Cylinder head for an internal combustion engine with a combustion chamber and the use of a sealing sleeve to seal off a cylinder head

Abstract

The invention relates to a cylinder head for an internal combustion engine with a combustion chamber, comprising: a main body (2) with a combustion chamber wall (5) for sealing off the combustion chamber of the internal combustion engine, the main body (2) having a cut-out (11) which penetrates the combustion chamber wall (5) with a first opening (12), and a support portion (18) with a tapering inner support surface (19); and a sealing sleeve (15) which has a sealing portion (16) with a tapering outer sealing surface (17), the sealing sleeve (15) and the main body (2) being braced together such that the support surface (19) and the sealing surface (17) are in sealing contact, and wherein at least one of the support portion (18) and / or the sealing portion (16) is at least partially plastically deformed.

Description

[0001] The present invention relates to a cylinder head for an internal combustion engine with a combustion chamber and the use of a sealing sleeve for sealing a cylinder head.

[0002] Cylinder heads close off the combustion chamber of internal combustion engines on the side opposite the piston. Cylinder heads integrate intake and exhaust ports, oil channels for lubricating mechanically moving parts, and coolant channels. The cylinder head also houses the valves, valve train, and injectors and ignition components. These components are located in recesses that extend through the cylinder head body from a combustion chamber wall facing the combustion chamber to an opposite wall of the cylinder head body. These recesses partially penetrate one or more of the oil and coolant channels.Appropriate sealing arrangements in the form of sleeves, into which the injector and ignition devices are inserted, prevent the oil and coolant from mixing together or entering the combustion chamber, and also prevent gases compressed by the piston from escaping through the recesses in the combustion chamber.

[0003] From DE 10 2011 001 231 A1 a sleeve for an internal combustion engine is known which is designed to receive a fuel injector and to be inserted into a receptacle of a cylinder head of the internal combustion engine.

[0004] US patent 2019 / 0379181 A1 discloses a spark plug with a cylindrical housing, a cylindrical insulator inserted into the housing interior, a center electrode and a ground electrode.

[0005] From FR 2 875 862 A1, a cylinder head is known with an injector bore into which an injector sleeve is inserted. The injector bore includes an upper cylindrical bearing surface into which the upper end of the injector sleeve is pressed.

[0006] The sleeve has an externally conical contact surface that is in contact with an internally conical contact surface of the cylinder head.

[0007] The present invention is based on the objective of proposing a cylinder head for an internal combustion engine with a combustion chamber which has an increased tightness relative to the combustion chamber.

[0008] The problem is solved by a cylinder head for an internal combustion engine with a combustion chamber, comprising: a base body with a combustion chamber wall for closing the combustion chamber of the internal combustion engine, wherein the base body has a recess that penetrates the combustion chamber wall with a first opening and comprises a contact section with a tapered inner contact surface; and a sealing sleeve that has a sealing section with a tapered outer sealing surface, wherein the sealing sleeve and the base body are clamped together in such a way that the contact surface and the sealing surface are in sealing contact, wherein at least one of the contact section and the sealing section is at least partially plastically deformed.

[0009] The contact between the mounting surface and the sealing surface thus forms a first seal between the base body and the sealing sleeve.

[0010] The cylinder head according to the invention has the advantage that, due to the at least partial plastic deformation of the mating section and / or sealing section caused by the clamping of the sealing sleeve and the base body, any potential leakage at the contact between the mating surface and the sealing section is eliminated. Furthermore, surface roughness, which can lead to settling effects and thus a loss of sealing effect during the cylinder head's service life, is eliminated by the plastic deformation of the mating section and / or sealing section as soon as the sealing sleeve is installed in the base body. The clamping force between the base body and the sealing sleeve therefore remains largely constant over the cylinder head's service life, and the sealing effect is permanently maintained.

[0011] The sealing sleeve can be made of one or more parts. Therefore, the sealing sleeve can also be referred to as a sealing sleeve assembly.

