DE102011111632A1 - Electrical wheel drive arrangement for e.g. parallel-hybrid vehicle, has stator component whose peripheral surface is supported and rotatably mounted at axial shoulder of rim, where stator component is rotationally held by holder unit - Google Patents

Abstract

The arrangement (10) has an electric drive machine (40) arranged in an axial region of a wheel (12) of an outer runner motor. A rotor (42) of the drive machine is formed by a rim (18) or at an inner peripheral surface of the rim. A stator (50) of the drive machine is formed as an annular stator component (52) that is attached with a stator magnet assembly (54). An inner peripheral surface of the stator component is radially supported and rotatably mounted at an axial shoulder (56) of a wheel rim (16), where the stator component is rotationally held by a holder unit (60). An independent claim is also included for a supplementary part for a wheel assembly of a vehicle.

Description

The present invention relates to an electric Radantriebsanordnung according to the preamble of claim 1 and a retrofit kit for a wheel assembly of a vehicle according to the preamble of claim 8. Furthermore, the invention relates to the use of such a retrofit kit.

Such an electric wheel drive arrangement is for example from the DE 10 2010 049 608 A1 known. The known arrangement comprises a wheel and a wheel associated with the electric drive machine, which can be designed to drive the wheel, but preferably also operated as a generator. The wheel comprises a central hub, a radially adjacent to the wheel hub rim, and a ring-shaped closed on an outer circumference of the rim extending rim (it should be noted that in this publication, only the hub is explicitly mentioned and the existence of the rim and the rim implicitly results from the technical context). The electric drive machine is pivotally mounted on a chassis, wherein a drive shaft of the drive machine is coupled via a propeller shaft and an angle gear with the wheel.

The known electric wheel drive arrangement requires a special design of the wheel and / or provided on the vehicle for pivotal mounting of the wheel components.

It is an object of the present invention to provide a structurally simple electric wheel drive arrangement which is particularly well suited for retrofitting existing wheel assemblies.

According to a first aspect of the invention, this object is achieved in an electric wheel drive arrangement of the type mentioned above in that the electric drive machine is designed as an external rotor motor arranged within the axial extent of the wheel, that a rotor of the drive machine through the rim or one on an inner peripheral surface the stator fixed to the rotor magnet assembly is formed, and that a stator of the prime mover is formed as an annular Statorbaueinheit containing a stator magnet assembly, wherein an inner peripheral surface of the Statorbaueinheit is radially supported and rotatably mounted on an axial shoulder of the Radkranzes, wherein the Statorbaueinheit is held by a holding device rotationally stationary ,

In the wheel drive arrangement according to the invention, the electric drive machine is arranged to save space within the axial extent of the wheel and structurally simple. A particular advantage is that the integration of the prime mover does not require any special configuration of the wheel hub or of the neighboring vehicle-specific components. This advantage is based on the annularity of the stator stator assembly forming the stator. Advantageously used in many conventional wheel designs existing axial shoulder of the Radkranzes for storage of Statorbaueinheit. For this purpose, the inner peripheral surface of the Statorbaueinheit is radially supported on the axial shoulder of the Radkranzes and rotatably mounted. The pivot bearing of the Statorbaueinheit in conjunction with the holding device ensures that the Statorbaueinheit is held stationary in rotation even with rotating wheel rim.

In one embodiment, it is provided that the rotor comprises a permanent magnet arrangement, for example a multiplicity of permanent magnets arranged equidistantly over the circumference of the rim. In particular, each permanent magnet can generate a magnetic field directed in the radial direction, wherein z. B. an arrangement of the individual permanent magnets with alternating magnetic field orientation can be provided (in this case, an even number of permanent magnets must be provided).

