KR100460389B1 - A Pneumatic Radial Tire for Heavy Duty - Google Patents

Abstract

The present invention relates to a heavy-duty pneumatic radial tire that improves wear resistance and improves durability life, and forms a center groove (G2) along a center line (C) in the circumferential direction of the tread, and the center groove is an axis. To form a center block K2, a shoulder groove G1, and a shoulder block K1 symmetrically, with two sipes 1, 2, and one lateral groove within one pitch of the center block K2. It is composed of 3).

Description

Pneumatic Radial Tire for Heavy Duty

The present invention relates to a pneumatic radial tire for heavy loads and long distances, and more particularly, to effectively suppress uneven wear such as rail wear and to improve braking and driving power without causing any deterioration in performance. The present invention relates to a heavy-loaded pneumatic radial tire that has a tread pattern configured to prevent separation due to heat generation while driving, thereby increasing the durability of the tire.

Conventionally, a tire tread pattern as shown in FIG. 1 has been proposed in order to prevent uneven wear such as rail wear of a tire, in which grooves g1 and g2 formed in the circumferential direction of the tire are formed, and therebetween. At the same time, rib blocks b1, b2, b3, and b4 are formed, and at the same time, the rib blocks are formed in the grooves and sipes K are formed at right angles to the circumferential direction. C is a tire circumferential center line.

Such a conventional tire tread pattern has a sipe K opened by the circumferential grooves g1 and g2 in the rib blocks b1, b2, b3 and b4 partitioned by grooves g1 and g2 formed in the circumferential direction. It is intended to prevent the occurrence of wear and tear such as railway wear occurring on the rib block edge part while driving.

However, the above-described conventional tread pattern is effective for suppressing uneven wear such as rail wear, but by lowering the rigidity of the tread block, the wear resistance may be degraded or may be connected to the separation due to the heavy load caused by the flow of the block and the heat generated during high-speed driving at a long distance. There is a problem that can be.

In addition, in order to improve the traction performance according to braking and driving of the tire while driving in the related art, the tread blocks 4, 5, 6, and 7 as shown in FIG. ) To have the tread surface block protrusions 12, 13, 14, and 15 protruding into the groove 8 to improve driving and braking force.

However, such a tread pattern also has a problem in that the wear resistance may be degraded as described above, or may be connected to the separation due to heat generation during heavy loads and long-distance high-speed driving due to the flow of blocks.

The present invention has been made to improve the problems of the conventional tire tread pattern as described above, to suppress the wear and tear, such as rail wear, to improve the braking force and driving force, and to prevent the separation due to heat generation while driving An object of the present invention is to provide a pneumatic radial tire for a heavy load in which a tread pattern is configured to increase a tire's durability life.

1 is a plan view showing a tread pattern of a tire according to the prior art,

2 is a plan view showing a tread pattern of another conventional tire,

3 is a plan view showing a tread pattern of a tire according to the present invention,

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

5 is a cross-sectional view taken along the line R-Q of FIG.

6 is a cross-sectional view taken along line G-G of FIG.

7 is a cross-sectional view taken along the line N-M of FIG.

8 is a cross-sectional view taken along the line F-E of FIG. 3.

<Explanation of symbols for the main parts of the drawings>

C ... tire circumferential center line, 1,2 ...

3 ... lateral groove, G1 ... shoulder groove,

G2 ... Center Groove,

Shoulder blocks separated by K1 ... G1,

Center block separated by K2 ... G1 and G2,

N, F, R ... end point where center block (K2) and groove (G1) contact,

M, E, Q ... end point where center block (K2) and groove (G2) contact,

e ... the angles of the sipes (1, 2) and the lateral grooves (3),

P ... 1 pitch.

