KR102130374B1 - Method of manufacturing pneumatic tire for heavy duty vehicle and tire thereof - Google Patents

Abstract

Disclosed in the present invention are a method of manufacturing a heavy-duty pneumatic radial tire and a tire manufactured thereby. In particular, the method comprises the steps of: orienting steel cords upward by upwardly bending an end portion of a steel cord carcass (S1); inserting one end portion of a fabric unit between the steel cords (S2); orienting the steel cords upwardly by upwardly bending the other end portion of the steel cord carcass, and inserting upwardly-oriented second steel cords into the other end portion of a second fabric unit (S3); and bending an end portion of the fabric unit, end portions of the steel cords inserted in the other end portion of the second fabric unit, and the other end portion of steel cords so as to cover the top of the end portion of the fabric unit and the other end portion of the second fabric unit (S4). Accordingly, the present invention can reduce bead portion separation and side portion separation that frequently occur in a heavy-duty pneumatic radial tire travelling under severe conditions; can eliminate reinforcing materials used in the bead portion and side portion of the tire, thus preventing separation caused by the tip and step of the reinforcing material; and can improve handling performance by enhancing the rigidity of the side portion.

Description

Method of manufacturing pneumatic radial tire for heavy load and its tire

The present invention relates to a method for manufacturing a pneumatic radial tire for a heavy load and a tire thereof, and more specifically, to strengthen the bead portion separation and to improve the handling performance that frequently occurs in a pneumatic radial tire for a heavy load running in harsh conditions. To this end, the present invention relates to a heavy-duty pneumatic radial tire that improves durability and improves handling performance by preventing separation and side separation occurring in a bead portion in contact with a vehicle rim.

Since the conventional pneumatic radial tire for heavy loads runs under harsh conditions, the bead portion separation frequently occurs.

In order to prevent such a bead separation, reinforcing materials of various materials such as steel, aramid, and nylon have been applied.

Although the bead part separation can be prevented by the application of such a reinforcing material, additional separation may be caused by the end and step of each reinforcing material.

Further, in order to improve handling performance, a reinforcement material of rubber and fabric is applied to the side portion, but side separation frequently occurs for the above reasons.

5 is a view showing a tire to which a conventional bead and a side structure are applied, and the bead portion structure of a conventional tire is an inner liner 1, a first carcass 2, a second carcass 3, and a bead 4 ), Apex (5), bead part reinforcement (6), bead part and side part reinforcement (7). In the case of heavy-duty pneumatic radial tires, the operating conditions such as overload and unpaved roads are severe, resulting in stress and The problem of frequent bead and side separation due to heat generation is still exposed.

For the purpose of improving the beads, side separation, so far, various materials of reinforcing materials (6, 7) and fabric (8) as shown in FIG. 6 have been applied, but the inner liner (1), the second carcass (3), The ends of the bead reinforcement 6, the bead and side reinforcement 7 can be seen concentrated in the bead, and additional bead separation is caused by the end and step of each semi-product in the bead, , Separation of the semi-finished products with different materials may also cause side part separation where the interface is separated.

Republic of Korea Patent Publication No. 1997-0069312 Republic of Korea Patent Publication No. 2009-0132143

The first technical problem to be solved by the present invention is to generate a bead portion that frequently occurs in pneumatic radial tires for heavy loads running in harsh conditions, and to improve the handling performance and to generate a bead portion in contact with the rim of the vehicle. It is to provide a method for manufacturing a heavy-duty pneumatic radial tire that improves handling performance by improving durability and improving side durability by preventing separation and side separation.

The second technical problem to be solved by the present invention is to generate a bead portion that frequently occurs in pneumatic radial tires for heavy loads running in harsh conditions, and to improve the handling performance, a bead portion generated in contact with the rim of the vehicle It is to provide a pneumatic radial tire for heavy loads that improves durability and improves handling performance by preventing separation and side separation, thereby improving durability.

