Pre-chamber assembly for an internal combustion engine

Abstract

Pre-chamber assembly for an internal combustion engine, comprising at least one pre-chamber gas valve (2) for supplying air, fuel or an air-fuel-mixture to the pre-chamber (3), wherein the pre- chamber gas valve (2) comprises a pre-chamber gas valve seat (4) and a pre-chamber gas valve body (5), wherein a mechanical actuation system (5) for actuating the pre-chamber gas valve (2) is provided, wherein the mechanical actuation system (6) is configured to impart a motion on the pre-chamber gas valve body (5) for opening and / or closing the at least one pre-chamber gas valve ( 2).

Description

[0001] Pre-chamber assembly for an internal combustion engine

[0002] The present invention relates to a pre-chamber assembly for an internal combustion engine according to the preamble of claim 1 and an internal combustion engine and / or cylinder head for an internal combustion engine comprising such a pre-chamber assembly .

[0003] Pre-chambers are used as ignition ampli fiers for internal combustion engines , preferably starting from a certain si ze of internal gas engines ( generally with cylinder capacity above about four liters ) , in order to properly ignite lean air- fuel-mixture in the large volume of the cylinders .

[0004] Such pre-chambers in most cases are supplied with air, fuel or an air- fuel-mixture separately from the main combustion chamber .

[0005] Therefore , it is known by the state of the art that pre-chamber assemblies for internal combustion engines comprise at least one pre-chamber gas valve for supplying air, fuel or an air- fuelmixture to the pre-chamber, wherein the pre-chamber gas valve comprises a pre-chamber gas valve seat and a pre-chamber gas valve body .

[0006] Such pre-chamber gas valves in most cases are provided by passive gas valves , e . g . check valves or non-return valves , wherein during the inlet stroke of the internal combustion engine an inlet pressure of the fuel , air or air- fuel mixture to be fed into the pre-chamber exceeds a pressure present in the pre-chamber and therefore the passive pre-chamber gas valve opens .

[0007] Such passive pre-chamber gas valves are essentially not controllable and do not have the potential to control exact amounts and timings for supplying or supplied to the pre-chamber . Therefore , such configurations have the disadvantage that they do not have the potential to control exact amounts and timings for supplying or supplied to the pre-chamber, as the pressure ratios can vary during the operation o f the internal combustion engine ( e . g . in reaction to changes in operation, load or quality of fuel ) .

[0008] The obj ect of the present invention is therefore to provide a prechamber assembly for an internal combustion engine as well as a cylinder head or an internal combustion engine having such a prechamber assembly which at least partly improves upon the mentioned negative ef fects compared to the prior art and / or to provide a more reliable pre-chamber system and / or to provide a more consistent actuation of the pre-chamber gas valve and / or to provide a pre-chamber assembly requiring less space .

[0009] This obj ect is achieved with a pre-chamber assembly for an internal combustion engine with the features of claim 1 as well as a cylinder head and / or an internal combustion engine having such a pre-chamber assembly .

[0010] According to the invention, a pre-chamber assembly for an internal combustion engine comprises at least one pre-chamber gas valve for supplying air, fuel or an air- fuel-mixture to the pre-chamber, wherein the pre-chamber gas valve comprises a pre-chamber gas valve seat and a pre-chamber gas valve body, wherein a mechanical actuation system for actuating the pre-chamber gas valve i s provided, wherein the mechanical actuation system is configured to impart a motion on the pre-chamber gas valve body for opening and / or closing the at least one pre-chamber gas valve .

[0011] A mechanical actuation system which imparts a motion onto the prechamber gas valve body ( i . e . , not relying on pressure di f ferences ) can drastically improve the consistency of the actuation of the pre-chamber gas valve .

[0012] Furthermore , taking advantage of a mechanical actuation system already present motions of other components of the internal combustion engine may be trans ferred to actuate the pre-chamber gas valve , such that in an ef ficient and / or energy serving way a reliable actuation system of the pre-chamber gas valve can be provided .

[0013] Already present internal combustion engines can be upgraded with at least one pre-chamber assembly according to the invention .

[0014] All measures and features described in connection with the prior art can also be taken in connection with the invention .

[0015] The invention can preferably be used in conj unction with a reciprocating piston engine, in particular driving a generator for creating electrical energy . Combinations of internal combustion engines driving a generator are known as gensets .

