Sealed cooled rotor, electric machine, motor vehicle and method for manufacturing a rotor

Abstract

The invention relates to a rotor (1) for driving an electric machine (2) of a motor vehicle (3), having a plurality of rotor disks (4), which each have a front side (5), a back side (6) and a through-passage (7) extending from the front side (5) to the back side (6), wherein the plurality of rotor disks (4) are joined to form a disk stack (8) having a rotor longitudinal axis (9), wherein the through-passages (7) of the rotor disks (4) of the disk stack (8) form a common cooling channel. A sealing device (11) is arranged in the region between two adjacent rotor disks (4) between the through-passage (7) of a rotor disk (4) and an adjacent outer disk edge (10), wherein the sealing device (11) only partially surrounds the through-passage. The invention also relates to an electric machine (2), a motor vehicle (3) and a method for producing a rotor (1).

Description

Technical Field

[0001] This invention relates to a rotor for an electric motor used to drive a motor vehicle. Furthermore, this invention relates to an electric motor having such a rotor, a motor vehicle having such an electric motor, and a method for manufacturing such a rotor. Background Technology

[0002] Motors are known in which the fluid-cooled rotor is designed as a stack of multiple rotor discs and surrounded by a stator. Such rotors are known, for example, from patent document DE 3 408 563 A1. Patent document DE 3 408563 A1 discloses a stamped sheet for manufacturing a stack of discs for a rotor. This stamped sheet has shape-fitting sections alternately designed as recesses and deformable sections, which are designed to fit multiple stamped sheets into the shape-fitting sections of adjacent stamped sheets within the stack. Due to the alternating arrangement of recesses and deformable sections, the recesses of the stamped sheet are at least partially covered by the deformable portions of adjacent stamped sheets. This prevents the formation of continuous recesses extending through the stack (or plate stack).

[0003] To deliver cooling fluid, the rotor discs have through-holes that form cooling channels within the disc stack. In this configuration, during operation, the cooling fluid may flow out of these channels under centrifugal force and into the air gap between the two rotor discs, which is constructed between the rotor and stator. Cooling fluids such as oil may cause undesirable braking torque within this relatively narrow air gap.

[0004] To eliminate this problem, it is known to seal the cooling channels, in which case the rotor discs are coated with a backing paint and bonded together. Alternatively, rotor cooling can be omitted, and only the stator can be cooled, where this centrifugal force does not occur.

[0005] Patent document DE 10 2004 035 602 A1 discloses an electric motor having a stator composed of multiple plates. The stator has a stator longitudinal axis and multiple cooling channels extending parallel to the stator longitudinal axis. From the cooling channels radially inward, the stator has multiple grooves constructed coaxially with the stator longitudinal axis. These grooves are formed during the stamping process of the plates and extend on both sides of the plates. The mating action of the grooves on adjacent plates forms a labyrinthine sealing device for sealing the cooling channels relative to the stator windings.

[0006] A stator for a rotary motor is known from patent document DE 10 2017 010 383 A1, which has a plurality of disc-shaped stator elements. These stator elements each have stamped portions and are stacked such that these stamped portions form cooling channels. A sealant, for example made of a polymer, is arranged around the stamped portions to seal the cooling channels. According to patent document JP 2006 / 136164 A1, the rotor discs of a rotor have cup-shaped formed portions in which such stamped portions are constructed. The rotor discs are stacked such that adjacent formed portions interlock and thus form cooling channels.

[0007] Known motors have the disadvantage of being very expensive to manufacture. In particular, coating processes, such as those using back paint or applied polymer sealants, require additional, targeted material input and are prone to damage during assembly. Grooves extending around the rotor's longitudinal axis cause significant deformation of the disc and thus require higher energy consumption during manufacturing. Furthermore, the lack of rotor cooling results in lower thermal regulation efficiency and consequently reduced load capacity. Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present invention is to eliminate or at least partially eliminate the aforementioned disadvantages in rotors used in electric motors. In particular, the technical problem to be solved by the present invention is to provide a rotor for an electric motor, an electric motor, a motor vehicle, and a method for manufacturing a rotor for an electric motor, wherein the rotor, electric motor, motor vehicle, and method avoid coolant seepage into the air gap between the rotor and the stator in a simple and inexpensive manner.

