Gas injector for an internal combustion engine

Abstract

The invention relates to a gas injector for an internal combustion engine, comprising a housing (1) and an injector valve needle (3) slidably arranged therein along its longitudinal axis (2) for introducing and metering a gas flow into the combustion chamber of the internal combustion engine, and an electrically energized electromagnet with a slidably arranged magnetic armature (5) for adjusting the injector valve needle (3), characterized in that the magnetic armature (5) can be decoupled from the injector valve needle (3) in an unenergized state and returned to a deactivated position from an activated position in actuating contact with the injector valve needle (3), and at a sealing point (21) the gas flow through the magnetic armature (5) can be gas-tightly shut off in sealing contact with at least one sealing element (22), wherein the magnetic armature (5) is connected to a hollow body (30) arranged coaxially and fixedly in the housing (8) in the gas flow, which is gas-tight and axially elastic.

Description

[0001] The invention relates to a gas injector for an internal combustion engine of the type defined in more detail in the preamble of claim 1.

[0002] From DE 10 2019 205 301 A1, a valve for metering a fluid, in particular a fuel injection valve for internal combustion engines, is known. It comprises a housing and an armature of an actuator arranged in an armature chamber of the housing and a valve needle that can be actuated by the armature along a longitudinal axis against a return spring.

[0003] Further injectors are known from DE 10 2021 206 186 A1 and DE 10 2021 213 023 A1.

[0004] The invention is therefore based on the objective of proposing a gas injector of the aforementioned type in which gas leakage in the switched-off state of the internal combustion engine is avoided or reduced to an acceptable level in a structurally simple manner.

[0005] The problem is solved by the features of claim 1. Further advantageous and claimed embodiments are described in the respective dependent claims, the description, and the drawings.

[0006] Thus, a gas injector for an internal combustion engine is proposed, comprising a housing and an injector valve needle slidably arranged within it along its longitudinal axis for introducing and metering the gas flow into the combustion chamber of the internal combustion engine. An electrically energized electromagnet with a slidably arranged magnetic armature is provided for adjusting the injector valve needle within the housing. To prevent or reduce gas leakage to an acceptable level in a structurally simple manner when the internal combustion engine is switched off, the magnetic armature is designed to be slidably reset from an activated position in contact with the injector valve needle to an deactivated position when de-energized, and at a sealing point, the gas flow through the magnetic armature can be gas-tightly shut off in close contact with at least one sealing element.The magnetic armature is connected to a hollow body arranged coaxially and fixedly within the housing in the gas flow, which is gas-tight and axially elastic.

[0007] Therefore, at the sealing point, located away from the combustion chamber in the low operating temperature range, the gas flow can be reliably sealed easily with at least one highly sealing element, preferably made of plastic. This avoids the need for a complex and expensive metal-to-metal seal in the high-temperature range.

[0008] Since the magnetic armature can be decoupled from the injector valve needle in the unenergized state and reset to the deactivated position with a small axial distance to the injector valve needle, axial component tolerances between the injector valve needle and the magnetic armature, especially at the needle seat and at the sealing point, can be easily compensated.

[0009] This allows the injector valve needle to be manufactured with lower precision and also with lower mass. The lower mass reduces the inertia of the injector valve needle and the forces generated by impact with the needle seat, thus enabling the use of materials with lower strength. Alternatively, it is also possible to increase the permissible impact velocity of the injector valve needle.

[0010] In addition, the magnetic armature can be accelerated from the deactivated position in front of the actuating contact with the injector valve needle, thereby reducing the adjustment time of the injector valve needle.

[0011] The connection of the magnetic armature to the hollow body allows a static force resulting from the gas pressure in the gas flow to act on the magnetic armature in the direction of its movement into the deactivated position, thus closing and shutting off the gas flow. Since this force increases with the gas pressure in the gas inlet area, the sealing effect at the sealing seat is strengthened with increasing gas pressure. In this way, a tight seal at the sealing point can be guaranteed even at very high gas pressures, especially in the event of malfunctions.

[0012] In a preferred embodiment of the invention, the magnetic armature for the actuating contact with the injector valve needle can be directly coupled to it. This eliminates the need for additional components that transmit the actuating movement. Furthermore, the axial installation space can be reduced.

