Sound insulation and noise reduction engine hood for front engine

Abstract

The sound insulation and noise reduction engine cover for the front engine comprises a supporting frame, and a skin and a sound insulation structure are arranged on the two sides of the supporting frame respectively. The sound insulation structure is composed of an inner layer, a sound absorption layer and a reflecting layer, and the reflecting layer is made of a micropore ceramic aluminum plate and effectively reflects high-frequency noise; the sound absorption layer is made of a gradient pore aluminum foam material, and is embedded with a spiral glass fiber bundle, so that low and medium frequency sound energy can be consumed, and the sound absorption effect is further improved; in addition, the connecting mechanism on the inner layer achieves firm connection between the sound insulation structure and the supporting frame through the magnetic repulsive force principle, the problem that a traditional plastic buckle is aged and falls off is solved, and meanwhile the influence of vibration in the vehicle running process on the sound insulation structure is reduced. The sound insulation and noise reduction structure has remarkable sound insulation and noise reduction effects and good connection stability, and provides a more quiet and comfortable driving and riding environment for a driver and passengers.

Description

Technical Field

[0001] This utility model relates to the field of transportation vehicle technology, and in particular to a sound-insulating and noise-reducing engine hood for a front-mounted engine. Background Technology

[0002] In the automotive industry, engine noise control has always been a crucial issue. Traditional hood sound insulation structures often employ dense filling materials, such as sound-absorbing cotton and foam layers, in an attempt to reduce noise. However, while these materials can absorb and block noise to some extent, their thermal insulation properties also hinder the effective dissipation of heat from the engine compartment. This not only affects the engine's normal operating temperature but may also accelerate the aging of engine components and reduce their lifespan.

[0003] In addition, traditional sound insulation structures and engine hoods are mostly connected by plastic clips. During long-term vehicle use, due to frequent temperature changes in the engine compartment, the plastic clips are prone to aging and becoming brittle, causing the sound insulation structure to fall off and posing a threat to vehicle driving safety. Therefore, there is an urgent need for a new type of front-engine sound insulation and noise reduction engine hood to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a sound-insulating and noise-reducing engine hood for a front-mounted engine, thereby solving the problems mentioned in the background art.

[0005] To achieve the above-mentioned technical objectives, the present invention provides a sound-insulating and noise-reducing engine hood for a front-mounted engine, comprising a support frame, wherein a skin and a sound-insulating structure are respectively provided on both sides of the support frame, the sound-insulating structure comprising an inner layer, a sound-absorbing layer and a reflective layer, a connecting mechanism is provided on the inner layer, a connecting hole adapted to the connecting mechanism is provided on the support frame, the sound-absorbing layer is disposed between the inner layer and the reflective layer, a connecting bolt is provided on the inner layer, the connecting bolt passes through the sound-absorbing layer and connects to the reflective layer, the sound-absorbing layer is a gradient porous aluminum foam, and the reflective layer is a microporous ceramic aluminum plate.

[0006] Furthermore, the connecting mechanism includes an elastic sleeve and a connecting post fixedly disposed on the inner layer. The connecting post is disposed inside the elastic sleeve and has a telescopic hole along its radial direction. A telescopic mechanism is disposed inside the telescopic hole, and the elastic sleeve covers the telescopic hole in its natural state.

[0007] Furthermore, the telescopic mechanism includes a first locking tongue and a second locking tongue, with a matching telescopic column and telescopic tube respectively provided on their adjacent sides. Both the telescopic column and the telescopic tube are provided with axially oriented strip grooves. The top of the connecting column is provided with a positioning hole, and a positioning column is provided in the positioning hole. The upper part of the positioning column is threaded to the positioning hole, and the lower end passes through the strip groove. Both the first locking tongue and the second locking tongue are permanent magnets, and their adjacent end sections have the same polarity.

[0008] Furthermore, the porosity of the sound-absorbing layer increases from 40% to 75% from the outside to the inside, with a pore size of 0.8-2.0 mm, and is embedded with spiral glass fiber bundles.

[0009] Furthermore, the pore size of the reflective layer is 0.2-0.5 mm, and the porosity is 30%.

[0010] Compared with the prior art, the beneficial effects of this utility model include:

[0011] 1. This utility model uses a microporous ceramic aluminum plate as a reflective layer to effectively reflect high-frequency noise, significantly reducing the penetration and propagation of high-frequency noise and improving the sound insulation effect. At the same time, the sound-absorbing layer uses gradient porous aluminum foam material and embeds spiral glass fiber bundles. This design not only allows mid- and low-frequency sound waves to enter the gradient porous layer for multiple reflections and scattering, effectively consuming sound energy, but also causes the fiber bundles to generate friction and vibration under the action of sound waves, further consuming energy and reducing sound pressure, greatly improving the sound absorption effect.

[0012] 2. The connecting mechanism of this utility model adopts the principle of magnetic repulsion. By squeezing the sound insulation structure, the connecting column protrudes from the elastic sleeve. When the telescopic hole is aligned with the connecting hole on the support frame, the first and second locking tongues automatically pop out and lock under the action of magnetic repulsion, realizing a firm connection between the sound insulation structure and the support frame. This connection method not only avoids the problem of aging and falling off of traditional plastic buckles, but also the compressed elastic sleeve plays a buffering role, reducing the impact of vehicle vibration on the sound insulation structure and improving the stability and durability of the sound insulation structure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a front-engine sound-insulating and noise-reducing hood provided by this utility model;

[0014] Figure 2 This is a schematic diagram of the sound insulation structure of a front-engine sound insulation and noise reduction hood provided by this utility model;

[0015] Figure 3 This is a schematic diagram of the connection mechanism for a front-mounted engine sound insulation and noise reduction hood provided by this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] This utility model provides a sound-insulating and noise-reducing engine hood for a front-mounted engine, the structure of which is as follows: Figure 1 As shown, the structure includes a support frame 1, with a skin (not shown) and a sound insulation structure on both sides of the support frame 1. The sound insulation structure includes an inner layer 2, a sound-absorbing layer 3, and a reflective layer 4. The inner layer 2 is provided with a connecting mechanism 6 that connects to the support frame 1. The support frame 1 is provided with a connecting hole that mates with the inner layer 6. The inner layer 2 is also provided with a connecting bolt 5, which passes through the sound-absorbing layer 3 and connects to the reflective layer 4, ensuring the stability of the sound insulation structure.

