WO2021166298A1 - Unité de moteur - Google Patents

Unité de moteur Download PDF

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Publication number
WO2021166298A1
WO2021166298A1 PCT/JP2020/034765 JP2020034765W WO2021166298A1 WO 2021166298 A1 WO2021166298 A1 WO 2021166298A1 JP 2020034765 W JP2020034765 W JP 2020034765W WO 2021166298 A1 WO2021166298 A1 WO 2021166298A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
axial direction
stator
shaft
gear
Prior art date
Application number
PCT/JP2020/034765
Other languages
English (en)
Japanese (ja)
Inventor
勇樹 石川
直大 和田
泰伸 熊谷
Original Assignee
日本電産株式会社
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
Application filed by 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN202080096975.2A priority Critical patent/CN115136470A/zh
Priority to DE112020006735.1T priority patent/DE112020006735T5/de
Publication of WO2021166298A1 publication Critical patent/WO2021166298A1/fr

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Classifications

    • 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
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
    • 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
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H2057/02034—Gearboxes combined or connected with electric machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
    • 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

Definitions

  • the present invention relates to a motor unit.
  • the present application claims priority based on Japanese Patent Application No. 2020-0216149 filed on February 19, 2020, the contents of which are incorporated herein by reference.
  • Patent Document 1 describes a motor-type power unit (motor unit) that has been miniaturized by passing an output shaft inside a hollow shaft.
  • One aspect of the present invention is to provide a motor unit that can simplify the assembly process.
  • One aspect of the motor unit of the present invention is a rotor having a motor shaft that rotates about a motor axis, a motor having a stator located radially outside the rotor, and a first bearing that supports the motor shaft.
  • a stator holder for holding the stator, and a housing body for accommodating the motor and the stator holder.
  • the stator holder has a cylindrical portion that surrounds the stator from the outside in the radial direction, and a bottom plate portion that extends radially inward from one end of the cylindrical portion in the axial direction.
  • the housing body has an inner peripheral surface facing the outer peripheral surface of the cylindrical portion in the radial direction.
  • a passage portion for passing a refrigerant is provided between the outer peripheral surface of the cylindrical portion and the facing inner peripheral surface.
  • the bottom plate portion holds the first bearing.
  • a motor unit that can simplify the assembly process.
  • FIG. 1 is a conceptual diagram of a motor unit of one embodiment.
  • FIG. 2 is a perspective view of the motor unit of one embodiment.
  • FIG. 3 is an exploded perspective view of a shaft holding portion of the motor unit of one embodiment.
  • FIG. 4 is a schematic view of the oil pump of the motor unit of one embodiment.
  • FIG. 1 is a conceptual diagram of the motor unit 10.
  • FIG. 2 is a perspective view of the motor unit 10.
  • the direction of gravity will be defined based on the positional relationship when the motor unit 10 is mounted on a vehicle located on a horizontal road surface.
  • the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate.
  • the Z-axis direction indicates the vertical direction (that is, the vertical direction), the + Z direction is the upper side (opposite the gravity direction), and the ⁇ Z direction is the lower side (gravity direction). Therefore, in the present specification, the term "upper side” means the upper side with respect to the direction of gravity.
  • the X-axis direction is orthogonal to the Z-axis direction and indicates the front-rear direction of the vehicle on which the motor unit 10 is mounted.
  • the + X direction is the front of the vehicle
  • the ⁇ X direction is the rear of the vehicle.
  • the Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and indicates the width direction (left-right direction) of the vehicle, the + Y direction is the vehicle left side, and the -Y direction is the vehicle right side. Is.
  • the direction parallel to the motor axis J1 of the motor 1 is simply referred to as "axial direction”.
  • the direction on the + Y side in the axial direction is referred to as the other side in the axial direction, and the ⁇ Y side is referred to as the one side in the axial direction.
  • the radial direction centered on the motor axis J1 is simply called the "diameter direction”
  • the circumferential direction centered on the motor axis J1 that is, the circumference of the motor axis J1 is simply called the "circumferential direction”.
  • the motor axis J1 and the counter axis J3 described later are virtual axes that do not actually exist.
  • the motor unit 10 is mounted on the vehicle and rotates the wheels H to move the vehicle forward or backward.
  • the motor unit 10 is mounted on, for example, an electric vehicle (EV).
  • EV electric vehicle
  • the motor unit 10 may be mounted on a vehicle powered by a motor, such as a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHV).
  • HEV hybrid electric vehicle
  • PHYV plug-in hybrid electric vehicle
  • the motor unit 10 includes a motor 1, a gear portion 5, an inverter 8, a housing 6 accommodating the motor 1, the gear portion 5 and the inverter 8, and a shaft holding a shaft in the housing 6. It includes a holding portion 80, a stator holder 40 that holds the stator 35 of the motor 1 in the housing 6, and oil O.
  • the housing 6 is made of, for example, aluminum die-cast.
  • the housing 6 is located below the housing body 60, the closing member 67 located on the other side (+ Y side) of the housing body 60 in the axial direction, the inverter cover 68 located on the upper side of the housing body 60, and the housing body 60. It has a bottom lid member 69 and the like. That is, the motor unit 10 has a housing body 60, a closing member 67, an inverter cover 68, and a bottom lid member 69.
  • the housing 6 is configured by fastening the housing body 60, the closing member 67, the inverter cover 68, and the bottom lid member 69 to each other.
  • the housing body 60 is provided with a drive body accommodating space 61, an inverter accommodating space 62, and an oil storage space 63.
  • the inverter accommodating space 62 is arranged on the upper side of the drive body accommodating space 61, and the oil storage space 63 is arranged on the lower side.
  • the drive body accommodating space 61 is a connected space accommodating the motor 1, the gear portion 5, the shaft holding portion 80, the stator holder 40, and the oil O.
  • the inverter accommodating space 62 is a space accommodating the inverter 8.
  • the oil storage space 63 is a space for storing the oil O circulating in the drive body accommodating space 61. In this way, the housing body 60 accommodates the motor 1, the gear portion 5, the shaft holding portion 80, the stator holder 40, the inverter 8, and the oil O in each space.
  • a communication hole 65 connected to the oil storage space 63 is provided on the lower wall surface of the drive body accommodating space 61.
  • the oil O in the lower region of the drive body accommodating space 61 flows into the oil storage space 63 through the communication hole 65. Oil O is accumulated in the lower region of the drive body accommodating space 61 and the oil storage space 63.
  • Oil O circulates in the oil passage 90 provided in the housing 6.
  • the oil O functions not only as a lubricating oil for lubricating the gear portion 5 but also as a cooling oil for cooling the motor 1.
  • As the oil O it is preferable to use an oil equivalent to a low-viscosity lubricating oil for automatic transmission (ATF: Automatic Transmission Fluid).
  • a part of the ring gear 51, which will be described later, of the gear portion 5 is immersed in the oil O that collects in the lower region of the drive body accommodating space 61.
  • the oil O is scooped up by the operation of the ring gear 51 and diffused into the drive body accommodating space 61.
  • the oil O diffused in the drive body accommodating space 61 is supplied to each gear of the gear portion 5 in the drive body accommodating space 61, and the oil O is distributed to the tooth surfaces of the gears.
  • the oil O supplied to the gear portion 5 and used for lubrication is dropped and collected in the lower region of the drive body accommodating space 61.
  • the housing body 60 has a first opening 61a that exposes the drive body accommodation space 61 to the other side (+ Y side) in the axial direction, a second opening 62a that exposes the inverter accommodation space 62 upward, and an oil storage space. It has a third opening 63a that exposes the 63 downwards.
  • the first opening 61a is covered with the closing member 67.
  • the second opening 62a is covered with the inverter cover 68.
  • the third opening 63a is covered by the bottom lid member 69.
  • the housing body 60 is radially extended from an opening of a tubular portion 60a centered on the motor axis J1, a bottom portion 60b covering one axial side of the tubular portion 60a, and an opening on the other axial direction of the tubular portion 60a. It has an expansion portion 60c, a box-shaped portion 60d arranged on the upper side of the tubular portion 60a, and a storage wall portion 60e located on the lower side of the tubular portion 60a.
  • the box-shaped portion 60d surrounds the inverter accommodating space 62.
  • the box-shaped portion 60d has a second opening 62a.
  • the storage wall portion 60e surrounds the oil storage space 63.
  • the storage wall portion 60e has a third opening 63a.
