Shaft sealing ring

Abstract

The invention relates to a method for producing a shaft sealing ring (10), in particular a radial shaft sealing ring, wherein a base ring (1) is provided, wherein a surface (1.4) of the base ring (1) is roughened at least in certain portions, wherein a plastics sealing portion (2) is placed on the roughened surface (1.4) and wherein the base ring is heated and at the same time the plastics sealing portion (2) is pressed onto the roughened surface (1.4) in order to connect the plastics sealing portion (2) to the base ring (1).

Description

[0001] Shaft seal

[0002] The invention relates to a method for producing a shaft sealing ring, in particular a radial shaft sealing ring.

[0003] Shaft seals are sealing elements designed to prevent the leakage of fluids, particularly along a rotating shaft. They can also prevent the ingress of dust. Shaft seals are used in a wide variety of technical applications involving rotating components, such as transmissions or engines. Radial shaft seals are annular shaft seals through which the rotating shaft extends, and whose sealing lip extends essentially in the radial direction.

[0004] Typically, shaft seals consist of at least two different materials: a plastic section that acts as the actual sealing material and a generally annular base ring in which the sealing material is secured. To reliably connect the plastic sealing section to the base ring and prevent relative movement during use, it is known, for example, to design the base ring in two parts and fix the sealing material between the two parts, e.g., by flanging the two parts at the ends. While this connection method can ensure a reliable hold of the sealing material on the base ring and also a sufficient seal, it requires a comparatively large number of components and, due to the flanging, also many work steps.

[0005] Based on this, the invention has the object of providing a simplified method for producing a shaft sealing ring.

[0006] To achieve this object, it is proposed that a base ring is first provided, the surface of which is roughened at least in sections, before a plastic sealing section is placed on the roughened surface. The base ring is then heated and the plastic sealing section is simultaneously pressed onto the roughened surface in order to connect the plastic sealing section to the base ring. By roughening the surface of the base ring, the effective surface area can be increased, resulting in better overall contact between the base ring and the plastic sealing section. Compared to a smooth surface, the adhesion of the plastic sealing section to the base ring can thus be improved. By additionally heating the base ring, when the plastic sealing section is pressed onto the base ring, the surface of the plastic sealing section that is in contact with the base ring is liquefied orat least becomes more fluid. Due to the improved flow properties and the resulting lower viscosity, the roughened surface of the base ring can be better wetted by the plastic sealing section. In conjunction with the compressive force pressing the plastic sealing section onto the roughened surface, this ensures that the plastic wets the entire roughened surface. When the base ring with the pressed-on plastic sealing section is cooled, the two components are firmly and inseparably bonded.

[0007] With regard to the process, it has also proven advantageous if the surface is roughened by laser structuring. Roughening the surface by laser structuring, in particular by remote laser structuring, has advantages in terms of its suitability for automation. This is because surface roughening using a laser can be automated relatively easily and carried out in a single operation before the plastic sealing section is placed and pressed, without the base ring having to be moved. However, it is also possible to carry out the process in different machines or stations and to roughen the base ring beforehand. To carry out the laser structuring, a laser robot can be provided that moves a laser beam over the surface to be roughened and removes material to create a specific roughness.Furthermore, roughening by laser structuring is characterized by a surface profile that can be defined relatively precisely in advance. This means that the roughness of the surface can be adjusted very precisely and adapted to the material of the plastic sealing section, as well as the temperature to which the base ring is heated and the pressure with which the plastic sealing section is pressed onto the base ring. The parameters are preferably selected to ensure the best possible hold of the plastic sealing section on the base ring. Furthermore, it is generally not necessary to clean a surface roughened by laser structuring before the next processing step. The wavelength of the laser can be adapted to the material of the base ring, ensuring good absorption of the applied laser radiation.As an alternative to laser structuring, the surface can also be roughened using another process. This could include chemical processes such as etching or pickling, or abrasive processes such as sandblasting or shot blasting.

