SHIELDING COMPONENT

Description

[0001] The present invention relates to a shielding component, for example a heat shield or sound absorber, which serves to shield an object against heat and / or sound.

[0002] Such shielding components typically have at least one metallic layer. Shielding components with multiple layers are also known, for example, those that enclose an additional absorber layer between two adjacent metallic layers. The outer metallic layers can be connected to each other at their peripheral edges, for example, by crimping. Such shielding components are typically attached to an object by screwing them to the object. The attachment to the object is usually made at at least two connection points in order to attach the shielding component to the object as securely and vibration-free as possible.

[0003] Such shielding components are used primarily to shield other components from the heat or sound emissions of an object. They are particularly frequently used in automotive engineering to shield exhaust manifolds, catalytic converters, or other hot and / or noisy components.

[0004] When heated, the layers of a shielding component expand, resulting in expansion and contraction of the shielding component and, consequently, a lateral relative movement of the shielding component on the object to which it is attached. On the other hand, the attachment points of the shielding component to the object are conventionally rigid. When the shielding component moves, the shielding component, and in particular each of its layers, is subjected to deformation stress. Therefore, deformations, particularly damage such as cracks, can occur particularly at the attachment point of a shielding component during heating and cooling of the shielding component.

[0005] As a conventional solution, the connection points for shielding components, i.e. the openings through the shielding component for receiving a fastening device such as a screw, are designed as an elongated hole. Such an elongated hole allows the shielding component to be offset relative to the object in both directions. The problem with this is that such a compensating movement when the shielding component expands and contracts requires a defined tightening force of the fastening screw, which allows the shielding component to move relative to the object. However, this also means that the shielding component would have to be fastened relatively loosely at each of its connection points relative to the object during assembly. A stronger tightening torque on the fastening screws would result in a secure fit of the shielding component, but could lead to breakage of the shielding component due to the damage described above.A slotted hole as a secondary screw hole only compensates for tolerances during assembly, since there is no "slippage" to compensate for thermal stresses in the assembled state. This slippage due to thermal expansion is usually achieved by a so-called sliding fit, such as a sliding sleeve. However, this has the disadvantage that it cannot be installed precisely in the slotted hole.

[0006] In shielding components according to the prior art, a cardboard layer is therefore often used as the middle layer. It has been shown that such a middle layer can protect the shielding component from breakage. However, this limits the choice of material for the middle layer. WO2017 / 116617A1 discloses a shielding component according to the preamble of claim 1.

[0007] Based on this prior art, the present invention therefore has for its object to provide a shielding component in which a precise and at the same time stable positioning of the shielding component on an object is possible and, on the other hand, the occurrence of deformation stress during expansion or contraction of the heat shield due to heating / cooling does not occur or only occurs to a small, in particular negligible, extent.

[0008] This object is achieved by the shielding component according to claim 1. Advantageous further developments of the shielding component according to the invention are given in the dependent claims.

[0009] The shielding component according to the invention comprises at least one metallic layer. However, it is also possible for the shielding component to comprise multiple layers, in particular multiple metallic layers and possibly also additional non-metallic layers. A typical configuration for a shielding component comprises two outer metallic layers that are crimped or otherwise connected to one another at their peripheral edges and enclose an insulating layer, for example, a mica layer, a fiber layer, a cardboard layer, or the like, between them.

[0010] At least one first through-opening is arranged in the first metallic layer as the first layer, which serves to pass through a fastening means. In a multi-layer shielding component, the through-opening extends through all layers, whereby the contour of the through-opening does not have to be identical in every layer, but can be. The first metallic layer and, if applicable, the further layers can also have further through-openings for fastening means, which can be identical, the same, similar, or dissimilar to the first through-opening.

[0011] According to the invention, the first through-opening is now designed as a freely formed opening in that it has at least one projection on its peripheral edge, so that the through-opening is tapered at this projection between the opposite sides of the peripheral edge of the through-opening, ie the distance between the opposite sides of the peripheral edge of this first through-opening in the region of the projection is smaller than the distance between the opposite regions of the peripheral edge of this first through-opening adjacent to the projection.

