Tire
AssigneeBridgestone Corporation
InventorYoshikazu Kibayashi
Life of this patent
Estimating the term…
Abstract
A tire (1) in which a carcass fold-back portion (40) is wound around a bead core (10) includes a hard bead filler (50) arranged on an outer side of a carcass (20) in the tread width direction (twd), the hard bead filler (50) extends, along a tire radial direction (trd), from an outer side of the bead core (10) at least to a center (BO) of the bead core (10), and a thickness (t) of the hard bead filler (50) along the tread width direction (twd) is not shorter than 0.5 mm on a straight line (L) passing over the center (BO) of the bead core (10) in the tread width direction (twd).
Claims5
A tire that includes a pair of bead cores, and a carcass that extends between the pair of bead cores, wherein the carcass includes a carcass main portion that extends between the pair of bead cores, and carcass fold-back portions that are folded back to outsides, along a tread width direction, of the pair of bead cores, respectively, and the carcass fold-back portions are wound around the bead cores, respectively, and each of the carcass fold-back portions includes a carcass outer-side end that is an outer-side distal end in a tire radial direction, the tire comprises:
- a hard bead filler that is arranged on an outer side of the carcass in the tread width direction;
- and
- a soft bead filler that is softer than the hard bead filler, the hard bead filler and the soft bead filler being completely embedded in the tire, wherein:
- the hard bead filler extends, along the tire radial direction, from an outer side of the bead core at least to a center of the bead core,
- the soft bead filler is located between the carcass outer-side end and the hard bead filler along the tire radial direction, such that the carcass outer-side end is separated from the hard bead filler by the soft bead filler, and
- a thickness of the hard bead filler along the tread width direction is not shorter than 0.5 mm on a straight line passing over the center of the bead core in the tread width direction,
- wherein:
- a length, along the tire radial direction, of a region where the hard bead filler and the carcass main portion contact with each other is a contact length L,
- a length, along the tire radial direction, from an outer-most surface of a tread surface that contacts with a road surface in the tire radial direction to a bead toe that is an inner-most portion of a bead portion in the tire radial direction is a tire height H, and
- a ratio L/H of the contact length L to the tire height H is not smaller than 0.2 and not larger than 0.5.
Dependencies are inferred from the claim text.