Tire, tire mold, and tire production method
AssigneeSumitomo Rubber Industries, Ltd.
InventorMasahiro Nagase
Life of this patent
Estimating the term…
Abstract
A tire includes a tread, a pair of sidewalls, a pair of beads, and a carcass. Each bead includes a core and an apex. In the tire in the normal state, a ratio (HA/HS) of a distance HA in a radial direction from a bead base line to an outer end PA of the apex to a tire cross-sectional height HS may not be less than 20% and/or may not be greater than 30%, and an angle of a line segment connecting between the outer end PA of the apex and a center PM of a width, in an axial direction, of a contact surface of the apex at which the apex is in contact with the core, relative to the bead base line, may not be less than 45° and/or may not be greater than 55°.
Claims4
A tire having a speed range from W to Y in a speed rating chart, where W is 270 km/h and Y is 300 km/h, the tire comprising:
- a tread configured to come into contact with a road surface;
- a pair of sidewalls continuous with ends of the tread, the pair of sidewalls disposed inwardly of the tread in a radial direction;
- a pair of beads disposed inwardly of the sidewalls in the radial direction;
- and
- a carcass extending on and between one of the beads and another of the beads in portions inward of the tread and the pair of sidewalls,
- wherein the beads include cores and apexes disposed outwardly of the cores in the radial direction, and
- wherein, in a normal state in which the tire is mounted on a normal rim, an internal pressure is adjusted to a normal internal pressure, and no load is applied:
- a ratio of a distance in the radial direction from a bead base line to an outer end of each said apex, to a tire cross-sectional height, is not less than 20% and not greater than 30%, and
- an angle of a line segment connecting between the outer end of each said apex and a center of a width, in an axial direction, of a contact surface of the apex at which the apex is in contact with a corresponding one of the cores, relative to the bead base line, is not less than 45° and not greater than 55°,
- wherein a vertical deflection B100 and a ground contact area A100, and a vertical deflection B73 and a ground contact area A73 satisfy the following Equation (1), where B100 and A100 represent the vertical deflection and the ground contact area, respectively, obtained when a first load represented by a load index is applied as a vertical load to the tire in the normal state, and B73 and A73 represent the vertical deflection and the ground contact area, respectively, obtained when a second load that is 73% of the load represented by the load index is applied as a vertical load to the tire in the normal state:
- 1.03
- ≤
- (
- B
-
- 100
-
- /
-
- B
-
- 73
- )
-
- /
-
- (
- A
-
- 100
-
- /
-
- A
-
- 7
-
- 3
- )
- ≤
- 1.06
- .
- Equation
-
-
- (
- 1
- )
Dependencies are inferred from the claim text.