EP2841757B1 - Arrangement with a fuel distributer and a retaining element - Google Patents

Description

State of the art

The invention relates to an arrangement with a fuel distributor and a holder, which serves for fastening the fuel distributor to a mounting structure, in particular an internal combustion engine. Specifically, the invention relates to the field of fuel injection systems for high pressure injection in internal combustion engines.

From the DE 10 2005 009 740 A1 a fuel injector is known. The known fuel injection device is characterized by a sound-decoupling design. In this case, a fuel distributor line is fastened by means of connecting means to a cylinder head of an internal combustion engine. In the region of the connecting means in this case at least one damping disc is provided. Such damping discs can be arranged in the region below a screw head of the connecting means with a support directly to the fuel rail or with a support directly to the cylinder head, so that the high pressure injection system consisting of the fuel rail and several fuel injection valves towards the cylinder head even more decoupled and better soundproof.

From DE 10 2005 009 740 A1 known fuel injection device has the disadvantage that in the field of attachment of the fuel rail to the cylinder head via a tightening torque of the connecting means a significant load of the damping discs may occur, which leads to premature fatigue over the life. On the other hand, if the tightening torque is too weak, inadequate damping and, due to the resulting play of movement, premature wear, in particular in the fastening area, can occur.

From the DE 10 2008 044 165 A1 Another fuel injection device is known in which a multi-layer damping element is provided between the housing of the fuel distributor and the mounting structure.

From the DE 10 2009 0147 399 B3 It is known to connect a manifold of a fuel rail with a fastener cohesively, for example by welding.

Disclosure of the invention

The arrangement according to the invention with the features of claim 1 has the advantage that an improved vibration damping over the life is guaranteed. Specifically, there is the advantage that a sufficient noise attenuation is ensured even after a long period of operation.

The measures listed in the dependent claims advantageous developments of the arrangement specified in claim 1 are possible.

The arrangement allows the attachment of the fuel distributor to a mounting structure, in particular an internal combustion engine. The mounting structure or the internal combustion engine is not necessarily part of the arrangement and the arrangement can be manufactured and sold separately from such a mounting structure or internal combustion engine. Specifically, the arrangement is suitable for air-compressing, self-igniting internal combustion engines, in which a fuel injection takes place via a plurality of high-pressure injection valves. The fuel distributor is in this case connected in a suitable manner with the injection valves. The fuel distributor may advantageously also serve as a fuel storage, which stores a certain amount of high-pressure fuel. The fuel is in this case first compressed via a high-pressure pump and quantity-controlled promoted via a high-pressure line in the fuel distributor.

In operation, there is the problem that the fuel distributor can be excited to vibrations in the audible frequency range. This happens mainly due to noise sources in the high pressure injectors. In this case, it is unfavorable if the structure-borne sound propagates from the high-pressure injection valves, for example via rail cups, the fuel distributor and holder, to the mounting structure, from where disturbing noises are emitted, which under certain circumstances can even penetrate into the interior of the vehicle. The mounting structure is usually the cylinder head of an internal combustion engine. However, it can also be an application via spacers or via other connecting elements.

Due to the inventive design of the holder a vibration control decoupling and damping between the fuel distributor and the mounting structure is ensured without the other requirements are violated. The holder is in this case designed as a composite sheet of metallic layers and one or more elastically deformable damping layers or comprises such a composite sheet.

Thus, the holder can be configured in an advantageous manner as a sheet-metal holder. The vibrational decoupling results from the composite of the first layer, the elastically deformable damping layer and the second layer. In this case, the first layer, the damping layer and the second layer can be connected to one another in an adhesive-bonded manner in an advantageous manner.

The holding body can be suitably connected to the mounting structure, in particular a cylinder head. In this case, fastening means, in particular screws, can be used. On the holder suitable Anschraubstellen be provided for this purpose, which are realized for example by drilling in the holder.

The holding body allows a decoupling and isolation of the noise sources and vibrations at the fuel distributor relative to the mounting structure. These two effects reduce the sound and sound transmission from the fuel rail to the engine.

