Abstract
This study was aimed at clarifying the characteristics of oil film thickness, piston friction and oil consumption in the two-ring piston. Through experimental studies it was found that the oil film thickness of the two-ring piston is thinner than that of the three-ring piston due to the greater amount of blowby through the piston. As a result, increase of oil consumption of the two ring piston was kept to the low level of the conventional three ring piston. A quantitative analysis on the friction force and the relationship between the oil consumption and oil ring movement were carried out using the unique measuring device developed by the authors.
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