DE102019133877A1 - Electric drive arrangement with a discharge device with integrated abrasion protection device - Google Patents

Abstract

There is an electric drive arrangement 1 with an electric motor section 2, the electric motor section 2 having an electric motor 3 with a rotor 6 and a shaft 4, the shaft 4 being electrically and gear-technically connected to the rotor 6, with a gear section 7, in which Gear section 7 a gear device 8 is arranged, the shaft 4 being connected to the gear device 8 in terms of transmission technology, with a discharge device 200 for discharging an electrical charge and / or voltage from the rotor 6 via the shaft 4 as a first discharge partner P1 to a second discharge partner P2, wherein the discharge device 200 has a support body device 210 for electrical and mechanical connection to one of the discharge partners P1, P2 and a contact device 220 for electrical connection to the other of the discharge partners P1, P2, proposed, wherein the discharge device 200 has at least one abrasion protection device 240, in which the abrasion protection device 240 is arranged on the side of the electric motor 3 of the contact device 220, so that a transfer of abrasion from the contact device 220 to the electric motor 3 is avoided or at least reduced.

Description

The invention relates to an electric drive arrangement for a vehicle, which has an integrated, electrical discharge device for a rotor of the electric drive arrangement.

In electric vehicles or hybrid vehicles, an electric machine is used as a traction motor. While on a superficial examination the electrical machine appears to work with little or no wear and in particular with very few problems, on closer examination problems arise which can be traced back to the functioning of the electrical machines. It is known that a voltage and / or charge is induced in the rotor of the electrical machine, so that a potential difference of several 100 V can build up between the rotor and a housing.

The rotor is usually designed in one piece with a rotor shaft or is mechanically connected; there is also an electrical contact between the rotor and the rotor shaft, so that the potential difference is present between the rotor shaft and the housing at the same time. The rotor shaft is usually mounted with respect to the housing via a rotor bearing or rotor shaft bearing. Due to the potential difference, discharges occur in the rotor shaft bearings between the rolling elements and the rolling element tracks, whereby the rolling element tracks are damaged.

The pamphlet DE 10 2012 219 819 A1 , which probably forms the closest prior art, discloses a transmission assembly for coupling to an electric drive machine in order to form a drive unit. The gear unit has a gear housing into which an input shaft is guided for the purpose of torque transmission. The input shaft is geared to the electric drive machine via a clutch. The transmission unit and the drive machine are arranged at a distance from one another.

The invention is based on the object of creating a drive arrangement for a vehicle which is characterized by a high level of operational reliability. This object is achieved by a drive arrangement with the features of claim 1. Preferred or advantageous embodiments of the invention emerge from the subclaims, the following description and the attached figures.

The invention relates to an electric drive arrangement which is suitable and / or designed for a vehicle. The vehicle is preferably designed as a passenger car, bus or truck. In alternative configurations, the vehicle can also be designed as a bicycle, motorcycle, e-scooter and / or single-lane or two-lane and / or single-axis or two-axis. The vehicle is designed as an electric vehicle, in particular as a purely electric vehicle or as a hybrid vehicle.

The electric drive arrangement serves in particular to create and / or provide a traction torque, in particular a main traction torque, for the vehicle. The electric drive arrangement can be coupled or coupled to an energy device, in particular to an energy storage device, in particular to a battery or accumulator, in order to obtain energy for generating the traction torque.

The electric drive assembly has an electric motor section. An electric motor, also referred to as an electric machine, is arranged in the electric motor section. The electric motor is preferably designed as an asynchronous electric motor. The electric motor preferably defines a main axis. The electric motor has a stator and a rotor which are arranged concentrically and / or coaxially with respect to one another. Furthermore, the electric motor section has a shaft, the shaft being connected to the rotor by means of a transmission. In particular, the shaft is driven via and / or by the rotor. The shaft is particularly preferably designed as a rotor shaft. In particular in the configuration as a rotor shaft, this can be connected to the rotor in a rotationally fixed, rigid and / or one-piece manner. It is also provided that the shaft is electrically connected to the rotor. As a result, if there is a potential difference between the rotor and a surrounding structure, the same potential difference is present between the shaft and the surrounding structure.

The electric drive arrangement has a gear section, a gear device being arranged in the gear section. The transmission device can be designed as a clutch device and / or as a shift device and / or as a transmission device. The shaft is connected to the transmission device in terms of transmission technology, in particular the shaft forms an input shaft into the transmission device.

The electric drive arrangement has a diverting device for diverting an electrical charge and / or electrical voltage starting from the rotor via the shaft, the shaft forming a first diverting partner. The derivation takes place to a second derivation partner. The second discharge partner is designed in particular as a stationary discharge partner. The second discharge partner is preferably in the form of a housing section or as a Surrounding structure or component formed, which is electrically conductively connected to the housing section. In particular, the housing section is connected to ground and / or grounded. In particular, the diverting device forms an electrical connection between the first diverting partner and the second diverting partner. In particular, there is a permanent electrical connection between the discharge partners, which is both stationary and dynamic, that is, when the electrical drive arrangement is in operation.

The diverting device has a supporting body device, which serves for, in particular, direct or indirect, mechanical connection to one of the diverting partners, in particular so that the diverting device is fixed to this diverting partner. Furthermore, the support body device serves for the, in particular direct or indirect, electrical connection with this discharge partner. The mechanical and electrical connection can coincide, but these can also be implemented next to one another or in parallel with one another. Furthermore, the diverting device has a contact device for electrical connection to the other of the diverting partners. The contact device is preferably indirectly connected on the one hand to the first-mentioned discharge partner via the support body device and, in principle, on the other hand, can be electrically connected directly to the other discharge partner. Alternatively, however, the contact device can also be electrically connected to the other discharge partner indirectly, e.g. via an electrically conductive intermediate component arranged on the shaft.

It is provided that the discharge device is designed to bridge an annular gap between the one and the other discharge partner. The discharge device preferably has a circular ring shape, the inside diameter and the outside diameter being adapted to or corresponding to the inside diameter or outside diameter of the respective discharge partner. The diverting device is preferably designed to be continuous in the direction of rotation around the main axis.

According to the invention, the discharge device has at least or precisely one abrasion protection device. The function of the abrasion protection device is to protect the electric motor against abrasion from the contact device. In particular, the abrasion is generated during operation of the electric motor due to friction during a relative movement between the two discharge partners. The abrasion protection device is arranged on the side of the electric motor of the contact device in order to avoid or at least reduce a transfer of the abrasion from the contact device to the electric motor. In particular, the abrasion protection device is designed and / or suitable to cover and / or seal a transition area between the support body device and the discharge partner that is directly or indirectly connected to the contact device. The abrasion protection device particularly preferably forms an abrasion-tight partition in the direction of rotation around the main axis.

