PISTON-FORMAT WORKING-FLUID-PRESSURE ACTUATOR AND CONTROL VALVE

摘要

[Problem] To provide a piston-format working-fluid-pressure actuator capable of commonly using components when the piston-format working-fluid-pressure actuator is used for a reverse action or a normal action and decreasing a length dimension, in the forward/backward movement direction of the output shaft and to provide a control valve using the piston-format working-fluid-pressure actuator and a valve member.;[Solution] A piston-format working-fluid-pressure actuator (10) includes a casing (30) provided with a cylinder chamber (33) by including a cover portion (31) and a body portion (32), an output shaft (40) supported by the casing so as to be movable forward or backward, a piston (50) attached to the output shaft and defining the cylinder chamber, a spring member (60) applying an elastic force of moving the output shaft to the piston, and a working-fluid supply opening (70) supplying a working fluid. The piston includes an accommodating recess (51) accommodating the spring member and is attachable to the output shaft so that an opening (52) of the accommodating recess is selectively directed toward the cover portion or the body portion.

主权项

1. A piston-format working-fluid-pressure actuator comprising:
a casing provided with a cylinder chamber by including first and second casing bodies; an output shaft supported by the casing so as to be movable forward or backward; a piston attached to the output shaft and defining the cylinder chamber; a spring member applying an elastic force of moving the output shaft to the piston; a working-fluid supply opening supplying a working fluid applying a force of moving the output shaft to the piston against the elastic force applied from the spring member; and at least one seal member sealing the leakage of the working fluid, wherein the piston includes an accommodating recess accommodating the spring member and is attachable to the output shaft so that an opening of the accommodating recess is selectively directed toward the first casing body or the second casing body, wherein the output shaft extends so as to penetrate one casing body of the first casing body and the second casing body and is connected to a subject operation member, and wherein the piston is disposed so as to establish a relation of L1=L2 when the distance L1 is a distance between a seating surface connected to the output shaft and a contact surface contacting one casing body during a reverse action and the distance L2 is a distance between a seating surface connected to the output shaft and a contact surface contacting one casing body during a normal action.