EP3433483A1

EP3433483A1 - High-pressure line

Info

Publication number: EP3433483A1
Application number: EP17723922.5A
Authority: EP
Inventors: Alkan Göcmen; Peter Fuchs
Original assignee: Peter Fuchs Tech Group AG
Current assignee: Peter Fuchs Tech Group AG
Priority date: 2016-05-11
Filing date: 2017-05-09
Publication date: 2019-01-30
Also published as: JP2019519725A; US10746147B2; WO2017193224A1; US20190145363A1; CN109196213A

Abstract

The invention relates to a high-pressure line for conveying highly pressurised fluid to a consumer, in particular for supplying fuel under injection pressure to one or more injectors (14) of an internal combustion engine. The high-pressure line comprises a first (1), a second (2) and a third line section (3), through which line sections (1, 2, 3) the fluid flows consecutively in the intended operation of the high-pressure line, and which are all formed by a single-piece component (4) made of metal, wherein the first line section (1) and the third line section (3) each have a smaller flow cross-section than the second line section (2) arranged between same. With the high-pressure lines according to the invention, it is possible to form common-rail injection systems, which provide an individual store next to the injector for each injector in the region of the cylinder head, without injectors with integrated or built-on individual stores and with a correspondingly reduced space requirement, from which store same is supplied such that pressure oscillations in the system can be prevented as far as possible and a very good injection quality and long life span can be achieved.

Description

High-pressure line

TECHNICAL AREA

The present invention relates to a high-pressure line for conveying a fluid under high pressure to a consumer, a method for producing such a high-pressure line and an internal combustion engine, in particular a diesel or gas engine, with such a high-pressure line as a fuel line according to the preambles of the independent claims.

STATE OF THE ART

In order to be able to meet the ever stricter regulations with regard to emissions, modern diesel engines have so-called common-rail injection systems. This is understood to mean a high-pressure injection system which consists of a high-pressure pump, a high-pressure accumulator and connecting lines, the injectors and an electronic control unit for the control and monitoring of the injection. Therefore, one generally speaks of an electronic diesel injection. The primary benefit of common-rail injection is the reduced emission of soot. It is achieved by the finest atomization of the diesel during injection. The prerequisite is that the injection pressure as well as the injection rate during injection are constant. These properties are essentially borne by a constant pressure in the reservoir and this in turn by a sufficiently large volume in the memory.

For the realization of the memory function in a common rail system basically two different variants are known:

(1) formation of individual storages in the individual injectors or in storage containers attached to the injectors, or (2) Realization of the accumulator in the form of a collecting pipe with a relatively large pipe diameter, from which in each case individual supply lines go to the injectors.

The first variant has the advantage that each injector has its own memory for itself, from which it is supplied, so that the individual injectors influence each other relatively little. However, this variant has the disadvantage that it requires a relatively large amount of space in the region of the cylinder head and at least in the case of attached individual storage requires additional components and sealing points.

The second variant has the advantage that it requires relatively little space in the region of the cylinder head and no additional components and sealing points in this area are required. However, it has the disadvantage that it comes in the manifold due to the sharing of the same as memory for the injectors to pronounced pressure oscillations, which is detrimental to the injection quality and shortens the life of various components of the injection system. PRESENTATION OF THE INVENTION

It is therefore the object to provide a technical solution that does not have the aforementioned disadvantages of the prior art or at least partially avoids.

This object is solved by the subjects of the independent claims.

According to these, a first aspect of the invention relates to a high-pressure line for conveying a fluid under high pressure to a consumer, in particular for supplying diesel fuel under injection pressure to one or more injectors of a diesel engine. The high-pressure line comprises a first, a second and a third line section, which line sections are flowed through in succession in the operation of the high-pressure line according to the invention and are jointly formed by a one-piece component made of metal. In this case, the first line section and the third line section each have a smaller flow cross-section or line diameter than the second line section arranged between them.

With the high-pressure lines according to the invention, it becomes possible to form common-rail injection systems which, even without injectors with integrated or attached individual storages and correspondingly small space requirement in the area of the cylinder head, provide each injector-specific reservoir from which it is supplied, so that pressure oscillations in the system can be largely prevented and a very good injection quality and service life can be achieved.

