Rolling bearing arrangement

Abstract

The invention relates to a rolling bearing arrangement (1) which is formed from at least one cylindrical roller set (5), a static inner bearing ring (7), a rotatable outer bearing ring (2), and a bypass device (20), and which also has a first machine element (30) and a second machine element (31). At least one electrical connection is formed between the first machine element (30) and the second machine element (31) via the bypass device (20). The bypass device (20) has a holder (21) and at least one electrically conductive bypass conductor (23), the holder (21) and the bypass conductor (23) being electrically conductively connected to one another.A bearing gap (19) is formed between the inner bearing ring (7) and the outer bearing ring (2), which has a contact area (14) formed on the outer bearing ring (2) radially inward in the direction of the bearing gap (19), and on which the electrical contact between the bypass conductor (23) and the bearing ring is formed. The holder (21) holds the bypass conductor (23) and is also axially fastened by means of a positive fit between the inner bearing ring (2) and against a shoulder (4) in the first machine element (30). There, the bypass conductor (23) makes radial contact with the contact area (14).

Description

Field of the invention

[0001] The invention relates to a rolling bearing arrangement which is formed from at least a first and a second machine element, a cylindrical roller set, two bearing rings and a bypass device. Background of the invention

[0002] Rotor shafts in electrical machines are usually supported by rolling bearings. Unwanted voltage potentials often arise between the rotor shafts and housings of electric motors and generators. If countermeasures are not taken, these voltage potentials discharge through the rolling bearings. The current flowing through the affected rolling bearing can generate sparks in the rolling contact between the rolling elements and the raceways. The rolling raceways are damaged by melt pits or erosion pits.

[0003] Measures are already known to prevent the buildup or reduction of voltage potentials across the rolling bearings. For example, bypass devices are used, with which discharges are guided "around" the rolling bearings of the electric motor via so-called shaft grounding rings. DE 10 2016 010 926 A1 discloses such a bypass device consisting of a shaft grounding ring. This shaft grounding ring has a disk-shaped, electrically conductive bypass conductor, which is clamped towards the housing between two conductive angle plates and which rests against a shaft with elastic prestress on the inside. The angle plates forming the holder for the bypass conductor are inserted into a housing at any suitable location. The bypass conductor is made of a conductive material that has a lower resistance to flowing currents than, for example, steel.The advantage of such a bypass device is that the shaft grounding ring is simple and inexpensive to manufacture.

[0004] In the automotive sector, bypass conductors are also often integrated into sealing devices. An example of an upstream seal designed as a bypass conductor is disclosed in DE 10 2014 010 269 B4. The upstream seal is connected in series upstream of a main seal and, as a bypass conductor, simultaneously establishes an electrically conductive connection between two machine elements. The disc-shaped bypass conductor also protects the sealing lip of the main seal against environmental contaminants and is attached to the main seal. The main seal is mounted in the housing with a holder formed from an angled sheet.

[0005] Due to their primary application in electric motors and the resulting requirement for high relative speeds, the aforementioned bypass devices proposed in the prior art are generally used with ball bearings. The bypass devices are either provided within the bearing or are located at any point on the shaft. Due to their design characteristics, cylindrical roller bearings are more suitable for higher loads and lower speeds and are generally used in industrial applications. Since the currents are greater in these applications, bypass devices for these applications can be arranged anywhere in the system, contacting the shaft. Description of the invention

[0006] The object of the invention is to provide an improved rolling bearing arrangement with bypass for higher-speed cylindrical roller bearings.

[0007] The object is achieved according to the subject matter of claim 1. The rolling bearing assembly has at least a first machine element and a second machine element, a cylindrical roller set, a static inner and a rotatable outer bearing ring, and a bypass device. The cylindrical roller set comprises a plurality of cylindrical rollers. The cylindrical rollers of the cylindrical roller set are arranged radially between the inner and outer bearing rings and are directed radially transversely to the axis of rotation; the bearing ring is arranged concentrically on an axially aligned axis of rotation of the rolling bearing assembly. At least one electrical connection is formed between the first machine element and the second machine element via the bypass device. The bypass device has a holder and at least one electrically conductive bypass conductor, which are conductively connected to one another.The holder is fastened by means of a positive fit between the inner bearing ring and the first machine element and holds the bypass conductor. The holder is also fastened axially by means of a positive fit between the inner bearing ring and a shoulder in the first machine element, wherein the inner bearing ring is fastened to the first machine element. A bearing space is formed between the inner bearing ring and the outer bearing ring, wherein a contact area is formed on the outer bearing ring radially inward in the direction of the bearing space, i.e. on the inner diameter of the outer bearing ring, at which the electrical contact between the bypass conductor and the bearing ring is formed, wherein the bypass conductor makes radial contact with the contact area.