In order to solve the first technical problem described above, the present invention is a step (S1) of bending the end of the steel cord carcass upwards to orient the steel cords toward the upper side, and fitting one end of the fabric portion between the steel cords ( S2), the step of bending the other end of the steel cord carcass upwards so that the steel cords are oriented upward and fitting the second steel cords oriented upward to the other end of the second fabric part (S3) and the end of the fabric part And, for the heavy load, characterized in that it comprises a step (S4) of bending the end of the steel cord inserted into the other end of the second fabric portion, the other end of the steel cord to cover the upper end of the fabric portion, the other end of the second fabric portion Provided is a method of manufacturing a pneumatic radial tire.

According to an embodiment of the present invention, both ends of the steel cords may be 95 to 175° at an angle perpendicular to the upper side of the steel cord carcass.

On the other hand, the present invention, in order to solve the second technical problem described above, in the tire of the structure of the turn-up surrounding the bead portion including the inner liner, the first carcass, the bead and apex, between the first carcass and the bead portion It provides a pneumatic radial tire for heavy loads, comprising a combination of a fabric part and a steel cord carcass, and both ends of the steel cord are fitted through both ends of the fabric part.

According to an embodiment of the present invention, the position of one end of the steel cord carcass of the assembly is arranged at a position of H2 = 1/2 × H1 or less, and the position of the other end of the steel cord carcass is located at the H3 section It may be.

According to the present invention as described above, it is possible to improve the bead section separation and side section separation that frequently occur in pneumatic radial tires for heavy loads running in harsh conditions, and to be used in the bead section and side section of the tire. It is possible to remove the reinforcing material, thereby preventing the separation caused by the end and step of the reinforcing material, and by increasing the rigidity of the side portion, it can also exhibit an effect of improving the handling performance.

1 is a top right sectional view of a pneumatic radial tire for heavy load according to the present invention,
Figure 2 is a picture of the shape of both ends of the steel cord of the present invention is bent upward to expose the steel wire,
3 is a view showing a shape that is bent to the upper side of the present invention and enters the rolling roller while the fabric portion is fitted to the steel wire,
Figure 4 is a view showing a portion of the cross-section of the fabric portion and the steel cord carcass after rolling with the rolling roller of Figure 3,
5 is a view showing a part of the upper right peninsula of the tire centered on the bead and side of a conventional tire,
6 is a view showing a cross-section of a fabric carcass applied to a conventional pneumatic radial tire.

Hereinafter, with reference to the accompanying drawings will be described in detail preferred embodiments that can be easily carried out by the person of ordinary skill in the art.

However, in the detailed description of the operation principle of the preferred embodiment of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

This is to more clearly communicate the core of the present invention by omitting unnecessary description.

In addition, the present invention can be modified in various ways and can have various embodiments. However, specific embodiments are illustrated in the drawings and described in detail in the detailed description, but this is not intended to limit the present invention to specific embodiments. , It should be understood to include all modifications, equivalents, or substitutes included in the spirit and scope of the present invention.

In addition, terms including ordinal numbers such as first and second are used to describe various components, and are used only for the purpose of distinguishing one component from other components, and to limit the components It is not used. For example, the second component may be referred to as a first component without departing from the scope of the present invention, and similarly, the first component may also be referred to as a second component.

In addition, when referring to a component being "connected" or "connected" to another component, it means that it can be connected or connected logically or physically.

In other words, it may be understood that a component may be directly connected to or connected to other components, but other components may exist in the middle and may be connected or connected indirectly.

However, the terms used herein are only used to describe specific embodiments, and are not intended to limit the present invention.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In addition, terms such as "comprises" or "have" described herein are intended to indicate that there are features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, or one or more thereof. It should be understood that the above or other features or numbers, steps, actions, components, parts or combinations thereof are not excluded in advance.

