KR101010750B1 - A heavy-duty pneumatic radial tire - Google Patents

Abstract

The present invention effectively suppresses uneven wear such as rail wear on the edge of the block while driving, and improves braking force and driving force without causing any deterioration in performance, and prevents separation due to heat generation while driving. It is an object of the present invention to provide a pattern structure of a pneumatic radial tire for a heavy load that can increase the service life of the tire.

To this end, the present invention has a center groove formed on both sides with respect to the center line of the tire tread width, and a center-shoulder groove formed at a predetermined distance from the center groove, wherein each of the center groove and the center-shoulder groove is formed of the tire. A longitudinal groove which is repeatedly formed in a zigzag shape in which the protrusion and the recess are circumferentially formed; Transverse grooves formed on both sides of the shoulder of the tire to be staggered with each other at the same pitch as the longitudinal groove in the width direction of the tire; A center block for partitioning between the center grooves, a center block for partitioning between the center grooves and a center-shoulder groove and a shoulder block for partitioning between each one side and a shoulder portion of the center-shoulder groove; Semi-grooves inclined at a predetermined angle at a predetermined interval, one per pitch, in the center-shoulder block between the center groove and the center-shoulder groove so as to communicate with the center groove and the center-shoulder groove; Has a tread pattern comprising a center-shoulder block and a shoulder block disposed on both sides with respect to the centerline, and the center groove and the center-shoulder groove are formed in a point-symmetrical shape with respect to the centerline It features.

Tires, Heavy Duty, Rail Wear, Single Wear, Separation

Description

Pneumatic radial tire for heavy load {A HEAVY-DUTY PNEUMATIC RADIAL TIRE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic radial tire for a heavy load, and more particularly, to effectively suppress uneven wear such as rail wear, which occurs at the edge of a block during driving, in overload / long-haul tires. The heavy-duty pneumatic radial tire is designed to improve the braking force and driving force without causing any deterioration of performance, and to improve the tread pattern to prevent the separation caused by heat generation while driving. It relates to a pattern structure.

In general, heavy-duty pneumatic radial tires (also called TBR tires), which are frequently used in buses and trucks, are rough block patterns, that is, tires on treads that are grounded and grounded to improve driving force, braking force, and rain drainage. It is designed to have a plurality of rib patterns formed in the circumferential direction of. By the way, the tire having the rib pattern structure as described above, the wear and tear, such as polygonal or railway wear occurs at the edge of the block during the overload / long distance driving, the ride comfort is reduced, as well as the mileage (mileage) and durability is greatly reduced There was a problem.

Conventionally, in order to prevent such wear, a tire tread pattern as shown in FIG. 1 has been proposed, which is formed by rib blocks B1 and B2 partitioned by grooves G1 and G2 formed in the circumferential direction of the tire. By forming a plurality of sipes (K) opening in the grooves (G1, G2) in the width direction of the tire in the B3, B4, to prevent uneven wear such as railway wear generated at the edge of the rib block while driving It is. Reference numeral "C" denotes a center line in the circumferential direction of the tire.

However, the tread pattern has a problem in that the wear resistance is lowered by lowering the rigidity of the block, or the separation of the cord of the tire may occur due to the heat generated by the flow of the block during overload and long-distance high-speed driving. .

Meanwhile, as disclosed in Korean Patent Application Laid-Open No. 2001-0048456, an inclined reinforcement is formed at each of the leading edge and the rear edge of the block of the shoulder portion, and the inclined reinforcement portions are located at opposite positions with respect to the center line of the block. By forming, a tread pattern has been proposed to enhance the block stiffness of the shoulder portion so as to reduce uneven wear. A tread pattern has been proposed to improve the traction performance and drainage by inserting an edge groove in the part.

However, such a tread pattern also causes problems similar to those of the tread pattern in which the sipes K are formed as described above, and also causes a decrease in traction when driving on a dirt road.

Therefore, the present invention effectively suppresses uneven wear such as rail wear on the edge of the block during the overload / long-haul tire, and improves braking force and driving force without causing any deterioration in overall performance. It is an object of the present invention to provide a heavy-duty pneumatic radial tire that can increase the durability life of a tire by preventing separation due to heat generation while driving.

