Bypass device and rolling bearing device with a bypass device

Abstract

The invention relates to a bypass device (1) comprising a holder (2) and at least one electrically conductive bypass conductor (3), wherein the holder (2) and bypass conductor (3) are electrically conductively connected to one another, and the holder (2) serves to fasten the bypass conductor to a first machine element (11) and holds the bypass conductor (3). The bypass conductor (3) is formed from loop-stitched rovings (5) that are in contact with a second machine element (12). The bypass conductor (3) has at least one stiffening ring (8) that is stitched to the loop-stitched rovings (5) by means of a non-water-soluble yarn (21), and the conductive fibers of the loop-stitched rovings (5) themselves are stitched with a water-soluble yarn (22).

Description

Field of the invention

[0001] The invention relates to a bypass device, a rolling bearing device with a bypass device and a method for producing a bypass conductor for a bypass device. Background of the invention

[0002] In many applications, for example, between the rotor shafts and housings of electric motors and generators, unwanted voltage potentials often arise. If countermeasures are not taken, these voltage potentials can 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] 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.

[0004] Measures are already known in the expert world to prevent the build-up of voltage potentials or the reduction of these voltage potentials in machine elements that rotate relative to one another. 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 conductive material that has low resistance to flowing currents.The advantage of such a bypass device is that the shaft grounding ring is simple and inexpensive to manufacture.

[0005] Bypass conductors are also popular among experts in sealing devices. An example of a bypass seal is disclosed in DE 10 2014 010 269 B4. The bypass 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 seated in the housing with a holder formed from an angled sheet.

[0006] In general, rolling bearing manufacturers are interested in using such bypass conductors in the direct and immediate vicinity of the rolling bearings, which can be exposed to the damage described above due to the reduction of voltage potentials. Furthermore, the bypass conductors should be installed in the most space-saving manner possible. Therefore, such bypass conductors are integrated, for example, into the main seals of rolling bearings. Such a device is disclosed in DE 10 2015 224 044 A1. The main seal used in this device is filled with conductive filler.

[0007] With such an arrangement of bypass conductors, wear can often lead to abrasion of their components and thus to damage to rotating components, for example the bearing. Description of the invention

[0008] The object of the invention is to provide a bypass device with improved contact conditions and an improved rolling bearing device, which can be manufactured easily and cost-effectively, can be installed in a space-saving manner and releases little wear substances into the immediate environment.

[0009] The object is achieved with a bypass device according to claim 1, a rolling bearing device according to claim 5 or 6 and a manufacturing method according to claim 9 or 10.

[0010] The bypass device is provided for transmitting electrical currents to a rotating component, wherein the bypass device has a holder and at least one electrically conductive bypass conductor, and the holder and the bypass conductor are electrically conductively connected to one another. The holder serves to fasten the bypass conductor to a first machine element and holds the bypass conductor. The holder can have one or more retaining rings and one or more retaining disks. The bypass conductor is formed from loop-shaped, embroidered rovings and comprises conductive fibers, wherein the fibers of the rovings themselves are embroidered to ensure cohesion. The loop-shaped rovings are provided for contacting a second machine element. A roving is a bundle, strand, or multifilament yarn made of parallel arranged filaments or fibers.Parallel does not only mean straight, but of course also curved. The rovings are also knitted in a loop-like manner with one or more concentric or partially concentric stiffening rings. This not only ensures ideal fixation for assembly, but also allows them to be formed into a component that can ideally transmit electrical currents in rotating components. In the context of the invention, a stiffening ring does not necessarily mean a rigid ring, but rather an annular or partially annular reinforcement design that holds the bypass conductor in its circular shape and stiffens it. Thus, the stiffening ring can, on the one hand, literally be a rigid ring, but on the other hand, it can also take the form of one or more concentrically arranged rovings that connect the loop-shaped, knitted rovings and hold them in shape.The concentric or partially concentric stiffening ring is embroidered with the loop-shaped rovings using a non-water-soluble yarn, whereas the fibers of the loop-shaped rovings themselves are stitched together with a water-soluble yarn.

[0011] It has been found that loop-shaped stitching prevents wear of the individual fibers and is also particularly suitable for conditions involving lubricant contact. However, it has been discovered that the yarn that holds the loop-shaped stitched rovings together can impair conductivity. It would therefore be logical to use conductive yarn. Surprisingly, however, it has been shown that it is sufficient to maintain the cohesion of the loop-shaped stitched rovings only up to the point of connection with the stiffening ring. The water-solubility of the yarn surrounding the loops thus provides an ideal bypass conductor. A further advantage is that the abrasion of the yarn holding the loop-shaped stitched rovings together, which occurs due to wear, can be completely eliminated.However, it is also conceivable to ensure the cohesion of the fibers by the water-soluble yarn until final assembly, and to only release the yarn once it has been installed.