[0012] In one possible embodiment, the sealing sleeve can be made of a material with a lower Brinell hardness than the base body. In this case, at least the sealing section of the sealing sleeve is at least partially plastically deformed. The sealing sleeve can, in particular, be made of an unalloyed or low-alloy structural steel. This has the advantage over commonly used copper sleeves, for example, that the sealing sleeve does not creep even at very high temperatures, such as those that regularly occur near the combustion chamber wall of a cylinder head, so that the clamping force between the sealing sleeve and the base body, and the resulting sealing effect, are permanently maintained throughout the service life of the cylinder head.

[0013] In one possible embodiment, the base body can be made of a material with a lower Brinell hardness than the sealing sleeve. In this case, at least the contact section of the base body is at least partially plastically deformed. The base body can, in particular, be made of a cast material, for example, gray cast iron.

[0014] The sealing sleeve can accommodate an injector assembly or a spark plug assembly. The injector assembly or spark plug assembly can be inserted into the core of the sealing sleeve and clamped to it via a thread. A sealing compression and / or a sealing element can be provided between the injector assembly or spark plug assembly and the sealing sleeve by means of this clamping action.

[0015] In one possible embodiment of the cylinder head, the sealing sleeve can have an external thread that engages in an internal thread of the recess of the base body, so that the sealing sleeve and the base body are clamped together in such a way that the contact surface and the sealing surface are in sealing contact.

[0016] In another embodiment, the contact section can be internally conical and / or the sealing section externally conical. It is also possible for the contact surface to be internally conical and / or the sealing surface externally conical.

[0017] Furthermore, in one possible embodiment, the extent of the sealing section along a longitudinal axis of the recess can be smaller than the extent of the contact section. It is also possible for a contact area, where the contact surface and the sealing surface are in contact, to extend over a portion of the contact surface. This allows for high surface pressures, which on the one hand lead to simplified plastic deformation and on the other hand to an increased sealing effect.

[0018] In a further embodiment, the sealing sleeve can have a relief groove that connects to the sealing section at its narrower end. This prevents contact between the sealing sleeve and the cylinder head body outside the sealing area, between the contact surface and the sealing surface. The clamping force applied by the clamping of the sealing sleeve and the body is thus transferred within the sealing area between the sealing sleeve and the body. This increases the surface pressure acting in the contact area, resulting in both simplified plastic deformation and an improved sealing effect.

[0019] In one possible embodiment of the cylinder head, it comprises a cylinder head cover connected to the base body, such that an oil chamber is formed between the cylinder head cover and the base body, the recess penetrating an oil chamber wall of the base body with a second opening. In this case, the sealing sleeve can extend into the oil chamber.

[0020] In one possible embodiment, the recess can extend through a coolant channel of the base body. In this case, the contact section of the recess can be arranged between the first opening penetrating the combustion chamber wall and the coolant channel of the base body. The contact between the contact surface and the sealing surface thus forms a first seal that seals the coolant channel against the side of the combustion chamber wall.

[0021] Furthermore, a second seal and a third seal can be provided between the sealing sleeve and the base body, each arranged between the coolant channel and the second opening of the recess.

[0022] In another embodiment of the cylinder head, the cylinder head cover can include an insertion opening. In this case, the sealing sleeve can extend through the oil chamber and the insertion opening.

[0023] In one embodiment, the sealing sleeve can comprise a flange section via which the sealing sleeve is connected to the cylinder head cover, in particular clamped, such that the sealing sleeve is clamped to the base body in such a way that the first seal is formed between the contact surface and the sealing surface. In principle, it is therefore conceivable that the clamping force between the sealing sleeve and the base body is applied either by the clamping between the external thread of the sealing sleeve and the internal thread of the recess in the base body, or by clamping the sealing sleeve to the cylinder head cover via the flange section.Alternatively, it is also conceivable that the clamping force between the sealing sleeve and the base body is applied partly by the clamping force between the external thread of the sealing sleeve and the internal thread of the recess of the base body, and partly by the clamping force of the sealing sleeve with the cylinder head cover via the flange section.

[0024] The injector assembly or the spark plug assembly can be connected to the cylinder head cover, in particular clamped, together with the flange section, by means of clamping devices.

