Patent ID: 7234924

Claim:
A rotary combustion engine having at least one working unit, each working unit comprising: a peripheral housing describing an epitrochoidal orbit; a front housing plate; a rear housing plate; an eccentric shaft mounted for rotation, said shaft having an interior space for receiving lubricating oil from an oil tank and an eccentric in said housing between said front and rear plates; a front sealing part fixed to the eccentric between the eccentric and the front housing plate; a rear sealing part fixed to the eccentric between the eccentric and the rear housing plate; a first main bearing, a second main bearing, and an eccentric bearing on said shaft, said bearings receiving lubricating oil from said interior space; a triangular piston mounted for rotation on said eccentric bearing, said piston having three tips which contact said epitrochoidal orbit to form three working spaces which pass through, in succession, a four-phase cycle; and wherein each of said front sealing part, said rear sealing part, and said piston has a conical surface for conveying lubricating oil from said bearings axially through said working unit in response to rotation of the eccentric and the piston, said front sealing part having a conical inside surface with a diameter which increases toward the rear housing plate.