DE102020108834A1 - Electric drive arrangement for a vehicle - Google Patents

Abstract

The invention relates to an electric drive arrangement 1 for a vehicle with an electric drive section 2 which has an electric drive 3 with a rotor 6 and which has a shaft 4 which is connected to the rotor 6 and wherein the shaft 4 defines a main axis H, with a gear section 7, which is arranged a gear device 8, the shaft 4 being connected to the gear device 8 in terms of transmission technology, with a housing 11, the shaft 4 being rotatably mounted relative to the housing 11, the housing 11 having a housing section 15 comprises, with a diverting device 20 for diverting an electrical charge and / or voltage from the rotor 2 via the shaft 4 to the housing section 15, the diverting device 20 having a first diverting device 24 for connection to the shaft 4 and a second diverting device 25 for connection to the housing section 15, wherein the first diverting device 24 in an interior of the Shaft 4 is arranged and wherein the first diverting device 24 has a contact surface 30 for the second diverting device 25, wherein the contact surface 30 is arranged concentrically to the main axis H.

Description

Field of invention

The invention relates to an electric drive arrangement for a vehicle with an electric drive section, the electric drive section having an electric drive with a rotor and the electric drive section having a shaft which is connected to the rotor and which defines a main axis. The electric drive arrangement comprises a transmission section in which a transmission device is arranged, the shaft being connected to the transmission device in terms of transmission technology. The electric drive arrangement comprises a housing, the shaft being mounted rotatably relative to the housing, the housing comprising a housing section. The electric drive arrangement comprises a diverting device for diverting an electrical charge and / or voltage from the rotor via the shaft to the housing section, the diverting device comprising a first diverting device for connection to the shaft and a second diverting device for connection to the housing section, the first Diverting device is arranged in an interior of the shaft.

Background of the invention

In drive modules for vehicles, electric drives are used to generate the drive torque. As a result of very strong voltage edges in the voltage supply of the electric drive, undesired electric currents are generated in the electric drive. The electrical currents flow through the housing, the shaft and also through the rotor bearings, which are damaged by mechanical wear and also by the passage of current.

The discharge of electrical currents via the shaft into the housing is already known from the prior art. For this purpose, rod-shaped, electrically conductive components are often used, which extend from the shaft to the housing in order to ground the shaft.

For example, the document describes CN 104 037 985 an antistatic discharge device for the rotor of an electric motor. The antistatic discharge device comprises a discharge pin which is arranged in a bore at the rear end of a rotor spindle of the motor. The discharge pin is screwed to the housing of the electric motor for grounding and for electrical discharge of the rotor spindle.

Object of the invention

The invention is based on the object of conceiving an electric drive arrangement for a vehicle, which has an alternative, reliable and space-saving solution for shaft grounding and for diverting electrical currents in the shaft.

Description of the invention

This object is achieved by an electric drive arrangement for a vehicle having the features of claim 1. Preferred or advantageous embodiments of the invention emerge from the following description, the subclaims and / or the attached figures.

An electric drive arrangement for a vehicle is proposed. 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 assembly has an electric drive section. An electric drive, in particular an electric motor, which can also be referred to as an electric machine, is arranged in the electric drive section. The electric motor is preferably designed as an electric motor controlled by means of a frequency converter, in particular as an asynchronous electric motor. The electric motor can be designed as a wet-running electric motor or as a dry-running electric motor.

The electric drive has a rotor and optionally also a stator. The stator and the rotor are preferably arranged concentrically and / or coaxially with one another and / or with a main axis.

Furthermore, the electric drive section has a shaft, the shaft being connected to the rotor, e.g. by means of a gear mechanism. In particular, the shaft is driven via and / or by the rotor. The shaft defines the main axis.

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. Furthermore, it is provided in particular that the rotor shaft is electrically connected to the rotor. This leads to a potential difference there is the same potential difference between the rotor shaft and the surrounding structure between the rotor and a 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 gear unit in terms of transmission technology. In particular, the shaft forms an input shaft into the transmission device.

The electric drive arrangement comprises a housing with a housing section. The shaft is rotatably mounted relative to the housing. The housing preferably surrounds the electric drive section and the gear section at least partially, preferably largely or completely. In particular, the housing at least partially accommodates the electric drive and the transmission device. It is particularly preferred that the housing section faces away from the electric drive and / or faces the gear section.

