Pneumatic tire with reinforcement rubber layer
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsNaoya Amino, Katsunori Tanaka, Atsushi Tanno
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Abstract
A pneumatic tire allowed to increase steering stability and durability while reducing rolling resistance, wherein a reinforced rubber layer extending from a bead part along a side wall part is installed in the side wall part. A rubber composition forming the reinforced rubber layer has a loss of tangent (tan δ) measured at 60° C. of 0.01 to 0.25, a JIS-A hardness measured at 23° C. of 70 to 95, and a breaking elongation in a tension test measured at 23° C. of 200% or more.
Claims1
A pneumatic tire provided with a reinforcement rubber layer extending from a bead portion along a sidewall portion, inside the sidewall portion thereof, wherein:
- a rubber composition forming the entire reinforcement rubber layer has a loss tangent (tan δ) of 0.01 to 0.25 when measured at a temperature of 60° C., a JIS-A hardness of 70 to 95 when measured at a temperature of 23° C., and a breaking elongation not less than 200% when measured at a temperature of 23° C. in a tensile test,
- the reinforcement rubber layer extends from a bead core at the bead portion along the sidewall portion, and beyond a widest-width position of the tire, and reaches a shoulder portion of the tire,
- the rubber composition forming the reinforcement rubber layer is one formed in a manner that 20 to 120 weight parts of silica, and 0 to 60 weight parts of carbon black are mixed with 100 weight parts of rubber, and
- the total of the weight parts of silica and carbon black in the rubber composition is between 65 and 105.
Dependencies are inferred from the claim text.