KR19990047617A - Pneumatic tires for passenger cars and light trucks - Google Patents

Abstract

The present invention relates to pneumatic tires for passenger cars and low-weight trucks, and more particularly, to high-end materials and fiber cords with cap ply codes for durability and reduction of tire weights for passenger cars and low-weight truck tires. It relates to a pneumatic tire to which an aramid cord is applied.

An object of the present invention is to provide a pneumatic tire for passenger cars and low weight trucks of high durability and low weight using aramid cord as a cam fly cord material.

The present invention is characterized in that the pneumatic tires for passenger cars and low-weight trucks used by winding the rolled product rubber rolled to 0.8 ~ 1.2mm in aramid cord 1-2 times.

Description

Pneumatic tires for passenger cars and light trucks

The present invention relates to pneumatic tires for trucks and low-weight trucks, and more particularly to the durability and durability of the tires for passenger cars and low-weight trucks, and to high-weight materials and fiber cords with a capply code. It relates to a pneumatic tire to which an aramid cord is applied.

In general, one of the major accidents for passenger cars and low-weight truck tires is that the belt is made of steel cord, so that the belt is peeled off due to high centrifugal force when driving. Therefore, the cap fly is applied to improve the tire durability by fixing the belt.

These cap plies are used to increase the cam fly's strength as the high speed driving is applied. As a method for increasing the cap ply's strength, the cap plies are applied to multiple cap plies or to increase the cord array density.

Nylon-66 (NYLON-66) cord, which is mainly applied as a cap ply cord, has insufficient strength, so it is common to use a thick cord or to apply two or more cap plies.

Therefore, the tire weight is increased and the tire volume is turned on, which is disadvantageous to heat release, which is a factor of lowering durability.

Therefore, the present inventors found out that by changing the existing cam fly cord material to a high strength and fibrous aramid cord while conducting research to solve this problem, it was found that the durability and the tire weight could be reduced. The invention has been completed.

Accordingly, an object of the present invention is to provide a high durability and low weight passenger car and low weight truck pneumatic tire using an aramid cord as a cam fly cord material.

1 is a side configuration diagram of a pneumatic tire according to the present invention.

Figure 2 is a cap ply side cross-sectional view of the pneumatic tire according to the present invention.

Figure 3 is a side configuration diagram of a pneumatic tire according to the prior art.

Figure 4 is a cap ply side cross-sectional view of a pneumatic tire according to the prior art.

* Explanation of symbols for main parts of the drawings

1: capfly 2: aramid cord

3: belt 4: rubber

11: cap fly 22: nylon-66 cord

44: rubber

The pneumatic tire according to the present invention is characterized by applying an aramid cord, which is a strong material and a fiber cord, as a capply cord for durability and weight reduction of a passenger car and a low weight truck tire. Rubber rolled rolls are wound once or twice with cap plies to be used for tire production.

The properties of conventional nylon-66 cord and aramid cord are summarized in Table 1. As shown in Table 1, aramid cord, which is the same cord thickness, is about twice as strong as nylon-66.

Therefore, the application of aramid cord to the cam fly has the following advantages.

First, when the aramid cord of the same thickness as the existing nylon-66 is applied, the strength of the cam fly is greatly increased and the durability is improved.

Second, in the case of high-speed driving tires using two existing nylon-66 cap plies, one aramid cap ply can be applied to one piece, which reduces tire thickness and is advantageous for heat dissipation, improving durability and saving weight. Savings.

Third, when the aramid cord is applied to the cord less cord than the existing nylon-66 cord can be applied for durability improvement and tire weight is reduced.

[Table 1. Comparison of properties of nylon-66 cord and aramid cord]

The present invention will be described in more detail with reference to the following examples and comparative examples. However, the present invention is not limited to these examples.

Example 1

The rolled material rolled with 1.0mm on aramid cord of 1000D / 2P 22EPI standard was rolled once with a cap ply to manufacture pneumatic tires of 185 / 60R14 standard as shown in FIG. Table 2 shows.

Durability was measured by the speed weight endurance evaluation (ECER-30 VR SPEED) method, the weight is a value of the weight of the tire according to the prior art (comparative example) to 100.

Example 2

Table 2 shows the results of measuring the durability and weight of the tire in the same manner as in Example 1 except that the cap ply was wound twice to produce a pneumatic tire.

[Comparative Example]

Rolled rolled rubber rolled to 1.0mm on nylon-66 cord of 840D / 2P 22EPI with cap ply twice to manufacture pneumatic tire of 185 / 60R14 standard as shown in FIG. Table 2 shows the results of measuring durability and weight.

[Table 2. Durability and Weighing Results]

As shown in Table 2, the pneumatic tires for passenger cars and low-weight trucks according to the present invention have improved durability and reduced weight by using aramid cords as compared to pneumatic tires using conventional nylon-66 cords.

Claims (2)

Pneumatic tires for wagons and light trucks with aramid cord made of capply cord material. The method of claim 1, Cappray cord is a pneumatic tire for passenger cars and low-weight trucks, characterized in that the rolled product is rolled by rubber with 0.8 to 1.2mm of aramid cord.