[0025] In another possible embodiment, the sealing sleeve can comprise a flange element with the flange section and a sleeve element with the sealing section, which interlock slidably in the direction of a longitudinal axis of the sealing sleeve, with a fourth seal being provided between the flange element and the sleeve element.

[0026] In one possible embodiment, the sealing sleeve can comprise a flange element and a sleeve element with the sealing section, which interlock slidably along a longitudinal axis of the sealing sleeve, wherein the flange element is formed as a single piece with the cylinder head cover. In other words, the flange element can be integrated into the cylinder head cover.

[0027] The problem underlying the invention is further solved by using a sealing sleeve for sealing a cylinder head, which has a recess in a base body with a contact section having an internally conical contact surface, against the combustion chamber of an internal combustion engine, wherein the sealing sleeve has a sealing section with an externally conical sealing surface having a cone angle that is smaller than a cone angle of the internally conical contact surface and the cone angle of the sealing surface of the sealing sleeve differs from the cone angle of the internally conical contact surface by at least 0.5 degrees and / or by a maximum of 5 degrees.

[0028] The use of the sealing sleeve according to the invention results in edge contact between the sealing surface and the contact surface during assembly, creating high local pressures that lead to plastic deformation of at least one of the contact section and the sealing section. This plastic deformation seals leakage points and levels out unevenness that could lead to losses in settling force, thus achieving a high and durable sealing effect.

[0029] In particular, the cone angle of the sealing surface of the sealing sleeve used differs by at least 1 degree from the cone angle of the internally conical contact surface. The cone angle of the sealing surface of the sealing sleeve used may differ by a maximum of 2 degrees from the cone angle of the internally conical contact surface.

[0030] The sealing sleeve used may also have one or more properties that were previously described in the context of the cylinder head.

[0031] Examples of implementation are explained below using the figure drawings.

[0032] This shows Figure 1 shows a cylinder head according to the invention in a first embodiment in a sectional view; Figure 2 shows an enlarged section of the Figure 1 Figure 3 shows a detailed view of the contact between the sealing surface of the sealing sleeve and the contact surface of the base body of the cylinder head. Figure 1 in the assembled state of the sealing sleeve; Figure 4 shows a detailed view of the contact between the sealing surface of the sealing sleeve and the contact surface of the base body of the cylinder head. Figure 1in the pre-assembled state of the sealing sleeve; Figure 5 a cylinder head according to the invention in a second embodiment in a sectional view; Figure 6 a cylinder head according to the invention in a third embodiment in a sectional view, and Figure 7 a cylinder head according to the invention in a fourth embodiment in a sectional view.

[0033] In the Figures 1 to 4 The following descriptions of the cylinder head 1, which comprises a base body 2 and a cylinder head cover 3, are shown. The cylinder head cover 3 is rigidly connected to the base body 2 by means of connecting elements not shown. The cylinder head cover 3 and the base body 2 enclose an oil chamber 4 in which a valve train with camshaft (not shown for clarity) is arranged.

[0034] The base body 2 has a combustion chamber wall 5, which can also be referred to as the flame deck. Opposite the combustion chamber wall 5 and oriented towards the cylinder head cover 3, the base body 2 has an oil chamber wall 6.

[0035] The base body 2 is made of a cast material, with an inlet port 7 and an outlet port 8 cast into the base body 2. The inlet port 7 and the outlet port 8 each penetrate the combustion chamber wall 5. The inlet and outlet thus formed in the combustion chamber wall 5 can be selectively closed or opened by an inlet valve arrangement 9 and an outlet valve arrangement 10, respectively, in a manner known to those skilled in the art. In this case, the longitudinal axis of the inlet valve arrangement 9 is arranged parallel to the longitudinal axis of the outlet valve arrangement 10. It is understood that the longitudinal axes of the inlet valve arrangement 9 and the outlet valve arrangement 10 can also be arranged at an angle to each other.

[0036] Furthermore, the base body 2 has a recess 11, which in this case is designed in the form of a bore. It is understood that the recess 11 could alternatively also be cast directly into the base body 2. The recess 11 penetrates the combustion chamber wall 5 with a first opening 12 and the oil chamber wall 6 with a second opening 13. The recess 11 thus extends through the base body 2 from the first opening 12 to the second opening 13. In doing so, the recess 11 penetrates a coolant channel 14, through which coolant can flow to cool the cylinder head 1.

