KR100798978B1 - Radial Tire For Passenger Car - Google Patents

Abstract

The present invention relates to a radial tire for a passenger car, by fixing the first belt layer in a ring shape by using an end portion of the second belt layer to prevent friction between the belt layers, thereby reducing heat generation. And when the material of the first belt layer is replaced with nylon or fabric cord, it is possible to omit the base strip to prevent the friction between the carcass layer and the belt layer, remove the wing strip and the under tread side of the belt It extends to be in direct contact with the side wall, it is possible to omit the cap fly and wing strip. Therefore, by forming the second belt layer in the shape of a ring, the belt layers are fixed to each other, thereby reducing the generation of heat and eliminating the need for installing cap plies, wing strips and base strips. The weight can be reduced.

Shoulder, rupture, radial tire, tire belt, tire cord

Description

Radial Tire For Passenger Car

1 is a cross-sectional view showing a cross section of a conventional radial tire for a pneumatic passenger car.

2 is a cross-sectional view showing a radial tire for a pneumatic passenger car according to the present invention.

3 is an enlarged cross-sectional view of a belt edge portion and a shoulder portion 80 of a radial tire for a pneumatic passenger vehicle according to the present invention.

4 is an enlarged cross-sectional view of an existing tire of a belt edge portion and shoulder portion 80 of a pneumatic radial tire for a passenger car and a tire according to the present invention.

 <Explanation of symbols for the main parts of the drawings>

10: side wall

20: cap tread

30: under tread

40: base strip

50: capply

60: first belt layer

70: second belt layer

80: shoulder part

90 carcass

100: inner liner

110: wing strip

120: bead

130: apex

140: ring-shaped terminal structure of the second belt layer

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radial tire for a passenger car, and in particular, to reduce heat generated at the edge of the belt and to disperse quickly, thereby preventing the tear of the shoulder unit 80 due to frequent friction between the belt and the belt. It is about a radial tire.

Generally, a radial tire for a passenger car, as shown in FIG. 1, has a tread in direct contact with a road surface, and a shoulder portion 80 positioned at the side of the tread and dissipating heat generated inside the tire while driving. (shoulder part), a side wall (10) which forms a side of the tire to improve ride comfort, and a carcass positioned under the tread and absorbing the impact of the stretching movement during driving and supporting the load ( A belt layer having a multilayer structure positioned between the tread and the carcass to reduce road impact during driving and to widen a tread contacting the road surface, thereby improving driving stability; A cap ply 50 attached to the belt to improve running performance and to prevent the belt from being detached, and a heat generated from the belt located at an upper end of the sidewall from the end of the tread. The wing strip 110 (wing strip) to be discharged to the negative, the end of the carcass 90 is wound and the iron core bead (120) (bead) to combine the tire and the rim (rim), and the side wall ( 10 is positioned between the lower end of the bead 120 and the apex 130 (apex) to protect the bead 120 by minimizing the dispersion of the bead 120 and to mitigate external impact.

The tread consists of a cap tread 20 that is in contact with the road surface and a grooved under tread 30, and a base strip is inserted between the lower end of the under tread 30 and the side wall 10. have. The belt is composed of the first belt layer 60 on the carcass 90 side and the second belt layer 70 on the tread side, and the cap ply 50 is fixed to prevent separation and separation of the two belt layers. do. That is, the cap ply 50 has a structure covering the ends of the first belt and the second belt, preventing separation and separation of the first belt and the second belt, the upper end and the tread of the side wall (10) Heat generated from the belt is discharged to the outside through the wing strip 110 inserted therebetween to prevent the belt from rupturing.