As an alternative to permanent magnets, an arrangement of short-circuited magnetic coils or magnetic coils is also possible, in particular if the electric drive machine is designed as an asynchronous machine (in which the stator generates a magnetic rotating field). The term "magnet arrangement" as used herein is intended to designate, in addition to permanent magnets, such magnetic coils or solenoids, irrespective of whether an energization is provided for generating the magnetic field ("electromagnet") or the magnetic field is generated by induction, as described, for example, in US Pat. B. in the mentioned shorted turns or coils is the case. Under this definition falls z. B. also an embodiment of the rotor as a so-called squirrel cage, d. H. a plurality of circumferentially distributed plurality of axially extending electrically conductive rods which are annularly shorted at their ends, so that ultimately results in a plurality of distributed over the circumference arranged shorted turns.

Although it should not be ruled out that a correspondingly modified rim is used to form the rotor (eg with magnet windings or magnet coils arranged inside the rim), according to a preferred embodiment it is provided that the rotor engages one comprises the inside of the rim screwed and / or glued magnet assembly includes. In this magnet arrangement may in particular be the already mentioned permanent magnet arrangement, wherein z. B. an even number of permanent magnets with alternating magnetic field orientation distributed over the rim circumference.

In particular, with regard to a simple retrofitting, but also quite generally with regard to a simple installation, it is provided according to an embodiment that the rotor is designed as an annular structural unit, which z. B. comprises a substantially closed housing together with the accommodated therein magnet assembly. This unit can, for. B. for the screw connection with the rim suitable fasteners, z. B. extending in the radial direction screw holes.

In one embodiment, it is provided that the stator comprises an electromagnet arrangement, the z. B. may consist of a plurality of equidistantly distributed over the circumference arranged magnetic coils.

If the electric drive machine is designed as an asynchronous machine, so this z. B. three offset by 120 ° arranged electromagnets may be provided.

In particular, in an embodiment of the electric drive machine as a synchronous machine, the electromagnet arrangement of the stator preferably comprises more than three electromagnets, for example at least six or at least twelve electromagnets.

The stator-forming annular stator assembly including the stator magnet assembly may include a substantially closed housing together with the magnet assembly housed therein. In the preferred use of electromagnets here, a suitable passage through the housing for the electrical connection (wiring) of the solenoid assembly is provided. Preferably, such a passage (eg housing opening for the passage of an electric cable) extends out of the housing in the axial direction.

With regard to the radial support and the rotary mounting of the Statorbaueinheit on the axial shoulder of the Radkranzes, it is conceivable to provide a sliding bearing formed by the housing of Statorbaueinheit inner peripheral surface on the axial shoulder of the Radkranzes. The housing surface concerned and / or thus coming to rest area of the axial shoulder can this z. B. be coated or pretreated friction reducing, in particular, the use of a lubricant (eg., Fat) at the contact surface between Statorbaueinheit and Radkranz comes into consideration.

According to a preferred embodiment variant, however, it is provided that the wheel drive arrangement further comprises a roller bearing for effecting the rotary mounting of the stator assembly on the axial shoulder of the wheel rim. The rolling bearing z. B. as a ball bearing or cylindrical roller bearings, barrel roller bearings, etc., and in this case act primarily as a "radial bearing". An embodiment of the rolling bearing also for receiving axial forces is preferred insofar as in this case a thrust bearing to be arranged for this purpose is unnecessary (in order to reliably hold the stator assembly in its axial position).

If a roller bearing is provided for effecting the rotary mounting of the stator assembly, then this roller bearing can be structurally combined directly with the other components of the Statorbaueinheit, so to speak represent a part of this Statorbaueinheit.

It is understood that the rolling bearing can also be composed of several parts of adjacent individual bearings in the axial direction. It should also not be excluded that the pivot bearing is realized by the combination of a roller bearing with a sliding bearing (in which, for example, an inner ring of the roller bearing slides on the axial shoulder of the wheel rim and / or an outer ring of the roller bearing slides on the inner peripheral surface of the stator assembly ).

In one embodiment, it is provided that a ratio between the diameter of the axial shoulder of the rim and the diameter of the inner peripheral surface of the rim is in the range of 0.3 to 0.6.

In one embodiment, it is provided that the holding device comprises a holder connected on the one hand to the stator assembly and, on the other hand, to a vehicle-side component.

