EP4423384A1 - Fuel injection valve for internal combustion engines - Google Patents

Abstract

A fuel injection valve (10.1) is described, comprising a housing (12) which has an injection valve seat (18) and a nozzle body (16), a high-pressure chamber (26) which runs from a high-pressure fuel inlet (24) to the injection valve seat (18), an injection valve member (56) which is arranged adjustably in the housing (12) and has a valve sealing surface (57), wherein the injection valve member (56) has a needle (58) which is arranged so as to follow the valve sealing surface (57) and protrudes into a nozzle chamber (17), wherein the valve sealing surface (57) interacts sealingly with the injection valve seat (18) in order to connect the nozzle chamber (17) to the high-pressure chamber (26) and in order to disconnect the nozzle chamber (17) from the high-pressure chamber (26), wherein the nozzle body (16) has at least one first injection opening (161) which emanates from the nozzle chamber (17) and at least one second injection opening (162) which emanates from the nozzle chamber (17), wherein the at least one first injection opening (161) and the at least one second injection opening (162) are arranged at different levels, and the needle (58) is configured to interact with a side wall (164) of the nozzle chamber (17) in order to close and open the at least one first injection opening (161) and/or the at least one second injection opening (162).

Description

FUEL INJECTION VALVE FOR INTERNAL COMBUSTION ENGINES

field of invention

The present invention relates to a

Fuel injection valve for intermittent injection of fuel into the combustion chamber

internal combustion engine .

Background of the Invention

Fuel injectors are used to inject fuel directly into the combustion chamber

Internal combustion engine, especially for diesel engines, used. In addition to conventional diesel engines, so-called dual-fuel systems have been proposed in recent years as efficient and low-emission alternatives for ships, power-generating engines and, in some cases, commercial vehicles.

A challenge in dual-fuel systems is the required separate injection of fuel, such as diesel or marine diesel oil, as a pilot jet when operating with

Gas as the main fuel. In particular, for the

Pilot injection of fuel from the conventional

fuel injection different injection parameters, such as injection quantity, injection pressure,

Injection configuration etc. desired, which requires an extension of conventional injection systems.

A dual-fuel injection system is e.g

US2007/0246561 A1 with a fuel injection system described, which is designed two different

generate spray patterns via independently controlled adjacent needle valve elements. The

Fuel injection system includes a

A fuel injection injector comprising an injector body defining a hollow interior configured to receive pressurized fuel, a first

Nozzle whose spray configuration is configured to provide a first fuel spray pattern and a second

A nozzle having a spray configuration configured to provide a second fuel spray pattern that is different than the first fuel spray pattern. The first and second nozzles are adapted to flow fuel supplied from a common source into one

to inject the combustion chamber. The

The fuel injection injector further includes a first

Needle valve element located in the hollow interior of the

Injector body is positioned, the first

Corresponds needle valve element of the first nozzle, and a second needle valve element, which is in the hollow interior of

Is fuel injection zoisnijteikotnoirert and corresponds to the second nozzle. The second needle valve element is from the first

Needle valve element spaced and adjacent to the first

Arranged needle valve element. The first and second nozzles are configured to be supplied from a common source

to inject fuel into a combustion chamber.

Presentation of the invention Against the background of the extended requirements for dual

Fuel systems e.g. in relation to the different

Fuels, liquid and gaseous, or the introduction of the

As an ignition source in gas operation, it is typically desirable to simplify the design of dual-fuel systems while providing reliable controllability of the injection events.

It is therefore an object of the present invention

Fuel injection valve, in particular for a dual-fuel

System to provide, which at least partially improves the prior art.

This object is achieved with a fuel injection valve having the features of the independent claim. beneficial

Embodiments of the invention are in the dependent

Claims and in the present description and the

figures given.

The invention relates to a fuel injection valve for intermittent injection of fuel into the

Combustion chamber of an internal combustion engine, comprising a one

Housing defining the longitudinal axis

High-pressure fuel inlet, an injector seat and a

Has nozzle body. In the housing, a high-pressure chamber is arranged from the high-pressure fuel inlet to

Injector seat runs. Next in the housing is a

Injection valve member arranged adjustable with a valve sealing surface in the direction of the longitudinal axis. The

The fuel injection valve further includes a compression spring which closes the injection valve member with a closing force directed towards the injection valve seat applied . The compression spring is preferably on the one hand

Injection valve member supported and on the other hand relative to

Housing stationarily supported.

The fuel injector further includes a hydraulic control device for controlling the movement of the

Injection valve member along the longitudinal axis, wherein the

Injection valve member a needle arranged downstream of the valve sealing surface, which is inserted into a downstream of the

Injection valve seat arranged nozzle chamber protrudes having. The valve sealing surface is formed with the

Injection valve seat for connecting the nozzle space with the and

Separating the nozzle chamber from the high-pressure chamber to cooperate in a sealing manner.

The nozzle body has at least a first injection opening emanating from the nozzle chamber and at least a second one from

Nozzle chamber outgoing injection opening for injecting

Fuel in the combustion chamber of the internal combustion engine, wherein the at least one first injection port and the at least one second injection port on different

Heights are arranged in relation to the longitudinal axis. The needle is formed with a side wall of the nozzle chamber for

Closing and opening the at least one first

Injection opening and / or the at least one second

Injection opening to cooperate (or to close and

opening at least one of the at least one first

Injection opening and the at least one second

injection port to cooperate).

The fuel injection valve preferably further comprises a

Guide part, in which a control piston of the Injection valve member is guided in a sliding fit; a

Intermediate part, which together with the guide part and the

Control piston delimits a control chamber; wherein the hydraulic control device is formed by

Change in pressure in the control room the movement of

to control injector member along the longitudinal axis; the hydraulic control device having an intermediate valve with a mushroom-shaped intermediate valve member, which has a shank guided in a guide recess of the intermediate part and a head, and a head formed on a side of the intermediate part facing the head and interacting with the head

Intermediate valve seat includes, wherein the intermediate valve member in an open position a connection between a with the

High-pressure chamber associated fuel high-pressure permit and the

Control room releases and in a closed position

Connection between the fuel high-pressure permit and the

Control room interrupts as well as the control room of one

separates valve space except for a throttle passage; and an electrically actuable actuator assembly for connecting the valve space to and disconnecting the valve space from a

Low Pressure Fuel Return .

The intermediate valve member can in the open position a second or further connection between the

Release the high-pressure fuel inlet and the valve chamber and, in the closed position, interrupt the second or further connection between the high-pressure fuel inlet and the valve chamber.

With the mushroom-shaped intermediate valve member, precise controllability of the opening movement of the Injection valve member and a rapid closing process of the injection valve member can be achieved. Furthermore, can

Multiple injections can be realized with very short time intervals.

Because the needle protruding into the nozzle space interacts with the side wall of the nozzle space to close and open the at least one first injection opening and/or the at least one second injection opening, fuel can be injected in a targeted manner through the at least one first injection opening and/or the at least a second injection port may be provided. Since the at least one first injection port and the at least one second injection port are also on different

Heights are arranged in relation to the longitudinal axis of the housing, the at least one first injection opening and the at least one second injection opening can be selectively closed or opened by controlling and adjusting the injection valve member or the needle along the longitudinal axis of the housing. Controlling and adjusting the

Injection valve member can by the hydraulic

Control device can be achieved in more precise and reliable catfish. The fuel injection valve therefore makes it possible to use the at least one first injection opening and the at least one second injection opening with the same injection valve member using two different

Injection processes with different injection parameters, such as injection quantity, injection pressure, injection duration,

Injection pattern etc. to provide.

