Oscillating piston motor

Hydraulic or pneumatic oscillating piston motor with a housing (1), providing a shaft (2) mounted in the housing with freedom to rotate and providing an oscillating piston (3), manipulated with pressure, attached to the shaft so that it has torsional strength, shaped as a lever with two lever arms (49,8), having a different area of pressure, sealed against the inner shell surface of the housing (1) and separating two working spaces (4,5), which can be acted upon with pressure, the first of the two lever arms being designed as a hollow cylindrical bushing (49) disposed around the rotated shaft (2), the surface of a mantle portion of the bushing is covered at least over a part of its circumference by a shell seal surface (mantle sealing) (64) in the manner of a hollow cylinder, the seal surface providing tapered, rib - spaced sealing lips (75), formed to it in one piece, disposed along the circumference, uniformly distributed in the circumferential direction of the bushing (49), radially standing away and pointing away from the seal surface, the housing (1) being composed of a jointless receptacle (21) disposed around the shaft (2) in the direction of the circumference in the working area of the oscillating piston (3) and of a cap (22) covering the receptacle, and the seal surface (64) working together exclusively with a flat opposite-surface (9) disposed next to the cover (22) of the housing (1) without additional sealing, the second lever arm (8), possessing a larger radial reach and being sealed by a wing seal (65) about its periphery, which is connected in one piece with the seal surface (64) and a packing, which seals the axial surfaces of the bushing (49) against the housing, the path of the lever arms (49,8) in the housing (1) cooperate with one another in such a way, that one of the lever arms can leave its path only after the moment, in which the other lever has reached its largest deflection, the largest swing angle of the oscillating piston (3) being determinable by an adjusting device (26), comprising an adjusting disk (35) which is attached to the shaft, has torsional strength, and provides a friction lining (56) as well as comprising stops (37), chucked with a clamping surface (28) against the friction lining (56), and an indicating device (46) is correlated to the adjusting device (26), the indicating device showing the respective position of the oscillating piston (3) and comprising a scale (50) which surrounds the shaft (2) in a circular way, the scale being placed with torsional strength and resting on the cap (44), which can be stuck on the adjusting disk (35) and can cover it and the scale cooperating with an indicating organ (63) which is disposed firmly to the housing (1).