B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
152/85.2
B60C 9/06 (2006.01) B60C 9/14 (2006.01)
Patent
CA 1130710
ABSTRACT A thick-cord lightweight tire body having an improved fatigue life comprises a bias-structured carcass composed of rubberized plies each including thick organic fiber cords having a cord diameter equal to or larger than nylon 1,890 d/2 and rubber interposed between the carcass plies and having a thickness corresponding to hm/ho -? 0.5 where hm is an average rubber gauge between the plies at a center position in the widthwise direction of the tire and ho is a diameter of the thick cord. The rubber is a rubber composition consisting essentially of 100 parts by weight of a rubber component and 50-70 parts by weight of carbon black, the rubber component being a mixture of 60-95 parts by weight of at least one rubber selected from the group consisting of natural rubber, synthetic polyisoprene rubber, polybutadiene rubber and styrene-butadiene copolymer rubber and 5-40 parts by weight of at least one liquid polymer selected from the group consisting of liquid polybutadiene, liquid polyisoprene and liquid styrene-butadiene copolymer and having a viscosity- average molecular weight of 3x104-10x104. The rubber compo- sition has a dynamic modulus of elasticity at 100°C under 2% elongation of not less than 6.0x107 dyne/cm , a dynamic loss angle tan .delta. of not more than 0.095 and a tensile strength of not less than 100 kg/cm2 as properties after vulcanization. The carcass is provided with an apex rubber for stiffening a turnup portion thereof wherein a ratio in the dynamic modulus of elasticity of the apex rubber to the rubber interposed between the plies is within a range of 0.9 to 1.3.
359478
Kawaguchi Yasuyosi
Shimotake Munetoshi
Yamamoto Fujio
Bridgestone Tire Company Limited
Swabey Ogilvy Renault
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