WO2019049464A1 - Dispositif d'entraînement - Google Patents

Dispositif d'entraînement Download PDF

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Publication number
WO2019049464A1
WO2019049464A1 PCT/JP2018/023303 JP2018023303W WO2019049464A1 WO 2019049464 A1 WO2019049464 A1 WO 2019049464A1 JP 2018023303 W JP2018023303 W JP 2018023303W WO 2019049464 A1 WO2019049464 A1 WO 2019049464A1
Authority
WO
WIPO (PCT)
Prior art keywords
axial direction
oil
housing
cooling device
inner lid
Prior art date
Application number
PCT/JP2018/023303
Other languages
English (en)
Japanese (ja)
Inventor
山口　康夫
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 CN201880053560.XA priority Critical patent/CN111033972B/zh
Publication of WO2019049464A1 publication Critical patent/WO2019049464A1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • 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
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the present invention relates to a drive device.
  • Japanese Patent Laid-Open Publication No. 2013-055728 describes a rotating electrical machine mounted on a vehicle.
  • the above-described rotating electrical machine may be provided with a pump unit that sucks up the oil stored in the case.
  • the rotor and the stator can be cooled by sucking up the oil by the pump unit and supplying the oil to the rotor and the stator, for example.
  • the pump unit is driven using the rotation of the rotating electrical machine.
  • the oil stored in the case is often in a state in which the stator is immersed, and the heat of the stator may cause the oil to have a relatively high temperature. Therefore, in order to improve the cooling efficiency by oil, it is conceivable to cool the oil.
  • As a method of cooling the oil there is a method of disposing a cooling device in the middle of an oil passage through which the oil passes and passing the oil through the inside of the cooling device.
  • simply arranging the cooling device may make it difficult to form an oil passage connected to the cooling device.
  • the present invention has an object to provide a drive device having a cooling device capable of cooling oil and having a structure that facilitates the formation of an oil passage connected to the cooling device.
  • a rotor having a motor shaft disposed along a central axis extending in one direction, a stator radially opposed to the rotor via a gap, the rotor and the stator
  • a housing having an accommodating portion capable of storing oil, a pump portion driven via the motor shaft, and a cooling device mounted on the lower side in the vertical direction of the housing, the cooling device comprising: An inlet for communicating with a vertically lower region in the interior of the storage unit and causing the oil stored in the storage unit to flow into the interior of the cooling device; and an outlet for discharging the oil from the interior of the cooling device; And cooling oil flowing through the inside of the cooling device,
  • the pump unit includes a pump chamber provided in the housing, and the pump
  • the housing has an intake port capable of sucking in oil and a discharge port capable of discharging oil from the pump chamber, and the housing is an inner lid portion covering one side in the axial direction of the stator, and the inner lid portion And an intake oil
  • a drive device includes a cooling device capable of cooling oil, and has a structure that facilitates the creation of an oil passage connected to the cooling device.
  • FIG. 1 is a cross-sectional view showing the drive device of the first embodiment.
  • FIG. 2 is a cross-sectional view showing a part of the drive device of the first embodiment.
  • FIG. 3 is a view of the pump unit of the first embodiment as viewed from the other side in the axial direction.
  • FIG. 4 is a cross-sectional view showing a part of the drive device of the first embodiment.
  • FIG. 5 is a cross-sectional view showing a part of the drive device of the second embodiment.
  • FIG. 6 is a cross-sectional view showing a part of the drive device of the third embodiment.
  • the Z-axis direction shown in each drawing is the vertical direction Z with the positive side as the upper side and the negative side as the lower side.
  • 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 this embodiment includes a housing 10, a rotor 20 having a motor shaft 20 a disposed along a central axis J1 extending in one direction, and a rotation detection unit 80. , A stator 30, a cooling device 92, a strainer 93, a pump portion 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 housing body 11, an inner lid 12 and an outer lid 13.
  • the housing body 11, the inner lid 12 and the outer lid 13 are separate members.
  • the housing main body 11 is a bottomed cylindrical shape that opens in one side in the axial direction.
  • the housing body portion 11 has a bottom portion 11 a, a 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 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 main body cylindrical portion 11 b has a cylindrical shape extending in the axial direction from the outer peripheral portion of the bottom portion 11 a in the radial direction.
  • the main body cylindrical portion 11b has a stator holding portion 11f and a second projecting portion 11g.
  • the stator holding portion 11 f is a substantially cylindrical portion that holds a stator core 31 described later of the stator 30.
  • the second protrusion 11 g is a lower end of the main body cylindrical portion 11 b.
  • the radially inner side surface of the second protrusion 11 g protrudes radially outward with respect to the radially inner side surface of the stator holding portion 11 f.
  • a bottom surface 11 h which is a lower surface of the radially inner surface of the second protrusion 11 g is disposed below the stator core 31 at a lower position.
  • the second protrusion 11 g has an inflow hole 11 d and an outflow hole 11 e.
  • the inflow holes 11 d and the outflow holes 11 e penetrate the lower wall of the second protrusion 11 g in the vertical direction Z.
  • the inflow hole portion 11 d is disposed at a position facing the stator core 31 described later via a gap in the radial direction.
  • the outflow hole 11e is disposed on one side in the axial direction with respect to the inflow hole 11d.
  • the inner lid 12 is attached to one side of the housing body 11 in the axial direction.
  • the inner lid portion 12 includes an inner lid main body portion 12a, an inner cylindrical portion 12c, an inner cylindrical bottom portion 12d, a bearing holding portion 12e, and a first projecting portion 12b.
  • the inner lid main body 12a has an annular shape that expands in the radial direction.
  • the inner lid main body 12 a covers one axial side of the stator 30. That is, the inner cover 12 covers one side of the stator 30 in the axial direction.
  • the radial outer edge portion of the inner lid main body portion 12a is fixed in contact with the end portion on one side in the axial direction of the main body cylindrical portion 11b. Thereby, the inner lid main body 12 a is fixed to one side of the housing main body 11 in the axial direction.
  • the inner cylindrical portion 12c has a cylindrical shape extending from the radial inner edge portion of the inner lid main portion 12a to the other side in the axial direction.
  • the inner cylinder bottom portion 12d has an annular shape that extends radially inward from an end on the other side in the axial direction of the inner cylindrical portion 12c.
  • the inner lid 12 is provided with a second recess 12g which is recessed from the surface on one side in the axial direction of the inner lid 12 to the other side in the axial direction by the inner cylindrical portion 12c and the inner cylinder bottom 12d. That is, the inner lid 12 has a second recess 12g.
  • the surface on one side in the axial direction of the inner lid 12 is the surface on the one side in the axial direction of the inner lid body 12a.
  • the inner side surface of the second concave portion 12g includes the radially inner side surface of the inner cylindrical portion 12c and the surface on one axial side of the inner cylindrical bottom portion 12d.
