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WO2019039060A1 - Dispositif d'entraînement - Google Patents

Dispositif d'entraînement Download PDF

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Publication number
WO2019039060A1
WO2019039060A1 PCT/JP2018/023304 JP2018023304W WO2019039060A1 WO 2019039060 A1 WO2019039060 A1 WO 2019039060A1 JP 2018023304 W JP2018023304 W JP 2018023304W WO 2019039060 A1 WO2019039060 A1 WO 2019039060A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor core
oil
holding portion
oil passage
axial direction
Prior art date
Application number
PCT/JP2018/023304
Other languages
English (en)
Japanese (ja)
Inventor
勇樹 石川
修平 中松
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 CN201880050820.8A priority Critical patent/CN111033969B/zh
Publication of WO2019039060A1 publication Critical patent/WO2019039060A1/fr

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Classifications

    • 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
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • 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
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating

Definitions

  • the present invention relates to a drive device.
  • An electric motor in which a coolant is circulated in a case for lubrication and cooling of a stator, a rotor and the like.
  • Japanese Patent Laid-Open Publication No. 2003-324901 describes an electric motor mounted on a vehicle.
  • the cooling fluid is caused to flow through the passage inside the rotor, and is ejected from the plurality of discharge ports to cool the coil.
  • the pressure of the cooling fluid spouted from the plurality of discharge ports tends to be uneven, and it is difficult to uniformly cool the coil.
  • An object of one embodiment of the present invention is to provide a drive device in which the uniformity of coil cooling is improved.
  • a rotor having a motor shaft disposed along a central axis extending in one direction and a rotor core fixed to the motor shaft, and a stator radially opposed to the rotor via a gap.
  • a housing that accommodates the rotor and the stator and has an accommodation portion capable of storing oil, and the motor shaft extends along a central axis, and a radial outer side of the shaft body.
  • a cylindrical rotor core holding portion located in the axial direction, a connecting portion radially connecting the outer peripheral surface of the shaft main body portion and the inner peripheral surface of the rotor core holding portion, and the axial direction extending in the axial direction
  • a plurality of second oil passages branched from the first oil passage and extending radially along the inside of the connection portion;
  • a plurality of third oil passages branched from the oil passage and extending along the axial direction inside the connection portion, and opening in the surfaces facing the axial direction one side and the other side of the connection portion;
  • the flow passage cross-sectional area of the second oil passage is smaller than the flow passage cross-sectional area of the first oil passage, and the flow passage cross-sectional area of the third oil passage is smaller than the flow passage cross-sectional area of the second oil passage ,
  • a driving device is provided.
  • a drive device with improved coil cooling uniformity is provided.
  • FIG. 1 is a cross-sectional view showing a drive device of the embodiment.
  • FIG. 2 is a partial cross-sectional view showing the configuration of a modification.
  • FIG. 1 is a cross-sectional view showing a drive device of the present embodiment.
  • the Z-axis direction shown in the figure is a vertical direction Z with the positive side as the upper side and the negative side as the lower side.
  • the vertical direction Z is the vertical direction of the figure.
  • the upper side in the vertical direction is simply referred to as "upper side”
  • the lower side in the vertical direction is simply referred to as "lower side”.
  • the drive device 1 of the present embodiment includes a rotor 20 having a housing 10 and a motor shaft 20 a disposed along a central axis J1 extending in one direction, a rotation detection unit 80, and a stator 30. , A pump unit 40, and bearings 70, 71.
  • the central axis J1 extends in the left-right direction in FIG. That is, in the present embodiment, the left and right direction in FIG. 1 corresponds to one direction.
  • a direction parallel to the axial direction of the central axis J1 is simply referred to as "axial direction”
  • a radial direction centered on the central axis J1 is simply referred to as “radial direction”
  • the central axis J1 is centered
  • the circumferential direction is simply referred to as "circumferential direction”.
  • the left side of FIG. 1 in the axial direction is referred to as “one side in the axial direction”
  • the right side of FIG. 1 in the axial direction is referred to as the “other side in the axial direction”.
