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

Abstract

A cylinder head for an internal combustion engine with a combustion chamber and use of a sealing sleeve for sealing the cylinder head. The invention relates to a sealing sleeve (15) having a base body (2) with a combustion chamber wall (5) for closing the combustion chamber of an internal combustion engine, and a sealing sleeve (15) having a sealing portion (16) with a tapered outer sealing surface (17), said recess (11) entering the combustion chamber wall (5) at a first opening (12) and having a contact portion (18) with a tapered inner contact surface (19), the sealing sleeve (15) and the base body (2) are in sealing contact with each other at the contact surface (19) and the sealing surface (17), and at least one of the contact portion (18) and the sealing portion (16) is at least partially plastically deformed.

Description

[Technical field]

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

[0002] The cylinder head closes the combustion chamber of the internal combustion engine opposite the piston. It integrates inlet and outlet passages, as well as oil and coolant passages for lubricating the moving mechanical parts. It also supports the valves, the valve train, the injectors and the ignition. The injectors and ignition are arranged in recesses that extend through the cylinder head base from the combustion chamber wall facing the combustion chamber to the opposite wall of the cylinder head base. The recesses are partially inserted into one or more oil and coolant passages. A suitable sealing structure in the form of a sleeve, into which the injectors and ignition are inserted, prevents the oil and coolant from entering and mixing in the combustion chamber and also prevents the gases compressed by the piston from leaking through the recesses into the combustion chamber.

[0003] German Patent Publication DE 10 2011 001 231 A1 describes a sleeve for an internal combustion engine that is designed to accommodate a fuel injector, which is inserted into a receptacle in the cylinder head of the engine. The sleeve has an outer conical contact surface that contacts an inner conical contact surface of the cylinder head. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] German Patent Publication No. DE102011001231A1 Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE DISCLOSURE An object of the present invention is to propose a cylinder head for an internal combustion engine having a combustion chamber, which improves the airtightness of the combustion chamber. [Means for solving the problem]

[0006] In order to achieve the above object, the cylinder head of an internal combustion engine of the present invention comprises a base body having a combustion chamber wall for closing a combustion chamber of an internal combustion engine, and a sealing sleeve having a tapered outer sealing surface, the base body having a recess leading to the wall combustion chamber at a first opening and a contact portion having a tapered inner contact surface, the base body and the sealing sleeve are clamped together to form a first seal between the base body and the sealing sleeve by contact between the contact surface and the sealing surface, and at least one of the contact portion and the sealing portion is at least partially plastically deformed.

[0007] Contact between the contact surface and the seal surface forms a first seal between the base and the seal sleeve.

[0008] The cylinder head according to the invention has the advantage that the contact and / or seal parts are at least partially plastically deformed by clamping the sealing sleeve and the base body, thereby eliminating the possibility of leakage at the contact parts between the contact surfaces and the seal parts. Furthermore, the contact and seal parts are plastically deformed when the sealing sleeve is attached to the base body, which eliminates surface roughness that would otherwise cause settling, which would cause the sealing effect to be lost during the service life of the cylinder head. The clamping force between the base body and the sealing sleeve ensures that the sealing effect remains almost constant and permanent over the entire service life of the cylinder head.

[0009] The sealing sleeve can be made of one or more components - in this respect it is also called a sealing sleeve construction (Dichth·lsenanordnung).

[0010] In one possible embodiment, the sealing sleeve can be made of a material with a lower Brinell hardness than the substrate. In this case, at least the sealing portion of the sealing sleeve is at least partially plastically deformed. In particular, the sealing sleeve can be made of unalloyed or low-alloyed structural steel. This has the advantage, in comparison with the commonly used copper sleeves, that the sealing sleeve is not subject to creep, for example even at very high temperatures, which creep regularly occurs in the cylinder head, especially in the vicinity of the combustion chamber wall. The resulting sealing effect between the sealing sleeve and the substrate is maintained permanently throughout the entire service life of the cylinder head.

[0011] In one possible embodiment, the substrate can be made of a material having a lower Brinell hardness than the sealing sleeve, in which case at least the contact portion of the substrate is at least partially plastically deformed. In particular, the substrate can be made of a cast material, for example grey cast iron.

[0012] An injector arrangement or a spark plug arrangement can be accommodated in the sealing sleeve. These injector arrangements or spark plug arrangements can be inserted into the core of the sealing sleeve and clamped thereto via a thread. A clamping force and / or a sealing pressure due to a sealing element is provided between the injector arrangement or the spark plug arrangement and the sealing sleeve.

