Internal-combustion engines – Charge forming device – With fuel pump
Patent
1986-06-04
1989-02-21
Miller, Carl Stuart
Internal-combustion engines
Charge forming device
With fuel pump
123446, 123447, 123467, F02M 3900
Patent
active
048055808
ABSTRACT:
A fuel injection device having a pump piston which during the supply stroke pumps fuel from a pump work chamber into an injection line which leads to a fuel injection valve. Directly adjacent to the branching off of the injection line from the pump work chamber, at the diameter of the injection line, a valve seat is provided, at which the injection line then merges with a chamber into which a pressure valve closing member plunges. The valve closing member is tightly guided in a guide bore, loaded by a valve spring, and in the chamber has a pressure shoulder adjoining the sealing surface that cooperates with the valve seat. The rear side of the pressure valve closing member communicates with a continuously open relief line. Because of this construction, the pressure valve closing member operates as an equal-pressure valve and simultaneously as a deflecting piston as well, with the aid of which a pressure rise in the pump work chamber is built up in a retarded manner until such time as the pressure valve closing member comes to rest on a stop. A pressure rise of this type is particularly advantageous in connection with control of the injection phase by means of a magnetic valve subjected to the high pressure.
REFERENCES:
patent: 2421475 (1947-06-01), Beeh
patent: 2628570 (1953-02-01), De Luca
patent: 4129256 (1978-12-01), Bader
patent: 4158442 (1979-06-01), Rothmayr
patent: 4554903 (1985-11-01), Straubel
patent: 4622942 (1986-11-01), Nozaki
Buisson Dominique
Henry Francois
Leblanc Jean
Pfeifle Helmut
Pigeroulet Jean
Greigg Edwin E.
Miller Carl Stuart
Robert & Bosch GmbH
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