  • the tubular portion 60a surrounds the motor 1 from the outside in the radial direction.
  • the bottom portion 60b is located on one side ( ⁇ Y side) of the motor 1 in the axial direction.
  • the bottom portion 60b has a bearing holding portion 60ba that holds the ball bearing 71.
  • the bottom 60b supports the output shaft 55 via a ball bearing 71.
  • the bottom 60b supports the oil pump 96.
  • the expansion portion 60c faces the closing member 67 in the axial direction.
  • the expansion portion 60c includes an overhanging portion 60ca extending from the opening of the tubular portion 60a along a plane orthogonal to the axial direction, and an outer edge portion 60cc extending from the overhanging portion 60ca toward the other side (+ Y side) in the axial direction.
  • the closing member 67 is fastened to the outer edge portion 60cc by using a fastening member such as a bolt.
  • the closing member 67 covers the first opening 61a.
  • the closing member 67, the tubular portion 60a, the bottom portion 60b, and the expansion portion 60c of the housing body 60 surround the drive body accommodating space 61. Therefore, by separating the closing member 67 from the housing body 60, the drive body accommodating space 61 is exposed to the other side in the axial direction.
  • the shape of the closing member 67 is a concave shape that opens on one side ( ⁇ Y side) in the axial direction.
  • the closing member 67 supports the counter shaft 13, which will be described later, via the ball bearing 79. Further, the closing member 67 rotatably supports the gear housing 52 and the ring gear 51, which will be described later, via the conical roller bearing 77.
  • the first opening 61a of the housing body 60 accommodates the motor 1, the gear portion 5, the shaft holding portion 80, and the stator holder 40 in the drive body accommodating space 61 on the other side (+ Y side) in the axial direction. ).
  • the motor 1, the gear portion 5, the shaft holding portion 80, and the stator holder 40 are assembled inside the housing body 60 from the first opening 61a.
  • the assembly process of the motor unit 10 is performed by sequentially assembling the motor 1, the gear portion 5, and the like inside the housing body 60.
  • the posture of the housing body 60 is changed according to the assembling direction of each member.
  • the procedure for changing the posture of the housing body 60 lengthens the working time of the assembly process.
  • the motor 1, the gear portion 5, the shaft holding portion 80, and the stator holder 40 can be assembled to the housing body 60 from one direction, thereby simplifying the assembling process and performing assembling. The required cost can be reduced.
  • the housing main body 60 has a bottom portion 60b that closes the drive body accommodating space 61 on one side ( ⁇ Y side) in the axial direction of the motor 1. Therefore, a member (output shaft 55 or the like) to be accommodated in the drive body accommodating space 61 from the other side (+ Y side) in the axial direction can be supported by the bottom portion 60b, which improves the assembling accuracy and simplifies the assembling process. be able to. Further, since the bottom portion 60b is a part of the housing main body 60, one side of the drive body accommodating space 61 in the axial direction is closed in advance. Therefore, the number of parts can be reduced and the assembly process can be simplified as compared with the case where the drive body accommodating space 61 is opened on both sides in the axial direction.
  • the box-shaped portion 60d has a box shape surrounding the inverter 8.
  • the box-shaped portion 60d opens upward to form a second opening 62a.
  • the box-shaped portion 60d and the inverter cover 68 form a wall surface of the inverter accommodating space 62.
  • the box-shaped portion 60d is connected to the upper side of the tubular portion 60a.
  • a part of the box-shaped portion 60d is composed of a part of the tubular portion 60a and the expansion portion 60c.
  • the box-shaped portion 60d includes a box bottom portion (partition wall, second wall portion) 60da located between the motor 1 and the inverter 8 in the radial direction of the motor axis J1, and the inverter 8 and the gear portion on the other side in the axial direction of the inverter 8. It has a side wall portion 60db (partition wall, first wall portion) located between the side wall portion and the other side wall portion.
  • the box bottom portion 60da is a part of the tubular portion 60a and faces the second opening in the vertical direction.
  • the side wall portion 60db is a part of the expansion portion 60c and extends upward from the box bottom portion 60da.
  • the box bottom portion 60da and the side wall portion 60db function as partition walls 66 that partition the drive body accommodation space 61 and the inverter accommodation space 62. Further, the side wall portion 60db is provided with a through hole 60h. The through hole 60h communicates the drive body accommodating space 61 and the inverter accommodating space 62. As will be described later, the bus bar 9 passes through the through hole 60h.
  • the housing main body 60 has a partition wall 66 that partitions the drive body accommodation space 61 and the inverter accommodation space 62. That is, according to the present embodiment, the member accommodating the motor 1 and the gear portion 5 and the member accommodating the inverter 8 are composed of a single member (housing body 60). Therefore, the rigidity of the housing body 60 as a whole is increased, and the effect of suppressing vibration is enhanced. As a result, the transmission of vibration caused by the driving of the motor 1 and the gear portion 5 to the inverter 8 is suppressed, and the load on the inverter 8 can be suppressed.
  • the inverter cover 68 is fixed to the box-shaped portion 60d.
  • the inverter cover 68 has a top plate portion 68a extending along a horizontal plane.
  • the inverter 8 is fixed to the back surface of the top plate portion 68a (that is, the surface facing the inside of the inverter accommodating space 62). As a result, the inverter cover 68 supports the inverter 8.
  • the inverter 8 is fixed to the inverter cover 68 that can be detached from the housing body 60. Therefore, the inverter 8 can be easily detached from the motor unit 10 by releasing the fastening between the inverter cover 68 and the housing body 60 when performing maintenance of the motor unit 10 such as periodic inspection and parts replacement. This step can be performed even when the motor unit 10 is mounted on the vehicle, and the maintainability of the inverter 8 can be improved.
  • the top plate portion 68a may be provided with a flow path for a refrigerant for cooling the inverter 8.
  • the flow path of the refrigerant is provided on the inverter cover 68, which is a member separate from the housing body 60 in contact with the motor 1.
  • the temperature of the inverter 8 can be suppressed to be lower than the temperature of the motor.
  • the flow path provided in the top plate portion 68a may be connected to the passage portion (recessed portion 44) described later. In this case, as the refrigerant, the refrigerant that cools the inverter 8 and the refrigerant that cools the motor 1 can be shared.
  • 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 at the time of regeneration.
  • the motor 1 of this embodiment is a three-phase AC motor.
  • Motor 1 is connected to inverter 8.
  • the inverter 8 converts the direct current supplied from the battery (not shown) into an alternating current and supplies the direct current to the motor 1.
  • Each rotation speed of the motor 1 is controlled by controlling the inverter 8.
  • the motor 1 has a rotor 31 and a stator 35 located on the radial outer side of the rotor 31.
  • the rotor 31 can rotate about the motor axis J1.
  • the stator 35 is annular.
  • the stator 35 surrounds the rotor 31 from the radial outside of the motor axis J1.
  • the rotor 31 has a motor shaft 32, a rotor core 31a, and a rotor magnet (not shown) held by the rotor core 31a. That is, the motor 1 has a motor shaft 32.
  • the rotor 31 (that is, the motor shaft 32, the rotor core 31a, and the rotor magnet) rotates about the motor axis J1.
  • the torque of the rotor 31 is transmitted to the gear portion 5.
  • the rotor core 31a is formed by laminating silicon steel plates.
  • the rotor core 31a is a cylindrical body extending along the axial direction.
  • a plurality of rotor magnets are fixed to the rotor core 31a.
  • the plurality of rotor magnets are arranged along the circumferential direction with alternating magnetic poles.
  • the motor shaft 32 extends along the motor axis J1 extending in the width direction of the vehicle.
  • the motor shaft 32 is a hollow shaft that opens on both sides of the motor axis J1 in the axial direction. That is, the motor shaft 32 has hollow portions 32h that open on both sides in the axial direction.
  • the motor shaft 32 has a first end portion 32A located on the other side (+ Y side) in the axial direction and a second end portion 32B located on the one side ( ⁇ Y side) in the axial direction.
  • the first end 32A of the motor shaft 32 is rotatably supported by the ball bearing 73.
  • a female spline 32b is provided in the opening of the hollow portion 32h of the first end portion 32A.
  • the motor shaft 32 is connected to the input shaft 11 of the gear portion 5 at the female spline 32b of the second end portion 32B.
  • the second end 32B of the motor shaft 32 is rotatably supported by the ball bearing 72.
  • a resolver rotor 3a is fixed to the outer peripheral surface of the second end portion 32B.
  • the resolver rotor 3a rotates around the motor axis J1 together with the motor shaft 32.
  • the resolver rotor 3a is located on one side ( ⁇ Y side) in the axial direction with respect to the ball bearing 72 that supports the second end portion 32B.