Optionally, the diverting device can have a further abrasion protection device in order to avoid a transfer of the abrasion in the direction of the gear section. The abrasion protection device is arranged on the side of the gear device of the contact device in order to avoid or at least reduce a transfer of the abrasion from the contact device to the gear device and / or an entry of oil, in particular at the contact point between the contact device and the contacting discharge partner.

The advantage of the invention is, in particular, that the abrasion generated during operation of the electric motor is kept away from the electric motor and thus the function of the electric motor is not impaired. In this way, safe operation of the electric motor can be guaranteed. In addition, depending on the arrangement in the drive arrangement, the abrasion protection device can take on the function of an upstream seal, which is connected upstream of a sealing device and reduces the entry of further foreign particles, such as dust, moisture, etc.

In a preferred embodiment of the invention it is provided that the abrasion protection device extends circumferentially, in particular in the circumferential direction around the main axis, between the two discharge partners without interruption and / or overlapping to the contact device in order to shield the contact device from the electric motor in the circumferential direction. In particular, “uninterrupted” is to be understood as meaning that the abrasion protection device has no interruptions, openings or the like. In particular, “overlapping” is to be understood as meaning that the abrasion protection device and the contact device at least partially or completely overlap at least in one axial view with respect to the main axis. In particular, the abrasion protection device and the contact device are arranged and / or designed to be congruent with one another. The contact device and optionally the abrasion protection device are particularly preferably designed in the form of a ring or a circular ring. In particular, the abrasion protection device is designed as an annular sealing disk. The sealing disk is preferably arranged coaxially with respect to the axis of rotation, this delimiting and / or closing off an annular space formed between the two discharge partners in the direction of the electric motor. Thus becomes proposed an abrasion protection device which can be installed in a simple manner and at the same time provides a high level of protection against abrasion. In addition, an abrasion protection device is proposed which largely or even completely shields the contact device from the electric motor.

In a further preferred embodiment of the invention it is provided that the abrasion protection device has a circumferential sealing lip. In particular, a contacting, preferably dynamic, seal is implemented by the sealing lip. The sealing lip rests directly on a sealing partner in the circumferential direction. Preferably, at least the sealing lip is made of an elastic material, e.g. rubber, so that the sealing lip rests against the sealing partner in a sealing manner in the circumferential direction, in particular in a fluid-tight manner. In particular, the entire abrasion protection device is formed from the elastic material, so that it is flexible. The sealing partner can be formed by one of the discharge partners, in particular the shaft, or possibly by the intermediate component. The abrasion protection device is preferably implemented in the form of a wave lip seal. In particular, the abrasion protection device designed as a sealing washer has the sealing lip on its inner and / or outer circumference. An abrasion protection device is therefore proposed which is characterized by a particularly high level of impermeability, so that the entry of abrasion into the electric motor is significantly reduced or prevented.

In a constructive implementation it is provided that the support body device has a connection section, this serving for, in particular, direct or indirect, mechanical connection to one of the discharge partners, in particular so that the discharge device is fixed to this discharge partner. Furthermore, the connection section serves for the direct or indirect electrical connection with this discharge partner. The mechanical and electrical connection can coincide, but these can also be implemented next to one another or in parallel with one another. In addition, the support body device has a support section, this providing a connection interface for the mechanical and electrical connection of the at least one discharge component. The contact device and the abrasion protection device are jointly connected to the support section of the support body device.

In a first embodiment it is provided that the support section is flanged as an envelope around one edge of the contact device and the abrasion protection device in order to connect them to one another. In particular, the support body device, the contact device and the abrasion protection device are thus joined to one another, preferably non-detachably, by reshaping. The envelope is understood in particular to mean bending or folding an edge of the support section through 180 degrees. In particular, a cover is also understood to mean a so-called doubling or a so-called fold, which can be produced, for example, by folding or pivoting. Thus, a connection of the contact device and the abrasion protection device to the support body device is proposed, which is characterized by a particularly simple, material-saving and cost-effective joining process.

Optionally, the contact device and / or the abrasion protection device can additionally be connected to the support section by being pressed in. In particular, impressions are to be understood as meaning an indentation process in accordance with DIN 8583. The pressing in has the function of joining the contact device and / or the abrasion protection device to the support section by pressure forming. Here, the support section can be pressed in on one side or on both sides in the axial direction and at regular intervals in the direction of rotation by a suitable tool. For example, the support section and the contact device and / or the abrasion protection device can be connected to one another by notches or embossing or punching. It is therefore a consideration of the invention to propose a discharge device which is characterized by a particularly secure connection of the contact device and the abrasion protection device to the support section.

In an alternative or optionally supplementary embodiment, it is provided that the contact device and / or the abrasion protection device are additionally connected to the support section and / or the contact device is connected to the abrasion protection device by a material connection. In particular, the contact device and / or the abrasion protection device and / or the support section can be provided with an adhesive prior to flanging in order to fix the contact device and / or the abrasion protection device via an adhesive connection as the material connection to one another or to the support body device. Thus, the material connection ensures that the contact device and / or the abrasion protection device can preferably be connected to the support body device in a non-detachable manner.

In a second alternative embodiment, it is provided that the support body device has a support part and a holding part - hereinafter also referred to as parts - which together hold the contact device and the abrasion protection device and / or form the support section. Particularly preferred are the parts as metallic parts, in particular designed as formed sheet metal parts. In particular, the contact device and the abrasion protection device are arranged in the axial direction between the carrier part and the holding part. The carrier part and the holding part are preferably designed as two separate components, which are connected to one another in at least or precisely one connection area via a forming process. Clinching, toxing or clinching, for example, are used as forming processes. It is therefore a consideration of the invention to propose a discharge device which can be produced in a simple manner.

In one possible specification, one part has a connection opening and the other part has a deformation area which at least engages in the connection opening or even passes through it in order to form the deformation area, the at least one opening being kept free at the same time. For example, the reshaping area can be designed as an open hollow rivet area, the hollow rivet area having a hollow cylindrical neck, which is adjoined by a collar which forms a closing head. The collar rests circumferentially, preferably closed circumferentially, on an edge of the connection opening and in this way secures the connection. This manufacturing process can also be referred to as push-through riveting.

In a further embodiment it is provided that the connecting section is formed by spreading areas, preferably several spreading areas, in particular at least or precisely two spreading areas. The expansion areas serve in particular for mechanical and electrical connection with one of the discharge partners. The expansion areas are preferably formed by reshaping, so that the expansion areas extend at an angle from the support body device, in particular the holding part and / or the support part. By reshaping the expansion areas, the support body device is designed to be expandable against one of the discharge partners in order to form an expansion connection between the support body device and one of the discharge partners. The diverting device can preferably be supported and / or supported on one of the diverting partners in the radial direction in relation to the main axis via the expansion areas. The diverting device is preferably clamped resiliently on one of the diverting partners, so that a radial spring and / or spreading force acts to radially support the diverting device against one of the diverting partners. It is therefore a consideration of the invention to create a discharge device which is characterized by simple assembly.

