船 用 柴 油 机 供 油 机 构 滚 轮 衬 套 混 合热 弹 流 润 滑 特 性 研 究

Taking the roller floating bushing roller pin in the oil supply mechanism of marine diesel engine as the research object，considering the elastic deformation of the bushing under low speed and heavy load operation conditions，and taking into account the surface roughness characteristics，an analytical model of the double layer oil film mix thermoelastic hydrodynamic lubrication of the floating bushing was constructed. The effects of the inner and outer oil film clearance ratio，the bushing width diameter ratio，the bushing thickness and its surface roughness on the lubricating properties including the ring speed ratio，the maximum oil film pressure of the inner and outer layers，and the bearing capacity and so on were investigated. The results show that the oil film thickness of the inner layer of the roller floating bushing roller pin structure is small and the lubrication state is poor during the operation process. Under low speed and heavy load conditions，the elastic deformation and mixed lubrication effect of bushing can not be ignored. The larger the width diameter ratio，the smaller the inner and outer layer gap ratio，the smaller the maximum oil film pressure，the stronger the bearing capacity of the structure，but the higher the temperature rise. The mixed lubrication state only appears in the lubricating oil film of the inner layer of the bushing. And the greater the surface roughness of the bushing，the worse the lubrication effect.