Wire end bending device and method for bending wire ends when manufacturing a component with coils of an electric machine

Abstract

With a wire end bending device (10) for bending a wire end when manufacturing a component provided with a coil of an electric machine, the wire end is bent in the circumferential direction, and the wire end projects from an annular housing (11) of the component. Receiving and rotating devices (12a, 12b, 12c, etc.) are used to receive and to twist the wire end in order to bend it in the circumferential direction (U). The wire ends to be received in the different receiving and rotating devices (12a, 12b, 12c, etc.) are arranged radially offset relative to one another. An axial bearing (16) is used to receive an axial force which acts on the receiving and rotating devices (12a, 12b, 12c, etc.) such that the receiving and rotating devices can rotate relative to one another and relative to the housing (11) about a common axis (A), however, are held fixed relative to one another in the axial direction. Radial bearings (15a, 15b, 15c, 15d) are arranged distributed around the receiving and rotating devices (12a, 12b) and are used to receive radial forces.

Description

Field of the Invention

[0001] The present invention relates to a wire end bending device for bending wire ends when manufacturing a component provided with coils of an electric machine. Furthermore, the present invention relates to a method for bending wire ends when manufacturing a component provided with coils of an electric machine. Background Art

[0002] An electric machine should be understood in particular as a machine for converting electrical energy into kinetic energy and a machine for converting kinetic energy into electrical energy. In particular, this is understood as an electric motor and a generator.

[0003] When manufacturing mechanical elements or components of such an electric machine, such as, for example, a stator or a rotor, it is usually necessary to connect the ends of conductors formed by electric wires to each other or otherwise process these ends together, such as, for example, cutting or shaping them together.

[0004] For example, there are electric motors in which the coil windings, in particular the coil windings of the stator, are formed by different line segments, and the ends of the coil windings are connected to each other. Devices and methods for connecting the wire ends of hairpins to form the stator winding of an electric machine are known, in which the wire ends are welded to each other. In this case, the devices and methods are designed to position and tension the wire ends before welding.

[0005] In order to achieve the electrical interconnection of, in particular, the stator, for example, the end sections of a rod-shaped conductor are stranded in one process step. For this process step, it is necessary to first manufacture the rod-shaped conductor or the lead or the hairpin and join it to the lamination stack. Since the spacing between the end sections of the rod-shaped conductor is small after the joining process, the end sections are widened in the next step in order to enable precise stranding or twisting. In order to create a distance between the individual rod-shaped conductors or conductors, the end sections of the rod-shaped conductor or conductor are reshaped in the widening process in the radial direction.

[0006] In a stator, for example, a plurality of conductors are arranged in the slots of the stator housing. Usually, all the conductors located on the radius are processed by means of a tool after the widening process. In this processing, all the conductor ends are first introduced into the box of the tool and then stranded, with the tool rotating around the central axis. The stranding causes the rod-shaped conductor to shorten in the axial direction. In order to prevent relative movement between the rod-shaped conductor and, for example, a tool configured as a twisting crown and damage to the rod-shaped conductor or its insulation, the stator or the twisting crown must be followed axially at the back. This movement follows a complex velocity profile because the rod-shaped conductor deforms three-dimensionally.

[0007] Usually, the radially adjacent rod-shaped conductors are stranded in opposite directions, so that at least two twisting crowns are used.

[0008] A device is described in document WO 2019 / 161846 A1. With the aid of this device, for example, eight twisting crowns are used and subsequently eight twisting planes are achieved. However, disadvantageously, there is a high position requirement in the vertical direction. In addition, the construction requires very long and at the same time thin-walled twisting tools, which have a sleeve-like basic shape and are costly due to their thus-consuming manufacturing method.

[0009] A similar construction is described in WO 2017 / 104685A1. Here, the twisting tools are made with thicker walls; however, a larger number of twisting tools results in a very complex construction and / or thin-walled tools.

[0010] EP 2 849 319 A1 describes another way of supporting the twisting tools. Here, a very compact construction is achieved in such a way that only two twisting tools engage simultaneously. However, in the twisting process, all axes engage simultaneously, and a shorter cycle time is feasible and better twisting results can be achieved, for example, by the influence of the leads on each other. When twisting sequentially, the leads influence each other more strongly due to their elastic properties. Summary of the Invention

[0011] The object of the present invention is to implement a wire end bending device for bending wire ends when manufacturing a component of an electric machine provided with coils, the wire end bending device being characterized by a small height and enabling the design and manufacture of low-cost twisting tools. In addition, a method for bending wire ends when manufacturing a component of an electric machine provided with coils should be provided, which can be carried out quickly and reliably and enables high quality of the manufactured component.

