Heavy duty pneumatic tire
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United States of America Patent
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Feb 28, 1989
Grant Date -
N/A
app pub date -
Nov 18, 1986
filing date -
Nov 18, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A heavy duty pneumatic radial tire for use under a high speed and a high internal pressure, is disclosed, which comprises a plurality of carcass cord layers of which cords are arranged at an angle from 90.degree. to 75.degree. with respect to a circumferential direction of the tire. The cords are composed of fibers of an aromatic polyamide having not less than 80 mole % of a repeating unit expressed by the following formula: --NH--Ar.sub.1 --NHCO--Ar.sub.2 --CO-- in which Ar.sub.1 and Ar.sub.2 denote at least one kind of an aromatic residue selected from: ##STR1## Elongation E.sub.n (%) of the aromatic polyamide fibers constituting the respective plies meets the following inequation: E.sub.n-1 +0.2.ltoreq.E.sub.n .ltoreq.E.sub.n-1 +2.0 in which E.sub.n is an elongation (%) of the n-th layer of the carcass cord layers, provided that the carcass cord layers are taken as 1st ply, 2nd ply, 3rd ply, . . . , n-th ply from the inner liner side in which n is an integer of 2 or more, and E.sub.1 may take any arbitrary value.
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