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US 10,312,771 B2Granted
Brushless motor
AssigneeTokyo Parts Industrial Co., Ltd.
InventorMasahiro Nishidate
Life of this patent
Estimating the term…
Abstract
The bottom end of a rotary shaft contacts a cover part of a cover member, while the top end of the rotary shaft protrudes upwards from a retaining plate. A planar first washer member, which is made from a hard material, is fastened to the rotary shaft, between a bottom plate of a rotor case and an oil-impregnated bearing. The first washer member is disposed without contact with the bottom plate of the rotor case and the oil-impregnated bearing.
Claims9
A brushless motor comprising:
- a bearing holder having a first cylindrical portion;
- an oil-impregnated bearing fastened to the inner circumferential face of the bearing holder;
- a rotary shaft supported by the oil-impregnated bearing so as to be rotatable around a vertically oriented central axis;
- a rotor having a rotor case, which is fastened to the rotary shaft, and a rotor magnet, the rotor case having a second cylindrical portion and a bottom plate portion, the bottom plate portion closing a bottom end of the second cylindrical portion, and the rotor magnet fastened to a circumferential face of the rotor case;
- a stator, arranged so as to face the rotor magnet in a radial direction;
- a retaining plate that extends radially outward from a top of the first cylindrical portion;
- and
- a cover member, which has a third cylindrical portion and a cover portion that closes a bottom end of the third cylindrical portion, a top end of the third cylindrical portion being fastened directly to the retaining plate, so as to cover the rotor and the stator, wherein:
- a bottom end of the rotary shaft contacts the cover member and a top end of the rotary shaft protrudes upward from the retaining plate;
- a first washer member, which is made from a hard material and has a flat face, is fastened to the rotary shaft, between the bottom plate portion and the oil-impregnated bearing;
- and
- the first washer member is disposed without contact with the bottom plate portion and the oil-impregnated bearing.
9 more elements
Dependencies are inferred from the claim text.