Pneumatic tire

A technology of pneumatic tires and beads, applied in tire parts, treads, transportation and packaging, etc., can solve problems such as rim slippage, and achieve the effects of suppressing bending, excellent fitability, and easy fit

Inactive Publication Date: 2017-02-22
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can cause the rim to slip

Method used

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  • Pneumatic tire
  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] got to have figure 1 The tire of Example 1 having the structure shown in -2. Set the size of the tire to 11R22.5. Each part of the tire is shown in Table 1. In this tire, the width L of the dimple was 24.3 mm, the width W of the bead core was 16.0 mm, and the distance L1 was 8.5 mm. The cross-sectional shape of the depression is a substantially circular arc. Furthermore, the distance E between the reference line M and the bottom surface of the bead core was set to 7.2 mm. The absolute value θ of the angle formed by the cords of the carcass ply and the equatorial plane was 90°.

Embodiment 2－3、 comparative example 2－3

[0070] Tires of Example 2-3 and Comparative Example 2-3 were obtained in the same manner as in Example 1, except that the depth D of the dent was changed so that the ratio (D / L) was the value shown in Table 1.

Embodiment 4－7

[0072] Tires of Examples 4-7 were obtained in the same manner as in Example 1 except that the absolute value α was set to the value shown in Table 2.

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PUM

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Abstract

The invention provides a pneumatic tire which achieves good chimerism, resistance to rim slip, and suppression of undulation. A tire (2) of the present invention includes a pair of fillers (20) turned up around beads (10). Each filler (20) has multiple cords made of steel and aligned with each other. In the tire (2), an outer surface of a chafer (8) has a bottom surface (26) that contacts with a seat surface of a rim (30). When a reference line (M) represents a straight line that contacts with the bottom surface (26) in a cross-section obtained by cutting the tire at the plane perpendicular to the circumferential direction, the bottom surface (26) has a depression (66) that is shaped so as to project radially outward of the reference line (M). A ratio (D / L) of a maximum depth (D) of the depression (66) to a width L of the depression (66) is greater than or equal to 0.007 and not greater than 0.060.

Description

technical field [0001] The present invention relates to pneumatic tires. Specifically, the present invention relates to a heavy-duty pneumatic tire mounted on vehicles such as trucks and buses. Background technique [0002] In a tire, a portion of a bead is fitted to a rim. In the driving state, parts of this bead are loaded with relatively large loads. Durability that can withstand this load is required for the portion of the bead. [0003] Beads fitted to the rim fasten the rim. In order to prevent the tire from sliding relative to the rim, that is, "rim slip", it is desirable to increase the fastening force of the bead. On the other hand, in order to facilitate the attachment of the tire to the rim, it is desirable to reduce the pressure at the time of fitting the bead to the rim. A tire is desired that is easy to attach to the rim (that is, has excellent fitting properties) while preventing the rim from slipping. [0004] When the tire is fitted into the rim, the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/04
CPCB60C15/04B60C2015/046B60C15/024B60C2015/0692B60C2015/048B60C2015/0614B60C15/0607B60C2200/06
Inventor 井藤仁
Owner SUMITOMO RUBBER IND LTD
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