Abstract: A high-transverse-curvature tire (1), in particular for mounting onto the rear wheel of motor-vehicles, comprises a tread band (8), coaxially extended around a belt structure (6), wherein a plurality of rubber blocks (10), defined between a plurality of grooves (1 1) extending along a direction substantially transverse to the tire running direction (D), are formed which grooves comprise a bottom (12) connected to opposite inlet (13) and outlet (14) sidewalls. In an equatorial zone (E) of the tread band (8), the inlet wall (13) of the grooves (11) is inclined with respect to the bottom (12) of the same towards the tire rolling direction, and forms an angle (&agr;) of from 50° to 80° with respect to a plane (&pgr;) tangent to the bottom (12).

Abstract: A tire of which tread rubber comprises a conducive rubber at least partially, the conducive rubber extending from the radially inner surface of the tread rubber to the ground contacting face, and the conducive rubber compounded from 100 parts by weight of diene rubber and 2 to 30 parts by weight of conductive short fibers, the conductive short fibers formed by coating reinforcing short fibers with a conductive substance, and the conductive rubber has a volume resistance of less than 1×108 ohm cm.

Abstract: A pneumatic tire is disclosed, which comprises: (1) a reinforcing rubber layer made of short fiber reinforced rubber, alternatively (2) a reinforcing rubber layer having hardness set in a range of 90° to 99° of JIS-A hardness, which is arranged in an area of a bead section from a bead toe section along a tire inner wall surface, and wherein a chafer composed of a non-metallic fiber cord having a high strength and a high elastic modulus is provided to cover an outer side of the reinforcing rubber layer from the tire inner wall surface to the bead toe area.

Abstract: In a tire for motor-vehicles, an auxiliary support element (9) is interposed between a carcass ply (3) and a belt structure (6). The support element is employed during the manufacturing step of the belt structure (6) in order to stably retain, on the sectors of a comb drum (10), coils (7a) consecutively formed by winding of an inextensible cord (7) therearound. The auxiliary support element (9) is made in the form of an elastomeric sheet containing short aramid fibers in an amount included between 1 and 10 parts by weight per 100 parts of elastomeric material, to increase the stretchability of said element without impairing its adhesiveness. The introduction of the short aramid fibers in the blend enables the thickness of the auxiliary support element (9) to be reduced to about 0.075 mm.

Abstract: A pneumatic tire comprising a rubber member containing a short fiber (A′) formed by the fibrillation of a short fiber (A) whose cross section takes a sea-island structure essentially composed of at least two polymers.

Abstract: A tire for two-wheeled vehicles is described, said tire having a transverse curvature coefficient with a value of not less than 0.15, comprising a torus-shaped carcass having structural means which allow improvements in the handling of the vehicle, while leaving unchanged the other performance characteristics, in particular the comfort. These structural means consist in at least one ply of a rubberized fabric provided with textile cords having a count of between 420/2 and 840/2 dtex and a modulus of elasticity of between 100,000 MPa/cm and 200,000 MPa/cm. Preferably the carcass comprises a pair of these rubberized fabric plies reinforced with PEN cords.

Abstract: A pneumatic tire for passenger cars comprises bead cores, a carcass layer, a tread portion, and side wall portions, wherein a rubber reinforcing layer having a crescent-shaped cross-section and at least one sheet of a rubber-filament fiber composite having a thickness measured under a pressure of 20 g/cm2 of 0.05 to 2.0 mm which is formed from a rubber component and filaments having a diameter or a maximum cross-sectional dimension of 0.0001 to 0.1 mm and a length of 8 mm or more are disposed in said side wall portions. Reinforcing cords of carcass plies are made of an aliphatic polyamide fiber having a melting point of 250° C. or higher.

Abstract: A pneumatic tire comprising a rubber member containing a short fiber (A′) formed by the fibrillation of a short fiber (A) whose cross section takes a sea-island structure essentially composed of at least two polymers.

