WO2023188622A1 - Dispositif d'entraînement - Google Patents

Dispositif d'entraînement Download PDF

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Publication number
WO2023188622A1
WO2023188622A1 PCT/JP2022/047299 JP2022047299W WO2023188622A1 WO 2023188622 A1 WO2023188622 A1 WO 2023188622A1 JP 2022047299 W JP2022047299 W JP 2022047299W WO 2023188622 A1 WO2023188622 A1 WO 2023188622A1
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WO
WIPO (PCT)
Prior art keywords
axial
axial direction
rotor
fan
shaft
Prior art date
Application number
PCT/JP2022/047299
Other languages
English (en)
Japanese (ja)
Inventor
健斗 辻本
啓介 麻生
直大 和田
祐輔 牧野
Original Assignee
ニデック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ニデック株式会社 filed Critical ニデック株式会社
Publication of WO2023188622A1 publication Critical patent/WO2023188622A1/fr

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    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Definitions

  • the present invention relates to a drive device.
  • This application claims priority based on Japanese Patent Application No. 2022-061149 filed in Japan on March 31, 2022, the contents of which are incorporated herein.
  • Patent Document 1 discloses a motor that allows air to pass through the inside of a rotor (Patent Document 1).
  • one of the objects of the present invention is to provide a drive device that smoothly guides air into the rotor and improves the cooling efficiency of the motor.
  • One aspect of the drive device of the present invention includes a rotor having a shaft rotatable around a central axis, a motor having a stator facing the rotor with a gap therebetween, and a motor located on one axial side of the rotor.
  • the motor includes a first fan that rotates together with the rotor, a first bearing that is disposed at one axial end of the shaft and rotatably supports the shaft, and a housing that accommodates the motor.
  • the rotor is provided with a first air hole passing through the rotor in the axial direction.
  • the first fan includes a cylindrical tube portion centered on the central axis, and an intake port located radially inside the tube portion and connected to the first air hole.
  • the housing includes a first base portion that covers the motor from one axial side, and a cylindrical first holding portion that protrudes from the other axial surface of the first base portion toward the other axial side. .
  • the first bearing is held inside the first holding part in the radial direction.
  • the first holding portion is located inside the cylindrical portion in the radial direction.
  • the first holding portion and the cylindrical portion at least partially overlap in the axial direction.
  • the first base portion has an inclined surface that faces the other side in the axial direction and slopes toward the other side in the axial direction as it goes radially inward.
  • 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 perspective view of a fan in one embodiment.
  • FIG. 4 is a cross-sectional view of the water jacket of one embodiment.
  • FIG. 5 is a schematic diagram showing the positional relationship between the fins and teeth portions of one embodiment.
  • FIG. 6 is a schematic diagram showing the positional relationship between the fins and teeth portions of a modified example.
  • FIG. 7 is a perspective view of the first bearing holder.
  • 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 plurality of fans 10A, 10B, and a plurality of bearings 5A, 5B, 5C. , 5D.
  • 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 is rotatable around a central axis J1 that extends in the horizontal direction, and a stator 30 that faces the rotor 20 with a gap therebetween.
  • 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 (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.
  • 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 plurality of ventilation holes 24a and 24b are arranged along the circumferential direction.
  • the ventilation holes 24a and 24b have 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 rotor 20 of this embodiment is provided with four first ventilation holes 24a and four second ventilation holes 24b.
  • the cross-sectional shapes of the first ventilation hole 24a and the second ventilation hole 24b are equal to each other.
  • the first ventilation hole 24a and the second ventilation hole 24b have different flow directions of air flowing therein.
  • the rotor core 24 is provided with a shaft insertion hole 24h.
  • the shaft insertion hole 24h extends in the axial direction centering on the central axis.
  • the shaft insertion hole 24h is circular when viewed from the axial direction.
  • the inner diameter of the shaft insertion hole 24h is slightly larger than the outer diameter of the first shaft 21.
  • the first shaft 21 is inserted into the shaft insertion hole 24h.
  • the inner circumferential surface of the shaft insertion hole 24h is provided with a rotation stopper (not shown) that protrudes radially inward and is inserted into a groove (not shown) provided in the outer circumferential surface of the first shaft 21.
  • the first shaft 21 extends along the axial direction centering on the central axis J1.
  • the first shaft 21 is rotatably supported by bearings 5A and 5B.
  • bearings 5A and 5B In the following description, of the pair of bearings 5A and 5B that support the first shaft 21, one located on one side in the axial direction (+Y side) may be referred to as the first bearing 5A, and the other side in the axial direction (- The other bearing located on the Y side) is sometimes referred to as a second bearing 5B.
  • the first bearing 5A is supported by a first bearing holder 6E of the housing 6.
  • the second bearing 5B is supported by the second bearing holder portion 66 of the housing 6.
  • the outer circumferential surface of the first shaft 21 has a flange portion 21f that protrudes radially outward and a male screw portion 21s.
  • the flange portion 21f and the male screw portion 21s are arranged at a distance in the axial direction.
  • the flange portion 21f is arranged on one side in the axial direction (+Y side) than the male screw portion 21s.
  • a nut 21n is attached to the male threaded portion 21s. The flange 21f and the nut 21n sandwich and hold the rotor core 24 from both sides in the axial direction.
  • a rotor portion 29a of the resolver 29 is fixed to the end of the first shaft 21 on one axial side (+Y side).
  • the rotor portion 29a is located on one axial side (+Y side) of the bearing 5A.
  • the rotor portion 29a rotates together with the first shaft 21 around the central axis J1.
  • 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, 31b on one side in the axial direction (+Y side) is defined as a first coil end 31a
  • the other on the other side in the axial direction (-Y side) is defined as a second coil end 31b. That is, the first coil end 31a protrudes from the end face of the stator core 32 on one axial side (+Y side) in the axial direction
  • the second coil end 31b protrudes from the end face of the stator core 32 on the other axial side (-Y side). Projects from the end face to the other side in the axial direction.
  • the first coil end 31a and the second coil end 31b are formed by bundling crossover wires (coil wires) that connect the slots of the stator core 32. Furthermore, in addition to the crossover wire, a neutral point coil wire that connects coil wires of different phases is also bundled at the first coil end 31a. Therefore, in this embodiment, the axial dimension of the first coil end 31a is larger than the axial dimension of the second coil end 31b.
