KR100425836B1 - A Pneumatic Tire with Marking of Wear Limit - Google Patents

Abstract

The present invention relates to a pneumatic tire in which the wear limit is displayed, and it is possible to replace the tire in a timely manner by easily grasping the wear progress state of the tire and the replacement time of the worn tire through the sipe (S) formed in the tire tread. In order to form a center groove G2 at the center of the tire tread, shoulder grooves G1 are formed at both shoulder portions, respectively, wherein the grooves have a zigzag shape that is repeated in the circumferential direction of the tire, and the center groove ( A center block K2 is formed between G2) and a shoulder groove G1, and a shoulder block K1 is formed between the shoulder groove G1 and the sidewall of the tire, and a center groove is formed in the center block K2. A sipe S connecting G2 to the shoulder groove, the sipe S having a plurality of different depths over its deployment length L; Which it is characterized in that formed in a step shape.

Description

A Pneumatic Tire with Marking of Wear Limit}

The present invention relates to a pneumatic tire in which the wear limit is indicated, and easily detects the wear progress state of the tire and the time of replacement of the tire where the wear has progressed, so that a pneumatic tire in which a wear limit is indicated at a predetermined portion can be replaced in a timely manner. It is about.

In order to indicate the wear limit of a pneumatic tire, six bars are formed in a groove provided in the circumferential direction of the tire with a depth of 1.6 mm, and the position of the bar is marked on the side wall of the tire. Defined (see FIGS. 1 and 4). However, the wear limit mark provided on the groove along the circumferential direction of the tire is difficult for users to easily grasp, and it is difficult to replace the tire in a timely manner.

In view of such a problem, in addition to marking the wear limit mark on the tire in accordance with the above-described regulations, as shown in FIG. 5, wear is formed by forming the wear limit mark groove M on the shoulder of the tire. Although there is one to be able to visually check the progress of the progress, this also had a problem that can not effectively display the wear limit when the center block (K2) is worn quickly compared to the wear of the shoulder block (K1).

As another method for displaying the wear limit, as shown in FIG. 6, a multi-step stepped jaw is formed on the groove inclined surface of the shoulder groove G1 or the center groove G2 formed in the center portion, whereby the wear progresses. Although the state can be visually confirmed, in the case of forming the groove inclined surface in multiple stages, the base width of the groove becomes too small, and foreign matter such as stones are frequently caught in the gap, or the groove width is narrowed as it is used. There has been a problem that the effective heat dissipation and drainage is reduced.

The present invention has been made to improve the problems according to the conventional wear limit display of the tire as described above, so that it is possible to accurately determine the wear state and replacement time of the tire effectively while driving without deteriorating the overall performance of the tire In addition, it is possible to prevent vehicle rollover accidents due to tire separation or burst, which may occur when tires are not replaced in a timely manner, and to secure high-quality recycled tire fabrics. It is an object of the present invention to provide a pneumatic tire that can improve the life of the recycled tire.

1 is a plan view of a tread pattern of a pneumatic tire according to the present invention,

2 is a cross-sectional view of the sipe taken along a line connecting 1-2 of FIG. 1,

3 is a cross-sectional view of the shoulder groove according to the X-X line of FIG.

4 is a cross-sectional view of the wear limit indicator bar taken along the line X'-X 'of FIG.

5 is a plan view of a conventional tread pattern of a tire,

6 is a cross-sectional view taken along the line A-B of FIG.

(Explanation of reference numerals)

C ... tire center line, D ... depth of groove G1, G2,

d ... depth of tread wear limit bar formed in grooves G1, G2,

F ... tire shoulder parts,

G1 ... shoulder groove formed in the tire shoulder part,

Center groove formed in G2 ... tire center part,

K1 ... Shoulder Block, K2 ... Center Block,

M ... wear limit indication groove, S ....

