WO2018030325A1 - Dispositif d'entraînement - Google Patents

Dispositif d'entraînement Download PDF

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Publication number
WO2018030325A1
WO2018030325A1 PCT/JP2017/028552 JP2017028552W WO2018030325A1 WO 2018030325 A1 WO2018030325 A1 WO 2018030325A1 JP 2017028552 W JP2017028552 W JP 2017028552W WO 2018030325 A1 WO2018030325 A1 WO 2018030325A1
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WO
WIPO (PCT)
Prior art keywords
motor shaft
axial direction
pump chamber
oil passage
axial
Prior art date
Application number
PCT/JP2017/028552
Other languages
English (en)
Japanese (ja)
Inventor
貴之 右田
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 JP2018533024A priority Critical patent/JPWO2018030325A1/ja
Priority to US16/323,632 priority patent/US10958137B2/en
Priority to DE112017004013.2T priority patent/DE112017004013B4/de
Priority to CN201780049084.XA priority patent/CN109565223B/zh
Publication of WO2018030325A1 publication Critical patent/WO2018030325A1/fr

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Classifications

    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • 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
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/225—Detecting coils

Definitions

  • the present invention relates to a drive device.
  • a rotating electric machine includes a case for storing a lubricating fluid for lubrication and cooling such as a stator and a rotor.
  • Patent Document 1 describes a rotating electrical machine mounted on a vehicle.
  • the rotating electrical machine as described above may be provided with a pump unit that sucks up 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 shaft and the pump unit are simply connected, it may be time-consuming to assemble the rotating electric machine, for example, it is necessary to fix the external gear to the shaft after the shaft is inserted into the pump chamber.
  • One aspect of the drive device includes 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 is opposed to the rotor via a gap in a radial direction. And a housing having a housing portion that accommodates the rotor and the stator and can store oil, and a pump portion that is driven via the motor shaft, the housing being a shaft of the motor shaft.
  • the motor shaft has a suction port capable of sucking oil into the pump chamber and a discharge port capable of discharging oil from the pump chamber, and the motor shaft includes a motor shaft body to which the rotor core is fixed, and the motor shaft body.
  • the closure member overlaps with the internal gear as viewed in the axial direction and closes at least a part of the opening on the other axial side of the pump chamber.
  • a drive device that drives a pump unit using a motor shaft and has a structure that can reduce the labor of assembly.
  • FIG. 1 is a cross-sectional view showing the drive device of the present embodiment.
  • FIG. 2 is a view of the pump unit of this embodiment as viewed from the other side in the axial direction.
  • FIG. 3 is a cross-sectional view showing a part of the driving apparatus of the present embodiment.
  • the Z-axis direction shown in each figure is a vertical direction Z in which the positive side is the upper side and the negative side is the lower side.
  • the vertical direction Z is the vertical direction of each 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 housing 10, a rotor 20 having a motor shaft 20 a disposed along a central axis J ⁇ b> 1 extending in one direction, a rotation detection unit 80, and a stator 30. And a pump unit 40 and bearings 70 and 71. *
  • the central axis J1 extends in the left-right direction in FIG. That is, in the present embodiment, the left-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 the center.
  • the circumferential direction is simply called “circumferential direction”.
  • the left side of FIG. 1 in the axial direction is referred to as “one axial side”
  • the right side of FIG. 1 in the axial direction is referred to as “the other axial side”. *
  • the housing 10 includes a main body portion 11, an inner lid portion 12, and an outer lid portion 13.
  • the main body 11, the inner lid 12, and the outer lid 13 are separate members.
  • the main body 11 has a bottomed cylindrical shape that opens to one side in the axial direction.
  • the main body part 11 includes a bottom part 11a, a main body cylinder part 11b, and a bearing holding part 11c.
  • the bottom portion 11a has an annular plate shape that expands in the radial direction.
  • the main body cylinder portion 11b has a cylindrical shape extending from the radially outer edge portion of the bottom portion 11a to one side in the axial direction.
  • the bearing holding portion 11c has a cylindrical shape protruding from the inner edge portion of the bottom portion 11a to one side in the axial direction.
  • the bearing holding portion 11c holds the bearing 71 on the inner peripheral surface. *
  • the inner lid portion 12 is attached to one side of the main body portion 11 in the axial direction.
  • the inner lid portion 12 includes an annular plate portion 12a, an outer cylinder portion 12b, an inner cylinder portion 12c, an inner cylinder bottom portion 12d, and a bearing holding portion 12e.