Those skilled in the art is related to the present

Invention aware that under «Closing» the least a first injection opening and/or the at least one second injection opening does not necessarily have to be understood as “sealing”, but covering or covering the at least one first injection opening and/or the at least one second injection opening can be sufficient.

Therefore, even with a closed at least one first and/or at least one second injection opening

(compared to the injection quantity through an open

Injection port) low (tolerable) leakage over a

Gap between the needle and the inner side wall of the

Nozzle space occur.

Preferably, when closing the at least one first

Injection opening and the at least one second

Injection opening of the nozzle space by sealing concerns of

Valve sealing surface of the injector valve member

Injection valve seat separated from the high-pressure chamber. Although at

Raising the injector member from the injector seat

Nozzle chamber is fluidly connected to the high-pressure chamber can by suitable arrangement (i.e. at a suitable height along the longitudinal axis of the housing) the at least one first injection opening and / or the at least one second

Injection opening can be achieved in the side wall of the nozzle chamber that the at least one first injection opening and / or the at least one second injection opening remains closed until the injection valve member or the

Needle is raised to a height at which the at least one first injection port and / or the at least one second injection port opened and with the

High-pressure space is connected. The injection timing through the at least one first injection port and / or at least one second injection port can therefore through the

Height in the side wall on which the injection openings are arranged and/or the length or stroke of the needle can be adjusted.

The needle is preferably in the region of the at least one first injection opening and the at least one second injection opening

Injection opening can be guided with a sliding fit in the nozzle chamber. Due to the sliding fit in the nozzle chamber, a closure that is sufficient for practical purposes can be achieved from the side wall of the

Nozzle chamber outgoing injection openings are provided by the needle.

Preferably, the fuel injector has a

variety, e.g. two, four, six or more radially symmetrically arranged first injection openings at a first height and a plurality, e.g. two, four or six, of radially symmetrically arranged second ones

Injection openings at a second level.

In an advantageous embodiment, the at least one first injection opening and the at least one second

Injection opening different minimum diameters.

By choosing different minimum diameters for the at least one first injection opening and the at least one second injection opening, different

Injection cross sections are provided for different injection purposes. For example, a smaller

Minimum diameter for a pilot jet injection or

Pilot injection can be selected. a bigger one

Minimum diameter, on the other hand, can be used for example can be selected as the main injector for e.g. diesel or heavy fuel oil.

In the case of a multiplicity of first injection openings, the first injection openings preferably have the same ones

Minimum diameter and particularly preferably have the same

geometries. However, configurations are also conceivable in which the plurality of first injection openings have different geometries and/or

have a minimum diameter. According to one

Plurality of second injection ports thereof

Minimum diameters are preferably the same and their geometries are particularly preferably the same. However, configurations with different geometries and/or minimum diameters are also conceivable given the large number of second injection openings.

In an advantageous embodiment, the at least one second injection opening is arranged downstream of the at least one first injection opening and has a smaller diameter

Minimum diameter than the minimum diameter of the at least one first injection opening.

The at least one second injection port can be used for a

Diesel pilot injection can be used to ignite a lean (natural) gas/air mixture. Since the at least one second injection opening is arranged downstream of the at least one first injection opening, the at least one second injection opening can be raised by raising the

Needle of the injector member are opened while the

Needle holding at least one first injection port further closed. With this configuration Injection ports, it is therefore made possible to selectively at least one second injection port for a

to open pilot injection.

In an advantageous embodiment, the needle is designed in a closed position of the

Injection valve member, the at least one first

Injection opening and the at least one second

To close injection opening, in a first open position of the injection valve member, the at least one second

To open injection port and the at least one first

to close injection port, and in a second

Open position of the injection valve member, the at least one second injection opening and the at least one first

to open the injection port.

At least three (closed/opened) configurations can therefore be provided with the fuel injector and the needle, which can be used for different operating modes or operating phases. For example, the first open position can be used for a pilot jet injection if the at least one second

Injection opening has a smaller minimum diameter than the at least one first injection opening. The second

Open position, on the other hand, can be used, for example, for diesel or heavy oil operation, in which both the at least one first and the at least one second

injection openings are open and that

Fuel injection valve as the main injector for diesel or

Heavy oil can be used as the main fuel. The fuel injection valve can therefore in gas operation via the example at least one second injection port

Provide pilot injection.

However, the invention offers the advantage that

Fuel injection valve also for a diesel or

Heavy fuel oil operation can be used. A pre-injection or pilot injection and the main injection via the

Opening of the at least one first and the at least one second injection port are provided.

In diesel or heavy oil operation, in one variant for a pre-injection, e.g. the at least one second

Injection opening can be opened and closed again after the pre-injection. After a certain interval, the at least one first injection port and the at least one second injection port for the

Main injection are opened.

In a further variant, in the diesel or

A staged injection can be carried out with heavy fuel oil operation. For example, the at least one second

Injection opening are opened for a pilot injection and the at least one first injection opening is additionally opened for a main injection. The time course of the stepped injection, in particular the duration of the

Pre-injection can by varying the distance between the at least one second injection port and the at least one first injection port along the

Longitudinal axis can be adjusted. A short pre-injection can, for example, by a small distance between the at least a second injection port and the at least one first injection port are reached along the longitudinal axis.

For a particularly short pre-injection, the at least one second injection opening and the at least one first injection opening can be arranged in such a way that, for example, the at least one first injection opening with a larger minimum diameter is opened during the opening process of the at least one second injection opening. This can be achieved, for example, in that the height of the at least one second injection opening corresponds to the height of the at least one first injection opening along the

Longitudinal axis «overlapped». In an “overlapping” arrangement, the at least one first and the at least one second injection openings can be arranged in the horizontal circumferential direction of the

Nozzle body can be arranged alternately or staggered in order to avoid or reduce a disadvantageous weakening of the side wall of the nozzle body.

The fuel injector therefore offers the advantage that different fuel injectors can be used with the same fuel injector

Types of use, in particular on the one hand as a pilot jet injector and on the other hand as a main injector with variably adjustable

Pilot injection can be achieved.

The closed position also offers the advantage that both the at least one first and the at least one second

Injection opening are sufficiently closed by a side wall of the needle and therefore advantageously a leakage of fuel from the nozzle chamber into the combustion chamber Internal combustion engine can be minimized or virtually eliminated.

In one embodiment, the needle has an inner, im

Essentially along the longitudinal axis oriented bore, which emanates from a lower end of the needle and is formed in the first open position of the

Injection valve member, the at least one second

To connect the injection port to the high-pressure chamber, and to connect the at least one second injection port and the at least one first injection port to the high-pressure chamber in the second open position of the injection valve member.

Through the inner bore in the respective

Open positions fuel from the high-pressure chamber in the at least one first and / or at least one second

get into the injection port and thereby into the combustion chamber

Internal combustion engine are injected. Because the inner

Bore emanates from the lower, i.e. downstream, end of the needle and is therefore delimited laterally by a side wall of the needle, the needle can easily pass through

Movement along the longitudinal axis with the side wall of the

Nozzle chamber for closing and opening the injection openings

interaction. Preferably, the inner bore of the needle is connected to the nozzle chamber, so that the inner bore

High-pressure chamber in the respective open positions on the

Can connect nozzle space with the injection ports.

In one embodiment, the nozzle chamber has an upper nozzle chamber arranged downstream of the high-pressure chamber and a lower nozzle chamber arranged downstream of the upper nozzle chamber on, ,wherein the lower nozzle space via the inner bore of the

Needle is connected to the top nozzle space, wherein the at least one first injection port and the at least one second injection port emanate from the bottom nozzle space.