[0013] In a further preferred embodiment of the invention, the hydraulically effective diameter of the hollow body is equal to or greater than the contact diameter of the sealing contact between the sealing element and the contact surface formed on the sealing partner of the magnetic armature. This ensures, in a simple manner, that the prevailing gas pressure always exerts a closing force on the magnetic armature to shut off the gas flow. Increasing the outer diameter of the hollow body can further increase this closing force.

[0014] In addition, the return of the magnetic armature to the deactivated position is made easier; in particular, the return spring means can be designed with reduced spring force.

[0015] The hydraulically effective diameter is understood to be, in particular, the diameter of the hollow body that is effective from a fluid mechanics perspective with regard to pressure loss and gas flow rate. For a circular flow cross-section, i.e., a circular cross-sectional shape of the hollow body, the outer diameter can be used as the hydraulically effective diameter. For a flow cross-section that deviates from a circular shape, the approximately determined, fictitious, fluid-mechanically effective diameter of the hollow body can be used as the hydraulically effective diameter.

[0016] A particularly simple and preferred embodiment of the hollow body can be achieved by means of a metal bellows designed to be elastic in the axial direction.

[0017] The preferred material for the sealing element is plastic, which allows for a particularly high level of sealing even with lower manufacturing precision. It is also advantageous to use an elastic material for the sealing element, so that manufacturing inaccuracies in the connected components can be compensated for at the sealing element. Sealing elements made of elastomers are particularly suitable for this purpose, although other suitable materials can also be used.

[0018] In a further preferred embodiment of the invention, the magnetic armature and the housing each form a sealing seat at the sealing point for an annular sealing contact with at least one sealing element. The annular sealing contact enables a high sealing effect.

[0019] A further development of the invention provides that the sealing element is designed as a sealing ring, which is easy to install and inexpensive to manufacture and ensures a high level of sealing.

[0020] Preferably, the magnetic armature forms a concave, ring-shaped sealing surface at the sealing point, adapted to the shape of the sealing ring, in which the sealing element, designed as a sealing ring, is received with radially inner circumferential sealing contact. Preferably, the sealing ring is fixed to the sealing surface.

[0021] In a further embodiment of the invention, the housing forms an annular sealing surface at the sealing point, extending obliquely radially outwards in the direction of gas flow, acting as a sealing seat. The sealing element can be placed against this surface in a gas-tight manner in the deactivated position. In this way, a highly effective sealing contact is achieved. Furthermore, in the activated position of the magnetic armature, the sealing surface on the housing can thus act as a flow-guiding element when the gas injector is open, directing the gas flowing through the sealing seat between the sealing element and the housing.

[0022] Alternatively, the sealing element can also be injection-molded onto the magnetic armature or the housing at the sealing seat. It is also conceivable that, as an alternative, the sealing element is permanently mounted to the housing at the sealing seat as a sealing ring.

[0023] In a further preferred embodiment of the invention, the magnetic armature interacts with return spring means to return it to the deactivated position in actuating contact, and in this position, it is in annular sealing contact with a sealing element arranged in the gas flow. By arranging the magnetic armature in direct actuating and sealing contact, additional components, particularly for force transmission or sealing, are unnecessary. Furthermore, a particularly compact design with a high sealing effect can be achieved with a single sealing element.

[0024] It is also advantageous if the return spring means are preferably arranged as a helical compression spring in the pole tube of the electromagnet, acting coaxially on the outer diameter of the injector valve needle passing through the pole tube between the pole tube and the magnetic armature.

[0025] Preferably, the housing in the gas inlet area is designed in multiple parts, comprising an intermediate housing with the sealing point formed therein and a connecting housing with the hollow body fixedly arranged within it. This simplifies, in particular, the mounting of the sealing element at the sealing point and the hollow body on the magnetic armature.

[0026] Further claimed features of the invention will become apparent from the following description and from the drawings, which further explain the present invention. The drawings show: Fig. 1 a gas injector according to the invention for an internal combustion engine in a deactivated operating state, Fig. 2 an enlarged section from Fig. 1, Fig. 3. the gas injector in activated operating state, Fig. 4 an enlarged section from Fig. 3.

[0027] The figures show an exemplary gas injector according to the invention for an internal combustion engine. The gas injector has a multi-part housing 1 and an injector valve needle 3 slidably arranged therein along its longitudinal axis 2 for introducing and metering the gas flow into the combustion chamber (not shown) of the internal combustion engine. The gas injector is preferably designed for injecting hydrogen as fuel into the combustion chamber of the internal combustion engine.

