DE102009006989B4 - Sound insulation in a motor vehicle - Google Patents

Abstract

Sound insulation (1) in a motor vehicle, which is an integral part of an interior lining of the front wall of the motor vehicle in the region of cross member cowl (5) / vehicle-mounted end wall, with a heavy layer (3), characterized in that the heavy layer (3) on the front window ( 2) facing side web and ribs profiles (4).

Description

The invention relates to a sound insulation in a motor vehicle, which is integral part of an inner lining of the end wall of the motor vehicle in the cross member cowl / vehicle-mounted end wall, with a heavy layer.

The sound insulation of conventional end wall panels on the inside of the motor vehicle is due to the material properties wavy in the region of the cross member cowl and usually can not provide a contact surface for a sound insulation windshield or does not withstand the back pressure without deformation. This requires acoustic losses and additional risks when installing the windscreen.

This is in the generic DE 39 09 389 A1 a soundproofing for the interior of a vehicle has been proposed. A sound insulation consisting of a foam layer and a heavy layer is arranged between an instrument panel and a front wall upper part of a passenger car. The sound insulation has at its front edge region a convex curvature, which rests resiliently and thus soundproof to a rubber-elastic cover of the instrument panel.

In addition, the describes DE 197 05 683 C2 a sound insulation in a motor vehicle, which is glued along an edge region to an end wall, at least partially along the edge region of the sound insulation extends a strip-shaped clamping element, which serves for pressing the sound insulation to the end wall. The sound insulation described is characterized in that one located in the windshield (windscreen), consisting of a separate part skirt has an angled, and approximately parallel to the windshield (windshield) extending support leg, which in turn is supported on the end wall of the motor vehicle.

The structure of the prior art requires acoustic losses and additional risks when installing the windscreen (adhesive strip). The in the DE 197 05 683 C2 installed hold-downs cause additional costs and require increased logistics and assembly costs.

In contrast, it is the object of the present invention to provide a flexurally soundproofing an end wall of a motor vehicle in the windshield (windshield) an inherent stability, so that the required in the prior art fasteners or hold-down can be omitted.

The solution of the above object is achieved by incorporating web and rib profiles in the critical area of sound insulation of the front wall shell and by a special profiling of the heavy layer within the spring-mass system in this area.

A first embodiment of the present invention therefore comprises a sound insulation in a motor vehicle, which is an integral part of an inner lining of the end wall of the motor vehicle in the transverse member cowl / Fahrzeugaufbaufeste front wall with a heavy layer,
which is characterized by the fact that
the heavy layer has web and rib profiles on the side facing the windscreen.

By profiling the heavy layer, which rests parallel to the windshield on the cross member cowl, on the one hand, the bending stiffness of the component is significantly increased to counteract the formation of waves that can not be avoided with the measures of the prior art. According to the invention, a counter surface is thus created for the support of the SI front screen.

The web and rib profiles thus serve to increase the dimensional stability in the cross member cowl and the windshield, the interior lining of the vehicle-mounted end wall of the motor vehicle.

The lower support surface for supporting the sound insulation on the cross member cowl is preferably made of polyurethane foam or similar acoustically effective, a spring-forming material. In contrast, it is particularly preferred to produce the upper side of the sound insulation of a highly filled plastic material (mass). This material, which is commonly referred to as a heavy layer, contains commercially available plastics such as EVA / PE, PE, PP, EPDM, TPE, TPO and / or polyurethane foam, each with a high weight content, up to 70 wt .-%, of a mineral Filler high density, such as feldspar, are provided.

Particularly preferred according to the present invention, the stabilization measures also include reinforcing profiles in the form of webs and ribs, which are not on the upper side of the sound insulation (heavy layer), but on the underside of the heavy layer. These, like the upper reinforcement profiles, can be foamed or foamed with a polyurethane foam in order to obtain the spring-mass system.

The reinforcement profile attached to the underside additionally increases the rigidity against wave formation.

Together with the reinforcing profile formed on the underside, the necessary dimensional stability of the component area is achieved in order to be able to absorb the back pressure of the SI windscreen without deformation.

In a preferred embodiment of the present invention, the reinforcing profile is formed by ribs / webs, which extend in the installed state of the end wall panel substantially in the x / y direction of the vehicle. Alternatively, however, it is also possible to form a honeycomb structure instead of the ribs / webs, which causes an increased rigidity of the material in relation to the ribs / webs mentioned.

In the 1 is a sound insulation according to the invention 1 (Polyurethane foam 7 on the crossmember cowl 5 facing side not shown) shown;
along the windscreen 2 integral part of an interior lining of the vehicle-mounted end wall of the motor vehicle, wherein the heavy layer 3 on the front window 2 facing side bar and rib profiles 4 having.

In the 2 are in addition to the sound insulation according to the invention 1 also the cross member cowl 5 , the polyurethane foam 7 , the windscreen 2 and the SI front screen 6 shown.

Furthermore, in the 2 to recognize that the material shown in dotted, the lower bearing surface 7 (Polyurethane foam) for the application of sound insulation 1 on the cross member cowl 5 is made of a soft material.

In the 1 and 2 the reinforcing profile is shown in each case as a rib / web profile.

In the 3 is the underside of an embodiment of the present invention, in which the underside (the heavy layer 3 ) a reinforcing profile 8th here in the form of virtually parallel webs includes.

LIST OF REFERENCE NUMBERS

1

Soundproofing

2

windscreen

3

heavy layer

4

Bar / rib profile, top

5

Crossmember cowl

6

SI front screen

7

polyurethane foam

8th

Bar / rib profile, bottom

Claims (6)

Soundproofing ( 1 ) in a motor vehicle which is in the area of cross member cowl ( 5 ) / Fahrzeugaufbaufeste bulkhead is an integral part of an inner lining of the front wall of the motor vehicle, with a heavy layer ( 3 ), characterized in that the heavy layer ( 3 ) on the front window ( 2 ) facing web and rib profiles ( 4 ) having. Sound insulation according to claim 1, characterized in that the underside of the heavy layer ( 3 ) Bar and rib profiles ( 8th ) having. Soundproofing according to claim 1 or 2, characterized in that the underside of the heavy layer ( 3 ) by a polyurethane foam ( 7 ), or a melamine resin foam, or a textile fiber fleece is formed. Sound insulation according to one of claims 1 to 3, characterized in that the web and rib profiles ( 4 ) are foamed with a polyurethane foam. Sound insulation according to one of claims 1 to 4, characterized in that the heavy layer ( 3 ) including the web and rib profiles ( 4 / 8th ) comprises a highly filled plastic material (compact polyurethane foam (RIM), EVA / PE, EPDM, TPO, TPE). Sound insulation according to one of claims 1 to 5, characterized in that the web profile has rib and / or honeycomb structure.

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