Sealing arrangement for a wheel bearing unit, wheel bearing unit, use of a scalable coating and method for sealing a sealing seat in a wheel bearing unit

Abstract

The invention relates to a sealing arrangement (3) for a wheel bearing unit (1) of a motor vehicle, comprising a sealing unit (8) having a sealing bearing (10) and a sealing element (11) arranged on the sealing bearing (10), and wherein the sealing element (11) is arranged on the sealing bearing (10). The invention relates to a wheel bearing unit (1) comprising a seal support (10) designed to be joined to an outer ring (5) of the wheel bearing unit (1) such that an outer circumferential surface (12) of the seal support (10) and an inner circumferential surface (13) of the outer ring (5) form a first seal seat (14), and a slinger disc (9) designed to be joined to an inner ring (4) of the wheel bearing unit (1) such that the outer circumferential surface (12) of the seal support (10) and the inner circumferential surface (13) of the outer ring (5) form a second seal seat (14). The inner ring (4) and the slinger disc (9) are arranged such that an inner circumferential surface (15) of the slinger disc (9) and an outer circumferential surface (16) of the inner ring (4) form a second sealing seat (17), the outer circumferential surface (12) of the sealing support (10) and / or the inner circumferential surface (15) of the slinger disc (9) having a washable coating (19) for sealing a respective static sealing seat (14, 17), the coating (19) has a binder component (20) and a hardener component (21), and wherein the binder component (20) and / or the hardener component (21) are / is embedded as microcapsules (23) in a support material (22) of the coating (19). The invention also relates to a wheel bearing unit (1) of a vehicle, to the use of a washable coating (19) for sealing a sealing seat (14, 17) in a wheel bearing unit (1) of a vehicle, and to a method (30) for sealing a sealing seat (14, 17) in a wheel bearing unit (1) of a vehicle.

Description

TECHNICAL FIELD

[0001] The present invention relates to a sealing arrangement for a wheel bearing unit of a vehicle, to a wheel bearing unit for a vehicle, to a use of an activatable coating for sealing a sealing seat in a wheel bearing unit, and to a method for sealing a sealing seat in a wheel bearing unit. BACKGROUND

[0002] Seals for sealing wheel bearing units, in particular wheel bearings, are widely known in the prior art. For example, so-called cassette seals are used for sealing wheel bearings in passenger cars or trucks. The seals serve to protect the rolling element chamber of the wheel bearing from outside against the ingress of foreign substances such as water, dust particles, etc.

[0003] The seals are usually formed as a two-part assembly, wherein a first assembly is joined to a stationary element of the wheel bearing, for example to an outer ring of the wheel bearing, and a second assembly is joined to a rotatable element of the wheel bearing, for example to an inner ring of the wheel bearing. These joining connections between the wheel bearing and the sealing arrangement are also referred to as static sealing seats. In order to prevent the ingress of foreign substances via the static sealing seats from the outside into the rolling element chamber, it is known to provide the usually metallic sealing seats with a rubber coating which is intended to prevent the ingress of foreign substances as much as possible.

[0004] It has become apparent that there is a need for further improving the known sealing arrangements and the known wheel bearing units. In particular, there is a need for further providing a sealing arrangement for a wheel bearing unit and / or a wheel bearing unit which improves the leakage behavior in the area of the sealing seats, in particular the static sealing seats. In other words, it can be said that there is a need for further providing a sealing arrangement for a wheel bearing unit and / or a wheel bearing unit which particularly improves the tightness in the area of the sealing seats, in particular the static sealing seats, and thus reduces or even prevents the ingress of foreign substances from the outside into the area of the sealing seats.

[0005] Against this background, it is an object of the present invention to provide an improved sealing arrangement for a wheel bearing unit and an improved wheel bearing unit for a vehicle which particularly improves the leakage behavior in the area of the sealing seats, in particular the static sealing seats. SUMMARY

[0006] This object and other objects, which will become apparent during the following description, are solved by the subject matter of the independent claims. Advantageous embodiments and further improvements can be found in the dependent claims and the following description.

[0007] The sealing arrangement for a wheel bearing unit of a vehicle, in particular a motor vehicle, such as a passenger car or a truck, according to the application has a sealing unit and a slinger disc. The sealing unit has a sealing support and a sealing element arranged on the sealing support. The sealing support is designed to be joined to an outer ring of the wheel bearing unit such that an outer peripheral surface of the sealing support and an inner peripheral surface of the outer ring form a first sealing seat, in particular a first static sealing seat. The slinger disc is designed to be joined to an inner ring of the wheel bearing unit such that an inner peripheral surface of the slinger disc and an outer peripheral surface of the inner ring form a second sealing seat, in particular a second static sealing seat. The outer peripheral surface of the sealing support and / or the inner peripheral surface of the slinger disc has an activatable coating for sealing the respective static sealing seat. The coating comprises an adhesive component and a hardener component, wherein the adhesive component and / or the hardener component are embedded as microcapsules in a support material of the coating.

[0008] In the microcapsules, the respective component is coated by a polymer shell. The coating first prevents contact between the adhesive component and the hardener component and thus a chemical reaction between the two components which leads to the formation of a hardened adhesive layer. This means that the microcapsules can prevent a reaction between the adhesive component and the hardener component until the microcapsules are broken or are broken.

[0009] It is conceivable that only the adhesive component or the hardener component is present as microcapsules. In this case, the other component is mixed into the support material.

[0010] The term "static sealing seat" is understood to mean a sealing seat which is essentially static. This means that the connection between the two elements which form the sealing seat is static, i.e. no significant relative movement between these elements occurs during operation. The term "static" does not exclude minimal, extremely small relative movements between the elements, for example due to vibrations which can occur during operation.

[0011] The advantages of the solution according to the application are in particular that the coating can be applied before the sealing arrangement is installed in a bearing, in particular a wheel bearing of a wheel bearing unit, and that the installation does not necessarily have to take place essentially directly after the application of the coating. In other words, the coating makes it possible to establish a support for the sealing arrangement with the applied coating without having to worry about the coating hardening. Furthermore, the coating can be applied mechanically and thus economically. In addition, a predetermined layer thickness can be selected and applied, which can reduce or even avoid the risk of incorrect distribution of the adhesive component and the hardener component. Furthermore, by applying the coating, the position of the coating and thus of the adhesive component can be selected. In other words, it can be said that the coating can be applied essentially precisely at the desired location.

[0012] According to one embodiment, the coating is thermally activated, for example when a predetermined temperature is reached, and / or is chemically activated, for example by a chemical reaction with another substance, and / or is mechanically activated, for example by or under the application of a mechanical load.

[0013] The activation of the coating leads to the microcapsules breaking open, thereby allowing the adhesive component and the hardener component to come into contact with each other, mix and harden together to form an adhesive layer. The targeted activation of the coating and thus the targeted breaking open of the microcapsules makes it possible to specifically select the start of the reaction between the adhesive component and the hardener component, which makes it possible to form a hardened adhesive layer. In particular, the mechanical activation, for example by the application of a predetermined mechanical load, such as an installation force when inserting or pressing a seal carrier or a slinger disc into a wheel bearing, on a shaft or into a housing, is particularly suitable for establishing a support. In order to establish a support in the case of thermal and / or chemical activation, it is necessary to prevent the microcapsules from breaking open accidentally during storage as a result of environmental influences such as ambient temperature, humidity and the like.

[0014] According to one embodiment, the adhesive component and the hardener component form an addition cross-linking system when they react with each other. An addition cross-linking system does not form low-molecular-weight cleavage products during cross-linking. The cross-linking of an addition cross-linking system is therefore essentially shrinkage-free, so that no gaps are formed in the seal seat as a result of the formation of the hardened adhesive layer. An addition cross-linking system comprising an adhesive component and a hardener component can therefore ensure that the seal seat is substantially completely sealed by the hardened adhesive layer.

[0015] According to one embodiment, the support material comprises a polymer, in particular a synthetic resin, for example a polyurethane, an epoxy resin, a silicone resin or another elastomeric resin. In particular, the support material has at least one component which is designed to react with the component contained in the microcapsules, in particular to form a cross-linking. In other words, it can be said that the support material preferably comprises either the adhesive component or the hardener component, and the other of the two components is embedded in the support material in the form of microcapsules, and a reaction between the reaction component contained in the support material and the component contained in the microcapsules takes place when the coating is activated, i.e. when the microcapsules break open, so that in particular a cross-linking with the support material is formed, by means of which the adhesive layer is formed. However, it is also conceivable that the support material is passively designed with respect to the reaction of the adhesive component and the hardener component to form the adhesive layer. This means that the support material is an already hardened material, for example a completely reacted resin, elastomer or thermoplastic, and the adhesive component and the hardener component are each in the form of microcapsules and react with each other by activation of the coating, i.e. when the microcapsules break open, to form the adhesive layer. In particular, such a passive support material is not brittle. In other words, it can be said that the passive support material has a certain toughness.

[0016] A further object of the present application is a wheel bearing unit for a vehicle. The wheel bearing unit has a wheel bearing and a sealing arrangement for sealing the wheel bearing. The wheel bearing has a stationary outer ring with an outer ring raceway, a rotatable inner ring with an inner ring raceway, and a plurality of rolling elements arranged between the inner ring and the outer ring such that the rolling elements roll along the inner ring raceway and the outer ring raceway when the inner ring rotates relative to the outer ring. The sealing arrangement has a sealing unit and a slinger disc. The sealing unit has a sealing support and a sealing element arranged on the sealing support. The sealing support is integrally connected to the outer ring of the wheel bearing such that an outer peripheral surface of the sealing support and an inner peripheral surface of the outer ring form a first sealing seat, in particular a first static sealing seat. The slinger disc is integrally connected to the inner ring of the wheel bearing such that an inner peripheral surface of the slinger disc and an outer peripheral surface of the inner ring form a second sealing seat, in particular a second static sealing seat. The outer peripheral surface of the sealing support and / or the inner peripheral surface of the slinger disc has an activatable coating for sealing the respective, in particular static, sealing seat, wherein the coating has a binder component and a hardener component. The binder component and / or the hardener component is embedded as microcapsules in a support material of the coating. The first sealing seat and / or the second sealing seat is sealed by a binder layer which is formed by activation of the coating during mounting of the sealing arrangement in the wheel bearing.

[0017] The activatable coating allows to initiate the reaction between the binder component and the hardener component only after the sealing arrangement has been mounted in the wheel bearing of the wheel bearing unit. This makes it possible to determine the dosage of the binder component and the hardener component by means of a layer thickness of the coating applied to the sealing arrangement, so that it is possible to reduce or even prevent undesirable binder residues which can arise by the formation of a hardened binder layer. This makes it possible to achieve a clean mounting process and a clean wheel bearing unit. In addition, the mounting process can be simplified compared to known processes, since a separate hardening of the binder layer is no longer necessary.

[0018] According to one embodiment, the inner peripheral surface of the outer ring and / or the outer peripheral surface of the inner ring has an activatable coating for sealing the sealing seat at least in the region of the respective, in particular static, sealing seat. In addition to or as an alternative to the coating on the sealing arrangement, an activatable coating on the wheel bearing can be provided. By applying an activatable coating to the wheel bearing, the wheel bearing can be combined with a sealing arrangement which does not have such a coating, whereby the leakage behavior of the static sealing seat is improved.

[0019] According to one embodiment, the adhesive layer is formed as an addition crosslinking system. Addition crosslinking systems do not form low-molecular-weight cleavage products during crosslinking. Thus, the crosslinking of addition crosslinking systems is essentially shrinkage-free, so that no gaps are formed in the sealing seat due to the formation of the hardened adhesive layer. Thus, the addition crosslinking system comprising the adhesive component and the hardener component can ensure that the sealing seat is substantially completely sealed by the hardened adhesive layer.

[0020] Another aspect of the application relates to the use of an activatable coating for sealing a sealing seat, in particular a static sealing seat, in a wheel bearing unit of a vehicle, wherein the coating has an adhesive component and a hardener component. The adhesive component and / or the hardener component are embedded as microcapsules in a support material of the coating, and an adhesive-hardener mixture is formed by activation of the coating, which mixture hardens to form an adhesive layer / adhesive connection.

[0021] The activatable coating allows the reaction between the adhesive component and the hardener component to be initiated only after the sealing arrangement has been installed in the wheel bearing of the wheel bearing unit. This makes it possible to determine the dosage of the adhesive component and the hardener component by means of the layer thickness of the coating applied to the sealing arrangement, so that it is possible to reduce or even prevent undesirable adhesive residues that can arise from the formation of the hardened adhesive layer. This makes it possible to achieve a clean installation process and a clean wheel bearing unit. In addition, the installation process can be simplified compared to known processes, since separate hardening of the adhesive layer is no longer necessary.

[0022] Another aspect of the application relates to a method for sealing a sealing seat, in particular a static sealing seat, in a wheel bearing unit of a vehicle, wherein the wheel bearing unit has a wheel bearing and a sealing arrangement. The method comprises the following steps:

[0023] applying an activatable coating to a circumferential surface of the sealing arrangement and / or a circumferential surface of the wheel bearing, which circumferential surfaces form a sealing seat, in particular a static sealing seat, of the wheel bearing unit, wherein the coating comprises an adhesive component and a hardener component, wherein the adhesive component and / or the hardener component are embedded as microcapsules in a support material of the coating,

[0024] activating the coating,

[0025] forming an adhesive-hardener mixture, in particular a reactive adhesive-hardener mixture, and

[0026] forming an adhesive layer that seals the respective sealing seat by hardening the adhesive-hardener mixture.

[0027] The activatable coating can be applied before mounting the sealing arrangement in the bearing, in particular in the wheel bearing of a wheel bearing unit, and the mounting does not necessarily have to be carried out essentially directly after applying the coating. In other words, the coating makes it possible to establish the support of the sealing arrangement and / or of the wheel bearing with the applied coating without having to worry about the coating hardening. Furthermore, the coating can be applied mechanically and thus economically. In addition, a predetermined layer thickness can be selected and applied, which can reduce or even avoid the risk of incorrect dispensing of the adhesive component and the hardener component. Furthermore, by applying the coating, the position of the coating and thus of the adhesive component can be selected. In other words, it can be said that the coating can be applied essentially precisely at the desired location.

[0028] The activation of the coating causes the microcapsules to burst open, thereby allowing the adhesive component and the hardener component to come into contact with each other, mix and harden together to form the adhesive layer. The targeted activation of the coating and thus the targeted bursting open of the microcapsules makes it possible to specifically select the start of the reaction between the adhesive component and the hardener component, which makes it possible to form the hardened adhesive layer.

[0029] According to one embodiment, the coating is activated thermally, for example when a predetermined temperature is reached, chemically, for example by a chemical reaction with another substance, or mechanically, for example by applying a mechanical load or under the action of a mechanical load.

[0030] In particular, the mechanical activation, for example by applying a predetermined mechanical load, such as a mounting force when inserting or pressing the sealing support or the slinger disc into the wheel bearing, on the shaft or into the housing, etc., is particularly suitable for establishing the support. In order to establish the support in the case of thermal and / or chemical activation, it is necessary to prevent the microcapsules from accidentally bursting open during storage due to environmental influences such as ambient temperature, humidity, etc. BRIEF DESCRIPTION OF DRAWINGS

[0031] Further measures to improve the application are shown in more detail below on the basis of the description of preferred exemplary embodiments of the application together with the drawings. In the drawings:

[0032] Figure 1 A schematic representation of a wheel bearing unit according to one embodiment of the application is shown.

[0033] Figure 2a A schematic partial representation of an inner ring of a wheel bearing of a wheel bearing unit according to one embodiment of the application is shown.

[0034] Figure 2b A schematic partial representation of a slinger disc of a sealing arrangement according to one embodiment of the application is shown, and

[0035] Figure 3A schematic flow chart representation of a method for sealing a sealing seat in a wheel bearing unit of a vehicle is shown.

[0036] The drawings are essentially schematic and are merely intended to provide an understanding of the application. Identical elements are provided with the same reference signs. DETAILED DESCRIPTION

[0037] Figure 1 A schematic cross-sectional view of a part of an exemplary wheel bearing unit 1 according to an embodiment of the application is shown. The wheel bearing unit 1 has a wheel bearing 2 and a sealing arrangement 3. The wheel bearing 2 has an inner ring 4, an outer ring 5 and rolling elements 6 arranged to roll between the inner ring 4 and the outer ring 5. The inner ring 4 is coupled in conjunction with a rotatable wheel hub (not shown) and the outer ring 5 is coupled in conjunction with a stationary element, e.g. a housing part (not shown).

[0038] The sealing arrangement 3 is arranged in a gap between the inner ring 4 and the outer ring 5 and is designed to reduce or prevent the ingress of dust particles, such as dirt particles, water, mud, etc. into a rolling element chamber 7 of the wheel bearing 2 in which the rolling elements 6 are arranged. The sealing arrangement 3 has a sealing unit 8 and a slinger disc 9, wherein the sealing unit 8 has a sealing support 10 and a sealing element 11.

[0039] The sealing unit 8 is coupled in an axially fixed manner with the outer ring 5 for co-rotation, wherein an outer peripheral surface 12 of the sealing support 10 is in contact with an inner peripheral surface 13 of the outer ring 5 and forms a first sealing seat 14, which can also be denoted as a first static sealing seat 14. The slinger disc 9 is coupled in an axially fixed manner with the inner ring 4 of the wheel bearing 2, wherein an inner peripheral surface 15 of the slinger disc 9 is in contact with an outer peripheral surface 16 of the inner ring 4 and forms a second sealing seat 17, which can also be denoted as a second static sealing seat 17. The first sealing seat 14 and the second sealing seat 17 are each sealed by an adhesive layer 18.

[0040] The adhesive layer 18 is formed by activating an activatable coating 19 applied to the sealing arrangement 3 or the wheel bearing 2 prior to the sealing arrangement 3 being installed in the wheel bearing 2. In particular, the activatable coating 19 for forming the adhesive layer 18 in the first sealing seat 14 can be provided on the outer peripheral surface 12 of the sealing support 10 and / or on the inner peripheral surface 13 of the outer ring 5. For forming the adhesive layer 18 in the second sealing seat 17, the activatable coating 19 can be provided on the inner peripheral surface 15 of the slinger disc 9 and / or on the outer peripheral surface 16 of the inner ring 4. Reference is made to the following Figure 2a and Figure 2b The activatable coating 19 and the formation of the adhesive layer 18 are described in more detail.

[0041] Figure 2a andFigure 2b The activatable coating 19 is shown as it is during the installation of the sealing arrangement 3 in the wheel bearing 2, i.e. during the activation of the activatable coating 19, for example in the second sealing seat 17, wherein Figure 2a The coating 19 in Figure 2b is provided on the outer circumferential surface 16 of the inner ring 4 by way of example only, and Figure 2b The coating in Figure 2a is provided on the inner circumferential surface 15 of the slinger disc 9 by way of example only. The activatable coating 19 comprises a binder component 20, a hardener component 21 and a support material 22, the binder component 20 and the hardener component 21 being received, i.e. embedded and / or mixed, in the support material.

[0042] Before the activation of the coating 19, the hardener 21 is received in the activatable coating 19 in microcapsules 23, the microcapsules being Figure 2a and Figure 2b shown as being broken open. This means that before the coating 19 is activated, the hardener component 21 is coated, for example with a polymer shell forming the microcapsules 23, thereby preventing contact or mixing between the hardener component 21 and the binder component 20. When the microcapsules 23 are broken open, the hardener component 21 is released and comes into contact with the binder component 20, thereby forming a reactive binder-hardener mixture which hardens to form the binder layer 18.

[0043] The microcapsules 23 are broken open by the activation of the coating 19. In Figure 2a and Figure 2b , the activation of the coating 19 is triggered mechanically, by way of example, by the installation of the slinger disc 9 on the inner ring 4, thereby applying a force or load to the coating 19 which causes the microcapsules 23 to break open. Additionally or alternatively, a thermal and / or chemical activation of the coating 19 is also possible. The broken open microcapsules 23, for example the broken polymer shell, act as a filler in the binder layer 18 formed thereby reducing or even eliminating the porosity in the binder layer 18. The lower the porosity of the binder layer 18, the higher or better the leakage behaviour of the sealing seat 14 or 17. In other words, the lower the porosity of the binder layer 18, the higher the sealing of the sealing seat 14 or 17.