[0012] In other words, the first through-opening, at least in the first metallic layer, is designed as a shaped hole in such a way that it has a taper or constriction, ie the shaped hole is constricted at at least one point.

[0013] Such a taper can of course also be achieved by providing a projection on opposite sections of the peripheral edge of the first through-opening, wherein the distance between the two opposite projections is smaller than the distance between adjacent regions of the peripheral edge of the first through-opening, which are also opposite one another on one side of the two projections.

[0014] The projections according to the invention, for example, lugs, and also referred to as such below, can be produced in the first metallic layer in particular by stamping the first metallic layer into the through-opening at the peripheral edge of the first through-opening in the region of these lugs. They can also be produced by punching a corresponding free-form shaped hole, including the projection(s), directly from the metallic layer during the production of the first metallic layer of the shielding component. Other manufacturing methods are also possible.

[0015] Advantageously, the elastic and plastic behavior of the projections can be suitably adjusted by selecting the length and / or width of the projections and / or the layer thickness, at least in the area of ​​the projections, and, for example, by introducing additional material recesses (holes) in the area of ​​the projections. The projections narrow the through opening by 10% to 20%, advantageously by 12% to 15%.

[0016] The shielding component now makes it possible to mount the shielding component in a defined position during assembly on an object. For this purpose, a fastener is passed through a first through-opening region located to one side of the projections. This first through-opening region can be designed like conventional fastening holes such that the fastener, for example a screw, rivet, or the like, is fixed in this through-opening in the layer plane of the first layer with only slight play. This clearly and precisely defines the mounting position, making installation of the shielding component easy and precise. This precise positioning ensures high quality standards during production and assembly.

[0017] At the same time, it is possible for the shielding component to shift when sufficiently high forces occur, particularly when the shielding component or the object expands due to heating. This causes the fastening means to press against the projection(s) and possibly plastically deform them. The fastening means can thus shift within the first through-opening in the direction of the second through-opening region. This is possible due to the receiving element for the fastening means being displaceable in the plane of the first layer, particularly if a sliding seat is arranged in the first through-opening through which the fastening means is passed. This can, for example, be a two-part sleeve, the two parts of which project differently and are joined to one another, for example pressed, and which can be shifted as described under the high forces that occur.

[0018] In other words, after the shielding element has been mounted on an object, subsequent movement of the layers of the shielding component is still possible. The force required for this can be adjusted, as described above, via the plastic and elastic properties of the projection(s), for example, their stiffness.

[0019] By designing the constriction in the form of a projection or, if necessary, several projections and thus a constriction of the first through-opening, it is possible for the projection(s) to be plastically deformed by the fastening means and for the material of the projection to be at least partially displaced into the second through-opening region of the first through-opening facing away from the fastening means. This prevents the first metallic layer or, if necessary, the other layers of the shielding component from being deformed outside the projection(s) when the shielding component expands, thereby simultaneously preventing damage to the shielding component. This increases the reliability and service life of the shielding component.

[0020] The second passage area, which is opposite the first passage area as seen from the projection, thus serves as a displacement space for the material of the projection(s). With a suitable design of the projection(s), it is also possible that, in a multi-layer shielding component, for example, a three-layer shielding component, the material of the projection(s) is / are at least partially displaced into the plane of adjacent layers upon expansion of the shielding component.

[0021] It is also essential that, by means of such a design of the first through-opening, the fastening means displaces the projection or projections only to such an extent that the fastening means, in the displaced state, for example after expansion of the shielding component, is encompassed by the peripheral edge of the first through-opening in the region of the projection or projections with only slight play.