  • the housing 10 has a main body 11, an inner lid 12, and an outer lid 13.
  • the main body 11, the inner lid 12 and the outer lid 13 are separate members.
  • the main body portion 11 has a bottomed cylindrical shape that opens in one side in the axial direction.
  • the main body portion 11 has a bottom portion 11 a, a main body cylindrical portion 11 b, and a bearing holding portion 11 c.
  • the bottom portion 11 a is in the form of an annular plate that expands in the radial direction.
  • the main body cylindrical portion 11b has a cylindrical shape extending in the axial direction from the outer peripheral edge portion of the bottom portion 11a.
  • the bearing holding portion 11c has a cylindrical shape that protrudes in one axial direction from the inner edge portion of the bottom portion 11a.
  • the bearing holder 11 c holds the bearing 71 on the inner circumferential surface.
  • the inner lid 12 is attached to one side of the main body 11 in the axial direction.
  • the inner lid portion 12 includes an annular plate portion 12a, an outer cylindrical portion 12b, an inner cylindrical portion 12c, and a bearing holding portion 12e.
  • the annular plate portion 12 a has an annular plate shape that expands in the radial direction.
  • the inner cover 12 covers one side of the stator 30 in the axial direction by the annular plate 12 a.
  • the annular plate portion 12a has an opening 12f at its lower end, which axially penetrates the annular plate portion 12a.
  • the opening 12 f leads to the inside of the housing 10.
  • the outer cylindrical portion 12b is in the shape of a cylinder extending from the radial outer edge of the annular plate portion 12a to the other side in the axial direction.
  • the other axial end of the outer cylindrical portion 12b is fixed in contact with the axial one end of the main cylindrical portion 11b.
  • the inner cylindrical portion 12c has a cylindrical shape extending from the radially inner edge of the annular plate portion 12a to the other side in the axial direction.
  • the bearing holding portion 12e has an annular portion 101 extending radially inward from an end portion on the other axial side of the inner cylindrical portion 12c, and a cylindrical portion 102 projecting to the other end side in the axial direction from the radial inner edge portion of the annular portion.
  • the inner lid 12 has a second recess 12 g which is recessed from the surface on one axial side of the inner lid 12 to the other axial side.
  • the inner surface of the second recess 12 g includes the inner peripheral surface of the inner cylindrical portion 12 c and the surface on one axial side of the annular portion 101.
  • the surface on one axial side of the inner lid 12 is the surface on one axial side of the annular portion 101 in the present embodiment.
  • the inner side surface of the second recess 12 g includes the radially inner side surface of the inner cylindrical portion 12 c and the surface on one axial side of the annular portion 101.
  • the cylindrical portion 102 of the bearing holding portion 12 e has a cylindrical shape that protrudes from the radially inner end of the annular portion 101 to the other side in the axial direction.
  • the bearing holding portion 12 e holds the bearing 70 on the inner peripheral surface of the cylindrical portion 102.
  • the housing 10 has a housing portion 14 composed of a main body portion 11 and an inner lid portion 12.
  • the housing portion 14 houses the rotor 20 and the stator 30.
  • the stator 30 is fixed to the inner surface of the main body 11.
  • the rotor 20 is disposed radially inward of the stator 30.
  • the stator 30 faces the rotor 20 in the radial direction via a gap.
  • the stator 30 has a stator core 31 and a plurality of coils 32 mounted on the stator core 31.
  • the stator core 31 has an annular shape centered on the central axis J1.
  • the outer peripheral surface of the stator core 31 is fixed to the inner peripheral surface of the main body cylindrical portion 11b.
  • the stator core 31 opposes the radial direction outer side of the rotor core 22 mentioned later via a clearance gap.
  • the coil 32 projects on one side in the axial direction of the stator core 31 and on the other side in the axial direction.
  • the storage unit 14 can store oil O inside.
  • the oil O is stored in the region below the accommodation portion 14 in the vertical direction.
  • the “vertically lower region of the storage portion” includes a portion located below the center of the storage portion in the vertical direction Z.
  • the liquid level OS of the oil O stored in the storage portion 14 is located above the opening 12 f.
  • the fluid level OS of the oil O fluctuates as the pump portion 40 sucks up the oil O, but is disposed below the rotor 20 at least when the rotor 20 rotates. Thereby, when the rotor 20 rotates, it can suppress that oil O becomes rotation resistance of the rotor 20. As shown in FIG.
