Electromechanics

Abstract

1. An electric machine comprising a machine housing (2), a rotor (5) with a rotor carrier (6) accommodated in the machine housing (2), and coupling means for coupling the rotor carrier (6) to a shaft, in particular a crankshaft (16), of an internal combustion engine, in which the rotor carrier (6) is rotatably supported on one side in the machine housing (2) and coupling means provided on the other side include at least one first annular disk (18, 28) releasably connectable to the rotor carrier (6), via which the rotor carrier (6) can be coupled to the crankshaft (16).

Description

Technical Field

[0001] The present invention relates to an electromechanical machine including a machine housing, a rotor provided with a rotor carrier and accommodated in the machine housing, and coupling means for coupling the rotor carrier to a shaft, in particular the crankshaft of an internal combustion engine.

Background Art

[0002] For example, in automotive applications, it may be necessary to couple an electric machine to a shaft, such as the crankshaft of an internal combustion engine. This is particularly true in series - driven hybrid vehicles, where two electric machines arranged coaxially, or two electric machines offset from each other and not coupled or connected to each other, are provided as a compact drive unit. One of the two electric machines is coupled to the crankshaft of the internal combustion engine and functions as a generator to generate the electric power required for the operation of the second electric machine. In this case, the second electric machine functions as a motor and is coupled to a transmission that is coupled to the driven wheels or the driven shaft or axle. The electric power is either directly supplied to the drive machine or temporarily stored in an accumulator and taken out as needed. Such a device is described, for example, in International Publication No. WO 2019 / 101264 (A1). For example, in such a configuration, in this case, it is necessary to directly couple the rotor of the first electric machine to the crankshaft. This coupling is achieved by shaping the rotor carrier such that it is at least somewhat exposed at the entrance of the machine housing and can be screwed to the crankshaft via an inward - facing radial flange. The assembly of the electric machine, or the assembly of a package including two electric machines and a transmission in the case of series drive, is carried out by the manufacturer during the final assembly process. It is necessary to remove the rotor of the (first) electric machine from the machine housing and assemble it, i.e., screw it, individually to the crankshaft because a rotor installed in any other way would not be accessible in a screwing - capable manner. In a further assembly process, it is necessary to install the electric machine and press the stator onto the rotor fixed to the crankshaft side. This is time - consuming and requires accurate and careful assembly so that the mechanical parts moving relative to each other are not damaged. Furthermore, attention must be paid to accurate positioning so that the stator is positioned at the center of the rotor. After this assembly, it is necessary for the manufacturer to "teach" the electric machine.This is because generally, a machine is equipped with a rotor position sensor, and through the rotor position sensor, the rotational position of the rotor can be detected accurately and with high resolution. This rotor position sensor includes a transmitter component, usually an annular disk, coupled to the rotor carrier on which the rotor laminated core is seated, and a sensor that is fixedly arranged at a position, such as in the machine housing, to detect the position of the transmitter disk. In order to remove and individually attach the rotor together with the transmitter annular disk, after final assembly, the position of the transmitter annular disk relative to the sensor may have changed compared to the initial attachment, which thus requires teaching.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The problem of the present invention is to provide an improved electric machine compared to conventional electric machines.

Means for Solving the Problems

[0004] To solve this problem, according to the present invention, in an electric machine of the type described at the beginning, the rotor carrier is rotatably supported on one side of the machine housing, and the coupling means provided on the other side includes at least one first annular disk that can be detachably connected to the rotor carrier, and through the first annular disk, the rotor carrier is provided to be connectable to the crankshaft.

