Pneumatic radial tire for car

一种子午线轮胎、乘用车的技术，应用在充气轮胎的增强层、车轮、轮胎零部件等方向，达到抑制突出和软化现象、提高操纵稳定性的效果

Inactive Publication Date: 2008-01-23
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even in cords produced by this method, there is still room for improvement in fatigue resistance (see JP-U-63-19581)

Method used

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  • Pneumatic radial tire for car
  • Pneumatic radial tire for car
  • Pneumatic radial tire for car

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0068] The following examples are given to illustrate the present invention, and the present invention is not limited by the examples.

[0069] A pneumatic radial tire for passenger vehicles (tire size: 195 / 65R15) was prepared by using a carcass ply of the material, structure and properties shown in Table 1.

[0070] (Stability during actual operation at high speed)

[0071] The performances of the pneumatic radial tires for passenger vehicles in Examples 1-3 and Comparative Examples 1-2 were evaluated. This test was conducted by running the vehicle on a test course with one lap of 4 km to evaluate four performances including straight-line running stability, steering stability, feeling of rigidity, and handling performance. Each test result was evaluated using a 10-point method, where the larger the value, the better the performance. Table 1 shows the results.

[0072] Table 1

[0073] Comparative example 1

Comparative example 2

Example 1

Example 2...

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PUM

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Abstract

The present invention relates to a pneumatic radial tire for passenger vehicles comprising a pair of bead portions and a carcass extending helically between a pair of bead cores respectively embedded in the bead portions and comprising Composed of at least one carcass ply of organic fiber cords, characterized in that the organic fiber cords constituting the carcass ply are polyketone fiber cords satisfying the following formula (I): σ≥-0.01E+1.2 and σ ≥0.02 (I) [wherein, σ is the thermal shrinkage stress (cN / dtex) at 177°C; E is the modulus of elasticity (cN / dtex) at 25°C under a load of 49N], polyketone fiber cord It has a primary twist coefficient N1 of 0.35 to 0.70 defined by the following formula (II) and a double twist coefficient N2 of 0.50 to 0.95 defined by the following formula (III): N1=n1×(0.125×D1 / ρ)1 / 2× 10-3 (II) N2=n2×(0.125×D2 / ρ)1 / 2×10-3 (III)[In the formulas (II) and (III), n1 is the number of first twists (number of times / 10cm), n2 is the number of double twists (number of times / 10cm), D1 is the dtex of the initially twisted yarn, D2 is the total dtex, and ρ is the specific gravity (g / cm3) of the polyketone cord].

Description

technical field [0001] The present invention relates to a pneumatic radial tire for passenger cars, and more particularly to a pneumatic radial tire for passenger cars that improves high-speed durability and handling stability by using organic fibers having excellent mechanical properties and high thermal shrinkage properties Radial tires. Background technique [0002] In the carcass of conventional pneumatic tires, organic fiber cords such as rayon, nylon, polyester, etc. are generally used as reinforcing cords. However, since these organic fiber cords have low initial stretch resistance, when these cords are used in a tire carcass, there is concern about cord deformation due to stretching during use of the tire. Therefore, the tire has a possibility of deteriorating running performance, and there is a problem that it is difficult to use under stricter conditions such as ultra-high-speed running. [0003] As a cord having high initial stretch resistance, a cord made of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/00D02G3/02D02G3/28D02G3/48
CPCD02G3/48B60C9/0042B60C9/08Y10T152/10513
Inventor 赤羽秀信横仓宏行
Owner BRIDGESTONE CORP
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