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Pneumatic radial tire for passenger vehicle

A technology for radial tires and passenger cars, applied to the reinforcement layer of pneumatic tires, special tires, tire parts, etc., can solve the problems of increased tire weight and air resistance, reduced rolling resistance, high vehicle resistance, etc., to achieve Effects of improving wet road performance and rolling resistance performance

Inactive Publication Date: 2017-08-18
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the diameter and width of the tire increase, the weight and air resistance of the tire increase
This causes high vehicle resistance, makes it impossible to achieve a sufficient rolling resistance reduction effect, and also leads to excess load capacity of the tire

Method used

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  • Pneumatic radial tire for passenger vehicle
  • Pneumatic radial tire for passenger vehicle
  • Pneumatic radial tire for passenger vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] The tire of embodiment 1 is such as figure 1 with figure 2 Tire size shown is for a 165 / 60R19 tire. This tire had the specifications shown in Table 1, and was provided in the tread surface T with two circumferential main grooves. In the tire of Example 1, in the central land portion divided by these two circumferential main grooves, a plurality of sipes (central sipes) are arranged at a predetermined pitch length L measured in the tire circumferential direction, and the land portion The width W (mm) of the land portion of the land portion, the total length Ws (mm) of the sipe components in the tire width direction of the sipe arranged within the range of one pitch length L in the land portion, the pitch length L (mm), and the The tire circumferential sipe component total length Ls (mm) of sipes arranged within a range of one pitch length L in the land portion satisfies the relationships 0.4W≤Ws≤1.2W and 0.6L≤Ls≤3L. In the tire of Example 1, the average pitch length ...

Embodiment 2 to Embodiment 6

[0117] The tires of Examples 2 to 6 were the same as the tires of Example 1 except that the specifications were changed as shown in Table 1 and small holes were provided.

Embodiment 1 to Embodiment 6

[0127] Example 1 to Example 6, Comparative Examples 3 to 4: rim size 5.5J-19, internal pressure 300kPa

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Abstract

The purpose of the present invention is to provide a passenger vehicle pneumatic radial tire with a narrow width and large diameter and with improved wet performance and rolling resistance performance. This pneumatic radial tire for a passenger vehicle is characterized in that: when the tire is fitted on a rim and has an internal pressure of 250 kPa or more, the ratio (SW / OD) of the section width (SW) of the tire to the outer diameter (OD) (mm) is less than or equal to 0.26 if the section width (SW) is less than 165 (mm), and the relationship between SW and OD satisfies 2.135 x SW + 282.3 <= OD if SW is greater than or equal to 165 (mm); the tread rubber has a dynamic storage elastic modulus (E') of 6.0 to 12.0 MPa and a loss tangent (tan [be]) of 0.05 to 0.15; and a plurality of sipes are arranged at a predetermined pitch length (L) on at least one land part, wherein the relationship among land part width (W), tire widthwise sipe total length (Ws) within one pitch length (L), pitch length (L), and tire circumferential sipe total length (Ls) within one pitch length (L) satisfies 0.4W <= Ws <= 1.2W and 0.6L <= Ls <= 3L.

Description

technical field [0001] The present invention relates to a pneumatic radial tire for passenger vehicles. Background technique [0002] Conventional vehicles until about 1960 were lightweight and not required to have high cruising speeds, so low load, narrow section width bias tires were used. Currently, wider radial tires have been gradually developed for heavier and faster vehicles (for example, Patent Document 1). [0003] However, wider tires compress the space of the vehicle and reduce the ride comfort of the vehicle. In addition, an increase in air resistance leads to a decrease in fuel efficiency. [0004] Increased attention to environmental issues in recent years has intensified the demand for high fuel efficiency. High fuel efficiency can be evaluated based on rolling resistance (RR). It is known that lower rolling resistance contributes to higher fuel efficiency. [0005] Increasing the diameter and width of a tire is known to be effective in reducing the rolli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/12B60C9/08B60C11/00B60C11/03
CPCB60C11/0306B60C11/032B60C2011/0341B60C2011/0025B60C11/1236B60C3/04Y02T10/86B60C11/0008B60C11/03B60C11/0332B60C2011/0016B60C2011/0353
Inventor 畠中慎太郎桑山勲
Owner BRIDGESTONE CORP
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