Traction drive with slip ring assembly, motor vehicle

Abstract

The invention relates to a traction drive (10) for an at least partially electrically driven motor vehicle, comprising a shaft (11) having a rotor shaft section (14) and a transmission shaft section (24) arranged coaxially to the rotor shaft section (14), the transmission shaft section (24) having a transmission shaft end section (34) on a side facing away from the rotor shaft section (14), the rotor shaft section (14) has a transmission shaft end section (24) on which a slip ring assembly (36) is arranged on the side facing away from the transmission shaft section (24), the rotor shaft section (14) has a rotor shaft end section (38) on which a winding contact module (40) is arranged on the side facing away from the transmission shaft section (24), and an electrically conductive connecting element (42) is guided via the rotor shaft section (14) and the transmission shaft section (24), the conductive connection element electrically connects the slip ring assembly (36) and the winding contact module (40) to each other.

Description

Technical Field

[0001] The invention relates to a traction drive for an at least partially electrically driven motor vehicle, wherein the traction drive has at least one shaft with a rotor shaft section and a gear shaft section, wherein a slip ring assembly is arranged on the gear shaft. The slip ring assembly is electrically conductively connected to a contact module via a connecting element. The subject matter of the invention is also a motor vehicle having a traction drive according to the invention. Background Art

[0002] Electric motors for drive devices of motor vehicles are generally known. Such an electric motor is described, for example, in DE 102012201644A1. The electric motor has a rotor configured as a claw-pole rotor, which includes a rotor shaft. The rotor shaft has a coupling device for connecting to a transmission mechanism at the end. A slip ring device is arranged on the end of the rotor shaft opposite to the coupling device. The slip ring assembly is configured to energize the rotor or the rotor winding of the rotor.

[0003] A disadvantage of the known drive devices is that the installation space on the side of the electric machine is limited. On the contrary, the goal is to use the installation space of the electric machine by longer active components, such as a longer rotor and a longer stator, in order to increase the effective power of the electric machine. Summary of the invention

[0004] The object of the present invention is to provide a solution with which the installation space of a traction drive for a separately excited electric rotor can be effectively utilized in order to be able to provide a traction drive with increased performance or to increase the power density of the traction drive.

[0005] This object is achieved by the subject matter of the independent claims. Preferred improvements are the subject matter of the dependent claims, the following description and the drawings. Each feature can represent an aspect of the invention both individually and in combination, unless something to the contrary is clearly evident from the description.

[0006] In a first aspect, the invention relates to a traction drive for an at least partially electrically driven motor vehicle, the traction drive comprising a shaft having a rotor shaft section and a transmission shaft section arranged coaxially to the rotor shaft section, wherein the transmission shaft section has a transmission shaft end section on a side facing away from the rotor shaft section, a slip ring assembly is arranged on the transmission shaft end section, the rotor shaft section has a rotor shaft end section on a side facing away from the transmission shaft section, a winding contact module is arranged on the rotor shaft end section, and an electrically conductive connecting element is guided through the rotor shaft section and the transmission shaft section, which electrically conductive connecting element connects the slip ring assembly and the winding contact module to one another in an electrically conductive manner.

[0007] In other words, according to the first aspect of the present invention, a traction drive for a motor vehicle that is at least partially electrically driven is provided. The traction drive comprises at least one shaft. The shaft has a rotor shaft section that is usually rotatably supported around the axis of rotation of the shaft or rotor shaft section. A rotor lamination stack having a rotor winding is usually arranged at least in sections on the outer peripheral side of the rotor shaft section. A transmission shaft section connected and / or coupled to the rotor shaft section is arranged coaxially with the rotor shaft section. The rotor shaft section is connected to the transmission shaft section in such a way that the rotational movement of the rotor shaft section can be transmitted to the transmission shaft section. It is conceivable that the transmission shaft section and the rotor shaft section are constructed integrally with each other. In other words, a shaft comprising a transmission shaft section and a rotor shaft section is manufactured in one manufacturing process. It is also conceivable that the rotor shaft section is a rotor shaft and the transmission shaft section is a transmission shaft different from the rotor shaft. In other words, the shaft is constructed in at least two parts. The coupling between the transmission shaft and the rotor shaft can preferably be a form-locking coupling in the form of a toothing. The transmission shaft section has a transmission shaft end section on the side facing away from the rotor shaft section, wherein a slip ring assembly is arranged on the transmission shaft end section. The rotor shaft section has a rotor shaft end section on the side facing away from the transmission shaft section. A winding contact module for electrically connecting to a rotor winding wound on the rotor is arranged on the rotor shaft end section. The slip ring assembly and the winding contact module are electrically connected to each other through an electrically conductive connecting element. The electrically conductive connecting element is guided through the transmission shaft section and through the rotor shaft section. Since the slip ring assembly is now not arranged on the rotor shaft side, but on the transmission shaft end section of the transmission shaft section, the saved structural space in the area of ​​the motor can now be utilized by the active component, so that the effective power of the traction drive can be increased. In other words, the power density of the traction drive can be increased. The installation space on the gearbox side on the side of the gearbox facing away from the electric machine is usually less critical for installation space, so that this installation space can be used for slip ring assemblies for energizing the separately excited rotor. Thus, a solution is provided in this way, with which the installation space of a traction drive with a separately excited electric rotor can be effectively utilized, so that a traction drive with increased performance or increased power density can be provided.