[0028] To adjust the injector valve needle 3, an electrically energized electromagnet with a magnetic coil 4 and a slidably arranged magnetic armature 5 is provided in the housing 1. The latter and the injector valve needle 3 are arranged coaxially one behind the other in the housing 1 and are slidably arranged along the longitudinal axis 2, which also forms the axis of displacement. In the state where the magnetic coil 4 is not energized, the magnetic armature 5 can be decoupled from the injector valve needle 3 relative to it in a Fig. 1 and Fig. 2. The closed position shown can be reset.

[0029] At the gas inlet area 6 of the gas injector, the housing 1 is designed in multiple parts, comprising an intermediate housing 7 and a connection housing 8 axially connected to it. The latter forms a gas connection 9 at its free end for connection to a gas supply system (not shown) of the internal combustion engine with a gas reservoir, in particular a gas tank. The gas supply system supplies the gas injector at the gas connection 9 with a gas flow, here hydrogen, at high pressure, preferably 40 bar.

[0030] The intermediate housing 7 is connected axially downstream of the gas flow to a pole tube 10 of the electromagnet. For this purpose, it is axially inserted into the inner diameter of the pole tube 10 by means of a mounting section with its outer diameter, for example by pressing or welding. The pole tube 10 serves, firstly, to support and guide the magnetic armature 5. Secondly, the magnetic flux generated by the electromagnet or the magnetic coil 4 is conducted through the pole tube 10. The magnetic coil 4 is arranged coaxially within a magnetic housing 11, which is attached to the outer diameter of the pole tube 10.

[0031] A needle guide housing 13 is connected to the pole tube 10 in the axial direction towards the gas outlet 12 of the gas injector leading to the combustion chamber. The needle guide housing 13 is axially inserted into the inner diameter of the free end of the pole tube 10 by means of a mounting section with its outer diameter, for example by pressing or welding.

[0032] The injector valve needle 3 is axially displaceably guided in the pole tube 10 in a central axial first bore 14 and in the needle guide housing 13 in a central axial through-bore 15 coaxially connected to the first bore 14. It is designed as a hollow needle with an axially through central bore 41 for the passage of the gas, in this case hydrogen. For injecting and metering the gas flow into the combustion chamber, it forms a valve body 16 at the gas outlet 12 of the gas injector, which is arranged in a valve seat 17 formed at the outlet end of the through-bore 15 on the needle guide housing 13. The valve body 16 and the valve seat 17 form a needle valve with a disc-shaped valve body 16, at which the gas flow entering the combustion chamber can be metered. The needle guide housing 13 is radially offset inwards on its outer diameter towards the end facing the combustion chamber, opposite the pole tube 10.

[0033] In the pole tube 10, the magnetic armature 5 is axially displaceable relative to the injector valve needle 3 in a second bore 18 that extends axially from the first bore 14 towards the gas inlet area 6. The second bore 18 has a step 39 on its inner diameter compared to the first bore 14. The aforementioned bores 14 and 18 thus form a stepped bore in the pole tube 10.

[0034] In the activated position of the magnetic armature 5 according to Fig. 3 and Fig. 4. The gas injector is switched to the open position and gas is directed into the combustion chamber via the needle valve formed at the valve body 16 and the valve seat 17. The magnetic armature 5 is in direct actuating contact with the injector valve needle 3 from the activated position as in Fig. 3 and Fig. 4 represented by the injector valve needle 3 decoupleable in the de-energized state of the solenoid coil 4 into the in Fig. 1 and Fig. The deactivated position shown in Figure 2 can be reset with a small axial distance 35 to the injector valve needle 3. In the deactivated position, the gas injector is in the closed position, in which the gas supply to the combustion chamber of the internal combustion engine is interrupted.

[0035] To reset to the deactivated position according to Fig. 1 and Fig. 2 The magnetic armature 5 interacts with return spring means 19 arranged in the pole tube 10. These are arranged as helical compression springs coaxially on the outer diameter of the injector valve needle 3 in a radially outwardly offset expansion on the inner diameter of the first bore 14 on the pole tube 10 by a step and are supported with one end of the spring on the step of the bore 14 and with the other end of the spring on the axial end face 20 of the magnetic armature 5 facing the injector valve needle 3.

