Arrangement for connecting at least one fuel injection valve to a fuel distributor of a fuel injection system and fuel injection system of an internal combustion engine

Abstract

Arrangement for connecting at least one fuel injection valve (300) to a fuel distributor (200) of a fuel injection system of an internal combustion engine, wherein the at least one fuel injection valve (300) is detachably fastened to a cup (210) of the fuel distributor (200) by means of a holding element (500), wherein the cup (210) has at least one gap (210C) which, in the assembled state, makes a clamping collar (330C) of a connecting element (330) of the fuel injection valve (300) accessible, since the connecting element (330) of the fuel injection valve (300) is inserted in the cup (210) in the assembled state, wherein the clamping collar (330C) is fixed in the cup (210) by clamping jaws (501, 502) of the holding element (500) pushed into the gap (210C), characterized in that the cup (210) has a recess (210D-1),whose contour corresponds to the contour of a securing web (320B) formed on the fuel injection valve (300), whereby the fuel injection valve (300) is arranged in a rotationally secure manner relative to the cup (210) in the assembly situation in which the securing web (320B) engages positively in the recess (210D-1).

Description

[0001] The invention relates to an arrangement for connecting at least one fuel injection valve to a fuel distributor of a fuel injection system of an internal combustion engine, in particular a fuel injection system for high-pressure injection, wherein the at least one fuel injection valve is detachably fastened to a cup of the fuel distributor by means of a holding element.

[0002] The publication WO 2016 / 020 255 A1 describes an arrangement for connecting a connecting part of a fuel injector to a cup of a fuel-carrying component, wherein a connecting clamp is provided. In the assembled state, the connecting clamp connects the connecting part of the fuel injector to the cup. A contact contour provided on the connecting part and a contact contour provided on the connecting clamp, at which contact is established between the connecting part and the connecting clamp in the assembled state, are configured to match one another in such a way that a mounting of the connecting part on the connecting clamp is ensured, which enables pivoting of the connecting part relative to a longitudinal axis of the cup.

[0003] Furthermore, another arrangement for high-pressure injection in internal combustion engines is known from the publication WO 2013 / 170 998 A1. It comprises a fuel distributor and several fuel injectors. Each of the fuel injectors is arranged on a cup of the fuel distributor. At least one of the fuel injectors is fastened to the associated cup by a holding element. The holding element has a support surface. The cup has a contact surface on its underside, with which the cup is supported on the support surface of the holding element by means of a damping layer. The holding element is fixed to the cup. The fuel injector further has a collar that is supported on the holding element. The damping layer enables vibrations to be damped and thus noise emissions to be reduced.

[0004] The document DE 10 2008 002 122 A1 discloses a hold-down device for a fuel injection device comprising at least one fuel injector, a receiving bore for the fuel injector, and a connecting piece of a fuel distribution line. The hold-down device can be clamped between a shoulder of the fuel injector and an end face of the connecting piece. The hold-down device has a partially annular base element, from which extends an axially flexible hold-down bracket having at least two webs, two inclined sections, and two contact sections. The base element is designed as an upright partial ring whose wall thickness corresponds to the sheet metal thickness used.The base element merges into the two webs of the hold-down bracket in such a way that the webs extending out of the plane of the base element are opposite each other with their broad sides of the sheet metal and the webs are bent at their end facing away from the base element in such a way that the beveled sections extend from the bent end regions of the webs in such a way that the cutting edges in the sheet metal are now opposite each other.

[0005] The connecting clamp from the arrangement according to the document WO 2016 / 020 255 A1 and the hold-down device according to the document DE 10 2008 002 122 A1 represent structures that are geometrically complex to manufacture. The holding element according to the document WO 2013 / 170 998 A1 is already somewhat simpler in terms of geometry.

[0006] The prior art also includes the documents US 2006 / 0 118 091 A1, US 5 035 224 A and EP 0 568 075 A1.

[0007] The invention is based on the object of creating an advantageous connection between a fuel injection valve and a fuel distributor of an internal combustion engine.

[0008] The starting point of the invention is an arrangement for connecting at least one fuel injection valve to a fuel distributor of a fuel injection system of an internal combustion engine, in particular a fuel injection system for high-pressure injection, wherein the at least one fuel injection valve is detachably fastened to a cup of the fuel distributor by means of a holding element.

[0009] The cup is provided with at least one gap that, during assembly, makes a clamping collar of a connecting element of the fuel injector accessible. The connecting element of the fuel injector is inserted into the cup during assembly. During assembly, the clamping collar is secured in the cup by clamping jaws of the retaining element pushed into the gap, which is seen as a particularly effective connection between the components to be connected—in this case, between the connecting element of the fuel injector and the fuel distributor or a fuel distributor rail.

