WINDING UNIT FOR A CABLE

Description

[0001] The invention relates to a cable drum and in particular a winding unit for a cable for charging an electric vehicle.

[0002] The increasing prevalence of electric vehicles places very specific demands on the necessary infrastructure. This applies not only to a sufficiently large number of charging stations connected to an adequately sized energy grid, but also to everyday and practical issues, such as the handling of individual charging cables for individual vehicles.

[0003] Manufacturers typically supply charging cables with their vehicles, which are usually stored loosely in the trunk, garage, or other storage compartments. When the charging cable is taken out to charge the vehicle at a public charging point, one end is connected to the vehicle via the designated plug, and the other end is connected to the charging station. A large portion of the cable then typically lies on the ground – on the street, sidewalk, parking lot, or, at best, the garage floor. Especially in bad weather, such as rain, snow, or mud, the cable gets wet and dirty and then has to be wound up by hand after charging. This is not only unpleasant but also hygienically questionable, as it poses a significant risk of soiling one's clothing or hands.Manufacturers currently do not offer a truly practical and user-friendly solution for such an impractical handling of charging cables.

[0004] While there are a number of cable drums suitable for winding electrical cables, document DE 10 2009 046 327 A1 describes a device for electrically connecting an electric vehicle to a power outlet. This document also mentions a cable on a winding mechanism driven by two gears. One end of the cable is wound in a relatively wide area, as with a standard cable drum, while the other end emerges from a central section of the drum. This presents several challenges, particularly concerning the current path. Because the long end of the cable rotates the drum during winding and unwinding, special attention must be paid to the transition to a non-rotating section—that is, the part of the cable that emerges from the central point. Generally, only sliding contacts are suitable for this purpose.However, the electrical power required to charge an electric vehicle presents a number of problems with energy transmission through sliding contacts.

[0005] Another solution is described in document DE 10 2011 080 085 A1. This application also concerns a cable drum, specifically for an electric vehicle, where the cable can be wound around or unwound from a core. This avoids sliding contacts and allows the cable to be held in one piece within the drum. However, this document also stipulates that a portion of the cable exits the central area of ​​the drum. This section cannot therefore be used for an axle or for supporting the heavy drum. Furthermore, the inner and outer parts of the cable winding must overlap, resulting in very large dimensions for the drum and a significant amount of the limited storage space available in a vehicle.

[0006] Several documents already exist in this context. For example, document EP 1,477,448 A1 describes a cable reel consisting of a drum with front flanges. There is an additional front flange for securing an extended section of cable. This auxiliary flange has a recess to accommodate a connector section on the cable being wound. Document US 4,053,118 A1 describes a winding unit for winding hose or electrical cable lines without interfering swivel joints for the fluid or electrical circuits involved. As the line is unwound from the drum, an additional section of line is first unwound from a small hub extension next to the drum and then rewound in the opposite direction, so that this internal section of line, located within the drum housing, requires less than one-third the space of the external length being wound and unwound.Furthermore, document WO 2017 / 189372A1 describes a method and a drum design for blowing cables from a drum into an access point in the middle of the span of a cable duct. The cable drum has a central hub, a first flange located near one edge of the central hub, a second flange located near the opposite second edge of the hub, and a third flange located between the first and second flanges.

[0007] Therefore, there is a need for a device for winding and storing charging cables for electric vehicles that overcomes the known disadvantages of the traditionally used technology, is compact, and also enables further improvements in daily use.

[0008] The object of this invention is therefore to present a winding device which is not burdened by the disadvantages of previous charging cables for electric vehicles and in particular has an easy-to-handle, everyday-use design. Brief description of the invention

[0009] The problem described above is solved by the subject matter of the independent claims. Advantageous embodiments of the present invention are described by the dependent claims.

[0010] According to one aspect of the present invention, a winding unit suitable for a charging cable for an electric vehicle is presented. The winding unit comprises a rotationally symmetrical winding unit rotatably mounted about an axis. Furthermore, a rotationally symmetrical inner body is provided, which is rigidly connected to the axis. Additionally, a rotationally symmetrical exit disc is provided, which is rotatably mounted on the axis. The winding unit has a first winding area of ​​a first width, such that a cable can be wound one on top of the other into the first winding area from a region near the axis.The winding unit also has a second winding area in a radial peripheral region of the winding unit. This second winding area is adjacent to the first winding area and has a second width, allowing a cable to be wound side-by-side in the second winding area from a region near the first winding area towards the exit disc, opposite to a winding direction in the first winding area. The second winding area extends over a radial portion of the inner body and can partially enclose it.

