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High capacity tire

A technology for tires and treads, which is applied to tire parts, tire treads/tread patterns, transportation and packaging, etc. It can solve the problems of sidewall rubber components that cannot be shared, low production efficiency, and side molds that cannot be used universally. Achieve the effects of suppressing cracks, improving rigidity, and suppressing tire shoulder shedding and wear

Active Publication Date: 2010-06-09
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the former case, in addition to the increase in material cost due to the increase in the anti-aging agent, when manufacturing tires t1 and t2, since the rubber composition of the sidewall rubber cannot be shared, there is a problem that the production efficiency is low.
When the latter manufactures tires t1 and t2, in addition to the tread mold for tread molding in the vulcanization mold, it is also necessary to change the side mold for sidewall molding, etc. The side molds cannot be used universally, resulting in increased mold costs and low production efficiency such problem

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0059] by figure 2 The tread pattern shown is a basic pattern, and a truck tire (TL295 / 75R22.5) in which grooves 16 were formed on the tread edge Te was trial-produced using the specifications shown in Table 1. Then each test tire was tested for crack resistance and partial wear resistance, and the results were compared. For each tire, the opening shape J1 of the groove 16 on the tread surface S and the cross-sectional shape parallel to the tread surface S are both trapezoidal, and the angle α of the side j1b (or side portion 18) relative to the tire axial Both are 50°. And each surface part 17-19 intersects by the arc part of curvature radius 4mm. In addition, the symbol LT in the table indicates the tire outer peripheral length (3235mm) on the tread contact point Te, the symbol WT indicates the tread contact width (212mm), and the symbol HT indicates the tire cross-sectional height (229mm), and each tire is fixed.

[0060] (1) Crack resistance:

[0061] Install the test...

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Abstract

The invention provides a high capacity tire capable of increasing crack resistance and eccentric wear resistance. A tire surface (2) is divided into a plurality of circumferential land units (11) by vertical main grooves (10) and the circumferential land unit (11o) arranged at the position most closed to the tire surface grounding end (Te) is formed to be substantially tire shoulder reinforcementrib (15) continuously extending towards the circumferential direction. A plurality of concave grooves (16) are arranged in interval along the circumferential direction on the tire surface grounding end. The circumferential concave groove length (Lh) of the concave groove (16) on the tire surface (S) is 0.003-0.01 time of the cirumferential length (LT) of the upper tire at the position of the tiresurface grounding end (Te) and the axial concave groove width (Wh) on the tire surface (S) is 0.03-0.02 time of the tire surface grounding width (WT) and the groove depth (Hh) from the tire surface grounding end of the concave groove is 0.08-0.15 time of the tire section height (HT).

Description

technical field [0001] The present invention relates to a truck tire having improved crack resistance by reducing deformation of a shoulder pad rubber portion in a tire provided with a tread pattern having shoulder ribs extending along the tread contact end. Background technique [0002] Tires mounted on the drive shaft side of heavy-duty vehicles such as trucks and buses are required to have high traction performance. Therefore, it is desired to form blocks in which a plurality of circumferential land portions divided by longitudinal main grooves extending in the tire circumferential direction form block rows on the tread portion of the tire on the drive shaft side. [0003] On the other hand, the load on the tires on the side of the drive shaft changes greatly when the so-called empty vehicle is not loaded with cargo, and is reduced to about 40% of the load at the time of maximum loading. Therefore, when the vehicle is empty, the ground contact pressure of the outer circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/13B60C11/01
Inventor 芝野圭三
Owner SUMITOMO RUBBER IND LTD