[0008] It is advantageous if the surface has undercuts after roughening, so that there is an interlocking of the plastic sealing section or the adhesion promoter explained in more detail below. Due to these undercuts, the plastic sealing section can be positively connected to the base ring at a microscopic level. The geometric design of the undercuts can be achieved and adjusted in particular by laser structuring the surface. To ensure reliable adhesion, it has proven advantageous if the surface is roughened to an average roughness of 70 to 220 pm, preferably 100 to 200 pm, in particular 120 to 180 pm. To ensure reliable adhesion of the two components to one another, the roughness of the surface must not be too low initially, since otherwise there will be insufficient connection surface.Furthermore, the roughness must not be too great, as otherwise, despite heating and pressing on the plastic sealing section, the surface cannot be sufficiently wetted, and the material of the plastic sealing section cannot penetrate deeply enough into the surface structure of the base ring due to an overly fine surface structure. Therefore, both too small and too large a surface roughness can lead to poor adhesion of the plastic sealing section, and it could be sheared off from the base ring during subsequent use. The preferred roughness can also depend on the material used for the base ring. This means that different roughnesses can be used for different materials.If the base ring is made of steel, average roughnesses between 75 and 100 pm and if the base ring is made of an aluminum alloy, average roughnesses between 200 and 220 pm have proven to be particularly preferred in practice.

[0009] In order to improve adhesion even further, it has proven advantageous to apply a bonding agent to the roughened surface. The bonding agent can be applied to the roughened surface before the plastic sealing section is placed and can therefore essentially be arranged between the plastic sealing section and the base ring. The bonding agent can be characterized by better wetting of the roughened surface of the base ring than direct wetting of the surface with the material of the plastic sealing section. In addition, the melting point or glass transition temperature of the bonding agent can be lower than the melting point or glass transition temperature of the material of the plastic sealing section. The bonding agent can also be chemically compatible with the material of the plastic sealing section, so that the bonding agent or the polymer chains of the bonding agent can bond with the plastic sealing section.can be inseparably bonded to the polymer chains of the plastic sealing section. The adhesion promoter can be an FEP layer, especially an FEP film. Even very thin FEP films, for example, in the range of 100 μm, can be sufficient to exert their positive adhesive effect. Furthermore, the adhesion promoter can also be sprayed onto the roughened surface. In both cases, it is not necessary to move the base ring, so the application of the adhesion promoter can be easily integrated into the manufacturing process.

[0010] To prevent the base ring from moving unintentionally, particularly when pressing on the plastic sealing section, it has proven advantageous to place the base ring in a joining die. The base ring can be placed in the joining die before roughening the surface and is thus secured against slipping. The plastic sealing section can be pressed onto the base ring using a pressure stamp. The pressure stamp can be moved vertically and pressed from above onto the plastic sealing section placed on the surface. In practice, good adhesion of the plastic sealing section to the base ring has been achieved with pressures in the range of 200 N to 2000 N.

[0011] To heat the base ring, it has proven advantageous to inductively heat the roughened surface of the base ring. By inductively heating the surface, only the surface of the base ring, and thus the area in contact with the plastic sealing section, can be heated in a very targeted manner. The remaining sections of the base ring cannot be actively heated, as heating these sections would not improve the adhesion. In fact, heating the entire base ring would not only require a significantly greater input of energy, but the amount of heat to be introduced and the surface temperature, which are crucial for the adhesion of the plastic sealing section, could not be adjusted as precisely. Advantageously, only the roughened surface of the base ring is heated, while the rest of the base ring is not actively heated and therefore only heats up to a small extent.Inductive heating allows the amount of heat applied to be precisely controlled and metered. This results in a very precisely defined heat input, resulting in a precisely defined heating of the plastic sealing section or the bonding agent via the base ring. Thermal decomposition due to excessive heat input or unintentional structural changes in the plastic sealing section can be reliably prevented. Since only the surface of the base ring is heated, it cools very quickly after heating, allowing the excess heat from the plastic sealing section or the bonding agent to flow back into the base ring after the heating process. A heating tool, which can be integrated into the joining die, can be provided for heating purposes.The heating tool can heat the surface of the base ring using eddy currents, causing the plastic sealing section to melt at the interface and wet the surface of the base ring. Other methods for heating the base ring or its surface are also conceivable.

[0012] With regard to the heating process, it has been found to be advantageous if the roughened surface of the base ring is heated to 200 to 400 degrees Celsius, preferably to 250 to 350 degrees Celsius, in particular to 280 to 320 degrees Celsius for between 3 and 20 seconds, preferably between 5 and 16 seconds, more preferably between 8 and 14 seconds, and in particular between 10 and 12 seconds. As already indicated above, excessively long or excessive heating could lead to undesirable structural changes, which could ultimately have a negative impact on the sealing effect and also on the service life of the shaft seal. The heating time and the surface temperature are advantageously adjusted so that sufficient liquefaction or viscosity reduction of the plastic sealing section or the adhesion promoter occurs, thus leading to sufficient surface wetting, but excessive energy input is avoided.In practice, the parameters mentioned have led to a reliable connection between the plastic sealing section and the base ring.

