Abstract: Rotary displacement machines are known for their uses as compressors, expansion engines and the like. Many comprise two or more rotors mounted for simultaneous rotation within a casing, with intermeshing or interengagement of lobes and pits as surface features of the rotors, thereby to handle a working fluid. Disclosed herein are rotary displacement machines with improved structures and rotor configurations.

Abstract: A rotary engine includes a casing having a large circular boring, a small circular boring, whereby the small circular boring interconnects with the large circular boring. A piston rotor is carried in a rotating manner within the large circular boring in the casing. A power head, ported to pass exhaust gases thru it's hollow center shaft, is carried in a rotating manner within the small circular boring in the casing. The piston rotor and the power head are meshed together to properly rotate during operation, with the piston rotor rotating counterclockwise and the power head rotating clockwise. A second powerhead can also be used.

Abstract: A fluid transfer engine employs a case with a cylindrical inner wall having an operating radius extending from a case axis. A main rotor is carried within the case and incorporates a lobe with a major radius equal to and concentric with the operating radius of the case, the main rotor having a minor radius defining a body. Two peripheral rotors are diametrically opposed with respect to the case axis and rotate within rotor chambers extending from the case. Each peripheral rotor has a radius equal to the minor radius and a center of rotation located at twice the minor radius from the case axis. Each of the peripheral rotors rotates in uniform circular motion with the main rotor in sealing contact with the body and incorporates a sculpted recess for receiving the lobe of the main rotor.

Abstract: A multi-rotor internal combustion engine has a plurality of rotary internal combustion units axially distributed along an engine axis. Each unit has a rotor mounted on an eccentric portion of the shaft inside a housing. The housings of adjacent rotary internal combustion units have different angular positions about the engine axis so as to angularly offset the housing from adjacent housings, which may provide for a more uniform temperature distribution around the housings and may also or instead allow optimising of the balancing of pressure induced side loads on the shaft of the rotors.

Abstract: A planetary engine includes a charge compression system for compressing a charge of air and/or an air and fuel mixture that is precompressed by rotation of the rotors and supplied into a combustion chamber through a rotary valve that may be actively adjusted during operation of the engine to vary the intake valve opening size and/or timing. Exhaust valves may likewise be actively adjustable rotary valves for further engine control. A compression insert mounted between the end wall assemblies absorbs combustion forces and provides rigidity to the engine, as well as occupies all or nearly all of the volume between the rotors at the minimum volume of the combustion chamber to improve the compression ratio of the engine.

Abstract: A fluid transfer engine employs a case with a cylindrical inner wall having an operating radius extending from a case axis. A main rotor is carried within the case and incorporates a lobe with a major radius equal to and concentric with the operating radius of the case, the main rotor having a minor radius defining a body. Two peripheral rotors are diametrically opposed with respect to the case axis and rotate within rotor chambers extending from the case. Each peripheral rotor has a radius equal to the minor radius and a center of rotation located at twice the minor radius from the case axis. Each of the peripheral rotors rotates in uniform circular motion with the main rotor in sealing contact with the body and incorporates a sculpted recess for receiving the lobe of the main rotor.

Abstract: A rotary expansible chamber device includes intersecting, two-piece vanes that provide expansion/compression chambers as the vanes rotate about a central axis of a rotor housing. The rotor housing has an inner contour defined by a conchoid of rhodonea having a shape coefficient of at least 3. The vanes are captured by a primary and secondary output shaft, with engagement arms of the primary output shaft being juxtaposed between the intersecting vanes. A vane spring helps maintain each vane at a constant length and in sealing engagement with the inner contour of the rotor housing.

Abstract: A rotary modulation engine enabling modulation of rotary pistons' rotational speeds is introduced. The rotary modulation engine utilizes four elliptical gears to drive two rotors that overlap each other with rotary pistons thereon alternating one another and rotating in the same direction. The elliptical gears also modulate the relative rotational speeds of these rotary pistons to thereby complete compression, power, exhaust and intake strokes four times in one revolution of a power output shaft of the engine. The rotary modulation engine with the above arrangements has smaller volume and improved efficiency as compared to the conventional four-stroke engine that requires two revolutions of the engine's crankshaft to complete four strokes. The rotary modulation engine can be applied to cars, ships, power generators and the like, and has reduced number of parts, volume and manufacturing cost while provides effectively upgraded operation efficiency.

