Patent ID: 6364282
Filing Date: 2002-04-02
Classification: F02M

Abstract:
An actuation fluid control valve for a hydraulically actuated fuel injector, comprising:a valve body including a bore having a bore axis and a bore wall, an actuation control cavity, a low pressure actuation fluid drain, an actuation fluid inlet for admitting high pressure actuation fluid to the bore from outside the fuel injector, an inlet seat at a border between the actuation control cavity and the bore, and a drain seat at a border between the actuation control cavity and the actuation fluid drain; an actuator attached with the valve body; and an actuation valve member slidably disposed in the bore, the actuation valve member having an inlet pin surface partially defining a fluid entry chamber within the bore, the actuation valve member being slidable in response to the actuator between: a first position in which the actuation control cavity is open to the actuation fluid inlet via the fluid entry chamber and the actuation valve member is being held against the drain seat such that the actuation control cavity is fluidly isolated from the actuation fluid drain; and a second position in which the actuation control cavity is open to the actuation fluid drain and the actuation valve member is being held against the inlet seat such that the actuation control cavity is fluidly isolated from the actuation fluid inlet.