The electrical drive arrangement comprises a discharge device, in particular for the electrical discharge of an electrical charge and / or voltage from the rotor via the shaft to the housing section. The diverting device comprises a first diverting device, which is designed in particular for electrical and mechanical connection to the shaft. The first diverting device is arranged in an interior of the shaft. The diverting device also comprises a second diverting device, which is designed in particular for electrical and mechanical connection to the housing section.

It is provided that the first diverting device has a contact surface for the second diverting device. The contact surface is arranged concentrically to the main axis. In particular, the second diverting device can contact the contact surface directly or indirectly in order to divert the electrical charge and / or voltage from the shaft into the housing.

In a preferred embodiment of the invention, the shaft comprises at least one hollow shaft section with a cavity which is surrounded by a shaft jacket. The shaft can, for example, be designed as a hollow shaft. Alternatively, the shaft can comprise at least one solid shaft section and the hollow shaft section or a plurality of hollow shaft and solid shaft sections.

The first diverting device is preferably designed as a disk with a disk end face and with a circumferential surface. In particular, the face of the pane is one of two faces of the pane, the face of the pane preferably being directed towards the housing section in an installation situation in the electric drive. It is particularly preferred that the disk is arranged concentrically to the main axis in the cavity of the hollow shaft section. In particular, the circumferential surface of the disk makes contact with the shaft jacket at least in sections, preferably completely. The disk is preferably arranged in a transition or press fit in the cavity, so that the circumferential surface of the disk makes full circumferential contact with the shaft jacket and / or rests against it. In this way, the electrical currents can be conducted from the shaft into the disk. It is also particularly preferred within the scope of the invention that the face of the pane has and / or forms the contact surface.

In a preferred embodiment of the invention, the solid shaft section has a solid shaft end face. The solid shaft end face preferably adjoins the cavity of the hollow shaft section. In particular, the full shaft end face in an installation situation is directed towards the gear section and / or facing away from the drive section. In particular, the solid shaft end face has and / or forms the contact surface.

In the context of the invention, it is preferably provided that the contact surface is formed by the disk end face of the disk arranged in the cavity of the shaft or by the solid shaft end face adjoining the hollow shaft section and / or includes the contact surface. It is advantageous that the contact surface can be placed at any point in the cavity of the shaft. It is particularly advantageous here to arrange the contact surface in the area of a gear-side bearing device, e.g. a roller bearing, in which the shaft is rotatably mounted.

In a possible structural implementation of the invention, the second discharge device is arranged in the cavity of the hollow shaft section. The second diverting device is preferably electrically and mechanically connected to the housing section.

It is advantageous that the first and second discharge devices are arranged in the cavity and therefore no additional installation space is required, e.g. on an outer diameter of the shaft or in an axial extension of the shaft.

For example, the second diverting device is designed as a rod with an electrically conductive property educated. In particular, the rod extends coaxially to the main axis. In particular, the rod is arranged in the cavity of the hollow shaft section or the hollow shaft. In particular, the rod for the electrical and mechanical connection of the contact surface and the housing section extends between the two. In particular, a first end of the rod protrudes into the cavity and a second end is connected to the housing section.

The rod can be made in one piece or in two pieces. As a two-part rod, it has an inner rod and a rod receptacle in which the inner rod is received at least in sections. The rod receptacle is designed, for example, as a circular cylinder with a cylinder space, the cylinder space being open on a side facing the housing section and being closed on a side facing the first discharge device. The inner rod preferably protrudes with a first end into the cylinder space and a second end protrudes therefrom in the direction of the housing section. In particular, the inner rod is fastened with the second end to the housing section.

A preferred embodiment of the invention provides that the diverting device comprises a current conducting element. The current conducting element is preferably designed to connect the first diverting device electrically and / or mechanically to the second diverting device. The current conducting element is preferably held by the second diverting device and / or fastened to it. In particular, the current conducting element extends from the second diverting device to the contact surface of the first diverting device. It is particularly preferred within the scope of the invention that the current conducting element is arranged centrally, in contact with the main axis, and / or coaxially with respect to the contact surface. Contacting the contact surface in its center is particularly advantageous because the circumferential speed there is very low, so that the electrical connection of the current conducting element in the center of the contact surface results in very little wear even with a non-rotating current conducting element.

