Abstract: A tire containing a pair of beads, at least one carcass ply extending from one bead to the other bead forming a pair of sidewall areas of the tire and a tread area of the tire, and at least one layer of a knit fabric in the sidewall area of the tire, where the knit fabric has a warp and weft direction and is a double cord stitch knit fabric. A method of making the fabric and tire are also disclosed.

Abstract: A pneumatic radial aircraft tire is described having a B/A ranging between 60-70%, wherein B is the width of the tire between the wheel flange, and A is the inflated tire width under rated pressure. The tire may further optionally include a tire bead portion having a Ra/Fr1 relationship which ranges from about 1 to about 2.1, wherein: Ra is the tire heel radius at uninflated and in an new and unused condition, and Fr1 is the wheel flange elliptical radius at the heel section of the tire. The tire may further optionally include a SW/TS ratio which ranges from about 0.1 to about 0.5, wherein SW is the chafer gauge at area A, TS is the total sidewall rubber gauge at area A, wherein A is defined as the region in the sidewall that has a lower radial endpoint defined by the point of contact between the flange and the tire at inflated, unloaded condition, and an upper radial endpoint Ah defined by the tire wheel flange point of contact when the tire is at inflated, and at 100% rated load.

Abstract: A pneumatic tire that can be manufactured according to the conventional method without requiring special tire manufacturing steps and without needing addition of material members and production steps, has excellent rolling resistance and wet properties, and has conductivity.

Abstract: A reinforced rubber article comprising a rubber article and a fibrous layer embedded into the rubber article. The fibrous layer contains monoaxially drawn fibers having at least a first layer, where the first layer contains a polymer, a plurality of void-initiating particles, and a plurality of voids. Methods of forming the reinforced rubber article are also disclosed.

Abstract: A reinforced rubber article containing a rubber article and a fibrous layer embedded into the rubber article. The fibrous layer contains monoaxially drawn tape elements having a rectangular cross-section and at least a first layer having a draw ratio of at least about 5, a modulus of at least about 2 GPa, a density of at least 0.85 g/cm3. The first layer contains a polymer selected from the group consisting of polyamide, polyester, and co-polymers thereof. Methods of forming the reinforced rubber article are also disclosed.

Abstract: A reinforced rubber article comprising a rubber article and a fibrous layer embedded into the rubber article. The fibrous layer comprises monoaxially drawn fibers having at least a first layer, where the first layer contains a polymer and a plurality of voids. The voids are in an amount of between about 3 and 15 percent by volume of the first layer. Methods of forming the reinforced rubber article are also disclosed.

Abstract: A tire containing a pair of beads, at least one carcass ply extending from one bead to the other bead forming a pair of sidewall areas of the tire and a tread area of the tire, and at least one layer of a knit fabric in the sidewall area of the tire.

Abstract: The present invention aims to provide a rubber composition for a clinch or chafer which enables to improve the rim chafing resistance, elongation at break, handling stability, and fuel economy in a balanced manner, and to reduce the number of broken spews in tire demolding; and a pneumatic tire produced using the rubber composition. The rubber composition for a clinch or chafer includes 100 parts by mass of a rubber component; 1.2 to 2.9 parts by mass of zinc oxide; and 2.2 to 4.0 parts by mass of stearic acid, the rubber component including 15 to 80% by mass of a butadiene rubber and 15 to 50% by mass of an isoprene-based rubber based on 100% by mass of the rubber component.

Abstract: A technique for comprising the compression fatigue rupture strength of the carcass reinforcement external layer (3) of an aeroplane tire in the region of bending on the rim (7). The distance (d) between a point (A) on the bead external face (6) and the carcass reinforcement external layer (3), measured along the straight line perpendicular at this point to the bead external face, is at a maximum at the point (M) on the bead external face that is the orthogonal projection of the radially external end (E) of the filling element (5) onto the bead external face, and the distance (dmax) between the orthogonal projection (M) of the radially external end (E) of the filling element (5) onto the bead external face (6) and the carcass reinforcement external layer (3) is at least equal to 1.3 times the distance (d1) between the orthogonal projection (L) of the centre (O) of the bead wire core (4) onto the bead external face and the carcass reinforcement external layer.