  • the annular plate portion 12a has an annular plate shape that extends in the radial direction.
  • the annular plate portion 12 a covers one side of the stator 30 in the axial direction. That is, the inner lid portion 12 covers one side of the stator 30 in the axial direction.
  • An opening 12f that penetrates the annular plate portion 12a in the axial direction is provided at the lower end portion of the annular plate portion 12a. The opening 12f is exposed to the accommodating portion 14 described later. *
  • the outer cylinder part 12b is a cylindrical shape extended from the radial direction outer edge part of the annular plate part 12a to the other side of an axial direction.
  • the end portion on the other side in the axial direction of the outer tube portion 12b is fixed in contact with the end portion on the one side in the axial direction of the main body tube portion 11b.
  • the inner cylinder 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 inner cylinder bottom portion 12d has an annular shape that extends radially inward from the other axial end of the inner cylinder portion 12c.
  • the bearing holding portion 12e has a cylindrical shape that protrudes from the surface on the other axial side of the inner cylinder bottom portion 12d to the other axial side.
  • the bearing holding part 12e holds the bearing 70 on the inner peripheral surface. That is, the inner lid portion 12 holds the bearing 70.
  • the main body part 11 and the inner lid part 12 are fixed to each other, whereby the housing part 14 surrounded by the main body part 11 and the inner lid part 12 is configured. That is, the housing 10 has the accommodating portion 14.
  • the accommodating portion 14 accommodates the rotor 20 and the stator 30 and can store the oil O.
  • the oil O is stored in the lower region in the vertical direction of the storage unit 14.
  • the “lower region in the vertical direction of the housing portion” includes a portion located below the center in the vertical direction Z of the housing portion.
  • the liquid surface OS of the oil O stored in the storage unit 14 is located above the opening 12f. As a result, the opening 12 f is exposed to the oil O stored in the storage portion 14.
  • the liquid surface OS of the oil O fluctuates as the oil O is sucked up by the pump unit 40, but is disposed below the rotor 20 at least when the rotor 20 rotates. Thereby, when the rotor 20 rotates, it can suppress that the oil O becomes rotational resistance of the rotor 20.
  • the outer lid portion 13 is attached to one side in the axial direction of the inner lid portion 12.
  • the outer lid portion 13 includes a lid plate portion 13a and a protruding portion 13b.
  • the lid plate portion 13a has a disk shape that expands in the radial direction.
  • the cover plate part 13a covers one axial side of the motor shaft 20a. That is, the outer lid portion 13 covers one axial side of the motor shaft 20a.
  • the radial outer edge portion of the lid plate portion 13a is fixed to the radial outer edge portion of the annular plate portion 12a.
  • the surface on the other side in the axial direction of the cover plate portion 13a is in contact with the surface on the one side in the axial direction of the annular plate portion 12a.
  • the protruding portion 13b protrudes from the central portion of the lid plate portion 13a to the other side in the axial direction.
  • the protruding portion 13b is inserted and fitted into the inner cylinder portion 12c from one side in the axial direction.
  • the protruding portion 13b is arranged at an interval on one side in the axial direction of the inner cylinder bottom portion 12d.
  • a pump chamber 46 is provided in the outer lid portion 13.
  • the pump chamber 46 is recessed from the surface on the other axial side of the outer lid portion 13 to the one axial side. More specifically, the pump chamber 46 is recessed from the surface on the other axial side of the protruding portion 13b to the one axial side.
  • the pump chamber 46 is disposed on the radially inner side of the inner cylindrical portion 12c.
  • the central axis J1 passes through the pump chamber 46.
  • the outer shape of the pump chamber 46 is circular when viewed in the axial direction.
  • the pump chamber 46 accommodates an internal gear 43 and an external gear 42 which will be described later. *
  • the housing 10 includes a first oil passage 61 and a third oil passage 63.
  • the first oil passage 61 is provided in the outer lid portion 13.
  • the first oil passage 61 is disposed on one axial side 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 axial side of the pump chamber 46.
  • An upper end portion connected to the first oil passage 61 in the pump chamber 46 is a discharge port 45. That is, the first oil passage 61 is connected to the discharge port 45.
  • a central portion connected to the first oil passage 61 in the pump chamber 46 is a connection port 61a.
  • the discharge port 45 and the connection port 61a are, for example, circular.