[0008] An advantageous improvement of the present invention is that the slip ring assembly has at least one slip ring and a slip ring conductor connected to the slip ring, wherein the slip ring conductor has a conductor end on the side facing away from the slip ring, which conductor end is electrically conductively connected to the connecting element. In other words, the slip ring is not directly connected to the connecting element, but indirectly via the slip ring conductor. The slip ring conductor is therefore a connecting element between the slip ring and the connecting element guided through the rotor shaft section and the transmission shaft section.

[0009] It is conceivable that the inner diameter of the slip ring is larger than the outer diameter of the transmission shaft section in the region of the transmission shaft end section. In this way, a slip ring assembly with a slip ring can be plugged onto the transmission shaft section, thereby reducing the axial installation space of the traction drive.

[0010] The slip ring conductor preferably has a first section, which extends parallel to the longitudinal axis of the transmission shaft section and is connected to the slip ring. Preferably, a second section is arranged at the first section, which is configured at a right angle to the longitudinal axis of the transmission shaft section. The free end of the second section is preferably electrically conductively connected to the connecting element.

[0011] In a preferred embodiment of the present invention, it is provided that the conductor end is connected to the connecting element in a material-locked, form-locked and / or force-locked manner. The material-locked connection can preferably be a conductive adhesive connection and / or a soldered connection. The form-locked connection is preferably realized by a press-fit connection. In this regard, it is advantageously provided, but not limited to this, that the conductor end of the slip ring conductor is configured as a female connector and the connecting element or its end is configured as a male connector. The force-locked connection can preferably be a clamping and / or a screw connection.

[0012] If the slip ring conductor has a first section and a second section, the female connector for the press-fit connection to the connecting element is preferably formed at the free end of the second section.

[0013] According to an advantageous design of the present invention, it is provided that the slip ring assembly has a first supporting element made of an electrically insulating material, in which the slip ring and the slip ring conductor are arranged at least partially in sections, and the first supporting element is arranged on the transmission mechanism shaft end section. The slip ring assembly therefore has a first supporting element. The first supporting element is electrically insulating. Preferably, the first supporting element is made of plastic. The first supporting element made of plastic can have a low weight and be manufactured inexpensively. The slip ring and the slip ring conductor are arranged at least partially in sections in the first supporting element. The first supporting element is preferably arranged on the transmission mechanism shaft end section in a material-locked, force-locked and / or form-locked manner. The material-locked connection or arrangement can preferably be an adhesive connection. The force-locked connection is preferably a threaded connection. The form-locked connection is preferably formed by a protrusion embedded in a groove. In this way, the slip ring assembly can be easily arranged on the transmission mechanism shaft end section in a rotationally fixed manner.

[0014] In a preferred embodiment of the present invention, it is provided that the winding contact module has a contact section extending at a right angle to the longitudinal axis of the shaft or rotor shaft section. The contact section is preferably designed to be electrically conductive. Due to the arrangement of the contact section at a right angle to the longitudinal axis of the rotor shaft section, the contact section can easily establish an electrically conductive connection between the connecting element guided through the rotor shaft section and the rotor winding wound on the rotor lamination stack.

[0015] In this respect, an advantageous development of the invention is that the contact section has a first contact end which is electrically conductively connected to the connecting element and has a second contact end which is spaced apart from the first contact end and is set up and / or constructed for connection to a winding end of the rotor winding.

