SEAT PLATE FOR AN INJECTOR

Abstract

The present invention relates to a seat plate for an injector, comprising: a planar main body having a first flat side and a second flat side; a passage, which extends through the planar main body from the first flat side to the second flat side; and an indentation region in the first flat side, which indentation region surrounds an opening of the passage. The seat plate is characterised in that a plurality of webs are formed in the first flat side through the indentation region, the ratio of length to width of each web lying in the range of 2.5-3.5:1, preferably in the range from 2.7-3.3:1, more preferably in the range from 2.9-3.1:1.

Claims

1. A seat plate for an injector comprising: a plate-like base body having a first planar side and a second planar side; a passage that extends through the plate-like base body from the first planar side toward the second planar side; and a recess region in the first planar side that surrounds an opening of the passage, wherein a plurality of webs are formed in the first planar side by the recess region, with a ratio of length to width of each web being in the range from 2.5-3.5:1.

2. The seat plate in accordance with claim 1, wherein respective longitudinal directions of the webs are aligned with the opening of the passage.

3. The seat plate in accordance with claim 1, wherein the recess region is arranged spaced apart from the opening of the passage and has the same distance from the opening of the passage.

4. The seat plate in accordance with claim 1, wherein the seat plate is arranged rotationally symmetrically with a rotation of 120°.

5. The seat plate in accordance with claim 1, wherein the recess region circularly surrounds the opening of the passage and only the plurality of webs interrupt the recess region from an outer margin of the recess region toward the opening.

6. The seat plate in accordance with claim 5, wherein a center of the circular recess region is aligned with the opening of the passage.

7. The seat plate in accordance with claim 1, wherein the recess region has an inner margin that surrounds the opening of the passage and whose wall extending toward the first planar side has an inclination.

8. The seat plate in accordance with claim 7, wherein the wall has an angle of inclination in the range from 2.5-7.5°, that differs from the perpendicular on the first planar side.

9. The seat plate in accordance with claim 1, wherein the first planar side and the second planar side have a contact surface with a plane in parallel with a respective planar side whose areas are of equal size or differ from one another by less than 7%.

10. The seat plate in accordance with claim 9, wherein the first planar side and/or the second planar side has/have an angled surface in a transition to an outer periphery whose machining brings about an achieving of a desired contact area size of the respective planar side.

11. The seat plate in accordance with claim 1, wherein the passage flares from a location of a minimal diameter, toward the second planar side and in so doing substantially has the shape of a truncated cone or of a cylinder.

12. The seat plate in accordance with claim 10, wherein the outer periphery of the seat plate is circular and has one or more flat portions.

13. The seat plate in accordance with claim 1, wherein an outer periphery of the seat plate is circular and has one or more flat portions, and wherein a proportion of the flat portions amounts to at least 30% of an original circular form of the outer periphery.

14. The seat plate in accordance with claim 12, wherein the plurality of flat portions are distributed equidistantly from one another at the outer periphery.

15. An injector for injecting fuel having the seat plate in accordance with claim 1.

Description

[0038] Further advantages, modifications, and details will be explained with reference to the following description of the Figures.

[0039] There are shown:

[0040] FIG. 1: a cross-sectional view of a seat plate in accordance with the invention;

[0041] FIG. 2: a plan view of the seat plate in accordance with the invention;

[0042] FIG. 3: a cross-sectional view of a seat plate in accordance with the invention with an inclined margin of the recess region;

[0043] FIG. 4: a plan view of the seat plate in accordance with the invention with a closure element placed on it;

[0044] FIG. 5: a further plan view of the seat plate in accordance with the invention with a closure element placed thereon;

[0045] FIG. 6: a cross-sectional view of a seat body in accordance with the invention with a cylindrical control space;

[0046] FIG. 7: a plan view of a lower side of the seat plate;

[0047] FIG. 8: a plan view of the seat plate in accordance with the invention;

[0048] FIG. 9: a plan view of a further embodiment of the seat plate; and

[0049] FIG. 10: a plan view of a further embodiment of the seat plate.

[0050] FIG. 1 shows the seat plate 1 in a cross-sectional view. The approximately plate-shaped base body 2 has an upper planar side 3 and a lower planar side 4. The end faces of the plate-like base body 2 connect the upper and lower planar sides 3, 4 of the base body 2 to one another. It can be recognized that the seat plate 1 has a passage 5 that connects the first planar side 3 to the second planar side 4. This passage extends through the base body 2 of the seat plate 1. Starting from the second planar side 4, the passage 5 has a control space that has the shape of a truncated cone in the illustration; at its acute end the frustoconical control space merges into a restrictor 5 that designates a region of minimal diameter of the passage 5. The passage flares a little toward the first planar side 3 and then merges into an opening 51 in the first planar side 3.

