The rotary-piston engine is an internal combustion
engine that has planetary movement of the rotor-piston.
Rotary-piston engines have a gas-exchange region
located at the edge of the elliptical rotary-piston and
pursue the zones of pressure changes. This feature
allows for maximum gas exchange, fuel efficiency and
reduced toxicity in the exhaust of the engine. The
engine consists of a synchronized stator, rotor, and
eccentric axis, which can reduce the displacement of the
interference gap between the rotor and the eccentric
axis. This feature also helps reduce shock loads in the
gear system. This engine design can be used as both a
hydraulic pump and hydraulic motor which cannot be
accomplished with the Wankel Rotary Engine