Injector for an internal combustion engine

Abstract

The invention relates to an injector (1) for an internal combustion engine, the injector comprising an injector housing (2) and an injector needle (3) which is received in the injector housing (2) so as to be movable in translation along an opening axis (5) of a receiving opening (4) formed in the injector housing (2), the injector needle serving to close or open a nozzle (6) of the injector (1), and wherein the injector needle (3) is designed such that it can perform a stroke movement in the receiving opening (4) with the aid of a movement device (11), and wherein the injector housing (2) has a fuel chamber (14) which can be filled with fuel (K) to be injected into the internal combustion engine via the nozzle (6), and in which a fuel pressure (pKr) prevails during operation of the injector (1). According to the invention, in order to prevent leakage of the fuel (K) into the surroundings of the fuel chamber (14), the fuel chamber (14) is fluidically connected to an overflow chamber (22) which can be filled with a chamber medium (KM), wherein a chamber pressure (pK), which is lower than the fuel pressure (pKr), prevails in the overflow chamber (22) during operation of the injector (1), and wherein the overflow chamber (22) is designed such that the leakage can be discharged from the injector (1).

Description

[0001] Woodward L'Orange GmbH February 6, 2026 F&R Ref.: 46715-0181WO1

[0002] Fuel injector for an internal combustion engine

[0003] The invention relates to an injection injector for an internal combustion engine of the type specified in the preamble of claim 1.

[0004] Fuel injectors for internal combustion engines are a well-known technology. They inject fuel into the combustion chamber or intake manifold of an internal combustion engine. The injector is designed to achieve thorough atomization of the fuel, ensuring complete combustion. To prevent fuel from escaping into the environment, known as leakage, overflow or transfer chambers are incorporated to contain any leakage. Leakage prevention is particularly important when using alternative fuels such as methanol or ammonia.

[0005] Thus, from the patent applications WO 03 / 004865 A1 and WO 02 / 064969 A1, an injection injector for an internal combustion engine can be seen, which has a first fuel-filled chamber and a second fuel-filled chamber, wherein the pressure in the first fuel-filled chamber is higher than in the second fuel-filled chamber, wherein the second fuel-filled chamber is designed in the form of a transfer chamber.

[0006] German patent application DE 102008032 133 A1 discloses an injection injector for an internal combustion engine, wherein the injection injector has a high-pressure chamber and a low-pressure chamber. A guide sleeve element is arranged between the low-pressure chamber and the high-pressure chamber, which, together with an injector needle, forms the high-pressure chamber and the low-pressure chamber. Depending on a pressure, in particular the pressure in the high-pressure chamber, the guide element can serve as a seal between the high-pressure chamber and the low-pressure chamber. The object of the present invention is to provide an improved injection injector for an internal combustion engine.

[0007] This problem is solved according to the invention with an injection injector for an internal combustion engine having the features of claim 1. Advantageous embodiments with expedient and non-trivial further developments of the invention are specified in the dependent claims.

[0008] An injection injector according to the invention for an internal combustion engine comprises an injector housing and an injector needle that is movably mounted translationally in the injector housing along an opening axis of a receiving opening formed in the injector housing. The injector needle serves to close or open a nozzle of the injection injector. The injector needle is mounted in the receiving opening so that it can perform a stroke movement by means of a movement device of the injection injector. Or, in other words, the injector needle is designed or arranged so that it can perform a stroke movement in the receiving opening by means of the movement device. The injector housing has a fuel chamber which can be filled with fuel to be injected into the internal combustion engine via the nozzle, and in which fuel pressure prevails when the injection injector is in operation (or during the intended use of the injection injector).According to the invention, to prevent fuel leakage into the environment (the fuel chamber), the fuel chamber is fluidically connected to a transfer chamber, which can be filled with a chamber medium. When the injection injector is in operation, the pressure in the transfer chamber is lower than the fuel pressure, and the transfer chamber is designed such that the leakage can be discharged from the injection injector or flow out of the injection injector. In other words, the leakage can also flow from the transfer chamber to the outside of the injection injector. The advantage of the injection injector according to the invention is that a pressure difference between the fuel pressure and the chamber pressure in the transfer chamber forces the leakage to flow into the transfer chamber.The transfer chamber itself is designed to allow leakage fluid to flow into the fuel reservoir, from where it can be pumped back into the fuel chamber. For this to occur, the pressure in the transfer chamber could be at least higher than the ambient pressure. Alternatively, if the fuel reservoir has a pressure higher than the ambient pressure, it would be advantageous for the chamber pressure to be at least higher than the reservoir pressure to ensure that leakage fluid flows into the fuel reservoir.

