Front wall heat insulation pad and vehicle

Abstract

The front wall heat insulation pad comprises a sound insulation layer and a first sound absorption layer, the first sound absorption layer is arranged on one side of the sound insulation layer in the thickness direction and connected with the sound insulation layer, and the first sound absorption layer is of an acoustic metamaterial structure. According to the front wall heat insulation pad, the thickness of the front wall heat insulation pad can be reduced while it is guaranteed that the first sound absorption layer has the good sound absorption capacity, and therefore the space, occupied by the thin front wall heat insulation pad, in a vehicle is reduced, and arrangement of parts in the vehicle is facilitated; the front wall heat insulation pad can be made of a low-density material, so that the weight of the front wall heat insulation pad is reduced, and the weight of a vehicle with the front wall heat insulation pad is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a front wall heat insulation pad and a vehicle. Background Art

[0002] The front heat insulation pad is located between the cab and the engine compartment, and can isolate part of the radiated noise from the engine compartment. However, relying solely on the front heat insulation pad for sound insulation cannot meet the noise reduction level requirements in the cab. In the related art, the front heat insulation includes a sound absorption layer and a sound insulation layer. The sound absorption layer is a foam layer, and the sound insulation layer is a honeycomb layer. By increasing the thickness of the foam layer, the sound insulation performance of the front heat insulation is improved, resulting in a larger overall thickness and weight of the front heat insulation, which in turn causes the front heat insulation pad to not only occupy more space in the vehicle, which is not conducive to the layout of the components in the vehicle, but also increase the weight of the vehicle body. Utility Model Content

[0003] To this end, the utility model proposes a front wall heat insulation pad to reduce the thickness of the front wall heat insulation pad and reduce the weight of the front wall heat insulation pad.

[0004] The front wall heat insulation pad of the utility model comprises a sound insulation layer and a first sound absorption layer, wherein the first sound absorption layer is arranged on one side of the sound insulation layer in the thickness direction and connected to the sound insulation layer, and the structure of the first sound absorption layer is an acoustic metamaterial structure.

[0005] Optionally, the first sound absorbing layer includes a frame, a thin film layer, a mass block and a swing arm, the frame is arranged on one side of the thickness direction of the thin film layer and is connected to the thin film layer, the frame forms a unit cell, the mass block and the swing arm are both arranged in the unit cell and are connected to the thin film layer.

[0006] Optionally, the swing arm is in a cross shape, and the number of the mass blocks in each cell is eight, and the eight mass blocks are evenly arranged along the circumference of the swing arm.

[0007] Optionally, the swing arm includes eight support arms, the eight support arms are arranged in a cross-shaped pattern, and the mass block and the support arms are arranged at intervals along the circumference of the swing arm.

[0008] Optionally, the frame is a grid frame, the grid frame is surrounded by a plurality of cells, and each cell is provided with the mass block and the swing arm.

[0009] Optionally, the cells are arranged in a matrix.

[0010] Optionally, the frame, the mass block and the swing arm are arranged on the same side in the thickness direction of the film layer.

[0011] Optionally, the front enclosure thermal insulation pad further includes a second sound absorbing layer, which is a foaming layer. The second sound absorbing layer is arranged on one side of the first sound absorbing layer in the thickness direction and is connected to the first sound absorbing layer.

[0012] Optionally, the second sound absorbing layer is disposed between the sound insulation layer and the first sound absorbing layer, and is connected to the sound insulation layer; and / or the second sound absorbing layer is bonded to the first sound absorbing layer.

[0013] Optionally, the sound insulation layer is a honeycomb panel.

[0014] The utility model also provides a vehicle.

[0015] The vehicle of the utility model comprises the front wall heat insulation pad described in any one of the above items.

[0016] The front wall heat insulation pad of the utility model is provided with a first sound absorbing layer on one side of the thickness direction of the sound insulation layer, and the structure of the first sound absorbing layer is set as an acoustic metamaterial structure, and the acoustic metamaterial structure has good sound absorption ability for medium and low frequency noise, thereby improving the sound absorption and noise reduction effect of the front wall heat insulation pad and reducing the noise inside the vehicle with the front wall heat insulation pad. On the one hand, compared with the foaming layer, the acoustic metamaterial has a smaller size and a higher energy dissipation rate. While ensuring that the first sound absorbing layer has good sound absorption ability, the thickness of the front wall heat insulation pad can be thinned, thereby reducing the space inside the vehicle occupied by the thin front wall heat insulation pad, which is beneficial to the arrangement of the components inside the vehicle; on the other hand, the sound absorption ability of the acoustic metamaterial is independent of the material. While ensuring that the first sound absorbing layer has good sound absorption ability, it can be made of a low-density material to reduce the weight of the front wall heat insulation pad, thereby reducing the weight of the vehicle with the front wall heat insulation pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a front wall heat insulation pad according to an embodiment of the utility model.