In order to achieve the above object, the present invention has a center groove formed on both sides with respect to the center line of the tire tread width, and a center-shoulder groove formed at a predetermined distance from the center groove, and the center groove and the center-shoulder groove Longitudinal grooves each of which is repeatedly formed in a zigzag form, which is a protrusion and a recess in a circumferential direction of the tire;

Transverse grooves formed on both sides of the shoulder of the tire to be staggered with each other at the same pitch as the longitudinal groove in the width direction of the tire;

A center block for partitioning between the center grooves, a center block for partitioning between the center grooves and a center-shoulder groove and a shoulder block for partitioning between each one side and a shoulder portion of the center-shoulder groove;

Semi-grooves inclined at a predetermined angle at a predetermined interval, one per pitch, in the center-shoulder block between the center groove and the center-shoulder groove so as to communicate with the center groove and the center-shoulder groove;

Has a tread pattern comprising a,

The center-shoulder block and the shoulder block respectively disposed on both sides of the center line, and the center groove and the center-shoulder groove are formed in a point symmetrical shape with respect to the center line.

In the present invention, the center block, characterized in that the main groove having a width smaller than the width of the center groove and the center-shoulder groove is formed along the center line.

In the present invention, the shoulder portion is characterized in that a plurality of sipes per pitch are formed at regular intervals.

In addition, in the present invention, the semi-groove formed in the center-shoulder block and the semi-groove formed in the center-shoulder block are characterized by having a form of parallel movement to the left or right with respect to the center line.

Further, in the present invention, the semi groove has a structure in which both ends thereof are bent and has a structure inclined upwardly from the start end thereof to the end thereof.

Further, in the present invention, the beginning and the end of the semi groove are located in the recess of the center groove and the recess of the center-shoulder groove, respectively, and the beginning and the end of the semi groove are respectively the recesses of the center-shoulder groove. It is characterized in that it is located in the recess of the center groove.

In the present invention, the center groove and the center-shoulder groove, and the center block, the center-shoulder block and the shoulder block are formed to satisfy the following relationship.

0.05TW≤GW1 and GW4≤0.07TW

0.05TW≤GW2 and GW3≤0.07TW

0.15TW≤RW1 and RW5≤0.25TW

0.08TW≤RW2 and RW4≤0.13TW

Where TW is the tread width of the tire, GW1 and GW4 are the widths of the center-shoulder grooves formed between the center-shoulder block and the shoulder block, GW2 and GW3 are the widths of the center grooves formed between the center block and the center-shoulder block, RW1 and RW5 are the width of the shoulder block with the longest length seen in the outermost line of the tread of the tire, and RW2 and RW4 are the widths between the two concave edges of the center-shoulder block)

In addition, in the present invention, the longitudinal groove is characterized in that the angle between the concave edge and the convex edge of the center-shoulder block and the shoulder block is formed to 70 ° ~ 80 °.

Further, in the present invention, the lateral groove is 5 of RW1 or RW5 where the vertical distance of the lateral groove in the outermost line of the tread of the tire is the width of the shoulder block having the longest length as seen in the outermost line of the tread of the tire. Characterized in that it is formed in the range of% to 10%.

As described above, according to the present invention, it is possible to effectively suppress uneven wear occurring at the edge of the block contacting the longitudinal groove, and to improve the braking force and the driving force without causing any deterioration in performance, and to separate the heat generated during driving. It is possible to increase the durability life of the tire by preventing the.

Hereinafter, the pattern structure of the pneumatic radial tire for a heavy load of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the tread portion of the heavy-load pneumatic radial tire according to the present invention has five blocks B1, B2, B3, B4, and B5 in four longitudinal grooves G1, G2, G3, and G4. It is partitioned by, and the block and the longitudinal groove have the pattern structure formed in the zigzag form in the circumferential direction (running direction) of a tire.

The longitudinal grooves G1, G2, G3, and G4 are center grooves G2 and G3 formed on both sides with respect to the center line C of the tire tread width TW and the center grooves G2 and G3, respectively. A zigzag shape in which the center-grooves G1 and G4 are formed to be spaced apart from each other, and the center grooves G2 and G3 and the center-shoulder grooves G1 and G4 each become protrusions and recesses in the circumferential direction of the tire. It is made to be formed repeatedly.

