Fuel injector with boosted needle closure

Details Fuel injector with boosted needle closure Fuel injector with boosted needle closure

2007-10-15

2009-08-04

Gorman, Darren W (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

C239S092000, C239S096000, C239S533800

Reexamination Certificate

active

07568632

ABSTRACT:
Fuel injectors with boosted needle control providing controlled and rapid needle closure. Boost and drive pistons are provided for hydraulic actuation to controllably close the needle, with the boost piston reaching a mechanical stop before the needle reaches the closed position, with the drive piston alone providing adequate hydraulic force to hold the needle closed. In a preferred embodiment, fuel from the intensifier is coupled to the top of the boost and drive pistons to close the needle, and controllably coupled to the bottom of the boost and drive pistons to allow pressure in the needle chamber to open the needle. Apparatus for control of fuel pressure to the bottom of the boost and drive pistons is disclosed.

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International Search Report and Written Opinion of the International Searching Authority Dated Mar. 31, 2008, International Application No. PCT/US2007/022019.

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