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Oil pumps for turbine engines are usually of the positive-displacement gear type, with a relief valve to prevent excessive pressure. A modified gear-type pump is called the "gerotor pump."

The gear-type pump consists of a driving and driven gear. The pump is driven from the engine accessory section and causes the oil to pass around the outside of the gears in pockets formed by the gear teeth and the pump casing. The pressure developed is proportional to engine rpm up to the point where the pressure relief valve opens and limits the pressure output of the pump.

The gerotor pump has two moving parts, an inner toothed element meshing with an outer toothed element. The inner element has one less tooth than the outer, and the missing tooth provides a chamber to move the fluid from the intake to the discharge port. Both elements are mounted eccentrically to each other, the inner one mounted on the shaft and the outer one meshed with it. Figure 2.13 is a picture of the gerotor pump, showing both inner and outer toothed elements.

Simplex Fuel Nozzle
Figure 2.13. Gerotor Booster Pump.



David L. Heiserman, Editor

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Revised: June 06, 2015