Abstract: A rotary piston machine having a housing defining a prismatic chamber the cross section of which forms an oval of odd order. A rotary piston is guided in the chamber and, in each position, subdivides the chamber into two working chambers. Piston-fixed instantaneous axes of rotation of the rotary piston are defined in a center plane. The rotary piston, in each interval of movement, is rotating with one of opposite nappe sections in an inner wall section about an associated instantaneous axis of rotation and is sliding with the opposite nappe section along the opposite second inner wall section of the chamber and is reaching a stop position there.

Abstract: The axis of a gear is to follow a trajectory having a salient point. To this end, the gear rolls along two stationary toothed racks. A change-over toothing is provided between these two toothed racks. This change-over toothing extends non-smoothly with respect to the toothed racks. Such change-over toothing permits the gear to roll, without jamming, from one of the toothed racks to the other one, with its axis following a trajectory having a salient point.

Abstract: The invention relates to a rotary piston machine. A housing defines a prismatic chamber the cross section of which forms an oval of odd order, which is alternatingly composed of circular arcs having a first relatively small radius of curvature and circular arcs having a second, relatively large radius of curvature, which arcs change into each other continuously and differentiably. Corresponding first and second cylindrical inner wall sections are formed. A rotary piston is guided in the chamber, the cross section of the rotary piston forming an oval the order of which is one less than the order of the chamber. Opposite cylindrical nappe sections are formed at the rotary piston, of which, in each position, a respective one is rotatable in a cylindrical inner wall section of equal radius of curvature and the respective other one engages an opposite inner wall section. The rotary piston, in each position, subdivides the chamber into two working chambers.

Abstract: The axis of a gear is to follow a trajectory having a salient point. To this end, the gear rolls along two stationary toothed racks. A change-over toothing is provided between these two toothed racks. This change-over toothing extends non-smoothly with respect to the toothed racks. Such change-over toothing permits the gear to roll, without jamming, from one of the toothed racks to the other one, with its axis following a trajectory having a salient point.