Abstract: A heavy-load tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions each with a bead core therein, a carcass comprising a carcass ply of cords including a main portion and a pair of turnup portions, and an inner liner made from air-impermeable rubber and disposed on the tire internal cavity surface. The inner liner includes a radially inner portion that terminates radial inside than a lateral reference line passing through the innermost axial point and outermost axial point of the bead core. A rubber thickness ta is in a range of from 2.5 to 5.0 mm ranging from the tire internal cavity surface to the cord of the carcass ply on the lateral reference line, and an inner liner thickness tb is smaller than the rubber thickness ta and is in a range of from 0.5 to 3.0 mm on the lateral reference line.

Abstract: The present invention is directed to a pneumatic tire comprising at least one component, the at least one component comprising a rubber composition, the rubber composition comprising a diene based elastomer and from 1 to 30 parts by weight, per 100 parts by weight of elastomer, of a polybenzobisoxazole (PBO) short fiber having a length ranging from 0.5 to 20 mm and a thickness ranging from 10 to 30 microns, and from 1 to 30 parts by weight, per 100 parts by weight of elastomer, of an epoxidized palm oil.

Abstract: A pneumatic tire having a pair of bead portions; bead cores each having a polygonal cross section; a radial carcass having respective ends wound around the corresponding bead cores from the inner to outer side; one layer of wire chafer disposed outwardly of the radial carcass relative to the bead core; and a rubber chafer in a contact area between the bead portion and a prescribed rim, wherein, in a cross section of the tire assembled with the prescribed rim, the angle between the bottom side of the bead core and a bead seat of the prescribed rim is in the range of 0±2°, and a portion, on the tire outer surface side, of an outermost layer filament of steel cords constituting the wire chafer extends at an angle in the range of 90±5° relative to the extending direction of ply cords of the radial carcass.

Abstract: A pneumatic tire including bead apex rubbers 8 having a rubber hardness Hs1 of 80 to 95 and extending radially outward from bead cores 5, and clinch rubbers 9 having a rubber hardness Hs2 of 65 to 85 lower than the rubber hardness Hs1 and forming outer surfaces of bead portions. A carcass 6 is formed of an inner carcass ply 6A comprising a body portion 11 extending between bead cores 5, 5 and turnup portions 12 which are continuous with the body portion 11 and are turned up around the bead cores 5, and an outer carcass ply 6B comprising a body portion 13 which extends along the outer surface of the body portion 11, and the radially inner ends of which are sandwiched between the body portion 11 and the bead apex rubbers 8 to terminate there. The turnup height Lc of the turnup portion 12 from the bead base line BL is 60% or less of the tire section height L, and the height Ld of inner ends of the body portion 13 is 60% or less of the height L1 of the bead apex rubber 8.

Abstract: In a tire for vehicle wheels, each of the two annular anchoring structures includes at least two annular reinforcing inserts, each of them being made up of at least one first elongated element and at least two reinforcing elements that are mutually spaced apart and each of which extends in a radial direction and includes at least one second elongated element. An end portion of at least one carcass ply lies between two adjacent annular reinforcing inserts. The second elongated element of at least one of the reinforcing elements is of metal material and delimits an angle included between about 20° and about 70° relative to a radial direction passing through a radially internal point thereof.

Abstract: A pneumatic radial tire has a carcass ply which extends between bead cores arranged in a pair of bead portions. The carcass ply is wound up to an outer side in a tire radial direction around the bead cores. A chafer is arranged in such a manner as to wrap around the carcass ply from an inner side to an outer side in a tire width direction, around the bead core. An inner end of the chafer positioned in the inner side in the tire width direction is arranged in the outer side in the tire radial direction than a winding end of the carcass ply. A reinforcing rubber tapering off toward the outer side in the tire radial direction is provided adjacently to the outer side in the tire radial direction of the inner end of the chafer.

