Abstract: A piston ring is formed from a ring blank, e.g., a wire, that has a cross sectional profile including upper and lower surfaces that are generally parallel and disposed between inner and outer peripheral faces. The cross sectional profile also includes a hook area at the outer portion of the lower surface that includes a nose area. The nose area is provided with a radius that is as sharp as possible, and is disposed such that a grinding operation performed on the lower surface, e.g., with a single generally planar grinding surface, will also grind the nose area, thereby truncating the nose area and increasing sharpness of the nose area without having to perform additional machining operations.

Abstract: A piston ring formed of cast iron provides improved machinability and exceptional performance and minimum costs. The cast iron includes 2.2 to 2.9 wt. % carbon, 3.2 to 4.2 wt. % silicon, 0.75 to 1.25 wt. % copper, 1.0 to 1.5 wt. % manganese, 0.09 to 0.15 wt. % sulfur, not greater than 0.2 wt. % phosphorous, and an average carbon equivalent of 3.8. The cast iron preferably includes a matrix of martensite with MnS and carbides dispersed therein. The matrix is also preferably free of ferrite, austenite, and steadite. The cast iron is formed by casting, autenitizing, quenching, and tempering the alloy.

Abstract: COMPENSATIVE AND SEALING RINGS FOR PISTONS OF ENGINES, COMPRESSORS, EXHAUSTERS AND PUMPS, invention patent for piston rings according to the title, being the compensative subdivided in models AC1 (picture 1), AC2 (picture 6), AC3 (picture 12) and AC4 (picture 15), characterized by indents and saliencies or bosses that fit on their ends (pictures 1 and 6) and overlays (composed rings as seen in pictures 1, 6, 12 and 15), and the Sealing Rings subdivided in models AVCE1 (picture 20), AVCE2 (picture 27), AVCE3 (picture 33), AVCE4 (picture 40), AVCE5 (picture 45) and AVCE6 (picture 53), characterized by fitting in built-in grooves unified to the conventional, thus sealing the oil and gases escape. They are endowed with self-propulsive force or are impelled or driven by the propelling spring ring.

Abstract: Disclosed is a piston ring for an engine and a method of manufacturing the piston ring. The piston ring includes at least a Cr (Chromium) coating layer coated on a surface of a base material, and a Si-DLC (Silicon doped Diamond Like Carbon) coating layer coated on an outermost layer above the Cr layer and the base material. More specifically, the Si-DLC layer includes about 3 to 10 wt. % of Si.

Abstract: A piston ring assembly includes a ring or rail defining a seal surface configured to seal against a piston bore surface of an engine. The seal surface defines a radially outer periphery. The oil control rail assembly further includes two positioning rings. A first one of the positioning rings is disposed axially above the oil control rail and a second one of the positioning rings is disposed axially below the oil control rail. Each of the positioning rings defines an outermost periphery of the positioning ring that is disposed radially inward with respect to the seal surface of the oil control rail. The outermost peripheries of the positioning rings thus generally do not contact a bore surface that is contacted by the seal surface of the oil control rail.

Abstract: To provide a price-competitive compression ring having excellent thermal conductivity and thermal sag resistance, which can be used in a high-thermal-load environment of high-compression-ratio engines, steel identified by the material number of SUP10 in JIS G 4801, which contains small amounts of alloying elements, is used, and a piston ring wire is annealed before an oil-tempering treatment such that spheroidal cementite having an average particle size of 0.1-1.5 ?m is dispersed in a tempered martensite matrix, thereby suppressing the movement of dislocation and creep even at 300° C., and improving thermal sag resistance.

Abstract: Embodiments are directed to multi-reservoir infusion devices, systems, and methods of using the same for dispensing materials. In some cases, the devices, systems and methods may be used for infusing a material such as medicament, e.g., insulin, into a body in need thereof.

Abstract: Provided is a piston ring such that it is possible to sufficiently inhibit adhesive wear when the piston ring is mounted to a piston for a diesel engine in which at least the piston ring groove in the piston is formed from steel or cast iron. Disclosed is a piston ring mounted to a piston for a diesel engine, wherein the load length ratio (Rmr2) (in accordance with JIS B0601:2001) of the top surface and bottom surface of the piston ring satisfies each of the following conditions: Rmr2 (0.5%, 0.3[mu]m)=20% and Rmr2 (0.5%, 0.4[mu]m)=40%.

