EP1630404A2 - Device for transmitting sound in a vehicle - Google Patents

Abstract

The device has a housing with a partition wall, and two separate partition space bounded by the housing and wall. A covering flap (6) is penetrated by the wall and rotates around a swivel axis. A flexible and partly broken sealing unit (8) that is arranged in a gap between a circulating edge of the flap and the housing is parallel to the axis. The unit has through holes that are arranged in the area of longitudinal edges of the flap.

Description

The invention relates to a device for transmitting noise in a motor vehicle having the features according to the preamble of claim 1.

Modern motor vehicles have very quiet internal combustion engines as drive motors whose operating noise in the interior of the vehicle is barely perceptible. The operating noise of the internal combustion engine is drowned out under certain circumstances by secondary noises of the rolling wheels, an activated ventilation or the like. Under certain circumstances, it may be desirable to audibly transmit the operating noise of the drive motor into the interior of the motor vehicle.

From EP 1 306 829 A2 an apparatus for the transmission of engine noise is known in which a housing with a partition wall delimits two separate subspaces. The partition is broken by a hinged flap, which divides the two subspaces. The first subspace is connected to the intake manifold of the internal combustion engine, while the second subspace to a wall of the Vehicle or directly into the interior is guided. In the first subspace, sound pressure oscillations in the intake pipe act on the half of the transmission flap projecting there, which is excited to pivot. In the second subspace, the oscillating pivotal movement of the transfer flap leads to a sound transmission to the vehicle interior.

In one embodiment of said arrangement, a gap is provided between a peripheral edge of the transfer flap and the housing, which serves to compensate for static pressure differences. The gap must due to production have a certain width, which adversely affects the noise transmission behavior. In an alternative embodiment, the gap is widened and filled with a circumferential sealing frame. The circumferential sealing frame can exert a desired damping effect on the pivotal movement of the flap. The sealing effect improves the noise transmission behavior. The membrane-like sealing frame is subject to high loads due to pressure differences, especially when operating with supercharged internal combustion engines.

The invention has the object of providing a device of the type mentioned in such a way that a good noise transmission is given at a low component load.

This object is achieved by a device for noise transmission with the features of claim 1.

It is proposed a device for transmitting noise in a motor vehicle, in which a resilient and at least partially open-ended sealing element is arranged in a gap between a peripheral edge of the transmission flap and the housing. The gap may have a certain width, which is bridged by the sealing element. The openings in the sealing element allow a static pressure equalization on both sides of the transmission flap, whereby the static load on the transmission flap and in particular of the sealing element is reduced. At the same time, the gap is substantially sealed with respect to dynamic, noise-induced pressure fluctuations, as a result of which the sound energy is converted, at least approximately loss-free, into a dynamically vibrating pivoting movement of the transmission flap. Due to the elastic material properties of the sealing element position and shape tolerances in the gap region between the transfer flap and the housing can be compensated. There are only small demands made on the manufacturing tolerances.

In an advantageous embodiment, apertures of the sealing element are arranged in the region of longitudinal edges of the transmission flap adjoining the pivot axis, while the sealing element in the region of the end edges running transversely to the longitudinal edges and the pivot axis is designed as a continuous membrane. At the end edges of the membrane-like sealing element is essentially one-dimensionally loaded on bending. This load can be absorbed by the membrane even at high amplitudes without risk of damage. In addition to the sealing function, the membrane also performs the function of a vibration damper to avoid unwanted resonance vibrations of the transmission flap. At the same time allow the openings on the longitudinal edges of a static pressure equalization, which limits the stress of the frontal membrane to dynamic vibration loads. The openings can be designed in the form of a gap between the sealing element and the transfer flap or as a slot in the sealing element. The width of the gap may advantageously be greater than or equal to zero in the neutral position of the transfer flap. In a mutual contact of the adjacent gap walls in the neutral position of the flap with or without bias results in a damping friction effect, while the gap opens at deflected position of the transfer flap and causes a static pressure compensation.

