The valve train was instrumented to record the instantaneous roller speed, roller pin friction torque, pushrod forces, and cam speed. Results are presented for one exhaust valve of a motored Cummins L-10 engine. The instantaneous cam/roller friction force was determined from the instantaneous roller speed and the pin friction torque. The pushrod force and displacement were also measured. Friction work loss was determined for both cam and roller interface as well as the upper valve train which includes the valve pushrod, rocker arm, valve guide, and valve. Roller follower slippage on the cam was also determined. A kinematic analysis with the measured data provided the normal force and contact stress at cam/roller interface.(1) Finally, the valve train friction was found to be in the mixed lubrication regime.(2)Further efforts will address the theoretical analysis of valve train friction to predict roller slippage.
Friction Measurement in the Valve Train with a Roller Follower
Sae Technical Papers
International Congress & Exposition ; 1994
01.03.1994
Aufsatz (Konferenz)
Englisch
Friction measurement in the valve train with a roller follower
Kraftfahrwesen | 1994
|Analysis of cam/roller follower friction and slippage in valve train systems
Kraftfahrwesen | 1995
|Analysis of Cam/Roller Follower Friction and Slippage in Valve Train Systems
SAE Technical Papers | 1995
|British Library Conference Proceedings | 2005
|British Library Online Contents | 2006
|