The injection valve seat preferably adjoins the upper nozzle chamber above or upstream. Preferably, in the respective open positions of the high-pressure chamber with the

Connected to the upper nozzle chamber, so that the high-pressure fuel can pass through the upper nozzle chamber into the inner bore of the needle and from there through the lower nozzle chamber into the at least one first and/or second injection opening.

In one embodiment, the inner bore of the needle is connected to the upper nozzle chamber via at least one transverse bore in a side wall of the needle.

If there are several transverse bores, the transverse bores can be arranged at different heights of the needle. With multiple

The total entry cross-section into the inner bore can be increased with transverse bores. This can advantageously due to the double deflection of

Flow through the needle occurring pressure loss are compensated. By arranging the several transverse bores at different heights of the needle, a weakening of the

Side wall of the needle can be reduced or prevented. In one embodiment, a number of transverse bores in the needle are arranged radially symmetrically. In one embodiment, several transverse bores in the needle have mirror symmetry.

In certain configurations, one or more of the at least one transverse bore can be at least partially in a below the injection valve seat and above the Bore section arranged in the upper nozzle space

Injection valve part, which is connected to the upper nozzle space, open.

In certain configurations, one or more of the at least one transverse bore can open partially into the upper nozzle chamber and partially into the bore section of the injection valve part.

In certain configurations, one or more of the at least one transverse bore can open into the upper nozzle space.

The mouth of the one or more of the at least one

Cross bore in the upper nozzle space and / or

Bore portion of injector part may be in

Change dependency of the momentary stroke of the needle.

In one embodiment, the needle is a slip fit

Under-nozzle space out.

For emanating from the lower nozzle space injection ports

Needle thanks to the sliding fit for closing and opening the

Injection openings quasi-sealing with the side wall of the

Sub-nozzle space cooperation.

In one embodiment, the diameter of the

Nozzle space at the transition vvoomm upper nozzle space to

Sub-nozzle space, preferably via a conical step.

In particular, such a lower portion of the needle in the

Lower nozzle space for closing and opening the

Injection openings, preferably in a sliding fit, out and find a continuation of an upper section of the needle with a game in the upper nozzle space. In one embodiment with at least one transverse bore of

The needle can have at least one transverse bore in an upper

Section of the needle can be arranged in such a way that the at least one transverse bore is in the upper nozzle chamber and/or in a bore section of the upper nozzle chamber that is connected to it

Injection valve part is located and so connects the upper nozzle space with the inner bore.

The lower nozzle space can therefore primarily to provide a

Quasi-sealing surface between the side wall of the needle and the

Side wall of the lower nozzle space for closing or opening the

Injection openings and the upper nozzle space primarily for

Provision of the connection with the high-pressure space in one

Open position, preferably by connecting the

High-pressure chamber with an inner bore of the needle are used.

In one embodiment, the sub-nozzle space has a first

Section and a downstream of the first section arranged second section with a reduced diameter compared to the first section.

By dividing the sub-nozzle space into several

Sections with different diameters can in particular with a suitable arrangement of

Injection ports more options for the selective

Closing and opening of the injection openings are made possible.

For example, in an advantageous embodiment, the at least one second injection opening extends from the second section of the sub-nozzle chamber. Furthermore, preferably the at least one first

Injection port from the first section of the sub-nozzle space.

By separately arranging the at least one second

Injection opening in the second section and the at least one first injection opening in the first section, the at least one second injection opening and the at least one first injection opening can be spaced apart better and in particular more flexibly, in particular without having to increase the maximum stroke of the needle. With a suitable arrangement of at least one second

Injection opening in the second section and the at least one first injection opening in the first section, the required maximum lift of the needle can also be reduced.

In one embodiment, the needle has a first

Needle section, which is in the first section of the

Sub-nozzle chamber is guided in a sliding fit and a second needle section adjoining the first needle section, which in the second section of the sub-nozzle chamber in

Sliding fit is feasible.

The needle can therefore at least one second

Close the injection port through the second needle section and close the at least one first injection port through the first needle section. By subdividing the

Needle in several needle sections, the needle can advantageously in the respective sections of the

Sub-nozzle space to be closed in each case

Injection openings are adjusted. Preferably, the second needle section between the

Closing position and the first open position of

Injection valve member in the second section of

Under-nozzle space out in sliding fit.

The subdivision of the sub-nozzle space into several sections, in particular into first and second sections, and the corresponding subdivision of the needle into several

Needle sections, in particular in a first and second

Needle section for closing the at least one first injection opening and the at least one second

Injection opening, as already described, offers the advantage that the at least one first injection opening and the at least one second injection opening can be spaced apart from one another better and in particular more flexibly.

In particular, the at least one first

Injection opening and the at least one second

Injection opening along the longitudinal axis of the housing are further spaced apart without the maximum

to increase the stroke of the needle. Advantageously, the maximum stroke of the needle does not have to be increased, since the stepped shape of the lower nozzle space (due to the first and second sections) and the needle (due to the first and second needle sections) does not require that the needle with its lower End is lifted to above the level of at least one first injection opening also to reach the second open position. Rather, it is advantageously sufficient if the needle with the

Graduation between the first and second needle section on the

Height of the at least one first injection port is also raised. In one embodiment, the first and the second close

Needle section on a conical gradation together.

The first and the second section of the sub-nozzle space can likewise adjoin one another via a conical step.

In one embodiment, the first and / or the second

The needle section and/or the first and/or second section of the sub-nozzle space can be designed in such a way that when the needle is raised, the at least one first injection opening is opened before the at least one second injection opening is opened. This can be achieved in particular if the length of the second needle section or the total length of the second needle section and the conical

Graduation is greater than the distance between the at least one second injection port and the at least one first injection port along the longitudinal axis. With such a configuration, e.g

Fuel injector are provided, in which a pre-injection or when operating with gas as

Main fuel a pilot jet injection is made through the at least one first injection port.

The functionalities of the at least one second

Injection opening and the at least one first

Injection opening can therefore by suitable geometries of the

Sub-nozzle space or its first and second sections and / or the needle or its first and second

Needle sections, and further with a suitable adjustment of the minimum diameter of the at least one first and / or the at least one second injection opening, are interchanged.

In one embodiment, the nozzle space is formed like a blind hole with a bottom, the nozzle space in the

Closed position of the injection valve member from a lower end of the needle and the bottom of the blind hole-like

Nozzle chamber has limited free space.

At an inner one emanating from the lower end of the needle

The free space is therefore with the inner bore of the needle

bore connected. In an open position of

Injection valve member can increase the clearance and at least partially from a lower end of the needle and the

Be limited bottom of the blind hole-like nozzle space, wherein the

Fuel from the high-pressure chamber via the inner bore of the

Needle and can get into the at least one second or at least one first injection opening via the enlarged free space. In the closed position of

Injection valve member, the space is preferably closed to the combustion chamber of the internal combustion engine, so advantageously no significant leakage of

Fuel can occur in the combustion chamber.

In one embodiment, the nozzle chamber has an undercut at a downstream end. In particular, the free space can have an undercut.

In one embodiment, the injection valve seat is in one

Injection valve part formed, wherein the nozzle body on

Injection valve part, preferably via a union nut, is releasably attached. The detachable attachment of the nozzle body on

Injector part offers the advantage of a simple

Interchangeability of the nozzle body, since the nozzle body due to wear of the at least one first and / or at least one second injection opening in the

is usually a consumable part.

In one embodiment, the needle preferably has a

Steel-made sleeve, which is designed to cooperate with the side wall of the nozzle chamber for closing and opening the at least one first injection opening and/or the at least one second injection opening.