[0005] According to the present invention, the rotor carrier is rotatably supported in the machine housing via a corresponding bearing device, usually a rolling bearing. This bearing surface is located further inside the machine housing on one side of the rotor carrier, while on the other side, a fixing surface of the rotor carrier with respect to the crankshaft is provided. To achieve this fixation, corresponding coupling means are provided, which, according to the present invention, include at least one first annular disk that can be detachably connected to the rotor carrier, and via the first annular disk, the rotor carrier can be coupled to the crankshaft. This means that this coupling surface is a detachable coupling, i.e., a coupling that can be closed only when necessary, and through this coupling, the rotor carrier is coupled to the crankshaft. This particularly advantageously enables, during the assembly process, the detachable annular disk to be first coupled to the crankshaft, and this coupling is usually performed by axially screwing the annular disk onto the crankshaft. The annular disk extends radially from the crankshaft. During the assembly process, the electromechanical machine is attached, which includes a firmly assembled and supported rotor. In the final assembly position, the rotor carrier is directly or indirectly coupled to the annular disk fixed to the crankshaft side. This can also be done without problems via axial screwing here, but it can be done from the opposite side compared to the axial screwing on the crankshaft side because the annular disk fixed to the crankshaft side axially overlaps with the corresponding fixing part assigned to or coupled to the rotor carrier, so that the corresponding screw connection part can be set there.

[0006] The electromechanical device according to the present invention is much easier to assemble as a single machine or as part of a compact mechanical device including two electromechanical devices, because the rotor can be pulled out and does not need to be assembled individually, and then, during the final assembly process, there is no need to reposition the stator relative to the rotor. Also, it becomes unnecessary for the manufacturer to teach the rotor position sensor device. This is because once the stator-rotor device no longer changes during the manufacturing process of the electromechanical device, this state will not change, so this teaching can be performed after completion.

[0007] Regarding the connection between the rotor carrier and the first annular disk that can be fixed to the crankshaft side, two deformation forms are conceivable. According to the first alternative form of the present invention, the annular disk may be more flexible in the axial direction and more rigid in the radial direction, and can be detachably arranged on the rotor carrier and may be directly connectable to the crankshaft. The annular disk itself is a disk that is somewhat flexible in the axial direction but more rigid in the radial direction compared thereto, and this disk may also be called a flex plate or a flexible disk. This annular disk is detachably arranged on the rotor carrier. During the assembly process of the electromechanical device, the annular disk is first removed from the rotor carrier and fixed to the crankshaft. During the assembly process of the electromechanical device, the rotor carrier having corresponding connecting portions is axially moved relative to the annular disk, and they are in a face-to-face state, so that they can be detachably fixed to each other, for example, via corresponding screw connecting portions. Therefore, in this configuration, the rotor carrier is directly connected to the crankshaft via this more flexible annular disk or flex plate.

[0008] In an alternative configuration, a second annular disk that is more flexible in the axial direction and more rigid in the radial direction is fixedly coupled to the rotor carrier, and a first annular disk is detachably disposed on the rotor carrier, and the first annular disk can be provided to be connectable to the crankshaft. That is, in this configuration of the present invention, a two-disk connection between the rotor carrier and the crankshaft is used. The second annular disk fixedly disposed on the rotor carrier, that is, the second annular disk that cannot be detached during the assembly process, is also, in this case, an annular disk that is more flexible in the axial direction and more rigid in the radial direction, that is, a flex plate or a flex disk, and this annular disk is further detachably coupled to the first annular disk on its side. During the assembly process, this first annular disk can be detached again from this second annular disk and can be fixedly secured to the crankshaft individually, that is, can be screwed axially again. During the assembly process of the electromechanical machine, the second annular disk fixedly disposed on the rotor carrier side is guided by the first annular disk fixed on the crankshaft side, so that these two annular disks can be screwed axially from the opposite side.

[0009] The two deformation forms each include an annular disk, i.e., a flexplate, which is more flexible axially and more rigid radially. During operation, the crankshaft may move slightly axially in addition to its rotational movement, which appears as wobbling of the threaded surface of the annular disk on the crankshaft. These movements need to be corrected by the connection to the rotor. This enables, in particular advantageously, the more flexible annular disk or flexplate to be combined, in particular, with bearings with a slight play, where the rotor carrier is rotatably supported at the other end of the machine housing. This enables the device to correct or follow the movements of the crankshaft. The play of the bearing needs to be designed such that the rotor can move slightly in response to the axial movement of the crankshaft, in which case the rotor and the stator must not come into contact. In this case, it is advantageous if the axial distance between the crankshaft or its coupling surface and the rolling bearing of the rotor carrier is as large as possible, as the axial movement within the bearing is reduced and there is no need to make the play of the bearing unnecessarily large.