[0018] Figure 2 It is a cross-sectional view of a front wall heat insulation pad according to another embodiment of the utility model.

[0019] Figure 3 yes Figure 1 and Figure 2 Schematic diagram of the structure of the first sound absorbing layer.

[0020] Figure 4 yes Figure 3 A three-dimensional diagram of a mid-swing arm unit cell.

[0021] Figure 5 yes Figure 3 Front view of the mid-swing arm unit cell.

[0022] Reference numerals:

[0023] 10. Front wall insulation pad;

[0024] 1. Sound insulation layer;

[0025] 2. first sound absorbing layer; 21. frame; 22. film layer; 23. mass block; 24. swing arm;

[0026] 3. The second sound absorbing layer. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0028] like Figure 1 and Figure 2 As shown, the front enclosure thermal insulation pad 10 of the embodiment of the utility model includes a sound insulation layer 1 and a first sound absorption layer 2. The first sound absorption layer 2 is arranged on one side of the sound insulation layer 1 in the thickness direction and is connected to the sound insulation layer 1. The structure of the first sound absorption layer 2 is an acoustic metamaterial structure.

[0029] The front wall heat insulation pad 10 of the embodiment of the utility model is provided with a first sound absorbing layer 2 on one side of the thickness direction of the sound insulation layer 1, and the structure of the first sound absorbing layer 2 is set as an acoustic metamaterial structure, and the acoustic metamaterial structure has good sound absorption ability for medium and low frequency noise, thereby improving the sound absorption and noise reduction effect of the front wall heat insulation pad 10 and reducing the noise in the vehicle with the front wall heat insulation pad 10. On the one hand, compared with the foam layer, the acoustic metamaterial has a smaller size and a higher energy dissipation rate. While ensuring that the first sound absorbing layer 2 has good sound absorption ability, the thickness of the front wall heat insulation pad 10 can be thinned, thereby reducing the space in the vehicle occupied by the thin front wall heat insulation pad 10, which is beneficial to the arrangement of the components in the vehicle; on the other hand, the sound absorption ability of the acoustic metamaterial is independent of the material. While ensuring that the first sound absorbing layer 2 has good sound absorption ability, it can be made of a low-density material to reduce the weight of the front wall heat insulation pad 10, thereby reducing the weight of the vehicle with the front wall heat insulation pad 10.

[0030] Alternatively, if Figures 3 to 5 As shown, the first sound absorbing layer 2 includes a frame 21, a film layer 22, a mass block 23 and a swing arm 24. The frame 21 is arranged on one side of the film layer 22 in the thickness direction and is connected to the film layer 22. The frame 21 is surrounded by a unit cell, and the mass block 23 and the swing arm 24 are both arranged in the unit cell and are connected to the film layer 22. Among them, the entire acoustic metamaterial can be regarded as a "spring-mass" system, the film layer 22 is equivalent to the "spring", the mass block 23 is equivalent to the "mass", and the frame 21 is mainly used to fix the film layer 22.

[0031] That is to say, the acoustic metamaterial is a membrane-type acoustic metamaterial (MAM), so that when the thickness of the thin film layer 22 is relatively small, it still has good low-frequency sound insulation performance, thereby further reducing the thickness of the first sound absorbing layer 2 and reducing the space inside the vehicle occupied by the thin front enclosure thermal insulation pad 10, which is more conducive to the layout of components inside the vehicle.

[0032] Optionally, the frame 21 and the swing arm 24 are both made of EVA (ethylene-vinyl acetate copolymer), the film layer 22 is made of PI (polyimide), and the mass block 23 is a metal sheet.

[0033] The frame 21, the film layer 22, the mass block 23 and the swing arm 24 are made of the above-mentioned materials, which is beneficial to reducing the weight of the first sound absorbing layer 2 while ensuring that the first sound absorbing layer 2 has good low-frequency sound insulation performance, and further reducing the weight of the vehicle with the front heat insulation pad 10.

[0034] Optionally, the thickness of the first sound absorbing layer 2 is 2 mm to 2.5 mm.

[0035] For example, the thickness of the first sound absorbing layer 2 is 2.2 mm.

[0036] By setting the thickness of the first sound absorbing layer 2 to 2 mm to 2.5 mm, it is advantageous to reduce the thickness of the cowl insulation pad 10 .

[0037] Alternatively, if Figures 3 to 5 As shown, the swing arm 24 is in a cross shape, and the number of mass blocks 23 in each unit cell is eight, and the eight mass blocks 23 are evenly arranged along the circumference of the swing arm 24.