[0012] The object is achieved by the wire end bending device according to the present invention and by the method according to the present invention. Advantageous design solutions, features, and details are given below.

[0013] According to a first aspect, the present invention realizes a wire end bending device for bending wire ends when manufacturing a component provided with coils of an electric machine, wherein the wire ends protrude from an annular housing of the component and are bent in the circumferential direction. The wire end bending device includes: a first receiving and rotating device for receiving a first wire end and for twisting the first wire end in order to bend it in the circumferential direction; at least one second receiving and rotating device for receiving a second wire end radially offset from the first wire end and for twisting the second wire end in order to bend it in the circumferential direction; a first drive element for driving the first receiving and rotating device; a second drive element for driving the second receiving and rotating device; a plurality of axial bearings for receiving axial forces acting on the receiving and rotating devices and for supporting the receiving and rotating devices such that the receiving and rotating devices can rotate relative to each other and relative to the housing about a common axis, but are fixedly held relative to each other in the axial direction, and a plurality of radial bearings arranged distributed around the receiving and rotating devices for receiving radial forces acting on the receiving and rotating devices such that the receiving and rotating devices are fixedly held in the radial direction.

[0014] The present invention can in particular realize a structure with multiple twisting planes, which is very compact especially in height. On the one hand, this enables the low-cost manufacture of the receiving and rotating devices or twisting tools, and on the other hand, the present invention is characterized by the small space requirement of the entire functional assembly, which includes a plurality of twisting tools.

[0015] The central point of the present invention is the support design for receiving processing forces. Forces in the radial direction as well as in the axial direction are generated during the twisting process.

[0016] The present invention utilizes the following basic concept for functional separation: axial bearings are used to receive axial forces and to support the individual twisting tools on each other. Radial bearings are used to receive radial forces.

[0017] In particular, the radial bearings are aggregated at multiple positions and preferably evenly distributed around the circumference of the twisting tools.

[0018] Advantageously, the outer ring of the bearing or the radial bearing also serves as a rolling surface for the twisting tool in addition to receiving radial forces.

[0019] In particular, each twisting tool can rotate around a common central axis or can be correspondingly controlled.

[0020] Another advantage of the present invention is that the entire functional assembly including the twisting tools can be replaced in the device in order to process, for example, another workpiece type. This is achieved in particular due to the compactness of the device and by the possibility of connecting or coupling the drive, for example via a drive element configured as a lever, to the receiving and rotating devices or the twisting tools.

[0021] For example, the drive can be disengaged from the drive element or the lever such that the functional component can be removed from the device. Thereby, the present invention provides a quick-change system for quickly replacing the functional component.

[0022] Preferably, the radial bearing has an annular outer circumferential portion which is configured to receive and rotate the rolling surface of the device during its rotation.

[0023] Advantageously, the outer ring of the radial bearing also serves as a rolling surface for the twisting tool in addition to receiving the radial force.

[0024] Preferably, the radial bearings are arranged distributed around the receiving and rotating device at at least three positions, particularly preferably at four positions.

[0025] The radial bearings are, for example, grouped at at least three or preferably four positions and are preferably evenly distributed around the circumference of the twisting tool.

[0026] Advantageously, each radial bearing includes a plurality of annular bearing elements which are rotatably supported, for example, around the radial bearing axis of the respective radial bearing.

[0027] In particular, each bearing element has an annular outer circumferential portion which is configured to receive and rotate at least one rolling surface of the receiving and rotating device so as to fixedly hold the receiving and rotating device in the radial direction during its rotation.

[0028] Preferably, the receiving and rotating devices are supported on one another in the axial direction.

[0029] Advantageously, the wire end bending device includes a feed unit which is configured to feed at least one of the radial bearings radially from the outside towards the inside in the direction of the receiving and rotating device.

[0030] In particular, the feed unit is formed by an eccentric wheel.

[0031] Preferably, the wire end bending device includes a third receiving and rotating device which is configured to receive a third wire end radially offset relative to the second wire end and to twist the third wire end in order to bend it in the circumferential direction. In particular, the third receiving and rotating device includes a third drive element for driving the third receiving and rotating device.

