Hydraulic control valve and fuel injector using same

Details Hydraulic control valve and fuel injector using same Hydraulic control valve and fuel injector using same

2005-01-11

2005-01-11

Evans, Robin O. (Department: 3742)

Fluid sprinkling, spraying, and diffusing

Including valve means in flow line

Reciprocating

C239S088000, C239S090000, C239S091000, C239S092000, C239S095000, C239S102100, C239S102200, C239S124000, C239S585500

Reexamination Certificate

active

06840466

ABSTRACT:
A hydraulic control valve for a fuel injector for an automotive engine, which includes a piezoelectric actuator and a hydraulic valve mechanism. The hydraulic valve mechanism converts a mechanical deformation of the piezoelectric actuator produced as a result of application of a voltage into a hydraulic pressure to move a valve member for opening and closing a fluid port. The hydraulic valve mechanism is so designed that the piezoelectric actuator produces a maximum output force which works to develop the hydraulic pressure when opening the fluid port through the valve member and decreases after the fluid port is opened and which is set smaller than one-half of a maximum possible output force of the piezoelectric actuator under application of a maximum working voltage to said piezoelectric actuator, thereby ensuring a maximum movement of the valve member at high energy efficiency under application of the voltage within a working voltage range.

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