High-current plug connector

Abstract

The invention relates to a plug connector for transmitting a current, in particular a current greater than 100 A. The plug connector comprises a sword-shaped part and a clamping part. In this case, the sword-shaped part is designed to be inserted into the clamping part in an engagement direction in order to form the plug connector. In addition, the sword-shaped piece has the hardness smaller than that of the clamping piece. The clamping element has a first contact piece, which is designed to be engraved into a first main surface of the sword-shaped element, and a second contact piece, which is designed to be engraved into a second main surface of the sword-shaped element. In this case, the first main surface is oriented parallel to the second main surface in the joining direction.

Description

Technical Field

[0001] The invention relates to a plug connector for transmitting electric current, in particular electric currents greater than 100 A. Background Art

[0002] Cold plug connectors for applications with currents exceeding 100 A are becoming increasingly important due to the increasing degree of electrification. Their advantages over other connection technologies include, among other things, the inexpensive and easy production of components (punching and bending), short joining times, low process and equipment costs, and the ability to join multiple connectors simultaneously.

[0003] The challenge of such a connection is to produce the lowest possible contact resistance while being able to produce it easily and cost-effectively and to ensure the longest possible current-carrying capacity. In particular, blind connection of the plug connector should be possible by improving tolerance compensation. Summary of the Invention

[0004] The plug connector according to the invention, having the features of claim 1, has the advantage that a reliable plug connection is formed while the components of the plug connector can be easily and cost-effectively manufactured and connected. This is achieved according to the invention in that the plug connector comprises a sword and a clamping part, wherein the sword is designed to be inserted into the clamping part along a particularly linear joining direction to form the plug connector. The sword thus forms the male connector and the clamping part forms the female connector. A long connector is considered a sword, having a high ratio of width to depth. The sword has a lower hardness than the clamping part. "Hardness" refers to the mechanical resistance of a material to mechanical impact by other objects. Hardness can be determined using one of the common hardness testing methods, for example, the Martens, Rockwell, or Brinell hardness tests. The clamping part has a first contact tab and a second contact tab, wherein the first contact tab is designed to be inscribed into a first main surface of the sword, and the second contact tab is designed to be inscribed into a second main surface of the sword. Here, the first main surface is oriented parallel to the second main surface along the joining direction. The first contact tab and the second contact tab are preferably engraved into the sword-shaped part at a depth of 10 μm to 20 μm respectively. In particular, the first contact tab and the second contact tab are engraved into the first main surface and the second main surface of the sword-shaped part due to an interference fit. Here, the oxide layer in the contact area between the first and second contact tabs and the sword-shaped part is preferably broken, thereby creating an airtight connection between the sword-shaped part and the clamping part. The first and second contact tabs are preferably rounded at the contact edges to enable a uniform and reproducible joining process. Due to the plastic deformation of the sword-shaped part, the plug connector can preferably only be used for one plugging and unplugging cycle, but can also be plugged and unplugged multiple times when the sword-shaped part is replaced. The clamping part and the sword-shaped part are preferably sheet metal components and are preferably made of a highly conductive material, the sword-shaped part being made of, for example, CuFe2P, CuCrSiTi or CuSn6, and the clamping part being made of CuSn0.15. In particular, the clamping element is preferably a stamped and bent component produced without a cohesive connection. This provides a plug connector which, due to the contact tabs cut into the blade, achieves low contact resistance for transmitting high currents and ensures a high current-carrying capacity over the service life of the plug connector.

[0005] The dependent claims indicate preferred developments of the invention.

[0006] Furthermore, it is preferred that the sword has at least one chamfer, in particular four chamfers, at the distal end. This makes it easier for the sword to be self-centered and introduced into the clamping piece and the reduction of the joining forces.

