Abstract: A pneumatic tire including a carcass, a belt arranged at the outside of the carcass in a radial direction and having at least two belt layers, at least one belt reinforcing layer arranged so as to overlap with the belt and extend over a widthwise outer end thereof, and a tread rubber arranged at the outside of the belt in the radial direction. A pair of split auxiliary belt layers are arranged so as to overlap at least with both widthwise outer end portions of a widest-width belt reinforcing layer. Reinforcing elements having an inclination angle different from that of reinforcing elements in the belt reinforcing layer are embedded in the split auxiliary belt layer for decreasing the wearing rate at the tread end portion of the tire to effectively control irregular wear.

Abstract: The present invention provides an improved fiber-reinforced article comprised of at least two plies. Each of the plies comprises (a) rubber and (b) cord made from melt-spinnable, non-metallic, multifilament fibers for which the cord has a twist multiplier of less than or equal to about 375, a stress at 1% strain greater than or equal to about 1.7 grams/denier, and an initial compressive modulus greater than or equal to about 7 grams/denier, and the at least two plies have a fiber orientation angle of greater than or equal to about 23°. The composite is useful as a tire belt in a passenger tire.

Abstract: A pneumatic tire comprises a carcass, a belt comprised of at least two belt layers, a belt reinforcement arranged between the carcass and the belt and comprised of at least one belt reinforcing layer, and a tread rubber, in which a widthwise outer end of a widest-width belt reinforcing layer is arranged outward from a widthwise outer end of a widest-width belt layer among the belt layers, and a restraining rubber having a width of not less than 4 mm and a JIS hardness not less than a JIS hardness of a coating rubber for the widest-width belt reinforcing layer is arranged outward from the widthwise outer end of the widest-width belt reinforcing layer.

Abstract: The invention relates to a tire with radial carcass reinforcement, intended for equipping a heavy vehicle such as a transport vehicle or construction machinery. It refers in particular to a tire having an axial width greater than 37 inches. The tire according to the invention has a working crown reinforcement, composed of at least two continuous working plies and completed on each side of the circumferential center plane by at least two half-plies whereof the metal reinforcing elements form angles greater than the smallest of the angles of the reinforcing elements of the continuous plies with the circumferential direction, with that half-ply extending axially furthest outwards being in contact with the axially widest continuous working crown ply, and the two half-plies radially covering the axially outer end of the said axially widest working ply.

Abstract: Tire for heavy off-the-road vehicles comprising a radial carcass reinforcement (1) anchored in each bead to an annular bead reinforcement element (2), and radially above it a crown reinforcement (3) consisting of at least two working crown plies (320, 321) of inextensible metallic cables crossed from one ply (320) to the next (321), the said plies having widths at least equal to 50% of the width L of the tread (4) and, radially above these, two protection crown plies (330, 331) of so-termed elastic metallic cables crossed from one ply (330) to the next (331), the tread (4) comprising in its ungrooved portion of thickness D at least one armature (34) of reinforcement elements, wherein the said armature (34) is composed of at least two layers (340, 341) of textile monofilaments parallel to one another in each layer, the axial widths of the said two layers (340, 341) being at least equal to the width of the narrower working ply (321).

Abstract: A pneumatic radial tire comprises a radial carcass, a cross belt comprised of at least two belt layers, a belt reinforcing member arranged adjacent to the belt and comprised of at least one belt reinforcing layer containing a reinforcing element embedded therein and extending in a circumferential direction while bending in form of wave or zigzag, and a tread rubber, in which the widthwise outer end of the belt reinforcing member is located outward from the widthwise outer end of the widest-width belt layer, or a belt protection member is disposed in the neighborhood of the belt so that the widthwise outer end of the belt protection member is located outward from the widthwise outer end of the belt reinforcing member in a widthwise direction of the tire.

Abstract: In a pneumatic radial tire comprising a belt of at least two belt layers, in which the belt comprises a maximum-width belt layer containing many cords slantly arranged with respect to an equatorial plane of the tire and a narrow-width belt layer arranged at the outside of the maximum-width belt layer in the radial direction and containing many cords arranged in an oppositely inclined direction to the cords of the maximum-width belt layer, the belt end separation is controlled by arranging a reinforcing layer containing many cords arranged in an oppositely inclined direction to the cords of the maximum-width belt layer so as to overlap with an outer end portion of the maximum-width belt layer located outward from an outer end of the narrow-width belt layer in the widthwise direction thereof.

