Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1979-07-02
1981-03-03
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310321, 310330, 310338, 73 35, H01L 4108
Patent
active
042543541
ABSTRACT:
A piezoelectric knock sensor comprises a flexing plate at one end of a generally cylindrical case with a mounting stud extending perpendicularly therefrom and a piezoelectric element attached to the flexing plate within the case for flexure with the flexing plate. When the sensor is attached to a component of a multicylinder, internal combustion engine, the case vibrates interactively with at least a portion of the component through the flexing plate and exhibits both an interactive resonance with the component for a wide resonance peak and response to transverse as well as axial vibrations. The sensor is thus capable of resonant response to knock-induced vibrations from all the cylinders even if the characteristic knock frequencies of the individual cylinders differ over a range too great to be encompassed by a self-resonant sensor. In addition, the sensor has the comparatively high output level of a piezoelectric device and simple construction suitable for mass production.
REFERENCES:
patent: 2808522 (1957-10-01), Dranetz
patent: 3060748 (1962-10-01), Schwartz
patent: 3120622 (1964-02-01), Dranetz et al.
patent: 3148290 (1964-09-01), Dranetz et al.
patent: 3170076 (1965-02-01), Wing
patent: 3311761 (1967-03-01), Schloss
patent: 3453457 (1969-07-01), Hayer et al.
patent: 3846650 (1974-11-01), Barrow
patent: 4015319 (1977-04-01), Levine
patent: 4161665 (1979-07-01), Buck et al.
Budd Mark O.
General Motors Corporation
Sigler Robert M.
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