Front wall outer sound insulation pad and vehicle

Abstract

The utility model relates to a front wall outer sound insulation pad and a vehicle, the front wall outer sound insulation pad is composed of a separation layer, a needle-punched non-woven fabric layer, a sound absorption layer, a sound insulation layer and a non-woven fabric layer which are sequentially arranged from top to bottom, and the thickness ratio of the separation layer to the needle-punched non-woven fabric layer to the sound absorption layer to the sound insulation layer to the non-woven fabric layer is (0.5-2): (5-10): (250-300): (10-30): (5-10). Hot melt adhesive is arranged among the partition layer, the needle-punched non-woven fabric layer, the sound absorption layer, the sound insulation layer and the non-woven fabric layer, and the partition layer, the needle-punched non-woven fabric layer, the sound absorption layer, the sound insulation layer and the non-woven fabric Compared with the prior art, the sound insulation and heat insulation pad can solve the technical problems that in the prior art, a sound insulation layer of a sound insulation and heat insulation pad is thin in structure and poor in overall sound insulation effect.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile acoustic components, in particular to a front enclosure outer sound insulation pad and a vehicle. Background Art

[0002] Automotive interior components are typically installed inside a vehicle, providing insulation, sound insulation, and aesthetics. In an era where high performance, environmental friendliness, energy efficiency, lightweight design, and personalization are increasingly sought after, the interior, like the exterior, has become a crucial factor in vehicle purchase decisions. Consequently, the requirements for automotive interior components are becoming increasingly demanding.

[0003] In the existing technology, car sound insulation is getting more and more attention. Good sound insulation can bring people a better driving comfort.

[0004] To isolate the space between the cockpit and engine compartment, soundproof and heat-insulating insulation components are typically bonded to the vehicle's sheet metal (this area is called the dash panel). The dash's exterior sound insulation pad is typically constructed with lightweight PUR and non-woven fabric or aluminum foil. Lightweight PUR offers excellent sound absorption, heat insulation, and vibration isolation, while non-woven fabric provides excellent coverage and waterproofing, and aluminum foil offers excellent thermal conductivity and heat reflection.

[0005] However, because the noise inside the engine is very loud, even this structure cannot effectively soundproof, and the noise from the engine and air-conditioning compressor will still be transmitted to the cockpit; and the front auxiliary sound insulation pad is too large and easily torn during the molding process, affecting performance, and the installation process takes a long time. In addition, the front auxiliary sound insulation pad is not easy to stack, and it takes up a lot of space during transportation, resulting in increased transportation costs. It is also heavy and does not meet the requirements of lightweight improvement. Utility Model Content

[0006] The purpose of the utility model is to provide a front outer sound insulation pad and a vehicle, so as to solve the technical problems in the prior art that the sound insulation layer structure of the sound insulation pad is thin and the overall sound insulation effect is poor.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A front outer sound insulation pad is composed of a partition layer, a needle-punched non-woven fabric layer, a sound-absorbing layer, a sound-insulating layer and a non-woven fabric layer arranged in sequence from top to bottom.

[0009] The thickness ratio of the barrier layer, the needle-punched non-woven fabric layer, the sound-absorbing layer, the sound-insulating layer and the non-woven fabric layer is (0.5-2): (5-10): (250-300): (10-30): (5-10),

[0010] Hot melt adhesive is provided between the partition layer, the needle-punched non-woven fabric layer, the sound-absorbing layer, the sound-insulating layer and the non-woven fabric layer, and the layers are molded and bonded together by a hot press.

[0011] In one embodiment of the present invention, the barrier layer is aluminum foil, the perforation rate of the aluminum foil is 1% to 3%, and the thickness of the aluminum foil is 0.05 to 0.2 mm.

[0012] As a preferred technical solution, the perforation rate of the aluminum foil is 2.1%, and the thickness of the aluminum foil is 0.1 mm.

[0013] In one embodiment of the present invention, micropores are provided on the surface of the aluminum foil, and the pore diameter of the micropores is 0.5 mm to 0.7 mm.

[0014] As a preferred technical solution, the diameter of the micropores is 0.6 mm.

[0015] As a preferred technical solution, the aluminum foil is pressed into a tile-shaped shape in both the horizontal and vertical directions to form a concave-convex texture to improve its ductility.

[0016] In one embodiment of the present invention, the thickness of the sound absorbing layer is 25 to 30 mm.

