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. 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, wherein the attachment part includes a cup; and a connecting part via which the attachment part, that is connectable to the fuel-conveying component, is connectable to the retaining part, the connecting part including a first, vertical portion connectable to the retaining part, and a second, horizontal portion connectable to the attachment part, wherein a bottom surface of the second, horizontal portion of the connecting part is connectable to a top surface of the cup.

2. An assembly as recited in claim 1, wherein the attachment part is directly fastenable to the fuel-conveying component.

3. The assembly as recited in claim 1, wherein the retaining part is directly fastenable to the fuel-conveying component.

4. The assembly as recited in claim 1, wherein the retaining part is not connected directly to the fuel-conveying component, the retaining part being connected to the fuel-conveying component via at least the connecting part and the attachment part.

5. The assembly as recited in claim 1, wherein the retaining part is made of a rotationally symmetric bar material.

6. The assembly as recited in claim 1, wherein the connecting part is configured as a one-piece formed part.

7. The assembly as recited in claim 1, wherein the connecting part is formed as a multipiece connecting part.

8. The assembly as recited in claim 1, wherein the connecting part is formed from at least one sheet-metal section.

9. 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, wherein the attachment part includes a cup, and a connecting part via which the attachment part, that is connectable to the fuel-conveying component, is connectable to the retaining part, the connecting part including a first, vertical portion connectable to the retaining part, and a second, horizontal portion connectable to the attachment part, wherein a bottom surface of the second, horizontal portion of the connecting part is connectable to a top surface of the cup, 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.

10. The fuel-injection system as recited in claim 9, wherein the connecting part is not directly connected to the fuel-conveying component.

11. The fuel-injection system as recited in claim 9, wherein the connecting part does not contact the fuel-conveying component.

12. The fuel-injection system as recited in claim 9, wherein the connecting part includes a third, curved portion connecting the first, vertical portion to the second, horizontal portion.

13. The fuel-injection system as recited in claim 9, wherein the first, vertical portion is planar.

14. The fuel-injection system as recited in claim 9, wherein the second, horizontal portion is planar.

15. The fuel-injection system as recited in claim 9, wherein the bottom surface of the second, horizontal portion is curved.

16. The assembly as recited in claim 1, wherein the connecting part includes a third, curved portion connecting the first, vertical portion to the second, horizontal portion.

17. The assembly as recited in claim 1, wherein the first, vertical portion is planar.

18. The assembly as recited in claim 1, wherein the second, horizontal portion is planar.

19. The assembly as recited in claim 1, wherein the bottom surface of the second, horizontal portion is curved.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) 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.

(2) 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.

(3) FIG. 2 shows the fuel-injection system illustrated in FIG. 1 in accordance with a second exemplary embodiment of the present invention.

(4) 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.

(5) FIG. 4 shows a connecting part in a three-dimensional view in accordance with a possible embodiment of the present invention.

(6) FIG. 5 schematically shows a partial, schematic view in accordance with a third exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

(7) 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.

(8) 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.

(9) 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.

(10) 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.

(11) 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.

(12) Connecting part 9 is neither connected to tubular main body 4 nor is it in contact therewith.

(13) 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.

(14) 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.

(15) 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.

(16) 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.

(17) 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.

(18) 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.

(19) 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.

(20) 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.

(21) The present invention is not limited to the exemplary embodiments described herein.