Patent ID: 7469673

Claim:
A rotary-piston engine with at least two two-armed rotary pistons ( 6 , 7 ; 19 ) being located in an essentially spherical housing ( 1 ) and rotating in common about a rotational axis ( 8 ) running through the center of the housing, each rotary piston comprising two pistons ( 13 - 16 ; 29 , 30 ) in the form of piston arms being interconnected in a fixed manner and lying essentially diametrically opposite to each other with respect to the center of the housing and, during their rotation, the rotary pistons executing pivoting displacements back and forth in opposite directions about a pivoting axis ( 9 ) running perpendicular to the rotational axis ( 8 ), whereby guide members engaging into at least one guide groove ( 26 ; 32 ) designed in the housing ( 1 ) for controlling the pivoting movements are mounted on at least two pistons ( 13 - 16 ; 29 , 30 ), characterized in that the guide members are embodied as loose rotational bodies ( 27 , 28 ), in that each of the at least two pistons ( 13 - 16 ) are embodied with a guide pan ( 25 , 31 ) for receiving one half of one of the rotational bodies ( 27 , 28 ) and in that the respective guide pan ( 25 ; 31 ) is connected to a supply channel for a pressurized lubricating fluid embodied in the piston ( 13 - 16 ; 29 , 30 ) via a bore ( 34 ) discharging into its base region, whereby either the rotational bodies ( 27 ) are embodied in a spherical manner, the respective guide pan ( 25 ) is embodied in an essentially hemispherical manner, and the guide groove ( 26 ) is embodied with an essentially semi-circular profile, or the rotational bodies ( 28 ) are embodied in an ellipsoidal manner, the respective guide pan ( 31 ) is embodied in an essentially semi-ellipsoidal manner, and the guide groove ( 32 ) is embodied with an essentially semi-elliptical profile.