[0009] Preventing leakage from the injection injector is particularly relevant for fuels such as methanol or ammonia, which are currently used especially in large internal combustion engines, for example in ships or stationary power plants.

[0010] The transfer chamber is advantageously connected to the receiving opening in which the injector needle is located, with the transfer chamber being configured along the opening axis opposite the nozzle opening of the injector. In other words, along the opening axis of the injector needle, the transfer chamber is located on the opposite side of the fuel chamber from the nozzle opening of the injector. This allows for a simple flow of leakage from the fuel chamber into the transfer chamber.

[0011] If elements of the injection injector are described as being connected in a way that allows fluid to flow through them, this means that they are fluidically connected. In other words, the elements are connected in such a way that fluids can flow between them.

[0012] Advantageously, the transfer chamber is connected to a fuel reservoir in a way that allows flow through it, thus diverting leakage from the injector and enabling the leakage to easily flow into the fuel reservoir. The chamber medium can have at least partially the same composition as the fuel, or it can have a completely different composition. In other words, the injector uses the same medium, specifically the same fluid, in the transfer chamber and the fuel chamber, so that, for example, the fuel and the chamber medium can be drawn from a single tank, in this case the fuel reservoir. However, the chamber medium could also have a different composition than the fuel.

[0013] The overflow chamber of the injection injector according to the invention could be connected to a sealing chamber, which can be filled with a sealing medium, allowing flow through it. This offers the advantage that the flow of leakage into the overflow chamber can be supported by the sealing chamber, for example, if the pressure in the sealing chamber, a sealing chamber pressure, is greater than the chamber pressure and preferably less than the fuel pressure. The pressure difference between the chamber pressure and the sealing chamber pressure can prevent leakage from flowing into the sealing chamber.

[0014] The sealing chamber can be configured along the opening axis opposite the overflow chamber of the nozzle opening. In other words, along the opening axis of the injector needle, the sealing chamber is located on the opposite side of the overflow chamber than the nozzle opening. This allows for the cost-effective realization of the pressure differential between the sealing chamber and the overflow chamber, particularly if the overflow chamber is connected to the sealing chamber via a flow gap formed between the receiving orifice and the injector needle.

[0015] The sealing medium may have at least partially the same composition as the fuel and / or the chamber medium, or a composition that differs completely from the fuel and / or the chamber medium.

[0016] If the movement device is hydraulically designed, the injection injector according to the invention has a first control chamber of the movement device along the opening axis opposite the nozzle opening of the nozzle, at least with respect to the overflow chamber, which can be filled with a control medium. In other words, along the opening axis of the injector needle, the first control chamber is located on the opposite side of the overflow chamber from the nozzle opening of the nozzle. The stroke movement of the injector needle could be realized with the aid of this first control chamber, whereby a first control chamber pressure, which develops in the first control chamber during operation of the injection injector, acts on the injector needle.Furthermore, the first control chamber can assume the function of the sealing chamber if it is connected to the transfer chamber via a flow-through connection, for example, by forming a movement gap between the first control chamber and the transfer chamber. For this purpose, the first control chamber, during operation of the injection injector, exhibits a pressure that is at least greater than the chamber pressure. This means that, depending on the pressure of the first control chamber, a separate sealing chamber is not necessary, as the first control chamber can already fulfill its function.

[0017] Advantageously, the movement device includes a control unit so that the first control chamber pressure can be regulated with the help of the control unit.

[0018] The movement device can have, in addition to the first control chamber, a second control chamber which encompasses the receiving opening, wherein a piston is formed between the first control chamber and the second control chamber which is firmly connected to the injector needle, and wherein, depending on the first control chamber pressure and a second control chamber pressure prevailing in the second control chamber during operation of the injection injector, the injector needle can be arranged or moved to open or close the nozzle.

[0019] Particularly if the fuel differs at least partially or completely from the chamber medium and / or the sealing medium and / or the control medium, it is advantageous to fluidically connect a separation device to the overflow chamber to separate the fuel from the leakage, since the leakage, which is routed through the overflow chamber, may contain components of the chamber medium and / or the sealing medium and / or the control medium in addition to the fuel. The separation device can advantageously be arranged between the fuel reservoir and the overflow chamber.

