| 摘要 |
Disclosed is a two-stage pump comprising a first pump 2 having a rotating pump element 23, such as an impeller, driven by a support shaft 74, a second pump 4 having a driving pinion (gear)11 meshed with a driven pinion (gear) 12, and a transmission 77, 79 connecting the driving gear to the support shaft, the transmission being contained in the second pump, wherein the support shaft is partially contained in a reaming 75 passing through the driven gear and is supported in the reaming by a first bearing 87 formed between the support shaft and the driven gear. Preferably the first bearing comprises an axial stop 88. A sealing gasket may be arranged around the support shaft forming a second bearing 89 supporting the support shaft. Preferably the first and second bearings are hydrodynamic. The rotating pumping element may include a fluid outlet volute 92 of changing shape. The invention provides a compact pumping arrangement with a reduced number of parts. The pump may be used for supplying an aircraft engine with fuel. |
