a planetary rotation machine including at least one ring channel which is curved along an at least partial arc and that contains a piston that can be moved in a fluid generating a movement . the piston can be coupled to a rotary body coaxially arranged by a lever by the rotational axis thereof . a stable structure able to transmit high torques is obtained by guiding the lever through a gap created in the wall of the ring channel in a direction of displacement of the piston , in a radial direction away from the piston in a sealed manner .