Transient lubrication of floating bush coupled with dynamics and kinematics of cam-roller in fuel supply mechanism of diesel engine.

This article focuses on the development and validation of a transient thermoelastic hydrodynamic lubrication model for the double-layer oil film in the roller-floating bush pin (RFBP) structure, a key component in the fuel supply mechanism of marine diesel engines. The model integrates cam-roller dynamic and kinematic analyses to capture time-varying operating conditions, including elastic deformation and thermal effects, and is experimentally verified using a custom test platform simulating actual engine conditions. Results indicate that the inner oil film exhibits poorer lubrication performance and higher pressure than the outer film, with lubrication characteristics significantly influenced by cam speed, plunger fuel pressure, length-diameter ratios, and clearance ratios. The study highlights the importance of considering transient operating conditions and structural parameters for optimizing the RFBP design to enhance reliability and performance in diesel engine fuel supply systems.