液压马达是液压系统的一种执行元件，它将液压泵提供的液体压力能转变为其输出轴的机械能(转矩和转速)。液体是传递力和运动的介质。液压马达，亦称为油马达，主要应用于注塑机械、船舶、起扬机、工程机械、建筑机械、煤矿机械、矿山机械、冶金机械、船舶机械、石油化工、港口机械等。
折叠低速马达
转速低于500r/min的液压马达属于低速液压马达。它的基本形式是径向柱塞式。低速液压马达的主要特点是:排量大，体积大，转速低，可以直接与工作机构连接，不需要减速装置，使传动机构大大简化，低速液压马达的输出扭矩较大，可达几千到几万Nm，因此又称为低速大扭矩液压马达。

轴向柱塞泵除阀式配流外，其它形式原则上都可以作为液压马达用，即轴向柱塞泵和轴向柱塞马达是可逆的。轴向柱塞马达的工作原理为，配油盘和斜盘固定不动，马达轴与缸体相连接一起旋转。当压力油经配油盘的窗口进入缸体的柱塞孔时，柱塞在压力油作用下外伸，紧贴斜盘，斜盘对柱塞产生一个法向反力p，此力可分解为轴向分力及和垂直分力Q。Q与柱塞上液压力相平衡，而Q则使柱塞对缸体中心产生一个转矩，带动马达轴逆时针方向旋转。轴向柱塞马达产生的瞬时总转矩是脉动的。若改变马达压力油输入方向，则马达轴按顺时针方向旋转。斜盘倾角a的改变、即排量的变化，不仅影响马达的转矩，而且影响它的转速和转向。斜盘倾角越大，产生转矩越大，转速越低。轴向柱塞泵 E-A4VSO250EO2/30R-VPB25N00-SO3
轴向柱塞泵 E-A4VSO250EO2/30R-VPB25N00-SO3 
柱塞泵 A4VSO180DR/30R-FPB13N00
恒压变量泵 E-A4VS0125DR/22R-VPB13N00 
柱塞泵 A4VSO180DR/30R-FPB13N00 
柱塞泵 A4VS0180LR2G/30R-PPB13NOO
柱塞泵 A4VSO250LR2D/30R-PPB13NOO 
柱塞泵 A4VSO250DR/30R-PPB13NOO
泵 A4VG56EZ2DM1/32-NSC02F003F
柱塞泵 A4VS0250DR/30RPPB13N00
阀柱塞泵 A4VTG71HW/32R-NLD10F001S
柱塞泵 A4VSG750HD/22R-PPH10NOO 
轴向柱塞泵 A4VS07IDR/3XR 
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柱塞泵 A4VG90EP2DT1/32R-NAF02F00
柱塞泵 A4VSO-250E02/30R-PPB13N00 
柱塞泵 A4VSO-250DR/30R-PPB13N00
液压马达 A4VG40EP4DMT1/32L-NSC02F015PH 
柱塞泵 A4VG71DWDMT2/23L-NZF02F041D 
泵 A4VG250HD1D1/32LNZD10F001S 
柱塞泵 A4VS0125DR30R-PPB13N00 
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柱塞泵 A4VG125HD1D2/32R-NSF02F02F021P
串泵 A4VG125HDMT1-32R-NSF02F691S-
柱塞泵（二串泵） A4VG125EP2/32+A10V028DR/31 
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AHA4VS0250LR3G/30R-PZB13N00-S0
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AHA4VS0250HD1GB/30R-PZB13K35-S
AHA4VS0250LR3G/30R-PZB13K35-S0
AHA4VS0250LR3G/30R-PZB13N00-S0
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A4VG125HDDT1/32L-PZF02F001D
A4V125HW10R0C101A-K

折叠高速马达
额定转速高于500r/min的马达属于高速马达。高速马达的基本形式有齿轮式、叶片式和轴向柱塞式。它们主要特点是转速高，转动惯量小，便于启动、制动、调速和换向。

轴向柱塞泵除阀式配流外，其它形式原则上都可以作为液压马达用，即轴向柱塞泵和轴向柱塞马达是可逆的。轴向柱塞马达的工作原理为，配油盘和斜盘固定不动，马达轴与缸体相连接一起旋转。当压力油经配油盘的窗口进入缸体的柱塞孔时，柱塞在压力油作用下外伸，紧贴斜盘，斜盘对柱塞产生一个法向反力p，此力可分解为轴向分力及和垂直分力Q。Q与柱塞上液压力相平衡，而Q则使柱塞对缸体中心产生一个转矩，带动马达轴逆时针方向旋转。轴向柱塞马达产生的瞬时总转矩是脉动的。若改变马达压力油输入方向，则马达轴按顺时针方向旋转。斜盘倾角a的改变、即排量的变化，不仅影响马达的转矩，而且影响它的转速和转向。斜盘倾角越大，产生转矩越大，转速越低。
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