KR20040095473A - Heavy duty tire with stone ejector grooves - Google Patents

Abstract

PURPOSE: A heavy duty tire with a stone ejector groove is provided to effectively prevent stones from being held in the tire. CONSTITUTION: In a heavy duty tire with a stone ejector groove(10), a protrusion(20) having two radiuses of curvature(R1,R2) is formed to a wall of one side of the stone ejector groove. A protrusion(20') formed point-symmetrically to the protrusion of the wall of one side of the groove around a point of the central line of the groove is formed to a wall of the other side of the groove. The small one of the radiuses of curvature of the protrusions has a range of 4¯6 mm. A protruded bar(30) is formed to the bottom of the groove.

Description

HEAVY DUTY TIRE WITH STONE EJECTOR GROOVES}

The present invention relates to a heavy load tire provided with a stone ejector groove.

Grooves are formed in the tread portion of a conventional tire to maintain braking performance and drainage performance while driving a vehicle.

However, when a heavy-duty vehicle such as a dump truck travels on a section of paved and unpaved roads or a section of unpaved roads, stones or foreign substances are caught between both sidewalls of the tire groove (hereinafter referred to as "stones"). Frequently occurred. If the tire groove continues to run without removing it, the bottom of the groove wears out, and if the wear of the groove deteriorates, the top belt is damaged and the separation from the tread ( Separation) occurred.

Moreover, if a separation occurred while driving, the tire tread could come off and lead to a large accident.

Conventionally, in order to solve this problem, the structure of various tire grooves of the improved form has been proposed. 1 (a) to 1 (e) show some structures of tire grooves known as such improved structures.

The groove shown in FIG. 1 (a) is the most commonly adopted stone ejector structure, which forms a protrusion bar 30 on the bottom surface of the groove 10 to form a space in the vertical direction in which foreign matter can enter. It is intended to be reduced.

The groove shown in Fig. 1 (b) shows a structure that prevents the sticking phenomenon and facilitates the release of stones by varying the inclination angle of both side walls of the groove. At this time, as shown in Fig. 1 (c), if the protrusion bar is formed on the bottom of the groove, the effect is higher.

The groove shown in FIG. 1 (d) has a structure in which the inclinations of both side walls of the groove are formed in two stages, respectively, and the inclination angle of the surface side with respect to the centerline of the groove is larger than the bottom inclination angle. Of course, forming a protruding bar at the bottom of the groove makes the effect even higher.

As another example, the groove shown in FIG. 1 (e) is formed in the shape of the groove sidewall inclined shape not in a straight line but in a convex curvature inward.

However, in the conventional groove having the above-described configuration, since the inner wall of the groove is smooth, the stone is easy to be nailed once, and the once stuck stone is hardly pulled out by the elasticity of both side walls of the groove, so that the effect of preventing phenomenon is very low. Not satisfactory.

The present invention has been made to solve the above problems, an object of the present invention is to provide a heavy-duty tire having a stone ejector groove that can effectively prevent the phenomenon of running during driving.

1 (a) to 1 (e) are cross-sectional views showing the groove structure of a conventional tire.

2 is a cross-sectional view showing a groove structure of a tire according to an embodiment of the present invention.

3 is a cross-sectional view showing a groove structure of a tire according to another embodiment of the present invention.

4 is a cross-sectional view showing a groove structure of a tire according to still another embodiment of the present invention.

※ Explanation of Major Drawings

10 ... Groove

20,20 '... overhang

30 ... protrusion bar

40,40 '... turning

R1, R2 ... projecting radius

RS ... turning radius

In order to achieve the above object, in the heavy-duty tire provided with the stone ejector groove according to the present invention, a protrusion having two radiuses of curvature is formed on one side wall of the groove, and the groove is formed on the other side wall opposite thereto. With respect to the point in the centerline of the, characterized in that the protrusion formed on the one side wall and the protrusion formed symmetrically.

At this time, it is preferable that the small radius of curvature of the two radiuses of curvature of the protrusions has a range of 4 to 6 mm.

Furthermore, it is preferable that a protrusion bar is formed at the bottom of the groove.

According to another aspect of the heavy-duty tire provided with the stone ejector groove according to the present invention, two to three protrusions are formed on one side wall of the groove, and two to three protrusions are formed on the other side wall facing the groove. It features.

It is preferable that the protrusion of the said one side wall and the protrusion of the other side wall are alternately formed with respect to the centerline of the groove.

On the other hand, the projection formed on the side wall of the groove, it can be connected to the neighboring projection by a smooth curve.

Moreover, the said processus | protrusion is hemispherical, It is preferable that the radius has a range of 1.5-2 mm.

Moreover, it is effective that a protrusion bar is formed at the bottom of the groove.

