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参考下表估取，液压泵规格大，取大值，反之取小值，定量泵取大值，变量泵取小值。表 液压泵的总效率液压泵类型 齿轮泵 螺杆泵 叶片泵 柱塞泵总效率 0.6～0.7 0.65～0.80 0.60～0.75 0.80～0.85②在工作循环中，泵的压力和流量有显著变化时，可分别计算出工作循环中各个阶段所需的驱动功率，然后求其平均值，即p=式中：t1，t2，…，tn为一个工作循环中各阶段所需的时间(s)；P1，P2，…，Pn为一个工作循环中各阶段所需的功率(kW)。按上述功率和泵的转速，可以从产品样本中选取标准电动机，再进行验算，使电动机发出最大功率时，其超载量在允许范围内。二、阀类元件的选择1.选择依据选择依据为：额定压力，A10VSO45DFR1/31R-PPA12N00(R902427886),
A10VSO45DR/31R-PPA12N00(R910908725),
A10VSO71DFR1/32R-VPB22U99S2183(R902449039),
A10VSO71DFR1/31R-PPA12N00-S16458 CORE(58CC)(R902427855),
A10VSO71DFR1/32R-VPB22U99(R902449040),
A10VSO71DFR1/32R-VPA12N00(R902427855),
A10VSO71DRS/32R-VPB22U999(R902452429),
A10VSO71DFR1/31R-PPA1200-S1486(R902427947),
A10VSO100DRS/32R-VPB1200-S1439(R902436353),
R910945178 A10VSO18DFR1/31R-PPA12N00 轴向柱塞泵
R910925060 A10VSO28DFR1/31R-PPA12N00 轴向柱塞泵
R902452707 A10VSO45DFR1/32R-VPB12N00 
R902452429 A10VSO58DFR1/32R-VPB22U99－S2183 轴向柱塞泵
R902452431 A10VSO71DFR1/32R-VPB22U99-S2184 轴向柱塞泵
R902436353 A10VSO100DRS/32R-VPB12N00-S1439 轴向柱塞泵
R902449059 A10VSO140DRS/32R-VPB22U99 
R900951305 PGH3-2X/016RE07VU2, 
R900932139 PGH4-2X/020RE11VU2, 
R900932140 PGH4-2X/025RE11VU2, 
R900932141 PGH4-2X/032RE11VU2, 
R900086321 PGH4-2X/040RE11VU2, 
R900932159 PGH4-2X/050RE11VU2, 
R901147115 PGH5-3X/063RE11VU2, 
R901147116 PGH5-3X/080RE11VU2, 
R901147117 PGH5-3X/100RE11VU2, 
R901147118 PGH5-3X/125RE11VU2, 
R901147119 PGH5-3X/160RE11VU2,
90 轴向柱塞泵18ml/r A10VSO18DFR1/31R-PPA12N00
91 轴向柱塞泵28ml/r A10VSO28DFR1/31R-PPA12N00
92 轴向柱塞泵45ml/r A10VSO45DFR1/32R-VPB12N00A10VSO45DFR1/31R-PPA12N00
93 轴向柱塞泵58ml/r A10VSO58DFR1/31R-PPA12N00A10VSO58DFR1/32R-VPB22U99-S2183
94 轴向柱塞泵71ml/r A10VSO71DFR1/31R-PPA12N00A10VSO71DFR1/32R-VPB22U99-S2184
95 轴向柱塞泵100ml/r A10VSO100DFR1/32R-VPB12N00-S1439
96 轴向柱塞泵140ml/r A10VSO140DFR1/32R-VPB12N00A10VSO140DFR1/31R-PPB12N00
A10VSO系列 液压变量柱塞泵 
A10VSO28DFLR/31R-PPA12N00
A10VSO28DFLR/31R-PPA12N00 
A10VSO28DFLR/31R-PPA12N00
A10VSO28DFLR/31R-PPA12N00力士乐Rexroth
A10VSO28DFLR/31R-PPA12N00
A10VSO28DFR/31R-PPA12N00 
A10VSO28DFR1/31R-PPA12K01
A10VSO28DFR1/31R-PPA12N00力士乐Rexroth
A10VSO28DR/31R-PPA12K01
A10VSO28DR/31R-PPA12N00 
A10VSO45DFLR/31R-PPA12N00
A10VSO45DFLR/31R-PPA12N00力士乐Rexroth
A10VSO45DFLR/31R-PPA12N00
A10VSO45DFLR/31R-PPA12N00 
A10VSO45DFLR/31R-PPA12N00
A10VSO45DFR/31R-PPA12K01 力士乐Rexroth
A10VSO45DFR/31R-PPA12K26
A10VSO45DFR/31R-PPA12N00 
A10VSO45DFR1/31R-PPA12K02
A10VSO45DFR1/31R-PPA12N00 力士乐Rexroth
A10VSO45DR/31R-PPA12N00
A10VSO71DFLR/31R-PPA12N00 
A10VSO71DFLR/31R-PPA12N00
A10VSO71DFLR/31R-PPA12N00 力士乐Rexroth
A10VSO71DFLR/31R-PPA12N00
A10VSO71DFLR/31R-PPA12N00 
最大流量，动作方式