[0012] The water-soluble yarn that holds the fibers of the rovings together preferably comprises polyvinyl alcohol, also known as PVA or PVOH for short. This is particularly suitable because it holds the fibers together well, is easy to stitch, and can then be detached in a suitable manner.

[0013] In the context of this invention, water solubility means that a chemical substance is generally soluble in water, i.e., when water particles can penetrate between the substance particles and separate them. Other substances that cannot be dissolved in water as a solvent fall under the term "insoluble in water."

[0014] The looped, knitted rovings of the bypass conductor can, for example, be knitted in a meander shape with a stiffening ring. As mentioned above, such meander shapes are particularly suitable for conducting electrical currents despite lubricant contact. Furthermore, they create media-permeable openings, which are essential for wet applications, i.e., when the ambient lubricant must flow through the bypass device to lubricate a bearing or other machine component on the opposite side.

[0015] In an advantageous embodiment of the bypass device, the fibers of the loop-shaped, woven rovings of the bypass conductor comprise carbon or carbon derivatives. This material is particularly suitable because it exhibits conductive and sliding properties.

[0016] The aforementioned bypass device is suitable for any application in which the transmission of electrical currents to a rotating component is intended or should be intended, for example to mitigate damage to components caused by high voltage potentials. The bypass device is particularly suitable for use in a rolling bearing device consisting of at least one rolling bearing and a bypass device. The bearing rings are arranged concentrically on an axially aligned rotational axis of the rolling bearing and form the first and second machine elements. The rolling bearing is provided with rolling elements arranged radially between the bearing rings. At least one electrical connection is formed between the bearing rings via the bypass device. The holder of the bypass device is attached to one of the bearing rings and holds the bypass conductor. The bypass device is designed according to the above description.

[0017] It is also conceivable that the bypass device is used in a rolling bearing device which is formed from at least one rolling bearing and a bypass device as well as a third and a fourth machine element.

[0018] Here, too, the bearing rings are arranged concentrically on an axially aligned axis of rotation of the rolling bearing. The rolling bearing is provided with rolling elements arranged radially between the bearing rings, and at least one electrical connection is formed between the third machine element and the fourth machine element via the bypass device. In this context, machine elements are understood to be any elements that can be used to fasten a bearing ring. Examples of this are shafts, bolts, or even housings. The holder of the bypass device is fastened radially between one of the bearing rings and the third or fourth machine element, to one of the bearing rings and holds the bypass conductor, with one of the bearing rings being fastened to the third or fourth machine element. This enables a particularly simple and space-saving option for fastening the bypass device.The bypass device is designed according to the previous description.

[0019] Furthermore, it is advantageous if the rolling bearing device also has a contact ring, for example in the form of a sleeve, which improves conductivity or reduces electrical contact resistance and sits on the bearing ring facing away from the holder of the bypass device or on the machine element to be contacted. This contact ring is contacted by the bypass conductor and thus enables current conduction. It is conceivable that this contact ring comprises, for example, a precious metal, carbon, or carbon derivatives. It is also conceivable that the conductivity is improved by means of a coating that reduces electrical contact resistance. It is also conceivable that the coating of the contact ring serves to reduce friction and thus wear.

[0020] One or more bypass devices are integrated into the rolling bearing device. The advantage of the invention is that the bypass conductor is integrated into the rolling bearing and yet is attached to the rolling bearing in such a way that it is attached radially not inside the rolling bearing but in the bearing seat - i.e. on the outside of the rolling bearing between a housing or a shaft or other machine elements and one of the bearing rings of the rolling bearing. No separate axial installation space is required for attaching the bypass conductor. The radial installation space is already available due to the dimensions of the rolling bearing. This has a particularly positive effect on applications in rolling bearing devices with rolling bearings of small diameter series, in which there is little radial and axial installation space between the bearing rings for accommodating seals and bypasses. The limited space can be fully utilized to accommodate the bypass device.The components for attaching the bypass conductor therefore do not have to be as delicate and can therefore often be manufactured more cost-effectively.