In an expedient embodiment, openings are provided in particular rounded corner regions of the transfer flap. A spatially multi-dimensional deformation of the sealing element with a correspondingly high voltage level in this area is avoided.

The sealing element expediently has an elastically deformable bead outside the perforations in a region in the form of a continuous membrane. By the bead, the rigidity of the sealing element is reduced. A free oscillating movement of the transfer flap is hardly affected, the sealing function is completely preserved. The bead allows high degrees of deformation of the sealing element and thus high movement amplitudes of the transfer valve without overstressing the sealing material.

In a preferred variant, a circumferential residual gap is formed along the peripheral edge. The elastic sealing element seals the circumferential gap largely, but not completely and can compensate for positional tolerances. The circumferential residual gap avoids unwanted friction and allows for a certain pressure equalization or air exchange.

In an advantageous embodiment, the transfer flap is pivotally held at its longitudinal edges in the region of the pivot axis by means of two elastically rotatable stub axles. The stub axle are expediently made in one piece with the sealing element, wherein the transmission flap is held in particular form-fitting manner to the axle stubs. The pivotal mounting of the transmission flap results from the torsional elastic deformability of the stub axle. Additional devices for the pivotable mounting of the transfer flap can be dispensed with. At the same time, the elastic axle stub also act as a sealing element, as a result of which undesired leakages in the axle area are avoided.

The transfer flap expediently has a web along its pivot axis, on which a resilient sealing strip lying between the transfer flap and the dividing wall rests. The elastic sealing strip can be made comparatively narrow in cross section. This results in a narrow, sealing support line of the sealing strip a comparatively high surface pressure. In conjunction with the absence of a static pressure differential, a reliable seal is provided, while the pivotal movement of the transfer flap due to the low cross-sectional stiffness of the narrow sealing strip is substantially unimpaired.

The web of the transfer flap is held in particular between the elastic stub axles and forms together with the stub axles a continuous axle. The sealing strip can rest continuously on the web and on the axle stubs, whereby a good seal is also given in the corner areas or in the area of the stub axle.

Fig. 1

eine schematische Längsschnittdarstellung einer Vorrichtung zur Geräuschübertragung nach dem Stand der Technik;

Fig. 2

in einer perspektivischen Schnittdarstellung ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung zur Geräuschübertragung mit einer um die Übertragungsklappe umlaufenden, teilweise durchbrochenen Dichtmembran;

Fig. 3

in einer perspektivischen Übersichtsdarstellung die Baugruppe aus Übertragungsklappe und Membran nach Fig. 2;

Fig. 4

eine geschnittene Darstellung der Anordnung nach Fig. 3 mit Einzelheiten zu stirnseitigen Membransicken mit angrenzenden Durchbrechungen;

Fig. 5

eine Schnittdarstellung einer Variante der Anordnung nach Fig. 2 mit einem rahmenförmigen Dichtelement;

Fig. 6

eine perspektivische Übersichtsdarstellung der Baugruppe aus dem Rahmenelement und der Übertragungsklappe nach Fig. 5;

Fig. 7

die vergrößerte Einzelheit VII nach Fig. 6 mit dem formschlüssig in Achsstummeln gehaltenen Steg;

Fig. 8

eine Draufsicht der Anordnung nach Fig. 6;

Fig. 9

eine Querschnittsdarstellung der Baugruppe nach Fig. 8 entlang der dort gezeigten Linie IX-IX mit Einzelheiten der Verbindung zwischen dem Steg und den Achsstummeln;

Fig. 10

eine Längsschnittdarstellung der Baugruppe nach Fig. 8;

Fig. 11

eine vergrößerte Darstellung der Einzelheit XI nach Fig. 10 mit einer spaltförmigen Durchbrechung am Dichtelement.

Embodiments of the invention are described in more detail below with reference to the drawing. Show it:

Fig. 1

a schematic longitudinal sectional view of a device for noise transmission according to the prior art;

Fig. 2

in a perspective sectional view of an embodiment of the device according to the invention for noise transmission with a circulating around the transfer flap, partially perforated sealing membrane;

Fig. 3

in a perspective overview of the assembly of transmission flap and membrane of FIG. 2;

Fig. 4

a sectional view of the arrangement of Figure 3 with details to front side membrane beads with adjacent openings.

