Patent ID: 6314924
Filing Date: 2001-11-13
Classification: F02B,F04B

Abstract:
A method of operating a free piston internal combustion engine, comprising the steps of:providing a housing including a combustion cylinder and a second cylinder, said combustion cylinder having a bore with an inside diameter;providing a piston including a piston head reciprocally disposed within said combustion cylinder, a second head reciprocally disposed within said second cylinder, and a plunger rod interconnecting said piston head with said second head; andmoving said piston between a top dead center position and a bottom dead center position during a return stroke, said return stroke having a stroke length between said top dead center position and said bottom dead center position, said moving step being carried out with a bore/stroke ratio represented by a quotient of said inside diameter divided by said stroke length which is between 1.2 and 1.5.