Abstract
In reciprocating internal combustion engines, one of the most important issues is to clarify the frictional characteristics between the piston ring and the cylinder liner because of the demand for reduction in frictional loss as well as the solution to problems such as scuffing and wear with the advances in engine performance achieved in recent years. In the present study, the floating liner method in which the cylinder liner is supported by means of hydrostatic bearings was developed to measure accurately the frictional force of the piston assembly as a function of the crank angle during firing operation. The influences of engine operating conditions (engine speed, cylinder wall temperature, gas pressure in the cylinder), lubricating oil viscosity, polymer-containing multigrade oil and friction modifier on the frictional characteristics were evaluated on the basis of the experimental results obtained with this equipment.
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