[0016] It can pe provided that the motion imparted on the pre-chamber gas valve body is essentially linear, particularly preferably essentially exclusively linear, i . e . , without superposed rotational motions . Embodiments with rotational or mixed motions imparted on the per-chamber gas valve body are in principle conceivable .

[0017] It can be provided that not exclusively a linear motion is imparted on the pre-chamber gas valve body by the mechanical actuation system for opening and / or closing the at least one pre-chamber gas valve , but preferably essentially only linear motions . The motion imparted on the pre-chamber gas valve body of the mechanical actuation system can be used to provide a motion of the pre-chamber gas valve body relative to a valve seat of the prechamber gas valve body, wherein by li fting of f the pre-chamber gas valve body from the valve seat of the pre-chamber gas valve body an opening of the pre-chamber gas valve is performed and / or by moving the pre-chamber gas valve body onto the pre-chamber gas valve seat a closing of the pre-chamber gas valve is performed .

[0018] Advantageous embodiments are defined in the dependent claims .

[0019] It can be provided that mechanical actuation system i s provided purely mechanical , wherein e . g . no electrical or hydraulic actuation (with a possible exception of hydraulic valve lash compensation) is done .

[0020] It can be provided that the mechanical actuation system comprises at least one pre-chamber gas valve rod .

[0021] It can be provided that a linear motion is imparted on the prechamber gas valve body for opening and / or closing the at least one pre-chamber gas valve by the pre-chamber gas valve rod of the mechanical actuation system .

[0022] The pre-chamber gas valve rod is provided e . g . to trans fer actuation motions (preferably already present ) from an actuator to the pre-chamber gas valve body, wherein by the pre-chamber gas valve rod a linear motion is imparted on the pre-chamber gas valve body .

[0023] It can be provided that the at least one pre-chamber gas valve rod is pivotably connected at a first end to the pre-chamber gas valve body and / or at a second end to an actuation system . Therefore , it can be provided that the pre-chamber gas valve rod is used to trans fer a motion o f the actuation system into a linear motion which is used to be imparted by the pre-chamber gas valve rod on the pre-chamber gas valve body .

[0024] It can be provided that the pre-chamber gas valve rod comprises along its longitudinal extension at least two separate pre-chamber gas valve rod components , which are adj ustably connected relative to each other, preferably by a screw connection, wherein a longitudinal extension of the pre-chamber gas valve rod can be adj usted .

[0025] By adj usting the longitudinal extension of the pre-chamber gas valve rod, e . g . , the opening and / or closing characteristic of the pre-chamber gas valve can be adj usted, wherein the timing o f opening and / or closing, the opening time ( i . e . , the time period during which the pre-chamber gas valve is open) , the closing time ( i . e . , the time period during which the pre-chamber gas valve is closed) and / or the opening stroke can be adj usted, wherein the supplied volume of air, fuel , or the air fuel mixture as well as the timing of the supplying via the pre-chamber gas valve is adj ustable .

[0026] It can be provided that the pre-chamber gas valve rod comprises at least two pre-chamber gas valve rod components which are rotatably connected to each other, wherein the pre-chamber gas valve rod component contacting the pre-chamber gas valve body is pivotable relative to another one of the at least two pre-chamber gas valve rod components via a first pivot .

[0027] It can be provided that at least one of the at least two prechamber gas valve rod components comprise an L-shape . By user of an L-shape e . g . areas directly can be freed for additional components of the internal combustion engine . It can be provided that the pre-chamber gas valve rod is provided by the at least two pre-chamber gas valve rod components which are rotatably connected to each other ( e . g . wherein a crank mechanism and / or mechanical linkage is formed) .

[0028] It can be provided that the pre-chamber gas valve rod component contacting the pre-chamber gas valve body comprises at the contact surface between the pre-chamber gas valve rod component and the pre-chamber gas valve body along its contact surface a variable distance from the first pivot .

[0029] By use of a variable distance from the first pivot the pre-chamber gas valve rod component can trans fer a linear motion to the prechamber gas valve body when the pre-chamber gas valve rod component is rotated around the first pivot ( similar to a cam of a cam shaft ) .

[0030] By choosing an accurate variation of the distance of the contact surface from the first pivot , the supplied volume and the timing of the supplying via the pre-chamber gas valve are adj ustable .

[0031] It can be provided that between the pre-chamber gas valve rod and the pre-chamber gas valve body at least one , preferably spherical and / or cylindrical (preferably with circular base area ) , decoupling component is arranged, transmitting an actuation motion from the pre-chamber gas valve rod to the pre-chamber gas valve body .

