Patent ID: 6164250
Filing Date: 2000-12-26
Classification: F02B,F02F,F05C

Abstract:
A free piston internal combustion engine, comprising:a combustion cylinder having an inside surface; anda piston reciprocally disposed within said combustion cylinder, said piston including a piston head and a plunger rod, said plunger rod attached to said piston head and having a longitudinal axis, said piston head including a non-metallic cap and a metallic skirt, said cap having an outside surface lying closely adjacent to and defining a bearing surface with said inside surface of said combustion cylinder, said cap being substantially immovably attached to said skirt in a direction parallel to said longitudinal axis of said plunger rod, and movably attached to said skirt in a radial direction relative to said longitudinal axis of said plunger rod.