[0011] The exit disc can be rotated a predetermined number of revolutions together with the winding unit and then locked, so that a cable can be pushed out of an exit opening in a radially peripheral area of ​​the exit disc at the level of the second winding area as a result of further rotation of the winding unit.

[0012] The presented cable reel features a number of technical effects, advantages, and improvements: Compared to traditional cable reels, both the long part of the cable on one side of the winding unit and the shorter part of the cable on the other side are individually configurable and in no way dependent on the length of the other side of the cable. This is achieved through the special shape inside the winding unit and the cable routing.

[0013] The rotationally symmetrical exit disc can rotate partially freely together with the winding unit, but can also be locked after a certain number of rotations of the winding unit, so that both units – in particular the winding unit and the exit disc – rotate partly together and partly independently. In this way, one end of the cable can be pushed out of an opening in the exit disc. This is usually the shorter part of the cable. It should also be noted that the cable does not necessarily have to exit the exit disc in a central area, but rather in a peripheral area.

[0014] This can be achieved by designing the two winding areas within the winding unit differently. The second winding area is located only in a peripheral region of the winding unit, adjacent to the exit disc. A cable transition piece connects the first and second winding areas. This transition piece is routed inside the winding unit between the first winding area and the inner body. Furthermore, the two ends of the cable are wound in opposite directions within the winding unit.

[0015] An operator can now unwind the long end of the cable from the first winding section by simply pulling on the cable; alternatively, the optional motorized drive can be used. The exit disc rotates along with the winding unit until a predetermined number of revolutions is reached. Then the exit disc is locked – specifically against a stationary part such as the housing of the winding unit, against which the winding unit continues to rotate – so that the cable is automatically pushed out of the exit disc's opening. The second end of the cable is thus automatically made available to the user.

[0016] Because a drive – for example an electric drive – can be located inside the winding unit, in a first winding phase both the short end is wound in the second winding area while the exit disc does not rotate with the winding unit, and the long end is wound in the first winding area.

[0017] In a second winding phase – particularly after the short end of the cable has already been wound – the exit disc rotates together with the winding unit, whereby the long end of the cable is now completely wound in the first winding area. This ensures that both cable ends are optimally and automatically wound – thanks to the electric drive inside the winding unit.

[0018] Furthermore, all elements of the winding unit can be integrated into a single housing, resulting in a very compact unit that is easily stored in a vehicle or other location. The proposed winding unit can therefore be operated both stationary and mobile.

[0019] Additionally, it is easily possible to install a cable cleaning unit both at the cable exit opening and in the area where the long cable end enters the first winding section. This ensures that the cable is always wound clean into the winding unit without the user having to touch or clean it manually. The user simply needs to unplug the connectors from both the vehicle and the charging unit and place them on the ground. The winding process can then be carried out completely autonomously by the winding unit after it has been triggered – for example, electrically.

[0020] By locking the exit disc after a configurable number of revolutions, it can be ensured that the cable is almost completely unwound from winding area 1 before it can be extended from winding area 2. This prevents the cable from being connected until its entire length has been unwound, thus eliminating the risk of thermal overload.

[0021] The optional motorized drive offers the advantage that the cable reel does not need to be lifted and held at waist height, as is practical with manual crank operation. Instead, it can automatically perform the winding process with minimal effort while the user is holding the reel at arm's length.

[0022] Furthermore, by integrating all electrical / electronic components into the static inner body, very good protection against damage from dirt, especially water, can be ensured.

[0023] The following are further examples of the winding unit's design:

[0024] According to an extended embodiment of the winding unit, a cable with a diameter extending from the first winding area between the unit and the inner body into the second winding area and out of the outlet opening can be provided. The cable ends can be fitted with connectors. The presence of the cable makes the winding unit ready for practical use. Because the cable can be inserted into the winding unit or the two winding areas through designated slots, the winding unit and the cable can be purchased from different sources. Furthermore, an existing cable can be made more manageable and enhanced by the winding unit. It is assumed that the winding unit does not need to be supplied together with the cable. Therefore, existing charging cables for electric vehicles can also be retrofitted with the winding unit.