Abstract: A process and apparatus for manufacturing tires for vehicle wheels, includes building, on a toroidal support, a carcass structure including at least one carcass ply associated, at axially opposite end edges thereof, with annular anchoring structures, the building step of the carcass structure includes forming at least one reinforcing structure, operatively associated with the annular anchoring structures through deposition on the toroidal support of at least one reinforcing element along a predetermined curvilinear deposition path. The deposition of the at least one reinforcing element includes the steps of: cutting to size a piece of at least one reinforcing continuous band-like element fed by a feeding device along a predetermined feeding direction, deforming the piece obtained according to the curvature of a deposition part of the deposition path intended to receive the piece, and depositing the deformed piece at the deposition part.

Abstract: Provided is a pneumatic radial tire having improved pinch cut resistance without increasing the weight of the tire. The radial tire has a rubber chafer 7 arranged on the carcass ply in an contacting area of a bead portion with an applicable rim; a bead filler 8 arranged radially outside on the bead core; and a side rubber 13 extending along an outer surface of the carcass in each a side wall portion. In a state where the tire is mounted on an applicable rim R and inflated with a predetermined pneumatic pressure, an outer end 6a of the folded portion 6 of the carcass and an outer end 8a of the bead filler 8 are placed inward from an outer end r of a rim flange Rf of the applicable rim R in the radial direction; an outer end 7a of the rubber chafer 7 is placed outward from the outer end r of the rim flange Rf in the radial direction; and at least a part of a side rubber 13 located outward from the outer end of the rim flange Rf in the radial direction is disposed between the rubber chafer 7.

Abstract: A pneumatic tire is described having a chafer which is formed of at least two zones. Each zone is formed of a different material, wherein the first zone extends from axially inward of the bead to a location axially outward and radially outward of the bead. A second zone extends from the end of the first zone to the tip of the chafer. The zones are preferably formed by extrusion to form one cohesive chafer. The first zone is formed of a material having a G?/G? ratio in the range of about 0.2 to about 0.245. The second zone is formed of a material having a G?/G? ratio in the range of about 0.155 to about 0.183.

Abstract: In a pneumatic tire for heavy load in which a rubber chafer 8 is disposed at least in a part brought into contact with a rim in a bead part 1, the rubber chafer uses a rubber composition which comprises 45 to 55 parts by mass of butadiene base rubbers containing 10 to 30 parts by mass of a syndiotactic 1,2-structure-containing polybutadiene rubber and 45 to 55 parts by mass of a natural rubber as a rubber component and more than 50 parts by mass and less than 60 parts by mass of carbon black having DBP of 85 to 115 ml/100 g and a specific surface area by nitrogen adsorption (N2SA) of 50 to 100 m2/g based on 100 parts by mass of the rubber component.

Abstract: A heavy-load tire has a wind bead structure in which a turned-up portion of a carcass ply is wound around a bead core, in which a bead portion is equipped with a bead reinforcing layer having a u-shaped cross section and a bead apex rubber having a triangular-shaped cross section. The turned-up portion has an auxiliary turned-up portion passing through the vicinity of a radially outer side of the bead core. The bead apex rubber includes a high complex elasticity modulus inner apex portion disposed at a radially inner side and a low complex elasticity modulus outer apex portion disposed at a radially outer side.

Abstract: A tire includes at least one outer structural element, wherein the at least one outer structural element is at least partially coated by at least one colored coating layer including a colored composition including (a) 5% by weight to 50% by weight with respect to the total weight of the dry colored composition, of at least one crosslinked polymeric compound obtained by reacting (a1) at least one thermoplastic polyurethane with (a2) at least one polyisocyanate; (b) 10% by weight to 80% by weight with respect to the total weight of the dry colored composition, of at least one thermoplastic polymeric compound having a glass transition temperature higher than or equal to 20° C., and (c) 3% by weight to 50% by weight, with respect to the total weight of the dry colored composition, of at least one coloring agent. Preferably, the at least one structural element is at least one of the tire sidewalls.

Abstract: A heavy-duty pneumatic tire includes a carcass ply turned up around a bead core in each bead portion from the inside to the outside of the tire so as to have a pair of turnup portions and a main portion therebetween; and a bead apex and an L-shaped reinforcing cord layer. The bead apex includes: an L-shaped high-modulus inner bead apex including a base part and a radial part; and a delta-shaped low-modulus outer bead apex disposed on the radially outside of the base part of the L-shaped inner bead apex and on the axially outside of the radial part of the L-shaped inner bead apex. The L-shaped reinforcing cord layer is made up of an radially inner part extending on the radially inner side of the bead core, and an radially outer part extending along the axially outer surface of the carcass ply turnup portion.