1 is a top right sectional view of a pneumatic radial tire for heavy loads according to the present invention, and FIG. 2 is an illustration of a shape in which both ends of the steel cord of the present invention are bent upward to expose the steel wire, and FIG. 3 is the present invention It is a figure showing a shape that is bent to the upper side and enters the rolling roller while the fabric portion is fitted to the steel wire, and FIG. 4 is a diagram showing a part of the cross section of the fabric portion and the steel cord carcass after rolling with the rolling roller of FIG. Refer to it.

The manufacturing method of the pneumatic radial tire 100 for a heavy load according to the present invention is a step (S1) of bending the end of the steel cord carcass upwards to orient the steel cords toward the upper side, and one end of the fabric portion between the steel cords Step S2 of fitting, and bending the other end of the steel cord carcass upwards so as to orient the steel cords toward the upper side and fitting the second steel cords oriented upwards to the other end of the second fabric part (S3). , The end of the fabric portion, the steel cords inserted into the other end, the second steel cord is characterized in that it comprises a step (S4) of bending the upper end of the fabric portion, the other end.

The step S1 is a process in which the ends of the steel cord carcass are bent upwards to orient the steel cords toward the upper side, and the steel cord carcass 110 is a semi-finished product in which steel cords are aligned at a certain angle to secure strong durability. To prepare, the steel cords 114 are prepared by winding a steel wire 116 having a small diameter so as to have a certain pitch, and bending the end 112 upward to bend the steel cords 114 or It may be a step of orienting the steel wire 116 upward.

Here, the steel cord carcass may be provided with a steel cord upper layer 118 and a lower layer 118' by topping the tire rubber and the carcass rubber, and the topping may be applied to the binder 500 later.

Next, looking at step S2, as a process of fitting one end of the fabric portion between the steel cords, upwards to one end 212 of the fabric portion 200 woven with synthetic fibers such as nylon, polyester, rayon, aramid, and the like. The bent steel wire end 112 may be fitted to pass through the fabric portion through the woven gap.

Next, referring to step S3, the other end portion 112' of the steel cord carcass is bent upward, and the steel cords are oriented so as to face upward, and the upper end is oriented toward the other end 212' of the second fabric portion 200'. This is the process of fitting the old second steel cords.

Fabric parts 200 and 200' are sandwiched between both ends 112 and 112' of the steel cord carcass formed by the above-described process. Furthermore, the second steel cord carcass 300 are prepared and manufactured in the same manner. 3 Of course, it is possible to adjust the durability of the process by inserting more steel cord carcass and fabric parts into the fabric part 300' to have various shapes.

Next, looking at step S4, the end portion 212 of the fabric cord 200, the other end portion 212' of the steel cord inserted into the other end portion 212' of the second fabric portion 200', This is a process of bending the end 112' to cover the upper end of the fabric portion and the other end of the second fabric portion.

That is, by firmly coupling both ends of the steel cords fitted to both ends of the fabric part and the second fabric part, a structure in which both ends of the steel cords are strongly connected to each other is formed.

Therefore, both ends 112 and 112' facing upwards may be bent at a time by means such as a press or a rolling roller, for example, the fabric part 200 through the calendar machine roll 400 used in the rolling process. It can be bent to cover the upper end of the fabric portion, the other end of the second fabric portion by proceeding between the rollers to rotate (R) by engaging the ends of the steel cords fitted in the rolling process similarly.

In order to prevent the steel cords from being crossed or bent in a direction other than the direction in which the fabric part is held, an angle perpendicular to the upper end of the steel cord carcass is formed at both ends 112 and 112' of the steel cords. Beyond, it can be bent to achieve 95 to 175° (angle (A) is 5 to 85° when viewed from the side of the steel cord carcass). If it is less than 95°, both ends of the steel cords may be turned in different directions. It is difficult to strongly bind the fabric portion over, and on the contrary, if it exceeds 175°, it may be difficult to insert the fabric portions at both ends of the steel cords.

