Pneumatic tire
AssigneeToyo Tire Corporation
InventorKunihiko Nagai
Life of this patent
Estimating the term…
Abstract
A pneumatic tire includes a pair of bead cores; a pair of bead fillers; a carcass ply that is suspended between the pair of bead cores; a side wall rubber that is arranged on a tire-outer-surface-side of the carcass ply and constitutes a tire outer surface; a chafer layer that is rolled up from a tire-inner-surface-side to the tire-outer-surface-side of the carcass ply around the bead cores and the bead fillers; and a pad rubber that is arranged between the side wall rubber and the carcass ply to be adjacent to a rolled-up end of the chafer layer in a tire width direction, the pad rubber having a modulus value higher than that of the side wall rubber. The pad rubber includes a constant thickness portion having a substantially constant thickness over a range of 7% or more but not exceeding 26% of a tire reference cross-section height.
Claims9
A pneumatic tire comprising:
- a tread part;
- a pair of side wall parts that extend radially inwardly from widthwise ends of the tread part;
- a pair of bead parts located at respective radially inner ends of the pair of side wall parts, each bead part comprising a bead core and a bead filler that is connected to the bead core and extends to an outer-diameter-side in a tire radial direction;
- a carcass ply that is suspended between the bead cores;
- a side wall rubber in each side wall part that is arranged on a tire-outer-surface-side of the carcass ply and constitutes a tire outer surface;
- a chafer layer in each side wall part that is arranged adjacent to the outer surface of the carcass ply and is turned up from a tire-inner-surface-side to the tire-outer-surface-side around the bead core and the bead filler and rolled up to the outer-diameter-side in the tire radial direction together with the carcass ply;
- and
- a pad rubber in each side wall part that is arranged between the side wall rubber and the carcass ply so as to be adjacent to a tire-outer-surface-side rolled-up end of the chafer layer in a tire width direction, the pad rubber having a 100% modulus value higher than that of the side wall rubber,
- wherein the pad rubber includes a constant thickness portion having a substantially constant thickness over a range of 7% or more but not exceeding 26% of a tire reference cross-section height, and
- the constant thickness portion is located entirely on an outer-diameter-side in the tire radial direction with respect to the rolled-up end of the chafer layer.
A pneumatic tire comprising:
- a tread part;
- a pair of side wall parts that extend radially inwardly from widthwise ends of the tread part;
- a pair of bead parts located at respective radially inner ends of the pair of side wall parts, each bead part comprising a bead core and a bead filler that is connected to the bead core and extends to an outer-diameter-side in a tire radial direction;
- a carcass ply that is suspended between the bead cores;
- a side wall rubber in each side wall part that is arranged on a tire-outer-surface-side of the carcass ply and constitutes a tire outer surface;
- a chafer layer in each side wall part that is arranged adjacent to the outer surface of the carcass ply and is turned up from a tire-inner-surface-side to the tire-outer-surface-side around the bead core and the bead filler and rolled up to the outer-diameter-side in the tire radial direction together with the carcass ply;
- and
- a pad rubber in each side wall part that is arranged between the side wall rubber and the carcass ply so as to be adjacent to a tire-outer-surface-side rolled-up end of the chafer layer in a tire width direction, the pad rubber having a 100% modulus value higher than that of the side wall rubber,
- wherein the pad rubber includes a constant thickness portion having a substantially constant thickness over a range of 7% or more but not exceeding 26% of a tire reference cross-section height,
- the constant thickness portion is located entirely on an outer-diameter-side in the tire radial direction with respect to the rolled-up end of the chafer layer, and
- the pad rubber is formed into a long trapezoidal shape in the tire radial direction such that an inner curvilinear surface of the pad rubber, which comes in contact with outer surfaces of the chafer layer and the carcass ply, is longer in the tire radial direction than an outer curvilinear surface of the pad rubber which extends substantially parallel to the inner curvilinear surface and comes in contact with an inner surface of the side wall rubber so that the trapezoidal shape has straight sides connecting the curvilinear long and short sides.
Dependencies are inferred from the claim text.