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Valve-train dynamics: a simplified tribo-elasto-multi-body analysis

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journal contribution
posted on 2009-06-05, 13:03 authored by M. Kushwaha, Homer Rahnejat, Z.M. Jin
This paper presents a model of a cycloidal cam-flat follower pair. The model incorporates the inertial elements, the assembly constraint functions and the sources of compliance in the valve train. The sources of compliance include the valve spring characteristics, including the spring surge effect under dynamic conditions, as well as the contact compliance between the cam and the flat follower. The contact domain is treated as a counterformal concentrated lubricated region subjected to an elasto-hydrodynamic regime of lubrication (EHL). The prevailing contact geometry is one of finite line contact. The paper presents the results of simultaneous solution of the Lagrangian dynamics for the non-linear constrained system, together with an approximate quasi-static elastohydrodynamic solution of the lubricated contact conjunction at each time step by an extrapolated oil-film thickness formula for combined entraining and squeeze film action. The effect of spring surge on the contact separation and residual vibrations of the system are investigated, as well as the lubricant pressure distribution and film thickness, including during start-up and acceleration.



  • Mechanical, Electrical and Manufacturing Engineering


KUSHWAHA, M., RAHNEJAT, H. and JIN, Z.M., 2000. Valve-train dynamics: a simplified tribo-elasto-multi-body analysis. Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics, 214 (2), pp. 95-110


Professional Engineering Publishing / © IMECHE


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This article was published in the Journal, Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics [© IMECHE]. The definitive version is available at: http://www.pepublishing.com/




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