Patent ID: 6431048
Filing Date: 2002-08-13
Classification: F15B

Abstract:
A fluid pressure-driven combination actuator having an output shaft for carrying out an operation which is a combination of linear reciprocating motion and rotating swinging motion, said actuator comprising,a linear cylinder including a piston for carrying out linear reciprocating motion in a cylinder bore by operation of fluid pressure and a piston rod connected to said piston, means for restricting rotation of said piston rod, said output shaft which is disposed coaxially with said piston rod and which can move forward and rearward and can rotate, a converting mechanism provided between said piston rod and said output shaft and having a function of connecting said piston rod and said output shaft and a function of converting linear thrust of said piston rod into rotational torque to transmit said rotational torque to said output shaft, operation setting means which includes a cam groove formed in one of said output shaft and a fixed side member surrounding said output shaft and a cam follower formed in the other of said output shaft and said fixed side member and fitted into said cam groove and which applies linear motion and swinging motion to said output shaft by controlling said converting operation of said converting mechanism, and speed changing means which includes a plurality of fluid flow paths with different flow rates and which adjusts fluid pressure acting on said piston according to an operation position of said piston by switching between said flow paths according to operation of said piston to thereby make it possible to change a driving speed of said piston in a linear motion area and a swinging area of said output shaft from each other.