KR20220098872A - Pneumatic tire to prevent mounting and demounting damage - Google Patents

Abstract

One embodiment of the present invention provides a technology for preventing cracks occurring on a bead unit by protecting the bead unit from an impact applied to the bead unit during mounting and demounting of a tire with respect to a rim. A heavy load pneumatic tire for preventing a damage during mounting and demounting according to an embodiment of the present invention comprises: a hump strip coupled to an outward part of the bead unit, which is one part of the tire in an outer direction, and an inward part of the bead unit, which is the other part of the tire in an inner direction, to prevent friction and impact between the bead unit and the rim where the tire is installed; protrusion units coupled to the inward part of the bead unit, having a curved outer surface facing the inside of the tire, and preventing cracks of the bead unit; and a T-bar formed in a bar shape between one protrusion unit and the other protrusion unit among the plurality of protrusion units to supplement stiffness of the protrusion units.

Description

Heavy-duty pneumatic tire that prevents mounting and detachment damage {PNEUMATIC TIRE TO PREVENT MOUNTING AND DEMOUNTING DAMAGE}

The present invention relates to a heavy-duty pneumatic tire that prevents mounting and detachment damage, and more particularly, to a crack generated in the bead by protecting the bead from the impact applied to the bead when the tire is mounted and detached from the rim. technology to prevent it.

The tire adopts a hump strip composed of high-hardness rubber on a part of the bead in the outer direction of the tire, so that parts such as carcass and chafer, which are the main skeleton of the tire, are combined with the tire. It is designed not to be damaged by friction or impact with the rim.

The hump strip, which performs the protective function as described above, is not only in contact with the rim, but also in the bead part in the direction inside the tire at a certain height to prevent damage by tools such as levers used when attaching and detaching the tire to the rim. It can be formed to wrap up to.

However, even if the hump strip is coupled to the bead as described above, when the tire is attached to and detached from the rim using a lever, internal damage (tear, tear) of the bead may occur due to misuse of work tools or incorrect work decoration. Problems that occur still exist, and moisture or air permeates from the corresponding site due to the damage to the bead portion, and cracks and separation may occur. Therefore, research and development to prevent such damage to the bead portion is continuing.

In Korean Patent Laid-Open Patent No. 10-2010-0060944 (Title of the Invention: Tire for heavy-duty vehicle made by improving the bead part), the bead is composed of the tread and the sidewalls on both sides of the tread and the bead part at the ends of both walls, and is in contact with the wheel. A tire for a heavy-duty vehicle made by improving the bead part is disclosed, wherein the bottom of the contact part of the part includes a bead heel, a bead sole and a bead toe, and a protrusion is formed on the bead toe.

Republic of Korea Patent Publication No. 10-2010-0060944

An object of the present invention for solving the above problems is to prevent cracks generated in the bead by protecting the bead from the impact applied to the bead when the tire is mounted and detached from the rim.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. There will be.

According to a configuration of the present invention for achieving the above object, in a tire including a bead portion, the bead portion is coupled to an outward portion that is one portion of the tire in an outward direction and an inward portion that is the other portion in the inner direction of the tire. , a hump strip for preventing friction and impact between the rim on which the tire is installed and the bead portion; a protrusion coupled to the inward portion of the bead portion, the outer surface facing the inside of the tire being formed as a curved surface, and preventing cracking of the bead portion; and a tee bar formed in a bar shape between one protrusion and the other protrusion of the plurality of protrusions to supplement the rigidity of the protrusion, wherein the plurality of protrusions are arranged to form a gap along the circumferential direction of the tire characterized.

In an embodiment of the present invention, in the cross-section of the bead portion, the height of the central point of the tee may be the same as the height (H) of the central point of the maximum thickness portion of the protrusion.

In an embodiment of the present invention, the width (h) of the tee bar may be 5 to 15 millimeters (mm).

In an embodiment of the present invention, the hump strip may include a turn-up portion that is turned up while surrounding the lower portion of the bead portion and is coupled to the inward portion of the bead portion.

In an embodiment of the present invention, the protrusion may be coupled to a surface of the inward portion of the bead portion and a surface of the turn-up portion.

In an embodiment of the present invention, in the cross-section of the bead portion, the height of the end of the turn-up portion may be the same as the height (H) of the center point of the maximum thickness portion of the protrusion.

In an embodiment of the present invention, in the cross-section of the bead portion, the height (H) of the center point of the maximum thickness portion of the protrusion may be 20 to 25 millimeters (mm).

In an embodiment of the present invention, the maximum thickness T of the protrusion may be 3 to 5 millimeters (mm).

In an embodiment of the present invention, the width W of the protrusion may be 10 to 15 millimeters (mm).

In an embodiment of the present invention, a distance G between the center point of one protrusion among the plurality of protrusions and the center point of the other protrusion may be 5 to 30 millimeters (mm).