[0037] A sealing sleeve 15 is inserted into the recess 11 to seal the oil chamber 4 and the coolant channel 14 against the side of the combustion chamber wall 5. The sealing sleeve 15 extends through the recess 11 into the oil chamber 4 and from there through the cylinder head cover 3. The longitudinal axis of the sealing sleeve 15 is parallel to the longitudinal axes of the intake valve assembly 9 and the exhaust valve assembly 10.

[0038] The sealing sleeve 15 has a sealing section 16 with a tapered sealing surface 17. The sealing surface 17 thus extends along the longitudinal axis of the sealing sleeve 15 towards the combustion chamber wall 5 with gradually decreasing diameters. At the narrow end of the sealing section 16, a shoulder 20 in the form of a relief groove adjoins the sealing section 16. At the wide end of the sealing section 16, a shoulder 40 adjoins the sealing section 16, which is cylindrical with respect to the longitudinal axis. Alternatively, the shoulder 40 can be tapered towards the sealing section 16. The shoulder 40 and the sealing section 16 together form an outwardly convex surface of the sealing sleeve 15.

[0039] The recess 11 has a section 18 with a similarly tapered contact surface 19. The sealing surface 17 and the contact surface 19 are in a sealing contact area relative to each other. Furthermore, the tapered design ensures that the sealing sleeve 15 is centered in the recess 11.

[0040] The sealing section 16 has an extent H16 with respect to the longitudinal axis of the recess 11, which is smaller than the extent H18 of the contact section 18. As a result, the contact area in which the sealing surface 17 and the contact surface 19 are in contact extends over a partial area of ​​the contact surface 19. This prevents the sealing sleeve 15 from jamming in the recess 11.

[0041] The sealing sleeve 15 has an external thread 34 at one end facing the combustion chamber wall 5, which is screwed into an internal thread 35 provided in the recess 11 and clamped by it. In this case, the internal thread 35 is provided in the recess 11 between the combustion chamber wall 5 and the coolant channel 14. It is understood that the internal thread can also be provided at another location in the recess 11. For example, the internal thread can be located in the area of ​​the recess 11 that lies between the coolant channel 14 and the second opening 13. The clamping force applied by the screwing together of the external thread 34 and the internal thread 35 is supported in the contact area between the sealing surface 17 and the bearing surface 19. The clamping force is chosen such that at least one of the sealing section 16 of the sealing sleeve 15 and the mounting section 18 of the base body 2 is plastically deformed by the clamping force.The sealing sleeve 15 is made of a steel with a lower Brinell hardness than the material of the base body 2. Therefore, the sealing section 16 of the sealing sleeve 15 deforms plastically, while the contact section 18 of the base body 2 deforms elastically. It is understood that, alternatively, the sealing sleeve 15 can be made of a material with a higher Brinell hardness than the material of the base body, so that the contact section 18 of the base body 2 would then deform plastically, while the sealing section 16 of the sealing sleeve 15 would deform elastically. In principle, it is also conceivable that both the sealing section 16 and the contact section 18 could deform plastically.

[0042] The plastic deformation of at least one of the sealing section 16 of the sealing sleeve 15 and the contact section 18 of the base body 2 by the clamping force fills potential leakage points with the plastically deformed material and smooths out surface roughness that could lead to settling losses during cylinder head operation. Overall, this results in a high sealing effect between the sealing sleeve 15 and the base body 2 throughout the entire service life of the cylinder head 1.

