A two-stroke alternating internal combustion heat engine, comprising:
- a chassis assembly comprising a crankshaft mounting upper frame (10) and a crankshaft mounting lower frame (10);
- sliders (60), each slider (60) having opposite slider flanks (60v, 60u) that define a curved slide channel, each slider being stationary;
- a mobile component (61) that slides in each slider along a trajectory defined by the curved slide channel;
- a motor output shaft (11) extending coaxially with a first axis (Z), the first axis (Z) extending through the crankshaft mounting upper frame (10) and the crankshaft mounting lower frame (10);
- an elementary assembly having a center (O) located on the first axis (Z), the elementary assembly being comprised of at least three moving piston-slider-crank assemblies that are distributed at equal-distant angular intervals about the first axis (Z),
- the at least three moving piston-slider-crank assemblies including a first moving piston-slider-crank assembly, a second moving piston-slider-crank assembly, and a third moving piston-slider-crank assembly,
- each moving piston-slider-crank assembly including a piston (50), a crankshaft (40), a sealing device (75, 78), and one of the sliders (60),
- the piston (50) of each moving piston-slider-crank assembly comprising an internal cylinder face (51) having a front edge (53), the sealing device (75, 78) being located in an area of the front edge (53) of the piston (50) and providing a sliding surface area (52) during movement of the piston-slider-crank assembly,
- the internal cylinder face (51) of the piston (50) being a concave surface, the concave surface being a ruled surface, the concave surface extending in the sliding direction (w) of each moving piston-slider-crank assembly, the concave surface being curved around the center (O) of the elementary assembly,
- the internal cylinder face (51) of the piston (50) being divided into a sliding surface (48u) adjacent to a combustion section (48v),
- wherein the mobile component (61) is connected to the piston (50) at a pivot point and, during movement of each piston-slider-crank assembly, movement of the mobile component (61) and an axis of the pivot point is along the trajectory of the curved slide channel of the slider (60),
- wherein, for each moving piston-slider-crank assembly, the piston (50) is i) driven in rotation by the crankshaft (40) and ii) driven in a sliding movement by the movement of the mobile component (61) sliding along the trajectory of the curved slide channel of the slider (60),
- wherein the sliding surface area (52) provided by the seal device (75, 78) of each piston (50) of each moving piston-slider-crank assembly interlock by contact with the internal cylinder face (51) of the piston (50) to encase a volume during a cycle, the volume defining a combustion chamber (35) having a quasi-spherical shape at top dead center, the volume of the combustion chamber (35) being variable during the cycle and being a minimum volume at top dead center and at a maximum volume at bottom dead center,
- wherein the crankshaft (40) of each moving piston-slider-crank assembly extends along a different respective axis parallel to the first axis (Z), the crankshaft (40) of each moving piston-slider-crank assembly extending through both the upper frame (10) and the lower frame (10);
- a cyclic drive and orientation mechanism (30) connected to each moving piston-slider-crank assembly, each cyclic drive and orientation mechanism (30) comprising a drive shaft (39), moving in cyclic and monotone rotation, which drives and positions the piston relative to the crankshaft mounting upper frame (10) and a crankshaft mounting lower frame (10) according to a movement in a plane (P) that is perpendicular to the first axis (Z),
- wherein when the at least three moving piston-slider-crank assemblies includes exactly three moving piston-slider-crank assemblies, i) the sealing device (75, 78) of the piston of the first moving piston-slider-crank assembly slides in contact on the sliding surface (48u) of the internal cylinder face (51) of the piston of the second moving piston-slider-crank assembly, ii) the sealing device (75, 78) of the piston of the second moving piston-slider-crank assembly slides in contact on the sliding surface (48u) of the internal cylinder face (51) of the piston of the third moving piston-slider-crank assembly, and iii) the sealing device (75, 78) of the piston of the third moving piston-slider-crank assembly slides in contact on the sliding surface (48u) of the internal cylinder face (51) of the piston of the first moving piston-slider-crank assembly,
- wherein at all times in the cycle, the front edge (53) of each piston (50) crosses in an upper cap (36s) and a lower cap (36i) located on the first axis (Z) located on opposite sides of the center (O) of the elementary assembly,
- wherein at top dead center, the volume of the combustion chamber (35) is outlined by the combustion sections (48v) of the internal cylinder face (51) of the piston of the at least three moving piston-slider-crank assemblies;
- a distribution device, that handles, during the cycle, exhaust, intake and confinement of gases in the combustion chamber (35);
- and
- a synchronization device, that synchronizes, in frequency and phase, the drive shaft (39) of each cyclic drive and orientation mechanism (30).