[0020] Further advantages, features, and details of the invention will become apparent from the following description of preferred embodiments and from the drawings. The features and combinations of features mentioned above in the description, as well as those mentioned below in the figure description and / or shown in the figures alone, can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention. Identical or functionally equivalent elements are assigned identical reference numerals. The figures show:

[0021] Fig. 1 shows a schematic representation of an injection injector for an internal combustion engine according to the prior art.

[0022] Fig. 2 shows an isometric view of a section of an injector housing of the injection injector similar to Fig. 1.

[0023] Fig. 3 shows a schematic representation of an injection injector according to the invention for an internal combustion engine according to a first embodiment,

[0024] Fig. 4 shows a section of the injection injector according to the invention in the first embodiment,

[0025] Fig. 5 shows a schematic representation of the injection injector according to the invention in a second embodiment,

[0026] Fig. 6 shows an isometric view of a partial section of the injection injector according to the second embodiment, and Fig. 7 shows a section of the injection injector according to the second embodiment.

[0027] Figure 1 illustrates an injection injector 1 for an internal combustion engine (not shown in detail) according to the prior art. The injection injector 1 has an injector housing 2, which is illustrated in a perspective view in Figure 2 and which is advantageously designed in multiple parts, particularly for improved manufacturing and assembly of the injection injector 1. An injector needle 3 is movably mounted in a receiving opening 4 within the injector housing 2. The movement of the injector needle 3 is a translational movement, a so-called stroke, along an opening axis 5 of the receiving opening 4.

[0028] The injector needle 3, with the aid of its needle tip 7, serves to close or open a nozzle 6 of the injection injector 1, which is formed in the injector housing 2 at one end 8 of the injector housing 2. In the present embodiment, the nozzle 6 has several nozzle openings 9, which are arranged in an annular pattern. The nozzle 6 could also have a single nozzle opening 9, or the nozzle openings 9 could be configured in another way, for example, offset from each other in the axial direction along the opening axis 5.

[0029] The injector needle 3 is subjected to pressure, in particular at its needle end 10, which is positioned away from the needle tip 7. A movement device 11 for bringing about the stroke movement of the injector needle 3 is hydraulically designed, but it could also be mechanically designed, for example with the aid of a cam which is arranged on a camshaft and initiates the stroke movement of the injector needle 3 when the camshaft rotates.

[0030] The movement of the injector needle 3 can be controlled by means of a control unit 12 of the motion device 11, which in the present embodiment is designed in the form of a valve, in particular in the form of a three-way valve. The valve could also have a different form, for example, it could be designed in the form of a two-way valve.

[0031] In both embodiments described here, the injection injector 1 is essentially hydraulically actuated. A spring element 13, which exerts a preload on the injector needle 3, ensures the reliable closure of the nozzle 6. However, the injection injector 1 could also consist solely of the spring element 13 to effect the stroke movement.

[0032] The receiving opening 4 is generally designed in the shape of a cylinder, with different diameters D in certain sections. Naturally, the receiving opening 4 could also have a shape other than a cylinder; however, the cylindrical shape results in a cost-effective manufacturing process for the injection injector 1.

[0033] The injector housing 2 has a fuel chamber 14 in the area of ​​the nozzle 6, which is filled with fuel K that is injected into the internal combustion engine to operate it. The fuel chamber 14 encompasses the receiving opening 4 and is connected to it in a section 15 of the receiving opening 4 adjacent to the nozzle 6, allowing fuel to flow through it.

[0034] Fuel flows from a fuel reservoir 28, a tank, into the fuel chamber 14 via fuel lines 16. These fuel lines 16 and the fuel chamber 14 are preferably visible in Fig. 2, which illustrates a section of the injector housing 2 of the injection injector 1 in an isometric view. The fuel lines 16—in the present embodiment, two fuel lines 16 are provided, but more fuel lines 16 could also be provided, or only one fuel line 16 could be provided—are arranged symmetrically with respect to the opening axis 5. Preferably, a fuel pressure pKr of at least approximately 600 bar is maintained in the fuel chamber 14 for the injection of the fuel K. Naturally, the fuel pressure p^ could also be higher or lower. This depends, among other things, on the

[0035] Internal combustion engine. Between the fuel chamber 14 and the needle end 10, the injector needle 3 has a piston 17, which is rigidly connected to it. The piston 17 is arranged between a first control chamber 18 of the motion device 11 and a second control chamber 19 of the motion device 11, the two control chambers 18 and 19 encompassing the receiving opening 4. In the first control chamber 18, a first control chamber pressure PKKI, generated by means of a control medium KM, is present, and in the second control chamber 19, a second control chamber pressure PKK2, generated by means of the control medium KM, is present, the pressures PKKI and PKK2 being controllable by means of the control unit 12.