[0010] The separable first annular disk is detachably and properly coupled to the rotor carrier via a plurality of screw joints. For this purpose, corresponding screw holes may be formed in the rotor carrier, or holes into which screw bushings are inserted may be formed. If a two-disk solution is used, the fixed second annular disk is properly fixedly coupled to the rotor carrier via a plurality of rivet joints, while the first annular disk is detachably coupled to the second annular disk via a plurality of screw joints. In this case, either screw holes or holes for screw bushings may also be provided in the second annular disk, i.e., the flex disk. Simple holes for receiving the rivets are provided in the rotor carrier and the second annular disk for performing the rivet joints.

[0011] As described above, the rotor carrier is coupled on both sides. On the side within the housing, it is fixed or supported on the housing side via rolling bearings, such as single-row or multi-row ball bearings, or two angular ball bearings. The coupling to the crankshaft is provided on the other open side. According to the present invention, in order to form these two specific joining points on the rotor carrier, the rotor carrier has a first cylindrical axial flange, and a rolling bearing for supporting the rotor carrier against the machine housing is accommodated in the cylindrical axial flange. A first radial flange extending radially outward is connected to the rolling bearing, and a second cylindrical axial flange on which the rotor laminated core is seated is connected to the radial flange. A second radial flange extending radially outward is connected to the second axial flange, and it is provided that an annular disk, whether a separable annular disk or a fixed annular disk, is fixed to the second radial flange. Therefore, a corresponding stepped shape is provided, and this stepped shape forms corresponding flanges to provide bearing seats for the rolling bearing and the laminated core, as well as a joining point for the annular disk. Alternatively, the annular disk may be fixed to the first radial flange, that is, in this embodiment, the second radial flange is not provided.

[0012] In this case, a sealing element may be arranged between the rolling bearing and the first radial flange to seal the gap between the first axial flange and the machine housing. In this case, in a series arrangement of two electric machines where a transmission is connected to the second electric machine, the rolling bearing may be arranged in the wet chamber of the transmission, i.e., lubricated via the transmission, while the sealing element seals this wet chamber against the machine chamber of the first electric machine. Alternatively, it is conceivable that the rolling bearing is arranged adjacent to the first radial flange and the sealing element is arranged adjacent to the rolling bearing to seal the gap between the first axial flange and the machine housing. Thus, in this case, the rolling bearing is arranged in the machine chamber of the first electric machine, i.e., the dry chamber, which is further sealed against the wet chamber of the transmission via the sealing element. In this case, it would be necessary for the rolling bearing to be filled with grease. The sealing element is, for example, a radial shaft seal ring or the like.

[0013] Furthermore, a rotor position sensor may be provided which is positionally fixed, in particular arranged in the machine housing, and a transmitter annular disk arranged on the rotor carrier, in particular on the first radial flange, is assigned to the rotor position sensor. The rotor position sensor and the transmitter disk form a rotor position sensor device.

[0014] In addition to the electric machine itself, the present invention further relates to an electric machine device including a first electric machine of the above-described type and a second electric machine, wherein the second electric machine includes a transmission drivingly coupled to the second electric machine. This machine device is in a series arrangement including two series-connected electric machines, wherein the first electric machine is a machine designed according to the present invention and is arranged on the crankshaft of the internal combustion engine via a corresponding joint device with a separable annular disk. This electric machine is mechanically driven as a generator via the combustion force to supply the electric power required for the operation of the second electric machine, and this electric power can of course also be stored or buffered in a corresponding accumulator device. The second electric machine is coupled to the transmission and is coupled to a wheel or a driven axle driven via the transmission. This machine device is a compactly made unit that can be assembled as one part and can be easily coupled to the crankshaft of the internal combustion engine as a result of the configuration of the first machine provided by the present invention. Therefore, the machine device is a drive unit for the drive train of an electrically drivable vehicle. Such a machine device or drive unit is sometimes also called a two-electric machine transmission or a hybrid transmission, enabling a particularly compact design of the drive train for a hybrid vehicle.

