汽车弹簧缸的密封性仿真与测试研究

Numerical simulation on sealing test model of brake chamber

由于汽车弹簧缸长期制动造成的气密性衰减,很难动态分析不同摩擦系数的密封圈对腔压泄露的影响。因此,该文利用双参数Mooney-Rivlin分析法,建立汽车弹簧缸的腔体密封性失效模型。该模型能根据密封圈的摩擦系数,动态计算出弹簧缸的气体泄漏量,通过腔压和泄漏量的比较,判断出密封圈是否失效。利用汽车弹簧缸气密性检测仪对某型弹簧缸进行测试,实验结果表明,当摩擦系数≤0.1时,密封圈应力分布最佳,腔体泄漏量<5 k Pa;当摩擦系数>0.1时,密封圈应力集中而产生气密性失效,腔体泄漏量超过5 k Pa。失效模型的仿真结果与试验结果相同,该失效模型正确有效。

Due to the attenuation of air impermeability, the gas leakiness of a brake chamber cannot be dynamically analyzed by its friction coefficient. Therefore, a sealing model of brake chamber is proposed based on the double parameters Mooney-Rivlin algorithm and the Von-Mises stress distribute model. The leakage rate, solved by this sealing model under different friction coefficient, is used for evaluating sealing failure of brake chamber. Besides, the sealing performance of a brake chamber is detected by a sealing tester of brake chamber to verify this sealing model. The experimental result shows that the leakage is less than 5 kPa when u ≦0.1 and the stress distribution of the seal ring is optimal.However, the leakage is greater than 5kP a when u> 0.1 by reason of the seal ring failure. It indicates that the sealing model of brake chamber is valid.