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1. WO2020115409 - TYRE FOR A CIVIL ENGINEERING VEHICLE, COMPRISING A LEVEL-WOUND CROWN REINFORCEMENT WITH METAL REINFORCEMENTS

Publication Number WO/2020/115409
Publication Date 11.06.2020
International Application No. PCT/FR2019/052876
International Filing Date 02.12.2019
IPC
B60C 9/20 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
9Reinforcements or ply arrangement of pneumatic tyres
18Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
20built-up from rubberised plies each having all cords arranged substantially parallel
B60C 9/26 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
9Reinforcements or ply arrangement of pneumatic tyres
18Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
26Folded plies
CPC
B60C 9/20
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
CVEHICLE TYRES
9Reinforcements or ply arrangement of pneumatic tyres
18Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
20built-up from rubberised plies each having all cords arranged substantially parallel
B60C 9/26
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
CVEHICLE TYRES
9Reinforcements or ply arrangement of pneumatic tyres
18Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
26Folded plies
Applicants
  • COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN [FR]/[FR]
Inventors
  • BARBARIN, François
Agents
  • MILLANVOIS, Patrick
Priority Data
187233705.12.2018FR
190103604.02.2019FR
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) TYRE FOR A CIVIL ENGINEERING VEHICLE, COMPRISING A LEVEL-WOUND CROWN REINFORCEMENT WITH METAL REINFORCEMENTS
(FR) PNEUMATIQUE POUR VEHICULE DE GENIE CIVIL, COMPRENANT UNE ARMATURE DE SOMMET A RENFORTS METALLIQUES TRANCANNEE
Abstract
(EN)
The present invention relates to a tyre for a civil engineering vehicle, which comprises an at least partially level-wound crown reinforcement with metal reinforcements and is compatible with a use under high load and on aggressive soils. According to the invention, the reinforcements of the crown layers (211, 212) are metallic and are wound, in the form of a strip (5) of width W, in a zigzag circumferential trajectory according to a periodic curve (7) and extend over a number N of periods P distributed over a number T of circumferences 2ΠR and satisfying the two equations N*(W/sinA) = 2ΠR*t, wherein 0.6 ≦ t ≦ 1 and N*P=2ΠR*T, so as to constitute a bilayer (21). Furthermore, for at least 40% of the axially positioned strip crossovers (53) and with respect to the circumferential direction (XX') at an axial distance L1 being at most equal to 0.25 times the amplitude L of the periodic curve (7), the circular portion of the bilayer (213), which is centered on the strip crossover (53) and has a radius R1 equal to twice the width W of the strip (5), comprises Ne outer strip crossovers and Ni inner strip crossovers, such that |Ne-Ni|/(Ne+Ni)<= 0.3.
(FR)
La présente invention a pour objet un pneumatique, pour un véhicule de Génie Civil, comprenant une armature de sommet à renforts métalliques au moins en partie trancannée, compatible avec une utilisation sous charge élevée et sur des sols agressifs. Selon l'invention, les renforts des couches de sommet (211, 212) sont métalliques, et sont enroulés, sous forme d'une bandelette (5) de largeur W, selon une trajectoire circonférentielle en zigzag suivant une courbe périodique (7), s'étendant sur un nombre N de périodes P réparties sur un nombre T de circonférences 2ΠR et satisfaisant les deux relations N*(W/sinA)=2ΠR*t, avec 0.6<=t<=1 et N*P=2ΠR*T, de façon à constituer un bicouche (21). De plus, pour au moins 40% des croisements de bandelette (53) axialement positionnés, par rapport à la direction circonférentielle (XX'), à une distance axiale L1 au plus égale à 0.25 fois l'amplitude L de la courbe périodique (7), la portion circulaire de bicouche (213), centrée sur le croisement de bandelette (53) et ayant un rayon R1 égal à 2 fois la largeur W de bandelette (5), comprend Ne croisements de bandelette extérieurs et Ni croisements de bandelette intérieurs, de telle sorte que |Ne-Ni|/(Ne+Ni)<= 0.3.
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