KR20120001055A - Pneumatic tire with excellent bead structure and method of manufacturing thereof - Google Patents

Pneumatic tire with excellent bead structure and method of manufacturing thereof Download PDF

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Publication number
KR20120001055A
KR20120001055A KR1020100061631A KR20100061631A KR20120001055A KR 20120001055 A KR20120001055 A KR 20120001055A KR 1020100061631 A KR1020100061631 A KR 1020100061631A KR 20100061631 A KR20100061631 A KR 20100061631A KR 20120001055 A KR20120001055 A KR 20120001055A
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South Korea
Prior art keywords
bead
apex
heavy
reinforcement
bead core
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KR1020100061631A
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Korean (ko)
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KR101141881B1 (en
Inventor
정영진
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금호타이어 주식회사
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Priority to KR1020100061631A priority Critical patent/KR101141881B1/en
Publication of KR20120001055A publication Critical patent/KR20120001055A/en
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Publication of KR101141881B1 publication Critical patent/KR101141881B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0628—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0628—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer
    • B60C15/0632—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer using flippers in contact with and wrapped around the bead core and, at least partially, in contact with the bead filler
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C2015/0617—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber
    • B60C2015/0625—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber provided at the terminal edge portion of a carcass or reinforcing layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0628—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer
    • B60C2015/0678—Physical properties of the bead reinforcing layer, e.g. modulus of the ply

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  • Tires In General (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

The present invention discloses a heavy duty pneumatic radial tire having a bead portion reinforcement structure and a method of manufacturing the same.
Heavy-duty pneumatic radial tires having a bead reinforcement structure according to the present invention are tread, sidewall, bead, and ends that extend from the tread and extend the bead. In a heavy-duty pneumatic radial tire comprising a carcass ply having an end, the bead portion includes a bead core, an apex and a reinforcement portion, wherein the bead core portion is provided with a plurality of bead core portions. Made of a bead wire, wherein the apex portion is a soft rubber material formed integrally with the bead core portion, the reinforcement portion wraps the bead core portion and the apex portion, the outside of the bead portion equal to the height of the end It is characterized in that it is formed or low, thereby improving the adhesion between the bead bundle and the carcass, thereby improving the durability of the bead portion Furthermore, reducing the waste of material that is generated during the extrusion and apex portion, it is possible to improve the operability accompanying.

Description

Pneumatic tire with excellent bead structure and method of manufacturing description

The present invention relates to a heavy-duty pneumatic radial tire having a bead portion reinforcement structure and a method of manufacturing the same, and more particularly, to improve adhesion between the bead bundle and carcass, thus improving the durability of the bead portion and further extrusion of the apex portion. The present invention relates to a heavy-duty pneumatic radial tire having a bead portion reinforcing structure capable of reducing waste of materials generated during the work and improving workability accordingly.

In general, pneumatic tires used for heavy loads need to reinforce the bead to withstand high loads, which means that the stress applied by pneumatic tires is greatest at the interface with the wheels attached to the rim. This is because the phenomenon of breakage or separation of the bead portion occurs at the interface.

1 is a right half sectional view of a conventional pneumatic tire.

Referring to FIG. 1, a carcass splice 20 is used in a pneumatic tire 10 commonly used in a vehicle, and the carcass splice 20 includes a plurality of cords in a bead part 3. Turned up to surround the bead core 50 and the airpex 40 is installed to have a reinforcing portion (30).

The pneumatic tire 10 is the bead portion (3) and the tread portion (1) having a risk of cracking under the most force in accordance with the load of the vehicle, the sidewall portion that is vulnerable due to frequent bending movement In order to reinforce (2), components such as a hopper, a chevron, an insert rubber strip, and a steel wire are additionally configured to reinforce, but still bear the burden of manufacturing cost.

Furthermore, in the end 60 portion of the airpex 40, the position of the end of the carcass splice is located outside the sidewall and the apex with respect to the end 60 of the apex, so that the separation by the flexion movement during the driving is very good. There is a weak point, which has a problem that can cause a large accident due to the separation while driving.

Furthermore, in order to strengthen the bead portion of the pneumatic tire, a structure in which two or four nylon chafers are attached to the turn-up portions of the carcass and the steel chafers in and out is used. The bead reinforcement structure not only concentrates the stress at the bead site during overloading but also changes the carcass line in the bent area so that it can not support this, and in the end, the cord breakage may occur at the bead part, resulting in the risk of large accidents. In order to improve this problem, methods such as changing the apex height and attaching a nylon chaper to the inside and outside of the carcass turn-up part have been proposed, but there is still a problem that a cord rupture phenomenon occurs in the bead part.

In more detail, through the structure of the reinforcement of the conventional bead portion through Figure 2, Figure 2 is a right half cross-sectional view to enlarge the bead portion of the pneumatic tire conceptually showing the shape reinforcing the structure of the conventional bead portion, the reinforcement structure of the conventional bead portion is a plurality Two bead cords 210 wrapped with nylon (wrapper 220) and bead bundles 230, and provided to be in direct contact with the bead bundles, hard apex (HARD APEX, 240) and soft apex (SOFT APEX, 250) is composed of an apex unit 240, 250, which is integrally extruded, the bead bundle 230, a carcass unit 260 surrounding the apex unit (240, 250).

