WO2019131454A1 - Motor unit - Google Patents

Motor unit Download PDF

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Publication number
WO2019131454A1
WO2019131454A1 PCT/JP2018/047081 JP2018047081W WO2019131454A1 WO 2019131454 A1 WO2019131454 A1 WO 2019131454A1 JP 2018047081 W JP2018047081 W JP 2018047081W WO 2019131454 A1 WO2019131454 A1 WO 2019131454A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
gear
oil
housing
pump
Prior art date
Application number
PCT/JP2018/047081
Other languages
French (fr)
Japanese (ja)
Inventor
崇宣 小山
勇樹 石川
Original Assignee
日本電産株式会社
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 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN202210755968.XA priority Critical patent/CN114915075A/en
Priority to CN202210756182.XA priority patent/CN114928193A/en
Priority to CN201880084227.5A priority patent/CN111557070B/en
Priority to CN202210756116.2A priority patent/CN114899974A/en
Priority to CN202210756066.8A priority patent/CN114928192A/en
Publication of WO2019131454A1 publication Critical patent/WO2019131454A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears

Definitions

  • the present invention relates to a motor unit.
  • Japanese Patent Laid-Open Publication No. 2016-73163 discloses that a refrigerant is cooled by a cooling device (cooler) provided outside the motor (rotating electric machine), and a pump provided outside the motor is used to cool the refrigerant A delivery structure is disclosed.
  • one aspect of the present invention aims to provide a motor unit that can be miniaturized as a whole.
  • One aspect of the motor unit according to the present invention is a motor having a motor shaft rotating about a motor shaft extending along a horizontal direction, and a gear portion connected to the motor shaft on one side in the axial direction of the motor shaft. And a housing for housing the motor and the gear portion, and oil stored in the housing.
  • the housing has a motor housing portion in which a motor chamber housing the motor is provided, and a gear housing portion in which a gear chamber housing the gear portion is provided.
  • the housing is provided with an oil passage for circulating the oil and cooling the motor. In the path of the oil passage, a cooler for cooling the oil passing through the oil passage and a pump for supplying the oil to the motor are provided.
  • the gear housing portion has a protruding portion which protrudes in the radial direction of the motor shaft with respect to the motor housing portion when viewed from the axial direction of the motor shaft.
  • the cooler and the pump at least partially overlap the overhang when viewed in the axial direction of the motor shaft.
  • a motor unit that can be miniaturized as a whole.
  • FIG. 1 is a conceptual view of a motor unit according to one embodiment.
  • FIG. 2 is a perspective view of a motor unit according to an embodiment.
  • FIG. 3 is a schematic side view of a motor unit according to an embodiment.
  • FIG. 4 is an exploded view of the housing of one embodiment.
  • FIG. 5 is a side view of the motor unit of one embodiment.
  • FIG. 6 is a bottom view of the motor unit according to the embodiment as viewed from below.
  • an XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system as appropriate.
  • the Z-axis direction indicates the vertical direction (that is, the vertical direction)
  • the + Z direction is the upper side (opposite the gravity direction)
  • the -Z direction is the lower side (gravity direction).
  • the X-axis direction is a direction orthogonal to the Z-axis direction, and indicates the front-rear direction of the vehicle on which the motor unit 1 is mounted.
  • the + X direction is the vehicle front
  • the ⁇ X direction is the vehicle rear.
  • the + X direction may be the rear of the vehicle and the ⁇ X direction may be the front 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 (left-right direction) of the vehicle, the + Y direction is the vehicle left, and the -Y direction is the vehicle right It is.
  • the + X direction is the rear of the vehicle
  • the + Y direction may be the right of the vehicle and the ⁇ Y direction may be the left of the vehicle. That is, regardless of the direction of the X axis, the + Y direction is simply one side in the vehicle left-right direction, and the ⁇ Y direction is the other side in the vehicle left-right direction.
  • the direction (Y-axis direction) parallel to the motor axis J2 of the motor 2 is simply referred to as “axial direction”, and the radial direction centered on the motor axis J2 is simply referred to as “radial direction”.
  • the circumferential direction around the motor axis J2, that is, around the axis of the motor axis J2, is simply referred to as "circumferential direction”.
  • parallel direction also includes a substantially parallel direction.
  • FIG. 1 is a conceptual view of a motor unit 1 according to an embodiment.
  • FIG. 2 is a perspective view of the motor unit 1.
  • FIG. 1 is a conceptual diagram to the last, and arrangement
  • the motor unit 1 is mounted on a vehicle having a motor as a power source such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), and used as the power source.
  • a motor as a power source
  • HEV hybrid vehicle
  • PHY plug-in hybrid vehicle
  • EV electric vehicle
  • the motor unit 1 includes a motor (main motor) 2, a gear portion 3, a housing 6, oil O housed in the housing 6, an inverter unit 8, and a parking mechanism 7, Equipped with
  • the motor 2 includes a rotor 20 rotating around a motor axis J 2 extending in the horizontal direction, and a stator 30 located radially outward of the rotor 20.
  • An interior of the housing 6 is provided with an accommodation space 80 for accommodating the motor 2 and the gear portion 3.
  • the housing space 80 is divided into a motor chamber 81 for housing the motor 2 and a gear chamber 82 for housing the gear portion 3.
  • the motor 2 is accommodated in a motor chamber 81 of the housing 6.
  • the motor 2 includes a rotor 20 and a stator 30 located radially outward of the rotor 20.
  • the motor 2 is an inner rotor type motor including a stator 30 and a rotor 20 rotatably disposed inside the stator 30.
  • the rotor 20 rotates by supplying power to the stator 30 from a battery (not shown).
  • the rotor 20 has a shaft (motor shaft) 21, a rotor core 24, and a rotor magnet (not shown).
  • the rotor 20 i.e., the shaft 21, the rotor core 24, and the rotor magnet
  • the torque of the rotor 20 is transmitted to the gear portion 3.
  • the shaft 21 extends around a motor axis J2 extending in the horizontal direction and the width direction of the vehicle.
  • the shaft 21 rotates about the motor axis J2.
  • the shaft 21 is a hollow shaft provided with a hollow portion 22 having an inner circumferential surface extending along the motor axis J2.
  • the shaft 21 extends across the motor chamber 81 and the gear chamber 82 of the housing 6. One end of the shaft 21 protrudes toward the gear chamber 82. A first gear 41 is fixed to an end of the shaft 21 projecting into the gear chamber 82.
  • the rotor core 24 is configured by laminating silicon steel plates.
  • the rotor core 24 is a cylindrical body extending along the axial direction.
  • a plurality of rotor magnets (not shown) are fixed to the rotor core 24.
  • the plurality of rotor magnets are arranged along the circumferential direction with the magnetic poles alternately.
  • the stator 30 surrounds the rotor 20 from the radially outer side.
  • the stator 30 has a stator core 32, a coil 31, and an insulator (not shown) interposed between the stator core 32 and the coil 31.
  • the stator 30 is held by the housing 6.
  • the stator core 32 has a plurality of magnetic pole teeth (not shown) radially inward from the inner circumferential surface of the annular yoke.
  • a coil wire is wound around the pole teeth.
  • the coil wire wound around the pole teeth constitutes a coil 31.
  • the coil wire is connected to the inverter unit 8 via a bus bar (not shown).
  • the coil 31 has a coil end 31 a protruding from the axial end surface of the stator core 32.
  • the coil end 31 a protrudes in the axial direction more than the end of the rotor core 24 of the rotor 20.
  • the coil end 31 a protrudes on both sides in the axial direction with respect to the rotor
  • the gear portion 3 is accommodated in a gear chamber 82 of the housing 6.
  • the gear portion 3 is connected to the shaft 21 on one side in the axial direction of the motor shaft J2.
  • the gear portion 3 has a reduction gear 4 and a differential device 5. The torque output from the motor 2 is transmitted to the differential 5 via the reduction gear 4.
  • the reduction gear 4 is connected to the rotor 20 of the motor 2.
  • the reduction gear 4 has a function of reducing the rotational speed of the motor 2 and increasing the torque output from the motor 2 according to the reduction ratio.
  • the reduction gear 4 transmits the torque output from the motor 2 to the differential 5.
  • the reduction gear 4 has a first gear (intermediate drive gear) 41, a second gear (intermediate gear) 42, a third gear (filed drive gear) 43, and an intermediate shaft 45.
  • the torque output from the motor 2 is transmitted to the ring gear (gear) 51 of the differential 5 through the shaft 21 of the motor 2, the first gear 41, the second gear 42, the intermediate shaft 45 and the third gear 43. It is transmitted.
  • the gear ratio of each gear, the number of gears, etc. can be variously changed according to the required reduction ratio.
  • the reduction gear 4 is a reduction gear of a parallel axis gear type in which axes of the respective gears are arranged in parallel.
  • the first gear 41 is provided on the outer peripheral surface of the shaft 21 of the motor 2.
  • the first gear 41 rotates with the shaft 21 about the motor axis J2.
  • the intermediate shaft 45 extends along an intermediate axis J4 parallel to the motor axis J2.
  • the middle shaft 45 rotates around the middle axis J4.
  • the second gear 42 and the third gear 43 are provided on the outer peripheral surface of the intermediate shaft 45.
  • the second gear 42 and the third gear 43 are connected via an intermediate shaft 45.
  • the second gear 42 and the third gear 43 rotate around the intermediate shaft J4.
  • the second gear 42 meshes with the first gear 41.
  • the third gear 43 meshes with the ring gear 51 of the differential device 5.
  • the third gear 43 is located on the side of the partition wall 61 c with respect to the second gear 42.
  • the differential device 5 is connected to the motor 2 via the reduction gear 4.
  • the differential 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle.
  • the differential device 5 has a function of transmitting the same torque to the axles 55 of the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle is turning.
  • the differential 5 has a ring gear 51, a gear housing (not shown), a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown).
  • the ring gear 51 rotates about a differential axis J5 parallel to the motor axis J2.
  • the torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4. That is, the ring gear 51 is connected to the motor 2 through another gear.
  • FIG. 3 is a schematic side view of the motor unit 1.
  • the motor axis J2, the intermediate axis J4 and the differential axis J5 extend parallel to one another along the horizontal direction.
  • the intermediate shaft J4 and the differential shaft J5 are located below the motor shaft J2. Therefore, the reduction gear 4 and the differential 5 are located below the motor 2.
  • a line segment virtually connecting the motor axis J2 and the intermediate axis J4 is a first line segment L1 when viewed from the axial direction of the motor axis J2, and a line segment virtually connecting the intermediate axis J4 and the differential axis J5 Is a second line segment L2, and a line segment that virtually connects the motor axis J2 and the differential axis J5 is a third line segment L3.
  • the second line segment L2 extends along the substantially horizontal direction. That is, the intermediate shaft J4 and the differential shaft J5 are aligned substantially in the horizontal direction.
  • the substantially horizontal direction of the second line segment L2 is a direction within ⁇ 10 ° with respect to the horizontal direction.
  • An angle ⁇ between the second line segment L2 and the third line segment L3 is 30 ° ⁇ 5 °.
  • the first line segment L1 extends substantially in the vertical direction. That is, the motor shaft J2 and the intermediate shaft J4 are aligned along the substantially vertical direction.
  • the substantially vertical direction of the first line segment L1 is a direction within ⁇ 10 ° with respect to the vertical direction.
  • the length L1 of the first line segment, the length L2 of the second line segment, and the length L3 of the third line segment satisfy the following relationship.
  • L1: L2: L3 1: 1.4 to 1.7: 1.8 to 2.0
  • the reduction ratio in the reduction mechanism from the motor 2 to the differential 5 is 8 or more and 11 or less.
  • a desired gear ratio (8 or more and 11 or less) can be realized while maintaining the positional relationship between the motor shaft J2, the intermediate shaft J4, and the differential shaft J5 as described above.
  • the motor 2 and the gear portion 3 are housed in a housing space 80 provided inside the housing 6.
  • the housing 6 holds the motor 2 and the gear portion 3 in the housing space 80.
  • the housing 6 has a partition wall 61c.
  • the housing space 80 of the housing 6 is divided into a motor chamber 81 and a gear chamber 82 by a partition wall 61 c.
  • the motor 2 is accommodated in the motor chamber 81.
  • the gear chamber 3 accommodates the gear portion 3 (i.e., the reduction gear 4 and the differential 5).
  • An oil reservoir P in which oil O is accumulated is provided in a lower region in the accommodation space 80.
  • the bottom 81 a of the motor chamber 81 is located above the bottom 82 a of the gear chamber 82.
  • a partition wall opening 68 is provided in the partition wall 61 c that divides the motor chamber 81 and the gear chamber 82. The partition opening 68 brings the motor chamber 81 and the gear chamber 82 into communication with each other. The partition opening 68 moves the oil O accumulated in the lower region in the motor chamber 81 to the gear chamber 82.
  • a part of the differential device 5 is immersed in the oil reservoir P.
  • the oil O accumulated in the oil reservoir P is scooped up by the operation of the differential device 5 and a portion is supplied to the first oil passage 91 and a portion is diffused into the gear chamber 82.
  • the oil O diffused to the gear chamber 82 is supplied to the gears of the reduction gear 4 and the differential gear 5 in the gear chamber 82 and spreads the oil O on the tooth surfaces of the gears.
  • the oil O used in the reduction gear 4 and the differential device 5 drips and is collected in an oil reservoir P located below the gear chamber 82.
  • the capacity of the oil reservoir P of the housing space 80 is such that part of the bearing of the differential gear 5 is immersed in the oil O when the motor unit 1 is stopped.
  • the housing 6 has a first housing member 61, a second housing member 62, and a closing portion 63.
  • the second housing member 62 is located on one side in the axial direction of the first housing member 61.
  • the closing portion 63 is located on the other side of the first housing member 61 in the axial direction.
  • the housing may be composed of three or more members.
  • FIG. 4 is an exploded view of the housing 6.
  • the first housing member 61 has a cylindrical peripheral wall portion 61 a surrounding the motor 2 from the radial outer side, and a side plate portion 61 b located on one side in the axial direction of the peripheral wall portion 61 a.
