Method for applying a pin on an electrode base body
AssigneeRobert Bosch GmbH
InventorsDetlef Hartmann, Andreas Benz
Life of this patent
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Abstract
A method is described for applying a pin made of a spark-erosion-resistant material, in particular of noble metal, onto a electrode base element. In order to achieve a large pin surface exposed to spark erosion, without increased material outlay for the pin, the pin is placed with one end surface onto the electrode base element and welded to it. The welded-on pin is then, by application of a compressive force engaging at the exposed end surface of the pin and directed toward the electrode base element, upset to a larger diameter.
Claims17
A method for applying a pin made of a spark-erosion-resistant material onto an electrode base element, comprising:
- welding a first end of the pin onto an end segment of the electrode base element, the end segment projecting out of the electrode base element;
- and
- subsequent to the welding, applying a deformation force to a second end of the pin having a sole planar surface, the deformation force being directed toward the electrode base element to axially upset the pin thereby increasing a diameter of the pin.
A spark plug, comprising:
- an electrode that has an electrode base element;
- and
- a pin, made of a spark-erosion-resistant material, welded onto an end segment of the electrode base element, the end segment projecting out of the electrode base element, wherein the pin is welded with one end surface onto the electrode base element, and a second end of the pin having a sole planar surface and the pin diameter is plastically increased after the welding operation as a result of axial upsetting of the pin due to a deformation force applied at the second end of the pin having the sole planar surface.
Dependencies are inferred from the claim text.