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Pneumatic tire

A technology of pneumatic tires and tires, applied in tire parts, tire sidewalls, transportation and packaging, etc., can solve problems such as deterioration, small rubber thickness, cut resistance and cutting resistance, and maintain riding comfort and reduce rubber. volume, the effect of improving heat dissipation

Pending Publication Date: 2017-09-22
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the case of the above-mentioned tire, the rock performance can be improved, but the thickness of the rubber is small in the recesses between blocks, so there is a problem that cuts are easily generated due to collision with rocks, etc., and the cut resistance performance deteriorates.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0050] In order to confirm the effect of the present invention, a pneumatic tire (LT265×70R17) for a four-wheel drive vehicle having side protectors of the specifications in Table 1 was trial-manufactured, and rock performance, cutting resistance performance, heat storage performance, and ride comfort performance were tested. . All the test tires have substantially the same specifications except for the side bead.

[0051]

[0052] Under the conditions of rim (17×7.5) and internal pressure (100kPa), install each trial tire on all wheels of a four-wheel drive vehicle (2500cc), and test it on rocky roads including rocky mountains, etc. through the driver's senses The traction performance (rock performance) when running on a runway was evaluated. The results are represented by an index with Comparative Example 1 as 100. The larger the value, the better the rock performance.

[0053]

[0054] After running for about 50 km on the above-mentioned rocky road surface, the cuts ...

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Abstract

The present invention provides a pneumatic tire, which ensures the rock performance and improves the cutting resistance. A pneumatic tire 1 comprises a sidewall portion 3 provided with a side protector 9 protruding from a contour line S of the sidewall portion. The side protector 9 is composed of first protector blocks 11 arranged in the tire circumferential direction at intervals and second protector ribs 12 connecting therebetween. In a tire meridian section including each second protector rib 12, the second protector rib 12 has a triangular cross-sectional shape having an apex 13 at which the protruding height from the contour line S becomes maximum, and radially outer and inner oblique sides 14 and 15 extending radially outwardly and inwardly from the apex 13. Each of the radially outer and inner oblique sides 14 and 15 is a concave circular arc whose center is positioned outside the tire.

Description

technical field [0001] The present invention relates to a pneumatic tire having improved cutting resistance while ensuring traction performance on rocky terrain (rock performance). Background technique [0002] For example, a pneumatic tire mounted on a four-wheel drive vehicle or the like has the opportunity to run on a rocky road surface, so it is required to exhibit sufficient traction performance even on such a road surface (this performance is sometimes called "rock performance". ). In order to improve the performance of rocks, a tire is proposed in which block-shaped side protectors (side protectors) are provided on the sidewall portion with blocks protruding from the outer surface at intervals in the tire circumferential direction (see, for example, Patent No. Document 1.) [0003] However, in the case of the above-mentioned tire, rock performance can be improved, but the thickness of the rubber is small in the recesses between the blocks, so there is a problem that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C13/00B60C13/02
CPCB60C13/002B60C13/003B60C13/02
Inventor 佐竹圆
Owner SUMITOMO RUBBER IND LTD
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