A bushing contact and contact system

The invention relates to a bushing contact according to Claim 1 and a contact system according to Claim 13.

Contact systems with a bushing contact and a plug contact are known, the plug contact being inserted into the bushing contact. A higher degree of wear occurs in this regard at the bushing contact and plug contact due to the insertion movement. In the case of frequent plugging-in and unplugging of the plug contact, this can lead to damage to the contact system.

The problem of the invention is to provide an improved bushing contact and thus an improved contact system.

This problem is solved by means of a bushing contact according to Claim 1 and a contact system according to Claim 13. Advantageous embodiments are specified in the dependent claims.

It has been recognised that an improved bushing contact can be provided by the bushing contact having a contact housing and a contact element. The contact element is arranged in the contact housing and connected to the contact housing. The contact housing has a first side wall and a second side wall, the first side wall being arranged offset from the second side wall. The first side wall and the second side wall delimit a housing interior. The contact element is arranged in the housing interior. Furthermore, the contact housing has an aperture. The contact element has a continuous, flexible strip made of an electrically conductive material. The contact element is connected to the first side wall by a first end and to the second side wall by a second end in a further embodiment. As a result, a displacement of the first strip section when plugging in the plug contact is avoided. The contact element is supported on the first side wall in a first strip section and on the second side wall in a second strip section. A third strip section of the contact element is arranged opposite the aperture. The third strip section is formed to be applied to the plug contact in a flexible manner when a plug contact is introduced through the aperture into the housing interior .

This configuration has the advantage that a reliable electrical contact can be provided between the contact element and the plug contact. Furthermore, the configuration ensures that friction between the plug contact and the contact element of the bushing contact is minimised in that the strip rolls on the plug contact when the plug contact is inserted into the contact element.

In a further embodiment, the third strip section has a first limb, a second limb and a first arcuate region, the first arcuate region being arranged between the first limb and the second limb, the first limb being arranged offset from the second limb. The first arcuate region is arranged opposite the aperture. This configuration has the advantage that a jamming of the plug contact when it is inserted into the bushing contact can be reliably avoided. In a further embodiment, on a side which faces away from the aperture, the first limb is connected to the first arcuate region and the second limb is connected to the first arcuate region. On a side which faces the aperture, the first limb is coupled to the first strip section and the second limb is coupled to the second strip section. As a result, the first limb, the second limb and the first arcuate region form a receptacle which can reliably receive the plug contact.

In a further embodiment, the first arcuate region is formed to be C-shaped and/or encloses an angle which is greater than 180 degrees and smaller than 240 degrees.

In a further embodiment, the contact element has a second arcuate region between the first limb and the first strip section. The first arcuate region has a first curvature and the second arcuate region has a second curvature, the second curvature being in the opposite direction to the first curvature.

In a further embodiment, the contact element has a third arcuate region between the second limb and the second strip section, the third arcuate region having a third curvature, with the second curvature and the third curvature running in the same direction. As a result, the third arcuate region has an S-shaped

configuration relative to the second arcuate region. The first arcuate region has an inverted S-shaped configuration relative to the second arcuate region.

It is particularly advantageous if the first strip section and the first limb are arranged substantially parallel to each other. Additionally or alternatively, the second strip section and the second limb are arranged substantially parallel to each other. Additionally or alternatively, the first strip section is

arranged parallel to the second strip section. In a further embodiment, the first limb has a first convex arch to the second limb.

In a further embodiment, the second limb has a second convex arch to the first limb. The first arch and the second arch are selected such that there is a minimal distance between the first limb and the second limb substantially centrally in the transverse direction.

In a further embodiment, at the first arcuate region, at least one first bulge is arranged on a side which faces the aperture. The first bulge already ensures a reliable electrical contact to the plug contact when the plug contact is inserted, before it reaches the end position. Furthermore, the bulge guides the limb when bearing against the plug contact.

