Electric drive device for a vehicle, and method for producing an electric drive device for a vehicle
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- ROBERT BOSCH GMBH
- Filing Date
- 2024-07-26
- Publication Date
- 2026-07-08
Smart Images
Figure EP2024071235_06032025_PF_FP_ABST
Abstract
Description
[0001] Description
[0002] title
[0003] Electric for a vehicle and method for producing an electrical for a
[0004] The present invention relates to an electric drive device for a vehicle and a method for producing an electric drive device for a vehicle.
[0005] State of the art
[0006] In the case of electric axles for vehicles, for example in passenger cars or light commercial vehicle applications, these can usually be designed as a fully integrated unit consisting of an electric motor, power electronics and a transmission.
[0007] A rotor shaft of the electric machine can usually be connected to the transmission input shaft in a form-fitting manner (e.g. via a spline) and a corresponding power transmission can be achieved.
[0008] An associated bearing system of a fast-rotating shaft assembly in electric drive axles for electric and hybrid vehicles can consist of two, three or four bearings, which can be distributed between the electric motor and the transmission.
[0009] There may be three bearings, especially two bearings in the gearbox, one
[0010] Bearings in the machine (B-bearings) and connections of the shafts to the
[0011] Torque transmission (e.g. spline), whereby centering of the shafts via the spline or additional centering surface can be possible; or alternatively can be realized with a through shaft, or one bearing in the gearbox and two bearings in the machine (A & B bearings) and a connection of the shafts for torque transmission (e.g. spline) and centering of the shafts via the spline or additional centering surface, whereby in addition the radial force from the running gear can be transmitted from the gearbox shaft to the EM shaft, which can also be realized alternatively with a through shaft.
[0012] In common electric axles, a shaft arrangement may be present, whereby a rotor shaft can be coupled to a transmission input shaft in order to transmit torque, whereby the shaft arrangement can be mounted with 3 or 4 rolling bearings, in particular adjusted, preloaded or via a fixed-loose bearing or by mixtures thereof.
[0013] DE 10 2020 210 110 A1 describes a drive unit for a vehicle, which comprises an electric machine with a rotor shaft and a transmission with a transmission shaft, wherein the transmission shaft is rotatably mounted in a first housing section by means of a first rolling bearing and the rotor shaft is rotatably mounted in a second housing section by means of a second rolling bearing.
[0014] Disclosure of the invention
[0015] The present invention provides an electric drive device for a vehicle according to claim 1 and a method for manufacturing an electric drive device for a vehicle according to claim 11.
[0016] Preferred further training is the subject of the subclaims.
[0017] Advantages of the invention
[0018] The idea underlying the present invention is to improve the connection between a rotor shaft and a transmission input shaft. This advantageously creates the most cost-effective connection possible between the rotor shaft and the transmission input shaft. This connection can advantageously be designed in such a way that a common centering of the housing and the shafts relative to each other can be achieved. Advantageously, axial locking of the two components can also be achieved to reduce the likelihood of axial displacement of the components during operation or even prevent it.
[0019] According to the invention, the electric drive device for a vehicle comprises a rotor with a rotor shaft; a transmission with a transmission input shaft, wherein the rotor shaft comprises a first spline in a first region and the transmission input shaft comprises a second spline in a second region, and the first region can be connected by means of the first spline to the second region by means of the second spline, wherein the first spline is located on a radial outer side of the first region and the transmission input shaft is a hollow shaft and the second spline is formed on an inner wall of the transmission input shaft in the second region;and a connecting element which can be connected to the first region or to the second region and wherein the connecting element can be placed in a cavity of the hollow shaft on an inner seat of the inner wall of the transmission input shaft or on a support region on the rotor shaft, whereby the transmission input shaft and the rotor shaft can be fixed axially to one another.;
[0020] According to a preferred embodiment of the electric drive device, the connecting element can be connected to the first region or to the second region by means of an adhesive connection, or the connecting element is a pressing element and can be connected to the first region or to the second region in a press-fit manner.