In this case, a mechanical action principle for vibration reduction can be realized in an advantageous manner. Between the first layer and the second layer, the damping layer can be laminated. The damping layer may in this case preferably be configured as a thin damping layer. Here, it is also advantageous that the damping layer is formed of a viscoelastic material. In particular, the damping layer may be configured as an elastomer layer. During a relative movement of the first layer and the second layer, the elastically deformable damping layer arranged therebetween is stressed dynamically, so that a high proportion of vibration energy is dissipated by the material damping of the material of the elastically deformable damping layer. The dissipation of structure-borne sound energy thus leads to a damping of vibration forms of the fuel distributor and to a reduction of further structure-borne sound components which could be transmitted via the holder from the fuel distributor into the mounting structure. This results in a decoupling and insulation of the fuel distributor relative to the mounting structure.

The properties of the elastically deformable damping layer can be adjusted by the thickness and the material properties of the material for the damping layer. Possible parameters for this are the frequency contents to be damped and the ambient and operating temperature. It is also conceivable a multi-layered design with multiple layers, each at least substantially of a metallic material are formed and disposed therebetween elastically deformable damping layers. Here also different materials can be used. Specifically, the elastically deformable damping layer or the elastically deformable damping layers can be formed from a viscoelastic material.

Since the decoupling can be realized essentially on the design of the holder, there is a high degree of freedom in the design of the fuel distributor or for the mounting structure. This results in a broad field of application.

In the embodiment of the holder several versions are possible. In a preferred embodiment, the holder consists of exactly two metallic layers and exactly one elastically deformable damping layer, which is arranged between the metallic layers.

According to another possible embodiment, more than two metallic layers, in particular three metallic layers, are provided. Between these metallic layers is then in each case an elastically deformable damping layer. Thus, at least two elastically deformable damping layers are provided.

The holder may also have other constituents in addition to the metallic layers and the elastically deformable damping layer or the elastically deformable damping layers. Specifically, it is possible that the holder is provided with a suitable coating for protection against the environment.

The holding body is connected to the fuel distributor by welding. Several configurations are possible for this joining concept. By designing one or more welded joints, in contrast to a soldering, it can be ensured that the elastically deformable damping layer is not destroyed by the influence of temperature. Specifically, by laser welding, the introduction of heat into the elastically deformable damping layer can be avoided or even completely prevented if necessary. Welds, in particular laser seams, can be applied directly in the region of the contact points. Optionally, a local deterioration of the properties of the damping layer can be accepted by the temperature effect during welding. However, in order to avoid the leakage of liquefied material forming the elastically deformable damping layer, under high temperature effect, an advantageous embodiment is possible in which in the region of the welding position or welding positions, the elastic deformable damping layer in the connection area is removed before welding or this area is released from the outset. Thus, spills and gases occurring when leaking liquefied or thermally damaged material can be avoided. When removing one or more elastomer layers, one or more of the metallic layers in the connection region are preferably removed. The removal can be done for example by separation in conjunction with a bending and / or stamping step. Depending on the application, the holder can also be aftertreated in the connection region, in particular cleaned, in order to prevent the remaining of the material of the elastically deformable damping layer in the connection region.

Thus, it is advantageous that the holding body is connected to the fuel distributor by laser welding. Furthermore, it is advantageous that an outer side of the holding body facing the fuel distributor is formed at least in a connection region of the welded connection between the holding body and the fuel distributor on the first layer and that the first layer of the holding body is connected to the fuel distributor by welding, in particular laser welding. According to an advantageous embodiment, the elastically deformable damping layer and the second layer are recessed in the connection region. As a result, liquefaction or vaporization of the material of the damping layer can be prevented from the outset when joining by welding. Thus, the process reliability is improved.

Advantageously, the first layer of the holding body is configured as an outer first layer. In a possible embodiment, the second layer of the holding body is also designed as an external second layer. The first layer and the second layer thus form the mutually remote outer sides of the holding body.