Fig. 5

a sectional view of a variant of the arrangement of Figure 2 with a frame-shaped sealing element.

Fig. 6

an oversized perspective view of the assembly of the frame member and the transfer flap of FIG. 5;

Fig. 7

the enlarged detail VII of Figure 6 with the form-fitting held in stub axles web.

Fig. 8

a plan view of the arrangement of FIG. 6;

Fig. 9

a cross-sectional view of the assembly of Figure 8 along the line IX-IX shown there with details of the connection between the web and the stub axles.

Fig. 10

a longitudinal sectional view of the assembly of FIG. 8;

Fig. 11

an enlarged view of the detail XI of FIG. 10 with a gap-shaped opening on the sealing element.

Fig. 1 shows a sectional view of a device for transmitting noise in a motor vehicle according to the prior art. The device comprises a housing 1 with an inner partition wall 2, wherein the housing 1 and the inner partition wall 2 define two separate subspaces 3, 4. A part of the housing 1 is formed on an intake pipe 17 of an internal combustion engine, not shown, of a motor vehicle, wherein the first compartment 3 is connected sound pressure transmitting with the interior of the intake pipe 17. The second subspace 4 is fluidly separated from the first subspace 3 by means of the partition wall 2.

There is a transmission flap 6 is provided which breaks through the partition wall 2 and which is pivotally mounted about a pivot axis 5 located in the partition 2. The transmission flap 6 extends on both sides of the pivot axis 5 to form a small gap to close to the inner wall of the housing 1 and divides the two subspaces 3, 4 in respective individual rooms 3 ', 3 ", 4', 4" on. The individual space 4 "of the subspace 4 is connected by means of an outlet 19 sound pressure transmitting with a wall of the interior of the motor vehicle, not shown, or directly to the interior.

The transfer flap 6 is shown in its neutral position, starting from which it can perform an oscillating pivoting movement in the direction of a double arrow 28. The swivel range is about 10 °. The static pressure in the intake pipe 17 acts on both sides via the gap between the transfer flap 6 and the housing 1 in the first subspace 3 on the transfer flap 6 and thus has no effect on the deflection. An oscillating sound pressure in the intake pipe 17 acts in the direction of an arrow 18 on the transfer valve 6, without being able to penetrate the narrow gap to a significant degree. As a result of the applied oscillating sound pressure, the transfer flap 6 is set in vibration. The oscillating transfer flap 6 causes in the second subspace 4, the generation of a like-like, offset by 180 ° sound pressure in the individual room 4 ", which is made audible by means of the outlet 19 in the interior of the motor vehicle.

The transfer flap 6 is mounted fluidically tight in the partition wall 2. As a result of the sealing of the two subspaces 3, 4 against each other in conjunction with the gap between the transfer flap 6 and the housing 1, the arrangement acts independently of the static pressure in the intake pipe 17 and is thus in particular for the operation of a supercharged drive motor, for example in a Saugrohrbereich between a turbocharger and the engine suitable.

2, an embodiment of the device according to the invention is provided, the basic principle is explained with reference to the arrangement of FIG. 1, according to which the housing 1 consists of two housing halves 20, 21, which are bolted together on a flange 22. In this case, a membrane 27 is sealingly held in the flange 22. The partition wall 2 is integrally formed on the two housing halves 20, 21.

After the cut perspective view of FIG. 2, the pivotally mounted about the pivot axis 5 transmission flap 6 has a circumferential edge 7, between which and the inner wall of the housing 1, a gap 25 is formed. At two opposite end edges 11 of the transfer flap 6, the gap 25 is widened and bridged by means of the membrane 27. Along the longitudinal edges 10 running perpendicular to the pivot axis 5, the gap 25 is made comparatively narrow and also bridged by the membrane 27. The circumferential diaphragm 27 forms a circumferential sealing element 8 which has slot-shaped apertures 9, which are described in more detail in connection with FIG. 3, in the region of the longitudinal edges 10 adjoining the pivot axis 5. In the region of the transversely to the longitudinal edges 10 and parallel to the pivot axis 5 extending end edges 11 of the transfer flap 6, the membrane 27 is designed to be consistently pressure-tight and provided with a bead 13.