  • a space inside the peripheral wall portion 61 a constitutes a motor chamber 81.
  • the side plate portion 61b has a partition wall 61c and a projecting plate portion 61d.
  • the partition wall 61c covers an opening on one side in the axial direction of the peripheral wall portion 61a.
  • the partition 61 c is provided with an insertion hole 61 f through which the shaft 21 of the motor 2 is inserted.
  • the side plate portion 61b has a partition wall 61c and a projecting plate portion 61d which protrudes outward in the radial direction with respect to the peripheral wall portion 61a.
  • the protruding plate portion 61d is provided with a first axle passage hole 61e through which a drive shaft (not shown) supporting the wheels passes.
  • the closing portion 63 is fixed to the peripheral wall portion 61 a of the first housing member 61.
  • the closing portion 63 closes the opening of the cylindrical first housing member 61.
  • the closing portion 63 has a closing portion main body 63a and a lid member 63b.
  • the closing portion main body 63a is provided with a window portion 63c penetrating in the axial direction.
  • the lid member 63 b closes the window 63 c from the outside of the accommodation space 80.
  • the second housing member 62 is fixed to the side plate portion 61 b of the first housing member 61.
  • the shape of the second housing member 62 is a concave shape that opens to the side plate portion 61 b side.
  • the opening of the second housing member 62 is covered by the side plate portion 61 b.
  • a space between the second housing member 62 and the side plate portion 61 b constitutes a gear chamber 82 accommodating the gear portion 3.
  • the second housing member 62 is provided with a second axle passage hole 62e.
  • the second axle passage hole 62e overlaps the first axle passage hole 61e when viewed in the axial direction.
  • the peripheral wall portion 61 a of the first housing member 61 and the closing portion 63 constitute a motor chamber 81, surround the motor 2, and accommodate the motor 2. That is, the peripheral wall portion 61a and the closing portion 63 constitute the motor housing portion 6a shown in FIG.
  • the side plate portion 61 b of the first housing member 61 and the second housing member 62 constitute a gear chamber 82, surround the gear portion 3, and accommodate the gear portion 3. That is, the side plate portion 61b and the second housing member 62 constitute the gear housing portion 6b shown in FIG.
  • the housing 6 has the motor housing portion 6 a in which the motor chamber 81 housing the motor 2 is provided, and the gear housing portion 6 b in which the gear chamber 82 housing the gear portion 3 is provided.
  • FIG. 5 is a side view of the motor unit 1.
  • FIG. 6 is a bottom view of the motor unit 1 as viewed from below. In FIG. 5 and FIG. 6, the illustration of the inverter unit 8 is omitted.
  • the gear housing portion 6b has a protruding portion 6d that protrudes in the radial direction with respect to the motor housing portion 6a when viewed from the axial direction.
  • the overhanging portion 6d projects to the rear side and the lower side of the motor housing portion 6a.
  • the overhanging portion 6 d accommodates a part of the gear portion 3. More specifically, a part of the second gear 42 and a part of the ring gear 51 are accommodated inside the overhanging part 6 d.
  • the oil O circulates in an oil passage 90 provided in the housing 6.
  • the oil path 90 is a path of oil O which supplies the oil O from the oil reservoir P to the motor 2.
  • the oil passage 90 circulates the oil O to cool the motor 2.
  • the oil O is used to lubricate the reduction gear 4 and the differential gear 5.
  • the oil O is also used for cooling the motor 2.
  • the oil O accumulates in the lower region (i.e., oil reservoir P) in the gear chamber 82. It is preferable to use an oil O equivalent to a low viscosity lubricating oil for automatic transmission (ATF: Automatic Transmission Fluid) in order to perform the functions of a lubricating oil and a cooling oil.
  • ATF Automatic Transmission Fluid
  • an oil passage 90 is provided in the housing 6.
  • the oil passage 90 is located in the housing space 80 in the housing 6.
  • the oil passage 90 is configured to straddle the motor chamber 81 and the gear chamber 82 of the accommodation space 80.
  • the oil passage 90 is a path of oil O that guides the oil O from the oil reservoir P on the lower side of the motor 2 (that is, the lower region in the accommodation space 80) through the motor 2 to the oil reservoir P on the lower side of the motor 2 again. It is.
  • the “oil passage” means a passage of oil O circulating in the storage space 80. Therefore, the “oil path” is not only a “flow path” that forms a steady flow of oil in one direction in a steady manner, but also a path (for example, a reservoir) for temporarily retaining oil and dripping oil It is a concept that also includes the route.
  • the oil passage 90 has a first oil passage 91 passing through the inside of the motor 2 and a second oil passage (oil passage) 92 passing through the outside of the motor 2.
  • the oil O cools the motor 2 from the inside and the outside in the first oil passage 91 and the second oil passage 92.
  • the first oil passage 91 and the second oil passage 92 are paths for supplying the oil O from the oil reservoir P to the motor 2 and recovering the oil O in the oil reservoir P again.
  • the oil O drips from the motor 2 and accumulates in the lower region in the motor chamber 81.
  • the oil O accumulated in the lower region in the motor chamber 81 moves to the lower region (i.e., the oil reservoir P) in the gear chamber 82 through the partition opening 68. That is, the first oil passage 91 and the second oil passage 92 include paths for moving the oil O from the lower region in the motor chamber 81 to the lower region in the gear chamber 82.
  • the first oil passage 91 has a scraping path 91a, a shaft supply path 91b, an in-shaft path 91c, and an in-rotor path 91d.
  • a first reservoir 93 is provided in the path of the first oil passage 91.
  • the first reservoir 93 is provided in the gear chamber 82.
  • the scraping path 91 a is a path for scraping the oil O from the oil reservoir P by the rotation of the ring gear 51 of the differential device 5 and receiving the oil O in the first reservoir 93.
  • the first reservoir 93 is disposed between the intermediate shaft J4 and the differential shaft J5.
  • the first reservoir 93 opens upward.
  • the first reservoir 93 receives the oil O picked up by the ring gear 51. Further, when the liquid level of the oil reservoir P is high immediately after the motor 2 is driven, etc., the oil stored in the first reservoir 93 is scraped up by the second gear 42 and the third gear 43 in addition to the ring gear 51. O also receive.
  • the shaft supply path 91 b guides the oil O from the first reservoir 93 to the motor 2.
  • the shaft supply path 91 b is constituted by a hole 94 provided in the second housing member 62.
  • the shaft inner path 91 c is a path through which the oil O passes in the hollow portion 22 of the shaft 21.
  • the rotor inner path 91 d is a path that passes through the inside of the rotor core 24 from the communication hole 23 of the shaft 21 and scatters to the stator 30.
  • the oil O that has reached the stator 30 removes heat from the stator 30.
  • the oil O which has cooled the stator 30 is dropped downward, and is accumulated in the lower region in the motor chamber 81.
  • the oil O accumulated in the lower region in the motor chamber 81 moves to the gear chamber 82 through the partition opening 68 provided in the partition 61 c.
  • the oil O is pulled up from the oil reservoir P to the upper side of the motor 2 in the second oil passage 92 and supplied to the motor 2.
  • the oil O supplied to the motor 2 takes heat from the stator 30 while cooling along the outer peripheral surface of the stator 30 to cool the motor 2.
  • the oil O transmitted along the outer peripheral surface of the stator 30 drips downward and accumulates in the lower region in the motor chamber 81.
  • the oil O of the second oil passage 92 merges with the oil O of the first oil passage 91 in the lower region of the motor chamber 81.
  • the oil O accumulated in the lower region in the motor chamber 81 moves to the lower region (i.e., the oil reservoir P) in the gear chamber 82 through the partition opening 68.
  • the second oil passage 92 has a first flow passage 92a, a second flow passage 92b, and a third flow passage 92c.
  • a pump 96, a cooler 97, and a second reservoir 98 are provided in the path of the second oil passage 92.
  • the pump 96 supplies oil O to the motor 2.
  • the cooler 97 also cools the oil O passing through the second oil passage 92.
  • the oil O passes through each portion in the order of the first passage 92a, the pump 96, the second passage 92b, the cooler 97, the third passage 92c, and the second reservoir 98. And supplied to the motor 2.
  • the first flow passage 92 a, the second flow passage 92 b and the third flow passage 92 c pass through the wall of the housing 6 surrounding the accommodation space 80.
  • the first flow path 92 a connects the oil reservoir P and the pump 96.
  • the second flow path 92 b connects the pump 96 and the cooler 97.
  • the third flow path 92 c connects the cooler 97 and the storage space 80.
  • the first flow passage 92 a, the second flow passage 92 b, and the third flow passage 92 c pass through the inside of the wall portion of the housing 6 surrounding the accommodation space 80. Therefore, it is not necessary to prepare a pipe separately, which can contribute to the reduction in the number of parts.
  • the pump 96 is an electric pump driven by electricity.
  • the pump 96 sucks up the oil O from the oil reservoir P via the first flow passage 92 a, and the motor 2 via the second flow passage 92 b, the cooler 97, the third flow passage 92 c and the second reservoir 98.
  • the pump 96 has a pump mechanism 96p, a pump motor 96m, an inlet 96a and an outlet 96b.
  • the pump mechanism portion 96p is a trochoidal pump in which an external gear (not shown) and an internal gear mesh with each other and rotate. The internal gear of the pump mechanism 96p is rotated by the pump motor 96m. The gap between the internal gear and the external gear of the pump mechanism portion 96p leads to the suction port 96a and the discharge port 96b.
  • the suction port 96a of the pump 96 is connected to the first flow passage 92a. Further, the discharge port 96 b of the pump 96 is connected to the second flow path 92 b.
  • the pump 96 sucks up the oil O from the oil reservoir P via the first flow passage 92 a, and the motor 2 via the second flow passage 92 b, the cooler 97, the third flow passage 92 c and the second reservoir 98.
  • the pump motor 96m rotates the internal gear of the pump mechanism 96p.
  • the rotation axis J6 of the pump motor 96m is parallel to the motor axis J2.
  • the pump 96 having the pump motor 96m tends to be long in the direction of the rotation axis J6.
  • the pump 96 by making the rotation axis J6 of the pump motor 96m parallel to the motor axis J2, it is possible to reduce the size of the motor unit 1 in the radial direction.
  • the pump 96 can be easily disposed so as to overlap the overhanging portion 6 d of the housing 6 as viewed from the axial direction. As a result, it is possible to realize a structure in which the motor unit 1 can be easily miniaturized by suppressing an increase in the projected area in the axial direction of the motor unit 1.
  • the pump 96 is located below the motor chamber 81.
  • the pump 96 is fixed to the surface of the overhang 6 d facing the motor housing 6 a.
  • the suction port 96a of the pump 96 is disposed to face the overhang 6d.
  • the first flow passage 92 a connected to the suction port 96 a of the pump 96 linearly penetrates the wall surface of the overhang portion 6 d in the axial direction and opens in the lower region in the gear chamber 82. That is, the overhanging portion 6 d is provided with a first flow passage 92 a which extends along the axial direction and is connected to the pump 96 from the lower region (i.e., oil reservoir P) in the gear chamber 82.
  • the suction port 96a can be easily disposed near the oil reservoir P.
  • the first flow path 92a connecting the oil reservoir P and the suction port 96a can be shortened.
  • the first flow path 92a can be made a linear flow path.
  • the cooler 97 is connected to a first flow passage 92 a and a second flow passage 92 b.
  • the first flow path 92 a and the second flow path 92 b are connected via the internal flow path of the cooler 97.
  • Connected to the cooler 97 is a cooling water pipe 97j that allows the cooling water cooled by a radiator (not shown) to pass.
  • the oil O passing through the inside of the cooler 97 is cooled by heat exchange with the cooling water passing through the cooling water pipe 97j.
  • An inverter unit 8 is provided in the path of the cooling water pipe 97j. The cooling water passing through the cooling water pipe 97j cools the inverter unit 8.
  • the cooler 97 is fixed to the outer peripheral surface of the motor housing portion 6 a facing the radially outer side on the lower side of the motor chamber 81.
  • the oil O supplied to the motor 2 temporarily accumulates in the lower region in the motor chamber 81 and then moves to the lower region in the gear chamber 82 through the partition opening 68.
  • the cooler 97 since the cooler 97 is fixed to the outer peripheral surface of the motor housing 6a below the motor chamber 81, the motor chamber 81 from the installation surface of the cooler 97 via the wall surface of the motor housing 6a. The oil O accumulated in the lower region of the inside can be cooled.
  • the cooler 97 and the pump 96 at least partially overlap the overhanging portion 6 d of the gear housing portion 6 b when viewed in the axial direction.
  • the gear portion 3 is accommodated inside the overhang portion 6 d.
  • the projected area in the axial direction of the overhang portion 6 d is determined depending on the size of each gear of the gear portion 3.
  • the size of each gear constituting the gear portion 3 is set to satisfy a desired gear ratio. For this reason, it is difficult to reduce the projected area in the axial direction of the overhang portion 6d.
  • the motor unit 1 can be miniaturized while suppressing an increase in the projected area in the axial direction of the motor unit 1.
  • the cooler 97 and the pump 96 at least partially overlap the second gear 42 of the gear portion 3 as viewed in the axial direction. Therefore, even if the projected area of the overhang 6d as viewed in the axial direction is as small as possible along the outline of each gear of the gear portion 3, the cooler 97 and the pump 96 overhang as viewed from the axial direction A configuration overlapping with 6d can be realized. As a result, it is possible to miniaturize the motor unit 1 while suppressing an increase in the projected area in the axial direction of the motor unit 1.
  • the cooler 97 and the pump 96 are located above the lower end of the overhang 6 d. That is, the cooler 97 and the pump 96 do not protrude further downward from the lower end of the overhang 6 d. For this reason, the motor unit 1 can be miniaturized in the vertical direction.
  • the cooler 97 and the pump 96 are located below the motor chamber 81 in the vertical direction.
