Valve for injecting fuel

Abstract

A valve for injecting fuel, including a valve positioning element, an armature connected to the valve positioning element, a stop that limits a movement of the armature, and a damping element provided between the armature and the stop, the damping element being applied as a damping layer on at least one part of the armature and/or on at least one part of the stop.

Claims

1. A valve for injecting fuel, comprising: a valve positioning element; a pot-shaped armature connected to the valve positioning element, the pot-shaped armature having a base surface and a circumferential edge, wherein the circumferential edge is orthogonal to the base surface and is situated on an outermost circumference of the pot-shaped armature; a stop that limits a movement of the pot-shaped armature; and a damping element situated between the pot-shaped armature and the stop, wherein the damping element is applied as a damping layer at least one of: i) on at least one part of the pot-shaped armature and, ii) on at least one part of the stop, and wherein the damping element is applied to the base surface and an orthogonal surface of the circumferential edge of the pot-shaped armature.

2. The valve as recited in claim 1, wherein the pot-shaped armature includes an armature body made of a soft magnetic material.

3. The valve as recited in claim 1, wherein the damping layer has a thickness of 20 μm.

4. The valve as recited in claim 1, wherein the pot-shaped armature has a through-flow opening for a passage of fuel.

5. The valve as recited in claim 1, wherein the damping layer is applied on at least one part of the pot-shaped armature.

6. The valve as recited in claim 1, wherein the damping layer is applied on at least one part of the stop.

7. The valve as recited in claim 1, wherein the damping layer is applied on at least one part of the pot-shaped armature and on at least one part of the stop.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, a plurality of exemplary embodiments of the present invention are described in detail with reference to the figures.

(2) FIG. 1 shows a schematic sectional view of a valve according to a first exemplary embodiment of the present invention.

(3) FIG. 2 shows a schematic sectional view of a valve according to a second exemplary embodiment of the present invention.

(4) FIG. 3 shows a schematic sectional view of a valve according to a third exemplary embodiment of the present invention.

(5) FIG. 4 shows a schematic sectional view of a valve according to a fourth exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

(6) FIG. 1 shows a sectional view of a magnetic valve 1 according to a first exemplary embodiment for injecting fuel;

(7) the valve is not shown completely, but only schematically. The valve includes a valve needle 2 as adjustment element and an armature 3 connected to the valve needle. In this way, valve needle 2 moves together with armature 3. In addition, on a housing 7 there is provided a stop 6 that limits a path of armature 3. A resetting of armature 3 takes place using a reset element 8. The valve is a magnetic valve, and further includes a coil 9 that, when current flows through it, moves armature 3 towards stop 6 in the direction of arrow A, thus opening the valve.

(8) As can be seen in FIG. 1, armature 3 has an armature body 4 fashioned as a disk. On the side of armature body 4 oriented toward stop 6, there is applied a damping element 5 in the form of a damping layer. Here, the damping layer has a thickness of approximately 20 μm, and is shown in exaggerated fashion in FIG. 1 for reasons of clarity. The dampening layer is made of a nonmagnetic material, preferably plastic, or a rubber material. When armature 3 moves in the direction of arrow A, armature 3 thus strikes stop 6 with the damping layer. The damping layer accomplishes a damping of the impact impulse on stop 6, and in addition also accomplishes a damping of a transmission of noise. Because armature body 4 is a disk, a mass of the armature is also reduced, so that a reduced impact impulse at stop 6 also results.

(9) In armature 3, there is also provided a through-opening 11 for a passage of fuel from one side of the armature to the other side of the armature.

(10) Thus, according to the present invention, a chrome plating of the armature can be done without, and in addition to a lower-cost production of the armature, additional damping advantages can also be achieved.

(11) FIG. 2 shows a valve 1 according to a second exemplary embodiment of the present invention; identical or functionally identical parts have been provided with the same reference characters as in the first exemplary embodiment. As can be seen in FIG. 2, in the second exemplary embodiment damping element 5 is provided in the form of a damping layer on stop 6. Armature 3 includes only soft magnetic armature body 4. Thus, the damping layer situated on stop 6 takes over the same function as the damping layer in the first exemplary embodiment.

(12) In the third exemplary embodiment, shown in FIG. 3, in addition to damping element 5 on armature 3 there is additionally provided a second damping element 10 on stop 6. Here, both damping elements can be made of the same material, for example a rubber coating. Here it is possible in particular for the thicknesses of the first and second damping layers to be reduced in comparison to the two previous exemplary embodiments, preferably to approximately half the thicknesses in the preceding exemplary embodiments.

(13) FIG. 4 shows a valve 1 according to a fourth exemplary embodiment, in which a pot-shaped armature 13 is provided. Pot-shaped armature 13 has a disk-shaped base surface 14 and a circumferential edge 15. In this exemplary embodiment, the damping layer is provided as a coating both on disk-shaped base surface 14, on the side oriented toward stop 6, and also on the outer side of circumferential edge 15. This has advantages in particular with regard to production. It is also to be noted that it is also possible for the pot-shaped armature to be rotated by 180°, and for the damping layer to be provided in the interior of the pot-shaped armature.

(14) In each of the exemplary embodiments shown in FIGS. 1 through 4, a magnetic injector having an inwardly opening needle has been shown. However, it is to be noted that it is also possible to use the present invention with magnetic injectors that open outward.