What is an external gear pump?
Invented in the early 17th century by Johannes Kepler, usually used for hydraulic power applications, it is a circuit element that converts mechanical energy into hydraulic energy thanks to the drive it receives from the power transmission shaft of the truck, lorry and electric motor, and produces pressure power against the resistance in front of it.
Gear pumps are one of the most common types of positive displacement pumps. The gears in an external gear pump consist of one driving and one idler gear. These gears are mounted parallel to each other. Since the gear teeth are located on the outer surface of each gear, both gears are classified as external gears. There are plain bearings mounted on the pump body and cover part that keep the gears fixed along the centre axis.
In the gear pump, there are parts called body and cover that surround the gears and ensure the transmission of hydraulic oil. The suction and discharge ports in the body ensure the transport of the oil.
How does the external gear pump work?
They work with an unchanging oil volume passing at a constant speed between the teeth of the two gears meshing with each other thanks to the drive from the power transmission shaft of the truck, lorry and electric motor and the gear housing wall called the body. As the gears rotate and the meshing teeth separate, a partial vacuum is created which fills with oil. The narrow clearances and rotational speed minimise internal backward leakage of oil. As the gears continue to rotate, they trap the oil and transport it from the suction point to the discharge point around the wall of the gear housing, called the housing. The robust design of the gears and housings allows for very high pressures and the ability to pump high viscosity oils
Where is the external gear pump used?
It is used in agricultural, industrial and mobile hydraulic applications.
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