Gear pump

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An exploded view of an external gear pump.
Water flows from left to right in this Gerotor pump
Oil pump from a scooter engine

A gear pumps which is used as a meshing gears, to pump the fluid by displacement.[1] They are one of the most common types of pumps for hydraulic fluid power applications. The Gear pumps are also widely used in chemical installations to pump fluid with a certain viscosity.There are two main variations; external gear pumps which use two external spur gears, and internal gear pumps which use an external and an internal spur gear. Gear pumps are positive displacement (or fixed displacement), meaning they pump a constant amount of fluid for each revolution. Some gear pumps are designed to function as either a motor or a pump.


Theory of operation


Suction and pressure ports need to interface where the gears mesh (shown as dim gray lines in the internal pump images). Some internal gear pumps have an additional, crescent shaped seal (shown above, right).

Pump formulas:

Generally used in:

See also


External links