TWI814089B - motor unit - Google Patents

Abstract

The motor unit has: a casing having a motor accommodating portion accommodating the motor and a coolant supply portion; and an inverter accommodating portion accommodating the inverter; and a bus bar. The busbar connects the motor to the inverter. The housing has a partition wall portion formed at an axial end of the inverter housing portion and axially separates the inverter housing portion and the motor housing portion, and the housing has a wall portion, The wall portion is disposed between the busbar receiving hole and the coolant supply port at an axial end of the motor receiving portion.

Description

Motor unit

The present invention relates to a motor unit.

Conventionally, a motor unit in which an inverter and a motor are integrated has been known. In addition, there is known an oil-cooled motor unit in which the motor is cooled by lubricating oil that lubricates a gear mechanism. The inverter and the motor are connected via a busbar (for example, refer to Japanese Patent Application Laid-Open No. 2011-234590). Prior art documents

Patent Document Patent Document 1: Japanese Patent Application Laid-Open No. 2011-234590

In the above-mentioned conventional motor unit, the bus bar is disposed so as to pass through a portion between the casing housing the inverter and the casing housing the motor. Therefore, there is a concern that the lubricating oil used to cool the motor is scattered due to the position of the bus bar and flows into the case housing the inverter.

Therefore, the present invention is a motor unit including a motor and an inverter, and its object is to prevent the inverter from coming into contact with a coolant that cools the motor.

An exemplary motor unit of the present invention includes: a motor having a rotor and a stator. The rotor rotates around a motor axis extending in the horizontal direction, and the stator and the rotor are radially opposite to each other with a gap therebetween; an inverter that controls power supplied to the motor; a coolant supply unit that is disposed above the motor and supplies coolant to the motor; and a casing , the housing has a motor housing portion and an inverter housing portion, the motor housing portion houses the motor and the coolant supply portion, the inverter housing portion houses the inverter; and a busbar, The busbar connects the motor to the inverter. The stator has a stator core and a plurality of coils. The coolant supply part has a coolant supply port arranged axially on one side of an axially one end of the stator core part and above the coil. The housing has a partition wall portion formed at an axial end of the inverter accommodating portion and axially dividing the inverter accommodating portion and the motor accommodating portion. separated. A busbar receiving hole is formed in the partition wall portion, and the busbar receiving hole penetrates in the axial direction and receives a part of the busbar. An axial end of the busbar receiving hole is disposed axially between an axial end of the stator core and the coolant supply port. When viewed from the axial direction, at least a part of the busbar receiving hole is disposed below the upper end of the motor. The housing is disposed between the busbar receiving hole and the coolant supply port at an axial end of the motor receiving portion.

According to the exemplary motor unit of the present invention, the motor unit including the motor and the inverter can suppress the contact between the inverter and the coolant that cools the motor.

1: Motor unit

1a: Motor unit

1b: Motor unit

2: Motor

21:Rotor

22:Motor shaft

220: Hollow part

23:Rotor core

24:Stator

25:Stator core

251:End

26: coil

261: Coil wire

262:Terminal

263:End

3: Gear Department

31:Deceleration part

311:First gear

312:Second gear

313:Third gear

314:Intermediate shaft

32: Differential part

321:Ring gear

33:Output shaft

4:Inverter

5: Shell

501: Motor Storage Department

502:Inverter Containment Department

503:Gear Storage Department

51: Shell body

511: Barrel part

5111: concave part

512:Box Department

513:Partition wall

514: Cover mounting rib

515:Flange part

516:Through hole

517: The first output shaft passes through the hole

518:Oil flow hole

52:First cover

521:First Flat Part

522:First leg

53:Second cover

531: Second flat plate part

532:Second leg

54: The third cover

541: The third flat plate part

542:Third leg

543: The second output shaft passes through the hole

544:Oil storage tray

55:Busbar configuration department

551:Busbar configuration concave part

552:Busbar receiving hole

5521:End

5522:End

553: Bottom

56: Wall

5601:First wall

5602:Second wall

561: Upper end

562:lower end

57:Oil storage department

6:Busbar unit

61:Busbar

611:Busbar body

612: Terminal connection part

613: Bending part

62:Busbar holder

621:Retainer body

622: Retainer flange

63:Sealing components

7: Coolant circulation department

71:Piping Department

72:Pump

73:Oil cooler

74: Coolant supply department

741:Pipeline

742: Coolant supply port

743:Retainer

744: Fixed components

51a: Shell body

55a:Busbar configuration department

551a: Bus bar configuration concave part

56a: wall

51b: Shell body

56b: wall

552b:Busbar receiving hole

J2: Motor axis

X, Y, Z: coordinate axes

FIG. 1 is a perspective view viewed from above on one axial side of the motor unit according to one embodiment.

Figure 2 is a schematic diagram of the motor unit.

FIG. 3 is an exploded perspective view of a part of the motor unit.

FIG. 4 is a view of the motor unit with the first cover removed, as viewed from one side in the axial direction.

Fig. 5 is a perspective view of the housing main body.

FIG. 6 is a view of the housing main body in a state in which the first cover part and the busbar unit are removed, viewed from the axial direction side.

7 is a schematic layout diagram showing the axial positions of the motor, the busbar receiving hole, the wall portion, and the coolant supply port.

8 is an axial view of the housing body with the first cover of the motor unit according to the first modified example removed.

FIG. 9 is a schematic layout diagram showing the axial arrangement of each part of the motor unit according to the second modified example.

FIG. 10 is a schematic layout diagram showing the axial arrangement of each part of the motor unit according to another example of the second modification.

Hereinafter, the motor unit according to the embodiment of the present invention will be described with reference to the drawings. In addition, the scope of the present invention is not limited to the following embodiments; Any change within the scope of technical ideas.

Furthermore, in the drawings, the XYZ coordinate system is appropriately expressed as a three-dimensional rectangular coordinate system. That is, in the following description, the XYZ coordinate system is based on the state of FIG. 1 . In more detail, it is defined as follows.

Set the vertical direction as the Z direction. In the motor unit 1, the Z direction is the up-down direction. The X direction and the Y direction are orthogonal to each other and orthogonal to the Z direction respectively. In this specification, the direction parallel to the motor axis J2 of the motor 2 is referred to as the "axial direction" of the motor unit 1 . As shown in Fig. 1 , the axial direction is parallel to the Y direction, and is defined as one axial side N and the other axial side T (see Fig. 1 ). In addition, the radial direction orthogonal to the motor axis J2 is simply called the "radial direction", and the circumferential direction centered on the motor axis J2 is simply called the "circumferential direction".

In addition, in this specification, the "parallel direction" includes not only a completely parallel direction but also a substantially parallel direction. In addition, "extending along" a predetermined direction or a plane includes, in addition to extending strictly along a predetermined direction, also includes extending in a direction that is inclined within a range of less than 45° with respect to the exact direction.

<Motor unit 1>

Hereinafter, the motor unit 1 according to an exemplary embodiment of the present invention will be described based on the drawings. FIG. 1 is a perspective view of the motor unit 1 viewed from above on one side N in the axial direction. FIG. 2 is a schematic diagram of the motor unit 1 according to an embodiment. FIG. 3 is an exploded perspective view of a part of the motor unit 1 . FIG. 4 is a view of the motor unit 1 with the first cover 52 removed as viewed from one side N in the axial direction. In addition, the motor unit 1 illustrated in each figure is a schematic diagram, and the arrangement and dimensions of each part may be different from the actual arrangement and dimensions of the motor unit 1 . In addition, in FIG. 2 , the flow direction of the oil CL is indicated by an arrow line.

