Patent ID: 8316523
Filing Date: 2012-11-27
Classification: F01D,F05D,Y10T

Abstract:
1. A method for centering a bearing housing during a mid turbine frame assembly procedure, the mid turbine frame to be assembled including at least an inner case co-axially supported in an outer case by a plurality of radial spokes, and the bearing housing attached to the inner case, each of the spokes having an inner end abutting and connected to one of axial surfaces of the inner case, the method comprising: a) selecting one of the inner end of each spoke and each said axial surface to be machined for concentric adjustment of the bearing housing within the outer case before the respective spokes are connected to the inner case; b) measuring a radial distance D c) measuring a radial distance D d) machining the inner end of the individual spokes to suit the respective measurements taken in step (b), thereby obtaining a predetermined radial distance D between the inner diameter surface of the outer case and the inner diameter surface of the bearing housing when the mid turbine frame is assembled; or e) machining the respective axial surfaces of the inner case to suit the respective measurements taken in step (c), thereby obtaining a predetermined radial distance D between the inner diameter surface of the outer case and the inner diameter surface of the bearing housing when the mid turbine frame is assembled; f) connecting the inner ends of the spokes to the axial surfaces of the inner case, Respectfully after step (d) or (e); and wherein the sum of D