[0007] The sword preferably has a plastic injection-molded encapsulation that is designed to contact the clamping element so that the sword is oriented in the clamping element. The plastic injection-molded encapsulation is preferably made of a suitable insulating plastic that is adapted to the conditions of use. Furthermore, preferably, holes are provided in the sword to better integrate and secure the plastic injection-molded encapsulation in the sword. The plastic injection-molded encapsulation allows the sword to be insulated from the surrounding components and further improves the joining process. Furthermore, the plastic injection-molded encapsulation prevents the sword from tilting in the clamping element, for example, under vibration loads. The plastic injection-molded encapsulation can also increase the rigidity of the sword.

[0008] Furthermore, the clamping element preferably has a first centering tab and a second centering tab, which are configured to contact a first side region and an opposite second side region of the sword. The first and second side regions are preferably arranged perpendicular to the main surface, and the first and second centering tabs are arranged perpendicular to the first and second contact tabs. The centering tabs enable the sword to be automatically centered in the clamping element. An interference fit or a transition fit is preferably provided between the first and second centering tabs and the sword.

[0009] It is particularly preferred that the first side region and / or the second side region have a centering region and a recessed region oriented toward the longitudinal axis of the sword. The centering region is preferably located at the distal end of the sword. There is preferably an interference fit or a transition fit between the centering region and the centering tab, while there is a clearance fit between the recessed region and the centering tab. As a result, the first and second centering tabs come into contact with the sword only at the moment when the position of the clamping element relative to the sword is defined.

[0010] Furthermore, it is preferred that the first and second centering tabs are arranged offset relative to the first and second contact tabs in the joining direction, so that the first and second centering tabs do not contact the sword simultaneously with the first and second contact tabs. This allows the joining process of the electrically connected contact tabs to be separated from the lateral centering tabs. The sword is initially aligned with the clamping element. As the sword further enters the clamping element, the contact tabs can enter the sword without the centering tabs negatively affecting the joining force. This also facilitates process monitoring of the joining process.

[0011] According to another preferred design of the present invention, the clamping piece has a clamping box, which in particular has four bends perpendicular to the central axis, so that the clamping box of the clamping piece has a basically closed, hollow cross-section perpendicular to the central axis. Therefore, the clamping box forms a joint gap, which is set up to accommodate the sword-shaped piece. The central axis is arranged centrally in the clamping box along the joining direction. "Basically closed" means that the first and second circumferential side ends of the clamping box are in contact with each other or separated from each other by a fine gap, but are not connected in a material-locked manner. As a result, a narrow contact gap can also exist between the first and second circumferential side ends. It is particularly preferred that the cross-section is basically rectangular, wherein the edges are rounded by the bends. As a result, a clamping piece with a joint gap can be obtained at low cost.

[0012] The bent portion preferably has an undercut. The undercut is provided in the clamping region, in particular at the inner bending radius. This prevents the formation of burrs in the bending region after the bending process. The undercut preferably has a depth of between 0.05 and 0.2 mm, in particular 0.1 mm.

[0013] Furthermore, the clamping box preferably has at least one groove designed to contact the sword. The clamping box preferably has two grooves on both long sides, which extend perpendicularly to the joining direction. These grooves stiffen the clamping box and reduce its bulging. The sword can preferably be supported against the groove by means of the overmolding, so that the groove can serve as an additional centering and supporting element.

[0014] The clamping box particularly preferably has at least one reinforcement that forms an insertion bevel for the sword. Preferably, the reinforcement is arranged on a long side of the clamping box opposite the first and second contact tabs. It is particularly preferred that the clamping box have two opposing reinforcements. These reinforcements can further reduce bulging. Furthermore, the reinforcements contribute to improved self-centering and the joining process.

[0015] The clamping box preferably includes a closing tab at the first circumferential end, wherein the closing tab is designed to absorb radial forces from the second circumferential end. The closing tab makes it possible to easily and cost-effectively reduce bending of the clamping box. The closing tab is preferably combined with a supporting shoulder at the second circumferential end, which supports the first end and is designed to absorb torsional forces acting on the clamping box by the first and / or second contact tabs.

