BUSBAR CONNECTION OF TWO DOUBLE BUSBARS

Description

Technical Area

[0001] The present invention relates to a busbar connection of two double busbars. State of the art

[0002] The present invention is described below primarily in connection with vehicle electrical systems. However, the invention can be used in any application in which electrical loads, in particular large electrical loads with significant power ratings of, for example, more than 10 kW or with significant voltages of, for example, more than 100 V, are transmitted.

[0003] In a vehicle's low-voltage electrical system, electrically conductive sheet metal from the body can be used as a ground, thus shortening the length of the return wires. This allows for the elimination of approximately half of all the cables in the vehicle.

[0004] For transmitting large electrical loads, automotive high-voltage systems with, for example, more than 300V or even more than 700V can be used. For automotive high-voltage systems, busbars made of solid metal can be used. When busbars are used, separate positive and negative rails can be employed to ensure the necessary safety (protection against electric shock, arcing, etc.). The positive and negative rails can be configured as a double rail, i.e., lying flat against each other with a small gap (<5mm).

[0005] From US patent publication 5,588,883 A, a connecting device with a fastening ring having an elliptical cross-section and a slot is known.

[0006] Projections are located on the inner surface of the main axle sections of the fixing ring. An outer ring, also with an elliptical cross-section but larger than the fixing ring, is attached around the outer surface of the fixing ring and features a lever. When the fixing ring is initially placed on a post, the secondary axle sections and the projections on the main axle sections contact the outer surface of the post. When the outer ring is rotated 90° clockwise using the lever, the secondary axle sections of the outer ring press against the outer surface of the main axle sections of the fixing ring, forcing them inwards. This tightens the fixing ring and consequently narrows the slot, thus securely fastening the fixing ring to the post.

[0007] From US patent 10,707,621 B2, a connector device and a coaxial connector are known, with which, for example, a cable and an electronic device can be connected. US patent 9490,555 B1 discloses a busbar connection of two double busbars according to the preamble of claim 1. Description of the invention

[0008] One object of the invention is therefore to provide an improved busbar connection between two double busbars using the simplest possible structural means. This object is achieved by the subject matter of the independent claim. Advantageous embodiments of the invention are specified in the dependent claims, the description, and the accompanying figures.

[0009] Even with high-voltage electrical systems up to 1000 volts DC, large electrical currents are required in an electric vehicle to transmit drive power, braking power, or energy recuperation. These current flows generate electromagnetic fields around the vehicle's current-carrying conductors. To reduce or prevent the emission of these fields, the conductors can be shielded. Alternatively or additionally, the positive and negative conductors can be arranged as parallel and close together as possible, since the electromagnetic fields caused by the opposing current flows cancel each other out.

[0010] Even with busbars, the busbar for the positive terminal (or positive potential) and the busbar for the negative terminal (or negative potential) can be arranged very close together by stacking the two busbars on top of each other, perfectly aligned. The stacked busbars are individually electrically insulated. This arrangement can be referred to as a double busbar.

[0011] To maintain the cancellation effect even at contact points, the approach presented here proposes a coaxial contact that allows for the tight guidance of current flows even at the contact point.

[0012] A busbar connection of two double busbars is proposed, wherein the double busbars each have two busbars that are insulated from each other by insulation and stacked on top of each other, wherein the busbars are connected by two concentrically arranged contact systems, each contact system having a first contact for the first busbar and a second contact for the second busbar, as well as a clamping element rotatable between a plug-in position and a clamping position, wherein the contact system is pluggable when the clamping element is arranged in the plug-in position, wherein the first contact and the second contact are arranged coaxially in a plugged state of the contact system, and the clamping element is designed to clamp at least one of the contacts and elastically deform it radially by a rotational movement from the plug-in position to the clamping position.where, in the plugged-in state, the contacts are electrically connected to each other by radial deformation.

[0013] A contact system for two busbars has a first contact for the first busbar and a second contact for the second busbar, as well as a clamping element rotatable between a plug-in position and a clamping position, wherein the contact system is pluggable when the clamping element is arranged in the plug-in position, wherein the first contact and the second contact are arranged coaxially in a plugged-in state of the contact system, and the clamping element is designed to clamp at least one of the contacts and to deform it elastically radially during a rotational movement from the plug-in position to the clamping position, wherein the contacts are electrically connected to each other by the radial deformation in the plugged-in state.

