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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：JPS6056642B2
公开(公告)日：1985-12-11
申请号：JP2022281
申请日：1981-02-16
Applicant: BRIDGESTONE CORP
Inventor： TAKAHASHI MASANOBU
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