  • the discharge port 45 is disposed above the connection port 61a.
  • the central axis J1 passes through the connection port 61a. *
  • the third oil passage 63 extends upward from the opening 12f.
  • the third oil passage 63 is connected to the lower region in the vertical direction of the accommodating portion 14 through the opening 12f.
  • the upper end portion of the third oil passage 63 is connected to the pump chamber 46 on the other axial side of the pump chamber 46.
  • the portion where the third oil passage 63 is connected in the pump chamber 46 is the suction port 44. That is, the third oil passage 63 connects the lower region in the vertical direction of the housing portion 14 to the suction port 44.
  • the suction port 44 has, for example, a circular shape.
  • the suction port 44 is disposed below the discharge port 45 and the connection port 61a.
  • the suction port 44 is disposed below the central axis J1. *
  • the third oil passage 63 has a first portion 63a and a second portion 63b.
  • the first portion 63a extends upward from the opening 12f and opens on the inner peripheral surface of the lower end portion of the inner cylinder portion 12c.
  • a groove extending in the vertical direction Z from the surface on one axial side of the annular plate portion 12a and extending in the vertical direction Z is closed by the surface on the other axial side of the lid plate portion 13a. Composed. Accordingly, the first portion 63a is disposed between the inner lid portion 12 and the outer lid portion 13 in the axial direction.
  • the second portion 63b is connected to the upper end portion of the first portion 63a.
  • the second portion 63b is disposed on the radially inner side of the inner cylinder portion 12c.
  • the second portion 63 b is connected to the suction port 44.
  • the second portion 63b is configured, for example, by closing the opening on the one axial side of the inner cylinder portion 12c with the outer lid portion 13. Accordingly, the second portion 63b is disposed between the inner lid portion 12 and the outer lid portion 13 in the axial direction.
  • at least a part of the third oil passage 63 is disposed between the inner lid portion 12 and the outer lid portion 13 in the axial direction.
  • the third oil passage 63 can be configured by the inner lid portion 12 and the outer lid portion 13 fixed to each other, and the third oil passage 63 can be easily manufactured. In the present embodiment, since the entire third oil passage 63 is disposed between the inner lid portion 12 and the outer lid portion 13 in the axial direction, the third oil passage 63 can be more easily manufactured.
  • the rotor 20 includes 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 includes a motor shaft main body 21 and a closing member 50.
  • the motor shaft 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 medium diameter portion 21b, a second medium diameter portion 21c, a small diameter portion 21d, and an output portion 21e. *
  • the large diameter portion 21a 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 axial side of the large diameter portion 21a.
  • a nut 90 is fastened to the male screw portion of the large diameter portion 21a.
  • the first medium diameter portion 21b is connected to the large diameter portion 21a on one axial side of the large diameter portion 21a.
  • the outer diameter of the first medium diameter portion 21b is smaller than the outer diameter of the large diameter portion 21a.
  • the end portion on the other axial side of the first medium diameter portion 21b is rotatably supported by the bearing 70. *
  • the second medium diameter portion 21c is connected to the large diameter portion 21a on the other axial side of the large diameter portion 21a.
  • the outer diameter of the second medium diameter portion 21c is smaller than the outer diameter of the large diameter portion 21a.
  • the end portion on the one axial side of the second medium diameter portion 21c is rotatably supported by the bearing 71.
  • the bearings 70 and 71 rotatably support the motor shaft 20a.
  • the bearings 70 and 71 are ball bearings, for example. *
  • the small diameter portion 21d is connected to the first medium diameter portion 21b on one axial side of the first medium diameter portion 21b.
  • An end portion on one side in the axial direction of the small diameter portion 21 d is an end portion on one side in the axial direction of the motor shaft main body 21.
  • the end portion on one side in the axial direction of the small diameter portion 21d is disposed on the radially inner side of the inner cylinder portion 12c.
  • the outer diameter of the small diameter portion 21d is smaller than the outer diameter of the first medium diameter portion 21b. That is, the small diameter portion 21d is a portion whose outer diameter decreases toward one side in the axial direction.
  • the output part 21e is connected to the second medium diameter part 21c on the other axial side of the second medium diameter part 21c.
  • the output portion 21e is an end portion on the other side in the axial direction of the motor shaft main body 21.
  • the outer diameter of the output part 21e is smaller than the outer diameter of the small diameter part 21d.
  • the output portion 21e protrudes outside the housing 10 through the bottom portion 11a in the axial direction.