Advantageously, the cross section of the high-pressure line in the region of the second line section is at least twice as large, preferably at least three times as large as in the first line section and / or in the third line section.

It is also preferred that the volume of the second line section is at least five times, more preferably at least ten times as large as the volume of the first and third line sections together.

It is also preferred that the line in the region of the second line section has a ratio of outer diameter to inner diameter of greater than 1.5, in particular greater than 2.5.

Such cross-sectional, volume and diameter ratios have proven to be particularly practical.

Preferably, the one-piece component of the conduit, from which the first, the second and the third line section of the high pressure line are formed of a metal material having a tensile strength greater than 900 MPa, more preferably greater than 1100 MPa.

Particularly advantageous here tempered steel, low-alloy steel or

austenitic stainless steel type X5CrNil8-10 (AISI

proved.

If the one-piece component of the line, from which the first, second and third line sections of the high-pressure line are formed, is free of joints, in particular free from welds, which is preferred, a particularly high compressive strength of this component can be achieved.

In a preferred embodiment of the high-pressure line is the one-piece component of the conduit, of which the first, the second and the third

Line portion of the high-pressure line are formed, at least in the region of the second line portion surrounded by one or more outer shells of an identical or of another material, preferably of a different metal.

In this way, inventive

High-pressure lines are provided with improved functionality, e.g. with an increased corrosion resistance inside the pipe or with an increased pressure vibration resistance.

According to a preferred variant, it is provided that between the one-piece component of the line, from which the first, the second and the third line section of the high-pressure line are formed, and an outer casing a space surrounding the high-pressure line is formed, for the controlled discharge of any leaks. This can be produced, for example, in a simple manner by adding the one-piece component to only at its outer periphery is provided with a profiling before it is provided with the sheath.

It is also preferred that the outside diameter of an outer component surrounding the one-piece component from which the first, second and third line sections of the high-pressure line are formed is more than twice, preferably more than, in the region of the second line section Is three times the inner diameter of the line. Such diameter ratios have proven to be particularly practical.

In a further preferred embodiment of the high-pressure line, a taper is present within the first line section, the second line section and / or the third line section for damping pressure oscillations in the line.

Advantageously, the first line section and / or the third line section and / or a possible taper in the first, the second or the third line section have been formed by rotary swaging or by use of rotary swaging. By this cold deformation, the deformed portions have increased strength, which is desirable.

It is particularly preferred that the one-piece component from which the first, the second and the third line section of the high-pressure line are formed from a preferably produced by cold drawing or deep drilling tube material with the cross section of the second line section by Rundkne- th or using Rotary swaging has been formed. Such components can be produced in a cost effective manner and free of joints.

In yet another preferred embodiment, the high-pressure line has exactly one feed opening and exactly one discharge opening.

In this case, the first line section and the third line section are preferably connected to the end arranged the high-pressure line and as connecting portions for pressure-tight connection of the high-pressure line to high-pressure fluid inlet and discharge components formed, with advantage such that they have molded or kneaded thereon pressure rings.

Such lines are particularly suitable as outgoing from a common manifold supply lines for individual injectors or as modular bridge lines, which connect the injectors directly aufeinan- next following cylinders of an engine together and thus together form a continuous high-pressure fuel line.

If, in this case, the outer diameter of the high-pressure line in the region of the first line section and / or the third line section is smaller than in the region of the second line section, the additional advantage is that less space is required in the area of the connection points.

In yet another preferred embodiment, the high-pressure line along its longitudinal extent arranged alternately line sections with a smaller line cross section or line diameter and with a larger line cross-section or line diameter, thus has a plurality of interconnected storage areas on narrower sections. In the event that the line sections with the larger line cross-section or line diameter each have a radial discharge opening, such high pressure lines according to the invention can be used as a manifold with several cascaded via damping sections memories, then each memory is assigned to an injector, which he on a single supplied its radial discharge opening subsequent supply line with fuel. As a result, the problem of pressure fluctuations known in common-rail systems with a common manifold and individual supply lines extending therefrom can be avoided. significantly reduced, thereby improving the injection quality and the life of various components of the injection system.