In a first embodiment it is provided that the support body device has a base body area and at least one clamping area, the clamping area being connected to the base body area via at least one of the expansion areas. The base body area can preferably be seen as a supporting base body of the discharge device, the clamping area preferably forming a clamping connection with the contact device and the abrasion protection device. For this purpose, the contact device and the abrasion protection device are clamped between the base body area and the at least one clamping area. The clamping area preferably generates a clamping force in order to establish the clamping connection, the clamping force being transmitted and / or being transferable to the contact device and the abrasion protection device. The base body area, the expansion areas and the at least one clamping area are preferably designed in one piece. For example, at least the spreading area and the clamping area are made of a resilient and electrically conductive material, for example an electrically conductive metal. The support body device is particularly preferably designed as a serrated ring which is arranged concentrically to the shaft, the serrated ring having the base body area, the clamping areas and the multiple expansion areas. The expansion areas are preferably evenly spaced apart in the direction of rotation around the serrated ring. The serrated ring can be designed for bores with outer expansion areas or for shafts with inner expansion areas, the expansion areas for this purpose being arranged on an outer diameter or on an inner diameter of the toothed ring, depending on the design.

In a second alternative embodiment, it is provided that the support body device has an expansion support part with the expansion areas, the base body area as a support part and a support support part with at least one coupling area and the clamping area as a support part, the support support part being connected to the expansion support part via the coupling area. In particular, the contact device and the abrasion protection device are clamped between the clamping area and the base body area as already described above, the coupling areas securing the holding support part on the expansion support part, in particular in the radial and axial direction with respect to the shaft. In particular, the support body device is designed in two parts, the expansion support part and the holding support part being designed as two separate components. The coupling area is preferably designed to engage behind the expansion support part, the coupling area connecting the holding support part to the expansion support part in a non-positive and / or form-fitting manner. The holding support part preferably has a plurality of coupling areas, in particular at least or precisely two coupling areas. The coupling areas are, for example, as wings or as lobes or designed as prongs or as tabs, the coupling areas preferably being made of a flexible material, for example sheet metal. The holding support part and the expansion support part are preferably made of an electrically conductive material, for example an electrically conductive metal.

In principle, the contact device and / or the abrasion protection device can be directly mechanically connected to the base body area and / or the clamping area. Alternatively, the support body device has one or more connecting parts, the contact device and / or the abrasion protection device being indirectly mechanically connected to the base body area and / or the clamping area via the at least one connecting part. In particular, the connecting parts serve to enlarge a connecting surface between the base body area or the clamping area and the respective clamping partner. The connecting part is particularly preferably designed as a separate component which can also be inserted and / or clamped. The connector is preferably formed from an electrically conductive material such as an electrically conductive metal. Alternatively or optionally in addition, the connection part is made of a soft material, e.g. a plastic or aluminum material, so that in particular the clamping areas can claw and / or claw into the connection part or at least deform in a holding manner. In the case of a non-electrically conductive connection part, at least the base body area or the clamping area must be connected directly to the connection section in order to ensure electrical conductivity of the discharge device.

In a further embodiment it is provided that the discharge device has at least one opening which forms or helps to form an air passage in the annular gap in an axial direction. The opening cross section of the opening and / or of the air passage is preferably larger than 2 square millimeters, in particular larger than 4 square millimeters. In particular, the opening forms at least or precisely one channel that is continuous in the axial direction as an air passage or part of an air passage. The at least one opening can be designed as a through opening and is thus arranged in a radial area between the outer diameter and the inner diameter of the discharge device. In particular, the through opening is designed to be closed all round. Alternatively or in addition, the opening is designed as an opening at the edge which is delimited on a radial side by one of the discharge partners. This embodiment has the advantage that the circular ring of the discharge device is not weakened by the opening and is therefore more stable in continuous operation. It can be provided that the discharge device has at least one through opening and at least one edge-side opening. The at least one opening can be arranged in the support body device and / or in the contact device and / or the abrasion protection device. For example, the opening can be designed with a constant, free diameter in the axial course. The opening serves to reduce a pressure difference in a functionally reliable and, in particular, contamination-safe. By reducing the pressure difference, it is avoided that the discharge device is loaded in the axial direction and can shift or tilt in continuous operation.

In a further specification, it is provided that the discharge device has a sleeve. The sleeve is designed, in particular, as a separate component which is directly or indirectly connected and / or connectable to one of the discharge partners in a rotationally fixed manner. For this purpose, the sleeve has a cylinder section which is designed and / or suitable for electrical and mechanical connection to one of the discharge partners. The cylinder section can, for example, be connected directly to one of the discharge partners. Alternatively, however, the sleeve can also be connected indirectly to one of the discharge partners, e.g. via the intermediate component. The sleeve is preferably designed as a cylinder sleeve. In particular, the sleeve is non-rotatably connected to the rotating discharge partner, in particular the shaft. Alternatively, however, the sleeve can also be connected to the stationary discharge partner. For this purpose, the sleeve is pressed onto the rotating discharge partner, for example via the cylinder section, or, alternatively, it is pressed into the stationary discharge partner.

According to this embodiment, the sleeve has a flange section which is designed to bridge a radial distance between the contact device and the cylinder section and / or is suitable for indirectly electrically connecting the contact device to the discharge partner to be contacted. The sleeve thus serves as a bridge between the supporting body device and the discharge partner to be contacted. In particular, the flange section extends in a radial plane of the main axis. When the sleeve is arranged on the rotating discharge partner, the flange section is directed radially outward and extends radially in the direction of the stationary discharge partner. When the sleeve is arranged on the stationary discharge partner, the flange section is directed radially inward and extends radially in the direction of the rotating discharge partner. The sleeve is particularly preferably made of an electrically conductive material, for example silver or copper. Due to the electrical contacting of the contact device via the sleeve, a radial structural dimension of the Contact device can be significantly reduced. A more stable installation of the contact device can thus be implemented, so that lifting of the contact device, in particular due to centrifugal forces during operation of the electric motor, can be significantly reduced and the electrical connection can be guaranteed over the long term.

Furthermore, it can be provided that the flange section bridges more than half a radial width of an annular gap which is formed between the cylinder section and the connecting section. In particular, the flange section extends in the radial direction over more than 50%, preferably more than 65%, in particular more than 80% of the radial width of the annular gap. The annular gap is particularly preferably formed as an air gap surrounding the main axis, via which the two discharge partners are radially spaced from one another. By bridging a major part of the annular gap with the flange section, it can be ensured that particularly large radial distances can be bridged and at the same time the stability of the discharge device can be guaranteed. It can be provided that the at least one opening or optionally at least one further opening is arranged in the sleeve, in particular the flange section.

