Abstract: A belt reinforcing layer is disposed outwardly in the radial direction of a tire so as to reinforce the whole portion or the end portions of a tread portion. The belt reinforcing layer is formed by spirally winding a rubber-coated and narrow strip made of a fiber cord/cords around a tire. A pair of bead fillers are disposed directly above bead cores of a pair of bead portions. The cords of the belt reinforcing layer are made of organic fiber cords, and have a 2.7% or less elongation under load of 1.4g/d at the temperature of 50±5° C., and have a 1.5 to 6.0% elongation under load of 0.7g/d at the temperature of 170±5° C. The height L of each of the bead fillers corresponds to 20 to 60% of the cross sectional height T of a tire.

Abstract: Disclosed is a pneumatic tire which comprises a carcass layer provided between a pair of left and right bead sections, left and right side wall sections interpolated for connecting the pair of left and right bead sections with a tread section to be continuous, and at least two belt layers provided in an outer peripheral side of the carcass layer in the tread section, each of the belt layers being composed of a plurality of reinforcing cords coated with coating rubber. Storage elastic modulus E′ of the coating rubber is set in a range of 15.0 to 40.0 MPa, and its loss tangent tan &dgr; is set in a range of 0.1 to 0.25. Interlayer rubber is provided between end parts of the belt layers, the interlayer rubber being specifically set in each of both end parts thereof in a tire width direction, and elongation to break Eb of the interlayer rubber is set in a range of 400 to 700%.

Abstract: A pneumatic tire has a sidewall rubber insert axially inward of at least one carcass ply. Such insert may, for example, be an apex extending radially outward from the bead core region of the tire into the tire sidewall. Alternatively, it may be positioned higher in the sidewall portion of the tire and away from the bead core. Such insert is a rubber composition containing a dispersion of an ultra high molecular weight polyethylene and a dispersion of a starch composite.

Abstract: A tire wherein the reinforcing cords of the carcass, in the part situated between the anchoring zone of the carcass and the sidewall, are in contact with at least one layer of cushion compound having a high modulus of elasticity on the axially outer side and a low modulus of elasticity on the axially inner side and in the sidewall.

Abstract: A pneumatic tire (10) has a pair of sidewall portions (20), a pair of bead regions (22) and a carcass (30) reinforced with at least two sidewall fillers or inserts (42), (46) for each sidewall portion and at least one cord reinforced ply (38) and two bead cores (26) one in each bead region and a reinforcing belt structure (36). This tire is preferably a runflat radial ply tire. The at least one cord reinforced ply (38) has a pair of turnup ends (32) wrapped around the pair of bead cores (26). The turnup ends (32) each extend radially outwardly to a terminal end (33) at a radial height of at least 40% of the tire section height (SH). The first insert for each sidewall portion lies radially inward and adjacent the at least one ply (38). The second insert (46) for each sidewall portion is a bead filler insert radially above the bead core (26) and between the at least one ply (38) and its turnup end (32).

Abstract: A heavy duty radial tire having improved bead durability accommodated to a standard 15 degree taper center drop rim comprises a pair of bead cores disposed one in each bead portion, a steel cord radial carcass ply turned up around the bead cores from the axially inside to the outside, a hard rubber bead apex disposed between the carcass ply main portion and each turnup portion, a bead reinforcing layer of reinforcing cords disposed axially outside each carcass ply turnup portion, and a rubber strip disposed between each turnup portion and the bead reinforcing layer, the rubber strip being harder than the bead apex, and the difference B-D of the inside diameter B of the bead cores from the rim diameter D of the rim is in the range of from -4 to 1 mm.

Abstract: A rubber element for tire comprising a bead core which is generally an annular shape, and an apex which is generally an annular shape and attached to the bead core. The apex comprises a first portion whose sectional configuration is generally a rectangle, and a second portion whose sectional configuration is generally a semiellipse and integrally molded on an outer face of the first portion. An inner face of the first portion of the apex is attached to an outer face of the bead core, whereby the apex and the bead core are united.

