DEVICE FOR CENTRING AND GUIDING ROTATION OF TURBINE ENGINE SHAFT INCLUDING IMPROVED MEANS FOR RETAINING EXTERNAL BEARING RING Russian patent published in 2018 - IPC F01D21/04 F01D25/16 

FIELD: machine building.

SUBSTANCE: device for aligning and guiding the rotation of the shaft of the gas turbine engine includes a rolling bearing comprising an outer ring, bearing support surrounding the outer ring, collar between the outer ring and the bearing support, means for connecting the outer ring to the bearing support and means for retaining the outer ring in the axial direction. Means for connecting the outer ring to the bearing support comprise an annular mounting flange mounted on the bearing support, and elastically deformable means connecting the outer ring with the fixing flange. Means for retaining the outer ring in the axial direction ensure that the outer ring is retained in the event of rupture of the elastically deformable means. Means of containment contain the first means and the containment element. First means are separated from the casing and have a radially inner portion that extends into a recess made in the radially outer surface of the outer ring, and a radially outer portion projecting radially and outwardly with respect to the radially outer surface of the outer ring. In the case of rupture of the elastically deformable means, the mounting flange prevents axial movement of the radially outer portion of the first means in the first direction oriented towards the elastically deformable means, and the bearing support prevents axial movement of the radially outer portion of the first means in the second direction opposite to the first direction. Retaining member is separated from the casing and located axially opposite the radially outer portion of the first means, forming an abutment preventing the axial movement of the first means in the first direction. Another invention relates to a gas turbine engine comprising the above-mentioned device. In assembling the above-mentioned device, the first means are moved radially outwardly inward with respect to the axis of rotation of the outer ring so as to insert said radially inner portion of the first means into a corresponding recess formed in the outer ring, and thereby obtain a second strong assembly comprising an outer ring, connection means, a holding member, and first means. Then, the second strong assembly is moved relative to the first strong assembly consisting of a bearing support and a pre-installed cage on it until the outer ring is covered by the bearing support. Then the mounting flange is fixed to the bearing support.

EFFECT: group of inventions makes it possible to maintain the outer ring of the bearing in both directions along the axis in the case of rupture of elastically deformable means.

11 cl, 9 dwg