Spool valve

Abstract

A spool valve includes: a housing including a spool hole; a spool inserted into the spool hole of the housing so as to be movable in an axial direction; a screw shaft arranged coaxially with the spool; an electric motor configured to rotate the screw shaft; a nut threadedly engaged with the screw shaft and configured to move in the axial direction when the screw shaft is rotated; a coupler through which the nut and the spool are coupled to each other; and a coil spring configured to apply biasing force to the spool, the biasing force acting so as to maintain the spool at a neutral position, the coil spring being arranged so as to overlap the nut when viewed from a radial direction of the screw shaft.

Dependencies are inferred from the claim text.