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US 12,184,154 B2Granted
Drive device and vehicle
AssigneeNidec Corporation
InventorsKeigo Nakamura, LiPeng Li, Takashi Shiraishi, Yoshiyuki Aono
Life of this patent
Estimating the term…
Abstract
A drive device includes a first bearing lubricated by a fluid and a second bearing lubricated by a lubricant having a higher electrical conductivity than the fluid. The first bearing rotatably supports a shaft extending in the axial direction along the rotation axis. A housing of the drive device has a first bearing holder that holds the first bearing. The second bearing is arranged between the shaft and the housing and rotatably supports the shaft. The second bearing is arranged in a space isolated from the first bearing holder.
Claims16
A drive device comprising:
- a shaft extending in an axial direction along a rotation axis;
- a rotor fixed to the shaft and rotatable about the rotation axis;
- a stator facing the rotor in a radial direction with a gap between the stator and the rotor;
- a first bearing that rotatably supports the shaft and is lubricated by a fluid;
- a housing that includes a first bearing holder holding the first bearing and accommodates the rotor and the stator;
- and
- a second bearing that is arranged between the shaft and the housing, rotatably supports the shaft, and is lubricated by a lubricant having a higher electrical conductivity than the fluid,
- wherein the second bearing is arranged in a space isolated from the first bearing holder, wherein
- the housing includes a first columnar portion extending in the axial direction along the rotation axis,
- the shaft includes a shaft recess recessed from one axial end portion to another axial end portion of the shaft,
- the shaft recess accommodates at least another axial side of the first columnar portion,
- the second bearing is fitted to the shaft recess, and
- a radially inner end portion of the second bearing contacts a radially outer surface of the first columnar portion.
10 more elements
A drive device comprising:
- a shaft extending in an axial direction along a rotation axis;
- a rotor fixed to the shaft and rotatable about the rotation axis;
- a stator facing the rotor in a radial direction with a gap between the stator and the rotor;
- a first bearing that rotatably supports the shaft and is lubricated by a fluid;
- a housing that includes a first bearing holder holding the first bearing and accommodates the rotor and the stator;
- and
- a second bearing that is arranged between the shaft and the housing, rotatably supports the shaft, and is lubricated by a lubricant having a higher electrical conductivity than the fluid,
- wherein the second bearing is arranged in a space isolated from the first bearing holder, wherein
- the shaft includes:
- a shaft tubular portion surrounding the rotation axis,
- a shaft through-hole penetrating the shaft tubular portion in the radial direction or in a direction intersecting the radial direction and the axial direction,
- the fluid is able to flow inside the shaft tubular portion and is supplied to the first bearing through the shaft through-hole,
- a shaft wall that is arranged inside the shaft tubular portion and expands in the radial direction,
- a radially outer end portion of the shaft wall is connected to an inner peripheral surface of the shaft tubular portion,
- the second bearing is arranged on one axial side of the shaft wall inside the shaft tubular portion, and
- the shaft through-hole is arranged on another axial side of the shaft wall.
13 more elements
A drive device comprising:
- a shaft extending in an axial direction along a rotation axis;
- a rotor fixed to the shaft and rotatable about the rotation axis;
- a stator facing the rotor in a radial direction with a gap between the stator and the rotor;
- a first bearing that rotatably supports the shaft and is lubricated by a fluid;
- a housing that includes a first bearing holder holding the first bearing and accommodates the rotor and the stator;
- and
- a second bearing that is arranged between the shaft and the housing, rotatably supports the shaft, and is lubricated by a lubricant having a higher electrical conductivity than the fluid,
- wherein the second bearing is arranged in a space isolated from the first bearing holder, wherein
- the housing includes
- a housing tubular portion that extends in the axial direction and surrounds the rotation axis,
- a housing lid that has an opening through which the shaft is inserted and is arranged at one axial end portion of the housing tubular portion, and
- a cover member that is arranged at one axial end portion of the housing lid and covers the opening,
- the shaft includes
- a shaft tubular portion that surrounds the rotation axis and is rotatably supported by the first bearing,
- a shaft wall that is arranged on one axial side of the shaft tubular portion and expands in the radial direction, and
- a second columnar portion extending from the shaft wall to the one axial side,
- the cover member includes a second bearing holder holding the second bearing, and
- the second bearing rotatably supports the second columnar portion.
15 more elements
A drive device comprising:
- a shaft extending in an axial direction along a rotation axis;
- a rotor fixed to the shaft and rotatable about the rotation axis;
- a stator facing the rotor in a radial direction with a gap between the stator and the rotor;
- a first bearing that rotatably supports the shaft and is lubricated by a fluid;
- a housing that includes a first bearing holder holding the first bearing and accommodates the rotor and the stator;
- and
- a second bearing that is arranged between the shaft and the housing, rotatably supports the shaft, and is lubricated by a lubricant having a higher electrical conductivity than the fluid,
- wherein the second bearing is arranged in a space isolated from the first bearing holder,
- the shaft is provided facing the first bearing holder with a gap between in the radial direction,
- the second seal member is arranged between the outer peripheral surface of the shaft and the inner peripheral surface of the first bearing holder, and
- the second seal member is arranged between the first bearing and one axial end portion of the shaft in the axial direction.
8 more elements
Dependencies are inferred from the claim text.