EP2640956B1 - Fastening arrangement of a fuel supply device on an internal combustion engine - Google Patents

Description

The invention relates to a fastening arrangement of a fuel supply device to an internal combustion engine according to the preamble of patent claim 1.

The WO 2006/105388 A1 discloses a fuel rail including an elongated tubular body having a wall defining a cavity therethrough. The elongate tubular body is formed of a thermosetting composite material. The fuel rail includes a pressure port having a cavity fluidly connected to the lumen of the elongate tubular body. The fuel rail may further include a layer over which the elongated tubular body is overmolded and which completely surrounds at least one outer peripheral portion of the elongate tubular body. With the overmolded layer, a connecting element is then connected, via which the fuel rail is to be connected to a motor.

Of the DE 101 03 250 A1 a pipe for a diesel engine is known to be known, which comprises a main pipe with a circumferential passage which extends in its interior in the axial direction. The conduit further includes branch bores formed in a peripheral wall part of the main piping. In addition, the conduit includes branching terminals which are connected to the corresponding branching holes integrally or via separate connection elements. The lead further comprises a nickel diffused reinforcing layer for increasing the fatigue strength formed by heating a nickel layer previously plated by applying pure nickel or a nickel alloy formed on at least a part of the inner circumferential surface of the common lead becomes.

The WO 97/30282 A1 discloses an intake manifold for the supply of air to an internal combustion engine with a fuel rail, wherein the fuel rail is secured with a male or snap or snap connection to the intake manifold.

Of the EP 2 072 806 A1 a mounting arrangement comprising a fuel supply device and an internal combustion engine is to be taken as known, in which at least one extending along a longitudinal direction fuel distribution element is attached to the internal combustion engine by means of at least one connecting part. The connecting part is connected to the fuel distribution element via a receiving part, which has a receptacle which completely surrounds at least an outer circumferential region of the fuel distribution element and in which at least a portion of the fuel distribution element is accommodated.

From the DE 10 2009 014 399 B3 a fastening arrangement comprising a fuel supply device and an internal combustion engine is known in which at least one along a longitudinal direction and at least two connection openings for connecting a respective fuel injection device having fuel distribution element is attached to the internal combustion engine by means of at least one connecting part. The connecting part is connected to the fuel distribution element via a receiving part, which has a receptacle which completely surrounds at least an outer circumferential region of the fuel distribution element and in which at least a portion of the fuel distribution element is accommodated.

In this case, a location of the fuel distribution element located in the extension direction of the connecting part lies on a straight line connecting the two connection openings.

The connecting part has at least one arranged on the side of the fuel distribution element and at least partially covered with respect to the receiving part arranged support surface on which a fastening means for securing the connecting part to the internal combustion engine can be supported.

Furthermore, goes from the JP 201 019132 A a fastening assembly comprising a fuel supply device and an internal combustion engine in which a fuel distribution member extending along a longitudinal direction is fixed to an internal combustion engine.

Finally, the reveals US Pat. No. 6,405,711 B1 a fastening arrangement comprising a fuel supply device and an internal combustion engine, wherein at least one along a longitudinal direction and at least two connection openings for connecting a respective fuel injection device having fuel distribution element is attached to the internal combustion engine by means of at least one connecting part.

These known solutions have the disadvantage that during operation, in which fuel is injected under high pressure into combustion chambers of an internal combustion engine, an undesirably high loading of the fuel distributor pipe or the line occurs, as a result of which they can separate from the internal combustion engine.

It is therefore an object of the present invention to provide a mounting arrangement of a fuel supply device to an internal combustion engine, which allows an improved attachment of the fuel supply device to the internal combustion engine.

This object is achieved by a fastening arrangement of a fuel supply device to an internal combustion engine having the features of patent claim 1.

The invention relates to a fastening arrangement of a fuel supply device to an internal combustion engine, in which at least one fuel distribution element running along a longitudinal direction is fastened to the internal combustion engine by means of at least one connecting part. The fuel distribution element has at least two connection openings, which make it possible to connect a respective fuel injection device, for example an injector, a fuel injection valve or the like, to the fuel distribution element, so that fuel to be received in the fuel distribution element flows via the connection openings to the fuel injection devices and via these into combustion chambers Internal combustion engine can be injected. The connecting part is connected to the fuel distribution element via a receiving part, which has a receptacle, the at least one Completely surrounds the outer peripheral portion of the fuel distribution element and in which at least a portion of the fuel distribution element is received.

A location of the fuel distribution element located in the extension direction of the connecting part in extension lies on a straight line connecting the two connection openings. The connecting part has, for example, a main extension direction, in particular a longitudinal main extension direction. In an extension along the extension direction or along the main extension direction of the connecting part results in an intersection with the fuel distribution element, in particular with an outer circumferential side surface thereof, wherein the intersection is located on the two connecting openings connecting straight line. Preferably, the straight line connects respective centers of the preferably circular connection openings.