It is possible within the scope of the invention that the current conducting element is arranged at the first end of the one-piece rod and protrudes therefrom in the axial direction with respect to the main axis. Alternatively, for the two-part rod, it is possible that the current conducting element is arranged at the second end of the rod receptacle and protrudes therefrom in the axial direction.

In a possible structural implementation of the invention, the current conducting element is pressed resiliently against the contact surface of the first diverting device. For example, the current conducting element is designed as a wire element, for example as a spring wire element. In particular, the spring wire element itself presses resiliently against the contact surface in order to electrically connect the second diverting device to the first diverting device.

Alternatively, the current conducting element can be designed as a sphere. In this case or in the event that the current conducting element is the wire element without its own resilient property, the second diverting device preferably comprises a spring device, in particular a compression spring, which presses the ball or the wire element against the contact surface. For this purpose, the ball or the wire element is preferably arranged between the spring device and the contact surface. In particular, the ball or the wire element is attached to the end of the spring device. It is particularly preferred that the spring device has an electrically conductive property in order to maintain the electrically conductive connection between the contact surface and the rod.

In a possible structural embodiment of the invention, the second diverting device, as the rod, has a receptacle for the spring device. In the event that the rod is designed in one piece, the receptacle is introduced into the rod at the first end centrally and / or coaxially to the main axis. Preferably, the spring device is largely or completely received in the receptacle, the ball or the wire element being arranged as the current conducting element, in particular outside the receptacle, so that it can be pressed against the contact surface.

Preferably, in the event that the rod is designed in two parts, the receptacle is integrated in the cylinder space of the rod receptacle designed as a circular cylinder and is fastened to the first end of the inner rod. In particular, the rod receptacle is resiliently arranged on the inner rod by means of the spring device. As a result, the current conducting element can be pressed resiliently against the contact surface by means of the rod receptacle.

In a further preferred embodiment of the invention, the first diverting device has a recess which is designed to partially accommodate and support the current conducting element, in particular in the form of the ball. The recess is preferably made centrally and coaxially to the main axis in the contact surface of the first diverting device. It can advantageously ensure reliable contact between the current conducting element and the contact surface. The first diverting device can alternatively or optionally additionally have openings through which Liquid, in particular oil, in the design of the electric drive as a wet-running motor, can flow through it.

A preferred implementation of the invention provides that the discharge device comprises a sealing and / or stripping device. The diverting and / or wiping device is preferably designed to seal the current-conducting element, in particular to seal off an intermediate space between the first current-conducting element and the second current-conducting element. In addition, the sealing and / or wiping device is optionally designed for wiping off the liquid and / or foreign particles, e.g. dirt particles, from the shaft jacket. As a result, the liquid and / or the foreign particles cannot impair or even interrupt the electrical discharge between the contact surface, the current-conducting element and the second discharge device. In particular, the discharge device can also be used without restrictions in the wet-running engine.

The sealing and / or stripping device preferably surrounds the current conducting element at least partially, preferably completely. The sealing and / or wiping device is preferably arranged between the second diverting device and the contact surface. In particular, the sealing and / or stripping device is attached to the end of the rod, in particular to the first end of the one-piece rod or the rod receptacle, and extends from there to the contact surface. The sealing and / or wiping device is preferably in contact with the contact surface. In the event that the first drainage device has the openings for the liquid to flow through, these are introduced into the first drainage device outside a contact area of the sealing and / or stripping device.

In a preferred embodiment of the invention, the second diverting device is mounted as the rod so as to be rotatable about the main axis, the mounting being arranged in particular on the housing section. For example, the rod, in particular the inner rod of the two-part rod, is rotatably mounted in a constant bearing which is arranged on the housing section. In particular, the inner rod can rotate in the cylinder space of the rod receptacle designed as a circular cylinder. It is possible within the scope of the invention for an electrically conductive lubricant to be arranged in the cylinder space to facilitate rotation of the circular cylinder and to maintain the electrical connection.