[0009] The aforementioned technical problem is solved by a rotor for a motor for driving a motor vehicle, a motor for driving a motor vehicle, a motor vehicle having an electric drive system for driving a motor vehicle, and a method for manufacturing a rotor for a motor for driving a motor vehicle. Here, the features and details described with respect to the rotor according to the invention also apply to the motor according to the invention, the motor vehicle according to the invention, and the method according to the invention, and vice versa; therefore, for the purposes of this disclosure, each individual aspect of the invention always references or may reference each other.

[0010] According to a first aspect of the invention, the technical problem is solved by a rotor for an electric motor. The rotor has a plurality of rotor discs, each having a front side, a back side, and a through-hole extending from the front side to the back side, wherein the rotor discs are assembled into a disc stack having a rotor longitudinal axis. These rotor discs are arranged in the disc stack such that the through-holes of the rotor discs in the disc stack form a common cooling channel. According to the invention, a sealing device is arranged between two adjacent rotor discs in the region between the through-hole of the rotor disc and the adjacent outer edge of the disc, wherein the sealing device only partially surrounds the through-hole.

[0011] The rotor disk is preferably made of plate, and particularly preferably manufactured during a stamping process. To prevent current from passing through, the front and / or back sides may have a coating, especially an electrically insulating coating. Alternatively, an intermediate disk, for example made of paper or the like, may be arranged between the two rotor disks. The disk edges define the boundaries of the rotor disk in the radial direction and extend in the circumferential direction and between the front and back sides.

[0012] The rotor disks are constructed with through-holes extending from the front to the back to form cooling channels for conveying a cooling medium, such as oil. The rotor disks in the stack are preferably arranged relative to each other such that these through-holes are coaxially arranged relative to each other to reduce flow resistance and turbulence in the cooling channels. The through-holes preferably have a circular or at least substantially circular cross-section. The through-holes are preferably arranged eccentrically on the rotor disks. Preferably, the through-holes are arranged closer to the disk edge than the disk center point. Furthermore, the rotor disks preferably have additional recesses, designed, for example, to accommodate permanent magnets, yokes, or the like. According to the invention, the inner walls of the cooling channels may also have a continuous, coolant-sealed, or coolant-resistant coating. Such a coating is preferably polymer-based.

[0013] The sealing device is arranged radially outward from the through-hole. Therefore, the sealing device is positioned between the through-hole and the adjacent outer edge of the rotor disk. Preferably, the sealing device has a sealing-forming structure constructed within the rotor disk. Within the scope of this invention, the sealing-forming structure is understood as a deformed area of ​​the rotor disk. Alternatively or additionally, the sealing device can also be arranged on the rotor disk via an additive manufacturing process.

[0014] Preferably, the sealing device has a semi-annular or sickle-shaped extension. The sealing device is preferably arranged coaxially with the through-hole. The sealing device preferably surrounds the through-hole radially outward at an angle between 90° and 180°, and particularly preferably between 120° and 150°. Preferably, no sealing device is provided at the through-hole in the remaining directions.

[0015] The sealing device is preferably formed by the cooperating action of two adjacent rotor discs. Therefore, it is preferred that one or two adjacent rotor discs have sealing elements, such as sealing molding structures, which form gaps in the disc stack and / or interlock with each other and thus constitute a sealing device or at least a part of a sealing device.

[0016] Compared to conventional rotors, the rotor for motors according to the present invention has the advantage of providing rotor cooling by simple means and inexpensive methods, wherein coolant penetration into the air gap between the rotor and stator is prevented by a sealing device. Here, the sealing device acts as a barrier in the direction of centrifugal force and thus specifically prevents undesirable radial outflow of coolant. The degree of rotor disc deformation can be reduced by partially surrounding the through-holes or coolant channels.