[0044] The support material 22 can be, for example, polyurethane, epoxy resin, silicone or another elastic resin. The adhesive component 20 and the hardener component 21 are chosen in particular such that the adhesive component and the hardener component additively crosslink and thus do not form low-molecular-weight cleavage products. This enables crosslinking substantially without shrinkage. This means that the dimensions of the adhesive layer 18 substantially correspond to the dimensions of the activatable coating 19. For example, the adhesive component 20 can be mixed with the support material 22 as a mixture of phenol and formaldehyde, for example as a novolak resin, a resol resin or a resole resin. Alternatively, the support material can be formed as an epoxy resin or a polyurethane, which is present together with the adhesive component 20, for example in the form of a novolak resin, a bisphenol epoxy resin, a phenolic epoxy resin, an aliphatic epoxy resin or as an isocyanate. The hardener component 21 matches the adhesive component 20 and can be, for example, hexamethylenetetramine for novolak-type phenolic resins, an amine hardener such as 1,3-diaminobenzene for epoxy resins or a fatty amine such as diethylenetriamine as well as a diol or triol for polyurethanes.

[0045] Although not shown here, the adhesive component 20 can also be provided in the activatable coating 19 as microcapsules 23 in addition to or as an alternative to the hardener component 21. The adhesive component 20 and the hardener component 21 are provided separately from one another in the microcapsules 23 in order to prevent the adhesive layer 18 from being formed prematurely, accidentally. Furthermore, it is conceivable to dispense with the sealing element 11 at least in the region of the first sealing seat 14, provided that the required sealing of the first sealing seat 14 has already been achieved by the adhesive layer 18.

[0046] Figure 3 A flowchart representation of an exemplary method 30 for sealing the sealing seats 14, 17 in a wheel bearing unit 1 of a vehicle is shown. The method 30 comprises the following steps:

[0047] applying an activatable coating 19 to the circumferential surfaces 12, 15 of the sealing arrangement 3 and / or to the circumferential surfaces 13, 16 of the wheel bearing 2, which form the sealing seats 14, 17 of the wheel bearing unit 1, wherein the coating 19 comprises an adhesive component 20 and a hardener component 21, wherein the adhesive component 20 and / or the hardener component 21 are embedded as microcapsules 23 in a support material 22 of the coating 19 (step S1),

[0048] activating the coating 19 (step S2),

[0049] forming an adhesive-hardener mixture (step S3), and

[0050] forming an adhesive layer 18 sealing the sealing seats 14, 17 by hardening the adhesive-hardener mixture (step S4).

[0051] List of reference signs

[0052] 1 wheel bearing unit

[0053] 2 wheel bearing

[0054] 3 sealing arrangement

[0055] 4 inner ring

[0056] 5 outer ring

[0057] 6 rolling element

[0058] 7 rolling element chamber

[0059] 8 sealing unit

[0060] 9 oil slinger disc

[0061] 10 sealing support

[0062] 11 sealing element

[0063] 12 outer peripheral surface of the sealing support

[0064] 13 inner peripheral surface of the outer ring

[0065] 14 first sealing seat

[0066] 15 inner peripheral surface of the oil slinger disc

[0067] 16 outer peripheral surface of the inner ring

[0068] 17 second sealing seat

[0069] 18 adhesive layer

[0070] 19 activatable coating

[0071] 20 adhesive component

[0072] 21 hardener component

[0073] 22 support material

[0074] 23 microcapsule

Claims

1. A sealing arrangement (3) for a wheel bearing unit (1) of a vehicle, the sealing arrangement comprising: a sealing unit (8) having a sealing carrier (10) and a sealing element (11) arranged on the sealing carrier (10), and wherein the sealing carrier (10) is designed to be integrally connected to an outer ring (5) of the wheel bearing unit (1) such that an outer peripheral surface (12) of the sealing carrier (10) and an inner peripheral surface (13) of the outer ring (5) form a first sealing seat (14), and a slinger disc (9) designed to be integrally connected to an inner ring (4) of the wheel bearing unit (1) such that an inner peripheral surface (15) of the slinger disc (9) and an outer peripheral surface (16) of the inner ring (4) form a second sealing seat (17), wherein the outer peripheral surface (12) of the sealing carrier (10) and / or the inner peripheral surface (15) of the slinger disc (9) has an activatable coating (19) for sealing the respective static sealing seat (14, 17), wherein the coating (19) has an adhesive component (20) and a hardener component (21), and wherein the adhesive component (20) and / or the hardener component (21) are embedded as microcapsules (23) in a carrier material (22) of the coating (19).

