WO2023188619A1 - 駆動装置、および駆動装置の製造方法 - Google Patents

駆動装置、および駆動装置の製造方法 Download PDF

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Publication number
WO2023188619A1
WO2023188619A1 PCT/JP2022/047296 JP2022047296W WO2023188619A1 WO 2023188619 A1 WO2023188619 A1 WO 2023188619A1 JP 2022047296 W JP2022047296 W JP 2022047296W WO 2023188619 A1 WO2023188619 A1 WO 2023188619A1
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WO
WIPO (PCT)
Prior art keywords
circumferential surface
inner circumferential
water jacket
stator
axial direction
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.)
Ceased
Application number
PCT/JP2022/047296
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English (en)
French (fr)
Japanese (ja)
Inventor
健斗 辻本
祐輔 牧野
直大 和田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
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
Application filed by Nidec Corp filed Critical Nidec Corp
Priority to CN202280094208.7A priority Critical patent/CN118947041A/zh
Priority to JP2024511235A priority patent/JPWO2023188619A1/ja
Publication of WO2023188619A1 publication Critical patent/WO2023188619A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes 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
    • 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

Definitions

  • the present invention relates to a drive device and a method of manufacturing the drive device.
  • This application claims priority based on Japanese Patent Application No. 2022-061166 filed in Japan on March 31, 2022, the contents of which are incorporated herein.
  • stator core in which band-shaped plate materials are laminated in a spiral manner, the end face facing the axial direction tends to be inclined with respect to a plane perpendicular to the central axis. Therefore, when the stator is fixed to the inner circumferential surface of the housing with the end surface of the stator core as a reference, the stator core is tilted with respect to the central axis. In this case, the air gap between the stator and rotor becomes non-uniform in the circumferential direction, which may reduce the rotational stability of the rotor.
  • one of the objects of the present invention is to provide a drive device that is inexpensive and has high rotational stability, and a method for manufacturing the drive device.
  • One aspect of the drive device of the present invention includes a motor having a rotor that rotates around a central axis and a stator that faces the rotor in the radial direction, and a cylindrical water motor that is open on both sides in the axial direction around the central axis. and a housing for accommodating the motor and the water jacket.
  • the stator has an annular stator core in which strip-shaped plates are helically stacked.
  • the water jacket is arranged radially inside the housing.
  • the water jacket has a shrink-fitting portion that holds the outer peripheral surface of the stator core.
  • a drive device that is inexpensive and has high rotational stability, and a method for manufacturing the drive device.
  • FIG. 1 is a conceptual diagram of a drive device according to an embodiment.
  • FIG. 2 is a partial cross-sectional view of the drive device of one embodiment.
  • FIG. 3 is a schematic diagram showing the structure of a stator core of one embodiment.
  • FIG. 4 is a perspective view showing the second step of the method for manufacturing a drive device according to one embodiment.
  • FIG. 5 is a perspective view showing the third step of the method for manufacturing a drive device according to one embodiment.
  • FIG. 6 is a perspective view showing the third step of the method for manufacturing a drive device according to one embodiment.
  • FIG. 7 is a perspective view showing the fourth step of the method for manufacturing a drive device according to one embodiment.
  • FIG. 8 is a perspective view showing the sixth step of the method for manufacturing a drive device according to one embodiment.
  • an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system.
  • the Z-axis direction indicates the vertical direction (that is, the up-down direction), the +Z direction is the upper side (opposite to the direction of gravity), and the -Z direction is the lower side (the direction of gravity).
  • the X-axis direction is a direction orthogonal to the Z-axis direction, and indicates the front-rear direction of the vehicle in which the drive device 1 is mounted.
  • the Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, and indicates the width direction (left-right direction) of the vehicle.
  • the direction parallel to the central axis J1 of the motor 2 (Y-axis direction) is simply referred to as the "axial direction", and the radial direction centered on the central axis J1 is simply referred to as the "radial direction”.
  • the circumferential direction centered on the central axis J1, that is, the circumferential direction around the central axis J1 is simply referred to as the "circumferential direction.”
  • the above-mentioned "parallel direction” also includes substantially parallel directions.
  • the +Y direction may be simply referred to as one axial direction
  • the -Y direction may simply be referred to as the other axial direction.
  • the X-axis direction may be referred to as the first direction.
  • the Z-axis direction may be referred to as a second direction. That is, the first direction (X-axis direction) is a direction perpendicular to the central axis J1, and the second direction (Z-axis direction) is a direction perpendicular to the central axis J1 and the first direction (X-axis direction).
  • the lower side ie, ⁇ Z side
  • Z-axis direction the lower side
  • FIG. 1 is a conceptual diagram of a drive device 1 of this embodiment.
  • FIG. 2 is a partial cross-sectional view of the drive device 1 of this embodiment.
  • the drive device 1 of this embodiment is mounted on a vehicle that uses a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV), and is used as the power source.
  • a motor such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV)
  • the drive device 1 includes a motor 2, a power transmission section 4, an inverter (control section) 7, a housing 6, a water jacket 6D, a bearing holder 6E, and a plurality of bearings 5A, 5B. , 5C, 5D, 5E, and 5F.
  • the motor 2, the power transmission section 4, and the inverter 7 are arranged on the central axis J1 inside the housing 6.
  • the motor 2 of this embodiment is an inner rotor type three-phase AC motor.
  • the motor 2 has both the functions of an electric motor and a generator. Note that the configuration of the motor 2 is not limited to this embodiment, and may be, for example, a four-phase or more AC motor.
  • the motor 2 includes a rotor 20 that rotates around a central axis J1 that extends in the horizontal direction, and a stator 30 that faces the rotor 20 and a gap.
  • the motor 2 of this embodiment is an inner rotor type motor in which a rotor 20 is arranged inside a stator 30.
  • the rotor 20 includes a first shaft 21, a rotor core 24 fixed to the outer peripheral surface of the first shaft 21, and a rotor magnet (not shown) fixed to the rotor core 24. That is, the rotor 20 is provided with the first shaft 21 . The torque of the rotor 20 is transmitted to the power transmission section 4.
  • the rotor core 24 is provided with a plurality of ventilation holes 24a and 24b.
  • the ventilation holes 24a and 24b penetrate the rotor core 24 in the axial direction.
  • the ventilation holes 24a and 24b open at both end surfaces of the rotor core 24 in the axial direction.
  • the ventilation holes 24a and 24b include a first ventilation hole 24a and a second ventilation hole 24b.
  • the first ventilation holes 24a and the second ventilation holes 24b are arranged alternately along the circumferential direction.
  • the first shaft 21 extends in the axial direction centering on the central axis J1.
  • the first shaft 21 is rotatably supported by a fourth bearing 5A and a second bearing 5B.
