WO2019065240A1 - Dispositif d'entraînement - Google Patents

Dispositif d'entraînement Download PDF

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Publication number
WO2019065240A1
WO2019065240A1 PCT/JP2018/033792 JP2018033792W WO2019065240A1 WO 2019065240 A1 WO2019065240 A1 WO 2019065240A1 JP 2018033792 W JP2018033792 W JP 2018033792W WO 2019065240 A1 WO2019065240 A1 WO 2019065240A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
motor shaft
clutch
external gear
rotation
Prior art date
Application number
PCT/JP2018/033792
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 CN201890001111.6U priority Critical patent/CN212392766U/zh
Publication of WO2019065240A1 publication Critical patent/WO2019065240A1/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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/108—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction clutches
    • 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.
  • 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. Therefore, when the rotational speed of the rotating electrical machine changes, the pump unit may not be driven stably.
  • the amount of oil supplied by the pump unit decreases.
  • the pump unit can not be driven and oil can not be supplied by the pump unit. As described above, depending on the rotation state of the rotating electrical machine, the supply of oil by the pump unit may be insufficient.
  • the present invention has an object to provide a drive device that includes a pump unit driven via a motor shaft and can stably drive the pump unit regardless of the rotational state of the motor shaft. Do.
  • 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 And a pump unit driven by the motor shaft to deliver the oil stored in the storage unit to at least one of the rotor and the stator; It has a first clutch that switches connection and disconnection between a motor shaft and the pump unit, and a pump drive unit having a pump drive shaft and capable of driving the pump unit via the pump drive shaft.
  • a drive device includes a pump unit driven via a motor shaft, and can stably drive the pump unit regardless of the rotational state of the motor shaft.
  • FIG. 1 is a view schematically showing a schematic configuration of the drive device of the first embodiment.
  • FIG. 2 is a view schematically showing a schematic configuration of a drive device according to a second 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 the present embodiment includes a housing 20 and a rotor 20 having a motor shaft 21 disposed along a central axis J1 extending in one direction, and a stator 30. , A pump unit 40, a pump drive unit 50, a first clutch 71, and a second clutch 72.
  • 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 referred to as “first circumferential direction ⁇ 1”.
  • 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 direction advancing clockwise is the positive direction of the first circumferential direction ⁇ 1
  • the direction advancing counterclockwise is The negative direction of one circumferential direction ⁇ 1 is taken.
  • the positive direction of the first circumferential direction ⁇ 1 corresponds to one direction around the central axis extending in one direction.
  • the negative direction of the first circumferential direction ⁇ 1 corresponds to the other direction around the central axis extending in one direction.
  • the housing 10 has a housing 11.
  • the housing portion 11 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 11.
  • 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 housing 10 has an opening 12 which opens in a vertically lower area in the housing 11.
  • the liquid surface OS of the oil O stored in the storage unit 11 in the present embodiment is located above the opening 12.
  • the opening 12 opens into the oil O stored in the storage unit 11.
  • the fluid level OS of the oil O fluctuates as the pump portion 40 sucks up the oil O, but is disposed below the rotor 20 at least when the rotor 20 rotates. Thereby, when the rotor 20 rotates, it can suppress that oil O becomes rotation resistance of the rotor 20. As shown in FIG.
  • the housing 10 has a first oil passage 61 and an intake oil passage 63.
  • One end of the first oil passage 61 is connected to a discharge port 45 of a pump chamber 43 described later.
  • the other end of the first oil passage 61 is connected to a second oil passage 62 described later. That is, the first oil passage 61 connects the discharge port 45 and the second oil passage 62.
  • One end of the suction oil passage 63 is connected to the vertically lower region in the housing 11 through the opening 12.
  • the other end of the suction oil passage 63 is connected to the suction port 44 of the pump chamber 43. That is, the suction oil passage 63 connects the lower region in the vertical direction in the housing portion 11 and the suction port 44.
  • the rotor 20 has a motor shaft 21, an annular rotor core 22 fixed to the outer peripheral surface of the motor shaft 21, and a magnet (not shown) fixed to the rotor core 22.
  • the motor shaft 21 has a second oil passage 62 provided inside the motor shaft 21.