  • the first coil end 31a and the second coil end 31b have a distal end 31P and a proximal end 31Q.
  • the tip portion 31P is the furthest portion of each coil end 31a, 31b from the stator core 32 in the axial direction.
  • the base end portion 31Q is a portion extending from the stator core 32 in each of the coil ends 31a and 31b.
  • the distal end 31P of the first coil end 31a is an end on one axial side (+Y side) of the first coil end 31a
  • the base end 31Q of the first coil end 31a is an axial end of the first coil end 31a. This is the end on the other side ( ⁇ Y side) in the direction.
  • the coil ends 31a, 31b have a base end 31Q located on the end side of the stator core 32 in the axial direction.
  • the distal end 31P of the second coil end 31b is the end on the other axial side (-Y side) of the second coil end 31b
  • the base end 31Q of the second coil end 31b is the end of the second coil end 31b on the other side in the axial direction (-Y side). This is the end on one side in the axial direction (+Y side).
  • the drive device 1 of this embodiment includes a first fan 10A and a second fan 10B as fans 10A and 10B.
  • the first fan 10A and the second fan 10B are fixed to the rotor 20.
  • the first fan 10A and the second fan 10B rotate together with the rotor 20.
  • the first fan 10A and the second fan 10B are located on both sides of the rotor 20 in the axial direction. More specifically, the first fan 10A is located on one axial side (+Y side) of the rotor 20, and the second fan 10B is located on the other axial side ( ⁇ Y side) of the rotor 20.
  • the first fan 10A is located inside the first coil end 31a in the radial direction, and the second fan 10B is located inside the second coil end 31b in the radial direction.
  • the first fan 10A and the second fan 10B have the same shape.
  • the first fan 10A and the second fan 10B are attached to the rotor 20 at different positions and in different orientations.
  • FIG. 3 is a perspective view of the first fan 10A.
  • the structure of the first fan 10A will be specifically explained based on FIG. 3.
  • the second fan 10B has the same shape as the first fan 10A, so a description thereof will be omitted.
  • the first fan 10A is simply referred to as fan 10A, unless it is necessary to distinguish between the first fan 10A and the second fan 10B.
  • the fan 10A includes a fan main body portion 15, a cylindrical portion 13, a plurality of air intake ports 11, and a plurality of air outlet ports 12.
  • the fan 10A is made of, for example, a resin material.
  • the fan main body portion 15 has a disk shape centered on the central axis J1.
  • the fan main body portion 15 has a facing surface 15a, an opposite surface 15b, and an outer circumferential surface 15c.
  • the facing surface 15a and the opposite surface 15b are surfaces facing oppositely to each other in the axial direction.
  • the opposing surface 15a faces the rotor core 24 and contacts a surface of the rotor core 24 facing in the axial direction.
  • the outer peripheral surface 15c is a surface facing outward in the radial direction.
  • the fan main body portion 15 is provided with a central hole 15h.
  • the central hole 15h passes through the fan main body 15 in the vertical direction.
  • the central hole 15h has a substantially circular shape centered on the central axis.
  • a pair of rotation stops 15t are provided on the inner peripheral surface of the central hole 15h.
  • the rotation stopper 15t protrudes radially inward from the inner peripheral surface of the central hole 15h.
  • the first shaft 21 is inserted into the central hole 15h.
  • the inner diameter of the central hole 15h is slightly larger than the outer diameter of the first shaft 21.
  • the rotation stopper 15t is inserted into the groove of the first shaft 21 and suppresses rotation of the fan 10A with respect to the first shaft 21.
  • the outer diameter of the flange 21f provided on the first shaft 21 is larger than the inner diameter of the shaft insertion hole 24h of the rotor core 24 and the fans 10A and 10B. Further, the outer diameter of the male screw portion 21s provided on the first shaft 21 is smaller than the inner diameter of the shaft insertion hole 24h of the rotor core 24 and the fans 10A and 10B.
  • the first fan 10A, rotor core 24, second fan 10B, and nut 21n are inserted into the first shaft 21 in this order from the end on the other axial side (-Y side). Further, the nut 21n is screwed onto the male threaded portion 21s.
  • the opposite surface 15b of the first fan 10A contacts the surface of the flange 21f facing the other axial direction (-Y side).
  • the opposite surface 15b of the second fan 10B contacts the surface of the nut 21n facing one axial side (+Y side).
  • the cylindrical portion 13 has a cylindrical shape centered on the central axis J1.
  • the cylindrical portion 13 of the first fan 10A extends from the outer edge of the fan main body 15 toward one side in the axial direction (+Y side).
  • the cylindrical portion 13 of the second fan 10B is located on the other side in the axial direction from the fan main body 15. (extends to the -Y side). That is, the cylindrical portion 13 extends from the outer edge of the fan main body portion 15 toward the opposite side of the rotor core 24 .
  • the outer circumferential surface of the cylindrical portion 13 extends in the axial direction so as to be continuous with the outer circumferential surface 15c of the fan main body portion 15.
  • the fan 10A of this embodiment is provided with four air intake ports 11 and four air outlet ports 12.
  • the air intake ports 11 and the air outlet ports 12 are arranged alternately in the circumferential direction.
  • the rotor 20 of this embodiment is provided with four first ventilation holes 24a and four second ventilation holes 24b. Seen from the axial direction, the air intake port 11 overlaps with the first air hole 24a, and the air outlet 12 overlaps with the second air hole 24b.
  • the intake port 11 is a through hole that passes through the fan main body 15 in the axial direction.
  • the intake port 11 opens to the facing surface 15a and the opposite surface 15b of the fan main body portion 15.
  • the opening of the opposing surface 15a of the air intake port 11 is connected to the first air hole 24a. That is, the intake port 11 is connected to the first air blow hole 24a.
  • the opening on the opposite surface 15b of the intake port 11 faces the opposite side to the rotor core 24.
  • the intake port 11 is located inside the cylindrical portion 13 in the radial direction.
  • the air outlet 12 is a recess provided in the fan body 15.
  • the air outlet 12 opens on the opposing surface 15a and the outer circumferential surface 15c of the fan main body 15.
  • the opening of the opposing surface 15a of the blower outlet 12 is connected to the second blower hole 24b. That is, the blower outlet 12 is connected to the second blower hole 24b.