[0013] In one possible embodiment of the cylinder head, the sealing sleeve can have male threads that engage with the female threads of the recess in the base, and can contact the base when clamped such that the contact surfaces and the sealing surface are in sealing contact with each other.

[0014] In yet another embodiment, the contact portion can be conical on the inside and / or the seal portion can be conical on the outside. It is also possible for the contact surface to be conical on the inside and / or the seal surface to be conical on the outside.

[0015] In yet another possible embodiment, the extension of the sealing part relative to the longitudinal axis of the recess can be smaller than the extension of the contact part, and the contact area between the contact surface and the sealing surface can extend beyond the contact surface, which allows a higher surface pressure to be achieved, which can be easily plastically deformed and improves the sealing effect.

[0016] In yet another embodiment, an undercut can be formed at the narrow end of the sealing sleeve, which connects to the sealing portion. This prevents contact between the sealing sleeve and the cylinder head base body except for the sealing contact between the contact surface and the sealing surface. Thus, the clamping force applied by the tension of the sealing sleeve and the base body can be transferred to the sealing contact area between the sealing sleeve and the base body. This means that the surface pressure acting on the contact area can be increased, which makes the plastic deformation easier and increases the sealing effect.

[0017] In yet another possible embodiment of the cylinder head, the cylinder head comprises a cylinder head cover, which is connected to the base body, and an oil space is formed between the cylinder head cover and the base body, the recess enters the oil space wall of the base body at the second opening, and the sealing sleeve can extend into the oil chamber in this case.

[0018] In yet another possible embodiment, the recess can extend through the coolant passage in the base, in which case the contact surface of the recess can be located between the first opening through the combustion chamber wall and the coolant passage in the base, such that contact between the contact surface and the sealing surface forms a first seal that seals the coolant passage from the combustion chamber wall.

[0019] Additionally, a second seal and a third seal may be provided between the sealing sleeve and the base, each disposed between the coolant passage and the second opening of the recess.

[0020] In a further embodiment of the cylinder head, the cylinder head cover may comprise an insertion opening, in which case the sealing sleeve may extend through the oil chamber and the insertion opening.

[0021] In one embodiment, the sealing sleeve can include a flange portion, via which the sealing sleeve is connected, in particular clamped, to the cylinder head cover, i.e. the sealing sleeve is clamped to the base and a first seal is formed between the contact surface and the sealing surface. In principle, it is conceivable that the fastening force (clamping force) between the sealing sleeve and the base is provided by fastening between the male thread of the sealing sleeve and the female thread of the recess in the base, or by clamping the cylinder head cover to the sealing sleeve via the flange portion. Alternatively, it is also conceivable that the clamping force between the sealing sleeve and the base is partially provided by the clamping force between the male thread of the sealing sleeve and the female thread of the recess in the base, and partially provided by the clamping force of the cylinder head cover to the sealing sleeve via the flange portion.

[0022] The injector arrangement or the spark plug arrangement can be connected, in particular clamped, with the flange portion to the cylinder head cover via clamping means.

[0023] In yet another possible embodiment, the sealing sleeve can include a flange element having a flange portion and a sleeve element having a sealing portion that are displaceably engaged with one another along the longitudinal axis of the sealing sleeve to provide a fourth seal between the flange element and the sleeve element.

[0024] In yet another possible embodiment, the sealing sleeve can have a flange element and a sleeve element with a sealing portion, which engage with each other displaceably in the longitudinal axis direction of the sealing sleeve. The flange element can be designed integrally with the cylinder head cover, in other words, the flange element and the cylinder head cover can be integrated.

[0025] The object of the present invention is further achieved by sealing a cylinder head using a sealing sleeve having a base body having a recess with a contact portion having an inner conical contact surface with respect to a combustion chamber of an internal combustion engine, the sealing portion having an outer conical sealing surface having a cone angle smaller than the cone angle of the inner conical contact surface.

[0026] The use of the sealing sleeve according to the present invention firstly provides edge support between the sealing surface and the contact surface during assembly, which results in localized high pressure and plastic deformation of at least one of the contact and sealing parts, which seals the leak points and flattens the unevenness that leads to a reduction in the setting force, thus maintaining a high sealing effect for a long time.

[0027] In particular, the cone angle of the sealing surface of the sealing sleeve is used which differs from the cone angle of the inner conical contact surface by at least 0.5 degrees, in particular by at least 1 degree. The cone angle of the sealing surface of the sealing sleeve used can differ from the cone angle of the inner conical contact surface by at most 5 degrees, in particular by at most 2 degrees.

