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Truck tire

A tire and bead technology, applied to tire parts, bead, transportation and packaging, etc., can solve the problems of insufficient improvement of tire durability, and achieve the effects of restraining wear, restraining cord end loosening and restraining friction

Inactive Publication Date: 2012-05-23
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, if such a protective layer is formed, it cannot be said that the effect of suppressing wear is sufficient even in the case of continuous use under the above-mentioned high internal pressure and high load conditions, so that the improvement of the durability of the tire becomes insufficient, so further improvements are desired. improve

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0065] Based on the specifications in Table 1, the trial production has figure 1 The basic construction of the truck tire (size 11.00R20), and the wear resistance and general bead durability performance of each test tire were tested. Except for the specifications described in Table 1, all are the same specifications.

[0066]

[0067] ·High elastic apex part----complex elastic modulus E*1=50Mpa,

[0068] ·Low elastic apex part----complex elastic modulus E*2=4.0Mpa,

[0069] The radial height of the high elastic apex from the bead baseline BL--90mm,

[0070] The radial height of the low elastic apex from the bead baseline BL--120mm,

[0071]

[0072] ·Cord---3+8+13 / 0.23

[0073] ·The number of embedded cords----26 / 5cm (measured under the bead core)

[0074] ·The radial height Pc of the outer end of the cord return part---72mm

[0075]

[0076] ·Bead wire---φ1.55mm (after glueing )

[0077] ·Construction---8+9+10+11+12+11+10+9+8

[0078]

[0079] ·Cord---3+8 / 0...

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Abstract

The truck tire of the invention allows the endurance of an ordianry tire not to be damaged and helps to improve the wearing resistance. A tire bead is provided with a first tire bead reinforcing cord layer, a second tire bead reinforcing cord layer and an anti-wearing rubber layer. The first tire bead reinforcing cord layer is U-shaped for connecting an internal portion and an external portion via a bottom portion, wherein the internal portion is arranged along the internal side of the cord main body of a tire body, and the external portion is arranged along the external side of the cord returning portion of the tire body. From an internal end clamped between the internal portion and the cord main body, the second tire bead reinforcing cord layer extends toward an radial external side beyond the internal portion along the cord main body. The anti-wearing rubber layer comprises a rubber sheet which is 0.5-1.5mm in thickness, has a complex modulus of 6.0-10.0MPa, and is arranged between a tire body cord and a tire bead core along the tire body cord. The difference between the height of the external end of the second tire bead reinforcing cord layer and the height of the external end of the cord returning portion is 5-25mm. The difference between the height of the external end of the internal portion and the height of the internal end of the second tire bead reinforcing cord layer is 10-40mm.

Description

technical field [0001] The present invention relates to a heavy-duty tire that improves durability by preventing wear of carcass cords and bead cores. Background technique [0002] like Figure 4 As shown, in truck tires for trucks, passenger cars, etc., as the bead core a, a tire with a polygonal cross-section, usually a hexagonal cross-section, in which a steel bead wire is wound in multiple rows and layers is used. Ring core. [0003] On the other hand, the carcass ply b constituting the skeleton of the tire is usually locked by folding back both ends thereof around the bead core a. However, since the above truck tire is used under severe conditions of high internal pressure and high load, the deformation amount of the bead portion is large, and a large tension is applied to the carcass cord. As a result, so-called abrasion is generated in which the carcass cord is strongly rubbed with the corner portion e of the bead core a. In addition, when the wear caused by the we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/00B60C15/06
Inventor 芝野圭三李庆茂
Owner SUMITOMO RUBBER IND LTD
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