  • the bearing holding portion 12e has a cylindrical shape that protrudes from the surface on the other side in the axial direction of the inner cylinder bottom 12d to the other side in the axial direction.
  • the bearing holder 12e holds the bearing 70 on the inner circumferential surface. That is, the inner lid 12 holds the bearing 70.
  • the first protrusion 12 b protrudes from the inner lid body 12 a to the other side in the axial direction. More specifically, the first protrusion 12b protrudes from the portion of the inner lid body 12a below the inner cylindrical portion 12c to the other side in the axial direction. Although the illustration is omitted, the first protrusion 12 b is, for example, a rectangular parallelepiped. The end on the other side in the axial direction of the first protrusion 12 b is, for example, disposed at substantially the same position as the end on the other side in the axial direction of the inner cylindrical portion 12 c in the axial direction.
  • the first protrusion 12 b is inserted into the housing main body 11 from an opening on one side in the axial direction of the housing main body 11.
  • the lower surface of the first protrusion 12b contacts the bottom surface 11h. That is, the first protrusion 12 b contacts the lower portion of the inner side surface of the housing body 11.
  • a seal member 95 is disposed between the lower surface of the first protrusion 12 b and the bottom surface 11 h.
  • the seal member 95 seals between the lower surface of the first protrusion 12 b and the bottom surface 11 h.
  • the seal member 95 has an annular shape surrounding an introduction portion 63 d described later.
  • the seal member 95 can prevent the oil O flowing through the introduction portion 63d from leaking between the lower surface of the first protrusion 12b and the bottom surface 11h.
  • the seal member 95 is, for example, an O-ring.
  • the housing 10 has a housing portion 14 composed of a housing body 11 and an inner lid 12.
  • the accommodation portion 14 accommodates the rotor 20 and the stator 30 and can store oil O.
  • the oil O is stored in the vertically lower region in the housing portion 14.
  • the “vertically lower region inside the housing portion” includes a portion located below the center of the vertical direction Z inside the housing portion.
  • the liquid level OS of the oil O stored in the housing portion 14 fluctuates because the pump portion 40 sucks up the oil O, but at least when the rotor 20 rotates, the liquid level OS is disposed below the rotor 20 Be done. 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 third 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 lid plate portion 13c is fixed to the radially outer edge portion of the inner lid main body portion 12a.
  • the surface on the other side in the axial direction of the lid plate portion 13c contacts the surface on the one side in the axial direction of the inner lid main body portion 12a.
  • the third projecting portion 13 d protrudes from the central portion of the lid plate portion 13 c to the other side in the axial direction.
  • the third protrusion 13 d is inserted into the inner cylindrical portion 12 c from one side in the axial direction.
  • the third protrusion 13 d is disposed at an interval on one side in the axial direction of the inner cylinder bottom 12 d.
  • 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 third protrusion 13d.
  • the second through hole 13 f penetrates from the bottom surface of the first recess 13 e to the other surface of the third protrusion 13 d in the axial direction. 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. Thereby, the plug part 13b can be positioned in the axial direction.
  • a pump chamber 46 is provided in the outer cover 13.
  • the pump chamber 46 is provided axially between the surface on the other side in the axial direction of the plug portion 13 b and the bottom surface of the first recess 13 e.
  • the surface on the other side in the axial direction of the pump chamber 46 is the bottom surface of the first recess 13 e.
  • the surface on one axial side of the pump chamber 46 is the surface on the other axial side of the plug portion 13 b.
  • the pump chamber 46 is an end on the other axial side of the inside of the first recess 13 e.
  • the pump chamber 46 is disposed radially inward of the inner cylindrical portion 12c, that is, inside the second recess 12g.
  • a central axis J1 passes through the pump chamber 46.
  • the outer shape of the pump chamber 46 is circular.
  • the pump chamber 46 accommodates an internal gear 43 and an external gear 42 described later.
  • the housing 10 has a first oil passage 61 and an intake oil passage 63.
  • the first oil passage 61 is provided in the outer cover 13. More specifically, the first oil passage 61 is provided in the plug portion 13 b. Therefore, the configuration of the first oil passage 61 can be easily changed by replacing the plug portion 13b.
  • the first oil passage 61 is disposed on one side in the axial direction of the pump chamber 46.
  • the first oil passage 61 connects the upper end portion of the pump chamber 46 and the central portion of the pump chamber 46 on one side in the axial direction of the pump chamber 46.
  • the portion of the first oil passage 61 connected to the pump chamber 46 is open at the other surface of the plug portion 13 b in the axial direction.
  • An upper end portion of the pump chamber 46 connected to the first oil passage 61 is a discharge port 45. That is, the first oil passage 61 is connected to the discharge port 45.
  • a central portion of the pump chamber 46 connected to the first oil passage 61 is a connection port 61 a. As shown in FIG. 3, the discharge port 45 and the connection port 61a are, for example, circular.
  • the discharge port 45 is disposed above the connection port 61a.
  • a central axis J1 passes through the connection port 61a.
  • the suction oil passage 63 extends upward from the lower surface of the housing 10.
  • the upper end portion of the suction oil passage 63 communicates with the pump chamber 46 on the other side in the axial direction of the pump chamber 46.
  • a portion of the pump chamber 46 connected to the suction oil passage 63 is a suction port 44.
  • the suction port 44 is, for example, circular.
  • the suction port 44 is disposed below the discharge port 45 and the connection port 61 a.
  • the suction port 44 is disposed below the central axis J1.
  • the suction oil passage 63 has an introduction portion 63 d, a first portion 63 g, and a second portion 63 c.
  • the introduction portion 63 d is provided across the housing 10 and the inner lid 12.
  • the introduction portion 63d is provided across the housing main body 11, the first protrusion 12b, and the inner lid main body 12a.
  • the introductory part 63d has a first introductory part 63e and a second introductory part 63f.
  • the first introduction portion 63e linearly extends upward from the lower surface of the second protrusion 11g.
  • the first introduction portion 63e penetrates the lower wall of the second protrusion 11g in the vertical direction Z, and is provided across the lower wall of the second protrusion 11g and the first protrusion 12b.
  • the lower end of the first introduction portion 63e is an outflow hole 11e.
  • the second introduction portion 63 f linearly extends in one axial direction from the upper end of the first introduction portion 63 e.
  • the end on one axial side of the second introduction portion 63 f opens on the surface on one axial side of the inner lid 12, that is, the surface on the one axial side of the inner lid main body 12 a.
  • the lead-in portion 63d opens on the surface on one side in the axial direction of the inner lid main body 12a.
  • the second introduction portion 63f for example, has a hole 12k axially penetrating the inner lid main body 12a and the first protrusion 12b, and then closes the other axial end of the hole 12k with the plug member 94. It is made.
  • the first portion 63 g is disposed between the inner lid 12 and the outer lid 13.
  • the first portion 63g has a first extending portion 63a and a second extending portion 63b.
