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US 6,719,025 B2Granted
Dual composition tread band for tire
AssigneePirelli Pneumatici S.p.A.
InventorsRenato Caretta, Marco Nahmias Nanni
Life of this patent
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Abstract
A tire for a vehicle includes a radial carcass, a tread band disposed radially outward of the carcass, and a belt structure interposed between the carcass and the tread band. The tread band also includes a first portion of a first elastomeric compound having a first modulus of elasticity between about 12 MPa and 16 MPa, measured at 23° C., and a second portion of a second elastomeric compound having a second modulus of elasticity between about 7 MPa and 11 MPa, measured at 23° C. Additionally, a first tread pattern formed on the first portion is different from a second tread pattern formed on the second portion. A related tread band, method for making an asymmetrical tire, and wheel for a vehicle are also disclosed.
Claims15
A tread band for a vehicle tire, comprising:
- an asymmetrical design;
- a first portion of a first elastomeric compound;
- and
- a second portion of a second elastomeric compound;
- wherein the first portion comprises a first tread pattern,
- wherein the first portion further comprises a first dynamic modulus of elasticity,
- wherein the second portion comprises a second tread pattern,
- wherein the second portion further comprises a second dynamic modulus of elasticity,
- wherein the first tread pattern is different from the second tread pattern,
- wherein the first tread pattern comprises a greater net-to-gross ratio than the second tread pattern,
- wherein the first dynamic modulus of elasticity is different from the second dynamic modulus of elasticity, and
- wherein the first dynamic modulus of elasticity, measured at 23° C., is at least 1 MPa greater than the second dynamic modulus of elasticity, measured at 23° C.
9 more elements
A tire for a vehicle, comprising:
- a radial carcass;
- a tread band disposed radially outward of the carcass;
- and
- a belt structure interposed between the carcass and the tread band;
- wherein the tread band comprises:
- an asymmetrical design;
- a first portion of a first elastomeric compound;
- and
- a second portion of a second elastomeric compound;
- wherein the first portion comprises a first tread pattern,
- wherein the first portion further comprises a first dynamic modulus of elasticity,
- wherein the second portion comprises a second tread pattern,
- wherein the second portion further comprises a second dynamic modulus of elasticity,
- wherein the first tread pattern is different from the second tread pattern,
- wherein the first tread pattern comprises a greater net-to-gross ratio than the second tread pattern,
- wherein the first dynamic modulus of elasticity is different from the second dynamic modulus of elasticity,
- wherein the first dynamic modulus of elasticity, measured at 23° C., is greater than or equal to about 12 MPa and less than or equal to about 16 MPa, and
- wherein the second dynamic modulus of elasticity, measured at 23° C., is greater than or equal to about 7 MPa and less than or equal to about 11 MPa.
15 more elements
A tire for a vehicle, comprising:
- a radial carcass;
- a tread band disposed radially outward of the carcass;
- and
- a belt structure interposed between the carcass and the tread band;
- wherein the tread band comprises:
- an asymmetrical design;
- a first portion of a first elastomeric compound;
- and
- a second portion of a second elastomeric compound;
- wherein the first portion comprises a first tread pattern,
- wherein the first portion further comprises a first dynamic modulus of elasticity,
- wherein the second portion comprises a second tread pattern,
- wherein the second portion further comprises a second dynamic modulus of elasticity,
- wherein the first portion comprises a smaller number of grooves and notches than the second portion,
- wherein the first tread pattern is different from the second tread pattern,
- wherein the first dynamic modulus of elasticity is different from the second dynamic modulus of elasticity,
- wherein the first dynamic modulus of elasticity, measured at 23° C., is greater than or equal to about 12 MPa and less than or equal to about 16 MPa, and
- wherein the second dynamic modulus of elasticity, measured at 23° C., is greater than or equal to about 7 MPa and less than or equal to about 11 MPa.
15 more elements
A tread band for a vehicle tire, comprising:
- an asymmetrical design;
- a first portion of a first elastomeric compound;
- and
- a second portion of a second elastomeric compound;
- wherein the first portion comprises a first tread pattern,
- wherein the first portion further comprises a first dynamic modulus of elasticity,
- wherein the second portion comprises a second tread pattern,
- wherein the second portion further comprises a second dynamic modulus of elasticity,
- wherein the first tread pattern is different from the second tread pattern,
- wherein the first tread pattern comprises a greater net-to-gross ratio than the second tread pattern,
- wherein the first dynamic modulus of elasticity is different from the second dynamic modulus of elasticity,
- wherein the first dynamic modulus of elasticity, measured at 23° C., is greater than or equal to about 12 MPa and less than or equal to about 16 MPa, and
- wherein the second dynamic modulus of elasticity, measured at 23° C., is greater than or equal to about 7 MPa and less than or equal to about 11 MPa.
10 more elements
A method for making an asymmetrical tread band for a vehicle tire, comprising:
- providing a tread band comprising a first portion and a second portion;
- forming a first tread pattern on the first portion;
- and forming a second tread pattern on the second portion to thereby make an asymmetrical tread band;
- wherein the first portion comprises a first dynamic modulus of elasticity,
- wherein the second portion comprises a second dynamic modulus of elasticity,
- wherein the first tread pattern is different from the second tread pattern,
- wherein the first tread pattern comprises a greater net-to-gross ratio than the second tread pattern,
- wherein the first dynamic modulus of elasticity is different from the second dynamic modulus of elasticity,
- wherein the first dynamic modulus of elasticity, measured at 23° C., is at least 1 MPa greater than the second dynamic modulus of elasticity, measured at 23° C.,
- wherein a width of the second portion is greater than or equal to 25% and less than or equal to 80% of a combined width of the first and second portions, and
- wherein, when the tread band is disposed radially outward of a radial carcass of the tire, the first portion is disposed on a side of the tire adapted for facing away from a centerline of the vehicle and the second portion is disposed on a side of the tire adapted for facing toward a centerline of the vehicle.
8 more elements
A wheel for a vehicle, comprising:
- a rim;
- and
- a tire mounted on the rim;
- wherein the tire comprises:
- a radial carcass;
- sidewalls extending along edges of the carcass;
- a tread band disposed radially outward of the carcass;
- and
- a belt structure interposed between the carcass and the tread band;
- wherein the tread band comprises:
- an asymmetrical design;
- a first portion of a first elastomeric compound;
- and
- a second portion of a second elastomeric compound;
- wherein the first portion comprises a first tread pattern,
- wherein the first portion further comprises a first dynamic modulus of elasticity,
- wherein the second portion comprises a second tread pattern,
- wherein the second portion further comprises a second dynamic modulus of elasticity,
- wherein the first tread pattern is different from the second tread pattern,
- wherein the first tread pattern comprises a greater net-to-gross ratio than the second tread pattern,
- wherein the first dynamic modulus of elasticity is different from the second dynamic modulus of elasticity,
- wherein the first dynamic modulus of elasticity, measured at 23° C., is greater than or equal to about 12 MPa and less than or equal to about 16 MPa, and
- wherein the second dynamic modulus of elasticity, measured at 23° C., is greater than or equal to about 7 MPa and less than or equal to about 11 MPa.
20 more elements
Dependencies are inferred from the claim text.