[0017] As a preferred technical solution, the thickness of the sound-absorbing layer is 28 mm.

[0018] In one embodiment of the present invention, the sound absorbing layer is a lightweight polyurethane (PUR) having a density of 10 to 25 kg / m 3 .

[0019] As a preferred technical solution, the density of the lightweight polyurethane is 17kg / m 3 .

[0020] In one embodiment of the present invention, micropores are provided on the surface of the lightweight polyurethane, and the pore diameter of the micropores is 0.1 mm to 0.3 mm.

[0021] As a preferred technical solution, the diameter of the micropores is 0.15 mm.

[0022] In one embodiment of the present invention, the thickness of the sound insulation layer is 1 to 3 mm.

[0023] As a preferred technical solution, the thickness of the sound insulation layer is 2 mm.

[0024] In one embodiment of the present invention, the sound insulation layer is ethylene propylene diene monomer (EPDM) rubber, and the density of the EPDM rubber is 1-2 g / cm 3 .

[0025] As a preferred technical solution, the density of the EPDM rubber is 1.8 g / cm 3 .

[0026] In one embodiment of the present invention, the thickness of the needle-punched non-woven fabric layer is 0.5 to 1.0 mm, and the thickness of the non-woven fabric layer is 0.5 to 1.0 mm.

[0027] As a preferred technical solution, the thickness of the needle-punched non-woven fabric layer is 0.8 mm, and the thickness of the non-woven fabric layer is 0.8 mm.

[0028] As a preferred technical solution, the hot melt adhesive includes PE adhesive film and PE adhesive powder.

[0029] In addition, the utility model also provides a vehicle, including the above-mentioned front outer sound insulation pad.

[0030] The sound insulation principle of this utility model is as follows:

[0031] The sound and heat generated by the engine and air-conditioning compressor when starting are transferred to the aluminum foil (insulation layer), part of which is reflected and part enters the lightweight PUR (sound-absorbing layer); after entering the porous structure of the lightweight PUR, further sound absorption is carried out; finally, the EPDM surface (sound-insulating layer) blocks the remaining part of the sound, further reducing sound transmission.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The utility model adds EPDM rubber to the front outer sound insulation pad. The material is a terpolymer of ethylene, propylene and non-conjugated diene. This material has a very good sound absorption effect, plays the purpose of isolating noise, and meets the current people's demand for quietness;

[0034] 2. The aluminum foil in the present invention adopts a micro-puncture design, and the aluminum foil is pressed into a tile-shaped shape in both the horizontal and vertical directions to form a concave and convex texture to improve ductility;

[0035] 3. The utility model adds an EPDM elastic surface to the front outer sound insulation pad to enhance the sound insulation pad effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is an exploded view of the structure of the outer sound insulation pad of the front panel of the utility model;

[0037] Explanation of the accompanying figures: 1. Partition layer, 2. Needle-punched non-woven fabric layer, 3. Sound-absorbing layer, 4. Sound-insulating layer, 5. Non-woven fabric layer. DETAILED DESCRIPTION

[0038] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0042] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0043] Example 1

[0044] See also Figure 1 This embodiment provides a front outer sound insulation pad, which is composed of a partition layer 1, a needle-punched non-woven fabric layer 2, a sound-absorbing layer 3, a sound-insulating layer 4 and a non-woven fabric layer 5 arranged in order from top to bottom.

[0045] The thickness ratio of the barrier layer 1, the needle-punched non-woven fabric layer 2, the sound-absorbing layer 3, the sound-insulating layer 4 and the non-woven fabric layer 5 is (0.5-2): (5-10): (250-300): (10-30): (5-10),

[0046] Hot melt adhesive is provided between the partition layer 1, the needle-punched non-woven fabric layer 2, the sound-absorbing layer 3, the sound-insulating layer 4 and the non-woven fabric layer 5, and the layers are molded together by a hot press.

[0047] In this embodiment, the isolation layer 1 is aluminum foil, the perforation rate of the aluminum foil is 2.1%, and the thickness of the aluminum foil is 0.1 mm.

[0048] In this embodiment, micropores are provided on the surface of the aluminum foil, and the diameter of the micropores is 0.6 mm.

[0049] In this embodiment, the aluminum foil is pressed into a tile-shaped shape in both the horizontal and vertical directions to form a concave-convex texture to improve its ductility.

[0050] In this embodiment, the thickness of the sound absorbing layer 3 is 28 mm.

