CN111512524B - Motor unit - Google Patents

Abstract

One embodiment of the present invention is a motor unit including: a motor; an inverter that supplies electric power to the motor; a bus bar having a 1 st extending portion extending in a 1 st direction, the bus bar connecting the motor with the inverter; a housing having a 1 st opening hole through which the 1 st extension part passes, the housing accommodating a motor; an inverter case having a 2 nd opening hole opposed to the 1 st opening hole in the 1 st direction and through which the 1 st extension portion passes, the inverter case housing an inverter; and a bus bar support member which supports the bus bar and is inserted into the 1 st opening hole and the 2 nd opening hole so as to straddle the 1 st opening hole and the 2 nd opening hole. The bus bar support member has a through hole penetrating the bus bar support member in the 1 st direction, and the 1 st extending portion is inserted into the through hole. A sealant is filled between the inner peripheral surface of the through hole and the 1 st extending portion.

Description

Motor unit

Technical Field

The present invention relates to a motor unit.

Background

In japanese patent gazette: japanese patent No. 4546689 describes a device for connecting a pole case of an electric motor to a case of control electronics.

Documents of the prior art

Patent document

Patent document 1: japanese patent gazette: japanese patent No. 4546689

Disclosure of Invention

Problems to be solved by the invention

When the bus bar extends across the inverter case that houses the motor case and the inverter, it is conceivable to provide a bus bar support member that supports the bus bar between the case and the inverter case. In this structure, if the bus bar and the bus bar support member are insert-molded with resin, the degree of freedom in assembling the motor unit and in disposing the members is easily restricted. On the other hand, if the bus bar and the bus bar support member are connected by assembly, there is a problem that oil or the like in the case easily penetrates into the inverter case through the gap between the bus bar and the bus bar support member.

In view of the above-described problems, an object of the present invention is to provide a motor unit that is easy to assemble, and suppresses entry of oil or the like into an inverter case from inside a case while ensuring the degree of freedom in the arrangement of components.

Means for solving the problems

One embodiment of the present invention is a motor unit including a motor; an inverter that supplies power to the motor; a bus bar having a 1 st extending portion extending in a 1 st direction, the bus bar connecting the motor and the inverter; a housing having a 1 st opening hole through which the 1 st extension part passes, the housing accommodating the motor; an inverter case having a 2 nd opening hole opposed to the 1 st opening hole in the 1 st direction and through which the 1 st extension portion passes, the inverter case housing the inverter; and a bus bar support member that supports the bus bar, the bus bar support member being inserted into the 1 st opening hole and the 2 nd opening hole so as to straddle the 1 st opening hole and the 2 nd opening hole, the bus bar support member having a through hole that penetrates the bus bar support member in the 1 st direction, the 1 st extension portion being inserted into the bus bar support member, and a sealant being filled between an inner peripheral surface of the through hole and the 1 st extension portion.

Effects of the invention

According to one embodiment of the present invention, a motor unit is provided that is easy to assemble, and that suppresses oil and the like from entering an inverter case from inside a case while ensuring the degree of freedom in the arrangement of components.

Drawings

Fig. 1 is a conceptual diagram of a motor unit according to an embodiment.

FIG. 2 is a side schematic view of a motor unit of one embodiment.

Fig. 3 is a partial sectional view of a motor unit of an embodiment.

Fig. 4 is a partially enlarged view of fig. 3.

Fig. 5 is a perspective view showing the vicinity of the bus bar support member.

Fig. 6 is a perspective view showing the vicinity of the bus bar support member.

Fig. 7 is a perspective view illustrating the bus bar supporting member, the 1 st sealing part, and the 2 nd sealing part.

Fig. 8 is a partial sectional view showing a modification of the motor unit according to the embodiment.

Detailed Description

Hereinafter, a motor unit according to an embodiment of the present invention will be described with reference to the drawings. 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 direction of gravity is defined based on the positional relationship in the case where the motor unit 1 is mounted on a vehicle on a horizontal road surface. 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 represents the vertical direction (i.e., the up-down direction), + Z-direction is the upper side (the opposite side to the direction of gravity), and-Z-direction is the lower side (the direction of gravity). The X-axis direction is a direction perpendicular to the Z-axis direction, and indicates the front-rear direction of the vehicle on which the motor unit 1 is mounted, + X direction is the front of the vehicle, and-X direction is the rear of the vehicle. However, the + X direction may be the vehicle rear direction and the-X direction may be the vehicle front direction. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and indicates the width direction (left-right direction) of the vehicle, the + Y direction is the vehicle left direction, and the-Y direction is the vehicle right direction. However, when the + X direction is the vehicle rear direction, the + Y direction may be the vehicle right direction and the-Y direction may be the vehicle left direction. That is, regardless of the direction of the X-axis, the + Y direction is one side of the vehicle in the right-left direction, and the-Y direction is the other side of the vehicle in the right-left direction.

In the following description, unless otherwise specified, the direction parallel to the motor axis J2 of the motor 2 (Y-axis direction) is simply referred to as "axial direction", the radial direction about the motor axis J2 is simply referred to as "radial direction", and the circumferential direction about the motor axis J2, that is, the direction about the motor axis J2 is simply referred to as "circumferential direction". However, the "parallel direction" also includes a substantially parallel direction.

Hereinafter, a motor unit (electric drive device) 1 according to an exemplary embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a conceptual diagram of a motor unit 1 according to an embodiment. Fig. 2 is a side view of the motor unit 1 as viewed from the side of the vehicle. Fig. 1 is a conceptual diagram, and the arrangement and size of each portion are not necessarily the same as those of the actual portion.

The motor unit 1 is mounted on a vehicle having a motor as a power source, such as a Hybrid Electric Vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an Electric Vehicle (EV), and is used as a power source for these vehicles.

As shown in fig. 1 to 3, the motor unit 1 of the present embodiment includes a motor (main motor) 2, a gear portion 3, a housing 6, an inverter 7, an inverter case 8, a bus bar 9, a bus bar support member 10, a 1 st seal portion 11, and a 2 nd seal portion 12. The motor axis J2 of the motor 2 extends in a direction perpendicular to a 1 st direction (X-axis direction in the example of the present embodiment) described later. The motor axis J2 extends in the Y-axis direction.

As shown in fig. 1, the motor 2 includes: a rotor 20 that rotates about a motor axis J2 extending in the horizontal direction; and a stator 30 located radially outside the rotor 20. The housing 6 is provided with a housing space 80 for housing the motor 2 and the gear portion 3. The housing space 80 is divided into a motor chamber 81 housing the motor 2 and a gear chamber 82 housing the gear portion 3.

< Motor >

The motor 2 is housed in a motor chamber 81 of the housing 6. The motor 2 has a rotor 20 and a stator 30 located radially outside the rotor 20. The motor 2 is an inner rotor type motor having a stator 30 and a rotor 20, and the rotor 20 is rotatably disposed inside the stator 30.

The rotor 20 is rotated by supplying electric power from a battery, not shown, to the stator 30 via the inverter 7. As shown in fig. 1 to 3, the rotor 20 includes a shaft (motor shaft) 21, a rotor core 24, and a rotor magnet 25. The rotor 20 (i.e., the shaft 21, the rotor core 24, and the rotor magnet 25) rotates about a motor axis J2 extending in the horizontal direction. The torque of the rotor 20 is transmitted to the gear portion 3.

