Electric motor rotor shaft, rotor shaft assembly, and method for manufacturing a rotor shaft assembly

Abstract

The invention relates to a rotor shaft (1) of an electric motor (2), in particular for an aircraft engine, having a forged mounting flange (3), the mounting flange (3) being provided for mounting on another shaft (6) for transmitting forces and / or torques, the rotor shaft (1) having a first axial end (4) facing the other shaft (6) and a base plate (8) at a second axial end opposite the first axial end (4). It is provided that the rotor shaft (1) has at least some areas of an additively manufactured coolant distribution body (9), the additively manufactured coolant distribution body (9) being radially centered on the base plate (8) of the forged mounting flange (3), the rotor shaft (1) having a rotor arrangement (12) radially surrounding the additively manufactured coolant distribution body (9) and joined to the base plate (8) of the forged mounting flange (3) by at least a press fit.

Description

[Technical field]

[0001] The invention relates to a rotor shaft of an electric motor, in particular for an aircraft engine, according to the features of the preamble of claim 1, to an assembly of a rotor shaft according to the features of the preamble of claim 11 and to a method for manufacturing an assembly of a rotor shaft according to the features of the preamble of claim 12. [Background technology]

[0002] The electric motor comprises a stator and a rotor. The rotor of the electric motor is thereby arranged on the rotor shaft. During the operation of the electric motor, the rotor of the electric motor rotates and the torque induced in the rotor is transmitted to the gearbox via the rotor shaft. In order to be able to transmit the torque to the gearbox, the rotor shaft has a rotor flange in the front region, in which the gearbox shaft can be arranged. In the design of the respective rotor shaft, it is necessary to ensure that the rotor shaft is stable enough to transmit the torque provided by the rotor. In order to be able to transmit the torque provided, the rotor flanges and the rotor shaft in the megawatt and gigawatt range are manufactured from forged alloys. In these power ranges, it may be necessary to cool the rotor by supplying a coolant. The supply of the coolant may take place, for example, through the rotor shaft. For this purpose, it is necessary to arrange coolant channels in the rotor shaft, which allow the coolant to be delivered to the rotor and to be discharged from the rotor.

[0003] However, the channel structure formed by the coolant channels may involve complexities that cannot be realized by a forged rotor shaft.

[0004] The feasibility of manufacturing rotor shafts including complex cooling channel structures lies in manufacturing them by additive manufacturing. A drawback of additively manufactured rotor shafts is their lower ability to withstand mechanical loads compared to forged rotor shafts. As a result, additively manufactured rotor shafts cannot meet certain safety standards for rotor shafts.

[0005] However, the use of a forged rotor shaft containing simpler cooling channel configurations reduces the cooling capacity, resulting in a reduced power density of the electric motor.

[0006] EP3580434A1 discloses a part and a method of manufacturing a part using additive manufacturing. The method discloses the use of additive manufacturing on a base substrate of a component, whereby an annular portion of the component may be additively applied to the base portion of the component. The annular portion of the component may be formed to have different material properties than the base portion of the component.

[0007] US Patent Application Publication No. 2016 / 0010469A1 discloses a method of manufacturing a rotor that includes fabricating a hub using conventional manufacturing methods and fabricating blades or vanes on the hub using layer-by-layer additive manufacturing methods.

[0008] EP 2 772 329 A1 discloses a method for manufacturing a hybrid component, in which a preform is produced as a first part of the hybrid component, to which a second part of the component made from a metal powder material is then applied by successive deposition by an additive manufacturing process.

[0009] EP 3840197 A1 describes a method for producing a rotor for an electrical generator, in which it is provided that at least a part of the rotor shaft is manufactured by a three-dimensional (3D) printing method, and the step of printing the rotor core includes printing a plurality of liquid coolant lines extending through the rotor core.