[0021] The first and second regions in which the spline can be formed can relate to one end of the associated shaft, or to a region spaced from the end of the associated shaft, or to a central region of the associated shaft. The approach according to which the connecting element can be placed in a cavity of the hollow shaft on an inner seat of the inner wall of the transmission input shaft, whereby the transmission input shaft and the rotor shaft can be axially fixed to one another, can be fulfilled in such a way that the head region rests directly on the inner seat or indirectly with another element in between, such as a spring. In the latter case, a radius of an outer contour of the head region can also be smaller than the inner radius of the inner seat.
[0022] The invention can prevent or at least reduce axial movement of the rotor (the rotor shaft) in an electric axle with splined gearing and a three-bearing design. This can improve NVH behavior. Furthermore, the influence of individual component tolerances on the rotor's axial play at higher speeds can be reduced.
[0023] For the shafts, a three-bearing concept can be implemented with the rotor shaft and the gearbox input shaft, whereby the two shafts can be connected by means of the splines and the glued or pressed connecting element.
[0024] The inner seat of the inner wall can be a radial projection extending radially inward from the inner wall of the gear shaft, either at a predetermined axial location as a shoulder or collar, or it can be the edge of the second spline, in particular the edge that faces the central region of the cavity and faces away from the rotor shaft. The connecting element can then have an outer radius that is larger than the inner radius of the inner seat, allowing the connecting element to be axially placed and axially supported on the inner seat.
[0025] According to conventional designs, axial movement of the rotor (the rotor shaft) is possible. Thus, the rotor shaft can slip out of the transmission input shaft under shock loads in the Y direction (parallel to the axial direction), or the probability of this is at least increased. In such conventional designs, a tension spring can be overcompressed, resulting in a collision between rotating and stationary parts.
[0026] By interlocking the two splines, torque can be transmitted between the shafts.
[0027] According to a preferred embodiment of the electric drive device, the connecting element is a ring which can be placed and glued or pressed onto an adhesive or pressing area on the second area or onto a projection area on the first area, or the connecting element is a pin with a head area, wherein the pin can be pressed into a recess in the first area of the rotor shaft and the ring or the head area can be placed in the cavity of the hollow shaft on the inner seat of the inner wall of the transmission input shaft.
[0028] In addition to such a pressed bolt, all other forms of pressing are also possible, for example the pressed ring.
[0029] The projection area can extend axially beyond the first spline towards the cavity and, for example, have a smaller radius than the first spline. The ring can have an inner diameter which can be slightly smaller than the radius of the projection area and can be pressed onto the projection area with a certain amount of force. The outer diameter of the ring can sit axially on the inner seat or a shoulder or collar on the transmission input shaft. Alternatively, the ring can also be pressed into a pressing area on the inner wall of the second area and lean against a projection or shoulder or collar on the rotor shaft (on the first area), for example on the edge of the first spline, and support the shafts axially relative to one another.
[0030] According to a preferred embodiment of the electric drive device, the ring or the pin can be pressed onto the first region or into the recess in such a way that the ring or the pin remains immovably attached to the rotor shaft or transmission input shaft against a predetermined holding force.
[0031] The ring or pin, which can also be designed as a plug, can be pressed into the recess in the rotor shaft, advantageously as an interference fit, whereby an axial holding force of, for example, 3 kN - ~10 kN can be achieved. In the context of this invention, the axial direction can correspond to a direction along the symmetry and rotational axes of the rotor shaft / gearbox shaft. The recess for the pin can run symmetrically around the symmetry and rotational axes of the rotor shaft and centrally along these. The pressed-in connecting element, which is leaning against the inner seat or corresponding form fit (shoulder / collar), can reduce or prevent axial movement of the rotor in the aforementioned bearing concept and can improve the robustness and NVH behavior of an electric axle.
[0032] In order to achieve the structure of the invention, existing assembly concepts advantageously only need to be slightly adapted in order to achieve and implement the joining process according to the invention.