[0036] In the gas inlet area 6, the magnetic armature 5 and the intermediate housing 7 each form a sealing surface 23, 26 as a sealing seat with a sealing element 22 arranged in the gas flow ( Fig. 1 to 4), which is preferably designed as a sealing ring. For this purpose, a sealing surface 23 is formed on the axial side of the magnetic armature 5 facing the intermediate housing 7, into which the sealing element 22 is received.

[0037] Preferably, plastic is provided as the material for the sealing element 22, which allows for a particularly high level of sealing with low manufacturing accuracy.

[0038] The sealing element, made of an elastic material, can compensate for manufacturing inaccuracies in the connected components. Elastomers are particularly suitable for this purpose, although other suitable materials can also be used.

[0039] The magnetic armature 5 is radially inwardly drawn inwards at the outer diameter with a step 24 and forms a central axially projecting connecting pin 25. In the area of ​​the base of the connecting pin 25, the sealing surface 23 is formed on the outer diameter of the same as an annularly circumferential recess concave to the shape of the sealing ring 2, in which the sealing element 22 is fixedly arranged radially inwards with circumferential sealing contact.

[0040] Corresponding to the sealing surface 23 on the magnetic armature 5, a cylindrical sealing surface 26 extending annularly from the inner diameter of the intermediate housing 7 and projecting obliquely outwards. In this way, the sealing surface 26 is oriented obliquely to the longitudinal axis 2 radially inwards towards the sealing surface 23 on the magnetic armature 5 and the sealing element 22 arranged thereon.

[0041] Furthermore, in the activated position of the magnetic armature 5, Fig. 3 and Fig. 4 thus, in the open state of the gas injector, the sealing surface 26 acts in a flow-conducting manner to guide the gas flowing through the annular gap 42 between the sealing element 22 and the sealing surface 26 on the intermediate housing 8.

[0042] The sealing surface 26 is located at its radially outer end in the area of ​​several gas inlet openings 27 arranged in an annular pattern on the step 24 of the magnetic armature 5, which communicate with a flow channel 28 running centrally within the magnetic armature 5. Thus, when the sealing seat is open, the gas entering through the annular gap 42 at the sealing surface 26 is directed directly to the gas inlet openings 27 on the magnetic armature 5. The central flow channel 28 in the magnetic armature 5 can be configured as a blind bore extending from the axial end face 20 of the magnetic armature 5 facing the needle, as shown. Alternatively, the flow channel 28 can also be configured as a through bore.

[0043] In the gas inlet area 6, the intermediate housing 7 forms a radial annular gap 29 on its inner side, relative to the outer diameter of the connecting pin 25. The gas can flow axially towards the sealing point 21 at the annular gap 29.

[0044] By resetting the magnetic armature 5 into the in Fig. 1 and Fig. In the deactivated position shown in Figure 2, the sealing element 22 is pressed radially outwards against the sealing surface 26 on the intermediate housing 7 to form an annular sealing contact, and the gas flow entering at the sealing point 21 is shut off. The gas injector is thus in a deactivated operating state.

[0045] Due to the inclined orientation of the sealing surface 26 on the intermediate housing 7, the sealing element 22 is pressed against the step 24 at the sealing surface 23 on the magnetic armature 5 at an angle to the longitudinal axis 2. This ensures a particularly secure arrangement of the sealing element 22 in the sealing seat on the sealing surfaces 23 and 26, while simultaneously achieving a high sealing effect. Consequently, when the engine is switched off, gas leakage from the gas inlet area 6 into the combustion chamber of the internal combustion engine can be prevented or at least reduced to a harmless level.

[0046] The magnetic armature 5 is axially connected to a hollow body 30, which is fixedly arranged coaxially within the gas flow in the connection housing 8, by means of the connecting pin 25 which projects axially into the connection housing 8. The hollow body 30 is gas-tight and elastically flexible in the axial direction, i.e., in the direction of movement of the magnetic armature 5. It is preferably rotationally symmetrical about the longitudinal axis 2, here formed as a closed hollow cylinder. The hollow body 30 is preferably designed as a metal bellows, which is particularly easy to implement, as shown.

[0047] The arrangement of the hollow body 30 ensures that a surface on which the pressure acts opposite to the opening direction of the injector valve needle 1 is subjected to the same pressure as the sealing seat 23, 26 on the intermediate housing 7. If the diameter of the hollow body 30 is equal to or greater than the diameter of the sealing seat, the pressure prevailing in the gas inlet area 6, particularly in the connection housing 8 in front of the sealing point 21, has a closing effect.