  • the fourth bearing 5A rotatably supports the end of the first shaft 21 on one axial side (+Y side).
  • the fourth bearing 5A and the second bearing 5B are arranged around the central axis.
  • the fourth bearing 5A is held by a bearing holder 6E.
  • the second bearing 5B rotatably supports the end of the first shaft 21 on the other axial side ( ⁇ Y side).
  • the second bearing 5B is held at the bottom 66 of the housing 6.
  • the second bearing 5A and the second bearing 5B are ball bearings. Bearings other than ball bearings may be used for the second bearing 5A and the second bearing 5B.
  • the rotor 20 is provided with a pair of fans 10A and 10B.
  • One fan 10A is fixed to an end face of the rotor core 24 on one axial side (+Y side), and the other fan 10B is fixed to an end face of the rotor core 24 on the other axial side ( ⁇ Y side).
  • the fans 10A and 10B suck air from the ventilation holes 24a and 24b of the rotor core 24 and blow the air outward in the radial direction. Thereby, the fans 10A and 10B can flow air into the ventilation holes 24a and 24b, and can also apply the air to the coil ends 31a and 31b of the stator 30. As a result, the air passing through the ventilation holes 24a and 24b can cool the rotor 20.
  • the air applied to the coil ends 31a, 31b circulates around the coil ends 31a, 31b, thereby cooling the coil ends 31a, 31b. Air circulating around the coil ends 31a and 31b is cooled by a water jacket 6D, which will be described later.
  • the stator 30 is held in the housing 6.
  • the stator 30 surrounds the rotor 20 from the outside in the radial direction.
  • the stator 30 includes an annular stator core 32 centered on the central axis J1, a coil 31 attached to the stator core 32, and an insulator (not shown) interposed between the stator core 32 and the coil 31.
  • the stator core 32 has an annular core back portion 32a and a plurality of teeth portions 32b extending radially inward from the core back portion 32a.
  • the plurality of teeth portions 32b are arranged along the circumferential direction.
  • a coil wire is arranged between the teeth portions 32b arranged in the circumferential direction.
  • the coil wire located between adjacent teeth portions 32b constitutes a coil 31. That is, the coil 31 is arranged in the stator core 32.
  • the insulator is made of an insulating material.
  • the coil 31 has a pair of coil ends 31a and 31b that respectively protrude in the axial direction from both end surfaces of the stator core 32 in the axial direction.
  • one of the pair of coil ends 31a and 31b on one side in the axial direction (+Y side) is called the first coil end 31a
  • the other on the other side in the axial direction (-Y side) is called the second coil end 31b. call.
  • the coil 31 is provided with a lead wire 31k.
  • the leader wire 31k extends from the coil 31 to one side in the axial direction (+Y side).
  • the stator 30 of this embodiment has three leader lines 31k corresponding to the U phase, V phase, and W phase.
  • the leader wire 31k is connected to the leader wire connection portion 7a of the inverter 7.
  • FIG. 3 is a schematic diagram showing the structure of the stator core 32 of this embodiment.
  • the stator core 32 of this embodiment is composed of one plate material 8.
  • the plate material 8 is an electromagnetic steel plate.
  • the stator core 32 is constructed by stacking plate materials 8 in a spiral shape.
  • the plate material 8 has a band-shaped portion 8d and a plurality of teeth pieces 8b.
  • Teeth piece 8b has a substantially rectangular shape.
  • the plurality of teeth pieces 8b protrude from one end of the strip portion 8d in the width direction to one side in the width direction.
  • the plurality of teeth pieces 8b are arranged at equal intervals along the length direction of the band-shaped portion 8d.
  • the plate material 8 may be made of amorphous metal or the like instead of the electromagnetic steel plate.
  • the plate materials 8 are stacked in a spiral manner with one side in the width direction from which the teeth pieces 8b protrude as the inner side in the radial direction.
  • the strip portion 8d is laminated while being plastically deformed in a substantially arc shape about the central axis J1.
  • the same number of teeth pieces 8b as the number of slots of the stator core are arranged on the plate material 8 for one spiral turn.
  • the teeth pieces 8b of the plate materials 8 stacked after the second turn of the spiral overlap the teeth pieces 8b of the first turn.
  • a laminate 32p whose thickness direction is in the axial direction is constructed by stacking them in a spiral manner.
  • the stator core 32 is formed by fixing the plate surfaces of the plate members 8 arranged in the axial direction in the laminate 32p to each other in the axial direction by, for example, joining means such as caulking or welding.
  • the stator core 32 can be formed using the strip-shaped plate material 8. Therefore, compared to the case where a plurality of annular plates are prepared and stacked in the axial direction, the material yield when punching the plates can be increased. According to this embodiment, the stator core 32 can be manufactured at low cost.
  • the stator core 32 is configured using one plate material 8.
  • the stator core 32 may be composed of a plurality of plates 8.
  • the laminate 32p may be formed by stacking two plate members 8 in a double spiral.
  • the stator core 32 may be formed by further laminating the laminated bodies 32p formed by laminating one sheet of plate material 8 in a spiral shape in the axial direction.
  • the inverter 7 is electrically connected to the motor 2 at the lead wire connection portion 7a. That is, the inverter 7 has a leader wire connection portion 7a that is connected to the leader wire 31k of the motor 2.
  • the inverter 7 is connected to a battery (not shown) mounted on the vehicle, converts direct current supplied from the battery into alternating current, and supplies the alternating current to the motor 2. Further, the inverter 7 controls the motor 2.
  • the inverter 7 is located on one side (+Y side) of the motor 2 in the axial direction. According to this embodiment, the drive device 1 can be made smaller in the radial direction compared to the case where the inverter 7 is arranged outside the motor 2 in the radial direction.
  • the power transmission section 4 is arranged on the other axial side (-Y side) with respect to the motor 2.
  • the power transmission section 4 is connected to the rotor 20 and transmits the power of the motor 2, and outputs the power to the output shaft 47.
  • the power transmission section 4 includes a reduction gear 4a and a differential gear 4b. Torque output from the motor 2 is transmitted to the differential gear 4b via the reduction gear 4a.
  • the speed reducer 4a is a parallel shaft gear type speed reducer in which the rotation axes of each gear are arranged in parallel.
  • the differential device 4b transmits the same torque to both the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle turns.
  • the speed reduction device 4a has a second shaft 44, a third shaft (shaft) 45, a first gear 41, a second gear 42, and a third gear 43.
  • the differential device 4b includes a ring gear 46g, a differential case 46, and a differential mechanism section 46c disposed inside the differential case 46. That is, the power transmission section 4 has a plurality of gears 41, 42, 43, 46g and a plurality of shafts 44, 4.
  • the second shaft 44 extends in the axial direction centering on the central axis J1.