[0038] It is understandable that when a mass block 23 is set in a cell, its sound insulation band is usually narrow, and it only has a good sound absorption and noise reduction effect on noise in a smaller frequency band. By setting the swing arm 24 in a cross shape and evenly arranging eight mass blocks 23 around the swing arm 24, the sound insulation band width of the first sound absorbing layer 2 can be widened, thereby improving the sound absorption and noise reduction effect of the front wall heat insulation pad 10.

[0039] Alternatively, if Figures 3 to 5 As shown, the swing arm 24 includes eight support arms, which are arranged in a cross shape, and the mass block 23 and the support arms are arranged at intervals along the circumference of the swing arm 24.

[0040] The above arrangement of the swing arm 24 and the mass block 23 can further broaden the sound insulation bandwidth of the first sound absorbing layer 2 , thereby further improving the sound absorption and noise reduction effect of the front wall thermal insulation pad 10 .

[0041] Alternatively, if Figure 3As shown, the frame 21 is a grid frame, which is surrounded by a plurality of cells, and each cell is provided with a mass block 23 and a swing arm 24.

[0042] For example, Figure 4 and Figure 5 As shown, one unit cell, the film layer 22 corresponding to the unit cell, the mass block 23 disposed in the unit cell, and the swing arm 23 disposed in the unit cell constitute a swing arm type unit cell. Figure 3 As shown, the first sound absorbing layer 2 is formed by a single swing-arm unit cell through two-dimensional periodic extension. The dimensions of the swing-arm unit cell can be: the side length of the frame 21 is 100 mm, the width is 5 mm, and the thickness is 2 mm; the side length of the film layer 22 is 100 mm, and the thickness is 0.2 mm; the radius of the mass block 23 is 8 mm, the thickness is 2 mm, and the distance from the mass block 23 to the center of the film layer 22 is 30 mm; the side length of the swing arm 23 is 40 mm, the width is 2 mm, and the thickness is 2 mm. In the specific design, the sound insulation performance of the swing-arm unit cell can be optimized by adjusting the various parameters of the above-mentioned swing-arm unit cell dimensions.

[0043] By setting the frame 21 as a grid frame and providing a mass block 23 and a swing arm 24 in each unit cell, multiple swing arm type units can be used to achieve sound insulation at different positions, further improving the sound absorption and noise reduction effect of the front enclosure insulation pad 10.

[0044] Alternatively, if Figure 3 As shown, the cells are arranged in a matrix.

[0045] The cells are arranged in a matrix form, which facilitates the processing and manufacturing of the first sound absorbing layer 2 and helps to reduce the cost of the front wall insulation pad 10.

[0046] Alternatively, if Figure 4 As shown, the frame 21 , the mass block 23 and the swing arm 24 are arranged on the same side of the film layer 22 in the thickness direction.

[0047] For example, the film layer 22 includes a first surface and a second surface that are oppositely arranged, and the frame 21 , the mass block 23 and the swing arm 24 are all connected to the first surface.

[0048] By arranging the frame 21, the mass block 23 and the swing arm 24 on the same side of the thickness direction of the film layer 22, the frame 21, the mass block 23 and the swing arm 24 can occupy the same space, so that the thickness of the first sound absorbing layer 2 can be further thinned, and the space inside the vehicle occupied by the thin front enclosure thermal insulation pad 10 can be reduced, which is more conducive to the layout of the components inside the vehicle.

[0049] Of course, in other embodiments, the frame 21 and the mass block 23 may also be disposed on both sides of the film layer 22 in the thickness direction, respectively.

[0050] In some embodiments, Figure 1 As shown, the front wall insulation pad 10 also includes a second sound absorbing layer 3, which is a foaming layer. The second sound absorbing layer 3 is arranged on one side of the first sound absorbing layer 2 in the thickness direction and is connected to the first sound absorbing layer 2.

[0051] For example, the second sound absorbing layer 3 is a PU foam layer.

[0052] The acoustic metamaterial has good sound absorption ability for medium and low frequency noise, and the foaming layer has good sound absorption ability for medium and high frequency noise. By setting the front enclosure thermal insulation pad 10 to include a first sound absorption layer 2 using the acoustic metamaterial and a second sound absorption layer 3 using the foaming layer, the high front enclosure thermal insulation pad 10 can have good sound absorption ability for high, medium and low frequency noise, thereby further improving the sound absorption and noise reduction effect of the front enclosure thermal insulation pad 10.

[0053] Optionally, the second sound absorbing layer 3 is disposed between the first sound absorbing layer 2 and the sound insulating layer 1 , and is connected to the sound insulating layer 1 .

