全钢巨型工程子午线轮胎胎圈结构设计

全钢巨型工程子午线轮胎的胎圈与轮辋直接接触，胎圈受力大，需要设计刚性足够的胎圈，以保障车辆行驶的稳定性。在保证胎圈刚性的同时，应考虑刚性的胎圈区域与柔软的胎侧区域如何过渡，以防止胎圈局部应力集中，发生胎圈折断、起鼓、材料脱层等问题。全钢巨胎的胎圈结构设计比较复杂，结构设计上除了采用合理的钢丝圈形状、足够的钢丝圈根数，刚性较高的钢丝帘布补强层，硬度很大的三角胶芯，来保证胎圈刚性，还需要在该部位设计合适的硬-软胶过渡、钢丝帘布层端点过渡，达到刚-柔过渡的良好平衡。采用有限元模拟方法，对全钢巨型工程子午线轮胎胎圈的受力情况进行分析，分析胎圈-轮辋配合紧密度、钢丝圈安全性、充气后胎圈轮辋接触情况、胎圈轮辋法向应力分布、胎圈Von Mises应力分布、负荷下轮胎轮辋接触情况，并进行胎圈优化设计，使得全钢巨胎胎圈受力状况合理，胎圈过盈配合恰当，并保证了轮胎的气密性。

structure design of bead of the all-steel giant engineering radial tire

As the bead of all-steel giant engineering radial tire contacts with the rim , the bead undertakes great pressure. It is necessary to design beads with enough rigidity, to ensure vehicles' stability in driving. While ensuring rigidity of bead, it needs to be considered as well on how to transit from the hard bead to the soft sidewall, so as to prevent stress from concentrating on a certain area of the bead, resulting in problems such as breaking, bulging or delamination of bead. Structure design of the bead of all-steel giant engineering radial tire is relatively complex. in addition to having bead ring with reasonable shape, bead wires with adequate quantity, bead reinforcing strip with high rigidity, and apex with high hardness to ensure bead rigidity, it is also necessary to design a proper transition from hard rubber to soft rubber and transition of bead reinforcing strip, so that a balanced hardness-softness transition will be achieved . With the finite-element method, analysis could be made on pressure-taking condition of the bead in all-steel giant engineering radial tire, e.g the closeness between bead and rim, the safety of bead ring, the contact between bead and rim after inflation, normal pressure on bead and rim, Von Mises stress distribution on bead, the contact between bead and rim under load. Besides, the designing of bead could be optimized. In this way, a result of reasonable bead pressure-taking condition and well fitted position could be achieved. And good airproof performance could be assured as well.