[0021] The bypass device consists of one or more holders and one or more electrically conductive bypass conductors. The holder sits in or on one of the bearing rings of the rolling bearing. It is thus integrated into the rolling bearing or into the bearing seat of the rolling bearing and can be located either on the inner or outer ring. The holder is a component of any design suitable for holding the bypass conductor in the rolling bearing.

[0022] The advantage is that the rolling bearing, including the bypass device, can be delivered as a single unit from the bearing manufacturer. This saves assembly time and storage space for both the customer and the bearing manufacturer. The properties of the bypass conductor can be precisely tailored to the bearing's contact resistance or discharge resistance.

[0023] The respective holder and the bypass conductor are electrically connected to each other. The holder is itself conductive, or the bypass conductor and the machine element are connected via a separate electrical conductor. Although not necessary due to the advantages of the proposed bypass conductor, a conductive sleeve can also be provided, as previously mentioned. Generally, the bypass device is designed so that voltage potentials are discharged via this bypass device and not via the rolling bearing.

[0024] Two machine elements are mounted so they can rotate relative to one another by means of the at least one rolling bearing. One of the machine elements or the other machine element is mounted so it can rotate about the rotational axis of the rolling bearing by means of the rolling bearing, or one or the other machine element is fixed to the housing. Alternatively, both machine elements are arranged so they can rotate relative to one another about the rotational axis of the rolling bearing. Machine elements are 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 gearbox, or any other machine elements suitable for being mounted on or against one another by means of rolling bearings.

[0025] In the cases considered, the rotational axis of the rolling bearing is always axially aligned, but can be horizontal, vertical, or obliquely oriented in space. Radial is perpendicular to the rotational axis.

[0026] The rolling bearing is used to rotatably support machine parts, elements and assemblies. To reduce friction, it has rolling elements which roll between the inner and outer rings, thus reducing friction in the rotating bearing. As already explained, the rolling bearing has an inner ring and / or an outer ring. Alternatively, the rolling bearing can have more than just an inner and / or outer ring. In addition, the bearing rings are also split and each have a raceway or part of a raceway. The inner ring usually has one or more outer raceways, and the outer ring has one or more inner raceways. The rolling elements rolling on the raceways can be balls or rollers. The balls or rollers are often guided and held in cages.The rolling elements of a rolling bearing are either arranged in a single row in the circumferential direction, one behind the other, or alternatively, the rolling bearing has several rows of rolling elements arranged side by side. Rolling bearings can also be axial bearings. In this case, both the inner and outer rings are the axial washers, which have axial raceways.

[0027] 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 bearing rings are usually made of bearing steel and touch each other at the raceways. The resulting contact zones are potential passageways for currents, where the dreaded discharges lead to the raceway damage described in the "Background of the Invention" chapter.

[0028] 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.

[0029] The holder can have one or more retaining rings and one or more retaining disks. It is conceivable for the holder or the retaining ring to be provided with at least one, preferably several, recesses distributed circumferentially around the rotational axis of the rolling bearing and extending axially continuously through a substantially radially extending and annular disk-shaped base body. The retaining disk engages in the recess with at least one retaining clip and is held on the base body. The bypass conductor is held axially between the electrically conductive retaining ring and the retaining disk. The retaining clip or clips are latched or hooked into the recess in a form-fitting and / or force-fitting manner. Such an arrangement is advantageously easy to assemble. The individual parts of the holder can be manufactured inexpensively from sheet metal.

[0030] It is conceivable to design the retaining element or retaining ring of the rolling bearing device such that it has a plurality of clamps distributed around the circumference of one of the bearing rings, or the retaining elements are such clamps. These clamps are arranged radially between the bearing ring and the machine element, for example, between the outer ring and a housing or between the inner ring and a shaft, and thereby axially overlap the bearing ring and radially engage behind the bearing ring. The clamps are elastically spring-loaded and are preloaded radially against one of the bearing rings between one of the machine elements and one of the bearing rings.

[0031] The advantage of this is that the zones on the bearing ring to which the retaining ring is attached, or against which the retaining elements are preloaded against the bearing ring, do not need to be finely machined, because the retaining elements are at least radially elastically preloaded against this zone. The elasticity of the individual retaining elements is ensured by the fact that they are separated from one another circumferentially around the rotational axis of the rolling bearing by the axially continuous recesses. This extends the retaining elements from a base on the retaining ring by a radially extending elastic lever. In conjunction with a snap-in geometry, the retaining element can bridge large tolerances when pressed on and is securely fixed axially and radially. The retaining rings are easy and cost-effective to manufacture from sheet metal or spring steel.

