梅花形密封圈密封性能的有限元分析

Finite element analysis of sealing performance of quincunx seal ring

针对钳盘式制动器制动活塞采用传统的O形橡胶密封圈容易存在局部变形、弹性不足致使密封失效等问题,为了提高制动活塞的密封性能设计了一种梅花形密封圈。利用Ansys Workbench软件建立了梅花形密封圈有限元模型,对其进行了热—结构耦合场的有限元分析,并与传统的O形密封圈进行了对比。结果表明:梅花形密封圈的Von·Mises应力和接触应力随着摩擦因数增大而缓慢减小,并且随着介质压力增大而增大,同时,其特殊的截面结构使得Von·Mises应力随着预压缩量的增大而减小;相比O形密封圈,梅花形密封圈的最大Von·Mises减小了10.39%,最大接触应力减小了10.29%,温度场的最高温度降低了28.3%。梅花形密封圈应力变化波动较小,可避免应力集中,其密封性能优于O形密封圈,使用寿命也较长。

Aimed at the problems of local deformation,insufficient elasticity and failure of traditional seal O-ring of the brake piston of caliper disc brake,a kind of quincunx seal ring is designed to improve the sealing performance of brake piston of caliper disc brake.Firstly,finite element model of quincunx-ring was established,and the temperature field and thermal stress coupling field was analyzed by using Ansys Workbench.By comparing with the O-ring,the results show that the Von·Mises stress and contact stress of quincunx-ring decrease slowly with the increase of friction coefficient and increase with the medium pressure increasing.The Von·Mises stress of quincunx-ring decreases with the increasing of pre-compression because of its special section structure.The Von·Mises stress of quincunx-ring is reduced by 10.39%,the contact stress is reduced by 10.29%and the maximum value of the temperature field is reduced by 28.3%compared with the O-ring.The stress of quincunx-ring show small changes without stress concentration and the sealing performance is better than that of O-ring.The working life of the ring can be increased.