[0008] Bypass devices are typically mounted on the outer bearing ring of a rolling bearing and rest more or less overlapping against the inner bearing ring to ensure permanent mechanical and electrical contact. This has the advantage that tolerances can be designed generously. Surprisingly, it has been shown that permanent contact, in an even improved form of a bypass conductor, can also be created in the bearing space located on the rotating inner bearing ring in bearings with rotating outer rings, if the contact is made on the outer bearing ring, specifically on its inner diameter. This ensures reliable and permanent contact between the outer bearing ring and the bypass conductor.

[0009] A particularly secure and simple attachment of the bypass device can be achieved if the holder is secured by means of a positive fit between the inner bearing ring and the first machine element. This eliminates the need for complex mounting geometries. This also has the advantage that only minimal axial space is required for the bypass device.

[0010] It is also particularly suitable if the holder of the bypass device is designed in two parts and comprises a retaining disc and a clamping disc that hold the bypass conductor. This allows even inherently unstable bypass conductors, i.e., those without reinforcement elements, to be accommodated particularly well by the holder.

[0011] A particularly secure and simple attachment of the bypass device can be achieved if the bypass device holder also engages radially into a groove-shaped undercut between the inner bearing ring and the first machine element. This makes the attachment particularly space-saving, and only minimal axial space is required for the bypass device to ensure ideal positioning in the seating area.

[0012] The bypass device is arranged in the axial direction on one side of the rolling elements. On this side, the outer bearing ring preferably has a greater axial extent than on the opposite side in order to accommodate the bypass device. If the ribs are provided on the outer ring, the rib on the side of the bypass device can have a greater axial extent. It may be suitable to design the outer bearing ring such that it is flush with the bypass device on a plane YZ oriented perpendicular to the direction of rotation X. However, it is also conceivable that the maximum axial extent of the outer bearing ring is even greater than that of the shoulder of the first machine element for forming the positive connection between the bypass holder and the first machine element.

[0013] At least one electrical connection is established via the bypass device at least between the first and second machine elements. The design of the bypass device is focused exclusively on electrical conductivity and the installation situation, but not on a sealing function. When integrating bypass conductors into sealing systems, compromises must be made regarding the material properties of the seals and also the bypass conductor. When designing the bypass conductor of a bypass device, it is advantageous to consider only the requirements for electrical conductivity and wear resistance when selecting and designing the material.

[0014] The bypass device consists of a holder and an electrically conductive bypass conductor. The holder is any component designed to hold the bypass conductor in the rolling bearing. The properties of the bypass conductor can be precisely tailored to the bearing's contact or discharge resistance.

[0015] As mentioned above, the holder and the bypass conductor are electrically connected to each other, with the holder itself usually being conductive. Generally, the bypass device is designed so that voltage potentials are discharged via this bypass device and not via the cylindrical roller set.

[0016] Two machine elements are mounted rotatably relative to one another by at least one cylindrical roller set. In this case, the second machine element is mounted rotatably about the rotational axis of the rolling bearing by means of the cylindrical roller set, while the first machine element is designed to be static, i.e., non-rotatable. Machine elements are generally shafts, for example, rotor shafts of an electrical machine; housings, for example, bearing shields or housings or housing sections or bearing shields of an electrical machine; gears or shafts or housings of a transmission; or any other machine elements suitable for being mounted on or against one another by means of rolling bearings.

[0017] In the cases considered, the rotation axis of the cylindrical roller set is always axially aligned. Radial is perpendicular to the rotation axis.

[0018] The cylindrical roller set is used for the rotatable mounting of machine parts, elements and assemblies and has cylindrical rolling elements to reduce friction, which roll between the inner and outer bearing rings and thus reduce friction in the rotatable bearing.

[0019] The cylindrical roller set can have a cage to guide the rolling elements and, as already mentioned, is installed with an inner and an outer bearing ring to form a rolling bearing. Alternatively, the rolling bearing can also have more than just an inner and / or outer ring. In addition, the bearing ring, or the bearing rings, are alternatively split and have a raceway or part of a raceway. One or more outer raceways are formed on the radially inner contact partner, i.e. the inner ring, and one or more inner raceways are formed on the outer ring. The rolling elements rolling on the raceways are roller-shaped bodies. The rollers are, as already mentioned, often guided and held in cages. The rolling elements are either arranged in a row one behind the other in the circumferential direction or, alternatively, the arrangement comprises several rows of rolling elements arranged side by side. The bearing rings can be designed with or without rims.

