(57) A three-phase internal combustion engine, in particular for portable devices such
as power chain saws, brush cutters, hedge trimmers, blowers, atomizers, etc., characterised
by comprising an engine block (2) in which there is provided at least one cylindrical
seat (6) for the reciprocating movement of a piston rigid with a connecting rod-crank
unit, the mixture entry ports (20) and the mixture transfer channels opening into
said seat, said seat also comprising a combustion chamber provided with a valve (34)
for the exit of exhaust gas, said valve being operated by the rotation of a shaft
(16) rigid with the crank (14).
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