Fuel injector with isolated spring chamber

Details Fuel injector with isolated spring chamber Fuel injector with isolated spring chamber

1998-03-26

2000-02-29

Weldon, Kevin

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

239127, 2395338, F02M 4702

Patent

active

060299029

ABSTRACT:
An improved unit fuel injector is provided which effectively and precisely controls the timing of fuel injection by avoiding outside influences acting on a timing plunger. The unit fuel injector includes a timing plunger positioned between upper and lower plungers, a timing chamber positioned between the timing plunger and upper plunger and a spring chamber positioned between the timing plunger and a metering chamber for containing one or more springs for biasing the plungers. A spring chamber drain valve device is provided for directing fuel in the spring chamber to a low pressure drain while isolating the spring chamber from the low pressure drain system thereby preventing pressure variations in the drain system from entering the spring chamber and acting on the timing plunger. In addition, a scavenge circuit is provided to direct a scavenging flow of fuel and combustion gas from the injector directly to the low pressure drain without communication with the spring chamber. Consequently, pressure variations in the spring chamber are minimized thereby reducing the variations in biasing force on the timing plunger 38 to permit precise control of the timing fluid metering into the timing chamber by simply varying the timing fluid pressure.

REFERENCES:
patent: 4531672 (1985-07-01), Smith
patent: 4721247 (1988-01-01), Perr
patent: 5033442 (1991-07-01), Perr et al.
patent: 5042445 (1991-08-01), Peters et al.
patent: 5076236 (1991-12-01), Yu et al.
patent: 5275337 (1994-01-01), Kolarik et al.
patent: 5299738 (1994-04-01), Genter et al.
patent: 5320278 (1994-06-01), Kolarik et al.
patent: 5441027 (1995-08-01), Buchanon et al.
patent: 5611317 (1997-03-01), Peters et al.

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