Apex Or Filler Strip Patents (Class 152/541)
-
Patent number: 5180457Abstract: A pneumatic radial tire for construction vehicles comprises a radial carcass of rubberized steel cord ply, a stiffener rubber disposed on a bead core, and at least two reinforcing layers of rubberized fiber cord fabrics having different cord directions as a bead portion reinforcement. This reinforcing layer satisfies the particular height relations to the carcass ply and its turnup portion.Type: GrantFiled: February 26, 1991Date of Patent: January 19, 1993Assignee: Bridgestone CorporationInventors: Yoichi Honbo, Satoshi Yoshizaki, Motohiro Iwasaki
-
Patent number: 5114512Abstract: In the manufacture of a pneumatic tire the approximately triangular space immediately radially inward of each bead of the tire is filled by an apex construction made by helically winding uncured rubber strip. The tapered configuration is achieved by winding from a position progressively closer to a support surface so that the windings become progressively more oblique. Width reduction of the rubber strip can be achieved by subjecting it to progresively greater tension during winding. The winding of the apex formation may be interrupted while an end of a carcass play is turned over the bead and incomplete apex. Turns of unsheathed wire may be wound over the carcass ply end and then winding of the uncured rubber strip continued until the apex formation is completed. In one modification (FIG. 5) the carcass ply is incorporated in a wound bead assembly. In another (FIG. 3) windings of a harder material such as Kevlar are interposed between windings of uncured rubber.Type: GrantFiled: May 1, 1990Date of Patent: May 19, 1992Assignee: Bridgestone/Firestone Inc.Inventors: Eric Holroyd, Anthony R. Wright
-
Patent number: 5080158Abstract: The invention relates to a pneumatic radial tire for heavy duty vehicles such as trucks, buses etc., having an improved reinforced structure of bead section, which can be effectively improved in the durability under very heavy load conditions and can be recapped two or three times without damaging the base tire.The radial tire for heavy duty, comprises: a carcass ply (2) of a radial or a semi-radial construction composed of at least one rubberized metal cord ply; a first metallic cord reinforcing layer (4) disposed at the outside of the turned up portion (2') of the carcass ply (2); and a second fiber cord reinforcing layer (6) secured to the inner surface of the carcass ply main portion.The radially inner portion of the second reinforcing layer (6) is interposed by a given width (L) between the turned up portion (4') of the first reinforcing layer (4) and the main portion of the carcass ply in bead base portion.Type: GrantFiled: February 16, 1988Date of Patent: January 14, 1992Assignee: Sumitomo Rubber Industries, Ltd.Inventor: Kazuhiko Kawamura
-
Patent number: 5056575Abstract: The bead durability of the heavy duty pneumatic radial tire for truck and bus is improved by arranging a rubber stock composed of three rubbers A, B and C each having particular properties between a carcass ply and its turnup portion in the bead portion and/or rendering the turnup portion of the carcass ply in the bead portion into a particular arrangement.Type: GrantFiled: March 14, 1990Date of Patent: October 15, 1991Assignee: Bridgestone CorporationInventors: Hiroshi Yamaguchi, Shigehito Kishinami, Hiroshi Ueda, Fumio Bamba
-
Patent number: 5007472Abstract: A pneumatic radial tire characterized in that:an inner carcass layer is turned up around each bead core from inside to outside in such a manner as to wrap a bead filler therein;a steel cord reinforcing layer is disposed outside the inner carcass layer;an outer carcass layer is disposed in such a manner that it covers the outside of the steel cord reinforcing layer and its end portion extends to at least near the bead core;a second filler is disposed outside the outer carcass layer;the second filler has a hardness below that of the bead filler and within the range of 70 to 93 in terms of JIS hardness;the cord angle of the steel cord reinforcing layer is from 15.degree. to 30.degree.Type: GrantFiled: April 25, 1990Date of Patent: April 16, 1991Assignee: The Yokohama Rubber Co., Ltd.Inventors: Tetsuya Kuze, Takashi Yamashita, Toshihiko Suzuki
-
