Projectile, in particular medium-calibre projectile for mobile and stationary air, marine and tank guns

Abstract

The invention relates to a projectile (10), in particular a medium-calibre projectile for mobile and stationary air, marine and tank guns, having: - a body (12), having: - a cavity (16) for receiving a payload, - a front portion (18) that has an opening leading to the cavity (16) and an annular end face (22) that extends coaxially to a longitudinal axis L of the projectile (10) and surrounds the opening, and - a first connecting element (20); - a hood (14), having: - a rear portion (26) that closes the opening of the body (12) and has an annular contact surface (30) that extends coaxially to the longitudinal axis L, and - a second connecting element (28) that engages releasably on the first connecting element (20) in such a way that the body (12) and the hood (14) are pressed against one another. In order to improve the sealing of the cavity (16) in such a projectile (10), it is provided that: - the end face (22) has a first, substantially funnel-shaped sealing surface (24) that extends with a first cone angle α about the longitudinal axis L; - the contact surface (30) has a second, substantially conical sealing surface (32), which extends with a second cone angle β about the longitudinal axis L; - the two cone angles α, β differ by a difference angle δ1 = β-α ≠ 0°; and - the two sealing surfaces (24, 32) lie against one another in a sealing manner via a substantially circular sealing point (34).

Description

[0001] "SHOOT, IN PARTICULAR MEDIUM CALIBER SHOT FOR MOBILE AND STATIONARY AIR, NAVAL AND TANK GUNS"

[0002] The invention relates to a projectile, in particular a medium-caliber projectile for mobile and stationary air, naval and tank guns.

[0003] In recent years, it has become clear that the active defense of close airspace with guns and the associated medium-caliber ammunition is a key element in securing vital air superiority in one's own territory. To effectively engage a flying target, the accuracy of medium-caliber projectiles across a wide temperature range is of paramount importance. Furthermore, moisture content interferes with the deployment of submunitions embedded in the projectile, which in turn negatively impacts accuracy.

[0004] A well-known disadvantage of all types of ammunition is its aging. However, resistance to aging is of great importance, as ammunition is typically stored for very long periods between procurement and use. For this reason, procurement agencies conduct extensive ammunition monitoring programs to ensure the operational readiness of ammunition in an emergency. These programs have demonstrated in recent years that protection against moisture is a key element for the longevity and safety of ammunition.

[0005] To meet these challenges, various systems have been developed, e.g. a one-piece construction of the projectile casing, in which there is only one interface between the casing and the projectile that needs to be sealed (cf. full metal jacket projectile).

[0006] EP 1 229 299 A2 discloses a thermosetting sealant that is inserted between an artillery shell casing and a fuze, which simultaneously forms the projectile tip of an artillery shell. This ensures that different fuzes can be screwed on and off, and that the inserted thermosetting material provides a reliable seal against dust and moisture.

[0007] A disadvantage of EP 1 229 299 A2 is that the thermosetting sealant has to be applied to the thread in a separate step and the sealant is a separate component that is prone to defects.

[0008] The invention is based on the objective of creating a projectile, in particular a medium-caliber projectile for mobile and stationary air and tank guns, in which the sealing of a cavity for receiving a payload, which in particular comprises subprojectiles and / or at least one explosive charge, is improved.

[0009] This problem is solved by the subject matter of claim 1. Advantageous embodiments of the invention are described in the dependent claims.

[0010] The invention proposes a projectile, in particular a medium-caliber projectile for mobile and stationary air and tank guns, comprising:

[0011] - having a body that is in particular rotationally symmetric:

[0012] - a cavity to accommodate a payload,

[0013] - a front section having an opening leading to the cavity and an annular end face that runs coaxially to a longitudinal axis of the projectile and surrounds the opening, and

[0014] - a first connecting element;

[0015] - a hood that is particularly rotationally symmetrical, having:

[0016] - a rear section that closes the opening of the body and has an annular contact surface that runs coaxially to the longitudinal axis, and

[0017] - a second connecting element that detachably engages the first connecting element in such a way that the body and the hood are pressed against each other; wherein

[0018] - the end face has a first, essentially funnel-shaped sealing surface which runs coaxially around the longitudinal axis with a first cone angle α;

[0019] - the mounting surface has a second, essentially conical sealing surface that runs coaxially around the longitudinal axis with a second cone angle β;

[0020] - the two cone angles a, ß differ by a difference angle θ1 = ß - a ≥ 0°; and

[0021] - the two sealing surfaces lie against each other via an essentially circular sealing point.