[0022] In the previous description of the fastening of the shielding component according to the invention to an object, the case was mentioned in which a fastening means, such as a screw, is passed through the first through-opening and thus fixes the shielding component to the object. According to the invention, the shielding component additionally has a receiving element for the fastening means in the first through-opening, for example a sleeve, which can be displaced in the plane of the first layer. Such a sleeve can be made up of one or more pieces and enables the fastening element to be displaced together with the sleeve within the first through-opening. Alternatively, a system of washers can also be provided as the displaceable receiving element, which can be arranged on the one hand between the screw head and the shielding element and on the other hand between the shielding element and the object.These washers can protrude into the first through-opening in the area of ​​the first through-opening and, in the same way as a previously described single- or multi-part cover, limit the compression of the shielding element by the fastening element. This determines the mobility of the fastening element together with the receiving element in the first through-opening and ensures compliance with the requirements for the accuracy of the installation of the shielding component on the object.

[0023] According to the invention, even in a multi-part shielding component, at least the first layer must have a first through-opening as described above. The additional layers must also have corresponding through-openings to create a through-opening for a fastening means that extends through the entire shielding component. The additional layers can have through-openings of the same shape. However, for the functionality of the present invention, it is not absolutely necessary for the through-openings through the additional layers to also have the projection(s) according to the invention.

[0024] It is also possible for an additional attachment point to have a conventional, round through-hole for a fastener. After the shielding component is attached to the object, this forms a fixed point relative to which the shielding element can expand or shrink. In this case, it is advantageous if the connection axis between the first and second through-holes is aligned with this fixed point.

[0025] Some examples of shielding components according to the invention are given below. Identical or similar reference numerals designate identical or similar elements, so that their descriptions may not be repeated. The following examples each show an exemplary combination of mandatory and optional features of the present invention. However, it is possible to combine individual optional features of the respective example with one or more optional features of the same example or other examples, without requiring the use of all features of the respective example in combination.

[0026] It shows Fig. 1 shows a heat shield (shielding component) according to the invention in a section and in plan view of a connection point in a first metallic layer; Fig. 2 shows a further shielding component according to the invention in a section view in a section; Fig. 3 shows a cross section through a receiving element of the heat shield in Fig. 1A ; Fig. 4 shows a further shielding component according to the invention in a sectional view and in a plan view in a detail; Fig. 5 shows a further shielding component according to the invention in a sectional view and in a plan view in a detail; Fig. 6 shows a shielding component according to the invention in an installed position in a cross-section and in a detail; Fig. 7 shows a further shielding component according to the invention in an installed position in a cross-section and in a detail; Fig. 8 shows a further shielding component according to the invention in an installed position in a cross-section and in a detail. Fig. 9 shows a heat shield according to the invention; Fig. 10 shows a further shielding component according to the invention in a plan view and in a detail; Fig. 11 shows a further shielding component according to the invention in a plan view and in a detail; Fig. 12 shows the shielding component of the Fig. 1B with advantageous dimensions; Fig. 13 the shielding component of the Fig. 1B with further advantageous dimensions; and Fig. 14 shows a further shielding component according to the invention in plan view and in detail.

[0027] Fig. 1 shows in the partial figures 1A and 1B a single-layer heat shield 1 as an example of a shielding component in plan view and in a section around a connection point to which the heat shield 1 can be attached to an object or component.

[0028] In Fig. 1A The detail shows a plan view of a first metallic layer 2 of the heat shield 1 in the region of a screw hole 3 as a connection point. The screw hole 3 as a through-opening has a free form, in which the through-opening 3 has an elongated shape along a connecting axis 30. At two sections opposite each other along the edge 7 of the through-opening, the first metallic layer 2 has two lugs 4a, 4b, which together taper the through-opening 3. The through-opening 3 thus has two regions, a through-opening region 5 for the passage of a fastening means to one side of the projections 4a and 4b, and a through-opening region 6, which, viewed from region 5, is arranged behind the taper created by the lugs 4a and 4b. The through-opening regions 5 and 6 are now connected to one another along the aforementioned connecting axis 30 between the projections 4a and 4b.

