Truck tire with tread design for reducing abnormal wear
AssigneeCompagnie Generale Des Etablissements Michelin
InventorsPAUL ANDREW MAYNI, JEREMY TROWBRIDGE
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Abstract
A heavy truck tire is provided that includes a casing with a central axis, and a rubber tread that has a first layer and a second layer. The first layer is located farther from the central axis in a radial direction than the second layer. The first layer has a lower max tan(δ) than a max tan(δ) of the second layer. The max tan(δ) of the first layer is from 0.06-0.15, and the max tan(δ) of the second layer is from 0.12-0.27. The tire also has a sculptural feature that reduces irregular wear.
Claims17
A heavy truck tire, comprising:
- a casing, wherein the casing has a central axis;
- a rubber tread that has a rib that has a first layer and a second layer, wherein the first layer is located farther from the central axis in a radial direction than the second layer, wherein the first layer has a lower max tan(δ) than a max tan(δ) of the second layer, wherein the max tan(δ) of the first layer is from 0.06-0.15, wherein the max tan(δ) of the second layer is from 0.12-0.27;
- and
- a sculptural feature that reduces irregular wear, wherein the sculpture feature is selected from the group consisting of:
- a sacrificial rib;
- a micro sipe located at an edge of a rib of the tread that extends from an outer surface of the first layer in a direction towards the central axis in the radial direction;
- a directional micro sipe that extends from the outer surface of the first layer in a direction towards the central axis in the radial direction at a non-zero angle;
- and
- a directional sipe that extends from the outer surface of the first layer in a direction towards the central axis in the radial direction at a non-zero angle.
-7. (canceled)
A heavy truck tire, comprising:
- a casing, wherein the casing has a central axis;
- a rubber tread that has a rib that has a first layer and a second layer, wherein the first layer is located farther from the central axis in a radial direction than the second layer, wherein the first layer has a lower max tan(δ) than a max tan(δ) of the second layer, wherein the max tan(δ) of the first layer is from 0.06-0.15, wherein the max tan(δ) of the second layer is from 0.12-0.27;
- and
- a sculptural feature that reduces irregular wear;
- wherein the first layer has a complex shear modulus for 25% strain (G*25) at 60° C. that is from 1.2 MPa to 2.3 MPa, and wherein the second layer has a complex shear modulus for 25% strain (G*25) at 60° C. that is from 1.2 MPa to 2.3 MPa.
A heavy truck tire, comprising:
- a casing, wherein the casing has a central axis;
- a rubber tread that has a rib that has a first layer and a second layer, wherein the first layer is located farther from the central axis in a radial direction than the second layer, wherein the first layer has a lower max tan(δ) than a max tan(δ) of the second layer, wherein the max tan(δ) of the first layer is from 0.06-0.15, wherein the max tan(δ) of the second layer is from 0.12-0.27;
- and
- a sculptural feature that reduces irregular wear;
- wherein the complex shear modulus for 25% strain (G*25) at 60° C. of the first layer is less than the complex shear modulus for 25% strain (G*25) at 60° C. of the second layer.
Dependencies are inferred from the claim text.