Cover arrangement for realizing EMC shielding, in particular a housing cover arrangement for realizing EMC shielding of an electrical and / or electronic component arranged in a housing, preferably a cover arrangement for a pulse-controlled inverter (PWR) of a motor vehicle

Abstract

The invention relates to a cover arrangement (1) for realizing EMC shielding, in particular a housing cover arrangement (1a) for realizing EMC shielding of an electrical and / or electronic component arranged in a housing, preferably.Cover arrangement (1) for a pulse-controlled inverter (PWR) of a motor vehicle, wherein the cover arrangement (1) has at least a first cover element (2), in particular a metallic cap (2a), and at least one second cover element (3), in particular a plastic cover (3a), wherein the first cover element (2) can be brought into at least partial electrically conductive contact with a ground contact, in particular with a housing and / or motor vehicle wall, for shielding and / or dissipating EMC interference and / or electromagnetic radiation and / or is at least partially electrically conductively contacted in the assembled state, and wherein the cover arrangement (1) can be arranged and / or fastened with the aid of the second cover element (3). The assembly effort is reduced in that the cover arrangement (1) is designed and / or constructed in such a way that during assembly of the cover arrangement (1) the first and the second cover element (2, 3) are arranged and / or can be arranged so as to be movable relative to one another.

Description

[0001] The invention relates to a lid arrangement according to the features of the preamble of patent claim 1.

[0002] Cover arrangements for implementing EMC shielding are already known in the prior art. The abbreviation / term "EMC" generally stands for "electromagnetic compatibility." EMC shielding is intended to divert and / or shield electromagnetic radiation. In particular, the components and / or parts located on the other side of a shield should not be disturbed and / or damaged by the generated electromagnetic radiation. EMC shielding is therefore suitable for various components, particularly where electromagnetic radiation is present and / or generated, in order to then shield and / or protect other components and / or parts located near the source of the electromagnetic radiation from the electromagnetic radiation.Corresponding cover assemblies, particularly for housings or the like, are suitable for shielding other parts and / or components not located within the housing from electromagnetic radiation when the source of the electromagnetic radiation is located within the housing, or (conversely) for protecting parts and / or components located within a housing from electromagnetic radiation when the source of the electromagnetic radiation is located outside the housing. Therefore, various applications and / or arrangements or uses of the corresponding cover assemblies in question here are possible; this should be noted.

[0003] For example, EP 2 683 228 A2, from which the invention is based, shows a cover arrangement for the electromagnetic shielding of a housing top, wherein electrical and / or electronic components which generate electromagnetic radiation during operation are arranged in the housing. The electromagnetic radiation should then not penetrate to the outside. The cover arrangement shown here has a first cover element, namely a metallic cap, and a second cover element, namely a plastic cover. The first cover element, namely the metallic cap, can be brought into electrically conductive contact with a ground contact, in this case with the housing walls surrounding the housing opening, for shielding or for dissipating EMC interference or for dissipating electromagnetic radiation.When assembled, the metallic cap is placed on top of the housing, with the second cover element, namely the plastic cap, then being arranged over the metallic cap as protection for the metallic cap or - when assembled - being arranged accordingly.

[0004] For example, DE 10 2006 030 805 A1 describes an EMC optimization for a sensor housing in which a plastic housing with a number of outwardly directed contacts has, in addition to an existing cover, a metallic or metallized cover. Sensors and / or electronic components are located inside the housing. A metallic cover / cap is additionally applied to the outside of the housing and connected to the electrical contacts in such a way that the metallic cover can then, in turn, be brought into electrically conductive contact with a ground contact via the electrical contacts. The plastic cover is then located beneath the metal cap, with no connection between the metal cap and the plastic cover.

[0005] Finally, DE 10 2022 204 199 B3 discloses an electronic module for a vehicle having a corresponding housing. A cover assembly is provided, namely a cover designed as a self-clamping and electrically contacting EMC protective cover. The housing forms a type of "Faraday cage," wherein the cover element, i.e., the housing cover, is designed such that several spring elements are formed as circumferential sections on its edge region as integral components. With the aid of these spring elements, the housing cover can be easily mounted on the housing opening or adjacent to the housing opening, whereby the electrical contact or ground contact between the cover and the housing walls can then be realized at the same time.

