Pneumatic tire

A technology of pneumatic tires and tires, which is applied in the direction of off-road vehicle tires, tire parts, tire tread/tread pattern, etc., to achieve high off-road driving performance and reduce pattern noise

Inactive Publication Date: 2013-11-20
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this pneumatic tire retains the conventional pattern in the shoulder region, and there is still room for improvement.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0040] Assuming that the common tire size is 205R16C 110 / 108S, the amount of misalignment M between the outer block and the inner block in the shoulder area is set as shown in Table 1 (the ratio to the pitch length L of the transverse groove, the unit is %), manufactured separately figure 1 Invention tires 1 to 4 (Examples 1 to 4) and Comparative tires 1 and 2 (Comparative examples 1 and 2) having the structures shown, and Comparative tire 3 having no fine grooves in the inventive tire 2 (Comparative example 3 ), and a conventional tire (conventional example) in which the misalignment M between the outer block and the inner block in the shoulder region of Comparative Tire 3 was 0. In addition, in the tire 2 of the present invention, the grooves are provided with Figure 3A , 3B Invention tire 5 (Example 5) of the underridge shown.

[0041] In the tires 1 to 5 of the present invention and the comparative tires 1 and 2, the narrow grooves had a width of 3 mm and a depth of 5 ...

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Abstract

Provided is a pneumatic tire capable of achieving a reduction in pattern noise without sacrificing off-road performance. In the tire, circumferential main grooves (3) are formed respectively in shoulder sections (1S) of a tread area (1) so as to extend in a tire-circumferential direction (T); lateral grooves (8) are formed in the shoulder sections (1S) so as to extend outwards in a tire-width direction from the circumferential main grooves (3) and to be arranged at a predetermined pitch in the tire-circumferential direction (T); and blocks (9) are formed in the shoulder sections (1S) by the circumferential main grooves (3) and the lateral grooves (8). The pneumatic tire includes fine grooves (10) each extending so as to connect each adjacent two of the lateral grooves (8) in the tire-circumferential direction (T), each fine groove (10) dividing the corresponding block (9) into an inner block (9A) and an outer block (9B). The outer block (9B) is offset with respect to the inner block (9A) in the tire-circumferential direction (T) by an amount ranging from 15% to 30% of the pitch length (L) at which the lateral grooves (8) are arranged.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable for off-road running, and more specifically, to a pneumatic tire capable of reducing pattern noise while maintaining off-road running performance. Background technique [0002] Pneumatic tires mounted on four-wheel drive vehicles such as pickup trucks are required to have good off-road performance such as mud and snow performance. In such a pneumatic tire, lateral grooves extending in the tire width direction are arranged at predetermined intervals (pitch) in the tire circumferential direction in order to exert off-road running performance, but the impact caused by the blocks divided by the lateral grooves ( impact) sound is high, which is the main reason for deteriorating noise performance, especially pattern noise. [0003] Therefore, the present applicant has proposed a pneumatic tire (for example, refer to Patent Document 1), in which: by arranging grooves and blocks in the central area of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/12B60C11/03
CPCB60C11/1263B60C11/1369B60C2011/0348B60C2200/14B60C2011/0355B60C11/0306B60C2011/0353
Inventor 永吉胜智
Owner THE YOKOHAMA RUBBER CO LTD
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