Fuel injector having directly actuatable injection valve...

Details Fuel injector having directly actuatable injection valve... Fuel injector having directly actuatable injection valve...

2011-04-19

2011-04-19

Ganey, Steven J (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Injection nozzle opened by relieving supply

C239S102200, C239S124000, C239S584000, C239S600000, C123S496000, C123S498000

Reexamination Certificate

active

07926737

ABSTRACT:
A fuel injector for an internal combustion engine is proposed having a directly actuatable injection valve element. The fuel injector has a nozzle needle, axially guided in a nozzle body, and an actuator accommodated in an injector housing. The nozzle needle is connected to a coupling piston on the nozzle-needle side and the actuator is connected to a coupling piston on the actuator side. The coupling piston on the actuator side acts on a coupling chamber and the coupling piston on the nozzle-needle side acts on a control chamber. The nozzle needle is lifted from a nozzle-needle sealing seat as a function of the pressure in the control space. An intermediate plate is provided between injector housing and nozzle body. The plate has a conduit hydraulically connecting the coupling chamber to the control chamber. The conduit contains a hydraulic throttle which has at least two sections having different cross sections of flow. The section having the smaller cross section of flow faces the coupling chamber and the section having the larger cross section of flow faces the control chamber. The throttle disclosed suppresses oscillations of the actuator in the transmission of the actuator stroke to the nozzle needle stroke.

REFERENCES:
patent: 6422210 (2002-07-01), Lambert et al.
patent: 6805302 (2004-10-01), Boecking
patent: 2002/0014540 (2002-02-01), Cooke
patent: 2003/0155540 (2003-08-01), Stoecklein et al.
patent: 10 2004 005 452 (2005-08-01), None
patent: 1 079 095 (2001-02-01), None
patent: 1 621 759 (2006-02-01), None

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