JP2007098964A - Interior trimming material for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interior trimming material for a vehicle capable of reducing the sound such as squeaking caused by rubbing with a vehicle structure. <P>SOLUTION: The interior trim 1 for the vehicle formed from a synthetic resin (for example, foaming polystyrene series resin) is configured so that part or the whole of its surface contacting with a vehicle structural member is shaped as a projection 3 formed from a different material (for example, foaming polypropylene series resin or foaming polyethylene series resin) having a sound level generated at the time of contacting with the vehicle structural member which is lower than the sound level when the synthetic resin constituting the trim body 2 contacts with the vehicle structural member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an interior material for a vehicle formed of a synthetic resin, and more particularly to an interior material for a vehicle that can reduce a sounding level such as a squeaking noise generated with a vehicle structure.

  Synthetic resin products are often used as interior materials in many vehicles such as automobiles. Non-foamed synthetic resin products are also used, but foaming of synthetic resin is necessary for the purpose of improving cushioning and improving ride comfort, absorbing impacts to protect passengers, and ensuring flatness in the vehicle. Car interior materials that are molded products are often used. Various resins such as expandable urethane and expandable polystyrene are used as the expandable synthetic resin, but expandable polystyrene resins are often used because of their excellent moldability and functionality.

  When the synthetic resin foam molded articles rub against each other, or when the vehicle structure and the vehicle interior material, which is a synthetic resin product, rub against each other, a noise such as a squeaking noise or a frictional sound is generated between them. Since such a sound makes an occupant feel uncomfortable, for example, in the case of an interior material for a vehicle, a felt is attached to the back surface thereof. However, in the case of felt, it has been a problem that the cost is high and it takes a lot of man-hours to attach both of them with an adhesive or a double-sided adhesive tape.

  As another solution, Patent Document 1 proposes to apply a surfactant to the contact surfaces of parts that are synthetic resin foams, and Patent Document 2 discloses a vehicle interior material such as ABS resin. It has been proposed that a convex portion having a predetermined height is provided at a portion facing a mounting surface at a predetermined mounting location in the vehicle, and a coating layer having a low friction coefficient is formed on the surface of the convex portion.

JP-A-10-298341 JP-A-7-246888

  The method of applying a surfactant as described in Patent Document 1 in order to eliminate the noise can produce a certain effect over a long period of time between contact surfaces of parts that are synthetic resin foams. A noise prevention effect cannot be maintained over a long period of time between a vehicle structure that is usually made of metal and a synthetic resin material (vehicle interior material). Also, the operation of applying the surfactant is not easy. In the method of forming a coating layer having a low friction coefficient described in Patent Document 2 on the contact surface, an effective sound can be obtained by selecting an appropriate paint material from the relationship with the material of the vehicle structure which is the counterpart. Although the prevention effect can be expected, since it is a coating film and the coating film layer itself is superficial, it is inevitable that the effect gradually fades by the use of long days.

  The present invention has been made in view of the circumstances as described above, and can effectively reduce the level of noise generated between the vehicle structure and the vehicle over a long period of time while being manufactured at a low cost. An object of the present invention is to provide a vehicle interior material.

  An interior material for a vehicle according to the present invention is an interior material for a vehicle formed of a synthetic resin, and has a noise level generated when all or a part of a surface in contact with the vehicle structural material is in contact with the vehicle structural material. The synthetic resin constituting the vehicle interior body is a convex portion formed of a different material having a level lower than the level of sound generated when the synthetic resin comes into contact with the vehicle structural material.

  In this invention, the synthetic resin material which comprises the vehicle interior material main body part except a convex part is arbitrary, and there is no restriction | limiting in particular. Conventionally used synthetic resin materials can be used as appropriate. It may be a molded product of non-foamed material or a foamed molded product. The dissimilar material that forms the convex part has a noise level that is generated when it comes into contact with the vehicle structural material, and a noise level that is generated when the synthetic resin material that constitutes the vehicle interior body comes into contact with the vehicle structural material. It is optional on the condition that the material is a different material that is lower than the level, and may be a non-foamed material or a foamed material.

