Horizontal Pump Lubrication

Flinger,Slinger,thrower same thing.

Oil rings have no relation the the first 3.

They seal between the piston and cylinder wall.

Lyn,

can we differentiate 3 of them based on geometry/working phenomenon?

As Lyn said, the first 3 are the same. Wikipedia refers to the oil ring system as a ring oiler - here's a drawing and more detail: http://en.wikipedia.org/wiki/Ring_oiler. The oil ring is larger than the shaft and rides freely on it, as opposed to being pressed onto the shaft. Its purpose is to lift the oil from the sump up to the bearing.

Oh, ring oiler.

I'm surprised that wasn't in OP's text book.