KR20100044660A - Pneumatic tir - Google Patents

Abstract

PURPOSE: A pneumatic tire is provided to prevent rolling at a top of an apex in a forming operation by reinforcing the apex which is protected with bead reinforcing material. CONSTITUTION: A pneumatic tire comprises: a shoulder part(20) which is formed at both ends of a tire width; a side wall part(30); and a bead part(40) which includes bead reinforcing material(100) which protects a top of an apex. The bead reinforcing material is placed between a carcassply(61), the apex(42), and a bead wire(41). The bead reinforcing material whose thickness is in a range of 0.6mm-0.1mm and which is extended and bent up in order to wrap the bead wire and to open the part of the outer surface of the apex.

Description

Pneumatic Tires {PNEUMATIC TIR}

The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire that can improve the working efficiency by preventing the phenomenon of the top of the A-fax of the bead portion during the molding operation.

As is well known, the pneumatic tire has a shoulder portion, a side wall portion, and a bead portion extending in both width directions with respect to the tread portion, respectively.

The bead part allows the tire to be seated on the rim to maintain the internal air pressure, and serves to maintain the road surface shock absorbing force transmitted from the sidewall part during driving and restoring force when cornering.

Currently, Slim A-Fax has been applied to optimize the bead volume to reduce tire weight and increase durability.

Such slim A-fax has a thin thickness, and because it uses a soft compound, the curling phenomenon occurs at the upper end of the tire gradually becomes thin when forming a tire.

The top curl phenomenon of the A-fax increases the pneumatic ability on the carcass ply interface to reduce the durability, and has a problem of reducing the work efficiency during the molding operation of the tire.

An object of the present invention for solving the above problems is, pneumatic tires that can improve the durability and working efficiency by preventing the curling phenomenon occurring at the top of the A-fax during molding work by reinforcing the A-fax wrapped with a bead reinforcement will be.

In the pneumatic tire of the present invention for achieving the above object, a shoulder portion, a side wall portion, and a bead portion are formed on both sides in the tire width direction with respect to the tread portion, respectively, and the tread portion, the shoulder portion, the side wall portion, and the inside of the bead portion In the pneumatic tire that the end of the carcass ply extending to be installed to be folded and wrapped around the bead wire and Apex in the bead portion, the bead portion is interposed between the carcass ply and the Afax and bead wire, the upper portion is It may include a bead reinforcement to wrap around the upper end of the fax.

 The bead reinforcement is preferably formed to extend so that the lower portion wraps around the bead wire so that a portion of the outer surface of Afax is opened.

 It is preferable that the upper part of the bead reinforcement is formed so as not to overlap with the upper part of the hopper and the sample wave, and the length of the bent upper part is in the range of 5 mm to 10 mm. It is preferable to be within.

In addition, the thickness of the bead reinforcement may be made within the range of 0.6mm to 0.1mm.

According to the pneumatic tire of the present invention, by using the bead reinforcement interposed between the carcass ply and Afax to wrap and reinforce the upper end of the Afax, to prevent the curling shape occurring in the Afax upper end to attach the carcass ply It is possible to prevent intake of air generated at the interface and to improve the durability and work efficiency of the tire.

In addition, according to the pneumatic tire of the present invention, the bead reinforcement is formed to further wrap the bead wire so that a portion of the outer surface of the A-fax is open, has the effect of further improving the durability of the bead portion.

In addition, according to the pneumatic tire of the present invention, the length of the portion wrapped around the upper end of the A-fax reinforcement of the bead reinforcement is formed within the range of 5mm to 10mm, by making the thickness of the bead reinforcement is within the range of 0.6mm to 0.1mm, It has an effect that the uniformity of the tire can be kept constant so as not to overlap with the hopper and attached to the outer surface of the A-fax.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement 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 to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a half sectional view of a pneumatic tire according to an embodiment of the present invention.