  • the stator 35 has an annular stator core 35a, a coil 35b wound around the stator core 35a, and an insulator (not shown) interposed between the stator core 35a and the coil 35b.
  • the stator core 35a has a plurality of teeth protruding inward in the radial direction of the motor axis J1.
  • a coil wire is wound around the tooth.
  • the coil wire wound around the tooth constitutes the coil 35b.
  • the coil 35b has a coil end portion 35c protruding from the stator core 35a on both sides in the axial direction.
  • One coil end portion 35c protrudes axially from the end face on the other side in the axial direction of the stator core 35a, and the other coil end portion 35c protrudes axially from the end face on one side in the axial direction of the stator core 35a.
  • a connecting coil wire 35d extends from the coil end portion 35c on the other side in the axial direction.
  • the connecting coil wire 35d has a twisted coil wire and an insulating tube that covers the outer circumference of the coil wire. Since the motor 1 of the present embodiment is a three-phase AC motor, it has three connecting coil wires 35d corresponding to each phase.
  • the connection coil wire 35d is connected to the inverter 8 via the bus bar 9.
  • the gear portion 5 is connected to the other side (+ Y side) of the motor 1 in the axial direction.
  • the gear portion 5 transmits the power of the motor 1 and outputs the power from the output shaft 55.
  • the gear unit 5 incorporates a plurality of mechanisms responsible for power transmission between the drive source and the driven device.
  • the gear portion 5 includes an input shaft 11, an input gear 21, a counter shaft 13, a counter gear 23, a drive gear 24, a ring gear 51, an output shaft 55, and a differential device 50.
  • Each gear and each shaft of the gear portion 5 can rotate around either the motor axis J1 or the counter axis J3, respectively.
  • the motor axis J1 and the counter axis J3 extend parallel to each other.
  • the motor axis J1 and the counter axis J3 are parallel to the width direction of the vehicle.
  • the axial direction means the axial direction of the motor axis J1. That is, the axial direction in the present specification means a direction parallel to the motor axis J1 and a vehicle width direction.
  • the input shaft 11 extends along the motor axis J1.
  • the input shaft 11 is a hollow shaft that opens on both sides of the motor axis J1 in the axial direction. That is, the input shaft 11 has hollow portions 11h that open on both sides in the axial direction.
  • the input shaft 11 has a first end portion 11A located on the other side (+ Y side) in the axial direction and a second end portion 11B located on one side ( ⁇ Y side) in the axial direction.
  • the input shaft 11 is rotatably supported by a ball bearing 74 between the first end 11A and the second end 11B.
  • a male spline 11a is provided on the outer peripheral surface of the second end 11B of the input shaft 11.
  • the male spline 11a fits into the female spline 32b of the motor shaft 32.
  • the first end 32A of the motor shaft 32 and the second end 32B of the input shaft 11 are connected to each other. That is, the input shaft 11 is connected to the motor shaft 32 in the axial direction.
  • the hollow portion 32h of the motor shaft 32 and the hollow portion 11h of the input shaft 11 communicate with each other. The rotation of the motor 1 is transmitted to the input shaft 11 to rotate the input shaft 11.
  • the input gear 21 is provided on the outer peripheral surface of the first end portion 11A of the input shaft 11.
  • the input gear 21 rotates around the motor axis J1 together with the input shaft 11.
  • the input gear 21 and the input shaft 11 are a single member.
  • the input gear 21 may be a separate member assembled on the outer peripheral surface of the input shaft 11.
  • the counter shaft 13 extends along the counter axis J3.
  • the counter shaft 13 rotates around the counter axis J3.
  • the counter shaft 13 has a first end portion 13A located on the other side (+ Y side) in the axial direction and a second end portion 13B located on the one side ( ⁇ Y side) in the axial direction.
  • the first end 13A of the counter shaft 13 is rotatably supported by a ball bearing 79.
  • the second end 13B of the counter shaft 13 is rotatably supported by a ball bearing 78.
  • a counter gear 23 and a drive gear 24 are provided on the outer peripheral surface of the counter shaft 13 between the first end portion 13A and the second end portion 13B in the axial direction.
  • the drive gear 24 is located on the other side (+ Y side) of the counter gear in the axial direction.
  • the counter gear 23 rotates around the counter axis J3 together with the counter shaft 13.
  • the counter gear 23 meshes with the input gear 21.
  • the drive gear 24 rotates around the counter axis J3 together with the counter shaft 13 and the counter gear 23.
  • the ring gear 51 is a gear centered on the motor axis J1.
  • the ring gear 51 is fixed to the differential device 50.
  • the ring gear 51 rotates around the motor axis J1.
  • 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 arranged around the motor axis J1. That is, the differential device 50 is arranged coaxially with the motor 1.
  • the differential device 50 is a device for transmitting the torque output from the motor 1 to the wheels H of the vehicle.
  • the differential device 50 has a function of transmitting the same torque to the output shafts 55 of the left and right wheels while absorbing the speed difference between the left and right wheels H when the vehicle turns.
  • the differential device 50 has a gear housing 52 fixed to the ring gear 51, a pair of pinion gears 53a, a pinion shaft 53b, and a pair of side gears 54.
  • the gear housing 52 rotates about the motor axis J1 together with the ring gear 51.
  • the gear housing 52 accommodates a pair of pinion gears 53a, a pinion shaft 53b, and a pair of side gears 54.
  • the pair of pinion gears 53a are bevel gears that are coaxially arranged and face each other.
  • the pair of pinion gears 53a are supported by the pinion shaft 53b.
  • the pair of side gears 54 are bevel gears that mesh with the pair of pinion gears 53a at right angles.
  • the pair of side gears 54 are fixed to the output shaft 55, respectively.
  • the gear housing 52 is rotatably supported by conical roller bearings 76 and 77 from both sides in the axial direction. That is, the ring gear 51 is supported by the conical roller bearings 76 and 77 via the gear housing 52.
  • the output shaft 55 extends along the motor axis J1.
  • the output shaft 55 rotates around the motor axis J1.
  • the motor unit 10 is provided with a pair of output shafts 55 arranged along the axial direction.
  • the pair of output shafts 55 are connected to the side gear 54 of the differential device 50 at one end of each. 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.
  • each of the pair of output shafts 55 projects to the outside of the housing 6 at the other end.
  • Wheels H are attached to the other end of the output shaft 55.
  • the output shaft 55 outputs power to the outside (road surface via the wheel H).
  • the output shaft 55 is arranged coaxially with the motor shaft 32 and the input shaft 11.
  • One of the pair of output shafts 55 arranged on one side ( ⁇ Y side) in the axial direction is passed through the hollow portions 32h and 11h of the motor shaft 32 and the input shaft 11.
  • a part of the output shaft 55 is arranged inside the motor shaft 32 and the input shaft 11, so that the motor 1 and the differential device 50 are coaxially aligned when viewed from the axial direction.
  • the size of the motor unit 10 in the radial direction of the motor axis J1 can be reduced.
  • the gear portion 5 constitutes a power transmission path from the motor 1 to the output shaft 55.
  • the gear portion 5 has a plurality of gears (input gear 21, counter gear 23, drive gear 24 and ring gear 51, pinion gear 53a and side gear 54).
  • the gear unit 5 transmits power from the motor shaft 32 to the output shaft 55 by these plurality of gears.
  • the power of the motor 1 is first transmitted from the motor shaft 32 to the input shaft 11, and further transmitted from the input gear 21 to the counter gear 23.
  • the counter gear 23 is arranged coaxially with the drive gear 24 and rotates together with the drive gear 24.
  • the power of the motor 1 is transmitted from the drive gear 24 to the ring gear 51, and is transmitted to the output shaft 55 via the differential device 50.
  • the stator holder 40 has a cylindrical portion 41 that surrounds the stator 35 from the outside in the radial direction, and a bottom plate portion 42 that extends inward in the radial direction from an end portion of the cylindrical portion 41 on one axial side ( ⁇ Y side).
  • the stator holder 40 is arranged inside the tubular portion 60a of the housing body 60.
  • the tubular portion 60a of the housing body 60 has an opposing inner peripheral surface 60a that faces inward in the radial direction.
  • the facing inner peripheral surface 60aa faces the outer peripheral surface 41a of the cylindrical portion 41 in the radial direction.
  • the cylindrical portion 41 has a cylindrical shape centered on the motor axis J1.
  • the stator 35 is supported by fitting the outer peripheral surface of the stator 35 to the inner peripheral surface 41b of the cylindrical portion 41. As a result, the stator holder 40 supports the stator 35.
  • a fitting portion 41p is provided on the inner peripheral surface 41b of the cylindrical portion 41.
  • the fitting portion 41p is provided in the opening on the other side (+ Y side) of the cylindrical portion 41 in the axial direction.
  • the inner diameter of the fitting portion 41p is larger than the region where the stator 35 is fitted on the inner peripheral surface 41b.
