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公开(公告)号：JPH06286426A
公开(公告)日：1994-10-11
申请号：JP7234093
申请日：1993-03-30
Applicant: BRIDGESTONE CORP
Inventor： INADA NORIO , SAWADA HIROKI
Abstract: PURPOSE:To provide a pneumatic radial tire which satisfies the drastic light weight of its bead portions and the easiness, of its abandonment being compatible with anti-bead breakage safety. CONSTITUTION:In the case of a pneumatic radial tire equipped with bead portions having bead reinforcing members, the bead reinforcing members are composed of fibre-resin complex material cords A formed by embedding fiber cords formed of aromatic polyamide fiber cords in resin. In addition, the ply coefficient Nt of each fiber cord 1 is 0 X10 , and T expresses a ply number (time/10cm), and D expresses the total denier of fiber, and rho expresses the density of fibre).
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公开(公告)号：JPH058609A
公开(公告)日：1993-01-19
申请号：JP23045591
申请日：1991-09-10
Applicant: BRIDGESTONE CORP
Inventor： INADA NORIO , IWASAKI SHIZUO , KIKUCHI MICHITSUGU
Abstract: PURPOSE:To improve the driving stability by composing a belt reinforcement layer with a specific fiber, and by burying a cord made by stranding a specific fiber-resin compound material element wire in a rubber. CONSTITUTION:On a carcass layer of the cord angle 75 deg. to 90 deg., at least one layer of plural belt reinforcement layers crossing at the cord angle 10 deg. to 35 deg. is composed of a fiber selected from a carbon fiber and the like, and burying a cord made by stranding a fiber-resin compound material element wire of the diameter D 0.2 to 0.55mm of a circular section in a single stranding structure of 1Xn (n is 2 to 5) lines at a stranding pinch 1 of 5 to 30mm, which is made by covering and burying an unstranding filament bandle consisting of a fiber filament of the yarn tensile strength 15g/d or higher, and the tensile elastic modulous 250g/d or high, with an impregnant, and it satisfies the formulas I and II [where SF is the strength of the above compound material element wire, Sr is the yarn strength prior to covering and burying with the impregnate, SC is the strength of the cord after the stranding (kg), EC is the breaking ductility (%) at the breakdown, and N is the count (number/5cm) of the belt reinforcement layer crown center].
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公开(公告)号：JPH0291276A
公开(公告)日：1990-03-30
申请号：JP22045388
申请日：1988-09-05
Applicant: BRIDGESTONE CORP
Inventor： NISHI TOMOHISA , INADA NORIO
IPC: B60C9/00 , B29D30/40 , D06M15/41 , D06M15/693 , D06M101/00 , D06M101/16 , D06M101/30 , D06M101/34
Abstract: PURPOSE:To prevent deterioration in tenacity of a cord consisting of ultrahigh- tenacity 6-nylon for reinforcing rubber after vulcanization by subjecting the above-mentioned cord to dipping treatment in a resorcin-formaldehyde/latex(RFL) treating solution containing a specific latex. CONSTITUTION:A cord consisting of 6-nylon or 6,6-nylon having >=11.5g/d raw yarn strength for reinforcing rubber is subjected to dipping treatment in an RFL. In the process, a treating solution containing (A) a vinylpyridine-butadiene- styrene terpolymer latex and (B) a polyisoprene-based latex at >=0.3, preferably >=0.4 solid weight ratio of the components B/A+B and the solid weight ratio of the component (A) to the total weight of the RFL dipping solution within the range of 0.03-0.2 is used as the latex component to prevent the tenacity of the vulcanized cord from deteriorating.
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公开(公告)号：JPH01257605A
公开(公告)日：1989-10-13
申请号：JP31144388
申请日：1988-12-09
Applicant: BRIDGESTONE CORP
Inventor： KADOTA KUNINOBU , IMAI ISAMU , INADA NORIO
Abstract: PURPOSE:To improve eccentric wear resistance and cut resistance and the like of the title tyre by crossing plural rubberized layers consisting of a cord made of specific material, having specific strength and initial modulus respectively at a specific cord angle, to the equatorial surface of the tyre so as to form a belt layer. CONSTITUTION:A tyre is provided with a carcass 1 with toroidal radial construction consisting of mutually parallel plural ply of organic fibre cord. A tread 3 is reinforced by belts 2 for surrounding the crown of the carcass 1. In this case, the belts 2 are formed by crossing the specific plural rubberized layers with each other a specific angle. In other words, each rubberized layer uses so-called 66 nylon polymer and is formed with a cord having the characteristic in which strength is 9.0g/d or more the status of a dipped cord treated by a binding agent after thread plying and initial modulus is less than 80g/d. The cord angle of each rubberized layer to the equatorial surface of the tyre is set within a range from 10 deg. to 70 deg..
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公开(公告)号：JPS62251201A
公开(公告)日：1987-11-02
申请号：JP9220586
申请日：1986-04-23
Applicant: BRIDGESTONE CORP
Inventor： INADA NORIO , IMAI ISAMU , YAMADA SHIGEKI , KATO KENSHIRO
Abstract: PURPOSE:To prevent reduction in strength and obtain good adhesion between a cord and rubber by using a specific aromatic polyamide fiber, specifying the total denier number and the number of final twist to form a cord, and embedding said cord into a specific cord to form a carcass ply. CONSTITUTION:A toroidal carcass ply has a folded part in which only one sheet of cord layer is wound back from the inside to the outside of a tire around a bead core. The sheet of cord layer is formed by embedding, into rubber aromatic polyamide fibers which are providing mutually in parallel and nearly perpendicular to the circumferential direction of the tire. In such a structure, the cord layer is formed by using an aromatic polyamide fiber having 40mol% or above of repeated units represented by the formula I in a molecule, with the total denier number D being D>25,000 while the number of twist being two or three. And, adhesive treated cords are embedded, while being arranged in parallel, in rubber having a modulus of 100% of 40-60kg/cm .
