Patent ID: 9470104
Filing Date: 2016-10-18
CPC Classification: F01D,F05D,F16J

Claim Text:
1. A seal shaft for use in an air cycle machine comprising: a body centered on a central axis, said body defining an inner bore and an outer surface including radially outwardly extending ledges at each of two axial edges, and a radially inner surface at an outer peripheral surface, with radially outwardly extending feature axially spaced on an opposed side of said radially inner surface relative to said outwardly extending ledges and a plurality of air holes extending from said outer peripheral surface to said inner bore; an axial distance measured between contact faces on said axial edges, a tolerance to said axial distance, and a greatest variation maintained between said axial distance at a plurality of spaced locations on said contact faces, with a ratio of said greatest variation to said tolerance being less than 0.2; and wherein said axial distance is 0.770 in (1.95 cm), said tolerance is 0.002 in (0.005 cm) and said greatest variation is 0.0003 in (0.762 cm).