Alternatively or optionally in addition, it is provided that the sleeve has a run-on section which is designed and / or suitable for forming a run-on surface for the contact device and optionally for the abrasion protection device. The run-up section adjoins the flange section at an angle. In particular, at least the contact device rests in a sliding manner on the run-on surface, so that in particular there is permanent frictional contact between the contact device and the run-on surface. Optionally, the abrasion protection device, in particular the sealing lip, lies against the contact device in a sealing manner. For example, the contact surface can be coated in order to minimize friction between the contact device and the sleeve or between the abrasion protection device and the sleeve. The contact surface is preferably formed by a circumferential surface surrounding the main axis. The lateral surface preferably has a smooth, in particular uninterrupted, surface so that the contact device and / or the abrasion protection device comes into contact with the contact surface undisturbed or without interruption in the event of a relative rotation between the two discharge partners.

In a first embodiment, the run-on section can be formed by a cylindrical extension, so that the run-on surface is designed as a straight jacket surface. In particular, the cylindrical extension adjoins the flange section coaxially and / or concentrically to the cylinder section with respect to the main axis. The cylindrical extension and the cylinder section are preferably aligned with one another in the axial direction. When the sleeve is arranged on the rotating discharge partner, the contact surface is defined by an outer jacket surface of the cylindrical extension. When the sleeve is arranged on the stationary discharge partner, the contact surface is defined by an inner jacket surface of the cylindrical extension. A sleeve is thus proposed which is characterized by a particularly simple structure and also ensures permanent contact with the contact device.

In a second alternative embodiment, the run-on section can be formed by a frustoconical projection, so that the run-on surface is designed as an inclined lateral surface. In particular, the frustoconical extension adjoins the flange section coaxially to the cylinder section with respect to the main axis. The frustoconical extension and the cylinder section are preferably directed opposite one another in the axial direction. As a result of the inclined approach of the contact device on the sleeve, a discharge device is proposed which is particularly easy to assemble.

In a further embodiment of the invention it is provided that the contact device has a contact section, this serving for the electrical connection to the discharge partner. In addition, the contact device has a connection section via which the contact device is connected to the support body device, in particular the support section of the support body device. The connection section is preferably indirectly connected to the other discharge partner via the support body device, in particular the support section. In principle, the contact section can be designed as desired in its basic shape.

In principle, the contact section can be formed by one or more, preferably elastically deformable, filaments, strips or circular ring segments. However, the contact section and / or the contact device is preferably designed as an annular or circular ring-shaped component, the contact section preferably being designed concentrically to the shaft and / or to the housing section. In its basic form, the contact section is particularly preferably designed as an open or closed annular disk and / or round blank, the contact section having an opening, in particular a central hole, for receiving the shaft. The contact section is preferably deformed and / or deformable in the axial direction in the shape of a plate or a wave.

In principle, the contact device and / or the support body device can be manufactured from an electrically conductive metal or a metal alloy, for example steel, copper or aluminum. In particular, the contact device and the support body device can be made of different electrically conductive materials.

Alternatively, the contact device and / or the support body device is made of a composite material and / or a composite material which have electrically conductive properties. For example, the composite material is made from a graphite-copper-resin composite mixture.

Alternatively, the contact device and / or the support body device is provided with an electrically conductive coating. For example, the coating can be applied to the contact section as a particle, layer or fiber composite material.

Alternatively, the contact device, in particular the contact section, can be formed from electrically conductive fibers. In particular, these fibers can be present as loose fibers, as a yarn or as a woven fabric. As a fabric, the electrically conductive fibers can be processed into a felt or into a woven, embroidered or tufted fabric layer, for example. The fabric can be made entirely or partially from electrically conductive fibers and partially from other fibers, e.g. plastic fibers. The electrically conductive fibers are preferably designed as metallic fibers or as filled or coated polymer fibers, but particularly preferably as carbon fibers.

According to this embodiment, the contact device has electrically conductive fibers and an adhesive layer for embedding the electrically conductive fibers, the electrically conductive fibers being arranged on the contact section for making contact with the one discharge partner. The conductive fibers are preferably arranged on the contact section at least in a region of the contact point. The adhesive layer is used to materially connect the electrically conductive fibers to the contact section. The adhesive layer preferably forms an adhesive bed for the electrically conductive fibers. The adhesive layer is preferably formed from an electrically conductive adhesive, the adhesive being formed, for example, as a dispersion adhesive or as a solvent-based adhesive. The adhesive layer is applied to the contact section, the adhesive layer preferably being able to be applied and / or used up on the contact section by spraying, rolling, painting or by dipping the contact section or by a pad printing or a screen printing process. In particular, the adhesive layer is curable, so that the electrically conductive fibers can be introduced into the adhesive layer in a wet and / or liquid and / or viscous state and, after the adhesive layer has hardened and / or solidified, are firmly bonded to the contact section. The electrically conductive fibers are preferably embedded with one of their ends in the adhesive layer, the other ends being designed as free ends of the electrically conductive fibers. In particular, the free ends of the electrically conductive fibers can be placed against the discharge partner to be contacted and / or rest against it. The electrically conductive fibers are preferably held elastically in the adhesive layer so that when the electrically conductive fibers are in contact with one of the discharge partners, flexible deformation of the electrically conductive fibers creates a dimensional overlap between the electrically conductive fibers and one of the discharge partners. The electrically conductive fibers preferably have a fiber length of at least 0.3 mm, in particular at least 0.2 mm, in particular at least 0.1 mm, the electrically conductive fibers preferably having a maximum fiber length of 5 mm, in particular a maximum of 10 mm , in particular of a maximum of 20 mm.

In a further possible specification, the conductive fibers are designed as flock fibers for flocking the contact section. The flock fibers preferably have a uniform fiber length and / or the same fiber thickness. The flock fibers are designed to be electrically conductive, the flock fibers being electrically conductive due to their material per se and / or due to an electrically conductive coating of the flock fibers. The flock fibers are preferably applied to the contact section in a flocking process. In principle, the flock fibers can be applied to the contact section with any flocking method, for example in a form flocking, a surface flocking, an electrostatic flocking or an electrostatic-pneumatic flocking method. The contact section with the flock fibers is preferably electrostatically flocked, the contact section preferably being designed as a carrier substrate for the flock fibers and having the adhesive layer.

In electrostatic flocking, the flock fibers are applied into the wet adhesive in an electrostatic field between an anode and a cathode, in particular between an applicator with anode and the contact section as cathode. The flock fibers adhere to the adhesive layer, with the flock fibers forming a flock pile on the area of the that is wetted with adhesive Forms contact portion. The flock fibers align themselves in the electrostatic field, so that the flock fibers are preferably aligned as a result of the process, for example perpendicular to a surface of the contact section. Alternatively or optionally in addition, with this or another flocking method, the flock fibers are directed in a targeted manner, for example can be applied and / or applied with an angular offset to the surface of the contact section or anchored in an arbitrary alignment of the individual flock fibers with the adhesive layer. It is advantageous that through a targeted alignment of the flock fibers, the electrical contact with one of the discharge partners can be improved and undesired frictional resistance, for example through flock fibers aligned against a direction of rotation of the shaft, can be reduced.

