Method of measuring long shaft torque

Details Method of measuring long shaft torque Method of measuring long shaft torque

1978-07-17

1980-06-24

Ruehl, Charles A.

Measuring and testing

Brake testing

Single wheel rotating and resistance measuring means

G01L 310

Patent

active

042089042

ABSTRACT:
A method of measuring long shaft torque by pre-recording two magnetic tapes, through air gaps, with similar continuous sine wave signals; and by fixing the pre-recorded tapes spaced longitudinally apart as loops around the long shaft at no torque load, and with the continuous sine wave signals of the respective tape loops in approximate phase; and by each tape loop being opposed by a pair of air-spaced, diametrically positioned playback heads, one pair being rotationally adjustable to precisely synchronize the phases of the sine wave signals of both tapes, and both pairs of playback heads cooperating to pick up sine wave signals from both tape loops; and by transmitting the sine wave signals for each side, respectively, to an associated electronic circuit, each circuit for producing an analog voltage proportional to half of the transmitted torque of the long shaft as it rotates under a torque load and plus and minus voltage errors due to rotating long shaft skew; and by finally summing and integrating the half torque voltages to a voltage proportional to the full transmitted voltage with the plus and minus voltage errors cancelling out, the result being readable on a voltmeter calibrated for torque.

REFERENCES:
patent: 2947168 (1960-08-01), Yang
patent: 3587305 (1971-06-01), Parkinson
patent: 3824848 (1974-07-01), Parkinson
patent: 3935733 (1976-02-01), Schindler

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