Inventors:
Daniel U. Johnston - Anderson IN
George A. Shinkle - Anderson IN
Assignee:
General Motors Corporation - Detroit MI
International Classification:
G01L 2322
Abstract:
A piezoelectric knock sensor has a case comprising a mounting stud, flexing plate and cover. The flexing plate has a surface provided with a plurality of raised radial ridges. A piezoelectric disk is affixed to the surface with an adhesive and abuts the ridges for improved strain transmission and reliable electrical ground contact. A spring contact further biases the disk against the ridges during assembly bonding of the adhesive; and excess adhesive can flow radially outward between the ridges.