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Title:
BRUSH DEVICE AND MOTOR HAVING BRUSH DEVICE
Document Type and Number:
Japanese Patent JP2012205400
Kind Code:
A
Abstract:

To provide a brush device that allows contact pressure on a contact surface between a commutator and a brush to be different on an upstream side, and on a downstream side, in a rotational direction of the commutator so as to produce a difference in contact resistance and that thereby prevents spark discharge caused when the brush and the commutator become separated from each other, and to provide a motor having the brush device.

A brush device includes: a brush main body 11 that has a contact surface T, which comes into contact with a commutator 4 that is rotated in a single direction, on a forward end surface thereof in a thickness direction; and urging means 13 that urges the brush main body 11 in a direction of the commutator 4. The urging means 13 presses the brush main body 11 against an upstream side of the contact surface T in a rotational direction of the commutator 4.


Inventors:
HARADA HIROYUKI
Application Number:
JP2011067982A
Publication Date:
October 22, 2012
Filing Date:
March 25, 2011
Export Citation:
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Assignee:
ASMO CO LTD
International Classes:
H02K13/00; H01R39/38; H02K23/00
Domestic Patent References:
JP2008005691A2008-01-10
JP2007023784A2007-02-01
JP2008099438A2008-04-24
Attorney, Agent or Firm:
Atsushi Akiyama
Yuriko Shirota



 
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