[0029] The lugs 4a and 4b are punched out of the first layer together with the first through-opening. However, it is also possible to first introduce the through-opening 3 as an elongated hole without lugs into the first layer 2 and then to stamp the lugs 4a and 4b as projections from the first layer 2. Alternatively, the lugs 4a and 4b can also be created by upsetting the peripheral edge 7 or can be created during the production of the through-opening 3, e.g., by introducing the through-opening 3 in a suitable shape into the metallic sheet of the first metallic layer 2 during the production of the first metallic layer 2, e.g., by punching it.

[0030] The passage area 5 has a shape such that a sleeve 21 can be arranged therein as a receiving element 20. The inner diameter of the sleeve 21 is designed such that a fastening means, for example a screw, can be passed through the sleeve 21.

[0031] The projections 4a and 4b are designed such that the sleeve 21 and the diameter of the passage area 5 in the passage opening 3 are so large that they cannot be displaced in the direction of the passage area 6 without additional force. Because the sleeve 21 is fixed in the opening 3 in the region of the passage area 5, an initial secure and precisely positioned attachment of the heat shield 1, e.g., screwing, to an object is possible.

[0032] During later use, the heat shield 1 may heat up or cool down and thus expand or shrink. This results in shear forces on the heat shield and its layers, which, for example, can occur when the first layer 2 is displaced in Fig. 1A in the direction of the connecting axis 30 between the area 5 and the area 6, the heat shield 1 with its first metallic layer 2 in Fig. 1A Press to the left onto the sleeve. According to the invention, the metallic layer 2 can now be displaced toward the sleeve 21, whereby the material of the lugs 4a and 4b is pressed by the sleeve 21 toward the passage area 6.

[0033] The present invention thus makes it possible to initially attach the heat shield 1 to an object in a precisely positioned manner and, during subsequent use, to still allow the heat shield 1 to be displaced relative to a fastening means and relative to the object along the connection axis 30, thus relieving stresses from the first metallic layer 2 and, if necessary, the entire heat shield 1. This prevents cracks and fractures from occurring in the first metallic layer 2, which could lead to the destruction of the heat shield 1.

[0034] As far as the expansion and shrinkage of the first metallic layer 2 caused by heating and its relative displaceability to the sleeve 21 were discussed above, it is of course also possible that the object to which the heat shield 1 is fastened, for example when heated, carries out a movement and thus moves relative to the first metallic layer 2 via the fastening means and the sleeve 21.

[0035] Fig. 1B shows the dimensions of the through opening 3.

[0036] The distance A2 between the two projections 4a and 4b is selected such that it is smaller than the distance A3 of opposite sections of the edge 7 in an adjacent area to the projections 4a and 4b in the passage areas 5 and / or 6. In particular, the distance A1 largely corresponds to the outer diameter of the sleeve 21 in Fig. 1A so that the sleeve 20 has a predetermined position during the initial assembly of the heat shield 1.

[0037] The distance D1, i.e. the diameter of the passage area 5 along the connecting axis 30 from a point between the projections 4a, 4b and the opposite circumferential edge 7 of the passage area 5, is also selected such that the sleeve 21 is fixed in its position. The length D2 of the passage area 6 in the direction of the connecting axis 30 from a point between the projections 4a, 4b and the circumferential edge 7, i.e. the diameter of the passage area 6 along the connecting axis 30, can be kept small, in particular smaller than the diameter D1 of the passage area 5 in the connecting axis 30, since the passage area 6 merely forms an escape space for the sleeve 20 or the fastening means and a displacement space for the lugs 4a and 4b.

[0038] In the area of ​​the passage area 6, the diameter A1 of the passage area 6 perpendicular to the connecting axis 30 is greater than the distance A2 between the two projections 4a and 4b. As a result, the passage area 6 forms a displacement space for the material of the lugs 4a and 4b.

