标准摘要
[中文适用范围]： 本国际标准规定了润滑油（以下称为“四冲程发动机油”）的要求，该发动机用于四冲程循环火花点火汽油发动机，该发动机使用一个公共油底壳，其中包含摩托车、小型摩托车、全地形车（ATV）和相关设备的发动机和相关传动系统（变速器、离合器、起动装置）的润滑油。四冲程发动机油的分类定义在 ISO 6743-15 [1] 中。在 ISO 6743-15 涵盖的所有类别中，本国际标准包括 EMA 和 EMB 类别。本国际标准根据物理和化学特性规定了四冲程循环汽油发动机油的性能分类，以及三个摩擦性能指数，这些指数是根据 JASO T904 测试程序1）从润滑剂的摩擦特性得出的。注：在本国际标准中，术语“%（m/m）”用于表示质量分数。 [外文原描述]： ISO 24254:2007 specifies the requirements of lubricating engine oils (hereinafter referred to as “four-stroke engine oils”) to be used in four-stroke cycle spark ignition gasoline engines employing a common sump containing the lubricating oil for both the engine and associated drivetrain (transmission, clutch, starter) of motorcycles, motor scooters, all-terrain vehicles (ATVs) and related equipment. Classification of four-stroke engine oils is defined in ISO 6743-15. The performance requirements of four-stroke engine oils classified in all of the categories covered by ISO 6743-15, EMA and EMB, are embraced in this specification. ISO 24254:2007 specifies the performance classification of four-stroke cycle gasoline engine oils, based on physical and chemical properties, and three friction performance indices, which are derived from the frictional properties of the lubricant, according to the JASO T904 test procedure.
英文名称Lubricants, industrial oils and related products (class L) — Family E (internal combustion engine oils) — Specifications for oils for use in four-stroke cycle motorcycle gasoline engines and associated drivetrains (categories EMA and EMB)