  • the first retainer 81 of the shaft holding portion 80 is fitted into the fitting portion 41p.
  • the outer peripheral surface 41a of the cylindrical portion 41 is provided with a recess (passage portion) 44 recessed in the radial direction.
  • the recess 44 extends over the entire circumference around the motor axis J1.
  • the recess 44 opens outward in the radial direction.
  • the opening of the recess 44 is covered by the facing inner peripheral surface 60aa of the housing body 60.
  • the recess 44 functions as a passage portion through which the refrigerant W flows.
  • the refrigerant W flows along the circumferential direction between the inner wall surface of the recess 44 and the facing inner peripheral surface 60aa.
  • the refrigerant W cools the stator 35 via the stator holder 40.
  • the refrigerant W passes through a heat exchanger (not shown) and is cooled. Therefore, the stator holder 40 and the cylindrical portion 41 of the housing body 60 function as a water jacket that surrounds the stator 35 and allows the refrigerant W to pass therethrough to cool the stator 35.
  • the case where the recess 44 is provided on the outer peripheral surface 41a of the cylindrical portion 41 and the opening of the recess 44 is covered by the facing inner peripheral surface 60aa has been described.
  • a configuration may be adopted in which a recess is provided on the facing inner peripheral surface 60aa and the opening of the recess is covered by the outer peripheral surface 41a of the cylindrical portion 41.
  • the configuration for passing the refrigerant W is not limited to this embodiment, and a passage portion for passing the refrigerant W may be provided between the outer peripheral surface 41a of the cylindrical portion 41 and the facing inner peripheral surface 60aa.
  • a pair of fitting portions 46 that fit into the opposing inner peripheral surfaces 60aa are provided on the outer peripheral surface 41a of the cylindrical portion 41.
  • the fitting portion 46 extends over the entire circumference around the motor axis J1.
  • One of the pair of fitting portions 46 is located on the other side of the recess 44 in the axial direction, and the other is located on one side of the recess 44 in the axial direction.
  • the stator holder 40 fits into the facing inner peripheral surface 60aa of the housing body 60 at the fitting portion 46. As a result, the positional accuracy of the stator holder 40 in the radial direction with respect to the housing body 60 can be improved.
  • a pair of concave grooves 45a are provided on the outer peripheral surface 41a of the cylindrical portion 41.
  • the concave groove 45a extends over the entire circumference around the motor axis J1.
  • One of the pair of recessed grooves 45a is located on the other side of the recess 44 in the axial direction, and the other is located on one side of the recess 44 in the axial direction.
  • Both of the pair of recessed grooves 45a are arranged between the pair of fitting portions 46 in the axial direction.
  • the concave groove 45a opens outward in the radial direction.
  • the opening of the groove 45a is covered by the facing inner peripheral surface 60aa of the housing body 60.
  • An O-ring (sealing portion) 45b is housed in each of the pair of recessed grooves 45a.
  • the O-ring 45b is compressed in the radial direction by the facing inner peripheral surface 60aa. As a result, the O-ring 45b functions as a sealing portion.
  • a configuration may be adopted in which a concave groove for accommodating the O-ring is provided on the facing inner peripheral surface 60aa, and the O-ring is compressed by the outer peripheral surface 41a of the cylindrical portion 41. That is, the O-ring 45b as the sealing portion may be arranged between the outer peripheral surface 41a of the cylindrical portion 41 and the facing inner peripheral surface 60aa and may extend along the circumferential direction.
  • the O-ring 45b is located on both sides of the recess 44 as the passage portion of the refrigerant W in the axial direction.
  • the O-ring 45b suppresses the refrigerant W from leaking from the recess 44 to both sides in the axial direction. Further, it is possible to prevent the oil O in the drive body accommodating space 61 from entering between the pair of O-rings 45b. As a result, the oil O is prevented from mixing with the refrigerant W in the recess 44.
  • the bottom plate portion 42 is located on one side (-Y side) in the axial direction with respect to the motor 1.
  • the bottom plate portion 42 has a plate shape orthogonal to the motor axis J1.
  • An insertion hole 42a is provided in the center of the bottom plate portion 42.
  • the insertion hole 42a penetrates the bottom plate portion 42 in the plate thickness direction.
  • the bottom plate portion 42 has a bearing holding portion 43 that projects from the edge portion of the insertion hole 42a to the other side (+ Y side) in the axial direction.
  • the bottom plate portion 42 holds the ball bearing 72. Therefore, the bottom plate portion 42 rotatably supports the motor shaft 32 via the ball bearing 72.
  • the stator holder 40 that supports the stator 35 supports the rotor 31 via the ball bearing 72. That is, the only members interposed between the stator 35 and the rotor 31 are the stator holder 40 and the ball bearing 72. Therefore, according to the present embodiment, by controlling the dimensions of the stator holder 40, the coaxiality of the rotor 31 with respect to the stator 35 can be increased, and the driving efficiency of the motor 1 can be easily increased.
  • the bottom plate portion 42 of the stator holder 40 holds the ball bearing 72. Therefore, as compared with the case where a member for holding the ball bearing 72 is separately provided, the entire motor unit 10 can be easily miniaturized in the axial direction.
  • the axial position of the bearing holding portion 43 of the stator holder 40 overlaps with the axial position of the stator 35. As a result, the motor unit 10 can be miniaturized more effectively in the axial direction.
  • the output shaft 55 protrudes from the opening on one side (-Y side) of the motor shaft 32 in the axial direction.
  • the output shaft 55 and the motor shaft 32 are supported by ball bearings 71 and 72 arranged side by side in the axial direction, respectively.
  • the ball bearings 71 and 72 one is held by the housing body 60 and the other is held by the stator holder 40.
  • the structure of the housing body 60 can be simplified and the assembly process as a whole can be simplified as compared with the case where the housing body 60 holds both the two ball bearings 71 and 72. ..
  • the ball bearing 72 is arranged inside the pair of coil end portions 35c of the stator 35 in the radial direction of one of the coil end portions 35c located on one side in the axial direction. More specifically, the axial position of the ball bearing 72 overlaps with the axial position of one coil end portion 35c located on one side in the axial direction. Therefore, the ball bearing 72 that supports the second end 32B of the motor shaft 32 can be arranged closer to the first end 32A side. As a result, the ball bearings 72 and 73 that support both ends of the motor shaft 32 can be arranged close to each other, and the eccentricity of the motor shaft 32 can be suppressed. Further, the coil end portion 35c can be cooled and the oil O dropped from the coil end portion 35c can be supplied to the ball bearing 72, and the lubricity of the ball bearing 72 can be improved.
  • the bottom plate portion 42 of the stator holder 40 supports the resolver stator 3b in addition to the ball bearing 72.
  • the resolver stator 3b is inside the insertion hole 42a and is arranged on one side in the axial direction from the ball bearing 72.
  • the resolver stator 3b surrounds the second end 32B of the motor shaft 32 from the outside in the radial direction.
  • the resolver stator 3b faces the resolver rotor 3a in the radial direction.
  • the resolver stator 3b and the resolver rotor 3a constitute the resolver 3. That is, the motor unit 10 includes a resolver 3.
  • the resolver 3 measures the rotation speed of the motor shaft 32.
  • the resolver 3 is arranged between the ball bearing 71 and the ball bearing 72 in the axial direction.
  • the resolver stator 3b since the bottom plate portion 42 of the stator holder 40 supports the resolver stator 3b, the resolver stator 3b has an axial dimension of the motor 1 as compared with the case where the housing body 60 supports the resolver stator 3b. It can be placed closer to the center. As a result, it is possible to prevent the resolver stator 3b from protruding in the axial direction with respect to the motor 1, and the axial dimension of the motor unit 10 can be reduced.
  • the shaft holding portion 80 is arranged in the drive body accommodating space 61. Further, the shaft holding portion 80 is located between the motor 1 and the gear portion 5.
  • the shaft holding portion 80 includes a first retainer 81, a second retainer 86, ball bearings 73, 74, 75, 78, and a conical roller bearing 76.
  • the first retainer 81 is fixed to the stator holder 40 from the other side (+ Y side) in the axial direction. Further, the second retainer 86 is fixed to the first retainer 81 from the other side (+ Y side) in the axial direction.
  • the ball bearings 73, 74, 78 are held by the first retainer 81. Further, the ball bearing 75 and the conical roller bearing 76 are held by the second retainer 86.
  • FIG. 3 is an exploded perspective view of the shaft holding portion 80.
  • the first retainer 81 has a main body disk portion 82 and a protruding disk portion 83.
  • the main body disk portion 82 and the protruding disk portion 83 are single members connected to each other.
  • the outer diameter of the main body disk portion 82 is larger than the outer diameter of the protruding disk portion 83.
