Tire with rounded bead toe and mold for forming the tire

A tire, conical technology, applied in the field of truck and bus tires, heavy-duty tires, can solve the problem of ending the useful life of the carcass, shortening and so on

Inactive Publication Date: 2005-05-25
MICHELIN RECH & TECH SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If severe, this damage can shorten or end the useful life of the carcass

Method used

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  • Tire with rounded bead toe and mold for forming the tire
  • Tire with rounded bead toe and mold for forming the tire
  • Tire with rounded bead toe and mold for forming the tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] figure 1 A cross-section of the bead portion of a heavy duty tire, such as a bus or truck tire, is shown. The outer surface 20 and inner surface 22 of the tire provide a reference orientation. The bead portion includes a bead core 24 which in the illustrated embodiment is formed from a coil of rectangular cross-section wire. Other shapes, including oval and circular, can also be used as bead cores, as is well known in the art.

[0019] refer to figure 2 , the bead portion is installed on the rim 50 . The tension on the bead core 24 is transferred to the rim by compressing the rubber between the bead core 24 and the rim seat 52 to secure the bead to the rim, and thus the tire to the rim. The bead portion has a flat-shaped bead seat surface 26 of the rim in combination with a rim seat 52 of the rim 50 . A reference seat point 28 near the outer end of the seat surface 26 coincides with the standard reference point S on the rim. The standard dimensions for rims are p...

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Abstract

A heavy-duty truck or bus tire mounted on a 15° deep groove rim has a rounded bead, which solves installation problems and saves material. The bead toe is bounded by the bead seat and the end surface of the bead toe and forms an included angle of 105°-150°. Furthermore, a transition point between the bead seat and the toe end surface is located relative to the bead seat point at 0.95-0.97 times the axial distance from the center of the tire and at least 0.78 times the radial distance of the bead seat point. A mold for manufacturing the tire is also disclosed.

Description

technical field [0001] The present invention relates to tires for heavy-duty transport vehicles, such as tires for trucks and buses. In particular, the present invention relates to heavy duty tires having bead toes shaped to improve durability and ease removal and reinstallation over the life of the tire. Background technique [0002] The bead is the part of the tire that joins the rim. The bead generally includes a flat surface defining a core shape that mates with the seat of the wheel to transmit the force of the bead core or to secure the tire to the rim. The bead seat forms an airtight member to retain compressed air within the tire. In conventional truck and bus tires, the bead terminates in a triangular bead that extends from the bead coil or bead core toward the tire's axis of rotation. [0003] Truck and bus tires with a 15° drop center rim generally have an extended bead toe, which is believed to help hold the bead in place on the rim seat and to help stop the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C15/024B29D30/06B29C33/02B29L30/00B60C15/00
CPCB29D30/0601B60C15/024
Inventor K·K·小邦帕斯J·-P·加列戈
Owner MICHELIN RECH & TECH SA
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