阅读说明：本技术 在内燃机的燃料分配器上的燃料喷射阀装置 (Fuel injection valve arrangement on a fuel distributor of an internal combustion engine ) 是由 M.格舍尔 P.特里布施 于 2019-08-20 设计创作，主要内容包括：本发明涉及一种用于将至少一个燃料喷射阀(300)与内燃机的燃料喷射设备的燃料分配器(200)连接的装置,该燃料分配器可拆卸地固定在气缸盖(100)上,其中,至少一个燃料喷射阀(300)通过固定元件(330)可拆卸地固定在燃料分配器(200)的安装元件(210)上。按照本发明建议燃料分配器(200)的安装元件(210)的背离气缸的表面(A210)和固定元件(330)的面向气缸的表面(A330)在气缸盖(100)和燃料分配器(200)以及燃料喷射阀(300)的组装状态中构造为接触面(A210、A330),通过将固定元件(330)安装在燃料喷射阀(300)上,借助所述接触面(A210、A330)可实现燃料喷射阀(300)在气缸盖(100)中或在燃料分配器(200)的安装元件(210)中的轴向固定和径向定向。(The invention relates to a device for connecting at least one fuel injection valve (300) to a fuel distributor (200) of a fuel injection system of an internal combustion engine, which is detachably fastened to a cylinder head (100), wherein the at least one fuel injection valve (300) is detachably fastened to a mounting element (210) of the fuel distributor (200) by means of a fastening element (330). According to the invention, the surface (A210) of the mounting element (210) of the fuel distributor (200) facing away from the cylinder and the surface (A330) of the fastening element (330) facing the cylinder are designed as contact surfaces (A210, A330) in the assembled state of the cylinder head (100) and the fuel distributor (200) and the fuel injection valve (300), and by mounting the fastening element (330) on the fuel injection valve (300), an axial fixing and a radial orientation of the fuel injection valve (300) in the cylinder head (100) or in the mounting element (210) of the fuel distributor (200) can be achieved by means of said contact surfaces (A210, A330).)

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, which fuel distributor is detachably fastened to a cylinder head (100), wherein the at least one fuel injection valve (300) is detachably fastened to a mounting element (210) of the fuel distributor (200) by means of a fastening element (330), characterized in that a surface (A210) of the mounting element (210) of the fuel distributor (200) facing away from the cylinder and a surface (A330) of the fastening element (330) facing the cylinder are designed as contact surfaces (A210, A330) in the assembled state of the cylinder head (100) and the fuel distributor (200) and the fuel injection valve (300), by mounting the fastening element (330) on the fuel injection valve (300), by means of which contact surfaces (A210, A330) an axial fastening of the fuel injection valve (300) in the cylinder head (100) and in the mounting element (210) of the fuel distributor (200) can be achieved Fixed and radially oriented.

2. The arrangement according to claim 1, characterized in that the fixing element (330) is a screw head with a blind hole (330A) which is provided with an internal thread (330A-1) and which in the assembled state faces a surface (a210) of the mounting element (210) facing away from the cylinder, wherein the cylinder-facing surface (a330) is configured around the blind hole (330A) of the fixing element (330).

3. The device according to claims 1 and 2, characterized in that the internal thread (330A-1) of the blind hole (330A) corresponds to the external thread (302A) of a fuel pipe connection (302) of the fuel injection valve (300), which is configured as a bolt.

4. The device according to claim 1, characterized in that the through-opening of the mounting element (210) and the surface (A210) of the mounting element (210) facing away from the cylinder are, in the assembled state, predeterminably oriented by fixing the mounting element (210) on the cylinder head (100) such that the fuel injection valve (300) can be arranged in a predetermined position in the mounting channel (110) of the cylinder head (100) and in the through-opening of the mounting element (210), wherein the prepositioning of the mounting element simultaneously leads to a prepositioning of the surface (A210) of the mounting element (210) facing away from the cylinder.

