WO2023149551A1 - Drive device - Google Patents

Drive device Download PDF

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Publication number
WO2023149551A1
WO2023149551A1 PCT/JP2023/003585 JP2023003585W WO2023149551A1 WO 2023149551 A1 WO2023149551 A1 WO 2023149551A1 JP 2023003585 W JP2023003585 W JP 2023003585W WO 2023149551 A1 WO2023149551 A1 WO 2023149551A1
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WO
WIPO (PCT)
Prior art keywords
flow path
stator
rotor
fluid
coil
Prior art date
Application number
PCT/JP2023/003585
Other languages
French (fr)
Japanese (ja)
Inventor
直大 和田
啓介 麻生
竜彦 水谷
祐輔 牧野
Original Assignee
ニデック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ニデック株式会社 filed Critical ニデック株式会社
Publication of WO2023149551A1 publication Critical patent/WO2023149551A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • 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 drive system used in electric vehicles and hybrid vehicles.
  • This application claims priority based on Japanese Patent Application No. 2022-015890 filed in Japan on February 3, 2022, the content of which is incorporated herein.
  • Patent Literature 1 discloses an electric motor that cools the stator by supplying a coolant to the stator from a coolant inlet located radially outside of the stator core.
  • An object of one aspect of the present invention is to provide a driving device that can efficiently cool the stator.
  • One aspect of the drive device of the present invention includes a motor having a rotor that rotates about a central axis and a stator that is positioned radially outward of the rotor, a housing provided with a housing space for housing the motor, a fluid the housing has a cylindrical portion that radially surrounds the stator, and the flow channel extends axially through a wall of the cylindrical portion. and a radial flow path extending radially inward from the axial flow path and opening toward the stator.
  • a driving device that can efficiently cool the stator.
  • FIG. 1 is a conceptual diagram of the driving device of the first embodiment.
  • FIG. 2 is a cross-sectional view of the motor of the first embodiment.
  • FIG. 3 is an enlarged cross-sectional view of the stator of the first embodiment.
  • FIG. 4 is a perspective view of the rotor of the first embodiment.
  • 5 is a rear view of the end plate of the first embodiment.
  • FIG. 6 is a conceptual diagram of the driving device of the second embodiment.
  • FIG. 7 is a conceptual diagram of the driving device of the third embodiment.
  • a driving device 1 according to a first embodiment of the present invention will be described below with reference to the drawings. It should be noted that the scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention.
  • the direction of gravity will be defined based on the positional relationship when the driving device 1 is mounted on a vehicle positioned on a horizontal road surface.
  • an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system.
  • the Z-axis direction indicates the vertical direction (that is, the vertical direction)
  • the +Z direction is the upper side (the side opposite to the direction of gravity)
  • the ⁇ Z direction is the lower side (the direction of gravity).
  • the X-axis direction is a direction perpendicular to the Z-axis direction and indicates the front-rear direction of the vehicle in which the driving device 1 is mounted.
  • the +X side is the front side of the vehicle, and the -X side is the rear side of the vehicle.
  • the Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and indicates the width direction (horizontal direction) of the vehicle.
  • the +Y side is the left side of the vehicle and the -Y side is the right side of the vehicle.
  • the positional relationship in the longitudinal direction is not limited to the positional relationship of this embodiment, and the +X side may be the rear side of the vehicle and the ⁇ X side may be the front side of the vehicle. In this case, the +Y side is the right side of the vehicle and the -Y side is the left side of the vehicle.
  • the direction parallel to the central axis J2 of the motor 2 (Y-axis direction) is simply referred to as the "axial direction,” and the radial direction about the central axis J2 is simply referred to as the "radial direction.”
  • the circumferential direction centered on the central axis J2, that is, the circumference of the central axis J2 is simply called the "circumferential direction”.
  • extending along” a predetermined direction means extending in a strictly predetermined direction, as well as a It includes the case where it extends in the direction.
  • the driving device 1 according to the first embodiment will be described below.
  • the drive device 1 of the present embodiment is mounted on a vehicle using a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), and is used as the power source.
  • a motor such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), and is used as the power source.
  • HEV hybrid vehicle
  • EV electric vehicle
  • the driving device 1 includes a motor 2, a housing 6, a fluid O circulating in the housing 6, channels 90 and 100 through which the fluid O flows, a pump 96, a cooler 97, a tank 99, and a Prepare. Further, the driving device 1 has a gear portion (not shown).
  • the gear section has a plurality of gears connected to the shaft 21 of the motor 2 and driven by the motor 2 .
  • the gear section decelerates the output of the motor 2 and transmits it to the wheels of the vehicle.
  • the direction from the motor 2 to the gear portion is called the one axial direction side (+Y side), and the direction from the gear portion to the motor 2 is called the other axial direction side ( ⁇ Y side). .
  • a housing space 80 for housing the motor 2 is provided inside the housing 6 . That is, the motor 2 is accommodated in the accommodation space 80 .
  • the housing 6 holds the motor 2 in the accommodation space 80 .
  • the motor 2 may be fixed to the housing 6 with bolts (not shown) or the like, or may be fixed by shrink fitting, insertion, or the like.
  • a fluid reservoir P in which the fluid O is accumulated is provided in the lower region within the housing space 80 .
  • the fluid O accumulated in the lower region of the accommodation space 80 is moved from the fluid reservoir P to the tank 99 by the pump 96 described later.
  • the housing 6 has a tubular portion 61 , a second housing portion 62 and a third housing portion 63 .
  • the cylindrical portion 61 has a cylindrical shape centered on the central axis J2.
  • the cylindrical portion 61 surrounds the stator 30 of the motor 2 from the outside in the radial direction.
  • the second housing portion 62 covers the opening on one axial side (+Y side) of the cylindrical portion 61 .
  • the third housing portion 63 covers the opening of the cylindrical portion 61 on the other axial side ( ⁇ Y side).
  • the housing 6 has a plurality of ribs on its outer peripheral surface.
  • the housing 6 has a horizontal first rib parallel to the horizontally extending central axis J2 of the motor 2, which will be described later, and a second rib extending in the circumferential direction of the central axis J2. As a result, it is possible to suppress amplification of the vibration and sound caused by the rotation of the motor 2 by the housing 6 .
  • the motor 2 is housed in the housing space 80 of the housing 6 .
  • the motor 2 includes a rotor 20 that rotates about a central axis J2 extending in the horizontal direction, a stator 30 positioned radially outside the rotor 20, and a pair of bearings (first bearings 26) that rotatably support the rotor 20. and a second bearing 27).
  • the motor 2 of this embodiment is an inner rotor type motor.
  • the rotor 20 rotates when AC current is supplied to the stator 30 via a battery and an inverter unit (not shown).
  • the rotor 20 has a shaft 21 , a rotor core 24 , a plurality of rotor magnets 25 and a pair of end plates 28 .
  • Rotor 20 (that is, shaft 21, rotor core 24, and rotor magnet 25) rotates about a central axis J2 extending horizontally and in the width direction of the vehicle.
  • the shaft 21 extends axially around the central axis J2.
  • the shaft 21 rotates about the central axis J2.
  • the shaft 21 is a hollow shaft having a hollow portion 22 therein which is an axially extending cavity. That is, the hollow portion 22 is positioned within the shaft 21 and extends in the axial direction.
  • the hollow portion 22 is a so-called double cylinder.
  • the shaft 21 is rotatably supported by a pair of bearings (first bearing 26 and second bearing 27).
  • the first bearing 26 and the second bearing 27 are located in the accommodation space 80 .
  • a first bearing 26 and a second bearing 27 are rotatably supported on both axial sides of the shaft 21 with the rotor core 24 interposed therebetween.
  • a first bearing 26 and a second bearing 27 are held in the housing 6 . More specifically, the first bearing 26 is held in the second housing portion 62 and the second bearing 27 is held in the third housing portion 63 .
  • the rotor core 24 is constructed by laminating silicon steel plates.
  • the rotor core 24 is a substantially cylindrical body extending axially about the center axis J2. As shown in FIG. 2, the rotor core 24 is provided with a plurality of holding holes 24h in which the rotor magnets 25 are accommodated.
  • the rotor magnet 25 is fixed to the inner surface of the holding hole 24h. Thereby, the rotor magnet 25 is fixed to the rotor core 24 .
  • a plurality of rotor magnets 25 are arranged along the circumferential direction with magnetic poles alternated.
  • the pair of end plates 28 are arranged at both ends of the rotor core 24 in the axial direction. Each end plate covers the axial end face of the rotor core 24 .
  • the end plate 28 covers the holding hole 24h that opens in the end face of the rotor core 24. As shown in FIG. As a result, the end plate 28 prevents the rotor magnet 25 accommodated in the holding hole 24h from slipping out of the holding hole 24h.
  • each end plate 28 is a bowl shape having a curved portion that is convex on the side opposite to the end face in the axial direction of the rotor core 24 .
  • a through-hole 28 h is provided in substantially the center of the end plate 28 .
  • the shaft 21 is passed through the through hole 28h.
  • the end plate 28 has a flat surface near the opening of the through hole 28h on the surface facing away from the rotor core 24.
  • Both ends of the shaft 21 are provided with male threaded portions, and fixing members (nuts) 283 are screwed into the male threaded portions.
  • the end plate 28 is sandwiched and fixed between the fixing member 283 and the rotor core 24 .
  • the end plates 28 are screwed and fixed to both ends of the shaft 21 by fixing members 283 (nuts).
  • the fixing member 283 contacts the flat surface of the end plate 28 . Therefore, a large contact area can be secured between the fixing member 283 and the end plate 28, and the end plate 28 can be pressed against the rotor core 24 with a greater force.
  • the fixing member 283 is a nut has been described, but the fixing member 283 may be a ring-shaped collar member that is press-fitted onto the shaft 21 .
  • one end plate 28 covers the end face on one axial side (+Y side) of the rotor core 24 .
  • One end plate 28 has a first surface 28a facing one axial side (+Y side).
  • the first surface 28a inclines toward the other axial side (-Y) as it extends radially outward.
  • the first surface 28a is a curved surface that is convex toward one axial direction side (+Y side).
  • the first surface 28a has a constant shape over the entire circumference of the center axis J2. That is, the first surface 28a has the same shape in any cross section passing through the central axis J2.
  • One of the objects of the present embodiment is to provide a driving device in which the driving efficiency of the motor is improved by reducing the air resistance during rotation of the rotor.
  • the first surface 28a into a smoothly curved surface, it is possible to reduce the air resistance in the end plate 28 when the rotor 20 rotates at high speed. Thereby, the drive efficiency of the drive device 1 can be improved. Furthermore, when the rotor 20 rotates at a high speed, the rotor 20 can be stably rotated, so that the generation of wind noise and whirling of the rotor 20 can be suppressed, and the quietness of the drive device 1 can be improved.
  • the other end plate 28 positioned on the other side (-Y side) in the axial direction has a shape that is the opposite of the one end plate 28 in the axial direction.
  • the shape of the other end plate 28 located on the other side ( ⁇ Y side) in the axial direction is the same as the shape of the one end plate 28, but the arrangement direction is different. That is, the other end plate 28 covers the end surface of the rotor core 24 on the other axial side ( ⁇ Y side).
  • the other end plate 28 has a second surface 28f facing the other axial side (-Y side).
  • the second surface 28f inclines toward the axial one side (+Y) as it extends radially outward.
  • the second surface 28f is a curved surface that is convex toward the other axial direction side (-Y side).
  • the second surface 28f has a constant shape over the entire circumference of the center axis J2.
  • a first projecting portion 281 and a second projecting portion 282 projecting toward the rotor core 24 are provided on the surface of the end plate 28 facing the rotor core 24 side. That is, the end plate 28 has protruding portions 281 and 282 that protrude toward the rotor core 24 side from the surface facing the rotor core 24 side. As shown in FIG. 5, the first protrusion 281 and the second protrusion 282 each extend in the circumferential direction. Preferably, the first protrusion 281 and the second protrusion 282 are each substantially annular. The first projecting portion 281 is positioned radially outward of the second projecting portion 282 . The axial length of the first protrusion 281 is shorter than the axial length of the second protrusion 282 .
  • the inner peripheral surface (the surface facing radially inward) of the second projecting portion 282 continues to the through hole 28 h of the end plate 28 . At least part of the inner peripheral surface of the second projecting portion 282 contacts the outer surface (the surface facing radially outward) of the shaft 21 . Thereby, the end plate 28 is positioned with respect to the central axis J2. The tip of the second projecting portion 282 contacts the axially facing surface of the rotor core 24 . Thereby, the rotor core 24 can be stably fixed to the shaft 21 via the end plate 28 .
  • the rotor 20 of the present embodiment when the rotation balance of the rotor 20 is poor, by partially changing the protrusion height of the first protrusion 281 by cutting the first protrusion 281, A balance correction of the rotor 20 can be made. As a result, rotational vibration around the central axis J2 that occurs when the rotor 20 rotates can be suppressed. Further, according to the end plate 28 of this embodiment, the first projecting portion 281 is not exposed on the outer surface of the rotor 20 . Therefore, even if the shape of a part of the first projecting portion 281 in the circumferential direction differs from the shape of the other portion in the circumferential direction due to the balance correction, the air flow during the rotation of the rotor 20 does not change. An increase in resistance can be suppressed.