[0036] The first control chamber 18 has a control medium inlet 20, while the second control chamber 19 has a control medium outlet 21, through which the control medium KM can flow according to the positioning of the control unit 12. The control unit 12 is arranged between the control medium inlet 20 and the control medium outlet 21, so that the pressures PKKI and PKK2 can be controlled depending on the positioning of the control unit 12. If the pressure PKKI is greater than the pressure PKK2, the piston 17, and thus the injector needle 3, moves in the direction away from the nozzle 6, thereby opening the nozzle openings 9. If, on the other hand, the pressure PKKI is less than the pressure PKK2, the piston 17 moves towards the nozzle 6, thereby closing the nozzle openings 9. The stroke movement of the injector needle 3 can thus be initiated by means of the motion device 11.

[0037] To prevent leakage, the fuel chamber 14 is connected to a transfer chamber 22, in which a chamber medium MK is arranged, allowing flow through it. The flow-through connection between the fuel chamber 14 and the transfer chamber 22 along the injector needle 3 is realized in a movement gap 30 formed between the injector needle 3 and the receiving opening 4.

[0038] The overflow chamber 22 is designed such that it has a chamber pressure PK which is lower than the fuel pressure pKr in the fuel chamber 14. The chamber pressure PK is higher than the ambient pressure. For example, the chamber pressure PK is 100 bar. The overflow chamber 22 is designed to allow leakage from the injector housing 2 to flow out. Thus, any potential leakage flows from the fuel chamber 14 into the overflow chamber 22 and can then flow out of the injector housing 2. In the present embodiment, the overflow chamber 22 is connected to the fuel reservoir 28 so that, in the event of a leak, it is returned to the fuel reservoir 28.

[0039] The transfer chamber 22 is arranged along the opening axis 5 between the fuel chamber 14 and the first control chamber 18, and is connected to the receiving opening 4 in a way that allows flow through it. Or, in other words, the transfer chamber 22 is connected to the receiving opening 4 in a way that allows flow through it, and the transfer chamber 22 is configured along the opening axis 5 opposite the nozzle openings 9 with respect to the fuel chamber 14.

[0040] The transfer chamber 22 contains the chamber medium MK, which can have the same composition as the fuel K. However, it can also have only a partially similar composition to the fuel, or it can have a completely different composition. In the present embodiment, the transfer chamber 22 has a chamber inlet 23 and a chamber outlet 24.

[0041] Figure 4 shows a cross-sectional view of the injection injector 1 according to the first embodiment of the invention. The injector housing 2 is shown here as an example of a two-part design, with the fuel chamber 14 and the overflow chamber 22 arranged in a first housing section 25 of the injector housing 2. The two control chambers 18, 19 of the movement device 11 are advantageously formed in a second housing section 26 of the injector housing 2.

[0042] It should be mentioned here that the injection injector 1 is specifically designed for injecting fuel K, which can also be referred to as a medium, in the form of ammonia or ethanol into the internal combustion engine. However, any other fuel, including water, could also be injected into the internal combustion engine using the injection injector 1 according to the invention.

[0043] Figures 5 to 7 illustrate the injection injector 1 according to the invention in a second embodiment. In this second embodiment, the overflow chamber 22 is connected to a sealing chamber 27 in a flow-through manner, the sealing chamber 27 being configured along the opening axis 5 opposite the nozzle openings 9 with respect to the overflow chamber 22. In this embodiment, the sealing chamber 27 is connected to the receiving opening 4 in a flow-through manner.

[0044] The sealing chamber 27, which is filled with a sealing medium DM, is designed to generate a sealing chamber pressure PKD in the sealing chamber 27, wherein the sealing chamber pressure PKD is greater than the chamber pressure PK. In other words, the sealing chamber pressure PKD in the sealing chamber 27 is greater than the chamber pressure PK in the overflow chamber 22. This prevents the leakage from the fuel chamber 14 from flowing through the overflow chamber 22 into the sealing chamber 27.

