Axisymmetrical intermediate case part including an insert positioned in an annular groove

Patent metadata

Field	Value
Publication number	US-9677425-B2
Application number	US-201313951681-A
Country	US
Kind code	B2
Filing date	Jul 26, 2013
Priority date	Aug 2, 2012
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

An axisymmetrical portion for an aircraft turbojet engine intermediate case intended to protrude downstream from an outer axisymmetrical portion of the intermediate case is provided. The axisymmetrical portion includes an annular groove radially open outwards, and at least one insert laid out inside the groove, which covers each internal face of the groove and which is radially open outwards.

First claim

The invention claimed is:

1. An axisymmetrical portion for an aircraft turbojet engine intermediate case which extends downstream from said intermediate case, the axisymmetrical portion comprising:
an annular groove radially open outwards, the groove including an axisymmetric front face, an axisymmetric rear face facing the front face, and a cylindrical bottom face connecting the front and rear faces at internal radial ends thereof; and
an insert laid out inside the groove, the insert including a front wing, a back wing, and a bottom wall connecting the front and back wings, which respectively abut and cover the front face, the rear face, and the bottom face of the groove, and the insert is radially open outwards,
wherein an outer shape of the insert matches a shape of the groove,
wherein a shape of the front face and a shape of the rear face are different from each other such that the groove is not symmetric relative to a middle radial plane of the groove,
wherein at least one of the front face, the rear face, and the bottom wall of the insert includes a rib which is received in a complementary throat provided in the axisymmetric portion, and
wherein a material of the insert is more wear resistant than a material of the axisymmetrical portion including the groove.

2. The axisymmetrical portion according to claim 1 , comprising:
several circumferentially aligned annular sectors, in which the groove is formed, and
a plurality of the inserts, each of the inserts associated with each of the annular sectors, which forms a segment of a ring with a length substantially equal to the circumferential length of the associated annular sector.

3. The axisymmetrical portion according to claim 2 , wherein each circumferential end of each of the inserts bears a tab which is capable of abutting against circumferential end face of the associated annular sector.

4. The axisymmetrical portion according to claim 1 , wherein the insert is adhesively bonded inside the groove.

5. A method for setting into place the insert on an axisymmetrical portion of an aircraft turbojet engine intermediate case according to claim 1 , the axisymmetrical portion including an annular groove radially open outwards,
said method comprising a step for machining the faces of the groove and a step for introducing the insert into the machined groove.

6. The method according to claim 5 , wherein the machining step includes machining all the faces of the groove so that the shape of the groove at the end of the machining step matches the shape of the insert.

7. The axisymmetrical portion according to claim 1 , wherein the bottom wall is axially extended forwards and rearwards with two ribs which are received into complementary throats provided in the axisymmetric portion.

8. The axisymmetrical portion according to claim 1 , wherein the rib extends radially inwards from a radially internal face of the bottom wall which is received into the complementary throat provided in the bottom face of the groove.

Assignees

• Snecma

Inventors

• Lavignotte Richard
• Reghezza Patrick Jean-Louis

Classifications

• F02K1/70 Primary

  using thrust reverser flaps or doors mounted on the fan housing · CPC title

• F02C7/06

  Arrangements of bearings (bearings F16C); Lubricating ({of turbo machines F01D25/18; of machines or} engines in general F01M) · CPC title

• F05D2260/36

  by a form fit connection, e.g. by interlocking · CPC title

• Y10T29/4932

  Turbomachine making · CPC title

• F02C7/20 Primary

  Mounting or supporting of plant; Accommodating heat expansion or creep · CPC title