WO2019156119A1 - Motor drive device for vehicle - Google Patents

Motor drive device for vehicle Download PDF

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Publication number
WO2019156119A1
WO2019156119A1 PCT/JP2019/004245 JP2019004245W WO2019156119A1 WO 2019156119 A1 WO2019156119 A1 WO 2019156119A1 JP 2019004245 W JP2019004245 W JP 2019004245W WO 2019156119 A1 WO2019156119 A1 WO 2019156119A1
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WO
WIPO (PCT)
Prior art keywords
stator
motor
casing
axis
drive device
Prior art date
Application number
PCT/JP2019/004245
Other languages
French (fr)
Japanese (ja)
Inventor
直哉 竹内
四郎 田村
真也 太向
Original Assignee
Ntn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 Ntn株式会社 filed Critical Ntn株式会社
Priority to CN201980012064.4A priority Critical patent/CN111758205A/en
Publication of WO2019156119A1 publication Critical patent/WO2019156119A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present invention relates to a motor driving device for driving wheels, and to a structure for fixing a stator of a motor unit to a casing of the motor unit.
  • Patent Document 1 a motor that drives a wheel is known.
  • Patent Document 1 relates to a stator housed in a housing, and at three circumferential positions around the center of the stator core, the stator core is projected radially outward to form a contact portion.
  • the stator core contact portion contacts the inner peripheral surface of the housing.
  • a fastening member that penetrates the stator core and fastens the stator core to the housing is a neck-long bolt, and is disposed so as to be included in a circumferential position of the stator core contact portion.
  • the stator core contact portion directly contacts the inner peripheral surface of the housing, thereby suppressing the eccentricity between the rotor of the motor and the stator. As a result, the noise and vibration of the motor are suppressed.
  • the noise and vibration of the motor are based on various causes other than the eccentricity of the rotor and the stator as described above.
  • the slight vibration of the stator itself may be transmitted to other parts of the motor, causing unpleasant noise from the parts.
  • the present inventor has noticed that when the motor is driven, the circular cover covering the end surface in the axial direction of the motor vibrates and becomes a noise source.
  • the stator core protrudes to the outer diameter side and comes into contact with the housing near the head of the fastening member (bolt), that is, in the vicinity of the circular cover.
  • a circular cover is attached and fixed in the vicinity of the contact portion. For this reason, if the stator itself vibrates slightly, the fine vibration is transmitted to the circular cover without being attenuated and vibrates the circular cover, and the circular cover becomes an unpleasant noise source.
  • an object of the present invention is to provide a technique for preventing a cover that covers an end surface of a stator from becoming a noise source in a motor driving device that drives a wheel.
  • a vehicle motor drive device includes a motor unit for driving wheels, and the motor unit faces a motor rotation shaft, a rotor coupled to the motor rotation shaft, and the rotor through a gap.
  • Fixing means for fixing the stator to the casing base, and the motor casing and the casing cover each have an abutting surface that abuts each other in the axial direction, and the abutting surface of the motor casing is an outer peripheral surface of the stator.
  • the motor casing is separated from the fixing means.
  • the motor casing is also separated from the portion of the stator connected to the fixing means.
  • the abutting surfaces of the motor casing and the motor casing cover are separated from both the fixing means and the portion of the stator connected to the fixing means. Therefore, even if the stator itself slightly vibrates when the motor unit drives the wheel, the motor casing cover that is abutted against the motor casing at the abutting surface is hardly vibrated. Therefore, according to the present invention, unpleasant noise can be suppressed by reducing the membrane vibration of the motor casing cover covering the end face of the stator.
  • a motor casing includes a coil terminal extending from a coil provided in a stator, an end of a power line drawn from the outside of the vehicle motor drive device, and a lead extending from a sensor provided in the vehicle motor drive device. It includes a box-shaped terminal box that houses at least one of the terminal and the end of the signal line drawn from the outside of the vehicle motor drive device, and the bulging portion of the abutting surface forms the outline of the terminal box. According to this aspect, since the bulging portion also serves as the terminal box, the space between the bulging portion and the stator can be effectively used as the internal space of the terminal box. As another aspect, a mere gap may be provided between the bulging portion and the stator.
  • the fixing means is a bolt extending in parallel with the motor rotation shaft and penetrating the stator, and the shaft tip end of the bolt is screwed into a female screw hole provided in the casing base, and the head of the bolt is fixed.
  • the portion contacts the stator.
  • the stator is securely fixed so as not to be displaced in the axial direction by bolt fastening.
  • the length of the bolt is not particularly limited. As an example, the bolt is longer than the stator and penetrates from the other axial end of the stator to the one axial end.
  • the bolt is shorter than the stator, and a flange portion or a protrusion protruding outward is provided at one end in the axial direction of the stator, and a through hole is provided in the flange portion or protrusion.
  • the bolt may be fastened with a bolt.
  • the stator has a protrusion protruding from the outer peripheral surface of the stator
  • the fixing means fixes the protrusion of the stator to the casing base
  • the motor casing protrudes outward from the stator protrusion.
  • the structure for attaching the stator to the casing of the vehicle motor drive device is realized by the protrusion provided on the stator. Further, since the protruding portion of the motor casing protrudes so as to avoid the protrusion of the stator, the inner peripheral surface of the motor casing and the outer peripheral surface of the stator are separated from each other, and the vibration of the stator is hardly transmitted to the motor casing cover.
  • the protrusion may be provided at one end in the axial direction of the stator like a flange, or may extend from one end to the other end in the axial direction of the stator like a ridge.
  • the protrusions may be provided at predetermined circumferential positions of the stator so as to correspond to the circumferential arrangement of the fixing means.
  • a cylindrical or polygonal stator may be attached to the casing base without providing a protrusion on the stator.
  • the vehicle motor drive device of the present invention is provided at any position of the electric vehicle.
  • a wheel hub bearing portion that rotatably supports a hub wheel connected to the wheel is further provided, and is disposed in an inner space region of the wheel.
  • the vehicle motor drive device may be an on-board motor drive device mounted on a vehicle body. The on-board motor drive device is connected to the wheel via a constant velocity joint and a drive shaft.
  • the motor casing cover that is provided at the end of the motor and covers the end surface of the stator inside the motor can reduce film vibration, and the motor casing Generation of unpleasant noise from the cover can be suppressed.
  • FIG. 1 It is a schematic diagram which shows the inside of the in-wheel motor drive device which becomes one Embodiment of this invention. It is an expanded sectional view showing the embodiment. It is a longitudinal cross-sectional view which shows typically the motor part of the embodiment.
  • FIG. 1 is a schematic view showing the inside of an in-wheel motor drive device according to an embodiment of the present invention, and shows the position of a stator or the like by removing a motor casing cover.
  • components such as the rotor are omitted in FIG.
  • the right side of the drawing represents the front of the vehicle
  • the left side of the drawing represents the rear of the vehicle
  • the upper side of the drawing represents the upper side of the vehicle
  • the lower side of the drawing represents the lower side of the vehicle.
  • the vehicle width direction outer side (outboard side) is viewed from the vehicle width direction inner side (inboard side).
  • FIG. 2 is a developed cross-sectional view showing the embodiment, and the cross section shown in FIG. 2 includes a plane including the axis M and the axis N and a plane including the axis N and the axis O shown in FIG. It is the expansion
  • the left side of the drawing represents the vehicle width direction outside (outboard side), and the right side of the drawing represents the vehicle width direction inside (inboard side).
  • the in-wheel motor drive device 10 includes a wheel hub bearing portion 11 provided at the center of a wheel (not shown), a motor portion 21 that drives the wheel, and a wheel hub bearing that decelerates the rotation of the motor portion. And a speed reduction part 31 that transmits to the part 11.
  • the motor unit 21 and the speed reduction unit 31 are arranged offset from the axis O of the wheel hub bearing unit 11.
  • the axis O extends in the vehicle width direction and coincides with the axle.
  • the wheel hub bearing portion 11 is disposed on one side (outboard side) in the axial direction of the in-wheel motor driving device 10, and the motor portion 21 is on the other side (inboard side) in the axial direction of the in-wheel motor driving device 10.
  • the speed reduction part 31 is arranged in one axial direction than the motor part 21, and the axial direction position of the speed reduction part 31 overlaps with the axial direction position of the wheel hub bearing part.
  • the in-wheel motor drive device 10 is a vehicle motor drive device that drives wheels of an electric vehicle.
  • the in-wheel motor drive device 10 is connected to a vehicle body (not shown).
  • the in-wheel motor drive device 10 can drive an electric vehicle at a speed of 0 to 180 km / h.
  • the wheel hub bearing 11 is a rotating inner ring / fixed outer ring, and is arranged coaxially on the outer diameter side of the inner ring 12 and the inner ring 12 as a rotating wheel (hub wheel) coupled to a wheel wheel (not shown).
  • An outer ring 13 as a fixed ring, and a plurality of rolling elements 14 disposed in an annular space between the inner ring 12 and the outer ring 13.
  • the center of rotation of the inner ring 12 coincides with an axis O passing through the center of the wheel hub bearing portion 11.
  • a plurality of outer ring protrusions 13 f are provided on the outer circumferential surface of the outer ring 13 at different positions in the circumferential direction.
  • a through hole is formed in each outer ring protrusion 13f protruding in the outer diameter direction.
  • Each through-hole extends in parallel with the axis O, and the bolt 15 is passed from one side in the axis O direction.
  • a shaft portion of each bolt 15 is screwed into a female screw hole formed in the carrier member 61. As a result, the outer ring 13 is connected and fixed to the carrier member 61.
  • the front portion 38f of the main body casing 38 is disposed adjacent to the other side of the carrier member 61 in the axis O direction.
  • the carrier member 61 is further provided with a plurality of female screw holes.
  • the front portion 38f of the main body casing 38 is provided with a plurality of through holes at different positions in the circumferential direction, and these through holes are connected to the female screw holes of the carrier member.
  • the female screw hole of the carrier member 61 and the through hole of the outer ring protrusion 13f extend in parallel to the axis O, and a bolt 62 is passed from the other side in the axis O direction. A shaft portion of each bolt 62 is screwed into a female screw hole formed in the carrier member 61. As a result, the main body casing 38 is connected and fixed to the carrier member 61.
  • the main body casing 38 refers to a casing that forms the outline of the speed reduction unit 31.
  • the front portion 38 f is a casing wall portion that covers one end of the speed reduction portion 31 in the axis O direction of the main body casing 38.
  • the outer ring 13 passes through the front portion 38f.
  • the inner ring 12 is a cylindrical body longer than the outer ring 13 and is passed through the center hole of the outer ring 13.
  • a coupling portion 12f is formed at one end portion in the axis O direction of the inner ring 12 protruding from the outer ring 13 to the outside of the in-wheel motor drive device 10.
  • the coupling portion 12f is a flange and constitutes a coupling portion for coupling coaxially with a brake rotor and wheels (not shown).
  • the inner ring 12 is coupled to the road wheel of the wheel at the coupling portion 12f and rotates integrally with the wheel.
  • a plurality of rows of rolling elements 14 are arranged.
  • the outer peripheral surface of the central portion of the inner ring 12 in the direction of the axis O constitutes the inner raceway surface of the plurality of rolling elements 14 arranged in the first row.
  • An inner race 12r is fitted to the outer periphery of the other end of the inner ring 12 in the axis O direction.
  • the outer peripheral surface of the inner race 12r constitutes the inner race of the plurality of rolling elements 14 arranged in the second row.
  • the inner peripheral surface at one end of the outer ring 13 in the direction of the axis O constitutes the outer raceway surface of the rolling elements 14 in the first row.
  • An inner peripheral surface of the other end portion of the outer ring 13 in the axis O direction forms an outer raceway surface of the rolling elements 14 in the second row.
  • a sealing material 16 is further interposed in the annular space between the inner ring 12 and the outer ring 13. The sealing material 16 seals both ends of the annular space to prevent intrusion of dust and foreign matter.
  • the output shaft 37 of the speed reduction unit 31 is inserted into the center hole at the other end in the axis O direction of the inner ring 12 and is spline-fitted.
  • the motor unit 21 includes a motor rotating shaft 22, a rotor 23, a stator 24, and a motor casing 25, and is sequentially arranged from the axis M of the motor unit 21 to the outer diameter side in this order.
  • the motor unit 21 is an inner rotor / outer stator type radial gap motor, but may be of other types.
  • the motor unit 21 may be an axial gap motor.
  • the motor casing 25 surrounds the outer periphery of the stator 24.
  • One end of the motor casing 25 in the direction of the axis M is coupled to the back surface portion 38 b of the main body casing 38.
  • the other end of the motor casing 25 in the axis M direction is sealed with a plate-like motor casing cover 25v.
  • the back surface portion 38 f is a casing wall portion that covers the other end of the speed reduction portion 31 in the axis M direction (axis O direction) of the main body casing 38.
  • the main body casing 38 and the motor casing 25 constitute a casing that forms an outline of the in-wheel motor drive device 10.
  • a part of the main body casing 38 and the motor casing 25 is also simply referred to as a casing.
  • the stator 24 includes a cylindrical stator core 24b and a coil 24c wound around the stator core 24b.
  • the stator core 24b is formed by laminating ring-shaped steel plates in the axis M direction.
  • Both end portions of the motor rotating shaft 22 are rotatably supported by the back portion 38b of the main body casing 38 and the motor casing cover 25v of the motor portion 21 via the rolling bearings 27 and 28.
  • a rotation angle sensor 52 is provided at the other end of the motor rotation shaft 22 in the axis M direction.