Abstract: A heavy duty pneumatic radial tire comprises a carcass ply wound around a bead core from inside toward outside to form a turnup portion, a rubber chafer arranged at an outer surface side of the turnup portion, and a reinforcing rubber arranged between a portion of the rubber chafer and the turnup portion, in which the reinforcing rubber is made of an anisotropic material having different properties at least between the circumferential direction and the radial direction of the tire, and 100% moduli M.sub.1, M.sub.2 of the reinforcing rubber in the circumferential and radial directions and 100% modulus M.sub.3 of a coating rubber for the carcass ply satisfy relationships of M.sub.1 /M.sub.2 >1.1 and M.sub.2 /M.sub.3 <1.0.

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 tire for an airplane has radial carcass reinforcement surmounted by a cn reinforcement composed of at least three plies of textile reinforcing elements, including at least one twin zig-zag ply of two zig-zag plies "guided" at an angle .alpha., abbreviated to NT.alpha..degree., and at least one other "guided" ply, wherein the crown reinforcement comprises, at least between one twin zig-zag ply and one of the other "guided" plies, a decoupling intermediate layer of thickness e forming a radial distance of at least 1.0 mm between the cords of the radially lower ply and the cords of the radially upper ply surrounding the intermediate layer, the intermediate layer being formed of textile reinforcing elements coated in a rubber compound whose secant modulus of elasticity, measured at a relative elongation of between 0.06 and 0.2, is between 5 and 9 MPa.

Abstract: A pneumatic tubeless tire comprising a carcass ply of reinforcing cords extending between two tire bead regions through sidewall regions and a tread region and an innerliner disposed radially inwardly of the carcass ply is herein described. Between the sidewall region and the tread region is a tire shoulder region. In each of these shoulder regions, there is a circumferentially extending ply support strip disposed radially between the carcass ply and the innerliner. The ply support strip comprises a rubber compound containing short discontinuous fibrillated aramid fibers in an amount of between 7 and 15 parts by weight per 100 parts by weight of rubber.

Abstract: A high-transverse-curvature tire (1), in particular to be mounted on the front wheel of a motor-vehicle, comprises a belt structure (6) including, in a radially external layer (9a), a plurality of circumferential coils (7a), axially arranged side by side, of a cord (7) wound at a substantially zero angle with respect to the equatorial plane (X--X) of the tire. The area occupied by rubber blocks (10) formed in a portion of the tread band (8) having a length equal to the pitch (p) of the tread pattern and a width equal to the axial development of the tread band (8), is between 70% and 90% of the total area of said portion.

Abstract: In a tire for motor-vehicles, an auxiliary support element (9) is interposed between a carcass ply (3) and a belt structure (6). The support element is employed during the manufacturing step of the belt structure (6) in order to stably retain, on the sectors of a comb drum (10), coils (7a) consecutively formed by winding of an inextensible cord (7) therearound. The auxiliary support element (9) is made in the form of an elastomeric sheet containing short aramid fibers in an amount included between 1 and 10 parts by weight per 100 parts of elastomeric material, to increase the stretchability of said element without impairing its adhesiveness. The introduction of the short aramid fibers in the blend enables the thickness of the auxiliary support element (9) to be reduced to about 0.075 mm.

Abstract: A fiber composite material in which short fibers, such as polyester short fibers, are added to a matrix, such as a cross-linked rubber matrix, is provided, wherein a heat shrinkage ratio of the short fibers is 8% or less at fiber composite material molding temperatures of 140 to 200.degree. C. Also provided is a pneumatic tire in whose tire tread the fiber composite material is used. Such pneumatic tires include pneumatic tires provided with a foamed rubber layer in a tire tread. The foamed rubber layer has an average cell diameter of 10 to 120 .mu.m and an expansion ratio of 3 to 50%. A solid phase rubber portion of the foamed rubber layer includes 5 to 55 parts by weight of carbon black, 55 to 5 parts by weight of silica, and 1 to 15 parts by weight of short fibers to 100 parts by weight of a diene-base rubber component including 70 to 20 parts by weight of natural rubber and 30 to 80 parts by weight of polybutadiene rubber. A surface of the tire tread has a hardness of 52 or less at 0.degree. C.

