Abstract: A rotary trochoidal compressor comprising a rotor mounted for planetary motion within a housing and in which the peripheral surface of the compressor rotor is substantially a hypotrochoid and the peripheral inner surface of the housing is the outer envelope of the rotor and in which a compressible layer is provided on the inner surface of the rotor housing for sealing against the rotor peripheral surface.

Abstract: A machine for energy conversion includes a working chamber defined by two relatively movable parts and provided with inlets and outlets for the working medium, both parts having members serving as pistons and abutments which sealingly engage with the walls of the working chamber. The members serving as pistons and abutments may pass through each other and consist of a number of juxtaposed elements which laterally seal against each other and against adjacent portions of the wall of the working compartment and have variable surface area to permit passage.

Abstract: An annular sleeve is radially deformed within a cylindrical bore to provide a housing for a pump having vanes slidable through slots in an eccentric rotor, the radially opposed edges of the vanes slidably contacting the inner surface of the sleeve.

Abstract: A rotary positive fluid displacement machine wherein the radially reciprocable sealing vanes are hydraulically coupled to each other at their innermost ends for preventing the occurrence of compression opposition to radial retraction of the vanes and for urging radial outward movement of the vanes.