| 摘要 |
The invention is directed to a heavy duty radial tire having improved durability in the buttress at the radially upper portion of the sidewall. Such improvement is obtained by thickening the buttress region according to specific relationships between points on the sidewall profile. The sidewall profile is divided into a radially outer part extending from a point Q to a point R, a radially inner part extending between the tire maximum section point M and point R, and a middle part extending between points Q and R wherein the outer part is defined by a first circular arc arcing inwardly of the tire and the inner part is defined by a second circular arc arcing outwardly of the tire, the point R being the inflection point between the two arcs. Point Q is located at a radial height in the range of the edge height of the widest belt ply plus or minus 5 mm while point R is located radially inward of the tread edge in a range of 0.21 to 0.30 times the tread width and axially outward from the tire equator in a range of 0.52 to 0.57 times the tread width.
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