Motor vehicle with a roller shutter

Abstract

Motor vehicle with a roller blind which is arranged in the area below a closable roof opening of the motor vehicle and can be moved parallel to the direction of travel of the motor vehicle, characterized in that the roller blind is designed to be air-permeable and has a flow resistance of more than 500 Pa·s / m and less than 2,500 Pa·s / m, such that the roller blind (2) together with the air volume (L) between the closed roof opening and the roller blind (2) forms an airborne sound absorption system.

Description

[0001] The invention relates to a motor vehicle with a roller shutter according to the preamble of claim 1.

[0002] From DE 10 2005 062 973 A1, a motor vehicle of this type is known, featuring a roller blind in the area below a lockable roof opening. A glass sliding roof, a glass retractable roof, or the like is provided for closing the roof opening. The roller blind serves to block the interior of the motor vehicle from the light entering through the glass sliding roof.

[0003] A disadvantage of the known motor vehicle is that, with the roof opening closed, the acoustic properties in the interior of the motor vehicle are noticeably worse compared to a similar motor vehicle without a roof opening, since the interior roof lining is interrupted at the position of the roof opening and the known roller blind cannot compensate for this deficit.

[0004] German patent DE 10 2007 029 290 A1 discloses a flexible protective visor for a vehicle, in particular a sun visor. The flexible surface structure has a first layer which is elastically stretchable at least in sections, and a second layer above it which is designed as a UV protection layer.

[0005] The object of the invention is to improve the acoustic properties in the interior of a motor vehicle which has a roof opening and a roller blind in the area below a roof opening.

[0006] This problem is solved by a motor vehicle with the features of claim 1. The core concept of the invention is to provide a roller blind with a defined air permeability, wherein the roller blind has a flow resistance of approximately 500 to 2,500 Pa·m / s, preferably a flow resistance of approximately 750 to 1,500 Pa·m / s, and particularly preferably approximately 1,000 Pa·m / s. With such a flow resistance of the roller blind, an acoustically effective system is formed, consisting of the roller blind and the air space above the roller blind when the roof opening is closed, wherein the system acts as an efficiently functioning airborne sound absorption system. Crucially, the flow resistance of the roller blind, in conjunction with the volume of the air space between the top of the roller blind and the underside of the roof cover closing the roof opening, enables optimal sound absorption.The greater the distance between the roller blind and the underside of the roof cover (usually a glass cover) that closes the roof opening, the lower the frequency and therefore the wider the absorption range of the system. With increasing distance, the absorption characteristics primarily improve at lower frequencies. Thus, the distance between the top of the roller blind and the underside of the roof cover is crucial for the frequency range in which the system is acoustically effective. Generally, complete absorption is achieved when the distance is one-quarter of the wavelength of the sound waves.

[0007] If the roller blind has a structure with several material layers, the flow resistance across all material layers of the roller blind is crucial for the design of the acoustic system.

[0008] The invention significantly improves noise comfort in the vehicle's interior. As a result of the invention, the acoustic properties of the vehicle's interior are comparable to those of an otherwise identical vehicle without a roof opening, where the headliner (also called the "headliner") covers the entire interior roof surface without a window-like cutout for the roof opening. This is particularly true for vehicles with headliners that have highly sound-absorbing properties. The invention has a particularly strong effect on the perception of the vehicle's occupants, as the acoustically highly effective roller blind absorbs sound near the head of a vehicle occupant and is therefore perceived with particular intensity.As a result of the highly effective acoustic measure in the area of ​​the headliner, other measures for sound insulation and / or sound absorption in the interior of the vehicle can be reduced or even completely eliminated, with advantages in terms of cost, weight and the installation space required for the entire vehicle.

[0009] In principle, the invention not only absorbs noises present in the interior, but also external noises (for example, airflow, rolling and passing noises, wet hissing, stone chip noise, etc.), airflow noise from the sunroof, noise from the sunroof drainage, etc. Even in motor vehicles with "leather seats", which generally have a poorer absorption characteristic due to their lower sound absorption capacity compared to motor vehicles with "fabric seats", the invention can significantly improve the interior acoustics.