[0010] It is advantageously provided that the fuel injector is arranged in a manner that prevents rotation relative to the cup. For this purpose, according to the invention, the cup has a recess whose contour corresponds in a form-fitting manner to the contour of a securing web formed on the fuel injector, whereby the fuel injector can no longer be rotated relative to the cup in the assembled state in which the securing web engages the recess.

[0011] In a further preferred embodiment of the invention, the clamping collar is designed with play in the assembly situation relative to the clamping jaws of the holding element, whereby the connecting element of the fuel injector can be pivoted with respect to the longitudinal axis, which will be explained in more detail in the following description.

[0012] In a preferred embodiment of the invention, the clamping collar of the connecting element of the fuel injector is designed as a groove, whereby the clamping collar has a smaller diameter than the adjacent collars, wherein the clamping jaws of the holding element, in the assembled situation, engage partly in the groove of the connecting element of the fuel injector and partly in the gap formed between a first cup section and a second cup section.It is clear that by forming simple geometric structures, in particular the groove in the connecting element of the fuel injector or the gap in the cup of the fuel distributor, a simple connection is advantageously created by means of a holding element, which fixes the fuel injector in a form-fitting manner in the cup even in high-pressure applications in which pressures of more than 400 bar are applied to the fuel injector during operation.

[0013] In a preferred embodiment of the invention, the gap between the first cup section and the second cup section is designed such that the cup sections are connected to one another via at least one cup web.

[0014] The at least one cup web or the two cup webs formed in the following description advantageously serve, in addition to the function as a connecting element between the cup sections, as guide elements when inserting the holding element into the gap of the cup or into the groove of the fuel injection valve, as will also be explained in more detail in the following description section with reference to the figures.

[0015] Preferably, the holding element comprises a first region and a second region.

[0016] The first area is designed as a “U”, with the legs of the “U” forming two arms with end pieces that are spaced apart from each other.

[0017] The second region, in which the arms spaced apart from one another are formed, has, at least on the side facing the clamping collar, an inner contour which corresponds positively to the outer contour of the clamping collar, whereby the inner surfaces of the inner contour of the two arms form the clamping jaws which fix the clamping collar in a positively locking manner in the assembly situation.

[0018] It becomes clear that it is advantageously possible, by simply adapting the inner contours of the opposing arms and the outer contour of the clamping collar of the connecting piece, for the holding element or the inner contour of the holding element to be easily adapted in a form-fitting manner to any type of outer contour of the clamping collar of different fuel injectors.

[0019] In a preferred embodiment, the holding element has a third region which adjoins the second region in the longitudinal extension of the holding element, wherein the arms which are spaced apart from one another extend beyond the clamping collar in the assembled situation and form the third region. The end pieces which are now formed at the end of the third region rather than at the end of the second region open into an opening in the plane of the arms, so that a distance provided between the arms in the central region is increased in the third region by the end pieces which extend outwards in the plane of the arms. This solution advantageously achieves the effect that it is easier to insert the holding element into the gap via the first cup web and the second cup web, wherein the cup webs guide the holding element when the holding element is pushed in.

[0020] The arrangement according to the invention enables the fuel injector, when installed in an internal combustion engine, to be connected at one end via the connecting element exclusively to the cup of the stationary fuel distributor and at the other end only via its injector tip to an installation channel of the internal combustion engine, so that structure-borne noise generated in an injector body of the fuel injector is not transmitted to the internal combustion engine since there is no contact between the injector body and the internal combustion engine.

[0021] In other words, the fuel injector is fixed exclusively via the connecting element in the cup and via the injector tip in the internal combustion engine, in particular in an installation channel of a cylinder head of the internal combustion engine. This ensures that structure-borne noise generated in the injector body during operation of the fuel injector is not transmitted to the internal combustion engine, in particular not to the cylinder head, because there is a spatial separation between the cylinder head and the injector body. In the air-filled space between the cylinder head and the injector body, the sound waves generated in the injector body are advantageously dampened in such a way that transmission to the cylinder head no longer occurs.

[0022] Also related to the invention is a fuel injection system of an internal combustion engine, in particular for high-pressure injection, with an arrangement for connecting at least one fuel injection valve to a fuel distributor of the fuel injection system, wherein the at least one fuel injection valve is detachably fastened to a cup of the fuel distributor by means of a holding element, wherein the cup has at least one gap which, in the assembly situation, makes a clamping collar of a connecting element of the fuel injection valve accessible when and / or since the connecting element of the fuel injection valve is inserted in the cup in the assembly situation, wherein the clamping collar is fixed in the cup in the assembly situation by clamping jaws of the holding element pushed into the gap.