  • the opening of the outer circumferential surface 15c of the air outlet 12 faces outward in the radial direction. That is, the air outlet 12 opens radially outward.
  • a plurality of blower fins 12f are provided on the inner surface of the blower outlet 12.
  • one blower outlet 12 is provided with three blower fins 12f.
  • the blower fins 12f protrude toward the rotor 20 from the surface of the air outlet 12 facing the rotor 20 (that is, the surface facing the axial direction). Further, the blower fins 12f extend along the radial direction.
  • the plurality of blower fins 12f are arranged along the circumferential direction.
  • the plurality of blower fins 12f define an opening of the air outlet 12 facing outward in the radial direction along the circumferential direction.
  • the air outlet 12 opens outward in the radial direction. Further, the fan 10A rotates around the central axis J1. Therefore, centrifugal force is applied to the air within the air outlet 12 and the air is blown outward in the radial direction. Furthermore, as the fan 10A rotates, the blower fins 12f provided in the outlet 12 push out the air inside the outlet 12 radially outward and adjust the flow of the air.
  • the first ventilation hole 24a is connected to the intake port 11 of the first fan 10A at one end in the axial direction (+Y side), and is connected to the inlet port 11 of the first fan 10A at the other end in the axial direction (-Y side). It is connected to the air outlet 12 of the second fan 10B.
  • the second ventilation hole 24b is connected to the intake port 11 of the second fan 10B at the other axial end (-Y side), and connected to the first fan 10A at the one axial end (+Y side). It is connected to the air outlet 12.
  • the air in the first ventilation hole 24a and the second ventilation hole 24b of the first fan 10A and the second fan 10B is blown radially outward due to the action of centrifugal force. Accordingly, the insides of the first ventilation hole 24a and the second ventilation hole 24b become negative pressure. Air flows into the first ventilation hole 24a from the intake port 11 of the first fan 10A. Similarly, air flows into the second ventilation hole 24b from the intake port 11 of the second fan 10B. That is, the intake port 11 guides external air into the first ventilation hole 24a and the second ventilation hole 24b.
  • the air outlet 12 of the first fan 10A overlaps the base end 31Q of the first coil end 31a when viewed from the radial direction of the central axis J1.
  • the air outlet 12 of the second fan 10B overlaps the base end 31Q of the second coil end 31b when viewed from the radial direction of the central axis J1. That is, the first coil end 31a is arranged on the radially outer side of the air outlet 12 of the first fan 10A. A second coil end 31b is arranged on the radially outer side of the air outlet 12 of the second fan 10B. Therefore, the first fan 10A and the second fan 10B can cool the first coil end 31a and the second coil end 31b by applying air to them, respectively.
  • the inverter 7 shown in FIG. 1 is electrically connected to 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 arranged 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 reduction gear 4a has a second shaft 44, a third 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, and 46g.
  • 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 .
  • the second shaft 44 rotates around the central axis J1 together with the first shaft 21.
  • the second shaft 44 is rotatably supported by bearings 5C and 5D.
  • the bearing 5C is supported by the second bearing holder portion 66 of the housing 6.
  • the bearing 5D is supported by the gear cover 6C of the housing 6.
  • 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 parallel to the central axis J1.
  • 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, and inverter 7. Housing 6 supports motor 2 , power transmission section 4 , and inverter 7 . Further, the housing 6 supports bearings 5A, 5B, 5C, and 5D.
  • the housing 6 includes an inverter holder 6A, a housing main body 6B, a gear cover 6C, a water jacket 6D, and a first bearing holder 6E.
  • the inverter holder 6A, the housing body 6B, the gear cover 6C, the water jacket 6D, and the first bearing holder 6E 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 first bearing holder 6E are arranged inside the housing body 6B.
  • the housing 6 is provided with a flow path 90 through which the fluid L flows.
  • the fluid L is, for example, water. Note that the fluid L does not have to be water.
  • the fluid L may be oil or other fluid.
  • the flow path 90 includes an external pipe 97 passing through the outside of the housing 6, a first flow path section 91, a second flow path section 92, a third flow path section 93, and a fourth flow path passing through the inside of the housing 6. 94.
  • the fluid L flows inside the housing 6 in the order of the first flow path section 91 , the second flow path section 92 , the third flow path section 93 , and the fourth flow path section 94 .
  • the fluid L mainly cools the inverter in the first flow path section 91 and mainly cools the motor 2 in the third flow path section 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 fluid L is arranged in the path of the external pipe 97.
  • the external pipe 97 sends the low-temperature fluid L into the housing 6 at the first connecting portion 97a, and recovers the fluid L whose temperature has increased by absorbing heat within the housing 6 at the second connecting portion 97b.
  • 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 second bearing holder part 66 that covers the second bearing holder part 66, and a recessed part 65b that opens on the other side in the axial direction (-Y side).
  • the outer cylinder portion 65 surrounds the motor 2 from the outside in the radial direction.
  • the outer cylinder portion 65 is provided with a second flow path portion 92 and a fourth flow path portion 94 .
  • the second flow path portion 92 and the fourth flow path portion 94 are holes provided in the outer cylinder portion 65.
  • the second flow path section 92 extends inside the wall of the outer cylinder section 65 along the axial direction.
  • the second flow path section 92 connects the downstream end of the first flow path section 91 and the inlet section 93a of the third flow path section 93.
  • the fourth flow path section 94 extends along the radial direction.
  • the fourth flow path portion 94 extends radially outward from the outlet portion 93b of the third flow path portion 93 and opens toward the outside of the outer cylinder portion 65 in the radial direction.
  • a second connecting portion 97b of an external pipe 97 is connected to the opening of the fourth flow path portion 94.
  • the second bearing holder 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 configuration of the second bearing holder portion 66 will be explained in more detail later.
  • the gear cover 6C is fixed to the concave portion 65b of the housing body 6B.
  • the gear cover 6C and the concave portion 65b constitute an accommodation space that accommodates the power transmission section 4.
  • Oil O is stored in the accommodation space of the power transmission section 4.
  • the oil O increases the lubricity of the power transmission section 4.
  • 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 portion 91 for cooling the inverter 7 is provided in the inverter holder 6A.
