CN219659532U - Motor unit - Google Patents

Motor unit Download PDF

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Publication number
CN219659532U
CN219659532U CN202090001102.4U CN202090001102U CN219659532U CN 219659532 U CN219659532 U CN 219659532U CN 202090001102 U CN202090001102 U CN 202090001102U CN 219659532 U CN219659532 U CN 219659532U
Authority
CN
China
Prior art keywords
motor
inverter
shaft
gear
main body
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
CN202090001102.4U
Other languages
Chinese (zh)
Inventor
石川勇树
和田直大
熊谷泰伸
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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 CN219659532U publication Critical patent/CN219659532U/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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

An object of one embodiment of the present utility model is to provide a motor unit that can simplify an assembly process. One embodiment of the motor unit of the present utility model includes: a motor having a motor shaft extending along a motor axis; a gear part connected with one side of the axial direction of the motor; an inverter which is disposed on the outer peripheral surface side of the motor and controls a current to be supplied to the motor; and a housing main body provided with a driving body accommodating space accommodating the motor and the gear portion and an inverter accommodating space accommodating the inverter. The motor shaft is a hollow shaft. The gear part has: an output shaft, a part of which is disposed inside the motor shaft, the output shaft rotating around the motor axis; and a plurality of gears transmitting power from the motor shaft to the output shaft. The case main body has a partition wall that divides the drive body accommodation space and the inverter accommodation space. The housing main body has a first opening portion exposing the drive body accommodation space on one side in the axial direction.

