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Pneumatic tires

A technology for pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, transportation and packaging, etc. It can solve the problems of reduced area, poor wear resistance, and reduced rigidity of the tread portion, and achieves lateral Effects of increased partial stiffness, improved wear resistance, and improved rigidity

Active Publication Date: 2017-08-08
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the lateral groove is provided in the central land portion, the area of ​​the central land portion is reduced and the rigidity of the tread portion is reduced, thereby deteriorating the wear resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0059] Prototype has figure 1 The tread pattern is based on the pneumatic tires for light trucks with a size of 185 / 65R15 based on the specifications in Table 1, and the test is based on the wear resistance and wet road performance of the actual vehicle. The evaluation method is as follows.

[0060]

[0061] The test tire mounted on the rim of 15×5.0J was installed on the front wheel of a 2-D 2-ton loading vehicle (nuclear load) under the condition of an internal pressure of 600kPa, and the amount of wear after driving 8000km was measured to confirm the general situation of tire shoulder wear. The results are represented by an index with Example 5 being 100, and the larger the numerical value, the better the wear resistance.

[0062]

[0063] The above-mentioned vehicle was transported on a wet asphalt road surface having a water film with a thickness of 5 mm, and the driver's senses were used to evaluate characteristics such as rigidity and grip when cornering at a speed...

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PUM

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Abstract

The invention provides an aerated tyre which has a wear-resistant property and can be used on a wet road. The tread part (2) comprises a central main groove (3) which continuously extends along the circumferential direction of the tyre; a pair of tyre shoulder main grooves (4) which are arranged on the two sides of the central main groove (3) and continuously extends along the circumferential direction of the tyre; a pair of central land parts (5), which are arranged between each tyre shoulder main groove (4) and the central main groove (3); and a pair of tyre shoulder land parts (7), which are arranged between each tyre shoulder main groove (4) and a tread landing end (Te). The central land parts have a plurality of central horizontal grooves (8) that communicate the central main groove and the tyre shoulder main grooves (4) and are axially inclined relative to the tyre and a central patterned block (50), which is roughly in a rhomboid shape. The length ratio (La / Lb) of the length (La) of the central patterned block in the circumferential direction to the length (Lb) of the central patterned block in the axial direction is 0.8 to 1.1. The tyre shoulder land parts (7) are composed of ribs that continuously extend in the circumferential direction of the tyre.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of achieving both wear resistance and wet road performance, especially a pneumatic tire suitable for light trucks. Background technique [0002] In order to improve the wear resistance of tires for light trucks, it has been proposed to increase the ground contact area of ​​the tires. For example, if the groove width of the main groove extending in the tire circumferential direction on the tread portion is set to be narrow, the area of ​​the land portion increases, thereby increasing the actual ground contact area of ​​the tire. However, when the groove width of the main groove is too small, the wet performance of the tire decreases because the drainage performance of the tread portion decreases. [0003] In order to improve the wet performance without increasing the groove width of the main grooves, for example, it is effective to add lateral grooves connecting the main grooves to the land port...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/04
CPCB60C11/125B60C2011/0344
Inventor 塚本公一
Owner SUMITOMO RUBBER IND LTD
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