  • the water jacket 6D has a cylindrical inner cylinder part 64 centered on the central axis J1, and a rib 64a provided on the outer peripheral surface of the inner cylinder part 64.
  • 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 cylinder part 64 is arranged inside the outer cylinder part 65. That is, the inner cylinder part 64 is surrounded by the outer cylinder part 65 from the outside in the radial direction.
  • the outer diameter of the inner cylindrical portion 64 is smaller than the inner diameter of the outer cylindrical portion 65.
  • O-rings 64c and 64d are arranged at both axial ends of the outer circumferential surface of the inner cylindrical portion 64, respectively. The O-rings 64c and 64d seal between the outer circumferential surface of the inner cylindrical portion 64 and the outer cylindrical portion 65.
  • a gap is provided between the inner cylinder part 64 and the outer cylinder part 65 and between the pair of O-rings 64c and 64d, which functions as the third flow path part 93.
  • the rib 64a extends spirally around the central axis J1.
  • 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 the gap between the outer circumferential surface of the inner cylindrical portion 64 and the outer cylindrical portion 65 to form a spiral third flow path portion 93.
  • the third flow path portion (water channel) 93 is arranged between the outer cylindrical portion 65 of the housing body 6B and the inner cylindrical portion 64 of the water jacket 6D in the radial direction. More specifically, the third flow path portion 93 is provided radially inside the outer cylinder portion 65 and radially outside the water jacket 6D.
  • the third flow path section 93 extends spirally about the central axis J1.
  • the third flow path section 93 surrounds the stator 30 from the outside in the radial direction.
  • the fluid L flowing through the third flow path portion 93 cools the water jacket 6D. Water jacket 6D contacts stator core 32 and cools stator core 32.
  • the third flow path portion 93 extends in a spiral shape.
  • the third flow path section 93 is not limited to this embodiment as long as it surrounds the stator 30.
  • the third flow path portion 93 may be a flow path that meanders in the axial direction or the circumferential direction.
  • the flow path configuration of the third flow path section 93 can be determined by the shape of the rib 64a.
  • the inner circumferential surface of the inner cylindrical portion 64 includes a fitting inner circumferential surface 50e, a first inner circumferential surface 50f, and a second inner circumferential surface 50g. That is, the inner circumferential surface of the water jacket 6D includes a fitting inner circumferential surface 50e, a first inner circumferential surface 50f, and a second inner circumferential surface 50g.
  • the fitting inner circumferential surface 50e contacts the outer circumferential surface of the stator core.
  • the stator core 32 is held on the fitting inner circumferential surface 50e.
  • the inner diameters of the first inner circumferential surface 50f and the second inner circumferential surface 50g are larger than the inner diameter of the fitting inner circumferential surface 50e.
  • the first inner circumferential surface 50f is located on one axial side (+Y side) of the fitting inner circumferential surface 50e.
  • the second inner circumferential surface 50g is located on the other axial side (-Y side) of the fitting inner circumferential surface 50e.
  • the first inner circumferential surface 50f surrounds the first coil end 31a from the outside in the radial direction via a gap.
  • the end of the first inner circumferential surface 50f on one axial side (+Y side) is located on the one axial side of the tip 31P of the first coil end 31a.
  • the second inner circumferential surface 50g surrounds the second coil end 31b from the outside in the radial direction via a gap.
  • the end of the second inner circumferential surface 50g on the other axial side (-Y side) is located on the other axial side than the tip 31P of the second coil end 31b.
  • the axial dimension of the first coil end 31a is larger than the axial dimension of the second coil end 31b.
  • the axial dimension of the first inner circumferential surface 50f is larger than the axial dimension of the second inner circumferential surface 50g.
  • a first fin (fin) 55A is provided on the first inner peripheral surface 50f.
  • second fins (fins) 55B are provided on the second inner peripheral surface 50g. That is, a plurality of fins 55A, 55B are provided on the inner peripheral surface of the water jacket 6D, which are arranged on the radially outer side of the coil ends 31a, 31b.
  • a first fin 55A and a second fin 55B are provided as fins 55A and 55B on the inner peripheral surface of the water jacket 6D.
  • the first fin 55A is located on the radially outer side of the first coil end 31a.
  • the second fin 55B is located on the radially outer side of the second coil end 31b.
  • the water jacket 6D is cooled by the fluid L flowing through the third flow path section 93.
  • the surface area of the water jacket 6D can be increased and the efficiency of cooling the air in the space surrounded by the water jacket 6D can be increased.
  • the air outlet 12 of the first fan 10A, the first coil end 31a, and the first fin 55A are arranged side by side in the radial direction. Further, the blower outlet 12 opens outward in the radial direction. Air blown out radially outward from the air outlet 12 passes through the first coil end 31a and hits the first fin 55A. Therefore, the air heated when passing through the first coil end 31a can be cooled by hitting the first fins 55A. Thereby, the temperature of the air flowing around the first coil end 31a can be kept low, and the first coil end 31a can be efficiently cooled.
  • the air outlet 12, second coil end 31b, and second fin 55B of the second fan 10B are arranged side by side in the radial direction. Therefore, the same effect as that around the first coil end 31a can be obtained also around the second coil end 31b.
  • the end surface (first end surface 32d) of the stator core 32 that extends orthogonally to the axial direction is arranged on the other axial side (-Y side) of the first fin 55A. Therefore, the air that has reached the first fins 55A from the air outlet 12 changes its flow direction so as to move toward one side in the axial direction. Therefore, the air cooled by the first fins 55A further cools the first coil end 31a while flowing between the first inner peripheral surface 50f and the first coil end 31a. According to this embodiment, the first coil end 31a can be cooled, and the warmed air can be cooled by the first fins 55A.
  • an end face facing the other axial side (-Y side) of the stator core 32 is arranged on one axial side (+Y side) of the second fin 55B. Therefore, the air that has reached the second fin 55B can flow between the second inner peripheral surface 50g and the second coil end 31b, thereby cooling the second coil end 31b and directing the warmed air to the second fin. 55B can be used for cooling.
  • the first coil end 31a of the present embodiment overlaps the air outlet 12 and the first fin 55A at the base end 31Q when viewed from the outside in the radial direction of the central axis J1. That is, the air outlet 12 of the first fan 10A, the base end 31Q of the first coil end 31a, and the first fin 55A are arranged side by side in the radial direction.