Such a high-pressure line advantageously has a single axial feed opening. As a result, the production can be facilitated and the number of sealing points can be kept low.

In yet another preferred embodiment, the high-pressure line according to the invention is bent, in particular in the region of the second line section. Such lines have the advantage that they can be easily adapted to structural conditions.

A second aspect of the invention relates to a method for producing a high pressure line according to the first aspect of the invention. In this case, a metal tube with a tube cross-section which is substantially uniform over its tube length is reduced at least two spaced-apart tube sections by round knobs in the region of these sections in its tube cross-section.

With the method according to the invention, high-pressure lines according to the invention can be produced in a cost-effective manner, which moreover have the advantage that they have increased strength in the formed regions.

In a preferred embodiment of the method, the rotary kneading takes place at least in the region of the ends of the metal tube. In this way, the pipe ends can simultaneously be formed as connecting sections for pressure-tight connection of the high-pressure line thus produced to high-pressure fluid and laxative components, for example with molded or kneaded thereon pressure rings, by means of which a positive engagement in the axial direction at the respective pipe end Fasteners is possible. In a further preferred embodiment of the method, the swaging is carried out in one or more pipe sections such that the respective pipe cross-section beyond the desired cross-sectional reduction is reduced and then, in particular by means of drilling, to the desired cross-sectional dimension is increased.

In yet another preferred embodiment of the method, the swaging is carried out in one or more pipe sections such that the respective pipe cross-section around an inner tool, in particular around a mandrel, is kneaded until the material is completely applied to the tool, and then removed the tool is that the remaining pipe cross section in this area substantially corresponds to the tool cross section.

With the two last-mentioned embodiments of the method according to the invention, precisely dimensioned pipe cross-sections can be achieved in the formed regions.

A third aspect of the invention relates to an internal combustion engine, preferably a diesel or gas engine, with a fuel high-pressure pump permanently providing fuel under injection pressure in operation, which is connected via high-pressure lines to injectors associated with the individual cylinders of the engine. In this case, at least a part of the high-pressure lines according to the first aspect of the invention is formed.

When using the inventive

High-pressure lines as high-pressure lines in the common-rail injection system of an internal combustion engine, the advantages of the invention are particularly evident.

In a first preferred embodiment of the engine, the fuel pump conveys into a high-pressure manifold, from which each injector leads a single high-pressure feed line to the respective injector. It is preferred that the respective high-pressure feed line leading to the injector according to the first aspect of the invention is formed and has exactly one feed opening and exactly one discharge opening, and it is further preferred that the first line section and the third line section at the ends of High-pressure line are arranged and as connecting portions for pressure-tight connection of the line to high-pressure fluid inlet and discharge components are formed, preferably with pressure molded or kneaded thereon pressure rings. It is likewise preferred that the outer diameter of the high-pressure line in the region of the first line section and / or of the third line section is smaller than in the region of the second line section.

It is further preferred that the high-pressure manifold according to the first aspect of the invention is formed and arranged along its longitudinal extent alternately line sections with smaller line cross section or line diameter and with a larger line cross-section or line diameter, wherein the line sections with larger cross-section or Line diameter each having a radial discharge opening on which the high-pressure feed line connects to the respective injector. It is further preferred that the high-pressure manifold has a single axial feed opening.

In a second preferred embodiment of the engine, the injectors of directly consecutive cylinders of the engine are connected to one another via preferably high-pressure bridge lines arranged therebetween according to the first aspect of the invention, such that the bridge lines together form a continuous high-pressure line. The fuel high-pressure pump thereby promotes a high-pressure line, which to one of the injectors leads and from there into a leading away from this injector bridge line.

It is preferred that the bridge lines each have exactly one feed opening and exactly one discharge opening, and it is further preferred that the first line section and the third line section are arranged at the ends of the respective high-pressure line and as connection sections for pressure-tight connection of the line to high-pressure fluid incoming and outgoing components are formed, preferably with it molded or kneaded thereon pressure rings. It is also preferred that the outer diameter of the bridge lines in the region of the first line section and / or the third line section is smaller than in the region of the second line section.

With such internal combustion engines, excellent exhaust gas values and long service lives of the injection components can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

Further preferred embodiments of the invention will become apparent from the dependent claims and from the following description with reference to FIGS. Show:

1 shows a longitudinal section through a first inventive high-pressure feed line.

