Vibration transducer assembly

摘要

A vibration transducer for sensing engine knock. On embodiment for resonance upon vibration at frequencies in the range of 5-7 KHz has a centrally stanchion-supported overhanging metal disc with an annular stiffening portion formed with in transverse section with contracurvature and generally rectangular configuration for minimizing ringing. Piezoelectric material is bonded to the disc surface inwardly of the stiffening portion for providing an electrical signal during resonant disc flexure. A second embodiment for resonance upon vibration at frequencies in the range of 9-15 KHz has a centrally stanchion-supported overhanging metal disc with an annular stiffening portion for minimizing ringing formed in transverse section with contracurvature comprising a generally semicircular convolution. Piezoelectric material is bonded to the disc surface and bridges the stiffening portion and provides an electrical signal during resonant disc flexure.