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US 10,309,458 B2Granted
Brushless motor
AssigneeTokyo Parts Industrial Co., Ltd.
InventorMasahisa Tuchiya
Life of this patent
Estimating the term…
Abstract
A double bearing comprising an inner bearing and an outer bearing, which has a greater oil content than the inner bearing, is used as a bearing for a brushless motor. The inner bearing has an upper bearing part, a lower bearing part, and a central relief part. Gaps are provided between the bearing parts and a bearing housing, along the entire axial length of all of the bearing parts of the inner bearing.
Claims18
A brushless motor comprising:
- a rotor having a shaft;
- a cylindrical bearing that supports the shaft in a radial direction with oil as an intermediary medium;
- and
- a bearing housing that is open at a top end, at an interior of which the bearing is fastened,
- wherein:
- the cylindrical bearing has an inner bearing made from a porous oil-impregnated material and an outer bearing made form a porous oil-impregnated material, mounted on an outer circumferential face of the inner bearing;
- the inner bearing has a bearing portion formed protruding in a radially inward direction, so as to rotatably support the radial direction of the shaft;
- the oil content of the outer bearing is greater than that of the inner bearing and so that the outer bearing supplies oil to the inner bearing;
- and
- a gap is provided between the bearing portion and the bearing housing located radially outward from the bearing portion, along an entire axial length of the bearing portion.
7 more elements
Dependencies are inferred from the claim text.