Run-flat tire with tread reinforcing layer
AssigneeSumitomo Rubber Industries, Ltd.
InventorsMasanori Omoteda, Tetsuhiko Yoshioka, Kenji Tagashira
Life of this patent
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Abstract
A run-flat tire comprises a tread portion, a pair of bead portions, a pair of sidewall portions, a carcass comprising at least one carcass ply extending between the bead portions, a belt disposed radially outside the carcass in the tread portion, and a tread reinforcing layer disposed between carcass plies or alternatively between the carcass and belt, the tread reinforcing layer made of a high elastic modulus rubber compound having a complex elastic modulus E* of from 10 to 30 MPa, a thickness t of from 0.8 to 2.5 mm, and an axial width WA of 0.7 to 1.0 times the tread width TW of the tire.
Claims5
A run-flat tire comprising:
- a tread portion;
- a pair of bead portions;
- a pair of sidewall portions;
- a carcass comprising at least one carcass ply extending between the bead portions to form a carcass main portion;
- a belt disposed radially outside the carcass in the tread portion;
- a tread reinforcing layer disposed between carcass plies or alternatively between the carcass and belt;
- and
- the tread reinforcing layer being made of a high elastic modulus rubber compound having a complex elastic modulus E* measured at a temperature of 70.degree. C., a frequency of 10 Hz, and a dynamic distortion of 2% of from 10 to 30 MPa, a thickness t of from 0.8 to 2.5 mm, and an axial width WA of 0.7 to 1.0 times the tread width TW of the tire.
Dependencies are inferred from the claim text.