Patent number: 5005626Abstract: A pneumatic radial tire having a low noise and an improved cornering stability has a belt structure of at least two belt layers composed of at least one layer containing cords each obtained by twisting organic fibers and at least one layer containing steel cords, at least one of the organic fiber cord layers being interposed between the steel cord layer and a tread at a state that both transversely outermost end portions are folded inward. This organic fiber cord is a cord obtained by twisting high strength, high modulus polyvinyl alcohol fibers and has particular twisting coefficient and strength. The tire further satisfies a particular relation between a height of a turnup portion of a carcass ply around a bead portion and a tensile stress at 50% elongation of a bead filler rubber reinforcing the bead portion at room temperature.Type: GrantFiled: December 15, 1987Date of Patent: April 9, 1991Assignee: Bridgestone Corp.Inventors: Kazuo Oshima, Shizuo Iwasaki
-
Patent number: 4986326Abstract: A radial tire, specially for a motorcycle, comprising a carcass reinforced by a ply radially disposed cords wrapped in each of two bead regions around an annular bead core to provide a ply turn up, a tread reinforced by a breaker assembly and between the tread edges and bead region tire sidewalls wherein each sidewall includes immediately adjacent to and outwards of the carcass ply a rubber sidewall member modulus in the range 10-20 MPa and having a upper edge positioned at the edge of the breaker and a lower edge radially inwards of the carcass ply turn up edge.Type: GrantFiled: December 20, 1988Date of Patent: January 22, 1991Assignee: SP Tyres UK LimitedInventors: David R. Watkins, Gerald A. Griffiths, Peter Ingley
-
Patent number: 4962803Abstract: A pneumatic tire (10) comprising a pair of annular beads (12,12') spaced from one another with a liner (20) extending between the tire beads. A reinforcement ply (24) and a barrier ply (26) are provided extending between the beads and a circumferentially inextensible belt assembly (28) is positioned in the crown region (30) of the tire. The reinforcement ply has parallel cords (27) of aromatic polyamide material or cables of steel and the barrier ply is made from a material having a ply modulus of elasticity substantially less than that of the reinforcement ply. The parallel cords or cables of the barruier ply preferably are at an angle (.alpha.) different than the angle (.beta.) of the parallel cords or cables of the reinforcement ply.Type: GrantFiled: June 20, 1985Date of Patent: October 16, 1990Assignee: The Goodyear Tire & Rubber CompanyInventor: Thomas N. H. Welter
-
Patent number: 4953605Abstract: A radial tire for heavy loads, comprises: a pair of bead cores; a carcass the ends of which are turned up around the bead cores to form a carcass main part and a carcass turned up part on the axially inside and the outside of the bead core, respectively; a metallic cord reinforcing layer turned up around the bead core to form (a) an outside part extending along the axially outside of the carcass turned up part and (b) an inside part extending along the axially inside of the carcass main part; an outside reinforcing layer of organic fiber cords disposed axially outside the outside part of the metallic cord reinforcing layer; an inside reinforcing layer of organic fiber cords disposed on the axially inside of the carcass main part; a bead apex between the carcass main part and the turned up part extending radially outwardly beyond the radially outer end of the outside reinforcing layer; a rubber chafer disposed outside the outside reinforcing layer; and an inner sidewall disposed between the outside reinforcingType: GrantFiled: May 17, 1988Date of Patent: September 4, 1990Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Kazuhiko Kawamura, Kazuo Sato
-
Patent number: 4917166Abstract: A reinforced radial tire bead construction for heavy load vehicles, such as trucks and buses, which has excellent durability and recapability. The tire has a carcass ply turnup wrapped around a bead core and a relatively soft rubber apex strip. A steel cord reinforcing layer surrounds part of the turnup and a layer of organic fiber cords is outside the steel cord layer and extending to a greater radial height. Between the turnup ends and the inner surface of the organic cord layer is a rubber strip of relatively soft material. Between the carcass ply main portion and the soft rubber apex strip is a rubber band of relatively harder material.Type: GrantFiled: September 26, 1988Date of Patent: April 17, 1990Assignee: Sumitomo Rubber Industries, Ltd.Inventor: Munenori Iuchi
-