[0023] The invention is explained below with reference to the accompanying drawings. They show: Fig. 1 a cylinder head with a fuel rail, which is connected to fuel injection valves projecting into the cylinder head, in a perspective view obliquely from below onto the cylinder head; Fig. 2 a fuel injection valve arranged between the cylinder head and the fuel rail in an enlarged view according to Fig. 1 in a perspective view obliquely from above of the fuel injector; Fig. 3 the fuel distribution rail with two fuel injection valves in a perspective individual view; Fig. 4 is an enlarged perspective view obliquely from above of the connection according to the invention between a fuel injector and the fuel distribution rail; Fig. 5 a section through the longitudinal center axis of a fuel injector in the installed position with the cylinder head and the fuel rail also shown in section; and Fig. 6 an enlarged sectional view through the longitudinal center axis of the fuel injector in the installation situation in the fuel distribution rail according to Fig. 5.

[0024] The same reference symbols are used for the same components in all figures below, although it may not be necessary to explain all the components already presented again in each figure using the reference symbols.

[0025] Fig. 1 shows a cylinder head 100 of an internal combustion engine in a perspective view with a view obliquely from below of the cylinder head 100. On the cylinder head 100, which also serves as an attachment structure, a fuel distribution in the form of a fuel distribution rail 200 is arranged, on which a plurality of fuel injection valves 300 are arranged.

[0026] In the overview of the Fig. 1, only the components 310, 320, 360 of the fuel injection valve 300 arranged outside the cylinder head 100 are visible.

[0027] The fuel rail 200 serves to store fuel under high pressure and to distribute the fuel to the plurality of fuel injectors 300, which are designed in particular as high-pressure injectors.

[0028] The high-pressure injection valves 300 and the fuel rail 200 are designed for operating pressures above 400 bar. The fuel injection valves 300 inject the fuel required for the combustion process under high pressure into a combustion chamber 115 (see Fig. 5) of the internal combustion engine.

[0029] The fuel is compressed upstream of the fuel rail 200, usually by a high-pressure pump, and is delivered to the fuel rail 200 via a high-pressure line in a controlled manner. The arrangement is advantageously designed as a fuel injection system for high-pressure injection in internal combustion engines, with the fuel injection system being intended in particular for mixture-compressing, spark-ignition internal combustion engines. The fuel injection system is particularly suitable for direct gasoline injection, particularly in direct-injection turbocharged gasoline engines.

[0030] The fuel distribution rail 200 comprises a cup 210 or a corresponding number of cups 210 for each fuel injection valve 300 of the usually several fuel injection valves 300 arranged on the fuel distribution rail 200, wherein Fig. 1 shows two cups 210 as an example.

[0031] The subject of the invention is an arrangement which serves to connect the fuel injection valve 300 to the cup 210 of the fuel-carrying component, in particular the fuel rail 200.

[0032] The arrangement according to the invention is, as in Fig. 1, a fuel rail 200 is arranged laterally of a cylinder block, in particular of the cylinder head 100. The upper side of the cylinder head 100, provided in the installed position, is designated by reference numeral 101, and a side wall 102 of the cylinder head 100 is provided with reference numeral 102. The fuel rail 200 is fixedly attached to the cylinder head 100 via fastening elements 220.

[0033] The lateral arrangement of the fuel distribution rail 200 results in the problem that the connection of the fuel injection valve 300 should be made using a very small installation space, since only a small installation space is available in the lateral area.

[0034] In the lateral arrangement of the fuel rail 200, the fuel injection valves 300 extending from the fuel rail 200 are essentially at right angles to the cylinder pistons in the cylinder block or - compare the Fig. 5 - arranged diagonally downwards leading to the combustion chamber 115.

[0035] In the conventional lateral arrangement of one of the fuel injectors 300, an injector body 340 of the fuel injector 300 is supported in the installation channel 110 of the cylinder head 100, which is designed as a receiving bore. Compare Fig. 5, which shows the injector body 340 of the fuel injection valve 300, which according to the invention is no longer supported in the installation channel 110 of the cylinder head 100, as will be explained.

[0036] The combustion chamber 115 (compare Fig. 1) is located below the intake valves 120, between which the spark plug 130 is arranged, wherein the cylinder chambers of the cylinder pistons, not shown, forming the combustion chamber 115, are connected to the intake valves 120 in a known manner.

[0037] The previous support of the fuel injection valves 300 in the installation channel 110 of the cylinder head 100 was disadvantageously carried out at a step 110A of the installation channel 110 of the cylinder head 100 via a step 340A (compare Fig. 5) of the injector body 340 of the fuel injection valve 300.

[0038] The previous support of the fuel injection valve 300 in the cylinder head 100 leads to the introduction of structure-borne noise into the cylinder head 100 and the adjacent components such as a cylinder crankcase, a cylinder head cover and the fuel rail 200.

