Rotary-piston engine

A rotary piston engine, comprising:

• a shape of revolution relative to a delta axis, and rotatably movable about the delta axis in relation to an envelope,
• a plurality of cavities which are shapes of revolution of a corresponding axis, distributed over a perimeter of the shape of revolution,
• a plurality of rollers each disposed in a corresponding one of the plurality of cavities, each roller of the plurality of rollers rotates about the corresponding axis and further includes at least a first face and a second face,
• wherein the first face is capable of ensuring sealing with at least one cavity of the plurality of cavities at some moments of a cycle of the engine when the first face is inside the at least one cavity and a section of each roller, as viewed in a plane perpendicular to the corresponding axis, is an arc of circle centered on the corresponding axis, with a center angle,
• a mechanical component configured to make the rotation of each roller of the plurality of rollers about the corresponding axis proportional to the relative rotation of the delta axis of the shape relative to the envelope,
• the envelope being defined by a first plurality of the plurality of rollers in their rotational motion about their corresponding axis, each driven by the shape of revolution and the relative rotation of the delta axis of the shape of revolution relative to the envelope,
• the second face ensuring sealing between each roller and the envelope,
• a section of the engine, when viewed in a plane perpendicular to the delta axis, the envelope, the shape of revolution and one of the ends of the arc of circle of the first face, are in contact, in a same location, at a particular moment of a cycle of the engine,
• side walls or a first flange and a second flange over which the shape of revolution, the roller, and the envelope bear,
• the shape, the rollers, the envelope, and the flanges, cooperatively delimiting volumes that are closed and variable at different moments of the cycle of the engine of the relative rotation of the shape of revolution relative to the envelope,
• the engine being wherein at least two cavities of the plurality of cavities are contiguous, and in that, between the at least two contiguous cavities, a passage is arranged so that, when a first end of the envelope is between the at least two contiguous cavities, a fluid that has been compressed by a first face of the first end of the envelope, can pass on a second face of the envelope.