Patent number: 4892129Abstract: A tire unit consisting of a coreless air tire (4), containing a reinforcing ply (7), and a rim (3), the edges (8, 10) of which are permanently connected to one another solely by bonding. The part of the tire edge (8) containing the reinforcing ply is bonded to the latter only on one side of the rim. The rim edge (10) has an undercut (28) in which the tire edge (8) contains an annular reinforcement (29). A main bonding zone (23, 37) is provided in the undercut or adjacent to it on the outside. In the main bonding zone, the tangential angle (25) to the axis (1) is at no point (24) smaller than at each point which lies closer to the tire side wall (6) or smaller than the angle (20) at which the tire side wall (6) runs clear of the rim under all normal loading conditions. Moreover, a process is proposed for producing such a tire unit.Type: GrantFiled: September 16, 1987Date of Patent: January 9, 1990Inventor: Klaus Debus
-
Patent number: 4872497Abstract: An pneumatic radial tire for a passenger car having an improved durability, which tire has a carcass layer formed of aromatic plyamide cords in which an end portion of the carcass layer is turned up around an annular bead wire and a lower bead filler from the inside to the outside of the tire to form a turnup portion which is extended along the main body of the carcass layer, wherein an upper bead filler having a JIS hardness of from 75 to 95 is disposed axially outside the turnup portion, and wherein the height b (mm) of the lower bead filler relative to the height a (mm) of a rim flange upon which the tire is mounted satisfies the formula:(a-5)<b<(a+10)wherein a is the G dimension specified by JIS-D-4218-1981.Type: GrantFiled: December 22, 1987Date of Patent: October 10, 1989Assignee: The Yokohama Rubber Co., Ltd.Inventors: Ryoji Hanada, Tuneo Morikawa, Kazuyuki Kabe
-
Patent number: 4852626Abstract: To prevent bead displacement under heavy load or to improve bead durability without increasing tire weight and decreasing tire productivity, the carcass is sandwiched between two reinforcing layers near the bead in such a way that metallic cords of the carcass and the two reinforcing layers, extending in three different directions, provide a triangular reinforcement structure. The radial distance H.sub.1 of the first reinforcing layer from the rim is 0.3 to 0.7 H (where H denotes a radial distance between the rim and the maximum tire width position); the radial distance H.sub.2 of the first reinforcing layer is 0.25 to 0.6 H; the radial distance H.sub.3 between H.sub.1 and H.sub.2 is 0.05 H or more; and the radial overlap distance .alpha. between two reinforcing layers is 0.1 H or more. Further, the overlap length l between the two layers is 0.25 L or more (where L denotes the width of the first reinforcing layer).Type: GrantFiled: September 23, 1987Date of Patent: August 1, 1989Assignee: Bridgestone CorporationInventor: Tetsuhito Tsukagoshi
-
Patent number: 4842033Abstract: A pneumatic tire having gum strips (19,21) for encapsulation of the cut edge of a cord reinforced ply (14), in particular a carcass ply. The gum strips are formed from an elastomeric compound having physical properties such that its 300% Modulus (ASTM D412) is comprised between 5 and 7 MPa and its Shore A Hardness (ASTM D1415) is comprised between 55 and 65. It has been found that such gum strips when used in the bead portion (11) of a tire to encapsulate the ply end (18), improve the durability of the tire.Type: GrantFiled: November 16, 1987Date of Patent: June 27, 1989Assignee: The Goodyear Tire & Rubber CompanyInventor: Gia V. Nguyen
-
Patent number: 4824899Abstract: A rubber composition suitable for use in a bead filler of a tire comprises particular amounts of a reinforcing carbon black, sulfur and acrylic acid metal salt based on 100 parts by weight of natural rubber or a blend of synthetic diene rubber therewith.Type: GrantFiled: November 18, 1987Date of Patent: April 25, 1989Assignee: Bridgestone CorporationInventor: Takuo Yasuda
-
Patent number: 4790366Abstract: In a pneumatic radial tire for heavy duty vehicles having a pair of bead portions, each of the bead portions comprises at least first, second and third chafer plies disposed around the carcass. The third chafer ply has a cord angle larger than those of the first and second chafer plies. The first, second and third chafer plies have a first chafer height h.sub.1 measured in the radial direction from a laterally outward and radially outermost end of the first chafer ply to a heel point at which a bead base of the bead portion and a flange portion of a rim having mounted the bead base thereon are intersected with each other, a second chafer height h.sub.2 and a third chafer height h.sub.3, respectively. The carcas has a fold-back height H measured in the radial direction from a radially outermost end of the fold-back portion thereof to the heel point, the first, second and third chafer heights h.sub.1, h.sub.2 and h.sub.Type: GrantFiled: October 25, 1985Date of Patent: December 13, 1988Assignee: Bridgestone CorporationInventor: Kuninobu Kadota
-
