Patent ID: 11878557
Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A tire for a heavy-duty civil engineering vehicle, comprising:
a crown reinforcement radially disposed on an inside of a tread and radially arranged on an outside of a carcass reinforcement, the crown reinforcement comprising, radially from the outside to the inside, a protective reinforcement and a working reinforcement, said protective reinforcement comprising a plurality of protective layers formed by a first, radially innermost protective layer having a width along an axial direction LP1 and including elastic metal reinforcers having a tensile elastic modulus at most equal to 150 GPa, which are coated in an elastomeric material, are mutually parallel and form an angle Alpha1 with a circumferential direction tangential to the circumference of the tire, said elastic metal reinforcers of the first, radially innermost protective layer having a diameter D1 and being distributed at an axial spacing P1, said protective reinforcement further comprising a second, radially outermost protective layer having another width along the axial direction LP3 and including elastic metal reinforcers having a tensile elastic modulus at most equal to 150 GPa, which are coated in an elastomeric material, are mutually parallel and form an angle Alpha2 with a circumferential direction tangential to a circumference of the tire, said elastic metal reinforcers of the second, radially outermost protective layer having a diameter D2 and being distributed at an axial spacing P2, and the working reinforcement comprising a plurality of working layers respectively comprising metal reinforcers which are coated in an elastomeric material, are mutually parallel, form an angle at least equal to 15° and at most equal to 45° with the circumferential direction, and are crossed from one working layer to the next;
wherein a third protective layer, which forms an intermediate protective layer having a further width along the axial direction LP2, is interposed between the first radially innermost protective layer and the second radially outermost protective layer and is in contact therewith, said intermediate protective layer comprising elastic metal reinforcers having a tensile elastic modulus at most equal to 150 GPa, which are coated in an elastomeric material, are mutually parallel and form an angle Alpha3 with a circumferential direction tangential to the circumference of the tire, said elastic metal reinforcers having a diameter D3 and being distributed at an axial spacing P3;
wherein the angles Alpha1, Alpha2, Alpha3 of the first, radially innermost protective layer, the second, radially outermost protective layer and the intermediate protective layer, respectively, satisfy the following relationships:

15°≤|Alpha1|≤40°

15°≤|Alpha2|≤40°

Alpha1*Alpha2≤0

35°≤|Alpha3|≤75°; and

wherein differences between angles of the elastic metal reinforcers of the protective layers with the circumferential direction in terms of absolute values satisfy the following relationships:

|(Alpha1−Alpha3)|≥10°

|(Alpha2−Alpha3)|≥10°.