Abstract: An improved tire 200 having precured tire tread 10 for mounting to an unvulcanized or a vulcanized tire casing 100 is disclosed. The improved precured tread 10 has a pair of circumferentially continuous projections 60. One projection 60 extends axially outwardly from each of the lateral surfaces 40,50 of the tread. The projection 60 provides a means for air tightly sealing the tread casing assembly at the lateral surfaces 40,50 during the vulcanization of the tread 10 to the casing 100. The method of assembly includes placing the tread 10 and casing 100 in a smooth mold, closing the mold inflating a bladder expanding the casing 100 into the tread 10, the tread 10 correspondingly expands effecting an air tight sealing of the tread 10 and the mold at the annular projections 60 of the tread 10, applying heat and pressure causing a uniform flow of unvulcanized material radially outwardly along the tread edges.

Abstract: A pneumatic tire and a method of manufacturing the tire are disclosed, wherein the tire comprises a carcass ply turned up around a bead core in each bead portion, and a rubber bead filler disposed between the turnup portion and main portion of the carcass ply and extending radially outwardly from the bead core beyond the maximum section width point of the tire, the bead filler comprising a radially inner part preferably made of a bead apex rubber tapering radially outwardly from the bead core and a radially outer part preferably made of a strip of hard rubber having a substantially constant thickness and a JIS-A hardness of 75 to 95 degrees, the radially outer end of the bead apex rubber being lower than the radially outer end of a flange of a standard rim.

Abstract: In a pneumatic radial tire for trucks and buses mounted on an approved 15.degree. drop center rim, an outer surface portion of a composite side-rubber and/or an envelope surface of the bead core among members constituting the bead portion of the tire has a curved shape concavedly directed toward the outside of the tire at a region opposite to an inner curved surface of a slantly rising portion in a flange of the approved rim.

Abstract: A runflat radial ply passenger or light truck pneumatic tire 10 has a carcass 30 reinforced with at least one sidewall insert or filler 42 and one substantially inextensible cord reinforced ply 38, the ply being wrapped about two bead cores 26 and located radially inward of a belt reinforcing structure 36. The sidewall insert or filler 42 is located radially inward of the ply 38. The cord 43 has a minimum modulus E of 10 Gpa and is generally inextensible and less heat sensitive than conventional synthetic cords used in passenger and light truck tires.

Abstract: A rubber filler in the tire bead portions is formed by a hard rubber filler having JIS A hardness of at least 85, and a soft rubber filler having JIS A hardness of 65-75. An outer end C of the interface between the hard and soft rubber fillers is placed to be higher than the upper end of a rim flange and at least 10 mm lower than an end D of a turned-up steel cord carcass, in a cross section of the bead portion of the tire. Further, 1.0 La.ltoreq.Lb.ltoreq.2.0 La, where Lb represents the distance B-E from an inner-surface-side end B of the interface between a rubber bead cover and carcass topping rubber of a carcass ply to an inner-surface-side end E of the interface between the hard and soft rubber fillers, and where La represents the distance D-A from the end D of the turned-up carcass to an outer-surface-side end A of the interface between the rubber bead cover and the carcass topping rubber.

Abstract: The run-flat tire has a tread for contacting a ground surface and a belt package with belt plies interior to the tread for support of the tread. A plurality of radially reinforced carcass layers are positioned interior to the belt plies and include at least one carcass layer that extends between spaced apart annular beads. The tire has a pair of sidewalls each extending radially inward from shoulders at lateral edges of the belt package to the annular beads. The sidewalls have a plurality of sidewall stiffening members to support the tire during a loss of inflation pressure. The carcass layers are disposed with the sidewall stiffening members to help support the run-flat tire with a loss of inflation pressure.

Abstract: A pneumatic tire having an aspect ratio of not more than 55% comprises a carcass composed of a single carcass ply, in which a turnup end portion of the carcass ply is disposed between an end portion of a belt and a crown portion of the carcass ply, and distances L.sub.1 and L.sub.2 from a central position of a bead core to an outer end of a bead filler and to a maximum width of the carcass in the radial direction of the tire satisfy a relationship of L.sub.1 .gtoreq.L.sub.2 and within given ranges with respect to a section height (H) of the tire, respectively.

Abstract: At least one reinforcing rubber layer is provided in the part of each of two side wall portions which is on the outer side of a carcass layer. The outer circumferential end portions of the reinforcing rubber layers extend to positions in which they are disposed between the end portions of the innermost belt layer and the corresponding portions of the carcass layer, while the inner circumferential end portions of these rubber layers extend inward in the radial direction of the tire so as to overlap the bead fillers in positions on the outer sides of the end portions of the carcass layer in the widthwise direction of the tire. A 100% modulus at 100.degree. C. of the rubber constituting the reinforcing rubber layers is not higher than that of the rubber of the belt layers, and a dynamic elastic modulus at 20.degree. C. of the former rubber in the range of 10-40 MPa.