[0014] A busbar connection for two double busbars, wherein the double busbars each have two busbars that are insulated from each other by insulation and stacked on top of each other, can connect the busbars using two concentrically arranged contact systems according to the approach presented here.

[0015] A busbar can be understood as a solid strip of sheet metal. In particular, the busbar can be made of aluminum. Aluminum and aluminum alloys offer good electrical conductivity at low weight and material costs. The busbar can also be made of copper. It can have a rectangular cross-section. The busbar can be elongated and have a length of, for example, more than 0.5 m, preferably more than 1 m, and a width of, for example, between 0.5 cm and 10 cm, preferably between 1 cm and 5 cm. The busbar can also have a thickness of, for example, between 1 mm and 10 mm. The busbar can be insulated on all sides, i.e., encased in insulation. The insulation can be made of, for example, a plastic material. The plastic material can be a thermoplastic.The busbar can be overmolded with thermoplastic. The insulation can have properties designed for automotive high-voltage applications up to 1000 volts DC. In particular, the insulation thickness can ensure dielectric strength against automotive high voltage.

[0016] A double busbar can consist of two busbars with identical dimensions. The two busbars can be stacked on top of each other at their flat sides. The busbars can be aligned. The double busbar can be encased in a plastic material. Alternatively or additionally, the double busbar can be encased in a fabric material. The fabric material can, for example, be wrapped around the busbar as a woven tape. In a contact area, the busbar can be exposed, meaning that, for example, the insulation and sheathing can be removed, at least in some areas. The double busbar can also be additionally shielded against the emission of electromagnetic fields by an electrically conductive sheath.

[0017] Contacts can be made of a metal material. In particular, they can be made of copper. The contacts can have a substantially axially symmetrical basic shape. At least the first contact can have two different diameters. For example, the first contact can be oval-cylindrical. One insertion direction of the contact system can correspond to an axis of symmetry of the contacts. The first and second contacts of a contact system can be referred to as a contact pair.

[0018] A clamping element can also have a substantially axially symmetrical basic shape. The clamping element can also have two different diameters. The clamping element can have at least one point of application for rotation. Depending on the embodiment, the point of application can be located on an outside or an inside of the clamping element. An axis of rotation of the clamping element can coincide with the axis of symmetry of the contacts.

[0019] The first contact can be positioned between the clamping element and the second contact when the connector is plugged in. The clamping element can be designed to change the diameter of the first contact during rotation from the plug-in to the clamped position. This change in diameter allows the first contact to be pressed against the second contact, thereby creating an electrical connection between them. In the pluggable state, a gap may exist between the first and second contacts. This gap can be closed by changing the diameter. Furthermore, changing the diameter allows the first contact to be pressed against the second contact with a defined contact force to achieve low contact resistance.

[0020] The second contact can be located inside the first contact when inserted. The clamping element can surround the first contact from the outside. The clamping element can be designed to reduce the diameter of the first contact and press it against the second contact during the rotational movement from the insertion position to the clamping position. Alternatively, the second contact can surround the first contact from the outside when inserted, and the clamping element can be located inside the first contact. In this case, the clamping element can be designed to increase the diameter of the first contact and press it against the second contact during the rotational movement from the insertion position to the clamping position.

[0021] If the first contact is located outside the second contact and the clamping element is located on the outside of the first contact, a small inner diameter of the clamping element can be smaller than a large outer diameter of the first contact. However, the small inner diameter of the clamping element can also be larger than a small outer diameter of the first contact. A large inner diameter of the clamping element can be larger than the large outer diameter of the first contact.

[0022] If the first contact is located inside the second contact and the clamping element is located on the inside of the first contact, a large outer diameter of the clamping element can be larger than a small inner diameter of the first contact. However, the large outer diameter of the clamping element can also be smaller than a large inner diameter of the first contact. Similarly, a small outer diameter of the clamping element can be smaller than the small inner diameter of the first contact.

[0023] The first contact can be axially slotted to facilitate changes in diameter. A slot in the first contact can prevent the transmission of tensile forces when the first contact is forced apart or provide space for compressing the first contact. The first contact can also be wound from sheet material, leaving an open butt joint between the ends of the sheet material. In particular, the first contact can be doubly slotted. The slots can be diametrically opposed. The second contact can be annularly closed to resist tensile or compressive forces when the diameter of the first contact is changed.