[0032] Advantageously, the wire end bending device includes one or more additional receiving and rotating devices which are configured to receive additional wire ends radially offset and to twist the additional wire ends in order to bend the wire ends in the circumferential direction. In particular, each additional receiving and rotating device includes an additional drive element for driving the additional receiving and rotating device.

[0033] According to a second aspect, the present invention implements a method for bending wire ends when manufacturing a component provided with coils of an electric machine, wherein the wire ends protrude from an annular housing of the component and are bent in the circumferential direction. The method comprises the following steps: receiving a first wire end by means of a first receiving and rotating device; receiving a second wire end radially offset with respect to the first wire end by means of a second receiving and rotating device; rotating the first receiving and rotating device relative to the housing so as to bend the first wire end in the circumferential direction; rotating the second receiving and rotating device relative to the housing and relative to the first receiving and rotating device so as to bend the second wire end in the circumferential direction; wherein the receiving and rotating devices are rotated about a common axis and are held fixed relative to each other in the axial direction, and wherein the receiving and rotating devices are supported on their outer circumferences so as to be held fixed in the radial direction.

[0034] Preferably, the receiving and rotating device is held on its outer circumference by a rolling surface for receiving radial forces, and the receiving and rotating device preferably rolls on the rolling surface during its rotation.

[0035] Advantageously, the receiving and rotating device is impeded from moving in the radial direction by a rolling surface for receiving radial forces on its outer circumference.

[0036] In particular, the receiving and rotating devices are supported on each other in the axial direction.

[0037] For example, the receiving and rotating devices are each driven by a drive element in order to effect rotation.

[0038] Advantageously, in order to install or when installing the device, at least one radial bearing is fed radially from the outside towards the inside towards the receiving and rotating device in order to support the receiving and rotating device on its outer circumference against radial forces.

[0039] Preferably, in order to disassemble or when disassembling the device, at least one radial bearing is moved radially from the inside outwards in order to release the receiving and rotating device in at least one radial direction.

[0040] Advantageously, the method according to the invention is carried out by means of a device according to the invention.

[0041] The advantages, features and details described in connection with one aspect of the present invention also apply to other aspects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In the following, embodiments are described in detail on the basis of the drawings. Shown therein are:

[0043] Figure 1 A three-dimensional view of a wire end bending device according to a preferred embodiment of the present invention as seen obliquely from above;

[0044] Figure 2a , b show in Figure 1Top view of the wire end bending device shown in, where in Figure 2b the middle cover plate is omitted;

[0045] Figure 3 shows a cross-sectional view of the wire end bending device along the Figure 2a line K-K in; and

[0046] Figure 4 shows a cross-sectional view of the wire end bending device along the Figure 2a line J-J in.

[0047] Elements having the same or similar functions are denoted by the same reference numerals in the drawings. The elements are only described repeatedly when appropriate. Detailed Description

[0048] In Figure 1 a view schematically shows from an oblique upper direction a wire end bending device 10 according to a preferred embodiment of the present invention. The device 10 is used to bend wire ends when manufacturing components of an electric machine, and the components are provided with coils.

[0049] The component to be manufactured is, for example, a stator of an electric motor. The stator should in particular be used as a stator of a traction motor of an electric vehicle, and the electric vehicle preferably has a power range of 20 kW to 400 kW. For this purpose, the stator should receive as many coils as possible, and the coils are formed by the rod-shaped conductors or hairpins.

[0050] The wire end bending device 10 can, for example, be used as part of a component manufacturing device for manufacturing components of an electric machine provided with coils, such as described in the document WO 2019 / 161846 A1 mentioned at the beginning.

[0051] The wire end bending device 10 is designed to bend the wire ends extending axially from the annular or cylindrical housing 11 of the component along the circumferential direction of the housing.

[0052] As can be seen from Figure 1 the three-dimensional view of and Figure 3 the cross-sectional view of, the wire end bending device or the device 10 has a plurality of receiving and rotating devices 12a, 12b, 12c,..., 12x, and the receiving and rotating devices are configured as twisting tools and are respectively used to receive wire ends and twist the wire ends so as to twist the wire ends along the circumferential direction U of the housing 11.