[0039] The lugs 4a and 4b each protrude by a length V beyond the peripheral edge 7 of the through-hole 3 adjacent to the lugs into the through-hole 3, so that A1 = A2 + 2V applies. This projection V is selected such that the sleeve 21, as shown in Fig. 1A shown, is initially fixed at a secured position.

[0040] Fig. 2 shows a cross section around the connection point of another heat shield similar to the heat shield in Fig. 1 . Instead of a single-layer heat shield, a three-layer heat shield 1 is shown here with a first metallic layer 2a, a second metallic layer 2b and a third intermediate layer 9 enclosed between these two metallic layers 2a and 2b. The metallic layers 2a and 2b as well as the intermediate layer 9 are of identical design in the region of the through-opening 3, so that all three layers have lugs 4a and 4b.

[0041] The intermediate layer 9 can, for example, consist of or comprise paper, cardboard, fleece, mica, and the like. It serves to further improve the shielding effect of the heat shield 1 with regard to heat and sound. In the area of ​​the through-opening 5, the two layers 2a and 2b are identically formed, so that the description of only the first metallic layer 2a is sufficient in this regard. The layer 2a is formed in the area of ​​the through-opening 5 in the same way as the first layer 2 in Fig. 1 .

[0042] The two layers 2a and 2b are connected to each other at their edges by means of a fold 8 of layer 2b around the edge of layer 2a and thus securely enclose the intermediate layer 9 between them.

[0043] The cross section shown in Fig. 2 is a cross section in the connecting axis 30 from Fig. 1 . The Fig. 2 represents the heat shield 1 in an initial, unassembled state. Deviating from Fig. 1 The sleeve 21 is now formed in two parts with an upper sleeve part 21a and a lower sleeve part 21b. The sleeve is in Fig. 2 shown state by the noses 4a and 4b, which cannot be seen in this cross section, Fig. 1 held in the passage area 5 of the passage opening 3.

[0044] Fig. 3 shows the two sleeve parts 21a and 21b of the heat shield 1 in Fig. 2 in a state in which they have not yet entered the through opening 3 of the Fig. 2 are inserted. Both sleeve parts 21a and 21b have a flange-like area 23a, 23b and a sleeve neck 24a or 24b. The sleeve neck 24a has a smallest inner diameter that is larger than the largest outer diameter of the sleeve neck 24b, measured in each case along a line running around the interior of the respective sleeve neck 24a, 24b somewhat centrally between the flange 23a or 23b and the end 25a or 25b of the respective sleeve neck 24a or 24b. The second sleeve part 21b is folded (alternatively: chamfered) at the end 25b of the sleeve neck 24b towards the interior volume of the sleeve as an insertion aid, so that it can be easily inserted into the sleeve part 21a during assembly in the through-opening 3. To fasten the two sleeve parts 21a and 21b together, the end 25b is then formed outwards so that it is as in Fig. 2 shown, overlaps the transition between the flange 23a and the sleeve section 24a.

[0045] The distance between the two flanges 23a and 23b is Fig. 2 selected such that the sleeve 21 is easily displaceable in the through-opening 3, thus forming a sliding fit for a fastening means, such as a screw. The selection of the distance between the flanges 23a and 23b enables, in particular, thermal expansion or displaceability of the layers 2a, 2b, and 9 relative to the sleeve 21.

[0046] Fig. 4 shows a plan view of the first metallic layer 2a of the heat shield 1 from the Figuren 2 and 3 in top view ( Fig. 4A ) and in cross-section ( Fig. 4B ). The cross section in Fig. 4B is a cross section through the heat shield 1 along the line AA in Fig. 4A .

[0047] Fig. 5 shows another example of a heat shield 1 according to the invention. This heat shield 1 is designed similarly to the one in Fig. 4 and in the same way as in Fig. 4 shown.

[0048] In contrast to the heat shield in Fig. 4 However, only the first layer 2a has the lugs 4a and 4b, while the second metallic layer 2b and the intermediate layer 9 do not have any projections 4a, 4b. However, projections in the first metallic layer 2a are sufficient to ensure the initial seating of a receiving element 20, such as a sleeve, or a fastening means 10, such as a screw.

