KR20050121111A - Heavy duty pneumatic radial tire - Google Patents

Abstract

The present invention is applied in the circumferential direction of the tire (driving direction) and formed by the center longitudinal groove formed at the center portion of the tread, the shoulder longitudinal groove formed at the shoulder portion of the tread, and partitioned by the center longitudinal groove and the shoulder longitudinal groove. A heavy load pneumatic radial tire having a tread portion comprising a center block formed at a center portion, a shoulder block formed at a shoulder portion, and a center-shoulder block formed between a center block and a shoulder block, wherein all sides of the block have a triangle The groove is formed, characterized by satisfying the following relationship.

<Relationship>

2 ° ≤α≤15 °, 16 ° ≤β≤80 °, 0.4 * P≤c≤0.6 * P

Here, P denotes a tire running direction length for one block, c denotes one side length of the triangular groove, and α and β denote both end angles of the triangular groove.

Description

Heavy Duty Pneumatic Radial Tires

The present invention relates to a heavy-duty pneumatic radial tire, and more particularly, to effectively suppress entanglement when driving, to suppress cut and chip generation in tire tread grooves, to improve braking force when driving on rain, and to entangle the tread. The present invention relates to a heavy-duty pneumatic radial tire that effectively suppresses belt segmentation by improving tire durability.

Conventionally, in order to ensure durability of a tire by crushing, a crushing prevention tool is provided in a tread groove.

This will be described in more detail with reference to FIG. 1.

1 is a plan view of a pattern of a pneumatic radial tire for a heavy load according to a conventional embodiment.

Referring to FIG. 1, in the conventional heavy-duty pneumatic radial tire, a plurality of blocks B1 to B5 are partitioned by grooves G1 and G2, and a center groove G1 positioned at a center portion thereof. An anti-jamming tool (S) was provided in the inside to improve the durability of the tire due to crushing.

However, in the conventional heavy-load pneumatic radial tire, since the widths of the grooves G1 and G2 are uniformly applied, if the stones are caught in the grooves, they do not fall out while driving.

As a result, the stone penetrated the anti-knuckle (S) to the tread section belt layer. As a result, when traveling on a wet road surface, the moisture passed to the belt section and the durability of the tire was significantly reduced.

The present invention has been made to solve the above problems, the object of which is to form a triangular groove on both sides of the block, install the anti-knuckle in the center groove can effectively suppress the crushing during running, rain running performance To provide a heavy-load pneumatic radial tire that can improve the.

In order to achieve the above object, the present invention is applied to the circumferential direction (driving direction) of the tire, the center longitudinal groove formed on the center portion of the tread, the shoulder longitudinal groove formed on the shoulder portion of the tread, the center longitudinal groove and the shoulder In a heavy-loaded pneumatic radial tire having a center block partitioned by a longitudinal groove and formed at the center portion of the tread, and a tread portion including a shoulder block formed at the shoulder portion and a center-shoulder block formed between the center block and the shoulder block. , Triangular grooves are formed on both sides of all the blocks, and the following relational expressions are satisfied.

<Relationship>

2 ° ≤α≤15 °, 16 ° ≤β≤80 °, 0.4 * P≤c≤0.6 * P

Here, P denotes a tire running direction length for one block, c denotes one side length of the triangular groove, and α and β denote both end angles of the triangular groove.

If α <2 ° or β <16 °, water runs out during rain driving, and the driving performance of rain road is improved, but tire durability is deteriorated due to stones stuck while driving on unpaved road, and each block if α> 15 ° or β> 80 ° It is not preferable because the rigidity of the tire is reduced and the flow of each block increases during driving, and uneven wear of the tire occurs.

If c <0.4 * P is a problem that the tire durability is deteriorated due to the pinch when running on the unpaved road, c> 0.6 * P is preferred because the rigidity of each block is reduced and the flow of each block is increased during driving, the tire wear wear occurs I can't.

In addition, the present invention is characterized in that a plurality of anti-twisting tool is installed in the center bell.

In addition, the present invention is characterized in that the anti-jamming tool satisfies the following relational expression.

<Relationship>

0.1D≤h≤0.3D, 0.19W≤L≤0.38W

Here, h is the height of the pinch prevention tool, L is the tire running direction length of the pinch prevention tool, D is the depth of the center longitudinal groove, W is the width of the center longitudinal groove.