  • the protruding disk portion 83 is arranged so as to be offset from the main body disk portion 82 to the other side (+ Y side) in the radial direction and the axial direction.
  • the main body disk portion 82 has a disk shape centered on the motor axis J1.
  • a first insertion hole 82h penetrating in the axial direction is provided in the center of the main body disk portion 82.
  • the first insertion hole 82h is circular with the motor axis J1 as the center when viewed from the axial direction.
  • the first end portion 32A of the motor shaft 32, the second end portion 11B of the input shaft 11, and the output shaft 55 are arranged inside the first insertion hole 82h.
  • a plurality of screw holes 82s are provided on the other side (+ Y side) of the main body disk portion 82 in the axial direction.
  • the plurality of screw holes 82s are arranged along the circumferential direction of the motor axis J1 so as to surround the first insertion hole 82h.
  • a fixing screw 84 for fixing the second retainer 86 is inserted into the screw hole 82s. That is, the second retainer 86 is fixed to the first retainer 81 by a plurality of fixing screws 84 inserted on one side ( ⁇ Y side) in the axial direction.
  • the second retainer 86 can be assembled to the first retainer 81 from the first opening 61a side in the drive body accommodation space 61, so that the assembly process of the motor unit 10 can be simplified. Further, the plurality of fixing screws 84 are arranged along the circumferential direction of the motor axis J1. Therefore, the second retainer 86 can be firmly fixed around the motor axis J1.
  • the protruding disk portion 83 has a disk shape centered on the counter axis J3.
  • a second insertion hole 83h penetrating in the axial direction is provided in the center of the protruding disk portion 83.
  • the second end portion 13B of the counter shaft 13 is arranged inside the second insertion hole 83h.
  • the main body disk portion 82 has an outer edge protruding portion 82c that protrudes from the outer edge to one side ( ⁇ Y side) in the axial direction.
  • the outer edge protruding portion 82c has a cylindrical shape centered on the motor axis J1.
  • the outer peripheral surface of the outer edge protruding portion 82c is fitted into the fitting portion 41p of the stator holder 40.
  • the first retainer 81 is supported by the stator holder 40. Further, the first retainer 81 is fixed to the housing body 60 via the stator holder 40.
  • the main body disk portion 82 has two bearing holding portions 82a and 82b.
  • the bearing holding portions 82a and 82b are provided on the outer edge of the first insertion hole 82h.
  • the bearing holding portion 82a is provided on the surface of the main body disk portion 82 facing one side (-Y side) in the axial direction.
  • the bearing holding portion 82a holds the ball bearing 73.
  • the bearing holding portion 82a rotatably supports the first end portion 32A of the motor shaft 32 via the ball bearing 73.
  • the ball bearing 73 is located between the motor 1 and the gear portion 5 in the axial direction. Therefore, the shaft holding portion 80 rotatably supports the motor shaft 32 on the other side in the axial direction of the motor 1.
  • the motor 1 and the gear portion 5 are housed in a connected drive body accommodating space 61. Therefore, if the shaft holding portion 80 is not provided, the motor shaft 32 becomes cantilevered and there is a possibility that eccentricity due to rotation becomes remarkable.
  • the shaft holding portion 80 rotatably supports the motor shaft 32 between the motor 1 and the gear portion 5. Therefore, the shaft holding portion 80 can support the motor shaft 32 on both sides of the motor 1 together with the ball bearing 72 that supports the second end portion 32B. According to this embodiment, the eccentricity of the motor shaft 32 can be suppressed and the rotational efficiency of the motor shaft 32 can be improved.
  • the bearing holding portion 82b is provided on the surface of the main body disk portion 82 facing the other side (+ Y side) in the axial direction.
  • the bearing holding portion 82b holds the ball bearing 74.
  • the bearing holding portion 82b rotatably supports the input shaft 11 via the ball bearing 74.
  • the protruding disk portion 83 has a bearing holding portion 83a.
  • the bearing holding portion 83a is provided on the outer edge of the second insertion hole 83h.
  • the bearing holding portion 83a is provided on a surface of the protruding disk portion 83 facing the other side (+ Y side) in the axial direction.
  • the bearing holding portion 83a supports the ball bearing 78.
  • the bearing holding portion 83a rotatably supports the counter shaft 13 via the ball bearing 78.
  • the first retainer 81 rotatably supports not only the shaft (motor shaft 32 and input shaft 11) on the motor axis J1 but also the shaft (counter shaft 13) on the counter axis J3. .. Therefore, by controlling the machining accuracy of the first retainer 81, the distance dimension between the motor axis J1 and the counter axis J3 can be guaranteed, and as a result, the power transmission efficiency between the gears can be improved. Further, by assembling the first retainer 81 to the housing body 60 with a plurality of bearings (ball bearings 73, 78) incorporated, the assembly process can be simplified.
  • the axial positions of the ball bearing 73 and the ball bearing 78 may overlap each other. Further, the ball bearing 74 and the ball bearing 78 may overlap each other in the axial direction. That is, it is preferable that the positions of the plurality of bearings of the shaft holding portion 80 overlap each other in the axial direction. As a result, the axial dimension of the shaft holding portion 80 can be reduced as compared with the case where the bearings are arranged so as to be displaced, and the drive body accommodating space 61 can be effectively used. Further, in a plurality of bearings having overlapping axial positions, oil O scattered in the radial direction from one bearing can be supplied to another bearing, and the lubricity of the bearing can be improved.
  • the second retainer 86 has a surrounding portion 88 and a flange portion 89.
  • the enclosing portion 88 and the flange portion 89 are a single member connected to each other.
  • the surrounding portion 88 is an annular shape that surrounds the motor axis J1 from the outside in the radial direction.
  • the surrounding portion 88 has a disc portion 88a and a surrounding cylinder portion 88b extending axially from the outer edge of the disc portion 88a to one side in the axial direction.
  • the disk portion 88a has a disk shape centered on the motor axis J1.
  • a third insertion hole 88h penetrating in the axial direction is provided in the center of the disk portion 88a.
  • the third insertion hole 88h is circular with the motor axis J1 as the center when viewed from the axial direction.
  • An output shaft 55 is arranged inside the third insertion hole 88h.
  • the disk portion 88a has two bearing holding portions 88e and 88f.
  • the bearing holding portions 88e and 88f are provided on the outer edge of the third insertion hole 88h.
  • the surrounding cylinder portion 88b has a tubular shape centered on the motor axis J1.
  • the surrounding cylinder portion 88b opens on one side (-Y side) in the axial direction.
  • the surrounding cylinder portion 88b is provided with a notch portion 88c.
  • the cutout portion 88c extends from the end portion of the surrounding cylinder portion 88b on one side ( ⁇ Y side) in the axial direction to the other side (+ Y side) in the axial direction.
  • the cutout portion 88c is provided in the upper region of the entire circumference of the surrounding cylinder portion 88b.
  • the notch 88c functions as an opening 87 that exposes the inside of the surrounding portion 88 upward.
  • the flange portion 89 is located at the end of the surrounding portion 88 on one side (-Y side) in the axial direction. More specifically, the flange portion 89 extends radially outward from one end in the axial direction of the surrounding cylinder portion 88b.
  • the flange portion 89 is provided with a plurality of through holes 89a penetrating in the axial direction.
  • the plurality of through holes 89a are arranged along the circumferential direction of the motor axis J1.
  • a fixing screw 84 inserted into the screw hole 82s of the first retainer 81 is passed through the through hole 89a in order to fix the second retainer 86 to the first retainer 81. As a result, the second retainer 86 is supported by the first retainer 81.
  • the bearing holding portion 88f of the second retainer 86 is provided on a surface of the disk portion 88a facing one side (-Y side) in the axial direction.
  • the bearing holding portion 88f holds the ball bearing 75.
  • the bearing holding portion 88f rotatably supports the output shaft 55 via the ball bearing 75.
  • the bearing holding portion 88e is provided on the surface of the main body disk portion 82 facing the other side (+ Y side) in the axial direction.
  • the bearing holding portion 88e holds the conical roller bearing 76.
  • the bearing holding portion 88e rotatably supports the gear housing 52 and the ring gear 51 via the conical roller bearing 76.
  • the second retainer 86 that supports the output shaft 55 via the ball bearing 75 is fixed to the first retainer 81.
  • the first retainer 81 supports the motor shaft 32 and the input shaft 11 via ball bearings 73 and 74. Therefore, according to the present embodiment, the coaxiality of the output shaft 55 with respect to the motor shaft 32 and the input shaft 11 can be guaranteed by the assembly accuracy of the second retainer 86 with respect to the first retainer 81. Therefore, it is easy to increase the rotational efficiency of the motor shaft 32 and the input shaft 11.