[0013] According to an advantageous development of the invention, it is provided that the plastic sealing section

[0014] After the base ring has cooled, the component is still pressed onto the base ring. The pressing-on process therefore advantageously takes longer than the heating process. The two processes can largely take place simultaneously. It can also be provided that the surface of the base ring is heated first and then the compressive force is only applied to the plastic sealing section at a somewhat later point in time, e.g. when the boundary layer has already partially liquefied. By pressing on, the thermal contact resistance between the surface of the base ring and the plastic sealing section can be reduced, which can be taken into account in the sequence of processes as well as in the heating duration and the surface temperature of the base ring. The longer pressing on process allows the components to cool down in the pressed state.The compressive force can only be removed once the connection between the plastic sealing section and the base ring has been reliably established. Once the cooling process is complete and the desired final temperature has been reached, the finished shaft seal can be ejected from the joining die. Advantageously, the entire manufacturing process can thus take only about 40 seconds per shaft seal.

[0015] According to a further advantageous method step, the plastic sealing section protrudes radially inwards from the base ring and this protruding region is formed into a sealing lip. The protruding region can be unformed using a forming tool, ensuring that the resulting sealing lip can engage a shaft when the shaft seal is used. The sealing lip can be formed in the direction of the axial section of the base ring, so that the sealing lip has a funnel-shaped rounded portion at its inner circumferential end region. Forming in the other direction is also possible. Furthermore, it is also possible for the sealing lip to have a corresponding rounded portion at its outer circumferential end region.If the plastic sealing section is not appropriately reshaped to form a sealing lip, it can also be preformed in advance, i.e., before being placed on the roughened surface of the base ring. In the opposite end area of ​​the plastic sealing section, it can be positioned against the inner contour of the base ring, particularly when pressed onto the base ring. This prevents protruding edges, which could potentially lead to the connection between the plastic sealing section and the base ring becoming loose again during later use.

[0016] With regard to the object mentioned above, a shaft seal, in particular a radial shaft seal, is also proposed, which is manufactured using the method described above. This results in the advantages already described with regard to the method. The design of the shaft seal will be explained in more detail below, whereby the description of the individual components also applies to the method.

[0017] The shaft seal advantageously has a base ring with a surface that is roughened at least in sections, and a plastic sealing section that is connected to the base ring via the roughened surface. The base ring can have an axial section and a radial section, both of which can have an annular geometry overall and which can be connected to one another via a corner that is in particular rounded. When the shaft seal is in use, the axial section can thus extend essentially parallel to the shaft surface to be sealed, and the radial section can extend transversely thereto. The radial section can have an opening, in particular a circular opening, through which the shaft to be sealed can extend. In cross-section, the base ring can have an L-shaped contour. The shaft seal can thus be designed as an angled ring.

[0018] The plastic sealing section can be arranged on the surface of the radial section that faces in the direction of the axial section. This means that the plastic sealing section can be arranged on the inside of the radial section and protected by the axial section. Furthermore, the plastic sealing section can also be arranged on the opposite side and connected to the base element as described above. The plastic sealing section can therefore also be arranged on the outside of the base element. An arrangement on both the inside and the outside is also possible. The shaft seal can therefore be designed as a double-lip shaft seal. The annular surface of the radial section to which the plastic sealing section is to be attached can be roughened before the components are pressed together, as described above.Advantageously, the exact surface with which the plastic sealing section comes into contact is roughened so that the most full-surface connection possible can be guaranteed. The section of the plastic sealing section that is connected or to be connected to the base ring can be designed as a connecting area, to which the sealing lip adjoins further inward in the radial direction. The connecting area can lie as flatly as possible on the roughened surface of the base ring. The plastic sealing section can be annular in shape, although the free inner diameter of the plastic sealing section can be smaller than the free inner diameter of the base ring. The part of the plastic sealing section that projects inwards in the radial direction can function as a sealing lip and provide the sealing effect against the shaft guided through the free inner cross-section of the plastic sealing section.Fluids cannot therefore pass through the sealing lip in the axial direction.

[0019] From a design point of view, it has also proven advantageous if the radial section has a support bevel at its radial inner end to support the sealing lip. The support bevel allows the radially inner part of the plastic sealing section to be unformed so that it can rest against the shaft to be sealed. It may also be possible for the surface of the support section to be roughened to ensure a reliable connection of the components in this area as well. When pressed on, the plastic sealing section can thus rest against the surface of the support bevel and be deformed to form the sealing lip. The support bevel can act as a sealing lip support and can bend the radially inner part of the plastic sealing section in the axial direction.For this purpose, the support slope can be inclined in the axial direction and enclose an angle with the radial section of between 20 and 70 degrees, preferably between 30 and 60 degrees, more preferably between 40 and 50 degrees, in particular of 45 degrees.