[0025] According to an extended embodiment of the winding unit, the cable can be wound with a first section wound in the first winding area and its second section wound in the opposite direction onto the second winding area. It should be noted that a third short section (i.e., a transition piece) is located inside the winding unit between the first and second sections of the cable and essentially undergoes its winding reversal there.

[0026] According to an advantageous embodiment of the winding unit, the first section can be longer than the second section. In this way, for example, the winding unit can be positioned directly next to the vehicle or the vehicle's charging socket, while the long end of the cable can be connected to the charging station or charging point at a more distant location.

[0027] According to another embodiment of the winding unit, the first width – in particular of the first winding area – can correspond to the cable diameter plus a tolerance width that is smaller than the cable width. This ensures that the cable can wind itself layer by layer into the first winding area without becoming jammed. The cable turns then lie essentially on top of each other.

[0028] According to an alternative embodiment of the winding unit, the first width—in particular, the first winding area—can be wider than the cable diameter. In this case, the cable can be wound side-by-side in several cable widths within the first winding area before transitioning to the next winding level. Advantageously, however, the winding unit would be no more than two to three cable widths wide to ensure orderly winding of the cable. The cable windings would then lie both side-by-side and on top of each other. In this way, despite the compact design, a longer cable section can be wound in the first winding area, making even more distant charging points accessible.

[0029] According to a practical embodiment of the winding unit, the second width – in particular, of the second winding area – can be at least equal to the cable diameter. This allows a cable length of at least the circumference of the second winding area to be wound within it. Alternatively, two to three (or more) cable widths can be provided as winding space in the second winding area, so that the cable length pushed out of the outlet opening of the discharge disc can be correspondingly longer.

[0030] According to a further advantageous embodiment of the winding unit, the cable can be designed for a current rating of at least 11 kW. Furthermore, a design for a higher charging or current rating is possible. This allows various standards for electric vehicle charging cables to be wound using the proposed winding unit.

[0031] According to an extended embodiment of the winding unit, the cable diameter can be at least 16 mm or more – in particular 18 mm. Furthermore, single-phase cables with three conductors or three-phase cables with, for example, five conductors can be used.

[0032] According to a further advantageous embodiment of the winding unit, the inner body can have a smaller diameter in a first region than in a second region, over the radial part of which the second winding region extends. This allows the cable to be wound and unwound essentially one above the other in the first winding region and essentially side by side in the second winding region.

[0033] According to a particularly advantageous embodiment of the winding unit, the winding unit can be rotatably mounted on the first section of the inner body. This part of the inner body thus becomes a bearing and rotation area for the winding unit. Typically, the inner body is rigidly connected to a housing.

[0034] Therefore, and according to a further embodiment of the winding unit, the inner body can be hollow and contain a rotary drive unit for the winding unit. In this way, the winding unit can be driven without manual effort. For this purpose, an electric motor and a power supply – for example, a battery or a power adapter – as well as an electrical and / or electronic control unit can be located inside the inner body.

[0035] Accordingly, and according to a further embodiment of the winding unit, the rotary drive unit can include the electric motor that drives the winding unit relative to the inner body.

[0036] Advantageously, according to a supplementary embodiment of the winding unit, the motor can be switched from outside the inner housing. This can be achieved, for example, by a switch on the housing of the winding unit, a key switch, or similar means. A key switch can also prevent unauthorized persons from starting the drive.

[0037] Furthermore, according to an additional embodiment of the winding unit, the motor can be switched remotely. This can be done via a radio remote control, an NFC (Near Field Communication) connection, a Bluetooth connection, WLAN, or similar.

[0038] According to another elegant embodiment of the winding unit, a locking mechanism between the exit disc and / or the winding unit and / or the inner body can be electromagnetically released from within the inner body. In this way, the exit disc can be locked relative to the inner body or housing after a pre-configured number of rotations, so that only the winding unit can continue to rotate around the inner body, thus pushing the short cable end out of the second winding area through the exit opening.

[0039] According to another practical embodiment of the winding unit, a first cleaning unit can be located in the area of ​​the outlet opening and / or a second cleaning unit can be located in the area of ​​the first winding section. The cable would then run past or through these cleaning sections, thus being cleaned. This would ensure that the cable inside the winding unit is always clean.

