Abstract: This invention relates to an improvement in a housing formation for a rotary piston machine of trochoidal construction with an outer envelope curve and a housing corresponding to said outer envelope curve, said piston being patterned after a turning point-free trochoid n:1, and working chambers between said housing and said piston separated by radial seals in said housing,The improvement comprising that the housing has the form of an outer parallel curve to the piston contour, whereby the equidistant distance of said parallel curve corresponds at least to the greatest deviation between said piston contour and the coordinated exact outer envelope curve.

Abstract: This invention relates to an improvement in a rotary piston machine of trochoidal construction for transporting a fluid medium, having working chambers formed between a trochoidal piston and a housing corresponding to the coordinated outer envelope curve, said chambers being separated from each other by radial seals in the housing, wherein the medium is supplied through openings within the inner envelope curve in the housing side wall and in a recess in the piston and passes from the recess by way of control openings in the peripheral piston surface to the working chamber, and having outlet openings in the housing closed-off by check valves, the improvement comprisingA. the piston has the form of a saddle-free epitrochoid 1:1,B. the supply openings in the housing side wall are in the area of the radial seals,C.

Abstract: This invention relates to an improvement in a rotary piston machine comprising a jacket and two side parts forming a housing, inlet and outlet means on said housing, a piston patterned after a saddle-free epitrochoid 1:1 mounted in said housing for rotation on an eccentric shaft, annularly-closed axial seals on the sides of the piston in proximity to the piston edge, and a pair of oppositely-positioned radial seals in said housing, the improvement comprising that the axial seal on each side of the piston is composed of two seal means equidistant with respect to each other and being closed within themselves, and lubricant opening means in said side parts in proximity to at least one of said radial seals, said openings being located essentially in the interstice between said two seal means in any position of the piston, or being covered temporarily at least in part by one of said two seal means.

Abstract: This invention relates to an improvement in a rotary piston machine of trochoidal construction for compressing a gaseous medium having working chambers between a trochoidal piston and a housing corresponding to the coordinated outer envelope curve, said working chambers being separated from each other by radial seals in the housing, and outlet openings closed-off by means preventing backflow for discharging medium from the working chambers, the improvement comprising trough-shaped recess means in the peripheral piston surface which, in the dead center position of the piston, are positioned immediately ahead of a radial seal.