  • the first extending portion 63a extends upward from the end portion on one side in the axial direction of the second introduction portion 63f. That is, the first extending portion 63a is connected to the introducing portion 63d and extends in the vertical direction Z.
  • the upper end portion of the first extending portion 63a is located above the inner peripheral surface of the lower end portion of the inner cylindrical portion 12c.
  • the first extending portion 63a is, for example, recessed from the surface on the other side of the cover plate portion 13c in the axial direction, and a groove 63h extending in the vertical direction Z is the axis of the inner lid main portion 12a. It is configured to be closed by a face on one side of the direction. That is, the outer cover 13 has a groove 63h which is recessed from the other side in the axial direction to one side in the axial direction and extends in the vertical direction Z, and the opening of the other side in the axial direction of the groove 63h is the inner cover It is closed by 12 and is constituted.
  • the first extending portion 63 a is disposed between the inner lid 12 and the outer lid 13 in the axial direction.
  • the second extending portion 63 b extends from the upper end portion of the first extending portion 63 a to the other side in the axial direction.
  • the second extending portion 63b is configured such that a groove extending upward from the lower surface of the third projecting portion 13d and extending to the other side in the axial direction is closed by the inner peripheral surface of the inner cylindrical portion 12c.
  • the second extending portion 63 b is disposed between the inner lid 12 and the outer lid 13 in the radial direction.
  • the second portion 63c extends upward from the other axial end of the second extending portion 63b.
  • the second portion 63c is provided to the third protrusion 13d.
  • the second portion 63c is disposed radially inward of the inner cylindrical portion 12c.
  • the second portion 63 c is in communication with the suction port 44.
  • the rotor 20 has a motor shaft 20 a, a rotor core 22, a magnet 23, a first end plate 24, and a second end plate 25.
  • the motor shaft 20 a has a motor shaft body 21 and a mounting member 50.
  • the motor shaft main body 21 has a cylindrical shape extending in the axial direction.
  • the motor shaft main body 21 has a large diameter portion 21a, a first middle diameter portion 21b, a second middle diameter portion 21c, a small diameter portion 21d, and an output portion 21e.
  • the large diameter portion 21 a is a portion to which the rotor core 22 is attached.
  • a male screw portion is provided on the outer peripheral surface of the end portion on one side in the axial direction of the large diameter portion 21a.
  • a nut 90 is tightened on the male screw portion of the large diameter portion 21a.
  • the first middle diameter portion 21b is connected to the large diameter portion 21a on one side in the axial direction of the large diameter portion 21a.
  • the outer diameter of the first middle diameter portion 21b is smaller than the outer diameter of the large diameter portion 21a.
  • the other axial end of the first middle diameter portion 21 b is rotatably supported by the bearing 70.
  • the second medium diameter portion 21c is connected to the large diameter portion 21a on the other side in the axial direction of the large diameter portion 21a.
  • the outer diameter of the second middle diameter portion 21c is smaller than the outer diameter of the large diameter portion 21a.
  • An end on one axial side of the second middle diameter portion 21 c is rotatably supported by the bearing 71.
  • the bearings 70, 71 rotatably support the motor shaft 20a.
  • the bearings 70 and 71 are, for example, ball bearings.
  • the small diameter portion 21 d is connected to the first middle diameter portion 21 b on one side in the axial direction of the first middle diameter portion 21 b.
  • the end on one axial side of the small diameter portion 21 d is the end on one axial side of the motor shaft body 21.
  • the end on one axial side of the small diameter portion 21 d is disposed radially inward of the inner cylindrical portion 12 c.
  • the outer diameter of the small diameter portion 21d is smaller than the outer diameter of the first middle diameter portion 21b. That is, the small diameter portion 21 d is a portion in which the outer diameter decreases toward one side in the axial direction.
  • the output portion 21 e is connected to the second middle diameter portion 21 c on the other side in the axial direction of the second middle diameter portion 21 c.
  • the output portion 21 e is an end on the other side in the axial direction of the motor shaft main body 21.
  • the outer diameter of the output portion 21e is smaller than the outer diameter of the small diameter portion 21d.
  • the output portion 21 e penetrates the bottom portion 11 a in the axial direction and protrudes outside the housing 10.
  • the motor shaft main body 21 has a flange portion 21 f.
  • the flange portion 21 f protrudes radially outward from the outer peripheral surface of the large diameter portion 21 a.
  • the flange portion 21 f has an annular plate shape provided along one circumference of the outer peripheral surface of the large diameter portion 21 a.
  • the flange portion 21 f is provided at the other end of the large diameter portion 21 a in the axial direction.
  • the motor shaft main body 21 has a hole 21 g extending from the end on one axial side of the motor shaft main body 21 to the other axial side.
  • the hole 21 g is a bottomed hole that opens in one side in the axial direction. That is, the other axial end of the hole 21g is closed.
  • the mounting member 50 is fixed to one side of the motor shaft main body 21 in the axial direction.
  • the mounting member 50 is fitted and fixed to the hole 21 g.
  • the mounting member 50 is in the form of a cylinder that opens in the axial direction.
  • the mounting member 50 has a cylindrical shape centered on the central axis J1.
  • the mounting member 50 extends to one side in the axial direction with respect to the motor shaft main body 21 and passes through the second through hole 13 f.
  • the mounting member 50 has a fitting portion 51 and a fixing portion 52.
  • the fitting portion 51 is a portion to be fitted into the hole 21 g.
  • the fitting portion 51 is fixed to the inner peripheral surface of the end portion on one side in the axial direction of the hole 21g, and extends from inside the hole 21g to one side in the axial direction more than the motor shaft main body 21.
  • the axial direction one end of the fitting portion 51 is inserted into the second through hole 13 f. That is, at least a part of the fitting portion 51 is inserted into the second through hole 13 f. Therefore, the radial gap between the outer peripheral surface of the mounting member 50 and the inner peripheral surface of the second through hole 13 f can be increased.
  • the mounting member 50 can be prevented from coming into contact with the inner circumferential surface of the second through hole 13 f.
  • the fixing portion 52 is located on one side in the axial direction of the fitting portion 51.
  • the fixing portion 52 is connected to an end portion on one side in the axial direction of the fitting portion 51.
  • the outer diameter of the fixing portion 52 is larger than the outer diameter of the fitting portion 51 and smaller than the inner diameter of the second through hole 13 f.
  • the fixing portion 52 is inserted into the pump chamber 46.
  • the inner diameter of the fitting portion 51 and the inner diameter of the fixed portion 52 are, for example, the same.
  • an external gear 42 described later is fixed to the mounting member 50.
  • the external gear 42 is fixed to the radially outer surface of the fixing portion 52. More specifically, the fixing portion 52 is fitted and fixed to the fixing hole portion 42 b axially penetrating the external gear 42.