[0010] In a preferred embodiment of the invention, the roller blind itself is designed to be air-permeable.

[0011] In an advantageous embodiment of the invention, an air-permeable textile panel is provided as the acoustically effective roller blind. In connection with the present invention, the term "porous" is used for such an air-permeable roller blind made of a textile material to express that the textile's construction has an open structure that is more or less permeable to air currents. In principle, all textile fabrics exhibit such "porosity," regardless of how the textile material is manufactured, for example, woven, needle-punched, knitted, etc. In principle, all suitable natural, synthetic, or blended fibers are eligible as materials.

[0012] Alternatively, the acoustically effective roller blind can have an air-permeable layer made of a plastic material.

[0013] In an alternative embodiment of the invention, the roller blind is formed from an airtight sheet that is intentionally provided with a multitude of perforations to achieve a defined air permeability and thus a precisely measured air resistance. However, it should be noted that undesirable patterns may appear on the underside of the roller blind due to the perforation, particularly when light enters through the roof opening. Similarly, the perforation pattern may become visible on a decorative layer arranged on the underside of the roller blind. The airtight roller blind can, for example, be a film made of an airtight plastic material that is made airtight by introducing holes (perforations), for example, by punching.

[0014] The airtight membrane can consist of a textile web, a plastic film, or a combination of both. For example, an inherently airtight, perforated plastic film can be applied to an air-permeable textile substrate. Airtightness in a purely textile web is achieved, for example, through coating, impregnation, adhesive application, etc.

[0015] The roller blind can be designed as a single-layer panel, which inherently exhibits the desired airflow resistance. The underside of the single-layer panel, facing the vehicle's interior, is preferably designed to have an attractive appearance.

[0016] In an alternative embodiment of the invention, the roller blind is composed of several layers. For example, a decorative layer and / or a cover layer are attached to the underside of one or more air-permeable layers.

[0017] In this design, the roller blind can be formed from a combination of a cover layer and a decorative layer, which together guarantee the desired airflow resistance and the required mechanical properties. In this embodiment, the cover layer has the task, among others, of providing the mechanical stability for the roller blind, since the decorative layer alone is not sufficiently stable in this case.

[0018] The individual strips of the roller blind are bonded together with at least one layer of adhesive.

[0019] For the above-mentioned exemplary designs with successive material layers, the airflow resistance of the entire roller blind system—i.e., the air-permeable material and / or decorative layer and / or cover layer as well as adhesive layer(s)—is crucial for the tuning of the sound absorption system. The airflow resistance can be significantly adjusted by varying, for example, the adhesive application.

[0020] In a preferred embodiment of the invention, the roller blind is light-tight, wherein, in the case of a perforated roller blind, at least one further layer (decorative layer, cover layer) is present that ensures opacity. In the case of a roller blind made of a porous material, the roller blind itself can ensure opacity, for example, by a correspondingly fine mesh design of the textile material.

[0021] In the context of the present invention, the roof opening is a cutout in the otherwise closed roof surface of the motor vehicle, which can be closed by the cover of a so-called sunroof, a lifting roof, a sliding / tilting roof, or the like. Preferably, the cover is made of a translucent material, usually glass.

[0022] One possible embodiment of the invention is shown in the drawing and is explained in more detail below. It shows: Fig. 1 a schematic sectional view of a first embodiment of the invention, with a single-layer roller blind and Fig. 2 a schematic sectional view of a second embodiment of the invention, with a multi-layered roller blind.

[0023] In a motor vehicle (not shown in detail) with a roof opening that can be closed by a sunroof panel 4, a roller blind, designated as a whole by 2, is arranged to be rolled up in the area below the sunroof panel 4. The rolling mechanism and the space for the rolled-up roller blind 2 are not shown. The sunroof panel 4 is preferably made of a transparent material, but can also be an opaque panel. The sunroof panel 4 can be moved between an open and a closed position. In its sealing position shown in the drawing, the roller blind 2 is positioned essentially flush below the sunroof panel 4 and seals off the interior 6 of the motor vehicle from the ingress of ambient light. An air gap L is present between the top of the roller blind 2 and the underside of the sunroof panel 4.