[0049] The dashed line of edge 7 in Fig. 5A represents the contour of the layers 2b and 9, while the solid line of the edge 7 of the through opening 3 represents the contour of the through opening 3 in the first layer 2a.

[0050] In Fig. 5A the contour of a receiving element 20 or a fastening means 10 is also shown.

[0051] Fig. 6 shows a heat shield 1 as in Fig. 2 in an installation situation on a component or object 11 in cross-section and in the cutout around a connection point. In Fig. 6 The heat shield 1 is shown after attachment to object 11. The component 11, for example an engine block, has a bore 12 which serves to receive a threaded screw 10. The length of the screw 10 and the threaded bore 12 is selected such that the screw can be fully inserted into the threaded bore 12 until its screw head rests on the sleeve 21. In order to center the screw 10 in the threaded bore, it has a chamfer 13 between the screw head and the thread as an insertion aid. The further design of the heat shield is as shown in the Figuren 2 bis 4 shown.

[0052] The sleeve 21 serves here to ensure that the layers 2a, 2b and 9 of the heat shield 1 are displaceable within the sleeve 21, whereby the force required for the displacement can be adjusted by the distance between the sleeve parts 21a and 21b as well as the thickness and elasticity / plasticity of the heat shield in the area between the flanges 23a and 23b.

[0053] Fig. 7 shows another example of a shielding component according to the invention as a heat shield. This is similar to that in Fig. 6 However, the heat shield 1 does not have a sleeve 21. Instead, the screw 10 is guided directly through the through hole 3 and screwed into a threaded hole 12 of the component 11. In contrast to Fig. 6 Now, not only does the transition from the screw head to the screw thread have a chamfer 13, which serves as an insertion and centering aid, but also the transition between the surface of the component 11, against which the second layer 2b rests, and the threaded hole 12. The chamfer 13 of the screw 10 and the chamfer 14 of the threaded hole 12 serve as a stop to limit the countersinking of the screw 10 in the threaded hole 12. In this way, the distance between the screw head and the object 11 and thus also the force with which the screw 10 acts on the heat shield 1 is limited. With a suitable selection of this force, a predetermined, defined mobility of the heat shield 1 relative to the screw 10 and component 11 is permitted. In this case, too, the screw 10 sits displaceably in the through-opening 3 relative to the heat shield 1.

[0054] Fig. 8 shows another example of a heat shield 1, similar to the one in Fig. 6 constructed and mounted on a component 11. In this example too, only the bore 12 has a chamfer 13, which serves as an insertion and positioning aid. The screw 13 does not have a corresponding chamfer. Rather, the length of the screw 10 and the depth of the threaded bore 12 are coordinated in such a way that the bottom of the threaded bore 12 forms a stop for the screw 10. With suitable dimensioning of the threaded bore 12 and screw 10, it is therefore possible to adjust the distance between the screw head and component 11 and thus to set a defined force of the screw head of the screw 10 on the heat shield 1. With a suitable selection of the force, which can be conventionally determined from the properties of the heat shield, a displaceable seat of the screw 10 in the heat shield 1 is also realized.

[0055] Fig. 9 shows another heat shield (shielding component) 1 according to the invention.

[0056] This heat shield 1 is shown in an isometric view of the first layer 2a. This heat shield 1 is a three-layer heat shield, the intermediate layer and second layer of which are not visible behind the first layer 2a in this view.

[0057] The heat shield 1 has a first through-opening 3 in all layers, which, like the one in Fig. 1A shown through-opening 3. In this through-opening 3, as in Fig. 1A , a receiving element in the form of a sleeve 21 is arranged as part of a sliding seat.

[0058] Approximately in the connecting axis between the two receiving areas 5 and 6 of the through-hole 3, another conventional, round through-hole 3b is arranged. This through-hole does not have a sliding fit and essentially fixes the position of a fastening element located in the through-hole 3b. The heat shield 1 can be attached to a component by means of the through-hole 3b.

