Name : The 10th International Conference on Modeling and Diagnostics for Advanced Engine Systems (COMODIA 2022)
Date : July 05, 2022 - July 08, 2022
The cam-roller pair is the core friction pair of the diesel engine fuel supply mechanism. Affected by complex transient conditions and interface micro morphology, it usually works in the mixed lubrication state of lubrication-contact coexistence. Under harsh working conditions, the interface roughness peak of cam-roller contacts, resulting in stress concentration and dry contact wear. In this paper, considering the influence of real surface roughness and transient working conditions, the 3D mixed lubrication characteristics of cam-roller pair are studied. Results show that the lubrication state at the fuel supply end angle is the worst in the working cycle, and the existence of surface roughness leads to drastic changes in the film state, when Rq exceeds 0.6um, the lubrication failure is easy to occur. The lubrication state of shaved surface is poor, and polished surface can significantly improve the lubrication performance of cam-roller pair. Under low-speed and heavy-load conditions, the film thickness is reduced clearly, which will may lead to excessive wear; By optimizing the structural parameters such as the eccentricity and base circle radius, the film lubrication contact state is significantly improved.