Abstract: The present invention is directed to a pneumatic tire comprising at least one component selected from the group consisting of apexes, flippers and chippers, the at least one component comprising a rubber composition, the rubber composition comprising a diene based elastomer and from 1 to 30 parts by weight, per 100 parts by weight of elastomer (phr), of a polybenzobisoxazole (PBO) short fiber having a length ranging from 0.5 to 20 mm having a thickness ranging from 10 to 30 microns, and from 1 to 50 phr of an epoxidized polyisoprene having a number-average molecular weight of 5000 to 100000.

Abstract: The present invention provides a rubber composition for a clinch, a chafer or a sidewall, which improves fuel economy, elongation at break, and abrasion resistance in good balance while maintaining good handling stability (hardness) and processability (extrusion processability) even if the amount of zinc oxide is decreased; and a pneumatic tire having a clinch, a chafer and/or a sidewall produced therefrom. The invention relates to a rubber composition for a clinch, a chafer or a sidewall, comprising: a rubber component; a compound represented by formula (I): wherein R1 to R4 each independently represent a C1-18 linear or branched alkyl group or a C5-12 cycloalkyl group; and zinc oxide, wherein the amount of the compound represented by formula (I) is 0.2 to 6 parts by mass and the amount of the zinc oxide is 1.0 part by mass or less, for each 100 parts by mass of the rubber component.

Abstract: The invention provides a topping rubber composition for canvas chafer which provides good rim chafing resistance, durability and sheeting processability, and less heat build-up, and a pneumatic tire using the composition. The composition contains a rubber component including at least one selected from: (a) BR containing 2.5-20% by mass of 1,2-syndiotactic polybutadiene crystals, (b) BR having a cis content of 90% by mass or more, and (c) tin-modified BR that is obtained by polymerization with a lithium initiator, and has a tin-atom content of 50-3000 ppm, a vinyl-bond content of 5-50% by mass, and a molecular weight distribution of 2 or less; and carbon black having N2SA of 65-130 m2/g, wherein the total amount of the (a)-(c) is 40-90% by mass per 100% by mass of the rubber component, and the amount of the carbon black is 50-75 parts by mass per 100 parts by mass of the rubber component.

Abstract: A tire comprising at least one reinforcement structure of the carcass type anchored on either side of the tire in a bead, the base of which bead is intended to be mounted on a rim seat, the reinforcement structure extending circumferentially from the bead towards the sidewall, at least one arrangement of main cords along a substantially circumferential path being arranged substantially adjacent to the structure, the arrangement of the cords of the at least one arrangement being such that the number of main cords arranged on the axially inner side relative to the structure is greater than the number of main cords arranged on the axially outer side relative to the structure.

Abstract: Tire having a crown, a crown reinforcement, sidewalls and beads, a carcass reinforcement passing into the sidewalls and anchored in the beads. The anchoring is accomplished, in at least one bead, by a circumferential alignment of an anchoring reinforcing member oriented circumferentially and cooperating with a rubber composition. The anchoring reinforcing member is a metal cable having a construction M+N with an inner layer C1 of M wires of diameter d1 wound together in a helix at a pitch p1 , this layer C1 being surrounded by an outer layer C2 of N wires of diameter d2 wound together in a helix at a pitch p2. This anchoring cable satisfies (d1, d2, p1 and p2 being expressed in mm): 2?M?4, M+3?N ?M+7, 0.25 <d1 <0.40, 0.25 <d2 <0.40, 3.5 <p1 <7<p2<14.

