Hydraulic Gear Pump



Gear pumps



Gear pump is a fixed positive displacement pumps, and can be divided into external and internal gear types.


External Gear Pumps
A gear pump produces flow by carrying fluid in between the teeth of two meshing gears. One gear is driven by the drive shaft and turns the idler gear. The chambers formed between adjacent gear teeth are enclosed by the pump housing and side plates.
A partial vacuum is created at the pump inlet as the gear teeth unmeshed.
Fluid flows in to fill the space and is carried around the outside of the gears. As the teeth mesh again at the outlet end, the fluid is forced out.
Under the optimum condition the volumetric efficiencies of gear pumps run as high as 93%.



Internal Gear Pumps
Internal gear pumps have an internal gear and an external gear. Because these pumps have one or two less teeth in the inner gear than the outer, relative speeds of the inner and outer gears in these designs are low. For example, if the number of teeth in the inner and outer gears were 10 and 11 respectively, the inner gear would turn 11 revolutions, while the outer would turn 10. This low relative speed means a low wear rate. These pumps are small, compact units.

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