[0015] Furthermore, the present invention relates to a method of assembling the above-described electric machine or the first electric machine of the above-described electric machine device on the crankshaft of the internal combustion engine. In this case, according to the present invention, the first annular disk is detached from the rotor carrier, or the second annular disk is detached from the first annular disk, coupled to the crankshaft, and then the electric machine is positioned and the rotor carrier is coupled to the first annular disk, or the first annular disk is coupled to the second annular disk.

[0016] Hereinafter, the present invention will be described using embodiments with reference to the drawings. The drawings are schematic diagrams.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

MODE FOR CARRYING OUT THE INVENTION

[0018] FIG. 1 shows a partial view of an electromechanical machine 1 according to the invention, including a machine housing 2 in which a stator-rotor device 3 is provided. The electromechanical machine 1 includes a stator 4 fixedly arranged in the machine housing 2, which can be cooled, and for which cooling fluid can circulate through cooling channels 33. Further, a rotor 5 is provided, which includes a rotor carrier 6 and a rotor laminated core 7 arranged on the rotor carrier 6. The rotor carrier 6 includes a first cylindrical axial flange 8 that functions as a bearing seat for a rolling bearing 9, through which the rotor carrier 6 and the entire rotor 5 together with the rotor carrier 6 are rotatably supported in a corresponding bearing seat 10 of the machine housing 2. The machine chamber in which the stator-rotor device 3 is provided is sealed against a wet chamber 13 via a seal element 11 arranged between the rolling bearing 9 and a first radial flange 12 connected to the first axial flange 8. In the wet chamber 13, a transmission (not shown in detail here) is connected to a second electromechanical machine (likewise not shown in detail here). Thus, the electromechanical machine 1 is part of a mechanical device or drive unit for a drive train of an electrically drivable vehicle and operates as a generator, while the second electromechanical machine operates as an electric motor and drives via the transmission.

[0019] The first radially extending radial flange transitions into a second axially extending axial flange 14, on which the rotor laminated core 7 is seated. A second radial flange 15 protruding towards the outside in the radial direction is connected to this second axial flange. This radial flange 15 has the function of a joint point for connecting the rotor carrier 6 and the crankshaft 16 of the internal combustion engine. For this purpose, the second radial flange 15 has a plurality of threaded holes 17 arranged at equal intervals on the circumference. An (first) annular disk 18 having corresponding holes 19 abuts against the second radial flange 15, and through the corresponding holes 19, the annular disk 18 is detachably fixed to the second radial flange 15. This fixing is performed by corresponding screw joints 20 screwed into the threaded holes 17. Accordingly, a detachable joint point that allows the annular disk 18 to be detached from the rotor carrier 6 is provided.

[0020] The annular disk 18 is a flex plate or a flex disk that has a certain degree of elasticity in the axial direction but is more rigid in the radial direction. Through this annular disk 18 that is slightly elastic in the quasi-axial direction, it is possible to absorb the axial movement of the crankshaft 16 that may occur during operation. These axial movements can also be absorbed by the play of the rolling bearing 9 in some cases, and also by the slight radial movement that may result from the movement of the crankshaft or the wobbling of the annular disk 18.

[0021] The annular disk 18 itself is axially detachably screwed to the crankshaft 16 through corresponding screw joints 21, and in this case, a cover disk 22 can also be interposed. This means that a second detachable joint point of the annular disk 18 is provided here.

[0022] During the assembly process of the electric machine 1 or a mechanical device that can be part of it, the annular disk 18 is detached from the rotor carrier 6 by loosening the screw connection 20 after the electric machine 1 or the mechanical device has been completed by the vehicle manufacturer. Subsequently, the annular disk 18 is axially screwed to the crankshaft 16 via the screw connection 21. Thereafter, the electric machine 1 or the mechanical device is positioned such that the second radial flange 15 abuts against the annular disk 18 and the hole 19 is aligned with the threaded hole 17. For this purpose, the rotor carrier 6 may be provided with centering elements, such as centering points, which engage in the centering holes of the annular disk 18 to adjust the centering when pressed against each other. At this time, the screw connection 20 is screwed, which can be done without problems since the screw connection 20 is set on the opposite side of the screw connection 21 of the crankshaft fixing part. Here, an axially arranged screw connection 20 is shown, but the screw can also be arranged at an angle or radially in a corresponding configuration of the rotor carrier according to the installation space conditions of the internal combustion engine.