[0022] Since the two cone angles differ by the differential angle, the two sealing surfaces do not lie flat against each other, but rather touch at the essentially circular sealing point. There, the pressure generated by the connecting elements can advantageously be so high that the front section and / or the rear section deforms plastically or elastically in this area, thus achieving a very good seal. This has a positive effect on the maximum storage life.

[0023] If θ > 0°, then, according to a first alternative, either a radially outer edge of the first sealing surface forms an annular ridge extending from the front section or the end face, which abuts the contact surface to form a circular sealing point. Or, according to a second alternative, a radially outer edge of the second sealing surface forms an annular ridge extending from the rear section or the contact surface, which abuts the end face to form a circular sealing point. If θ < 0°, then, according to a first alternative, either a radially inner edge of the first sealing surface forms an annular ridge extending from the front section or the end face, which abuts the contact surface to form a circular sealing point.Or, according to a second alternative, a radially inner edge of the second sealing surface forms an annular ridge extending out from the rear section or the contact surface, which abuts the front surface to form a sealing circular sealing point.

[0024] The projectile can be designed in any way required, for example as a medium-caliber projectile for mobile and stationary air and tank guns, and / or in such a way that it has no additional cavity or at least one additional cavity. The payload can, in particular, consist of subprojectiles and / or at least one explosive charge.

[0025] The connecting elements can be designed in any desired way, for example, by forming a screw connection, a latch, a bayonet fitting, or a press and / or shrink connection. When they engage, they generate a tensile force between the body and the cap, pressing them together and firmly connecting them. According to the invention, the connection of the cap to the body also connects both sealing surfaces at the circular sealing point by means of a conical frictional connection. This combination of tensile force and conical design has the advantage that the cap can be precisely centered on the body, thereby increasing, for example, the accuracy of a spin-stabilized projectile.

[0026] The end face of the front section may, if required, have no additional or at least one additional funnel-shaped sealing surface that runs coaxially to the first sealing surface. The contact surface of the rear section may, if required, have no additional or at least one additional conical sealing surface that runs coaxially to the second sealing surface.

[0027] In one exemplary embodiment, it is determined that

[0028] - the first connecting element has an internal thread formed in an inner surface of the front section; and

[0029] - the second connecting element has an external thread meshing with the internal thread, which is formed in an outer surface of the rear section.

[0030] Consequently, the two connecting elements form a screw connection. Preferably, threadlocker, thread sealant, or similar material is applied between the internal and external threads, thus securing the connection against unintentional loosening and providing an additional seal. The internal thread is preferably coaxial with the longitudinal axis. Preferably, the inner surface of the front section defines the opening and / or borders upon it.

[0031] In one exemplary embodiment, the rear section is specified as having a radially inwardly extending annular groove that runs coaxially around the longitudinal axis and borders the front end of the external thread and / or the rear end of the contact surface. The annular groove can collect excess threadlocker, thread sealant, or similar substances that are forced forward from the gap between the internal and external threads during tightening, i.e., towards the tip of the cap. This ensures a clean interface and a rotationally balanced sealing solution.

[0032] In an exemplary embodiment, it is determined that the first sealing surface tapers axially to the rear, such that a < 90° applies, or tapers axially to the front, such that a > 90° applies. In an exemplary embodiment, it is determined that approximately 40° < a < 70° or approximately 110° < a < 140° applies, a can be selected as required in any way, for example such that AU < a applies, where AU is a lower threshold and preferably is approximately 40°, approximately 45°, approximately 50°, approximately 55°, approximately 60°, approximately 65°, approximately 70°, approximately 110°, approximately 115°, approximately 120°, approximately 125°, approximately 130°, approximately 135° or approximately 140°, and / or that a < AO applies, where AO is an upper threshold and preferably is approximately 40°, approximately 45°, approximately 50°, approximately 55°, approximately 60°, approximately 65°, approximately 70°, approximately 115°, approximately 120°, approximately 125°, approximately 130°, approximately 135° or approximately 140°.

[0033] In an exemplary embodiment, it is determined that the second sealing surface tapers axially to the rear, such that β < 90° applies, or tapers axially to the front, such that β > 90° applies.

