Electric fuel pump with arcuate relief recess

Details Electric fuel pump with arcuate relief recess Electric fuel pump with arcuate relief recess

1993-11-30

1995-02-21

Bertsch, Richard A.

Pumps

Motor driven

Electric or magnetic motor

41742314, 415 551, F04B 1700

Patent

active

053910621

ABSTRACT:
An electric fuel pump having high fuel discharge efficiency in which the frictional resistance between the pump casing and the impeller is reduced, and any decrease in the speed of rotation of the motor and increase in power consumption are prevented. According to the present invention, in an electric fuel pump, a relief recess (or clearance) larger in depth than small gaps between an impeller and the slide surfaces of a pump casing through which the impeller is supported by the pump casing is formed in the slide surface which confronts a pump chamber outlet, near the pump chamber outlet and inwardly of the pump chamber.

REFERENCES:
patent: 4451213 (1984-05-01), Takei et al.
patent: 4586877 (1986-05-01), Watanabe et al.
patent: 4822258 (1989-04-01), Matsuda et al.
patent: 4854830 (1989-08-01), Kozawa et al.
patent: 4872806 (1989-10-01), Yamada et al.
patent: 4915582 (1990-04-01), Nishikawa

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