Heavy-duty pneumatic radial tire

Details Heavy-duty pneumatic radial tire Heavy-duty pneumatic radial tire

B - Operations, Transporting

60

C

152/95.2

B60C 15/06 (2006.01)

Patent

CA 1305027

ABSTRACT A heavy-duty pneumatic radial tire with a radial structure having at least two reinforcing layers provided on the outside of a turnup portion formed by turning up the end of a carcass ply about a bead core from the inside of the tire towards the outside of the tire, wherein a rubber stock is provided in the inside of the outer reinforcing layer so as to cover the end of said turnup portion and the end of the innermost reinforcing layer and wherein the rubber stock contains a cobalt salt in an amount of 0.1 to 0.4 parts by weight per 100 parts by weight of rubber in terms of cobalt element and having the dynamic modulus M2 higher than the dynamic modulus M1 of coat rubber of the carcass ply and in the range of from 10 to 15 MPa and a thickness d, defined as a distance from the inside surface of the outer reinforcing layer to the end of the turnup portion, 1.0 to 4.0 times larger than the diameter r2 of the reinforcing cord constituting the innermost reinforcing layer.

540138

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