Archive for December, 2009

Hydraulic Gerotor Pump Efficiency

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Hydraulic Gerotor Pump Efficiency

Overall efficiency accounts for the loss of mechanical energy due to friction, and the loss of hydraulic energy due to the leakage flow. The clearances between moving parts can be thought of as an orifice. Fluid on one side of the orifice has a high pressure (up to the maximum pressure that exists at the …

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Hydraulic Radial Piston Pump

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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 in the cylinders to develop the pumping action. The design is used to pump both …

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Hydraulic Axial Piston Pump

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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 spherical end that mounts in a shoe (Fig. 4.12). The shoe is held against a …

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