Assembly for monitoring torsional loading of a drive shaft

Details Assembly for monitoring torsional loading of a drive shaft Assembly for monitoring torsional loading of a drive shaft

1980-09-26

1982-12-21

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

324209, G01L 310

Patent

active

043642780

ABSTRACT:
An assembly for monitoring torsional loading of a drive shaft comprises a magnetic-field generator juxtaposed to a cylindrical body of magnetostrictive material rigidly surrounding the shaft, the body being in the form of a thin foil attached to the shaft via a layer of magnetically insulating material, or a sleeve attached to the shaft by at least two spaced brackets or an outer layer of the shaft specially treated to have a homogeneous magnetic permeability in an unstressed state. A pick-up or magnetic-field sensor is juxtaposed to the body or sheath for detecting differential changes in the magnetic permeability thereof, the pick-up advantageously being connected to a demodulator which extracts a signal whose polarity is determined by the direction of loading of the shaft. In order to monitor the rotation rate of the shaft, the foil or sleeve is provided with a longitudinal slot and the demodulator is connected at its output to a low-pass filter and a high-pass filter which extract a torsion-dependent signal and a rotation-rate-dependent signal, respectively.

REFERENCES:
patent: 2365073 (1944-12-01), Haight
patent: 3340729 (1967-09-01), Scoppe
patent: 3465581 (1969-09-01), Hohenberg
patent: 3861206 (1975-01-01), Kawafune et al.
patent: 4100794 (1978-07-01), Meixner
Siemens article, vol. 7, Aug. 1954, pp. 299-302.

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