Expanded range monopole torque measuring system

Details Expanded range monopole torque measuring system Expanded range monopole torque measuring system

G - Physics

01

L

73/3, 73/61, 73/

G01L 3/10 (2006.01)

Patent

CA 1201302

ABSTRACT OF THE DISCLOSURE A torque measurement system for measuring shaft torque has two toothed wheels mounted in spaced apart relationship. Each of the wheels has a plurality of axially extending spaced teeth along its periphery extending into spaces between the teeth of the other, forming an interlaced array of teeth having tooth spacing interstices therebetween. A discontinuity is provided in the tooth pattern at at least one location around the periphery of the two wheels to serve as an index marker. A single detector such as a variable relunctance sensor is mounted proximate the wheels to provide output signals repre- sentative of circumferential widths of tooth spacing inter- stices and also representative of the index marker. The widths of the interstices change upon shaft torque deflection, and signals from the sensor are processed to produce a DC signal proportional to torque. The two wheels can be offset in a no load condition so that adjacent tooth spacing interstices are approximately equal in a torque deflection range of interest.

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