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利用销盘式往复滑动试验机和实际柴油机,以浮动气缸套法评价了在用油对活塞环摩擦的影响。得出的主要结论是:(1)含有高浓度碳烟的在用油由于油膜扩展性差,减少供油量,润滑性能则显著下降;(2)即使在用油的运动粘度因碳烟絮凝而增加,但在滑动表面上由于反絮凝作用其有效粘度近似等于新油。在用油的平均摩擦压力与新油井无差异;(3)由于缺油润滑在活塞环组中居支配地位,在用油使膨胀行程初期的润滑严酷性加剧,从而引起边界摩擦增加。
Using the pin-plate reciprocating sliding test machine and the actual diesel engine, the influence of the oil on the piston ring friction was evaluated by the floating cylinder liner method. The main conclusions drawn are as follows: (1) In-service oil containing high-concentration soot has a significant decrease in lubrication performance due to poor film spreading and reduced oil supply; (2) Even when the kinematic viscosity of oil is flocculated by soot Increase, but its effective viscosity on the sliding surface due to deflocculation is approximately equal to the new oil. There is no difference between the average friction pressure of the oil and the new oil well. (3) Due to the lack of lubrication in the piston ring group dominates, oil lubrication aggravates the lubrication at the beginning of the expansion stroke and thus increases the boundary friction.