[0034] In an exemplary embodiment, it is determined that approximately 40° < β < 70° or approximately 110° < β < 140° applies, β can be selected as required in any way, for example such that BU < β applies, where BU is a lower threshold and preferably is approximately 40°, approximately 45°, approximately 50°, approximately 55°, approximately 60°, approximately 65°, approximately 70°, approximately 110°, approximately 115°, approximately 120°, approximately 125°, approximately 130°, approximately 135° or approximately 140°, and / or that β < BO applies, where BO is an upper threshold and preferably is approximately 40°, approximately 45°, approximately 50°, approximately 55°, approximately 60°, approximately 65°, approximately 70°, approximately 115°, approximately 120°, approximately 125°, approximately 130°, approximately 135° or approximately 140°.

[0035] In an exemplary embodiment, it is determined that approximately 0.1° < θ < 5.0° applies, θ can be selected as required in any way, for example such that DU < θ applies, where DU is a lower threshold and preferably is approximately 0.1°, approximately 0.2°, approximately 0.5°, approximately 1.0°, approximately 2.0° or approximately 5.0°, and / or θ < DO applies, where DO is an upper threshold and preferably is approximately 0.1°, approximately 0.2°, approximately 0.5°, approximately 1.0°, approximately 2.0° or approximately 5.0°.

[0036] In one exemplary embodiment, it is determined that

[0037] - the end face has an additional essentially funnel-shaped sealing surface that runs coaxially around the longitudinal axis with a third conical angle;

[0038] - the third and second cone angles are unequal; and

[0039] - the additional and the second sealing surfaces are abutted by an additional, essentially circular sealing point. This further improves the seal. Preferably, an annular groove extending into the front section or the end face is formed between the additional funnel-shaped sealing surface and the first sealing surface. The third cone angle is, as required, different from or equal to the first cone angle.

[0040] In one exemplary embodiment, it is determined that

[0041] - the mounting surface has an additional essentially conical sealing surface that runs coaxially around the longitudinal axis with a fourth cone angle;

[0042] - the first and fourth cone angles are unequal;

[0043] - the first and the additional sealing surfaces lie against each other via an additional, essentially circular, sealing point.

[0044] This further improves the seal. Preferably, an annular groove extending into the rear section or the contact surface is formed between the additional conical sealing surface and the second sealing surface. The fourth cone angle is, as required, either different from or equal to the second cone angle.

[0045] In one exemplary embodiment, it is determined that

[0046] - the end face has an additional essentially funnel-shaped sealing surface that runs coaxially around the longitudinal axis with a fifth conical angle;

[0047] - the mounting surface has an additional essentially conical sealing surface that runs coaxially around the longitudinal axis with a sixth cone angle;

[0048] - the fifth and sixth cone angles are unequal; and

[0049] - the two additional sealing surfaces lie against each other via an additional, essentially circular sealing point.

[0050] This further improves the seal. Preferably, an annular first groove extending into the front section or end face is formed between the additional funnel-shaped sealing surface and the first sealing surface, and an annular second groove extending into the rear section or contact surface is formed between the additional conical sealing surface and the second sealing surface. The fifth cone angle is, as required, different from or equal to the first cone angle, and the sixth cone angle is, as required, different from or equal to the second cone angle.

[0051] In an exemplary embodiment, it is determined that in a disassembled state of the projectile, in which the body and the hood are not pressed against each other,

[0052] - the body has a first outer diameter in an outer contour region that borders the front region of the end face; and

[0053] - the hood has a second outer diameter in an outer contour area that borders the front area of ​​the mounting surface, which is larger than the first outer diameter.

[0054] Preferably, the difference between the outer diameters is chosen such that, in an assembled state of the projectile, where the body and the cap are pressed against each other by the connecting elements, the front section is deformed outwards by the wedge effect of the abutting sealing surfaces to such an extent that the outer contour areas are aligned flush with each other. This results in a particularly aerodynamically favorable design for the projectile.

[0055] In an exemplary embodiment, it is specified that the projectile has a retaining disc, wherein

[0056] - the rear section has an end face that points axially backwards and lies axially behind the contact surface; and

[0057] - the retaining disc rests against the front surface of the rear section and closes the cavity.

[0058] The retaining disc enables, in particular axial, fixation of a payload housed in the cavity, thus preventing the payload from slipping during transport or when the projectile is fired.

[0059] In one exemplary embodiment, the projectile is specified to have a felt disc that rests against an axially rearward-facing rear side of the retaining disc. The felt disc acts as a length-compensating, fire-retardant, and moisture-reducing device and also serves to dampen and shock-protect the payload, which is particularly advantageous when it contains small subprojectiles.

