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Tyre with improved bead

A tire and bead technology, which is applied to tire parts, bead edges, vehicle parts, etc., can solve problems such as demand and bulky packing

Active Publication Date: 2015-04-15
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stiffening effect of the filler is applied especially in the area away from the bead, thus requiring an even bulkier filler and thus causing even greater hysteresis losses

Method used

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Examples

Experimental program
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Embodiment Construction

[0040] As far as the use of the term "radial" is concerned, it is appropriate to distinguish between the various ways in which those skilled in the art use the term. First, the expression refers to the radius of the tire. In this sense, if the point P1 is closer to the axis of rotation of the tire than the point P2, the point P1 is said to be located "radially inside" of the point P2 (or "inside the point P2 in the radial direction"). Conversely, if the point P3 is farther from the axis of rotation of the tire than the point P4, the point P3 is said to be located "radially outside" of the point P4 (or "radially located outside of the point P4"). When advancing in the direction of a smaller (or larger) radius, it is called "radially inward (or outward)". This meaning of the term also applies to radial distances.

[0041] In contrast, when the wire or the reinforcing element of the reinforcement forms an angle greater than or equal to 80° and less than or equal to 90° with the ci...

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Abstract

Tyre comprising two beads (20) comprising a bead wire (70) and a carcass (60) anchored around the two bead wires by turning back, a squat filler (110) of small height, a sidewall stiffening reinforcement (140) which is metallic, an outer strip (170) of soft rubber compound, placed axially on the outside of the carcass (60) and of the filler (110), and a protective layer (160) of rubber compound, wherein the assembly formed by the stiffening reinforcement and the outer strip has a thickness EB(R) and the protective layer (160) has a thickness EE(R), R being the distance with respect to the radially innermost point (71) of the bead wire (70), and wherein the thicknesses EB(R) and EE(R) satisfy a set of geometric conditions.

Description

Technical field [0001] The present invention relates to tires for passenger vehicles, in particular to the beads of these tires. Background technique [0002] Reducing greenhouse gases emitted by vehicles is one of the main challenges facing current vehicle manufacturers. Tires are an important area where progress can be made by reducing rolling resistance, because rolling resistance has a direct impact on vehicle fuel consumption. As for example, Michelin recently introduced the market As evidenced by the great success that Saver tires have enjoyed, significant progress has been made. The technology used achieves a fuel saving of almost 0.2l per 100km in the mixed cycle, which is equivalent to a reduction of almost 4g CO per km 2 . This corresponds to about one ton of CO during the life of the vehicle 2 Is not discharged into the atmosphere. [0003] Considering the predictable increase in the cost of crude oil and consumers' growing awareness of ecological issues, it is neces...

Claims

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Application Information

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IPC IPC(8): B60C15/06B60C15/024
CPCB60C2015/061B60C2015/0657B60C15/0653B60C15/0603B60C15/06B60C2015/0639B60C15/0242B60C2015/0621B60C15/0628B60C2015/0678
Inventor F·布儒瓦
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN