Electro-pressure conversion control device

Claim 1

An electro-pressure conversion control device comprising: a fluid passage formed in a device body, said fluid passage including a fluid inlet at one end, a throttle, a jetting hole at the other end, and a control pressure taking port provided between said throttle and said jetting hole; and a plate having two ends and a length extending from a fulcrum at its one end to its other end which extends over the jetting hole, said one end being connected to the device body, said plate being disposed with its length in a direction perpendicular to a longitudinal axis of said jetting hole so that said other end of said plate is adjacent to said jetting hole, said plate being driven by an electrical actuator in such a manner as to pass across the longitudinal axis of said jetting hole thereby opening an closing said jetting hole, whereby said jetting hole operates as a variable throttle, said plate being displaced in a direction perpendicular to the axis of said jetting hole and substantially perpendicular to the direction of disposition of the length of the plate as it moves by operation of said electrical actuator, with said one end of said plate as a fulcrum to control the degree of opening of said jetting hole, said electrical actuator being a piezo-electric ceramic bimorph element, the pressure in the fluid passage between said throttle and said jetting hole varying according to an electrical signal applied to said electrical actuator.