A synchronizing device of the free pistons of a free piston engine having first and second opposed and alternately movable assemblies, at least one of which is a set of pistons, said synchronizing device sealed to cause the assemblies to move in different directions opposite, characterized in that the first set includes a piston connected to a shaft having at least two racks formed therein, the teeth of the racks protruding outwardly from the longitudinal axis of the shaft in opposite directions and engaging, respectively, with the teeth of a pair of pinions, the pinions being mounted to rotate in a fixed position within the engine by at least one bracket, including the second set and a second pair of racks held in fixed position with respect to each other by minus one wall member and held in fixed position with respect to said wall member, projecting the teeth of the second pair of racks inwards towards each other and engaging, respectively, with the teeth of said pinions, the normal component of the forces that are created by the mutual meshing of the racks being balanced within the wall member., the pinions and the second pair of zippers. (Machine-translation by Google Translate, not legally binding)
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