In a further embodiment, at the first arcuate region at least one further bulge is arranged on the side which faces the aperture, wherein the bulge and the further bulge are arranged in one plane, the plane being arranged parallel to a bending axis of the first arcuate region.

In a further embodiment, the contact system has the bushing contact described above and a plug contact, wherein the plug contact engages through the aperture, the third strip section bearing against the plug contact at least in sections.

In a further embodiment, the third strip section is formed such that the contour of the third strip section adapts following an outer contour of the plug contact.

In a further embodiment, the second arcuate region of the contact element is formed such that when the plug contact is plugged into the contact element, the strip rolls on a surface of the plug contact and the first limb is applied to the surface of the plug contact .

The invention will be explained in more detail hereafter with reference to figures. In the drawings:

Figure 1 shows a perspective depiction of a contact system;

Figure 2 shows a longitudinal section through the contact system shown in Figure 1 ;

Figure 3 shows a sectional view along a section plane A-A, shown in Figure 2, through the contact system shown in Figure 2 ;

Figure 4 shows a side view of a bushing contact of the contact system; Figure 5 shows a perspective depiction of the contact system in an insertion position;

Figure 6 shows a perspective depiction of the shown contact system in an intermediate position;

Figure 7 shows a perspective depiction of the contact system shown in Figure 6, in the intermediate position;

Figure 8 shows a perspective depiction of the contact system in an end position;

Figure 9 shows a side view of the contact system shown in Figure 8;

Figure 10 shows a perspective depiction of a variant of the contact housing shown in Figures 1 to 9; and

Figure 11 shows a perspective depiction of the bushing contact with the contact housing shown in Figure 10.

Hereafter, a coordinate system 5 is referred to in the figures. The coordinate system 5 is formed by way of example as a right- handed trihedron. The coordinate system 5 has an x-axis, a y-axis and a z-axis. The x-axis extends in the longitudinal direction. The y-axis extends in the transverse direction and the z-axis extends in the vertical direction. Of course, the axes can also be arranged differently than as shown in the figures.

Figure 1 shows a perspective depiction of a contact system 10.

The contact system 10 has a bushing contact 15 and a plug contact 20.

The plug contact 20 has a plug element 25 which, by way of example, has a substantially rectangular cross-section in the embodiment. The plug element 25 has a plug element upper side 30 and a plug element underside 35. The plug element upper side 30 and the plug element underside 35 are arranged substantially parallel to each other and by way of example are formed to be planar. The plug element upper side 30 and the plug element underside 35 are arranged by way of example in xy-planes which are arranged offset in the z-direction.

Furthermore, the plug element 25 has a tip 36. The plug element 25 laterally has a first side surface 40 and a second side surface 45 which is arranged towards the first side surface 40. The side surfaces 40, 45 connect the plug element upper side 30 to the plug element underside 35 and by way of example are arranged parallel to each other and extend in xz-planes which are arranged offset in the y-direction.

In addition to the plug element 25 shown in Figure 1, the plug contact 20 can have additional elements which, for reasons of clarity, are not depicted in the figures. In particular, the plug contact 20, for example, can in this case additionally have a plug housing, for example, in which the plug element 25 is arranged. The geometric configuration of the plug element 25 can also be different. In this way, the plug element upper side 30 and/or the plug element underside 35 can also be domed, for example, or can be formed with a different contour than shown, for example an undulating contour.

The bushing contact 15 has a contact housing 50 and a contact element 55. The contact housing 50 has a first side wall 60 and a second side wall 65. The first side wall 60 and the second side wall 65 are arranged parallel to each other. The first side wall 60 is arranged offset from the second side wall 65 in the z- direction. In this case, the first side wall 60 and the second side wall 65 each extend by way of example in an xy-plane.