5. An arrangement according to claims 1, 3 and 4, characterized in that the fuel injection valve (300) is arranged in a predetermined position relative to the mounting channel (115) and the through-hole with little play and at the same time torsionally fixed relative to the mounting element (210) of the fuel distributor (200), and that the fuel pipe joint (302) of the fuel injection valve (300) has a projection beyond the surface (A210) facing away from the cylinder.

6. The device according to claim 1, characterized in that the fixing element (330) has a polygonal structure (330B) into which a tool is embedded to perform a rotational movement of the fixing element (330), which rotational movement fixes the fuel injection valve (300) on a mounting element (210).

7. The device according to claim 1, characterized in that the contact surfaces (A210, A330) are flat surfaces, by means of which an axial fixing and a radial orientation of the fuel injection valve (300) in the cylinder head (100) and on the mounting element (210) of the fuel distribution rail (200) are achieved in that a cylinder-facing surface (A330) of the fixing element (330) bears against a cylinder-facing surface (A210) of the mounting element (210) which is pre-positioned and can be axially clamped by performing a rotational movement of the fixing element (330), wherein the contact surfaces (A210, A330) bring about a final positioning of the fuel injection valve (300) by means of the axial clamping, so that the radial orientation of the fuel injection valve (200) takes place simultaneously.

8. An arrangement according to claim 1, characterised in that a first sealing arrangement (DA1) is arranged between the combustion chamber (115) and the mounting channel (115) of the cylinder head (100), said first sealing arrangement (DA1) being configured as an annular seal which seals the tip (350) of the fuel injection valve (300) against the mounting channel (115).

9. An arrangement according to claim 1, characterized in that a second sealing arrangement (DA2) is arranged between the through hole of the mounting element (210) of the fuel distributor (200) and the mounting channel (115) of the fuel injection valve (300).

10. An arrangement according to claim 1, characterized in that a third sealing arrangement (DA3) is arranged between the contact surface (a210) of the mounting element (210) of the fuel distributor (200) and the contact surface (a330) of the fixation element (330).

11. Device according to claims 9 and 10, characterized in that the sealing means (DA2, DA3) are configured as conical sealing seats, hemispherical sealing seats, metal groove sealing means, snap edges, adhesive joints, O-ring seals, hemp strips or non-ferrous metal sealing rings, wherein the sealing means (DA2, DA3) are configured as identical sealing systems or different sealing systems.

12. A method for manufacturing a device according to one of claims 1 to 11, characterized by the following installation steps:

a) introducing the fuel injection valve (300) into an opening (115) provided for this purpose in the cylinder head (100), and

b) placing the fuel distributor (200) on a stud-shaped extension of the fuel injection valve (300) configured as a fuel pipe connection (302) through a through-hole in a mounting element (210) of the fuel distributor (200), and

c) fixing the fuel distributor (200) on a cylinder head (100), the cylinder head (100) serving as a mounting element for the fuel distributor (200), and

d) the fuel injection valve (300) is fixed to the fuel distributor (200) by means of a fixing element (330).

13. A fuel injection system of an internal combustion engine having a device 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 mounting element (210) of the fuel distributor (200) by means of a fastening element (330), characterized in that a surface (A210) of the mounting element (210) of the fuel distributor (200) facing away from the cylinder and a surface (A330) of the fastening element (330) facing the cylinder are designed as contact surfaces (A210, A330) in the assembled state of the cylinder head (100) and the fuel distributor (200) and the fuel injection valve (300), by mounting the fastening element (330) on the fuel injection valve (300), by means of which contact surfaces (A210, A330) an axial fastening of the fuel injection valve (300) in the cylinder head (100) and in the mounting element (210) of the fuel distribution rail (200) can be achieved And a radial orientation.

Technical Field

The invention relates to a device for connecting at least one fuel injection valve to a fuel distributor of a fuel injection system of an internal combustion engine, which fuel distributor is detachably fastened to a cylinder head, wherein the at least one fuel injection valve is detachably fastened to a mounting element of the fuel distributor by means of a fastening element.

