Glow plug with a sleeve to receive the heating rod, equipped with a distal turned-up part

A pressure measuring glow plug for a diesel engine, the glow plug comprising:

• a heating rod having a proximal extremity with an electrical power supply connection;
• a plug body having a receiving housing receiving a proximal portion of the heating rod, the heating rod having a distal portion which extends axially, projecting beyond a distal extremity of the plug body;
• a mounting device for mounting the proximal portion of the heating rod in said receiving housing, the mounting device including a receiving sleeve made of stainless steel, fixed rigidly and impermeably around said proximal portion of the heating rod, having a tubular principal part extending axially in contact with the heating rod, and being arranged to:
• permit axial translation movements of the heating rod relative to the plug body, and
• ensure impermeability between the heating rod and the plug body, in such a way as to delimit a proximal zone of the receiving housing which is not exposed to the atmosphere of a combustion chamber of an engine which receives the glow plug;
• and
• a load sensing sleeve that extends entirely in said proximal zone of the receiving housing, the load sensing sleeve being adapted to measure pressure in a cylinder of the diesel engine,
• wherein said load sensing sleeve extends axially entirely around the proximal portion of the heating rod,
• wherein the receiving sleeve has a distal extremity portion opposite said proximal extremity of said heating rod,
• the distal extremity portion being U-shaped and turned radially outwardly and towards said proximal extremity of said heating rod, a distal face of the U-shaped distal extremity portion being adapted to be in contact with a combustion chamber of the cylinder of the diesel engine,
• the distal extremity portion being connected rigidly and impermeably to the plug body, and
• the distal extremity portion being elastically deformable in flexion and having suitable elasticity in flexion to permit the axial translation movements of the heating rod relative to the plug body while ensuring impermeability at the distal extremity of the plug body,
• wherein the tubular principal part of the receiving sleeve has a proximal extremity opposite said distal extremity portion,
• wherein said proximal extremity of the tubular principal part of the receiving sleeve comes into contact with a distal extremity of the load sensing sleeve.