[0010] EP 3654501 A1 discloses an additively formed rotor component for an electric machine and a method for manufacturing the additively formed rotor component. The formed rotor component may comprise a rotor assembly or a rotor shaft. For example, a first portion of the rotor shaft may be printed by additive manufacturing. A second portion of the rotor shaft may be formed centrally within a rotor core. Cooling tubes may be formed through portions of the rotor core to be uniform. The cooling tubes may be printed by additive manufacturing on each layer of the rotor core. The cooling tubes may define cooling holes. Summary of the Invention [Problem to be solved by the invention]

[0011] SUMMARY OF THE DISCLOSURE The object of the present invention is to provide a rotor shaft which allows the necessary cooling of the rotor while at the same time having the necessary stability to transmit a given torque. [Means for solving the problem]

[0012] According to the invention, this problem is solved by a rotor shaft of an electric motor, in particular for an aircraft engine, according to the features of claim 1, by an assembly of a rotor shaft according to the features of claim 11 and by a method for manufacturing an assembly of a rotor shaft according to the features of claim 12. Advantageous embodiments according to appropriate further developments of the invention are specified in the respective dependent claims, whereby advantageous embodiments of each aspect of the invention are to be regarded as advantageous embodiments of each other aspect of the invention.

[0013] A first embodiment of the invention relates to a rotor shaft of an electric motor, in particular for an aircraft engine. In other words, a rotor shaft may be provided for use in an electric motor, which may in particular be designed as an aircraft engine. The rotor shaft is provided to have a mounting flange by forging. The mounting flange may be cast or produced by powder metallurgy and forging. In other words, the mounting flange is produced by a casting method or by a powder metallurgy and forging method. The mounting flange is provided to be mounted on another shaft in order to transmit forces and / or torques. In other words, the mounting flange is designed for mounting on the other shaft. The other shaft may include a gearbox shaft to which the supply torque of the electric motor is transmitted. The mounting flange has a first axial end that is aligned with respect to the direction of the other shaft. The first axial end may therefore face the other shaft in the axial direction. The mounting flange has a base plate at a second axial end opposite the first axial end. In other words, the mounting flange is delimited at the second axial end by a base plate.

[0014] The invention provides a rotor shaft having at least some regions of an additively manufactured coolant distribution body, where the additively manufactured coolant distribution body of at least some regions is radially centered on the base plate of the forged mounting flange. In other words, the coolant distribution body, which is axially centered on the base plate and additively manufactured in at least some regions, is located on the mounting flange. The additively manufactured coolant distribution body can be placed on the base plate of the mounting flange by press-fitting, form-fitting or material-bonding. The coolant distribution body can have a cylindrical shape and can extend centered along the longitudinal axis of the rotor shaft, like the mounting flange.

[0015] The rotor shaft has a rotor arrangement which radially surrounds the additively manufactured coolant distribution body and is joined to the base plate of the forged mounting flange at least by press-fitting, in particular by direct press-fitting. In other words, the additively manufactured coolant distribution body is surrounded by the rotor arrangement along its outer surface. The rotor arrangement can, for example, be placed on the outer surface of the coolant distribution body. The rotor arrangement can have a coil and a core and can be cooled by a coolant supplied by the coolant distribution body during operation. The coolant distribution body is thereby configured to be able to deliver the coolant to the rotor arrangement or to be able to discharge the coolant from the rotor arrangement. In order to reduce any load on the coolant distribution body due to the transmitted torque, the rotor arrangement can be joined to the base plate of the forged mounting flange at least by press-fitting. In this way, torques induced in the rotor arrangement, in particular directly and / or indirectly, can be transmitted to the base plate and / or via the base plate to the mounting flange. Because the torque transmission is via the base plate, the mechanical load on the coolant distribution body is reduced and therefore the coolant distribution body needs to have less mechanical stability than would be required in the case of the sole transmission of torque via the coolant distribution body.

[0016] The present invention provides the advantage of allowing the use of additively manufactured coolant distribution bodies in at least some areas, since the majority of the torque generated is transferred to the base plate of the mounting flange.

[0017] A further development of the invention provides that the mounting flange has at its first axial end a fitting for mounting the other shaft. In other words, the mounting flange is configured such that the other shaft is mounted on a fitting of the mounting flange. The fitting is located at the first axial end of the mounting flange.

