Solenoid operated unit injector having distinct timing, metering

Details Solenoid operated unit injector having distinct timing, metering Solenoid operated unit injector having distinct timing, metering

1983-05-13

1985-07-30

Nase, Jeffrey V.

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

Accumulator plunger biased to discharge fluid

239 95, 123446, F02M 4702

Patent

active

045316724

ABSTRACT:
A cam-operated, electronically controlled, unit fuel injector (2) including an injector body (4) containing a fluid timing circuit (20) and a fluid metering circuit (22) communicating with an injector cavity (14) within which is mounted a reciprocating plunger (16,76,78) operated by an injector cam (12) which causes the plunger (16,76,78) to experience first and second dwells during each injector cycle wherein fluid may flow in the timing circuit (20) but may not flow in the metering circuit (22) during the first dwell and may flow in the metering circuit (22) but may not flow in the timing circuit (20) during the second dwell and wherein a solenoid valve (44) is opened during the first dwell to control timing and is closed during the second dwell to control metering. Injector plunger (16) includes an inner plunger section (76) and an outer plunger section (78) mounted for independent reciprocal movement within the injector cavity (14) to define an injector chamber (80) adjacent the inner end of the injector cavity (14) and a variable volume timing chamber (90) between the inner and outer plunger sections. The timing chamber is filled with fuel during the first dwell to subsequent form a hydraulic link of variable effective length dependent upon the time of solenoid valve opening during the first dwell.

REFERENCES:
patent: 3029737 (1962-04-01), Bessiere
patent: 3465737 (1969-09-01), Dreisin
patent: 3709639 (1973-01-01), Suda et al.
patent: 4129253 (1978-12-01), Bader, Jr. et al.
patent: 4235374 (1980-11-01), Walter et al.
patent: 4281792 (1981-08-01), Sisson et al.
patent: 4327693 (1982-05-01), Busser
patent: 4378774 (1983-04-01), Kato
patent: 4402456 (1983-09-01), Schneider
patent: 4418867 (1983-12-01), Sisson

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