Abstract: An apparatus for facilitating combustion in a rotary engine with planetary rotors orbiting inside a housing containing a main rotor. In various embodiments, the planetary rotor has a multi-faceted face that engages a bridge during the transition from the compression cycle to the combustion cycle with the bridge and face forming a dynamic seal; the planetary rotor has a face engaging a bridge during the transition from the compression cycle to the combustion cycle such that the bridge and face have a gap that allows gas flow from the trailing volume to the leading volume and the gap is sufficiently small to quench flame propagation from the leading volume to the trailing volume; and/or the face of the planetary rotor opposite a fuel injector has a pocket that allows the fuel cloud to expand without impinging or wetting the face of the planetary rotor.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed or rotating outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Circumferentially expandable projections from the outer housing and rotor mesh with each other to define variable volume chambers.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Projections from the fixed outer housing and rotor mesh with each other to define variable volume chambers. In another energy transfer machine, in which the outer housing may be fixed or rotating, projections of the rotor are expandable within cylinders defined by projections of the outer housing.

Abstract: A rotary internal combustion engine having multiple intermeshing rotors. Six radial lobes and six radial voids on the uniform rotors intermesh to form sealed volumes that are then compressed as the rotors rotate. The sealed volume is compressed into bevel chambers formed between the intermeshing rotors, and fuel injectors are positioned to inject fuel when the volume is under maximum compression and to maximize combustion. The combustion products are then exhausted as the rotors continue to rotate. An external supercharger compresses air prior to its introduction into the engine to increase the compression ratio. The supercharger also communicates pressurized air into the radial voids after exhaustion to purge any remaining combustion products.

Abstract: The problems of prior compressor structures relying upon conventional check valves are obviated by using, instead, flow control passages which operate to control flow while avoiding mechanical moving elements which may become problematical.

Abstract: Radial impulse engine, pump, and compressor systems are disclosed herein. In one embodiment of the invention, an engine includes a first end wall portion spaced apart from a second end wall portion to at least partially define a combustion chamber therebetween. In this embodiment, the engine further includes a plurality of movable wall portions disposed between the first and second end wall portions. Each movable wall portion includes a cylindrical surface extending at least partially between a distal edge portion and a pivot axis. Upon ignition in the combustion chamber, the distal edge portion of each movable wall portion slides across the cylindrical surface of the adjacent movable wall portion as the movable wall portions pivot outwardly in unison about their respective pivot axes.

Abstract: An apparatus for an aspiration plate for a rotary internal combustion engine. The engine has three rotating members that orbit about the center of a three-armed rotor as the rotor rotates within a housing with three lobes. The tips of the rotating members engage the lobes and a circular cutout in the rotor as the rotor rotates. A back, or aspiration, plate includes inlet and exhaust ports that are sequentially opened and closed by the rotating members and rotor as they move within the housing. A front plate rotates with the rotor and separates the combustion chambers from a planetary gear assembly that ensures the alignment of the rotating members as they orbit the rotor shaft. Fuel is injected after the compression cycle is initiated.

Abstract: An internal combustion engine of two perpendicular, toroidal cylinders intersecting at two junctions with each cylinder containing one piston filling half of its volume. The pistons are 180 degrees out of phase; each alternately occluding one intersection or the other. Each piston completes a full power, exhaust, intake, and compression stroke in one revolution. Endplates of 45 degrees allow the combustion chamber junction to be permanently filled and sealed at all times; first by one piston, then by the tips of both pistons as the complementary-angled endplates tangentially slide past one another, and then by the other piston. Compressed gases are shunted into the crossing cylinder's combustion chamber. Both pistons orbit continuously, one-way. Airflow is also one-way. Each piston is mounted to a sealed, 360-degree, counterbalanced ring gear. One ring gear is positioned centrally and the other peripherally to prevent interference. These maintain coordination between the pistons and provide output.