  • the motor unit 1 is disposed, for example, in a hood of a vehicle. Further, in the motor unit 1, the cooler 97 and the pump 96 are projections that project relative to the housing 6. According to the present embodiment, by disposing the cooler 97 and the pump 96 below the motor chamber 81 in the vertical direction, even if the vehicle collides with the object due to an accident or the like, the cooler 97 which is a protrusion can be The pump 96 can suppress sticking to an object.
  • the pump 96 and the cooler 97 are fixed to the outer peripheral surface of the housing 6. For this reason, as compared with the case where the pump 96 and the cooler 97 are fixed to a structure outside the housing 6, the motor unit 1 can be reduced in size.
  • the pump 96 and the cooler 97 are fixed to the outer peripheral surface of the housing 6, whereby the first flow passage 92a, the second flow passage 92b and the third flow passage 92c passing through the wall of the housing 6
  • a flow path connecting the housing space 80, the pump 96 and the cooler 97 can be configured.
  • the position of the pump 96 in the axial direction and the position of the cooler 97 overlap each other.
  • the cooler 97 and the pump 96 are connected via the second flow path 92b. That is, the second oil passage 92 is provided with a second flow passage 92 b connecting the pump 96 and the cooler 97.
  • the axial positions of the pump 96 and the cooler 97 overlap with each other, so that it is possible to realize a structure in which the second flow path 92b linearly extends in the direction orthogonal to the axial direction. That is, the second flow path 92b can be made a linear short flow path, pressure loss in the path from the pump 96 to the cooler 97 can be reduced, and efficient oil O circulation can be realized.
  • the second reservoir 98 is located in the motor chamber 81 of the accommodation space 80.
  • the second reservoir 98 is located above the motor.
  • the second reservoir 98 stores the oil O supplied to the motor chamber 81 via the third flow path 92c.
  • the second reservoir 98 has a plurality of outlets 98a.
  • the oil O accumulated in the second reservoir 98 is supplied to the motor 2 from each outlet 98 a.
  • the oil O flowing out from the outlet 98 a of the second reservoir 98 flows from the upper side to the lower side along the outer peripheral surface of the motor 2 to remove the heat of the motor 2. Thereby, the whole motor 2 can be cooled.
  • the second reservoir 98 extends along the axial direction. Also, the outlets 98 a of the second reservoir 98 are provided at both axial ends of the second reservoir 98. The outlet 98a is located above the coil end 31a. As a result, it is possible to apply oil O to the coil ends 31 a located at both axial ends of the stator 30 to directly cool the coils 31.
  • the oil O which has cooled the coil 31 is dropped downward, and is accumulated in the lower region in the motor chamber 81.
  • the oil O accumulated in the lower region in the motor chamber 81 moves to the gear chamber 82 through the partition opening 68 provided in the partition 61 c.
  • a cooler 97 for cooling the oil O is provided in the path of the second oil passage 92.
  • the oil O passing through the second oil passage 92 and cooled by the cooler 97 merges with the oil O passing through the first oil passage 91 in the oil reservoir P.
  • the oil O which has passed through the first oil passage 91 and the second oil passage 92 is mixed with each other to perform heat exchange. For this reason, the oil O which is disposed in the path of the second oil passage 92 and has the effect of cooling the cooler 97 can also be exerted on the oil O passing through the first oil passage 91.
  • Inverter unit 8 is electrically connected to motor 2.
  • the inverter unit 8 controls the current supplied to the motor 2.
  • the inverter unit 8 is fixed to the housing 6. More specifically, inverter unit 8 is fixed to the outer peripheral surface facing the radially outer side of motor housing 6a.
  • the inverter unit 8 When viewed in the axial direction, at least a portion of the inverter unit 8 overlaps the overhanging portion 6 d of the gear housing portion 6 b. According to the present embodiment, by arranging the inverter unit 8 so as to overlap the overhang portion 6 d when viewed from the axial direction, it is possible to suppress the increase in the projection area in the axial direction of the motor unit 1 due to the inverter unit 8. . As a result, the motor unit 1 can be miniaturized while suppressing an increase in the projected area in the axial direction of the motor unit 1.
  • the inverter unit 8 overlaps the ring gear 51 of the gear portion 3 when viewed in the axial direction. Therefore, even if the projected area of the overhang 6d viewed in the axial direction is made as small as possible along the outer shape of each gear of the gear portion 3, the inverter unit 8 is not An overlapping configuration can be realized. As a result, it is possible to miniaturize the motor unit 1 while suppressing an increase in the projected area in the axial direction of the motor unit 1.
  • the inverter unit 8 is located on the opposite side of the cooler 97 with respect to the motor axis J2 when viewed from the vertical direction. For this reason, it is possible to reduce the dimension along the horizontal direction of the motor unit 1 by effectively utilizing the region overlapping with the overhanging portion 6 d when viewed from the axial direction, thereby achieving downsizing of the motor unit 1. it can.
  • a cooling water pipe 97 j extending from a radiator (not shown) is connected to the inverter unit 8.
  • the inverter unit 8 can be cooled efficiently.
  • the cooling water flowing through the cooling water pipe 97 j also cools the motor housing portion 6 a which contacts the housing portion via the housing portion of the inverter unit 8.
  • the parking mechanism 7 moves between the teeth of the parking gear 71 fixed to the intermediate shaft 45 and rotating around the intermediate shaft J4 with the intermediate shaft 45 and rotates the parking gear 71. It has the rotation prevention part 72 to block, and the parking motor 73 which drives the rotation prevention part 72.
  • rotation prevention unit 72 retracts from parking gear 71.
  • the parking motor 73 moves the rotation preventing portion 72 between the teeth of the parking gear 71 to prevent the parking gear 71 from rotating.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

This motor unit is provided with: a motor having a motor shaft rotating about a horizontally extending motor axis; a gear section connected to one side, in the direction of the motor axis, of the motor shaft; a housing which contains the motor and the gear section; and oil contained in the housing. The housing has a motor containing section having provided therein a motor chamber which contains the motor; and a gear containing section having provided therein a gear chamber which contains the gear section. The housing is provided with an oil passage through which oil is circulated to cool the motor. The oil passage has provided therein: a cooler which cools oil flowing through the oil passage; and a pump which supplies oil to the motor. The gear containing section has, when viewed in the direction of the motor axis, a protrusion protruding in the radial direction of the motor axis relative to the motor containing section. At least portions of the cooler and the pump overlap the protrusion when viewed in the direction of the motor axis.

Description

モータユニットMotor unit
　本発明は、モータユニットに関する。 The present invention relates to a motor unit.
　日本国公開公報：特開２０１６－７３１６３号公報には、モータ（回転電機）の外部に設けられた冷却装置（クーラー）により冷媒を冷却し、モータの外部に設けられたポンプによって冷媒をモータに供給する構造が開示されている。 Japanese Patent Laid-Open Publication No. 2016-73163 discloses that a refrigerant is cooled by a cooling device (cooler) provided outside the motor (rotating electric machine), and a pump provided outside the motor is used to cool the refrigerant A delivery structure is disclosed.
日本国公開公報：特開２０１６－７３１６３号公報Japanese Patent Publication: JP-A-2016-73163
　近年、モータに変速装置などを取り付けた車両用のモータユニットの開発が進んでいる。このようなモータユニットは、複雑な外形形状を有するために、車両に搭載する際にデッドスペースが生じやすいという問題がった。 In recent years, development of a motor unit for a vehicle in which a transmission or the like is attached to a motor has been advanced. Since such a motor unit has a complicated outer shape, there is a problem that a dead space is easily generated when mounted on a vehicle.
　本発明の一つの態様は、上記問題点に鑑みて、全体の小型化を図ることができるモータユニットの提供を目的の一つとする。 SUMMARY OF THE INVENTION In view of the above-described problems, one aspect of the present invention aims to provide a motor unit that can be miniaturized as a whole.
　本発明のモータユニットの一つの態様は、水平方向に沿って延びるモータ軸を中心として回転するモータシャフトを有するモータと、前記モータ軸の軸方向一方側において前記モータシャフトに接続されるギヤ部と、前記モータおよび前記ギヤ部を収容するハウジングと、前記ハウジング内に収容されるオイルと、を備える。前記ハウジングは、前記モータを収容するモータ室を内部に設けるモータ収容部と、前記ギヤ部を収容するギヤ室を内部に設けるギヤ収容部と、を有する。前記ハウジングには、前記オイルを循環させ前記モータを冷却する油路が設けられる。前記油路の経路中には、前記油路を通過する前記オイルを冷却するクーラーと、前記オイルを前記モータに供給するポンプと、が設けられる。前記ギヤ収容部は、前記モータ軸の軸方向から見て前記モータ収容部に対して前記モータ軸の径方向に張り出す張出部を有する。前記クーラーおよび前記ポンプは、前記モータ軸の軸方向から見て、少なくとも一部が前記張出部に重なる。 One aspect of the motor unit according to the present invention is a motor having a motor shaft rotating about a motor shaft extending along a horizontal direction, and a gear portion connected to the motor shaft on one side in the axial direction of the motor shaft. And a housing for housing the motor and the gear portion, and oil stored in the housing. The housing has a motor housing portion in which a motor chamber housing the motor is provided, and a gear housing portion in which a gear chamber housing the gear portion is provided. The housing is provided with an oil passage for circulating the oil and cooling the motor. In the path of the oil passage, a cooler for cooling the oil passing through the oil passage and a pump for supplying the oil to the motor are provided. The gear housing portion has a protruding portion which protrudes in the radial direction of the motor shaft with respect to the motor housing portion when viewed from the axial direction of the motor shaft. The cooler and the pump at least partially overlap the overhang when viewed in the axial direction of the motor shaft.
　本発明の一つの態様によれば、全体の小型化を図ることができるモータユニットが提供される。 According to one aspect of the present invention, there is provided a motor unit that can be miniaturized as a whole.
図１は、一実施形態のモータユニットの概念図である。FIG. 1 is a conceptual view of a motor unit according to one embodiment. 図２は、一実施形態のモータユニットの斜視図である。FIG. 2 is a perspective view of a motor unit according to an embodiment. 図３は、一実施形態のモータユニットの側面模式図である。FIG. 3 is a schematic side view of a motor unit according to an embodiment. 図４は、一実施形態のハウジングの分解図である。FIG. 4 is an exploded view of the housing of one embodiment. 図５は、一実施形態のモータユニットの側面図である。FIG. 5 is a side view of the motor unit of one embodiment. 図６は、一実施形態のモータユニットを下側から見た下面図である。FIG. 6 is a bottom view of the motor unit according to the embodiment as viewed from below.
　以下、図面を参照しながら、本発明の実施形態に係るモータユニットについて説明する。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。 Hereinafter, a motor unit according to an embodiment of the present invention will be described with reference to the drawings. 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、モータユニット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モータユニット１が搭載される車両の前後方向を示し、＋Ｘ方向が車両前方であり、－Ｘ方向が車両後方である。ただし、＋Ｘ方向が車両後方であり、－Ｘ方向が車両前方となることもありうる。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）を示し、＋Ｙ方向が車両左方であり、－Ｙ方向が車両右方である。但し、＋Ｘ方向が車両後方となる場合には、＋Ｙ方向が車両右方であり、－Ｙ方向が車両左方となることもありうる。すなわち、Ｘ軸の方向に関わらず、単に＋Ｙ方向が車両左右方向の一方側となり、－Ｙ方向が車両左右方向の他方側となる。 In the following description, the direction of gravity is defined and described based on the positional relationship when the motor unit 1 is mounted on a vehicle located on a horizontal road surface. In the drawings, an XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system as appropriate. 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 (opposite the gravity direction), and the -Z direction is the lower side (gravity direction). The X-axis direction is a direction orthogonal to the Z-axis direction, and indicates the front-rear direction of the vehicle on which the motor unit 1 is mounted. The + X direction is the vehicle front, and the −X direction is the vehicle rear. However, the + X direction may be the rear of the vehicle and the −X direction may be the front 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 (left-right direction) of the vehicle, the + Y direction is the vehicle left, and the -Y direction is the vehicle right It is. However, when the + X direction is the rear of the vehicle, the + Y direction may be the right of the vehicle and the −Y direction may be the left of the vehicle. That is, regardless of the direction of the X axis, the + Y direction is simply one side in the vehicle left-right direction, and the −Y direction is the other side in the vehicle left-right direction.
　以下の説明において特に断りのない限り、モータ２のモータ軸Ｊ２に平行な方向（Ｙ軸方向）を単に「軸方向」と呼び、モータ軸Ｊ２を中心とする径方向を単に「径方向」と呼び、モータ軸Ｊ２を中心とする周方向、すなわち、モータ軸Ｊ２の軸周りを単に「周方向」と呼ぶ。ただし、上記の「平行な方向」は、略平行な方向も含む。 Unless otherwise noted in the following description, the direction (Y-axis direction) parallel to the motor axis J2 of the motor 2 is simply referred to as “axial direction”, and the radial direction centered on the motor axis J2 is simply referred to as “radial direction”. The circumferential direction around the motor axis J2, that is, around the axis of the motor axis J2, is simply referred to as "circumferential direction". However, the above-mentioned "parallel direction" also includes a substantially parallel direction.
　以下、図面を基に本発明の例示的な一実施形態に係るモータユニット（電動駆動装置）１について説明する。
　図１は、一実施形態のモータユニット１の概念図である。図２は、モータユニット１の斜視図である。なお、図１は、あくまで概念図であり、各部の配置および寸法が実際と同じであるとは限らない。 Hereinafter, a motor unit (electric drive device) 1 according to an exemplary embodiment of the present invention will be described based on the drawings.
FIG. 1 is a conceptual view of a motor unit 1 according to an embodiment. FIG. 2 is a perspective view of the motor unit 1. In addition, FIG. 1 is a conceptual diagram to the last, and arrangement | positioning and the dimension of each part are not necessarily the same as actual.
　モータユニット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。 The motor unit 1 is mounted on a vehicle having a motor as a power source such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), and used as the power source.