As shown in FIGS. 1 to 3 etc., the motor unit 1 includes a motor 2 , a gear unit 3 , an inverter 4 , a housing 5 , a busbar unit 6 and a coolant circulation unit 7 .

<Motor 2>

As shown in FIG. 2 , the motor 2 includes a rotor 21 that rotates about a motor axis J2 extending in the horizontal direction, and a stator 24 that faces the rotor 21 with a gap in the radial direction. More specifically, the motor 2 is a so-called inner rotor type motor in which the rotor 21 is arranged radially inside the stator 24 . The motor 2 is accommodated in a motor accommodating portion 501 of the housing 5 which will be described later.

<Rotor 21>

The rotor 21 rotates by supplying electric power to the stator 24 . The rotor 21 has a motor shaft 22, a rotor core 23, and a rotor magnet (not shown).

The motor shaft 22 extends around a motor axis J2 extending in the horizontal and axial directions. The motor shaft 22 rotates around the motor axis J2. The motor shaft 22 is a hollow shaft with a hollow portion 220 provided therein, and the hollow portion 220 has an inner peripheral surface extending along the motor axis J2.

The motor shaft 22 extends across the motor receiving portion 501 and the gear receiving portion 503 of the housing 5 . The motor rotating shaft 22 extends from the motor receiving portion 501 toward the other axial side T and protrudes toward the gear receiving portion 503 side. A first gear 311 (described later) of the gear portion 3 is fixed to the end of the motor shaft 22 protruding into the gear housing portion 503 . The motor shaft 22 is rotatably supported by the housing 5 via bearings.

In addition, the motor shaft 22 can also be divided. When the motor rotating shaft 22 can be divided, the divided motor rotating shaft 22 can be coupled using spline fitting, for example. Thread couplings of male and female threads, etc. are used. In addition, they can also be joined by fixing methods such as welding.

The rotor core 23 is formed by laminating silicon steel plates, for example. The rotor core 23 is a cylinder extending in the axial direction. A plurality of rotor magnets are fixed to the rotor core 23 . The plurality of rotor magnets are arranged in an arrangement such that magnetic poles appear alternately in the circumferential direction.

<Stator 24>

The stator 24 surrounds the rotor 21 from the radially outer side. The stator 24 is held in the housing 5 .

The stator 24 has a stator core 25 , a plurality of coils 26 , and an insulator (not shown) sandwiched between the stator core 25 and the coils 26 . That is, the stator 24 has a stator core 25 and a plurality of coils 26 . The stator core 25 has a plurality of magnetic pole teeth protruding radially inward from the inner peripheral surface of the annular yoke. The coil 26 is formed by winding a conductor around magnetic pole teeth. The coil 26 is electrically connected to the inverter 4 via a bus bar 61 to be described later.

<Gear part 3>

The gear unit 3 has a plurality of gears and is accommodated in the gear receiving portion 503 of the housing 5 . The gear portion 3 is connected to the motor shaft 22 on the other side T in the axial direction. The gear unit 3 has a reduction unit 31 and a differential unit 32 .

<Deceleration part 31>

As shown in FIG. 2 , the reduction part 31 is connected to the motor shaft 22 . The reduction unit 31 transmits the torque output from the motor 2 to the differential unit 32 . The reduction unit 31 reduces the rotational speed of the motor 2 and increases the torque output from the motor 2 in accordance with the reduction ratio.

The reduction unit 31 is a parallel-axis gear reduction gearbox in which the axes of each gear are arranged in parallel. The reduction unit 31 has: a first gear 311 as an intermediate drive gear; The second gear 312 of the intermediate gear; the third gear 313 as the final drive gear; and the intermediate rotating shaft 314.

The first gear 311 is arranged on the outer peripheral surface of the motor shaft 22 . The first gear 311 rotates together with the motor shaft 22 about the motor axis J2. The intermediate rotating shaft 314 extends along an intermediate axis J4 parallel to the motor axis J2. The intermediate rotating shaft 314 is rotatably supported by a flange portion 515 and a third cover portion 54 of the housing 5 described later via bearings.

The intermediate rotating shaft 314 can rotate about the intermediate axis J4. The second gear 312 and the third gear 313 are arranged on the intermediate rotating shaft 314 . The second gear 312 meshes with the first gear 311 . The third gear 313 meshes with the ring gear 321 of the differential portion 32 . The torque of the motor shaft 22 is transmitted from the first gear 311 to the second gear 312 . Then, the torque transmitted to the second gear 312 is transmitted to the third gear 313 via the intermediate rotating shaft 314 . The torque transmitted to the third gear 313 is transmitted to the ring gear 321 of the differential portion 32 . In this way, the reduction unit 31 transmits the torque output from the motor 2 to the differential unit 32 . The gear ratio of each gear and the number of gears can be variously changed according to the required reduction ratio.

<Differential section 32>

The differential portion 32 transmits the torque output from the motor 2 to the output shaft 33 . The output rotating shafts 33 are respectively installed on the left and right sides of the differential portion 32 . For example, the differential portion 32 has a function of absorbing the speed difference between the left and right drive wheels, that is, the output shaft 33 when the vehicle rotates, and transmitting the same torque to the left and right output shafts 33 . The output shaft 33 passes through the first output shaft insertion hole 517 formed in the flange portion 515 and the second output shaft insertion hole 543 formed in the third cover portion 54 . The output shaft 33 is connected to a drive shaft (not shown) connected to a drive wheel of the vehicle.

<Inverter 4>

The inverter 4 is electrically connected to the motor 2 . The inverter 4 controls the electric power supplied to the motor 2 . More specifically, the inverter 4 controls the electric power supplied to the motor 2 from a power source such as a battery (not shown). The inverter 4 includes: an IGBT circuit section (not shown) including an IGBT as a rectifying element; and a smoothing circuit section (not shown) including a circuit for converting the rectified a capacitor for current smoothing; and a controller unit (not shown) that controls the IGBT of the IGBT circuit unit. That is, the inverter 4 has an electrical circuit and an electronic circuit. The inverter 4 is arranged inside an inverter housing portion 502 of the housing 5 which will be described later. The inverter housing portion 502 has a structure that prevents the intrusion of foreign matter such as water, dust, and oil, which will be described in detail later.

<Shell 5>

FIG. 5 is a perspective view of the housing main body 51 . In FIG. 5 , the busbar unit 6 is shown detached from the housing body 51 .

As shown in FIGS. 2 , 3 , etc., the housing 5 has a housing body 51 , a first cover 52 , a second cover 53 , and a third cover 54 . The casing 5 is made of metal such as iron, aluminum, or an alloy of iron and aluminum, for example, but is not limited thereto. The housing 5 has a motor housing portion 501 that houses the motor 2 and the coolant supply portion 74 , and an inverter housing portion 502 that houses the inverter 4 . Furthermore, the housing 5 has a gear accommodating portion 503 for accommodating the gear portion 3 . The gear housing portion 503 is arranged on the other side T in the axial direction of the motor housing portion 501 . That is, the housing 5 has the gear housing 503 that houses a plurality of gears on the other side T in the axial direction of the motor housing 501 .

