KR20170088547A

KR20170088547A - Tire

Info

Publication number: KR20170088547A
Application number: KR1020160008541A
Authority: KR
Inventors: 김영진
Original assignee: 한국타이어 주식회사
Priority date: 2016-01-25
Filing date: 2016-01-25
Publication date: 2017-08-02
Also published as: KR101768912B1

Abstract

The tire of the present invention comprises a plurality of tread blocks, grooves formed between the tread blocks, and grooves formed on the bottom surface of the grooves, wherein the upper surface thereof is inclined at a predetermined angle with the bottom surface of the groove Shaped stone ejector.
The tire according to the present invention has the effect of preventing the stones put on the grooves from being easily removed while driving on the road, thereby preventing the durability of the tire caused by the stitching phenomenon from being lowered.

Description

Tire {TIRE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire, and more particularly, to a tire having a stone ejector for improving a phenomenon of stitching occurring in a groove of a tread.

Various grooves are formed in the tread which is the ground surface of the tire. In particular, in the case of heavy-duty tires such as dump trucks and cargo trucks, there are many cases where the tires run on unpaved roads as well as pavement roads. The stones embedded in the grooves pierce into the grooves during running to cause wear, and stress is exerted on the belts located under the grooves to cause separation of the belt and the tread, which adversely affects the durability of the tire.

In this case, a small-projection stone ejector formed on the bottom surface of the groove is provided to allow the stone stuck in the groove to be ejected. However, such a tire has a problem in that it can not effectively discharge stones stuck to the grooves due to the elasticity of the stone ejector rubber.

On the other hand, another prior art provides a tire in which projections are formed on both side walls of a groove to prevent large stones from being caught in the grooves. However, the protrusion of such a shape may deteriorate the drainage performance of the groove, and if the protrusion has a smaller diameter than the space between the protrusions, the protrusion may make the discharge more difficult.

Korean Patent Registration No. 10592991 Korean Patent Publication No. 2004-0043976

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tire capable of more easily discharging a stone stuck to a groove.

According to an aspect of the present invention, there is provided a tire including a plurality of tread blocks, a groove formed between the tread blocks, and a bottom surface of the groove, And a stone ejector having a shape tilted at a predetermined angle with respect to the base.

The stone ejector includes a first stone ejector having a shape tilted so as to form an acute angle with a first direction that is a width direction of the groove and a second stone ejector having a shape inclined to form an acute angle with a second direction opposite to the first direction can do.

Further, the first stone ejector and the second stone ejector may be alternately and repeatedly arranged on the bottom surface of the groove along the longitudinal direction of the groove.

The first stone ejector and the second stone ejector have a transverse length of 10 to 20% of the pitch length and may have a longitudinal length of 10 to 20% of the groove width.

The first stone ejector and the second stone ejector may be arranged at an interval formed by 5 to 15% of the pitch length.

In addition, the upper surface of the stone ejector may form an angle of 20 to 60 degrees with the bottom surface of the groove.

The tire according to the present invention has the effect of preventing the stones put on the grooves from being easily removed while driving on the road, thereby preventing the durability of the tire caused by the stitching phenomenon from being lowered.

1 is a partial perspective view of a tire according to an embodiment of the present invention.
2 is a plan view of Fig.
3 is a perspective view showing a modified example of the stone ejector.
4 is a front view showing the first stone ejector.
5 is a front view showing the second stone ejector.
Fig. 6 is a plan view of Fig. 3 (a).
7 is a schematic view for explaining the action of the tire according to the embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having ", and the like, specify that the presence of stated features, integers, steps, operations, elements, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless expressly defined herein Do not.

Hereinafter, a tire according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partial perspective view of a tire 100 according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a perspective view showing a modified example of a stone ejector. 1 and 2, a tire according to an embodiment of the present invention includes a plurality of tread blocks 10, a groove formed along the circumferential direction of the tire between the tread blocks 10, (20). In the present invention, only the circumferential grooves may be included, or both the circumferential grooves and the width grooves may be included. In the following description, the grooves 20 are formed in the circumferential direction, the longitudinal direction of the grooves means the circumferential direction of the tire, and the widths of the grooves 20 The direction means the width direction of the tire.

3, the tire according to the embodiment of the present invention includes a plurality of stone ejectors 30, 32 formed on the bottom surface 22 of the groove 20. As shown in Fig. The stone ejectors 30 and 32 serve to discharge stones out of the grooves 20 by transmitting the elastic force applied during traveling to the stones placed on the grooves 20. In the present embodiment, the upper surface of the stone ejectors 30, 32 has a shape inclined at a predetermined angle with the bottom surface 22 of the groove 20. [ At this time, the stone ejectors are divided into a first stone ejector 30 and a second stone ejector 32 according to their tilted directions.

The stone ejectors 30 and 32 may be formed in the shape of a polygonal column protruding from the bottom surface 22 of the groove 20 in a rectangular column in FIG. But the present invention is not limited thereto, and the cross section may be selected from various shapes such as polygonal, circular, oval, and the like.