Abstract: A pneumatic radial tire has a nominal section width of 255 mm or more, and an outer diameter of 720 mm or more. At least one carcass layer is constructed between paired right and left bead cores with the two end portions of the carcass layer being folded back from the inside to the outside of the tire around the respective bead cores in a way that their corresponding bead fillers are enclosed in the two folded end portions thereof. The length of each bead filler in the radial direction of the tire is 5% to 20% of the section height of the tire. The carcass layer is formed of organic fiber cords each made of at least one type of organic fiber which has an expansion ratio of 1% to 5% when a load of 2.0 cN/dtex is applied to the organic fiber. A sheet-shaped rubber reinforcement layer with a thickness of 0.5 mm to 2 mm, whose rubber has a larger rigidity than that of the sidewall section, is interposed between the carcass layer and a sidewall section on each side of the tire.

Abstract: There is provide a pneumatic radial tire for heavy loads capable of more effectively preventing a breakdown due to separation of a rubber chafer in an area corresponding to a bead heal portion than before. A pneumatic radial tire 10 for heavy loads has a pair of bead portions 12, a bead core 14 which is embedded in each of the bead portions 12, a radial carcass 16 extending from one bead portion 12 to the other bead portion 12 and turned around the bead core 14 from an inner side to an outer side of the bead portion 12 in a width direction of the tire to be anchored, a rubber chafer 22 disposed over the radial carcass 16 in the opposite side of the bead core 14.

Abstract: Provided is a pneumatic tire: which has an inner liner layer formed of a thermoplastic resin or a thermoplastic elastomer composition containing a blend of a thermoplastic resin with an elastomer; and which, despite of this, is free from air inclusion in bead parts and is capable of preventing curing failure attributable to the air inclusion. The pneumatic tire of the present invention includes: a carcass layer laid between a pair of bead parts; an inner liner layer disposed at a tire cavity side of the carcass layer; a tie rubber layer interposed between the carcass layer and the inner liner layer; and chafers for protecting the respective bead parts, an end portion on a tire cavity side of each chafer being inserted between the carcass layer and the inner liner layer.

Abstract: A heavy-load tire has a wind bead structure in which a turned-up portion of a carcass ply is wound around a bead core, in which a bead portion is equipped with a bead reinforcing layer having a U-shaped cross section and a bead apex rubber having a triangular-shaped cross section. The turned-up portion has an auxiliary turned-up portion passing through the vicinity of a radially outer side of the bead core. The bead apex rubber includes a high complex elasticity modulus inner apex portion disposed at a radially inner side and a low complex elasticity modulus outer apex portion disposed at a radially outer side.

Abstract: The present invention provides a tire having improved durability of a bead portion.

Abstract: A pneumatic tire includes an axis of rotation, a carcass, a tread, and a belt structure. The carcass has at least one reinforced ply and a reinforcing structure providing a buffer for absorbing shear strain. The tread is disposed radially outward of the carcass. The belt structure is disposed radially between the carcass and the tread. The reinforcing structure comprises at least one layer of an open construction LENO weave fabric having warp yarns extending in the radial direction and weft yarns extending in the circumferential direction.

Abstract: A tire having a circumferential tread, at least one belt, an inner liner, a pair of sidewalls, at least one carcass ply, and a pair of bead portions. The pair of bead portions each further includes a bead core, a bead filler having an upper end, a chaffer, and a gum strip. The chaffer extends axially outward from the inner liner towards the sidewall and curves radially upward along an axially outer portion of the bead core. The sidewall gum strip extends radially upward from a curved portion of the chaffer, wherein the sidewall gumstrip is located axially between the at least one carcass ply turn-up end and a sidewall.

Abstract: A thermoplastic elastomer composition having excellent durability and flexibility while possessing superior air impermeability. In particular, a process for producing a thermoplastic elastomer composition having high rubber content by multistage addition of at least one vulcanizable rubber component, in which the time required to substantially cure the at least one rubber component preferably is less the mixer residence time. Such compositions are particularly useful in applications such as tire innerliners and barrier films or layers.

Abstract: This invention provides a pneumatic tire having a highly improved steering stability, wherein a reinforcing layer formed by spirally winding a strip-shaped triaxial fabric or triaxial fabric-rubber composite having a width W satisfying a relation of the following formula (I): W?2/3×31/2×(2b/a+d)??(I) [wherein d=4×(D/(??))1/2×10?2, D is a thickness (total dtex) of cord constituting the triaxial fabric, ? is a density (g/cm3) of the cord constituting the triaxial fabric, and a is weaving density (cords/b mm) in one axis constituting the three axes] in a circumferential direction of the tire is disposed in one or more of a bead portion 1, a sidewall portion 2 and a belt portion 5.