<Casing body 51>

As shown in FIGS. 3 and 5 , the housing main body 51 has a cylindrical portion 511 , a box portion 512 , a partition wall portion 513 , a cover mounting rib 514 and a flange portion 515 . The cylindrical portion 511 has a cylindrical shape extending in the axial direction. The cylindrical portion 511 opens toward one side N in the axial direction. The opening of the tube part 511 is blocked by the first cover part 52 . The center line of the barrel portion 511 overlaps the motor axis J2. A recessed portion 5111 that is recessed upward is formed at the upper end of the internal space of the cylindrical portion 511 . The recessed portion 5111 accommodates a coolant supply portion 74 of the coolant circulation portion 7 described later.

The box portion 512 and the tube portion 511 are adjacent to each other in the X direction. The box portion 512 and the cylinder portion 511 of the housing main body 51 are formed of a single member. The upper part of the box part 512 is open. The upper opening of the box part 512 is blocked by the second cover part 53 . In addition, a part of the box part 512 is closed by the outer peripheral wall of the cylindrical part 511. In other words, the outer peripheral wall of the cylindrical part 511 isolates the inside of the cylindrical part 511 from the inside of the box part 512 . In addition, when viewed in the axial direction, the upper surface of the box portion 512 is formed in an inclined shape downward toward the distance from the cylindrical portion 511 . However, it is not limited to this and may be horizontal or approximately horizontal.

The partition wall portion 513 is a portion of the side wall on the axial side N of the box portion 512 on the cylindrical portion 511 side, and is connected to the end of the axial side N of the cylindrical portion 511 . In other words, the partition wall portion 513 expands in the radial direction from the end portion on the axial side N of the cylindrical portion 511 . The partition wall portion 513 is formed with a bus bar arrangement portion 55 and a wall portion 56 . The details of the bus bar arrangement part 55 and the wall part 56 will be described later.

The cover attachment rib 514 is a rib that protrudes toward the axial side N from the outer peripheral portion of a portion connecting the end surface of the cylindrical portion 511 on the axial side N and the end surface of the partition wall portion 513 on the axial side N. . The end surface of the cover mounting rib 514 on the axial side N is disposed in a plane orthogonal to the motor axis J2. On the axial side N of the cover mounting rib 514 The first cover 52 is fixed on the end surface.

The flange portion 515 is arranged on the other axial side T of the housing body 51 . The flange portion 515 has a flat plate shape orthogonal to the motor axis J2. The flange portion 515 expands radially inward and outward from the end portion on the other axial side T of the tube portion 511 . That is, the end portion on the other side T in the axial direction of the tube portion 511 is closed by the flange portion 515 . The flange portion 515 has a through hole 516 formed in the center of the barrel portion 511 when viewed from the axial direction, and through which the motor shaft 22 passes (see FIG. 2 ). In addition, the motor shaft 22 is rotatably supported by the flange portion 515 via a bearing.

The flange portion 515 is a part of the side wall on the other axial side T of the box portion 512 . The flange portion 515 is a flat plate perpendicular to the axial direction, and extends downwardly from the lower end portion of the box portion 512 . A first output shaft insertion hole 517 is formed in a portion of the flange portion 515 that expands downward (see FIG. 2 ). The output shaft 33 is rotatably arranged in the first output shaft insertion hole 517 (see FIG. 2 ).

In addition, a pump 72 is attached in the axial direction below the cylindrical portion 511 and the box portion 512 on the axial side N surface of the flange portion 515 (see FIG. 4 and the like). The pump 72 is a part of the coolant circulation part 7 and lifts the oil accumulated in the oil storage part 57 described below in the lower part of the gear accommodating part 503 . Details of the pump 72 will be described later.

<First cover part 52>

As shown in FIGS. 2 and 3 , the first cover part 52 has a first flat plate part 521 and a first leg part 522 . The first cover 52 is mounted on the end of the cover mounting rib 514 on one side N in the axial direction. The first flat plate portion 521 expands in a direction orthogonal to the axial direction. The first leg portion 522 extends toward the other axial side T from the outer edge portion of the first flat plate portion 521 in the direction orthogonal to the axial direction. The first leg portion 522 is formed in an annular shape.

The first leg portion 522 contacts the cover mounting rib 514 in the axial direction. In addition, the first leg portion 522 is in contact with and in close contact with the cover mounting rib 514 . Here, close contact refers to sealing performance to such an extent that the oil circulated through the coolant circulation unit 7 does not leak to the outside and foreign matter such as water, dust, dust, etc. from the outside does not invade. The following is set to the same structure.

By attaching the first cover part 52 to the cover attaching rib 514, the portion surrounded by the cylindrical part 511, the partition wall part 513, the cover attaching rib 514, the flange part 515 and the first cover part 52 becomes a motor. Containment Department 501. The motor 2 is accommodated inside the motor accommodation part 501 . Specifically, the motor 2 is disposed inside the cylinder portion 511 .

At this time, the other axial side T of the motor shaft 22 is arranged to penetrate the through hole 516 (see FIG. 2 ). Furthermore, by attaching the first cover 52 to the cover attachment rib 514 , the motor 2 is accommodated in the motor housing 501 . When the motor 2 is accommodated in the motor housing portion 501 , the end portion on the axial side N of the motor shaft 22 is rotatably supported by the first flat plate portion 521 of the first cover portion 52 via a bearing.

<Second cover part 53>

The second cover part 53 has a second flat plate part 531 and a second leg part 532 . The second leg portion 532 of the second cover portion 53 is brought into contact with the upper surface of the box portion 512 . Thereby, the second cover part 53 is attached to the upper part of the box part 512. The second leg portion 532 extends downward from the outer edge portion of the second flat plate portion 531 in the direction orthogonal to the Z direction. The lower end surface of the second leg portion 532 in the Z direction is an inclined surface that faces downward as it moves away from the cylindrical portion 511 when viewed from the axial direction.

The lower end of the second leg portion 532 is brought into contact with the upper surface of the box portion 512 and the When the second cover part 53 is attached to the box part 512, the second flat plate part 531 of the second cover part 53 is a flat plate that expands in a direction orthogonal to the Z direction.

By attaching the second cover part 53 to the upper part of the box part 512 , the portion surrounded by the box part 512 , the partition wall part 513 , the flange part 515 and the second cover part 53 becomes the inverter housing part 502 . The inverter 4 is accommodated inside the inverter accommodation part 502 . In addition, the lower end of the second leg portion 532 is in close contact with the upper surface of the box portion 512 . Therefore, foreign matter such as oil, water, dust, etc. can be suppressed from intruding into the inside of the inverter accommodating portion 502 from the joint portion of the second cover portion 53 and the box portion 512 .

A partition wall portion 513 is arranged between the space surrounded by the cover mounting rib 514 and the first cover portion 52 of the motor housing portion 501 and the inverter housing portion 502 . That is, the housing 5 has a partition wall portion 513 formed at an end portion on the axial side N of the inverter housing portion 502 and axially partitioning the inverter housing portion 502 and the motor housing portion 501 . open. In addition, the partition wall portion 513 is also a part of the motor housing portion 501 .