Patent number: 4779659Abstract: A radial tire for passenger cars comprising a turnup portion of a carcass layer provided along the body of the carcass layer at a bead portion which has not been folded back and an upper bead filler provided outside the turnup portion, wherein the upper bead filler has a textile cord layer on both of its inside and outside, thereby holding the upper bead filler between the textile cord layers.Type: GrantFiled: April 28, 1987Date of Patent: October 25, 1988Assignee: The Yokohama Rubber Co., Ltd.Inventors: Ryoji Hanada, Sadakazu Takei
-
Patent number: 4766940Abstract: A radial tire for passenger cars comprising a rubber filler interposed between a turn-up portion of a carcass ply wound around a bead ring from the inside toward the outside thereof and the carcass ply and having a dynamic modulus of elasticity of at least 300 kg/cm.sup.2 and comprising an additional layer closely adhered to said rubber filler and composed of cords having a high modulus of elasticity which is larger than 2.5.times.10.sup.5 kg/cm.sup.2 and inclined at an angle within a range between 45.degree. and 75.degree. with respect to the carcass cord, the additional layer being arranged over a range which is 50% to 75% of the tire sectional height.Type: GrantFiled: February 6, 1987Date of Patent: August 30, 1988Assignee: Bridgestone Tire Company LimitedInventors: Hideki Yokoyama, Tatsuro Shimada, Masao Nakagawa
-
Patent number: 4762158Abstract: A heavy duty pneumatic radial tire includes a carcass consisting of at least one layer of metal cords substantially radially arranged, a breaker consisting of at least two layers of metal cords to form a main reinforcement with the carcass, and bead portions including hard and soft stiffeners. The carcass has a particular radial profile having a ratio of radii R/R' determined by a radius R' of a standard circle and a radius R determined by a particular definition and has a maximum distance f between an arc of the standard circle and the remaining carcass line smoothly extending from the profile curvature of the shoulder. Moreover a radial profile over a radially inner zone of the sidewall of 20-45% of the radial height SH has a curvature 1/.rho. less than 6.times.10.sup.-3 mm.sup.-1 at a location 32.5% of the radial height corresponding to a center of the profile.Type: GrantFiled: March 11, 1986Date of Patent: August 9, 1988Assignee: Bridgestone CorporationInventors: Shinichi Furuya, Kuninobu Kadota, Minoru Togashi, Kenshiro Kato
-
Patent number: 4747436Abstract: A tire having a pair of axially spaced-apart bead regions each reinforced by an annular bead hoop around which one edge of a carcass reinforcing ply is wrapped and a filler strip positioned in the axially outer region of the bead. The filter strip which extends circumferentially around the bead, has one edge radially inwards of the bead hoop and one edge axially outwards of the bead hoop characterized in that the filler strips in both beads have their cords laid at an angle to the same specified direction circumferentially such that the cords of one filler strip are substantially parallel to the cords of the other filler strip. The tire has an external direction marker in the same circumferential direction to the specified direction so that in use the tire may be fitted to a vehicle with the marker in the opposite direction to the greatest torque force from the wheel. The filler strip may be cut edge tire cord fabric or a single cord laid in a zig-zag to form the fabric.Type: GrantFiled: February 28, 1986Date of Patent: May 31, 1988Assignee: SP Tires UK LimitedInventor: Arthur R. Williams
-
Patent number: 4726408Abstract: The invention relates to a pneumatic radial carcass type tire for heavy duty use having an improved reinforcing structure for the bead region. In a tire comprising a four ply radial carcass (1), the two bead regions are each reinforced by a bead core (2) and an axially inner (6) and an axially outer (7) textile reinforcing layer and a rubber apex strip (8). As compared to the prior art, the relatively low rubber apex strip (8) and the resulting low separation point between the first (3) and second (4) set of carcass plies reduces the sheer stresses between these carcass plies while the specific arrangement of the axially inner (6) and axially outer (7) reinforcing layers retains the required stiffness in the bead region (5). A particular durable bead region (5) is thus obtained.Type: GrantFiled: June 1, 1987Date of Patent: February 23, 1988Assignee: The Goodyear Tire & Rubber CompanyInventors: Jean-Claude Alie, Romain Geisen, Andre Lamock
-
