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Pneumatic tire

a technology of pneumatic tires and tires, applied in the field of pneumatic tires, can solve the problems of sacrificing other performance of tires such as wear resistance performance, and unable to ensure the sufficient wear resistance period of tires

Inactive Publication Date: 2014-05-22
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a pneumatic tire with improved performance. Specifically, it describes a tire structure that reduces surface strain and improves tire ride comfort while maintaining a symmetrical crown shape. The tire includes a carcass made up of two layers, a belt structure with a symmetrical pattern, and a tread with asymmetrical shapes. The belt structure has a width of at least 90% of the tire's ground-contact width and may include a delta configuration with a circumferential belt layer and a slant belt layer. Overall, the tire has improved performance and comfort with reduced strain and improved ride.

Problems solved by technology

However, the above method is also known to sacrifice other performance of tires such as wear resistance performance.
However, the above method poses a problem that a sufficient wear-resisting period of the tires may not be ensured.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0098]

TABLE 1Dimension of tire outer surfaceStructural dimensionSWSWhSHTWTDTGcTGhTGeCSWBWCSWh BDCSH L / Ltotalmmmmmmmmmmmmmmmmmmmmmmmmmm—Conventional2046312712061010.5 8  198140638  1140.26Example 1Comparative204631271206104.3 1.3198140630.81140.26Example 1Comparative20463127120  4.51010.58  198140635.51140.26Example 2Example 1 204631271206109.1 6.1198140635.61140.26Example 2 20463127 120  6.1 108.96  198140635.6 1140.26Example 3 20463127 1206108.8 5.8 198140635.31140.26Example 420463127 120  5.2 109.1 6.1198140634.8 1140.26Example 5 20463127 1206108.3 5.3 198140634.8 1140.26Example 6 20463127 120  4.2 109.1 6.1 198140633.8 1140.26Example 7 20463127 1206107.3 4.3 198140633.8 1140.26Example 820463127 1206106.3 3.3 198140632.8 1140.26Example 9 20463127 1206104.9 1.9 198140631.4 1140.26Example 1020463127 120  5.9 105.12  198140631.4 1140.26Example 1120470127 1206107.34.3198140713.8 1140.26Example 1220478127 1206107.3 4.3 198140783.8 1140.26Example 1320486127 1206107.3 4.3 198140863.8 114...

example 2

[0115]

TABLE 2Dimension of tire outer surfaceStructural dimensionSWSWhSHTWTDTGcTGhTGeCSWBWmmmmmmmmmmmmmmmmmmmmExample 26204781271206107.34.3198140Example 27204781271206107.34.3198140Example 28204781271206107.34.3198140Example 29204781271206107.34.3198140Example 30204781271206107.34.3198140Structural dimensionCSWhBDCSHL / LtotalCSEhCSWh / mmmmmm—mmBD / BWTD / TWTGh / TGcTGe / TGcCSHExample 26783.81140.26800.0270.0500.7300.4300.684Example 27783.81140.26970.0270.0500.7300.4300.684Example 28783.81140.261050.0270.0500.7300.4300.684Example 29783.81140.26730.0270.0500.7300.4300.684Example 30783.81140.26650.0270.0500.7300.4300.684CSEh / RollingLongitudinalDurability of cracksBW / CSWSWh / SHCSL / CSPSWhresistanceWearWeightspringin side portionExample 260.7070.6140.2601.03808597100109Example 270.7070.6140.2601.24808597.4101.5115Example 280.7070.6140.2601.35828697.6104.1116Example 290.7070.6140.2600.94808596.899.590Example 300.7070.6140.2600.83808596.69986

[0116]From Table 2, it can be seen that a greater ratio CS...

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Abstract

Provided is a pneumatic tire having at least one carcass layer as a skeleton extending in toroidal shape over a pair of bead portions, at least one belt layer and a tread disposed on an outer side in the radial direction of a crown portion of the carcass. In a tire section in the widthwise direction in state where the tire is assembled to an application rim, ratio BD / BW of radius difference BD between radius at a center portion and radius at an end portion in the widthwise direction of an innermost layer of the belt layer, to width BW of the innermost layer, ranges from 0.01 to 0.04, and ratio TD / TW of radius difference TD between radius at a center portion and radius at an end portion of the tread in the widthwise direction of a tread ground surface, to tread ground-contact width TW, satisfies BD / BW<TD / TW.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to and the benefit of Japanese Patent Application No. 2011-136674 filed Jun. 20, 2011, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a pneumatic tire that has low rolling resistance, good partial wear resistance performance, and reduced weight.BACKGROUND ART[0003]Recently, in order to address environmental problems such as global warming, products having less of an adverse impact on the environment are being actively developed. Tires are no exception to such products. In case of tires, in order to address the environmental problems, it is important to ensure tire performance that would contribute to higher fuel efficiency of vehicles. As one method to achieve the above task, reducing tire rolling resistance and tire weight has been proposed, and various technologies have been developed until now.[0004]Some of the conventional improvem...

Claims

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Application Information

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IPC IPC(8): B60C3/04
CPCB60C15/0036B60C9/28B60C11/0083B60C2011/0033B60C9/0292B60C2009/283B60C2015/009Y10T152/10765B60C3/04Y02T10/86
Inventor KATAYAMA, SHINSAKU
Owner BRIDGESTONE CORP