Abstract: A pneumatic radial tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass of at least one rubberized ply containing cords arranged in a radial direction and consisting of a main carcass body and a turnup portion. A belt is superimposed about a crown portion of the carcass, and a rubber filler is arranged between the main carcass body and the turnup portion above the bead core. The rubber filler is composed of three different rubber stocks, and a hardest rubber stock among these rubber stocks is arranged in at least an outer zone in the radial direction of the tire sandwiching a normal line drawn from the turnup end to the outer surface of the main carcass body at a cross section of the tire and perpendicular to the main carcass body. A rubber stock having a middle hardness is arranged between the outer surface of the main carcass body and the hardest rubber stock as a stress-mitigating rubber layer.

Abstract: A runflat radial ply pneumatic tire 10 has a carcass 30 which has a pair of sidewalls 20, each sidewall being reinforced with at least two sidewall fillers or runflat inserts 42, 46 and at least two cord reinforced plies 38, 40 and a bead core 26. The tire has one or more reinforcing belts 36. Each sidewall has at least one ply 38 or 40 reinforced with cords, the cords have a modulus E of X, X being at least 10 GPa. At least one ply has a turnup end 32 wrapped around the bead core 26. A second ply 38 or 40 is reinforced with substantially inextensible cords having a modulus E greater than X of the cords of the other ply. The second ply 38 or 40 is spaced from the first ply 38 or 40 by the second filler or runflat insert in the sidewall 20.

Abstract: The run-flat tire has a tread for contacting a ground surface and a belt package with belt plies interior to the tread for support of the tread. A plurality of radially reinforced carcass layers are positioned interior to the belt plies and include at least one carcass layer that extends between spaced apart annular beads. The tire has a pair of sidewalls each extending radially inward from shoulders at lateral edges of the belt package to the annular beads. The sidewalls have a plurality of sidewall stiffening members to support the tire during a loss of inflation pressure. The carcass layers are disposed with the sidewall stiffening members to help support the run-flat tire with a loss of inflation pressure.

Abstract: A belted tire, especially for motor vehicles, has an inner carcass ply, the end portions of which extend from the inner surface of the tire, about an annular bead core, toward the outer surface of the tire. To form a connection point, the end of the outer section of the carcass ply is placed against the inwardly disposed section. The carcass ply approaches the bead core essentially tangentially, and is disposed thereabout. Between the bead core and the connection point, the two carcass ply sections extend linearly and have essentially the same length.

Abstract: The run-flat tire of this invention includes a pair of bead regions, a crown region with a tread and a tread reinforcing package including a cap ply and self supporting sidewalls between each bead region and the crown region. An innerliner ply maintains air within the inflated tire. The self supporting sidewalls each include a first crescent-shaped reinforcing member, an inner carcass layer, an inner sidewall supporting complex and an outer sidewall and bead protecting complex. The supporting sidewalls effectively have a plurality of crescent-shaped reinforcing members and a plurality of carcass layers. The sidewall supporting complexes are realized by providing first and second partial carcass layers along with a filler rubber portion and a second crescent-shaped reinforcing member, which can be formed by a separate tire building operation. The sidewall protecting complexes can be formed in a similar operation.

Abstract: A heavy duty radial tire is to be mounted on a 15 degree drop center rim. In a mounted state that the tire is mounted on the rim and inflated to 0.5 ksc but not loaded, the inside diameter BC of the bead cores at the radially innermost point thereof is set to being not more than the diameter BT at the heel point of the bead portions. In a demounted state that the tire is demounted from a rim, the bead bottom is tapered towards the axial inside of the tire at an angle .theta. of from 1.0 to 1.9 times the angle .alpha. of the tapered bead seat of the rim. In the mounted state, the bead core has a radially inner surface tapered at the substantially same angle as the bead seat, and the axial distance BP of the axially inner end of this tapered inner surface from the bead heel point is set in the range of from 1.3 to 2.1 times the maximum width BW of the bead core measured in the direction parallel to the bead seat.