Abstract: An oil wiper ring, comprising a body with a radially external running surface, an inner circumferential surface and an upper and lower face, and which possesses at least two slide ribs, which may be provided with a wear-resistant layer, such ribs becoming conically thinner, in the radial direction of their end faces, and which are opposite a sliding mating surface, such that they proceed from the body, at a specifiable angle, in order to form an angled side face, so that the free end of each slide rib, commencing in the region at the oil chamber side, is shaped to slope towards an area at the combustion chamber side, such that the associated transitional areas, on the one hand, from the region of the circumferential slide rib towards the angled side faces, and on the other hand, from the angled side faces to the piston ring body, are rounded, i.e. have predetermined radii.

Abstract: A compression ring assembly for a piston of an internal combustion engine includes a first compression ring and a second compression ring, with the second compression ring overlaid adjacent to and in abutting engagement with the first compression ring. When both the first compression ring and the second compression ring are uncompressed and in a free state, the second compression ring includes an outer second ring diameter that is greater than an outer first ring diameter of the first compression ring. Additionally, the first compression ring includes a first radial width that is greater than a second radial width of the second compression ring. A first gap of the first compression ring is positioned relative to a second gap of the second compression ring in a non-overlapping orientation.

Abstract: A valve for controlling a flow of granular material and fluid comprises a body having a first end, a second end, and defining an interior surface. An inlet is formed proximate the first end for receiving the granular material and fluid. An outlet is formed downstream of the inlet for selectively discharging the granular material and fluid. A first member is slideably captured within the body and a resilient member is operationally coupled to the first member. The first member is moveable between an open position at which the granular material and fluid flow through the outlet, and a closed position upstream of the outlet at which the granular material is substantially prevented from flowing through the outlet. The resilient member is moveable between a retracted position and an expanded position at which it is engaged with the interior surface to substantially prevent the fluid from flowing through the outlet.

Abstract: A piston guide ring for use in a piston-cylinder assembly includes a compatibilized polyamide-poly(arylene ether) blend. The compatibilized polyamide-poly(arylene ether) blend includes about 35 to about 95 parts by weight polyamide and about 5 to about 65 parts by weight poly(arylene ether), based on 100 parts by weight total of the polyamide and the poly(arylene ether). The piston guide rings provide improved compressive strength at elevated operating temperatures, more isotropic mold shrinkage, and reduced moisture absorption compared to piston guide rings prepared from polyamide.

Abstract: A piston rod and cylinder seal device includes a cylinder defining a piston chamber extending between first and second cylinder heads. The second cylinder head has a spud receiving bore, a pressure passage communicating with the spud receiving bore, and a bore supply/vent passage. A piston is disposed in the piston chamber. A piston rod is connected to the piston having a piston rod spud including a shaft receiving bore. A tubular shaft connected to the second cylinder head in the spud receiving bore has a passage communicating with the bore supply/vent passage. The shaft is sealingly received in the shaft receiving bore when the piston rod spud is received in the spud receiving bore preventing pressurized air in the bore supply/vent passage from entering the spud receiving bore. The shaft is positioned outside the shaft receiving bore when the piston rod spud is outside the spud receiving bore.

Abstract: An oil scraper piston ring includes a ring body having two radial outer running webs on the ring body, which are arranged one behind the other in relation to the run direction of the piston and are spaced apart from one another by an external depression. Each running web respectively has two scraper lips and a wear protection coating is provided on each scraper lip.

Abstract: A piston ring, in particular a compression piston ring, includes a running surface, upper and lower flank areas, an inner peripheral area and a joint. The wall thickness of the piston ring is uniform over its periphery and at least the running surface is provided with a PVD coating or a CVD layer in such a manner that the running surface layer has a lesser layer thickness in the peripheral area close to the joint than in the remaining peripheral area of the running surface.