  • the second shaft 44 is arranged coaxially with the first shaft 21.
  • the second shaft 44 is connected at one axial end (+Y side) to the other axial end ( ⁇ Y side) of the first shaft 21 . That is, the second shaft 44 is connected to the first shaft 21 from the other axial side.
  • the second shaft 44 rotates around the central axis J1 together with the first shaft 21.
  • the second shaft 44 is rotatably supported by the third bearing 5C and the fifth bearing 5D.
  • the third bearing 5C and the fifth bearing 5D are arranged around the central axis J1.
  • the third bearing 5C is held at the bottom 66 of the housing 6.
  • the fifth bearing 5D is held by the gear cover 6C of the housing 6.
  • the third bearing 5C and the fifth bearing 5D are ball bearings.
  • other types of bearings may be used for the third bearing 5C and the fifth bearing 5D.
  • the first gear 41 is provided on the outer peripheral surface of the second shaft 44.
  • the first gear 41 rotates together with the second shaft 44 around the central axis J1.
  • the third shaft 45 rotates around an intermediate axis J2 that is parallel to the central axis J1.
  • the third shaft 45 is rotatably supported by the first bearing 5E and the sixth bearing 5F.
  • the first bearing 5E is supported by the bottom 66 of the housing 6.
  • the sixth bearing 5F is supported by the gear cover 6C of the housing 6.
  • the second gear 42 and the third gear 43 are arranged side by side in the axial direction.
  • the second gear 42 and the third gear 43 are provided on the outer peripheral surface of the third shaft 45.
  • the second gear 42 and the third gear 43 are connected via a third shaft 45.
  • the second gear 42 and the third gear 43 rotate about the intermediate axis J2.
  • the second gear 42 meshes with the first gear 41.
  • the third gear 43 meshes with a ring gear 46g of the differential device 4b.
  • the ring gear 46g rotates around an output axis J3 that is parallel to the central axis J1. Torque output from the motor 2 is transmitted to the ring gear 46g via the reduction gear 4a. Ring gear 46g is fixed to differential case 46.
  • the differential case 46 includes a case portion 46b that accommodates a differential mechanism portion 46c therein, and a differential case shaft 46a that protrudes to one side and the other side in the axial direction with respect to the case portion 46b. That is, the power transmission section 4 includes a differential case shaft 46a.
  • the differential case shaft 46a has a cylindrical shape that extends in the axial direction centering on the output axis J3.
  • Ring gear 46g is provided on the outer peripheral surface of differential case shaft 46a. The differential case shaft 46a rotates together with the ring gear 46g about the output axis J3.
  • the pair of output shafts 47 are connected to the differential gear 4b.
  • a pair of output shafts 47 protrude from the differential case 46 of the differential device 4b to one side and the other side in the axial direction.
  • the output shaft 47 is arranged inside the differential case shaft 46a.
  • the output shaft 47 is rotatably supported on the inner peripheral surface of the differential case shaft 46a via a bearing.
  • the torque output from the motor 2 is transmitted to the ring gear 46g of the differential device 4b via the second shaft 44, first gear 41, second gear 42, third shaft 45, and third gear 43 of the motor 2, It is output to the output shaft 47 via the differential mechanism section 46c of the differential device 4b.
  • the plurality of gears 41, 42, 43, and 46g of the power transmission section 4 transmit the power of the motor 2 to the second shaft 44, the third shaft 45, and the differential case shaft 46a in this order.
  • Housing 6 accommodates motor 2, power transmission section 4, inverter 7, water jacket 6D, and bearing holder 6E. Housing 6 supports motor 2, power transmission section 4, inverter 7, water jacket 6D, and bearing holder 6E. Further, the housing 6 supports bearings 5A, 5B, 5C, and 5D.
  • the housing 6 includes an inverter holder 6A, a housing body 6B, and a gear cover 6C.
  • the inverter holder 6A, the housing body 6B, and the gear cover 6C are each separate members.
  • the inverter holder 6A is arranged on one axial side (+Y side) of the housing body 6B.
  • the gear cover 6C is arranged on the other axial side (-Y side) of the housing body 6B.
  • the water jacket 6D and the bearing holder 6E are arranged inside the housing body 6B.
  • the housing 6 is provided with a circulation passage 90 through which the cooling water L flows.
  • the cooling water L is, for example, water. Note that the cooling water L may be oil or another fluid.
  • the circulation flow path 90 includes an external pipe 97 passing through the outside of the housing 6 , a first flow path 91 , a second flow path 92 , a third flow path 93 , and a fourth flow path 94 passing through the inside of the housing 6 . , has.
  • the cooling water L flows inside the housing 6 in the order of the first flow path 91 , the second flow path 92 , the third flow path 93 , and the fourth flow path 94 .
  • the cooling water L mainly cools the inverter in the first flow path 91 and mainly cools the motor 2 in the third flow path 93.
  • the external piping 97 is connected to the inverter holder 6A at a first connection part 97a, and connected to the housing main body 6B at a second connection part 97b.
  • a radiator (not shown) that cools the cooling water L is arranged in the path of the external piping 97.
  • the external piping 97 sends low-temperature cooling water L into the housing 6 at the first connection portion 97a, and recovers the cooling water L whose temperature has increased by absorbing heat within the housing 6 at the second connection portion 97b.
  • the inverter holder 6A accommodates and supports the inverter 7.
  • the inverter holder 6A covers an opening on one axial side (+Y side) of the housing body 6B.
  • a first flow path 91 for cooling the inverter 7 is provided in the inverter holder 6A.
  • a first connecting portion 97a of an external pipe 97 is connected to the opening of the first flow path 91.
  • the housing body 6B accommodates the motor 2 and is open on one side in the axial direction (+Y side).
  • the housing main body 6B includes a cylindrical outer cylinder part 65 centered on the central axis J1, and an opening on the other axial side of the outer cylinder part 65, which is arranged on the other axial side (-Y side) of the outer cylinder part 65. It has a bottom portion 66 for covering, and a recessed portion 67 that opens on the other side in the axial direction ( ⁇ Y side). That is, the housing 6 has a bottom portion 66 that covers the opening on the other axial side of the housing 6 .
  • the outer cylinder portion 65 surrounds the motor 2 from the outside in the radial direction.
  • a second flow path 92 and a fourth flow path 94 are provided in the outer cylindrical portion 65 .
  • a third flow path 93 is provided inside the outer cylinder portion 65 in the radial direction.
  • the second flow path 92 and the fourth flow path 94 are holes provided in the outer cylinder portion 65.
  • the second flow path 92 extends inside the wall of the outer cylinder portion 65 along the axial direction.
  • the second flow path 92 connects the downstream end of the first flow path 91 and the inlet portion 93a of the third flow path 93.