[0020] In the context of the invention, a bypass is understood to mean the redirection of a current or voltage around one or more rolling bearings and / or machine parts. The rolling elements and the bearing ring are usually made of rolling bearing steel and touch each other at the raceway(s). The contact zones formed are potential passageways for currents, where the dreaded discharges lead to the damage to the raceways already described in the "Background of the Invention" chapter.

[0021] The currents are to be redirected through the bypass or bypass device. This can be "controlled" by ensuring that the bypass device, or in any case the bypass conductor, has comparatively lower electrical or specific electrical resistance than the rolling bearing.

[0022] It is conceivable that the cylindrical roller set on the inner bearing ring is insulated against the passage of current. For example, it is conceivable that an insulator or insulating layer is applied between the first machine element on / in which the bearing ring sits. The holder of the bypass device is connected to the first machine element by direct electrical contact, i.e., without an insulating layer or elements. It is conceivable that the rolling elements are made of a non-electrically conductive material such as ceramic. In this case, the bypass device only needs to redirect the current.

[0023] In a further preferred embodiment, especially for so-called "wet" applications, i.e. in which the lubricant of an entire system also serves as rolling bearing lubrication, the holder of the bypass device has media-permeable openings. These can be designed with different geometries and allow the passage of lubricant while simultaneously preventing excessive, damaging contact pressure of the bypass conductor on the second machine element in the event of pressure differences that may occur in the system. To ensure this, it may be necessary to provide these openings on certain elements, for example a holding disk and a clamping disk, in a two- or multi-part holder structure. This allows the lubricant to ideally pass through the bypass device.

[0024] In a further preferred embodiment, the retaining disc and the clamping disc are caulked to each other. The caulking creates media-permeable annular openings that are available on the holder during use. This is conceivable in the form of annular through-holes being created through the retaining disc and the clamping disc by means of the caulking. This is particularly advantageous because the discs of the holder can be manufactured, i.e., joined, particularly efficiently in this way, while simultaneously creating media-permeable through-holes.

[0025] It is also conceivable that, in a further preferred embodiment, the media-permeable openings simultaneously serve to make the holder elastic in such a way that it can clamp the bypass conductor particularly well.

[0026] Although any material and design for the bypass conductor is conceivable, it can be advantageous to form the bypass conductor from loop-shaped, embroidered fibers. The term "embroidered fibers" used below refers to both individual fibers and fiber pairs or fiber bundles. The term "embroidering" describes any joining of the fibers, fiber pairs, or bundles that uses an additional thread for connection. Sewing, crocheting, or similar can therefore be seen as equivalent. The bypass conductor formed in this way represents an ideal option for power transmission, even in contact with lubricants. In this respect, it also enables the lubricant to flow through without causing pressure differences in the bearing or in the overall system.

[0027] The looped, interwoven fibers of the bypass conductor of the rolling bearing assembly can contain carbon or carbon derivatives. These components are particularly suitable for conducting current in a bypass conductor of a rolling bearing assembly because they are characterized by high elasticity with a high elongation at break and very good electrical conductivity.

[0028] In a preferred embodiment, the contact region of the outer bearing ring, at which the bypass conductor contacts the outer bearing ring, comprises a galvanically applied layer system, wherein the layer system optionally comprises a first layer arranged on the outer bearing ring and at least one second layer arranged on the outer bearing ring or, if present, arranged on the first layer. The optional first layer is formed from copper or nickel, and the at least one second layer is formed from an alloy comprising at least two of the elements tin, copper, nickel, silver, zinc, bismuth, antimony, cobalt, manganese, tungsten, wherein non-metallic particles comprising electrically conductive particles are incorporated in the alloy.

[0029] Generally, coating of the counter-running surface, i.e., the contact surface, is omitted in bypass devices, as these are usually integrated into the existing system, for example, as the shaft of an electric motor or the bearing ring of a rolling bearing, and are therefore difficult to coat. Surprisingly, however, it has been found that a galvanically applied coating system as described above offers ideal properties as a contact surface for a bypass conductor. On the one hand, ideal, improved current transmission can be observed, even in the presence of lubricant layers.

[0030] Secondly, such a coating system exhibits ideal properties with regard to friction and wear. The proposed rolling bearing arrangement takes this as an opportunity to equip the contact surface with the aforementioned coating system, despite the aforementioned boundary condition.