The shaft 21 extends centering on a motor axis J2 extending in the horizontal direction and the width direction of the vehicle. The shaft 21 rotates about a motor axis J2. The shaft 21 is a hollow shaft having a hollow portion provided therein, the hollow portion having an inner peripheral surface extending along the motor axis J2.

The shaft 21 extends across a motor chamber 81 and a gear chamber 82 of the housing 6. One end of the shaft 21 protrudes toward the gear chamber 82 side. The 1 st gear 41 is fixed to an end of the shaft 21 projecting into the gear chamber 82.

The rotor core 24 is formed by laminating silicon steel plates. The rotor core 24 is a cylindrical body extending in the axial direction. A plurality of rotor magnets 25 are fixed to the rotor core 24. The plurality of rotor magnets 25 are arranged in the circumferential direction with magnetic poles alternating.

The stator 30 surrounds the rotor 20 from the radially outer side. In fig. 1, the stator 30 includes a stator core 32, a coil 31, and an insulator (not shown) interposed between the stator core 32 and the coil 31. The stator 30 is held by the housing 6. In fig. 3, the stator core 32 has a plurality of magnetic pole teeth extending radially inward from the inner circumferential surface of the annular yoke. A coil wire (not shown) is wound between the magnetic pole teeth. The coil wire wound around the magnetic pole teeth constitutes the coil 31. The coil wire is connected to the inverter 7 via a bus bar 9. As shown in fig. 1, the coil 31 has a coil end 31a protruding from an axial end face of the stator core 32. The coil end 31a protrudes in the axial direction from the end of the rotor core 24 of the rotor 20. The coil end 31a protrudes to both axial sides with respect to the rotor core 24.

< gear part >

The gear portion 3 is housed in a gear chamber 82 of the housing 6. The gear portion 3 is connected to the shaft 21 on one axial side of the motor axis J2. The gear portion 3 has a reduction gear 4 and a differential gear 5. The torque output from the motor 2 is transmitted to the differential device 5 via the reduction gear device 4.

< reduction gear >

The reduction gear 4 is connected to the rotor 20 of the motor 2. The reduction gear 4 has the following functions: the rotation speed of the motor 2 is reduced, and the torque output from the motor 2 is increased according to the reduction ratio. The reduction gear 4 transmits the torque output from the motor 2 to the differential device 5.

The reduction gear unit 4 has a 1 st gear (intermediate drive gear) 41, a 2 nd gear (intermediate gear) 42, a 3 rd gear (final drive gear) 43, and an intermediate shaft 45. The torque output from the motor 2 is transmitted to a ring gear (gear) 51 of the differential device 5 via the shaft 21 of the motor 2, the 1 st gear 41, the 2 nd gear 42, the counter shaft 45, and the 3 rd gear 43. The gear ratio of each gear, the number of gears, and the like can be variously changed according to a required reduction ratio. The reduction gear 4 is a parallel shaft gear type reduction gear in which the shaft cores of the respective gears are arranged in parallel.

The 1 st gear 41 is provided on the outer peripheral surface of the shaft 21 of the motor 2. The 1 st gear 41 rotates together with the shaft 21 about the motor axis J2. The intermediate shaft 45 extends along an intermediate axis J4 that is parallel to the motor axis J2. The intermediate shaft 45 rotates about the intermediate axis J4. The 2 nd gear 42 and the 3 rd gear 43 are provided on the outer peripheral surface of the intermediate shaft 45. The 2 nd gear 42 and the 3 rd gear 43 are connected via an intermediate shaft 45. The 2 nd gear 42 and the 3 rd gear 43 rotate about the intermediate axis J4. The 2 nd gear 42 meshes with the 1 st gear 41. The 3 rd gear 43 meshes with the ring gear 51 of the differential device 5. The 3 rd gear 43 is located on the partition wall 61c side with respect to the 2 nd gear 42.

< differential device >

The differential device 5 is connected to the motor 2 via the reduction gear 4. The differential device 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle. The differential device 5 has the following functions: when the vehicle turns, the same torque is transmitted to the axles 55 of the left and right wheels while absorbing the speed difference between the left and right wheels. The differential device 5 includes a ring gear 51, a gear box (not shown), a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown).

The ring gear 51 rotates about a differential axis J5 parallel to the motor axis J2. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4. That is, the ring gear 51 is connected to the motor 2 via another gear.

(arrangement of axes)

The motor axis J2, the intermediate axis J4, and the differential axis J5 extend parallel to each other in the horizontal direction. The intermediate axis J4 and the differential axis J5 are located on the lower side with respect to the motor axis J2. Therefore, the reduction gear 4 and the differential gear 5 are located below the motor 2.

As shown in fig. 2, when viewed from the axial direction of the motor axis J2, a segment virtually connecting the motor axis J2 and the intermediate axis J4 is referred to as a 1 st segment L1, a segment virtually connecting the intermediate axis J4 and the differential axis J5 is referred to as a 2 nd segment L2, and a segment virtually connecting the motor axis J2 and the differential axis J5 is referred to as a 3 rd segment L3.

The 2 nd line segment L2 extends in a substantially horizontal direction. That is, the intermediate axis J4 and the differential axis J5 are aligned in a substantially horizontal direction. In the present embodiment, the substantially horizontal direction of the 2 nd line segment L2 is a direction within ± 10 ° from the horizontal direction.

The angle α formed by the 2 nd line segment L2 and the 3 rd line segment L3 is 30 ° ± 5 °.

The 1 st line segment L1 extends in a substantially vertical direction. That is, the motor axis J2 and the intermediate axis J4 are aligned in the substantially vertical direction. In the present embodiment, the substantially vertical direction of the 1 st line segment L1 is a direction within ± 10 ° from the vertical direction.

The length L1 of the 1 st segment, the length L2 of the 2 nd segment, and the length L3 of the 3 rd segment satisfy the following relationship.

L1：L2：L3＝1：1.4～1.7：1.8～2.0

The reduction ratio from the motor 2 to the reduction mechanism of the differential device 5 is 8 or more and 11 or less. According to the present embodiment, a desired gear ratio (8 to 11) can be achieved while maintaining the positional relationship of the motor axis J2, the intermediate axis J4, and the differential axis J5 as described above.

< outer case >

The housing 6 is made of metal. Although not shown, the housing 6 is formed by combining a plurality of members. Alternatively, the housing 6 may be formed of a single member. As shown in fig. 1, the motor 2 and the gear portion 3 are housed in a housing space 80 provided inside the housing 6. The housing 6 holds the motor 2 and the gear portion 3 in the housing space 80. The housing 6 has a partition wall 61 c. The housing space 80 of the housing 6 is divided by a partition wall 61c into a motor chamber 81 and a gear chamber 82. The motor chamber 81 houses the motor 2. The gear chamber 82 houses the gear portion 3 (i.e., the reduction gear 4 and the differential gear 5).

An oil reservoir P in which the oil O is stored is provided in a lower region in the housing space 80. In the present embodiment, the bottom 81a of the motor chamber 81 is located above the bottom 82a of the gear chamber 82. Further, a partition wall opening 68 is provided in a partition wall 61c that partitions the motor chamber 81 and the gear chamber 82. The partition wall opening 68 communicates the motor chamber 81 with the gear chamber 82. The partition wall opening 68 moves the oil O accumulated in the lower region of the motor chamber 81 to the gear chamber 82. The partition wall 61c is provided with a through-insertion hole 61f through which the shaft 21 of the motor 2 is inserted, in addition to the partition wall opening 68 described above.

