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Pneumatic tire for passenger cars

A technology for pneumatic tires and vehicles, applied to the reinforcement layer of pneumatic tires, vehicle parts, tire parts, etc., can solve problems such as damage to steering stability, difference in steering force, oversteer, etc., to reduce load dependence, reduce The effect of small load dependencies

Active Publication Date: 2017-09-08
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the case of using such a reinforcement structure, there is a problem in load dependence so that a difference occurs in the degree of steering force obtained depending on the degree of tire load
For example, in the case of installing pneumatic tires with the aforementioned reinforced structure on a small FF vehicle, the load on the front wheels of this vehicle is very different from that on the rear wheels, and the steering force obtained on the front wheels is significantly greater than that obtained on the rear wheels. steering forces, so for example problems with oversteering and a tendency to destabilize the steering during cornering

Method used

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  • Pneumatic tire for passenger cars
  • Pneumatic tire for passenger cars
  • Pneumatic tire for passenger cars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The tire of Example 1 has a tire size of 225 / 50R17, and includes a main belt formed of two slanted belt layers (first and second slanted belt layers) in which cords cross each other between layers, and sets A reinforcing belt on the outer side in the tire radial direction of the main belt. In addition, the reinforcing belt is formed of a first circumferential belt layer and a pair of second circumferential belt layers, wherein the first circumferential belt layer is provided spanning from the tire equatorial plane of the tread portion to the shoulder side, and a pair of second circumferential belt layers The second circumferential belt layer is provided outside the first circumferential belt layer in the tire radial direction, on shoulders on both sides in the tire width direction of the tread portion, and separated from each other. In addition, the thicknesses, etc., of the shoulder portion and the center portion between the cords of the two inclined belt layers are as...

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Abstract

The purpose of the present invention is to provide a pneumatic tire for passenger cars such that the load dependency of cornering force can be sufficiently reduced. This pneumatic tire for passenger cars has a tread portion that is equipped with a main belt that comprises at least two inclined belt layers each formed from a rubberized layer of cords extending so as to be inclined with respect to the circumferential direction of the tire, and a reinforcing belt that is disposed outward of the main belt in the radial direction of the tire and comprises at least one circumferential belt layer formed from a rubberized layer of cords extending along the circumferential direction of the tire, wherein the main belt and the reinforcing belt are disposed so as to extend from the equatorial plane of the tire to shoulder portions of the tread portion. The pneumatic tire for passenger cars is characterized in that the thickness between the cords of the two adjacent inclined belt layers in the shoulder portions is larger than that in a center portion of the tread portion.

Description

technical field [0001] This invention relates to pneumatic tires for passenger vehicles. Background technique [0002] Generally, it is known to provide an inclined belt having cords inclined with respect to the tire circumferential direction on the tire radially outer side of a crown portion of a carcass spanning between bead portions as a reinforcing member of a pneumatic tire. [0003] Specifically, generally, sufficient steering force, which is an important index of steering stability, has been obtained by securing the tire width direction rigidity of the inclined belt. [0004] However, in the case of using such a reinforcement structure, there is a problem in load dependence so that a difference occurs in the degree of steering force obtained depending on the degree of tire load. For example, in the case of installing pneumatic tires with the aforementioned reinforced structure on a small FF vehicle, the load on the front wheels of this vehicle is very different from ...

Claims

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Application Information

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IPC IPC(8): B60C9/20B60C9/18
CPCB60C2009/2016B60C9/2009B60C2009/2038B60C9/22B60C2009/2019B60C2009/1842B60C9/185B60C9/18B60C9/20B60C15/06B60C2009/2012B60C2009/2032
Inventor 田代雄一
Owner BRIDGESTONE CORP
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