标准摘要
[中文适用范围]： GB/T 20421 的本部分规定了定量或变量容积式旋转液压马达的低速特性的方法。 本方法包括了在低速条件下的试验， 在这种速度下， 可能产生对马达稳定持续的转矩输出有重要影响的液压脉冲频率， 并且会影响到马达所在连接的系统。 测量的准确度分为A、B、C三个等级， 在附录A中给出说明。 [外文原描述]： This part of ISO 4392 describes a method of determining the low speed characteristics of positive displacement rotary fluid power motors, of either fixed or variable displacement types. The method involves testing at slow speeds which may generate frequencies having a significant influence upon the steady continuous torque output of the motor and affect the system to which the motor would be connected.
英文名称Hydraulic fluid power — Determination of characteristics of motors — Part 1: At constant low speed and constant pressure