Gas-actuated fuel pump wherein the pump piston is driven by a sp

Details Gas-actuated fuel pump wherein the pump piston is driven by a sp Gas-actuated fuel pump wherein the pump piston is driven by a sp

1977-12-08

1979-02-27

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Having means to hold or resist movement of pumping element

417380, 417399, 123139AJ, 92 84, 92 137, F04B 1700, F04B 3500, F16J 110

Patent

active

041416759

ABSTRACT:
A fuel pump for providing fuel at relatively high pressure is activated by gas pressure, created during the compression stroke of an internal combustion engine. The pump includes a piston and a hollow plunger which are biased by a single spring in opposite directions. The piston, which is exposed to gases in the engine's cylinder, is urged, by the gas pressure in the cylinder during the compression stroke, to move upwardly. A limit is placed on the piston's upward stroke. When reaching the upward limit the pressure which is applied to fuel in a fuel chamber is only a function of the force applied by the spring to the plunger. When fuel ejection is enabled, the spring pushes the plunger toward the fuel chamber to eject the fuel therefrom. Toward the end of the exhaust stroke the piston moves toward the engine cylinder, forcing the plunger to move in the same direction until the latter's travel is limited by limiting means. Fuel is then injectable into the fuel chamber for subsequent ejection.

REFERENCES:
patent: 1376277 (1921-04-01), Higgins
patent: 1520852 (1924-12-01), Cable
patent: 1868766 (1932-07-01), Reynolds
patent: 1981667 (1934-11-01), Rockwell
patent: 2064750 (1936-12-01), Hurst
patent: 3769879 (1973-11-01), Lofquist

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