Heater plug for diesel engines
AssigneeW. C. Heraeus GmbH
InventorsFranz Sperner, Fritz Aldinger, Wilhelm Zwergel
Life of this patent
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Abstract
A heater plug comprising a heater coil connected to a terminal pin, said terminal pin maintained in gas-tight manner at least in part within and insulated from a plug shell, at least the surface of said heater coil formed by a metal or a base alloy of a metal of the platinum group said heater coil supported by heat electrically insulating rod-like or tubular supporting body heater coil surrounded by a protective tube. The heater plug is useful as a starting aid for diesel engines and other internal combustion engines, especially those without spark ignitions.
Claims33
In a diesel engine having a zone for heating or reheating a fuel or air or a mixture thereof, said zone having a heater plug, said heater plug employed as a reheating cold-starting aid for said fuel or air or a mixture thereof, the improvement wherein said heater plug comprises an electrically conductive heater coil connected to an electrically conductive terminal pin, said terminal pin maintained in gas-type manner at least in part within and insulated from an electrically conductive plug shell, at least the surface of said heater coil formed of a metal of the platinum group, said heater coil supported by a heat resistant electrically insulating rod-like supporting body attached to said terminal pin, said heater coil being surrounded by a heat-resistant electrically conductive protective tube made of a metal and electrically connected at its other end to the end of said electrically conductive protective tube, said protective tube having openings over its circumference of number and size sufficient to permit fuel and air to pass to said heater coil, said protective tube having an opening at one end, said electrically conductive heater coil being electrically insulated along said protective tube, except for the terminal connecting portion.
In a diesel engine having a zone for heating or reheating a fuel or air or a mixture thereof, said zone having a heater plug, said heater plug employed as a heating cold starting aid for said fuel or air or a mixture thereof, the improvement wherein said heater plug comprises an electrically conductive heater coil connected to an electrically conductive terminal pin, said terminal pin maintained in gas-tight manner at least in part within and insulated from an electrically conductive plug shell, at least the surface of said heater coil formed of a metal of the platinum group, said heater coil supported by a heat-resistant, electrically insulating, tubular supporting body attached to said terminal pin, said heater coil being surrounded by a heat resistant, electrically conductive protective tube made of a metal and electrically conductive at its other end to the end of said electrically conductive protective tube, said protective tube having openings over its circumference of number and size suffficient to permit fuel and air to pass to said heater coil, said protective tube having an opening at one end, said electrically conductive heater coil being electrically insulated along said protective tube, except for the terminal connecting portion.
Dependencies are inferred from the claim text.