The first side wall 60 and the second side wall 65 can be

connected to each other by way of example by means of a third side wall 70 of the contact housing 50 and a fourth side wall 75 of the contact housing 50. Also by way of example, in the

embodiment, the third side wall 70 and the fourth side wall 75 are arranged parallel to each other, in this case extend in an xz-plane and are thus arranged perpendicular to the first and second side walls 60, 65. Furthermore, the third side wall 70 is arranged offset from the fourth side wall 75 in the y-direction. The first to fourth side walls 60, 65, 70, 75 delimit a housing interior 80 with a rectangular cross-section. The contact element 55 is arranged in the housing interior 80.

The first side wall 60 has a first side wall inner surface 85 and the second side wall 65 has a second side wall inner surface 90. The first side wall inner surface 85 and the second side wall inner surface 90 are by way of example formed to be planar and are orientated parallel to each other in the embodiment. Of course, it is also conceivable that the first side wall inner surface 85 is arranged obliquely to the second side wall inner surface 90.

The housing interior 80 is delimited by a fifth side wall 95 in the longitudinal direction on a side which faces the plug contact 20. The fifth side wall 95 has a first side wall section 100 and a second side wall section 105. The first side wall section 100 is connected to the first side wall 60 at a fixed end. The second side wall section 105 is connected to the second side wall 65 by a fixed end. In the embodiment, the fifth side wall 95 is

arranged by way of example at a right angle to the first side wall 60 and to the second side wall 65 and the fifth side wall 95 extends in a yz-plane.

The fifth side wall 95 has an aperture 110. The aperture 110 is preferably formed substantially corresponding to a configuration of the plug element 25. In this case, the aperture 110 is

delimited by the first side wall section 100 on the upper side and by the second side wall section 105 on the underside respectively by a free end of the side wall section 100, 105. The aperture 110 extends substantially over the entire width of the contact element 55 between the third side wall 70 and the fourth side wall 75.

Figure 2 shows a longitudinal section through the bushing contact 15 shown in Figure 1.

The contact housing 50 has a connection section 115 on a side of the contact housing 50 which faces away from the aperture 110. An electrical conductor 120 is mechanically and electrically

connected to the contact housing 50 at the connection section 115 by means of a crimp connection 125. The contact element 55 has a continuous, flexible strip 130 made of an electrically conductive material. Preferably, the strip 130 is slightly domed. Preferably, the contact element 55 is made from a steel strip. Of course, the contact element 55 can also have different materials, for example copper or aluminium. In this case, it is advantageous that the strip is flexible and can be reversibly bent over larger angles, for example 180°. This is guaranteed by the strip being formed to be thin-walled. It is particularly advantageous if the strip has a thickness (in the z- direction) of 0.1mm to 0.5mm; in particular a thickness of 0.3mm to 0.4mm.

The strip 130 is connected to the first side wall 60 by a first end 135 and to the second side wall 65 by a second end 140. For this purpose, the first side wall 60 has a first web 145 and the second side wall 65 has a second web 150 in the embodiment.

The first web 145 is arranged on the inside of the strip 130. The first web 145 delimits a first receptacle 155 with the side wall inner surface 85, wherein the first end 135 of the strip 130 engages in the first receptacle 155 and is advantageously clamped in the first receptacle 155.

The second web 150 is arranged on the inside of the strip 130. Preferably, the second web 150 is arranged opposite the first web 145 in the z-direction. The second web 150 forms a second receptacle 160 with the second side wall inner surface 90. The second end 140 of the strip 130 is arranged in the second receptacle 160. In the embodiment, the second end 140 of the strip 130, by way of example, is clamped in the second receptacle 160.

Of course, it is also conceivable that the first end 135 and/or the second end 140 of the strip 130 is free or fixed differently in the respectively associated receptacle 155, 160. It is also conceivable that, instead of the webs 145, 150, the strip 130 is connected differently to the respective first and second side walls 60, 65 at the respective end 135, 140 of the strip 130. In this case, it is conceivable by way of example that the first end 135 is welded to the first side wall 60 and the second end 140 is welded to the second side wall 65, for example spot-welded.

