Brush holder device

Details Brush holder device Brush holder device

1997-12-08

2000-02-29

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310241, 310242, 310245, 310249, H02K 1300

Patent

active

060313137

ABSTRACT:
In a brush holder device, in which an action-side end portion 22a of a torsion spring 22 is engaged with a torsion spring engaging groove 25 recessedly provided in an end surface of the brush 24 on the side opposite to a commutator 23, so that the elastic force of the torsion spring presses the brush against the commutator 23, a first inclined surface 26 is formed in the end surface of the brush 24 so as to incline at an angle of 15.degree. relative to a plane perpendicular to the axis of the brush, and second inclined surface 27 is formed in the engaging groove 25, being superposed on the first inclined surface 26. Further, a pigtail 28 is connected to the brush at an offset point relative to the engaging groove 25. Because of the second inclined surface, the torsion spring can suppress so-called "wild behavior" of the brush, and thereby, can prevent brush sound. The angle of inclination of the first inclined surface can be set at a small value, the brush can be molded using a molding die.

REFERENCES:
patent: 1935789 (1933-11-01), Cullin
patent: 2711491 (1955-06-01), Edmundson et al.
patent: 3518475 (1970-06-01), Sebok et al.
patent: 4559465 (1985-12-01), Gagneux
patent: 5053665 (1991-10-01), Yamaguchi et al.
patent: 5717271 (1998-02-01), Aoki et al.
Patent Abstracts of Japan--Publication No. 08154362, Jun. 11, 1996, Yaskawa Electric Corp.
Patent Abstracts of Japan--Publication No. 08214507, Aug. 20, 1996, Asmo Co., Ltd.

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