[0045] The sealing medium DM can have the same or at least partially the same composition as the fuel K and / or the chamber medium KM, but it can also have a completely different composition. This means that the injector 1 can contain the same medium in the fuel chamber 14, the transfer chamber 22, and the sealing chamber 27, or that it contains media in these chambers 14, 22, and 27 that are different or at least partially different from each other. This means that the injector 1 can be filled with four different media, but it could also be filled with only a single medium, the fuel K, provided that the control medium KM also has the same composition as the fuel K.

[0046] In Figures 1, 3, 4, 5, and 7, the flow paths for the fuel F, the chamber medium MK, the sealing medium DM, and the control medium KM are shown, in principle, with the aid of flow direction arrows for the media F, MK, DM, and KM. It should be noted here that the flow paths between the fuel chamber 14 and the receiving opening 4, the transfer chamber 22 and the receiving opening 4, and the sealing chamber 27 and the receiving opening 4 are advantageously formed as an integral structure of the chambers 14, 22, 27, and the receiving opening 4. In other words, the receiving opening 4 has different diameters D to accommodate the different chambers 14, 22, and 27. For example, it has a first diameter D1 to receive the injector needle 3, which includes the movement gap 30.To create the fuel chamber 14, the receiving opening 4 has a second diameter D2, which is larger than the first diameter D1. Furthermore, to create the transfer chamber 22 and the sealing chamber 27, it has a third diameter D3 and a fourth diameter D4, respectively, which are also larger than the first diameter D1. The receiving opening 4 also has diameters D larger than the first diameter D1 to create the control chambers 18 and 19, as well as to accommodate the piston 17. In other words, the receiving opening 4 has diameters D that differ from each other in sections. Or, put another way, the receiving opening 4 has a variable diameter D along its length on the opening axis 5.This has the advantage that the various chambers 14, 18, 19, 22, 27 can be manufactured simply, especially if the injector housing 2 has a housing section manufactured independently of the other housing sections, associated with fuel chamber 14, the transfer chamber 22, the sealing chamber 27, and the control chambers 18, 19. A further advantage is that the diameter D associated with each chamber 14, 22, 27, 18, 19 can be designed such that the desired pressure in that chamber 14, 22, 27, 18, 19 can be achieved by means of the diameter.

[0047] The injection injector 1 according to the second embodiment has a separating device 29 for separating the fuel K from the sealing medium DM and / or the chamber medium KM, which is connected to the injector housing 2 in a flow-through manner. The separating device 29 is preferably formed between the fuel reservoir 28 and the outlet opening 24 of the overflow chamber 22. This can be used if the sealing medium DM and / or the chamber medium KM differ in composition from the fuel K and a mixture of fuel K and the sealing medium DM and / or the chamber medium KM has flowed into the overflow chamber 12.

[0048] It should be noted that the fuel F, the sealing medium DM, the chamber medium MK, and the control medium could be in the form of a suitable fluid, i.e., liquid or gaseous. They could also be in the form of so-called renewable fluids or fossil gases. Reference list

[0049] 1 fuel injector

[0050] 2 injector housings

[0051] 3 injector needles

[0052] 4 Intake opening

[0053] 5 Opening axis

[0054] 6 nozzle

[0055] 7 needle point

[0056] 8 End

[0057] 9 nozzle opening

[0058] 10 needle ends

[0059] 11 Motion device 12 Control unit

[0060] 13 Spring element

[0061] 14 Fuel chamber

[0062] Section 15

[0063] 16 Fuel line

[0064] 17 pistons

[0065] 18 First control chamber 19 Second control chamber 20 Control medium inlet 21 Control medium outlet 22 Overflow chamber