Background

Document WO2016/020255a1 describes a device for connecting a connection of a fuel injection valve to a cup of a fuel-conducting component, in which a connecting clip is provided. In the assembled state, the connecting clip connects the connecting portion of the fuel injection valve with the cup. In this case, the contact between the connecting part and the connecting clip takes place in the assembled state on contact contours arranged on the connecting part and on contact contours arranged on the connecting clip, which are designed to be adapted to one another in such a way that a bearing of the connecting part on the connecting clip is ensured, which bearing effects a pivoting of the connecting part relative to the longitudinal axis of the cup.

Furthermore, another device for high-pressure injection in internal combustion engines is known from document WO2013/170998a 1. The apparatus includes a fuel dispenser and a plurality of fuel injection valves. Each fuel injection valve is arranged on a cup of the fuel distributor. At least one fuel injection valve is fixed to the associated cup by means of a retaining element. The holding element has a support surface. The cup has an abutment surface on the bottom side, by means of which the cup is supported on the support surface of the holding element by means of the damping layer. The holding element is fixed on the cup. The fuel injection valve also has a collar supported on the retaining element. Damping and therefore a reduction in noise emission can be achieved by the damping layer.

DE 102008002122 a1 discloses a holding-down device for a fuel injection device, which comprises at least one fuel injection valve, a receiving bore for the fuel injection valve and a pipe connection for a fuel distributor line. The hold-down device may be sandwiched between a shoulder of the fuel injection valve and an end face of the pipe joint. The pressing device has a partially annular base element, from which an axially flexible pressing device bow extends, which has at least two limbs, two inclined sections and two contact sections. The base element is designed such that the narrow sides support an upright partial ring, the wall thickness of which corresponds to the thickness of the plate used. The base element merges into the two limbs of the hold-down device bow such that the limbs extending out of the plane of the base element are opposite one another with their plate width sides and the limbs are bent at their ends facing away from the base element such that the oblique sections project from the bent end regions of the limbs such that only the cut edges in the plates are opposite one another.

The connecting clamp of the device according to document WO2016/020255a1 and the pressing device according to document DE 102008002122 a1 are structures which are to be manufactured with complex geometries. The holding element according to document WO2013/170998a1 is already of somewhat simpler construction in terms of geometry.

DE 102016210573 a1 discloses another device for connecting at least one fuel injection valve to a fuel distributor of a fuel injection system of an internal combustion engine, wherein the at least one fuel injection valve is detachably fastened to a cup of the fuel distributor by means of a retaining element. The cup has at least one gap which, in the assembled state, makes accessible a clamping edge of the connecting element of the fuel injection valve, since the connecting element of the fuel injection valve is inserted in the cup in the assembled state, wherein the clamping edge is fixed in the cup in the assembled state of the clamping jaws of the holding element pushed into the gap.

Disclosure of Invention

Starting from the prior art, the object of the invention is to create an alternative advantageous connection between a fuel injection valve and a fuel distributor of an internal combustion engine.

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, which fuel distributor is detachably fastened to a cylinder head, wherein the at least one fuel injection valve is detachably fastened to a mounting element of the fuel distributor by means of a fastening element.

According to the invention, in the assembled state of the cylinder head and the fuel distributor and the fuel injection valve, the surface of the mounting element of the fuel distributor facing away from the cylinder and the surface of the fastening element facing the cylinder are designed as contact surfaces, by means of which the fuel injection valve can be axially fixed and radially oriented in the cylinder head or in the mounting element of the fuel distributor by mounting the fastening element on the fuel injection valve. This interface positioning of the components relative to each other allows for precise positioning and is reliable and convenient to implement.

Preferably, the fastening element is a screw head having a blind hole with an internal thread, which in the assembled state faces the side of the mounting element facing away from the cylinder, wherein the side facing the cylinder is formed around the blind hole of the fastening element.

Furthermore, it is preferably provided that the internal thread of the blind hole corresponds to the external thread of a fuel nozzle of the fuel injection valve, which is designed as a screw.