Abstract: A tire with radial carcass reinforcement, having a crown reinforcement which includes at least two working crown plies made of inextensible cables, crossed from one ply to the other, and an additional ply, axially continuous and formed of undulating metallic elements orientated essentially parallel to the circumferential direction and positioned between the working plies.

Abstract: A radial tire for motorcycles comprises a carcass extending between bead portions through a tread portion and sidewall portions, and a belt disposed radially outside the carcass in the tread portion and comprising two cross breaker plies of cords laid at angles of from 16 to 26 degrees with respect to the tire equator. And the method of making the radial tire comprises vulcanizing the tire in a mold which causes a variable stretch to the belt during vulcanizing the tire, wherein the stretch at the tire equator is in a range of from 6.0 to 7.0%, and the stretch gradually decreases from the tire equator to the axial edges of the belt. The stretch is defined as (BD2/BD1−1)×100 wherein BD1 is the inside diameter of the belt before tire vulcanization, and BD2 is the inside diameter of the belt during tire vulcanization.

Abstract: A medium truck tire (10) and more specifically a super single truck tire (10) includes belt plies (24, 25) reinforced with steel cords which make an angle comprised between 0° and 5° with respect to the equatorial plane. At least one belt ply (24, 25) is helically wound on the carcass ply (16). The steel of the reinforcing cords comprises high elongation steel. Radially outside to the at least one helically wound belt ply (24, 25), there are several spliced belt plies (22, 23), making angles comprised between 45° and 75° with respect to the equatorial plane.

Abstract: A pneumatic tire comprises the following belt (A) or belt (B). The belt (A) comprises a ply made of waved monofilament steel cords and a ply made of multi-filament steel cords, wherein the waved monofilament steel cord is (1) spirally waved so that the wave pitches PA are in a range of from 14 to 50 mm and the amplitude HA of each wave is in a range of from 0.002 to 0.02 times the pitch PA of the wave, or (2) two-dimensionally waved so that the wave pitches PB are in a range of from 5 to 50 mm, and the amplitude HB of each wave is in a range of from 0.002 to 0.05 times the pitch PB of the wave. The belt (B) comprises two plies made of waved monofilament steel cords, wherein the waved monofilament steel cord is waved so that the wave pitches P are in a range of from 0.008 to 0.08 times the circumference of the tire and the wave height of each wave is in a range of from 0.002 to 0.025 times the pitch P of the wave.

Abstract: A chip resistant pneumatic tire (10) is provided. The tire has an original reinforced rubber sheet (22, 22b) embedded in or under its tread (18) and/or sidewall (20 ), and is used in off the road applications such as mining. Low sulfur rubber (17) is used to coat the organic reinforcement (11), and its shown that such rubber (17) is more compatible with rubber used to form the tread (18) or sidewall (20), which together with the organic reinforcement (11), helps prevent chipping and chunking in the tread (18) and sidewall (20). The illustrated organic filaments of cords (11) have a round cross section and are at least 2000 denier (2200 dTex) and have a tenacity of at least 3.5 g/denier (31 cN/Tex), an initial modulus of at least 20 g/denier (177 cN/Tex), an elongation at break of at least 10%, and a shrinkage of at most 10%.

Abstract: In a heavy duty radial tire, a reinforcement belt 8 outward in a radial direction of the tire and a high-strength belt 13 inward in the radial direction are arranged between a radial carcass 2 and a tread rubber 4, and an intersect angle between cord 6a of an innermost wide-width slant cord layer 6 in the reinforcement belt 8 and cord 12a of an outermost narrow-width slant cord layer 12 in the high-strength belt 13 is not less than 10° at an acute angle side, and narrow-width slant cord layers 11, 12 of the high-strength belt 13 in the tire mounted onto a rim and inflated under a maximum air pressure have a width corresponding to 20˜60% of a ground contact width of the tread rubber 4, and inclination angles of cords 11a, 12a with respect to an equatorial plane 5 of the tire are not more than 15°, and a rubber gauge t1 of a first rubber layer 14 between cord 6a of an innermost wide-width slant cord layer 6 and cord 12a of an outermost narrow-width slant cord layer 12 is 0.9˜3.

