重庆服装设计学校:液压中常用的计算公式（液压缸，液压泵，马达）

 液压技术中的常用计算公式
    项 目   公 式                                                                                                                                   备 注
    液压缸面积(cm2)        A=πD2/4                                                                                         D: 液压缸有效活塞直径(cm)
    液压缸速度(cm/min)与流量(L/min)的关系     V=103Q/A                                              Q:流量(L/min)
                                                                                                                                                 A:液压缸活塞有效作用面积(cm2)
    液压缸无杆腔差动速度V1与非差动速度V0的关系 V1=V0A1/(A1-A2)                      A1:液压缸无杆腔有效作用面积(cm2)
                                                                                                                                                A2:液压缸有杆腔有效作用面积(cm2)
   
    液压缸输出推力(kgf)     F=(P1×A1)-(P2×A2)                                                                  P1:A1腔压力(kgf/cm2)　　P2:A2腔压力(kgf/cm2)　　                                                                                                                                                A1,A2:液压缸进油和回油腔的有效作用面积(cm2 )
    泵或马达流量(L/min)      Q= q×n/1000                                                                              q:泵或马达的几何排量(mL/r)                     n:转速(rpm)
    通过节流口的流量Q(L/min)        Q=8a(10△P) 1/2                                                           a:节流口通流面积(cm2)
                                                                                                                                                △P:节流口前后的压差(MPa)
    液压马达排量(m3/r)与最大输出转矩(Nm)的关系 q=2ЛM/△Pη                                   M:马达最大输出转矩(Nm) △P:马达进出口压力差(Pa) η:马达机械效率
    液压泵所需电机功率(kw) P=Q×p/61.2                                                                            Q:流量(L/min) p:压力(Mpa)
    管内流速(m/s) V=21.22Q/ D2                                                                                            Q:流量(L/min) D:管内径(mm)
    液压泵实际输出流量Q1(L/min)
    与电机运行电流I1(A)的关系 P:电机实际输出功率(kw) Pe: 电机额定功率(kw) I1:电机运行电流(A) Ie:电机额定电流(A) Io:电机空载电流(A) η:液压泵总效率