Lubrication Analysis of Small-End Bearings of Reciprocating Engines Based on Orthogonal Experiment

Small end bearings are a critical component of reciprocating engines, and the performance their lubrication directly affects engines’ reliability mechanical efficiency. There many factors that influence lubrication. A new type small-end bearing test rig was developed to reveal key influencing on characteristics, multi-body dynamic model coupled with elastohydrodynamic (EHD) characteristics built. The verified through experiments. In accordance orthogonal experimental requirements, impact various analyzed, results showed that: (1) minimal oil film thickness (MOFT), friction power, maximum pressure (MOFP) major evaluation indicators lubrication, most significant pin bushings’ clearance, engine speed, bushing surface roughness; (2) increasing clearance bushings can increase hydrodynamic percentage average film, but it also reduces local minimum film; (3) an in roughness improve MOFT enhance its carrying capacity, may power; (4) high speeds between piston status, increases power asperity contact region, reducing research be used for design connecting rod efficiency reliability.