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Patent Agency Ranking
公开(公告)号：JP2000264012A
公开(公告)日：2000-09-26
申请号：JP7071199
申请日：1999-03-16
Applicant: BRIDGESTONE CORP
Inventor： INADA NORIO
Abstract: PROBLEM TO BE SOLVED: To improve the run-flat traveling performance by using a cord of poly-olefin-ketone fiber substantially consisting of repetitive units for at least one of radial carcass ply layers from one side wall to the other side wall through a crown part. SOLUTION: A bead portion of a pneumatic safety tire 10 is fitted to a flange of a rim 30, a tread portion 24 is brought into contact with the ground with a shoulder 26 of the tread portion as an end portion, side walls 16 are continuously arranged inwardly in the radial direction from both ends of a cylindrical crown portion, and a portion from one of the side walls to the other one comprises two radial carcass ply layers 18. The cord forming at least one of them contains the poly-olefin ketone(POK) fiber. This fiber is high in strength and elasticity, and excellent in dimensional stability, small in thermal shrinkage, good in water resistant stability, excellent in adhesivity to rubber, excellent in amine degradation resistance, and excellent in run-flat traveling property.
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公开(公告)号：JPH06278415A
公开(公告)日：1994-10-04
申请号：JP7045793
申请日：1993-03-29
Applicant: BRIDGESTONE CORP
Inventor： SAWADA HIROKI , INADA NORIO
Abstract: PURPOSE:To aim at a drastic weight lightening of a tire bead and improve low fuel consumption by using a complex cord, which is a combination of a fiber made from a heterocycle contained aromatic polymer containing a specific fiber strength and a polyamide resin through a specific mode, as a bead wire. CONSTITUTION:A complex cord of a fiber made from a hetrocycle contained aromatic polymer of a fiber strength of 18g/D or more and a polyamide resin is used as a bead wire for a radial tire. This complex cord is formed by completely coating a PBO fiber, which is the core material, with a polyamide resin and the volumetric ratio of the fiber in one bead wire is set within the range of 30% to 70%. The above mentioned resin coated wire is further formed so that it can be held by leaving a space between them with an insulation rubber which rubber hardness is 82 to the like are used as a fiber made from a heterocycle contained aromatic polymer.
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公开(公告)号：JPH05186926A
公开(公告)日：1993-07-27
申请号：JP5260992
申请日：1992-03-11
Applicant: BRIDGESTONE CORP
Inventor： YOSHIDA HIROTO , INADA NORIO
IPC: B60C9/00 , C08J5/12 , C08K7/00 , C08K7/02 , C08L21/00 , D01F6/60 , D02G3/40 , D02G3/48 , D06M15/693 , D06M101/00 , D06M101/16 , D06M101/30 , D06M101/34
Abstract: PURPOSE:To provide the subject cord causing no strength drop-off in its dipping and curing processes, also excellent in the fatigue resistance under repeated compressive strain. CONSTITUTION:The objective cord
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公开(公告)号：JPH059881A
公开(公告)日：1993-01-19
申请号：JP23045891
申请日：1991-09-10
Applicant: BRIDGESTONE CORP
Inventor： KIKUCHI MICHITSUGU , INADA NORIO , IWASAKI SHIZUO
Abstract: PURPOSE:To obtain pneumatic radial tires having increased high-speed performances, improved flex fatigue resistance and maneuvering stability by using organic yarn as a belt material. CONSTITUTION:Pneumatic tires using an elliptic or rectangular cord which is prepared by impregnating and coating a cord-like yarn bundle comprising a great number of filaments having >=15g/d tensile strength and 1-15 denier fineness of filament with 30-70 % resin having elastic modulus in tension having a flatness ratio of cross sectional shape of major axis (b)/ minor axis (a) of 1.5-5 as cord for belt reinforcing of at least one layer.
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公开(公告)号：JPH04110208A
公开(公告)日：1992-04-10
申请号：JP22846290
申请日：1990-08-31
Applicant: BRIDGESTONE CORP
Inventor： IWASAKI SHIZUO , INADA NORIO
Abstract: PURPOSE:To reduce the weight and raise the rolling resistance of pneumatic radial tyre by making inwading convex the vicinity of a crown center at the time of no internal pressure and specifying the relation between difference the outside diameter of the convex part and the maximum outside diameter of the center portion, and the tensile elastic modulus of the cord in the belt reinforcement layer, and also specifying the specific gravity of the cord respectively. CONSTITUTION:In a tyre having a belt reinforcement layer consisting of two layers or more with an organic fiber cord disposed at an angle of 0-40 deg., the specific gravity of a cord taken out from at least one layer or one belt reinforcement layer is set to 2.0 or less and the tensile elastic modulus E is set to 1000kg/mm or higher. Moreover, the vicinity of a crown center at the time of no internal pressure is made inwardly convex. The relation 0 ) is the tensile elastic modulus of the cord in the belt reinforcement layer which is taken out of the tyre.
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