[0016] Preferably, the first and second clamping tabs have smooth-cut areas pointing inward perpendicular to the central axis, and the bend has a smooth-cut area pointing outward perpendicular to the central axis. The cut edge of the stamped component has a stretching area, a smooth-cut area, and a tearing area along the stamping direction. Burrs may form in the tearing area. The smooth-cut areas are burr-free, allowing the clamping part to be floatingly supported on the bend by providing the smooth-cut areas in the outer area of ​​the bend, thereby reducing the risk of jamming during self-centering. The smooth-cut areas are arranged in the inner area of ​​the clamping tabs, which ensures a high-quality contact surface and increases process reliability during the joining process.

[0017] Particularly preferably, the clamping member comprises two first contact strips and two second contact strips. Here, the two first contact strips and the two second contact strips are preferably arranged relative to each other. Thus, a high-quality electrical connection between the sword-shaped member and the clamping member can be reliably established.

[0018] Furthermore, the plug connector preferably includes a clamping element housing having a sliding surface on which the clamping element is supported in a floating manner perpendicular to the joining direction. The clamping element is preferably supported in a floating manner perpendicular to the joining direction in the clamping element housing. This allows the clamping element to be pre-positioned and provides sufficient clearance for the clamping element to achieve self-centering. Furthermore, the clamping element housing securely accommodates the clamping element and isolates the clamping element and the sword from adjacent components.

[0019] The clamping element is preferably supported in a floating manner on the sliding surface of the clamping element housing in the region of the bend via a clamping box. This, in particular in combination with an outwardly directed smooth cutting area and / or an undercut in the bend, allows for good sliding properties between the clamping element and the clamping element housing, which positively influences self-centering. Furthermore, the clamping element housing can reliably absorb the joining forces transmitted from the blade to the clamping element via the sliding surface.

[0020] Furthermore, it is preferred that the clamping part housing is an injection-molded component, which can be produced cost-effectively and has good insulating properties.

[0021] The clamp housing preferably has a hook that secures the clamp in the clamp housing against the direction of engagement. The hook prevents the clamp from falling out of the clamp housing during assembly. Furthermore, the hook facilitates easy installation of the clamp in the clamp housing.

[0022] The clamping element preferably includes a welding tab that can be connected to a flexible conductor in a material-locking manner. For example, the flexible conductor can be welded to an output wire of a motor winding. The flexible conductor is preferably a litz wire. Connecting the clamping element via the flexible conductor allows for mechanical release of the plug connector and tolerance compensation during the joining process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] Figure 1 shows a perspective view of a sword-shaped member of a plug connector according to a first embodiment of the present invention,

[0025] Figure 2 shows a perspective view of a clamping member of a plug connector according to a first embodiment of the present invention,

[0026] Figure 3 shows a perspective view of a clamping housing of a plug connector according to a first embodiment of the present invention,

[0027] Figure 4 A first sectional view shows a plugged-in plug connector according to a first embodiment of the present invention,

[0028] Figure 5 A second sectional view shows the plugged-in plug connector according to the first embodiment of the invention,

[0029] Figure 6 Three schematic detail views showing the pressing process of a sword into a clamping element according to a first exemplary embodiment of the invention,

[0030] Figure 7 shows a schematic bottom view of a clamping member according to a first embodiment of the present invention, and

[0031] Figure 8 A schematic detail of the punched edge is shown. DETAILED DESCRIPTION

[0032] Preferably, all identical components, elements and / or units are provided with the same reference numerals in all figures.

[0033] Refer to the following Figures 1 to 8 A plug connector 100 according to a first preferred embodiment of the present invention will be described in detail.

[0034] Figure 1The sword 10 is shown, which forms the male part of the plug connector 100. The sword 10 is a sheet metal component with an elongated geometry that extends along the longitudinal axis XX. The width of the sword 10 is significantly greater than its depth, so that the sword 10 has a first main face 11 and an opposite second main face 12 (at Figure 1 The first main surface 11 and the second main surface 12 are connected in the lateral direction by a first side region 16 and a second side region 17 .