Abstract: A tire having a crown reinforcement formed of at least two working crown plies (32, 34) having axial widths L32, L34 greater than the width L33 of an additional reinforcement (33) of inextensible, substantially radial reinforcement elements, which reinforcement is arranged radially between said plies (32, 34) and is axially composed of three parts, a central part (33′) in the form of a ply formed of inextensible, substantially radial reinforcement elements and two lateral parts in the form of strips (33″), each formed of circumferential reinforcement elements, the modulus of elasticity upon traction per unit of width of a lateral strip being at most equal to the modulus of elasticity upon traction, measured under the same conditions, of the most extensible working ply.

Abstract: A motorcycle tire including a highly convex tread joined by two sidewalls of low height to two beads, each bead being reinforced by an inextensible annular element around which is anchored a carcass reinforcement formed of textile reinforcement elements forming with the circumferential direction an angle of between 70° and 90°, the carcass reinforcement being radially surmounted by a crown reinforcement formed of at least one ply of circumferential reinforcement elements, located radially between the carcass reinforcement and the radially outermost ply of the crown reinforcement, and of two plies of elements of textile material, which are crossed from one ply to the next and forming with the circumferential direction angles of between 65° and 85°.

Abstract: An aircraft tire, having a radial carcass reinforcement surmounted radially to the outside by a crown reinforcement and a tread, said crown reinforcement including: a) at least one ply of reinforcement elements of high modulus oriented circumferentially, b) two plies having ends free of reinforcement elements of high modulus, which are parallel to each other within each ply and are crossed from one ply to the next, forming with the circumferential direction an angle &agr;, of between 5° and 35°, and c) radially to the outside, an assembly of at least two layers of textile elements of low modulus which are oriented relative to the circumferential direction at an angle &bgr;, of between 0° and 35°, said two layers being obtained by winding in a zigzag a strip, formed of at least one coated cable, and the assembly of the layers having an axial width greater than the width of the tread, whereas the widths of the textile plies of high modulus are less than said width of the tread.

Abstract: A tire for heavy equipment, having at least one radial carcass reinforcement surmounted radially to the outside by a crown reinforcement formed of at least three so-called working plies formed of inextensible metal cables, crossed from one ply to the next, forming angles of between 15° and 35° with the circumferential direction. At least one half-ply, formed of inextensible metal cables and of width L′, on either side of the equatorial plane XX′, is arranged between the edges of at least two radially adjacent working plies, the cables of said half-ply forming with the circumferential direction an angle, which is firstly greater in absolute value than 25°, and secondly is greater in absolute value than the largest angle formed by the elements of the two working plies by an amount between 5° and 15°.

Abstract: A tire includes a radial carcass reinforcement surmounted by a crown reinforcement formed of at least one working reinforcement having two plies of inextensible metallic reinforcement elements, parallel to each other within each ply and crossed from one ply to the next and forming with the circumferential direction angles &agr;1 and &agr;2 between 10° and 45,° and at least one protective ply. The axial widths L1 and L2 of the working plies and the axial width L3 of the at least one protective ply are such that L3<L2<L1. On either side of the equatorial plane XX′ of the tire is at least one additional ply of inextensible metallic reinforcement elements located in the plane of the protective ply and oriented in the same direction as the elements of the least wide working ply, which forms with the circumferential direction an angle &agr;4 greater in absolute value than the angle &agr;2 of the elements of the radially outer working ply by at least 5°.

Abstract: A heavy duty pneumatic radial tire comprises a carcass ply, a belt disposed at an outside of the carcass ply in the radial direction and comprised of two or more belt layers, at least one auxiliary belt layer disposed in a widthwise central portion of the belt at a width narrower than that of the belt, and a tread, wherein when the tire is mounted onto a design rim defined in TRA standard and inflated under an internal pressure corresponding to 10% of an air pressure defined in the TRA standard, a radius of curvature of an outer profile at both side regions of the tread (Rs) is made larger than a radius of curvature of the outer profile at a central region of the tread (Rc).

Abstract: A pneumatic tire comprises a carcass comprised of one or more carcass plies and a belt disposed on an outer periphery side of a crown portion of the carcass and comprised of one or more belt layers, wherein each of at least one carcass ply and at least one belt layer is constituted with organic fiber cords having a modulus of elasticity within a specified range.