  • the rotation angle sensor 52 is disposed on the inner side in the axis M direction with respect to the rolling bearing 28, and is attached to the central portion of the motor casing cover 25v.
  • the axis M that is the rotation center of the motor rotation shaft 22 and the rotor 23 extends in parallel with the axis O of the wheel hub bearing portion 11. That is, the motor unit 21 is disposed offset from the axis O of the wheel hub bearing unit 11.
  • the axis M of the motor unit is offset from the axis O in the vehicle front-rear direction, and specifically, is arranged in front of the vehicle with respect to the axis O.
  • the motor casing 25 has a substantially cylindrical shape and has a shape in which a predetermined circumferential position protrudes toward the outer diameter side.
  • the motor casing 25 of the present embodiment includes a box-shaped power line terminal box 26b protruding upward, a box-shaped signal line terminal box 26c protruding rearward of the vehicle, and a semi-cylindrical protrusion 26d protruding forward of the vehicle.
  • the power line terminal box 26b is disposed above the axis M.
  • the signal line terminal box 26c is disposed below the axis M and behind the vehicle.
  • the protrusion 26d is disposed below the axis M and in front of the vehicle.
  • the portion between the three protruding portions separated in the circumferential direction in the motor casing 25 constitutes cylindrical portions 29, 29, and 29.
  • the inner wall surfaces of the cylindrical portions 29, 29, 29 are cylindrical surfaces with the axis M as the center.
  • the power line terminal box 26b accommodates three coil terminals 41 drawn from the end portion (coil end) of the stator 24 in the axis M direction. Further, three power lines (not shown) extending from the outside of the in-wheel motor drive device 10 are drawn into the power line terminal box 26b, and the end portions of the power lines are connected to the coil terminals via a connector structure (not shown). 41.
  • the signal line terminal box 26c has an end of a lead wire (not shown) extending from a plurality of sensors such as a rotation angle sensor 52, a temperature sensor (not shown), and other sensors installed in the in-wheel motor drive device 10. ) Is aggregated. Further, a signal line (not shown) extending from the outside of the in-wheel motor drive device 10 is drawn into the signal line terminal box 26c, and the end of the signal line is connected to the end of the conducting wire through a connector structure not shown.
  • FIG. 1 shows the end face of the stator 24 that appears when the motor casing cover 25v is removed from the motor casing 25.
  • FIG. 1 shows the end face of the stator 24 that appears when the motor casing cover 25v is removed from the motor casing 25.
  • FIG. 1 shows the end face of the stator 24 that appears when the motor casing cover 25v is removed from the motor casing 25.
  • FIG. 1 shows the end face of the stator 24 by hatching in FIG. 1 and a part of the structure for fixing the rotor, the motor rotation shaft, and the stator 24 to the back portion 38b is omitted.
  • the inner peripheral surfaces of the cylindrical portions 29, 29, 29 are in contact with the outer peripheral surface of the stator 24.
  • the three cylindrical portions 29, 29, 29 that are spaced apart in the circumferential direction in this way support the outer peripheral surface of the stator 24 from the outer diameter side, so that the stator 24 is positioned to be coaxial with the axis M. .
  • the fitting between the stator 24 and the motor casing 25 may be press-fitting.
  • a groove-shaped notch 25 g is formed on the inner wall surface of the motor casing 25 adjacent to the cylindrical portion 29.
  • a groove-shaped notch 24g is similarly formed on the outer peripheral surface of the stator 24.
  • Each of the notches 24g and 25g extends in parallel with the axis M and has an arc cross section. Further, the notches 24g and 25g have the same circumferential position, and a round bar-shaped detent pin 30 is inserted between the notches 24g and 25g.
  • the detent pins 30 are installed at a plurality of locations in the circumferential direction.
  • a protrusion 24d is formed on the outer peripheral surface of the stator 24 so as to protrude to the outer diameter side.
  • the protrusion 24d is a part of the stator core 24b (FIG. 2), and extends from one end of the stator 24 in the axis M direction to the other end.
  • the protrusions 24d are provided at a plurality of locations at intervals in the circumferential direction.
  • Each protrusion 24d is formed with a through hole 24h extending in parallel with the axis M. The through hole 24h is passed through fixing means described later, whereby the stator 24 is attached and fixed to the casing of the in-wheel motor drive device.
  • Each protrusion 24d is accommodated in the power line terminal box 26b, the signal line terminal box 26c, and the protrusion 26d, respectively.
  • a gap G is interposed between the inner wall surface of the protrusion 26d and the protrusion 24d.
  • the protrusion 24d is separated from the inner wall surface of these terminal boxes.
  • the protrusion 24d, in particular, one end of the protrusion 24d in the axis M direction corresponds to a portion of the stator 24 that is attached and fixed to the back surface portion 38b.
  • a plurality of through holes 24h are provided at intervals in the circumferential direction. Specifically, the through holes 24h are disposed above and below the axis M, respectively. Furthermore, through holes 24 h are respectively arranged below the axis M and at the front and rear of the vehicle. Or as a modification which is not illustrated, through-hole 24h may be arranged in the vehicle front and back of the vehicle above axis M, respectively. The same applies to the protrusion 24d. In the present embodiment, three protrusions 24d and through holes 24h are arranged at equal intervals in the circumferential direction.
  • the carrier member 61 extends upward and downward from the box-shaped signal line terminal box 26c, and has a plurality of through holes 63 in the expanded portion.
  • a coupling tool such as a bolt 62 (FIG. 2) through the through-hole 63
  • the carrier member 61 is coupled to a suspension device (not shown).
  • the in-wheel motor drive device 10 is connected to the vehicle body of the electric vehicle via the suspension device, and can be bound and rebound in the vertical direction by the action of the suspension device. Further, the in-wheel motor drive device 10 can be steered in the left-right direction by the action of the suspension device.
  • the speed reduction unit 31 includes an input shaft 32 s that is coaxially coupled to the motor rotation shaft 22 of the motor unit 21, an input gear 32 that is provided coaxially on the outer peripheral surface of the input shaft 32 s, and a plurality of intermediate gears 33. , 35, an intermediate shaft 34 coupled to the center of these intermediate gears 33, 35, an output shaft 37 coupled coaxially with the inner ring 12 of the wheel hub bearing 11, and an output provided coaxially on the outer peripheral surface of the output shaft 37.
  • a gear 36 and a main body casing 38 that accommodates the plurality of gears and the rotation shaft are provided.
  • the main body casing 38 is also referred to as a speed reduction part casing because it forms an outline of the speed reduction part 31.
  • the input gear 32 is a helical gear with external teeth.
  • the input shaft 32s has a hollow structure, and one end in the axial direction of the motor rotating shaft 22 is inserted into the hollow hole of the input shaft 32s, and is spline-fitted (including serrations, the same applies hereinafter) so as not to be relatively rotatable.
  • the input shaft 32s is rotatably supported by the front portion 38f and the rear portion 38b of the main body casing 38 via rolling bearings 32m and 32n on both ends of the input gear 32.
  • the axis N that is the center of rotation of the intermediate shaft 34 of the speed reduction portion 31 extends parallel to the axis O. Both ends of the intermediate shaft 34 are rotatably supported by the front portion 38f and the back portion 38b of the main body casing 38 via bearings 34m and 34n.
  • a first intermediate gear 33 and a second intermediate gear 35 are provided coaxially with the axis N of the intermediate shaft 34 at the center of the intermediate shaft 34.
  • the first intermediate gear 33 and the second intermediate gear 35 are external helical gears, and the diameter of the first intermediate gear 33 is larger than the diameter of the second intermediate gear 35.
  • the large-diameter first intermediate gear 33 is disposed on the other side in the axis N direction with respect to the second intermediate gear 35 and meshes with the small-diameter input gear 32.
  • the small-diameter second intermediate gear 35 is disposed on one side in the axis N direction from the first intermediate gear 33 and meshes with the large-diameter output gear 36.
  • the axis N of the intermediate shaft 34 is disposed above the axis O and the axis M as shown in FIG. Further, the axis N of the intermediate shaft 34 is disposed in front of the vehicle with respect to the axis O and behind the vehicle with respect to the axis M.
  • the speed reduction unit 31 is a three-axis parallel shaft gear reducer having axes O, N, and M that are arranged at intervals in the vehicle front-rear direction and extend parallel to each other.
  • the output gear 36 is an external helical gear and is provided coaxially in the center of the output shaft 37.
  • the output shaft 37 extends along the axis O.
  • One end of the output shaft 37 in the direction of the axis O is inserted into the center hole of the inner ring 12 and is fitted so as not to be relatively rotatable.
  • Such fitting is spline fitting or serration fitting.
  • the other end of the output shaft 37 in the direction of the axis O is rotatably supported by the back surface portion 38b of the main body casing 38 via a rolling bearing 37n.
  • An annular convex portion 36c is formed on one end surface of the output gear 36 in the axis O direction.
  • the annular convex portion 36c is a wall extending in the circumferential direction about the axis O.
  • An annular step 38g is formed in the front portion 38f of the main body casing 38 on the outer diameter side of the annular protrusion 36c.
  • the annular step 38g surrounds the entire circumference of the annular protrusion 34c.
  • a rolling bearing 37m is provided between the annular protrusion 36c on the inner diameter side and the annular step 38g on the outer diameter side.
  • the reduction gear 31 rotates the input shaft 32s by meshing the small-diameter drive gear and the large-diameter driven gear, that is, meshing the input gear 32 and the first intermediate gear 33, and meshing the second intermediate gear 35 and the output gear 36. Is decelerated and transmitted to the output shaft 37.
  • the rotating elements from the input shaft 32 s to the output shaft 37 of the speed reduction unit 31 constitute a drive transmission path that transmits the rotation of the motor unit 21 to the inner ring 12.
  • the main body casing 38 includes a cylindrical part, and plate-like front part 38f and back part 38b covering both ends of the cylindrical part.
  • the cylindrical portion covers the internal parts of the speed reducing portion 31 so as to surround the axes O, N, and M extending in parallel with each other.
  • the plate-shaped front portion 38f covers the internal parts of the speed reducing portion 31 from one side in the axial direction.
  • the plate-like back surface portion 38b covers the internal parts of the speed reducing portion 31 from the other side in the axial direction.
  • the back surface portion 38 b of the main body casing 38 is a partition wall that is coupled to the motor casing 25 and partitions the internal space of the speed reduction portion 31 and the internal space of the motor portion 21.
  • the motor casing 25 is supported by the main body casing 38 and protrudes from the main body casing 38 to the other side in the axial direction.
  • the main body casing 38 defines an internal space of the speed reducing portion 31 and accommodates all the rotating elements (rotating shafts and gears) of the speed reducing portion 31 in the internal space.
  • the lower part of the main body casing 38 is an oil storage part 39.
  • the oil reservoir 39 is disposed at a lower position than the motor unit 21. Lubricating oil that lubricates the motor unit 21 and the speed reduction unit 31 is stored in the oil storage unit 39 that occupies the lower part of the internal space of the main body casing 38.
  • the input shaft 32s, the intermediate shaft 34, and the output shaft 37 are supported at both ends by the above-described rolling bearings.
  • These rolling bearings 32m, 34m, 37m, 32n, 34n, and 37n are radial bearings.
  • the one end surface of the annular convex portion 36c, the output shaft 37, and the output gear 36 in the axis O direction forms an annular concave portion that is recessed in the axis O direction.
  • the annular recess accommodates the other end of the inner ring 12 in the axis O direction and the other end of the inner race 12r in the axis O direction.
  • the rotor 23 of the motor unit 21 rotates and outputs rotation from the motor rotation shaft 22 to the speed reduction unit 31.
  • the speed reduction part 31 decelerates the rotation input to the input shaft 32 s from the motor part 21 and outputs it from the output shaft 37 to the wheel hub bearing part 11.
  • the inner ring 12 of the wheel hub bearing portion 11 rotates at the same rotational speed as the output shaft 37 and drives a wheel (not shown) attached and fixed to the inner ring 12.
  • FIG. 3 is a longitudinal sectional view schematically showing a state in which the motor section is cut along a plane indicated by III-III in FIG. 1 and this section is viewed in the direction of the arrow, and is different from the section of the motor section shown in FIG. Represents a cross section.
  • the motor casing cover 25v covering the other end of the stator 24 is represented by a two-dot chain line.
  • the abutting surface 25d of the motor casing cover 25v and the abutting surface 25d of the motor casing 25 that are abutted against each other are flat surfaces. These abutting surfaces 25d are disposed at the other end of the motor unit 21 in the axis M direction.
  • the position of the abutting surface 25d in the axis M direction overlaps the position of the stator 24 in the axis M direction, but the abutting surface 25d may be disposed on the other side in the axis M direction than the stator 24.
  • the motor casing cover 25v is fixed to the motor casing 25 by fixing means such as a bolt (not shown).
  • the motor casing cover 25v is separated from the stator 24 on the other side in the axis M direction.
  • a casing base 38c is provided at one end of the stator 24 in the axis M direction.
  • the casing base 38c is provided on the other wall surface in the axis M direction of the back surface portion 38b, and protrudes from the other wall surface on the inner diameter side to the other in the axis M direction from the casing base 38c.
  • the protruding end of the casing base 38 c is a flat surface perpendicular to the axis M.
  • a female screw hole 38d is formed at the protruding end of the casing base 38c.
  • the female screw hole 38d is directed to the other side in the axis M direction.
  • the casing base 38c is disposed at the same circumferential position as the power line terminal box 26b.
  • the other casing base 38c is disposed at the same circumferential position as the signal line terminal box 26c (FIG. 1) and the protruding portion 26d (FIG. 1).