  • the fourth flow path 94 extends along the radial direction.
  • the fourth flow path 94 extends radially outward from the outlet portion 93b of the third flow path 93 and opens radially outward of the outer cylinder portion 65.
  • a second connecting portion 97b of an external pipe 97 is connected to the opening of the fourth flow path 94.
  • the inner circumferential surface of the outer cylindrical portion 65 includes a first inner circumferential surface 65a, a second inner circumferential surface 65b, a third inner circumferential surface 65c, a fourth inner circumferential surface 65d, and a first stepped surface 65e. and a second step surface 65f. That is, the housing 6 includes a first inner circumferential surface 65a, a second inner circumferential surface 65b, a third inner circumferential surface 65c, a fourth inner circumferential surface 65d, a first stepped surface 65e, and a second stepped surface 65f.
  • the first inner circumferential surface 65a, the second inner circumferential surface 65b, the third inner circumferential surface 65c, and the fourth inner circumferential surface 65d are surfaces facing inward in the radial direction.
  • the first inner circumferential surface 65a, the second inner circumferential surface 65b, the third inner circumferential surface 65c, and the fourth inner circumferential surface 65d extend from the other axial side (-Y side) toward one axial direction (+Y side). Line up in this order.
  • the first inner circumferential surface 65a, the second inner circumferential surface 65b, the third inner circumferential surface 65c, and the fourth inner circumferential surface 65d are cylindrical surfaces whose diameters increase in this order.
  • the first inner circumferential surface 65a is located on one axial side (+Y side) of the bottom portion 66 and is connected to the outer edge of the bottom portion 66.
  • the second inner circumferential surface 65b is located on one side (+Y side) of the first inner circumferential surface 65a in the axial direction.
  • the second inner peripheral surface 65b has a larger diameter than the first inner peripheral surface 65a.
  • the third inner circumferential surface 65c is located on one axial side (+Y side) of the second inner circumferential surface 65b.
  • the third inner peripheral surface 65c has a larger diameter than the second inner peripheral surface 65b.
  • the fourth inner circumferential surface 65d is located on one axial side (+Y side) of the third inner circumferential surface 65c.
  • the fourth inner peripheral surface 65d has a larger diameter than the third inner peripheral surface 65c.
  • the fourth inner circumferential surface 65d is a tapered surface that widens radially outward toward one axial side (+Y side).
  • the first step surface 65e and the second step surface 65f are surfaces facing one side in the axial direction (+Y side).
  • the first step surface 65e and the second step surface 65f have a substantially annular shape when viewed from the axial direction.
  • the first stepped surface 65e is located between the first inner circumferential surface 65a and the second inner circumferential surface 65b.
  • the first stepped surface 65e connects the end of the first inner circumferential surface 65a on one axial side (+Y side) and the end of the second inner circumferential surface 65b on the other axial side ( ⁇ Y side).
  • the second stepped surface 65f is located between the second inner circumferential surface 65b and the third inner circumferential surface 65c.
  • the second step surface 65f connects the end of the second inner circumferential surface 65b on one axial side (+Y side) and the end of the third inner circumferential surface 65c on the other axial side ( ⁇ Y side).
  • the second step surface is inclined toward one side in the axial direction (+Y side) as it goes radially outward.
  • the bottom portion 66 is provided with a shaft insertion hole 66h.
  • a pair of bearings 5B and 5C and a seal member 5S are arranged in the shaft insertion hole 66h.
  • the bearing 5B supports the first shaft 21, and the bearing 5C supports the second shaft 44.
  • the first shaft 21 and the second shaft 44 are connected to each other inside the shaft insertion hole 66h.
  • the seal member 5S is arranged between the two bearings 5B and 5C in the axial direction.
  • the seal member 5S seals between the inner peripheral surface of the shaft insertion hole 66h and the outer peripheral surface of the second shaft 44.
  • the bearings 5B and 5C are ball bearings. However, other types of bearings may be employed as the bearings 5B and 5C.
  • the bottom portion 66 is provided with a recessed portion 66c that opens on the other side in the axial direction ( ⁇ Y side).
  • the recess 66c has a substantially circular shape centered on the intermediate axis J2 when viewed from the axial direction.
  • the recess 66c holds the first bearing 5E. That is, the inner peripheral surface of the recess 66c surrounds the first bearing 5E intermediate axis J2 from the outside in the radial direction.
  • the first bearing 5E is a ball bearing.
  • the first bearing 5E may be another type of bearing.
  • the gear cover 6C is fixed to the concave portion 67 of the housing body 6B.
  • the gear cover 6C and the concave portion 67 constitute an accommodation space that accommodates the power transmission section 4.
  • Fluid O is stored in the accommodation space of the power transmission section 4.
  • the fluid O can improve the lubricity of the power transmission section 4.
  • the first bearing 5E is held at the bottom portion 66.
  • the first bearing 5E overlaps the first step surface 65e when viewed from the axial direction.
  • the radial thickness of the first inner circumferential surface 65a is the same as that of the second inner circumferential surface 65b, the third inner circumferential surface 65c, and the fourth inner circumferential surface. It is thicker than the radial thickness at the inner peripheral surface 65d.
  • the radial thickness of the first inner circumferential surface 65a of the housing 6 is the radial thickness of the outer cylinder portion 65 at the radially outer portion of the first inner circumferential surface 65a.
  • the diameter of the outer cylindrical portion 65 of the radially outer portion of each inner circumferential surface is Thickness in direction.
  • the first inner peripheral surface 65a is closest to the bottom 66 among the inner peripheral surfaces of the housing 6 in the axial direction.
  • the rigidity of the outer cylindrical portion 65 in the vicinity of the first bearing 5E can be increased. Therefore, even if a large force is applied to the outer cylinder part 65 from the first bearing 5E via the bottom part 66, deformation of the outer cylinder part 65 can be suppressed.
  • the force applied from the first bearing 5E to the housing 6 is assumed to be a force when press-fitting the first bearing 5E during assembly, a vibration transmitted from the first bearing 5E during driving, a force transmitted from a gear, etc.
  • At least a portion of the first bearing 5E is disposed radially outward of the central axis J1 relative to the first seal member 64c.
  • the first bearing 5E is press-fitted into a recess 66c provided in the bottom 66.
  • at least a portion of the first bearing 5E is disposed radially outward than the first seal member 64c, so that deformation of the bottom portion 66 when the first bearing 5E is press-fitted is caused by the outer cylindrical portion. 65, it is difficult to be transmitted to the first inner circumferential surface 65a that contacts the first seal member 64c. Thereby, the sealing performance between the outer cylinder part 65 and the inner cylinder part 64 by the first seal member 64c can be sufficiently ensured.
