DE102021123473A1 - Equipotential bonding arrangement and roller bearing arrangement - Google Patents

Abstract

The invention relates to a potential equalization arrangement (20), in particular for use in an electric machine (21) of a drive train (22) of a hybrid or all-electric motor vehicle (23), with a current-conducting element (8) which is in or on one of a lubricant (30) is arranged in an annular intermediate space (31) through which fluid can flow, the intermediate space (31) being defined by an outer cylinder component (4) and an inner cylinder component (3) accommodated in the outer cylinder component (4), and the current-conducting element (8) connects the outer cylinder component (4) to the inner cylinder component (3) in a current-conducting manner, with the current-conducting element (8) comprising a spring-elastic and electrically conductive clamp element (9) which is spring-elastic outwards in the radial direction and which is inserted into the outer cylinder component (4) under pretension is, wherein the clip element (9) has a first holding portion (10) and at least one second holding portion (13) au fwist, wherein between the first holding section (10) and the at least second holding section (13) an electrically conductive thread (11) extends through the gap (31) in such a way that it partially attaches to a first electrically conductive contact area (12) of the inner Cylinder component (3) rests.

Description

The present invention relates to a potential equalization arrangement, in particular for use in an electric machine of a drive train of a hybrid or all-electric motor vehicle, with a current-conducting element which is arranged in or on an annular intermediate space through which a lubricant can flow, the intermediate space being surrounded by an outer cylinder component and an inner cylinder member received in the outer cylinder member, and the conductive member electrically connects the outer cylinder member to the inner cylinder member. The invention also relates to a roller bearing arrangement.

When rolling bearings are used, e.g. in or on electrical machines or within a hybrid drive train of a motor vehicle, current leakage can occur. The switching pulses from converters, for example, lead to the build-up of voltage between the bearing rings of roller bearings. This voltage is repeatedly reduced by breakdowns. As a result, under unfavorable conditions, there is damage to the raceways and rolling elements due to the passage of current. There is therefore a risk of premature and unexpected failure of the bearing and thus of the entire electrical machine. In addition to the increased maintenance effort, additional costs arise due to the downtime of the machine.

Current-insulated roller bearings are known from the prior art, which are intended to prevent harmful bearing currents. For example, roller bearings with ceramic insulation on the outer or inner ring are used. However, current-insulated roller bearings are comparatively expensive and are therefore not used very often.

Particular challenges are presented by potential equalization arrangements through which a hydraulic fluid can flow, in which, for example, a roller bearing is arranged in a hydraulic path for supporting a rotor in the wet area of an electrical machine. The hydraulic fluid generally has a positive effect on minimizing friction and cooling components in the hydraulic path, but can also have a negative effect on electrical potential equalization between components.

In DE 10 2014 2024719 A1, for example, an electrically conductive disc is provided for potential equalization, the outer edge of which is fixed in a groove in the outer bearing ring of a roller bearing and thus creates a conductive connection between the outer bearing ring and the disc. The other edge of the disc is provided with a conductive brush, which rubs against the inner bearing ring during operation of the rolling bearing.

It is similar with KR 20180103802 A. There, however, a clip is used, the first contact section of which is in a current-conducting connection with the inner lateral surface of the outer bearing ring, which serves as the contact area, and the second contact section with the outer lateral surface of the inner bearing ring, which also serves as a contact section, in that a sloping middle section connects the both contact sections also electrically connects. If the inner bearing ring of this arrangement is the rotating bearing ring, it cannot be ruled out during the operation of this roller bearing that the inner bearing ring moves relative to the outer, stationary bearing ring by the inner bearing ring approaching and opposite the outer bearing ring in the load zone of the roller bearing the load zone slightly away from the outer bearing ring. If the clip is between the two bearing rings, the preload of the clip between the two bearing rings and with it the friction between the bearing rings changes due to the operational relative movements of the inner bearing ring in relation to the outer bearing ring, as is easy to understand. This change in friction has the consequence that the use of energy to operate such rolling bearings is slightly increased.