[0051] It can further be recognized that the opening 51 is surrounded by a recess zone 6 that is, however, spaced apart from the opening 51.

[0052] FIG. 2 shows a plan view of the first planar side 3 of the seat plate 1. The opening 51 that is surrounded by the recess region 6 by the same distance is arranged centrally in the seat plate 1. The region that is adjacent to the opening and that extends from the opening 51 up to the margin 62 of the recess zone 6 is also called a sealing island.

[0053] The recess region 6 is substantially circular, but has inwardly directed webs 7 that represent elements exempted from the recess region 6 from its outer margin 61 toward the opening 51. In the present case, the three webs 7 are spaced apart from one another at a respective distance of 120°. The webs 7 serve as a support for a closure element, typically also called an armature element, that is placed onto the opening 51 to be closed. To avoid a tilting of this element, a part of the closure element is also seated on the respective sections of the webs 7 directed toward the opening 51.

[0054] FIG. 3 is a cross-sectional view of a modified seat plate 1. Unlike FIG. 1, the marginal region 62 of the recess region 6 now no longer extends perpendicular upwardly to the sealing island, but rather has an angle of inclination. In the illustration, the angle of inclination amounts to 7.5° so that the angular value shown of 15° results on a measurement of the angle between oppositely disposed marginal regions.

[0055] The inclination is of advantage since otherwise chips occur at the edge 62, that are to be avoided, due to the repeated placement of the closure element on the sealing island. The likelihood of a chip is reduced by the inclination of the margins 62 of the recess region toward the sealing island.

[0056] FIG. 4 shows a plan view of the first planar side 3 of the seat plate 9, with the closure element 9 also being shown. It can be recognized that the closure element 9 also strikes the webs when it is moved into its position closing the opening 51.

[0057] A flat portion that interrupts the actually circular shape of the outer periphery 8 can be recognized at the outer periphery 8 of the seat plate 1. These flat portions extend in a straight line and are typically arranged equidistantly from one another along the outer periphery. The segments of the circular shape of the outer periphery 8 are located between the flat portions 81 of the outer periphery 8. These segments serve a holding in a circular housing into which the seat plate 1 is placed.

[0058] FIG. 5 likewise shows a schematic plan view of the seat plate 1. A surface 83 can be recognized here in the transition region to the outer periphery 8 of the first planar side 3 that is angled with respect to the first planar side 3 and that is present both at the transition to the flat portions 81 and at the remaining segments of the circular shape. This angled surface is of advantage since the support surface of the first planar side 3 is variable by machining this surface. It is thus now possible to match the support surfaces of the first planar side 3 and of the second planar side 4 to one another, whereby material removing machining processes can be carried out simultaneously at both planar sides.

[0059] FIG. 6 shows a cross-section of the seat plate 1 in which an angled surface 82 can likewise be recognized in the transition region from the second planar side 4 toward the outer periphery 8 that provides the same advantages described in the preceding paragraph

[0060] A cylindrical control space that is arranged between the restrictor 52 and the second planar side 4 can additionally be recognized.

[0061] FIG. 7 shows a plan view of the second planar side 4 of the seat plate 1. The very much larger opening of the passage 5 and the angled surfaces that are arranged in the transition from the second planar side 4 toward the outer periphery 8 can be recognized here.

[0062] FIG. 8 shows a plan view of the first planar side 3. In addition, it becomes clear on the basis of a dashed auxiliary circle that has its center at the center of the opening 51 of the passage 5 that the flat portions extend tangentially to this auxiliary circle. The contact points of the flat portions 81 with the auxiliary circle are here arranged equidistantly along the auxiliary circle.

[0063] Provision can additionally be made that the webs 7 in the recess region 6 extend radially inwardly offset toward the opening 51 starting from the contact point.

[0064] FIG. 9 shows a plan view of a further embodiment of the seat plate 1. Unlike the preceding seat plates 1, the seat plate 1 shown in FIG. 9 now has a total of six flat portions 81

[0065] FIG. 10 shows a plan view of a further embodiment of the seat plate 1. Unlike the preceding seat plates 1, the outer periphery 8 of the seat plate 1 is circular and does not have any flat portions.

[0066] In accordance with a variation of the previously presented solution, it is possible that the seat plate is designed without the bore 61 and that the bore 52 is continuous.