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Tire

A tire and tire crown technology, applied in road tires, tire parts, tire treads/tread patterns, etc., can solve problems such as difficulty in adjusting rolling resistance and wet performance, and achieve rolling resistance and ensure wet conditions. performance effect

Pending Publication Date: 2022-07-01
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Difficulty in adjusting the balance of rolling resistance and wet performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] Pneumatic tires for passenger cars (tire size = 205 / 55R16) were obtained with figure 1 The basic structure shown has the specifications shown in Table 1 below.

[0143] used with a crown layer, an intermediate layer and a base layer, with image 3 Tread of the composition shown. The loss tangent LTc at 30° C. of the crown layer was 0.27. The loss tangent LTm at 30° C. of the intermediate layer was 0.12. The loss tangent LTb at 30° C. of the base layer was 0.10.

[0144] The difference between the axial width WC of the crown layer and the width WT of the tread (WC-WT) was 0 mm. The difference (WB-WT) between the axial width WB of the base layer and the width WT of the tread was 0 mm. The difference between the axial width WM of the intermediate layer and the axial width WB of the base layer (WM-WB) was 10 mm.

[0145]In the shoulder land portion, the ratio Rg of the thickness Tg of the crown layer on the shoulder circumferential groove side to the effective groove ...

Embodiment 2

[0149] A tire of Example 2 was obtained in the same manner as in Example 1, except that the ratio Re and the difference (WC-WT) were as shown in Table 1 below.

Embodiment 3

[0151] A tire of Example 3 was obtained in the same manner as in Example 1 except that the ratio RM was as shown in Table 1 below.

[0152] [Rolling Resistance Coefficient (RRC)]

[0153] Using a rolling resistance tester, the sample tire was driven on a drum at a speed of 80 km / h under the following conditions, and the rolling resistance coefficient (RRC) at that time was measured. The results are shown in Table 1 below using an index of 100 in Comparative Example 1. The smaller the value, the lower the rolling resistance of the tire. Rim: 16×6.5J Internal pressure: 210kPa Longitudinal load: 4.82kN

[0154] [Wet performance of new tires (WET)]

[0155] A new sample tire was assembled on a rim (size = 16 x 6.5 J), filled with air, and the internal pressure of the tire was adjusted to 230 kPa. The tires were mounted on a test vehicle (passenger car). The test vehicle was driven on a test route on a wet road surface (water film thickness=1.4 mm). The test vehicle was brake...

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Abstract

The invention provides a tire (2) capable of ensuring required wet performance and reducing rolling resistance. The shape index of the reference ground plane of the tire (2) is more than 1.20 and less than 1.50. A tread (4) of this tire (2) has a crown layer (38), an intermediate layer (40) having a loss tangent at 30 DEG C lower than that of the crown layer (38) at 30 DEG C, and a base layer (42) having a loss tangent at 30 DEG C lower than that of the intermediate layer (40) at 30 DEG C. In the radial direction, the intermediate layer (40) is located on the outside of the base layer (42), and the crown layer (38) is located on the outside of the intermediate layer (40). In the shoulder land portion (28s) of the tread (4), the thickness (Tm) of the crown layer (38) at the axial width center (Pm) is thinner than the thickness (Tg) of the crown layer (38) on the shoulder circumferential groove (26s) side.

Description

technical field [0001] The present invention relates to a tire. Background technique [0002] When a low heat build-up rubber is used for the tread, a tire with low rolling resistance can be obtained. The grip of the low-heat-generating rubber is inferior to that of the heat-generating rubber that can exhibit high grip. Therefore, when a rubber with low heat build-up properties is used for a tread, for example, braking performance on a wet road surface (hereinafter also referred to as wet performance) is lowered. It is difficult to balance rolling resistance and wet performance well. Various studies have been conducted in order to reduce rolling resistance and improve wet performance (for example, the following Patent Document 1). [0003] 【Existing technical documents】 [0004] Patent Literature [0005] [Patent Document 1] Japanese Patent Laid-Open No. 2018-2008 SUMMARY OF THE INVENTION [0006] The problem to be solved by the invention [0007] From the viewpoint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/00
CPCB60C11/005B60C2011/0025B60C2200/04B60C2011/0033B60C11/0332B60C2011/0355B60C2011/0344
Inventor 宇野弘基
Owner SUMITOMO RUBBER IND LTD
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