L ... expansion length from point 1 to point 2 of sipe S,

Bars indicating P ... pitch, Z ... tire wear limits,

T1, T2, T3, T4 ... depth of each section of sipe S,

W1, W2, W3, W4 ... 1/2 of the length of each section of the sipe S,

1 ... the opening of the sipe S on the groove G1 formed in the tire shoulder portion,

2 ... the opening of the sipe S on the groove G2 formed in the tire center portion,

Slope of 3 ... groove, base width of 4 ... groove.

In order to achieve the above technical problem, the pneumatic tire of the present invention forms a center groove (G2) in the center of the tire tread, while forming shoulder grooves (G1) on both shoulder portions, respectively, the grooves Has a zigzag shape repeated in the tire circumferential direction; A center block K2 is formed between the center groove G2 and a shoulder groove G1, and a shoulder block K1 is formed between the shoulder groove G1 and the sidewall of the tire; The center block K2 is provided with a sipe S connecting the center groove G2 and the shoulder groove, and the sipe S has a step shape having a plurality of different depths over its deployment length L. It is characterized by being formed.

Further, in the above-described configuration, the pneumatic tire of the present invention further includes a sipe S in the shoulder block K1, wherein the sipe S is formed in a plurality of different lengths over its deployment length L. Characterized in that it is formed in a step shape having a depth.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of a pneumatic tire according to the present invention.

1 is a plan view of a tread pattern of a pneumatic tire according to the present invention, the tread pattern of the tire according to the present invention is one center groove (G2) formed in the center and shoulder grooves (respectively formed on both shoulders ( Two center blocks K2 and shoulder blocks K1 are formed by G1). That is, the shoulder groove G1 is positioned between the shoulder block K1 and the center block K2, and the center groove G2 is positioned at the center of the tire between the center block K2 and the center block K2. Done. Here, the shoulder block K1 ranges from both sidewalls of the tire to the shoulder groove G1.

On the other hand, as can be seen from FIG. 1, the tire tread patterns in the present invention are formed in the same manner around the center line C of the tire. Therefore, below, one tread pattern centering on the center line C is demonstrated.

The center groove G2 and the shoulder groove G1 are formed so that the zigzag shape is repeatedly repeated in the circumferential direction of the tire. Hereinafter, two zigzag shapes of the grooves are provided to facilitate the description of the present invention. The circumferential length is 1 pitch.

In addition, a sipe S is formed in the center block K2 between the center groove G2 and the shoulder groove G1. One side of the sipe (S) is formed along the inclined surface formed by the center groove (G2) and the center block (K2), the other side is formed along the inclined surface formed by the shoulder groove (G1) and the center block (K2), In order to be connected in a step (段). Here, the sipes (S) form one or two in one pitch.

On the other hand, as shown in FIG. 2, the sipe S extends from the sipe S opening 1 at the tire shoulder groove G1 to the sipe S opening 2 at the center groove G2 side. Rather than being formed at a constant depth with respect to the development length L of, the center is formed at the shallowest depth, while the depth of the sipe is gradually formed gradually step by step with the center as a step shape. .

Here, the relationship between the depths of the sipes S and the depths of the sipes S is expressed by the following expression (1). In other words, the depth of the sipe (S) that is formed most deeply on the tread surface as the T1, and the depth of the sipe (S) in the order of T2, T3, T4 in order to form a shallow depth of the sipe (S) ) And half of the length T1 is formed from the point (1, 2) where the groove meets, and half of the length of T2, T3, T4 is W2, W3, W4, respectively, and the center groove (G2) ) And the depth of the shoulder groove G2 as D (see FIG. 3) and the depth of the tread wear limit indicator bar Z as d, the depth T and the length W of the sipe S are as follows. Construct to satisfy the relation.