Patent number: 4721144Abstract: A pneumatic radial tire for passenger car having an improved riding comfort against vibration without substantially degrading the cornering stability is disclosed, which comprises a bead filler disposed between the carcass and its turnup, at least a part of which has a complex modulus of elasticity of 1.times.10.sup.8 .about.8.times.10.sup.8 dyn/cm.sup.2 and a sin .delta. of not less than 0.28 under a strain energy of 10.sup.4 dyn/cm.sup.2.Type: GrantFiled: April 10, 1985Date of Patent: January 26, 1988Assignee: Bridgestone CorporationInventors: Hideo Hara, Motonori Bundo, Yoshihiro Makino
-
Patent number: 4716950Abstract: A radial tire for a passenger car characterized in that an upper filler is disposed on a bead filler positioned on a bead wire buried in each bead portion of the tire, and a single steel reinforcing layer is interposed between the upper filler and the bead filler so that it extends from outside the upper filler to the inside of the bead filler and its height H from a bead heel does not exceed 50% of a sectional height T of the tire.Type: GrantFiled: March 24, 1986Date of Patent: January 5, 1988Assignee: The Yokohama Rubber Co., Ltd.Inventors: Tuneo Morikawa, Tetsuya Kuze
-
Patent number: 4711285Abstract: 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.Type: GrantFiled: July 10, 1985Date of Patent: December 8, 1987Assignee: Bridgestone CorporationInventors: Masaki Ogawa, Takabumi Kudo
-
Patent number: 4706724Abstract: A pneumatic tire for motorcycles is disclosed, which comprises a tread portion defining a maximum width of the tire, a pair of sidewall portions, a pair of bead portions, a carcass of radial or semi-radial structure composed of at least one rubberized cord ply containing organic fiber cords therein, and a belt superimposed about a crown region of the carcass and composed of at least one cord layer containing cords with a modulus of elasticity of at least 600 kgf/mm.sup.2 arranged at an angle of not more than 30.degree. with respect to the equatorial plane of the tire, and has an aspect ratio of not more than 86%.Type: GrantFiled: December 9, 1985Date of Patent: November 17, 1987Assignee: Bridgestone Tire Company LimitedInventors: Shinichiro Ohkuni, Shinichi Tamada
-
Patent number: 4706725Abstract: A pneumatic semi-radial tire for motorcycle is disclosed, which comprises a tread, a pair of sidewalls, a carcass composed of at least one rubberized ply containing organic fiber cords inclined at an angle of 50.degree.-85.degree. with respect to the equatorial plane of the tire, and a belt disposed between said tread and said carcass at a width corresponding to a tread width and composed of at least two rubberized plies each containing cords with a modulus of elasticity of at least 600 kg/mm.sup.2 arranged at an inclination angle of 15.degree.-30.degree. with respect to the equatorial plane of the tire.Type: GrantFiled: January 30, 1984Date of Patent: November 17, 1987Assignee: Bridgestone Tire Company LimitedInventors: Shinichiro Okuni, Yoichi Kitazawa
-
Patent number: 4705091Abstract: Heavy duty pneumatic radial tire which has the feature as follows: a pair of bead cores; a carcass ply which is composed of steel cords being turned up around the bead core from the inside toward the outside and disposed with respect to the radial direction; a belt layer whose cords are disposed at a comparative low angle with respect to the equatorial line of the tire and a steel cord reinforcing layer disposed adjacent to the outside of the turned up portion of the carcass ply, the height ho of the said turned up portion from the bead base portion is within a range of between 55 mm and 80 mm.The rubber thickness t which is between the carcass ply itself and its turned up portion, is at a certain height h from the bead base portion, t/h decreases gradually in inverse proportion to values of h/h0 within the range of 0.3.ltoreq.h/h0.ltoreq.0.5 or 0.3.ltoreq.h/h0.ltoreq.0.8, and takes an approximate constant value from 0.1 to 0.25 within the range of 1.0.ltoreq.h/h0>0.5 or 1.0.ltoreq.h/h0>0.8.Type: GrantFiled: July 24, 1985Date of Patent: November 10, 1987Assignee: Sumitomo Rubber Industries, Ltd.Inventor: Munenori Iuchi
-
Patent number: 4700764Abstract: A heavy duty pneumatic radial tire for use in airplanes and the like is disclosed, which comprises a toroidal radial carcass, a belt superimposed about a crown region of the carcass and composed of at least three cord layers, and a bead portion reinforcement consisting of a stiffener composed of a hard rubber stock and a soft rubber stock, a main chafer made from aromatic polyamide fiber cords, and an auxiliary chafer of at least two cord layers covering the outside of said main chafer and at least one cord layer arranged along the inside of the turnup portion as an inner cord layer, and having such a triangular truss structure that cords of at least two cord layers are arranged at inclination angles of 65.degree..about.90.degree. and 35.degree..about.55.degree. with respect to the meridional plane of the tire, respectively, and cords of the remaining cord layer are arranged at an inclination angle of -50.degree..about.70.degree. with respect to the meridional plane.Type: GrantFiled: February 4, 1986Date of Patent: October 20, 1987Assignee: Bridgestone CorporationInventors: Kazuyuki Endo, Motoaki Taniguchi, Masanobu Takahashi, Shigeki Yamada, Kenshiro Kato