[0039] By arranging the fuel injectors 300 laterally in the cylinder head 100, the invention solves the marginal problem of the limited available installation space to the side of the cylinder head 100 and, at the same time, the main problem of the transmission of structure-borne noise from the fuel injectors 300 to the cylinder head 100, in particular to the adjacent components of the fuel injector 300 or the fuel injectors 300, as will be explained in detail below.

[0040] The Fig. 2 shows a fuel injection valve 300 arranged between cylinder head 100 and fuel rail 200 in an enlarged view according to Fig. 1 in a perspective view with a view obliquely from above of the fuel injector 300.

[0041] In this view, the cup 210 is visible, in which a holding element 500 is arranged, which in particular in an insertion direction Y Eis inserted into the cup 210.

[0042] In the assembled situation, the holding element 500 fixes a connecting element 330 (in Fig. 2 not visible) of the fuel injection valve 300 in the cup 210 and is positioned with a desired tolerance in an installation channel 110 of the cylinder head 100, as will also be explained in detail.

[0043] The connecting element 330 of the fuel injector 300 thus represents the actual component for connecting the fuel injector 300 to the cup 210 of the fuel rail 200.

[0044] Specifically, the connecting element 330 can also be provided as a separate component that can be connected to a fuel nozzle of the fuel injector 300. It is possible, in a known manner, to provide an axial fastening area on the fuel nozzle of the fuel injector 300 so that the fuel injector 300 can be connected to the connecting element 330.

[0045] Visible in Fig. 2 a plug element 310 and a transition element 320 which connects the plug element 310 to a socket element 360.

[0046] In the exemplary embodiment, an upwardly extending web 320A (compare Fig. 4) which merges at right angles into a further securing web 320B which, in the installed situation, runs essentially horizontally.

[0047] The securing bar 320B is in the assembly situation of fuel injector 300 and cup 210, as the Fig. 2 in conjunction with the Fig. 4 makes clear, in a recess 210D-1 of the cup 210, whereby the fuel injection valve 300 is positioned in the cup 210 in a rotationally secure manner, as will be further explained with reference to the following figures.

[0048] In another embodiment not shown, the securing web 320B is also arranged in a recess 210D-1 of the cup 210 in the assembled state, but is formed in the connecting element 330, so that the design of the securing web 320B via the transition element 320 and the web 320A extending therefrom is omitted. What is essential is the arrangement of a recess 210D-1 in the cup 210, into which a securing web 320B extending from the fuel injector 300 engages in the assembled state.

[0049] The Fig. To improve the overview, Fig. 3 shows the fuel distribution rail 200 with two fuel injection valves 300 in a perspective individual view without the cylinder head 100. The fuel injection valves 300, which extend essentially horizontally in their installation position, are shown in the Fig. 3 aligned vertically to make the components more visible.

[0050] A fuel injection valve 300 usually represents an assembly part which, in the exemplary embodiment, comprises the already mentioned components plug element 310, transition element 320 and socket element 360.

[0051] In the exemplary embodiment, the plug element 310 is connected to the injector, which is formed from the injector body 340 and an injector tip 350, which are usually cylindrical.

[0052] A circumferential seal 350A is arranged on the injector tip 350, which ensures the fuel-side sealing of the installation channel 110, in particular a fuel-side sealing of the injector tip 350 with respect to the installation channel 110 of the cylinder head 100 and thus ultimately with respect to the combustion chamber 115 in the cylinder block.

[0053] Plug element 310, injector body 340 and injector tip 350 lie on an axis X, in particular a longitudinal central axis X M of the fuel injector 300, while the transition element 320 extends at right angles from the plug element 310.

[0054] Above the plug element 310, also lying on the axis X, is the Fig. 2 not visible connecting element 330, compare the Fig. 4 to 6, which will be discussed below.

[0055] The Fig. 4 shows in a summary with the Fig. 5 and Fig. 6 is an enlarged perspective view with a view obliquely from above of the connection according to the invention between the fuel injector(s) 300 and the fuel rail 200.

[0056] The connecting element 330 is shown in the Fig. 4 a second collar 330B is visible, which, viewed in the direction of flow of the fuel through the fuel injection valve 300 along the axis X, is connected to a first collar 330A (compare the Fig. 5 and Fig. 6) follows.

[0057] The collars 330A, 330B, which are cylindrical in the exemplary embodiment, are formed by a likewise cylindrical groove 330C-1, which is preferably circumferential and at least partially formed (compare the Fig. 5 and Fig. 6) is formed, which is arranged between the upper part of the connecting element 330 with the first collar 330A and the lower part of the connecting element 330 with the second collar 330B.

[0058] Between the collars 330A, 330B there is a clamping collar 330C set back by the groove depth of the groove 330C-1 (compare Fig. 5) with a circumference which is smaller than the adjacent collars 330A, 330B, which is also cylindrical and whose clamping collar height extends in the direction of the axis X.