[0024] In a first embodiment of the invention according to Fig. 1 the roller blind 2 is single-layered, with an air-permeable layer 10 directly forming the roller blind 2, which may be perforated or porous.

[0025] In a second embodiment of the invention according to Fig.In this embodiment, the roller blind 2 is multi-layered and comprises air-permeable layers 10 and 12. The upper layer 10 serves as the support layer, and the lower layer 12 as the decorative layer. The decorative layer 12 typically does not possess the necessary airflow resistance for the desired effect according to the invention. Furthermore, in this embodiment, the decorative layer 12 itself has insufficient inherent stability. Therefore, if the decorative layer 12 were used alone as the roller blind 2, it would sag excessively and / or form creases, and / or would not be able to provide the required tension for the roller blind 2. For these reasons, the additional support layer 10 is provided, which is also referred to as a cover fleece, carrier fleece, carrier film, or fabric carrier. However, it is also possible, in principle, to provide the two layers 10 and 12 as "equal" layers, provided the decorative material has sufficient airflow resistance and / or stiffness.

[0026] The two layers 10 and 12 are bonded together by an adhesive layer 14. The adhesive layer 14 consists, for example, of a polyethylene powder (PE) or a woven nonwoven fabric. Besides bonding the two layers 10 and 12, the adhesive layer 14 also serves to adjust the airflow resistance, as the amount of adhesive used affects the air permeability. Too much adhesive can result in a roller blind 2 with very high airflow resistance, while too little adhesive may lead to excessive porosity and bonding problems between the two layers 10 and 12. In the present embodiment, the three components 10, 12, and 14 are coordinated to achieve the desired airflow resistance of the roller blind 2, i.e., of the entire system.

[0027] Both the air-permeable layer 10 and the decorative layer 12 can be perforated or porous.

[0028] In summary, the invention can be described as follows: A motor vehicle with a roof opening that can be closed by a sunroof panel 4 or the like has a roller blind 2 in the area of ​​the roof opening. According to the invention, the roller blind 2 has a defined air permeability, i.e., a defined flow resistance. The roller blind 2, together with the air space L below the closed sunroof panel, forms a highly effective sound absorption system. For this purpose, the roller blind 2 has a flow resistance of approximately 500 Pa·s / m to approximately 2,500 Pa·s / m.

Claims

[1] Motor vehicle with a roller shutter track which is arranged in the area below a lockable roof opening of the motor vehicle and can be moved parallel to the direction of travel of the motor vehicle, characterized by , that the roller blind is designed to be air-permeable and has a flow resistance of more than 500 Pa·s / m and less than 2,500 Pa·s / m, such that the roller blind (2) together with the air volume (L) between the closed roof opening and the roller blind (2) forms an airborne sound absorption system. [2] Motor vehicle according to claim 1, characterized by , that the flow resistance of the roller shutter track (2) is more than 750 Pa·s / m and less than 1,500 Pa·s / m. [3] Motor vehicle according to claim 1 or 2, characterized by , that the roller blind (2) has an air-permeable layer (10). [4] Motor vehicle according to claim 3, characterized by , that the air-permeable membrane (10) is formed from a textile material and / or a plastic film. [5] Motor vehicle according to claim 1 or 2, characterized by , that the roller blind (2) has an airtight layer (10) made of an airtight material which is provided with a perforation. [6] Motor vehicle according to claim 5, characterized by , that the airtight layer (10) is formed from a textile material and / or a plastic film. [7] Motor vehicle according to any of the preceding claims, characterized by , that the roller blind (2) is made in a single layer. [8] Motor vehicle according to any one of claims 1 to 6, characterized by , that the roller blind (2) is made in multiple layers. [9] Motor vehicle according to any of the preceding claims, characterized by , that the roller blind (2) has a cover layer (10) on the upper side and a decorative layer (12) on the lower side. [10] Motor vehicle according to any of the preceding claims, characterized by , that the roller blind (2) is opaque.

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