  • the fitting portion 51 having an outer diameter smaller than that of the fixing portion 52 is fitted in the hole 21g, and the external gear 42 is engaged with the fixing portion 52 having an outer diameter larger than the fitting portion 51. Fix it. Therefore, the inner diameter of the hole 21g can be smaller than the inner diameter of the fixed hole 42b of the external gear 42. As a result, the inner diameter of the hole 21g can be relatively easily reduced, and the reduction in the rigidity of the motor shaft main body 21 can be suppressed.
  • the motor shaft 20a has a second oil passage 62 provided inside the motor shaft 20a.
  • the second oil passage 62 is a bottomed hole extending from the end on one axial side of the motor shaft 20a to the other axial side.
  • the second oil passage 62 opens in one axial direction.
  • the second oil passage 62 extends from one axial end of the mounting member 50 to the other axial end of the second middle diameter portion 21 c and is provided across the mounting member 50 and the motor shaft body 21.
  • Be The second oil passage 62 is configured such that the inside of the mounting member 50 and the hole 21 g are connected in the axial direction. That is, the radially inner side surface of the mounting member 50 constitutes a part of the radially inner side surface of the second oil passage 62.
  • the inner edge of the second oil passage 62 in a cross section orthogonal to the axial direction has a circular shape centered on the central axis J1.
  • the inner diameter of the portion provided in the mounting member 50 in the second oil passage 62 is smaller than the inner diameter of the portion provided in the motor shaft main body 21 in the second oil passage 62. That is, the inner diameter of the mounting member 50 is smaller than the inner diameter of the hole 21g.
  • the second oil passage 62 is connected to the first oil passage 61 via the inside of the attachment member 50 by connecting the opening on one axial side of the attachment member 50 to the connection port 61 a. That is, the second oil passage 62 opens to the first oil passage 61 at an end on one side in the axial direction of the motor shaft 20a.
  • the motor shaft 20a has first through holes 26a to 26d connecting the second oil passage 62 and the outer peripheral surface of the motor shaft 20a.
  • the first through holes 26a to 26d extend in the radial direction.
  • the first through holes 26a and 26b are provided in the large diameter portion 21a.
  • the first through holes 26a and 26b are disposed between the nut 90 and the flange portion 21f in the axial direction.
  • the radial outer end of the first through hole 26 a opens in an axial gap 27 a between the first end plate 24 and the rotor core 22.
  • the radially outer end of the first through hole 26 b opens in an axial gap 27 b between the second end plate 25 and the rotor core 22.
  • the first through hole 26c is provided in the first middle diameter portion 21b.
  • the radially outer end of the first through hole 26 c opens radially inward of the bearing holding portion 12 e on one axial side of the bearing 70.
  • the first through holes 26 d are provided in the second middle diameter portion 21 c.
  • the radially outer end of the first through hole 26 d opens radially inward of the bearing holding portion 11 c on the other axial side of the bearing 71.
  • a plurality of first through holes 26a to 26d are provided along the circumferential direction.
  • the rotor core 22 is annular and fixed to the motor shaft body 21.
  • the rotor core 22 is fitted to the large diameter portion 21 a.
  • the rotor core 22 has a magnet insertion hole 22 b which penetrates the rotor core 22 in the axial direction.
  • a plurality of magnet insertion holes 22 b are provided along the circumferential direction.
  • the magnet 23 is inserted into the magnet insertion hole 22b.
  • the first end plate 24 and the second end plate 25 are in the form of a radially expanding annular plate.
  • the large diameter portion 21 a is passed through the first end plate 24 and the second end plate 25.
  • the first end plate 24 and the second end plate 25 sandwich the rotor core 22 in the axial direction in contact with the rotor core 22.
  • the first end plate 24 is disposed on one side in the axial direction of the rotor core 22.
  • the radially outer edge portion of the first end plate 24 protrudes to the other side in the axial direction, and is in contact with the radially outer edge portion of the surface on one axial side of the rotor core 22.
  • the radially outer edge portion of the first end plate 24 axially overlaps the opening on one axial side of the magnet insertion hole 22b, and presses the magnet 23 inserted in the magnet insertion hole 22b from one axial side.
  • a portion radially inward of the radially outer edge portion of the first end plate 24 opposes the surface on one axial side of the rotor core 22 in the axial direction with a gap 27 a therebetween.
  • the first end plate 24 has a jet groove 24 a recessed from the surface on one axial side of the first end plate 24 to the other axial side.
  • the ejection grooves 24 a extend in the radial direction.
  • the radially inner end of the ejection groove 24a penetrates the first end plate 24 in the axial direction and is connected to the gap 27a.
  • the radially outer end of the ejection groove 24 a opens radially outward of the first end plate 24 and radially opposes a coil 32 described later with a gap therebetween.
  • the opening on one axial side of the radially inner portion of the ejection groove 24 a is closed by a washer 91 which is sandwiched and fixed between the nut 90 and the first end plate 24 in the axial direction.
  • the washer 91 is in the form of an annular plate that expands in the radial direction.
  • the second end plate 25 is disposed on the other side of the rotor core 22 in the axial direction.
  • the radially outer edge portion of the second end plate 25 protrudes to one side in the axial direction, and contacts the radially outer edge portion of the surface on the other side in the axial direction of the rotor core 22.
  • the radially outer edge portion of the second end plate 25 axially overlaps the opening on the other side in the axial direction of the magnet insertion hole 22b, and presses the magnet 23 inserted in the magnet insertion hole 22b from the other side in the axial direction.
  • the magnet 23 inserted into the magnet insertion hole 22 b is pressed by the first end plate 24 and the second end plate 25 on both sides in the axial direction. Therefore, it can suppress that the magnet 23 slips out of the magnet insertion hole 22b.
  • the second end plate 25 has a jet groove 25 a which is recessed from the surface on the other side in the axial direction of the second end plate 25 to the one side in the axial direction.
  • the ejection groove 25a extends in the radial direction.
  • the radially inner end of the ejection groove 25a penetrates the second end plate 25 in the axial direction and is connected to the gap 27b.
  • the radially outer end of the ejection groove 25a opens radially outward of the second end plate 25, and is opposed to the coil 32 described later via a gap in the radial direction.
  • the opening on the other axial direction side of the radially inner portion of the ejection groove 25a is closed by the flange portion 21f.
  • the first end plate 24, the rotor core 22 and the second end plate 25 are axially held by the nut 90, the washer 91 and the flange portion 21f.
  • the nut 90 presses the first end plate 24, the rotor core 22 and the second end plate 25 against the flange portion 21f via the washer 91.
  • the first end plate 24, the rotor core 22 and the second end plate 25 are fixed to the motor shaft 20a.
  • a rotation detection unit 80 illustrated in FIG. 1 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 rotation detection unit 80 has a detected unit 81 and a sensor unit 82.
  • the to-be-detected part 81 is an annular shape extended in the circumferential direction.
