US 12,467,364 B1
Stress redistribution system for threaded connection of a gas turbine engine spool
Clay R. Johnstun, Chandler, AZ (US)
Assigned to HONEYWELL INTERNATIONAL INC., Charlotte, NC (US)
Filed by HONEYWELL INTERNATIONAL INC., Charlotte, NC (US)
Filed on Oct. 25, 2024, as Appl. No. 18/926,960.
Int. Cl. F01D 5/02 (2006.01)
CPC F01D 5/026 (2013.01) [F05D 2240/61 (2013.01); F05D 2260/31 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for a threaded connection, the system comprising:
a shaft configured to rotate about an axis, the shaft configured as a hollow cylinder with an inner surface and a wall defined around the inner surface; and
a fastener configured for threaded engagement with the shaft at a threaded connection, the fastener configured to apply a compressive load holding the shaft under a tensile load, the threaded connection extending from a loaded end adjacent a place of application of the compressive load, to an unloaded end opposite the loaded end,
wherein the threaded connection is defined along the axis by the nut and threads on the shaft,
wherein the inner surface is configured with a contour so that the wall has a first thickness at the loaded end and a second thickness at the unloaded end that is different than the first thickness,
wherein the contour forms a void along an axial length of the threaded connection and on an opposite side of the wall from the threaded connection, wherein the void is disposed axially solely within the threaded connection, wherein the wall has a varying thickness that extends from the loaded end to the unloaded end where the wall is thinner than a standard thickness of the wall outside the contour,
wherein the wall is configured with more compliance at the loaded end as compared to at the unloaded end to reduce a stress resulting from the load at the loaded end and to redistribute the stress throughout the threaded connection.