KR20110095471A

KR20110095471A - Pnumetic tire having a pre-assembly half-finished product

Info

Publication number: KR20110095471A
Application number: KR1020100014947A
Authority: KR
Inventors: 이영선
Original assignee: 금호타이어 주식회사
Priority date: 2010-02-19
Filing date: 2010-02-19
Publication date: 2011-08-25
Also published as: KR101069077B1

Abstract

PURPOSE: A pneumatic tire having pre-assembly single semi-product is provided to reinforce the rubber volume of the bead lower portion by freely changing the thickness of the rim flange extension in the specific range. CONSTITUTION: A pneumatic tire having pre-assembly single semi-product comprises a body ply(400). The body ply comprises a first body ply(410), and a second body ply(420). The pre-assembly single semi-product comprises an inner liner(100), a side assembly(200), and a ply strip(300). The side assembly comprises a rim flange(210), a black side(220), and a base strip(230). The rim flange has an extension portion(211) surrounding the bead portion of the tire. The ply strip is located in the boundary between the first body ply and side assembly.

Description

Pneumatic tire with pre-assembly single semi-finished product {PNUMETIC TIRE HAVING A PRE-ASSEMBLY HALF-FINISHED PRODUCT}

The present invention relates to a pneumatic tire using a pre-assembly single semifinished product in a molding process, and more particularly, to a pneumatic tire using a pre-assembly single semifinished product further comprising a fly strip at the interface between the body ply and the side assembly. will be.

Generally, as shown in FIG. 1, the pneumatic tire forms a skeleton of the tread 10 and the tire in contact with the road surface, and includes a first body ply 410 and a second body ply 420 that withstand internal air pressure and external shock. Located between the body fly portion 400 and the inner fly liner (100) inside the body fly portion 400 to prevent air leakage and between the tread 10 and the body fly portion 400 The first belt 21 and the second belt 22 to prevent the external shock is directly transmitted to the body fly portion 400, and the cap fly attached to the first and second belts to prevent the belt from being separated ( 30), a bead 500 for fixing the rim to the tire, an apex 40 for minimizing the dispersion of the bead 500 and protecting the bead 500, and the body fly part 400 to protect the rim Side assembly consisting of flange 210, black side 220 and base strip 230 And a sampler 50 positioned below the body portion 400 below the bead 500.

In addition, the general production process of such pneumatic tires includes semi-finished products manufactured in the refining process of mixing the chemicals into the rubber, which is a raw material, the rolling and extruding process of manufacturing the blended rubber into semi-finished products, and the cutting process of cutting the semi-finished products to a certain size. It can be divided into molding process for assembling to a certain size and vulcanization process for imparting elasticity by applying heat and pressure to the Green Case made by the molding process.

The molding process will be described in more detail by attaching the components constituting the tire, such as the body ply 400, the bead 500, and the tread 10, which are completed through the semi-finished product manufacturing process, to a molding machine drum to form a cylindrical rubber composite. The process of making is called molding, and the cylindrical object made at this time is called a green case. The molding process is known as the most critical process for tire production, as it affects the quality of the finished product.

The molding process in which the green case is made is performed by assembling the inner liner 100, the sampler 50, and the body fly part 400 on the drum band, attaching the beads 500, and then applying a rubber balloon called a bladder. Inflate and turn up both ends of the semifinished product.

In the above molding process, the first semifinished product assembly generally consists of a combination of semifinished products such as the inner liner 100, the sampler 50, and the side assembly 200.

That is, the inner liner 100 is provided on the inner side of the tire, and the sampler 50 surrounds the body fly part 400 surrounding the bead 500 of the tire. In addition, a side assembly 200 is provided on an outer surface of the tire, and the rim flange 210 of the side assembly forms a structure covering a part of the sampler 50.

However, the bead portion of the tire made of the conventional semi-finished assembly, the body fly topping rubber and the rim plan rubber, which is a different type of rubber contact each other, and the adhesive force is weakened by the stretching motion and frictional heat when a large load or a repetitive load is applied. There was a problem that separation phenomenon occurs.

