Patent ID: 9011124
Filing Date: 2015-04-21
Classification: F04C

Abstract:
1. Enclosed positive displacement mechanism, comprising: a body defining a cylindrical cavity with an internal side surface and having at least a first and a second inlet port and at least a first and a second outlet port intended to allow a fluid to inflow into said cavity and to allow said fluid to outflow from said cavity, respectively; a rotor mounted in said body so as to be rotatable about a main or revolution axis; an orbiting piston, which is located in said cavity, is mounted on said rotor so as to be rotatable about a secondary or rotation axis eccentric with respect to said main axis and is arranged to roll on the internal side surface of said cavity; and a single vane slidable in said orbiting piston, said vane is mounted in a peripheral portion of said body located between one of said inlet ports and one of said outlet ports, contiguous to said one of the inlet ports, so as to oscillate in use, and is mounted in said body so as to pass through said orbiting piston and is guided with a free end of said vane in contact with the internal side surface of said cavity, wherein an arc-shaped sector, which delimits the oscillation of said vane and on which the free end of said vane is arranged to tangentially slide during an entire oscillation, is hollowed out of the internal side surface of said cavity.