[0059] However, due to the sliding fit 21 in the through-opening 3, the shielding component is movable in the connecting axis between the two through-openings 3 and 3b relative to the component to which the heat shield 1 is attached, for example, if in this case the heat shield contracts or the component expands.

[0060] Fig. 10 shows another heat shield 1 in plan view of the first layer 2 and in the cutout around a through opening 3, as also shown in Fig. 4 In contrast to Fig. 4 However, the lugs 4a and 4b each have recesses 15a and 15b, respectively. These recesses (holes) 15a and 15b allow the elasticity and plasticity of the lugs 4a and 4b to be specifically adjusted and thus the forces required to displace a fastening element in the through-hole 3 to be determined.

[0061] The recesses 15a and 15b can be in the noses 4a and 4b or as in Fig. 10 shown can also be arranged directly adjacent to them.

[0062] Fig. 11 shows a further shielding component 1 in plan view of the first layer 2 and in the cutout around the through opening 3, which is similar to the one in Fig. 4 In contrast to the Fig. 4 The noses 4a and 4b are produced by pressing (or stamping) the Fig. 11 hatched areas 16a and 16b, so that in these areas 16a and 16b the material thickness of the first layer 2 is reduced.

[0063] Fig. 12 shows a further shielding component 1 in the cutout around the through-opening 3 and in plan view of the first layer 2. The design of the through-opening 3 corresponds to that in Fig. 4 . Deviating from Fig. 4 are in Fig. 12 Additionally, specific dimensions are given in millimeters. From the dimensions given here, it follows that the diameter of the through-hole 3 between the lugs 4a and 4b is reduced by approximately 7.4% each, and thus by a total of 14.8%, compared to an area adjacent to the lugs 4a and 4b.

[0064] Fig. 13 shows the shielding component 1 from Fig. 12 also in the same top view of the first layer 2 in the cutout around the through opening 3. Deviating from Fig. 4 In addition, a receiving element 21, for example a sleeve, is arranged in the through-opening 3 as a sliding seat in the through-opening area 5 of the through-opening 3. The dimensions of this receiving element 21 and the through-opening 3 in the plane of the first layer 2 are shown in Fig. 13 From this dimensioning, it follows that the outer circumference of the receiving element 21 is 7.4% smaller than the diameter of the passage area 5 and 13.6% larger than the diameter of the passage opening 3 between the two lugs 4a and 4b.

[0065] Fig. 14 shows a further shielding component 1 in plan view of the first layer 2 and in the cutout around the through opening 3, which, like the one in Fig. 4The through-opening 3 is shown with its outer circumference 7 in dashed lines. Above and below the through-opening 3 there is a disc 17, the inner circumference 18a and outer circumference 18b of which are each shown in solid lines. These discs 17 can serve as receiving elements for a movable seat of a fastening means guided through the through-opening 3. The end of the sleeve neck 25a is shown adjacent to the inner circumference 18a as a dashed line.

Claims

1. A shielding component (1), in particular a heat shield, for shielding an object (11) against heat and / or sound, the shielding comopnent having at least one metallic layer (2), wherein at least one first through-opening (3) for the passage of a fastening means (10) is arranged in the metallic layer (2), as the first layer, wherein the first through-opening (3), in at least one section of its circumferential edge (7), has a projection (4) in the direction of the opposite side of the circumferential edge (7) such that the distance (A2) between the opposite sides of the first through-opening (3) in the region of the constriction (4, 4a, 4b) created by the projection (4) or the projections (4a, 4b) is 10% to 20% smaller than on both sides immediately adjacent to the constriction (4, 4a, 4b) or than on both sides of the maximum diameter (A1) of the through-opening (3) in each of the two passage regions (5, 6) adjacent to the constriction (4, 4a, 4b), wherein the through-opening (3) has a passage region (5, 6) on each side of the constriction created by the projection (4), wherein at least one of the passage regions (5) is designed for the passage of the fastening means (10); characterized in that a receiving element (20) for the fastening means (10) is arranged in or on a passage region (5) of the through-opening (3) formed for the passage of the fastening means (10), wherein the receiving element (20) is displaceable in the plane of the first layer (2).