In a further possible embodiment, the electrically conductive fibers are designed as carbon fibers. The carbon fibers, also referred to as carbon fibers or carbon fibers or carbon fibers, are preferably made from a carbon-containing starting material which can be carbonized to carbon in a pyrolysis process. The carbon fibers are designed to be electrically conductive and are preferably applied to the contact section using the flocking method. The carbon fibers are embedded in the adhesive layer, the adhesive layer bonding the carbon fibers to the contact section in a materially bonded manner. The contact section is electrically connected to one of the discharge partners via the carbon fibers, in particular the carbon fibers form the sliding contact between the contact section and one of the discharge partners. Alternatively, the electrically conductive fibers are designed as derivatives of carbon fibers, as metallic fibers or as filled polymer fibers.

In a further embodiment it is provided that the electric drive arrangement has a separating section, the separating section being arranged between the electric motor section and the gear section, in particular in the axial direction to the main axis. The partition section comprises a partition wall between the electric motor section and the transmission section. In particular, the electric motor section has an engine compartment and the transmission section has at least one gear compartment, the separating section separating the engine compartment from the adjoining gear compartment, in particular separating it in a dirt-tight or oil-tight manner. For example, the electric motor section has a sub-motor housing and the gear section has a sub-gear housing, the separating section being arranged in a separating manner between the sub-motor housing and the sub-transmission housing. The motor part housing and the transmission part housing together preferably form a housing for the electrical drive arrangement. The electric motor section is preferably designed as a dry area. The gear section, in particular the adjoining gear compartment, is optionally implemented as an oil area or as a dry area. In the event that this is implemented as a dry area, the separating section forms a dirt-tight separation. In the event that this is implemented as an oil area, the partition section forms an oil-tight partition.

The shaft, in particular the rotor shaft, is passed through the separating section and is sealed off from the separating section with a sealing device. The sealing device can be designed as a contacting sealing device or as a contactless sealing device, in particular as a gap seal. For example, the sealing device is designed as a shaft leadthrough.

It is further proposed that the discharge device is arranged on a motor side of the sealing device and / or in the electric motor section. The diverting device is thus arranged on the side of the electric motor in relation to the sealing device. This has the advantage that the electrical / electronic components are all arranged on the side of the electric motor section, so that responsibility for the electrical / electronic conversion is assigned to the electric motor section and responsibility for the mechanical conversion to the gear section. In addition, the discharge device is installed where the electrical charge and / or electrical voltage arises in the rotor, so that it can be dissipated spatially close. In particular, the discharge device is arranged in the axial direction with respect to the main axis between the rotor and the sealing device. In this way, the diverting device is shifted to the side of the electric motor which faces the sealing device. The remaining space which is available between the bearing device arranged on the transmission side and the sealing device can thus be used for the discharge device.

For example, the discharge device can be arranged between the bearing device and the sealing device. With this configuration, the discharge device is moved from the free end of the rotor shaft in the electric motor section further into the center of the rotor shaft, so that the voltage and / or the electrical charge can be diverted centrally from the rotor shaft as discharge partner to the other discharge partner. In addition, the gear section with the gear unit is particularly protected by the position, so that any bearings in the gear unit cannot suffer any damage through the passage of current. Alternatively, the discharge device on the Sealing device can be arranged facing away from the side of the bearing device. In particular, the discharge device is arranged between two bearing devices, the two bearing devices forming or co-forming the rotor bearing.

• 1 eine schematische Darstellung einer Antriebsanordnung mit einer Ableitvorrichtung als ein Ausführungsbeispiel der Erfindung;
• 2 die Antriebsanordnung in gleicher Darstellung wie 1 als ein weiteres Ausführungsbeispiel der Erfindung;
• 3 eine stark schematisierte Darstellung der Ableitvorrichtung der 1 und 2;
• 4 eine Schnittdarstellung der Ableitvorrichtung der 1 bis 3;
• 5 eine Schnittdarstellung der Ableitvorrichtung aus 4 in einer Einbausituation;
• 6 eine Schnittdarstellung einer Lagereinheit mit der Ableitvorrichtung der 4;
• 7 eine Schnittdarstellung einer alternativen Ausführung der Ableitvorrichtung der 1 bis 3;

Further features, advantages and effects of the invention emerge from the following description of preferred exemplary embodiments of the invention. It shows:

• 1 a schematic representation of a drive arrangement with a discharge device as an embodiment of the invention;
• 2 the drive arrangement in the same representation as 1 as a further embodiment of the invention;
• 3 a highly schematic representation of the discharge device of 1 and 2 ;
• 4th a sectional view of the discharge device of 1 to 3 ;
• 5 a sectional view of the discharge device 4th in an installation situation;
• 6th a sectional view of a storage unit with the discharge device of 4th ;
• 7th a sectional view of an alternative embodiment of the discharge device of FIG 1 to 3 ;

1 shows a schematic representation of an electric drive arrangement 1 for a vehicle, not shown, as an embodiment of the invention. For example, the vehicle can be designed as a single or multi-lane and / or as a single or multi-axle vehicle. For example, the vehicle is a purely electric vehicle or a hybrid vehicle. The vehicle can be designed, for example, as a passenger car, bus or truck. Alternatively, however, the vehicle can also be designed, for example, as a bicycle (pedelec), motorcycle (electric motorcycle) or e-scooter.

The drive arrangement 1 serves to generate and / or provide a traction torque, in particular a main traction torque, for the vehicle. To this end, the drive arrangement 1 an electric motor section 2 on which an electric motor 3 for generating the traction torque and a wave 4th for the transmission of the traction torque. The electric motor 3 can be electrically connected to an energy device, for example a battery or an accumulator, in order to obtain energy for generating the traction torque. The electric motor 3 can for example be designed as a direct current, synchronous or asynchronous motor.

The electric motor 3 has a stator 5 and a rotor 6th on. The rotor 6th is with the wave 4th drive connected so that the shaft 4th over and / or through the rotor 6th is driven. The wave 4th is thus designed as a rotor shaft and is for this purpose mechanically, for example non-rotatable, and electrically with the rotor 6th connected. The wave 4th defines a main axis with its axis of rotation H , with the stator 5 and the rotor 6th with respect to the main axis H are arranged coaxially and / or concentrically to one another.

For the rotatable mounting of the shaft 4th has the electric motor section 2 a first and a second storage device 110 , 120 on, with the wave 4th about the storage facilities 110 , 120 in the radial direction on the stator 5 are supported. The storage facilities 110 , 120 are each designed as a ball bearing, in particular a deep groove ball bearing, in the exemplary embodiment shown.