  • the shaft holding portion 80 has a surrounding portion 88 that surrounds the motor axis, and the surrounding portion 88 is provided with an opening 87 that opens in the radial direction of the motor axis J1.
  • the opening 87 communicates the inside and outside of the surrounding portion 88.
  • the opening 87 of the present embodiment exposes the ball bearings 74 and 75 into the drive body accommodating space 61. Therefore, according to the present embodiment, the oil O can be supplied to the ball bearings 74 and 75 from the opening 87, and the lubricity of the ball bearings 74 and 75 can be improved.
  • the opening 87 opens upward. Therefore, the oil O that has reached the inside of the surrounding portion 88 from the opening 87 collects inside the surrounding portion 88. That is, the surrounding portion 88 has an oil storage space 64 in which the oil O is stored. Further, the opening 87 and the oil storage space 64 are arranged in the second retainer 86.
  • the surrounding portion 88 of the shaft holding portion 80 of the present embodiment surrounds the first end portion 11A of the input shaft 11. Therefore, the hollow portion 11h of the input shaft 11 opens in the oil storage space 64. A part of the oil O in the oil storage space 64 penetrates into the hollow portion 11h and enhances the lubricity between the inner peripheral surface of the input shaft 11 and the output shaft 55. Further, the oil O is supplied to the male spline 11a and the female spline 32b of the connecting portion between the input shaft 11 and the motor shaft 32, and suppresses wear of the connecting portion. The oil O is scattered from the connecting portion of the male spline 11a and the female spline 32b and is supplied to the ball bearing 73 that supports the motor shaft 32 to improve the lubricity of the ball bearing 73.
  • At least a part of the input gear 21 provided at the first end 11A of the input shaft 11 is located in the oil storage space 64. Therefore, the lower end of the input gear 21 is immersed in the oil O accumulated in the oil storage space 64.
  • the oil O is scooped up by the operation of the input gear 21, diffused into the drive body accommodating space 61, and spreads over the tooth surface of each gear.
  • the meshing portion 14 in which the input gear 21 and the counter gear 23 mesh with each other is arranged in the opening 87. Therefore, the shaft holding portion 80 can transmit power from the input gear 21 to the counter gear 23 while supporting the shaft on both sides of the input gear 21 in the axial direction.
  • the shaft holding portion 80 has a plurality of bearing holding portions 82a, 82b, 88f, 88e, 83a, respectively, which hold bearings.
  • the bearing holding portions 82a, 82b, 83a are arranged in the first retainer 81
  • the bearing holding portions 88f, 88e are arranged in the second retainer 86.
  • the first retainer 81 and the second retainer 86 which are separable from each other, each have a bearing holding portion, the first retainer 81 and the second retainer 86 can be assembled in a separated state. Therefore, the assembly process can be simplified. Further, the bearings can be assembled from both sides of the first retainer 81 and the second retainer 86 in the axial direction, and it is easy to improve the positional accuracy of the bearings in the axial direction and the radial direction.
  • the inverter 8 As shown in FIG. 1, the inverter 8 is arranged in the inverter accommodation space 62. The inverter 8 is fixed to the inverter cover 68. The inverter 8 is connected to the stator 35 of the motor 1 via the bus bar 9. The inverter 8 converts a direct current into an alternating current and supplies it to the motor 1. That is, the inverter 8 controls the current supplied to the motor 1.
  • the inverter 8 is arranged on the outer peripheral surface side of the motor 1. More specifically, the inverter 8 is located directly above the motor 1. As a result, the dimensions of the motor unit 10 in the front-rear direction can be reduced. As a result, the dimensions of the motor unit 10 in the vehicle front-rear direction can be reduced as compared with the case where the inverter 8 is arranged in the vehicle front-rear direction with respect to the motor 1. As a result, it is possible to secure a wide crushable zone in the vehicle.
  • the inverter 8 Seen from the axial direction, at least a part of the inverter 8 overlaps with the counter gear 23.
  • the inverter 8 By arranging the inverter 8 so as to overlap the counter gear 23, the projected area of the motor unit 10 in the axial direction can be reduced, and the motor unit 10 can be miniaturized.
  • the bus bar 9 is made of a conductive metal material.
  • the bus bar 9 electrically connects the motor 1 and the inverter 8. Since the motor 1 of the present embodiment is a three-phase AC motor, the motor unit 10 has three inverters 8 corresponding to each phase.
  • the bus bar 9 has an axial extending portion 9a extending along the axial direction and a radial extending portion 9b extending along the radial direction of the motor axis J1.
  • the end of the axial extending portion 9a on one side ( ⁇ Y side) in the axial direction is connected to the inverter 8. Further, the end portion of the axial extending portion 9a on the other side (+ Y side) in the axial direction is connected to the radial extending portion 9b.
  • the radial extending portion 9b extends inward in diameter from the end portion of the axial extending portion and is connected to the connecting coil wire 35d at the tip thereof. That is, the bus bar 9 is connected to the inverter 8 at the axial extending portion 9a and is connected to the connecting coil wire 35d at the radial extending portion 9b.
  • the axially extending portion 9a passes through the through hole 60h provided in the partition wall 66 that partitions the drive body accommodation space 61 and the inverter accommodation space 62.
  • the bus bar 9 is arranged so as to straddle between the drive body accommodation space 61 and the inverter accommodation space 62.
  • the bus bar 9 is held by a bus bar holder (not shown).
  • the bus bar holder is arranged between the inner peripheral surface of the through hole 60h and the bus bar 9, and has a sealing structure that seals between the drive body accommodating space 61 and the inverter accommodating space 62. As a result, the bus bar holder suppresses the oil O in the drive body accommodating space 61 from entering the inverter accommodating space 62.
  • the through hole 60h through which the bus bar 9 passes is provided in the side wall portion 60db.
  • the side wall portion 60db is located on the other side in the axial direction of the inverter 8 and between the inverter 8 and the gear portion 5. Further, the through hole 60h penetrates the side wall portion 60db along the axial direction.
  • the assembly worker accommodates the bus bar 9 from the first opening 61a.
  • the bus bar 9 can be assembled to the housing body 60 by accommodating it in the space 61 and inserting it into the through hole 60h.
  • the bus bar 9 can be assembled to the housing body 60 from the first opening 61a like the other members, and the assembly process can be simplified by assembling from one direction.
  • the oil passage 90 is a route of the oil O that circulates the oil O in the housing 6.
  • the oil passage 90 is provided in the housing 6.
  • An oil pump 96 is provided in the oil passage 90.
  • the "oil passage” is not only a “flow path” that forms a stationary flow of oil in one direction, but also a path that temporarily retains oil (for example, oil storage). It is a concept that also includes a space 63) and a path through which oil drips.
  • the oil passage 90 includes a first flow path 91 that guides the oil O from the oil storage space 63 to the oil pump 96, and a second flow path 97 that extends from the oil pump 96 to the upper side of the motor 1 and supplies the oil O to the motor 1.
  • the oil O reaches the oil pump 96 from the oil storage space 63 via the first flow path 91, and is supplied to the motor 1 from the oil pump 96 via the second flow path 97. Further, the oil O drops from the motor 1 and returns to the oil storage space 63.
  • the first flow path 91 and the second flow path 97 are provided inside the wall surface of the housing body 60.
  • the first flow path 91 is connected to the oil pump 96 from the oil storage space 63.
  • the second flow path 97 extends upward from the oil pump 96 and branches, and opens on the upper side of the pair of coil end portions 35c of the stator 35.
  • the oil pump 96 is located on one side (-Y side) of the motor 1 in the axial direction.
  • the oil pump 96 is a mechanical pump connected to the output shaft 55 and driven by the rotation of the output shaft 55.
  • the oil pump 96 sucks oil O from the oil storage space 63 and pumps it into the oil passage 90.
  • FIG. 4 is a schematic view of the oil pump 96 viewed from the axial direction.
  • the oil pump 96 has a pump case 96a, an external gear 92, and an internal gear 93.
  • the pump case 96a is fixed to the bottom 60b of the housing body 60.
  • the pump case 96a is circular when viewed from the axial direction.
  • the pump case 96a is provided with a pump chamber 96c, a suction port 94, and a discharge port 95.
  • the pump chamber 96c has a circular shape centered on the axis J2 that is eccentric with respect to the motor axis J1 when viewed from the axial direction.
  • a suction port 94 and a discharge port 95 are connected to the pump chamber 96c.
  • An external gear 92 and an internal gear 93 are arranged in the pump chamber 96c.
  • the suction port 94 and the discharge port 95 are opened on the side surface of the pump chamber 96c facing one side in the axial direction.
  • the suction port 94 is connected to the first flow path 91.
  • the discharge port 95 is connected to the second flow path 97.
  • the oil pump 96 sucks oil O from the suction port 94 and discharges oil O from the discharge port 95.
