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Tire

A tire and tire circumferential technology, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problems of poor wet performance, reduced drainage, and difficulty in improving balance, and achieve excellent performance. Noise performance, noise performance improvement, effect of suppressing air column resonance

Active Publication Date: 2018-05-29
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the groove volume of the main groove is reduced, there is a problem that the drainage performance is reduced and the wetland performance is deteriorated.
In this way, the noise performance has an inverse relationship with the wetland performance, and it is difficult to improve the above two performances in a balanced manner

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0074] Prototype has figure 1 Pneumatic tires with basic pattern and size 275 / 55R20. Each test tire was tested for wet performance and noise performance. The test method and common specifications are as follows.

[0075] Mounting rim: 20×9.0J

[0076] Test internal pressure: 250kPa

[0077] Test vehicle: a four-wheel drive vehicle with a displacement of 3700cc

[0078] The pitch number P1 of the crown main groove: the comparative example and the example are the same

[0079] The test method is described below.

[0080]

[0081] The test driver drove the test vehicle on which each test tire was mounted on a test road on a wet asphalt road with a water depth of 10 mm, and evaluated the running characteristics related to traction performance and braking performance at that time by the test driver's senses. The results are shown using a score with Comparative Example 1 as 100. The larger the numerical value, the better it is.

[0082]

[0083] The test driver used the ...

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PUM

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Abstract

A tire 1 includes a tread portion 2 being provided with a crown main groove 3 extending continuously in a zigzag manner in a tire circumferential direction and a shoulder main groove 4 extending continuously in a zigzag manner in the tire circumferential direction. The shoulder main groove is arranged outwardly of the crown main groove in a tire axial direction. The crown main groove has a numberof zigzag pitches in a range of from 0.21 to 0.32 times a number of zigzag pitches of the shoulder main groove.

Description

technical field [0001] The present invention relates to a tire that improves noise performance and wet performance in a balanced manner. Background technique [0002] Generally, the tread portion of a tire is provided with main grooves extending continuously in the tire circumferential direction in order to smoothly discharge water on the road surface to the rear in the tire rotation direction. However, during running on a dry road surface, the air flowing in the main groove generates standing waves, thereby generating air column resonance sound. This air column resonance sound is known as a main cause of noise generated by tires. In order to improve the noise performance of the tire, a main groove with a small groove volume has been proposed. [0003] However, when the groove volume of the main groove is reduced, there is a problem that the drainage property is lowered and the wetland performance is deteriorated. In this way, noise performance and wetland performance hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/04
CPCB60C11/032B60C11/04B60C2011/0358B60C11/0306B60C11/0309B60C2011/0353B60C2011/0374B60C11/12B60C2011/0372B60C2011/0346B60C11/0302B60C11/1315
Inventor 西胁隆志
Owner SUMITOMO RUBBER IND LTD
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