Fuel injection valve and method for the production of a valve needle for a fuel injection valve
AssigneeRobert Bosch GmbH
InventorMartin Andorfer
Life of this patent
Estimating the term…
Abstract
A fuel injection valve that possesses an axially movable valve needle which includes at least one armature and one spherical valve closure element. The armature forms a closure element support which is joined at its downstream end to the valve closure element. The end of the closure element support facing toward the valve closure element is deformed in such a way that a polygonal profile is present. In accordance with the number of profile edges, at least two flowthrough openings, communicating with an inner longitudinal bore, are formed between the closure element support and the surface of the valve closure element, through which openings fuel can easily flow.
Claims14
A fuel injection valve, comprising:
- a magnet coil;
- a core at least partially surrounded by the magnet coil and having a longitudinal valve axis;
- a fixed valve seat;
- and
- an axially movable valve needle at least partially surrounded by the core and including at least one closure element support and a valve closure element, the valve closure element being immovably joined to the at least one closure element support and coacting with the fixed valve seat, and the at least one closure element support having an inner longitudinal bore extending to a surface of the valve closure element, wherein:
- an end of the at least one closure element support facing the valve closure element includes a contour that deviates from an annular profile such that at least two flowthrough openings in communication with the inner longitudinal bore are formed between the at least one closure element support and the surface of the valve closure element.
A method for manufacturing a valve needle of a fuel injection valve, comprising the steps of:
- providing a metal closure element support having:
- an inner longitudinal bore,
- a circular cross section, and
- a circular outer contour;
- providing a valve closure element;
- using at least one deformation tool to plastically deform an end of the metal closure element support that is to face toward the valve closure element such that the metal closure element support includes at the end that is to face toward the valve closure element a contour that deviates from an annular profile, the metal closure element including a plurality of corner regions and a plurality of edge regions;
- and
- subsequent to the step of using the at least one deformation tool, attaching the valve closure element to the deformed end of the metal closure element support.
Dependencies are inferred from the claim text.