However, as mentioned above, even in this conventional technology, the problem of weakening the seating and durability of the bead bundle due to the decrease in adhesion force generated at the interface between the bead bundle 230 and the carcass portion 260 due to the high load still remains. have.

On the other hand, due to the fact that the hard apex (HARD APEX, 240) and the soft apex (SOFT APEX, 250) constituting the apex unit integrally extruded, the problem of inevitably occurring material waste and workability is reduced.

Therefore, the first technical problem to be solved by the present invention is to improve the adhesion between the bead bundle and the carcass, thus improving the durability of the bead portion and further reduce the waste of material generated during extrusion of the apex portion, resulting in workability To provide a heavy-load pneumatic radial tire having a bead portion reinforcement structure that can improve the.

In addition, the second technical problem to be solved by the present invention is to improve the adhesion between the bead bundle and the carcass, thus improving the durability of the bead portion and further reduce the waste of material generated during extrusion of the apex portion, resulting in workability It is to provide a manufacturing method of a pneumatic radial tire for a heavy load having a bead portion reinforcement structure that can improve the.

The present invention to solve the first technical problem described above,

Heavy-duty pneumatics comprising a tread, a side wall, a bead and a carcass ply having an extension extending from the tread and an end that wraps around the bead In a radial tire, the bead part comprises a bead core, an apex part and a reinforcing part, wherein the bead core part includes a plurality of bead wires, and the apex part is a soft rubber material. It is formed integrally with the bead core portion, the reinforcement portion is wrapped around the bead core portion and the apex portion, the outside of the bead portion is a heavy load air having a bead portion reinforcement structure, characterized in that formed in the same or lower than the height of the end Provides mouth radial tires.

According to one embodiment of the invention, the reinforcing portion may be made of a hard rubber material.

According to another embodiment of the present invention, the soft rubber material may have a volume modulus of 2 to 10 MPa.

According to another embodiment of the present invention, the hard rubber material may have a volume modulus of 2 to 10 MPa.

On the other hand, the present invention in order to solve the above-described second technical problem by sequentially stacking the carcass ply, reinforcement to the upper portion of the brada provided on the tire molding machine and attaching the bead core unit and the apex unit integrally coupled The present invention provides a method for manufacturing a heavy-load pneumatic radial tire having a bead portion reinforcement structure, which is manufactured by turning up the carcass splice and the reinforcement portion with respect to the bead core portion and the apex portion.

Heavy-duty pneumatic radial tires having a bead portion reinforcement structure and a manufacturing method thereof according to the present invention improve the adhesion between the bead bundle and the carcass, thus improving the durability of the bead portion and furthermore, It has the effect of reducing waste and improving workability accordingly.

1 is a right half cross-sectional view of a conventional pneumatic tire.
2 is an enlarged right half sectional view of a bead portion of a pneumatic tire conceptually showing a shape in which a structure of a conventional bead portion is reinforced.
3 is an enlarged right half sectional view of the bead portion of a heavy-load pneumatic radial tire having a bead portion reinforcement structure according to the present invention.

Hereinafter, the present invention will be described in more detail.

As described below, the present invention will be described by way of example, but only by way of example, which is merely illustrative, and those skilled in the art to which the present invention pertains various modifications and equivalent embodiments thereof. I understand that it is possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The invention is a heavy load including a tread, a sidewall, a bead and a carcass ply having an extension extending from the tread and an end that wraps around the bead. In a medium pneumatic radial tire, the bead portion includes a bead core, an apex and a reinforcement, wherein the bead core includes a plurality of bead wires, and the apex portion is a soft rubber. The material is integrally formed with the bead core part, and the reinforcement part surrounds the bead core part and the apex part and is formed to be equal to or lower than the height of the end portion outside the bead part.

3 is an enlarged right half sectional view of the bead portion of a heavy-load pneumatic radial tire having a bead portion reinforcement structure according to the present invention.

Referring to FIG. 3, an apex portion 350 made of a soft rubber material, a bead core portion 330 having a plurality of bead wires 310 and a wrapper 320 are integrally formed, and the apex portion is formed. It can be seen that the reinforcement part 340 is provided to surround the 350 and the bead core part 330.

Although the bead core portion 330 is shown as having a bead wire 310, the wrapper 320, even if it includes all, less or more, it does not change the technical spirit of the present invention.

In addition, the reinforcing portion 340 is formed to a position lower than the end of the carcass ply 360 at the outer side (OU) of the bead portion, which is concentrated in the end of the stress caused failure such as cracking caused by durability This can cause a decrease.

In addition, the reinforcement part 340 may be formed at the inner side IN of the bead regardless of the position of the carcass splice 360.