4 and 5 show a front view of the first stone ejector 30 and the second stone ejector 32, respectively. As shown in Fig. 4, the first stone ejector 30 has a shape of an upper surface 34 which forms an acute angle with the first direction x, which is the width direction of the groove 20.

On the other hand, as shown in Fig. 5, the second stone ejector 32 has a shape of an upper surface 36 which forms an acute angle with a second direction opposite to the first direction x. At this time, it is preferable that the upper surfaces 34 and 36 of the stone ejectors 30 and 32 form an angle of 20 to 60 degrees with the bottom surface 22 of the groove 20, respectively. When the stone ejectors 30 and 32 are formed in a polygonal columnar shape, the upper surface is not parallel to the bottom surface of the groove 20 but has an inclined surface.

Preferably, the height h of the stone ejector, defined as the length of the short side of the two sides parallel to the trapezoidal frontal shape, is 10 to 20% of the depth of the groove 20. If the height of the stone ejector is greater than 20% of the depth of the groove 20, the drainage effect, which is the main function of the groove 20, is reduced and if the stone ejector height is less than 10% of the depth of the groove 20, Is weakened.

The first stone ejector 30 and the second stone ejector 32 are alternately and repeatedly arranged on the bottom surface 22 of the groove 20 along the longitudinal direction y of the groove 20 .

Fig. 6 is a plan view of Fig. 3 (a), and the arrangement and size of the stone ejectors 30 and 32 will be described below with reference to Fig. The first stone ejector 30 and the second stone ejector 32 have a transverse length a which is 10 to 20% of the pitch length p and the width 20 of the groove 20, (B) that is formed to 10 to 20% of the length (b). If the stone ejectors 30 and 32 are formed to be smaller than this range, the elastic force to bounce the stone is insufficient, and the stone ejector 30 , 32 are formed larger than this range, the drainage effect of the groove can be reduced. Here, the pitch length means the tire circumferential length in the tire circumferential direction of the repeating unit having the same pattern in the tire tread. Although the first stone ejector 30 and the second stone ejector 32 are formed to have the same size as each other in the drawing, the first stone ejector 30 and the second stone ejector 32 may have different sizes And a height. The distance c between the first stone ejector 30 and the second stone ejector 32 alternately arranged is preferably 5 to 15% of the pitch length. This is the range that minimizes striking and does not cause external damage to the tire even if small stones are encountered.

7 is a schematic view for explaining the action of the stone ejector according to the embodiment of the present invention. When the tread block contacts the road surface when the vehicle is running, the tread block is pressed against the load of the vehicle and the width of the groove 20 is widened. As the width of the groove 20 becomes wider, the elastic stone ejector 30 is bent in the width direction x of the groove 20.

Further, when the tread block does not contact the road surface, the width of the groove 20 becomes narrow, and the stone ejector 30 recovers its original shape by elasticity. As described above, the stone ejector 30 is repeatedly bent and deformed along the width direction of the groove 20. As the elastic force of the stone ejector 30 acts on the upper surface of the stone ejector 30 attached to the groove 20 so that the elastic force acts on the stone 40, ). &Lt; / RTI >

In addition, as described above, the stone ejectors whose tilted directions are opposite to each other in the tire according to the present embodiment are alternately repeatedly arranged along the longitudinal direction (y) of the groove, It is pushed along the longitudinal direction, that is, along the circumferential direction of the tire, and is repelled in the left and right direction on the upper surface of the alternately repeatedly arranged stone ejectors, and can be discharged to the outside. This is the same principle as if you pulled a nail embedded in a tree, it would be much easier to shake it from side to side in a vertical direction than to apply it in a vertical direction.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: Tire 10: Tread block
20: groove 22: groove bottom face
30, 32: Stone ejector 34, 36: Stone ejector top surface

Claims

A plurality of tread blocks;
A groove formed between the tread blocks; And
A stone ejector formed on a bottom surface of the groove and having an upper surface inclined at a predetermined angle with a bottom surface of the groove,
.

The method according to claim 1,
Wherein the stone ejector comprises:
A first stone ejector having a shape inclined at an acute angle with a first direction which is a width direction of the groove; And
A second stone ejector having a shape tilted at an acute angle with a second direction opposite to the first direction,
.

3. The method of claim 2,
Wherein the first stone ejector and the second stone ejector are alternately and repeatedly arranged on the bottom surface of the groove along the longitudinal direction of the groove.

The method of claim 3,
And the first stone ejector and the second stone ejector,
A tire having a transverse length formed by 10 to 20% of a pitch length and having a longitudinal length of 10 to 20% of the groove width.

The method of claim 3,
Wherein the first stone ejector and the second stone ejector are arranged at intervals of 5 to 15% of the pitch length.

The method according to claim 1,
The stone ejector
And a shape selected from a polygonal column, a circular column, and an elliptic column protruding from a bottom surface of the groove.

7. The method according to any one of claims 1 to 6,
And the upper surface of the stone ejector forms an angle of 20 to 60 degrees with the bottom surface of the groove.