Abstract: A piston system comprises a first arm and a second arm, each mounted respectively on a first shaft and a second shaft, and being mounted for rotational oscillation about a central axis. Both arms terminate radially outward from the central axis, and are coupled to piston arrangements. The piston arrangements include pistons. Each set of pistons is mounted for movement within respective stationary chambers. Each stationary chamber may be defined, at least in part, by a piston coupled to the first arm and a piston coupled to the second arm. The stationary chambers are arranged about the central axis. The first and the second shaft are connected to an energy transfer mechanism. An energy transfer mechanism includes coupled non-circular gears arranged to convert oscillatory rotational motion to unidirectional rotational motion.

Abstract: A piston system comprises a first arm and a second arm, each mounted respectively on a first shaft and a second shaft, and being mounted for rotational oscillation about a central axis. Both arms terminate radially outward from the central axis, and are coupled to piston arrangements. The piston arrangements include pistons. Each set of pistons is mounted for movement within respective stationary chambers. Each stationary chamber may be defined, at least in part, by a piston coupled to the first arm and a piston coupled to the second arm. The stationary chambers are arranged about the central axis. The first and the second shaft are connected to an energy transfer mechanism. An energy transfer mechanism includes coupled non-circular gears arranged to convert oscillatory rotational motion to unidirectional rotational motion.