Patent ID: 8297253

Claim:
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 cylindrical central portion 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 one rotational/prismatic joint, wherein the gear mechanism has a rotational element mounted rotatably on the frame by a first rotational joint, and wherein a connecting rod connected by a second rotational joint rotatably to the rotational element and by a third rotational joint rotatably to the cylinder liner and by the rotational/prismatic joint to the rotor.