　図１に示すように、モータユニット１は、モータ（メインモータ）２と、ギヤ部３と、ハウジング６と、ハウジング６内に収容されるオイルＯと、インバータユニット８と、パーキング機構７と、を備える。 As shown in FIG. 1, the motor unit 1 includes a motor (main motor) 2, a gear portion 3, a housing 6, oil O housed in the housing 6, an inverter unit 8, and a parking mechanism 7, Equipped with
　図１に示すように、モータ２は、水平方向に延びるモータ軸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、を備える。ハウジング６の内部は、モータ２およびギヤ部３を収容する収容空間８０が設けられる。収容空間８０は、モータ２を収容するモータ室８１と、ギヤ部３を収容するギヤ室８２と、に区画される。 As shown in FIG. 1, the motor 2 includes a rotor 20 rotating around a motor axis J 2 extending in the horizontal direction, and a stator 30 located radially outward of the rotor 20. An interior of the housing 6 is provided with an accommodation space 80 for accommodating the motor 2 and the gear portion 3. The housing space 80 is divided into a motor chamber 81 for housing the motor 2 and a gear chamber 82 for housing the gear portion 3.
　＜モータ＞
　モータ２は、ハウジング６のモータ室８１に収容される。モータ２は、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、を備える。モータ２は、ステータ３０と、ステータ３０の内側に回転自在に配置されるロータ２０と、を備えるインナーロータ型モータである。 <Motor>
The motor 2 is accommodated in a motor chamber 81 of the housing 6. The motor 2 includes a rotor 20 and a stator 30 located radially outward of the rotor 20. The motor 2 is an inner rotor type motor including a stator 30 and a rotor 20 rotatably disposed inside the stator 30.
　ロータ２０は、図示略のバッテリからステータ３０に電力が供給されることで回転する。ロータ２０は、シャフト（モータシャフト）２１と、ロータコア２４と、ロータマグネット（図示略）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）は、水平方向に延びるモータ軸Ｊ２を中心として回転する。ロータ２０のトルクは、ギヤ部３に伝達される。 The rotor 20 rotates by supplying power to the stator 30 from a battery (not shown). The rotor 20 has a shaft (motor shaft) 21, a rotor core 24, and a rotor magnet (not shown). The rotor 20 (i.e., the shaft 21, the rotor core 24, and the rotor magnet) rotates about a horizontally extending motor axis J2. The torque of the rotor 20 is transmitted to the gear portion 3.
　シャフト２１は、水平方向かつ車両の幅方向に延びるモータ軸Ｊ２を中心として延びる。シャフト２１は、モータ軸Ｊ２を中心として回転する。シャフト２１は、内部にモータ軸Ｊ２に沿って延びる内周面を有する中空部２２が設けられた中空シャフトである。 The shaft 21 extends around a motor axis J2 extending in the horizontal direction and the width direction of the vehicle. The shaft 21 rotates about the motor axis J2. The shaft 21 is a hollow shaft provided with a hollow portion 22 having an inner circumferential surface extending along the motor axis J2.
　シャフト２１は、ハウジング６のモータ室８１とギヤ室８２とを跨いで延びる。シャフト２１の一方の端部は、ギヤ室８２側に突出する。ギヤ室８２に突出するシャフト２１の端部には、第１のギヤ４１が固定されている。 The shaft 21 extends across the motor chamber 81 and the gear chamber 82 of the housing 6. One end of the shaft 21 protrudes toward the gear chamber 82. A first gear 41 is fixed to an end of the shaft 21 projecting into the gear chamber 82.
　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、軸方向に沿って延びる円柱体である。ロータコア２４には、図示略の複数のロータマグネットが固定される。複数のロータマグネットは、磁極を交互にして周方向に沿って並ぶ。 The rotor core 24 is configured by laminating silicon steel plates. The rotor core 24 is a cylindrical body extending along the axial direction. A plurality of rotor magnets (not shown) are fixed to the rotor core 24. The plurality of rotor magnets are arranged along the circumferential direction with the magnetic poles alternately.
　ステータ３０は、ロータ２０を径方向外側から囲む。ステータ３０は、ステータコア３２と、コイル３１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。ステータコア３２は、円環状のヨークの内周面から径方向内方に複数の磁極歯（図示略）を有する。磁極歯の間には、コイル線が掛けまわされる。磁極歯に掛けまわされたコイル線は、コイル３１を構成する。コイル線は、図示略のバスバーを介してインバータユニット８に接続される。コイル３１は、ステータコア３２の軸方向端面から突出するコイルエンド３１ａを有する。コイルエンド３１ａは、ロータ２０のロータコア２４の端部よりも軸方向に突出する。コイルエンド３１ａは、ロータコア２４に対し軸方向両側に突出する。 The stator 30 surrounds the rotor 20 from the radially outer side. The stator 30 has a stator core 32, a coil 31, and an insulator (not shown) interposed between the stator core 32 and the coil 31. The stator 30 is held by the housing 6. The stator core 32 has a plurality of magnetic pole teeth (not shown) radially inward from the inner circumferential surface of the annular yoke. A coil wire is wound around the pole teeth. The coil wire wound around the pole teeth constitutes a coil 31. The coil wire is connected to the inverter unit 8 via a bus bar (not shown). The coil 31 has a coil end 31 a protruding from the axial end surface of the stator core 32. The coil end 31 a protrudes in the axial direction more than the end of the rotor core 24 of the rotor 20. The coil end 31 a protrudes on both sides in the axial direction with respect to the rotor core 24.
　＜ギヤ部＞
　ギヤ部３は、ハウジング６のギヤ室８２に収容される。ギヤ部３は、モータ軸Ｊ２の軸方向一方側においてシャフト２１に接続される。ギヤ部３は、減速装置４と差動装置５とを有する。モータ２から出力されるトルクは、減速装置４を介して差動装置５に伝達される。 <Gear part>
The gear portion 3 is accommodated in a gear chamber 82 of the housing 6. The gear portion 3 is connected to the shaft 21 on one side in the axial direction of the motor shaft J2. The gear portion 3 has a reduction gear 4 and a differential device 5. The torque output from the motor 2 is transmitted to the differential 5 via the reduction gear 4.
　＜減速装置＞
　減速装置４は、モータ２のロータ２０に接続される。減速装置４は、モータ２の回転速度を減じて、モータ２から出力されるトルクを減速比に応じて増大させる機能を有する。減速装置４は、モータ２から出力されるトルクを差動装置５へ伝達する。 <Reduction gear>
The reduction gear 4 is connected to the rotor 20 of the motor 2. The reduction gear 4 has a function of reducing the rotational speed of the motor 2 and increasing the torque output from the motor 2 according to the reduction ratio. The reduction gear 4 transmits the torque output from the motor 2 to the differential 5.
　減速装置４は、第１のギヤ（中間ドライブギヤ）４１と、第２のギヤ（中間ギヤ）４２と、第３のギヤ（ファイルナルドライブギヤ）４３と、中間シャフト４５と、を有する。モータ２から出力されるトルクは、モータ２のシャフト２１、第１のギヤ４１、第２のギヤ４２、中間シャフト４５および第３のギヤ４３を介して差動装置５のリングギヤ（ギヤ）５１へ伝達される。各ギヤのギヤ比およびギヤの個数等は、必要とされる減速比に応じて種々変更可能である。減速装置４は、各ギヤの軸芯が平行に配置される平行軸歯車タイプの減速機である。 The reduction gear 4 has a first gear (intermediate drive gear) 41, a second gear (intermediate gear) 42, a third gear (filed drive gear) 43, and an intermediate shaft 45. The torque output from the motor 2 is transmitted to the ring gear (gear) 51 of the differential 5 through the shaft 21 of the motor 2, the first gear 41, the second gear 42, the intermediate shaft 45 and the third gear 43. It is transmitted. The gear ratio of each gear, the number of gears, etc. can be variously changed according to the required reduction ratio. The reduction gear 4 is a reduction gear of a parallel axis gear type in which axes of the respective gears are arranged in parallel.
　第１のギヤ４１は、モータ２のシャフト２１の外周面に設けられる。第１のギヤ４１は、シャフト２１とともに、モータ軸Ｊ２を中心に回転する。中間シャフト４５は、モータ軸Ｊ２と平行な中間軸Ｊ４に沿って延びる。中間シャフト４５は、中間軸Ｊ４を中心として回転する。第２のギヤ４２および第３のギヤ４３は、中間シャフト４５の外周面に設けられる。第２のギヤ４２と第３のギヤ４３は、中間シャフト４５を介して接続される。第２のギヤ４２および第３のギヤ４３は、中間軸Ｊ４を中心として回転する。第２のギヤ４２は、第１のギヤ４１に噛み合う。第３のギヤ４３は、差動装置５のリングギヤ５１と噛み合う。第３のギヤ４３は、第２のギヤ４２に対して隔壁６１ｃ側に位置する。 The first gear 41 is provided on the outer peripheral surface of the shaft 21 of the motor 2. The first gear 41 rotates with the shaft 21 about the motor axis J2. The intermediate shaft 45 extends along an intermediate axis J4 parallel to the motor axis J2. The middle shaft 45 rotates around the middle axis J4. The second gear 42 and the third gear 43 are provided on the outer peripheral surface of the intermediate shaft 45. The second gear 42 and the third gear 43 are connected via an intermediate shaft 45. The second gear 42 and the third gear 43 rotate around the intermediate shaft J4. The second gear 42 meshes with the first gear 41. The third gear 43 meshes with the ring gear 51 of the differential device 5. The third gear 43 is located on the side of the partition wall 61 c with respect to the second gear 42.
　＜差動装置＞
　差動装置５は、減速装置４を介しモータ２に接続される。差動装置５は、モータ２から出力されるトルクを車両の車輪に伝達するための装置である。差動装置５は、車両の旋回時に、左右の車輪の速度差を吸収しつつ、左右両輪の車軸５５に同トルクを伝える機能を有する。差動装置５は、リングギヤ５１と、ギヤハウジング（不図示）と、一対のピニオンギヤ（不図示）と、ピニオンシャフト（不図示）と、一対のサイドギヤ（不図示）と、を有する。 <Differential device>
The differential device 5 is connected to the motor 2 via the reduction gear 4. The differential 5 is a device for transmitting the torque output from the motor 2 to the wheels of the vehicle. The differential device 5 has a function of transmitting the same torque to the axles 55 of the left and right wheels while absorbing the speed difference between the left and right wheels when the vehicle is turning. The differential 5 has a ring gear 51, a gear housing (not shown), a pair of pinion gears (not shown), a pinion shaft (not shown), and a pair of side gears (not shown).
　リングギヤ５１は、モータ軸Ｊ２と平行な差動軸Ｊ５を中心として回転する。リングギヤ５１には、モータ２から出力されるトルクが減速装置４を介して伝えられる。すなわち、リングギヤ５１は、他のギヤを介してモータ２に接続される。 The ring gear 51 rotates about a differential axis J5 parallel to the motor axis J2. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4. That is, the ring gear 51 is connected to the motor 2 through another gear.
　（各軸の配置）
　図３は、モータユニット１の側面模式図である。
　モータ軸Ｊ２、中間軸Ｊ４および差動軸Ｊ５は、水平方向に沿って互いに平行に延びる。モータ軸Ｊ２に対し中間軸Ｊ４および差動軸Ｊ５は、下側に位置する。したがって、減速装置４および差動装置５は、モータ２より下側に位置する。 (Arrangement of each axis)
FIG. 3 is a schematic side view of the motor unit 1.
The motor axis J2, the intermediate axis J4 and the differential axis J5 extend parallel to one another along the horizontal direction. The intermediate shaft J4 and the differential shaft J5 are located below the motor shaft J2. Therefore, the reduction gear 4 and the differential 5 are located below the motor 2.
　モータ軸Ｊ２の軸方向から見て、モータ軸Ｊ２と中間軸Ｊ４とを仮想的に結ぶ線分を第１の線分Ｌ１とし、中間軸Ｊ４と差動軸Ｊ５とを仮想的に結ぶ線分を第２の線分Ｌ２とし、モータ軸Ｊ２と差動軸Ｊ５とを仮想的に結ぶ線分を第３の線分Ｌ３とする。 A line segment virtually connecting the motor axis J2 and the intermediate axis J4 is a first line segment L1 when viewed from the axial direction of the motor axis J2, and a line segment virtually connecting the intermediate axis J4 and the differential axis J5 Is a second line segment L2, and a line segment that virtually connects the motor axis J2 and the differential axis J5 is a third line segment L3.
　第２の線分Ｌ２は、略水平方向に沿って延びる。すなわち、中間軸Ｊ４と差動軸Ｊ５は、略水平方向に並んでいる。なお、本実施形態において、第２の線分Ｌ２が略水平方向とは、水平方向に対して±１０°以内の方向である。
　第２の線分Ｌ２と第３の線分Ｌ３とのなす角αは、３０°±５°である。
　第１の線分Ｌ１は、略鉛直方向に沿って延びる。すなわち、モータ軸Ｊ２と中間軸Ｊ４は、略鉛直方向に沿って並んでいる。なお、本実施形態において、第１の線分Ｌ１が略鉛直方向とは、鉛直方向に対して±１０°以内の方向である。 The second line segment L2 extends along the substantially horizontal direction. That is, the intermediate shaft J4 and the differential shaft J5 are aligned substantially in the horizontal direction. In the present embodiment, the substantially horizontal direction of the second line segment L2 is a direction within ± 10 ° with respect to the horizontal direction.
An angle α between the second line segment L2 and the third line segment L3 is 30 ° ± 5 °.
The first line segment L1 extends substantially in the vertical direction. That is, the motor shaft J2 and the intermediate shaft J4 are aligned along the substantially vertical direction. In the present embodiment, the substantially vertical direction of the first line segment L1 is a direction within ± 10 ° with respect to the vertical direction.
　第１の線分の長さＬ１と、第２の線分の長さＬ２と、第３の線分の長さＬ３は、以下の関係を満たす。
　Ｌ１：Ｌ２：Ｌ３＝１：１．４～１．７：１．８～２．０
　また、モータ２から差動装置５に至る減速機構における減速比が８以上１１以下である。本実施形態によれば、上述したようなモータ軸Ｊ２、中間軸Ｊ４および差動軸Ｊ５の位置関係を維持しながら、所望のギヤ比（８以上１１以下）を実現できる。 The length L1 of the first line segment, the length L2 of the second line segment, and the length L3 of the third line segment satisfy the following relationship.