Abstract: An assembly is disclosed for sealing the sliding interface between two objects capable of sliding or moving with respect to one another, but where the sliding interface must provide a substantial seal against pressure loss therethrough, such as where an assembly seals the sliding interface between a piston and a cylinder or between a rod and a bushing. Although some features of this invention would be beneficial in applications using a liquid lubricant, the invention is particularly beneficial in applications not using a liquid lubricant, where the materials of the piston, cylinder, and sealing system are chosen additionally for their ability to provide self-lubrication as they slide over each other, while providing low friction and a low wear rate during sliding.

Abstract: There is provided a piston ring which can effectively prevent aluminum adhesion phenomenon to the piston ring. The piston ring includes a piston ring main body and a surface coating film on either upper or lower surface of the piston ring main body, or both the upper and lower surfaces of the piston ring. The surface coating film includes heat-resistant resin and copper based powder contained therein.

Abstract: The invention relates to a gliding element of an internal combustion engine, especially a piston ring, having a DLC coating of the ta-C type which has at least one residual stress gradient, a negative residual stress gradient being present in a center region (II) of the coating, when seen from the outside to the inside, said gradient being preferably smaller than in an inner region (III), the inner region (III) having a smaller layer thickness than the center region (II).

Abstract: A piston assembly, comprising: a back plate with an axially extending extrusion continuously circumferentially disposed about the back plate; a piston including an indent circumferentially disposed proximate an outer circumference for the piston plate; and a sealing element at least partially disposed in the indent. The piston is fixed to the back plate with a plurality of extruded rivets such that the extrusion forms a liquid-tight seal against a surface of the piston. The indent is open in an axial direction facing the back plate. The extrusion is radially inward of the plurality of extruded rivets.

Abstract: A method and device are provided for sealing a first oil environment, which is located on a first side of a movable piston guided in a hollow chamber, from a second oil environment, which is located on a second side of the piston. The piston can move back and forth in the hollow chamber between the two oil environments in the axial direction by a piston stroke length (d). Two annular seal elements are disposed around the movable piston so as to sealingly contact the inner circumferential wall of the hollow chamber. The annular seal elements are spaced from each other by at least a distance (D) in the axial direction that is greater than or equal to the piston stroke length (d).

Abstract: A magnetorheological (MR) piston ring includes an MR-piston-ring body disposable within a cylinder of an MR damper along a central longitudinal axis. The MR-piston-ring body has a radially inner surface defining a boundary of a longitudinally-extending MR passageway. The MR-piston-ring body includes a surface portion which is slidingly engagable with the cylinder and which has first and second longitudinal ends. The surface portion includes at least one surface groove each defining a secondary MR passageway and extending between the first and the second longitudinal ends. The surface groove is substantially straight and tilted with respect to a line drawn on the surface portion parallel to the central longitudinal axis. An MR damper including the MR piston ring is also described.

Abstract: A steel material composition in particular for manufacturing piston rings and cylinder liners, which has a good nitriding capability, contains the following elements in the given proportion related to 100% by weight of the steel material composition: 0.5-1.2% by weight C, 4.0-20.0% by weight Cr, 45.30-91.25% by weight Fe, 0.1-3.0% by weight Mn, 0.1-3.0% by weight Mo, 2.0-12.0% by weight Ni, 2.0-10.0% by weight Si and 0.05-2.0% by weight V. It can be manufactured by manufacturing a melt of the starting materials and casting the melt into a prefabricated mould. Nitridation of the steel material composition which is obtained leads to a nitridized steel material composition which, by virtue of the manufacture with gravity casting, exceeds the properties of tempered cast iron with nodular graphite.

Abstract: A steel piston ring and a steel cylinder liner are described which comprise as the main body a steel composition which has good nitridability. The steel composition consists of the following elements: 0-0.5 weight % B, 0.5-1.2 weight % C, 4.0-20.0 weight % Cr, 0-2.0 weight % Cu, 45.30-91.25 weight % Fe, 0.1-3.0 weight % Mn, 0.1-3.0 weight % Mo, 0-0.05 weight % Nb, 2.0-12.0 weight % Ni, 0-0.1 weight % P, 0-0.05 weight % Pb, 0-0.05 weight % S, 2.0-10.0 weight % Si, 0-0.05 weight % Sn, 0.05-2.0 weight % V, 0-0.2 weight % Ti and 0-0.5 weight % W. The steel piston ring and the steel cylinder liner can be manufactured in a casting process using the machinery and technology employed for the manufacture of cast iron parts.