Part of the differential device 5 is immersed in the oil reservoir P. The oil O accumulated in the oil reservoir P is lifted by the operation of the differential device 5, and a part of the oil O diffuses into the gear chamber 82. The oil O diffused into the gear chamber 82 is supplied to the gears of the reduction gear 4 and the differential gear 5 in the gear chamber 82, and spreads over the tooth surfaces of the gears. The oil O used in the reduction gear 4 and the differential gear 5 drops and is collected by the oil reservoir P located below the gear chamber 82. The capacity of the oil reservoir P of the housing space 80 is such that a part of the bearings of the differential device 5 is immersed in the oil O when the motor unit 1 is stopped.

The oil O circulates in an oil passage (not shown) provided in the casing 6. The oil passage is a path of the oil O supplied from the oil reservoir P to the motor 2. The oil path supplies oil O to circulate and cool the motor 2.

The oil O is used for lubrication of the reduction gear 4 and the differential 5. In addition, the oil O is used for cooling the motor 2. The oil O is accumulated in a lower region (i.e., oil reservoir P) in the gear chamber 82. Since the oil O functions as a lubricating oil and a cooling oil, it is preferable to use an oil equivalent to an Automatic transmission lubricating oil (ATF) having a relatively low viscosity.

In fig. 1 and 2, the housing 6 has a motor housing portion 6a housing the motor 2 and a gear housing portion 6b housing the gear portion 3. That is, the motor 2 is housed in the housing 6. The motor housing portion 6a is cylindrical with the motor axis J2 as the center.

As shown in fig. 3 and 4, a wall portion 6e of the motor housing portion 6a facing the inverter case 8 is shaped like a plate extending perpendicular to the X axis. The motor housing portion 6a has a 1 st opening hole 6 c. The 1 st opening hole 6c is disposed in the wall portion 6e and opens in the X-axis direction. That is, the housing 6 has the 1 st opening hole 6 c. The 1 st opening hole 6c penetrates the motor housing portion 6a in the radial direction. The 1 st opening hole 6c penetrates the motor housing 6a in the X-axis direction.

In the example of the present embodiment, the 1 st opening hole 6c has an oblong shape when viewed from the X-axis direction. The 1 st opening hole 6c has an oblong circular shape extending in the Y axis direction. That is, the 1 st aperture 6c has an opening dimension in the Y axis direction larger than an opening dimension (inner diameter dimension) in the Z axis direction when viewed from the X axis direction.

As shown in fig. 2, the gear housing portion 6b has a protruding portion 6d that protrudes radially with respect to the motor housing portion 6a when viewed from the axial direction. In the present embodiment, the protruding portion 6d protrudes toward the vehicle rear side and the lower side with respect to the motor housing portion 6 a. The protruding portion 6d receives a part of the gear portion 3. More specifically, a part of the 2 nd gear 42, a part of the 3 rd gear 43, and a part of the ring gear 51 are housed inside the extension portion 6 d. The projecting portion 6d is provided with an axle passage hole 61 e. The axle passage hole 61e penetrates the projecting portion 6d in the Y-axis direction. As shown in fig. 1, the axle passage holes 61e are provided in a pair of wall portions located at both ends of the projecting portion 6d in the Y-axis direction, respectively. The axle shaft 55 is inserted through the axle shaft passage hole 61 e.

< inverter >

The inverter 7 is electrically connected to the motor 2. The inverter 7 supplies electric power to the motor 2. The inverter 7 supplies electric power to the stator 30 via the bus bar 9. The inverter 7 controls the current supplied to the motor 2. The inverter 7 has a circuit board and a capacitor.

< inverter case >

As shown in fig. 2 and 3, the inverter case 8 is a rectangular parallelepiped container. The inverter case 8 is made of metal. However, the inverter case 8 may be made of resin. The inverter case 8 houses an inverter 7. The inverter case 8 and the motor housing portion 6a are disposed adjacent to each other in the radial direction of the motor axis J2. The inverter case 8 is adjacent to the motor housing portion 6a in the horizontal direction. The inverter case 8 has a bottomed cylindrical case body 8d and a lid portion 8e closing an upper opening of the case body 8 d.

In fig. 3, the inverter case 8 has a brim 8a in a case body 8 d. The brim 8a protrudes in the X-axis direction from the upper end of the peripheral wall of the housing main body 8d, and has a plate shape extending in the Y-axis direction. The plate surface of the eave portion 8a faces in the Z-axis direction. The flange 8a is provided with a screw hole (not shown) penetrating the flange 8a in the Z-axis direction. A screw member 6f is inserted into the screw hole. The screw member 6f is screwed into a screw hole (not shown) of the motor housing portion 6 a. The screw hole is provided in the ceiling wall of the motor housing portion 6a and opens upward. The screw member 6f is screwed in the Z-axis direction with respect to the housing 6. The inverter case 8 is fixed to the housing 6 using a screw member 6 f. The inverter case 8 is fixed to an outer peripheral surface of the motor housing portion 6a facing radially outward.

Of the peripheral wall of the housing main body 8d, a wall 8b facing the motor housing portion 6a is plate-shaped extending perpendicular to the X axis. In the illustrated example, the thickness (wall thickness) of the lower portion of the wall portion 8b is thicker than the thickness of the upper portion of the wall portion 8b located above the lower portion.

The inverter case 8 has a 2 nd opening hole 8 c. The 2 nd opening hole 8c is disposed in the wall portion 8b of the housing main body 8d and opens in the X-axis direction. The 2 nd opening hole 8c is located at a lower side portion of the wall portion 8 b. The 2 nd opening hole 8c penetrates the inverter case 8 in the radial direction. The 2 nd opening hole 8c penetrates the inverter case 8 in the X axis direction. The 2 nd opening 8c faces the 1 st opening 6c in the 1 st direction (X-axis direction in the present embodiment) described later.

In the example of the present embodiment, the 2 nd opening hole 8c has an oblong shape when viewed from the X-axis direction. The 2 nd opening 8c has an oblong shape extending in the Y axis direction. That is, the opening size of the 2 nd opening hole 8c in the Y axis direction is larger than the opening size (inner diameter size) in the Z axis direction when viewed from the X axis direction. In the example of the present embodiment, the 2 nd opening hole 8c and the 1 st opening hole 6c have portions having the same shape as each other in a cross section perpendicular to the X axis. The shape of the 2 nd opening 8c and the shape of the 1 st opening 6c coincide with each other when viewed from the X-axis direction.

< bus bar >

The bus bar 9 connects the motor 2 and the inverter 7. The bus bar 9 electrically connects the stator 30 and the inverter 7. As shown in fig. 5 and 6, a plurality of bus bars 9 are provided. In the present embodiment, 3 bus bars 9 are provided. The phases of the currents flowing on the 3 bus bars 9 are different from each other. Each current flowing through the 3 bus bars 9 is U-phase, V-phase, or W-phase. The plate surface of the bus bar 9 faces the Z-axis direction. The plurality of bus bars 9 are arranged in a direction perpendicular to the 1 st direction (X-axis direction) described later. The plurality of bus bars 9 are arranged at intervals from each other in the Y-axis direction.

In fig. 3 and 4, the bus bar 9 has a 1 st extension part 9a, a 2 nd extension part 9b, and a 3 rd extension part (not shown). The 1 st extension 9a extends in the 1 st direction. In the present embodiment, the 1 st direction is the X-axis direction. The direction from the 2 nd opening hole 8c toward the 1 st opening hole 6c in the 1 st direction is the 1 st direction side. The 1 st direction side is the + X direction. The direction from the 1 st opening hole 6c toward the 2 nd opening hole 8c in the 1 st direction is the 1 st direction other side. The other side of the 1 st direction is the-X direction.

