DE102020106337A1 - Bearing arrangement for integration in an electric drive arrangement for a vehicle and an electric drive arrangement with the bearing arrangement - Google Patents

Abstract

A solution is to be provided for insulating a bearing device 13 of a bearing arrangement 20 for an electric drive arrangement 1 against the passage of current. The bearing arrangement 20 is designed for integration into an electric drive arrangement 1 for a vehicle, which comprises an electric drive section 2 and a transmission section 7. The bearing arrangement 20 has a bearing device 13 and an insulation layer 21 for electrical insulation of the bearing device 13, the insulation layer 21 being designed as an adhesive layer 22.

Description

Field of invention

The invention relates to a bearing arrangement for integration into an electric drive arrangement for a vehicle. The bearing arrangement comprises a bearing device with an insulation layer for electrical insulation of the bearing device. The invention further relates to an electric drive arrangement with the bearing arrangement.

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 also flow through the rotor bearings, which are damaged by mechanical wear and tear and also by the passage of current.

The insulation of rotor bearings, which are integrated into the electrical drive for supporting a rotor shaft, are already known from the prior art. Such insulation can be attached to an outer circumferential surface of an outer ring of the rotor bearing and provided to insulate the rotor bearing from the electrical currents in order to protect it from increased wear due to the passage of current.

For example, the document describes DE 10 2009 056 349 A1 a rolling bearing with an outer ring and an inner ring and several rolling elements. For thermal insulation and electrical insulation, a plastic section made from a plastic film without cutting is attached at least partially to an outer circumference of the outer ring.

Object of the invention

The invention is based on the object of providing an alternative and functionally expanded solution for insulating a bearing device of a bearing arrangement for an electric drive arrangement against the passage of current.

Description of the invention

This object is achieved by a bearing arrangement for integration into an electric drive arrangement for a vehicle with the features of claim 1 and by an electric drive arrangement with the bearing arrangement according to claim 7. Preferred or advantageous embodiments of the invention emerge from the following description, the subclaims and / or the attached figures.

A bearing arrangement is proposed which is designed for integration into an electric drive arrangement for a vehicle. The bearing arrangement has a bearing device. The bearing device is preferably designed as a roller bearing. The roller bearing comprises in particular an outer ring, a plurality of roller bodies and an inner ring, the roller bodies being rotatably received between the outer ring and the inner ring. For example, the roller bearing can be designed as a ball bearing or as a roller bearing. The roller bearing is made in particular of steel.

The bearing arrangement comprises an insulation layer. The insulation layer is designed to electrically insulate the bearing device. For example, the insulation layer is designed to insulate the bearing device from electrical currents that flow in the electrical drive arrangement.

It is provided that the insulation layer is designed as an adhesive layer. The insulation layer, as the adhesive layer, in particular in the adhesive of the adhesive layer, preferably has electrically insulating properties and adhesive properties. Thus, the insulating layer as the adhesive layer can have and implement a multiple function on the storage device.

In a preferred embodiment of the invention, the adhesive layer is arranged on the inner ring of the bearing device. The adhesive layer is preferably arranged on an inner circumference of the inner ring. Alternatively, the adhesive layer can be arranged on the outer ring of the bearing device. In particular, the adhesive layer is arranged on an outer circumference of the outer ring.

It is particularly preferred within the scope of the invention that the bearing arrangement comprises an additional ring. The additional ring is preferably arranged on the inner ring. In particular, the additional ring is arranged on the inner circumference of the inner ring. Alternatively, the additional ring can be arranged on the outer ring. The additional ring is preferably arranged on the outer circumference of the outer ring.

In a possible structural implementation of the invention, the additional ring is glued to the inner ring, in particular to the inner circumference of the inner ring, by means of the adhesive layer. Alternatively, the additional ring is glued to the outer ring, in particular to the outer circumference of the outer ring, by means of the adhesive layer. In particular, the additional ring can be drawn, pressed, wound, pushed on or placed on this in order to be glued to the inner ring or to the outer ring.

Within the scope of the invention it is also possible that two additional rings are provided, one being glued to the inner ring by means of the adhesive layer and the other being glued to the outer ring by means of the adhesive layer.

For example, the adhesive of the adhesive layer comprises an epoxy resin, preferably with incorporated ceramic components. The adhesive is preferably a two-component adhesive made from epoxy resin. The additional ring is formed in particular from a material different from the adhesive. The additional ring preferably has a higher modulus of elasticity than the adhesive. For example, the additional ring is made of a stiff material, in particular steel, so that it can offer maximum strength. Alternatively, the additional ring can be made of aluminum. Optionally, the additional ring can also be made from a plastic material.

In a possible structural implementation, the additional ring can be designed as a completely closed ring or as a ring that is divided one or more times. For example, the additional ring is designed as a circular cylinder. Alternatively, depending on the surrounding construction, the additional ring can be designed as an angular ring or have other geometries. Furthermore, it is possible within the scope of the invention that the additional ring has at least one opening in the radial direction with respect to a shaft of the electric drive arrangement. Alternatively or optionally in addition, the additional ring can have at least one notch, which extends, for example, transversely to an axial direction related to the shaft. For gluing the additional ring, the adhesive layer can be applied to the inner ring or the outer ring in a corresponding manner, e.g. interrupted once or several times.

