KR100737899B1 - Pneumatic vehicle tire - Google Patents

Abstract

A pneumatic tire for a vehicle is provided to increase the strength of a small block and lower the strength of a large block to reduce the strength difference between the blocks, thereby minimizing an irregular abrasion phenomenon. A pneumatic tire for a vehicle includes a tread(1), a sidewall, and a bead. The tread includes a block and a groove. The outer blocks of the tread(1) are classified large blocks, middle blocks(22), and small blocks(21). A protrusion is formed from a groove wall at the side of the small block(21) in a groove between the small block(21) and the middle block(22). A recess is formed at a groove wall at the side of the large block in a groove between the middle block and the large block. The protrusion has the same curvature as the circle of a radius in the range of 5 mm to 15 mm.

Description

Pneumatic vehicle tire

1 is a plan view of main parts of a tire for a vehicle in which each size of the tread outer block is divided into three stages of public interest;

2 is a cross-sectional view of a conventional vehicle tire groove.

3 is a cross-sectional view of the vehicle tire groove of the present invention.

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

1. Tread

2. Block

21.Small Block 22.Middle Block 23.Large Block

3. Groove

31.groove 311.protrusions

32. Grooves 321. Recesses

The present invention relates to improvements in grooves and blocks of pneumatic tires for vehicles.

As consumer demand for tires increases, the importance of noise suppression is emerging in addition to basic driving, braking and handling performance.

As a conventional technique for reducing noise, as shown in Figure 1, by forming the size of the outer block of the tread in three stages of small and large, by resonating the pitch size between the blocks in three stages of the large and small according to the size of the block Techniques for reducing noise by the known are known. This technology has the advantage that a certain level of noise suppression effect can be expected without additional components such as the application of a porous material for the separate sound-absorbing holes or flaws formed in the block or groove. In addition, as in Patent Registration No. 10-0546440, a technique for obtaining an improved noise suppression effect has been introduced when the arrangement of the small and medium blocks meets specific conditions.

In the tread structure in which the size of the block and the pitch is adjusted as shown in FIG. 2, the slope a with respect to the vertical plane of the groove wall on the smaller side of the block 101 is larger than the larger block 100. It is common to form 5-10 degree larger than the inclination (b) with respect to the vertical surface of the groove side wall.

However, in the conventional tire configured as described above, since the small block has a relatively low rigidity and the large block has a relatively strong rigidity, non-uniform wear occurs due to the difference, and thus a continuous noise suppression effect cannot be expected. Since the volume of the grooves becomes relatively small, the running performance on the wet road surface is reduced, and the width of the bottom surface of the groove section is narrowed, thereby increasing the possibility of cracking of the grooves during driving.

Thus, the present invention forms a convex protrusion on the small block side groove wall of the groove formed by the small block and the medium block, and a concave depression is formed on the large block side groove wall of the groove formed by the heavy block and the medium block, thereby providing rigidity between the blocks. The purpose of the present invention is to provide a pneumatic tire for a vehicle that minimizes uneven wear by maintaining a difference, maintains the volume of the groove even after heavy wear, and secures the width of the groove bottom to prevent cracking.

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

The present invention consists of a tread 1, a sidewall (not shown) and a bead portion (not shown), a block 2 and a groove 3 are formed in the tread 1, and the tread ( In the size of each of the outer blocks of 1) divided into three stages of small and medium, the convex protrusions 311 on the groove wall on the small block 21 side of the groove 31 formed by the small block 21 and the heavy block 22. ), And a concave depression 321 is formed in the groove wall of the large block 23 side of the groove 32 formed by the heavy block 22 and the large block 23.

The protrusion 311 preferably has a curvature such as a circle having a radius of 5-15 mm in a range of a contact point p2 spaced apart by a height of 1-2 mm from the contact p1 between the groove and the ground. This configuration not only increases the total volume of the small block, but also enhances the resistance of the small block to driving force during driving. Further, in order to secure the area of the groove bottom after the wear period, the curved portion r2 below the point p2 is preferably formed to have a curvature of 100-200% lower than the curved portion r1 in the direction of the heavy block 22. Do.

The depression 321 preferably has a curvature such as a circle having a radius of 5-15 mm in a range of a contact point p4 spaced apart by a height of 1-2 mm vertically from the contact p3 of the groove and the ground. This configuration not only reduces the overall volume of the large block, but also weakens the resistance of the large block to the direction of the driving force during driving, thereby reducing the rigidity somewhat. As in the previous case, in order to secure the area of the groove bottom after the wear period, the curved portion r4 below the point p4 has a curvature of 100-200% lower than the curved portion r3 in the middle block 22 direction. It is preferable.

As described above, according to the present invention, the stiffness of the small block is increased, the stiffness of the large block is reduced to minimize the non-uniform wear phenomenon by alleviating the stiffness difference between the blocks, thereby maintaining the continuous noise suppression performance, even after the middle of wear Maintaining the volume of the grooves prevents performance degradation on wet roads, and secures the width of the groove bottoms to prevent cracking.

Claims (3)

It is composed of tread, sidewall and bead, and blocks and grooves are formed in the tread, and the small block side grooves of the grooves formed by the small block and the heavy block are formed in the size of each of the outer blocks of the tread in three stages A pneumatic tire for a vehicle, wherein a convex protrusion is formed on a wall, and a concave depression is formed on a large block side groove wall of a groove formed by a heavy block and a large block. 2. The pneumatic tire for a vehicle according to claim 1, wherein the protrusion has a curvature such as a circle having a radius of 5 to 15 mm. 2. The pneumatic tire for a vehicle according to claim 1, wherein the depression has a curvature such as a circle having a radius of 5 to 15 mm.

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