DE102009005286B4 - Internal combustion engine with fuel injection nozzle - Google Patents

Abstract

An internal combustion engine (1) having a cylinder head (2) and at least one air intake manifold (3) attached to the cylinder head (2), which has a fuel injector (4), the fuel injector (4) being located in an end region (5) of the air intake manifold (3) that its ejection opening (6) is located inside the cylinder head (2), wherein the air intake manifold (3) and cylinder head (2) are fastened to each other by means of a detachable flange connection (7), and wherein the air intake manifold (3) has a guide insert (23 ) for guiding the fuel injection nozzle (4), wherein the guide insert (23) at least one at areas of the fuel injection nozzle (4) abutting guide surface (24) for the fuel injection nozzle (4), characterized in that the flange connection (7) at least one flange (17) with at least one seal (20) arranged in a front-side groove ring (19) and at least one counter-flange (18 ) having at least one end face formed, the groove ring (19) of the flange (17) associated projection ring (22), and that the guide insert (23) at least partially a groove wall (26) of the Nutrings (19), wherein the fuel injection nozzle ( 4) extends at least partially between the U-ring (19) and the guide insert (23) and is partially guided and / or held in an insertion phase (36) formed by a recess in the cylinder head (2).

Description

The invention relates to an internal combustion engine with a cylinder head and at least one attached to the cylinder head Luftansaugkrümmer having a fuel injector.

The US 4 922 876 A describes an internal combustion engine having an injector attached to an air intake manifold such that the injector is disposed in regions within the air intake manifold and may inject fuel into a portion of a throttle disposed within the air intake manifold.

The EP 0 690 224 B1 describes an injector mounted in a receiving seat on an air intake manifold with an ejection port located within the air intake manifold.

The EP 0 161 693 B1 has an injector arrangement for the object, which consists of a U-shaped nozzle holder and a plurality of injection nozzles. The injection nozzles extend into the nozzle holder and are fastened together with the nozzle holder to an internal combustion engine.

The DE 103 34 913 A1 describes an intake manifold having an injector pack assembly wherein the injectors extend into a mounting plate of the injector pack assembly to which they are attached.

The DE 697 08 598 T2 describes injectors which are attached to a cylinder head.

Next describes the JP H11-44 280 A a mounting structure for an injection valve of an internal combustion engine, wherein the injection valve projects from a cylinder head wall of a cylinder head in this spaced.

The DE 199 20 195 A1 describes an air intake system for an internal combustion engine, in which the injection valve is fully integrated in the cylinder head.

The US 5,022,371 A relates to a fuel rail for an internal combustion engine. Shown is a fully arranged in an air intake manifold injection valve.

The object of the invention is to provide an internal combustion engine with fuel injectors, which are easy to assemble and have a good injection behavior.

According to the invention, the flange connection has at least one flange with at least one seal arranged in an end-face groove ring and at least one counter flange with at least one projection ring formed on the end face, the groove ring of the flange, and that the guide insert forms a groove wall of the groove at least in regions, wherein the fuel injector extends at least partially between the U-ring and the guide insert and is partially guided and / or held in an insertion phase formed by a recess in the cylinder head. The invention relies on the fuel injector being mounted in an end portion of the air intake manifold such that its ejection port is within the cylinder head. The advantage here is that the fuel injector can be mounted in a simple manner to the Luftansaugkrümmer and at the same time the ejection opening is located very close to the combustion chamber of the internal combustion engine, so that injection of fuel over a very short distance into the combustion chamber is possible. Because of this short distance for the fuel, a very good injection behavior can be produced, since disturbing air vortices within the air intake manifold have only a small area in which they can deflect injected fuel and an undesirable scattering of injected fuel within the combustion chamber can be kept low.

According to the invention it is provided that Luftansaugkrümmer and cylinder head are fastened by means of a releasable flange connection to each other. The detachable flange connection allows the air intake manifold to be attached to the cylinder head and replaced if necessary. This leads to advantages in the maintenance and manufacture of the internal combustion engine, since for different fuel injectors only different air intake manifolds must be made and the cylinder head can be maintained unchanged.

According to a development of the invention, it is provided that the fuel injection nozzle is located in the region of the flange connections. This is understood in particular to mean that the fuel injection nozzle extends from the region of the air intake manifold into the cylinder head through the flange connection. This can be done within the air intake opening - ring opening - which is formed between Luftansaugkrümmer and cylinder head and / or by parts of the flange itself. Thus, it is achieved that the fuel injection nozzle can be securely fixed in the end region of the air intake manifold near the cylinder head and at the same time a disturbance of the intake air in the air intake manifold is avoided.