  • first bearing 5E first bearing 5E, second bearing 5B, and third bearing 5C
  • the second bearing 5B and the third bearing 5C are arranged with their positions shifted in the axial direction.
  • the first bearing 5E is located between the second bearing 5B and the third bearing 5C in the axial direction.
  • the outer cylindrical portion 65 is provided with an opening 61 that opens radially outward with respect to the central axis J1. That is, the housing 6 is provided with an opening 61. In the opening 61, the leader wire connecting portion 7a is exposed to the outside in the radial direction.
  • the opening 61 is covered by a lid 61c. The lid 61c prevents dust, moisture, and the like from entering into the housing 6 through the opening 61.
  • the leader wire connecting portion 7a When the opening 61 is viewed from the radial direction of the central axis J1, the leader wire connecting portion 7a is arranged in a region surrounded by the inner edge 61a of the opening 61. According to the housing 6 of this embodiment, the leader wire connection portion 7a can be exposed to the outside in the radial direction from the opening 61. A worker or an assembly device (hereinafter referred to as a worker or the like) can insert the tool K through the opening 61 and connect the leader wire 31k to the leader wire connecting portion 7a. Therefore, it is possible to adopt an assembly method in which the motor 2 and the inverter 7 are housed inside the housing 6 and then the motor 2 and the inverter 7 are connected.
  • the motor 2 and inverter 7 are assembled inside the housing 6. can be connected.
  • the process of assembling the motor 2 to the housing body 6B and the process of assembling the inverter 7 to the inverter holder 6A can be performed simultaneously, and the assembly process This makes it possible to improve efficiency.
  • the water jacket 6D includes a cylindrical inner cylinder portion 64 centered on the central axis J1, a rib 64a, and a guide flange 64b. Further, the water jacket 6D has a fixing part (not shown). The fixing portion protrudes radially outward from the end of the inner cylinder portion 64 on one axial side (+Y side). The water jacket 6D is bolted to the housing 6 at a fixed portion.
  • the inner cylinder part 64 is arranged inside the outer cylinder part 65. That is, the water jacket 6D is arranged inside the housing 6 in the radial direction.
  • the inner cylinder portion 64 surrounds the stator 30 from the outside in the radial direction. That is, water jacket 6D surrounds stator 30 from the outside in the radial direction.
  • the inner circumferential surface of the inner cylindrical portion 64 includes a fifth inner circumferential surface 50e, a sixth inner circumferential surface 50f, and a seventh inner circumferential surface 50g. That is, the inner circumferential surface of the water jacket 6D includes a fifth inner circumferential surface 50e, a sixth inner circumferential surface 50f, and a seventh inner circumferential surface 50g.
  • the inner diameter of the fifth inner circumferential surface 50e is smaller than the inner diameters of the sixth inner circumferential surface 50f and the seventh inner circumferential surface 50g.
  • the sixth inner circumferential surface 50f is located on one axial side (+Y side) of the fifth inner circumferential surface 50e.
  • the seventh inner circumferential surface 50g is located on the other axial side (-Y side) of the fifth inner circumferential surface 50e.
  • the sixth inner circumferential surface 50f surrounds the first coil end 31a from the outside in the radial direction via a gap.
  • the radial gap between the sixth inner circumferential surface 50f and the first coil end 31a becomes a flow path for air sent by the fan 10A.
  • the seventh inner circumferential surface 50g surrounds the second coil end 31b from the outside in the radial direction via a gap.
  • the radial gap between the seventh inner circumferential surface 50g and the second coil end 31b becomes a flow path for air sent by the fan 10B.
  • the fifth inner circumferential surface (shrink fitting portion) 50e contacts the outer circumferential surface of the stator core.
  • the water jacket 6D of this embodiment is fixed to the outer peripheral surface of the stator core 32 by shrink fitting.
  • the shrink fitting step the water jacket 6D is heated to increase the diameter of the fifth inner circumferential surface 50e, and the stator core 32 is inserted radially inside the fifth inner circumferential surface 50e to cool the water jacket 6D.
  • the fifth inner circumferential surface 50e comes into close contact with the outer circumferential surface of the stator core 32 and holds the stator core 32.
  • the fifth inner circumferential surface 50e functions as a shrink-fitting portion that holds the outer circumferential surface of the stator core 32. That is, the water jacket 6D has a shrink-fit portion (fifth inner circumferential surface 50e) that holds the outer circumferential surface of the stator core 32.
  • the stator core 32 of this embodiment is formed by stacking strip-shaped plate materials 8 (see FIG. 3) in a spiral manner. Therefore, the end face of the stator core 32 tends to be inclined with respect to a plane (XZ plane) perpendicular to the central axis J1. Therefore, it is conceivable to fix the stator core 32 to the housing 6 by shrink-fitting the housing 6 to the outer peripheral surface of the stator core 32.
  • the drive device 1 is miniaturized by integrating the inverter 7 and the power transmission section 4 with the motor 2, the shape of the housing 6 is also not a simple cylindrical shape.
  • the housing 6 of this embodiment includes a bottom portion 66 that covers the opening of the outer cylinder portion 65, an opening portion 61 for electrically connecting the inverter 7 and the motor 2, and a recessed portion 67 surrounding the power transmission portion 4. (See FIG. 1) etc. It has a complicated shape. If the housing 6 is heated during shrink fitting, the inner peripheral surface of the housing 6 tends to become uneven in the radial direction, making it difficult to stably fix the stator 30.
  • the outer peripheral surface of the stator core 32 is held by the water jacket 6D by shrink fitting, and the water jacket 6D is further fixed to the housing 6.
  • the water jacket 6D has a cylindrical shape with openings on both sides in the axial direction about the central axis J1.
  • the water jacket 6D tends to spread uniformly in the radial direction when shrink fitting is performed. Therefore, by shrink-fitting the water jacket 6D and fixing it to the stator core 32, the water jacket 6D can stably hold the stator 30.
  • the stator 30 can be fixed to the housing 6 with high precision.
  • the stator 30 can be assembled to the housing 6 with high precision. Thereby, the relative positional accuracy between the stator 30 and the rotor 20 can be improved, and the drive device 1 with high rotational stability in which the air gap between the stator 30 and the rotor 20 is made uniform in the circumferential direction can be provided.
  • the radial thickness at the fifth inner circumferential surface 50e is thicker than the radial thickness at the sixth inner circumferential surface 50f and the seventh inner circumferential surface 50g.
  • the fifth inner circumferential surface 50e functions as a shrink-fitting portion and holds the stator 30.
  • the outer circumferential surface of the inner cylindrical portion 64 includes a first outer circumferential surface 50a, a second outer circumferential surface 50b, a third outer circumferential surface 50c, a fourth outer circumferential surface 50d, and a third step surface 50h. That is, the outer circumferential surface of the water jacket 6D includes a first outer circumferential surface 50a, a second outer circumferential surface 50b, a third outer circumferential surface 50c, a fourth outer circumferential surface 50d, and a third step surface 50h.
