Abstract: A pistonless rotary motor for air compressor includes a triangular rotor rotatably disposed in a rotor cavity of a housing. The housing further includes two opposite, radially spaced first grooves in the peripheral wall and two opposite, radially spaced second grooves in the peripheral wall. The first groove is proximate the intake and the second groove is proximate the exhaust. The first grooves are disposed at a top dead center of the rotor relative to the rotor cavity and configured to release air having a first pressure when the rotor revolves eccentrically. The second grooves are disposed the top dead center of the rotor relative to the rotor cavity when the rotor revolves eccentrically and configured to release air having a second pressure which is less than the first pressure.

Abstract: A self adjusting variable pitch aircraft propeller assembly includes a mount, hub assembly and propeller. The mount has a threaded shaft and a slot. The hub assembly has a front hub and a rear hub, both the front hub and the rear hub have a hole for passage of the shaft. The propeller seats within the hub assembly and selectively rotates automatically in the hub assembly and the RPM of the engine increases and decreases. The propeller has a pin that is coupled to a sled in a slot of the mount. A spring and a nut are configured to be coupled around the threaded shaft with the spring between the hub assembly and the nut. The hub assembly is configured to translate along the mount in accordance with a speed of rotation of the hub assembly.

Abstract: A method of designing a supercharger that yields a high isometric efficiency based on a fixed pressure ratio, a plurality of rotor leads and a plurality of rotor operating speeds is provided. An efficiency map is generated of rotor lead versus rotor operating speeds for the fixed pressure ratio. A rotor lead value is determined based on the fixed pressure ratio and rotor speed combination from the efficiency map that yields a high isometric efficiency. A supercharger is provided having the determined rotor lead and that is configured to operate with the fixed pressure ratio and the determined rotor operating speed.

Abstract: A cylinder head (3) is formed with a pre-chamber (12) surrounded by a thin pre-chamber wall (11) sticking out from the inside wall surface of the cylinder head (3) to the inside of a main combustion chamber (5). Inside the pre-chamber (12), the electrode of a spark plug (15) is arranged. When the spark plug (15) is used to burn the air-fuel mixture inside the pre-chamber (12), jet flames are ejected from the communication holes (13) to the main combustion chamber (5). The thin pre-chamber wall (11) is formed into a two-layer structure of an outside wall (11a) facing the main combustion chamber (5) and an inside wall (11b) facing the pre-chamber (12). The inside wall (11b) is formed by a material with a higher heat conductivity than the outside wall (11a).

Abstract: A rotary engine where the rotor cavity has a peripheral inner surface having a peritrochoid configuration defined by a first eccentricity and the rotor has a peripheral outer surface having a peritrochoid inner envelope configuration defined by a second eccentricity larger than the first eccentricity. Also, a rotary engine where the rotor cavity has a peripheral inner surface having a peritrochoid configuration defined by an eccentricity, and a rotor with a peripheral outer surface between adjacent ones of the apex portions being inwardly offset from a peritrochoid inner envelope configuration defined by the eccentricity. The engine may have an expansion ratio with a value of at most 8. The rotary engine may be part of a compound engine system.

Abstract: A rotor assembly has a sealing system for sealing at apexes or faces of the rotor. An apex seal or face seal comprises a compliant member that is configured such that the shape or orientation of the compliant member can change in use in response to a change in the speed of rotation of the rotor, a change in the pressurization across the compliant member, or a change in clearance between the sealing surface and a mounting element to which the compliant member is mounted, to deflect towards or away from the sealing surface.

Abstract: A rotary engine where the rotor cavity has a peripheral inner surface having a peritrochoid configuration defined by a first eccentricity and the rotor has a peripheral outer surface having a peritrochoid inner envelope configuration defined by a second eccentricity larger than the first eccentricity. Also, a rotary engine where the rotor cavity has a peripheral inner surface having a peritrochoid configuration defined by an eccentricity, and a rotor with a peripheral outer surface between adjacent ones of the apex portions being inwardly offset from a peritrochoid inner envelope configuration defined by the eccentricity. The engine may have an expansion ratio with a value of at most 8. The rotary engine may be part of a compound engine system.

