KR101091710B1

KR101091710B1 - Carcass code, and heavy duty pnumeric radial tire with the same

Info

Publication number: KR101091710B1
Application number: KR1020100048747A
Authority: KR
Inventors: 정영진
Original assignee: 금호타이어 주식회사
Priority date: 2010-05-25
Filing date: 2010-05-25
Publication date: 2011-12-08
Also published as: KR20110129227A

Abstract

The present invention relates to a carcass ply semifinished product of the present invention and a heavy-load pneumatic radial tire including the same, wherein an image of a carcass cord rubber-topped to a certain thickness in a carcass ply semifinished product forming a carcass ply layer of the pneumatic tire, Reinforcement using reinforcement cord which is arranged more closely downward, prevents the penetration of rubber generated between carcass cords while driving, and improves adhesive force and separation between carcass ply layer and side rubber layer It is effective to prevent the separation occurring at the turn-up part of the bead portion, and to improve the durability of the tire.

Description

Carcass fly semi-finished products and heavy-duty pneumatic radial tires manufactured using the same

The present invention relates to a heavy-duty pneumatic radial tire, and more particularly, to a carcass ply semi-finished product and a pneumatic tire manufactured by using the same to improve the durability of the tire and to prevent belt separation.

As is well known, the heavy-loaded pneumatic radial tire has a shoulder portion, a side wall portion, and a bead portion sequentially formed on both sides of the tread portion.

Inner liner, back-up liner, and carcass ply layers are stacked on the inside of the tread, shoulder, sidewall and bead portions of the pneumatic radial tire for heavy load. In particular, the tread portion is formed by sequentially laminating a belt layer, an under tread layer and a tread layer on a carcass ply layer.

The carcass ply semifinished product, which forms the carcass ply layer of the conventional heavy-duty pneumatic radial tire, forms a topping rubber up and down around the carcass cord at a predetermined interval to be subjected to repeated flexural load during driving. It has strengthened fatigue resistance.

However, since the carcass ply layer of the conventional heavy-duty pneumatic radial tire consists only of the carcass cord and the topping rubber covering the carcass cord, the carcass cord (Cord) is formed between the carcass layer and the sidewall by stress concentration and friction. The rubber layer penetrates between the shells, where a rubber crack occurs, which eventually separates from the carcass cord and the topping rubber or leads to separation at the adhesive side with the side rubber layer. Carcass Separation phenomenon has a problem that occurs.

Efforts have been made to increase the amount of rubber in the existing topping rubber or to change the properties of the topping rubber in order to solve the above-mentioned separation of the carcass separation. However, these efforts alone increase the speed and weight of the vehicle. And considering the driving environment there is a limit to apply.

An object of the present invention for solving the above problems, in the carcass ply semi-finished product forming the carcass ply layer of the heavy-duty pneumatic radial tire, it is arranged more densely up and down of the carcass cord rubber-topped to a certain thickness Reinforcement using reinforcement cord prevents the ingress of rubber between carcass cords while driving and improves adhesion to prevent separation between carcass ply layer and side rubber layer. To provide a carcass fly semi-finished product and a heavy-loaded pneumatic radial tire manufactured using the same, which prevents separation occurring at the turn-up part of the bead and improves the durability of the tire. .

The carcass ply semifinished product of the present invention for achieving the above object is a carcass ply semifinished product constituting the carcass ply layer of a heavy-duty pneumatic radial tire, wherein the carcass ply semifinished product is twisted with at least two cord strands Carcass code is made and spaced apart from each other having a first array density; And reinforcing cords having two to three cord strands twisted with each other and arranged with a second array density greater than the first array density on the upper and lower sides of the carcass cord. And a topping rubber covering the carcass cord and the reinforcement cord to form a layer at a predetermined interval.

Here, one cord strand diameter constituting the reinforcing cord is preferably within the range of 1.5 times to 1.8 times the diameter of one cord strand forming the carcass cord. In addition, the first array density of the carcass code may include a range of 15 EPI to 20 EPI. In addition, the second array density of the reinforcing cord may include a range of 20 EPI to 30 EPI.

In addition, the heavy-load pneumatic radial tire of the present invention for achieving the above object, in the pneumatic tire is provided with a carcass ply layer to act as a skeleton along the width direction of the tire, the carcass ply layer, At least two cord strands are twisted with each other, the carcass cord being spaced apart from each other with a first array density; And reinforcing cords comprising two to three cord strands, each having a second array density greater than the first array density on the upper and lower sides of the carcass cord.