It is further provided that at least a portion of the fuel injector in Luftansaugkrümmer is located and at least one further, the ejection opening exhibiting portion located in the cylinder head.

According to a development of the invention it is provided that the Luftansaugkrümmer has a receiving seat for the fuel injector. This receiving seat leads to a particularly firm and secure hold of the fuel injector on the Luftansaugkrümmer. It is provided that the receiving seat is preferably cylindrical tube-shaped and surrounds the injection nozzle in regions, wherein an outlet opening is provided through which the fuel injector can extend into the region of the cylinder head. In addition, it is preferably provided that a longitudinal axis of the receiving seat extends transversely to a longitudinal axis of the end portion of the Luftansaugkümmers so that the fuel injector extends from an outer area around the end portion of the air intake manifold through the Luftansaugkrümmer and / or its flange in the cylinder head.

According to a development of the invention it is provided that the receiving seat is a threaded seat.

According to a development of the invention it is provided that the receiving seat in the end region of the Luftansaugkrümmers, in particular in the region of the flange connection, is arranged. The close proximity to the cylinder head of the receiving seat facilitates attachment of the fuel injector to the air intake manifold such that the ejection port is within the cylinder head. Due to the small spacing of the receiving seat from the cylinder head, a fuel injector can be used, which has a small longitudinal extent.

According to the invention, it is provided that the flange connection has at least one flange with at least one front-side groove ring and at least one counter-flange with at least one front-side formed, the groove ring of the flange associated, projection ring. By using a Nutrings and a corresponding projection ring a particularly tight flange connection can be achieved. It is envisaged that within the Nutrings a seal of sealing material - for example in the form of a sealing track - is arranged, against which the projection ring is pressed after assembly.

On the other hand, it may be provided that the fuel injection nozzle extends through the flange connection at least in regions within an annular opening of the groove. It is envisaged that the fuel injector extends through the flange connection within the groove. The ring opening formed by the grooved ring is thereby traversed by the injection nozzle. This is to be understood that the fuel injector is located within the Nutrings, wherein between the fuel injector and the U-ring at least one groove wall is arranged.

According to the invention it is provided that the air intake manifold has a guide insert for guiding the fuel injection nozzle. The guide insert allows easy production of the air intake manifold.

According to the invention it is provided that the guide insert has at least one guide surface for the fuel injection nozzle. The guide surface abuts areas of the fuel injector and allows easy mounting of the fuel injector. Further, due to the guide surface, the guide insert is allowed to be used as a holding and / or supporting device for the fuel injection nozzle. Also, with an appropriate choice of material, it is conceivable that a sealing guide surface is provided, which seals a region around the fuel injection nozzle.

According to a development of the invention, it is provided that the guide insert is an inner tube fitted in particular in the air intake manifold. In this way, a simple assembly of the guide insert is made possible. By fitting the inner tube into the air intake manifold, it is possible to insert the guide insert into the air intake manifold for assembly. It is advantageous if the guide insert is designed such that is held by the assembly of the fuel injector. Such a guide insert may be formed in different geometries depending on the cross-sectional geometries of the air intake manifold. Preferably, in this case round, elliptical and / or polygonal designs are conceivable.

Furthermore, it is provided according to this development that the guide insert at least partially forms a groove wall of the Nutrings. This ensures that the Luftansaugkrümmer, at least partially, only one groove wall must be made in a simple manner and the second groove wall necessary for the groove is made by mounting the guide insert. This leads to a simplification of the manufacture, installation and maintenance of the air intake manifold. Further, other materials may be used for the guide insert than for the air intake manifold, so that, for example, sealing measures can be made to the fuel injector.

It may also be provided that the Luftansaugkrümmer has a receptacle for the guide insert. It is preferably provided that the receptacle is designed such that an axial displacement of the guide insert is prevented away from the cylinder head. This may preferably be produced by a grading of the tube inner diameter, that is by a reduction in cross-section in the direction of the air intake manifold, which leads away from the flange connection.

The invention provides that the fuel injection nozzle extends at least partially between the U-ring and the guide insert. In particular, it is provided that the groove wall is formed in areas of the guide insert, in which the fuel injection nozzle is not enclosed by the guide insert.

The drawings illustrate the invention by means of embodiments, and that shows

1 a detail of an internal combustion engine according to the invention,

2 the internal combustion engine of 1 in a perspective view,

3 an air intake manifold in cross-section,

4 the air intake manifold of 3 in an exploded view,

5 an arrangement of a fuel injection nozzle in a negative-represented cylinder head channel,

6 a detailed representation of the arrangement of 5 .

