Abstract: A rotary fluid pump-motor includes first and second rotor assemblies and a bent cylinder sleeve. The first rotor assembly includes a first rotor, a piston cylinder, and a flange ring with an inclined guide surface. The second rotor assembly includes a second rotor and a piston. The first and second rotors are rotatably movable about inclined first and second rotor axes, respectively. The bent cylinder sleeve receives the piston cylinder and the piston therein through respective sleeve openings to define a piston chamber therebetween. The bent cylinder sleeve is in at least intermittent contacting relationship with the flange ring's inclined guide surface and rotatably movable about the first rotor axis with respect to the inclined guide surface such that the bent cylinder sleeve moves along the first rotor axis relative to the piston cylinder based upon its circumferential position along the inclined guide surface to correspondingly vary the piston chamber's volume.

Abstract: A split rotary seal ring is cut from an integral workpiece by forming a kerf which is inclined at a constant angle with respect to axial faces of the workpiece, thereby cutting the workpiece into two mating seal ring segments. The kerf is shaped to provide a 360.degree. radial interlock between the two seal ring segments. The two segments are then moved axially with respect to one another to close the kerf, and one or both of the axial faces are then finished to provide the seal faces of the seal ring. This geometry and method result in a seal ring in which neither the inner nor outer cylindrical surfaces must be refinished after the original one piece workpiece has been split into the two seal ring segments.