Patent ID: 6164119
Filing Date: 2000-12-26
Classification: B60G,B60T,G01L

Abstract:
A stress sensor for measuring vehicle wheel operating forces, the operating forces formed as four divided stress components generated when a braking force is applied to the vehicle wheel, comprising:one set of biaxial 90.degree. sensor segments attached with respect to an axle of a vehicle, said one set of biaxial 90.degree. sensor segments comprising a pair of strain gauges at right angles on an obverse face and a reverse face of a plane substrate and is attached with said axle of the vehicle;a bridge circuit having a strain gauge of said one set of biaxial 90.degree. sensor segments for converting the strain amount detected by each of said strain gauges into an electric signal; andan arithmetic means connected to said bridge circuit for calculating stresses produced when the braking force is applied to the vehicle wheels in the form of four divided stress components, namely,a stress of F direction (horizontal to a road surface),a stress of N direction (vertical to a road surface),a stress of FB direction (torsional moment direction of a vehicle axle),a stress of S direction (axle longitudinal direction),by applying four prepared equations to said electric signals which are responsive to each strain gauge of said one set of biaxial 90.degree. sensor segments from said bridge circuit respectively.