CN112840535B - Motor unit - Google Patents

Motor unit Download PDF

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Publication number
CN112840535B
CN112840535B CN201980062960.1A CN201980062960A CN112840535B CN 112840535 B CN112840535 B CN 112840535B CN 201980062960 A CN201980062960 A CN 201980062960A CN 112840535 B CN112840535 B CN 112840535B
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CN
China
Prior art keywords
motor
bus bar
inverter
axis
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201980062960.1A
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Chinese (zh)
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CN112840535A (en
Inventor
村田大辅
水谷真澄
福永庆介
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Nidec Corp
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Nidec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of CN112840535A publication Critical patent/CN112840535A/en
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Publication of CN112840535B publication Critical patent/CN112840535B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/12—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of electric gearing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Inverter Devices (AREA)
  • Motor Power Transmission Devices (AREA)

Abstract

One embodiment of the present invention is a motor unit mounted on a vehicle to drive the vehicle. The motor unit has: a main body part having a motor and a housing accommodating the motor; and an inverter unit having an inverter that supplies power to the motor and an inverter case that houses the inverter. The main body has a 1 st bus bar connected to a coil of the motor. The inverter unit has a 2 nd bus bar connected to the inverter, and the 2 nd bus bar is connected to the 1 st bus bar at a connection portion. The 1 st bus bar has: a terminal connection portion connected to the coil at an end portion of one side in an axial direction of the motor; a radial extension portion extending from the terminal connection portion to a radial outside of the motor; and an axial extension extending in the axial direction of the motor along an outer side surface of the motor from an end portion on a radially outer side of the radial extension. The 1 st bus bar has a plate shape in the axial extension in which the radial direction of the motor is the plate thickness direction.

Description

Motor unit
Technical Field
The present invention relates to a motor unit. The present application is based on japanese patent application No. 2018-185590, filed on 2018, 9, 28. This application claims priority to this application. The content of which is incorporated by reference in its entirety in the present application.
Background
In recent years, development of a driving device mounted on an electric vehicle has been actively performed. Patent document 1 describes a motor unit connected to a PDU (power drive unit) having an inverter.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2010-268633
Disclosure of Invention
Problems to be solved by the invention
The motor and the inverter are connected to each other via a conductive member called a bus bar. The bus bars are connected to the motor and the inverter, respectively, and are connected to each other at the final stage of the assembly process. In the conventional structure, workability in connecting the bus bars to each other is problematic.
In view of the above, an object of the present invention is to provide a motor unit capable of facilitating a connection process between bus bars connected to a motor and an inverter, respectively.
Means for solving the problems
One embodiment of the present invention is a motor unit mounted on a vehicle to drive the vehicle. The motor unit has: a main body part having a motor and a housing accommodating the motor; and an inverter unit having an inverter that supplies power to the motor and an inverter case that houses the inverter. The main body portion has a 1 st bus bar connected to a coil of the motor. The inverter unit has a 2 nd bus bar connected to the inverter, and the 2 nd bus bar is connected to the 1 st bus bar at a connection portion. The 1 st bus bar has: a terminal connection portion connected to the coil at an end portion of one side in an axial direction of the motor; a radial extension portion extending radially outward of the motor from the terminal connection portion; and an axial extension extending in the axial direction of the motor along an outer side surface of the motor from an end portion on a radially outer side of the radial extension. The 1 st bus bar has a plate shape in the axial extension in a plate thickness direction in a radial direction of the motor.
Effects of the invention
According to one aspect of the present invention, a motor unit is provided that can facilitate a process of connecting bus bars to each other, the bus bars being connected to a motor and an inverter, respectively.
Drawings
Fig. 1 is a conceptual diagram of a motor unit of an embodiment.
Fig. 2 is a perspective view of a motor unit of one embodiment.
Fig. 3 is an exploded perspective view of a motor unit of one embodiment.
Fig. 4 is an exploded perspective view of a motor unit of one embodiment.
Fig. 5 is a perspective view of the motor unit according to the embodiment, in which the housing is omitted.
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 drawings below, the actual structure may be different from the scale, the number, and the like in each structure for easy understanding of each structure.
In the following description, the gravity direction is defined based on the positional relationship in the case where the motor unit 10 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 indicates the vertical direction (i.e., the up-down direction), the +z direction is the upper side (the opposite side to the gravity direction), and the Z direction is the lower side (the gravity direction). The X-axis direction is a direction perpendicular to the Z-axis direction, and indicates a front-rear direction of a vehicle on which the motor unit 10 is mounted, and the +x direction is a vehicle front direction and the-X direction is a vehicle rear direction. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and indicates a width direction (left-right direction) of the vehicle, the +y-direction is a left direction of the vehicle, and the-Y-direction is a right direction of the vehicle.
