“ About five years ago. I was going down this very road. Same time of day, going about the same speed Im going now...there was a rock in the road. Couldnיt have been more than a pebble. Never really saw it! Lost control of the bike, went flyinי about a hundred feet - came down right on my head. Cracked it wide open! Blood and stuff was just splattered all over the road, there...I broke every bone in my face. Hey, you know, when they found me, my eyes were hanging out of their sockets? Yeah, they pronounced me dead at the scene. I was in a coma for...well, they told me about a year...said Id be a vegetable for life. Yeah, but I showed יem. Ever since then I always wear a helmet!”
Seinfeld, The Keys
Episode no. 40

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Eccentric oil pump

The idea behind this pump is different pressure zones (caused by constant volume changes) .
In this pump there are only 2 moving parts, the orange rotor in the middle, which spins by the engine power, moves the passive outer yellow rotor.
The active rotor is driven either by a little metal chain like in some scooters, or sprockets in motorcycles and cars.
The CONSTANT VOLUME CHANGES create different pressure zones in certain areas of the pump.
At the left you can see the empty space (which is shown as stripes) always expanding – exactly there, you will find the oil entrance to the pump.
On the right side you will see the space is constantly getting smaller – there is the oil exit pipe located.

The oil is pumped in on the left, it is then carried in the space between the two rotors, and then finally being squeezed out on the right side exit.

This pump is very popular in motorcycles, scooters and even cars. This pump has 4/5 rotors. There are other pumps with 8/9 rotors and even more.

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