To reduce the manufacturing cost of a flat commutator by preventing a resin material from adhering on the sliding contact surface of segment pieces, in molding the resin material.
A plurality of segment pieces are attached on a resin-made cartridge 33, equipped with a plurality of partitions 36 arranged in a circumferential direction. A convex portion 37, protruding from both side surfaces in a circumferential direction, is provided on each of the partitions 36, and each of the segment pieces is attached with the convex portion 37 deformed elastically and are held on the cartridge 33 by using the elastic force. In addition, an inclined surface 36a is formed on each of the partitions 36; and when a holder portion is molded with a resin integrally with the segment pieces in a state where the segment pieces are attached on the cartridge 33 a papered surface is formed on the outer circumferential portion between the segment pieces on the holder portion. Thus, the outer circumferential portion can be prevented from becoming chipped, when the cartridge 33 is to be detached from the segment pieces, after molding the holder portion.
ISODA MINORU
UEHARA SHUJI
KANAI YASUHIRO
ARAMAKI KENICHI
JPS5859576A | 1983-04-08 |
WO2003050932A1 | 2003-06-19 |
Yoshitaka Kozuka
Akiko Tsutsui