  • the outer cover 13 is attached to one side of the inner cover 12 in the axial direction.
  • the outer lid 13 has an outer lid main body 13a and a plug body 13b.
  • the outer lid main body 13a spreads in the radial direction.
  • the outer lid main body portion 13a has a lid plate portion 13c and a projecting portion 13d.
  • the cover plate portion 13c is in the shape of a circular plate that expands in the radial direction.
  • the radially outer edge portion of the cover plate portion 13c is fixed to the radially outer edge portion of the annular plate portion 12a.
  • the surface on the other side in the axial direction of the cover plate portion 13c contacts the surface on the one side in the axial direction of the annular plate portion 12a.
  • the protrusion 13 d protrudes from the central portion of the lid plate 13 c to the other side in the axial direction.
  • the protrusion 13 d is inserted into the inner cylindrical portion 12 c from one side in the axial direction.
  • the protruding portions 13 d are arranged at intervals in one axial direction of the annular portion 101 of the bearing holding portion 12 e.
  • the outer cover main body 13a has a first recess 13e and a second through hole 13f.
  • the first recess 13 e is recessed from the surface on one side in the axial direction of the outer lid main body 13 a to the other side in the axial direction.
  • the first recess 13e is provided at the center of the outer lid main body 13a, and is provided across the lid plate 13c and the protrusion 13d.
  • the second through hole 13 f penetrates from the bottom surface of the first recess 13 e to the surface on the other side in the axial direction of the protrusion 13 d. That is, the second through holes 13 f penetrate from the bottom surface of the first recess 13 e to the inside of the housing 10.
  • the second through holes 13 f open inside the second recess 12 g. Thereby, the second through hole 13 f connects the inside of the first recess 13 e and the inside of the second recess 12 g. A central axis J1 passes through the second through hole 13f.
  • the plug portion 13b is fitted into the first recess 13e and fixed to the outer cover main portion 13a.
  • the plug portion 13 b closes an opening on one side in the axial direction of the first recess 13 e.
  • the plug portion 13b covers one axial side of the motor shaft 20a. That is, the outer cover 13 covers one side in the axial direction of the motor shaft 20a.
  • the plug portion 13 b has a flange portion 13 g projecting radially outward at an end on one side in the axial direction.
  • the flange portion 13g contacts the surface on one side in the axial direction of the lid plate portion 13c.
  • the plug portion 13b is axially positioned by the collar 13g.
  • the internal gear 43 and the external gear 42 are accommodated between the outer lid main portion 13a and the plug portion 13b.
  • the portion of the outer cover 13 that accommodates the external gear 42 and the internal gear 43 constitutes the pump 40.
  • the pump unit 40 is a trochoidal pump.
  • a cylindrical mounting member 50 for connecting the pump portion 40 and the oil passage in the motor shaft 20a is inserted into the through hole of the external gear 42.
  • the plug portion 13b has a suction side oil passage 40a and a discharge side oil passage 40b.
  • the suction side oil passage 40 a connects the opening 12 f and the suction port of the pump unit 40 via an oil passage (not shown) provided in the outer cover 13.
  • the discharge side oil passage 40 b connects the discharge port of the pump portion 40 and the through hole of the mounting member 50.
  • the rotor 20 has a motor shaft 20 a, a rotor core 22, a first end plate 24, and a second end plate 25.
  • the motor shaft 20 a has a shaft main body 21 a, a rotor core holding portion 21 b, a connection portion 21 c, and an attachment member 50.
  • the shaft body portion 21a, the rotor core holding portion 21b, and the connection portion 21c are a single member.
  • the shaft body portion 21a is a cylindrical shape extending in the axial direction centering on the central axis J1.
  • the rotor core holding portion 21b has a cylindrical shape centering on the central axis J1 and surrounding the radially outer side of the shaft main portion 21a.
  • the axial length of the rotor core holding portion 21b is shorter than the axial length of the shaft main portion 21a.
  • the connecting portion 21c annularly expands radially outward from the axial central portion of the shaft main portion 21a in a region where the shaft main portion 21a and the rotor core holding portion 21b overlap in the radial direction, and the shaft main portion 21a and The rotor core holding portion 21b is connected in the radial direction.