The blocks B1, B2, B3, and B4 divide the center block B3, which divides the center grooves G2 and G3, and the center grooves G2 and G3, and the center-shoulder grooves G1 and G4, respectively. To include the center-shoulder block (B2, B4) and the shoulder block (B1, B5) for partitioning between each side of the center-groove (G1, G4) and the shoulder portion.

Here, the center block (B3), the main groove (MG) having a width smaller than the width of the center grooves (G2, G3) and the center-shoulder grooves (G1, G4) is formed along the center line (C). It is. The center block B3 is equally divided and partitioned by the main groove MG.

The center grooves G2 and G3 and the center-shoulder grooves G1 and G4 are arranged in different directions as shown in FIG. 2.

In particular, one set of the center-shoulder groove G4 and the center groove G and one set of the center groove G2 and the center-shoulder groove G1 are left or right with respect to the centerline C. It has a parallel translation form.

Further, the center-shoulder blocks B2 and B4 and the shoulder blocks B1 and B5 respectively disposed on both sides of the centerline C, the center grooves G2 and G3 and the center-shoulder grooves G1, G4) is formed in a point symmetrical shape with respect to the center line (C). That is, the center groove G2 and the center groove G3 are formed in a point symmetrical shape with respect to the center line C, and the center-shoulder groove G1 and the center-shoulder groove G4 are formed. Are formed in a point symmetrical shape with respect to the center line (C). As the center grooves G3 and G3 and the center-shoulder grooves G1 and G4 are formed in a point symmetrical shape, the center-shoulder block on the right side of the center line C is formed. B2) and the center-shoulder block B4 on the left side are formed in a point symmetrical shape, and likewise, the shoulder block B1 on the right side and the shoulder block B5 on the left side are formed in point symmetry with each other. Similarly, the center block B3 is formed in a point symmetrical shape with respect to the left and right sides based on the main groove MG.

)가 70°∼80°를 이루도록 형성된다. On the other hand, on the center-shoulder blocks B2 and B4 and the shoulder blocks B1 and B5 in contact with the longitudinal grooves G1, G2, G3 and G4, the center grooves G2 and G3 and the center- formed in the zigzag shape. Concave and convex edges are formed by the shoulder grooves G1 and G4. As a result, the longitudinal grooves G1, G2, G3, and G4 are formed by the angles of the concave and convex edges of the center-shoulder blocks B2 and B4 and the shoulder blocks B1 and B5.

) Is formed to form 70 ° to 80 °.

) 및 1 피치 기준선(O)과 센터-숄더블록(R2) 상의 점 P6에서 점 P5를 연결하는 선이 이루는 각도(

)는 70˚∼ 80˚를 이룬다. For example, end points where the shoulder block B1 and the center-shoulder groove G1 are in contact with each other are called P1, P2, and P3, and end points where the center-shoulder block B2 and the center-shoulder groove G1 are in contact with each other are P4. , P5, P6, and when the imaginary line perpendicular to the circumferential direction of a point where the zigzag shape of the longitudinal grooves G1, G2, G3, and G4 starts is referred to as 1 pitch reference line O, 1 The angle between the pitch reference line O and the line connecting point P2 at point P3 on shoulder block B1 (

) And the angle between the pitch 1 line O and the line connecting point P5 at point P6 on center-shoulder block R2 (

) Forms 70˚ ~ 80˚.

In addition, on the center-shoulder blocks B2 and B4, the semi-grooves are spaced one by one per pitch P so as to communicate with the center grooves G2 and G3 and the center shoulder grooves G1 and G4. SG1, SG2, SG3, SG4) are formed. The semi grooves SG1, SG2, SG3 and SG4 are arranged to be inclined at a predetermined angle in the tread width direction of the tire. In more detail, the semi grooves SG1, SG2, SG3, and SG4 have a structure in which both ends are bent and incline upward from the start end to the end. Here, the start and end of the semi grooves SG1 and SG2 are respectively located at the recesses of the center groove G2 and the recesses of the center-shoulder groove G1, and the start and end of the semi grooves SG3 and SG4 are respectively. Respectively located in the recess of the center-shoulder groove G4 and the recess of the center groove G3.

