Valve needle for a fluid injection valve
The present disclosure relates to fluid injection valves. Embodiments of the teachings thereof may include a valve needle for a fluid injection valve and a fluid injection valve. For example, a valve needle for a fluid injection valve may include: a needle shaft; and a sealing ball welded to a tip of the needle shaft. The welded joint between the sealing ball and the needle shaft comprises at least two separate weld seams extending along a perimeter of the valve needle in the form of c-shaped arcs.
1. A valve needle for a fluid injection valve, the valve needle comprising:
a needle shaft; and
a sealing ball welded to a tip of the needle shaft;
wherein a welded joint between the sealing ball and the needle shaft comprises at least two separate weld seams extending along a circular perimeter of the valve needle,
wherein each of the weld seams comprises a c-shaped arc having a uniform circular curvature extending along the circular perimeter of the valve needle in an angular range between 90 and 180 degrees, and
wherein each of the weld seams is physically distinct from each other weld seam along the circular perimeter of the valve needle, to thereby define a non-continuous weld around the circular perimeter of the valve needle.
2. A valve needle according to claim 1 , wherein the at least two separate weld seams are mirror images of each other.
3. A valve needle according to claim 1 , wherein the welded joint has a 2-fold rotational symmetry.
4. A valve needle according to claim 1 , wherein the at least two separate weld seams each comprise a semicircular C-shaped arc.
5. A valve needle according to claim 1 , wherein a cross section of each of the at least two weld seams is uniform along the circular perimeter of the valve needle.
6. A valve needle according to claim 1 , wherein the at least two separate weld seams includes exactly two separate weld seams.
7. A fluid injection valve comprising:
a fluid flow inlet;
a fluid flow outlet;
a needle shaft; and
a sealing ball welded to a tip of the needle shaft and configured to seal the fluid flow outlet when in a closed position;
wherein a welded joint between the sealing ball and the needle shaft comprises at least two separate weld seams extending along a circular perimeter of the valve needle,
wherein each of the weld seams comprises a c-shaped arc having a uniform circular curvature extending along the circular perimeter of the valve needle in an angular range between 90 and 180 degrees, and
wherein each of the weld seams is physically distinct from each other weld seam along the circular perimeter of the valve needle, to thereby define a non-continuous weld around the circular perimeter of the valve needle.
8. A fluid injection valve according to claim 7 , wherein the at least two separate weld seams are mirror images of each other.
9. A fluid injection valve according to claim 7 , wherein the welded joint has a 2-fold rotational symmetry.
10. A fluid injection valve according to claim 7 , wherein the at least two separate weld seams each comprise a semicircular C-shaped arc.
11. A fluid injection valve according to claim 7 , wherein a cross section of each of the at least two weld seams is uniform along the circular perimeter of the valve needle.