As a result of this arrangement of the location of the fuel distribution element on the straight occur during operation of the fuel supply device in which the fuel is injected at high pressures in combustion chambers of the internal combustion engine, no or very little lateral forces and / or transverse moments (torsional moments) at connection points of the connecting part with the fuel distribution element and at junctions of the fuel supply device with the internal combustion engine, which would stress the joints heavily. Rather, occur during operation advantageously at least almost only normal forces, which can be very well received and supported by the fuel supply device and / or the internal combustion engine. Thus, the fastening arrangement according to the invention allows a particularly firm connection of the fuel supply device with the internal combustion engine, which persists even at high forces due to high injection pressures and a long service life, without the fuel supply device detached from the internal combustion engine.

In addition, the fastening arrangement has the advantage that fastening elements such as sleeves, which are inserted through the fuel distribution element, as well as corresponding passage openings, through which these fastening elements can penetrate the fuel distribution element, are not provided. In such pushed fasteners can during the operation of the fuel supply device optionally form cracks and thus leakage points, if no appropriate precautions are taken. This danger exists in particular in edge regions of passage openings through which the fastening elements penetrate the fuel distribution pipe. A probability of such crack and leakage formation is particularly low in the fastening arrangement according to the invention. The fastening arrangement is therefore very robust against high loads and has very low costs.

The connecting part has at least one support surface arranged on the side of the fuel distribution element, to which a fastening means for fastening the connecting part to the internal combustion engine can be supported. The fastening means is, for example, a screw, by means of which the connecting part or the further connecting part with the internal combustion engine, in particular the cylinder head, is screwed.

The screw can be supported on the support surface via its screw head, so that the connecting part or the further connecting part is clamped to the internal combustion engine and thus screwed to this. It is advantageously provided that the support surface is arranged at least partially, in particular at least predominantly and in particular completely, without cover with respect to the receiving part. As a result, the fastening means, in particular the screw, are fastened, in particular tightened, for example by means of a tool from the side of the fuel distribution element and thus from the side of the receiving part. the at least bereisweise cover-free arrangement of the support surface thus allows a particularly simple and thus time and cost assembly of the fuel distribution element to the internal combustion engine.

To illustrate the at least regional coverage of the support surface and thus to illustrate the particularly simple assembly include the extension direction and the surface normal of the support surface according to the invention a different angle from 0 °. Advantageously, the angle between the direction of extent and the surface normal is greater than 0 ° and less than or equal to 12 °.

In an advantageous embodiment, the connecting part is arranged in the longitudinal direction of the fuel distribution element between the connection openings and in particular at least substantially in the middle between the connection openings, whereby bending moments are at least substantially avoided or only very low bending moments occur. This also keeps the burden of the corresponding connection points low, which is beneficial to the long life of the mounting arrangement.

In a further embodiment, the connecting part has a central axis, in particular a longitudinal center axis, which intersects the fuel distribution element, in particular the outer lateral surface of the fuel distribution element, at a point of the fuel distribution element at an intersection, said point of intersection on which the two connection openings, in particular their midpoints , connecting straight line lies. As a result, eccentric forces and resulting moments can be avoided or at least kept very low, which keeps the loads of the joints low.

If the connecting part and the connection openings are arranged on a common side of the fuel distribution element, this results in the advantage that at least substantially only tensile forces must be absorbed by the at least one connecting part during operation of the fuel supply device, for example, to the fuel supply device on the internal combustion engine a cylinder head this, to hold. Traction forces can be particularly well received and supported by the internal combustion engine, the connecting part and the fuel distribution element, in particular as a result of the fact that the receptacle of the receiving part completely surrounds the fuel distribution element on the outer circumference, so that the fuel supply device and the internal combustion engine are only slightly loaded during operation. This also benefits the life of the mounting arrangement.

In a further embodiment, a longitudinal center axis of the fuel distribution element, which is for example elongate and tubular, lies in a plane which is spanned by the straight line and the extension direction of the connection part. This also causes the fuel distribution element during operation of the fuel supply device at least essentially no torsional moments and eccentric forces act. The forces acting on the fuel distribution element are at least substantially only normal forces, in particular tensile forces, which can be particularly well received and supported. This also favors a particularly strong and durable attachment of the fuel supply device to the internal combustion engine.

In a particularly advantageous embodiment of the invention, the fastening arrangement comprises at least one further with the first connecting part form-fitting and / or reversibly releasably connected connecting part, by means of which the fuel supply device is attached to the internal combustion engine. This makes it possible to first connect the fuel distribution element with the first connection part mediation of the recording, and first to connect the other connecting part with the internal combustion engine, for example with the cylinder head. Then, the fuel distribution element and the first connecting part connected thereto can be connected as a module via the already mounted further connecting part with the internal combustion engine.

As a result, a particularly simple, time-consuming and cost-effective installation of the fuel supply device to the internal combustion engine is provided. As a result of the positive and / or reversibly releasable connection of the two connecting parts, wherein no cohesive connection is provided, the fuel supply device, for example, in repair cases can also be dismantled again time and cost. In addition, the avoidance of a cohesive connection to avoid an undesirably high heat input into the connecting parts and in particular in the fuel distribution element, which could result in a delay of the fuel distribution element and / or the connecting parts, which could adversely affect the attachment of the fuel supply device to the internal combustion engine.

