EFFECT OF ASHLESS FRICTION MODIFIER UNDER BOUNDARY AND MIXED LUBRICATION REGIME

摘要

This work deals with the understanding of the tribological behaviour of ashless friction modifieradditives. These additives in engine contact such as piston rings and cylinder contact are used to reducefriction. Two ashless friction modifiers (FM1 and FM2) containing carbon, oxygen, nitrogen andhydrogen were used with base oil and characterized using a ball-on-flat tribometer. To get as close aspossible to the kinematics of piston rings, the experiments were carried out using reciprocating tribometer[1] under mixed lubrication conditions for various temperatures. The results showed that the addition offriction modifiers to base oil and formulated lubricant has improved the lubricant properties in terms ofboth friction and wear. Sinusoidal speed profile and pressure seem to have an effect on the kinetics offilm formation with FM1. FM2 improves the tribological behaviour with a low friction and little wear.These tests can be used to propose new insights on the action mechanisms of these friction modifiers.