2 shows a longitudinal section through a second inventive high-pressure feed line.

3 shows a longitudinal section through a third inventive high-pressure feed line.

3a shows a section along the line A-A in Fig. 3rd

4 shows a longitudinal section through a first high-pressure bridge line according to the invention; 5 shows a longitudinal section through one half of a second high-pressure bridge line according to the invention;

6 shows a longitudinal section through a connecting end of a high-pressure line according to the invention with a pressure ring kneaded thereon;

7 shows a longitudinal section through a section of a first high-pressure manifold according to the invention;

8 shows a longitudinal section through a section of a second high-pressure manifold according to the invention with high-pressure feed lines connected thereto according to the invention;

Fig. 8a is a section along the line B-B in Fig. 8;

9 shows a section through two high-pressure bridge lines according to the invention connected to an injector; and

10 shows a longitudinal section through a partial section of a third high-pressure manifold according to the invention.

WAYS FOR IMPLEMENTING THE INVENTION

1 shows a longitudinal section through a first inventive high-pressure injector feed line of a common-rail injection system of a diesel engine for connecting the injector to a high-pressure manifold of the injection system.

As can be seen, the high-pressure injector feed line has three line sections 1, 2, 3, which are flowed through in succession by the diesel fuel entering the line at the feed opening 7 and flowing off via the discharge opening 8 to the injector, and together formed by a one-piece tubular body 4 made of a low-alloyed tempering steel of the type 42CrMo4. The tubular body 4 is free of joints. The first line section 1 and the third line section 3, which are formed at the ends of the Hochdruckinjektorspeiseleitung and are designed as straight pipe sections, each have a smaller ren pipe diameter than the arranged between them second line section 2, which is designed as a 90 "elbow The line diameter in the second line section 2 corresponds approximately to 2.5 times the line diameter in the first and third line sections 3, respectively.

The second line section 2 is approximately the same length as the first 1 and the third line section 3 together, and its volume is more than five times as large as the volume of the first 1 and the third line section 3 together.

The first pipe section 1 and the third pipe section 3 were formed by swaging, and had a cross section identical to that of the second pipe section 2 before swaging. Accordingly, the outside diameter of the high pressure pipe is smaller in the area of the first pipe section 1 and the third pipe section 3 than in the area of the second line section 2, and the ratio of outer diameter to inner diameter is approximately 1.6 in the area of the second line section 2, while it is approximately 3.4 in the area of the first line section 1 and the third line section 3.

FIG. 2 shows a longitudinal section through a second high-pressure injector feed line according to the invention of a common-rail injection system, which differs from that shown in FIG. 1 only in that the third line section 3 has a taper 6 in the region of the discharge opening 8, for the purpose of damping Pressure oscillations in the pipe.

FIG. 3 shows a longitudinal section through a third inventive high-pressure injector feed line of a common-rail injection system, and FIG. 3a This high-pressure Injektorspeiseleitung differs from that shown in Fig. 1 in that the three line sections 1, 2, 3 forming one-piece component 4 is thin-walled and is formed from tempered steel and about his whole

Extension is surrounded gap-free by an outer sheaths 4a made of austenitic stainless steel. The total wall thicknesses resulting in this way are approximately comparable in the individual line sections 1, 2, 3 with those in the high-pressure injector feed line from FIG. 1. Here, too, the first line section 1 and the third line section 3 were formed by rotary swaging. Before swaging, they had a cross-section identical to that of the second line section 2.

4 shows a longitudinal section through a first high pressure bridge line according to the invention (also referred to as jumper line) of a common rail injection system of a diesel engine for connecting two injectors of the engine.

This high-pressure bridge line differs from the high-pressure injector feed line shown in FIG. 1 only in that it has a mirror-image form, in which the end-side first and third line sections 1, 3 are identically designed and oriented in the same direction and over a bow-shaped middle second line section 2 are interconnected. Here, the second line section 2 is significantly longer than in the high-pressure injector feed line shown in Fig. 1, whereby its volume is correspondingly larger. Otherwise, all that has previously been said for the high-pressure injector feed line shown in FIG. 1 also applies to this high-pressure bridge line.