The connecting parts are for example at least partially, in particular predominantly rod-shaped, sleeve-shaped or bolt-shaped and arranged coaxially with each other. This allows a particularly precise connection of the connecting parts with each other, as well as the previously described advantageous support of loads occurring during operation, whereby torsional moments are at least substantially avoided. In this case, an axis, to which the connecting parts are aligned coaxially, advantageously intersects the longitudinal center axis of the fuel distribution element to avoid eccentric forces.

In a further embodiment of the invention, the connecting parts by means of a screw, in particular a nut and in particular a nut, connected, which is screwed to one of the connecting parts and supported on the other of the connecting parts via respective stops. The screw member has, for example, a collar, which is supported on a stop of the corresponding connecting part, so as to connect the connecting parts with each other in a form-fitting manner, in particular in its axial direction. The screw makes it possible to connect the connecting parts particularly time-consuming and cost-effective and thus attach the fuel supply device particularly simple, time and cost to the internal combustion engine.

In order to be able to position the two connecting parts exactly relative to one another, one of the connecting parts is preferably accommodated in a receptacle of the other of the connecting parts at least in regions. For this purpose, about one of the connecting parts on a dowel pin, which is formed for example as an extension of the connecting part, while the other of the connecting parts has a corresponding fitting opening as the receptacle in which the dowel pin is received. As a result, the connecting parts can be centered relative to one another in order to promote the previously described support of the loads occurring during operation.

Furthermore, it is advantageous if the connecting part, in particular the further connecting part, at least partially substantially rod-shaped and in the rod-shaped region has a thread, in particular an external thread, via which the connecting part with the internal combustion engine, in particular the cylinder head bolted , is. Thus, the connecting part can be connected to the internal combustion engine in a particularly timely and cost-effective manner, which minimizes the assembly time and the assembly costs for fastening the fuel supply device to the internal combustion engine. In addition, it is thereby possible to connect the connecting part in its axial direction with the internal combustion engine. How to act on the connecting part at least essentially only normal forces, in particular tensile forces. The occurrence of shear forces, in particular as a result of connections or connecting means extending transversely to the connecting part, is thus at least substantially avoided. This benefits the very strong and durable attachment of the fuel supply device to the internal combustion engine.

In a further advantageous embodiment, the connecting part and the receiving part are integrally formed with each other. This keeps the number of parts and thus the cost and weight of the fastening arrangement according to the invention low. The connecting part and the receiving part integrally formed therewith are formed, for example, as a cast component, as a welded component made of a plurality of welding parts welded together, as a soldering component of a plurality of soldered parts soldered together or as a deep-drawn part.

To connect the receiving part and the fuel distribution element particularly firmly together, the receiving part and the fuel distribution element, for example, are materially connected to each other. This also avoids that undesired movement of the receiving part relative to the fuel distribution element is prevented, in particular during pre-assembly of the connecting part with the fuel distribution element via the receiving part.

In a further advantageous embodiment, the integrally formed with the receiving part connecting part is directly connected to the internal combustion engine. It is preferably provided that the connecting part is supported directly on the internal combustion engine, in particular on the cylinder head of the internal combustion engine. This keeps the number of parts and thus the cost of the mounting arrangement particularly low.
The receiving part and the connecting part are formed, for example, as a one-piece cast component, in particular as a so-called cast block. Such a cast component or such a cast block is particularly time-consuming and inexpensive to manufacture. Also, the assembly effort is particularly low, since only the integrally formed with the receiving part connecting part is to be mounted.
Additionally or alternatively, the receiving part on a side facing away from the fuel distribution element outer peripheral side at least one recess have, wherein the support surface is at least partially excluded by means of the recess of the receiving part of an overlap by the receiving part. This means that the advantageous access to the support surface to mount the fastening means, at least partially realized by the recess of an outer peripheral side surface of the receiving part. This has the particular advantage that thereby the angle between the direction of extent and the surface normal held low but at the same time the advantageous access to the support surface can be realized. Thus, the fastening arrangement has only a very small space requirement.

In a method for fastening a fuel supply device having at least one fuel distribution element to a combustion engine running along a longitudinal direction and having at least two connection openings for connecting a respective fuel injection device, in one step of the method the fuel distribution element is connected to at least one connection part via a receiving part having a receptacle, by at least a portion of the fuel distribution element is spent in the receptacle. When spent in the recording fuel distribution element, the receptacle surrounds at least an outer peripheral region of the fuel distribution element in the circumferential direction completely. In a further step, the fuel distribution element is attached to the internal combustion engine, for example on a cylinder head of this, by means of the connecting part.

