KR100756327B1 - Tire with symmetrical tread pattern - Google Patents

Abstract

A tire with symmetrical tread patterns is provided to increase draining performance of the tire and to keep braking performance and rigidity of a tread block by optimizing a width ratio of four vertical grooves. A tire with symmetrical tread patterns is formed with four vertical grooves(141) arranged to a circumferential direction of treads(140). The tire satisfies 1.1<M<1.2. M is WB/WA. WA is a width of the vertical groove on the basis of the center of the tread. WB is a width of the outer vertical groove. The tread patterns are designed according to the width ratio of the vertical grooves related to the draining performance.

Description

Tires with Symmetric Tread Patterns {TIRE WITH SYMMETRICAL TREAD PATTERN}

1 is a partial perspective view showing an example of a general tire.

2 is a view showing a tread pattern of a tire according to the present invention.

<Explanation of symbols for main parts of the drawings>

140: tread, 141: bell groove,

M: ratio of longitudinal groove width, WA: width of longitudinal groove inward,

WB: Width of the longitudinal groove on the outside.

The present invention relates to a tire having a symmetrical tread pattern, in particular, to optimize the ratio of the width of the longitudinal groove in a tire having four longitudinal grooves, thereby improving drainage performance while maintaining other braking performance and the stiffness of the tread block. A tire having a symmetrical tread pattern that can be used.

In general, pneumatic tires are configured to maximize the performance of the ride, noise, maneuverability, etc. for the first time.

As shown in FIG. 1, the pneumatic tire includes an inner 10 constituting the inside of the tire, a carcass 20 stacked on an outer circumference of the inner 10, and the carcass 20. A belt 30 stacked on an outer circumference, a tread 40 stacked on an outer circumference of the belt 30 and substantially in contact with the ground, both sidewalls 50 and 50 constituting both sides of the tire, and Both beads 60 and 60 are coupled to the wheels to maintain the air pressure. Such tire technology is well disclosed in Korean Patent Laid-Open Publication No. 2005-51103 and Korean Patent Laid-Open Publication No. 2005-35438.

In such a tire, the tread 40 has a plurality of longitudinal grooves 41 formed in the circumferential direction thereof, and in the width direction thereof, so as to maintain dry traction performance, wet traction performance, noise performance, and the like, which are basic performances thereof. A plurality of trough blocks 43 are formed by the plurality of grooves 41 and 42 formed therein. The external shape of the tread 40 by the grooves 41 and 42 and the tread blocks 43 is usually called a tread pattern.

On the other hand, Korean Patent Laid-Open Publication No. 2002-1245 shows a tire having a symmetrical tread pattern, which has a width for three longitudinal grooves in a tread pattern design for improving tire performance such as drainage performance and wear. Although the position and the position are corrected, although the drainage performance is largely related to the ratio of the width of the longitudinal groove, the correction of the ratio of the width of each longitudinal groove is corrected by the ratio of the ground area. Therefore, the tread pattern design of the prior art has an ineffective problem in the design of the tread pattern to increase the drainage performance, there is also a problem that can not be applied to the design of the symmetrical tread pattern including four longitudinal grooves.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described conventional problems, and by optimizing the ratio of the width of the longitudinal groove in a tire having four longitudinal grooves, it is possible to maintain other braking performance and the stiffness of the tread block while improving drainage performance. It is an object to provide a tire having a symmetrical tread pattern.

In order to achieve the above object, in a tire having a symmetrical tread pattern in which four longitudinal grooves are symmetrically arranged side by side in the circumferential direction of the tread, the width of the longitudinal longitudinal groove of the inner side of the tread is referred to as WA, The width of the longitudinal groove is called WB, and when WB / WA is M, 1.1 <M <1.2 is satisfied.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

2 shows a tread pattern of a tire according to the invention.

In the tire according to the present invention, four longitudinal grooves 141 are symmetrically formed side by side in the circumferential direction of the tread 140, and the horizontal grooves 142 are formed at a predetermined angle with respect to the longitudinal grooves 141. By having a plurality of tread blocks 143 has a symmetrical tread pattern formed.

According to the present invention, in the tread pattern design having four longitudinal grooves 141 in consideration of the fact that the drainage performance and the hydroplaning (Hydroplaning) performance is greatly affected by the width of the longitudinal groove 141, the longitudinal groove 141 The ratio of the width of the field is optimized to improve drainage performance when driving on wet roads.

That is, according to the present invention, the width of the inner longitudinal groove 141 is called WA, and the width of the outer longitudinal groove 141 is called WB based on the center of the tread 140. When the ratio of the width WA is referred to as the ratio M of the width of the longitudinal groove 141, the longitudinal grooves 141 are formed to satisfy the range of 1.1 <M <1.2.

When the ratio (M) of the longitudinal groove width is less than 1.1 or greater than 1.2, the rigidity of the tread block 143 may be weak or accompanied by a decrease in drainage performance. Therefore, the longitudinal grooves 141 are formed to satisfy the range. Should be. In this case, the tire drainage performance when driving the wet road surface is improved, and the braking performance and the rigidity of the tread block 143 can be maintained.

According to the tire having the symmetrical tread pattern according to the present invention configured as described above, in the tread pattern design having four longitudinal grooves 141, the ratio of the width of the longitudinal grooves 141 is optimized to improve tire drainage performance. In addition, since the braking performance and the rigidity of the tread block 143 can be maintained, the tire performance can be improved.

In addition, since the tread pattern design can be carried out with a simple structure in accordance with the ratio of the width of the longitudinal grooves 141 which are largely related to the drainage performance, the tire having the symmetrical tread pattern can be easily designed to have excellent performance. .

Claims (1)

In a tire having a symmetrical tread pattern in which four longitudinal grooves 141 are symmetrically formed side by side in the circumferential direction of the tread 140: When the width of the inner longitudinal groove is called WA, the width of the outer longitudinal groove 141 is called WB, and WB / WA is referred to as M based on the center of the tread. A tire having a symmetrical tread pattern, characterized by satisfying 1.1 <M <1.2.

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