  • the first outer circumferential surface 50a, the second outer circumferential surface 50b, the third outer circumferential surface 50c, and the fourth outer circumferential surface 50d are surfaces facing outward in the radial direction.
  • the first outer circumferential surface 50a, the second outer circumferential surface 50b, the third outer circumferential surface 50c, and the fourth outer circumferential surface 50d are arranged in this order from the other axial side (-Y side) to the one axial side (+Y side). .
  • the second outer circumferential surface 50b has the smallest diameter and the third outer circumferential surface 50c has the largest diameter.
  • the first outer circumferential surface 50a faces the first inner circumferential surface 65a of the outer cylindrical portion 65.
  • the first outer peripheral surface 50a fits into the first inner peripheral surface 65a.
  • the fitting portion between the first outer circumferential surface 50a and the first inner circumferential surface 65a is located on the other axial side (-Y side) with respect to the fifth inner circumferential surface 50e that is shrink-fitted to the outer circumferential surface of the stator core 32. do. That is, the first inner circumferential surface 65a and the first outer circumferential surface 50a fit together on the other axial side (-Y side) of the fifth inner circumferential surface 50e.
  • the first outer circumferential surface 50a is disposed offset in the axial direction with respect to the fifth inner circumferential surface 50e, so that the first outer circumferential surface 50a is less susceptible to dimensional changes caused by residual stress. , can be smoothly fitted to the first inner circumferential surface 65a.
  • a groove 50k extending along the circumferential direction is provided on the first outer peripheral surface 50a.
  • a first seal member 64c is arranged in the groove 50k.
  • the first seal member 64c of this embodiment is a seal member such as an O-ring.
  • the wire diameter of the first seal member 64c is larger than the depth of the groove 50k.
  • the opening of the groove 50k is covered by the first inner circumferential surface 65a.
  • the first seal member 64c is compressed in the radial direction between the bottom surface of the groove 50k and the first inner peripheral surface 65a. That is, the first seal member 64c is arranged between the first inner circumferential surface 65a and the first outer circumferential surface 50a.
  • a guide flange 64b is arranged between the first outer circumferential surface 50a and the second outer circumferential surface 50b.
  • the guide flange 64b is provided on the outer peripheral surface of the inner cylindrical portion 64.
  • the guide flange 64b projects radially outward with respect to the first outer circumferential surface 50a and the second outer circumferential surface 50b.
  • the outer edge of the guide flange 64b has a substantially circular shape centered on the central axis J1 when viewed from the axial direction.
  • the tip of the rib 64a contacts the inner circumferential surface of the outer cylindrical portion 65, or faces the inner circumferential surface of the outer cylinder portion 65 with a slight gap therebetween.
  • a third flow path 93 is provided on one axial side (+Y side) of the guide flange 64b. Further, the first stepped surface 65e of the outer cylinder portion 65 is arranged on the other axial side ( ⁇ Y side) of the guide flange 64b. The surface of the guide flange 64b facing the other axial direction faces the first stepped surface 65e.
  • the second outer circumferential surface 50b faces the second inner circumferential surface 65b of the outer cylinder portion 65.
  • a gap functioning as a third flow path 93 is provided between the second outer circumferential surface 50b and the second inner circumferential surface 65b. That is, a third flow path (flow path) 93 is provided between the second inner peripheral surface 65b and the second outer peripheral surface 50b.
  • the third flow path 93 extends spirally about the central axis J1.
  • the third flow path 93 surrounds the stator 30 from the outside in the radial direction. Heat generated from the stator 30 and the like is transmitted to the second inner circumferential surface 65b.
  • the second inner circumferential surface 65b comes into contact with the cooling water L flowing through the third flow path 93 and absorbs heat therefrom.
  • the other axial end ( ⁇ Y side) of the second outer circumferential surface 50b of this embodiment is located on the other axial side than the other axial end of the stator core 32. Further, the end portion of the second outer circumferential surface 50b on the one axial side (+Y side) is located on the one axial side than the end portion of the stator core 32 on the one axial side. Therefore, the second outer circumferential surface 50b covers the entire area of the stator core 32 in the axial direction, and can transfer the heat of the entire area of the stator core 32 in the axial direction to the cooling water L.
  • a rib 64a is provided on the second outer peripheral surface 50b.
  • the rib 64a projects radially outward from the second outer circumferential surface 50b.
  • the rib 64a extends spirally about the central axis J1 on the second outer circumferential surface 50b.
  • the rib 64a has a tip located at the radially outer end. The tip of the rib 64a contacts the inner circumferential surface of the outer cylindrical portion 65, or faces the inner circumferential surface of the outer cylinder portion 65 with a slight gap therebetween.
  • the rib 64a partitions a gap between the outer circumferential surface of the inner cylindrical portion 64 and the outer cylindrical portion 65 to form a third spiral flow path 93. More specifically, the space surrounded by the rib 64a, the second outer circumferential surface 50b, and the second inner circumferential surface 65b becomes the third flow path 93.
  • the third flow path 93 extends spirally.
  • the third flow path 93 is not limited to this embodiment as long as it surrounds the stator 30.
  • the third flow path 93 may be a flow path meandering in the axial direction or the circumferential direction.
  • the flow path configuration of the third flow path 93 can be determined by the shape of the rib 64a.
  • the third outer circumferential surface 50c faces the third inner circumferential surface 65c of the outer cylinder portion 65.
  • the third outer peripheral surface 50c fits into the third inner peripheral surface 65c.
  • the fitting portion between the third outer circumferential surface 50c and the third inner circumferential surface 65c is located on one side in the axial direction (+Y side) with respect to the fifth inner circumferential surface 50e that is shrink-fitted to the outer circumferential surface of the stator core 32. . That is, the third inner circumferential surface 65c and the third outer circumferential surface 50c fit together on one axial side (+Y side) of the fifth inner circumferential surface 50e.
  • the third outer circumferential surface 50c is disposed offset in the axial direction with respect to the fifth inner circumferential surface 50e, so that the third outer circumferential surface 50c is less susceptible to dimensional changes caused by residual stress. , can be smoothly fitted to the third inner circumferential surface 65c.
  • the third outer circumferential surface 50c is provided with a groove 50s extending along the circumferential direction.
  • a second seal member 64d is arranged in the groove 50s.
  • the second seal member 64d of this embodiment is a seal member such as an O-ring.
  • the wire diameter of the second seal member 64d is larger than the depth of the groove 50s.
  • the opening of the groove 50s is covered by the third inner peripheral surface 65c.