  • the second oil passage 62 is a bottomed hole extending from the end of the motor shaft 21 on one side in the axial direction to the other side in the axial direction.
  • the second oil passage 62 opens in one axial direction.
  • the cross-sectional shape orthogonal to the axial direction in the second oil passage 62 is, for example, a circular shape centered on the central axis J1.
  • the second oil passage 62 is connected to the first oil passage 61. In FIG. 1, 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 21.
  • the motor shaft 21 has through holes 21 a and 21 b connecting the second oil passage 62 and the outer peripheral surface of the motor shaft 21.
  • the through holes 21a and 21b extend in the radial direction.
  • the through hole 21 a is disposed on one side in the axial direction of the rotor core 22.
  • the through hole 21 b is disposed on the other side in the axial direction with respect to the rotor core 22.
  • the through holes 21 a and 21 b are connected to the inside of the housing portion 11. For example, a plurality of through holes 21a and 21b are provided along the circumferential direction.
  • 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 stator core 31 faces the radially outer side of the rotor core 22 via a gap.
  • the pump portion 40 is disposed on one side in the axial direction of the motor shaft 21.
  • the pump unit 40 has a first external gear 41, a second external gear 42, a pump chamber 43, an inlet 44, and an outlet 45.
  • the first external gear 41 has a plurality of teeth on the outer peripheral surface.
  • the tooth shape of the tooth portion of the first external gear 41 is, for example, a trochoidal tooth shape.
  • the first external gear 41 is rotatably disposed around the central axis J1.
  • the first external gear 41 is attached to the motor shaft 21 via the first clutch 71.
  • the rotation of the motor shaft 21 is transmitted to the first external gear 41 via the first clutch 71.
  • the first external gear 41 corresponds to a first rotating portion.
  • the second external gear 42 has a plurality of teeth on the outer peripheral surface.
  • the tooth shape of the tooth portion of the second external gear 42 is, for example, a trochoidal tooth shape.
  • the second external gear 42 meshes with the first external gear 41.
  • the second external gear 42 is rotatably disposed around the rotation axis J2.
  • the rotation axis J2 is parallel to the central axis J1, and is located, for example, below the central axis J1.
  • the axial position of the second external gear 42 is the same as the axial position of the first external gear 41.
  • the second external gear 42 is attached to the pump drive shaft 51 of the pump drive unit 50 via the second clutch 72.
  • the rotation of the pump drive unit 50 is transmitted to the second external gear 42 through the second clutch 72.
  • the rotational direction of the second external gear 42 is opposite to the rotational direction of the first external gear 41.
  • the second external gear 42 corresponds to a second rotating portion.
  • the circumferential direction around the rotation axis J2 is referred to as "second circumferential direction ⁇ 2".
  • the direction advancing counterclockwise is the positive direction of the second circumferential direction ⁇ 2
  • the direction advancing clockwise is the second circumference
  • the negative direction of the direction ⁇ 2 is taken.
  • the positive direction of the second circumferential direction ⁇ 2 about the rotation axis J2 is opposite to the positive direction of the first circumferential direction ⁇ 1 about the central axis J1.
  • the positive direction of the second circumferential direction ⁇ 2 corresponds to one direction around the rotation axis of the pump drive shaft.
  • the negative direction of the second circumferential direction ⁇ 2 corresponds to the other direction around the rotation axis of the pump drive shaft.
  • the pump chamber 43 is provided in the housing 10.
  • the pump chamber 43 accommodates the first external gear 41 and the second external gear 42.
  • the suction port 44 is connected to the suction oil passage 63.
  • the suction port 44 is disposed between the first external gear 41 and the second external gear 42 in the vertical direction Z.
  • the suction port 44 opens to one side of the pump chamber 43 in the depth direction orthogonal to both the axial direction and the vertical direction Z, for example.
  • the suction port 44 can suck the oil O stored in the storage unit 11 into the pump chamber 43 via the suction oil passage 63.
  • the discharge port 45 is connected to the first oil passage 61.
  • the discharge port 45 is disposed between the first external gear 41 and the second external gear 42 in the vertical direction Z.
  • the discharge port 45 opens to the other side of the pump chamber 43 in the depth direction orthogonal to both the axial direction and the vertical direction Z, for example. That is, the suction port 44 and the discharge port 45 are disposed on opposite sides of the pump chamber 43 in the depth direction.