[0023] The electric machine 1 further has a rotor position sensor device 23, which includes a rotor position sensor 24 fixedly positioned, for example, in a machine housing, and a transmitter 25 arranged here on the first radial flange 12. During the manufacturing process of the electric machine 1, all mechanical components, that is, in particular the rotor-stator device 3 and the rotor position sensor device 23, are assembled. During the subsequent overall assembly, this device does not change. This makes it possible to teach the rotor position sensor device 23 on the side of the electric machine manufacturer. On the side of the vehicle manufacturer installing the electric machine, only the connection to the crankshaft needs to be made, and no other additional work is required.

[0024] FIG. 2 shows a second configuration of the electric machine 1 according to the invention, the basic structure of which is the same as that of FIG. 1. Here, only the rotor carrier 6 and its connection to the crankshaft 16 are configured slightly differently.

[0025] The rotor carrier 6 also has here a first axial flange 8, a first radial flange 12, and a second axial flange 14. In the illustrated example, the second annular disk 26 is inseparably attached to the rotor carrier 6, and for this purpose, corresponding rivet joints 27 are provided that penetrate the corresponding holes 28, 29 of the radial flange 12 and the second annular disk 26. This second annular disk 26 is also configured as a flex disk, that is, it is slightly flexible axially rather than radially, so that it can absorb any occurring axial movement of the crankshaft without problems.

[0026] To couple the rotor carrier 6 to the crankshaft 16, a first annular disk 28 is used, which is screwed axially onto the crankshaft 16 via a screw joint 34 on the one hand and axially coupled to the second annular disk 26 via a screw joint 30 on the other hand. For this purpose, the second annular disk 26 further has a corresponding screw hole 31 into which the screw joint 30 is screwed. This rivet surface is radially outside of the screwing surface of the annular disk 26 onto the radial flange 12.

[0027] During the assembly process, here the first annular disk 28 is detached from the second annular disk 26 by loosening the screw joint 30, and the second annular disk 26 is fixed as described above and in this case is inseparably attached to the rotor carrier 6 during the assembly process. As a separate part, the first annular disk 28 is further screwed axially onto the crankshaft 16 via the screw joint 34. Subsequently, the electromechanical machine 1 is positioned such that the radial outer edge region of the second annular disk 26 overlaps the first annular disk 28 and the corresponding holes 32 overlap the respective screw holes 31 of the second annular disk 26. Subsequently, the screw joint 30 is set and also screwed axially from the opposite side compared to the screw joint 29 here.

[0028] Therefore, with this configuration, even very simple assembly is possible. In particular, as described above, the rotor 5 itself can no longer be disassembled.

Description of Reference Numerals

[0029] 1 Machine 2 Machine housing 3 Rotor-stator device 4 Stator 5 Rotor 6 Rotor carrier 7 Rotor laminated core 8 Axial flange 9 Rolling bearing 10 Bearing seat 11 Seal element 12 Radial flange 13 Wet chamber 14 Axial flange 15 Radial flange 16 Crankshaft 17 Threaded hole 18 Annular disk 19 Hole 20 Threaded joint 21 Threaded joint 22 Cover disk 23 Rotor position sensor device 24 Rotor position sensor 25 Transmitter annular disk 26 Annular disk 27 Rivet joint 28 Annular disk 29 Threaded joint 30 Threaded joint 31 Threaded hole 32 Hole 33 Coolant channel 34 Threaded joint