[0031] The electrically conductive particles exhibit an electrical conductivity in a temperature range of 20 to 25°C in a range of 0.25 mΩ*cm*cm to 10 mΩ*cm*cm. The presence of non-metallic particles, which are embedded in the alloy in the second layer, improves the mechanical stability of the layer system and, depending on the material of the particles used, also enables a further reduction in the interfacial resistance and thus an increase in the current transfer capacity at the contact surface.

[0032] With regard to the electroplated layer system of the contact surface of the first machine element, an alloy is particularly preferably formed from a tin-nickel alloy with a nickel content in the range of 20 to 40 wt.%. Such a low nickel content is highly advantageous, since second layers made of such a tin-nickel alloy with electrically conductive particles dispersed therein, in particular of carbon and / or graphite and / or carbon nanotubes and / or carbon fibers and / or carbon black and / or graphene and / or graphene oxide, have proven to be more stable over the long term than comparable gold layers.

[0033] The alloy may also alternatively be formed from a copper-tin alloy or a tin-silver alloy or a tin-zinc alloy or a tin-bismuth alloy or a tin-antimony alloy or a tin-cobalt alloy or a nickel-tungsten alloy or a tin-manganese alloy.

[0034] In particular, SnCu has proven to be a high-performance material composition for a contact surface of a bypass device.

[0035] The first layer is made of copper or nickel. This ensures good adhesion of the coating system to the base material of the first machine element, i.e., the metal substrate.

[0036] The non-metallic particles preferably comprise a proportion of electrically conductive particles which bring about a significant reduction in the interfacial resistance on the component and are formed in particular from at least one material from the group comprising carbon, graphite, carbon nanotubes, carbon fibers, soot, graphene, graphene oxide, metal nitride, metal carbide.

[0037] The proportion of electrically conductive particles can, in particular, exceed 50% of the non-metallic particles. It has been shown that the electrically conductive particles protruding from the second layer maintain the electrical contact between the contact surface of the first machine element and the bypass conductor particularly reliably.

[0038] Particularly suitable for this application is a combination of a tin-nickel alloy with a nickel content in the range of 20 to 40 wt.% with dispersed non-metallic particles of at least one material from the group comprising carbon, graphite, carbon nanotubes, carbon fibers, carbon black, graphene, and graphene oxide. Although this alloy forms an oxide layer on its surface as a passivation, this layer is itself conductive and improves the starting behavior of machine elements that rotate relative to one another.

[0039] The non-metallic particles may further comprise a proportion of particles formed from a non-electrically conductive material, such as at least one material from the group comprising metal sulfide, metal oxide, diamond, mica, PTFE.

[0040] Preferred metal oxides are Al2O3, BeO2, CdO, MgO, SiO2, TiO2, ZrO2, Fe oxides, and the like. Preferred metal carbides are SiC, WC, VC, TiC, Cr2C3, Cr3C2, and the like. Preferred metal nitrides are BN or SiN, and the like. Carbon in the form of graphite, carbon nanotubes, carbon fibers, carbon black, graphene, or graphene oxide is particularly preferred. Preferred metal sulfides are MoS2, MoS, Ni-FeS2, and the like.

[0041] A particularly suitable particle size for the non-metallic particles is in the range from 100 nm to 8 µm, in particular in the range from 500 nm to 6 µm. Particular preference is given to using particles that are particularly stable in dispersing in an electrolyte for the electrodeposition of the second layer. In particular, the particle size is selected such that they protrude from the surface of the at least one second layer, thus ensuring contact with the counterbody.

[0042] A volume fraction of non-metallic particles in the second layer in the range of 1 to 50 vol.% is also particularly suitable. This ensures reliable bonding of the particles in the metallic matrix.

[0043] The optional first layer and the at least one second layer are formed by electroplating. Electroplating processes readily enable the deposition of electrolyte-tight layers with a layer thickness of up to 30 µm. This allows electroplated, conductive, and durable layers to be achieved on metallic substrates, such as rolling bearing steels or similar. The non-metallic particles are dispersed in an electrolyte to form the second layer and incorporated into the alloy deposited on the first layer to form the at least one second layer.

[0044] A single second layer or several second layers can be applied on top of each other.

[0045] In addition, electroplating can be performed using a so-called "pulse plating" process, in which the voltage applied to the electrolyte is periodically switched off or reversed. The brief current pulses received during switching on increase the formation of nuclei for metal deposition, thus creating a basis for fine-grained deposits and luster.