-
Patent number: 4699194Abstract: A pneumatic radial type tire for heavy vehicles having improved durability in its bead section. This tire comprises at least one carcass ply of metallic cords arranged in a substantially radial direction of the tire, at least one chafer of rubberized metallic cords disposed at the outside of the turn-up portion of the carcass ply, one carcass reinforcing member of rubberized metallic cords secured to the inner surface of the carcass ply main portion in the bead section with respect to the axial direction of the tire, which is crossed with the carcass ply cords at an angle of 10.degree.-50.degree..Type: GrantFiled: June 26, 1985Date of Patent: October 13, 1987Assignee: Sumitomo Rubber Industries, Ltd.Inventor: Munenori Iuchi
-
Patent number: 4688616Abstract: A reinforced radial tire bead construction for heavy load vehicles, such as trucks and buses, which has well-balanced rigidity and excellent durability and recapability. The tire has a carcass ply turned up around a pair of bead cores and a first reinforcing layer composed of rubber-coated steel cords, and a second reinforcing layer composed of rubber-coated organic fiber cords and a relatively soft apex strip. The first reinforcing layer surrounds the turned-up portion of the carcass ply and the second reinforcing layer of organic fiber cords is radially outside the first reinforcing layer, and is substantially continuously extended from a height covering both the radially outermost ends of the first reinforcing layer and the turned-up portion of the carcass ply to the inner surface of carcass ply main portion through the bead base.Type: GrantFiled: September 11, 1985Date of Patent: August 25, 1987Assignee: Sumitomo Rubber Industries Ltd.Inventor: Munenori Iuchi
-
Patent number: 4669519Abstract: A pneumatic radial tire is adapted to improve or reduce the rolling resistance and simultaneously to improve the steering stability and riding comfortability against vibration during running without adversely affecting the wet performance and durability by making higher the carcass maximum width position and the carcass curvature reverse position, or enlarging the curvature of the carcass in the radially outer zone of the carcass maximum width position and simultaneously the carcass curvature reverse extent in the radially inner zone of the sidewalls so as to intentionally deviate from the naturally equilibrated configuration.A method of manufacturing a reduced rolling resistance pneumatic radial tire uses a mold for vulcanizing and forming the tire therein, which mold has a particular shape of cavity having a foot width 20-50% wider than a rim width and diverging progressively from shoulder corresponding portions to the wider foot portion of the cavity.Type: GrantFiled: April 3, 1985Date of Patent: June 2, 1987Assignee: Bridgestone Tire Co., Ltd.Inventors: Minoru Togashi, Kenshiro Kato, Shin-ichi Furuya
-
Patent number: 4640329Abstract: Radial tires for motorcycles comprising a tread portion, side wall portions, bead portions, a carcass, a breaker, and optionally a reinforcing cord layer arranged outside the carcass and extending from one bead portion to the other bead portion and bead apexes made of a hard rubber, said tread portion having a plurality of longitudinal grooves in the circumferential direction at an angle of at least 5.degree. with respect to the cords of the most outer ply of the breaker. The motorcycle radial tires of the invention have an improved transverse stiffness at the side wall portions and moreover do not cause cracks at the bottom of the grooves in the tread portion.Type: GrantFiled: August 13, 1984Date of Patent: February 3, 1987Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Eiji Nakasaki, Hisashi Shirashoji, Katsuyuki Hoshikawa, Takao Kamijo, Kazushige Ikeda, Yasuhiro Inoue, Takeo Kato
-