Abstract: A pair of high-transverse-curvature tires for two-wheeled vehicles is provided, in which the belt structure of the rear tire comprises a layer of inextensible cords disposed at a substantially zero angle with respect to the equatorial plane of the tire, preferably wound on a sheet of elastomeric material reinforced with aramid pulp, whereas the belt structure of the front tire comprises at least one radially outer layer of inextensible cords disposed at a substantially zero angle with respect to the equatorial plane of the tire and distributed with an axially variable density, and preferably another reinforcing layer at a radially underlying position. The zero-degree cords preferably are metallic cords of the high-elongation type, made of high-carbon steel.

Abstract: Liquid-crystal solutions comprising cellulose dissolved in a solvent agent. They contain more than 10% by weight of cellulose, and are optically anisotropic at rest and at room temperature. The solvent agent contains more than 85% by weight of at least one phosphoric acid, this phosphoric acid or all of these phosphoric acids having the following average formula :?n(P.sub.2 O.sub.5), p(H.sub.2 O)!,with 0.33<(n/p)<1.0.A method of obtaining such solutions. Production of fibers or films from these solutions. Assemblages of such fibers of films. Articles reinforced by such fibers or films or assemblages, said articles being in particular tire casings.

Abstract: A front tire for-wheeled vehicles comprising a carcass of toric form having a high transverse curvature and provided with a central crown and two sidewalls terminating in a pair of beads for anchoring to a corresponding mounting rim, a tread band located on the crown and a circumferentially-inextensible belt structure disposed between the carcass and tread band. The belt structure at a radially external position is comprised of a layer of cord coils substantially disposed at a zero angle to the equatorial plane of the tire in axial side-by-side relationship and extended from one axial extremity of the belt to the other axial extremity of the belt. The winding thickness of the cord coils increasingly grows from the equatorial plane to the belt axial extremities.

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 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: A pneumatic tire comprises a radially innermost belt ply having an axial width of from 0.8 to 1.2 times the tread width, a carcass with turnup portions having a radially outer end at a height of not more than 0.15 times the tire section height H, and a short fiber reinforcing layer having a thickness of from 0.3 to 1.0 mm disposed along the axially outer surface of the carcass in each of a pair of sidewall portions between the axial outer edge of the radially innermost belt ply and the radially outer end of the carcass turnup portion. The short fiber reinforcing layer is a compound of: 100 parts by weight of a base rubber compound containing 40 to 70 parts by weight of butadiene rubber and 60 to 30 parts by weight of natural rubber and/or isoprene rubber; 10 to 30 parts by weight of short fiber; and not more than 30 parts by weight of carbon black whose iodine number is in the range of from 30 to 90 mg/g.

Abstract: A pneumatic tire comprises a tread made from an oriented rubber so that a modulus ratio of 300% tensile modulus in a circumferential direction of the tire to 300% tensile modulus in a widthwise direction of the tire is larger by at least 0.1 times in a central region of the tread than in each side region of the tread.

Abstract: A pneumatic tire particularly adapted for cars, is provided with belt strips (7, 8) each comprising a first and a second series of cords (7a, 7b, 8a, 8b) made of different materials, alternated with each other axially across the width of the tire according to a preestablished sequence. The cords (7b, 8b) of the second series, made of aramid or glass for example, cooperate with those of the first series (7a, 8a), made of steel, to withstand tensile stresses in the longitudinal direction. Conversely, the cords (7b, 8b) of aramid or glass have a greater compliance than the steel cords (7a, 8a) towards compressive stresses. The elastomer incorporating the cords (7a, 7b, 8a, 8b) is filled with reinforcing fibers, short aramid fibers or aramid pulp for example, and has a modulus of elasticity between 15 and 50 megapascals.