  • the second seal member 64d is compressed in the radial direction between the bottom surface of the groove 50s and the third inner peripheral surface 65c. That is, the second seal member 64d is arranged between the third inner circumferential surface 65c and the third outer circumferential surface 50c.
  • the third outer peripheral surface 50c has a larger diameter than the second outer peripheral surface 50b. Therefore, a third stepped surface 50h facing the other axial side (-Y side) is provided between the third outer circumferential surface 50c and the second outer circumferential surface 50b.
  • the third step surface 50h has a substantially annular shape when viewed from the axial direction.
  • the third stepped surface 50h connects the end of the second outer peripheral surface 50b on one axial side (+Y side) and the end of the third outer peripheral surface 50c on the other axial side ( ⁇ Y side).
  • a third flow path 93 is provided on the other axial side (-Y side) of the third stepped surface 50h.
  • a chamfered portion is provided on the outer edge of the third stepped surface 50h. The chamfered portion of the outer edge of the third stepped surface 50h faces the second stepped surface 65f of the outer cylindrical portion 65.
  • a pair of seal members 64c and 64d are arranged on both sides of the third flow path 93 in the axial direction.
  • the seal members 64c and 64d seal between the outer circumferential surface of the inner cylindrical portion 64 and the outer cylindrical portion 65 to suppress leakage of the cooling water L from the third flow path 93 to one side and the other side in the axial direction. do.
  • the inner circumferential surface (first inner circumferential surface 65a, second inner circumferential surface 65b, third inner circumferential surface 65c, and fourth inner circumferential surface 65d) of the housing 6 of this embodiment is located on one side in the axial direction, which is the opening direction. It has a stepped shape in which the diameter increases toward the +Y side. Therefore, the water jacket 6D can be smoothly inserted into the housing 6 from one side in the axial direction (+Y side).
  • the fourth inner circumferential surface 65d of the housing 6 is tapered. Therefore, the water jacket 6D can be smoothly inserted into the housing 6 from one axial side (+Y side).
  • the housing 6 of this embodiment has two different inner circumferential surfaces (a first inner circumferential surface 65a and a third inner circumferential surface 65c) disposed in a stepped manner, and seal members 64c, 64d between the water jacket 6D and the water jacket 6D. Insert. Therefore, when the water jacket 6D is inserted into the housing 6, twisting of the seal members 64c and 64d is suppressed, and the water jacket 6D can be smoothly inserted into the housing 6.
  • the bearing holder 6E holds the fourth bearing 5A.
  • the bearing holder 6E is arranged inside the housing 6 on one axial side (+Y side) with respect to the motor 2.
  • the bearing holder 6E has a base portion 71 and a holding portion 72.
  • the base portion 71 has a substantially disk shape centered on the central axis J1.
  • a holding part 72 is arranged at the center of the base part 71.
  • the base portion 71 is provided with a central hole.
  • the central hole passes through the base portion 71 in the axial direction.
  • the central hole has a substantially circular shape centered on the central axis J1. The end of the first shaft 21 on one axial side (+Y side) is inserted into the central hole.
  • the holding portion 72 has a cylindrical shape extending along the central axis J1.
  • the holding portion 72 surrounds the fourth bearing 5A from the outside in the radial direction and holds the fourth bearing 5A.
  • the holding portion 72 surrounds the central hole from the outside in the radial direction.
  • the stator portion 29b of the resolver 29 is fixed to the base portion 71.
  • a rotor portion 29a of the resolver 29 is fixed to an end portion of the first shaft 21 on one axial side (+Y side).
  • the stator portion 29b surrounds the rotor portion 29a from the outside in the radial direction.
  • the rotor portion 29a has a plurality of magnets arranged along the circumferential direction.
  • the stator section 29b includes a coil that is excited by changes in magnetic flux accompanying the rotation of the rotor section 29a, and measures the number of rotations of the rotor 20.
  • the bearing holder 6E is fixed to the end surface of the water jacket 6D on one axial side (+Y side). Further, the stator core 32 is fixed to the inner peripheral surface of the water jacket 6D by shrink fitting. Therefore, the bearing holder 6E and stator 30 of this embodiment are positioned with respect to the water jacket 6D. According to this embodiment, it is easy to improve the relative positional accuracy of the rotor 20 and the stator 30, which are supported by the bearing holder 6E via the fourth bearing 5A.
  • the manufacturing method of the drive device 1 of this embodiment mainly includes a first step, a second step, a third step, a fourth step, a fifth step, a sixth step, a seventh step, an eighth step, and a ninth step. and has.
  • the first step is a step of manufacturing the stator 30.
  • a band-shaped plate material 8 is punched out from a base material such as an electromagnetic steel plate by press working. Further, the punched band-shaped plate materials 8 are stacked in a spiral manner to form an annular stacked body 32p.
  • the stator core 32 is formed by joining the plate members 8 arranged in the axial direction of the laminate 32p by caulking or welding or other fixing means. Next, the coil wire is passed through the gap between the teeth of the stator core 32 to form a coil.
  • the second to seventh steps are performed using the pedestal 9 and the holding device 19.
  • Pedestal 9 is used to support and position stator 30 and water jacket 6D.
  • the holding device 19 is used to hold the stator 30.
  • the pedestal 9 has a base plate portion 9d, a disk portion 9a, four pillar portions 9b, and an annular portion 9c.
  • the base plate portion 9d is plate-shaped and installed on the floor of a factory or the like. Further, the base plate portion 9d may be placed on a conveyor for automatic conveyance.
  • a disk portion 9a is fixed to the upper surface of the base plate portion 9d.
  • the disk portion 9a has a disk shape centered on a jig center axis J9 that extends vertically.
  • the column portion 9b is fixed to the upper surface of the disk portion 9a. The column portion 9b extends upward from the upper surface of the disk portion 9a.
  • the four pillar portions 9b are arranged at equal intervals in the circumferential direction around the jig center axis J9.
  • the annular portion 9c is fixed to the upper end portions of the four pillar portions 9b.
  • the annular portion 9c has an annular shape centered on the jig center axis J9.
  • the outer diameter of the annular portion 9c is approximately equal to the outer diameter of the disc portion 9a.
  • the annular portion 9c faces the disc portion 9a vertically with a gap therebetween.
  • the holding device 19 is movable in the vertical direction along the jig center axis J9.
  • the holding device 19 includes a holding base portion 19d, a plurality of gripping portions 19a, and a plurality of positioning protrusions 19b.
  • the holding base portion 19d has a disk shape centered on the jig center axis J9.
  • the plurality of gripping parts 19a and the plurality of positioning protrusions 19b extend downward with respect to the holding base part 19d.
  • the plurality of gripping parts 19a are arranged in a line along the circumferential direction of the jig center axis J9.
