The drum construction of tyre and the central section expansu00ecvel and sets of locking bead regardless expansu00ecveis in sections of the end

摘要

"Drum construction of tyre and the central section expansu00ecvel and sets of locking bead regardless expansu00ecveis in sections of the end.This is a drum of building tire that has a central section (720) and two end sections (722, 724).Each section of the edge is equipped with a set of expandable bead lock (726). The central section, preferably, is expandable.The set of locking bead comprises a charger expandable ring (CR) and a plurality of elongated ties (k) which extend between the ring carrier (CR) and a plurality of radial segments.Expandable mind (s).When the ring clip moves inside (in the direction of the central section), the radially expandable segments (s) move radially to the outside.Carrying a plurality of spaced segments of finger ring, which extends axially (f) to the outside from a squatting position to an expanded position.And at least one position between them. In one mode of the invention, the set of locking bead comprises a cylinder and two pistons (P1, P2) arranged inside the cylinder.The pistons are free to move axially within the cylinder in response to pneumatic pressure.The first piston (P1) is constrained to move axially to the inside by rods (r1p1, r2p1, r3p1). The second piston (P2) is connected by rods (r1p2, r2p2, r3p2) to the ring clip.Pressurized air supplied through hoses (H1, H2, H3) and passageways in the cylinder (73) to control movement of the pistons (P1.P2) such that the set of locking bead can be partially expanded, fully expanded, and a position retracted, not expanded.