KR20190094885A - A pneumatic tire for vehicle - Google Patents

Abstract

The present invention relates to a pneumatic tire and, more specifically, relates to a pneumatic tire applied with two sheets of a carcass to improve durability and productivity of a tire by improving an edge portion thereof. According to an embodiment of the present invention, the pneumatic tire comprises a tread portion (100), a sidewall portion (200), and a bead portion (300). In the pneumatic tire for a vehicle, a carcass forming a frame of the tire is installed at an internal side of the tire, and the carcass is composed of two sheets of a first carcass (400) and a second carcass (500). The first carcass (400) is turned up in the bead portion (300), and a dead end (510) of the second carcass (500) does not reach the bead portion (300).

Description

Automotive pneumatic tires {A PNEUMATIC TIRE FOR VEHICLE}

The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire that improves the durability and productivity of the tire by improving the edge portion in the pneumatic tire applying two carcass.

Among the structure of the tire (Car), carcass serves as a skeleton of the tire and plays a very important role in determining the tire profile. For this reason, the structure and the material of the carcass of a vehicle tire are developed variously.

Among the various carcass structures, when the width is wide and the section height of the tire is low, the end of the carcass is close to or close to the end of the tread and the bead filler. The end of the tire is located in the flexible zone, so the durability of the tire is weak. In other words, the end of the carcass can be the cause of cracks, and efforts are being made to improve it.

Hereinafter, a look at the prior art on improving carcass durability. The identification code in the following prior art is not relevant to the present invention.

Republic of Korea Utility Model Registration No. 0130554 'Pneumatic tire with improved durability of the carcasston end end' is formed by placing a soft apex (3) on a solid apex (2) in a conventional tire, but with a soft apex and a hard apex By forming the boundary of the carcass gradually rising from the inside of the carcass to the outside of the carcass so that the upper end of the hard apex is above the end of the carcass turn-up, thereby reducing the strength difference between the carcasston end and the adjacent apex. It is formed. However, in the above technique, only one sheet of carcass is applied, and thus the overall durability may be insufficient.

Republic of Korea Patent No. 10-0315653 'Pneumatic tire with improved carcass durability' is a carcass that is turned up on the bead portion, the carcass durability to improve the carcass installation effect can be obtained It relates to a pneumatic tire. In the conventional carcass stacking structure, the carcasses 12, 13, and 14 of the carcass casings 12, 13, and 14 surround the bead part 20, and each carcass end is turned up at a predetermined distance from the side part and the bead part. Although the stress caused by the repeated bending movement due to the load is concentrated when the tire is running, the concentration of stress generated at the end of the carcass cannot be completely alleviated and the durability at the end of the carcass is very weak. In the present invention, the carcass is turned up and installed in the bead part, so that one end 10 of one carcass 1 starts from the bottom of one bead core 2 and the other side thereof. After being wound on the bead core 3 and wound on the one side bead core 2 again, the tip portion 11 of the carcass 1 is disposed so as to be located at the bottom of the other bead core 3, thereby With three pieces of carcass as carcass It is possible to obtain the same effect, it is possible to shorten the manufacturing process of the molding process and the semi-finished products, it is disclosed a technique for preventing the separation is generated in the end portion of the carcass bar.

Republic of Korea Utility Model Registration No. 0130554 'Pneumatic tire to improve the durability of the carcasston end part' (published 20 July 1995) Republic of Korea Patent Registration No. 10-0315653 'Pneumatic tire with improved carcass durability' (published June 15, 2001)

The technical problem to be achieved by the present invention is to provide a vehicle-inflated tire for preventing the separation of the carcass edge portion, and to reduce the manufacturing cost.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

In order to achieve the above technical problem, one embodiment of the present invention includes a tread portion 100, the side wall portion 200 and the bead portion 300, the carcass is provided to form a skeleton of the tire inside the tire In the pneumatic tire for a vehicle, the carcass is composed of two pieces of the first carcass 400 and the second carcass 500, the first carcass 400 is turned up in the bead unit 300, The second carcass 500 provides a pneumatic tire for a vehicle in which the end 510 does not reach the bead portion 300.

According to an embodiment of the present invention, there is no carcass turn up edge of the second carcass outside the tire. In general, the serration starts and grows at the carcass turn up edge. However, the present invention can prevent the separation in advance by removing the turn-up edge of the second carcass on the outer side of the tire, thereby improving the tire durability performance.

 In addition, when the present invention is applied, the weight is reduced by 250 ± 50g compared to the conventional two carcass LTUH applied structure. This corresponds to about 2.5% of the total tire weight. That is, according to the present invention can improve the rolling resistance (Rolling Resistance) performance while reducing the weight of the tire by the above difference.

In addition, the present invention can reduce the production cost of the two carcass semi-finished products. If the company produces 50 million tires a year with a 2 ply (2-0) structure, the company can expect to save about KRW34bn annually.

The effects of the present invention are not limited to the above-described effects, but should be understood to include all the effects deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is an explanatory diagram illustrating a carcass structure of a pneumatic tire.
Fig. 2 is a cross-sectional view of the main portion of the body explaining a state in which two conventional carcasses are applied.
Figure 3 is an excerpt sectional view of the main portion of the pneumatic tire of the present invention.
Figure 4 is a cross-sectional view of the main portion of another embodiment of the pneumatic tire of the present invention.

