Compagnie Generale Des Etablissements Michelin

Cédric Khayat

Alain Domingo

Emmanuel Clement

Vincent Estenne

Elodie Le Chenadec

A radial pneumatic tire for a heavy-duty civil engineering vehicle aims to reduce the risk of tread separation of the pneumatic tire, during driving on sharp rocks, while ensuring good resistance to cracking of the crown reinforcement. The pneumatic tire has a protective reinforcement with two protective layers, the radially innermost protective layer having elastic metal reinforcements with a diameter D1 which are axially distributed according to an axial pitch P1, and the radially outermost protective layer has elastic metal reinforcements with a diameter D2 which are axially distributed according to an axial pitch P2. In the tire the following relations are satisfied:1&#x3e;21&#x3e;21&#x3e;=1.2*1 and2&#x3e;=1.2*22.5&#x3c;=(1*1)/(2*2)&#x3c;=5.

Protective reinforcement comprising differentiated layers for a pneumatic tire for a heavy-duty civil engineering vehicle

A hooping reinforcement of a tire for a heavy duty civil engineering type vehicle is disclosed. The crown reinforcement () of the tire (), radially on the inside of a tread (), comprises a protective reinforcement (), a working reinforcement () and a hooping reinforcement (). Said hooping reinforcement () has an axial width at most equal to the smallest axial width (L, L) of the two working layers (), and comprises at least two hooping layers () that are formed from strips each made up of elastic metal reinforcers. Each hooping layer () is made up of an axial juxtaposition of contiguous turns of the strip (), which are circumferentially wound around the working layer (). Each strip () is at least 35 mm and at most 250 mm thick, and its distributed breaking tension is at least equal to 100 daN/mm.

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Clermont-Ferrand, France

Cédric Khayat