[0035] The sword 10 can be introduced into the clamping element 30 in order to produce a plug connection along a linear joining direction F. The joining direction 11 extends parallel to the longitudinal axis XX and points in the direction of the distal end 14 of the sword 10 .

[0036] A plastic overmold 15 is attached to the sword 10. It surrounds the sword 10 and has a projection 20 that extends toward the distal end 14. The end of the projection 20 is beveled by a chamfer 21. The plastic overmold 15 increases the rigidity of the sword 10 and improves its self-centering during the joining process. Furthermore, the plastic overmold 15 insulates the sword 10 from adjacent objects.

[0037] The sword 10 has two long chamfers 13 and two short chamfers 13 at its distal end 14. Preferably, the chamfers 13 have an angle of 20° relative to the longitudinal axis XX. The chamfers 13 increase the self-centering of the plug connection and reduce the joining forces.

[0038] The centering region 18, which adjoins the two short chamfers 13 at the first side region 16 and the second side region 17, respectively, represents the maximum width of the sword 10. A recessed region 19 adjoins the centering region 18 opposite the joining direction 11. The recessed region 19 is recessed inwardly toward the longitudinal axis XX, so that the sword has a smaller width in the recessed region 19 than in the centering region 18.

[0039] Figure 2 A clamping element 30 according to a first preferred embodiment is shown. The clamping element 30 forms the female part of the plug connector 100 and is designed to receive the sword 10.

[0040] exist Figure 2 In the embodiment, the clamping part 30 is implemented as a stamped and bent part, which is made of a sheet metal with a constant wall thickness. The sheet metal is preferably a copper sheet with high electrical conductivity.

[0041] The clamping element 30 has a clamping box 35 which has four 90° bends 36 in the direction of the center axis YY, so that a first peripheral end 39 and a second peripheral end 40 are in contact and the clamping box forms a joint gap 45 in its center. The joint gap 45 is designed to receive the sword 10 in order to form the plug connector 100. The center axis YY is arranged centrally in the joint gap 45 and is oriented parallel to the joining direction F.

[0042] The clamping box 35 has a clamping region 48 at one end along the joining direction F. The clamping box 35 has an opening 47 at the end opposite the clamping region 48 , which is provided for receiving the sword 10 .

[0043] The first end 39 has a closing tab 41 which abuts against the outer side of the second circumferential end 40 and prevents radial bending of the clamping box 35. In addition, the second circumferential end 40 has a supporting shoulder 46 in the region of the opening 47, which ensures that the second circumferential end 40 can be supported on the first circumferential end 39 during the joining process and absorbs torsional forces from the clamping area 48.

[0044] The cross section of the clamping box 35 perpendicular to the center axis YY has two opposite long sides and two opposite short sides. The clamping box 35 has a groove 37 on the surface of each long side, which is bent inward toward the center axis YY and extends perpendicular to the joining direction F. The groove 37 reduces the curvature of the long sides of the clamping box 35 and can also serve as a centering and supporting element.

[0045] Furthermore, the clamping box 35 has a reinforcement 38 in the region of the opening 47, on each of the two long sides. The reinforcement 38 extends along the entire long side of the clamping box 35 and is bent outward from the joining gap 45. The reinforcement 38 thus forms an insertion bevel that improves the self-centering of the sword 10 in the clamping part 30 and the joining process. Furthermore, the reinforcement 38, together with the groove 37, reduces the bulging of the clamping box 35.

[0046] In the clamping region 48, two first contact webs 31 are arranged on one long side of the clamping box 35, and two second contact webs 32 are arranged on the opposite long side. The first contact webs 31 and the second contact webs 32 extend from the clamping box 35 parallel to the joining direction F and are bent toward the joining gap 45.

[0047] Furthermore, a first centering tab 33 is arranged on one short side and a second centering tab 34 is arranged on the opposite short side in the clamping region 48 of the clamping box 35. The first centering tab 33 and the second centering tab 34 also extend from the clamping box 35 parallel to the joining direction F and are bent in the direction of the joining gap 45.