<Third cover part 54>

The third cover part 54 has a third flat plate part 541 and a third leg part 542 . The third cover part 54 is attached to the other axial side T of the flange part 515 . The third flat plate portion 541 expands in a direction orthogonal to the axial direction. The third leg portion 542 extends toward the axial direction side N from the outer edge portion of the third flat plate portion 541 in the direction orthogonal to the axial direction. The third leg 542 is ring-shaped.

The third cover part 54 is attached to the end surface of the flange part 515 on the other axial side T. The motor shaft 22 protrudes toward the other axial side T from the through hole 516 of the flange portion 515 . The third cover portion 54 covers the portion of the motor shaft 22 that is closer to the other axial side T in the axial direction than the flange portion 515 . At this time, the end of the motor shaft 22 on the other axial side T is rotatable via the bearing. The inner surface of the third flat plate portion 541 is supported on the third cover portion 54 .

The end surface of the third leg portion 542 of the third cover portion 54 on one axial side N is in close contact with the end surface of the flange portion 515 on the other axial side T. Thereby, a space surrounded by the flange portion 515 and the third cover portion 54 is formed on the other axial side T of the flange portion 515 . The space surrounded by the flange part 515 and the third cover part 54 is the gear receiving part 503. The first gear 311 , the second gear 312 , the third gear 313 and the ring gear 321 are accommodated inside the gear accommodating part 503 .

As shown in FIG. 2 , the end of the motor shaft 22 on one axial side N is rotatably supported on the first flat plate portion 521 of the first cover 52 via a bearing, and the end of the motor shaft 22 on the other axial side T is rotatable. The third flat plate portion 541 of the third cover portion 54 is rotatably supported via a bearing, and the middle portion of the motor shaft 22 is rotatably supported by the flange portion 515 via a bearing. In this way, the axial middle portion of the motor rotating shaft 22 is supported via the bearing, thereby suppressing deflection of the motor rotating shaft 22 during rotation.

A first output shaft insertion hole 517 is formed in a lower portion of the through hole 516 of the flange portion 515 . A second output shaft insertion hole 543 is formed in the third flat plate portion 541 . The output rotation shaft 33 penetrates from the first output rotation shaft insertion hole 517 and the second output rotation shaft insertion hole 543 to the outside.

Oil CL used for lubrication of gears and bearings, for example, is stored in the lower part of the gear accommodating part 503 . That is, the lower part of the gear housing part 503 is the oil storage part 57. In detail, the portion surrounded by the third flat plate portion 541 , the third leg portion 542 and the flange portion 515 of the third cover portion 54 is larger than the first output rotation shaft passing hole 517 and the second output rotation shaft passing hole 543 . The oil storage portion 57 is located on the lower side. The flange portion 515 has an oil flow The oil flow hole 518 allows the oil CL to flow back from the motor receiving portion 501 to the gear receiving portion 503 .

<Busbar unit 6>

The inverter 4 and the coil 26 of the motor 2 are electrically connected via the bus bar 61 of the bus bar unit 6 . That is, the bus bar 61 connects the motor 2 and the inverter 4 . As shown in FIG. 5 , the busbar unit 6 has three busbars 61 , a busbar holder 62 and a sealing member 63 . The bus bar 61 has electrical conductivity. The bus bar 61 is attached to the bus bar arrangement part 55 provided in the partition wall part 513 of the housing body 51 via the bus bar holder 62 .

The motor 2 is, for example, a DC brushless motor. U-phase current, V-phase current, and W-phase current having different phases are supplied to the coil 26 of the motor 2 . Therefore, each of the three bus bars 61 is connected to three coil wires 261 respectively. In addition, the three bus bars 61 are respectively connected to terminals (not shown) for outputting U-phase current, V-phase current, and W-phase current from the inverter 4 .

The bus bar 61 has a bus bar main body 611 and a terminal connection part 612. The busbar main body 611 is a plate-shaped conductor extending in the axial direction. The end of the busbar main body 611 on one side N in the axial direction is provided with a bent portion 613 bent in the plate thickness direction. The terminal connecting portion 612 has a cylindrical shape protruding toward the axial side N from the bent portion 613 . The terminal connection part 612 is electrically connected to the terminal 262 mounted on the end of the coil wire 261 . Examples of the connection between the terminal connection portion 612 and the terminal 262 include screw fastening, soldering, etc., but the invention is not limited thereto, and any method that can ensure reliable electrical connection can be widely used.

The bus bar holder 62 is formed of an insulating material such as resin. However, it is not limited to this, and as long as it is an insulating material, it is not limited to resin. busbar The retainer 62 has a retainer body 621 and a retainer flange 622 .

The holder main body 621 has a square prism shape extending in the axial direction. The holder main body 621 is inserted into the busbar receiving hole 552 included in the busbar arrangement part 55 which will be described later. A quadrangular columnar hole is provided inside the holder body 621 . The busbar bodies 611 of the three busbars 61 are arranged side by side in the longitudinal direction of the hole of the holder body 621 .

The retainer flange 622 is located at an end of the axial side N of the retainer body 621 . The holder flange 622 expands from the outer peripheral surface of the end portion on the axial side N of the holder body 621 in a direction orthogonal to the axial direction. The holder flange 622 is formed all around the holder body 621 . In addition, when viewed from the axial direction, the holder flange 622 has a rectangular shape (see FIG. 4 and the like).

For example, an adhesive is injected between the inner peripheral surface of the holder body 621 and the busbar body 611 . The adhesive fixes the busbar body 611 to the holder body 621 and blocks and seals the gap between the inner peripheral surface of the holder body 621 and the busbar body 611 . The busbar main body 611 protrudes toward the other axial side T from an end portion of the holder main body 621 on one axial side N. In addition, a bent portion 613 and a terminal connecting portion 612 protruding from the bent portion 613 are arranged side by side at the end portion on the other axial side T of the holder body 621 . In addition, the three bus bars 61 are held by the bus bar holder 62 in a state of being electrically insulated from each other.

As shown in FIG. 5 , the holder body 621 of the busbar holder 62 is provided with an annular sealing member 63 that is arranged to be in contact with the outer peripheral surface. The sealing member 63 is formed of an elastically deformable material such as rubber or silicone. When the holder body 621 is inserted into the bus bar receiving hole 552, the sealing member 63 is arranged on the outer periphery of the holder body 621. between the surface and the inner peripheral surface of the busbar receiving hole 552, thereby sealing the busbar receiving hole 552. That is, the sealing member 63 is provided in the busbar receiving hole 552 .

In addition, an O-ring made of rubber, silicone, or the like can be used as the sealing member 63, but it is not limited thereto. The sealing member 63 may be disposed between the holder flange 622 and the bus bar arrangement recessed portion 551 of the bus bar arrangement portion 55 to perform sealing. In addition, when sealing can be performed by the busbar holder 62, the sealing member 63 may be omitted.

<Bus bar arrangement part 55 and wall part 56>

The busbar arrangement part 55 and the wall part 56 are formed in the partition wall part 513.

<Busbar Arrangement Section 55>

The busbar arrangement part 55 has a busbar arrangement recessed part 551 and a busbar receiving hole 552. The bus bar arrangement recessed portion 551 is a recessed portion that is recessed from the end surface of the partition wall portion 513 on one axial side N toward the other axial side T. The axial bottom surface 553 of the bus bar arrangement recess 551 is offset toward the other axial side T from the end portion of the partition portion 513 on one axial side N.

