Abstract: The side housing of a rotary piston engine has an inner surface which has been subjected to a soft-nitriding treatment to form a layer of Fe-C-N type compounds and thereafter ground to provide a surface roughness of between 0.3 and 15 microns. An oil seal which slidably engages the inner surface of the side housing has a sealing lip constituted by a chromium plating. The arrangement provides an improved wear resistance of the oil seal.

Abstract: Rotary piston engine has a rotor which is applied with coatings of a fluoride resin at each side surface in the vicinity of side seals so as to fill clearance between the rotor side surface and the adjacent inner surface of the side housing whereby an improved gas-tightness is obtained.

Abstract: A wear-resistant coating is provided for a sealing strip used in a rotary engine having a trochoidal chamber made of a supereutectic aluminum-silicon alloy. The coating consists essentially of chromium or a chromium alloy applied by plasma deposition welding.

Abstract: A reverse Brayton cycle rotary vane cooling system having a compressor and an expander driven by a common shaft. The vanes which slide in slots in a rotor are actuated by cams and cam rollers. The vanes are constructed with high modulus of electricity fibers in an epoxy resin binder. The outer wear surface of the vanes contain a material with self lubricating properties.

Abstract: A friction stressed machine part of cast iron with a ledeburitic-containing bearing surface contains 0.1 to 10 area percent of predominantly nodular-shaped graphite in the ledeburitic-containing bearing surface. A number of methods for producing such a machine part are provided, including, casting the machine part against a quenching plate so that it hardens in a mottled manner in the region of the bearing surface.

Abstract: An eccentric worm pump in which a helical worm rotor rolls off in a planetary manner in a multi-thread hollow helix of a stator sleeve. The helix is adapted to its cross-section and its pitch. Closed helical cavities between the rotor and the opposite part of the helix, are formed and moved from an intake end to a delivery end of the stator sleeve. A plurality of interchangeable annular wearing elements are arranged staggered axially in the roll-off track between the rotor and the stator. The wearing elements may be in the form of collars fixed relative to one another and rotatably adjustable axially relative to the rotor. The collars are braced by a reset device attached to the free rotor end between ring shoulders. The collars have an outer surface which rolls off in the hollow helix and has a layer of elastically resilient wearing material. The wearing material is in the form of a wear-proof sliding synthetic substance.

Abstract: Plastics recovery, compounding and fabricating apparatus is disclosed utilizing a gear pump specially designed to include a media free space between the gear face and side walls with minimum sealing to improve volumetric pump efficiencies and provide pumping capacity insensitivity to viscosity over a wide range.

Abstract: A pump is comprised of a housing within which a rotary piston is rotatably mounted, to define therebetween an annular conveying channel between an inlet port and an outlet port. Annular sealing rings between the piston and housing seal the conveying channel at the periphery of the piston. A stopper extends into the conveying channel in the back flow path, and sealing elements are provided to seal the entire cross section of the back flow paths. Radially movable slides on the piston are resiliently urged into the conveying channel, the radial position thereof being controlled by a cam surface in the housing. The slides are urged radially outwardly by springs, and seals are provided on the piston for sealingly guiding the piston in the radial direction.

Abstract: An improved seal for a rotary engine to reduce leakage at the rotor apex under normal operating temperatures. Opposite edges of the seal have differing coefficients of thermal expansion so that as the seal heats up, thermal expansion forces cancel the effect of non-uniform temperature across the seal to insure flush contact with the housing wall.

Abstract: A method for manufacturing a housing casing for a rotary piston internal combustion engine, especially of trochoidal construction, as well as the housing casing made according to this method, whereby the housing casing consists of light metal whose internal running surface for the piston consists of a coating of hard material; the method thereby involves leaving during the machining of the inner wall of the housing casing a material island of such light metal about the discharge opening of the already bored or still to be bored spark-plug-firing channel, whose height corresponds at least to the thickness of the coating to be subsequently provided along the inner contour of the housing casing in the finish-machined condition; as a result thereof the area of the discharge opening of the firing channel is constituted exclusively of such light metal.

Abstract: Rotor housing for rotary piston engines having a base and a chromium-plated inner wall. The base is made of an iron-based material having a hardness of not less than 105 in Vickers' scale and the chromium-plated layer has a hardness not less than 850 in Vickers' scale. The rotor housing is used with a rotor having apex seals of iron-based material which includes 50 to 75% in volume of carbide at least in a sliding surface which is adapted to be brought into sliding engagement with the inner wall of the rotor housing, said apex seal having a hardness of 700 to 900 in Vickers' scale at the sliding surface.

