Pneumatic radial tires for passenger cars having low rolling res

Details Pneumatic radial tires for passenger cars having low rolling res Pneumatic radial tires for passenger cars having low rolling res

1983-11-14

1985-07-09

Boland, Lois E.

Resilient tires and wheels

Tires, resilient

Anti-skid devices

152454, 152526, 152549, 152560J, B60C 920, B60C 1100, B60C 100

Patent

active

045276064

ABSTRACT:
A pneumatic radial tire for passenger cars having a low rolling resistance and an excellent wet skid resistance is disclosed. The radial tire comprises a carcass of a radial construction toroidally extending between a pair of bead cores with the ends turned thereover, a tread portion arranged outside a crown portion of the carcass and having a two laminate structure of tread base rubber and tread cap rubber, and a reinforcing belt layer embedded in the tread base rubber and superimposed about the crown portion of the carcass. The tread base rubber and tread cap rubber have resiliences of not less than 65% and not more than 60%, respectively. The tread portion has a sectional ratio of a sectional area of the tread cap rubber occupied in the equatorial section of tire to a total sectional area of the tread portion of not less than 50% and a negative ratio of not more than 45%. The belt layer has a flatness of not more than 15%.

REFERENCES:
patent: 1769694 (1930-07-01), Jenkinson
patent: 3517218 (1964-11-01), Brown
patent: 3707177 (1972-12-01), Boileau
patent: 3759306 (1973-09-01), Greiner et al.
patent: 4319619 (1982-03-01), Kozima et al.

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