Abstract: A rotary combustion engine comprising a housing having an inner trochoidal surface and a rotor mounted within the housing and having apex portions having sealing cooperation with said trochoidal surface to form a plurality of working chambers therebetween and in which said trochoidal surface is modified at least in the region at the ends of its minor axis by displacing said surface outwardly in this region to avoid the usual crest in each of these regions and further in which the rotor periphery is modified so that it is substantially the inner envelope of this modified trochoidal surface.

Abstract: A rotary device of the type having an oblong chamber and a rotating rotor therein. Arcuate vanes are slidably mounted in the rotor so as to rotate therewith and concurrently slide relative thereto such that the ends of the vanes constantly engage the walls of the oblong chamber. The chamber walls, viewed axially in cross-section, comprise a pair of straight sides and a pair of curved ends. The curvature of these ends is derived mathematically from a square, the sides of which square form the said straight sides of the chamber walls.

Abstract: A screw compressor apparatus in which the rotors have equal pitch circle diameters, and addendum and dedendum of equal radius.

Abstract: In a fluid power converter, such as a hydraulic pump or motor, having a rotor and stator with vanes in both the rotor and stator, the improvement in the vanes which are generally rectangular in cross section in which the outer edges of the vanes have a convex curvature of an extent to prevent the sides of the vanes of the rotor and stator from locking on one another upon rotation. However, the curvature is limited to avoid undesirable detenting as the rotor vanes cross the stator vanes. In addition, the maximum slope of the convex curvature is equal to or exceeds the maximum slope of the peripheral surface on the rotor or stator with which the vanes coact to prevent having sharp corners on the vanes which would engage the stator and rotor peripheries and produce rapid wearing of the vanes as well as the peripheries of the stator and rotor which they contact.

Abstract: A rotary piston engine has a plurality of explosion chambers situated around the periphery of the housing and includes within the housing a piston. According to the preferred embodiment, a housing having H recesses would contain a piston having P = H-1 lobes. According to the preferred embodiment, the structure of the housing relative to the piston, and vice-versa, has been improved to give optimum results. The relationship between the housing and the piston is such that it may be characterized by an optimum mathematical relationship which can make the construction of such machinery simpler than has been heretofore known. Additionally, the relationship between the improved piston and housing configuration is related to other engine parameters such as the compression ratio and efficiency.

Abstract: The present invention refers to a machine with rotary articulated pistons, which work within a cylindrical chamber. The machine could equally be a motor, compressor or pump to achieve transformations of energy.

Abstract: An eccentric rotary vane device useful either as an engine or a pump. The rotary device has a conventional main chamber, an inlet port and an outlet port communicating with the main chamber, a plurality of angularly related radial vanes, independently pivotable and rotatable about a vane axis within the main chamber. A rotor is eccentrically mounted with respect to the main chamber, and a power delivery shaft is connected with the rotor. Cylindrical vane guides in the form of a single roller or sets of two rollers engage the faces of adjacent vanes on either side so that the vane guides are maintained in substantially uniform engagement with the lateral faces of the vanes as they traverse radially inwardly and outwardly therealong during rotation of the rotor. The vanes have novel configurations on their lateral faces so that substantially a perfect seal is maintained between the vane guides and the lateral faces of the vanes when single rollers are employed as the vane guides and the number of vanes is odd.

Abstract: This invention relates to an improvement in a casing for a rotary piston engine of trochoidal construction with an outer envelope curve, in which radial sealing strips are mounted in the casing between the individual working chambers, the improvement comprising that the working chamber delimitation between the radial sealing strips constituting the casing is formed by a circular arc approaching the extent of the exact envelope curve, whose center is positioned on the axis of symmetry of the respective working chamber.