[0016] According to a preferred improvement of the invention, it is provided that the connecting element is connected to the first contact end in a material-locked, force-locked and / or form-locked manner. The material-locked connection can preferably be a conductive adhesive connection and / or a soldered connection. The form-locked connection is preferably realized by a press-fit connection. In this respect, it is advantageously provided, but not limited to this, that the first contact end of the contact section is configured as a female connector and the connecting element or its end is configured as a male connector. The force-locked connection can preferably be a clamping and / or a screw connection.

[0017] In a preferred design of the present invention, it is provided that the winding contact module has a second supporting element, in which the contact section is at least partially arranged, wherein the second supporting element is arranged in the rotor shaft section and / or on the rotor shaft section at least partially through the rotor shaft end section. The second supporting element is preferably composed of an electrically insulating material. The second supporting element is preferably composed of plastic. It is particularly preferred that the second supporting element is manufactured as an injection molded component. The second supporting element composed of plastic can preferably be manufactured inexpensively and with reduced weight. The contact section can be easily positioned in a fixed position by the second supporting element. The second supporting element can preferably be inserted into the rotor shaft section through the distal end section of the rotor shaft section. In addition, it is conceivable that the second supporting element is preferably inserted into the distal end section of the rotor shaft section at least partially.

[0018] It is conceivable to form an opening with closed edges in the wall of the rotor shaft section in the region of the rotor shaft end section, so that at least the first contact end can be guided through the opening in order to be electrically conductively connected to the connecting element.

[0019] An advantageous improvement of the present invention is that the wall of the rotor shaft section is constructed with a slot in the region of the rotor shaft end section. In other words, starting from the distal end of the rotor shaft end section, at least one slot is constructed in the wall of the rotor shaft section. Through the slot, the contact section can be arranged in such a way that the first contact end is arranged in the interior of the rotor shaft section so as to be electrically conductively connected to the connecting element. In addition, through the slot, it is possible to arrange the second contact end of the contact section outside the rotor shaft section so that the second contact end can be electrically conductively connected to the rotor winding arranged on the rotor lamination stack. The slotted construction of the rotor shaft end section makes it easy to arrange the winding contact module or the contact section so that it can be electrically conductively connected to the connecting element.

[0020] Alternatively, it is conceivable and preferably provided that the wall of the rotor shaft segment has a recess in the region of the rotor shaft end segment on the outer side pointing outward in the radial direction, into which recess the winding contact module is at least partially embedded. It is therefore provided that the winding contact module, preferably with the second support element and the contact segment, is arranged on the second rotor shaft end segment. Furthermore, in contrast to a gap in the wall, a weakening of the structural rigidity of the rotor shaft end segment can be avoided in this way.

[0021] In an advantageous development of the invention, it is provided that the rotor shaft end section is closed by a closing element. In other words, it is provided that the distal end of the rotor shaft end section is closed by a closing element embedded in the rotor shaft end section. The closing element is preferably positioned so that it is arranged in the region of a bearing arrangement for rotatably supporting the rotor in the rotor shaft end section. In this way, the structural rigidity of the rotor shaft section can be increased in the region of the rotor shaft end section, in particular in the case of a slotted design of the end region of the rotor shaft end section.

[0022] The electrically conductive connecting element can be arranged in the rotor shaft section and / or in the transmission shaft section in such a way that it can be easily electrically conductively connected to the winding contact module and / or the slip ring device. Preferably, the electrically conductive connecting element is introduced into the cavity of the rotor shaft section and / or the transmission shaft section through an opening arranged at the end in the rotor shaft section and / or the transmission shaft section.

[0023] An advantageous embodiment of the invention is that the electrically conductive connecting element is fixed in a positionally fixed manner with respect to the radial direction of the rotor shaft section. In other words, it can be provided that the electrically conductive connecting element has a third support element, by means of which the electrically conductive connecting element can be braced against the inner wall of the rotor shaft section and / or the transmission shaft section, so that the electrically conductive connecting element can be positioned in a positionally fixed manner in the cavity of the rotor shaft section and / or the transmission shaft section. It can thus be ensured that, in particular during a rotation of the rotor about its axis of rotation, the electrically conductive connecting element is arranged in a positionally fixed manner in the rotor shaft section and / or the transmission shaft section.

[0024] In a second aspect, the invention relates to a motor vehicle having a traction drive according to the invention.

[0025] The motor vehicle is therefore preferably an at least partially electrically driven motor vehicle.

