FUEL-INJECTION SYSTEM AND ASSEMBLY THEREFOR

Abstract

An assembly for fuel-injection systems for connecting a fuel injector to a fuel-conveying component includes a retaining part that is used for mechanical fastening, and an attachment part, to which the fuel injector is hydraulically connectable. A connecting part is provided via which the attachment part, that is connectable to the fuel-conveying component, is connectable to the retaining part.

Claims

1-11. (canceled)

12. An assembly for a fuel-injection system for connecting a fuel injector to a fuel-conveying component, comprising: a retaining part for mechanical fastening; an attachment part to which the fuel injector is hydraulically connectable; and a connecting part via which the attachment part, that is connectable to the fuel-conveying component, is connectable to the retaining part.

13. An assembly as recited in claim 12, wherein the attachment part is directly fastenable to the fuel-conveying component.

14. The assembly as recited in claim 12, wherein the retaining part is directly fastenable to the fuel-conveying component.

15. The assembly as recited in claim 12, wherein the retaining part is not connected directly to the fuel-conveying component, the regarding part is connected to the fuel-conveying component via at least the connecting part and the attachment part.

16. The assembly as recited in claim 12, wherein the retaining part is made of a rotationally symmetric bar material.

17. The assembly as recited in claim 12, wherein the connecting part is configured as a one-piece formed part.

18. The assembly as recited in claim 12, wherein the connecting part is formed as a multipiece connecting part.

19. The assembly as recited in claim 12, wherein the connecting part is formed from at least one sheet-metal section.

20. A fuel-injection system for internal combustion engines, comprising: at least one assembly for connecting a fuel injector to a fuel-conveying component, including: a retaining part for mechanical fastening; an attachment part to which the fuel injector is hydraulically connectable, and a connecting part via which the attachment part, that is connectable to the fuel-conveying component, is connectable to the retaining part, wherein the attachment part is at least indirectly connected to the fuel-conveying component, and the retaining part is connected to the attachment part via the connecting part.

21. The fuel-injection system as recited in claim 20, wherein the connecting part is not directly connected to the fuel-conveying component.

22. The fuel-injection system as recited in claim 20, wherein the connecting part does not contact the fuel-conveying component.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Preferred exemplary embodiments of the present invention are described in greater detail below with reference to the figures in which corresponding elements are provided with identical reference numerals.

[0024] FIG. 1 schematically shows a partial view of a fuel-injection system having an assembly in accordance with a first exemplary embodiment of the present invention.

[0025] FIG. 2 shows the fuel-injection system illustrated in FIG. 1 in accordance with a second exemplary embodiment of the present invention.

[0026] FIG. 3 shows the fuel-injection system illustrated in FIG. 2 in accordance with the second exemplary embodiment of the present invention, from the direction of view indicated by III.

[0027] FIG. 4 shows a connecting part in a three-dimensional view in accordance with a possible embodiment of the present invention.

[0028] FIG. 5 schematically shows a partial, schematic view in accordance with a third exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

[0029] FIG. 1 schematically shows a partial view of a fuel-injection system 1 having an assembly 2 in accordance with a first exemplary embodiment of the present invention. Fuel-injection system 1 may be used in particular for high-pressure fuel injection in internal combustion engines. Fuel-injection system 1 may especially be used in mixture-compressing, spark-ignition internal combustion engines. Assembly 2 is especially suited for such a fuel-injection system 1.

[0030] In this exemplary embodiment, fuel-injection system 1 has a fuel-conveying component 3 which includes a tubular main body 4. Via at least one pump 5, fuel may be delivered from a tank 60 at a high pressure into fuel-conveying component 3. Assembly 2 is used for hydraulically and mechanically connecting a fuel injector (not shown) to fuel-conveying component 3. In the illustrated or at least in a modified embodiment, assembly 2 may be provided once or repeatedly on fuel-conveying component 3 in order to connect a corresponding number of fuel injectors to component 3.

