Dc motor for starter
AssigneeDenso Corporation
InventorTakashi HIRABAYASHI
Life of this patent
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Abstract
A DC motor is provided for use in a starter that starts an ermine. The DC motor includes a commutator and a brush. The commutator is formed of copper or a copper alloy whose copper percentage content is higher than or equal to 99 mass %. The brush is arranged in sliding contact with a surface of the commutator. Moreover, the brush is formed of a sintered compact that contains graphite, copper and at least one metal sulfide solid lubricant. The percentage content of copper in the sintered compact is 30-70 mass %. The at least one metal sulfide solid lubricant includes tungsten disulfide. The percentage content of tungsten disulfide in the sintered compact is higher than or equal to 6.5 mass %.
Claims11
A DC motor for a starter that starts an engine, the DC motor comprising:
- a commutator formed of copper or a copper alloy whose copper percentage content is higher than or equal to 99 mass %;
- and
- a brush arranged in sliding contact with a surface of the commutator, wherein
- the brush is formed of a sintered compact that contains graphite, copper and at least one metal sulfide solid lubricant,
- a percentage content of copper in the sintered compact is 30-70 mass %,
- the at least one metal sulfide solid lubricant comprises tungsten disulfide, and
- a percentage content of tungsten disulfide in the sintered compact is higher than or equal to 6.5 mass %.
Dependencies are inferred from the claim text.