It is envisaged that when connecting the fuel distribution element with the connecting part in the extension direction of the connecting part in extension of the same located location of the fuel distribution element is arranged such that the point is located on a connecting the two connection openings straight line. Advantageous embodiments of the first aspect of the invention are to be regarded as advantageous embodiments of the second aspect of the invention and vice versa. Characterized in that the point of the fuel distribution element after connecting the same with the connecting part on the connecting the connecting openings straight line is present, occur during operation of the fuel supply device at least substantially no or only very small unwanted Transverse forces and transverse moments (Torsionsmomente) at connection points of the connecting part with the fuel distribution element and / or with the internal combustion engine. Thus, the load on the joints is kept low and the fuel supply device can be particularly firmly connected by means of the method according to the invention with the internal combustion engine, which solid connection is ensured over a long service life of the fuel supply direction away.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and feature combinations mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respectively specified combination but also in other combinations or in isolation, without the scope of To leave invention.

Fig. 1

eine schematische Perspektivansicht einer Kraftstoffzufuhrvorrichtung für eine Verbrennungskraftmaschine, welche Verbindungsteile umfasst, mittels welchen die Kraftstoffzufuhrvorrichtung an einem Zylinderkopf der Verbrennungskraftmaschine zu befestigen ist;

Fig. 2

eine schematische und perspektivische Längsschnittansicht der Kraftstoffzufuhrvorrichtung gemäß Fig. 1;

Fig. 3

ausschnittsweise eine schematische Längsschnittansicht einer Befestigungsanordnung der Kraftstoffzufuhrvorrichtung gemäß den Fig. 1 und 2 an dem Zylinderkopf in einem Bereich einer ersten Verbindungsstelle mit dem Zylinderkopf;

Fig. 4

ausschnittsweise eine weitere schematische Längsschnittansicht der Befestigungsanordnung gemäß Fig. 3 an einer weiteren Verbindungsstelle mit dem Zylinderkopf der Verbrennungskraftmaschine;

Fig. 5

eine schematische Perspektivansicht einer Stiftschraube der Kraftstoffzufuhrvorrichtung gemäß den vorhergehenden Figuren, mittels welcher die Kraftstoffzufuhrvorrichtung an dem Zylinderkopf der Verbrennungskraftmaschine zu befestigen ist;

Fig. 6

eine schematische Perspektivansicht einer Überwurfmutter der Kraftstoffzufuhrvorrichtung gemäß den vorhergehenden Figuren, mittels welcher die Kraftstoffzufuhrvorrichtung an dem Zylinderkopf der Verbrennungskraftmaschine zu befestigen ist;

Fig. 7

eine schematische Perspektivansicht eines Knotenelements der Kraftstoffzufuhrvorrichtung gemäß den vorhergehenden Figuren, mittels welchem die Kraftstoffzufuhrvorrichtung an dem Zylinderkopf der Verbrennungskraftmaschine zu befestigen ist;

Fig. 8

ausschnittsweise eine schematische Perspektivansicht der Befestigungsanordnung gemäß Fig. 3;

Fig. 9

ausschnittsweise eine schematische Perspektivansicht einer weiteren Ausführungsform der Befestigungsanordnung gemäß Fig. 8;

Fig. 10

ausschnittsweise eine schematische Perspektivansicht einer weiteren Ausführungsform der Befestigungsanordnung gemäß den Fig. 8 und 9;

Fig. 11

eine schematische Perspektivansicht einer weiteren Ausführungsform der Befestigungsanordnung gemäß Fig. 8;

Fig. 12

ausschnittsweise eine schematische Längsschnittansicht der Befestigungsanordnung gemäß Fig. 11;

Fig. 13

eine schematische Seitenansicht einer weiteren Ausführungsform der Befestigungsanordnung gemäß Fig. 11;

Fig. 14

eine schematische Draufsicht der Befestigungsanordnung gemäß Fig. 13;

Fig. 15a

eine schematische Perspektivansicht eines Aufnahmeteils und eines Verbindungsteils einer Ausführungsform der Befestigungsanordnung gemäß Fig. 11, wobei das Aufnahmeteil und das Verbindungsteil als einstückiges Gussbauteil ausgebildet sind;

Fig. 15b

eine schematische Draufsicht des Gussbauteils gemäß Fig. 15a;

Fig. 15c

eine weitere schematische Perspektivansicht des Gussbauteils gemäß den Fig. 15a-b;

Fig. 15d

eine weitere schematische Perspektivansicht des Gussbauteils gemäß den Fig. 15a-c; und

Fig. 15e

eine weitere schematische Perspektivansicht des Gussbauteils gemäß den Fig. 15a-d.

