WO2006119895A1

WO2006119895A1 - Sound insulating coating, in particular inner frontal wall lining for motor vehicles

Info

Publication number: WO2006119895A1
Application number: PCT/EP2006/004112
Authority: WO
Inventors: Marion Zybarth; Gerald Dreffke
Original assignee: Carcoustics Tech Center Gmbh
Priority date: 2005-05-10
Filing date: 2006-05-03
Publication date: 2006-11-16
Also published as: DE202005007646U1

Abstract

The invention relates to a sound insulating coating for internal space of a motor vehicle, in particular for application on the internal surface of a front wall (1) separating the engine space from the passenger compartment, comprising a heavy layer (3) and a plurality of space elements (4) which are protruded away from the rear side of the heavy layer towards the internal surface or to the front wall (1). In order to obtain the best airborne noise insulation, the best sound and structure-born nose damping associated with said coating, at least a part of the space elements (4) comprises an adhesive section (5) associated to the internal surface or to the front wall and an elastic wave- or bellows-shaped section (4.1, 4.2, 4.3).

Description

Sound-insulating cladding, in particular inside bulkhead cladding for motor vehicles

The invention relates to a sound-insulating cladding for an interior surface of a motor vehicle, in particular for attachment to the inside of a front wall separating an engine compartment from a passenger compartment, with a heavy layer and a plurality of spacer elements extending from the back of the heavy layer in the direction of the inner surface or end wall to be clad protrude.

Such a panel is known from GB 2 216 081 A. The cladding shown there is a front wall cladding, which consists of a heavy layer with spacer elements formed thereon and is produced as a molded part made of thermoplastic elastomer in the strand-forming molding process. The spacer elements are preferably designed to achieve a relatively high stiffness of the cladding as webs of a grid. However, if the stiffness of the cladding is not important, they may also be designed as pins which protrude from the back of the heavy layer. The heavy layer of the lining forms with the end wall of a double-walled construction, wherein the clear width between the heavy layer and the end wall by the tips of the spacer elements which contact the end wall, is precisely defined. The well-known Cladding may also be provided with an absorber layer having slots for receiving the web-shaped spacers. The acoustic effectiveness of this known cladding can still be improved, in particular with regard to structure-borne sound damping.

The present invention has for its object to provide a sound-insulating cladding of the type mentioned above, which also provides good or even improved airborne sound attenuation and sound insulation improved structure-borne sound damping.

This object is achieved by a cladding with the features of claim 1.

The lining according to the invention comprises a heavy layer and a plurality of spacer elements which protrude from the rear side of the heavy layer in the direction of the vehicle inner surface or vehicle end wall to be clad. According to the invention, at least some of the spacer elements have an adhesive portion assigned to the inner surface / end wall, wherein at least a part of the spacer elements has a wave-shaped and / or spring-bellows-shaped suspension portion.

An effective and reliable coupling of the relevant distance element of the sound-insulating lining to the vehicle interior surface or vehicle end wall to be clad is ensured by the respective adhesion section, whereby in conjunction with the wave-shaped and / or spring-bellows-shaped suspension sections, it is a great idea! improved structure-borne sound attenuation is achieved. The lining according to the invention acts as an acoustic spring-mass system whose spring Effect is given by the suspension sections of the spacer elements and the air cushion between heavy layer and clad inner surface or end wall, while the associated mass is essentially defined by the heavy layer.

According to a preferred embodiment of the lining according to the invention whose adhesive portions are formed in the form of suction cups. Suction cups may in principle be applied at different locations on the inner surface or end wall to be covered, i. their place of attachment is variable. They thus allow for the assembly of the panel a certain tolerance compensation. In addition, if necessary, suction cups can also be removed without residue from the inner surface / front wall to be clad, which is advantageous in terms of a sorted recycling.

A further preferred embodiment of the lining according to the invention is that the spacer elements having a suspension portion are formed so that they have different spring constants (restoring forces). As a result, it is possible to achieve both broadband and thus improved airborne sound absorption as well as improved structure-borne sound damping.

Further, the provided with a suspension portion spacers of the lining according to the invention are preferably designed so that they have deliberately set, optionally also different spring characteristics. The Federkennl the respective spacers can be progressive, degressive or substantially linear and are the acoustic Requirements adapted. Thus, a part of the spacer elements acting as a spring may have progressively extending spring characteristics, while another part of the spacer elements provided with suspension sections has degressive or substantially linear spring characteristics.

A further advantageous embodiment of the lining according to the invention is that the heavy layer is provided with at least one Tüllenförmig formed opening. The opening is used to pass a cable harness, a hose or a steering column, through the sound-insulating planar panel. The design of the opening in the form of an elastic spout, which is preferably conical and / or provided with slots, allows a sound-insulating seal of the passed components, so that at this point a sound flow from the engine compartment is largely prevented in the passenger compartment.