[0032] By use of such a decoupling element between the pre-chamber gas valve rod and the pre-chamber gas valve body it can be provided that only linear motions acting along a longitudinal extension of the pre-chamber gas valve body are transmitted to the pre-chamber gas valve body . The pre-chamber gas valve body can therefore be prevented from other motions , e . g . oblique to the longitudinal extension of the pre-chamber gas valve body, of the pre-chamber gas valve rod (motions which might damage or af fect the operation of the pre-chamber gas valve ) .

[0033] It can be provided that the mechanical actuation system is connected to and / or comprises a rocker arm .

[0034] It can be provided that the rocker arm is pivoted on a second pivot and configured to actuate at least one inlet valve and / or outlet valve of the internal combustion engine for opening and closing the at least one inlet valve and / or outlet valve , particularly preferred wherein a push rod is connected to the rocker arm for actuating the rocker arm and therefore the at least one inlet valve and / or outlet valve .

[0035] It can be provided that the mechanical actuation system is configured to transmit a rotational motion of a cam shaft of the internal combustion engine to the pre-chamber gas valve body .

[0036] In particularly preferred embodiments the rotational motion of the cam shaft is trans ferred to a motion of the rocker arm through a push rod which is pivotably connected to the rocker arm . In such embodiments preferably the rocker arm is configured to actuate the at least inlet valve and / or the at least one outlet valve .

[0037] It can be provided that the pre-chamber gas valve body is configured to be moved linearly along its longitudinal axis relative to the pre-chamber gas valve seat to perform an opening and / or closing of the pre-chamber gas valve .

[0038] It can be provided that the pre-chamber gas valve comprises at least one spring, wherein the spring is configured to perform a closing motion of the pre-chamber gas valve and / or keep the pre- chamber gas valve closed, preferably i f no linear motion is imparted by the mechanical actuation system .

[0039] It can be provided that the at least one spring biases the prechamber gas valve body onto the valve seat .

[0040] In preferred embodiments the pre-chamber gas valve body is long enough to extend from the pre-chamber gas valve and / or the valve seat thereof to an exterior o f a component part making up a part of the pre-chamber, preferably a top part of the pre-chamber .

[0041] Also , protection is sought for an internal combustion engine , preferably a reciprocating cylinder piston engine , and / or cylinder head for an internal combustion engine comprising at least one pre-chamber assembly according to the invention .

[0042] Further details and advantages of the invention are apparent from the accompanying figures and the following description of the drawings . The figures show :

[0043] Fig . 1 a first embodiment of a pre-chamber assembly according to the invention,

[0044] Fig . 2 the first embodiment of Fig . 1 in a closed position of the pre-chamber gas valve ,

[0045] Fig . 3 the first embodiment of Fig . 1 in an open position of the pre-chamber gas valve ,

[0046] Fig . 4 a second embodiment of a pre-chamber assembly according to the invention,

[0047] Fig . 5 the second embodiment of Fig . 4 in a closed position of the pre-chamber gas valve ,

[0048] Fig . 6 the second embodiment of Fig . 4 in an open position of the pre-chamber gas valve , Fig . 7 a third embodiment of a pre-chamber assembly according to the invention,

[0049] Fig . 8 the third embodiment of Fig . 7 in a closed position of the pre-chamber gas valve , and

[0050] Fig . 9 the third embodiment of Fig . 7 in an open position of the pre-chamber gas valve .

[0051] Fig . 1 discloses a first embodiment of a pre-chamber assembly 1 according to the invention .

[0052] The first embodiment of a pre-chamber assembly 1 of Fig 1 i s shown in Fig . 2 in a closed position of the pre-chamber gas valve 2 and in Fig . 3 in an open position of the pre-chamber gas valve 2 .

[0053] The first embodiment of the assembly 1 of Fig . 1 to 3 comprises a rocker arm 24 pivotally connected to the second pivot 18 .

[0054] The rocker arm 24 is configured to actuate at least one inlet valve 19 and / or outlet valve 20 for opening and closing the at least one inlet valve 19 and / or outlet valve 20 .

[0055] The at least one inlet valve 19 and / or outlet valve 20 is therefore connected to the rocker arm 24 , wherein the pivoting motions of the rocker arm 24 is trans formed in a known way to a linear operation for opening and closing the at least one inlet valve 19 and / or outlet valve 20 along its longitudinal axis .