[0059] In the upper part of the connecting element 330 there is also a circumferential seal 330D (compare Fig. 5) which is arranged below an inlet opening of the fuel injection valve 300 in the upper part of the connecting element 330 and seals the connecting element 330 from the inner wall surface of the cup 210 on the fuel side.

[0060] In the cup 210, in the assembly situation of the cup 210 with the fuel injection valve 300, a gap 210C is formed in the area of ​​the outer surface of the clamping collar 330C (compare Fig. 4 to 6) which partially separates the cup 210 into a first cup section 220A and a second cup section 210B, wherein the connection of the cup sections 220A, 220B is formed by two cup webs S1, S2 (cf. Fig. 4) is effected in an insertion direction Y E of the holding element 500. The cup webs S1, S2 connect the cup sections 220A, 210B to one another.

[0061] The gap height of the gap 210C (compare Fig. 6) viewed in X-direction essentially corresponds to the clamping collar height of the clamping collar 330C.

[0062] In other words, the gap 210C completely penetrates the wall material of the cup 210 outside the cup webs S1, S2, so that the part of the connecting element 330 lying between the collars 330A, 330B, which serves as a clamping collar 330C, is made accessible in the region of the gap 210C.

[0063] In the assembly situation, the holding element 500 engages in the gap 210C in the manner of a clamping element, which fixes the connecting element 330, in particular the clamping collar 330C of the connecting element 330 of the fuel injector 300, in the cup 210 in a form-fitting manner and positions it in the cup 210 with a desired tolerance.

[0064] The structure of the clamping element 500 in its installation situation is shown using CAD lines in Fig. 4 made visible.

[0065] The clamping element 500 comprises a closed U-shaped area 550A, from which two opposite arms 501, 502 extend, which have a length such that they at least the clamping collar 330C (see Fig. 5 and Fig. 6) can encompass.

[0066] The arms 501, 502 are opposite each other transversely to the axis X. The arms 501, 502 initially run parallel until they form a central region 550B of the clamping element 500.

[0067] The clamping element 500 comprises in its central region 550B clamping jaws which are designed as arms 501, 502 which are semicircular at least on their inner sides such that the inner surfaces of the semicircular contours of the arms 501, 502 correspond in a form-fitting manner to the contour of the outer surface of the clamping collar 330C, so that the outer surface of the clamping collar 330C of the connecting element 330 comes into contact at least partially with the inner surfaces of the semicircular contours of the arms 501, 502 in the assembled situation.

[0068] Behind the central region 550B in a region 550C opening at one end, the arms 501, 502 again run parallel, analogous to the region between the U-shaped region 550A and the central region 550B.

[0069] The clamping element 500 thus comprises at one end the open area 550C, which is formed by the spaced-apart end pieces 501-1, 502-1 of the arms 501, 502.

[0070] The spaced end pieces 501-1, 502-1 initially run parallel, but open towards their ends to form a mouth which opens outwards, resulting in a V-shaped mouth of the clamping element 500 opposite the “U” on one end, which facilitates the insertion of the clamping element 500 during assembly when clamping the clamping collar 330C of the connecting element 330, as will be explained in more detail below.

[0071] As explained, the spaced end pieces 501-1, 502-1 of the arms 501, 502 are required for better assembly, but the formation of the spaced end pieces 501-1, 502-1 of the arms 501, 502 in the length shown and the formation of the V-shaped mouth between spaced end pieces 501-1, 502-1 of the arms 501, 502 is not absolutely necessary for the actual function of clamping the connecting element 330 by means of the clamping element 500.

[0072] However, it is advantageously provided that the end pieces 501-1, 502-1 of the arms 501, 502 are formed in the illustrated axial length so that they project beyond the outer surface of the cup sections 210A, 210B in the assembly situation, whereby end pieces 501-1, 502-1 of the arms 501, 502 are visible in the desired assembly situation on the opposite side of the U-shaped region 550A, whereby the correct assembly position of the clamping element 500 can be checked by the worker.

[0073] In the Fig. 4 it is also clear that the second cup section 210B forms a lower end plane which has a shoulder which extends in the direction of the transition element 320, so that a material projection formed on one side is formed on the second cup section 210B, which projection serves as a securing projection 210D (compare Fig. 3) the cup 210 is called.

[0074] The transition element 320 (compare the Fig. 5 and Fig. 6) has in the embodiment the outgoing web 320A (compare Fig. 4) which merges at a right angle into another securing web 320B which, in the installed position, runs essentially horizontally. The securing web 320B is inserted in the recess 210D-1 of the securing projection 210D of the cup 210 in the assembled state of the fuel injector 300 and cup 210, as shown in the Fig. 2 in conjunction with the Fig. 3, Fig. 4 and Fig. 5, whereby the fuel injector 300 is positioned in the cup 210 in a rotationally secure manner. The recess 210D-1 is formed as a rectangular cutout that is open on its underside.

