Electromagnetically actuatable valve
AssigneeRobert Bosch GmbH
InventorsDieter Vogt, Rudolf Babitzka
Life of this patent
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Abstract
In electromagnetically actuatable valves having a core, surrounded by a magnet coil, and an armature that acts upon a valve closing body by means of a connecting tube, the connection between the connecting tube and the hard valve closing body is embodied by first providing the metallically harder closing body with a first spot weld, and after that this first spot weld is welded to the metallically softer connecting tube by means of a second spot weld, until the at least partly encompassing weld seam is formed between the valve closing body and the connecting tube, the weld seam assuring a safe and reliable connection. This embodiment of the valve is particularly well suited for injection valves of fuel injection systems.
Claims16
An electromagnetically actuatable valve, in particular an injection valve for fuel injection systems of internal combustion engines, having a core surrounded by a magnet coil, a metal valve closing body (35), an armature oriented toward the core and joined to a metal connecting tube (28), said metal connecting tube on a lower end remote from the armature is joined to said metal valve closing body by an at least partially encompassing first weld seam (39), the metal connecting tube being made of a metallically soft material and the valve closing body (35) being made by comparison of a metallically harder material, and the first weld seam (39) between the connecting tube (28) and the valve closing body (35) is effected by first and second spot welds (40, 41), such that in alternation said first spot weld (40) is applied along said harder metallic valve closing body (35) juxtaposed said lower end of said metal connecting tube (28), after which said second spot weld seam (41) is applied to said softer metallic connecting tube (28) adjoining said first spot weld, until said first and second spot welds form the at least partially encompassing first weld seam (39).
A method of securing a bottom end of a metal connecting tube (28) made of a metallically soft material to a valve closing body (35) made by comparison of a metallically harder material which comprises positioning said metal connecting tube onto said valve closing body, applying a first spot weld (40) to said valve closing body juxtaposed said bottom end of said metal connecting tube, subsequently applying a second spot weld (41) to said first spot weld (40) and to said bottom end of said metal connecting tube thereby forming a combined first weld seam (39) formed by said first and second spot welds.
Dependencies are inferred from the claim text.