  • the casing bases 38c of the present embodiment are arranged at equal intervals in the circumferential direction at 120 °.
  • the casing base 38 c is formed integrally with one end of the motor casing 25 in the axis M direction.
  • the back surface portion 38b has a central hole 38e through which the motor rotating shaft 22 passes, and a rolling bearing 27 is provided coaxially adjacent to the central hole 38e.
  • a bolt 51 as a fixing means is passed through the through hole 24h of the stator 24 from the other side in the axis M direction.
  • the front end of the bolt 51 is screwed into the female screw hole 38d of the casing base 38c and the head of the bolt 51 is tightened, the head of the bolt 51 comes into contact with the other end in the axis M direction of the protrusion 24d. Is pressed against the casing base 38c.
  • the stator 24 is fixedly attached so as not to move in the direction of the axis M.
  • a part of the motor casing 25 is a double wall.
  • the lower portion of the motor casing 25 has a cylindrical portion 29 as an inner wall and an inclined wall 25n whose one side in the axis M direction is lower and the other in the axis M direction is higher as an outer wall.
  • the power line terminal box 26b is formed from one end to the other end in the axis M direction of the motor casing 25 and is adjacent to the casing base 38c. Although not shown, the signal line terminal box 26c and the protruding portion 26d are the same. For this reason, the protrusion 24d is separated from the power line terminal box 26b in the entire length of the protrusion 24d as shown in FIG. Similarly, the signal line terminal box 26c and the protruding portion 26d are separated from the protrusion 24d.
  • the abutting surface 25 d extends in a band shape and surrounds the stator 24.
  • the abutting surface 25 d includes a proximity portion 25 g that extends in an arc shape along the outer peripheral surface of the stator 24.
  • the abutting surface 25d forms the contour of the power line terminal box 26b, the contour of the signal line terminal box 26c, and the contour of the protruding portion 26d.
  • the contour portion of the abutting surface 25d becomes a bulging portion 25f that protrudes toward the outer diameter side so as to be away from the outer peripheral surface of the stator 24.
  • the circumferential position where the through hole 24h is disposed is disposed so as to overlap the circumferential position of the protruding portion 26d.
  • the circumferential position where the through hole 24h is arranged is arranged so as to overlap the circumferential position of the power line terminal box 26b.
  • the circumferential position where the through hole 24h is disposed is disposed so as to overlap the circumferential position of the signal line terminal box 26c. That is, the circumferential positions of the bolts 51 (FIG. 3) as the stator fixing means that are passed through the respective through holes 24h are arranged so as to overlap the circumferential positions of the bulging portions 25f.
  • the in-wheel motor drive device 10 of this embodiment is provided with the motor part 21 which drives a wheel.
  • the motor unit 21 includes a motor rotating shaft 22, a rotor 23 coupled to the motor rotating shaft 22, a cylindrical stator 24 facing the rotor 23 via a gap, a motor casing 25 surrounding the outer periphery of the stator 24, A casing base 38c that supports one end of the stator 24 in the axis M direction, a motor casing cover 25v that covers the other end of the stator 24 in the axis M direction, and a stator 24 that is disposed at a predetermined circumferential position around the motor rotation shaft 22. And a bolt 51 (fixing means) for fixing to the casing base 38c.
  • the motor casing 25 and the motor casing cover 25v each have an abutting surface 25d that abuts each other in the direction of the axis M.
  • the abutting surface 25 d of the motor casing 25 has a shape surrounding the outer peripheral surface of the stator 24, and is separated from the adjacent portion 25 g extending along the outer peripheral surface of the stator 24 and the outer peripheral surface of the stator 24. And a bulging portion 25f protruding to the outer diameter side. And the predetermined circumferential direction position where the volt
  • the motor casing 25 is separated from the bolt 51. Further, the motor casing 25 is also separated from the protrusion 24 d connected to the bolt 51 in the stator 24. Therefore, even if the stator 24 itself vibrates slightly when the motor unit 21 drives the wheel, the vibration is mainly transmitted to the casing base 38c via the bolt 51, so that the vibration transmitted to the motor casing 25 can be reduced. . Therefore, the motor casing cover 25v that abuts the motor casing 25 at the abutting surface 25d is hardly vibrated. According to the present invention, unpleasant noise can be suppressed by reducing the membrane vibration of the motor casing cover 25v covering the other end surface of the stator 24 in the axis M direction.
  • the motor casing 25 of the present embodiment is provided in a box-shaped power line terminal box 26 b that houses the end of the power line extending from the coil 24 c provided in the stator 24 and the coil terminal 41, and the vehicle motor drive device.
  • a signal line terminal box 26c extending from the sensor is included.
  • the bulging portion 25f of the abutting surface 25d forms the outline of these terminal boxes. According to this embodiment, since the bulging portion 25f also serves as a terminal box, the space between the bulging portion 25f and the stator 24 can be effectively used as a terminal box.
  • the fixing means for fixing the stator 24 to the casing base 38c is a bolt 51 that extends parallel to the motor rotation shaft 22 and penetrates the stator 24, and the shaft 51 tip of the bolt 51 is provided on the casing base 38c.
  • the bolt 51 is screwed into the female screw hole 38d, and the head of the bolt 51 comes into contact with the other end of the stator 24 in the axis M direction. Thereby, the stator 24 is firmly fixed so as not to be displaced in the direction of the axis M by fastening the bolt.
  • stator 24 of this embodiment has a protrusion 24d protruding from the outer peripheral surface of the stator 24, and a bolt 51 serving as a means for fixing the stator 24 fixes the protrusion 24d to the casing base 38c.
  • the motor casing 25 has a protruding portion 26d that protrudes toward the outer diameter side away from the protrusion 24d.
  • the protrusion 24d provides a structure for attaching the stator 24 to the casing of the in-wheel motor drive device 10.
  • the vehicle motor drive device according to the present invention is advantageously used in electric vehicles and hybrid vehicles.

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Abstract

A motor drive device (10) for a vehicle has a cylindrical stator (24), a motor casing (25) which surrounds the outer periphery of the stator (24), a casing base section which supports one end of the stator (24), a motor casing cover which covers the other end of the stator (24), and an affixation means (51) which is disposed at a predetermined circumferential position about an axis M and which affixes the stator (24) to the casing base section. The motor casing (25) and the motor casing cover respectively have abutting surfaces (24d) which are made to abut against each other in the direction of the axis M. The abutting surface (25d) of the motor casing (25) is shaped to surround the outer peripheral surface of the stator (24) and includes: a proximity portion (25g) extending along the outer peripheral surface of the stator (24); and a bulged portion (25f) protruding to the outer diameter side so as to separate from the outer peripheral surface of the stator (24). The circumferential position where the affixation means (51) is disposed overlaps the circumferential position of the bulged portion (25f).

Description

車両用モータ駆動装置Vehicle motor drive device
　本発明は、車輪を駆動するモータ駆動装置に関し、モータ部のステータをモータ部のケーシングに固定する構造に関する。 The present invention relates to a motor driving device for driving wheels, and to a structure for fixing a stator of a motor unit to a casing of the motor unit.
　特許文献１のように、車輪を駆動するモータが知られている。特許文献１はハウジングに収納されるステータに関し、ステータコアの中心回りに３点の周方向位置で、ステータコアを径方向外方に突出させて当接部とする。かかるステータコア当接部は、ハウジングの内周面に当接する。ステータコアを貫通して当該ステータコアをハウジングに締結する締結部材は首長のボルトであり、かかるステータコア当接部の周方向位置に含まれるよう配置される。 As in Patent Document 1, a motor that drives a wheel is known. Patent Document 1 relates to a stator housed in a housing, and at three circumferential positions around the center of the stator core, the stator core is projected radially outward to form a contact portion. The stator core contact portion contacts the inner peripheral surface of the housing. A fastening member that penetrates the stator core and fastens the stator core to the housing is a neck-long bolt, and is disposed so as to be included in a circumferential position of the stator core contact portion.
　特許文献１の記載によれば、ステータコア当接部がハウジング内周面に直接当接することで、モータのロータとステータとの偏芯を抑制するという。ひいてはモータの騒音、振動が抑制されるという。 According to the description in Patent Literature 1, the stator core contact portion directly contacts the inner peripheral surface of the housing, thereby suppressing the eccentricity between the rotor of the motor and the stator. As a result, the noise and vibration of the motor are suppressed.
特許第４８１１１１４号公報Japanese Patent No. 4811114
　ところでモータ（回転電機）の騒音、振動は、上記のようなロータとステータの偏芯の他、多種多様な原因に基づく。換言するとロータおよびステータが同軸に保持されていても、ステータ自身の微振動がモータの他の部品に伝達して、該部品から不快な騒音を起こす場合がある。 By the way, the noise and vibration of the motor (rotary electric machine) are based on various causes other than the eccentricity of the rotor and the stator as described above. In other words, even if the rotor and the stator are held coaxially, the slight vibration of the stator itself may be transmitted to other parts of the motor, causing unpleasant noise from the parts.
　本発明者は、モータ駆動時に、モータの軸線方向端面を覆う円形カバーが膜振動して騒音源となることに気付いた。 The present inventor has noticed that when the motor is driven, the circular cover covering the end surface in the axial direction of the motor vibrates and becomes a noise source.
　特許文献１記載のモータによれば、締結部材（ボルト）の頭部に近い箇所、つまり円形カバーの近傍で、ステータコアが外径側に突出してハウジングに当接する。かかる当接箇所の近傍に円形カバーが取付固定される。このため、ステータ自身が微振動すると、微振動が減衰されずに円形カバーに伝達して円形カバーを加振してしまい、円形カバーが不快な騒音源になってしまう。 According to the motor described in Patent Document 1, the stator core protrudes to the outer diameter side and comes into contact with the housing near the head of the fastening member (bolt), that is, in the vicinity of the circular cover. A circular cover is attached and fixed in the vicinity of the contact portion. For this reason, if the stator itself vibrates slightly, the fine vibration is transmitted to the circular cover without being attenuated and vibrates the circular cover, and the circular cover becomes an unpleasant noise source.
　本発明は、上述の実情に鑑み、車輪を駆動するモータ駆動装置において、ステータの端面を覆うカバーが騒音源とならないようにする技術を提供することを目的とする。 In view of the above circumstances, an object of the present invention is to provide a technique for preventing a cover that covers an end surface of a stator from becoming a noise source in a motor driving device that drives a wheel.
　この目的のため本発明による車両用モータ駆動装置は、車輪を駆動するモータ部を備え、かかるモータ部は、モータ回転軸と、モータ回転軸と結合するロータと、ロータと隙間を介して対面する筒状のステータと、ステータの外周を包囲するモータケーシングと、ステータの一方端を支持するケーシング基部と、ステータの他方端を覆うモータケーシングカバーと、モータ回転軸回りにおける所定の周方向位置に配置されてステータをケーシング基部に固定する固定手段とを有し、これらのモータケーシングおよびケーシングカバーは、軸線方向に互いに突き合わされる突合面をそれぞれ有し、モータケーシングの突合面は、ステータの外周面を囲繞する形状であって、ステータの外周面に沿って延びる近接部分と、ステータの外周面から離れるように外径側へ突出する膨らみ部分とを含み、固定手段が配置される所定の周方向位置は、膨らみ部分の周方向位置と重なる。 For this purpose, a vehicle motor drive device according to the present invention includes a motor unit for driving wheels, and the motor unit faces a motor rotation shaft, a rotor coupled to the motor rotation shaft, and the rotor through a gap. A cylindrical stator, a motor casing that surrounds the outer periphery of the stator, a casing base that supports one end of the stator, a motor casing cover that covers the other end of the stator, and a predetermined circumferential position around the motor rotation axis Fixing means for fixing the stator to the casing base, and the motor casing and the casing cover each have an abutting surface that abuts each other in the axial direction, and the abutting surface of the motor casing is an outer peripheral surface of the stator. The adjacent portion extending along the outer peripheral surface of the stator and the outer peripheral surface of the stator And a bulge portion protruding radially outwardly as a predetermined circumferential position of the fixing means is arranged overlaps with the circumferential position of the bulge.
　かかる本発明によれば、モータケーシングが固定手段から離隔される。またモータケーシングが、ステータのうち固定手段と連結する部位からも離隔される。特にモータケーシングとモータケーシングカバーの突合面が、固定手段からも、ステータのうち固定手段と連結する部位からも離隔される。したがってモータ部が車輪を駆動する際にステータ自身が微振動しても、突合面でモータケーシングに突き合わされるモータケーシングカバーは殆ど加振されない。したがって本願発明によれば、ステータの端面を覆うモータケーシングカバーの膜振動を低減して不快な騒音を抑制することができる。 According to the present invention, the motor casing is separated from the fixing means. The motor casing is also separated from the portion of the stator connected to the fixing means. In particular, the abutting surfaces of the motor casing and the motor casing cover are separated from both the fixing means and the portion of the stator connected to the fixing means. Therefore, even if the stator itself slightly vibrates when the motor unit drives the wheel, the motor casing cover that is abutted against the motor casing at the abutting surface is hardly vibrated. Therefore, according to the present invention, unpleasant noise can be suppressed by reducing the membrane vibration of the motor casing cover covering the end face of the stator.
