Title:
DC MOTOR
Document Type and Number:
Japanese Patent JP2020005490
Kind Code:
A
Abstract:
To provide a DC motor capable of suppressing commutator wear.SOLUTION: A DC motor 40 used for a starter S for starting an engine includes: a commutator 20 formed of copper or a copper alloy of 99% or more of copper; and a brush 30 for sliding on a surface 20A of the commutator 20. The brush 30 is made of a sintered body containing graphite, copper powder, and a metal sulfide solid lubricant. The amount of copper powder contained in the sintered body is 30 to 70 mass% of the sintered body. As a metal sulfide solid lubricant, tungsten disulfide is contained in the amount of 6.5 mass% or more of the sintered body.SELECTED DRAWING: Figure 5
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Inventors:
HIRABAYASHI TAKASHI
Application Number:
JP2019046304A
Publication Date:
January 09, 2020
Filing Date:
March 13, 2019
Export Citation:
Assignee:
DENSO CORP
International Classes:
H02K13/00; H01R39/04; H01R39/26
Domestic Patent References:
| JP2003100411A | 2003-04-04 | |||
| JPS5040761B1 | 1975-12-26 | |||
| JP2006280164A | 2006-10-12 | |||
| JP2007028841A | 2007-02-01 | |||
| JP2007306724A | 2007-11-22 | |||
| JP2004242383A | 2004-08-26 | |||
| JP2009051979A | 2009-03-12 |
Attorney, Agent or Firm:
Tsuyoshi Yamada
Kyoko Hino
Hiroshi Matsuda
Yusuke Kita
Kyoko Hino
Hiroshi Matsuda
Yusuke Kita