Heavy Vehicle Tire Bead

摘要

Heavy vehicle tire with two beads (2) contacting rim (3) an outer face (21), radial carcass reinforcement (4) having carcass layer (41) wound within each bead (2) around bead wire (5) having centre (O) to form turnup (411), additional circumferential reinforcement (6), in each bead (2), having additional layer (61, 62), additional reinforcement (6) extending radially from radially inner end (E1) to radially outer end (E2) and axially on outerside of axially outermost turnup (411). The orthogonal projection (P1) of radially inner end (E1) of additional circumferential reinforcement (6) onto axially outer face (21) of bead (2) is radially on outside of centre (O) of bead wire (5), the orthogonal projection (P2) of radially outer end (E2) of additional circumferential reinforcement (6) onto axially outer face (21) of the bead (2) contacting point (P′2) of rim (3) that is axially on inside of point (C) of last contact of rim (3) when tire (1) is mounted and inflated, and radial distance (d) between end (E1) and end (E2) of additional circumferential reinforcement (6) is at most 20 mm.

主权项

1. A heavy vehicle tire comprising:
two beads intended to come into contact with a rim respectively via at least one axially outer face, a radial carcass reinforcement comprising at least one carcass layer wound within each bead around a bead wire having a centre to form a turnup (411), an additional circumferential reinforcement, in each bead, comprising at least one additional layer, the additional reinforcement extending radially from a radially inner end as far as a radially outer end (E2) and axially on the outerside of the axially outermost turnup, wherein the orthogonal projection of the radially inner end of the additional circumferential reinforcement onto the axially outer face of the bead is radially on the outside of the centre of the bead wire, in that the orthogonal projection of the radially outer end of the additional circumferential reinforcement onto the axially outer face of the bead is intended to come into contact with a point of the rim that is axially on the inside of the point of last contact of the rim when the tire is mounted on its rim and inflated to a recommended pressure, and in that the radial distance between the radially inner end and the radially outer end of the additional circumferential reinforcement is at most equal to 20 mm.