| 摘要 |
A support shaft (44) provides lubrication to a journal bearing (46) during windmilling operation of a gear set (28). A primary oil pump (34) provides oil from an oil supply (36) during driven operation of the fan (18), and a secondary oil pump (38) provides oil from an internal sump (35) during windmilling operation of the fan (18). During driven operation of the fan (18), oil is pumped with the primary oil pump (32) through a primary oil flow path (60) to an outer surface of the support shaft (44). During windmilling fan operation, oil is pumped from an internal sump (35) with a secondary oil pump (38) through the secondary oil flow path (64). The secondary oil flow path (64) has a smaller flow capacity, and the secondary oil pump (38) is a smaller capacity pump. |