Furthermore, the electric drive arrangement 1 a gear section 7th on, which for the transmission and / or translation and / or distribution of the traction torque of the electric motor 3 serves. This is in the gear section 7th a transmission device 8th , only indicated schematically, arranged, wherein the transmission device 8th a clutch device, for example a positive or positive-locking clutch, and / or a shift device, for example an electrically and / or hydraulically actuated shift cylinder, and / or a transmission device, for example a planetary and / or stepped gear. The electric motor section 2 and the gear section 7th are about the wave 4th connected to each other by transmission technology, the shaft 4th an input shaft into the transmission device 8th forms. Via an output shaft 9 For example, the traction torque can be passed on to one or more wheels of the vehicle.

Furthermore, the electric drive arrangement 1 a partition section 10 on, which is an engine room of the electric motor section 2 from an adjacent gear space of the gear section 7th separates. The separation section 10 is for this purpose in the axial direction with respect to the main axis H between the electric motor section 2 and the gear section 7th arranged. For example, the engine compartment can be a dry area and the adjoining gear compartment can be a further dry area or an oil area, the separating section 10 a dirt-tight and optionally an oil-tight partition between the electric motor section 2 and the gear section 7th forms. The wave 4th is through the separating section 10 out and over a sealing device 11 opposite the separating section 10 sealed. The sealing device 11 can, for example, be used as a contacting sealing device, for example a shaft sealing ring, or as a Contactless sealing device, for example a gap seal, can be formed.

In a motor operation of the electric motor 3 discharge currents can be caused, which spread over the storage facilities 110 , 120 unload and the storage facilities 110 , 120 can damage. The electrical drive arrangement 1 a diverter 200 on, which for the derivation of an electrical charge and / or electrical voltage starting from the rotor 6th over the wave 4th , as a first lead partner P1 , to a second lead partner P2 serves.

The second lead partner P2 forms compared to the first discharge partner P1 , so the wave 4th , a stationary discharge partner. The second lead partner P2 can for example by the stator 5 itself and / or by a housing section, for example a motor housing, and / or a surrounding structure, for example a chassis, and / or a component that connects to the stator 5 , the housing section or the surrounding structure is electrically conductively connected, be formed. The discharge device 200 forms an electrical connection between the first discharge partner P1 and the second lead partner P2 . The second discharge partner is here P2 connected to ground and / or grounded so that the shaft 4th via the discharge device 200 is grounded. For this purpose, the discharge device forms 200 a current path with a lower resistance to the storage facilities 110 , 120 so that the discharge currents parallel to the storage facilities 110 , 120 be derived. The two discharge partners P1 , P2 are about the discharge device 200 constantly electrically connected to one another, with an electrical discharge taking place both stationary and dynamically, i.e. in engine operation.

In the embodiment shown is the discharge device 200 in the axial direction with respect to the main axis H between the first storage facility 110 and the partition section 10 in the electric motor section 2 arranged. Thus is the diverter 200 in relation to the first storage facility 110 arranged on the side near the transmission in the engine compartment. Through this position close to the gear, the gear section 7th be protected from discharge currents, so that any bearings in the transmission device 8th suffer no damage.

2 shows the drive arrangement 1 in the same representation as 1 as a further embodiment of the invention. In the embodiment shown is the discharge device 200 in the axial direction with respect to the main axis H between the rotor 6th and the first storage facility 110 in the electric motor section 2 arranged. Thus is the diverter 200 in relation to the first storage facility 110 arranged on the side close to the engine in the engine compartment. Due to this position close to the engine, the discharge device 200 be installed where the electrical charge and / or electrical voltage in the rotor 6th arises so that this can be dissipated spatially close.

3 shows the discharge device 200 in a highly schematic block diagram, the individual blocks being defined as functional blocks and optional configurations being indicated by dotted lines.

The discharge device 200 has a support body device 210 and a contact device 220 on, the contact device 220 with the support body device 210 is electrically and mechanically connected. To this end, the supporting body device 210 a support section 211 and the contact device 220 a connection section 221 on, the contact device 220 via the connection section 221 on the support section 211 for example, form-fitting and / or materially and / or non-positively connected.

Furthermore, the supporting body device 210 a connecting section 212 on, which is directly attached to the support section 211 connects. The connecting section 212 serves the support body device 210 at the second lead partner P2 mechanically and electrically. The mechanical and electrical connection can coincide, but these can also be implemented next to one another or in parallel with one another. The connecting section 212 can directly with the second discharge partner P2 be connected and / or rest against it. Alternatively or optionally in addition, the connecting section 212 Via an intermediate component, not shown, indirectly with the second discharge partner P2 be connected.

The contact device 220 has a contact portion 222 on, which is directly on the connection section 221 connects. The contact section 222 212 serves the purpose of the contact device 220 with the first lead partner P1 to contact electrically conductive. The shaft rotates when the motor is running 4th , so the first lead partner P1 to the main axis H , the diverter 200 stationary at the second discharge partner P2 remains and the two discharge partners P1 , P2 via the contact section 222 are permanently in electrically conductive contact with one another. The contact section 222 can directly with the first discharge partner P1 , so the wave 4th , be electrically connected and / or rest against it. Alternatively, the contact portion 222 but also via a sleeve 230 , as an optional intermediate component, indirectly with the first discharge partner P1 be electrically connected.

In engine operation, the relative rotation between the two discharge partners P1 , P2 abrasion at the contact point of the contact section 222 with the wave 4th or the sleeve 230 arise. This abrasion can have electrically conductive particles, which are produced by the electric motor 3 must be kept away. To this end, the diverting device 200 optionally an abrasion protection device 240 on which the electric motor 3 protects against abrasion. The abrasion protection device 240 is on the side of the electric motor 3 the contact device 220 arranged to transfer the abrasion to the electric motor 3 to avoid. The abrasion protection device 240 is common with the contact device 220 to the support section 211 the support body device 210 tied up. The abrasion protection device 240 is designed for example in such a way that it covers the entire contact device 220 or at least the contact point between the contact section 220 and the wave 4th or the sleeve 230 compared to the electric motor 3 with respect to the main axis H shields and / or seals both in the axial direction and in the circumferential direction. This forms the abrasion protection device 240 an abrasion-tight partition between the first bearing device 110 and the sealing device 10 like this in the 1 is shown. Alternatively forms the abrasion protection device 240 an abrasion-proof partition between the rotor 6th and the first storage facility 110 like this in the 2 is shown.