Description

Motor unit
Technical Field
The present utility model relates to a motor unit.
The present utility model claims priority based on japanese patent application publication No. 2020-026147 filed on 2 months of 2020, the contents of which are incorporated herein by reference.
Background
In recent years, development of a driving device mounted in an electric vehicle is widely underway. Patent document 1 describes a motor-type power unit (motor unit) in which an output shaft is miniaturized by passing through the inside of a rotor shaft having a hollow structure.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2009-121549.
Disclosure of Invention
Technical problem to be solved by the utility model
The motor unit is assembled by mounting the motor and gears with respect to the housing. In the existing motor unit, the housing is open on both sides in the axial direction, for example, the motor is mounted from one opening, and the gears are mounted from the other opening. That is, in the conventional structure, since the mounting directions of the respective members to the housing are different, there is a problem that the workability such as changing the posture of the housing is required in the middle of the assembly process is poor.
An object of one embodiment of the present utility model is to provide a motor unit that can simplify an assembly process.
Technical proposal adopted for solving the technical problems
One embodiment of the motor unit of the present utility model includes: a motor having a motor shaft extending along a motor axis; a gear portion connected to one side in an axial direction of the motor; an inverter that is disposed on an outer peripheral surface side of the motor and that controls a current to be supplied to the motor; and a housing main body provided with a driving body accommodating space accommodating the motor and the gear portion and an inverter accommodating space accommodating the inverter. The inverter is disposed on an outer peripheral surface of the motor. The motor shaft is a hollow shaft. The gear portion has: an output shaft, a portion of which is disposed inside the motor shaft, the output shaft rotating about the motor axis; and a plurality of gears that transmit power from the motor shaft to the output shaft. The housing main body has a partition wall that partitions the drive body accommodation space and the inverter accommodation space. The housing main body has a first opening portion exposing the drive body accommodating space on one side in the axial direction.
Preferably, the housing main body has a bottom portion blocking the driving body accommodation space on the other side in the axial direction of the motor.
Preferably, the motor further includes a bus bar electrically connecting the motor and the inverter, and a through hole is provided in the partition wall, the through hole communicating the driving body accommodating space and the inverter accommodating space and allowing the bus bar to pass therethrough.
Preferably, the partition wall has a first wall portion located on one side in an axial direction of the inverter and located between the inverter and the gear portion, and the through hole is provided in the first wall portion.
Preferably, the inverter housing further includes an inverter cover that covers the second opening that exposes the inverter housing space, and the inverter is fixed to the inverter cover.
Preferably, the motor housing further includes a shaft holding portion that is disposed in the driving body housing space, and the shaft holding portion has a first bearing that is axially located between the motor and the gear portion and supports the motor shaft.
Preferably, the shaft holding portion has a second bearing that supports the output shaft.
Effects of the utility model
According to one aspect of the present utility model, a motor unit capable of simplifying an assembly process is provided.
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 an embodiment.
Fig. 3 is an exploded perspective view of a shaft holding portion of a motor unit according to an embodiment.
Fig. 4 is a schematic view of an oil pump of a motor unit of an embodiment.
Detailed Description
Hereinafter, a motor unit 10 according to an embodiment of the present utility model will be described with reference to the drawings. The scope of the present utility model is not limited to the following embodiments, but can be arbitrarily changed within the scope of the technical idea of the present utility model. In the following drawings, the scale, number, and the like of each structure may be different from those of the actual structure in order to facilitate understanding of each structure.
Fig. 1 is a conceptual diagram of a motor unit 10. Fig. 2 is a perspective view of the motor unit 10.
In the following description, the gravity direction is specified with reference to the positional relationship in the case where the motor unit 10 is mounted on a vehicle that is located on a horizontal road surface. Note that in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional rectangular coordinate system.
In the present embodiment, 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). Therefore, in the present specification, the case simply referred to as the upper side refers to the upper side in the gravitational direction. The X-axis direction is a direction orthogonal to the Z-axis direction, and represents a front-rear direction of a vehicle to which the motor unit 10 is mounted, the +x direction is a vehicle front direction, and the-X direction is a vehicle rear direction. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and represents 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, unless otherwise specified, a direction parallel to the motor axis J1 of the motor 1 (a direction parallel to the Y axis) is simply referred to as an "axial direction". The direction of the axial direction and +y side is referred to as one axial direction side, and the-Y side is referred to as the other axial direction side. The radial direction around the motor axis J1 is simply referred to as a "radial direction", and the circumferential direction around the motor axis J1, that is, the direction of the shaft around the motor axis J1 is simply referred to as a "circumferential direction".
The motor axis J1 and a sub axis J3 described later are virtual axes which do not exist in reality.
The motor unit 10 is mounted on the vehicle and rotates the wheel H to advance or retract the vehicle. 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 includes a motor 1, a gear portion 5, an inverter 8, a housing 6 that houses the motor 1, the gear portion 5, and the inverter 8, a shaft holding portion 80 that holds a shaft in the housing 6, a stator holder 40 that holds a stator 35 of the motor 1 in the housing 6, and oil O.
(outer casing)
The housing 6 is for example aluminium die-cast. The housing 6 has: a housing main body 60; a blocking member 67, the blocking member 67 being located on the other axial side (+y side) of the housing main body 60; an inverter cover 68, the inverter cover 68 being located on an upper side of the housing main body 60; and a bottom cover member 69, the bottom cover member 69 being located at the lower side of the housing body 60. That is, the motor unit 10 has a housing main body 60, a blocking member 67, an inverter cover 68, and a bottom cover member 69. The housing 6 is constructed by fastening the housing main body 60, the blocking member 67, the inverter cover 68, and the bottom cover member 69 to each other.
The case main body 60 is provided with a drive body accommodating space 61, an inverter accommodating space 62, and an oil storage space 63. An inverter housing space 62 is disposed above the driving body housing space 61, and an oil storage space 63 is disposed below the driving body housing space.
The driving body accommodating space 61 is a space in which the motor 1, the gear portion 5, the shaft holding portion 80, the stator holder 40, and the oil O are integrally connected. The inverter housing space 62 is a space for housing the inverter 8. The oil storage space 63 is a space for storing the oil O circulating in the driving body accommodating space 61. In this way, the housing main 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 the respective spaces.
A communication hole 65 connected to the oil storage space 63 is provided in a wall surface of the lower side 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 from the communication hole 65. The oil O is stored in the lower region of the driving body storage space 61 and the oil storage space 63.
The oil O circulates in an oil passage 90 provided in the housing 6. The oil O functions as a lubricating oil for lubricating the gear portion 5, and also functions as a cooling oil for cooling the motor 1. As the oil O, it is preferable to use the same oil as the lubricating oil (ATF: automatic Transmission Fluid) for an automatic transmission having a low viscosity.
A part of the ring gear 51 of the gear portion 5, which will be described later, is immersed in the oil O stored in the lower region of the driving body storage space 61. The oil O is lifted by the operation of the ring gear 51 and is diffused into the driving body accommodating space 61. The oil O diffused into the driving body accommodating space 61 is supplied to each gear of the gear portion 5 in the driving body accommodating space 61 and spreads the oil O over the tooth surfaces of the gears. The oil O supplied to the gear portion 5 for lubrication is dropped and collected in the lower region of the driving body accommodating space 61.
The housing main body 60 has: a first opening 61a, the first opening 61a exposing the driving body accommodating space 61 on the other side (+y side) in the axial direction; a second opening 62a, the second opening 62a exposing the inverter housing space 62 at an upper side; and a third opening 63a, the third opening 63a exposing the oil storage space 63 at the lower side. The first opening 61a is covered with the blocking member 67. The second opening 62a is covered with an inverter cover 68. The third opening 63a is covered by the bottom cover member 69.
The housing main body 60 has: a cylindrical portion 60a, the cylindrical portion 60a being centered on the motor axis J1; a bottom 60b, wherein the bottom 60b covers the other axial side of the cylindrical portion 60 a; an expansion portion 60c, the expansion portion 60c expanding in a radial direction from an opening of one axial side of the cylindrical portion 60 a; a box-like portion 60d, the box-like portion 60d being disposed above the tubular portion 60 a; and a storage wall portion 60e, the storage wall portion 60e being located at the lower side of the cylindrical portion 60 a. The box-like portion 60d surrounds the inverter housing space 62. The box-like portion 60d has a second opening 62a. The storage wall portion 60e encloses the oil storage space 63. The storage wall portion 60e has a third opening 63a.
The cylindrical portion 60a surrounds the motor 1 from the radially outer side. The bottom 60b is located on the other side (-Y side) in the axial direction of the motor 1. The bottom 60b has a bearing holding portion 60ba, and the bearing holding portion 60ba holds the ball bearing 71. The bottom 60b supports the output shaft 55 via a ball bearing 71. Further, the bottom 60b supports the oil pump 96.