Figure list

• 1 eine schematische Darstellung einer elektrischen Antriebsanordnung mit einem Antriebsabschnitt und mit einem Getriebeabschnitt als ein Ausführungsbeispiel der Erfindung;
• 2 einen schematischen axialen Längsschnitt durch den Antriebsabschnitt, wobei die elektrische Antriebsanordnung eine Ableitvorrichtung umfasst;
• 3a-f die Ableitvorrichtung in unterschiedlichen Ausgestaltungen.

The invention is explained in more detail below in several preferred exemplary embodiments with reference to the accompanying drawings. Show:

• 1 a schematic representation of an electric drive arrangement with a drive section and with a gear section as an embodiment of the invention;
• 2 a schematic axial longitudinal section through the drive section, wherein the electric drive arrangement comprises a discharge device;
• 3a-f the discharge device in different configurations.

Detailed description of the drawings

Corresponding or identical components are provided with the same reference symbols in each of the figures.

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), as a motorcycle with an electric drive or as an e-scooter.

The electric drive assembly 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 drive section 2 on which an electric drive 3 for generating the traction torque and a rotor shaft 4th for the transmission of the traction torque. The electric drive 3 can be electrically connected to an energy device, for example a battery or a rechargeable battery, in order to obtain energy for generating the traction torque. The electric drive 3 can for example be designed as a direct current, synchronous or asynchronous motor.

The electric drive 3 has a stator 5 and a rotor 6th on. The rotor 6th is with the rotor shaft 4th non-rotatably connected. The rotor shaft 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. In particular, the electric drive 3 designed as an internal rotor.

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 drive 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 frictional 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 transmission. The electric drive section 2 and the gear section 7th are about the rotor shaft 4th Connected to each other in terms of transmission technology, the rotor 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 drive 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 drive 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 drive section 2 and the gear section 7th forms. The engine compartment can alternatively be designed as a wet room, in particular as a common space with the gear compartment. In particular, the electric drive 3 be designed as a wet-running electric drive.

The electric drive 3 or the electric drive arrangement 1 has a housing 11 on, with the stator 5 and the rotor 6th in the case 11 are arranged. The gear unit is an optional addition 8th or the gear section 7th also in the housing 11 arranged. The case 11 is on a side facing away from the transmission with a housing part 12th completed so that the housing part 12th a housing interior of the housing 11 limited. The case 11 comprises a housing section 15th ( 2 ), which is part of the separating section 10 forms.

For the rotatable mounting of the rotor shaft 4th has the electric drive assembly 1 a storage facility 13th and another storage facility 14th on, with the rotor shaft 4th about the storage facilities 13th , 14th is supported in the radial direction. The storage facilities 13th , 14th are each designed as a ball bearing, in particular as a deep groove ball bearing in the embodiment shown. Any of the storage facilities 13th , 14th has one with the rotor shaft 4th rotating inner ring 18th and a stationary outer ring 19th on.

The rotor shaft 4th has a rotor shaft section 17th on that to the gear section 7th is agile. The rotor shaft section 17th is the storage facility 13th stored. The storage facility 13th is in a receiving section 16 of the housing 11 recorded motion-proof.

The further storage facility 14th is in the housing section 12th added axially movably as a floating bearing. By the axial movement of the bearing device 13th can be a possible thermal expansion of the shaft 4th be balanced.

In a motor operation of the electric drive 3 Electric currents can be caused by potential differences caused by the rotor 6th , the rotor shaft 11 and the case 11 stream. When there is a flow, the electrical currents can lead to increased wear of the bearing equipment 13th , 14th or lead to their failure. To prevent this from happening, the electric drive assembly includes 1 a diverter 20th ( 2 , 3a-3f) to divert the electrical currents into the housing section 15th by earthing the rotor shaft 4th . Through the discharge device 20th can cost a repair of the electric drive assembly 1 and especially for the replacement of storage facilities 13th , 14th can be saved.

the 2 shows a schematic longitudinal section through the electric drive section 2 along the main axis H . In the electric drive section 2 is the discharge device 20th arranged.

The rotor shaft 4th has a hollow shaft section 21 on, which has a cavity 22nd and a wave jacket 23 includes. The hollow shaft section 21 is in the storage facility 13th and in the further storage facility 14th rotatably mounted. The hollow shaft section 21 extends from the drive section 2 the housing section 15th , which is part of the separating section 10 the drive section 2 from the gear section 7th ( 1 ) separates.