[0020] With regard to the material of the shaft seal, it has proven advantageous if the base ring is made of

[0021] Metal, in particular steel or an aluminum alloy. The base ring can therefore ensure sufficient stability of the shaft seal. Due to the conductivity of the base ring material, its surface can be easily heated in the manner described above. The plastic sealing section can be made of a polymer, in particular PTFE. If necessary, additives can be incorporated into the polymer, e.g. to change its properties. The use of PTFE in particular has proven advantageous because PTFE not only ensures reliable sealing, but also because the material-dependent friction effect between PTFE and metal is low and the plastic sealing section or sealing lip therefore exerts only a very low braking torque on the rotating shaft to be sealed.

[0022] Furthermore, with regard to the above-mentioned object, a device for producing a shaft sealing ring using a method of the type described above is proposed. The device has a joining die into which the base ring can be inserted, a heating element for heating the surface of the base ring, and a pressure stamp, via which the plastic sealing section can be pressed onto the base ring. The heating element can be designed as an inductive heating element and can be integrated into the joining die. The pressure stamp can be cup-shaped and have a circular pressure surface with which it can press the likewise annular plastic sealing section onto the base ring. Furthermore, the device can also have a laser, in particular a laser movable in at least two axes, via which the surface of the base ring can be roughened, as described above.The laser allows surface processing to be carried out directly in the joining matrix, which significantly simplifies the overall manufacturing process.

[0023] Further details and advantages of the invention will be explained in more detail below with reference to the accompanying drawings, in which:

[0024] Fig. la, lb sectional views of a shaft sealing ring in two different processing steps;

[0025] Fig. 2 is a sectional view of a shaft seal;

[0026] Fig. 3 is a sectional view of a shaft sealing ring in another embodiment;

[0027] Fig. 4 is a schematic view of the steps for manufacturing a shaft seal;

[0028] Fig. 5 is a schematic view of an apparatus for producing a shaft sealing ring;

[0029] Fig. 6 is a schematic view according to Fig. 5 with a pressed-on pressure stamp.

[0030] The illustration in Fig. 5 initially shows a device 6 with which shaft sealing rings 10 can be produced in a simple manner using a method as illustrated in the illustration in Fig. 4. The device 6 has a joining die 3, a pressure stamp 4 and a heating element (not explicitly shown) as well as a laser (not shown).

[0031] According to method step S1, in a first step, a base ring 1 is provided and placed in the joining die 3. The base ring 1 has an L-shaped geometry, as can be seen, for example, from the illustration in Fig. 1a, and essentially consists of two sections, namely a radial section 1.1, which extends parallel to the joining die 3, and an axial section 1.2, which circumferentially borders the radial section 1.1 and protrudes perpendicularly from the radial section 1.1 and thus also from the surface of the joining die 3. After the base ring 1 has been placed in the joining die and fixed so that it can no longer move, the upward-facing surface 1.4 of the radial section 1.1 is roughened by a laser in step S2. The laser scans the surface 1.4 fully automatically, so that the surface 1.4 has a predefined roughness at the end of this roughening process. In step S3, an adhesion promoter in the form of a thin FEP film is then applied to the roughened surface 1.4, before in step S4 an annular plastic sealing section 2 made of PTFE is placed on the roughened surface 1.4 or on the adhesion promoter. The plastic sealing section 2 can also be seen, for example, in the illustration in Fig. 1a. The plastic sealing section 2 essentially consists of two areas, namely an annular connecting area 2.1, which rests on the roughened surface 1.4, and a sealing lip 2.2 arranged radially further inward. The sealing lip 2.2 can either be initially flat as shown in Fig. 1a and then bent in a subsequent step, either by a tool or when sliding the shaft sealing ring onto a shaft, in order to achieve the roughness shown in Fig.lb to obtain a design that can be recognized, or the sealing lip 2.2 can already be pre-formed.