On the other hand, the reinforcing portion 340 may be formed of a hard rubber material, the hard rubber material is not limited to its type or amount as long as the volume elastic modulus is 2 to 10 MPa rubber.

In the case of compressing an object, the volume elastic modulus described here is expressed as p 1 below when the pressure applied to each side of the object is p, the volume V, and the volume change ΔV (the differential pressure of the initial pressure at the later pressure).

<Equation 1>

Pressure (p) =

Figure pat00001

In Equation 1, B is referred to as volume modulus.

If the volume modulus of elasticity of the hard rubber material is less than 2 MPa, it may be difficult to provide reinforcement to solve the problem that the adhesion force is reduced by the external force received by the bead core part 330 due to the stretching movement during driving. On the contrary, if it exceeds 10 MPa, there is no problem in imparting reinforcement, but there may be a problem of deteriorating a sense of stability in riding or stretching exercise.

In addition, as long as the soft rubber material is rubber having a volume modulus of 2 to 10 MPa, the type and amount thereof are not limited. If it is less than 2 MPa, it is difficult to minimize the dispersion of the bead core portion 330, it may be difficult to mitigate the impact received by the bead core portion, if the contrary exceeds 10 MPa, it is formed integrally with the bead core portion 330 It can be difficult.

On the other hand, the heavy-load pneumatic radial tire having a bead portion reinforcement structure according to the present invention, the carcass splice 360 on the top of the Brada (not shown, conventional tire molding machine, Brada) equipped on the tire forming machine ), Sequentially laminating the reinforcement part 340, and then attaching the bead core part 330 and the apex part 350 which are integrally coupled to each other, and using the brada, the carcass splice 360 ) And the reinforcement part 340 is turned up around the bead core part 330 and the apex part 350.

The carcass ply 360 and the reinforcing part 340 are sequentially stacked on the upper portion of the brada, but of course, this may further include additional components such as an inner liner.

Accordingly, waste and work of materials generated in the process of extruding the soft and hard apex, which is a conventional process, and attaching them to the bead bundle, and then turning up with a carcass splice provided on the upper portion of the brada provided on the tire forming machine. It will be possible to improve sex.

Apex unit 350, bead wire 310
Wrapping paper 320, bead core part 330
Reinforcement 340, carcass splice 360

Claims (5)

Heavy-duty pneumatics comprising a tread, a side wall, a bead and a carcass ply having an extension extending from the tread and an end that wraps around the bead In radial tires,
The bead part includes a bead core, an apex part and a reinforcing part,
The bead core portion comprises a plurality of bead wires, the apex portion is formed of a soft rubber material integrally with the bead core portion, the reinforcement portion is wrapped around the bead core portion and the apex portion, outside the bead portion A heavy-loaded pneumatic radial tire having a bead portion reinforcement structure, characterized in that it is formed equal to or less than the height of the end.
The method of claim 1,
The reinforcement portion is a heavy-duty pneumatic radial tire having a bead portion reinforcement structure, characterized in that made of a hard rubber material.
The method of claim 1,
The soft rubber material has a bulk elastic pneumatic radial tire having a bead portion reinforcement structure, characterized in that the volume modulus of 2 to 10 MPa.
The method of claim 2,
The hard rubber material is a heavy-loaded pneumatic radial tire having a bead portion reinforcement structure, characterized in that the volume modulus of 2 to 10 MPa.
Carcass ply, the reinforcement part is sequentially stacked on the upper portion of the brada provided on the tire molding machine, and then the bead core part and the apex part are integrally combined and the bead core part is used by the brada. And a method for producing a heavy-duty pneumatic radial tire having a bead portion reinforcement structure, characterized in that it is manufactured by turning up around the apex portion.
KR1020100061631A 2010-06-29 2010-06-29 Pneumatic tire with excellent bead structure and method of manufacturing thereof KR101141881B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101512634B1 (en) * 2013-10-30 2015-04-16 금호타이어 주식회사 Pneumatic tire with reinforced bead portion
CN110194029A (en) * 2019-06-26 2019-09-03 青岛双星轮胎工业有限公司 Steel wire carcass HT tire and its manufacturing process

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6972061B1 (en) 1999-12-06 2005-12-06 The Goodyear Tire & Rubber Company Compound apex for vehicle tire
JP3116044B2 (en) * 2000-02-14 2000-12-11 住友ゴム工業株式会社 Pneumatic tires for heavy duty, light trucks
JP4542177B2 (en) 2008-07-04 2010-09-08 株式会社ブリヂストン Heavy duty tire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101512634B1 (en) * 2013-10-30 2015-04-16 금호타이어 주식회사 Pneumatic tire with reinforced bead portion
CN110194029A (en) * 2019-06-26 2019-09-03 青岛双星轮胎工业有限公司 Steel wire carcass HT tire and its manufacturing process
CN110194029B (en) * 2019-06-26 2023-08-15 青岛双星轮胎工业有限公司 Steel wire carcass HT tire and manufacturing process thereof

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