Optionally, the discharge device 200 another abrasion protection device 250 have in order to transfer the abrasion in the other direction, in particular to the gear section 7th to avoid. The further abrasion protection device 250 is common with the abrasion protection device 240 and the contact device 220 to the support section 211 the support body device 210 tied up. The abrasion protection device 240 is designed for example in such a way that it covers the entire contact device 220 or at least the contact point between the contact section 220 and the wave 4th or the sleeve 230 opposite the gear section 7th with respect to the main axis H shields and / or seals both in the axial direction and in the circumferential direction. Through the further abrasion protection device 250 can thus the abrasion between the two abrasion protection devices 240 , 250 be enclosed or encapsulated, so that a transfer to the electric motor 3 , e.g. through in the discharge device 200 arranged openings, can be excluded. In addition, the entry of foreign particles from the gear section 7th , e.g. oil, to the contact point of the contact device 220 through the further abrasion protection device 250 be prevented.

The discharge device 200 serves to bridge an annular gap between the two discharge partners P1 , P2 , the diverter 200 optionally at least one opening 260 in the annular gap to form an air passage in the axial direction. For example, the opening 260 be formed by at least or exactly one through opening, for example one or more bores or one or more openings, or by at least or precisely one edge-side opening, for example one or more cutouts. It is conceivable that a large number of through openings form a grid-like structure, for example, in order to transfer solids, in particular the abrasion, to the electric motor 3 to prevent or at least reduce.

The opening 260 , here indicated schematically by a dashed line, can optionally be in the support body device 210 and / or the contact device 220 be brought in. For example, the opening 260 in the support section 211 and / or the connection section 221 and, if necessary, in the abrasion protection device 240 and / or the further abrasion protection device 250 be brought in. Alternatively, the opening 260 or optionally a further opening in the contact section 222 and, if necessary, in the abrasion protection device 240 and / or the further abrasion protection device 250 be brought in. Alternatively, the opening 260 or optionally another opening in the sleeve 230 be brought in.

4th shows the discharge device 200 in a sectional view as an embodiment of the invention. The supporting body device 210 has a carrier part 214 and a holding part 215, which together form the contact device 220 and the abrasion protection device 240 hold. The two parts 214, 215 are designed, for example, as rotationally symmetrical, in particular ring-shaped, sheet metal components which are inserted concentrically into one another and, for example, non-positively, e.g. by means of a press connection, and / or positively, e.g. by clinching, toxening or clinching, and / or materially, e.g. by Welding, connected to each other. The radially outer part is formed by the support part 214 and the radially inner part by the holding part 215.

The abrasion protection device 240 is in the axial direction between the holding part 215 and the contact device 220 arranged, wherein the abrasion protection device 240 the contact device 220 compared to the electric motor 3 , especially the rotor 6th , completely shields. The abrasion protection device 240 is for this purpose in the circumferential direction and in the radial direction without interruption and / or overlapping with the contact device 220 arranged so that the contact device 220 through the abrasion protection device 240 is covered. For example, can the abrasion protection device 240 be designed as a flow or rubber washer.

The abrasion protection device 240 is circular and has a sealing lip on its inner diameter 241 on. The sealing lip 241 serves, for example, for the circumferential installation of the abrasion protection device 240 on the shaft 4th to the electric motor 3 against the abrasion of the contact device 220 to seal. Through the sealing lip 241 a dynamic, in particular rotary seal is thus implemented in order to transfer abrasion to the electric motor 3 to prevent.

Optionally, the additional abrasion protection device 250 , as in 3 described, in the axial direction between the contact device 220 and the carrier part 214, wherein the further abrasion protection device 250 the contact device 220 opposite the gear section 7th completely shields. The additional abrasion protection device is used for this 250 to do this, the gear section 7th against the abrasion of the contact device 220 to shield and / or to prevent foreign particles from entering the gear section 7th , e.g. oil, to the contact point of the contact device 220 to prevent.

In addition, the supporting body device 210 a support section 213 on, which is angled to form a support bracket on the support section 211 , in particular the carrier part 214, adjoins. The contact device is supported here 220 , especially the contact section 222 , as well as the abrasion protection device 240 together on the support section 213 so that it is angled on the sleeve 230 issue. For example, the support section 213 with a support angle of approx. 45 degrees compared to the support section 211 angled. Through the support section 213 can on the one hand the clamping connection of the contact device 220 and the abrasion protection device 240 between the two parts 214, 215 can be improved. On the other hand, a more stable installation of the contact section can be achieved 222 and the sealing lip 241 to the corresponding discharge partner P1 , P2 guaranteed.

5 shows the discharge device in a sectional view 200 with the sleeve 230 in an installation situation. The sleeve 230 has a cylinder section 231, a flange section 232 and a run-on section 233, the flange section 232 directly adjoining the cylinder section 232 in the radial direction and the run-on section 233 in turn adjoining the flange section 232 at an angle. The sleeve 230 is designed, for example, as a further rotationally symmetrical, in particular ring-shaped, sheet metal component. The sleeve 230 is at the first discharge partner via the cylinder section 231 P1 , e.g. the wave 4th , mounted and can be fixed on this, for example via a press fit, so that the sleeve 230 in motor operation in the direction of rotation around the main axis H is taken. The run-on section 233 forms a run-on surface on which the contact section 222 and the sealing lip 241 are present together and can start up in motor operation.

The flange section 232 has the function of a radial distance A between the contact section 222 and the first lead partner P1 or the cylinder section 231 to be bridged. For this purpose, the flange section 232 extends in the radial direction over more than half the radial width of the annular gap which is between the two discharge partners P1 , P2 is formed. Thus, the contact device 220 be formed with a small radial width, so that the contact on the run-on portion 233 can be improved.

The approach section 233 is designed as a cylindrical extension, which preferably adjoins the flange section 232 at right angles. The cylinder section 231 and the run-on section 233 are aligned coaxially and / or in the same direction with one another. The run-on section 233 thus defines a run-on surface for the contact section 222 , which is formed by a straight cylinder jacket surface of the contact section 233.

The 6th shows a storage unit in a sectional view 300 , the storage unit 300 the first storage facility 110 the 1 and 2 as well as the discharge device 200 , as in 3 described, includes. The discharge device 200 and the storage facility 110 form a common unit, the discharge device 200 and the storage facility 110 are connected to each other for this purpose.

The first storage facility 110 is designed as a deep groove ball bearing and thus serves to support the shaft radially and axially 4th in the electric motor section 2 . The first storage facility 110 has a first bearing ring 111 and a second bearing ring 112 on, with between the two bearing rings 111 , 112 a series of rolling elements 113 , in particular balls, are arranged rolling. Here is the first bearing ring 111 as a bearing inner ring and the second bearing ring 112 designed as a bearing outer ring. The first bearing ring 111 is, for example, electrically and mechanically, in particular non-rotatably, as a first intermediate component with the first discharge partner P1 and the second bearing ring 112 is, for example, electrically and mechanically, in particular non-rotatably, as a second intermediate component with the second discharge partner P2 connected.

The first bearing ring 111 has a first attachment portion 114 and the second bearing ring 112 has a second attachment portion 115 on, which are each on an axial end face of the associated bearing ring 111 , 112 are molded. The two fastening sections 114 , 115 are each designed as a cylindrical extension and opposite the associated bearing ring 111 , 112 stepped in the radial direction.

