Patent ID: 7828537

Claim:
A rotary engine, comprising in combination: a housing having at least one inlet valve and at least one outlet valve; at least one chamber coupled to said housing and to said at least one inlet valve; a generally cylindrical driveshaft extending through said housing; and a rotor that is rotationally mounted in said housing on said driveshaft, wherein said rotor comprises a plurality of recessed portions situated radially along a peripheral surface of said rotor, said plurality of recessed portions for receiving a plurality of spheres, said plurality of spheres being rotationally engaged between an inner surface of said housing and the peripheral surface of said rotor, and wherein each of said plurality of spheres remains in a corresponding one of said plurality of recessed portions while said rotor rotates within said housing, wherein said housing comprises a servicing knob, wherein said servicing knob is threaded onto said housing, wherein when said servicing knob is removed, a resulting opening in said housing is used to remove one or more of said plurality of spheres for servicing.