  • connection portion 21c The axial length of the connection portion 21c is shorter than the axial length of the shaft main portion 21a and the axial length of the rotor core holding portion 21b. Therefore, the outer peripheral surface 201a of the shaft main portion 21a and the inner peripheral surface 201b of the rotor core holding portion 21b radially face each other on one side in the axial direction of the connection portion 21c. Further, on the other side in the axial direction of the connection portion 21c, the outer peripheral surface 202a of the shaft main portion 21a and the inner peripheral surface 202b of the rotor core holding portion 21b face in the radial direction.
  • the motor shaft 20a has a first shaft recess 21A opening toward one side in the axial direction and a second shaft recess 21B opening toward the other side in the axial direction.
  • the first shaft recess 21 ⁇ / b> A is an annular groove which is open to one side in the axial direction and extends in the circumferential direction.
  • the outer peripheral surface 201a of the shaft main portion 21a and the inner peripheral surface 201b of the rotor core holding portion 21b are side surfaces, and the surface 201c on one side in the axial direction of the connecting portion 21c is a bottom surface.
  • the inner circumferential surface 201b of the rotor core holding portion 21b is inclined radially outward toward the opening end on one side in the axial direction of the rotor core holding portion 21b.
  • the inner circumferential surface 201b of the rotor core holding portion 21b has a sloped surface portion 201d having a curved surface shape at the end on the opening side in the axial direction.
  • the sloped portion 201 d is a curved surface which is inclined radially outward as it goes to one side in the axial direction.
  • the second shaft recess 21 ⁇ / b> B is an annular groove which is open on the other side in the axial direction and extends in the circumferential direction.
  • the outer peripheral surface 202a of the shaft main portion 21a and the inner peripheral surface 202b of the rotor core holding portion 21b are side surfaces, and the surface 202c on one axial direction side of the connection portion 21c is a bottom surface.
  • the inner circumferential surface 202b of the rotor core holding portion 21b is inclined radially outward toward the opening end on the other axial direction side of the rotor core holding portion 21b.
  • the shaft main portion 21a is rotatably supported by a bearing 70 located on one side in the axial direction of the connection portion 21c and a bearing 71 located on the other side in the axial direction of the connection portion 21c.
  • the bearings 70 and 71 are, for example, ball bearings.
  • a part of the bearing holding portion 12e holding the bearing 70 overlaps the rotor core holding portion 21b as viewed in the radial direction. According to this configuration, the axial length of the drive device 1 can be shortened, and the thickness can be reduced.
  • the cylindrical portion 102 of the bearing holding portion 12e has a shape in which the diameter increases in the axial direction toward the one side in the vicinity of the opening on the one side in the axial direction of the rotor core holding portion 21b. That is, the outer peripheral surface of the bearing holding portion 12e is an inclined surface which is inclined radially outward from the inside to the outside in the axial direction of the rotor core holding portion 21b.
  • the outer peripheral surface of the bearing holding portion 12e has a curved surface shape that follows the sloped portion 201d of the rotor core holding portion 21b opposed with a gap.
  • the annular portion 101 of the bearing holding portion 12 e faces the flange portion 203 in the axial direction. That is, the bearing holding portion 12e faces the surface of the rotor core holding portion 21b facing in the axial direction.
  • the shaft body portion 21a has an output portion 21e at the other end in the axial direction.
  • the rotation detection unit 80 is disposed on one side in the axial direction of the bearing 70.
  • the rotation detection unit 80 detects the rotation of the rotor 20.
  • the rotation detection unit 80 is, for example, a VR (Variable Reluctance) resolver.
  • the rotation detection unit 80 is disposed on the inner side in the radial direction of the inner cylindrical portion 12c.
  • the resolver rotor of the rotation detection unit 80 is fixed to an end portion on one side in the axial direction of the shaft main portion 21a, and the resolver stator is fixed to the inner periphery of the inner cylindrical portion 12c.
  • the rotation detection unit 80 may be configured by combining a Hall element or an MR (Magneto Resistive) element with a magnet.
  • the shaft body 21a has a first oil passage 61 which is open at one axial end of the shaft body 21a and has a bottomed hole extending to the other axial side.
  • the other axial end of the first oil passage 61 is closed.
  • the inner edge of the first oil passage 61 has a circular shape centered on the central axis J1.
  • the rotor core holding portion 21 b is a portion of the motor shaft 20 a to which the rotor core 22 is attached.
