Gas fueled rotary engine

Claim 1

A rotary combustion engine comprising: a. an outer body having a peripheral wall and axially-spaced side walls defining an internal cavity therebetween and also having first and second intake ports and an exhaust port with the inner surface of said peripheral wall having a multi-lobe profile; b. a shaft coaxial with said outer body cavity and having an eccentric portion; c. an inner body of generally polygonal profile journaled on said eccentric portion for relative rotation within said outer body, the apex portions of said inner body having sealing cooperation with said multi-lobe surface to define a plurality of working chambers which vary in volume in response to said relative rotation and the communication of said ports with said chambers being controlled by said relative rotation; d. a first passage for supplying a gaseous-type fuel at an above atmospheric pressure through said first intake port to said working chambers; e. a second passage for supplying only air through said second intake port to said working chambers; and f. said two intake ports being so shaped and positioned that the second port opens to a working chamber before the first port and closes after the first port and in which said first intake port opens to a working chamber after the exhaust port is closed to that chamber.