With the sleeve can advantageously an improved

Closing the injection openings can be achieved. Furthermore, the sleeve advantageously provides protection for the

side wall of the needle and can be easily replaced if necessary.

Preferably, the sleeve with a radially against the

Side wall of the nozzle chamber directed clamping force applied.

By radially directed against the side wall of the nozzle chamber clamping force closing the

Injection openings are further improved.

In one embodiment, the at least one second

Injection opening an outgoing from the nozzle chamber first

Opening section and a second opening section adjoining the first opening section, wherein the

Diameter of the second opening portion greater than that

Diameter of the first opening portion is. Preferably, the second opening section opens into the

Combustion chamber of the internal combustion engine. Through the graded

The shape of the at least one second injection opening can improve the atomization of fuel for the

Pilot injection can be achieved because the at least one second injection opening on a reduced length, namely along the first opening portion, a narrow

Has diameter and thanks to the second opening portion has a widening profile. Because of this

Profile can be the most advantageous ratio of

Hole diameter and hole length of the first opening section of the at least one second injection opening can be realized in order to achieve optimal atomization of the pilot jet in the

to reach the combustion chamber.

In one embodiment, the at least one first

Injection opening and / or the at least one second

Injection opening dated via a trough-shaped recess

nozzle room off.

Preferably, the transitions between the

Injection openings and the side wall of the nozzle chamber are rounded. In particular, the transitions between the injection openings and the trough-shaped ones are preferred

Rounded recesses. Through the trough-shaped recess, the transitions between the injection ports and the

Side wall of the nozzle space can be rounded more easily. One

Rounding off the transition between an injection opening and the side wall of the nozzle chamber or a trough-shaped one

Recess offers the advantage of a more stable over time

Flow of fuel through the injection port. The throttle passage is preferably formed on the intermediate valve member, particularly preferably on the head of the intermediate valve member. However, the throttle passage can also be

be formed intermediate part. In other variants, the

Throttling passage may be formed between the intermediate valve member and another component, such as through a gap between the intermediate part or the guide part. The throttle passage formed on the intermediate valve member can on the side facing away from the control chamber in an am

Intermediate valve member excepted, belonging to the valve space

open blind hole. Preferably, the throttle passage is formed in the intermediate valve member adjacent to the control chamber. The throttle passage and the blind hole are preferably formed centrally to the longitudinal axis.

As a result, on the one hand ddeerr throttle passage can be formed with the desired length and on the other hand

Blind hole form part of the valve chamber.

The head of the mushroom-shaped intermediate valve member can have a sealing surface running at a radial distance around the shaft, with which the head—in the closed position of the intermediate valve member—can bear sealingly against an intermediate valve seat formed on the intermediate part, forming an annular sealing surface. The stem of the mushroom-shaped intermediate valve member can be guided with a close sliding fit in the guide recess of the intermediate part. On the side facing the shank and thus the intermediate part, a circular sealing bead can be formed on the head that protrudes in relation to the remaining area of this side of the head End face can form the sealing surface of the intermediate valve member.

The intermediate part, the shaft and the head can be one

Limit the annular space into which a high-pressure fuel inlet connected to the high-pressure space can open. The

An annular space can run around the shank and be delimited in the radial direction by the shank and the intermediate part

Have inner annular space, which can be excluded from the shaft itself, the fuel high-pressure admission in the

Inner ring space can open. The valve chamber can have a

Throttle approval with the high-pressure chamber and thus the

be connected to the high pressure inlet. The annular space can have a split annular space adjoining the inner annular space. In

Closing position of the intermediate valve member can this

Clearance annulus through a circumferential gap between the

Be formed intermediate part and the head of the intermediate valve member.

The inner annular space can be formed on the shaft of the intermediate valve member by a circumferential annular groove which is open towards the outside in the radial direction and which, in the direction of the

Seen along the longitudinal axis, can have such a dimension that the mouth of the high-pressure inlet is always at least approximately completely in the area of the annular groove. Next, the annular groove can connect directly to the head.

In the case of an intermediate valve member which, in the open position, releases a second connection between the high-pressure fuel inlet and the valve chamber, the valve chamber can be filled with fuel via the second connection, resulting in a more rapid opening movement of the intermediate valve member allows. In particular, the second connection

Filling of the valve space compared to a

Fuel injection valve, in which the filling of the

valve space, e.g. solely from the control space via a

Throttle passage is improved. Advantageously, therefore, the valve chamber already at a small

Opening movement of the intermediate valve member via the second

connection to be filled. As far as the throttle passage is concerned, it is advantageously sufficient if the fuel flow from the control chamber into the valve chamber through the

Throttle passage the initially small opening movement of the

Intermediate valve member causes, since then the valve chamber can be filled with a large amount of fuel via the second connection.

The fact that the intermediate valve member interrupts the second connection between the high-pressure fuel inlet and the valve chamber in the closed position can advantageously be avoided in the closed position of the

Intermediate valve member fuel flows from the high-pressure chamber via the second connection into the low-pressure fuel return. By interrupting the second connection between the high-pressure fuel inlet and the valve chamber in the closed position of the intermediate valve member, loss of fuel and wear due to relaxation of the

Fuel from the high-pressure chamber into the valve chamber during which

Injection process can be reduced or reduced and at the same time rapid filling of the valve chamber for the

Opening movement of the intermediate valve member can be achieved.

In one embodiment, the second connection runs between the high-pressure fuel inlet and a through the Shaft of the intermediate valve member extending bore which

is part of the valve chamber. Preferably, the hole is as

Blind hole formed.

In one embodiment, the head lies in the closed position of the intermediate valve member with a side facing the intermediate part over a first radial distance running around the shaft or the guide recess

Sealing surface to form a first, in the circumferential direction self-contained annular sealing surface and in a second radial distance around the shaft or the

Guide recess running, second sealing surface under

Formation of a second annular sealing surface, closed in the circumferential direction, on the intermediate valve seat, the first radial distance being greater than the second radial distance

distance is.

In one embodiment is on the side of the head facing the intermediate part or on the side facing the head

Side of the intermediate part, a first annular sealing bead is formed with a first end face, which forms the first sealing surface.

In one embodiment is on the side of the head facing the intermediate part or on the side facing the head

Side of the intermediate part, a second annular sealing bead is formed with a second end face, which forms the second sealing surface.

In one embodiment, the intermediate part on the

Head side facing at least one gradation and the

Head on the side facing the intermediate part at least one gradation, in the closed position of the Intermediate valve member mutually offset edges of

Gradations of the intermediate part and the head each radially delimit the first and/or the second ring sealing surface.

In one embodiment, a gradation of the

Intermediate part an inner annular space, which in

Closing position of the intermediate valve member by the

Intermediate part, the shaft and the head is limited.

In one embodiment, the high-pressure fuel inlet runs in the intermediate part in such a way that the high-pressure fuel inlet in the closed position of the intermediate valve member in one

Opens gap annular space, which is formed in the closed position of the intermediate valve member between the intermediate part and the head and is radially delimited by the first and the second annular sealing surface.

In one embodiment, the second connection includes a

Approval of the intermediate valve member, which with a first

End opens into the valve chamber and opens with a second end to an outside of the intermediate valve member. On the

Admission can advantageously, as already explained above, the valve chamber are filled to the opening movement of the

to support intermediate valve member. Preferably, the flows

Admission with the first end into the blind bore which runs through the stem and is part of the valve chamber.

