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公开(公告)号：JPH09263113A
公开(公告)日：1997-10-07
申请号：JP28871396
申请日：1996-10-30
Applicant: BRIDGESTONE CORP
Inventor： KATO KENSHIRO
IPC: B60C9/08 , B60C3/04 , B60C9/18 , B60C9/20 , B60C15/00 , B60C15/02 , B60C15/024 , B60C15/04 , B60C15/06
Abstract: PROBLEM TO BE SOLVED: To improve durability of a bead and drive stability by a method wherein the outside surface part, positioned facing the inner curved surface of the inclination rise part of a rim, of the side rubber of the bead part constitut ing part of a tire is formed in a recess-form curved surface, in a tire applicable for a well base rim on which a taper having a specified angle is formed. SOLUTION: A 15 deg. taper radial for a truck and a bus is a tubeless (T/L) tire and a well base rim (a 15 deg. well base rim) being remarkably lowered compared with a wide flat base rim is applicable. In this case, in the side rubber 5 of the constituting member of bead part 1, a recess-form curve surface 13 is formed at the outer surface part of a rubber tube 6. In this case, a curvature medium R1 of the arcuate part, containing the apex, of a plurality of arcuate circles of the recess-form curved surface part of preferably the side rubber 5 and a curvature radius R, forming a main inner cured line, of a flange in the cross section of an applicable rim satisfy a relation of 0.4×R
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公开(公告)号：JPH06239114A
公开(公告)日：1994-08-30
申请号：JP2549993
申请日：1993-02-15
Applicant: BRIDGESTONE CORP
Inventor： KATO KENSHIRO , YAMAMOTO MASAHIKO
Abstract: PURPOSE:To prevent the form collapse or a bead and to reduce a shearing strain generated at the ply end, by making the modulus at 20% extension of a cushioning rubber provided between a bead core complex and the ply of a carcass smaller than a neighboring lap rubber and a bead filler rubber. CONSTITUTION:A bead core 4 made by coiling by attaching a covering rubber 3 around bead wires 2 is buried in a lap rubber 5 which has the modulus at 20% extension higher than the covering rubber 3, so as to form a bead core complex 6. A cushioning rubber 9 is provided around the bead core complex 6, and the ply of a carcuss is wound and rewound around the cushioning rubber 9, so as to unify together with a bead filler rubber 8. The covering rubber 9 is formed of a rubber with the quality whose modulus at 20% extension is smaller than the neighboring lap rubber 5 and the bead filler rubber 8. Consequently, a shearing strain generated to the fly end when the tire gets a load can be reduced so as to improve the durability, and the form collapse of the bead can be prevented.
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公开(公告)号：JPS6349504A
公开(公告)日：1988-03-02
申请号：JP19217386
申请日：1986-08-19
Applicant: BRIDGESTONE CORP
Inventor： KATO KENSHIRO , YAMADA SHIGEKI , INADA NORIO , IMAI ISAMU
Abstract: PURPOSE:To improve the antifatigueness by forming the cords used in the specific width region of a belt reinforced body surrounding the crown part of a carcass ply from the aromatic polyamide fibers consisting of a plurality of units represented by the specific chemical formulas. CONSTITUTION:One ply layer of a carcass ply has a turned-over part 3 on the periphery of a pair of bead cores. A belt reinforced body surrounding the crown part of the carcass ply is formed by laminating the belt layers consisting of the aromatic polyamide cords and extended in the tire width direction to a shoulder part. The cord used in all the width part of the belt layers on the outside in the radial direction for the neutral axis related to the bending in the peripheral direction of the belt reinforced body and in the width region containing at least the belt edge of the belt layers having the belt width over 0.8 times of the max. grounded width is formed from the aromatic polyamide fibers consisting of the units A and B represented by the formulas I and II.