In the light of the previously known prior art, it is therefore the object of the invention to provide a potential equalization arrangement with improved protection against harmful bearing currents with the lowest possible friction. In particular, it is also the object of the invention to provide a roller bearing arrangement that protects against harmful bearing currents, particularly in a roller bearing arrangement that runs wet.

This object is achieved by a potential equalization arrangement, in particular for use in an electric machine of a drive train of a hybrid or all-electric motor vehicle, with a current-conducting element which is arranged in or on an annular intermediate space through which a lubricant can flow, the intermediate space being surrounded by an outer cylinder component and an inner cylinder component accommodated in the outer cylinder component, and the current-conducting element electrically conductively connects the outer cylinder component to the inner cylinder component, wherein the current-conducting element comprises a spring-elastic and electrically conductive clamp element which is spring-elastic outwards in the radial direction and which is prestressed into the outer cylinder component is used, the clamp element has a first holding section and at least one second holding section, an electrically conductive thread extending through the gap between the first holding section and the at least second holding section in such a way that it rests in sections on a first electrically conductive contact area of the inner cylinder component.

The equipotential bonding arrangement can thus be designed to be particularly low-friction and operationally reliable. A high level of operational reliability of the potential equalization arrangement according to the invention has also been shown in a wet room. The current-conducting element of the potential equalization arrangement can also be produced inexpensively and easily.

A clip element can preferably be formed from sheet metal or wire. In this context, it is particularly preferred to form the clamp element from spring steel.

A thread is a pliable structure composed of fibers that has a dominant one-dimensional extension and a uniformity in the longitudinal direction. The fibers can be formed from a group of essentially the same fibers or from several groups of different fibers. The various fibers can differ from one another in particular with regard to their material. For example, it would be possible to use fibers with a suitable elasticity and fibers with a particularly high electrical conductivity together in one thread.

The thread can be made of any electrically conductive material. In order to improve the conductivity of the thread in the contact area, it is particularly preferred to provide a coating which has a higher electrical conductivity than the thread. For example, gold coatings, silver coatings or platinum coatings would be suitable for this.

A clip element can have a circumferentially open or closed contour. According to an advantageous embodiment of the invention, it can be provided that the clamp element has a C-shaped cross-sectional contour. The advantage of this configuration is that a clamp element with a radial spring effect can be provided in a manner that is simple in terms of production technology.

According to a further preferred further development of the invention, it can also be provided that the current-conducting element has a plurality of clamp elements. In this way, increased redundancy can be achieved against the failure of a clamp element. Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the plurality of clamp elements are essentially of the same part, which has a positive effect on the production costs.

According to a further particularly preferred embodiment of the invention, it can be provided that the plurality of clamp elements are fixed to one another in the circumferential direction by spacer elements. In this way, it is possible in particular to prevent the clamping elements from being circumferentially offset relative to one another, which could lead to a functional impairment of the current-conducting element.

Furthermore, the invention can also be further developed such that the thread bears tangentially on the first electrically conductive contact area or wraps around the first electrical contact area at least in sections.

You can choose between a particularly low frictional resistance and a particularly large contact line.

In a likewise preferred embodiment variant of the invention, provision can also be made for a plurality of electrically conductive contact areas to be distributed over the circumference of the inner cylinder component, each of which is contacted by a thread, as a result of which greater functional reliability can also be achieved against the failure of a contact area.

It can also be advantageous to further develop the invention in such a way that the inner cylinder component is an inner ring of a roller bearing and/or the outer cylinder component is an outer ring of a roller bearing. The advantage that can be realized in this way is that the current-conducting element can be integrated directly into a roller bearing.

According to a further preferred embodiment of the subject matter of the invention, however, it can also be provided that the potential equalization arrangement comprises a roller bearing in which the current-conducting element is arranged at a distance from the roller bearing, which, for example, enables the use of standard roller bearings.

