Tire reinforcing steel cord and tire
AssigneesTokusen Kogyo Co., Ltd., The Yokohama Rubber Co., Ltd.
InventorsNoritaka Morioka, Sinya Harikae
Life of this patent
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Abstract
A zero degree tire reinforcing steel cord is formed by twisting together four to seven individual wires having a wire diameter of 0.20 to 0.45 mm, wherein the steel cord has a substantially spiral or a substantially planar wavy deformation, has an elongation of 1.2% to 2.0% under a tensile load of 50 N and becomes substantially linear with its wavy deformation disappearing under a tensile load of 50 to 250 N. The steel cord stretches to a moderate extent so as to track expansion of the tire in the radial direction during the vulcanization process and thereafter restrains expansion of the tire in the radial direction during continued high speed rotation of the tire.
Claims10
A tire reinforcing steel cord having a 1×n structure formed by twisting together four to seven individual wires having a wire diameter of 0.20 to 0.45 mm, the steel cord being wound a plurality of times in the vicinity of opposite side edges of a belt section of a tire, wherein the steel cord has a substantially spiral or a substantially planar wavy deformation, has an elongation of 1.2% to 2.0% when applying a tensile load of 50 N in a tensile test according to JIS B 7721, and becomes substantially linear with the wavy deformation thereof disappearing under a tensile load in the range of 50 to 250 N.
A tire reinforced with steel cord formed by the following process:
- forming a reinforcing steel cord having a 1×n structure formed by twisting together four to seven individual wires having a wire diameter of 0.20 to 0.45 mm such that the steel cord has a substantially spiral or a substantially planar wavy deformation and an elongation of 1.2% to 2.0% when applying a tensile load of 50 N in a tensile test according to JIS B 7721;
- continuously winding the steel cord multiple times in a circumferential direction of a tire in the vicinity of opposite side edges of a belt section of a tire;
- and
- vulcanizing the tire such that the wavy deformation of the steel cord substantially disappears and the steel cord becomes substantially linear.
Dependencies are inferred from the claim text.