In one embodiment, the second end of the inlet opens onto the outside of the intermediate valve member in such a way that the second end is arranged at a radially smaller distance from the shaft than the second annular sealing surface in the closed position of the intermediate valve member. In one embodiment, the second connection includes a

Passage which is formed by a clearance of at least 10 μm, preferably between 20 μm and 50 μm, existing in the radial direction between the shaft and the guide recess.

In one embodiment, the shank has two annular projections spaced apart from one another in the longitudinal direction of the shank.

In one embodiment, the ring projections each have

Circumferentially at least one chamfer, the second

Connection includes a passage, which of a

Space between the at least one chamfer and the

Guide recess is formed. Through at least one

Chamfer can play between the shaft and the

Guide recess are kept sufficiently small, which allows better centering of the shaft, i.e. avoiding or reducing an eccentric or inclined position of the

shank, allowed . At the same time, despite a small amount of play, due to the at least one chamfer between the outside of the shaft and the guide recess, a sufficient

Passage formed by the gap between the at least one chamfer and the guide recess are provided, which as a passage of the second

connection serves.

In one embodiment, the ring projections each have

Circumferentially two or three chamfers.

In one embodiment (without ring projections), the shaft has at least one chamfer in the circumferential direction, the second

Connection includes a passage, which of a

Space between the at least one chamfer and the Guide recess is formed. Through at least one

Fase can, as already explained, the game between the

Shaft and the guide recess are kept sufficiently small, which allows for better centering of the shank, i.e. under

Avoiding or reducing an eccentric or inclined position of the shaft. At the same time, despite a small game due to the at least one chamfer between the

Outside of the shaft and the guide recess, a sufficient passage formed by the gap between the at least one chamfer and the

Guidance, are provided, which as

Passage of the second connection is used.

In one embodiment, the shank has two or three chamfers in the circumferential direction.

In one embodiment, the second connection comprises a bore running through the head of the intermediate valve member, which at least partially forms a valve chamber passage connected to the valve chamber and opens at one end on a side of the head facing the intermediate part.

In one embodiment, the valve chamber passage runs in the intermediate valve member in such a way that the valve chamber passage in the closed position of the intermediate valve member becomes one

Opens gap annular space, which is formed in the closed position of the intermediate valve member between the intermediate part and the head and is radially delimited by the first and the second annular sealing surface.

In one embodiment, the fuel injector has a front in the closed position of the intermediate valve member Intermediate part, shank and head limited annular space, in which the fuel high-pressure inlet opens.

List of Characters

Embodiments of the invention are explained in more detail using the following figures and the associated description. They show schematically:

Fig.1 in longitudinal section a representation of a

embodiment of a

fuel injector;

FIG. 2 enlarged compared to FIG. 11, the lower or downstream area of the framed there with a rectangle marked II

Embodiment of the fuel injector;

3 shows a section of a further embodiment of a fuel injector in one

longitudinal section;

Fig.4(a)-(c) three configurations of the injection valve member of the embodiment shown in Fig.3

fuel injector;

5 shows a section of a further embodiment of a fuel injector in one

longitudinal section;

6 shows a section of a further embodiment of a fuel injection valve in one

longitudinal section . Description of exemplary embodiments

In the description of the figures are corresponding for each other

Parts of the embodiments used the same reference numerals.

Figure 1 shows an embodiment of a

Fuel injector 10.1 for intermittent

Injecting fuel into a combustion chamber

internal combustion engine. Fuel injection valve 10.1 has a housing 12 defining a longitudinal axis L with a housing body 14, a nozzle body 16, a

Injection valve part 15, on which an injection valve seat 18 is formed, uunndd an actuator receiving body 20, which between the housing body 14 and the

Injection valve part 15 is arranged. one on

Injection valve part 15 supporting union nut 22 takes on the actuator receiving body 20 and is on the

Housing body 14 threaded. EEiinnee ssiicchh aamm nozzle body 16 supporting union nut 23 is on the injector part

15 unthreaded . The housing body 14 and the

Actuator receiving body 20, as well as this and that

Injection valve parts 15 rest against one another at the ends, are pressed against one another in a sealing manner by means of the union nut 22 and are aligned with one another in the direction of the longitudinal axis L.

The nozzle body 16 and the injection valve part 15 are pressed against one another in a sealing manner by means of the union nut 23 and aligned with one another in the direction of the longitudinal axis L.

The outer shape of the housing 12 is at least approximately circular-cylindrical. On the end face of the nozzle body 16 facing away from

Housing body 14 is a high-pressure fuel inlet 24 is arranged, from which inside the housing 12 - through the

Housing body 14, the actuator receiving body 20 and the

Injection valve part 15 up to the injection valve seat 18

High-pressure chamber 26 runs. The high-pressure fuel inlet 24 is formed by a valve carrier 28 which has a basket-like hole filter 32 for retaining any

carries foreign particles in the fuel.

A structure and a mode of operation of the unit designed as a cartridge mmiitt the valve carrier 28 and the

Hole filters 32 are disclosed in document WO2014/131497 A1.

The high-pressure fuel inlet 24 and the valve carrier 28 with

Hole filter 32 can also be formed, as in

Document WO2013/117311 A1 is disclosed. The valve carrier 28 can also be one that is not shown in FIG

Have check valve with eeiinneemm disk-shaped valve member, which cooperates with a valve seat formed on the valve carrier 28. The disc-shaped valve member of the

Check valve can have a bypass bore. The

Check valve can flow fuel supplied via a high-pressure feed line into the high-pressure chamber 26 practically without obstacles, but the outflow of

Fuel from the high-pressure chamber 26 in the

Prevent high pressure feed line except through the bypass. A possible embodiment of

High-pressure fuel inlet 24 and a check valve, as well as a rod filter instead of the hole filter 32 is known from document WO2009/033304 A1. The corresponding Disclosure of the above documents applies through

reference as incorporated in the present disclosure.

Adjoining the valve carrier 28 is the high-pressure chamber

26 formed on the housing body 14, discrete

Storage chamber 34 on the other hand over a

Flow channel 36 of the high-pressure chamber 26 with the

Injection valve seat 18 is connected.

A sizing and operation of the discrete

Storage chamber 34 together with a check valve with

Bypass is disclosed in document WO2007/00927 9 A1; the corresponding disclosure is deemed to be incorporated into the present disclosure by reference.

Instead of a check valve, in certain

Embodiments also be provided a stationary immovable throttle.

In a recess of the actuator receiving body 20, an electrically operated actuator assembly 38 is received, which is spring-loaded in one direction and in the other direction by means of an electromagnet

Actuator assembly 38 movable ram 40 is intended to close a low-pressure outlet 42 to a

valve space 44, from a low pressure fuel return 46

(see Figure 2) to separate, and release the low-pressure outlet 42 to the valve chamber 44 and the low-pressure

To connect fuel return 46 together. The designated 48 longitudinal axis of the plunger 40 and thus the

Actuator assembly 38 runs parallel and eccentrically to

Long axis L Parallel to the discrete storage chamber, which is arranged at least partially eccentrically with respect to the longitudinal axis L of the housing 12 and thus of the fuel injector 10.1

34 runs from an electrical connection 50 through the

Housing body 14 to the actuator assembly 38, a channel 52 in which the electrical control line for controlling the

Actuator assembly 38 is added.

The plunger 40 passes through the, a guide element for the

Plunger 40 forming the bottom of the cup-shaped

Actuator receiving body 20. The plunger 40 has a radial

Direction projecting guide wing, with which he am

Guide element is parallel to the longitudinal direction L slidably guided. The guide wings form in

Longitudinally L running passages through which the

Fuel from the low pressure outlet 42 to the low pressure

Fuel return 46 can flow.