Abstract: A pneumatic radial ply tire (50) having a tread (52), a carcass (60) with two sidewalls (77, 78), two or more radial plies (70, 72), two annular beads (36a′, 36b′), a belt structure (56) located radially between the tread and the radial ply structure (58), one or more circumferentially deployed high-modulus incompressible belt reinforcements (66) and/or two or more circumferentially deployed high-modulus tensile-stress-bearing fabric reinforcements (59). Belt reinforcement(s) (66) and/or fabric reinforcement(s) (59) work to increase the lateral and circumferential rigidity of the tread (52) and underlying structures of the carcass (60). The lateral and circumferential stiffening of the tread (52) enhances high-speed runflat handling and contributes to improved runflat operational life.

Abstract: A pneumatic tire with a folded belt structure comprises a cut belt and an overlay encompassed by folded over edges of the folded belt. Low aspect ratio tires for high performance automobiles having this structure can be made using a variety of materials.

Abstract: A tire having a form ratio under 0.80, a metallic radial carcass reinforcement, and a working crown reinforcement of two working plies formed of non-extensible reinforcement elements oriented at angles &agr; and &agr;′, with axial widths in the ranges between 0.65So to 0.80So and 0.35So to 0.45So, So being the maximum axial width of the median line of the carcass reinforcement, and two half-plies of non-extensible metallic elements making an angle &bgr; with the circumferential direction, where &bgr; is less than angles &agr;, &agr;′ by at least 2°, and is opposite to angle &agr; of the widest axially continuous working ply, the half-plies located on either side of the equatorial plane XX′ having axial widths between 0.22So and 0.35So, and axially inside edges separated from the equatorial plane XX′ by a distance equal to half the width of the narrower working ply less an amount of at least 0.05So.

Abstract: A tire having a radial carcass reinforcement, a crown reinforcement including at least two working crown plies of inextensible reinforcement elements, crossed from one ply to the other ply, forming angles of between 10° and 45° with the circumferential direction, and an additional, axially continuous, ply formed of continuous, inextensible and substantially radial metallic reinforcement elements made of steel, the additional ply being placed radially between the working plies, and having an axial width which is at least 1.1 times the axial width of the widest working crown ply.

Abstract: A heavy duty pneumatic radial tire comprises a radial carcass, a belt and a tread, wherein the belt is comprised of four or more belt layers, cords of adjacent two belt layers among these layers are crossed with each other with respect to an equatorial plane of the tire. In this tire, when a main cross belt is constituted with a widest-width belt layer and a wider-width belt layer in two belt layers adjacent to the widest-width belt layer, an inclination angle of cords in a neighboring narrower-width belt layer arranged at an outside of the main cross belt in the radial direction and adjacent thereto with respect to an equatorial plane of the tire is made larger than an inclination angle of cords in a belt layer arranged outward in the radial direction among the widest-width and wider-width belt layers.

Abstract: A self-supporting tire for vehicle wheels includes a carcass structure having at least one carcass ply, a belt structure, a tread band, at least one pair of sidewalls, and at least one pair of resilient stiffening inserts incorporated into the carcass structure. The at least one carcass ply includes axially-inner strip lengths and axially-outer strip lengths, and may also include axially-intermediate strip lengths. Each of the strip lengths extend in a U-shaped configuration around a cross-section outline of the carcass structure to define two side portions spaced apart from each other in an axial direction and a crown portion extending at a radially-outer position between the side portions. The resilient stiffening inserts are axially interposed between the side portions of the axially-inner strip lengths and the side portions of the axially-outer strip lengths.

Abstract: A tire with a radial carcass reinforcement of maximum axial width S0, including a crown reinforcement formed of at least two working crown plies of inextensible reinforcement elements, crossed from one ply to the other, forming angles of between 10° and 45° with the circumferential direction, the plies having axial widths greater than the width of an additional ply of inextensible, substantially radial, metallic reinforcement elements. The additional ply is arranged radially between the working plies, the working plies being, on either side of the equatorial plane and in the immediate axial extension of the additional ply, coupled over an axial distance at least equal to 3.5% of the width S0, then being decoupled by profiled members of rubber mix at least over the remainder of the width common to the two working plies.

Abstract: A tire having a crown, two sidewalls and two beads, a carcass reinforcement anchored in the two beads and a crown reinforcement, the crown reinforcement including radially, from inside outward, a working block with at least one ply of parallel cords of circular orientation and a protective block with at least one ply of parallel cords of elongation at rupture greater than that of the cords of the ply of circumferential orientation of the working block, characterized in that said ply of parallel cords of circumferential orientation is the radially outermost ply of said working block and in that the parallel cords of said ply of said protective block have a circumferential orientation.