Patent number: 4630663Abstract: A pneumatic radial ply tire in which the body ply is formed of a low twist yarn having between three and six turns-per-inch. The body ply terminates in relatively low turn-up ends extending along the side walls a distance between 10% and 30% of the tire section height and out of the area of cyclic stress and oscillation in the side walls of the tire. A relatively high, wide and hard bead filler is located within a bead portion of the tire and has a height between 20% and 50% of the tire section height with a width of between 15% and 35% of the bead filler height. The bead filler has a hardness of between 75 and 98 on the Shore A scale. The ply yarn preferably is polyester and the individual low twist strands are arranged in a parallel relationship and is preferably free of transverse cross strands known as wefts or picks. The combination of low twist yarn, low turn-up body ply ends and bead filler size and hardness provides a tire having increased durability and uniformity at a lower cost.Type: GrantFiled: November 27, 1984Date of Patent: December 23, 1986Assignee: The Firestone Tire & Rubber CompanyInventors: Thomas W. Bell, Louis W. Shurman
-
Patent number: 4627479Abstract: A pneumatic radial ply tire in which the body ply is formed of a low twist yarn having between two and five turns-per-inch. The body ply terminates in relatively high turn-up ends extending along the side walls a distance between 35% and 65% of the tire section height and out of the area of cyclic stress and oscillation in the side walls of the tire. A relatively high, narrow and hard bead filler is located within a bead portion of the tire and has a height between 20% and 50% of the tire section height with a width of between 5% and 25% of the bead filler height. The bead filler has a hardness of between 75 and 98 on the Shore A scale. The ply yarn preferably is Nylon and the individual low twist strands are arranged in a parallel relationship and is preferably free of transverse cross strands known as wefts or picks. The combination of low twist yarn, high turn-up body ply ends and bead filler size and hardness provides a tire having increased durability and uniformity at a lower cost.Type: GrantFiled: November 27, 1984Date of Patent: December 9, 1986Assignee: The Firestone Tire & Rubber CompanyInventors: Louis W. Shurman, Thomas W. Bell
-
Patent number: 4609023Abstract: A pneumatic tire (A) includes a body having a crown (10) with a ground-engaging tread portion (20), a pair of sidewall portions (12, 14), as well as a pair of bead portions (16, 18). An annular substantially inextensible bead reinforcing member (36) is positioned in each of the bead portions (16, 18). A carcass ply (30) is positioned in each sidewall (12, 14) and the crown (10) and extends from one of the bead portions (16) to the other of the bead portions (18). A first elastomer reinforcing member (50) is positioned in each bead portion (16, 18) and is disposed axially outwardly of the carcass ply (30) and adjacent the bead reinforcing member (36). A second elastomer reinforcing member (60) is positioned in each bead portion (16, 18) with at least a portion of the second member being disposed axially inwardly of the carcass ply (30) and extending radially outwardly from adjacent the bead reinforcing member (36).Type: GrantFiled: December 19, 1984Date of Patent: September 2, 1986Assignee: The Goodyear Tire & Rubber CompanyInventor: Robert P. Loser
-
Patent number: 4580610Abstract: A tire, which may be pneumatic or non-pneumatic, having beads which are each provided with an elastic annular member axially and radially inwardly of the associated bead core. The carcass ply is wrapped axially outwards of the bead core and part of the annular member.The tire bead seat has a taper angle which is greater than that of the rim bead seat such that on fitment of the tire to the rim the annular member, and the associated edge of the ply rotate around the bead core and cause the carcass ply to be placed in tension.Type: GrantFiled: October 6, 1982Date of Patent: April 8, 1986Assignee: Dunlop LimitedInventor: William L. Jackson
-
Patent number: 4541467Abstract: A heavy duty pneumatic radial tire is disclosed, which comprises a tread portion, a pair of side portions, a pair of bead portions each reinforced with a bead ring, a radial carcass ply, a metal cord reinforcing layer and a composite rubber filler. In this tire, the carcass ply is a rubberized layer of aromatic polyamide fiber cords and a tip of its turnup portion terminates at a position lower than an upper end of a rim flange when the tire is mounted on a rim. In the metal cord reinforcing layer, one end facing the turnup portion terminates over the tip of the turnup portion and the other end facing the carcass ply extends toward the side portion over a position corresponding to the above-mentioned one end facing the turnup portion.Type: GrantFiled: February 16, 1984Date of Patent: September 17, 1985Assignee: Bridgestone Tire Company LimitedInventors: Masao Nakamura, Kenji Karato