  • the discharge port 45 can discharge the oil O from the inside of the pump chamber 43 to the first oil passage 61.
  • the pump unit 40 feeds the oil O by the rotation of the first external gear 41 and the second external gear 42 engaged with each other.
  • the pump drive unit 50 is disposed on one side in the axial direction of the pump unit 40.
  • the pump drive unit 50 is attached to the housing 10.
  • the pump drive unit 50 is a motor having a pump drive shaft 51.
  • the pump drive shaft 51 is, for example, disposed along the rotation axis J2 and extends in the axial direction.
  • the pump drive unit 50 can drive the pump unit 40 via the pump drive shaft 51.
  • the first clutch 71 switches connection and disconnection between the motor shaft 21 and the pump unit 40. More specifically, the first clutch 71 switches between connection and disconnection of the motor shaft 21 and the first external gear 41.
  • the first clutch 71 is a one-way clutch.
  • the first clutch 71 connects the motor shaft 21 and the first external gear 41 when the motor shaft 21 tries to rotate relative to the first external gear 41 in the positive direction of the first circumferential direction ⁇ 1. Do.
  • the rotation of the motor shaft 21 is transmitted to the first external gear 41, and the first external gear 41 rotates with the motor shaft 21 in the positive direction of the first circumferential direction ⁇ 1.
  • the first clutch 71 and the first external gear 41 Disconnect from Thus, the rotation of the motor shaft 21 is not transmitted to the first external gear 41, and the motor shaft 21 rotates relative to the first external gear 41 in the negative direction of the first circumferential direction ⁇ 1. That is, the motor shaft 21 and the first external gear 41 idle on each other.
  • the first clutch 71 prevents relative rotation in the positive direction and causes relative rotation in the negative direction. Tolerate.
  • the first clutch 71 has an inner ring and an outer ring surrounding the inner ring.
  • the inner ring of the first clutch 71 is fitted and fixed to an end of the motor shaft 21 on one side in the axial direction.
  • the first external gear 41 is fitted and fixed to the outer peripheral surface of the outer ring of the first clutch 71.
  • the inner ring of the first clutch 71 and the outer ring of the first clutch 71 are connected to each other when the inner ring tries to rotate relative to the outer ring in the positive direction of the first circumferential direction ⁇ 1.
  • the connection between the inner ring of the first clutch 71 and the outer ring of the first clutch 71 is disconnected when the inner ring tries to rotate relative to the outer ring in the negative direction of the first circumferential direction ⁇ 1.
  • the inner ring of the first clutch 71 rotates with the motor shaft 21. Therefore, as the inner ring and the outer ring in the first clutch 71 are connected and disconnected in this manner, the rotation transmission to the first external gear 41 according to the rotation direction of the motor shaft 21 as described above. The presence or absence of is switched.
  • the second clutch 72 switches between connection and disconnection of the pump drive shaft 51 and the pump unit 40. More specifically, the second clutch 72 switches between connection and disconnection of the pump drive shaft 51 and the second external gear 42.
  • the second clutch 72 is a one-way clutch.
  • the second clutch 72 is configured to move the pump drive shaft 51 and the second external gear 42 together. Connect
  • the rotation of the pump drive shaft 51 is transmitted to the second external gear 42, and the second external gear 42 rotates with the pump drive shaft 51 in the positive direction of the second circumferential direction ⁇ 2.
  • the pump drive shaft 51 when the pump drive shaft 51 is to rotate relative to the second external gear 42 in the negative direction of the second circumferential direction ⁇ 2 with respect to the second clutch 72, the pump drive shaft 51 and the second external gear Disconnect the connection with 42.
  • the rotation of the pump drive shaft 51 is not transmitted to the second external gear 42, and the pump drive shaft 51 rotates relative to the second external gear 42 in the negative direction of the second circumferential direction ⁇ 2. That is, the pump drive shaft 51 and the second external gear 42 idle on each other.
  • the second clutch 72 prevents the relative rotation in the positive direction, and the relative rotation in the negative direction. Allow
  • the second clutch 72 has an inner ring and an outer ring surrounding the inner ring, like the first clutch 71.
