JP2006240408A - Light/sound-absorbing under-cover for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop/provide an under-cover for an automobile, making sound-absorbing performance having large sound-absorbing effect and surface water repellency compatible, and using base material having expansibility and high strength. <P>SOLUTION: Reinforcing material such as glass fibers capable of corresponding to a plate thickness of 1.0 to 10.0 mm and olefin resin are mixed. The reinforcing fibers such as the reinforcing fibers are expanded to decrease weight and improve stiffness at a low specific gravity of 0.05 to 0.85. A reinforcing layer such as the olefin resin is provided and integrally formed on one surface or both surfaces of a core material adding sound-absorbing performance, thereby having excellent sound-isolating performance, sound-absorbing performance, and heat insulating performance. And both surfaces have water repellency. A porous sound-absorbing structure is materialized. Thickness can be adjusted, the sound-absorbing performance in a frequency zone requiring aim can be designed to be peak. An attaching portion and the like can be adjusted to have suitable plate thickness so as to increase attaching strength. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lightweight and sound-absorbing undercover for automobiles.

  Originally, the purpose of attaching the under cover is to improve the aerodynamic performance and to improve the handling characteristics, thereby improving the maximum speed and acceleration, and further improving the fuel efficiency and removing dust, sand, stone, mud, etc. This is to protect the surrounding area.

However, recently, as part of measures against pollution such as vibration and noise, the sound insulation effect of the under floor is large, and a method of setting a sound insulation layer on the middle layer and a sound absorption layer on both sides or one side has been taken. The sound-absorbing material has problems with sound absorption measures and attachment strength due to water, mud, etc., and tends to increase costs. And as an intermediate layer material for the under floor, PP is mainly used. However, as the under floor having a plate thickness of 2.0 mm (2000 g / m ² ) and a large area, an increase in weight is a big problem.

  Therefore, in addition to the above-mentioned object (0002), it is desired that the undercover from now on use a base material that has both sound absorption performance and surface water repellency, is expandable and has excellent strength.

In addition, the automobile undercover that has been filed so far is introduced. (See Patent Documents 1 to 3.)
JP-A-9-258740 JP2002-348767 JP2004-169616

  Therefore, in order to solve the above-mentioned problems, the present invention has developed and developed an undercover for automobiles that uses a base material that has both sound absorption performance and surface water repellency, which have a large soundproofing effect, and has excellent expandability and strength. It is to provide.

  As a means for solving this problem, the undercover is provided by mixing a reinforcing material such as glass fiber and an olefin-based resin that can handle a plate thickness of 1.0 mm to 10.0 mm, and a reinforcing fiber such as glass fiber is provided. Expanded, a specific gravity of 0.05 to 0.85 and a low specific gravity to improve weight and rigidity, and add a sound absorbing performance, and a reinforcing layer such as olefin resin is provided on one or both sides of the core It is a sound absorption structure with excellent sound insulation, sound absorption, and heat insulation, water repellency on both sides, and a porous sound absorption structure. The sound absorption performance in the necessary frequency band can be designed to the peak, and the mounting portion and the like can be adjusted to the optimum plate thickness in order to increase the mounting strength.

  As an effect of the present invention, the under cover is provided by mixing a reinforcing material such as glass fiber and an olefin resin that can handle a plate thickness of 1.0 mm to 10.0 mm, and expanding the reinforcing fiber such as glass fiber, A specific gravity of 0.05 to 0.85, low specific gravity, light weight and rigidity, and a core material that adds sound absorption performance, and a reinforcing layer such as an olefin-based resin are provided on one or both sides of the core material. This is an excellent sound insulation, sound absorption, and heat insulation, water repellency on both sides, and a porous sound absorption structure that can be adjusted in thickness and has a desired frequency. It can be designed with peak sound absorption performance in the band, and the mounting part can be adjusted to the optimum plate thickness to increase the mounting strength, so it is about 30% compared to conventional PP base materials. -50% weight reduction is possible, terminal Such excellent strength of the attachment sites, is intended to achieve the Naru extremely beneficial effect.