The strip 130 has a first strip section 165, a second strip section 170 and a third strip section 175. The first strip section 165 borders on the first end 135 of the strip 130. The second strip section 170 borders on the second end 140 of the strip 130. The third strip section 175 is arranged between the first strip section 165 and the second strip section 170. The first strip section 165 is arranged between the aperture 110 and the first side wall 60 transverse to the longitudinal direction, by way of example in the z-direction, in the embodiment. The second strip section 170 is arranged in the z-direction between the aperture 110 and the second side wall 65.

In the embodiment, the first strip section 165 and the second strip section 170 are arranged parallel to each other by way of example. The first strip section 165 and the second strip section 170 can also be arranged obliquely to each other.

The first strip section 165 is supported on the first side wall inner surface 85 of the first side wall 60. The second strip section 170 is arranged opposite the first strip section 165 in the z-direction. The second strip section 170 is supported on the inside on the second side wall inner surface 90.

The third strip section 175 is arranged overlapping the first strip section 165 and the second strip section 170 in the

vertical direction (z-direction) . In this case, an overlapping in the vertical direction is understood to mean that, in the case of a projection of the first strip section 165, of the second strip section 170 and of the third strip section 175 in an xy

projection plane, the first strip section 165, the second strip section 170 and the third strip section 175 overlap in the xy projection plane.

The third strip section 175 is arranged opposite the aperture 110 and forms a receptacle 205. The third strip section 175 has a first limb 180, a second limb 185 and a first arcuate region 190. Furthermore, the strip 130 has a second arcuate region 195 and a third arcuate region 200. Both the first limb 180 and the second limb 185 and the first strip section 165 and the second strip section 170 are each arranged in the z-direction in xy-planes which are arranged differently offset from each other.

Furthermore, the first limb 180 and the second limb 185 are additionally optionally arranged parallel to each other.

Furthermore, the first limb 180 is arranged parallel to the first strip section 165 and the second limb 185 is arranged parallel to the second strip section 170. The first limb 180 can also be arranged obliquely to the first strip section 165 and/or

obliquely to the second strip section 170. Likewise, the second limb 185 can be arranged obliquely to the second strip section 170. Of course, it is also conceivable that the first limb 180 and the second limb 185 are arranged obliquely relative to each other .

The first limb 180 is orientated parallel to the first strip section 165 and to the first side wall 60, by way of example. The second limb 185 is arranged parallel to the second side wall 65 and to the second strip section 170, by way of example. In this case, the first arcuate region 190 connects a first end 210 of the first limb 180 on a side of the first limb 180 which faces away from the aperture 110 to a first end 215 of the second limb 185 on a side of the second limb 185 which faces away from the first aperture 110.

The first arcuate region 190 has a bending axis 220. The bending axis 220 extends for example in the y-direction and is arranged on a side of the first arcuate region 190 which faces the

aperture 110. The first arcuate region 190 is formed C-shaped by way of example. The first arcuate region 190 encloses a first angle of 180 degrees to 240 degrees by way of example.

Preferably, the first arcuate region 190 is orientated centrally (in the z-direction) relative to the aperture 110. In particular, in this case the bending axis 220 is located in an xy-plane in which a centre 221 of the aperture 110 is also arranged.

The second arcuate region 195 connects the first strip section 165 to a second end 225 of the first limb 180. The second end 225 of the first limb 180 is arranged on a side of the first limb 180 which faces the aperture 110. The second arcuate region 195 encloses a second angle of approximately 180 degrees, by way of example. The second arcuate region 195 is in this case arranged in the z-direction approximately at the height of the first side wall section 100.