In a further possible embodiment, it is advantageous that the holding body has at least one third layer, which is at least substantially formed of a metallic material, and at least one further elastically deformable damping layer, that the second layer of the holding body is designed as an inner second layer and the further elastically deformable damping layer is arranged between the inner second layer and the third layer. In this embodiment, a plurality of damping layers can thus be provided in the composite.

The metallic layers may be formed of the same metallic material. However, an embodiment of different metallic materials or only partially the same metallic materials is possible. Furthermore, the elastic deformable damping layers advantageously be made of the same material, in particular a viscoelastic material. However, the elastically deformable damping layers can also be formed from different materials.

As a viscoelastic material for the damping layer may advantageously serve a rubber. The term rubber is to be understood generally and includes not only synthetic rubber materials but also the design of a natural rubber. Furthermore, polymers can be used as the material for the damping layer. Particularly suitable polymers are thermoplastic elastomers. As a polymer, however, can also serve a pure thermoplastic, but has a poorer damping behavior, but a better durability or resistance. Depending on the application, a combination of these materials may be advantageous. This can be achieved, for example, by an embodiment having a plurality of damping layers.

Advantageously, the holding body is designed at least approximately strip-shaped. Here, the holding body may be connected via a one-sided screw with the mounting structure. In this embodiment, the arrangement preferably has a plurality of such holders in order to ensure a stable attachment of the fuel distributor to the mounting structure. In addition, a two-sided screwing of the holding body is possible, in which the holding body, for example, extends over the fuel distributor, so that in the mounted state, the fuel distributor between two provided for the holding body fastening means, in particular screws, is. Also in this embodiment, it is advantageous that the arrangement has a plurality of such holders. Also, a combination of one-sided screwed holders and both sides screwed holders is possible.

It is also advantageous that the fuel distributor is configured as a fuel distributor strip, that the holding body is connected along a longitudinal axis of the fuel distributor with the fuel distributor and that on the holding body fastening tabs are designed, on which the holding body can be fastened to the mounting structure. In this way, in particular designed as a bridge holder holding body can be realized. Here, a screw-on point can be realized on each fastening tab. Depending on the application, the number of fastening straps can also be greater than the number of fastening straps required for fastening. As a result, a configuration for different Anschraubbilder is possible.

It is also advantageous that the fuel distributor at least in a connection region of the welded joint between the holding body and the fuel distributor has an outer side, which is not configured, and that the holding body is formed at least in the connecting region on the non-planar exterior of the fuel distributor. As a result, a configuration of the holder which is partially formed with respect to the outside of the fuel distributor can be achieved in order to enable a larger contact surface. In this case, the length of the enclosing weld can be extended and a better dimensional stability of the arrangement can be achieved.

Thus, a number of advantages can be achieved in the arrangement, which may include one or more holders, in combination with the direct welding of the holder or the holder with the holding body depending on the configuration.

The noise transmission from the fuel distributor, in particular a fuel distributor strip, into the mounting structure, in particular the internal combustion engine, is reduced.

Vibrations of the fuel distributor can be attenuated more, whereby the sound radiation decreases from the outside of the fuel distributor.

The vibration load of the fuel distributor and the high-pressure injection valves due to the vibration load of the internal combustion engine can be reduced, since the vibration transmission is attenuated in this direction. This also provides advantages in terms of design and reliability of these components.

The configuration of the arrangement requires no additional items. The holder can above all be bolted directly to the cylinder head and, in contrast to the use of elastomeric isolators made of solid material, does not require any limitation of the prestress which limits the prestressing of the elastomeric insulator.

The cushioning layer may be very resistant to abrasion due to possible vulcanization in the manufacture of the composite. Due to the planar design of the damping layer loads are distributed over a large area, while immediately a high damping effect is achieved.

In addition, the holder can be shaped arbitrarily within certain limits. This allows adaptation to different geometric requirements.

In addition, assembly and service concepts can be maintained during manufacture or in a workshop with little or no adjustment.