[0028] With respect to the cylinder head, the sealing sleeve used may have one or more of the characteristics described above. Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings. [Brief description of the drawings]

[0029] [Figure 1] 1 is a cross-sectional view of a cylinder head according to a first embodiment of the present invention. [Diagram 2] Enlarged detailed view of (Figure 1). [Diagram 3]FIG. 2 is a detailed view of the contact between the sealing surface of the sealing sleeve of FIG. 1 and the contact surface of the base body of the cylinder head when the sealing sleeve is assembled. [Figure 4] FIG. 2 is a detailed view of the contact between the sealing surface of the sealing sleeve of FIG. 1 and the contact surface of the base body of the cylinder head before the sealing sleeve is assembled. [Diagram 5] FIG. 4 is a cross-sectional view of a cylinder head according to a second embodiment of the present invention. [Figure 6] FIG. 7 is a cross-sectional view of a cylinder head according to a third embodiment of the present invention. [Figure 7] FIG. 11 is a cross-sectional view of a cylinder head according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] The following will explain Figures 1 to 4 together. These figures show a cylinder head 1 including a base body 2 and a cylinder head cover 3. The cylinder head cover 3 is firmly connected to the base body 2 via connecting means (not shown). The cylinder head cover 3 and the base body 2 surround an oil chamber 4 in which a valve train with a camshaft (not shown for clarity) is located.

[0031] The base body 2 has a combustion chamber wall 5, also called the frame deck, and on the opposite side to the combustion chamber wall 5, an oil chamber wall 6 facing towards the cylinder head cover 3.

[0032] The base body 2 is made of a cast part, into which an inlet passage 7 and an outlet passage 8 are cast. The inlet passage 7 and the outlet passage 8 each pass through the combustion chamber wall 5. These inlet passages 7 and outlet passages formed in the combustion chamber wall 5 can be opened and closed by an inlet valve device 9 or an outlet valve device 10 in a manner known to those skilled in the art. In the illustrated example, the longitudinal axis of the inlet valve device 9 is arranged parallel to the longitudinal axis of the outlet valve device 10. However, the longitudinal axes of the inlet valve device 9 and the outer valve device 10 can also be arranged obliquely to each other.

[0033] The base body 2 further has a recess 11. In the illustrated example, this recess 11 is designed in the form of a bore. Alternatively, it is clear that the recess 11 can also be cast directly into the base body 2. The recess 11 enters the combustion chamber wall 5 at a first opening 12 and enters the oil chamber wall 6 at a second opening 13. The recess 11 therefore runs through the base body 2 from the first opening 12 to the second opening 13. In the illustrated example, the recess 11 enters a cooling water channel 14, through which cooling water flows for cooling the cylinder head 1.

[0034] A sealing sleeve 15 is inserted into the recess 11 to seal the oil chamber 4 and the cooling water passage 14 from the combustion chamber wall 5. This 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 inlet valve arrangement 9 and the outlet valve arrangement 10. will be done.

[0035] The sealing sleeve 15 has a sealing portion 16 with a tapered sealing surface 17 which extends along the longitudinal axis of the sealing sleeve 15 in the direction of the combustion chamber wall 5 with a gradually decreasing diameter. At the narrow end of the sealing portion 16 there is a step 20 in the form of an undercut. At the wide end of the sealing portion 16 there is a shoulder 40 which is cylindrical with respect to the longitudinal axis. Alternatively, the shoulder 40 may taper towards the sealing portion 16. The shoulder 40 and the sealing portion 16 together form an outwardly curved surface of the sealing sleeve 15.

[0036] The recess 11 has a contact portion 18 with a tapered contact surface 19. The sealing surface 17 and the contact surface 19 make sealing contact with each other at the contact area. The contact of the tapered surfaces ensures that the sealing sleeve 15 is centered in the recess 11.

[0037] The sealing portion 16 has an extension H16 relative to the longitudinal axis of the recess 11, which is smaller than the extension H18 of the contact portion 18. As a result, the contact area where the sealing surface 17 meets the contact surface 19 is small and extends over a portion of the contact surface 19. This prevents the sealing sleeve 15 from becoming stuck in the recess 11.