The expansion portion 60c axially faces the blocking member 67. The expansion portion 60c has: a protruding portion 60ca extending from an opening of the cylindrical portion 60a along a plane orthogonal to the axial direction; an outer edge portion 60cb, the outer edge portion 60cb extending from the protruding portion 60ca toward one axial side (+y side). The blocking member 67 is fastened to the outer edge 60cb by a fastening member such as a bolt.
The blocking member 67 covers the first opening 61 a. The blocking member 67, the cylindrical portion 60a, the bottom portion 60b, and the expansion portion 60c of the housing main body 60 surround the driving body accommodating space 61. Therefore, by disengaging the blocking member 67 from the housing main body 60, the driving body accommodating space 61 is exposed on one side in the axial direction. The shape of the blocking member 67 is a concave shape that opens toward the other side (-Y side) in the axial direction. The stopper member 67 supports a sub-shaft 13 described later via a ball bearing 79. The blocking member 67 rotatably supports a gear housing 52 and a ring gear 51 described later via a tapered roller bearing 77.
According to the present embodiment, the first opening 61a of the housing main body 60 exposes the drive body accommodating space 61 accommodating the motor 1, the gear portion 5, the shaft holding portion 80, and the stator holder 40 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 mounted from the first opening 61a to the inside of the housing main body 60.
The motor unit 10 is assembled by sequentially attaching the motor 1, the gear portion 5, and the like to the inside of the housing main body 60. Generally, the mounting direction of the respective members is aligned to change the posture of the housing main body 60. However, when the weight of the housing main body 60 is large, the step of changing the posture of the housing main body 60 lengthens the working time of the assembly process.
According to the present embodiment, the motor 1, the gear portion 5, the shaft holding portion 80, and the stator holder 40 can be mounted to the housing main body 60 from one direction, and thus the assembly process can be simplified, and the cost required for assembly can be reduced.
Further, according to the present embodiment, the case main body 60 has a bottom 60b that closes off the driving body accommodating space 61 on the other side (-Y side) in the axial direction of the motor 1. Therefore, the member (output shaft 55, etc.) accommodated in the driving body accommodating space 61 on the axial side (+y side) can be supported by the bottom 60b, so that the mounting accuracy can be improved, and the mounting process can be simplified. Further, the bottom 60b is a part of the housing main body 60, and therefore, the other axial side of the driving body accommodating space 61 is previously closed. Therefore, the number of components can be reduced as compared with the case where the driving body accommodating space 61 is opened at both sides in the axial direction, and the assembling process can be simplified.
The box-like portion 60d has a box shape surrounding the inverter 8. The box-like portion 60d opens upward to form a second opening 62a. The box-like portion 60d and the inverter cover 68 constitute a wall surface of the inverter housing space 62. The box-like portion 60d is connected to the upper side of the tubular portion 60 a. A part of the box-like portion 60d is constituted by a part of the tubular portion 60a and the expanded portion 60 c.
The box-like portion 60d has a box bottom portion (partition wall, second wall portion) 60da, which is located between the motor 1 and the inverter 8 in the radial direction of the motor axis J1, a side wall portion 60db (partition wall, first wall portion), which is located on one axial side of the inverter 8 and between the inverter 8 and the gear portion 5, and other side wall portions. The tank bottom 60da is a part of the cylindrical portion 60a and faces the second opening in the up-down direction. The side wall portion 60db is a part of the expansion portion 60c, and extends upward from the tank bottom portion 60 da. The bottom portion 60da and the side wall portion 60db function as partition walls 66 that partition the driving body accommodating space 61 and the inverter accommodating space 62. Further, a through hole 60h is provided in the side wall portion 60 db. The through hole 60h communicates the driving body accommodating space 61 with the inverter accommodating space 62. As described later, the bus bar 9 passes through the through hole 60h.
According to the present embodiment, the case main body 60 has the partition wall 66, and the partition wall 66 divides the driving body accommodating space 61 and the inverter accommodating space 62. That is, according to the present embodiment, the member for housing the motor 1 and the gear portion 5 and the member for housing the inverter 8 are constituted by a single member (housing main body 60). Therefore, the rigidity of the entire housing main body 60 can be improved, and the effect of suppressing vibration can be improved. As a result, the transmission of the vibration caused by the driving of the motor 1 and the gear portion 5 to the inverter 8 can be suppressed, and the load on the inverter 8 can be suppressed.
The inverter cover 68 is fixed to the box-like portion 60d. The inverter cover 68 has a top plate portion 68a extending along a horizontal plane. An inverter 8 is fixed to the back surface of the top plate 68a (i.e., the surface facing the inside of the inverter housing space 62). Thereby, the inverter cover 68 supports the inverter 8.
According to the present embodiment, the inverter 8 is fixed to the inverter cover 68 that can be detached from the housing main body 60. Therefore, when maintenance of the motor unit 10 such as regular maintenance and component replacement is performed, the inverter cover 68 and the case main body 60 are released from the fastening, so that the inverter 8 can be easily detached from the motor unit 10. The above steps can be performed in a state where the motor unit 10 is mounted on the vehicle, and maintenance of the inverter 8 can be improved.
The top plate 68a may be provided with a flow path for the refrigerant for cooling the inverter 8. In this case, the flow path of the refrigerant is provided in the inverter cover 68, and the inverter cover 68 and the case main body 60 in contact with the motor 1 are different members. According to the present embodiment, since the heat of the motor 1 is not easily transferred to the refrigerant, 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 a passage portion (recess 44) described later. In this case, the refrigerant can be shared with the refrigerant cooling the inverter 8 and the refrigerant cooling the motor 1.
(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 of the present embodiment is a three-phase ac motor.
The motor 1 is connected to an inverter 8. The inverter 8 converts a direct current supplied from a battery, not shown, into an alternating current and supplies the alternating current to the motor 1. The inverter 8 is controlled to control each rotation speed of the motor 1.
The motor 1 has a rotor 31 and a stator 35 located radially outward of the rotor 31. The rotor 31 is rotatable about the motor axis J1. The stator 35 has a ring shape. The stator 35 surrounds the rotor 31 from the radially outer side of the motor axis J1.
The rotor 31 includes a motor shaft 32, a rotor core 31a, and a rotor magnet (not shown) held by the rotor core 31 a. That is, the motor 1 has a motor shaft 32.
The rotor 31 (i.e., 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 stacking silicon steel plates. The rotor core 31a is a cylindrical body extending in the axial direction. A plurality of rotor magnets are fixed to the rotor core 31 a. The plurality of rotor magnets are circumferentially arranged in such a manner that the poles alternate.
The motor shaft 32 extends along a motor axis J1 extending in the width direction of the vehicle. The motor shaft 32 is a hollow shaft that opens to both sides in the axial direction of the motor axis J1. That is, the motor shaft 32 has a hollow portion 32h that opens to both sides in the axial direction.
The motor shaft 32 has: a first end portion 32A, the first end portion 32A being located on one axial side (+y side); a second end portion 32B, the second end portion 32B being located on the other axial side (-Y side).
The first end 32A of the motor shaft 32 is rotatably supported by a ball bearing 73. A female spline 32b is provided in an opening of the hollow portion 32h of the first end portion 32A. In the motor shaft 32, the female spline 32B of the second end portion 32B is connected to the input shaft 11 of the gear portion 5.
The second end 32B of the motor shaft 32 is rotatably supported by a 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 the other side (-Y side) in the axial direction than the ball bearing 72 supporting the second end portion 32B.
The stator 35 has: an annular stator core 35a; a coil 35b, the coil 35b being 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 pole teeth protruding radially inward of the motor axis J1. The coil wire is wound around the tooth. The coil wire wound around the tooth constitutes the coil 35b.
The coil 35b has coil side end portions 35c, and the coil side end portions 35c protrude from the stator core 35a to both sides in the axial direction. One coil side end portion 35c protrudes in the axial direction from an end face on one side in the axial direction of the stator core 35a, and the other coil side end portion 35c protrudes in the axial direction from an end face on the other side in the axial direction of the stator core 35 a. The connecting coil 35d extends from the coil-side end 35c on the other axial side. The coil wire 35d includes a twisted coil wire and an insulating tube covering the outer periphery of the coil wire. The motor 1 of the present embodiment is a three-phase ac motor, and therefore has three connection coil wires 35d corresponding to each. The connection coil wire 35d is connected to the inverter 8 via the bus bar 9.
(Gear part)
The gear portion 5 is connected to one side (+y side) in the axial direction of the motor 1. The gear unit 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 for transmitting power between the drive source and the driven device.
The gear portion 5 has an input shaft 11, an input gear 21, a counter shaft 13, a counter shaft 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 about either one of the motor axis J1 and the counter axis J3. In the present embodiment, the motor axis J1 and the counter axis J3 extend parallel to each other. Further, the motor axis J1 and the counter axis J3 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 in the present specification means a direction parallel to the motor axis J1, that is, the 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 axial sides of the motor axis J1. That is, the input shaft 11 has hollow portions 11h that are open on both sides in the axial direction.
