履带车辆干片式制动器圆锥滚子加压机构研究

Research on Tapered Roller Pressurized Structure of Dry Disk Brake for Tracked Vehicle

为了提高履带车辆干片式制动器服役性能,提出了一种新型圆锥滚子加压机构,并对其结构性能进行研究.将滚子母线延长线与加压机构轴线相交保证圆锥滚子与制动器的纯滚动条件.提出圆弧全凸型和圆弧修正型等结构改善圆锥滚子力学特性.采用显式有限元方法建立圆锥滚子的数值仿真模型,基于罚函数接触算法对典型制动条件下的球形弹子、圆锥滚子及其改进型进行了结构分析.结果表明新型圆锥滚子将球形弹子的点接触转换为线接触,圆弧全凸型和圆弧修正型能够消除直线型圆锥滚子的边缘效应问题,圆弧全凸型圆锥滚子不仅能显著降低最大有效应力,并且应力沿着轴线方向分布非常均匀,显著改善了转动盘和弹子的受力状态.

To improve the service performance of the dry disc brakes for tracked vehicles,a novel pressurized structure based on the taper roller is proposed and studied.The extension of generatrix is intersected with the axis of pressurized structure to guarantee the pure rolling condition for the taper roller and brake.The full arc convex and arc modified form are given to improve the mechanical performance of tapered roller.Based on penalty contact algorithm,the circular arc,tapered roller and improved types are analyzed and compared using explicit finite element method under typical brake condition.Numerical simulation results show that the stress state is great improved because the proposed roller is line contact instead of point contact of spherical billiard.The full arc convex and arc modified form can eliminate the boundary effect of roller.Not only the maximum effective stress is reduced,but also the uniform stress along axis is guaranteed for the full arc convex roller.