High pressure fuel injector with cushioned plunger stop

Details High pressure fuel injector with cushioned plunger stop High pressure fuel injector with cushioned plunger stop

1992-09-16

1994-04-05

Merritt, Karen B.

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

Plunger interconnected or mounted valve

239 95, 123467, F02M 6120

Patent

active

052997383

ABSTRACT:
An improved high pressure fuel injector for internal combustion engines of the type having a plunger assembly, with a plurality of plungers, that is mounted within a central bore within the body of the fuel injector for reciprocal movement, the plunger assembly having an upper plunger and a lower plunger mounted for reciprocal motion within the central bore and a variable volume injection chamber in said lower end of the central bore between the injection orifice and a bottom end of the lower plunger. In accordance with a preferred embodiment, the problem of large quantities of air being drawn into the injector from the combustion chamber during the retraction stroke injection stroke is avoided by limiting the return stroke of the lower plunger to a distance that is significantly less than that of the stroke of the upper plunger of the plunger assembly. Furthermore, a cushioned stopping of the return movement of the lower plunger is obtained and the injector is also able to allow different maximum injectable charge capabilities to be produced from the same basic set of components without requiring more than the return spring assembly and injector nozzle to be changed.

REFERENCES:
patent: 3831846 (1974-08-01), Perr et al.
patent: 4149506 (1979-04-01), Muntean et al.
patent: 4471909 (1984-09-01), Perr
patent: 4721247 (1988-01-01), Perr
patent: 4986472 (1991-01-01), Warlick et al.
patent: 5040727 (1991-08-01), Muntean et al.
patent: 5076240 (1991-12-01), Perr

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