Torque measuring device by integral shaft based upon inverse magnetostriction
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United States of America Patent
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Aug 8, 2000
Grant Date -
N/A
app pub date -
Sep 22, 1998
filing date -
Sep 29, 1997
priority date (Note) -
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Abstract
In a torque measuring device having a shaft member bearing circumferentially circulating magnetic fluxes along its outer circumferential surface and adapted to measure a torque applied to the shaft member around its central axis by measuring a distortion of the magnetic fluxes caused by the torque according to an inverse magnetostriction, the shaft member has a principal cylindrical portion axially terminating in an annular end face perpendicular to the central axis, whereby a high density of magnetic fluxes corresponding to the axial length of the principal portion are generated to traverse the annular end face, so as to be detected by a magnetic field sensor to produce an output signal at a high S/N ratio. By forming a less stressed cylindrical portion axially adjacent to the principal cylindrical portion to present a second annular end face opposing the end face of the principal portion, and comparing a density of the magnetic fluxes generated to traverse the second end face with that of the principal cylindrical portion, a hysteresis free torque measurement is available.
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