Gear-within-gear fuel pump and method of pressure balancing same

Details Gear-within-gear fuel pump and method of pressure balancing same Gear-within-gear fuel pump and method of pressure balancing same

1987-09-25

1989-04-11

Smith, Leonard E.

Rotary expansible chamber devices

Pressure fluid radially balances working or rotating...

418171, F04C 210

Patent

active

048201383

ABSTRACT:
A gear-within-gear positive displacement pump, such as an automotive fuel pump, is disclosed having a pump chamber, an internal gear within the pump chamber, and an external gear within the internal gear. The pump chamber has an inlet and an outlet. The external gear is rotatably driven thereby causing the internal gear to rotate and further causing the teeth of the internal and external gears to unmesh thereby drawing fluid into the pump chamber between the gears and further causing the teeth of the gears to mesh so as to positively force the fluid out of the pump chamber. A pressure balancing passage way is provided between the portion of the pump housing in which the gear teeth mesh thereby permitting fluid under pressure to be directed to the exterior of the internal gear so as to pressure bias the internal gear generally toward the inlet and to at least in part balance the pressure forces on the internal gear with a consequent reduction of noise and increase in pump efficiency. A method of pressure balancing the forces on the internal gear is also disclosed.

REFERENCES:
patent: 2132813 (1938-10-01), Wahlmark
patent: 3680989 (1972-08-01), Brundage
patent: 4199305 (1980-04-01), Pareja
patent: 4462761 (1984-07-01), Ringwald
patent: 4526518 (1985-07-01), Wiernicki
patent: 4580951 (1986-04-01), Carleton et al.
patent: 4596519 (1986-06-01), Tuckey
patent: 4619588 (1986-10-01), Moore, III
patent: 4629399 (1986-12-01), Friebe
patent: 4642030 (1987-02-01), Friebe et al.
patent: 4645430 (1987-02-01), Carleton
patent: 4662827 (1987-05-01), Wiernicki

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