Patent ID: 6164658
Filing Date: 2000-12-26
Classification: F01D,F16J,Y10S

Abstract:
A hydraulic seal for providing a seal between two concentric rotatable shafts of a gas turbine engine comprising a radially outer element for attachment to a radially outer shaft and a radially inner element for attachment to a radially inner shaft, said radially outer element being configured to define an annular, radially inwardly directed channel to operationally contain a hydraulic fluid and said radially inner element being configured to define at least one radially outwardly directed annular fin to operationally project into said hydraulic fluid, at least one of said outer and inner elements being provided with frangible means for its attachment to its associated shaft to permit relative axial movement between said at least one outer and inner element and its associated shaft following breakage of said frangible means, said channel and said fin being so located that in the event of breakage of one of said shafts, relative movement between said channel and said fin will occur to cause breaking of said frangible means thereby allowing movement of said shafts.