The object of the invention can also be achieved by a roller bearing arrangement, in particular for use in an electric machine of a drive train of a hybrid or all-electric motor vehicle, comprising a Rolling bearing with an inner ring, an outer ring and rolling elements, wherein the inner ring has an inner ring raceway and the outer ring has an outer ring raceway, and the rolling elements are mounted in a rolling manner between the inner ring and the outer ring, with a current-conducting element being arranged between the inner ring and the outer ring, which connects the inner ring with connects the outer ring in an electrically conductive manner, the electrically conductive element comprising a spring-elastic and electrically conductive clamp element which is outwardly resilient in the radial direction and which is inserted into the outer ring under pretension, the clamp element having a first holding section and at least one second holding section, with between the first holding section and the at least second holding section, an electrically conductive thread extends between the inner ring and the outer ring in such a way that it rests in sections on a first electrically conductive contact region of the inner ring.

Rolling bearings can be used in particular to fix and/or mount axles and shafts, depending on the design, absorbing radial and/or axial forces and at the same time enabling the rotation of the shaft or the components mounted on an axle in this way.

For this purpose, rolling elements are arranged between an inner ring and an outer ring of the roller bearing. Between these three main components, inner ring, outer ring and the rolling elements, it is usually mainly rolling friction that occurs within the rolling bearing. Since the rolling elements in the inner and outer ring can preferably roll on hardened steel surfaces with optimized lubrication, the rolling friction of such bearings is relatively low.

The inner ring can in particular connect the shaft accommodating the roller bearing to the roller bearing or the roller bodies. In particular, the shaft can be connected to the side of the lateral surface of the inner ring that faces the shaft, with the rolling elements of the roller bearing rolling on the inner ring raceway that is opposite this lateral surface. The inner ring can be made of a metallic and/or ceramic material. In principle, it is conceivable to design the inner ring in one piece or in multiple pieces, in particular in two pieces.

The inner ring can have an inner ring groove. In particular, a cover disk, sealing disk and/or seal can be arranged in an inner ring groove, in particular in a non-positive and/or positive manner. The inner ring recess is preferably designed as a circumferential groove in the inner ring.

The outer ring can, in particular, connect the bearing arrangement accommodating the roller bearing to the roller bearing or the roller bodies. In particular, the bearing can be connected to the side of the lateral surface of the outer ring facing the bearing, with the rolling elements of the roller bearing rolling on the outer ring raceway opposite this lateral surface. The outer ring can be made of a metallic and/or ceramic material. In principle, it is conceivable to design the outer ring in one piece or in multiple pieces, in particular in two pieces.

The outer ring can have an outer ring groove. In particular, a cover disk, sealing disk and/or seal can be arranged in an outer ring groove, in particular in a non-positive and/or positive manner. The recess in the outer ring is preferably designed as a circumferential groove in the outer ring.

Depending on the type of rolling bearing, the rolling elements have the shape of a ball or a roller. They roll on the raceways of the roller bearing and have the task of transferring the force acting on a radial roller bearing from the outer ring to the inner ring and vice versa. In an axial roller bearing, the rolling elements transmit the forces acting on the axial roller bearing between the running disks. Roller-shaped rolling elements are also referred to as roller rolling elements and spherical rolling elements as bearing balls. Roller-shaped rolling bodies can be selected, for example, from the group of symmetrical spherical rollers, asymmetrical spherical rollers, cylindrical rollers, needle rollers and/or tapered rollers.

Rolling elements can be guided and spaced apart in a cage or by rolling element spacers. In principle, it is also conceivable to design a roller bearing without a cage, which is also referred to as a full complement roller bearing. In full complement rolling bearings, adjacent rolling elements can contact each other.

The rolling bodies can roll within the rolling bearing, in particular on the inner ring raceway of the inner ring. For this purpose, the surface of the inner ring raceway can advantageously be designed to be correspondingly abrasion-resistant, for example also by means of a corresponding surface treatment process and/or by applying a corresponding additional layer of material. The inner ring raceway can be flat or profiled. A profiled design of the inner ring raceway can be used, for example, to guide the rolling elements on the inner ring raceway. A flat shape of the inner ring raceway, however, can, for example, a certain axial Allow the rolling elements to be displaced on the inner ring raceway.