[0006] The cover assemblies known in the prior art, in particular the cover assembly on which the invention is based (EP 2 683 228 A2), are not yet optimally designed. On the one hand, a first cover element, namely a metallic cap, is provided or present for implementing the EMC shielding; on the other hand, a second cover element, in particular a plastic cover, is provided, which in turn is intended to protect the first cover element or the metallic cap, for example against corrosion. The assembly of such a cover assembly is complex; in particular, the implementation of an electrical connection between the first cover element, in particular the metallic cap, and the walls of this housing is very problematic or impossible.Time-consuming, particularly because of the existing tolerances between the first and second cover elements and the formed housing walls, the first cover element, i.e., the metal cap, must be installed first, followed by any sealing elements, and finally the second cover element, especially the plastic cover, must be installed. This "procedure" makes assembly both complex and costly.

[0007] The invention is therefore based on the object of designing and developing a cover arrangement in such a way that the disadvantages mentioned at the outset are avoided, in particular the assembly effort for assembling the cover arrangement and the associated costs are reduced.

[0008] The previously indicated object is now achieved with the cover arrangement according to the features of patent claim 1.

[0009] An essential aspect of the invention is that the cover assembly is designed and / or constructed in such a way that, during assembly of the cover assembly, the first and / or second cover elements are arranged and / or can be arranged so as to be movable relative to one another. This allows the corresponding tolerances to be compensated for easily and without significant time expenditure during assembly of the cover assembly, and thus no longer pose any problems during assembly.

[0010] At least one spring element is arranged and / or provided between the first and second cover elements; preferably, several spring elements are arranged and / or provided or present. The spring element can be designed, in particular, as a metallic spring element or as an elastic element, in particular as a rubber element.

[0011] Due to the design or arrangement of the spring element between the first and second cover element, a relative movement of the first cover element to the second cover element can be generated, in particular, when the cover arrangement is placed from above, in particular onto a housing opening, wherein the cover arrangement is then pressed onto the housing or onto the housing opening, so that the first cover element, namely the metallic cap, comes into electrically conductive contact with the housing walls and, via the abutment effect, when the cover arrangement is pressed further onto the housing opening or onto the upper wall regions of the housing, the relative movement of the first cover element, the metallic cap, to the second cover element, namely the plastic cover, is generated.Simply put: During assembly, the first cover element located on the inside, namely the metallic cap, is pressed - relatively speaking - towards the second cover element, namely towards the inside of the plastic cover, against the spring action of the spring element. The spring element therefore establishes the electrically conductive contact between the first cover element, in particular the metallic cap, and the corresponding ground contact. The entire cover arrangement can then be fastened with the help of the second cover element, in particular with the help of a screw connection, and in particular can be connected to the housing walls surrounding the housing opening. The disadvantages mentioned above are therefore avoided and corresponding advantages for assembly are achieved.

[0012] There are now different possibilities for the design and construction of the spring elements.

[0013] First, the respective spring element or spring elements can be arranged and / or formed directly on the first lid element, in particular on the metallic cap. However, it is also possible to form and / or arrange the spring element and / or spring elements on the second lid element, in particular on the plastic lid. If there are multiple spring elements, some of them can be arranged on the first lid element and some on the second lid element; this is also conceivable. The different possibilities will be explained in more detail below.

[0014] In particular, the spring element can be designed as an elastic element, particularly as a clamping rib. This then enables the first cover element to be easily clamped to the second cover element. It is also conceivable for the spring element or the elastic element to be designed as a spring contour or as a spring rib or even as a spring washer, particularly with a correspondingly grooved surface structure. In particular, this also makes it possible to generate different degrees of elasticity and thus different degrees of relative mobility of the first and second cover elements. The design of the spring element as a metallic spring element is also conceivable, as already mentioned.