[0018] Reference Figure 2 The reflective layer 4 is a microporous ceramic aluminum plate with a pore size of 0.2-0.5 mm and a porosity of 30%. High-frequency noise is reflected when it encounters the microporous ceramic layer, reducing the penetration of high-frequency noise and further improving the sound insulation effect. At the same time, the microporous ceramic aluminum plate has good heat resistance and corrosion resistance, and can maintain stable reflective performance over a long period of time.

[0019] The sound-absorbing layer 3 is located between the inner layer 2 and the reflective layer 4. It is a gradient porous aluminum foam with a porosity that increases from 40% to 75% from the outside to the inside, and a pore size of 0.8-2.0 mm. This design allows mid-to-low frequency sound waves to enter the gradient porous layer and undergo multiple reflections and scatterings with the pore walls as they propagate, thereby consuming sound energy. In addition, spiral glass fiber bundles are embedded inside the sound-absorbing layer 3. These fiber bundles will generate friction and vibration under the action of sound waves, further consuming energy, reducing sound pressure, and improving the sound absorption effect.

[0020] Reference Figure 3The connecting mechanism 6 includes an elastic sleeve 602 and a connecting post 601 fixedly disposed on the inner layer 2. The connecting post 601 is disposed inside the elastic sleeve 602, and the connecting post 601 is provided with a radial telescopic hole 603. A first locking tongue 605 and a second locking tongue 606 are provided in the telescopic hole 603. Adjacent sides of the two are respectively provided with a matching telescopic post 607 and a telescopic tube 608. Both the telescopic post 607 and the telescopic tube 608 are provided with an axial strip groove 609. The top of the connecting post 601 is provided with a positioning hole 604. A positioning post 610 is provided in the positioning hole 604. The upper part of the positioning post 610 is threadedly connected to the positioning hole 604, and the lower end passes through the strip groove 609. Both the first locking tongue 605 and the second locking tongue 606 are magnets, and the adjacent ends of the two have the same polarity. The elastic sleeve 602 covers the telescopic hole 603 in its natural state, thereby restricting the first locking tongue 605 and the second locking tongue 606 within the telescopic hole 603.

[0021] During installation, align the connecting mechanism 6 with the connecting hole on the support frame 1, and squeeze the sound insulation structure so that the connecting post 601 protrudes from the elastic sleeve 602. After the telescopic hole 603 passes through the connecting hole, the first locking tongue 605 and the second locking tongue 606 extend out of the telescopic hole 603 under the action of magnetic repulsion, thereby fixing the sound insulation structure to the support frame 1. Compared with the existing plastic buckles, the connecting mechanism 6 will not experience aging and falling off. At the same time, the compressed elastic sleeve 602 plays a buffering role, reducing the impact of vehicle vibration on the sound insulation structure during operation.

[0022] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A sound-insulating and noise-reducing hood for a front-mounted engine, comprising a support frame, wherein a skin and a sound-insulating structure are respectively provided on both sides of the support frame, characterized in that: The sound insulation structure includes an inner layer, a sound-absorbing layer, and a reflective layer. The inner layer is provided with a connecting mechanism, and the support frame is provided with a connecting hole adapted to the connecting mechanism. The sound-absorbing layer is disposed between the inner layer and the reflective layer. The inner layer is provided with a connecting bolt, which passes through the sound-absorbing layer and connects to the reflective layer. The sound-absorbing layer is a gradient porous aluminum foam, and the reflective layer is a microporous ceramic aluminum plate.

2. The sound-insulating and noise-reducing engine hood for a front-mounted engine according to claim 1, characterized in that: The connecting mechanism includes an elastic sleeve and a connecting post fixedly disposed on the inner layer. The connecting post is disposed inside the elastic sleeve and has a telescopic hole along its radial direction. A telescopic mechanism is disposed inside the telescopic hole, and the elastic sleeve covers the telescopic hole in its natural state.

3. A sound-insulating and noise-reducing engine hood for a front-mounted engine according to claim 2, characterized in that: The telescopic mechanism includes a first locking tongue and a second locking tongue, with a matching telescopic column and telescopic tube respectively provided on their adjacent sides. Both the telescopic column and the telescopic tube are provided with axially oriented strip grooves. The top of the connecting column is provided with a positioning hole, and a positioning column is provided in the positioning hole. The upper part of the positioning column is threaded to the positioning hole, and the lower end passes through the strip groove. Both the first locking tongue and the second locking tongue are permanent magnets, and their adjacent end sections have the same polarity.

4. A sound-insulating and noise-reducing engine hood for a front-mounted engine according to claim 2 or 3, characterized in that: The porosity of the sound-absorbing layer increases from 40% to 75% from the outside to the inside, with a pore size of 0.8-2.0 mm, and is embedded with spiral glass fiber bundles.

5. A sound-insulating and noise-reducing engine hood for a front-mounted engine according to claim 4, characterized in that: The reflective layer has a pore size of 0.2-0.5 mm and a porosity of 30%.

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