  • the motor shaft main body 21 has a flange portion 21f.
  • the flange portion 21f protrudes radially outward from the outer peripheral surface of the large diameter portion 21a.
  • the flange portion 21f has an annular plate shape that is provided over the circumference of the outer peripheral surface of the large diameter portion 21a.
  • the flange portion 21f is provided at the end portion on the other axial side of the large diameter portion 21a.
  • the closing member 50 is fixed to the motor shaft main body 21 on one side in the axial direction of the motor shaft main body 21.
  • the closing member 50 has a cylindrical shape that is fitted to the motor shaft main body 21. More specifically, the closing member 50 has a cylindrical shape centered on the central axis J1, and is fitted and fixed to the small diameter portion 21d from one side in the axial direction.
  • the closing member 50 opens on both sides in the axial direction.
  • the closing member 50 is disposed on the radially inner side of the inner cylinder portion 12c. *
  • the closing member 50 includes a closing main body portion 51 and a fixing portion 52.
  • the closing main body 51 has a cylindrical shape that is fitted and fixed to the small diameter portion 21d.
  • the closing main body 51 includes a closing lid part 51a and a fitting part 51b.
  • the closing lid portion 51a has an annular plate shape centering on the central axis J1 and extending in the radial direction.
  • the closing lid 51 a closes a part of the opening on the other axial side of the pump chamber 46. That is, the closing member 50 closes at least a part of the opening on the other axial side of the pump chamber 46.
  • the outer diameter of the closing lid portion 51 a is smaller than the inner diameter of the pump chamber 46. Therefore, the closing lid portion 51 a closes a part on the radially inner side of the opening on the other axial side of the pump chamber 46.
  • the radially outer edge portion of the closing lid portion 51a overlaps with the internal gear 43 when viewed in the axial direction. That is, the closing member 50 overlaps with the internal gear 43 when viewed in the axial direction.
  • the closing lid 51a supports the internal gear 43 from the other side in the axial direction.
  • the end surface on one side in the axial direction of the small diameter portion 21d is in contact with the surface on the other side in the axial direction of the closing lid portion 51a.
  • the fitting portion 51b has a cylindrical shape extending from the radially outer edge portion of the closing lid portion 51a to the other side in the axial direction. The fitting portion 51b is fitted into the small diameter portion 21d from the outside in the radial direction.
  • the fixing portion 52 has a cylindrical shape extending from the closing main body portion 51 to one side in the axial direction. More specifically, the fixing portion 52 has a cylindrical shape that extends from the radially inner edge of the closing lid portion 51a toward the one axial side with the central axis J1 as the center. The fixing portion 52 has an outer diameter smaller than that of the closing main body portion 51.
  • the fixing portion 52 is inserted into the pump chamber 46.
  • the end surface on one side in the axial direction of the fixed portion 52 is in contact with the surface on one side in the axial direction of the pump chamber 46.
  • the opening on the one side in the axial direction of the fixed portion 52 is connected to the connection port 61a so as to face in the axial direction. *
  • 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 that extends from the end on one side in the axial direction of the motor shaft 20a to the other side in the axial direction.
  • the second oil passage 62 opens on one side in the axial direction.
  • the second oil passage 62 extends from the end on one side in the axial direction of the closing member 50 to the end on the other side in the axial direction of the second medium diameter portion 21c, and is provided across the closing member 50 and the motor shaft main body 21. It is done.
  • the second oil passage 62 is configured by connecting the inside of the fixed portion 52 and a hole portion recessed in the other axial direction from the end on one axial direction of the motor shaft body 21 in the axial direction. That is, the radially inner side surface of the closing 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 has a circular shape centering on the central axis J1 in a cross section orthogonal to the axial direction.
  • the inner diameter of the portion provided in the closing 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 fixed portion 52 is smaller than the inner diameter of the hole portion that constitutes the second oil passage 62 provided in the motor shaft main body 21.
  • the second oil passage 62 is connected to the first oil passage 61 by connecting the opening on the one axial side of the fixed portion 52 to the connection port 61 a. That is, the second oil passage 62 opens into the first oil passage 61 at the end portion on the one axial side of the motor shaft 20a.
  • the motor shaft 20a has first through holes 26a to 26d that connect 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 radially outer end of the first through hole 26 a opens in the 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 the 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 medium diameter portion 21b.
  • the radially outer end of the first through hole 26c opens on the radially inner side of the bearing holding portion 12e on one axial side of the bearing 70.
