Patent ID: 7264454

Claim:
A rotary combustion engine comprising: a peripheral housing describing an epitrochoidal orbit having a long axis and a short axis; a front housing plate; a rear housing plate; an eccentric shaft mounted for rotation in a rotational direction; a triangular piston mounted for rotation on said eccentric shaft between said housing plates, said piston having side faces facing respective said plates and three tips which contact said epitrochoidal orbit to form three working spaces which pass successively through a combustion phase; three arcuate strips on each of said side faces sealing said piston against each of said front and rear housing plates, said arcuate strips, during rotation, passing over an area on each plate which is bounded radially on the inside by an envelope curve; a piston seal sealing each face of said piston against the eccentric shaft; and a gas passageway which guides leakage gas leaking around the arc shaped strips during the combustion phase radially inward along the front and rear housing plates and through the plates to respective vent channels.