PROPORTIONAL SOLENOID CONTROL VALVE

摘要

Provided is a configuration in which: a spool driven by an electromagnetic proportional solenoid is urged by a spool-returning spring configured to exert urging force in an opposite direction to a driving direction of the electromagnetic proportional solenoid; a mechanical stopper is disposed at the stroke end of the spool; current dither causes a control current to micro-vibrate, the control current driving the electromagnetic proportional solenoid; and the mechanical stopper includes a stopper-urging spring configured to allow the spool to vibrate owing to the current dither even when the spool is in contact with the mechanical stopper. A proportional solenoid control valve with this configuration is capable of reducing hysteresis at the stroke end of the spool by means of the current dither, and controlling the spool in a stable manner over the entire control range including the stroke end of the spool.

主权项

1. A proportional solenoid control valve including: a driver including a driving member driven by an applied current to the driver; a movable component moved by the driving member; a valve body including a sliding hole formed therein, the sliding hole allowing the movable component to move therein; and a return spring configured to urge the movable component in an opposite direction to a driving direction of the driving member, the proportional solenoid control valve being configured to cause, by current dither, the applied current to the driver to micro-vibrate,
the proportional solenoid control valve comprising a mechanical stopper configured to limit displacement of the driving member or the movable component, wherein the mechanical stopper includes a resilient member configured to allow the driving member or the movable component to vibrate owing to the current dither when the driving member or the movable component is in contact with the mechanical stopper.