Semi-grooves SG1 and SG2 formed in the center-shoulder block B2 and semi-grooves SG3 and SG4 formed in the center-shoulder block B4 have a shape in which they are moved in parallel with respect to the center line C. FIG. Have

On the other hand, reference numeral "LG" in Fig. 2 indicates a lateral groove formed in the shoulder portion of the tire. The lateral groove LG has the longitudinal grooves G1, G2, G3, when the circumferential length of one zigzag shape is 1 pitch P in the longitudinal grooves G1, G2, G3, G4. It is formed at the same pitch P as G4). The shoulder portion is provided with a plurality of sipes S per pitch at regular intervals.

Meanwhile, the center grooves G2 and G3 and the center-shoulder grooves G1 and G4, and the center blocks B3, the center-shoulder blocks B2 and B4 and the shoulder blocks B1 and B5 have the following relationship. It is preferable that it is formed to satisfy.

0.05TW≤GW1 and GW4≤0.07TW

0.05TW≤GW2 and GW3≤0.07TW

0.15TW≤RW1 and RW5≤0.25TW

0.08TW≤RW2 and RW4≤0.13TW

Where TW is the tread width of the tire, GW1 and GW4 are the widths of the center-shoulder grooves G1 and G4 formed between the center-shoulder blocks B2 and B4 and the shoulder blocks B1 and B5, and GW2 and GW3 are the centers. The width of the center grooves G2 and G3 formed between the blocks B2 and B4 and the center-shoulder blocks B2 and B4, RW1 and RW5, is the shoulder block having the longest length as seen in the outermost line of the tread of the tire ( The widths of B1 and B5, RW2 and RW4, indicate the widths between both concave edges of the center-shoulder blocks B2 and B4.

In the above relation, when GW1, GW2, GW3 and GW4 are less than 0.05TW, the width of the center grooves G2 and G3 and the center-shoulder grooves G1 and G4 is too narrow, which is advantageous to wear, but generates heat. The effective divergence becomes difficult, which adversely affects the separation, and when the GW1, GW2, GW3 and GW4 are larger than 0.07TW, the width of the center groove (G2, G3) and the center-shoulder groove (G1, G4) The width of the blocks B1, B2, B3, B4, and B5 narrows, which may cause a decrease in abrasion, because the width of the blocks B1, B2, B3, B4, and B5 decreases.

In addition, if RW1 and RW5 are less than 0.15TW, there is a fear of promoting the partial wear and premature wear of the shoulder blocks B1 and B5, whereas if the RW1 and RW5 are larger than 0.25TW, the shoulder blocks B1 and B5 are ) Becomes too wide, which adversely affects separation caused by heat generation.

Similarly, if RW2 and RW4 are less than 0.08TW, there is a fear of promoting premature wear of the center-shoulder blocks B2 and B4, while if RW2 and RW4 are larger than 0.13TW, the center-shoulder block (B2) , B4) becomes too large, which adversely affects separation due to heat generation.

The lateral groove LG has a vertical distance LGH of the lateral groove LG at the outermost line L of the tread of the tire to improve lateral slip and traction while the vehicle is running. It is preferable that it is formed so that it may exist in the range of 5 to 10% of RW1 or RW5 which is the width | variety of the shoulder blocks B1 and B5 which have the longest length in the outer line L. As shown in FIG.

Although the present invention has been described with respect to the preferred embodiment, the present invention is not limited thereto, and those skilled in the art will be able to variously modify and apply the same within the scope of the present invention.

1 is a plan view of a conventional tire tread pattern.

Figure 2 is a plan view showing a pattern structure of a pneumatic radial tire for a heavy load according to the present invention.