  • the first through hole 26d is provided in the second medium diameter portion 21c.
  • the radially outer end of the first through hole 26d opens on the radially inner side of the bearing holding portion 11c 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 has an annular shape fixed to the motor shaft main body 21.
  • the rotor core 22 is fitted into the large diameter portion 21a.
  • the rotor core 22 has a magnet insertion hole 22b that penetrates the rotor core 22 in the axial direction.
  • a plurality of magnet insertion holes 22b 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 have an annular plate shape that expands in the radial direction.
  • a 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 while being in contact with the rotor core 22.
  • the first end plate 24 is disposed on one axial side 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 contacts the radially outer edge portion of the surface on the one axial side of the rotor core 22.
  • the radially outer edge of the first end plate 24 overlaps with the opening on one axial side of the magnet insertion hole 22b in the axial direction, and presses the magnet 23 inserted into the magnet insertion hole 22b from one axial side.
  • a portion radially inward from the radially outer edge portion of the first end plate 24 faces the surface on one side in the axial direction of the rotor core 22 in the axial direction through a gap 27a.
  • the first end plate 24 has an ejection groove 24 a that is recessed from the surface on one side in the axial direction of the first end plate 24 toward the other side in the axial direction.
  • the ejection groove 24a extends 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 24a opens to the radially outer side of the first end plate 24, and opposes a coil 32, which will be described later, with a gap in the radial direction.
  • the opening on the one axial side in the radially inner portion of the ejection groove 24 a is closed by a washer 91 that is sandwiched and fixed between the nut 90 and the first end plate 24 in the axial direction.
  • the washer 91 has an annular plate shape that expands in the radial direction.
  • the second end plate 25 is disposed on the other axial side of the rotor core 22.
  • the radially outer edge portion of the second end plate 25 projects to one side in the axial direction and contacts the radially outer edge portion of the surface on the other axial side of the rotor core 22.
  • the radially outer edge of the second end plate 25 overlaps the opening on the other axial side of the magnet insertion hole 22b in the axial direction, and presses the magnet 23 inserted into the magnet insertion hole 22b from the other axial side.
  • the magnet 23 inserted into the magnet insertion hole 22b is pressed by the first end plate 24 and the second end plate 25 on both sides in the axial direction. Therefore, the magnet 23 can be prevented from coming out of the magnet insertion hole 22b.
  • the radially inner portion of the second end plate 25 is radially opposed to the surface on the other axial side of the rotor core 22 via the gap 27b.
  • the second end plate 25 has an ejection groove 25 a that is recessed from the surface on the other axial side of the second end plate 25 to the one axial side.
  • 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 to the radially outer side of the second end plate 25, and opposes the coil 32, which will be described later, with a gap in the radial direction.
  • the opening on the other side in the axial direction in 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 sandwiched in the axial direction 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 1st end plate 24, the rotor core 22, and the 2nd end plate 25 are fixed to the motor shaft 20a.
  • the rotation detector 80 shown in FIG. 1 detects the rotation of the rotor 20.
  • the rotation detection unit 80 is, for example, a VR (Variable Reluctance) type resolver.
  • the rotation detector 80 is disposed on the radially inner side of the inner cylinder portion 12c.
  • the rotation detection unit 80 includes a detected unit 81 and a sensor unit 82. *
  • the detected part 81 has an annular shape extending in the circumferential direction.
  • the detected part 81 is fitted and fixed to the motor shaft 20a. More specifically, the detected portion 81 is fitted and fixed to the small diameter portion 21d.
  • the surface on the other axial side of the radially inner edge of the detected portion 81 is in contact with the step between the first medium diameter portion 21b and the small diameter portion 21d.
  • the surface on the one axial side of the radially inner edge of the detected portion 81 is in contact with the end surface on the other axial side of the fitting portion 51b. That is, the detected portion 81 is sandwiched in the axial direction in a state where it is in contact with the blocking member 50 and the step on the other axial side of the small diameter portion 21d. Therefore, the detected portion 81 is positioned in the axial direction and held by the motor shaft 20a, and is prevented from coming off from the motor shaft main body 21 to the one side in the axial direction.
  • the detected part 81 is made of a magnetic material
  • the sensor portion 82 is disposed between the inner lid portion 12 and the outer lid portion 13 in the axial direction. More specifically, the sensor part 82 is fixed to the surface on the one axial side of the inner cylinder bottom part 12d on the radially inner side of the inner cylinder part 12c. That is, the sensor unit 82 is attached to the inner lid unit 12. Therefore, it is easy to attach the sensor unit 82.