Referring to FIG. 1, the pneumatic tire according to the present embodiment has a shoulder portion 20, a sidewall portion 30, and a bead portion 40 at both sides of the tread portion 10 along the width direction of the tire. Are formed sequentially.

The inner liner 50 having the airtightness of the carcass ply 60 serving as a skeleton of the tire is inside the tread part 10, the shoulder part 20, the side wall part 30, and the bead part 40. It is laminated on the upper side and is formed extending along the width direction.

In this embodiment, the carcass ply 60 illustrates that the first carcass ply 61 and the second carcass ply 65 are stacked in duplicate.

In the tread portion 10, the belt 11, the under tread 15, and the tread 16 are sequentially stacked on the second carcass ply 60.

The belt 11 is a special coded paper positioned between the carcass ply 60 and the under tread 15 to alleviate external shocks, and cracks or trauma generated in the tread 16 are directly directed to the carcass ply 60. Prevent delivery.

In the present embodiment, the belt 11 exemplarily includes a first belt 12 stacked on the upper side of the carcass ply 60 and a second belt 13 stacked on the first belt 12.

The under tread 15 is used to increase the adhesion between the second belt 13 and the tread 15, and the tread 15 is made of a special rubber material having excellent wear resistance and cutting resistance as a part in direct contact with the road surface. .

In the shoulder portion 20, the thickness of the tread portion 10 gradually decreases, and the side ply portion 30 is connected to the cap ply that covers the ends of the first belt 12 and the second belt 13 ( 21 is laminated on the ends of the first belt 12 and the second belt 13.

The cap ply 21 is a special coded paper attached to the first and second belts 12 and 13 to minimize the movement of the belt 11 when driving, thereby preventing departure from high speed driving.

The side wall portion 30 covers and protects the carcass ply 60 with a rubber material that forms the outer surface of the tire, supports the load of the vehicle, and serves to alleviate external shocks due to the stretching motion.

In the bead part 40, ends of the first carcass ply 61 and the second carcass ply 65 of the carcass ply 60 are turned up to surround the bead wire 41 and the Afax 42. It is installed to be attached.

On the other hand, the turn-up portion 61a of the first carcass ply 61 is formed so as to cover part of the side wall portion 30 adjacent to the bead portion 40, and the turn-up end of the second carcass ply 65 is covered. 65a is extended so that the turn-up part 61a of the 1st carcass ply 61 may be covered.

The bead wire 41 serves as a skeleton for fixing and fixing the tire to the rim with a wire bundle coated with steel wire with rubber.

In addition, the afax 42 has a right-sided shape that gradually decreases in width from the bead wire 41 toward the upper side, thereby preventing the dispersion of the bead wire 41 and alleviating the impact, and forming the bead portion 40 during molding. To prevent air intake.

The AFA 42 applied in this embodiment is thin so that the weight of the tire can be reduced. Illustrates that it is a slim afax using a soft compound constituting this.

On the other hand, the pneumatic tire of this embodiment is interposed between the first carcass ply 61 and the A-fax 42 and the bead wire 41 in the bead portion 40, the upper portion of the upper part of the A-fax 42 It is configured to further include a bead reinforcement 100 to wrap and reinforce.

FIG. 2 is an enlarged cross-sectional view illustrating the bead portion of the pneumatic tire of FIG. 1.

Referring to FIG. 2, the cross-sectional shape of the bead reinforcement 100 in the present embodiment mainly extends to be interposed between the first carcass ply 61 and the inner surfaces of the Afax 42 and the bead wires 42. Is formed. Then, the upper end portion 101 is bent outwardly to surround the upper part of the A-Fax 42 so that the outer surface of the A-Fax 41 is partially opened, and the lower end 102 is folded up to the outside while wrapping the bead wire 41. It is configured to be attached to a lower portion of the outer faucet 41.

As such, the bead reinforcement 100 wraps and reinforces the upper end of the AFAX 42 which becomes thinner gradually from the bead wire 41 to the upper side, thereby preventing the upper end of the AFAX 42 during the molding process of the tire. Thus, the work efficiency of the molding process can be improved, and it is possible to prevent the durability of the airflow from occurring on the interface with the first carcass ply 61.