L1: L2: L3 = 1: 1.4 to 1.7: 1.8 to 2.0
Further, the reduction ratio in the reduction mechanism from the motor 2 to the differential 5 is 8 or more and 11 or less. According to this embodiment, a desired gear ratio (8 or more and 11 or less) can be realized while maintaining the positional relationship between the motor shaft J2, the intermediate shaft J4, and the differential shaft J5 as described above.
　＜ハウジング＞
　図１に示すように、ハウジング６の内部に設けられた収容空間８０には、モータ２およびギヤ部３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およびギヤ部３を保持する。ハウジング６は、隔壁６１ｃを有する。ハウジング６の収容空間８０は、隔壁６１ｃによってモータ室８１とギヤ室８２とに区画される。モータ室８１には、モータ２が収容される。ギヤ室８２には、ギヤ部３（すなわち、減速装置４および差動装置５）が収容される。 <Housing>
As shown in FIG. 1, the motor 2 and the gear portion 3 are housed in a housing space 80 provided inside the housing 6. The housing 6 holds the motor 2 and the gear portion 3 in the housing space 80. The housing 6 has a partition wall 61c. The housing space 80 of the housing 6 is divided into a motor chamber 81 and a gear chamber 82 by a partition wall 61 c. The motor 2 is accommodated in the motor chamber 81. The gear chamber 3 accommodates the gear portion 3 (i.e., the reduction gear 4 and the differential 5).
　収容空間８０内の下部領域には、オイルＯが溜るオイル溜りＰが設けられる。本実施形態では、モータ室８１の底部８１ａは、ギヤ室８２の底部８２ａより上側に位置する。また、モータ室８１とギヤ室８２とを区画する隔壁６１ｃには、隔壁開口６８が設けられる。隔壁開口６８は、モータ室８１とギヤ室８２とを連通させる。隔壁開口６８は、モータ室８１内の下部領域に溜ったオイルＯをギヤ室８２に移動させる。 An oil reservoir P in which oil O is accumulated is provided in a lower region in the accommodation space 80. In the present embodiment, the bottom 81 a of the motor chamber 81 is located above the bottom 82 a of the gear chamber 82. Further, a partition wall opening 68 is provided in the partition wall 61 c that divides the motor chamber 81 and the gear chamber 82. The partition opening 68 brings the motor chamber 81 and the gear chamber 82 into communication with each other. The partition opening 68 moves the oil O accumulated in the lower region in the motor chamber 81 to the gear chamber 82.
　オイル溜りＰには、差動装置５の一部が浸かる。オイル溜りＰに溜るオイルＯは、差動装置５の動作によってかき上げられて、一部が第１の油路９１に供給され、一部がギヤ室８２内に拡散される。ギヤ室８２に拡散されたオイルＯは、ギヤ室８２内の減速装置４および差動装置５の各ギヤに供給されてギヤの歯面にオイルＯを行き渡らせる。減速装置４および差動装置５に使用されたオイルＯは、滴下してギヤ室８２の下側に位置するオイル溜りＰに回収される。収容空間８０のオイル溜りＰの容量は、モータユニット１の停止時に、差動装置５の軸受の一部がオイルＯに浸かる程度である。 A part of the differential device 5 is immersed in the oil reservoir P. The oil O accumulated in the oil reservoir P is scooped up by the operation of the differential device 5 and a portion is supplied to the first oil passage 91 and a portion is diffused into the gear chamber 82. The oil O diffused to the gear chamber 82 is supplied to the gears of the reduction gear 4 and the differential gear 5 in the gear chamber 82 and spreads the oil O on the tooth surfaces of the gears. The oil O used in the reduction gear 4 and the differential device 5 drips and is collected in an oil reservoir P located below the gear chamber 82. The capacity of the oil reservoir P of the housing space 80 is such that part of the bearing of the differential gear 5 is immersed in the oil O when the motor unit 1 is stopped.
　図２に示すように、ハウジング６は、第１のハウジング部材６１と、第２のハウジング部材６２と、閉塞部６３と、を有する。第２のハウジング部材６２は、第１のハウジング部材６１の軸方向一方側に位置する。閉塞部６３は、第１のハウジング部材６１の軸方向他方側に位置する。ハウジングは３以上の部材で構成されてもよい。 As shown in FIG. 2, the housing 6 has a first housing member 61, a second housing member 62, and a closing portion 63. The second housing member 62 is located on one side in the axial direction of the first housing member 61. The closing portion 63 is located on the other side of the first housing member 61 in the axial direction. The housing may be composed of three or more members.
　図４は、ハウジング６の分解図である。
　第１のハウジング部材６１は、モータ２を径方向外側から囲む筒状の周壁部６１ａと、周壁部６１ａの軸方向一方側に位置する側板部６１ｂと、を有する。周壁部６１ａの内側の空間は、モータ室８１を構成する。側板部６１ｂは、隔壁６１ｃと突出板部６１ｄとを有する。隔壁６１ｃは、周壁部６１ａの軸方向一方側の開口を覆う。隔壁６１ｃには、上述の隔壁開口６８に加えて、モータ２のシャフト２１を挿通させる挿通孔６１ｆが設けられる。側板部６１ｂは、隔壁６１ｃと、周壁部６１ａに対して径方向外側に突出する突出板部６１ｄと、を有する。突出板部６１ｄには、車輪を支持するドライブシャフト（図示略）が通過する第１の車軸通過孔６１ｅが設けられる。 FIG. 4 is an exploded view of the housing 6.
The first housing member 61 has a cylindrical peripheral wall portion 61 a surrounding the motor 2 from the radial outer side, and a side plate portion 61 b located on one side in the axial direction of the peripheral wall portion 61 a. A space inside the peripheral wall portion 61 a constitutes a motor chamber 81. The side plate portion 61b has a partition wall 61c and a projecting plate portion 61d. The partition wall 61c covers an opening on one side in the axial direction of the peripheral wall portion 61a. In addition to the partition opening 68 described above, the partition 61 c is provided with an insertion hole 61 f through which the shaft 21 of the motor 2 is inserted. The side plate portion 61b has a partition wall 61c and a projecting plate portion 61d which protrudes outward in the radial direction with respect to the peripheral wall portion 61a. The protruding plate portion 61d is provided with a first axle passage hole 61e through which a drive shaft (not shown) supporting the wheels passes.
　閉塞部６３は、第１のハウジング部材６１の周壁部６１ａに固定される。閉塞部６３は、筒状の第１のハウジング部材６１の開口を塞ぐ。閉塞部６３は、閉塞部本体６３ａと、蓋部材６３ｂと、を有する。閉塞部本体６３ａには、軸方向に貫通する窓部６３ｃが設けられる。蓋部材６３ｂは、収容空間８０の外側から窓部６３ｃを塞ぐ。 The closing portion 63 is fixed to the peripheral wall portion 61 a of the first housing member 61. The closing portion 63 closes the opening of the cylindrical first housing member 61. The closing portion 63 has a closing portion main body 63a and a lid member 63b. The closing portion main body 63a is provided with a window portion 63c penetrating in the axial direction. The lid member 63 b closes the window 63 c from the outside of the accommodation space 80.
　第２のハウジング部材６２は、第１のハウジング部材６１の側板部６１ｂに固定される。第２のハウジング部材６２の形状は、側板部６１ｂ側に開口する凹形状である。第２のハウジング部材６２の開口は、側板部６１ｂに覆われる。第２のハウジング部材６２と側板部６１ｂの間との空間は、ギヤ部３を収容するギヤ室８２を構成する。第２のハウジング部材６２には、第２の車軸通過孔６２ｅが設けられる。第２の車軸通過孔６２ｅは、軸方向から見て第１の車軸通過孔６１ｅと重なる。 The second housing member 62 is fixed to the side plate portion 61 b of the first housing member 61. The shape of the second housing member 62 is a concave shape that opens to the side plate portion 61 b side. The opening of the second housing member 62 is covered by the side plate portion 61 b. A space between the second housing member 62 and the side plate portion 61 b constitutes a gear chamber 82 accommodating the gear portion 3. The second housing member 62 is provided with a second axle passage hole 62e. The second axle passage hole 62e overlaps the first axle passage hole 61e when viewed in the axial direction.
　第１のハウジング部材６１の周壁部６１ａと閉塞部６３とは、モータ室８１を構成し、モータ２を囲み、モータ２を収容する。すなわち、周壁部６１ａと閉塞部６３とは、図１に示すモータ収容部６ａを構成する。
　同様に、第１のハウジング部材６１の側板部６１ｂと第２のハウジング部材６２とは、ギヤ室８２を構成し、ギヤ部３を囲み、ギヤ部３を収容する。すなわち、側板部６１ｂと第２のハウジング部材６２とは、図１に示すギヤ収容部６ｂを構成する。
　このように、ハウジング６は、モータ２を収容するモータ室８１を内部に設けるモータ収容部６ａと、ギヤ部３を収容するギヤ室８２を内部に設けるギヤ収容部６ｂと、を有する。 The peripheral wall portion 61 a of the first housing member 61 and the closing portion 63 constitute a motor chamber 81, surround the motor 2, and accommodate the motor 2. That is, the peripheral wall portion 61a and the closing portion 63 constitute the motor housing portion 6a shown in FIG.
Similarly, the side plate portion 61 b of the first housing member 61 and the second housing member 62 constitute a gear chamber 82, surround the gear portion 3, and accommodate the gear portion 3. That is, the side plate portion 61b and the second housing member 62 constitute the gear housing portion 6b shown in FIG.
As described above, the housing 6 has the motor housing portion 6 a in which the motor chamber 81 housing the motor 2 is provided, and the gear housing portion 6 b in which the gear chamber 82 housing the gear portion 3 is provided.
　図５は、モータユニット１の側面図である。また、図６は、モータユニット１を下側から見た下面図である。なお、図５および図６において、インバータユニット８の図示を省略する。 FIG. 5 is a side view of the motor unit 1. FIG. 6 is a bottom view of the motor unit 1 as viewed from below. In FIG. 5 and FIG. 6, the illustration of the inverter unit 8 is omitted.
　図５および図６に示すように、ギヤ収容部６ｂは、軸方向から見てモータ収容部６ａに対し径方向に張り出す張出部６ｄを有する。本実施形態において、張出部６ｄは、モータ収容部６ａに対し車両後方側および下側に張り出す。張出部６ｄは、ギヤ部３の一部を収容する。より具体的には、張出部６ｄの内側には、第２のギヤ４２の一部と、リングギヤ５１の一部が収容される。 As shown in FIGS. 5 and 6, the gear housing portion 6b has a protruding portion 6d that protrudes in the radial direction with respect to the motor housing portion 6a when viewed from the axial direction. In the present embodiment, the overhanging portion 6d projects to the rear side and the lower side of the motor housing portion 6a. The overhanging portion 6 d accommodates a part of the gear portion 3. More specifically, a part of the second gear 42 and a part of the ring gear 51 are accommodated inside the overhanging part 6 d.
　＜オイル＞
　図１に示すように、オイルＯは、ハウジング６に設けられた油路９０内を循環する。油路９０は、オイル溜りＰからオイルＯをモータ２に供給するオイルＯの経路である。油路９０は、オイルＯを循環させモータ２を冷却する。
　オイルＯは、減速装置４および差動装置５の潤滑用として使用される。また、オイルＯは、モータ２の冷却用として使用される。オイルＯは、ギヤ室８２内の下部領域（すなわちオイル溜りＰ）に溜る。オイル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。 <Oil>
As shown in FIG. 1, the oil O circulates in an oil passage 90 provided in the housing 6. The oil path 90 is a path of oil O which supplies the oil O from the oil reservoir P to the motor 2. The oil passage 90 circulates the oil O to cool the motor 2.
The oil O is used to lubricate the reduction gear 4 and the differential gear 5. The oil O is also used for cooling the motor 2. The oil O accumulates in the lower region (i.e., oil reservoir P) in the gear chamber 82. It is preferable to use an oil O equivalent to a low viscosity lubricating oil for automatic transmission (ATF: Automatic Transmission Fluid) in order to perform the functions of a lubricating oil and a cooling oil.
　＜油路＞
　図１に示すように、油路９０は、ハウジング６に設けられる。油路９０は、ハウジング６内の収容空間８０に位置する。油路９０は、収容空間８０のモータ室８１とギヤ室８２とに跨って構成される。油路９０は、オイルＯをモータ２の下側のオイル溜りＰ（すなわち、収容空間８０内の下部領域）からモータ２を経て、再びモータ２の下側のオイル溜りＰに導くオイルＯの経路である。 <Oil path>
As shown in FIG. 1, an oil passage 90 is provided in the housing 6. The oil passage 90 is located in the housing space 80 in the housing 6. The oil passage 90 is configured to straddle the motor chamber 81 and the gear chamber 82 of the accommodation space 80. The oil passage 90 is a path of oil O that guides the oil O from the oil reservoir P on the lower side of the motor 2 (that is, the lower region in the accommodation space 80) through the motor 2 to the oil reservoir P on the lower side of the motor 2 again. It is.
　なお、本明細書において、「油路」とは、収容空間８０を循環するオイルＯの経路を意味する。したがって、「油路」とは、定常的に一方向に向かう定常的なオイルの流動を形成する「流路」のみならず、オイルを一時的に滞留させる経路（例えばリザーバ）およびオイルが滴り落ちる経路をも含む概念である。 In the present specification, the “oil passage” means a passage of oil O circulating in the storage space 80. Therefore, the "oil path" is not only a "flow path" that forms a steady flow of oil in one direction in a steady manner, but also a path (for example, a reservoir) for temporarily retaining oil and dripping oil It is a concept that also includes the route.