The first arcuate region 190 has a first curvature and the second arcuate region 195 has a second curvature, the second curvature being in the opposite direction to the first curvature, such that in Figure 2 the second arcuate region 195, the first limb 180 and the first arcuate region 190 have the shape of an inverted S. Furthermore, the pretensioning forces Fsi, Fs2, Fs3 cause the receptacle 205 to be open and to be located in an insertion position in a non-inserted state of the third strip section 175. The third arcuate region 200 connects a second end 230 of the second limb 185 to the second strip section 170. The second end 230 of the second limb 185 is arranged on a side which faces the aperture 110. The third arcuate region 200 in this case

preferably encloses a third angle of approximately 180 degrees. The third arcuate region 200 has a third curvature. The second curvature of the second arcuate region 195 and the third

curvature of the third arcuate region 200 run in the same

direction, such that in Figure 2 the third arcuate region 200, the second limb 185 and the first arcuate region 190 have the shape of an S. Preferably, the second arcuate region 195 and the third arcuate region 200 have a same radius of curvature. The first limb 180 and the second limb 185 are tensioned against each other by the first arcuate section 175 with a first

pretensioning force _F si · The pretensioning force _F si presses the first limb 180 relative to the second limb 185, for example. Furthermore, the first limb 180 is tensioned with respect to the first strip section 165 by means of a second pretensioning force FS2 · Furthermore, the second limb 185 is tensioned with respect to the second strip section 170 by means of a third pretensioning force F3. The second and third pretensioning forces Fs2, Fs3 are preferably equally strong and cause a central positioning of the third strip section 175 in the z-direction in the contact housing 50.

Figure 3 shows a longitudinal section along a section plane A-A, shown in Figure 2, through the bushing contact 15.

The contact housing 50 has a first engagement element 235 and additionally by way of example a second engagement element 240. The first engagement element 235 is connected to the third side wall 70 and the second engagement element 240 is connected to the fourth side wall 75. In the embodiment, the engagement element 235, 240 is formed in that the first engagement element 235 is formed out of the third side wall 70 in a stamping-bending method. Likewise, the second engagement element 240 is formed out of the fourth side wall 75. In this case, the first engagement element 235 is preferably arranged perpendicular to the third side wall 70 and the second engagement element 240 is arranged perpendicular to the fourth side wall 75. Of course, a different orientation of the engagement element 235, 240 is also

conceivable . Preferably, the engagement element 235, 240 has a fourth

curvature, the fourth curvature running in the same direction as the first curvature of the first arcuate region 190 of the strip 130. The engagement element 235, 240 is arranged between the first arcuate region 190 and the first aperture 110.

The engagement element 235, 240 extends into the housing interior 80 and projects into the receptacle 205. By means of the first arcuate region 190 striking against a side of the engagement element 235, 240 which faces away from the aperture 110, the engagement element 235, 240 prevents the receptacle 205 from tilting with respect to the aperture 110 and prevents a possible relaxing of the third strip section 175, such that a desired configuration of the contact element 55 in the contact housing 50 is ensured.

Furthermore, the first arcuate region 190 optionally has at least one first bulge 245 on a side which faces the aperture 110.

Preferably, a plurality of first bulges 245 are arranged in a first row 250. The first row 250 is symbolically depicted in Figure 3 by means of a dashed line. The first row 250 is in this case orientated running parallel to the bending axis 220.

Furthermore, the strip 130 is formed concave relative to the aperture 110 in the first arcuate region 190, such that an edge 255 is at a greater distance from the opening 110 than a central region 260 of the first arcuate region 190. Figure 4 shows a top view of the bushing contact 15.

In addition to the first bulge 245, the first arcuate region 190 has at least one second bulge 265. The second bulge 265 is arranged on a side of the first arcuate region 190 which faces the aperture 110. Preferably, a plurality of second bulges 265 are provided, which are arranged in a second row 270 (depicted by a dashed line in Figure 4) in the y-direction. Preferably, the first row 250 is orientated parallel to the second row 270. In the embodiment, the first row 250 and the second row 270 extend in different (xy) planes which are orientated parallel to the bending axis 220 of the first arcuate region 190.

Figure 5 shows a perspective view of the contact system 10 during an insertion operation in the insertion position.

The tip 36 of the plug element 25 is already inserted into the receptacle 205 of the contact element 55 between the first limb 180 and the second limb 185. In this case, the tip 36 is arranged spaced apart from the first arcuate region 190. In the insertion position, the first arcuate region 190 has the smallest distance a relative to the aperture 110.