In addition, when a lack of rubber volume occurs at the lower end of the bead, conventionally, the volume shortage was prevented by increasing the thickness of the sampler 50. However, when the thickness of the sampler 50 is increased, the inner liner of the tire ( Since the thickness of 100) must also be increased, there is a problem in that manufacturing cost increases due to an increase in the volume of the unnecessary inner liner 100.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and extends the rim flange in place of the conventional sampler, and further comprises a pre-assembly single semi-finished product further comprising a fly strip at the interface between the side assembly and the body ply. It is an object to provide a used pneumatic tire.

In order to achieve the above object, the present invention,

A pre-assembly pneumatic tire made through a molding process in which a single semi-finished product is applied to a molding machine and having a body fly portion,

The body fly portion includes a first body fly and a second body fly, and the preassembly single semifinished product includes an inner liner, a side assembly and a fly strip, and the side The assembly has a rim flange with an extension surrounding the bead of the tire and a black side and a base strip, wherein the fly strip is disposed between the first body fly and the side assembly. It is characterized by being located at the interface.

In addition, the fly strip is characterized in that the thickness is 1.0 ~ 2.0mm, the width (W1) is 40mm ~ 70mm, the angle of both ends is 45 degrees or less.

In addition, the thickness of the extension portion of the rim flange is 1.5 ~ 2.5mm, the width (W2) is W2 = BS × 2 + BT + K (BS: the number of bead wire wire, BT: the number of bead wire meeting, K: margin constant) It is characterized by that.

According to the present invention, the molding process is simplified by integrating and supplying the inner liner and the side assembly to the molding machine as a separate semifinished product in a conventional molding process into one semi-finished product.

In addition, by having an extension of the rim fringe, it is possible to reinforce the durability of the bead portion, and since the thickness of the rim flange extension can be freely changed within a certain range, it is possible to reinforce the rubber volume of the bead lower portion.

In addition, by installing a further fly strip at the interface between the body fly and the side assembly, bead separation and turn-up separation can be prevented.

1 is a view showing a cross section of a conventional pneumatic tire.
2 shows a preassembly single semifinished product of the invention.
3 is a view showing that each semi-finished product is attached when manufacturing the first green case in the automatic molding machine type of the tire forming process.
4 is a view showing a bead portion of the pneumatic tire completed by turning up each semi-finished product shown in FIG.

Hereinafter, a preferred embodiment of a pneumatic tire having a pre-assembled single semifinished product according to the present invention will be described with reference to the accompanying drawings.

Figure 2 is a view showing a pre-assembly single semi-finished product of the present invention, Figure 3 is a view showing that each semi-finished product is attached when manufacturing the first green case in the automatic molding machine type of the tire forming process, Figure 4 is the Figure 3 A diagram showing a bead portion of a pneumatic tire completed by turning up each semifinished product shown in FIG.

As shown in FIGS. 2 and 3, the preassembly single semifinished product includes an innerliner 100, a fly strip 300, a rim flange 210, and a side assembly including a black side 220 and a base strip 230. 200).

The rim flange 210 has an extension portion 211 that can sufficiently wrap the bead portion of the tire in place of the gum chafer provided in the conventional tire, one side of the extension portion 211 of the rim flange The end overlaps with the inner liner 100.

Extension portion 211 of the rim flange is preferably a thickness (gage) 1.5 ~ 2.5mm. In the case of a general passenger car or light truck tire, if the thickness of the extension portion 211 of the rim flange exceeds 2.5 mm, the volume of the bead base increases and thus the long toe, When vulcanizing, it may cause the rubber to remain long at the end of the bead), and if it is less than 1.5 mm, the volume of the bead base may be insufficient, which may expose the bead base and the ply code. Because there is.

Also, when the diameter of the bead wire is 1.5 mm, the width W2 of the extension portion of the rim flange is

W2 = BS × 2 + BT + K

(BS: Number of bead wires, BT: Number of bead wires, K: Free constant)

It is preferable to This is the minimum criterion for designing the bead to be sufficiently wrapped.