The holder can z. Example, be designed as a strut or a bracket whose ends are equipped with fastening means (eg., Bolt holes), so that the holder can be attached on the one hand to the Statorbaueinheit and on the other hand to the vehicle-mounted component.

As viewed radially, the stator assembly extends in an area between the wheel hub (or a central region of the rim) and the rim. In this area is particular arranged in conventional motor vehicles, a caliper of the respective wheel associated disc brake. In an embodiment which is advantageous in this respect, it is provided that the holder is designed for fastening on the vehicle side in the region of such a brake caliper. In a special development, a screw connection of the caliper with a vehicle-side component is used at the same time for fastening the holder.

The electric wheel drive arrangement according to the invention is particularly suitable for four-wheeled road vehicles, for example for designing these vehicles as electric vehicles or as hybrid vehicles, which are understood here to be vehicles that supply their drive energy from a combination of at least one internal combustion engine (eg gasoline engine or diesel engine) and at least one electric motor Refer to prime mover. For storage or intermediate storage of electrical energy, such vehicles have a "traction battery" on.

The electrical energy stored in the traction battery can be used to operate the electric drive machine (s). Charging the traction battery can be done by external charging stations (as it were "out of the socket") and / or by recuperation of electrical energy when braking the vehicle, d. H. by a generative operation of the electric drive machine (s) and recovery of the electrical energy thus obtained in the traction battery.

For the control of the electric drive machine used in the invention can be used advantageously on known concepts of the prior art. Such concepts, in particular containing details of the electrical control using inverters (inverters), including recuperation operation, are known in various designs, in particular from the field of electric vehicles and hybrid vehicles (including so-called "plug-in hybrids") and therefore require none here detailed explanation.

However, a particularly advantageous use of the invention results for vehicles that were originally manufactured only with an internal combustion engine drive, but in which the inventive electric Radantriebsanordnung was realized by a subsequent retrofitting.

• – einen Rotor, ausgebildet als eine an einer Innenumfangsfläche der Felge befestigbare Rotormagnetanordnung, und
• – einen Stator, ausgebildet als eine ringförmige Statorbaueinheit enthaltend eine Statormagnetanordnung, mit einer Innenumfangsfläche zur radialen Abstützung und Drehlagerung der Statorbaueinheit an der axialen Schulter des Radkranzes,

wobei der Rotor und der Stator im montierten Zustand eine als innerhalb des axialen Erstreckungsbereiches des Rades angeordneter Außenläufermotor ausgebildete, dem Rad zugeordnete elektrische Antriebsmaschine bilden.According to a further aspect of the present invention, therefore, a retrofit kit is provided for a wheel assembly of a vehicle, the wheel assembly comprising a wheel with a central hub, a radially adjacent to the wheel hub rim, and a ring-shaped closed running on an outer periphery of the rim rim , and wherein the wheel rim has an axial shoulder, characterized in that the retrofit kit comprises:

• A rotor formed as a rotor magnet assembly attachable to an inner peripheral surface of the rim, and
• A stator formed as an annular stator assembly comprising a stator magnet assembly having an inner circumferential surface for radially supporting and pivotally mounting the stator assembly to the axial shoulder of the rim,

wherein the rotor and the stator in the assembled state form an electric drive machine designed as an external rotor motor arranged within the axial extent of the wheel and associated with the wheel.

The special configurations and further developments already described above for the electric wheel drive arrangement can also be provided in an analogous manner for the retrofit kit according to the invention. In this regard, reference is made to the above description. For example, the retrofit kit may in particular also comprise a holding device which can be connected on the one hand to the stator assembly and, on the other hand, to a vehicle-mounted, stationary component for the stationary stationary holding of the mounted stationary component. In addition, the retrofit kit may also include electrical or electronic components, in particular at least one control device and an electrical cable assembly.

According to yet another aspect of the present invention, there is provided the use of a retrofit kit according to the invention for retrofitting a vehicle driven by an internal combustion engine (eg gasoline engine or diesel engine).

The invention will be further described by means of an embodiment with reference to the accompanying drawings. They show:

1 FIG. 2 is a schematic radial sectional view of an electric wheel drive arrangement according to an embodiment of the invention; FIG.

