Tire with dissymmetrical beads

Patent metadata

Field	Value
Publication number	US-9579933-B2
Application number	US-201113883108-A
Country	US
Kind code	B2
Filing date	Nov 14, 2011
Priority date	Nov 18, 2010
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A tire intended to be mounted on a drop-center rim with a flange height G and a radius of curvature R1 has first and second beads each having an annular reinforcing structure having a radially innermost point, the radial distance between the radially innermost point and the mounting rim being A, and a carcass reinforcement anchored in the two beads by being turned back around the annular reinforcing structure forming, within each bead, a main strand and a turned-back strand, in which the thicknesses EB1 of the first bead and EB2 of the second bead are the distance separating (i) the point on the main strand that is at a distance R from the radially innermost point, where R=G+(R1)/2−A, and (ii) the point on the exterior surface of the bead that is at the distance R from the radially innermost point, and in which |EB1−EB2|≧1 mm.

First claim

The invention claimed is:

1. A tire mounted on a drop-center standard rim having a diameter code greater than or equal to 10 and less than or equal to 20 and type “B” or “J” flanges, with a flange height G and a radius of curvature R1, the tire being inflated with an inflating gas to the tire's service pressure, this tire comprising:
a first and a second bead, the two beads coming into contact with said mounting rim, each bead having an exterior surface, in contact with the atmospheric air, and an interior surface, in contact with the gas with which the tire is inflated, each bead comprising at least one annular reinforcing structure, the at least one annular reinforcing structure having, in any radial section, at least one radially innermost point;
two sidewalls extending the beads radially outwards, the two sidewalls meeting in a crown comprising a crown reinforcement surmounted by a tread;
a carcass reinforcement extending from the beads through the sidewalls as far as the crown, the carcass reinforcement comprising a plurality of carcass reinforcing elements and being anchored in the two beads by being turned back around the at least one annular reinforcing structure so as to form, within each bead, a main strand and a turned-back strand;
wherein the first bead has a thickness EB1 and the second bead has a thickness EB2, the thicknesses EB1 and EB2 being defined as the distance separating
(i) the axially innermost point on the interior surface of the main strand of carcass reinforcement that is at a distance R from a single one of said at least one radially innermost point of the at least one annular reinforcing structure of the bead, where the radial distance between said single one of said at least one radially innermost point of the at least one annular reinforcing structure and the mounting rim is denoted by A and R=G+(R1)/2−A, and
(ii) the point on the exterior surface of the bead that is at this same distance R from said one of said at least one radially innermost point of the at least one annular reinforcing structure of the bead, and wherein the absolute value of the difference between the thicknesses EB1 and EB2 is greater than or equal to 1 mm and less than or equal to 8 mm, and the point on the exterior surface of the bead that is at the same distance R from the one of the at least one radially innermost point of the at least one annular reinforcing structure of the bead is not in contact with the rim flange.

2. The tire according to claim 1 , wherein the difference between the thicknesses EB1 and EB2 is greater than or equal to 3 mm.

Assignees

• Pirotte Pascal
• Egerszegi Christophe
• Michelin & Cie
• Michelin Rech Tech

Inventors

• Pirotte Pascal
• Egerszegi Christophe

Classifications

• Y10T152/10819

  Characterized by the structure of the bead portion of the tire · CPC title

• B60C15/0036

  with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width · CPC title

• B60C15/02 Primary

  Seating or securing beads on rims (sealing means between beads and rims of tubeless tyres B60C5/16; means for securing solid tyres on rims B60C7/24) · CPC title

• B60C15/0018

  not folded around the bead core, e.g. floating or down ply · CPC title

• B60C17/0009

  comprising sidewall rubber inserts, e.g. crescent shaped inserts · CPC title