  • the stator 30 includes an annular stator core 32 centered on the central axis J2, coils 31 attached to the stator core 32, a cover member 324, and an insulator interposed between the stator core 32 and the coils 31. (not shown). Stator 30 is held in housing 6 .
  • the stator core 32 has an annular yoke and a plurality of magnetic pole teeth protruding radially inward from the inner peripheral surface of the yoke.
  • a slot 322 into which the coil 31 is inserted is located between the magnetic pole teeth.
  • the coil wire 31e inserted into the slot 322 is a so-called rectangular wire.
  • a resin member 323 is inserted inside the slot 322 in the radial direction of the coil wire 31e.
  • the resin member may be a separate member or may be made of varnish or the like.
  • the coil 31 has a first coil end 31a and a second coil end 31b.
  • the first coil end 31a protrudes to the other side of the stator core 32 in the axial direction.
  • the second coil end 31b protrudes to one side of the stator core 32 in the axial direction. That is, the coil 31 has coil ends 31a and 31b that protrude from the stator core 32 in the axial direction.
  • the coil ends 31a and 31b are ring-shaped around the central axis J2.
  • the cover member 324 is an annular member extending in the circumferential direction.
  • the cover members 324 are arranged on both the axial one side and the other axial side of the stator core 32 .
  • one cover member 324 covers the first coil end 31a
  • the other cover member 324 covers the second coil end 31b.
  • the cover member 324 is fixed to the axially facing surface of the stator core 32 by screwing, bonding, or the like. Thereby, the cover member 324 is attached to the stator core 32 .
  • the cover member 324 has an inner wall 324a, an outer wall 324c and a lid portion 324b.
  • the inner wall 324a is located radially inside the coil ends 31a and 31b.
  • the inner wall 324a has a substantially cylindrical shape centered on the central axis J2.
  • the inner wall 324a covers the coil ends 31a and 31b from the inside in the radial direction.
  • the outer wall 324c is located radially outside the coil ends 31a and 31b.
  • the outer wall 324c has a substantially cylindrical shape centered on the central axis J2.
  • the outer wall 324c covers the coil ends 31a and 31b from the radial outside.
  • the outer wall 324c radially faces the inner wall 324a.
  • Coil ends 31a and 31b are arranged between the outer wall 324c and the inner wall 324a.
  • the lid portion 324b connects the inner wall 324a and the outer wall 324c.
  • the lid portion 324b has a substantially plate shape orthogonal to the axial direction.
  • the lid portion 324b axially covers the coil ends 31a and 31b.
  • the lid portion 324b is arranged to face the surface of the stator core 32 facing the axial direction.
  • a space surrounded by the cover member 324 and the stator core 32 constitutes a coil end accommodation space A that accommodates the coil ends 31a and 31b.
  • the coil end accommodation space A is surrounded by the inner wall 324a, the lid portion 324b, the outer wall 324c, and the surfaces of the stator core 32 facing the axial direction.
  • the coil end accommodation space A extends in a substantially annular shape in the circumferential direction around the center axis J2.
  • a pair of cover members 324 are provided on the stator 30 of the present embodiment. Therefore, the coil end accommodation spaces A are provided on one side and the other side of the stator core 32 in the axial direction.
  • a first coil end 31a is accommodated in one of the coil end accommodation spaces A located on one side in the axial direction of the pair of coil end accommodation spaces A, and the other coil end accommodation space A located on the other side in the axial direction. accommodates the second coil end 31b.
  • fluid O circulates through channels 90 and 100 .
  • the fluid O is used for lubricating the first bearing 26 and the second bearing 27 .
  • the fluid O is used for cooling the motor 2 .
  • Fluid O accumulates in tank 99 . Since the fluid O functions as a lubricating oil and a cooling oil, it is preferable to use a low-viscosity lubricating oil equivalent to automatic transmission fluid (ATF).
  • ATF automatic transmission fluid
  • the fluid O accumulates in a lower region, that is, a fluid pool P, inside the gear chamber 82, which will be described later.
  • the flow paths 90 and 100 are paths of the fluid O that supply the fluid O from the tank 99 to the motor 2 and lead it to the tank 99 again.
  • Channels 90 , 100 include an internal channel 90 provided in housing 6 and an external channel 100 provided outside housing 6 .
  • a part of the internal flow path 90 is provided inside the wall of the member that constitutes the housing 6 .
  • Another part of the internal flow path 90 is provided inside the accommodation space 80 .
  • the external channel 100 is provided outside the housing space 80 .
  • the external flow path 100 may be provided, for example, in a gear housing (not shown) that accommodates a gear portion (not shown), or may be a hose or pipe.
  • the term “flow path” is a concept that means the route of the fluid O. Therefore, the term “flow path” includes not only a “flow path” in which the fluid O flows steadily in one direction, but also a path for temporarily retaining the fluid O (for example, a reservoir) and a path through which the fluid O drips. It is a concept.
  • the internal flow path 90 has a first flow path 91 provided inside the wall of the housing 6 of the motor 2 and a second flow path 92 provided inside the housing space 80 .
  • the first flow path 91 and the second flow path 92 are connected in the order of the second flow path 92 and the first flow path 91 and configured as a flow path through which the fluid O flows within the motor 2 .
  • the fluid O cools the motor 2 internally and externally in the first flow path 91 and the second flow path 92 .
  • the second flow path 92 has a pair of coil end housing spaces A and a core through hole 321 provided in the stator core 32 . That is, the pair of coil end accommodation spaces A constitute a part of the second flow path 92 .
  • Core through hole 321 extends axially through stator core 32 .
  • the core through hole 321 connects a pair of coil end accommodation spaces A arranged on both sides in the axial direction with respect to the stator core.
  • the supply port 952 of the external channel 100 is connected to the lid portion 324b of the cover member 324 . That is, the coil end accommodation space A is connected to the supply port 952 .
  • the fluid O sucked out from the tank 99 of the external channel 100 by the pump 96 is discharged from the supply port 952 and supplied to one coil end accommodation space A of the second channel 92 .
  • the fluid O flowing through one coil end housing space A contacts the first coil end 31a and cools the first coil end 31a.
  • the fluid O that has cooled the first coil end 31a moves in the axial direction through the core through hole 321 that axially penetrates the stator core 32, reaches the coil end accommodation space A arranged on the opposite side in the axial direction, and reaches the first coil end. 2 coil end 31b is cooled. Further, the fluid O cools the stator core 32 when passing through the core through-holes 321 .
  • the fluid O that has cooled the second coil end 31b is supplied to the first flow path 91 formed in the housing 6 through the flow path provided in the axial direction.
  • the fluid O in the first flow path 91 branches into the +Z direction and the -Z direction, respectively.
  • the fluid O branched in the -Z direction is supplied to the second bearing 27 .
  • the fluid O branched in the +Z direction inside the wall of the housing 6 is further branched in the +Y direction and the -Y direction.
  • the fluid O branched in the -Y direction is supplied to the hollow portion 22 provided in the shaft 21 and can cool the shaft 21 and the rotor core 24 .
  • the fluid O that cools the shaft 21 and the rotor core 24 accumulates in the fluid reservoir P.
  • the fluid O branched in the +Y direction inside the wall of the housing 6 passes through the stator core 32 (that is, the motor 2 ) to cool the motor 2 .
  • a portion of the fluid O is also supplied to the first bearing 26 . That is, the fluid O flowing through the first flow path 91 cools the stator core 32 and lubricates the first bearing 26 and the second bearing 27 .
  • Fluid O accumulates in fluid pool P after flowing through stator core 32 , first bearing 26 , and second bearing 27 .
  • the driving device 1 includes the first flow path 91 through which the fluid O flows.
  • the first channel 91 has an axial channel portion 912 and a plurality of radial channel portions 911 .
  • the axial channel portion 912 extends axially inside the wall of the tubular portion 61 .
  • the radial channel portion 911 extends radially inside the wall of the cylindrical portion 61 .
  • the radial channel portion 911 extends radially inward from the axial channel portion 912 .
  • the radial flow path portion 911 opens toward the stator 30 .
  • the fluid O can flow from the radial flow path portion 911 to the portion of the stator 30 where the amount of heat generated is high. It is possible to inject directly. According to the present embodiment, it is possible to intensively cool a portion of the stator 30 that tends to become hot and requires cooling, so that the stator 30 can be efficiently cooled. Further, the radial flow path portion 911 of this embodiment extends radially outward from the axial flow path portion 912 .
  • the cylindrical portion 61 of the present embodiment is provided with a plurality of radial flow passage portions 911 aligned in the axial direction. Therefore, the fluid O can be supplied to a plurality of locations in the axial direction of the stator 30, and the stator 30 can be cooled more uniformly.
  • the radial flow path portion 911 of the present embodiment opens toward the outer peripheral surface of the stator core 32 .
  • the first flow path 91 can jet the fluid O from the radial flow path portion 911 to the stator core 32 to efficiently cool the stator core 32 .
  • the pump 96 is an electrically driven pump.
  • the fluid O accumulated in the fluid pool P is sucked up by the pump 96 and supplied to the tank 99 .
  • the pump 96 may be of another type, such as a mechanically driven type.
  • a cooling water pipe (not shown) for passing cooling water cooled by a radiator (not shown) is connected to the cooler 97 .
  • the fluid O passing through the cooler 97 is cooled by heat exchange with the cooling water passing through the cooling water pipe.
  • An inverter unit (not shown) is provided in the path of the cooling water pipe. Cooling water passing through the cooling water pipe cools an inverter unit (not shown).
  • the rotor 20 and the stator 30 can be efficiently cooled by the fluid O immediately after passing through the cooler 97, and the first bearing 26 and the second bearing 27 can be lubricated.
  • Cooler 97 , pump 96 and tank 99 may be fixed to housing 6 .
  • the drive device 110 of 2nd Embodiment has a speed reducer 3 in addition to the motor 2 .
  • the reduction gear 3 corresponds to the gear portion (not shown) of the first embodiment.
  • a gear chamber 82 is attached to the other axial side of the housing 6 via a partition wall.
  • the reduction gear 3 is housed inside the gear chamber 82 .
  • the shaft 21 is connected to the reduction gear 3 .
  • the driving device 110 of the present embodiment cools the motor 2 and lubricates the bearings by pumping up the fluid O in the gear chamber 82 housing the speed reduction device 3 .
  • a driving device 110B of 3rd Embodiment differs from that of the first embodiment in the configuration of an internal flow path 90B.
  • symbol is attached
  • the internal channel 90B of this embodiment has a channel 91B.
  • the channel 91B is a channel corresponding to the first channel 91 (see FIG. 1) of the first embodiment, and the fluid O flows therethrough.
  • the channel 91B has an axial channel portion 912 and a plurality of radial channel portions 911 and 911B.
  • the plurality of radial flow passage portions 911 and 911B of the present embodiment includes a plurality of first radial flow passage portions 911 and a plurality of second radial flow passage portions 911B.
  • the axial channel portion 912 extends axially inside the wall of the tubular portion 61 of the housing 6 .
  • the first radial flow path portion 911 and the second radial flow path portion 911B extend radially inside the wall of the cylindrical portion 61 .
  • the first radial flow path portion 911 and the second radial flow path portion 911B extend radially inward from the axial flow path portion 912 .
  • the first radial flow path portion 911 and the second radial flow path portion 911B open toward the stator 30 .
  • the plurality of first radial flow passage portions 911 are arranged side by side along the axial direction.
  • the plurality of first radial flow passage portions 911 open toward the outer peripheral surface of the stator core 32 .
  • the first radial flow path portion 911 jets the fluid O toward the outer peripheral surface of the stator core 32 .
  • the fluid O injected from the first radial flow path portion 911 cools the stator core 32 .
  • the second radial flow path portion 911B opens toward the coil ends 31a and 31b.
  • a pair of second radial flow path portions 911B are provided in the flow path 91B of the present embodiment.
  • One of the openings of the pair of second radial flow path portions 911B located on one axial side (+Y side) faces the first coil end 31a in the radial direction.
  • the other opening of the pair of second radial flow passage portions 911B located on the other axial side ( ⁇ Y side) faces the second coil end 31b in the radial direction.
  • the pair of second radial flow path portions 911B jet the fluid O toward the coil ends 31a and 31b.
  • the fluid O ejected from the second radial flow path portion 911B cools the coil ends 31a and 31b.
  • stator 30 coil 31 generates a large amount of heat compared to other parts of stator 30 .
  • stator 30 it is possible to directly inject the fluid O to the coil 31, which tends to reach a relatively high temperature, so that the stator 30 can be efficiently cooled.
  • the stator 30 of this embodiment has a cover member 324 as in the first embodiment.
  • Cover member 324 and stator core 32 surround coil end accommodation space A.
  • the outer wall 324c of the cover member 324 is provided with a through hole 324h that radially penetrates the outer wall 324c.