The rolling bodies can roll within the rolling bearing, in particular on the outer ring raceway of the outer ring. For this purpose, the surface of the outer ring raceway can advantageously be designed to be abrasion-resistant, for example by means of a corresponding surface treatment process and/or by applying a corresponding additional layer of material.

The outer ring raceway can be flat or profiled. A profiled design of the outer ring raceway can be used, for example, to guide the rolling elements on the outer ring raceway. On the other hand, a planar shape of the outer ring raceway can, for example, allow a certain axial displaceability of the rolling elements on the outer ring raceway.

A roller bearing can have a cage, with the cage guiding the rolling elements. The cage is designed in such a way that the rolling element balls and/or the rolling element rollers are spaced apart from one another so that, for example, the friction and heat development of the rolling elements is kept as low as possible. Furthermore, the cage keeps the rolling element balls and/or rolling element rollers at a fixed distance from one another during rolling, as a result of which an even load distribution can be achieved. The cage can be made in one piece or in several pieces.

A roller bearing may have a seal to prevent lubricant from escaping from the roller bearing or dirt or moisture from entering the roller bearing. For this purpose, the seals used can be provided with one or more sealing lips, which can rest against a component of the roller bearing. These are designed in such a way that on the one hand they seal the bearing for as long as possible over the entire service life, and on the other hand the friction caused by the adjacent seal is not too high.

A potential equalization arrangement according to the invention and/or a roller bearing arrangement according to the invention can be used in particular in an electrically or hybrid drive train of a motor vehicle.

The potential equalization arrangement according to the invention and/or a roller bearing arrangement according to the invention is particularly preferably used in an electrical machine.

Electrical machines are used to convert electrical energy into mechanical energy and/or vice versa, and generally include a stationary part referred to as a stator, stand or armature and a part referred to as a rotor or runner and arranged movably relative to the stationary part. The rotor may include a rotor body and a rotor shaft. In the context of the invention, a rotor body is understood to mean the rotor without a rotor shaft. It is highly preferred to mount the rotor by means of a roller bearing arrangement and/or an equipotential bonding arrangement according to the invention.

The electrical machine can also have a hydraulic cooling circuit. The hydraulic cooling circuit is particularly preferably operated with a free-flowing oil. The hydraulic cooling circuit, which is in particular closed, is very particularly preferably designed in such a way that the free-flowing oil is used to lubricate a roller bearing arrangement according to the invention for supporting the rotor of the electrical machine. For this purpose, the oil of the hydraulic cooling circuit is preferably passed through the roller bearing.

For the purposes of this application, the drive train of a motor vehicle is understood to mean all components that generate the power for driving the motor vehicle in the motor vehicle and transmit it to the road via the vehicle wheels.

In particular, an electric machine can be part of a hybrid module. In a hybrid module, structural and functional elements of a hybridized drive train can be spatially and/or structurally combined and preconfigured, so that a hybrid module can be integrated in a particularly simple manner into a drive train of a motor vehicle. In particular, an electric motor and a clutch system, in particular with a separating clutch for coupling the electric motor into and/or decoupling the electric motor from the drive train, can be present in a hybrid module.

For the purposes of this application, motor vehicles are land vehicles that are moved by machine power without being tied to railroad tracks. A motor vehicle can be selected, for example, from the group of passenger cars (cars), trucks (lorries), mopeds, light motor vehicles, motorcycles, buses (COM) or tractors.

A fully electric axle drive train of a motor vehicle preferably includes an electric machine and a transmission, the electric machine and the transmission forming a structural unit. Provision can in particular be made for the electric machine and the transmission to be arranged in a common drive train housing. Alternatively, it would of course also be possible that the electrical machine has a motor housing and the transmission has a transmission housing, the structural unit then being able to be effected by fixing the transmission relative to the electrical machine. This structural unit is sometimes also referred to as the E-axis.

