KR20040061326A - Radial tire with reinforced side for truck and bus - Google Patents

Abstract

PURPOSE: A radial tire for a truck and a bus with a reinforced side is provided to reinforce a side part, a shoulder part, and a bead part by inserting a waved steel cord into the outside of a carcass cord layer. CONSTITUTION: In a tire for a truck and a bus, a steel cord(1) is formed on the outer surface of a body ply(6). One end of the steel cord is formed between a base strip(12) and the body ply and the other end of the steel cord is formed between the body ply and the apex. One end of the steel cord leaves a space of 10¯15 mm toward a first belt layer from the end of a second belt layer and the other end leaves a space of 20¯30 mm toward a bead from the upper end of the bead.

Description

Radial tire with reinforced side for truck and bus}

The present invention relates to a radial tire for trucks and buses, and more particularly, to a radial tire for trucks and buses with enhanced durability to the side of the tire.

Said side is a shoulder part, a side part, and a bead part which are side parts of a tire.

In general, the tire is a rubber layer attached to the inside of the tire as shown in FIG. 2, an inner liner rubber layer 5 for protecting the cord and preventing water absorption, and a cord layer inside the tire to support a load, to withstand shock, and to move while driving. A carcass cord layer (also referred to as a 'body ply') (6), which must be resistant to fatigue, and a belt cord layer between the tread rubber layer (8) and the carcass cord layer (6). 7), the tread rubber layer 8 which is in direct contact with the road surface, the side wall 13 which should improve the ride and have a good appearance by protecting the carcass cord layer 6 by the side of the tire and flexing. Is done.

The belt cord layer 7 includes four belt cord layers (hereinafter, 'first belt cord layer' 7_a, 'second belt cord layer' 7_b, and 'third belt' in order of being close to the carcass cord layer). Code layer '7_c', 'fourth belt code layer (7_d)') to strengthen the tread and minimize the increase in flexural function. Reference numeral 2 is a shoulder part, 3 is a side part, 4 is a bead part, 9 is a groove, 10 is an apex, 11 is a bead, 12 is a base strip, and 13 is a side wall.

Although not exactly shown in the figure, the body fly cord used in the side part according to the related art is arranged in a radial direction.

The carcass cord layer is located between the inner liner, the first belt cord layer, the sidewall and the apex in position, and does not cause any problem in use in a good road condition, but in a construction site where the road condition is poor. The impact and cutting caused cracks in the radial direction, resulting in a problem of shortening tire life.

Accordingly, an object of the present invention is to insert a waved steel cord on the outer side of the carcass cord layer to reinforce the durability of the side portion, the shoulder portion, and the bead portion.

1 is a cross-sectional view of a radial tire for a truck and a bus according to the present invention.

2 is a cross-sectional view of a radial tire for a truck and a bus according to the prior art.

※ Explanation of symbols about main part of drawing ※

1: Steel cord 2: Shoulder

3: side part 4: bead part

5: inner liner rubber layer 6: carcass cord layer (body ply)

7: belt cord layer 7 _ a: first belt cord layer

7 _ b: second belt code layer 7 _ c: third belt code layer

7 _ d: fourth belt cord layer 8: tread rubber layer

8 ': under tread rubber layer 9: groove

10: Apex 11: Bead

12: base strip 13: side wall

A: spacing of 10 to 15 mm from the third belt cord layer toward the second belt cord layer

B: 20 to 30 mm from the top of the apex toward the bead

P: upper part of Apex

The present invention for achieving the above object is a radial tire for trucks and buses,

The steel cord is formed in contact with the outer surface of the body fly,

One end is formed between the base strip and the body fly, and the other end is formed between the body fly and the apex.

The steel cord is preferably a wavy steel cord. The reason for the wave shape is that the wave-shaped surface has better shock absorption than the flat surface, and also prevents the body fly from tearing easily when an external force is given in a direction perpendicular to the body fly cord direction. .

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

1 is a cross-sectional view of a radial tire for a truck and a bus according to the present invention. As shown in FIG. 1, the present invention provides a carcass cord layer (body fly) 6, a belt cord layer 7, a tread rubber layer 8, an apex 10, a base strip 12, and a sidewall 13. In the radial tires for trucks and buses comprising:

Steel cord (1) is formed in contact with the outer surface of the body fly (6),

One end is formed between the base strip 12 and the body ply 6, and the other end is formed between the body ply 6 and the apex 10.

One end of the steel cord 1 is preferably formed between the base strip 12 and the body fly 6, which is 10 to 15 mm from the end of the second belt layer towards the first belt layer.

The other end of the steel cord 1 is preferably formed between the apex 10 and the body ply 6 which are 20 to 30 mm from the apex upper end P toward the bead 11.

Reference numeral A denotes an interval of 10 to 15 mm from the third belt cord layer toward the second belt cord layer, and B denotes an interval of 20 to 30 mm from the apex upper end to the bead.

The steel cord 1 is wavy and has a thickness of 0.2 to 0.5 mm.

As described above, the steel cord 1 is formed between the body ply 6 and the base strip 12, the body ply 6 and the side wall 13, and the body ply 6 and the apex 10. The durability of the part 2, the side part 3, and the bead part 4 was improved.

In addition, the separation of the first belt layer 7_a and the second belt layer 7_b by inserting the steel cord 1 up to the end of the first belt layer 7_a of the base strip 12 as described above. ) Is prevented.

By configuring as described above, the resistance to the impact and damage in the radial direction under poor road surface and the resistance to external force applied to the side part are further improved, thereby improving tire life.

Claims (3)

In radial tires for trucks and buses, The steel cord is formed in contact with the outer surface of the body fly, A radial tire for trucks and buses, wherein one end is formed between the base strip and the body fly, and the other end is formed between the body fly and the apex. According to claim 1, wherein one end of the steel cord is a point of 10 to 15mm from the end of the second belt layer toward the first belt layer, the other end of the steel cord is characterized in that 20 to 30mm point from the top of the bead towards the bead Radial Tires for Trucks and Buses. The radial tire of claim 1, wherein the steel cord is wavy and has a thickness of 0.2 to 0.5 mm.