　本発明の一局面としてモータケーシングは、ステータに設けられるコイルから延びるコイル端子、車両用モータ駆動装置の外部から引き込まれる動力線の端部、車両用モータ駆動装置内部に設けられるセンサから延びる導線の端子、および車両用モータ駆動装置の外部から引き込まれる信号線の端部、のうち少なくとも１を収納する箱状の端子ボックスを含み、突合面の膨らみ部分は、端子ボックスの輪郭をなす。かかる局面によれば、膨らみ部分が端子ボックスを兼用することから、膨らみ部分とステータとの間の空間を端子ボックスの内部空間として有効利用することができる。他の局面として、膨らみ部分とステータとの間は、単なる隙間であってもよい。 As one aspect of the present invention, a motor casing includes a coil terminal extending from a coil provided in a stator, an end of a power line drawn from the outside of the vehicle motor drive device, and a lead extending from a sensor provided in the vehicle motor drive device. It includes a box-shaped terminal box that houses at least one of the terminal and the end of the signal line drawn from the outside of the vehicle motor drive device, and the bulging portion of the abutting surface forms the outline of the terminal box. According to this aspect, since the bulging portion also serves as the terminal box, the space between the bulging portion and the stator can be effectively used as the internal space of the terminal box. As another aspect, a mere gap may be provided between the bulging portion and the stator.
　本発明の好ましい局面として固定手段は、モータ回転軸と平行に延びてステータを貫通するボルトであり、該ボルトの軸部先端がケーシング基部に設けられた雌ねじ穴と螺合し、該ボルトの頭部がステータに当接する。かかる局面によれば、ステータはボルト締結により軸線方向に変位しないよう確りと固定される。ボルトの長さは特に限定されない。一例としてボルトはステータよりも長く、ステータの軸線方向他方端から軸線方向一方端まで貫通する。他の例としてボルトはステータよりも短く、ステータの軸線方向一方端部にフランジ部や外径側に突出する突起を設けておき、かかるフランジ部または突起に貫通孔を設けておき、かかる貫通孔にボルトを通して締結してもよい。 As a preferred aspect of the present invention, the fixing means is a bolt extending in parallel with the motor rotation shaft and penetrating the stator, and the shaft tip end of the bolt is screwed into a female screw hole provided in the casing base, and the head of the bolt is fixed. The portion contacts the stator. According to this aspect, the stator is securely fixed so as not to be displaced in the axial direction by bolt fastening. The length of the bolt is not particularly limited. As an example, the bolt is longer than the stator and penetrates from the other axial end of the stator to the one axial end. As another example, the bolt is shorter than the stator, and a flange portion or a protrusion protruding outward is provided at one end in the axial direction of the stator, and a through hole is provided in the flange portion or protrusion. The bolt may be fastened with a bolt.
　本発明のさらに好ましい局面としてステータは当該ステータの外周面から突出する突起を有し、固定手段はステータの突起をケーシング基部に固定し、モータケーシングはステータの突起から離れるように外径側へ突出する突出部を有する。かかる局面によれば、ステータに設けた突起によって、ステータを車両用モータ駆動装置のケーシングに取り付けるための構造が実現する。またモータケーシングの突出部は、ステータの突起を回避するように突出しているから、モータケーシング内周面とステータ外周面が離隔され、ステータの振動がモータケーシングカバーへ伝達し難くされる。なお突起は、フランジのようにステータの軸線方向一方端部に設けられてもよいし、あるいは突条のようにステータの軸線方向一方端から他方端まで延びていてもよい。また突起は、固定手段の周方向配列に対応するよう、ステータの所定の周方向位置に設けられるとよい。他の局面として、ステータに突起を設けることなく、円筒形状あるいは多角形のステータをケーシング基部に取り付けてもよい。 As a further preferred aspect of the present invention, the stator has a protrusion protruding from the outer peripheral surface of the stator, the fixing means fixes the protrusion of the stator to the casing base, and the motor casing protrudes outward from the stator protrusion. Has a protruding portion. According to this aspect, the structure for attaching the stator to the casing of the vehicle motor drive device is realized by the protrusion provided on the stator. Further, since the protruding portion of the motor casing protrudes so as to avoid the protrusion of the stator, the inner peripheral surface of the motor casing and the outer peripheral surface of the stator are separated from each other, and the vibration of the stator is hardly transmitted to the motor casing cover. The protrusion may be provided at one end in the axial direction of the stator like a flange, or may extend from one end to the other end in the axial direction of the stator like a ridge. The protrusions may be provided at predetermined circumferential positions of the stator so as to correspond to the circumferential arrangement of the fixing means. As another aspect, a cylindrical or polygonal stator may be attached to the casing base without providing a protrusion on the stator.
　本発明の車両用モータ駆動装置は、電動車両のいずれかの位置に設けられる。本発明の一局面として、車輪と連結するハブ輪を回転自在に支持する車輪ハブ軸受部をさらに備え、車輪の内空領域に配置される。かかる局面によれば、ロードホイールの内空領域に配置されるインホイールモータ駆動装置において、モータ部のモータケーシングカバーから発生する不快な騒音を抑制できる。他の局面として車両用モータ駆動装置は、車体に搭載されるオンボードモータ駆動装置であってもよい。オンボードモータ駆動装置は等速継手および駆動軸を介して車輪と連結する。 The vehicle motor drive device of the present invention is provided at any position of the electric vehicle. As one aspect of the present invention, a wheel hub bearing portion that rotatably supports a hub wheel connected to the wheel is further provided, and is disposed in an inner space region of the wheel. According to this aspect, in the in-wheel motor drive device arranged in the inner space region of the road wheel, unpleasant noise generated from the motor casing cover of the motor unit can be suppressed. As another aspect, the vehicle motor drive device may be an on-board motor drive device mounted on a vehicle body. The on-board motor drive device is connected to the wheel via a constant velocity joint and a drive shaft.
　このように本発明によれば、車輪を駆動するモータにおいて、モータの端部に設けられてモータ内部のステータの端面を覆うモータケーシングカバーが、膜振動することを低減することができ、モータケーシングカバーから不快な騒音が発生することを抑制できる。 As described above, according to the present invention, in the motor that drives the wheel, the motor casing cover that is provided at the end of the motor and covers the end surface of the stator inside the motor can reduce film vibration, and the motor casing Generation of unpleasant noise from the cover can be suppressed.
本発明の一実施形態になるインホイールモータ駆動装置の内部を示す模式図である。It is a schematic diagram which shows the inside of the in-wheel motor drive device which becomes one Embodiment of this invention. 同実施形態を示す展開断面図である。It is an expanded sectional view showing the embodiment. 同実施形態のモータ部を模式的に示す縦断面図である。It is a longitudinal cross-sectional view which shows typically the motor part of the embodiment.
　以下、本発明の実施の形態を、図面に基づき詳細に説明する。図１は、本発明の一実施形態になるインホイールモータ駆動装置の内部を示す模式図であり、モータケーシングカバーを外しステータ等の位置を表す。発明の理解を容易にするため図１では、ロータ等の部品は図略される。図１中、紙面右側は車両前方を表し、紙面左側は車両後方を表し、紙面上側は車両上方を表し、紙面下側は車両下方を表す。図１では、車幅方向内側（インボード側）から車幅方向外側（アウトボード側）を視ている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing the inside of an in-wheel motor drive device according to an embodiment of the present invention, and shows the position of a stator or the like by removing a motor casing cover. In order to facilitate understanding of the invention, components such as the rotor are omitted in FIG. In FIG. 1, the right side of the drawing represents the front of the vehicle, the left side of the drawing represents the rear of the vehicle, the upper side of the drawing represents the upper side of the vehicle, and the lower side of the drawing represents the lower side of the vehicle. In FIG. 1, the vehicle width direction outer side (outboard side) is viewed from the vehicle width direction inner side (inboard side).
　図２は、同実施形態を示す展開断面図であり、図２で表される断面は、図１に示す軸線Ｍおよび軸線Ｎを含む平面と、軸線Ｎおよび軸線Ｏを含む平面を、この順序で接続した展開平面である。図２中、紙面左側は車幅方向外側（アウトボード側）を表し、紙面右側は車幅方向内側（インボード側）を表す。 FIG. 2 is a developed cross-sectional view showing the embodiment, and the cross section shown in FIG. 2 includes a plane including the axis M and the axis N and a plane including the axis N and the axis O shown in FIG. It is the expansion | deployment plane connected by. In FIG. 2, the left side of the drawing represents the vehicle width direction outside (outboard side), and the right side of the drawing represents the vehicle width direction inside (inboard side).
　図２に示すように、インホイールモータ駆動装置１０は、図示しない車輪の中心に設けられる車輪ハブ軸受部１１と、車輪を駆動するモータ部２１と、モータ部の回転を減速して車輪ハブ軸受部１１に伝達する減速部３１とを備える。モータ部２１および減速部３１は、車輪ハブ軸受部１１の軸線Ｏからオフセットして配置される。軸線Ｏは車幅方向に延び、車軸に一致する。軸線Ｏ方向位置に関し、車輪ハブ軸受部１１はインホイールモータ駆動装置１０の軸線方向一方（アウトボード側）に配置され、モータ部２１はインホイールモータ駆動装置１０の軸線方向他方（インボード側）に配置され、減速部３１はモータ部２１よりも軸線方向一方に配置され、減速部３１の軸線方向位置が車輪ハブ軸受部の軸線方向位置と重なる。 As shown in FIG. 2, the in-wheel motor drive device 10 includes a wheel hub bearing portion 11 provided at the center of a wheel (not shown), a motor portion 21 that drives the wheel, and a wheel hub bearing that decelerates the rotation of the motor portion. And a speed reduction part 31 that transmits to the part 11. The motor unit 21 and the speed reduction unit 31 are arranged offset from the axis O of the wheel hub bearing unit 11. The axis O extends in the vehicle width direction and coincides with the axle. Regarding the position in the axis O direction, the wheel hub bearing portion 11 is disposed on one side (outboard side) in the axial direction of the in-wheel motor driving device 10, and the motor portion 21 is on the other side (inboard side) in the axial direction of the in-wheel motor driving device 10. The speed reduction part 31 is arranged in one axial direction than the motor part 21, and the axial direction position of the speed reduction part 31 overlaps with the axial direction position of the wheel hub bearing part.
　インホイールモータ駆動装置１０は、電動車両の車輪を駆動する車両用モータ駆動装置である。インホイールモータ駆動装置１０は、図示しない車体に連結される。インホイールモータ駆動装置１０は、電動車両を時速０～１８０ｋｍ／ｈで走行させることができる。 The in-wheel motor drive device 10 is a vehicle motor drive device that drives wheels of an electric vehicle. The in-wheel motor drive device 10 is connected to a vehicle body (not shown). The in-wheel motor drive device 10 can drive an electric vehicle at a speed of 0 to 180 km / h.
　図２に示すように車輪ハブ軸受部１１は、回転内輪・固定外輪とされ、図示しない車輪ホイールと結合する回転輪（ハブ輪）としての内輪１２と、内輪１２の外径側に同軸に配置される固定輪としての外輪１３と、内輪１２と外輪１３との間の環状空間に配置される複数の転動体１４を有する。内輪１２の回転中心は、車輪ハブ軸受部１１の中心を通る軸線Ｏに一致する。 As shown in FIG. 2, the wheel hub bearing 11 is a rotating inner ring / fixed outer ring, and is arranged coaxially on the outer diameter side of the inner ring 12 and the inner ring 12 as a rotating wheel (hub wheel) coupled to a wheel wheel (not shown). An outer ring 13 as a fixed ring, and a plurality of rolling elements 14 disposed in an annular space between the inner ring 12 and the outer ring 13. The center of rotation of the inner ring 12 coincides with an axis O passing through the center of the wheel hub bearing portion 11.
　外輪１３の外周面には周方向で異なる位置に複数の外輪突出部１３ｆが立設される。外径方向に突出する各外輪突出部１３ｆには貫通孔が穿設される。各貫通孔は軸線Ｏと平行に延び、軸線Ｏ方向一方側からボルト１５が通される。各ボルト１５の軸部は、キャリア部材６１に穿設される雌ねじ孔と螺合する。これにより外輪１３はキャリア部材６１に連結固定される。 A plurality of outer ring protrusions 13 f are provided on the outer circumferential surface of the outer ring 13 at different positions in the circumferential direction. A through hole is formed in each outer ring protrusion 13f protruding in the outer diameter direction. Each through-hole extends in parallel with the axis O, and the bolt 15 is passed from one side in the axis O direction. A shaft portion of each bolt 15 is screwed into a female screw hole formed in the carrier member 61. As a result, the outer ring 13 is connected and fixed to the carrier member 61.
　キャリア部材６１の軸線Ｏ方向他方側には本体ケーシング３８の正面部分３８ｆが隣接して配置される。キャリア部材６１には複数の雌ねじ孔がさらに穿設される。本体ケーシング３８の正面部分３８ｆには周方向で異なる位置に複数の貫通孔が設けられ、これらの貫通孔はキャリア部材の雌ねじ孔と接続する。キャリア部材６１の雌ねじ孔および外輪突出部１３ｆの貫通孔は軸線Ｏと平行に延び、軸線Ｏ方向他方側からボルト６２が通される。各ボルト６２の軸部は、キャリア部材６１に穿設される雌ねじ孔と螺合する。これにより本体ケーシング３８はキャリア部材６１に連結固定される。 The front portion 38f of the main body casing 38 is disposed adjacent to the other side of the carrier member 61 in the axis O direction. The carrier member 61 is further provided with a plurality of female screw holes. The front portion 38f of the main body casing 38 is provided with a plurality of through holes at different positions in the circumferential direction, and these through holes are connected to the female screw holes of the carrier member. The female screw hole of the carrier member 61 and the through hole of the outer ring protrusion 13f extend in parallel to the axis O, and a bolt 62 is passed from the other side in the axis O direction. A shaft portion of each bolt 62 is screwed into a female screw hole formed in the carrier member 61. As a result, the main body casing 38 is connected and fixed to the carrier member 61.