[0046] The first layer preferably has a layer thickness of up to 5 µm, in particular in the range of up to 3 µm. The at least one second layer preferably has a layer thickness of up to 30 µm, in particular in the range of 5 to 20 µm. The preferred total layer thickness of the layer system is <10 µm and is in particular in the range of 4 to 8 µm. Description of the drawings

[0047] The invention is explained in more detail below using exemplary embodiments. They show: - Fig. 1 - a partial section as an embodiment of a rolling bearing arrangement 1 in a partial section along the rotation axis 16; - Fig. 2 - a detailed view of the rolling bearing arrangement from Fig. 1 in an oblique partial section; - Fig. 3 - a section of the contact area of ​​the second machine element 31 from Fig. 1 in the sectional view in II;

[0048] Fig. 1 - The rolling bearing assembly 1 is formed from the cylindrical roller set 5, a static inner bearing ring 7 and a rotatable outer bearing ring 2, and a bypass device 20, and has a first machine element 30 and a second, schematically illustrated machine element 31. The second machine element 31 can be designed, for example, as a housing, and the first machine element 30, for example, as a shaft, as a hollow shaft 9. The cylindrical roller set 5 comprises a plurality of cylindrical rollers 8 and can have a cage 11. The bearing ring 2 is arranged concentrically on an axially aligned axis of rotation 16 of the cylindrical roller set 5. The cylindrical roller set 5 is provided with cylindrical rollers 8 arranged radially between the inner bearing ring 7 and the outer bearing ring 2, wherein the cylindrical rollers 8 are directed radially transversely to the axis of rotation 16.The bypass device 20 establishes an electrical connection between the first machine element 30 and the second machine element 31 via the outer bearing ring. The bypass device 20 has, in . Fig. 1 comprises a holder 21 and an electrically conductive bypass conductor 23, wherein the holder 21 and bypass conductor 23 are electrically connected to one another. The holder 21 is axially secured by means of a positive fit between the inner bearing ring 7 and a shoulder in the first machine element 30, wherein the inner bearing ring 7 is secured to the first machine element 30.

[0049] A bearing space 19 is formed between the inner bearing ring 7 and the outer bearing ring 2. On the outer bearing ring 2, a contact area 14 is formed radially inward in the direction of the bearing space 19, at which the electrical contact between the bypass conductor 23 and the outer bearing ring 2 is formed. In this area, the bypass conductor 23 radially contacts the contact area 14. The holder 21 of the bypass device 20 also engages radially in a groove-shaped undercut 28 between the inner bearing ring 7 and the first machine element 30. The groove-shaped undercut 28 is ideally a circumferential groove that exposes the area of ​​the holder 21 that overlaps with the inner bearing ring 7. Thus, the contact between the holder 21 and the inner bearing ring 7 takes place in the area of ​​the bearing shoulder 9 and between the holder 21 and the first machine element 30 on the radially inner side of the holder 21. The holder 21 is in Fig. 1 is formed in two parts, with a retaining disc 21.1 and a clamping disc 21.2 ensuring the secure mounting of the bypass conductor 23. As shown in the figure, the outer bearing ring 2 on side A of the bypass device 20 can have a greater extension in the axial direction than on the opposite side B.

[0050] Fig. 2 - The holder 21 of the bypass device 20 of the rolling bearing assembly 1 has Fig. 2 annular openings 24. This is particularly advantageous for so-called "wet" applications, i.e. in which the lubricant of an entire system also serves as rolling bearing lubrication. These annular openings 24 on the holder 21 represent media-permeable openings. These can be designed with different geometries, i.e. in different annular segments or sub-segments distributed over the circumference of the holder or as circular openings as in Fig. 2, and allow the passage of lubricant and at the same time prevent excessive, damaging contact pressure of the bypass conductor 23 on the second machine element 31 in the event of pressure differences that may occur in the system. Fig. Figure 2 also illustrates that the retaining disc 21.1 and the clamping disc 21.2 can be caulked to each other. The caulking creates media-permeable, annular openings 10 that are available on the holder 21 during use. Thus, the caulking creates circular through-holes 10 through the retaining disc 21.1 and the clamping disc 21.2.