The invention will be explained in more detail below with reference to figures without restricting the general inventive idea.

• 1 eine erste Ausführungsform einer Potentialausgleichsanordnung in einer schematischen Axialschnittansicht,
• 2 eine erste Ausführungsform einer Potentialausgleichsanordnung in einer schematischen Axialschnittansicht,
• 3 eine dritte Ausführungsform einer Potentialausgleichsanordnung in einer schematischen Axialschnittansicht,
• 4 eine erste Ausführungsform eines stromleitenden Elements in einer schematischen Querschnittsansicht,
• 5 eine erste Ausführungsform eines stromleitenden Elements in einer schematischen Axialschnittansicht,
• 6 eine zweite Ausführungsform eines stromleitenden Elements in einer schematischen Querschnittsansicht,
• 7 eine dritte Ausführungsform eines stromleitenden Elements in einer schematischen Querschnittsansicht,
• 8 eine vierte Ausführungsform eines stromleitenden Elements in einer schematischen Querschnittsansicht,
• 9 ein hybrid und ein vollelektrisch betriebenes Kraftfahrzeug in einer schematischen Blockschaltdarstellung.

It shows:

• 1 a first embodiment of a potential equalization arrangement in a schematic axial sectional view,
• 2 a first embodiment of a potential equalization arrangement in a schematic axial sectional view,
• 3 a third embodiment of a potential equalization arrangement in a schematic axial sectional view,
• 4 a first embodiment of a current-conducting element in a schematic cross-sectional view,
• 5 a first embodiment of a current-conducting element in a schematic axial sectional view,
• 6 a second embodiment of a current-conducting element in a schematic cross-sectional view,
• 7 a third embodiment of a current-conducting element in a schematic cross-sectional view,
• 8th a fourth embodiment of a current-conducting element in a schematic cross-sectional view,
• 9 a hybrid and an all-electric motor vehicle in a schematic block diagram.

The 1 shows a potential equalization arrangement 20 for use in an electric machine 21 of a drive train 22 of a hybrid or all-electric motor vehicle 23, as exemplified in FIG 10 is shown. The equipotential bonding arrangement 20 comprises a current-conducting element 8 which is arranged in or on an annular intermediate space 31 through which a lubricant 30 can flow. The lubricant 30 can, for example, be hydraulic oil or also cooling water.

The space 31 is defined by an outer cylinder member 4 and an inner cylinder member 3 accommodated in the outer cylinder member 4 . For this purpose, the outer cylinder component 4 has an essentially cylindrical inner lateral surface, while the inner cylinder component 3 has an essentially cylindrical outer lateral surface. These lateral surfaces are arranged coaxially to the axis of rotation 17 of the inner cylinder component 3, which is, for example, a rotor 24 of an electrical machine 21. The axis of rotation 17 of the rotor 24 is indicated in the figure by the dash-dot line. The outer lateral surface of the fixed outer component 4 can have any shape. In particular, the outer cylinder component 4 can be a housing component, for example an electrical machine 21 .

The current-conducting element 8 connects the outer, stationary cylinder component 4 to the inner, rotating cylinder component 3 in a current-conducting manner. How from the 4-8 As can be seen, the current-conducting element 8 is designed as a spring-elastic and electrically conductive clamp element 9 which is outwardly resilient in the radial direction and which is inserted under prestress into the outer cylinder component 4 and fixed there in a rotationally fixed manner due to the spring force acting in the radial direction.

The clamp element 9 has a first holding section 10 and at least one second holding section 13 . An electrically conductive thread 11 extends between the first holding section 10 and the second holding section 13 through the intermediate space 31 in such a way that it rests in sections on a first electrically conductive contact area 12 of the inner cylinder component 3 .

In the 4-8 various embodiments of the current-conducting element 8 are shown, which are explained in more detail below.