In order to achieve optimum sealing and compensation of possible manufacturing tolerances, it is also proposed to design the tüllenförmig formed opening or spout spring bellows.

As a further embodiment of the lining according to the invention it is provided that the tüllenförmig formed opening has an outer groove, a radially projecting collar and / or a radially projecting flange portion. This embodiment allows a positive connection ≥rfindungsgemäßen panel or the Tüllenförmig formed opening at an associated opening of the to be clad Body inner surface or end wall, wherein the positive connection can act as a seal and is easily solvable if necessary.

Further preferred and advantageous embodiments of the lining according to the invention are specified in the subclaims.

The invention will be explained in more detail with reference to a drawing illustrating several embodiments. They show schematically:

Fig. 1 shows a section of a panel mounted on a body panel according to the invention in cross-section;

FIG. 2 shows a sound absorber layer in plan view; FIG.

Fig. 3 shows a section of another on a

Body panel mounted inventive panel in cross-sectional view;

Fig. 4 shows a portion of a third embodiment of a panel according to the invention in cross-section;

5 shows a section of a fourth embodiment of a panel according to the invention, attached to a body panel, in cross-sectional view. and

Fig. 6 shows a portion of another panel according to the invention with mι ≥n, each having an adhesive portion having spacers. In Fig. 1, a portion of a body panel 1, for example, an end wall of a motor vehicle is shown, which separates the engine compartment from the passenger compartment and is arranged more or less vertically. On the inside of the end wall 1, that is, on the side facing the passenger compartment, a sound-insulating panel 2 is arranged according to the invention. The cladding 2 consists of a laminar heavy layer 3, whose end wall 1 facing rear side with a plurality of spacer elements (spacers) 4 is provided. The spacers are integrally formed on the heavy layer 3. The heavy layer 3 and the spacer elements 4 are for example made of thermoplastic elastomer (TPE), in particular based on olefins

(TPO) or based on styrene (TPE), or made of soft, unfoamed polyethylene (PE), unfoamed low density polyethylene (LDPE) or polyvinyl chloride, with TPS with a high content of filler being particularly preferred. The proportion of the filler is preferably at least 60 wt .-%, in particular more than 70 wt .-%. As a filler may be used in the plastic used for the heavy layer and the spacer elements

(Elastomer) in particular magnetite, calcium carbonate and barium sulfate are used in finely ground form. The production of the heavy layer including the spacer elements by injection molding using appropriate tools (molds).

At least a portion of the spacer elements (spacers) 4 has at its end wall 1 facing ends a verbu i with the end wall 1 i Adhesive 5 on. The adhesive portions 5 are formed in the manner of a suction cup. The adhesive sections or suction cups 5 serve the structure-borne sound damping. In this context, it is also possible to speak of a deadening of the body panel or of the front wall 1 by the spacer elements 4 having an adhesive portion 5.

The spacers 4 may be formed like a stick, web-shaped and / or rib-shaped. The web-shaped or rib-shaped spacer elements thereby preferably delimit cassette-shaped hollow chambers (air chambers) 6.1, 6.2, 6.3, which represent different, defined partial volumes. At least a portion of the hollow chambers 6.1, 6.2, 6.3 can be connected via gap openings (not shown) in circumferential spacing elements 4 and thus belong to a common cavity.

Furthermore, it can be seen that at least part of the spacer elements 4 each have a wave-shaped suspension section 4.1, 4.2, 4.3. The lining 2 according to the invention thus represents an acoustic spring-mass system.

The suspension sections are designed differently, so that different spring characteristics and different spring constants (restoring forces) result. The suspension sections can in particular have a substantially U-shaped compensation arc (4.3) or a substantially S-shaped (4.2) or multiple S-shaped (4.1) shape. The spring characteristics are also influenced by the design of the heavy layer 3. As shown in Fig. 1, are on the heavy layer 3 Flächenbe = 3.1, 3.3 formed with different layer thickness. In particular, stiffening ribs 3. 3 and / or stiffening beads 3. 3 can be formed in the heavy layer 3 in a targeted manner. As a result, the bending stiffness of the heavy layer 3 is set locally and thus the spring characteristics of the suspension sections 4.1, 4.2, 4.3 and the vibration properties of the heavy layer 3 are influenced.

The suspension elements 4.1, 4.2, 4.3 having spacer elements 4 are formed such that the heavy layer 3 relative to the associated body inner surface or end wall 1 by a travel of at least 3 mm, preferably at least 5 mm, in particular at least 10 mm movable. The overall height h of the lining 2 according to the invention is in the range of 10 to 45 mm, preferably in the range of 15 to 35 mm.