Abstract: Methods and apparatuses are disclosed that create variable volume chambers. A method includes synchronizing rotation of a plurality of geometrical elements to create a first chamber with the plurality of the geometrical elements and a housing. A continuous portion of the first chamber, defined by the plurality of geometrical elements, permits a volume of the first chamber to be varied. An apparatus includes a first chamber disposed between a plurality of geometrical elements and a housing. The plurality of geometrical elements are configured for synchronized rotation within the housing and a continuous portion of the first chamber, defined by the plurality geometrical elements, permits a volume of the first chamber to be varied. A plurality of chambers can be formed with a plurality of geometrical elements configured for synchronized rotation within a housing.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Projections from the fixed outer housing and rotor mesh with each other to define variable volume chambers. In another energy transfer machine, in which the outer housing may be fixed or rotating, projections of the rotor are expandable within cylinders defined by projections of the outer housing.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed or rotating outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Circumferentially expandable projections from the outer housing and rotor mesh with each other to define variable volume chambers.

Abstract: An asymmetric complete-expansion thermodynamic engine cycle is provided by an engine which compresses an air/fuel mixture to a given ratio, ignites and combusts the mixture, and expands the products through a power stroke to a volume substantially larger than the compression volume before being vented and purged to the atmosphere. This cycle is performed by a non-axisymmetric main rotor revolving within a cylindrical housing. Sealing means associated with the main rotor provide for the varied compression and expansion volumes. The cylindrical housing also contains means for air intake, fuel injection, venting, and spent gas exhaust porting.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Projections from the fixed outer housing and rotor mesh with each other to define variable volume chambers. In another energy transfer machine, in which the outer housing may be fixed or rotating, projections of the rotor are expandable within cylinders defined by projections of the outer housing.

Abstract: This rotary internal combustion engine has two rotatable vane type pistons mounted for axial rotation in a sealed casing. In an exemplary cycle, one piston is released to rotate at or prior to initiating combustion in the combustion space between the two pistons, while the other remains fixed. As the free piston rotates around to the position where the fixed piston is located, it drives exhaust from a prior cycle out of an exhaust outlet and then compresses air towards the combustion space. The roles of the pistons are reversed on the next cycle. Two units may be operated in tandem so that the power stroke of one unit provides power to help finalize the cycle of the other. Hydrogen is used as a preferred fuel, and water preferably serves as a lubricant.

Abstract: An apparatus for a rotary internal combustion engine. The engine has three rotating members that orbit about the center of a three-armed rotor as the rotor rotates within a housing with three lobes. The tips of the rotating members engage the lobes and a circular cutout in the rotor as the rotor rotates. A back plate includes inlet and exhaust ports that are sequentially opened and closed by the rotating members and rotor as they move within the housing. A front plate rotates with the rotor and separates the combustion chambers from a planetary gear assembly that ensures the alignment of the rotating members as they orbit the rotor shaft. Fuel is injected after the compression cycle is initiated.

Abstract: An energy transfer machine, for example, a positive displacement internal combustion device, has a fixed outer housing, an internal rotating carrier and one or more inner rotors with rotational axes which are offset from the inner rotor carrier rotational axis. Projections from the fixed outer housing and rotor mesh with each other to define variable volume chambers. In another energy transfer machine, in which the outer housing may be fixed or rotating, projections of the rotor are expandable within cylinders defined by projections of the outer housing.

Abstract: This rotary engine is made up of three parallel encased rotors; a male rotor, flanked by a female compression/combustion rotor, and a female separation rotor, all three coupled for synchronous rotation. The male rotor has lobes projecting from it, which mesh with complementary cavities in the female rotors during rotation. These cavities have hollows so that as the lobes mesh with them a combustion chamber is formed in the compression/combustion rotor cavities and compression zones formed in the separation rotor cavities. A passage connecting the lobe and combustion chamber provides more opportunity to convert combustion energy into rotational mechanical energy. The separation rotor serves as a pump and separates intake from exhaust gases. Passages connecting the compression zone to the combustion chamber, and that to the exhaust port, help purge residual combusted gases from the combustion chamber.

Abstract: An internal combustion rotary engine includes a housing having an inlet and an outlet and a rotatable rotor centrally mounted within the housing. The rotor includes a plurality of pockets located about its circumference, the rotor further being connected to a rotor shaft. A rotatable elliptical body is disposed in each of the plurality of pockets. Each rotatable elliptical body is coupled to respective planet gears and each respective planet gear is meshed with a centrally disposed fixed sun gear. An ignition source is disposed in each of the plurality of pockets for igniting a fuel/air mixture. During operation of the internal combustion rotary engine, for each 360° rotation of the rotor, each elliptical body rotates through 720°.