In more detail with respect to the symbol of the above formula, generally in the form of a rectangular bead (bead), the bead wire is divided into the number of lines (BS) and the number of meetings (BT), the number of double lines (BS) is a bead The number of lines of the bead wire forming the bottom of the wire is shown, and the number of meetings BT represents the number of laminations of the bead wire. For example, if the bead wire is 5 wires 6 times, the number of wires forming the bottom of the bead wire is 5 strands, indicating that the bead wires forming the 5 strands are composed of six layers.

The rim flange 210 having the extension 211 can freely change the thickness of the extension 211 of the rim flange compared to the thickness of the conventional sampler. That is, the thickness of the extension portion 211 of the rim flange can be freely increased within the range of 1.5 to 2.5mm to reinforce the volume of the bead portion.

In addition, the fly strip 300 is installed at the interface between the outermost first body ply 410 and the side assembly 200. This means that the body ply topping rubber and the rim flange rubber are made of different types of rubber, so that the bead separation of tires that may occur between the first body ply 410 and the rim flange 210 may occur. ) And turn-up separation.

In addition, the thickness of the fly strip 300 is preferably 1.0 ~ 2.0mm. This is because if the thickness of the fly strip 300 is too thick, there is a risk that air is filled at both ends of the fly strip 300 during molding. In addition, the width (W1) of the fly strip is preferably 40mm ~ 70mm. This is because the width should be adjusted to cover at least 10 mm based on the upper and lower ends of the apex 40 in the molding process.

In addition, the angle θ of both ends of the fly strip 300 is preferably 45 degrees or less. If the angle θ of both ends is 45 degrees or more, it is because air is likely to remain at both ends of the fly strip 300 during molding.

Hereinafter, a process of forming a pneumatic tire having a pre-assembly single semifinished product according to the present invention will be described as follows.

The conventional molding process of pneumatic tires is 'supply inner liner with sampler-> supply first body ply-> supply second body ply-> bead setting-> turn up-> combination of side assembly' However, the molding process of the pneumatic tire having the pre-assembly single semifinished product according to the present invention is performed by supplying the pre-assembly single semifinished product-> first body fly supply-> second body fly supply-> bead setting-> turn up Since the manufacturing of the green case is completed, a process of combining a separate side assembly is unnecessary, thereby minimizing the molding cycle time.

Although the present invention has been described with respect to the preferred embodiment as described above, the present invention is not limited to this, and those skilled in the art will be able to various modifications and applications within the scope without departing from the gist of the present invention.

100: inner liner 200: side assembly 210: rim flange
211: extension portion of the rim flange 220: black side 230: base strip
300: fly strip 400: body fly portion 410: first body fly
420: second body fly 500: bead W1: width of the fly strip
W2: Width of rim flange extension

Claims

A pre-assembly pneumatic tire made by applying a single semi-finished product to a molding machine and having a body fly portion 400,
The body fly portion 400 includes a first body fly 410 and a second body fly 420,
The preassembly single semifinished product includes an inner liner 100, a side assembly 200 and a fly strip 300,
The side assembly 200 may include a rim flange 210, a black side 220, and a base strip 230 having an extension portion 211 surrounding the bead portion of the tire. Equipped,
The ply strip (300) is a pneumatic tire having a pre-assembly single semi-finished, characterized in that located on the interface between the first body fly (410) and the side assembly (200).

The method of claim 1,
The ply strip 300 has a thickness of 1.0 to 2.0mm, a width (W1) of 40mm to 70mm, the pneumatic tire having a pre-assembled single semi-finished product, characterized in that the angle (θ) of both ends is 45 degrees or less.

The method of claim 1,
The thickness of the extension portion 211 of the rim flange is 1.5 ~ 2.5mm, the width W2 is W2 = BS × 2 + BT + K (BS: the number of bead wire wire, BT: the number of bead wire meeting, K: margin A pneumatic tire having a pre-assembly single semifinished product, characterized in that).