If h <0.1D, the durability of the tire due to instantaneous crushing while driving is reduced, and if h> 0.3D, it is advantageous to improve the durability of the tire due to instantaneous crushing while driving, Not only is the mileage performance deteriorated when is protruded, but also the braking force by the pinch prevention tool is lowered, which is not preferable.

If L <0.19W, the durability of the tire due to instantaneous crushing while driving is lowered. If L> 0.38W, the braking force is lowered when the crushing prevention protrusion protrudes at the end of the driving, which is not preferable.

In addition, the present invention is a first fine groove applied in the tire running direction in the center block and the center-shoulder block, and a width of the tire in the plurality of second fine grooves and the shoulder block applied in the tire width direction in the center block and the center-shoulder block. And a third micro groove applied in the direction.

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

2 is a plan view of a pattern of a pneumatic radial tire for a heavy load according to an embodiment of the present invention.

Referring to Figure 2, the tread portion of the heavy-load pneumatic radial tire of the present invention has a five-ribbed pattern consisting of a groove and a block partitioned by the groove.

Here, the "5-rib pattern" means that five ribs (blocks) are formed in the tire running direction.

The groove includes a center longitudinal groove G1 applied in the circumferential direction (driving direction) of the tire and formed at the center portion of the tread, and a shoulder longitudinal groove G2 formed at the shoulder portion of the tread.

The block includes a center block B3 formed at the center of the tread, a shoulder block B1 and B5 formed at the shoulder of the tread, and one or more centers formed between the center block B3 and the shoulder blocks B1 and B5. Shoulder blocks B2 and B4.

The center block B3 is preferably located on the centerline of the tread portion.

The present invention is characterized in that a triangular groove is formed on both sides of the tread pattern block made as described above.

The triangle groove is preferably not formed on the shoulder line side of the shoulder block. The reason is that if the triangular groove is formed on the shoulder line side, it is difficult to expect the effect of the present invention, and rather it is not preferable because disadvantages such as tearing of the shoulder part occur.

Detailed description of the triangular groove will be described in the description of FIG.

In addition, the present invention is characterized in that a plurality of anti-twisting tool (S) is installed in the center bell.

Detailed description of the anti-twisting tool (S) will be described later in FIGS. 4 and 5.

In addition, in the present invention, it is preferable that a plurality of fine grooves are applied in each block.

That is, according to the present invention, the first fine groove Gr1, the center block B3, and the center-shoulder blocks B2 and B4 are applied in the tire driving direction in the center block B3 and the center-shoulder blocks B2 and B4. The plurality of second fine grooves Gr2 applied in the tire width direction therein and the third fine grooves Gr3 applied in the width direction of the tire in the shoulder blocks B1 and B5 are included.

As described above, the present invention can effectively exhibit the appearance quality and the braking force and the driving force at the beginning of the driving by applying a fine groove in the block.

Next, the specification of the triangle groove will be described in more detail with reference to FIG. 3.

3 is an enlarged view of a portion where the triangular groove of FIG. 2 is formed.

Referring to FIG. 3, the triangular groove according to the present invention has one side length (c) of 0.4 to 0.6 times the tire driving direction length (P) for one block, and the size (α) (β) of each end angle is 2, respectively. It is preferable that they are -15 degrees and 16-80 degrees.

Here, 'the tire running direction length for one block' indicates the length in the longitudinal direction in the unit block, and consists of the sum of the length b and the length c.

If the one side length c of the triangular groove is less than 0.4 times the length of the tire driving direction P for one block, a problem arises that the tire endurance is deteriorated when the unpacked driving is carried out, and the one side length c of the triangular groove is If is greater than 0.6 times the tire driving direction length (P) for one block is not preferable because the rigidity of each block is reduced and the flow of each block is increased during driving, uneven wear of the tire occurs.

In addition, if the size (α) (β) of the two end angles in the triangular groove is formed less than 2 °, 16 °, respectively, the water runs out well when driving on rain road improves the driving performance of rain road, but the tire durability is stuck when driving on the dirt road When the size (α) (β) of both end angles in the triangular groove is formed to exceed 15 ° and 80 °, respectively, the rigidity of each block decreases and the flow of each block increases during driving, which leads to uneven wear of the tire. Can not do it.

