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CN-115549343-B - Motor and driving device

CN115549343BCN 115549343 BCN115549343 BCN 115549343BCN-115549343-B

Abstract

The motor shaft has a first shaft and a second shaft extending axially from the first shaft to one side. The housing has a neutralization device holder that holds a first neutralization device. The static eliminator holder has a seal holder which is disposed radially outward of the second shaft and holds a seal member. The first neutralization device electrically connects the second shaft with the neutralization device holder. The seal member seals between the second shaft and the seal holder, and is disposed on the other side in the axial direction of the first power removing device.

Inventors

  • Makino Takano
  • AONO MASAYUKI

Assignees

  • 日本电产株式会社

Dates

Publication Date
20260508
Application Date
20220627
Priority Date
20210630

Claims (18)

  1. 1. A motor, comprising: a shaft having a first shaft extending in an axial direction along the rotation axis; a rotor fixed to the shaft and rotatable about the rotation axis; a stator that is disposed to face the rotor with a gap therebetween in a radial direction; a bearing rotatably supporting the shaft; a housing accommodating the rotor, the stator, and the bearing; a first electricity removing device, and The sealing member is provided with a sealing surface, The shaft further has a second shaft extending axially from the first shaft to one of the axial directions, The housing has: a bearing holder having an opening through which the first shaft is inserted and holding the bearing, and A neutralization device holder that holds the first neutralization device and covers at least a portion of the opening, The static eliminator holder has a seal holder which is disposed radially outward of the second shaft and holds the seal member, The first electricity removing device electrically connects the second shaft with the electricity removing device holder, The sealing member seals between the second shaft and the seal holder, is disposed on the other side in the axial direction of the first power removing device, The first shaft has: a cylindrical shaft portion extending in the axial direction and surrounding the rotation axis, and A shaft cover part arranged on one side of the shaft cylinder part in the axial direction, The shaft further has: A first shaft penetration hole penetrating the first shaft in a radial direction, and A second shaft through hole communicating a space surrounded by the shaft tube portion and the shaft cover portion with the outside of the shaft, The second shaft through hole is axially opposite to the sealing member, Fluid can flow through the shaft tube portion and the second shaft through hole.
  2. 2. The motor according to claim 1, wherein, The first neutralization device is disposed at one axial side of the neutralization device holder and at one axial position between the second shaft and the seal holder than the seal member.
  3. 3. A motor according to claim 1 or 2, wherein, The outer diameter of the second shaft is smaller than the outer diameter of the first shaft, The first electricity removing device is in contact with at least a part of a region in a circumferential direction of a radially outer side surface of the second shaft.
  4. 4. A motor according to claim 1 or 2, wherein, The static eliminator holder further has a plate portion that expands in a direction intersecting the rotation axis, The seal holder further has: A first protruding portion protruding from the other axial end portion of the plate portion toward the other axial end portion, and A second protruding portion protruding from the other axial end portion of the first protruding portion toward the other axial end portion, The second protruding portion is disposed radially inward of the axial one end portion of the first shaft, An axial one end portion of the first shaft is axially opposed to the first protruding portion and radially opposed to the second protruding portion.
  5. 5. A motor according to claim 1 or 2, wherein, The seal holder is housed at the other axial end portion thereof inside the first shaft.
  6. 6. A motor according to claim 1 or 2, wherein, The second shaft through hole is disposed at a position axially on one side of the first shaft through hole and radially outside of the second shaft.
  7. 7. A motor according to claim 1 or 2, wherein, The second shaft extends from the shaft cover portion in one axial direction, At least a part of the second shaft through hole penetrates the shaft cover portion.
  8. 8. The motor of claim 7, wherein the motor is configured to control the motor, The first shaft further has a peripheral wall portion protruding in one axial direction from one axial end portion of the shaft tube portion, The peripheral wall portion is disposed radially outward of the seal holder, The seal holder is radially opposed to the peripheral wall portion and axially opposed to an axial one end portion of the shaft tube portion.
  9. 9. A motor according to claim 1 or 2, wherein, The first shaft further has a step into which the shaft cover portion is fitted, The step includes: a first opposing surface axially opposing the axial other end portion of the shaft cover portion, and And a second facing surface that extends in one axial direction from a radially outer end of the first facing surface and faces a radially outer end of the shaft cover.
  10. 10. A motor according to claim 1 or 2, wherein, Also included is a rotation detector that detects the rotation angle of the shaft, The rotation detector is disposed in a space surrounded by the bearing holder and the static eliminator holder.
  11. 11. A motor according to claim 1 or 2, wherein, A second electrical removal device electrically connects the first shaft with the housing is also included.
  12. 12. The motor of claim 11, wherein the motor is configured to control the motor, The second neutralization device is disposed at a position axially opposite to the axial one end of the first shaft.
  13. 13. A motor according to claim 1 or 2, wherein, The first neutralization device is arranged on one side of the neutralization device holder in the axial direction, The static eliminator holder further has a holder recess recessed toward the other axial direction, At least a portion of the first charge removing device is received in the holder recess.
  14. 14. The motor of claim 13, wherein the motor is configured to control the motor, The radially outer end of the first electricity removal device is in contact with the radially inward facing inner surface of the holder recess.
  15. 15. A motor according to claim 1 or 2, wherein, The case further includes a cover member disposed at one axial end of the neutralization device holder and covering the first neutralization device and the opening, At least one of the static eliminator holder and the cover member is provided with a through hole.
  16. 16. The motor of claim 15, wherein the motor is configured to control the motor, The housing further has a filter covering the through hole, The space between the electricity removing device holder and the cover member is connected to the outside via the through-hole and the filter, The cover member has: A plate portion extending in a direction intersecting the rotation axis, and A cover concave part recessed from the plate part to the other axial direction, At least one of the through holes is arranged in the cover recess, The filter covering the through hole of the cover concave portion is disposed at the other axial direction from the plate portion.
  17. 17. The motor of claim 16, wherein the motor is configured to control the motor, The first neutralization device is arranged on one side of the neutralization device holder in the axial direction, At least a portion of the filter overlaps the first charge removing device as viewed radially.
  18. 18. A driving device, characterized by comprising: the motor according to any one of claims 1 to 17, and And a power transmission device for transmitting the power of the motor to the drive shaft.