Figure 6 shows a perspective view of the contact system 10 during an insertion operation in an intermediate position.

In the intermediate position, the tip 36 bears against the first arcuate region 190 on the inside of the receptacle 205. The plug element 25 is inserted with an insertion force FE which acts in the x-direction. The tip 36 pushes the first arcuate region 190 away from the aperture 110 with the insertion force FE . The pretensioning forces Fi, F2, F3 cause a counterforce FG which acts against the insertion force FE and with which the plug element 20 is pushed out of the receptacle 205.

By means of the insertion force FE, a first tensile force F _z i, which acts in the longitudinal direction, acts on the first limb 180. The tensile force causes the strip 130 to be tightened. The strip 130 of the first strip section 165 is turned in its

direction in the second arcuate region 195 and is orientated in the direction of the first limb 180. In this case, the receptacle 205 is deepened in its extension in the x-direction and a length of the first limb 180 is increased. For this purpose, the second arcuate region 195 rolls on the plug element upper side 30 by means of the insertion force FE . As a result, a sliding friction between the first limb 180 and the plug element upper side is reliably avoided during plugging in 30.

Likewise, the length of the second limb 185 and the depth of the receptacle 205 are increased in that a second tensile force F _z2 acts on the second limb 185 via the first arcuate region 190 by means of the insertion force F _E . The second limb 185 pulls on the third arcuate region 200. The third arcuate region 200 is in this case pulled away from the aperture 110. In this case, the third arcuate region 200 turns round a direction of the strip 130 from the second strip section 170 and feeds it to the second limb 185 such that the second strip section 170 shortens and the second limb 185 lengthens. Simultaneously, the strip 130 rolls on the plug element underside 35 in the third arcuate region 200.

By means of the rolling movement of the strip 130 in the second and third arcuate regions 195, 200, a wearing of the contact element 55 and the plug element 25 is reliably avoided. As a result, the contact system 10 is particularly suitable for contacts in which the plug element 25 is often inserted into the receptacle 205 of the bushing contact 15 or withdrawn from the receptacle 205. Figure 7 shows a perspective view of the contact system 10 in the intermediate position.

It is particularly advantageous here that there is a first bevel 275 between the tip 36 and the plug element upper side 30 of the plug element 25, and a second bevel 280 between the plug element underside 35 and the tip 36. In this case, upon insertion of the tip 36 into the receptacle 205, the first bulge 245 comes to bear on the first bevel 275 and the second bulge 265 comes to bear on the second bevel 280, such that a reliable electrical contact between the contact element 55 and the plug element 25 can be produced at an early stage.

It is particularly advantageous here if the first bulge 245 comes into physical contact with the first bevel 275 and the second bulge 265 comes into physical contact with the second bevel 280 before the tip 36 touches the first arcuate region 190 between the first bulge 245 and the second bulge 265. As a result, upon further insertion of the plug element 25 into the bushing contact 15, a brief relative movement takes place between the bulge 245, 265 and the respective bevel 275, 280 which is associated with the bulge 245, 265, such that possible contamination of the plug element 25 and/or of the strip 130 is eliminated by the relative movement. Wear on the strip 130, however, is generally kept minimal by the brief relative movement.

Furthermore, an electrical contact is reliably ensured by the two-dimensional bearing of the first limb 180 against the plug element upper side 30 and of the second limb 185 against the plug element underside 35, and the contact element 25 is guided in the receptacle 205. In an alternative variant to the configuration described

previously, the first bulge 245 and/or the second bulge 265 are arranged such that the first bulge 245 comes into physical contact with the first bevel 275 and the second bulge 265 comes into physical contact with the second bevel 280 at the same time as the tip 36 comes into physical contact with the first arcuate region 190 between the first bulge 245 and the second bulge 265.