Abstract: The present invention relates to a piston ring (10), particularly a compression ring, for an internal combustion engine, comprising a ring-shaped body (11) having a ring joint (13) formed by butt ends (14a, 14b), the ring-shaped body (11) further having a ring contact face (12) along its perimeter, for contacting a cylinder wall in operation. According to the invention, the ring contact face (12) has a barrel-shaped profile, the barrel-shaped profile having in any of its cross-sections an area of maximum curvature, whose radius of curvature increases in the direction of the butt ends (14a, 14b).

Abstract: The invention relates to a die casting ring (1) internally fitted with radial teeth (11) to be engaged into matching seats (22) provided on a piston (2). This piston-ring assembly prevents mutual rotation or axial translation, in addition to ensuring an optimal seal against infiltration of liquid metal during the die casting process. When the ring has a cutout (10), it can be mounted accurately onto the piston because the teeth (11) allow the cutout to be positioned anywhere relative to the piston.

Abstract: To prevent breakage of a sealing device having a main sealing body installed within an annular installing groove (31) formed in one member (3) to slidably and concentrically contact with the other member (2) and a backup ring (12) arranged at a non-sealing space side of said main sealing body, a height (h1±?h1) of said backup ring (12) in a facing direction of a bottom surface (31a) of said installing groove (31) to the other member (2) is greater than a facing distance (L±?L) between the bottom surface (31a) and the other member (2), and said backup ring (12) has a cross-sectional shape which is symmetrical in a thickness direction thereof, and has an easily compressible part (12a) which can be compressed to the extent of the difference (x) between said height (h1±?h1) and said facing distance (L±?L).

Abstract: In a method for coating a sliding element, in particular a piston ring or a cylinder liner of an internal combustion engine, DLC phases are embedded into a hard material layer as said hard material layer is deposited. A sliding element, such as a piston ring or a cylinder liner of an internal combustion engine, comprises a hard material layer with embedded DLC phases.

Abstract: The piston seal member is formed of a crosslinked rubber composition, the rubber composition including 100 parts by weight of an ethylene-propylene rubber, 20 to 60 parts by weight of a first carbon black, 50 to 100 parts by weight of a second carbon black, and 5 to 20 parts by weight of carbon nanofiber having an average diameter of 0.5 to 500 nm, the total amount of the first carbon black and the second carbon black being 70 to 160 parts by weight. The first carbon black has an average particle diameter of 35 to 100 nm and a DBP absorption of 50 to 200 ml/100 g. The second carbon black has an average particle diameter that is greater than the average particle diameter of the first carbon black and ranges from 60 to 500 nm and a DBP absorption of 5 to 50 ml/100 g.

Abstract: A shaft seal of the rotating wheel shaft of a turbomachine includes a rotating wheel-side seal and a bearing-side seal between the bearing housing and the shaft. An oil outlet chamber is arranged between the rotating wheel-side seal and the bearing-side seal. The oil outlet chamber is delimited by a third seal between the bearing housing and the shaft, and a gas discharge chamber is arranged between the third seal and the rotating wheel-side seal. The construction is actively cooled by means of at least one splash oil bore in the region of the oil drain channel, as a result of which coking of the shaft seal can be prevented. The third seal separates the oil issuing from the oil outlet chamber from the gas issuing from the gas discharge chamber.

Abstract: The present invention provides a seal ring which can be prevented from being broken by an expansion and a shock applied thereto when the seal ring is fitted on a rotary shaft and does not have a configurative disadvantage such as a burr. Therefore no post-processing is required. The present invention also provides materials of the seal ring and a method of manufacturing the seal ring. The seal ring is made of resin and having two abutments confronting each other and a gate mark formed in an injection molding operation.