2. The shielding component (1) according to the preceding claim, characterized in that the displaceable receiving element (20) is a single-part or multi-part sleeve (21) or discs arranged on both sides of the first layer (2).

3. The shielding component (1) according to any one of the preceding claims, characterized in that the first through-opening (3) has, in two sections of its circumferential edge (7), a projection (4a, 4b) in the direction of the respective opposite side of the circumferential edge (7)such that the distance (A2) of the two projections from one another is smaller than the distance (A1) between the opposite sides of the first through-opening (3) on both sides of the two projections, wherein the two projections (4a, 4b) are advantageously arranged opposite one another.

4. The shielding component (1) according to one of the preceding claims, characterized in that a passage region (5) formed for the passage of the fastening means (10) or, if applicable, the receiving element (20), has a minimum diameter that enables the fastening means (10) to be seated in the first layer (2) or in the receiving element (20).

5. The shielding component (1) according to any one of the preceding claims, characterized in that a passage region (6) adjacent to a passage region (5) formed for the passage of the fastening means (10) has a diameter in the connecting axis between the two passage regions (5, 6) from the constriction (4, 4a, 4b) to its circumferential edge (7) that is smaller than the diameter of the passage region (5) formed for the passage of the fastening means (10) in the connecting axis (30) between the two passage regions (5, 6) from the constriction (4, 4a, 4b) to its circumferential edge (7).

6. The shielding component (1) according to any one of the preceding claims, characterized in that the diameter (A2) of the first through-opening (3) at the constriction (4, 4a, 4b) is 12% to 15% smaller than the diameter of the first through-opening on both sides immediately adjacent to the constriction (4, 4a, 4b) or than the diameter of the first through-opening on both sides of the maximum diameter (A1) of the first through-opening (3) in each of the two passage regions (5, 6) adjacent to the constriction (4, 4a, 4b).

7. The shielding component (1) according to any one of the preceding claims, characterized in that one, several or all of the projections (4, 4a, 4b) are produced by pressing / embossing / compressing the circumferential edge (7) of the through-opening (3) or by punching during the production of the through-opening (3).

8. The shielding component (1) according to any one of the preceding claims, characterized in that one, several or all of the projections (4, 4a, 4b) have a thinned region or a hole.

9. The shielding component (1) according to any one of the preceding claims, characterized in that at least one second through-opening (3b) for the passage of a fastening means (10b) is arranged in the first layer (2), advantageously in the connecting axis (30) between two passage regions (5, 6) of the first through-opening (3).

10. The shielding component (1) according to the preceding claim, characterized in that the second through-opening (3b) has, in at least one section of its circumferential edge (7b), a projection (4) in the direction of the opposite side of the circumferential edge (7b) such that the distance between the opposite sides of the second through-opening (3b) is smaller in the region of the projection (4c) than on either side of the projection (4c).

11. The shielding component (1) according to any one of the preceding claims, characterized in that it has at least one further layer (2b), wherein one, several or all of the further layers (2b) have a through-opening (3b) in the axial direction of one, several or all through-openings (3, 3a, 3b) of the first layer (2a) for the passage of the fastening means (10) and / or the receiving element (20).

12. The shielding component (1) according to any one of the two preceding claims, characterized in that the second through-opening (3b) and / or the through-opening (3c) in the further layer (2b) or all layers (2a, 2b) has a projection (4) in at least one section of its circumferential edge (7) in the direction of the opposite side of the circumferential edge (7) such that the distance (A2) between the opposite sides of the second and / or further through-opening (3b) in the region of the projection (4) is smaller than the distance between the opposite sides of the second and / or further through-opening (3b) on both sides of the projection (4).