Rotary piston engine

A rotary piston engine comprising:

• a frame,
• a cylinder liner mounted on a cylinder shaft rotatably in the frame,
• wedge-shaped ribs extending from an inner wall of the cylinder liner and being opposite to one another,
• a rotor mounted on a stub shaft coaxially in the cylinder liner, and
• a gear mechanism connecting the frame, the cylinder liner and the rotor,
• wherein the gear mechanism is positioned outside a working space arranged between the cylinder liner with the rotor and the wedge-shaped ribs, and the gear mechanism couples on an outer circumference of the cylinder liner and the rotor so that the rotor periodically leads and lags relative to the cylinder liner,
• wherein the gear mechanism and the outer circumference of the cylinder liner form with the rotor a transmission with five rotational joints with a degree of freedom of 1 and two gearwheel transmissions,
• wherein the gear mechanism has a rotary disc mounted rotatably on the frame by a first rotational joint,
• wherein a connecting rod connected rotatably by a second rotational joint to the rotary disc and rotatably by a third rotational joint to the outer circumference of the cylinder liner,
• wherein a first gearwheel is non-rotatably connected to the stub shaft,
• wherein a second gearwheel is non-rotatably connected on a gudgeon extending from a center of the rotary disc, and
• wherein at least one intermediate gearwheel is meshed with the first gearwheel and the second gearwheel.