Reduced trapped volume

Details Reduced trapped volume Reduced trapped volume

1990-04-25

1991-08-06

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

F02M 4702

Patent

active

050370316

ABSTRACT:
The present invention is directed to open nozzle type unit fuel injectors, and more specifically to an improved lower plunger and cup design of an open nozzle unit injector to minimize trapped volume and reduce unburned hydrocarbons in vehicle emissions. The lower plunger includes at least a major and a minor diameter sections with the minor diameter section extending within a bore of said cup at least partially between the fully advanced and retracted positions of the plunger. Moreover, the labyrinth flow area between the cup bore and the minor diameter section of the plunger is designed to reduce the trapped volume of fuel that results in the advanced plunger position while reducing sensitivity to fuel metering in the retracted plunger position. In one embodiment, the cup bore and minor diameter section are stepped. In another, both the bore and the minor diameter section are tapered. In yet another embodiment, only the cup bore is modified.

REFERENCES:
patent: 3836080 (1974-09-01), Butterfield et al.
patent: 4213568 (1980-07-01), Hofmann
patent: 4280659 (1981-07-01), Gaal et al.
patent: 4523719 (1985-06-01), Hofmann
patent: 4601086 (1986-07-01), Gerlach

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