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Steel cord for tire and pneumatic tire employing it

A technology of steel cords and cords, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire edges, etc., which can solve the problems of poor cord rubber permeability, cord strength deterioration, and stranded wire rust, etc. The effects of decreased cord strength, increased contact area, and decreased contact pressure

Inactive Publication Date: 2010-10-06
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in such a dense layer strand structure, the number of gaps between the strands in the sheath is small, so the rubber permeability inside the cord is poor
Therefore, moisture from the damaged part of the tire generated during tire operation causes rust in the strands, and there is a tendency for cord strength to deteriorate

Method used

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  • Steel cord for tire and pneumatic tire employing it
  • Steel cord for tire and pneumatic tire employing it
  • Steel cord for tire and pneumatic tire employing it

Examples

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Effect test

Embodiment

[0054] In order to confirm the effect of the present invention, a heavy-duty tire A (tire size: 11R22.5) was prepared, which was used as figure 1 Bead reinforcing cords of the structure shown and the specifications in Table 1; and heavy duty tire B (tire size: 11R22.5) using carcass cords with the specifications in Table 2, and tested for rubber permeability; run The occurrence of post rust; and the strength retention characteristics of bead reinforcing cords and carcass cords after running. The cord cross-sectional shapes of Comparative Examples 1A and 1B are shown in FIG. 6(A), and the cord cross-sectional shapes of Comparative Examples 2A and 2B are shown in FIG. 6(B).

[0055] (1) Rubber permeability:

[0056] The bead reinforcing cord and the carcass cord are separated from the tire in a state where the topping rubber is attached, as much rubber as possible is removed from the surface of the cord with the rubber, and then, the cord is disassembled. Each cord was observ...

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Abstract

Deterioration in strength of a cord due to traveling is suppressed by reducing mutual rubbing of the strands in a steel cord, and durability of a tire is enhanced by enhancing permeability of rubber. The steel cord comprises a cord body (19) of three layer twisted structure including a core (16) consisting of one core strand (f1), an inner sheath (17) consisting of N (2-5) inner sheath strands (f2) twisted at a pitch (Pi) around the core, and an outer sheath (18) consisting of M (6-11) outer sheath strands (f3) twisted at a pitch (Po) around the inner sheath (17). The strands (f1, f2, f3) have an identical diameter and the twisting direction of the sheaths (17, 18) is identical. The difference (|Ai-Ao|) of the twisting angle Ai of the inner sheath strand (f2) and the twisting angle Ao of the outer sheath strand (f3) is larger than 1 DEG and smaller than 3 DEG .

Description

technical field [0001] The present invention relates to a steel cord for tires suitable for a carcass cord and a bead reinforcing cord; and a pneumatic tire using the steel cord. Background technique [0002] In heavy-duty tires, steel cords are often used to form the carcass of the tire components and / or the bead reinforcement layer, which reinforces the bead portion to improve bead durability. As steel cords, in order to obtain higher cord tensile strength per cord diameter and excellent fatigue resistance, 3+9 and 1+6 double-layer strand structures, or 3+9+15 and 1 +6+12 Three-layer strand structure in which strands with the same diameter are arranged very closely or densely. [0003] However, in such a dense layer strand structure, the number of gaps between the strands in the sheath is small, so the rubber permeability inside the cord is poor. Therefore, moisture from the damaged portion of the tire generated during tire operation causes rust in the strands, and there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D07B1/06B60C9/00B60C15/06
CPCD07B2201/2059D07B2501/2046D07B2201/2023D07B2201/204D07B2201/2031B60C9/0007D07B2201/2097D07B1/0633D07B2201/2025D07B2201/2029Y10T152/10855Y10T152/10819D07B2801/12
Inventor 宫崎真一
Owner SUMITOMO RUBBER IND LTD
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