[0018] A further development of the invention provides that the rotor shaft comprises an external mounting element configured to join the mounting flange to the other shaft. The external mounting element may be designed to allow an external mounting of the mounting flange to the other shaft. The external mounting element may be designed to allow a press-fit and / or form-fit connection to the mounting flange in order to transmit forces and / or torques from the mounting flange via the external mounting element to the other shaft. The external mounting element may be designed for example to be press-fit and / or form-fit mounted to a fitting or a mounting flange. In addition, the external mounting element may be designed for example to be press-fit and / or form-fit mounted to the other shaft.

[0019] A further development of the invention provides that at least some of the regions of the additively manufactured coolant distribution body have coolant channels in fluid communication with channel openings of an outer surface of the additively manufactured coolant distribution body of at least some of the regions. In other words, the coolant distribution body has cooling channels configured to transport coolant through the coolant distribution body. The channel openings are configured to allow delivery of coolant to and evacuation of coolant from the rotor arrangement.

[0020] A further development of the invention provides that at least some regions of the additively manufactured coolant distribution body are provided with an axially extending coolant delivery element at the end facing away from the mounting flange. In other words, the coolant delivery element extending axially along the axis of the shaft is arranged at the end of the coolant distribution body that is axially opposite the mounting flange. The coolant delivery element can have a delivery line and a discharge line to allow delivery of coolant to the coolant distribution body and discharge of coolant from the coolant distribution body.

[0021] A further development of the invention provides that at least some of the coolant channels are in fluid communication with the cooling channels of the mounting flange, in other words the mounting flange has at least one cooling channel in fluid communication with at least one cooling channel of the coolant distribution body, which provides the advantage that the coolant can be delivered further to the mounting flange.

[0022] A further development of the invention provides that the rotor arrangement is connected to the mounting flange by a coupling device. In other words, the rotor shaft has a coupling device that is configured to couple the rotor arrangement to the mounting flange in such a way that a direct torque transmission from the rotor arrangement to the mounting flange is possible. For example, the coupling device can in particular produce a direct and / or indirect press-fit, form-fit and / or material-joint connection between the rotor arrangement and the mounting flange.

[0023] A further development of the invention provides that the coupling device has first tie rods fixed to the rotor arrangement and to the mounting flange, in other words the coupling device comprises first tie rods, where each first tie rod is fixed to both the rotor arrangement and to the mounting flange, which provides the advantage that a torque induced in the rotor arrangement to the mounting flange can be transferred via the first tie rods.

[0024] A further development of the invention provides that the rotor arrangement comprises a rotor unit arranged axially between two flange plates, the two flange plates being joined to each other by a second tie rod. In other words, the rotor arrangement comprises a rotor unit. The rotor unit may, for example, have a rotor coil and a core. On both axial ends of the rotor arrangement, two flange plates are arranged, which may, for example, be forged. To join the flange plates to each other and to the rotor unit, the rotor arrangement has second tie rods, which may be fixed to the two flange plates, respectively.

[0025] A further development of the invention provides that the coolant distribution body is applied to the mounting flange by material bonding. In other words, the at least partially additively manufactured coolant distribution body is applied to the mounting flange in such a way that a material bond connection is formed between the mounting flange and the coolant distribution body. This further development provides the advantage that a particularly stable mechanical connection is provided between the mounting flange and the coolant distribution body.

[0026] A second aspect of the invention relates to an assembly of a rotor shaft. The assembly comprises a mounting flange by forging, where the mounting flange is provided to be attached to another shaft for transmitting forces and / or torques. In other words, the mounting flange is designed to be attached to another shaft. The other shaft may include a gearbox shaft to which the supply torque of the electric motor is transmitted. The mounting flange has a first axial end that is aligned in the direction of the other shaft. The first axial end may thus axially face the other shaft. The mounting flange has a base plate at a second axial end located opposite the first axial end. In other words, the mounting flange is delimited at the second axial end by the base plate.

[0027] The rotor shaft has an additively manufactured coolant distribution body in at least some regions, and it is provided that the additively manufactured coolant distribution body is radially centered and disposed on a base plate of a forged mounting flange of the assembly.

[0028] Further features and advantages thereof can be gathered from the description of the first aspect of the invention.

