Gear Pump, 2-Lobe (from Internet Glossary of Pumps)
Gear Pump, 2-Lobe
This type of gear pump has two lobes on each shaft. The lobes nearly touch each other in the center forming a fairly tight seal.

They also nearly touch the casing and when they revolve they carry fluid around the outer edge to the outlet, at the top in this drawing.

This type of gear pump, or a three-lobe version, is often used as a supercharger for diesel engines, forcing air (not liquid) into the power cylinder.

(This is a still representation and possibly also a low-resolution image of a pump which is fully animated in the CD-ROM version of this glossary.)

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Last modified February, 2002
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