Pumps – Expansible chamber type – Pumping member position controlled port
Patent
1982-07-14
1984-05-01
Smith, Leonard E.
Pumps
Expansible chamber type
Pumping member position controlled port
417499, F02M 5944
Patent
active
044458282
ABSTRACT:
In order to prevent erosion of the pump housing caused by the fuel stream exiting from the return flow openings at the end of injection, it is proposed that the fuel injection pump be provided with an impact protection ring pushed over the cylinder bushing. Adjacent to a cylindrical wall portion, the impact protection ring carries a radially outwardly bent, circular-annular collar. The collar rests on an abutment shoulder disposed above the return flow openings and has an end face whose area is a multiple of the cross sectional area of the cylindrical wall portion. The impact protection ring encloses an annular chamber, provided with a narrow radial gap (s), in the vicinity of the return flow opening and is pressed by a snap ring against the abutment shoulder. As a result of the pressure build-up in the annular chamber and as a result of a slide bearing effect between the collar and the abutment shoulder, a rotational movement of the impact protection ring triggered by the obliquely exiting fuel stream is assured, for the purpose of attaining long service life of the fuel injection pump.
REFERENCES:
patent: 2265997 (1941-12-01), Bremser
patent: 2571501 (1951-10-01), Truxell
patent: 3885895 (1975-05-01), Staudt et al.
patent: 3945773 (1976-03-01), Vuaille
patent: 3985474 (1976-10-01), Vuaille
Greigg Edwin E.
Robert & Bosch GmbH
Smith Leonard E.
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