Sealing the fastening of a bearing support in a turbomachine

Abstract

A turbomachine including a shaft guided in an upstream bearing and a downstream bearing, the upstream bearing being carried by a first annular support that is fastened by bolts to a casing via a second annular support that carries the downstream bearing, wherein the ends of the fastener bolts are covered by an annular cover sealingly fastened to the second support or to the casing.

1 . A turbomachine including a shaft guided in an upstream bearing and a downstream bearing, the upstream bearing being carried by a first annular support that is fastened by bolts to a casing via a second annular support that carries the downstream bearing, wherein the ends of the bolts for fastening the first support to the second support are covered by an annular cover sealingly fastened to the second support or to the casing. 
   
   
       2 . A turbomachine according to  claim 1 , wherein the bolts for fastening the first support are on the outside of the support. 
   
   
       3 . A turbomachine according to  claim 1 , wherein the cover is of U-shaped section comprising two parallel walls sealingly engaged against a cylindrical wall of the second support and inside a cylindrical wall of the casing. 
   
   
       4 . A turbomachine according to  claim 3 , wherein annular sealing rings are mounted in annular grooves in the walls of the cover or in the cylindrical walls of the second support and of the cover. 
   
   
       5 . A turbomachine according to  claim 1 , wherein the ends of the bolts situated inside the cover carry nuts. 
   
   
       6 . A turbomachine according to  claim 1 , wherein a sealing ring is mounted in an annular groove in an upstream radial face of the second support or in a corresponding downstream radial face of the first support. 
   
   
       7 . A turbomachine according to  claim 1 , wherein the cover is made of a material having a coefficient of expansion similar to the coefficients of expansion of the second support and of the casing. 
   
   
       8 . A turbomachine according to  claim 1 , wherein the cover has a downstream cylindrical rim fastened by bolts to a downstream cylindrical rim of the second support. 
   
   
       9 . A turbomachine according to  claim 1 , wherein the cover is fastened by bolts to the casing. 
   
   
       10 . An annular sealing cover for use in a turbomachine according to  claim 1 , wherein the cover presents a U-shaped section with two parallel cylindrical walls that are respectively a radially inner wall and a radially outer wall, with at least the radially outer wall including an outer annular groove for receiving a sealing ring. 
   
   
       11 . A cover according to  claim 10 , made of composite material or of metal, such as titanium, for example. 
   
   
       12 . A cover according to  claim 10 , including a cylindrical rim extending its radially inner cylindrical wall in the opposite direction and including regularly distributed orifices for passing fastener means.