Patent ID: 7987823

Claim:
A rotary machine comprising: a) a stationary elliptical cam housing; b) an intake port for delivering fluids; c) an exhaust port for discharging said fluids; d) a rotor; wherein said rotor comprises at least one cylinder which is bisected by a connected rotor shaft perpendicular to at least one side axis of the cylinder to allow rotation; wherein said at least one cylinder comprises two opposed pistons sharing a common chamber; and wherein said stationary elliptical cam housing includes centrally positioned bearings on each side to support a rotational movement of said rotor and a circumscribed interior of the stationary elliptical cam housing acting as a cam to provide a rigid support for thrust from the rotor; e) at least one rotary valve provided on said bearing to control said intake port and said exhaust port through an aperture in the rotor shaft; and f) piston rods connecting the pistons to respective cam followers which pivot on shafts positioned opposite each other on the rotor; wherein said cam followers transfer piston motion to said stationary elliptical cam housing; and wherein said cam followers pivot around rotor pins and cause said pistons to reciprocate as the rotor is caused to rotate in two complete pumping cycles with a single rotation of the connected rotor shaft, which provided four pumping strokes.