RICHTUNGS-DREHSCHIEBER-LENKVENTIL

摘要

The rotary directional control valve comprises a ring mechanism which is formed in the inner peripheral surface thereof with ball fitting grooves which cooperate with the ball fitting groove or grooves of the input shaft through first balls to regulate the relative position of the ring mechanism with respect to the input shaft in a radial direction thereof and on an end surface thereof with cam surfaces which cooperate with the cam surfaces of the outer valve through second balls to restrict the rotation of the input shaft in the circumferential direction thereof with respect to the outer valve. The ring mechanism includes a ring member which is formed with the cam surfaces on one end surface thereof and rotatable in the circumferential direction with respect to the input shaft and, in addition, a fixing part for fixing the ring member to the input shaft in a condition that the input shaft is set in its prescribed angular position with respect to the outer valve. Accordingly, in the rotary directional control valve, not only the cam surfaces have the function of restricting and regulating rotation but also the neutral position of the restriction mechanism and the neutral position of the inner valve with respect to the outer valve can be exactly adjusted and attained severally, and therefore, the rotary directional control valve can be readily manufactured.