Patent ID: 6170384
Filing Date: 2001-01-09
Classification: F03C,F15B

Abstract:
A fluid power rotary drive device comprising:a rotatably mounted output drive part, having at least one ring of teeth,a rack arranged on two juxtaposed drive pistons and being in engagement with the output drive part, the drive pistons being adapted to be oppositely moved by fluid actuation in two mutually parallel directions in order to cause a rotary movement of the output drive part between two end positions, anda position presetting device adapted to cooperate with the two drive pistons to permit presetting of an intermediate position of the output drive part, the position presetting device including an abutment unit having two abutment parts that are mechanically linked so that they move in unison with each other and are positioned adjacent to each other in an axial extension of the two drive pistons, the abutment unit being adapted to be moved in relation to the drive pistons into a positioning setting in which the two abutment parts are simultaneously in contact with the respectively associated drive piston.