Category Archives for Hydraulic Pumps

Hydraulic Radial Piston Motors

Radial piston motors produce very high torque at low speed. They are used as wheel motors for large equipment. Pistons operate in radial bores in a stationary cylinder block. The surrounding housing rotates (Fig. 5.18). The rotating housing has two … Continue reading

07. May 2010 by JackSparow
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Hydraulic Bent Axis Motors

Bent axis motors were developed to improve the operating and stall torque efficiencies of high-speed motors. The design (Fig. 5.15) operates in a manner similar to that of the axial piston design. A series of cylinders are mounted around the … Continue reading

07. May 2010 by JackSparow
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Manually Operated Servo Pump

Before beginning our discussion of closed-loop hydrostatic transmissions, it is necessary to first learn how a servo-controlled pump operates. A variable displacement axial piston pump will be used as an illustration. When configured for servo control, this pump will have … Continue reading

05. May 2010 by JackSparow
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Hydraulic Radial Piston Pump

The principle of operation of the radial piston pump is shown in Fig. 4.16. In this case, the cylinders are positioned radially around the axis of rotation. As the shaft rotates, the connecting rods push the pistons back and forth … Continue reading

26. December 2009 by JackSparow
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Hydraulic Axial Piston Pump

The axial piston pump has a series of cylinders (typically 7 or 9) mounted parallel to the axis of rotation. (The arrangement is similar to shell chambers in a revolver.) Pistons are installed in the cylinders. Each piston has a … Continue reading

26. December 2009 by JackSparow
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Hydraulic Vane Pump

A vane pump (Fig. 4.7) has a series of vanes that slide back and forth in slots. There are springs in these slots that push the vanes out until the tip contacts the cam ring. (Some designs port pressurized fluid … Continue reading

25. December 2009 by JackSparow
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Hydraulic Variable Displacement Pump Circuits

Variable displacement pump circuits are called demand flow circuits. A simple example is shown in Fig. 4.6. (The astute reader will quickly observe that this circuit is the first circuit we have studied with no relief valve. Although no relief … Continue reading

25. December 2009 by JackSparow
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Hydraulic Fixed Displacement Pump Circuits

A simple circuit with fixed displacement pump is shown in Fig. 4.3. Circuits with fixed displacement pumps are called constant-flow circuits. The key concept is stated below. Each revolution of a fixed displacement pump delivers a certain volume of fluid … Continue reading

25. December 2009 by JackSparow
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Hydraulic Fixed Displacement Pumps

Vane and piston pumps are available as fixed or variable displacement pumps. If the cam ring is fixed in position (vane pump), or the swashplate is fixed in position (piston pump), the displacement is fixed. Gear pumps, however, are available … Continue reading

25. December 2009 by JackSparow
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Hydraulic Positive Displacement Pump, Gear Pump

The simplest and most robust positive displacement pump, having just two moving parts, is the gear pump. Its parts are non-reciprocating, move at constant speed and experience a uniform force. Internal construction, shown in Figure 2.7, consists of just two … Continue reading

14. December 2009 by JackSparow
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