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Beads of tires for heavy vehicles of construction site type

A heavy-duty vehicle, type of technology, applied in the direction of heavy-duty tires, reinforcement layers of pneumatic tires, wheels, etc., can solve the problems of reduced tire life, reduced bead durability, fatigue damage, etc.

Active Publication Date: 2016-05-25
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] Considering that the bead mechanically behaves like a beam in bending (the outer and inner axes of the bead being the main part and the turnup, respectively), the turnup subjected to bending cycles suffers from a compression deformation that can lead to its Fatigue failure, and consequently reduced bead durability and reduced tire life

Method used

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  • Beads of tires for heavy vehicles of construction site type
  • Beads of tires for heavy vehicles of construction site type

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0063] figure 1 A prior art bead for a tire for a heavy vehicle of construction site type is shown, comprising:

[0064] - a carcass reinforcement comprising a single carcass reinforcement 1 made of metallic reinforcing elements coated in a polymeric coating material, with the main part 1a surrounding the bead wire 2 from the inside of the tire wound outwards to form the bead 1b,

[0065] - the distance a between the bead 1b and the main part 1a decreases continuously radially outward from the bead wire 2 up to a minimum distance a 1 , and then increase continuously until the maximum distance a 2 ,

[0066] - a filling element 3 extending the bead wire 2 radially outwards and made of two polymer filling materials,

[0067] - a first polymer filling material 3a radially outside the bead wire 2 and in contact with the bead wire 2,

[0068] - the second polymer filling material 3b is radially outside the first polymer filling material 3a and is in contact with the first poly...

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PUM

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Abstract

The present invention relates to improving the durability of the beads of radial tires for heavy vehicles of the construction site type by reducing cracking of the polymeric material starting on the axially outer side of the rolled-up portion and spreading through the coating and filler. According to the invention, the transition element ( 28 ) made of transition polymer material is in contact via its axially inner face with the coated polymer material of the axially outer side of the rolled-up portion ( 21b ) and, via its axially outer face, with said The filler polymer material (26) is in contact, and the transition polymer material has a modulus of elasticity at 10% elongation between the respective elastic moduli at 10% elongation of the coating polymer material and the filler polymer material between the amount.

Description

technical field [0001] The present invention relates to a radial tire mounted to a construction site type heavy vehicle. Background technique [0002] Although not limited to this type of application, the invention will be made more particularly with reference to a radial tire intended to be mounted on a dump truck, a type of vehicle used to transport material extracted from a quarry or open pit describe. The rim of such tires has a nominal diameter of at least 25", within the meaning of the European Tire and Rim Technical Organization (ETRTO) standard. [0003] The following definitions apply as follows: [0004] – "Meridian plane": the plane containing the axis of rotation of the tyre. [0005] - "equatorial plane": the plane passing through the middle of the tread surface of the tyre, and perpendicular to the axis of rotation of the tyre. [0006] - "radial direction": a direction perpendicular to the axis of rotation of the tyre. [0007] - "axial direction": a dire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C15/00B60C15/06
CPCB60C2015/0614B60C15/0607B60C2015/061B60C2015/0621B60C2200/065Y10T152/10828Y10T152/10846B60C2009/0276B60C15/0603B60C15/0063B60C15/06
Inventor L·邦迪
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN