How a Hydraulic Pump Works

Articles - Education

In a gear pump, oil is taken from the entrance to the outlet in the space between two teeth in each gear. One gear is driven by the input source of the system and this in turn moves the other gear.

The two are in a Glossary Link chamber formed by a "ring" part of the Glossary Link pump housing and two side plates, called Glossary Link pressure plates. 

The set of gears can be external, internal or screw type. 


EXTERNAL GEAR PUMP

An external gear pump has its teeth in the outer circumference of the base. There are three types of gear used, spur, helical and herringbone. The spur gears are the most popular and easy to manufacture. However, it is the type that produces more noise. Can work under high pressure (3,000 to 4,000 psi).

The helical gear pump is designed primarily to reduce the noise level but has a very big problem, generates an axial load that causes the need for robust bearings and for this reason these pumps can only go up to 2,000 psi. 

The herringbone type gear pump is very quiet, no axial load but can only work up to 500 psi and is very expensive. 


INTERNAL GEAR PUMPS 

another type of pump is the internal gear or gerotor type. It consists of an external gear meshing with another inmate. The outside has one tooth more than the internal space and generating that extra tooth determines the Glossary Link displacement of the pump.

 


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