  • the second coil end 31b overlaps the air outlet 12 and the second fin 55B at the base end 31Q when viewed from the outside in the radial direction of the central axis J1. That is, the air outlet 12 of the second fan 10B, the base end 31Q of the second coil end 31b, and the second fin 55B are arranged side by side in the radial direction.
  • the connecting wires extending along the circumferential direction are bundled without any gaps. Therefore, it is difficult for the air blown out from the air outlet 12 to smoothly pass through the insides of the coil ends 31a and 31b.
  • the crossover wires of the coil ends 31a and 31b extend in the axial direction from the slot between the teeth portions 32b at the base end 31Q, and gradually curve toward the circumferential direction as they move away from the end surface of the stator core 32.
  • the crossover wire extends in the axial direction at a portion extending from the stator core 32. Therefore, a gap extending along the teeth portion 32b is provided at the base end portion 31Q of the coil ends 31a, 31b.
  • the air blown out from the air outlet 12 is transferred to the diameter of the coil ends 31a, 31b. It can be sent to the outside. Thereby, the air blown out from the air outlet 12 can be applied to the fins 55A and 55B located on the radially outer side of the air outlet 12.
  • FIG. 4 is a cross-sectional view of the water jacket 6D.
  • the plurality of first fins 55A of this embodiment extend along the axial direction and are lined up along the circumferential direction.
  • the second fins 55B extend along the axial direction and are lined up along the circumferential direction.
  • the air that has reached the fins 55A, 55B from the outlet 12 can flow smoothly along the axial direction.
  • the flow velocity of the air circulating around the coil ends 31a, 31b can be increased, and the cooling efficiency of the coil ends 31a, 31b by the air can be increased.
  • the fins 55A and 55B of this embodiment also function as rectifying fins that smooth the flow of air.
  • the fins 55A and 55B of this embodiment become thinner as they move away from the stator core 32 in the axial direction. That is, the first fins 55A become thinner toward one side in the axial direction (+Y side), and the second fins 55B become thinner toward the other side in the axial direction ( ⁇ Y side).
  • the fins 55A, 55B are "slender", it means that the width dimension of the fins 55A, 55B along the circumferential direction is small.
  • the fins 55A and 55B can be made thinner toward the downstream side of the air flow, and as a result, the cross-sectional area of the flow path on the downstream side can be increased. This allows the air to flow more smoothly.
  • the fins 55A and 55B become thinner toward both sides in the axial direction. Therefore, when the water jacket 6D is manufactured by die-casting or the like, the mold configuration can be simplified by making the punching directions on both sides in the axial direction, and the water jacket 6D can be manufactured at low cost.
  • the fins 55A and 55B of this embodiment have a surface facing radially inward (hereinafter referred to as an inner end surface 55a).
  • the inner end surfaces 55a of the fins 55A, 55B slope radially outward as they move away from the stator core 32 in the axial direction.
  • the cross-sectional area of the flow path on the downstream side of the air flowing between the inner surface of the water jacket 6D and the coil ends 31a, 31b can be increased. This allows the air to flow more smoothly.
  • the mold configuration can be simplified by setting the drawing directions to both sides in the axial direction, and the water jacket 6D can be manufactured at low cost.
  • the axial dimension of the first fin 55A is larger than the axial dimension of the first coil end 31a.
  • the axial dimension of the second fin 55B is larger than the axial dimension of the second coil end 31b.
  • the axial dimension of the first fin 55A is larger than the axial dimension of the second fin 55B.
  • the axial dimension of the first coil end 31a is larger than the axial dimension of the second coil end 31b.
  • each coil end 31a, 31b can be cooled according to the amount of heat generated by making the fins 55A, 55B an appropriate size in the axial direction according to the size of the coil ends 31a, 31b.
  • a third flow path section 93 that surrounds the stator 30 from the outside in the radial direction is provided on the radial side of the water jacket 6D.
  • An inlet portion 93 a through which the fluid L flows into the third flow path portion 93 is provided at the upstream end of the third flow path portion 93 .
  • the inlet portion 93a is a connection portion between the third flow path portion 93 and the second flow path portion 92 (see FIG. 1).
  • the inlet portion 93a overlaps with the first fin 55A when viewed from the radial direction.
  • the fluid L flowing through the third flow path section 93 receives heat from the stator 30 and increases in temperature as it moves downstream within the third flow path section 93 . Therefore, the temperature of the fluid L in the third flow path section 93 is lowest near the inlet section 93a.
  • the inlet portion 93a by arranging the inlet portion 93a on the radially outer side of the first fin 55A, the first fin 55A is cooled and passes around the first coil end 31a via the first fin 55A. Air can be effectively cooled.
  • the axial dimension of the first coil end 31a is larger than the axial dimension of the second coil end 31b.
  • the amount of heat generated by the first coil end 31a tends to be larger than the amount of heat generated by the second coil end 31b.
  • the first coil end 31a can be cooled with the low temperature fluid L flowing from the inlet portion 93a via the first fins 55A and air. Thereby, the first coil end 31a can be efficiently cooled.
  • FIG. 5 is a schematic diagram showing the positional relationship between the teeth portion 32b of the stator core 32 and the first fin 55A.
  • the illustration of the coil 31 attached to the stator core 32 is omitted.
  • an extension line TL extending radially outward from a straight line passing through the circumferential center of the teeth portion 32b when viewed from the axial direction is assumed.
  • the extension line TL is a straight line that passes through the central axis J1 and the center of the teeth portion 32b.
  • the recessed portion 55s between the first fins 55A is arranged on the extension line TL of the teeth portion 32b when viewed from the axial direction.
  • the recess 55s extends along the axial direction.
  • a gap is provided in the base end portion 31Q of the first coil end 31a along the teeth portion 32b.
  • the air blown out from the air outlet 12 of the first fan 10A flows along the end surface of the teeth portion 32b on one axial side (+Y side) at the base end 31Q of the first coil end 31a. That is, the air passing through the first coil end 31a flows along the extension line TL, which is the direction in which the teeth portion 32b extends.
  • the air that has passed through the first coil end 31a can be applied to the recess 55s of the first fin 55A.