  • the to-be-detected part 81 is fitted and fixed to the motor shaft 20a. More specifically, the detection portion 81 is fitted and fixed to the small diameter portion 21d.
  • the surface on the other axial direction side of the radially inner edge portion of the detection target portion 81 contacts a step between the first middle diameter portion 21 b and the small diameter portion 21 d.
  • the to-be-detected part 81 overlaps the attachment member 50 in the radial direction.
  • the to-be-detected part 81 is made of a magnetic material.
  • overlapping certain objects in a certain direction includes overlapping certain objects when viewed along a certain direction. That is, overlapping the detection target portion 81 and the attachment member 50 in the radial direction means that the detection target portion 81 and the attachment member 50 overlap when viewed along the radial direction.
  • the sensor unit 82 is disposed between the inner lid 12 and the outer lid 13 in the axial direction. More specifically, the sensor portion 82 is fixed to the surface on one side in the axial direction of the inner cylinder bottom portion 12 d at the inner side in the radial direction of the inner cylinder portion 12 c. That is, the sensor unit 82 is attached to the inner lid 12. Therefore, the sensor unit 82 can be easily attached.
  • the sensor unit 82 is disposed in the second recess 12 g. Therefore, after the inner lid portion 12 is attached to the housing main body portion 11, the sensor portion 82 can be inserted and disposed in the second recess 12g from the opening on one side in the axial direction of the second recess 12g. Therefore, it is easy to arrange the sensor unit 82.
  • the sensor unit 82 has an annular shape surrounding the outside in the radial direction of the detection target 81.
  • the sensor unit 82 has a plurality of coils along the circumferential direction.
  • an induced voltage is generated in the coil of the sensor portion 82 according to the circumferential direction position of the detected portion 81.
  • the sensor unit 82 detects rotation of the detection target unit 81 by detecting the induced voltage.
  • the rotation detection unit 80 detects the rotation of the motor shaft 20 a and detects the rotation of the rotor 20.
  • 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 stator holding portion 11 f in the main cylindrical portion 11 b.
  • the stator core 31 faces the radially outer side of the rotor core 22 via a gap.
  • the cooling device 92 is attached to the lower side of the housing 10. More specifically, the cooling device 92 is fixed in contact with the lower surface of the second protrusion 11g. The cooling device 92 is overlapped with the vertically lower region in the housing portion 14 as viewed in the vertical direction Z.
  • the cooling device 92 has an inlet 92a, an outlet 92b, and a flow passage 92c.
  • the inlet 92 a and the outlet 92 b open to the upper surface of the cooling device 92 fixed to the housing 10.
  • the inlet 92a communicates with the lower end of the inlet 11d.
  • the inflow port 92a is connected with the perpendicular direction lower area
  • the inflow port 92 a allows the oil O stored in the storage unit 14 to flow into the inside of the cooling device 92.
  • the outlet 92b communicates with the lower end of the outlet hole 11e. That is, the outlet 92 b is connected to the suction oil passage 63.
  • the suction oil passage 63 connects the outlet 92 b and the suction port 44.
  • the outlet 92 b causes the oil O to flow from the inside of the cooling device 92 to the suction oil passage 63.
  • the flow path 92 c is provided inside the cooling device 92.
  • the flow path 92 c connects the inlet 92 a and the outlet 92 b.
  • the oil O flowing in from the inflow port 92a flows into the flow path 92c.
  • the cooling device 92 has a refrigerant flow path in which the refrigerant flows around the flow path 92c.
  • the oil O flowing in the flow path 92c is cooled by the refrigerant flowing in the refrigerant flow path.
  • the cooling device 92 cools the oil O flowing inside the cooling device 92.
  • the shape of the flow path 92c and the shape of the refrigerant flow path are not particularly limited as long as the oil O flowing in the flow path 92c can be cooled.
  • the strainer 93 is disposed inside the housing portion 14.
  • the strainer 93 is fixed to, for example, the bottom surface 11 h.
  • the strainer 93 covers the upper opening of the inflow hole 11 d.
  • the strainer 93 has, for example, a plate shape whose plate surface is orthogonal to the vertical direction Z.
  • the strainer 93 has an infinite number of holes axially penetrating the strainer 93.
  • the strainer 93 is, for example, net-like.
  • the innumerable holes of the strainer 93 are smaller than, for example, foreign matter such as wear powder contained in the oil O.
  • the wear powder is generated, for example, when the components of the drive device 1 rub against each other when the drive device 1 is assembled or when the drive device 1 is driven.
  • the oil O stored in the region on the lower side in the vertical direction inside the storage portion 14 passes through the innumerable holes of the strainer 93, and flows into the flow path 92c via the inflow hole portion 11d and the inflow port 92a. That is, the oil O flowing from the vertically lower region in the housing portion 14 to the inflow port 92 a passes through the strainer 93.
  • the pump unit 40 is provided at the center of the outer cover 13.
  • the pump portion 40 is disposed on one side in the axial direction of the motor shaft 20a.
  • the pump unit 40 includes an external gear 42, an internal gear 43, the above-described pump chamber 46, an inlet 44, an outlet 45, and a reservoir 48.
  • the external gear 42 is a gear that can rotate around the central axis J1.
  • the external gear 42 is fixed to one end of the motor shaft 20 a in the axial direction. More specifically, the external gear 42 is fixed to the outer peripheral surface of the fixing portion 52. Therefore, the external gear 42 can be fixed to the motor shaft main body 21 via the mounting member 50.
  • the external gear 42 can be fixed to the motor shaft main body 21 without changing the dimensions of the motor shaft main body 21 and the external gear 42.
  • the external gear 42 is accommodated in the pump chamber 46. As shown in FIG. 3, the external gear 42 has a plurality of teeth 42 a on the outer peripheral surface.
  • the tooth profile of the tooth portion 42a of the external gear 42 is a trochoidal tooth profile.
  • the internal gear 43 is an annular gear that can rotate around a rotation axis J2 that is eccentric with respect to the central axis J1.
  • the internal gear 43 is accommodated in the pump chamber 46.
  • the internal gear 43 surrounds the radially outer side of the external gear 42 and meshes with the external gear 42.
  • the internal gear 43 has a plurality of teeth 43a on the inner peripheral surface.
  • the tooth form of the tooth portion 43a of the internal gear 43 is a trochoidal tooth form.
  • the pump chamber 46 can be configured, and the internal gear 43 and the external gear 42 can be accommodated in the pump chamber 46. Therefore, the assembly of the pump unit 40 can be facilitated.
  • the suction port 44 is connected to the suction oil passage 63. As shown in FIG. 1, the suction port 44 opens to the other axial side of the pump chamber 46. The suction port 44 is connected to the gap between the external gear 42 and the internal gear 43. The suction port 44 receives the oil O stored in the housing portion 14 through the opening 12 f and the suction oil passage 63 in the pump chamber 46, more specifically, in the gap between the external gear 42 and the internal gear 43. Can be inhaled. As shown in FIG. 3, the suction port 44 is disposed above the lower end of the reservoir 48 and above the lower end of the external gear 42.
