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Pneumatic radial tire for use on passenger vehicle

A technology for radial tires and passenger cars, which is applied to the reinforcement layer of pneumatic tires, road car tires, special tires, etc., can solve the problems of increased tire weight, increased vehicle resistance, and excess tire load capacity, and achieves improved wetness. Effects of Pavement Performance and Rolling Resistance Performance

Active Publication Date: 2017-02-22
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the diameter and width of the tire leads to an increase in tire weight and air resistance, and thus increases vehicle resistance, and further, the load capacity of the tire becomes excessive

Method used

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  • Pneumatic radial tire for use on passenger vehicle
  • Pneumatic radial tire for use on passenger vehicle
  • Pneumatic radial tire for use on passenger vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] The tire of Example 1 is figure 1 The tire shown is a tire of size 165 / 60R19 and has the construction shown in Table 1. Furthermore, the tire of Example 1 was provided with two slanted belt layers in which belt cords obliquely cross each other in opposite directions with respect to the tire circumferential direction and a belt reinforcing layer. Three circumferential main grooves (circumferential main grooves with a groove width of 7.5 mm) were arranged on the face surface. In the tire of Example 1, the width of the tread surface in the tire width direction was 125 mm.

[0166] The tires of Example 2 to Example 4 were the same as the tire of Example 1 except that the structure was changed as shown in Table 1.

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Abstract

The purpose of the present invention is to provide a pneumatic radial tire for use on a passenger vehicle, the tire having a low width and a large diameter, wherein the tire has improved wet performance and rolling resistance performance. This pneumatic radial tire for use on a passenger vehicle is characterized in that, when the tire is assembled on a rim and the internal pressure is 250 kPa or greater: the ratio (SW / OD) between the tire cross-sectional width (SW) and the outside diameter (OD) (mm) is 0.26 or less when the tire cross-sectional width (SW) is less than 165 (mm); the tire cross-sectional width (SW) and the outside diameter (OD) (mm) satisfy the relational expression 2.135 * SW + 282.3 <= OD when the tire cross-sectional width (SW) is 165 (mm) or greater; the dynamic storage modulus (E') of the tread rubber at 30DEG C is 6.0 to 12.0 MPa; the loss tangent (tan[delta]) of the tread rubber at 60oC is 0.05 to 0.15; the dynamic storage modulus (E') of the buttress rubber at 30oC is 1 / 2 or less of the dynamic storage modulus (E') of the tread rubber; and the loss tangent (tan[delta]) of the buttress rubber at 60DEG C is 0.1 or less.

Description

technical field [0001] The present invention relates to a pneumatic radial tire for passenger vehicles. Background technique [0002] Due to the light weight of conventional vehicles built around 1960 and the lower cruising speeds required of the vehicles, the tires are less burdened. Therefore, bias tires with narrower tire section widths are used. However, currently, as vehicles become heavier and faster, tires have had radial structures and wider widths (for example, Patent Document 1). [0003] However, an increase in tire section width compresses the vehicle space and reduces ride comfort in the vehicle. In addition, fuel consumption may deteriorate due to an increase in air resistance. [0004] In recent years, due to increasing attention to environmental issues, the demand for better fuel consumption has become more and more urgent. Fuel efficiency is evaluated by rolling resistance (RR (rolling resistance)), and it is known that the lower the rolling resistance, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/00B60C9/08
CPCB60C3/04B60C11/0041B60C11/1236B60C17/0009B60C2011/0025B60C2017/0054B60C2200/04Y02T10/86B60C11/04B60C2011/016
Inventor 畠中慎太郎桑山勲
Owner BRIDGESTONE CORP
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