The drawing shows in:

Fig. 1

a schematic perspective view of a fuel supply device for an internal combustion engine, comprising connecting parts, by means of which the fuel supply device is to be attached to a cylinder head of the internal combustion engine;

Fig. 2

a schematic and perspective longitudinal sectional view of the fuel supply device according to Fig. 1 ;

Fig. 3

a fragmentary schematic longitudinal sectional view of a mounting arrangement of the fuel supply device according to the Fig. 1 and 2 on the cylinder head in a region of a first joint with the cylinder head;

Fig. 4

in sections, a further schematic longitudinal sectional view of the fastening arrangement according to Fig. 3 at a further connection point with the cylinder head of the internal combustion engine;

Fig. 5

a schematic perspective view of a stud of the fuel supply device according to the preceding figures, by means of which the fuel supply device is to be attached to the cylinder head of the internal combustion engine;

Fig. 6

a schematic perspective view of a union nut of the fuel supply device according to the preceding figures, by means of which the fuel supply device is to be attached to the cylinder head of the internal combustion engine;

Fig. 7

a schematic perspective view of a node element of the fuel supply device according to the preceding figures, by means of which the fuel supply device is to be attached to the cylinder head of the internal combustion engine;

Fig. 8

a schematic perspective view of the fastening arrangement according to FIG Fig. 3 ;

Fig. 9

a schematic perspective view of a further embodiment of the fastening arrangement according to FIG Fig. 8 ;

Fig. 10

a schematic perspective view of a further embodiment of the fastening arrangement according to the 8 and 9 ;

Fig. 11

a schematic perspective view of another embodiment of the fastening arrangement according to Fig. 8 ;

Fig. 12

in sections, a schematic longitudinal sectional view of the fastening arrangement according to Fig. 11 ;

Fig. 13

a schematic side view of another embodiment of the fastening arrangement according to Fig. 11 ;

Fig. 14

a schematic plan view of the fastening arrangement according to Fig. 13 ;

Fig. 15a

a schematic perspective view of a receiving part and a connecting part of an embodiment of the fastening arrangement according to Fig. 11 wherein the receiving part and the connecting part are formed as a one-piece cast component;

Fig. 15b

a schematic plan view of the cast component according to Fig. 15a ;

Fig. 15c

a further schematic perspective view of the cast component according to the Fig. 15a-b ;

Fig. 15d

a further schematic perspective view of the cast component according to the Fig. 15a-c ; and

Fig. 15e

a further schematic perspective view of the cast component according to the Fig. 15a-d ,

The Fig. 1 and 2 show a fuel supply device 10 for an internal combustion engine, in particular a direct-injection gasoline or diesel engine. The fuel supply device 10 includes a fuel rail 12 which extends along a longitudinal direction according to a directional arrow 14. Through the fuel rail 12, an elongated receiving space 16 is formed, in which under very high pressure fuel for the internal combustion engine can be received. For this purpose, the fuel is conveyed by means of at least one pumping device from a fuel tank, mixed under high pressure and conveyed via a connecting part 18 into the receiving space 16 of the fuel rail 12.

On one side 20 of a lateral surface 22 of the fuel rail 12 at least substantially circular connection openings 24 are formed, via which the high-pressure fuel from the receiving space 16 can be removed. Furthermore, valve heads 26 are arranged on the side 20, which communicate fluidically with the receiving space 16 via the connection openings 24. By means of the valve heads 26 injection valves are fluidly connected to the fuel rail 12 and in particular to the receiving space 16 via the connection openings 24, so that the fuel under high pressure flow through the connection openings 24 to the fuel valves and by means of the fuel valves in a respective Cylinder of the internal combustion engine can be injected directly.

The 3 and 4 show a mounting assembly 11 of the fuel supply device 10 on the cylinder head 46. To connect the fuel supply device 10 with the cylinder head 46 of the internal combustion engine, the fuel supply device 10 includes node elements 28 and 28 ', wherein the node element 28 also in the Fig. 7 is shown enlarged. The node elements 28 and 28 'each have a receiving part 30 and 30', through each of which a receptacle 32 and 32 'is formed. The fuel rail 12 is arranged with respective portions in the receptacles 32 and 32 ', wherein the receptacles 32 and 32' the sections and thus the fuel rail 12 circumferentially around the circumferential direction of the fuel rail 12 according to a direction arrow 34 completely surrounded. Integrally formed with the receiving parts 30 and 30 'are connecting parts 36 and 36' of the node elements 28 and 28 '. The connecting parts 36 and 36 'are at least substantially rod-shaped and extend along a longitudinal extension direction according to directional arrows 38 and 38'. The connecting parts 36 and 36 'run at least substantially perpendicular to the fuel rail 12.

Furthermore, the fuel supply device 10 includes stud bolts 40 which are also at least substantially rod-shaped, extending along a respective longitudinal direction according to the directional arrows 38 and 38 'and extend at least substantially perpendicular to the fuel rail 12. The stud bolts 40 each have a threaded portion 42 in which a respective external thread 44 is formed, via which the stud bolts 40 are connected to the cylinder head 46 of the internal combustion engine. For this purpose, the stud bolts 40 are screwed in to the external threads 44 corresponding internal thread of the cylinder head 46. In this way, the stud bolts 40 can be time and cost in the axial direction according to the directional arrows 38 and 38 'connected to the cylinder head 46.

How the particular Fig. 5 can be seen, the stud bolts 40 a tool internal attack, such as a hexagon socket, on, over which the stud bolts 40 can be screwed, for example, with a predetermined torque in the cylinder head 46 by means of a corresponding tool.

