基于全接触的鼓式制动器受力研究

为了更真实模拟制动器的工作状态,本文建立了鼓式制动器力学模型,并利用SolidWorks实体建模软件,建立鼓式制动器三维实体模型,同时将SolidWorks、HyperMesh和ANSYS相结合,对鼓式制动器全接触模型进行有限元分析。分析结果表明,在制动器工作状态下,凸轮轴的最大应力为1 253 MPa,分布在凸轮轴与制动凸轮交接处,超出了材料的强度极限;摩擦衬片的最大压力为5.192MPa,分布在从蹄靠近凸轮端,符合制动器工作的实际接触情况;制动蹄的最大应力为915.8MPa,分布在从蹄上制动凸轮促动力作用区域,这个区域出现了应力集中,应该对制动凸轮形状进行调整;支撑销的最大应力为226.2 MPa,分布在领蹄与支撑销接触区域,虽然没有超出材料的强度极限,但安全系数较小,应该适当增加支撑销轴轴径。该研究为鼓式制动器的改进设计提供了可靠依据。

Full Contact Stress Analysis of Drum Brakes

In order to simulate work state of the drum brake,a dynamic model for drum brake is established and the drum brake model is built by solid modeling software SolidWorks.Meanwhile SolidWorks and HyperMesh and ANSYS are combined together,and full contact model analysis of drum brakes has been carried out.The new analysis shows that under working conditions,the maximum stress of the camshaft is 1 253 MPa,it is distributed where the camshaft meets the brake cam and exceeds strength of material.The maximum stress of friction facing is 5.192 MPa,it is distributed on the trailing shoe and it is realistic.The maximum stress of brake shoe is 915.8 MPa,it is distributed on the zone of action which brings stress concentration.The shape of the brake cam should be adjusted.The maximum stress of the support pin is 226.2 MPa,it is distributed on the contact area between leading shoe and support pin.Its safety factor is lower and the diameter of axle of the support pin should be increased.It provided reliable reason for improvement and design of the drum brake.