Abstract: A rotary actuator including a tube. A piston disposed in the tube and configured for displacement there along. The piston having a spline extending radially outwardly therefrom formed by plurality of grooves and a plurality of non-grooved portions. At least some of the non-grooved portions of the spume defining a passageway extending radially inwardly through a side of the piston. An axle rod disposed in the piston and having a second spline. A set of pins each positioned through a passageway through the piston to engage the second spline.

Abstract: A rotary actuator includes a tube having first and second hydraulic ports formed separated a predetermined distance from each other and through which oil enters and is exhausted and at least two tube through holes penetrating a side surface of the tube, an end cap coupled to the tube and having a first flange fixed to a predetermined first platform, an axle rod including a second flange portion disposed at one side of the tube and fixed to a predetermined second platform to be rotated, a slant groove rod disposed in one portion of the tube and having at least two first slant grooves formed inclined on an outer circumferential surface, and an axle rod disposed in the other portion of the tube and sliding coupled to the end cap, a piston including a piston head disposed between the tube and the axle rod and a slant groove body disposed between the tube and the slant groove rod, wherein at least two second slant grooves are formed on an outer circumferential surface of the slant groove body to be opposite to the

Abstract: A wiper linkage for a car supporting left and right wiper rotation shafts, the wiper linkage including a body having a plate rod shape in which an upper surface is flat and shaft holes are formed at both end portions, and a shaft rotation support portion rotatably supporting using bearings encompassing the rotation shaft so that the wiper rotation shaft freely rotates and fixed by being inserted in the shaft hole of the body. The operational performance of the wiper is improved and the manufacturing work can be automated so that productivity can be improved. Since the body has a plate shape, when the motor is installed, the accommodation surface is flat so that the motor can be firmly fixed without using an additional sub-bracket. Accordingly, the number of parts decreases so that the manufacturing cost can be reduced.