The effect of the present invention according to the above configuration is that by forming the protrusion and the tee bar at the boundary between the end of the hump strip that protects the bead and the bead, cracks that may occur in the bead during the installation and detachment of the tire are formed in the protrusion. By doing so, it is possible to prevent damage to the bead portion in advance.

The effects of the present invention are not limited to the above effects, and it should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a schematic diagram for the separation of the bead portion and the rim according to the prior art.
2 is a schematic diagram of a portion of a tire according to an embodiment of the present invention.
3 is an enlarged view of a portion of a tire according to an embodiment of the present invention.
4 is a cross-sectional view of a bead portion according to an embodiment of the present invention.
5 is a perspective view of a protrusion according to an embodiment of the present invention.
6 is a perspective view and a cross-sectional view of a protrusion and a tee bar according to an embodiment of the present invention.
7 is a cross-sectional view of a bead portion of the prior art.
8 is a cross-sectional view of a bead portion according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be embodied in several different forms, and thus is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is "connected (connected, contacted, coupled)" with another part, it is not only "directly connected" but also "indirectly connected" with another member interposed therebetween. "Including cases where In addition, when a part "includes" a certain component, this means that other components may be further provided without excluding other components unless otherwise stated.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

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

1 is a schematic diagram for the separation of the bead portion 10 and the rim 30 according to the prior art. As shown in FIG. 1 , even when the bead part 10 is protected by the hump strip 20 , the operation of detaching the bead part 10 from the rim 30 using the lever 40 or the like is being performed. Damage such as cracks may occur in the bead portion 10, and there may still be a problem in that such cracks extend to main members such as carcass. The present invention may be devised to solve such a problem.

2 is a schematic diagram of a part of a tire according to an embodiment of the present invention, FIG. 3 is an enlarged view of a part of a tire according to an embodiment of the present invention, and FIG. 4 is an embodiment of the present invention It is a cross-sectional view of the bead portion 200 according to the.

5 is a perspective view of the protrusion 110 according to an embodiment of the present invention, and FIG. 6 is a perspective view and a cross-sectional view of the protrusion 110 and the tee bar 120 according to an embodiment of the present invention. Figure 6 (a) is an enlarged view of the cross-section of the protrusion 110 and the tee bar 120, Figure 6 (b) is the protrusion 110 and the tee bar which is the target of the enlarged view of Fig. 6 (a) (120) is a perspective view.

As shown in FIGS. 2 to 6 , in the tire of the present invention including the bead portion 200, the bead portion 200 has an outward portion which is one portion of the tire in the outward direction and an inward portion that is the other portion in the inner direction of the tire. A hump strip 300 (Humo Strip) that is coupled and prevents friction and impact between the rim 30 and the bead part 200 on which the tire is installed; a protrusion 110 coupled to the inward portion 220 of the bead portion, the outer surface facing the inside of the tire is formed in a curved surface, and preventing cracks c of the bead portion 200; and a tee bar 120 formed in a bar shape between one of the plurality of protrusions 110 and the other protrusion 110 to supplement the rigidity of the protrusion 110 .

As shown in FIG. 4 , the outward portion 210 of the bead portion means the left portion of the bead portion 200 in FIG. 4 , and the inward portion 220 of the bead portion is the right portion of the bead portion 200 in FIG. 4 . In other words, the lower portion 230 of the bead portion may be a portion including a bead hill, a bead sole, and a bead toe.

In order to prevent the crack c of the bead portion 200 as described above, the strength of the protrusion 110 may be greater than that of the rubber constituting the bead portion 200 .

The hump strip 300 may include a turn-up portion 310 that is turned up while surrounding the lower portion 230 of the bead portion and is coupled to the inward portion 220 of the bead portion. The hump strip 300 may be formed in a shape surrounding the outward portion 210 of the bead portion, the lower portion 230 of the bead portion, and the inward portion 220 of the bead portion, and the hump strip 300 is the outward portion 210 of the bead portion. The area surrounding the hump strip 300 may be formed to be larger than the area surrounding the inward portion 220 of the bead portion.

Accordingly, in the cross-section of the bead part 200 and the hump strip 300, the hump strip 300 may have a hook shape, and the other end of the hump strip 300 is coupled to the inward part 220 of the bead part. , that is, the end of the hook-shaped bead part 200 inwardly side may be the end of the turn-up part 310 .

The outer surface of the bead part 200 may be formed as a curved surface, and the contour line toward the inside of the tire in the cross-section of the bead part 200 may be formed as a smooth curve (A). And, as a surface corresponding to the outer surface of the bead portion 200, the inner surface of the bead portion 200, which is a surface coupled to the inward portion 220 and the turn-up portion 310 of the bead portion, is the inward portion 220 surface of the bead portion. and a shape corresponding to the surface of the turn-up portion 310 of the hump strip 300 .

