Run flat tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorsDaichi Aoki, Hiroki Nakajima
Life of this patent
Estimating the term…
Abstract
Provided is a run flat tire comprising a side reinforcing layer on a sidewall part, wherein a rubber composition of the side reinforcing layer has a complex elastic modulus at 100° C. (E*100) of 5.0 to 17 MPa and a loss tangent at 60° C. (60° C. tan δ) of 0.020 to 0.100 MPa, and wherein, where a tire cross-sectional width is defined as Wt (mm) and a tire outer diameter is defined as Dt (mm), Wt and Dt satisfy any of the following inequality (1), (2), and (3): Wt<225 and Dt≥59.078×Wt{circumflex over ( )}0.460 (1) 225≤Wt<235 and Dt≥59.078×Wt{circumflex over ( )}0.620−967.673 (2) 235≤Wt and Dt≥Wt{circumflex over ( )}0.6+750 (3)
Claims4
A run flat tire comprising a side reinforcing layer on a sidewall part,
- wherein the side reinforcing layer comprises a rubber composition comprising a rubber component,
- wherein the rubber composition of the side reinforcing layer has a complex elastic modulus at 100° C. (E*100) of 5.0 to 17.0 MPa and a loss tangent at 60° C. (60° C. tan δ) of 0.020 to 0.100,
- wherein a ratio of the loss tangent at 60° C. (60° C. tan δ) of the rubber composition to a tire cross-sectional width Wt in mm (60° C. tan δ/Wt) is less than 4.5×10−4,
- wherein the 60° C. tan δ of the rubber composition is 0.025 to 0.049, and
- wherein, where a tire outer diameter is defined as Dt in mm, Wt and Dt satisfy any of the following inequalities:
- Wt<225 and Dt≥59.078×Wt{circumflex over ( )}0.460
- 225≤Wt<235 and Dt≥59.078×Wt{circumflex over ( )}0.620−967.673
- 235≤Wt and Dt≥Wt{circumflex over ( )}0.6+750.
Dependencies are inferred from the claim text.