Fig. 3 shows in a perspective view of the assembly consisting of the transfer flap 6 and the membrane 27 of FIG. 2. It can be clearly seen that the membrane 27 is designed in its base larger than the transfer flap 6. It has unspecified screw holes for clamping attachment between the two housing halves 20, 21 in the flange 22 (FIG. 2).

The membrane 27 is performed as shown in FIG. 4 as a continuous, substantially planar component, which is connected to the transfer flap 6 surface. The illustration of FIG. 3 it can be seen that the membrane 27 with the beads 13th sealingly adjacent to the parallel to the pivot axis 5 extending end edges 11. In rounded corner regions 12 of the transfer flap 6, the membrane 27 is broken. The corresponding apertures 9 continue from the rounded corner regions 12 along the longitudinal edges 10 to near the pivot axis 5.

In the illustrated, not deflected position of the transfer flap 6, the openings 9 are opened in the rounded corner regions 12, as can be seen particularly clearly in the illustration of FIG. In the region of the longitudinal edges 10, the apertures 9 are formed by a slit-shaped section in the membrane 27, wherein the section is substantially closed in an unloaded rest position due to the elastic forces of the rubbery membrane 27. Only when applying an external pressure difference or as a result of a pivoting deflection of the transfer flap 6, this slit-shaped opening opens. 9

The sectional view of FIG. 5 shows a variant of the arrangement according to FIGS. 2 to 4, according to which the transfer flap 6 is held along its peripheral edge 7 in a likewise encircling rubber-elastic frame 26. The frame 26 has an internal groove in which the transfer flap 6 is held in a form-fitting manner. In the outer region, the frame 26 is fastened in a form-fitting manner in the flange 22 between the two housing halves 20, 21. The two housing halves 20, 21 are screwed together at screw holes 29 of the flange 22 and thereby hold the frame 26. The frame 26th forms the sealing element 8 between the peripheral edge 7 of the transmission flap 6 and the inner wall of the housing first

The two halves of the partition wall 2 are at their ends facing each other at a distance from the transfer flap 6 and each have a groove 23 in this area. In the grooves 23 each have a sealing strip 16 is held, which lie flat and sealing against the transfer flap 6 in the region of the pivot axis 5. The elastic design of the peripheral sealing element 8 and the sealing strips 16 allows a pivoting movement of the transfer flap 6 about the pivot axis 5 in the direction of the double arrow 28. In the other features and reference numerals, the arrangement of FIG. 5 is consistent with the arrangement of FIG.

Fig. 6 shows in a perspective view of the assembly consisting of the transfer flap 6 and the frame 26 of FIG. 5. In the region of the pivot axis 5, which consists of a rubber elastic material frame 26 inwardly projecting, integrally formed and of the same elastic material A stub axle 14, in which the transmission flap 6 is pivotally supported and stored. Along the pivot axis 5, a continuous web 15 is provided on the transmission flap 6, which merges flush into the two stub axles 14. The web 15 forms together with the two stub axles 14 in the direction of the pivot axis 5 continuous axle member 31st

In Fig. 7, the detail VII is shown in Fig. 6 enlarged, therefore, the web 15 by means of a corresponding Forming engages in a connecting portion 30 in the adjacent stub axle 14. The transfer flap 6 is thus held in a form-fitting manner with the web 15 on the two axle stubs 14. The illustration in Fig. 7 it can be seen that the web 15 together with the adjacent stub axle 14 have a common plane and continuous surface on which the sealing strip 16 (Fig. 5) sealingly rests.