Abstract: A piston assembly is disclosed. In one aspect, the piston assembly includes a rotary piston, wherein the rotary piston comprises a first axis of rotation, a central bore having bore axis and at least two curved first constraint surfaces, and wherein the bore axis substantially corresponds to the first axis of rotation. The piston assembly also includes a substantially hollow-cylindrical bearing ring configured to be at least partially inserted in the central bore. The piston assembly further includes at least one fuse body configured to connect the rotary piston and the bearing ring, and to transmit, at least temporarily, a force in the two opposite axial directions relating to the first axis of rotation between the rotary piston and bearing ring.

Abstract: In one aspect, described is a rotor for a rotary internal combustion engine where a first face seal biased axially outwardly away from the first end face has opposed curled ends abutting a first seal element of a respective one of the adjacent apex seal assemblies, and a second face seal biased axially outwardly away from the second end face has opposed curled ends abutting a second seal element of a respective one of the adjacent apex seal assemblies.

Abstract: A sealing system of rotary piston machines, the rotor excludes rotor discs which are arranged next to one another, and which are seated on the common rotor axle and are pressed apart from one another by acting spring and/or gas forces in the joints between the discs in such a way that the end sides of the discs which point towards the side walls of the housing bear sealingly against the latter and thus prevent the access of the medium to the axles. Assemblies comprising movable shaped lamellae which adapt to the changing joint widths and prevent an inner flow around the rotor are present in the part joints between the discs.

Abstract: A Wankel engine with a peripheral wall of the stator body including a non-circular opening formed therethrough and defining at least part of a port. The opening has a perimeter defined by a first edge and remaining edges, with the remaining edges being located downstream of the first edge with respect to a direction of rotation of the rotor. The remaining edges extend non parallel to a longitudinal axis of the apex seals.

Abstract: A pump rotor for a screw pump includes a shaft, a first set of threads disposed on a portion of an outer surface of the shaft, at least one thread of the first set of threads including a groove disposed on an end portion thereof, and a ring seal disposed on the groove such that the ring seal is configured to protrude outwardly from the groove and to rest against an inner surface of a liner of the screw pump, and the groove is sized so as to allow the ring seal to move radially with respect to the plurality of threads as the rotor is deflected.

Abstract: In one aspect, there is described a rotor of a Wankel engine including a plurality of apex seal members each biased by a respective spring, each spring including an axial action portion and a radial action portion, the axial action portion including at least two radially extending band sections with adjacent ones of the band sections being connected by a fold, one of the band sections contacting a radially extending surface of the apex seal member and another of the band sections contacting a radially extending element of the rotor body, and the radial action portion forming a major part of a length of the spring, contacting an axially extending surface of the apex seal member in two spaced apart locations, and contacting the rotor body between the two spaced apart locations.

Abstract: A six-blade biaxial rotary positive-displacement pump includes a casing formed with a suction port and a discharge port, a pair of rotors accommodated in the casing and having rotor shafts rotatably mounted on housings fixed to opposed ends of the casing, respectively. Each rotor is formed with six blades extending radially equiangularly about the rotor shaft. Each blade is formed so as to have a constant thickness in a rotational direction of each rotor. Each blade has an apex and a valley, and a distance between the apex and the valley is set so as to range from three to five times larger than the thickness of each blade.

Abstract: The aim of the invention is to provide a simple, smoothly running pump, especially a slurry pump, preferably for concrete, which comprises a driven rotor (4) rotating inside a housing (2). According to the invention, the rotor (4) is configured as a polygonal, prismatic body wherein at least the connecting lines of the corners of the base form an equilateral polygon. The rotor performs a rotational movement about its center axis on an orbit, the longitudinal edges of the prismatic body (4?) touching the longitudinal inner wall surface (2?) of the housing (2).

Abstract: A hydrogen G-cycle rotary vane internal combustion engine has a sodium vapor chamber transferring excess combustion heat into combustion chambers. An active water cooling system captures heat from the engine housing stator, rotor, and sliding vanes and transfers it back into the combustion cycle by premixing it with hydrogen to reduce peak combustion temperature and with an early an late stage combustion chamber injection to help transfer heat from the sodium vapor chamber, to control chamber temperature, and to increase chamber vapor pressure. A combustion chamber sealing system includes axial seals between the rotor and the stator, vane face seals, and toggling split vane seals between the outer perimeters of the sliding vanes and the stator. Sliding vanes reciprocate laterally in and out of the rotor assisted by a vane belting system. A thermal barrier coating minimizes heat transfer and thermal deformation. Solid lubricants provide high temperature lubrication and durability.

