Pneumatic envelope of which each bead comprises two bead cores

Details Pneumatic envelope of which each bead comprises two bead cores Pneumatic envelope of which each bead comprises two bead cores

B - Operations, Transporting

60

C

B60C 15/04 (2006.01) B60C 15/024 (2006.01) B60C 15/05 (2006.01)

Patent

CA 2238909

Pneumatic envelope to be used on a hump rim, featuring each bead exhibiting the following: a) it comprises a main bead core around which is wrapped the casing ply and a secondary bead core positioned outside the casing ply; b) the internal diameter of the main bead core after mounting on the rim is greater than the diameter of the top of the hump and its maximum stretch is at most 1.5%; c) before mounting on the rim, the external diameter of the secondary bead core is smaller than the internal diameter of the main bead core; after mounting on the rim, the internal diameter of the secondary bead core is smaller than the diameter of the top of the hump: the internal diameter of the secondary bead core after mounting on the rim is 1.5% to 3% greater than the internal diameter of the secondary bead core prior to mounting on the rim and the maximum stretch of the secondary bead core is at least 3%.

Enveloppe de pneumatique utilisable sur jante avec hump, caractérisée en ce que chaque bourrelet présente les points suivants: a) il comporte une tringle principale autour de laquelle s'enroule la nappe carcasse et une tringle secondaire disposée en-dehors de la nappe carcasse; b) le diamètre intérieur de la tringle principale après montage sur la jante estsupérieur au diamètre du sommet du hump et son allongement élastique maximal est au plus égal à 1.5 %; c) avant montage sur la jante, le diamètre extérieur de la tringle secondaire est inférieur au diamètre intérieur de la tringle principale; après montage sur la jante, le diamètre intérieur de la tringle secondaire est inférieur au diamètre du sommet du hump: le diamètre intérieur de la tringle secondaire après montage sur la jante est supérieur de 1.5 à 3 % au diamètre intérieur de la tringle secondaire avant montage sur la jante et l'allongement élastique maximal de la tringle secondaire est d'au moins 3%.

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