Abstract: A high speed turbo disc mounting assembly for the reduction of turbo disc failure and the provision for disc migration radially at high speeds comprising a shaft, a bushing mounted on said shaft having an annular flange through which torque pin apertures are provided, and a turbo disc mounted on said bushing such that torque pins aligned in channels at the interface of the disc and bushing provide for rotational engagement of the disc to the bushing without restricting outward migration of the disc or imparting undue stress concentrations to the high dynamic stress level area of said disc.

Abstract: A piston ring having a general shape of a cylinder with the first section in the shape of an annulus for engaging a portion of the surface of a piston to provide a fluid-tight seal with the piston and a second section in the shape of a thin-walled bowl with sealing means on the outer surface of the bowl for providing a fluid-tight seal between the ring and the cylinder wall. The ring is especially constructed for use at cryogenic temperatures of -320.degree. F and below.

Abstract: A piston ring having a general shape of a cylinder with the first section in the shape of an annulus for engaging a portion of the surface of a piston to provide a fluid-tight seal with the piston and a second section in the shape of a thin-walled bowl with sealing means on the outer surface of the bowl for providing a fluid-tight seal between the ring and the cylinder wall. The ring is especially constructed for use at cryogenic temperatures of -320.degree. F and below.BACKGROUND OF THE INVENTION1. Field of the Invention.The present invention pertains to an improved piston ring for use in reciprocating pumps, compressors, expansion engines and the like. In particular, the present invention relates to a piston ring for use with a device for producing a cryogenic refrigeration such as shown in U.S. Pat. No. 3,620,029. Cryogenic refrigeration generally relates to temperatures at minus 150.degree. F down to minus 450.degree. F.2. Description of the Prior Art.U.S. Pat. No.