A part of the bus bar arrangement recessed portion 551 is connected to the internal space of the cylindrical portion 511 . By forming in this way, when the busbar unit 6 is mounted on the busbar arrangement part 55, a part of the housing 5 is not arrange|positioned between the terminal connection part 612 and the cylindrical part 511. Thereby, the terminal 262 connected to the end part of the coil wire 261 and the terminal connection part 612 can be easily connected.

The busbar receiving hole 552 is a through hole that penetrates the partition wall portion 513 in the axial direction. The busbar receiving hole 552 is a rectangular through hole when viewed from the axial direction. The axial side N of the bus bar receiving hole 552 opens at the axial bottom surface 553 of the bus bar arrangement recess 551 .

The busbar arrangement part 55 is used for arranging the busbar unit 6 . The holder body 621 of the busbar holder 62 is received in the busbar receiving hole 552 . The sealing member 63 is arranged between the outer peripheral surface of the holder body 621 of the busbar holder 62 and the inner peripheral surface of the busbar receiving hole 552 .

In addition, when the bus bar unit 6 is arranged in the bus bar arrangement part 55, the holder flange 622 is fixed to the bus bar arrangement recessed part 551. Fixing of the holder flange 622 to the bus bar arrangement recessed portion 551 can be, for example, screwed, but is not limited thereto. For example, methods for firmly fixing the busbar unit 6 to the busbar arrangement portion 55 such as bonding with an adhesive, potting, and press-fitting can be widely used.

The holder flange 622 of the busbar holder 62 is arranged in the busbar arrangement recess 551 . By bringing the surface on the other axial side T of the holder flange 622 into contact with the bottom surface 553 of the bus bar placement recess 551 , the bus bar unit 6 is positioned in the axial direction relative to the partition wall portion 513 . Furthermore, the outer peripheral surface of the holder flange 622 is in contact with the inner peripheral surface of the bus bar arrangement recess 551 . This completes the radial and circumferential positioning of the busbar unit 6 .

By arranging the bus bar unit 6 in the bus bar arrangement part 55 , a part of the bus bar 61 is arranged in the bus bar receiving hole 552 . In addition, the end portion on the other axial side T of the bus bar 61 penetrates the partition wall portion 513 and protrudes toward the inside of the inverter housing portion 502 . That is, the partition wall portion 513 is formed with a busbar receiving hole 552 that penetrates in the axial direction and accommodates a part of the busbar 61 .

The busbar receiving hole 552 is formed in the partition wall portion 513 arranged on one side N in the axial direction of the housing body 51 . Thereby, the coil wire 261 connecting the bus bar 61 and the coil 26 can be threaded at the end of the housing 5 opposite to the gear housing portion 503 . Therefore, the coil wire 261 is less likely to interfere when the gear unit 3 is assembled. Furthermore, when the motor unit 1 is driven, contact between the coil wire 261 and the gear portion 3 can be suppressed.

<Wall part 56>

In the housing 5 of this embodiment, the wall portion 56 protrudes toward the axial side N from the end portion of the partition wall portion 513 on the axial side N. That is, the wall portion 56 and the partition wall portion 513 are formed of a single member. However, the wall portion 56 is not limited to this, and the wall portion 56 only needs to be connected to the partition wall portion 513 . The wall portion 56 may be formed of a different member from the partition wall portion 513 and fixed to the partition wall portion 513 .

In addition, the wall portion 56 may have the rib 514 attached to the cover portion, or may not be connected. In the housing 5 of this embodiment, the wall portion 56 is connected to the cover mounting rib 514 . Wall 56 and cover mounting rib 514 may also be formed from a single member. In addition, the wall portion 56 formed of a different member from the partition wall portion 513 may be attached to the partition wall portion 513 to connect the wall portion 56 to the lid attachment rib 514 .

Details of the positions of the busbar receiving hole 552 and the wall portion 56 in the housing 5 will be described later.

<Coolant circulation>

The inside of the housing 5 of the motor unit 1 is filled with oil CL for lubricating each gear and the bearing of the gear unit 3 . In the motor unit 1 , the oil is also used for the cooling of the motor 2 . That is, the oil CL for lubricating the motor unit 1 is the coolant for cooling the motor.

As shown in FIG. 2 , an oil reservoir 57 for storing oil CL is provided in a lower region of the gear housing 503 . A part of the differential portion 32 is immersed in the oil reservoir 57 . The oil CL accumulated in the oil storage portion 57 is lifted up by the operation of the differential portion 32 and spreads. scattered to the inside of the gear receiving portion 503 . The oil diffused into the gear housing 503 is supplied to each gear arranged inside the gear housing 503 for lubrication. In addition, part of the oil CL diffused in the gear housing portion 503 is also supplied to each bearing for lubrication.

An oil reservoir 544 is arranged in the gear housing portion 503 . The oil storage pan 544 opens upward. The oil CL lifted up from the oil storage portion 57 moves upwards of the gear accommodating portion 503 and flows into the oil storage pan 544 .

The oil CL accumulated in the oil pan 544 flows from the end on the other axial side T of the motor rotating shaft 22 into the hollow portion 220 of the motor rotating shaft 22 via an oil supply path (not shown). The oil CL in the hollow portion 220 of the motor shaft 22 flows to the motor 2 . The oil CL flowing in the hollow portion 220 is spread toward the stator 24 . The stator 24 is cooled by the oil CL.

<Coolant circulation unit 7>

Furthermore, the motor unit 1 is provided with a coolant circulation unit 7 that circulates the oil CL. The coolant circulation unit 7 includes a pump 72 , a piping unit 71 , an oil cooler 73 and a coolant supply unit 74 .

As shown in FIG. 2 , the piping portion 71 is a piping formed inside the housing body 51 . The piping portion 71 is connected to the coolant supply portion 74 arranged in the recessed portion 5111 of the cylindrical portion 511 . The piping section 71 connects the pump 72 to the coolant supply section 74 and supplies the oil CL to the coolant supply section 74 .

An oil cooler 73 is arranged between the pump 72 of the piping section 71 and the coolant supply section 74 . That is, the oil CL sucked by the pump 72 from the oil reservoir 57 passes through the oil cooler 73 via the piping portion 71 and is sent to the coolant supply portion 74 .

The pump 72 circulates the oil CL accommodated in the housing 5 . The oil CL circulated by the pump 72 is supplied to the motor 2 . Motor 2 is cooled by oil CL. Pump 72 is an electric pump.

As shown in FIGS. 2 and 4 , the pump 72 is attached to the flange portion 515 . As shown in FIG. 2 , the suction port of the pump 72 is connected to the oil reservoir 57 . In addition, the discharge port of the pump 72 is connected to the oil cooler 73 via the piping portion 71 . The oil CL discharged from the pump 72 is sent to the oil cooler 73 .

The oil cooler 73 performs heat exchange between the oil CL and the cooling water supplied from a path different from the oil CL to cool the oil CL. An oil flow tube portion and a refrigerant flow tube portion, both of which are not shown, are arranged inside the oil cooler 73 . The oil flow pipe part and the refrigerant flow pipe part are separated by materials with high thermal conductivity such as aluminum and copper to allow heat exchange between the oil and the refrigerant.

The discharge portion of the oil CL of the oil cooler 73 is connected to the coolant supply portion 74 via the piping portion 71 . The oil CL cooled by the oil cooler 73 is sent to the coolant supply part 74 .