[0060] When the terms "approximately" or "about" or "essentially" are used in this disclosure in connection with values ​​or ranges of values, or with properties or geometries, they are to be understood as a tolerance range that a person skilled in the art considers customary in this field. In particular, when using the terms "approximately" or "about" in connection with values ​​or ranges of values, a tolerance range is ±20%, preferably ±10%, and more preferably ±5%. Lower limits of value ranges may thus be undershot by 5% to 20%. Upper limits of value ranges may thus be exceeded by 5% to 20%. Where different value ranges, for example, preferred and more preferred value ranges, are specified in the present invention, the lower limits and the upper limits of the different value ranges can be combined with one another.

[0061] In the following, embodiments of the invention are explained in more detail by way of example with reference to the accompanying drawings. The individual features resulting therefrom are not limited to the individual embodiments, but can be combined with individual features described above and / or with individual features of other embodiments. The details in the drawings are to be interpreted as illustrative only, not as limiting. The reference numerals contained in the claims are not intended to limit the scope of protection of the invention in any way, but merely refer to the embodiments shown in the drawings.

[0062] The drawings show in:

[0063] FIG. 1 shows a longitudinal section of a first embodiment of a projectile in a disassembled state, comprising a body with a front section designed according to a first embodiment and a hood with a rear section designed according to a preferred embodiment;

[0064] FIG. 2 shows an enlarged section of the front and rear sections of the projectile of FIG. 1 in an assembled state;

[0065] FIG. 3 shows an enlarged section of the front section designed according to a second embodiment and of the rear section designed according to the preferred embodiment;

[0066] FIG. 4 shows an enlarged section of the front section designed according to a third embodiment and of the rear section designed according to the preferred embodiment;

[0067] FIG. 5 shows an enlarged section of the front section designed according to a fourth embodiment and the rear section designed according to the preferred embodiment; and FIG. 6 shows an enlarged section of the front and rear sections of the projectile designed according to a second embodiment.

[0068] Figures 1 and 2 schematically illustrate a first embodiment of a projectile 10 according to the invention, which exemplifies a medium-caliber projectile for mobile and stationary air and tank guns (not shown). The projectile 10 has a substantially cylindrical body 12 and a forward-tapering, substantially rotationally symmetrical cap 14. The body 12 has a cavity 16 for receiving a payload, which exemplifies several subprojectiles (not shown), a front section 18 designed according to a first embodiment, and a first connecting element 20, which exemplifies an internal thread 20. The internal thread 20 is formed in an inner surface of the front section 18 coaxially with the longitudinal axis L. The inner surface defines and borders the opening.The front section 18 has an opening at its front end leading to the cavity 16 and an annular end face 22 that runs coaxially to a longitudinal axis L of the projectile 10 and surrounds the opening. The end face 22 is located in front of the internal thread 20 and has a first, essentially funnel-shaped sealing surface 24 that runs coaxially around the longitudinal axis L with a first conical angle α and tapers rearward. In this embodiment of the front section 18, the conical angle α is, for example, 55°.

[0069] The hood 14 has a rear section 26, which is configured according to a preferred embodiment and closes the opening of the body 12, and a second connecting element 28, which is, for example, an external thread 28. The external thread 28 is formed coaxially to the longitudinal axis L in an outer surface of the rear section 26 and meshes with the internal thread 20. Thus, the second connecting element 28 detachably engages the first connecting element 20 such that the body 12 and the hood 14 are pressed against each other. The rear section 26 has an annular contact surface 30 at its front end, which extends coaxially to the longitudinal axis L. The contact surface 30 is located in front of the external thread 28 and has a second, substantially conical sealing surface 32, which extends coaxially around the longitudinal axis L with a second conical angle β and tapers rearward. The cone angle β in this embodiment of the back section 26 is, for example, 57°.Thus, the two cone angles a, ß differ by a first difference angle Ö1 = ß - a 0°, which in these embodiments of the front section 18 and the rear section 26 is, for example, +2°.

[0070] Since the two cone angles a, ß differ by the differential angle θ1, the two sealing surfaces 24, 32 do not lie flat against each other, but rather touch at a substantially circular first sealing point 34, which is marked with a dotted circle in FIG. 2 and runs coaxially to the longitudinal axis L. In these embodiments of the front section 18 and the rear section 26, a radially outer edge of the first sealing surface 24 forms an annular ridge extending from the front section 18 or the end face 22, which abuts the contact surface 30 to form the circular sealing point 34.