  • This allows air to flow smoothly in the axial direction along the inner surface of the recess 55s. That is, according to this configuration, the rectifying effect of the first fins 55A can be enhanced, the air can flow easily, and the circulation of the air around the first coil end 31a can be promoted.
  • FIG. 6 is a schematic diagram showing the positional relationship between the first fin 155A and the teeth portion 32b in a modification that can be employed in this embodiment.
  • the illustration of the coil 31 attached to the stator core 32 is omitted.
  • the radially inner surface (inner end surface 155a) of the first fin 155A is arranged on the extension line TL of the teeth portion 32b when viewed from the axial direction.
  • the air that has passed through the first coil end 31a can be directly applied to the convex surface of the first fin 155A, and the contact area between the air and the first fin 55A can be increased. .
  • the air can be efficiently cooled by the first fins 55A. That is, according to this configuration, the heat absorption effect by the first fins 55A can be enhanced to efficiently cool the air.
  • the configuration of this modification can be applied not only to the first fin 55A in the above-described embodiment but also to the second fin 55B.
  • the first bearing holder 6E is arranged on one axial side (+Y side) with respect to the motor 2 inside the housing 6.
  • the first bearing holder 6E is fixed to an end surface on one axial side (+Y side) of the water jacket 6D.
  • the first bearing holder 6E holds the first bearing 5A.
  • the first bearing 5A is arranged at one end of the first shaft 21 in the axial direction (+Y side), and rotatably supports the first shaft 21.
  • the first bearing holder 6E has a first base portion (base portion) 71 and a first holding portion (holding portion) 72. That is, the housing 6 has a first base part 71 and a first holding part 72.
  • the first base portion 71 covers the motor 2 from one side in the axial direction (+Y side).
  • the first base part 71 supports the first holding part 72.
  • FIG. 7 is a perspective view of the first bearing holder 6E.
  • the first base portion 71 has a disk shape centered on the central axis J1.
  • a first holding portion 72 is arranged at the center of the first base portion 71 . That is, the first base portion 71 extends radially outward from the first holding portion 72.
  • the first bearing holder 6E is fixed to the water jacket 6D of the housing 6 at the outer edge 71d of the first base portion 71.
  • the first base portion 71 is provided with a base center hole 71h.
  • the base center hole 71h passes through the first base portion 71 in the axial direction.
  • the base central hole 71h has a circular shape centered on the central axis J1. An end portion of the first shaft 21 on one axial side (+Y side) is inserted into the base center hole 71h.
  • the rotor portion 29a of the resolver 29 is fixed to the end of the first shaft 21 on one axial side (+Y side). Therefore, the rotor portion 29a is arranged on one side in the axial direction (+Y side) with respect to the first base portion 71.
  • the first base portion 71 is also provided with a plurality of through holes. For example, a lead wire extending from the first coil end 31a toward the inverter 7, a thermistor cable, etc. are passed through these through holes.
  • the first holding portion 72 has a cylindrical shape extending along the central axis J1.
  • the first holding portion 72 surrounds the first bearing 5A from the outside in the radial direction and holds the first bearing 5A. That is, the first bearing 5A is arranged radially inside the first holding portion 72.
  • the first holding portion 72 surrounds the base center hole 71h from the outside in the radial direction.
  • the air blown out from the outlet 12 of the first fan 10A flows between the inner peripheral surface of the water jacket 6D and the first coil end 31a in the axial direction on one side (+Y side). This air hits the first base portion 71 of the first bearing holder 6E and flows radially inward along the first base portion 71.
  • the surface of the first base portion 71 facing the other side in the axial direction (-Y side) is referred to as the first guiding surface 71c. That is, the first base portion 71 has a first guiding surface 71c.
  • the first guide surface 71c is provided with a first inclined surface 71a that is inclined toward the other side in the axial direction as it goes radially inward. That is, the first base portion 71 has a first inclined surface 71a that faces the other axial side (-Y side) and slopes toward the other axial side as it goes radially inward.
  • the first base portion 71 can guide the air flowing radially inward along the first guiding surface 71c to the other axial side (-Y side) at the first inclined surface 71a. .
  • the first holding portion 72 is a cylindrical portion that protrudes from the first guiding surface 71c toward the other side in the axial direction ( ⁇ Y side).
  • the air flowing radially inward and axially on the other side (-Y side) along the first guide surface 71c hits the outer peripheral surface of the first holding part 72 and changes the flow direction to the axially other side (-Y side).
  • the first guide surface 71c faces the intake port 11 of the first fan 10A in the axial direction. Therefore, the air that changes its flow direction and flows toward the other side in the axial direction (-Y side) is smoothly sucked into the intake port 11.
  • the surface of the first base portion 71 facing the motor 2 side i.e., the first guiding surface 71c
  • the first guiding surface 71c has a plurality of grooves extending radially along the radial direction.
  • Three fins 70f may be provided. In this case, the heat of the air flowing along the first guide surface 71c can be released to the first bearing holder 6E by the third fins 70f. Further, the air flowing along the first guiding surface 71c can be rectified by the third fins 70f.
  • the first holding portion 72 is located on the radially inner side of the cylindrical portion 13 of the first fan 10A. Further, the first holding portion 72 and the cylindrical portion 13 at least partially overlap in the axial direction. That is, the first holding portion 72 and the cylindrical portion 13 overlap each other when viewed from the radial direction. Therefore, the radially outer side of the air flowing toward the other axial side ( ⁇ Y side) along the outer peripheral surface of the first holding portion 72 can be surrounded by the cylindrical portion 13.
  • the cylindrical portion 13 guides the air flowing to the other side in the axial direction (-Y side) to encourage the air to flow into the intake port 11, thereby making it possible to ensure the amount of air flowing into the intake port 11.
  • the end of the first inclined surface 71a on the other axial side is on the other axial side of the tip 31P on the one axial side (+Y side) of the first coil end 31a. (-Y side).
  • the air flowing radially inward along the first guide surface 71c of the first base portion 71 is applied to the first inclined surface 71a to smoothly move to the other side in the axial direction (-Y side). can be guided to
  • the first inclined surface 71a protrudes toward the motor 2 side, the volume of the space in which the motor 2 is accommodated can be reduced. Thereby, the flow velocity of the air circulated by the fans 10A and 10B within the space in which the motor 2 is accommodated can be increased, and the cooling efficiency of the motor 2 can be increased.
