Angled-edge controlled fuel injection pump for internal combusti

Details Angled-edge controlled fuel injection pump for internal combusti Angled-edge controlled fuel injection pump for internal combusti

1978-05-01

1980-01-22

Smith, Leonard E.

Pumps

Expansible chamber type

Pumping member position controlled port

123139AA, 123139AD, F04B 704, F02M 5926

Patent

active

041848160

ABSTRACT:
An edge controlled fuel injection pump for internal combustion engines, whose axially and rotationally movable pump piston, guided within the pump cylinder, has an improved leakage oil return system, which avoids piston wear and increased oil leakage even under very high injection pressures and relatively short piston strokes. The pump piston has an annular leakage oil collecting groove next to, but separate from, the recess that serves to end the fuel delivery, and a plurality of narrow leakage oil return grooves, which are formed in the outer surface of the piston diametrically opposite the recess and are connected with the collecting groove. Of these leakage oil return grooves, at least one is always connected with a leakage oil bore in the pump cylinder to a chamber of low pressure in the pump during the useful stroke of the piston.

REFERENCES:
patent: 2420164 (1947-05-01), Bremser
patent: 3857653 (1974-12-01), Mowbray

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