Hydraulic Pumps

hydraulic pumps
Aisoar hydraulic pumps

Hydraulic Pumps

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.

ROD:
TUBE:
GLAND:
PISTON:
END MOUNTS:
PORTS:
SEALS:
PAINT:
ROD ENDS:

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

Types of hydraulic pump

Gear Pumps

Gear pumps (with external teeth) (fixed displacement) are simple and economical pumps.

Structure

Piston Pumps

Hydraulic piston pumps handle very large flows at high hydraulic system pressures. Applications are mobile and construction equipment, marine, offshore and industrial.

Structure


Vane Pumps

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.

Structure

Characteristics of the Pumps

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.

Application


                   Forklift                                  Road Machinery                          Mining Machinery


                   Agricultural Machinery                                                Engineering Drilling Machinery


                Special Vehicle           Construction/Hoisting Machinery      Excavator/Scraper Machinery

 

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