It's really no different than most other types of pumps. Basically the tolerance between the inner shaft and the tube it rotates in acts as a check valve, much like the tolerance between the gears and the sides of the housing do in a gear pump. From there, when the flat on the shaft passes the inlet port, head pressure from the oil tank forces oil into the cavity formed by the flat. As the shaft rotates the oil is carried around to the outlet port. In a pump like this the oil being moved isn't really being pressurized so much as is simply being conveyed from the tank to the outside. In any case, given the way liquids flow, when it reaches the outlet port, it is going to have a tendency to flow from it's container to the point of lowest resistance, which will be out the oiler tube and to the bar.
It's really a very simple setup when you get right down to it, but it works, and that's all that matters.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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