Abstract
The aim of this paper is to investigate the friction characteristics of piston assembly. The frictioa of piston assembly is composed of ring pack and skirt friction. In this paper, the theoretical models of piston ring pack and piston skirt were presented. The mixed lubrication theory was considered to calculate friction force of piston ring and skirt. From the results, most of friction in piston assembly occurred at the piston ring pack. The piston assembly usually showed hydrodynamic lubrication characteristics, but the top and bottom dead centers showed mixed lubrication characteristics. The piston skirt was much affected by radial clearance and load, but ring was significantly influenced by ring tension.
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