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公开(公告)号：JPS6349503A
公开(公告)日：1988-03-02
申请号：JP19217286
申请日：1986-08-19
Applicant: BRIDGESTONE CORP
Inventor： KATO KENSHIRO , YAMADA SHIGEKI , TANIGUCHI MOTOAKI , ENDO KAZUYUKI
Abstract: PURPOSE:To improve the antifatigueness of a belt cord by installing a belt reinforced body consisting of the aromatic polyamide cords surrounding the crown part of a carcass ply and setting the torsional coefficient of the cord used in the specific width region to a specific value. CONSTITUTION:One ply layer 1a forming a troidal-shaped carcass ply 1 has a turned-over part 3 on the periphery of a pair of bead cores 2. The crown part 4 of the carcass ply 1 has a belt reinforced body 5 consisting of the aromatic polyamide cords surrounding in parallel to the equator of the tire. In this case, the torsional coefficient of the cord used in all the width part of the belt layers 5d-5f on the outside in the radial direction for the neutral axis 7 related to the bending in the peripheral direction of the belt reinforced body 5 and in the width region B containing at least the belt edge of the belt layers 5a-5c having the belt width over 0.8 times of the max. grounded width is set to 1.2-1.8 of the torsional coefficient of the cord used in the rest belt width region.
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公开(公告)号：JPS62265005A
公开(公告)日：1987-11-17
申请号：JP10861886
申请日：1986-05-14
Applicant: BRIDGESTONE CORP
Inventor： KATO KENSHIRO , SAITO TADASHI , KIJIMA KEN , TAKAHASHI MASANOBU , YAMADA SHIGEKI
Abstract: PURPOSE:To improve durability, by specifying a thickness of a base rubber in a direction of normal line of the outermost belt layer in a prescribed area from the center of the maximum width made contact with the ground and specifying property of a base rubber, a cap rubber and a belt covering rubber in the captioned tire for an aircraft or the like. CONSTITUTION:The thickness of a base rubber layer 4 is set to 10-35% of the total thickness of a base rubber layer 4 and a cap rubber layer 5 with respect to lines N2-N4 normal to the belt layer 3 of the outermost layer within the area of 0.35 times-0.525 times of the maximum width W made contact with the ground. A tangent loss at a normal temperature after curing is set at 0.17 or less to the base rubber layer 4, at 0.22 or less to the cap rubber layer 5 and at 0.15 to the rubber covering the belt 3. The 100% modulus of the base rubber layer 4 is set to 60-80% of the cap rubber layer 5 and 40-70% of the belt covering rubber. With this arrangement, durability property at the time of a high speed traveling and overloading is improved.
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Patent Agency Ranking
公开(公告)号：JPS62225405A
公开(公告)日：1987-10-03
申请号：JP6596686
申请日：1986-03-26
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI , KATO KENSHIRO , IMAI ISAMU , INADA NORIO
Abstract: PURPOSE:To improve durability and controllability by arranging a cord which is formed by adjusting aromatic polyamide fiber having the specified mechanism with the specified twist coefficient, at the specified cord angle so as to constitute a carcass ply, in a tyre described in the caption for an aircraft. CONSTITUTION:A carcass ply cord is constituted by setting the cord twist coefficient NT for aromatic polyamide fiber having mechanism shown by formula I and formula II, in the range of 0.4-0.53. And this cord is arranged at an angle of 5-15 deg. to the radial direction and a inner carcass ply cord 7 and an outer carcass ply cord 6 are so laminated as to cross each other so as to constitute the carcass ply 5. By this constitution, the durability and controllability can be improved.