Abstract: The rotary piston power system includes a housing having a drum and a cover rotatably mounted on the drum. The drum has high pressure and low pressure ports defined in its peripheral wall and a central separator wall having arcuate end faces and a pair of semicylindrical recesses defined in opposing sidewalls. A pair of pistons are rotatably mounted on axles on opposite sides of the separator wall and fit closely between the separator wall and the peripheral wall. Each piston has a plurality of radially disposed cylindrical recesses defining slots in the piston's peripheral wall. The cover has a plurality of radially disposed vanes extending into the drum defining a number of cylinders or chambers double the number of recesses defined in a single piston. An input/output shaft extends from the opposite side of the cover for coupling to a prime mover or to a load.

Abstract: A device to convert energy having exterior and interior rotors where the number of legs (?) of an interior rotor divided by the number of chambers (X) defined by the fins of the outer rotor is equal to the effective radius of the inner reference circle ri divided by the effective radius of the outer reference circle ro (i.e. ?/X=ri/ro). Where the surface of the fins of the outer rotor and the toe and heel portion of the interior rotor allow for a sealed chamber for a finite amount of rotation of the inner and outer rotors.

Abstract: The invention relates to propulsion engineering and particularly to internal-combustion engines. The problem solved by the present invention is improving fuel efficiency and ecological compatibility, as well as providing the ability to set advance ignition at higher rotation, increasing the rotation frequency of the working shaft and decreasing its vibration, thus making the manufacture of such engines more cost effective. This problem is solved by the operational rotor being oval-shaped when viewed in cross-section, whilst the compression rotor being square-shaped when viewed in cross-section.

Abstract: An apparatus for a rotary internal combustion engine. The engine has three rotating members that orbit about the center of a three-armed rotor as the rotor rotates within a housing with three lobes. The tips of the rotating members engage the lobes and a circular cutout in the rotor (1002) as the rotor rotates. A back plate includes inlet and exhaust ports that are sequentially opened and closed by the rotating members and rotor as they move within the housing. A front plate rotates with the rotor and separates the combustion chambers from a planetary gear assembly that ensures the alignment of the rotating members as they orbit the rotor shaft. Fuel is injected after the compression cycle is initiated.

Abstract: An engine including a housing formed with a pair of side-by-side intersecting substantially cylindrical cavities, and a pair of counter-rotating power rotors rotatably mounted within the cavities. The pair of power rotors include intermeshing lobes that each define open ended combustion chambers.

Abstract: A thermodynamic cycle for an internal combustion rotary engine is disclosed which achieves high efficiency through an asymmetry between the volume of air charge before compression and the volume of expanded air at the completion of expansion. The expanded volume is ideally selected such that the pressure of the exhaust gases is near the ambient pressure of the intake air. Three embodiments of engines which utilize the cycle are disclosed, one with the major components operating in uniform circular motion, one which utilizes lobe valves, and one which utilizes three sets of lobe valves such that three charges of air at various stages in the cycle are in the engine, thus increasing the power density of the engine.

Abstract: Rotor having a pair of parallel side surfaces and a cured perimeter surface therebetween formed of contiguous mutually tangential curves each including a major portion defining a first major arc subtending a predetermined angle at a predetermined center of rotation, and having a first radius; a minor portion defining a first minor arc subtending a predetermined angle at the center of rotation, and having a second, shorter radius, the major and minor arcs arranged along an axis of symmetry; and intervening curves extending tangentially between major and minor arcs, each formed of a second major arc and a second minor arc, of predetermined radii; the curved perimeter shaped for coplanar, non-touching, and same-directional rotation with another identical rotor, and having mutually parallel orientations at the start of rotation and rotated at the same angular velocity, and separated from the curved perimeter of the other rotor by a predetermined fixed distance.

Abstract: An apparatus for a rotary internal combustion engine. The engine has three rotating members that orbit about the center of a three-armed rotor as the rotor rotates within a housing with three lobes. The tips of the rotating members engage the lobes and a circular cutout in the rotor (1002) as the rotor rotates. A back plate includes inlet and exhaust ports that are sequentially opened and closed by the rotating members and rotor as they move within the housing. A front plate rotates with the rotor and separates the combustion chambers from a planetary gear assembly that ensures the alignment of the rotating members as they orbit the rotor shaft. Fuel is injected after the compression cycle is initiated.