　なお本体ケーシング３８とは、減速部３１の外郭をなすケーシングをいう。正面部分３８ｆは、本体ケーシング３８のうち減速部３１の軸線Ｏ方向一方端を覆うケーシング壁部である。外輪１３は正面部分３８ｆを貫通する。 The main body casing 38 refers to a casing that forms the outline of the speed reduction unit 31. The front portion 38 f is a casing wall portion that covers one end of the speed reduction portion 31 in the axis O direction of the main body casing 38. The outer ring 13 passes through the front portion 38f.
　内輪１２は、外輪１３よりも長い筒状体であり、外輪１３の中心孔に通される。外輪１３からインホイールモータ駆動装置１０の外部へ突出する内輪１２の軸線Ｏ方向一方端部には、結合部１２ｆが形成される。結合部１２ｆはフランジであり、図示しないブレーキロータおよび車輪と同軸に結合するための結合部を構成する。内輪１２は、結合部１２ｆで車輪のロードホイールと結合し、車輪と一体回転する。 The inner ring 12 is a cylindrical body longer than the outer ring 13 and is passed through the center hole of the outer ring 13. A coupling portion 12f is formed at one end portion in the axis O direction of the inner ring 12 protruding from the outer ring 13 to the outside of the in-wheel motor drive device 10. The coupling portion 12f is a flange and constitutes a coupling portion for coupling coaxially with a brake rotor and wheels (not shown). The inner ring 12 is coupled to the road wheel of the wheel at the coupling portion 12f and rotates integrally with the wheel.
　内輪１２および外輪１３間の環状空間には、複数列の転動体１４が配置される。内輪１２の軸線Ｏ方向中央部の外周面は、第１列に配置される複数の転動体１４の内側軌道面を構成する。内輪１２の軸線Ｏ方向他方端部外周には内側軌道輪１２ｒが嵌合する。内側軌道輪１２ｒの外周面は、第２列に配置される複数の転動体１４の内側軌道面を構成する。外輪１３の軸線Ｏ方向一方端部の内周面は、第１列の転動体１４の外側軌道面を構成する。外輪１３の軸線Ｏ方向他方端部の内周面は、第２列の転動体１４の外側軌道面を構成する。内輪１２および外輪１３間の環状空間には、シール材１６がさらに介在する。シール材１６は環状空間の両端を封止して、塵埃および異物の侵入を阻止する。内輪１２の軸線Ｏ方向他方端の中心孔には減速部３１の出力軸３７が差し込まれてスプライン嵌合する。 In the annular space between the inner ring 12 and the outer ring 13, a plurality of rows of rolling elements 14 are arranged. The outer peripheral surface of the central portion of the inner ring 12 in the direction of the axis O constitutes the inner raceway surface of the plurality of rolling elements 14 arranged in the first row. An inner race 12r is fitted to the outer periphery of the other end of the inner ring 12 in the axis O direction. The outer peripheral surface of the inner race 12r constitutes the inner race of the plurality of rolling elements 14 arranged in the second row. The inner peripheral surface at one end of the outer ring 13 in the direction of the axis O constitutes the outer raceway surface of the rolling elements 14 in the first row. An inner peripheral surface of the other end portion of the outer ring 13 in the axis O direction forms an outer raceway surface of the rolling elements 14 in the second row. A sealing material 16 is further interposed in the annular space between the inner ring 12 and the outer ring 13. The sealing material 16 seals both ends of the annular space to prevent intrusion of dust and foreign matter. The output shaft 37 of the speed reduction unit 31 is inserted into the center hole at the other end in the axis O direction of the inner ring 12 and is spline-fitted.
　モータ部２１は、モータ回転軸２２、ロータ２３、ステータ２４、およびモータケーシング２５を有し、この順序でモータ部２１の軸線Ｍから外径側へ順次配置される。モータ部２１は、インナロータ、アウタステータ形式のラジアルギャップモータであるが、他の形式であってもよい。例えば図示しなかったがモータ部２１はアキシャルギャップモータであってもよい。モータケーシング２５はステータ２４の外周を包囲する。モータケーシング２５の軸線Ｍ方向一方端は本体ケーシング３８の背面部分３８ｂと結合する。モータケーシング２５の軸線Ｍ方向他方端は、板状のモータケーシングカバー２５ｖで封止される。背面部分３８ｆは、本体ケーシング３８のうち減速部３１の軸線Ｍ方向（軸線Ｏ方向）他方端を覆うケーシング壁部である。 The motor unit 21 includes a motor rotating shaft 22, a rotor 23, a stator 24, and a motor casing 25, and is sequentially arranged from the axis M of the motor unit 21 to the outer diameter side in this order. The motor unit 21 is an inner rotor / outer stator type radial gap motor, but may be of other types. For example, although not shown, the motor unit 21 may be an axial gap motor. The motor casing 25 surrounds the outer periphery of the stator 24. One end of the motor casing 25 in the direction of the axis M is coupled to the back surface portion 38 b of the main body casing 38. The other end of the motor casing 25 in the axis M direction is sealed with a plate-like motor casing cover 25v. The back surface portion 38 f is a casing wall portion that covers the other end of the speed reduction portion 31 in the axis M direction (axis O direction) of the main body casing 38.
　本体ケーシング３８およびモータケーシング２５は、インホイールモータ駆動装置１０の外郭をなすケーシングを構成する。以下の説明において本体ケーシング３８およびモータケーシング２５の一部を、単にケーシングともいう。 The main body casing 38 and the motor casing 25 constitute a casing that forms an outline of the in-wheel motor drive device 10. In the following description, a part of the main body casing 38 and the motor casing 25 is also simply referred to as a casing.
　ステータ２４は円筒形状のステータコア２４ｂと、該ステータコア２４ｂに巻回されたコイル２４ｃを含む。ステータコア２４ｂはリング状の鋼板を軸線Ｍ方向に積層してなる。 The stator 24 includes a cylindrical stator core 24b and a coil 24c wound around the stator core 24b. The stator core 24b is formed by laminating ring-shaped steel plates in the axis M direction.
　モータ回転軸２２の両端部は、転がり軸受２７，２８を介して、本体ケーシング３８の背面部分３８ｂと、モータ部２１のモータケーシングカバー２５ｖに回転自在に支持される。モータ回転軸２２の軸線Ｍ方向他方端部には回転角センサ５２が設けられる。回転角センサ５２は転がり軸受２８よりも軸線Ｍ方向内側に配置され、モータケーシングカバー２５ｖの中央部に取り付けられる。 Both end portions of the motor rotating shaft 22 are rotatably supported by the back portion 38b of the main body casing 38 and the motor casing cover 25v of the motor portion 21 via the rolling bearings 27 and 28. A rotation angle sensor 52 is provided at the other end of the motor rotation shaft 22 in the axis M direction. The rotation angle sensor 52 is disposed on the inner side in the axis M direction with respect to the rolling bearing 28, and is attached to the central portion of the motor casing cover 25v.
　モータ回転軸２２およびロータ２３の回転中心になる軸線Ｍは、車輪ハブ軸受部１１の軸線Ｏと平行に延びる。つまりモータ部２１は、車輪ハブ軸受部１１の軸線Ｏから離れるようオフセットして配置される。例えば図１に示すようにモータ部の軸線Ｍは、軸線Ｏから車両前後方向にオフセットして、具体的には軸線Ｏよりも車両前方、に配置される。 The axis M that is the rotation center of the motor rotation shaft 22 and the rotor 23 extends in parallel with the axis O of the wheel hub bearing portion 11. That is, the motor unit 21 is disposed offset from the axis O of the wheel hub bearing unit 11. For example, as shown in FIG. 1, the axis M of the motor unit is offset from the axis O in the vehicle front-rear direction, and specifically, is arranged in front of the vehicle with respect to the axis O.
　図１に示すようにモータケーシング２５は略円筒を基調としつつ、所定の周方向位置が外径側に突出する形状である。本実施形態のモータケーシング２５は、上方へ突出する箱状の動力線端子ボックス２６ｂと、車両後方へ突出する箱状の信号線端子ボックス２６ｃと、車両前方へ突出する半円筒形状の突出部２６ｄとを含む。具体的には動力線端子ボックス２６ｂは、軸線Ｍよりも上方に配置される。信号線端子ボックス２６ｃは、軸線Ｍよりも下方かつ車両後方に配置される。突出部２６ｄは、軸線Ｍよりも下方かつ車両前方に配置される。 As shown in FIG. 1, the motor casing 25 has a substantially cylindrical shape and has a shape in which a predetermined circumferential position protrudes toward the outer diameter side. The motor casing 25 of the present embodiment includes a box-shaped power line terminal box 26b protruding upward, a box-shaped signal line terminal box 26c protruding rearward of the vehicle, and a semi-cylindrical protrusion 26d protruding forward of the vehicle. Including. Specifically, the power line terminal box 26b is disposed above the axis M. The signal line terminal box 26c is disposed below the axis M and behind the vehicle. The protrusion 26d is disposed below the axis M and in front of the vehicle.
　モータケーシング２５のうち周方向に離れたこれら３箇所の突出部の間の部分は、円筒部分２９，２９，２９を構成する。円筒部分２９，２９，２９の内壁面は軸線Ｍを中心とする円筒面である。 The portion between the three protruding portions separated in the circumferential direction in the motor casing 25 constitutes cylindrical portions 29, 29, and 29. The inner wall surfaces of the cylindrical portions 29, 29, 29 are cylindrical surfaces with the axis M as the center.
　動力線端子ボックス２６ｂは、ステータ２４の軸線Ｍ方向端部（コイルエンド）から引き出される３本のコイル端子４１を収容する。また動力線端子ボックス２６ｂには、インホイールモータ駆動装置１０の外部から延びる３本の動力線（図示せず）が引き込まれ、各動力線の端部が図示しないコネクタ構造を介して各コイル端子４１に接続される。 The power line terminal box 26b accommodates three coil terminals 41 drawn from the end portion (coil end) of the stator 24 in the axis M direction. Further, three power lines (not shown) extending from the outside of the in-wheel motor drive device 10 are drawn into the power line terminal box 26b, and the end portions of the power lines are connected to the coil terminals via a connector structure (not shown). 41.
　信号線端子ボックス２６ｃには、インホイールモータ駆動装置１０内部に設置される回転角センサ５２、温度センサ（図示せず）、その他のセンサ、といった複数のセンサから延びる導線の端部（図示せず）が集約される。また信号線端子ボックス２６ｃには、インホイールモータ駆動装置１０の外部から延びる信号線（図示せず）が引き込まれ、信号線の端部が図示しないコネクタ構造を介して導線の端部に接続される。 The signal line terminal box 26c has an end of a lead wire (not shown) extending from a plurality of sensors such as a rotation angle sensor 52, a temperature sensor (not shown), and other sensors installed in the in-wheel motor drive device 10. ) Is aggregated. Further, a signal line (not shown) extending from the outside of the in-wheel motor drive device 10 is drawn into the signal line terminal box 26c, and the end of the signal line is connected to the end of the conducting wire through a connector structure not shown. The
　図１は、モータケーシング２５からモータケーシングカバー２５ｖを取り外すことによって現れるステータ２４の端面を表す。図面の煩雑を避けるため、図１中、ステータ２４端面をハッチングで簡素化して示し、ロータ、モータ回転軸、およびステータ２４を背面部分３８ｂに固定する構造の一部を図略してある。 FIG. 1 shows the end face of the stator 24 that appears when the motor casing cover 25v is removed from the motor casing 25. FIG. In order to avoid the complexity of the drawing, the end face of the stator 24 is shown by hatching in FIG. 1 and a part of the structure for fixing the rotor, the motor rotation shaft, and the stator 24 to the back portion 38b is omitted.
　円筒部分２９，２９，２９の内周面は、ステータ２４の外周面と接触する。このように周方向に離れて配置される三箇所の円筒部分２９，２９，２９がステータ２４の外周面を外径側から支持することによって、ステータ２４は軸線Ｍと同軸になるよう位置決めされる。かかるステータ２４とモータケーシング２５の嵌め合いは圧入嵌合であってもよい。 The inner peripheral surfaces of the cylindrical portions 29, 29, 29 are in contact with the outer peripheral surface of the stator 24. The three cylindrical portions 29, 29, 29 that are spaced apart in the circumferential direction in this way support the outer peripheral surface of the stator 24 from the outer diameter side, so that the stator 24 is positioned to be coaxial with the axis M. . The fitting between the stator 24 and the motor casing 25 may be press-fitting.
　円筒部分２９に隣接してモータケーシング２５の内壁面には、溝状の切欠き２５ｇが形成される。またステータ２４の外周面にも、溝状の切欠き２４ｇが同様に形成される。各切欠き２４ｇ，２５ｇは軸線Ｍと平行に延び、円弧断面である。また切欠き２４ｇ，２５ｇは同じ周方向位置とされ、両切欠き２４ｇ，２５ｇ間に丸棒状の回り止めピン３０が差し込まれる。本実施形態では周方向複数箇所に回り止めピン３０が設置される。回り止めピン３０を弾性部材とすることにより、ステータ２４の振動がモータケーシング２５へ伝達することを低減することができる。 A groove-shaped notch 25 g is formed on the inner wall surface of the motor casing 25 adjacent to the cylindrical portion 29. A groove-shaped notch 24g is similarly formed on the outer peripheral surface of the stator 24. Each of the notches 24g and 25g extends in parallel with the axis M and has an arc cross section. Further, the notches 24g and 25g have the same circumferential position, and a round bar-shaped detent pin 30 is inserted between the notches 24g and 25g. In the present embodiment, the detent pins 30 are installed at a plurality of locations in the circumferential direction. By using the anti-rotation pin 30 as an elastic member, it is possible to reduce the vibration of the stator 24 from being transmitted to the motor casing 25.