[0048] The connection of the magnetic armature 5 to the hollow body 30 allows the gas pressure prevailing in the gas inlet area 6, particularly in the connection housing 8, to exert a resulting static force on the magnetic armature 5 via the hollow body 30, and thus on the sealing seat 23, 26. This force acts in the direction of the movement of the magnetic armature 5 into the deactivated position, thereby closing the sealing position at the sealing seat of the sealing surfaces 23, 26 and shutting off the gas flow. Since this force increases with the gas pressure in the gas inlet area 6, the sealing effect at the sealing seat 23, 26 is strengthened with increasing gas pressure. In this way, a tight seal at the sealing seat 26 can be ensured even at very high gas pressures, especially in the event of malfunctions.

[0049] This also facilitates the return of the magnetic armature 5 to the deactivated position; in particular, the return spring means 19 can be designed with a correspondingly reduced spring force.

[0050] The design of the hollow body 30 can be optimized with respect to the sealing seat 21 if, preferably, the hydraulic diameter 31 of the metal bellows 30, i.e., the hydraulically effective diameter, particularly with regard to pressure loss and gas flow, is at least equal to and preferably larger than the contact diameter 32 of the annular sealing contact of the sealing element 22 with the sealing surface 26 of the intermediate housing 7. By increasing the hydraulic diameter 31 of the hollow body 30 beyond the size of the contact diameter 32 of the sealing contact, the resulting closing force can be increased.

[0051] The magnetic armature 5 is axially inserted into a cup-shaped first connection piece 33 on the hollow body 30 with the outer diameter of the free end of the connecting pin 25 and is secured, for example, by being pressed in or welded to it. On the other hand, the hollow body 30 is attached to the inner diameter of the connection housing 8 by a second connection piece 34, preferably by welding.

[0052] To switch to the activated position according to the Fig. 3 and Fig. 4. The magnetic coil 4 is energized and the magnetic armature 5 is attracted axially to the pole tube 10. This causes the magnetic armature 5 with the sealing element 22 to move from the deactivated position according to Fig. 1 and Fig. 2 away from the intermediate housing 7. Consequently, the sealing seat at the sealing surfaces 23, 26 with the annular gap 42 is opened to allow gas passage. After the small axial displacement 35, the magnetic armature 5, with its axial end face 20 facing the injector valve needle 3, comes into direct contact with the opposite end face 37 of the injector valve needle 3 and accelerates it.

[0053] After a further axial displacement 40, the magnetic armature 5 reaches the activated position at the end stop 38 on the stage 39 in the offset second bore 18 on the pole tube 10. This moves the valve body 16 out of the valve seat 17, opening an annular gap 43 between the valve body 16 and the valve seat 17, and thus opening the needle valve, allowing the gas, in this case hydrogen, to flow into the combustion chamber of the internal combustion engine. The gas injector is now in its activated operating state.

[0054] In the activated operating state, the gas flows at the gas connection 9 into the connection housing 8 to the sealing seat 21 and via the gas inlet openings 27 on the magnetic armature 5 into the central flow channel 28 and enters the axially opposite central bore 41 of the injector valve needle 3 at its open end. In the region of the valve body 16, the gas flows from the gas outlet openings 44, which are directed obliquely outwards towards it, into the through-bore 15 on the needle guide housing 13 and through the annular gap 43 formed between the valve body 16 and the valve seat 17 into the combustion chamber.

[0055] When the current to the solenoid coil 4 is cut off, the injector valve needle 3 is moved towards the deactivated position, i.e., in the closing direction, by the return spring means 45 acting in conjunction with it, and the magnetic armature 5 is moved towards the deactivated position by the return spring means 19. In this process, the valve body 16 reaches the valve seat 17 again, and the injector valve needle 3 stops. The needle valve to the combustion chamber is thus closed again. At the same time, the magnetic armature 5 moves a further distance 35 relative to the injector valve needle 3 until it reaches the deactivated position ( Fig. 1 and Fig. 2) at the sealing point 21 the sealing element 22 is pressed gas-tight into the sealing seat on the sealing surfaces 23, 26 and, in the deactivated state of the gas injector, the gas supply is shut off again at the sealing point 21.