[0032] In the next step S5, the pressure stamp 4 is placed from above onto the plastic sealing section 2 or onto the connecting area 2.1 of the plastic sealing section 2 and pressed downwards onto the base ring 1 with a specific force. As can be seen, for example, from the illustration in Fig. 6, the pressure stamp 4 has a cup-shaped geometry and an annular contact surface at the lower end, via which it can be placed as completely as possible onto the plastic sealing section 2 or the connecting area 2.1. At the same time, in step S6, the heating element is activated, which heats the roughened surface 1.4 of the base ring 1. Due to the contact of the base ring 1 with the plastic sealing section 2, the surface boundary layer of the plastic sealing section 2 facing the roughened surface 1.4 of the base ring 1 is also heated, which leads to a brief and locally limited liquefaction of the plastic sealing section 2.At the same time, the adhesion promoter is also heated and liquefied. The adhesion promoter bonds with the plastic sealing section 2 and flows into the previously created surface irregularities of the base ring 1. The simultaneous heating and pressing allows the roughened surface 1.4 to be wetted as completely as possible by the adhesion promoter or the connecting area 2.1 of the plastic sealing section 2, so that the surface irregularities are filled by the material of the adhesion promoter and / or the plastic sealing section 2. The surface 1.4 of the base ring 1 only needs to be heated for a short time, because the adhesion promoter and the plastic sealing section 2 melt comparatively quickly due to their chemical composition, and to create a reliable connection, it is sufficient if only the uppermost boundary layer of the plastic sealing section 2 is briefly melted.

[0033] As soon as the heating element 5 no longer applies any heat, both the surface 1.4 of the base ring 1 and the surface of the plastic sealing section 2 cool down quickly again. The material of the plastic sealing section 2 or the adhesion promoter that has flowed into the unevenness of the roughened surface 1.4 of the base ring 2 hardens in the process, so that the plastic sealing section 2 is then firmly connected to the base ring 2. Detaching the plastic sealing section 2 from the base ring 1 is then only possible with the application of very great force. In step S7, when the connection has cooled sufficiently and thus solidified sufficiently, the pressure stamp 4 is moved upwards again and the finished shaft sealing ring 10 can be ejected from the joining die 3.

[0034] The illustrations in Figs. 1a, 1b, as well as 2 and 3, show slightly differently designed shaft sealing rings 10 in a sectional cross-sectional view. In each case, only the upper part of the cut rings is visible. The shaft to be sealed later is not shown, although this would extend through a free internal cross-section of the shaft sealing ring 10. The illustration in Fig. 1a shows the annular plastic sealing section 2 arranged on the roughened surface 1.4 after connection by heating and pressing, as described above with regard to the illustration in Figs. 4, 5, and 6.

[0035] The illustration in Fig. 1a initially shows a flat plastic sealing section 2 which protrudes radially inwards from the base ring 1. The plastic sealing section 2 is bent in its radially outer edge region so that it conforms to the inner surface of the base ring 1 and thus also rests a little bit against the axial section 1.2. In contrast to Fig. 1a, Fig. 1b now shows the same shaft seal 10, but the inner section of the plastic sealing section 2 has been bent in the axial direction. This can be done in the plastic area using a stamping tool, but the illustration in Fig. 1b can also show the orientation of the plastic sealing section 2 when used on a rotating shaft. This is because the shaft runs centrally through the shaft seal 10 and thus also through the free inner cross-section of the base ring 1.The shaft has a larger diameter than the free inner cross-section of the plastic sealing section 2, so that the plastic sealing section 2 is expanded and deflected by the shaft and then pressed onto the shaft with a certain radial force to create the sealing effect. The inner part of the plastic sealing section 2, which protrudes from the base ring 1, thus functions as a sealing lip 2.2.

[0036] The shaft sealing rings 10 shown in Figs. 2 and 3 differ from the shaft sealing rings 10 shown in Figs. 1a and 1b in that the radial section 1.1 of the base ring 1 is not flat, but is bent upwards on its inside. This area, which is bent upwards in the axial direction, acts as a support bevel 1.3, which also bends the inner area of ​​the plastic sealing section 2 accordingly in the axial direction. The support bevel 1.3 thus acts as a sealing lip support and supports the sealing lip 2.2. The shaft sealing ring 10 can therefore only be pushed onto the shaft from one direction during later use. However, with appropriate installation bevels, installation from the other direction is also possible.