Brief description of the drawings

• Fig. 1 eine Anordnung mit einem Brennstoffverteiler und einem Halter, der zum Befestigen des Brennstoffverteilers an einer Anbaustruktur dient, sowie einem mit dem Brennstoffverteiler verbundenem Einspritzventil in einer auszugsweisen, schematischen Schnittdarstellung entsprechend einem ersten Ausführungsbeispiel der Erfindung;
• Fig. 2 einen Halter der in Fig. 1 dargestellten Anordnung in einer auszugsweisen, schematischen Schnittdarstellung entsprechend einem zweiten Ausführungsbeispiel der Erfindung;
• Fig. 3 einen Halter und einen Brennstoffverteiler der in Fig. 1 dargestellten Anordnung in einer auszugsweisen, schematischen Schnittdarstellung entsprechend einem dritten Ausführungsbeispiel der Erfindung;
• Fig. 4 die in Fig. 1 dargestellte Anordnung in einer schematischen Darstellung entsprechend einem vierten Ausführungsbeispiel der Erfindung;
• Fig. 5 die in Fig. 4 dargestellte Anordnung in einer schematischen Darstellung entsprechend einem fünften Ausführungsbeispiel der Erfindung;
• Fig. 6 die in Fig. 4 dargestellte Anordnung in einer schematischen Darstellung entsprechend einem sechsten Ausführungsbeispiel der Erfindung;
• Fig. 7 die in Fig. 3 dargestellte Anordnung in einer auszugsweisen, schematischen Schnittdarstellung entsprechend einem siebten Ausführungsbeispiel der Erfindung;
• Fig. 8 die in Fig. 3 dargestellte Anordnung in einer auszugsweisen, schematischen Schnittdarstellung entsprechend einem achten Ausführungsbeispiel der Erfindung und
• Fig. 9 die in Fig. 3 dargestellte Anordnung in einer auszugsweisen, schematischen Schnittdarstellung entsprechend einem neunten Ausführungsbeispiel der Erfindung.

Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with identical reference numerals. It shows:

• Fig. 1 an arrangement with a fuel distributor and a holder, which serves for fastening the fuel distributor to a mounting structure, as well as an injection valve connected to the fuel distributor in an extractable, schematic sectional view according to a first embodiment of the invention;
• Fig. 2 a holder of in Fig. 1 arrangement shown in a partial, schematic sectional view according to a second embodiment of the invention;
• Fig. 3 a holder and a fuel distributor of the Fig. 1 arrangement shown in a partial, schematic sectional view according to a third embodiment of the invention;
• Fig. 4 in the Fig. 1 illustrated arrangement in a schematic representation according to a fourth embodiment of the invention;
• Fig. 5 in the Fig. 4 illustrated arrangement in a schematic representation according to a fifth embodiment of the invention;
• Fig. 6 in the Fig. 4 illustrated arrangement in a schematic representation according to a sixth embodiment of the invention;
• Fig. 7 in the Fig. 3 illustrated arrangement in a partial, schematic sectional view according to a seventh embodiment of the invention;
• Fig. 8 in the Fig. 3 illustrated arrangement in a partial, schematic sectional view according to an eighth embodiment of the invention and
• Fig. 9 in the Fig. 3 illustrated arrangement in an excerpt, schematic sectional view according to a ninth embodiment of the invention.

Embodiments of the invention

Fig. 1 shows an arrangement 1 with a fuel distributor 2 and at least one holder 3, which serves for fastening the fuel distributor 2 to a mounting structure 4, in an excerpt, schematic sectional view according to a first embodiment.

The arrangement 1 can in particular be configured as a fuel injection system 1 and serve for high-pressure injection in internal combustion engines. The mounting structure 4 may be an internal combustion engine 4, in particular a cylinder head 4 of an internal combustion engine 4.

The holder 3 has in this embodiment a holding body 5 and a fastening means 6. The fastening means 6 can be configured in particular as a screw 6. About the holder 3, the fuel distributor 2 is fixed with respect to the mounting structure 4 stationary. At the same time, injection valves 7, in particular high-pressure injection valves 7, which are connected to the fuel distributor 2 can also be fixed.

