Patent ID: 6142757
Filing Date: 2000-11-07
Classification: F01D,F04C

Abstract:
An integral oil pump for an apparatus having a rotatable shaft supported by a journal bearing, the integral oil pump comprising a housing having an opening for the shaft and a cavity disposed within the housing, a ring gear encircling, but not touching the shaft and at least one keyway disposed in an inner surface of the ring gear, a protrusion extending from the shaft into the keyway to rotate the ring gear with the shaft, a floating gear meshing with the ring gear, the cavity enclosing the ring and floating gears with a minimum amount of clearance between the gears and the cavity, an oil inlet portion of the cavity disposed on one side of the area where the gears mesh and an oil outlet portion of the cavity disposed on the other side of the area where the gears mesh, an inlet port in fluid communication with the oil inlet portion of the cavity and an outlet port in fluid communication with the oil outlet portion of the cavity, the oil outlet port also being in fluid communication with the bearing, whereby the integral oil pump supplies lubricating oil to the bearing when the apparatus is operating and the shaft is free to move within the bearing to its operating position without affecting the clearances in the integral pump.