Author(s)

V. Lazarev, K. Gavrilov, A. Doikin, G. Vorlaufer & J. Sequard-Base

Abstract

To decrease mechanical losses in internal combustion engines (ICE) a deeper understanding of the friction and wear processes in the main tribosystems is necessary. In particular, the interrelation between frictional energy and wear has to be analyzed. For this reason the hard to measure quantity of coefficient of accumulation of frictional energy, which is a pivotal parameter in some energy based wear theories, is determined in this work using model tribometer experiments. The experiments are performed using small specimens made of aluminium silicon alloy and gray cast iron with a SRV tribometer (linear reciprocating motion) where loading and lubrication conditions which closely simulate the real contact situation of a piston skirt sliding against a cylinder liner near the top dead center are applied. To calculate the coefficient of accumulation of frictional energy, experimentally gained values for the linear integral intensity of wear are analyzed numerically for various loading parameters (normal load, sliding speed, conditions of lubrication) which result in variation of the coefficient of friction and in the amount of wear. Finally the results of the correlation between the coefficient of accumulated energy in the piston skirt–cylinder liner tribosystem and the loading conditions Energy Production and Management in the 21st Century, Vol. 1 625 www.witpress.com, ISSN 1743-3541 (on-line) WIT Transactions on Ecology and The Environment, Vol 190, © 2014 WIT Press doi:10.2495/EQ140601 are presented. Furthermore some recommendations for technical solutions to decrease mechanical losses in the investigated system are given. Keywords: tribosystem, contact interface, friction energy, mechanical losses.

Keywords

tribosystem, contact interface, friction energy, mechanical losses.