In the following description, each direction will be described centering on the motor axis J1 of the motor 1. That is, the axial direction of the motor 1 centered on the motor axis J1 is simply referred to as the "axial direction", the radial direction of the motor 1 centered on the motor axis J1 is simply referred to as the "radial direction", and the circumferential direction of the motor 1 centered on the motor axis J1 is simply referred to as the "circumferential direction".
Fig. 1 is a conceptual diagram of a motor unit 10 of one embodiment. Fig. 2 is a perspective view of the motor unit 10.
The motor axis J1, the auxiliary axis J3, the output axis J4, and the rotation axis J6 described later are virtual axes which are not actually present.
The motor unit 10 is mounted on a vehicle, and drives the vehicle by rotating the wheels H. The motor unit 10 is mounted on an Electric Vehicle (EV), for example. The motor unit 10 may be mounted on a vehicle using a motor as a power source, such as a Hybrid Electric Vehicle (HEV) or a plug-in hybrid electric vehicle (PHV).
As shown in fig. 1, the motor unit 10 has a main body 9 and an inverter unit 8. The main body 9 includes a motor 1, a transmission mechanism (transmission shaft) 5, and a housing 6 that houses the motor 1 and the transmission mechanism 5.
(Shell)
The housing 6 is, for example, aluminum die-cast. The case 6 is configured by connecting a plurality of members arranged in the vehicle width direction. A housing space 6S for housing the motor 1 and the transmission mechanism 5 is provided inside the housing 6. The housing 6 holds the motor 1 and the transmission mechanism 5 in the storage space 6S. The housing space 6S is divided into a motor chamber 6A housing the motor 1 and a gear chamber 6B housing the transmission mechanism 5.
The housing 6 has: a motor housing 62 that houses the motor 1, with a motor chamber 6A provided therein; a gear housing 63 that houses the transmission mechanism 5, with a gear chamber 6B provided therein; and a partition wall portion 61 that divides the motor chamber 6A and the gear chamber 6B. The partition wall portion 61 is located between the motor housing portion 62 and the gear housing portion 63 in the axial direction.
(Motor)
The motor 1 is a motor generator having both a function as a motor and a function as a generator. The motor 1 mainly functions as an electric motor to drive the vehicle, and functions as a generator during regeneration.
The motor 1 has a rotor 31 and a stator 32 surrounding the rotor 31. The rotor 31 is rotatable about the motor axis J1. The stator 32 is annular. The stator 32 surrounds the rotor 31 from the radially outer side of the motor axis J1.
The rotor 31 is fixed to a motor drive shaft 11 described later. The rotor 31 rotates about the motor axis J1. The rotor 31 has a rotor core and rotor magnets held on the rotor core.
The stator 32 has a stator core and a coil 32a. The stator core has a plurality of teeth protruding radially inward of the motor axis J1. The coil 32a is wound around the teeth of the stator core.
The motor 1 is connected to an inverter 8a. The inverter 8a converts a direct current supplied from a battery, not shown, into an alternating current, and supplies the alternating current to the motor 1. The respective rotational speeds of the motor 1 are controlled by controlling the inverter 8a.
(transfer mechanism)
The transmission mechanism 5 transmits the power of the motor 1 and outputs the power from the output shaft 55. The transmission mechanism 5 incorporates a plurality of mechanisms for transmitting power between the drive source and the driven device.
The transmission mechanism 5 includes a motor drive shaft 11, a motor drive gear 21, a counter shaft 13, a counter shaft gear (large gear portion) 23, a drive gear (small gear portion) 24, a ring gear 51, an output shaft (axle) 55, and a differential device (differential gear) 50.
Each gear and each shaft of the transmission mechanism 5 can rotate about any one of the motor axis J1, the sub axis J3, and the output axis J4. In the present embodiment, the motor axis J1, the sub axis J3, and the output axis J4 extend parallel to each other. The motor axis J1, the sub axis J3, and the output axis J4 are parallel to the width direction of the vehicle. In the following description, the axial direction refers to the axial direction of the motor axis J1. That is, the axial direction refers to a direction parallel to the motor axis J1 and refers to the vehicle width direction.
The motor drive shaft 11 extends along a motor axis J1. The motor drive shaft 11 is fixed to the rotor 31. The motor drive shaft 11 is rotated by the motor 1. A motor drive gear 21 is fixed to the motor drive shaft 11.
