Patent ID: 9304059
Filing Date: 2016-04-05
CPC Classification: G01L,G01M

Claim Text:
1. A spark plug assembly, comprising: a generally annular ceramic insulator having an annular surface extending between an upper mast portion and a lower distal end, said annular surface transitioning via a shoulder to a reduced diameter nose portion; a metal annular outer shell surrounding at least a portion of said ceramic insulator, said outer shell having a radially outwardly extending flange; a ground electrode operatively attached to said outer shell; a center electrode received in said ceramic insulator, said center electrode extending between an upper terminal end and a lower firing end, said lower firing end extending out of said nose portion of said insulator, said lower firing end of said center electrode and said ground electrode providing a spark gap; a force sensor disposed about said insulator; an annular inner shell received between said outer shell and said insulator, said inner shell having a first surface configured to confront said shoulder of said insulator along an axial direction; and said inner shell extending from an upper end to a lower end, said inner shell having a radially outwardly extending shoulder between said upper end and said lower end being fixed to said flange of said outer shell and the remaining portion of said inner shell remaining spaced from said outer shell.