The 1 st extension 9a passes through the 1 st opening hole 6 c. The 1 st extension 9a extends throughout the inside and outside of the housing 6. The 1 st extending portion 9a extends through the 1 st opening hole 6c so as to extend inside and outside the motor housing portion 6 a. The 1 st extending portion 9a has a 1 st direction side end portion disposed on the 1 st direction side of the 1 st opening hole 6 c. The 1 st extending portion 9a has a 1 st direction side end portion located inside the housing 6.

The 1 st extension 9a passes through the 2 nd opening hole 8 c. The 1 st extension portion 9a extends throughout the inside and outside of the inverter case 8. The 1 st extending portion 9a has the other end in the 1 st direction disposed on the other side in the 1 st direction from the 2 nd opening hole 8 c. The 1 st extending portion 9a has an end portion on the other side in the 1 st direction located inside the inverter case 8.

The 2 nd extending portion 9b extends from the 1 st extending portion 9a in a direction crossing the 1 st direction inside the housing 6. The 2 nd extending part 9b is connected to the 1 st direction side end part of the 1 st extending part 9 a. The 2 nd extending portion 9b extends from the 1 st extending portion 9a in a direction perpendicular to the 1 st direction. The 2 nd extending portion 9b extends in the 2 nd direction among the directions perpendicular to the 1 st direction. In the present embodiment, the 2 nd direction is the Z-axis direction. That is, the 2 nd extending portion 9b extends in the Z-axis direction. In the illustrated example, the 2 nd extending portion 9b extends from a connection portion with the 1 st extending portion 9a toward an upper side. Among the plurality of bus bars 9, a bus bar 9 in which the 2 nd extending portion 9b extends toward the upper side from the connecting portion with the 1 st extending portion 9a and a bus bar 9 extending toward the lower side are included.

Although not shown, the 3 rd extending portion extends from the 2 nd extending portion 9b in a direction intersecting the 1 st direction and the 2 nd direction inside the housing 6. The 3 rd extending portion is connected to the end of the 2 nd extending portion 9b in the Y axis direction. The 3 rd extending portion extends from the 2 nd extending portion 9b in a direction perpendicular to the 1 st direction and the 2 nd direction. The 3 rd extending portion extends in a 3 rd direction perpendicular to the 1 st and 2 nd directions. In the present embodiment, the 3 rd direction is the Y-axis direction. That is, the 3 rd extending portion extends in the Y-axis direction.

< bus bar support part >

As shown in fig. 3 and 4, the bus bar support member 10 supports the bus bar 9 and is inserted so as to straddle the 1 st opening 6c and the 2 nd opening 8 c. The bus bar support member 10 is made of resin. Fig. 5 and 6 are perspective views of the bus bar support member 10 viewed toward the 1 st direction side (+ X direction). Fig. 7 is a perspective view of the bus bar support member 10 viewed toward the other side (the-X direction) in the 1 st direction. The length of the bus bar support member 10 in the 2 nd direction (Z-axis direction) is smaller than the length in the 3 rd direction (Y-axis direction) when viewed from the 1 st direction (X-axis direction). In the example of the present embodiment, the bus bar support member 10 has an oblong shape when viewed from the 1 st direction. When viewed from the 1 st direction, the bus bar support member 10 has an oblong shape with the Y-axis direction as the major axis and the Z-axis direction as the minor axis.

The bus bar support member 10 has a columnar shape extending in the 1 st direction. The outer peripheral surface of the bus bar support member 10 faces the inner peripheral surface of the 1 st open hole 6 c. The outer peripheral surface of the bus bar support member 10 has a portion facing the inner peripheral surface of the 1 st opening 6 c. The portion of the outer peripheral surface of the bus bar support member 10 on the 1 st direction side faces the inner peripheral surface of the 1 st open hole 6 c. The outer peripheral surface of the bus bar support member 10 faces the inner peripheral surface of the 2 nd opening hole 8 c. The outer peripheral surface of the bus bar support member 10 has a portion facing the inner peripheral surface of the 2 nd opening hole 8 c. The portion of the outer peripheral surface of the bus bar support member 10 on the other side in the 1 st direction faces the inner peripheral surface of the 2 nd open hole 8 c. That is, the outer peripheral surface of the bus bar support member 10 faces the inner peripheral surface of the 1 st open hole 6c and the inner peripheral surface of the 2 nd open hole 8 c. Therefore, the bus bar support member 10 ensures insulation between the 1 st opening 6c of the housing 6 and the bus bar 9. The bus bar support member 10 ensures insulation between the 2 nd opening hole 8c of the inverter case 8 and the bus bar 9.

As shown in fig. 7, a portion of the outer peripheral surface of the bus bar support member 10 facing the 2 nd direction is planar. The outer peripheral surface of the bus bar support member 10 has a convex curved surface facing the 3 rd direction. The end surface of the bus bar support member 10 facing the 1 st direction has an oblong shape. The end surface of the bus bar support member 10 facing the 1 st direction has an oblong shape with the Y-axis direction as the major axis and the Z-axis direction as the minor axis.

The bus bar support member 10 has a through hole 10a, a 1 st recessed portion 10b, a 2 nd recessed portion 10c, a protruding portion 10d, a 1 st groove portion 10e, and a 2 nd groove portion 10 f. As shown in fig. 3 and 4, the through-hole 10a penetrates the bus bar support member 10 in the 1 st direction. The 1 st extending portion 9a is inserted into the through hole 10 a. The 1 st extending portion 9a protrudes from the inside of the through hole 10a toward the 1 st direction side. The 1 st extending portion 9a protrudes from the inside of the through hole 10a toward the other side in the 1 st direction.

A sealant is filled between the inner peripheral surface of the through-hole 10a and the 1 st extending portion 9 a. In the present embodiment, the bus bar 9 and the bus bar support member 10 are not insert-molded with resin, but the bus bar 9 and the bus bar support member 10 are separately manufactured as separate members and then assembled. Therefore, the ease of assembling the motor unit 1 and the degree of freedom of arrangement of the components can be improved. Since the sealant is filled between the through-hole 10a of the bus bar support member 10 and the 1 st extending portion 9a of the bus bar 9, the oil or the like in the case 6 can be prevented from entering the inverter case 8 through the gap between the bus bar support member 10 and the bus bar 9.

The sealant is an adhesive. Therefore, the sealing property of the bus bar 9 and the bus bar support member 10 can be ensured by the sealant, and the bus bar 9 and the bus bar support member 10 can be fixed. For example, compared to the case where the 1 st extending portion 9a of the bus bar 9 is assembled to the through hole 10a of the bus bar support member 10 by strong press-fitting, the bus bar 9 and the bus bar support member 10 can be fixed while suppressing the load applied to the members, and therefore, the deformation or positional displacement of the members can be suppressed.

The through-hole 10a has a rectangular cross section perpendicular to the 1 st direction. The through-hole 10a has a rectangular shape extending in the 3 rd direction when viewed from the 1 st direction. As shown in fig. 5 to 7, a plurality of through holes 10a are provided. That is, the bus bar support member 10 has a plurality of through holes 10 a. In the present embodiment, 3 through holes 10a are provided. Any of the U-phase bus bar 9, the V-phase bus bar 9, and the W-phase bus bar 9 is inserted into the 3 through holes 10 a. The plurality of through holes 10a are arranged in a direction perpendicular to the 1 st direction (X-axis direction). The plurality of through holes 10a are arranged at intervals in the Y axis direction.

