Pivot motor has pressure equalization between working chambers provided via pressure equalization channel formed by groove between motor shaft and concentric sleeve

摘要

The pivot motor has a cylinder (3) filled with a pressure medium and provided with at least one rib (13) on its inside wall (1), enclosing a motor shaft fitted with at least one rotor vane (15) which pivots within the cylinder. At least 2 annular spaces between the cylinder and the motor have a sealing device for sealing a working chamber (17,19), with communication between the working chambers via a pressure equalization channel (45) provided by an axial groove in the surface of a sleeve (35) concentric to the motor shaft or in the surface of the motor shaft.