Patent ID: 8534259

Claim:
A central-axis rotary piston internal combustion engine having a round cylindrical rotor housing which is closed off by a first housing cover on the output side and a second housing cover on the side opposite the output side, an external rotor which rotates at uniform speed in the rotor housing about its central axis and which supports a first rotor cover on the output side and a second rotor cover on the side opposite the output side, and an internal rotor which rotates at non-uniform speed in the interior of the external rotor about its central axis, wherein the external rotor has three external rotor pistons extending radially inwards and which are rigidly connected to one another, and the internal rotor has a corresponding number of internal rotor pistons extending radially outwards and which are rigidly connected to one another and engage between, in each case, two external rotor pistons of the external rotor so as to delimit two working chambers in each case, and wherein each working chamber is assigned a combustion chamber, and each combustion chamber communicates via a control window with fixed inlet openings and outlet openings, wherein the three external rotor pistons are arranged at equal angular intervals from one another, and wherein to implement a 6-cycle-process there are provided in at least one of the first and second housing covers, in the rotation direction of the three external rotor pistons, in succession a first inlet opening for air and fuel mixture, a first outlet opening to a gas accumulator, a second inlet opening for air and fuel mixture, a third inlet opening from the gas accumulator, and at least one second outlet opening.