Gear pump intended, in particular, as a high pressure fuel pump
AssigneeSafran Aircraft Engines
InventorsPhilippe Vertenoeuil, Bellal Waissi
Life of this patent
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Abstract
A geared fuel pump (4′) operates to supply a determined flow but at low or zero pressure rise. It is planned to add gland packing (46) between support bearings (19) of the pinions (11), or between some of them, to provide hydrodynamic lift for these bearings, by delimiting a closed cavity (47) to provide lift by a fluid with better viscosity properties instead of using the fluid itself that is pumped. Possible application to fuel pumps for aircraft engines, in which the pump (4′) is a high pressure pump associated with a low pressure pump.
Claims15
A gear fuel pump comprising a housing, two pinions meshing with each other in a chamber of the housing, two first bearings each supporting one of two first stubshafts of the pinions, two second bearings each supporting one of two second stubshafts of the pinions, the first bearings and the second bearings being housed in the chamber in the housing, the first stubshafts turning in the first bearings with first gaps and the second stubshafts turning in the second bearings with second gaps, the first and the second gaps containing fluid hydrodynamic lift layers, wherein gland packing is disposed between the second bearings and the pinions, said gland packing isolating closed cavities surrounding the second gaps and delimited by the housing, the second bearings and the pinions, the closed cavities containing a fluid different from a fluid, that is a fuel, pumped by the pinions.
Dependencies are inferred from the claim text.