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US 10,320,264 B2Granted
Brushless motor
AssigneeTokyo Parts Industrial Co., Ltd.
InventorMasahiro Nishidate
Life of this patent
Estimating the term…
Abstract
A cover member has a through hole in the center. A rotary shaft protrudes upward from the through hole, without contact with the cover member. A first washer member, which is made from a hard material, is fastened to the rotary shaft, between the rotor case and the cover member. The first washer member is disposed without contact with the rotor case and the cover member.
Claims20
A brushless motor, comprising:
- a bearing holder having a cylindrical shape and being open at a top end and closed at a bottom end, the bearing holder having a first cylindrical portion and a bottom portion, the bottom portion closing the bottom end;
- a first oil-impregnated bearing fastened to an inner circumferential face of the first cylindrical portion;
- a rotary shaft rotatably supported by the first oil-Impregnated bearing;
- a rotor having a rotor case, which is fastened to the rotary shaft and has a second cylindrical portion and a top plate portion that closes a top end of the second cylindrical portion, and a rotor magnet fastened to a circumferential face of the second cylindrical portion;
- a stator, arranged so as to face the rotor magnet in the radial direction;
- a retaining plate fixed to said bottom portion and that extends outward in the radial direction from said bottom portion;
- and
- a cover member, which has a third cylindrical portion and a roof that closes a top end of the third cylindrical part, a bottom end of the third cylindrical portion being fastened to the retaining plate, so as to encase the rotor and the stator,
- wherein:
- the cover member has a through hole in the center of the roof;
- the rotary shaft protrudes upwards from the through hole without contact with the roof;
- a first washer member, which is made from a hard material and has a flat face, is fastened to the rotary shaft, between the top plate and the roof;
- and
- the first washer member is disposed without contact with the top plate or the roof.
11 more elements
A brushless motor, comprising:
- a bearing holder having a cylindrical shape and being open at a top end and closed at a bottom end, the bearing holder having a first cylindrical portion and a bottom portion, the bottom portion closing the bottom end;
- a first oil-impregnated bearing fastened to an inner circumferential face of the first cylindrical portion;
- a rotary shaft rotatably supported by the first oil-impregnated bearing;
- a rotor having a rotor case, which is fastened to the rotary shaft and has a second cylindrical portion and a top plate that closes a top end of the second cylindrical portion, and a rotor magnet fastened to a circumferential face of the second cylindrical portion;
- a stator, arranged so as to face the rotor magnet in the radial direction;
- a retaining plate fixed to said bottom portion and that extends outward in the radial direction from said bottom portion;
- a cover member, which has a third cylindrical portion and a roof that closes a top end of the third cylindrical portion, a bottom end of the third cylindrical portion being fastened to the retaining plate, so as to cover the rotor and the stator;
- and
- a second oil-impregnated bearing,
- wherein:
- the cover member has a cylinder in the center of the roof;
- the second oil-impregnated bearing is fastened to the cylinder;
- the rotary shaft protrudes upward from the cylinder, without contact with the second oil-impregnated bearing;
- a first washer member, which is made from a hard material and has a flat face, is fastened to the rotary shaft, between the top plate and the second oil-impregnated bearing;
- and
- the first washer member is disposed without contact with the top plate or the second oil-impregnated bearing.
13 more elements
Dependencies are inferred from the claim text.