As shown in Fig. 1, the panel 2 according to the invention may additionally be provided, if necessary, with a textile and / or open-pore sound absorbing layer 7 in order to achieve a broader sound absorption. The sound absorber layer 7 may, for example, consist of open-pore foam or nonwoven material and be embodied as one or more layers. The sound absorbing layer 7 may optionally cover the back of the heavy layer 3 over the entire surface. Preferably, however, the sound absorber layer 7 is only partially and selectively arranged where a broadband sound absorption is desired (see FIG. 1).

The sound absorber layer. t not connected to the heavy layer 3 cohesively, but positively. For this purpose, the sound absorber layer 7 openings 8, which are penetrated by spacers 4. In Fig. 2 shows a blank of a sound absorber layer 7 is shown, which has a plurality of perforations or holes 8 for receiving stalk-shaped spacer elements 4.

In Fig. 3, another embodiment of a panel 2 according to the invention is shown. This sound-insulating cladding also consists of a laminar heavy layer 3 whose rear side facing a body inner surface (for example front wall) is provided with a multiplicity of spacers (spacers) 4. The spacers 4 are in turn integrally formed on the heavy layer 3. It can also be seen that the heavy layer has areas 3.1, 3.2 of different layer thickness. The lining 2 shown in FIG. 3 is a single-substance system.

The spacers (spacers) 4 of the sound-insulating panel 2 are formed differently. Similar to the cladding according to FIG. 1, initially there is a stick-shaped spacer which has a substantially S-shaped configuration (4.2) and a suction-cup-like foot section (adhesion section) 5.

Furthermore, at least one spacer 4 'is formed on the heavy layer 3, which has a cup or thimble shape and is open towards the front of the heavy layer 3. The bottom of the cup-shaped or thimble-shaped spacer 4 'is formed as a suction cup foot section 5' e. Furthermore, stalk- or columnar spacers 4 "may also be formed on the heavy layer 3, which have an elongated cavity 9 extending along the longitudinal central axis of the spacer element and open at the end adjacent to the bodywork inner surface 1 to be covered is. Alternatively, the spacer elements (spacers) 4 "may also be trumpet-shaped, as shown by way of example in FIG. 6. The spacer elements 4 '', the funnel-shaped widened end 5 'of which adheres to the bodywork inner surface 1 to be clad, again act as absorbent elements damping the structure-borne noise.

The heavy layer 3 of the lining 2 shown in Fig. 3 also has at least one nozzle-shaped opening 10 which serves the sealed passageways of a cable harness (not shown) or a hose line (not shown). To achieve a reliable seal, the sleeve-shaped opening 10 is made double conical, so that it has a sealing constriction or constriction 10.1.

The Tüllenförmig formed opening 10 - hereinafter also called short grommet - is also preferably designed spring bellows. The nozzle 10 thus has a relatively high flexibility and good adaptability, which is particularly favorable in terms of compensation of manufacturing tolerances.

At the end facing the body panel (end wall) 1 facing di <Lenförmig formed opening 10 has a radially projecting collar or Flange 11, which engages behind an associated opening 12 in the body panel 1.

The bellows-shaped nozzle 10 is dimensioned with respect to the spacers 4 so that the latter project beyond the collar or flange 11 in the unassembled state of the lining 2. However, the elastic spout 10 can be stretched axially during assembly by applying a tensile force, so that the collar or flange 11 can be anchored in a form-fitting manner behind the opening 12 of the body panel 1. The tensile force which continues to be effective in the spout 10 after assembly assists the adhesive action on the spacer elements 4, 5 'having an adhesive portion 5, 5'.

The embodiment shown in Fig. 4 differs from the embodiment of FIG. 3 only in terms of the design of the tüllenförmig formed opening 10. In this case, the spout 10 'is formed longer than the spout 10, in turn, a radially projecting collar or flange 11 is provided for the positive anchoring of the spout 10 'at an associated opening 12 of the body panel 1. Instead of a radially projecting flange or collar 11 may be formed on the spout 10, 10 'and an outer groove for the positive anchoring of the spout to the opening 12. The sleeve section 10.2 projecting beyond the radially projecting collar or flange 11 (or the optional external groove) tapers towards the open end facing the engine compartment.

Fig. 5 shows another embodiment of a sound-insulating lining according to the invention 2. Bei this embodiment, 3 bellows-shaped spacers 4 are formed on the heavy layer. The sectional elements 4 shown cut are formed in the manner of a plate spring, which is composed of relatively flat, circular cone rings. In the present case, however, the flat conical rings 4.4 merge into one another in one piece. At their end facing away from the heavy layer 3, the spacer elements 4 each have a foot section 5 'formed as a suction cup.

The heavy layer 3 is also provided with at least one Tüllenförmig formed opening 10.

The spacer elements acting as elastic springs 4 and the bellows-shaped nozzle 10, 10 'can be prefabricated separately and molded in a corresponding injection mold with the heavy layer 3 forming elastomer mass, so that a one-piece component 2 results. In this case, areas 3.1, 3.2 of different layer thickness can be formed in the heavy layer 3.