As shown in fig. 4 to 6, the 1 st recess 10b is disposed on the end surface of the bus bar support member 10 facing the other side in the 1 st direction. The 1 st recess 10b is recessed from the end surface of the bus bar support member 10 facing the 1 st direction other side toward the 1 st direction one side. The 1 st recess 10b has a rectangular shape extending in the 3 rd direction when viewed from the 1 st direction. The opening size of the 1 st recess 10b in the 2 nd direction is larger than the opening size of the through hole 10a in the 2 nd direction. The opening size of the 1 st recess 10b in the 3 rd direction is larger than the opening size of the through hole 10a in the 3 rd direction.

The through hole 10a opens into the 1 st recess 10 b. Therefore, when the sealant is filled between the through-hole 10a of the bus bar support member 10 and the 1 st extending portion 9a of the bus bar 9, the sealant can be held in the 1 st recessed portion 10 b. In the present embodiment, the sealant is injected into the 1 st recess 10b and is impregnated into the through-hole 10 a. Since the 1 st recessed portion 10b is provided, the sealant can be prevented from dropping without entering the gap between the bus bar support member 10 and the bus bar 9. Since the sealant is accumulated in the 1 st recess 10b, the sealant can easily enter the through hole 10a opening to the 1 st recess 10 b. The sealant is temporarily held in the 1 st recessed portion 10b, and thus the injection amount of the sealant can be easily visually confirmed. A predetermined amount of the sealant can be stably filled in the gap between the bus bar support member 10 and the bus bar 9.

The plurality of through holes 10a open into the 1 st recess 10 b. Therefore, by injecting the sealant into the 1 st recess 10b, the sealant can be spread over the plurality of through holes 10a, and the ease of assembly is improved. The sealant is uniformly filled in the plurality of through holes 10 a. In the example of the present embodiment, the 1 st recessed portion 10b is a groove extending in the direction in which the plurality of through holes 10a are arranged. Therefore, the arrangement space of the 1 st recess 10b can be suppressed to be small. The penetration of the sealant from the 1 st recess 10b into the plurality of through holes 10a can be effectively suppressed. The amount of unnecessary sealant that does not reach the inside of the through-hole 10a from the 1 st recessed portion 10b can be suppressed.

As shown in fig. 4 and 7, the 2 nd recessed portion 10c is disposed on the end surface of the bus bar support member 10 facing the 1 st direction side. The 2 nd recessed portion 10c is recessed from the end surface of the bus bar support member 10 facing the 1 st direction side toward the 1 st direction side. The 2 nd recess 10c has a rectangular shape extending in the 3 rd direction when viewed from the 1 st direction. The opening dimension of the 2 nd recess 10c in the 2 nd direction is larger than the opening dimension of the through hole 10a in the 2 nd direction. The opening size of the 2 nd recess 10c in the 3 rd direction is larger than the opening size of the through hole 10a in the 3 rd direction.

The through hole 10a opens into the 2 nd recess 10 c. That is, the through-hole 10a penetrates the bus bar support member 10 in the 1 st direction from the bottom surface of the 1 st recessed portion 10b to the bottom surface of the 2 nd recessed portion 10 c. The bottom surface of the 1 st concave portion 10b is a portion facing the other side in the 1 st direction in the inner surface of the 1 st concave portion 10 b. The bottom surface of the 2 nd concave portion 10c is a portion facing the 1 st direction side in the inner surface of the 2 nd concave portion 10 c. According to the present embodiment, when the sealant is filled between the through-hole 10a of the bus bar support member 10 and the 1 st extending portion 9a of the bus bar 9, the sealant can be held in the 2 nd recessed portion 10 c. Specifically, when the sealant is injected into the 1 st recess 10b and enters the through hole 10a, if a large amount of sealant is injected, the excess sealant may be leached out from the through hole 10a toward the 1 st direction side. In the present embodiment, since the 2 nd recessed portion 10c is provided, even if an excessive sealant is leached from the through hole 10a toward the 1 st direction side, the sealant can be accumulated in the 2 nd recessed portion 10c, and the sealant can be suppressed from dropping.

A plurality of 2 nd recesses 10c are provided. That is, the bus bar support member 10 has a plurality of 2 nd recesses 10 c. In the present embodiment, 32 nd recesses 10c are provided. The plurality of 2 nd recesses 10c are arranged at intervals in the 3 rd direction. The 1 st direction side end portions of the through holes 10a are open to the bottom surfaces of the 2 nd recessed portions 10 c. In the example of the present embodiment, the cross-sectional area (opening area) perpendicular to the 1 st direction of the portion of the through-hole 10a connected to the 2 nd recess 10c increases toward the 1 st direction side. According to the present embodiment, since the plurality of 2 nd recessed portions 10c are provided independently of one another on the end surface of the bus bar support member 10 facing the 1 st direction side, it is easier to secure a large surface area of the inner surface of each 2 nd recessed portion 10c, compared to a configuration in which the 2 nd recessed portions 10c are connected to 1. Therefore, an excessive sealant can be easily accumulated in the 2 nd recess 10 c. Further, since the plurality of 2 nd recessed portions 10c are disposed apart from each other, the bus bar 9 can be inserted into the through hole 10a from each of the 2 nd recessed portions 10c when the motor unit 1 is assembled, and the assembly can be easily performed.

As shown in fig. 4, the depth of the 2 nd recessed portion 10c in the 1 st direction is deeper than the depth of the 1 st recessed portion 10b in the 1 st direction. The volume of the 2 nd recess 10c is larger than that of the 1 st recess 10 b. Therefore, the excessive sealant is further suppressed from dropping from the 2 nd concave portion 10 c.

As shown in fig. 4 to 7, the convex portion 10d protrudes from the outer peripheral surface of the bus bar support member 10 in a direction intersecting the 1 st direction. The convex portion 10d protrudes from the outer peripheral surface of the bus bar support member 10 in the 2 nd direction (Z-axis direction). In the example of the present embodiment, the convex portion 10d has a rectangular parallelepiped shape. The convex portion 10d has a rectangular shape elongated in the 3 rd direction (Y-axis direction) when viewed from the 1 st direction (X-axis direction). The convex portion 10d has a rectangular shape elongated in the 3 rd direction when viewed from the 2 nd direction (Z-axis direction).

As shown in fig. 4, the convex portion 10d is disposed between the case 6 and the inverter case 8 in the 1 st direction, and is in contact with the case 6 and the inverter case 8. Therefore, when the inverter case 8 is assembled to the housing 6, the convex portion 10d of the bus bar support member 10 is sandwiched between the housing 6 and the inverter case 8 in the 1 st direction. The bus bar support member 10 can be suppressed from moving in the 1 st direction with respect to the case 6 and the inverter case 8. A screw member or the like for fixing the bus bar support member 10 with respect to the housing 6 and the inverter case 8 is not required, so that the structure is simplified and the motor unit 1 is easily assembled. Even if the assembling direction of the bus bar support member 10 with respect to the housing 6 and the inverter case 8 is defined by providing the convex portion 10d on the bus bar support member 10, the bus bar support member 10 and the bus bar 9 can be assembled as described above in the present embodiment. Therefore, the motor unit 1 can be easily assembled, and the degree of freedom in the arrangement of the components can be secured.

