Heavy duty pneumatic radial tire having defined tire enlargement

Details Heavy duty pneumatic radial tire having defined tire enlargement Heavy duty pneumatic radial tire having defined tire enlargement

1990-01-12

1991-06-25

Weston, Caleb

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152544, 152552, B60C 300, B60C 304

Patent

active

050258443

ABSTRACT:
A heavy duty pneumatic radial tire including a pair of bead portions, a carcass consisting of one steel cord layer and extending between the bead portions, and a tread portion arranged radially outward of a crown portion of the carcass. A normal rim on which the tire is mounted has a bead seat at an angle of approximately 15.degree. relative to a rotating axis of the tire and engaging the bead portions of the tire. During filling the tire with inner pressure from 7% to 100% of a determined maximum inner pressure of the tire, a ratio A/B of an enlargement amount A of a shoulder in radial and outward directions to an enlargement amount B of the bead portion in axial and outward directions is within 0.25-0.7, preferably 0.3-0.55, where a radial and outward displacement of a shoulder positions J on the shoulder spaced by 10 mm from each end of said tread toward an equatorial plane of the tire is taken as the enlargement amount A of the shoulder in the radial and outward directions, and an axial outward displacement of a bead position K on the bead portion at a height of 21% of a tire sectional height H from a bead heel is taken as the enlargement amount B of the bead portion in axial outward directions.

REFERENCES:
patent: 3910336 (1975-10-01), Boileau
patent: 4037637 (1977-07-01), Arimura et al.
patent: 4076066 (1978-02-01), Verdier
patent: 4082132 (1978-04-01), Arai et al.
patent: 4258773 (1981-03-01), deSaint-Michel
patent: 4345634 (1982-08-01), Giron
patent: 4387758 (1983-06-01), Matsuda et al.

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