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CN-122009045-A - Sound insulation and noise reduction structure of automobile roof

CN122009045ACN 122009045 ACN122009045 ACN 122009045ACN-122009045-A

Abstract

The invention discloses a sound insulation and noise reduction structure of an automobile roof, which comprises a roof main body, wherein the roof main body is sequentially provided with a roof outer plate, an active noise reduction layer, a multi-frequency band sound absorption layer, a partition cavity layer and an inner decoration attachment layer from top to bottom. According to the invention, through the gradient density design of the multi-band sound absorption layer and the targeted optimization of the Helmholtz resonant cavity plate and the targeted expansion and retraction of the adjustable turbulence wing, different scenes such as high-speed commute, urban congestion, rainy and snowy weather and the like can be adapted when the automobile runs, and the driving silence is improved.

Inventors

  • WANG ZHENKAI

Assignees

  • 迈莎锐汽车(浙江)有限公司

Dates

Publication Date
20260512
Application Date
20260228

Claims (9)

  1. 1. A sound insulation and noise reduction structure of an automobile roof comprises an automobile roof main body (1) and is characterized in that the automobile roof main body (1) is sequentially provided with an automobile roof outer plate (2), an active noise reduction layer (3), a multi-frequency-band sound absorption layer (4), a partition cavity layer (5) and an interior decoration attaching layer (6) from top to bottom, one end of the outer side of the automobile roof outer plate (2) is provided with an adjustable turbulence wing (205), the top end of the adjustable turbulence wing (205) is equidistantly provided with a plurality of vortex generators (202), embedded piezoelectric films (301) and micro-speakers (302) are alternately arranged in the active noise reduction layer (3), the multi-frequency-band sound absorption layer (4) is in gradient arrangement, the multi-frequency-band sound absorption layer (4) is respectively provided with a high-density polyurethane layer (401), an open-cell foam layer (402) and a Helmholtz resonator plate (403), the partition cavity layer (5) is internally divided into three partitions, the partition cavity layer (5) comprises a front air bag group (501), an air bag group (502) and a rear air bag group (503), the front air bag group (502) is provided with a micro-air pump (505), and an output air pump (505) is arranged on one side of the micro-air pump (505) The middle-area air bag group (502) and the rear-area air bag group (503) are provided with branch pipes (506), the connection of each branch pipe (506) and each air bag is provided with an intelligent pressure regulating valve (508), and the interior decoration attaching layer (6) is formed by environment-friendly superfine fiber fabrics.
  2. 2. The sound insulation and noise reduction structure of an automobile roof according to claim 1, wherein the automobile roof main body (1) is provided with a placing groove (206) at the position of the adjustable turbulence wing (205), sealing strips (208) are arranged at the bottom and the side surfaces of the placing groove (206), a rotating rod (204) is arranged at the joint of one side of the adjustable turbulence wing (205) and the placing groove (206), one end of the rotating rod (204) is provided with a driving motor (203), and the driving motor (203) is positioned inside the automobile roof outer plate (2).
  3. 3. The sound insulation and noise reduction structure of an automobile roof according to claim 2, wherein a reduction gear set (207) is arranged between an output shaft of the driving motor (203) and the rotating rod (204), and the reduction ratio of the reduction gear set (207) is 10:1 to 20:1.
  4. 4. The sound insulation and noise reduction structure of an automobile roof according to claim 1, wherein the front region air bag set (501) is arranged on one side of the roof main body (1) close to the adjustable turbulence wing (205), and the unfolding angle of the adjustable turbulence wing (205) faces to the rear region air bag set (503).
  5. 5. The sound insulation and noise reduction structure of an automobile roof according to claim 4, wherein the number of air bags of the front area air bag group (501) is 8, the number of air bags of the middle area air bag group (502) is 12, the number of air bags of the rear area air bag group (503) is 4, and exhaust pipes (507) are arranged on two sides, close to the roof main body (1), of the front area air bag group (501), the middle area air bag group (502) and the rear area air bag group (503).
  6. 6. The sound insulation and noise reduction structure of an automobile roof according to claim 1, wherein the outer surface of the outer roof plate (2) is provided with a microporous sound absorption coating (201).
  7. 7. A sound-insulating and noise-reducing structure of an automobile roof according to claim 1, wherein the Helmholtz resonator plate (403) is formed of a plurality of regularly arranged resonator units (4031), and each of the resonator units (4031) includes a cylindrical cavity (4032) and a neck pipe (4033) communicating with the cavity.
  8. 8. A sound-insulating and noise-reducing structure for an automotive roof according to claim 1, characterized in that said open-cell foam layer (402) is made of melamine-formaldehyde foam having a gradient density, which is reduced from 80kg/m3 to 15kg/m3 in a gradient from top to bottom.
  9. 9. The sound insulation and noise reduction structure of an automobile roof according to claim 8, wherein the density of the high-density polyurethane layer (401) is 60-80kg/m3.