The holding body 5 has in this embodiment, a first layer 8, which is formed of a metallic material, a second layer 9, which is also formed of a metallic material, and an elastically deformable damping layer 10. The elastically deformable damping layer 10 is preferably formed of a viscoelastic material. In this embodiment, an outer side 11 of the holding body 5, which faces the fuel distributor 2, is configured on the first layer 8. An outer side 12 facing away from the outer side 12 of the holding body 5 is configured on the second layer 9. In this embodiment, the first layer 8 is thus configured as an outer first layer 8. The second layer 9 is designed as an outer second layer 9. The damping layer 10 is arranged between the two layers 8, 9. The damping layer 10 is an inner damping layer 10. The damping layer 10 is preferably connected to the metallic layers 8, 9 in a materially bonded manner. For example, the compound of the damping layer 10 with the layers 8, 9 can be made by vulcanization. Thus, the holding body 5 is configured as a composite of the metallic layers 8, 9 and the damping layer 10.

The holding body 5 of the holder 3 is connected to the fuel distributor 2 by welding. Preferably, laser welding is used here. In this exemplary embodiment, the holder 3 is connected to the fuel distributor 2 by means of two weld seams 13, 14 configured by laser welding. Depending on the configuration, welds 15, 16 can also be provided in lateral contact areas, as can be seen from FIGS Fig. 4 is illustrated.

In a connecting region 20, in which the holding body 5 is connected to the fuel distributor 2 by laser welding, local heating of the holding body 5 occurs. In this embodiment, the properties of the damping layer 10 can thereby locally change. Preferably, the holding body 5 is welded to the fuel distributor 2 so that the first layer 8 of the holding body 5 is connected to the fuel distributor 2 by welding, wherein the welds 13, 14 form only with respect to the first layer 8.

In this embodiment, the fuel distributor 2 facing the outer side 11 of the holding body 5, in particular in the connecting portion 20 of the welded joint between the holding body 5 and the fuel distributor 2, formed on the first layer 8. Outside the connection region 20, the outer side 11 may optionally also be formed on a protective layer or the like.

Fig. 2 shows a holder 3 of in Fig. 1 illustrated arrangement 1 in an excerpt, schematic sectional view according to a second embodiment. In this embodiment, the holding body 5, a third layer 21 which is formed of a metallic material, and a further elastically deformable damping layer 22. In this embodiment, the second layer 9 is configured as an inner second layer 9. The further elastically deformable damping layer 22 is arranged between the inner second layer 9 and the third layer 21. The outer side 12 of the holding body 5 is formed on the third layer 21. The third layer 21 is configured as an external third layer 21. The further elastically deformable damping layer 22 is preferably bonded to the second layer 9 and the third layer 21. As a result, a composite of the metallic layers 8, 9, 21 and the damping layers 10, 22 is formed in an advantageous manner.

In a corresponding manner, it is also possible to form a composite of more than three metallic layers 8, 9, 21 and more than two damping layers 10, 22.

Fig. 3 shows the in Fig. 1 illustrated arrangement 1 with a holder 3 and a fuel distributor 2 in an excerpt, schematic sectional view corresponding to a third embodiment. In this exemplary embodiment, the elastically deformable damping layer 10 and the second layer 9 are recessed in the connection region 20. In this way, a recess 23 is formed in the holding body 5, which is illustrated by the broken line represented. The connection of the holder 3 to the fuel distributor 2 is effected by welding the first layer 8 of the holding body 5 to the fuel distributor 2 in the connection region 20. This causes a local heating of the first layer 8. Since the damping layer 10 is recessed in the connection region 20, a liquefaction of the damping layer 10 is prevented from the outset. The formation of splashes or vapors is also prevented. This improves the manufacturing process. In addition, the process reliability is improved.

Fig. 4 shows the in Fig. 1 illustrated arrangement 1 from the designated IV viewing direction in a schematic representation according to a fourth embodiment. The holding body 5 of the holder 3 is designed strip-shaped in this embodiment. Here, the holding body 5 has a passage opening 24, through which the fastening means 6, in particular the screw 6, for fastening to the mounting structure 4, is guided. As a result, a one-sided attachment, in particular a one-sided screw, given to the holder 3. In this embodiment, further holders 3A, 3B are preferably provided, which are designed according to the holder 3. Holding bodies 5A, 5B of the holders 3A, 3B likewise have through openings 24A, 24B in order to enable attachment to the mounting structure 4 via suitable fastening means. In this embodiment, the further holders 3A, 3B are also configured with strip-shaped holding bodies 5A, 5B.