7 a further arrangement of the fuel injection nozzle in the negative-illustrated cylinder head channel and

8th a detailed representation of the arrangement of 7 ,

The 1 shows a detail of an internal combustion engine 1 with a cylinder head 2 at which an air intake manifold 3 is attached. At the air intake manifold 3 is a fuel injector 4 arranged. The fuel injector 4 is in the end area 5 of the air intake manifold 3 attached, with an ejection opening 6 inside the cylinder head 2 lies. The air intake manifold 3 is on the cylinder head 2 by means of a flange connection 7 connected. The fuel injector 4 partly lies in the area of the flange connection 7 , where a first section 8th the fuel injector 4 inside the cylinder head 2 and a second section 9 the fuel injector 4 inside the air intake manifold 3 lies. For fixing the fuel injection nozzle 4 at the air intake manifold 3 owns the air intake manifold 3 a recording seat 10 , which as threaded seat 11 is trained. In the threaded seat 11 - For example, a threaded insert - can the fuel injector 4 be screwed. For this purpose, the fuel injector 4 a corresponding, not shown counter thread on. To the fuel injector 4 with fuel 13 to supply is a fuel line 12 provided which the fuel 13 to the injection nozzle 4 leads. The fuel injector 4 is with a seal 14 in the form of an O-ring 15 provided, which the receiving seat 10 and the fuel injector 4 fuel-tight connects. From the ejection opening 6 occurs a fuel spray 16 which has a substantially conical shape. The flange connection 7 consists of a flange 17 and a counterflange 18 , The flange 17 is part of the air intake manifold 3 whereas the counterflange 18 on the cylinder head 2 is trained. The flange 17 has a groove ring 19 on, in which a seal 20 consisting for example of a sealant 21 or a sealing ring is introduced. The sealant 21 can be shaped as a sealing track. In the groove ring 19 engages a projection ring 22 one, which at the counter flange 18 is trained. To form the flange 17 is the air intake manifold 3 designed in several parts and has a guide insert 23 on, which with a guide surface 24 which is the fuel injector 4 partially encloses. The leadership assignment 23 is in the form of an inner tube 25 formed and partially formed a groove wall 26 , The air intake manifold 3 has a diameter step 27 on which a shot 28 for the leadership use 23 forms.

The 2 shows the section 1 in a perspective view with all the features in 1 are shown. In addition, the shows 2 two more fuel injectors 29 and 30 , which directly on the cylinder head 2 are attached.

The illustrated arrangement of the fuel injector 4 makes it possible to easily secure fit and secure attachment of the fuel injector 4 in the end area 5 of the air intake manifold 3 bring about. This will allow the ejection opening 6 inside the cylinder head 2 is located and thus flow near the combustion chambers of the cylinder is arranged. Thereby, an injection path, which of the fuel jet 16 must be overcome, shortened and it can be a particularly good spray pattern produced within the combustion chamber. At the same time allowed in the 1 and 2 illustrated arrangement a simple and quick replacement of the fuel injectors 4 . 29 and 30 ,

The 3 shows the air intake manifold 3 of the 1 with all its features in cross-section. Further, the fuel spray 16 shown. The fuel injector 4 is not shown for reasons of clarity.

The 3 clarifies how the leadership use 23 inside the air intake manifold 3 is arranged and thus partially the groove wall 26 forms. In the area of the guiding surface 24 is an additional wall 32 arranged in the area of the guide surface 24 the groove wall 26 forms. Within the Nutring 19 is the sealant 21 as a seal 20 , For example, in the form of the sealing track, arranged so that the flange 17 around the ring opening 33 is fuel-tight around. The illustrated arrangement shows in cross-section that the Luftansaugkrümmer 3 in the end area 5 a stepped profile 34 has, through which on the one hand the recording 28 for the leadership use 23 is formed and on the other hand, the outer groove wall 27 is formed.

The 4 shows the air intake manifold 3 as well as the leadership assignment 23 in an exploded view. The leadership assignment 23 Can take along an arrow in the recording 28 be inserted. This makes it clear in what way by the leadership use 23 partially the groove wall 26 is produced and how in the area of the guide surface 24 through the wall 32 the groove wall 26 is continued. It becomes clear that through the use of leadership use 23 a simplification to the formation of the flange 17 in the production. The two parts, the air intake manifold 3 as well as the leadership assignment 23 , can be made separately from each other and then joined together. This makes it easy to get a flange 17 with a grooved ring 19 and at the same time bring about a possibility with which the fuel injector 4 securely fixed and guided.

