Heavy duty radial tire with specified arrangement of chafer and carcass turnup
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 27, 2000
Grant Date -
N/A
app pub date -
Dec 31, 1998
filing date -
Jan 7, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A heavy duty radial tire comprises a carcass ply being turned up around bead cores from the axially inside to the outside of the tire, a bead apex disposed between the carcass main portion and each turnup portion, the turnup portion extending radially outwardly beyond the radially outer end of the bead apex so that the turnup portion has a parallel part which is placed adjacent to and substantially in parallel with the main portion, and a chafer disposed in each bead portion and extending radially outwardly beyond the radially outer end of the bead apex along the axially outside of the turnup portion. The thickness T2 of the chafer is 0.3 to 1.0 times the total rubber thickness T1 between the tire outer surface and the carcass when measured along a straight line drawn at a right angle to the carcass main portion through the radially outer end of the bead apex. The length L of the parallel part is in the range of 0.5 to 5.0 times a section width CW of the bead core. In the parallel part, the rubber thickness N between the carcass cords of the turnup portion and those of the main portion is 0.15 to 4.5 times the maximum diameter K of the carcass cords.
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