Heavy-duty pneumatic radial tire of the present invention for achieving the above technical problem, forming a center groove along the center line in the circumferential direction of the center of the tread, the center block, shoulder groove, And a shoulder block, respectively, wherein the center block forms two sipes between the lateral groove and the adjacent lateral groove, and both ends thereof open to the shoulder groove and the center groove, respectively.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a plan view showing a tread pattern of a heavy-duty pneumatic radial tire according to the present invention, wherein the tire tread pattern according to the present invention forms a center groove G2 along a center line C in the circumferential direction of the tread. In addition, center blocks K2, shoulder grooves G1, and shoulder blocks K1 are respectively formed symmetrically with the center grooves as axes, wherein the center blocks K2 are transversely adjacent to the horizontal grooves 3. Two sipes 1 and 2 are respectively formed between the grooves 3, and both ends thereof are opened to the shoulder grooves G1 and the center grooves G2, respectively.

That is, the pattern according to the present invention has a configuration that is vertically symmetrical with respect to the tire center line (C), the two sipes (1, 2) and the lateral groove (3) continuously in one pitch of the center block (K2) It is characterized by forming.

Here, the lateral grooves 3 and the sipes 1, 2 are formed to be inclined with respect to the tire circumferential direction, and both ends thereof are opened in a direction perpendicular to the circumferential direction of the tire.

At this time, it is preferable that the two sipes 1 and 2 and the lateral groove 3 formed in the center block K2 satisfy the following equations.

L1 = 1 / 3P, L2 = 2 / 3P, L3 = P ............. See FIG. 3

0.082P ≤L4 ≤0.092P

0.37P ≤L5 ≤0.47P

0.70P ≤L6 ≤0.80P

Here, P is the length between the end point (R) of the other side grooves (3) opened toward the shoulder groove (G1),

L1 is the length from the end point R of the lateral groove 3 opened toward the shoulder groove G1 to the end point N of the sipe 1 opened toward the shoulder groove G1 and formed in one direction,

L2 is the length from the end point R of the lateral groove 3 opened toward the shoulder groove G1 to the end point F of the sipe 2 opened toward the shoulder groove G1 and formed in one direction,

L3 is the length from the end point R of the lateral groove 3 opening toward the shoulder groove G1 to the end point R of the lateral groove 3 opening and forming next to the shoulder groove G1,

L4 is a point where the waterline passing through the orthogonal direction with respect to the circumferential direction at the end point R of the lateral groove 3 opened toward the shoulder groove G1 and the boundary line of the center block K2 toward the center groove G2 ( The length from J) to the end point M opened toward the center groove G2 of the adjacent sipe 1 in one direction,

L5 is a point where the waterline passing through the orthogonal direction with respect to the circumferential direction at the end point R of the lateral groove 3 opened toward the shoulder groove G1 and the boundary line of the center block K2 toward the center groove G2 ( The length from J) to the end point E opened toward the center groove G2 of the adjacent sipe 2 in one direction,

L6 is a point where the waterline passing through the orthogonal direction with respect to the circumferential direction at the end point R of the lateral groove 3 opened toward the shoulder groove G1 and the boundary line of the center block K2 toward the center groove G2 ( It is the length from J) to the end point Q opened toward the center groove G2 of the laterally formed lateral groove 3.

L1 = 1 / 3P, L2 = 2 / 3P, L3 = P means that L1, L2, L3 are formed at equal intervals within 1 pitch. If L4 separated by sipe 1 is less than 0.082P, 1 The inner blocks separated by the sipe 1 occupying within the pitch are formed too narrowly, causing uneven wear and wear. In addition, if the interval of L4 is larger than 0.092P, the width of the intermediate block divided into sipe 1 and sipe 2 is too small, which adversely affects the wear reduction and uneven wear.

In addition, if the interval of L5 is less than 0.37P, the width of the intermediate block divided into sipe 1 and sipe 2 occupies within one pitch becomes too small, which adversely affects abrasion and wear, and the interval of L5 is larger than 0.47. In this case, the width of the same block divided into sipe 2 and sipe 3 becomes too small, which also adversely affects wear and wear.

In addition, if the spacing of L6 is less than 0.70P, the width of the outer block divided into sipe 2 and sipe 3 occupies within 1 pitch is too small, which adversely affects wear and wear, and the spacing of L6 is greater than 0.80P. If large, the sipe 1 will have a lower inner block width, which is disadvantageous to wear.