Figure 2 shows an enlarged section of the

Fuel injection valve of Figure 1 in the area of the rectangle labeled II.

On the injector part 15 is the conical

Injection valve seat 18 formed, which over the

Flow channel 36 with the Speieherkämmer 34 and thus with the

High-pressure fuel inlet 24 is connected directly. The

Injection valve seat 18 therefore forms a tapering

Section of the interior of the injector part 15 from SO that above or upstream of this tapering

Section a first bore section 61 and below or downstream of this tapering section a second Bore section 62 is arranged with a smaller transverse diameter than the first bore section 61 .

In the housing 12 is adjustable in the direction of the longitudinal axis L, an injection valve member 56 with a conical

Valve sealing surface 57 arranged. Following the valve sealing surface 57 , the injection valve member 56 has a needle 58 which protrudes into a nozzle chamber 17 of the nozzle body 16 which is arranged downstream of the injection valve seat 15 and the second bore section 62 . The valve sealing surface 57 is formed with the injection valve seat 18 for connecting the

Nozzle chamber 17 with and separating the nozzle chamber 17 from

High-pressure chamber 26 to cooperate sealingly.

The injection valve member 56 has the conical

Valve sealing surface 57 facing away from a shoulder 59 on which a compression spring 63 is supported at one end. With its other end, the compression spring 63 is supported at the front on a guide sleeve 64 forming a guide part. The compression spring 63 acts on this

Injection valve member 56 with a towards the

Injection valve seat 18 acting closing force. On the other hand, the compression spring 63 holds the guide member 64 with the

Pressure spring 63 facing away from the end in sealing contact with an intermediate part 66.

In the guide part 64 is in a close sliding fit of about 3 microns to

5 μm, a double-acting control piston 68 formed on the injection valve member 56 is displaceably guided along the longitudinal axis L. The control piston 68, the guide part

64 and the intermediate part 66 delimit a control chamber 70 with respect to the high-pressure chamber 26 . The intermediate part 66 is Part of a hydraulic control device The hydraulic control device 72 can, for example, as in FIG

WO2021/165275 A1 or WO2020/260285 A1, formed by sseeiinn, whose corresponding disclosures

reference shall be deemed incorporated into the present disclosure.

The nozzle body 16 has a multiplicity of first injection openings 161 emanating from the nozzle space 17 and a multiplicity of second injection openings emanating from the nozzle space 17

162 on. The first injection openings 161 are arranged higher than or upstream of the second injection openings 162 with respect to the longitudinal axis L. FIG. The second injection openings 162 have a smaller (minimum) diameter than the first injection openings 161 and can be used for pilot injection or, when operating with gas as the main fuel, for pilot injection. The 5588 needle is a slip fit in one

Under-nozzle space 163 out, so that the side wall 581 of

Needle 58 with the side wall 164 of the lower nozzle space 163 to

Closing and opening the first injection openings 161 and / or the second injection openings 162 interacts quasi-sealing. In the embodiment shown in Figure 2, the needle 58 can be adjusted by adjusting the injection valve member

56 along the longitudinal axis L optionally the first

Injection ports n 161 or the first and the second

Close injection openings 161, 162. Accordingly, the

Needle 58 by adjusting the injection valve member 56 along the longitudinal axis L optionally the second

Injection ports 162 for a pilot or

Pilot jet injection or the first and the second Open injection openings 161, 162 for a main injection of liquid fuel from the high-pressure chamber 26 into the combustion chamber of the internal combustion engine. In particular, it can

Injection valve member 56 into one shown in FIG

Are brought closed position in which both the first and the second injection openings 161, 162 are closed and the nozzle chamber 17 by sealing

Abutting the valve sealing surface 57 on the injection valve seat 18 is separated from the high-pressure chamber 26.

The nozzle space 17 has an upstream of the

Lower nozzle space 163 arranged upper nozzle space 165 with a larger diameter, which has a conical

Graduation to the lower nozzle space 163 connects. The

The diameter of the upper nozzle space 165 corresponds to the diameter of the second bore section 62 of the injection valve part

15, so that the upper nozzle space 165 with the second

Bore section 62 is aligned.

The needle 58 has an inner bore 582 oriented along the longitudinal axis L, which extends from the lower end 583 of the

Needle 58 goes out. In the side wall, the needle 58

Cross bores 584 which open into the top nozzle space 165 and thus connect the inner bore 582 to the top nozzle space 165 . In the first open position of the

Injection valve member 56, in which the second

Injection ports 162 are open, connecting the inner

Bore 582, the second injection ports 162 on the

Lower nozzle space 163 and the upper nozzle space 165 with the

High pressure chamber 26. In the second open position of

Injection valve member 56, in which the first and second injection ports 161, 162 are open, connects the inner bore 582 the first and the second

Injection openings 161, 162 via the lower nozzle chamber 163 and the upper nozzle chamber 165 with the high-pressure chamber 26.

The nozzle space 17 is designed like a blind hole with a bottom 171, the nozzle space 17 being shown in FIG

Closed position of the injection valve member 56 from the bottom

End 583 of the needle 58 and the bottom 171 limited clearance

166 which is connected to the inner bore 582 . The nozzle chamber 17 has a downstream end

Undercut on which the space 166 in the

Closed position of the injection valve member 56 forms.

Through the intermediate part 66 therethrough runs from the dem

Control room 70 facing flat end to the

Control room 70 remote, also flat end face a circular cylindrical guide recess. In this one is

Shaft 76 of a mushroom-shaped design

Intermediate valve member 78 out. An integrally formed with the stem 76 head 80 of the intermediate valve member 78 is located in the control chamber 70 and acts with its, the

Intermediate part 66 facing side with the intermediate part 66 together, the flat end face has an annular

Intermediate valve seat forms.

The intermediate valve member 78 forms together with the on

Intermediate part 66 formed an intermediate valve seat

Intermediate valve 83. For the design of the intermediate valve 83, reference is made to WO2021/165275 A1 or WO2020/260285 A1, for example, the corresponding disclosures of which are published by

reference shall be deemed incorporated into the present disclosure. The presently described (electro)hydraulic

Control device can also according to others from the state of

Electro-hydraulic control devices known in the art, such as WO2016/041739 A1.

Figure 3 shows a section of another embodiment of a fuel injector 10.2, wherein the lower part of the fuel injector 10.2 from the

Injector seat 18 is shown. In contrast to the in

Figure 2 fuel injector 10.1 shown has the

Sub-nozzle chamber 163 has a first section 163.1 and a second section 163.2 arranged downstream of the first section 163.1 with a compared to the first

Section 163.1 reduced diameter. The second

Section 163.2 follows the first section 163.1 via a conical step. The second injection openings 162 emanate from the second section 163.2 of the sub-nozzle chamber 163 and the first injection openings 161 emanate from the first

Section 163.1 of the lower nozzle space 163. The needle 58 accordingly has a first needle section 58.1, which is located in the first section 163.1 of the lower nozzle space 163 in

Sliding fit is performed. The first needle section 58.1 is followed downstream by a second needle section 58.2, which is located in the second section 163.2 of the lower nozzle space 163 in

Sliding fit is feasible. In figure 3 it is

Injection valve member 56 shown in a closed position in which the first injection ports 161 through the first

Needle section 58.1 and the second injection openings 162 are closed by the second needle section 58.2.

