Friction phenomenon study for chain link – guide contact in translational oscillatory motions

Abstract

Abstract The fuel consumptions of the automobiles are hardly influenced by the friction between the components of their mechanical transmissions being in relative motion. One of the main parts of the automobiles mechanical transmissions is represented by the chain drive transmission. The frictions inside the chain drive transmissions could be split in: the friction inside the chain, between its components (links, bolts); the friction between the chain links and the sprockets; the friction between the chain links and the active part of the tensioning guide. The aim of the paper is to investigate the friction phenomenon in the chain link – guide contact for a set of normal forces, velocities and temperatures. The tests are achieved for sets of motions frequencies, normal loads and oil bath temperatures; according to these, there are determined the dynamic friction coefficients (during the motions) and the static friction coefficients (at the end parts of the strokes). The results show graphically the variations of the static and dynamic friction coefficients with the motions frequencies, the normal loading forces and the oil bath temperatures. The conclusions are useful in order to identify the functioning cases where the frictional loses are small.