Abstract: A shaft assembly includes a fluid transfer insert located within a bore of a shaft. The fluid transfer insert seals to the shaft and includes at least one fluid channel that communicates between a plurality of fluid ports located in the shaft. The fluid channel is defined by an outer surface of the fluid transfer insert.

Abstract: A rotary compressor includes a cylinder body, end plate members fitted on both sides of the cylinder body, a roller placed in a cylinder chamber, a blade fitted to the roller, and a bushing for supporting the blade. A width of the bushing in a roller axis direction is larger than an axial width of the roller. A gap in the roller axis direction between the roller and the end plate members is larger than a gap in the roller axis direction between the bushing and the end plate members.

Abstract: Corner seal sockets (26) are formed at the end of apex seal slots (58) formed in a rotor (10). A twisted split washer spring (70) is positioned in each socket (26) between the base wall (28) of the socket (26) and the inner end of the corner seal (16). The springs (70) bias the outer end surfaces of the corner seals (16) against the inner side surfaces of the housing sidewalls (20, 22). A radial apex seal slot (32) is formed in each corner seal (16). The base (38) of each slot (32) is substantially semi cylindrical in shape. It and the cylindrical peripheral surface (44) of the corner seal (16) form an arch shaped bight that connects side portions of the corner seals (16) together. End portions of the apex seals (18) extend into the apex seal slots (32) in the corner seals (16). The end portions of the apex seal biasing spring (60) contacts spring abutments (52, 54) which project radially inwardly from the outer ends of the apex seal (18).

Abstract: Corner seal sockets (26) are formed at the end of apex seal slots (58) formed in a rotor (10). A twisted split washer spring (70) is positioned in each socket (26) between the base wall (28) of the socket (26) and the inner end of the corner seal (16). The springs (70) bias the outer end surfaces of the corner seals (16) against the inner side surfaces of the housing sidewalls (20, 22). A radial apex seal slot (32) is formed in each corner seal (16). The base (38) of each slot (32) is substantially semi cylindrical in shape. It and the cylindrical peripheral surface (44) of the corner seal (16) form an arch shaped bight that connects side portions of the corner seals (16) together. End portions of the apex seals (18) extend into the apex seal slots (32) in the corner seals (16). The end portions of the apex seal biasing spring (60) contacts spring abutments (52, 54) which project radially inwardly from the outer ends of the apex seal (18).

Abstract: A rotary combustion engine includes a peripheral housing, a front housing plate, a rear housing plate, a piston, and an eccentric shaft, where the piston rotates to form three working spaces separated from each other by the tips of the piston. Shaft seals and piston seals seal off the oil-carrying interior space of the internal combustion engine, and the piston is sealed off against the front and rear housing plates by arcuate strips, which are bounded radially on the inside by an envelope curve. The gas forming in the working space during the combustion phase is under high pressure. Some of this gas leaks around the arcuate strips and flows inward along the flat surfaces of the front and rear plates by way of ring-shaped channels in the piston, thus arriving in recessed areas inside the envelope curves, from which it is then escapes through vent channels.

Abstract: A rotary machine including a rotor having apexes provided with apex seals achieves better efficiency through the use of apex split seals which minimize leakage across the apex seals to thereby allow operation at relatively high pressure values.

Abstract: A sickleless gear wheel pump includes an internally geared hollow wheel including a plurality of tooth tips. A pinion includes a plurality of tooth tips and meshes with the hollow wheel. The hollow wheel and pinion are rotatably disposed in a housing. The housing has a suction connection and a pressure connection. The hollow wheel has openings for a medium to be pumped therethrough. Each tooth tip of the plurality of tooth tips of the hollow wheel has a profile groove in which there is present a sealing element that is radially moveable during rotation of the hollow wheel and pinion and which is in sliding seal-off engagement with a respective tooth tip of the plurality of tooth tips of the pinion. Each sealing element is metallic.