On the first fastening section 114 is a sleeve 230 , as in 3 described, arranged radially on an outer circumference and rotatably connected to this. For example, the sleeve 230 on the first fastening section 114 be pressed on. The supporting body device 210 is about the connection section 212 radially on an inner circumference of the second fastening section 115 arranged and rotatably connected to this. For example, the support body device 210 in the second fastening section 115 be pressed in.

The sleeve 230 has the cylinder portion 231 and the flange portion 232, the sleeve 230 Via the cylinder section 231 on the circumferential side on the first fastening section 114 is mounted. The sleeve 230 is rotationally fixed on the fastening section 114 set so that the sleeve 230 in motor operation in the direction of rotation around the main axis H through the one on the wave 4th mounted first bearing ring 111 is taken. The outer circumference of the cylinder section 231 forms a contact surface on which the contact section 222 and the sealing lip 241 start in motor operation. The flange portion 232 in this embodiment has the function of the accumulated abrasion from the bearing device 110 keep away, so that an entry of abrasion and damage to the storage facility 110 is prevented.

7th shows a further alternative embodiment of the discharge device 200 in an installation situation. Here is the support section 211 as an envelope around an edge of the connecting portion 221 and the abrasion protection device 240 flanged so that the contact device 220 and the abrasion protection device 240 through the support section 211 are held clamped. The supporting body device 210 is designed as a rotationally symmetrical, in particular ring-shaped, sheet metal component, which is used to form the support section 211 is flanged from the outside to the inside. The envelope is made, for example, by bending or folding a radially outer edge of the support section 211 understood by 180 degrees, with a rounding is produced at the point of the edges by the envelope, which at the same time the connecting section 212 the support body device 210 forms. For example, the discharge device 200 this via the connection section 212 in the radial direction with respect to the main axis H on one of the discharge partners P1 , P2 and / or on one of the bearing rings 110 , 111 non-rotatably supported, for example via a press fit.

List of reference symbols

1

Drive arrangement

2

Electric motor section

3

Electric motor

4th

wave

5

stator

6th

rotor

7th

Gear section

8th

Transmission device

9

Output shaft

10

Separation section

11

Sealing device

110

first storage facility

111

first bearing ring

112

second bearing ring

113

Rolling elements

114

first fastening section

115

second fastening section

120

second storage facility

200

Discharge device

210

Support body device

211

Support section

212

Connection section

213

Support section

220

Contact device

221

Connection section

222

Contact section

230

Sleeve

240

Abrasion protection device

241

Sealing lip

250

further abrasion protection device

260

opening

300

Storage unit

H

Main axis

P1

first discharge partner

P2

second discharge partner

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed 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

• DE 102012219819 A1 [0004]

Claims (11)

Electric drive arrangement (1) with an electric motor section (2), the electric motor section (2) having an electric motor (3) with a rotor (6) and a shaft (4), the shaft (4) being electrical with the rotor (6) and is connected in terms of transmission technology, with a transmission section (7), a transmission device (8) being arranged in the transmission section (7), the shaft (4) being connected in terms of transmission technology to the transmission device (8), with a diverting device (200) for Discharge of an electrical charge and / or voltage from the rotor (6) via the shaft (4) as a first discharge partner (P1) to a second discharge partner (P2), the discharge device (200) having a support body device (210) for electrical and mechanical Connection to one of the discharge partners (P1, P2) and a contact device (220) for electrical connection to the other of the discharge partners (P1, P2), characterized in that the discharge device (200) has at least one Has abrasion protection device (240), the abrasion protection device (240) being arranged on the side of the electric motor (3) of the contact device (220), so that a transfer of abrasion from the contact device (220) to the electric motor (3) is avoided or at least reduced becomes. Electric drive arrangement (1) according to Claim 1 , characterized in that the abrasion protection device (240) extends circumferentially between the two discharge partners (P1, P2) without interruption and / or overlapping to the contact device (220), so that the contact device (220) is shielded in the circumferential direction by the abrasion protection device (240) . Electric drive arrangement (1) according to Claim 1 or 2 , characterized in that the abrasion protection device (1) has a circumferential sealing lip (241), wherein the sealing lip (241) rests directly or indirectly on one of the discharge partners (P1, P2) in the circumferential direction. Electric drive arrangement (1) according to one of the preceding claims, characterized in that the support body device (210) has a connection section (212) for electrical and mechanical connection to one of the discharge partners (P1, P2) and a support section (211), wherein the contact device (220) and the abrasion protection device (240) are jointly connected to the support body device (210) via the support section (211). Electric drive arrangement (1) according to Claim 4 , characterized in that the support section (211) is flanged as an envelope around an edge of the contact device (220) and the abrasion protection device (240) in order to connect the contact device (220) and the abrasion protection device (240) with the support body device (210) connect. Electric drive arrangement (1) according to Claim 4 , characterized in that the support body device (210) has a support part (214) and a holding part (215) which together hold the contact device (220) and the abrasion protection device (240) and / or form the support section (211), the support part (214) and the holding part (215) are connected to one another in at least one connection area via a forming process. Electric drive arrangement (1) according to one of the Claims 4 to 6th , characterized in that the support body device (210) has expansion areas for the expansion connection of the support body device (210) with one of the discharge partners (P1, P2), the expansion areas forming the connecting section (212). Electric drive arrangement (1) according to one of the preceding claims, characterized in that the diverting device (200) has at least one opening (260) which forms or co-forms an air passage in an annular gap in an axial direction, which between the two diverting partners (P1, P2) is formed. Electric drive arrangement (1) according to one of the preceding claims, characterized in that the discharge device (1) has a sleeve (230), the sleeve (230) having a cylinder section (231) for electrical and mechanical connection to one of the discharge partners (P1, P2) and has a flange section (232) for bridging a radial distance (A) between the contact device (220) and the cylinder section (231), so that at least the contact device (220) indirectly via the sleeve (230) with the discharge partner to be contacted (P1, P2) is electrically connected. Electric drive arrangement (1) according to one of the preceding claims, characterized in that the contact device (220) has a contact section (222) for electrical connection to the discharge partner (P1, P2) and that the contact device (220) has a connection section (221) for electrical and mechanical connection to the support body device (210), wherein the contact device (220) has electrically conductive fibers and an adhesive layer, the electrically conductive fibers are embedded in the adhesive layer, and wherein the electrically conductive fibers on the contact section (222) are arranged for electrical connection with one of the discharge partners (P1, P2). Electric drive arrangement (1) according to one of the preceding claims, characterized by a separating section (10), the separating section (10) being arranged between the electric motor section (2) and the gear section (7) and by a sealing device (11) for sealing the shaft (4) when passing through the separating section (10), the discharge device (200) being arranged on a motor side of the sealing device (11) and / or in the electric motor section (2).

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