Abstract: A combination oil ring prevented from freeze up of the side rails and spacer expander, that is, a combination oil ring of the present invention provided with a top and bottom pair of side rails 11 and 12 and a spacer expander 13 having large numbers of top pieces 14 and bottom pieces arranged separated in the axial direction and circumferential direction and alternating in the circumferential direction, connecting pieces 16 connecting adjoining top pieces 14 and bottom pieces 15, and ear parts 17 and 18 formed rising up at the inner circumference side ends of the top pieces 14 and bottom pieces 15 for pushing against the side rails 11 and 12, in which combination oil ring 10, grooves 19 and 20 are formed in at least one surfaces of top surfaces of the top pieces 14 and bottom surfaces of the bottom pieces 15, and through holes 17a and 18a by which the grooves 19 and 20 are communicated are formed in the ear parts 17 and 18.

Abstract: Piston ring for an internal combustion engine, comprising a running surface, and upper and a lower flank surface and an inner circumferential surface, wherein at least one of said surfaces is provided with at least one marking which is formed in the manner of a matrix, characterized in that the surface region which contains the marking is of brighter configuration in order to produce a background surface for the matrix than the surface regions of the piston ring which immediately adjoin in at least outside the matrix.

Abstract: A pressure balance seal includes a sealing surface facing an inward radial direction, and a stator interface comprising at least one surface interfacing with a stator. The pressure balance seal further includes a friction reducing feature. The friction reducing feature includes a cavity on the sealing surface. The cavity is configured to receive a fluid such that a normal force acting on the pressure balance seal is counterbalanced by a force generated by a pressure of the fluid.

Abstract: A wire material for a coil expander capable of manufacturing a coil expander that is unlikely to cause disadvantages such as abnormal wear and resultant reduction in strength The wire material for a coil expander is used for a coil expander of a combination piston ring having a piston ring and the coil expander for pressing and urging the piston ring outward in the radial direction thereof, wherein a cross-sectional shape thereof is a rectangular shape, and when the coil expander is formed by using the wire material for a coil expander, the surface of the wire material for a coil expander, constituting an outer peripheral surface of the coil expander, is formed into a convex curved shape.

Abstract: A structured chromium solids particles layer with a network of cracks in which solids particles are embedded, wherein the crack density is 10-250 per mm, the particle size of the solids particles lies in the range of from 0.01-10 ?m, the proportion of solids particles in the overall layer is 1-30 vol.-% and the chromium solids particles layer has a microstructure with depressions in the surface of the layer, wherein the proportion of the surface area accounted for by the depressions is 5-80%. A method for producing the structured chromium solids particles layer on a workpiece includes introducing the workpiece into an electrolyte containing a Cr(VI) compound and electrolytically depositing a chromium layer at a current density of 20-100 A/dm2 and a current yield of 12% or less and then reversing the current direction wherein the solid particles are embedded within the network of cracks.

Abstract: In ported engine constructions, cooling of piston crowns and cylinder liners results in reduction or elimination of bore/liner distortions, thus ensuring circularity of the bore/piston interface throughout engine operation. Consequently, the need for heavily-tensioned piston rings is eliminated. Such engine constructions incorporate annular low-tension compression seals on the pistons, which substantially reduce port bridge wear during all phases of engine operation while also limiting blow-by during combustion.

Abstract: A sealing structure is provided wherein an annular groove formed in a pump cylinder of a piston pump receives therein a seal ring made of a synthetic resin material and having an inner circumferential surface fluid-tightly contacting an outer circumferential surface of the pump piston and an O-ring arranged on the outer circumferential side of the seal ring and urging the seal ring radially inward. The seal ring is formed at its axial end portions with flange portions for preventing the O-ring from coming off. In the state that the seal ring and the O-ring are fitted in the annular groove, the flange portions do not receive a load from the O-ring, and a surface pressure which the seal ring applies to the outer circumferential surface of the piston at an axial center portion thereof is set to be higher than surface pressures which it applies to the outer circumferential surface of the piston at axial end portions thereof.