[0075] Furthermore, the recess 210D-1 in the second cup section 210B of the cup 210 is arranged in the assembly situation at 90° relative to the longitudinal axis Y of the clamping element 500, which in the exemplary embodiment runs in the y-direction, thereby ensuring better accessibility of the gap 210C for mounting the clamping element 500.

[0076] The Fig. 5 shows a section through the longitudinal central axis X M of the fuel injection valve 300 in its installed position with the cylinder head 100 and the fuel distribution rail 200 also shown in section.

[0077] The Fig. 6 shows an enlarged sectional view through the longitudinal central axis X Mof the fuel injection valve 300 in the installation situation in the fuel rail 200 according to Fig. 5.

[0078] In the previous description, all components essential to the invention have already been presented, so that the assembly as well as other technical features and their advantages are explained below using the components.

[0079] In conjunction with the Fig. 1 illustrates the Fig. 5, the fuel rail 200 protrudes only slightly from the side wall 102 of the cylinder head 100 shown in section. The fuel injection valve 300 is arranged essentially over its entire length with the upper part of the connecting element 330 in the installation channel 110.

[0080] Only the upper part of the connection element 330 with the first collar 330A and the socket element 360, via which the electrical power supply of the fuel injection valve 300 is effected, protrudes slightly from the cylinder head 100 of the internal combustion engine.

[0081] The connection arrangement between the fuel injector 300 and the cup 210 of the fuel rail 200 extends in the axial direction of the fuel injector 300. The connection is ultimately realized by the collars 330A, 330B and the clamping collar 330C and the holding element 500, wherein the respective arm heights of the arms 501, 502 of the holding element 500, viewed in the axial direction, correspond to the clamping collar height of the clamping collar 330C.

[0082] Due to the low overall heights of the collars 330A, 330B and the clamping collar 330C, the fuel rail 200 can be arranged at a small distance from the side wall 102, which is a significant advantage of the invention.

[0083] Another significant advantage of the invention is the simple assembly that allows for tolerances.

[0084] The assembly was carried out in such a way that the fuel injection valve 300 is pushed into the cup 210 with the upper part of the connecting element 330, whereby care is taken that the securing web 320B (compare Fig. 3) is positioned in the recess 210D-1, which forms a type of stop in the recess 210D-1. As a result, the connecting element 310 of the fuel injector 300 is already secured against rotation and positioned with the intended penetration depth in the cup 210. The fuel injector 300 is then secured via the retaining element, in particular the clamping element 500.

[0085] In the previous step, the depth of the recess 210D-1 already ensures that the clamping collar 330C is positioned exactly in the area of ​​the gap 210C between the cup sections 210A, 210B. The formed cup webs S1, S2 also advantageously provide a guide for the clamping element 500, which also ensures the insertion direction Y E is automatically specified.

[0086] The U-shaped area 550A serves as a gripping area for the worker, who advantageously pushes the clamping element 500 by means of the open area 550C over the mouth-like opening over the first cup web S1 until finally the arms 501, 502 meet the clamping collar 330C behind the end pieces 501-1, 502-1.

[0087] The diameter of the clamping collar 330C is larger than the distance between the inner sides of the arms 501, 502 specified in the non-installed state of the clamping element 500, whereby the arms 501, 502 are slightly spread apart during assembly of the clamping element 500 until the semicircular central region 550B of the clamping element 500 encompasses the cylindrical contour of the clamping collar 330C.

[0088] As already explained, the end pieces 501-1, 502-1 protrude from the gap 210C between the cup sections 210A, 210B on the opposite side of the insertion side, so that the worker recognizes that the clamping element 500 is in its intended position. The second cup web S2 is arranged on the opposite side, so that the arms 501, 502, in addition to being guided on the first cup web S1, are also guided over the second cup web S2, encompassing the second cup web S2 analogously to the first cup web S1. In the manner described, several cups 210 with fuel injection valves 300 can be mounted in the fuel distribution rail 200 simply, quickly, and securely against rotation.

[0089] The connection is still so flexible that tolerances between the longitudinal axis of the installation channel 110 in the cylinder head 100 and the longitudinal center axis X Mof the fuel injection valve 300 and the longitudinal center axis X M the cup 210 of the fuel rail 200.

[0090] In the final assembly step, the fuel injector(s) are pushed into the installation channels 110 by attaching the entire fuel distribution rail 200 with the already installed fuel injectors 300.

[0091] In this case, the fuel injectors 300 are automatically positioned via the injector tip 350 in the installation channel 110 when the fuel injectors 300 are inserted in such a way that the injector tip 350 only comes into contact with the installation channel 110 via the seal 350A, while the injector body 340 has no contact points with the installation channel 110.