[0033] According to a preferred embodiment of the electric drive device, the ring or the head region deviates in a plan view along an axis of symmetry of the transmission input shaft in regions radially inward from a predetermined inner radius of the inner seat, so that an oil can be conducted through the hollow shaft and past the head region or ring to the first spline and / or second spline.
[0034] According to the invention, the first and / or second spline can thus be supplied with the gear oil, in particular wetted, in order to prevent or at least reduce dry running of the spline and thus reduce wear.
[0035] A suitably selected contour on the outer diameter of the head area (e.g., a knurling or a flower contour) can further ensure oil supply to the spline. The electric drive device can be enclosed with an electric motor in the housing of an electric axle.
[0036] The electric axle can be installed easily and compactly in the vehicle.
[0037] According to a preferred embodiment of the electric drive device, it comprises a first bearing device with which the transmission input shaft can be fixed and supported radially and / or axially at least in one direction on an outer side of the transmission input shaft.
[0038] According to a preferred embodiment of the electric drive device, it comprises a second bearing device which can be positioned at a transition between the rotor shaft and the transmission input shaft and with which the transmission input shaft and the rotor shaft can each be fixed and mounted radially and / or axially in at least one direction on an outer side.
[0039] According to a preferred embodiment of the electric drive device, it comprises a third bearing device which can be positioned at a second end of the rotor shaft, which is remote from the first region, and with which the rotor shaft can be radially fixed to an outer side of the rotor shaft and / or axially prestressed and mounted at least in one direction.
[0040] The general storage concept can also be implemented differently.
[0041] According to a preferred embodiment of the electric drive device, it comprises a first spring device which is arranged at the second end of the rotor shaft and with which the rotor shaft can be prestressed in a specific axial position and direction.
[0042] According to a preferred embodiment of the electric drive device, it comprises a second spring device that can be sandwiched between the head region and the inner seat and with which the head region can be axially preloaded relative to the inner seat. Thus, such a spring element can also be used to implement preload.
[0043] According to the invention, in the method for producing an electric drive device for a vehicle, a rotor with a rotor shaft is provided; a transmission with a transmission input shaft is provided, wherein the rotor shaft comprises a first spline in a first region and the transmission input shaft comprises a second spline in a second region, and the first region is connected by means of the first spline to the second region by means of the second spline, wherein the first spline is located on a radial outer side of the first region and the transmission input shaft is a hollow shaft and the second spline is formed on an inner wall of the transmission input shaft in the second region;and providing a connecting element which is connected to the first region or to the second region and wherein the connecting element is placed in a cavity of the hollow shaft on an inner seat of the inner wall of the transmission input shaft or on a support region on the rotor shaft, whereby the transmission input shaft and the rotor shaft are axially fixed to one another.;
[0044] A split shaft design according to the invention can achieve a number of advantages compared to a one-piece design, whereby stress-appropriate materials for both shafts (and at the same time lower mass for heat treatment) can be used.
[0045] The method can also advantageously be characterized by the features of the electric drive device already mentioned and vice versa.
[0046] Further features and advantages of embodiments of the invention will become apparent from the following description with reference to the accompanying drawings.
[0047] Brief description of the drawings The present invention is explained in more detail below with reference to the exemplary embodiments shown in the schematic figures of the drawing.
[0048] They show:
[0049] Fig. 1 is a schematic representation of an electric drive device according to an embodiment of the present invention;
[0050] Fig. 2a is a front view of the shafts plugged together with a connecting element in an electric drive device according to an embodiment;
[0051] Fig. 2b is a side sectional view of the shafts plugged together with a connecting element in an electric drive device according to an embodiment;
[0052] Fig. 3 is a schematic representation of an electric drive device according to a further embodiment of the present invention;
[0053] Fig. 4 is a schematic representation of an electric drive device according to a further embodiment of the present invention;
[0054] Fig. 5a shows a connecting element of the electric drive device according to a further embodiment of the present invention;
[0055] Fig. 5b shows the connecting element from Fig. 5a in a perspective view; and
[0056] Fig. 6 is a block diagram of method steps of a method for producing an electric drive device according to an embodiment of the present invention.