[0017] According to a preferred extended design of the invention, the sealing device can be specified in the rotor as having a stamped or pressed portion in the rotor disk. Therefore, the rotor disk has a sealing-forming structure designed as a stamped or pressed portion. Preferably, according to the invention, the sealing device is formed by the stamped or pressed portion of the rotor disk and the stamped or pressed portion of adjacent rotor disks. In this case, according to the invention, it is preferred that the sealing device is formed by the cooperative action of two stamped portions or two pressed portions, thereby reducing variations in the rotor disk. In the case of stamping, the front and back sides of the rotor disk are designed in reverse or at least substantially in reverse. In the case of pressing, the front and back sides have different degrees of deformation. The pressed portions are preferably designed such that adjacent pressed portions in the disk stack contact each other, preferably in such a way that the pressed portions deform due to the compression of the disk stack during rotor manufacturing. This has the advantage of further improving the sealing effect of the sealing device using simple means and in a cost-effective manner.

[0018] According to a preferred embodiment of the invention, a gap is constructed between adjacent rotor disks in the region of the sealing device, wherein the sealant of the sealing device is disposed in the gap. Within the scope of the invention, the gap is understood as a free space formed between two adjacent rotor disks. The sealant is disposed in the gap and thus occupies at least a partial area of ​​the gap. The gap is preferably completely filled with the sealant. Preferably, the sealant is cured such that it does not flow and is thus retained in the gap. The sealant is preferably flexible, especially elastic, and thus conforms to the contour of the gap. This has the advantage of further improving the sealing effect of the sealing device using simple means and in a cost-effective manner.

[0019] More preferably, the rotor disk has through holes in the region of the sealing device, wherein the sealant of the sealing device is disposed in the through holes. Preferably, in this case, gaps are additionally constructed between adjacent rotor disks in the region of the sealing device, wherein the sealant is disposed in the gaps. The through holes and / or gaps are preferably completely filled with sealant. The through holes of the stacked rotor disks are preferably fluidly coupled to each other by the removal of the sealant. More preferably, the through holes are arranged aligned with each other. The sealant is preferably introduced into the gaps through the through holes. The through holes preferably have a circular cross-section. Each rotor disk may also have multiple through holes. Furthermore, according to the invention, the through holes can be designed as elongated holes, especially curved elongated holes, and preferably extend along the sealing device. This has the advantage of improving the manufacture of the sealing device using simple means and in a cost-effective manner. The sealant is introduced into the gaps in a simple manner by injecting the sealant into the through holes.

[0020] In a particularly preferred embodiment of the invention, the sealing device may be designed in a cup shape on the front side of the rotor disk. Therefore, the sealing device is preferably designed as a cup or according to a cup design. Within the scope of the invention, the cup-shaped structure is understood to mean that the front side of the rotor disk has a recess extending towards the back side. This recess preferably extends only in a portion of the thickness of the rotor disk. Therefore, the depth of the cup is less than the thickness of the rotor disk. The cup-shaped structure preferably has an edge region designed as a sidewall and more preferably has a cup bottom. Alternatively, the cup-shaped structure may also be designed as a sphere. The cup-shaped structure is preferably manufactured by deformation, especially pressing. This has the advantage that the sealing device can be manufactured using simple means and in a cost-effective manner.

[0021] More preferably, the edge regions of the sealing device are designed to be inclined relative to the longitudinal axis of the rotor. Particularly preferably, multiple edge regions, especially opposite edge regions, are designed to be inclined relative to the longitudinal axis of the rotor. Therefore, the bottom of the cup preferably has a smaller area than the rim of the cup. In the process of assembling the rotor discs into a disc stack, this method can create contact areas with adjacent rotor discs in one or more edge regions of the cup, preferably continuous contact areas along the longitudinal extension of the sealing device, and more preferably, can achieve plastic deformation on at least one rotor disc. This has the advantage that an improved sealing effect of the sealing device can be achieved using simple means and in a cost-effective manner.