The coolant supply part 74 is arranged in the recessed part 5111 formed in the upper part inside the cylindrical part 511 of the housing body 51 . The motor 2 is arranged inside the tube portion 511 . Therefore, the coolant supply part 74 is arranged vertically above the motor 2 . That is, the coolant supply part 74 is disposed above the motor 2 and supplies the coolant to the motor 2 .

The coolant supply part 74 has a pipe 741, a coolant supply port 742, a holder 743, and a fixing member 744. The coolant supply part 74 has two pipes 741. The two pipes 741 are surrounded by the cylindrical portion 511 on the axial side N of the flange portion 515 The portion extends along the axial direction toward the axial side N. The other end T in the axial direction of the pipe 741 is connected to the piping portion 71 . The end of the axial side N of the pipe 741 is closed. In addition, in the coolant supply part 74 of this embodiment, the number of pipes 741 is two. However, the number of pipes 741 is not limited to this. The number of pipes 741 may be one pipe or three or more pipes.

The coolant supply unit 74 uses a pipe 741 to supply oil CL as the coolant. By using the pipe 741, a pressure above a certain level can be applied to the oil CL in the pipe 741. By discharging the oil CL to which such pressure is applied from the coolant supply port 742, a large amount of oil CL can be diffused and discharged.

The coolant supply port 742 is a through hole penetrating the inner and outer surfaces of the pipe 741 . The position of the coolant supply port 742 supplies oil CL to the heat-generating coil 26 and the stator core 25 of the motor 2 . The coolant supply port 742 on the axial side N is disposed above the coil 26 in a portion protruding toward the axial side N from the stator core 25 . The oil CL is supplied to the coil 26 by discharging the oil CL from the coolant supply port 742 . That is, the coolant supply part 74 has a coolant supply port 742 disposed on the axial side N relative to the end of the stator core 25 on the axial side N and above the coil 26 . In addition, the opening for discharging the oil CL may be provided on the other axial side T and the axial intermediate portion.

The oil supplied from the coolant supply port 742 serves as coolant to cool the motor 2 . Therefore, the coolant supply port 742 is provided in the lower part of the pipe 741 . In addition, the coolant supply port 742 is not limited to the lower part of the pipe 741.

The holder 743 holds the end of the pipe 741 on one side N in the axial direction. The retaining member 743 is a plate-shaped member, and the retaining member 743 is fixed to the The end of the axial side N of the pipe 741. In addition, the holder 743 is fixed to the end of the wall portion 56 on one side N in the axial direction via the fixing member 744 . In addition, the holder 743 is fixed to the end of the axial side N of the cylindrical portion 511 via the fixing member 744 . Thereby, the pipe 741 is held by the wall part 56 via the holder 743. That is, the coolant supply part 74 is held by the wall part 56.

Thereby, the wall portion 56 can play two roles of fixing the coolant supply portion 74 and suppressing the flow of the oil CL into the busbar receiving hole 552 , which will be described later, thereby reducing the number of components of the motor unit 1 .

The wall portion 56 and the housing body 51 are formed as a single member. Therefore, the pipe 741 of the coolant supply part 74 is stably fixed to the housing body 51 , that is, the housing 5 . Accordingly, the oil CL discharged from the coolant supply port 742 can also be supplied to the axial side N of the coil 26 with high accuracy.

In addition, the end portion of the pipe 741 of the coolant supply portion 74 on the axial direction side N is fixed to the end portion of the wall portion 56 on the axial direction side N via the holder 743 and the fixing member 744 . That is, the coolant supply part 74 is held at the end of the wall part 56 on one side N in the axial direction. Thereby, vibration of the coolant supply part 74 caused by driving the motor 2 can be suppressed, and the oil CL discharged from the coolant supply port 742 can be supplied to the axial side N of the coil 26 with high precision.

The end portion on the axial side N of the wall portion 56 is disposed in a portion surrounded by the partition wall portion 513 , the cover attachment rib 514 , and the first cover portion 52 . As described above, the end portion on one side N in the axial direction of the motor shaft 22 is rotatably supported by the first flat plate portion 521 via the bearing. Accordingly, the end portion on the axial side N of the wall portion 56 is disposed farther in the axial direction than the motor shaft 22 . The end of one side N is axially toward the other side T. That is, the protruding length of the wall portion 56 toward the axial side N is suppressed within a certain range.

This can prevent the axial length of the housing 5 from being increased due to the presence of the wall portion 56 . In addition, the wall portion 56 can also play two roles of fixing the coolant supply portion 74 and suppressing the flow of the oil CL into the busbar receiving hole 552, which will be described later.

The fixation of the pipe 741 is not limited to the wall part 56. For example, the end part on the other axial side T of the pipe 741 may be fixed to the flange part 515. Accordingly, the end of the pipe 741 on one axial side N is fixed to the wall portion 56 and the end of the other axial side T is fixed to the flange portion 515 . Therefore, the pipe 741 can be fixed to the wall portion 56 in a more stable state. Shell 5. Thereby, the effect of suppressing the vibration of the pipe 741 can be further improved.

Here, the fixing member 744 is a screw. The retainer 743 is threaded fast using the fixing member 744. Alternatively, a cylindrical body penetrating in the axial direction may be used as the pipe 741, and the fixing member 744 may be screwed into the inner surface of the end of the pipe 741 on the axial side N, thereby fixing the end of the pipe 741 on the axial side N. Partially closed. Alternatively, a bottomed cylinder with the end on the axial side N closed in advance may be used, and the end on the axial side N may be fixed to the holder 743 by the fixing member 744 . In addition to screws, a structure capable of firmly fixing the holder 743 to the pipe 741, the wall portion 56, and the axial side N of the tube portion 511 can be widely used as the fixing member 744.

By closing the axial side N of the pipe 741 , the oil CL flowing into the pipe 741 can be supplied to the motor 2 from the coolant supply port 742 . In addition, the pressure of the oil CL flowing into the inside of the pipe 741 can be set to a certain level or higher. Thereby, the pressurized oil CL can be discharged from the coolant supply port 742 . Thereby, the oil CL can be blown to the wider area of the motor 2 Scope.

In addition, the pipe 741 of the coolant supply part 74 may be replaced with a container-shaped member having an upper opening and a hole for dripping oil at an appropriate location on the bottom.

<Arrangement of busbar receiving hole 552 and wall portion 56>

The relative positions of the busbar receiving hole 552 and the wall portion 56 in the housing body 51 will be described with reference to the drawings. FIG. 6 is a diagram of the housing main body 51 in a state in which the first cover 52 and the bus bar unit 6 are removed, viewed from the axial side N in the axial direction. FIG. 7 is a schematic layout diagram showing the axial positions of the motor 2 , the busbar receiving hole 552 , the wall portion 56 , and the coolant supply port 742 .

As shown in FIG. 7 , a coolant supply port 742 is formed at an end of the axial side N of the pipe 741 . Furthermore, the coolant supply port 742 is disposed above the coil 26 protruding from the stator core 25 toward the axial side N rather than the end portion on the axial side N. In addition, the end 5521 (indicated by Y1 ) of the busbar receiving hole 552 on the axial side N is disposed axially closer to the axial side N than the end 251 of the stator core 25 on the axial side N. In addition, the end portion 5521 of the busbar receiving hole 552 on the axial side N is disposed axially closer to the other axial side T than the coolant supply port 742 . That is, the end portion 5521 of the bus bar receiving hole 552 on the axial side N is disposed in the axial direction between the end portion 251 of the stator core 25 on the axial side N and the coolant supply port 742 .