[0056] The rocker arm 24 ( as is in and o f itsel f known in the state o f the art ) is actuated by a push rod (not shown for reasons of clarity) which can be connected to the rocker arm 24 at the connecting point 23 , wherein the rocker arm 24 is pivotable and therefore the at least one inlet valve 19 and / or outlet valve 20 is linearly actuated . The push rod can be actuated by a cam shaft of the internal combustion engine , wherein by the eccentric geometry o f the cam shaft the linear motion and actuation motion for the rocker arm 24 can by created .

[0057] Furthermore , the pre-chamber assembly 1 comprises a pre-chamber gas valve 2 for supplying air, fuel or an air- fuel-mixture to the pre-chamber 3 .

[0058] The pre-chamber gas valve 2 comprises a pre-chamber gas valve seat

[0059] 4 and a pre-chamber gas valve body 5 , wherein by a l inear motion of the pre-chamber gas valve body 5 the pre-chamber gas valve body

[0060] 5 can be moved relatively to ( li fted from) the pre-chamber gas valve seat 4 to perform for opening and / or closing the at least one pre-chamber gas valve 2 .

[0061] In other words : The pre-chamber gas valve body 5 is configured to be moved linearly along its longitudinal axis relative to the prechamber gas valve seat 4 to perform an opening and / or closing of the pre-chamber gas valve 2 .

[0062] For actuating the pre-chamber gas valve 2 , a mechanical actuation system 5 is provided .

[0063] The mechanical actuating system 6 o f the first embodiment disclosed by Fig . 1 to 3 is provided by a pre-chamber gas valve rod 7 .

[0064] The pre-chamber gas valve rod 7 is pivotably connected at a first end to the pre-chamber gas valve body 5 and / or at a second end in the connecting point 23 to the actuation system 8 ( the rocker arm 24 ) . Furthermore , the pre-chamber gas valve rod 7 shown by Fig . 1 to 3 is linearly guided by the linear guiding device 21 ( as can be seen in more detail by the two di f ferent positions of the pre-chamber gas valve rod 7 of Fig . 2 and 3 ) .

[0065] By the motion of the pre-chamber gas valve rod 7 caused by the rocker arm 24 , the pre-chamber gas valve rod 7 imparts a linear motion on the pre-chamber gas valve body 5 via the contact surface 14 of the pre-chamber gas valve rod 7 .

[0066] Between the pre-chamber gas valve rod 7 and the pre-chamber gas valve body 5 , a spherical decoupling component 16 is provided, transmitting the linear motion from the pre-chamber gas valve rod 7 to the pre-chamber gas valve body 5 .

[0067] By use of such a decoupling element 16 between the pre-chamber gas valve rod 7 and the pre-chamber gas valve body 5 , essentially only linear motions acting along a longitudinal extension of the prechamber gas valve body 5 can be transmitted to the pre-chamber gas valve body 5 . The pre-chamber gas valve body 5 can therefore be prevented from other motions , e . g . , oblique to the longitudinal extension of the pre-chamber gas valve body 5 , done by the prechamber gas valve rod 7 (motions which might damage or af fect the operation of the pre-chamber gas valve 2 ) .

[0068] Speci fically in this embodiment , the linear motion imparted on the pre-chamber gas valve body 5 is used to implement an opening of the pre-chamber gas valve 2 . For closing the pre-chamber gas valve 2 , a spring (not shown for reasons of clarity) is provided, wherein the spring is configured to perform a closing motion of the prechamber gas valve 2 and / or to keep the pre-chamber gas valve 2 closed . The pre-chamber gas valve rod 7 of Fig . 1 to 3 comprises along its longitudinal extension three separate pre-chamber gas valve rod components 9 , 10 , 11 , which are adj ustably connected relative to each other ( in this embodiment by a screw connection) , wherein a longitudinal extension of the pre-chamber gas valve rod 7 can be adj usted .

[0069] In this embodiment an axis of the screw connection and a longitudinal axis of the pre-chamber gas valve rod 7 essentially coincide .

[0070] To lock the connection of the three separate pre-chamber gas valve rod components 9 , 10 , 11 , furthermore , two counter nuts 25 are provided in this embodiment . Also embodiments using only one counter nut 25 are quite possible .

[0071] By adj usting the longitudinal extension of the pre-chamber gas valve rod 7 , the opening and / or closing characteristic of the prechamber gas valve 2 can be adj usted .

[0072] Fig . 4 discloses a second embodiment of a pre-chamber assembly 1 according to the invention .