[0043] The Figures 1 to 3 Each figure shows the state of the cylinder head 1 with the sealing sleeve 15 fully assembled, whose sealing section 16 is plastically deformed. In the pre-assembled state, which is shown in Figure 4As shown, the sealing section 16 has an externally conical shape and the contact section 18 has an internally conical shape. The cone angle of the sealing section 16 is smaller than the cone angle of the contact section 18. In this case, the cone angle of the sealing section 16 is 2 degrees smaller than the cone angle of the contact section 18. However, it is also conceivable that the cone angle of the sealing section 16 could be between 1 and 10 degrees smaller than the cone angle of the contact section 18. When the sealing sleeve 15 is inserted into the recess 11, the circumferential edge 21, formed by the sealing surface 17 and the shoulder 20 in the form of the relief groove, initially makes line contact. Applying the clamping force thus creates very high pressures in the area of ​​the edge 21, leading to plastic deformation of the softer component of the sealing sleeve 15 and the base body 2.The softer component is flattened by plastic deformation, so that the line contact transitions into a surface contact between sealing surface 17 and contact surface 19. Thus, by using a sealing sleeve with a smaller cone angle of the sealing section compared to the cone angle of the contact section, the clamping force required to achieve plastic deformation is reduced.

[0044] Between the coolant channel 14 and the second opening 13, the recess 11 has a first cylindrical section 22 and a second cylindrical section 23, which have different diameters. In the area of ​​the first cylindrical section 22, a second seal 36 in the form of an O-ring is arranged between the sealing sleeve 15 and the base body 2. In the area of ​​the second cylindrical section 23, a third seal 37 in the form of an O-ring is arranged between the sealing sleeve 15 and the base body 2. The second seal 36 and the third seal 37 together form a sealing assembly that seals the side of the combustion chamber wall 5 and the coolant channel 14 against the oil chamber 4.

[0045] The sealing sleeve 15 is designed in two parts and comprises a flange element 24 and a sleeve element 25. Therefore, the sealing sleeve 15 can also be referred to as a sealing sleeve assembly. The sleeve element 25 is seated in the recess 11 and extends into the oil chamber 4. The sleeve element 25 includes the sealing section 16 and the external thread 34. The sleeve element 25 is inserted into the flange element 24 so that it is axially displaceable along the longitudinal axis of the sealing sleeve 15, forming an axial overlap between the sleeve element 25 and the flange element 24. A fourth seal 38, in the form of an O-ring, is provided in this overlap area between the sleeve element 25 and the flange element 24, sealing the oil chamber 4 against the core of the sealing sleeve 15.

[0046] The flange element 24 is inserted into a recess 26 of the cylinder head cover 3. The flange element 24 has a flange section 27 which is clamped to the cylinder head cover 3 by means of clamping devices 28, 28'. A fifth seal 39 in the form of an O-ring is arranged between the flange element 24 and the recess 26 of the cylinder head cover 3 to seal the oil chamber 4 against the outside of the cylinder head cover 3.

[0047] The division of the sealing sleeve 15 into the flange element 24 and the sleeve element 25, and their axially displaceable arrangement relative to each other, enables simple assembly of the sealing sleeve 15 in the cylinder head 1. First, the sleeve element 25 is screwed into the recess 11 of the base body 2. After the cylinder head cover 3 has been mounted on the base body 2, the flange element 24 can be slid onto the oil-chamber-side end of the sleeve element 25 and subsequently clamped against the cylinder head cover 3 using the clamping devices 28. In the first embodiment of the cylinder head, the clamping force between the contact surface and the sealing surface thus results from the clamping of the screw connection between the sealing sleeve and the base body.

[0048] In this example, a spark plug 31 and a spark plug connector 32 of an ignition assembly 30 are inserted into the sealing sleeve 15. The spark plug 31 is screwed into the sealing sleeve, creating a sealing pressure between the spark plug 31 and the sealing sleeve 15. Alternatively or in combination with this, sealing elements can be provided between the spark plug 31 and the sealing sleeve 15.

[0049] The ignition arrangement 30 further comprises an ignition coil head 29, which is mounted on the spark plug connector 32 and protrudes from the sealing sleeve 15. The ignition coil head 29 is clamped against the cylinder head cover 3 and the flange element 24 by means of a clamping device 28', wherein a spacer sleeve 33 is arranged between the ignition coil head 29 and the flange element 24, through which the clamping device 28' is guided.

[0050] Alternatively, an injector assembly can be inserted into the sealing sleeve 15 instead of the ignition assembly 30. The injector assembly can be fastened using the clamping means 28' in the same way as the ignition assembly 30.