[0029] A third aspect of the invention relates to a method for manufacturing a rotor shaft assembly, in which it is provided that a coolant distribution body is applied according to a predefined additive manufacturing method onto a forged mounting flange with a base plate, whereby the coolant distribution body is radially centered on the forged mounting flange base plate.

[0030] Further features and advantages thereof can be gathered from the description of the first and second aspects of the invention.

[0031] Further features of the invention result from the claims, the drawings and the description of the drawings. The features and combinations of features described above in the description and the features and combinations of features shown below in the description of the drawings and / or in the drawings alone can be used not only in the respective specified combinations but also in other combinations without departing from the scope of the invention. Thus, embodiments of the invention that are not explicitly shown or described in the drawings, but may result from the embodiments of the description by separate combinations of features, should also be considered to be included and disclosed. Thus, embodiments and combinations of features that do not have all the features of the independent claims as originally clearly expressed should also be considered to be disclosed. Besides this, combinations of features according to the embodiments and particularly the above-mentioned embodiments that go beyond or deviate from the combinations of features discussed with reference back to the claims should also be considered to be disclosed. [Brief description of the drawings]

[0032] [Figure 1] 1 is a schematic diagram of a rotor shaft of an electric motor according to the present invention;

[0033] [Diagram 2] 2 is a schematic diagram of a rotor shaft assembly according to the present invention;

[0034] [Diagram 3] 2 is a schematic diagram of a method for manufacturing a rotor shaft assembly according to the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] FIG. 1 is a schematic view of a rotor shaft of an electric motor. The rotor shaft 1 may in particular be provided in an electric motor 2 of an aircraft engine. The rotor shaft 1 may have a forged mounting flange 3, which may for example be made from a titanium alloy according to a predefined forging process. The mounting flange 3 may have at a first axial end 4 a mounting 5 for mounting another shaft 6, for example a gearbox shaft. The first axial end 4 may face the other shaft 6. The mounting flange 3 may have at a second axial end 7 a base plate 8. The mounting flange 3 may be provided for transmitting the torque of the rotor shaft 1 to the other shaft 6.

[0036] As an alternative or in addition to the mounting 5, in an embodiment not shown, the rotor shaft may comprise an external mounting element (not shown) configured to join the mounting flange 3 to the other shaft 6. The external mounting element may be designed to allow for external mounting of the mounting flange 3 to the other shaft 6, for example as a mounting section of the other shaft 6 surrounding the mounting flange 3 from the outside and / or within which the mounting flange 3 is mounted. The external mounting element may be designed to allow for a direct or indirect press-fit and / or form-fit connection between the mounting flange 3 and the other shaft 6, in order to transfer forces and / or torques from the mounting flange 3 to the other shaft 6 via the external mounting element. The external mounting element may be a section of the other shaft 6 or may be formed integrally therewith in one piece (direct connection), or the external mounting element may be an additional or separate part of the other shaft 6 and the mounting flange 3 (indirect connection). The other shaft 6 may also be directly or indirectly connected to the mounting flange 3, so that a direct or indirect transfer of forces or torques may be made possible.

[0037] The additively manufactured coolant distribution body 9 may be arranged on the mounting flange 3 and may be centered around the longitudinal axis 10 of the rotor shaft 1 as the mounting flange 3. The at least partially additively manufactured coolant distribution body 9 may have a cylindrical shape that may extend along the longitudinal axis 10 of the rotor shaft 1. The at least partially additively manufactured coolant distribution body 9 may be joined to the mounting flange 3 by press-fitting, form-fitting or material bonding. The coolant distribution body 9 may be applied, for example, by a given additive manufacturing method directly onto the mounting flange 3 serving as a substrate and may be made, for example, from a titanium alloy. In the coolant distribution body 9, coolant distribution body coolant channels 11 may be provided by the use of additive manufacturing methods. The coolant channels 11 may be configured to deliver the coolant supplied to the coolant distribution body 9 to the rotor device 12 or to drain it from the rotor device 12. To this end, the individual coolant channels 11 may be in fluid communication with openings 13 that may be located on the outer surface 14 of the coolant distribution body 9. To deliver the coolant to the coolant distribution body 9 or to drain it from the coolant distribution body 9, the coolant distribution body 9 can have a coolant supply element 15. The coolant supply element 15 can be arranged on the side of the coolant distribution body 9 facing away from the base plate 8. The coolant delivery element 15 can have, for example, two channels for delivering or draining the coolant. The coolant distribution body 9 can be at least radially surrounded by a rotor device 12. The rotor device 12 can have a coil core that is cooled by the coolant conveyed through the coolant distribution body 9. The rotor device 12 can be mounted, for example, on the outer surface 14 of the coolant distribution body 9.