[0048] In the region of the opening 47 , a welding lug 43 is attached to the clamping box 35 on a short side, which welding lug can be connected to a flexible conductor 44 in a materially bonded manner.

[0049] exist Figure 3 , a clamping element housing 50 is shown, which has a box-shaped hollow shape and is configured to receive the clamping element 30. The wall thickness of the clamping element housing 50 is substantially constant.

[0050] The clamp housing 50 has four bases with sliding surfaces 51 in its interior, which are arranged in the corners of the interior. The sliding surfaces 51 are oriented perpendicular to the joining direction F so that the curved portion 36 of the clamping cassette 35 can rest on the sliding surfaces 51. Sufficient clearance is provided between the clamp housing 50 and the clamping element 30 so that the clamping element 30 is supported in a floating manner perpendicular to the joining direction F in the clamp housing 50, thereby ensuring reliable self-centering.

[0051] The clamping part housing 50 is an injection-molded component made of plastic. Therefore, further functions can be integrated into the clamping part housing 50, so as to integrate the clamping part housing 50 into a structural assembly, for example.

[0052] A latching hook 52 is incorporated into the wall of the box-shaped clamp housing 50 , which is designed to contact the clamp 30 at the opening 47 in order to fix the clamp 30 counter to the joining direction F in the clamp housing 50 .

[0053] Figure 4 The cross-section of the plug connector 100 in the plugged-in state is shown along the longitudinal axis XX and perpendicular to the first main face 11 of the sword 10 . The plug connector 100 comprises the sword 10 , the clamping element 30 and the clamping element housing 50 .

[0054] The cross-sectional view of plug connector 100 shows that sword 10 has been inserted into clamping element 30, with first contact tab 31 being cut into first main surface 11 of sword 10 and second contact tab 32 being cut into second contact surface 12 of sword 10, thereby forming a force-locking and form-locking connection. During the joining process, the forces exerted on sword 10 by first and second contact tabs 31, 32 break open the oxide layers on the surface of sword 10 and on contact tabs 31, 32 in the contact area. This allows for a gas-tight connection with low contact resistance to be formed between clamping element 30 and sword 10.

[0055] The sword has a plastic injection coating 15 that can be supported on the groove 37. Two holes are formed in the sword 10, which facilitate the installation and fixing of the plastic injection coating 15. The plastic injection coating 15 has two chamfers 21, which help to center the sword 10 in the clamping part 30.

[0056] The clamping part 30 rests with its bend 36 in a floating manner on the sliding surface 51 of the clamping part housing 50. A minimum distance is provided between the outer periphery of the clamping part 30 and the inner periphery of the clamping part housing 50, which enables the clamping part 30 to be floatingly supported perpendicular to the joining direction F.

[0057] Figure 5 A second section of the plug connector 100 in the plugged state is shown along the longitudinal direction XX and parallel to the first main face 11 of the sword 10. The sword 10 is mounted centrally in the clamping part 30, so that an electrical connection is formed between the sword 10 and the clamping part 30.

[0058] The first centering tab 33 and the second centering tab 34 already center the sword 10 in the center of the clamping element 30 during the joining process. To this end, the clamping element 30 can be moved inside the clamping element housing 50 perpendicular to the joining direction F. Alternatively, the sword 10 can be aligned perpendicular to the joining direction F with respect to the clamping element 30.

[0059] Figure 5 The cross section of the welding lug 43 is shown, in which a flexible conductor 44 is arranged. The flexible conductor 44 is preferably a litz wire that is welded to the welding lug 43 and connects the plug connector 100 to the motor winding, for example. The contact of the flexible conductor 44 enables the clamping part 30 to move in the clamping part housing 50 as unimpeded as possible.

[0060] The clamping element housing 50 has a hook 52 which secures the clamping element 30 in the clamping element housing 50 opposite to the joining direction F. The hook 52 is functionally integrated into the clamping element housing 50 and can be bent perpendicularly to the joining direction F. Thus, the hook 52 can be bent outward in order to arrange the clamping element 30 in the clamping element housing 50. By bending the hook 52 outward, the clamping element 30 can also be removed from the clamping element housing 50.

