Brush holder arrangement of DC motor
AssigneeDenso Corporation
InventorsMasami Niimi, Akifumi Hosoya
Life of this patent
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Abstract
A DC motor includes an armature, an armature shaft, a commutator, a plurality of brushes in contact with the commutator, a plurality of brush springs for respectively biasing the brushes against the commutator, and a brush holder unit for holding the pair of brushes. Each of the brush springs comprises a springy spring body disposed at a side of corresponding one of the brushes and a spring arm extending from the spring body to bias the rear end of the corresponding one of the brushes against the commutator, and the spring body has an outer periphery disposed within the axial length of the corresponding one of the brushes.
Claims6
A DC motor including an armature, an armature shaft, a commutator and a brush holder unit having a plurality of brushes in contact with said commutator and a plurality of brush springs for respectively biasing said brushes against said commutator, wherein
- said commutator comprises a face-contact commutator having a brush contact surface perpendicular to said armature shaft,
- each of said brush springs comprises a spring body disposed at a side of a corresponding one of said brushes opposite said brush contact surface and a spring arm extending from said spring body to bias the corresponding one of said brushes against said commutator, and
- said spring body has an outer periphery disposed within the axial length of said corresponding one of said brushes.
Dependencies are inferred from the claim text.