Fig. 5 shows a longitudinal section through a

Half of a second inventive high-pressure bridge line, which has the same mirror-image basic form has as the high-pressure bridge line shown in Fig. 4. The bridge line shown here differs from the line shown in FIG. 4 only in that it has alternating line sections with a smaller line diameter 3, 3a and line sections with a larger line diameter 2a, 2b along its longitudinal extent, namely a total of five line sections smaller line diameter (because of the representation of only one half of the line only two (3, 3a) and a part of a third visible) and a total of four line sections with a larger line diameter (only one half of the line shown only two (2a, 2b) visible ). The end-side line sections 1, 3 (only visible on the left line section 1 because of the illustration of only one half of the line) are identical to the high-pressure bridge line illustrated in FIG. 4.

6 shows a longitudinal section through an end-side connection section 3 with discharge opening 8 of a high-pressure line according to the invention, as shown in the preceding figures, with a pressure ring 11 kneaded thereon.

7 shows a longitudinal section through part of a first high-pressure manifold according to the invention of a common-rail injection system of a diesel engine, with which a plurality of high-pressure feed lines for the injectors of the injection system are supplied.

As can be seen, the high-pressure collecting line has a supply line section 1 with a feed opening 7, a distributor section 2 and, starting from the distributor section 2, a plurality of discharge channels 3, which each form a discharge opening 8 of the collecting line, for supplying the feed lines to be connected thereto for the injectors.

The supply line section 1, the distributor section 2 and the discharge channels 3 are in intended operation sequentially flows through from the entering at the feed opening 7 in the manifold and flowing through the discharge openings 8 to the feed lines for the injectors diesel fuel and are formed together by a one-piece tubular body 4 made of a quenched, low alloy steel with a tensile strength greater than 900 MPa.

The supply line section 1 and the distributor section 2 are designed as straight tube sections arranged in succession with coincident center axes, while the discharge channels 3 branch off radially from the distributor section 2.

The feed pipe portion 1 has a smaller pipe diameter than the manifold portion 2, and the exhaust ducts 3 have smaller pipe diameters than the feed pipe portion 1. The pipe diameter of the manifold portion 2 is about twice the pipe diameter of the feed pipe portion 1, whose pipe diameter is again about three times the pipe diameter Abführungskanäle 3 corresponds.

The feed line section 1 was formed by swaging, and before swaging, had a cross section identical to that of the manifold section 2. Accordingly, the outside diameter of the manifold in the region of the first feed line section 1 is smaller than in the region of the second manifold section 2. The ratio of outside diameter to inside diameter is in the region of the distributor section 2 about 2.0, while in the region of the supply line section 1 is about 3.6.

The discharge channels 3 with the discharge openings 8 were introduced by drilling into the wall of the distributor section 2.

Fig. 8 shows a longitudinal section through a

Part of a second high-pressure manifold 12 according to the invention with attached thereto erfindungsge have high-pressure feed lines 13 and Fig. 8a shows a section along the line BB in Fig. 8. The

Sectioning of Fig. 8 follows the line C-C in Fig. 8a.

The high-pressure manifold 12 shown here differs from the manifold shown in Fig. 7 in that the one-piece tubular body 4, which (not shown), the supply line section, the manifold portion 2 and the discharge channels 3 with the discharge openings, in the areas between the Connections 9, 10 of the high-pressure feed lines 13 is surrounded by an outer casing 4 b made of metal, which forms together with the tubular body 4, a pipe body 4 surrounding space 5 for the controlled discharge of any leaks.

The high-pressure feed lines shown here

13 differs from the feed line shown in FIG. 3 in that the sheathing 4a is missing at the connection ends of the lines 13 and instead a kneaded pressure ring 11 is present instead, the fastening of the respective line end by means of a collar flange 9 at one of the high pressure -Sammelleitung 12 encompassing mounting body 10 is used.

9 shows a section through two high-pressure bridge lines 15 according to the invention which are connected to an injector 14 (in each case only partially shown).

The high-pressure bridge lines 15 shown here differ from the bridge line shown in FIG. 4 in that they are provided with a casing 4a except for the connection ends and a pressure ring 11 which is kneaded on each end is present at the end of the connection Line end by means of a union nut 9 to a terminal block 10 of the injector 14 is used.