[0038] The sealing sleeve 15 has an external thread 34 at its end facing the combustion chamber wall 5, which is screwed and tightened into an internal thread 35 formed in the recess 11. This internal thread 35 is formed in the recess 11 between the combustion chamber wall 5 and the coolant passage 14. It goes without saying that the internal thread 35 can be located at another position in the recess 11. For example, the internal thread can be arranged in the region of the recess 11 between the coolant passage 14 and the second opening 13. The clamping force exerted by screwing the external thread 34 and the internal thread 35 is supported in the contact area between the sealing surface 17 and the contact surface 19. The support force in this case is selected such that at least one of the sealing part 16 of the sealing sleeve 15 and the contact part 18 of the base body 2 is plastically deformed by the support force. The sealing sleeve 15 is made of steel having a lower Brinell hardness than the material of the base body 2. As a result, the sealing part 16 of the sealing sleeve 15 is plastically deformed and the contact part 18 of the base body 2 is elastically deformed. It goes without saying that, alternatively, the sealing sleeve 15 can be made of a material having a higher Brinell hardness than the material of the substrate. In this case, the contact portion 18 of the substrate 2 undergoes plastic deformation, the sealing portion undergoes plastic deformation, and the sealing sleeve 15 undergoes elastic deformation. In principle, it is also conceivable that both the sealing portion 16 and the contact portion 18 undergo plastic deformation.

[0039] Due to the above-mentioned plastic deformation of the sealing portion 16 of the sealing sleeve 15 and / or the contact portion 18 of the base body 2, potential leak points are filled with plastically deformed material and uneven surfaces which cause loss of set during operation of the cylinder head are smoothed out, thus resulting in a high sealing effect between the sealing sleeve 15 and the base body 2 throughout the entire life cycle of the cylinder head 1 as a whole.

[0040] 1-3 show the assembled state of the sealing sleeve 15 of the cylinder head 1, with the sealing part 16 being plastically deformed. FIG. 4 shows the state before assembly, with the sealing part 16 having an outer conical shape and the contact part 18 having an inner conical shape. The cone angle of the sealing part 16 is smaller than that of the contact part 18. In this case, the cone angle of the sealing part 16 is 2 degrees smaller than that of the contact part 18. In principle, however, it is conceivable that the cone angle of the sealing part 16 is 1 to 10 degrees smaller than that of the contact part 18. When the sealing sleeve 15 is inserted into the recess 11, initially a line contact is made between the sealing surface 17 and the rim 21 formed by the shoulder 20 in the form of an undercut. The application of a clamping force generates very high pressures in the region of said rim 21, which leads to plastic deformation of the sealing sleeve 15 and the softer components of the base body 2. This plastic deformation flattens the soft portion, and the line contact changes to surface contact between the seal surface 17 and the contact surface 19. In other words, by using a seal sleeve with a small cone angle of the seal portion compared to the cone angle of the contact portion, the clamping force required to cause the plastic deformation can be reduced.

[0041] The recess 11 has a first cylindrical part 22 and a second cylindrical part 23 with different diameters between the coolant passage 14 and the second opening 13. In the region of the first cylindrical part 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 region of the second cylindrical part 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 thus constitute a seal for sealing the side of the combustion chamber wall 5 and the coolant passage 14 from the oil chamber 4.

[0042] In the illustrated example, the sealing sleeve 15 is designed in two parts, consisting of a flange element 24 and a sleeve element 25. In this respect, the sealing sleeve 15 is also called a sealing sleeve arrangement. The sleeve element 25 is located in the recess 11 and extends into the oil chamber 4. The sleeve element 25 comprises the sealing part 16 and an external thread 34. The sleeve element 25 is inserted into the flange element 24 and is axially displaceable in the axial longitudinal direction of the sealing sleeve 15. An axial overlap area is thus formed between the sleeve element 25 and the flange element 24. In this overlap area, a fourth seal 38 in the form of an O-ring is provided between the sleeve element 25 and the flange element 24, sealing the oil space 4 from the core of the sealing sleeve 15.

[0043] The flange element 24 is located within the insertion opening 26 of the cylinder head cover 3. The flange element 24 has a flange portion 27 that is clamped to the cylinder head cover 3 via clamping means 28, 28'. A fifth seal 39 made of an O-ring is disposed between the flange element 24 and the insertion opening 26 of the cylinder head cover 3 to seal the oil chamber 4 from the outside of the cylinder head cover 3.