[0024] The clamping element can be electrically conductive and, in the inserted state, can be positioned between the first and second contacts. The clamping element can be designed to press against the first and second contacts during rotation from the inserted to the clamped position, thus electrically connecting the first and second contacts. The clamping element can be annular. Its point of application for initiating the rotation can be located externally and / or internally. If the point of application is external, the first contact can have at least one opening for this point of application. If the point of application is internal, the second contact can have at least one opening for this point of application. The clamping element can also have multiple points of application. These points of application and the openings for them can then be evenly distributed around the circumference of the clamping element.

[0025] The clamping element can have two diametrically opposed thickenings that, during rotation from the insertion position to the clamping position, move between the first and second contacts. The thickenings can be moved into a gap between the first and second contacts, bridging this gap. The thickenings can be slightly wider than the gap to generate a clamping force through elastic deformation of the contacts.

[0026] The clamping element can be rotated 90° during the rotational movement from the plug-in position to the clamped position. This allows the clamping element to assume two unambiguous, easily verifiable positions. Brief character description

[0027] An advantageous embodiment of the invention is explained below with reference to the accompanying figures. They show: Fig. 1 and 2Representations of a contact system according to exemplary embodiments; and Fig. 3 A representation of a busbar connection according to an embodiment of the invention.

[0028] The figures are merely schematic representations and serve only to illustrate the invention. Identical or equivalent elements are consistently identified by the same reference numerals. Detailed description

[0029] For easier understanding, the following description uses reference symbols to the... Figures 1-3 retained as a reference.

[0030] Figs. 1a to 1cFigure 1 shows a representation of a contact system 100 according to an exemplary embodiment. The contact system 100 consists of two pluggable contacts 102 and 104 and a rotatable clamping element 106. The clamping element 106 is designed to clamp and deform the first contact 102 during a rotational movement 108 from a pluggable position 110 to a clamped position 112. This deformation presses the first contact 102 against the second contact 104, establishing a secure electrically conductive connection between the first contact 102 and the second contact 104.

[0031] Contacts 102 and 104 have a substantially hollow cylindrical shape. They are shown in a connected state and, in this state, are arranged coaxially or nested within each other. The clamping element 106 also has at least an annular or hollow cylindrical shape. Here, the first contact 102 is positioned between the clamping element 106 and the second contact 104. The clamping element 106 surrounds the first contact 102 on one outer surface.

[0032] The clamping element 106 has different inner diameters around its circumference. On its inner surface, the clamping element 106 has two opposing flats 114. The flats 114 reduce the inner diameter of the clamping element 106 at this point. The first contact 102 has different outer diameters around its circumference. One outer surface of the first contact 102 is oval. The inner diameter of the uncompressed first contact 102 remains constant around its circumference. The second contact 104 has a constant outer diameter around its circumference. The outer diameter of the second contact 104 is smaller than the uncompressed inner diameter of the first contact 102.

[0033] A large inner diameter of the clamping element 106 is larger than a large outer diameter of the first contact 102. The large outer diameter of the first contact 102 can be at most equal to the large inner diameter of the clamping element 106, since the first contact 102 then rests against the clamping element 106. A small inner diameter of the clamping element 106 at the flats 114 is smaller than the large outer diameter of the first contact 102. A small outer diameter of the first contact 102 is smaller than the small inner diameter of the clamping element 106 at the flats 114. The small outer diameter of the first contact 102 can be at most equal to the small inner diameter of the clamping element 106, since the first contact 102 then rests against the flats.

[0034] The clamping element 106 has on its outer surface a drive geometry 116 for initiating a rotary movement 108 from the insertion position 110 to the clamping position 112. Here, the drive geometry 116 has two opposing parallel surfaces for attaching an open-end wrench or other tool.

[0035] In one embodiment, the first contact 102 is slotted. The first contact 102 has two diametrically opposed slots 118 on its small outer diameter. The slots 118 provide space for the deformation of the first contact 102 and enable deformation by a defined clamping force.

[0036] In Fig. 1aThe clamping element 106 is arranged in the plug-in position 110. The large inner diameter of the clamping element 106 is aligned with the large outer diameter of the first contact 102. The small inner diameter of the clamping element 106 is aligned with the small outer diameter of the first contact 102. The first contact 102 does not contact the second contact 104, or only makes minimal contact. The contact system 100 is thus easily pluggable.