[0026] It should be noted that all features described above and below with respect to one aspect of the invention are equally applicable to any other aspect of the invention. In particular, all features of the traction drive can also be features of the motor vehicle. This also applies in reverse. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Further features and advantages of the invention can be derived from the dependent claims and the following examples. The examples are not restrictive but rather can be understood as examples. The examples should enable a person skilled in the art to implement the invention. The applicant reserves the right to make single and / or multiple features of the features disclosed in the examples the subject of claims or to incorporate these features into existing claims. The examples are explained in more detail with reference to the drawings.

[0028] in:

[0029] Figure 1 A longitudinal section view of a traction drive is shown;

[0030] Figure 2 shows a sectional view in the region of a rotor shaft end section of a rotor shaft section;

[0031] Figure 3 A longitudinal section through a traction drive is shown in a further embodiment. DETAILED DESCRIPTION

[0032] exist Figure 1 1 shows a longitudinal section through a traction drive 10 for an at least partially electrically driven motor vehicle. The traction drive 10 comprises a shaft 11. The shaft 11 has a rotor shaft section 14 which is rotatably mounted about an axis of rotation 16 of a rotor shaft section 14. A rotor lamination stack 22 with a rotor winding 20 is arranged at least in sections on an outer circumferential surface 18 of the rotor shaft section 14.

[0033] A transmission shaft section 24 coupled to the rotor shaft section 14 in a form-locking manner is arranged coaxially with the rotor shaft section 14. In the present embodiment, the rotor shaft section 14 is connected to the transmission shaft section 24 via a toothing, so that the rotational movement of the rotor shaft section 14 can be transmitted to the transmission shaft section 24. It is conceivable that the rotor shaft section 14 and the transmission shaft section 24 are integrally configured with each other, that is, as one component. In the embodiment, the transmission shaft section 24 is configured separately from the rotor shaft section 14. The rotor shaft section 14 can therefore also be referred to as a rotor shaft. The transmission shaft section 24 can be referred to as a transmission shaft. It is conceivable that, as shown in the embodiment, the transmission shaft section 24 is at least partially embedded in the rotor shaft section 14. However, it is also conceivable to design the transmission shaft section 24 and the rotor shaft section 14 in such a way that the rotor shaft section 14 is connected to the transmission shaft section 24 in a form-fitting manner, preferably by means of a toothing, by at least partially engaging therewith.

[0034] At least one gear wheel 28 is arranged on an outer lateral surface 26 of the transmission shaft section 24 , which gear wheel is in meshing engagement with a further gear wheel 30 of an output shaft 32 .

[0035] The transmission shaft section 24 has a transmission shaft end section 34 on the side facing away from the rotor shaft section 14, wherein a slip ring assembly 36 is arranged on the transmission shaft end section 34. The rotor shaft section 14 has a rotor shaft end section 38 on the side facing away from the transmission shaft section 24. A winding contact module 40 is arranged on the rotor shaft end section 38 for electrically conductive connection to the rotor winding 20 wound on the rotor lamination stack 22. The slip ring assembly 36 and the winding contact module 40 are electrically conductively connected to each other via an electrically conductive connecting element 42. The electrically conductive connecting element is guided through the transmission shaft section 24 and through the rotor shaft section 14. Since the slip ring assembly 36 is now not arranged on the rotor shaft side, but on the transmission shaft end section 34 of the transmission shaft section 24, the saved installation space in the area of ​​the electric machine or rotor can now be utilized by the active component, so that the effective power of the traction drive 10 can be increased. The installation space on the gearbox side on that side of the gearbox which faces away from the electric machine is usually less critical for installation space, so that it can be used for the slip ring arrangement 34 for energizing the separately excited rotor.

[0036] The slip ring assembly 36 has at least one slip ring 44 of annular shape and a slip ring conductor 46 connected to the slip ring 44, wherein the slip ring conductor 46 has a conductor end 48 on the side facing away from the slip ring 44, which conductor end is electrically conductively connected to the electrically conductive connecting element 42. In other words, the slip ring 44 is not directly connected to the connecting element, but indirectly via the slip ring conductor 46. The slip ring conductor 46 is therefore a connecting element between the slip ring 44 and the electrically conductive connecting element 42 which is guided through the rotor shaft segment 14 and the transmission shaft segment 24.

[0037] The slip ring conductor 46 preferably has a first section which extends parallel to the longitudinal axis of the transmission shaft section 24 and is connected to the slip ring 44. Preferably, a second section is arranged on the first section, which is designed at a right angle to the longitudinal axis of the transmission shaft section 24. The free end of the second section is preferably electrically conductively connected to the electrically conductive connecting element 42.

