Patent ID: 7222601

Claim:
A rotatably two-stroke reciprocating valveless vane internal combustion engine comprising: a cylindrical casing ( 1 ), said cylindrical casing including: a double wall wherein cooling fluid is passing through; longitudinally extending walls ( 2 , 3 ) being unitary or affixed to said cylindrical casing ( 1 ); end plates or heads ( 10 & 11 ); a power output rotary hollow shaft ( 6 ) mounted within said cylindrical casing upon said end plates ( 10 & 11 ) and vanes ( 7 & 8 ); four working chambers (a, b, c & d) formed between said vanes ( 7 & 8 ) and said longitudinally extending walls ( 2 & 3 ) inside said cylindrical casing; wherein said vanes ( 7 & 8 ) are unitary or affixed to said power output rotary hollow shaft ( 6 ), and thereby alternatively rotate in back and forth fashion in such manner that the volume of said four working chambers between said vanes and the walls compresses and expands in such sequence that a two-stroke mode of the internal combustion engine operates; wherein each of said four working chambers is simultaneously operated in a stroke of intake-and-compression, and then in a reversed stroke of expulsion-and-exhaust; intake ports ( 15 ab and 15 cd ), wherein each of said intake ports is located on said end plates or heads ( 10 or 11 ) or on said cylindrical casing ( 1 ) close to said longitudinally extending walls ( 2 & 3 ) and connected via an intake tube to a membrane ( 29 ), which opens and closes said intake tube; exhaust ports ( 14 ), wherein each of said exhaust ports is connected via an exhaust tube to a ball ( 30 ) or a conical member ( 31 ), which opens and closes said exhaust tube; and spark plug(s), igniting the compressed fuel mixture at maximum compression, and firing sequentially into said working chambers at the end of a cycle.