In a further alternative variant, the tip 36 can come into physical contact with the first arcuate region 190 between the first bulge 245 and the second bulge 265 before the first bulge 245 comes into physical contact with the first bevel 275 and the second bulge 265 comes into physical contact with the second bevel 280. As a result, a relative movement between the bulge 245, 265 and the respective bevel 275, 280 which is associated with the bulge 245, 265 is avoided, such that the contact system 10 is particularly wear-resistant.

The bevel 275, 280 and/or the bulge 245, 265 can also be

dispensed with.

Figure 8 shows a perspective view of the contact system 10 in an end position.

In the end position, the first arcuate region 190 has the

greatest distance a relative to the aperture 110. As a result, the second arcuate region 195 and the third arcuate region 200 are spaced further apart from the aperture 110 than in the intermediate position or in the insertion position (cf. Figures 5 to 7) .

After the rolling movement of the second and third arcuate regions 195, 200, the first limb 180 bears against the plug element upper side 30 and adapts to the contour of the plug element upper side 30. In this case, in particular, the first limb 180 follows the contour of plug element upper side 30 and the second limb 185 follows the contour of the plug element underside 35. In this case, the first limb 180 is pressed against the plug element 25 by the second arcuate region 195 and the second limb 185 is pressed against the plug element 25 by the third arcuate region 200. As a result, a large contact surface is provided between the plug element 25 and the limbs 180, 185. As a result, a reliable electrical contact is guaranteed between the plug element 25 and the contact element 55. In particular, a high current capacity of the contact system 10 is ensured in

conjunction with the pretensioning forces F _S i , F _s2 , F _s3 . Figure 9 shows a top view of the contact system 10 shown in

Figure 8 in the end position.

The first limb 180 has a first convex arch 285 relative to the second limb 185. The second limb 185 has a second convex arch 290 relative to the first limb 180. The first arch 285 and the second arch 290 are selected such that there is a minimal further distance b between the first limb 180 and the second limb 185 substantially centrally in the transverse direction relative to the overall extension, in the transverse direction (y-direction) , of the limb 180, 185. The arch 285, 290 can also be dispensed with or the arch 285, 290 can be selected in a concave shape. The first pretensioning force F _S i and the second pretensioning force F _S 2 press the first limb 180 against the contact element upper side 30. The first limb 180 is flattened in sections, such that the limb 180 bears against the contact element upper side 30 planarly, at least in sections, and ideally over the entire surface .

Likewise, the first pretensioning force F _S i and the third

pretensioning force F _S 3 cause the second limb 185 to press against the contact element underside 35. The second arch 290 is

flattened at least in sections such that the second limb 185 planarly bears against the contact element underside 35, at least in sections, and ideally over the entire surface. The planar bearing of the limb 180, 185 against the contact element 25 causes a high current capability of the contact system 10.

By means of a variation of the structural configuration of the strip 130 and/or of the material of the strip 130, in particular in the choice of the material of the strip 130, of the thickness d, of the arch 285, 290 (convex, concave) of the strip 130, of a bend radius of the arcuate region 190, 195, 200, the

pretensioning force Fsi, Fs2, Fs3 can be easily adapted for a secure current transmission. Additionally, it is therefore also possible to influence the counterforce FG .

Figure 10 shows in a perspective depiction of the contact housing a variant of the bushing contact 15 shown in Figures 1 to 9. In the embodiment, the contact housing 50 is formed from plastic. In this case, the engagement element 235, 240 projects into the receptacle 205. Additionally, the engagement element 235, 240 has a first bearing surface 295 on the upper side and a second bearing surface 300 on the underside. In the embodiment, the first bearing surface 295 is arranged inclined relative to the second bearing surface 300 by way of example. Of course, the first bearing surface 295 can also be arranged parallel to the second bearing surface 300 and extend in an xy-plane, for

example.

Additionally, the first and second side walls 60, 65 have a slot 305 which extends laterally from the aperture 110 to the

engagement element 235, 240. In the embodiment, the slot 305 and the bearing surface 295, 300 in this case overlap in the vertical direction. Of course, the slot 305 can also be dispensed with.