The 4-6 12 show embodiments of the current-conducting element in which the clip element 9 has a C-shaped cross-sectional contour. The free ends of a C-shaped clip element 9 are also formed as C-shaped sections, which extend radially inwards in the direction of the inner cylinder component 3 . The first and second holding sections 10, 13 are formed on these C-shaped sections. The clamp element 9 does not touch the inner cylinder component 3 in this case. A thread 11 is fixed and clamped in the holding sections 10,13. A certain spring action for tensioning the thread 11 between the holding sections 10,13 can be provided by the C-shaped sections at the free ends of the clip element 9.

The thread 11 is in tangential contact with the electrically conductive contact area 12 of the inner cylinder component 3 . How from the 5 shows, the electrically conductive contact area 12 can also have a have a groove-like contour into which the thread 11 engages and is guided.

The 6 shows an embodiment of the current-conducting element 8 with a C-shaped clamp element 9, in which the thread 11 is not as in the embodiment of FIG 4 tangentially to the inner cylinder component 3, but wraps around the inner cylinder component 4 in sections. In the embodiment shown 6 the wrap is around 190°.

The 7 shows another possible embodiment of the current-conducting element 8, in which the current-conducting element 8 has a plurality of C-shaped clamp elements 9. The arc of the two C-shaped bracket elements 9, as in the 7 are shown sweeps less than 180°.

In the embodiment shown, the clamp elements 9 are essentially of equal parts and are fixed to one another in the circumferential direction by spacer elements 14 . The threads 11 lie tangentially on the electrically conductive contact areas 12 . A plurality of electrically conductive contact regions 12 are thus distributed over the circumference of the inner cylinder component 3 and a thread 11 rests against each of them.

8th shows a further embodiment of a current-conducting element 8, in which the clamp element 9 has a circumferentially closed contour. The contour of the clamp element 9 has a sinusoidal shape along a circular path, the radially outer arcuate sections being pretensioned and resting against the outer cylinder component 4 in a torque-proof manner. Two threads 11 are stretched on the radially inner arcuate sections, which are shown as being distinguishable from one another by a solid and dotted line. The radially inner curved sections of the clamp element 9 form the holding sections 10, 13 for the threads 11.

The 2 shows an embodiment of a potential equalization arrangement 20, which is based on the embodiment of FIG 1 now also includes a roller bearing 2 , with the current-conducting element 8 being arranged at an axial distance from the roller bearing 2 in the annular intermediate space 31 .

In the 3 an embodiment of a potential equalization arrangement 20 is shown, in which the inner cylinder component 3 is an inner ring of a roller bearing 2 and the outer cylinder component 4 is an outer ring of a roller bearing 2 . 3 thus shows a roller bearing arrangement 1, in particular for use in an electric machine 21 of a drive train 22 of a hybrid or all-electric motor vehicle 23, comprising a roller bearing 2 with an inner ring 3, an outer ring 4 and rolling elements 5, the inner ring 3 having an inner ring raceway 6 and the Outer ring 4 has an outer ring raceway 7, and the rolling elements 5 are mounted in rolling fashion between inner ring 3 and outer ring 4. A current-conducting element 8 is arranged between the inner ring 3 and the outer ring 4, as can be seen in particular from FIGS 4-8 is known. The current-conducting element 8 connects the inner ring 3 to the outer ring 4 in a current-conducting manner. The inner ring 3 is rotationally fixed to the rotor 24 of an electrical machine 21 and the outer ring 4 is rotationally fixed to a housing 25.

The invention is not limited to the embodiments shown in the figures. The foregoing description is therefore not to be considered as limiting but as illustrative. The following patent claims are to be understood in such a way that a mentioned feature is present in at least one embodiment of the invention. This does not exclude the presence of other features. If the patent claims and the above description define 'first' and 'second' feature, this designation serves to distinguish between two similar features without establishing a ranking.