Claims

1. An electromechanical machine for a drive train of an electrically drivable motor vehicle, comprising a machine housing (2), a rotor (5) provided with a rotor carrier (6) and received in the machine housing (2), and coupling means for coupling the rotor carrier (6) to a crankshaft (16) of an internal combustion engine, wherein the rotor carrier (6) extends axially from the transmission side of the rotor (5) towards the internal combustion engine side, the rotor carrier (6) is rotatably supported in the machine housing (2) at an axial end on the transmission side of the rotor (5), the coupling means for coupling the rotor carrier (6) to the crankshaft (16) is provided at an axial end on the internal combustion engine side of the rotor (5), the coupling means provided at the axial end on the internal combustion engine side of the rotor (5) includes at least one first annular disk (18, 28) that can be detachably connected to the rotor carrier (6), and via the first annular disk (18, 28), the rotor carrier (6) can be coupled to the crankshaft (16), the first annular disk (18) is more flexible axially and more rigid radially, is detachably arranged on the rotor carrier (6), and can be directly coupled to the crankshaft (16). An electromechanical machine characterized by this.

2. An electromechanical machine for a drive train of an electrically drivable motor vehicle, comprising a machine housing (2), a rotor (5) provided with a rotor carrier (6) and received in the machine housing (2), and coupling means for coupling the rotor carrier (6) to a crankshaft (16) of an internal combustion engine, wherein the rotor carrier (6) extends axially from the transmission side of the rotor (5) towards the internal combustion engine side, the rotor carrier (6) is rotatably supported in the machine housing (2) at an axial end on the transmission side of the rotor (5), the coupling means for coupling the rotor carrier (6) to the crankshaft (16) is provided at an axial end on the internal combustion engine side of the rotor (5), The coupling means provided at the axially end portion of the rotor (5) on the internal combustion engine side includes at least one first annular disk (18, 28) that can be detachably connected to the rotor carrier (6). Through the first annular disk (18, 28), the rotor carrier (6) can be coupled to the crankshaft (16). A second annular disk (26) that is more flexible in the axial direction and more rigid in the radial direction is fixedly connected to the rotor carrier (6). The first annular disk (28) is detachably arranged on the rotor carrier (6), and the first annular disk (28) can be coupled to the crankshaft (16). The detachable first annular disk (18) is detachably fixed to the rotor carrier (6) via a plurality of screw connection parts (20), or the fixed second annular disk (26) is fixedly connected to the rotor carrier (6) via a plurality of rivet connection parts (27). The first annular disk (28) is detachably coupled to the second annular disk (26) via a plurality of screw connection parts (30). The characterized electromechanical device.

3. An electromechanical device for a drive train of an electrically drivable vehicle, comprising a mechanical housing (2), a rotor (5) provided with a rotor carrier (6) accommodated in the mechanical housing (2), and coupling means for coupling the rotor carrier (6) to a crankshaft (16) of an internal combustion engine. In the electromechanical device, the rotor carrier (6) extends axially from the transmission side of the rotor (5) to the internal combustion engine side. The rotor carrier (6) is rotatably supported by the mechanical housing (2) at the axially end portion of the rotor (5) on the transmission side. The coupling means for coupling the rotor carrier (6) to the crankshaft (16) is provided at the axially end portion of the rotor (5) on the internal combustion engine side. The coupling means provided at the axially end portion of the rotor (5) on the internal combustion engine side includes at least one first annular disk (18, 28) that can be detachably connected to the rotor carrier (6). Through the first annular disk (18, 28), the rotor carrier (6) can be coupled to the crankshaft (16). The rotor carrier (6) has a first cylindrical axial flange (8), and a rolling bearing (9) for supporting the rotor carrier (6) with respect to the machine housing (2) is accommodated in the first cylindrical axial flange (8). A first radial flange (12) extending radially outward is connected to the rolling bearing (9), and a cylindrical second axial flange (14) on which the rotor laminated core (7) is seated is connected to the first radial flange (12). A second radial flange (15) extending radially outward to which a second annular disk (26) is fixed is connected to the second axial flange (14), or the second annular disk (26) is fixed to the first radial flange (12). An electric machine, characterized in that it is either one of them.

4. A seal element (11) is axially arranged between the rolling bearing (9) and the first radial flange (12), and the seal element (11) seals a gap between the first cylindrical axial flange (8) and the machine housing (2), or the rolling bearing (9) is arranged adjacent to the first radial flange (12), and the seal element (11) is arranged adjacent to the rolling bearing (9), and seals a gap between the first cylindrical axial flange (8) and the machine housing (2). The electric machine according to claim 3, characterized in that.

