6.50R16 8PR轻载子午线轮胎胎圈裂口问题的解决措施

造成６．５０Ｒ１６８ＰＲ轻载子午线轮胎胎圈裂口的主要原因是轮胎结构设计不合理和使用不当。从结构设计上，应增大轮辋宽度及调整上下胎侧曲线等；从施工设计上，采用上下复合三角胶及用２层尼龙加强层替代原一层钢丝加强层等；从工艺设计上，调整成型工艺参数并相应调整成型压力参数等。改进后进行了成品试验。试验结果表明，改进后轮胎外缘尺寸符合国标，耐久性能提高１７０％，行驶里程延长１倍左右。

Precautions for Bead Failure of 6 50R16 8PR Radial Light Truck Tire

The bead failure of 6 50R16 8PR radial light truck tire mainly resulted from the unreasonable structure design and the improper operation conditions.As to structure design,the rim width increased and the curve on lower sidewall was adjusted;in terms of construction design,the upper and lower apex assembly was used,and two layers of nylon ply were used as bead reinforcement instead of the exist one layer wire ply;with regards to processing technology design,the building parameters were adjusted.It was found through the test on the improved finished tire that the overall diameter of the improved tire was in accordance with the requrements in the national standard,the endurance life increased by 170% and the tread life by 100%.