DE102022116038A1 - Rolling bearing arrangement and electrical machine - Google Patents

Abstract

The invention relates to a rolling bearing arrangement (1), in particular for an electric machine (20) within a drive train (40) of a motor vehicle (50), comprising a rolling bearing (4) arranged between a connecting structure (2) and a shaft (3). for rotatably supporting the shaft (3) relative to the connecting structure (2), the rolling bearing (4) having an inner ring (5) and an outer ring (6) connected in a rotationally fixed manner to the shaft (3) and between the inner ring (5) and the outer ring (6) has rolling elements (7) arranged in a rolling manner, the rolling bearing arrangement (1) comprising a sensor unit (8) with an active sensor (9) and a sensor target (10) which can be rotated relative to the sensor (9), the sensor (9) fixed to the outer ring (6) and the sensor target (10) is operatively connected to the shaft (3) in a rotationally fixed manner, the inner ring (5) being electrically insulated on its inner surface (13) via a first insulation layer (11) on the shaft (3). is fixed and / or the outer ring (6) is fixed to the connection structure (2) in a current-insulating manner on its outer lateral surface (14) via a second insulation layer (12).

Description

The present invention relates to a rolling bearing arrangement, in particular for an electric machine within a drive train of a motor vehicle, comprising a rolling bearing arranged between a connecting structure and a shaft for rotatably supporting the shaft relative to the connecting structure, the rolling bearing having an inner ring and an outer ring connected in a rotationally fixed manner to the shaft as well as rolling elements arranged in a rolling manner between the inner ring and the outer ring. The invention further relates to an electrical machine.

Electric motors are increasingly being used to drive motor vehicles in order to create alternatives to combustion engines that require fossil fuels. Significant efforts have already been made to improve the suitability of electric drives for everyday use and to offer users the usual driving comfort.

When using rolling bearings, for example in or on electrical machines within a fully electric drive train or within a hybridized drive train of a motor vehicle, current can pass through. The switching pulses from converters, for example, lead to the build-up of tension between the bearing rings of rolling bearings. This tension is continually reduced by breakdowns. Under unfavorable conditions, current damage to raceways and rolling elements occurs. 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, the downtime of the machine results in additional costs.

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

In the case of electric motors, it is also very important how the parts through which the magnetic field flows are positioned relative to one another. This affects both the mechanical structure of the electric motor, through which the parts are held and positioned precisely, as well as precise knowledge of the angular position of the rotating parts. A precise, rigid mechanical structure is important because even small positional deviations between the parts can significantly influence the magnetic flux (for example due to changed air gaps). But precise knowledge of the current position of the rotor is also crucial, because the constantly changing bearing of the magnets integrated in the rotating rotor (angular position) must always be known exactly relative to the magnet integrated in the stator in order to control the electric motor to be able to navigate correctly. The changing angular position of the rotor must be known exactly at any time in order to align the rotor components (e.g. the rotor magnets, which are usually designed as permanent magnets) relative to the stator components (e.g. the stator magnets, which are usually designed as electromagnets to be carried out) and to be able to adapt the control of the motor accordingly.

It is therefore important to integrate a rotor position sensor into the mechanical structure of the electric motor in such a way that the sensor can detect the relative position of the magnetically relevant parts exactly, i.e. with the lowest possible tolerance influence. At the same time, the size and installation conditions of the sensor must not negatively influence the mechanical structure of the electric motor, so that a sufficiently robust and dimensionally accurate design of all parts and assemblies is possible, as is their exact alignment during assembly. Particularly in electric motors for vehicle applications, the rotor position sensor must be integrated into the structure of the motor as compactly and cost-effectively as possible.

It is therefore the object of the invention to provide a rolling bearing arrangement which meets these requirements and at least mitigates or completely avoids the problems known from the prior art. It is also the object of the invention to realize an improved electrical machine.

This object is achieved by a rolling bearing arrangement, in particular for an electric machine within a drive train of a motor vehicle, comprising a rolling bearing arranged between a connecting structure and a shaft for rotatably supporting the shaft relative to the connecting structure, wherein the rolling bearing has an inner ring connected to the shaft in a rotationally fixed manner and a Outer ring and rolling bodies arranged in a rolling manner between the inner ring and the outer ring, the rolling bearing arrangement comprising a sensor unit with an active sensor and a sensor target that can be rotated relative to the sensor, the sensor being fixed to the outer ring and the sensor target being operatively connected to the shaft in a rotationally fixed manner, the Inner ring is fixed to the shaft in a current-insulating manner on its inner lateral surface via a first insulation layer and/or the outer ring is fixed to its outer lateral surface a second insulation layer is fixed to the connection structure in a current-insulating manner.