  • the discharge port 45 is connected to the first oil passage 61. As shown in FIG. 1, the discharge port 45 opens on one side in the axial direction of the pump chamber 46. The discharge port 45 is connected to the gap between the external gear 42 and the internal gear 43. The discharge port 45 can discharge the oil O from the inside of the pump chamber 46, more specifically, from the gap between the external gear 42 and the internal gear 43.
  • the reservoir 48 is connected to the pump chamber 46 on one side in the axial direction of the vertically lower region of the pump chamber 46. As shown in FIG. 3, in the axial direction, the shape of the storage portion 48 is a bow shape that is convex downward. A part of the oil O sucked into the pump chamber 46 from the suction port 44 flows into the reservoir 48.
  • the suction port 44 Since the suction port 44 is disposed above the lower end of the storage section 48, at least a portion of the oil O flowing into the storage section 48 from the suction port 44 even if the pump section 40 stops. Instead of being returned to the inside of the storage unit 14, it is stored in the storage unit 48. Thereby, when the pump unit 40 is stopped, the lower portion of the external gear 42 in the pump chamber 46 and the lower portion of the internal gear 43 are in contact with the oil O in the storage portion 48 Can be Therefore, when the pump portion 40 is driven again, the space between the tooth portion 42a of the external gear 42 and the tooth portion 43a of the internal gear 43, and the inner peripheral surface of the pump chamber 46 and the outer peripheral surface of the internal gear 43. Oil O can be interposed between them, and the occurrence of burn-in can be suppressed.
  • the strainer 93 through which the oil O flowing from the vertically lower region in the inside of the housing portion 14 to the inflow port 92a passes is provided.
  • the strainer 93 can be blocked by the strainer 93, and the foreign matter can be prevented from entering the cooling device 92.
  • the entry of foreign matter from the outlet 92 b into the suction oil passage 63 can be suppressed, and the entry of foreign matter into the pump portion 40 can be suppressed. Therefore, for example, foreign matter can be suppressed from being caught between the external gear 42 and the internal gear 43, and the external gear 42 can be prevented from being unable to rotate relative to the internal gear 43. That is, it can suppress that the pump part 40 is locked.
  • the oil O discharged from the discharge port 45 flows into the first oil path 61, and flows into the second oil path 62 from the connection port 61a. As indicated by the arrows in FIG. 4, the oil O flowing into the second oil passage 62 is subjected to a force radially outward by the centrifugal force of the rotating motor shaft 20a, and the motor passes through the first through holes 26a to 26d. It flows out of the shaft 20a.
  • the oil O flowing out of the first through hole 26a flows into the gap 27a. Then, the oil O that has flowed into the gap 27a is jetted radially outward from the jetting groove 24a.
  • the opening on one axial direction side of the radially inner portion of the ejection groove 24a is closed by the washer 91, so the oil O introduced into the ejection groove 24a is directed radially outward by the washer 91 It's easy to do.
  • the oil O flowing out of the first through hole 26 b flows into the gap 27 b. Then, the oil O that has flowed into the gap 27 b is ejected radially outward from the ejection groove 25 a.
  • the opening on the other axial direction side of the radially inner portion of the ejection groove 25a is closed by the flange portion 21f, so the oil O flowing into the ejection groove 25a is directed radially outward by the flange portion 21f. Easy to guide.
  • the oil O ejected radially outward from the ejection grooves 24 a and 25 a is sprayed to the coil 32.
  • the coil 32 can be cooled by the oil O.
  • the rotor 20 since the second oil passage 62 is provided inside the motor shaft 20a, the rotor 20 can also be cooled by the oil O until it is ejected from the ejection grooves 24a, 25a.
  • the oil O discharged from the discharge port 45 in the present embodiment is led to the rotor 20 and the stator 30.
  • the oil O flowing out of the first through hole 26c is supplied to the bearing 70. Since the first through hole 26 d is opened inward in the radial direction of the bearing holding portion 11 c, the oil O flowing out of the first through hole 26 d is supplied to the bearing 71. Thus, the oil O can be used as a lubricant for the bearings 70, 71.
  • FIG. 4 shows an example in which the oil O is ejected upward from the ejection grooves 24a and 25a
  • the invention is not limited thereto. Since the rotor 20 rotates, the circumferential position of the ejection grooves 24 a and 25 a changes as the rotor 20 rotates. Thus, the direction of the oil O ejected from the ejection grooves 24 a and 25 a changes in the circumferential direction, and the plurality of coils 32 disposed along the circumferential direction can be cooled by the oil O.
  • the pump unit 40 can be driven by the rotation of the motor shaft 20a, and the pump unit 40 sucks up the oil O stored in the housing 10 and supplies it to the rotor 20, the stator 30, and the bearings 70 and 71. be able to.
  • 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 motor shaft main body 21 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 vertically lower region in the housing portion 14. Thereby, the oil O in the accommodating part 14 can be circulated.
  • the cooling device 92 for cooling the oil O flowing inside is provided, and the outlet 92 b of the cooling device 92 is connected to the suction port 44 of the pump unit 40 via the suction oil passage 63. Therefore, the oil O sucked from the suction oil passage 63 to the pump unit 40 can be cooled by the cooling device 92. Thereby, the temperature of the supplied oil O can be reduced, and the rotor 20 and the stator 30 can be further cooled.
  • the cooling device 92 is attached to the lower side of the housing 10, the oil passing through the inside of the cooling device 92 can cool the oil O stored in the inside of the housing portion 14 via the housing 10. Therefore, the oil O sucked into the pump unit 40 can be further cooled.
  • the cooling device 92 is attached to the lower side of the housing 10, it is easy to connect the vertically lower region in the housing portion 14 and the inflow port 92a.
  • the vertically lower region and the inflow port in the housing portion 14 can be easily It can be connected with 92a. Therefore, it is possible to easily form an oil passage connecting the inside of the storage portion 14 in which the oil O is stored and the cooling device 92.
  • the suction oil passage 63 connecting the outflow port 92 b and the suction port 44 has a first portion 63 g disposed between the inner lid 12 and the outer lid 13 which are separate members. Therefore, by fixing the inner lid 12 and the outer lid 13, a part of the suction oil passage 63 can be easily formed. Therefore, it is easy to make the suction oil passage 63.
  • the first portion 63 g may be an axial direction of the inner cover 12 and the outer cover 13 like the first extension 63 a. It is easy to make a portion extending in the vertical direction Z between them. As a result, the first portion 63g can be extended downward, and the first portion 63g can be easily provided to a relatively lower portion of the housing 10. Therefore, the first portion 63 g can be easily brought close to the outlet 92 b of the cooling device 92 attached to the lower side of the housing 10. Therefore, the introduction portion 63d connecting the outflow port 92b and the first portion 63g can be relatively easily shortened, and the introduction portion 63d can be easily formed. Therefore, it is easier to make the suction oil passage 63.