[0015] Finally, the first cover element can have a recess and / or an opening for receiving and / or arranging a guide pin of the second cover element, which can be brought into engagement with one another and / or are engaged in particular in order to ensure the relative movement / guiding of the first to the second cover element during assembly.

[0016] In the cover arrangement according to the invention, the first and the second cover element are therefore then effectively connected to one another, in particular clipped together or partially screwed together, but - before the final assembled state - are still arranged to be relatively movable relative to one another, in particular in order to realize the advantages described above.

[0017] There are now numerous possibilities for advantageously designing and developing the cover assembly according to the invention. For this purpose, reference is first made to the claims subordinate to claim 1. Several preferred embodiments of the invention will be explained in more detail below with reference to the drawings and the accompanying description. The drawing shows: Fig. 1a to 1c → in a very schematic representation of the assembly sequence of a cover arrangement according to the invention, in particular on a housing opening of a housing which is only partially shown, Fig. 2a and Fig. 2b → schematic representation of the assembly of a cover arrangement in a first embodiment, Fig. 3a and Fig. 3b → the assembly of a cover assembly in a second embodiment, and Fig. 4a and Fig. 4b → the assembled cover arrangement in a schematic representation according to a third and fourth embodiment.

[0018] The Fig. Figures 1 to 4 essentially show a cover assembly 1 for implementing EMC shielding. The cover assembly 1 can thus be used to shield and / or divert electromagnetic radiation.

[0019] The ones here in the Fig. The cover assembly 1 shown in Figures 1 to 4 is designed, in particular, as a housing cover assembly 1a for implementing EMC shielding of a housing that is only partially shown in the figures, or can be used as such. In particular, electrical and / or electronic components are located in the only partially shown housing. Preferably, the cover assembly 1 or the housing cover assembly 1a is designed, or can be used, for the housing of a pulse-width inverter (PWR) of a motor vehicle, not shown in detail here. In particular, the housing of a PWR therefore has the Fig. 1 to 4 shown cover arrangement 1.

[0020] The cover assembly 1 comprises at least a first cover element 2, in particular a metallic cap 2a, and at least one second cover element 3, in particular a plastic cover 3a. The first cover element 2, in particular the metallic cap 2a, is provided or intended for shielding and / or dissipating electromagnetic radiation, and the second cover element 3, in particular the plastic cover 3a, is provided or intended for protecting the first cover element 2, i.e., for protecting the metallic cap 2a.

[0021] For the derivation and / or shielding of EMC interference or electromagnetic radiation, the first cover element 2 is provided with a ground contact, in particular with a Fig. 1 to 4 only partially shown housing wall 4 and / or with a corresponding motor vehicle wall, in particular these components can be brought into direct electrical contact with one another or with each other, wherein - in the assembled state - the first cover element 2, here in particular the metallic cap 2a, is then at least partially, namely in particular with its edge region partially in electrically conductive contact with the ground contact, in particular with the housing walls 4 surrounding a housing opening not designated in more detail here.

[0022] With the aid of the second cover element 3, in particular the plastic cover 3a, the cover arrangement 1 can then be fastened or arranged, in particular with the aid of separate screw connections 5, wherein the second cover element 3 can also be effectively connected to the corresponding mass, in particular to the housing walls 4, with the aid of the screw connections 5.

[0023] The disadvantages mentioned at the outset are now initially avoided in that the cover arrangement 1 is designed and / or constructed in such a way that during assembly of the cover arrangement 1 the first and second cover elements 2 and 3 are movable and / or arranged relative to one another.

[0024] In particular, the Fig. The assembly steps schematically shown in Figures 1a to 1c show this relative movement of the cover elements 2 and 3 to each other.

[0025] This shows the Fig. 1a shows the cover assembly 1 above the housing, which is only partially represented by the housing walls 4, prior to assembly of the cover assembly 1. The spring element 6, shown schematically here between the first and second cover elements 2 and 3, is clearly visible. A source 7 for electromagnetic radiation is located within the housing or within the area delimited by the housing walls 4, and the interior of the housing is now shielded from the environment with the aid of the cover assembly 1.