[0053] The twisting tools 12a, 12b, 12c, ……, 12x are configured as annular plates and are directly supported on one another in the axial direction. The twisting tools together form a twisting assembly 13. The wire end received by the first twisting tool 12a is radially offset relative to the wire end received by the second twisting tool 12b, which is adjacent to the first twisting tool 12a.

[0054] That is, the first twisting tool 12a is designed to receive a first wire end and bend the first wire end along the circumferential direction U, while the second twisting tool 12b adjacent to the first twisting tool 12a in the axial direction is configured to receive a second wire end, wherein the second wire end is arranged radially offset relative to the first wire end so as to bend the second wire end along the circumferential direction U.

[0055] Similarly, the third twisting tool 12c adjacent to the second twisting tool 12b in the axial direction is configured to receive a third wire end, wherein the third wire end is arranged radially offset relative to the second wire end received by the second twisting tool 12b so as to twist or bend the third wire end along the circumferential direction U.

[0056] In the same manner, each additional twisting tool 12x is configured to receive an additional wire end, wherein the additional wire end is arranged radially offset relative to the wire end received by the previous adjacent twisting tool so as to twist or bend the additional wire end along the circumferential direction U.

[0057] Each twisting tool 12a, 12b, 12c, ……, 12x is provided on its radially outer side with a drive element 14 configured as a lever for driving the twisting tools 12a, 12b, 12c, ……, 12x, i.e., for rotating the twisting tools along the circumferential direction or about a common central axis A of the twisting tools 12a, 12b, 12c, ……, 12x. For example, the twisting tool 12a is provided with a lever 14a, and the twisting tool 12b is provided with a lever 14b. Here, the individual twisting tools 12a, 12b, 12c, ……, 12x can be twisted relative to one another or rotated independently of one another.

[0058] A plurality of radial bearings 15a, 15b, 15c, 15d, four radial bearings in the example, are arranged around the twisting tools 12a, 12b, 12c, ……, 12x evenly distributed for receiving radial forces that act on the twisting tools in the radial direction (see additionally Figure 2a and 2b ). The twisting tools 12a, 12b, 12c, ……, 12x are fixedly held in the radial direction by the radial bearings 15a, 15b, 15c, 15d. In other embodiments, three or more than four radial bearings can also be provided.

[0059] As can be seen fromFigure 3 As can be seen, it shows a sectional view of the wire end bending device along the Figure 2a wire K-K in. A plurality of axial bearings 16 are used to axially support the twisting tools 12a, 12b, 12c, ……, 12x on each other and to receive an axial force acting in the axial direction A, which axial force acts on the twisting tools 12a, 12b, 12c, ……, 12x. The axial bearings 16 are arranged between the twisting tools 12a, 12b, 12c, ……, 12x which are respectively arranged one above the other, such that the twisting tools can rotate relative to each other and relative to the housing 11 about their common central axis A, and are held fixed relative to each other in the axial direction by the axial bearings 16 here.

[0060] Since the receiving and rotating devices which are configured as the twisting tools 12a, 12b, 12c, ……, 12x are directly supported on each other by the axial bearings 16, the entire structure formed by the twisting assembly 13 formed by the twisting tools 12a, 12b, 12c, ……, 12x and thus also the entire wire end bending device 10 are very compact in the vertical direction, i.e. in the direction of the central axis A.

[0061] Figure 4 For further illustration of the device 10 and showing a sectional view of the wire end bending device along the Figure 2a wire J-J in.

[0062] Returning to Figure 1 , each of the radial bearings 15a, 15b, 15c, 15d has a plurality of annular bearing elements 17, which are annularly configured and are rotatably supported about the common radial bearing axis R of the respective radial bearings 15a, 15b, 15c, 15d. The bearing elements 17 of each of the radial bearings 15a, 15b, 15c, 15d are arranged one above the other in the axial direction.

[0063] Each bearing element 17 has an annular outer circumference 19, and the bearing element adjoins the annular outer circumference of the twisting tool 12a, 12b, 12c, ……, 12x associated with the bearing element with the annular outer circumference. The annular outer circumference 19 of each bearing element 17 is configured as a rolling surface for one of the twisting tools 12a, 12b, 12c, ……, 12x, which twisting tool is arranged radially internally between the surrounding radial bearings 15a, 15b, 15c, 15d. In this way, the twisting tools 12a, 12b, 12c, ……, 12x are held fixed in the radial direction by the bearing elements 17 during their rotation.

