Michelin Recherche Et Technique S.a.

Dean Bradley Creech

Luz M Restrepo

Philip Blair Webb

Mark E Collett

Joseph Nicholas Brown, Iv

Robert Vanstory Teeple

Sid H Bordelon

Tire tread

The tire of this invention has a belt package with a combination of a steel refinforced inner belt ply and an aromatic polyamide reinforced outer belt ply. The strength per unit width of the aromatic polyamide reinforced ply is made to be within 30 percent greater than the strength per unit width of the steel reinforced belt ply. The tire of this invention has angles of the aromatic polyamide reinforcing members from the mid-plane greater than the angles of the steel reinforcing members from the same mid-plane by 1 to 8 degrees. High impact endurance values are disclosed to be a function of the difference in bending stiffness values for each ply as well as a function of the composite shear stiffness values.

Tire with a specified two-ply steel-aramid belt package

The tire of this invention has a belt package with a combination of a steel refinforced inner belt ply and an aromatic polyamide reinforced outer belt ply. The breaking strength, tensile modulus, secant modulus and other material properties for the reinforcing members in each belt ply are defined. The strength per unit width of the aromatic polyamide reinforced ply is made to be within zero to 30 percent greater than the strength per unit width of the steel reinforced belt ply. The tire of this invention has angles of the aromatic polyamide reinforcing members from the mid-plane greater than the angles of the steel reinforcing members from the same mid-plane by 1 to 8 degrees. High impact endurance values are disclosed to be a function of the tensile modulus, breaking strengths and belt ply widths for each ply as well as a function of the composite shear stiffness values.

The tire of this invention has a silica-rich tread compound for excellent rolling resistance and tread wear properties. The tire is made to be conductive such that electrostatic charges on the vehicle can be quickly dissipated when the vehicle stops. An electrostatic discharge ring is located on at least one shoulder portion of the tire and has a relatively low volume resistivity, on the order of 100 megohm centimeter. The discharge ring is positioned to make contact with a conductive sidewall portion of the tire. The overall resistivity of the tire from the rim to the ground surface is made to be less than about 100 megohms.

Growing community of inventors

Easley, SC, United States of America

Dean Bradley Creech