METHOD FOR PRODUCING A METERING VALVE, AND METERING VALVE

Abstract

The invention relates to a method for producing a metering valve (1) for a fluid, in particular for a liquid and/or gaseous fuel, comprising a preferably plate-shaped valve seat element (2) having at least one throughflow opening (3) for the liquid and/or gaseous fuel, a lift-movable valve disk (4) that sealingly interacts with the valve seat element (2) for releasing and closing the at least one throughflow opening (3), and a stroke stop element (5) having an annular stroke stop surface (6) for limiting the stroke of the valve disk (4). According to the invention, the stroke stop element (5) is axially pretensioned in the direction of a stroke adjustment ring (7) surrounding the valve disk (4). In order to finely adjust the stroke of the valve disk (4), the axial pretensioning force is altered, whereby the stroke stop element (5) is deformed. The invention further relates to a metering valve (1) for a fluid.

Claims

1. A method for producing a metering valve (1) for a fluid, comprising a valve seat element (2) with at least one throughflow opening (3) for the fluid, a valve head (4) which can be moved with a reciprocating movement and interacts in a sealing manner with the valve seat element (2) for releasing and closing the at least one throughflow opening (3), and a stroke stop element (5) with an annular stroke stop face (6) for limiting a stroke of the valve head (4), the method comprising prestressing the stroke stop element (5) with an axial prestressing force in a direction of a stroke setting ring (7) which surrounds the valve head (4), and changing the axial prestressing force for precision setting of the stroke of the valve head (4), the stroke stop element (5) being deformed.

2. The method as claimed in claim 1, characterized in that the stroke stop element (5) is prestressed axially in the direction of the stroke setting ring (7) by the spring force of a spring (8).

3. The method as claimed in claim 1, characterized in that the axial prestressing force is introduced directly or indirectly into the stroke stop element (5).

4. The method as claimed in claim 1, characterized in that the axial prestressing force is introduced in a region (9) of the stroke stop element (5), which region (9) is arranged radially on an inside in relation to an annular supporting face (10) of the stroke stop element (5) for support on the stroke setting ring (7).

5. A metering valve (1) for a fluid, comprising a valve seat element (2) with at least one throughflow opening (3) for the fluid, a valve head (4) which can be moved with a reciprocating movement and interacts in a sealing manner with the valve seat element (2) for releasing and closing the at least one throughflow opening (3), and a stroke stop element (5) with an annular stroke stop face (6) for limiting the stroke of the valve head (4), characterized in that the stroke stop element (5) is prestressed axially in the direction of a stroke setting ring (7) which surrounds the valve head (4), and the axial prestressing force can be changed, with the result that a precision setting of the stroke of the valve head (4) can be brought about via a deformation of the stroke stop element (5).

6. The metering valve (1) as claimed in claim 5, characterized in that the stroke stop element (5) is prestressed axially in the direction of the stroke setting ring (7) by a spring force of a spring (8).

7. The metering valve (1) as claimed in claim 6, characterized in that the spring (8) is supported axially on the stroke stop element (5) directly or indirectly.

8. The metering valve (1) as claimed in claim 5, characterized in that the stroke stop element (5) has an annular supporting face (10) for axial support on the stroke setting ring (7), and a region (9) for introducing the axial prestressing force, the region (9) being arranged so as to lie radially on the inside in relation to the annular supporting face (10).

9. The metering valve (1) as claimed in claim 5, characterized in that the stroke stop element (5) is of disk-shaped or annular configuration and/or has a central recess (12).

10. The metering valve (1) as claimed in claim 5, characterized in that the valve head (4) is prestressed axially in the direction of the valve seat element (2) by way of the spring force of at least one spring (14).

11. The method as claimed in claim 1, wherein valve seat element (2) is plate-shaped.

12. The method as claimed in claim 1, characterized in that the stroke stop element (5) is prestressed axially in the direction of the stroke setting ring (7) by the spring force of a cup spring or a compression coil spring.

