Fuel injection pump for internal combustion engines

Details Fuel injection pump for internal combustion engines Fuel injection pump for internal combustion engines

1982-07-15

1984-04-10

Smith, Leonard E.

Pumps

Expansible chamber type

Pumping member position controlled port

417499, F02M 5944

Patent

active

044418680

ABSTRACT:
There is proposed an improved fuel injection pump which will prevent erosion at the pump housing caused by the fuel stream leaving the return flow openings at the end of injection, by providing an impact protection ring on the cylinder bushing. Guide faces on the ring inclined toward the center (M) thereof are molded into the impact protection ring in the vicinity of a cylindrical wall portion. The impact protection ring rests on an abutment shoulder disposed above the return flow openings, in the vicinity of the return flow openings encloses an annular chamber, and is pressed by a snap ring without play and with a defined prestressing force against the abutment shoulder. As a result of the guiding action of the guide faces on the impact protection ring, a rotational movement of the impact protection ring triggered by the obliquely exiting fuel stream is assured, in order to attain a long service life for the pump.

REFERENCES:
patent: 3885895 (1975-05-01), Staudt et al.
patent: 3945773 (1976-03-01), Vuaille
patent: 3985474 (1976-10-01), Vuaille

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