This achieves the advantage that a structural unit consisting of a sensor unit and an insulation bearing can be provided to protect against unwanted current passages, which, in addition to a compact structure, can also be produced inexpensively and is easy to assemble.

In the context of the invention, current-insulating means that the current flow between the connection structure and/or shaft towards the rolling bearing is at least reduced, preferably substantially completely prevented.

First, the individual elements of the claimed subject matter of the invention are explained in the order in which they are mentioned in the claim sentence and particularly preferred embodiments of the subject matter of the invention are described below.

Rolling bearings can be used in particular to enable rotational movements with the lowest possible friction losses. Rolling bearings can be used in particular to fix and/or support axles and shafts, where, depending on the design, they absorb radial and/or axial forces and at the same time enable the rotation of the shaft or the components mounted on an axle.

For this purpose, rolling rolling bodies are arranged between an inner ring and an outer ring of the rolling bearing. As a rule, mainly rolling friction occurs within the rolling bearing between these three main components, the inner ring, the outer ring and the rolling elements. Since the rolling elements in the inner and outer rings 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 receiving the rolling bearing with the rolling bearing or the rolling elements. In particular, the shaft can be connected to the side of the lateral surface of the inner ring facing the shaft, with the rolling bodies of the rolling bearing rolling on the inner ring raceway opposite this lateral surface. The inner ring can be formed from a metallic and/or ceramic material. In principle, it is conceivable to design the inner ring in one piece or in several parts, in particular in two parts.

The inner ring can have an inner ring recess. In particular, a cover disk, sealing disk and/or seal can be arranged in an inner ring recess, 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 receiving bearing with the rolling bearing or the rolling elements. In particular, the bearing can be connected to the side of the lateral surface of the outer ring facing the bearing, with the outer ring raceway opposite this lateral surface rolling the rolling elements of the rolling bearing. The outer ring can be formed from a metallic and/or ceramic material. In principle, it is conceivable to design the outer ring in one piece or in several parts, in particular in two parts.

The outer ring can have an outer ring recess. In particular, a cover disk, sealing disk and/or seal can be arranged in an outer ring recess, in particular in a non-positive and/or positive manner. The outer ring recess 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 rolling bearing and have the task of transferring the force acting on a radial rolling bearing from the outer ring to the inner ring and vice versa. In an axial rolling bearing, the rolling elements transmit the forces acting on the axial rolling bearing between the running disks. Roller-shaped rolling elements are also called roller rolling elements and spherical rolling elements are called bearing balls.

Roller-shaped rolling bodies can, for example, be selected from the group of symmetrical pendulum rollers, asymmetrical pendulum rollers, cylindrical rollers, needle rollers and/or tapered rollers.

Rolling elements can be guided in a cage or through rolling element spacers and spaced apart from one another. In principle, it is also conceivable to design a cageless rolling bearing, which is also referred to as a full complement rolling bearing. With full complement rolling bearings, adjacent rolling elements can contact each other.

The rolling elements 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 by means of a corresponding surface treatment process and/or by applying a corresponding additional material layer. 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, on the other hand, can, for example, allow a certain axial displaceability of the rolling elements on the inner ring raceway.

The rolling elements 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 correspondingly abrasion-resistant, for example by means of a corresponding surface treatment process and/or by applying a corresponding additional material layer.

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. A flat shape of the outer ring raceway, on the other hand, can, for example, allow a certain axial displaceability of the rolling elements on the outer ring raceway.

A rolling bearing can have a cage, with the cage guiding the rolling elements. The cage is designed in such a way that the rolling body balls and/or the rolling body rollers are spaced apart from one another, so that, for example, the friction and heat development of the rolling bodies 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, whereby an even load distribution can be achieved. The cage can be made in one piece or in several pieces.