[0031] In this exemplary embodiment, tubular main body 4 of fuel-conveying component 3 has a longitudinal axis 6. Assembly 2 has a retaining part 7, an attachment part 8, and a connecting part 9. An axis 7 of retaining part 7 does not intersect longitudinal axis 6; however, projected into the illustrated drawing plane, longitudinal axis 6 and axis 7 intersect at an angle defined here as equaling 90. Furthermore, axis 8 of attachment part 8 and longitudinal axis 6 do not intersect; however, projected into the illustrated drawing plane, these intersecting at an angle of 90.

[0032] Attachment part 8 is in the form of a cup 8. Retaining part 7 is fabricated of a tubular base material. Connecting part 9 is preferably made of a reshaped sheet metal piece. In this case, a planar connection 10 is provided between connecting part 9 and retaining part 7, it being possible for a material-to-material bond, in particular a brazed connection to be provided at suitable locations, respectively in suitable regions. In addition, a planar connection 11 is provided between connecting part 9 and a top side 12 of attachment part 8. Material-to-material bonds, in particular brazed connections may likewise be configured in some sites or regions.

[0033] Attachment part 8 is directly connected to tubular main body 4, for example, by brazing. In this case, a pressure-tight connection is ensured, to render possible a fuel inflow into an interior space of attachment part 8 formed as a cup 8 when the fuel injector having a connecting pipe is inserted along axis 8 into attachment part 8.

[0034] Connecting part 9 is neither connected to tubular main body 4 nor is it in contact therewith.

[0035] Retaining part 7 is used, in particular, for fastening to a cylinder head, a screw or a different fastening means being guided along axis 7 of retaining part 7. Retaining part 7 may be directly connected to tubular main body 4, for example, by brazing. However, a modified embodiment is also conceivable where retaining part 7 is not connected in a material-to-material bond to tubular main body 4 and either contacts or does not contact the same. The mechanical connection may then be at least essentially realized via connecting part 9 and attachment part 8, in order to indirectly connect retaining part 7 to tubular main body 4.

[0036] Thus, the fuel injector is hydraulically connectable to attachment part 8. Retaining part 7 is used for mechanical fastening. When retaining part 7 is connected in the assembled state, for example, to a cylinder head of an internal combustion engine, then the fuel injector inserted into attachment part 8 is mechanically fastened in this manner. This is because the fuel injector is then fastened between attachment part 8 and the cylinder head.

[0037] FIG. 2 shows fuel-injection system 1 illustrated in FIG. 1 in accordance with a second exemplary embodiment. In this exemplary embodiment, attachment part 8 of assembly 2 is composed of a cup 15 and of an extension 16. Here, a rotationally symmetric embodiment is selected both for retaining part 7, as well as for attachment part 8.

[0038] Correspondingly, it is also possible to realize a rotationally symmetric embodiment for retaining part 7 and attachment part 8 of assembly 2 of the first exemplary embodiment.

[0039] FIG. 3 shows fuel-injection system 1 illustrated in FIG. 2 in accordance with the second exemplary embodiment from the direction of view indicated by III. Configured on connecting part 9 is, in particular a region 17 where connecting part 9 is curved in order to optimize stress.

[0040] FIG. 4 shows a connecting part 9 in a three-dimensional view in accordance with a possible embodiment of the present invention. Here, connecting part 9 has a curved configuration to render possible connection 10 with retaining part 7. Depending on the form of top side 12 of attachment part 8, connecting part 9 may have a planar or curved shape to render possible connection 11.

[0041] FIG. 5 schematically shows a partial view of a fuel-injection system 1 in accordance with a third exemplary embodiment. In this exemplary embodiment, connecting part 9 configured as a cup 9 is indirectly connected to tubular main body 4 of fuel-conveying component 3. Here, an intermediate piece 18 is provided in which a fuel channel 21 is realized that is formed by bores 19, 20 that are cut together. During operation, fuel may be conveyed to cup 9 via fuel channel 21. Connecting part 9 is suitably connected to intermediate piece 18. Attachment part 8 is thereby connected via intermediate piece 18 to connecting part 9.

[0042] A direct connection of connecting part 9 is preferably provided, on the one hand, to attachment part 8 and, on the other hand, to retaining part 7, as is described with reference to FIG. 1 through 4. However, in a modified embodiment, an indirect connection is also possible, as is also described, for example, with reference to FIG. 5.

[0043] The present invention is not limited to the exemplary embodiments described herein.