[0054] By arranging the second sound absorbing layer 3 between the first sound absorbing layer 2 and the sound insulation layer 1, the sound absorption and noise reduction effect of the front enclosure thermal insulation pad 10 is improved by adding the first sound absorbing layer 2 while retaining the structure of the front enclosure thermal insulation pad in the prior art, and the thickness of the second sound absorbing layer 3 is reduced.

[0055] Optionally, the second sound absorbing layer 3 is bonded to the sound insulating layer 1 .

[0056] The second sound absorbing layer 3 is bonded to the sound insulating layer 1. Compared with the second sound absorbing layer 3 being connected to the sound insulating layer 1 via a connecting piece, the overall structure of the dash thermal insulation pad 10 can be simplified, which is beneficial to further reduce the weight of the dash thermal insulation pad 10, thereby further reducing the weight of the vehicle having the dash thermal insulation pad 10.

[0057] Optionally, the sound insulation layer 1 is a honeycomb panel.

[0058] For example, the sound insulation layer 1 is made of EVA.

[0059] By setting the sound insulation layer 1 as a honeycomb panel, it is beneficial to improve the sound insulation ability of the sound insulation layer 1 and further improve the noise reduction effect of the front wall insulation pad 10.

[0060] It should be noted that if Figure 1 As shown, when the front heat insulation pad 10 includes a sound insulation layer 1, a first sound absorbing layer 2 and a second sound absorbing layer 3, the thickness of the second sound absorbing layer 3 (ie, the foaming layer) can be reduced; Figure 1 As shown, when the dash thermal insulation pad 10 only includes the sound insulation layer 1 and the first sound absorbing layer 2 but does not include the second sound absorbing layer 3, the first sound absorbing layer 2 replaces the foaming layer of the dash thermal insulation pad 10 in the prior art.

[0061] The vehicle of the embodiment of the utility model comprises the front wall heat insulation pad 10 described in any of the above embodiments. The vehicle can be a pure electric vehicle or a hybrid electric vehicle.

[0062] For example, the vehicle includes a body sheet metal, and the first sound absorbing layer 2 is connected to the body sheet metal. The first sound absorbing layer 2 and the body sheet metal can be bonded.

[0063] Since the front wall heat insulation pad 10 of the embodiment of the utility model is thin and light, the front wall heat insulation pad 10 will occupy less space in the vehicle, which is beneficial to the arrangement of components in the vehicle, and the vehicle body weight is lighter.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A front wall heat insulation pad, characterized in that: include: Sound insulation layer; The first sound absorbing layer is arranged on one side of the sound insulation layer in the thickness direction and connected to the sound insulation layer. The structure of the first sound absorbing layer is an acoustic metamaterial structure.

2. The front wall heat insulation pad according to claim 1, characterized in that: The first sound absorbing layer includes a frame, a film layer, a mass block and a swing arm. The frame is arranged on one side of the thickness direction of the film layer and is connected to the film layer. The frame forms a unit cell. The mass block and the swing arm are both arranged in the unit cell and are connected to the film layer.

3. The front wall insulation pad according to claim 2, characterized in that: The swing arm is in a cross shape, and the number of the mass blocks in each unit cell is eight, and the eight mass blocks are evenly arranged along the circumference of the swing arm.

4. The front wall heat insulation pad according to claim 3, characterized in that: The swing arm comprises eight supporting arms, which are arranged in a cross-shaped pattern, and the mass block and the supporting arms are arranged at intervals along the circumference of the swing arm.

5. The front wall heat insulation pad according to claim 2, characterized in that: The frame is a grid frame, and the grid frame is surrounded by a plurality of cells, and each cell is provided with the mass block and the swing arm.

6. The front wall heat insulation pad according to claim 5, characterized in that: The cells are arranged in a matrix.

7. The front wall heat insulation pad according to claim 2, characterized in that: The frame, the mass block and the swing arm are arranged on the same side in the thickness direction of the film layer.

8. The cowl insulation pad according to claim 1, characterized in that: The front wall heat insulation pad also includes a second sound absorbing layer, which is a foaming layer. The second sound absorbing layer is arranged on one side of the first sound absorbing layer in the thickness direction and is connected to the first sound absorbing layer.

9. The front wall heat insulation pad according to claim 8, characterized in that: The second sound absorbing layer is disposed between the sound insulating layer and the first sound absorbing layer, and is connected to the sound insulating layer; and / or The second sound absorbing layer is bonded to the first sound absorbing layer.

10. The cowl insulation pad according to any one of claims 1 to 9, characterized in that: The sound insulation layer is a honeycomb board.

11. A vehicle, characterized in that: The invention comprises the front wall heat insulation pad according to any one of claims 1 to 10.

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