Spark plugs for internal combustion engines
AssigneeG. Rau
InventorsDieter Stockel, Friedrich Schneider
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Abstract
A spark plug is equipped with a center electrode composed of two different metals, one of which is embedded in wire or fibre form in the other and wherein at least one of the metals possesses the properties of high electrical and thermal conductivity. The electrode is made by the joint plastic shaping of the two metals to produce a solid metallic bond therebetween. The electrode possesses the advantageous properties of good electrical and thermal conductivity, high corrosion resistance at high temperatures, slow burning rate and high mechanical strength.
Claims17
In an internal combustion engine spark plug of the type including a center electrode, the improvement wherein said center electrode comprises:
- a length of fibre reinforced material made up of at least two metals, a first of said metals forming a matrix and a second of said metals comprising a plurality of wires or fibres embedded in and solidly metallically bonded to said matrix, at least said fibres being made up of initially solid wires, at least one of said metals of said matrix and said fibres possessing the properties of high electrical and thermal conductivity, said fibre reinforced material being produced by the joint plastic shaping of wire-shaped initial matrix and fibre metals, with at least said initial fibre metal being in the form of said solid wires.
In a method for the production of an internal combustion engine spark plug, said method including fabricating a center electrode and installing said center electrode in a spark plug, the improvement wherein said center electrode is fabricated by the steps comprising:
- providing wire-shaped initial metal matrix and initial metal fibres in the form of solid wires, at least one of said metals of said matrix and said fibres possessing the properties of high electrical and thermal conductivity;
- bundling said matrix with said fibres distributed over the cross-section thereof;
- and
- jointly plastic shaping said matrix and said fibres to form a solid length of fibre reinforced material made up of said matrix metal having said fibre metal embedded therein and solidly metallically bonded thereto.
Dependencies are inferred from the claim text.