PROTECTIVE REINFORCEMENT COMPRISING DIFFERENTIATED LAYERS FOR A PNEUMATIC TYRE FOR A HEAVY-DUTY CIVIL ENGINEERING VEHICLE

摘要

The invention relates to a radial pneumatic tyre (1) for a heavy-duty civil engineering vehicle and aims to reduce the risk of tread separation of the pneumatic tyre, during driving on sharp rocks, while ensuring good resistance to cracking of the crown reinforcement. The pneumatic tyre (1) comprises a protective reinforcement (5) comprising two protective layers (51, 52), the radially innermost protective layer (51) comprising elastic metal reinforcements with a diameter D1 which are axially distributed according to an axial pitch P1, and the radially outermost protective layer (52) comprising elastic metal reinforcements with a diameter D2 which are axially distributed according to an axial pitch P2. According to the invention, the following relations are satisfied: D1D2 P1P2 P1= 1.2*D1 et P2= 1.2*D2 2.5= (D1*P1)/ (D2*P2) =5