Patent ID: 7631632

Claim:
An engine or a pump comprising: at least one toroidal cylinder, two impellers with radial vanes rotatably mounted in said toroidal cylinder with said impellers cooperating with said toroidal cylinder to define working chambers between adjacent vanes, each of said impellers including to one side thereof at least one rotary valve element which rotates with each of said impellers and selectively opens and closes passages in a cylinder housing to said working chambers for in letting and exhausting a working media; said rotary valve elements cooperating with said cylinder housing such that the position of each of said rotary valve elements defines media flow through said engine or pump, and wherein each of said rotary valve elements includes two outwardly extending lobes that cooperate with a valve portion of said cylinder housing, said lobes closing ports in said cylinder housing to said working chambers as a function of the angular position of said valve elements.