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Pneumatic tire

A pneumatic tire, tire circumferential technology, applied to tire parts, tire tread/tread pattern, vehicle parts, etc., can solve the problem of large change in the area of ​​the front-end wire groove on the ground, to suppress pattern noise, suppress pattern Noise generation, effect of pattern noise reduction

Active Publication Date: 2020-11-13
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the arrangement of the sipes provided on the tread portion, there is a problem that the variation in the groove area in the ground contact tip line becomes large, and pattern noise tends to occur.

Method used

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  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
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Effect test

Embodiment

[0041] With the tire size 225 / 50R18, the tires of Examples 1-6 were produced, and these tires were equipped with: a tread portion extending in the tire circumferential direction and forming a ring shape; a pair of sidewall portions arranged on both sides of the tread portion; and a The bead portion is disposed on the inner side in the tire radial direction of these sidewall portions, and four main grooves including a pair of inner main grooves and a pair of outer main grooves extending in the tire circumferential direction are provided on the tread portion, and are divided by these main grooves. Out of the central land portion, a pair of intermediate land portions located outside the central land portion, and a pair of shoulder land portions located outside the intermediate land portion, wherein the central land portion, the intermediate land portion, and the shoulder land portions are respectively A plurality of sipes are provided at intervals in the circumferential direction ...

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Abstract

The present invention provides a pneumatic tire in which snow performance is improved while the occurrence of pattern noise is suppressed. A center land part (10A), intermediate land parts (10B), andshoulder land parts (10C) are each provided with a plurality of sipes (11, 12, 13) arranged at intervals in the circumferential direction of the tire. The sipes (11) each have, at one end thereof, a large-width section (14), which is formed to have a large groove width. The sipes (13) extend from outside a grounding end (E), in the width direction of the tire, toward outer main grooves (9B). The directions in which the sipes (11, 13) extend, with respect to the circumferential direction of the tire, are opposite to the direction in which the sipes (12) extend. The inclination angle theta CE ofthe sipes (11), the inclination angle theta MD of the sipes (12), and the inclination angle theta SH of the sipes (13) satisfy the relationship theta CE < theta MD < theta SH <90 degrees. Ends (12a)of the sipes (12) adjacent to inner main grooves (9A) are located between ends (11a) of the sipes (11). At least the sipes (11) or the sipes (12) are located on the meridian of the tire at any position on the entire circumference of the tire.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable as an all-season tire, and more specifically, to a pneumatic tire capable of suppressing pattern noise and improving snow performance. Background technique [0002] For all-season tires, excellent snow performance is required in snowfall. In view of this, in conventional all-season tires, a plurality of sipes are provided on each land portion divided by a plurality of main grooves, thereby increasing edge components and improving snow performance (for example, refer to Patent Document 1). However, there is a problem that the variation of the groove area in the ground contact tip line due to the arrangement of the sipes provided in the tread portion becomes large, and pattern noise tends to be generated easily. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2014-205410 Contents of the invention [0006] The problem to be s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/12
CPCB60C11/0306B60C2011/0388B60C2011/0383B60C2011/0341B60C2011/0395B60C2011/0374B60C2011/1209B60C11/1281B60C11/1236B60C2011/0372B60C2011/0381B60C2011/0339
Inventor 渡边大辅
Owner THE YOKOHAMA RUBBER CO LTD
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