Glow plug having a multi-part sheath of adjustable length
AssigneeRobert Bosch GmbH
InventorsJohannes Locher, Werner Teschner, Jorg-Chr. Nissen
Life of this patent
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Abstract
A sheathed-element glow plug for placement in the combustion chamber of an air-compressing internal combustion engine includes a sheath, a connector element for the glow current, and a tube secured in the sheath sealed at its end facing away from the sheath. A wire filament arrangement is embedded in insulating material within the part of the tube which protrudes from the sheath. The tube functions as a glow pencil. The sheath is manufactured using a first part, a second part, and an intermediate piece. The length of the intermediate piece is adjusted depending on the desired length of the sheathed-element glow plug.
Claims4
A sheathed element glow plug, comprising:
- a sheath having a first part and a second part;
- a connector element for a glow current secured within the sheath;
- a threaded bolt contacting the connector element and having a length dependent on a required overall length of the sheathed element glow plug;
- a tube attached to the sheath, the tube having a sealed end facing away from the sheath;
- and
- a wire filament arrangement in an insulating material disposed in a portion of the tube that protrudes from the sheath.
A sheathed element glow plug, comprising:
- a sheath having a first part, a second part, and an intermediate piece, the second part having a threaded part and a hexagonal part, the threaded part for fastening via screwing-in, the intermediate piece having a length dependent on a required overall length of the sheathed element glow plug, the intermediate piece being attached to the first part and the second part;
- a connector element for a glow current connected to the sheath;
- a tube attached to the sheath, the tube having a sealed end facing away from the sheath;
- and
- a wire filament arrangement in an insulating material disposed in a portion of the tube that protrudes from the sheath.
Dependencies are inferred from the claim text.