In order to connect the node elements 28 and 28 'with the stud bolts 40 and thus secure the fuel supply device 10 to the cylinder head 46, the fuel supply device 10 includes union nuts 48, wherein one of the union nuts 48 in the Fig. 6 is shown larger. The union nuts 48 each have an internal thread 50, via which they are screwed to a respective corresponding external thread 52 and 52 'of the connecting parts 36 and 36'. Furthermore, the union nuts 48 on a collar 54, by means of which they are supported on a corresponding stop 56 of the stud bolts 40 in the axial direction. By screwing the union nuts 48 with the connecting parts 36 and 36 'and by supporting on the studs 40, the connecting parts 36 and 36' with the stud bolts 40 are clamped in the axial direction and thus connected to each other.

As in particular the 3 and 4 can be seen, the connecting parts 36 and 36 'each have a dowel pin 58 and 58', by means of which the connecting parts 36 and 36 'centered relative to the studs 40 and can be arranged coaxially with these precisely. For this purpose, the stud bolts 40 each have a receptacle 60 in which the dowel pins 58 and 58 'are respectively received.

When fastening the fuel supply device 10 to the cylinder head 46, first the union nuts 48 are threaded onto the stud bolts 40, whereupon the stud bolts 40 are screwed into the cylinder head 46. The at least substantially rod-shaped configuration of the stud bolts 40 allows a particularly fast threading the union nuts 48. Before, simultaneously or subsequently, the fuel rail 12 is inserted into the receptacles 32 and 32 ', wherein the node elements 28 and 28' optionally on the fuel rail 12th attached, for example, cohesively, fixed, be. The node elements 28 and 28 'are, for example, castings, forgings, or an assembly of several parts, which are soldered together and / or welded together to form the node elements 28 and 28'.

Subsequently, the dowels 58 and 58 'are placed in the receptacles 60, so that the fuel rail 12 is positioned particularly precisely relative to the stud bolts 40 and the cylinder head 46. After that the union nuts 48 are screwed to the node elements 28 and 28 ', so that the fuel rail 12 in the axial direction of the stud bolts 40 and the connecting members 36 and 36' according to the directional arrows 38 and 38 'on the cylinder head 46 is held particularly firm.

This attachment of the fuel supply device 10 to the cylinder head 46 has the advantages that fasteners such as sleeves, which are inserted through the fuel rail 12 and the receiving space 16 through, and through openings of the fuel rail 12 through which these fasteners can penetrate the fuel rail 12, not provided are. In such plugged fasteners there is a significant probability that during operation of the fuel supply device in which the fuel is injected at high pressures in the cylinder cracks and thus leaks form, if no appropriate precautions are taken. The risk of such a cracking and leakage formation exists in particular in edge regions of passage openings through which the fastening elements such as the sleeves penetrate the fuel rail 12. This means that such a probability of cracking and leakage formation in the fuel supply device 10 is particularly low.

In addition, the stud bolts 40 and the connecting parts 36 and 36 'and the connection openings 24 are arranged on this common side 20 of the fuel rail 12, so that at least substantially only tensile forces on the stud bolts 40, the connecting parts 36 and 36' and the fuel rail 12th Act. These tensile forces can be particularly well absorbed in 360 ° in the circumferential direction of the fuel rail 12 in particular due to the complete enclosure of the receptacles 32 and 32 '.

Furthermore, it is advantageous that the receiving parts 30 and 30 'extend in the longitudinal direction according to the directional arrow 14 over a particularly long and large-area region of the lateral surface 22, so that an undesirably high local force introduction into the fuel rail 12 is not given.

Furthermore, the fuel supply device 10 results in particularly easy-to-control tolerances, since no sealing solder joints or otherwise cohesive connection surfaces are provided. In addition, the fuel supply device 10 has a very small number of divisors, since only the node elements 28 and 28 ', the union nuts 48 and the stud bolts 40 are provided for attaching the fuel supply device 10 to the cylinder head 46.

Another advantage is that in the longitudinal direction of the connecting parts 36 and 36 'according to the directional arrows 38 and 38' in extension thereof located points 62 and 62 'lie on a straight line 64, which the connection openings 24 and in particular centers of the at least substantially circular connection openings 24th connects with each other. In other words, the stud bolts 40 and the connecting members 36 and 36 'have respective longitudinal centerlines 66 and 66' disposed coaxially with each other which intersect the lateral surface 22 in extension thereof at respective intersections which are locations 62 and 62 '. The fact that the points 62 and 62 'lie on the straight line 64, in other words, the stud bolts 40, the connecting parts 36 and 36' and the valve heads 26 in particular in relation to a respective median plane in a common plane. As a result, undesired transverse moments acting on corresponding connection points of the connecting parts 36 and 36 'with the fuel distributor pipe 12 and / or with the stud bolts 40 and / or on corresponding connecting points of the stud bolts 40 with the cylinder head 46 are at least substantially avoided or kept very low. During operation of the fuel supply device 10 act on the joints and on the fuel supply device 10 at least substantially only normal forces, in particular tensile forces. As a result, a particularly firm attachment of the fuel supply device 10 is ensured on the cylinder head 46 also over a long service life. In addition, the center axes 66 and 66 'intersect a longitudinal center axis 68 of the fuel rail 12, so that eccentric forces and moments are at least substantially avoided thereby.