The discharge device 20th comprises a first diverting device 24 , a second discharge device 25th and a current conducting element 26th . The current conducting element 26th connects the first discharge device 24 and the second diverter 25th electrically with each other. The first diverter 24 , the second discharge device 25th and the current conducting element 26th are in that cavity 22nd of the hollow shaft section 21 arranged and thus arranged to save space.

The first diverter 25th is as one in the cavity 22nd concentric to the main axis H arranged disc 27 educated. It includes a disc face 28 and a peripheral surface 29 which around the main axis H runs. disc 27 is so in the cavity 22nd arranged that they are with the peripheral surface 29 on the wave jacket 23 is present. This allows the electrical currents of the hollow shaft section 21 through the pane 27 flow. The face of the disc 28 forms a contact surface 30th for the second discharge device 24 or for the current conducting element 26th .

The second discharge device 25th is as a coaxial with the major axis H arranged rod 31 , especially as a one-piece rod 34 , educated. The rod 31 extends with a first end ahead in the cavity 22nd towards the disc 27 and has a second end on the housing section 15th attached.

The current conducting element 26th is as a wire element 32 formed, which at the first end of the rod 31 is attached and attached to the contact surface 30th extends. The wire element 32 contacts the contact surface 30th at a center point, with the major axis H runs through the center. This has the advantage that the ring is locked 27 and the wire element 32 when the ring rotates 27 together with the hollow shaft section 21 can be kept low. The wire element 32 can be a spring wire element, which resiliently against the contact surface 30th pushes and thereby a secure contact between the ring 27 and the staff 31 manufactures. Thus, the electrical currents from the hollow shaft section 21 over the disc 27 on the wire element 32 and about this to the staff 31 flow, which the electrical currents in the housing section 15th initiates so that the hollow shaft section 21 and thus the rotor shaft 4th is grounded.

In the 3a until 3f are different embodiments and configurations of the discharge device 20th in schematic axial sectional views based on the main axis H shown.

According to the 3a is the first discharge device 25th than the disc 27 in the cavity 22nd concentric to the main axis H arranged and contacted with the peripheral surface 29 all around the shaft jacket 23 so that the electric currents from the hollow shaft section 21 in the disc 27 be initiated. The current conducting element 26th than the wire element 32 is on the second discharge device 25th than the stick 31 attached. It contacts the face of the disk 28 than the contact area 30th in its center and thus forms an electrically conductive connection to the rod 31 that as the one-piece rod 34 is trained. The rod 31 is for earthing the hollow shaft section 21 , especially the rotor shaft 4th , on the housing section 15th set.

The discharge device 20th comprises a sealing and / or wiping device 33 , which is essentially sleeve-shaped and is located between the rod 31 and the disc 27 extends. The wire element 32 is within the sealing and / or stripping device 33 arranged and completely surrounded by this. The sealing and / or stripping device 33 lies on the contact surface 30th ( 2 ) the disc 27 and at the first end of the rod 31 on and / or is connected to them. The sealing and / or stripping device 33 is provided for the purpose of liquid, e.g. oil, that is used in the operation of the electric drive 3 as a wet-running electric drive flows through this, and / or foreign particles, for example dirt particles, from the wire element 32 , the center of the contact area 30th and to the point of attachment of the wire element 32 on the stick 31 shield. This can impair or interrupt the electrically conductive connection within the discharge device 20th can be avoided and the discharge of electrical currents into the housing section 15th be guaranteed.

the 3d shows the structure of the discharge device 20th like him in the 3a is described. However, the staff is 31 not as a one-piece rod 34 formed, but as a two-part rod 35 educated. The two-part stick 35 includes an inner rod 36 and a rod holder 37 , which is designed as a circular cylinder. The wire element 32 and the sealing and / or wiping device 33 are at the first end of the rod holder 37 arranged and extend to the disc 27 . The wire element 32 contacts the contact surface 30th ( 2 ) the disc 27 in their center. The sealing and / or stripping device 33 lies on the contact surface 30th and on the rod holder 37 an surrounds the wire element 32 Completely.