[0051] Figure 5 Figure 1 shows a cylinder head 1 according to the invention in a second embodiment. This corresponds in large part to the first embodiment, so reference is made to the description above regarding the similarities. Identical or modified components are provided with the same reference numerals as in the Figures 1 to 4The second embodiment of the cylinder head 1 differs from the first embodiment essentially in the one-piece construction of the sealing sleeve 15'. To apply the clamping force acting between the base body 2 and the sealing sleeve 15', the sealing sleeve 15' is first screwed into the internal thread 35 with its external thread 34 until the clamping force acting between the sealing surface 17 and the contact surface 19, which can also be referred to as the sealing force, reaches a first level. Subsequently, the clamping means 28 are clamped between the flange section 27 of the sealing sleeve 15' until the clamping force reaches the desired level and at least one of the sealing section and the contact section is plastically deformed. As in Figure 5 As can be seen, an axial distance A can be provided between the flange section 27 and the cylinder head cover 3 in the assembled state.

[0052] In Figure 6A cylinder head 1 according to the invention is shown in a third embodiment. This corresponds in large part to the second embodiment, so reference is made to the above description regarding the similarities. Identical or modified components are provided with the same reference numeral as in Figure 5 The third embodiment of the cylinder head 1 differs from the second embodiment essentially by the absence of the external thread 34 in the sealing sleeve 15" and the internal thread 35 in the recess 11. In this case, the clamping force acting between the base body 2 and the sealing sleeve 15 is applied solely via the clamping means 28, which are arranged under preload between the cylinder head cover 3 and the flange section 27.

[0053] Figure 7Figure 1 shows a cylinder head 1 according to the invention in a fourth embodiment. This corresponds in large part to the first embodiment, so reference is made to the description above regarding the similarities. Identical or modified components are provided with the same reference numerals as in the Figures 1 to 4The fourth embodiment of the cylinder head 1 differs from the first embodiment essentially in the integration of the flange element 24 into the cylinder head cover 3. In this case, the flange element 24 is integrally manufactured with the rest of the cylinder head cover 3 in a casting process. To apply the clamping force acting between the base body 2 and the sealing sleeve 15, the sleeve element 25 with its external thread 34 is screwed into the internal thread 35 until the clamping force acting between the sealing surface 17 and the contact surface 19, which can also be referred to as the sealing force, reaches the desired level and at least one of the sealing section and the contact section is plastically deformed.Subsequently, the cylinder head cover 3 is placed on the base body 2 in such a way that the sleeve element 25 is seated in the flange element 24, and is then firmly connected to the base body 2 via connecting means not shown. Reference symbol list

[0054] 1 Cylinder head 2 Base body 3 Cylinder head cover 4 Oil chamber 5 Combustion chamber wall 6 Oil chamber wall 7 Intake port 8 Exhaust port 9 Intake valve assembly 10 Exhaust valve assembly 11 Recess 12 Opening 13 Opening 14 Coolant channel 15, 15', 15'', 15‴ Sealing sleeve 16 Sealing section 17 Sealing surface 18 Mounting section 19 Mounting surface 20 Recess 21 Edge 22 Cylindrical section 23 Cylindrical section 24 Flange element 25 Sleeve element 26 Insertion opening 27 Flange section 28, 28' Clamping device 29 Ignition coil head 30 Ignition assembly 31 Spark plug 32 Spark plug connector 33 Spacer sleeve 34 External thread 35 Internal thread 36 Gasket 37 Seal 38 Seal 39 Seal 40 Paragraph Distance H height

Claims

1. Cylinder head for an internal combustion engine with a combustion chamber, comprising: - a main body (2) with a combustion-chamber wall (5) for closing off the combustion chamber of the internal combustion engine, wherein the main body (2) has a cutout (11) which extends through the combustion-chamber wall (5) by way of a first opening (12) and which comprises an abutment section (18) with a tapering internal abutment surface (19); and - a sealing sleeve (15) which has a sealing section (16) with a tapering external sealing surface (17), wherein the sealing sleeve (15) and the main body (2) are braced together in such a way that the abutment surface (19) and the sealing surface (17) are sealingly in abutment, characterized in that at least one of the abutment section (18) and the sealing section (16) is at least partially plastically deformed.