[0038] In the present embodiment, the conductor end 48 of the slip ring conductor 46 is connected to the conductive connecting element 42 by a press fit connection. The conductive connecting element 42 is preferably configured as a male connector at its end. The conductor end 48 of the slip ring conductor 46 is preferably configured as a female counterpart to the male connector. Alternatively and / or in addition, a material-locked connection, such as a solder connection, can preferably be provided to conductively connect the conductor end 48 to the conductive connecting element 42.

[0039] The slip ring assembly 36 further comprises a first support element 50 made of an electrically insulating material, in which the slip ring 44 and the slip ring conductor 46 are arranged at least in sections. The first support element 50 is arranged on the gear shaft end section 34 .

[0040] A brush device 52 for energizing the slip ring assembly 36 , in particular the at least one slip ring 44 , is arranged at a distance from the slip ring assembly 36 in the radial direction.

[0041] The winding contact module 40 has at least one contact section 54 extending at a right angle to the longitudinal axis of the rotor shaft section 14. The contact section 54 is designed to be electrically conductive. Due to the arrangement of the contact section 54 at a right angle to the longitudinal axis of the rotor shaft section 14, the contact section 54 can easily establish an electrically conductive connection between the connecting element 42 guided through the rotor shaft section 14 and the rotor winding 20 wound on the rotor lamination stack 22.

[0042] The contact section 54 has a first contact end 56 which is electrically conductively connected to the connecting element 42 and a second contact end 58 which is spaced apart from the first contact end 56 and is designed and / or constructed for connection to a winding head of the rotor winding 20 .

[0043] In the present embodiment, the connecting element 42 is connected in a form-fitting manner by a press-fit connection to the first contact end 56. Advantageously, the first contact end 56 of the contact section 54 is designed as a female connector and the connecting element 42 or its end is designed as a male connector.

[0044] The winding contact module 40 further comprises a second support element 60 in which the contact section 54 is at least partially arranged, wherein the second support element 60 is arranged at least partially through the rotor shaft end section 38 in and / or on the rotor shaft section 14. The second support element 60 consists of an electrically insulating material, in particular a plastic.

[0045] The traction drive 10 has three bearings for supporting the rotor shaft section 14 and / or the transmission shaft section 24. It is provided that the winding contact module 40 is arranged between a first bearing 62 in the region of the rotor shaft end section 38 and a first end side 64 of the rotor lamination stack 22. The first end side 64 is configured on the side of the rotor lamination stack 22 facing away from the transmission shaft section 24. The rotor lamination stack 22 has a second end side 66 facing the transmission shaft section 24. A second bearing 68 is arranged between the second end side 66 and the gear 28 arranged on the transmission shaft section 24. A third bearing 70 is configured between the gear 28 and the slip ring assembly 36. The slip ring assembly 36 is therefore arranged outside the transmission, so that the slip ring assembly is arranged in a manner protected from lubricants from the transmission. In addition, the slip ring assembly 36 arranged in this way enables easy maintenance of the brushes of the brush device 52.

[0046] exist Figure 2 , a cross-sectional view of a region in the rotor shaft end section 38 of the rotor shaft section 14 is shown. The wall 72 of the rotor shaft section 14 is slotted in the region of the rotor shaft end section 38. In other words, at least one slot 74 is formed in the wall 72 of the rotor shaft section 14 starting from the distal end of the rotor shaft end section 38. The slot 74 allows the contact section 54 to be arranged in such a way that the first contact end 56 is arranged in the interior of the rotor shaft section 14 in order to be electrically conductively connected to the connecting element 42. Furthermore, the slot 74 makes it possible to arrange the second contact end 58 of the contact section 54 outside the rotor shaft section 14 so that it can be electrically conductively connected to the rotor winding 20 arranged on the rotor lamination stack 22. The slotted design of the rotor shaft end section 38 makes it easy to arrange the winding contact module 40 so that it can be electrically conductively connected to the connecting element 42.

[0047] The rotor shaft end section 38 is closed by a closing element 76 .

[0048] In other words, it is provided that the distal end of the rotor shaft end section 38 is closed by means of a closing element 76 which is embedded in the rotor shaft end section 38. The closing element 76 is positioned such that it is arranged in the region of the first bearing 62. In this way, the structural rigidity of the rotor shaft section 14 in the region of the rotor shaft end section 38 can be increased, in particular in the case of a slotted design of the end region of the rotor shaft end section 38.

