METHOD FOR PRODUCING A NOZZLE

Abstract

The invention relates to a method for producing a nozzle, in which an injection orifice of the nozzle for dispensing fuel is produced by means of laser drilling, and a cavity is formed in the nozzle along the longitudinal expansion thereof. The method is characterised in that the cavity formed in the injector is produced after the injection orifice has been produced.

Claims

1. A method of producing a nozzle wherein in said method: an orifice of the nozzle for discharging fuel is produced by means of laser drilling; and a hole hollowing out the nozzle along its longitudinal extent is produced, wherein the hole hollowing out the injector nozzle is produced after the production of the orifice.

2. The method of claim 1, wherein the hole hollowing out the nozzle comprises or is a blind hole of the nozzle.

3. The method of claim 2, wherein the hole hollowing out the nozzle is configured to receive either or both of a nozzle needle and a nozzle needle tip.

4. The method of claim 3, wherein the hole hollowing out the nozzle is produced by means of a bore.

5. The method of claim 4, wherein the orifice produced by means of laser drilling comprises a drilling wall and a drilling base and the drilling base of the orifice is removed by the production of the hole hollowing out the nozzle.

6. The method of claim 5, wherein the nozzle is a nozzle for injecting fuel.

7. The method of claim 6, wherein a plurality of orifices are produced by means of laser drilling before the production of the hole hollowing out the nozzle.

8. The method claim 7, wherein the plurality of drilling bases of the respective orifices are removed by the production of the hole hollowing out the nozzle.

9. The method of claim 8, wherein a drilling axis of the orifice includes an angle with a normal plane of the longitudinal extent of the nozzle that does not exceed 65°.

10. A nozzle for injecting fuel that has been produced in accordance with the method of claim 1.

11. A nozzle for injecting fuel that has been produced in accordance with the method of claim 9.

12. The method of claim 1, wherein the hole hollowing out the nozzle is a blind hole of the nozzle.

13. The method of claim 4, wherein the bore is a conventional bore.

14. The method of claim 6, wherein the nozzle is a nozzle for injecting diesel.

15. The method of claim 9, wherein the plane of the longitudinal extent of the nozzle does not exceed 35°.

16. The method of claim 9, wherein the plane of the longitudinal extent of the nozzle does not exceed 20°.

Description

[0029] Further details, features, and advantages of the invention will be explained with reference to the following description of the Figures. There are shown:

[0030] FIG. 1: a sectional view of a nozzle tip during a production method in accordance with the prior art;

[0031] FIG. 2: a sectional view of a nozzle tip during a first production step in accordance with the present invention; and

[0032] FIG. 3: a sectional view of a nozzle tip during a further production step in accordance with the present invention subsequent to the first production step.

[0033] FIG. 1 shows a sectional view of a tip of a nozzle 1 for injecting fuel.

[0034] As already explained in the introductory part of the description, it is customary in accordance with the prior art to drill the orifice 2 with the aid of a laser 4. The oppositely disposed region 31 of the blind hole 3 can be damaged in this process after the laser beam 41 has passed through. This damage is graphically shown by a lightning symbol. Such damage must be avoided at all costs since otherwise the injector becomes unusable. An approximately funnel-shaped region 32 that expands upwardly away from the tip of the nozzle adjoins the blind hole 3 here. This region can also have a cylindrical shape. It is the seat region 33 of the nozzle needle that, in interaction with the nozzle needle, can interrupt or permit a fluid communication of highly compressed fuel (and thus the discharge of fuel through the nozzle).

[0035] FIG. 2 shows a first step for producing a nozzle 1 in accordance with the invention. In this respect, the at least one orifice 2 is produced by laser drilling in the nozzle blank or in a nozzle whose blind hole and/or seat surface has not yet been produced. The hole produced by the laser 4 has a drilling wall 21 and a drilling base 22. The drilling base 22 is here the region to be removed by the laser beam 41.

[0036] FIG. 3 shows a production step that follows the production of the at least one orifice 2. The blind hole 3 of the nozzle 1 Is produced with the aid of a drill 5 in this process. The bore effected by means of a laser 4 in the preceding step is shown by a dashed line, said bore having been partially removed by the blind hole production in a section running toward the drilling base 22.

[0037] No measures have to be taken to protect the side 31 of the blind hole 3 disposed opposite the laser from an unwanted action of the laser 4 since the blind hole 3 is only drilled after the laser drilling of the orifice 2.