[0061] Figure 6 The three schematic detail views show the sequence of the joining process in the region of the second centering tab 34 of the distal end 14 of the sword 10. Here, the region of the first centering tab 33 and the first side region 16 is symmetrically designed relative to the region of the second centering tab 34 and the second side region 17.

[0062] As in Figure 6It can be seen from the view of FIG that the second centering web 34 is arranged offset relative to the first contact web 31 in the direction of the joining direction F. This allows the second centering web 34 and the first contact web 31 to be inserted separately in time, which facilitates process monitoring of the joining process.

[0063] exist Figure 6 In the first view, the sword 10 enters the clamping part 30, wherein the second centering tab 34 contacts the sword 10 in the centering region 18 of the second side region 17. In this case, the second centering tab 34 exerts a lateral force on the sword 10, which centers it in the clamping part 30.

[0064] exist Figure 6 In the second view, the sword 10 is aligned with the clamping element 30 and is further inserted into the clamping element 30 along the joining direction F. Here, the second centering tab 34 loses contact with the sword 10 due to the recessed area 19, wherein the first contact tab 31 comes into contact with the sword 10. The chamfer 13 of the sword 10 ensures that the joining force continuously increases after the first contact tab 31 makes contact.

[0065] Figure 6 The third view shows the sword 10 in the engaged position in the clamping element 30. Here, the first contact tab 31 is already engraved into the first main surface 11 of the sword 10 and forms an electrical contact. The second centering tab 34 is arranged at the level of the recessed area 19 without contact with the sword 10.

[0066] Figure 7 The clamping element 30 is shown in a bottom view in the clamping region 48, opposite to the joining direction F. The clamping element 30 is a component that is preferably punched out of a sheet metal semi-finished product and subsequently bent. The punching can be performed in multiple punching steps. Due to the punching process, a punched edge is formed on the clamping element 30, which comprises a smooth cut region 42 and a tear region 54. In this case, a burr 55 is formed in the tear region 54 (see Figure 8 ).

[0067] Preferably, the clamping part 30 is manufactured in at least two stamping processes, wherein the bend 36 and the first contact strip 31 and the second contact strip 32 are manufactured in stamping processes with opposite stamping directions, so that the first contact strip 31 and the second contact strip 32 have a smooth cut area 42 pointing inwardly toward the clamping part gap 49 and the bend 36 has a smooth cut area 42 pointing outwardly perpendicular to the center axis YY.

[0068] The clamping element 30 can be slid back and forth in the clamping element housing 46 virtually without force on the smooth cut region 42 pointing outward from the center axis YY, in order to achieve the required floating mounting without getting stuck.

[0069] Due to the arrangement of the smooth-cut region 42 pointing in the direction of the clamping part gap 49 , the first contact web 31 and the second contact web 32 can achieve a high-quality contact surface without any chip formation.

[0070] Furthermore, the clamping element 30 has an undercut 53 in the region of the bend 36. The undercut 53 is arranged at the inner radius of the bend 36 and prevents the formation of burrs in the region of the bend 36. The undercut 53 is arranged in particular in the clamping region 48 of the bend 36. The undercut 53 thus enables a smooth surface in the region of the bend 36, allowing the bend 36 to slide on the sliding surface 51 of the clamping element housing 50 as effortlessly as possible and enabling reliable self-centering of the plug connector 100.

[0071] Figure 8 The diagram shows a schematic detail of a punched edge 56 of the clamping element 30 . The punched edge 56 has a smooth cut region 42 below the stretched region. This smooth cut region 42 adjoins a tear region 54 having a burr 55 .

[0072] As an alternative to the arrangement of the smooth cut region 42 , the clamping element 30 can be produced by precision cutting. In this case, the punched edge 56 has no tearing region 54 but only the smooth cut region 42 .