The inside rod 36 is in sections, especially mostly in the rod holder 37 recorded. The inside rod 36 is with the housing section 15th rotatably connected. For rotatable mounting of the inner rod 36 on the housing wall 15th is a match camp 38 intended. In the space between the inner bar 36 and the rod holder 37 An electrically conductive lubricant is arranged to prevent the rotation of the inner rod 36 and to support the conductive connection between the inner rod 36 and the rod holder 37 to ensure.

the 3e shows the discharge device 20th , just like her in the 3d is described. The rod 3 is called the two-piece rod 35 educated. In the rod holder designed as a circular cylinder 37 is a spring device 38 , in particular a compression spring, arranged. The spring device 38 is designed to be electrically conductive. The spring device 38 is on the inner bar 36 , which is also in the rod holder 37 is recorded, fastened and supported on the rod holder 37 away. This is the rod receptacle 37 resiliently mounted and thus presses the wire element 32 against the contact surface 30th ( 2 ) the disc 27 . This allows the contact between the wire element 32 and the contact area 30th can be even better guaranteed.

the 3f has the same structure as the discharge device 20th like the one in the 3e shown discharge device 20th on. However, are in the disc 27 openings 39 introduced through which the liquid, in particular the oil, in the case of the wet-running electric drive 3 ( 1 ) can flow through. The openings 39 are arranged outside a contact area in which the sealing and / or stripping device 33 at the contact surface 30th is present. The liquid can thus be outside the sealing and / or wiping device 33 flow past and does not come into contact with the internal wire element 32 , the center of the contact area 30th and the point of attachment of the wire element 32 on the rod holder 37 .

According to the 3b comprises the discharge device 20th the disc 27 , whose face 28 the contact area 30th ( 2 ) forms as a one-piece rod 34 trained staff 31 , which at its second end to the housing section 15th is connected, and the sealing and / or stripping device 33 .

The current conducting element 26th is not as the wire element 32 formed, rather than a sphere 40 which is the contact area 30th contacted at their center. The ball 40 is on the spring device 38 resiliently mounted and is thus against the contact surface 30th pressed to make electrical contact between the ball 40 and the contact area 30th to ensure. The one-piece rod 34 assigns a recording 41 for the spring device 38 on, taking the inclusion 41 at the first end of the one-piece rod 34 is arranged. The sealing and / or stripping device 33 lies outside the recording 41 at the first end of the one-piece rod 34 so that the through the contact surface 30th , the ball 40 and the spring device 38 The electrical connection formed for the derivation of the electrical currents can be protected from impairment or interruption by the liquid and / or the foreign particles.

In the 3c has the rotor shaft 4th the hollow shaft section 21 and a full wave section 42 on. The full wave section 42 borders with a full shaft face 43 to the hollow shaft section 21 , especially the cavity 22nd , at. The one-piece rod 34 is with its second end on the housing section 15th attached and has the receptacle at its first end 41 on, in which the spring device 38 is recorded. The disc 27 is not to form the contact area 30th provide.

Rather, it forms the full shaft end face 43 the contact area 30th for the current conducting element 26th which as the ball 40 is trained. The ball 40 is from the sealing and / or stripping device 33 surround. This extends between the full shaft face 43 and the first end of the one-piece rod 34 .

In the full shaft face 43 which is the contact area 30th forms is a depression 44 brought in. The ball 40 is by the spring device 38 into the recess 44 partially pushed in and is thus in the recess 44 supported. This allows electrical contact between the contact surface 30th and the ball 40 be ensured. The sealing and / or wiping device is used for sealing and shielding 33 outside of the depression 44 at the contact surface 30th and outside of the recording 41 at the first end of the one-piece rod 34 at.