  • the external tooth gear 92 is a gear that can rotate around the motor axis J1.
  • the external gear 92 is fixed to the output shaft 55.
  • the external gear 92 is housed in the pump chamber 96c.
  • the external gear 92 has a plurality of tooth portions 92a on the outer peripheral surface.
  • the tooth profile of the tooth portion 92a of the external gear 92 is a trochoid tooth profile.
  • the internal gear 93 is an annular gear that can rotate around the axis J2 that is eccentric with respect to the motor axis J1.
  • the outer diameter of the internal gear is slightly smaller than the inner diameter of the pump chamber 96c.
  • the outer peripheral surface of the internal gear 93 slidably faces the inner peripheral surface of the pump chamber 96c.
  • the internal gear 93 surrounds the radial outer side of the external gear 92 and meshes with the external gear 92.
  • the internal gear 93 has a plurality of tooth portions 93a on the inner peripheral surface.
  • the tooth profile of the tooth portion 93a of the internal gear 93 is a trochoid tooth profile.
  • the oil O discharged from the oil pump 96 is supplied to the pair of coil end portions 35c via the second flow path 97, respectively.
  • the oil O supplied to the coil end portion 35c takes heat from the stator 35 while penetrating the entire coil 35b by the capillary force and gravity acting between the coil wires. Further, the oil O drops downward, passes through the holes provided in the stator holder 40, the communication holes 65, and the like, and returns to the oil storage space 63.
  • the stator core 35a is cooled by the refrigerant W via the stator holder 40, and the coil end portion 35c is directly cooled by the oil O, so that each part of the stator 35 can be effectively cooled. ..
  • the oil O is stored in the oil storage space 63.
  • a motor 1 provided with a passage portion (recess 44) for the refrigerant W is arranged around the oil storage space 63. Therefore, the oil O in the oil storage space 63 is cooled by the refrigerant W. Therefore, the oil O is supplied to the coil end portion 35c in a state where the temperature is lowered, and the coil end portion 35c can be effectively cooled.
  • the method for manufacturing the motor unit 10 mainly includes the following first to ninth steps.
  • the first step is an output shaft assembling step of assembling the output shaft 55 to the housing body 60.
  • the bottom lid member 69 Prior to the first step, the bottom lid member 69 is assembled to the housing body 60 in advance. As a result, the bottom lid member 69 covers the third opening 63a of the housing body 60.
  • a seal member (not shown) and a ball bearing 71 are assembled to the bearing holding portion 60ba provided on the bottom portion 60b of the housing body 60.
  • the output shaft 55 is accommodated in the drive body accommodating space 61 through the first opening 61a of the housing body 60.
  • the output shaft 55 is assembled to the housing body 60 by inserting the end portion of the output shaft 55 on one side ( ⁇ Y side) in the axial direction into the ball bearing 71.
  • the oil pump 96 is assembled to the output shaft 55.
  • the second step is a motor assembling step of assembling the motor 1 to the housing body 60. Prior to the second step, the rotor 31 and the stator 35 are assembled in advance. Further, the stator 35 is previously assembled to the stator holder 40 together with the ball bearing 72.
  • the pre-assembled stator 35 and the stator holder 40 are accommodated in the drive body accommodating space 61 through the first opening 61a. Further, the fitting portion 46 of the stator holder 40 is fitted into the facing inner peripheral surface 60aa of the tubular portion 60a of the housing body 60. As a result, the stator holder 40 and the stator 35 are fixed to the housing body 60.
  • the rotor 31 is then accommodated in the drive body accommodating space 61 through the first opening 61a while inserting the output shaft 55 into the hollow portion 32h of the motor shaft 32.
  • the motor 1 and the stator holder 40 are accommodated and fixed in the drive body accommodating space 61 through the first opening 61a of the housing body 60.
  • the third step is a bus bar assembling step of assembling the bus bar 9 to the housing body 60.
  • the three bus bars 9 are accommodated in the drive body accommodating space 61 through the first opening 61a of the housing body 60, and are fixed to the housing body 60 through the through holes 60h of the housing body 60.
  • the bus bar 9 is connected to the connecting coil wire 35d extending from the stator 35.
  • the fourth step is a step of assembling the first retainer 81 to the stator holder 40. Prior to the fourth step, the ball bearing 73 and the ball bearing 78 are assembled to the first retainer 81 in advance.
  • the first retainer 81 is accommodated in the drive body accommodating space 61 through the first opening 61a of the housing body 60, and the motor shaft 32 is inserted into the ball bearing 73. Further, the outer edge protruding portion 82c of the first retainer 81 is fitted into the fitting portion 41p of the stator holder 40, and the first retainer 81 is fixed to the housing body 60 via the stator holder 40. Next, the ball bearing 74 is assembled to the first retainer 81.
  • the fifth step is a step of assembling the input shaft 11, the counter shaft 13, the input gear 21, the counter gear 23, and the drive gear 24 to the housing body 60.
  • the input shaft 11, the counter shaft 13, the input gear 21, the counter gear 23, and the drive gear 24 are housed in the drive body accommodating space 61 through the first opening 61a of the housing body 60 and assembled.
  • the sixth step is a step of assembling the second retainer 86 to the first retainer 81. Prior to the sixth step, the ball bearing 75 and the conical roller bearing 76 are assembled in advance on the second retainer 86.
  • the second retainer 86 is accommodated in the drive body accommodating space 61 through the first opening 61a of the housing body 60, and is inserted into the ball bearing 75 by the output shaft 55. Further, the second retainer 86 is fixed to the first retainer 81.
  • the shaft holding portion 80 is accommodated in the drive body accommodating space 61 from the first opening 61a of the housing body 60. Fix it.
  • the seventh step is a step of assembling the ring gear 51 and the differential device 50 to the shaft holding portion 80. Prior to the seventh step, the differential device 50 is assembled in advance, and the ring gear 51 is assembled to the gear housing 52 of the differential device 50.
  • the gear housing 52 is held by the conical roller bearing 76, and the output shaft 55 is connected to the side gear 54 of the differential device 50.
  • the fifth step and the seventh step described above are gear section assembling steps in which the gear section 5 is accommodated and fixed in the drive body accommodating space 61 from the first opening 61a.
  • the eighth step is a step of assembling the closing member 67 to the housing body 60. Prior to the eighth step, the ball bearing 79 and the conical roller bearing 77 are assembled to the closing member 67 in advance.
  • the closing member 67 is assembled and fastened so as to cover the first opening 61a of the housing body 60.
  • the counter shaft 13 is inserted into the ball bearing 79, and the conical roller bearing 77 holds the gear housing 52.
  • the first to eighth steps described above are steps of assembling each member including the motor 1 and the gear portion 5 into the drive body accommodating space 61 of the housing main body 60.
  • each member is assembled to the housing body 60 from the other side (+ Y side) in the axial direction.
  • the first to eighth steps can be performed without changing the posture of the housing body 60, and as a result, the time required for manufacturing the motor unit 10 can be shortened.
  • the ninth step is a step of assembling the inverter 8 to the housing body 60. Prior to the ninth step, the inverter 8 is assembled to the inverter cover 68 in advance. That is, the step of assembling the inverter 8 includes a preliminary step of fixing the inverter 8 to the inverter cover 68.
  • the inverter cover 68 to which the inverter 8 is assembled is fixed to the housing body 60.
  • the second opening 62a of the housing body 60 is covered with the inverter cover 68 while arranging the inverter 8 in the inverter accommodation space 62.
  • the window portion (not shown) arranged on the upper surface of the inverter cover is opened, the bus bar 9 is connected to the inverter 8 in the inverter accommodation space 62, and the window portion is closed again.
  • each member is assembled to the housing body 60 from the opening direction of the first opening 61a.
  • the inverter 8 and the inverter cover 68 are assembled to the housing body 60 from the opening direction of the second opening 62a. Therefore, the assembly posture of the housing body 60 is changed prior to performing the ninth step.
  • the steps of assembling the motor 1 and the gear portion 5 are performed with the first opening facing upward.
  • the step of assembling the inverter 8 (9th step) is performed with the second opening 62a facing upward. As a result, the assembly work can be facilitated.
  • inverter cover 71 ... ball bearing (second bearing), 72 ... ball bearing (first) Bearing), 73 ... ball bearing, 74 ... ball bearing, 75 ... ball bearing, 76 ... conical roller bearing, 77 ... conical roller bearing, 78 ... ball bearing, 79 ... ball bearing, 80 ... shaft holder, 81 ... first Retainer, 82a ... Bearing holding part, 82b ... Bearing holding part, 83a ... Bearing holding part, 84 ... Fixing screw, 86 ... Second retainer, 87 ... Opening, 88 ... Surrounding part, 88e ... Bearing holding part, 88f ... Bearing Holding part, J1 ... motor axis, J2 ... axis, J3 ... counter axis, O ... oil, W ... refrigerant

