Patent ID: 6538366
Filing Date: 2003-03-25
Classification: G01L

Abstract:
A sparking plug for a combustion engine, comprising:a metal shell with an externally threaded end part for screwing into a tapped hole in a cylinder head; an insulating body inside and supported by said shell; a central electrode passing through said insulating body for connection to a high tension; an annular chamber being delimited by an internal surface of the shell, in the region of the threaded end part, and an exterior surface of an end of the insulating body; at least one pressure sensor (C), said sparking plug subjecting said pressure sensor to a pressure of an associated combustion chamber when the sparking plug is in place, the pressure sensor (C) being installed in the threaded end part of the shell delimiting the annular chamber, radially outward from the internal surface of the threaded end part such that a geometry of the annular chamber is not altered by the presence of the sensor, wherein the threaded end part of the shell comprises a recess for accommodating a barrel section having an internal cylindrical surface that is aligned with an upper part of the internal surface of the threaded end part of the shell so that the barrel section reproduces the geometry of the annular chamber, said internal cylindrical surface extending to an end of the annular chamber adjacent to the combustion chamber.