As described above, the present invention by forming a triangular groove on both sides of the block to suppress the crushing can improve the durability and braking force, driving force performance of the tire.

Next, in the present specification, the specification of the anti-twisting tool will be described in more detail with reference to FIGS. 4 and 5.

4 is a cross-sectional view of the tire longitudinal direction of the center bell of FIG. 2, and FIG. 5 is a cross-sectional view of the tire longitudinal direction of the center longitudinal of FIG.

As shown in Figures 4 and 5, the anti-twist tool (S) of the present invention is characterized by satisfying the following relationship.

<Relationship>

0.1D≤h≤0.3D, 0.19W≤L≤0.38W

Here, h is the height of the pinch prevention tool, L is the tire running direction length of the pinch prevention tool, D is the depth of the center longitudinal groove, W is the width of the center longitudinal groove.

If h <0.1D, the durability of the tire due to instantaneous crushing while driving is reduced, and if h> 0.3D, it is advantageous to improve the durability of the tire due to instantaneous crushing while driving, When not protruded, not only the mileage performance is lowered but also the braking force by the anti-twisting tool (S) is not preferable.

If L <0.19W, the durability of the tire due to instantaneous crushing while driving decreases, and if L> 0.38W, the braking force is lowered when the crushing prevention tool S protrudes at the end of the driving, which is not preferable.

As described above, according to the present invention, by forming triangular grooves on both side surfaces of the block, and installing a squeeze prevention tool or the like in the center groove, crushing during running can be effectively suppressed, and rain driving performance can be improved. Accordingly, the present invention can improve the durability of the tire.

1 is a plan view of a pattern of a pneumatic radial tire for a heavy load according to a conventional embodiment.

2 is a plan view of a pattern of a pneumatic radial tire for a heavy load according to an embodiment of the present invention.

3 is an enlarged view of a portion where the triangular groove of FIG. 2 is formed.

It is sectional drawing about the tire width direction of the center seedling of FIG.

FIG. 5 is a cross-sectional view of a tire driving direction of the center bell of FIG. 2.

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

C / L (Center Line): Circumferential direction of tire (tire direction)

B1, B5: shoulder block B2, B4: center-shoulder block

B3: center block G1: center groove

G2: Shoulder Groove

P: Length of tire running direction for one block

c: One side length of triangular groove α, β: Both end angles of triangular groove

L: Tire running direction length of the anti-twist tool h: Height of the chuck-proof tool

D: depth of center longitudinal groove W: width of center longitudinal groove

S: Stone Block

Claims (4)

A center longitudinal groove applied in the circumferential direction of the tire and formed at the center portion of the tread, a shoulder longitudinal groove formed at the shoulder portion of the tread, and defined by the center longitudinal groove and the shoulder longitudinal groove and at the center portion of the tread. In a heavy-loaded pneumatic radial tire having a formed center block, a tread portion including a shoulder block formed at a shoulder portion and a center-shoulder block formed between a center block and a shoulder block, triangular grooves are formed on both sides of all the blocks. And a pneumatic radial tire for a heavy load, characterized by satisfying the following relational expression. <Relationship> 2 ° ≤α≤15 °, 16 ° ≤β≤80 °, 0.4 * P≤c≤0.6 * P Here, P denotes a tire running direction length for one block, c denotes one side length of the triangular groove, and α and β denote both end angles of the triangular groove. 2. The heavy-duty pneumatic radial tire according to claim 1, wherein a plurality of anti-knuckles are provided in the center bell. The pneumatic radial tire for a heavy load according to claim 2, wherein the anti-twist tool satisfies the following relational expression. <Relationship> 0.1D≤h≤0.3D, 0.19W≤L≤0.38W Here, h is the height of the pinch prevention tool, L is the tire running direction length of the pinch prevention tool, D is the depth of the center longitudinal groove, W is the width of the center longitudinal groove. 4. The first micro groove according to any one of claims 1 to 3, wherein the first micro groove is applied in the tire driving direction in the center block and the center-shoulder block, and the plurality of second applied in the tire width direction in the center block and the center-shoulder block. A heavy-loaded pneumatic radial tire, comprising a third groove in the width direction of the tire in the fine groove and the shoulder block.