In one possible implementation of the invention, the bearing arrangement comprises a sensor device. The sensor device is arranged in particular on the additional ring. The sensor device is preferably designed to record bearing-specific data such as a torque, a temperature or the like.

An electric drive arrangement for a vehicle forms a further subject of the invention. 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 as the electric motor preferably defines a main axis. 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 the 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 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 has the result that if there is a potential difference between the rotor and a surrounding structure, the same potential difference is present between the rotor 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 gear unit in terms of transmission technology. In particular, the shaft forms an input shaft into the transmission device.

The shaft has a shaft section. The shaft section is preferably arranged on the transmission side. In particular, the shaft section faces away from the drive section.

The electric drive arrangement comprises a housing which at least partially, preferably largely or completely, surrounds the electric drive section and the gear section. In particular, the housing at least partially accommodates the electric drive and the transmission device. The shaft section of the shaft is rotatably mounted relative to the housing.

It is provided that the electric drive arrangement comprises the bearing arrangement according to the previous description and / or according to one of claims 1 to 8.

In a preferred implementation of the invention, the shaft section of the shaft is rotatably mounted relative to the housing in the bearing device of the bearing arrangement. The inner ring is preferably seated on the shaft section. In particular, the inner ring is non-rotatably connected to the shaft section, so that it rotates with the shaft section.

It is advantageous in this case if the additional ring is glued to the inner circumference of the inner ring by means of the adhesive layer. Because there the additional ring can ensure a secure and firm seat of the bearing device, in particular the inner ring, on the shaft section.

A possible structural embodiment of the invention provides that the housing has a receiving area for the bearing arrangement. The receiving area can be integrated in the housing, in particular it can be formed in the housing in the shape of a cylinder or a socket. However, depending on the application, it can also have other geometries and / or contours. It is preferred that an outer contour of the additional ring, when it is glued to the outer circumference of the outer ring of the bearing device, is adapted to the geometries and / or contours of the receiving section.

The additional ring glued to the outer circumference of the outer ring by means of the adhesive layer advantageously ensures that the bearing device is seated securely and firmly in the receiving area of the housing. For example, the bearing device, in particular the outer ring, is fastened in the receiving area in a non-positive and / or frictional manner and is thus arranged in the receiving area in a rotationally fixed manner.

The bearing device can advantageously be isolated from the electrical currents in the electrical drive arrangement by means of the insulation layer as the adhesive layer. For example, electrical currents can be interrupted between the shaft section and the housing, along the shaft and / or between an electrical drive device of the electrical drive arrangement, the shaft and / or the housing, since the bearing device cannot form an electrical connection due to the insulation through the insulation layer . In this way, the bearing device can be protected from increased wear and the resulting functional failure, so that an extension of the service life of the bearing device can be achieved in an advantageous manner.

Figure list

• 1 eine schematische Darstellung einer elektrischen Antriebsanordnung als ein Ausführungsbeispiel der Erfindung;
• 2 einen schematischen axialen Längsschnitt durch eine Lageranordnung der elektrischen Antriebsanordnung.

A preferred embodiment of the invention is explained in more detail below with reference to the accompanying drawings. Show:

• 1 a schematic representation of an electric drive arrangement as an embodiment of the invention;
• 2 a schematic axial longitudinal section through a bearing arrangement of the electric drive arrangement.

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 , being 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 section 12th completed so that the housing section 12th a housing interior of the housing 11 limited. 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 15th on that to the gear section 7th is agile. The rotor shaft section 15th 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 a further receiving section 17th recorded, which in the housing section 12th is arranged. The housing section 12th is about the further storage facility 14th closed. The further storage facility 14th is designed as a floating bearing, which in the further receiving section 17th in relation to the main axis H and relative to the housing section 12th is axially movable. 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 discharge currents and / or potential differences can be caused, which spread over the storage facilities 13th , 14th unload and the storage facilities 13th , 14th can damage. That is why the storage facilities 13th , 14th against electrical currents in the housing 11 , in the housing section 12th and / or in the rotor shaft 4th isolated. By isolating the storage facilities 13th , 14th the electrical currents can be interrupted. By preventing the flow of electricity through the storage facilities 13th , 14th these can be protected from increased wear and failures avoided. This can result in costs for repairing the electric drive arrangement 1 and especially for the replacement of storage facilities 13th , 14th can be saved.

To isolate the storage facility 13th is an insulation layer 21 intended. This forms together with the storage facility 13th part of a bearing arrangement 20th the electric drive assembly 1 .

The bearing arrangement 20th is in the 2 shown in an axial sectional view. The bearing arrangement 20th is in the receiving section 16 of the housing 11 ( 1 ) recorded.

The insulation layer 21 is as an adhesive layer 22nd educated. The adhesive layer 22nd is formed from an adhesive comprising an epoxy resin and ceramic parts. The adhesive can, for example, as a two-component adhesive made of epoxy resin. In addition to adhesive properties, the adhesive also has an electrically insulating property.

