Method of producing torque sensor shafts

Details Method of producing torque sensor shafts Method of producing torque sensor shafts

1992-04-30

1993-04-27

Jones, David

Metal deforming

By shot-blasting

310 26, 29 907, 51320, B21D 3106, H01L 4112

Patent

active

052051455

ABSTRACT:
The invention relates to a method of producing magnetostriction type torque sensor shafts adapted to detect a change in permeability when a torque is applied. A plurality of shot peening operations are applied to the surface of a torque sensor shaft in such a manner that the diameter of shot particles to be used is decreased each time. This arrangement ensures that the region in which the residual stress is at a maximum and approximately constant lies over a wide range as seen in the direction of the depth from the outermost surface of the shaft and extends from a deep area to an area close to the surface of the shaft. As a result, the hysteresis and nonlinearity of the shaft are improved and it becomes possible to use a wide range of excitation frequencies.

REFERENCES:
patent: 3073022 (1963-01-01), Bush et al.
patent: 4933580 (1990-06-01), Ishino et al.

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