Abstract: An aircraft tire 10 has at least one circumferentially extending reinforcement insert. At least one reinforcement insert 90 is located on one side of the tire. Each insert 90 preferably has two cord reinforced members 91,92 having bias angled cords. The cords are equal but opposite in orientation relative to the cords of the adjacent member. The pairs of reinforced members 91,92 extend from the bead portion 18,20 and terminate in a radially upper portion of the sidewall 14A,16A. Each pair of reinforced members 91,92 is interposed between the carcass plies 36,37,38,39,40,41, and the sidewall of the tire 10. In a preferred embodiment of the invention the inserts 90 are located on only one side of the tire. Alternatively, the inserts can be symmetrically added to each side of the tire.

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 tire having a tread composed of a matrix rubber, a low hardness rubber powder, hollow particulates, and short fibers, and optionally a liquid polymer, wherein the low hardness rubber powder has an average particle size of less than 1000 .mu.m, including or not including no more than 20 parts by weight of carbon per 100 parts by weight of the rubber component in the low hardness rubber powder, and is contained in an amount of 1 to 10 parts by weight per 100 parts by weight of the matrix rubber, the hollow particulates have an average particle size of 10 to 120 .mu.m and an average thickness of 0.1 to 15 .mu.m, and the short fibers have an aspect ratio (ratio of length/diameter) of 10 to 1000.

Abstract: Partially oriented yarns (POY), when processed into short fibers and used as a fiber reinforcement in an elastomer, have been found to demonstrate reduced crack propagation in the elastomer. POY reinforced elastomers can be used in tires to replace cord reinforced components, and for example, can be used in the tread base of a tire, obviating the need for an overlay ply. In one embodiment it has been found that the properties of a fiber reinforced elastomer can be optimized by using a mixture of partially oriented fibers and fibrillated pulp fibers, such as pulped high modulus rigid rod liquid crystalline fibers, as the fiber reinforcement.

Abstract: An aircraft tire 10 has at least one circumferentially extending reinforcement insert. At least one reinforcement insert 90 is located on one side of the tire. Each insert 90 preferably has two cord reinforced members 91,92 having bias angled cords. The cords are equal but opposite in orientation relative to the cords of the adjacent member. The pairs of reinforced members 91,92 extend from the bead portion 18,20 and terminate in a radially upper portion of the sidewall 14A,16A. Bach pair of reinforced members 91,92 is interposed between the carcass plies 36,37,38,39,40,41, and the sidewall of the tire 10. In a preferred embodiment of the invention the inserts 90 are located on only one side of the tire. Alternatively, the inserts can be symmetrically added to each side of the tire.

Abstract: Cap tread has a tan .delta. peak temperature of not less than -30.degree. C. Base tread comprises not less than 30 parts of a carbon black having an iodine adsorption number of 30 to 90 mg/g and not less than 10 parts of a short fiber oriented in the axial direction. Side wall comprises not more than 30 parts of the carbon black and not less than 10 parts by weight of the short fiber oriented in the peripheral direction. Bead apex comprises not less than 65 parts by weight of a carbon black which has an iodine adsorption number of 60 to 100 mg/g and not less than 20 parts by weight of the short fiber oriented in the axial direction or a direction which crosses the axial direction. This radial tire is light and has a low energy loss, and can provide an excellent steering stability.