Abstract: The invention improves rubber permeability while making a cord diameter compact. A metal cord is constituted by a layered structure having a core comprising totally 6 to 12 filaments sectioned into 1 to 4 filament bundles, and a sheath comprising 8 to 15 filaments arranged around the core. Each of the filament bundles includes a waved filament modeled in a two-dimensional wave shape and a non-waved filament, in a state before being bundled. The core makes the wave of the waved filament three-dimensional within the core by applying torsion to each of the filament bundles.

Abstract: A motorcycle tire including a highly convex tread joined by two sidewalls of low height to two beads, each bead being reinforced by an inextensible annular element around which is anchored a carcass reinforcement formed of textile reinforcement elements forming with the circumferential direction an angle of between 70° and 90°, the carcass reinforcement being radially surmounted by a crown reinforcement formed of at least one ply of circumferential reinforcement elements, located radially between the carcass reinforcement and the radially outermost ply of the crown reinforcement, and of two plies of elements of textile material, which are crossed from one ply to the next and forming with the circumferential direction angles of between 65° and 85°.

Abstract: A pneumatic tire which comprises: a carcass extending between bead portions through a tread portion and sidewall portions; a breaker disposed radially outside a crown portion of the carcass; a pair of axially spaced high modulus edge bands disposed radially outward of edge portions of the breaker and each made of one or more high modulus cords having a sectional area SH and a 2% modulus MH and wound substantially parallel to the tire circumferential direction at a cord count DH; a low modulus middle band disposed radial outward of the breaker between the high modulus edge bands and made of one or more low modulus cords having a sectional area SL and a 2% modulus ML less than the 2% modulus MH and wound substantially parallel to the tire circumferential direction at a cord count DL; and an elongation resistance index PH of each of the high modulus edge bands, which is defined as the product of the 2% modulus MH in N/sq.mm, the sectional area SH in sq.

Abstract: A tire with radial carcass reinforcement having a maximum axial width S0 and including a crown reinforcement composed of at least two working crown plies of inextensible reinforcing elements, crossing from one ply to the next at angles of between 10° and 45° to the circumferential direction, the said plies having axial widths equal to at least 80% of the width S0, and arranged radially between the said working plies, an additional ply of reinforcing elements essentially parallel to the circumferential direction, the working plies having widths greater than the width of the additional ply by at least 16% of the width S0, and being on both sides of the equatorial plane and in the immediate axial extension of the additional ply coupled over an axial distance equal to at least 3% of the width S0, thereafter being separated by a section of rubber mix having a thickness of at least 2 mm.

Abstract: In a pneumatic tire for an airplane of the present invention, a reinforcing layer, which is disposed at an outer side, in the radial direction of the tire, of a belt, includes plural cords, the cords being provided such that the longitudinal direction thereof forms an angle of substantially 15° or less with respect to a tire circumferential direction. The reinforcing layer has two or more joint portions in the circumferential direction of the tire. In accordance with the present invention, a length of the cords forming the reinforcing layer in the tire circumferential direction can be made short, whereby a size (length) of tread pieces formed at a time when the tire is damaged can be made small and damage caused to an airplane can be reduced.

Abstract: A pneumatic tire which comprises a tread portion provided on each side of the tire equator with axial grooves extending axially inwardly from the tread edges, the axial grooves inclined to one direction with respect to the tire axial direction to form a non-directional tread pattern, and the inclination angle of the axial grooves to the tire circumferential direction is decreased from the axially outer end to the axially inner end thereof so as to have a minimum inclination angle &bgr;min of less than 45 degrees, and a maximum inclination angle of from 60 to 85 degrees. Preferably, the radially outermost belt ply has a cord angle a of 10 to 35 degrees to the tire equator and the axial grooves inclined in the reverse direction to the belt cords, and |&bgr;min−&agr;|≦25 degrees.

Abstract: A pneumatic tire comprises a carcass, a belt comprised of at least two belt layers, a belt reinforcement arranged between the carcass and the belt and comprised of at least one belt reinforcing layer, and a tread rubber, in which a widthwise outer end of a widest-width belt reinforcing layer is arranged outward from a widthwise outer end of a widest-width belt layer among the belt layers, and a restraining rubber having a width of not less than 4 mm and a JIS hardness not less than a JIS hardness of a coating rubber for the widest-width belt reinforcing layer is arranged outward from the widthwise outer end of the widest-width belt reinforcing layer.