[0038] For reasons of additive manufacturing, the coolant distribution body 9 has a lower mechanical stability than the forged components of the rotor shaft. It may therefore be necessary to design the rotor shaft 1 in such a way that the torque is transmitted from the rotor arrangement 12 to the mounting flange 3 in a different way. For this purpose, the rotor arrangement 12 may have flange plates 16 which may be arranged on both sides in the axial direction of the rotor unit 17. The flange plates 16 may consist of forged titanium. The two flange plates 16 may be joined to each other by a second tie rod 18 which may be fixed to the respective flange plate 16. The second tie rod 18 may be joined to the rotor unit 17 in order to torque-transmittingly connect the functional parts of the rotor arrangement 12 to the flange plates 16. As a connecting device 19 for the transmission of torque from the rotor arrangement 12 to the mounting flange 3, the rotor shaft 1 may have a first tie rod 20 which may be fixed to at least one of the flange plates 16 and to the mounting flange 3, respectively. In this way, the power provided by the rotor arrangement 12 may be transmitted directly to the mounting flange 3, and thus the part of the torque transmitted through the coolant distribution body 9 is reduced.

[0039] FIG. 2 shows a schematic diagram of an assembly of a rotor shaft. The assembly 21 can have a mounting flange 3, which can be manufactured according to a forging method. The mounting flange 3 can, for example, consist of a titanium alloy. The mounting flange 3 can have a mounting 5 for the mounting of another shaft 6, not shown in the drawing, at a first axial end 4. The mounting flange 3 can have a base plate 8 at a second axial end 7 of the mounting flange 3. The mounting flange 3 can have coolant channels 22, which can be arranged at the second axial end. The coolant distribution body 9 can be at least partially additively manufactured and thereby applied on the mounting flange 3 in a material-bonding manner. The coolant distribution body 9 can likewise consist of a titanium alloy. It can be realized that the coolant distribution body 9 is applied on the mounting flange 3 such that the coolant channels 11 of the coolant distribution body 9 can be fluidly connected with the coolant channels 22 of the mounting flange 3. The coolant channels 11 of the coolant distribution body 9 may be fluidly connected with the openings 13 of the coolant distribution body 9 so that the coolant from the coolant distribution body 9 may be delivered to and discharged from the rotor arrangement. To enable delivery and discharge of the coolant within the coolant distribution body 9, the coolant distribution body 9 may have a coolant supply element 15 which may have, for example, two main channels 23 for delivery and discharge of the coolant.

[0040] 3 shows a schematic diagram of a method for manufacturing an assembly. In a first step S1 of the method, a forged mounting flange 3 is placed in a powder bed 24 of an additive manufacturing apparatus 25. The mounting flange 3 may be arranged such that a base plate 8, which is placed at a second axial end 7, is horizontally aligned. The openings of the coolant channels 22 of the mounting flange 3 may be located in the horizontally aligned base plate 8.

[0041] In a second method step S2 of the method, the coolant distribution body 9 can be applied to the mounting flange by additive manufacturing. The mounting flange 3 can thereby become a substrate for the coolant distribution body 9. Furthermore, it can also be that the powder is applied layer by layer and heated locally along the joining area. The layer by layer application can be performed such that a predetermined structure of the coolant channels 11 of the coolant distribution body 9 can be provided.

[0042] In a third step S3 of the method, for example, a coolant supply element 15 can be arranged on the coolant distribution body 9 either additionally or by means of a forged element.