　ステータ２４の外周面には外径側へ突出する突条２４ｄが形成される。突条２４ｄはステータコア２４ｂ（図２）の一部であり、ステータ２４の軸線Ｍ方向一方端から他方端まで延びる。本実施形態では、周方向に間隔をあけて複数個所に突条２４ｄが設けられる。各突条２４ｄには軸線Ｍと平行に延びる貫通孔２４ｈが形成される。貫通孔２４ｈは後述する固定手段が通され、これによりステータ２４はインホイールモータ駆動装置のケーシングに取付固定される。各突条２４ｄは、動力線端子ボックス２６ｂ、信号線端子ボックス２６ｃ、および突出部２６ｄにそれぞれ収容される。突出部２６ｄの内壁面と突条２４ｄの間には隙間Ｇが介在する。また別の突条２４ｄは、動力線端子ボックス２６ｂや信号線端子ボックス２６ｃの内部空間に配置されることから、突条２４ｄはこれら端子ボックスの内壁面から離隔される。突条２４ｄ、特に突条２４ｄの軸線Ｍ方向一方端部は、ステータ２４のうち背面部分３８ｂ側に取付固定される部位に相当する。 A protrusion 24d is formed on the outer peripheral surface of the stator 24 so as to protrude to the outer diameter side. The protrusion 24d is a part of the stator core 24b (FIG. 2), and extends from one end of the stator 24 in the axis M direction to the other end. In the present embodiment, the protrusions 24d are provided at a plurality of locations at intervals in the circumferential direction. Each protrusion 24d is formed with a through hole 24h extending in parallel with the axis M. The through hole 24h is passed through fixing means described later, whereby the stator 24 is attached and fixed to the casing of the in-wheel motor drive device. Each protrusion 24d is accommodated in the power line terminal box 26b, the signal line terminal box 26c, and the protrusion 26d, respectively. A gap G is interposed between the inner wall surface of the protrusion 26d and the protrusion 24d. Further, since the other protrusion 24d is disposed in the internal space of the power line terminal box 26b and the signal line terminal box 26c, the protrusion 24d is separated from the inner wall surface of these terminal boxes. The protrusion 24d, in particular, one end of the protrusion 24d in the axis M direction corresponds to a portion of the stator 24 that is attached and fixed to the back surface portion 38b.
　貫通孔２４ｈは、周方向に間隔を開けて複数設けられる。具体的には貫通孔２４ｈは、軸線Ｍよりも上方および下方にそれぞれ配置される。さらに軸線Ｍよりも下方のうち、車両前方および車両後方に貫通孔２４ｈがそれぞれ配置される。あるいは図示しない変形例として、軸線Ｍよりも上方のうち、車両前方および車両後方に貫通孔２４ｈがそれぞれ配置されてもよい。突条２４ｄも同様である。本実施形態では、突条２４ｄおよび貫通孔２４ｈが周方向等間隔に３箇所配置される。 A plurality of through holes 24h are provided at intervals in the circumferential direction. Specifically, the through holes 24h are disposed above and below the axis M, respectively. Furthermore, through holes 24 h are respectively arranged below the axis M and at the front and rear of the vehicle. Or as a modification which is not illustrated, through-hole 24h may be arranged in the vehicle front and back of the vehicle above axis M, respectively. The same applies to the protrusion 24d. In the present embodiment, three protrusions 24d and through holes 24h are arranged at equal intervals in the circumferential direction.
　キャリア部材６１は、箱状の信号線端子ボックス２６ｃよりも上方および下方へ広がり、かかる広がり部分に複数の貫通孔６３を有する。かかる貫通孔６３にボルト６２（図２）等の連結具を通すことにより、キャリア部材６１は図示しないサスペンション装置に連結される。これによりインホイールモータ駆動装置１０は、サスペンション装置を介して電動車両の車体に連結され、サスペンション装置の作用によって上下方向のバウンド・リバウンドが可能になる。またインホイールモータ駆動装置１０はサスペンション装置の作用によって左右方向の転舵が可能になる。 The carrier member 61 extends upward and downward from the box-shaped signal line terminal box 26c, and has a plurality of through holes 63 in the expanded portion. By passing a coupling tool such as a bolt 62 (FIG. 2) through the through-hole 63, the carrier member 61 is coupled to a suspension device (not shown). Thereby, the in-wheel motor drive device 10 is connected to the vehicle body of the electric vehicle via the suspension device, and can be bound and rebound in the vertical direction by the action of the suspension device. Further, the in-wheel motor drive device 10 can be steered in the left-right direction by the action of the suspension device.
　図２に示すように減速部３１は、モータ部２１のモータ回転軸２２と同軸に結合する入力軸３２ｓと、入力軸３２ｓの外周面に同軸に設けられる入力歯車３２と、複数の中間歯車３３，３５と、これら中間歯車３３，３５の中心と結合する中間軸３４と、車輪ハブ軸受部１１の内輪１２と同軸に結合する出力軸３７と、出力軸３７の外周面に同軸に設けられる出力歯車３６と、これら複数の歯車および回転軸を収容する本体ケーシング３８を有する。本体ケーシング３８は減速部３１の外郭をなすことから減速部ケーシングともいう。 As shown in FIG. 2, the speed reduction unit 31 includes an input shaft 32 s that is coaxially coupled to the motor rotation shaft 22 of the motor unit 21, an input gear 32 that is provided coaxially on the outer peripheral surface of the input shaft 32 s, and a plurality of intermediate gears 33. , 35, an intermediate shaft 34 coupled to the center of these intermediate gears 33, 35, an output shaft 37 coupled coaxially with the inner ring 12 of the wheel hub bearing 11, and an output provided coaxially on the outer peripheral surface of the output shaft 37. A gear 36 and a main body casing 38 that accommodates the plurality of gears and the rotation shaft are provided. The main body casing 38 is also referred to as a speed reduction part casing because it forms an outline of the speed reduction part 31.
　入力歯車３２は外歯のはすば歯車である。入力軸３２ｓは中空構造であり、この入力軸３２ｓの中空孔にモータ回転軸２２の軸線方向一方端部が差し込まれて相対回転不可能にスプライン嵌合（セレーションも含む、以下同じ）する。入力軸３２ｓは入力歯車３２の両端側で、転がり軸受３２ｍ，３２ｎを介して、本体ケーシング３８の正面部分３８ｆおよび背面部分３８ｂに回転自在に支持される。 The input gear 32 is a helical gear with external teeth. The input shaft 32s has a hollow structure, and one end in the axial direction of the motor rotating shaft 22 is inserted into the hollow hole of the input shaft 32s, and is spline-fitted (including serrations, the same applies hereinafter) so as not to be relatively rotatable. The input shaft 32s is rotatably supported by the front portion 38f and the rear portion 38b of the main body casing 38 via rolling bearings 32m and 32n on both ends of the input gear 32.
　減速部３１の中間軸３４の回転中心になる軸線Ｎは軸線Ｏと平行に延びる。中間軸３４の両端は、軸受３４ｍ，３４ｎを介して、本体ケーシング３８の正面部分３８ｆおよび背面部分３８ｂに回転自在に支持される。中間軸３４の中央部には、第１中間歯車３３および第２中間歯車３５が、中間軸３４の軸線Ｎと同軸に設けられる。第１中間歯車３３および第２中間歯車３５は、外歯のはすば歯車であり、第１中間歯車３３の径が第２中間歯車３５の径よりも大きい。大径の第１中間歯車３３は、第２中間歯車３５よりも軸線Ｎ方向他方側に配置されて、小径の入力歯車３２と噛合する。小径の第２中間歯車３５は、第１中間歯車３３よりも軸線Ｎ方向一方側に配置されて、大径の出力歯車３６と噛合する。 The axis N that is the center of rotation of the intermediate shaft 34 of the speed reduction portion 31 extends parallel to the axis O. Both ends of the intermediate shaft 34 are rotatably supported by the front portion 38f and the back portion 38b of the main body casing 38 via bearings 34m and 34n. A first intermediate gear 33 and a second intermediate gear 35 are provided coaxially with the axis N of the intermediate shaft 34 at the center of the intermediate shaft 34. The first intermediate gear 33 and the second intermediate gear 35 are external helical gears, and the diameter of the first intermediate gear 33 is larger than the diameter of the second intermediate gear 35. The large-diameter first intermediate gear 33 is disposed on the other side in the axis N direction with respect to the second intermediate gear 35 and meshes with the small-diameter input gear 32. The small-diameter second intermediate gear 35 is disposed on one side in the axis N direction from the first intermediate gear 33 and meshes with the large-diameter output gear 36.
　中間軸３４の軸線Ｎは、図１に示すように、軸線Ｏおよび軸線Ｍよりも上方に配置される。また中間軸３４の軸線Ｎは、軸線Ｏよりも車両前方、軸線Ｍよりも車両後方に配置される。減速部３１は、車両前後方向に間隔を空けて配置されて互いに平行に延びる軸線Ｏ，Ｎ，Ｍを有する３軸の平行軸歯車減速機である。 The axis N of the intermediate shaft 34 is disposed above the axis O and the axis M as shown in FIG. Further, the axis N of the intermediate shaft 34 is disposed in front of the vehicle with respect to the axis O and behind the vehicle with respect to the axis M. The speed reduction unit 31 is a three-axis parallel shaft gear reducer having axes O, N, and M that are arranged at intervals in the vehicle front-rear direction and extend parallel to each other.
　説明を図２に戻すと出力歯車３６は外歯のはすば歯車であり、出力軸３７の中央部に同軸に設けられる。出力軸３７は軸線Ｏに沿って延びる。出力軸３７の軸線Ｏ方向一方端部は、内輪１２の中心孔に差し込まれて相対回転不可能に嵌合する。かかる嵌合は、スプライン嵌合あるいはセレーション嵌合である。出力軸３７の軸線Ｏ方向他方端部は、転がり軸受３７ｎを介して、本体ケーシング３８の背面部分３８ｂに回転自在に支持される。 Returning to FIG. 2, the output gear 36 is an external helical gear and is provided coaxially in the center of the output shaft 37. The output shaft 37 extends along the axis O. One end of the output shaft 37 in the direction of the axis O is inserted into the center hole of the inner ring 12 and is fitted so as not to be relatively rotatable. Such fitting is spline fitting or serration fitting. The other end of the output shaft 37 in the direction of the axis O is rotatably supported by the back surface portion 38b of the main body casing 38 via a rolling bearing 37n.
　出力歯車３６の軸線Ｏ方向一方端面には、環状凸部３６ｃが形成される。環状凸部３６ｃは軸線Ｏを中心として周方向に延びる壁である。本体ケーシング３８の正面部分３８ｆには、環状凸部３６ｃよりも外径側に環状段差３８ｇが形成される。環状段差３８ｇは環状凸部３４ｃの全周を包囲する。内径側の環状凸部３６ｃと外径側の環状段差３８ｇとの間には転がり軸受３７ｍが設けられる。これにより出力軸３７の軸線Ｏ方向中央部は、転がり軸受３７ｍを介して、本体ケーシング３８の正面部分３８ｆに回転自在に支持される。 An annular convex portion 36c is formed on one end surface of the output gear 36 in the axis O direction. The annular convex portion 36c is a wall extending in the circumferential direction about the axis O. An annular step 38g is formed in the front portion 38f of the main body casing 38 on the outer diameter side of the annular protrusion 36c. The annular step 38g surrounds the entire circumference of the annular protrusion 34c. A rolling bearing 37m is provided between the annular protrusion 36c on the inner diameter side and the annular step 38g on the outer diameter side. As a result, the central portion in the direction of the axis O of the output shaft 37 is rotatably supported by the front portion 38f of the main body casing 38 via the rolling bearing 37m.
　減速部３１は、小径の駆動歯車と大径の従動歯車の噛合、即ち入力歯車３２と第１中間歯車３３の噛合、また第２中間歯車３５と出力歯車３６の噛合、により入力軸３２ｓの回転を減速して出力軸３７に伝達する。減速部３１の入力軸３２ｓから出力軸３７までの回転要素は、モータ部２１の回転を内輪１２に伝達する駆動伝達経路を構成する。 The reduction gear 31 rotates the input shaft 32s by meshing the small-diameter drive gear and the large-diameter driven gear, that is, meshing the input gear 32 and the first intermediate gear 33, and meshing the second intermediate gear 35 and the output gear 36. Is decelerated and transmitted to the output shaft 37. The rotating elements from the input shaft 32 s to the output shaft 37 of the speed reduction unit 31 constitute a drive transmission path that transmits the rotation of the motor unit 21 to the inner ring 12.