Abstract: A radial "heavy vehicle" tire, of H/S form ratio of at most 0.60, with a wn reinforcement (2) composed of at least two crossed working plies (21, 22), and at least one ply (20) of circumferential cables arranged above the carcass ply (1) and a tread (10) of width L, characterized in that there is arranged, between the ply of circumferential cables (20) and the first, radially innermost, working ply (21), a layer of rubber mix (4) of low modulus of extension, of constant thickness of between 2 and 3 mm.

Abstract: A radial pneumatic tire having excellent run-flat durability. The tire is equipped with a belt (4), which includes a plurality of metal cord layers, and a tread (5) successively placed at a periphery of a crown portion (3) of a toroidal radial carcass (2), and is equipped with, at an inner peripheral surface of the side portion (6) of the carcass, a rubber reinforcing layer (7) having a crescent moon shaped cross-section and bearing and supporting load. The tire has an auxiliary belt (8) disposed between the carcass and the belt and including organic fiber cords which are oriented substantially cross to the cords of the carcass and the cords of the belt with respect to a central equatorial plane, the cords of the auxiliary belt substantially crossing the central equatorial plane.

Abstract: A pneumatic vehicle tire comprises a single ply or multi-ply radial carcass anchored to beads, a tread, and a breaker arrangement provided between the carcass and the tread. The breaker arrangement is preferably built up of at least two cut breaker plies with the threads or cords of the cut breaker plies, which serve as strength carriers and extend parallel to one another in the respective ply, crossing at a predetermined angle to the central mid-circumferential plane. The tire also comprises at least one cover ply of cords or threads extending substantially in the circumferential direction of the tire, at least one cover ply surrounding the breaker arrangement at least in the breaker arrangement's edge regions. In the preferred embodiment the breaker arrangement (4) has threads or cords (9) of non-metallic material and a material with a low thermal shrinkage or no thermal shrinkage is used as the material for the treads or cords (8) of the at least one cover ply (5).

Abstract: In the crown reinforcement (2) of a "heavy vehicle" tire, known as a high tire, the wires or cables of the triangulation ply (20) and the second working ply (22) are the widest of the reinforcement (2) and the radial distances between the respective wires or cables of the two plies at the level of their edges are at most equal to 1.5 mm over an axial distance l at least equal to 2% of the axial width L.sub.0 of the triangulation ply.

Abstract: In order to improve the resistance to separation between the ends of the working plies (31 to 34) of a crown reinforcement (3) and between the edges of said reinforcement (3) and the radial carcass reinforcement (2), the said plies have axial widths which are different from each other, and at least two of the widths are greater than the axial distance (L) between the median axes (XX') of the two lateral grooves (6) closest to the edges of the tread (1) and defining lateral regions (7) where the tread (1) has a meridian profile (8) radially recessed with respect to the meridian profile (9) of the geometrical envelope of its median zone.

Abstract: A radial tire has a crown reinforcement (3) having at least two work crown lies (31, 32) of crossed inextensible metal cords, making angles of between 10.degree. and 45.degree. with the circumferential direction XX', and two limiting blocks (40) each composed of at least one ply of metal cords oriented at an angle of between 0.degree. and 10.degree., the blocks (40) being arranged in two separate regions on either side of the equatorial plane XX' and radially between the carcass reinforcement (1) and the radially outermost work crown ply (32). The two limiting blocks (40) are axially joined together by an additional reinforcement (41) which is composed of at least one ply of circumferentially oriented textile or metal cords and is centered on the equatorial plane XX', its tensile rigidity being at most equal to 0.5 times the tensile rigidity of the most extensible ply of the limiting blocks (40).

Abstract: A tire cord which is improved in rubber penetration. The cord has at least four filaments twisted together so as to form a core and a sheath surrounding the core. The filaments change place repeatedly along the longitudinal direction of the cord such that one of the filaments forms the core in a portion, but in a different portion of the cord, the same filament forms part of the sheath.

Abstract: A heavy duty radial tire having a belt layer assembly formed of at least four layers formed from steel cords. The belt layers may be divided into two groups: a group of outer layers which are disposed at an outer side in a radial direction of the tire, and a group of inner layers which are disposed at an inner side in the radial direction of the tire. Cross-sectional areas of the steel cords of at least one layer of the group of outer layers are greater than the cross sectional areas of the steel cords of the group of inner layers. The steel cords of at least one layer of the group of outer layers and the group of inner layers are provided such that ratios I/A of cross sectional secondary moments I and cross sectional areas A of the steel cords are greater than or equal to 4.5.times.10.sup.-3 mm.sup.2. Accordingly, a superior effect can be achieved in that cut resistance can be improved without deterioration in other properties of the tire.