[0040] Furthermore, according to one embodiment of the winding unit, the cable with attached connectors at both ends can be inserted into the first winding area, between the first winding area and the inner body, into the second winding area, and out of the outlet opening through respective slots in the winding unit and the outlet disc. In this way, the winding unit and the cable could be sourced from different suppliers. An existing cable could also be connected to the proposed winding unit without having to remove one or both connectors.

[0041] A supplementary embodiment of the winding unit may provide an additional housing with openings for both ends of the cable, which would at least enclose the winding unit. Furthermore, the housing could ensure that the winding unit stands securely on the ground.

[0042] Further advantages and features of the present invention will become apparent from the following exemplary description of currently preferred embodiments. The individual figures in the drawings of this application are to be regarded merely as schematic and not to scale. Brief description of the characters

[0043] The following are preferred embodiments described by way of example and with reference to the following figures: Fig. 1 represents an embodiment of the winding unit according to the invention for a cable for charging an electric vehicle. Fig. 2 schematically shows a cross-section through part of the winding unit. Fig. 3 shows a side view of the exit disc from which the cable is pushed out or wound up. Fig. 4 shows how the cable is guided from the first winding area to the second winding area. Detailed description of implementation examples

[0044] The following terms and expressions are used in this document:

[0045] The term "electric vehicle" describes any vehicle equipped with an electric drive. This includes electric cars, electric vans, electric motorcycles, electric scooters, and also electric trucks, as well as electric boats, aircraft, and electric rail vehicles. Other electrically powered vehicles are not excluded.

[0046] The term "inner body" describes a rotationally symmetrical body located inside the winding unit and at least partially enclosed by it. The portion of the inner body with the smaller diameter can serve as a counter bearing for the winding unit. A ball bearing, a double ball bearing, a roller bearing, or a plain bearing can be located between the two. The inner body can be either solid or hollow. If it is hollow, it can be closed with covers on one or both sides. This allows for easy maintenance, for example, on the internal electric motor. The narrow part of the inner body can serve as the pivot point for the winding unit. The inner body can also have a pin in the center of the wider side (e.g., on the cover), allowing it to also serve as the axle for the exit disc.Other axis guides are conceivable - e.g. starting from a housing of the winding unit.

[0047] The term "winding unit" describes an essentially rotationally symmetrical element of the winding unit, which has a first winding area and a second winding area. A cable can be guided to the second winding area through an opening in a side wall of the first winding area, which points towards the inner body.

[0048] The term "exit disc" describes a ring-shaped element with an exit opening. The exit disc should have a diameter at least equal to the size of the second winding section of the winding unit plus, for example, twice the cable diameter. The exit disc can also be designed as a circular disk or have a detachable inner section that can be mounted on a shaft. Furthermore, the exit disc can be locked to prevent rotation of the winding unit. This can be achieved either by a locking pin (which can also be inserted manually) or, alternatively, for example, electromagnetically from within the inner body. An electromagnet can advantageously actuate the locking mechanism.

[0049] The term "exit opening" describes an opening in the exit disc through which the cable can be pushed out. Typically, this pushing out occurs essentially in a tangential direction to a surface of the exit disc.

[0050] The term "cable" describes a multi-core electrical cable designed for power transmission of at least 11 kW or at least 16 A at 240 V. Such cables typically have a diameter of approximately 2 cm (especially 1.8 cm). However, the winding unit can also be designed for cables with smaller and significantly larger diameters.

[0051] The term "rotational drive unit" describes an essentially electrically operated unit - such as an electric motor with an associated battery that can supply the motor with electrical energy - so that the winding unit can be driven relative to the inner body and set into rotation.

[0052] The term "cleaning unit" describes a device located near the exit opening of the winding cylinder, past or through which the cable can be guided. The cleaning unit consists, for example, of brushes and / or sponges to ensure the cable is cleaned during winding. The cleaning unit can be located either directly on the winding cylinder or in a housing that encloses the winding unit. A cleaning unit may also be present at the first winding section.

[0053] It should be noted that features or components of different embodiments that are identical or at least functionally equivalent to the corresponding features or components of the embodiment are largely provided with the same reference numerals or with a different reference numeral that differs only in its first digit from the reference numeral of a (functionally) corresponding feature or component. To avoid unnecessary repetition, features or components already explained with reference to a previously described embodiment will not be explained in detail again later.

[0054] Furthermore, it should be noted that the embodiments described below represent only a limited selection of possible embodiments of the invention. In particular, it is possible to combine the features of individual embodiments in a suitable manner, such that a multitude of different embodiments are to be considered obviously disclosed to the person skilled in the art with the embodiments explicitly presented here.

