Motor-operated pump having a projection for protecting a commuta

Details Motor-operated pump having a projection for protecting a commuta Motor-operated pump having a projection for protecting a commuta

1990-05-25

1992-02-18

Bertsch, Richard A.

Pumps

Motor driven

Including means utilizing pump fluid for augmenting cooling,...

4174237, 310 90, F04D 1308

Patent

active

050889001

ABSTRACT:
A motor-operated pump of the in-tank type including a motor for driving the pump, the motor having a commutator; a bracket covering one end of the motor disposed adjacent to the commutator; a brush held against the commutator through a through hole formed in the bracket; and a bearing for supporting a shaft of the motor. An annular projection is formed on a central portion of a surface of bracket disposed in opposed relation to the commutator, and the annular projection is formed integrally with the bracket. Alternatively, an annular projection is formed on a central portion of the commutator disposed in opposed relation to the bearing, and the annular projection is made of an electrically insulating material constituting the commutator, and is formed integrally with the commutator.

REFERENCES:
patent: 1592326 (1926-07-01), Bastian
patent: 3495115 (1970-02-01), Lucas
patent: 3676025 (1972-07-01), Shultz et al.
patent: 4447192 (1984-05-01), Tuckey
patent: 4800309 (1989-01-01), Lakin
patent: 4887916 (1989-12-01), Adam et al.
patent: 4948346 (1990-08-01), Tuckey
Patent Abstracts of Japan, vol. 13, No. 76 (M-800)(3424), Feb. 21, 1989.
JP-A 63-27994 (Nippon Denso Co., Ltd.), Nov. 10, 1988.

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