Abstract: In a rotative machine for fluids which includes a plate formed with spiral-like passages extending from a central orifice to an annular interval and which also includes, facing the passages, a support rotatably mounting vane wheels for rotation about axes which are perpendicular to the axis of rotation of said plate, the vanes of said vane wheels have a dimension at their attachment to the body of the vane wheels which is different from that at their frontal side, permitting manufacture of the plate by simple die-casting. A method is also provided for determining the contour for both the passages and the cooperating sliding surfaces of the plate and the support for the vane wheels which will result in the maximum output for the machine.

Abstract: A rotary gas compressor or expansion motor with a housing having circumferentially spaced inlet and outlet ports. An outer cage or sleeve rotor has alternate slots and teeth. An inner lobe rotor has lobes which mesh with the slots of the cage rotor as the two rotate. The space between the two rotors is filled with a crescent-shaped housing member. The slots, teeth and lobes of the rotors are helical.

Abstract: A compressor-expander for use in air conditioning including a chamber of generally elliptical cross section having a compressor side and an expander side each with inlet and outlet ports. Rotatable in the chamber is a vaned rotor defining enclosed compartments in which the air is positively compressed accompanied by an increase in temperature in the compressor side and is positively expanded with a decrease in temperature in the expander side, the elliptical eccentricity of the compressor side being less than 0.62 and the eccentricity on the expander side being less than the eccentricity of the compressor side in a ratio lying between 0.68 and 0.95. Pressure in the compartment at the point of discharge is substantially at atmospheric level, and the expander outlet port is so located that when a compartment on the expander side is centered on the major axis, the leading vane is at the threshold of discharge.

Abstract: The rotor, in the embodiment depicted, comprises a rotor blank having a hub with at least one radially extending tooth, the rotor being sheathed in plastic, excepting for the hub surface areas. Throughgoing bores formed in the blank receive plugs or dowels of the plastic to secure the sheathing in place. Additionally, the periphery of the blank has an inwardly-widening groove formed therein to fix plastic sheathing also on the periphery. The rotor is formed of steel, and the plastic sheathing has a coefficient of expansion which is the same as that of the steel.

Abstract: A displacement pump, especially cell pump for high speeds, for compressing gaseous media, which includes a housing in which a rotatable body is journaled having slides radially movably guided therein. The bearings for the rotatable body are radially guiding loose bearings with oil lubrication. Between the bearings for the rotatable body and in the rotatable body there are provided radially slidable discs with spiral grooves. The slides and the housing and/or a cylinder inserted into said housing are made of steel, and the inner wall surface of the housing or of the cylinder forms a smooth sliding surface for the slides.

Abstract: A rotary piston engine has a pair of side housings made of high silicon aluminum alloy and a rotor made of iron-based material. The side surfaces of the rotor are subjected to a surface treatment called "Sulfinuz" to form surface layers rich in sulphur and nitrogen for minimizing scuffing between the side surfaces of the side housings and the side surfaces of the rotating rotor due to thermal expansion of the side housings and vibration of the rotor.

Abstract: In a rotary sliding vane pump having a non-circular cam ring which expands and contracts radially, a cheek plate is clamped against the end face of the cam ring and lies in rubbing contact with the rotor and vanes. The cheek plate has a wearing face of low friction material such as bronze. Unwanted wear between the cheek plate and the cam ring due to its expansion/contraction movements is reduced by the provision of one or more areas of hard metal adjacent the cam ring.

Abstract: An improved internal combustion engine of the type having a relatively high surface to volume ratio. An exemplary embodiment depicts the invention in a rotary engine having a rotor within a combustion chamber. The surfaces of the rotor that are exposed to the gases of combustion are provided with a plurality of pockets. Within each pocket is a heat insulating medium. The pockets are covered by a plurality of individual covers, one for each pocket. Heat flow to the rotor is thereby reduced to increase engine operating efficiency.

Abstract: Rotary piston engine having a rotor housing applied with a pin-point type porous chromium plating having porosity of 10 to 60 percent and a hardness of 930 to 1200 in Vicker's scale. The engine also has a rotor having apex seals each constituted by cast iron based material. Each apex seal has a sliding surface including 50 to 70 volume percent of carbides and a hardness of 700 to 900 in Vicker's scale.

