第一节 概述 1、适用范围 本标准规定了用于二冲程和四冲程压燃往复式内燃机、直径为50毫米至200毫米和70毫米至200毫米的各种片状撑簧油环、螺旋簧油环的结构、尺寸、材料和标志。符合本标准第二部分要求的组合环,其环槽的设计应符合本标准第五部分的规定。 （注;本标准规定的尺寸适用于水冷和空冷发动机。） Section 1 Overview 1, Scope This standard specifies for two-stroke and four-stroke compression ignition reciprocating internal combustion engine, a diameter of 50 mm to 200 mm and 70 mm to 200 mm of various sheet-like spring oil ring, coil spring The structure, size, material and logo of the oil ring. In accordance with the requirements of the second part of this standard combination ring, the ring groove design should be consistent with the provisions of Part V of this standard. (Note: The dimensions specified in this standard apply to water-cooled and air-cooled engines.)