0.12H ≤ h ≤ 0.23H ..................... 4 6 see

Where H is the width of the shoulder groove G1,

h is the width of the lateral groove 3.

At this time, when the width h of the lateral groove 3 is less than 0.12H, the lateral groove width becomes too small, the traction performance is lowered, and when h is larger than 0.23H, the lateral groove width becomes larger. It is advantageous in terms of traction, but causes a decrease in block rigidity, which is disadvantageous to wear and uneven wear.

0.06W ≤ W1 = W2 ≤ 0.17W ..................... See Figure 3

Where W is the maximum width of the center block K2,

W1 is a length perpendicular to the circumferential direction opened toward the center groove G2 of the sipes 1 and 2 and the lateral groove 3,

W2 is a length perpendicular to the circumferential direction opened toward the shoulder groove G1 of the sipes 1 and 2 and the lateral groove 3.

At this time, the vertical heights W1 of the M, E and Q sides of the sipes 1, 2 and the lateral grooves 3, and the vertical heights W2 of the N, F, R sides of the sipes 1, 2 and the horizontal grooves 3 are determined. If less than 0.06W with respect to W, the maximum width of the center block K2, the wear resistance is less effective. If it is larger than 0.17W, excessive ground pressure is applied to the edges of W2 and W1 during driving. Will work.

0.27S ≤S1 ≤0.48S

0.11S ≤S2 ≤0.22S

0.65S ≤S3 ≤0.86S

S4 = 0.5S3 ........................... 4, See 5,7,8

Where S is the depth of the shoulder groove G1,

S1, S2 is the depth of the sipe (1, 2),

S3 and S4 are the depths of the lateral grooves 3.

At this time, if the depth of the sipe (1,2) S1 is less than 0.27S, the depth of the sipe (1,2) is too small to reduce the wear-resistant effect, if deeper than 0.48S, the flow of the block This results in adverse effects on wear. In addition, if the depth S2 of the sipe (1,2) is less than 0.11S, the depth of the sipe (1,2) is too small to reduce the wear-resistant effect, if larger than 0.22S, the flow of the block It gets worse and worsens the wear.

In addition, when the depth of the lateral groove 3 S3 is less than 0.65S, the depth of the lateral groove 3 is too small to reduce the wear resistance, and when the depth is greater than 0.86S, the flow of blocks is caused. It acts against wear.

In addition, S4, which is the depth of the lateral groove 3, is formed at 0.5 S3, whereby the optimum wear resistance can be improved and the wear control can be suppressed.

0.20T ≤T1 = T4 = T5 = T6 ≤0.32T

0.07T ≤T2 = T3 ≤ 0.18T ............... See Figures 5,7,8

Where T is the length of the sipes (1, 2) and the transverse groove (3),

T1 and T3 are the lengths of the portions where the sipes 1 and 2 are opened to the shoulder groove G1,

T2, T4 is the length of the portion where the sipes (1, 2) are opened to the center groove (G2),

T5 and T6 are the lengths of the openings of the shoulder of the lateral groove 3 and the center grooves G1 and G2.

N side length T1 of sipe 1 and E side length T4 of sipe 2 are formed in the same length, and it is comprised similarly to the length of lateral groove 3, T5 and T6, M side length T2 of sipe 1, and F side of sipe 2 The length T3 is composed of the same length. At this time, when T1 = T4 = T5 = T6 is less than 0.20T, it is difficult to effectively suppress uneven wear due to the difference in block stiffness when driving, and when larger than 0.32T, block flow is caused.

In addition, when T2 = T3 is less than 0.07T, it is also disadvantageous to uneven wear due to the difference in block stiffness, and when greater than 0.18T, it is disadvantageous to suppression due to wear and uneven wear due to block flow.

According to the heavy-loaded pneumatic radial tire of the present invention having the above objects and configurations, it is possible to effectively suppress uneven wear such as rail wear and to effectively separate the heat generated during driving without causing any deterioration in performance. By suppressing, the durability life of a tire can be improved.

