CN-224211004-U - Multi-band directional sound insulation front wall pad

CN224211004UCN 224211004 UCN224211004 UCN 224211004UCN-224211004-U

Abstract

The utility model discloses a multi-band directional sound insulation front surrounding pad, which relates to the technical field of automobile appliances and comprises an outer noise reduction layer, a broadband sound insulation layer, a sound absorption resonance layer and an adhesive layer, wherein the adhesive layer is fixedly connected to the top surface of the outer noise reduction layer, the broadband sound insulation layer is fixedly connected to the bottom surface of the outer noise reduction layer, the sound absorption resonance layer is fixedly connected to the bottom surface of the broadband sound insulation layer, the broadband sound insulation layer comprises damping glue and an aluminum alloy plate, the aluminum alloy plate is provided with a double layer, the outer noise reduction layer is used as a first layer contacting an engine cabin, the high elasticity and the flexibility of the outer noise reduction layer can absorb idle vibration of an engine, solid sound transmission is reduced, the fit critical frequency of the aluminum plate is destroyed through the corrugated surface of the double-layer corrugated aluminum alloy plate, the middle-high band sound insulation low valley is avoided, the damping glue fills gaps among the aluminum plate to inhibit the vibration of the aluminum plate, the secondary noise radiation caused by the vibration is reduced, and the integral sound insulation performance is improved.

Inventors

XIE JIANYU
Fu Benteng
XIE XIAORONG
WANG BINGJUN
HU XIMEI

Assignees

江苏赛露达汽车隔音材料有限公司

Dates

Publication Date: 20260508
Application Date: 20250617

Claims (5)

1. The multi-band directional sound insulation front wall pad is characterized by comprising an outer noise reduction layer (1), a broadband sound insulation layer (2), a sound absorption resonance layer (3) and an adhesive layer (4), wherein the adhesive layer (4) is fixedly connected to the top surface of the outer noise reduction layer (1), the broadband sound insulation layer (2) is fixedly connected to the bottom surface of the outer noise reduction layer (1), the sound absorption resonance layer (3) is fixedly connected to the bottom surface of the broadband sound insulation layer (2), the broadband sound insulation layer (2) comprises damping glue (21) and an aluminum alloy plate (22), the aluminum alloy plate (22) is provided with double layers, the surfaces of the aluminum alloy plate (22) are alternately stacked and connected with the damping glue (21), and sealing rubber strips (5) are fixedly connected to the outer edges of the outer noise reduction layer (1), the broadband sound insulation layer (2) and the sound absorption resonance layer (3).
2. The multi-band directional sound insulation front wall pad of claim 1, wherein the outer noise reduction layer (1) comprises a rubber pad (11), a honeycomb damping sheet (12) and a polyester fiber layer (13), the rubber pad (11) is fixedly connected to the top surface of the honeycomb damping sheet (12), and the bottom surface of the adhesive layer (4) is fixedly connected to the top surface of the rubber pad (11).
3. The multi-band directional sound insulation front wall pad according to claim 2, wherein the polyester fiber layer (13) is fixedly connected to the bottom surface of the honeycomb damping sheet (12).
4. The multi-band directional sound insulation front wall pad of claim 1, wherein the sound absorption resonance layer (3) comprises a sound absorption foam layer (31), a threading hole (32), a sealing sleeve (33), an elastic film (34) and a cavity (35), the threading hole (32) is penetrated and arranged in the sound absorption foam layer (31), and the sealing sleeve (33) is fixedly connected to the inner wall of the threading hole (32).
5. A multi-band directional sound insulation front wall pad according to claim 4, wherein the elastic film (34) is fixedly connected to the bottom surface of the sound absorption foam layer (31), and the cavity (35) is arranged inside the sound absorption foam layer (31).

Description

Multi-band directional sound insulation front wall pad Technical Field The utility model relates to the technical field of automobile appliances, in particular to a multi-band directional sound insulation front wall pad. Background The automobile front wall pad is a key sound insulation component arranged between the cockpit and the engine cabin, is mainly used for blocking transmission of engine vibration noise, mechanical noise and airflow noise to the cockpit, and along with improvement of driving comfort requirements of consumers and prominent acoustic challenges of new energy automobiles due to high-frequency noise of a motor, the traditional single-function sound insulation material is difficult to meet the sound insulation requirements of wide frequency band, orientation and light weight. However, in the prior art, the traditional sound-insulation front wall pad is made of porous sound-absorbing materials, so that the treatment of the middle and high frequency noise is single, the effective treatment cannot be carried out under the influence of the noise in different frequency bands, and when the areas such as wire harness perforation and the like are not specially treated, the traditional sound-insulation front wall pad is easy to become a main leakage channel of the high frequency noise, and the sound-insulation effect of the front wall pad is influenced. Disclosure of utility model The utility model aims to solve the problems that the traditional sound-insulation front wall pad is made of porous sound-absorbing materials, the treatment of middle-high frequency noise is single, the sound-insulation front wall pad cannot adapt to the noise influence of different frequency bands to effectively treat, and when areas such as wire harness perforation and the like are not specially treated, the areas are easy to become main leakage channels of the high frequency noise, and the sound-insulation effect of the front wall pad is affected. In order to achieve the above purpose, the multi-band directional sound insulation front wall pad comprises an outer noise reduction layer, a broadband sound insulation layer, a sound absorption resonance layer and an adhesive layer, wherein the adhesive layer is fixedly connected to the top surface of the outer noise reduction layer, the broadband sound insulation layer is fixedly connected to the bottom surface of the outer noise reduction layer, the sound absorption resonance layer is fixedly connected to the bottom surface of the broadband sound insulation layer, the broadband sound insulation layer comprises damping glue and an aluminum alloy plate, the aluminum alloy plate is provided with two layers, the surfaces of the aluminum alloy plate are alternately stacked and connected with the damping glue in a corrugated mode, and sealing rubber strips are fixedly connected to the outer edges of the outer noise reduction layer, the broadband sound insulation layer and the sound absorption resonance layer. Preferably, the outer noise reduction layer comprises a rubber pad, a honeycomb damping sheet and a polyester fiber layer, wherein the rubber pad is fixedly connected to the top surface of the honeycomb damping sheet, and the bottom surface of the sticky layer is fixedly connected with the top surface of the rubber pad. Preferably, the polyester fiber layer is fixedly connected to the bottom surface of the honeycomb damping sheet. Preferably, the sound-absorbing resonance layer comprises a sound-absorbing foam layer, a threading hole, a sealing sleeve, an elastic film and a cavity, wherein the threading hole is penetrated and arranged in the sound-absorbing foam layer, and the sealing sleeve is fixedly connected with the inner wall of the threading hole. Preferably, the elastic film is fixedly connected to the bottom surface of the sound-absorbing foam layer, the cavity is arranged in the sound-absorbing foam layer, and the cavity is provided with a plurality of different sizes. Compared with the prior art, the utility model has the advantages and positive effects that: 1. According to the utility model, the outer noise reduction layer is used as the first layer contacting the engine cabin, the high elasticity and flexibility of the outer noise reduction layer can absorb the idle vibration of the engine, the solid sound transmission is reduced, the fit critical frequency of the aluminum plate is destroyed through the corrugated surface of the double-layer corrugated aluminum alloy plate, the middle-high frequency band sound insulation valley is avoided, the damping glue fills the gaps among the aluminum plates, the vibration of the aluminum plates is restrained, the secondary noise radiation generated by the vibration is reduced, and the overall sound insulation performance is improved. 2. According to the utility model, through the cooperation of the cavities with different sizes in the sound-absorbing foam layer and the elastic film, resonance absorption is carried out