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公开(公告)号：US20190305652A1
公开(公告)日：2019-10-03
申请号：US16361922
申请日：2019-03-22
Applicant: DENSO CORPORATION
Inventor： Takashi HIRABAYASHI , Taro FUKUDA
Abstract: A starter includes a motor configured with a direct current motor. The direct current motor has a brush and a commutator. The brush is a sintered material formed of graphite and a copper powder. The commutator is formed of either copper or a copper alloy that has a copper content of 99% or more. A surface of is a sliding portion of the commutator which has sliding movement with the brush is provided with a graphite cover-layer that contains graphite as a main component. The graphite cover-layer contains a hard compound which has a Vickers hardness higher than 10 GPa and a metal sulfide solid lubricant.
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