Abstract: In a heavy duty pneumatic radial tire, when the belt is comprised of not less than three main belt layers, a belt layer other than a belt layer adjacent to a carcass is a narrow-width rigidity reinforcing layer, or when the belt is comprised of not less than four main belt layers, a belt layer adjacent to the carcass and a belt layer other than a belt layer adjacent to the belt layer are narrow-width rigidity reinforcing layers. Such a narrow-width rigidity reinforcing layer has given width and inclination cord angle.

Abstract: A pneumatic radial tire comprising a pair of bead portions and sidewall portions and a tread portion connecting the sidewalls. At least one radial carcass layer reinforcing said portions is positioned between two beads embedded in the bead portions. A belt comprises at least two layers having cords crossing each other from one layer to the next, a cap circumferentially wound having organic fiber cords therein and reinforcing rubber layers in an entire region of the side wall portions supporting a load of the tire having a crescent shaped cross section along an inner side of the carcass. At least one tie-element layer resisting force generated in width directions of the tire and having many cords oriented substantially orthogonally with respect to an equatorial plane of the tire is arranged between the belt and the cap.

Abstract: A pneumatic radial tire for airplanes comprises a toroidal carcass of at least two carcass plies, a tread rubber superimposed on the carcass, and a belt disposed between the carcass and the tread rubber, in which the belt is comprised of a plurality of radially inner belt plies and a plurality of radially outer belt plies, and each of the radially inner belt plies contains cords extending substantially zigzag at a cord angle A of 5-15.degree. with respect to the equatorial plane in the circumferential direction while radially being bent at both side ends of the ply, and each of the outer belt plies contains cords having a cord angle B larger than the cord angle A. In this tire, the occurrences of standing wave and cut peel off are prevented with the reduction of tire weight.

Abstract: A belted radial ply tire which comprises a bead core disposed in each bead portion, a carcass extending between the bead portions and turned up around the bead cores, and a belt comprising at least two cross plies disposed radially outside the carcass and inside the tread, andin a state that the tire is mounted on its regular rim and inflated to its regular inner pressure but loaded with no tire load, the effective belt width BW of the effective belt part BE of the belt, the belt edge camber height CH of the belt, and the tire section width TW satisfy2.50(BW/TW)-1.25<CH<13.3(BW/TW)-4.65.

Abstract: A pneumatic radial tire comprising a pair of bead portions and sidewall portions and a tread portion connecting the sidewalls. At least one radial carcass layer reinforcing said portions is positioned between two beads embedded in the bead portions. A belt comprises at least two layers having cords crossing each other from one layer to the next, a cap circumferentially wound having organic fiber cords therein and reinforcing rubber layers in an entire region of the side wall portions supporting a load of the tire having a crescent shaped cross section along an inner side of the carcass. At least one tie-element layer resisting force generated in width directions of the tire and having many cords oriented substantially orthogonally with respect to an equatorial plane of the tire is arranged between the belt and the cap.

Abstract: A pneumatic radial tire for airplanes comprises a toroidal carcass of at least two carcass plies, a tread rubber superimposed on the carcass, and a belt disposed between the carcass and the tread rubber, in which the belt is comprised of a plurality of radially inner belt plies and a plurality of radially outer belt plies, and each of the radially inner belt plies contains cords extending substantially zigzag at a cord angle A of 5.degree.-15.degree. with respect to the equatorial plane in the circumferential direction while axially being bent at both side ends of the ply, and each of the outer belt plies contains cords having a cord angle B larger than the cord angle A. In this tire, the occurrences of standing wave and cut peel off are prevented with the reduction of tire weight.

Abstract: In order to improve the resistance of a crown reinforcement (20) of a radial tire to perforations, cuts and the drawbacks resulting therefrom, the crown reinforcement (20) is formed of three plies (21, 22, 23) of non-stretchable metal wires or cables. The resistances R.sub.1, R.sub.2, R.sub.3 of these plies being such that1.5.ltoreq.R.sub.1 /R.sub.2 .ltoreq.2.5and0.5.ltoreq.R.sub.3 /R.sub.2 .ltoreq.1.5,the two radially outer plies (22, 23) having wires or cables separated by a distance (e) equal to at least their diameter.