The motor drive shaft 11 extends in the axial direction about the motor axis J1. The motor drive shaft 11 is a hollow shaft that opens on both axial sides of the motor axis J1. The outer shape of the motor drive shaft 11 as viewed in the axial direction is a cylindrical shape centered on the motor axis J1. The motor drive shaft 11 is bearing-supported rotatably about the motor axis J1. An output shaft 55 is provided inside the motor drive shaft 11.
The motor drive gear 21 is fixed to the motor drive shaft 11. The motor drive gear 21 rotates around the motor axis J1 together with the motor drive shaft 11.
The secondary shaft 13 extends along a secondary axis J3. The auxiliary shaft 13 rotates about the auxiliary axis J3. The counter shaft 13 is rotatably held by a housing (not shown) accommodating the transmission mechanism 5 via a bearing (not shown), for example. A counter gear 23 and a drive gear 24 are fixed to the counter shaft 13.
The counter gear 23 is fixed to the counter shaft 13. The counter gear 23 rotates together with the counter shaft 13 about the counter axis J3. The counter gear 23 meshes with the motor drive gear 21.
The drive gear 24 is fixed to the auxiliary shaft 13. The drive gear 24 rotates about the secondary axis J3 together with the counter shaft 13 and the counter shaft gear 23. The drive gear 24 is disposed on the opposite side of the motor 1 in the axial direction with respect to the counter gear 23.
The ring gear 51 is fixed to the differential device 50. The ring gear 51 rotates about the output axis J4. The ring gear 51 meshes with the drive gear 24. The ring gear 51 transmits the power of the motor 1 transmitted via the drive gear 24 to the differential device 50.
The differential device 50 is a device for transmitting torque output from the motor 1 to the wheels H of the vehicle. The differential device 5 has the following functions: when the vehicle turns, the same torque is transmitted to the left and right output shafts 55 while absorbing the speed difference between the left and right wheels H.
The differential device 50 has a gear housing (not shown) fixed to the ring gear 51, a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown). The gear housing rotates together with the ring gear 51 about the output axis J4. The gear housing houses a pair of pinion gears, a pinion shaft, and a pair of side gears. The pair of pinion gears are bevel gears facing each other. A pair of pinion gears are supported on the pinion shaft. The pair of side gears are bevel gears that mesh perpendicularly with the pair of pinion gears. A pair of side gears are fixed to the output shaft 55, respectively.
The output shaft 55 rotates about the output axis J4. In the motor unit 10, a pair of output shafts 55 are provided. A pair of output shafts 55 are connected at one end portion respectively to side gears of the differential device 50. That is, the output shaft 55 is connected to the ring gear 51 via the differential device 50. The power of the motor 1 is transmitted to the output shaft 55 via each gear. In addition, a pair of output shafts 55 protrude to the outside of the housing 6 at the other end portions, respectively. A wheel H is mounted on the other end of the output shaft 55. The output shaft 55 outputs power to the outside (to the road surface via the wheels H).
In the present embodiment, the output axis J4 coincides with the motor axis J1. One of the pair of output shafts 55 passes through the inside of the motor drive shaft 11 as a hollow shaft. Therefore, the motor unit 10 of the present embodiment can be miniaturized in the radial direction of the motor axis J1 as compared with a motor unit having a structure in which the motor axis J1 and the output axis J4 are not coaxially arranged.
(inverter unit)
As shown in fig. 2, the inverter unit 8 has an inverter 8a and an inverter case 8b that houses the inverter 8a. The inverter 8a supplies electric power to the motor 1. Although not shown, the inverter unit 8 further includes a circuit board and a capacitor.
Fig. 3 and 4 are exploded perspective views of the motor unit 10, and are views showing the inverter unit 8 separated from the main body 9. In fig. 3 and 4, the perspective directions of the motor unit 10 are different from each other.
The inverter unit 8 has a substantially rectangular shape when viewed from the up-down direction. The inverter unit 8 is fixed to the upper surface 6a of the housing 6. More specifically, the inverter unit 8 is fixed to the upper surface 6a of the motor housing 62 of the housing 6 in the inverter housing 8b. A notch surface cut along the lower surface of the inverter unit 8 is provided at substantially the center of the upper surface 6a. The upper surface 6a faces the lower surface of the inverter unit 8 in the vertical direction with a gap therebetween. This suppresses transmission of the vibration of the case 6 to the inverter unit 8, and enables the inverter unit 8 to be excited.