Here, it is preferable that one cord strand diameter constituting the reinforcing cord is within a range of 1.5 times to 2.0 times the diameter of one cord strand forming the carcass cord. In addition, the first array density of the carcass code may include a range of 8 EPI to 13 EPI. In addition, the second array density of the reinforcing cord may include a range of 15 EPI to 20 EPI.

According to the carcass ply semifinished product of the present invention and a heavy-load pneumatic radial tire including the same, the upper and lower sides of the carcass cord rubber-topped to a certain thickness in the carcass ply semifinished product constituting the carcass ply layer of the pneumatic tire By reinforcing using reinforcement cords that are more closely arranged, it prevents the rubber from infiltrating between carcass cords while driving and improves adhesion to prevent the separation between carcass ply layer and side rubber layer. It prevents the separation occurring at the turn-up portion of the bead portion, and has an effect to improve the durability of the tire.

1 is a side cross-sectional view of a heavy-load pneumatic radial tire according to an embodiment of the present invention.
FIG. 2 is a side cross-sectional view of the carcass ply semifinished product forming the carcass ply layer of the heavy-duty pneumatic radial tire of FIG. 1. FIG.

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. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is a side cross-sectional view of a pneumatic radial tire for a heavy load according to an embodiment of the present invention.

Referring to FIG. 1, the pneumatic radial tire for a heavy load according to the present embodiment has a shoulder part 20 and a side wall part at both sides along the width direction of the tire with respect to the tread part 10 on which the tread 13 is formed. 30 and the bead part 40 are formed sequentially.

In the tread portion 10, the shoulder portion 20, the side wall portion 30, and the bead portion 40, a carcass ply 60, which serves as a skeleton of a tire, is stacked on the upper side of the inner liner 50. And extend along the width direction.

In the tread portion 10, the belt layer 11, the under tread layer 12, and the tread layer 13 are sequentially stacked on the carcass ply layer 60.

The carcass ply layer 60 is an inner cord layer serving as a skeleton of the pneumatic tire 1, and supports a load acting on the tire, and is configured to have fatigue resistance to flexing movement during driving when it bears an impact.

The belt layer 11 is a special coded paper positioned between the carcass ply layer 60 and the under tread layer 15 to mitigate external shocks, and the cracks or trauma generated in the tread layer 13 are carcass ply layers. To prevent direct transmission to (60).

The under tread layer 12 is used to increase the adhesion between the belt layer 11 and the tread worm 13, the tread layer 13 is a special rubber material having excellent wear resistance and cutting resistance as a part in direct contact with the road surface Is made of.

In the shoulder portion 20, the thickness gradually decreases, and is a shoulder portion connecting the tread portion 10 and the side wall portion 30.

The side wall part 30 covers and protects the carcass ply layer 60 with the side rubber layer 31 forming 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, the end of the carcass ply layer 60 is turned up so as to surround the bead wire 41 and the apex 42. On the other hand, the turn-up end of the carcass ply layer 60 is formed so as to cover a portion outside the side wall portion 30 adjacent to the bead portion 40.

The bead wire 41 serves to fix and fix the tire to the rim with a wire bundle coated with steel wire with rubber. And the apex 42 prevents the dispersion of the bead wire 41 and alleviates the impact, and prevents the occurrence of air in the bead portion 40 during molding.

Figure 2 is a side cross-sectional view of the carcass ply semifinished product of Figure 1;

Referring to FIG. 2, the carcass ply layer 60 is formed by attaching the carcass ply semifinished product 600 to cover the upper side of the inner liner 50 in the process of forming a pneumatic tire.

The carcass ply semifinished product 600 comprises a carcass cord 610, a reinforcing cord 620, and a topping rubber 630.

Carcass cord 610 is at least two or more cord strands are twisted with each other, are spaced apart from each other with a first array density (EPI) are arranged side by side.

In the present embodiment, the carcass code 610 has a plurality of cord strands twisted together to form a single cord, and the first array density (EPI) of each carcass code 610 is in the range of 8 EPI to 13 EPI. Illustrate that is within.