  • the second radial flow path portion 911B supplies the fluid O to the coil end accommodation space A via the through hole 324h.
  • the stator 30 has a cover member 324 that covers the coil ends 31a and 31b.
  • the cover member 324 prevents the fluid O, which is jetted from the second radial flow path portion 911B to the coil ends 31a and 31b and reflected by the coil ends 31a and 31b, from scattering and flowing out in all directions.
  • the cover member 324 keeps the fluid O, which is about to scatter and flow out, around the coil ends 31a and 31b.
  • the fluid O contacts the coil ends 31a and 31b again, and the contact time between the fluid O and the coil ends 31a and 31b can be lengthened.
  • the fluid O can take more heat from the coil 31, and the coil 31 can be efficiently cooled.
  • the cover member 324 has an inner wall 324a that covers the coil ends 31a and 31b from the inside in the radial direction, and a lid portion 324b that covers the coil ends 31a and 31b from the axial direction. According to the present embodiment, it is possible to prevent the fluid O jetted radially inward from the second radial flow path portion 911B from scattering radially inward and axially. Furthermore, according to the present embodiment, the surfaces of the inner wall 324a, the lid portion 324b, and the stator core 32 facing the axial direction are arranged in a gutter shape that opens radially outward.
  • the fluid O supplied from the second radial flow path portion 911B flows along the coil ends 31a and 31b. can flow in the circumferential direction.
  • the fluid O can be supplied to the entire coil ends 31a and 31b extending in the circumferential direction, and the coil ends 31a and 31b can be uniformly cooled along the circumferential direction.
  • the inner wall 324a of the present embodiment is arranged between the coil ends 31a, 31b and the rotor 20. Therefore, the inner wall 324a suppresses the rotor 20 from being supplied with the fluid O from the second radial flow path portion 911B toward the coil ends 31a and 31b.
  • the fluid O may act as resistance to the rotation of the rotor 20 .
  • the cover member 324 has an outer wall 324c that radially covers the coil ends 31a and 31b in addition to the inner wall 324a and the lid portion 324b.
  • the fluid O can fill the coil end accommodation space A surrounded by the cover member 324 and the stator core 32 .
  • the time during which the fluid O contacts the coil ends 31a and 31b can be made longer, and the coil 31 can be efficiently cooled.
  • a motor having a rotor that rotates around a central axis and a stator that is positioned radially outward of the rotor, a housing provided with a housing space that houses the motor, and a flow path through which a fluid flows.
  • the housing has a cylindrical portion that surrounds the stator from the outside in the radial direction, and the flow path includes an axial flow path portion that extends axially within a wall of the cylindrical portion, and the axial flow path portion. a radial passage portion extending radially inwardly from and opening toward the stator.
  • the stator has an annular stator core centered on the central axis and coils attached to the stator core, and the radial flow path portion opens toward the outer peripheral surface of the stator core.
  • the stator has an annular stator core centered on the central axis, and a coil attached to the stator core, the coil has a coil end projecting axially from the stator core, and the The driving device according to (1), wherein the radial flow path portion opens toward the coil end.
  • the stator has a cover member that covers the coil ends.
  • the coil end has an annular shape centered on the central axis
  • the cover member has an inner wall that radially inwardly covers the coil end, and a cover that axially covers the coil end.
  • (6) The driving device according to (5), wherein the cover member has an outer wall that covers the coil end from the radial outside.
  • a motor having a rotor that rotates about a central axis and a stator that is positioned radially outward of the rotor.
  • the rotor includes a cylindrical rotor core that extends axially about the central axis; and an end plate covering one end surface in the axial direction of the end plate, the surface of the end plate facing the one axial side is inclined toward the other axial side as it extends radially outward, and A driving device that is a curved surface that is convex toward one side.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

A drive device according to one aspect of the present invention comprises a motor having a rotor that rotates about a central axis and a stator located on the radially outer side of the rotor, a housing having an accommodation space for accommodating the motor, and a flow path through which fluid passes. The housing has a tubular portion surrounding the radially outer side of the stator, and the flow path has an axial flow path portion extending through the inside of the wall of the tubular portion in the axial direction and a radial flow path portion extending from the axial flow path portion toward the radially inner side and opening toward the stator.

Description

駆動装置drive
　本発明は、電気自動車やハイブリッド自動車に使用される駆動装置に関する。
　本願は、２０２２年２月３日に、日本に出願された特願２０２２－０１５８９０号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a drive system used in electric vehicles and hybrid vehicles.
This application claims priority based on Japanese Patent Application No. 2022-015890 filed in Japan on February 3, 2022, the content of which is incorporated herein.
　モータは、駆動時に発熱するため、従来から冷却構造を備える駆動装置が周知である。特許文献１には、ステータコアの径方向外側に位置する冷媒流入口からステータに冷媒を供給してステータを冷却する電動機が開示されている。 Since the motor generates heat when it is driven, a drive device with a cooling structure has been well known. Patent Literature 1 discloses an electric motor that cools the stator by supplying a coolant to the stator from a coolant inlet located radially outside of the stator core.
特開２０１６－７３１６３号公報JP 2016-73163 A
　特許文献１の電動機では、オイルはステータコアの表面を伝ってステータの各部に供給される。このため、従来技術の電動機では、ステータ各部の発熱量に応じたオイルの供給ができず、ステータが局所的に高温になる虞がある。 In the electric motor of Patent Document 1, oil is supplied to each part of the stator along the surface of the stator core. For this reason, in the conventional electric motor, the oil cannot be supplied in accordance with the amount of heat generated in each part of the stator, and there is a possibility that the temperature of the stator may become locally high.
　本発明の一つの態様は、ステータを効率的に冷却できる駆動装置の提供を目的の一つとする。 An object of one aspect of the present invention is to provide a driving device that can efficiently cool the stator.
　本発明の駆動装置の一つの態様は、中心軸線を中心として回転するロータ、および前記ロータの径方向外側に位置するステータを有するモータと、前記モータを収容する収容空間が設けられるハウジングと、流体が流れる流路と、を備え、前記ハウジングは、前記ステータを径方向外側から囲む筒状部を有し、前記流路は、前記筒状部の壁内部を軸方向に延びる軸方向流路部と、前記軸方向流路部から径方向内側に延びて前記ステータに向けて開口する径方向流路部と、を有する。 One aspect of the drive device of the present invention includes a motor having a rotor that rotates about a central axis and a stator that is positioned radially outward of the rotor, a housing provided with a housing space for housing the motor, a fluid the housing has a cylindrical portion that radially surrounds the stator, and the flow channel extends axially through a wall of the cylindrical portion. and a radial flow path extending radially inward from the axial flow path and opening toward the stator.
　本発明の一つの態様によれば、ステータを効率的に冷却できる駆動装置が提供される。 According to one aspect of the present invention, a driving device is provided that can efficiently cool the stator.
図１は、第１実施形態の駆動装置の概念図である。FIG. 1 is a conceptual diagram of the driving device of the first embodiment. 図２は、第１実施形態のモータの断面図である。FIG. 2 is a cross-sectional view of the motor of the first embodiment. 図３は、第１実施形態のステータの拡大断面図である。FIG. 3 is an enlarged cross-sectional view of the stator of the first embodiment. 図４は、第１実施形態のロータの斜視図である。FIG. 4 is a perspective view of the rotor of the first embodiment. 図５は、第１実施形態のエンドプレートの背面図である。5 is a rear view of the end plate of the first embodiment. FIG. 図６は、第２実施形態の駆動装置の概念図である。FIG. 6 is a conceptual diagram of the driving device of the second embodiment. 図７は、第３実施形態の駆動装置の概念図である。FIG. 7 is a conceptual diagram of the driving device of the third embodiment.
＜第１実施形態＞
　以下、図面を参照しながら、本発明の第１実施形態に係る駆動装置１について説明する。なお、本発明の範囲は、以下の実施の形態に限定されず、本発明の技術的思想の範囲内で任意に変更可能である。 <First embodiment>
A driving device 1 according to a first embodiment of the present invention will be described below with reference to the drawings. It should be noted that the scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention.
　以下の説明では、駆動装置１が水平な路面上に位置する車両に搭載された場合の位置関係を基に、重力方向を規定して説明する。また、図面においては、適宜３次元直交座標系としてＸＹＺ座標系を示す。ＸＹＺ座標系において、Ｚ軸方向は、鉛直方向（すなわち上下方向）を示し、＋Ｚ方向が上側（重力方向の反対側）であり、－Ｚ方向が下側（重力方向）である。また、Ｘ軸方向は、Ｚ軸方向と直交する方向であって駆動装置１が搭載される車両の前後方向を示す。本実施形態において、＋Ｘ側は、車両の前側であり、－Ｘ側は、車両の後側である。Ｙ軸方向は、Ｘ軸方向とＺ軸方向との両方と直交する方向であって、車両の幅方向（左右方向）を示す。本実施形態において、＋Ｙ側は、車両の左側であり、－Ｙ側は、車両の右側である。なお、前後方向の位置関係は、本実施形態の位置関係に限られず、＋Ｘ側が車両の後側であり、－Ｘ側が車両の前側であってもよい。この場合には、＋Ｙ側は、車両の右側であり、－Ｙ側は、車両の左側である。 In the following description, the direction of gravity will be defined based on the positional relationship when the driving device 1 is mounted on a vehicle positioned on a horizontal road surface. Also, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction indicates the vertical direction (that is, the vertical direction), the +Z direction is the upper side (the side opposite to the direction of gravity), and the −Z direction is the lower side (the direction of gravity). Further, the X-axis direction is a direction perpendicular to the Z-axis direction and indicates the front-rear direction of the vehicle in which the driving device 1 is mounted. In this embodiment, the +X side is the front side of the vehicle, and the -X side is the rear side of the vehicle. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and indicates the width direction (horizontal direction) of the vehicle. In this embodiment, the +Y side is the left side of the vehicle and the -Y side is the right side of the vehicle. The positional relationship in the longitudinal direction is not limited to the positional relationship of this embodiment, and the +X side may be the rear side of the vehicle and the −X side may be the front side of the vehicle. In this case, the +Y side is the right side of the vehicle and the -Y side is the left side of the vehicle.
　以下の説明において特に断りのない限り、モータ２の中心軸線Ｊ２に平行な方向（Ｙ軸方向）を単に「軸方向」と呼び、中心軸線Ｊ２を中心とする径方向を単に「径方向」と呼び、中心軸線Ｊ２を中心とする周方向、すなわち、中心軸線Ｊ２の軸周りを単に「周方向」と呼ぶ。 In the following description, unless otherwise specified, the direction parallel to the central axis J2 of the motor 2 (Y-axis direction) is simply referred to as the "axial direction," and the radial direction about the central axis J2 is simply referred to as the "radial direction." The circumferential direction centered on the central axis J2, that is, the circumference of the central axis J2 is simply called the "circumferential direction".
　また、本明細書において、所定の方向（又は平面）に「沿って延びる」とは、厳密に所定の方向に延びる場合に加えて、厳密な方向に対して、４５°未満の範囲で傾いた方向に延びる場合も含む。 In addition, in this specification, “extending along” a predetermined direction (or plane) means extending in a strictly predetermined direction, as well as a It includes the case where it extends in the direction.
＜第１実施形態＞
　以下、第１実施形態に係る駆動装置１について説明する。本実施形態の駆動装置１は、ハイブリッド自動車（ＨＥＶ）、プラグインハイブリッド自動車（ＰＨＶ）、電気自動車（ＥＶ）等、モータを動力源とする車両に搭載され、その動力源として使用される。 <First embodiment>
The driving device 1 according to the first embodiment will be described below. The drive device 1 of the present embodiment is mounted on a vehicle using a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), and is used as the power source.
　図１に示すように、駆動装置１は、モータ２と、ハウジング６と、ハウジング６内を循環する流体Ｏと、流体Ｏが流れる流路９０、１００と、ポンプ９６と、クーラー９７、タンク９９を備える。また、駆動装置１は、図示しないギヤ部を有する。ギヤ部は、モータ２のシャフト２１に接続され、モータ２によって駆動させられる複数のギヤを有する。ギヤ部は、モータ２の出力を減速して車両の車輪に伝える。本実施形態では、軸方向のうち、モータ２からギヤ部へ向かう方向を軸方向一方側（＋Ｙ側）と呼び、ギヤ部からモータ２へ向かう方向を軸方向他方側（－Ｙ側）と呼ぶ。 As shown in FIG. 1, the driving device 1 includes a motor 2, a housing 6, a fluid O circulating in the housing 6, channels 90 and 100 through which the fluid O flows, a pump 96, a cooler 97, a tank 99, and a Prepare. Further, the driving device 1 has a gear portion (not shown). The gear section has a plurality of gears connected to the shaft 21 of the motor 2 and driven by the motor 2 . The gear section decelerates the output of the motor 2 and transmits it to the wheels of the vehicle. In this embodiment, of the axial directions, the direction from the motor 2 to the gear portion is called the one axial direction side (+Y side), and the direction from the gear portion to the motor 2 is called the other axial direction side (−Y side). .
