Fuel pumping apparatus

Details Fuel pumping apparatus Fuel pumping apparatus

1977-03-03

1978-09-05

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123139AF, 1375121, F02M 6300

Patent

active

041111737

ABSTRACT:
A fuel pumping apparatus includes an injection pump to which fuel is supplied by means of a feed pump. A valve is provided to control the output pressure of the feed pump and a pressure responsive piston responsive to the output pressure of the feed pump modifies the timing of delivery of fuel by the injection pump. The valve comprises first and second valve elements which are resiliently loaded in one direction. The first valve element is exposed to the output pressure of the feed pump and is movable by this pressure to allow fuel to flow through an orifice. The second valve element is subjected to the pressure upstream of the orifice and is movable firstly to reduce the force acting on the first valve element due to the resilient loading and after moving a predetermined distance progressively opens a spill port. The second valve element is larger than the first valve element and the effect is that initially the output pressure of the feed pump increases with increasing engine speed and then with further increase of speed falls but then with still further increase in engine speed starts to rise.

REFERENCES:
patent: 3308799 (1967-03-01), Bessiere
patent: 3967644 (1976-07-01), St. Laurent
patent: 4038956 (1977-08-01), Perr et al.

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