Abstract: A crescentless internal gear pump includes a housing with an intake connection and a pressure connection. An internally toothed internal gear has an outside surface and is disposed for rotation within the housing. Each tooth includes a head and a base, the internal gear having radial openings that form a conducting connection between a tooth base and the outside surface. A pinion, which is rotatably disposed within the housing and meshing with the internal gear, has teeth with each tooth including a head. The teeth of one of the internal gear and pinion, includes a profile groove with a base provided in the heads into which a sealing element is disposed and which slides on an opposing tooth head. The sealing element has a sealing surface and includes a channel that produces a conducting connection between the profile groove base and the sealing surface. The sealing element is slightly movable in the profile groove in the radial direction to form a controlled gap.

Abstract: A positive displacement rotary pump with an improved impeller design integrating a replaceable wiper insert. The impeller generally has or more lobes and an equal number of conjugate surfaces. Each lobe has a cavity which holds a wiper blade. The wiper blade improves efficiency by making a seal with a pump chamber or the conjugate surface on the other impeller as it rotates. The wiper is pressed radially outward from a central axis of the impeller by a biasing means such as a spring.

Abstract: There is disclosed a fluid driven motor of particular use, for example, in drilling apparatus or in powering underwater excavation apparatus. Known motors suffer from a number of problems, e.g. lack of sufficient hydraulic efficiency. According to one aspect of the present invention there is provided a motor comprising a stator and a rotor rotatably mounted in the stator, wherein the stator is provided with at least one rod recess formed in an inner surface thereof, the stator providing at least one inlet/exhaust port communicating between a surface of the rod recess and an outer surface of the stator, the rotor is provided with a rotor channel and at least one channel for conducting motive fluid from the rotor channel to a chamber between the rotor and the stator, and the at least one rod recess is provided with a rod which, in use, may form a seal between the stator and the rotor.

Abstract: Apex seals are installed in slots in the apexes of a rotor in a rotary engine. Each apex seal assembly includes an outer sealing member, an inner support member, a pair of side or end members, a pair of hollow cylindrical slotted corner seal members mounted in the corner recesses, a pair of solid cylindrical resilient inserts mounted in the corner seal members and a pair of underseal springs to urge the seal members outwardly towards the running surface. The apex seal and its slot are tilted with respect to the rotor lobe centerline. The sealing and support members have mating inclined surfaces which form an inclined interface which is spaced entirely outside of the outer cylindrical surface of the corner seal member.

Abstract: A rotary internal combustion engine includes a rotor with apex seals installed in slots which extend axially through apexes of the rotor. Each apex seal includes at least one passage which extends therethrough in a circumferential direction to equalize gas pressure on opposite sides of the apex seal. An insert formed out of a low friction material is loosely received in each passage to reduce the volume exposed to gas pressure.

Abstract: An axial sealing system of a rotary piston engine with a triangular piston and a dual-arc casing runway surfacing with which a seal body arranged in axial groove or groove bore cooperating sealingly after each axial sealing strip at a preceding end thereof for sealing therewith and the preceding sealing plug under gas pressure from the working or operating chamber. The sealing body is a second sealing plug cut into by the sealing strip and the first sealing plug. Also this can be a sealing strip segment having a configuration that fits with respect to the cutout of the sealing strip and the first sealing plug.

Abstract: A method for manufacturing an apex seal for a rotary piston engine comprising steps of preparing an apex seal blank made of ceramic material, and applying a high energy heating radiation to the sliding surface of the apex seal blank to form a roughened and porous structure on the surface portion of the apex seal blank. The high energy heating radiation is desirably applied to the apex seal blank under a non-oxidizing atmosphere so that an oxidization of the components of the ceramic material can be prevented.

Abstract: Conventional industry practice has been to provide apex seals along adjoining intersecting peripheral surfaces of the envelope members in trochoidal rotary devices. The trochoidal member profiles are then recessed by a seal offset amount and the seals extended from the apices of the envelope member by the seal offset amount to minimize reciprocation of the seals in their grooves. In accordance with the invention, modified epitrochoids and corresponding envelopes are formed so that sealing faces of the apex seals can be substantially continuous with the envelope peripheral surfaces. In this manner, nearly ideal expansion ratios are achievable in such rotary devices and wider sealing faces can be used than heretofore practical.

