Valve needle for an electromagnetically actuated valve and process for manufacturing the same
AssigneeRobert Bosch GmbH
InventorsFerdinand Reiter, Werner Sefz, Ludwig Dorsch
Life of this patent
Estimating the term…
Abstract
The new valve needle comprises at least one valve-needle section and a valve-closure member section of the valve needle which are manufactured as one part by means of deep-drawing. To guarantee a flowing of the fuel in the direction of the valve seat, two beads are provided, for example, in the valve-needle section, while truncations are formed on the valve-closure member section having a hemispherical bowl shape. Thus, the fuel flows along on the outer periphery of the valve-needle section. The valve needle is especially suited for injection valves in fuel-injection systems of mixture-compressing internal combustion engines with externally supplied ignition.
Claims20
A valve needle for an electromagnetically actuated valve, the actuated valve having a core, a solenoid coil and a fixed valve seat, the valve needle comprising:
- an armature;
- a valve closure member section interacting with the fixed valve seat;
- a valve needle section connecting the armature to the valve closure member section;
- wherein the valve needle section and the valve closure member section are formed from a single blank, the single blank being formed via deep-drawing, and the valve needle section and the valve closure member section forming a single element, wherein the single element has first and second ends, the first end being open and the second end being closed, and the valve closure member section is formed at the second end.
A valve needle for an electromagnetically actuated valve, the actuated valve having a core, a solenoid coil and a fixed valve seat, the valve needle comprising:
- an armature;
- a valve closure member section interacting with the fixed valve seat;
- a valve needle section connecting the armature to the valve closure member section, the valve needle section and the valve closure member section being formed from a single blank, the single blank being formed via deep-drawing;
- and
- at least one bead molded from an outer periphery of the valve needle section at a first end of the valve needle section, the first end facing away from the valve closure member section.
A process for manufacturing a valve needle having an armature, the process comprising the steps of:
- shaping a single lank via a deep-drawing procedure to form a single element with a valve needle section and a valve closure member section, the valve closure member section having an outer periphery and the valve needle section having a first end facing away from the valve closure member section;
- placing at least one truncation on the outer periphery of the valve closure member section via at least one of an upsetting procedure and a stamping procedure;
- molding at least one bead at the first end of the valve needle section;
- surface-treating the valve closure member section;
- and
- connecting the armature and the valve needle section.
Dependencies are inferred from the claim text.