| 摘要 |
A tire having a crown reinforcement (5), comprising at least one crown layer (51), and a carcass reinforcement (6), comprising at least one turned-up carcass layer (61), the turned-up carcass layer (61) comprising mutually parallel reinforcers turned up, within each bead, from the inside towards the outside of the tire around a bead wire (7), to form a turn-up (8) comprising a free end (E). The turned-up carcass layer (61) comprises a crown portion (611) and a lateral portion (612), the crown portion (611) extending axially between a first and a second end (E1, E′1) which is symmetric about the equatorial plane (P), the lateral portion (612) extending radially inwards, from a first end (E2) as far as a second end (E3). The reinforcers of the lateral portion (612) and the reinforcers of the turn-up (8) form, with the circumferential direction (X), specified angles. |
| 主权项 |
1. Tire (1) for a motorized two-wheeled vehicle of the motorbike type, comprising:
a tread (2) connected by two sidewalls (3) to two beads (4), a crown reinforcement (5), radially on the inside of the tread (2), comprising at least one crown layer (51), a carcass reinforcement (6), radially on the inside of the crown reinforcement (5), comprising at least one turned-up carcass layer (61), the turned-up carcass layer (61) comprising mutually parallel reinforcers turned up, within each bead (4), from the inside towards the outside of the tire around a bead wire (7), to form a turn-up (8) comprising a free end (E), the turned-up carcass layer (61) comprising a crown portion (611) and a lateral portion (612), the crown portion (611) extending axially between a first and a second end (E1, E′1) which is symmetric about the equatorial plane (P) of the tire, the lateral portion (612) extending radially inwards, from a radially outermost first end (E2), radially on the inside of the free end (E) of the turn-up (8), as far as a radially innermost second end (E3), radially on the inside of the radially innermost point (I) of the bead wire (7),characterized in that the reinforcers of the crown portion (611) form, with the circumferential direction (X), a substantially constant angle (A1) at least equal to 65°, in that the reinforcers of the lateral portion (612) form, with the circumferential direction (X), an angle (A3) that increases, from the radially outermost first end (E2) to the radially innermost second end (E3) from an angle at least 5° smaller than the substantially constant angle (A1) formed by the reinforcers of the crown portion (611), and in that the reinforcers of the turn-up (8) form, with the circumferential direction (X), an angle (A4) which is equal in terms of absolute value to, but of opposite sign from, the angle (A3) formed by the reinforcers of the lateral portion (612). |