[0073] Thus, with the aid of the sword 10 and the clamping element 30 arranged in the clamping element housing 50 , a plug connector 100 according to the invention is provided which has a permanently high current-carrying capacity at low electrical contact resistance and can be assembled reliably due to high tolerance compensation.

Claims

1. A plug connector for transmitting current, in particular currents greater than 100 A, comprising a sword (10) and a clamping element (30), - wherein the sword (10) is designed to be inserted into the clamping element (30) along the joining direction (F) in order to form the plug connector, - wherein the sword (10) has a lower hardness than the clamping element (30), - the clamping element (30) has a first contact web (31) which is designed to be engraved into the first main surface (11) of the sword (10), - the clamping element (30) has a second contact web (32) which is designed to be engraved into the second main surface (12) of the sword (10), - wherein the first main surface (11) is oriented parallel to the second main surface (12) along the joining direction (F).

2. The plug connector according to claim 1, wherein the sword (10) has at least one chamfer (13), in particular four chamfers (13), at the distal end (14).

3. A plug-in connector according to any one of the preceding claims, wherein the sword (10) has a plastic injection-molded portion (15) which is designed to contact the clamping piece (30) in order to orient the sword (10) in the clamping piece (30).

4. A plug-in connector according to any one of the preceding claims, wherein the clamping member (30) has a first centering tab (33) and a second centering tab (34), which are provided for contacting a first side area (16) and an opposite second side area (17) of the sword (10).

5. A plug connector according to claim 4, wherein the first side area (16) and / or the second side area (17) have a centering area (18) and a recessed area (19) facing the longitudinal axis (XX), wherein the centering area (18) is arranged at the distal end (14) of the sword (10).

6. A plug connector according to claim 5, wherein the first centering tab (33) and the second centering tab (34) are arranged offset relative to the first contact tab (31) and the second contact tab (32) along the joining direction (F), so that the first centering tab (33) and the second centering tab (34) do not contact the sword (10) simultaneously with the first contact tab (31) and the second contact tab (32) during the joining process.

7. A plug-in connector according to any one of the preceding claims, wherein the clamping piece (30) has a clamping box (35) having four bends (36) perpendicular to the central axis (YY), so that the clamping piece (30) has a substantially closed, hollow cross-section perpendicular to the joining direction (F).

8. The connector according to claim 7, wherein the bent portion (36) has a relief groove (53).

9. The plug connector according to claim 7, wherein the clamping box (35) has at least one recess (37) which is provided for contacting the sword (10).

10. The plug connector according to claim 7, wherein the clamping box (35) has at least one reinforcement (38) which forms an insertion bevel for the sword (10).

11. A plug-in connector according to any one of claims 7 to 10, wherein the clamping box (35) has a closing tab (41) at a first circumferential end (39), wherein the closing tab (41) is designed to withstand radial forces of a second circumferential end (40) of the clamping box (35).

12. A plug connector according to any one of claims 7 to 11, wherein the first clamping tab (31) and the second clamping tab (32) have a smooth cut area (42) pointing inward toward the clamping gap (49), and wherein the bend has a smooth cut area (42) pointing outward perpendicular to the center axis (YY).

13. The plug connector according to claim 1, wherein the clamping element (30) comprises two first contact webs (31) and two second contact webs (32).

14. The plug connector according to claim 1, comprising a clamping element housing (50) having a sliding surface (51) on which the clamping element (30) is supported in a floating manner perpendicular to the joining direction (F).

15. The plug connector according to claim 14, wherein the clamping part housing (50) is supported in a floating manner on the sliding surface (51) in the region of the bend (36).

16. The plug connector according to claim 14, wherein the clamp housing (50) is an injection-molded component.

17. The plug connector according to claim 14, wherein the clamping element housing (50) has hooks (52) which secure the clamping element (30) in the clamping element housing (50) opposite to the joining direction (F).

18. The plug connector according to claim 1, wherein the clamping element (30) comprises a welding lug (43) which can be connected to a flexible conductor (44) in a material-locking manner.

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