Fuel injection pump

Internal-combustion engines – Charge forming device – With fuel pump

Patent

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Details

123450, 123447, F02M 3900

Patent

active

048401625

ABSTRACT:
In a fuel injection pump for internal combustion engines having at least one pump piston defining a pump work chamber and set into reciprocating motion by a cam drive for executing an intake stroke and a supply stroke, and having an electrical switching valve controlling the duration of supply and disposed in a relief line leading from the pump work chamber to a pump interior, a non-return valve having an opening direction toward the pump work chamber is disposed in a fuel inflow line connecting the pump interior with the pump work chamber in order to attain an emergency stoppage of the engine in the event the switching valve malfunctions. The valve element of the non-return valve is acted upon on one side by a valve closing spring and on the other by a fuel-filled control chamber, with which the valve element is locked in its closing position during the closed position of the switching valve.

REFERENCES:
patent: 3500749 (1970-03-01), Kemp
patent: 4395987 (1983-08-01), Kobayashi
patent: 4459963 (1984-07-01), Gross
patent: 4546749 (1985-10-01), Igashira
patent: 4574759 (1986-03-01), LeBlanc
patent: 4601274 (1986-07-01), Seilly
patent: 4625694 (1986-12-01), Adey
patent: 4655184 (1987-04-01), Eckert
patent: 4691679 (1987-09-01), Lakin
patent: 4764092 (1988-08-01), Thornwaite

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