Patent ID: 8438858
Filing Date: 2013-05-14
Classification: F01D,Y02T

Abstract:
1. A miniature gas turbine engine comprising: a rotor shaft defining a cavity therein, said rotor shaft mounted for rotation about a longitudinal axis, said rotor shaft including a threaded end segment; a compressor wheel interference fit to said rotor shaft; a turbine wheel welded to said rotor shaft at a weld; a permanent magnet generator mounted to said rotor shaft; a forward rotor shaft bearing mounted forward of said permanent magnet generator; an aft rotor shaft bearing mounted adjacent said cavity; a seal ring mounted to said rotor shaft within a groove located axially along said shaft between said aft rotor shaft bearing and said turbine wheel; and a fastener threaded to said threaded end segment to axially retain said rotor shaft and provide an axial preload along said longitudinal axis.