KR20130085690A

KR20130085690A - Pneumatic tire for vehicle

Info

Publication number: KR20130085690A
Application number: KR1020120006647A
Authority: KR
Inventors: 이동하
Original assignee: 금호타이어 주식회사
Priority date: 2012-01-20
Filing date: 2012-01-20
Publication date: 2013-07-30

Abstract

The present invention discloses a pneumatic tire for automobiles.
Automotive pneumatic tire according to the present invention is a pneumatic tire for automobile provided with blocks, grooves and tie bars of the tread portion or the shoulder portion in order to reduce noise, improve driving stability or driver's handling performance, the tie bar is a groove Protruding to have a lower height (H1), wherein at least one side portion extending from the groove has an inclined surface, the region where the inclined surface meets the upper surface has a certain curvature, thereby grooves on the tire Reduce the stiffness difference between the blocks on the left and right, and maximize drainage performance on wet roads.

Description

Pneumatic tire for vehicle

The present invention relates to a pneumatic tire for automobiles, and more particularly to a pneumatic tire for automobiles that can reduce the stiffness difference between the blocks located on the left and right grooves on the tire, and maximize the drainage performance on wet road surface.

In general, a pneumatic tire for automobiles is appropriately arranged in the size and position of the block and groove of the tread portion or the shoulder portion of the tire in consideration of drainage performance, noise and handling performance in the rain, so that the performance is harmonized.

For this reason, grooves on a tire disposed cause a difference in stiffness between blocks located on the left and right sides of the groove, and the difference in stiffness causes a difference in wear of the blocks located before and after the groove, which is commonly referred to as step wear or heel toe. Toe) Wear is called.

The height difference between the blocks caused by the stepped road may cause noise, which may cause discomfort to the driver.

In order to solve this problem, the structure is installed between the grooves in the form of tie-bars to block a portion of the cross-section to reduce the stiffness difference between the front and rear blocks.

The tie bar installed in the conventional tire has a partial cross section of the groove while reducing the stiffness difference between the blocks before and after the groove, thereby reducing the step wear. However, the tie bar reduces the drainage capacity of the groove. In addition, hydroplaning may occur in rain due to a reduced drainage capacity.

If hydro hydroplaning occurs, it may cause a danger when driving on a rainy road, and it is necessary to develop a tire that can prevent step wear without reducing drainage performance.

In the same context, the Republic of Korea Patent No. 798977 has the shape of the tie bar in the X-shape, the height step of the tie bar start surface and end to prevent the reduction of drainage performance.

However, this means that the angle of the direction of water flow is set close to 90 degrees, so when the drainage is substantially drained, a vortex occurs at the point where the tie bar meets the groove cross-section, so that the water flow is not desired and the drainage performance may be degraded. There was a problem.

In addition, in the Republic of Korea Patent Publication No. 10-2010-0053146, the tie bar is formed high on one side and low on one side, so that the neighboring tie bar between the neighboring tie bars in the groove are installed to cross each other, but this is also the occurrence of vortex As a result, the drainage performance was lowered.

The technical problem to be solved by the present invention is to provide a pneumatic tire that can reduce the stiffness difference between the blocks located on the left and right grooves on the tire, and maximize the drainage performance on wet road surface.

In order to solve the above technical problem, in order to solve the above-mentioned technical problem, in the pneumatic tire for automobiles provided with blocks, grooves and tie bars of a tread part or a shoulder part in order to reduce noise, improve driving stability and driver's handling performance, Protrudes to have a height (H1) lower than the groove, at least one side portion extending from the groove has an inclined surface, the area where the inclined surface meets the top surface has a curvature of the automobile to provide.

According to an embodiment of the present invention, the height H1 may be greater than or equal to 0.2 times and less than or equal to 0.7 times the groove depth H.

According to another embodiment of the present invention, an area where the inclined surface and the bottom surface of the groove contact each other may be provided to have a predetermined curvature.

According to another embodiment of the present invention, the predetermined curvature R may be greater than or equal to 0.5 times the tie bar height H1 and less than or equal to the height of the tie bar.

According to another embodiment of the present invention, the inclined surface length ×

May be greater than or equal to 0.5 times the tie bar height H1 and less than or equal to 1.5 times the tie bar height.

According to the pneumatic tire according to the present invention, it is possible to reduce the stiffness difference between the blocks located on the right and left grooves on the tire, and to maximize the drainage performance on the wet road surface.

1 is a view showing a part of the tread portion having a tie bar according to the present invention,
FIG. 2 is a cross-sectional view taken along the AA cut line of FIG. 1. FIG.