Abstract: An improved slant axis rotary mechanism of the type including a housing defining a chamber having a radially outer spherical wall and a radially inner spherical wall interconnected by opposed, generally radially extending side walls. A shaft is journalled within the housing and has an angularly offset portion within the chamber. A rotor is within the chamber and journalled on the angularly offset portion. The mechanism is provided with an improved cooling system including a plurality of coolant receiving conduits in the walls in close proximity to the chamber. A thin, wear resistant layer is disposed on the walls within the chamber and interiorly of the conduits. The conduits are located closely adjacent the intersections of the side walls and the spherical walls to provide excellent cooling.

Abstract: An improved abradable coating particularly useful to control clearances between relatively moving members in a sealing relationship includes a base portion and an abradable coating portion which is the fusion and interaction product of a mechanical mixture of a plurality of powdered materials comprising a nickel-graphite powder and a nickel-chromium-base alloy powder. One method for making such a seal member includes applying a strippable bond coat of predominantly nickel between a base portion of the member and a subsequently thermal deposited coating.

Abstract: An improved rotary engine including a housing having interior walls defining an operating chamber with a rotor mounted for movement therein. Within the chamber is a thin layer of wear resistant metal which is located to be sealingly engaged by the rotor as the rotor moves within the chamber and a backing is secured to the thin layer in good heat transfer relation and interposed between the same and the housing for transmitting pressure applied to the thin layer to the housing. The backing is formed of a metal having high thermal conductivity and is provided with a plurality of relatively closely spaced coolant passages to provide an improved cooling structure for the engine to thereby extend its life.

Abstract: A rotary trochoidal compressor comprising a rotor mounted for planetary motion within a housing and in which the peripheral surface of the compressor rotor is substantially a hypotrochoid and the peripheral inner surface of the housing is the outer envelope of the rotor and in which a compressible layer is provided on the inner surface of the rotor housing for sealing against the rotor peripheral surface.

Abstract: A fluid operable rotary piston device having a housing with gas inlet and tlet means and a hollow cylinder rotatable therein having gas inlet and gas outlet ports which communicate with the gas inlet and outlet means during rotation of the cylinder. A rotary piston is rotatable on an eccentric axis inside the cylinder and the cylinder and piston have interengageable means forming contact free working chambers. Axial sealing strips are mounted on one of the piston and cylinder and form contact free sealing gaps between adjacent working chambers. The cylinder rotates in the housing in contact free relation therewith and a transmission connects the piston and cylinder for rotation at respective speeds.

Abstract: An interior seal for rotary piston engines in the form of a cast iron scraper ring is arranged for axial movement in an annular groove in one face of the piston; and an annular scraping edge of the seal slides along the interior surface of the neighboring end wall of the housing.

Abstract: An improved abradable coating particularly useful to control clearances between relatively moving members in a sealing relationship includes a base portion and an abradable coating portion which is the fusion and interaction product of a mechanical mixture of a plurality of powdered materials comprising a nickel-graphite powder and an aluminum-copper base alloy powder.

Abstract: A housing structure for a rotary piston internal combustion engine comprises at least one peripheral casing having an epitrochoidal surface formed therein, and a pair of end walls connected to each other with the peripheral casing situated therebetween. Portions of the end walls and peripheral casing which are simultaneously exposed to one of the working chambers in which the expansion stroke is taking place, that is, the expansion chamber, has therein respective heat insulating layers so as to substantially avoid a possible reduction of the temperature of the exhaust gas staying within the expansion chamber.

Abstract: A rotary trochoidal compressor comprising a rotor mounted for planetary motion within a housing and in which the periphery of the rotor is substantially a hypotrochoid and the peripheral inner surface of the housing is the outer envelope of the rotor and in which a radially movable or elastic seal means is provided in the housing at the hypotrochoid generating points and the intake and outlet ports are so disposed in the housing on opposite sides of each hypotrochoid generating point such that each working chamber closes to an intake port before it opens to an outlet port, the working chamber being formed between the seal means at the rotor nose portions or between seal means at a rotor nose portion and at a hypotrochoid generating point.

Abstract: A method of manufacturing arcuate sealing strips for the pistons of rotary piston machines. The running surface on one face of the strip carries a wear-resistant hard layer.

Abstract: Improved structure for cooling the rotor of a rotary engine wherein a heat pipe structure is provided extending inwardly from an outer portion of the rotor for transferring heat inwardly to a heat transfer structure within the rotor. Heat is transferred through the heat transfer structure from the heat pipe to lubricant coolant flowed through a grooved wall inwardly of the heat pipe and outwardly of the rotor bearing. In the illustrated embodiment, the heat pipe is provided with a body of water for effecting the desired heat transfer from the rotor apex.

