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Tire

A tire and tire circumferential technology, applied to tire parts, tire tread/tread pattern, rolling resistance optimization, etc., can solve the problems of inability to drain water, poor turning performance on dry roads, and reduced rigidity of the outer tread pattern, etc. problems, to achieve the effect of high lateral rigidity and excellent cornering performance

Active Publication Date: 2019-12-20
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned first main groove and the above-mentioned second lateral groove have a problem that the water between the outer tread portion and the road surface cannot be sufficiently drained during wet driving.
On the other hand, when the main groove continuously extending in the tire circumferential direction is arranged on the outer tread portion, the pattern rigidity of the outer tread portion decreases, resulting in poor cornering performance on a dry road surface.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] Based on the specifications in Table 1, a trial production with figure 1 The basic tread pattern is a tire of size 205 / 55R16. As a comparative example, such as Figure 7 The pneumatic tire shown has a main groove b provided in the outer tread portion a, and a plurality of lateral grooves c extending from the main groove b toward the outer tread edge To and interrupted in the outer tread portion a. The wet road performance and the cornering performance on a dry road surface of each test tire were tested. Common specifications and test methods for each test tire are as follows.

[0082] Rims: 16×6.5J

[0083] Tire internal pressure: 230kPa

[0084]

[0085] Using a built-in drum tester, the generation speed of the slipping phenomenon when each test tire was run on a drum surface with a water depth of 5.0 mm under the following conditions was measured. The results are an index based on Comparative Example 1 as 100. The larger the numerical value, the higher the abov...

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Abstract

The tire provided by the present invention can ensure wet road performance and exhibit excellent cornering performance. The tire has a tread portion (2) that specifies a direction in which the tire ismounted. The tread portion (2) has an outer tread ground end (To), an inner tread ground end (Ti), and an outer tread portion (4) between the tire equator (C) and the outer tread ground end (To). Thetread portion (2) is provided with a first main groove (11) continuously extending in the tire circumferential direction between the tire equator (C) and the inner tread ground contact end (Ti), anda plurality of first transverse grooves (16) extending from the first main groove (11) to at least the outer tread ground contact end (To). The distance from the tire equator (C) to the groove centerline of the first main groove (11) in the axial direction of the tire is 0.20 times or less the half width of the tread. The outer tread portion (4) is not provided with a main groove extending continuously in the tire circumferential direction.

Description

technical field [0001] The present invention relates to tires, and specifically relates to tires suitable for high-speed travel. Background technique [0002] Patent Document 1 below proposes a tire for both road running and track running. In order to ensure wet road performance on roads, the tire has: a first main groove arranged between the tire equator and the ground contact end of the inner tread; The second horizontal groove. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2017-030604 [0004] However, the above-mentioned first main groove and the above-mentioned second lateral groove have a problem that water between the outer tread portion and the road surface cannot be sufficiently drained during wet driving. On the other hand, when the outer tread portion is provided with main grooves extending continuously in the tire circumferential direction, the pattern rigidity of the outer tread portion decreases, resulting in poor cornering performance on a dry r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/12
CPCB60C11/03B60C11/1236B60C2011/0339Y02T10/86
Inventor 小高和真
Owner SUMITOMO RUBBER IND LTD
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