[0037] In the shaft sealing ring 10 shown in Fig. 3, the support bevel 1.3 is formed by an angular displacement of the radial section 1.1 of the base ring 1. The support bevel 1.3 forms an angle of approximately 45 degrees with the radial section 1.1 and is angled relative to the radial section 1.1 in the direction of the axial section 1.2. In the shaft sealing ring 10 shown in Fig. 2, the support bevel 1.3 is formed at the end of the axial section 1.2 in the direction of the axial section 1.2. In both cases, the support bevel 1.3 supports the sealing lip 2.2 and deflects the sealing lip 2.2 to a certain extent. It can also be seen that the materials of the base ring 1 differ. In the shaft sealing rings 10, which can be seen in the illustrations in Figs. 1a, 1b and 3, the base ring 1 is made of steel and the slightly thicker base ring 1 according to Fig. 2 is made of aluminum.

[0038] The shaft sealing ring 10 described above can be easily manufactured in just a few steps and is characterized by a good sealing effect and, due to the firm connection between the base ring 1 and the plastic sealing section 2, by a high degree of robustness.

[0039] LIST OF REFERENCE SYMBOLS

[0040] 1 base ring

[0041] 1.1 Radial section

[0042] 1.2 Axial section

[0043] 1.3 Support slope

[0044] 1.4 Surface

[0045] 2 plastic sealing section

[0046] 2.1 Connection area

[0047] 2.2 Sealing lip

[0048] 3 joining die

[0049] 4 printing stamps

[0050] 6 Device

[0051] 10 Shaft seal

Claims

PATENT CLAIMS 1. A method for producing a shaft sealing ring (10), in particular a radial shaft sealing ring, comprising the following steps: Providing a base ring (1), Roughening the surface (1.4) of the base ring (1) at least in sections; Placing a plastic sealing section (2) on the roughened surface (1.4); Heating the base ring (1.4) and simultaneously pressing the plastic sealing section (2) onto the roughened surface (1.4) to connect the plastic sealing section (2) to the base ring (1).

2. Method according to claim 1, characterized in that the surface (1.4) is roughened by means of laser structuring.

3. Method according to one of claims 1 or 2, characterized in that the surface (1.4) is roughened to an average roughness of 70 to 220 pm, preferably 100 to 200 pm, in particular 120 to 180 pm, in particular that the surface (1.4) is roughened to 75 to 100 pm in the case of a base ring (1) made of steel and to 200 to 220 pm in the case of a base ring (1) made of an aluminium alloy.

4. Method according to one of the preceding claims, characterized in that an adhesion promoter is applied to the roughened surface (1.4) to improve the adhesion between the roughened surface (1.4) and the plastic sealing section (2).

5. Method according to one of the preceding claims, characterized in that the base ring (1) is inserted into a joining die (3) and the plastic sealing section (2) is pressed onto the base ring (1) via a pressure stamp (4).

6. Method according to one of the preceding claims, characterized in that the roughened surface (1.4) of the base ring (1) is heated inductively.

7. The method according to claim 6, characterized in that the roughened surface (1.4) of the base ring (1) is heated to 200 to 400 degrees, preferably to 250 to 350 degrees, in particular to 280 to 320 degrees, for between 3 and 20 seconds, preferably between 5 and 16 seconds, more preferably between 8 and 14 seconds and in particular between 10 and 12 seconds.

8. Method according to one of the preceding claims, characterized in that the plastic sealing section (2) continues to be pressed onto the base ring (1) as the base ring (1) cools.

9. Method according to one of the preceding claims, characterized in that the plastic sealing section (2) protrudes radially inwards relative to the base ring (1) and this protruding region is formed into a sealing lip (2.2).

10. Shaft sealing ring, in particular radial shaft sealing ring, produced by a method according to one of the preceding claims, with a base ring (1) having a surface (1.4) which is roughened at least in sections and a plastic sealing section (2) which is connected to the base ring (1) via the roughened surface (1.4), wherein the base ring (1) has an axial section (1.2) and a radial section (1.1) and the plastic sealing section (2) is arranged on the surface (1.4) of the radial section (1.1) which points in the direction of the axial section (1.2).

11. Shaft sealing ring according to claim 10, characterized in that the radial section (1.1) has at its radial inner end a support bevel (1.3) for supporting a sealing lip (2.2), wherein the support bevel (1.3) is inclined in the direction of the axial section (1.2).

12. Shaft sealing ring according to one of claims 10 or 11, characterized in that the base ring (1) consists of metal, in particular of steel or an aluminum alloy, and the plastic sealing section (2) consists of PTFE.

13. Device for producing a shaft sealing ring (10) using a method according to one of claims 1 to 9, comprising a joining die (3) into which a base ring (1) can be inserted, a heating element for heating the surface (1.4) of the base ring (1) and a pressure stamp (4) via which a plastic sealing section (2) can be pressed onto the base ring (1).

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