Abstract
Engine gasket is the thin steel plate with coatings. Its compressive deformation affects the height of engine assembly, which changes combustion chamber’s volume and then influences engine performance. In this paper, the assembly simulation of head, block and gasket was studied. Then a further simulation takes the thin coatings on steel sheet into consideration. In the second simulation, gasket’s partial micro-model in micron-scale meshes was established and deformation of coatings was analysed. The combination of deformations explores the cause of fluctuations of gasket’s tightened thickness and obtains more precise numerical results of tightened thickness at different positions. Moreover, a lead pellet test was carried out to verify the results of tightened thickness calculation.
Highlights
As the modern automobile engines keep on pursuing higher power, economy and emission performance, the requirements of manufacture precision and reliability for each part are increasing
Deformation of gasket compressed by cylinder head and block was divided into two steps
The microscopic simulation of a tiny piece model near the edge of cylinder is carried out which focuses on the pure compression of the sheet and soft coatings
Summary
As the modern automobile engines keep on pursuing higher power, economy and emission performance, the requirements of manufacture precision and reliability for each part are increasing. The cylinder gasket is the most important component in sealing system which directly affects the performance. There are already some researches on the relationship between mechanical structures of gasket and its sealing ability which are the focus of engine sealing study. Hettich et al studied the characteristic of gasket under dynamic shear stress, and established corresponding constitutive relations [1]. And Kämpkes studied the overall performance of the connection in consideration of asbestos rubber gasket sealing performance, and discussed the effect of the gasket’s microstructure to leakage characteristics [2]. Since 1990, nonlinear finite element simulation started to be used to research the stress distribution and deformation of the gaskets
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