JPH0565698U - Molded soundproofing material for automobiles - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to reduce the engine noise outside or inside the vehicle by installing it on the engine undercover, dash outer, etc. of the vehicle. [Structure] Molded soundproofing for automobiles in which a mesh-like material 2 is integrated by providing a distance on the back surface side of a soundproof material base material 1 having an overhang portion 3 and the sound absorbing material 4 is filled on the back surface side of the overhang portion. Material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a molded sound insulation material for automobiles, which is mounted on a portion of a vehicle where sound absorption performance is required, and is particularly mounted in the engine room to satisfy the noise outside the vehicle and the noise inside the vehicle caused by the engine noise. The present invention relates to a molded soundproof material for automobiles.

[0002]

[Prior Art]

 Conventionally, for example, as a soundproof material for an automobile engine room, a soundproof material in which a fibrous or foam base material and a water-repellent and oil-repellent skin are integrally molded has been proposed.

Although such a molded soundproof material has some sound absorbing effect, there is an increasing need for noise reduction outside and inside the vehicle, and further improvement in sound absorbing performance has been demanded. In addition, it also has a sound absorption function that applies the film vibration of the soundproofing material base material, and there has been no idea in the past to obtain excellent sound absorption performance especially in the automobile engine room.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to realize a soundproof material which is light in weight, has strength superior to that of conventional products, and is further excellent in sound absorbing performance.

[0005]

[Means for Solving the Problems]

 As a solution to this problem, the inventors of the present invention have as a result of earnest research and found that the above problem can be solved by using a soundproof material base material having an overhang portion and capable of vibrating a membrane, and combining it with a mesh-like material. However, the gist of the present invention lies below.

A molded soundproof material for automobiles, characterized in that the mesh material 2 is integrated by providing a distance on the back surface side of the soundproof material base material 1 having the overhang portion 3.

The soundproof material substrate 1 having the overhanging portion 3 is provided with a distance on the back surface side to integrate the mesh-like material 2, and the back surface side of the overhanging portion is filled with the sound absorbing material 4. Molded soundproof material for automobiles.

The soundproofing material base material 1 is preferably a thin leaf-shaped base material, and is a thin foam material or film made of polyurethane, polyethylene, polypropylene, polyvinyl chloride, polycarbonate, etc., or felt, nonwoven fabric, glass wool. It is possible to use thin fibrous materials such as. Specifically, it is preferable to use one having a thickness of about 1 to 5 mm and a weight of about 50 to 300 g per 1 m ² . If it is less than 1 mm or less than 50 g, the soundproofing performance may be inferior, and if it exceeds 5 mm or 300 g, the weight may increase.

In the soundproof material base material 1, it is indispensable to provide the overhanging portion 3 at the time of molding, and the overhanging portion increases the surface area of the molded soundproofing material and improves the sound absorbing performance. The distance between two adjacent overhanging parts and the height of the overhanging part should be changed appropriately according to the material and weight of the base material used, and the distance between the overhanging parts should be between 5 and 200 mm for the best soundproofing effect. It is preferable to set so that If it is less than 5 mm, the sound absorption property in the low frequency range may be poor, and if it exceeds 200 mm, the sound absorption property in the high frequency range may be poor. The height of the overhanging portion is preferably 1 mm or more, and it is important to have the overhanging portion in order to improve the soundproof effect including the sound absorbing property.

The present invention is one in which a mesh 2 is integrally formed on the back surface side of a soundproof material base 1, and the mesh 2 is mainly intended to reinforce the soundproof material base 1. Therefore, it is preferable to use a plastic net or a wire net.

It is preferable that the back surface of the overhanging portion is filled with a sound absorbing material 4 in order to further improve the sound absorbing effect. Foam materials such as vinyl chloride and polycarbonate can be used.

The soundproofing material according to the present invention is preferably mounted and used in an engine room when it is mounted on an automobile, and may be mounted on a ceiling portion where sound absorption performance is required.

As a method of manufacturing the soundproofing material according to the present invention, for example, after molding a fiber base material, a plastic net formed on the back surface of the base material is formed such that the height of the overhanging portion is lower than that of the fiber base material. Can be obtained by laminating and press-bonding, or by pouring a foam material stock solution into a foaming mold to foam it, and then press-bonding a net similarly shaped with a low overhang.

In particular, when the dash outer or the engine under cover is mounted as a sound absorbing material for the engine room, it is preferable to apply water repellency or oil repellency treatment to the surface of the sound proof material.

[0015]

[Brief description of drawings]

FIG. 1 is a sectional view of a soundproof material according to the present invention.

FIG. 2 is a sectional view of a soundproofing material according to the present invention.

[Explanation of symbols]

 1 soundproof material base material 2 mesh material 3 overhanging portion 4 sound absorbing material

Claims (2)

[Scope of utility model registration request] 1. A molded soundproof material for automobiles, characterized in that the mesh material 2 is integrated by providing a distance on the back surface side of the soundproof material base material 1 having the overhang portion 3. 2. A soundproof material substrate 1 having an overhang portion 3 is provided with a distance on the back surface side to integrate the mesh-like material 2, and the back surface side of the overhang portion is filled with a sound absorbing material 4. A characteristic soundproofing material for automobiles.