[0051] Fig. 3 - Fig. 3 shows the contact area 14 of the second machine element 31 from Fig.1 in sectional view II. The base material 6 can be seen, here, for example, made of rolling bearing steel. The contact surface, or contact area 14, represents the area in contact with the bypass conductor 23. The first machine element 31 has a coating 3, which is galvanically coated with a first layer 3a of nickel, for example, with a layer thickness of 1 µm. On the first layer 3a there is a galvanically applied second layer 3b made of a tin-nickel alloy containing non-metallic graphite particles with a layer thickness in the range of, for example, 5 µm. Reference symbol 1 rolling bearing arrangement 2 Outer bearing ring 3 Coating 3a First layer 3b Second layer 4 paragraph in the first machine element 5 cylindrical roller sets 6 Base material 7 Inner bearing ring 8 cylindrical rollers 9 Bearing shoulder 10 ring-shaped openings created by caulking 11 Cage 12 - 13 - 14 Contact area 15 - 16 Rotation axis 17 - 18 - 19 Storage space 20 Bypass device 21 Bypass device holder 21.1 Retaining disc 21.2 Clamping disc 22 - 23 Bypass conductors 24 ring-shaped openings 25 - 26 - 27 - 28 - 29 - 30 first machine element 31 second machine element 32 - 33 - 34 - QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2016 010 926 A1

[0003] DE 10 2014 010 269 B4

[0004]

Claims

[1] Rolling bearing arrangement (1) which is formed from at least one cylindrical roller set (5), a static inner bearing ring 7 and a rotatable outer bearing ring (2) and a bypass device (20) and also comprises a first machine element (30) and a second machine element (31), wherein: - the cylindrical roller set (5) comprises a plurality of cylindrical rollers (8), and - the cylindrical rollers (8) of the cylindrical roller set (5) are arranged radially between the inner bearing ring (7) and the outer bearing ring (2), and are directed radially transversely to the rotation axis (16), - the inner bearing ring (7) and the outer bearing ring (2) are arranged concentrically on an axially aligned axis of rotation (16) of the rolling bearing arrangement (1), - at least one electrical connection is formed between the first machine element (30) and the second machine element (31) via the bypass device (20), - the bypass device (20) comprises a holder (21) and at least one electrically conductive bypass conductor (23), and wherein the holder (21) and bypass conductor (23) are electrically conductively connected to one another, - the holder (21) is axially fixed by means of a form fit between the inner bearing ring (2) and a shoulder in the first machine element (30) and holds the bypass conductor (23), - wherein the inner bearing ring (2) is attached to the first machine element (30), - wherein a bearing space (19) is formed between the inner bearing ring (7) and the outer bearing ring (2), - wherein a contact region (14) is formed on the outer bearing ring (2) radially inward in the direction of the bearing space (19), at which the electrical contact between the bypass conductor (23) and the outer bearing ring (2) is formed, - and wherein the bypass conductor (23) radially contacts the contact area (14). [2] Rolling bearing arrangement (1) according to one of the preceding claims, wherein the holder (21) of the bypass device (20) is formed in two parts, comprising a holding disc (21.1) and a clamping disc (21.2). [3] Rolling bearing arrangement (1) according to claim 1, wherein the holder (21) of the bypass device (20) also engages radially in a groove-shaped undercut (28) on the inner bearing ring (7) between the inner bearing ring (7) and the first machine element (30). [4] Rolling bearing arrangement (1) according to one of the preceding claims, wherein the outer bearing ring has a greater extension in the axial direction (A) of the bypass device (20) than on the opposite side (B). [5] Rolling bearing arrangement (1) according to one of the preceding claims, wherein the holder (21) of the bypass device (20) has media-permeable annular openings (10, 24). [6] Rolling bearing arrangement (1) according to claims 2 to 5, wherein the holding disc (21.1) and the clamping disc (21.2) are caulked to each other and media-permeable annular openings (10) are produced by the caulking. [7] Rolling bearing arrangement (1) according to one of the preceding claims, wherein the contact region (14) comprises a layer system (3) applied galvanically to the second machine element (31), wherein the layer system (3) optionally comprises a first layer (3a) arranged on the second machine element (5) and at least one second layer (3b) arranged on the second machine element (5) or, if present, on the first layer (3a), wherein the optional first layer (3a) is formed from copper or nickel and the at least one second layer (3b) is formed from an alloy comprising at least two of the elements tin, copper, nickel, silver, zinc, bismuth, antimony, cobalt, manganese, tungsten, wherein non-metallic particles comprising electrically conductive particles are incorporated in the alloy. [8] Rolling bearing assembly (1) according to claim 4, wherein the alloy of the second layer is formed from a tin-nickel alloy having a nickel content in the range of 20 to 40 wt.%.

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