As described above, by preparing the combination 500 of the steel cord carcass and the fabric part, a conventional tire is manufactured, that is, the inner liner 1 and the first carcass 2 in order (second, if necessary). , 3 carcass can be further stacked), the present invention in the order of preparing the tire shape through a forming drum to turn the coupling member 500 around the bead (4), the apex (5) and turning it up, through a vulcanization process, etc. Following this, a pneumatic radial tire for heavy loads will be manufactured.

Here, the position of the end that is turned up while surrounding the bead portions 4 and 5 of the assembly 500 is important, and the position of one end of the steel cord carcass among the combinations is H2 = 1/2×H1 (H1 is the lower part of the bead) To the tread surface (height from T to the height), it is desirable to place it at a location less than or equal to H2. The position of the other end of the carcass is positioned in the H3 (height of the bead) section, thereby effectively protecting the bead 4 and the apex, thereby suppressing the occurrence of separation between the bead portion and the side portion S.

On the other hand, the heavy-duty pneumatic radial tire according to the present invention comprises: an inner liner (1), a first carcass (2), a bead comprising a bead (4) and an apex (5); 1 It is characterized in that it comprises a combination of the fabric portion and the steel cord carcass between the carcass and the bead.

The combination 500 of the fabric portion and the steel cord carcass is characterized in that both ends of the fabric portion are bent with steel cords of the steel cord carcass bent and the manufacturing method is as described above.

In addition, the position of the end of the turn-up surrounding the bead portions 4 and 5 of the assembly 500 is important. The position of one end of the steel cord carcass among the combinations is H2 = 1/2×H1 (H1 is the lower part of the bead) To the tread surface (height from T to the height), it is desirable to place it at a location less than or equal to H2. The position of the other end of the carcass is positioned in the H3 (height of the bead) section, thereby effectively protecting the bead 4 and the apex, thereby suppressing the occurrence of separation between the bead portion and the side portion S.

1: Inner liner, 2: First carcass, 3: Second carcass, 4: Bead, 5: Apex, 6: Bead reinforcement, 7: Bead and side reinforcement, 8: Fabric carcass, 9: Carcass made of steel, 10: Calender machine roll (compression) for rolling progress, 11: Space generated by weaving between cords, 110: Steel cord carcass, 114: Steel cords, 116: Steel wire, 112 : Steel cord end, 118: upper layer, 118': lower layer, 500: binder, 200: fabric part, 212: one end of fabric part, 112': other end part of steel cord carcass, 200': second fabric part, 212 ': the other end of the second fabric portion, 300: the second steel cord carcass, 300': the third fabric portion, 400: calendar machine roll, R: rotation, A: the bent angle, H1: tread surface under the bead portion Height to (T), H3: Bead height, S: Side part

Claims (4)

Bending the end of the steel cord carcass upwards to orient the steel cords to face upwards (S1);
Step of sandwiching one end of the fabric portion between the steel cord (S2);
Bending the other end of the steel cord carcass upwards so that the steel cords are oriented upward and fitting the second steel cords oriented upwards to the other end of the second fabric part (S3); And
Including the step of bending the end of the fabric portion, the end of the steel cords inserted into the other end of the second fabric portion, and the other end of the steel cords so as to cover the upper end of the fabric portion and the other end of the second fabric portion (S4); A method for manufacturing a pneumatic radial tire for a heavy load, characterized in that.
According to claim 1,
A method of manufacturing a pneumatic radial tire for heavy loads, characterized in that both ends of the steel cords have an angle perpendicular to the upper side of the steel cord carcass, which is 95 to 175°.
An inner liner, a first carcass, a tire having a structure that is turned up while surrounding a bead part including a bead and an apex, comprising a combination of a fabric part and a steel cord carcass between the first carcass and the bead part, and steel cord A heavy-duty pneumatic radial tire, characterized in that both ends of the fabric are fitted through both ends of the fabric portion.
The method of claim 3,
The position of one end of the steel cord carcass of the assembly is arranged at a position of H2 = 1/2 × H1 or less, and the position of the other end of the steel cord carcass is located in the H3 section. Radial tire.

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