Abstract
The variation of oil film thickness on a piston ring of diesel engine is analyzed by using thermo-hydrodynamic lubrication. The oil film temperature is calculated by using unsteady state 2-D energy equation considering the viscous dissipation. The effects of oil film temperature and viscosity on oil film thickness are discussed and the calculated thickness is compared with the measured one. As a result, the calculated values agree approximately with the measured values. The minimum oil film thickness calculated by the present method is thinner than that with viscosity estimated by liner temperatures.
