Transducer and holder therefor for ultrasonic acoustic tachomete

Details Transducer and holder therefor for ultrasonic acoustic tachomete Transducer and holder therefor for ultrasonic acoustic tachomete

1985-01-31

1986-03-25

Birmiel, Howard A.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

7386118, G01M 1500

Patent

active

045774960

ABSTRACT:
An engine timing apparatus includes a piezoelectric transducer and a device for mechanically coupling it to a fuel injector body of the engine. A 6-inch clamping-type pliers is clamped to the injector body. A metal housing is fastened to the pliers at the jaw pivot, the housing having a cylindrical side wall and a circular bottom wall in positive contact with the pliers. The transducer is supported in a recess in a rubber sleeve in the housing and cooperates with the housing to define a resonant chamber at substantially 40 Khz. The dimensions of the pliers are such that the ultrasonic acoustic emissions of the injector body induce in the pliers a standing wave at substantially 40 Khz or a harmonic thereof, the jaw pivot being disposed substantially at an antinode, or point of maximum displacement, of the standing wave. The housing above the transducer is filled with an acoustically insulating foam and covered with a plastic cap.

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