Patent ID: 6244226
Filing Date: 2001-06-12
Classification: F01B,F02B

Abstract:
A free piston internal combustion engine, comprising:a housing including a combustion cylinder, a second cylinder, and a fluid port disposed in communication with said second cylinder for transporting a pressurized fluid into said second cylinder; anda piston within said housing which is movable between a top dead center position and a bottom dead center position, said piston including:a piston head reciprocally disposed within said combustion cylinder;a second head reciprocally disposed within said second cylinder;a plunger rod with a first end attached to said piston head and a second end attached to said second head; anda flow impingement device adjacent said plunger rod and attached to at least one of said plunger rod and said second head, said flow impingement device including a smooth, substantially annular portion and a plurality of vanes which cause said piston to rotate upon movement of said piston toward said top dead center position, said substantially annular portion being positioned between said second head and said plurality of vanes.