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. Gear pumps are also widely used in chemical installations to pump fluid with a certain viscosity.
A small pump consisting of a casing enclosing a driven gear wheel in mesh with a second gear wheel, the fluid being carried from the suction to the delivery side of the pump in the spaces between the teeth.
A group of people gathered together in one place for a common purpose
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a group of machine parts that fit together to form a self-contained unit
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The Gear of Rust
After looking over the bottom step, my brother and I proceeded to the next floor. Only 4 or 5 steps remained toward the top of the small stair case, so a little creativity had to be put in place to get up there, carefully of course. Upon getting to the top, this gear and pump assembly was there, just asking to be shot. The room was rather dark, with little light going through. I believe my longest exposure out of the 5 was around 51 seconds, thanks to the use of a remote trigger.
Nikon D90, 18mm, f/11, 5 exposures
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This is looking inside, past to the gears mounted in the bottom of the pump. You can see the commutator assembly in the foreground