Lubrication and Slippage in Roller Finger Follower Systems in Engine Valve Trains

Abstract

To predict the performance of the energy-efficient finger follower system with a roller follower requires an adequate understanding of the kinematics and forces in the roller cam contact. This paper analyzes the kinematics, lubricant film thickness and normal/friction tractions in the finger follower and the roller itself The analysis includes the EHD tractions, hydrodynamic rolling friction and bearing torque to determine the cam-roller slippage and tractions for various positions of a cam cycle. For a roller finger follower and a sliding finger follower of similar design, a comparison is given for the calculated EHD film thickness and power losses in various parts of the tappet.

Presented at the 45th Annual Meeting in Denver, Colorado May 7–10, 1990

Notes

Presented at the 45th Annual Meeting in Denver, Colorado May 7–10, 1990