List of reference symbols

1

electric drive arrangement

2

electric drive section

3rd

electric drive

4th

Rotor shaft

5

stator

6th

rotor

7th

Gear section

8th

Transmission device

9

Output shaft

10

Separation section

11

casing

12th

Housing part

13th

Storage facility

14th

further storage facility

15th

Housing section

16

Receiving section

17th

further recording section

18th

rotating inner ring

19th

stationary outer ring

20th

Discharge device

21

Hollow shaft section

22nd

cavity

23

Wave jacket

24

first discharge device

25th

second discharge device

26th

Current conducting element

27

disc

28

Disc face

29

Circumferential surface

30th

Contact area

31

Rod

32

Wire element

33

Sealing and / or bracing device

34

one-piece rod

35

two-part rod

36

Inner bar

37

Rod holder

38

Spring device

39

openings

40

Bullet

41

recording

42

Full wave section

43

Full shaft face

44

deepening

H

Main axis

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

• CN 104037985 [0004]

Claims (10)

Electric drive arrangement (1) for a vehicle, with an electric drive section (2), the electric drive section (2) having an electric drive (3) with a rotor (6) and the electric drive section (2) having a shaft (4) comprises, wherein the shaft (4) is connected to the rotor (6) and wherein the shaft (4) defines a main axis (H), with a gear section (7), wherein in the gear section (7) a gear device (8) is arranged, wherein the shaft (4) with the transmission device (8) is technically connected, with a housing (11), wherein the shaft (4) is rotatably mounted relative to the housing (11), the housing (11) a Housing section (15), with a discharge device (20) for discharging an electrical charge and / or voltage from the rotor (2) via the shaft (4) to the housing section (15), the discharge device (20) having a first discharge device ( 24) for connection to the shaft (4) and comprises a second diverting device (25) for connection to the housing section (15), the first diverting device (24) being arranged in the interior of the shaft (4), characterized in that the first diverting device (24) has a contact surface (30) for the second diverting device (25), the contact surface (30) being arranged concentrically to the main axis (H). Electric drive arrangement (1) according to Claim 1 , characterized in that the shaft (4) comprises at least one hollow shaft section (21) with a cavity (22) surrounded by a shaft jacket (23), the first discharge device (24) being a disk (27) with a disk end face (28) and with a circumferential surface (29), wherein the disk (27) is arranged concentrically to the main axis (H) in the cavity (22), wherein the circumferential surface (29) contacts the shaft jacket (23) and / or wherein the disk end face (28 ) has and / or forms the contact surface (30). Electric drive arrangement (1) according to Claim 1 or 2 , characterized in that the shaft (4) comprises at least the hollow shaft section (21) and at least one solid shaft section (42), the solid shaft section (42) having a solid shaft end face (43), the solid shaft end face (43) adjoining the cavity (22) of the hollow shaft section (21), the solid shaft end face (43) having and / or forming the contact surface (30). Electric drive arrangement (1) according to one of the preceding claims, characterized in that the second diverting device (21) is arranged in the cavity (22) of the hollow shaft section (21), the second diverting device (21) being a rod (31) with electrically conductive Property is wherein the rod (31) extends coaxially to the main axis (H). Electric drive arrangement (1) according to one of the preceding claims, characterized in that the second diverting device (21) is electrically and mechanically connected to the housing section (15). Electric drive arrangement (1) according to one of the preceding claims, characterized in that the diverting device (15) comprises a current conducting element (26) for the electrical connection of the first diverting device (20) and the second diverting device (21), the current conducting element (26) from the second discharge device (21) is held and / or attached to this. Electric drive arrangement (1) according to one of the preceding claims, characterized in that the current conducting element (26) is resiliently pressed against the contact surface (30), the current conducting element (26) being a wire element (32) or a ball (40), wherein the wire element (32) presses against the contact surface (30) and / or wherein the second diverting device (20) comprises a spring device (38) for resiliently pressing the current conducting element (26) against the contact surface (30). Electric drive arrangement (1) according to one of the preceding claims, characterized in that the first diverting device (24) has openings (39) for the flow of liquid and / or that the first diverting device (24) has a recess (43) in the contact surface (30) ) for partially receiving and supporting the current conducting element (26). Electric drive arrangement (1) according to one of the preceding claims, characterized in that the discharge device (20) comprises a sealing and / or wiping device (33) against liquid and / or foreign matter, the sealing and / or wiping device (33) the Current conducting element (26) surrounds and / or wherein the sealing and / or wiping device (33) extends between the second discharge device (20) and the contact surface (30) and / or rests against the latter. Electric drive arrangement (1) according to one of the preceding claims, characterized in that the second diverting device (20) is mounted as the rod (31) so as to be rotatable about the main axis (H).

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