In the present specification, the upper surface 6a of the housing 6 refers to the entire surface facing upward of the outer surface of the housing 6. The case 6 is opposed to the lower surface of the inverter unit 8 at the upper surface 6a.
The inverter unit 8 is located directly above the motor 1. That is, the inverter unit 8 is located above the motor 1 and overlaps the motor 1 when viewed from the vertical direction. As a result, the size of the motor unit 10 in the vehicle longitudinal direction can be reduced compared to the case where the inverter unit 8 is disposed in the vehicle longitudinal direction with respect to the motor 1.
In general, the projection area of the motor housing portion 62 in the axial direction is smaller than the projection area of the gear housing portion 63 in the axial direction. According to the present embodiment, since the inverter unit 8 is disposed radially outward of the motor housing 62, it is easy to dispose the inverter unit 8 and the gear housing 63 so as to overlap each other when viewed in the axial direction. This reduces the projected area of the entire motor unit 10 in the axial direction, thereby enabling the motor unit 10 to be miniaturized.
At least a part of the inverter unit 8 overlaps the counter gear 23 as viewed in the axial direction. By disposing the inverter unit 8 and the counter gear 23 so as to overlap each other, the projected area of the motor unit 10 in the axial direction can be reduced, and the motor unit 10 can be miniaturized.
As shown in fig. 3 and 4, the inverter unit 8 is fixed to the housing 6 of the motor unit 10 in a plurality of fixing portions 40, 45. The plurality of fixing portions 40, 45 are classified into a 1 st fixing portion 40 (see fig. 3) and a 2 nd fixing portion 45 (see fig. 4). The 1 st fixing portion 40 is located on the vehicle front side with respect to the motor axis J1, and the 2 nd fixing portion 45 is located on the vehicle rear side with respect to the motor axis J1.
As shown in fig. 3, the 1 st fixing portion 40 includes an eave portion 42 provided on the inverter unit 8, an opposing surface 43 provided on the case 6, and a fixing bolt 41.
The eave portion 42 of the 1 st fixing portion 40 protrudes in the horizontal direction at the outer side surface of the inverter case 8b of the inverter unit 8. The eave portion 42 is provided with a through hole 42a penetrating in the vertical direction.
The facing surface 43 of the 1 st fixing portion 40 faces the eave portion 42 in the up-down direction. In the present embodiment, the facing surface 43 is provided on the housing 6 located on the lower side of the inverter unit 8. Therefore, in the present embodiment, the opposing surface 43 of the 1 st fixing portion 40 faces upward. The facing surface 43 is provided with a screw hole 43a extending in the vertical direction and opening on the eave 42 side (i.e., upper side).
The fixing bolt 41 of the 1 st fixing portion 40 is screwed into the screw hole 43a of the facing surface 43 through the through hole 42a of the eave portion 42. Thereby, the lower surface of the eave 42 contacts the facing surface 43, and the inverter unit 8 and the case 6 are fixed to each other.
As shown in fig. 4, the 2 nd fixing portion 45 includes an eave portion 47 provided on the case 6, an opposing surface 48 provided on the inverter unit 8, and a fixing bolt 46.
The eave portion 47 of the 2 nd fixing portion 45 protrudes in the horizontal direction at the outer side surface of the motor housing portion 62 of the housing 6. The eave portion 47 is provided with a through hole 47a penetrating in the vertical direction.
The facing surface 48 of the 2 nd fixing portion 45 faces the eave portion 47 in the up-down direction. In the present embodiment, the facing surface 48 is provided on the inverter unit 8 located on the upper side of the housing 6. Therefore, in the present embodiment, the facing surface 48 of the 2 nd fixing portion 45 is directed downward. The facing surface 48 is provided with a screw hole 48a extending in the vertical direction and opening on the eave portion 47 side (i.e., the lower side).
The fixing bolt 46 of the 2 nd fixing portion 45 is screwed into the screw hole 48a of the facing surface 48 via the through hole 47a of the eave portion 47. As a result, the upper surface of the eave 47 contacts the facing surface 48, and the inverter unit 8 and the case 6 are fixed to each other.
The 1 st fixing portion 40 and the 2 nd fixing portion 45 are disposed on opposite sides with respect to the motor axis J1 when viewed from the up-down direction. The eaves 42 and 47 of the 1 st fixing portion 40 and the 2 nd fixing portion 45 extend away from the motor axis J1 when viewed in the vertical direction.