The bearing arrangement 20th has an additional ring 23 on, which is cylindrical. The additional ring is according to the embodiment of 2 designed as a completely closed ring. The additional ring 23 is on the outer ring 19th , in particular on an outer circumference of the outer ring 19th arranged. The additional ring 23 is by means of the adhesive layer 22nd with the outer ring 19th glued. The adhesive layer was used for this 22nd first on the outer circumference of the outer ring 19th or on an inner circumference of the additional ring 23 upset. The additional ring 23 was pulled, pushed, pressed or wound onto the outer ring to glue it.

The additional ring 23 is made of steel, which gives it high strength. Alternatively, it can be made of aluminum or a plastic. Thus is the additional ring 23 from one of the adhesive of the adhesive layer 22nd different material is formed. It has a higher modulus of elasticity than the adhesive.

The bearing arrangement 13th is in the receiving section 16 non-positively and / or frictionally and thus non-rotatably arranged. Because the additional ring 23 on the outer circumference of the outer ring 19th is arranged, this can ensure a secure and tight fit of the bearing arrangement 13th in the receiving section 16 guarantee. The insulation layer 21 is through the additional ring arranged on it 23 from abrasion, e.g. B. when pressing in the bearing device 13th in the receiving section 16 protected.

The bearing arrangement 20th also includes a sensor device (not shown) for recording storage-specific data, for example one in the storage facility 13th prevailing temperature or a speed of the inner ring 18th . The sensor device is on the additional ring 23 arranged.

In an alternative embodiment, the additional ring 23 can also be designed as an angle ring or with a different contour, so that it is in a correspondingly shaped receiving section 16 in the case 11 can be included. The additional ring 23 can also be subdivided one or more times and / or have at least one opening and / or notch.

In the alternative embodiment, the additional ring 23 by means of the adhesive layer 22nd also on the inner ring 18th , in particular on an inner circumference of the inner ring 18th , be glued on. This has in addition to the insulating effect of the insulation layer 21 than the adhesive layer 22nd also the advantage that the one with the rotor shaft section 15th rotating inner ring 18th by the additional ring 24 securely and firmly on the rotor shaft section 15th sits and that the insulation layer 21 is protected.

List of reference symbols

1

electric drive arrangement

2

electric drive section

3

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 section

13th

Storage facility

14th

further storage facility

15th

Rotor shaft section

16

Receiving section

17th

further recording section

18th

rotating inner ring

19th

stationary outer ring

20th

Bearing arrangement

21

Insulation layer

22nd

Adhesive layer

23

Additional ring

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

• DE 102009056349 A1 [0004]

Claims (10)

Bearing arrangement (20) for integration in an electric drive arrangement (1) for a vehicle, with a bearing device (13), the bearing device (13) having an insulation layer (21) for the electrical insulation of the bearing device (13), characterized in that the The insulation layer (21) is an adhesive layer (22). Bearing arrangement (20) according to Claim 1 , characterized in that the bearing device has an inner ring (18) and an outer ring (19), the adhesive layer (22) being arranged on the inner ring (18) and / or on the outer ring (19). Bearing arrangement (20) according to Claim 1 or 2 , characterized in that the bearing arrangement (20) comprises an additional ring (23), the additional ring (23) being arranged on the outer ring (19) or on the inner ring (18). Bearing arrangement (20) according to Claim 3 , characterized in that the additional ring (23) is glued to the outer ring (19) or to the inner ring (18) by means of the adhesive layer (22). Bearing arrangement (20) according to one of the preceding claims, characterized in that an adhesive of the adhesive layer (22) comprises an epoxy resin. Bearing arrangement (20) according to one of the Claims 3 until 5 , characterized in that the additional ring (23) is formed from a material different from the adhesive of the adhesive layer (22) and / or has a higher modulus of elasticity than the adhesive of the adhesive layer (22). Bearing arrangement (20) according to one of the Claims 3 until 6th , characterized in that the additional ring (23) is designed as a completely closed ring or as a single or multiple subdivided ring, that the additional ring (23) is designed as a circular cylinder or as an angular ring and / or that the additional ring (23) at least has an opening and / or notch. Bearing arrangement (20) according to one of the Claims 3 until 7th , characterized in that the bearing arrangement (20) comprises a sensor device, the sensor device being arranged on the additional ring (23). 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) wherein the shaft (4) is connected to the rotor (6) and wherein the shaft (4) has a shaft section (15) with a gear section (7), a gear device (8) being arranged in the gear section (7) is, the shaft (4) being connected to the transmission device (8) in terms of transmission technology, with a housing (11), the shaft section (15) being rotatably mounted relative to the housing (11), characterized in that the electric drive arrangement ( 1) comprises a bearing arrangement (20) according to one of the preceding claims. Electric drive arrangement (1) according to Claim 9 , characterized in that the shaft section (15) is rotatably mounted relative to the housing (11) in the bearing device (13) of the bearing arrangement (20).

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