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Pneumatic tires

A pneumatic tire, tire circumferential technology, applied in tire parts, tire tread/tread pattern, vehicle parts, etc., to relieve stress concentration, take into account snow performance and low wear performance, and improve wear resistance.

Active Publication Date: 2018-12-28
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, just by adjusting the shape, groove width, arrangement, etc. of the transverse grooves, it is not necessarily possible to achieve a high degree of both snow performance and wear resistance, and further improvement is required.

Method used

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  • Pneumatic tires
  • Pneumatic tires
  • Pneumatic tires

Examples

Experimental program
Comparison scheme
Effect test

example

[0056] When the tire size is 215 / 60R16, with figure 1 The reinforcement structure exemplified in and except for the composite groove (and the circumferential auxiliary groove) are figure 2 In the tire with the tread pattern as the base tone, the structure of the compound groove, the relationship between the inclination direction of the compound groove at the central land portion and the compound groove at the middle land portion, and the groove width of the compound groove were set as shown in Table 1. Ratio (ratio Wa / Wb, ratio Wb / Ws), groove length ratio (ratio La / Lr, ratio Lb / Lr, ratio Ls / Lr), presence or absence of circumferential narrow grooves, conventional example 1 and comparison of circumferential narrow groove width Examples 1-2, Examples 1-11 These 14 kinds of pneumatic tires.

[0057] In these 14 kinds of pneumatic tires, except for Conventional Example 1, Comparative Examples 1-2, and Example 4, the shape of the composite groove is commonly figure 2 the shape s...

example 2

[0059] Example 2 is an example in which the structure of the composite tank is different in the center land portion and the middle land portion. In this example, the horizontal grooves of the composite groove formed in the central land portion include the wide portion and the narrow portion, but the horizontal grooves of the composite groove formed in the middle land portion are composed of only the wide portion. In Table 1, the dimensions of the composite grooves are collectively described as "the value of the composite grooves formed in the central land portion / the value of the composite grooves formed in the middle land portion" in each column regarding the dimensions of the composite grooves.

[0060] It should be noted that, in each example, the groove width of the sipe is 1.0 mm. In addition, the width of the land portion where the composite groove is formed is 24 mm in common.

[0061] About these 14 kinds of pneumatic tires, on-snow performance and abrasion resistance...

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Abstract

The present invention provides a pneumatic tire capable of improving on-snow performance and wear resistance. The pneumatic tire of the present invention is divided into a row of central lands (21), two rows of middle lands (22) and two rows of outer lands (23) by four main grooves. ), form a plurality of composite grooves (30) at intervals in the circumferential direction of the tire, and the composite grooves (30) include one end communicating with the main groove (10) on one side and the other end in the ring bank The transverse groove (31) terminated in (20) and the sipe (32) of the main groove (10) extending from the other end of the transverse groove (31) to the other side, with respect to the main groove (31) The opening directions of the grooves (10) are arranged alternately and reversely along the tire circumferential direction, and the composite grooves (30) are formed in each transverse groove (31) to open to the main groove (10) and extend with a fixed groove width. A wide portion (31a) and a narrow portion (31b) located between the wide portion (31a) and the sipe (32) and extending with a constant groove width narrower than the wide portion (31a).

Description

technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire capable of improving on-snow performance and wear resistance. Background technique [0002] In all-season pneumatic tires that are used throughout the year and are assumed to be used on dry roads, wet roads, and snowy roads, in addition to the usual dry performance and wet performance, snow performance (for example, performance on snowy roads) is also required. driving stability). In addition, since it can be used on various road surfaces as described above, wear resistance is also required for long-term use. [0003] As a method of improving on-snow performance, for example, it is conceivable to provide a large number of lateral grooves extending in the tire width direction to secure edge components. However, when many transverse grooves are provided, the rigidity of the land portion decreases, making it difficult to obtain excellent wear resistance. There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/03B60C11/12
CPCB60C2011/1209B60C2011/0372B60C11/0306B60C11/1236B60C2011/0365B60C11/0304B60C2011/0353
Inventor 山川贵弘
Owner THE YOKOHAMA RUBBER CO LTD