[0037] In Fig. 1bThe clamping element 106 is shown moving from the insertion position 110 to the clamping position 112 during the rotational movement 108. During this movement, the flattened surfaces 114 of the clamping element slide onto the outer surface of the first contact 102 and begin to deform it. This deformation reduces the large outer diameter of the first contact 102. As a direct consequence, the inner diameter of the first contact 102 is also reduced in the area of ​​the large outer diameter, and the inner surface of the first contact 102 is pressed against the outer surface of the second contact 104.

[0038] When the first contact 102 is slotted, the slots 118 narrow due to the deformation of the first contact 102. The first contact 102 begins to touch the second contact 104 in contact areas 120.

[0039] In Fig. 1cThe clamping element 106 is arranged in the clamping position 112. The small diameter of the clamping element 106 is aligned with the former large outer diameter of the first contact 102. The former large outer diameter of the first contact 102 is now equal to the current small inner diameter of the clamping element 106. The current small inner diameter of the clamping element 106 may be larger than the former small inner diameter in the insertion position 110 due to elastic deformation of the clamping element 106 during the rotational movement 108. The first contact 102 and the second contact 104 are firmly in contact with each other in the contact areas 120 in the region of the former large outer diameter of the first contact 102 and are securely electrically connected to each other.

[0040] In one embodiment, the clamping element 106 has been rotated by 90° between the plug-in position 110 and the clamping position 112.

[0041] The Figs. 1a to 1c The contact system 100 shown can also be configured in reverse. The second contact 104 can surround the first contact from the outside. The clamping element 106 is then located inside the first contact 102. During the rotational movement 108 from the insertion position 110 to the clamping position 112, the clamping element 106 pushes the first contact 102 apart until the first contact 102 rests against the inside of the second contact and makes electrical contact with it.

[0042] The Figs. 2a to 2c Figure 1 shows a representation of a contact system 100 according to an exemplary embodiment. The contact system 100 consists as shown in Figure 2. Fig. 1 from the two pluggable contacts 102, 104 and the rotatable clamping element 106. The clamping element 106 is electrically conductive and designed to clamp and electrically connect the first contact 102 and the second contact 104 during the rotational movement from the plug-in position 110 to the clamping position 112.

[0043] In contrast to the embodiment in Fig. 1 The clamping element 106 is arranged here between the first contact 102 and the second contact 104. The first contact 102 is located inside the clamping element 106. The second contact 104 is located outside the clamping element 106.

[0044] The first contact 102 and the clamping element show, as in Fig. 1 Each contact element has two different diameters. In the insertion position 110, the small inner diameter of the contact element 106 is aligned with the small outer diameter of the first contact 102, while the large inner diameter of the clamping element 106 is aligned with the large outer diameter of the first contact 102. When the clamping element 106 is rotated into the clamping position 112, the small inner diameter of the clamping element 106 clamps against the large outer diameter of the first contact 102. This deforms the clamping element 106 and presses it against the inside of the second contact 104.

[0045] In one embodiment, the clamping element 106 also has different outer diameters. The clamping element 106 has a large outer diameter at its small inner diameter. The small inner diameter and the large outer diameter result in a thickening 200.

[0046] In one embodiment, the second contact 104 also has different diameters. A small inner diameter of the second contact 104 is located at the large outer diameter of the first contact 102. During the rotational movement 108 from the insertion position 110 to the clamping position 112, the thickening 200 is inserted between the small inner diameter of the second contact 104 and the large outer diameter of the first contact 102, thereby clamping both the first contact 102 and the second contact 104.

[0047] In one embodiment, the second contact 104 is segmented. The second contact 104 has one segment 202 in the region of the large outer diameter of the first contact 102 and another in the region of the small inner diameter of the second contact 104. Between the diametrically opposed segments 202, the second contact 104 has windows 204. The drive geometry 116 of the contact element 106 is arranged in the windows 204 and is thus accessible from the outside.

[0048] In one embodiment, the contact element 106 has two diametrically opposed points of application 206, or levers, as its drive geometry. Using these points of application 206, the contact element 106 can be rotated back and forth between the plug-in position 110 and the clamping position without tools.

