Rotor keyhole fillet for a gas turbine engine

Abstract

A rotor for a gas turbine engine includes an annular structure having a blade slot. A hub engagement feature is provided on the annular structure. The hub engagement feature includes first and second surfaces transverse to one another and joined by a fillet that is recessed with respect to the first and second surfaces. A method of manufacturing a rotor includes the steps of machining an annular hub engagement feature into a rotor. The hub engagement feature includes first and second surfaces transverse to one another and is joined by a fillet that is recessed with respect to the first and second surfaces. The method includes the step of peening the fillet, and grinding the first and second surfaces.

What is claimed is: 
     
         1 . A rotor for a gas turbine engine comprising:
 an annular structure having a blade slot; and   a hub engagement feature provided on the annular structure, the hub engagement feature including first and second surfaces transverse to one another and joined by a fillet that is recessed with respect to the first and second surfaces.   
     
     
         2 . The rotor according to  claim 1 , wherein the first and second surfaces are normal to one another. 
     
     
         3 . The rotor according to  claim 1 , wherein the fillet includes a peened surface. 
     
     
         4 . The rotor according to  claim 3 , wherein the annular structure is constructed from a nickel alloy. 
     
     
         5 . The rotor according to  claim 3 , wherein the first and second surfaces are provided by ground surfaces. 
     
     
         6 . The rotor according to  claim 1 , wherein the first and second surfaces are non-tangential to the fillet. 
     
     
         7 . A rotor assembly for a gas turbine engine comprising:
 a shaft;   a rotor supporting a blade and including a hub engagement feature, the hub engagement feature including first and second rotor surfaces transverse to one another and joined by a fillet that is recessed with respect to the first and second rotor surfaces; and   a hub supported on the shaft and engaging the hub engagement feature.   
     
     
         8 . The rotor assembly according to  claim 7 , comprising a nut secured to the shaft and applying a clamping load to the hub engagement feature via the hub. 
     
     
         9 . The rotor assembly according to  claim 8 , wherein the hub includes first and second hub surfaces respectively engaging the first and second rotor surfaces under the clamping load, the first and second hub surfaces spaced from the fillet. 
     
     
         10 . The rotor assembly according to  claim 9 , wherein the first and second rotor surfaces are normal to one another. 
     
     
         11 . The rotor assembly according to  claim 7 , wherein the fillet includes a peened surface. 
     
     
         12 . The rotor assembly according to  claim 11 , wherein the rotor is constructed from a nickel alloy. 
     
     
         13 . The rotor assembly according to  claim 11 , wherein the first and second rotor surfaces are provided by ground surfaces. 
     
     
         14 . The rotor assembly according to  claim 7 , wherein the first and second rotor surfaces are non-tangential to the fillet. 
     
     
         15 . A method of manufacturing a rotor comprising the steps of:
 machining an annular hub engagement feature into a rotor, the hub engagement feature including first and second surfaces transverse to one another and joined by a fillet that is recessed with respect to the first and second surfaces;   peening the fillet; and   grinding the first and second surfaces.   
     
     
         16 . The method according to  claim 15 , wherein the grinding step is performed after the peening step. 
     
     
         17 . The method according to  claim 15 , wherein the first and second surfaces are non-tangential to the fillet.