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In the concentric rotary pressure fluid machine which can either be an engine, motor, pump or compressor, the four identical elliptical gears (54, 54, 100, 100) actuate the relative rotary motions of two identical and coaxial rotors (60, 60′) characterized by varying angular accelerations with respe

In the concentric rotary pressure fluid machine which can either be an engine, motor, pump or compressor, the four identical elliptical gears (54, 54, 100, 100) actuate the relative rotary motions of two identical and coaxial rotors (60, 60′) characterized by varying angular accelerations with respect to time equal in magnitude but opposite in direction. Consequently, the four arcuate variable-volume-chambers ( 1, 2, 3, 4) bounded by the arcuate rotor vanes (70, 70, 70′, 70′) analogous to opposed pistons of the piston-cylinder machine, and the rotor cylinders (80′), axial spacer (110), hollow cylindrical shell (20) and two transverse end plates (32, 32), functioning as cylinder block symmetrically and alternately enlarge and shrink in volumes in the prescribed manner as they revolve around their common axis.

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A concentric rotary pressure fluid machine made up of a stator, an intermediate elliptical gears and main shaft assembly, a pair of coaxial rotors and their axial spacer, a. said stator comprising a shell in the middle, a pair of identical gear box bodies in front and rear transverse sides of said s

A concentric rotary pressure fluid machine made up of a stator, an intermediate elliptical gears and main shaft assembly, a pair of coaxial rotors and their axial spacer, a. said stator comprising a shell in the middle, a pair of identical gear box bodies in front and rear transverse sides of said shell, and a pair of identical gear box cover plates at both ends, fastened together, in which: i. said shell comprises: 1) a right circular cylindrical internal surface having an axis 2) a longitudinal hole parallel to said axis 3) one or two pairs of ports located half the minimum angular space of the variable-volume-chamber above or below from the horizontal plane bisectpr of the shell to their nearest edges; ii. each gear box body comprises: 1) an outer transverse side 2) an oblong recess in said outer transverse side 3) a first longitudinal hole in said oblong recess, coaxial with its bottom semi-circular circumferential surface 4) a second longitudinal hole in said oblong recess, coaxial with its top semi-circular circumferential surface, with a gas seal and an anti-friction bearing 5) an inner transverse side 6) a cylindrical tongue in said inner transverse side having identical diameter as that of the internal surface of said shell serving as end plate of working chamber and facilitating the mounting and alignment of said shell; iii each gear box cover plate comprises: 1) an inner transverse side 2) an oblong tongue in said inner transverse side having identical transverse dimensions as the oblong recess of said gear box body facilitating its mounting and alignment 3) a longitudinal hole in said oblong tongue with oil seal and anti-friction bearing corresponding coaxially with the first longitudinal hole of said gear box body 4) a longitudinal blind hole in said oblong tongue with anti-friction bearing corresponding coaxially with the second longitudinal hole of said gear box body; b) said intermediate elliptical gears and mains shaft assembly transmitting the brake power in which: i. a main shaft passes longitudinally through said lomgitudinal hole of the sheel and said first longitudinal holes of the gear box bodies as well as journalled for rotation in the longitudinal holes of the gear box cover plates ii. a pair of identical intermediate elliptical gears are mounted and keyed to said main shaft; c. said pair of coaxial rotors and their axial spacer rotatably mounted inside the stator, each rotor comprising a pair of vanes, a rotorcyclinder, a rotor shaft and a rotor elliptical gear, in which: i. each vane comprises: 1) an outer circumferential convex surface having radius of curvature virtually equal to the internal radius of the shell, which is journalled for rotation inside the right circular cylindrical internal surface of said shell 2) an inner circumferential concave surface 3) a wedge-shaped base inwardly projecting from one side of its inner circumferential concave surface 4) a countersunk hole transversely passing through said wedge-shaped base 5) transverse surfaces 6) a groove running perpendicular to its direction of travel containing hot gases for lubrication and dynamic sealing in the inner and outer circumferential surfaces and transverse surface of said vane; ii. each rotor cylinder comprises: 1) a circumferential surface having radius of curvature virtually equal to that of said inner circumferential concave surfaces of the vane, and rotatably journalled between the inner circumferential concave surfaces of the pair of vanes screwed to the other rotor cylinder 2) a pair of diametrically opposing wedge-shaped longitudinal grooves identical in shape and size to said wedge-shaped bases of the vanes screwed to it 3) a threaded diametrical hole coaxial with the countersunk holes of the vanes screwed to it 4) an axial cylindrical recess in the inner transverse surface for journalling the axial spacer; iii. said rotor shaft outwardly and coaxially projects from said rotor cylinder and is journalled for rotation in the second longitudinal hole of the gear box body and the longitudinal blind hole of the gear box cover plate iv. said rotor elliptical gear is mounted and keyed to said rotor shaft and enmeshed with said intermediate elliptical gear inside the gear box v. said axial spacer has a disc plate serving as thrust bearing for the inner transverse surfaces of the rotor cylinders, and a pair of journals projecting outwardly and coaxially from said disc plate serving as radial bearings for the cylindrical recesses in the inner transverse surfaces of said rotor cylinders.