The 5 shows the fuel injector 4 and a cylinder head channel 35 , The cylinder head channel 35 is shown in negative representation. This means that the illustration does not show the walls, but that of the cylinder head channel 35 formed space. The cylinder head channel 35 has an introduction phase 36 which involves arranging the fuel injector 4 like this in 1 is shown, relieved. The introduction phase 36 is a recess in the cylinder head 2 in which the fuel injector 4 is partially managed and / or held. By using the insertion phase 36 will allow the fuel injector 4 especially far in the cylinder head 2 , which is not shown here, can penetrate and thus the ejection opening 6 the fuel injector 4 especially close to the combustion chamber of the internal combustion engine 1 is arranged, which further improve the already said benefits.

6 shows a part of the 5 with the introduction phase 36 in a detailed view. In addition, there is a sealing line 37 shown which the extension of the projection ring 22 represents.

The 7 shows a further embodiment 38 of the cylinder head channel 35 with a further, second embodiment 39 the introduction phase 36 , Execution 39 the introduction phase 36 is due to the conditions of the cylinder head channel 35 in the second embodiment 38 customized. This is characterized by the fact that the introduction phase 36 extended in the injection direction.

The 8th shows a part of the 7 in more detail. In addition to the characteristics of 7 is a second version 40 the sealing line 37 shown.

LIST OF REFERENCE NUMBERS

1

Internal combustion engine

2

cylinder head

3

air intake manifold

4

fuel Injector

5

end

6

ejection

7

flange

8th

section

9

section

10

receiving seat

11

threaded seat

12

Fuel line

13

fuel

14

poetry

15

O-ring

16

Fuel jet

17

flange

18

counterflange

19

Nutring

20

poetry

21

sealant

22

lead ring

23

guide insert

24

guide surface

25

inner tube

26

groove wall

27

groove wall

28

admission

29

fuel Injector

30

fuel Injector

32

wall

33

ring opening

34

Stepped profile

35

Cylinder head channel

36

insertion phase

37

sealing line

38

execution

39

execution

40

execution

Claims (7)

Internal combustion engine ( 1 ) with a cylinder head ( 2 ) and at least one on the cylinder head ( 2 ) attached air intake manifold ( 3 ), which is a fuel injector ( 4 ), wherein the fuel injector ( 4 ) in an end region ( 5 ) of the air intake manifold ( 3 ), that its ejection opening ( 6 ) within the cylinder head ( 2 ), wherein Luftansaugkrümmer ( 3 ) and cylinder head ( 2 ) by means of a detachable flange connection ( 7 ) are attached to each other, and wherein the air intake manifold ( 3 ) a leadership assignment ( 23 ) for guiding the fuel injection nozzle ( 4 ), wherein the guiding insert ( 23 ) at least one at areas of the fuel injector ( 4 ) adjoining guide surface ( 24 ) for the fuel injection nozzle ( 4 ), characterized in that the flange connection ( 7 ) at least one flange ( 17 ) with at least one groove ring formed in an end face ( 19 ) arranged seal ( 20 ) and at least one counterflange ( 18 ) with at least one end face, the U-ring ( 19 ) of the flange ( 17 ) associated projection ring ( 22 ), and that the leadership ( 23 ) at least partially a groove wall ( 26 ) of the Nutring ( 19 ), wherein the fuel injection nozzle ( 4 ) at least partially between the U-ring ( 19 ) and the leadership ( 23 ) and in a through a recess in the cylinder head ( 2 ) ( 36 ) is partially managed and / or held. Internal combustion engine ( 1 ) according to claim 1, characterized in that the fuel injection nozzle ( 4 ) in the region of the flange connection ( 7 ), whereby at least one section ( 9 ) of the fuel injection nozzle in the air intake manifold ( 3 ) and at least one other, the ejection opening ( 6 ) section ( 8th ) in the cylinder head ( 2 ) lies. Internal combustion engine ( 1 ) according to one of the preceding claims, characterized in that the air intake manifold ( 3 ) a receiving seat ( 10 ) for the fuel injection nozzle ( 4 ) owns. Internal combustion engine ( 1 ) according to claim 3, characterized in that the receiving seat ( 10 ) a threaded seat ( 11 ). Internal combustion engine ( 1 ) according to claim 3 or 4, characterized in that the receiving seat ( 10 ) in the end area ( 5 ) of the air intake manifold ( 3 ) is arranged. Internal combustion engine ( 1 ) according to claim 5, characterized in that the receiving seat ( 10 ) in the region of the flange connection ( 7 ) is arranged. Internal combustion engine ( 1 ) according to one of the preceding claims, characterized in that the guide insert ( 23 ) into the air intake manifold ( 3 ) fitted inner tube ( 29 ), wherein the air intake manifold ( 3 ) a recording ( 28 ) for the leadership ( 23 ) owns.

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