[0057] In the figures, identical reference numerals denote identical or functionally identical elements. Fig. 1 shows a schematic representation of an electric drive device according to an embodiment of the present invention.
[0058] The electric drive device 10 for a vehicle comprises a rotor with a rotor shaft RW; a transmission with a transmission input shaft GW, wherein the rotor shaft RW comprises a first spline SZ1 in a first region RW1, preferably at an end region, and the transmission input shaft GW comprises a second spline SZ2 in a second region GW2, preferably at an end region, and the first region RW1 can be connected by means of the first spline SZ1 to the second region GW2 by means of the second spline SZ2, wherein the first spline SZ1 is located on a radial outer side of the first region RW1 and the transmission input shaft GW is a hollow shaft and the second spline SZ2 is formed on an inner wall IW of the transmission input shaft GW in the second region GW2;and a connecting element VP, preferably a pressing element VP, which can be press-connected to the first region RW1 and wherein the connecting element VP can be placed in a cavity HR of the hollow shaft on an inner seat IS of the inner wall IW of the transmission input shaft GW, whereby the transmission input shaft GW and the rotor shaft RW can be fixed axially to one another.;
[0059] According to Fig. 1, the connecting element VP is a pin ST with a head region KB, for example a plug, wherein the pin ST is pressed into a recess A in the first region RW1 of the rotor shaft RW and the head region KB in the cavity HR of the hollow shaft rests on the inner seat IS of the inner wall IW of the transmission input shaft GW and the two shafts are thus axially fixed to one another. The pressing is advantageously carried out in that the pin can have a diameter which can be slightly larger than a diameter of the recess A and the pin ST can therefore be pressed into the recess using force. The pin ST can thus be pressed onto the first region RW1 and in the recess A in such a way that the pin ST can remain immovable on the rotor shaft RW despite a predetermined holding force. The pin ST can be pushed into the recess A to a certain depth.A certain gap may remain between the head area KB and the rotor shaft RW. This axial gap can be advantageous for tolerance compensation / reduction in the tolerance chain.
[0060] The inner seat IS can simply be the edge of the second spline SZ2 or a specially formed shoulder or collar mil / as a change in the inner radius of the hollow shaft, against which the head area KB can lean (support) axially.
[0061] According to Fig. 1, the electric drive device 10 comprises a first bearing device L1, for example a ball bearing, with which the transmission input shaft GW can be fixed and supported radially and / or axially in at least one direction on an outer side of the transmission input shaft GW. A projection can be provided on the outer side of the transmission input shaft GW, for example, toward the rotor shaft, in order to block the axial displacement of the first bearing device L1 relative to the rotor shaft. The first bearing device L1 can also bear against a projection of the transmission housing and be fixed in the other direction.Furthermore, the electric drive device 10 can comprise a second bearing device L2, for example a ball bearing, which can be positioned at a transition between the rotor shaft RW and the transmission input shaft GW and with which the transmission input shaft GW and the rotor shaft RW can each be fixed and mounted radially and / or axially in at least one direction on an outer side. Likewise, the transmission input shaft GW can each comprise a radial projection in the second region GW2, facing the rotor shaft, and the rotor shaft RW can each comprise a radial projection in the first region RW1, facing the transmission shaft GW, between which the second bearing device L2 can be inserted and the movement of the second bearing device L2 and / or the adjacent shafts in the corresponding direction can be axially blocked.
[0062] Furthermore, the electric drive device 10 can comprise a third bearing device L3, such as a ball bearing, which can be positioned at a second end E2 of the rotor shaft RW, which faces away from the first region RW1, and with which the rotor shaft RW can be radially fixed on an outer side and / or axially preloaded and supported at least in one direction. For this purpose, a first spring device FE1 can be provided, which can be arranged at the second end E2 of the rotor shaft RW and which can tension against the third bearing device L3 and with which the rotor shaft RW can be preloaded in a specific axial position and direction.
