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Pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve problems such as deterioration of operational stability, deterioration of noise performance, air column resonance, etc., to improve drainage performance. Effect

Inactive Publication Date: 2010-09-15
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that air column resonance is easily generated in such longitudinal grooves during running of the vehicle, and noise performance is deteriorated
In addition, there is a problem that the rigidity of the tread portion is lowered, and the handling stability is deteriorated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0079] Samples of radial tires for passenger cars having a size of 195 / 65R15 were produced under the specifications shown in Table 1, and each tire was tested for drainage performance, ride comfort, and noise performance. The tires of the examples have figure 1 Tread pattern shown. Such as Figure 6 As shown, in the tire of Comparative Example 1, the middle land portion was not provided with fine grooves. In the tire of Comparative Example 2, the middle land portion was not provided with the connection groove shown. In the tire of Comparative Example 3, both end portions of the connection grooves are connected to the axially inner end portions of the shown intermediate inclined grooves. In Comparative Example 2, the number of intermediate inclined grooves arranged in the tire circumferential direction was increased so that the land ratio became the same as that of the other Examples.

[0080] The common technical specifications are as follows:

[0081] Tread contact width...

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PUM

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Abstract

A pneumatic tire having good water discharge and anti-noise characteristics. The pneumatic tire has a tread (2) having a center longitudinal groove (3a), shoulder longitudinal grooves (3b) extending on both sides of the center longitudinal groove (3a), and intermediate land sections (4a) divided by the center longitudinal groove (3a) and the shoulder longitudinal grooves (3b). Each intermediate land section (4a) includes narrow grooves (5) extending from positions spaced to the inner side in the tire's axial direction from a shoulder longitudinal groove (3b), intermediate inclined grooves (6)each inclinedly extending from a narrow groove (5) toward the center longitudinal groove (3a) and terminating without being connected to the center longitudinal groove (3a), and connection grooves (7) interconnecting intermediate inclined grooves (6) adjacent each other in the tire's circumferential direction. The connection grooves (7) are inclined relative to the tire's circumferential direction in the same direction as the intermediate inclined grooves (6) and at a smaller angle than the intermediate inclined grooves (6).

Description

technical field [0001] The present invention relates to a pneumatic tire capable of satisfying noise performance and handling stability at high levels while maintaining drainage performance and ride comfort. Background technique [0002] Generally, in order to improve the water drainage performance of a tire, it is necessary to increase the volume of the longitudinal grooves provided on the tread portion of the tire and extending in the circumferential direction of the tire. However, there is a problem that air column resonance is easily generated in such longitudinal grooves during running of the vehicle, and noise performance is degraded. In addition, there are problems in that the rigidity of the tread portion is lowered, and the handling stability is deteriorated. [0003] The present applicant has proposed a pneumatic tire in which longitudinal grooves extending linearly in the circumferential direction of the tire are combined with inclined grooves inclined with respe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/04B60C11/01B60C11/13
CPCB60C11/1392B60C2011/0381B60C11/13B60C2011/0369B60C11/0302B60C11/032B60C2011/0374
Inventor 向井友幸
Owner SUMITOMO RUBBER IND LTD
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