Torque sensor

Measuring and testing – Dynamometers – Responsive to torque

Reexamination Certificate

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Reexamination Certificate

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07104145

ABSTRACT:
The torque sensor outputs a signal from a first detector which corresponds to the rotation angle of a first shaft, as a first alternating signal the phase of which changes in accordance with this change in the rotation angle, via a resistance and a capacitor which function as a low-pass filter and a high-pass filter. A signal is output from a second detector corresponding to the change in the rotation angle of a second shaft capable of performing relative rotation, elastically, with respect to the first shaft, as a second alternating signal, the phase of which changes in accordance with the change in the rotation angle, via a resistance and a capacitor which function as a low-pass filter and high-pass filter. A value corresponding to the torque transmitted by the first and second shafts is determined from a phase difference correspondence signal the waveform of which changes in accordance with change in the phase difference between the first alternating signal and the second alternating signal.

REFERENCES:
patent: 4444064 (1984-04-01), Wolfinger
patent: 4513628 (1985-04-01), Kohama et al.
patent: 4805463 (1989-02-01), Kelledes et al.
patent: 4874053 (1989-10-01), Kimura et al.
patent: 5398555 (1995-03-01), Ueno et al.
patent: 6456090 (2002-09-01), Ishikawa et al.
patent: 6520031 (2003-02-01), Madni et al.
patent: 6628343 (2003-09-01), Yamaguchi et al.
patent: 6892588 (2005-05-01), Nagase et al.
patent: 1 134 567 (2001-09-01), None
patent: 2002-350181 (2002-12-01), None

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