  • the rotor core 22 has an annular shape fixed to the shaft body 21a.
  • the rotor core 22 is fitted to the outer peripheral surface of the cylindrical rotor core holding portion 21b.
  • the rotor core 22 has a plurality of rotor magnets (not shown). The plurality of rotor magnets are arranged along the circumferential direction of the rotor core 22.
  • the rotor core holding portion 21 b has a flange portion 203 that extends outward in the radial direction from an end portion on one axial side.
  • the flange portion 203 has an internally threaded portion 203a penetrating in the axial direction.
  • the first end plate 24 is axially sandwiched between the flange portion 203 and the rotor core 22.
  • the second end plate 25 is disposed in contact with the other surface of the rotor core 22 in the axial direction.
  • the first end plate 24 and the second end plate 25 are in the form of a radially expanding annular plate. However, the first end plate 24 may not be necessary.
  • the rotor core 22 and the second end plate 25 have a through hole axially penetrating the rotor core 22 and the second end plate 25.
  • the rotor core 22 is fixed to the rotor core holding portion by bolts 204.
  • the bolt 204 is inserted into the through hole of the rotor core 22 and the second end plate 25.
  • the male screw portion of the bolt 204 is fastened to the female screw portion of the flange portion 203.
  • the rotor core holding portion 21b includes the flange portion 203, whereby the rotor core 22 can be positioned and fixed in the axial direction.
  • the bolt 204 can be fastened without using a nut. Since the tip of the bolt 204 only slightly protrudes on the surface on one side in the axial direction of the flange portion 203, the flow of oil O transmitted along the surface of the flange portion 203 is not easily inhibited.
  • the mounting member 50 is fixed to one side in the axial direction of the shaft main portion 21 a by a cap-like connecting member 51.
  • the connecting member 51 has a through hole which penetrates the connecting member 51 in the axial direction, and the mounting member 50 is inserted into the through hole of the connecting member 51.
  • the through hole of the mounting member 50 constitutes a part of the first oil passage 61 of the shaft body 21 a and is connected to the discharge side oil passage 40 b of the pump 40.
  • the mounting member 50 extends to one side in the axial direction with respect to the shaft main portion 21a, and is rotatably supported by the second through hole 13f.
  • the first oil passage 61 is branched into a plurality of second oil passages 62 at a central portion in the axial direction of the shaft main portion 21 a.
  • the plurality of second oil passages 62 radially extend from the first oil passage 61 in the radial direction.
  • the number of second oil passages 62 is, for example, 2 to 16.
  • the second oil passage 62 may have a shape inclined or curved with respect to the radial direction as long as the oil can be guided radially outward from the first oil passage 61.
  • the second oil passage 62 radially extends from the first oil passage 61, penetrates the connection portion 21c and the rotor core holding portion 21b, and opens at the outer peripheral surface of the rotor core holding portion 21b. Therefore, a part of the inner peripheral surface of the rotor core 22 is exposed at the radially outer end of the second oil passage 62. Thus, the rotor core 22 can also be cooled by the oil O.
  • the second oil passage 62 is branched into two third oil passages 63A and 63B in the inside of the connection portion 21c.
  • the third oil passage 63A extends from the branch point with the second oil passage 62 in the axial direction to one side, and opens in the surface 201c on the one side in the axial direction of the connection portion 21c.
  • the third oil passage 63B extends from the branch point with the second oil passage 62 to the other side in the axial direction, and opens in the surface 202c on the other side in the axial direction of the connection portion 21c.
  • the third oil passages 63A, 63B may be inclined or curved in the axial direction as long as the oil can be guided in the axial direction from the second oil passage 62.
  • the third oil passages 63A, 63B open at the central portion in the radial direction of the connection portion 21c.
  • the corner of the bottom of the first shaft recess 21A and the second shaft recess 21B tends to be rounded, and the drill is slippery in the vicinity of the corner, which makes drilling difficult.
  • the central portion in the radial direction of the connection portion 21c is likely to be a relatively flat surface, so it is easy to perform drilling. Further, since the processing is easy, the accuracy of the third oil passages 63A and 63B can be easily improved.
  • the shaft body 21a further includes fourth oil passages 64A, 64B extending from the first oil passage 61 to the bearings 70, 71.