As shown in fig. 4 to 7, the convex portion 10d is disposed in a portion facing the 2 nd direction in the outer peripheral surface of the bus bar support member 10. When viewed from the 1 st direction, a region (outer circumferential dimension) in which the convex portion 10d is arranged can be secured larger in a portion of the outer circumferential surface of the bus bar support member 10 that faces the 2 nd direction (short axis direction) than in a portion of the outer circumferential surface of the bus bar support member 10 that faces the 3 rd direction (long axis direction). Therefore, by disposing the convex portion 10d at the portion facing the 2 nd direction of the outer peripheral surface of the bus bar support member 10, the degree of freedom of the shape and the disposition of the convex portion 10d is improved. Further, by sandwiching the convex portion 10d between the case 6 and the inverter case 8, the bus bar support member 10 can be suppressed from falling in the 1 st direction. The term "tilt" refers to a rotation of the bus bar support member 10 about an imaginary axis (Y axis) extending in the 3 rd direction.

As shown in fig. 4 and 6, the convex portions 10d are disposed at both end portions of the outer peripheral surface of the bus bar support member 10 facing the 2 nd direction. Therefore, the bus bar support member 10 can be further suppressed from falling down, and the mounting posture of the bus bar support member 10 can be stabilized.

A plurality of convex portions 10d are provided on the outer peripheral surface of the bus bar support member 10 at intervals as viewed from the 1 st direction. The plurality of convex portions 10d can further stabilize the mounting posture of the bus bar support member 10. A plurality of convex portions 10d are provided on the outer peripheral surface of the bus bar support member 10 at intervals in the 3 rd direction. In the example word of the present embodiment, 3 (6 in total) bus bar supporting members 10 are provided at both end portions of the bus bar supporting member 10 in the 2 nd direction, respectively. According to the present embodiment, since the plurality of projections 10d are aligned in the 3 rd direction, the bus bar support member 10 can be suppressed from rotating about the virtual axis (Z axis) extending in the 2 nd direction.

The convex portion 10d has a protrusion 10g and a flat portion 10 h. The protrusion 10g is provided on at least one of both end surfaces of the convex portion 10d facing the 1 st direction. In the present embodiment, the protruding portion 10g is provided only on one of both end surfaces of the protruding portion 10d facing the 1 st direction. The projection 10g projects in the 1 st direction from the end face of the projection 10d facing in the 1 st direction. When the motor unit 1 is assembled, the protrusion 10g of the convex portion 10d allows the 1 st direction approach movement of the outer case 6 and the inverter case 8 while being compressed in the 1 st direction between the outer case 6 and the inverter case 8. The protrusion 10g can be plastically deformed beyond the elastic deformation region, for example. The protrusion 10g is, for example, a pressing rib.

By crushing the protrusion 10g, the housing 6 and the inverter case 8 can be easily aligned in the 1 st direction. When the case 6 and the inverter case 8 are fastened and fixed by the screw member 6f (see fig. 3) from the 2 nd direction (Z-axis direction) perpendicular to the 1 st direction as in the present embodiment, the screw hole of the flange 8a through which the screw member 6f passes can be easily aligned with the screw hole of the ceiling wall of the motor housing portion 6a into which the screw member 6f is screwed. Since the bus bar supporting member 10 is made of insulating resin, it is difficult to ensure dimensional accuracy after molding, and according to the present embodiment, the allowable range of dimensional accuracy of the bus bar supporting member 10 is expanded. By crushing the protruding portion 10g, the state in which the protruding portion 10d is in contact with both the housing 6 and the inverter case 8 is maintained, and movement (rattling) of the bus bar support member 10 relative to the housing 6 and the inverter case 8 after assembly can be suppressed. According to the present embodiment, the motor unit 1 can be easily assembled.

In the present embodiment, since the plurality of convex portions 10d are provided and the protruding portions 10g are provided in each of the convex portions 10d, the number and arrangement of the protruding portions 10g can be optimized according to the magnitude and balance of the force when the inverter case 8 is pushed into the case 6 in the 1 st direction at the time of assembly.

In the present embodiment, the projection 10g is provided on the end surface of the convex portion 10d facing the other side in the 1 st direction. The projection 10g projects from the end surface of the projection 10d facing the other side in the 1 st direction, and contacts the inverter case 8. The end surface of the convex portion 10d facing the 1 st direction side is in contact with the housing 6. An end surface of the convex portion 10d facing the 1 st direction side is in contact with the wall portion 6e of the motor housing portion 6a from the 1 st direction side. According to the present embodiment, when the motor unit 1 is assembled, the bus bar 9 can be fixed to the bus bar support member 10 and the inverter case 8 can be attached to the housing 6 in a state where the bus bar support member 10 is positioned in the 1 st direction by being brought into contact with the housing 6 from the 1 st direction other side. At the time of assembly, the bus bar support member 10 can be suppressed from moving to the 1 st direction side with respect to the housing 6, and the load is suppressed from being applied to the fixed portion of the bus bar 9 and the bus bar support member 10. In addition, the assembly of the bus bar support member 10 and the inverter case 8 can be stably performed.

As shown in fig. 5 and 6, the protrusion 10g is a rib extending from the outer peripheral surface of the bus bar support member 10 in the direction in which the convex portion 10d protrudes. In the present embodiment, the convex portion 10d protrudes from the outer peripheral surface of the bus bar support member 10 in the 2 nd direction, and the protruding portion 10g extends in the 2 nd direction. Since the projection 10g is a rib, the projection 10g is easily formed as compared with a dot-like projection 10g, for example, and the function of the projection 10g is stabilized.

The cross-sectional area of the projection 10g perpendicular to the 1 st direction decreases as it is farther from the 1 st direction from the end surface of the projection 10d facing the 1 st direction. In the present embodiment, the cross-sectional area of the projection 10g perpendicular to the 1 st direction is smaller as it is farther from the end surface of the projection 10d facing the 1 st direction toward the 1 st direction other side. In the example of the present embodiment, the cross-sectional shape of the projection 10g perpendicular to the 2 nd direction is a triangular shape whose tip becomes narrower as it goes away from the end face of the convex portion 10d in the 1 st direction toward the 1 st direction. Therefore, when the motor unit 1 is assembled, the projection 10g is easily deformed at a stage when the projection 10g starts to contact the inverter case 8, and the inverter case 8 can be easily moved closer to the housing 6. Then, at the stage of accurately aligning the inverter case 8 and the case 6, the projection 10g can be made less likely to be deformed, and the relative position between the case 6 and the inverter case 8 can be easily finely adjusted.

The flat portion 10h is provided on the end surface of the convex portion 10d facing the 1 st direction side. The flat portion 10h is a flat surface extending perpendicularly to the 1 st direction (X-axis direction). The flat portion 10h is in contact with the outer shell 6. The flat portion 10h contacts the wall portion 6e of the motor housing portion 6a from the other side in the 1 st direction. When the motor unit 1 is assembled, the flat portion 10h of the convex portion 10d is brought into contact with the housing 6, whereby the end surface of the convex portion 10d on the 1 st direction side can be set as a reference surface. That is, the bus bar support member 10 is positioned in the 1 st direction with respect to the housing 6 using the 1 st direction one end surface of the convex portion 10d, and the above-described operational effect can be obtained by the protrusion portion 10g of the 1 st direction other end surface of the convex portion 10 d.