  • the sensor unit 82 has an annular shape that surrounds the radially outer side of the detected portion 81.
  • the sensor unit 82 has a plurality of coils along the circumferential direction. When the detected portion 81 rotates together with the motor shaft 20a, an induced voltage corresponding to the circumferential position of the detected portion 81 is generated in the coil of the sensor portion 82.
  • the sensor unit 82 detects the rotation of the detected unit 81 by detecting the induced voltage. Thereby, the rotation detector 80 detects the rotation of the rotor 20 by detecting the rotation of the motor shaft 20a.
  • the stator 30 faces the rotor 20 via a gap in the radial direction.
  • the stator 30 includes a stator core 31 and a plurality of coils 32 attached to 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 cylinder portion 11b.
  • the stator core 31 is opposed to the outer side in the radial direction of the rotor core 22 via a gap. *
  • the pump unit 40 is provided at the center of the outer lid unit 13.
  • the pump part 40 is arrange
  • the pump unit 40 includes an external gear 42, an internal gear 43, the above-described pump chamber 46, a suction port 44, a discharge port 45, and a storage unit 48.
  • the external gear 42 is a gear that can rotate around the central axis J1.
  • the external gear 42 is fixed to an end portion on one axial side of the motor shaft 20a. 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 closing member 50. Thereby, 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 by adjusting the dimensions of the closing member 50.
  • the surface on the other axial side of the external gear 42 is in contact with the surface on the one axial side of the closing lid portion 51a.
  • the external gear 42 is accommodated in the pump chamber 46. As shown in FIG. 2, the external gear 42 has a plurality of tooth portions 42a 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 is rotatable 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 tooth portions 43a on the inner peripheral surface.
  • the tooth profile of the tooth portion 43a of the internal gear 43 is a trochoidal tooth profile.
  • the suction port 44 is connected to the third 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 a gap between the external gear 42 and the internal gear 43. The suction port 44 allows the oil O stored in the storage portion 14 to pass through the opening 12f and the third oil passage 63 in the pump chamber 46, more specifically, between the external gear 42 and the internal gear 43. Inhalable. As shown in FIG. 2, the suction port 44 is disposed above the lower end of the storage portion 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 axial side of the pump chamber 46. The discharge port 45 is connected to a 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 axial side of the lower region in the vertical direction of the pump chamber 46.
  • the shape of the storage portion 48 is an arc shape that protrudes downward when viewed in the axial direction. Part of the oil O sucked into the pump chamber 46 from the suction port 44 flows into the storage portion 48.
  • the suction port 44 is disposed above the lower end of the storage unit 48, even when the pump unit 40 is stopped, at least a part of the oil O that has flowed into the storage unit 48 flows from the suction port 44. It is stored in the storage unit 48 without returning to the storage unit 14. Thereby, when the pump part 40 is stopped, the lower part of the external gear 42 in the pump chamber 46 and the lower part of the internal gear 43 are in contact with the oil O in the storage part 48. Can be.
  • the oil O that has flowed into the second oil passage 62 receives a force radially outward due to the centrifugal force of the rotating motor shaft 20a, passes through the first through holes 26a to 26d, and the motor. It flows out of the shaft 20a.
  • the oil O flowing out of the first through hole 26a flows into the gap 27a.
  • the oil O which flowed into the clearance gap 27a is ejected toward the radial direction outer side from the ejection groove 24a.
  • the opening on the one axial side in the radially inner portion of the ejection groove 24 a is closed by the washer 91, so that the oil O that has flowed into the ejection groove 24 a is guided radially outward by the washer 91. It's easy to do. *
  • the oil O flowing out of the first through hole 26b flows into the gap 27b.
  • the oil O which flowed into the clearance gap 27b is ejected toward the radial direction outer side from the ejection groove 25a.
  • the opening on the other axial side in the radially inner portion of the ejection groove 25a is closed by the flange portion 21f, so the oil O that has flowed into the ejection groove 25a is directed radially outward by the flange portion 21f. Easy to guide. *
  • Oil O ejected radially outward from the ejection grooves 24 a and 25 a is sprayed to the coil 32. Thereby, the coil 32 can be cooled by the oil O.