Description

Motor and driving device Technical Field The present invention relates to a motor and a driving device. Background Conventionally, a power removing device for removing power from a shaft of a motor of a driving device is known. For example, a charge diffusion assembly as a charge removing device is disposed between a shaft and a housing of a motor, and contacts a radially outer surface of the shaft to electrically ground the shaft (for example, refer to japanese patent application laid-open No. 2005-124391). [ Prior Art literature ] [ Patent literature ] [ Patent document 1] Japanese patent application laid-open No. 2005-124391 Disclosure of Invention However, when foreign matter adheres to the static eliminator, the static eliminator sometimes reduces the static eliminating efficiency of the shaft. For example, in a vehicle-mounted driving device, lubricating oil, a refrigerant for cooling a motor, or the like may adhere to a static eliminator. At this time, it may be difficult to maintain good electrical conduction between the shaft and the housing due to the reduced conductivity of the neutralization apparatus. The object of the invention is to maintain a good electrical connection between the shaft and the housing. An exemplary motor of the present invention includes a shaft, a rotor, a stator, a bearing, a housing, a first de-energizing device, and a sealing member. The shaft has a first shaft extending in an axial direction along an axis of rotation. The rotor is fixed to the shaft and rotatable about the rotation axis. The stator is opposed to the rotor with a gap therebetween in the radial direction. The bearing rotatably supports the shaft. The housing houses the rotor, the stator, and the bearing. The shaft also has a second shaft. The second shaft extends from the first shaft to one of the axial directions. The housing has a bearing retainer and a static eliminator retainer. The bearing holder has an opening through which the first shaft is inserted, and holds the bearing. The neutralization device holder holds the first neutralization device and covers at least a portion of the opening. The static eliminator holder has a seal holder. The seal holder is disposed radially outward of the second shaft and holds the seal member. The first neutralization device electrically connects the second shaft with the neutralization device holder. The seal member seals between the second shaft and the seal holder, and is disposed on the other side in the axial direction of the first power removing device. An exemplary drive device of the present invention includes the motor and the power transmission device described above. The power transmission device transmits power of the motor to a drive shaft. According to the exemplary motor and the driving device of the present invention, the electrical connection between the shaft and the housing can be well maintained. Drawings Fig. 1 is a conceptual diagram illustrating a configuration example of a driving device. Fig. 2 is a conceptual diagram showing an enlarged configuration example of a main portion of the driving device according to the embodiment. Fig. 3 is a schematic diagram showing an example of a vehicle equipped with a driving device. Fig. 4 is a schematic diagram showing another configuration example of the first shaft. Fig. 5A is a diagram showing an example of contact between the second shaft and the first power removing device. Fig. 5B is a view showing another example of contact of the second shaft and the first neutralization device. Fig. 6A shows a first example of arrangement of the second shaft penetration hole in the shaft cover portion. Fig. 6B shows a second configuration example of the second shaft penetration hole in the shaft cover portion. Fig. 6C shows a third configuration example of the second shaft penetration hole in the shaft cover portion. Fig. 7 is a schematic diagram showing another configuration example of the first power removing device. Fig. 8 is a schematic view showing another configuration example of the seal holder. Fig. 9 is a conceptual diagram showing an enlarged configuration example of a main portion of the driving device according to the first modification. Fig. 10 is a conceptual diagram showing an enlarged configuration example of a main portion of the driving device according to the second modification. Fig. 11 is a conceptual diagram showing an enlarged configuration example of a main portion of the driving device according to the third modification. (Symbol description) 100..Driving device, 200..battery, 300..vehicle: a motor, 11, a rotor, 111, a rotor core a motor, a rotor rotor core 1221. coil end, 2. shaft, 201. first shaft through hole second shaft through hole, 21. 211..a shaft tube portion, 212..a hollow portion, 213..a flow inlet, 214..a shaft cover portion, 215..a peripheral wall portion 216..step, 2161..first opposing face, 2162..second opposing face, a third opposing face, a fourth opposing face, a fif