Patent ID: 8893684

Claim:
A rotary engine, the engine comprising a stator body having walls defining an internal cavity, and a rotor body mounted for eccentric revolutions within the cavity, the rotor and stator bodies cooperating to provide rotating chambers of variable volume when the rotor moves relative to the stator, the engine comprising at least an inlet port, an exhaust port and a purge port defined in the stator body and communicating with the cavity, the inlet and outlet ports being located relative to one another such that a volumetric compression ratio of the engine is lower than a volumetric expansion ratio of the engine and such that the rotor body prevents communication between the inlet and exhaust ports through the rotating chambers in any rotor position, the inlet port and purge port being in communication with an air source, the purge port being located rearwardly of the inlet port and forwardly of the exhaust port relative to a direction of the rotor revolution, the purge port momentarily communicating with the exhaust port through each of the chambers when the rotor is positioned in a respective portion of the rotor revolution.