Abstract: The invention concerns a radial-piston engine of rotary type of the kind having a valve system comprising apertured disc rings arranged in intersliding relationship, one of said rings being stationary while the other one is arranged to take part in the rotary motion of the rotor. The valve opening relationship is determined by the manual angular positions of the discs. In accordance with the invention, filed injection takes place via an injection nozzle positioned in the stationary disc. The valve ring is formed with a through opening which in response to the position assumed my the rotor at the moment of fuel ignition forms an open communication means between the injection nozzle and the combustion chamber.

Abstract: On the rotary drive shaft (10) of a four-stroke engine is non-rotationally mounted a hub (11) supporting four cylinders (14) wherein pistons (16) are arranged for reciprocal movement radially towards the hub. The hub (11) is provided with a combustion chamber (25) having common inlets and outlets (26, 27) formed in a valve ring (28) rotating together with the hub (11) and sealingly abutting against a stationary port ring (30) having intake and exhaust ports (36, 37) communicating with inlet and outlet channels (34, 35) arranged alternately to assume a position in registry with the inlets and outlets (26, 27) associated with the respective combustion chamber (25). One spark plug (46) for each combustion chamber (25) is arranged to rotate with the hub (11) with the spark plug electrode end projecting into the associated combustion chamber opposite the common valve ring inlets and outlets (26, 27).

Abstract: On the rotary drive shaft of a four stroke engine is non-rotationally mounted a hub supporting four cylinders wherein pistons are arranged for reciprocal movement radially towards the hub. The hub is providing with a combustion chamber having common inlets and outlets formed in a valve ring rotating together with the hub and sealingly abutting against a stationary port ring having intake and exhaust ports communicating with inlet and outlet channels arranged alternatingly to assume a position in registry with the inlets and outlets associated with the respective combustion chamber. One spark plug for each combustion chamber is arranged to rotate with the hub, with the spark plug electrode end projecting into the associated combustion chamber opposite the common valve ring inlets and outlets.