In addition, when viewed from the axial direction, the busbar receiving hole 552 is disposed below the upper end (indicated by Z1 ) of the motor 2 . That is, when viewed from the axial direction, at least part of the bus bar receiving hole 552 is disposed below the upper end of the motor 2 . Thereby, the height of the motor unit 1 can be kept low. That is, the motor unit 1 can be made flat.

Furthermore, the wall portion 56 protrudes in the axial direction from the end surface on the axial side N of the partition wall portion 513 . Furthermore, as shown in FIG. 6 , the wall portion 56 is disposed in the circumferential direction between the bus bar receiving hole 552 and the coolant supply port 742 formed at the end of the axial side N of the duct 741 . That is, the housing 5 has the wall portion 56 disposed at the end on the axial side N of the motor housing portion 501 , and the wall portion 56 is disposed between the busbar housing hole 552 and the coolant supply port 742 .

Furthermore, the upper end 561 of the wall portion 56 is disposed above the coolant supply port 742 . In addition, the lower end 562 (indicated by Z2 ) of the wall portion 56 is arranged below the coolant supply port 742 . As shown in FIG. 7 , the end portion on the axial side N of the wall portion 56 is disposed closer to the axial side N than the coolant supply port 742 .

The presence of the wall portion 56 between the coolant supply port 742 and the busbar receiving hole 552 can prevent the oil CL blown out from the coolant supply port 742 from being directly applied to the busbar receiving hole 552 . In addition, the upper end 561 of the wall portion 56 is located above the coolant supply port 742 , and the lower end 562 is located below the coolant supply port 742 . This can also prevent the oil CL discharged from the coolant supply port 742 from flowing around the upper end 561 or the lower end 562 of the wall portion 56 and flowing into the bus bar receiving hole 552 . In other words, the oil CL can be more reliably suppressed from flowing into the bus bar receiving hole 552 .

In addition, since the wall portion 56 protrudes from the partition wall portion 513 , a gap is not formed between the wall portion 56 and the partition wall portion 513 . Therefore, the oil CL blown out from the coolant supply port 742 can be prevented from flowing into the bus bar accommodation hole 552 from between the wall portion 56 and the partition wall portion 513 . Furthermore, by providing the wall portion 56 , even when the pressurized oil CL is discharged from the coolant supply port 742 , the oil CL can be suppressed from flowing into the bus bar receiving hole 552 .

As described above, by providing the wall portion 56 , the oil CL blown out from the coolant supply port 742 can be prevented from intruding into the inside of the inverter housing portion 502 from the busbar housing hole 552 . In addition, the wall portion 56 makes it difficult for the oil CL to reach the busbar receiving hole 552 . Thereby, the oil CL is less likely to adhere to the busbar holder 62, the sealing member 63, etc. of the busbar unit 6, and the sealing member 63, etc. is less likely to be deteriorated. As a result, a gap is less likely to occur between the busbar unit 6 and the busbar receiving hole 552 over a longer period of time, and foreign matter such as oil, water, dust, dust, etc. can be suppressed from intruding into the inverter accommodating portion 502 over a long period of time. This allows the motor unit 1 to stably continue to output driving force for a long period of time.

<First modification>

The motor unit 1a according to the first modified example will be described with reference to the drawings. FIG. 8 is an axial view of the housing main body 51 a of the motor unit 1 a according to the first modification, with the first cover portion 52 removed. As shown in FIG. 8 , the housing main body 51 a of the motor unit 1 a is different from the housing main body 51 of the motor unit 1 a. In detail, the busbar arrangement part 55a and the wall part 56a of the housing main body 51a are different from the busbar arrangement part 55 and the wall part 56 of the housing main body 51. The other parts of the motor unit 1a have the same structure as the motor unit 1. Therefore, parts of the motor unit 1 a that are substantially the same as those of the motor unit 1 are denoted by the same reference numerals, and detailed descriptions of the same parts are omitted.

As shown in FIG. 8 , the wall portion 56a of the housing body 51a has a first wall portion 5601 and a second wall portion 5602. The first wall portion 5601 is disposed between the coolant supply port 742 and the bus bar receiving hole 552 in the circumferential direction. The first wall portion 5601 and the cover mounting rib 514 are formed from a single member.

The second wall portion 5602 is arranged in the radial direction of the coil 26 and the busbar receiving hole 552 between. Since the second wall portion 5602 is arranged, the busbar arrangement recessed portion 551a of the busbar arrangement portion 55a is separated from the inner surface of the cylindrical portion 511. Thereby, the space between the busbar arrangement recess 551a and the inside of the cylindrical part 511 is shielded by the second wall part 5602. In addition, the second wall part 5602 may be connected to the lower end of the first wall part 5601. By connecting the second wall portion 5602 to the lower end of the first wall portion 5601, the oil CL can be more reliably suppressed from flowing into the inverter housing portion 502.

That is, the wall portion 56 a has a first wall portion 5601 disposed between the coolant supply port 742 and the bus bar receiving hole 552 and a second wall portion 5602 disposed between the bus bar receiving hole 552 and the coil 26 .

The first wall portion 5601 can prevent the oil CL blown from the coolant supply port 742 from flowing directly into the bus bar receiving hole 552 . Furthermore, as described above, the motor shaft 22 of the motor 2 has the hollow portion 220 , and the oil CL flows in the hollow portion 220 . When the rotor 21 rotates, the oil CL flowing in the hollow portion 220 is blown toward the coil 26 . In addition, when oil CL accumulates inside the stator 24 of the motor 2 , the oil CL accumulated in the stator 24 may be lifted up by the rotation of the rotor 21 .

By arranging the second wall portion 5602 between the coil 26 and the busbar receiving hole 552 , the oil CL ejected from the motor shaft 22 and the oil CL lifted up by the rotor 21 can be prevented from reaching the busbar receiving hole 552 . This can prevent the oil CL from flowing into the inverter accommodating portion 502 .

<Second Modification>

FIG. 9 is a schematic layout diagram showing the axial arrangement of each part of the motor unit 1b according to the second modified example. In the motor unit 1b shown in FIG. 9, the wall portion 56 is omitted, and the housing The busbar receiving hole 552b of the main body 51b is different from the busbar receiving hole 552 of the housing main body 51. The other parts of the motor unit 1b have substantially the same structure as the motor unit 1. Therefore, parts of the motor unit 1 b that are substantially the same as those of the motor unit 1 are denoted by the same reference numerals, and detailed descriptions of the same parts are omitted.

As shown in FIG. 9 , the end portion 5522 on the axial side N of the busbar receiving hole 552b is disposed closer to the axial side than the coolant supply port 742 (indicated by Z3 ). Accordingly, even if the wall portion is not formed, the oil CL discharged from the coolant supply port 742 can be suppressed from reaching the bus bar receiving hole 552b.

Like the bus bar receiving hole 552 , the bus bar receiving hole 552 b has a portion disposed below the upper end of the motor 2 when viewed from the axial direction. That is, when viewed from the axial direction, at least part of the bus bar receiving hole 552 b is disposed below the upper end of the motor 2 . This allows the motor unit 1a to be flattened.