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

B1, B5: shoulder block

B2, B4: Center-Shoulder Block

B3: Center Block

G1, G4: Center to Shoulder Groove

G2, G3: Center Groove

MG: Main Groove

LG: Lateral Groove

SG1, SG2, SG3, SG4: Semi Groove

Claims (9)

Center grooves G2 and G3 respectively formed on both sides of the center line C of the tire tread width TW, and center-shoulder grooves G1 and G4 formed at a predetermined distance from the center grooves G2 and G3. The grooves G1, G2, G3, and G4 each having the center grooves G2 and G3 and the center-shoulder grooves G1 and G4 are repeatedly formed in a zigzag form, which is a protrusion and a recess in the circumferential direction of the tire. ); Transverse grooves (LG) formed on both sides of the shoulder of the tire to be staggered with each other at the same pitch as the longitudinal grooves (G1, G2, G3, and G4) in the width direction of the tire; A center block B3 partitioning between the center grooves G2 and G3, and a center-shoulder block B2 and B4 partitioning between the center grooves G2 and G3 and the center-shoulder grooves G1 and G4, respectively. And shoulder blocks (B1, B5) for partitioning between each side of the center-groove (G1, G4) and the shoulder portion; Center-shoulder blocks B2 and B3 between the center grooves G2 and G3 and center-shoulder grooves G1 and G4 to communicate with the center grooves G2 and G3 and center-shoulder grooves G1 and G4. Semi grooves (SG1, SG2, SG3, SG4) formed to be inclined at a predetermined angle at intervals of one per pitch in each; Has a tread pattern comprising a, Center-shoulder blocks (B2, B4) and shoulder blocks (B1, B5) and center grooves (G2, G3) and center-shoulder grooves (G1, G4) disposed on the left and right sides based on the center line (C), respectively The pneumatic radial tire for a heavy load, characterized in that is formed in a point symmetrical shape with respect to the center line (C). The method of claim 1, In the center block B3, a main groove MG having a width smaller than that of the center grooves G2 and G3 and the center-shoulder grooves G1 and G4 is formed along the center line C. Pneumatic radial tire for heavy loads, characterized in that. The method of claim 1, The pneumatic radial tire for a heavy load, characterized in that the shoulder portion is formed with a plurality of sipes (S) per pitch at regular intervals. The method of claim 1, Semi grooves SG1 and SG2 formed in the center-shoulder block B2 and semi grooves SG3 and SG4 formed in the center-shoulder block B4 are parallel to the left or right with respect to the center line C. FIG. A heavy-duty pneumatic radial tire, characterized in that it has a moved shape. The method of claim 1, The semigrooves SG1, SG2, SG3, and SG4 have a structure in which both ends thereof are bent, and have a structure inclined upwardly from the start end thereof to the end thereof. Heavy-duty pneumatic radial tires. The method of claim 5, The beginning and the end of the semi grooves SG1 and SG2 are respectively located at the recesses of the center groove G2 and the recesses of the center-shoulder groove G1, and the beginning and ends of the semi grooves SG3 and SG4 are respectively. A heavy-duty pneumatic radial tire, each of which is located in a recess of the center-shoulder groove G4 and a recess of the center groove G3. The method according to any one of claims 1 to 6, The center grooves G2 and G3 and the center-shoulder grooves G1 and G4, and the center block B3, the center-shoulder blocks B2 and B4 and the shoulder blocks B1 and B5 satisfy the following relationship. A heavy-duty pneumatic radial tire, characterized in that it is formed to. 0.05TW≤GW1 and GW4≤0.07TW 0.05TW≤GW2 and GW3≤0.07TW 0.15TW≤RW1 and RW5≤0.25TW 0.08TW≤RW2 and RW4≤0.13TW Where TW is the tread width of the tire, GW1 and GW4 are the widths of the center-shoulder grooves formed between the center-shoulder block and the shoulder block, GW2 and GW3 are the widths of the center grooves formed between the center block and the center-shoulder block, RW1 and RW5 are the width of the shoulder block with the longest length seen in the outermost line of the tread of the tire, and RW2 and RW4 are the widths between the two concave edges of the center-shoulder block) The method according to any one of claims 1 to 6, The longitudinal grooves G1, G2, G3, and G4 may be formed by the angles of the concave and convex edges of the center-shoulder blocks B2 and B4 and the shoulder blocks B1 and B5.

Pneumatic radial tire for heavy loads, characterized in that is formed so as to make 70 ° to 80 °. The method according to any one of claims 1 to 6, The lateral groove LG is a shoulder having a longest vertical length LGH of the lateral groove LG at the outermost line L of the tread of the tire as seen from the outermost line L of the tread of the tire. A heavy-duty pneumatic radial tire, which is formed so as to be in a range of 5% to 10% of the width of the blocks B1 and B5, RW1 or RW5.

Images