  • the first inclined surface 71a protrudes toward the motor 2, one axial side (+Y side) of the first base portion 71 is recessed.
  • the drive device 1 can be downsized in the axial direction by effectively utilizing the inside of the housing 6, such as by arranging a member (in this embodiment, the resolver 29) in a concave depression.
  • the flange 21f provided on the outer peripheral surface of the first shaft 21 is closer to the other axial side (-Y side) than the end 72a of the first holding part 72 on the other axial side (-Y side). side). According to this embodiment, it is possible to suppress the air flowing along the outer circumferential surface of the first holding part 72 from flowing into the first bearing 5A side. This allows air to flow smoothly into the intake port 11.
  • the flange portion 21f and the cylindrical portion 13 overlap when viewed from the radial direction. Therefore, the flange portion 21f and the cylindrical portion 13 can smoothly guide air flowing between them in the radial direction along the axial direction. Further, the end portion of the collar portion 21f on one axial side (+Y side) is located on the other axial side ( ⁇ Y side) side than the end portion of the cylindrical portion 13 on the one axial side (+Y side). Therefore, it is possible to prevent the flange portion 21f from protruding toward one side in the axial direction (+Y side) with respect to the first fan 10A, and it is possible to prevent the drive device 1 from increasing in size in the axial direction. In addition, the radially outer end of the collar portion 21f is located radially outer than the radially inner end of the intake port 11. Therefore, the flange portion 21f does not block the intake port 11 and does not prevent air from entering the intake port 11.
  • the distance from the first end surface 32d of the stator core 32 on one axial side (+Y side) to the end of the first holding part 72 on the other axial side (-Y side) is the first distance d1.
  • the distance from the first end surface 32d to the tip 31P of the first coil end 31a is defined as a second distance d2.
  • the distance from the first end surface 32d to the end of the first fin 55A on one axial side (+Y side) is defined as a third distance d3.
  • the first distance d1 is smaller than the second distance d2.
  • the second distance d2 is smaller than the third distance d3.
  • the heat of the air is transferred from the air by the first fin 55A to the water jacket while allowing the air to flow smoothly. It can be released to 6D.
  • the configuration of each part (first coil end 31a, first fin 55A, and first holding part 72) on one axial side (+Y side) of the rotor 20 has been described, but on the other axial side (- A similar configuration can be adopted for each part (the second coil end 31b, the second fin 55B, and the second holding part 66b, which will be described later) on the Y side.
  • the first bearing holder 6E of this embodiment is plate-shaped. Further, in this embodiment, a first inclined surface (slanted surface) 71b is provided on the first guide surface 71c of the first base portion 71 facing the other axial direction (-Y side). Therefore, the first base portion 71 protrudes toward the other axial side (-Y side) as it goes radially inward. Further, the surface of the first base portion 71 facing one side in the axial direction (+Y side) is inclined along the first inclined surface 71a. As a result, a recess 71b is provided on one axial side (+Y side) of the first base portion 71. That is, the first base portion 71 has a recessed portion 71b that is recessed from the other axial surface to one axial side.
  • the stator portion 29b of the resolver 29 is fixed to the inner surface of the recess 71b. Further, the stator portion 29b surrounds the rotor portion 29a of the resolver 29 from the outside in the radial direction. That is, the resolver (rotation detection section) 29 is arranged inside the recess 71b.
  • 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 drive device 1 can be downsized.
  • the case where the resolver 29 is accommodated in the recessed part 71b was demonstrated.
  • the device accommodated in the recess 71b may be any other device such as a rotary encoder as long as it is a rotation detector that detects the number of rotations of the rotor 20.
  • the flange 21f is arranged on one axial side of the rotor core 24 in the same direction as the resolver 29.
  • the nut 21n needs to have a sufficient size in the axial direction to ensure engagement with the male threaded portion 21s. Therefore, the axial dimension of the nut 21n tends to be larger than the axial dimension of the flange 21f.
  • the second bearing holder portion 66 faces the first bearing holder 6E in the axial direction.
  • the second bearing holder portion 66 is disposed inside the housing 6 on the other axial side (-Y side) with respect to the motor 2.
  • the second bearing holder section 66 holds the bearings 5B and 5C.
  • the second bearing 5B is arranged at the other axial end (-Y side) of the first shaft 21, and rotatably supports the first shaft 21.
  • the second bearing holder part 66 has a second base part 66a and a second holding part 66b. That is, the housing 6 has a second base portion 66a and a second holding portion 66b.
  • the second base portion 66a covers the motor 2 from the other side in the axial direction ( ⁇ Y side).
  • the second base portion 66a supports the second holding portion 66b.
  • the second base portion 66a has a disk shape centered on the central axis J1.
  • a second holding portion 66b is arranged at the center of the second base portion 66a. That is, the second base portion 66a extends radially outward from the second holding portion 66b.
  • the second holding portion 66b is a cylindrical portion extending along the central axis J1 from the inner edge of the shaft insertion hole 66b. Further, the second holding portion 66b protrudes from the surface of the second base portion 66a on the other axial direction ( ⁇ Y side) toward the other axial direction ( ⁇ Y side).
  • the second holding portion 66b surrounds the second bearing 5B from the outside in the radial direction and holds the second bearing 5B. That is, the second bearing 5B is arranged radially inside the second holding portion 66b.
  • the air blown out from the outlet 12 of the second fan 10B flows between the inner peripheral surface of the water jacket 6D and the second coil end 31b in the other axial direction (-Y side). This air hits the second base portion 66a of the second bearing holder portion 66 and flows radially inward along the second base portion 66a.
  • the surface of the second base portion 66a facing one side in the axial direction (+Y side) is referred to as a second guiding surface 66c. That is, the second base portion 66a has a second guide surface 66c.
  • the second guide surface 66c is provided with a second inclined surface 66d that is inclined toward one side in the axial direction as it goes radially inward. That is, the second base portion 66a has a second inclined surface 66d that faces one axial side (+Y side) and slopes toward the one axial side as it goes radially inward.
  • the second base portion 66a can guide the air flowing radially inward along the second guide surface 66c to one side in the axial direction (+Y side) at the second inclined surface 66d. Further, the air flowing radially inward and to one axial side (+Y side) along the second guiding surface 66c hits the outer peripheral surface of the second holding part 66b and changes the flow direction to one axial side (+Y side). .
