Pressing device for two fuel injectors of an internal combustion engine

Abstract

The invention relates to a pressing device (1) for two fuel injectors (8) of an internal combustion engine, which is made of sheet steel, has a crossbar (2) with two vertically curved, flat side walls (3) on the outer wall side and with a bolt hole (4) for a clamping bolt (15) in the longitudinal middle, wherein the pressing device (1) is forked open at its two end portions (5) and the free lower end faces (6) of the side walls (3) at the end portions (5) act as clamping faces (7) for the fuel injectors (8), wherein the pressing device (1) has a straight, U-shaped profile with a flat crossbar (2), wherein the end transverse faces (9) of the crossbar (2) at the free lower end faces (6) serve as additional abutting or guiding faces of the pressing device (1) at the two fuel injectors (8).

Description

TECHNICAL FIELD

[0001] The invention relates to a clamping device for two fuel injectors of an internal combustion engine, which is made of sheet steel, has a crossbar with two vertically curved, flat side walls on the outer wall side and with a bolt opening for a clamping bolt in the longitudinal center, wherein the clamping device is forked open at its two ends and the free lower end faces of the side walls at the ends act as clamping faces for the fuel injectors. BACKGROUND

[0002] Such a clamping device, also called a clamp, is known from EP 2 578 868 B1. The clamping device is made of sheet steel and has a reverse U-shaped cross section. The middle region of the crossbar of the clamping device is raised from the side walls.

[0003] Further clamping devices are known from GB 2 311 558 A, Figure 2 , Figure 3 and DE 10 2007 061 487 A1. SUMMARY

[0004] It is an object of the invention to provide a clamping device which can be produced very inexpensively and at the same time has excellent strength.

[0005] According to the invention, this object is achieved in that the clamping device has a straight U-shaped profile with a flat crossbar, wherein the end transverse end faces of the crossbar at the free lower end faces serve as additional abutment or guide faces of the clamping device at the two fuel injectors.

[0006] There is thus a very simply constructed, low-cost producible clamping device, preferably for exactly two fuel injectors. If necessary, the proposed design can also take into account and provide for clamping only one fuel injector.

[0007] The main advantage is that any deep drawing is dispensed with and also any cutting finish, as is implemented in the specific embodiment, and due to the straight U-shaped shaping in cross section, a large degree of freedom with regard to the side wall height is provided. In the prior art mentioned at the outset (EP 2 578 868 B1), the side wall height is expanded to the deep-drawing limit.

[0008] At the same time, via the measures according to the invention, it is ensured that the clamping device has a good lateral abutment at the two fuel injectors via the end transverse end faces of the crossbar. This is meaningful during assembly, but also during operation of the internal combustion engine.

[0009] In a refinement of the application it is proposed that the upper side of the side wall is formed completely flat. There is a particularly simple design thereby. Alternatively, the upper side can also be raised in the middle, which has a strength advantage in the case of the same height at the ends. In both variants, the side wall contour is punched only in the blank.

[0010] Due to the accommodation of the rear pressing for the bolt head in the crosspiece, the crosspiece has a protruding insertion in the pressing device. Thereby, the rear pressing is the only deviation from the flat course of the crosspiece.

[0011] Furthermore, it is proposed that the clamping face of the pressing device is rear-pressed. This measure reinforces the structure in this region. BRIEF DESCRIPTION OF DRAWINGS

[0012] The drawing shows:

[0013] Figure 1 A variant of a pressing device with upwardly protruding side walls is shown;

[0014] Figure 2 An alternative variant with "upwardly" non-protruding side walls is shown;

[0015] Figure 3 A punched blank of a pressing device is shown, and

[0016] Figure 4 A pressing device assembled with two nozzles is shown in a half-section. DETAILED DESCRIPTION

[0017] Figure 1 , 2 and 4 disclose a pressing device 1 for two fuel nozzles 8 of an internal combustion engine, which is made from a steel sheet punched and bent without any deep-drawing and without any cutting finishing. From Figure 3 It is known for this to have a blank 13 before the bending of the finished cut side wall 3 and with punched bolt holes 4.

[0018] As shown, the pressing device 1 has a straight U-shaped profile in cross-section. Its plate-like side wall 3 is connected in the lower section by a smooth continuous crosspiece 2, in the longitudinal middle of which the bolt hole is located. The surrounding area 12 of the inside of the bolt hole 4 is rear-pressed and, in the assembled case (see Figure 4 ), accommodates the clamping bolt head 11 of the clamping bolt 15.

[0019] From Figure 1 , 2It is most clearly seen that the pressing device 1 is forked open at its two end portions 5. Its cross beam 2 is thus not completely through in the longitudinal direction. Depending on the circumstances, the free end portion areas can also be of different lengths. The free lower end face 6 of the side wall 3 at the end portion 5 serves as a clamping face for the fuel nozzle 8 (see also Figure 4 ), which is likewise post-pressed. The end cross face 9 of the cross beam 2 at the free lower end face 6 serves as an additional abutment for the pressing device 1 at both fuel nozzles 8. If necessary, there can also be a minimum gap in this area in the assembled condition.

[0020] According to the design according to Figure 1 , the upper end face 10 of the side wall 3 is raised in the middle, in contrast, according to the design according to Figure 2 , the side wall 3 is continuously flat at the upper end face 10.

[0021] List of reference signs

[0022] 1) pressing device

[0023] 2) cross beam

[0024] 3) side wall

[0025] 4) bolt hole

[0026] 5) end portion

[0027] 6) lower end face

[0028] 7) clamping face

[0029] 8) fuel nozzle

[0030] 9) end cross face

[0031] 10) upper end face

[0032] 11) clamping bolt head

[0033] 12) surrounding area

[0034] 13) blank

[0035] 14) mating clamping face

[0036] 15) clamping bolt

Claims

1. A clamping device (1) for two fuel nozzles (8) of an internal combustion engine, the clamping device being made of steel plate, the clamping device having a crossbeam (2) having two vertically curved, flat sidewalls (3) on the outer wall side and having bolt holes (4) for clamping bolts (15) at the longitudinal center, wherein the clamping device (1) is forked open at its two ends (5), and the free lower end face (6) of the sidewall (3) at the ends (5) acts as a clamping surface (7) for the fuel nozzles (8), characterized in that, The clamping device (1) has an upright U-shaped profile with a flat crossbeam (2), wherein the transverse end face (9) of the crossbeam (2) at the free lower end face (6) serves as an additional contact or guide surface of the clamping device (1) at the two fuel nozzles (8).

2. The clamping device according to claim 1, characterized in that, The upper end face (10) of the sidewall (3) is continuous and flat.

3. The clamping device according to claim 1, characterized in that, The upper end face (10) of the sidewall (3) is raised in the middle.

4. The clamping device according to claim 1, characterized in that, The bolt holes (4) in the crossbeam (2) are stamped, and the surrounding area (12) of the bolt holes is post-pressed to complementarily accommodate the clamping bolt heads (11) at the inner wall.

5. The clamping device according to claim 1, characterized in that, The clamping surface (7) is pressed later.

6. The clamping device according to claim 1, characterized in that, No cutting or finishing is applied at the clamping device (1).

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