Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1989-03-15
1990-08-14
Ball, Michael W.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152554, 152560, B60C 918
Patent
active
049479172
ABSTRACT:
A radial tire for a motorcycle comprising a carcass ply and a breaker disposed radially outside thereof and comprising a first ply lying on the carcass ply and a second ply lying radially outside the first ply, wherein the carcass ply is composed of cords arranged radially at an angle of 70 to 90 degrees to the tire equator and having an elastic modulus MC of 250 to 600 kgf/sq.mm; the first ply of the breaker being composed of cords arranged at an angle of 10 to 30 degrees to the tire equator and having a elastic modulus MB1 of 450 to 1100 kgf/sq.mm; the second ply of the breaker being composed of aromatic polyamide cords arranged at an angle of 10 to 30 degrees to the tire equator and having a elastic modulus MB2 of 650 to 1600 kgf/sq.mm; the elastic modulus MB2 of the second ply cords being larger than the elastic modulus MB1 of the first ply cords; the elastic modulus MB1 of the first ply cords being larger than the elastic modulus MC of the carcass ply cords; and the difference MB2-MB 1 and the difference MB1-MC are in the range of 200 to 500 kgf/sq.mm.
REFERENCES:
patent: 3287324 (1966-11-01), Sweeny
patent: 3404721 (1968-10-01), Massoubre
patent: 3675703 (1972-07-01), Watts et al.
J. Preston, "Aramid Fibers," Encyclopedia of Chemical Technology, Kirk-Othmer, ed., 3rd ed., 1978, pp. 213-242.
Kadomaru Kazuo
Kouno Tadao
Noma Hiroyuki
Ball Michael W.
Knable Geoffrey L.
Sumitomo Rubber Industries Ltd.
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