Abstract: A stator-rotor assembly wherein rollers are used to form the internal teeth of the stator. The rotor has one less tooth than the stator and cooperates in gear relationship with the internal teeth of the stator. The stator has a plurality of cylindrically shaped pockets each containing a cylindrical roller. Each pocket is covered with a crushable porous coating to a thickness of X units. The radius of the pocket is R units and the radius of the rollers is equal to or greater than R-X units and less than R units. Each roller crushes the coating at spaced locations to trap fluid between the rollers and the pocket. The rotor has an average diameter that interferes with the tangent circle of the stator-roller assembly.

Abstract: A method of surface hardening for forming a hardened layer of cemented carbide, including cementite, on a local surface area of cast iron by rapidly melting the local surface by means of a rapid melting process such as the electron bombardment melting process to form a molten pool thereon, then rapidly cooling the molten pool by the chilling effect of the non-molten portion of cast iron and finally finishing the cast iron having the hardened layer thus formed to a desired shape. To this end, the cast iron used contains therein one or a mixture of deoxidizing agents such as aluminum, magnesium and calcium.

Abstract: A multi-apex rotor for an internal combustion rotary engine is provided on its radially outwardly facing flanks with hot plates which each form a portion of a combustion chamber and have a shape and coefficient of expansion in relation to the rotor body so that they are normally separated within their periphery from the adjacent flank by a sealed air space so as to be insulated therefrom and thereby retain a substantial portion of the heat of combustion and on hot plate temperature rise with engine speed and load to a level below that which would cause pre-ignition expanding radially inwardly to establish a substantial heat conducting relationship with the flank to thereby limit hot plate temperature to below the pre-ignition temperature.

Abstract: A base metal, such as the aluminum or iron housing of a conventional rotary or reciprocating-piston internal combustion engine, and a sealing member applicable to the pistons or rotor thereof are coated with a layer of a wear-resistant alloy, such as molybdenum-ruthenium or tungsten-ruthenium alloy, either by evaporating the elements of the alloy be electron guns onto the surfaces to be coated or by vaporizing a wire of the same alloy in a vacuum chamber by the application of a high-tension electrical discharge through the wire from an electrical condenser bank. Depositing the alloy is done on a production basis by passing workpiece holders in a circular path through a vacuum chamber beneath the electron guns, followed by a realloying step through a laser beam, an acid dip, a rinsing dip, a drying by heat, and a final honing.

Abstract: A slant axis rotary mechanism such as an engine, pump, or the like. The mechanism includes a shaft having an angularly off-set portion journalling a rotor thereon. The rotor has a peripheral flange with a plurality of apices on each side of the flange. The mechanism further includes a housing defining an operating chamber receiving the rotor and including an outer spherical peripheral wall adapted to be sealingly engaged by a seal carried by the periphery of the flange. The housing also includes spaced, generally radially extending side walls adapted to be sealingly engaged by seals carried by the rotor apices. According to the invention, the housing is defined by a pair of housing segments flanking the rotor, each segment having one of the radially extending side walls formed therein. A liner having a spherical inner surface defining the outer spherical peripheral wall is clamped between the housing segments.

Abstract: An improved ported mechanism such as an engine, compressor or the like. The mechanism includes a housing defining a chamber and a liner is disposed within the housing and supported thereby to define the chamber walls. Coolant passages extend between the housing and the liner and a piston is movable within the chamber. A port receiving opening is located in the housing and a port in the liner is provided and includes a tubular element extending from the liner into the opening. A fluid-impervious heat transfer impeding structure is exteriorly of and surrounds the tubular element and is disposed within the opening. A flexible seal is in the opening and interposed between the housing and the heat transfer impeding device so that the seal prevents leakage at the port and the impeding device prevents rapid deterioration of the seal.

Abstract: The casing of a rotary engine has a combustion chamber in which a rotor having a precisely circular section is supported by a center shaft. Part of the peripheral wall of the combustion chamber has the same size as the circumference of the rotor and the rest of the wall is larger than the circumference of the rotor. Accordingly, a requisite length of the circumferential surface of the rotor is kept in sliding contact with the peripheral wall all the time, while the rest of the circumferential surface of the rotor is always out of sliding contact with the peripheral wall to provide a space in the combustion chamber. The circumferential surface of the rotor is partially recessed to provide a cavity for accommodating a fuel-air mixture.

