Motor vehicle fuel pump assembly with pressure relief orifice

Details Motor vehicle fuel pump assembly with pressure relief orifice Motor vehicle fuel pump assembly with pressure relief orifice

1993-06-21

1995-01-03

Bentsch, Richard A.

Pumps

Diverse pumps

Including rotary nonexpansible chamber type

418189, 418225, F04B 2314

Patent

active

053781112

ABSTRACT:
A fuel pump-suited for a Demand System motor vehicle fuel injection system includes a lower pressure vapor separating pump stage, a roller vane positive displacement high pressure pump stage, and a variable speed electric motor for driving an impeller in the vapor separating stage and a rotor in the roller vane stage. The roller vane stage has a bleed orifice therein located on an inlet side plate of the roller vane stage to intercept succeeding ones of a plurality of vane pockets on the rotor between a downstream end of a discharge port of the roller vane stage and an upstream end of an inlet port of the roller vane stage when the vane pockets are isolated from both ports. The bleed orifice is in flow communication with a fuel tank of the vehicle and functions to relieve the pressure of fuel trapped in the roller pockets upstream of the inlet port and to recirculate an increasing fraction of the discharge of the roller vane stage back to the fuel tank which fraction as the speed of the electric motor decreases to a minimum.

REFERENCES:
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patent: 3947149 (1976-03-01), MacManus
patent: 4181473 (1980-01-01), Ina
patent: 4207038 (1980-06-01), Strikis
patent: 4259044 (1981-03-01), Drutchas et al.
patent: 4295797 (1981-10-01), Ruhl et al.
patent: 4336002 (1982-06-01), Rose et al.
patent: 4456436 (1984-06-01), Schillinger et al.
patent: 4484863 (1984-11-01), Pagel
patent: 4596521 (1986-06-01), Murayama et al.
patent: 4636153 (1987-01-01), Ishizuka et al.
patent: 4718827 (1988-01-01), Sutton et al.
patent: 4867658 (1989-09-01), Sugita et al.
patent: 5024578 (1991-06-01), Vansadia

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