The first and the second needle section 58.1, 58.2 adjoin one another via a conical step. the conical gradation over which the first and the second

Needle section 58.1, 58.2 adjoin one another can, in certain embodiments of the conical gradation, over which the first section 163.1 and the second section

163.2 of the nozzle space 163 connect to one another. As an alternative to the conical gradation, a vertical gradation is also possible between the needle sections 58.1, 58.2 and/or between the first and second sections 163.1, 163.2 of the nozzle chamber 163.

As can be seen in Figure 3, the second

Injection openings 162 each have a first opening section 162.1 emanating from the nozzle chamber 17 or from the second section 163.2 of the lower nozzle chamber 163 and a second opening section adjoining the first opening section 162.1

Opening section 162.2, which in the outer wall of the

Nozzle body 16 and therefore in the combustion chamber

Internal combustion engine opens. The diameter of the second

Opening section 162.2 is larger than the diameter of the first opening section 162.1, so that the second

Injection openings 162 have a profile that widens stepwise in the direction of the combustion chamber of the internal combustion engine. The first opening section 162.1 and the second

Opening sections 162.1 adjoin one another via a conical gradation. But it is also conceivable that the

Connect opening section e 162.1, 162.2 to one another via a vertical gradation. It is also conceivable that the outwardly widening conical gradation whose

Opening angle can be varied, the entire second

Opening section forms. Because of the first

Opening section 162.1 have the second Injection openings 162 have a smaller minimum diameter than the injection openings 161 eerrsstteenn. The second injection openings 162 can therefore be used for pre-injection or pilot injection, while the first injection openings 161 (together with the second injection openings 162, which are also open) can be used for a main injection with liquid fuel.

The nozzle chamber 17 is designed in the manner of a blind hole with a bottom 171 . In the closed position of the injection valve member 56 shown in FIG. In contrast to the one shown in FIG

Fuel injector 10.1 has a curved base 171, so that free space 166 has a hemispherical profile. But it is also possible that the free space

166 is formed as in FIG.

As in fuel injector 10.1 in FIG. 2, needle 58 has an inner bore 582 and transverse bores 584.

FIGS. 4(a)-(c) show three positions of the injection valve member 56 of the embodiment of the fuel injection valve 10.2 shown in FIG. 33.

FIG. 4(a) shows a section of fuel injector 10.2 in the closed position shown in FIG. 3, in which both first injection openings 161 (through first needle section 58.1) and second injection openings 162 (through second needle section 58.2) are closed. Figure 4 (b) shows the fuel injection valve 10.2 with the

Injection valve member 56 in a first open position in which the injection valve member 56 along the

Longitudinal axis L is raised that second

Injection ports 162 are open while the first

Injection ports 161 continue through the first

Needle section 58.2 can be closed. The valve sealing surface

57 is raised from the injector seat 18. In the first open position shown, therefore, fuel from the high-pressure chamber

26 via the second bore section 62 or the

Top nozzle space 165, the inner bore 582 and the

Sub-nozzle space 163 or the second section 163.2 of the

Sub-nozzle chamber 163 reach the second injection openings 162 in order to get from there into the combustion chamber

Internal combustion engine to be injected.

Figure 4 (c) shows the fuel injection valve 10.2 with the

Injection valve member 56 in a second open position in which the injection valve member 56 higher along the

Longitudinal axis L is raised, so that in addition to the second

Injection openings 162 and the first injection openings 161 are open. The needle 58 is still above the first

Needle section 58.1 in the lower nozzle space 163 or in the first

Section 163.1 of the lower nozzle chamber 163 is guided in a sliding fit. The second needle section 58.2, on the other hand, is no longer located in the second section 163.2 of the

Sub-nozzle space 163, but by raising the

Injection valve member 56 in the first section 163.1 of the

Sub-nozzle space 163 and in the conical gradation between the first and second section 163.1, 163.2 of the sub-nozzle space

163 arranged. As can be seen in Figure 4(c), in the shown second open position fuel from the high pressure chamber

26 via the second bore section 62 or the

Upper nozzle space 165, the transverse bores 584, the inner bore

582 and the sub-nozzle space 163 both in the first

Injection ports 161 and in the second

Injection openings 162 reach to be injected from there into the combustion chamber of the internal combustion engine.

By a suitable design of the needle 58, for example with a longer second needle section 58.2, in particular such that the total axial length of the second

Needle section 58.2 and the conical gradation between the first and the second needle section longer than the axial distance between the first and the second injection openings

161, 162, it can be achieved in a further embodiment that the first injection openings 161 are opened first, while the second injection openings 162 are still closed. In such an embodiment, the first injection openings 161 can correspondingly have a smaller minimum diameter than the second

Injection ports 162.

Figure 5 shows a section of another embodiment of a fuel injector 10.3, wherein the lower part of the fuel injector 10.3 from the

Injector seat 18 is shown. The needle 58 des

Fuel injector 10.3 has a sleeve 585, which is made of steel or another suitable material and which is arranged at least partially on the circumference around a lower part of the first needle section 58.1. The sleeve 585 is formed with the

Side wall 164 of the nozzle space 17 or the sub-nozzle space 163 for closing and opening the first injection openings 161 and the second injection openings 162, the sleeve 585 having a radially directed against the side wall 164 of the nozzle space 17 and the sub-nozzle space 163

Clamping force can be applied.

The lower nozzle space 163 also has two undercuts, through which two free spaces 166.1 and 166.2 are formed. First free space 166.1 is similar to free space 166 of fuel injector 10.1 am shown in FIG

Bottom 171 of the nozzle chamber 17 is formed. The second space

166.2 is between the first section 163.1 and the second

Section 163.2 of the lower nozzle space 163 is formed. In the

Fuel injector 10.3 are the second

Injection openings 162 in the first section 163.1 of the

Sub-nozzle space 163 arranged. However, it is also conceivable to arrange the second injection openings in the second section 163.2 and to use the sleeve 585 only to close the first

Injection openings 161 to use. It is also conceivable to attach a second sleeve at least partially on the circumference of a part of the second needle section 58.2, which sleeve can be used to close the second injection openings.

Figure 6 shows a section of another embodiment of a fuel injector 10.4, wherein the lower part of the fuel injector 10.4 from the

Injector seat 18 is shown. At the

Fuel injector 10.4 go first

Injection openings 161 and the second injection openings 162 each via trough-shaped recesses 1611, 1621, preferably with a small volume, from the nozzle chamber 17. The Transitions between the injection ports 161, 162 and the

Side wall 164 of the nozzle space 17 are rounded. In particular, the transitions between the trough-shaped recesses 1611, 1621 and the injection openings 161, 162 are rounded.