[0043] Since the rotor shaft 1 must transmit the full power of the new electric motor to the gearbox, the front part of the rotor shaft, the motor flange, also called mounting flange 3, is subjected to very high loads, while other areas of the rotor shaft 1 are subjected to lesser loads in comparison. The latter, however, can or must be equipped with complex cooling structures in the coolant distribution body 9 in order to be able to achieve the target power density. However, a solidly designed mounting flange 3 requires a considerable effort in terms of additive manufacturing time, which entails the risk of a longer required time, longer scanning lengths, larger melting surfaces and the disadvantages of greater wall thickness making it difficult to detect inside. For economic reasons, such simple mounting flange geometries should be traditionally produced using conventional methods in a safer and more economical way and then joined to the additional shaft section including the cooling structures that cannot be produced by conventional means.

[0044] The rotor shaft 1 can be realized as shown in FIG. 1 with a front mounting flange 3, a flange plate 16, a coolant distribution body 9, an aft flange plate 16, and a coolant supply element 15 through which the cooling medium can be delivered and discharged.

[0045] The rotor unit 17 of the electric motor can be clamped between the front and rear flange plates 16 by means of a second tie rod. At the mounting flange 3, the force is introduced from the motor unit being clamped via the long first tie rod. In addition, the mounting flange can be joined to the flange plates 16 by a press fit and / or a form fit.

[0046] Furthermore, while upscaling motor concepts to the megawatt and gigawatt range, there is a risk that the additionally achieved material properties will not reach the high safety standards for the safety-related mounting flanges 3. However, due to the complex internal cooling, it is not possible to realize the rotor shaft 1 entirely from forged materials. The result would be a loss of power due to the lower cooling capacity. The increased weight and the significant reduction in the power density of the entire system would make the propulsion system unsustainable.

[0047] To keep the front mounting flange 3 scalable into the megawatt or gigawatt range for reasons of higher loads or larger dimensions, it can be produced, for example like today's engine discs, as can the two flange plates 16, from forged Ti64 as well. In this way it becomes possible to reliably transmit very high mechanical loads and, moreover, to use today's common design concepts for shaft attachments.

[0048] To reliably join the mounting flange to the additively manufactured coolant distribution body in its entirety or at least in some regions, these two parts can be joined by form-fit, press-fit or material bonding. A form-fit connection can be caused by a bayonet fit, a press-fit connection by a screw thread or a material bonding connection can be caused by welding, soldering or additive manufacturing.

[0049] One preferred variant of the material joining connection comprises, for example, using a processed mounting flange that is forged, heat treated and nearly finished in an additive manufacturing unit so that a complex coolant distributor can be additively deposited, for example in an SLM or EBM powder bed process, directly on an already partially pre-fabricated coolant channel that is still open upwards.

[0050] In this way, a "composite" shaft unit is formed, made for example from a forged Ti64 rotor mounting flange and for example an additively manufactured Ti64 coolant distributor, which cannot be fabricated in one piece by conventional methods.

[0051] The separate production of the rotor mounting flange by forging makes it possible to achieve safety class 1. By subsequent additive manufacturing by direct deposition on top, the complex structure of the coolant distributor can be realized in the same shaft. Such a part combines the main advantages of both shafts, unconventional: the established forging process is well tested for the mounting flange and, moreover, is more cost-effective for higher unit numbers. The production of the mounting flange in an additive process is not attractive for reasons of lower complexity. However, the creation of more complex functional coolant channels in structurally less loaded areas of the shaft, which is important for competitive advantage and economics, is possible by additive manufacturing. Since such structures generally cannot be produced in an optimized manner by conventional methods, additive manufacturing is here the means of choice, allowing the strength and functionality of thin complex structures to be realized. By using this manufacturing concept, in the case of small rotors in the 600 kW range, already advantages in terms of time in additive manufacturing (even with inadequate mechanical properties) can be realized, and while later upscaling, the hub can be calculated and designed with existing Ti64 forging design data, and very large structures with wall thicknesses that are economically unproducible and therefore require new structures can be realized. Therefore, only the structures with additive advantages are additively deposited. All the other parts are manufactured in a conventional way with high-value mechanical properties, which are also more economical.