[0026] This will then Fig. 1b, the cover arrangement 1 is pressed onto the upper area or closes the housing opening not designated in more detail here, wherein the first cover element 2, here the metallic cap 2a, with its edge areas comes into direct contact with a ground contact, in particular here with the upper areas of the housing walls 4. Fig. 1b shows the not yet finally fixed state of the cover assembly 1, which is then in Fig. 1c, since here the cover arrangement 1 is then completely assembled with the aid of the screw connections 5, in particular here not only the first cover element 2, but also the second cover element 3 is in contact with the upper area of the housing walls 4.

[0027] However, the "shortening" of the spring element 6 arranged between the first and second cover elements 2 and 3 is clearly visible, since due to the assembly and the correspondingly exerted pressure, the spring element 6 is compressed accordingly when the cover arrangement 1 is placed on the unspecified housing opening or on the housing walls 4 and then triggered via the abutment function via contact with the upper areas of the housing walls 4, then during assembly the first cover element 2 moves relative in the direction of the second cover element 3 or (also seen the other way around) the second cover element 3 moves relative in the direction of the first cover element 2, and the spring element 6 is then compressed.

[0028] The Fig. 1a to 1c, however, show the corresponding advantages of the cover arrangement 1 and the possibility of a simple assembly of a cover arrangement 1, in particular that possibly existing tolerances in such an assembly are then unproblematic and therefore the corresponding advantages are achieved.

[0029] As in particular the Fig. 1 to 4 further show in respective schematic representations, a spring element 6 acting and / or present between these cover elements 2 and 3 is now provided and / or arranged at least between the first and second cover elements 2 and 3, in particular a plurality of spring elements 6 are provided and / or arranged.

[0030] Particularly preferred embodiments are now described in the Fig. 2 to 4 are described in more detail, including the following: Fig. 2a shows a cover assembly 1 before assembly or the Fig. 2b the assembled cover assembly 1.

[0031] How Fig. 2a shows the first cover element 2, in particular the metallic cap 2a, here comprising the corresponding spring elements 6, in particular a clamping rib 6a and also a spring contour 6b. The clamping rib 6a and spring contour 6b are made in particular of a plastic and / or rubber, in particular designed as elastic elements.

[0032] The first and second cover elements 2 and 3 are now designed in particular in such a way that the first cover element 2 can be brought into engagement with the second cover element 3 at least partially before assembly by means of the respective U-shaped sections of the cover elements 2 and 3. In particular Fig. 2b shows, in the assembled state of the cover assembly 1, the then compressed spring contour 6b, but in particular also the contact of the first cover element 2 with the mass, in particular with the housing walls 4 shown here.

[0033] The Fig. 3a and Fig. 3b also show a second preferred embodiment of a cover assembly 1. The Fig. 3a and Fig. The second embodiment shown in Figure 3b is similar to that shown in Fig. 2a and Fig. 2b, therefore, reference may be made to the previous explanations. In particular, the second cover element 3 here has the spring elements 6 designed as clamping ribs 6a, and the first cover element 2 has the spring elements 6 designed as a spring contour 6b, wherein the assembly function is similar to the previously described Fig. 2a and Fig. 2b described functionality.

[0034] However, it is clear from the difference between the Fig. 2a and Fig. 2b to the Fig. 3a and Fig. 3b, that the spring element 6 or the spring elements 6 can be formed and / or arranged on the first and / or also on the second cover element 2 or 3, this depends on the respective specific application and the advantages achieved thereby.

[0035] Finally, the Fig. 4a and the Fig. 4b shows a third and a fourth exemplary embodiment of a lid assembly 1. In particular, the first lid element 2, namely the metallic cap 2a, has a recess 8 and / or an opening for receiving and / or arranging a guide pin 9 of the second lid element 3. With the aid of the guide pin 9 and the recess 8, the relative movement between the lid elements 2 and 3 can be guided in a "correspondingly targeted manner."

[0036] In Fig. 4a, the spring element 6, here a metallic spring element 6c, is arranged on the second cover element 3.