Abstract: Cooling means are provided for the stationary and orbiting scroll members of scroll-type apparatus. These cooling means comprise fluid coolant channels in the end plates and in the involute wraps of the scroll members and means to circulate a fluid coolant therethrough. In the case of the stationary scroll member the coolant may be water, oil or the like; while in the case of the orbiting scroll member the coolant is the lubricating oil used to lubricate a thrust bearing and the coupling means. The resulting effective cooling of the scroll members makes it possible to form scroll apparatus in large sizes.

Abstract: A rotor housing for a rotary internal combustion engine is disclosed having a wear-resistant coating system characterized by high temperature hardness stability and controlled porosity to improve the lubricating characteristics of the surface-to-surface engagement with the rotary apex seals. The coating system comprises a self-fused composite of martensitic stainless steel powder and an equally hard powder consisting of a nickel-based alloy. Powder particle size is controlled to render a smoother machined surface and sub-surface porosity. An intermediate transition coating may be used consisting of a composition selected from nickel aluminide, are sprayed nickel, molybdenum, all effective to operate as a bonding intermediate to a supporting aluminum structure.

Abstract: A rotary piston machine comprising a housing having a bore to receive a three apexed rotor. The bore has a lining formed with a trochoidal surface. The lobes of the surface are formed on curved flexible metal elements and the re-entrant portions of the surface are formed on rigid bridging pieces between the ends of elements.

Abstract: This invention relates to a method of electroforming the epitrochoidal running track for the rotor of a rotary internal combustion engine. The method involves the electrodeposition of a sequence of plates on a mandrel of epitrochoidal shape and having a chromium surface, and casting an aluminum alloy housing onto the final plate. The sequence of plates applied to the mandrel with the chromium surface involving (1) a first plate of poor adherence selected from the group consisting essentially of nickel, cobalt, iron or their alloys, (2) a wear-resistant plate and (3) a final plate to aid in securing good adhesion of the aluminum housing cast thereon. These are the main steps. Intermediate steps may also be involved such as using two or more wear-resistant plates in step (2). Also step (1) with step (2) can be combined in one plating step.

Abstract: An internal combustion engine including improved seals with longer wearing capability. The engine includes a housing having an interior wall defining a combustion chamber and a member movable within the housing, the member being subjected to hot gases of combustion. A sealing device is mounted on the member for movement therewith and establishes a seal between the member and the interior wall. The improved seal embodies at least one insulating member carried by the seal and in relation to resist heat transfer of heat from hot gases of combustion to the seal so that the seal will run at a cooler operating temperature to reduce wear. The invention may be employed in either reciprocating engines or rotary engines.

Abstract: An oil seal ring is obtained which can maintain its oil scraping performance at a satisfactory level despite the frictional wear it undergoes. It is formed with a tapered sliding surface having a hardness maximized at its oil scraping edge and decreasing with the distance therefrom. It can be manufactured by casehardening a ring blank through one end surface thereof which is oppositely tapered and subsequently finishing the end surface to shape.

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: A structure for preventing oil leakage which occurs between a side wall of a rotor and the inner surface of a side housing in a rotary engine, comprising at least one oil groove formed in the side wall of the rotor in a region located inside of a conventional annular oil seal means. The oil groove formed in the side wall of the rotor extends helically around the center of the rotor.

Abstract: A housing for circular piston combustion engines of trochoid type is produced with at least one annular shell having an inner peripheral wall in the shape of a multi-arcuate trochoid, an outer peripheral wall, and end walls parallel to each other and adjoined to the ends of the shell, end pieces parallel to each other having end walls parallel to each other and an inner and an outer peripheral wall. In the case of a multiple engine at least one end piece constitutes a middle piece between neighboring shells.

Abstract: Rotor housing for a rotary piston type engine comprising a liner made of a metal sheet having one surface formed with teeth-like projections, said liner being formed into a trochoidal configuration with said one surface directed outside, and an aluminum based metal housing substrate cast around the liner whereby firm bonding is assured between the liner and the housing substrate due to the existence of the projections. Novel method for manufacting such a rotor housing is also disclosed.

Abstract: The friction surface of a cast iron side wall member for a rotary piston engine is hardened by iontriding in an electrical glow discharge in a gas atmosphere containing nitrogen, after coating the areas not to be hardened, to inhibit glow discharge at those areas.

Abstract: Rotor housing for a rotary piston type engine comprising a liner made of a metal sheet having one surface formed with teeth-like projections, said liner being formed into a trochoidal configuration with said one surface directed outside, and an aluminum based metal housing substrate cast around the liner whereby firm bonding is assured between the liner and the housing substrate due to the existence of the projections. Novel method for manufacturing such a rotor housing is also disclosed.