Electric fuel pump

Details Electric fuel pump Electric fuel pump

1998-09-18

2000-10-24

Yuen, Henry C.

Pumps

Motor driven

Electric or magnetic motor

41742314, 415 551, F04B 1700, F04B 3504

Patent

active

061357308

ABSTRACT:
The provision of an electric fuel pump in which the rotational frictional resistance between the pump casing and the impeller is made small to prevent the decrease of the motor rotational number and the increase of the current consumption and in which the discharge efficiency is improved. In a pump casing 17 supporting the impeller 1 by the sliding surface 3a of the pump base 3 and the sliding surface 16a of the pump cover 16 and at the inner circumference side of the pump chamber 4 in the vicinity of the side 6a opposing to the pump chamber outlet 6 of the sliding surface 16a of the pump cover 16, the provision is made of an abutment relief portion 16b having a gap larger than said small gap, and a stepped side wall 16c defined at an end portion 19 downstream of the side of said abutment relief portion 16b opposing to said pump chamber outlet 6.

REFERENCES:
patent: 4784587 (1988-11-01), Takei et al.
patent: 4872806 (1989-10-01), Yamada et al.
patent: 4915582 (1990-04-01), Nishikawa
patent: 5391062 (1995-02-01), Yoshioka

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