In this way, it is advantageously possible to orient the through-opening of the mounting element and the surface of the mounting element facing away from the cylinder in the assembled state in a predeterminable manner by fixing the mounting element to the cylinder, so that an arrangement of the fuel injection valve in a predetermined position in the mounting channel of the cylinder head and in the through-opening of the mounting element is possible, wherein the prepositioning of the mounting element simultaneously leads to a prepositioning of the surface of the mounting element facing away from the cylinder.

The device according to the invention is characterized in that the fuel injection valve is arranged in a predetermined position relative to the mounting channel and the through-opening with little play and at the same time rotationally fixed relative to the mounting element of the fuel distributor, and the fuel pipe connection of the fuel injection valve has a projection beyond the surface facing away from the cylinder.

According to the invention, the fastening element has a polygonal structure, into which a tool engages in order to execute a rotational movement of the fastening element, which fixes the fuel injection valve on the mounting element. The polygonal structure is arranged on the opposite side of the fixing element to the blind hole of the fixing element.

In the assembled state (with the interposition of the mounting element of the fuel distributor) the fastening element is connected to a fuel injection valve (injector) which is formed by an injector body and an injector tip, wherein the injector tip and the fuel pipe connections and blind holes of the injector body and the fuel injection valve and the polygonal structure of the fastening element lie on a common longitudinal axis.

According to the invention, the contact surface is preferably a flat surface, by means of which an axial fixing and a radial orientation of the fuel injection valve in and on the cylinder head and relative to the mounting element of the fuel distribution rail are achieved in that the surface of the fixing element facing the cylinder comes into contact with a previously pre-positioned surface of the mounting element facing away from the cylinder, which surface of the mounting element facing away from the cylinder can be clamped axially on the surface of the mounting element facing away from the cylinder by performing a rotational movement of the fixing element, wherein the contact surface also advantageously achieves an end positioning of the fuel injection valve by means of the axial clamping, so that the radial orientation of the fuel injection valve is carried out simultaneously.

According to the present invention there is provided:

a first sealing device between the combustion chamber and the mounting channel of the cylinder head, which first sealing device is designed as an annular seal that seals the tip of the fuel injection valve (injector tip) against the mounting channel, and

second sealing means between the through hole of the mounting element of the fuel distributor and the mounting channel of the fuel injection valve

A third sealing device between the contact surface of the mounting element of the fuel distributor and the contact surface of the fixing element, which third sealing device is explained in more detail in the description.

According to the invention, a method for producing a device for connecting at least one fuel injection valve to a fuel distributor of a fuel injection system of an internal combustion engine, which fuel distributor is detachably fastened to a cylinder head, wherein the at least one fuel injection valve is detachably fastened to a mounting element of the fuel distributor by means of a fastening element, has the following mounting steps:

a) the fuel injection valve is introduced into an opening (mounting channel) provided for this purpose in the cylinder head.

b) The fuel distributor is placed on a stud-like extension of the fuel injection valve, which is designed as a fuel pipe connection, via a through-opening in a mounting element of the fuel distributor.

c) The fuel distributor is fixed to the cylinder head, which serves as a mounting element for the fuel distributor.

d) The fuel injection valve is fixed to the fuel distributor by means of a fixing element.

The invention relates to a fuel injection system of an internal combustion engine, comprising a device 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 mounting element of the fuel distributor by means of a fastening element, wherein it is provided that, in the assembled state of the cylinder head and the fuel distributor and the fuel injection valve, a surface of the mounting element of the fuel distributor facing away from the cylinder and a surface of the fastening element facing the cylinder are designed as contact surfaces, by means of which, by mounting the fastening element on the fuel injection valve, an axial fixing and a radial orientation of the fuel injection valve in the cylinder head and on the cylinder head and in the mounting element of the fuel distribution rail can be achieved.

Drawings

The invention is elucidated below with reference to the corresponding figures.

The drawing shows a section through the longitudinal center axis of the fuel injection valve in the installed state of the fuel injection valve in the cylinder head, the cylinder head and the corresponding fuel distributor (rail) also being shown in section.

Detailed Description

The arrangement of the fuel injection valve 300 in the cylinder head 100 is explained first.