　油路９０は、モータ２の内部を通る第１の油路９１と、モータ２の外部を通る第２の油路（油路）９２と、を有する。オイルＯは、第１の油路９１および第２の油路９２において、モータ２を内部および外部から冷却する。 The oil passage 90 has a first oil passage 91 passing through the inside of the motor 2 and a second oil passage (oil passage) 92 passing through the outside of the motor 2. The oil O cools the motor 2 from the inside and the outside in the first oil passage 91 and the second oil passage 92.
　第１の油路９１および第２の油路９２は、ともにオイル溜りＰからオイルＯをモータ２に供給して、再びオイル溜りＰに回収する経路である。第１の油路９１および第２の油路９２において、オイルＯは、モータ２から滴下して、モータ室８１内の下部領域に溜る。モータ室８１内の下部領域に溜ったオイルＯは、隔壁開口６８を介して、ギヤ室８２内の下部領域（すなわち、オイル溜りＰ）に移動する。すなわち、第１の油路９１および第２の油路９２は、オイルＯをモータ室８１内の下部領域からギヤ室８２内の下部領域に移動させる経路を含む。 The first oil passage 91 and the second oil passage 92 are paths for supplying the oil O from the oil reservoir P to the motor 2 and recovering the oil O in the oil reservoir P again. In the first oil passage 91 and the second oil passage 92, the oil O drips from the motor 2 and accumulates in the lower region in the motor chamber 81. The oil O accumulated in the lower region in the motor chamber 81 moves to the lower region (i.e., the oil reservoir P) in the gear chamber 82 through the partition opening 68. That is, the first oil passage 91 and the second oil passage 92 include paths for moving the oil O from the lower region in the motor chamber 81 to the lower region in the gear chamber 82.
　（第１の油路）
　図１に示すように、第１の油路９１において、オイルＯは、オイル溜りＰから差動装置５によりかき上げられてロータ２０の内部に導かれる。オイルＯには、ロータ２０の内部で、ロータ２０の回転に伴う遠心力が付与される。これにより、オイルＯは、ロータ２０を径方向外側から囲むステータ３０に向かって均等に拡散されステータ３０を冷却する。 (First oil path)
As shown in FIG. 1, in the first oil passage 91, the oil O is scooped up from the oil reservoir P by the differential device 5 and guided to the inside of the rotor 20. The oil O is given a centrifugal force associated with the rotation of the rotor 20 inside the rotor 20. Thus, the oil O is uniformly diffused toward the stator 30 surrounding the rotor 20 from the radial outer side, and cools the stator 30.
　第１の油路９１は、かき上げ経路９１ａと、シャフト供給経路９１ｂと、シャフト内経路９１ｃと、ロータ内経路９１ｄと、を有する。また、第１の油路９１の経路中には、第１のリザーバ９３が設けられる。第１のリザーバ９３は、ギヤ室８２に設けられている。 The first oil passage 91 has a scraping path 91a, a shaft supply path 91b, an in-shaft path 91c, and an in-rotor path 91d. In addition, in the path of the first oil passage 91, a first reservoir 93 is provided. The first reservoir 93 is provided in the gear chamber 82.
　かき上げ経路９１ａは、差動装置５のリングギヤ５１の回転によってオイル溜りＰからオイルＯをかき上げて、第１のリザーバ９３でオイルＯを受ける経路である。図３に示すように、第１のリザーバ９３は、中間軸Ｊ４と差動軸Ｊ５との間に配置される。第１のリザーバ９３は、上側に開口する。第１のリザーバ９３は、リングギヤ５１がかき上げたオイルＯを受ける。また、モータ２の駆動直後などオイル溜りＰの液面が高い場合等には、第１のリザーバ９３は、リングギヤ５１に加えて第２のギヤ４２および第３のギヤ４３によってかき上げられたオイルＯも受ける。 The scraping path 91 a is a path for scraping the oil O from the oil reservoir P by the rotation of the ring gear 51 of the differential device 5 and receiving the oil O in the first reservoir 93. As shown in FIG. 3, the first reservoir 93 is disposed between the intermediate shaft J4 and the differential shaft J5. The first reservoir 93 opens upward. The first reservoir 93 receives the oil O picked up by the ring gear 51. Further, when the liquid level of the oil reservoir P is high immediately after the motor 2 is driven, etc., the oil stored in the first reservoir 93 is scraped up by the second gear 42 and the third gear 43 in addition to the ring gear 51. O also receive.
　シャフト供給経路９１ｂは、第１のリザーバ９３からモータ２にオイルＯを誘導する。シャフト供給経路９１ｂは、第２のハウジング部材６２に設けられた孔部９４により構成される。シャフト内経路９１ｃは、シャフト２１の中空部２２内をオイルＯが通過する経路である。ロータ内経路９１ｄは、シャフト２１の連通孔２３からロータコア２４の内部を通過して、ステータ３０に飛散する経路である。 The shaft supply path 91 b guides the oil O from the first reservoir 93 to the motor 2. The shaft supply path 91 b is constituted by a hole 94 provided in the second housing member 62. The shaft inner path 91 c is a path through which the oil O passes in the hollow portion 22 of the shaft 21. The rotor inner path 91 d is a path that passes through the inside of the rotor core 24 from the communication hole 23 of the shaft 21 and scatters to the stator 30.
　シャフト内経路９１ｃにおいて、ロータ２０の内部のオイルＯには、ロータ２０の回転に伴い遠心力が付与される。これにより、オイルＯは、ロータ２０から径方向外側に連続的に飛散する。また、オイルＯの飛散に伴い、ロータ２０内部の経路が負圧となり、第１のリザーバ９３に溜るオイルＯが、ロータ２０の内部に吸引され、ロータ２０内部の経路にオイルＯが満たされる。 In the shaft inner path 91 c, centrifugal force is applied to the oil O inside the rotor 20 as the rotor 20 rotates. As a result, the oil O continuously splashes radially outward from the rotor 20. Further, as the oil O scatters, the path inside the rotor 20 becomes negative pressure, and the oil O accumulated in the first reservoir 93 is drawn into the rotor 20 and the path inside the rotor 20 is filled with the oil O.
　ステータ３０に到達したオイルＯは、ステータ３０から熱を奪う。ステータ３０を冷却したオイルＯは、下側に滴下され、モータ室８１内の下部領域に溜る。モータ室８１内の下部領域に溜ったオイルＯは、隔壁６１ｃに設けられた隔壁開口６８を介してギヤ室８２に移動する。 The oil O that has reached the stator 30 removes heat from the stator 30. The oil O which has cooled the stator 30 is dropped downward, and is accumulated in the lower region in the motor chamber 81. The oil O accumulated in the lower region in the motor chamber 81 moves to the gear chamber 82 through the partition opening 68 provided in the partition 61 c.
　（第２の油路）
　図１に示すように、第２の油路９２においてオイルＯは、オイル溜りＰからモータ２の上側まで引き上げられてモータ２に供給される。モータ２に供給されたオイルＯは、ステータ３０の外周面を伝いながら、ステータ３０から熱を奪い、モータ２を冷却する。ステータ３０の外周面を伝ったオイルＯは、下方に滴下してモータ室８１内の下部領域に溜る。第２の油路９２のオイルＯは、第１の油路９１のオイルＯとモータ室８１内の下部領域で合流する。モータ室８１内の下部領域に溜ったオイルＯは、隔壁開口６８を介して、ギヤ室８２内の下部領域（すなわち、オイル溜りＰ）に移動する。 (Second oil path)
As shown in FIG. 1, the oil O is pulled up from the oil reservoir P to the upper side of the motor 2 in the second oil passage 92 and supplied to the motor 2. The oil O supplied to the motor 2 takes heat from the stator 30 while cooling along the outer peripheral surface of the stator 30 to cool the motor 2. The oil O transmitted along the outer peripheral surface of the stator 30 drips downward and accumulates in the lower region in the motor chamber 81. The oil O of the second oil passage 92 merges with the oil O of the first oil passage 91 in the lower region of the motor chamber 81. The oil O accumulated in the lower region in the motor chamber 81 moves to the lower region (i.e., the oil reservoir P) in the gear chamber 82 through the partition opening 68.
　第２の油路９２は、第１の流路９２ａと第２の流路９２ｂと第３の流路９２ｃとを有する。第２の油路９２の経路中には、ポンプ９６と、クーラー９７と、第２のリザーバ９８と、が設けられる。ポンプ９６は、オイルＯをモータ２に供給する。また、クーラー９７は、第２の油路９２を通過するオイルＯを冷却する。第２の油路９２において、オイルＯは、第１の流路９２ａ、ポンプ９６、第２の流路９２ｂ、クーラー９７、第３の流路９２ｃ、第２のリザーバ９８の順で各部を通過して、モータ２に供給される。 The second oil passage 92 has a first flow passage 92a, a second flow passage 92b, and a third flow passage 92c. In the path of the second oil passage 92, a pump 96, a cooler 97, and a second reservoir 98 are provided. The pump 96 supplies oil O to the motor 2. The cooler 97 also cools the oil O passing through the second oil passage 92. In the second oil passage 92, the oil O passes through each portion in the order of the first passage 92a, the pump 96, the second passage 92b, the cooler 97, the third passage 92c, and the second reservoir 98. And supplied to the motor 2.
　第１の流路９２ａ、第２の流路９２ｂおよび第３の流路９２ｃは、収容空間８０を囲むハウジング６の壁部を通過する。第１の流路９２ａは、オイル溜りＰとポンプ９６とを繋ぐ。第２の流路９２ｂは、ポンプ９６とクーラー９７とを繋ぐ。第３の流路９２ｃは、クーラー９７と収容空間８０とを繋ぐ。 The first flow passage 92 a, the second flow passage 92 b and the third flow passage 92 c pass through the wall of the housing 6 surrounding the accommodation space 80. The first flow path 92 a connects the oil reservoir P and the pump 96. The second flow path 92 b connects the pump 96 and the cooler 97. The third flow path 92 c connects the cooler 97 and the storage space 80.
　本実施形態において、第１の流路９２ａ、第２の流路９２ｂおよび第３の流路９２ｃは、収容空間８０を囲むハウジング６の壁部の内部を通過する。したがって、別途管材を用意する必要がなく部品点数減少に寄与できる。 In the present embodiment, the first flow passage 92 a, the second flow passage 92 b, and the third flow passage 92 c pass through the inside of the wall portion of the housing 6 surrounding the accommodation space 80. Therefore, it is not necessary to prepare a pipe separately, which can contribute to the reduction in the number of parts.
　ポンプ９６は、電気により駆動する電動ポンプである。ポンプ９６は、第１の流路９２ａを介してオイル溜りＰからオイルＯを吸い上げて、第２の流路９２ｂ、クーラー９７、第３の流路９２ｃおよび第２のリザーバ９８を介してモータ２に供給する。 The pump 96 is an electric pump driven by electricity. The pump 96 sucks up the oil O from the oil reservoir P via the first flow passage 92 a, and the motor 2 via the second flow passage 92 b, the cooler 97, the third flow passage 92 c and the second reservoir 98. Supply to
　図６に示すように、ポンプ９６は、ポンプ機構部９６ｐと、ポンプモータ９６ｍと、吸入口９６ａと吐出口９６ｂとを有する。本実施形態において、ポンプ機構部９６ｐは、図示略の外歯車と内歯車がかみ合って回転するトロコイダルポンプである。ポンプ機構部９６ｐの内歯車は、ポンプモータ９６ｍによって回転させられる。ポンプ機構部９６ｐの内歯車と外歯車との間の隙間は、吸入口９６ａおよび吐出口９６ｂに繋がる。 As shown in FIG. 6, the pump 96 has a pump mechanism 96p, a pump motor 96m, an inlet 96a and an outlet 96b. In the present embodiment, the pump mechanism portion 96p is a trochoidal pump in which an external gear (not shown) and an internal gear mesh with each other and rotate. The internal gear of the pump mechanism 96p is rotated by the pump motor 96m. The gap between the internal gear and the external gear of the pump mechanism portion 96p leads to the suction port 96a and the discharge port 96b.
　ポンプ９６の吸入口９６ａは、第１の流路９２ａに繋がる。また、ポンプ９６の吐出口９６ｂは、第２の流路９２ｂに繋がる。ポンプ９６は、第１の流路９２ａを介してオイル溜りＰからオイルＯを吸い上げて、第２の流路９２ｂ、クーラー９７、第３の流路９２ｃおよび第２のリザーバ９８を介してモータ２に供給する。 The suction port 96a of the pump 96 is connected to the first flow passage 92a. Further, the discharge port 96 b of the pump 96 is connected to the second flow path 92 b. The pump 96 sucks up the oil O from the oil reservoir P via the first flow passage 92 a, and the motor 2 via the second flow passage 92 b, the cooler 97, the third flow passage 92 c and the second reservoir 98. Supply to
　ポンプモータ９６ｍは、ポンプ機構部９６ｐの内歯車を回転させる。ポンプモータ９６ｍの回転軸Ｊ６は、モータ軸Ｊ２と平行である。ポンプモータ９６ｍを有するポンプ９６は、回転軸Ｊ６方向に長尺となり易い。本実施形態によれば、ポンプモータ９６ｍの回転軸Ｊ６をモータ軸Ｊ２と平行とすることで、モータユニット１の径方向の寸法を小型化することができる。また、モータユニット１の径方向寸法を小型化することで、軸方向から見てポンプ９６をハウジング６の張出部６ｄに重ねて配置しやすい。結果的に、モータユニット１の軸方向の投影面積が大きくなることを抑制してモータユニット１を小型化しやすい構造を実現できる。 The pump motor 96m rotates the internal gear of the pump mechanism 96p. The rotation axis J6 of the pump motor 96m is parallel to the motor axis J2. The pump 96 having the pump motor 96m tends to be long in the direction of the rotation axis J6. According to the present embodiment, by making the rotation axis J6 of the pump motor 96m parallel to the motor axis J2, it is possible to reduce the size of the motor unit 1 in the radial direction. In addition, by reducing the radial dimension of the motor unit 1, the pump 96 can be easily disposed so as to overlap the overhanging portion 6 d of the housing 6 as viewed from the axial direction. As a result, it is possible to realize a structure in which the motor unit 1 can be easily miniaturized by suppressing an increase in the projected area in the axial direction of the motor unit 1.
　ポンプ９６は、モータ室８１の下側に位置する。また、ポンプ９６は、張出部６ｄのモータ収容部６ａ側を向く面に固定される。ポンプ９６の吸入口９６ａは、張出部６ｄに対向して配置される。ポンプ９６の吸入口９６ａに繋がる第１の流路９２ａは、張出部６ｄの壁面を軸方向に直線的に貫通して、ギヤ室８２内の下部領域に開口する。すなわち、張出部６ｄには、軸方向に沿って延びギヤ室８２内の下部領域（すなわち、オイル溜りＰ）からポンプ９６に繋がる第１の流路９２ａが設けられる。 The pump 96 is located below the motor chamber 81. The pump 96 is fixed to the surface of the overhang 6 d facing the motor housing 6 a. The suction port 96a of the pump 96 is disposed to face the overhang 6d. The first flow passage 92 a connected to the suction port 96 a of the pump 96 linearly penetrates the wall surface of the overhang portion 6 d in the axial direction and opens in the lower region in the gear chamber 82. That is, the overhanging portion 6 d is provided with a first flow passage 92 a which extends along the axial direction and is connected to the pump 96 from the lower region (i.e., oil reservoir P) in the gear chamber 82.
　本実施形態によれば、ポンプ９６がモータ室８１の下側に配置されるため、吸入口９６ａをオイル溜りＰの近くに配置しやすい。結果的に、オイル溜りＰと吸入口９６ａとを繋ぐ第１の流路９２ａを短くすることができる。また、オイル溜りＰと吸入口９６ａとの距離が近いために、第１の流路９２ａを直線的な流路とすることができる。第１の流路９２ａを直線的な短い流路とすることで、オイル溜りＰからポンプ９６に至る経路の圧力損失を低減し、効率的なオイルＯの循環を実現することができる。 According to the present embodiment, since the pump 96 is disposed below the motor chamber 81, the suction port 96a can be easily disposed near the oil reservoir P. As a result, the first flow path 92a connecting the oil reservoir P and the suction port 96a can be shortened. Further, since the distance between the oil reservoir P and the suction port 96a is short, the first flow path 92a can be made a linear flow path. By setting the first flow path 92a as a linear short flow path, pressure loss in the path from the oil reservoir P to the pump 96 can be reduced, and efficient oil O circulation can be realized.
　図１に示すように、クーラー９７には、第１の流路９２ａおよび第２の流路９２ｂが接続される。第１の流路９２ａおよび第２の流路９２ｂは、クーラー９７の内部流路を介して繋がる。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９７ｊが接続される。クーラー９７の内部を通過するオイルＯは、冷却水用配管９７ｊ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９７ｊの経路中には、インバータユニット８が設けられる。冷却水用配管９７ｊを通過する冷却水は、インバータユニット８を冷却する。 As shown in FIG. 1, the cooler 97 is connected to a first flow passage 92 a and a second flow passage 92 b. The first flow path 92 a and the second flow path 92 b are connected via the internal flow path of the cooler 97. Connected to the cooler 97 is a cooling water pipe 97j that allows the cooling water cooled by a radiator (not shown) to pass. The oil O passing through the inside of the cooler 97 is cooled by heat exchange with the cooling water passing through the cooling water pipe 97j. An inverter unit 8 is provided in the path of the cooling water pipe 97j. The cooling water passing through the cooling water pipe 97j cools the inverter unit 8.
　図５に示すように、クーラー９７は、モータ室８１の下側において、モータ収容部６ａの径方向外側を向く外周面に固定される。図１に示すように、モータ２に供給されたオイルＯは、モータ室８１内の下部領域に一時的に溜った後に、隔壁開口６８を介してギヤ室８２内の下部領域に移動する。本実施形態によれば、クーラー９７が、モータ室８１の下側で、モータ収容部６ａの外周面に固定されるため、クーラー９７の設置面からモータ収容部６ａの壁面を介してモータ室８１内の下部領域に溜ったオイルＯを冷却することができる。 As shown in FIG. 5, the cooler 97 is fixed to the outer peripheral surface of the motor housing portion 6 a facing the radially outer side on the lower side of the motor chamber 81. As shown in FIG. 1, the oil O supplied to the motor 2 temporarily accumulates in the lower region in the motor chamber 81 and then moves to the lower region in the gear chamber 82 through the partition opening 68. According to the present embodiment, since the cooler 97 is fixed to the outer peripheral surface of the motor housing 6a below the motor chamber 81, the motor chamber 81 from the installation surface of the cooler 97 via the wall surface of the motor housing 6a. The oil O accumulated in the lower region of the inside can be cooled.
　図５に示すように、クーラー９７およびポンプ９６は、軸方向から見て少なくとも一部がギヤ収容部６ｂの張出部６ｄに重なる。張出部６ｄの内部には、ギヤ部３が収容される。張出部６ｄの軸方向の投影面積は、ギヤ部３の各ギヤの大きさに依存して決まる。ギヤ部３を構成する各ギヤの大きさは、所望のギヤ比を満たすために設定されている。このため、張出部６ｄの軸方向の投影面積を小さくすることは、困難である。本実施形態によれば、軸方向においてクーラー９７およびポンプ９６を張出部６ｄに重ねて配置することで、モータユニット１の軸方向の投影面積が、クーラー９７およびポンプ９６によって大きくなることを抑制できる。これにより、モータユニット１の軸方向の投影面積が大きくなることを抑制して、モータユニット１を小型化することができる。 As shown in FIG. 5, the cooler 97 and the pump 96 at least partially overlap the overhanging portion 6 d of the gear housing portion 6 b when viewed in the axial direction. The gear portion 3 is accommodated inside the overhang portion 6 d. The projected area in the axial direction of the overhang portion 6 d is determined depending on the size of each gear of the gear portion 3. The size of each gear constituting the gear portion 3 is set to satisfy a desired gear ratio. For this reason, it is difficult to reduce the projected area in the axial direction of the overhang portion 6d. According to the present embodiment, by arranging the cooler 97 and the pump 96 in the axial direction so as to overlap the overhang portion 6 d, the axial projection area of the motor unit 1 is prevented from being increased by the cooler 97 and the pump 96. it can. As a result, the motor unit 1 can be miniaturized while suppressing an increase in the projected area in the axial direction of the motor unit 1.
　本実施形態によれば、クーラー９７およびポンプ９６は、軸方向から見て、少なくとも一部がギヤ部３の第２のギヤ４２に重なる。このため、張出部６ｄの軸方向から見た投影面積をギヤ部３の各ギヤの外形に沿ってできるだけ小さくした場合であっても、軸方向から見てクーラー９７およびポンプ９６が張出部６ｄに重なる構成が実現できる。結果的に、モータユニット１の軸方向の投影面積が大きくなることを抑制して、モータユニット１を小型化することができる。 According to this embodiment, the cooler 97 and the pump 96 at least partially overlap the second gear 42 of the gear portion 3 as viewed in the axial direction. Therefore, even if the projected area of the overhang 6d as viewed in the axial direction is as small as possible along the outline of each gear of the gear portion 3, the cooler 97 and the pump 96 overhang as viewed from the axial direction A configuration overlapping with 6d can be realized. As a result, it is possible to miniaturize the motor unit 1 while suppressing an increase in the projected area in the axial direction of the motor unit 1.
　本実施形態によれば、クーラー９７およびポンプ９６は、張出部６ｄの下端より上側に位置する。すなわち、クーラー９７およびポンプ９６が、張出部６ｄの下端からさらに下側に飛び出すことがない。このため、上下方向において、モータユニット１を小型化することができる。 According to the present embodiment, the cooler 97 and the pump 96 are located above the lower end of the overhang 6 d. That is, the cooler 97 and the pump 96 do not protrude further downward from the lower end of the overhang 6 d. For this reason, the motor unit 1 can be miniaturized in the vertical direction.
　クーラー９７およびポンプ９６は、モータ室８１の鉛直方向下側に位置する。モータユニット１は、例えば車両のボンネット内に配置される。また、モータユニット１において、クーラー９７およびポンプ９６は、ハウジング６に対して突出する突起物である。本実施形態によれば、クーラー９７およびポンプ９６をモータ室８１の鉛直方向下側に配置することで、車両が事故などによって対象物に衝突した場合であっても、突起物であるクーラー９７およびポンプ９６が、対象物に突き刺さることを抑制できる。 The cooler 97 and the pump 96 are located below the motor chamber 81 in the vertical direction. The motor unit 1 is disposed, for example, in a hood of a vehicle. Further, in the motor unit 1, the cooler 97 and the pump 96 are projections that project relative to the housing 6. According to the present embodiment, by disposing the cooler 97 and the pump 96 below the motor chamber 81 in the vertical direction, even if the vehicle collides with the object due to an accident or the like, the cooler 97 which is a protrusion can be The pump 96 can suppress sticking to an object.
　本実施形態によれば、ポンプ９６およびクーラー９７が、ハウジング６の外周面に固定される。このため、ポンプ９６およびクーラー９７が、ハウジング６の外部の構造物に固定される場合と比較して、モータユニット１の小型化に寄与できる。加えて、ポンプ９６およびクーラー９７が、ハウジング６の外周面に固定されることで、ハウジング６の壁部を通過する第１の流路９２ａ、第２の流路９２ｂおよび第３の流路９２ｃにより、収容空間８０とポンプ９６およびクーラー９７とを繋ぐ流路を構成することができる。 According to the present embodiment, the pump 96 and the cooler 97 are fixed to the outer peripheral surface of the housing 6. For this reason, as compared with the case where the pump 96 and the cooler 97 are fixed to a structure outside the housing 6, the motor unit 1 can be reduced in size. In addition, the pump 96 and the cooler 97 are fixed to the outer peripheral surface of the housing 6, whereby the first flow passage 92a, the second flow passage 92b and the third flow passage 92c passing through the wall of the housing 6 Thus, a flow path connecting the housing space 80, the pump 96 and the cooler 97 can be configured.
　図６に示すように、本実施形態によれば、軸方向におけるポンプ９６の位置とクーラー９７の位置とは、互いに重なる。クーラー９７とポンプ９６とは、第２の流路９２ｂを介して繋がる。すなわち、第２の油路９２には、ポンプ９６とクーラー９７とを繋ぐ第２の流路９２ｂが設けられる。本実施形態によれば、ポンプ９６およびクーラー９７の軸方向位置が互いに重なることで、第２の流路９２ｂを軸方向と直交する方向に直線的に延ばす構造を実現できる。すなわち、第２の流路９２ｂを直線的な短い流路とすることができ、ポンプ９６からクーラー９７に至る経路の圧力損失を低減し、効率的なオイルＯの循環を実現することができる。 As shown in FIG. 6, according to the present embodiment, the position of the pump 96 in the axial direction and the position of the cooler 97 overlap each other. The cooler 97 and the pump 96 are connected via the second flow path 92b. That is, the second oil passage 92 is provided with a second flow passage 92 b connecting the pump 96 and the cooler 97. According to the present embodiment, the axial positions of the pump 96 and the cooler 97 overlap with each other, so that it is possible to realize a structure in which the second flow path 92b linearly extends in the direction orthogonal to the axial direction. That is, the second flow path 92b can be made a linear short flow path, pressure loss in the path from the pump 96 to the cooler 97 can be reduced, and efficient oil O circulation can be realized.
　図１に示すように、第２のリザーバ９８は、収容空間８０のモータ室８１に位置する。第２のリザーバ９８は、モータの上側に位置する。第２のリザーバ９８は、第３の流路９２ｃを介してモータ室８１に供給されたオイルＯを貯留する。第２のリザーバ９８は、複数の流出口９８ａを有する。第２のリザーバ９８内に溜ったオイルＯは、各流出口９８ａからモータ２に供給される。第２のリザーバ９８の流出口９８ａから流出したオイルＯは、上側から下側に向かってモータ２の外周面を伝って流れてモータ２の熱を奪う。これにより、モータ２全体を冷却することができる。 As shown in FIG. 1, the second reservoir 98 is located in the motor chamber 81 of the accommodation space 80. The second reservoir 98 is located above the motor. The second reservoir 98 stores the oil O supplied to the motor chamber 81 via the third flow path 92c. The second reservoir 98 has a plurality of outlets 98a. The oil O accumulated in the second reservoir 98 is supplied to the motor 2 from each outlet 98 a. The oil O flowing out from the outlet 98 a of the second reservoir 98 flows from the upper side to the lower side along the outer peripheral surface of the motor 2 to remove the heat of the motor 2. Thereby, the whole motor 2 can be cooled.
　第２のリザーバ９８は、軸方向に沿って延びる。また、第２のリザーバ９８の流出口９８ａは、第２のリザーバ９８の軸方向の両端部に設けられる。流出口９８ａは、コイルエンド３１ａの上側に位置する。これにより、ステータ３０の軸方向両端に位置するコイルエンド３１ａにオイルＯをかけてコイル３１を直接的に冷却できる。 The second reservoir 98 extends along the axial direction. Also, the outlets 98 a of the second reservoir 98 are provided at both axial ends of the second reservoir 98. The outlet 98a is located above the coil end 31a. As a result, it is possible to apply oil O to the coil ends 31 a located at both axial ends of the stator 30 to directly cool the coils 31.
　コイル３１を冷却したオイルＯは、下側に滴下され、モータ室８１内の下部領域に溜る。モータ室８１内の下部領域に溜ったオイルＯは、隔壁６１ｃに設けられた隔壁開口６８を介してギヤ室８２に移動する。 The oil O which has cooled the coil 31 is dropped downward, and is accumulated in the lower region in the motor chamber 81. The oil O accumulated in the lower region in the motor chamber 81 moves to the gear chamber 82 through the partition opening 68 provided in the partition 61 c.
