T形气缸盖罩垫密封性能的有限元分析

Finite Element Analysis of Sealing Performance of T Profile Cylinder Head Cover Gasket

运用有限元软件对平型、加强筋型和凸台型T形缸垫的应力、应变以及接触应力分布规律进行研究,对比分析这几种T形缸垫的密封性能。结果表明,加强筋能提高缸垫的密封能力,但不同的加强筋结构对密封能力有着不同的影响,设计不合理的加强筋,还容易导致T形气缸盖罩垫过快失效和老化。平型气缸盖罩垫适用于密封周期长但密封力要求不高的情况;而加强筋型气缸盖罩垫则适用于密封力要求高但密封周长不长的情况;凸台型气缸盖罩垫的综合性能高,能满足密封周期长和密封力要求比较高的情况。

The distributions of the stress, strain and contact stress of the fiat type, stiffener type and boss type T profile cylinder head cover gasket were analyzed by using the finite element software. The sealing capability of these types of T profile cylinder head cover gasket was compared. The results show that the sealing capability can be improved by the stiff- eners, but different structure types of stiffeners have different effects on the sealing capability, unreasonable designed stiff- eners will easily cause to the condition of long high sealing stress but the fast failure and aging of T profile cylinder head cover gasket. The fiat type gasket is applicable sealing time but not too high sealing stress; while the stiffener type is applicable to the condition of short sealing time. The boss type has high synthetic performance, which can be applicable to the condition of high sealing stress and long sealing time.