8 shows a plan view of the arrangement according to FIG. 6, according to which the transfer flap 6 has a substantially rectangular cross-section with rounded corner regions 12. The elastic frame 26 encloses the transfer flap 6 completely and forms the sealing element 8. Along the peripheral edge 7 of the transfer flap 6, a circumferential residual gap 32 is formed, which is indicated here only as a solid line and shown in more detail in Fig. 11. The two stub axles 14 protrude from the frame 26 inwards and partially overlap the transmission flap 6 along the pivot axis 5. The illustration can also be seen that the web 15 merges flush in its contour in the two end faces adjacent stub axle 14.

9 shows a cross-sectional view of the arrangement according to FIG. 8 along the line IX-IX shown there. It can be seen that the web 15 at the two end-side connecting portions 30 each having an approximately semicircular projection which engages positively in corresponding recesses of the two stub axles 14.

FIG. 10 shows the arrangement according to FIG. 8 in a longitudinal section along the line X-X, according to which the web 15 protrudes on both sides over the surface of the transfer flap 6 and forms contact surfaces for the sealing strips 16 (FIG. 5) arranged on both sides. The region of the end edge 11 adjoining the frame 26 as a detail XI is shown enlarged in FIG. In the gap 25 between the end edge 11 of the transmission flap 6 and the housing 1 (FIG. 5), the sealing element is arranged in the form of the frame 26, wherein a residual gap 32 remains between the end edge 11 and the sealing element 8.

The residual gap 32 shown here by way of example for the end edge 11 in conjunction with the sealing element 8 and the frame 26 corresponds in its construction to the rounded corner regions 12 and the regions of the longitudinal edges 10. Considering the illustration according to FIG. 8, an identical construction is obtained along the entire circumferential edge 7 with the exception of the region of the connecting stub 14. It may also be expedient to carry out the residual gap in the different edge regions with a different width. The sealing element 8 can also rest against the edge or edges of the transfer flap 6 with or without prestressing.

Claims (11)

Device for transmitting noise in a motor vehicle, comprising a housing (1) with an inner partition wall (2), wherein the housing (1) and the inner partition (2) delimit two separate partial spaces (3, 4), both of which are provided by means of a the dividing wall (2) is divided, pivotable about a pivot axis (5) transmission flap (6) are divided, wherein the first compartment (3) connected to an intake pipe (17) of an internal combustion engine and the second compartment (4) with an interior of the motor vehicle sound transmitting has,
characterized in that in a gap (25) between a peripheral edge (7) of the transfer flap (6) and the housing (1), an elastic and at least partially open-ended sealing element (8) is arranged. Device according to claim 1,
characterized in that perforations (9) of the sealing element (8) in the region of the pivot axis (5) adjacent the longitudinal edges (10) of the transfer flap (6) are arranged, while the sealing element (8) in the region of their transverse to the longitudinal edges (10 ) and parallel to the pivot axis (5) extending end edges (11) is designed as a membrane (27) consistently tight. Apparatus according to claim 1 or 2,
characterized in that perforations (9) in particular rounded corner regions (12) of the transmission flap (6) are provided. Device according to one of claims 1 to 3,
characterized in that the openings (9) are designed slot-shaped. Device according to one of claims 1 to 4,
characterized in that the sealing element (8) has a resiliently deformable bead (13) away from the apertures (9) in a region in the form of a continuous membrane (27). Device according to claim 1,
characterized in that along the peripheral edge 7, a circumferential residual gap 32 is formed. Device according to one of claims 1 to 6,
characterized in that the transfer flap (6) at its longitudinal edges (10) in the region of the pivot axis (5) by means of two elastically rotatable stub axle (14) is pivotally held. Device according to claim 7,
characterized in that the stub axles (14) are made in one piece with the sealing element (8). Device according to claim 7 or 8,
characterized in that the transfer flap (6) is held positively against the axle stubs (14). Device according to one of claims 1 to 9,
characterized in that the transfer flap (6) along its pivot axis (5) has a web (15) on which a between the transfer flap (6) and the partition wall (2) lying resilient sealing strip (16) rests. Device according to claims 9 and 10,
characterized in that the web (15) is held between the axle stubs (14) and forms, together with the stub axles (14), a continuous axle element (31).

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