The invention relates to a tyre for a heavy vehicle, comprising two beads (2) which are intended to come into contact with a rim (3) via at least one axially outer face (21) respectively, a radial carcass reinforcement (4) comprising at least one carcass layer (41) turned up within each bead (2) around a bead wire (5) having a centre (O) to form a turn-up (411), and an additional circumferential reinforcement (6), in each bead (2), comprising at least one additional layer (61, 62), the additional reinforcement (6) extending radially from a radially inner end (E1) as far as a radially outer end (E2) and axially on the outside of the axially outermost turn-up (411). The inventors have set them self the task of optimizing the radial distance (d) between the respectively radially inner (E1) and radially outer (E2) ends of an additional circumferential reinforcement (6) while at the same time maintaining the same level of bead endurance obtained with such an additional circumferential reinforcement. According to the invention, the orthogonal projection (P1) of the radially inner end (E1) of the additional circumferential reinforcement (6) onto the axially outer face (21) of the bead (2) is radially on the outside of the centre (O) of the bead wire (5), the orthogonal projection (P2) of the radially outer end (E2) of the additional circumferential reinforcement (6) onto the axially outer face (21) of the bead (2) is intended to come into contact with a point (P'2) on the rim (3) that is axially on the inside of the point (C) of last contact of the rim (3) when the tyre (1) is mounted on its rim (3) and inflated to a recommended pressure, and the radial distance (d) between the radially inner end (E1) and the radially outer end (E2) of the additional circumferential reinforcement (6) is at most equal to 20 mm.
Heavy vehicle tyre bead
19.08.2015
Patent
Elektronische Ressource
Englisch
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |
Bead of a tyre for a heavy vehicle of construction plant type
Europäisches Patentamt | 2016
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