  However, a conventional radial tire for a passenger car generates heat due to friction between parts in the shoulder portion 80 of the tire, which is a belt edge part, while the vehicle is running, and this heat is not well dispersed and the shoulder of the tire when the tire is used for a long time. It caused the rupture of the part 80. The belt layer of the conventional tire is composed of the first belt layer 60 and the second belt layer 70 to reduce the road impact during driving and widen the tread portion to contact the road surface. In the structure of a conventional radial tire for a passenger car, the edge portion of which is fixed by the cap ply 50, even though the belt layer is fixed by the cap ply 50, heat generated by friction between the belt layers is generated by the shoulder portion ( 80) there is a problem that causes the rupture. In particular, when the material of the belt layer is the same as the steel cord (steel cord), the heat generated by the friction is further increased. The cause of the heat generation, the tread portion is an elastic material that is easily changed in the form of external impact, but the inner belt layer is made of a cord layer made of steel wire, so that deformation such as the tread layer is impossible, The impact of is deformed due to heat generation by internal friction.

  The present invention has been proposed to solve the above problems, by minimizing the friction between the belt and the belt of the radial tire to prevent the tear of the shoulder portion 80 by dispersing the heat generated inevitably, tire It is an object of the present invention to provide a radial tire for a passenger car having a ring-shaped belt structure that prevents tearing of the shoulder portion 80 and improves durability.

In order to solve the problems of the conventional radial tire for a passenger car, the present invention, a tread in direct contact with the road surface, a shoulder portion which is located on the side of the tread and dissipates heat generated inside the tire during driving, and the tire A side wall that forms a side to improve ride comfort, a carcass positioned under the tread and absorbing the impact of the stretching movement during driving and supporting a load, and positioned between the tread and the carcass to reduce road impact during driving. A multi-layered belt that widens the tread portion in contact with the road surface and improves driving stability, an iron core bead wound around the end of the carcass and joining the tire and the rim, and between the lower end of the sidewall and the bead. To minimize the spread of beads and mitigate external shocks In a radial tire for a passenger car, the belt comprises a first belt layer on the carcass side and a second belt layer larger than the width of the first belt layer on the upper side thereof, and an end of the second belt layer is looped. It is formed in a shape to surround the end of the first belt layer, the tread is composed of a cap tread and the under-tread of the lower, so that the under-tread extends to the side of the belt to directly contact the side wall It is characterized by one.

In the above configuration, the cord diameter of the second belt is preferably larger than the cord diameter of the first belt.

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In addition, the cap tread preferably extends to a position in direct contact with the upper end of the side wall.

Hereinafter, the configuration and operation of a real tire for a passenger car having a ring-shaped belt structure according to the present invention will be described in more detail through examples.

 As shown in FIG. 1, in a conventional radial tire for a passenger car, the width of the first belt layer 60 is generally wider than the width of the second belt layer 70, but in the present invention, the distal end portion of the first belt layer 60 is used. Since the structure is inserted into the annular structure of the second belt layer 70, the width of the first belt layer 60 is smaller than the width of the second belt layer 70. As shown in FIG. 2, the present invention fixes the belt layer in such a manner that the second belt layer 70 surrounds the first belt layer 60. At this time, since the second belt layer 70 is formed in a ring shape to form a structure surrounding the first belt layer 60 at both end portions, the diameter of the cord of the first belt layer 60 is a conventional radial for passenger cars. The smaller diameter of the cord of the first belt layer 60 of the tire is preferable because the thickness of the tire cord layer can be prevented from becoming too thick at the edge portion.

As shown in FIG. 1, in the case of a conventional radial tire for a passenger car, a base strip 40 is inserted in the lower surface of the first belt layer 60 to prevent friction between the first belt layer 60 and the carcass 90. However, in the present invention, as shown in FIG. 2, the first belt layer 60 is made of a carcass 90 and the material of the first belt layer 60 is made of nylon or fabric instead of steel cord. Even if directly in contact with the carcass 90 and the first belt layer 60, the friction is not large, it is not necessary to install the base strip 40 to reduce the friction.

In the present invention, the inner liner 100 is difficult to pass air inside the carcass 90 and the bead 120 core is installed inside the bead portion of the tire having a structure to absorb the impact to increase the rigidity The same thing as a conventional tire.