As shown in fig. 4, the 1 st groove portion 10e is provided in a portion of the outer peripheral surface of the bus bar support member 10 that faces the inner peripheral surface of the 1 st opening hole 6 c. The 1 st groove portion 10e is disposed in a portion of the outer peripheral surface of the bus bar support member 10 on the 1 st direction side. The 1 st groove portion 10e is disposed on the 1 st direction side of the convex portion 10d in the outer peripheral surface of the bus bar support member 10. The 1 st groove portion 10e has an annular shape extending along the inner peripheral surface of the 1 st opening 6c when viewed from the 1 st direction. The 1 st groove portion 10e has an oblong shape elongated in the 3 rd direction when viewed from the 1 st direction.

The 2 nd groove portion 10f is provided in a portion of the outer peripheral surface of the bus bar support member 10 that faces the inner peripheral surface of the 2 nd open hole 8 c. The 2 nd groove portion 10f is disposed in a portion of the outer peripheral surface of the bus bar support member 10 on the other side in the 1 st direction. The 2 nd groove portion 10f is disposed on the other side in the 1 st direction from the convex portion 10d in the outer peripheral surface of the bus bar support member 10. The 2 nd groove portion 10f is annular extending along the inner peripheral surface of the 2 nd opening 8c when viewed from the 1 st direction. The 2 nd groove portion 10f has an oblong shape elongated in the 3 rd direction when viewed from the 1 st direction.

< 1 st seal part >

The 1 st seal portion 11 is disposed between the inner peripheral surface of the 1 st opening hole 6c and the outer peripheral surface of the bus bar support member 10 facing the inner peripheral surface. The 1 st sealing portion 11 is in contact with the inner peripheral surface of the 1 st open hole 6c and the outer peripheral surface of the bus bar support member 10. The 1 st seal portion 11 is elastically deformable. The 1 st seal portion 11 is annular. The 1 st sealing part 11 has an oblong shape extending along the outer peripheral surface of the bus bar support member 10 when viewed from the 1 st direction. In the present embodiment, the 1 st sealing portion 11 is an O-ring or the like provided as a separate member from the bus bar support member 10.

When the motor unit 1 is assembled, the 1 st sealing portion 11 is brought into contact with the inner peripheral surface of the 1 st open hole 6c and the outer peripheral surface of the bus bar support member 10 by inserting the bus bar support member 10 into the 1 st open hole 6c of the housing 6, thereby sealing the peripheral surfaces from each other. That is, the 1 st sealing part 11 seals the 1 st opening hole 6c and the bus bar support member 10 in a radial direction assuming that the 1 st extending part 9a of the bus bar 9 is the central axis. Therefore, the first sealing portion 11 prevents foreign matter such as water from entering the housing 6 from the outside, and oil from leaking from the inside to the outside of the housing 6. According to the present embodiment, the structure can be simplified while ensuring the insulation of the bus bar 9 and the sealing property of the 1 st opening hole 6 c.

The 1 st seal part 11 is disposed in the 1 st groove part 10 e. Therefore, the 1 st seal part 11 can be easily attached, and the positional displacement of the 1 st seal part 11 during and after the assembly of the motor unit 1 can be suppressed. The 1 st groove portion 10e stably ensures the sealing property of the 1 st seal portion 11.

< 2 nd seal part >

The 2 nd seal portion 12 is disposed between the inner peripheral surface of the 2 nd open hole 8c and the outer peripheral surface of the bus bar support member 10 facing the inner peripheral surface. The 2 nd sealing portion 12 is in contact with the inner peripheral surface of the 2 nd open hole 8c and the outer peripheral surface of the bus bar support member 10. The 2 nd seal portion 12 is elastically deformable. The 2 nd seal portion 12 has an annular shape. The 2 nd sealing part 12 has an oblong shape extending along the outer peripheral surface of the bus bar support member 10 when viewed from the 1 st direction. In the present embodiment, the 2 nd sealing portion 12 is an O-ring or the like provided as a separate member from the bus bar support member 10.

When the motor unit 1 is assembled, the bus bar support member 10 is inserted into the 2 nd opening 8c of the inverter case 8, and the 2 nd sealing portion 12 contacts the inner peripheral surface of the 2 nd opening 8c and the outer peripheral surface of the bus bar support member 10, thereby sealing the peripheral surfaces from each other. That is, the 2 nd sealing portion 12 seals the gap between the 2 nd opening hole 8c and the bus bar support member 10 in the radial direction assuming that the 1 st extending portion 9a of the bus bar 9 is the center axis. Therefore, the 2 nd sealing portion 12 prevents foreign matter such as water from entering the inverter case 8 from the outside. According to the present embodiment, the structure can be simplified while ensuring the insulation of the bus bar 9 and the sealing property of the 2 nd opening hole 8 c.

The 2 nd seal part 12 is disposed in the 2 nd groove part 10 f. Therefore, the 2 nd seal part 12 can be easily attached, and the positional displacement of the 2 nd seal part 12 between the time of assembling the motor unit 1 and the time after assembling can be suppressed. The 2 nd groove portion 10f stably ensures the sealing property of the 2 nd seal portion 12.

In the present embodiment, the projection 10d is sandwiched between the case 6 and the inverter case 8 in the 1 st direction, whereby the relative position between the 1 st opening hole 6c and the 1 st groove portion 10e in the 1 st direction is stabilized. Therefore, the relative position of the 1 st opening hole 6c and the 1 st sealing part 11 in the 1 st direction is stabilized. Further, by sandwiching the convex portion 10d between the case 6 and the inverter case 8 in the 1 st direction, the relative position of the 2 nd opening hole 8c and the 2 nd groove portion 10f in the 1 st direction is stabilized. Therefore, the relative position of the 2 nd opening hole 8c and the 2 nd seal portion 12 in the 1 st direction is stabilized. Therefore, the 1 st seal part 11 and the 2 nd seal part 12 maintain the sealing function satisfactorily.

In addition, in the present embodiment, the bus bar 9 has the 2 nd extending portion 9b extending in a direction different from the 1 st extending portion 9a, and the bus bar 9 is bent inside the housing 6. Also, the bus bar 9 has a 3 rd extending portion extending in a different direction from the 1 st extending portion 9a and the 2 nd extending portion 9 b. Even if such a shape of the bus bar 9 is adopted, according to the present embodiment, the assembly of the motor unit 1 is easily performed. Further, since the convex portion 10d is provided in the bus bar support member 10, even when a force about a virtual axis (Y axis) extending in the 3 rd direction acts on the bus bar support member 10 via the bus bar 9 when the portion of the end portion of the bus bar 9 on the 1 st direction side other than the 1 st extending portion 9a is connected to another member, the bus bar support member 10 can be suppressed from rotating (tilting) about the virtual axis.

Further, in the case where the inverter case 8 and the motor housing 6a are disposed adjacent to each other in the radial direction of the motor axis J2 as in the present embodiment, the support structure of the bus bar 9 spanning these members tends to be complicated, but according to the present embodiment, the support structure of the bus bar 9 can be simplified, and the assembly of the motor unit can be facilitated.

In the present embodiment, the inverter case 8 and the motor housing portion 6a are adjacent to each other in the horizontal direction, and therefore the outer dimension of the motor unit 1 in the vertical direction (the direction of gravity) is kept small. Therefore, the motor unit 1 can be easily stored in a limited installation space such as a vehicle.

The present invention is not limited to the above-described embodiments, and structural modifications and the like can be made without departing from the scope of the present invention, as will be described below.

In the above-described embodiment, the protrusion 10g provided on the convex portion 10d is a rib, but is not limited thereto. The projection 10g may be a dot-like projection projecting in the 1 st direction from the end face of the projection 10d facing in the 1 st direction. Further, a plurality of protrusions 10g may be provided on the convex portion 10 d.

