Device for centring and guiding in rotation a rotating part with interlaced arms

A turbomachine comprising a device for centring and guiding in rotation a rotating part around an axis of a turbomachine, the device comprising

• a rolling bearing comprising an outer ring radially to the outside relative to the axis;
• a bearing support radially to the outside and enclosing the outer ring;
• an annular attachment assembly of the outer ring on the bearing support, the attachment assembly comprising an annular attachment flange mounted on the bearing support and a flexible part connecting the outer ring to the attachment flange,
• the flexible part comprising:
• first arms starting out from the attachment flange in a first direction with a first radial component towards the interior in the direction of the axis;
• second arms starting out from the outer ring of the rolling bearing in a second direction with a second radial component opposite the first radial component, to the outside;
• an annular base connected to the first arms and the second arms,
• the first arms alternating circumferentially with the second arms,
• wherein the first arms face the outer ring of the rolling bearing in an axial direction, and the second arms face the attachment flange in an axial direction, and
• wherein attachments of second arms on the annular base are radially more external relative to the axis than attachments of first arms on the annular base.

A process for manufacturing a device for centring and guiding in rotation a rotating part around an axis of a turbomachine, the device comprising

• a rolling bearing comprising an outer ring radially to the outside relative to the axis;
• a bearing support radially to the outside and enclosing the outer ring;
• an annular attachment assembly of the outer ring on the bearing support, the attachment assembly comprising an annular attachment flange mounted on the bearing support and a flexible part connecting the outer ring to the attachment flange,
• the flexible part comprising:
• first arms starting out from the attachment flange in a first direction with a first radial component towards the interior in the direction of the axis;
• second arms starting out from the outer ring of the rolling bearing in a second direction with a second radial component opposite the first radial component, to the outside;
• an annular base connected to the first arms and the second arms,
• the first arms alternating circumferentially with the second arms,
• wherein the first arms face the outer ring of the rolling bearing in an axial direction, and the second arms face the attachment flange in an axial direction,
• wherein the process comprises producing the flexible part by additive manufacturing, and
• wherein attachments of second arms on the annular base are radially more external relative to the axis than attachments of first arms on the annular base.