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Tire

A tire and tire circumferential technology, applied to tire parts, tire tread/tread pattern, vehicle parts, etc., can solve the problem of reduced drainage of the crown main groove and achieve the effect of maintaining wet road performance

Pending Publication Date: 2020-08-04
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when the volume of the raised portion is large, the drainage performance of the crown main groove tends to decrease.
Therefore, there is room for further improvement in improving stone inclusion resistance without impairing wet road performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] Based on the specifications in Table 1, a trial production with figure 2 or Figure 4 Pneumatic tire for trucks with the raised portion shown and size 315 / 80R22.5. As a comparative example, such as Figure 5 As shown, a tire in which a raised portion b excluding narrow grooves and cavities is formed on the main groove a was trial-manufactured. The tire of the comparative example is substantially the same as the tire of the example except for the above structure. The wet road performance and stone inclusion resistance performance of each test tire were tested. Common specifications and test methods for test tires are as follows.

[0057] Mounting rim: 22.5×8.25

[0058] Tire internal pressure: 720kPa

[0059] Test vehicle: 10-ton truck, loaded with 50% of the standard load in front of the box

[0060] Tire installation position: all wheels

[0061]

[0062] The above-mentioned test vehicle was used to travel 65±2km on a wet road surface with a water depth of 0...

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PUM

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Abstract

Provided is a tire that is capable of improving anti-stone trapping performance without impairing wet performance. In the tire, a groove is formed in a tread portion 2. The groove 3 has a groove bottom 4b. At least one projection portion 10 projecting in a tire radial direction is formed on the groove bottom 4b. The projection portion 10 has side surfaces 12 extending outward in the tire radial direction from the groove bottom 4b, and an outer surface 15 which is contiguous with the side surfaces 12 and which faces outward in the tire radial direction. The projection portion 10 has therein a thin groove portion 18 opened in the outer surface 15, and a hollow portion 20 which is contiguous with an inner side in the tire radial direction of the thin groove portion 18 and which has a larger width than the thin groove portion 18.

Description

technical field [0001] The present invention relates to a tire, and in particular relates to a tire capable of preventing stone inclusion in a groove. Background technique [0002] Patent Document 1 below proposes a tire having a crown main groove provided with a raised portion for preventing stone trapping. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2018-134915 [0004] The larger the volume of the raised portion is, the more excellent the stone inclusion resistance performance can be exhibited. On the other hand, when the volume of the raised portion is large, the drainage performance of the crown main groove tends to decrease. Therefore, there is room for further improvement in improving stone inclusion resistance without impairing wet road performance. Contents of the invention [0005] The present invention has been made in view of the above circumstances, and a main object thereof is to provide a tire capable of improving stone trapping resistance w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/13B60C11/04
CPCB60C11/1353B60C11/047B60C2011/1361B60C11/0323B60C11/125
Inventor 细田恭弘
Owner SUMITOMO RUBBER IND LTD
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