[0049] In Fig. 2a The clamping element is arranged in plug position 110.

[0050] In Fig. 2bThe clamping element is rotated from the plug-in position 110 to the clamping position 112 by the rotary movement 108 and begins to clamp the first contact 102 and the second contact 104.

[0051] In Fig. 2c The clamping element 106 is arranged in the clamping position 112 and clamps the first contact 102 and the second contact 104 in contact areas 120.

[0052] Fig. 3 Figure 1 shows a representation of a busbar connection 300 for two double busbars 302 and 304. The busbar connection 300 is shown in an unplugged state. In the representation, the first of the double busbars 302 is located at the top and can, for simplicity, also be referred to as the upper double busbar. The second of the double busbars 304 is located at the bottom of the representation and can, for simplicity, be referred to as the lower double busbar.

[0053] The double busbars 302 and 304 each have two busbars 306 stacked on top of each other. The busbars 306 of the upper double busbar are electrically insulated from each other by an insulation 308. The insulation 308 also insulates the upper double busbar 302 from the surrounding environment.

[0054] The double busbars 302, 304 have two coaxially arranged contact systems 100 according to the approach presented here. The outer contact system 100 corresponds to the contact system from Fig. 1 The inner contact system 100 corresponds to the contact system from Fig. 2The outer contact system 100 is designed to electrically connect the two opposing busbars 306 of the two double busbars 302, 304. The inner contact system 100 is designed to electrically connect the two opposing busbars 306 of the double busbars 302, 304 through the opposing busbars 306.

[0055] In the illustrated, unplugged state, the first contacts 102 and second contacts 104 of the two contact systems 100 are arranged axially offset from each other.

[0056] In one embodiment, the first double busbar 302 has the first contacts 102 of each of the two contact systems 100. The second double busbar 304 has the second contacts 104 of each of the contact systems 100. The clamping element 106 of the outer contact system 100 is arranged on the first double busbar 302. The clamping element 106 of the second contact system 100 is arranged on the second double busbar 304.

[0057] In one embodiment, the first contact 102 and the second contact 104 of the outer contact system 100 are arranged on opposite flat sides of the two double busbars 302, 304. The outer contact system 100 is configured to connect the opposite busbars 306 of both double busbars 302, 304. The inner contact system 100 is configured to connect the busbars 306 arranged on opposite sides of the double busbars 302, 304.

[0058] In one embodiment, the second contact 104 and the clamping element 106 of the inner contact system 100 are arranged on the rear side of the second double busbar 304, facing away from the first double busbar 302 (downwards in the illustration). Therefore, the first contact 102 of the inner contact system 100 projects axially from the essentially hollow cylindrical first contact 102 of the outer contact system 100. The first contact 102 is long enough that, when the busbar connection 300 is plugged in, it projects into the second contact 104 located on the rear side. Except for a tip area, the first contact 102 is surrounded by a hollow cylindrical insulation 308. When plugged in, the insulation isolates the first contact 102 of the inner contact system 100 from the second contact of the outer contact system 100.

[0059] In other words, a contact system of a rotary terminal plug for a double rail power transmission system is presented.

[0060] In addition to conventional round conductor and single-rail systems, double-rail systems can also be used for transmitting electrical energy in the field of e-mobility, as they offer advantages in terms of lower electromagnetic field radiation due to field cancellation. Field cancellation results from a geometric arrangement of identically aligned rectangular rails positioned as close together as possible. Interfaces with a contacting system are required to connect these double-rail systems to components such as charging sockets, junction boxes, or batteries.

[0061] The present approach introduces a contacting system that establishes, improves and / or secures the electrical connection by rotating certain components around the longitudinal axis of the contacting.

[0062] For EMC reasons, the two potentials of the superimposed rails are guided concentrically into one another. The geometry of the cross-sections is designed such that the potentials to be contacted do not touch, or only minimally touch, during the insertion process, thus eliminating the need for frictional force between the contact partners. Once the contact partners are aligned and have reached their final position relative to each other, a qualified electrical connection is established by a rotational movement of separate components.

[0063] Different operating principles can be used. In one embodiment, at least one of the contact partners can be deformed by a rotating component, such as a spring or a latch. In an alternative embodiment, the contact partners can be electrically contacted by a rotating, electrically conductive component. This electrically conductive component can be referred to as an intermediary.

