High pressure fuel injector with fuel drainage valve

Details High pressure fuel injector with fuel drainage valve High pressure fuel injector with fuel drainage valve

1993-07-26

1994-06-14

Merritt, Karen B.

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

Plunger interconnected or mounted bypass

239 95, 123446, F02M 5500

Patent

active

053202783

ABSTRACT:
An improved high pressure fuel injector for internal combustion engines in which problems of hysteresis delays and fuel leakage at the commencement of the metering process can be avoided without affecting the ability to precisely control the fuel supply pressure by the provision of a way for the metering and injection plunger to be acted upon only by the pressure of the incoming fuel supply. An improved metering and injection plunger spring arrangement provides a valving of the drain path that prevents leakage through drain passages and/or about the metering and injection plunger during the fuel metering and injection phases. Also, a double check valve arrangement is incorporated into the plunger seat disc to minimize the possibility of back-flow leakage of fuel during injection of the fuel from the metering and injection chamber.

REFERENCES:
patent: 4463901 (1984-08-01), Perr et al.
patent: 4699320 (1987-10-01), Sisson et al.

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