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

Example 1

FIG. 2 shows a heavy duty tire with a stone ejector groove according to Embodiment 1 of the present invention.

As shown, a protrusion 20 having two radiuses of curvature R1 and R2 is formed on one side wall of the groove 10, and on the other side wall facing the one side wall, the center line of the groove 10 is formed. A protrusion 20 'formed symmetrically with the protrusion 20 of the one side wall is formed with respect to the present point. That is, the protrusions 20 and 20 'are not symmetrical with respect to the center line but are formed symmetrically with respect to the point on the center line, so that the protrusions are very difficult to pinch.

The two radiuses of curvature forming the protrusions 20 and 20 'are different in size, but are preferably connected smoothly at their interfaces.

The small radius of curvature R1 of the radius of curvature has a range of 4 to 6 mm. When the radius of curvature is too small, the protruding height is small and easy to pinch stones. When the radius of curvature is excessively large, the inlet of the groove 10 may be blocked, which may cause a problem in drainage performance.

Moreover, if the protrusion bar 30 is formed at the bottom of the groove 10, it is more effective in preventing the protrusion.

Example 2

3 shows the configuration of the tire groove according to the second embodiment of the present invention.

As shown, two protrusions 40 are formed on one side wall of the groove 10, and two protrusions 40 ′ are formed on the other side wall facing the groove 10. The protrusion 40 may be formed up to about three. This is because, when more than three, the effect is not further improved to prevent the roughening, and only the drainage performance is deteriorated.

The protrusions 40 on one side wall and the protrusions 40 'on the other side wall are effectively formed in an up-down direction with respect to the center line of the groove 10 to prevent roughness.

And, it is advantageous in terms of durability that the protrusion 40 is hemispherical. At this time, the radius (RS) of the protrusion 40 is preferably in the range of 1.5 ~ 2mm. This is because, when the radius (RS) of the projection 40 is too small, less anti-splashing effect, if excessively large, the drainage performance deteriorates.

In addition, the protrusion bar 30 is formed at the bottom of the groove 10 is more effective in preventing the stone.

Example 3

4 shows a configuration of the tire groove according to the third embodiment of the present invention.

As shown, the present embodiment is substantially similar to the second embodiment, and the projections 40 and 40 'formed on the sidewall of the groove 10 are connected to neighboring projections 40 and 40' by a smooth curve. have.

Such a configuration can be applied when the durability of the projections 40 and 40 'is further needed.

According to the present invention having the configuration described above, since irregular protrusions are formed on the sidewalls of the grooves, there is an advantage that the phenomenon of running during driving can be more effectively prevented.

Claims (10)

A heavy duty tire equipped with a Stone Ejector Groove, On one side wall of the groove 10 is formed a projection 20 having two radiuses of curvature R1 and R2, and on the other side wall opposite thereto, a point on the center line of the groove 10. The heavy-duty tire provided with the stone ejector groove characterized by the above-mentioned protrusion part 20 'formed in the point symmetry with the protrusion part 20 of the said one side wall. The method of claim 1, The small curvature radius (R1) of the two curvature radii of the protrusions (20, 20 ') has a stone ejector groove, characterized in that the range of 4 to 6mm. The method according to claim 1 or 2, A heavy load tire having a stone ejector groove, characterized in that a protrusion bar 30 is formed at the bottom of the groove 10. In the heavy duty tire provided with a stone ejector groove, Stone ejector grooves, characterized in that two to three protrusions 40 are formed on one side wall of the groove 10, and two to three protrusions 40 'are formed on the other side wall facing the groove 10, respectively. Heavy duty tires. The method of claim 4, wherein The heavy load tire having a stone ejector groove, wherein the protrusion 40 on the one side wall and the protrusion 40 'on the other side are alternately formed with respect to the center line of the groove 10. The method according to claim 4 or 5, The projections (40, 40 ') formed on the side wall of the groove (10) is a heavy load tire having a stone ejector groove, characterized in that connected to the adjacent projections (40, 40') by a smooth curve. The method according to claim 4 or 5, The projection 40 has a hemispherical shape, the radius (RS) is a heavy-loaded tire having a stone ejector groove, characterized in that it has a range of 1.5 ~ 2mm. The method of claim 6, The projection 40 has a hemispherical shape, the radius (RS) is a heavy-loaded tire having a stone ejector groove, characterized in that it has a range of 1.5 ~ 2mm. The method according to claim 4 or 5, A heavy load tire having a stone ejector groove, characterized in that a protrusion bar 30 is formed at the bottom of the groove 10. The method of claim 6, A heavy load tire having a stone ejector groove, characterized in that a protrusion bar 30 is formed at the bottom of the groove 10.