According to the present embodiment, the eave portion 42 of the 1 st fixing portion 40 and the eave portion 47 of the 2 nd fixing portion 45, which are located on opposite sides of each other with respect to the motor axis J1, are provided separately to the inverter unit 8 and the housing 6, respectively. Therefore, the motor unit 10 can be made smaller in the vehicle longitudinal direction than in the case where all of the eaves are provided in either the inverter unit 8 or the housing 6.
(connection Structure of Motor and inverter)
Next, an electrical connection structure between the motor 1 and the inverter 8a will be described. The motor 1 and the inverter 8a are connected via bus bars 71 and 72.
Fig. 5 is a perspective view of the motor unit 10 with the housing 6 omitted.
The main body 9 has 31 st bus bars 71 and 1 st bus bar holders 76. In fig. 5, the 1 st bus bar holder 76 is indicated by a broken line. On the other hand, the inverter unit 8 has 32 nd bus bars 72 and 2 nd bus bar holders 77.
The 1 st bus bar 71 and the 2 nd bus bar 72 have a plate shape. The 1 st bus bar 71 is connected to the coil 32a of the motor 1. On the other hand, the 2 nd bus bar 72 is connected to the inverter 8a. The 1 st bus bar 71 and the 2 nd bus bar 72 are connected to each other at a connection portion 79. The connection 79 is located inside the housing 6. The motor 1 and the inverter 8a are electrically connected via the 1 st bus bar 71 and the 2 nd bus bar 72.
The 31 st bus bars 71 are held on the 1 st bus bar holder 76. The 31 st bus bars 71 are buried into the 1 st bus bar holder 76 by insert molding. The 1 st bus bar 71 and the 1 st bus bar holder 76 are disposed in a motor chamber 6A (see fig. 1) inside the housing 6.
The 1 st bus bar 71 has a terminal connection portion 71a, a radial extension portion 71b, an axial extension portion 71c, and a circumferential extension portion 71d.
The terminal connection portion 71a is located on one axial side (+y side) of the motor 1. The terminal connection portion 71a is connected to the coil 32a of the motor 1. The coil 32a has a pair of coil end portions 32b protruding from the stator core to one side in the axial direction. From the coil end 32b on one axial side of the pair of coil ends 32b, a coil end 32c bundling wires corresponding to the U-phase, V-phase, and W-phase extends. A crimp terminal is attached to the tip of the coil end 32c.
The terminal connection portion 71a is connected to the crimp terminal of the coil end 32c. That is, the terminal connection portion 71a is connected to the coil 32a at one end in the axial direction of the motor 1. The crimp terminal of the terminal connection portion 71a and the coil end 32c is fastened by a screw 78.
The terminal connection portion 71a extends in the axial direction. The coil end 32c extends from the coil end 32b to one axial side. The terminal connection portion 71a extends in the axial direction, so that the coil end 32c does not need to be bent when connecting the coil end 32c and the terminal connection portion 71 a. Therefore, the connection process of the coil end 32c and the terminal connection portion 71a becomes easy. In addition, in a state where the coil end 32c is connected to the terminal connection portion 71a, the application of load to the coil end 32c can be suppressed.
The 1 st bus bar 71 has a plate thickness direction in the terminal connection portion 71a in the radial direction. More specifically, the direction parallel to the direction perpendicular to the tangential direction is referred to as the plate thickness direction. Therefore, the terminal connection portion 71a can be made to extend along the coil end 32c from the radially outer side. This facilitates the connection process between the coil end 32c and the terminal connection portion 71 a.
The terminal connection portions 71a of the 31 st bus bars 71 are arranged in the circumferential direction. Therefore, the 3 terminal connection portions 71a do not overlap each other when viewed in the radial direction. Therefore, the connection work can be simplified by performing the work of connecting the terminal connection portion 71a and the coil end 32c from the radially outer side.
The radial extension 71b is located on one axial side of the motor 1. The radially extending portion 71b extends radially outward from the terminal connecting portion 71 a. That is, the radially extending portion 71b is connected to the terminal connecting portion 71 a. The 1 st bus bar 71 is bent in the plate thickness direction at the boundary portion between the terminal connection portion 71a and the radial extension portion 71 b. The radially outer end of the radially extending portion 71b is located radially outward of the stator 32 as viewed in the axial direction.
The 1 st bus bar 71 has a plate thickness direction in the radial extension portion 71b in the axial direction. Therefore, the dimension of the radially extending portion 71b in the axial direction can be reduced. As a result, the region of the housing 6 in which the radially extending portion 71b is housed in the motor chamber 6A can be miniaturized in the axial direction, and the housing 6 can be miniaturized.