Reference List

1

roller bearing arrangement

2

roller bearing

3

inner cylinder component / inner ring

4

outer cylinder component / outer ring

5

rolling elements

6

inner ring raceway

7

outer ring raceway

8th

conductive element

9

clip element

10

holding section

11

thread

12

contact area

13

holding section

14

spacers

17

axis of rotation

20

equipotential bonding arrangement

21

electric machine

22

powertrain

23

motor vehicle

24

rotor

25

Housing

30

lubricant

31

space

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• KR 20180103802 [0006]

Claims (10)

Equipotential bonding arrangement (20), in particular for use in an electric machine (21) of a drive train (22) of a hybrid or all-electric motor vehicle (23), with a current-conducting element (8) which is in or on a through which a lubricant (30) can flow annular space (31), the space (31) being defined by an outer cylinder member (4) and an inner cylinder member (3) received in the outer cylinder member (4), and the current-conducting element (8) comprises the outer cylinder member ( 4) with the inner cylinder component (3) in a current-conducting manner, characterized in that the current-conducting element (8) comprises a spring-elastic and electrically conductive clamp element (9) which is spring-elastic outwards in the radial direction and which is inserted under pretension into the outer cylinder component (4). , wherein the clip element (9) has a first holding section (10) and at least one second holding section (13). st, an electrically conductive thread (11) extending through the gap (31) between the first holding section (10) and the at least second holding section (13) in such a way that it is partially attached to a first electrically conductive contact area (12) of the inner cylinder component (3) applied. Equipotential bonding arrangement (20) after claim 1 , characterized in that the clamp element (9) has a C-shaped cross-sectional contour. Potential equalization arrangement (20) according to one of the preceding claims, characterized in that the current-conducting element (8) has a plurality of clamp elements (9). Equipotential bonding arrangement (20) after claim 3 , characterized in that the plurality of clamp elements (9) is substantially equal. Equipotential bonding arrangement (20) after claim 3 or 4 , characterized in that the plurality of clamp elements (9) is fixed to one another in the circumferential direction by spacer elements (14). Equipotential bonding arrangement (20) according to one of the preceding claims, characterized in that the thread (11) bears tangentially on the first electrically conductive contact area (12) or wraps around the first electrical contact area (12) at least in sections. Equipotential bonding arrangement (20) according to one of the preceding claims, characterized in that distributed over the circumference of the inner cylinder component (3) are a plurality of electrically conductive contact areas (12) on which a thread (11) rests in each case. Equipotential bonding arrangement (20) according to one of the preceding claims, characterized in that the inner cylinder component (3) is an inner ring of a roller bearing (2) and/or the outer cylinder component (4) is an outer ring of a roller bearing (2). Potential equalization arrangement (20) according to one of the preceding claims, characterized in that the potential equalization arrangement (20) comprises a roller bearing (2), the current-conducting element (8) being arranged at a distance from the roller bearing (2). Rolling bearing arrangement (1), in particular for use in an electric machine of a drive train of a hybrid or all-electric motor vehicle, comprising a rolling bearing (2) with an inner ring (3), an outer ring (4) and rolling bodies (5), the inner ring (3 ) has an inner ring raceway (6) and the outer ring (4) has an outer ring raceway (7), and the rolling elements (5) are mounted in a rolling manner between the inner ring (3) and the outer ring (4), with the inner ring (3) and the outer ring ( 4) a current-conducting element (8) is arranged, which connects the inner ring (3) to the outer ring (4) in a current-conducting manner, characterized in that the current-conducting element (8) is a spring-elastic and electrically conductive clamp element (9) which is spring-elastic towards the outside in the radial direction comprises, which is used under prestress in the outer ring (4), wherein the clamp element (9) has a first holding portion (10) and at least one second holding portion (13), wherein between Between the first holding section (10) and the at least second holding section (13), an electrically conductive thread (11) extends between the inner ring (3) and the outer ring (4) in such a way that it is partially attached to a first electrically conductive contact area (12). of the inner ring (3).

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