  • the inflow hole 11 d which is an oil passage connecting the inside of the storage portion 14 and the cooling device 92, and the oil which is an oil passage connecting the cooling device 92 and the pump portion 40.
  • drive device 1 which has a structure which is easy to make an oil passage linked to cooling device 92 is obtained.
  • the lead-in portion 63d is provided across the housing main body 11, the first projection 12b, and the inner lid main body 12a, and is provided on one surface of the inner lid main body 12a in the axial direction. Open.
  • the first protrusion 12 b is inserted into the housing main body 11 from the opening on one side in the axial direction of the housing main body 11.
  • the oil O discharged from the discharge port 45 can be sent to the inside of the motor shaft 20a by providing the first oil passage 61 and the second oil passage 62. Further, since the first through holes 26a to 26d are provided, the oil O flowing into the second oil passage 62 can be supplied to the stator 30 and the bearings 70, 71.
  • the second oil passage 62 provided in the motor shaft 20a is opened to the first oil passage 61 connected to the discharge port 45 at one axial end of the motor shaft 20a.
  • the external gear 42 is fixed to an end of the motor shaft 20 a on one side in the axial direction, so the end on the one side of the motor shaft 20 a in the axial direction is disposed relatively close to the discharge port 45. Therefore, the length of the first oil passage 61 connecting the discharge port 45 and the second oil passage 62 can be shortened. Therefore, according to the present embodiment, it is easy to shorten the total length of the oil passage from the opening 12 f to the second oil passage 62. Thus, the oil O can be easily sent to the second oil passage 62 provided inside the motor shaft 20a. Further, the structure of the drive device 1 can be simplified, and the manufacture of the drive device 1 can be facilitated.
  • the radially inner side surface of the mounting member 50 constitutes a part of the radially inner side surface of the second oil passage 62. Therefore, the oil O can be made to flow from the mounting member 50 into the second oil passage 62 while fixing the external gear 42 to the mounting member 50. Thereby, as described above, the motor shaft body 21 and the external gear 42 can be fixed via the mounting member 50 without changing the dimensions of the motor shaft body 21 and the external gear 42, and the second oil The passage 62 can be easily opened to the first oil passage 61.
  • the present invention is not limited to the above-described embodiment, and other configurations can be adopted.
  • the external gear 42 may be directly fixed to the motor shaft body 21 without the attachment member 50.
  • the second oil passage 62 may be provided, for example, only inside the motor shaft body 21.
  • the mounting member 50 may be fixed to the outer peripheral surface of the motor shaft main body 21.
  • the mounting member 50 may be a member having a uniform outer diameter throughout the axial direction. That is, the outer diameter of the fitting portion 51 and the outer diameter of the fixing portion 52 may be the same as each other. In this case, for example, when the outer diameter of the fixing portion 52 is made the same as the outer diameter of the fitting portion 51 shown in FIG. 1 and made smaller, the outer diameter of the external gear 42 to which the fixing portion 52 is fixed can be made smaller. is there. Thereby, the outer diameter of the internal gear 43 can be reduced, and the inner diameter of the pump chamber 46 can be reduced.
  • the outer diameter of the third projecting portion 13d provided with the pump chamber 46 can be reduced, and the radial direction between the radially outer surface of the third projecting portion 13d and the inner circumferential surface of the second recess 12g can be enlarged. Therefore, it is possible to arrange, for example, a portion of the sensor portion 82 that protrudes on one side in the axial direction between the radial outer surface of the third projecting portion 13d and the inner peripheral surface of the second recess 12g. Thus, the sensor unit 82 can be brought closer to the outer cover 13. Thereby, it is easy to miniaturize the entire drive device 1 in the axial direction.
  • the part which protrudes in the axial direction one side among sensor parts 82 is a coil which sensor part 82 has, for example.
  • the mounting member 50 may be configured by two or more members.
  • the mounting member 50 includes a first cylindrical member fitted in the hole 21g, and a second cylindrical member fitted on the first cylindrical member and extending on one side in the axial direction with respect to the motor shaft main body 21. , May be included.
  • the external gear 42 is fixed to an end of the second cylindrical member on one side in the axial direction.
  • the portion of the mounting member 50 that is passed through the second through hole 13 f is the fitting portion 51 whose outer diameter is smaller than that of the fixing portion 52. Therefore, the inner diameter of the second through hole 13f is made smaller than the outer diameter of the fixing portion 52, and the radial gap between the outer peripheral surface of the mounting member 50 and the inner peripheral surface of the second through hole 13f is relatively reduced. Can also be adopted. Thereby, the oil O in the pump chamber 46 can be suppressed from leaking through the second through hole 13 f.
  • the assembler inserts the fitting portion 51 into the second through hole 13f from the opening on the left side of the first recess 13e,
  • the mounting member 50 is fixed to the motor shaft main body 21 by being fitted into the hole 21 g of the motor shaft main body 21.
  • the radially inner end of the closed portion that closes the opening on the other side in the axial direction of the pump chamber 46 can be disposed more radially inward.
  • the closed portion closing the opening on the other side in the axial direction of the pump chamber 46 is a portion of the third projecting portion 13 d on the radially outer side of the second through hole 13 f.
  • the rotor core 22 may be fixed to the outer peripheral surface of the motor shaft main body 21 by press fitting or the like.
  • the first end plate 24 and the second end plate 25 may not be provided.
  • the oil O flowing out of the first through holes 26 a and 26 b may be directly supplied to the coil 32, or a hole connected to the first through hole 26 a is provided in the rotor core 22.
  • Oil O may be supplied to the coil 32 via Also, the oil O may be supplied to the stator core 31.
  • the location to which the oil O discharged from the discharge port 45 is supplied is not specifically limited, For example, you may be supplied only to any one or two of the rotor 20, the stator 30, and the bearings 70 and 71. And may not be supplied to any.
  • the oil O discharged from the discharge port 45 may be supplied to, for example, the inner side surface of the vertically upper region of the storage unit 14. In this case, cooling the housing 10 can indirectly cool the stator 30.
  • any one or more of the first through holes 26a to 26d may not be provided.
  • the tooth shape of the tooth portion 42a of the external gear 42 and the tooth shape of the tooth portion 43a of the internal gear 43 may be a cycloid tooth shape or an involute tooth shape.
  • FIG. 5 is a cross-sectional view showing a part of the drive device of the second embodiment.
  • the inner lid 112 in the housing 110 of the drive device 101 of the present embodiment, the inner lid 112 has a fourth protrusion 112 h.
  • the fourth protrusion 112 h protrudes from the lower end of the inner lid body 12 a to the other side in the axial direction.