The drawing is taken through a central axis X of the fuel injection valve 300_MA cross-sectional view of a cylinder head 100 of an internal combustion engine, the fuel injection valve 300 being arranged in the cylinder head 100.

On the cylinder head 100 serving as a mounting structure, a fuel distribution device of the fuel distributor 200, in particular a fuel distribution rail, also referred to simply as a rail, is arranged, on which a plurality of fuel injection valves 300 are usually arranged, as shown in the drawing.

The fuel distribution rail 200 (rail) serves to store fuel at high pressure and to distribute the fuel to a plurality of fuel injection valves 300, which plurality of fuel injection valves 300 are designed in particular as high-pressure injection valves.

The high-pressure injection valves 300 and the fuel distribution rail 200 (oil rail) are designed, for example, for operating pressures of more than 400 bar. The fuel injection valve 300 injects fuel required for the combustion process into the combustion chamber 115 of the internal combustion engine at high pressure.

The fuel is compressed upstream of the fuel distribution rail 200, typically by a high-pressure pump, and is delivered into the fuel distribution rail 200 via a high-pressure line under fuel quantity control.

Fuel from the fuel distribution rail 200 reaches the fuel injection valve 300 via a channel-like opening 201 from the fuel rail, the fuel injection valve 300 having a correspondingly adapted opening 301. In other words, fuel flows from the rail 200 into at least one or more fuel injection valves 300 via openings 201, 301.

The arrangement is advantageously designed as a fuel injection device for high-pressure injection in an internal combustion engine, wherein the fuel injection device is provided in particular for a spark-ignition internal combustion engine for mixture compression. The fuel injection device is particularly suitable for gasoline direct injection, in particular for direct injection exhaust gas turbocharged gasoline engines.

For each fuel injection valve 300 of the plurality of fuel injection valves 300 which are usually arranged on the fuel distribution rail 200, the fuel distribution rail 200 comprises a mounting element 210 in the form of a cup 210 or a corresponding number of mounting elements 210.

The cup 210 is a component, in particular a cylindrical component, which has a through-opening which is geometrically differently configured according to the invention in sections or cup sections 210A and 210B extending in the longitudinal direction of the through-opening, as will be explained in more detail below.

The subject of the invention is a device for connecting a fuel injection valve 300 to a fuel-conducting component, in particular a cup 210 of a fuel distributor rail 200.

The device according to the invention is, for example, a fuel distribution rail 200, the fuel distribution rail 200 being arranged laterally in a cylinder block, in particular a cylinder head 100 of the cylinder block.

The fuel distributor rail 200 is fixed in position on the cylinder head 100 by means of fixing elements which are not shown in detail.

In the case of a lateral arrangement of the fuel distribution rail 200, the fuel injection valves 300 branching off from the fuel distribution rail 200 are arranged substantially at right angles to the cylinder pistons in the cylinder block or (as shown) lead obliquely downwards to the combustion chambers 115.

In a conventional lateral arrangement of a fuel injection valve 300, the injector body 340 of the fuel injection valve 300 is supported in the mounting channel 110 of the cylinder head 100, which is designed as a receiving bore.

The previous support of the fuel injection valve 300 in the mounting channel 110 of the cylinder head 100 has hitherto been carried out in a disadvantageous manner on the step 110A of the mounting channel 110 of the cylinder head 100 by the step 340A of the injector body 340 of the fuel injection valve 300. The previous support of the fuel injection valve 300 in the cylinder head 100 causes body noise to be introduced into the cylinder head 100 and adjacent components, such as the cylinder crankcase, the cylinder head cover, and the fuel distribution rail 200.

Since gas injection valve 300 is arranged laterally in cylinder head 100 here, the problem of the small available installation space laterally of cylinder head 100 is solved, as well as the problem of the transmission of solid-borne sound of gas injection valve 300 to cylinder head 100, in particular to adjacent components of fuel injection valve 300 or of several fuel injection valves 300, as will be explained in more detail below.