Description

Sound insulation and noise reduction structure of automobile roof Technical Field The invention relates to the technical field of sound insulation and noise reduction of automobile roofs, in particular to a sound insulation and noise reduction structure of an automobile roof. Background With the development of the automotive industry, vehicle comfort has become an important concern for users. The automobile roof is used as a main interior part of the upper part of the vehicle, and the sound insulation and noise reduction performance directly influences the riding experience. The traditional automobile roof adopts single-layer or multi-layer sound absorbing materials to carry out passive sound insulation, but has limited effect of suppressing low-frequency noise and wind noise. Through searching, chinese patent No. CN115626122a discloses a sound insulation and noise reduction structure of an automobile roof, when the inside of an air flow channel is in a negative pressure state, the top of an elastic steady piece expands to drive the elastic steady piece and a sponge layer plate connected with the elastic steady piece to rise, the inner decorative tarpaulin and the sponge layer plate are pulled to be clung to a partition plate to reduce vibration of the roof, and when a vehicle runs, an electric gate valve can be opened to flow air in the vehicle through the air flow channel, the flow of air is utilized to disturb the transmission of sound, noise of the vehicle from the top is further reduced, and the sound insulation and noise reduction effect is achieved. However, the above-mentioned patent product relies on air channel negative pressure drive inflation, and the negative pressure is not enough when driving at a low speed, leads to elasticity steady firmware unable in time to tighten interior trim tarpaulin, and vibration noise reduction effect is unstable, and traditional structural material exists not enough in the aspect of thermal-insulated, fire-retardant, lightweight and environmental protection recoverability, is difficult to satisfy the double demand of modern car to driving travelling comfort and green development. Therefore, the invention provides a multi-dimensional cooperative and intelligent response sound insulation and noise reduction structure for an automobile roof, which solves the technical problems. Disclosure of Invention The invention aims to solve the problems and provide a sound insulation and noise reduction structure of an automobile roof. The invention discloses a sound insulation and noise reduction structure of an automobile roof, which comprises an automobile roof main body, wherein the automobile roof main body is sequentially provided with an automobile roof outer plate, an active noise reduction layer, a multi-frequency band sound absorption layer, a partition cavity layer and an interior trim attaching layer from top to bottom, one end of the outer side of the automobile roof outer plate is provided with an adjustable turbulence wing, the top ends of the adjustable turbulence wings are equidistantly provided with a plurality of vortex generators, embedded piezoelectric films and micro-speakers are equidistantly and alternately arranged in the active noise reduction layer, the multi-frequency band sound absorption layer is in gradient arrangement, the multi-frequency band sound absorption layer is respectively provided with a high-density polyurethane layer, an open-pore foam layer and a Helmholtz resonance cavity plate from top to bottom, the partition cavity layer is divided into three partitions, the partition cavity layer comprises a front air bag group, a middle air bag group and a rear air bag group, a miniature air pump is arranged in the middle of one side of the front air bag group, the miniature air pump output end is provided with a main air pump, the main air pump is connected with the front air bag group, the branch air bag group and the rear air bag group is provided with a branch air bag group, the position of the branch air bag group is provided with an intelligent air-conditioning fabric attaching layer, and the intelligent air-conditioning fabric is formed by connecting each partition air conditioning fabric layer. Preferably, the roof canopy main part is located adjustable vortex wing position department is equipped with the standing groove, standing groove bottom and side all are equipped with the sealing strip, adjustable vortex wing one side with the standing groove junction is equipped with the bull stick, bull stick one end is equipped with driving motor, driving motor is located inside the roof planking. Preferably, a reduction gear set is arranged between the output shaft of the driving motor and the rotating rod, and the reduction ratio of the reduction gear set is 10:1 to 20:1. Preferably, the front region air bag set is arranged on one side of the roof main body close to the adjustable spoiler, and the unfolding angle of the adjustable spoiler fa