Abstract: A method for producing a dispersion-hardened object which contains carbide nanoparticles comprises producing an object by means of a thermal spraying method, wherein downstream of the combustion chamber, the gas flow is supplied by means of a carrier gas with at least one precursor which reacts in the gas flow to form a carbide, or carbide nanoparticles are supplied via an external nanoparticle generator which is subject to a thermal load. It allows the production of a dispersion-hardened object such as, for example, a component for an internal combustion engine, for example a piston ring. The method is carried out by means of a thermal spraying device which, downstream of the combustion chamber, besides at least one line for supplying a thermal spray powder, further comprises at least one line for supplying a precursor by means of a carrier gas.

Abstract: A piston assembly for use in a viscous material dispenser is disclosed. The assembly has a main body with an axial bore for receipt of a push rod. The body has a face including an annular recess and an endless lip surrounding the recess. A camming washer is disposed at least in part in the recess. The washer includes a perimeteral camming surface engageable with the lip. The body and washer are connected together for limited relative axial movement when the piston assembly is advanced against material in a cartridge to dispense such material. The relative movement is effective to cause the camming surface to force the lip outwardly into tight engagement with a wall of such a cartridge.

Abstract: A piston seal (50) of a liquid-operated cylinder includes a main seal ring (51) that slidably contacts the inner circumferential surface (11) of the cylinder tube (10); an O-ring (52) that imparts a force causing an outer circumference of the main seal ring (51) to move closer to the inner circumferential surface of the cylinder tube (10) by pressing onto an inner circumference of the main seal ring (51); and a sub-seal ring (53) that is disposed parallel to the main seal ring (51) at a position further toward the cushion pressure chamber (6) and is pressed by the main seal ring (51), as pressure from the drive pressure chamber (5) is applied to the main seal ring (51), to slidably contact the inner circumferential surface of the cylinder tube (10).

Abstract: There is provided a slide part used in an environment where there is a lubricant containing a molybdenum compound including a hard protective layer formed on an outermost surface of a substrate of the slide part; in which: the hard protective layer includes mainly carbon, nitrogen, and a metal element; the hard protective layer is composed of a complex of an amorphous carbon body containing nitrogen and a compound crystal of the metal element; the compound crystal is composed of at least one of a metal carbide, a metal nitride, and a metal carbonitride; and a surface hardness of the hard protective layer is 1800 or larger in Vickers hardness.

Abstract: A piston ring material is provided which retains excellent mechanical properties and processability, which are required of piston ring materials, and has wearing resistance and scuffing resistance, which are sliding properties required of piston rings. The piston ring material, which is for use in internal combustion engines, contains, in terms of mass %, 0.3-0.8% carbon, 0.1-3.0% silicon, 0.1-3.0% manganese, 0.01-0.3% sulfur, 0.1-2.0% chromium, and 0.05-2.0% the sum of titanium and/or zirconium, with the remainder being iron and incidental impurities. The titanium and/or zirconium contained in the piston ring material and the sulfur contained therein satisfy the following relationship. [Ti (%)+½Zr (%)]/S (%)?5.0 Preferably, the material may contain one or more members selected from up to 1.0% copper, less than 3.0% molybdenum, up to 1.0% aluminum, and less than 2.0% nickel, in terms of mass %.

Abstract: A ported cylinder for a diesel engine includes a circular groove in the bore, located on the outside of respective port. An oil wiper ring or a group of oil wiper rings is seated in the circular groove for wiping excess lubricating oil from a piston surface. A compressing ring is disposed between the oil wiper ring or group of oil wiper rings and the floor of the circular groove to urge the oil wiper rings into contact with the piston surface. An oil wiper ring construction includes a major surface with oil-conducting channels.

Abstract: The hydraulic cylinder having a portion on a side of a lip tip end of an annular clearance between an inner circumferential face of a shaft hole of a cylinder and a piston is made up of a minute clearance in order to suppress protrusion of the lip, wherein an annular clearance area for suppressing occurrence of the cavitation and for shortening an axial distance of the annular clearance portion made up of the minute clearance is formed on an opposite side of the annular clearance portion from a mounting groove.