The input shaft 11 has: a first end 11A, the first end 11A being located on one axial side (+y side); a second end portion 11B, the second end portion 11B being located on the other side (-Y side) in the axial direction. The input shaft 11 is rotatably supported by the 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 portion 11B of the input shaft 11. The male spline 11a is fitted to the female spline 32b of the motor shaft 32. Thereby, 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 axially coupled to the motor shaft 32. Further, the hollow portion 32h of the motor shaft 32 and the hollow portion 11h of the input shaft 11 communicate with each other. The input shaft 11 is rotated by transmitting the rotation of the motor 1.
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 together with the input shaft 11 about the motor axis J1. In the present embodiment, the input gear 21 and the input shaft 11 are a single member. However, the input gear 21 may be a different member attached to the outer peripheral surface of the input shaft 11.
The auxiliary shaft 13 extends along the auxiliary shaft axis J3. The counter shaft 13 rotates about a counter shaft axis J3. The auxiliary shaft 13 has: a first end portion 13A, the first end portion 13A being located on one axial side (+y side); a second end portion 13B, the second end portion 13B being located on the other side (-Y side) in the axial direction.
The first end portion 13A of the auxiliary shaft 13 is rotatably supported by a ball bearing 79. The second end portion 13B of the auxiliary shaft 13 is rotatably supported by a ball bearing 78. A counter gear 23 and a drive gear 24 are provided between the first end portion 13A and the second end portion 13B in the axial direction on the outer peripheral surface of the counter shaft 13. In the present embodiment, the drive gear 24 is located on one axial side (+y side) of the counter gear.
The counter gear 23 rotates together with the counter shaft 13 about the counter shaft axis J3. The counter gear 23 meshes with the input gear 21.
The drive gear 24 rotates about 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 about 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 centering on 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 torque output from the motor 1 to wheels H of the vehicle. The differential device 50 has a function of absorbing a speed difference between the left and right wheels H and transmitting the same torque to the left and right output shafts 55 when the vehicle turns.
The differential device 50 includes: a gear housing 52, the gear housing 52 being 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 together with the ring gear 51 about the motor axis J1.
The gear housing 52 houses 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 disposed coaxially and facing each other. A pair of pinion gears 53a are supported by the pinion shaft 53b. The pair of side gears 54 are bevel gears that mesh at right angles with the pair of pinion gears 53 a. A pair of side gears 54 are fixed to the output shaft 55, respectively.
The gear housing 52 is rotatably supported by tapered roller bearings 76, 77 from both sides in the axial direction. That is, the ring gear 51 is supported by the tapered roller bearings 76, 77 via the gear housing 52.
The output shaft 55 extends along the motor axis J1. The output shaft 55 rotates about the motor axis J1. The motor unit 10 is provided with a pair of output shafts 55 arranged in the axial direction. A pair of output shafts 55 are connected at one end portions thereof to side gears 54 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 the gears. Further, a pair of output shafts 55 protrude outside the housing 6 at the respective other ends. 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 shaft 55 is arranged coaxially with the motor shaft 32 and the input shaft 11. One of the pair of output shafts 55, which is disposed on the other side in the axial direction (-Y side), passes through the hollow portions 32h, 11h of the motor shaft 32 and the input shaft 11. According to the motor unit 10 of the present embodiment, since a part of the output shaft 55 is disposed inside the motor shaft 32 and the input shaft 11, the motor 1 and the differential device 50 can be disposed coaxially with each other when viewed from the axial direction, and 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 (an input gear 21, a counter gear 23, a drive gear 24, a ring gear 51, a pinion gear 53a, and a side gear 54). The gear portion 5 transmits power from the motor shaft 32 to the output shaft 55 through the plurality of gears. In the power transmission path of the gear portion 5, 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.
(stator holder)
The stator holder 40 includes: a cylindrical portion 41, the cylindrical portion 41 surrounding the stator 35 from the radially outer side; a bottom plate portion 42, the bottom plate portion 42 extending radially inward from an end portion of the other side (-Y side) of the cylindrical portion 41 in the axial direction.
The stator holder 40 is disposed inside the cylindrical portion 60a of the housing main body 60. The cylindrical portion 60a of the housing main body 60 has an opposing inner circumferential surface 60aa facing radially inward. The opposing inner circumferential surface 60aa is radially opposed to the outer circumferential surface 41a of the cylindrical portion 41.
The cylindrical portion 41 has a cylindrical shape centered on the motor axis J1. The outer peripheral surface of the stator 35 is fitted to the inner peripheral surface 41b of the cylindrical portion 41, thereby supporting the stator 35. Thereby, the stator holder 40 supports the stator 35.
An insertion portion 41p is provided on the inner peripheral surface 41b of the cylindrical portion 41. The fitting portion 41p is provided in an opening on one axial side (+y side) of the cylindrical portion 41. The inner diameter of the fitting portion 41p is larger than the inner diameter of the region of the inner peripheral surface 41b into which the stator 35 is fitted. The first holder 81 of the shaft holding portion 80 is fitted into the fitting portion 41p.
A recess (passage portion) 44 recessed in the radial direction is provided on the outer peripheral surface 41a of the cylindrical portion 41. The recess 44 extends throughout the entire circumference around the motor axis J1. The recess 44 opens radially outward. The opening of the recess 44 is covered by the opposing inner peripheral surface 60aa of the housing main body 60.
The concave portion 44 functions as a passage portion through which the refrigerant W flows. The refrigerant W flows in the circumferential direction between the inner wall surface of the recess 44 and the opposing inner peripheral surface 60 aa. The refrigerant W cools the stator 35 via the stator holder 40. The refrigerant W is cooled by passing through a heat exchanger not shown. Therefore, the stator holder 40 and the cylindrical portion 41 of the housing main body 60 function as a water jacket that surrounds the stator 35 and passes the refrigerant W to cool the stator 35.
In the present embodiment, a case will be described in which the recess 44 is provided in the outer peripheral surface 41a of the cylindrical portion 41, and the opening of the recess 44 is covered by the opposing inner peripheral surface 60aa. However, a concave portion may be provided in the opposing inner peripheral surface 60aa, and the opening of the concave portion may be covered by the outer peripheral surface 41a of the cylindrical portion 41. The structure for passing the refrigerant W is not limited to the present embodiment, and a passage portion for passing the refrigerant W may be provided between the outer peripheral surface 41a and the opposing inner peripheral surface 60aa of the cylindrical portion 41.
A pair of fitting portions 46 fitted to the opposing inner peripheral surface 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 one axial side of the recess 44, and the other is located on the other axial side of the recess 44. According to the present embodiment, the stator holder 40 is fitted to the opposing inner peripheral surface 60aa of the housing main body 60 at the fitting portion 46. This can improve the positional accuracy of the stator holder 40 in the radial direction with respect to the housing main body 60.
A pair of grooves 45a are provided on the outer peripheral surface 41a of the cylindrical portion 41. The groove 45a extends over the entire circumference around the motor axis J1. One of the pair of grooves 45a is located on one axial side of the recess 44, and the other is located on the other axial side of the recess 44. The pair of grooves 45a are each disposed between the pair of fitting portions 46 in the axial direction. The groove 45a opens radially outward. The opening of the groove 45a is covered by the opposing inner peripheral surface 60aa of the housing main body 60. An O-ring (sealing portion) 45b is accommodated in each of the pair of grooves 45a. The O-ring 45b is radially compressed by the opposing inner circumferential surface 60aa. Thus, the O-ring 45b functions as a sealing portion.
Further, a groove for accommodating an O-ring compressed by the outer peripheral surface 41a of the cylindrical portion 41 may be provided in the opposing inner peripheral surface 60 aa. That is, the O-ring 45b as the sealing portion may be disposed between the outer peripheral surface 41a and the opposing inner peripheral surface 60aa of the cylindrical portion 41, and may extend in the circumferential direction.
According to the present embodiment, the O-rings 45b are located on both sides in the axial direction of the concave portion 44 as the passage portion of the refrigerant W, respectively. The O-ring 45b suppresses leakage of the refrigerant W from the concave portion 44 to both sides in the axial direction. Further, the oil O in the drive storage space 61 can be prevented from entering between the pair of O-rings 45 b. This suppresses mixing of the oil O with the refrigerant W in the concave portion 44.
The bottom plate portion 42 is located on the other 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. The bottom plate portion 42 is provided at the center thereof with an insertion hole 42a. 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, and the bearing holding portion 43 protrudes from an edge portion of the insertion hole 42a toward one axial side (+y side). The bottom plate portion 42 holds the ball bearing 72. Accordingly, the bottom plate portion 42 can rotatably support the motor shaft 32 via the ball bearing 72.
According to the present embodiment, the stator holder 40 supporting the stator 35 supports the rotor 31 via the ball bearing 72. That is, the only components 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 performing size management of the stator holder 40, the coaxiality of the rotor 31 with respect to the stator 35 can be improved, and the driving efficiency of the motor 1 can be easily improved.
According to the present embodiment, the bottom plate portion 42 of the stator holder 40 holds the ball bearing 72. Therefore, compared with the case where a member for holding the ball bearing 72 is separately provided, the motor unit 10 as a whole can be easily miniaturized in the axial direction. In particular, in the present embodiment, the axial position of the bearing holding portion 43 of the stator holder 40 overlaps with the axial position of the stator 35. This makes it possible to more effectively miniaturize the motor unit 10 in the axial direction.
