Heat engine, method of control of the rotational speed in a heat engine, and method of design of a cam profile for a heat engine

A heat engine comprising:

• a body provided with an annular cavity therein;
• two coaxial discoidal sectors that jointly define at least four chambers in the annular cavity;
• a mechanism of control of the rotational speed of the two discoidal sectors that makes their respective rotational speeds to vary cyclically and in antiphase between a maximum speed and a minimum speed, so that the volume of the chambers varies too;
• said speed control mechanism comprising a linked structure provided with four links arranged in a deformable parallelogram that is parallel to the discoidal sectors, said links being connected to each other by corresponding rotary joints located at their ends, and each link comprising a roller located adjacent one end thereof;
• the speed control mechanism further comprising at least one cam profile along which the rollers of the links can roll, the cam profile extending in parallel to the discoidal sectors;
• wherein:
• the shape of the cam profile is the locus of the path followed by the rollers when the discoidal sectors follow a determined motion, said determined motion being such that the speed of each discoidal sector is kept at a substantial maximum for at least 90% of the duration of a half-cycle, and is kept at a substantial minimum for at least 90% of the duration of the other half-cycle.