Analysis of Friction Characteristic at Piston Ring Assembly using Various Parameters on Single Cylinder S.I. Engine

摘要

The friction force determination of piston ring assembly [PRA] may be among most complicated phenomenon in IC engine and it becomes more severe with increase in cylinder pressure and engine power. The mechanical power losses in any internal combustion engine are observed between 11-18% and share of piston ring assembly friction is about 40-50% of total mechanical friction. Thus, PRA is major contributor in mechanical friction [1]. The knowledge of various tribological parameters is important in order to reduce the frictional losses, emission level and fuel consumption of an internal combustion engine. In PRA friction, the inertia effect and different ring geometry like ring width, ring top surface profile and ring tensions are major responsible factors to decide the development of level of friction in PRA. The present paper has been discussed the effect of tribological parameters such as speed, load, lubricant and operating condition for the capacity of 100CC PRA reciprocation systems. Numerical analysis is presented based on one dimensional Reynolds equation having iso-viscous regime and constant lubricant density. Top ring liner contact profile coupled with piston assembly motion, hydrodynamic pressure field generation and lubricating film thickness profile as function of crank rotation are examined. Furthermore scientific methodology - Finite elements method has been used for predicting various stresses developed on top piston ring analyzed under different working conditions, material property and ring tensions. The obtained result gives good agreement with the published work.