Therefore, the present invention does not mean a structure limited to the embodiment as shown in FIG. 2 and may be applied unless the belt layer is a single case. That is, if the belt layer at the top has a structure that wraps the end of the belt layer installed at the lower portion in a ring shape, it is possible to prevent the movement between the belt layers causing friction between the belt layers without using a separate cap ply 50. The belt layer can be secured to In addition, the ring structure of the second belt layer 70 surrounds and fixes the first belt layer 60 even when the cap fly 50 installed to support the edge portion of the belt layer is removed from the conventional radial tire for a passenger car. The structure can prevent separation and separation of the belt layer.

In the existing invention, the heat generated in the belt layer was dissipated to the outside through the wing strip 110, but in the present invention, since the friction between the belt layers is reduced, the wing strip 110 may be separately tread and side in some cases. It is also possible to manufacture a radial tire for a passenger car in which the undertread 30 extends to the side of the belt and directly contacts the side wall 10 without being installed between the walls. The belt layer of the existing tire has a multi-layered structure made of steel cord paper with high rigidity in order to minimize the movement of the tread rubber forming the part contacting the road surface, to increase the wear resistance of the cord material of the belt and to prevent the rapid deformation of the center of the tire. The sidewall is formed on the side of the tire to protect the carcass 90, and the base strip minimizes the friction of the steel cord between the carcass 90 and the first belt layer 60 for overall performance. It is formed of the basic components of the.

However, in the present invention, the ring-shaped structure of the second belt is made of steel cord, but the cord of the first belt layer 60 uses nylon cord or fabric cord to reduce friction between belt layers made of conventional steel cord. In addition, it forms a structure to prevent the separation and separation between the second belt and the first belt. In addition, since the material of the first belt layer 60 is a conventional radial tire, the cord is made of steel cord, so that the base strip is prevented not only from friction between the belt layers but also from friction between the first belt layer 60 and the carcass 90. The layer is further inserted between the first belt layer 60 and the carcass 90 layer.

However, in the present invention, if the material of the first belt layer 60 is made of nylon or fabric material instead of steel cord paper, there is no need to separately install the base strip layer on the carcass 90, so there is no difference in performance and cost. There are even savings.

According to the present invention, the upper second belt layer of the radial tire for a passenger car is fixed in such a manner as to wrap the end of the first belt layer in a ring shape to prevent friction between the belt layers due to the movement of the belt layer during driving of the vehicle. It can reduce heat generation by In addition, by forming the second belt layer in the shape of a ring, the belt layers are fixed to each other, thereby reducing the generation of heat caused by friction and eliminating the need for installing cap plies, wing strips and base strips, thereby reducing production costs and the total weight of the tire. Can be reduced.

Claims (4)

A tread in direct contact with the road surface, a shoulder portion positioned at the side of the tread and dissipating heat generated inside the tire during driving, a side wall forming a side of the tire to improve ride comfort, and a lower portion of the tread; Carcass that absorbs the impact of flexion movement while supporting the load and supports the load, Multi-layered belt that is located between the tread and carcass to reduce the road impact during driving and to widen the tread portion in contact with the road surface to improve driving stability and And an apex that is wound between the end of the carcass and is formed between an iron core-shaped bead that combines the tire and the rim, and is disposed between the lower end of the sidewall and the bead to minimize the dispersion of the bead and mitigate external impact. In the radial tire for a passenger car to include, The belt is composed of a first belt layer on the carcass side and a second belt layer larger than the width of the first belt layer on the upper side thereof, and an end of the second belt layer is formed in a ring shape so that Has a structure surrounding the end, The tread is composed of a cap tread and an under tread below, wherein the under tread extends to the side of the belt so as to directly contact the side wall. The method of claim 1, Radial tire for a passenger car, characterized in that the cord diameter of the second belt is larger than the cord diameter of the first belt. delete The method according to claim 1 or 2, Radial tire for a passenger car, characterized in that the cap tread is extended to a position directly in contact with the upper end of the side wall.

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