The axial extension 71c extends in the axial direction along the outer side surface of the motor 1 from the radially outer end of the radial extension 71 b. The axial extension 71c is located radially outward of the stator 32. In addition, the axial position of the axial extension 71c overlaps with the axial position of the stator 32.
The axial extension 71c has a 1 st end 71ca on one side in the axial direction and a 2 nd end 71cb on the opposite side (i.e., the other side in the axial direction) of the 1 st end 71 ca. The axial extension 71c is connected to the radial extension 71b at the 1 st end 71 ca. The 1 st bus bar 71 is bent in the plate thickness direction at the boundary portion between the radial extension portion 71b and the axial extension portion 71c.
The 1 st bus bar 71 has a plate thickness direction in the axial extension 71c in the radial direction. Therefore, the dimension of the axial extension 71c in the radial direction can be reduced. As a result, the region of the housing 6 in which the axial extension 71c is housed in the motor chamber 6A can be miniaturized in the radial direction, and the housing 6 can be miniaturized.
The circumferential extension 71d extends in the circumferential direction from the 2 nd end 71cb of the axial extension 71c. In the present embodiment, the circumferential extension 71d extends upward (i.e., toward the inverter unit 8) from the axial extension 71c. The 1 st bus bar 71 has a plate thickness direction in the radial direction in the circumferential extension portion 71d. The plate thickness direction of the circumferential extension portion 71d coincides with the plate thickness direction of the axial extension portion 71c. The 1 st bus bar 71 is bent in a direction perpendicular to the plate thickness direction at a boundary portion of the circumferential extension portion 71d and the axial extension portion 71c.
The circumferential extension 71d has a 1 st connection end 71da located on the opposite side of the axial extension 71c. The 1 st bus bar 71 is connected to the 2 nd bus bar 72 at the 1 st connection end 71da of the circumferential extension portion 71d. That is, the connection portion 79 is located at the circumferentially extending portion 71d. The 1 st connection ends 71da of the 31 st bus bars 71 are arranged in the axial direction.
According to the present embodiment, the 1 st bus bar 71 has a terminal connection portion 71a, a radial extension portion 71b, and an axial extension portion 71c. The 1 st bus bar 71 is routed from one axial side of the motor 1 to a position along the outer side surface of the motor 1. Thereby, the 1 st bus bar 71 can be led to the vicinity of the inverter unit 8 disposed around the motor 1. As a result, the connection between the 1 st bus bar 71 and the 2 nd bus bar 72 can be facilitated.
According to the present embodiment, the 1 st bus bar 71 has the circumferential extension portion 71d, and the 1 st connection end 71da connected to the 2 nd bus bar 72 can be disposed on one circumferential side. That is, according to the present embodiment, the 1 st connection end 71da of the 1 st bus bar 71 can be disposed close to the inverter unit 8. As described later, the 2 nd bus bar 72 extends so as to protrude from the lower surface of the inverter case 8b. By disposing the 1 st connection end 71da of the 1 st bus bar 71 close to the inverter unit 8, the protruding length of the 2 nd bus bar 72 can be shortened. If the protruding length of the 2 nd bus bar 72 is too long, the 2 nd bus bar 72 may interfere with other members and deform in the assembly process of the inverter unit 8 and the main body portion 9. According to the present embodiment, the protruding length of the 2 nd bus bar 72 is shortened, so that the handling of the bus bar unit in the assembly process can be facilitated.
The 3 nd bus bars 72 are held on the 2 nd bus bar holder 77. The 2 nd bus bar holder 77 has a rectangular shape with an axial direction as a longitudinal direction and bent at a corner when viewed in the axial direction. The 2 nd bus bar holder 77 is provided with through holes (not shown) penetrating in the up-down direction to allow the 2 nd bus bar 72 to be inserted therein. The lower end (the 2 nd connection end 72 b) of the 2 nd bus bar holder 77 protrudes from the 2 nd bus bar holder 77 to be exposed.
A seal (not shown) is provided on the outer peripheral surface of the 2 nd bus bar holder 77 in the horizontal direction. As described later, the 2 nd bus bar holder 77 is inserted into an opening hole 6h provided in the housing 6. The seal suppresses the penetration of moisture between the outer peripheral surface of the 2 nd bus bar holder 77 and the inner peripheral surface of the opening hole 6h.
