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To compare the friction power loss between the crankpin bearing (CPB) and crankshaft bearing (CSB) on improving the engine power, a slider-crank-mechanism dynamic model is established to compute the dynamic loads, Wp and Ws, impacting on the CPB and CSB. Based on the impact of Wp and Ws, a hydrodynamic lubrication model of the CPB and CSB is built to calculate the friction forces, Fp,s, and coefficient of frictions, μp,s, generated on the CPB and CSB. The simulation results of the Fp,s and μp,s on improving the engine power are then compared and analyzed, respectively. Under the same operation condition, the research results show that the friction power loss of the CPB is larger than that of the CSB under both the low and high engine speeds. Besides, the friction power loss of the CPB at 6000 rpm is also higher than that of 2000 rpm of the engine speed. Consequently, the friction power loss of the engine is greatly influenced by the crankpin bearing and at a high engine speed of 6000 rpm.

Comparison of friction power loss between crankpin and crankshaft bearings on improving the engine power