Journal of Theoretical
and Applied Mechanics

57, 1, pp. 273-286, Warsaw 2019
DOI: 10.15632/jtam-pl.57.1.273

Analysis of dynamics and friction resistance in the cam-tappet system

Krzysztof Siczek, Andrzej Stefański
In this paper, the influence of friction resistance and mutual contact interaction on dynamical
properties of the cam-tappet mechanism is analyzed. A dynamical model of the
cam-tappet contact has been developed. Chosen results of numerical simulations of this
model are presented for cases with and without oil lubrication in contact zones. Various
phenomena accompanying the cam-tappet contact dynamics have been observed, e.g., change
of the global direction of tappet rotation, local oscillation of these revolutions, changes of
friction in function of frequency of the camshaft longitudinal vibrations. We confirm, that
the growing amplitude of camshaft longitudinal vibration causes an increase in the tappet
rotational speed, whereas its reducing to small values leads to stopping the tappet rotation.
Keywords: cam-tappet mechanism, friction, lubrication


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