Rotary piston machine with a guided in an oval oval chamber rotary piston

A rotary piston machine has, in a housing (10) a prismatic chamber (12) whose cross section forms an oval. In the chamber (12) a rotary piston (22) is movable, whose cross section also forms an oval. The order of the oval of the chamber (12) is one less than the order of the oval of the rotary piston (22). The rotary piston (22) rotates alternately in successive movement sections to different rotational axes, respectively of a stop position to the next. In its rotational movement of the rotary pistons located in any position on the inner wall of the chamber (22) to form two working chambers (80, 82). The rotary piston (22) has a with an inner toothing (56) provided aperture (36), whose internal gearing (56) with a toothing arrangement for the input or output of the rotational movement into engagement. The breakthrough (36) is substantially mathematically similar to the rotary piston (22), wherein the planes of symmetry (50, 52, 54) coincide with the opening (36) with which the rotary piston (22). The gearing arrangement includes a pair of outer teeth (74, 76) provided, fixed to the housing-bearing shafts (70, 72), whose external toothing (74, 76) with the internal toothing (56) of the opening (36) are engaged, wherein in each moving section in each case a shaft (eg., 70) in the region of a portion (38) of the opening with a smaller radius of curvature and the other shaft (72) ...