Abstract: A glow plug (10) for diesel engines that includes a threaded metal tubular body (12) and a metal sheath (22) carried by the tubular body. The sheath (22) has an end portion (24) projecting from the tubular body (12) and is electrically insulated from the tubular body. The glow plug (10) includes first and second electrical terminals (30,46) and a heating resistor (34) electrically connected to the first terminal (30) and to the end portion (24) of the sheath (22). The first terminal (30) has the shape of a metal rod extending through the tubular body (12) and has an end inserted inside the sheath (22). The heating resistor (34) is also set inside the sheath (22). The second terminal (46) is electrically connected to the sheath (22) and can be disposed either coaxially around the first terminal (30) or coaxially within the first terminal.

Abstract: A glow plug (10) that includes a metal tubular body (12), a metal sheath (24) carried by the tubular body, a heating resistor (33) located inside the sheath, first and second electrical terminals (30,32), and a layer (36) of insulating material applied on a portion of the outer surface of the sheath. The first terminal (30) is electrically connected to the heating resistor (33) and the second terminal (32) is electrically connected to the sheath (24). The layer (36) of insulating material is located on the sheath (24) between the sheath and tubular body (12) to thereby electrically insulate the metal sheath from the metal tubular body. The layer (36) of insulating material can be applied by plasma deposition which enables the sheath (24) to be attached to the tubular body (12) by an interference fit of the sheath within a cavity (16) in the tubular portion. Also disclosed is a method of fabricating the glow plug (10).

Abstract: A glow plug (10) that includes a metal tubular body (12), a metal sheath (24) carried by the tubular body, a heating resistor (33) located inside the sheath, first and second electrical terminals (30,32), and a layer (36) of insulating material applied on a portion of the outer surface of the sheath. The first terminal (30) is electrically connected to the heating resistor (33) and the second terminal (32) is electrically connected to the sheath (24). The layer (36) of insulating material is located on the sheath (24) between the sheath and tubular body (12) to thereby electrically insulate the metal sheath from the metal tubular body. The layer (36) of insulating material can be applied by plasma deposition which enables the sheath (24) to be attached to the tubular body (12) by an interference fit of the sheath within a cavity (16) in the tubular portion. Also disclosed is a method of fabricating the glow plug (10).

Abstract: A glow plug (10) for diesel engines that includes a threaded metal tubular body (12) and a metal sheath (22) carried by the tubular body. The sheath (22) has an end portion (24) projecting from the tubular body (12) and is electrically insulated from the tubular body. The glow plug (10) includes first and second electrical terminals (30,46) and a heating resistor (34) electrically connected to the first terminal (30) and to the end portion (24) of the sheath (22). The first terminal (30) has the shape of a metal rod extending through the tubular body (12) and has an end inserted inside the sheath (22). The heating resistor (34) is also set inside the sheath (22). The second terminal (46) is electrically connected to the sheath (22) and can be disposed either coaxially around the first terminal (30) or coaxially within the first terminal.