[0073] The second embodiment of a pre-chamber assembly 1 of Fig 4 is shown in Fig . 5 in a closing position of the pre-chamber gas valve 2 and in Fig . 6 in an opening position of the pre-chamber gas valve 2 .

[0074] Compared to the first embodiment , the second embodiment of Fig . 4 to 6 comprises a pre-chamber gas valve rod 7 provided by two prechamber gas valve rod components 12 , 13 which are rotatably connected to each other, wherein the pre-chamber gas valve rod component 13 contacting the pre-chamber gas valve body 5 is pivotally connected to a first pivot 15 . The pre-chamber gas valve rod component 13 contacting the prechamber gas valve body 5 comprises at the contact surface 14 between the pre-chamber gas valve rod component 13 and the prechamber gas valve body 5 along its contact surface a variable distance from the first pivot 15 .

[0075] By use of a variable di stance o f the contact surface 14 from the first pivot 15 the pre-chamber gas valve rod component 13 can trans fer a linear motion to the pre-chamber gas valve body 13 when the pre-chamber gas valve rod component 13 is rotated around the first pivot 15 .

[0076] By choosing an accurate variation of the distance of the contact surface 14 from the first pivot 15 , the supplied volume and the timing of the supplying via the pre-chamber gas valve 2 is adj ustable ( in other words : the opening and / or closing characteristic of the pre-chamber gas valve 2 can be adj usted) .

[0077] The remaining characteristics of the second embodiment shown by Fig . 4 to 6 essentially comply with the first embodiment shown by Fig . 1 to 3 .

[0078] Fig . 7 discloses a third embodiment of a pre-chamber assembly 1 according to the invention .

[0079] The third embodiment of a pre-chamber assembly 1 of Fig 7 i s shown in Fig . 8 in a closed position of the pre-chamber gas valve 2 and in Fig . 9 in an open position of the pre-chamber gas valve 2 .

[0080] As well as the second embodiment also the third embodiment of Fig . 7 to 9 comprises a pre-chamber gas valve rod 7 provided by two pre-chamber gas valve rod components 12 , 13 which are rotatably connected to each other, wherein the pre-chamber gas valve rod component 13 contacting the pre-chamber gas valve body 5 is pivotally connected to a first pivot 15 .

[0081] Compared to the second embodiment , the third embodiment disclosed by the Fig . 7 to 9 comprises a pre-chamber gas valve rod component 13 designed with an L-shape , whereby the area directly above the pre-chamber gas valve 2 can be freed for additional components of the internal combustion engine .

[0082] The pre-chamber gas valve rod component 13 is pivotably arranged at the first pivot 15 .

[0083] The pre-chamber gas valve rod component 13 furthermore comprises a decoupling component 16 rotatably connected to the pre-chamber gas valve rod component 13 around the first pivot 15 , wherein the contacting surface 14 between the pre-chamber gas valve rod component 13 and the pre-chamber gas valve body 5 i s formed by the circumference of the decoupling component 16 .

[0084] The advantage of the usage of such a decoupling component 16 is that essentially only linear motions acting along a longitudinal extension of the pre-chamber gas valve body 5 can be transmitted to the pre-chamber gas valve body 5 .

[0085] The pre-chamber gas valve body 5 can therefore be prevented from other motions , e . g . , oblique to the longitudinal extension of the pre-chamber gas valve body 5 , done by the pre-chamber gas valve rod 7 (motions which might damage or af fect the operation of the pre-chamber gas valve 2 ) .

[0086] The remaining characteristics of the third embodiment shown by Fig . 7 to 9 essentially analogous with respect to the second embodiment shown by Fig . 4 to 6 . List of used reference signs :

[0087] 1 pre-chamber assembly

[0088] 2 pre-chamber gas valve

[0089] 3 pre-chamber

[0090] 4 pre-chamber gas valve seat

[0091] 5 pre-chamber gas valve body

[0092] 6 mechanical actuation system

[0093] 7 pre-chamber gas valve rod

[0094] 8 actuation system

[0095] 9 pre-chamber gas valve rod component

[0096] 10 pre-chamber gas valve rod component

[0097] 11 pre-chamber gas valve rod component

[0098] 12 pre-chamber gas valve rod component

[0099] 13 pre-chamber gas valve rod component

[0100] 14 contact surface

[0101] 15 first pivot ( of pre-chamber gas valve rod)

[0102] 16 decoupling component

[0103] 17 cylinder head

[0104] 18 second pivot ( of rocker arm)