Figure 11 shows a perspective depiction of a variant of the bushing contact 15 with the contact housing 50 shown in Figure 10. Additionally in this case, the first limb bears on the inside against the first bearing surface 295 and the second limb 185 bears against the second bearing surface 300 in the insertion position. This configuration has the advantage that the geometry of the receptacle 205 is ensured, thus ensuring a reliable insertion of the plug element 25.

The bushing contact 15 described above is particularly well suited for all fields of application in which a high number of plugging cycles in conjunction with a high current capability is required. It is particularly conceivable in this case that the contact system provides an electrical connection to a removable, electrical energy store, for example for a vehicle, in particular an electrical bicycle, or an electrical hand tool. In particular, in this case the insertion force FE is particularly small in comparison to existing contact systems. By means of the rolling movement, a withdrawing force, which is to be applied in the x- direction, for withdrawing the plug contact 20 is furthermore particularly small. In this case, the contact system 10 carries out the movement described in Figures 5 to 8 in the reverse direction . The contact element 55 is also backwards compatible such that the development of novel contact housings 50 can be substantially dispensed with. Furthermore, the contact element 55 is to a great extent variable such that flexibly different (possibly

standardised) plug elements 25 can be introduced into the bushing contact 15 and reliable contacting of the plug element 25 by the bushing contact 15 is ensured.

Furthermore, it is advantageous that the contact system 10 described above is particularly robust against vibration. This is ensured by the flexible and elastic configuration of the contact element 55. In particular, in this case relative movements between the contact element 55 and the plug element 25 are avoided and/or kept particularly small. Moreover, by means of the configuration described above, the plug element 25 can be introduced obliquely, i.e. at an angle which is oblique to the x-axis and/or oblique to an xy-plane, through the aperture 110 into the plug contact 20. The flexible strip 130 is applied to the plug element 25 and provides a reliable electrical contact. As a result, the contact system 10 has a particularly robust behaviour. In particular, the angle can have a value which is in the range of -15° to 15°.

It is noted that the configuration of the contact system 10 shown in Figures 1 to 11 can also of course be formed differently. In particular, in this case it is also conceivable that, instead of the concave configuration of the first limb 180 relative to the second limb 185 or the concave configuration of the second limb 185 relative to the first limb 180, the limbs 180, 185 have a convex or planar profile. It is particularly advantageous here if the limb 180,

185 encloses an angle of less than 10 degrees to form the concave profile .

List of reference numbers

5 Coordinate system

10 Contact system

15 Bushing contact

20 Plug contact

25 Plug contact

30 Plug element upper side

35 Plug element underside

36 Tip

40 First lateral surface

45 Second lateral surface

50 Contact housing

55 Contact element

60 First side wall

65 Second side wall

70 Third side wall

75 Fourth side wall

80 Housing interior

85 First side wall inner surface

90 Second side wall inner surface

95 Fifth side wall

100 First side wall section

105 Second side wall section

110 Aperture

115 Connection section

120 Electrical conductor

125 Crimp connection

130 Strip

135 First end of the strip

140 Second end of the strip

145 First web

150 Second web

155 First receptacle

160 Second receptacle

165 First strip section

170 Second strip section

175 Third strip section 80 First limb

85 Second limb

90 First arcuate region

195 Second arcuate region

00 Third arcuate region

05 Receptacle

10 First end of the first limb 15 First end of the second limb 20 Bending axis

21 Centre of the aperture

25 Second end of the first limb 230 Second end of the second limb 235 First engagement element 240 Second engagement element 245 First bulge

250 First row

255 Edge

260 Central region

265 Second bulge

270 Second row

275 First bevel

280 Second bevel

285 First arch

290 Second arch

295 First bearing surface

300 Second bearing surface

305 Slot

F _S i First pretensioning force

F _S 2 Second pretensioning force

F _s3 Third pretensioning force

F _z i First tensile force

F _z2 Second tensile force

F _G Counterforce

F _E Insertion force