Patent ID: 8860291
Filing Date: 2014-10-14
Classification: G01L,H01T

Abstract:
1. A spark plug, comprising: a center electrode extending along a center axis and with a sparking surface at an end; a generally tubular insulator surrounding said center electrode and including at least one shoulder; a shell surrounding said insulator and having a turn-over on a first end, said first end being an extreme distal end of said shell, and said turn-over extending inwardly toward said center axis and along said shoulder of said insulator; said shell including a gasket flange presenting a gasket seat for engaging a gasket and presenting a barrel shoulder facing opposite said gasket seat; said shell further including a barrel extending from said barrel shoulder to said turn-over, a threaded portion, and a ground electrode; wherein said turn-over, said barrel having said outer surface and said barrel shoulder, said gasket flange, and said threaded portion of said shell are integrally formed; and a piezo sensor assembly located on said barrel shoulder between said barrel shoulder and said turn-over, said piezo sensor comprising a lower electrode contact, a piezo transducer, an upper electrode contact, an isolator, and an upper bushing which is attached to said barrel.