[0055] Fig. 1 Figure 1 represents an embodiment of the winding unit 100 according to the invention for a charging cable for an electric vehicle. The winding unit 100 has a rotationally symmetrical winding unit 102, which is rotatably mounted about an axis (not shown), a rotationally symmetrical inner body 104, which is fixedly connected to the axis, and a rotationally symmetrical exit disc 106, which is rotatably mounted about the axis.

[0056] The winding unit 102 has a first winding area 108 of a first width, such that a cable 110 can be wound one on top of the other into the first winding area 108 from an area near the axis. The winding unit also has a second winding area 112 in a radial peripheral area of ​​the winding unit 102 (shown schematically without cable), wherein the second winding area 112 is arranged adjacent to the first winding area 108 and has a second width, such that the cable 110 can be wound side by side in the second winding area 112 from an area near the first winding area 108 in the direction of the exit disc 106, opposite to a winding direction in the first winding area 108. The second winding area 112 extends radially over a portion of the inner body 104.

[0057] The exit disc 106 rotates a predetermined number of revolutions together with the winding unit 102 and can then be locked, so that the cable 110 can be pushed out of an exit opening 114 in a radially peripheral area of ​​the exit disc 106 at the level of the second winding area 112 as a result of a further rotation of the winding unit 102.

[0058] The arrows from the exit disc 106 towards the inner body 104 are only intended to indicate that the exit disc 106 is normally located close to the inner body 104 immediately before the second winding area 112 when assembled.

[0059] Fig. 2Figure 1 schematically shows a cross-section 200 through part of the winding unit. The first winding section 108 is clearly visible, in which the cable 110 is wound in layers one on top of the other. The inner body 104 and the exit disc 106, from whose exit opening 114 the cable 110 can emerge, are also visible. This figure also shows that the cable is wound side by side in the second winding section 112 if there are multiple turns. The cable 110 leaves the first winding section 108 in a lower region of the winding section 108 – that is, near the narrower part 202 of the inner body 104 – and is guided into the second winding section 112 via a short connecting piece 206 in a cavity 204 between the first winding section 108 and the inner body 104, where it is wound in the opposite direction to the first winding section.

[0060] As opposed to Figure 1The inner body 104 is now shown closed on the left side. This can be achieved by a left-side cover for the inner body 104. An electric drive motor 216, a battery 214, a remote control receiver, and other control electronics 218 can be housed inside the inner body 104. Furthermore, the electrical components or electronics within the inner body 104 can be routed out via a cable connection near the schematically depicted axis 208, for example, in area 210 of the inner body 104. This applies both to a charging current for the battery (not shown) and to necessary control signals. A bearing or plain bearing 212 is also shown between the winding unit 102 and the inner body 104.

[0061] Fig. 3Figure 300 shows a side view of the outlet disc 106, from which the cable 110 can be pushed out in the direction of arrow 302 and also retracted in the opposite direction. Partial illustration 304 repeats the relevant section for the outlet opening 114 from the outlet disc 106. Figure 2 .

[0062] Detail 308 shows another cross-section from above of side view 300. Here it is clearly visible how the cable 110 can be pushed out of the outlet opening 114 almost tangentially over the second winding area. The cleaning unit 306, through which the cable 110 passes, should also be mentioned. This ensures that a cleaned cable 110 is always present inside the winding unit.

[0063] In Fig. 4is shown (400) how the cable 110 is guided from the first winding area near the narrower part 202 of the inner body 104 in the area between the first winding area (not shown) and the second winding area (not shown directly), so that there is an opposite winding direction in the first winding area and the second winding area.

[0064] The description of the various embodiments of the present invention has been provided for better understanding, but does not serve to directly limit the invention as defined in the claims.

[0065] The structures, materials, processes and equivalents of all means and / or steps with associated functions described in the claims below are intended to apply all structures, materials or processes as expressed in the claims.