The Fig. 8 shows the connection assembly 11 according to Fig. 3 , As can be seen, the union nut 48 has a tool engagement present in the form of an external hex, over which the union nut 48 can be secured by means of a tool for connecting the receiving part 30 via the connecting part 36 with the stud 40.

The Fig. 9 shows a further embodiment of the fastening assembly 11, in which the stud 40 and the stud bolts 40 are not provided. In the fastening assembly 11 according to Fig. 9 the receiving part 30 and the connecting part 36 are formed integrally with each other, wherein the connecting part 36 is attached directly to the cylinder head 46. This means that the connecting part 36 without mediation, ie without the mediation of the stud 40, is attached to the cylinder head 46. In this case, the connecting part 36 is supported directly on the cylinder head 46 and screwed by a screw 70 with the cylinder head 46.

The screw 70 penetrates a passage opening of the connecting part 36 and is screwed into the cylinder head 46. The screw 70 is supported via its screw head 72 at a arranged on the side of the fuel rail 12 support surface 74 of the connecting part 36, so that the connecting part 36 and thus integrally formed with the connecting part 36 receiving part 30 by means of the screw 70 with the cylinder head 46 are braced.

The one-piece design of the receiving part 30 and the connecting part 36 with each other and the non-mediated connection of the connecting part 36 to the cylinder head 46 keeps the number of parts of the mounting assembly 11 and thus their costs particularly low.

To illustrate a particularly simple and thus time and cost assembly of the mounting assembly 11, the receiving part 30 on a side facing away from the fuel rail 12 outer peripheral side 76 has a through hole 78. The through opening 78 penetrating an outer peripheral side surface of the receiving part 30 represents a lateral recess of the outer peripheral side surface (outer peripheral side 76) of the receiving part 30, wherein the support surface 74 is at least partially excluded by an overlap by the receiving part 30 by means of the recess (passage opening 78).

Thereby, the screw 70 can be screwed by means of a mounting tool, bypassing the receiving part 30 and the fuel rail 12 in the cylinder head 46. In other words, the particular straight assembly tool passes laterally on the fuel rail 12.

Again Fig. 9 can be seen, additionally passes through the screw 70 penetrated through opening of the connecting part 36 obliquely to the longitudinal direction of the connecting part 36, so that a particularly advantageous accessibility to the screw 70 is realized. The included by the passage opening and the longitudinal direction angle can be kept low by the provision of the passage opening 78 (recess).

The Fig. 10 shows a further embodiment of the fastening assembly 11, in which the receiving part 30 and the connecting part 36 are integrally formed with each other. As in the attachment assembly 11 according to Fig. 9 is the connecting member 36 directly and thus mediated supported on the cylinder head 46 and connected thereto by means of the screw 70. The surface normal of the support surface 74, on which the screw 70 is supported, and the longitudinal extension direction of the connecting part 36 in this case include a different angle from 0 °. As a result, the already to the fastening assembly 11 according to Fig. 9 described, at least partially covering freedom of the support surface 74 relative to the receiving part 30 and the fuel rail 12 realized so that the screw 70 can be easily accessible and tightened by the mounting tool in a simple manner.

The simple accessibility to the screw 70 is further realized in that the fuel rail 12 is received in two annular segments 78 of the receiving part 30, wherein between the ring segments 78 a recess 80 is provided. Thus, the assembly tool can be passed during assembly on the fuel rail 12.

The Fig. 11 shows a further embodiment of the fastening assembly 11 according to Fig. 8 , wherein the receiving part 30 as in the fastening arrangement 11 according to Fig. 9 a recess in the form of a through hole 78 has its outer peripheral side surface (outer peripheral side 76).

The Fig. 12 shows the receiving part 30 with the connecting part 36 and the stud 40 according to Fig. 11 in a longitudinal sectional view. The stud bolt 40 and the connecting part 36 are connected to each other by means of the union nut 48.

The FIGS. 13 and 14 show further embodiments of the receiving part 30 and the integrally formed therewith connecting part 36. The receiving part 30 and the connecting part 36 are formed for example as a one-piece cast component. Respective radii R are advantageously particularly large to design to avoid voltage spikes. In addition, a material spout 82 is provided. The material spout 82, which is also referred to as a material thickness spout, minimizes stiffness jumps on or to the fuel rail 12.

The Fig. 15a-e show a further embodiment of the receiving part 30 and the connecting part 36. The receiving part 30 and the connecting part 36 according to the Fig. 15a-e are formed as a one-piece cast component and thus integrally with each other.