Fig. 5 shows the in Fig. 4 illustrated arrangement 1 in a schematic representation according to a fifth embodiment. In this embodiment, the holding body 5 of the holder 3, on the one hand, the through hole 24 and on the other hand, a through hole 25. The connection of the holding body 5 with the fuel distributor 2 in this case takes place between the passage openings 24, 25. This is a two-sided attachment, in particular two-sided screw, the holder 3 with the mounting structure 4 possible. In this embodiment, further holders 3A, 3B are preferably provided. These holders 3A, 3B can be made according to the in Fig. 5 be illustrated holder 3 configured. In this embodiment, the holding body 5A through openings 24A, 25A. The holding body 5B of the holder 3B has through holes 24B, 25B.

However, the arrangement 1 may also have differently configured holder. Also, a combination of unilaterally screwed or screwed holders and two-sided screwed or screwed holders is possible.

The fuel distributor 2 can in particular be designed as a fuel distributor strip 2 with a longitudinal axis 30. The holding bodies 5, 5A, 5B are then oriented in the projection, preferably perpendicular to the longitudinal axis 30.

Fig. 6 shows the in Fig. 4 illustrated arrangement 1 in a schematic representation according to a sixth embodiment. In this exemplary embodiment, the fuel distributor 2 is configured as a fuel distributor strip 2 with a longitudinal axis 30. The holding body 5 of the holder 3 is connected to the fuel distributor 2 along the longitudinal axis 30 of the fuel distributor 2. Further, fastening tabs 31, 32, 33 are configured on the holding body 5, on which the holding body 5 can be fastened to the mounting structure 4. For attachment, the fastening tabs 31 to 33 through openings 24, 25, 34. In this case, exactly one passage opening 24, 25, 34 is provided on each fastening lug 31 to 33 in this exemplary embodiment.

The composite of the metallic layers 8, 9 and the damping layer 10 can thus be designed in a suitable manner. This can be done by a suitable blank in a simple way adapt to different Anschraubbilder.

Fig. 7 shows the in Fig. 3 illustrated arrangement 1 with a holder 3 and a fuel distributor 2 in an excerpt, schematic sectional view corresponding to a seventh embodiment. The fuel distributor 2 has an outer side 4 which, among other things, is not designed evenly in the connection region 20. In this embodiment, the outer side 40 is formed in the connecting portion 20 in the form of a segment of a cylinder jacket. The holding body 5 is integrally formed in the connecting region 20 to the bent outer side 40 of the fuel distributor 2. As a result, a larger bearing surface between the holding body 5 and the fuel distributor 2 is achieved. As a result, the possibility for the design of a lateral weld 16 is improved. In this embodiment, the weld seam 16 can thereby be designed in a circular shape, whereby it ensures a connection between the holding body 5 and the fuel distributor 2 over the entire length.

Fig. 8 shows the in Fig. 3 illustrated arrangement 1 in an excerpt, schematic sectional view corresponding to an eighth embodiment. In this embodiment, the second layer 9 faces the mounting structure 4. Furthermore, the second layer 9 is recessed in the region of the fuel distributor 2. Likewise, the damping layer 9 is recessed in the region of the fuel distributor 2. The first layer 8 is connected by welds 13, 14 with the fuel distributor 2.

The attachment has the advantage that the fuel distributor 2 is connected to the layer 8, which does not bear directly against the mounting structure 4. Because the layer 8 is separated from the voltage applied to the mounting structure 4 layer 9 by the damping layer 10. Thus, the vibration damping can be further improved.

