Patent ID: 8939864
Filing Date: 2015-01-27
Classification: F01D,F05D,F16H

Abstract:
1. A turbine engine comprising: a fan shaft; at least one tapered bearing mounted on the fan shaft, the fan shaft including at least one radially extending passage adjacent the at least one tapered bearing; a fan mounted for rotation on the tapered bearing; an epicyclic gear train coupled to drive the fan, the epicyclic gear train including a carrier supporting intermediate gears that mesh with a sun gear, and a ring gear surrounding and meshing with the intermediate gears, each of the intermediate gears being supported on a respective journal bearing, wherein the epicyclic gear train defines a gear reduction ratio of greater than or equal to about 2.3; and a turbine section coupled to drive the fan through the epicyclic gear train, the turbine section having a low pressure turbine that includes a pressure ratio that is greater than about 5, the fan includes a pressure ratio that is less than about 1.45, and the fan has a bypass ratio of greater than about ten (10).