2 a schematic side view of the wheel drive assembly of 1 , and

3 a block diagram of an electric drive system of a vehicle, which is equipped with four electric Radantriebsanordnungen.

1 shows an electric wheel drive assembly 10 a vehicle, such as a car.

The wheel drive assembly 10 includes a wheel 12 with a central wheel hub 14 , one in the radial direction (outwards) to the wheel hub 14 adjoining wheel rim 16 and an annular closed on an outer circumference of the Radkranzes 16 extending rim 18 , Radially out of the axially extending rim 18 is an air filled tire 20 arranged, from which axially spaced sidewalls on axially spaced sealing strips (radial projections) of the rim 18 are sealed.

The wheel 12 is by means of wheel bolts 22 in the area of the wheel hub 14 to a spindle rotatably mounted about a rotation axis A. 24 screwed. The pivot bearing of the spindle 24 and thus the wheel 12 is through a pivot bearing 26 realized which the spindle 24 rotatable on a suspension part 28 a suspension of the vehicle stores.

One with the suspension part 28 connected approach 30 serves for the storage of a caliper 32 , for this purpose by means of a screw connection 34 at this approach 30 is attached. In the caliper 32 mounted brake pads act in a conventional manner on a brake disc 36 , which by means of a screw 38 rotationally fixed with the spindle 24 connected is.

The components of the electric wheel drive arrangement described so far 10 are of a conventional type. To form the illustrated electric wheel drive assembly 10 The conventional arrangement has been retrofitted with an electric drive machine described below 40 added.

The electric drive machine 40 is as one within the axial extent of the wheel 12 arranged external rotor motor formed and comprises a rotor 42 by one on an inner peripheral surface 44 the rim 18 glued on (alternatively: eg screwed on) arrangement of rotor magnets, here permanent magnets 46 , is trained.

A stator 50 the prime mover 40 is formed as an annular Statorbaueinheit. In the example shown, the stator assembly comprises a stator housing 52 and an array of stator magnets housed therein, referred to herein as energizable solenoids 54 are formed.

One of the stator housing 52 formed inner peripheral surface of the stator assembly 52 . 54 is on an axial shoulder 56 of the wheel rim 16 radially supported and by means of a pivot bearing, here rolling bearing 58 rotatably mounted.

The axial shoulder 56 of the wheel rim 16 is located in the illustrated example in the radial direction in a central region of the wheel 12 , A ratio between the diameter of the axial shoulder 56 and the diameter of the inner peripheral surface 44 the rim 18 is about 0.5.

The illustrated spatial arrangement of the rotor 42 and the stator 50 viewed in the axial direction within the extension of the wheel 12 and radially out of the range of the wheel hub 14 and the spindle 24 results in a particularly space-saving and compact design, which advantageously no special requirements for the construction of the radially inner or central region of the wheel 12 or the suspension components. The existing in many wheel designs already profiling the wheel cross-section, with at least one axial shoulder in the region of the rim, advantageously allows the retrofitting of a conventional wheel assembly to the illustrated electric Radantriebsanordnung 10 to obtain.

A stationary station holding the wheel rim 16 seated stator 50 requires next to here through the rolling bearing 58 realized rotational mobility of the stator 50 concerning the rim 16 a rotational fixation of the stator 50 with respect to the vehicle. This rotational fixation is in the example shown by a bow-shaped holder 60 accomplished, on the one hand with the Statorbaueinheit 52 . 54 and on the other hand connected to a vehicle-side non-rotating component. In the example shown, the holder 60 on the one hand by means of a screw connection 62 on an axial side wall of the stator housing 52 attached and on the other hand to the approach 30 attached to the disc brake system. For the latter attachment is advantageous in the example shown the same screw 34 used, by means of which also the caliper 32 at the beginning 30 screwed on. Deviating from the example shown, the rotational fixation of the stator 50 however, alternatively or additionally, by other non-rotatable couplings between the stator 50 and the suspension of the vehicle may be provided.

