| 摘要 |
An unpressurised aeronautical generator ( 2 ), is provided which includes a two stage oil pump ( 6 ) comprising a centrifugal pump ( 8 ) and a gerotor pump ( 26 ). The centrifugal punp draws oil through openings ( 18 ) in a manifold, pressurises it and supplies it to the gerotor pump. The gerotor pump then pumps the pressurised oil throughout the generator. A small gerotor pump is used, which is still sufficient to operate at low pressures and high altitudes.
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