[0064] With the increasing electrical power demands of e-mobility, the aspect of occupant protection from electromagnetic radiation (ICNIRP) is becoming increasingly important. High-voltage (HV) double-rail systems can transport high amounts of energy while simultaneously emitting low levels of electromagnetic radiation. The rail system requires suitable, externally compatible interfaces. The presented contact system allows the double rail to be used as an interface to the junction box or battery within the installation space.

[0065] The approach presented here enables (almost) forceless positioning of the plug including the rail and, when locked, establishes contact and fixation of the connection without additional tools.

[0066] Since the devices and methods described in detail above are exemplary embodiments, they can be modified to a wide extent by a person skilled in the art in the usual manner; in particular, the mechanical arrangements and the size relationships of the individual elements to each other are merely exemplary. REFERENCE MARK LIST

[0067] 100 Contact system 102 First contact 104 Second contact 106 Clamping element 108 Rotary movement 110 Plug-in position 112 Clamping position 114 Flats 116 Drive geometry 118 Slot 120 Contact area 200 Thickening 202 Segment 204 Window 206 Point of attack 300 Busbar connection 302 First double busbar 304 Second double busbar 306 Busbar 308 Insulation

Claims

1. Busbar connection (300) of two double busbars (302, 304), wherein the double busbars (302, 304) each have two busbars (306) which are insulated from each other by an insulation (308) and are stacked on top of each other to form a stack, characterized in that the double busbars (302, 304) are connected by two concentrically arranged contact systems (100), wherein each contact system (100) has a first contact (102) for the first busbar (306) and a second contact (104) for the second busbar (306), and a clamping element (106) which can be rotated between a plug-connection position (110) and a clamping position (112), wherein the contact system (100) can be plug-connected when the clamping element (106) is arranged in the plug-connection position (110), wherein the first contact (102) and the second contact (104), in a plug-connected state of the contact system (100), are arranged coaxially one in the other and the clamping element (106) is designed to pinch and elastically radially deform at least one of the contacts (102, 104) owing to a rotational movement (108) from the plug-connection position (110) to the clamping position (112), wherein the contacts (102, 104) are electrically conductively connected to each other owing to the radial deformation in the plug-connected state.

2. Busbar connection (300) according to Claim 1, in which the first contact (102), in the plug-connected state, is arranged between the clamping element (106) and the second contact (104), wherein the clamping element (106) is designed to change a diameter of the first contact (102) during the rotational movement (108) from the plug-connection position (110) to the clamping position (112), wherein the first contact (102) is pressed against the second contact (104) by changing the diameter and the first contact (102) is electrically conductively connected to the second contact (104).

3. Busbar connection (300) according to Claim 2, in which the second contact (104), in the plug-connected state, is arranged within the first contact (102) and the clamping element (106) encloses the first contact (102) from the outside, wherein the clamping element (106) is designed to reduce the diameter of the first contact (102) and to press the first contact (102) against the second contact (104) during the rotational movement (108) from the plug-connection position (110) to the clamping position (112).

4. Busbar connection (300) according to Claim 2, in which the second contact (104), in the plug-connected state, encloses the first contact (102) from the outside and the clamping element (106) is arranged within the first contact (102), wherein the clamping element (106) is designed to increase the diameter of the first contact (102) and to press the first contact (102) against the second contact (104) during the rotational movement (108) from the plug-connection position (110) to the clamping position (112).

5. Busbar connection (300) according to any of the preceding claims, in which the first contact (102) is axially slotted in order to simplify changing of the diameter.

6. Busbar connection (300) according to Claim 1, in which the clamping element (106) is electrically conductive and, in the plug-connected state, is arranged between the first contact (102) and the second contact (104), wherein the clamping element (106) is designed to press against the first contact (102) and the second contact (104) and to electrically conductively connect the first contact (102) to the second contact (104) during the rotational movement (108) from the plug-connection position (110) to the clamping position (112).

7. Busbar connection (300) according to Claim 6, in which the clamping element (106) has two diametrically opposite thickened portions (200), which are moved between the first contact (102) and the second contact (104) during the rotational movement (108) from the plug-connection position (110) to the clamping position (112).

8. Busbar connection (300) according to any of the preceding claims, in which the clamping element (106) can be rotated through 90° during the rotational movement (108) from the plug-connection position (110) to the clamping position (112).