Abstract: A motorcycle tire comprises a tread reinforced between its edges by a breaker assembly and having in its normally inflated fitted condition a camber value C/L of between 0.5 to 0.7, a reinforcing carcass ply of rubber covered cords radially inside the breaker assembly and extending between two bead regions and wrapped in each bead region around an annular bead core to form carcass ply turn-ups, and tire sidewalls between the tread edges and bead regions, wherein under the tread is disposed radially inward of the breaker assembly a secondary carcass ply of rubber covered cords and between the carcass ply and the secondary carcass ply is disposed a rubber member extending from tread edge to tread edge.

Abstract: An airplane tire with radial carcass reinforcement (3) comprising at least one ply of turned-up textile cords (3A, 3B, 3C), wound around an axially inner bead ring (T.sub.2) extending axially from the inside to the outside in order to form an axially outer turn-up (30A, 30B, 30C), at least one ply (3D, 3E) of textile cords wound around an axially outer bead ring T.sub.1 extending from the inside to the outside to form a turn-up (30D, 30E), characterized by the fact that the turn-up (30A) of the axially innermost ply (3A) is separated, over a certain radial portion, from the carcass ply (3D) by a profiled member (4) of rubber mix in crescent shape, the maximum thickness e.sub.4 of which is at least equal to 0.5 times the total thickness t of the turn-ups (30A, 30B, 30C) of carcass plies (3A, 3B, 3C) turned-up around the axially inner bead ring T.sub.2.

Abstract: A pneumatic tire for a two-wheeled vehicle has a hard rubber layer having a Shore A hardness of 60.degree. to 90.degree. arranged along the outside of the turn-up portion of a carcass, wherein a ratio (a/H) is within the range of 0.1 to 0.7 in which (a) is the height of the outer end in the tire radial direction of the hard rubber layer measured from the height of a flange of a rim on which the tire is assembled, and (H) is the height of the tread edge of the tread portion measured from the same, and wherein the inner end in the tire radial direction of the hard rubber layer is located inward of the flange height of the rim.

Abstract: A heavy duty pneumatic radial tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions containing a pair of bead cores therein, at least one radial carcass ply, and a bead filler comprised of at least two rubber stocks, in which at least a part of an outer surface of a turnup portion of the carcass ply in axial direction of the tire is covered with a deformation-absorbing rubber layer arranged along an upper rubber stock of the bead filler and having a Shore A hardness of not more than 55.degree..

Abstract: A pneumatic radial tire comprises a pair of bead cores, a carcass extending toroidally between the bead cores, a stiffener disposed one on each of bead cores and a belt comprising rubberized cord plies and disposed on a crown portion of the carcass, wherein the rubberized cord plies comprise a first rubberized ply having steel cords inclined with respect to the tire equatorial plane and at least one second rubberized ply having organic fiber cords extending substantially in parallel with the tire equatorial plane, the relation between the height H of the stiffener in the radial direction and the section height SH of the tire is given by 0.4 SH.ltoreq.H.ltoreq.0.6 SH, and the average thickness d of the upper portion of the stiffener defined between a height corresponding to 0.35 SH and the top of the stiffener is given by 0.5 mm.ltoreq.d.ltoreq.0.2 D where D is the thickness of the stiffener at the bottom portion adjacent to the bead core.

Abstract: A pneumatic radial tire, particularly a large-size and low-section profile pneumatic radial tire for truck and bus includes a stiffener disposed between a main body portion and each turnup portion of a carcass and constructed with a one-piece molded body of two or more rubber compositions having different hardnesses. A rubber composition having a highest hardness is arranged near to the main body portion of the carcass as a deformation-isolating rubber member having a greatest thickness at a position separated from a perpendicular line (Lv) drawn from an end of the turnup portion toward an outer surface of the carcass main body portion in tire cross-section, at least in a side of the tread portion among both sides sandwiching the perpendicular line (Lv), and a rubber composition having a lower hardness is arranged along an inner surface of the turnup portion.

Abstract: A pneumatic radial tire comprises a pair of bead cores, at least one radial carcass ply comprised of a main body and a turnup portion, and a stiffener arranged between the main body and each turnup portion wound around each bead core, in which each stiffener is composed of first, second and third stiffener members, and a boundary surface X between the first and second stiffener members is inclined outward in the radial direction so as to approach to the main body and a boundary surface Y between the second and third stiffener members is inclined outward in the radial direction so as to separate away from the main body, and a ply end rubber member made from rubber having a hardness between the hardnesses of the first and third stiffener members is arranged on an outer end region of the turnup portion in the radial direction.

