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High-capacity tyre

A technology for tires and treads, applied to tire parts, tire treads/tread patterns, transportation and packaging, etc., can solve the problems of reducing the strength of strip-shaped parts, difficult implementation, and inability to exert a mitigation effect, etc., to achieve improved The effect of swimming performance

Inactive Publication Date: 2009-11-25
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relaxation effect cannot be exhibited for the above-mentioned lateral force fy, so the swimming performance cannot be improved.
Here, in the case where the narrow groove c and the narrow groove i are used together, since the strength of the strip-shaped portion d is excessively reduced, it is difficult to implement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] Prototype has figure 1 A heavy truck tire (size: 12R22.5) with the structure shown and the circumferential narrow grooves of the specifications in Table 1 were formed on the sidewall surface, and the swimming performance, uneven wear resistance and crack resistance of each trial tire were tested, and the mutual A comparison was made. All the tires have the same specifications except for the shape of the shoulder and the circumferential groove, the radius of curvature Rc of the tread is 680 mm, and the groove depth Hg1 of the shoulder groove is 17.5 mm.

[0050] The test method is as follows.

[0051] swimming performance:

[0052] Under the conditions of rim (8.25×22.5) and internal pressure (850KPa), the trial tire was installed on the full wheel of the vehicle (passenger car), and it was driven in an empty state on the rutted road surface for swimming test. Behaviors (swimming performance) such as going straight, entering, and leaving a rut were expressed by the s...

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Abstract

The invention provides a high-capacity tyre, capable of regularly improving the motility performance and uneven abrasion resistant performance. In the high-capacity tyre in the invention, circumferentially continuous and extending circumferential grooves (10) are arranged on a tyre sidewall surface (3Sa) of a tire lateral part (3) connected with a tread edge (Te) of a tread ( 2S) by a tire shoulder circular arc part (9). The circumferential groove (10) comprises: a groove body (12) extending from the opening part (11) to the axial inner side of the tyre, and an accessory part (13) with a extend-out part (14) going over a ditch side (12a) at the radial outer side of the groove body (12) and extending out toward the radial outer side. A radial external end (P) of the extend-out part (14) is located nearest to the radial outer side than the opening edge (11a) of the opening part (11), the curvature radius (Rs) of the tire shoulder circular arc part (9) is above 8mm.

Description

technical field [0001] The present invention relates to a heavy-duty tire with balanced improvement in swimming performance and uneven wear resistance. Background technique [0002] In a truck tire used under high internal pressure and high load conditions, the rigidity of the entire tread portion is increased by providing a multi-layered belt layer using metal cords in the tread portion. Therefore, when driving on a rutted road surface, if Figure 6 As shown in (A), since the tire shoulder a is subjected to a huge lateral force fy when leaving the rut, a so-called wandering phenomenon in which the steering wheel loses control occurs. [0003] Therefore, as shown in this figure, for example, it has been proposed to provide a thin groove c extending in the circumferential direction near the tread edge be of the tread b (for example, refer to Patent Document 1). Since the narrow groove c is deformed in a direction in which the groove width decreases against the lateral force ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/01B60C11/13
Inventor 高桥伸吾
Owner SUMITOMO RUBBER IND LTD
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