[0022] According to a preferred embodiment of the invention, the sealing device is designed as a protrusion on the back side of the rotor disk, wherein the orientation of one edge region of the sealing device on the back side relative to the rotor longitudinal axis is steeper than the orientation of one edge region of the sealing device on the front side relative to the rotor longitudinal axis. Preferably, the orientation of each edge region of the sealing device on the back side relative to the rotor longitudinal axis is steeper than the orientation of each edge region of the sealing device on the front side relative to the rotor longitudinal axis. Furthermore, it is preferred that the area of ​​the base of the protrusion is larger than the area of ​​the cup opening. Preferably, the protrusion has a height less than the depth of the cup. The protrusion and the cup are preferably designed such that the edge regions contact each other during the assembly of the rotor disks into a stack and, more preferably, deform during this process. This has the advantage of improving the sealing effect of the sealing device using simple means and inexpensive methods.

[0023] According to a second aspect of the invention, the technical problem is solved by an electric motor for driving a motor vehicle. The motor has a stator. According to the invention, the motor has a rotor according to the invention. The rotor is preferably arranged coaxially with the stator and rotatably supported relative to the stator. Preferably, the stator at least partially surrounds at least one section of the rotor circumferentially or circumferentially.

[0024] The motor according to the invention possesses all the advantages described regarding the rotor according to the first aspect of the invention. Therefore, compared to conventional motors, the motor according to the invention has the advantage of providing rotor cooling by simple means and inexpensive methods, wherein coolant penetration into the air gap between the rotor and stator is prevented by a sealing device. Here, the sealing device acts as a barrier in the direction of centrifugal force and thus specifically prevents undesirable radial outflow of coolant. The degree of rotor disc deformation can be reduced by partially surrounding the through-holes or coolant channels.

[0025] According to a third aspect of the invention, the aforementioned technical problem is solved by a motor vehicle. This motor vehicle has an electric drive system for driving the vehicle, wherein the electric drive system has an energy supply device for providing electrical energy. According to the invention, the electric drive system for driving the motor vehicle has an electric motor according to the invention. The motor vehicle preferably has power electronic equipment for operating the electric motor. The energy supply device preferably has a fuel cell for converting chemical energy into electrical energy and / or a traction battery for storing and releasing electrical energy. As a supplement to or alternative to the traction battery, according to the invention, additional energy storage devices, such as capacitors, may also be provided. Furthermore, the drive system preferably has a transmission mechanically coupled to, or at least capable of being coupled to, the electric motor.

[0026] The motor vehicle according to the invention possesses all the advantages described regarding the rotor according to the first aspect of the invention and the motor according to the second aspect of the invention. Therefore, compared to conventional motor vehicles, the motor vehicle according to the invention has the advantage of providing cooling of the motor rotor by simple means and inexpensive methods, wherein coolant penetration into the air gap between the rotor and stator is prevented by a sealing device. Here, the sealing device acts as a barrier in the direction of centrifugal force and thus specifically prevents undesirable radial outflow of coolant. The degree of rotor disc deformation can be reduced by partially surrounding the through-hole or coolant passage.

[0027] According to a fourth aspect of the present invention, the technical problem is solved by a method for manufacturing a rotor for an electric motor used to drive a motor vehicle. The method comprises the following steps:

[0028] - Provides a plurality of rotor disks, each rotor disk having a front side, a back side, a through-hole extending from the front side to the back side, and a sealing structure on the front side partially surrounding the through-hole in a region between the through-hole and the adjacent outer edge of the disk, wherein the sealing structure has a through-hole.

[0029] - The rotor disks are assembled into a disk stack, so that the through-parts form a common coolant channel, and the sealing and forming structures form gaps with the back of the adjacent rotor disks respectively;

[0030] - A flowable sealant is introduced into the through-hole so that the gap is filled with the sealant, and

[0031] - To cure the sealant.

[0032] When supplied, the rotor disks are preferably provided as semi-finished products or manufactured from sheet metal, particularly through a forming process. These rotor disks each have a front, a back, and a disk edge extending circumferentially between the front and back. Thus, the disk edge defines the boundary of the rotor disk in the radial direction. These rotor disks each have through-holes for conveying coolant for cooling the rotor. The through-holes are eccentrically arranged on the rotor disk. Preferably, the through-holes are arranged closer to the disk edge than the disk center point.

[0033] A sealing structure is constructed in the rotor disk in the region between the through-hole and the edge of the adjacent disk. The sealing structure only partially surrounds the through-hole. This means that such a sealing structure is not provided in the region around the through-hole, especially in the region pointing towards the center point of the rotor disk. The sealing structure has one or more through holes. The rotor disk preferably has magnetic slots for permanent magnets and yokes to increase magnetic flux.

