a "positive displacement" pump, unlike a centrifugal pump
A small pump consisting of a pair of gear-wheels in mesh, enclosed in a casing, the fluid being carried round from the suction to delivery side in the tooth spaces; used for lubrication systems, etc.
Special type of rotary pump. Uses step-down gearbox for pumping very viscous liquids.
Gear Pumps are used for some engine oil pumps and hydraulic pumps. The concept involves generating oil flow by two gears meshing together in a relatively tight enclosure. The size of the gears and the tightness of the enclosure will determine what the pump is capable of generating.
A Gear pump uses the meshing of gears to pump fluid by displacement. They are one of the most common types of pumps for hydraulic fluid power applications. 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.