Abstract: A pneumatic radial tire comprises a radial carcass ply toroidally extending between a pair of bead cores, a stiffener disposed above each bead core between the carcass ply and its turnup portion, and a rubber chafer arranged outside the turnup portion, provided that a ratio of cross-sectional area of the stiffener to cross-sectional area of the rubber chafer is not more than 0.5. In this tire, a sidewall-reinforcing rubber layer having a JIS A hardness of not less than 80.degree. is arranged along the carcass ply in a region ranging from a crown portion of the carcass ply to the bead core.

Abstract: A pneumatic vehicle tire has two beads each having a bead core and a carcass of at least one layer anchored at the bead cores within the beads. The beads further have bead profiling members. A reinforcement structure is located radially outwardly of the carcass, and a tread is positioned radially outwardly of the reinforcement structure. The carcass is made of aramid cord fabric and the bead cores are made of aramid cords. The reinforcement structure is made of synthetic fiber-reinforced rubber or of aramid cords. The bead profiling members are made of rubber reinforced with synthetic fibers.

Abstract: A pneumatic radial tire, particularly for a construction vehicle, has a carcass ply arranged toroidally between a pair of bead cores, containing rubber coated steel cords disposed radially therein, being turned up around each bead core from the inside to the outside of the tire and the turn-up portion of which around each bead core extends to around 1/2 height of the tire height H. When the radical length of an overlapping portion of the turn-up portion of the carcass ply and the main carcass ply is h.sub.1 and the thickness of the overlapping portion is w.sub.1 within a range of .+-.0.1 H having half height H/2 of the tire height H as the center, the radial length h and the thickness w of a reinforcing rubber material arranged between the turn-up portion of the carcass ply and the main ply satisfy the following formulae(1) 0.2w.sub.1 .ltoreq.w.ltoreq.1.0w.sub.1, and(2) 0.5h.sub.1 .ltoreq.h.ltoreq.1.0h.sub.

Abstract: An improved tire 200 having precured tire tread 10 for mounting to an unvulcanized or a vulcanized tire casing 100 is disclosed. The improved precured tread 10 has a pair of circumferentially continuous projections 60. One projection 60 extends axially outwardly from each of the lateral surfaces 40,50 of the tread. The projection 60 provides a means for air tightly sealing the tread casing assembly at the lateral surfaces 40,50 during the vulcanization of the tread 10 to the casing 100. The method of assembly includes placing the tread 10 and casing 100 in a smooth mold, closing the mold inflating a bladder expanding the casing 100 into the tread 10, the tread 10 correspondingly expands effecting an air tight sealing of the tread 10 and the mold at the annular projections 60 of the tread 10, applying heat and pressure causing a uniform flow of unvulcanized material radially outwardly along the tread edges.

Abstract: The radial pneumatic tire of this invention has a reduced bead mass and improved rolling resistance. This is accomplished with less than a 5 percent reduction in the ability of the tire to sustain nominal loads and maintain tire endurance. The bead area has a profiled single bead filler that extends radially outward from the apex portion with an essentially constant thickness portion and a tapered portion. An outer filler strip extends from a point radially inward of the design rim flange near the bead core radially outward to a position near the mid height of the tire when the tire is mounted on the rim. The end result is a tire with smaller standard architectural components but very efficient load supporting and endurance capabilities. In one embodiment the outer filler strip extends radially outward beyond the radial extent of the single bead filler. In an equally effective embodiment the single bead filler extends radially outward beyond the radial extent of the outer filler strip.

Abstract: Springy fibers, when used as a fiber reinforcement in an elastomer, have been found to demonstrate reduced crack propagation in the elastomer. Springy fiber reinforced elastomers can be used in tires in various components.

Abstract: A radial tire for aircraft, which aims to prevent damage at the bead portion thereof, wherein the modulus MS of sidewall rubber at 100% elongation, modulus MS2 of 2nd stiffener rubber at 100% elongation, modulus MC of rubber chafer rubber at 100% elongation and modulus MS1 of 1st stiffener rubber at 100% elongation have the relationship of MS<MS2<MC<MS1; and a point C is located between a point A and a point B, where the points A and B are tire surface points which depart from rim flange when the tire is mounted on a normal rim and inflated at normal inflation pressure and loaded with 100% weight and 200% weight respectively of normal load, and the point C is the foot of a perpendicular to the tire surface from the radially outermost point of the 1st stiffener.

