Brushless motor

Details Brushless motor Brushless motor

1994-06-20

1997-03-11

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 708, H02K 516

Patent

active

056104626

ABSTRACT:
There is disclosed a brushless motor in which an oil-impregnated sleeve bearing is inserted in a bearing holder having a cylindrical shape with a closed bottom, and a rotating shaft is inserted in the oil-impregnated sleeve bearing in such a manner that the rotating shaft may freely rotate. With this arrangement, it becomes possible to prevent lubricant from leaking out without increasing either the number of component elements or the number of assembling steps. The oil-impregnated sleeve bearing comprises an inner and outer layers. An oil seat is disposed on the oil-impregnated sleeve bearing at the open-end side of the bearing holder. The percentages of voids are set such that the percentages of voids become lower in the order of the oil seal, the outer layer, and the inner layer. With the above arrangement, the lubricant can be prevented from leaking out through a gap of the bearing, and therefore reduction of life due to the leakage of lubricant can also be prevented.

REFERENCES:
patent: 3772544 (1973-11-01), Wrobel
patent: 3777191 (1973-12-01), Papst et al.
patent: 3786290 (1974-01-01), Papst et al.
patent: 4013326 (1977-03-01), King
patent: 4612468 (1986-09-01), Sturm et al.
patent: 4613778 (1986-09-01), Wrobel et al.
patent: 4856918 (1989-08-01), Inoue et al.
patent: 4955791 (1990-09-01), Wrobel
patent: 5258672 (1993-11-01), Wrobel

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