[0064] By arranging their annular bearing elements 17 one above the other or in the axial direction and aligned with each other, each of the radial bearings 15a, 15b, 15c, 15d has an annular outer circumference 21, which forms a rolling surface for the twisting tools 12a, 12b, 12c, ……, 12x when the twisting tool rotates about the central axis A of the housing 11.

[0065] Each of the radial bearings 15a, 15b, 15c, 15d together with its plurality of bearing elements 17 is movable in the radial direction. Thus, the radial bearings can be removed or displaced radially outwards from the twisting assembly 13 by means of movement. For this purpose, the radial bearings 15a, 15b, 15c, 15d are respectively connected to a feed unit 22, which is formed by or includes an eccentric wheel in order to move the respective radial bearing in the radial direction towards or away from the twisting assembly 13.

[0066] The levers 14, which serve as drive elements for driving the respectively associated twisting tools 12a, 12b, 12c, ……, 12x, respectively include coupling elements 24 for coupling a drive unit (not shown in the figures) in order to rotate each twisting tool 12a, 12b, 12c, ……, 12x in the circumferential direction via the associated lever 14, such that the wire ends held in the respective twisting tools 12a, 12b, 12c, ……, 12x are bent in the circumferential direction.

[0067] The coupling element 24 is designed such that it can be coupled to and decoupled from the respectively associated drive element 14 in a simple and rapid manner. In the present example, openings 24a are respectively provided in the coupling element 24 for receiving pins for fixing the respective drive unit.

[0068] The twisting assembly 13 together with its plurality of twisting tools 12a, 12b, 12c, ……, 12x is supported in the axial direction between a lower substrate 25 and an upper cover plate 26. Support elements configured as columns are provided between the substrate 25 and the cover plate 26.

[0069] Figure 2a To further illustrate the support design for the twisting tools and how it is formed by the wire end bending device 10, a top view of the wire end bending device or device 10 with an upper cover plate 26 and a lower substrate 25 provided thereon is shown. A twisting assembly 13 with twisting tools is provided between the substrate 25 and the cover plate 26.

[0070] Figure 2bA similar top view is shown, where the cover plate 26 is omitted, however. Thereby, in particular, the annular twisting assembly 13 is illustrated together with the radial bearings 15a, 15b, 15c, 15d surrounding the twisting assembly, and the radial bearings are evenly distributed around the circumference of the twisting tools 12a, 12b, 12c, ……, 12x at four positions.

[0071] Each twisting tool 12a, 12b, 12c, ……, 12x is driven by a lever 14 and can rotate about a common central axis A. By selecting four radial bearing positions, a large twisting angle is obtained for each driver and at the same time a high flexibility with respect to the arrangement of the drivers is obtained.

[0072] Below, a preferred embodiment of the method according to the invention will be described with reference to the drawings.

[0073] In this example, a method for bending wire ends during the manufacture of a stator provided with coils is carried out. The wire ends project from an annular housing 11 and the wire ends are bent along the circumferential direction of the housing by means of the method.

[0074] In a first step, the wire ends are received in receiving and rotating devices or twisting tools 12a, 12b, 12c, ……, 12x, where each twisting tool forms a receiving and rotating device. The wire ends received in respectively adjacent or adjoining twisting tools are offset relative to each other. That is to say, the first wire end is received by means of the first twisting tool 12a, and the second wire end is received by means of the second twisting tool 12b, where the second wire end is arranged radially offset relative to the first wire end.

[0075] The third wire end or a further wire end is received in the third twisting tool 12c and in a further twisting tool 12x, and the third wire end or the further wire end is respectively radially offset relative to the wire ends received in the previous twisting tools.

[0076] Now, the first twisting tool 12a is rotated relative to the housing 11, whereby the first wire end received therein is bent along the circumferential direction U of the housing 11. The second twisting tool 12b arranged adjacent to the first twisting tool 12a together with the second wire end received therein is also rotated relative to the housing 11 in order to bend the second wire end along the circumferential direction. Here, a relative rotational movement between the first and second twisting tools is also carried out.

[0077] Similarly, the third twisting tool 12c and the further twisting tools 12x together with the second wire end or the further wire ends received therein are rotated relative to the housing 11, whereby the second wire end and the further wire ends are twisted or bent along the circumferential direction U. Here, the wire ends are respectively arranged radially offset relative to the wire ends received in the previous twisting tools, and a relative rotational movement between two adjacent or adjoining twisting tools is also carried out.