Abstract: A pneumatic vehicle tire has two beads each having a bead core and a carcass of at least one layer anchored at the bead cores within the beads. The beads further have bead profiling members. A reinforcement structure is located radially outwardly of the carcass, and a tread is positioned radially outwardly of the reinforcement structure. The carcass is made of aramid cord fabric and the bead cores are made of aramid cords. The reinforcement structure is made of synthetic fiber-reinforced rubber or of aramid cords. The bead profiling members are made of rubber reinforced with synthetic fibers.

Abstract: A vehicle tire (1), particularly for motor vehicles, defined by an outer tread (2) and two beads (3), each connected to the tread (2) by a respective annular sidewall portion (5); each sidewall portion (5) presenting an inner reinforcing cord assembly (6) defined by at least two layers (7) of reinforcing cords (8) on opposite sides of an extending outwardly of the respective bead (3), and a layer (16) of a lightweight elastomeric sponge filler material located between the two layers (7) of reinforcing cords (8), the thickness of which depends on the rigidity required of the respective sidewall portion (5).

Abstract: The bead durability of the heavy duty pneumatic radial tire for truck and bus is improved by arranging a rubber stock composed of three rubbers A, B and C each having particular properties between a carcass ply and its turnup portion in the bead portion and/or rendering the turnup portion of the carcass ply in the bead portion into a particular arrangement.

Abstract: A passenger radial tire which comprises a tread portion, a pair of axially spaced bead portions, a pair of sidewall portions extending therebetween, a pair of bead cores disposed one in each bead portion, and a carcass extending between the bead portions and turned up around the bead cores from the axially inside to the outside thereof to form two turned up portions and one main portion therebetween, wherein in at least the sidewall portions no bead apex exists to thereby the carcass turned up portions are located adjacently to the carcass main portion, and in each bead portion a bead reinforcement extending radially outwardly into the sidewall portion is disposed.

Abstract: A radial tire for motorcycle has a belt layer of cords with modulus of elasticity of 600 kg/mm.sup.2 or more wound spirally on a carcass nearly parallel to the tire equator, and a bead apex rubber disposed on a bead core between a carcass main portion extending from a tread to a bead core and a carcass turned up portion. The bead apex rubber consists of a soft apex part SA with JISA hardness of 50 to 60 degrees extending radially outward from the bead core, and a hard apex part HA with JISA hardness of 70 to 95 degrees extending radially outward from the soft apex part SA. A height h1 the soft apex part SA from a bead base is 0.20 to 0.40 times a height h0 of the tread end, and a height h2 of the hard apex part HA is 0.50 to 1.25 times the height h0 of the tread end.

Abstract: A passenger radial tire which comprises a tread portion, a pair of axially spaced bead portions, a pair of sidewall portions extending therebetween, a pair of bead cores disposed one in each bead portion, and a carcass extending between the bead portions and turned up around the bead cores from the axially inside to the outside thereof to form two turned up portions and one main portion therebetween, wherein in at least the sidewall portions no bead apex exists and the carcass turned up portions are located adjacently to the carcass man portion, and in each bead portion a bead reinforcement extending radially outwardly into the sidewall portion is disposed.

Abstract: An object of the present invention is to provide a pneumatic radial tire that has the carcass layer composed of a single ply of carcass cords to reduce the tire weight and improve the tire production rate and which insures a sufficiently high lateral spring constant to maintain good maneuverability. According to the present invention, the pneumatic radial tire comprises annular tread portions a pair of sidewalls that extend from opposite ends of the tread portion in the radial direction of the tire, a pair of bead portions that are provided at the ends of the sidewalls and each of which has a bead core embedded therein, a carcass layer composed of carcass cords that are arranged in the radial direction of the tire as they are folded around the bead core at each end and which extend through both sidewalls and tread portion, and breaker layers that are arranged in the external radial part of the carcass layer. The carcass layer is formed of a single ply of carcass cords.

Abstract: A method of forming a bead assembly for use in a pneumatic tire includes extruding a strip of green elastomeric material onto a split or pair of steel supporting guide ring where the ends of the extruded strip are cut at a bias angle and then spliced together to form an annular elastomeric member. The extruded strip and formed annular member has a pair of tapered longitudinal end members joined by a central recess. An annular tire bead is placed in radial alignment about the central recess of the annular member. Next, a segmented mandrel carrying inflatable turnup bladders is expanded outwardly, afterwhich the split guide ring is axially withdrawn. The mandrel and bladders then provide the support for the elastomeric member previously provided by the split annular ring, and traps the bead within the central recess. The two longitudinal end members of the extruded strip are then turned up about the bead by inflating the bladders to form the bead assembly, afterwhich the assembly is placed in a shaping mold.