The output shaft 55 protrudes from an opening on the other side (-Y side) in the axial direction of the motor shaft 32. According to the present embodiment, the output shaft 55 and the motor shaft 32 are supported by ball bearings 71 and 72 arranged in an axial direction, respectively. One of the ball bearings 71 and 72 is held by the housing main body 60, and the other is held by the stator holder 40. According to the present embodiment, the structure of the housing main body 60 can be simplified and the assembly process as a whole can be simplified as compared with the case where both the ball bearings 71, 72 are held in the housing main body 60.
According to the present embodiment, the ball bearing 72 is disposed radially inward of one coil side end 35c located on the other side in the axial direction of the pair of coil side end 35c of the stator 35. More specifically, the axial position of the ball bearing 72 overlaps with the axial position of the one coil side end 35c on the other side in the axial direction. Accordingly, the ball bearing 72 supporting the second end 32B of the motor shaft 32 can be disposed at a position close to the first end 32A. As a result, the ball bearings 72 and 73 supporting the opposite ends of the motor shaft 32 can be disposed close to each other, and the eccentricity of the motor shaft 32 and the like can be suppressed. Further, the oil O that has cooled the coil side end portion 35c and dropped from the coil side 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 bearings 72. The resolver stator 3b is disposed inside the insertion hole 42a and on the other 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 radially outer side. The resolver stator 3b is radially opposed to the resolver rotor 3 a.
The resolver stator 3b and the resolver rotor 3a constitute the resolver 3. That is, the motor unit 10 includes the resolver 3. The resolver 3 measures the rotation speed of the motor shaft 32. The resolver 3 is disposed between the ball bearings 71 and 72 in the axial direction.
According to the present embodiment, since the bottom plate portion 42 of the stator holder 40 supports the resolver stator 3b, the resolver stator 3b can be disposed at a position closer to the center of the axial dimension of the motor 1 than in the case where the housing main body 60 supports the resolver stator 3 b. This can suppress the resolver stator 3b from protruding in the axial direction with respect to the motor 1, and can reduce the axial dimension of the motor unit 10.
(shaft holding part)
The shaft holding portion 80 is disposed in the driving 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 has a first holder 81, a second holder 86, ball bearings 73, 74, 75, 78, and tapered roller bearings 76.
The first holder 81 is fixed to the stator holder 40 from one axial side (+y side). Further, the second holder 86 is fixed to the first holder 81 from the axial side (+y side). The ball bearings 73, 74, 78 are held by a first holder 81. Further, the ball bearing 75 and the tapered 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 holder 81 has a main body disc portion 82 and a protruding disc portion 83. The main body disc portion 82 and the protruding disc portion 83 are a single member that is coupled to each other. The outer shape of the main body disc portion 82 has a larger diameter than the outer shape of the protruding disc portion 83. The protruding disk portion 83 is disposed so as to be offset to one side (+y side) in the radial direction and the axial direction with respect to the main body disk portion 82.
The main body disc portion 82 has a disc 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 disc portion 82. The first insertion hole 82h is circular in shape centered on the motor axis J1 when viewed from the axial direction. The first end 32A of the motor shaft 32, the second end 11B of the input shaft 11, and the output shaft 55 are disposed inside the first insertion hole 82h.
A plurality of screw holes 82s are provided on a surface of one axial side (+y side) of the main body disk portion 82. 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 holder 86 is inserted into the screw hole 82s. That is, the second holder 86 is fixed by a plurality of fixing screws 84 inserted toward the other side (-Y side) in the axial direction with respect to the first holder 81. Accordingly, the second holder 86 can be attached to the first holder 81 from the first opening 61a side in the driving body accommodating space 61, and therefore, the assembling process of the motor unit 10 can be simplified. Further, a plurality of fixing screws 84 are arranged along the circumferential direction of the motor axis J1. Therefore, the second holder 86 can be firmly fixed around the motor axis J1.
The protruding disk 83 has a disk shape centered on the minor axis J3. A second insertion hole 83h penetrating in the axial direction is provided in the center of the protruding disk portion 83. A second end 13B of the auxiliary shaft 13 is disposed inside the second insertion hole 8 h.
As shown in fig. 1, the main body disk portion 82 has an outer edge protruding portion 82c, and the outer edge protruding portion 82c protrudes from the outer edge toward the other 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. Thereby, the first holder 81 is supported by the stator holder 40. Further, the first holder 81 is fixed to the housing main body 60 via the stator holder 40.
The main body disc portion 82 has two bearing holding portions 82a, 82b. The bearing holding portions 82a, 82b are provided at the outer edge of the first insertion hole 82 h.
The bearing holding portion 82a is provided on a surface of the main body disk portion 82 facing the other side (-Y side) in the axial direction. The bearing holding portion 82a holds the ball bearing 73. Thereby, 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 axially between the motor 1 and the gear portion 5. Therefore, the shaft holding portion 80 rotatably supports the motor shaft 32 on one side in the axial direction of the motor 1.
In the present embodiment, the motor 1 and the gear portion 5 are accommodated in the integrated driving body accommodating space 61. Therefore, if the shaft holding portion 80 is not provided, the motor shaft 32 may be cantilevered, and the eccentricity due to the rotation may be significant. According to the present embodiment, the shaft holding portion 80 rotatably holds 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 bearings 72 supporting the second end portion 32B. According to the present embodiment, the eccentricity of the motor shaft 32 can be suppressed, and the rotation efficiency of the motor shaft 32 can be improved.
The bearing holding portion 82b is provided on a surface of the main body disk portion 82 facing one side in the axial direction (+y side). The bearing holding portion 82b holds the ball bearing 74. Thereby, 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 at the outer edge of the second insertion hole 83 h. The bearing holding portion 83a is provided on a surface of the protruding disk portion 83 facing one side in the axial direction (+y side). 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.
According to the present embodiment, the first holder 81 supports not only the shaft (the motor shaft 32 and the input shaft 11) on the motor axis J1 but also the shaft (the counter shaft 13) on the counter shaft axis J3 rotatably. Therefore, by managing the machining accuracy of the first holder 81, the distance dimension between the motor axis J1 and the counter axis J3 can be ensured, and as a result, the power transmission efficiency between gears can be improved. Further, by attaching the first holder 81 to the housing main body 60 in a state where a plurality of bearings (ball bearings 73, 78) are incorporated, the assembly process can be simplified.
The axial positions of the ball bearings 73 and 78 may overlap each other. In addition, the axial positions of the ball bearings 74 and 78 may overlap each other. That is, it is preferable that the axial positions of the plurality of bearings of the shaft holding portion 80 overlap each other. As a result, the axial dimension of the shaft holding portion 80 can be reduced compared to the case where the bearings are arranged in a staggered manner, and the driving body accommodating space 61 can be effectively utilized. In addition, among the plurality of bearings overlapping in the axial direction, the oil O splashed in the radial direction can be supplied from one bearing to the other bearing, and the lubricity of the bearings can be improved.
As shown in fig. 3, the second holder 86 has an enclosing portion 88 and a flange portion 89. The surrounding portion 88 and the flange portion 89 are a single member that is connected to each other.
The surrounding portion 88 is annular and surrounds the motor axis J1 from the radially outer side. The surrounding portion 88 has: a disc portion 88a; and a surrounding cylindrical portion 88b, the surrounding cylindrical portion 88b extending from an outer edge of the disc portion 88a toward the other 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 88 a. The third insertion hole 88h is circular in shape centered on the motor axis J1 when viewed from the axial direction. The output shaft 55 is disposed in the third insertion hole 88h.
The disc portion 88a has two bearing holding portions 88e, 88f. The bearing holding portions 88e, 88f are provided at the outer edge of the third insertion hole 88h.
The surrounding cylindrical portion 88b has a cylindrical shape centered on the motor axis J1. The surrounding cylindrical portion 88b opens to the other side (-Y side) in the axial direction. A notch 88c is provided around the cylindrical portion 88 b. The notch 88c extends from the end portion of the other side (-Y side) in the axial direction surrounding the cylindrical portion 88b toward one side (+y side) in the axial direction. The notch 88c is provided in an upper region in the entire periphery surrounding the cylindrical portion 88 b.
The second holder 86 is fixed to the first holder 81, so that the other axial side (-Y side) of the notch 88c is blocked by the first holder 81. Thus, the notch 88c functions as an opening 87 exposing the inside of the surrounding portion 88 upward.
The flange portion 89 is located at the end portion of the surrounding portion 88 on the other side (-Y side) in the axial direction. More specifically, the flange portion 89 extends radially outward from the other end portion in the axial direction of the surrounding tubular portion 88 b. 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. In order to fix the second holder 86 to the first holder 81, a fixing screw 84 inserted into the screw hole 82s of the first holder 81 is inserted into the through hole 89a. Thereby, the second holder 86 is supported by the first holder 81.
As shown in fig. 1, the bearing holding portion 88f of the second retainer 86 is provided on a surface of the disc portion 88a facing the other side (-Y side) in the axial direction. The bearing holding portion 88f holds the ball bearing 75. Thereby, the bearing holding portion 88f rotatably supports the output shaft 55 via the ball bearing 75.
