Rotary piston internal combustion engines

Claim 1

Rotary piston internal combustion engine comprising, a casing whose inner peripheral wall is adapted to bear at least one spark plug and has a trochoidal inner surface and a rotary piston with a plurality of crests, the surface of said piston defining hollows on its perimeter, the volume of said hollows contributing to determining the compression ratio of the engine, and said piston defining inside said casing, by its crests in contact with said inner surface, combustion chambers of variable volume, said peripheral wall of the casing defining also a turbulence chamber in the form of a pocket in said wall, said pocket communicating through a large unobstructed opening so-positioned in a zone of said inner surface with said combustion chambers that on the passage of a crest of the piston in said zone, there is substantial equality between the pressures of the chambers separated by the latter said crest, the volume of each hollow of the piston being reduced (with respect to an engine of the same geometry without turbulence chamber) by a value substantially equal to the volume of the turbulence chamber for a given compression ratio and means for arranging said spark plug in said turbulence chamber, said spark plug being timed to fire when the piston is in such a position that said turbulence chamber is in communication with a said combustion chamber under compression and is isolated from the preceding combustion chamber, whereby through cooperation of the timing of said spark plug with the passage of said hollows past the turbulence chamber more rapid and complete combustion of the fuel mixture in the turbulence chamber and combustion chamber under compression is obtained.