  • the fourth oil passage 64A is branched from an axial center portion of the first oil passage 61, and obliquely extends outward in the radial direction toward the radial one side.
  • the fourth oil passage 64A is opened at a position facing the other surface of the bearing 70 in the axial direction on the outer peripheral surface of the shaft main portion 21a.
  • the connection position of the fourth oil passage 64A and the first oil passage 61 is on one side in the axial direction of the connection position of the second oil passage 62 and the first oil passage 61.
  • the number of fourth oil passages 64A is, for example, 1 to 8.
  • the fourth oil passage 64B is branched from the other axial end of the first oil passage 61 and extends radially outward.
  • the connection position of the fourth oil passage 64 ⁇ / b> B and the first oil passage 61 is on the other side in the axial direction with respect to the bearing 71.
  • the fourth oil passage 64B extends radially outward from the first oil passage 61.
  • the fourth oil passage 64B is open at a position facing the other surface of the bearing 71 in the axial direction on the outer peripheral surface of the shaft main portion 21a.
  • the number of fourth oil passages 64B is, for example, 1 to 8.
  • the pump unit 40 is driven via the motor shaft 20a.
  • the drive device 1 when the rotor 20 rotates and the motor shaft 20 a rotates, the external gear 42 fixed to the motor shaft 20 a rotates.
  • the internal gear 43 engaged with the external gear 42 is rotated, and the oil O is pumped up from the lower part of the housing portion 14 through the suction side oil passage 40a.
  • the oil O sucked between the external gear 42 and the internal gear 43 is discharged to the discharge side oil passage 40b.
  • the oil O discharged to the discharge side oil passage 40 b flows into the first oil passage 61.
  • the oil O that has flowed into the first oil passage 61 flows into the plurality of second oil passages 62 branched at the central portion in the axial direction. Further, the oil O having flowed into the second oil passage 62 flows into the two third oil passages 63A, 63B branched at the radial center of the second oil passage 62. The oil O that has flowed into the third oil passage 63A flows into the first shaft recess 21A from the opening located on the surface 201c facing the axial direction one side of the connection portion 21c.
  • the oil O that has flowed into the first shaft recess 21A moves radially outward by centrifugal force and reaches the inner circumferential surface 201b of the rotor core holding portion 21b.
  • the oil O on the inner circumferential surface 201b moves to one side in the axial direction along the inclination of the inner circumferential surface 201b.
  • the oil O that has reached the end portion on one side in the axial direction of the inner circumferential surface 201b is directed radially outward in the moving direction along the sloped portion 201d, and flows out to the outside of the first shaft recess 21A.
  • the inner peripheral surface 201b is an inclined surface, the oil O smoothly moves toward the coil 32 without staying on the inner peripheral surface 201b.
  • the moving direction of the oil O can be smoothly rotated in the radial direction from the axial direction, and the main scattering direction of the oil O is directed to the coil 32. be able to.
  • the oil O that has flowed out of the first shaft recess 21A is scattered radially outward directly from the axial direction end of the inner circumferential surface 201b, or moves radially outward along the surface of the flange portion 203. Splash.
  • the scattered oil O adheres to the coil 32 of the stator 30, and cools the coil 32.
  • the rotor core holding portion 21b has the flange portion 203, so that the oil O flowing radially outward from the sloped portion 201d at the opening end of the first shaft recess 21A is one side of the flange portion 203 in the axial direction. It can be scattered radially outward along the surface.
  • the bearing holding portion 12e is disposed at a position facing the inner circumferential surface 201b of the rotor core holding portion 21b and the flange portion 203.
  • the oil O that has flowed into the second shaft recess 21B moves radially outward by centrifugal force and reaches the inner circumferential surface 202b of the rotor core holding portion 21b.
  • the oil O on the inner peripheral surface 202b moves to the other side in the axial direction along the inclination of the inner peripheral surface 202b, and flows out from the end on the other axial side of the inner peripheral surface 201b to the outside of the second shaft recess 21B.
  • the inner peripheral surface 202b is an inclined surface, the oil O smoothly moves toward the coil 32 without staying on the inner peripheral surface 202b.
  • the oil O that has flowed out of the second shaft recess 21B scatters directly radially outward from the other axial end of the inner circumferential surface 202b, or moves radially outward along the surface of the second end plate 25. It flies after being done.