  • the second guide surface 66c faces the intake port 11 of the second fan 10B in the axial direction. Therefore, the air that changes its flow direction and flows toward one side in the axial direction (+Y side) is smoothly sucked into the intake port 11.
  • the first base portion 71 of the first bearing holder 6E and the second base portion 66a of the second bearing holder portion 66 each protrude toward the rotor 20 as they go radially inward from the outer edge.
  • the axial dimension of the first base portion 71 is larger than the axial dimension of the second base portion 66a. Note that the axial dimensions of the first base portion 71 and the second base portion 66a mean the protrusion heights of the respective base portions in the axial direction.
  • the axial dimension of the first coil end 31a is larger than the axial dimension of the second coil end 31b.
  • the size of each coil end 31a and 31b can be adjusted. Air can be guided at an inclination according to the According to this embodiment, it is possible to suppress the drive device 1 from increasing in size in the axial direction more than necessary.
  • the first base portion 71 is arranged between the motor 2 and the inverter 7.
  • the first base portion 71 partitions a space in which the motor 2 is accommodated and a space in which the inverter 7 is accommodated within the housing 6. Therefore, by making the first base portion 71 largely protrude toward the motor 2 side, the space in which the inverter 7 is accommodated within the housing 6 can be expanded. Thereby, the inverter 7 can be placed close to the motor 2, and the drive device 1 can be downsized.
  • the second base part 66a is arranged between the motor 2 and the power transmission part 4.
  • the second base portion 66a supports not only a bearing that supports the first shaft 21 of the motor 2, but also a plurality of bearings that support each of the shafts 44 and 45 of the power transmission portion 4. For this reason, the second base part 66a requires high rigidity, and it is preferable to make the dent smaller than the first base part 71. In other words, the second base portion 66a requires high rigidity, and it is preferable that the height of the second base portion 66a protrudes toward the motor 2 side is suppressed compared to the first base portion 71.
  • the power transmission portion 4 can be stably supported.
  • the rotor core 24 is fixed to the first shaft 21 by being sandwiched between the flange 21f and the nut 21n.
  • the rotor core 24 may be fixed to the first shaft 21 in other ways.
  • the arrangement of the collar portion 21f and the nut 21n in this embodiment is merely an example, and is not limited to this embodiment. That is, with respect to the rotor core 24, the flange 21f may be arranged on the other axial side (-Y side), and the nut 21n may be arranged on one axial side (+Y side).
  • the coil is a bendable conducting 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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  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

Un mode de réalisation du dispositif d'entraînement selon la présente invention comprend un moteur, un ventilateur tournant conjointement avec le rotor du moteur, un palier et un boîtier pour loger le moteur. Le rotor est pourvu d'une perforation pénétrant dans la direction axiale. Le ventilateur comporte : une partie cylindre cylindrique centrée sur la ligne d'axe central ; et une entrée positionnée sur l'intérieur de la partie cylindre dans la direction radiale et se raccordant à la perforation. Le boîtier comprend : une partie base recouvrant le moteur depuis un côté dans la direction axiale ; et une partie support cylindrique faisant saillie depuis la surface de la partie base sur l'autre côté dans la direction axiale vers l'autre côté dans la direction axiale. Le palier est supporté sur l'intérieur de la partie support dans la direction radiale. La partie support est positionnée sur l'intérieur de la partie cylindre dans la direction radiale. Au moins des parties de la partie support et de la partie cylindre se chevauchent dans la direction axiale. La partie base comporte une surface inclinée qui fait face à l'autre côté dans la direction axiale et s'incline vers l'autre côté dans la direction axiale vers l'intérieur dans la direction radiale.
PCT/JP2022/047299 2022-03-31 2022-12-22 Dispositif d'entraînement WO2023188622A1 (fr)

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JP2022-061149 2022-03-31

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3004612U (ja) * 1994-05-25 1994-11-22 国産電機株式会社 回転電機用回転子
JPH099575A (ja) * 1995-06-19 1997-01-10 Hitachi Ltd 回転電気機械
JPH0993868A (ja) * 1995-09-28 1997-04-04 Toyo Electric Mfg Co Ltd 車両用主電動機
JPH09182372A (ja) * 1995-12-25 1997-07-11 Toyo Electric Mfg Co Ltd 鉄道車両用主電動機
JP2004312875A (ja) * 2003-04-07 2004-11-04 Toshiba Corp 車両駆動用全閉形電動機
JP2011166908A (ja) * 2010-02-08 2011-08-25 Toshiba Corp 全閉形電動機
JP2011254574A (ja) * 2010-05-31 2011-12-15 Aisin Seiki Co Ltd 回転電機のロータ
JP2013150441A (ja) * 2012-01-19 2013-08-01 Mitsuba Corp アウターロータ型ブラシレスモータ
WO2014174721A1 (fr) * 2013-04-26 2014-10-30 株式会社 豊田自動織機 Machine à induction
JP2020150609A (ja) * 2019-03-11 2020-09-17 株式会社デンソー 電動駆動装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3004612U (ja) * 1994-05-25 1994-11-22 国産電機株式会社 回転電機用回転子
JPH099575A (ja) * 1995-06-19 1997-01-10 Hitachi Ltd 回転電気機械
JPH0993868A (ja) * 1995-09-28 1997-04-04 Toyo Electric Mfg Co Ltd 車両用主電動機
JPH09182372A (ja) * 1995-12-25 1997-07-11 Toyo Electric Mfg Co Ltd 鉄道車両用主電動機
JP2004312875A (ja) * 2003-04-07 2004-11-04 Toshiba Corp 車両駆動用全閉形電動機
JP2011166908A (ja) * 2010-02-08 2011-08-25 Toshiba Corp 全閉形電動機
JP2011254574A (ja) * 2010-05-31 2011-12-15 Aisin Seiki Co Ltd 回転電機のロータ
JP2013150441A (ja) * 2012-01-19 2013-08-01 Mitsuba Corp アウターロータ型ブラシレスモータ
WO2014174721A1 (fr) * 2013-04-26 2014-10-30 株式会社 豊田自動織機 Machine à induction
JP2020150609A (ja) * 2019-03-11 2020-09-17 株式会社デンソー 電動駆動装置

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