  • the lower surface of the fourth protrusion 112 h constitutes a part of the lower surface of the inner lid 112.
  • the fourth protrusion 112 h is disposed axially between the main cylindrical portion 111 b and the outer lid 13 in the housing main portion 111.
  • the other axial end of the fourth protrusion 112 h is in contact with the one axial end of the second protrusion 111 g.
  • the lower surface of the fourth protrusion 112 h contacts the upper surface of the cooling device 92. That is, the lower surface of the inner lid 112 contacts the cooling device 92.
  • the second protrusion 111 g does not have the outflow hole 11 e.
  • a seal member 195 is disposed between the lower surface of the fourth protrusion 112 h and the upper surface of the cooling device 92.
  • the seal member 195 seals between the lower surface of the fourth protrusion 112 h and the upper surface of the cooling device 92.
  • the seal member 195 has an annular shape surrounding the lower end portion of the introduction portion 163d. Thereby, oil O passing through the introduction portion 163d can be prevented from leaking from between the lower surface of the fourth protrusion 112h and the upper surface of the cooling device 92.
  • the seal member 195 is, for example, an O-ring.
  • the introduction portion 163 d is a linearly extending through hole. Therefore, the introduction part 163d can be made by one hole processing. Thereby, the introductory part 163d can be easily made. Therefore, it is easier to make an oil passage connected to the cooling device 92.
  • the introduction portion 163 d extends in a direction inclined with respect to the vertical direction Z, and is positioned on one side in the axial direction from the lower side to the upper side. Therefore, even when the outflow port 92b is disposed on the other axial side with respect to the first portion 63g, the outflow port 92b and the first portion 63g can be connected while the introduction portion 163d is a through hole.
  • One end of the introduction portion 163d opens to the lower surface of the fourth protrusion 112h. That is, one end of the introduction portion 163 d opens in the lower surface of the inner lid 112.
  • One end of the introduction portion 163d is connected to the outlet 92b.
  • the other end of the lead-in portion 163d opens in the surface on one side in the axial direction of the inner lid body 12a. That is, the other end of the lead-in portion 163 d is open to the surface on one side in the axial direction of the inner lid portion 112.
  • the other end of the introduction portion 163d is connected to the first portion 63g.
  • the lead-in portion 163 d is provided only to the inner lid 112.
  • the inner lid portion 112 is easily subjected to a hole processing that obliquely penetrates from the surface on the lower side of the inner lid portion 112 to the surface on one side in the axial direction. You can make Therefore, it is easier to make an oil passage connected to the cooling device 92.
  • FIG. 6 is a cross-sectional view showing a part of the drive device of the third embodiment.
  • the inner lid 212 does not have the first protrusion 12b unlike the first embodiment.
  • the lower surface of the outer lid 213 is in contact with the cooling device 92.
  • the introduction portion 263 d is a through hole extending linearly along the vertical direction Z. Therefore, as in the second embodiment, the introduction portion 263d can be easily made. Therefore, it is easier to make an oil passage connected to the cooling device 92.
  • One end of the introduction portion 263 d opens to the lower surface of the outer lid 213.
  • One end of the introduction portion 263d is connected to the outlet 92b.
  • the other end of the introduction portion 263d opens to the inner surface of the groove 63h. More specifically, the other end of the introduction portion 263d opens to the lower surface of the inner surface of the groove 63h.
  • the introductory portion 263 d is connected to the first portion 63 g.
  • the introductory portion 263 d is provided only on the outer lid 213. Therefore, according to the present embodiment, the outer lid portion 213 is easily drilled by penetrating the hole in the vertical direction Z from the lower surface of the outer lid portion 213 to the inner side surface of the groove 63 h. It can make 263d. Therefore, it is easier to make an oil passage connected to the cooling device 92.
  • the shape of an introductory part will not be specifically limited if it connects an outflow port and a 1st part.
  • the lead-in portion may extend in a curvilinear manner or may have a linearly extending portion and a curvilinearly extending portion.
  • the first portion is not particularly limited as long as it is disposed between the inner lid and the outer lid.
  • the first portion may be formed by closing the opening of the groove provided in the inner lid portion by the outer lid portion.
  • a strainer may be provided in the suction oil passage. In this case, for example, the strainer may close the end of the introduction portion that opens to the first portion.
  • the pump chamber may be provided at any position as long as it is provided in the housing.
  • the pump chamber may be provided, for example, in the inner lid.
  • a pump part is driven via a motor shaft, it will not be specifically limited.
  • the rotational driving force of the motor shaft may be indirectly transmitted to the pump unit.
  • the external gear of the pump portion may be connected to the motor shaft via another gear and shaft without being directly fixed to the motor shaft. In this case, the rotational driving force of the motor shaft is transmitted to the external gear of the pump portion via the other gear and shaft.
  • the application of the drive device of embodiment mentioned above is not specifically limited.
  • the drive device of the embodiment described above is mounted on, for example, a vehicle.
  • each structure mentioned above can be combined suitably in the range which does not contradiction mutually.

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

Abstract

Selon un mode de réalisation, la présente invention concerne un dispositif d'entraînement comprenant un rotor, un stator, un carter ayant une section de stockage pouvant stocker de l'huile, une unité pompe menée par un arbre moteur, et un dispositif de refroidissement fixé au carter sur son côté inférieur dans la direction verticale. Le dispositif de refroidissement comprend : un orifice d'entrée qui est relié à la région côté inférieur dans la direction verticale de l'intérieur de la section de stockage, et par lequel l'huile stockée dans la section de stockage s'écoule dans le dispositif de refroidissement ; et un orifice de refoulement permettant de refouler l'huile de l'intérieur du dispositif de refroidissement. Le dispositif de refroidissement refroidit l'huile qui le traverse. Le carter possède une section de couvercle interne permettant de recouvrir un côté du stator dans la direction axiale, une section de couvercle externe fixée à la section de couvercle interne sur un côté dans la direction axiale, et un canal d'admission d'huile qui relie l'orifice de refoulement et l'orifice d'entrée. La section de couvercle interne et la section de couvercle externe sont des éléments séparés. Le canal d'admission d'huile comporte une première section positionnée entre la section de couvercle interne et la section de couvercle externe et comporte une section d'introduction reliant l'orifice de refoulement et la première section.
PCT/JP2018/023303 2017-09-08 2018-06-19 Dispositif d'entraînement WO2019049464A1 (fr)

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CN116207924A (zh) * 2023-02-13 2023-06-02 苏州朗高电机有限公司 一种应用于重型卡车的油冷驱动电机

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US20120305226A1 (en) * 2011-06-03 2012-12-06 Remy Technologies, Llc Electric machine module cooling system and method
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CN116207924A (zh) * 2023-02-13 2023-06-02 苏州朗高电机有限公司 一种应用于重型卡车的油冷驱动电机
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