[0044] The division of the sealing sleeve 15 into the flange element 24 and the sleeve element 25, which are arranged axially displaceable relative to one another, allows the sealing sleeve 15 to be easily assembled in the cylinder head 1. Firstly, the sleeve element 25 is screwed into the recess 11 in the base body 2. After the cylinder head cover 3 has been mounted on the base body 2, the flange element 24 can be pressed into the oil chamber end of the sleeve element 25 and subsequently clamped against the cylinder head cover 3 by the clamping means 28. In the first embodiment of the cylinder head, the clamping force between the contact and sealing surfaces is thus obtained by the screw connection between the sealing sleeve and the base body.

[0045] In this embodiment, the spark plug 31 and the spark plug connector 32 of the ignition device 30 are inserted into the sealing sleeve 15. The spark plug 31 is screwed into the sealing sleeve, so that a sealing pressure is established between the spark plug 31 and the sealing sleeve 15. Alternatively, or in combination, a sealing element can be provided between the spark plug 31 and the sealing sleeve 15.

[0046] The ignition device 30 is arranged on the spark plug connector 32 and includes an ignition coil head 29 protruding from the sealing sleeve 15. The ignition coil head 29 is clamped against the cylinder head cover 3 and the flange element 24 by clamping means 28', a spacer sleeve 33 being arranged between the ignition coil head 29 and the flange element 24, through which the clamping means 28' is guided.

[0047] Alternatively, instead of the ignition device 30, an injector device can be sealingly inserted into the sealing sleeve 15. The injector device can be fixed in a similar manner to the fixing of the ignition device 30 via clamping means 28'.

[0048] FIG. 5 shows a cylinder head 1 according to a second embodiment of the invention. This second embodiment corresponds mainly to the first embodiment, so that the above description is referred to for the similarities. The cylinder head 1 according to the second embodiment essentially differs from the first embodiment in that the sealing sleeve 15' is of one-piece construction. To apply the clamping force acting between the base body 2 and the sealing sleeve 15', the sealing sleeve 15' with the male thread 34 is first screwed into the female thread 35 until a clamping force acts between the sealing surface 17 and the contact surface. This is also called the sealing force, and can reach a first level. The clamping means 28 are then clamped between the flange portion 27 of the sealing sleeve 15 until the clamping force reaches a desired height and at least one of the sealing portion and the contact portion is plastically deformed. As can be seen from FIG. 5, an axial distance A can be provided between the flange portion 27 and the cylinder head cover 3 in the assembled state.

[0049] FIG. 6 shows a cylinder head 1 according to a third embodiment of the invention, which also corresponds mainly to the first embodiment, so that reference is made to the above description for similarities. Identical or modified components are given the same reference numbers as in FIG. 5. The cylinder head 1 according to the third embodiment has an external male thread on the sealing sleeve 15''. The second embodiment is essentially different from the second embodiment in that there is no internal female thread 35 in the recess 11 and no internal female thread 34 in the recess 11. In this case, the clamping force acting between the base body 2 and the sealing sleeve 15' is provided only by the clamping means 28 arranged between the cylinder head cover 3 and the flange portion 27.

[0050] FIG. 7 shows a cylinder head 1 according to a fourth embodiment of the invention. It also corresponds mainly to the first embodiment, so that reference is made to the above description for similarities. Identical or modified components are given the same reference numbers as in FIG. 1 - FIG. 4. The cylinder head 1 according to the fourth embodiment essentially differs from the first embodiment in that the flange element 24 is integrated into the cylinder head cover 3. The flange element 24 is manufactured in a casting process with the remaining part of the cylinder head cover 3. To apply a clamping force acting between the base body 2 and the sealing sleeve 15 ″, the sleeve element 25 with the external thread 34 is screwed into the internal thread 35 until a clamping force acts between the sealing surface 17 and the contact surface. The clamping force, also called the sealing force, is applied until the desired level is reached, until at least one of the sealing part 17 and the contact part 19 is plastically deformed. The cylinder head cover 3 is then placed on the base body 2 so that the sleeve element 25 fits into the flange element 24 and is rigidly connected to the base body 2 by means of connecting means not shown. [Explanation of symbols]