[0066] In summary, a cable winding unit – essentially a cable drum – is presented, the exit disc of which can be partially blocked from rotating with the winding unit, so that one cable end is pushed out of the exit opening. Simultaneously, the other end of the cable is unwound from a first winding section of the winding unit. A cleaning unit located near the exit openings, for example, in the housing of the winding unit, ensures that only clean cable is wound into the unit. Winding and unwinding can be electrically driven. Reference symbol list :

[0067] 100 Winding unit 102 Winding unit 104 Inner body 106 Exit disc 108 First winding area 110 Cable 112 Second winding area 114 Exit opening 200 Cross-section through the winding unit 202 Narrow area of ​​the inner body 204 Cavity between the first winding area and the inner body 206 Section of cable between first and second winding area 208 Symbolic axis 210 Area of ​​the inner body 212 Bearing or slide bearing 214 Battery 216 Motor 218 Control electronics 300 Side view of the exit disc 302 Cable exit direction 304 Partial representation of Fig. 2 306 Cleaning unit 308 Detailed view 400 View of the counter-rotating winding of the cable

Claims

1. A winding unit (100) for a cable for charging an electric vehicle, the cable reel unit (100) comprising - a rotationally symmetrical winding unit (102) rotatably mounted on an axis, - a rotationally symmetrical inner body (104) fixedly connected to the axis, - a rotationally symmetrical outlet ring (106) rotatably mounted on the axis, wherein the winding unit (102) has a first winding area (108) of a first width, such that a cable (110) is woundable in the first winding area (108) on top of itself from an area close to the axis, wherein the winding unit (102) has a second winding area (112) in a radial peripheral area of the winding unit (102), wherein the second winding area (112) is arranged adjacent to the first winding area (108) and has a second width, such that a cable (110) is woundable side by side in the second winding area (112) from an area near the first winding area (108) in the direction of the exit ring (106) in a direction opposite to a winding direction in the first winding area (108), and wherein the second winding area (112) extends over a radial portion of the inner body (104), wherein the exit ring (106) is rotatable together with the winding unit (102) for a predetermined number of revolutions and then locked, such that a cable (110) is pushable out of an exit opening (114) in a radially peripheral region of the exit ring (106) as a result of further rotation of the winding unit (102) (106) at the level of the second winding area (112) as a result of further rotation of the winding unit (102).

2. The winding unit (100) according to claim 1, wherein - a cable (110) having a cable diameter extends from the first winding area (108) between it and the inner body into the second winding area (112) and out of the exit opening (114).

3. The winding unit (100) according to claim 2, wherein the cable (110), in a wound state, is wound with a first section in the first winding area (102) and with its second section wound in the opposite direction on the second winding area (112).

4. The winding unit (100) according to claim 2 or 3, wherein the first section is longer than the second section.

5. The winding unit (100) according to claims 2 to 4, wherein the first width corresponds to the cable diameter plus a tolerance width that is smaller than the cable width.

6. The winding unit (100) according to claims 2 to 4, wherein the first width is wider than the cable diameter.

7. The winding unit (100) according to claims 2 to 6, wherein the second width corresponds at least to the cable diameter.

8. The winding unit (100) according to claims 2 to 7, wherein the cable (110) is designed for a power throughput of at least 11 kW, wherein the cable diameter is at least 16 mm.

9. The winding unit (100) according to any of the preceding claims, wherein the inner body (104) has a first region with a smaller diameter than in a second region, over the radial portion of which the second winding region (112) extends.

10. The winding unit (100) according to claim 9, wherein the winding unit (102) is rotatably mounted on the first portion of the inner body (104).

11. The winding unit according to any of the preceding claims, wherein the inner body (104) is hollow and comprises a rotational drive unit for the winding unit (100).

12. The winding unit (100) according to claim 11, wherein the rotational drive unit comprises a motor that drives the winding unit (102) relative to the inner body (104) and / or wherein the inner body (104) houses a rechargeable battery for operating the motor, and / or wherein the motor is switchable from outside the inner body (104) and / or wherein the motor is switchable remotely.

13. The winding unit (100) according to claim 11 or 12, wherein a lock between the exit ring (106) and the winding unit (108) and / or the inner body is activatable electromagnetically from within the inner body (104).

14. The winding unit (100) according to one of the preceding claims, additionally comprising a first cleaning unit (306) in the area of the outlet opening (114) and / or a second cleaning unit in the area of the first winding area (102).

15. The winding unit (100) according to one of the preceding claims, wherein a cable (110) with plugs mounted at both ends is guided into the first winding area (108), between the first winding area (102) and the inner body (104), into the second winding area (112) and out of the exit opening (114) through respective slots in the winding unit (102) and the exit ring (106).