13. The metering valve (1) as claimed in claim 5, wherein valve seat element (2) is plate-shaped.

14. The metering valve (1) as claimed in claim 5, characterized in that the stroke stop element (5) is prestressed axially in the direction of the stroke setting ring (7) by a spring force of a cup spring or a compression coil spring.

15. The metering valve (1) as claimed in claim 6, characterized in that the spring (8) is supported axially on the stroke stop element (5) directly or indirectly, via an electromagnet (11) for actuating the metering valve (1).

16. The metering valve (1) as claimed in claim 5, characterized in that the valve head (4) is prestressed axially in the direction of the valve seat element (2) by way of the spring force of at least one compression coil spring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The method according to the invention and one preferred embodiment of a metering valve according to the invention will be described in greater detail in the following text on the basis of the appended drawings, in which:

[0029] FIG. 1 shows a diagrammatic longitudinal section through a metering valve according to the invention, and

[0030] FIG. 2 shows a greatly simplified longitudinal section through the metering valve of FIG. 1 with a deformed stroke stop element for the precision setting of the stroke of the valve head.

DETAILED DESCRIPTION

[0031] FIG. 1 shows a metering valve 1 for metering a gaseous fuel into an intake section of an internal combustion engine. The metering valve 1 which is shown has been produced in accordance with a method according to the invention which makes a precision setting of the stroke of the metering valve 1 and therefore a precise setting of the effectively released area during opening of the metering valve possible.

[0032] The metering valve 1 which is shown comprises a hollow-cylindrical first housing part 15, in which a plate-shaped valve seat element 2 with a plurality of concentrically arranged arcuate throughflow openings 3 is arranged. A valve head 4 which can be moved with a reciprocating movement and is arranged above the valve seat element 2 is provided for releasing and closing the throughflow openings 3. The valve head 4 is connected to an armature 13, with the result that the stroke of the valve head 4 can be brought about by means of an electromagnet 11 which is received in a further housing part 16 which is connected to the first housing part 15.

[0033] An annular stroke stop element 5 with an annular stroke stop face 6 which faces the valve head 4 is provided for limiting the stroke of the valve head 4. Accordingly, the two end positions of the valve head 4 are determined on one side by way of the valve seat element 2 and on the other side by way of the stroke stop element 5, the spacing between the valve seat element 2 and the stroke stop element 5 corresponding to the stroke of the valve head 4. In the present case, the spacing is predefined by way of a stroke setting ring 7, against which the stroke stop element 5 is prestressed axially by means of the spring force of a spring 8. To this end, the spring 8 which is configured as a cup spring is supported on the electromagnet 11, with the result that the axial prestressing force is introduced indirectly via the electromagnet 11 into the stroke stop element 5. The introduction of force takes place in an annular region 9 which delimits a central recess 12 of the stroke stop element 5, in which central recess 12 the armature 13 is received. The axial prestressing force leads to a deformation of the stroke stop element 5, which deformation is shown in FIG. 2 in a greatly simplified or exaggerated manner. By way of the deformation, the annular stroke stop face 6 moves closer to the valve seat element 2, with the result that the spacing which defines the stroke between the stroke stop face 6 and the valve seat element 2 is decreased. Accordingly, a precision setting of the stroke of the valve head 4 can be performed by way of a change of the axial prestress of the stroke stop element 5. The axial prestressing force corresponds to the spring force of the spring 8 or the prestressing force of the spring 8, which force is denoted by F in FIG. 2 and acts on the stroke stop element 5 via the electromagnet 11.

[0034] When the electromagnet 11 is energized, a magnetic field is built up, the magnetic force of which pulls the armature 13 including the valve head 4 in the direction of the electromagnet 11, until the valve head 4 comes into contact with the annular stroke stop face 6 of the stroke stop element 5. In this position, the valve head 4 releases a defined opening cross section. When the energization of the electromagnet 11 is ended, the gas pressure forces and springs 14 in the form of compression coil springs which are arranged between the stroke stop element 5 and the valve head 4 reset the valve head 4 and the armature 13 into their starting position.