Claims (8)

delete delete delete A center groove G2 is formed along the center circumferential center line C of the tread, and the center block K2, the shoulder groove G1, and the shoulder block K1 are symmetrically about the center groove. In the pneumatic radial tire for heavy loads to form each, The center block K2 forms two sipes 1 and 2 between the lateral grooves 3 and the adjacent lateral grooves 3, respectively, and both ends thereof have shoulder grooves G1 and center grooves G2. ) To open, The sipes 1 and 2 formed in the center block K2 are formed at equal intervals, and the sipes 1 and 2 and the lateral grooves 3 have the following relationship. tire. 0.082P ≤L4 ≤0.092P 0.37P ≤L5 ≤0.47P 0.70P ≤L6 ≤0.80P Here, P is the length between the end point (R) of the other side grooves (3) opened toward the shoulder groove (G1), L1 is the length from the end point R of the lateral groove 3 opened toward the shoulder groove G1 to the end point N of the sipe 1 opened toward the shoulder groove G1 and formed in one direction, L2 is the length from the end point R of the lateral groove 3 opened toward the shoulder groove G1 to the end point F of the sipe 2 opened toward the shoulder groove G1 and formed in one direction, L3 is the length from the end point R of the lateral groove 3 opening toward the shoulder groove G1 to the end point R of the lateral groove 3 opening and forming next to the shoulder groove G1, L4 is a point where the waterline passing through the orthogonal direction with respect to the circumferential direction at the end point R of the lateral groove 3 opened toward the shoulder groove G1 and the boundary line of the center block K2 toward the center groove G2 ( The length from J) to the end point M opened toward the center groove G2 of the adjacent sipe 1 in one direction, L5 is a point where the waterline passing through the orthogonal direction with respect to the circumferential direction at the end point R of the lateral groove 3 opened toward the shoulder groove G1 and the boundary line of the center block K2 toward the center groove G2 ( The length from J) to the end point E opened toward the center groove G2 of the adjacent sipe 2 in one direction, L6 is a point where the waterline passing through the orthogonal direction with respect to the circumferential direction at the end point R of the lateral groove 3 opened toward the shoulder groove G1 and the boundary line of the center block K2 toward the center groove G2 ( It is the length from J) to the end point Q opened toward the center groove G2 of the laterally formed lateral groove 3. The method of claim 4, wherein The lateral groove (3) is a pneumatic radial tire for a heavy load, characterized in that to have the following relationship. 0.12H ≤h ≤0.23H Where H is the width of the shoulder groove G1, h is the width of the lateral groove 3. The method of claim 4, wherein The pneumatic radial tire for heavy loads, characterized in that the sipes (1,2) and the lateral grooves (3) formed in the center block (K2) have the following relationship. 0.06W ≤W1 = W2 ≤0.17W Where W is the maximum width of the center block K2, W1 is a length perpendicular to the circumferential direction opened toward the center groove G2 of the sipes 1 and 2 and the lateral groove 3, W2 is a length perpendicular to the circumferential direction opened toward the shoulder groove G1 of the sipes 1 and 2 and the lateral groove 3. The method of claim 4, wherein The pneumatic radial tire for heavy loads, characterized in that the sipes (1,2) and the lateral grooves (3) formed in the center block (K2) have the following relationship. 0.27S ≤S1 ≤0.48S 0.11S ≤S2 ≤0.22S 0.65S ≤S3 ≤0.86S S4 = 0.5S3 Where S is the depth of the shoulder groove G1, S1, S2 is the depth of the sipe (1, 2), S3 and S4 are the depths of the lateral grooves 3. The method of claim 4, wherein The pneumatic radial tire for heavy loads, characterized in that the sipes (1,2) and the lateral grooves (3) formed in the center block (K2) have the following relationship. 0.20T ≤T1 = T4 = T5 = T6 ≤0.32T 0.07T ≤T2 = T3 ≤ 0.18T Where T is the length of the sipes (1, 2) and the transverse groove (3), T1 and T3 are the lengths of the portions where the sipes 1 and 2 are opened to the shoulder groove G1, T2, T4 is the length of the portion where the sipes (1, 2) are opened to the center groove (G2), T5 and T6 are the lengths of the openings of the shoulder of the lateral groove 3 and the center grooves G1 and G2.