[0034] The rotor disks are joined together such that the through-holes form a common coolant channel. This joining creates a disk stack composed of rotor disks. In this process, the rotor disks are preferably pressed against each other. Preferably, this arrangement is such that the through-holes are arranged coaxially with each other. Furthermore, the rotor disks are joined together such that the sealing structure forms a gap with the back surface of each adjacent rotor disk. Preferably, in this case, the edge region of the sealing structure of the rotor disk contacts the edge region of the sealing structure of the adjacent rotor disk, thereby causing local, especially plastic, deformation in the contact area. This improves the sealing of the gaps. Preferably, this arrangement is such that the through-holes are arranged coaxially with each other. Alternatively, it can be specified that the through-holes of adjacent rotor disks are arranged at different locations of the sealing structure, particularly preferably at opposite end regions of the sealing structure. Thus, the flow path of the sealant is designed as serpentine. This has the advantage that the distribution of the sealant in the gaps can be improved.

[0035] According to the present invention, permanent magnets may be arranged in the magnet slots of the rotor disk before or after assembly.

[0036] The sealant is introduced through a through-hole, preferably an external through-hole of the rotor disc, especially a through-hole of the rotor disc above the disc stack. Such an external through-hole can also be called an injection port. A blocking element, such as a post, plug, or the like, is preferably installed externally at the through-hole opposite to the injection port, thereby preventing or at least significantly reducing the outflow of the sealant. This improves the introduction of the sealant.

[0037] Finally, the sealant is cured in the through-holes and gaps, preferably by cooling, diffusion, etc. The sealant is preferably cured in a manner that prevents it from flowing further. The cured sealant is preferably deformable, and particularly preferably elastically deformable. This method produces a sealing device with a particularly advantageous sealing effect.

[0038] The method according to the invention possesses all the advantages described regarding the rotor according to the first aspect of the invention, the electric motor according to the second aspect of the invention, and the motor vehicle according to the third aspect of the invention. Therefore, the method according to the invention has the advantage of improving the manufacture of rotors with integrated cooling devices using simple means and in a cost-effective manner compared to conventional methods. Furthermore, the method according to the invention enables the manufacture of rotors for electric motors in which coolant is prevented from entering the air gap between the rotor and stator by a sealing device. Here, the sealing device acts in the direction of centrifugal force and thus specifically prevents undesirable radial outflow of coolant. The degree of rotor disc deformation can be reduced by partially surrounding the through-holes or coolant channels. Attached Figure Description

[0039] The rotor according to the invention, the motor according to the invention, the vehicle according to the invention, and the method according to the invention are described in detail below with the aid of the accompanying drawings. The drawings schematically illustrate, respectively:

[0040] Figure 1 A partial top view of the front of a rotor disk according to a preferred embodiment of the present invention is shown.

[0041] Figure 2 A cross-sectional view of a rotor stack according to a preferred first embodiment of the present invention is shown.

[0042] Figure 3 A cross-sectional view of the rotor disc stack according to a preferred second embodiment of the present invention is shown.

[0043] Figure 4 A cross-sectional view of the rotor disc stack according to a preferred third embodiment of the present invention is shown.

[0044] Figure 5 A cross-sectional view is shown in the first state when implementing the method according to the invention.

[0045] Figure 6 A cross-sectional view is shown in the second state when implementing the method according to the invention.

[0046] Figure 7 A cross-sectional view showing a third state when implementing the method according to the invention, and

[0047] Figure 8 A side view of a preferred embodiment of a motor vehicle according to the present invention is shown.

[0048] exist Figures 1 to 8 In the figures, elements with the same function and mode of operation are respectively given the same reference numerals. Detailed Implementation

[0049] exist Figure 1 The top view shows a partial front view 5 of the rotor disk 4 according to a preferred embodiment of the present invention. A plurality of through-holes 7 are constructed in the rotor disk 4 to form cooling channels for conveying coolant. A sealing forming structure 19, designed as a pressing portion, is constructed between the through-holes 7 and the disk edge 10 of the rotor disk 4 to form a sealing device 11 (see [reference]). Figure 2 In addition, the rotor disk 4 has multiple magnet slots 20 in which permanent magnets 21 are arranged. The rotor disk 4 is designed around the rotor longitudinal axis 9.