According to the invention, the fastening element 330 of the fuel injection valve 300, which is formed separately from the fuel injection valve 300, is the actual component for connecting the fuel injection valve 300 to the cup 210 of the fuel distributor rail 200 in the so-called assembled state, the transmission of which is likewise explained again.

An axial fastening area is provided on fuel injection valve 300 as a so-called fuel rail connection 301 of fuel injection valve 300, so that fuel injection valve 300 can be fastened to fuel distribution rail 200, in particular to cup 210, by means of fastening element 330.

The fuel pipe joint 302 is configured as a stud bolt, from the axial direction X_MThe stud is seen to have a projection beyond the surface a210 of the cup 210 facing away from the cylinder in the assembled state.

The stud 302 has an external thread 302A at least in the region of the projection.

In the assembled state, fuel injection valve 300 is positioned in cup 210 in a positionally fixed and in particular rotationally fixed manner, so that surface a210 of cup 210 facing away from the cylinder can be used according to the invention as a predefinable mounting surface, which can be oriented in a three-dimensional space in advance.

In the assembled state, fuel injection valve 300 (after installation of the fuel injection valve, as will be explained below) is an assembly component comprising fuel injection valve 300 with fuel pipe connection 302 itself and fastening element 330.

In the assembled state, the fastening element 330 is connected to a fuel injection valve 300 (injector), which fuel injection valve 300 comprises an injector body 340 and an injector tip 350, the injector tip 350 being of generally cylindrical design, as shown in the figures.

A circumferential seal 350A is arranged on the injector tip 350, which seal 350A serves to seal the fuel side of the mounting channel 110, in particular to ensure sealing of the injector tip 350 with respect to the fuel side of the mounting channel 110 of the cylinder head 100 and thus ultimately with respect to the fuel side of the combustion chamber 115 in the cylinder block.

The fastening element 330, the injector body 340 and the injector tip 350 are located on an axis X, which is configured as a longitudinal central axis X of the fuel injection valve 300_M。

The fuel injection valve 300 comprises a transition element 320 branching off from the injector body, wherein the transition element 320 transitions into a socket element 360 (not shown in detail), by means of which socket element 360 electrical power is supplied to the fuel injection valve 300 for controlling the injection, which socket element 360 likewise projects slightly from the cylinder head 100 of the internal combustion engine.

The fastening element 330 has a blind hole 330A, the blind hole 330A facing, in the assembled state, the surface a210 of the cup 210 facing away from the cylinder.

The blind bore 330A is internally threaded 330A-1, the internal threads 330A-1 corresponding to the external threads 302A of the fuel pipe connector 302, the fuel pipe connector 302 being configured as a bolt.

Arranged around the blind hole 330A in the assembled state is a cylinder-facing surface a 330.

The surface a210 of the cup 210 facing away from the cylinder (also referred to as the cup-side contact surface hereinafter) and the surface a330 of the fastening element 330 facing the cylinder (also referred to as the fastening-element-side contact surface hereinafter) form the contact surfaces a210, a330, by means of which the axial fixing and the radial orientation of the fuel injection valve 300 in the cylinder head 100 on the cup 210 of the fuel distributor rail 200 is achieved.

The fastening element 330 has a polygonal structure 330B, which polygonal structure 330B allows a screwing movement of the fastening element 330 relative to the fuel injection valve 300 by means of a tool which engages in the polygonal structure 330B, the fuel injection valve 300 being pre-positioned in the cup 210 in advance in a rotationally fixed manner.

Fuel injection valve 300 has a small play with respect to the through-hole in cup 210 and mounting channel 110 in the cylinder head, so that, starting from the pre-positioning of the anti-rotation, fuel injection valve 300, after performing a screwing movement of fixing element 330 with respect to cup 210, achieves an axial final orientation and an axial final positioning of fuel injection valve 300 with respect to cup 210 and with respect to mounting channel 110 in cylinder head 100.

Furthermore, after the screwing movement of the fastening element 330 relative to the cup 210 has been carried out, starting from the pre-positioning of the fuel injection valve 300 in the cup 210 against rotation, a radial final orientation and a radial final positioning are achieved by the cup-side and fastening-element-side contact surfaces a210, a 330.