[0078] The twisting tools 12a, 12b, 12c rotate about their common central axis A during their rotation. Here, the twisting tools 12a, 12b, 12c, ……, 12x are held relative to each other fixed in the axial direction by the axial bearings 16. Additionally, the twisting tools 12a, 12b, 12c, ……, 12x are each supported on their outer circumferences 27, thereby holding the twisting tools fixed in the radial direction R.

[0079] The support is achieved by the above-mentioned radial bearings 15a, 15b, 15c, where each radial bearing 15a, 15b, 15c supports the radially inner twisting tool from the outside such that the twisting tool cannot move radially outwards.

[0080] The twisting tools 12a, 12b, 12c, ……, 12x roll on the rolling surfaces 19 or 21 during their rotation, and the rolling surfaces are provided on their outer circumferences 27 and receive radial forces.

[0081] Thereby, the twisting tools 12a, 12b, 12c, ……, 12x impede movement in the radial direction.

[0082] The twisting tools 12a, 12b, 12c, ……, 12x are supported on each other in the axial direction by the axial bearings 16 and are each driven by the drive elements 14 in order to effect their respective rotations.

[0083] In order to mount the twisting assembly in the wire end bending device 10, at least one of the radial bearings 15a, 15b, 15c, 15d is fed radially from the outside inwards to the twisting tools 12a, 12b, 12c, ……, 12x in order to support the twisting tools against radial forces on their outer circumferences.

[0084] In order to disassemble the twisting assembly and / or in order to replace the twisting assembly, at least one of the radial bearings 15a, 15b, 15c, 15d is moved radially from the inside outwards in order to release the twisting tools 12a, 12b, 12c, ……, 12x in at least one radial direction.

[0085] List of reference numerals

[0086] 10 Wire end bending device or apparatus

[0087] 12a, 12b, 12c, ……, 12x Receiving and rotating means or twisting tools

[0088] 13 Twisting assembly

[0089] 14 Drive element / lever

[0090] 14a, 14b First or second drive element

[0091] 15a, 15b, 15c, 15d Radial bearings

[0092] 16 Axial bearing

[0093] 17 Bearing element of the radial bearing

[0094] 19 Outer circumference / rolling surface of the bearing element

[0095] 21 Outer circumference / rolling surface of the radial bearing

[0096] 22 Feed unit

[0097] 24 Coupling element

[0098] 24a Opening

[0099] 25 Substrate

[0100] 26 Cover plate

[0101] 27 Outer circumference of the twisting tool

[0102] A Axial direction, central axis

[0103] R Radial direction

[0104] U Circumferential direction

Claims

1. A wire end bending device for bending a wire end when manufacturing a component provided with a coil of an electric machine, wherein the wire end projects from an annular housing (11) of the component and is bent in a circumferential direction, the wire end bending device comprising a first receiving and rotating device (12a) for receiving a first wire end and for twisting the first wire end in order to bend it in the circumferential direction, at least one second receiving and rotating device (12b) for receiving a second wire end radially offset from the first wire end and for twisting the second wire end in order to bend it in the circumferential direction, a first drive element (14a) for driving the first receiving and rotating device (12a), a second drive element (14b) for driving the second receiving and rotating device (12b), a plurality of axial bearings (16) for receiving an axial force acting on the first receiving and rotating device (12a) and the second receiving and rotating device (12b), and for supporting the first receiving and rotating device (12a) and the second receiving and rotating device (12b) such that the first receiving and rotating device (12a) and the second receiving and rotating device (12b) can rotate relative to each other and relative to the housing (11) about a common axis (A), but are held fixed relative to each other in the axial direction, and a plurality of radial bearings (15a, 15b, 15c, 15d) arranged distributed around the first receiving and rotating device (12a) and the second receiving and rotating device (12b) for receiving a radial force acting on the first receiving and rotating device (12a) and the second receiving and rotating device (12b) such that the first receiving and rotating device (12a) and the second receiving and rotating device (12b) are held fixed in the radial direction.

2. The wire end bending device according to claim 1, characterized in that the radial bearings (15a, 15b, 15c, 15d) have an annular outer circumference (21) configured as a rolling surface for the first receiving and rotating device (12a) and the second receiving and rotating device (12b) during their rotation.