Hereinafter, the present invention will be described with reference to the accompanying drawings, examples of which are feasible, but only by way of example. It will be appreciated that embodiments are possible. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

First, the pneumatic tire for a vehicle according to the present invention is a vehicle pneumatic tire provided with a block, groove, and tie bar of a tread part or a shoulder part in order to reduce noise, improve driving stability, and improve driver's handling performance. Is projected to have a height (H1) lower than the groove, at least one side portion extending from the groove has an inclined surface, the region where the inclined surface meets the top surface is characterized in that it has a certain curvature.

In detail with reference to the accompanying drawings, see Figs.

1 is a view showing a part of the tread having a tie bar according to the present invention, Figure 2 is a cross-sectional view taken along the AA incision line of Figure 1, wherein the trough groove 100 is formed to extend intaglio Blocks 110 and 110 ′ divided by the grooves 100 are arranged in a derived shape, and protruded in the form of connecting portions of both blocks lower than the height of the blocks 110 and 110 ′. The tie bar 120 can be seen.

The depth H in which the groove 100 is formed is the same as the height of the blocks 110 and 110 ′, and the groove 100 may be more clearly understood as a groove word in English.

The tie bar 120 protrudes to have a height H1 lower than that of the groove 100, and at least one side portion 121 and 121 ′ extending from the groove 100 has an inclined surface, and the inclined surface is an upper surface. The region that meets 122 has a constant curvature R.

The height H1 may be greater than or equal to 0.2 times the groove depth H and less than or equal to 0.7 times the height H1 is 0.2 of the groove depth H. If less than twice, the problem caused by the difference in stiffness of the blocks (110, 110 ') It is difficult to solve and, on the contrary, if it exceeds 0.7 times, drainage capacity may be lowered.

The area where the inclined surface and the bottom surface of the groove contact each other may be provided to have a predetermined curvature, which is to prevent the generation of vortices while water flows in the groove according to the installation of the tie bar. Swirl in the opposite direction to the main stream is best observed behind rocks protruding from fast-flowing rivers. In order to prevent such vortices, it is desirable to have a streamline close to the laminar flow that can occur. .

Furthermore, the constant curvature R may be greater than or equal to 0.5 times the tie bar height H1 and less than or equal to the height of the tie bar, if the constant curvature R is the tie bar height. If less than 0.5 times (H1), the portion connecting the tie bar and the groove bottom and the top may not be sufficiently streamlined to effectively prevent the generation of vortex, and the constant curvature R may be determined by the tie bar height ( If H1) is exceeded, the size of the tie bar may be reduced, which may cause a problem in that it is not possible to effectively prevent step wear.

On the other hand, the inclined surface length ×

Is greater than or equal to 0.5 times the tie bar height H1, and may be less than or equal to 1.5 times the tie bar height, if the inclined surface length x

If less than 0.5 times the height of the tie bar (H1), the inclination angle of the tie bar is large, the flow of water in the grooves do not want to cause a problem that can cause vortex, on the contrary exceeds 1.5 times the tie bar height In this case, a problem may occur in that the cross-sectional area of the groove is reduced to reduce the drainage capacity. Therefore, the angle θ of the groove inclined surface is preferably located within 33.7 degrees to 63.4 degrees.

Groove 100, Block 110, 110 '
Tie bar 120, depth H, H1
Curvature R, one side 121, 121 '
Top side 122

Claims

In pneumatic tires for automobiles provided with tread or shoulder blocks, grooves, and tie bars to reduce noise, improve driving stability, and improve driver handling performance,
The tie bar protrudes to have a height H1 lower than that of the groove, and at least one side portion extending from the groove has an inclined surface, and the area where the inclined surface meets the upper surface has a predetermined curvature. Mouth tire.

The method of claim 1,
The height (H1) is a pneumatic tire for a vehicle, characterized in that greater than or equal to 0.2 times the groove depth (H), less than or equal to 0.7 times.

The method of claim 1,
The area in which the inclined surface and the bottom surface of the groove contact each other is provided with a pneumatic tire for a vehicle having a predetermined curvature.

The method according to any one of claims 1 to 3,
The predetermined curvature R is greater than or equal to 0.5 times the tie bar height (H1), less than or equal to the height of the tie bar, pneumatic tire for a vehicle.

The method of claim 1,
The inclined length ×

Is greater than or equal to 0.5 times the tie bar height H1, and less than or equal to 1.5 times the tie bar height.