10 shows a longitudinal section through part of a third high-pressure manifold according to the invention of a common-rail injection system of a diesel engine. motors, with which several high-pressure feed lines for the injectors of the injection system are supplied.

This high-pressure manifold differs from the manifold shown in Fig. 7 only in that the one-piece tubular body 4, which forms the supply line section 1, the manifold section 2 and the discharge channels 3 with the discharge openings 8, in the region of the distributor section 2 along its longitudinal extension one behind the other arranged alternately line sections 6 with smaller line diameter and line sections 2a, 2b, 2c having a larger cable diameter. In this way, the storage section 2 forms a plurality of storage areas connected to one another over narrower sections, of which one respective radial discharge channel 3 with discharge opening 8 leaves. Accordingly, during the intended use of this high-pressure manifold, each of these storage areas 2a, 2b, 2c is assigned exactly to one injector, which it supplies with fuel via a single supply line adjoining its radial discharge opening 8.

The tapered pipe sections 6 with the smaller pipe diameter were produced by swaging.

While preferred embodiments of the invention have been described in the present application, it is to be understood that the invention is not limited thereto and may be practiced otherwise within the scope of the following claims.

Claims

1. High-pressure line for conveying a fluid under high pressure to a consumer, in particular for supplying fuel under injection pressure to one or more injectors (14) of an internal combustion engine, comprising a first (1), a second (2) and a third line section (3) which line sections (1, 2, 3) are flowed through in succession during normal operation of the high-pressure line and are jointly formed by a one-piece component (4) made of metal, the first line section (1) and the third line section (3) each having a smaller flow cross-section in particular, have a smaller line diameter than the second line section (2) arranged between them.

2. High-pressure line according to claim 1, wherein the line cross section of the line in the region of the second line section (2) is at least twice as large, in particular at least three times as large as in the first (1) and / or in the third line section (3).

3. High-pressure line according to one of the preceding claims, wherein the volume of the second line section (2) at least five times, in particular at least ten times as large as the volume of the first (1) and the third line section (3) together.

4. High-pressure line according to one of the preceding claims, wherein the line in the region of the second line section (2) has a ratio of outer diameter to inner diameter of greater than 1.5, in particular greater than 2.5.

5. High-pressure line according to one of the preceding claims, wherein the one-piece component (4) of Line is formed of a material having a tensile strength greater than 900 MPa, in particular greater than 1100 MPa.

6. High-pressure line according to one of the preceding claims, wherein the one-piece component (4), which forms the first (1), the second (2) and the third line section (3) of the high-pressure line, from a quenched steel, a low-alloy steel or a austenitic stainless steel type X5CrNil8-10

7. High-pressure line according to one of the preceding claims, wherein the one-piece component (4), which forms the first (1), the second (2) and the third line section (3) of the high pressure line, free of joints, in particular free of welds, is ,

8. High-pressure line according to one of the preceding claims, wherein the one-piece component (4), which ches the first (1), the second (2) and the third

Line section (3) of the high-pressure line forms, at least in the region of the second line section (2) of one or more Außenumraantelungen (4a, 4b) is surrounded by an identical or of another material, in particular of a different metal.

A high-pressure pipe according to claim 8, wherein there is provided an outer jacket (4b) which together with the integral member (4) having the first (1), second (2) and third pipe sections

(3) The high pressure line forms, one piece Component (4) surrounding space (5) for the controlled discharge of any leaks.

10. High-pressure line according to one of claims 8 to 9, wherein the outer diameter of the one-piece component (4) which forms the first (1), the second (2) and the third line section (3) of the high-pressure line, surrounding outer casing (4a, 4b) in the region of the second line section (2) is more than twice, in particular more than three times the inner diameter of the line.

11. High-pressure line according to one of the preceding claims, wherein within the first (1), the second (2) and / or the third line section (3) has a taper (6) of the line cross-section, for damping pressure oscillations in the line.

12. High-pressure line according to one of the preceding claims, wherein the first (1) and / or the third line section (3) and / or a possible taper (6) in the first, second or third line section by swaging or by the use of rotary swaging has been shaped.