[0071] In this embodiment, the rear section 26 has a radially inwardly extending annular groove 36, which runs coaxially around the longitudinal axis L and borders the front end of the external thread 28 and the rear end of the contact surface 30. The annular groove 36 can collect excess threadlocker, thread sealant, or similar substances that are forced forward, i.e., towards the tip of the cap 14, from the space between the internal thread 20 and the external thread 28 when the body 12 and the cap 14 are screwed together.

[0072] Figure 3 schematically shows a second embodiment of the front section 18. This embodiment is similar to the first embodiment, so the differences will be explained in more detail below. The rear section 26 is unchanged from the preferred embodiment shown in Figures 1 and 2.

[0073] In this embodiment, the cone angle α of the front section 18 is, for example, 60°, so that the first difference angle θ1 = β - α is, for example, -3°. In these embodiments of the front section 18 and the rear section 26, a radially inner edge of the first sealing surface 24 forms an annular ridge extending from the front section 18 or the end face 22, which abuts the contact surface 30 to form the circular sealing point 34. A third embodiment of the front section 18 is shown schematically in FIG. 4. This embodiment is similar to the first embodiment, so the differences will be explained in more detail below. The rear section 26 is unchanged and designed according to the preferred embodiment of FIGS. 1 and 2.

[0074] In this embodiment, the end face 22 has an additional, essentially funnel-shaped sealing surface 38, namely a third sealing surface 38, which extends coaxially around the longitudinal axis L with a third cone angle Σ (not shown) and is, for example, 52°. Thus, the third and second cone angles Σ, β are unequal, as are the third and first cone angles Σ, a. Therefore, the two cone angles Σ, β differ by a second differential angle θ2 = β - Σ 0°, which, for example, is +5° in these embodiments of the front section 18 and the rear section 26. For example, an annular groove 40 extending into the front section 18 or the end face 22 is formed between the sealing surfaces 24, 38. Thus, the sealing surfaces 24, 38 do not directly abut each other but are connected to each other via the groove 40.

[0075] Since the two cone angles Σ, β differ by the differential angle θ2, the two sealing surfaces 38, 32 do not lie flat against each other, but rather touch at a substantially circular second sealing point 42, which is marked with a dashed circle in FIG. 4 and runs coaxially to the longitudinal axis L. In these embodiments of the front section 18 and the rear section 26, a radially outer edge of the third sealing surface 38 forms an annular ridge extending from the front section 18 or the end face 22, which abuts the contact surface 30 to form the circular sealing point 42.

[0076] Figure 5 schematically shows a fourth embodiment of the front section 18. This embodiment is similar to the third embodiment, so the differences will be explained in more detail below. The rear section 26 is unchanged and designed according to the preferred embodiment of Figures 1 and 2.

[0077] In this embodiment, the first cone angle a is, for example, 60°, and the first difference angle θ1 is therefore -3°. Furthermore, the groove 40 from FIG. 4 is omitted, and the sealing surfaces 24, 38 adjoin each other directly, so that a radially inner edge of the first sealing surface 24 and a radially outer edge of the third sealing surface 38, which borders the inner edge, form an annular ridge extending from the front section 18 or the end face 22, respectively, which abuts the contact surface 30 to form the circular sealing point 34.

[0078] FIG. 6 schematically illustrates a second embodiment of the projectile 10. This embodiment is similar to the first embodiment, so the differences will be explained in more detail below. In this embodiment, the projectile 10 has, by way of example, a substantially circular retaining disc 44 and a substantially circular felt disc 46, which have substantially the same diameter. The rear section 26 has an end face 48 that faces axially rearward and is located axially behind the contact surface 30 and the external thread 28. The retaining disc 44 rests with its axially forward-facing front face against this end face 48 and with its axially rearward-facing rear face against the felt disc 46, thus sealing the cavity 16.

[0079] List of reference symbols:

[0080] 10 floors

[0081] 12 bodies

[0082] 14 Hood

[0083] 16 Cavity

[0084] 18 Anterior section

[0085] 20 first connecting element, internal thread

[0086] 22 Front surface of 18

[0087] 24 first sealing surface

[0088] 26 Return section

[0089] 28 second connecting element, external thread

[0090] 30 site area

[0091] 32 second sealing surface

[0092] 34 first sealing point

[0093] 36 Ring groove

[0094] 38 third sealing surface

[0095] 40 groove

[0096] 42 second sealing point

[0097] 44 Retaining washer

[0098] 46 felt discs

[0099] 48 Front surface of 26 a / ß first / second cone angle

[0100] Ö1 / Ö2 first / second difference angle

[0101] £ third cone angle

[0102] L Longitudinal axis of 10, 12, 14

Claims

Patent claims:

