Engine vibration sensor

Details Engine vibration sensor Engine vibration sensor

1982-05-26

1985-01-22

Gill, James J.

Measuring and testing

Vibration

Sensing apparatus

73654, 73 35, G01L 2322, G01H 108

Patent

active

044944098

ABSTRACT:
An engine vibration sensor for detecting the engine vibration as an electric signal including a vibrator set to resonate at a specific frequency of vibration of an engine to which it is attached, the vibrator being composed of at least one piezoelectric plate and having a root and a vibrator element; means for increasing the cross-sectional area of the vibrator element to make the second moment of area of the root of the vibrator relatively larger than that of the vibrator element; a base to be connected to an engine body; and a clamp for retaining the root firmly between the clamp and the base. The clamp may be provided with a projection having a flat surface for retaining the root of the vibrator. This construction prevents a change in the effective length of the vibrator element, thereby stabilizing the characteristics of the resonant frequency of the vibrator.

REFERENCES:
patent: 2300638 (1942-11-01), Wente
patent: 3370187 (1968-02-01), Straube
patent: 4140936 (1979-02-01), Bullock
patent: 4250757 (1981-02-01), Hanson
patent: 4275586 (1981-06-01), Gast
patent: 4279159 (1981-07-01), Powell et al.
patent: 4305298 (1981-12-01), Greenwood
patent: 4348905 (1982-09-01), Nishimura et al.
patent: 4374472 (1983-02-01), Nishimura
patent: 4379403 (1983-04-01), Hattori et al.

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