Aerospatiale Societe Nationale Industrielle, Societe Anonyme

Esparbes Bernard

The invention relates to an internal-combustion engine having opposed integral annular pistons and a central shaft. The piston block (1), formed by the two pistons (2, 3) exhibits, at each axial end, an axial double skirt fitted with an outer crown (9) forming the piston head proper, and an inner crown (10) forming an admission pump with an antechamber (30) radially within the corresponding annular cylinder (5), wherein the piston head (9) delimits a combustion chamber (12). Radial pawls (22), penetrating axial ports (21) of the housing (4) and radial holes (18) of the piston block (1), have their inner radial ends engaged in sinusoidal circumferential undulated grooves (20) made in an enlarged central part (19) of the central driving shaft (8) driven in rotation by the reciprocating axial movements of the piston block (1). The admission of comburent gas and/or fuel is effected axially by the ends, through valves (29) and orifices (28) in end plates (6) closing the antechambers (30) in which slide the inner crowns (10, 10a) fitted with flaps (11) to function as an admission pump. Application to an internal-combustion engine, of this type is for use to particularly equip aircraft.

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Hautes-Pyrenees, France

Esparbes Bernard