Brush holding device capable of reducing noise
AssigneeAsmo Co., Ltd.
InventorsTakahiro Yamada, Hisashi Masui, Noriyuki Suzuki, Takashi Saito, Mitsuo Odagiri, Toshiyasu Ishizuka
Life of this patent
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Abstract
A brush holding device includes a dielectric resin circuit board and at least one metal brush holder secured to the circuit board at its base portion. Each brush holder includes a receiving recess that receives a brush and a spring for urging the brush against a commutator. A side wall of the brush holder located at a radially outer side of the brush holder includes an engaging piece that resiliently engages against an inner peripheral surface of an outer peripheral wall of the circuit board.
Claims26
A brush holding device comprising a dielectric resin circuit board and at least one metal brush holder secured to said circuit board at its base portion, said circuit board being secured to a motor housing, each said brush holder including a receiving recess that receives a brush and a spring for urging said brush against a commutator, wherein one of said each brush holder and said circuit board or said housing has at least one engaging portion integrally formed therein for achieving resilient engagement between said each brush holder and said circuit board or said housing.
A brush holding device comprising a dielectric resin circuit board and at least one metal brush holder secured to said circuit board at its base portion, said circuit board being secured to a motor housing, each said brush holder including a receiving recess that receives a brush and a spring for urging said brush against a commutator, wherein:
- one of said each brush holder and said circuit board or said housing has at least one engaging portion integrally formed therein for achieving resilient engagement between said each brush holder and said circuit board or said housing;
- said at least one engaging portion includes at least one engaging piece that is integrally formed in a rear end wall of said each brush holder and exerts resilient force, wherein the rear end wall of said each brush holder is located at a radially outer side of said each brush holder and is engaged with the spring, and said at least one engaging piece resiliently engages against said circuit board.
A brush holding device comprising a dielectric resin circuit board and at least one metal brush holder secured to said circuit board at its base portion, said circuit board being secured to a motor housing, each said brush holder including a receiving recess that receives a brush and a spring for urging said brush against a commutator, wherein:
- one of said each brush holder and said circuit board or said housing has at least one engaging portion integrally formed therein for achieving resilient engagement between said each brush holder and said circuit board or said housing;
- and
- said at least one engaging portion includes at least one engaging piece that extends from a top portion of a rear end wall of said each brush holder and resiliently engages against a corresponding radially outer portion of said circuit board or a corresponding radially outer portion of said housing, wherein the rear end wall of said each brush holder is located at a radially outer side of said each brush holder and is engaged with the spring.
An electric motor brush holder, comprising:
- a casing including a receiving recess for receiving a brush and for receiving a spring for pressing the brush against a commutator;
- and
- at least one engaging portion integrally formed with the casing for achieving resilient engagement between the brush holder and one of a circuit board and a housing.
Dependencies are inferred from the claim text.