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

La présente invention concerne une unité de moteur qui selon un aspect comprend : un moteur qui comprend un rotor ayant un arbre de moteur qui tourne autour d'une ligne axiale de moteur, et qui comprend un stator positionné à l'extérieur dans la direction radiale du rotor ; un premier palier pour supporter l'arbre de moteur ; un support de stator pour maintenir le stator ; et un corps de boîtier pour recevoir le moteur et le support de stator. Le support de stator comprend : une partie cylindrique entourant le stator de l'extérieur dans la direction radiale ; et une partie plaque inférieure s'étendant à l'intérieur dans la direction radiale à partir d'une extrémité de la partie cylindrique sur un côté dans la direction axiale. Le corps de boîtier comprend une surface périphérique interne opposée qui s'oppose à la surface périphérique externe de la partie cylindrique dans la direction radiale. Un passage pour faire passer un fluide frigorigène est disposé entre la surface périphérique externe de la partie cylindrique et la surface périphérique interne opposée. La partie plaque inférieure maintient le premier palier.
PCT/JP2020/034765 2020-02-19 2020-09-14 Unité de moteur WO2021166298A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080096975.2A CN115136470A (zh) 2020-02-19 2020-09-14 马达单元
DE112020006735.1T DE112020006735T5 (de) 2020-02-19 2020-09-14 Motoreinheit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-026149 2020-02-19
JP2020026149 2020-02-19

Publications (1)

Publication Number Publication Date
WO2021166298A1 true WO2021166298A1 (fr) 2021-08-26

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PCT/JP2020/034765 WO2021166298A1 (fr) 2020-02-19 2020-09-14 Unité de moteur

Country Status (3)

Country Link
CN (1) CN115136470A (fr)
DE (1) DE112020006735T5 (fr)
WO (1) WO2021166298A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023127410A1 (fr) * 2021-12-28 2023-07-06 ニデック株式会社 Dispositif d'entraînement
WO2024042797A1 (fr) * 2022-08-25 2024-02-29 ニデック株式会社 Dispositif d'entraînement
WO2024070228A1 (fr) * 2022-09-30 2024-04-04 ニデック株式会社 Dispositif d'entraînement

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JPH10288219A (ja) * 1997-04-14 1998-10-27 Daikin Ind Ltd 回転機械における軸受ハウジングの軸受孔形成方法
JP2010242822A (ja) * 2009-04-03 2010-10-28 Ihi Corp タービン発電機の軸受構造
JP2010283929A (ja) * 2009-06-02 2010-12-16 Honda Motor Co Ltd 電動機
JP2011004487A (ja) * 2009-06-17 2011-01-06 Honda Motor Co Ltd 電動機
JP2012147550A (ja) * 2011-01-11 2012-08-02 Nippon Densan Corp モータ
JP2017104011A (ja) * 2017-02-10 2017-06-08 日本電産株式会社 モータ

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Publication number Priority date Publication date Assignee Title
JP4485566B2 (ja) 2007-11-13 2010-06-23 本田技研工業株式会社 モータ式動力装置
JP2020026149A (ja) 2018-08-09 2020-02-20 イイダ産業株式会社 パネル体及び中空構造体

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
JPH10288219A (ja) * 1997-04-14 1998-10-27 Daikin Ind Ltd 回転機械における軸受ハウジングの軸受孔形成方法
JP2010242822A (ja) * 2009-04-03 2010-10-28 Ihi Corp タービン発電機の軸受構造
JP2010283929A (ja) * 2009-06-02 2010-12-16 Honda Motor Co Ltd 電動機
JP2011004487A (ja) * 2009-06-17 2011-01-06 Honda Motor Co Ltd 電動機
JP2012147550A (ja) * 2011-01-11 2012-08-02 Nippon Densan Corp モータ
JP2017104011A (ja) * 2017-02-10 2017-06-08 日本電産株式会社 モータ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023127410A1 (fr) * 2021-12-28 2023-07-06 ニデック株式会社 Dispositif d'entraînement
WO2024042797A1 (fr) * 2022-08-25 2024-02-29 ニデック株式会社 Dispositif d'entraînement
WO2024070228A1 (fr) * 2022-09-30 2024-04-04 ニデック株式会社 Dispositif d'entraînement

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DE112020006735T5 (de) 2022-12-22
CN115136470A (zh) 2022-09-30

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