  As the best mode of the present invention, it is important to improve productivity and reduce costs by unifying (standardizing) the plate thickness and shape as much as possible within the allowable ranges of quality, strength and performance.

  Accordingly, an embodiment of the present invention will be described in detail with reference to FIG. 1. An under cover that covers the entire lower surface of a vehicle floor, the under cover being capable of handling plate thicknesses of 1.0 mm to 10.0 mm. Reinforcement material (2a) such as glass fiber and olefin resin (2b) are mixed and provided, and the reinforcement fiber such as glass fiber is expanded to increase the weight and rigidity at a low specific gravity of 0.05 to 0.85. In addition, the core material (2) to which sound absorbing performance is added and the reinforcing layer (1) such as an olefin resin are provided on one side or both sides of the core material (2) so as to be integrally formed. It is composed of a lightweight, sound-absorbing undercover for automobiles that is excellent in heat insulation and has water repellency on both sides.

  In addition, it is a porous sound absorbing structure, the thickness can be adjusted, the sound absorbing performance of the target frequency band can be designed to peak, and the mounting part etc. to increase the mounting strength, It is composed of a lightweight, sound-absorbing undercover for automobiles that is characterized by being adjustable to the optimum plate thickness.

  Next, the local cross-sectional structure of the under cover will be described. As shown in FIG. 1, the under cover is made by mixing GF (glass fiber) and PP material into the core material (2), and having a thickness of 50 μm on both surface portions. A reinforcing layer (1) such as a PP film of ˜500 μm is adhered.

  For reference, the types and attachment locations of the respective undercovers will be described. As shown in FIGS. 2A, 2B, and 2C, the undercover is provided at one lower portion of the engine of the automobile (CA). Engine under cover (EUC), three floor under covers (FUC) provided at the lower part of the floor, front mud guard (FMG) provided at the two tire house parts on the left and right front wheels, and two tire house parts on the left and right sides of the rear wheel There are four types of rear mudguards (RMG) to be provided, and they are provided at a total of eight locations.

  Therefore, the undercover of the conventional automobile (CA) was mainly the lower part of the engine, but the undercover of the automobile (CA) in recent years has been improved in quality and cost reduction due to weight reduction and strength increase as described above. Due to the rapid progress of pollution control against vibration and noise, and low noise and low vibration vehicles are becoming common sense, all noise sources are covered.

  The present invention achieves both sound absorption performance with a large soundproofing effect and surface water repellency, and can be reduced in weight by using a base material that is inflatable and excellent in strength, and is excellent in the strength of the terminal / attachment part. It has industrial applicability in terms of contributing to the automobile industry market.

FIG. 3 is a partial cross-sectional structure view of an undercover according to an embodiment of the present invention. The usage example of this invention is shown, (A) is a left side view of an automobile, (B) is a plan view showing an undercover attachment procedure for an automobile, and (C) is a perspective view showing an undercover attachment procedure for an automobile. is there.

Explanation of symbols

1 Reinforcing layer such as olefin resin 2 Core material 2a Reinforcing material such as glass fiber 2b Olefin resin CA Automobile EUC Engine under cover FUC Floor under cover FMG Front mud guard RMG Rear mud guard

Claims (2)

  An undercover that covers the entire lower surface of a vehicle floor, and the undercover is a mixture of a reinforcing material (2a) such as glass fiber that can handle a plate thickness of 1.0 mm to 10.0 mm and an olefin resin (2b). A core material (2) that expands a reinforcing fiber such as glass fiber, increases the light weight and rigidity with a low specific gravity of 0.05 to 0.85, and adds sound absorption performance; and a core material (2) By providing a reinforcing layer (1) such as an olefin-based resin on one or both sides and integrally forming it, it has excellent sound insulation, sound absorption and heat insulation properties, and has water repellency on both sides. A lightweight, sound-absorbing undercover for automobiles.   It is a porous sound-absorbing structure, the thickness can be adjusted, the sound-absorbing performance in the required frequency band can be designed to the peak, and the mounting parts etc. are optimal plates to increase the mounting strength. The lightweight and sound-absorbing undercover for automobiles according to claim 1, wherein the thickness is adjustable.

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