Abstract: A fluid-actuated cylinder includes a piston rod with a circumferential groove. A split ring, with predetermined linear expansion properties, is cooled to a temperature below the temperature of the rod, and the ring halves are located in the groove. The ring is then equalized with the temperature of the rod, and expands into compression against the sidewalls of the groove. An interference fit is provided with the groove, which prevents axial and rotational movement of the ring with respect to the piston rod. The expansion also prestresses the piston rod between the groove sidewalls. The split ring is then connected to an annular flange on a ring-shaped piston to fix the piston with respect to the piston rod. The piston rod assembly is then located in a cylinder housing, with the piston providing a fluid seal with the cylinder walls as the piston rod reciprocates.

Abstract: A fluid-actuated cylinder includes a piston rod with a circumferential groove. A split ring, with predetermined linear expansion properties, is cooled to a temperature below the temperature of the rod, and the ring halves are located in the groove. The ring is then equalized with the temperature of the rod, and expands into compression against the sidewalls of the groove. An interference fit is provided with the groove, which prevents axial and rotational movement of the ring with respect to the piston rod. The expansion also prestresses the piston rod between the groove sidewalls. The split ring is then connected to an annular flange on a ring-shaped piston to fix the piston with respect to the piston rod. The piston rod assembly is then located in a cylinder housing, with the piston providing a fluid seal with the cylinder walls as the piston rod reciprocates.