Pneumatic tire
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United States of America Patent
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Jun 21, 1988
Grant Date -
N/A
app pub date -
Apr 8, 1986
filing date -
Apr 8, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pneumatic tire comprises an annular tread at a central portion, a pair of side wall portions, bead portions, a carcass extending between both bead wires, and a breaker composed of two or more cord layers with cords arranged at a cord angle of 5-60.degree. relative to the circumferential direction and between the tread and the carcass and intersecting in the adjacent plies. The cords constituting the carcass or the breaker are substantially made of polytetramethylene adipamide (4,6-nylon), and as buried in a rubber of the tire, have the following characteristics: 5.0(%).ltoreq.E.sub.2 .ltoreq.9.0(%) E.sub.2 +.DELTA.S.ltoreq.13.0(%) where E.sub.2 is an elongation (%) at 2.0 g/d, and .DELTA.S is a heat shrinkability (%) when measured in the state that the cords are left at 177.degree. C. under application of load of 20 g/cord for 30 minutes and kept as it is. The burying rubber has the following characteristics: 20 kg/cm.sup.2 .ltoreq.M.sub.100(%) .ltoreq.60 kg/cm.sup.2 where M.sub.100 % is a stress at 100% elongation of the rubber.
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