Electrical connections for a piezoelectric pressure transmitter for an internal combustion engine

Claim 1

A device for providing an electrical signal corresponding to pressure in a cylinder of an internal combustion engine during normal running operating of the engine comprising piezoelectric means for providing an electrical signal in response to the application of pressure, means for mounting the piezoelectric means to be responsive to pressure in a cylinder of the engine, the mounting means including a metal body having a chamber opening at one end of the body accommodating the piezoelectric means therein, means for sealing said one body end in a well communicating with the cylinder, and diaphragm means secured over the chamber opening at said one body end to be movable in response to variations in fluid pressure in the engine cylinder to transfer forces to the piezoelectric means to provide an electrical signal corresponding to said cylinder pressure variations while shielding the piezoelectric means from an environment within the cylinder, and electronic means carried on the mounting means to amplify said initial electrical signal for transmission to a location remote from the piezoelectric means characterized in that conductor means have first contact means thereon and extend from the piezoelectric means to locate the first contact means in a selected position on the mounting means, housing means receive the electronic means thereon holding the electronic means in a selected position on the housing means, the electronic means have second contact means thereon locating and guide means are provided on the housing means and on the mounting means to cooperate to position the housing means on the mounting means with said first and second contact means engaged, to electrically interconnect the piezoelectric means and the electronic means, and means detachably attach the housing means to the mounting means to reliably retain the contact means in such engagement when subjected to engine vibrations.

Claim 2

A device for providing an electrical signal corresponding to pressure in a cylinder of an internal combustion engine during normal running operating of the engine comprising piezoelectric means for providing an electrical signal in response to the application of pressure, means for mounting the piezoelectric means to be responsive to pressure in a cylinder of the engine, the mounting means including a metal body having a chamber opening at one end of the body accommodating the piezoelectric means therein, means for sealing said one body end in a well communicating with the cylinder, and diaphragm means secured over the chamber opening at said one body end to be movable in response to variations in fluid pressure in the engine cylinder to transfer forces to the piezoelectric means to provide an electrical signal corresponding to said cylinder pressure variations while shielding the piezoelectric means from an environment within the cylinder, and electronic means carried on the mounting means to amplify said initial electrical signal for transmission to a location remote from the piezoelectric means characterized in that conductor means have first contact means thereon and extend from the piezoelectric means to locate the first contact means in a selected position on the mounting means, housing means receive the electronic means thereon holding the electronic means in a selected position on the housing means, the electronic means have second contact means thereon locating and guide means are provided on the housing means and on the mounting means to cooperate to position the housing means on the mounting means with said first and second contact means engaged, to electrically interconnect the piezoelectric means and the electronic means, and means detachably attach the housing means to the mounting means to reliably retain the contact means in such engagement when subjected to engine vibrations.