[0063] According to the invention, the likelihood of axial movement between the two shafts can be advantageously prevented or at least reduced, while providing a simple assembly option. Furthermore, the inventive design can result in a cost-effective design and a backlash-free connection (e.g., with an acceptable tolerance) can be achieved.
[0064] The transmission input shaft GW can thus be supported in axial direction by means of the first bearing device L1 and the second bearing device L2, which can be preloaded ball bearings.
[0065] arrangement.
[0066] The third bearing device L3 can be adjusted by the first spring device FE1, for example as a wave spring, against the axial arrangement of the other two bearings.
[0067] One advantage is the compensation of the different thermal expansion between the rotor shaft (steel) and the housing (aluminum) surrounding the EM area (the area of the electric machine). Compensation may be necessary to ensure consistent axial forces acting on the bearings across the entire operating range.
[0068] This can be advantageous in terms of NVH and bearing life.
[0069] Since different areas of the housing can expand differently with temperature, the first spring device FE1 can, for example, compensate for or reduce a resulting axial displacement of the rotor shaft, which can then be applied to the third bearing device L3 and the rotor housing. A rotor position sensor 8 can be provided at the second end E2.
[0070] An oil flow can pass from the gearbox through the cavity HR and through the deviations from the outer radius of the head area KB to the two splines SZ1 and SZ2 and through these, further along the edge of the rotor shaft and through the second bearing device L2.
[0071] Fig. 2a shows a front view of the shafts plugged together with a connecting element in an electric drive device according to an embodiment.
[0072] The front view corresponds to a view from the cavity of the transmission input shaft toward the rotor shaft. On the outer side, a ball bearing is shown, which rotates around the two interlocking splines SZ1 and SZ2. On the inner side, the flat upper surface (in the axial direction) of the head area KB of the connecting element VP can be seen, which can have regular flats AF from the maximum outer radius of the head area KB. At the flats AF, the variation in the radius of the head area KB is sufficient that the contact area of the two splines SZ1 and SZ2 can be seen from the axial direction, allowing oil to flow past the head area KB.
[0073] In this way, the oil flow from the transmission input shaft into the spline can be maintained.
[0074] Fig. 2b shows a side sectional view of the assembled shafts with a connecting element in an electric drive device according to an embodiment.
[0075] Fig. 2b shows a section of the view similar to Fig. 1. The head region KB can have flattened portions AF, such as those shown in Fig. 2a, to allow oil flow to the splines. Fig. 2b further shows that the pin ST can also be only partially inserted into the recess A; for example, a residual gap can remain at the bottom of the recess A. Fig. 3 shows a schematic representation of an electric drive device according to a further embodiment of the present invention.
[0076] The arrangement of Fig. 3 is similar to that of Fig. 1 , but it includes a second spring device FE2 which can be sandwiched between the head region KB and the inner seat IS and the rotor shaft RW and with which the head region KB can be axially prestressed relative to the inner seat IS and the rotor shaft.
[0077] The second spring device FE2 can further dampen axial movement.
[0078] Fig. 4 shows a schematic representation of an electric drive device according to another embodiment of the present invention.
[0079] Fig. 4 shows in more detail how the transmission input shaft GW and the rotor shaft RW can also be axially blocked, fixed and supported by a bearing using three bearing devices. The connecting element VP can be pressed into the recess A and rest with the head area KB on the inner seat IS of the transmission input shaft GW, forming a blocking contact BL there, whereby an axial movement of the rotor shaft RW and transmission shaft GW in opposite directions can be blocked. A further blocking contact BL can be present between the second bearing device L2 and the transmission input shaft GW and towards the transmission input shaft GW, wherein the second bearing device L2 can rest against a radial projection of the transmission input shaft GW. The second bearing device L2 can also have a further blocking contact BL towards the rotor shaft RW, wherein the second bearing device L2 can rest against a radial projection of the rotor shaft RW.Both block contacts BL can be formed by an inner ring of the ball bearing of the second bearing device L2 opposite the respective adjacent radial projections. The inner ring of the ball bearing of the second bearing device L2 can be inserted between these radial projections of the shafts. This can block the axial movement of the two shafts relative to each other and, under certain circumstances, the arrangement can also be free of play. The interference fit can make the position of the pin free of play or at least reduce the play. By preventing or reducing the axial movement, the impact of the rotor on the NVH behavior of the overall system can be significantly improved in the first order, thus reducing disturbance contributions.
