Two-cycle jet ignition engine with prechamber in piston

A two-cycle internal combustion engine including means defining a closed end cylinder, a piston reciprocably movable in said cylinder and defining therewith a combustion chamber adjacent said cylinder closed end and variable in volume from a minimum to a maximum upon movement of said piston from top dead center to bottom dead center positions, respectively, a prechamber formed within said piston and connected to said combustion chamber by a restricted passage through the end of said piston, said prechamber being open on one side through a cylinder engaging wall of said piston, exhaust means through said cylinder and open to said combustion chamber near its maximum volume to permit removal of exhaust products from said chamber, first inlet means through said cylinder and open to said combustion chamber near its maximum volume to admit a fresh gas charge directly to said combustion chamber, second inlet means through said cylinder and positioned such that upon movement of said piston to its bottom dead center position, said prechamber communicates through its open side with said second inlet means for supplying a rich charge of air-fuel mixture to said prechamber, and ignition means mounted in said cylinder and positioned such that upon movement of said piston to its top dead center position, said prechamber communicates with said ignition means, for ignition of said prechamber charge, combustion of which causes expulsion of burning gases through said restricted passage to said combustion chamber and consequent ignition and burning of the gas charge in said combustion chamber.