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

The rolling bearing arrangement according to the invention is particularly suitable and intended for use within a drive train of an electric or hybrid motor vehicle. The rolling bearing arrangement according to the invention can most preferably be used to support a rotor shaft of an electric machine and/or to support a transmission shaft of a transmission arrangement, with use within a motor vehicle being particularly advantageous.

For the purposes of this application, motor vehicles are land vehicles that are moved by mechanical power without being tied to railway tracks. A motor vehicle can, for example, be selected from the group of passenger cars (passenger cars), trucks (lorries), mopeds, light vehicles, motorcycles, motor buses (KOM) or tractors. A hybrid electric vehicle, also known as a hybrid electric vehicle (HEV), is an electric vehicle that is powered by at least one electric motor and another energy converter and draws energy from both its electrical storage (battery) and additional fuel.

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

An electrical machine is used to convert electrical energy into mechanical energy and/or vice versa. In connection with the invention, the electrical machine of an axle drive train can be designed as a radial or axial flux machine. In order to create an axially particularly compact axle drive train, axial flux machines are to be preferred. An electrical machine usually includes a stationary part called a stator, stand or armature and a part called a rotor or rotor which is arranged to be movable relative to the stationary part. An electrical machine can be designed to run dry or wet. The electric machine is intended in particular for use within an electrically operable drive train of a motor vehicle. In particular, the electric machine is dimensioned such that vehicle speeds greater than 50 km/h, preferably greater than 80 km/h and in particular greater than 100 km/h can be achieved. The electric motor particularly preferably has a power greater than 30 kW, preferably greater than 50 kW and in particular greater than 70 kW. It is further preferred that the electric machine provides speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, most preferably greater than 12,500 rpm.

The rolling bearing arrangement according to the invention can also be used in a highly preferred manner for supporting a rotor shaft of an electric machine and/or for supporting a transmission shaft of a transmission arrangement within an electric axle drive train. An electric axle drive train of a motor vehicle includes an electric machine and an Gear arrangement, wherein the electric machine and the gear arrangement form a structural unit. This structural unit is sometimes also referred to as an e-axle.

The transmission arrangement of the electric axle drive train can in particular be coupled to the electric machine, which is designed to generate a drive torque for the motor vehicle. The drive torque is particularly preferably a main drive torque, so that the motor vehicle is driven exclusively by the drive torque. The gear arrangement can further preferably be configured as a planetary gear or include a planetary gear. The planetary gear can preferably have a sun gear and a plurality of planet gears which are in engagement with the sun gear and are rotatably mounted in a planet gear carrier and which move rotationally around the sun gear, as well as a ring gear arranged coaxially to the sun gear, in which the planet gears roll.

The sensor arrangement is preferably designed as an absolute or relative rotor position sensor for an electrical machine. The sensor arrangement preferably provides a sensor signal representing the rotor position. Most preferably, the sensor signal is sent to a control device for controlling the electrical machine.

An electrical machine can also have a control device. A control device, as can be used in the present invention, is used in particular for the electronic control and/or regulation of one or more technical systems of the electrical machine.

A control device has in particular a wired or wireless signal input for receiving, in particular, electrical signals, such as sensor signals. Furthermore, a control device also preferably has a wired or wireless signal output for transmitting, in particular, electrical signals.

Control operations and/or regulation operations can be carried out within the control device. It is particularly preferred that the control device comprises hardware that is designed to execute software. The control device preferably comprises at least one electronic processor for executing program sequences defined in software.

The control device can also have one or more electronic memories in which the data contained in the signals transmitted to the control device can be stored and read out again. Furthermore, the control device can have one or more electronic memories in which data can be stored in a changeable and/or unchangeable manner.

A control device can comprise a plurality of control devices, which are arranged in particular spatially separated from one another in the motor vehicle. Control devices are also referred to as Electronic Control Unit (ECU) or Electronic Control Module (ECM) and preferably have electronic microcontrollers for carrying out arithmetic operations to process data, particularly preferably using software. The control devices can preferably be networked with one another, so that wired and/or wireless data exchange between control devices is possible. In particular, it is also possible to network the control devices with one another via bus systems present in the motor vehicle, such as CAN bus or LIN bus.

Very particularly preferably, the control device has at least one processor and at least one memory, which in particular contains a computer program code, the memory and the computer program code being configured with the processor to cause the control device to execute the computer program code.

The control unit can particularly preferably include power electronics for energizing the stator or rotor. Power electronics is preferably a combination of various components that control or regulate a current to the electrical machine, preferably including the peripheral components required for this, such as cooling elements or power supplies. In particular, the power electronics or one or more power electronics components contain which are set up to control or regulate a current. This is particularly preferably one or more power switches, for example power transistors. Particularly preferably, the power electronics has more than two, particularly preferably three, phases or current paths that are separate from one another, each with at least one separate power electronics component. The power electronics are preferably designed to control or regulate a power per phase with a peak power, preferably continuous power, of at least 10 W, preferably at least 100 W, particularly preferably at least 1000 W.

The electric machine is particularly intended for use within a drive train of a hybrid or fully electric motor vehicle. In particular, the electric machine is dimensioned such that vehicle speeds greater than 50 km/h, preferably greater than 80 km/h and in particular greater than 100 km/h can be achieved. The electric machine particularly preferably has a power greater than 30 kW, preferably greater than 50 kW and in particular greater than 70 kW. It is further preferred that the electric machine provides speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, most preferably greater than 12,500 rpm.

According to an advantageous embodiment of the invention, it can be provided that the first insulation layer and/or the second insulation layer are/is formed from a current-insulating plastic. According to a further preferred development of the invention, it can also be provided that the first insulation layer and/or the second insulation layer are applied by means of a plastic injection molding process. In this way, an insulation layer that is favorable in terms of production technology can be realized.

Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the outer ring has a radially inward-pointing shoulder on its outer lateral surface, to which the sensor is fixed via a fastening means. The advantageous effect of this configuration is that the outer ring can thereby provide a radial as well as axial stop, whereby a defined positioning of the sensor relative to the rolling bearing can be achieved.

According to a further particularly preferred embodiment of the invention, it can be provided that the fastening means is fixed to the shoulder with the second insulation layer interposed. The shoulder can be formed in the outer ring before the insulation layer is applied, which can be particularly advantageous in terms of process technology.

Furthermore, the invention can also be further developed in such a way that the inner ring has a radially outward-pointing shoulder on its inner surface, to which the sensor target is fixed, so that it can be connected to the inner ring in a modular manner, in particular before the rolling bearing is installed .

In a likewise preferred embodiment variant of the invention, it can also be provided that the sensor target is fixed to the shoulder with the first insulation layer interposed, whereby a current-insulating effect can be provided or an existing one can be improved.

It can also be advantageous to further develop the invention in such a way that the inner surface of the inner ring is essentially cylindrical and the insulation layer has a shoulder pointing radially outwards to which the sensor target is fixed. The advantage of this configuration is that an inner ring can be used without any further design changes, since the function of sensor target fixation via a shoulder is implemented solely by the insulation layer.

According to a further preferred embodiment of the subject matter of the invention, it can be provided that the sensor target rests axially on the inner ring on the one hand and on an axially secured securing sleeve on the other hand.

This makes it possible to achieve a particularly easy-to-assemble and defined axial fixation of the sensor target.

The object of the invention can also be achieved by an electrical machine, in particular within a drive train of a motor vehicle, wherein the electrical machine has a stator and a rotor which is rotatably mounted relative to the stator and the rotor is arranged in a rotationally fixed manner on a rotor shaft, the rotor shaft being in at least a rolling bearing arrangement according to one of claims 1-9 is stored.

The invention will be explained in more detail below using figures without restricting the general idea of the invention.

• 1 eine erste Ausführungsform einer Wälzlageranordnung in einer schematischen Axialschnittdarstellung,
• 2 eine zweite Ausführungsform einer Wälzlageranordnung in einer schematischen Axialschnittdarstellung,
• 3 eine dritte Ausführungsform einer Wälzlageranordnung in einer schematischen Axialschnittdarstellung,
• 4 eine elektrische Maschine mit einer Wälzlageranordnung in einer schematischen Axialschnittdarstellung,
• 5 ein Kraftfahrzeug mit einer elektrischen Maschine in einer schematischen Blockschaltdarstellung.