[0052] Overall, the present invention makes it possible to provide cooling for a rotor arrangement whilst meeting mechanical requirements. [Explanation of symbols]

[0053] 1 rotor shaft 2 Electric motor 3 Mounting flange 4 first axial end 5 Mounting fixtures 6 Shaft 7 Second Axial End 8 Base Plate 9 Coolant distribution body 10 Longitudinal Axis 11 Coolant Channel 12 Rotor device 13 Aperture 14 Exterior 15 Coolant supply element 16 Flange plate 17 Rotor unit 18 Second tie rod 19 Coupling device 20 First tie rod 21 Assembly 22 Coolant Channel 23 Main Channel 24 Powder Bed 25 Additive Manufacturing Equipment S1, S2 method steps

Claims

1. In particular for aircraft engines, the rotor shaft (1) of an electric motor (2) has a forged mounting flange (3), the mounting flange (3) is provided to be attached to another shaft (6) to transmit force and / or torque, and has a first axial end (4) facing the other shaft (6), and a base plate (8) at a second axial end opposite to the first axial end (4), The device has a coolant dispenser (9) made by additive manufacturing in at least several regions, wherein the coolant dispenser (9) made by additive manufacturing is positioned on the base plate (8) of the mounting flange (3) made by forging so as to be radially centered. A rotor shaft (1) is characterized by having a rotor device (12) that radially surrounds the coolant distributor (9) manufactured by additive manufacturing and is joined to the base plate (8) of the mounting flange (3) which is forged by press-fitting at least.

2. The rotor shaft (1) according to claim 1, further characterized in that the mounting flange (3) is provided with a mounting device (5) for attaching the other shaft (6) to the first axial end (4).

3. The rotor shaft (1) according to claim 1 or 2, further characterized by comprising an external mounting element configured to join the mounting flange (3) to the other shaft (6) by press-fitting and / or shape fitting.

4. The rotor shaft (1) according to claim 1, further characterized in that the coolant distributor (9) formed by additive manufacturing of at least several regions has a coolant channel (11) that is fluidly connected to a channel opening (13) on the outer surface (14) of the coolant distributor (9) formed by additive manufacturing of at least several regions.

5. The rotor shaft (1) according to claim 1, further characterized in that the coolant distributor (9), which is additively manufactured in at least some areas, has an axially extending coolant supply element (15) at an end facing away from the mounting flange (3).

6. The rotor shaft (1) according to claim 4 or 5, further characterized in that at least some of the coolant channels (11) are in fluid connection with the cooling channels (22) of the mounting flange (3).

7. The rotor shaft (1) according to claim 1, further characterized in that the rotor device (12) is joined to the mounting flange (3) by a coupling device (19).

8. The rotor shaft (1) according to claim 7, further characterized in that the coupling device (19) has a first tie rod (20) fixed to the rotor device (12) and the mounting flange (3).

9. The rotor shaft (1) according to claim 1, further characterized in that the rotor device (12) comprises a rotor unit (17) axially positioned between two flange plates (16), and the two flange plates (16) are joined to each other by a second tie rod (18).

10. The rotor shaft (1) according to claim 1, further characterized in that the coolant distributor (9) is additionally applied to the mounting flange (3) by material joining.

11. In a rotor shaft (1) assembly (21) comprising a forged mounting flange (3), the mounting flange (3) is provided to be attached to another shaft (6) for transmitting force and / or torque, and has an axial end (4) facing the other shaft (6), and a base plate (8) at a second axial end (7) opposite the first axial end (4), The assembly (21) is characterized in that the rotor shaft (1) has a coolant distributor (9) formed by additive manufacturing in at least several regions, and the additively manufactured coolant distributor (9) is positioned on the base plate (8) of the mounting flange (3) formed by forging so that its radial center aligns with the base plate (8).

12. A method for manufacturing a rotor shaft (1) assembly (21), wherein a coolant distributor (9) is applied in at least several areas on a forged mounting flange (3) having a base plate (8) according to an additive manufacturing method, and the additively manufactured coolant distributor (9) is positioned on the base plate (8) of the forged mounting flange (3) such that it is radially centered.

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