160 km/h工程车车轮热负荷研究及强度分析

Research on Thermal Load and Strength Analysis of 160 km/h Construction Vehicle Wheel

以160 km/h工程车的车轮为研究对象,运用有限元分析方法,分析了车轮轮径、制动缸压力和环境温度对车轮热负荷的影响,并计算了热载荷对车轮强度的影响。有限元分析结果表明,初始条件相同时,大轮径车轮踏面的最高温度低于小轮径车轮;制动缸压力和环境温度影响车轮踏面达到最高温度所用的时间,初始值越大,用时越短,但随后踏面温度下降却越快。热载荷对车轮强度主要有2个方面的影响:其一,影响车轮最高应力的位置,施加热载荷后最高温度由轮毂孔附近变为踏面位置;其二,影响车轮的最大应力值,热-机载荷共同作用下车轮的最大应力值在各工况下均有不同幅度的增大。

Talking the wheels of 160km/h engineering vehicle as the research object,the influence of wheel diameter,brake cylinder pressure and environment temperature on the wheel thermal load was studied by using the finite element analysis method.At the same time,the influence of thermal load on wheel strength was calculated.The results of finite element analysis show that:when the initial conditions are the same,the maximum temperature of the tread of the large diameter wheel is lower than that of the small diameter wheel;the brake cylinder pressure and environment temperature affect the time for the wheel tread to reach the maximum temperature,the larger the initial value is,the shorter the time is,but then the faster the tread temperature drops.The thermal load has two main effects on the strength of the wheel:firstly,the position of the highest stress of the wheel is affected,and the highest temperature changes from near the wheel hub hole to the tread position after applying the thermal load;secondly,the maximum stress value of the wheel is affected,the maximum stress value of the wheel under the combined action of thermal and mechanical load increases in different ranges under different working conditions.