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Pneumatic tire

A technology of pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, rolling resistance optimization, etc., can solve problems such as partial wear, poor rolling resistance, etc. The effect of suppressing uneven wear

Active Publication Date: 2014-12-17
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 1, since the central region is made of soft rubber, there is a disadvantage that uneven wear tends to occur. In Patent Document 2, rubber emphasizing rolling resistance is arranged in the center portion, and rubber emphasizing wetness is arranged in the shoulder portion. Grippy rubber has the disadvantage of poor rolling resistance, and any proposal is insufficient as a countermeasure for both rolling resistance and wet grip, and further improvement is required

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0050] The tire size is 195 / 65R15, and the tire structure is figure 1 A conventional tire (conventional example) composed of a compound of a medium structure and a compound of the tread cap with a low tan δ at 60°C with emphasis on rolling resistance, and the arrangement of the compound of the tread cap, between the tread and both sides The tires of the present invention (Examples 1 to 4) and comparative tires (Comparative Examples 1 to 5) with different physical properties, presence or absence of circumferential fine grooves, and specifications of the compound disposed on each shoulder portion are as shown in Table 1. In addition, in each tire, all specifications except the specification of Table 1 are the same.

[0051] For these 10 types of tires, the rolling resistance, wet grip performance and partial wear performance were evaluated by the following methods, and the results are collectively described in Table 1 with an index of 100 for conventional tires. Indicates that ...

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Abstract

The present invention provides a pneumatic tire which has both rolling resistance and wet grip performance while suppressing the occurrence of uneven wear. This pneumatic tire has a configuration in which cap rubber (10) is divided into a center part (10c) that extends across a tire equator line (CL) and shoulder parts (10s, 10s) located on both sides thereof, a compound having a higher tandelta at 0 DEG C compared to the shoulder part (10s) and focusing on wet grip performance is disposed in the center part (10c), a compound having a lower tandelta at 60 DEG C compared to the center part (10c) and focusing on rolling resistance is disposed in both the shoulder parts (10s, 10s), and circumferential fine grooves (11, 11) are formed on the respective shoulder sides of outermost main grooves (9a, 9z) in both the shoulder parts (10s, 10s).

Description

technical field [0001] The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire capable of suppressing the occurrence of uneven wear in which compounds having mutually different physical properties are disposed in the central region of the tread portion and two shoulder regions, while maintaining rolling resistance and wet-grip pneumatic tires. Background technique [0002] In general, as a method for reducing rolling resistance of tires, a method of reducing viscous loss in the cap portion of the tread by using a rubber with a low tan δ at 60° C. where rolling resistance is important is widely used as the cap rubber constituting the tread portion. However, in such tires, there is a problem that the grip performance on wet road surfaces is degraded, and in recent years, countermeasures for improving wet grip performance have been strongly demanded. [0003] On the other hand, as a measure for improving the wet grip performance of tires, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/00
CPCB60C11/0058B60C11/0309B60C2011/0025B60C2011/0348B60C2011/0351Y02T10/86B60C11/0008B60C11/03
Inventor 清水荣星栗山正俊佐藤正树
Owner YOKOHAMA RUBBER CO LTD
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