초록 ▼

An actuation valve for a hydraulically-operated fuel injector includes an actuator having a plunger and a spool valve coupled to the plunger. The spool valve includes a high pressure port and is operable by the actuator to selectively place the high pressure port or the low pressure port in fluid co

An actuation valve for a hydraulically-operated fuel injector includes an actuator having a plunger and a spool valve coupled to the plunger. The spool valve includes a high pressure port and is operable by the actuator to selectively place the high pressure port or the low pressure port in fluid communication with an injection mechanism of the injector.

대표청구항 ▼

In combination: an actuation valve for a hydraulically-operated fuel injector having an injection mechanism, comprising an actuator having a plunger and a spool valve coupled to the plunger and having a high pressure port and a low pressure port and operable by the actuator to selectively place the

In combination: an actuation valve for a hydraulically-operated fuel injector having an injection mechanism, comprising an actuator having a plunger and a spool valve coupled to the plunger and having a high pressure port and a low pressure port and operable by the actuator to selectively place the high pressure port or the low pressure port in fluid communication with the injection mechanism, the spool valve including a body having a valve bore, a spool disposed in the valve bore and coupled to the plunger, a first passage coupled between the valve bore and the high pressure port, a second passage coupled between valve bore and the low pressure port and a third passage coupled between the valve bore and the injection mechanism wherein the spool is alternately and repetitively movable during normal operation of the actuation valve between a first position when the actuator is actuated and a second position when the actuator is deactuated; and a high pressure fluid source coupled to the high pressure port and a low pressure fluid source coupled to the low pressure port; wherein the spool valve further includes a spring and means operable in cooperation with the spring for hydraulically assisting movement of the spool each time the spool moves from the first position to the second position.