九十八、液压传动系统常见的基本回路有哪几种?各种机械的驱动工作部件,主要的任务有三个方面1.克服工作时的阻力(或力矩);2.根据工作需要改变工作速度;3.为实现工作所需循环变换运动的方向。作为驱动工作的液压系统就要满足这些要求,液压系统就是由实现以上要求的基本回路所组成。基本回路的分类尚无统一规定,按回路的作用分, Ninety-eight, hydraulic transmission system common basic circuit there are several? A variety of mechanical drive components, the main tasks are three aspects 1 to overcome the resistance (or moment); 2 according to work needs to change the working speed ; 3 in order to achieve the work required by the cycle of transformation movement direction. As a driving hydraulic system to meet these requirements, the hydraulic system is composed of the basic circuit to achieve the above requirements. There is no uniform classification of the basic circuit, according to the role of the circuit points,