ピストンリング列の潤滑解析 : 油不足が油膜厚さに及ぼす影響 (<小特集>エンジンシステムの新展開)

概要

論文の詳細を見る
Theoretical analysis of mixed lubrication has been carried out for a piston ring package of an automotive reciprocating engine as a method to elucidate better specifications of rings for reducing friction loss. The starved inlet boundary condition has been employed for oil film of each ring based upon experimental results obtained through scanning laser-induced-fluorescence oil film thickness measurement. By considering starvation, predicted oil film thickness at compression rings was in better agreement with that measured than the former prediction under the fully flooded inlet condition. Film thickness at the 1st compression ring under the full load firing condition was predicted to be smaller than that in motoring, which also agreed with experimental results, due to the different inlet conditions assumed for oil film at the 2nd compression and upper rail of the oil ring under different operating conditions. Predicted oil film thickness was much smaller than that measured at both rails of the oil ring, which seems to be caused mainly by insufficient ability of the spatial analysis of the LIF measurement. Effects of the change of the oil ring surface profile due to tilting during sliding, of viscosity variation and of cylinder bore distortion, were not negligible, but were not considered in the analysis.
社団法人日本機械学会の論文
1995-10-25