Shaft failure monitoring system using angled rotating teeth and

Details Shaft failure monitoring system using angled rotating teeth and Shaft failure monitoring system using angled rotating teeth and

1988-03-23

1989-05-23

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324262, 324233, 34087031, G01B 714, G01R 3300

Patent

active

048334057

ABSTRACT:
A shaft monitoring system for sensing axial movement of a shaft, especially in a gas turbine engine, comprises a toothed wheel attached to and rotatable with the shaft, and a pair of inductive sensors disposed radially of the toothed wheel for sensing the passage of the teeth as the shaft rotates. In one embodiment, the toothed wheel has two axially-spaced sets of teeth, one set straight cut and the other set diagonal cut, so that the phase difference between the respective outputs of the sensors varies with axial movement of the shaft. In another embodiment, the sensors are positioned at opposite axial ends of the toothed wheel, so that axial movement of the shaft causes one sensor output to increase in amplitude while the other decreases.

REFERENCES:
patent: 3190125 (1965-06-01), Holz
patent: 3641535 (1972-02-01), Knopf
patent: 3863235 (1975-01-01), McKee et al.
patent: 4518917 (1985-05-01), Oates et al.
patent: 4746859 (1988-05-01), Malik
patent: 4764767 (1988-08-01), Ichikawa et al.

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