Abstract:
The performance and durability of components in engine valve train is largely governed
by the friction. The valve train is often subjected to severe and transient operating conditions
promoting friction, greatly. The aim of this work is to develop a comprehensive numerical
approach to analyze the friction in roller follower valve train considering the effects of roller
sliding, friction due to asperity interaction and friction arising from other components under
different operating conditions. Simulation results predicted that the friction from asperity
interaction becomes dominant at higher oil supply temperature. High magnitude of sliding
friction was observed due to the rise in roller sliding by increasing the camshaft rotational
frequency and lowering the lubricant oil supply temperature. The numerical approach
developed in this paper is validated by already available experimental data in the form of drive
torque and good conformity between the magnitude of measured and predicted results was
observed.
