1 by suppressing an increase in the projected area of the motor unit 1 in the axial direction.

According to this embodiment, the inverter unit 7 is located on the opposite side of the oil cooler 8 with the motor shaft J2 interposed therebetween when viewed in the vertical direction. Therefore, it is possible to reduce the dimension of the motor unit 1 in the horizontal direction, and the size of the motor unit 1 can be reduced.

<8. Modifications, etc.>
15 is a perspective view of the side plate portion 512 of the first housing member 51. FIG. FIG. 16 is an enlarged perspective view of the connecting portion of the oil reservoir plate 524 and the side plate portion 512 . 17 is an enlarged perspective view of the insertion hole 514 of the first housing member 51 and the third gear bearing holding portion 518. FIG.

An oil flow groove 5110 is provided below the oil reservoir plate 524 of the side plate portion 512 . Oil flow groove 5110 extends toward first drive shaft passage hole 515 and opens downward. A differential device 32 is arranged below the oil flow groove 5110 . Oil CL overflowing from oil reservoir plate 524 flows into oil flow groove 5110 . The oil CL flowing through the oil flow groove 5110 drips onto the differential gear 32 through the opening. As a result, the differential gear 32 is lubricated by the oil CL. An oil storage groove 5111 extending axially along the differential gear 32 is provided below the oil flow groove 5110 . The oil CL scattered by the rotation of the differential gear 32 is stored in the oil storage groove 5111 . The oil CL stored in the oil storage groove 5111 may be used again to lubricate the differential gear 32 or may be flowed into the oil reservoir P.

An oil guide hole 5112 is provided on the side of the oil reservoir plate 524 and below the contact wall 5100 . The oil guide hole 5112 is connected to the insertion hole 514 . That is, the oil guide hole 5112 guides the oil CL to the insertion hole 514 . The oil CL guided from the oil guide hole 5112 to the insertion hole 514 flows into the second motor bearing holding portion 516 and the first gear bearing holding portion 517, respectively. Then, the second motor bearing 282 and the first gear bearing 341 are lubricated.

Furthermore, as shown in FIG. 16, the side plate portion 512 has a first oil introduction hole 5113 and a second oil introduction hole 5114. As shown in FIG. The first oil introduction hole 5113 is provided above the third gear bearing holding portion 518 and connects the motor housing portion 61 and the gear housing portion 62 . The first oil introduction hole 5113 guides the oil CL in the motor housing portion 61 upward to the third gear bearing holding portion 518 . As a result, the third gear bearing 343 held by the third gear bearing holding portion 518 can be lubricated by supplying the oil CL. The second oil introduction hole 5114 opens inside the third gear bearing holding portion 518 when viewed in the axial direction, and connects the motor housing portion 61 and the gear housing portion 62 . The second oil introduction hole 5114 guides the oil CL in the motor housing portion 61 to the third gear bearing holding portion 518 . As a result, the third gear bearing 343 held by the third gear bearing holding portion 518 can be lubricated by supplying the oil CL.

18 is a perspective view showing the arrangement of the motor oil reservoir 58 and the motor 2. FIG. 19 is a plan view showing the arrangement of the motor oil reservoir 58 and the motor 2. FIG.

As shown in FIGS. 18 and 19, motor oil reservoir 58 is smaller than motor oil reservoir 57 . More specifically, in plan view, the motor oil reservoir 57 is arranged above the motor 2 on both sides of the motor shaft J2, while the motor oil reservoir 58 is arranged on one side of the motor shaft J2. It is a configuration that is placed only in

The motor oil reservoir 58 has a first supply hole 581 and a second supply hole 582 . The first supply hole 581 is arranged above the coil end 271 like the first supply hole 581 of the motor oil reservoir 57 . In addition, the second supply hole 582 is arranged above the first motor bearing holding portion 531 and the second motor bearing holding portion 516 like the second supply hole 582 of the motor oil reservoir 57 .

The oil CL dripped from the first supply hole 581 drips onto the coil end 271 . The coil 27 is cooled by the oil CL dripped onto the coil end 271 .

The oil CL dripping from the second supply hole 582 drips onto the first motor bearing 281 and the second motor bearing 282, and the first motor bearing 281 and the second motor bearing 282 are lubricated with the oil CL.

In addition, since the motor oil reservoir 58 is smaller than the motor oil reservoir 57 , there are fewer restrictions on the mounting location than the motor oil reservoir 57 . Unlike the motor oil reservoir 57, the motor oil reservoir 58 does not have a third supply hole. For example, it can be used in a configuration in which it is not desired to drop the oil CL directly onto the stator core 26 . However, it is not limited to this, and a third supply hole arranged above the stator core 26 may be provided.

The embodiments and modifications of the present invention have been described above, but each configuration and combination thereof in the embodiments are examples, and additions, omissions, replacements, and modifications of configurations can be made without departing from the scope of the present invention. Other modifications are possible. Moreover, the present invention is not limited by the embodiments.

The motor unit of the present invention can be used, for example, as a drive motor for hybrid vehicles (HV), plug-in hybrid vehicles (PHV) and electric vehicles (EV).

