Fuel injection apparatus with an auxiliary pump for pilot and ma

Details Fuel injection apparatus with an auxiliary pump for pilot and ma Fuel injection apparatus with an auxiliary pump for pilot and ma

1984-08-24

1985-06-25

Miller, Carl Stuart

Internal-combustion engines

Combustion chamber means having fuel injection only

Using multiple injectors or injections

123514, 2395333, 239 88, 417251, F02M 4502

Patent

active

045247374

ABSTRACT:
A fuel injection apparatus having an auxiliary pump for pilot and main injections in internal combustion engines, in which a pilot injection quantity pumped by a low-pressure pump is stored ahead of a pilot injection piston embodied as a pressure piston, which is driven by a following but coaxially disposed intermediate piston, upon pumping by the high-pressure injection pump, and as a result positively displaces the pilot injection quantity. Both pistons are supported in an intermediate element between the connection piece of an injection valve and the nozzle holder of the valve. The intermediate element combines not only the elements for the auxiliary pump but also the leak-off bores from the nozzles with the leak-off removal means of the two-part stepped piston supported therein. The invention makes it possible to install the auxiliary pump in a double injection valve in a space-saving manner, without having to change the dimensions of the injection valve except for a slight lengthening, and as a result no changes need to be made in the engine or injection pump.

REFERENCES:
patent: 2137473 (1938-11-01), Makins
patent: 2173814 (1939-09-01), Bischof
patent: 2317618 (1943-04-01), King
patent: 3394891 (1968-07-01), Voit
patent: 3403861 (1968-10-01), Eidtmann et al.
patent: 3409225 (1968-11-01), Maddalozzo
patent: 4022165 (1977-05-01), Eckert
patent: 4289098 (1981-09-01), Norberg et al.
patent: 4356979 (1982-11-01), Eblen
patent: 4385609 (1983-05-01), Kato

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