Abstract: An internal combustion engine including a housing, an intake port defined in the housing, an exhaust port defined in the housing, and a generally cylindrical combustion chamber defined in the housing. The combustion chamber communicates with the intake port and the exhaust port and a combustion geroter is received by and rotatable within the combustion chamber. During operation, the combustion geroter receives a fuel mixture, compresses the fuel mixture, combusts the fuel mixture, and discharges the combusted fuel mixture to the exhaust port.

Abstract: At least two rotors are mounted in a chamber and rotate synchronously to compress and/or transport fluid. The chamber has the shape of partially overlapping circles with each circle intersecting the center of the adjacent circle. The rotors are non-eccentric and have curved sides with the same radius as the circles. In exemplary embodiments, the rotors are trochoidal and the chamber is epitrochoidal. Also provided are compressors, pumps, actuators, and engines incorporating the rotary machine.

Abstract: A non-reciprocating engine comprising a hollow cylindrical shaft driver (13) located in a cylindrical stator cavity (14) of a stator. A number of expansion chambers (43) form between the outer wall of the shaft driver, the stator wall and movable dividers (25) which extend from the stator to bear on the shaft driver. The expansion chambers expand and contract during operation of the engine. An output shaft passes centrally through the stator cavity and shaft driver and has offset bearings (34) which bear on the inside surface of the shaft driver. Inlet ports in a removable inlet end plate of the stator allow pressurised air or air/fuel mixture, for example, to be introduced into the expansion chambers. Sequential expansion and contraction of the chambers around the circumference of the shaft driver causes a combination of orbital and rotational movement of the shaft driver and consequential rotation of the output shaft.

Abstract: The future of the piston engine in surface vehicles is uncertain.

Abstract: A method of thermal cycle applied to a combustion engine utilizing a first, second, and third stroke. The first stroke is an intake stroke where intake products are introduced into the combustion engine and are not compressed. The second stroke is a power stroke where the uncompressed intake products are ignited to produce combustive products. The third stroke is an exhaust stroke where the combustive products are exhausted from the combustion engine.

Abstract: A rotor for use with a rotary machine, and a rotary machine incorporating such, the rotor having a pair of parallel side surfaces, and a curved perimeter surface formed therebetween formed of a plurality of contiguous mutually tangential curved portions including include a major portion defining a first major arc subtending a predetermined angle at a predetermined center of rotation, and having a first radius; a minor portion defining a first minor arc subtending a predetermined angle at the predetermined center of rotation, and having a second radius, shorter than the first radius, the major and minor arcs being arranged along an axis of symmetry; and a pair of similar, intervening curved portions extending tangentially between major and minor arcs, each of the pairs formed of a second major arc and a second minor arc, of predetermined radii; the curved perimeter surface shaped such that when mounted for coplanar, non-touching, and same-directional rotation with another rotor of identical construction, and h

Abstract: The invention relates to propulsion engineering and particularly to methods of operation of rotary internal-combustion engines and their structures.

Abstract: A rotary machine having a housing with rotary components disclosed within. The rotary machine is configurable as an internal combustion rotary engine, an external combustion rotary engine, a gas compressor, a vacuum pump, a liquid pump, a drive turbine, or a drive turbine for expandable gases or pressurized liquids. The combustion engine employs a new thermal cycle—eliminating the Otto cycle's internal compression of the combustion products as part of the cycle. The new combustion thermal cycle is intake, expansion and exhaust.

Abstract: A modified spiral internal combustion engine is disclosed having a cylindrical housing, an intake end and a combustion end. A central shaft to which at least 2 spirals are attached is interposed through the housing. Fuel mixture enters the housing through an intake port and travels along the spirals toward the combustion end. The rotation of each of the spirals forms a sealed combustion chamber in the combustion end of the housing as they pass over the indentation in the end plate, which has the ignition devise. Ignition of the fuel within the chamber exerts a force on the combustion chamber portion of the spiral causing the central shaft to rotate. The rotation of the central shaft causes the combustion chamber portions of each spiral to individually pass by an exhaust port in the housing after they have ignited, allowing the spent gases to escape.