It shows:

• 1 a first embodiment of a rolling bearing arrangement in a schematic axial sectional representation,
• 2 a second embodiment of a rolling bearing arrangement in a schematic axial sectional representation,
• 3 a third embodiment of a rolling bearing arrangement in a schematic axial sectional representation,
• 4 an electrical machine with a rolling bearing arrangement in a schematic axial sectional representation,
• 5 a motor vehicle with an electric machine in a schematic block diagram.

The 1-3 each show a rolling bearing arrangement 1 for an electrical machine 20 within a drive train 40 of a motor vehicle 50, as exemplified in the 5 is sketched.

What these rolling bearing arrangements 1 have in common is that they include a rolling bearing 4 arranged between a connecting structure 2 and a shaft 3 for rotatably supporting the shaft 3 relative to the connecting structure 2, the rolling bearing 4 having an inner ring 5 and an outer ring 6 connected in a rotationally fixed manner to the shaft 3 has rolling elements 7 arranged in a rolling manner between the inner ring 5 and the outer ring 6.

The rolling bearing arrangement 1 also has a sensor unit 8 with an active sensor 9 and a sensor target 10 that can be rotated relative to the sensor 9, the sensor 9 being fixed to the outer ring 6 and the sensor target 10 being operatively connected to the shaft 3 in a rotationally fixed manner. In the 1 the outer ring 6 is fixed on its outer lateral surface 14 via a second insulation layer 12 to the connection structure 2 in a current-insulating manner, while in the embodiments of 2-3 In each case, the inner ring 5 is fixed to the shaft 3 in a current-insulating manner on its inner lateral surface 13 via a first insulation layer 11.

The sensor target 10 is in the embodiments of 1-3 on the one hand axially on the inner ring 5 and on the other hand on an axially secured securing sleeve 18. This is axially fixed via an unspecified locking ring arranged in the shaft 3. The securing sleeve 18 extends axially through the sensor 9, so that the sensor target 10 can be easily mounted or secured from the axial direction.

The first insulation layer 11 and the second insulation layer 12 are formed from a current-insulating plastic and applied to the respective inner ring 5 or outer ring 6 by means of a plastic injection molding process.

In the in the 1 In the embodiment of the rolling bearing arrangement 1 shown, the outer ring 6 has a radially inwardly pointing shoulder 15 on its outer lateral surface 14, to which the sensor 9 is fixed via a fastening means 16. The fastening means 16 is fixed to the shoulder 15 by means of a press fit with the second insulation layer 12 interposed.

The insulation layer 12 on the outer surface 14 can be ground after the injection molding process. If necessary, the shoulder 15, onto which the sensor 9 is mounted or pressed, is also ground using the plunge grinding process. Ideally, however, the diameter tolerance width of the plastic-overmolded shoulder 15 is sufficiently precise so that grinding at this point of the insulation layer 12 is not necessary in order to press on the sensor 9.

Like from the 1 clearly visible, the inner ring 5 has a radially outwardly pointing shoulder 17 on its inner lateral surface 13, to which the sensor target 10 is fixed. In this case, the sensor target 10 can then also be fixed to the shoulder 17 with the first insulation layer 11 interposed, although this is not shown in the figures.

In contrast to that in the 1 shown embodiment of the invention, is in the embodiments of 2-3 the inner lateral surface 13 of the inner ring 5 is essentially cylindrical, i.e. without the in the 1 paragraph 17 shown.

In the 2 The sensor target 9, which is L-shaped in cross section, is fixed to the inner lateral surface 13 of the inner ring 5 by means of a press fit. The radial thickness of the insulation layer 11 is chosen so that the L-shaped sensor target 9 does not contact the shaft 3, but rather an annular gap 24 is formed between the sensor target 9 and the shaft 3, which is also clear from the enlarged detailed view in the 2 can be recognized.

3 shows a modification of the one from the 2 known embodiment of the rolling bearing arrangement 1, in which the insulation layer 11 has a radially outward-pointing shoulder 19 to which the sensor target 10 is fixed. A stepped encapsulation with a shoulder 19 in the insulation layer 11 is therefore formed on the inner ring 5. The sensor target 10 is pressed onto the shoulder 19.