Since the shape of the outer surface of the bead part 200 is formed as described above, the stress formed by the flexural extension of the bead part 200 may be easily dispersed in the inside of the protrusion part 110 . Accordingly, when a crack (c) occurs in the protrusion 110 due to the impact on the bead part 200 , the impact on the bead part 200 is dissipated by the protrusion part 110 , so that the bead part 200 . The occurrence of damage such as cracks (c) can be prevented.

The inward portion 220 of the bead portion and the turn-up portion 310 of the hump strip 300 are respectively coupled in separate configurations, and the strength of the hump strip 300 is formed to be relatively greater than the strength of the bead portion 200, When an impact occurs on the bead part 200 , the breakage of the bead part 200 may occur with a higher probability than other parts in the part of the bead part 200 adjacent to the end of the turn-up part 310 .

Therefore, as shown in FIGS. 4 and 5 , the protrusion 110 may be coupled to the surface of the inward portion 220 of the bead portion and the surface of the turn-up portion 310 . In addition, in the cross-section of the bead portion 200 , the height of the end of the turn-up portion 310 may be the same as the height H of the center point of the maximum thickness portion of the protrusion 110 .

In addition, in the cross-section of the bead part 200 , the height H of the center point of the maximum thickness portion of the protrusion part 110 may be 20 to 25 millimeters (mm). Here, the height may be a vertical distance from the surface that is parallel to the ground and passes through the end of the lower portion 230 of the bead. Hereinafter, it is the same.

Also, the height of the distal end of the turn-up portion 310 may be 20 to 25 millimeters (mm) corresponding to the height H of the central point of the maximum thickness portion of the protrusion 110 .

Accordingly, the protection function of the protrusion 110 can be maximized by protecting the most frequently damaged portion of the bead 200 by the maximum thickness of the protrusion 110 . In addition, by forming the protrusion 110 as described above, a tool such as a lever for mounting and detachment blocks unnecessary deep entry between the rim 30 and the bead part 200, and after the entry of the lever as described above As the protrusion 110 comes into contact with the lever, the contact angle between the lever and the hump strip 300 is reduced, thereby minimizing damage to the bead portion 200 .

And, the height (H) of the central point of the maximum thickness portion of the protrusion 110 and the height of the end of the turn-up portion 310 are numerically limited as described above, so that the hump strip 300 and the protrusion 110 make the bead portion ( 200), and at the same time, the weight of the hump strip 300 and the protrusion 110 is limited, thereby reducing the weight of the tire, thereby increasing the running performance of the tire.

The maximum thickness T of the protrusion 110 may be 3 to 5 millimeters (mm). When the maximum thickness T of the protrusion 110 is less than 3 millimeters (mm), the initial crack c passes through the protrusion 110 and is transferred to the bead 200 during mounting and detachment of the tire of the present invention. Damage to the unit 200 may occur. In addition, when the maximum thickness T of the protrusion 110 is more than 5 millimeters (mm), the thickness of the protrusion 110 is excessively thick and the deformation of the protrusion 110 is increased when the tire of the present invention is mounted and detached. The workability of desorption may be deteriorated.

The overall height of the protrusion 110 may be designed differently depending on the radius of the tire of the present invention, but the width W of the protrusion 110 may be 10 to 15 millimeters (mm). When the width W of the protrusion 110 is less than 10 millimeters (mm), the width W of the protrusion 110 becomes too small compared to the overall height of the protrusion 110, so that the crack c due to the protrusion 110 ) Not only the prevention effect is reduced, but also it is not easy to implement the above-described effect in which the angle of entry of the lever, etc. is reduced by the protrusion, so that the workability of the attachment and detachment may be reduced.

And, when the width W of the protrusion 110 is more than 15 millimeters (mm), heat generation at a portion of the tire in which the bead part 200 is formed increases due to an increase in the volume of the protrusion 110 , and the lever and the The width of the initial crack (c) (Initial Crack) and the growth width of the crack (c) can be increased by the same work tool.

The plurality of protrusions 110 may be arranged at intervals along the circumferential direction of the tire. And, the gap G between the protrusions 110, which is the distance G between the center point of one protrusion 110 and the center point of the other protrusion 110 among the plurality of protrusions 110, is 5 to 30 millimeters (mm) can be

When the gap G between the protrusions 110 is less than 5 millimeters (mm), the number of the protrusions 110 is excessive and the total volume of the protrusions 110 increases, thereby increasing the weight of the tire as well as the bead part 200 . Heat generation at a portion of the tire on which the is formed may increase, thereby reducing the durability of the tire. In addition, when the gap G between the protrusions 110 is less than 30 millimeters (mm), the gap G between the protrusions 110 is excessive and cracks c may occur between the protrusions 110 .