Abstract: This invention relates to a tire having an improved durability in the run-flat running without damaging the ride comfort in the usual running, and more particularly to a run-flat tire comprising a sidewall portion provided with a side reinforcing rubber layer having a crescent shape at section wherein a cord layer including a polyketone fiber cord satisfying the following conditions of the following equations (I) and (II): ???0.01×E+1.2??(I) ??0.02??(II) [wherein ? is a thermal shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49 N (cN/dtex)] is disposed in at least a part of a region A ranging from a belt end to a maximum width part of a tire side portion and a region B ranging from a neighborhood of a bead core to a bead filler.

Abstract: Tire having two beads, at least one bead 1 of which has a seat 11 inclined toward the outside, this seat 11 being extended axially and radially to the outside by a lateral part 12. This bead 1 includes an anchoring device formed from at least one circumferential bead reinforcing element 5 and from a wedge-shaped profiled element 7 made of a rubber compound. A radial carcass reinforcement 4 is anchored in each bead to the circumferential bead reinforcing element 5, this tire being characterized in that the outwardly inclined bead seat 11 includes at least one circumferentially continuous rib 9 making at least one complete revolution, said at least one rib 9 being located axially to the outside of a plane perpendicular to the axis of rotation of the tire and axially tangential to the outside of the circumferential bead reinforcing element 5 in order to create a continuous line of contact pressure equal to or greater than the inflation pressure of the tire.

Abstract: A tire comprising sidewalls joining a crown part to beads that are intended to come into contact with a mounting rim, these sidewalls comprising a carcass reinforcement anchored in each bead to at least one bead wire and having an end in each bead, the bead wire having, seen in meridian cross-section, an outer profile comprising two profile parts, a first part radially to the inside of axial width L, extending between an axially innermost point and an axially outermost part, and a second part radially to the outside between said points. Each bead comprises at least one additional coupling reinforcement in contact with the carcass reinforcement.

Abstract: The present invention provides a rubber composition for a tire that is capable of improving air permeability resistance while preventing chipping of the bead toe and a pneumatic tire comprising the rubber composition. Specifically, the present invention relates to a rubber composition for a tire containing a composite material comprising rubber, polyolefin and nylon; the composite material being contained so that the content of nylon is 1 to 40 parts by weight based on 100 parts by weight of the total rubber component in the rubber composition.

Abstract: This invention relates to a pneumatic tire provided at its bead portion with a rubber chafer (4) and covered at its inner surface with an innerliner (5), wherein a toe rubber (6) is further arranged on a toe end part of the bead portion so as to overlap with the rubber chafer (4) and the innerliner (5) and locate at least outside the innerliner (5) at the overlapped portion with the innerliner (5), and a rubber composition A containing at least one of butyl rubber and halogenated butyl rubber as 20-40 mass % of a rubber component is used in the toe rubber (6).

Abstract: The present invention relates to a pneumatic tire having a pair of spaced apart bead components, a connecting carcass between said bead components, and a rubber chafer positioned around at least a portion of each of said bead components and intended for contacting a rigid rim of a wheel, wherein said chafer comprises an outer skin layer intended for contacting the rigid rim and an inner core layer disposed radially inward of the skin layer.

Abstract: The present invention is directed to a pneumatic tire comprising at least one component, the at least one component comprising a rubber composition, the rubber composition comprising: from 60 to 90 parts by weight of a diene based elastomer selected from the group consisting of natural rubber, synthetic polyisoprene, polybutadiene, and styrene-butadiene rubber, from 10 to 40 parts by weight of a functionalized elastomer derived from styrene, 1,3-butadiene, and a monomer of formula II where n is an integer of from 4 to 10; and from 1 to 100 parts by weight, per 100 parts by weight of elastomer (phr), of a polyketone short fiber having a length ranging from 0.5 to 20 mm and a weight ranging from 0.5 to 5 decitex.