[0080] Fig. 5a shows a connecting element of the electric drive device according to a further embodiment of the present invention.
[0081] Fig. 5a shows a possible design of the plate of the head area KB in a top view in the axial direction. The outer contour of the plate of the head area KB can have a flower shape, with regular curved radial variations of the outer radius RA of the head area between a respective maximum R1 and a minimum R2. These deviations can result in an oil flow OF to the splines of the shafts. The maximum R1 of the outer radius can be smaller than the radius of the inner wall of the gear shaft but larger than the radius of the inner seat IS in order to be able to support itself axially on it.
[0082] The minimum R2 can be small enough to allow oil flow past the head area to the first and / or second spline. Alternatively, it is also possible for different cam contours to follow one another, allowing axial support and oil flow to the splines.
[0083] Fig. 5b shows the connecting element from Fig. 5a in a perspective view.
[0084] Fig. 5b shows a side perspective view of the design of the connecting element VP from Fig. 5a, which shows the same deviations AW of the plate radius. The pin ST can be connected perpendicularly to the plate of the head area KB. In the axial direction away from the pin ST, a cylindrical contour ZK with a radius smaller than the contour(s) of the plate can be present and extend perpendicularly away from the plate of the head area KB. This cylindrical contour ZK can represent an assembly aid to better insert the connecting element VP (into the recess). Instead of the cylindrical contour, a hole can also be present in the plate.
[0085] Fig. 6 shows a block diagram of method steps of a method for producing an electric drive device according to an embodiment of the present invention.
[0086] In the method for producing an electric drive device for a vehicle, a provision S1 of a rotor with a rotor shaft takes place; a provision S2 of a gearbox with a gearbox input shaft, wherein the rotor shaft comprises a first spline in a first region and the gearbox input shaft comprises a second spline in a second region, and the first region is connected by means of the first spline to the second region by means of the second spline, wherein the first spline is located on a radial outer side of the first region and the gearbox input shaft is a hollow shaft and the second spline is formed on an inner wall of the gearbox input shaft in the second region;and providing S3 a connecting element which is connected to the first region or to the second region and wherein the connecting element is placed in a cavity of the hollow shaft on an inner seat of the inner wall of the transmission input shaft or on a support region on the rotor shaft, whereby the transmission input shaft and the rotor shaft are axially fixed to one another.;
[0087] Although the present invention has been fully described above using the preferred embodiment, it is not limited thereto but can be modified in many ways.
Claims
Claims 1 . Electric drive device (10) for a vehicle (F), comprising: - a rotor with a rotor shaft (RW); - a transmission with a transmission input shaft (GW), wherein the rotor shaft (RW) comprises a first spline (SZ1) in a first region (RW1) and the transmission input shaft (GW) comprises a second spline (SZ2) in a second region (GW2), and the first region (RW1) can be connected by means of the first spline (SZ1) to the second region (GW2) by means of the second spline (SZ2), wherein the first spline (SZ1) is located on a radial outer side of the first region (RW1) and the transmission input shaft (GW) is a hollow shaft and the second spline (SZ2) is formed on an inner wall (IW) of the transmission input shaft (GW) in the second region (GW2);and a connecting element (VP) which can be connected to the first region (RW1) or to the second region (GW2), and wherein the connecting element (VP) can be placed in a cavity (HR) of the hollow shaft on an inner seat (IS) of the inner wall (IW) of the transmission input shaft (GW) or on a support area on the rotor shaft (RW), whereby the transmission input shaft (GW) and the rotor shaft (RW) can be fixed axially to one another.; 2. Electric drive device (10) according to claim 1, wherein the connecting element (VP) can be connected to the first region (RW1) or to the second region (GW2) by means of an adhesive connection or the connecting element (VP) is a pressing element and can be connected to the first region (RW1) or to the second region (GW2) in a press-fit manner.