The bearing holding portion 88e is provided on a surface of the main body disk portion 82 facing one side in the axial direction (+y side). The bearing holding portion 88e holds the tapered roller bearing 76. Thereby, the bearing holding portion 88e rotatably supports the gear housing 52 and the ring gear 51 via the tapered roller bearing 76.
According to the present embodiment, the second holder 86 that supports the output shaft 55 via the ball bearing 75 is fixed to the first holder 81. The first holder 81 supports the motor shaft 32 and the input shaft 11 via ball bearings 73, 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 ensured according to the mounting accuracy of the second holder 86 with respect to the first holder 81. Therefore, the rotation efficiency of the motor shaft 32 and the input shaft 11 is easily improved.
According to the present embodiment, the shaft holding portion 80 has a surrounding portion 88 surrounding the motor axis, and an opening portion 87 that opens in the radial direction of the motor axis J1 is provided in the surrounding portion 88. The opening 87 communicates the inside and outside of the surrounding portion 88. This allows the oil O splashed into the driving body accommodating space 61 by the lift-up of the ring gear 51 to reach the inside of the surrounding portion 88, and the splashed oil O can be supplied to the inside of the surrounding portion 88. The opening 87 of the present embodiment exposes the ball bearings 74 and 75 into the driving body accommodating space 61. Therefore, according to the present embodiment, the oil O can be supplied from the opening 87 to the ball bearings 74 and 75, and the lubricity of the ball bearings 74 and 75 can be improved.
In the present embodiment, the opening 87 is opened upward. Therefore, the oil O reaching the inside of the surrounding portion 88 from the opening 87 can be accumulated in the inside of the surrounding portion 88. That is, the surrounding portion 88 has the oil accommodating space 64 in which the oil supply O is stored. The opening 87 and the oil accommodating space 64 are disposed in the second holder 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 is opened in the oil accommodating space 64. A part of the oil O in the oil accommodating space 64 enters the hollow portion 11h, and the lubricity between the inner peripheral surface of the input shaft 11 and the output shaft 55 is improved. Further, the oil O is supplied to the male spline 11a and the female spline 32b of the connection portion of the input shaft 11 and the motor shaft 32, thereby suppressing the wear of the connection portion. The oil O is splashed from the connection portion of the male spline 11a and the female spline 32b to be supplied to the ball bearing 73 supporting the motor shaft 32, thereby improving the lubricity of the ball bearing 73.
In the present embodiment, 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 accommodating space 64. Therefore, the lower end portion of the input gear 21 is immersed in the oil O stored in the oil storage space 64. The oil O is lifted by the operation of the input gear 21, and spreads into the drive body accommodating space 61 and spreads over the tooth surfaces of the gears.
In the present embodiment, the meshing portion 14 where the input gear 21 meshes with the counter gear 23 is disposed in the opening 87. Therefore, the shaft holding portion 80 can support the shaft on both axial sides of the input gear 21, and transmit power from the input gear 21 to the counter gear 23.
According to the present embodiment, the shaft holding portion 80 has a plurality of bearing holding portions 82a, 82b, 88f, 88e, 83a that hold bearings, respectively. The bearing holders 82a, 82b, 83a are disposed in the first holder 81, and the bearing holders 88f, 88e are disposed in the second holder 86. In this way, since the first holder 81 and the second holder 86 that can be separated from each other each have the bearing holding portion, the first holder 81 and the second holder 86 can be mounted in a state separated from each other, and the assembly process can be simplified. Further, the bearings can be mounted from both axial sides of the first holder 81 and the second holder 86, respectively, and the positional accuracy of the bearings in the axial direction and the radial direction can be improved.
(inverter)
As shown in fig. 1, the inverter 8 is disposed in the inverter housing 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 the alternating current to the motor 1. That is, the inverter 8 controls the current supplied to the motor 1.
The inverter 8 is disposed on the outer peripheral surface side of the motor 1. More specifically, the inverter 8 is located directly above the motor 1. This can reduce the size of the motor unit 10 in the front-rear 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 8 is disposed in the vehicle longitudinal direction with respect to the motor 1. As a result, a collision absorbing region in the vehicle can be ensured significantly.
At least a part of the inverter 8 overlaps the counter gear 23 as viewed in the axial direction. By disposing 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. Bus bar 9 electrically connects motor 1 and inverter 8 together. Since the motor 1 of the present embodiment is a three-phase ac motor, the motor unit 10 includes three inverters 8 corresponding to each motor unit.
The bus bar 9 has: an axial extension 9a, the axial extension 9a extending in the axial direction; and a radial extension 9b, the radial extension 9b extending radially along the motor axis J1.
The other end of the axial direction extending portion 9a in the axial direction (-Y side) is connected to the inverter 8. Further, an end portion of one axial side (+y side) of the axial extension 9a is connected to the radial extension 9 b. The radially extending portion 9b extends radially inward from an end of the axially extending portion and is connected to the connecting coil wire 35d by a tip end thereof. That is, the bus bar 9 is connected to the inverter 8 at the axial extension 9a, and is connected to the connecting coil wire 35d at the radial extension 9 b.
The axial extension 9a passes through a through hole 60h, and the through hole 60h is provided in a partition wall 66 that divides the drive body accommodating space 61 and the inverter accommodating space 62. Thereby, the bus bar 9 is disposed between the driving body accommodating space 61 and the inverter accommodating space 62.
The bus bar 9 is held by a bus bar holder, not shown. The busbar holder has a seal structure disposed between the inner peripheral surface of the through hole 60h and the busbar 9, so as to seal between the driving body accommodating space 61 and the inverter accommodating space 62. Thereby, the bus bar holder suppresses the oil O in the driving body accommodating space 61 from entering the inverter accommodating space 62.
According to the present embodiment, 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 one side in the axial direction of the inverter 8 and is located between the inverter 8 and the gear portion 5. Further, the through hole 60h penetrates the side wall portion 60db in the axial direction. As described above, since the driving body accommodating space 61 is opened to one side in the axial direction (+y side) at the first opening 61a, the assembly worker can mount the bus bar 9 to the housing main body 60 by accommodating the bus bar 9 from the first opening 61a into the driving body accommodating space 61 and inserting the bus bar into the through hole 60 h. According to the present embodiment, the bus bar 9 can be attached to the housing main body 60 from the first opening 61a similarly to other members, and the assembly process can be simplified by attaching the bus bar from one direction.
(oil passage)
The oil passage 90 is a path of oil O circulating the oil O in the housing 6. The oil passage 90 is provided in the housing 6. The oil passage 90 is provided with an oil pump 96.
In the present specification, the term "oil passage" includes not only a "flow passage" that forms a stable flow of oil always in one direction, but also a path (for example, the oil storage space 63) in which the oil supply temporarily stays and a path in which the oil supply drops.
The oil passage 90 has: a first flow path 91 that leads the oil O from the oil storage space 63 to the oil pump 96; and a second flow path 97 extending from the oil pump 96 toward the upper side of the motor 1 and supplying the oil O to the motor 1. The oil O reaches the oil pump 96 from the oil reservoir 63 via the first flow path 91, and is supplied from the oil pump 96 to the motor 1 via the second flow path 97. Further, the oil O is dropped from the motor 1 and returned 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 main body 60. The first flow path 91 is connected to the oil pump 96 from the oil reservoir space 63. On the other hand, the second flow path 97 extends upward from the oil pump 96, diverges, and opens at the upper side of the pair of coil side end portions 35c of the stator 35.
The oil pump 96 is located on the other side (-Y side) in the axial direction of the motor 1. The oil pump 96 is a mechanical pump connected to the output shaft 55 and driven by rotation of the output shaft 55. The oil pump 96 sucks up the oil O from the oil reservoir 63 and pressure-feeds the oil into the oil passage 90.
Fig. 4 is a schematic view of the oil pump 96 as seen from the axial direction.
The oil pump 96 has a pump housing 96a, an external gear 92, and an internal gear 93.
The pump housing 96a is fixed to the bottom 60b of the housing main body 60. In the present embodiment, the pump housing 96a is circular when viewed from the axial direction. The pump housing 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 an axis J2 eccentric to the motor axis J1 when viewed from the axial direction. The suction port 94 and the discharge port 95 are connected to the pump chamber 96 c. An external gear 92 and an internal gear 93 are disposed in the pump chamber 96 c.
The suction port 94 and the discharge port 95 are open on the side surface of the pump chamber 96c facing the other axial side. 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 in the oil O from the suction port 94 and discharges the oil O from the discharge port 95.
The external gear 92 is a gear rotatable about 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 96 c. The external gear 92 has a plurality of teeth 92a on the outer peripheral surface. The tooth shape of the tooth portion 92a of the external gear 92 is a trochoid tooth shape.
The internal gear 93 is an annular gear rotatable about an axis J2 eccentric to the motor axis J1. The external diameter of the internal gear is slightly smaller than the internal diameter of the pump chamber 96 c. The outer peripheral surface of the internal gear 93 slidably opposes the inner peripheral surface of the pump chamber 96 c.
The internal gear 93 surrounds the external gear 92 radially outward and meshes with the external gear 92. The internal gear 93 has a plurality of teeth 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 external gear 92 rotates around the motor axis J1, so that the external gear 92 and the internal gear 93 engaged with the external gear 92 also rotate around the axis J2. Thereby, the gap between the tooth portion 92a of the external gear 92 and the tooth portion 93a of the internal gear 93 moves in the circumferential direction, and the oil pump 96 transfers the oil O in the gap from the suction port 94 to the discharge port 95. Thereby, the oil pump 96 sucks in the oil O from the suction port 94 and discharges the oil O from the discharge port 95.
