Device for detecting change in internal pressure of cylinder

Details Device for detecting change in internal pressure of cylinder Device for detecting change in internal pressure of cylinder

1992-04-06

1994-06-28

Myracle, Jerry W.

Measuring and testing

Vehicle drive train

Rear end

73714, G01M 1500

Patent

active

053236432

ABSTRACT:
A device for detecting a change in internal pressure of a cylinder includes a cylinder head, an ignition plug threadingly fitted into a plug insertion hole of the cylinder head. An annular piezoelectric sensor is secured in the plug insertion hole by screwing the plug into the insertion hole. The sensor has such an outer periphery that, when the ignition plug is screwed into the plug hole, a part of the outer periphery of the sensor placed is brought into engagement with an inside periphery of the plug hole and is thereby prevented from being further rotated in the screwing direction. By using a gasket having the same relative shape to the periphery of the plug insertion hole as that of the above sensor, rotation of the sensor can be prevented even when the sensor does not have such a relative shape.

REFERENCES:
patent: 4191872 (1980-03-01), Sorenson
patent: 4898024 (1990-02-01), Takeuchi

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