The 2 nd bus bar 72 protrudes downward from the lower surface of the inverter case 8b. The 2 nd bus bar 72 extends to the inside of the housing 6, and is connected to the 1 st bus bar 71 at a connection portion 79. The 2 nd bus bar 72 has a plate shape. The 2 nd bus bar 72 has a radial direction as a plate thickness direction. The plate thickness direction of the 2 nd bus bar 72 coincides with the plate thickness direction of the circumferential extension portion 71d of the 1 st bus bar 71. The 32 nd bus bars 72 are arranged along the axial direction.
A 2 nd connection end 72b is provided at a lower end portion of the 2 nd bus bar 72. The 2 nd bus bar 72 is connected to the 1 st bus bar 71 at a 2 nd connection end 72b. The 32 nd connection ends 72b are arranged in the axial direction.
The connection portion 79 has 3 connection bolts 79a. The 1 st connection end 71da of the 1 st bus bar 71 and the 2 nd connection end 72b of the 2 nd bus bar 72 are fixed to each other at the connection portion 79 by a connection bolt 79a. A cross-shaped groove is provided at the head of the connecting bolt 79a. The connection bolt 79a is rotated by a tool (e.g., a cross screw driver) to fasten the 1 st bus bar 71 and the 2 nd bus bar 72.
As shown in fig. 3, an opening hole 6h for allowing the inside and outside of the housing 6 to communicate is provided in the upper surface 6a of the housing 6. The opening hole 6h penetrates the outer side surface of the housing 6 in the up-down direction and opens at the upper side.
The 32 nd bus bars 72, and the 2 nd bus bar holder 77 are inserted into the opening holes 6h of the housing 6. The 2 nd bus bar holder 77 protrudes from the lower surface of the inverter unit 8 and extends to the inside of the housing 6.
A window 6w for communicating the inside and the outside of the housing 6 is provided on the radially outward side surface of the housing 6. The window 6w radially penetrates the motor housing 62 of the housing 6, and is radially opened. The window 6w is located directly below the opening 6h. That is, the axial position of the window 6w overlaps the axial position of the opening hole 6h. The opening direction of the window 6w is perpendicular to the opening direction of the opening hole 6h. The window portion 6w is located radially outward of the connection portion 79. The window portion 6w overlaps the connection portion 79 when viewed in the radial direction. Thus, the window portion 6w exposes the connection portion 79.
The window 6w is covered with a cover member 6c. That is, the case 6 has a cover member 6c covering the window 6w. The cover member 6c is screwed to the outer surface of the case 6 using screws, not shown. The lid member 6c has a plate shape with the opening direction of the window portion 6w as the plate thickness direction.
According to the present embodiment, the window 6w exposing the connection portion 79 is provided on the outer side surface of the case 6. Therefore, the operator can insert a tool (in the present embodiment, a cross screw driver) into the housing 6 from the window portion 6w, and connect the 1 st bus bar 71 and the 2 nd bus bar 72 to each other at the connection portion 79. That is, according to the present embodiment, the connection process of the 1 st bus bar 71 and the 2 nd bus bar 72 can be easily performed.
According to the present embodiment, the window 6w is radially opened on the outer side surface of the housing 6. Therefore, the window portion 6w can be disposed close to the connection portion 79. As a result, the window 6w can be easily moved to the connection portion 79, and the connection operation between the 1 st bus bar 71 and the 2 nd bus bar 72 by the operator can be further facilitated.
According to the present embodiment, the 1 st bus bar 71 and the 2 nd bus bar 72 extend in the circumferential direction along the outer side surface of the motor 1 at the connecting portion 79. As a result, the connecting portion 79 can be disposed so as to be close to the window portion 6w that is open in the radial direction, and the connection portion 79 can be easily accessed from the window portion 6w.
According to the present embodiment, the plate thickness direction in the connection portion 79 of the 1 st bus bar 71 and the 2 nd bus bar 72 coincides with the opening direction of the window portion 6w. Therefore, when the 1 st bus bar 71 and the 2 nd bus bar 72 are fastened to each other from the plate thickness direction and fixed, the fixing operation of the 1 st bus bar 71 and the 2 nd bus bar 72 can be facilitated. More specifically, in the present embodiment, the connection bolt 79a of the connection portion 79 extends along the opening direction of the window portion 6w. Therefore, the 1 st bus bar 71 and the 2 nd bus bar 72 can be easily fastened by the operator inserting the tool from the window portion 6w.
While the embodiments and modifications of the present invention have been described above, the structures and combinations thereof in the embodiments and modifications are examples, and the structures may be added, omitted, substituted, and other modified without departing from the spirit of the present invention. The present invention is not limited to the embodiments.