The oil O discharged from the oil pump 96 is supplied to the pair of coil edge portions 35c via the second flow path 97. The oil O supplied to the coil side end portion 35c permeates the entire coil 35b by the capillary force and gravity acting between the coil wires, and extracts heat from the stator 35. Then, the oil O drops downward, and returns to the oil storage space 63 through the hole provided in the stator holder 40, the communication hole 65, and the like.
According to the present embodiment, since the stator core 35a is cooled by the refrigerant W via the stator holder 40 and the coil side end 35c is directly cooled by the oil O, each portion of the stator 35 can be efficiently cooled.
In the present embodiment, the oil O is stored in the oil storage space 63. A motor 1 is disposed immediately above the oil storage space 63, and a passage portion (recess 44) of the refrigerant W is provided around the motor 1. Therefore, the oil O of the oil storage space 63 is cooled by the refrigerant W. Therefore, the oil O is supplied to the coil side end portion 35c in a state where the temperature has fallen, and the coil side end portion 35c can be cooled efficiently.
(method for manufacturing Motor Unit)
Next, a description will be given of a mounting step of each member to the housing main body 60 as a manufacturing method of the motor unit 10, based on fig. 1.
The method for manufacturing the motor unit 10 mainly includes the following first to ninth steps.
< first procedure >)
The first step is an output shaft mounting step of mounting the output shaft 55 to the housing main body 60. The bottom cover member 69 is pre-installed at the housing main body 60 before the first process. Thereby, the bottom cover member 69 covers the third opening 63a of the housing main body 60.
In the first step, first, a seal member and a ball bearing 71, not shown, are mounted on a bearing holder 60ba provided at the bottom 60b of the housing main body 60. Next, the output shaft 55 is accommodated in the driving body accommodating space 61 from the first opening 61a of the housing main body 60. Next, the output shaft 55 is attached to the housing main body 60 by inserting the end portion of the other side (-Y side) of the output shaft 55 in the axial direction into the ball bearing 71. Next, the oil pump 96 is mounted to the output shaft 55.
< second procedure >)
The second step is a motor mounting step of mounting the motor 1 to the housing main body 60. Before the second step, the rotor 31 and the stator 35 are assembled in advance, respectively. Further, the stator 35 is mounted to the stator holder 40 together with the ball bearing 72 in advance.
In the second step, first, the stator 35 and the stator holder 40 assembled in advance are stored in the driving body storage space 61 from the first opening 61 a. The fitting portion 46 of the stator holder 40 is fitted into the opposing inner peripheral surface 60aa of the cylindrical portion 60a of the housing main body 60. Thereby, the stator holder 40 and the stator 35 are fixed to the housing main body 60.
In the second step, the output shaft 55 is then inserted into the hollow portion 32h of the motor shaft 32, and the rotor 31 is accommodated in the driving body accommodating space 61 from the first opening 61 a.
Through the above steps, in the second step, the motor 1 and the stator holder 40 are accommodated in the driving body accommodating space 61 from the first opening 61a of the housing main body 60 and fixed.
< third procedure >
The third step is a bus bar attachment step of attaching the bus bar 9 to the housing main body 60. In the third step, the three bus bars 9 are housed from the first opening portion 61a of the housing main body 60 to the driving body housing space 61, and are fixed to the housing main body 60 through the through holes 60h of the housing main body 60. Next, the bus bar 9 is connected to a connecting coil wire 35d extending from the stator 35.
< fourth procedure >
The fourth step is a step of attaching the first holder 81 to the stator holder 40. Before the fourth process, the ball bearings 73 and 78 are mounted in advance on the first holder 81.
In the fourth step, first, the first holder 81 is housed from the first opening portion 61a of the housing main body 60 to the driving body housing space 61, and the motor shaft 32 is inserted into the ball bearing 73. Further, the outer edge protruding portion 82c of the first holder 81 is fitted into the fitting portion 41p of the stator holder 40, whereby the first holder 81 is fixed to the housing main body 60 via the stator holder 40. Next, the ball bearing 74 is mounted to the first holder 81.
< fifth procedure >
The fifth step is a step of attaching the input shaft 11, the counter shaft 13, the input gear 21, the counter gear 23, and the drive gear 24 to the housing main body 60. In the fifth step, the input shaft 11, the counter shaft 13, the input gear 21, the counter shaft gear 23, and the drive gear 24 are accommodated in the drive body accommodation space 61 from the first opening 61a of the housing main body 60.
< sixth procedure >
The sixth step is a step of attaching the second holder 86 to the first holder 81. Before the sixth step, the ball bearing 75 and the tapered roller bearing 76 are mounted in advance in the second retainer 86.
In the sixth step, first, the second retainer 86 is stored in the driving body storage space 61 from the first opening 61a of the housing main body 60, and the output shaft 55 is inserted into the ball bearing 75. Further, the second holder 86 is fixed to the first holder 81.
Through the mounting steps of the first holder 81 and the second holder 86 in the fourth step and the sixth step, the shaft holding portion 80 is received from the first opening portion 61a of the housing main body 60 and fixed to the driving body receiving space 61.
< seventh procedure >
The seventh step is a step of attaching the ring gear 51 and the differential device 50 to the shaft holding portion 80. Prior to the seventh process, the differential device 50 is preassembled, and the ring gear 51 is mounted to the gear housing 52 of the differential device 50.
In the seventh step, the gear housing 52 is held by the tapered roller bearing 76, and the output shaft 55 is coupled to the side gear 54 of the differential device 50.
The fifth and seventh steps are gear portion mounting steps for accommodating and fixing the gear portion 5 in the driving body accommodating space 61 from the first opening 61 a.
< eighth procedure >
The eighth step is a step of attaching the blocking member 67 to the housing main body 60. Before the eighth step, the ball bearing 79 and the tapered roller bearing 77 are assembled in advance to the stopper member 67.
In the eighth step, first, the first opening 61a of the housing main body 60 is attached and fastened so as to be covered with the blocking member 67. The counter shaft 13 is inserted into the ball bearing 79, and the gear housing 52 is held by the tapered roller bearing 77.
The first to eighth steps are steps of mounting each member including the motor 1 and the gear portion 5 in the driving body accommodating space 61 of the housing main body 60. In the first to eighth steps, each member is attached to the housing main body 60 from one axial side (+y side). According to the present embodiment, the first to eighth steps can be performed without changing the posture of the housing main body 60, and as a result, the time required for manufacturing the motor unit 10 can be shortened.
< ninth procedure >
The ninth step is a step of attaching the inverter 8 to the case main body 60. Prior to the ninth process, the inverter 8 is mounted to the inverter cover 68 in advance. That is, the process of mounting the inverter 8 has a preliminary process of fixing the inverter 8 to the inverter cover 68.
In the ninth step, the inverter cover 68 to which the inverter 8 is mounted is fixed to the housing main body 60. Thereby, the inverter 8 is disposed in the inverter housing space 62, and the second opening 62a of the case main body 60 is covered by the inverter cover 68. Next, a window (not shown) disposed on the upper surface of the inverter cover is opened, and the bus bar 9 is connected to the inverter 8 in the inverter housing space 62, and the window is again closed.
As described above, in the first to eighth steps, each member is attached to the housing main body 60 from the opening direction of the first opening 61 a. On the other hand, in the ninth step, the inverter 8 and the inverter cover 68 are attached to the housing main body 60 from the opening direction of the second opening 62 a. Therefore, the housing main body 60 is changed in the assembled posture before the ninth process is performed. In the present embodiment, the steps (first to eighth steps) of attaching the motor 1 and the gear portion 5 are performed in a state in which the first opening portion is directed upward. The step of mounting the inverter 8 (ninth step) is performed with the second opening 62a facing upward. This facilitates the assembly work.
While the embodiments and modifications of the present utility model have been described above, the structures and combinations thereof in the embodiments and modifications are examples, and the structures may be added, omitted, replaced, and changed without departing from the spirit of the present utility model. The present utility model is not limited to the embodiments.
Symbol description
1 motor
3 parser
3a resolver rotor
3b resolver stator
5 gear part
6 outer casing
8 inverter
9 bus
10 motor unit
11 input shaft
13 auxiliary shaft
14 engagement portion
21 input gear
23 countershaft gear
31 rotor
32 motor shaft
35 stator
35a stator core
35b coil
35c coil edge end
40 stator holder
41 cylindrical portion
41a outer peripheral surface
41b inner peripheral surface
42 floor section
43 bearing holder
44 concave (passage portion)
45b O ring (sealing part)
46 fitting portion
50 differential device
51 gear ring
55 output shaft
60 housing body
60aa opposed inner peripheral surfaces
60b bottom
60ba bearing holding part
60da bottom of case (partition wall)
60db side wall portion (partition wall, first wall portion)
60h through hole
61 drive body accommodation space
61a first opening portion
62 inverter accommodation space
62a second opening portion
63 oil storage space
63a third opening portion
64 oil accommodating space
66 dividing wall
68 inverter cover
71 ball bearing
72 ball bearing
73 ball bearing (first bearing)
74 ball bearings (fifth bearing)
75 ball bearings (second bearing)
76 taper roller bearing (fourth bearing)
77 tapered roller bearing
78 ball bearing (third bearing)
79 ball bearing
80 shaft holding part
81 first holder
82a bearing holding portion (first bearing holding portion);
82b bearing holder
83a bearing holder
84 fixing screw
86 second retainer
87 opening part
88 surrounding part
88e bearing holder (third bearing holder)
88f bearing holder (second bearing holder)
J1 motor axis
J2 axis
J3 minor axis
O oil
W refrigerant.