In addition, as shown in FIG. 9 , the end portion 5522 of the busbar receiving hole 552b on the axial side N is disposed closer to the other axial side T than the end portion 263 of the coil 26 on the axial side N. This can prevent excessive force from being applied when the coil wire 261 is wound.

In addition, the busbar receiving hole 552b is formed in the partition wall portion 513 arranged on the axial side N of the housing body 51b. That is, the housing 5 has the gear housing 503 that houses a plurality of gears on the other side T in the axial direction of the motor housing 501 . Thereby, the coil wire 261 connecting the bus bar 61 and the coil 26 can be processed at the end of the housing 5 opposite to the gear accommodating portion 503 . Therefore, the coil wire 261 is less likely to interfere when the gear unit 3 is assembled. Furthermore, when the motor unit 1 is driven, contact between the coil wire 261 and the gear portion 3 can be suppressed.

In addition, as shown in FIG. 10 , a wall portion 56 b protruding toward the axial side N from the end surface of the partition wall portion 513 of the housing body 51 b on the axial side N may be included. The wall portion 56b is disposed at least one of between the busbar receiving hole 552b and the coolant supply port 742 and between the busbar receiving hole 552b and the coil 26 .

That is, the housing 5 has the wall portion 56 b disposed at the end of the motor housing portion 501 on the axial direction side N, and the wall portion 56 b is disposed between the bus bar receiving hole 552 b and the coolant supply port 742 and between the bus bar receiving hole 552 b and the coil. At least one of the 26.

When the wall portion 56b is disposed between the bus bar accommodating hole 552b and the coolant supply port 742, the oil CL discharged from the coolant supply port 742 can be more reliably suppressed from flowing into the bus bar accommodating hole 552b. In addition, when the wall portion 56 b is disposed between the bus bar receiving hole 552 b and the coil 26 , the oil CL raised by the rotor 21 or injected from the motor shaft 22 can be more reliably suppressed from flowing into the bus bar receiving hole 552 b.

The embodiments of the present invention have been described above. However, each structure and combination thereof in the embodiments are merely examples, and additions, omissions, substitutions, and other changes of structures can be made without departing from the gist of the present invention. In addition, the present invention is not limited to the embodiment.

Industrial availability

The motor unit of the present invention can be used, for example, as at least part of a power source for a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), and an electric vehicle (EV).

1 motor unit; 21 rotor; 22 motor shaft; 24 stator; 25 stator core; 26 coils; 261 coil wire; 262 terminal; 5 shell; 501 Motor Containment Department; 502 Inverter Containment Unit; 51 shell body; 511 barrel; 5111 recess; 512 Box Department; 513 partition wall; 514 cover mounting rib; 515 flange; 517 The first output shaft passes through the hole; 53 second cover; 55 busbar configuration department; 551 busbar configuration recess; 56 wall; 6 busbar units; 612 terminal connection part; 62 busbar retaining parts; 622 retainer flange; 72 pumps; 73 oil cooler; 74 Coolant supply department; 741 pipe; 743 retainer; 744 Fixed components; J2 motor axis; X, Y, Z coordinate axes.

Claims (13)

A motor unit, characterized by comprising: a motor having a rotor and a stator, the rotor rotating about a motor axis extending in a horizontal direction as a center, the stator and the rotor facing each other across a gap in the radial direction; an inverter that controls power supplied to the motor; a coolant supply unit that is disposed above the motor and supplies coolant to the motor; and a casing , the housing has a motor housing portion and an inverter housing portion, the motor housing portion houses the motor and the coolant supply portion, the inverter housing portion houses the inverter; and a busbar, The bus bar connects the motor and the inverter, the stator has a stator core and a plurality of coils, the coolant supply part has a coolant supply port, and the coolant supply port is arranged at a position larger than the stator. The housing has a partition wall portion where an axial end of the core is close to the axial side and above the coil, and the partition wall portion is formed on an axial side of the inverter accommodating portion. The end portion separates the inverter receiving portion and the motor receiving portion in the axial direction, and a busbar receiving hole is formed in the partition wall portion, and the busbar receiving hole penetrates in the axial direction and accommodates the A part of the busbar, and the axial end of the busbar receiving hole is arranged on the stator in the axial direction. Between the axial end of the core and the coolant supply port, at least a part of the busbar receiving hole is disposed below the upper end of the motor when viewed from the axial direction, and the housing has A wall portion is disposed at an axial end of the motor receiving portion, and the wall portion is disposed between the bus bar receiving hole and the coolant supply port. The motor unit according to claim 1, wherein when viewed from the axial direction, the upper end of the wall portion is disposed above the coolant supply port, and the lower end of the wall portion is disposed higher than the coolant supply port. The supply port is at the bottom. The motor unit according to claim 1 or 2, wherein the wall portion protrudes in the axial direction from an end surface on an axial side of the partition wall portion. The motor unit according to claim 1 or 2, wherein the housing has a gear accommodating portion for accommodating a plurality of gears on the other axial side of the motor accommodating portion. The motor unit according to claim 1 or 2, wherein the coolant supply part is held on the wall part. The motor unit according to claim 5, wherein the coolant supply part is held at an axial end of the wall part. The motor unit according to claim 1 or 2, wherein the wall portion has: a first wall portion arranged between the coolant supply port and the busbar receiving hole; and a third wall portion. Two wall parts, the second wall part is arranged between the busbar receiving hole and the coil between. The motor unit according to claim 1 or 2, wherein a sealing member is provided in the busbar receiving hole. A motor unit, characterized by comprising: a motor having a rotor and a stator, the rotor rotating about a motor axis extending in a horizontal direction as a center, the stator and the rotor facing each other across a gap in the radial direction; an inverter that controls power supplied to the motor; a coolant supply unit that is disposed above the motor and supplies coolant to the motor; and a casing , the housing has a motor housing portion and an inverter housing portion, the motor housing portion houses the motor and the coolant supply portion, the inverter housing portion houses the inverter; and a busbar, The bus bar connects the motor and the inverter, the stator has a stator core and a plurality of coils, the coolant supply part has a coolant supply port, and the coolant supply port is arranged at a position larger than the stator. The housing has a partition wall portion where an axial end of the core is close to the axial side and above the coil, and the partition wall portion is formed on an axial side of the inverter accommodating portion. end, and separate the inverter receiving part and the motor receiving part in the axial direction, and a busbar receiving hole is formed in the partition wall part, and the busbar receiving hole is axially separated A part of the bus bar is penetrated and accommodated, and an axial end of the bus bar receiving hole is disposed closer to the axial side than the coolant supply port. The motor unit according to claim 9, wherein at least part of the busbar receiving hole is disposed below an upper end of the motor when viewed from an axial direction. The motor unit according to claim 9 or 10, wherein an axial end of the busbar receiving hole is disposed closer to the other axial side than an axial end of the coil. The motor unit according to claim 9 or 10, wherein the housing has a gear accommodating portion for accommodating a plurality of gears on the other axial side of the motor accommodating portion. The motor unit according to claim 9 or 10, wherein the housing has a wall portion disposed at an axial end of the motor receiving portion, and the wall portion is disposed between the bus bar receiving hole and At least one of between the coolant supply port and between the busbar receiving hole and the coil.

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