Pneumatic radial tire for passenger car and method for use thereof

A technology for radial tires and passenger cars, applied in special tires, tire parts, tire treads/tread patterns, etc., can solve the problems of handling stability, dry road braking, deterioration of braking performance, reduction of ground contact area and grip, Problems such as deterioration of wet road grip performance

Inactive Publication Date: 2014-08-27
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the case where the tread is provided with main grooves and / or lug grooves having a large width, there arises a problem that the negative ratio of the tread increases, so that the ground contact patch and grip are reduced, thereby degrading the handling stability and dryness. The braking performance of the road surface is deteriorated, and the wear resistance is also reduced and the noise performance is deteriorated
However, the use of tread rubber with relatively low hysteresis loss for tires has caused a problem in that the grip performance on wet road surfaces of the tires deteriorates

Method used

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  • Pneumatic radial tire for passenger car and method for use thereof
  • Pneumatic radial tire for passenger car and method for use thereof
  • Pneumatic radial tire for passenger car and method for use thereof

Examples

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Embodiment

[0174] In order to demonstrate the effects of the present invention, test tires of Inventive Example 1 to Inventive Example 21 and test tires of Comparative Example 1 to Comparative Example 7 were prepared. Table 4 shows the detailed characteristics of each test tire.

[0175] In Table 4, "Negative ratio" indicates the negative ratio of the main groove; "Total length" indicates the total length of the auxiliary grooves on the tread contact surface per unit area; "Width of land portion 3a" indicates the outermost side in the tread width direction The width of the land portion in the tread width direction; and “the width of the land portion 3b” means the width of the land portion on the inner side in the tread width direction in the tread width direction. In the column of "W1 / W2", when one type of auxiliary groove extends from one end of the land portion and the other type of auxiliary groove extends from the other end of the land portion such that one type of auxiliary groove a...

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Abstract

An object of the present invention is to adequately control relationship between a cross sectional width SW and an outer diameter OD of a pneumatic radial tire for a passenger vehicle. Specifically, a ground contact surface 1 of the tread of the pneumatic radial tire for a passenger car of the present invention is provided with either, as a groove, only at least one main groove 2a extending in the tread circumferential direction or, as grooves, only the main groove 2a and at least one auxiliary groove 2b other than the main groove, wherein the auxiliary groove has a groove width ‰¤ 2 mm in a tread widthwise region and a negative ratio of the main groove 2a is in the range of 12% to 20% (inclusive of 12% and 20%).

Description

technical field [0001] The invention relates to a pneumatic radial tire for passenger vehicles and a method for using the pneumatic radial tire. Background technique [0002] Until about 1960, bias tires having a narrow section width were mainly used in vehicles because the vehicles at that time were light in weight and the speed required for the vehicles was low, resulting in a light load on the tires. However, recently, with the development of the expressway network and the increase in the speed of automobiles, because the tires are required to have good handling stability and good wear resistance in high-speed operation, radial tires with a large width and a flat shape Tires are becoming mainstream (for example, see Patent Document 1). [0003] However, the increased width of the tire reduces the free space in the vehicle and degrades the comfort in the vehicle. In addition, tires of large width increase air resistance and cause another problem of poor fuel economy. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C3/04B60C11/04
CPCB60C3/04B60C11/033B60C11/03B60C11/04B60C11/0306B60C11/032B60C11/1236B60C2011/0341B60C2011/0344B60C2011/0381B60C11/12B60C2011/1209
Inventor 畠中慎太郎松本浩幸桑山勲
Owner BRIDGESTONE CORP
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