[0092] The structure-borne noise of the injector 300 is thus only slightly transmitted from the injector tip 350 via the structure-borne noise-damping seal 350 to the cylinder head 100.

[0093] The Fig. 5 illustrates that, advantageously, a corresponding distance is formed, especially between the injector body 340 and the installation channel 110, which prevents a direct transmission, in particular a direct transmission of sound waves from the injector body 340 to the cylinder head 100.

[0094] In the last assembly step, it is also advantageously ensured that an exemplary tolerance between the longitudinal axis of the installation channel 110 and / or the longitudinal center axis X M of the fuel injection valve 300 and / or the longitudinal center axis X M the cup 210, viewed in the axial direction of the fuel injection valve 300, can be compensated by the connection created by means of the holding element 500.

[0095] The clamping element 500 allows, in comparison to the connecting element 330, if one of the mentioned possible tolerances with respect to longitudinal axes X which are not on one axis M present, a tilting of the connecting element 330 of the fuel injection valve 300 in the region of the first and second cup sections 210A, 210B.

[0096] Although the clamping element 500 ensures that the connecting element 330 is fixed precisely in the cup 210, the clamping collar 330 of the fuel injector 300 can tilt with its peripheral surface relative to the inner surfaces of the central region 550B of the clamping element 500, so that, for example, the longitudinal central axis X M of the fuel injection valve 300 relative to the longitudinal center axis X Mthe cup 210 is shifted by a small angular amount, whereby a straight seat of the injector 300; 340, 350 in the installation channel 110 is always ensured, whereby contact points between the injector body 340 and the installation channel 110 of the cylinder head 100 are reliably avoided.

[0097] In summary, according to the invention, a very simple and secure, almost play-free fastening of the fuel injector 300 to the fuel distributor rail 200 is achieved, which is also rotationally secure and which, within the scope of the available or deliberately provided play between the clamping element 500 and the connecting element 330 in the seat, is able to compensate for any tolerances that may be present in the interconnected components during assembly, wherein the connection requires only a small installation space.

[0098] The compact connection is particularly advantageous for a lateral injector location, as already explained. The connection also ensures that high pressures of over 400 bar can be applied to the fuel injector 300.

[0099] Furthermore, only a single component is required, namely the clamping element 500, which is inserted into the designated gap 210C of the cup 210 during assembly. Only low costs are incurred for the production of the clamping element 500, and the clamping element 500 is subject to little or no wear, making the clamping element 500 particularly durable.

[0100] Compared to the aforementioned publications, the clamping element 500 is geometrically even simpler in design and represents a clamp-like clamping element that is even simpler in design than the conventional connecting clamp described in WO 2016 / 0202255 A1. The clamping element 500 according to the invention is also geometrically more straightforward in design than the hold-down device disclosed in DE 10 2008 002 122 A1. Even compared to the geometrically relatively simple design of the holding element according to WO 2013 / 170998 A1, the clamping element 500 of the presented inventive solution is even simpler in design.

[0101] The simple construction is made possible by the fact that the gap 210C corresponding to the clamping element 500 for inserting the holding element 500 to establish the connection between the connecting element 310 of the fuel injection valve 300 and the cup 210 of the fuel distributor rail 200 has been created in the cup 210, which is not disclosed in any of the cited documents. List of reference symbols 100 cylinder head 101 Top 102 side wall 110 Installation channel 110A level 120 intake valve 115 combustion chamber 130 Spark plug 200 fuel rail 210 cup 210A first cup section 210B second cup section 210C gap 210D securing attachment 210D-1 recess S1 first cup bridge S2 second cup bar 220 fasteners 300 fuel injector 310 connector element 320 transition element 320A bridge 320B safety bridge 330 connecting element 330A first fret 330B second fret 330C clamp collar 330C-1 groove 330D seal 340 Injector fuselage 340A level 350 injector tip 350A seal 360 socket element 500 holding element 501 Clamping jaw, first arm 501-1 first end piece 502 clamping jaw, second arm 502-1 second end piece 550A U-shaped area 550B mid-range 550C open area X axis in x-direction Y axis in y-direction orthogonal to x-direction Y E Insertion direction X M Longitudinal center axis of the fuel injector 300 and the cup 210