2 illustrates again in a schematic side view some of the components of the electric wheel drive arrangement already described 10 ,

From this view, it can be seen that in the present embodiment, the rotor 42 a total of 24 permanent magnets 46 comprises, in the circumferential direction equidistant, ie by 15 ° arranged offset from each other. These permanent magnets 46 generate in the example shown in the radial direction magnetic fields with alternating magnetic field orientation.

The stator 50 includes in the illustrated embodiment a total of 12 electromagnets 54 viewed in the circumferential direction equidistant, ie offset by 30 ° to each other in the stator housing 52 are arranged.

The simplicity of the representation of 2 In particular, the components of the suspension, including the disc brake system, and the holder are all parts 60 for rotational fixation of the stator 50 in 2 omitted.

The from the rotor 42 and the stator 50 formed electric drive machine 40 works in the example shown as a synchronous machine in which the wheel 12 by suitable energization of the stator magnets 54 can be driven by means of electrical energy from a traction battery. In addition, generator operation is also possible to the electric drive machine 40 also to brake the vehicle to operate under recuperation of electrical energy.

It is understood that both the concept of the prime mover exemplified here 40 as well as their control in practice can be modified in many ways, especially with regard to the type and number of magnets of the rotor 42 and the stator 50 ,

In the 1 and 2 For the sake of simplicity of illustration, it is also for energizing the stator magnet 54 required electrical wiring omitted. Such wiring can be done in a conventional manner, wherein z. B. a multi-core cable conveniently on an axially inner side wall of the stator housing 52 led out and connected to a corresponding control electronics (see also 3 ). In particular, the said cable in the area of the anyway provided holder 60 from the stator housing 52 led out (and on this holder 60 attached).

The training for the electric Radantriebsanordnung 10 used "retrofit kit" includes the rotor 42 from the individual permanent magnets 46 exists, but alternatively could also be provided as an annular unit with a housing, in which the permanent magnets 46 already arranged distributed in the circumferential direction. Furthermore, the retrofit kit includes the stator assembly 52 . 54 , possibly together with an already integrated rolling bearing 58 , as well as the holder 60 together with fixing screws 62 ,

With regard to the electrical control of the prime mover 40 In the example shown, the retrofit kit also includes electrical or electronic devices, to which reference will now be made with reference to FIGS 3 will be received.

3 shows a block diagram of the electric drive system of the retrofitted (four-wheeled) vehicle. The original drive system based on an internal combustion engine (eg gasoline engine) that is present in the vehicle is known from 3 not shown (but available). This conventional drive system can in a conventional manner z. B. be configured as a front-wheel drive or rear-wheel drive or four-wheel drive.

In 3 On two front wheels are electric wheel drive assemblies 10-1 . 10-2 and on two rear wheels, electric wheel drive assemblies 10-3 . 10-4 are provided, which are each formed substantially as described with respect to the 1 and 2 already described. Differences between the arrangements 10-1 . 10-2 and on the other hand the arrangements 10-3 . 10-4 arise in particular when the conventional drive system based on the internal combustion engine z. B. acts only on the front wheels or only on the rear wheels. In the 1 shown spindle 24 can accordingly be provided "free-running" or rotationally driven (as part of the conventional drive train).

Im in 3 All four conventional wheel assemblies have become electrified wheel drive assemblies 10-1 to 10-4 upgraded. Deviating from this, however, could also z. B. retrofitting may be provided only on the front wheels or only on the rear wheels.

The energization of the in the arrangements 10-1 to 10-4 included electric drive machines via multi-core electrical cable 70-1 to 70-4 , The number of cores in these cables depends on the specific design and operation of the electric drive machines. About the same cables 70-1 to 70-4 also the current generated in the regenerative operation of the drive machines is performed. The connection of the cables 70-1 to 70-4 via connector 72-1 to 72-4 , which are arranged in the vicinity of the respective wheel drive arrangement (eg in the region of in 1 shown holders 60 ). If necessary, the cables 70-1 to 70-4 Also contain additional lines for transmitting sensor signals, which of a rotation angle sensor in the region of the respective drive machine 40 To obtain information about the current rotational position of the wheels used for the synchronizers of the prime movers.