In the cross section of the bead part 200 , the height of the central point of the tee bar 120 may be the same as the height (H) of the central point of the maximum thickness portion of the protrusion 110 . Accordingly, the tee bar 120 is formed at the boundary between the end of the turn-up part 310 where the function of preventing the crack c by the hump strip 300 ends and the inward part 220 of the bead part, so that the protrusion 110 ) while maintaining an appropriate number, it is possible to prevent the occurrence of cracks (c) in areas that are not protected by the protrusion 110 .

The width h of the tea bar 120 may be 5 to 15 millimeters (mm). When the width (h) of the tea bar 120 is less than 5 millimeters (mm), the crack (c) occurrence prevention function for the bead portion 200 as described above may be reduced, and at the same time, the width of the tea bar 120 . (h) is too small, the manufacturing process of forming the tea bar 120 may not be easy.

In addition, when the width h of the tee bar 120 is more than 15 millimeters (mm), the volume of the tee bar 120 is increased to increase the volume of a portion of the tire in which the bead part 200 is formed, so that the volume of the corresponding part is increased. Heat may increase and workability may be deteriorated during installation and detachment.

7 is a cross-sectional view of the bead portion 10 of the prior art. And, FIG. 8 is a cross-sectional view of the bead part 200 according to an embodiment of the present invention. Specifically, (a) of FIG. 7 is a cross-sectional view of the bead portion 10 to which the protrusion 110 is not coupled, and (b) of FIG. 7 is an enlarged view of the lower portion of the bead portion. And, (a) of FIG. 8 is a cross-sectional view of the bead part 200 to which the protrusion 110 is coupled, and (b) of FIG. 8 is an enlarged view of the lower part 230 of the bead part.

As shown in FIG. 7 , when the protrusion 110 is not formed, a crack c is generated in the bead 10 during the tire mounting and detachment operation, and the crack c is formed inside the bead 10 . It can also grow as a major member of

On the other hand, as shown in FIG. 8 , when the protrusion 110 is formed, a crack c occurs in the protrusion 110 even if an impact occurs on the bead 200 during the tire mounting and detachment operation, and the protrusion 110 ) also suppresses the growth of such cracks (c), so that damage to the bead part 200 can be prevented.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and likewise components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

c: crack
10: bead part
20: hump strip
30: rim
40: lever
110: protrusion
120: Tiva
200: bead part
210: outward portion of the bead portion
220: inward portion of the bead portion
230: lower part of the bead part
300: hump strip
310: turn-up part

Claims (10)

In the tire comprising a bead portion,
a hump strip coupled to an outward portion of the bead portion, which is one portion of the tire in an outward direction, and an inward portion, which is the other portion in the inner direction of the tire, to prevent friction and impact between a rim on which the tire is installed and the bead portion;
a protrusion coupled to the inward portion of the bead portion, the outer surface facing the inside of the tire being formed as a curved surface, and preventing cracking of the bead portion; and
Includes; a tee bar formed in a bar shape between one of the plurality of protrusions and the other protrusion to complement the rigidity of the protrusion; and
Heavy-duty pneumatic tire for preventing mounting and detachment damage, characterized in that the plurality of protrusions are arranged at intervals along the circumferential direction of the tire.
The method according to claim 1,
In the cross section of the bead, the height of the central point of the tee bar is the same as the height (H) of the central point of the maximum thickness portion of the protrusion.
The method according to claim 1,
The width (h) of the tee bar is a heavy-duty pneumatic tire for preventing attachment and detachment damage, characterized in that it is 5 to 15 millimeters (mm).
The method according to claim 1,
The hump strip is a heavy-duty pneumatic tire for preventing attachment and detachment damage, characterized in that it has a turn-up portion that is turned up while surrounding the lower portion of the bead portion and is coupled to the inward portion of the bead portion.
5. The method according to claim 4,
The protrusion is a heavy-duty pneumatic tire for preventing attachment and detachment damage, characterized in that it is coupled to the surface of the inward portion of the bead portion and the surface of the turn-up portion.
5. The method according to claim 4,
In the cross section of the bead portion, the height of the end of the turn-up portion is the same as the height (H) of the center point of the maximum thickness portion of the protrusion.
The method according to claim 1,
In the cross section of the bead, the height (H) of the center point of the maximum thickness of the protrusion is 20 to 25 millimeters (mm).
The method according to claim 1,
The maximum thickness (T) of the protrusion is a heavy-duty pneumatic tire for preventing attachment and detachment damage, characterized in that it is 3 to 5 millimeters (mm).
The method according to claim 1,
The width (W) of the protrusion is a heavy-duty pneumatic tire for preventing attachment and detachment damage, characterized in that it is 10 to 15 millimeters (mm).
The method according to claim 1,
The distance (G) between the center point of one of the plurality of protrusions and the center point of the other protrusion is 5 to 30 millimeters (mm).

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