With a pneumatic tire not mounted on a rim, in a meridian cross-section a first line is parallel with an innermost bottom side of a bead core in a radial direction and passes through an outermost projection of the bead core in a lateral direction, a second line is orthogonal with the first line at the outermost projection, a third line is orthogonal with the first line and passes through an intersection of a rim cushion rubber, a distance between the second and third lines is 2.0 to 4.0 mm, a shortest distance between an innermost projection of the bead core in the lateral direction and a cord of a carcass layer is 0.6 to 1.4 mm, and a shortest distance between an innermost end of the bottom side of the bead core in the lateral direction and the cord of the carcass layer is 1.2 to 2.2 mm.

A heavy-duty pneumatic tire includes a section width being equal to or less than 335 mm, an aspect ratio being equal to or less than 55%, and a toroidal carcass extending between axially spaced bead portions through a tread portion and sidewall portions, wherein the carcass includes a carcass ply which includes a main portion and a turn-up portion, a belt layer disposed radially outward of the carcass in the tread portion, a sidewall rubber defining an outer sidewall profile of each sidewall portion, and a chafer rubber defining an outer bead profile of each bead portion, wherein in each bead portion, on a straight line that is perpendicular to the main portion of the carcass ply and passes a radially inner end of the sidewall rubber, the chafer rubber has a thickness of from 40% to 60% of a thickness of the bead portion.

A pneumatic tire includes a carcass ply extending from one bead structure to another bead structure. Each bead structure includes a plurality of circumferentially wound metal wires surrounding a bead core. The bead core having a planar upper surface, a planar lower surface, and curved side surfaces. The planar upper surface and the planar lower surface both define cylindrical rings having rotational axes coincident with a rotating axis of the pneumatic tire.

A pneumatic tire to reduce separation of a carcass ply from inner and outer core pieces (5i, 5o) and improve steering stability. A radially inner end portion of the carcass ply is held between the inner and outer core pieces (5i, 5o) without turning-up around a bead core. The inner and outer core pieces (5i, 5o) are made of helical body of bead cord (10i, 10o) helically winding around a tire axis. In the inner core piece (5i), the final twisting direction of the bead cord (10i) is the same as the winding direction around the tire axis of the bead cord (10i) in side view from axial outward of the tire. In the outer core piece (5o), the final twisting direction of the bead cord (10o) is opposite to the winding direction of the bead cord (10o).

A method and system is disclosed for increasing damping capacity in a pneumatic tire by utilizing an extruded vibration-damping rope comprising a bundle of individual wires encased by a polymerized outer sheath. The rope is embedded into the tire during the molding process. The individual wires allow inter-wire friction to occur during part vibration. The core of the disclosed inventive concept for embedding in the tire comprises a bundle of wires having an outermost layer and a polymerized sheath formed over the bundle of wires. The sheath has an inner layer. At least some of the wires of the outermost layer of wires are embedded in the inner layer, whereby sliding movement of the surfaces of the wires relative to one another dampens resonant tire vibration. The wires are metal and the sheath is composed of a polymerized material that is preferably impermeable to the in-flow of rubber.

A bead core for a tire is provided. The bead core is formed from a carbon fiber composite. The bead is formed into the shape of a hoop or ring before the carbon fiber composite is fully cured. The strain present in the carbon fiber composite after forming the ring, via finally curing with energy sources (218) the carbon fiber composite firstly treated with a resin bath and shaped as a precursor (214), which is then wrapped onto a roller (216) before curing, is carefully controlled to be less than 0.1 percent. A tire incorporating such a bead core within the bead portions of the tire can have improved weight relative to a tire with conventional, steel bead core constructions.

The tire has a load index that is at least 118 and two layers of reinforcing elements. Each of the layers has a breaking force per unit width that is higher than 2900 daN/dm. A minimum strength per unit width, measured for an elongation of less than 10%, of the second layer is greater than 20% of the minimum strength per unit width, measured for an elongation of less than 10%, of the first layer. The reinforcing elements of the first layer have a thread count that is higher than 300 tex. The reinforcing elements of the two layers have a thread count of less than 750 tex. The elongation of the reinforcing elements of the second layer are greater than 8% under a force of 20 daN and the secant elastic modulus values under tension at 10% elongation, Mt, Mj, satisfy the relationship Mt/Mj1.

In one general aspect, the present disclosure provides a bead-apex assembly for a vehicle tire. The bead-apex assembly may include a bead with an outer diameter surface, and an apex with a first layer and a second layer, the first layer having an inner diameter located adjacent to the outer diameter surface of the bead, and the second layer having an inner diameter located adjacent to an outer diameter of the first layer.

A bead wire for a tire includes a core, an outer layer, and at least one intermediate layer. The core includes at least one yarn of a multifilament textile fiber embedded in an organic matrix. The outer layer includes an outer-layer metal wire wound around the core. Each intermediate layer includes an intermediate-layer metal wire wound around the core. Each intermediate layer is disposed between the core and the outer layer.

A foldable tire includes a tire main body provided at two edges thereof with two tire beads respectively. A plurality of rings are disposed in each of the tire beads. Each of the rings has a reinforcing core, which includes a plurality of flexible steel filaments helically entwined with each other and has a diameter ranging from 0.2 millimeters to 0.5 millimeters, and a cladding layer clothing the reinforcing core, so that the reinforcing cores located in each of the tire beads are separated from each other.