  • the inner ring of the second clutch 72 is fitted and fixed to the other end of the pump drive shaft 51 in the axial direction.
  • the second external gear 42 is fitted and fixed to the outer peripheral surface of the outer ring of the second clutch 72.
  • the inner ring of the second clutch 72 and the outer ring of the second clutch 72 are connected to each other when the inner ring is to rotate relative to the outer ring in the positive direction of the second circumferential direction ⁇ 2.
  • connection between the inner ring of the second clutch 72 and the outer ring of the second clutch 72 is disconnected when the inner ring is to rotate relative to the outer ring in the negative direction of the second circumferential direction ⁇ 2.
  • the inner ring of the second clutch 72 rotates with the pump drive shaft 51. Therefore, as the inner ring and the outer ring in the second clutch 72 are connected and disconnected in this manner, rotation to the second external gear 42 according to the rotation direction of the pump drive shaft 51 as described above. The presence or absence of transmission can be switched.
  • the first clutch 71 and the second clutch 72 are not particularly limited as long as they are one-way clutches that allow transmission of rotation in one direction as described above and block transmission of rotation in the other direction.
  • the first clutch 71 and the second clutch 72 may be, for example, a sprag type one way clutch or a cam type one way clutch.
  • the oil O that has flowed out of the through holes 21 a and 21 b is sprayed to the coil 32. Thereby, 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 21, the rotor 20 can also be cooled by the oil O until it flows out from the through holes 21a and 21b. Thus, the oil O discharged from the discharge port 45 in the present embodiment is led to the rotor 20 and the stator 30.
  • the circumferential position of the through holes 21 a and 21 b changes as the rotor 20 rotates.
  • the direction of the oil O flowing out of the through holes 21a and 21b changes in the first circumferential direction ⁇ 1, and the plurality of coils 32 disposed along the first circumferential direction ⁇ 1 can be cooled by the oil O. .
  • the pump unit 40 can be driven by the rotation of the motor shaft 21, and the oil O stored in the housing 10 can be sucked up by the pump unit 40 and supplied to the rotor 20 and the stator 30. That is, the pump unit 40 sends the oil O stored in the storage unit 11 to both the rotor 20 and the stator 30. Thereby, the rotor 20 and the stator 30 can be cooled by utilizing the oil O stored in the housing 10.
  • the oil O supplied to the stator 30 falls in the housing portion 11 and is stored again in the vertically lower region in the housing portion 11. Thereby, the oil O in the accommodating part 11 can be circulated.
  • the pump drive shaft 51 rotates in the positive direction of the second circumferential direction ⁇ 2
  • the rotation of the pump drive shaft 51 is transmitted to the second external gear 42 via the second clutch 72
  • the second external gear 42 Rotates in the positive direction of the second circumferential direction ⁇ 2.
  • the first external gear 41 engaged with the second external gear 42 rotates in the positive direction of the first circumferential direction ⁇ 1, and is drawn into the pump chamber 43 from the suction oil passage 63 via the suction port 44.
  • Oil O is sent to the discharge port 45 via the space between the first external gear 41 and the second external gear 42.
  • the pump unit 40 is driven via the pump drive shaft 51.
  • the oil O sent to the discharge port 45 is supplied to the rotor 20 and the stator 30 in the same manner as when the pump unit 40 is driven by the motor shaft 21.
  • the pump drive unit 50 can drive the pump unit 40.
  • the pump drive unit 50 can drive the pump unit 40 as described above. Therefore, even when the rotational speed of the motor shaft 21 is relatively low, the pump 40 can be driven at a required rotational speed by driving the pump 40 by the pump drive unit 50. Thus, even when the rotational speed of the motor shaft 21 is relatively low, the amount of oil O supplied by the pump unit 40 can be maintained.
  • the first clutch 71 that switches between connection and disconnection of the motor shaft 21 and the pump unit 40 is provided. Therefore, when driving the pump unit 40 by the pump drive unit 50, the motor shaft 21 and the pump unit 40 are disconnected to rotate the pump unit 40, that is, the rotation of the first external gear 41 as the motor shaft 21. Can be blocked from being transmitted to Therefore, it is easy to maintain the rotation of the motor shaft 21 at a desired rotational speed.