The control of the energization or the energy recovery during braking of the vehicle by means of control devices 74-1 to 74-4 to which the cables 70-1 to 70-4 are connected. Each of these controllers generally includes a controllable inverter to provide a bi-phase current from a traction battery 76 to convert into the required alternating current depending on the operating situation or a regenerative as alternating current via the cable 70-1 to 70-4 supplied power into a DC to recharge the traction battery 76 to change.

The electrical energy flow from the traction battery 76 to the control devices 74-1 to 74-4 or in the opposite direction (in regenerative operation of the prime mover) via two-core cable 78-1 to 78-4 ,

To control the overall system is a central electronic control unit in the example shown 80 provided, the z. B. contains a programmable microcontroller and a bus system with bus lines 82-1 to 82-4 with the decentralized (each one of the electric Radantriebsanordnungen 10-1 to 10-4 associated) control devices 74-1 to 74-4 connected is. About these bus lines 82-1 to 82-4 controls the central control unit 80 the switching operations required in the control devices for operating the electric drive devices 74-1 to 74-4 , both in drive mode and in regenerative mode.

The central control unit 80 is also via a bus line 84 (and a connector 86 ) with an existing in the vehicle anyway electronic bus 88 (eg CAN bus), so that also a communication of the control unit 80 with others on the bus 88 connected bus components can be done. Many conventional motor vehicles have an on-board diagnostics (OBD) interface. The connector 86 can optionally z. B. be connected to such an interface (socket). About this communication connection, the control unit 80 In particular, information regarding current operator requests such as "accelerate" and "brakes" are transmitted so that the control unit 80 taking into account these operator specifications based on a in the control unit 80 running software algorithm, the required control signals to the decentralized control devices 74-1 to 74-4 communicates, which in turn controls the flow of energy between the traction battery 76 and the individual electric wheel drive assemblies 10-1 to 10-4 Taxes.

The retrofit kit used in this example, in addition to the above-described wheel drive components in particular those in 3 illustrated electrical or electronic components including wiring (harness with connectors).

The connection of the electrical or electronic components of the retrofit kit to the vehicle is preferably carried out as described via a suitable communication interface or provided in or on the control device communication module, which communicates with an already in-vehicle control system (digital or analog). If retrofitting is to take place on a vehicle which has not been factory-equipped with a control system which is directly suitable for this retrofitting, retrofitting according to the invention can nevertheless take place by simultaneously also requiring the control, measuring and control devices necessary for operating the electric drive machine (s) / or control devices are also retrofitted.

In this context, it should again be noted that for the embodiment described in 3 illustrated control scheme is to be understood only as an example and can be modified in practice in many ways. In particular, the number and arrangement of control devices can also be selected differently than described in this example, in particular in adaptation to the retrofitted vehicle type and / or in adaptation to the "hybrid drive type" to be realized.

In summary, this provides a retrofit kit by means of which, in principle, arbitrary vehicles, in particular conventionally only road motor vehicles driven by an internal combustion engine, can be converted into an electric or hybrid vehicle. Depending on the activation of the relevant wheel drive arrangements, vehicles or operating modes can also be realized with purely electrical operation. In general, all special hybrid concepts can be realized within the scope of the invention, such. B. "parallel hybrid", "serial hybrid", "range extender", "plug-in hybrid" etc. Advantageously, retrofitting existing vehicles can be done in which only a few modifications to existing parts or existing vehicle structures must be made. The retrofitting can usually be done within a few hours and thus with relatively little effort.

It is also conceivable use as a "tuning concept" to increase the drive power by adding the electric drive. Also, by retrofitting to the otherwise non-driven wheels z. B. from a front only or rear-wheel drive vehicle to be made a four-wheel drive vehicle.

With regard to various performance requirements and / or geometric dimensions, suitably adapted retrofit sets (for different vehicle types or different wheel arrangement geometries) can be provided.