[0050] Figure 2The disk stack 8 of the rotor 1 according to a preferred first embodiment of the invention is schematically shown in cross-sectional view. The disk stack 8 has two rotor disks 4 arranged in a stacked manner. According to the invention, the disk stack 8 may have additional rotor disks 4, which are also arranged in a stacked manner. Each rotor disk 4 has a stamped sealing structure 19, which is designed as a cup on the front side 5 and as a protrusion on the back side 6 of the rotor disk 4. The edge region 15 of the sealing structure 19 is designed obliquely relative to the longitudinal axis 9 of the rotor. The sealing structures 19 of adjacent rotor disks 4 are in contact with each other and thus form a sealing device 11.

[0051] exist Figure 3 The cross-sectional view schematically shows the disc stack 8 of the rotor 1 according to a preferred second embodiment of the present invention. The disc stack 8 according to the preferred second embodiment of the present invention and... Figure 2 The difference in the disc stack 8 shown according to the preferred first embodiment of the invention lies in the design of the sealing molding structure 19, which is manufactured by pressing. The inclination of the edge region 15 of the sealing molding structure 19 on the front side 5 relative to the rotor longitudinal axis 9 is smaller than that of the edge region 15 of the sealing molding structure 19 on the back side 6 relative to the rotor longitudinal axis 9. Therefore, the edge regions 15 of adjacent rotor discs 4 contact each other in such a way that a gap 12 is formed between the rotor discs 4 in the region between the edge regions 15. This creates a sealing device 11. According to the invention, the gap 12 can be specified using a sealant 13 of the sealing device 11 (see...). Figure 7 The sealant 13 is applied to one or both rotor disks 4 before they are assembled together to improve the sealing effect. In this embodiment, it is preferred that the sealant 13 is applied to one or both rotor disks 4 before they are assembled together.

[0052] Figure 4 A cross-sectional view schematically shows the disk stack 8 of the rotor 1 according to a preferred third embodiment of the present invention. The disk stack 8 according to the preferred third embodiment of the present invention is related to... Figure 3 The disc stack 8 shown in the preferred second embodiment according to the invention differs in that it has an additional through-hole 14, which is constructed in the sealing forming structure 19 and extends from the front side 5 to the back side 6. This allows the sealant 13 to be introduced after the disc stack 8 is formed. The sealant 13 is not shown.

[0053] exist Figure 5 The cross-sectional view schematically illustrates a first state in which the method according to the invention is implemented. In this first state, a plurality of rotor disks 4 are provided, each having a front side 5 and a back side 6. The rotor disks 4 are configured according to... Figure 4 The rotor disk 4 design is shown.

[0054] Figure 6A cross-sectional view schematically illustrates a second state in which the method according to the invention is implemented. In this second state, the rotor disks 4 have been assembled into a disk stack 8 and pressed against each other. A barrier 22 for blocking the flow of sealant 13 is arranged on the back surface 6 of the lower rotor disk 4.

[0055] exist Figure 7 The cross-sectional view schematically shows a third state in which the method according to the invention is implemented. In this third state, the sealant 13 has been injected into the upper through-hole 14 such that all through-holes 14 and gaps 12 are filled with the sealant 13. The sealant 13 is in a cured state and the blocking member 22 has been removed. Thus, the rotor 1 is manufactured.

[0056] Figure 8 A preferred embodiment of a motor vehicle 3 according to the invention is schematically shown in a side view. The motor vehicle 3 has an electric drive system 17, which includes an energy supply device 18 designed as a traction battery, a motor 2 according to the invention, power electronic equipment 23 for operating the motor 2, and a transmission 24 for changing the speed of the motor 2. The motor 2 has a stator 16 and a rotor 1 according to the invention.