　＜ハウジング＞
　ハウジング６の内部には、モータ２を収容する収容空間８０が設けられる。つまり収容空間８０には、モータ２が収容される。ハウジング６は、収容空間８０においてモータ２を保持する。モータ２は、ハウジング６に対し、図示略のボルト等で固定されていてもよく、焼き嵌めや挿入等で固定されていてもよい。 <Housing>
A housing space 80 for housing the motor 2 is provided inside the housing 6 . That is, the motor 2 is accommodated in the accommodation space 80 . The housing 6 holds the motor 2 in the accommodation space 80 . The motor 2 may be fixed to the housing 6 with bolts (not shown) or the like, or may be fixed by shrink fitting, insertion, or the like.
　収容空間８０内の下部領域には、流体Ｏが溜る流体溜りＰが設けられる。収容空間８０の下部領域に溜った流体Ｏは、後述するポンプ９６により流体溜りＰから流体Ｏをタンク９９に移動させる。 A fluid reservoir P in which the fluid O is accumulated is provided in the lower region within the housing space 80 . The fluid O accumulated in the lower region of the accommodation space 80 is moved from the fluid reservoir P to the tank 99 by the pump 96 described later.
　ハウジング６は、筒状部６１と、第２ハウジング部６２と、第３ハウジング部６３と、を有する。筒状部６１は、中心軸線Ｊ２を中心とする筒状である。筒状部６１は、モータ２のステータ３０を径方向外側から囲む。第２ハウジング部６２は、筒状部６１の軸方向一方側（＋Ｙ側）の開口を覆う。第３ハウジング部６３は、筒状部６１の軸方向他方側（－Ｙ側）の開口を覆う。 The housing 6 has a tubular portion 61 , a second housing portion 62 and a third housing portion 63 . The cylindrical portion 61 has a cylindrical shape centered on the central axis J2. The cylindrical portion 61 surrounds the stator 30 of the motor 2 from the outside in the radial direction. The second housing portion 62 covers the opening on one axial side (+Y side) of the cylindrical portion 61 . The third housing portion 63 covers the opening of the cylindrical portion 61 on the other axial side (−Y side).
　ハウジング６は、外周面に複数のリブを有している。ハウジング６は、後述するモータ２の水平方向に延びる中心軸線Ｊ２と平行な、つまり水平の第１のリブと、中心軸線Ｊ２の周方向に延びる第２のリブを有している。これにより、モータ２の回転により生じる振動と音がハウジング６により増幅することを抑制することができる。 The housing 6 has a plurality of ribs on its outer peripheral surface. The housing 6 has a horizontal first rib parallel to the horizontally extending central axis J2 of the motor 2, which will be described later, and a second rib extending in the circumferential direction of the central axis J2. As a result, it is possible to suppress amplification of the vibration and sound caused by the rotation of the motor 2 by the housing 6 .
　＜モータ＞
　モータ２は、ハウジング６の収容空間８０に収容される。モータ２は、水平方向に延びる中心軸線Ｊ２を中心として回転するロータ２０と、ロータ２０の径方向外側に位置するステータ３０と、ロータ２０を回転可能に支持する一対のベアリング（第１のベアリング２６および第２のベアリング２７）と、を備える。本実施形態のモータ２は、インナーロータ型モータである。 <Motor>
The motor 2 is housed in the housing space 80 of the housing 6 . The motor 2 includes a rotor 20 that rotates about a central axis J2 extending in the horizontal direction, a stator 30 positioned radially outside the rotor 20, and a pair of bearings (first bearings 26) that rotatably support the rotor 20. and a second bearing 27). The motor 2 of this embodiment is an inner rotor type motor.
　ロータ２０は、図示略のバッテリおよびインバータユニットを介してステータ３０に交流電流が供給されることで回転する。ロータ２０は、シャフト２１と、ロータコア２４と、複数のロータマグネット２５と、一対のエンドプレート２８と、を有する。ロータ２０（すなわち、シャフト２１、ロータコア２４およびロータマグネット２５）は、水平方向かつ車両の幅方向に延びる中心軸線Ｊ２を中心として回転する。 The rotor 20 rotates when AC current is supplied to the stator 30 via a battery and an inverter unit (not shown). The rotor 20 has a shaft 21 , a rotor core 24 , a plurality of rotor magnets 25 and a pair of end plates 28 . Rotor 20 (that is, shaft 21, rotor core 24, and rotor magnet 25) rotates about a central axis J2 extending horizontally and in the width direction of the vehicle.
　シャフト２１は、中心軸線Ｊ２を中心として軸方向に延びる。シャフト２１は、中心軸線Ｊ２を中心として回転する。シャフト２１は、内部に軸方向に延びる空洞である中空部２２を有する中空シャフトである。つまり中空部２２は、シャフト２１内に位置し軸方向に延びる。中空部２２はいわゆる二重円筒になっている。 The shaft 21 extends axially around the central axis J2. The shaft 21 rotates about the central axis J2. The shaft 21 is a hollow shaft having a hollow portion 22 therein which is an axially extending cavity. That is, the hollow portion 22 is positioned within the shaft 21 and extends in the axial direction. The hollow portion 22 is a so-called double cylinder.
　シャフト２１の一方の端部、つまり軸方向一方側の端部は、ハウジング６外部に突出し、図示しないギヤ部に連結される。 One end of the shaft 21, that is, one end in the axial direction, protrudes outside the housing 6 and is connected to a gear (not shown).
　シャフト２１は、一対のベアリング（第１のベアリング２６および第２のベアリング２７）により回転可能に支持される。第１のベアリング２６および第２のベアリング２７は、収容空間８０に位置する。また、第１のベアリング２６および第２のベアリング２７は、ロータコア２４を挟んでシャフト２１の軸方向両側にそれぞれ回転可能に支持する。第１のベアリング２６および第２のベアリング２７は、ハウジング６に保持される。より具体的には、第１のベアリング２６は第２ハウジング部６２に保持され、第２のベアリング２７は第３ハウジング部６３に保持される。 The shaft 21 is rotatably supported by a pair of bearings (first bearing 26 and second bearing 27). The first bearing 26 and the second bearing 27 are located in the accommodation space 80 . A first bearing 26 and a second bearing 27 are rotatably supported on both axial sides of the shaft 21 with the rotor core 24 interposed therebetween. A first bearing 26 and a second bearing 27 are held in the housing 6 . More specifically, the first bearing 26 is held in the second housing portion 62 and the second bearing 27 is held in the third housing portion 63 .
　ロータコア２４は、珪素鋼板を積層して構成される。ロータコア２４は、中心軸線Ｊ２を中心として軸方向に延びる略円柱体である。図２に示すように、ロータコア２４には、ロータマグネット２５が収容される複数の保持孔２４ｈが設けられる。ロータマグネット２５は、保持孔２４ｈの内側面に固定される。これにより、ロータマグネット２５は、ロータコア２４に固定される。複数のロータマグネット２５は、磁極を交互にして周方向に沿って並ぶ。 The rotor core 24 is constructed by laminating silicon steel plates. The rotor core 24 is a substantially cylindrical body extending axially about the center axis J2. As shown in FIG. 2, the rotor core 24 is provided with a plurality of holding holes 24h in which the rotor magnets 25 are accommodated. The rotor magnet 25 is fixed to the inner surface of the holding hole 24h. Thereby, the rotor magnet 25 is fixed to the rotor core 24 . A plurality of rotor magnets 25 are arranged along the circumferential direction with magnetic poles alternated.
　図１に示すように、一対のエンドプレート２８は、それぞれロータコア２４の軸方向両端に配置される。各エンドプレートは、ロータコア２４の軸方向端面を覆う。エンドプレート２８は、ロータコア２４の端面に開口する保持孔２４ｈを覆う。これにより、エンドプレート２８は、保持孔２４ｈ内に収容されるロータマグネット２５が保持孔２４ｈから抜け出ることを抑制する。 As shown in FIG. 1, the pair of end plates 28 are arranged at both ends of the rotor core 24 in the axial direction. Each end plate covers the axial end face of the rotor core 24 . The end plate 28 covers the holding hole 24h that opens in the end face of the rotor core 24. As shown in FIG. As a result, the end plate 28 prevents the rotor magnet 25 accommodated in the holding hole 24h from slipping out of the holding hole 24h.
　各エンドプレート２８の形状は、ロータコア２４の軸方向端面とは反対側に凸となる湾曲部を有するお椀形状である。また、エンドプレート２８の略中央には貫通孔２８ｈが設けられる。貫通孔２８ｈには、シャフト２１が通される。エンドプレート２８は、ロータコア２４の反対側を向く面の貫通孔２８ｈの開口部の近傍に平らな面を有する。シャフト２１の両端部にはオネジ部が設けられており、当該オネジ部には固定部材（ナット）２８３が締め込まれる。エンドプレート２８は、固定部材２８３とロータコア２４との間に挟み込まれて固定される。すなわち、エンドプレート２８は固定部材２８３（ナット）により、シャフト２１の両端にねじ止め固定される。固定部材２８３は、エンドプレート２８の上述の平らな面と接する。そのため、固定部材２８３とエンドプレート２８との接触面積を広く確保することができ、エンドプレート２８を、ロータコア２４に対して、より大きな力で押圧することができる。なお、本実施形態では、固定部材２８３がナットである場合について説明したが、固定部材２８３は、シャフト２１に圧入されるリング状のカラー部材であってもよい。 The shape of each end plate 28 is a bowl shape having a curved portion that is convex on the side opposite to the end face in the axial direction of the rotor core 24 . A through-hole 28 h is provided in substantially the center of the end plate 28 . The shaft 21 is passed through the through hole 28h. The end plate 28 has a flat surface near the opening of the through hole 28h on the surface facing away from the rotor core 24. As shown in FIG. Both ends of the shaft 21 are provided with male threaded portions, and fixing members (nuts) 283 are screwed into the male threaded portions. The end plate 28 is sandwiched and fixed between the fixing member 283 and the rotor core 24 . That is, the end plates 28 are screwed and fixed to both ends of the shaft 21 by fixing members 283 (nuts). The fixing member 283 contacts the flat surface of the end plate 28 . Therefore, a large contact area can be secured between the fixing member 283 and the end plate 28, and the end plate 28 can be pressed against the rotor core 24 with a greater force. In this embodiment, the case where the fixing member 283 is a nut has been described, but the fixing member 283 may be a ring-shaped collar member that is press-fitted onto the shaft 21 .
　ここで、一対のエンドプレート２８のうち軸方向一方側（＋Ｙ側）に位置する一方に着目してエンドプレート２８の形状をより具体的に説明する。図４に示すように、一方のエンドプレート２８は、ロータコア２４の軸方向一方側（＋Ｙ側）の端面を覆う。一方のエンドプレート２８は、軸方向一方側（＋Ｙ側）を向く第１面２８ａを有する。第１面２８ａは、径方向外側に向かうに従い軸方向他方側（－Ｙ）に位置する方向に傾斜する。また、第１面２８ａは、軸方向一方側（＋Ｙ側）に向けて凸となる湾曲面である。また、第１面２８ａは、中心軸線Ｊ２の全周に亘って一定の形状である。すなわち、第１面２８ａは、中心軸線Ｊ２を通過する任意の何れの断面においても同一の形状を有する。 Here, the shape of the end plate 28 will be described more specifically, focusing on one of the pair of end plates 28 located on one side (+Y side) in the axial direction. As shown in FIG. 4 , one end plate 28 covers the end face on one axial side (+Y side) of the rotor core 24 . One end plate 28 has a first surface 28a facing one axial side (+Y side). The first surface 28a inclines toward the other axial side (-Y) as it extends radially outward. Further, the first surface 28a is a curved surface that is convex toward one axial direction side (+Y side). Further, the first surface 28a has a constant shape over the entire circumference of the center axis J2. That is, the first surface 28a has the same shape in any cross section passing through the central axis J2.
　近年、車両用の駆動装置において、ロータの高速回転を可能とするモータの開発が進んでいる。ロータが高速回転する場合、ロータの空気抵抗がモータの駆動効率の低下を招く。本実施形態では、ロータの回転時の空気抵抗を低減することでモータの駆動効率を高めた駆動装置を提供することを目的の一つとしている。 In recent years, the development of motors that enable high-speed rotation of rotors in vehicle drive units is progressing. When the rotor rotates at high speed, the air resistance of the rotor causes a decrease in driving efficiency of the motor. One of the objects of the present embodiment is to provide a driving device in which the driving efficiency of the motor is improved by reducing the air resistance during rotation of the rotor.
　本実施形態によれば、第１面２８ａを滑らかな湾曲面とすることで、ロータ２０が高速回転した際に、エンドプレート２８における空気抵抗を低減させることができる。これにより、駆動装置１の駆動効率を高めることができる。さらに、ロータ２０が高速回転した際に、ロータ２０が安定して回転することができるため、風切り音を発生させることやロータ２０の振れ回りを抑制でき、駆動装置１の静音性を向上できる。 According to this embodiment, by forming the first surface 28a into a smoothly curved surface, it is possible to reduce the air resistance in the end plate 28 when the rotor 20 rotates at high speed. Thereby, the drive efficiency of the drive device 1 can be improved. Furthermore, when the rotor 20 rotates at a high speed, the rotor 20 can be stably rotated, so that the generation of wind noise and whirling of the rotor 20 can be suppressed, and the quietness of the drive device 1 can be improved.