Hereinafter, with reference to the accompanying drawings will be described the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, coupled)" with another part, it is not only "directly connected" but also "indirectly connected" with another member in between. "Includes the case. In addition, when a part is said to "include" a certain component, this means that it may further include other components, without excluding the other components unless otherwise stated.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

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

1 is an explanatory diagram illustrating a carcass structure of a pneumatic tire. Carcass structure is largely divided into STUH, HTUH, MTUH, LTUH. In the case of the small diameter molding method, it generally has a structure of 1-0 and 2-0. In the case of a large diameter molding method, it has a 1-1 structure instead of a 2-0 structure.

A typical 2-0 low turn-up hight (LTUH) structure is shown in FIG. The first carcass winds up the bead wire of the bead part 300 and ends up to half the height of the bead filler, and the second carcass winds up the bead wire of the bead part 300 and turns up to be between 40-60% of the sidewall. Is terminated in

However, this configuration has two turn-up ends on the outside of the tire, and this turn-up end may cause separation, thereby deteriorating the durability of the tire.

Thus, as shown in FIG. 3, the present invention includes a tread part 100, a side wall part 200, and a bead part 300, and a vehicle air in which a carcass is formed to form a skeleton of a tire inside the tire. In the mouth tire, the carcass is composed of two pieces of the first carcass 400 and the second carcass 500, the first carcass 400 is turned up in the bead unit 300, the second The carcass 500 provides a pneumatic tire for a vehicle in which the distal end 510 does not reach the bead portion 300.

In the embodiment of Figure 3, the second carcass 500 is installed on the upper surface of the first carcass 400, the first carcass 400 is bead wire 310 of the bead portion 300 It is turned up by winding from the inside to the outside.

The turned-up end 410 of the first carcass 400 is preferably located at 40 to 70% of the sidewall height (h). In addition, the length of the portion (a) where the first carcass 400 and the second carcass 500 overlap is preferably 15 to 30 mm, and the end 510 of the second carcass 500 is a bead. It is preferable that the edge 321 of the filler 320 is spaced 10 to 30 mm apart. This is to prevent the separation by minimizing the interaction between each end by separating the distance between the end.

According to this configuration, the carcass turn up edge of the second carcass 500 does not exist outside the tire, thereby preventing the separation occurring and growing from the end of the carcass turnup in advance, thereby preventing the tire. Durability can be improved.

Figure 4 is a cross-sectional view of the main portion of another embodiment of the pneumatic tire of the present invention. In the embodiment of Figure 4, the second carcass 500 is installed on the lower surface of the first carcass 400, the first carcass 400 is outside the bead wire 310 of the bead portion 300 It has a structure that is turned up by winding inward.

As in the previous embodiment, the turned-up end 410 of the first carcass 400 has a sidewall height h in order to prevent separation by minimizing the interaction between the ends by spacing the distance between the ends. It is preferably located at 40 to 70%, the length of the portion (b) where the first carcass 400 and the second carcass 500 overlap is 15 to 30mm, the second carcass 500 The end 510 is preferably spaced apart from the edge 321 of the bead filler 320 by 10 to 30mm.

In the embodiment of Figure 4, the end 410 of the first carcass 400 is located on the inner inner liner of the tire so that the turned up end of the carcass does not exist outside. Since the inner liner inside the tire does not come into contact with the external environment, it does not receive any additional stress except stretching. The separation of the tire is mainly caused by the occurrence of the tire from the outside according to the stress of the stretching and external factors, the position change of the turned up end in the above embodiment is significant. According to the configuration of the above embodiment, it is possible to minimize the occurrence and growth of the separation from the outer surface of the tire.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in 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 exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is represented by the following claims, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention.

100: tread section
200: sidewall
300: bead part
310: bead wire
320: bead filler
321: edge
400: first carcass
410: terminal
500: second carcass
510: terminal

Claims (9)

In a pneumatic tire for a vehicle including a tread portion 100, a side wall portion 200 and a bead portion 300, the carcass is formed inside the tire to form a skeleton of the tire,
The carcass is composed of two pieces of the first carcass 400 and the second carcass 500,
The first carcass 400 is turned up in the bead part 300,
The second carcass 500 is a pneumatic tire for a vehicle, characterized in that the end 510 does not reach the bead portion 300.
The method of claim 1,
The second carcass 500 is installed on the upper surface of the first carcass 400
The first carcass 400 is a pneumatic tire for a vehicle, which is turned up by winding the bead wire 310 of the bead part 300 from the inside to the outside.
The method of claim 2,
The turned-up end 410 of the first carcass 400 is a vehicle pneumatic tire, characterized in that located at 40 to 70% of the side wall height (h).
The method of claim 2,
The pneumatic tire for a vehicle, characterized in that the length of the portion (a) where the first carcass 400 and the second carcass 500 overlap is 15 to 30 mm.
The method of claim 4, wherein
End 510 of the second carcass 500 is a pneumatic tire for a vehicle, characterized in that 10 ~ 30mm spaced apart from the edge 321 of the bead filler 320.
The method of claim 1,
The second carcass 500 is installed on the lower surface of the first carcass 400
The first carcass 400 is a pneumatic tire for a vehicle, which is turned up by winding the bead wire 310 of the bead part 300 from the outside to the inside.
The method of claim 6,
The turned-up end 410 of the first carcass 400 is a vehicle pneumatic tire, characterized in that located at 40 to 70% of the side wall height (h).
The method of claim 7, wherein
The vehicle pneumatic tire, characterized in that the length of the portion (b) where the first carcass 400 and the second carcass 500 overlap (15) to 30mm.
The method of claim 8,
End 510 of the second carcass 500 is a pneumatic tire for a vehicle, characterized in that 10 ~ 30mm spaced apart from the edge 321 of the bead filler 320.

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