The retrofit kit can be offered in different equipment variants, the z. B. in particular in the software (for the central control unit) and the capacity of the traction battery can distinguish.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102010049608 A1 [0002]

Claims (10)

Electric wheel drive arrangement for a vehicle, comprising - a wheel ( 12 ) with a central hub ( 14 ), in a radial direction to the wheel hub ( 14 ) subsequent wheel rim ( 16 ), and an annular closed on an outer circumference of the Radkranzes ( 16 ) running rim ( 18 ), and - a wheel ( 12 ) associated electric drive machine ( 40 ), characterized in that the electric drive machine ( 40 ) as one within the axial extent of the wheel ( 12 ) arranged external rotor motor is formed such that a rotor ( 42 ) of the prime mover ( 40 ) through the rim ( 18 ) or one on an inner peripheral surface of the rim ( 18 ) fixed rotor magnet arrangement ( 46 ) is formed, and that a stator ( 50 ) of the prime mover ( 40 ) as an annular stator assembly ( 52 . 54 ) comprising a stator magnet arrangement ( 54 ), wherein an inner circumferential surface of the stator assembly ( 52 . 54 ) on an axial shoulder ( 56 ) of the wheel rim ( 16 ) is radially supported and rotatably mounted, wherein the Statorbaueinheit ( 52 . 54 ) but by means of a holding device ( 60 . 62 . 34 ) is kept stationary. Electric wheel drive arrangement according to claim 1, wherein the rotor ( 42 ) a permanent magnet arrangement ( 46 ). Electric wheel drive arrangement according to one of the preceding claims, wherein the rotor ( 42 ) one on the inside of the rim ( 18 ) screwed and / or glued magnet assembly ( 46 ). Electric wheel drive arrangement according to one of the preceding claims, wherein the stator ( 50 ) an electromagnet arrangement ( 54 ). Electric wheel drive arrangement according to one of the preceding claims, wherein the holding device ( 60 . 62 . 34 ) one on the one hand with the Statorbaueinheit ( 52 . 54 ) and on the other hand connectable with a vehicle-mounted rotating stationary component holder ( 60 ). Electric wheel drive arrangement according to one of the preceding claims, wherein a ratio between the diameter of the axial shoulder ( 56 ) of the wheel rim ( 16 ) and the diameter of the inner peripheral surface of the rim ( 44 ) is in the range of 0.3 to 0.6. Electric wheel drive arrangement according to one of the preceding claims, wherein the holding device ( 60 . 62 . 34 ) one on the one hand with the Statorbaueinheit ( 52 ) and on the other hand connected to a vehicle-side component holder ( 60 ). Retrofit kit for a wheel assembly of a vehicle, wherein the wheel assembly is a wheel ( 12 ) with a central hub ( 14 ), in the radial direction to the wheel hub ( 14 ) subsequent wheel rim ( 16 ), and an annular closed on an outer circumference of the Radkranzes ( 16 ) running rim ( 18 ), and wherein the wheel rim has an axial shoulder ( 56 ), characterized in that the retrofit kit comprises: - a rotor ( 42 ) formed as one on an inner peripheral surface of the rim ( 18 ) mountable rotor magnet assembly ( 46 ), and - a stator ( 50 ) formed as an annular stator assembly ( 52 . 54 ) comprising a stator magnet arrangement ( 54 ) with an inner circumferential surface for the radial support and rotational mounting of the stator assembly ( 52 . 54 ) at the axial shoulder ( 56 ) of the wheel rim ( 16 ), wherein the rotor ( 42 ) and the stator ( 50 ) in the assembled state, as within the axial extent of the wheel ( 12 ) arranged external rotor motor formed the wheel ( 12 ) associated electric drive machine ( 40 ) form. Retrofit kit according to claim 8, further comprising on the one hand with the Statorbaueinheit ( 52 . 54 ) and on the other hand with a vehicle-mounted rotating stationary component ( 30 ) connectable holding device ( 60 ) for a rotational stationary holding the mounted stator assembly ( 52 . 54 ). Use of a retrofit kit according to claim 8 or 9 for retrofitting a vehicle driven by an internal combustion engine.

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