Gear pump, pumping apparatus including the same, and aircraft fuel system including gear pump

摘要

A pumping apparatus includes a gear pump (16) in fluid communication with a boost pump. The gear pump (16) includes a pump housing (28), a first gear (30), and a second gear (32). The first and second gears have gear teeth and trunnions (26,34) on opposite sides thereof, and are disposed in the pump housing (28). The gear teeth of the first and second gear are meshed in a mesh region (52). An inlet cavity (58) is defined adjacent to the first and second gears, on one side of the mesh region (52). A pump outlet (60) is defined on an opposite side of the mesh region (52) from the inlet cavity (58). A bearing (36,38) is configured to support at least one trunnion (26,34) of the first gear and/or the second gear. A bearing interface (40) is defined between the bearing and the at least one trunnion. A flow path (68) is defined between the bearing interface (40) and the inlet cavity (58).