Patent ID: 7228730
Filing Date: 2007-06-12
Classification: F02P,F23Q

Abstract:
1. A pressure-measuring glow plug for a diesel engine, comprising: a plug body for insertion into a cylinder of a diesel engine, a heating rod which is displaceably arranged in the plug body so as to be slidable in an axial direction relative to the plug body, and a pressure sensor which is arranged between the heating rod and the plug body under an initial tension, and in such a way that the pressure sensor is acted upon, in use, by the pressure prevailing in the combustion chamber of the cylinder, whereby the heating rod transmits the pressure in the combustion chamber of the cylinder to the pressure sensor due to the pressure in the combustion chamber leading to an axial motion of the heating rod relative to the plug body so as to apply a force to the pressure sensor, wherein an airtight seal is form by a bellows-shaped component that is provided between the displacable heating rod and the plug body.