  • the drive device 1 includes the pump unit 40 driven via the motor shaft 21 and can stably drive the pump unit 40 regardless of the rotational state of the motor shaft 21. can get. Therefore, the amount of oil O supplied can be maintained regardless of the rotational state of the motor shaft 21.
  • the first clutch 71 is in the disconnected state, a load for rotating the pump unit 40 is not applied to the motor shaft 21 when the pump drive unit 50 drives the pump unit 40. Therefore, the load for rotating the motor shaft 21 can be reduced.
  • the first clutch 71 is a one-way clutch. Therefore, the state of the first clutch 71 can be automatically switched between connection and disconnection according to the direction in which the motor shaft 21 rotates with respect to the pump unit 40, which is simple.
  • the first clutch 71 prevents relative rotation in the positive direction and relative rotation in the negative direction. Tolerate. Therefore, when the motor shaft 21 is to rotate relative to the first external gear 41 in the positive direction of the first circumferential direction ⁇ 1, the first external gear 41 can be rotated by the motor shaft 21.
  • the rotational speed of the motor shaft 21 is relatively low, for example, the rotational speed of the first external gear 41 rotated by the pump drive unit 50 is larger than the rotational speed of the motor shaft 21. Therefore, the motor shaft 21 rotates in the negative direction of the first circumferential direction ⁇ 1 relatively to the first external gear 41. As a result, the connection between the motor shaft 21 and the first external gear 41 is disconnected, and relative rotation of the motor shaft 21 with respect to the first external gear 41 is permitted. Therefore, it is possible to prevent the rotation of the motor shaft 21 from being impeded by the first external gear 41 rotated by the pump drive unit 50.
  • the second clutch 72 that switches between connection and disconnection of the pump drive shaft 51 and the pump unit 40 is provided. Therefore, by disconnecting the connection between the pump drive shaft 51 and the pump unit 40 when the pump unit 40 is driven by the motor shaft 21, transmission of the rotation of the pump unit 40 to the pump drive shaft 51 can be prevented. . Therefore, a load for rotating the pump drive shaft 51 is not applied to the motor shaft 21, and an increase in load when the pump portion 40 is driven by the motor shaft 21 can be suppressed. Moreover, it can suppress that an excess back electromotive force arises in the pump drive part 50. FIG.
  • the second clutch 72 is a one-way clutch. Therefore, the state of the second clutch 72 can be automatically switched between connection and disconnection according to the direction in which the pump drive shaft 51 rotates with respect to the pump unit 40, which is simple.
  • the second clutch 72 prevents relative rotation in the positive direction, and relative rotation in the negative direction. Allow Therefore, when the pump drive shaft 51 is to rotate relative to the second external gear 42 in the positive direction of the second circumferential direction ⁇ 2, the pump drive shaft 51 may rotate the second external gear 42. it can.
  • the pump drive shaft 51 rotates in the negative direction of the second circumferential direction ⁇ 2 relatively to the second external gear 42.
  • the connection between the pump drive shaft 51 and the second external gear 42 is disconnected, and relative rotation of the pump drive shaft 51 with respect to the second external gear 42 is permitted. Therefore, even if the pump unit 40 is driven by the motor shaft 21, the pump drive shaft 51 can be prevented from rotating.
  • the pump unit 40 has the first external gear 41 and the second external gear 42.
  • the rotation of the motor shaft 21 is transmitted to the first external gear 41, and the rotation of the pump drive shaft 51 is transmitted to the second external gear 42. That is, the motor shaft 21 and the pump drive shaft 51 are connected to different external gears and connected to the pump unit 40. Therefore, as compared with the case where the motor shaft 21 and the pump drive shaft 51 are connected to the same external gear, the arrangement freedom of the pump drive unit 50 can be improved.
  • the arrangement freedom of the pump drive part 50 can be improved, the arrangement freedom of the first oil passage 61 and the suction oil passage 63 provided in the housing 10 can also be improved.
  • the oil O discharged from the discharge port 45 can be sent to the inside of the motor shaft 21 by providing the first oil passage 61 and the second oil passage 62. Further, since the through holes 21a and 21b are provided, the oil O flowing into the second oil passage 62 can be supplied to the stator 30 through the through holes 21a and 21b.