[0057] List of reference numerals

[0058] 1. Rotor

[0059] 2 motors

[0060] 3 Motor vehicles

[0061] 4. Rotor disc

[0062] 5. Front

[0063] 6. Back

[0064] 7 Pass-through part

[0065] 8 stacked discs

[0066] 9. Rotor longitudinal axis

[0067] 10 plate edges

[0068] 11 Sealing device

[0069] 12 gaps

[0070] 13. Sealant

[0071] 14 Through holes

[0072] 15. Edge Area

[0073] 16 stators

[0074] 17 Drive System

[0075] 18. Energy supply device

[0076] 19 Sealed molding structure

[0077] 20 Magnet slots

[0078] 21 permanent magnet

[0079] 22. Blocking components

[0080] 23 Power Electronic Equipment

[0081] 24 Gearbox

Claims

1. A rotor (1) for a motor (2) for driving a motor vehicle (3) having a plurality of rotor discs (4), each of the plurality of rotor discs having a front side (5), a back side (6), and a through portion (7) extending from the front side (5) to the back side (6), wherein, The plurality of rotor disks (4) are assembled into a disk stack (8) with a rotor longitudinal axis (9), wherein the through portions (7) of the rotor disks (4) of the disk stack (8) form a common cooling channel. The feature is that a sealing device (11) is arranged between two adjacent rotor disks (4) in the region between the through portion (7) of the rotor disk (4) and the adjacent outer disk edge (10), wherein the sealing device (11) only partially surrounds the through portion. In the region of the sealing device (11), a gap (12) is formed between adjacent rotor discs (4), and the sealant (13) of the sealing device (11) is arranged in the gap (12). The sealing device (11) has a sealing forming structure (19) constructed in at least one of the adjacent rotor disks (4) before the rotor disks are assembled into a disk stack, wherein the gap (12) is formed by the sealing forming structure (19) after the rotor disks are assembled into a disk stack.

2. The rotor (1) according to claim 1, characterized in that, The sealing device (11) has a punching or pressing part in the rotor disk (4).

3. The rotor (1) according to any one of the preceding claims, characterized in that, The rotor disk (4) has a through hole (14) in the area of ​​the sealing device (11), wherein the sealant (13) of the sealing device (11) is arranged in the through hole (14).

4. The rotor (1) according to at least one of the preceding claims, characterized in that, The sealing device (11) is designed in a cup shape on the front (5) of the rotor disk (4).

5. The rotor (1) according to claim 4, characterized in that, The edge region (15) of the sealing device (11) is designed to be inclined relative to the longitudinal axis (9) of the rotor.

6. The rotor (1) according to claim 5, characterized in that, The sealing device (11) is designed as a protrusion on the back side (6) of the rotor disk (4), wherein the edge region (15) of the sealing device (11) on the back side (6) is oriented with respect to the longitudinal axis (9) of the rotor more steeply than the edge region (15) of the sealing device (11) on the front side (5) is oriented with respect to the longitudinal axis (9) of the rotor.

7. An electric motor (2) for driving a motor vehicle (3), having a stator (16), characterized in that, The motor (2) has a rotor (1) according to any one of the preceding claims.

8. A motor vehicle (3) having an electric drive system (17) for driving the motor vehicle (3), wherein, The electric drive system (17) has an energy supply device (18) for providing electrical energy, characterized in that the electric drive system (17) has a motor (2) for driving a motor vehicle (3) according to claim 7.

9. A method for manufacturing a rotor (1) of an electric motor (2) for driving a motor vehicle (3), comprising the following steps: - Provides a plurality of rotor disks (4), each rotor disk having a front side (5), a back side (6), a through portion (7) extending from the front side (5) to the back side (6), and a sealing structure (19) on the front side (5) partially surrounding the through portion (7) in the region between the through portion (7) and an adjacent outer disk edge (10), wherein, The sealing structure (19) has a through hole (14), - The rotor disks (4) are assembled into a disk stack (8) such that the through-parts (7) form a common coolant channel, and the sealing structure (19) forms a gap (12) with the back surface (6) of the adjacent rotor disks (4). - A flowable sealant (13) is introduced into the through hole (14) so ​​that the gap (12) is filled with the sealant (13), and - To cure the sealant (13).

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