US 12,497,907 B2
Inner ring segment, axially divided inner ring and variable vane cascade for an aircraft engine
Werner Humhauser, Moosburg (DE)
Assigned to MTU Aero Engines AG, Munich (DE)
Filed by MTU Aero Engines AG, Munich (DE)
Filed on Sep. 13, 2024, as Appl. No. 18/885,163.
Claims priority of application No. 10 2023 125 526.6 (DE), filed on Sep. 20, 2023.
Prior Publication US 2025/0092796 A1, Mar. 20, 2025
Int. Cl. F01D 17/14 (2006.01); F01D 9/04 (2006.01); F01D 17/16 (2006.01)
CPC F01D 17/14 (2013.01) [F01D 9/041 (2013.01); F01D 17/16 (2013.01); F01D 17/162 (2013.01); F05D 2220/323 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An axially divided inner ring segment for a variable vane cascade of an aircraft engine, comprising:
a vane cascade having a group of variable vanes with vane roots and an axially divided inner ring on which the vane roots of the group of variable vanes are mounted;
the inner ring formed from a plurality of inner ring segments, each of which having a row of vane mounts for mounting the vane roots of the group of variable vanes;
wherein the row of vane mounts comprises at least one play mount and at least one guide mount that differs from the at least one play mount, and
wherein the at least one guide mount is formed differently from the at least one play mount in regard to a geometry for mounting the vane roots;
wherein the group of variable vanes including at least one play vane and at least one guide vane that is different from the at least one play vane, wherein the at least one guide vane is formed differently from the at least one play vane in regard to a geometry of the vane roots, wherein the vane root of the at least one guide vane has an inner plate where guide mounts in the row of vane mounts have an inner plate seat for an inner plate of the guide vanes;
the guide mounts each having an inward projecting collar flange, which is formed between an inner plate and an outer plate of the guide vane that is arranged in the respective guide mount in the radial direction, with a high precision fit with a minimal play and/or minimal gaps formed between the collar flange and the outer plate and the inner plate.