JTS Roots blower is a positive displacement machine that uses two or more rotating lobes in a cylinder. The impellers intermesh with each other using timing gears and suck air in from one side to deliver the air on the other side. There is no actual compression ratio built into the machine, it is simply an air mover. Compression is caused because the induced air is forced into a closed conduit, thereby the atmospheric air becomes pressurized after it has left the Roots blower. The rotating impellers intermesh quite closely, but contact is avoided by using precision timing gears. Although these gears are splash lubricated, because they are external to the cylinder barrel, the machine provides oil free air.
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