The 4 shows an electrical machine 20, in particular within a drive train 40 of a motor vehicle 50, wherein the electrical machine 20 has a stator 21 and a rotor 22 which is rotatably mounted relative to the stator 20 and the rotor 22 is arranged in a rotationally fixed manner on a rotor shaft 23. The rotor shaft 23 is mounted in a rolling bearing arrangement 1, as shown in the 1-3 is known. Such an electric machine 20 can preferably be used in a drive train 40 of a motor vehicle 50, as is also the case in the 5 is reproduced. In the embodiment shown, the electric machine 20 is coupled to a gear arrangement 30 and forms a structural unit with it, which is sometimes also referred to as an E-axis.

The invention is not limited to the embodiments shown in the figures. The foregoing description is therefore not to be viewed as limiting but rather as illustrative. The following patent claims are to be understood as meaning that a stated 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' features, this designation serves to distinguish two similar features without establishing a ranking.

Reference symbol list

1

Rolling bearing arrangement

2

Connection structure

3

Wave

4

roller bearing

5

Inner ring

6

Outer ring

7

rolling elements

8th

Sensor unit

9

sensor

10

Sensor target

11

insulation layer

12

insulation layer

13

Lateral surface

14

Lateral surface

15

Paragraph

16

Fasteners

17

Paragraph

18

locking sleeve

19

Paragraph

20

electric machine

21

stator

22

rotor

23

Rotor shaft

24

Annular gap

30

Gear arrangement

40

Drivetrain

50

motor vehicle

Claims (10)

Rolling bearing arrangement (1), in particular for an electric machine (20) within a drive train (40) of a motor vehicle (50), comprising a rolling bearing (4) arranged between a connecting structure (2) and a shaft (3) for rotatably supporting the shaft ( 3) opposite the connection structure (2), the rolling bearing (4) having an inner ring (5) and an outer ring (6) connected in a rotationally fixed manner to the shaft (3), as well as rolling bodies arranged in a rolling manner between the inner ring (5) and the outer ring (6). (7), characterized in that the rolling bearing arrangement (1) comprises a sensor unit (8) with an active sensor (9) and a sensor target (10) rotatable relative to the sensor (9), the sensor (9) being on the outer ring (6) is fixed and the sensor target (10) is operatively connected to the shaft (3) in a rotationally fixed manner, the inner ring (5) being fixed to the shaft (3) in a current-insulating manner on its inner lateral surface (13) via a first insulation layer (11) and /or the outer ring (6) is fixed to the connection structure (2) in a current-insulating manner on its outer lateral surface (14) via a second insulation layer (12). Rolling bearing arrangement (1). Claim 1 , characterized in that the first insulation layer (11) and/or the second insulation layer (12) are/is formed from a current-insulating plastic. Rolling bearing arrangement (1). Claim 2 , characterized in that the first insulation layer (11) and/or the second insulation layer (12) are/is applied by means of a plastic injection molding process. Rolling bearing arrangement (1) according to one of the preceding claims, characterized in that the outer ring (6) has a radially inwardly pointing shoulder (15) on its outer lateral surface (14), on which the sensor (9) is attached via a fastening means (16). is fixed. Rolling bearing arrangement (1). Claim 4 , characterized in that the fastening means (16) is fixed to the shoulder (15) with the interposition of the second insulation layer (12). Rolling bearing arrangement (1) according to one of the preceding claims, characterized in that the inner ring (5) has on its inner lateral surface (13) a radially outward-pointing shoulder (17) to which the sensor target (10) is fixed. Rolling bearing arrangement (1). Claim 6 , characterized in that the sensor target (10) is fixed to the shoulder (17) with the interposition of the first insulation layer (11). Rolling bearing arrangement (1) according to one of the preceding claims, characterized in that the inner lateral surface (13) of the inner ring (5) is essentially cylindrical and the insulation layer (11) has a radial direction has an externally facing shoulder (19) to which the sensor target (10) is fixed. Rolling bearing arrangement (1) according to one of the preceding claims, characterized in that the sensor target (10) rests axially on the inner ring (5) on the one hand and on an axially position-secured securing sleeve (18) on the other hand. characterized in that electric machine (20), in particular within a drive train (40) of a motor vehicle (50), wherein the electric machine (20) has a stator (21) and a rotor (22) rotatably mounted relative to the stator (20). and the rotor (22) is arranged in a rotationally fixed manner on a rotor shaft (23), the rotor shaft (23) being in at least one rolling bearing arrangement (1) according to one of Claims 1 - 9 is stored.

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