Abstract: A rotary machine having a housing with rotary components disclosed within. The rotary machine is configurable as an internal combustion rotary engine, an external combustion rotary engine, a gas compressor, a vacuum pump, a liquid pump, a drive turbine, or a drive turbine for expandable gases or pressurized liquids. The combustion engine employs a new thermal cycle—eliminating the Otto cycle's internal compression of the combustion products as part of the cycle. The new combustion thermal cycle is intake, expansion and exhaust.

Abstract: A rotary internal combustion engine has a housing and a working wheel mounted rotatably in the housing. At least one working piston is provided on the working wheel for taking in and compressing air or a fuel-air mixture and for converting gas pressure resulting from combustion of the fuel-air mixture into mechanical energy. A counter wheel with a working piston recess is provided. A combustion chamber for combusting a fuel-air mixture is formed in operation continuously anew between working piston, working wheel, counter wheel, and housing. First air vanes form spokes of the working wheel and take in the fuel-air mixture or the air through the working wheel for pre-compression of air or of a fuel-air mixture. The wheel is pulley-shaped and has an annular channel extending in a circumferential direction. The working piston is arranged fixedly in the annular channel.

Abstract: A rotary machine having a housing with rotary components disclosed within. The rotary machine is configurable as an internal combustion rotary engine, an external combustion rotary engine, a gas compressor, a vacuum pump, a liquid pump, a drive turbine, or a drive turbine for expandable gases or pressurized liquids. The combustion engine employs a new thermal cycle—eliminating the Otto cycle's internal compression of the combustion products as part of the cycle. The new combustion thermal cycle is intake, expansion and exhaust.

Abstract: A rotary gear device comprises a housing a preferably multiple pairs of rotatable meshing gears in coaxial relation defining spaced teeth which extend helically in the direction of the axis of each gear. First chambers are formed by the meshing gears which move substantially longitudinally while shrinking in size to substantially zero volume as they rotate toward a dead center plane. Second chambers are formed between the spaced teeth rotating away from the dead center plane and increasing in volume. Various improvements are provided to this type of device, which maybe used as an internal combustion engine, a pump or as a chemical reactor.

Abstract: A guided rotor compressor that contains at least three hollow rollers, each of which has a sheath surrounding a core. The coefficient of friction of the sheath and the core is from about 0.01 to about 0.15, but the coefficient of friction of the core is at least 1.2 times as great as the coefficient of friction of the sheath. The core has a cross-sectional area that is at least about 1.5 times as great as the cross-sectional area of the said sheath. Each of the core and the sheath has a coefficient of thermal expansion of from about 1×10−5 to about 20×10−5. Each of the core and the sheath has a a notch Izod impact strength of from about 50 Joule-meters to about 100 Joule-meters.

Abstract: A rotary internal combustion engine has a housing and a working wheel mounted rotatably in the housing. At least one working piston is provided on the working wheel for taking in and compressing air or a fuel-air mixture and for converting gas pressure resulting from combustion of the fuel-air mixture into mechanical energy. A counter wheel with a working piston recess is provided. A combustion chamber for combusting a fuel-air mixture is formed in operation continuously anew between working piston, working wheel, counter wheel, and housing. First air vanes form spokes of the working wheel and take in the fuel-air mixture or the air through the working wheel for pre-compression of air or of a fuel-air mixture. The wheel is pulley-shaped and has an annular channel extending in a circumferential direction. The working piston is arranged fixedly in the annular channel.

Abstract: A rotary machine in which plural, non-cylindrical rotors are provided for rotation within partially overlapping cylindrical bores, formed within a machine housing. Each rotor each said rotor has a curved outer surface formed of a plurality of contiguous mutually tangential curved portions.* The rotors are eccentrically mounted for synchronized, same directional rotation, within their respective bores, and each is arranged to alternately provide intake and exhaustion of working gaseous fluids, such that each rotor is continually either admitting or exhausting a working gas. The machine is constructed such that the rotors are cylindrical, each being of internally balanced form. The rotors do not touch each other or any portion of the machine casing at any time, while being positioned so as to define minimal gaps therebetween. A high rotational speed may be developed, thereby obviating the need for seals entirely, and thus further increasing the available speed, and thus the work efficiency of the machine.