Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1983-11-08
1986-03-04
Boland, Lois E.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152539, B60C 906
Patent
active
045735115
ABSTRACT:
This pneumatic tire is of the type in which two belt-reinforcing layers crossing each other and at an angle of 15.degree. to 30.degree. with respect to the circumferential direction of the tire are laid over each other and over a carcass cord layer of a tread portion. The improvement lies in that the carcass cord layer consists of upper and lower layers; the lower carcass cord layer continues in its widthways direction so that each of its edges is turned up around one of a pair of right and left bead wires, respectively; the upper carcass cord layer has a split structure so that it is separated to the right and left at the tread portion; the edge portions of the upper carcass cord layer nearer the tread portion overlaps the belt-reinforcing layer to a width of at least 10 mm while the edge portions thereof nearer the bead portions are at a height of not more than 0.3 of the cross-sectional height of the tire measured from bead toe portions, and are separated from the bead wires; and the reinforcing cords of the upper and lower carcass cord layers are arranged so that the mean value 1/2(.alpha..sub.2 +.alpha..sub.1) of the angle .alpha..sub.2 of the reinforcing cords of the upper carcass cord layer and the angle .alpha..sub.1 of the reinforcing cords of the lower carcass cord layer is between 95.degree. to 120.degree., and the difference (.alpha..sub.2 -.alpha..sub.1) is between 10.degree. to 60.degree., measured from the side on which the angle of the reinforcing cords of the belt reinforcing layer adjacent to the upper carcass cord layer is an acute angle with respect to the circumferential direction of the tire.
REFERENCES:
patent: 4287929 (1981-09-01), Huinink
patent: 4469157 (1984-09-01), Horikawa et al.
Kabe Kazuyuki
Morikawa Tuneo
Boland Lois E.
The Yokohama Rubber Co. Ltd.
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