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Mechanical coupling for a rotor shaft assembly of dissimilar materials

United States Patent

May 5, 2009
View the Complete Patent at the US Patent & Trademark Office
A mechanical coupling for coupling a ceramic disc member to a metallic shaft includes a first wedge clamp and a second wedge clamp. A fastener engages a threaded end of a tie-bolt to sandwich the ceramic disc between the wedge clamps. An axial spring is positioned between the fastener and the second wedge clamp to apply an axial preload along the longitudinal axis. Another coupling utilizes a rotor shaft end of a metallic rotor shaft as one wedge clamp. Still another coupling includes a solid ceramic rotor disc with a multiple of tie-bolts radially displaced from the longitudinal axis to exert the preload on the solid ceramic rotor disc.
Shi; Jun (Glastonbury, CT), Bombara; David (New Hartford, CT), Green; Kevin E. (Broad Brook, CT), Bird; Connic (Rocky Hill, CT), Holowczak; John (South Windsor, CT)
Hamilton Sundstrand Corporation (Rockford, IL)
11/ 221,440
September 8, 2005
This invention was made with government support under U.S. Department of Energy Contract No. DE-FC26-00CH11060 (formerly DE-FC36-00CH11060 and DE-FC02-00CH11060). The government therefore has certain rights in this invention.