Abstract: The Quasiturbine (Qurbine in short) uses a rotor arrangement peripherally supported by four rolling carriages, the carriages taking the pivoting blade pressure-load of the blades forming the rotor, and transferring the load to the opposite internal contoured housing wall. The present invention discloses a central, annular, rotor support for the rotor geometry defined by the pivoting blades and associated wheel-bearings, while still maintaining the important center-free engine characteristic. The pressure-load on each pivoting blade is taken by its own set of wheel-bearings rolling on annular tracks attached to the central area of the lateral side covers forming part of the stator casing.

Abstract: The Quasiturbine (Qurbine in short) described in patent U.S. Pat. No. 6,164,263 uses a rotor arrangement peripherally supported by four rolling carriages, the carriages taking the pivoting blade pressure-load, of the blades forming the rotor, and transferring the load to the opposite contoured housing wall. For the same, similar or other applications, the present invention discloses a central, annular, rotor support for the rotor geometry defined by the pivoting blades and associated wheel-bearings, while still maintaining the important center-free engine characteristic. The pressure-load on each pivoting blade is taken either by its own set of wheel-bearings rolling on annular tracks attached to the central area of lateral side covers forming part of the casing, or is cancelled out in symmetrically pressurized fluid energy converter mode through the central holding action of annular power sleeves.

Abstract: While most rotary engines use the principle of volume variation between a curve and a moving cord of fixed length, this new engine concept uses a four degrees of freedom X, Y, .theta., .PHI. rotor, confined inside an internal housing contour, and does not require a central shaft or support. The invention is an assembly of four carriages supporting the pivots of four pivoting blades forming a variable-shape rotor. This rotor rolls just like a roller bearing on the surface of an housing internal contour wall shaped like a skating rink. During the rotation, the rotor pivoting blades align alternatively in a lozenge and a square configuration. All ports are radial in the housing and/or axial on the lateral side covers. Since the compression and expansion strokes start and end simultaneously, an ignition flame transfer slot is used to maintain a continuous combustion while four strokes are completed in every rotation.