On the other hand, although not shown in Fig. 2, the outer opening portion 42b of the A-FAX can be applied to the refurbished reinforcing bead and the like.

Therefore, it is preferable that the upper end portion 101 wrapped around the upper end of the A-Fax 42 of the bead reinforcing material 100 does not overlap the upper end of the above-mentioned hopper and the sample wave. At this time, the length of the portion of the bead reinforcing material 100 wrapped around the Afax 42 upper end 42a to the outside is formed within the range of 5mm to 10mm.

Here, when the length h1 of the portion 101 surrounding the A-Fax 42 upper part 42a of the bead reinforcing material 100 is less than 5 mm, not only the top of the A-FAX 42 can not be sufficiently reinforced, but also a hopper Alternatively, the separation distance between the upper end of the chevron and the tire may be reduced.

In addition, when the length h1 of the portion surrounding the AFAX 42 upper end 42a of the bead reinforcement 100 is more than 10 mm, the upper end of the bead reinforcement 100 partially overlaps with the upper end of the hopper and the soak. The uniformity of the tire is reduced.

On the other hand, the refurbisher and body wave used for a general pneumatic tire usually have a thickness of 0.08 mm. Therefore, the thickness of the bead reinforcement 100 is preferably made within the range of 0.06mm to 0.1mm in consideration of the uniformity of the tire.

Therefore, when less than 0.6mm or more than 0.1mm, the portion 101 wrapped around the upper part of the A-fax in the bead reinforcement 100 and the portion wrapped up the bead wire 41 are separated by the thickness difference between the hopper and the body wave. It will reduce the uniformity of the tire.

On the other hand, it is preferable that the length h2 of the portion 102 in which the bead reinforcement 100 surrounds the bead wire 41 extends longer than the side width h3 of the bead wire 41.

Accordingly, the lower end portion of the bead reinforcement 100 wraps and reinforces a portion in contact with the upper end of the bead wire 41 and the APAX 42, so that the overall durability of the bead portion 40 may be improved, and thus the steering performance of the tire while driving. Has the effect of improving the.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention. And it goes without saying that they belong to the scope of the present invention.

1 is a side cross-sectional view of a pneumatic tire according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view illustrating the bead portion of the pneumatic tire of FIG. 1.

<Description of Main Reference Signs>

10: tread portion 20: shoulder portion

30: side wall part 40: bead part

41: bead wire 42: A fax

60: carcass fly 61: first carcass fly

65: second carcass fly 61a: first carcass fly turn-up part

65a: second carcass fly turn-up unit 100: bead reinforcement

101: bead stiffener upper end 102: bead stiffener lower end

Claims (5)

Shoulder parts, side wall parts, and bead parts are formed on both sides of the tread part in the tire width direction, respectively. In the pneumatic tire that is attached to the tread portion, the shoulder portion, the side wall portion, and the end of the carcass ply extending extending inside the bead portion wrapped around the bead wire and afax in the bead portion, The bead portion, A pneumatic tire interposed between the carcass ply and the A-fax and the bead wire, the upper portion of the pneumatic tire including a bead reinforcement wrapped around the upper end of the A-fax. In claim 1, The bead reinforcement, A pneumatic tire, wherein a lower portion of the A-fax is extended to be bent and wrapped around the bead wire so that a part of the outer surface of the A-fax is opened. In claim 2, It includes a hopper and a sample wave attached to the outside portion of the A-fax, And a pneumatic tire in which the upper end of the bead reinforcement is not overlapped with the upper end of the refurbished and the sample wave. 4. The method of claim 3, The pneumatic tire including the length of the upper end portion wrapped around the top of the bead reinforcement and bent outwards in the range of 5mm to 10mm. In claim 4, The thickness of the bead reinforcement is pneumatic tire made within the range of 0.6mm to 0.1mm.

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