Federal-mogul Ignition Srl

Stefano Vignoli

Sandro Goretti

Simone Girlando

A glow plug ( ) for diesel engines that includes a threaded metal tubular body ( ) and a metal sheath ( ) carried by the tubular body. The sheath ( ) has an end portion ( ) projecting from the tubular body ( ) and is electrically insulated from the tubular body. The glow plug ( ) includes first and second electrical terminals ( ) and a heating resistor ( ) electrically connected to the first terminal ( ) and to the end portion ( ) of the sheath ( ). The first terminal ( ) has the shape of a metal rod extending through the tubular body ( ) and has an end inserted inside the sheath ( ). The heating resistor ( ) is also set inside the sheath ( ). The second terminal ( ) is electrically connected to the sheath ( ) and can be disposed either coaxially around the first terminal ( ) or coaxially within the first terminal.

Glow plug arranged for measuring the ionization current of an engine

A glow plug ( ) that includes a metal tubular body ( ), a metal sheath ( ) carried by the tubular body, a heating resistor ( ) located inside the sheath, first and second electrical terminals ( ), and a layer ( ) of insulating material applied on a portion of the outer surface of the sheath. The first terminal ( ) is electrically connected to the heating resistor ( ) and the second terminal ( ) is electrically connected to the sheath ( ). The layer ( ) of insulating material is located on the sheath ( ) between the sheath and tubular body ( ) to thereby electrically insulate the metal sheath from the metal tubular body. The layer ( ) of insulating material can be applied by plasma deposition which enables the sheath ( ) to be attached to the tubular body ( ) by an interference fit of the sheath within a cavity ( ) in the tubular portion. Also disclosed is a method of fabricating the glow plug ( ).

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Modena, Italy

Stefano Vignoli