[0051] 1. Cylinder head 2 Base 3 Cylinder head cover 4. Oil Room 5 Combustion chamber wall 6 Oil chamber wall 7 Entrance Passage 8 Exit passage 9 Inlet valve device 10. Outlet valve device 11 Recess 12 aperture 13 Aperture 14 Cooling Channel 15, 15', 15'', 15'' Seal Sleeve 16 Seal part 17 Sealing surface 18 Contact part 19 Contact surface 20 Shoulder 21 Periphery 22 Cylindrical part 23 Cylindrical section 24 Flange elements 25 Sleeve element 26 Insertion port 27 Flange 28, 28' Clamping device 29 Ignition coil head 30 Ignition system 31 Spark plug 32 Spark plug cap 33 Spacer sleeve 34 Male thread 35 Female thread 36 Seal 37 Seal 38 Seal 39 Seal 40 Shoulder A Distance H Height

Claims

1. a base body (2) provided with a combustion chamber wall (5) for closing a combustion chamber of an internal combustion engine; a sealing sleeve (15) having a sealing portion (16) with a tapered outer sealing surface (17); a base body (2) having a recess (11) extending into a combustion chamber wall (5) at a first opening (12) and a contact portion (18) having a tapered inner contact surface (19), the sealing sleeve (15) and the base body (2) being clamped together such that the inner contact surface (19) and the outer sealing surface (17) are in sealing contact, A cylinder head characterized in that at least one of the contact portion (18) and the seal portion (16) is at least partially plastically deformed.

2. 2. The cylinder head according to claim 1, wherein the sealing sleeve (15) has a male thread (34) that engages with a female thread (35) of the recess (11) of the base body (2), and the contact surface (19) and the sealing surface (17) come into sealing contact when the sealing sleeve (15) and the base body (2) are clamped together.

3. 2. A cylinder head according to claim 1, wherein an extension (H16) of the sealing portion (16) relative to the longitudinal axis of the recess (11) is smaller than an extension (H18) of the contact portion (18).

4. 2. A cylinder head according to claim 1, wherein the narrow end of the sealing sleeve (15) has a shoulder (20) in the form of an undercut adjacent the sealing portion (16).

5. 2. A cylinder head according to claim 1, wherein when the cylinder head cover (3) is connected to the base body (2), an oil chamber (4) is formed between the cylinder head cover (3) and the base body (2), the recess (11) penetrates the oil chamber wall (6) of the base body (2) facing the oil chamber at the second opening (13), and the sealing sleeve (15) extends into the oil chamber (4).

6. 2. A cylinder head according to claim 1, wherein the recess (11) extends through a coolant passage (14) in the base body (2).

7. 7. A cylinder head according to claim 6, wherein the coolant flow passages of the base body are arranged between the first openings (12) penetrating the combustion chamber wall (5) and the contact portions (18) of the recesses (11).

8. 7. A cylinder head according to claim 6, wherein a second seal (36) and a third seal (37) are provided between the sealing sleeve (15) and the base body (2), each of which is provided between the coolant passage (14) and the second opening (13) of the recess (11).

9. 6. A cylinder head according to claim 5, wherein the cylinder head cover (3) comprises an insertion opening (26), and the sealing sleeve (15) extends through the oil chamber and said insertion opening (26).

10. 6. A cylinder head according to claim 5, wherein the sealing sleeve (15) comprises a flange portion (27) through which the sealing sleeve (15) is connected to the cylinder head cover (3), and the sealing sleeve (15) is clamped to the base body (2) so that the contact surface (19) and the sealing surface (17) are in sealing contact with each other.

11. 11. The cylinder head according to claim 10, wherein an injector device or a spark plug device (30) is housed in the seal sleeve (15), and the injector device or the spark plug device is connected to the cylinder head cover (3) together with the flange portion (27) by a clamping means (28). Connect

12. 11. A cylinder head according to claim 10, wherein the sealing sleeve (15) comprises a flange element (24) having a flange portion (27) and a sleeve element (25) having a sealing portion (16), which are connected to each other so as to be displaceable in the direction of the longitudinal axis of the sealing sleeve (15), and a fourth seal is arranged between the flange element (24) and the sleeve element (25).

13. 6. A cylinder head according to claim 5, wherein the sealing sleeve (15) comprises a flange element (24) with a sealing portion (16) and a sleeve element (25), which engage with each other displaceably in the direction of the longitudinal axis of the sealing sleeve (15), and the flange element (24) is designed integrally with the cylinder head cover (3).

14. 1. Use of a sealing sleeve (15) for sealing a cylinder head (1), the sealing sleeve (15) having a recess (11) with a contact portion (18) in a base body (2), the recess (11) having an inner conical contact surface (19) facing a combustion chamber of an internal combustion engine, the sealing sleeve (15) having an outer conical sealing surface (17) having a cone angle smaller than the cone angle of the inner conical contact surface (19).

Images