1 Motor Unit 2 Motor 21 Rotor 22 Motor Shaft 220 Hollow Part 221 Oil Sprinkling Hole 23 Rotor Core 24 Rotor Magnet 25 Stator 26 Stator Core 261 Magnetic Pole Teeth 27 Coil 271 Coil End 281 First Motor Bearing 282 Second Motor Bearing 3 Gear Part 31 Reduction Gear 311 first gear 312 second gear 313 third gear 314 intermediate shaft 32 differential gear 321 ring gear 33 parking mechanism 331 parking gear 332 rotation blocking portion 333 parking motor 341 first gear bearing 342 second gear bearing 343 third gear bearing 344 Fourth Gear Bearing 4 Pump 41 Pump Motor 411 Stator 412 Rotor 413 Pump Shaft 42 Compression Portion 420 Internal Space 421 Suction Port 422 Discharge Port 43 Pump Case 44 Lid Portion 45 Cooling Fin 46 Strainer 461 Inflow Opening 462 Outflow Portion 5 Housing 51 First First housing member 510 partition wall 5100 contact wall 511 peripheral wall 5110 oil flow groove 5111 oil storage groove 5112 oil guide hole 5113 first oil introduction hole 5114 second oil introduction hole 512 side plate 513 projection 514 insertion hole 515 passage of first drive shaft Hole 516 Second motor bearing holder 517 First gear bearing holder 518 Third gear bearing holder 519 Side plate opening 52 Second housing member 521 Second gear bearing holder 522 Fourth gear bearing holder 523 Second drive shaft passage Hole 524 Oil reserve plate 525 Oil supply hole 526 Oil supply groove 527 Oil guide groove 53 Closing member 531 First motor bearing holding portion 54 Pump housing portion 540 Pump chamber 541 Oil inflow hole 542 Oil outflow hole 543 Storage chamber peripheral wall portion 544 Storage chamber Side wall portion 55 Oil piping portion 551 Supply hole 56 Oil cooler mounting portion 561 Oil supply hole 562 Oil drain hole 563 Coolant supply hole 564 Coolant discharge hole 57 Motor oil reservoir 571 First supply hole 572 Second supply hole 573 Third supply hole 58 Motor Oil reservoir 581 First supply hole 582 Second supply hole 6 Housing space 61 Motor housing 62 Gear housing 7 Inverter unit 71 Refrigerant pipe 8 Oil cooler 80 Fin 81 Oil channel 82 Refrigerant channel 811 Inflow pipe 812 Bypass pipe 813 Outflow Piping CL Oil Ds Drive shaft J2 Motor shaft J4 Intermediate shaft J5 Differential shaft J6 Pump shaft J7 Center shaft P Oil reservoir

Claims (9)

a motor having a motor shaft that rotates about a motor axis extending along a horizontal direction;
a gear portion connected to the motor shaft on one side in the axial direction of the motor shaft;
a housing that accommodates the motor and the gear;
a pump that supplies oil contained in the housing to the motor;
The housing is
a motor accommodating portion that accommodates the motor;
a gear accommodating portion that accommodates the gear portion;
a pump accommodating portion accommodating the pump and forming a pump chamber therein;
an oil inflow hole connecting the gear housing portion and the pump chamber;
an oil pipe connecting the pump chamber and the motor housing,
the pump accommodating portion is vertically below the motor accommodating portion and adjacent to the gear accommodating portion on the other side in the axial direction of the motor shaft;
A motor unit in which the pump sucks the oil in the gear accommodating portion into the pump chamber through the oil inlet and supplies the oil in the pump chamber to the motor in the motor accommodating portion through the oil piping portion. . The housing is
a first housing member provided on the other side in the axial direction of the motor shaft;
2. The motor unit according to claim 1 , further comprising a second housing member provided on one axial side of the motor shaft. The pump is
a pump motor having a pump shaft that rotates about a pump axis;
a compression portion to which the pump shaft is connected on one axial side of the pump shaft;
further having
The compressing section is
a suction port for sucking the oil;
a discharge port for discharging the oil,
3. The motor unit according to claim 1, wherein the suction port has a cylindrical shape that can be inserted into the oil inlet. Oil is stored in the lower part inside the gear housing,
further comprising a strainer disposed inside the gear housing and connected to the oil inlet,
4. A motor unit according to any one of claims 1 to 3, wherein said strainer has an inflow opening on its lower surface. the pump shaft is parallel to the motor shaft;
The pump accommodating portion is
a cylindrical accommodation chamber peripheral wall extending in the axial direction of the motor shaft;
a side wall portion of the accommodation chamber that closes a part of the end portion of the motor shaft on one side in the axial direction;
The oil inflow hole is formed in the side wall of the accommodation chamber,
an oil outflow hole to which the oil pipe is connected is formed in the housing chamber peripheral wall,
4 . The motor unit according to claim 3 , wherein the suction port of the compression portion protrudes in the one axial direction from the end surface of the pump shaft on the one axial side. 6. The motor unit according to claim 5, wherein the center of the oil inlet hole is positioned radially outward and vertically downward of the pump shaft with respect to the pump shaft when viewed from the axial direction of the pump shaft. The pump further has a lid that closes the opening of the pump chamber,
The lid has a plurality of cooling fins arranged on the outer surface,
7. The motor unit according to any one of claims 1 to 6, wherein the plurality of cooling fins extend horizontally and are arranged in a direction intersecting the horizontal direction with a gap between them. An oil cooler for cooling oil passing through the oil pipe is provided in the path of the oil pipe,
8. The motor according to any one of claims 1 to 7, wherein the pump accommodating portion and the oil cooler are arranged above a lower end of the gear accommodating portion of the housing when viewed in the axial direction of the motor shaft. unit. The oil cooler is
an oil flow path through which oil flows;
a refrigerant channel through which the refrigerant flows,
The housing further has an oil cooler mounting portion for mounting the oil cooler,
The oil cooler mounting portion is
an oil supply hole for allowing the oil to flow into the oil flow path;
an oil drain hole into which the oil discharged from the oil flow path flows;
a coolant supply hole for allowing the coolant to flow into the coolant channel;
a coolant discharge hole into which the coolant discharged from the coolant channel flows;
9. A motor unit according to claim 8, wherein a line connecting said oil supply hole and said oil drain hole intersects with a line connecting said coolant supply hole and said coolant discharge hole.

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