[0066] 23 Chamber entry

[0067] 24. Chamber exit

[0068] 25 First housing section 26 Second housing section 27 Sealing chamber

[0069] 28 Fuel reservoir

[0070] 29 Separating device

[0071] 30 Movement gap D diameter

[0072] DM sealing medium

[0073] D1 First Diameter

[0074] D2 Second Diameter

[0075] D3 Third Diameter

[0076] D4 Fourth Diameter

[0077] K fuel

[0078] KM control medium

[0079] MK Chamber Medium

[0080] PK chamber pressure

[0081] PKr fuel pressure

[0082] PCD sealing chamber pressure

[0083] PKKI First Control Chamber Pressure PKK2 Second Control Chamber Pressure

Claims

Woodward L'Orange GmbH February 6, 2026 F&R Ref.: 46715-0181WO1 Patent claims 1. Injection injector (1) for an internal combustion engine, comprising an injector housing (2) and an injector needle (3) movably mounted in the injector housing (2) along an opening axis (5) of a receiving opening (4) formed in the injector housing (2), which serves to close or open a nozzle (6) of the injection injector (1), and wherein the injector needle (3) is designed to perform a stroke movement in the receiving opening (4) by means of a movement device (11), and wherein the injector housing (2) has a fuel chamber (14) which can be filled with fuel (K) to be injected into the internal combustion engine via the nozzle (6), and in which a fuel pressure (pKr) prevails during operation of the injection injector (1). characterized by the fact that To prevent fuel (K) from leaking into the environment of the fuel chamber (14), the fuel chamber (14) is fluidically connected to a transfer chamber (22) which can be filled with a chamber medium (KM), wherein a chamber pressure (PK) prevails in the transfer chamber (22) during operation of the injection injector (1) which is less than the fuel pressure (pKr), and wherein the transfer chamber (22) is designed in such a way that the leakage from the injection injector (1) can be discharged.

2. Injection injector (1) according to claim 1 , characterized by the fact that The overflow chamber (22) is fluidically connected to the receiving opening (4), wherein the overflow chamber (22) is configured along the opening axis (5) opposite to the fuel chamber (14) of a nozzle opening (9) of the nozzle (6).

3. Injection injector (1) according to claim 1 or 2, characterized by the fact that the overflow chamber (22) for draining the leakage from the injection injector (1) is fluidically connected to a fuel reservoir (28).

4. Injection injector (1) according to one of the preceding claims, characterized by the fact that the chamber medium (CM) - has at least partially the same composition as the fuel (K), or - has a composition that is completely different from that of the fuel (K).

5. Injection injector (1) according to any one of the preceding claims, characterized by the fact that the overflow chamber (22) is fluidically connected to a sealing chamber (27) which can be filled with a sealing medium (DM).

6. Injection injector (1) according to claim 5, characterized by the fact that the sealing chamber (27) is designed in the opposite direction to the overflow chamber (22) of the nozzle opening (9) of the nozzle (6) along the opening axis (5).

7. Injection injector (1) according to claim 5 or 6, characterized by the fact that The overflow chamber (22) is fluidically connected to the sealing chamber (27) via a movement gap (30) formed between the receiving opening (4) and the injector needle (3).

8. Injection injector (1) according to one of claims 5 to 7, characterized by the fact that the sealing chamber (27) is fluidically connected to the receiving opening (4).

9. Injection injector (1) according to one of claims 5 to 8, characterized by the fact that During operation of the injection injector (1) a sealing chamber pressure (PKD) prevails in the sealing chamber, wherein the sealing chamber pressure (PKD) is greater than the chamber pressure (PK).

10. Injection injector (1) according to any one of claims 5 to 9, characterized by the fact that the sealing medium (DM) - has at least partially the same composition as the fuel and / or the chamber medium, or - has a composition that differs completely from the fuel and / or the chamber medium.

11. Injection injector (1) according to one of the preceding claims, characterized by the fact that - provided that the movement device (11) is hydraulically designed - along the opening axis (5) opposite to the nozzle opening (9) of the nozzle (6) at least with respect to the overflow chamber (22) a first control chamber (18) of the movement device (11) is formed which can be filled with a control medium (CM).

12. Injection injector (1) according to claim 11 , characterized by the fact that During operation of the injection injector (1), a first control chamber pressure (PKKI) prevails in the first control chamber (18), which is at least greater than the chamber pressure (PK).

13. Injection injector (1) according to claim 11 or 12, characterized by the fact that The first control chamber pressure (PCC) can be controlled by means of a control unit (12) of the movement device (11).

14. Injection injector according to one of claims 11 to 13, characterized by the fact that the first control chamber (18) and a second control chamber (19) of the movement device (11) are designed to encompass the receiving opening (4), wherein a piston (17) is formed between the first control chamber (18) and the second control chamber (19), which is firmly connected to the injector needle (3), and wherein, depending on the first control chamber pressure (PKKI) and a second control chamber pressure (PKK2) prevailing in the second control chamber (19) during operation of the injection injector (1), the injector needle (3) can be arranged to open or close the nozzle (6).

15. Injection injector (1) according to any one of the preceding claims, characterized by the fact that a separation device (29) for separating the fuel (K) from the chamber medium (KM) is fluidically connected to the overflow chamber (22).

16. Injection injector (1) according to any one of the preceding claims, characterized by the fact that the fuel (K) is methanol or ammonia.

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