Electronic unit injectors

Details Electronic unit injectors Electronic unit injectors

2008-08-29

2010-12-14

Tran, Len (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

C239S533140, C239S533200, C239S533700, C239S088000, C239S585100

Reexamination Certificate

active

07850099

ABSTRACT:
An electronic unit injector comprising a spray tip including a valve seat, a needle valve arranged to close on the seat to prevent discharge of fuel from the spray tip or to open off the seat to dispense fuel from the spray tip, a spring biasing the needle valve to a closed position, a spring seat between the spring and the needle valve, the needle valve overcoming the biasing force when the pressure reaches a predetermined level, the spring and seat being disposed in a cage having port areas circumferentially arranged about said spring and spring seat to supply low pressure fuel to the area occupied by said spring and spring seat to reduce the risk of cavitation in said spring cage.

REFERENCES:
patent: 5937520 (1999-08-01), Earhart et al.
patent: 5992768 (1999-11-01), Beatty et al.
patent: 6543706 (2003-04-01), Hutchings et al.
patent: 6811092 (2004-11-01), Cowden
patent: 7044400 (2006-05-01), Luedicke
patent: 7124966 (2006-10-01), Schlairet

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