[0037] In Fig. 4b, the spring element 6 is arranged on the first or second cover element 2 or 3. Further spring elements 6 may be provided. Further visible in Fig. 4b is also a U-shaped shielding element 10, here in Fig. 4b is arranged in particular on the second cover element 2, in particular to prevent the passage of electromagnetic radiation through the recess 8. The shielding element 10 can also be formed as an integral component of the second cover element 2; this should be noted.

[0038] In particular, the first and the second cover element 2 and 3 are effectively connected to one another, in particular therefore clipped together and / or partially screwed together, before this cover arrangement 1 thus formed is used for assembly.

[0039] With the help of the cover assembly 1 shown here, housings in particular can be shielded against electromagnetic radiation, in particular a PWR for a motor vehicle can be designed as a "Faraday cage" so that the electromagnetic radiation cannot penetrate or escape from the housing. In this case, the first cover element 2 is then made in particular from a metal, wherein the housing walls of the housing or the other housing walls such as the base of the housing are also made from a metal. However, the use of the cover assembly 1 inside an engine compartment of a motor vehicle is also conceivable, wherein a specific area can then be shielded accordingly with the help of the cover assembly 1 depending on the design of the engine compartment and / or the motor vehicle walls; this should also be noted. List of reference symbols 1 lid arrangement 1a Housing cover arrangement 2 first cover element 2a metallic cap 3 second cover element 3a Plastic lid 4 Housing wall 5 screw connection 6 spring element 6a clamping rib, elastic element 6b Spring contour, elastic element 6c metallic spring element 7 Source of electromagnetic radiation 8 Recess 9 guide bolts 10 Shielding element QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 2 683 228 A2 [0003, 0006] DE 10 2006 030 805 A1

[0004] DE 10 2022 204 199 B3

[0005]

Claims

[1] Cover arrangement (1) for realizing an EMC shield, in particular a housing cover arrangement (1a) for realizing an EMC shield of an electrical and / or electronic component arranged in a housing, vzw.Cover arrangement (1) for a pulse-controlled inverter (PWR) of a motor vehicle, wherein the cover arrangement (1) has at least a first cover element (2), in particular a metallic cap (2a), and at least one second cover element (3), in particular a plastic cover (3a), wherein the first cover element (2) can be brought into at least partial electrically conductive contact with a ground contact, in particular with a housing and / or motor vehicle wall, for shielding and / or dissipating EMC interference and / or electromagnetic radiation and / or is at least partially electrically conductively contacted in the assembled state, and wherein the cover arrangement (1) can be arranged and / or fastened with the aid of the second cover element (3). characterized bythat the cover arrangement (1) is designed and / or constructed in such a way that during assembly of the cover arrangement (1) the first and the second cover element (2, 3) are arranged and / or can be arranged to be movable relative to one another. [2] Cover arrangement according to claim 1, characterized by that at least one spring element (6) acting and / or present between the first and second cover element (2, 3) is arranged and / or present accordingly. [3] Cover arrangement according to claim 1 or 2, characterized by that the spring element (6) is designed as a metallic spring element (6c) or as an elastic element (6a, 6b), in particular made of plastic. [4] Cover arrangement according to one of the preceding claims, characterized by that several spring elements (6) are provided and / or present. [5] Cover arrangement according to one of the preceding claims, characterized bythat the spring element (6) and / or the spring elements (6) are formed and / or arranged on the first cover element (2). [6] Cover arrangement according to one of the preceding claims, characterized by that the spring element (6) and / or the spring elements (6) are formed and / or arranged on the second cover element (3). [7] Cover arrangement according to one of the preceding claims, characterized by that the spring element (6) is designed as a clamping rib (6a). [8] Cover arrangement according to one of the preceding claims, characterized by that the spring element (6) is designed as a spring contour (6b) or as a spring rib. [9] Cover arrangement according to one of the preceding claims, characterized by that the first cover element (2) has a recess (8) and / or opening for receiving and / or arranging a guide pin (9) of the second cover element (3). [10] Cover arrangement according to one of the preceding claims, characterized by that the first and the second cover element (2, 3) are effectively connected to one another, in particular clipped together or partially screwed together.

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