  • the oil O is preferably coiled if the supply amount of the oil O from the pump unit 40 is not large. Hard to spray on 32
  • the pump unit 40 can be stably driven, and the supply amount of the oil O can be maintained.
  • 21b, oil O can be suitably sprayed onto the coil 32.
  • the pump unit 140 has a third external gear 141 and an internal gear 142.
  • the third external gear 141 has a plurality of teeth on the outer peripheral surface.
  • the tooth shape of the tooth portion of the third external gear 141 is, for example, a trochoidal tooth shape.
  • the third external gear 141 is disposed rotatably around the central axis J1. The rotation of the motor shaft 21 is transmitted to the third external gear 141 via the first clutch 171.
  • the third external gear 141 corresponds to a first rotating portion and a second rotating portion.
  • the internal gear 142 is an annular gear rotatable around an axis eccentric to the central axis J1.
  • the internal gear 142 surrounds the radially outer side of the third external gear 141 and meshes with the third external gear 141.
  • the internal gear 142 has a plurality of teeth on its inner circumferential surface.
  • the tooth profile of the teeth of the internal gear 142 is a trochoid tooth profile.
  • the pump chamber 143 accommodates the third external gear 141 and the internal gear 142.
  • the suction port 144 opens to the other axial side of the pump chamber 143.
  • the discharge port 145 opens on one side in the axial direction of the pump chamber 143.
  • the suction port 144 and the discharge port 145 are respectively connected to the gap between the third external gear 141 and the internal gear 142.
  • the rotation of the pump drive shaft 151 of the pump drive unit 150 is transmitted to the third external gear 141 via the second clutch 172. That is, in the present embodiment, the rotation of the motor shaft 21 and the rotation of the pump drive shaft 151 are transmitted to the same external gear.
  • the pump drive shaft 151 is disposed, for example, along the central axis J1 on one side in the axial direction of the pump portion 140. That is, in the present embodiment, the rotation axis of the pump drive shaft 151 is the central axis J1.
  • the first clutch 171 switches between connection and disconnection of the motor shaft 21 and the third external gear 141.
  • the first clutch 171 is a centrifugal clutch.
  • the first clutch 171 connects the motor shaft 21 and the third external gear 141 when the rotational speed of the motor shaft 21 is equal to or higher than a predetermined speed.
  • the first clutch 171 disconnects the connection between the motor shaft 21 and the third external gear 141 when the rotational speed of the motor shaft 21 is smaller than a predetermined speed.
  • the second clutch 172 switches connection and disconnection between the pump drive shaft 151 of the pump drive unit 150 and the third external gear 141.
  • the second clutch 172 is a one-way clutch as in the first embodiment.
  • the second clutch 172 is configured to move the pump drive shaft 151 and the third external gear 141 together.
  • the pump drive shaft 151 tries to rotate relative to the third external gear 141 in the negative direction of the first circumferential direction ⁇ 1 with respect to the third clutch 172
  • the pump drive shaft 151 and the third external gear Disconnect the connection with 141. That is, of the relative rotation around the rotation axis of the pump drive shaft 151 with respect to the third external gear 141, the second clutch 172 prevents relative rotation in one direction and allows relative rotation in the other direction.
  • one direction around the rotation axis of the pump drive shaft 151 is a positive direction in the first circumferential direction ⁇ 1.
  • the other direction around the rotation axis of the pump drive shaft 151 is the negative direction of the first circumferential direction ⁇ 1.
  • the first clutch 171 is provided, and since the pump drive unit 150 can drive the pump unit 140, the pump unit is not dependent on the rotational state of the motor shaft 21.
  • a driving device 2 capable of stably driving 140 is obtained.
  • the first clutch 171 is a centrifugal clutch. Therefore, according to the rotational speed of the motor shaft 21, the state of the first clutch 171 can be automatically switched between connection and disconnection, which is simple.
  • the first clutch 171 connects the motor shaft 21 and the pump portion 140 when the rotational speed of the motor shaft 21 is equal to or higher than a predetermined speed, and the rotational speed of the motor shaft 21 is smaller than the predetermined speed. , And disconnect the connection between the motor shaft 21 and the pump unit 140. Therefore, when the rotational speed of the motor shaft 21 is relatively low, the first clutch 171 is in a disconnected state. Thus, by driving the pump unit 140 by the pump drive unit 150 in this state, the pump unit 140 is maintained while maintaining the supply amount of oil O even when the rotational speed of the motor shaft 21 is relatively low. Rotation of the motor shaft 21 can be prevented from being hindered.
