Pneumatic tyre with improved bead structure

A technology of pneumatic tire and carcass structure, applied to the reinforcement layer, tire parts, tires and other directions of pneumatic tires, can solve the problem that the stability of the geometric structure of the bead cannot be guaranteed, and achieve increased geometric structure stability, The effect of reducing time and simplifying the manufacturing process

Active Publication Date: 2007-11-14
PIRELLI TYRE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, even with the presence of such a rubber coating, which advantageously facilitates the holding of the windings together due to the cohesive nature of the rubber of the semi-finished product, the Applicant has noted that in some cases, especially in truck tires In the case of the bead, the geometric stability of the bead cannot be guaranteed

Method used

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  • Pneumatic tyre with improved bead structure
  • Pneumatic tyre with improved bead structure
  • Pneumatic tyre with improved bead structure

Examples

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example 1

[0124] Two types of tires (Tire A and Tire B) were manufactured, the size of which was 315 / 80 R22.5.

[0125] Tires A and B have the same structural elements, namely the same carcass (a carcass ply), two intersecting belt layers, two transverse reinforcing strips (zero degree reinforcing strips, which are positioned at the radially outer, and consists of two radially overlapping layers, as shown in Figures 1 and 2), a buffer layer (which overlaps radially on the radially outer belt layer and is located between the transverse reinforcing strips), likewise tread belt.

[0126] Tire A (a tire according to the invention) also comprises a bead core as shown in FIG. The bead core is obtained by forming seven axially adjacent columns, each column consisting of six radially overlapping coils. According to the invention, the bead core also comprises retaining means applied in the form of a sheet by folding the sheet around the peripheral contour of a plurality of coils constituted by...

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Abstract

A truck pneumatic tyre, the bead core of which includes: a) a plurality of coils of at least one metallic wire, the coils being radially superimposed and axially arranged side-by-side with respect to each other, and b) a retaining member enveloping the plurality of coils, the retaining member including a plurality of mutually substantially parallel elongated reinforcing elements that include at least one preformed threadlike metallic element.

Description

technical field [0001] The present invention relates to pneumatic tires suitable for use in trucks or trucks, particularly trucks for medium / heavy haulage. [0002] In particular, the present invention relates to a pneumatic tire having an improved bead structure that contributes to increased geometric stability and prevents localized deformation of the bead area. Background technique [0003] A tire generally comprises: a carcass structure with at least one carcass ply, the ends of which are folded back or fixed on two annular reinforcing elements, the so-called "bead cores"; a tread band; an arrangement a belt layer between the carcass structure and the tread band; and a pair of sidewalls applied to the carcass structure in axially opposite positions. [0004] The area of ​​the tire including the bead core is called "tyre bead", which has the function of fixing the tire on the corresponding rim. In particular, this bead core acts as an anchor (anchroage) for one or more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/04B29D30/48
CPCD07B1/0633D07B2201/2033D07B1/0646B60C2009/2219D07B2201/2089B60C2015/048D07B2501/2053B60C15/04B29D30/50B60C9/0057
Inventor G·达吉尼G·塞雷达
Owner PIRELLI TYRE SPA
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