  • the scattered oil O adheres to the coil 32 of the stator 30, and cools the coil 32.
  • the flow passage cross-sectional area of the oil passage decreases in the order of the first oil passage 61, the second oil passage 62, and the third oil passages 63A and 63B. Because a plurality of second oil passages 62 are branched from one first oil passage 61, and two third oil passages 63A and 63B are branched from one second oil passage 62, each time it is branched By making the oil passage thin, it is possible to maintain the flow passage cross-sectional area of the entire oil passage and to carry the oil O at a constant pressure.
  • the flow passage cross-sectional area of the first oil passage 61 may be 90% or more and 110% or less of the sum of the flow passage cross-sectional areas of the plurality of branched second oil passages 62.
  • the pressure fluctuation of the oil O flowing from the first oil passage 61 to the second oil passage 62 can be suppressed by suppressing the change rate of the flow passage cross-sectional area before and after branching to 10% or less.
  • the amount of oil O supplied to the coil 32 can be suppressed from fluctuating in the circumferential direction.
  • the flow passage cross-sectional area of the second oil passage 62 may be 90% or more and 110% or less of the sum of the flow passage cross-sectional areas of the branched third oil passages 63A and 63B.
  • a part of the oil O flowing through the first oil passage 61 flows out of the opening of the outer peripheral surface of the shaft body 21a through the fourth oil passage 64A, and is supplied to the bearing 70.
  • the other oil O flows from the opening of the outer peripheral surface of the shaft body 21a from the first oil passage 61 through the fourth oil passage 64B, and is supplied to the bearing 71.
  • the oil O is used as a lubricant for the bearings 70, 71.
  • the fourth oil passages 64A, 64B are branched from the first oil passage 61. Therefore, the relationship between the flow passage cross-sectional areas may be taken into consideration of the flow passage cross-sectional areas of the fourth oil passages 64A and 64B. That is, the flow passage cross-sectional area of the first oil passage 61 is at least 90% of the sum of the flow passage cross-sectional areas of the plurality of second oil passages 62 and the fourth oil passages 64A and 64B branched from the first oil passage 61 It may be% or less. As a result, pressure fluctuations can be suppressed in each oil passage branched from the first oil passage 61, and variation in the discharge amount of the oil O can be suppressed.
  • the pump portion 40 can be driven by the rotation of the motor shaft 20a, and the oil O stored in the housing 10 can be sucked up by the pump portion 40 and supplied to the rotor 20, the stator 30, and the bearings 70, 71. .
  • the oil 20 stored in the housing 10 can be used to cool the rotor 20 and the stator 30, and the lubricity between the bearings 70 and 71 and the shaft main portion 21a can be improved.
  • the oil O supplied to the stator 30 and the bearings 70 and 71 drops in the housing portion 14 and is stored again in the lower area of the housing portion 14. Thereby, the oil O in the accommodating part 14 can be circulated.
  • FIG. 2 is a partial cross-sectional view of a modified rotor 20A.
  • the rotor core holding portion 21b of the rotor 20A is directed to the inner circumferential surface 201b and the inner circumferential surface 202b from the connection position with the connection portion 21c toward the opening end on both axial sides of the rotor core holding portion 21b. It has fin parts 210 and 211 which extend.
  • the configuration of the rotor 20A is the same as that of the rotor 20 of the embodiment except for the fin portions 210 and 211.
  • the fin portions 210 and 211 are, for example, strip-like protrusions extending along the axial direction, and are arranged in the circumferential direction on the inner circumferential surfaces 201 b and 202 b. According to this configuration, the oil O located in the first shaft recess 21A and the second shaft recess 21B can be smoothly moved in the axial direction by the fin portions 210 and 211. Thus, the oil O is efficiently supplied to the coil 32. In the above configuration, only one of the fin portions 210 and 211 may be provided.
  • the external gear 42 may be directly fixed to the shaft body 21 a without the attachment member 50.
  • the first oil passage 61 may be provided, for example, only inside the shaft body 21a.
  • the mounting member 50 may be fixed to the outer peripheral surface of the shaft main body 21 a.
  • the rotor core 22 may be fixed to the outer peripheral surface of the rotor core holding portion 21b by press fitting or the like.
  • the flange portion 203, the first end plate 24, and the second end plate 25 of the rotor core holding portion 21b may not be provided.