  • the second oil passage 62 is provided inside the motor shaft 20a, the rotor 20 can be cooled by the oil O until it is ejected from the ejection grooves 24a and 25a.
  • the oil O discharged from the discharge port 45 in the present embodiment is guided 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 26d opens to the inside of the bearing holding portion 11c in the radial direction, the oil O flowing out of the first through hole 26d is supplied to the bearing 71. Thereby, the oil O can be used as a lubricant for the bearings 70 and 71.
  • FIG. 3 shows an example in which the oil O is ejected upward from the ejection grooves 24a and 25a
  • the present invention is not limited to this. Since the rotor 20 rotates, the circumferential positions of the ejection grooves 24 a and 25 a change as the rotor 20 rotates. Thereby, the direction of the oil O ejected from the ejection grooves 24a and 25a changes in the circumferential direction, and the plurality of coils 32 arranged 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 oil O stored in the housing 10 is sucked up by the pump unit 40 and supplied to the rotor 20, the stator 30, and the bearings 70 and 71. be able to.
  • the oil O 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 body 21 can be improved.
  • the oil O supplied to the stator 30 and the bearings 70 and 71 falls in the housing portion 14 and is stored again in the lower region of the housing portion 14. Thereby, the oil O in the accommodating part 14 can be circulated.
  • the opening on the other axial side of the pump chamber 46 is closed by the closing member 50 of the motor shaft 20a. Therefore, with the external gear 42 fixed to the motor shaft 20a, the end of the motor shaft 20a on one side in the axial direction is inserted into the pump chamber 46 together with the external gear 42, so that the external gear 42 is connected to the pump chamber. At the same time, the opening on the other axial side of the pump chamber 46 can be closed by the closing member 50. Therefore, it is possible to reduce the time and effort for assembling the drive device 1 and to easily prevent the structure of the drive device 1 from becoming complicated. *
  • the closing member 50 that closes the pump chamber 46 rotates together with the external gear 42, the closing member 50 is oil against the oil O that flows between the external gear 42 and the internal gear 43. It moves in the same circumferential direction as that of O. As a result, the oil O in the pump chamber 46 can be easily sent from the suction port 44 to the discharge port 45.
  • the oil O discharged from the discharge port 45 can be sent into the motor shaft 20a. Further, since the first through holes 26 a to 26 d are provided, the oil O that has flowed into the second oil passage 62 can be supplied to the stator 30 and the bearings 70 and 71. *
  • the second oil passage 62 provided in the motor shaft 20a opens to the first oil passage 61 connected to the discharge port 45 at the end portion on one axial side of the motor shaft 20a. . Since the external gear 42 is fixed to the end portion on the one axial side of the motor shaft 20a, the end portion on the one axial side of the motor shaft 20a is disposed at a position 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, the total length of the oil passage from the opening 12f to the second oil passage 62 can be easily shortened. Thereby, the structure of the drive device 1 can be easily simplified, and the drive device 1 can be easily manufactured. *
  • the radially inner side surface of the closing member 50 constitutes a part of the radially inner side surface of the second oil passage 62. Therefore, the oil O can be allowed to flow into the second oil passage 62 from the closing member 50 while fixing the external gear 42 to the closing member 50. Accordingly, as described above, the motor shaft main body 21 and the external gear 42 can be fixed via the closing member 50 without changing the dimensions of the motor shaft main body 21 and the external gear 42, and the second oil It is easy to open the path 62 to the first oil path 61.
  • the present invention is not limited to the above-described embodiment, and other configurations can be employed.
  • the closing member 50 may close the entire opening on the other axial side of the pump chamber 46.
  • the outer diameter of the closing lid 51 a is equal to or larger than the inner diameter of the pump chamber 46.
  • the external gear 42 may be directly fixed to the motor shaft main body 21 without using the closing member 50.
  • the second oil passage 62 may be provided only inside the motor shaft main body 21, for example.
  • the rotor core 22 may be fixed to the outer peripheral surface of the motor shaft 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 26a and 26b may be directly supplied to the coil 32, or a hole connected to the first through hole 26a is provided in the rotor core 22, and the hole of the rotor core 22 is provided. Oil O may be supplied to the coil 32 via Further, the oil O may be supplied to the stator core 31.
  • the location where the oil O discharged from the discharge port 45 is supplied is not particularly limited, and may be supplied to only one or two of the rotor 20, the stator 30, and the bearings 70 and 71, for example. However, it may not be supplied to either.