In other words, with the cup 210 positioned and oriented accordingly on the cylinder head 100, a two-dimensional final orientation and final positioning of the fuel injection valve 300 in the cylinder head 100 is carried out by screwing of the fixing element 330, the cup 210 being arranged between the cylinder head 100 and the fixing element 330.

Axial final orientation and axial final positioning of fuel injection valve 300 axially along longitudinal center axis X_MThe radial final orientation and the radial final positioning of the longitudinal axis of the fuel injection valve 300 take place within the mounting channel in the cylinder head and within the through-openings in the cup sections 210A and 210B of the cup 210In such a way that the longitudinal axis is oriented radially.

In the following, the relevant sealing and mounting arrangements for fuel injection valve 300 are explained for further explanation.

The installation is carried out in such a way that the fuel injection valve 300 is introduced into the installation channel 115 before the fuel distribution rail 200 is installed. Here, the fuel pipe joint 302 protrudes from the cylinder head 100.

Here, fuel injection valve 300 is automatically pre-positioned in mounting channel 110 by injector tip 350 during insertion of fuel injection valve 300, so that injector tip 350 is in contact with mounting channel 110 only with seal 350A, while injector body 340 has no contact point with mounting channel 110 at all. The annular seal is a first sealing device DA1 between the combustion chamber 115 and the mounting passage 115 of the cylinder head 100.

Thus, the solid-borne sound of injector 300 is now only slightly transmitted from injector tip 350 through seal 350 to cylinder head 100, and seal 350 attenuates the solid-borne sound.

Furthermore, a corresponding distance is advantageously formed between the injector body 340 and the mounting channel 110, which prevents direct transmission, in particular direct transmission of sound waves, from the injector body 340 to the cylinder head 100.

In this case, the connection within the first sealing device DA1 is still flexible, so that the longitudinal axis of the mounting channel 110 in the cylinder head 100 and the longitudinal center axis X of the fuel injection valve 300 are aligned_MThe distances therebetween within a certain tolerance can be coordinated with respect to each other by means of the fixing element 330.

Subsequently, the through-holes of the cups 210 of the fuel distribution rail 200 are pushed up against the fuel pipe connections 302, so that only the projections of the fuel pipe connections 302 still project on the side of the cups 210 facing away from the cylinder.

The through-holes formed in the segments of the cup 210 or in the cup segments 210A and 210B likewise have only a small clearance with respect to the outer side of the fuel rail 302, so that the aforementioned pre-orientation or pre-positioning of the fuel injection valve 300 takes place, wherein the cup 210 of the fuel distributor rail 200 is fixed in a position provided for this inside the cylinder head, as is not shown in detail.

The pre-positioned fuel injection valve 300 is secured against rotation to cup 210 while fuel nipple 302 is placed on cup 210.

Subsequently, the fuel injection valve 300 is fixed by the fixing member 330.

The fastening element 330 is screwed with its internal thread 330A-1 onto the external thread 302A of the fuel pipe connection such that the contact surfaces a210, a330 are in contact, wherein the screwing action causes a drag torque, with the result that the fuel injection valve 300 is axially moved into its final position.

Longitudinal center axis X of fuel injection valve 300_MThe radial orientation relative to the longitudinal axis of the mounting channel 110 is effected via the contact surfaces a210, a330, so that the fuel injection valve 300 also enters its final position radially.

In other words, after a pre-positioning relative to the longitudinal axis of the mounting channel 110, the longitudinal center axis X of the fuel injection valve 300_MCan be displaced by a small angle, thereby always ensuring a straight fit of the fuel injection valve 300 in the mounting passage 110, thereby reliably avoiding a contact point between the injector body 340 and the mounting passage 110 of the cylinder head 100.

Overall, according to the invention, a very simple and reliable, virtually play-free fastening of the fuel injection valve 300 to the fuel distribution rail 200 is achieved, which fastening is at the same time rotation-proof and, in accordance with existing or intentionally provided tolerances during the pre-positioning, can compensate for existing tolerances of the components connected to one another in the assembled state, wherein the connection requires only little installation space overall.

