Patent ID: 7571614

Claim:
A turboshaft engine comprising: a first subassembly forming an outer casing and having a first internal member and a second internal member; a second subassembly comprising a ring fixed by a set of bolts to the first internal member of said first assembly, said second subassembly further comprising a second ring in thrust relationship with the second internal member of said first subassembly, wherein an axial stress is caused between said second subassembly and said second internal member of the first subassembly when tightening said bolts, wherein cooperating portions of said second subassembly and of said second internal member define an annular chamber; a seal inserted in said annular chamber, and an annular part inserted between a first butting surface of said first subassembly and a second butting surface of said second subassembly, wherein the first butting surface of said first subassembly axially abuts against a first portion of said annular part and a second butting surface of said second subassembly axially abuts against a second portion of said annular part, said first portion being axially opposite to said second portion such that said annular part transfers said axial stress between said first and second subassemblies via said first and second butting surfaces, said butting surfaces being located radially internally with respect to said seal, and wherein a contact area of said first butting surface in contact with said first portion is larger than a contact area of said second butting surface in contact with said second portion so as to increase an axial contact between the second subassembly and the second internal member of the first subassembly thereby preventing an opening of said annular chamber and a destruction of said seal.