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公开(公告)号：JPS6261805A
公开(公告)日：1987-03-18
申请号：JP20318085
申请日：1985-09-13
Applicant: BRIDGESTONE CORP
Inventor： YAMADA SHIGEKI , TANIGUCHI MOTOAKI , TAKAHASHI MASANOBU , KATO KENSHIRO
IPC: D02G3/02 , B29D30/40 , B60C1/00 , B60C9/00 , B60C9/04 , B60C9/08 , B60C9/20 , C08G69/32 , C08J5/04 , D02G3/48
Abstract: PURPOSE:To improve durability and reduce weight by forming a ply layer from the fiber made of aromatic polyamide represented by a specific formula and a covering rubber having the prescribed characteristics with a specific composition, in a radial tire for an aeroplane. CONSTITUTION:A ply layer is constituted by covering the cord prepared form the fiber made of the aromatic copolyamide consisting of the unit A represented by the prescribed formula I and the unit B represented by the formula II, by the coating rubber which is made by compounding resorcin in 2.4-4.5wt. parts and silica in 2-10wt. parts into 100wt. parts of the rubber composition consisting of natural rubber and the blend rubber of natural rubber and isoprene rubber and whose 100% modulus after vulcanization is set to 35-50kg/cm . With such constitution, durability can be improved, and weight can be reduced.
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公开(公告)号：JPS61241203A
公开(公告)日：1986-10-27
申请号：JP8026885
申请日：1985-04-17
Applicant: BRIDGESTONE CORP
Inventor： TANIGUCHI MOTOAKI , TAKAHASHI MASANOBU , YAMADA SHIGEKI , KATO KENSHIRO , ENDO KAZUYUKI
Abstract: PURPOSE:To relax the compressive stress of a crown shoulder section in the cross-sectional direction by forming a stress relaxing groove between the respective ground contact ends under the normal operating load in a crown section and under the larger load than the normal operating load just by a specific rate. CONSTITUTION:At least two circumferential belt layers in are arranged the crown section of a tire 10 and the maximum width of these belt layers is set to the width of approximately 100-140% of the ground width under the normal operating conditions of the crown section. For example, the tire is provided with a carcass layer 11 made of cords arranged at a right angle with the circumferential direction and the belt structure 12 containing a number of circumferential belt layers made of cords arranged almost inparallel to the circumferential direction and a number of circumferential grooves 13 are formed on the ground contact surface of the crown section. In this case, a stress relaxing groove 16 stretching in the circumferential direction is formed between a ground contact end 14 under the normal operating load of the crown section and a ground contact end 15 under the load of approximately 150% of the normal operating load.
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公开(公告)号：JPS61232905A
公开(公告)日：1986-10-17
申请号：JP7237385
申请日：1985-04-05
Applicant: BRIDGESTONE CORP
Inventor： YOSHIMURA SHINYA , KATO KENSHIRO , TANIGUCHI MOTOAKI , TAKAHASHI MASANOBU , YAMADA SHIGEKI , ENDO KAZUYUKI
Abstract: PURPOSE:To enhance the durability of bead section of a heavy duty pneumatic tire for air-craft, etc., by covering the fold-back end part of a carcass layer with two rubber cover layers having different elastic moduli which are lower in the inner one than in the outer one. CONSTITUTION:The fold-back part (a) of a carcass layer 1 made of aromatic polyamide cords 2 and a coating rubber 3 is covered with two layers of a first covering rubber 5 and a second covering rubber 6. The elastic modulus of the first covering rubber 5 is set at a value of 50 to 80% of that of the second covering rubber 6. Further, the second covering rubber 6 is arranged such that it completely wraps the outside of the first covering rubber 5. With this arrangement, the first covering rubber 5 serves as a shock damper for remarkably reducing the shear and deformation of the part between the carcass layer 1 and the covering rubber 5 as well as the boundary surface of fold-back end of the carcass layer, and the second covering rubber 6 follows up the defomation of a reinforcing layer on the carcass layer so that it serves as a reinforcing member for the carcass layer 1. Thus, if is possible to aim at enhancing the durability of bead section of a heavy duty pneumatic tire.
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公开(公告)号：JPS6128522B2
公开(公告)日：1986-07-01
申请号：JP15801382
申请日：1982-09-13
Applicant: BRIDGESTONE CORP
Inventor： TOGASHI MINORU , KATO KENSHIRO
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