COMBUSTION CHAMBER FOR AN INTERNAL-COMBUSTION ENGINE

摘要

A controlled pressure combustion chamber for a reciprocating engine. The engine includes a main cylinder and a main reciprocating piston. In the cyliner head is a second cylinder which opens to the first cylinder. A free piston in the second cylinder in shiftable in the second cylinder to absorb energy upon displacement of the main piston in the main cylinder due to compression and combustion. A pneumatic cushion is defined behind the free piston in its second cylinder and pressure in the pneumatic cushion adjusts displacement of the free piston. The free piston includes a projection which abuts an abutment in the second cylinder and motion of the free piston is damped. Valves in the second cylinder maintain the desired pressure in the pneumatic cushion.