[0051] In this embodiment, the sound absorbing layer 3 is made of lightweight polyurethane (PUR), and the density of the lightweight polyurethane is 17 kg / m 3 .

[0052] In this embodiment, micropores are provided on the surface of the lightweight polyurethane, and the diameter of the micropores is 0.15 mm.

[0053] In this embodiment, the thickness of the sound insulation layer 4 is 2 mm.

[0054] In this embodiment, the sound insulation layer 4 is made of ethylene propylene diene monomer (EPDM) rubber, and the density of the EPDM rubber is 1.8 g / cm 3 .

[0055] In this embodiment, the thickness of the needle-punched non-woven fabric layer 2 is 0.8 mm, and the thickness of the non-woven fabric layer 5 is 0.8 mm.

[0056] In this embodiment, the hot melt adhesive includes PE adhesive film and PE adhesive powder.

[0057] In addition, this embodiment provides a molding process for the aluminum foil in the front outer sound insulation pad, and the manufacturing method is as follows:

[0058] Base material aluminum foil → cutting and shearing → punching holes → aluminum foil pre-forming → baking → hot pressing → making into microporous aluminum foil for use.

[0059] Performance Testing

[0060] Taking the front outer sound insulation pad provided in this embodiment as an example, the customer has NVH acoustic requirements for the front outer sound insulation pad. According to the sound insulation coefficient requirements of GMW14176-2009, this embodiment arranges the test in the order of reverberation chamber → front outer sound insulation pad → anechoic chamber, uses an audio power amplifier to generate sound in the reverberation chamber, and finally uses a vibration acoustic analysis system to analyze the sound insulation coefficient as shown in Table 1.

[0061] Table 1 Sound insulation test results of the front outer sound insulation pad

[0062]

[0063] From the data in Table 1, it can be analyzed that the front outer sound insulation pad provided by this embodiment can not only meet the customer's requirements, but also far exceed the customer's acoustic requirements.

[0064] Example 2

[0065] This embodiment provides a vehicle, including the front outer sound insulation pad as described in Example 1.

[0066] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A front outer sound insulation pad, characterized in that: It is composed of a partition layer (1), a needle-punched non-woven fabric layer (2), a sound-absorbing layer (3), a sound-insulating layer (4) and a non-woven fabric layer (5) which are arranged in order from top to bottom. The thickness ratio of the barrier layer (1), the needle-punched non-woven fabric layer (2), the sound-absorbing layer (3), the sound-insulating layer (4) and the non-woven fabric layer (5) is (0.5-2): (5-10): (250-300): (10-30): (5-10), Hot melt adhesive is provided between the barrier layer (1), the needle-punched non-woven fabric layer (2), the sound-absorbing layer (3), the sound-insulating layer (4) and the non-woven fabric layer (5), and the layers are molded together by a hot press.

2. The front outer sound insulation pad according to claim 1, characterized in that: The barrier layer (1) is aluminum foil, the perforation rate of the aluminum foil is 1% to 3%, and the thickness of the aluminum foil is 0.05 to 0.2 mm.

3. The front outer sound insulation pad according to claim 2, characterized in that: Micropores are provided on the surface of the aluminum foil, and the pore diameter of the micropores is 0.5 mm to 0.7 mm.

4. The front outer sound insulation pad according to claim 1, characterized in that: The thickness of the sound absorbing layer (3) is 25 to 30 mm.

5. The front outer sound insulation pad according to claim 1, characterized in that: The sound absorbing layer (3) is a lightweight polyurethane, and the density of the lightweight polyurethane is 10-25 kg / m 3 .

6. The front outer sound insulation pad according to claim 5, characterized in that: The surface of the lightweight polyurethane is provided with micropores, and the pore diameter of the micropores is 0.1mm to 0.3mm.

7. The front outer sound insulation pad according to claim 1, characterized in that: The thickness of the sound insulation layer (4) is 1 to 3 mm.

8. The front outer sound insulation pad according to claim 1, characterized in that: The sound insulation layer (4) is EPDM rubber, and the density of the EPDM rubber is 1-2 g / cm 3 .

9. The front outer sound insulation pad according to claim 1, characterized in that: The thickness of the needle-punched non-woven fabric layer (2) is 0.5 to 1.0 mm, and the thickness of the non-woven fabric layer (5) is 0.5 to 1.0 mm.

10. A vehicle, characterized in that: It comprises the front outer sound insulation pad as described in any one of claims 1-9.

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