　本体ケーシング３８は、筒状部分と、当該筒状部分の両端を覆う板状の正面部分３８ｆおよび背面部分３８ｂを含む。筒状部分は、互いに平行に延びる軸線Ｏ、Ｎ、Ｍを取り囲むように減速部３１の内部部品を覆う。板状の正面部分３８ｆは、減速部３１の内部部品を軸線方向一方側から覆う。板状の背面部分３８ｂは、減速部３１の内部部品を軸線方向他方側から覆う。本体ケーシング３８の背面部分３８ｂは、モータケーシング２５と結合し、減速部３１の内部空間およびモータ部２１の内部空間を仕切る隔壁でもある。モータケーシング２５は本体ケーシング３８に支持されて、本体ケーシング３８から軸線方向他方側へ突出する。 The main body casing 38 includes a cylindrical part, and plate-like front part 38f and back part 38b covering both ends of the cylindrical part. The cylindrical portion covers the internal parts of the speed reducing portion 31 so as to surround the axes O, N, and M extending in parallel with each other. The plate-shaped front portion 38f covers the internal parts of the speed reducing portion 31 from one side in the axial direction. The plate-like back surface portion 38b covers the internal parts of the speed reducing portion 31 from the other side in the axial direction. The back surface portion 38 b of the main body casing 38 is a partition wall that is coupled to the motor casing 25 and partitions the internal space of the speed reduction portion 31 and the internal space of the motor portion 21. The motor casing 25 is supported by the main body casing 38 and protrudes from the main body casing 38 to the other side in the axial direction.
　本体ケーシング３８は、減速部３１の内部空間を区画し、減速部３１の全ての回転要素（回転軸および歯車）を内部空間に収容する。図１に示すように本体ケーシング３８の下部は、オイル貯留部３９とされる。オイル貯留部３９はモータ部２１よりも低位置に配置される。本体ケーシング３８の内部空間の下部を占めるオイル貯留部３９には、モータ部２１および減速部３１を潤滑する潤滑油が貯留する。 The main body casing 38 defines an internal space of the speed reducing portion 31 and accommodates all the rotating elements (rotating shafts and gears) of the speed reducing portion 31 in the internal space. As shown in FIG. 1, the lower part of the main body casing 38 is an oil storage part 39. The oil reservoir 39 is disposed at a lower position than the motor unit 21. Lubricating oil that lubricates the motor unit 21 and the speed reduction unit 31 is stored in the oil storage unit 39 that occupies the lower part of the internal space of the main body casing 38.
　入力軸３２ｓと、中間軸３４と、出力軸３７は、上述した転がり軸受によって両持ち支持される。これらの転がり軸受３２ｍ，３４ｍ，３７ｍ，３２ｎ，３４ｎ，３７ｎはラジアル軸受である。 The input shaft 32s, the intermediate shaft 34, and the output shaft 37 are supported at both ends by the above-described rolling bearings. These rolling bearings 32m, 34m, 37m, 32n, 34n, and 37n are radial bearings.
　環状凸部３６ｃと出力軸３７と出力歯車３６の軸線Ｏ方向一方端面は軸線Ｏ方向に窪んだ環状凹部を構成する。かかる環状凹部は内輪１２の軸線Ｏ方向他方端部および内側軌道輪１２ｒの軸線Ｏ方向他方端部を収容する。このように軸線Ｏ方向位置に関し、内輪１２と転がり軸受３７ｍとを重ねるように配置して、インホイールモータ駆動装置１０の軸線方向寸法を小さくすることができる。 The one end surface of the annular convex portion 36c, the output shaft 37, and the output gear 36 in the axis O direction forms an annular concave portion that is recessed in the axis O direction. The annular recess accommodates the other end of the inner ring 12 in the axis O direction and the other end of the inner race 12r in the axis O direction. Thus, with respect to the position in the direction of the axis O, the inner ring 12 and the rolling bearing 37m can be arranged so as to overlap each other, so that the axial dimension of the in-wheel motor drive device 10 can be reduced.
　インホイールモータ駆動装置１０外部から上述したコイル端子４１に電力が供給されると、モータ部２１のロータ２３が回転し、モータ回転軸２２から減速部３１に回転を出力する。減速部３１はモータ部２１から入力軸３２ｓに入力された回転を減速し、出力軸３７から車輪ハブ軸受部１１へ出力する。車輪ハブ軸受部１１の内輪１２は、出力軸３７と同じ回転数で回転し、内輪１２に取付固定される図示しない車輪を駆動する。 When electric power is supplied to the above-described coil terminal 41 from the outside of the in-wheel motor drive device 10, the rotor 23 of the motor unit 21 rotates and outputs rotation from the motor rotation shaft 22 to the speed reduction unit 31. The speed reduction part 31 decelerates the rotation input to the input shaft 32 s from the motor part 21 and outputs it from the output shaft 37 to the wheel hub bearing part 11. The inner ring 12 of the wheel hub bearing portion 11 rotates at the same rotational speed as the output shaft 37 and drives a wheel (not shown) attached and fixed to the inner ring 12.
　次に上述したモータ部のステータをインホイールモータ駆動装置のケーシングに固定する構造につき補足説明する。 Next, a supplementary description will be given of the structure for fixing the stator of the motor unit described above to the casing of the in-wheel motor drive device.
　図３はモータ部を図１にIII－IIIで示す平面で切断し、この断面を矢の方向にみた状態を模式的に示す縦断面図であり、図２に示すモータ部の断面とは異なる断面を表わす。図３中、ステータ２４の他方端を覆うモータケーシングカバー２５ｖは二点鎖線で表される。互いに突き合わされるモータケーシングカバー２５ｖの突合面２５ｄとモータケーシング２５の突合面２５ｄは、平坦面である。これら突合面２５ｄは、モータ部２１の軸線Ｍ方向他方端に配置される。本実施形態では、突合面２５ｄの軸線Ｍ方向位置がステータ２４の軸線Ｍ方向位置と重なるが、この他にも突合面２５ｄがステータ２４よりも軸線Ｍ方向他方に配置されてもよい。モータケーシングカバー２５ｖは図示しないボルト等の固定手段でモータケーシング２５に固定される。モータケーシングカバー２５ｖは、ステータ２４から軸線Ｍ方向他方側に離隔される。 3 is a longitudinal sectional view schematically showing a state in which the motor section is cut along a plane indicated by III-III in FIG. 1 and this section is viewed in the direction of the arrow, and is different from the section of the motor section shown in FIG. Represents a cross section. In FIG. 3, the motor casing cover 25v covering the other end of the stator 24 is represented by a two-dot chain line. The abutting surface 25d of the motor casing cover 25v and the abutting surface 25d of the motor casing 25 that are abutted against each other are flat surfaces. These abutting surfaces 25d are disposed at the other end of the motor unit 21 in the axis M direction. In the present embodiment, the position of the abutting surface 25d in the axis M direction overlaps the position of the stator 24 in the axis M direction, but the abutting surface 25d may be disposed on the other side in the axis M direction than the stator 24. The motor casing cover 25v is fixed to the motor casing 25 by fixing means such as a bolt (not shown). The motor casing cover 25v is separated from the stator 24 on the other side in the axis M direction.
　ステータ２４の軸線Ｍ方向一方端にはケーシング基部３８ｃが設けられる。ケーシング基部３８ｃは、背面部分３８ｂの軸線Ｍ方向他方壁面に設けられ、ケーシング基部３８ｃよりも内径側の他方壁面から軸線Ｍ方向他方へ突出する。ケーシング基部３８ｃの突出端は軸線Ｍと直角な平坦面とされる。ケーシング基部３８ｃの突出端には雌ねじ穴３８ｄが形成される。雌ねじ穴３８ｄは、軸線Ｍ方向他方へ指向する。ケーシング基部３８ｃは、動力線端子ボックス２６ｂと同じ周方向位置に配置される。また他のケーシング基部３８ｃは、信号線端子ボックス２６ｃ（図１）と、突出部２６ｄ（図１）と同じ周方向位置に配置される。本実施形態のケーシング基部３８ｃは１２０°で周方向等間隔に配置される。 A casing base 38c is provided at one end of the stator 24 in the axis M direction. The casing base 38c is provided on the other wall surface in the axis M direction of the back surface portion 38b, and protrudes from the other wall surface on the inner diameter side to the other in the axis M direction from the casing base 38c. The protruding end of the casing base 38 c is a flat surface perpendicular to the axis M. A female screw hole 38d is formed at the protruding end of the casing base 38c. The female screw hole 38d is directed to the other side in the axis M direction. The casing base 38c is disposed at the same circumferential position as the power line terminal box 26b. The other casing base 38c is disposed at the same circumferential position as the signal line terminal box 26c (FIG. 1) and the protruding portion 26d (FIG. 1). The casing bases 38c of the present embodiment are arranged at equal intervals in the circumferential direction at 120 °.
　図３に示すようにケーシング基部３８ｃは、モータケーシング２５の軸線Ｍ方向一方端と一体形成される。背面部分３８ｂは、モータ回転軸２２が貫通する中央孔３８ｅを有し、当該中心孔３８ｅに隣接して転がり軸受２７が同軸に設けられる。 As shown in FIG. 3, the casing base 38 c is formed integrally with one end of the motor casing 25 in the axis M direction. The back surface portion 38b has a central hole 38e through which the motor rotating shaft 22 passes, and a rolling bearing 27 is provided coaxially adjacent to the central hole 38e.
　ステータ２４の貫通孔２４ｈには、軸線Ｍ方向他方から固定手段としてのボルト５１が通される。ボルト５１の先端部がケーシング基部３８ｃの雌ねじ穴３８ｄに螺合してボルト５１の頭部が締め込まれると、ボルト５１の頭部が突条２４ｄの軸線Ｍ方向他方端に当接してステータ２４をケーシング基部３８ｃに押圧する。これによりステータ２４は軸線Ｍ方向に移動不能に取付固定される。 A bolt 51 as a fixing means is passed through the through hole 24h of the stator 24 from the other side in the axis M direction. When the front end of the bolt 51 is screwed into the female screw hole 38d of the casing base 38c and the head of the bolt 51 is tightened, the head of the bolt 51 comes into contact with the other end in the axis M direction of the protrusion 24d. Is pressed against the casing base 38c. As a result, the stator 24 is fixedly attached so as not to move in the direction of the axis M.
　ここで附言すると、モータケーシング２５は、一部で二重壁にされる。例えばモータケーシング２５の下部は、円筒部分２９を内壁とし、軸線Ｍ方向一方が低くなり軸線Ｍ方向他方が高くなる傾斜壁２５ｎを外壁として有する。 Suppose here that a part of the motor casing 25 is a double wall. For example, the lower portion of the motor casing 25 has a cylindrical portion 29 as an inner wall and an inclined wall 25n whose one side in the axis M direction is lower and the other in the axis M direction is higher as an outer wall.
　動力線端子ボックス２６ｂは、モータケーシング２５の軸線Ｍ方向一方端から他方端まで形成され、ケーシング基部３８ｃと隣接する。なお図示はしなかったが、信号線端子ボックス２６ｃおよび突出部２６ｄも同様である。このため突条２４ｄは、図３に示すように突条２４ｄの全長において動力線端子ボックス２６ｂから離隔する。信号線端子ボックス２６ｃおよび突出部２６ｄも同様に、突条２４ｄから離隔する。 The power line terminal box 26b is formed from one end to the other end in the axis M direction of the motor casing 25 and is adjacent to the casing base 38c. Although not shown, the signal line terminal box 26c and the protruding portion 26d are the same. For this reason, the protrusion 24d is separated from the power line terminal box 26b in the entire length of the protrusion 24d as shown in FIG. Similarly, the signal line terminal box 26c and the protruding portion 26d are separated from the protrusion 24d.
　図１に示すように、突合面２５ｄは帯状に延びて、ステータ２４を囲繞する。具体的には突合面２５ｄはステータ２４の外周面に沿って円弧状に延びる近接部分２５ｇを含む。さらに突合面２５ｄは、動力線端子ボックス２６ｂの輪郭と、信号線端子ボックス２６ｃの輪郭と、突出部２６ｄの輪郭をなす。かかる突合面２５ｄの輪郭部分は、ステータ２４の外周面から離れるように外径側へ突出する膨らみ部分２５ｆになる。 As shown in FIG. 1, the abutting surface 25 d extends in a band shape and surrounds the stator 24. Specifically, the abutting surface 25 d includes a proximity portion 25 g that extends in an arc shape along the outer peripheral surface of the stator 24. Furthermore, the abutting surface 25d forms the contour of the power line terminal box 26b, the contour of the signal line terminal box 26c, and the contour of the protruding portion 26d. The contour portion of the abutting surface 25d becomes a bulging portion 25f that protrudes toward the outer diameter side so as to be away from the outer peripheral surface of the stator 24.
　図１に示すようにモータ部２１の軸線Ｍに関し、貫通孔２４ｈが配置される周方向位置は、突出部２６ｄの周方向位置と重なるよう配置される。また貫通孔２４ｈが配置される周方向位置は、動力線端子ボックス２６ｂの周方向位置と重なるよう配置される。また貫通孔２４ｈが配置される周方向位置は、信号線端子ボックス２６ｃの周方向位置と重なるよう配置される。つまり各貫通孔２４ｈに通されるステータ固定手段としてのボルト５１（図３）の周方向位置は、これら膨らみ部分２５ｆの周方向位置と重なるよう配置される。 As shown in FIG. 1, with respect to the axis M of the motor portion 21, the circumferential position where the through hole 24h is disposed is disposed so as to overlap the circumferential position of the protruding portion 26d. The circumferential position where the through hole 24h is arranged is arranged so as to overlap the circumferential position of the power line terminal box 26b. Further, the circumferential position where the through hole 24h is disposed is disposed so as to overlap the circumferential position of the signal line terminal box 26c. That is, the circumferential positions of the bolts 51 (FIG. 3) as the stator fixing means that are passed through the respective through holes 24h are arranged so as to overlap the circumferential positions of the bulging portions 25f.