The 1 st seal portion 11 may not be an O-ring. The 1 st seal part 11 may be in a liquid state or a gel state. The 1 st sealing part 11 may be made of silicone resin. The 1 st seal part 11 may not be elastically deformable. The 1 st seal part 11 may be made of metal. The 1 st sealing part 11 and the bus bar supporting member 10 may be part of one member manufactured by two-color molding.

The 2 nd seal portion 12 may not be an O-ring. The 2 nd seal part 12 may be in a liquid state or a gel state. The 2 nd sealing part 12 may be made of silicone resin. The 2 nd seal portion 12 may not be elastically deformable. The 2 nd seal part 12 may be made of metal. The 2 nd sealing part 12 and the bus bar support member 10 may be part of one member manufactured by two-color molding.

In the above embodiment, the 2 nd seal portion 12 is disposed between the inner peripheral surface of the 2 nd open hole 8c and the outer peripheral surface of the bus bar support member 10 facing the inner peripheral surface, and is in contact with the inner peripheral surface of the 2 nd open hole 8c and the outer peripheral surface of the bus bar support member 10, but is not limited thereto. In the modification shown in fig. 8, a 1 st tube portion 6g extending from the wall portion 6e to the other side in the 1 st direction is provided in the wall portion 6e of the housing 6, and a 1 st opening hole 6c is arranged in the 1 st tube portion 6 g. Further, a 2 nd cylindrical portion 8f extending from the wall portion 8b to the 1 st direction side is provided in the wall portion 8b of the inverter case 8, and a 2 nd opening hole 8c is arranged in the 2 nd cylindrical portion 8 f. In fig. 8, assuming that the 1 st extending portion 9a of the bus bar 9 is the central axis, the 2 nd cylindrical portion 8f is disposed radially outward of the 1 st cylindrical portion 6 g. Further, the 2 nd cylindrical portion 8f and the 1 st cylindrical portion 6g are arranged to overlap each other when viewed in the radial direction. In this modification, the 2 nd seal portion 12 is disposed between the inner peripheral surface of the 2 nd open hole 8c and the outer peripheral surface of the 1 st tube portion 6g opposed to the inner peripheral surface, and contacts the inner peripheral surface of the 2 nd open hole 8c and the outer peripheral surface of the 1 st tube portion 6g to seal the peripheral surfaces. Even in this case, the penetration of foreign matter such as water from the outside of the inverter case 8 into the inside can be suppressed by the 2 nd seal portion 12. In the example shown in fig. 8, the housing 6 has a 2 nd groove portion 6h in a portion of the outer peripheral surface of the 1 st tube portion 6g which faces the inner peripheral surface of the 2 nd opening hole 8 c. The 2 nd seal part 12 is disposed in the 2 nd groove 6 h.

In the above embodiment, the adhesive is filled as the sealant between the through hole 10a of the bus bar supporting member 10 and the 1 st extending portion 9a of the bus bar 9, but the present invention is not limited thereto. The sealant may be a liquid or gel other than the adhesive as long as it has sealing properties. Further, although the plurality of through holes 10a are provided in the bus bar support member 10, only one through hole 10a may be provided in the bus bar support member 10. In this case, a plurality of 1 st extending portions 9a are inserted into the through-hole 10 a.

In addition, the respective configurations (constituent elements) described in the above-described embodiment, modification example, rewriting example, and the like may be combined, and addition, omission, replacement, and other changes of the configuration may be made, within a range not departing from the gist of the present invention. The present invention is not limited to the above-described embodiments, but is only limited by the claims.

Description of the reference symbols

1: a motor unit; 2: a motor; 6: a housing; 6 a: a motor storage section; 6 c: 1 st opening hole; 7: an inverter; 8: an inverter case; 8 c: 2 nd opening hole; 9: a bus bar; 9 a: 1 st extension part; 9 b: a 2 nd extension part; 10: a bus bar support member; 10 a: a through hole; 10 b: 1 st recess; 10 c: a 2 nd concave portion; 10 d: a convex portion; j2: a motor axis.

Claims (9)

1. A motor unit having:

a motor;

an inverter that supplies power to the motor;

a bus bar having a 1 st extending portion extending in a 1 st direction, the bus bar connecting the motor with the inverter;

a housing having a 1 st opening hole through which the 1 st extension part passes, the housing accommodating the motor;

an inverter case having a 2 nd opening hole opposed to the 1 st opening hole in the 1 st direction and through which the 1 st extension portion passes, the inverter case housing the inverter; and

a bus bar support member that supports the bus bar and that is inserted into the 1 st aperture and the 2 nd aperture so as to straddle the 1 st aperture and the 2 nd aperture,

the bus bar support member has a through hole penetrating the bus bar support member in the 1 st direction for inserting the 1 st extending portion therein,

a sealant is filled between the inner peripheral surface of the through hole and the 1 st extending portion,

the direction from the 2 nd opening hole to the 1 st opening hole in the 1 st direction is set as the 1 st direction side, the direction from the 1 st opening hole to the 2 nd opening hole is set as the 1 st direction side,

the bus bar support member has a 1 st recess recessed toward one side of the 1 st direction on an end surface of the bus bar support member facing the other side of the 1 st direction, and a 2 nd recess recessed toward the other side of the 1 st direction on an end surface of the bus bar support member facing the one side of the 1 st direction,

the through hole penetrates the bus bar support member in the 1 st direction from the bottom surface of the 1 st recess to the bottom surface of the 2 nd recess,

the bus bar is provided in plurality with a plurality of,

the bus bar support member has a plurality of the through holes and a plurality of the 2 nd recessed portions,

the end portions of the through holes on the 1 st direction side are open to the bottom surfaces of the 2 nd recesses,

the cross-sectional area of the 2 nd recess portion perpendicular to the 1 st direction is larger than the cross-sectional area of the through-hole perpendicular to the 1 st direction.

2. The motor unit according to claim 1,

the sealant is an adhesive.

3. The motor unit according to claim 1,

the bus bar is provided in plurality with a plurality of,

the bus bar support member has a plurality of the through holes,

the plurality of through holes open into 1 st recess.

4. The motor unit according to claim 3,

a plurality of the through holes are arranged in a direction perpendicular to the 1 st direction,

the 1 st recess is a groove extending in a direction in which the plurality of through holes are arranged.

5. The motor unit according to claim 1,

the depth of the 2 nd recess in the 1 st direction is deeper than the depth of the 1 st recess in the 1 st direction.

6. The motor unit according to any one of claims 1 to 5,

an outer peripheral surface of the bus bar support member is opposed to an inner peripheral surface of the 1 st opening hole and an inner peripheral surface of the 2 nd opening hole,

the bus bar support member has a convex portion protruding from an outer peripheral surface of the bus bar support member in a direction intersecting the 1 st direction,

the convex portion is disposed between the case and the inverter case in the 1 st direction, and is in contact with the case and the inverter case.

7. The motor unit according to any one of claims 1 to 5,

the bus bar has a 2 nd extending portion extending from the 1 st extending portion in a direction crossing the 1 st direction inside the housing.

8. The motor unit according to any one of claims 1 to 5,

the housing has a motor receiving portion receiving the motor,

a motor axis of the motor extends in a direction perpendicular to the 1 st direction,

the inverter case and the motor housing are disposed adjacent to each other in a radial direction of the motor axis.

9. The motor unit according to claim 8,

the inverter case is adjacent to the motor housing in a horizontal direction.

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