Electrically operated gas flow regulating valve

Abstract

An electrically operated gas flow regulating valve in which a needle valve body () is moved axially through a motion conversion mechanism () by the rotation of an electric motor (). The motion conversion mechanism () includes: a guide tube () in which is formed axially elongated slits () with which cam pins () fixed to the needle valve () are slidably engaged; and a tubular cam body () having a spiral cam part with which the cam pins () are engages through elongated slits (). In an arrangement in which one of the guide tube () and the cam body (), e.g., the guide tube (), is rotated by the electric motor (), hysteresis is restrained from occurring. The cam part disposed in the cam body () is constituted by a spirally inclined sides () with which the cam pins () are brought into contact from axial one direction. A spring member () is disposed so as to urge the cam pins () in the other of the axial directions toward the spirally inclined sides ().