  In the vehicle interior material according to the present invention, all or a part of the surface in contact with the vehicle structural material is a convex portion, and the portion is formed of the above-described different material. Therefore, the material cost for the dissimilar material can be reduced as compared with the conventional case where the felt is pasted on the entire back surface. Moreover, since the whole convex part is formed with a dissimilar material, compared with what forms the conventional thin coating film, the effect of reducing the sound level over many days can be maintained.

  For the formation of the convex portion, a member to be the convex portion is formed in advance, and it may be formed retrofitted with an adhesive or the like on the portion of the vehicle interior material body that comes into contact with the vehicle structure. A molding method may be used in which the members that become the protrusions are integrated when molding the interior material.

  In the vehicle interior material according to the present invention, the vehicle interior material main body portion excluding the convex portion is preferably a foam molded product made of a foamable synthetic resin, particularly a foamable polystyrene resin. The reason is that, compared with other expandable synthetic resins, the expandable polystyrene resin has good moldability and also has an excellent function as a vehicle interior material. When the vehicle interior material body is a foamed molded product of a foamable polystyrene resin, it is desirable that the dissimilar material forming the convex portion is a foamable polypropylene resin or a foamable polyethylene resin. The level of squeaking noise generated between the foamed polypropylene resin or foamed polyethylene resin foamed metal product with the metal plate is lower than the foamed polystyrene resin foam molded product. And the noise is greatly reduced. In the case of a foamable polyethylene resin, the styrene-modified foamable polyethylene resin is an effective convex material.

  When the vehicle interior material body is a foamed molded product of expandable polystyrene resin, when molding the vehicle interior material body, the above-mentioned convex material is put in the mold, and in that state By performing in-mold foam molding, the vehicle interior material according to the present invention in which the vehicle interior material main body and the convex portion are integrated can be obtained simultaneously with the molding.

  In the vehicle interior material according to the present invention, the surface of the convex portion formed of a different material may be a flat surface, but it is more preferable to form a concavo-convex pattern, thereby, as shown in the following examples, The sound level is further reduced.

The interior material for a vehicle according to the present invention can greatly reduce irregular noise such as a squeaking sound that is annoying to the passenger. Even if it occurs, the level is very small. Therefore, the vehicle interior material according to the present invention can be used as a vehicle interior material for any vehicle including an automobile. In the case of an automobile, the vehicle interior material is particularly effective as a vehicle interior material such as a floor spacer, a door pad, and a tool box. Used.

  FIG. 1 shows a floor spacer 1 as an example of a vehicle interior material according to the present invention. In this example, the floor spacer 1 includes a main body portion 2 that is a foam molded product made of an expandable polystyrene-based resin, and a rear surface side of the main body portion 2. When the main body portion 2 is attached to a vehicle, And a plurality of convex portions 3 formed on a portion in contact with (not shown). The body portion 2 is formed with a large number of recesses 4 as meat stealing portions.

  In this example, the convex portion 3 is a foam-molded product of a styrene-modified polyethylene resin, and a product molded in advance to a predetermined size and shape is used as a place in the mold at the time of in-mold foam molding of the main body portion 2. The main body part 2 is integrated with the main body part 2 simultaneously with the foam molding of the main body part 2. As another method, the convex portions 3 may be retrofitted to a predetermined portion of the body portion 2 formed by in-mold foam molding using an adhesive or the like, and the two portions may be integrated.

  The above-mentioned vehicle interior material 1 has only the main body portion 2 that does not have the convex portion 3, and has the entire back surface in contact with the vehicle structure when mounted on the vehicle, or the same raw material as the main body portion 2. Compared with the case where the convex part formed in the above is in contact with the vehicle structure, it is possible to greatly reduce the irregular sound such as the squeaking noise that is annoying to the occupant, and even if it occurs, the level is extremely small .

