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Pneumatic tyre

A technology for pneumatic tires and tires, applied in tire parts, tire treads/tread patterns, transportation and packaging, etc. It can effectively ensure the drainage performance of the shoulder and land parts, and achieve the effects of improving handling stability, suppressing uneven wear, and improving drainage performance.

Active Publication Date: 2015-01-14
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the pneumatic tire disclosed in the aforementioned Patent Document 1, since the shoulder lateral grooves are terminated in the shoulder land portion, the drainage performance inside the shoulder land portion may not be sufficiently ensured.
In addition, since the expected rigidity distribution cannot be obtained in the shoulder land portion, it is difficult to further improve the steering stability and uneven wear resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0088] Based on the specifications in Table 1 to Table 4, prototypes with figure 2 The size of the basic pattern is 195 / 65R15 pneumatic tire, and it is installed on the rim of 15×6J, and it is installed on the all-wheel of the car with the displacement of 1800cc under the condition of the internal pressure of 230kPa, and the performance of uneven wear resistance , handling stability and wet road braking performance were tested. The test method is as follows.

[0089]

[0090] After each test tire ran 8000 km, the heel-toe wear of the middle land portion and the heel-toe wear of the shoulder land portion were measured. The result is an index of 100 for Comparative Example 1, and a larger value indicates better uneven wear resistance.

[0091]

[0092]The vehicle was driven by a driver on a test course on a dry asphalt road, and characteristics related to steering response, rigidity, and grip during cornering were evaluated based on the driver's senses. The result is an ...

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Abstract

The present invention provides a pneumatic tyre capable of suppressing reduction of drainage performance, improving operation stability and uneven wear resistant performance. The pneumatic tyre (1), at a tyre surface portion (2), has a pair of tyre shoulder main grooves (10) configured at an inner side of a tyre surface grounding end (Te) and extending continuously along a circumferential direction of the tyre, and a pair of tyre shoulder land portions (13) arranged at a tyre axial outer side of the tyre shoulder main grooves (10). The tyre shoulder land portions (13) are provided with: a plurality of tyre shoulder transverse grooves (31) extending towards the tyre axial inner side from the tyre surface grounding end (Te) and having inner ends (31i) forming ends in the tyre shoulder land portions (13); tyre shoulder auxiliary cut slots (34) communicated between the inner ends (31i) of the tyre shoulder transverse grooves (31) and the tyre shoulder main grooves (10); and tyre shoulder thin grooves (33) which are not communicated with the tyre shoulder auxiliary cut slots (34) between the adjacent tyre shoulder auxiliary cut slots (34) in the circumferential direction of the tyre and extend along the circumferential direction of the tyre.

Description

technical field [0001] The present invention relates to a pneumatic tire that suppresses reductions in handling stability and drainage performance and improves uneven wear resistance. Background technique [0002] The shoulder land portion located on the outermost side in the tire axial direction of the tread portion has a high contact pressure during cornering, which greatly affects the steering stability. [0003] Generally, in a tread pattern in which the shoulder land portion is composed of ribs extending continuously in the tire circumferential direction, the rigidity of the shoulder land portion can be sufficiently ensured to obtain excellent steering stability performance. However, the shoulder land portion composed of such a strip portion has insufficient drainage channels for water caught between the shoulder land portion and the road surface on a wet road surface, thereby degrading the drainage performance. [0004] Therefore, various studies have been made on a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/13B60C11/12B60C11/03B60C11/01
CPCB60C11/032
Inventor 荻原佐和
Owner SUMITOMO RUBBER IND LTD
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