Abstract
The paper investigates the tribological contact conditions between a polynomial automotive cam and a flat follower. A multi-body model of the system is presented to take into account the complex tappet motions. A set of such models is presented in order to predict the cam-tappet friction force, the tappet-tappet bore friction force and the resulting tappet spin. The tribological conditions giving rise to these kinetic actions include the elastohydrodynamic regime of lubrication in the concentrated cam-follower contact and a mix of hydrodynamic and boundary friction action in the tappet-tappet bore contact. While boundary friction dominates the tappet-tappet bore friction at low engine speeds, for high engine speeds the boundary friction dominates the closing event of the cam, and hydrodynamic and mixed lubrication dominate the opening event of the cam. The simplified friction models are experimentally validated on a single-cylinder diesel engine. The measuring techniques are based on a redesigned engine tappet equipped with four strain gauge bridges.
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Schedule a callMore From: Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics
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