　ところで本実施形態のインホイールモータ駆動装置１０は、車輪を駆動するモータ部２１を備える。モータ部２１は、モータ回転軸２２と、モータ回転軸２２と結合するロータ２３と、ロータ２３と隙間を介して対面する筒状のステータ２４と、ステータ２４の外周を包囲するモータケーシング２５と、ステータ２４の軸線Ｍ方向一方端を支持するケーシング基部３８ｃと、ステータ２４の軸線Ｍ方向他方端を覆うモータケーシングカバー２５ｖと、モータ回転軸２２回りにおける所定の周方向位置に配置されてステータ２４をケーシング基部３８ｃに固定するボルト５１（固定手段）とを有する。モータケーシング２５およびモータケーシングカバー２５ｖは、軸線Ｍ方向に互いに突き合わされる突合面２５ｄをそれぞれ有する。図１に示すようにモータケーシング２５の突合面２５ｄは、ステータ２４の外周面を囲繞する形状であって、ステータ２４の外周面に沿って延びる近接部分２５ｇと、ステータ２４の外周面から離れるように外径側へ突出する膨らみ部分２５ｆとを含む。そしてボルト５１が配置される所定の周方向位置は、膨らみ部分１５ｆの周方向位置と重なる。 By the way, the in-wheel motor drive device 10 of this embodiment is provided with the motor part 21 which drives a wheel. The motor unit 21 includes a motor rotating shaft 22, a rotor 23 coupled to the motor rotating shaft 22, a cylindrical stator 24 facing the rotor 23 via a gap, a motor casing 25 surrounding the outer periphery of the stator 24, A casing base 38c that supports one end of the stator 24 in the axis M direction, a motor casing cover 25v that covers the other end of the stator 24 in the axis M direction, and a stator 24 that is disposed at a predetermined circumferential position around the motor rotation shaft 22. And a bolt 51 (fixing means) for fixing to the casing base 38c. The motor casing 25 and the motor casing cover 25v each have an abutting surface 25d that abuts each other in the direction of the axis M. As shown in FIG. 1, the abutting surface 25 d of the motor casing 25 has a shape surrounding the outer peripheral surface of the stator 24, and is separated from the adjacent portion 25 g extending along the outer peripheral surface of the stator 24 and the outer peripheral surface of the stator 24. And a bulging portion 25f protruding to the outer diameter side. And the predetermined circumferential direction position where the volt | bolt 51 is arrange | positioned overlaps with the circumferential direction position of the bulging part 15f.
　かかる本実施形態によれば、モータケーシング２５がボルト５１から離隔される。またモータケーシング２５が、ステータ２４のうちボルト５１と連結する突条２４ｄからも離隔される。したがってモータ部２１が車輪を駆動する際にステータ２４自身が微振動しても、かかる振動はボルト５１を経由してケーシング基部３８ｃに主に伝達するので、モータケーシング２５に伝達する振動を低減できる。したがって突合面２５ｄでモータケーシング２５に突き合わされるモータケーシングカバー２５ｖは殆ど加振されない。本願発明によれば、ステータ２４の軸線Ｍ方向他方端面を覆うモータケーシングカバー２５ｖの膜振動を低減して不快な騒音を抑制することができる。 According to this embodiment, the motor casing 25 is separated from the bolt 51. Further, the motor casing 25 is also separated from the protrusion 24 d connected to the bolt 51 in the stator 24. Therefore, even if the stator 24 itself vibrates slightly when the motor unit 21 drives the wheel, the vibration is mainly transmitted to the casing base 38c via the bolt 51, so that the vibration transmitted to the motor casing 25 can be reduced. . Therefore, the motor casing cover 25v that abuts the motor casing 25 at the abutting surface 25d is hardly vibrated. According to the present invention, unpleasant noise can be suppressed by reducing the membrane vibration of the motor casing cover 25v covering the other end surface of the stator 24 in the axis M direction.
　また本実施形態のモータケーシング２５は、ステータ２４に設けられるコイル２４ｃから延びる動力線の端部およびコイル端子４１を収納する箱状の動力線端子ボックス２６ｂと、車両用モータ駆動装置内部に設けられるセンサから延びる信号線端子ボックス２６ｃを含む。突合面２５ｄの膨らみ部分２５ｆは、これら端子ボックスの輪郭をなす。かかる本実施形態によれば、膨らみ部分２５ｆが端子ボックスを兼用することから、膨らみ部分２５ｆとステータ２４との間の空間を端子ボックスとして有効利用することができる。 Further, the motor casing 25 of the present embodiment is provided in a box-shaped power line terminal box 26 b that houses the end of the power line extending from the coil 24 c provided in the stator 24 and the coil terminal 41, and the vehicle motor drive device. A signal line terminal box 26c extending from the sensor is included. The bulging portion 25f of the abutting surface 25d forms the outline of these terminal boxes. According to this embodiment, since the bulging portion 25f also serves as a terminal box, the space between the bulging portion 25f and the stator 24 can be effectively used as a terminal box.
　また本実施形態では、ステータ２４をケーシング基部３８ｃに固定する固定手段は、モータ回転軸２２と平行に延びてステータ２４を貫通するボルト５１であり、ボルト５１の軸部先端がケーシング基部３８ｃに設けられた雌ねじ穴３８ｄと螺合し、ボルト５１の頭部がステータ２４の軸線Ｍ方向他方端に当接する。これによりステータ２４は、ボルト締結することにより軸線Ｍ方向に変位しないよう確りと固定される。 In the present embodiment, the fixing means for fixing the stator 24 to the casing base 38c is a bolt 51 that extends parallel to the motor rotation shaft 22 and penetrates the stator 24, and the shaft 51 tip of the bolt 51 is provided on the casing base 38c. The bolt 51 is screwed into the female screw hole 38d, and the head of the bolt 51 comes into contact with the other end of the stator 24 in the axis M direction. Thereby, the stator 24 is firmly fixed so as not to be displaced in the direction of the axis M by fastening the bolt.
　また本実施形態のステータ２４は、ステータ２４の外周面から突出する突条２４ｄを有し、ステータ２４を固定する手段になるボルト５１は突条２４ｄをケーシング基部３８ｃに固定する。モータケーシング２５は、突条２４ｄから離れるように外径側へ突出する突出部２６ｄを有する。突条２４ｄは、ステータ２４をインホイールモータ駆動装置１０のケーシングに取り付けるための構造を提供する。 Further, the stator 24 of this embodiment has a protrusion 24d protruding from the outer peripheral surface of the stator 24, and a bolt 51 serving as a means for fixing the stator 24 fixes the protrusion 24d to the casing base 38c. The motor casing 25 has a protruding portion 26d that protrudes toward the outer diameter side away from the protrusion 24d. The protrusion 24d provides a structure for attaching the stator 24 to the casing of the in-wheel motor drive device 10.
　以上、図面を参照して本発明の実施の形態を説明したが、本発明は、図示した実施の形態のものに限定されない。図示した実施の形態に対して、本発明と同一の範囲内において、あるいは均等の範囲内において、種々の修正や変形を加えることが可能である。 The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range as the present invention or within an equivalent range.
　本発明になる車両用モータ駆動装置は、電気自動車およびハイブリッド車両において有利に利用される。 The vehicle motor drive device according to the present invention is advantageously used in electric vehicles and hybrid vehicles.
　１０　インホイールモータ駆動装置、１１　車輪ハブ軸受部、１２　内輪、２１　モータ部、２２　モータ回転軸、２３　ロータ、２４　ステータ、２４ｂ　ステータコア、２４ｃ　コイル、２４ｄ　突条（突起）、２４ｈ　貫通孔、２５　モータケーシング、２５ｄ　突合面、２５ｇ　近接部分、２５ｆ　膨らみ部分、２５ｖ　モータケーシングカバー、２６ｂ　動力線端子ボックス（突出部）、２６ｃ　信号線端子ボックス（突出部）、２６ｄ　突出部、２９　円筒部分、３０　回り止めピン、３１　減速部、３８　本体ケーシング、３８ｂ　背面部分、３８ｃ　ケーシング基部、３８ｄ　雌ねじ穴、５１　ボルト（固定手段）、６１　キャリア部材、Ｇ　隙間、Ｍ，Ｎ，Ｏ　軸線。 10 in-wheel motor drive unit, 11 wheel hub bearing part, 12 inner ring, 21 motor part, 22 motor rotating shaft, 23 rotor, 24 stator, 24b stator core, 24c coil, 24d protrusion (projection), 24h through hole, 25 motor Casing, 25d mating surface, 25g proximity part, 25f bulging part, 25v motor casing cover, 26b power line terminal box (protruding part), 26c signal line terminal box (protruding part), 26d projecting part, 29 cylindrical part, 30 anti-rotation Pin, 31 deceleration part, 38 body casing, 38b rear part, 38c casing base, 38d female screw hole, 51 bolt (fixing means), 61 carrier member, G gap, M, N, O axis.

Claims (5)

  1. 　車輪を駆動するモータ部を備え、
    　前記モータ部は、モータ回転軸と、前記モータ回転軸と結合するロータと、前記ロータと隙間を介して対面する筒状のステータと、前記ステータの外周を包囲するモータケーシングと、前記ステータの一方端を支持するケーシング基部と、前記ステータの他方端を覆うモータケーシングカバーと、前記モータ回転軸回りにおける所定の周方向位置に配置されて前記ステータを前記ケーシング基部に固定する固定手段とを有し、
    　前記モータケーシングおよび前記ケーシングカバーは、軸線方向に互いに突き合わされる突合面をそれぞれ有し、
    　前記モータケーシングの前記突合面は、前記ステータの外周面を囲繞する形状であって、前記ステータの外周面に沿って延びる近接部分と、前記ステータの外周面から離れるように外径側へ突出する膨らみ部分とを含み、
    　前記固定手段が配置される前記所定の周方向位置は、前記膨らみ部分の周方向位置と重なる、車両用モータ駆動装置。     It has a motor part that drives the wheels,
    The motor unit includes a motor rotating shaft, a rotor coupled to the motor rotating shaft, a cylindrical stator facing the rotor via a gap, a motor casing surrounding the outer periphery of the stator, and one of the stators A casing base that supports the end; a motor casing cover that covers the other end of the stator; and a fixing means that is disposed at a predetermined circumferential position around the motor rotation shaft and fixes the stator to the casing base. ,
    The motor casing and the casing cover each have an abutting surface that is abutted against each other in the axial direction,
    The abutting surface of the motor casing has a shape surrounding the outer peripheral surface of the stator, and protrudes toward the outer diameter side away from the adjacent portion extending along the outer peripheral surface of the stator and away from the outer peripheral surface of the stator. Including a bulging portion,
    The vehicle motor drive device, wherein the predetermined circumferential position where the fixing means is disposed overlaps with a circumferential position of the bulging portion.
  2. 　前記モータケーシングは、前記ステータに設けられるコイルから延びるコイル端子、車両用モータ駆動装置の外部から引き込まれる動力線の端部、車両用モータ駆動装置内部に設けられるセンサから延びる導線の端子、および車両用モータ駆動装置の外部から引き込まれる信号線の端部、のうち少なくとも１を収納する箱状の端子ボックスを含み、
    　前記突合面の前記膨らみ部分は、前記端子ボックスの輪郭をなす、請求項１に記載の車両用モータ駆動装置。     The motor casing includes a coil terminal extending from a coil provided in the stator, an end of a power line drawn from the outside of the vehicle motor driving device, a terminal of a conductive wire extending from a sensor provided in the vehicle motor driving device, and a vehicle Including a box-shaped terminal box that houses at least one of the end portions of the signal line drawn from outside the motor drive device
    The vehicular motor drive device according to claim 1, wherein the bulging portion of the abutting surface forms an outline of the terminal box.
  3. 　前記固定手段は、前記モータ回転軸と平行に延びて前記ステータを貫通するボルトであり、
    　前記ボルトの軸部先端が前記ケーシング基部に設けられた雌ねじ穴と螺合し、
    　前記ボルトの頭部が前記ステータに当接する、請求項１または２に記載の車両用モータ駆動装置。     The fixing means is a bolt that extends parallel to the motor rotation shaft and penetrates the stator,
    The shaft tip of the bolt is screwed into a female screw hole provided in the casing base,
    The vehicle motor drive device according to claim 1, wherein a head portion of the bolt abuts on the stator.
  4. 　前記ステータは、当該ステータの外周面から突出する突起を有し、
    　前記固定手段は、前記突起を前記ケーシング基部に固定し、
    　前記モータケーシングは、前記突起から離れるように外径側へ突出する突出部を有する、請求項１～３のいずれかに記載の車両用モータ駆動装置。     The stator has a protrusion protruding from the outer peripheral surface of the stator,
    The fixing means fixes the protrusion to the casing base,
    The vehicle motor drive device according to any one of claims 1 to 3, wherein the motor casing has a projecting portion that projects outward from the projecting portion.
  5. 　前記車輪と連結するハブ輪を回転自在に支持する車輪ハブ軸受部をさらに備え、前記車輪の内空領域に配置される、請求項１～４のいずれかに記載の車両用モータ駆動装置。 The vehicle motor drive device according to any one of claims 1 to 4, further comprising a wheel hub bearing portion that rotatably supports a hub wheel connected to the wheel, and disposed in an inner space region of the wheel.
PCT/JP2019/004245 2018-02-08 2019-02-06 Motor drive device for vehicle WO2019156119A1 (en)

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JP2022081336A (en) * 2020-11-19 2022-05-31 日本電産株式会社 Motor and drive device

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JP2017125581A (en) * 2016-01-14 2017-07-20 トヨタ自動車株式会社 Power transmission device of vehicle

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