5. An electric machine for a drive train of an electrically drivable motor vehicle, comprising a machine housing (2), a rotor (5) comprising a rotor carrier (6) accommodated in the machine housing (2), and coupling means for coupling the rotor carrier (6) to a crankshaft (16) of an internal combustion engine. In the electric machine, the rotor carrier (6) extends axially from the transmission side to the internal combustion engine side of the rotor (5), The rotor carrier (6) is rotatably supported by the machine housing (2) at an axial end on the transmission side of the rotor (5), The coupling means for coupling the rotor carrier (6) to the crankshaft (16) is provided at an axial end on the internal combustion engine side of the rotor (5). The coupling means provided at the axial end of the rotor (5) on the internal combustion engine side includes at least one first annular disk (18, 28) that can be detachably connected to the rotor carrier (6), and through the first annular disk (18, 28), the rotor carrier (6) can be coupled to the crankshaft (16). An electric machine, characterized in that a rotor position sensor (24) that is positionally fixed, in particular arranged in the machine housing (2), is provided, and a transmitter annular disk (25) arranged on the rotor carrier (6) is assigned to the rotor position sensor (24). **Claim 6** The electric machine according to claim 5, characterized in that the transmitter annular disk (25) is arranged on a first radial flange (12). **Claim 7** An electric machine device, comprising a first electric machine (1) and a second electric machine. The first electric machine (1) is an electric machine for a drive train of an electrically drivable motor vehicle, and includes a machine housing (2), a rotor (5) provided with a rotor carrier (6) accommodated in the machine housing (2), and coupling means for coupling the rotor carrier (6) to a crankshaft (16) of an internal combustion engine. In the electric machine, the rotor carrier (6) axially extends from the transmission side to the internal combustion engine side of the rotor (5), the rotor carrier (6) is rotatably supported by the machine housing (2) at the axial end of the rotor (5) on the transmission side, the coupling means for coupling the rotor carrier (6) to the crankshaft (16) is provided at the axial end of the rotor (5) on the internal combustion engine side, and the coupling means provided at the axial end of the rotor (5) on the internal combustion engine side includes at least one first annular disk (18, 28) that can be detachably connected to the rotor carrier (6), and through the first annular disk (18, 28), the rotor carrier (6) can be coupled to the crankshaft (16). The second electric machine is an electric machine device including a transmission drivingly connected to the second electric machine. **Claim 8** A method for attaching an electric machine (1) to a crankshaft (16) of an internal combustion engine, The electric machine (1) is an electric machine for a drive train of an electrically drivable motor vehicle, comprising a machine housing (2), a rotor (5) comprising a rotor carrier (6) accommodated in the machine housing (2), and coupling means for coupling the rotor carrier (6) to a crankshaft (16) of an internal combustion engine. In the electric machine, the rotor carrier (6) extends axially from the transmission side to the internal combustion engine side of the rotor (5), the rotor carrier (6) is rotatably supported by the machine housing (2) at an axial end on the transmission side of the rotor (5), the coupling means for coupling the rotor carrier (6) to the crankshaft (16) are provided at an axial end on the internal combustion engine side of the rotor (5), the coupling means provided at the axial end on the internal combustion engine side of the rotor (5) include at least one first annular disk (18, 28) that can be detachably connected to the rotor carrier (6), and via the first annular disk (18, 28), the rotor carrier (6) can be coupled to the crankshaft (16). Detach the first annular disk (18, 28) from the rotor carrier (6) or the second annular disk (26). Couple the first annular disk (18, 28) to the crankshaft (16), and after this coupling, position the electric machine (1) such that a second radial flange (15) abuts against the first annular disk (18), or Position such that a radially outer edge region of the second annular disk (26) overlaps with the first annular disk (28). Couple the rotor carrier (6) to the first annular disk (18), or A method, characterized by coupling the second annular disk (26) to the first annular disk (28).

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