Patent ID: 6663343
Filing Date: 2003-12-16
Classification: F04D,Y10T

Abstract:
A system for mounting at least one impeller on an impeller shaft without keys and keyways, comprising:an impeller shaft having tapered threads; a threaded collar positioned on the impeller shaft and defining a central bore having threads effective to engage the tapered threads on the impeller shaft; at least one impeller positioned on the impeller shaft and in contact with the threaded collar, the tapered threads of the impeller shaft having a first surface generally facing the impeller and a second surface generally facing away from the impeller, said first surface defining a first angle with the longitudinal axis of the impeller shaft and defining a second angle with a plane normal to said longitudinal axis, wherein said first angle is less than said second angle; and an arrangement axially forcing the impeller into contact with the threaded collar and axially forcing the threaded collar into torque transmitting contact with the tapered threads of the impeller shaft.