Fuel injection valve
AssigneeRobert Bosch GmbH
InventorFerdinand Reiter
Life of this patent
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Abstract
A fuel injector, in particular for direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine, comprises an armature that coacts with a magnet coil, and comprises a valve needle, joined to the armature, on which is provided a valve-closure member that, together with a valve seat surface, forms a sealing seat. The valve needle has, downstream from the armature, a clamping sleeve whose axial position on the valve needle determines the height of a pre-stroke gap configured between the armature and an engaging flange that is joined nonpositively to the valve needle, the clamping sleeve being of tubular configuration and having a slit extending in the axial direction.
Claims8
A fuel injector (1), in particular for direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine, comprising an armature (20) that coacts with a magnet coil (10);
- and comprising a valve needle (3), which is in working engagement with the armature (20) and on which is provided a valve-closure member (4) that, together with a valve-seat surface (6), forms a sealing seat, an armature stop being provided on the valve needle (3) downstream from the armature (20), wherein the armature stop is configured as a clamping sleeve (31) having a slit (33) extending in the axial direction, the adjustable axial position of the clamping sleeve (31) on the valve needle (3) determining the height of a pre-stroke gap (38) configured between the armature (20) and a second armature stop (21) on the valve needle (3).
The fuel injector as defined in one of the preceding claims,
- wherein the second armature stop is configured, upstream from the armature (20), as an engaging flange joined nonpositively and directly to the valve needle (3).
Dependencies are inferred from the claim text.