As in the attachment assembly 11 according to Fig. 10 can in the cast component according to the Fig. 15a-e the connecting part 36 directly, ie without mediation, be attached to the cylinder head 46. This keeps the number of parts of the mounting assembly 11 low.

The connecting part 36 has for this purpose a passage opening 84 through which a screw such as the screw 70 can be passed. The screw 70 can be supported on the support surface 74 and thus clamp the cast component and above the fuel rail 12 with the cylinder head 46.

How the particular Fig. 15b can be seen, the surface normal 86 of the receiving part 30 and the fuel rail 12 facing support surface 74 with the direction indicated by the direction arrow 38 longitudinal direction of the connecting part 36 a different angle from 0 °. In the present case, the angle is at least substantially 12 °. As a result, the support surface 74 is at least partially disposed without cover relative to the receiving part 30, so that the screw head of the screw 70 is accessible for assembly. The assembly tool for tightening the screw 70 can thus be guided laterally past the receiving part 30 or to the fuel rail 12.

In order to keep the angle between the longitudinal extension direction and the surface normal 86 small, the outer peripheral side 76 (outer peripheral side Lateral surface) of the receiving part 30 has a recess, which in the present case is designed as a passage opening 78.

The basis of the Fig. 1 to 15e All of the described fastening arrangements 11 have the advantage that a central and torque-free screw connection of the fuel rail 12 to the cylinder head 46 is made possible. Further, no mounting hole is provided on the fuel rail 12, so that an undesirable and adverse weakening of the fuel rail 12 is avoided.

Claims (11)

1. Fastening arrangement (11), comprising a fuel supply device (10) and an internal combustion engine, wherein at least one fuel distribution element (12) extending in a longitudinal direction (14) and having at least two connection openings (24) for connecting a respective fuel injection device is attached to the internal combustion engine by means of at least one connecting member (36, 36'), the connecting member (36, 36') being connected to the fuel distribution element (12) by means of a receiving element (30, 30') which comprises a receptacle (32, 32') which completely surrounds at least one outer peripheral area of the fuel distribution element (12), and in which at least a portion of the fuel distribution element (12) is received, a location (62, 62') of the fuel distribution element (12) which is situated on an extension of the connecting member (36, 36') in the extension direction (38, 38') thereof being located on a straight line (64) connecting the two connection openings (24), and the connecting member (36, 36') comprising at least one supporting surface (74) arranged on a side of the fuel distribution element (12) and arranged at least partly so as not to overlap with the receiving element (30, 30'), the at least one supporting surface being adapted to support a fastening element for fastening the connecting member (36, 36) to the internal combustion engine,
   characterised in that
   the direction of extent (38, 38') and the surface normal of the supporting surface (74) enclose with one another an angle different from zero degrees.
2. Fastening arrangement (11) according to claim 1, characterised in that the connecting member (36, 36') and the connection openings (24) are arranged on a common side (20) of the fuel distribution element (12).
3. Fastening arrangement (11) according to one of claims 1 or 2, characterised in that a central longitudinal axis (68) of the fuel distribution element (12) is located in a plane which is spanned by the straight line (64) and the extension direction (38, 38').
4. Fastening arrangement (11) according to one of the preceding claims, characterised by at least one additional connecting member (40) which is interlockingly and/or reversibly releasably connected to the first connecting member (36, 36'), and by means of which the fuel supply device (10) is attached to the internal combustion engine.
5. Fastening arrangement (11) according to claim 4, characterised in that the connecting members (36, 36', 40) are connected by means of a screw element (48), particularly a nut (48), which is screwed to one of the connecting members (36, 36') and is supported on the other one of the connecting members (40) by means of respective stops (54, 56).
6. Fastening arrangement (11) according to one of claims 4 or 5, characterised in that one of the connecting members (36, 36') is at least partly received in a receptacle (60) of the other one of the connecting members (40).
7. Fastening arrangement (11) according to one of the preceding claims, characterised in that the connecting member (36, 36', 40), particularly the additional connecting member (40), is substantially rod-shaped at least in regions and has a thread (44), particularly an external thread (44), via which the connecting member (36, 36', 40) is connected to the internal combustion engine.
8. Fastening arrangement (11) according to one of the preceding claims, characterised in that the connecting member (36, 36') and the receiving element (30, 30') are formed in one piece with one another, and/or the receiving element (30, 30') and the fuel distribution element (12) are connected to one another by a material joint.
9. Fastening arrangement (11) according to claim 8, characterised in that the connecting member (36, 36') formed in one piece with the receiving element (30, 30') is directly connected to the internal combustion engine.
10. Fastening arrangement (11) according to one of the preceding claims, characterised in that the extension direction (38, 38') and the surface normal of the supporting surface (74) enclose with one another an angle greater than zero degrees and up to 12 degrees.
11. Fastening arrangement (11) according to one of the preceding claims, characterised in that the receiving element (30, 30') has at least one recess disposed on an outer peripheral side facing away from the fuel distribution element (12), wherein the supporting surface (74) is at least partially excluded from being covered by the receiving element (30, 30') by means of the recess in the receiving element.

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