As already explained, connections which require little installation space are particularly advantageous, especially in the case of lateral injector positions. This connection also ensures that high pressures of more than 400bar can be applied to fuel injection valve 300, since the fastening element of fastening element 330 not only provides the force for the final orientation, but also the force for sealing second sealing device DA2 and third sealing device DA 3.

The second sealing device DA2 ensures a seal between the through hole in the cup and the mounting channel 115.

The third sealing device DA3 ensures a seal between the contact surfaces a210, a330 of the cup 210 and the fixation element 330.

A sealing system is proposed which can be used for the two sealing devices DA2, DA3 or two of the sealing systems described below are used in combination for the one or the other sealing device.

The following sealing system may be used: conical sealing seats, hemispherical sealing seats, metal groove sealing devices, snap-in edges, adhesive bonding, O-rings, hemp strips or metal sealing rings without iron.

In order to clarify the sealing arrangement according to the invention, an embodiment is shown in fig. 1, in which the second sealing arrangement DA2 is configured as a conical sealing seat and the third sealing arrangement DA3 is configured as a metal groove sealing arrangement.

In the case of the second sealing device DA2, the second cup section 210B of the through-opening of the cup 210 is of conical shape, so that the conical body formed on the fuel injection valve 300 between the intermediate pipe connection 303 and the fuel pipe connection engages in the assembled state into the conical through-opening of the second cup section 210B, thereby forming a corresponding sealing fit. The second cup section 210B merges into a first cup section 210A, the first cup section 210A being cylindrical and forming a fuel connection 302 on the end side. It is clear that the intermediate pipe joint 303 does not necessarily have to be arranged between the injector body 340 and the cone.

In the present exemplary embodiment, the third sealing device DA3 is implemented as a metal groove sealing device, wherein opposing grooves S210 and S330 are formed in the opposing contact surfaces a210, a330, which grooves surround in the cup 210 and in the fastening element 330. A sealing element, in particular a copper seal, is inserted into at least one of the recesses S210 and S330, which copper seal ensures the tightness between the cup 210 and the fastening element 300 after the corresponding mounting fastening element 330 and the fuel injection valve 300 have been clamped, as described above.

The invention thus achieves, in conjunction with the sealing of the fuel injection valve 300 relative to the fuel distribution rail 300, an easy-to-implement axial fixing and radial orientation of the fuel injection valve 300 and a low-noise arrangement of the fuel injection valve 300 in the mounting channel 110.

In summary, the installation is based on the following steps: a) introducing the fuel injection valve 300 into an opening provided for this purpose in the cylinder head 100, and b) placing the fuel distribution rail 200 through a through-opening in the fuel distribution rail 200 onto a pin-shaped extension of the fuel injection valve 300, which is referred to as a fuel nipple 302, and c) fixing the fuel distribution rail 200 to the cylinder head 100, which cylinder head 100 serves as a mounting element for the fuel distribution rail 200, and finally d) fixing the fuel injection valve 300 to the fuel distribution rail 200 by means of a fixing element 330 in the form of a screw head.

List of reference numerals

100 cylinder head

110 installation channel

110A step part

115 combustion chamber

200 fuel dispenser

201 opening

210 mounting element, cup

210A first cup section having a cylindrical opening

210B second cup section with a conical or spherical opening

A210 surface facing away from the cylinder (cup side contact surface)

S210 (on the cup side) groove

300 fuel injection valve

301 opening

302 fuel pipe joint

302A external thread

303 middle pipe joint

320 transition element

330 fixing element

330A blind hole

330A-1 internal thread

A330 Cylinder-facing surface (contact surface on the fixing member side)

S330 groove (side of fixed element)

340 injector body

340A step part

350 fuel injector tip

350A sealing element

DA1 first sealing device

DA2 second sealing device

DA3 third sealing device

X_MLongitudinal center axes of fuel injection valve 300 and cup 210 and of fastening element 330