[0032] It is conceivable that one or more clamping elements or retaining clips formed on the retaining disk or separately, each one or more than one, engage in one of the recesses and hold the retaining disk and the retaining ring together in a form-fitting manner. The bypass conductor is clamped axially between the clamping element and the holder or between the retaining disk and the retaining ring. The clamping element can, for example, be a simple clip that is inserted into the recess, or the clamping element or retaining clip can be formed on the retaining ring of the holder. Clamping elements are clamped detachably or permanently to the retaining ring, and retaining clips, for example, are clipped or snapped into the recesses in a form-fitting manner and can, under certain circumstances, also be detachable again.

[0033] It is conceivable that the holder, in contact with one of the bearing rings, rests electrically conductively against one of the bearing rings. The holder is made of electrically conductive material or has a conductive coating or is provided with conductive elements. It is crucial that an electrically conductive connection is formed between the machine element and the holder, either via the electrically conductive bearing ring or in direct contact with the holder. The bearing ring is made of a conductive material or has an electrically conductive coating. In this case, it can generally be assumed that the electrical resistance of the bypass device is lower than the electrical resistance passing through the rolling contacts of the rolling bearing.

[0034] The rolling contacts are the contacts at which the rolling elements rest on the raceways during operation or when the respective rolling bearing is at a standstill. The rolling contact zones are thus the zones in which the rolling elements roll along the raceways of the bearing rings during operation of the rolling bearing. The electrically conductive connection for discharging the voltage potentials between the first and second machine elements is established by means of the bypass device. As already mentioned at the beginning, the machine elements can be housings or shafts, or alternatively, other machine parts. It is conceivable that the fourth machine element is formed integrally with the inner ring of the rolling bearing. Thus, it is not impossible that, for example, in the case of a cylindrical roller bearing, the raceway of the rolling elements is directly the shaft, which in this sense represents the bearing ring and the fourth machine element in one piece.

[0035] The rolling elements of the rolling bearings concerned by the invention can be guided between the bearing ring with or without cage(s). A cage has one or two side edges. Cages with only one side edge are crown- and / or comb-shaped, i.e. cage webs protrude axially from the side edge like the points of a crown or the teeth of a comb. The circumferentially adjacent gaps between the points or teeth are the pockets in which the rolling elements are accommodated. The developed configuration of the cages is designed in imaginary flat planes like a perforated strip for balls and ladder-shaped for rollers. In both cases, the cage webs connect two side edges running parallel to one another. The gaps which appear hole- or window-shaped in the flat planes are three-dimensional pockets formed circumferentially between the cage webs, in which the rolling elements are accommodated.

[0036] As mentioned above, gearbox manufacturers often struggle for every millimeter of installation space. This also affects the requirements for rolling bearings, which consequently need to be designed to be as axially space-saving as possible. The aforementioned measure also contributes to saving axial installation space. This advantage results from the fact that the retaining elements of the retaining ring overlap the bearing ring in the axial direction and engage behind it radially.

[0037] For manufacturing the above-mentioned bypass conductor for a bypass device, a method comprising the following steps is proposed: a) Provision of conductive fibers b) Knitting the rovings of conductive fibers with a water-soluble yarn c) Optional to steps a) and b) Provision of rovings of conductive fibers embroidered with water-soluble yarn d) Provision of at least one concentric stiffening ring e) Positioning of the rovings of conductive fibers in loop form g) Positioning of at least one concentric or partially concentric stiffening ring h) Stitching the concentric stiffening ring with the stitched rovings in loop form using a non-water-soluble yarn i) Dissolving the water-soluble yarn

[0038] Another method for manufacturing a bypass conductor for a bypass device is proposed as follows: a) Provision of conductive fibers b) Provision of at least one concentric stiffening ring c) Positioning of the rovings of conductive fibers in loop form d) Embroidery of the rovings of conductive fibers on a water-soluble embroidery cloth with a water-soluble yarn g) Positioning of at least one concentric or partially concentric stiffening ring h) Stitching the concentric stiffening ring with the stitched rovings in loop form using a non-water-soluble yarn i) Dissolving the water-soluble yarn and, if applicable, the water-soluble embroidery cloth Description of the drawings

[0039] The invention is explained in more detail below using exemplary embodiments. They show: - Fig. 1 - a representation of the basic structure of the bypass device 1; - Fig. 2 - a representation of the bypass conductor 3 with loop-shaped embroidered rovings 5; - Fig. 3 - a detailed view of the looped rovings 5 ​​of the bypass conductor 3; - Fig. 4 - a rolling bearing arrangement 20 in a partial section along the rotation axis 16;

