TREAD STRUCTURE OF AN AGRICULTURAL VEHICLE TYRE

The invention relates to a tyre for an agricultural vehicle, comprising a tread (1) having a bearing surface (10) on which there are formed, on each side of the equatorial mid-plane (XX'), a plurality of main lugs (3) and a plurality of secondary lugs (3) that are shorter than the main lugs, ea...

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Bibliographic Details
Main Authors MONOD, Anthony, CABIOCH, Jean-Luc, TRAN, Florence, ANTON-ANTOLIN, Eduardo, CURAT, Alexandra
Format Patent
LanguageEnglish
French
Published 24.10.2019
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Summary:The invention relates to a tyre for an agricultural vehicle, comprising a tread (1) having a bearing surface (10) on which there are formed, on each side of the equatorial mid-plane (XX'), a plurality of main lugs (3) and a plurality of secondary lugs (3) that are shorter than the main lugs, each secondary lug (3) being interposed between two main lugs (2), this tyre being such that: - the main lugs (2) and the secondary lugs (3) comprise, in the radial direction, a pad (21, 31) made of a first material, each pad (21, 31) being surmounted by a second material that extends, in the new state, as far as the contact face of the main lugs and secondary lugs, the first and second materials being such that: - the viscous modulus G"1 of the first material is at most equal to 60% of the viscous modulus G"2 of the second material, - the complex modulus G*1 of the first material is different from the complex modulus G*2 of the second material, the difference between these complex moduli being at most equal to 30% of the complex modulus G*2 of the second material. Pneu pour engin agricole comprenant une bande de roulement (1) ayant une surface portante (10) sur laquelle sont formées de chaque côté du plan médian équatorial (XX') une pluralité de barrettes principales (3) et une pluralité de barrettes secondaires (3) plus courtes que les barrettes principales, chaque barrette secondaire (3) étant intercalée entre deux barrettes principales (2), ce pneu étant tel que : - les barrettes principales (2) et les barrettes secondaires (3) comprennent, dans la direction radiale, une lentille (21, 31) formée dans un premier matériau, chaque lentille (21, 31) étant surmontée par un deuxième matériau s'étendant à neuf jusqu'à la face de contact des barrettes principales et des barrettes secondaires, les premier et deuxième matériaux étant tels que : - le module visqueux G"1 du premier matériau est au plus égal à 60 % du module visqueux G"2 du deuxième matériau, - le module complexe G*1 du premier matériau est différent du module complexe G*2 du deuxième matériau, l'écart entre ces modules complexes étant au plus égal à 30 % du module complexe G*2 du deuxième matériau.
Bibliography:Application Number: WO2019FR50854