Abstract: An end-face seal for the rotary internal-combustion engine incorporating seal strips received pairwise within each of the grooves running peripherally in the end face of the rotor between seal elements provided at the apexes of the rotor, said seal strips being resiliently pressed against the working surfaces of the end walls of the engine housing. One of said seal strips received within each of said grooves is resiliently pressed against the seal element provided at the associated apex of the rotor and leading said seal strip when the rotor is set rotating.

Abstract: A seal assembly for sealing a variable gap between the surface of a first element and a second element movable relative thereto. A seal may comprise a seal housing attached to the second element for movement therewith and having a sealing surface thereon and at least one elongated seal member carried by the housing having first and second conjugate sealing surfaces thereon, the first sealing surface for rubbing and sealing engagement with the first element surface and the second sealing surface for sliding and sealing engagement with the housing sealing surface. A biasing assembly may be carried by the housing for biasing the first and second conjugate sealing surfaces of the sealing member toward sealing engagement with the first element surface and housing sealing surface, respectively.

Abstract: The seal grid system for a rotary piston mechanism of the Wankel-type comprises apex seal blades, a conventional side seal assembly consisting of side seal strips and button or seal pins carried on one side face of the rotary piston and a sealing surface portion or rib projecting axially from the other side face of the rotary piston and extending endlessly around the rotor face. The seal surface portion is spaced radially inwardly from the peripheral surfaces of the rotary piston to expose a portion of the other side face to the pressurized gases in the working chambers so that the axial forces on each of the side faces of the rotary piston are at least in part counter-balanced.

Abstract: A rotary mechanism having improved seal life including a housing defining an operating chamber having a wall configuration based on a desired geometrical shape which is an n order harmonic curve where n is an integer of 1 or more, a shaft journalled in the housing and having an eccentric within the chamber, and a rotor within the chamber and journalled on the eccentric and having a working surface based on the desired geometric shape and which is an n+1 order harmonic curve to define n+1 equally angularly spaced apexes or noses on the surface. n+1 seals are carried by the rotor, one at each apex or nose and timing gearing interconnects the rotor and the housing to establish relative rates of rotation between the housing, the shaft and the rotor. The chamber wall further is defined by an n+1 harmonic curve superimposed on the n order harmonic curve which minimizes relative movement between the seal and the rotor to improve the life of the seals.

Abstract: A seal for rotary pumps, engines, and the like, comprises roller means with variable effective length held in a variable-length supportive body or holder; extension cams maintain longitudinal tolerance of the roller means despite mechanical wear, machining imperfections and thermal expansion and contraction; wedge means maintain longitudinal tolerance of the holder. The seal is effective both at apex and corner areas of the rotary apparatus.

Abstract: The bar seal for use in a rotary mechanism and which is disposed for sliding movement in a groove and to sealingly engage a surface, has an elongated base structure of high wear resistance characteristic and a body portion of a material having a low coefficient of friction connected to the base structure to form a unitary assembly. The body portion is dimensioned to extend a substantial part of the length of the base structure and of a width to form opposite planar surfaces for contacting the walls of the groove.

Abstract: An improved rotary mechanism including a housing having a chamber with a wall of a predetermined geometric shape including at least one lobe, the lobe being defined by a continuous curve, a shaft journalled in the housing and having an eccentric within the chamber, a rotor journalled on the eccentric for rotation and translation within the chamber, the rotor having plural apexes, each being provided with an apex seal receiving groove, the wall of the housing deviating from the predetermined geometric shape by being spaced outwardly from the envelope of the predetermined geometric shape and by being generally spaced inwardly from the envelope of a closed geometric figure spaced outwardly of and parallel to the predetermined geometric shape. The closed geometric shape has sharp transition points at the lobes and the wall at the lobes is defined by a continuous curve substantially encompassing the sharp transition points and extending to both sides thereof.

Abstract: A rotary engine utilizing hydrocarbon fuel having a circular rotor with one or more spaced pistons which are in sealing relationship with a generally circular torus. One or more compression expansion valves which rotate about an axis tangent to the torus wall are in sealing relation with the rotor and have a combustion chamber formed in the hub thereof. As the valve rotates about an axis, compression and expansion ports alternately communicate with the interior of the torus. One or more divider valves separate the intake and exhaust functions of the cycles and have a rotation about an axis tangent to the torus wall. The divider valves are in sealing relationship with the rotor body with a notch which allows the pistons to pass therethrough. The piston draws a vacuum on the intake valve, pulling gas into the torus and compressing the gas ahead of the piston into the combustion chamber through a compression port.