　なお、ロータにおいて、一対のエンドプレート２８のうち軸方向他方側（－Ｙ側）に位置する他方のエンドプレート２８は、一方のエンドプレート２８と軸方向に反転した形状を有する。言い換えると、軸方向他方側（－Ｙ側）に位置する他方のエンドプレート２８の形状は、一方のエンドプレート２８の形状と同じであるが、配置される向きが異なる。すなわち、他方のエンドプレート２８は、ロータコア２４の軸方向他方側（－Ｙ側）の端面を覆う。他方のエンドプレート２８は、軸方向他方側（－Ｙ側）を向く第２面２８ｆを有する。第２面２８ｆは、径方向外側に向かうに従い軸方向一方側（＋Ｙ）に位置する方向に傾斜する。また、第２面２８ｆは、軸方向他方側（－Ｙ側）に向けて凸となる湾曲面である。さらに、第２面２８ｆは、中心軸線Ｊ２の全周に亘って一定の形状である。 In the rotor, of the pair of end plates 28, the other end plate 28 positioned on the other side (-Y side) in the axial direction has a shape that is the opposite of the one end plate 28 in the axial direction. In other words, the shape of the other end plate 28 located on the other side (−Y side) in the axial direction is the same as the shape of the one end plate 28, but the arrangement direction is different. That is, the other end plate 28 covers the end surface of the rotor core 24 on the other axial side (−Y side). The other end plate 28 has a second surface 28f facing the other axial side (-Y side). The second surface 28f inclines toward the axial one side (+Y) as it extends radially outward. Further, the second surface 28f is a curved surface that is convex toward the other axial direction side (-Y side). Furthermore, the second surface 28f has a constant shape over the entire circumference of the center axis J2.
　エンドプレート２８のロータコア２４側を向く面には、ロータコア２４に向かって突出す第１突出部２８１、および第２突出部２８２が設けられる。すなわち、エンドプレート２８は、ロータコア２４側を向く面からロータコア２４側に向かって突出する突出部２８１、２８２を有する。図５に示すように、第１突出部２８１および第２突出部２８２は、それぞれ、周方向に延びる。好ましくは、第１突出部２８１および第２突出部２８２は、それぞれ、略環状である。第１突出部２８１は、第２突出部２８２よりも径方向外側に位置する。第１突出部２８１の軸方向の長さは、第２突出部２８２の軸方向の長さよりも、短い。 A first projecting portion 281 and a second projecting portion 282 projecting toward the rotor core 24 are provided on the surface of the end plate 28 facing the rotor core 24 side. That is, the end plate 28 has protruding portions 281 and 282 that protrude toward the rotor core 24 side from the surface facing the rotor core 24 side. As shown in FIG. 5, the first protrusion 281 and the second protrusion 282 each extend in the circumferential direction. Preferably, the first protrusion 281 and the second protrusion 282 are each substantially annular. The first projecting portion 281 is positioned radially outward of the second projecting portion 282 . The axial length of the first protrusion 281 is shorter than the axial length of the second protrusion 282 .
　図１に示すように、第２突出部２８２の内周面（径方向内側を向く面）は、エンドプレート２８の貫通孔２８ｈに連なる。第２突出部２８２の内周面の少なくとも一部は、シャフト２１の外側面（径方向外側を向く面）と接触する。これにより、エンドプレート２８は、中心軸線Ｊ２に対して位置決めされる。第２突出部２８２の先端は、ロータコア２４の軸方向を向く面と接触する。これにより、エンドプレート２８を介して、安定的にロータコア２４をシャフト２１に固定することができる。 As shown in FIG. 1 , the inner peripheral surface (the surface facing radially inward) of the second projecting portion 282 continues to the through hole 28 h of the end plate 28 . At least part of the inner peripheral surface of the second projecting portion 282 contacts the outer surface (the surface facing radially outward) of the shaft 21 . Thereby, the end plate 28 is positioned with respect to the central axis J2. The tip of the second projecting portion 282 contacts the axially facing surface of the rotor core 24 . Thereby, the rotor core 24 can be stably fixed to the shaft 21 via the end plate 28 .
　本実施形態のロータ２０によれば、ロータ２０の回転バランスが悪い場合に、第１突出部２８１に切削加工を施すなどして第１突出部２８１の突出高さを部分的に変えることで、ロータ２０のバランス修正を行うことが可能である。これにより、ロータ２０の回転時に生じる中心軸線Ｊ２周りの回転振れを抑制することができる。また、本実施形態のエンドプレート２８によれば、第１突出部２８１が、ロータ２０の外表面に露出していない。このため、バランス修正を行ったことで第１突出部２８１の周方向の一部の形状が、周方向の他の部位と異なる形状になった場合であっても、ロータ２０の回転時の空気抵抗が増大することを抑制できる。 According to the rotor 20 of the present embodiment, when the rotation balance of the rotor 20 is poor, by partially changing the protrusion height of the first protrusion 281 by cutting the first protrusion 281, A balance correction of the rotor 20 can be made. As a result, rotational vibration around the central axis J2 that occurs when the rotor 20 rotates can be suppressed. Further, according to the end plate 28 of this embodiment, the first projecting portion 281 is not exposed on the outer surface of the rotor 20 . Therefore, even if the shape of a part of the first projecting portion 281 in the circumferential direction differs from the shape of the other portion in the circumferential direction due to the balance correction, the air flow during the rotation of the rotor 20 does not change. An increase in resistance can be suppressed.
　図１に示すように、ステータ３０は、中心軸線Ｊ２を中心とする環状のステータコア３２と、ステータコア３２に取り付けられるコイル３１と、カバー部材３２４と、ステータコア３２とコイル３１との間に介在するインシュレータ（図示略）とを有する。ステータ３０は、ハウジング６に保持される。 As shown in FIG. 1, the stator 30 includes an annular stator core 32 centered on the central axis J2, coils 31 attached to the stator core 32, a cover member 324, and an insulator interposed between the stator core 32 and the coils 31. (not shown). Stator 30 is held in housing 6 .
　図２に示すように、ステータコア３２は、円環状のヨークと、ヨークの内周面から径方向内方に突出する複数の磁極歯を有する。磁極歯間には、コイル３１が挿入されるスロット３２２が位置する。スロット３２２に挿入されたコイル線３１ｅはいわゆる平角線である。 As shown in FIG. 2, the stator core 32 has an annular yoke and a plurality of magnetic pole teeth protruding radially inward from the inner peripheral surface of the yoke. A slot 322 into which the coil 31 is inserted is located between the magnetic pole teeth. The coil wire 31e inserted into the slot 322 is a so-called rectangular wire.
　図３に示すように、スロット３２２のコイル線３１ｅの径方向内側には、樹脂部材３２３が挿入される。樹脂部材は、別部材でもよいし、ワニス等で構成してもよい。樹脂部材３２３がスロット３２２内に挿入されることにより、スロット３２２におけるコイル線３１ｅ同士の間の隙間を小さくすることができるとともに、隣り合うティース同士の間を隙間が樹脂部材３２３の少なくとも一部によって埋められる。これにより、ロータ２０とステータ３０との間の隙間凹凸を小さくすることができる。その結果、ロータ２０とステータ３０との間において、ロータ２０の回転時における空気抵抗を低減させることができる。 As shown in FIG. 3, a resin member 323 is inserted inside the slot 322 in the radial direction of the coil wire 31e. The resin member may be a separate member or may be made of varnish or the like. By inserting the resin member 323 into the slot 322, the gap between the coil wires 31e in the slot 322 can be reduced, and at least a part of the resin member 323 closes the gap between the adjacent teeth. be buried. Thereby, the unevenness of the gap between the rotor 20 and the stator 30 can be reduced. As a result, air resistance can be reduced between the rotor 20 and the stator 30 when the rotor 20 rotates.
　図１に示すように、コイル３１は、第１のコイルエンド３１ａと、第２のコイルエンド３１ｂと、を有する。第１のコイルエンド３１ａは、ステータコア３２の軸方向他方側に突出する。第２のコイルエンド３１ｂは、ステータコア３２の軸方向一方側に突出する。すなわち、コイル３１は、ステータコア３２から軸方向に突出するコイルエンド３１ａ、３１ｂを有する。コイルエンド３１ａ、３１ｂは、中心軸線Ｊ２を中心とする環状である。 As shown in FIG. 1, the coil 31 has a first coil end 31a and a second coil end 31b. The first coil end 31a protrudes to the other side of the stator core 32 in the axial direction. The second coil end 31b protrudes to one side of the stator core 32 in the axial direction. That is, the coil 31 has coil ends 31a and 31b that protrude from the stator core 32 in the axial direction. The coil ends 31a and 31b are ring-shaped around the central axis J2.
　カバー部材３２４は、周方向に延びる環状の部材である。カバー部材３２４は、ステータコア３２の軸方向一方側および他方側の両方に、それぞれ配置される。一対のカバー部材３２４のうち、一方のカバー部材３２４は第１のコイルエンド３１ａを覆い、他方のカバー部材３２４は第２のコイルエンド３１ｂを覆う。カバー部材３２４は、ステータコア３２の軸方向を向く面に、ねじ止めや接着等によって固定される。これにより、カバー部材３２４は、ステータコア３２に装着される。カバー部材３２４は、内壁３２４ａと外壁３２４ｃと蓋部３２４ｂとを有する。 The cover member 324 is an annular member extending in the circumferential direction. The cover members 324 are arranged on both the axial one side and the other axial side of the stator core 32 . Of the pair of cover members 324, one cover member 324 covers the first coil end 31a, and the other cover member 324 covers the second coil end 31b. The cover member 324 is fixed to the axially facing surface of the stator core 32 by screwing, bonding, or the like. Thereby, the cover member 324 is attached to the stator core 32 . The cover member 324 has an inner wall 324a, an outer wall 324c and a lid portion 324b.
　内壁３２４ａは、コイルエンド３１ａ、３１ｂの径方向内側に位置する。内壁３２４ａは、中心軸線Ｊ２を中心とする略円筒状である。内壁３２４ａは、コイルエンド３１ａ、３１ｂを径方向内側から覆う。 The inner wall 324a is located radially inside the coil ends 31a and 31b. The inner wall 324a has a substantially cylindrical shape centered on the central axis J2. The inner wall 324a covers the coil ends 31a and 31b from the inside in the radial direction.
　外壁３２４ｃは、コイルエンド３１ａ、３１ｂの径方向外側に位置する。外壁３２４ｃは、中心軸線Ｊ２を中心とする略円筒状である。外壁３２４ｃは、コイルエンド３１ａ、３１ｂを径方向外側から覆う。外壁３２４ｃは、径方向において内壁３２４ａと対向する。外壁３２４ｃと内壁３２４ａとの間には、コイルエンド３１ａ、３１ｂが配置される。 The outer wall 324c is located radially outside the coil ends 31a and 31b. The outer wall 324c has a substantially cylindrical shape centered on the central axis J2. The outer wall 324c covers the coil ends 31a and 31b from the radial outside. The outer wall 324c radially faces the inner wall 324a. Coil ends 31a and 31b are arranged between the outer wall 324c and the inner wall 324a.
　蓋部３２４ｂは、内壁３２４ａと外壁３２４ｃとを繋ぐ。蓋部３２４ｂは、軸方向と直交する略板状である。蓋部３２４ｂは、コイルエンド３１ａ、３１ｂを軸方向から覆う。蓋部３２４ｂは、ステータコア３２の軸方向を向く面と対向して配置される。 The lid portion 324b connects the inner wall 324a and the outer wall 324c. The lid portion 324b has a substantially plate shape orthogonal to the axial direction. The lid portion 324b axially covers the coil ends 31a and 31b. The lid portion 324b is arranged to face the surface of the stator core 32 facing the axial direction.
　カバー部材３２４とステータコア３２とによって囲まれる空間は、コイルエンド３１ａ、３１ｂを収容するコイルエンド収容空間Ａを構成する。コイルエンド収容空間Ａは、内壁３２４ａ、蓋部３２４ｂ、外壁３２４ｃ、およびステータコア３２の軸方向を向く面によって囲まれる。コイルエンド収容空間Ａは、中心軸線Ｊ２を中心として周方向に略円環状に延びる。 A space surrounded by the cover member 324 and the stator core 32 constitutes a coil end accommodation space A that accommodates the coil ends 31a and 31b. The coil end accommodation space A is surrounded by the inner wall 324a, the lid portion 324b, the outer wall 324c, and the surfaces of the stator core 32 facing the axial direction. The coil end accommodation space A extends in a substantially annular shape in the circumferential direction around the center axis J2.