[0056] The return spring elements 45, which interact with the injector valve needle 3, are preferably arranged in the region of the end of the through-bore 15 in the needle guide housing 13 facing the pole tube 10. They are arranged coaxially to the injector valve needle 3 on the outer diameter of the through-bore 15 in a recess 46 that is offset radially outwards on the inner diameter of the through-bore 15. The return spring elements 45 are supported at one end in the recess 46 on the needle guide housing 13 and at the other end on a spring support 47 that is fixedly connected to the injector valve needle 3. Reference symbol list 1 case 2 Longitudinal axis 3 Injector valve needle 4. Magnetic coil, electromagnet 5 magnetic armature, electromagnet 6 Gas inlet area 7 intermediate housings 8 connection housings 9 Gas connection 10 pole tube, electromagnet 11 Magnet housing, electromagnet 12 Gas leak 13 Needle guide housings 14 first bore 15 through holes 16 valve bodies 17 Valve seat 18 second bore 19 Return spring means, helical compression spring 20 axial end face of the magnetic armature 21 Sealing point, sealing seat 22 Sealing element, sealing ring 23 Sealing surface on the magnetic armature, sealing seat 24th stage on the magnetic armature 25 connection pins 26 Contact surface, sealing surface on the intermediate housing, sealing seat 27 Gas inlet opening on the magnetic armature 28 Flow channel 29 radial annular gap 30 hollow bodies, metal bellows 31 Outer diameter of the hollow body, hydraulic diameter 32 Contact diameter of the sealing contact 33 first connecting piece 34 second connector 35 axial displacement, distance 37 axial face of the injector valve needle 38 End stop Level 39 40 axial displacement 41 central bore in the injector valve needle 42 annular gap 43 Annular gap 44 Gas outlet 45 recess 46 Return spring means 47 Spring support

Claims

[1] Gas injector for an internal combustion engine, comprising a housing (1) and an injector valve needle (3) arranged therein slidably along its longitudinal axis (2) for introducing and metering a gas flow into the combustion chamber of the internal combustion engine and an electrically energizable electromagnet with a slidably arranged magnetic armature (5) for adjusting the injector valve needle (3), characterized by , that the magnetic armature (5) can be decoupled from the injector valve needle (3) in an activated position and returned to a deactivated position when de-energized, and that the gas flow through the magnetic armature (5) can be gas-tightly shut off at a sealing point (21) in sealing contact with at least one sealing element (22), wherein the magnetic armature (5) is connected to a hollow body (30) arranged coaxially and fixedly in the housing (8) in the gas flow, which is gas-tight and axially elastic. [2] Gas injector according to claim 1, characterized by, that the magnetic armature (5) can be directly coupled to the injector valve needle (3) to the actuating contact. [3] Gas injector according to one of claims 1 or 2, characterized by , that the hydraulically effective diameter (31) of the hollow body (30) is equal to or greater than the contact diameter (32) of the sealing contact of the sealing element (22) with the contact surface (26) formed on the sealing partner of the magnetic armature (5). [4] Gas injector according to any one of claims 1 to 3, characterized by , that the hollow body (30) is designed as a metal bellows. [5] Gas injector according to any one of claims 1 to 4, characterized by , that plastic is provided as the material for the sealing element (22). [6] Gas injector according to any one of claims 1 to 5, characterized by , that the magnetic armature (5) and the housing (1) each form a sealing seat (23, 26) at the sealing point (21) for annular sealing contact with at least one sealing element (22). [7] Gas injector according to any one of claims 1 to 6, characterized by , that at the sealing point (21) the magnetic armature (5) forms an annular circumferential concave sealing surface (23) as a sealing seat for the sealing element (22) in which the sealing element (22) designed as a sealing ring with radially inner circumferential sealing contact is received. [8] Gas injector according to any one of claims 1 to 7, characterized by , that the housing (1) at the sealing point (21) forms an annular circumferential sealing surface (26) extending obliquely radially outwards in the direction of the gas flow as a sealing seat, on which the sealing element (22) can be placed gas-tight in the deactivated position. [9] Gas injector according to one of claims 1 or 8, characterized by, that the magnetic armature (5) on the one hand cooperates with return spring means (19) to return to the deactivated position in actuating contact and on the other hand is in annular sealing contact with a sealing element (22) arranged in the gas flow at the sealing point (21). [10] Gas injector according to any one of claims 1 to 9, characterized by , that the housing (1) in the gas inlet area (6) is designed in multiple parts with an intermediate housing (7) with the sealing point (21) formed in it and a connecting housing (8) connected to it with the hollow body (27) fixedly arranged in it.

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