2. The sealing arrangement (3) according to claim 1, wherein The coating (19) is thermally and / or chemically and / or mechanically activatable.

3. The sealing arrangement (3) according to claim 1 or 2, wherein The adhesive component (20) and the hardener component (21) form an addition-crosslinking system.

4. The sealing arrangement (3) according to one of claims 1 to 3, wherein The carrier material (22) comprises a polymer.

5. A wheel bearing unit (1) for a vehicle, the wheel bearing unit comprising: a wheel bearing (2), and a sealing arrangement (3) for sealing the wheel bearing (2), wherein the wheel bearing (2) comprises a stationary outer ring (5) having an outer ring raceway, a rotatable inner ring (4) having an inner ring raceway, and a plurality of rolling elements (6) arranged between the inner ring (4) and the outer ring (5) such that the plurality of rolling elements rolls on the inner ring raceway and the outer ring raceway when the inner ring (4) rotates relative to the outer ring (5), and wherein the sealing arrangement (3) comprises a sealing unit (8) and a slinger disc (9), wherein the sealing unit (8) has a sealing carrier (10) and a sealing element (11) arranged on the sealing carrier (10), and wherein the sealing carrier (10) is integrally connected to the outer ring (5) of the wheel bearing (2) such that an outer peripheral surface (12) of the sealing carrier (10) and an inner peripheral surface (13) of the outer ring (5) form a first sealing seat (14), and wherein the slinger disc (9) is integrally connected to an inner ring (4) of the wheel bearing (2) such that an inner peripheral surface (15) of the slinger disc (9) and an outer peripheral surface (16) of the inner ring (4) form a second sealing seat (17), wherein the outer circumferential surface (12) of the sealing support (10) and / or the inner circumferential surface (15) of the slinger disc (9) has an activatable coating for sealing the sealing seat (14, 17), wherein the coating (19) comprises an adhesive component (20) and a hardener component (21), wherein the adhesive component (20) and / or the hardener component (21) are embedded as microcapsules (23) in a support material (22) of the coating (19), wherein the first sealing seat (14) and / or the second sealing seat (17) is sealed by an adhesive layer (18) which is formed by activating the coating (19) during mounting of the sealing arrangement (3) in the wheel bearing (2).

6. The wheel bearing unit (1) according to claim 5, wherein The inner circumferential surface (13) of the outer ring (5) and / or the outer circumferential surface (16) of the inner ring (4) has an activatable coating (19) for sealing the sealing seat (14, 17) at least in the region of the respective sealing seat (14, 17).

7. The wheel bearing unit (1) according to claim 5 or 6, wherein The adhesive layer (18) is formed as an addition-crosslinking system.

8. Use of an activatable coating (19) for sealing a seal seat (14, 17) in a wheel bearing unit (1) of a vehicle, wherein The coating (19) comprises an adhesive component (20) and a hardener component (21), wherein the adhesive component (20) and / or the hardener component (21) are embedded as microcapsules (23) in a support material (22) of the coating (19) and an adhesive-hardener mixture is formed by activating the coating (19), which mixture hardens to form an adhesive layer (18).

9. A method (30) for sealing a seal seat (14, 17) in a wheel bearing unit (1) of a vehicle, wherein The wheel bearing unit (1) has a wheel bearing (2) and a sealing arrangement (3), wherein the method comprises the following steps: An activatable coating (19) is applied to the circumferential surfaces (12, 15) of the sealing arrangement (3) and / or the circumferential surfaces (13, 16) of the wheel bearing (2), which circumferential surfaces form sealing seats (14, 17) of the wheel bearing unit (1), wherein the coating (19) comprises an adhesive component (20) and a hardener component (21), wherein the adhesive component (20) and / or the hardener component (21) are embedded as microcapsules (23) in a support material (22) of the coating (19), activating the coating (19), forming an adhesive-hardener mixture, and forming an adhesive layer (18) which seals the sealing seats (14, 17) by hardening the adhesive-hardener mixture.

10. The method (30) of claim 9, wherein, The coating (19) is activated thermally and / or chemically and / or mechanically. The coating (19) is activated thermally and / or chemically and / or mechanically.

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