2. Cylinder head according to Claim 1, characterized in that the sealing sleeve (15) has an external thread (34) which engages into an internal thread (35) of the cutout (11) of the main body (2) so that the sealing sleeve (15) and the main body (2) are braced together in such a way that the abutment surface (19) and the sealing surface (17) are sealingly in abutment.

3. Cylinder head according to either of Claims 1 and 2, characterized in that an extent (H16) of the sealing section (16) in relation to a longitudinal axis of the cutout (11) is smaller than an extent (H18) of the abutment section (18).

4. Cylinder head according to one of Claims 1 to 3, characterized in that the sealing sleeve (15) has a shoulder (20) in the form of a recess, which adjoins the sealing section (16) at the narrower end thereof.

5. Cylinder head according to one of Claims 1 to 4, characterized by a cylinder-head cover (3) which is connected to the main body (2) so that an oil chamber (4) is formed between the cylinder-head cover (3) and the main body (2), wherein the cutout (11) extends through an oil-chamber wall (6), directed towards the oil chamber, of the main body (2) by way of a second opening (13) and the sealing sleeve (15) extends into the oil chamber (4).

6. Cylinder head according to one of Claims 1 to 5, characterized in that the cutout (11) extends through a coolant channel (14) of the main body (2).

7. Cylinder head according to Claim 6, characterized in that the abutment section (18) of the cutout (11) is arranged between the first opening (12) that extends through the combustion-chamber wall (5) and the coolant channel of the main body (2).

8. Cylinder head according to either of Claims 6 and 7, characterized in that provision is made between the sealing sleeve (15) and the main body (2) of a second seal (36) and a third seal (37), each of which is arranged between the coolant channel (14) and the second opening (13) of the cutout (11).

9. Cylinder head according to one of Claims 5 to 8, characterized in that the cylinder-head cover (3) comprises a plug-in opening (26), wherein the sealing sleeve (15) extends through the oil chamber and the plug-in opening (26).

10. Cylinder head according to one of Claims 5 to 9, characterized in that the sealing sleeve (15) comprises a flange section (27), via which the sealing sleeve (15) is connected to the cylinder-head cover (3) so that the sealing sleeve (15) is braced with the main body (2) in such a way that the abutment surface (19) and the sealing surface (17) are sealingly in abutment.

11. Cylinder head according to Claim 10, characterized in that an injector arrangement or an ignition-plug arrangement (30) is accommodated in the sealing sleeve (15), wherein the injector arrangement or the ignition-plug arrangement is connected to the cylinder-head cover (3) together with the flange section (27) via clamping means (28).

12. Cylinder head according to either of Claims 10 and 11, characterized in that the sealing sleeve (15) comprises a flange element (24) with the flange section (27) and comprises a sleeve element (25) with the sealing section (16), which engage into one another in a manner displaceable in the direction of a longitudinal axis of the sealing sleeve (15), wherein a fourth seal is provided between the flange element (24) and the sleeve element (25).

13. Cylinder head according to one of Claims 5 to 8, characterized in that the sealing sleeve (15) comprises a flange element (24) and a sleeve element (25) with the sealing section (16), which engage into one another in a manner displaceable in the direction of a longitudinal axis of the sealing sleeve (15), wherein the flange element (24) is formed in one piece with the cylinder-head cover (3).

14. Use of a sealing sleeve (15) for sealing off a cylinder head (1), which has in a main body (2) a cutout (11) with an abutment section (18) with an internally conical abutment surface (19), in relation to the combustion chamber of an internal combustion engine, wherein the sealing sleeve (15) has an externally conical sealing surface (17) with a cone angle which is smaller than a cone angle of the internally conical abutment surface (19), and the cone angle of the sealing surface (17) of the sealing sleeve (15) differs from the cone angle of the internally conical abutment surface by at least 0.5 degrees and / or by at most 5 degrees.

Images