Here, when the first array density of the carcass code 610 is 8 EPI, there is a problem in durability against high loads, and when the first array density of the carcass code 610 is greater than 13 EPI, the rubber volume decreases around the cord, and the rubber volume (Volume) decreases, there is a problem such as adhesion and durability deterioration.

The reinforcement cords 620 are arranged with the second array density EPI greater than the first array density EPI above and below the carcass cord 610, respectively.

In the present embodiment, the diameter d2 of one cord strand 621 constituting the reinforcing cord 620 is within a range of 1.5 times to 2.0 times the diameter of one cord strand 611 constituting the carcass cord 610. The second array density is shown to be arranged in the same direction more closely than the carcass code 610 described above within the range of 15 EPI to 20 EPI.

Here, when the diameter d2 of one cord strand 621 constituting the reinforcing cord 620 is less than 1.5 times the diameter d1 of one cord strand 611 constituting the carcass cord 610, the reinforcing cord 620 ) Diameter is too small to reduce the reinforcement strength for reinforcing the carcass cord 610, if the diameter is greater than 2.0 times the diameter of the reinforcement cord 620 is too large has the disadvantage of lowering the adhesive strength between the cords.

In addition, when the second array density (EPI) of the reinforcement cords 620 is less than 15EPI, the reinforcement of the first array cord is inferior, and when the reinforcement cords 620 are greater than 20EPI, problems such as reduction of rubber volume and weight increase occur. .

Therefore, the carcass ply semi-finished product 600 topping the rubber so that the carcass cord 610 and the reinforcement cord 620 is spaced apart from each other at a predetermined interval, and then through the rolling process topping rubber 610 ) Is completed.

As described above, the heavy-duty pneumatic radial tire 1 in which the carcass ply semi-finished product 600 is applied to the carcass ply layer 60 is formed on the upper and lower sides of the carcass cord 610, respectively. By densely arranging and reinforcing more than the carcass cord 610, it is possible to prevent the penetration of the rubber generated between the carcass cord 610 during driving.

In addition, the adhesion of the carcass ply layer 60 may be improved to prevent separation occurring between the carcass ply layer 60 and the side rubber layer 31.

In addition, it is possible to prevent separation occurring at the bead-turn-up portion of the carcass ply layer 60 and to improve durability of the tire.

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: pneumatic tire 10: tread portion
11: belt layer 12: under tread layer
13: tread layer 20: shoulder portion
30: side wall part 31: side rubber layer
40: bead part 41: bead wire
50: inner liner 60: carcass fly layer
600: carcass ply semi-finished product 610: carcass code
611: cord strand 620: reinforcement cord
630: topping rubber

Claims

In the carcass ply semifinished product which forms the carcass ply layer of the heavy-duty pneumatic radial tire,

The carcass fly semi-finished product,
At least two cord strands are twisted with each other, the carcass cord being spaced apart from each other with a first array density; And
A reinforcing cord having two to three cord strands twisted with each other and arranged with a second array density greater than the first array density on the upper and lower sides of the carcass cord; And
A carcass ply semifinished product comprising topping rubber covering the carcass cord and the reinforcing cord to be layered at regular intervals.

In claim 1,
One cord strand diameter constituting the reinforcement cord is within the range of 1.5 times to 2.0 times the diameter of one cord strand constituting the carcass cord.

In claim 2,
The carcass ply semifinished product comprising the first array density of the carcass code is in the range of 8 EPI to 13 EPI.

4. The method of claim 3,
Carcass ply semifinished product comprising the second array density of the reinforcing cord is in the range of 15 EPI to 20 EPI.

In the heavy-load pneumatic radial tire provided with a carcass ply layer to act as a skeleton along the width direction of the tire

The carcass fly layer,
At least two cord strands are twisted with each other, the carcass cord being spaced apart from each other with a first array density; And
Heavy load pneumatic radial pneumatics comprising two to three cord strands intertwined with each other, the reinforcing cords arranged above and below the carcass cord and having a second array density greater than the first array density, respectively. tire.

In claim 5,
The diameter of the reinforcement cord is a heavy-duty pneumatic radial tire comprising a range of 1.5 times to 2.0 times the diameter of one cord strand constituting the carcass cord.

In claim 6,
And a first arrangement density of the carcass code is within a range of 8 EPI to 13 EPI.

In claim 7,
And a second array density of the reinforcement cord is in the range of 15 EPI to 20 EPI.