1954 年 20 巻 92 号 p. 269-274
It is one of the most effective methods for rising mechanical efficiency of engine, to reduee the thickness of piston ring thin. But we found the wavy defflection on extremely thin piston rings, which were tentatively applied to some engine. So we calculated elasticaly, to find the lateral stability of thin rings, and obtained the reasons why the wavy defflection was occurred. We are going to continue the test & analysis so that we may set a limit to the thickness of piston rings.