Abstract: A tire includes a pair of axially spaced apart beads. A carcass ply extends between and is secured at axially opposite end portions to a respective one of the beads. A pair of bead fillers is also included. Each of the bead fillers is located radially outward of a respective bead. A flipper partially envelopes the bead and further engages and replaces a part of the bead filler. The flipper further includes a plurality of parallel extending reinforcing members. The flipper has a central portion located radially inward of the bead and a pair of leg portions. Each of the pair of leg portions extends radially outwardly from a bead reference. The radial extent of the leg portions is greater than a flange distance, being the radial extent of a flange of a rim, but less than the radial extent of an apex of the bead filler when the tire is properly mounted on the rim. The carcass ply turnup extends radially to approximately the height of the rim flange.

Abstract: A pneumatic tire comprising a cylindrical tread, a pair of sidewalls, bead rings, a radial carcass, rubber fillers each arranged between each turn-up portions and a main body of the carcass and extending from above the bead ring toward the tread portion such that the radially sectional shape of the rubber film becomes narrower toward the tread portion, and a pair of thick rubber reinforcement layers arranged on respective axially inner sides of the carcass in the sidewall portions.

Abstract: A pneumatic tire comprises a radial carcass of at least one carcass ply wound around each of bead cores from inside toward outside to form a turnup portion, an outer ply inclusive of the turnup portion containing cords each having a modulus of elasticity of not less than 2500 kg/mm.sup.2 and a diameter d, and a rubber stiffener arranged at its radially inward portion between the carcass ply and the outer ply. In a bead structure of such a pneumatic tire, the stiffener is divided into an inner stiffener portion and an outer stiffener portion around a specified boundary plane, and each of these stiffener portions is comprised of rubber having a given Shore A hardness, and a volume ratio of the outer stiffener portion in the stiffener is not less than 10%.

Abstract: A pneumatic radial tire for construction vehicle comprises a carcass of a radial structure comprised of at least one rubberized steel cord carcass ply body and its turnup portion, and a stiffener rubber arranged above a bead core between the carcass ply body and its turnup portion. In order to improve the bead portion durability of this tire, a cord distance between the carcass ply body and its turnup portion passes through greatest value, minimum value, maximum value and smallest value from the vicinity of the bead core outward in the radial direction of the tire and heights of the carcass ply body corresponding to the above minimum and maximum values as well as height of the turnup end measured from the base line satisfy particular relations to a flange height FH of the standard rim.

Abstract: A pneumatic tire having an annular band is provided, the annular band for reinforcing a bead portion and a sidewall portion of the pneumatic tire. In one embodiment, the annular band comprises a plurality of filaments having a high extensional modulus of elasticity and a high tenacity bonded together in a matrix of resin. Further, the annular band is cured or formed with a cross-section which tapers from the tire's bead portion to the tire's sidewall portion. Preferably, the annular band may be cured or formed in situ during the curing of the tire in which it is placed. In another embodiment, a structural element having a high resistance to compression is bonded to and circumferentially within the annular band. In a third embodiment the structural element is wedge-shaped in cross-section.

Abstract: A pneumatic radial tire having a bead portion in which at least two reinforcing layers comprising a steel cord reinforcing layer and a fiber cord reinforcing layer are arranged outer to a turnup portion of a carcass layer and are covered with a rubber stock, the bead portion being capable of exhibiting an enhanced durability.

Abstract: A tire and rim assembly including a flanged rim and a tubeless tire with 15.degree. taper bead parts. The tire includes a carcass having a main body portion extending from a tread part through sidewall parts to the bead parts and turned up portions each turned up around a bead core of the bead part from axially inside to outside. In each bead part, a first reinforcement layer of steel cords and a second reinforcement layer of steel cords are provided. The first reinforcement layer has an inside part extending along the inside surface in the axial direction of the body portion, and an outside part contiguous to the inside part and extending along the outside surface in the axial direction of the turned up portion. The second reinforcement layer extends from a radial position substantially level with the bead heel end and is interposed between the inside part and the main body portion along the main body portion so as to form an overlapping portion with the inside part.