Pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorDaisuke Todoroki
Life of this patent
Estimating the term…
Abstract
In a tire 2 of the present invention, sidewalls 6 each include an outer layer 6a, and an inner layer 6b disposed inward of the outer layer 6a in the axial direction. The inner side end, in the radial direction, of the inner layer 6a extends to a region between a bead 10 and a chafer 8. When Po represents a contact point, on an outer surface of the tire 2, at which the outer layer 6a and the chafer 8 contact with each other, an inner side end, in the radial direction, of the outer layer 6a is equal to the contact point Po. In the radial direction, an outer side end 44 of the chafer 8 is disposed outward of the contact point Po. In the radial direction, an inner side end 46 of the inner layer 6b is disposed inward of the contact point Po.
Claims9
A pneumatic tire comprising:
- a tread having an outer surface which forms a tread surface;
- a pair of sidewalls that extend almost inward from ends, respectively, of the tread in a radial direction;
- chafers disposed inward of the sidewalls, respectively, in the radial direction;
- and
- a pair of beads disposed inward of the chafers, respectively, in an axial direction,
- wherein each bead includes a core,
- wherein the sidewalls each include an outer layer, and an inner layer disposed inward of the outer layer in the axial direction, the inner layer extends to a region between a corresponding one of the beads and a corresponding one of the chafers,
- wherein in the radial direction, an outer side end of the inner layer is disposed outward of an outer side end of the bead,
- wherein in the radial direction, an inner side end of the inner layer is disposed inward of an outer side end of the core,
- wherein an outer side end of the inner layer reaches the tread, and
- wherein the outer layer contacts with a corresponding one of the chafers,
- wherein
- when Po represents a contact point, on an outer surface of the tire, at which the outer layer and a corresponding one of the chafers contact with each other, an inner side end, in the radial direction, of the outer layer is equal to the contact point Po, in the radial direction, an outer side end of each chafer is disposed outward of the contact point Po, and in the radial direction, an inner side end of the inner layer is disposed inward of the contact point Po,
- a loss tangent LTi of the inner layer is less than a loss tangent LTo of the outer layer and a loss tangent LTc of the chafers, and
- a ratio (Hi/12.7 mm) of a height Hi, in the radial direction, from a bead base line BBL to the inner side end of the inner layer, relative to a height of 12.7 mm, in the radial direction, from the bead base line BBL to an outer side end of a flange of a rim on which the tire is mounted, is greater than or equal to 0.0 and not greater than 1.5.
Dependencies are inferred from the claim text.