KNOCK TRANSMITTER Russian patent published in 1999 - IPC

FIELD: test of vibration of internal combustion engines in systems suppressing combustion knock. SUBSTANCE: knock transmitter has electric insulation case with two current leads-out united by electric connector. Case houses base in the form of bushing with flange, insulation member, two current slip rings connected to current leads-out, piezoelement and metal inertial mass. Piezoelement and inertial mass are manufactured in the form of two pairs of identical ring sectors. Current slip rings in the form of semi-rings are located in one plane and are connected to opposite sectors of inertial mass. Insulation member, current slip rings, piezoelement and inertial mass are cemented in sequence on to bushing. Ring sectors of piezoelement are mounted to obtain opposite directions of their polarization vectors. Angular dimensions of ring sectors of piezoelement can lie between limits of 90 to 120 deg. EFFECT: increased noise immunity of knock transmitter against electric interference and vibrations. 1 cl, 3 dwg