For example, in the present embodiment, a case where the 1 st bus bar is constituted by a single member is described. However, the 1 st bus bar may be constituted by a plurality of members. As an example, the 1 st bus bar may have a structure in which the 1 st member and the 2 nd member have a terminal connection portion, a radially extending portion, and an axially extending portion 71c, and the 1 st member and the 2 nd member are connected to each other, and the 2 nd member has a circumferentially extending portion 71d.
Description of the reference numerals
1: a motor; 5: a transmission mechanism; 6: a housing; 6a: an upper surface; 6c: a cover member; 6h: an opening hole; 6w: a window portion; 8: an inverter unit; 8a: an inverter; 8b: an inverter case; 9: a main body portion; 10: a motor unit; 11: a motor drive shaft; 13: a secondary shaft; 21: a motor drive gear; 23: a countershaft gear; 24: a drive gear; 32a: a coil; 51: a gear ring; 55: an output shaft; 71: a 1 st bus bar; 71a: a terminal connection portion; 71b: a radial extension; 71c: an axial extension; 71ca: a 1 st end; 71cb: a 2 nd end; 71d: a circumferential extension; 72: a 2 nd bus bar; 79: a connection part; 79a: a connecting bolt; j1: a motor axis; j3: a secondary axis; j4: an output axis.

Claims (5)

1. A motor unit mounted on a vehicle to drive the vehicle, wherein,
the motor unit includes:
a main body part having a motor and a housing accommodating the motor; and
an inverter unit having an inverter for supplying power to the motor and an inverter case for housing the inverter,
the main body portion has a 1 st bus bar connected to a coil of the motor,
the inverter unit has a 2 nd bus bar connected with the inverter, the 2 nd bus bar being connected with the 1 st bus bar at a connection portion,
the 1 st bus bar has:
a terminal connection portion connected to the coil at an end portion of one side in an axial direction of the motor;
a radial extension portion extending radially outward of the motor from the terminal connection portion; and
an axial extension extending in the axial direction of the motor from an end portion on a radially outer side of the radial extension along an outer side surface of the motor,
the 1 st bus bar has a plate shape in the axial extension in a plate thickness direction in a radial direction of the motor,
the terminal connection portion and the radially extending portion overlap the motor in the axial direction,
the axial extension has a 1 st end connected to the radial extension and a 2 nd end on an opposite side of the 1 st end,
the 1 st bus bar has a circumferential extension extending from the 2 nd end of the axial extension along the circumferential direction of the motor,
the connecting portion is located at the circumferentially extending portion,
the 1 st bus bar is provided with a plurality of circumferentially extending parts which are arranged along the axial direction.
2. The motor unit according to claim 1, wherein,
the connecting portion is located inside the housing,
the housing is provided with a window portion that opens in a radial direction of the motor to expose the connection portion.
3. The motor unit according to claim 2, wherein,
an opening hole for communicating the inside and the outside of the shell is arranged on the shell,
the 2 nd bus bar protrudes from the inverter case and is inserted into the opening hole.
4. The motor unit according to claim 1, wherein,
the main body part has a transmission mechanism which is accommodated in the housing, transmits power of the motor and outputs the power from an output shaft,
the transmission mechanism includes:
a motor drive shaft extending along a motor axis, rotated by the motor;
a motor drive gear fixed to the motor drive shaft for rotation about the motor axis;
a minor axis extending along a minor axis;
a counter gear fixed to the counter shaft, meshed with the motor drive gear, and rotated around the counter shaft;
a drive gear fixed to the auxiliary shaft and rotatable around the auxiliary shaft;
a ring gear engaged with the drive gear and rotating about an output axis; and
the output shaft is connected with the gear ring and rotates around the output axis,
the motor axis, the secondary axis and the output axis extend parallel to each other,
the motor drive shaft is a hollow shaft open on both sides in the axial direction of the motor axis,
the output shaft is connected to the inside of the motor drive shaft.
5. The motor unit according to claim 4, wherein,
the inverter unit is located directly above the motor,
at least a portion of the inverter unit overlaps with a counter gear when viewed from an axial direction of the motor axis.
CN201980062960.1A 2018-09-28 2019-09-26 Motor unit Active CN112840535B (en)

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WO2023243276A1 (en) * 2022-06-13 2023-12-21 ジヤトコ株式会社 Unit
CN117318400A (en) * 2022-06-20 2023-12-29 法雷奥西门子新能源汽车德国有限责任公司 Electric drive assembly, vehicle and method for assembling an electric drive assembly
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