  • the oil O discharged from the discharge port 45 may be supplied to, for example, the inner side surface of the upper area in the vertical direction of the storage unit 14.
  • the stator 30 can be indirectly cooled by cooling the housing 10. Further, any one or more of the first through holes 26a to 26d may not be provided.
  • the tooth profile of the tooth portion 42a of the external gear 42 and the tooth profile of the tooth portion 43a of the internal gear 43 may be a cycloid tooth profile or an involute tooth profile. *

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

Selon un mode de réalisation d'un dispositif d'entraînement selon la présente invention, un logement comprend une partie de couvercle externe recouvrant un côté dans la direction axiale d'un arbre de moteur. Un groupe moto-pompe comprend : un engrenage à denture extérieure fixé à une partie d'extrémité d'un côté dans la direction axiale de l'arbre de moteur ; un engrenage à denture intérieure qui entoure le côté radialement extérieur de l'engrenage à denture extérieure et s'engrène avec l'engrenage à denture extérieure ; une chambre de pompage qui est en retrait d'un côté dans la direction axiale à partir d'un autre côté dans la direction axiale de la partie de couvercle externe, et qui loge l'engrenage à denture intérieure et l'engrenage à denture extérieure ; un orifice d'entrée d'aspiration capable d'aspirer l'huile dans la chambre de pompage ; et un orifice d'évacuation capable d'évacuer l'huile de l'intérieur de la chambre de pompage. L'arbre de moteur comprend un corps principal d'arbre de moteur auquel est fixé un noyau de rotor, et un élément de fermeture fixé au corps principal d'arbre de moteur. L'élément de fermeture chevauche l'engrenage à denture intérieure tel qu'il est vu dans la direction axiale, et ferme au moins une partie d'une ouverture sur ledit autre côté dans la direction axiale de la chambre de pompage.
PCT/JP2017/028552 2016-08-09 2017-08-07 Dispositif d'entraînement WO2018030325A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2018533024A JPWO2018030325A1 (ja) 2016-08-09 2017-08-07 駆動装置
US16/323,632 US10958137B2 (en) 2016-08-09 2017-08-07 Drive device
DE112017004013.2T DE112017004013B4 (de) 2016-08-09 2017-08-07 Antriebsvorrichtung
CN201780049084.XA CN109565223B (zh) 2016-08-09 2017-08-07 驱动装置

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US201662372411P 2016-08-09 2016-08-09
US62/372411 2016-08-09
US201662402027P 2016-09-30 2016-09-30
US62/402027 2016-09-30
US201662439201P 2016-12-27 2016-12-27
US62/439201 2016-12-27
JP2017-071396 2017-03-31
JP2017071396 2017-03-31

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WO2018030325A1 true WO2018030325A1 (fr) 2018-02-15

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN111756180A (zh) * 2019-03-28 2020-10-09 日本电产株式会社 马达
CN112020816A (zh) * 2018-04-25 2020-12-01 日本电产株式会社 马达单元
CN112534690A (zh) * 2018-08-07 2021-03-19 日本电产株式会社 马达
WO2023112536A1 (fr) * 2021-12-17 2023-06-22 ニデック株式会社 Moteur

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JP2008048494A (ja) * 2006-08-11 2008-02-28 Toyota Motor Corp モータ及びこれを用いたインホイールモータ構造
JP2013055728A (ja) * 2011-09-01 2013-03-21 Toyota Motor Corp 回転電機
JP2016101042A (ja) * 2014-11-25 2016-05-30 株式会社ニッキ ブラシレスモータ一体型ポンプ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008048494A (ja) * 2006-08-11 2008-02-28 Toyota Motor Corp モータ及びこれを用いたインホイールモータ構造
JP2013055728A (ja) * 2011-09-01 2013-03-21 Toyota Motor Corp 回転電機
JP2016101042A (ja) * 2014-11-25 2016-05-30 株式会社ニッキ ブラシレスモータ一体型ポンプ

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112020816A (zh) * 2018-04-25 2020-12-01 日本电产株式会社 马达单元
CN112534690A (zh) * 2018-08-07 2021-03-19 日本电产株式会社 马达
CN111756180A (zh) * 2019-03-28 2020-10-09 日本电产株式会社 马达
CN111756180B (zh) * 2019-03-28 2022-12-06 日本电产株式会社 马达
WO2023112536A1 (fr) * 2021-12-17 2023-06-22 ニデック株式会社 Moteur

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