Abstract: A pneumatic radial tire has a carcass and a tread. The carcass has at least one carcass reinforcing ply and opposing bead portions. Each bead portion has a bead core and a bead apex radially. The apexes in each bead portion having the same radial height (HA), as measured from a bead base line (B). The tire has a bead reinforcing ply comprising aramid fiber reinforcing cords located in only one bead portion of the tire, with the bead reinforcing ply being adjacent to the carcass reinforcing ply.

Abstract: A tire 2 comprises a tread 4, a pair of sidewalls 6 extended almost inward in a radial direction from an end 18 of the tread 4, a pair of bead cores 8 positioned on an inside in the radial direction of the sidewalls 6, and a carcass 10 laid between both of the bead cores 8 along insides of the tread 4 and the sidewalls 6. The carcass 10 includes a carcass ply 20. The carcass ply 20 is turned up around the bead core 8. The sidewall 6 has a lower layer 34 positioned on an outside in an axial direction of the carcass ply 20 and an upper layer 36 positioned on an outside in the radial direction of the lower layer 34. The upper layer 36 has a hardness which is equal to or higher than 50 and is equal to or lower than 70. The lower layer 34 has a hardness which is equal to or higher than 70 and is equal to or lower than 100.

Abstract: A pneumatic tire includes: a pair of bead portions 11; bead cores 12 each having a polygonal configuration in cross section; a radial carcass 13 having respective ends thereof wound around the corresponding bead cores from the inner side to the outer side of the tire; one layer of wire chafer 14 disposed on the outer side of the radial carcass 13 with respect to the bead core 12; and a rubber chafer 16 disposed in a contact area between the bead portion 11 and a prescribed rim R, wherein, in a cross section of the tire assembled with the prescribed rim R, the angle formed by the bottom side 12a of the bead core with respect to a bead seat Ra of the prescribed rim R is set in the range of 0±2°, and a portion, on the tire outer surface side, of a spiral filament or an outermost layer filament of steel cords 15 constituting the wire chafer 14 extends at an angle in the range of 90±5° with respect to the extending direction of ply cords constituting the radial carcass 13.

Abstract: A pneumatic tire comprises a carcass reaching a bead core of a bead portion from a tread portion via a side wall portion; a side wall rubber arranged in an outer side of said carcass and forming an outer side surface of said side wall portion; and a clinch rubber for preventing a rim displacement connected to a lower end of the side wall rubber and forming an outer side surface of said bead portion. The sidewall rubber and the clinch rubber are constituted by a strip wind body formed by winding and overlapping a side wall rubber strip and a clinch rubber strip in a circumferential direction and spirally, and the respective rubber strips are wound in the same direction from the bead portion side toward the tread portion side.

Abstract: A pneumatic tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions with a bead core therein, and a carcass ply extending between the bead portions through the tread portion and sidewall portions and wound around the bead core in each of the bead portions from the axially inside to the axially outside of the tire so as to form a pair of wound portions and a main portion therebetween. The bead core has a cross sectional shape elongated in a direction substantially parallel to the bottom of the bead portion so that the width thereof measured in this direction is in a range of from 1.5-2.5 times the height thereof measured perpendicularly thereto. The bead core is covered with a high modulus rubber layer having a complex elastic modulus E*1 of from 20-100 Mpa and a thickness of t1 of from 0.5-3.0 mm.

Abstract: A heavy duty tire having an improved durability in bead portions and comprising a carcass ply of steel cords, the end portions of which are turned up around bead cores from the axially inside to the axially outside of the tire, and a core protecting rubber having a complex elastic modulus of 50 to 80 Mpa, at least a part of which is located in a core inside region which is located axially inward of the bead core and is sandwiched between the axially inner surface of the bead core and the steel cords of the turnup portion of the carcass ply.

Abstract: This invention relates to rubber compositions which contain a combination of silica reinforcement and plant-derived liquid partially decarboxylated rosin acid and to tires having components thereof, such as, for example, tire treads. Said liquid partially decarboxylated rosin acid acts both as a processing aid for the mixing of the rubber composition and as an aid to reinforcement of the rubber composition by interaction with the silica in situ within the rubber composition.