Hydraulic pumps are used in hydraulic drive systems and can be hydrostatic or hydrodynamic. A hydraulic pump is a mechanical source of power that converts mechanical power into hydraulic energy (hydrostatic energy i.e. flow, pressure). It generates flow with enough power to overcome pressure induced by the load at the pump outlet. Hydraulic pumps are more frequent in day-to-day life.
Hydraulic pumps are used in hydraulic drive systems and can be hydrostatic or hydrodynamic. A hydraulic pump is a mechanical source of power that converts mechanical power into hydraulic energy (hydrostatic energy i.e. flow, pressure). Hydrodynamic pumps are more frequent in day-to-day life. Hydrostatic pumps of various types all work on the principle of Pascal's law.
Gear pumps (with external teeth) (fixed displacement) are simple and economical pumps.
Hydraulic piston pumps handle very large flows at high hydraulic system pressures. Applications are mobile and construction equipment, marine, offshore and industrial.
Hydraulic vane pumps operate with much lower flow pulsation, i.e. constant flow. As such, vane pumps produce less noise while maintaining a high speed.
| Type | Gear Pumps | Piston Pumps | Vane Pumps |
| Operation Principle | Movement of volumes between tooth spaces and the casing (the external gear pump is shown.) | Expansion and compression of a volume in a cylinder block with the piston stroke | Expansion and compression of volumes between the vanes and the cam ring |
| Efficiency | Generally low. Drops as the gear wears out. | Generally the highest. The valve plate is easily damaged and efficiency drops as the plate wears out. | Generally low. Can be compensated when the vane wears out. |
| Contamination Resistance | Susceptible to foreign substances in oil, but hardly susceptible when the pumps are low pressure types. | Highly susceptible to foreign substances in oil. | Susceptible to foreign substances in oil, but less so than piston pumps. |
| Suction Ability | High. | Low. | Middle. |
| Variable Displacement Type | Difficult | Easy to convert by changing the angle of the swash plate or bent axis. | Can be converted by changing the eccentricity of the cam ring for the unbalanced type. |
| Size and price | Small, light, and inexpensive. | Generally large, heavy, and expensive. | Smallest and relatively inexpensive. |
Forklift Road Machinery Mining Machinery
Agricultural Machinery Engineering Drilling Machinery
Special Vehicle Construction/Hoisting Machinery Excavator/Scraper Machinery