[0049] Figure 3 A longitudinal section through a traction drive 10 is shown in a further embodiment. Figure 3 The traction drive 10 shown in FIG. 1 differs from the traction drive 10 in the design of the rotor shaft end section 38 and the construction of the winding contact modules 40 . Figure 1 1. The traction drive 10 described in the embodiment of the present invention. In particular, the rotor shaft end section 38 has at least one groove 78 on the outer side pointing outward in the radial direction. The groove 78 extends in the axial direction of the rotor shaft section 14 or the shaft 11. The winding contact module 40 having the second support element 60 and the contact section 54 is inserted at least partially on the outer side of the rotor shaft end section 38 and embedded at least partially in the groove 78. At the distal end of the rotor shaft end section 38, the conductive connecting element 42 is conductively connected to the first contact end 56 of the contact section 54. Thus, an electrical connection can be realized outside the rotor shaft end section 38, which can make the connection easier and more cost-effective to design. The first bearing 62 is arranged between the first contact end 56 and the second contact end 58 of the contact section 54 in the region of the groove 78 on the outer side of the rotor shaft end section 38.

Claims

1. A traction drive (10) for an at least partially electrically driven motor vehicle, comprising a shaft (11) having: a rotor shaft section (14); and a transmission shaft section (24) arranged coaxially with the rotor shaft section (14), in, The transmission shaft section (24) has a transmission shaft end section (34) on the side facing away from the rotor shaft section (14), on which a slip ring assembly (36) is arranged. The rotor shaft section (14) has, on a side facing away from the transmission shaft section (24), a rotor shaft end section (38), on which a winding contact module (40) is arranged, and An electrically conductive connecting element (42) is guided through the rotor shaft section (14) and the transmission shaft section (24), which electrically conductively connects the slip ring assembly (36) and the winding contact module (40) to one another.

2. The traction drive according to claim 1, characterized in that The slip ring assembly (36) comprises at least one slip ring (44) and a slip ring conductor (46) connected to the slip ring (44), wherein the slip ring conductor (46) comprises a conductor end (48) on a side facing away from the slip ring (44), which conductor end is electrically conductively connected to the connecting element (42).

3. The traction drive according to claim 2, characterized in that The conductor end (48) is connected to the connecting element (42) in a materially locking, form-locking and / or force-locking manner.

4. The traction drive according to claim 2, characterized in that The slip ring assembly (36) has a first support element (50) made of an electrically insulating material, in which the slip ring (44) and the slip ring conductor (46) are arranged at least in sections, and the first support element (50) is arranged on the transmission shaft end section (34).

5. Traction drive according to any one of the preceding claims, characterized in that The winding contact module (40) has a contact section (54) extending at a right angle to the longitudinal axis of the rotor shaft section (14).

6. The traction drive according to claim 5, characterized in that The contact section (54) has a first contact end (56) which is electrically conductively connected to the connecting element (42) and has a second contact end (58) which is spaced apart from the first contact end (56) and is designed and / or constructed for connection to a winding end of a rotor winding (20).

7. The traction drive according to claim 6, characterized in that The connecting element (42) is connected to the first contact end (56) in a materially locking, force-locking and / or form-locking manner.

8. The traction drive according to any one of claims 5 to 7, characterized in that The winding contact module (40) has a second support element (60) in which the contact section (54) is at least partially arranged, wherein the second support element (60) is arranged at least partially through the rotor shaft end section (38) in the rotor shaft section (14) and / or on the rotor shaft section (14).

9. Traction drive according to any one of the preceding claims, characterized in that The wall (72) of the rotor shaft section (14) is slotted in the region of the rotor shaft end section (38).

10. The traction drive according to any one of claims 1 to 8, characterized in that The wall (72) of the rotor shaft section (14) has a recess on the outer side pointing outward in the radial direction in the region of the rotor shaft end section (38), into which recess the winding contact module (40) is at least partially embedded.

11. Traction drive according to any one of the preceding claims, characterized in that The rotor shaft end section (38) is closed by a closing element (76).

12. Traction drive according to any one of the preceding claims, characterized in that The electrically conductive connecting element (42) is fixed in a stationary manner with respect to the radial direction of the rotor shaft section (14).

13. Traction drive according to any one of the preceding claims, characterized in that The transmission shaft section (24) and the rotor shaft section (14) are designed integrally with one another.

14. The traction drive according to any one of claims 1 to 12, characterized in that The rotor shaft section (14) is a rotor shaft, and the transmission shaft section (24) is a transmission shaft different from the rotor shaft.

15. A motor vehicle having a traction drive (10) according to any one of the preceding claims.

Images