　本実施形態のステータ３０には、一対のカバー部材３２４が設けられる。このため、コイルエンド収容空間Ａは、ステータコア３２の軸方向一方側、および他方側にそれぞれ設けられる。一対のコイルエンド収容空間Ａのうち、軸方向一方側に位置する一方のコイルエンド収容空間Ａには第１のコイルエンド３１ａが収容され、軸方向他方側に位置する他方のコイルエンド収容空間Ａには第２のコイルエンド３１ｂが収容される。 A pair of cover members 324 are provided on the stator 30 of the present embodiment. Therefore, the coil end accommodation spaces A are provided on one side and the other side of the stator core 32 in the axial direction. A first coil end 31a is accommodated in one of the coil end accommodation spaces A located on one side in the axial direction of the pair of coil end accommodation spaces A, and the other coil end accommodation space A located on the other side in the axial direction. accommodates the second coil end 31b.
　＜流体＞
　図１に示すように、流体Ｏは、流路９０、１００を循環する。流体Ｏは、第１のベアリング２６および第２のベアリング２７の潤滑用として使用される。また、流体Ｏは、モータ２の冷却用として使用される。流体Ｏは、タンク９９に溜る。流体Ｏは、潤滑油および冷却油の機能を奏するため、粘度の低いオートマチックトランスミッション用潤滑油（ＡＴＦ：Automatic Transmission Fluid）と同等のものを用いることが好ましい。なお、後述する第２実施形態においては、流体Ｏは、後述するギヤ室８２内の下部領域、すなわち流体溜りＰに溜る。 <Fluid>
As shown in FIG. 1, fluid O circulates through channels 90 and 100 . The fluid O is used for lubricating the first bearing 26 and the second bearing 27 . Also, the fluid O is used for cooling the motor 2 . Fluid O accumulates in tank 99 . Since the fluid O functions as a lubricating oil and a cooling oil, it is preferable to use a low-viscosity lubricating oil equivalent to automatic transmission fluid (ATF). In the second embodiment, which will be described later, the fluid O accumulates in a lower region, that is, a fluid pool P, inside the gear chamber 82, which will be described later.
　＜流路＞
　図１に示すように、流路９０、１００は、流体Ｏをタンク９９からモータ２に供給し、さらに再びタンク９９に導く流体Ｏの経路である。流路９０、１００は、ハウジング６に設けられた内部流路９０内と、ハウジング６の外部に設けられた外部流路１００と、を含む。内部流路９０の一部は、ハウジング６を構成する部材の壁内部に設けられる。また、内部流路９０の他の一部は、収容空間８０内に設けられる。外部流路１００は収容空間８０の外部に設けられる。外部流路１００は、例えば、ギヤ部（図示略）を収容するギヤハウジング（図示略）内に設けられていてもよいし、ホース、又は配管であってもよい。 <Flow path>
As shown in FIG. 1, the flow paths 90 and 100 are paths of the fluid O that supply the fluid O from the tank 99 to the motor 2 and lead it to the tank 99 again. Channels 90 , 100 include an internal channel 90 provided in housing 6 and an external channel 100 provided outside housing 6 . A part of the internal flow path 90 is provided inside the wall of the member that constitutes the housing 6 . Another part of the internal flow path 90 is provided inside the accommodation space 80 . The external channel 100 is provided outside the housing space 80 . The external flow path 100 may be provided, for example, in a gear housing (not shown) that accommodates a gear portion (not shown), or may be a hose or pipe.
　なお、本明細書において、「流路」とは、流体Ｏの経路を意味する概念である。したがって、「流路」とは、定常的に一方向に向かう流体Ｏが流れる「流路」のみならず、流体Ｏを一時的に滞留させる経路（例えばリザーバ）および流体Ｏ滴り落ちる経路をも含む概念である。 In this specification, the term "flow path" is a concept that means the route of the fluid O. Therefore, the term "flow path" includes not only a "flow path" in which the fluid O flows steadily in one direction, but also a path for temporarily retaining the fluid O (for example, a reservoir) and a path through which the fluid O drips. It is a concept.
　内部流路９０は、モータ２のハウジング６の壁内部に設けられた第１の流路９１と、収容空間８０内に設けられた第２の流路９２と、を有する。第１の流路９１および第２の流路９２は、第２の流路９２、第１の流路９１の順で接続されモータ２内で流体Ｏが流通する流路として構成される。流体Ｏは、第１の流路９１および第２の流路９２において、モータ２を内部および外部から冷却する。 The internal flow path 90 has a first flow path 91 provided inside the wall of the housing 6 of the motor 2 and a second flow path 92 provided inside the housing space 80 . The first flow path 91 and the second flow path 92 are connected in the order of the second flow path 92 and the first flow path 91 and configured as a flow path through which the fluid O flows within the motor 2 . The fluid O cools the motor 2 internally and externally in the first flow path 91 and the second flow path 92 .
　第２の流路９２は、一対のコイルエンド収容空間Ａと、ステータコア３２に設けられるコア貫通孔３２１と、を有する。すなわち、一対のコイルエンド収容空間Ａは、第２の流路９２の一部を構成する。コア貫通孔３２１は、ステータコア３２を軸方向に延びる。コア貫通孔３２１は、ステータコアに対し軸方向両側に配置される一対のコイルエンド収容空間Ａ同士を繋ぐ。また、カバー部材３２４の蓋部３２４ｂには、外部流路１００の供給口９５２が接続される。すなわち、コイルエンド収容空間Ａには、供給口９５２が繋がっている。 The second flow path 92 has a pair of coil end housing spaces A and a core through hole 321 provided in the stator core 32 . That is, the pair of coil end accommodation spaces A constitute a part of the second flow path 92 . Core through hole 321 extends axially through stator core 32 . The core through hole 321 connects a pair of coil end accommodation spaces A arranged on both sides in the axial direction with respect to the stator core. Also, the supply port 952 of the external channel 100 is connected to the lid portion 324b of the cover member 324 . That is, the coil end accommodation space A is connected to the supply port 952 .
　外部流路１００のタンク９９からポンプ９６により吸い出された流体Ｏは、供給口９５２から吐出され、第２の流路９２の一方のコイルエンド収容空間Ａに供給される。一方のコイルエンド収容空間Ａを流れる流体Ｏは、第１のコイルエンド３１ａに接触し第１のコイルエンド３１ａを冷却する。第１のコイルエンド３１ａを冷却した流体Ｏは、ステータコア３２を軸方向に貫通するコア貫通孔３２１を軸方向に移動し、軸方向において逆側に配置されるコイルエンド収容空間Ａに達して第２のコイルエンド３１ｂを冷却する。また、流体Ｏは、コア貫通孔３２１を通る際に、ステータコア３２を冷却する。第２のコイルエンド３１ｂを冷却した流体Ｏは、軸方向に設けられた流路を通り、ハウジング６に構成されている第１の流路９１に供給される。 The fluid O sucked out from the tank 99 of the external channel 100 by the pump 96 is discharged from the supply port 952 and supplied to one coil end accommodation space A of the second channel 92 . The fluid O flowing through one coil end housing space A contacts the first coil end 31a and cools the first coil end 31a. The fluid O that has cooled the first coil end 31a moves in the axial direction through the core through hole 321 that axially penetrates the stator core 32, reaches the coil end accommodation space A arranged on the opposite side in the axial direction, and reaches the first coil end. 2 coil end 31b is cooled. Further, the fluid O cools the stator core 32 when passing through the core through-holes 321 . The fluid O that has cooled the second coil end 31b is supplied to the first flow path 91 formed in the housing 6 through the flow path provided in the axial direction.
　第１の流路９１の流体Ｏは、ハウジング６の壁内部で、＋Ｚ方向と－Ｚ方向にそれぞれ分岐する。－Ｚ方向に分岐した流体Ｏは、第２のベアリング２７に供給される。ハウジング６の壁内部において＋Ｚ方向に分岐された流体Ｏは、更に＋Ｙ方向と－Ｙ方向に、それぞれ分岐する。 Inside the wall of the housing 6, the fluid O in the first flow path 91 branches into the +Z direction and the -Z direction, respectively. The fluid O branched in the -Z direction is supplied to the second bearing 27 . The fluid O branched in the +Z direction inside the wall of the housing 6 is further branched in the +Y direction and the -Y direction.
　ハウジング６の壁内部で、－Ｙ方向に分岐した流体Ｏは、シャフト２１に設けられた中空部２２に供給され、シャフト２１とロータコア２４を冷却することができる。シャフト２１とロータコア２４を冷却した流体Ｏは、流体溜りＰに溜まる。 Inside the wall of the housing 6 , the fluid O branched in the -Y direction is supplied to the hollow portion 22 provided in the shaft 21 and can cool the shaft 21 and the rotor core 24 . The fluid O that cools the shaft 21 and the rotor core 24 accumulates in the fluid reservoir P.
　ハウジング６の壁内部において＋Ｙ方向に分岐した流体Ｏは、ハウジング６の壁内部に設けられた軸方向流路部９１２、および複数の径方向流路部９１１を介してステータコア３２（すなわち、モータ２）に供給され、モータ２を冷却する。また、流体Ｏの一部は、第１のベアリング２６にも供給される。すなわち、第１の流路９１を流れる流体Ｏは、ステータコア３２を冷却しつつ、第１のベアリング２６と第２のベアリング２７とを潤滑する。流体Ｏは、ステータコア３２、第１のベアリング２６、および第２のベアリング２７を流れた後、流体溜りＰに溜まる。 The fluid O branched in the +Y direction inside the wall of the housing 6 passes through the stator core 32 (that is, the motor 2 ) to cool the motor 2 . A portion of the fluid O is also supplied to the first bearing 26 . That is, the fluid O flowing through the first flow path 91 cools the stator core 32 and lubricates the first bearing 26 and the second bearing 27 . Fluid O accumulates in fluid pool P after flowing through stator core 32 , first bearing 26 , and second bearing 27 .
　本実施形態によれば、駆動装置１は、流体Ｏが流れる第１の流路９１を備える。第１の流路９１は、軸方向流路部９１２と、複数の径方向流路部９１１と、を有する。軸方向流路部９１２は、筒状部６１の壁内部を軸方向に延びる。径方向流路部９１１は、筒状部６１の壁内部を径方向に延びる。径方向流路部９１１は、軸方向流路部９１２から径方向内側に延びる。また、径方向流路部９１１は、ステータ３０に向けて開口する。 According to this embodiment, the driving device 1 includes the first flow path 91 through which the fluid O flows. The first channel 91 has an axial channel portion 912 and a plurality of radial channel portions 911 . The axial channel portion 912 extends axially inside the wall of the tubular portion 61 . The radial channel portion 911 extends radially inside the wall of the cylindrical portion 61 . The radial channel portion 911 extends radially inward from the axial channel portion 912 . Moreover, the radial flow path portion 911 opens toward the stator 30 .
　本実施形態の第１の流路９１によれば、径方向流路部９１１の開口位置を適切に配置することで、径方向流路部９１１からステータ３０の発熱量が高い箇所に流体Ｏを直接的に噴射することが可能となる。本実施形態によれば、ステータ３０の温度が高くなりやすく冷却を必要とする箇所を集中的に冷却することが可能となり、ステータ３０を効率的に冷却できる。また、本実施形態の径方向流路部９１１は、軸方向流路部９１２から径方向外側に延びる。このため、軸方向流路部９１２の延びる軸方向の何れの位置においても径方向流路部９１１を配置しやすく、ステータ３０に対し所望の位置から流体Ｏを噴射し易い。さらに、本実施形態の筒状部６１には、軸方向に並ぶ複数の径方向流路部９１１が設けられる。このため、ステータ３０に対し軸方向の複数個所に対し流体Ｏを供給することが可能となり、ステータ３０をより均一に冷却できる。 According to the first flow path 91 of the present embodiment, by appropriately arranging the opening position of the radial flow path portion 911, the fluid O can flow from the radial flow path portion 911 to the portion of the stator 30 where the amount of heat generated is high. It is possible to inject directly. According to the present embodiment, it is possible to intensively cool a portion of the stator 30 that tends to become hot and requires cooling, so that the stator 30 can be efficiently cooled. Further, the radial flow path portion 911 of this embodiment extends radially outward from the axial flow path portion 912 . Therefore, it is easy to dispose the radial flow path portion 911 at any position in the axial direction in which the axial flow path portion 912 extends, and it is easy to jet the fluid O to the stator 30 from a desired position. Furthermore, the cylindrical portion 61 of the present embodiment is provided with a plurality of radial flow passage portions 911 aligned in the axial direction. Therefore, the fluid O can be supplied to a plurality of locations in the axial direction of the stator 30, and the stator 30 can be cooled more uniformly.
　また、本実施形態の径方向流路部９１１は、ステータコア３２の外周面に向けて開口する。第１の流路９１は、径方向流路部９１１からステータコア３２に流体Ｏを噴射しステータコア３２を効率的に冷却できる。 Also, the radial flow path portion 911 of the present embodiment opens toward the outer peripheral surface of the stator core 32 . The first flow path 91 can jet the fluid O from the radial flow path portion 911 to the stator core 32 to efficiently cool the stator core 32 .