T1 = D-d

T2 = 0.75 (D-d)

T3 = 0.5 (D-d)

T4 = 0.25 (D-d)

W1 = 0.25 (L / 2)

W2 = 0.5 (L / 2)

W3 = 0.75 (L / 2)

W4 = L / 2

In addition, in the above description, the multi-stage stepped sipe S is formed in the center block K2, but the present invention is not limited thereto. That is, the shoulder block K1 can be formed with one or two multi-stage stepped sipes S satisfying the above equation in the same pitch as in the center block K2. Here, the sipe S formed in the shoulder block K1 is formed to be inclined toward the tire sidewall along an interface formed between the shoulder groove G1 and the shoulder block K1.

Therefore, as the tire wears while driving, the sipe S gradually disappears with respect to its center part, and the degree of replacement of the tire can be estimated based on the degree.

According to the pneumatic tire of the present invention having the above object and configuration, it is possible to easily grasp the wear progress state of the pneumatic tire, it is easy to grasp when the tire is replaced, the tire can be replaced in a timely manner, Can be prevented in advance.

In addition, since the tires are replaced in a timely manner, it is possible to secure a high quality recycled tire fabric, thereby further improving the lifespan of the recycled tires.

Claims (9)

A center groove G2 is formed at the center of the tire tread, while shoulder grooves G1 are respectively formed at both shoulder portions, the grooves having a zigzag shape repeated in the tire circumferential direction; A center block K2 is formed between the center groove G2 and a shoulder groove G1, and a shoulder block K1 is formed between the shoulder groove G1 and the sidewall of the tire; The center block K2 is provided with a sipe S connecting the center groove G2 and the shoulder groove G1, but the sipe S has a plurality of different depths over its deployment length L. A pneumatic tire, characterized in that formed in a staircase shape. The method of claim 1, The sipe (S), one side is formed along the boundary surface direction formed by the center groove (G2) and the center block (K2), the other side is formed along the boundary surface direction formed by the shoulder groove (G1) and the center block (K2). Pneumatic tire, characterized in that. The method of claim 2, Said sipe S is a sipe S formed along the boundary surface direction which the center groove G2 and the center block K2 make, and is formed along the boundary surface direction which the shoulder groove G1 and the center block K2 make. A pneumatic tire, characterized in that connected to form a sipe (S) and the end (段). The method of claim 3, Said sipe (S) has the shallowest depth in the center part, and is formed so that it may become deeper gradually toward both ends. The method of claim 1, A sipe (S) is further formed in the shoulder block (K1), wherein the sipe (S) is a pneumatic tire, characterized in that formed in a step shape having a plurality of different depths over the deployment length (L). The method of claim 5, Said sipe (S) is a pneumatic tire, characterized in that formed along the interface between the shoulder groove (G1) and shoulder block (K1) toward the tire side wall. The method of claim 4, wherein Said sipe (S) satisfy | fills the following formula, The pneumatic tire characterized by the above-mentioned. T1 = D-d T2 = 0.75 (D-d) T3 = 0.5 (D-d) T4 = 0.25 (D-d) W1 = 0.25 (L / 2) W2 = 0.5 (L / 2) W3 = 0.75 (L / 2) W4 = L / 2 Here, T1 is the depth of the sipe (S) is formed deepest with respect to the tread surface, T2, T3, T4 is the depth of the sipe (S) gradually shallower from the T1, W is one-half the length for each depth from the point (1, 2) where the sipes (S) and grooves meet on the tread surface, where W1, W2, W3, and W4 are respectively T1, T2, T3, and T4. 1/2 of the length corresponding to D is the depth of the shoulder groove G2, d is the depth of the tread wear limit indicator bar (Z). The method according to any one of claims 1 to 7, Said sipe (S), pneumatic tire, characterized in that one is formed per two zigzag repeated in the same shape of the center groove (G2) and shoulder groove (G1). The method according to any one of claims 1 to 7, Said sipe (S), pneumatic tire, characterized in that one is formed per zigzag repeated in the same shape of the center groove (G2) and shoulder groove (G1).