1. Projectile (10), in particular medium caliber projectile for mobile and stationary air, naval and tank guns, comprising: - having a body (12), having: - a cavity (16) for receiving a payload, - a front section (18) having an opening leading to the cavity (16) and an annular end face (22) that is coaxial with a longitudinal axis L of the projectile (10) and surrounds the opening, and - a first connecting element (20); - a hood (14), comprising: - a rear section (26) that closes the opening of the body (12) and has an annular contact surface (30) that runs coaxially to the longitudinal axis L, and - a second connecting element (28) which detachably engages the first connecting element (20) in such a way that the body (12) and the hood (14) are pressed against each other; characterized in that - the end face (22) has a first, essentially funnel-shaped sealing surface (24) which extends around the longitudinal axis L with a first cone angle a; - the mounting surface (30) has a second, essentially conical sealing surface (32) which extends around the longitudinal axis L with a second cone angle β; - the two cone angles a, ß differ by a difference angle θ1 = ß - a ≥ 0°; and - the two sealing surfaces (24, 32) lie sealingly against each other via an essentially circular sealing point (34).

2. Floor (10) according to claim 1 , characterized in that - the first connecting element (20) has an internal thread (20) formed in an inner surface of the front section (18); and - the second connecting element (28) has an external thread (28) meshing with the internal thread (20), which is formed in an outer surface of the rear section (26).

3. Floor (10) according to claim 2, characterized in that the rear section (26) has a radially inwardly extending annular groove (36) which is circumferentially The longitudinal axis L runs and borders the front end of the external thread (28) and / or the rear end of the contact surface (30).

4. Floor (10) according to one or more of the preceding claims, characterized in that the first sealing surface (24) tapers axially to the rear, such that a < 90° applies, or tapers axially to the front, such that a > 90° applies.

5. Floor (10) according to claim 4, characterized in that approximately 40° < a < 70° or approximately 110° < a < 140° applies.

6. Projectile (10) according to one or more of the preceding claims, characterized in that the second sealing surface (32) tapers axially to the rear, such that β < 90° applies, or tapers axially to the front, such that β > 90° applies.

7. Floor (10) according to claim 6, characterized in that approximately 40° < ß < 70° or approximately 110° < ß < 140° applies.

8. Floor (10) according to one or more of the preceding claims, characterized in that 0.1° < θ < 5.0° applies.

9. Floor (10) according to one or more of the preceding claims, characterized in that - the end face (22) has an additional essentially funnel-shaped sealing surface (38) which extends around the longitudinal axis with a third conical angle £; - the third cone angle £ and the second cone angle β are unequal; and - the additional and the second sealing surface (38, 32) are sealed against each other via an additional essentially circular sealing point (42). 10th floor (10) according to one or more of the preceding claims, characterized in that - the mounting surface (30) has an additional essentially conical sealing surface which extends around the longitudinal axis L with a fourth conical angle; - the first cone angle α and the fourth cone angle are unequal; and - the first and the additional sealing surfaces lie against each other via an additional, essentially circular, sealing point. - 16 - 11. Floor (10) according to one or more of the preceding claims, characterized in that - the end face (22) has an additional essentially funnel-shaped sealing surface which extends around the longitudinal axis with a fifth conical angle; - the mounting surface (30) has an additional essentially conical sealing surface which extends around the longitudinal axis with a sixth conical angle; - the fifth and sixth cone angles are unequal; and - the two additional sealing surfaces lie against each other via an additional, essentially circular sealing point.

12. Floor (10) according to one or more of the preceding claims, characterized in that in a disassembled state in which the body (12) and the hood (14) are not pressed against each other, - the body (12) has a first outer diameter in an outer contour region that borders the front region of the end face (22); and - the hood (14) has a second outer diameter in an outer contour area that borders the front area of ​​the mounting surface (30) which is larger than the first outer diameter. 13th floor (10) according to one or more of the preceding claims, comprising - a retaining washer (44), wherein - the rear section (26) has an end face (48) that points axially backwards and lies axially behind the contact surface (30); and - the retaining disc (44) rests against the end face (48) of the rear section (26) and closes the cavity (16).

14. Floor (10) according to claim 13, comprising a felt disc (46) which rests against an axially rearward-facing rear side of the retaining disc (44).

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