As shown in Fig. 5, the heavy layer 3 can be provided on its side facing away from the spacer elements 4 also with a carpet layer 13 or other textile Dekorbelag. The lining 2 according to the invention can be used in particular as a subfloor construction for a carpet construction of a motor vehicle. The carpet can this be back-injected with the heavy layer 3 forming plastic or elastomer composition. The above description makes it clear that the design of the layer thickness (wall thickness) and the contours of the heavy layer 3 and acting as springs spacers 4, the spring characteristics can be selectively adjusted to the sound-insulating panel 2 as a spring-mass system to the respective acoustic requirements optimally adapt. The bending stiffness of the cladding 2 can be adjusted in particular by the choice of fillers and base polymers. By Wandstärkenvariation the partial mass can be placed specifically.

The invention is not limited in its execution to the embodiments shown in the drawing. Rather, a number of variants are possible, which also make use of the invention specified in the appended claims. Thus, for example, the panels shown in FIGS. 3 to 6 may optionally be provided with an additional sound-absorbing layer 7, as is the case for example with the exemplary embodiment according to FIG.

Claims

PATENT APPLICATIONS

A sound-insulating lining for an inner surface of a motor vehicle, in particular for attachment to the inside of an engine compartment of a passenger compartment separating end wall (1), with a heavy layer (3) and a plurality of spacer elements (4) from the back of the heavy layer in Direction of the inner surface or end wall (1), characterized in that at least a part of the spacer elements (4, 4 ', 4' ') has an inner surface / end wall associated adhesive portion (5, 5') and that at least a portion of the spacer elements ( 4, 4 ', 4' ') has a wave-shaped and / or bellows-shaped spring portion (4.1, 4.2, 4.3, 4.4).

2. Cladding according to claim 1, characterized in that the respective adhesive portion (5, 5 ') is in the form of a suction cup.

3. Cladding according to claim 1 or 2, characterized in that the one spring portion (4.1, 4.2, 4.3, 4.4) having spacer elements (4) are formed such that they have different spring constants.

4. Panel according to one of claims 1 to 3, d a d u r c h e c e n e e c e s in that the a (4.1, 4.2, 4.3, 4.4) having a suspension section (4) are formed such that they have different spring characteristics.

5. Cladding according to one of claims 1 to 4, characterized in that the one suspension section (4.1, 4.2, 4.3) having spacer elements (4) are formed such that the heavy layer (3) relative to the associated inner surface / end wall (1) around a Travel of at least 3 mm, preferably at least 5 mm is movable.

6. Cladding according to one of claims 1 to 5, characterized in that the heavy layer (3) has surface areas (3.1, 3.2) of different layer thickness.

7. Cladding according to one of claims 1 to 5, characterized in that the spacer elements (4, 4 ', 4' ') are bar-shaped, stalk-shaped and / or column-shaped.

8. Panel according to one of claims 1 to 7, characterized in that the one adhesive portion (5) having spacer elements (4 '') are formed as a stem-shaped or columnar hollow body.

9. A cladding according to claim 8, characterized in that the stem-shaped or columnar hollow body has an opening which faces the inner surface / end wall (1) to be clad.

10. Cladding according to claim 8, characterized in that the stem-shaped or columnar hollow body has an opening facing away from the inner surface / end wall (1) to be clad.

11. Cladding according to one of claims 1 to 10, characterized in that the heavy layer (3) is provided on its back with spacers (4), which together with the heavy layer (3) serving as air chambers (6.1, 6.2, 6.3) cassettes define.

12. Cladding according to one of claims 1 to 11, characterized in that the heavy layer (3) is provided with at least one sleeve-shaped opening (10, 10 ').

13. Cladding according to claim 12, characterized in that the sleeve-shaped opening (10, 10 ') is formed like a bellows.

14. Cladding according to claim 12 or 13, characterized in that the Tüllenförmig formed opening (10, 10 ') has an outer groove and / or a radially projecting collar and / or a radially projecting flange (11).

15. Cladding according to one of claims 1 to 14, characterized in that it is provided with a textile and / or open-pored sound absorber layer (7) which has openings (8) which are penetrated by spacer elements (4).

16. Cladding according to one of claims 1 to 15, characterized in that the heavy layer (3) on its side facing away from the spacer elements (4, 4 ', 4' ') facing side is provided with a textile decorative cover (13).

17. A cladding according to any one of claims 1 to 14, d a d u r c h e c e n e c e s in that it is formed as a single-substance system.

18. Cladding according to one of claims 1 to 17, characterized in that the heavy layer (3) and the spacer elements (4, 4 ', 4' ') of thermoplastic elastomer based on styrene and filler are formed.