Claims

patent claims 1. Fuel injection valve (10.1, 10.2, 10.3, 10.4) for the intermittent injection of fuel into the combustion chamber of an internal combustion engine, comprising a housing (12) defining a longitudinal axis (L) and having a high-pressure fuel inlet (24). Injection valve seat (18) and a nozzle body (16), having a housing (12) arranged high-pressure chamber (26) from the high-pressure fuel inlet (24) to injection valve seat (18), an injection valve member (56) which is adjustable in the housing (12) in the direction of the longitudinal axis (L) and has a valve sealing surface (57), a compression spring (63) which presses the injection valve member (56) with a direction toward the injector seat (18) directed closing force applied, a hydraulic control device (72) for controlling the movement of the injection valve member along the Longitudinal axis (L), wherein the injection valve member (56) one of Valve sealing surface (57) downstream needle (58), which in a downstream of the Injection valve seat (18) arranged nozzle chamber (17) protrudes, wherein the valve sealing surface (57) is formed with the injection valve seat (18) for Connecting the nozzle chamber (17) to and separating the Nozzle chamber (17) from the high-pressure chamber (26) to cooperate sealingly, wherein the nozzle body (16) at least a first dated Nozzle chamber (17) outgoing injection opening (161) and at least a second nozzle chamber (17) outgoing Injection opening (162) for injecting fuel into the combustion chamber of the internal combustion engine, the at least one first injection opening (161) and the at least one second injection opening (162) being at different heights in relation to the longitudinal axis (L) are arranged, wherein the needle (58) is formed with a Side wall (164) of the nozzle chamber (17) for closing and opening the at least one first injection port (161) and/or the at least one second injection opening (162), the fuel injection valve (10.1) further comprising: a guide part (64) in which a control piston (68) of the injection valve member (56) is guided with a sliding fit, an intermediate part (66) which, together with the Guide part (64) and the control piston (68). control room (70) limited, wherein the hydraulic control device (72) is formed by changing the pressure in Control chamber (70) the movement of the injection valve member (56) along the longitudinal axis (L), wherein the hydraulic control device (72) a Intermediate valve (83) with a mushroom-shaped design Intermediate valve member (78) having one in one Guide recess of the intermediate part (66) guided Having a shank (76) and a head (80), and having a side of the intermediate part (66) formed with the head (80) cooperating intermediate valve seat, wherein the Intermediate valve member (78) in an open position Connection between a high-pressure fuel inlet connected to the high-pressure chamber (26) and the control chamber (70) releases and in a closed position Interrupts the connection between the high-pressure fuel inlet and the control chamber (70) and the control chamber (70) from a valve chamber (44) to one Throttle passage - separates, an electrically operable actuator assembly (38) for Connecting the valve chamber (44) to and separating the valve chamber (44) from a low-pressure fuel return (46). 2. Fuel injection valve (10.1-10.4) according to claim 1, characterized in that the at least one first Injection opening (161) and the at least one second Injection opening (162) different have a minimum diameter. 3. Fuel injection valve (10.1-10.4) according to Claim 2, characterized in that the at least one second injection opening (162) is arranged downstream of the at least one first injection opening (161) and has a smaller minimum diameter than the minimum diameter of the at least one first injection opening (161) having. 4. Fuel injection valve (10.1-10.4) according to one of the preceding claims, characterized in that the needle (58) is designed so that, in a closed position of the injection valve member (56), the at least one first injection opening (161) and the at least one second injection opening (162 ) to close, in a first open position of the injection valve member (56) to open the at least one second injection port (162) and the at least one first injection port (161) to close, in a second open position of the injection valve member (56) to open the at least one second injection opening (162) and the at least one first injection opening (161). 5. Fuel injection valve (10.1-10.4) according to claim 4, characterized in that the needle (58) has an inner bore (582) oriented essentially along the longitudinal axis (L) which extends from a lower end (583) of the needle ( 58) emanates and is formed, in the first open position of the injection valve member (56). at least one second injection port (162) with the To connect high pressure chamber (26), and in the second Open position of the injection valve member (56), the at least one second injection opening (162) and the at least one first injection opening (161) with the To connect high-pressure chamber (26). 6. Fuel injection valve (10.1-10.4) according to claim 5, characterized in that the nozzle chamber (17) is arranged downstream of the high-pressure chamber (26). Top nozzle space (165) and one downstream of the Upper nozzle space (165) arranged lower nozzle space (163), wherein the lower nozzle space (163) on the inner Bore (582) of the needle (58) is connected to the upper nozzle space (165), the at least one first Injection opening (161) and the at least one second Injection opening (162) emanate from the lower nozzle space (163). 7. Fuel injection valve (10.1-10.4) according to claim 6, characterized in that the inner bore (582) of the needle (58) via at least one transverse bore (584) in a side wall (581) of the needle with the upper nozzle space (165) is connected. 8. Fuel injection valve (10.1-10.4) according to Claim 6 or 7, characterized in that the needle (58) in Sliding fit in the lower nozzle space (163) is performed. 9. Fuel injection valve (10.1-10.4) according to one of Claims 6 to 8, characterized in that the Diameter of the nozzle chamber (17) at the transition from The upper nozzle space (165) is reduced to the lower nozzle space (163), preferably via a conical gradation. 10. Fuel injection valve (10.2, 10.3) according to one of Claims 6 to 9, characterized in that the Sub-nozzle chamber (163) has a first section (163.1) and a second section (163.2) arranged downstream of the first section (163.1) with an im Decreased compared to the first section (163.1). has diameter. 11. Fuel injection valve (10.2) according to claim 10, characterized in that the at least one second injection opening (162) from the second section (163.2) of Sub-nozzle space (163) goes out. 12. Fuel injection valve (10.2, 10.3) according to claim 10 or 11, characterized in that the at least one first injection opening (161) from the first section (163.1) of the lower nozzle space (163). 13. Fuel injection valve (10.2, 10.3) according to one of Claims 9 to 12, characterized in that the Needle (58) has a first needle section (58.1), which in the first section (163.1) of the lower nozzle space (163) is guided in sliding fit and one on the first Needle section (58.1) subsequent second Having needle section (58.2), which in the second Section (163.2) of the lower nozzle space (163) in Sliding fit is feasible. 14. Fuel injection valve (10.2, 10.3) according to claim 13, characterized in that the second needle section (58.2) between the closed position and the first Open position of the injection valve member (56) in the second Section (163.2) of the lower nozzle space (163) in Sliding fit is performed. 15. Fuel injection valve (10.2, 10.3) according to claim 13 or 14, characterized in that the first and the second needle section (58.1, 58.2) via a conical Connect gradation to each other. 16. Fuel injection valve (10.1-10.4) according to any one of the preceding claims 4 to 15, characterized in that the nozzle chamber (17) is formed like a blind hole with a bottom (171), wherein the Nozzle chamber (17) in the closed position of the Injector valve member (56) from a lower end (583) of the needle (58) and the bottom (171) of the blind hole-like nozzle chamber (17) limited free space (166, 166.1). 17. Fuel injection valve (10.1, 10.3, 10.4) according to one of the preceding claims, characterized in that the nozzle chamber (17) has an undercut at a downstream end. 18. Fuel injection valve (10.1-10.4) according to any one of the preceding claims, characterized in that the injection valve seat (18) in a Injection valve part (15) is formed, wherein the Nozzle body (16) is releasably attached to the injection valve part (15), preferably via a union nut (23). 19. Fuel injection valve (10.3) according to one of the preceding claims, characterized in that the needle (58) has a sleeve (585) which is formed with the side wall (164) of the nozzle chamber (17) to cooperate to close and open the at least one first injection opening (161) and/or the at least one second injection opening (162). 20. Fuel injection valve (10.3) according to claim 19, characterized in that the sleeve (585) is acted upon by a clamping force directed radially against the side wall (164) of the nozzle chamber (17). 21. Fuel injection valve (10.2) according to one of the preceding claims, characterized in that the at least one second injection opening (162) has a nozzle chamber (17) emanating from the first opening section (162.1) and one on the first opening section (162.1) adjoining second opening section (162.2), wherein the diameter of the second Opening section (162.2) is larger than the diameter of the first opening section (162.1). 22. Fuel injection valve (10.4) according to one of the preceding claims, characterized in that the at least one first injection opening (161) and/or the at least one second injection opening (162) emanate from the nozzle chamber (17) via a trough-shaped recess (1611, 1621). 23. Fuel injection valve (10.1) according to any one of the preceding claims, characterized in that the intermediate valve member (78) in the open position releases the second connection between the high-pressure fuel inlet and the valve chamber (44) and in which Closing position, the second connection between the High-pressure fuel admission and the valve chamber (44) interrupts.