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US 12,573,914 B2Granted
Outer rotor type motor
AssigneeShinano Kenshi Co., Ltd.
InventorMasahiko Uni
Life of this patent
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Abstract
In an outer rotor type motor (M) including a rotor (3) rotatably supported about a rotor shaft (3c) inserted into a sintered oil-retaining bearing (8), a sintered felt (9) made of a porous metal and supplying lubricating oil to the sintered oil-retaining bearing (8) is concentrically fitted to an outer periphery on one end side in an axial direction of the sintered oil-retaining bearing (8) and housed in a stator housing (6) in a range where the sintered felt (9) does not overlap with a stator core (7) assembled to an outer periphery of the stator housing (6) in a radial direction.
Claims3
An outer rotor type motor comprising:
- a stator in which a stator core is assembled to an outer periphery of a tubular stator housing, and a sintered oil-retaining bearing made of a porous sintered metal is concentrically assembled to an inner periphery of the stator housing;
- and
- a rotor rotatably supported about a rotor shaft inserted into the sintered oil-retaining bearing,
- wherein an annular oil-supply member made of a porous sintered metal and supplying lubricating oil to the sintered oil-retaining bearing is concentrically fitted to an outer periphery on one end side in an axial direction of the sintered oil-retaining bearing and housed in the stator housing in a range where the oil-supply member does not overlap with the stator core assembled to the outer periphery of the stator housing in a radial direction and
- a size of a gap between an outer peripheral surface of the oil-supply member and an inner peripheral surface of the stator housing is from 0.05 mm to 0.5 mm inclusive in the radial direction and 5.0 mm or more in the axial direction.
2 more elements
Dependencies are inferred from the claim text.