Abstract: A rotary piston internal-combustion engine adapted to operate on a hydrogen fuel gas mixture injected into the intake chamber of the engine through a plurality of spaced intake ports in the engine housing designed to distribute the flow of the fuel gas mixture evenly along the width of the intake chamber. The exhaust gas outlet of the engine includes a plurality of spaced small exhaust ports so as to decrease the dwell of the apex seal of the rotary piston as it passes over the exhaust gas outlet. The fuel supply system to the engine includes a plurality of mixing chambers to ensure thorough and uniform mixing of the fuel gas mixture, an intake header for distributing the fuel gas mixture to the intake ports, and means for preventing back-fire of the fuel gas mixture in the system. Lubricant may be supplied to the interior of the engine through the fuel intake ports in the form of a lubricating vapor in admixture with the fuel gas mixture.

Abstract: An improved sealing structure for rotary engines of the type having a housing with a rotor therein, the latter having at least two apices. The rotor includes a plurality of grooves corresponding to the number of apices and each groove is located at a respective one of the apices. A plurality of apex seals is provided with one disposed in each of the grooves so as to extend partially out of the groove to engage the housing. Each seal includes an internal closed cavity and the cavity, in turn, is only partially filled with a body of vaporizable material. The material has the characteristic of undergoing a phase change to the vapor phase when subjected to the relatively high temperatures present within the housing due to combustion gasses and frictional contact with the housing and from the vapor phase when subjected to the relatively lower temperature of the rotor. The material circulates within the seal while undergoing phase changes to continuously cool the seals to preclude distortion of the same.

Abstract: A rotary engine rotor housing having an exhaust port in the rotor housing's inner peripheral wall which is spanned at the center by a peripherally extending bridge that is coextensive with the inner peripheral wall and has a coolant passage therethrough through which coolant is forced to circulate from one axial flow coolant passage in the rotor housing to another by means of heating, velocity differential, ram effect and a negative pressure zone.

Abstract: A composite metal rotor tip seal for use in rotary internal combustion engines and a process for making a composite rotor tip seal. The composite seals are formed from at least two different metals or alloys having different frictional and wear characteristics whereby uniform wear and improved sealing are obtained. The seal is mounted so that different components of the composite contact the chamber wall during operation. A process for producing composite material, for the fabrication of composite seals, utilizing a pressure welding process is also described.

Abstract: In an internal combustion rotary engine having a rotor housing with a rotor having apex seals sliding on the rotor housing there is provided a dynamic damper secured to each apex seal for damping apex seal vibrations caused by the rotor housing as excited by the engine firing cycle and there is also provided a dynamic damper secured to each apex seal for damping apex seal vibrations caused by apex seal bending.

Abstract: A composite metal rotor tip seal for use in rotary internal combustion engines and a process for making a composite rotor tip seal. The composite seals are formed from at least two different metals or alloys having different frictional and wear characteristics whereby uniform wear and improved sealing are obtained. The seal is mounted so that different components of the composite contact the chamber wall during operation. A process for producing composite material, for the fabrication of composite seals, utilizing a pressure welding process is also described.

Abstract: An improved rotary mechanism such as a rotary engine provided with improved seals. The mechanism includes an operating chamber with a rotor therein, the rotor being provided with at least one seal receiving groove. An improved seal is located in the groove and comprises a seal element extending partially out of the groove, a spring secured to the seal for biasing the seal into sealing engagement with the chamber walls, and a carrier element secured to the spring. The carrier element includes resilient means having an unstressed width slightly greater than the width of the groove to grip the groove to positively retain the unitized seal assembly therein.

Abstract: A seal for rotary pumps, engines, and the like, comprises roller means with variable effective length held in a variable-length supportive body or holder; extension cams maintain longitudinal tolerance of the roller means despite mechanical wear, machining imperfections and thermal expansion and contraction; wedge means maintain longitudinal tolerance of the holder. The seal is effective both at apex and corner areas of the rotary apparatus.

Abstract: A multi-apex rotary combustion engine rotor has simplified side face circular compression seals mounted in circular grooves passing across the face of corner button seals. The button seals are of a substantially enlarged diameter permitting machining of the circular seal grooves in the rotor side face.