　本実施形態において、ポンプ９６は、電気により駆動する電動ポンプである。流体溜りＰに溜まった流体Ｏは、ポンプ９６により吸い上げられて、タンク９９に流体Ｏを供給する。なお、ポンプ９６は、機械式で駆動するタイプなど、他の種類のポンプであってもよい。 In this embodiment, the pump 96 is an electrically driven pump. The fluid O accumulated in the fluid pool P is sucked up by the pump 96 and supplied to the tank 99 . It should be noted that the pump 96 may be of another type, such as a mechanically driven type.
　クーラー９７には、ラジエーター（図示略）で冷却された冷却水を通過させる冷却水用配管（図示略）が接続される。クーラー９７の内部を通過する流体Ｏは、冷却水用配管を通過する冷却水との間で熱交換されて、冷却される。なお、冷却水用配管の経路中には、図示しないインバータユニットが設けられる。冷却水用配管を通過する冷却水は、図示しないインバータユニットを冷却する。 A cooling water pipe (not shown) for passing cooling water cooled by a radiator (not shown) is connected to the cooler 97 . The fluid O passing through the cooler 97 is cooled by heat exchange with the cooling water passing through the cooling water pipe. An inverter unit (not shown) is provided in the path of the cooling water pipe. Cooling water passing through the cooling water pipe cools an inverter unit (not shown).
　本実施形態によれば、クーラー９７を通過した直後の流体Ｏでロータ２０とステータ３０を効率的に冷却しつつ、第１のベアリング２６と第２のベアリング２７を潤滑することができる。なお、クーラー９７、ポンプ９６、およびタンク９９は、ハウジング６に固定されてもよい。 According to this embodiment, the rotor 20 and the stator 30 can be efficiently cooled by the fluid O immediately after passing through the cooler 97, and the first bearing 26 and the second bearing 27 can be lubricated. Cooler 97 , pump 96 and tank 99 may be fixed to housing 6 .
＜第２実施形態＞
　次に、第２実施形態の駆動装置１１０について説明する。
　図５に示すように、本実施形態の駆動装置１１０は、モータ２に加えて減速装置３を有する。減速装置３は、第１実施形態のギヤ部（図示略）に相当する。ハウジング６の軸方向他方側には、隔壁を介してギヤ室８２が取り付けられる。ギヤ室８２の内部には、減速装置３が収容される。シャフト２１は、減速装置３に接続される。本実施形態の駆動装置１１０は、減速装置３を収容するギヤ室８２にある流体Ｏをポンプにより吸い上げる事で、モータ２の冷却とベアリングの潤滑を行う。 <Second embodiment>
Next, the drive device 110 of 2nd Embodiment is demonstrated.
As shown in FIG. 5 , the drive device 110 of this embodiment has a speed reducer 3 in addition to the motor 2 . The reduction gear 3 corresponds to the gear portion (not shown) of the first embodiment. A gear chamber 82 is attached to the other axial side of the housing 6 via a partition wall. The reduction gear 3 is housed inside the gear chamber 82 . The shaft 21 is connected to the reduction gear 3 . The driving device 110 of the present embodiment cools the motor 2 and lubricates the bearings by pumping up the fluid O in the gear chamber 82 housing the speed reduction device 3 .
＜第３実施形態＞
　次に、第３実施形態の駆動装置１１０Ｂについて説明する。
　本実施形態の駆動装置１１０Ｂは、第１実施形態と比較して、内部流路９０Ｂの構成が異なる。なお、上述の実施形態と同一態様の構成要素については、同一符号を付し、その説明を省略する。 <Third Embodiment>
Next, the drive device 110B of 3rd Embodiment is demonstrated.
A driving device 110B of the present embodiment differs from that of the first embodiment in the configuration of an internal flow path 90B. In addition, the same code|symbol is attached|subjected about the component of the same aspect as the above-mentioned embodiment, and the description is abbreviate|omitted.
　本実施形態の内部流路９０Ｂは、流路９１Ｂを有する。流路９１Ｂは、第１実施形態の第１の流路９１（図１参照）に相当する流路であり、流体Ｏが流れる。流路９１Ｂは、軸方向流路部９１２と、複数の径方向流路部９１１、９１１Ｂを有する。本実施形態の複数の径方向流路部９１１、９１１Ｂには、複数の第１径方向流路部９１１と、複数の第２径方向流路部９１１Ｂと、が含まれる。 The internal channel 90B of this embodiment has a channel 91B. The channel 91B is a channel corresponding to the first channel 91 (see FIG. 1) of the first embodiment, and the fluid O flows therethrough. The channel 91B has an axial channel portion 912 and a plurality of radial channel portions 911 and 911B. The plurality of radial flow passage portions 911 and 911B of the present embodiment includes a plurality of first radial flow passage portions 911 and a plurality of second radial flow passage portions 911B.
　軸方向流路部９１２は、ハウジング６の筒状部６１の壁内部を軸方向に延びる。第１径方向流路部９１１、および第２径方向流路部９１１Ｂは、筒状部６１の壁内部を径方向に延びる。第１径方向流路部９１１、および第２径方向流路部９１１Ｂは、軸方向流路部９１２から径方向内側に延びる。また、第１径方向流路部９１１、および第２径方向流路部９１１Ｂは、ステータ３０に向けて開口する。 The axial channel portion 912 extends axially inside the wall of the tubular portion 61 of the housing 6 . The first radial flow path portion 911 and the second radial flow path portion 911B extend radially inside the wall of the cylindrical portion 61 . The first radial flow path portion 911 and the second radial flow path portion 911B extend radially inward from the axial flow path portion 912 . Also, the first radial flow path portion 911 and the second radial flow path portion 911B open toward the stator 30 .
　複数の第１径方向流路部９１１は、軸方向に沿って並んで配置される。複数の第１径方向流路部９１１は、ステータコア３２の外周面に向けて開口する。第１径方向流路部９１１は、ステータコア３２の外周面に向けて流体Ｏを噴射する。第１径方向流路部９１１から噴射された流体Ｏは、ステータコア３２を冷却する。 The plurality of first radial flow passage portions 911 are arranged side by side along the axial direction. The plurality of first radial flow passage portions 911 open toward the outer peripheral surface of the stator core 32 . The first radial flow path portion 911 jets the fluid O toward the outer peripheral surface of the stator core 32 . The fluid O injected from the first radial flow path portion 911 cools the stator core 32 .
　第２径方向流路部９１１Ｂは、コイルエンド３１ａ、３１ｂに向けて開口する。本実施形態の流路９１Ｂには、一対の第２径方向流路部９１１Ｂが設けられる。一対の第２径方向流路部９１１Ｂのうち軸方向一方側（＋Ｙ側）に位置する一方の開口は、径方向において第１のコイルエンド３１ａと対向する。また、一対の第２径方向流路部９１１Ｂのうち、軸方向他方側（－Ｙ側）に位置する他方の開口は、径方向において第２のコイルエンド３１ｂと対向する。一対の第２径方向流路部９１１Ｂは、コイルエンド３１ａ、３１ｂに向けて流体Ｏを噴射する。第２径方向流路部９１１Ｂから噴射された流体Ｏは、コイルエンド３１ａ、３１ｂを冷却する。ステータ３０では、ステータ３０の他の部位と比較すると、コイル３１の発熱量が大きい。本実施形態によれば、ステータ３０において、比較的、高温となり易いコイル３１に流体Ｏを直接的に噴射することが可能となり、ステータ３０を効率的に冷却できる。 The second radial flow path portion 911B opens toward the coil ends 31a and 31b. A pair of second radial flow path portions 911B are provided in the flow path 91B of the present embodiment. One of the openings of the pair of second radial flow path portions 911B located on one axial side (+Y side) faces the first coil end 31a in the radial direction. The other opening of the pair of second radial flow passage portions 911B located on the other axial side (−Y side) faces the second coil end 31b in the radial direction. The pair of second radial flow path portions 911B jet the fluid O toward the coil ends 31a and 31b. The fluid O ejected from the second radial flow path portion 911B cools the coil ends 31a and 31b. In stator 30 , coil 31 generates a large amount of heat compared to other parts of stator 30 . According to this embodiment, in the stator 30, it is possible to directly inject the fluid O to the coil 31, which tends to reach a relatively high temperature, so that the stator 30 can be efficiently cooled.
　本実施形態のステータ３０は、第１実施形態と同様に、カバー部材３２４を有する。カバー部材３２４とステータコア３２とは、コイルエンド収容空間Ａを囲む。カバー部材３２４の外壁３２４ｃには、外壁３２４ｃを径方向に貫通する貫通孔３２４ｈが設けられる。第２径方向流路部９１１Ｂは、貫通孔３２４ｈを介して、コイルエンド収容空間Ａに流体Ｏを供給する。 The stator 30 of this embodiment has a cover member 324 as in the first embodiment. Cover member 324 and stator core 32 surround coil end accommodation space A. As shown in FIG. The outer wall 324c of the cover member 324 is provided with a through hole 324h that radially penetrates the outer wall 324c. The second radial flow path portion 911B supplies the fluid O to the coil end accommodation space A via the through hole 324h.
　本実施形態によれば、ステータ３０は、コイルエンド３１ａ、３１ｂを覆うカバー部材３２４を有する。カバー部材３２４は、第２径方向流路部９１１Ｂからコイルエンド３１ａ、３１ｂに噴射されコイルエンド３１ａ、３１ｂに当たって反射する流体Ｏが、四方に飛散、および流出することを抑制する。結果的に、カバー部材３２４は、四方に飛散、および流出しようとする流体Ｏをコイルエンド３１ａ、３１ｂの周囲に留める。これにより、流体Ｏがコイルエンド３１ａ、３１ｂに再び接触するなどして、流体Ｏとコイルエンド３１ａ、３１ｂと接触する時間を長くすることができる。本実施形態によれば、流体Ｏがコイル３１から、より多くの熱を奪うことが可能となり、コイル３１を効率的に冷却できる。なお、このような効果は、カバー部材３２４がコイルエンド３１ａ、３１ｂを何れの方向から覆う場合であっても、一定程度得ることができる。すなわち、このような効果は、カバー部材３２４が、内壁３２４ａ、蓋部３２４ｂ、および外壁３２４ｃの何れか一つのみを有する場合であっても得ることができる。 According to this embodiment, the stator 30 has a cover member 324 that covers the coil ends 31a and 31b. The cover member 324 prevents the fluid O, which is jetted from the second radial flow path portion 911B to the coil ends 31a and 31b and reflected by the coil ends 31a and 31b, from scattering and flowing out in all directions. As a result, the cover member 324 keeps the fluid O, which is about to scatter and flow out, around the coil ends 31a and 31b. As a result, the fluid O contacts the coil ends 31a and 31b again, and the contact time between the fluid O and the coil ends 31a and 31b can be lengthened. According to this embodiment, the fluid O can take more heat from the coil 31, and the coil 31 can be efficiently cooled. Such an effect can be obtained to some extent regardless of which direction the cover member 324 covers the coil ends 31a and 31b. That is, such an effect can be obtained even when the cover member 324 has only one of the inner wall 324a, the lid portion 324b, and the outer wall 324c.
　本実施形態によれば、カバー部材３２４は、コイルエンド３１ａ、３１ｂを径方向内側から覆う内壁３２４ａと、コイルエンド３１ａ、３１ｂを軸方向から覆う蓋部３２４ｂと、を有する。本実施形態によれば、第２径方向流路部９１１Ｂから径方向内側に向けて噴射される流体Ｏが、径方向内側、および軸方向に飛散することを抑制できる。さらに、本実施形態によれば、内壁３２４ａ、蓋部３２４ｂ、およびステータコア３２の軸方向を向く面が、径方向外側に開口する樋状に配置される。したがって、第２径方向流路部９１１Ｂの開口が、コイルエンド３１ａ、３１ｂの上側に位置する場合に、第２径方向流路部９１１Ｂから供給された流体Ｏを、コイルエンド３１ａ、３１ｂに沿って周方向に流すことができる。これにより、周方向に延びるコイルエンド３１ａ、３１ｂの全体に流体Ｏを供給することが可能となり、コイルエンド３１ａ、３１ｂを周方向に沿って均一に冷却できる。 According to this embodiment, the cover member 324 has an inner wall 324a that covers the coil ends 31a and 31b from the inside in the radial direction, and a lid portion 324b that covers the coil ends 31a and 31b from the axial direction. According to the present embodiment, it is possible to prevent the fluid O jetted radially inward from the second radial flow path portion 911B from scattering radially inward and axially. Furthermore, according to the present embodiment, the surfaces of the inner wall 324a, the lid portion 324b, and the stator core 32 facing the axial direction are arranged in a gutter shape that opens radially outward. Therefore, when the openings of the second radial flow path portion 911B are positioned above the coil ends 31a and 31b, the fluid O supplied from the second radial flow path portion 911B flows along the coil ends 31a and 31b. can flow in the circumferential direction. As a result, the fluid O can be supplied to the entire coil ends 31a and 31b extending in the circumferential direction, and the coil ends 31a and 31b can be uniformly cooled along the circumferential direction.