Abstract: The invention provides a seal for sealing between two members (1, 3) which are mutually movable so as to slide relative to each other. One of the members comprises a body (3) with a channel (2) formed therein. The channel (2) has a longitudinal axis and the other member (1) is receivable in the channel (2) so that the two members (1, 3) slide relative to each other in a direction parallel to the longitudinal axis. The first member (1) has at least one deformable plastics rib (4, 5, 6, 7, 8, 30, 34) formed on a surface thereof. The rib (4, 5, 6, 7, 8, 30, 34) faces the second member (3) and in use deforms on abutment with the wall of the channel (2) of the second member (3) to provide a seal between the two members (1, 3) when they are stationary or moving relative to one another. An endless plastics skirt (22) may be provided around the external surface of the first member (1) with the rib (4, 5, 6, 7, 8, 30, 34) being formed around the external surface of the skirt (22).

Abstract: A steel product having a composition which contains by mass C: 0.01 to 1.9%, Si: 0.01 to 1.9%, Mn: 5.0 to 24.0% with balance consisting of Fe and unavoidable impurities and a steel product described above which further contains Cr: 18.0% or below and/or Ni: 12.0% or below in addition to the above essential elements. The above steel products may each further contain Al: 1% or below and/or N: 0.3% or below and the above steel products may each further contain one or more elements selected from among Nb, Ti, Zr, Mo and Cu in a total amount of 4.0% or below. The steel products can sufficiently follow the thermal expansion of a cylinder made of an aluminum alloy and thus enables the production of a piston ring which is suitable for use as a piston ring to slide on the inner face of a cylinder bore made of an aluminum alloy in an internal combustion engine and which can retain excellent sealing properties.

Abstract: A method of manufacturing an oil ring is disclosed. The oil ring includes an annular oil ring body having a pair of rail portions at its axially upper and lower portions and butt ends, and a coil expander assembled in the inner periphery of the oil ring body. A number of oil ring bodies and annular spacers having a smaller diameter than the oil ring bodies are stacked, and then aligned and retained using a jig such that an outer periphery of the oil ring bodies becomes a circle. The aligned oil ring bodies are rotated and a flat region that is substantially level with respect to the outer peripheral sliding surface of the plurality of oil ring bodies is formed. Curved regions extending on both sides of that flat region are formed using a buff or an elastic grindstone.

Abstract: The invention relates to a steel material having a high silicon content, and to a method for the production thereof, the steel material being particularly suitable for piston rings and cylinder sleeves. In addition to iron and production-related impurities, the steel material contains 0.5 to 1.2 wt. % carbon, 3.0 to 15.0 wt. % silicon and 0.5 to 4.5 wt. % nickel. Also, the steel material can contain small amounts of the following elements Mo, Mn, Al, Co Nb, Ti, V, Sn, Mg, B, Te Ta La, Bi, Zr, Sb, Ca, Sr, Cer, rare earth metals and nucleating agents such as NiMg, MiSiMg, FeMg and FeSIMg. due to the high Si content, a degree of saturation higher than 1.0 is attained, with the melting temperature of the steel material corresponding to normal cast iron. The steel material can be produced according to a conventional cast-iron technique and has a high resistance to wear and tear and a high structural strength (minimal distortion).

Abstract: The invention relates to a pneumatic component with a cylinder (12); a piston (14) running in the cylinder and a grooved ring (16), which seals the piston (14) from the cylinder (12) and has a static side (Sstat) and a dynamic side (Sdyn). According Co the invention, the grooved ring (16) has at least two concentric microlips (38) on the static side (Sstat).

Abstract: Provided is a wire rod for an I-type oil ring, which includes right and left rail portions and a web portion connecting the rail portions, which has an oil hole or a molten through hole formed in the web portion, and which has a circumscribing circle diameter of 10 mm or less in its transverse contour. The molten through hole has such a remolten portion formed on its exit side as encloses the exit of the molten through hole. The remolten portion exceeds such a molten portion in the transverse section along the center of the molten through hole as is formed in the molten through hole, and is formed to have 200 ?m or less from the outer circumference of the molten through hole and 100 ?m or less in the depth direction of the molten through hole.