Abstract: A tire, intended to be inflated but capable of running in a deflated condition, the carcass (2) of which incorporates, at each of the sidewalls (5) thereof, a first and a second reinforcing insert (16, 17) having in section a substantially lenticular form tapering to the ends, interposed between a first carcass ply (10) and a second carcass ply (11) and mutually joined at the tire maximum-chord point. Also applied to each sidewall against the carcass ply (10) turned to the inner part of the tire is an elastic support insert (13) of lenticular section having a maximum thickness portion (13a) disposed at the junction point (18) between the two reinforcing insertions (16, 17). The elastic support insert (13) comprises a substantially stiff counter core (14) of lenticular section, and a cover (15) made of elastomeric material have a low modulus of elasticity, coating the counter core (14) at one side thereof turned towards the carcass plies.

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: An aircraft tire 10 has at least two circumferentially extending reinforcement inserts. At least one pair of reinforcement inserts 90 is located on each side of the tire. Each insert 90 preferably has two cord reinforced members 91, 92 having bias angled cords. The cords are equal but opposite in orientation relative to the cords of the adjacent member. The pairs of reinforced members 91, 92 extend from the bead portions 18, 20 and terminate in a radially upper portion of the sidewalls 14A, 16A. In the preferred embodiment, each bead portion 18, 20 includes three substantially inextensible bead cores 50, 52 and 54. Each pair of members 91, 92 is interposed between a pair of carcass plies 36, 37, 38, 39, 40, 41, 42, 43 on the ply side of the tire 10. This structure can increase tire durability while at the same time achieve a significant weight reduction.

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 tire, intended to be inflated but capable of running in a deflated condition, the carcass (2) of which incorporates, at each of the sidewalls (5) thereof, a first and a second reinforcing insert (16, 17) having in cross-section a substantially lenticular form tapering to the ends, interposed between a first carcass ply (10) and a second carcass ply (11) and mutually joined at the tire maximum-chord point. Also applied to each sidewall against the carcass ply (10) turned to the inner part of the tire is an elastic support insert (13) of lenticular cross-section having a maximum thickness portion (13a) disposed at the junction point (18) between the two reinforcing insertions (16, 17). The elastic support insert (13) comprises a substantially stiff counter core (14) of lenticular cross-section, and a cover (15) made of elastomeric material have a low modulus of elasticity, coating the counter core (14) at one side thereof turned towards the carcass plies.

Abstract: A pneumatic tire having a tread rubber layer disposed radially outside a carcass, a sidewall rubber layer disposed axially outside the carcass in each sidewall portion, the sidewall rubber layer softer than the tread rubber layer, a protective rubber layer disposed on the outer surface of the sidewall rubber layer, the protective rubber layer made of a fiber-reinforced rubber composition contains 10 to 50 parts by weight of short fibrous reinforcements, 20 to 70 parts by weight of carbon black, and 100 parts by weight of rubber base consisting of 20 to 100 parts by weight of natural rubber or isoprene rubber and 80 to 0 parts by weight of butadiene rubber, the short fibrous reinforcements oriented in the tire circumferential direction.

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: An improved tire such as a radial ply tire of the type including a radial carcass body ply or plies, side walls and a tread and further including at least one cordless belt assembly positioned and aligned on the outer or inner circumference of the radial carcass body ply or plies, or positioned on both sides of the radial carcass body ply or plies, including between the radial carcass and the tread, each cordless belt assembly consisting essentially of plural parallel, discontinuous, oriented fibers embedded in an elastomeric material, the fibers being oriented parallel to each other, the tire characterized by the absence of circumferential peripheral cords or other cords for restricting the periphery of the tire carcass against outward expansion, and the absence of corded belts on the shoulder of the radial carcass body ply or plies.

Abstract: Disclosed is a high-performance tire in which a bead filler formed of a rubber composition fills up a space between each turn-up portion of the carcass and a major portion of the carcass and extends to some extent along the carcass toward the tread. The rubber composition is anisotropic such that the elastic modulus in the direction circumferential of the tire is distinctly higher than in the direction radial of the tire. Such anisotropy can be produced by incorporating short fiber of a suitable thermoplastic polymer such as nylon into the rubber composition. This tire provides both improved controllability and a good ride.