Torque detection apparatus

Details Torque detection apparatus Torque detection apparatus

1988-05-10

1989-11-21

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

324208, 336135, G01L 310

Patent

active

048814148

ABSTRACT:
A torque detection apparatus for measuring a torque applied between a drive shaft and an output shaft which is applicable to an electric power steering system of a motor vehicle. The torque detection apparatus is provided between the drive and output shafts and comprises first and second rotating bodies which are respectively at one end portions coupled fixedly to the drive and output shafts, the first rotating body being rotatable in accordance with rotation of the drive shaft and the second rotating body being rotatable in accordance with rotation of said output shaft. The first and second rotating bodies are shaped cylindrically and the first rotating body has on its outer circumferential surface magnetic toothed portions and the second rotating body has on its inner circumferential surface magnetic toothed portions. The first and second rotating bodies are disposed coaxially so that the magnetic toothed portions are magnetically engaged with each other so as to form a first magnetic flux path and a second magnetic flux path. The torque between the drive and output shafts is measured on the basis of the difference between the amounts of the magnetic fluxes passing through the first and second magnetic flux paths.

REFERENCES:
patent: 1354698 (1920-10-01), Shallcross
patent: 2826064 (1958-03-01), Hastings
patent: 3045196 (1962-07-01), Packard
patent: 3172063 (1965-03-01), Lindstrom et al.
patent: 4356732 (1982-11-01), Hachtel et al.
patent: 4712433 (1987-12-01), Hochstein et al.
"Noncontact Torque Sensor", by Ichiro Sasada et al; IEEE 1985 IECON'85, pp. 73-79.

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