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Pneumatic tire

A technology of pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve problems such as large cornering force and poor vehicle straight-forward performance.

Inactive Publication Date: 2007-01-31
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these tires having an asymmetrical pattern have a problem that the so-called cornering force acting in the width direction of the tire as a component of the uniform composition of the tire becomes extremely large so that the straight running performance of the vehicle deteriorates

Method used

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  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The tire of Example 1 is a pneumatic tire for a passenger car having a tire size of 205 / 65R15, and the tire has figure 2 Tread pattern shown. All circumferential grooves have a groove depth of 8 mm and a groove width of 7 mm. The ratio of the effective contact area of ​​the tread half located on the outside of the vehicle to the effective contact area of ​​the tread half located on the inside of the vehicle is 1.14. An arc of circle centered on the equatorial plane of the tire defines two tread halves. The tire of Example 1 also had the parameters shown in Table 1. For comparison purposes, tires of Conventional Example 1 and Comparative Example 1 were also trial-produced. In the tire of conventional example 1, the tire size and the number of grooves in the circumferential direction, the groove depth, and the groove width are the same as those of the tire of embodiment 1, and each of the tread half regions is defined by an arc whose center is on the equatorial plane ...

Embodiment 2

[0039] The tire of Example 2 is a pneumatic tire for a passenger car having a tire size of 205 / 65R15, and the tire has figure 2 Tread pattern shown. All the circumferential grooves have a groove depth of 8 mm and a groove width of 7 mm. The ratio of the effective contact area of ​​the tread half located on the outside of the vehicle to the effective contact area of ​​the tread half located on the inside of the vehicle is 1.14. Two arcs define two tread halves, one of which is an arc centered on the equatorial plane of the tire, and the other is an arc inscribed on the aforementioned arc, parallel to the equatorial plane of the tire and centered at the width of the tire from the equatorial plane of the tire The outer side of the direction deviates from the arc on the line of 34.3mm. The tires of Example 2 also had the parameters shown in Table 2. For comparison purposes, tires of Conventional Example 2 and Comparative Example 2 were also trial-produced. In the tire of Conv...

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Abstract

There is provided a method of tire manufacturing a tire in which preset-beads each preformed by mounting a bead filler on a bead core are disposed radially outward of a carcass band and both side portions of the carcass band are turned around the preset beads to build the tire. The method eliminates a need to hold the considerable intermediate stocks and does not deteriorate the tire uniformity due to the unevenness of the preset bead in the circumference direction. There are also provided an apparatus of forming a preset bead used therefor and a system of forming a preset bead. In the method of manufacturing a tire in which preset-beads each preformed by mounting a bead filler on a bead core are disposed radially outward of a carcass band and both side portions of the carcass band are turned around the preset beads to build the tire, the preset bead is formed by winding and laminating a ribbon-shaped filler rubber 5 radially outward of the bead core 10 over several laps.

Description

technical field [0001] The present invention relates to a pneumatic tire having an asymmetrical tread pattern in which a plurality of circumferentially directional grooves extending substantially along the equatorial plane of the tire are provided on a tread portion, the orientation of which is specified relative to the vehicle when mounted on the vehicle The effective ground contact of the tread half area located on the outside of the vehicle when the tire is assembled on the specified rim, the tire is filled with the specified air pressure, and the mass corresponding to the maximum load capacity is applied to the tire. The area is greater than the effective ground contact area of ​​the tread half area located on the inside of the vehicle, wherein the tread half area is obtained by virtually dividing the tread portion into two parts at the equatorial plane of the tire. An object of the present invention is to suppress the cornering force of a tire so as to achieve a high leve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/00B60C11/04B60C11/03B60C11/11
CPCB60C11/11B60C2011/0388B60C11/00B60C11/033B60C11/0083B60C11/0304B60C11/0302B60C11/0306
Inventor 藤田一人
Owner BRIDGESTONE CORP
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