Connectors with connector shielding

Abstract

The invention relates to a plug connection for the electrically conductive, detachable contacting of contacting elements, comprising a connector plug and a connection interface designed as a connector mating plug, wherein the connector plug has a device for shielding electromagnetic emissions, wherein the device for shielding is formed by a collective shield, comprising at least one shield connection field with at least two shield transfer devices for contacting element shields and at least one shield transfer, wherein the shield connection field has at least one spring bushing.

Description

The invention relates to a plug connection for the electrically conductive, detachable contacting of contacting elements, having a plug connector plug and a connection interface designed as a plug connector mating plug, wherein the plug connector plug has a device for shielding electromagnetic emissions.For contacting or producing releasable, electrically conductive connections, plug connections, contacting elements, pole connectors, plug sleeves and so forth are used in a wide variety of designs and variants. In particular, but not exclusively, in the case of electrical contact-making tasks in the higher power range, contact systems have been developed which are based on prismatic or round geometries for accommodating one or more contact pins.From the publications DE 691 24 873 T2 and CN 216981048 U, plug connectors with shielding solutions are known.High-voltage plug connectors are frequently realized with one or more plug contact pins and must meet further requirements depending on the field of use in addition to the reliable, detachable and durable contacting. Depending on the embodiment of the electrically conductive and detachable plug connection, depending on the field of application, there are a wide variety of requirements, often also to be fulfilled cumulatively: reliability, durability, releasability, reduced resistance, resistance to external influences and environmental conditions, insensitive to contact corrosion and many more. A criterion which is to be fulfilled practically always is electromagnetic compatibility (EMC).Electromagnetic compatibility means the (extensive) absence of influences on other devices and devices which in these devices lead to functional faults in electrical or electronic equipment due to, for example, electrical, magnetic or electromagnetic fields and processes. This already includes influences by currents or voltages. The European EMC guideline defines electromagnetic compatibility as follows: "the ability of an apparatus, a plant or a system to operate satisfactorily in the electromagnetic environment without itself causing electromagnetic interference which would be unacceptable for all apparatuses, plants or systems present in this environment." (Source: EU Guideline 2014 / 30 / EU Article 3 No. 4 of 26.02.2014).Electromagnetically relevant interference emissions can also originate from plugs, plug connections, contacts and the lines, since these are current-carrying. In order to ensure electromagnetic compatibility, apparatuses, devices, lines, plug connectors are frequently shielded. The shielding of electrical appliances, devices and spaces serves to keep electrical and / or magnetic fields occurring away from them or, conversely, to protect the environment from the fields emanating from the device.In the area of the plug connectors, plug contacts, contacts, the shielding devices of lines must be continued without gaps and interruptions in order to ensure that electromagnetic emissions are reduced or prevented.To meet this requirement, various approaches have been pursued in the prior art. In principle, a coupling impedance is realized between the inner, current-carrying conductor (core, stranded wire) and the outer cable shield (outer conductor, cable shield) on the basis of the mode of action of the Faraday cage.For a large number of applications, sufficient shielding of the plug connectors is necessary to improve the electromagnetic compatibility. For this purpose, electrical plug connectors are usually encapsulated by injection molding with an electrically conductive sheath or a metallic braid is inserted.In order to contact the shielding elements of the lines, cables in the region of the plug connectors or to continue these cable shields without gaps ("shield transfer"), sleeves, spring sleeves, shield sleeves, shield springs can be used, which continue the shielding devices of the lines with the shielding measures of the plug connector housing and / or of the mating plug to be contacted and / or of the line to be contacted.In addition to the functional aspects of the shielding elements, the economics and suitability for mass production and ease and ideally automated assembly are also an important criterion. Shielded plug connections, plugs, lines, contacts, etc. are mass-produced articles in extremely high numbers, the economics of which depend on a cost-minimized construction and easier, simple assembly.As a rule, the shields are formed within plug connectors and at the ends of cables, lines to be contacted as shield sleeves. DE 10 2012 110 233 A1 shows a shielding sleeve designed as a shielding part with a spring ring in a connecting device for transmitting high-voltage current in the motor vehicle sector, having at least one first connection element, at least one second connection element, at least one shielding housing part and fixing means, wherein the first connection element has at least one first housing arrangement having a first insulating housing part having at least one first contact element which is electrically connected to an inner conductor of a cable, and a shielding arrangement which is connected to a shielding of the cable, wherein the shielding arrangement is connected to the shielding housing part via a shielding element, and wherein the second connection element has at least one second housing arrangement having a second insulating housing part having at least one second contact element which is electrically connected to a power-conducting element.The screening solution for round plug connections, which is presented in DE 11 2012 002 827 B4, is likewise sleeve-shaped, having a screen, consisting of a screen braid of the cable and a screen sleeve arranged within a handle body, wherein the screen sleeve ends at the plug-side end of the handle body. The shielding sleeve interacts with a movable contacting element, so that there is an electrical connection that shields depending on the position.In addition to the gapless shielding in the region of plug connections by reliable contacting of the shielding elements of the cable, the plug connection and the plug connection housings, it is always also a particular need that shielding of plug connections with a plurality of contact partners be shown both economically and in a way that minimizes installation space. Concepts have been developed for this purpose which use so-called sum shields instead of the individual shielding of the contact partners within the plug connector housing. The implementation of such shieldings in the plug connector region with a plurality of contact partners is effected by shielding within the plug connector which collectively shields all or part of the inner contact partners.Such shielding is shown, for example, in DE 10 2013 021 571 A1. The shielding concept comprises a contacting device for a motor vehicle, having a sum shield for shielding at least two mechanically independent contacting partners, a fastening element, a connection interface in the form of a motor vehicle component and a plug connector interface in the form of a pressing element, wherein the fastening element mechanically connects the pressing element and the motor vehicle component and, on account of this mechanical connection, there is also an electrical coupling between the sum shield and the motor vehicle component.A functionally similar arrangement is described in DE 10 2016 105 497 B3. The subject matter is an electrical plug connector, in particular a high-voltage plug connector, for a vehicle, having a plug with a plug housing, at least one electrical contact part which is accommodated in the plug housing, a mating plug with a mating plug housing, and a shield housing which surrounds the plug housing and the mating plug housing at least partially. The shield housing has a fastening flange in a connecting region, designed as a shield housing interface, toward a mating element which can be connected thereto, designed as a connection interface, wherein an engagement projection of the shield housing, which is spaced apart from the fastening flange in the longitudinal direction of the plug connector, engages at least in a form-fitting manner in an engagement groove of the plug housing.DE 10 2018 003 721 A1 provides for shielding the electrical lines in the region of plug connections to be designed as a total shield and thus for the shieldings to be connected to one another preferably in a low impedance manner already before the actual plug connections. Here too, it is necessary for the shielding realized by the total shield to be electrically contacted with the plug connector and thus for the shielding function to be transferred to the latter.Available shielding concepts based on sum shields in the plug connector area have the disadvantage that the shielding transfer, i.e. the electrical contacting between two or more plug connections, takes place via the sum shield directly to the connection interface and thus the mating interface of the functional mating plug or mating plug installation space. The connection interface must therefore be compatible with the shielding housing interface and must have directly the connection contours for shielding and further functions such as sealing and mechanical fixing.The connection interface generally requires small geometric and dimensional tolerances for the shielding transfer, mechanical connecting elements and surfaces and surface roughnesses suitable for the sealing function.It is the object of the invention to further develop shields, shielding solutions, in particular in plug connection arrangements with electrical contact-making elements and shield contact-making, so that the aforementioned disadvantages of the prior art are at least partially reduced and the installation space requirement for total shields and the mechanical complexity thereof is reduced.To achieve the object, the invention proposes a plug connection having the features of claim 1. In this concept, a sum shield for shielding electromagnetic emissions is arranged within a plug connector plug housing. A first contacting element and at least one second contacting element are housed within the total screen, so that the total screen shields the contacting elements. The total screen has a screen connection field for shielding contacting of the shielding devices of at least two contacting elements and an integrated screen relay to a connection interface, which can be a plug connector counterplug from a functional point of view.The invention recognizes that a considerable functional, mechanical-geometric and construction space-reducing design can be achieved in that the shield connections of the two or more shields of the contacting elements relate directly to the total shield and do not directly contact a connection interface. The sum shield can preferably be located in a sealed installation space of a plug connector plug housing and can thereby be protected from corrosion.A further advantage is that differently shaped, dimensioned shields of the contacting elements are shown to be compatible with the connection of the shield connection field, so that the connection interface can be formed largely uniformly and without adaptations to the shields of the contacting elements. Sealing measures which may be required can also be integrated into the shield connection field, so that structural configurations of the connection interface with respect to individual contacting element shields are not required.Since the shield connection field comprises the geometries, shapes and dimensions subject to tolerances for the shield connections of the two or more shields of the contacting elements, both the shield relay of the total shield and the connection interface can be designed in a structurally simple manner so as to transfer the shield, for example by a suitable contacting surface and optionally supplemented by a sealing device.The shield connection field of the sum shield can be adapted depending on the number, size and shape and configuration of the respective shields of the contacting elements, so that the sum shield according to the invention can be constructed for a wide variety of plug connections.The invention is explained in more detail below with reference to an exemplary embodiment in conjunction with the figures. The following are shown: FIG. 1 shows a sectional front view of the plug connection with a plug connector plug and a connection interface in the plugged-together situation; FIG. 2 is a sectional front view of a component of the shield connection panel; FIG. 3 shows a perspective view of a shielding connection panel, exemplarily formed with a spring bushing; FIG. 4 is a sectional top view of a region of the plug connection with screen relay.FIG. 1 shows a sectional front view of the plug connection 1 with a plug connector plug 10 and a connection interface 20 in the plugged-together situation. The connection interface 20 is functionally designed as a plug connector mating plug of the plug connector plug 10 and can be plugged together with the latter in such a way that contacting elements can be contacted in a releasable and electrically conductive manner.The plug connector 10 has a plug connector housing 11, in the interior of which a plug connector shield in the form of a sum shield 30 for shielding electromagnetic emissions is arranged at least partially. The sum screen 30 is constructed at least in two parts and has a first sum screen element 31 and at least one second sum screen element 32. The sum shield elements 31, 32 are designed in the shape of a trough and can be collapsed in such a way that the sum shield 30 forms an inner cavity for enclosing contacting elements to be shielded. To implement the electromagnetic emissions shielding function, the sum shield 30 or the sum shield elements 31, 32 is formed from an electrically conductive material, for example a metallic sheet metal.The contact region of the sum screen elements 31, 32 is designed as a screen transfer 34, so that the screen elements 31, 32 are put together both mechanically and with a shielding effect of electromagnetic emissions. For this purpose, the screen transfer 34 is designed as a substantially encircling contact surface of the sum screen elements 31, 32 with respect to one another.The sum screen 30 has a screen connection field 33, which is provided on the first sum screen element 31 in this exemplary embodiment. Corresponding to the number of contacting elements or contacting element shields, shield connection field 33 contains two or more shield transfer devices, such as spring bushes, clamping rings or contact spring elements. Functionally, the shield connection field 33 contacts the individual contacting element shields, such as steel woven fabric or knitted metal fabric, via these shield transfer devices with the sum shield 30 and thus ensures the continuous, gapless shielding of the electromagnetic emissions.For shielding contacting of the sum screen 30 with a connection interface 20, the exemplary embodiment shown has, by way of example, a screen relay 35 on the second sum screen element 32.An embodiment of the screen relay 35 shown by way of example in FIG. 1 can be formed by a folding or folding on the second sum screen element 32. This creates a protrusion that contacts the contact surface of the connection interface 20.By the combination of screen connection field 33 and screen relay 35 of the total screen 30, both the design-geometric requirements of the screen connections of the contacting element screens and those of the screen contacting of the connection interface 20 are integrated into the total screen 30, so that the design of the connection interface 20 can be designed very easily and the total screen 30 has to be adapted hardly or not geometrically at all for many applications. At the same time, the installation space requirement for the entire shielding device is reduced.FIG. 2 comprises a sectional front view of a component of the shielding connection field 33 exemplarily designed as a spring socket 36. The spring socket 36 is arranged in a embracing manner of a receiving space 12 of the plug connector housing 11. the receiving space 12 forms an enclosed region for receiving a contacting element (the contacting element is not shown). For contacting the shielding device of the contacting element, the spring bushing 36 has elastically resilient lamellae which interact in an electrically conductive manner, for example, with a sleeve or a knitted wire mesh.The total screen 30 can have two or more screen connection fields 33, wherein the configuration as a spring bushing 36 represents one of several possibilities and is to be understood as an example. Other solutions, for example in the form of clamping bushes, contact rings or simple sleeve elements, are conceivable and can be combined.FIG. 3 depicts a perspective view of a shielding connection panel 33 exemplarily formed with a spring bushing 36. In order to produce the necessary electrically conductive contacting of the spring bus 36 with the sum shield 30 or the first sum shield element 31 arranged in the interior of the plug connector housing 11, the shield connection field 33 has a toothing 37.FIG. 4 shows a sectional top view of a region of the plug connection 1 with screen relay 35 from the total screen 30 to a shielding device of the connection interface 20, so that the shielding of electromagnetic emissions is hermetically continued in this region. In this case, the screen relay 35 makes electrical contact with the total screen 30 or the total screen elements 31, 32 to a shielding device (not shown) of the connection interface 20.The shield relay 35 is preferably formed as a fold or a fold on the second sum shield element 32 and protrudes, so that a contact surface of the connection interface 20 can be electrically conductively contacted. By means of this embodiment, the invention achieves in an integrating manner a constructionally simple and geometrically universal configuration of the shielding device of the connection interface 20 independently of the number and configuration of the shielding devices of the contacting elements and their contacting with the total shield 30, realized by the shield connection field 33.List of reference characters1 Plug connection 10 Plug connector 11 Plug connector housing 12 Receiving space 20 Connection interface 30 Total shield 31 First total shield element 32 Second total shield element 33 Shield connection field 34 Shield transfer 35 Shield transfer 36 Spring bushing 37 Toothing

