B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
152/78.1
B60C 17/00 (2006.01) B60C 3/04 (2006.01) B60C 13/00 (2006.01)
Patent
CA 2003756
An improvement is provided in a pneumatic safety tire having a pair of bead portions with a bead core, sidewall portions extending radially outward one from each of the bead portions, a tread portion extending between the side- wall portions, the tread portions being disposed outward of the carcass, a toroidal carcass extending through the tread and sidewall portions and turned up at the both edges around the bead cores, a belt disposed between the carcass and the tread and having cords laid at a relatively small angle relative to the equator of the tire, and a sidewall reinforcing layer disposed inward of the carcass in each sidewall portion. There are particularly specified rela- tionships in these parts of the tire, i.e.: the thickness of each sidewall gradually increases towards a 65% height point; the difference between the thickness at the 65% height point and the minimum thickness is particularly specified; each sidewall portion gradually increases in thickness from the 65% height point toward the maximum width portion; each sidewall portion gradually increases in thickness from the maximum width position toward a contact position; the thickness at the contact position is larger than the thickness at the maximum width position; the difference between the thickness at the contacting position and the thickness at the maximum width position is particu- larly specified; and the sidewall reinforcing layer is a crescent-shaped, three-layered structure in which a hard rubber strip having a specified Shore A hardness and 100% modulus is sandwiched between soft rubber strips, each having a specified Shore A hardness and 100% modulus.
Itoh Hiroshi
Kajikawa Akira
Kojima Yoshihide
Borden Ladner Gervais Llp
Sumitomo Rubber Industries Ltd.
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