  • the grip portion 19a is driven by a drive portion (not shown) and can move in parallel to the jig center axis J9 inward and outward in the radial direction.
  • the holding device 19 grips the stator 30 by moving the gripping portion 19a radially outward while the gripping portion 19a is inserted inside the stator core 32.
  • the plurality of positioning convex portions 19b extend downward with respect to the holding base portion 19d.
  • the plurality of positioning convex portions 19b are arranged in a line along the circumferential direction of the jig center axis J9.
  • the lower end surfaces of the plurality of positioning convex portions 19b are arranged on the same plane. Furthermore, the lower end surface of the positioning convex portion 19b is located above the lower end portion of the grip portion 19a.
  • FIG. 4 is a perspective view showing the second step of the method for manufacturing the drive device 1.
  • the stator 30 is aligned.
  • the axial direction of the stator 30 is aligned with the vertical direction.
  • the stator 30 is placed on the pedestal 9.
  • the central axis J1 of the stator 30 is made to coincide with the jig central axis J9, and the position of the stator 30 with respect to the pedestal 9 is determined.
  • the end faces of the stator core 32 facing in the axial direction one facing upward in the second step will be referred to as an upper end face, and the other facing downward will be referred to as a lower end face.
  • the outer edge of the lower end surface of the stator core 32 is mounted on the upper surface of the annular portion 9c of the pedestal 9. Further, a coil end protruding downward from the lower end surface of the stator core 32 is inserted inside the annular portion.
  • the third step is a step of holding the stator 30 by the holding device 19 and moving the stator 30 above the pedestal 9.
  • the jig center axis J9 of the holding device 19 and the center axis J1 of the stator 30 are aligned, and the holding device 19 is placed above the stator 30.
  • the holding device 19 is moved in the axial direction of the jig center axis J9 to bring the lower end surface of the positioning convex portion 19b into contact with the upper end surface of the stator core 32.
  • the holding device 19 stores the position of the holding device 19 shown in FIG.
  • the holding device 19 moves the plurality of gripping portions 19a radially outward in a state in which the positioning convex portion 19b is in contact with the upper end surface of the stator core 32. As a result, the grip portion 19a comes into contact with the inner surface of the stator core 32, and the holding device 19 holds the stator 30.
  • the holding device 19 is moved upward. Thereby, the holding device 19 can move the stator 30 upward with respect to the pedestal 9.
  • FIG. 7 is a perspective view showing the fourth step of the method for manufacturing the drive device 1.
  • the water jacket 6D is aligned.
  • the axial direction of the water jacket 6D is aligned with the vertical direction. Furthermore, the water jacket 6D is placed on the pedestal 9. Thereby, the central axis J1 of the water jacket 6D is made to coincide with the jig central axis J9, and the position of the water jacket 6D with respect to the pedestal 9 is determined.
  • the fifth step is a step of heating and expanding the water jacket 6D.
  • the water jacket 6D is heated, for example, by high-frequency induction heating.
  • a heating coil is disposed inside the water jacket 6D and a high frequency current is passed through the heating coil to generate an eddy current on the surface of the water jacket 6D to heat it.
  • the water jacket 6D expands and increases its inner diameter as the temperature increases.
  • FIG. 8 is a perspective view showing the sixth step of the method for manufacturing the drive device 1.
  • the sixth step is a step in which the stator 30 is moved downward by the holding device 19 and positioned inside the water jacket 6D.
  • the stator 30 is held by a holding device 19.
  • the stator 30 moves downward while being held by the holding device 19.
  • the memory of the holding device 19 stores the position of the stator 30 mounted on the pedestal 9 in the third step.
  • the position of the stator 30 relative to the water jacket 6D on the pedestal 9 is determined based on the position stored in the third step, and the stator 30 is placed in the water jacket 6D.
  • the seventh step is a step of fixing the water jacket 6D and the stator 30 to each other by radiating heat from the water jacket 6D and returning the inner diameter of the water jacket 6D to the size before expansion.
  • the seventh step is performed until the inner diameter of the water jacket 6D becomes sufficiently small and the temperature reaches such a temperature that the stator 30 can be fixed.
  • the seventh step may be natural heat dissipation, or may be a step of lowering the temperature of the water jacket 6D by actively cooling.
  • the holding of the stator 30 by the holding device 19 is maintained until the temperature of the water jacket 6D is sufficiently reduced.
  • the eighth step is a step of inserting and fixing the water jacket 6D to which the stator 30 is fixed inside the outer cylindrical portion 65 of the housing 6 shown in FIG. 2.
  • the eighth step first, the water jacket 6D to which the stator 30 is fixed is inserted into the outer cylindrical portion 65 from an opening on one axial side (+Y side) of the outer cylindrical portion 65.
  • the water jacket 6D is brought into contact with the housing 6 in the axial direction, and a fixing part (not shown) is fastened using a bolt or the like.
  • step of arranging the rotor 20 inside the stator 30 in the radial direction a step of fixing the bearing holder 6E to the water jacket 6D, and a step of attaching an inverter to the housing body 6B in advance.
  • a step of fixing the inverter holder 6A to which the inverter holder 7 is fixed is performed.
  • the ninth step is a step of connecting the stator 30 and the inverter inside the housing 6.
  • the outer cylindrical portion 65 of the housing 6 is provided with an opening 61 that opens radially outward with respect to the central axis J1.
  • the operator or the like opens the opening 61 and inserts the tool K through the opening 61.
  • a worker or the like connects the leader wire 31k extending from the coil 31 of the motor 2 and the leader wire connecting portion 7a of the inverter 7 using a tool K.
  • the coil is a bendable conducting wire (coil wire) attached to the stator, and the leader wire extending from the coil has a structure in which a plurality of conducting wires are bundled using crimp terminals.
  • the coil is a segment coil made of a highly rigid rectangular wire, and the leader wire extending from the coil may also be a single rectangular wire.

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  • Manufacturing & Machinery (AREA)
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PCT/JP2022/047296 2022-03-31 2022-12-22 駆動装置、および駆動装置の製造方法 Ceased WO2023188619A1 (ja)

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JPH0713411Y2 (ja) * 1986-03-18 1995-03-29 日産自動車株式会社 内燃機関用の水冷式オルタネ−タ
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JP2018207561A (ja) * 2017-05-30 2018-12-27 ファナック株式会社 固定子及び回転電機
JP2019068567A (ja) * 2017-09-29 2019-04-25 株式会社日立製作所 ラジアルギャップ型回転電機、その製造装置及びその製造方法
WO2019159522A1 (ja) * 2018-02-19 2019-08-22 アイシン・エィ・ダブリュ株式会社 回転電機の冷却構造
CN214007547U (zh) * 2020-12-28 2021-08-20 浙江工业职业技术学院 一种新型氢燃料电池用无油空压机

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