13. High-pressure line according to claim 12, wherein the one-piece component (4), which forms the first (1), the second (2) and the third line section (3) of the high pressure line, from a, in particular by cold drawing or deep drilling tube material produced with the Cross section of the second line section has been formed by rotary swaging or using rotary swaging.

14. High-pressure line according to one of the preceding claims, wherein the high-pressure line exactly one Feed opening (7) and exactly one discharge opening (8).

15. High-pressure line according to claim 14, wherein the first (1) and the third line section (3) are arranged at the ends of the high-pressure line and are constructed as connection sections for pressure-tight connection of the high-pressure line to high-pressure fluid and discharge components (9, 10). in particular with compression rings (11) molded onto or kneaded thereon.

16. High-pressure line according to one of claims 14 to 15, wherein the outer diameter of the high-pressure line in the region of the first (1) and / or the third line section (3) is smaller than in the region of the second line section (2).

17. High-pressure line according to one of the preceding claims, wherein the high-pressure line arranged along its longitudinal extension alternately line sections (1, 3, 3a) with smaller line cross-section or line diameter and line sections (2a, 2b) having a larger line cross-section or line diameter, and in particular, wherein the line sections with a larger line cross-section or line diameter each have a radial discharge opening.

18. High-pressure line according to claim 17, wherein the line has a single axial feed opening (7).

19. High-pressure line according to one of the preceding claims, wherein the high-pressure line, in particular in the region of the second line section (2), is bent.

20. A method for producing a high-pressure line according to one of the preceding claims, comprising the steps:

a) providing a metal tube with a tube over the pipe length substantially uniform pipe cross-section, and

b) swaging the metal tube on at least two spaced pipe sections to reduce the pipe cross-section in the region of these sections.

21. The method of claim 20, wherein the rotary kneading takes place in the region of the ends of the metal tube.

22. The method of claim 21, wherein a pressure ring is integrally formed or kneaded at the respective end of the metal tube by the swaging, by means of which a positive engagement in the axial direction at the respective pipe end with fastening means for the purpose of connecting the pipe to a component is possible.

23. The method according to any one of claims 20 to

22, wherein the rotary kneading takes place at a plurality of in particular uniformly spaced pipe sections in the region between the ends of the metal tube.

24. The method according to any one of claims 20 to

23, wherein the rotary kneading is carried out at least in a pipe section such that the pipe cross-section is reduced beyond the desired reduction in cross-section and then, in particular by means of drilling, to the desired cross-sectional dimension is increased.

25. The method according to any one of claims 20 to

24, wherein the rotary kneading is at least in a pipe section such that the pipe cross-section to a Inner tool around, in particular around a mandrel, is kneaded until the material is completely applied to the tool, and the tool is then removed such that the remaining pipe cross section in this area substantially corresponds to the tool cross section.

26. Combustion engine, in particular diesel or gas engine, with a permanently fuel in operation under injection pressure providing high-pressure fuel pump, which is connected via high pressure lines with the individual cylinders of the engine associated injectors (14), wherein the high pressure lines a high pressure line (12, 13, 15) according to any one of claims 1 to 19.

27. Internal combustion engine according to claim 26, wherein the fuel high-pressure pump in a high-pressure manifold (12) promotes, from which each injector a single high-pressure feed line (13) leads to the respective injector.

28. Internal combustion engine according to claim 27, wherein the high-pressure feed lines leading to the injector (13) are designed as high-pressure lines according to one of claims 14 to 16.

29. Internal combustion engine according to any one of claims 24 to 28, wherein the high pressure manifold (12) is designed as a high pressure line according to one of claims 17 to 18.

30. Internal combustion engine according to claim 26, wherein the injectors (14) of directly successive cylinders of the engine are each connected to one another via these, in particular identically designed high-pressure bridge lines (15), such that the Bridge lines (15) together form a continuous high-pressure line, and wherein the high-pressure fuel pump delivers into a high-pressure line, which leads to one of the injectors (14) and from there into a of this injector (14) leading away bridge line (15) feeds.

31. Internal combustion engine according to claim 30, wherein the bridge lines (15) are designed as high-pressure lines according to one of claims 14 to 16.