[0105] 19 inlet valve

[0106] 20 outlet valve

[0107] 21 linear guiding

[0108] 22 connecting point (push rod)

[0109] 23 connecting point (pre-chamber gas valve rod)

[0110] 24 rocker arm

[0111] 25 counter nut

Claims

Claims :

1. Pre-chamber assembly for an internal combustion engine, comprising at least one pre-chamber gas valve (2) for supplying air, fuel or an air-fuel-mixture to the pre-chamber (3) , wherein the pre-chamber gas valve (2) comprises a pre-chamber gas valve seat (4) and a pre-chamber gas valve body (5) , characterized in that a mechanical actuation system (5) for actuating the prechamber gas valve (2) is provided, wherein the mechanical actuation system (6) is configured to impart a motion on the pre-chamber gas valve body (5) for opening and / or closing the at least one pre-chamber gas valve (2) .

2. Pre-chamber assembly according to claim 1, wherein the mechanical actuation system (6) comprises at least one prechamber gas valve rod (7) .

3. Pre-chamber assembly according to claim 2, wherein the at least one pre-chamber gas valve rod (7) is pivotably connected at a first end to the pre-chamber gas valve body (5) and / or at a second end to an actuation system (8) .

4. Pre-chamber assembly according to claim 2 or 3, wherein the pre-chamber gas valve rod (7) comprises along its longitudinal extension at least two separate pre-chamber gas valve rod components (9, 10, 11) , which are adjustably connected relative to each other, preferably by a screw connection, wherein a longitudinal extension of the pre-chamber gas valve rod (7) can be adjusted.

5. Pre-chamber assembly according to at least one of the claims 2 to 4, wherein the pre-chamber gas valve rod (7) comprises at least two pre-chamber gas valve rod components (12, 13) whichare rotatably connected to each other, wherein one of the at least two pre-chamber gas valve rod components (13) contacting the pre-chamber gas valve body (5) is pivotable relative to another one of the at least two pre-chamber gas valve rod components (12, 13) via a first pivot (15) .

6. Pre-chamber assembly according to claim 5, wherein at least one of the at least two pre-chamber gas valve rod components (12, 13) is provided with an L-shape.

7. Pre-chamber assembly according to claim 5 or 6, wherein the pre-chamber gas valve rod component (13) contacting the prechamber gas valve body (5) comprises at a contact surface (14) between the pre-chamber gas valve rod component (13) and the pre-chamber gas valve body (5) along its contact surface a variable distance from the first pivot (15) .

8. Pre-chamber assembly according to at least one of the claims 2 to 7, wherein between the pre-chamber gas valve rod (7) and the pre-chamber gas valve body (5) at least one, preferably spherical, decoupling component (16) is arranged, transmitting an actuation motion from the pre-chamber gas valve rod (7) to the pre-chamber gas valve body (5) .

9. Pre-chamber assembly according to one of the preceding claims, preferably according to claim 3, wherein the mechanical actuation system (6) is connected to and / or comprises a rocker arm (24 ) .

10. Pre-chamber assembly according to claim 9, wherein the rocker arm (24) is pivoted on a second pivot (18) and configured to actuate at least one inlet valve (19) and / or outlet valve (20) of the internal combustion engine for opening and closing the at least one inlet valve (19) and / or outlet valve (20) ,preferably wherein a push rod is connected to the rocker arm (24) for actuating the rocker arm (24) and therefore the at least one inlet valve (19) and / or outlet valve (20) .

11. Pre-chamber assembly according to at least one of the preceding claims, wherein the mechanical actuation system (6) is configured to transmit a rotational motion of a camshaft of the internal combustion engine to the pre-chamber gas valve body ( 7 ) .

12. Pre-chamber assembly according to at least one of the preceding claims, wherein the pre-chamber gas valve body (5) is configured to be moved linearly along its longitudinal axis relative to the pre-chamber gas valve seat (4) to perform an opening and / or closing of the pre-chamber gas valve (2) .

13. Pre-chamber assembly according to at least one of the preceding claims, wherein the pre-chamber gas valve (2) comprises at least one spring, wherein the spring is configured to perform a closing motion of the pre-chamber gas valve (2) and / or keep the pre-chamber gas valve (2) closed.

14. Internal combustion engine, preferably a reciprocating cylinder piston engine, and / or cylinder head (17) for an internal combustion engine comprising at least one pre-chamber assembly (1) according to at least one of the preceding claims.

Images