3. The wire end bending device according to claim 1 or 2, characterized in that the radial bearings are arranged distributed around the first receiving and rotating device (12a) and the second receiving and rotating device (12b) in at least three positions.

4. The wire end bending device according to claim 1 or 2, characterized in that The radial bearings (15a, 15b, 15c, 15d) each include a plurality of annular bearing elements (17), which are rotatably supported about the radial bearing axes (R) of the respective radial bearings (15a, 15b, 15c, 15d), wherein each bearing element (17) has an annular outer circumferential surface (19), which is configured as a rolling surface for at least one of the first receiving and rotating device (12a) and the second receiving and rotating device (12b) so as to fixedly hold the at least one receiving and rotating device in the radial direction during its rotation.

5. The wire end bending device according to claim 1 or 2, characterized in that the first receiving and rotating device (12a) and the second receiving and rotating device (12b) are axially supported on one another.

6. The wire end bending device according to claim 1 or 2, characterized in that a feed unit (22) is provided, which is configured to radially feed at least one of the radial bearings (15a, 15b, 15c, 15d) from the outside to the inside in the direction of the first receiving and rotating device (12a) and the second receiving and rotating device (12b).

7. The wire end bending device according to claim 1 or 2, characterized in that a third receiving and rotating device (12c) is provided, which is configured to receive a third wire end radially offset with respect to the second wire end and to twist the third wire end, and for circumferential bending (U), the third receiving and rotating device includes a third drive element (14) for driving the third receiving and rotating device, and / or one or more additional receiving and rotating devices (12d) are provided, which are configured to receive additional wire ends radially offset and to twist the additional wire ends, and for circumferential bending (U), the one or more additional receiving and rotating devices include additional drive elements (14) for driving the additional receiving and rotating devices (12d).

8. A method for bending a wire end when manufacturing a component provided with a coil of an electric machine, wherein the wire end projects from an annular housing (11) of the component and is bent in the circumferential direction (U), the method comprising the following steps: receiving a first wire end by means of a first receiving and rotating device (12a); receiving a second wire end radially offset with respect to the first wire end by means of a second receiving and rotating device (12b); rotating the first receiving and rotating device (12a) relative to the housing (11) so as to bend the first wire end in the circumferential direction (U); rotating the second receiving and rotating device (12b) relative to the housing (11) and relative to the first receiving and rotating device (12a) so as to bend the second wire end in the circumferential direction (U); wherein the first receiving and rotating device (12a) and the second receiving and rotating device (12b) are rotated about a common axis (A) and are fixedly held axially relative to one another. and wherein the first receiving and rotating device (12a) and the second receiving and rotating device (12b) are supported on their outer circumferences so as to be fixedly held in the radial direction, For installation, at least one radial bearing (15a, 15b, 15c, 15d) is fed radially from the outside to the inside to the first receiving and rotating device (12a) and the second receiving and rotating device (12b) so as to support the first receiving and rotating device (12a) and the second receiving and rotating device (12b) against radial forces on their outer circumferences; and / or For disassembly, at least one radial bearing (15a, 15b, 15c, 15d) is moved radially from the inside to the outside so as to release the first receiving and rotating device (12a) and the second receiving and rotating device (12b) in at least one radial direction.

9. The method according to claim 8, characterized in that, the first receiving and rotating device (12a) and the second receiving and rotating device (12b) are held on their outer circumferences by rolling surfaces (19, 21) that receive radial forces, and the first receiving and rotating device (12a) and the second receiving and rotating device (12b) roll on the rolling surfaces during their rotation.

10. The method according to claim 8 or 9, characterized in that, the first receiving and rotating device (12a) and the second receiving and rotating device (12b) are hindered from moving in the radial direction on their outer circumferences by rolling surfaces (19, 21) that receive radial forces.

11. The method according to claim 8 or 9, characterized in that, the first receiving and rotating device (12a) and the second receiving and rotating device (12b) are supported on each other in the axial direction.

12. The method according to claim 8 or 9, characterized in that, the first receiving and rotating device (12a) and the second receiving and rotating device (12b) are respectively driven by drive elements (14) so as to perform rotation.

13. The method according to claim 8 or 9, characterized in that, the method is carried out by means of the device (10) according to any one of claims 1 to 7.

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