3. Electric drive device (10) according to claim 1 or 2, wherein the connecting element (VP) is a ring which can be placed and glued or pressed onto an adhesive or pressing area on the second area (GW2) or onto a projection area on the first area (RW1) or the connecting element (VP) is a pin (ST) with a head area (KB), wherein the pin (ST) can be pressed into a recess (A) in the first area (RW1) of the rotor shaft (RW) and the ring or the head area (KB) in the cavity (HR) of the hollow shaft can be placed on the inner seat (IS) of the inner wall (IW) of the transmission input shaft (GW).
4. Electric drive device (10) according to claim 3, wherein the ring or the pin (ST) can be pressed onto the first region (RW1) or into the recess (A) in such a way that the ring or the pin (ST) remains immovable on the rotor shaft (RW) with respect to a predetermined holding force.
5. Electric drive device (10) according to claim 3 or 4, wherein the ring or the head region (KB) in a plan view along an axis of symmetry of the transmission input shaft (GW) deviates radially inwards in some regions from a predetermined inner radius (IR) of the inner seat (IS), so that an oil can be conducted through the hollow shaft and past the head region (KB) to the first spline (SZ1) and / or second spline (SZ2).
6. Electric drive device (10) according to one of claims 1 to 5, which comprises a first bearing device (L1) with which the transmission input shaft (GW) can be fixed and supported radially and / or axially in at least one direction on an outer side of the transmission input shaft (GW).
7. Electric drive device (10) according to one of claims 1 to 6, which comprises a second bearing device (L2) which can be positioned at a transition between the rotor shaft (RW) and the transmission input shaft (GW) and with which the transmission input shaft (GW) and the rotor shaft (RW) can each be fixed and mounted radially and / or axially in at least one direction on an outer side.
8. Electric drive device (10) according to one of claims 1 to 7, which comprises a third bearing device (L3) which can be positioned at a second end (E2) of the rotor shaft (RW), which is remote from the first region (RW1), and with which the rotor shaft (RW) can be radially fixed on an outer side and / or axially prestressed and mounted at least in one direction.
9. Electric drive device (10) according to claim 8, which comprises a first spring device (FE1) which is arranged at the second end (E2) of the rotor shaft (RW) and with which the rotor shaft (RW) can be moved into a specific axial position and direction can be prestressed 10. Electric drive device (10) according to one of claims 3 to 9, as far as dependent on claim 3, which comprises a second spring device (FE2) which can be enclosed between the head region (KB) and the inner seat (IS) and with which the head region (KB) can be axially prestressed relative to the inner seat (IS) 11. A method for producing an electric drive device (10) for a vehicle (F), comprising the steps: - Providing (S1) a rotor with a rotor shaft (RW); - Providing (S2) a transmission with a transmission input shaft (GW), wherein the rotor shaft (RW) comprises a first spline (SZ1) in a first region (RW1) and the transmission input shaft (GW) comprises a second spline (SZ2) in a second region (GW2), and the first region (RW1) is connected by means of the first spline (SZ1) to the second region (GW2) by means of the second spline (SZ2), wherein the first spline (SZ1) is located on a radial outer side of the first region (RW1), the transmission input shaft (GW) is a hollow shaft, and the second spline (SZ2) is formed on an inner wall (IW) of the transmission input shaft (GW) in the second region (GW2); and - Providing (S3) a connecting element (VP) which is connected to the first region (RW1) or to the second region (GW2) and wherein the connecting element (VP) is placed in a cavity (HR) of the hollow shaft on an inner seat (IS) of the inner wall (IW) of the transmission input shaft (GW) or on a support area on the rotor shaft (RW), whereby the transmission input shaft (GW) and the rotor shaft (RW) are fixed axially to one another.