公开(公告)号：US11933190B2

公开(公告)日：2024-03-19

申请号：US18300558

申请日：2023-04-14

Applicant: RTX Corporation

Inventor： Marc J. Muldoon ,  Michael E. McCune ,  Keith B. Allyn

IPC: F01D5/02 ,  F01D9/02 ,  F01D25/24 ,  F01D25/28

CPC classification number: F01D25/28 ,  F01D9/02 ,  F01D25/24 ,  F05D2240/14 ,  F05D2260/30 ,  F05D2260/606

Abstract: A gear reduction reduces a speed of a fan rotor relative to a speed of a fan drive turbine. A rigid connection between a fan case and an inner core housing includes a plurality of A-frames connected at a connection point to the fan case. Legs in the A-frames extend away from the connection point in opposed circumferential directions to be connected to a compressor wall of the inner core housing. The rigid connection also includes a plurality of fan exit guide vanes rigidly connected to the fan case. A lateral stiffness ratio of the lateral stiffness of the plurality of fan exit guide vanes and a lateral stiffness of a combination of the plurality of A-frame, the compressor wall, and a fan intermediate case which is forward of the low pressure compressor being greater than or equal to 0.6 and less than or equal to 2.0.