Claims (7)

1. A motor unit, comprising:
a motor having a motor shaft extending along a motor axis;
a gear portion connected to one side in an axial direction of the motor;
an inverter that is disposed on an outer peripheral surface side of the motor and that controls a current to be supplied to the motor; and
a housing main body provided with a driving body accommodating space accommodating the motor and the gear portion and an inverter accommodating space accommodating the inverter,
the inverter is disposed on an outer peripheral surface of the motor,
the motor shaft is a hollow shaft,
the gear portion has:
an output shaft, a portion of which is disposed inside the motor shaft, the output shaft rotating about the motor axis; and
a plurality of gears transmitting power from the motor shaft to the output shaft,
the housing main body has a partition wall dividing the drive body accommodation space and the inverter accommodation space,
The housing main body has a first opening portion exposing the drive body accommodating space on one side in the axial direction.
2. A motor unit as claimed in claim 1, wherein,
the housing main body has a bottom portion that closes off the driving body accommodating space on the other side in the axial direction of the motor.
3. A motor unit as claimed in claim 1 or 2, characterized in that,
and a bus bar electrically connecting the motor and the inverter,
a through hole is provided in the partition wall, the through hole communicating the driving body accommodating space with the inverter accommodating space and allowing the bus bar to pass through.
4. A motor unit according to claim 3, wherein,
the partition wall has a first wall portion located on one axial side of the inverter and located between the inverter and the gear portion,
the through hole is arranged on the first wall part.
5. A motor unit as claimed in claim 1 or 2, characterized in that,
further comprising an inverter cover covering a second opening portion exposing the inverter housing space,
the inverter is fixed to the inverter cover.
6. A motor unit as claimed in claim 1 or 2, characterized in that,
Further comprises a shaft holding part which is arranged in the driving body accommodating space,
the shaft holding portion has a first bearing that is axially located between the motor and the gear portion and supports the motor shaft.
7. A motor unit as claimed in claim 6, wherein,
the shaft holding portion has a second bearing that supports the output shaft.
CN202090001102.4U 2020-02-19 2020-09-14 Motor unit Active CN219659532U (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2020-026147 2020-02-19
JP2020026147 2020-02-19
PCT/JP2020/034769 WO2021166302A1 (en) 2020-02-19 2020-09-14 Motor unit and motor unit manufacturing method

Publications (1)

Publication Number Publication Date
CN219659532U true CN219659532U (en) 2023-09-08

Family

ID=77390588

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202090001102.4U Active CN219659532U (en) 2020-02-19 2020-09-14 Motor unit

Country Status (2)

Country Link
CN (1) CN219659532U (en)
WO (1) WO2021166302A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024143510A1 (en) * 2022-12-27 2024-07-04 ニデック株式会社 Drive device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7006486B2 (en) * 2018-04-25 2022-01-24 株式会社アイシン Vehicle drive

Also Published As

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