Automotive load cells having centralized, multi-axis, loose tolerance
overload/limit stops provide improved strain gauge response. The modular, integrated
stop assemblies magnify sensor substrate deflection by use of opposed concave (Belleville)
springs are used in direct contact with the substrate to accommodate Z axis
deflection and Mx/My moment angular rotation. A flanged guide member on the load
stud permits a wide range of geometries. The substrate is thickened around the
load stud hole and the outboard support bolt holes. Hollow rivets assist in design
modularity. Strain gauges are placed at the yield zones symmetrically with respect
to the X axis. The substrate hole Mx/My gap is larger than the stop bracket hole
to insure a positive stop for Mx/My moments prior to yield. The inventive multi-axis
stop assembly is used in any type load cell, including rectangular, thinned, notched,
necked/dogbone, or cantilever substrates with any strain gauge layout configuration.
