Abstract: A six-phase thermodynamic cycle for a rotary internal combustion engine. The thermodynamic cycle comprising: Phase 1 (intake) air enters the central intake chamber and mixes with recirculated exhaust gas from phase 3; Phase 2 (low compression) the air and recirculated exhaust gas from phase 1 is compressed at a low compression ratio; Phase 3 (scavenge and recirculation) a portion of air and recirculated exhaust gas from phase 2 scavenges the combustion chamber and partially scavenges the expansion chamber; Phase 4 (high compression) the intake chamber separates to form a compression chamber and the residual combined exhaust gas and air from phase 2 is compressed at a high compression ratio into the combustion chamber; Phase 5 (power phase) an expansion chamber is formed, originating from the static combustion chamber and torque is produced to turn the output shaft; and Phase 6 (exhaust) exhaust gas from phase 5 is discharged.

Abstract: The present invention refers to a spark ignition engine of the rotary type with a double rotation center, comprising a stator (A) with a stator central body (A1) having a compartment (1, 2), a first side cover (A2) and a second side cover (A3), wherein the compartment includes an expansion compartment (1) and a compression compartment (2) and a combustion chamber at an upper portion of the compartment (1, 2), a rotor (B) with an expansion rotating element (B1), a compressing rotating element (B2) and a hinging linear element (B3) interposed between said expansion rotating element (B1) and the compression rotating element (B2), the rotor is arranged in the compartment (1, 2) of the stator central body, wherein the expansion compartment (1) comprises a concave inner surface (1a) and the compression compartment (2) comprises a convex inner surface (2a).