[0040] Fig. 1 - The bypass device 1 comprises a holder 2 and an electrically conductive bypass conductor 3. The bypass conductor 3 can be held by means of a holding disc 4 or holding elements 4 formed from the holder 2. The holder 2 serves to fasten the bypass conductor to a first machine element, which is Fig. 1 is not shown in detail. The bypass conductor 3 is in Fig. 1 is shown only in its basic position, but not in its intended configuration, i.e., consisting of loops. The bypass device 1 serves to transmit electrical currents to a rotating component that rotates about the rotation axis 16. It is also conceivable, although usually implemented differently, that the bypass device is arranged on the rotating machine element.

[0041] Fig. 2 - Fig. Figure 2 shows the basic structure of the bypass conductor 3, which is formed from loop-shaped, interwoven rovings 5. The bypass conductor 3 is shown schematically with regard to its structure. The loop-shaped, interwoven rovings 5 ​​of the bypass conductor 3 can be interwoven in a meander shape. The loops 6 are formed toward the bypass conductor center M. Furthermore, a concentrically arranged stiffening ring 8 in the form of an interwoven roving 7 is shown as an example, which serves to improve fiber cohesion.

[0042] Fig. 3 - A possible structure of the bypass conductor 3 is shown in the detailed view of the Fig. 3. Here, the bypass conductor 3, which is formed from loop-shaped embroidered rovings 5, has a stiffening ring 8, which in the illustrated case consists of two individual rings. It is conceivable that the stiffening ring 8 is also formed by just one ring. The loop-shaped embroidered rovings 5 ​​are provided in the contact area 18 for electrical and mechanical contact with a second, not shown machine element, wherein the concentric stiffening ring 8 of the bypass conductor is embroidered with the loop-shaped embroidered rovings 5 ​​by means of a non-water-soluble yarn 21. The individual fibers of the loop-shaped embroidered rovings 5 ​​are themselves embroidered with a water-soluble yarn 22, shown schematically.

[0043] Fig. 4 - The rolling bearing device 9 is formed from a rolling bearing 10, the bypass device 1, as well as a third machine element 13 and a fourth machine element 14. The rolling bearing 10 has a first machine element 11 in the form of a first bearing ring 25 and a second machine element 12 in the form of a second bearing ring 26 or a contact ring 19, wherein the bearing rings 25, 26 are arranged concentrically on an axially aligned rotational axis 16 of the rolling bearing 10. The rolling bearing 10 is provided with rolling elements 17 arranged radially between the bearing rings 25, 26. At least one electrical connection is formed between the first bearing ring 25 and the second bearing ring 26 or the third machine element 13 and the fourth machine element 14 via the bypass device 1.The holder 2 of the bypass device 1 is fastened radially between one of the bearing rings 25, 26 and the third or fourth machine element 13, 14 to one of the bearing rings 25, 26 and holds the bypass conductor 3. The holder 2 can be formed in one piece, for example by bent holding elements 4 that hold the bypass conductor 3, or can have a further component 20 that holds the bypass conductor 3. One of the bearing rings 25, 26 can be fastened to the third or fourth machine element 13, 14, wherein in . Fig. 4, the bearing ring 25 is attached to the first machine element 11. It is conceivable that the fourth machine element 14 is formed integrally with the inner ring 26 of the rolling bearing. Thus, it is not excluded that, for example, in the case of a cylindrical roller bearing or a cylindrical roller set, the raceway of the rolling elements is directly the shaft 15, which, in this sense, then represents the bearing ring 26 and the fourth machine element 14 in one piece. Fig. 4 also shows that the bypass conductor 3 contacts a contact ring 19 which improves conductivity for current transmission. Reference symbol 1 bypass device 2 holders 3 bypass conductors 4 holding elements 5 loop-shaped embroidered rovings 6 loops 7 Concentrically arranged, knitted roving 8 stiffening ring 9 Rolling bearing device 10 rolling bearings 11 First machine element 12 Second machine element 13 Third machine element 14 Fourth machine element 15 Wave 16 Rotation axis of the rolling bearing 17 rolling elements 18 Electrical contact area 19 Contact ring 20 additional components 21 Non-water-soluble yarn 22 Water-soluble yarn 23 - 24 - 25 First bearing ring (outer ring) 26 Second bearing ring (inner ring) M Center of the bypass conductor