Furthermore, the fastening means 6 is designed as a collar screw 6. The collar screw comprises a head 45, a collar 46 and a threaded bolt 47. The threaded bolt is screwed into the mounting structure 4. By a height of the collar 46, the bias, which acts on the damping layer 10, limited and defined predetermined. In addition, the collar 46 abuts the layer 9, which is supported on the mounting structure 4. Thus, a high fastening force with respect to the layer 9 can be achieved, which can be significantly greater than the biasing force acting on the damping layer 10.

In a modification, the collar 46 may also rest directly on the mounting structure. The fastening force and the biasing force acting on the damping layer 10, however, are then the same size.

Fig. 9 shows the in Fig. 3 illustrated arrangement 1 in an excerpt, schematic sectional view according to a ninth embodiment. In this exemplary embodiment, the holder 3 is screwed to the mounting structure 4 with a fastening means 6 designed as a screw 6. Here, a support sleeve 48 is provided which defines a defined distance of the head 45 of the mounting structure 4 when screwing. As a result, a fastening force and thus a bias of the damping layer 10 are given.

Further, the layer 9 is applied to the mounting structure 4, while the layer 10, with which the fuel distributor 2 is connected by a weld 15, does not directly abut the mounting structure. Because the layer 8 rests against the mounting structure 4 only by means of the damping layer 10 and the layer 9. Thus, an advantageous damping is achieved.

The invention is not limited to the described embodiments.

Claims (9)

1. Assembly (1), in particular a fuel-injection system for high-pressure injection in internal combustion engines, having a fuel distributor (2) and at least one holder (3) which serves for fastening the fuel distributor (2) to an installation structure (4),
   characterized in that
   the holder (3) has a holding member (5), in that the holding member (5) has a first layer (8) which is at least substantially formed from a metallic material, at least one second layer (9) which is at least substantially formed from a metallic material, and at least one elastically deformable damping layer (10), in that the elastically deformable damping layer (10) is disposed between the first layer (8) and the second layer (9), and in that the holding member (5) is connected to the fuel distributor (2) by welding, wherein an external side (11) of the holding member (5) that faces the fuel distributor (2) is configured on the first layer (8) at least in a connection region (20) of the welded connection between the holding member (5) and the fuel distributor (2), and in that the first layer (8) of the holding member (5) is connected to the fuel distributor (2) by welding, and wherein the holding member (5) represents a composite sheet.
2. Assembly according to Claim 1,
   characterized in that
   the holding member (5) is connected to the fuel distributor (2) by laser welding.
3. Assembly according to Claim 1,
   characterized in that
   the elastically deformable damping layer (10) and the second layer (9) are cleared in the connection region (20).
4. Assembly according to one of Claims 1 to 3,
   characterized in that
   the first layer (8) of the holding member (5) is designed as an outer first layer (8).
5. Assembly according to Claim 4,
   characterized in that
   the holding member (5) has at least one third layer (21) which is at least substantially formed from a metallic material, and at least one further elastically deformable damping layer (22), in that the second layer (9) of the holding member (5) is designed as an inner second layer (9), and that the further elastically deformable damping layer (22) is disposed between the inner second layer (9) and the third layer (21).
6. Assembly according to one of Claims 1 to 5,
   characterized in that
   the holding member (5) is designed in an at least approximately strip-shaped manner.
7. Assembly according to one of Claims 1 to 5,
   characterized in that
   the fuel distributor (2) is designed as a fuel distribution rail (2), in that the holding member (5) along a longitudinal axis (30) of the fuel distributor (2) is connected to the fuel distributor (2), and in that fastening tabs (31 - 33) on which the holding member (5) is fastenable to the installation structure (4) are designed on the holding member (5).
8. Assembly according to one of Claims 1 to 7,
   characterized in that
   the fuel distributor (2) at least in a connection region (20) of the welded connection between the holding member (5) and the fuel distributor (2) has an external side (40) which is designed so as not to be planar, and in that the holding member (5) at least in the connection region (20) is moulded to the external side (40) of the fuel distributor (2) that is designed so as not to be planar.
9. Assembly according to one of Claims 1 to 8,
   characterized in that
   the elastically deformable damping layer (10, 22) is formed from a visco-elastic material.

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