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

Abstract

La présente invention concerne un dispositif d'entraînement qui comprend : un rotor ayant un arbre de moteur et un noyau de rotor ; un stator ; et un boîtier ayant une section de contenant permettant de contenir de l'huile. L'arbre de moteur comprend : un corps d'arbre s'étendant dans la direction d'un axe central ; une section de maintien de noyau de rotor cylindrique située radialement à l'extérieur du corps d'arbre ; une section de liaison permettant de relier radialement la surface périphérique externe du corps d'arbre et la surface périphérique interne de la section de maintien de noyau de rotor ; un premier passage d'huile s'étendant axialement à l'intérieur du corps d'arbre et ouvert à une extrémité axiale du corps d'arbre ; une pluralité de deuxièmes passages d'huile dérivant du premier passage d'huile et s'étendant radialement à l'intérieur de la section de liaison ; et une pluralité de troisièmes passages d'huile qui dérivent des seconds passages d'huile, s'étendent axialement à l'intérieur de la section de liaison, et sont ouverts aux surfaces de la section de liaison, qui font face à un premier côté axial et à l'autre côté axial. La surface de section transversale de passage d'écoulement des deuxièmes passages d'huile est inférieure à celle du premier passage d'huile, et la surface de section transversale de passage d'écoulement des troisièmes passages d'huile est inférieure à celle des deuxièmes passages d'huile.
PCT/JP2018/023304 2017-08-25 2018-06-19 Dispositif d'entraînement WO2019039060A1 (fr)

Priority Applications (1)

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CN201880050820.8A CN111033969B (zh) 2017-08-25 2018-06-19 驱动装置

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JP2017-162675 2017-08-25
JP2017162675 2017-08-25

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WO2019039060A1 true WO2019039060A1 (fr) 2019-02-28

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Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN112467912A (zh) * 2020-11-18 2021-03-09 珠海格力电器股份有限公司 一种用于电机的油冷机构、油冷系统及电机

Citations (4)

* Cited by examiner, † Cited by third party
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JP2009213231A (ja) * 2008-03-03 2009-09-17 Nissan Motor Co Ltd 電動機
JP2009291056A (ja) * 2008-06-02 2009-12-10 Ntn Corp モータの冷却構造
JP2016086462A (ja) * 2014-10-23 2016-05-19 トヨタ自動車株式会社 回転電機のロータ
JP2017131078A (ja) * 2016-01-22 2017-07-27 Ntn株式会社 モータの冷却構造

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JP3967624B2 (ja) * 2002-04-26 2007-08-29 株式会社日本自動車部品総合研究所 電動機
US7002267B2 (en) * 2004-03-22 2006-02-21 General Motors Corporation Method and apparatus for cooling a hybrid transmission electric motor
JP4550631B2 (ja) * 2005-03-11 2010-09-22 本田技研工業株式会社 車両用ホイール駆動装置
US20080135339A1 (en) * 2006-11-17 2008-06-12 Miller Kent A Method and apparatus for cooling and lubricating an off-axis motor/generator
JP5448559B2 (ja) * 2009-05-07 2014-03-19 Ｎｔｎ株式会社 モータの冷却構造
JP5738007B2 (ja) * 2011-03-02 2015-06-17 株式会社小松製作所 電動機の冷却構造及び電動機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009213231A (ja) * 2008-03-03 2009-09-17 Nissan Motor Co Ltd 電動機
JP2009291056A (ja) * 2008-06-02 2009-12-10 Ntn Corp モータの冷却構造
JP2016086462A (ja) * 2014-10-23 2016-05-19 トヨタ自動車株式会社 回転電機のロータ
JP2017131078A (ja) * 2016-01-22 2017-07-27 Ntn株式会社 モータの冷却構造

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