Claims

[1] Bypass device (1) for transmitting electrical currents to a rotating component, wherein the bypass device (1) comprises a holder (2) and at least one electrically conductive bypass conductor (3), and wherein the holder (2) and bypass conductor (3) are electrically connected to each other, wherein the holder (2) serves to fasten the bypass conductor (3) to a first machine element (11) and holds the bypass conductor (3), wherein the bypass conductor (3) is formed from loop-shaped rovings (5) and comprises conductive fibers, wherein the loop-shaped rovings (5) are provided for contact with a second machine element (12), wherein the bypass conductor (3) has at least one stiffening ring (8), characterized bythat the at least one concentric stiffening ring (8) is embroidered with the loop-shaped embroidered rovings (5) by means of a non-water-soluble yarn (21) and the conductive fibers of the loop-shaped embroidered rovings (5) are themselves embroidered with a water-soluble yarn (22). [2] Bypass device (1) according to claim 1, characterized by that the water-soluble yarn (22) comprises polyvinyl alcohol. [3] Bypass device (1) according to claim 1, characterized by that the fibers (8) of the loop-shaped rovings (5) of the bypass conductor (3) are formed in a meander shape. [4] Bypass device (1) according to claim 1 or 2, characterized by that the fibers (8) of the loop-shaped rovings (5) of the bypass conductor (3) comprise carbon or derivatives of carbon. [5] Rolling bearing device (9) formed from at least one rolling bearing (10) and a bypass device (1), wherein: the bearing rings (25, 26) are arranged concentrically on an axially aligned axis of rotation (16) of the rolling bearing (10), the rolling bearing (10) is provided with rolling elements (17) arranged radially between the bearing rings (25, 26), wherein at least one electrical connection is formed between the bearing rings (25, 26) via the bypass device (1), wherein the holder (2) is attached to one of the bearing rings (25, 26) and holds the bypass conductor (3), and the bypass device (1) comprises a bypass device (3) according to any one of claims 1-3. [6] Rolling bearing device (9) which is formed from at least one rolling bearing (10) and a bypass device (1) and also comprises a third machine element (13) and a fourth machine element (14), wherein: wherein the bearing rings (25, 26) are arranged concentrically on an axially aligned axis of rotation (16) of the rolling bearing (10), the rolling bearing (10) is provided with rolling elements (17) arranged radially between the bearing rings (25, 26), wherein at least one electrical connection is formed between the third machine element (13) and the fourth machine element (14) via the bypass device (1), wherein the holder (2) is fixed radially between one of the bearing rings (25, 26) and the third or fourth machine element (13, 14) to one of the bearing rings (25, 26) and holds the bypass conductor (3), wherein one of the bearing rings (25, 26) is fixed to the third or fourth machine element (13, 14), and the bypass device (1) comprises a bypass conductor (3) according to any one of claims 1-3. [7] Rolling bearing device (1) according to the preceding claim, characterized bythat the holder (2) is fixed radially between the first bearing ring (25) and the third machine element (13) and the fourth machine element (14) is formed integrally with the second bearing ring (26). [8] Rolling bearing device (1) according to claims 4 to 6, characterized by that the bypass conductor (3) contacts a contact ring (19) which improves conductivity for current transmission. [9] A method for producing a bypass conductor for a bypass device according to claims 1 to 4, comprising the steps a) Provision of conductive fibers b) Knitting the rovings of conductive fibres with a water-soluble yarn (22) c) Optionally to steps a) and b) providing rovings of conductive fibers embroidered with water-soluble yarn (22) d) Provision of at least one concentric or partially concentric stiffening ring (8) e) Positioning of the rovings of conductive fibers in loop form g) Positioning of at least one concentric or partially concentric stiffening ring (8) h) Stitching the concentric stiffening ring (8) with the stitched rovings (5) in loop form using a non-water-soluble yarn (21) i) Dissolving the water-soluble yarn (22) [10] A method for producing a bypass conductor for a bypass device according to claims 1 to 4, comprising the steps a) Provision of conductive fibers b) Provision of at least one concentric stiffening ring (8) c) Positioning of the rovings of conductive fibers in loop form d) Embroidery of the rovings of conductive fibers onto, or with a water-soluble embroidery cloth with a water-soluble yarn (22) g) Positioning of at least one concentric or partially concentric stiffening ring (8) h) Stitching the concentric stiffening ring (8) with the stitched rovings (5) in loop form using a non-water-soluble yarn (21) i) dissolving the water-soluble yarn (22) and, if applicable, the water-soluble embroidery cloth

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