Claims

Plug connection (1) for the electrically conductive, detachable contacting of contacting elements, having a plug connector plug (10) and a connection interface (20) designed as a plug connector mating plug, wherein the plug connector plug (10) has a device for shielding electromagnetic emissions, wherein the device for shielding is formed by a sum shield (30), having at least one shield connection field (33) with at least two shield transfer devices for contacting element shields and at least one shield relay (35), characterized in that the shield connection field (33) has at least one spring socket (36).Plug connection (1) according to Claim 1, characterized in that the plug connector plug (10) has a plug connector plug housing (11) in which the sum shield (30) is at least partially arranged.Plug connection (1) according to Claim 1, characterized in that the sum shield (30) for shielding electromagnetic emissions is constructed at least in two parts and has a first sum shield element (31) and at least one second sum shield element (32).Plug connection (1) according to Claim 3, characterized in that the sum shield elements (31, 32) can be collapsed and each have a contact region with respect to one another which is designed as a shield transfer (34).Plug connection (1) according to Claim 4, characterized in that the shield transfer (34) is designed as a substantially encircling contact surface of the sum shield elements (31, 32) with respect to one another.Plug connection (1) according to Claim 3, characterized in that the sum shield elements (31, 32) have a trough-shaped geometry, such that the sum shield (30) forms an inner cavity for enclosing contacting elements to be shielded.Plug connection (1) according to one of the preceding claims, characterized in that the shielding connection field (33) has at least one toothing (37) which interacts with the spring bushing (36) and the sum shield (30, 31, 32), such that the spring bushing (36) is electrically conductively contacted with the sum shield (30, 31, 32).Plug connection (1) according to Claim 1, characterized in that the screen relay (35) is designed as a fold or flange.

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