　さらに、本実施形態の内壁３２４ａは、コイルエンド３１ａ、３１ｂと、ロータ２０との間に配置される。このため、内壁３２４ａは、第２径方向流路部９１１Ｂからコイルエンド３１ａ、３１ｂに向けて供給される流体Ｏがロータ２０にかかることを抑制する。ロータ２０が高速回転する場合、ロータ２０に流体Ｏがかかると、この流体Ｏがロータ２０の回転の抵抗になる虞がある。本実施形態によれば、第２径方向流路部９１１Ｂから噴射される流体Ｏがロータ２０の回転の抵抗になることを抑制でき、ロータ２０を効率よく回転させることができる。 Furthermore, the inner wall 324a of the present embodiment is arranged between the coil ends 31a, 31b and the rotor 20. Therefore, the inner wall 324a suppresses the rotor 20 from being supplied with the fluid O from the second radial flow path portion 911B toward the coil ends 31a and 31b. When the rotor 20 rotates at a high speed, if the fluid O is applied to the rotor 20 , the fluid O may act as resistance to the rotation of the rotor 20 . According to the present embodiment, it is possible to prevent the fluid O jetted from the second radial flow path portion 911B from acting as resistance to the rotation of the rotor 20, so that the rotor 20 can be efficiently rotated.
　本実施形態によれば、カバー部材３２４は、内壁３２４ａ、および蓋部３２４ｂに加えて、コイルエンド３１ａ、３１ｂを径方向外側から覆う外壁３２４ｃを有する。本実施形態によれば、カバー部材３２４とステータコア３２とによって囲まれるコイルエンド収容空間Ａを流体Ｏで満たすことができる。結果的に、流体Ｏがコイルエンド３１ａ、３１ｂに接触する時間をさらに長い時間とすることができ、コイル３１を効率的に冷却できる。 According to this embodiment, the cover member 324 has an outer wall 324c that radially covers the coil ends 31a and 31b in addition to the inner wall 324a and the lid portion 324b. According to this embodiment, the fluid O can fill the coil end accommodation space A surrounded by the cover member 324 and the stator core 32 . As a result, the time during which the fluid O contacts the coil ends 31a and 31b can be made longer, and the coil 31 can be efficiently cooled.
　以上に、本発明の様々な実施形態を説明したが、各実施形態における各構成およびそれらの組み合わせ等は一例であり、本発明の趣旨から逸脱しない範囲内で、構成の付加、省略、置換およびその他の変更が可能である。また、本発明は実施形態によって限定されることはない。 Various embodiments of the present invention have been described above, but each configuration and combination thereof in each embodiment are examples, and addition, omission, replacement, and Other changes are possible. Moreover, the present invention is not limited by the embodiments.
　なお、本技術は以下のような構成をとることが可能である。
（１）　中心軸線を中心として回転するロータ、および前記ロータの径方向外側に位置するステータを有するモータと、前記モータを収容する収容空間が設けられるハウジングと、流体が流れる流路と、を備え、前記ハウジングは、前記ステータを径方向外側から囲む筒状部を有し、前記流路は、前記筒状部の壁内部を軸方向に延びる軸方向流路部と、前記軸方向流路部から径方向内側に延びて前記ステータに向けて開口する径方向流路部と、を有する、駆動装置。
（２）　前記ステータは、前記中心軸線を中心とする環状のステータコアと、前記ステータコアに取り付けられるコイルと、を有し、前記径方向流路部は、前記ステータコアの外周面に向けて開口する、（１）に記載の駆動装置。
（３）　前記ステータは、前記中心軸線を中心とする環状のステータコアと、前記ステータコアに取り付けられるコイルと、を有し、前記コイルは、前記ステータコアから軸方向に突出するコイルエンドを有し、前記径方向流路部は、前記コイルエンドに向けて開口する、（１）に記載の駆動装置。
（４）　前記ステータは、前記コイルエンドを覆うカバー部材を有する、（３）に記載の駆動装置。
（５）　前記コイルエンドは、前記中心軸線を中心とする環状であり、前記カバー部材は、前記コイルエンドを径方向内側から覆う内壁と、前記コイルエンドを軸方向から覆う蓋部と、を有する、（４）に記載の駆動装置。
（６）　前記カバー部材は、前記コイルエンドを径方向外側から覆う外壁を有する、（５）に記載の駆動装置。 Note that the present technology can be configured as follows.
(1) A motor having a rotor that rotates around a central axis and a stator that is positioned radially outward of the rotor, a housing provided with a housing space that houses the motor, and a flow path through which a fluid flows. The housing has a cylindrical portion that surrounds the stator from the outside in the radial direction, and the flow path includes an axial flow path portion that extends axially within a wall of the cylindrical portion, and the axial flow path portion. a radial passage portion extending radially inwardly from and opening toward the stator.
(2) The stator has an annular stator core centered on the central axis and coils attached to the stator core, and the radial flow path portion opens toward the outer peripheral surface of the stator core. (1) The driving device according to the above.
(3) The stator has an annular stator core centered on the central axis, and a coil attached to the stator core, the coil has a coil end projecting axially from the stator core, and the The driving device according to (1), wherein the radial flow path portion opens toward the coil end.
(4) The driving device according to (3), wherein the stator has a cover member that covers the coil ends.
(5) The coil end has an annular shape centered on the central axis, and the cover member has an inner wall that radially inwardly covers the coil end, and a cover that axially covers the coil end. , (4).
(6) The driving device according to (5), wherein the cover member has an outer wall that covers the coil end from the radial outside.
　また、上述の実施形態には以下のような技術が含まれる。
（１）　中心軸線を中心として回転するロータ、および前記ロータの径方向外側に位置するステータを有するモータを備え、前記ロータは、中心軸線を中心として軸方向に延びる円柱状のロータコアと、前記ロータコアの軸方向一方側の端面を覆うエンドプレートと、を有し、前記エンドプレートの軸方向一方側を向く面は、径方向外側に向かうに従い軸方向他方側に位置する方向に傾斜し、軸方向一方側に向けて凸となる湾曲面である、駆動装置。
（２）　前記エンドプレートの軸方向一方側を向く面は、中心軸線周りの全周に亘って一定の形状である、（１）に記載の駆動装置。
（３）　前記エンドプレートは、前記ロータコア側を向く面から前記ロータコア側に向かって突出し周方向に延びる突出部を有する、（１）又は（２）に記載の駆動装置。
（４）　前記突出部の先端は、前記ロータコアの軸方向を向く面に接触する、（３）に記載の駆動装置。
（５）　前記ロータは、中心軸線を中心として軸方向に延びるシャフトを有し、前記エンドプレートは、前記突出部として、第１突出部および第２突出部を有し、前記第１突出部は、前記第２突出部よりも径方向外側に位置する、（３）又は（４）に記載の駆動装置。
（６）　前記第２突出部の内周面の少なくとも一部は、前記シャフトの外側面と接触する、（５）に記載の駆動装置。 In addition, the above-described embodiments include the following techniques.
(1) A motor having a rotor that rotates about a central axis and a stator that is positioned radially outward of the rotor. The rotor includes a cylindrical rotor core that extends axially about the central axis; and an end plate covering one end surface in the axial direction of the end plate, the surface of the end plate facing the one axial side is inclined toward the other axial side as it extends radially outward, and A driving device that is a curved surface that is convex toward one side.
(2) The driving device according to (1), wherein the surface of the end plate facing one side in the axial direction has a constant shape over the entire circumference around the central axis.
(3) The drive device according to (1) or (2), wherein the end plate has a protrusion that protrudes toward the rotor core from a surface facing the rotor core and extends in the circumferential direction.
(4) The driving device according to (3), wherein the tip of the protrusion contacts the axially facing surface of the rotor core.
(5) The rotor has a shaft extending axially about a central axis, the end plate has a first protrusion and a second protrusion as the protrusions, and the first protrusion is , the driving device according to (3) or (4), which is positioned radially outward of the second protrusion.
(6) The driving device according to (5), wherein at least a portion of the inner peripheral surface of the second protrusion contacts the outer surface of the shaft.
１，１１０，１１０Ｂ…駆動装置、２…モータ、６…ハウジング、２０…ロータ、２１…シャフト、２４…ロータコア、２８…エンドプレート、３０…ステータ、３１…コイル、３１ａ，３１ｂ…コイルエンド、３２…ステータコア、６１…筒状部、８０…収容空間、９１，９１Ｂ…流路、２８１…第１突出部（突出部）、２８２…第２突出部（突出部）、３２４…カバー部材、３２４ａ…内壁、３２４ｂ…蓋部、３２４ｃ…外壁、９１１、９１１Ｂ…径方向流路部、９１２…軸方向流路部、Ｊ２…中心軸線、Ｏ…流体

  DESCRIPTION OF SYMBOLS 1, 110, 110B... drive device, 2... motor, 6... housing, 20... rotor, 21... shaft, 24... rotor core, 28... end plate, 30... stator, 31... coil, 31a, 31b... coil end, 32 Stator core 61 Cylindrical portion 80 Accommodating space 91, 91B Flow path 281 First projecting portion (projecting portion) 282 Second projecting portion (projecting portion) 324 Cover member 324a Inner wall 324b Lid portion 324c Outer wall 911, 911B Radial channel portion 912 Axial channel portion J2 Central axis O Fluid

Claims (6)

  1. 　中心軸線を中心として回転するロータ、および前記ロータの径方向外側に位置するステータを有するモータと、
    　前記モータを収容する収容空間が設けられるハウジングと、
    　流体が流れる流路と、を備え、
    　前記ハウジングは、前記ステータを径方向外側から囲む筒状部を有し、
    　前記流路は、
    　　前記筒状部の壁内部を軸方向に延びる軸方向流路部と、
    　　前記軸方向流路部から径方向内側に延びて前記ステータに向けて開口する径方向流路部と、を有する、
    駆動装置。     a motor having a rotor rotating about a central axis and a stator positioned radially outward of the rotor;
    a housing provided with a housing space for housing the motor;
    a channel through which the fluid flows,
    The housing has a cylindrical portion surrounding the stator from the radial outside,
    The flow path is
    an axial flow path portion extending axially within the wall of the tubular portion;
    a radial flow path extending radially inward from the axial flow path and opening toward the stator;
    drive.
  2. 　前記ステータは、
    　　前記中心軸線を中心とする環状のステータコアと、
    　　前記ステータコアに取り付けられるコイルと、を有し、
    　前記径方向流路部は、前記ステータコアの外周面に向けて開口する、
    請求項１に記載の駆動装置。     The stator is
    an annular stator core centered on the central axis;
    a coil attached to the stator core;
    The radial flow path portion opens toward the outer peripheral surface of the stator core,
    2. The driving device according to claim 1.
  3. 　前記ステータは、
    　　前記中心軸線を中心とする環状のステータコアと、
    　　前記ステータコアに取り付けられるコイルと、を有し、
    　前記コイルは、前記ステータコアから軸方向に突出するコイルエンドを有し、
    　前記径方向流路部は、前記コイルエンドに向けて開口する、
    請求項１に記載の駆動装置。     The stator is
    an annular stator core centered on the central axis;
    a coil attached to the stator core;
    the coil has a coil end projecting axially from the stator core,
    The radial flow path portion opens toward the coil end,
    2. The driving device according to claim 1.
  4. 　前記ステータは、前記コイルエンドを覆うカバー部材を有する、
    請求項３に記載の駆動装置。     The stator has a cover member that covers the coil end,
    4. The driving device according to claim 3.
  5. 　前記コイルエンドは、前記中心軸線を中心とする環状であり、
    　前記カバー部材は、
    　　前記コイルエンドを径方向内側から覆う内壁と、
    　　前記コイルエンドを軸方向から覆う蓋部と、を有する、
    請求項４に記載の駆動装置。     The coil end has an annular shape centered on the central axis,
    The cover member is
    an inner wall that covers the coil end from the radially inner side;
    a lid portion that axially covers the coil end;
    5. The driving device according to claim 4.
  6. 　前記カバー部材は、前記コイルエンドを径方向外側から覆う外壁を有する、
    請求項５に記載の駆動装置。

          The cover member has an outer wall that covers the coil end from the radial outside,
    6. A driving device according to claim 5.
PCT/JP2023/003585 2022-02-03 2023-02-03 Drive device WO2023149551A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014107905A (en) * 2012-11-26 2014-06-09 Mitsubishi Motors Corp Rotary electric machine
JP2015033299A (en) * 2013-08-06 2015-02-16 日産自動車株式会社 Cooling structure of stator coil and manufacturing method of the same
JP2015095908A (en) * 2013-11-08 2015-05-18 株式会社ジェイテクト Electric motor
JP2019154146A (en) * 2018-03-02 2019-09-12 本田技研工業株式会社 Rotary electric machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014107905A (en) * 2012-11-26 2014-06-09 Mitsubishi Motors Corp Rotary electric machine
JP2015033299A (en) * 2013-08-06 2015-02-16 日産自動車株式会社 Cooling structure of stator coil and manufacturing method of the same
JP2015095908A (en) * 2013-11-08 2015-05-18 株式会社ジェイテクト Electric motor
JP2019154146A (en) * 2018-03-02 2019-09-12 本田技研工業株式会社 Rotary electric machine

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