　本実施形態によれば、第２の油路９２の経路中には、オイルＯを冷却するクーラー９７が設けられる。第２の油路９２を通過しクーラー９７により冷却されたオイルＯは、オイル溜りＰにおいて第１の油路９１を通過したオイルＯと合流する。オイル溜りＰにおいて、第１の油路９１および第２の油路９２を通過したオイルＯは、互いに混ざりあって熱交換が行われる。このため、第２の油路９２の経路中に配置されてクーラー９７の冷却の効果を第１の油路９１を通過するオイルＯにも及ぼすことができる。 According to the present embodiment, a cooler 97 for cooling the oil O is provided in the path of the second oil passage 92. The oil O passing through the second oil passage 92 and cooled by the cooler 97 merges with the oil O passing through the first oil passage 91 in the oil reservoir P. In the oil reservoir P, the oil O which has passed through the first oil passage 91 and the second oil passage 92 is mixed with each other to perform heat exchange. For this reason, the oil O which is disposed in the path of the second oil passage 92 and has the effect of cooling the cooler 97 can also be exerted on the oil O passing through the first oil passage 91.
　＜インバータユニット＞
　インバータユニット８は、モータ２と電気的に接続される。インバータユニット８は、モータ２に供給される電流を制御する。図５に示すように、インバータユニット８は、ハウジング６に固定される。より具体的には、インバータユニット８は、モータ収容部６ａの径方向外側を向く外周面に固定される。 <Inverter unit>
Inverter unit 8 is electrically connected to motor 2. The inverter unit 8 controls the current supplied to the motor 2. As shown in FIG. 5, the inverter unit 8 is fixed to the housing 6. More specifically, inverter unit 8 is fixed to the outer peripheral surface facing the radially outer side of motor housing 6a.
　インバータユニット８は、軸方向から見て、少なくとも一部がギヤ収容部６ｂの張出部６ｄに重なる。本実施形態によれば、軸方向から見て、インバータユニット８を張出部６ｄに重ねて配置することで、モータユニット１の軸方向の投影面積が、インバータユニット８によって大きくなることを抑制できる。これにより、モータユニット１の軸方向の投影面積が大きくなることを抑制して、モータユニット１を小型化することができる。 When viewed in the axial direction, at least a portion of the inverter unit 8 overlaps the overhanging portion 6 d of the gear housing portion 6 b. According to the present embodiment, by arranging the inverter unit 8 so as to overlap the overhang portion 6 d when viewed from the axial direction, it is possible to suppress the increase in the projection area in the axial direction of the motor unit 1 due to the inverter unit 8. . As a result, the motor unit 1 can be miniaturized while suppressing an increase in the projected area in the axial direction of the motor unit 1.
　本実施形態によれば、インバータユニット８は、軸方向から見て、少なくとも一部がギヤ部３のリングギヤ５１に重なる。このため、張出部６ｄの軸方向から見た投影面積をギヤ部３の各ギヤの外形に沿ってできるだけ小さくした場合であっても、軸方向から見てインバータユニット８が張出部６ｄに重なる構成が実現できる。結果的に、モータユニット１の軸方向の投影面積が大きくなることを抑制して、モータユニット１を小型化することができる。 According to the present embodiment, at least a portion of the inverter unit 8 overlaps the ring gear 51 of the gear portion 3 when viewed in the axial direction. Therefore, even if the projected area of the overhang 6d viewed in the axial direction is made as small as possible along the outer shape of each gear of the gear portion 3, the inverter unit 8 is not An overlapping configuration can be realized. As a result, it is possible to miniaturize the motor unit 1 while suppressing an increase in the projected area in the axial direction of the motor unit 1.
　本実施形態によれば、インバータユニット８は、鉛直方向から見て、モータ軸Ｊ２を挟んでクーラー９７と反対側に位置する。このため、軸方向から見て張出部６ｄと重なる領域を有効的に活用して、モータユニット１の水平方向に沿う寸法を小さくすることが可能となり、モータユニット１の小型化を図ることができる。 According to the present embodiment, the inverter unit 8 is located on the opposite side of the cooler 97 with respect to the motor axis J2 when viewed from the vertical direction. For this reason, it is possible to reduce the dimension along the horizontal direction of the motor unit 1 by effectively utilizing the region overlapping with the overhanging portion 6 d when viewed from the axial direction, thereby achieving downsizing of the motor unit 1. it can.
　図１に示すように、インバータユニット８には、図示略のラジエータから延びる冷却水用配管９７ｊが接続される。これにより、インバータユニット８を効率的に冷却できる。また、冷却水用配管９７ｊを流れる冷却水は、インバータユニット８の筐体部を介して筐体部に接触するモータ収容部６ａをも冷却する。 As shown in FIG. 1, a cooling water pipe 97 j extending from a radiator (not shown) is connected to the inverter unit 8. Thereby, the inverter unit 8 can be cooled efficiently. Further, the cooling water flowing through the cooling water pipe 97 j also cools the motor housing portion 6 a which contacts the housing portion via the housing portion of the inverter unit 8.
　＜パーキング機構＞
　電気自動車では、サイドブレーキ以外に車両にブレーキをかける制動機構が無いため、モータユニット１にパーキング機構７が必要となる。 <Parking mechanism>
In the electric vehicle, there is no braking mechanism for applying a brake to the vehicle other than the side brakes, so the motor unit 1 needs the parking mechanism 7.
　図１に示すように、パーキング機構７は、中間シャフト４５に固定され中間シャフト４５とともに中間軸Ｊ４周りに回転するパーキングギヤ７１と、パーキングギヤ７１の歯間に移動してパーキングギヤ７１の回転を阻止する回転阻止部７２と、回転阻止部７２を駆動するパーキングモータ７３と、を有する。モータ２の動作時において、回転阻止部７２は、パーキングギヤ７１から退避する。一方、シフトレバーがパーキングの位置にある時は、パーキングモータ７３が回転阻止部７２をパーキングギヤ７１の歯間に移動させパーキングギヤ７１の回転を阻止する。 As shown in FIG. 1, the parking mechanism 7 moves between the teeth of the parking gear 71 fixed to the intermediate shaft 45 and rotating around the intermediate shaft J4 with the intermediate shaft 45 and rotates the parking gear 71. It has the rotation prevention part 72 to block, and the parking motor 73 which drives the rotation prevention part 72. FIG. During the operation of motor 2, rotation prevention unit 72 retracts from parking gear 71. On the other hand, when the shift lever is at the parking position, the parking motor 73 moves the rotation preventing portion 72 between the teeth of the parking gear 71 to prevent the parking gear 71 from rotating.
　以上に、本発明の実施形態および変形例を説明したが、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。 Although the embodiments and modifications of the present invention have been described above, the respective configurations and combinations thereof in the embodiments are merely examples, and additions, omissions, replacements, and configurations of the configurations are possible within the scope of the present invention. Other modifications are possible. Further, the present invention is not limited by the embodiments.
１…モータユニット、２…モータ、３…ギヤ部、６…ハウジング、６ａ…モータ収容部、６ｂ…ギヤ収容部、６ｄ…張出部、８…インバータユニット、２１…シャフト（モータシャフト）、８１…モータ室、８２…ギヤ室、９０…油路、９２…第２の油路（油路）、９６…ポンプ、９６ｍ…ポンプモータ、９７…クーラー、Ｊ２…モータ軸、Ｊ６…回転軸、Ｏ…オイル DESCRIPTION OF SYMBOLS 1 ... motor unit, 2 ... motor, 3 ... gear part, 6 ... housing, 6a ... motor accommodation part, 6b ... gear accommodation part, 6d ... overhang part, 8 ... inverter unit, 21 ... shaft (motor shaft), 81 ... motor chamber, 82 ... gear chamber, 90 ... oil passage, 92 ... second oil passage (oil passage), 96 ... pump, 96 m ... pump motor, 97 ... cooler, J2 ... motor shaft, J6 ... rotating shaft, O …oil

Claims (7)

  1. 　水平方向に沿って延びるモータ軸を中心として回転するモータシャフトを有するモータと、
    　前記モータ軸の軸方向一方側において前記モータシャフトに接続されるギヤ部と、
    　前記モータおよび前記ギヤ部を収容するハウジングと、
    　前記ハウジング内に収容されるオイルと、を備え、
    　前記ハウジングは、前記モータを収容するモータ室を内部に設けるモータ収容部と、前記ギヤ部を収容するギヤ室を内部に設けるギヤ収容部と、を有し、
    　前記ハウジングには、前記オイルを循環させ前記モータを冷却する油路が設けられ、
    　前記油路の経路中には、前記油路を通過する前記オイルを冷却するクーラーと、前記オイルを前記モータに供給するポンプと、が設けられ、
    　前記ギヤ収容部は、前記モータ軸の軸方向から見て前記モータ収容部に対して前記モータ軸の径方向に張り出す張出部を有し、
    　前記クーラーおよび前記ポンプは、前記モータ軸の軸方向から見て、少なくとも一部が前記張出部に重なる、
    モータユニット。     A motor having a motor shaft rotating about a motor shaft extending along a horizontal direction;
    A gear portion connected to the motor shaft on one side in the axial direction of the motor shaft;
    A housing for accommodating the motor and the gear portion;
    And an oil contained in the housing.
    The housing has a motor housing portion in which a motor chamber housing the motor is provided, and a gear housing portion in which a gear chamber housing the gear portion is provided.
    The housing is provided with an oil passage for circulating the oil and cooling the motor.
    In the path of the oil passage, a cooler for cooling the oil passing through the oil passage and a pump for supplying the oil to the motor are provided.
    The gear housing portion has a protruding portion which protrudes in the radial direction of the motor shaft with respect to the motor housing portion when viewed from the axial direction of the motor shaft.
    The cooler and the pump at least partially overlap the overhang when viewed in the axial direction of the motor shaft.
    Motor unit.
  2. 　前記クーラーおよび前記ポンプは、前記モータ室の鉛直方向下側に位置し、
    　前記クーラーおよび前記ポンプは、前記張出部の下端より上側に位置する、
    請求項１に記載のモータユニット。     The cooler and the pump are located vertically below the motor chamber,
    The cooler and the pump are located above the lower end of the overhang portion.
    The motor unit according to claim 1.
  3. 　前記モータ軸の軸方向における前記ポンプの位置と前記クーラーの位置とが互いに重なる、
    請求項１又は２に記載のモータユニット。     The position of the pump in the axial direction of the motor shaft and the position of the cooler overlap each other,
    A motor unit according to claim 1 or 2.
  4. 　前記クーラーは、前記モータ室の鉛直方向下側において、前記モータ収容部の外周面に固定される、
    請求項１～３の何れか一項に記載のモータユニット。     The cooler is fixed to an outer peripheral surface of the motor housing at a lower side of the motor chamber in the vertical direction.
    The motor unit according to any one of claims 1 to 3.
  5. 　前記ポンプは、ポンプモータを有し、
    　前記ポンプモータの回転軸は、前記モータ軸と平行である、
    請求項１～４の何れか一項に記載のモータユニット。     The pump comprises a pump motor,
    The rotational axis of the pump motor is parallel to the motor axis,
    The motor unit according to any one of claims 1 to 4.
  6. 　前記油路は、前記オイルを前記モータ室内の下部領域から前記ギヤ室内の下部領域に移動させる経路を含み、
    　前記ポンプは、前記モータ室の鉛直方向下側に位置し、前記張出部の前記モータ収容部側を向く面に固定され、
    　前記張出部には、モータ軸の軸方向に沿って延び前記ギヤ室内の下部領域から前記ポンプに繋がる流路が設けられる、
    請求項１～５の何れか一項に記載のモータユニット。     The oil passage includes a path for moving the oil from a lower region in the motor chamber to a lower region in the gear chamber,
    The pump is positioned below the motor chamber in the vertical direction, and is fixed to a surface of the overhanging portion facing the motor housing portion side,
    The overhanging portion is provided with a flow path extending along the axial direction of the motor shaft and connected to the pump from the lower region in the gear chamber.
    The motor unit according to any one of claims 1 to 5.
  7. 　前記モータに供給される電流を制御するインバータユニットを備え、
    　前記インバータユニットは、モータ収容部の外周面に固定され、
    　前記インバータユニットは、前記モータ軸の軸方向から見て少なくとも一部が前記張出部に重なる、
    請求項１～６の何れか一項に記載のモータユニット。     An inverter unit that controls a current supplied to the motor;
    The inverter unit is fixed to the outer peripheral surface of the motor housing portion,
    The inverter unit has at least a portion overlapping the overhang when viewed in the axial direction of the motor shaft.
    The motor unit according to any one of claims 1 to 6.
PCT/JP2018/047081 2017-12-28 2018-12-20 Motor unit WO2019131454A1 (en)

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CN202210755968.XA CN114915075A (en) 2017-12-28 2018-12-20 Motor unit
CN202210756182.XA CN114928193A (en) 2017-12-28 2018-12-20 Driving device
CN201880084227.5A CN111557070B (en) 2017-12-28 2018-12-20 Motor unit
CN202210756116.2A CN114899974A (en) 2017-12-28 2018-12-20 Motor unit
CN202210756066.8A CN114928192A (en) 2017-12-28 2018-12-20 Vehicle drive device

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GB2599616A (en) * 2020-07-10 2022-04-13 Edge Mobility Ltd Liquid cooled electric motor
DE112020005614T5 (en) 2019-11-15 2022-09-01 Nidec Corporation ENGINE UNIT AND ENGINE CONTROL SYSTEM
JP7484547B2 (en) 2020-08-07 2024-05-16 株式会社アイシン Vehicle drive device
JP7484548B2 (en) 2020-08-07 2024-05-16 株式会社アイシン Rotating Electric Machine

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DE112020005614T5 (en) 2019-11-15 2022-09-01 Nidec Corporation ENGINE UNIT AND ENGINE CONTROL SYSTEM
CN113472127A (en) * 2020-03-30 2021-10-01 日本电产株式会社 Motor unit
GB2599616A (en) * 2020-07-10 2022-04-13 Edge Mobility Ltd Liquid cooled electric motor
JP7484547B2 (en) 2020-08-07 2024-05-16 株式会社アイシン Vehicle drive device
JP7484548B2 (en) 2020-08-07 2024-05-16 株式会社アイシン Rotating Electric Machine

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CN114928192A (en) 2022-08-19
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