Claims

[1] An arrangement for connecting at least one fuel injection valve (300) to a fuel distributor (200) of a fuel injection system of an internal combustion engine, wherein the at least one fuel injection valve (300) is detachably fastened to a cup (210) of the fuel distributor (200) by means of a holding element (500), wherein the cup (210) has at least one gap (210C) which, in the assembled state, makes a clamping collar (330C) of a connecting element (330) of the fuel injection valve (300) accessible, since the connecting element (330) of the fuel injection valve (300) is inserted into the cup (210) in the assembled state, wherein the clamping collar (330C) is fixed in the cup (210) by clamping jaws (501, 502) of the holding element (500) pushed into the gap (210C), characterized byin that the cup (210) has a recess (210D-1) whose contour corresponds to the contour of a securing web (320B) formed on the fuel injection valve (300), whereby the fuel injection valve (300) is arranged in a rotationally secure manner relative to the cup (210) in the assembly situation in which the securing web (320B) engages in the recess (210D-1) in a form-fitting manner. [2] Arrangement according to claim 1, characterized by that the cup (210) has a securing projection (210D) with the recess (210D-1). [3] Arrangement according to claim 1, characterized by that the clamping collar (330C) is designed to have a certain amount of play in the assembled state relative to the clamping jaws (501, 502) of the holding element (500), whereby the connecting element (330) of the fuel injection valve (300) is pivotable relative to a longitudinal axis (X M ) of the cup (210) can be pivoted. [4] Arrangement according to claim 1, characterized byin that the clamping collar (330C) of the connecting element (330) of the fuel injector (300) is designed as a groove (330C-1), whereby the clamping collar (330C) has a smaller diameter than the adjacent collars (330A, 330B), wherein the clamping jaws (501, 502) of the holding element (500) in the assembled situation engage partly in the groove (330C-1) of the connecting element (330) of the fuel injector (300) and partly in the gap (210C) formed between a first cup section (210A) and a second cup section (210B). [5] Arrangement according to claim 1, characterized by that the gap (210C) is formed between a first cup section (210A) and a second cup section (210B) which are connected via at least one cup web (S1, S2). [6] Arrangement according to claims 2 and 5, characterized byin that the second cup section (210B) forms a lower end plane which has a shoulder which extends in the direction of a transition element (320) of the fuel injector (300), so that a material projection formed on one side forms a securing projection (210D) on the second cup section (210B), wherein the transition element (320) of the fuel injector (300) has an outgoing web (320A) which merges at a right angle into a further securing web (320B) which runs horizontally in the installed situation, wherein the securing web (320B) is inserted in the securing projection (210D) of the cup (210) which has the recess (210D-1) in the assembled situation of the fuel injector (300) and cup (210). [7] Arrangement according to claim 1, characterized byin that the holding element (500) comprises at least a first region (550A) and a second region (550B), the first region (550A) being U-shaped, the legs of which form two arms (501, 502) which have end pieces (501-1, 501-2) and are spaced apart from one another and which, at least in the second region (550B), have, on their side facing the clamping collar (330C), an inner contour which corresponds at least partially to an outer contour of the clamping collar (330C), whereby the inner surface(s) of the inner contour of the two arms (501, 502) form clamping jaws which fix the clamping collar (330C) in the cup (210) in a form-fitting manner during assembly. [8] Arrangement according to claim 7, characterized byin that the holding element (500) forms a third region (550C) which adjoins the second region (550B), wherein the arms (501, 502) which are spaced apart from one another are led out beyond the clamping collar (330C) in the assembled situation and form the third region (550C), the end pieces (501-1, 502-2) of which open outwards to form an opening, so that a distance provided in the central region (550B) between the arms (501, 502) is increased in the third region (550C) by the end pieces (501-1, 501-2) which are led outwards in the plane of the arms (501, 502). [9] Arrangement according to claim 1, characterized bythat the fuel injection valve (300), in its installation situation in an internal combustion engine, is connected at one end via the connecting element (330) exclusively to the cup (210) of the stationary fuel distributor (200) and at the other end only via its injector tip (350) to an installation channel (110) of the internal combustion engine, so that structure-borne noise generated in an injector body (340) is not transmitted to the internal combustion engine. [10] Arrangement according to claim 9, characterized by that the injector tip (350) is connected to the installation channel (110) of the internal combustion engine via a seal (350A). [11] Fuel injection system of an internal combustion engine, with an arrangement for connecting at least one fuel injection valve (300) to a fuel distributor (200) of the fuel injection system, wherein the at least one fuel injection valve (300) is detachably fastened to a cup (210) of the fuel distributor (200) by means of a holding element (500), wherein the cup (210) has at least one gap (210C) which, in the assembled state, makes a clamping collar (330C) of a connecting element (330) of the fuel injection valve (300) accessible, since the connecting element (330) of the fuel injection valve (300) is inserted in the cup (210) in the assembled state, wherein the clamping collar (330C) is held in the cup by clamping jaws (501, 502) of the holding element (500) pushed into the gap (210C) in the assembled state (210) is fixed, characterized byin that the cup (210) has a recess (210D-1) whose contour corresponds to the contour of a securing web (320B) formed on the fuel injection valve (300), whereby the fuel injection valve (300) is arranged in a rotationally secure manner relative to the cup (210) in the assembly situation in which the securing web (320B) engages in the recess (210D-1) in a form-fitting manner.

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