[Test example]
Itching sound was measured using the apparatus shown in FIG. The apparatus 10 can move left and right on the base 11, ten metal rolls (diameter 40 mm × length 150 mm) 12 arranged on the base 11 so as to be rotatable at equal intervals, and the metal roll 12. And a moving plate 13 disposed on the surface. The moving plate 13 includes a surface-plated metal plate (thickness 10 mm) 14 that moves in contact with the surface of the test body 20, and a buffering felt (thickness 15 mm) 15 attached to the back surface thereof. This surface-plated metal plate 14 is assumed to be a standard structure of an automobile.

  The apparatus 10 further supports a support frame 16 composed of four support columns that stand up with the moving plate 13 sandwiched from both sides, and is supported on the support frame 16 so as to be freely movable in the vertical direction via a sliding tool 17. The load supporting plate 18 is provided, and a fixing tool 19 for fixing the test body 20 is attached to the back surface of the load supporting plate 18.

  In the test, four types of synthetic resin foam molded articles shown in Table 1 were prepared, and a plate material having a length of 40 mm, a width of 40 mm, and a thickness of 20 mm was cut out from the plate and used as the test body 20. The expansion ratio of the four types of foamed molded products was 30 times. The test body 20 was fixed to the fixture 19 on the back surface of the load support plate 18, the load support body 18 was lowered, and the lower surface of the test body 20 was brought into contact with the surface plated metal plate 14. Thereafter, a load was placed on the load support plate 18 to adjust the load on the surface plated metal plate 14 of the test body 20 to 5.4 kg.

  In this state, the average sound pressure (sounding level) (db) generated when the moving plate 13 was moved 200 mm left and right 20 times each was measured by the noise measuring device 30. The test was conducted at 50 ° C. and −20 ° C. assuming the highest and lowest ambient temperature at which the car is placed. The results are shown in Table 1.

  The column of polystyrene resin in Table 1 corresponds to the vehicle interior material body 2, and the column of polypropylene resin and the 2 columns of styrene-modified polyethylene resin are formed in the vehicle interior material body. It corresponds to the convex part 3. As shown in Table 1, the polystyrene resin foam-molded product showed a high squealing sound (sounding level) of 110 decibels, but the polypropylene resin and styrene-modified polyethylene resin foam-molded products were 85-80. It shows decibels and low squealing (sounding level).

  Therefore, as in the vehicle interior material 1 according to the present invention, the convex portion 3 formed from a material (for example, a polypropylene resin or a styrene-modified polyethylene resin) different from the main body (for example, a polystyrene resin) 2 is provided. It is shown that an interior material for a vehicle with less noise can be obtained by forming the portion in contact with the vehicle structure.

The figure which shows an example of the interior material for vehicles by this invention. The figure explaining the apparatus for measuring a squeaking sound used in the test example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle interior material (floor spacer) by this invention, 2 ... Main-body part, 3 ... Convex part, 10 ... Device for measuring a squeaking sound, 11 ... Base, 12 ... Metal roll, 13 ... Moving plate, 14 ... Surface Plated metal plate, 15 ... buffer felt, 16 ... strut, 17 ... sliding tool, 18 ... load support plate, 19 ... test specimen fixing tool, 20 ... test specimen

Claims (3)

  A vehicle interior material formed of a synthetic resin, wherein the sound level generated when all or part of the surface in contact with the vehicle structural material comes into contact with the vehicle structural material constitutes the vehicle interior product body. An interior material for a vehicle, characterized in that it is a convex portion formed of a dissimilar material that is at a level lower than the level of sound produced when the resin comes into contact with the vehicle structural material.   The vehicle interior material main body is a foam molded product made of a foamable polystyrene resin, and the different material forming the convex portion is a foamable polypropylene resin or a foamable polyethylene resin. Interior material for vehicles.   The interior material for a vehicle according to claim 1 or 2, wherein the surface of the convex portion formed of a different material has an uneven pattern.

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