Gas turbine fan casing having a belt for fastening equipment

Abstract

The invention relates to a gas turbine fan casing ( 10 ) comprising an annular casing wall ( 12 ) centered on a longitudinal axis (X-X) of the casing and at least one fastening belt ( 100 ) mounted on the periphery of the casing wall to fasten equipment on the casing, each fastening belt comprising two distinct annular flanges ( 102, 104 ) each having an L-shaped straight section, said flanges being fastened to each other and maintained on the wall of the casing by tightening of the inverted cone type.

1 . A gas turbine fan casing comprising an annular casing wall centered on a longitudinal axis of the casing and at least one fastening belt mounted on a periphery of the casing wall to fasten equipment on the casing, and wherein, each fastening belt comprises two distinct annular flanges each having an L-shaped straight section, said flanges being fastened to each other and maintained on the wall of the casing by an inverted cone tightening mechanism. 
     
     
         2 . The casing according to  claim 1 , wherein two flanges of a same fastening belt are maintained by tightening on a crown of the wall of the casing having two opposite planes that are inclined relative to the longitudinal axis of the casing. 
     
     
         3 . The casing according to  claim 2 , wherein each flange of a same fastening belt has a contact leg bearing on one of the inclined planes of the crown and a tightening leg designed to be assembled to the tightening leg of the other flange of said belt. 
     
     
         4 . The casing according to  claim 3 , wherein the planes of the crown are inclined in an open cone toward an inside of the wall of the casing, the casing further comprising tightening devices to assemble the tightening legs of two flanges of the fastening belt to each other by bringing said tightening legs closer to each other so as to ensure tightening thereof on the wall of the casing. 
     
     
         5 . The casing according to  claim 3 , wherein the planes of the crown are inclined in an open cone toward the outside of the wall of the casing, the casing further comprising tightening devices to assemble the tightening legs of the two flanges of the fastening belt to each other by separating them from one another so as to ensure tightening thereof on the wall of the casing. 
     
     
         6 . The casing according to  claim 4 , wherein the tightening devices comprise screw/nut systems. 
     
     
         7 . The casing according to  claim 1 , comprising a plurality of fastening belts axially spaced apart from each other. 
     
     
         8 . The casing according to  claim 7 , wherein at least some of the fastening belts are assembled to each other. 
     
     
         9 . The casing according to  claim 1 , wherein the casing wall is made from composite material with a fibrous reinforcement densified by a matrix. 
     
     
         10 . An aeronautic gas turbine engine having a fan casing according to  claim 1 .