  • the motor shaft 21 rotates in the negative direction of the first circumferential direction ⁇ 1
  • the first clutch 171 is in the disconnected state. Therefore, by driving the pump unit 140 by the pump drive unit 150 in this state, even if the motor shaft 21 is reversely rotated, the motor shaft is maintained by the rotation of the pump unit 140 while maintaining the supply amount of the oil O. It is possible to prevent the rotation of 21 from being inhibited.
  • the reverse rotation of the motor shaft 21 refers to the case where the vehicle reverses.
  • the rotational speed of the motor shaft 21 is relatively low. Therefore, even if the first clutch 171 is a centrifugal clutch, the switching of the first clutch 171 can be suitably performed according to the rotation state of the motor shaft 21.
  • the pump portion 140 has the third external gear 141 and the internal gear 142 surrounding the radially outer side of the third external gear 141. Therefore, the entire pump portion 140 can be easily miniaturized as compared with a configuration in which two external gears are engaged. Therefore, the drive device 2 can be easily miniaturized.
  • the present invention is not limited to the above-described embodiment, and other configurations can be adopted.
  • the first clutch is not particularly limited as long as connection and disconnection of the motor shaft and the pump unit can be switched.
  • the second clutch is not particularly limited as long as connection and disconnection between the pump drive shaft and the pump portion can be switched.
  • the first clutch and the second clutch may be, for example, an electromagnetic clutch. Also, the second clutch may not be provided.
  • the first clutch When the first clutch is a centrifugal clutch as in the second embodiment, the first clutch connects the motor shaft and the pump portion when the rotational speed of the motor shaft is smaller than a predetermined speed, and the motor The motor shaft and the pump unit may be disconnected when the rotational speed of the shaft is equal to or higher than a predetermined speed.
  • the connection between the motor shaft and the pump unit can be disconnected, and the pump unit can be suppressed from being driven at high speed.
  • cavitation is likely to occur when the volume of the pump portion is relatively large.
  • cavitation can be suppressed, and the capacity of the pump unit can be easily increased.
  • the pump unit may send the oil O stored in the storage unit to at least one of the rotor and the stator. That is, the pump unit may be configured to feed the oil O to only one of the rotor and the stator.
  • the configuration of the pump unit is not particularly limited as long as the oil O stored in the storage unit can be supplied to at least one of the rotor and the stator.
  • the tooth profile of the teeth of each external gear and the tooth profile of the teeth of the internal gear may be cycloid or involute.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

Un mode de réalisation de la présente invention concerne un dispositif d'entraînement comprenant : un rotor ayant un arbre de moteur disposé le long d'un axe central s'étendant dans une direction ; un stator faisant face radialement au rotor avec un espace entre eux ; un boîtier ayant une section de maintien destinée à maintenir le rotor et le stator et capable de contenir de l'huile ; une section de pompe entraînée par l'arbre de moteur et délivrant l'huile contenue dans la section de maintien à au moins l'un parmi le rotor et le stator ; un premier embrayage permettant de connecter ou déconnecter l'arbre de moteur et la section de pompe ; et une section d'entraînement de pompe ayant un arbre d'entraînement de pompe et pouvant entraîner la section de pompe par le biais de l'arbre d'entraînement de pompe.
PCT/JP2018/033792 2017-09-27 2018-09-12 Dispositif d'entraînement WO2019065240A1 (fr)

Priority Applications (1)

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JP2017-186494 2017-09-27

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008174069A (ja) * 2007-01-18 2008-07-31 Mazda Motor Corp ホイール駆動装置
JP2016065616A (ja) * 2014-09-25 2016-04-28 Ntn株式会社 インホイールモータ駆動装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008174069A (ja) * 2007-01-18 2008-07-31 Mazda Motor Corp ホイール駆動装置
JP2016065616A (ja) * 2014-09-25 2016-04-28 Ntn株式会社 インホイールモータ駆動装置

Also Published As

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