Structure for mounting an electrodynamic transducer in an interior compartment of a vehicle - Patents.com

Abstract

The present disclosure relates to a structure (1) for mounting electrodynamic transducers in an interior compartment of a vehicle, said structure comprising a plate (6) having a vibrating structure, one or more electrodynamic transducers (3) mounted under said plate, a decoupling frame (4) of increasing stiffness, a vehicle floor pan (2), a rigid support frame (7) for receiving said decoupling frame between said decoupling frame and said floor pan, a number of legs (8) for the base of said support frame defining a main cavity (9), a porous decoupling and absorbing layer (10), and an adjacent cavity (11) extending around said legs and communicating with said main cavity through the space (12) between said legs.

Description

Detailed Description of the Invention

[0001] The present disclosure relates to a structure for mounting an electrodynamic transducer in an interior compartment of a vehicle.

[0002] Structures are known for mounting electrodynamic transducers in interior compartments of motor vehicles, such as passenger compartments or luggage compartments, the structures including, from above and below, 10 8 From 10 9 a plate having a Young's modulus between 100 and 150 Pa and a vibrating structure; one or more electrodynamic transducers mounted beneath the plate capable of emitting sound signals, such as music, within a passenger compartment of the vehicle; a frame for decoupling the plate, the frame being made of an elastically compressible foam, the plate being peripherally fixed to the frame; a floor pan of the vehicle;

[0003] The use of diaphragm-mounted transducers instead of loudspeakers saves space and weight, especially inside the vehicle.

[0004] However, the structure described above: -Does not allow optimal transmission of low frequencies in the passenger compartment, -Does not provide good isolation from vehicle rolling noise. The aim of the present disclosure is to overcome these drawbacks.

[0005] For this purpose, the present disclosure proposes a structure for mounting an electrodynamic transducer in an interior compartment of a vehicle, said structure comprising, from above to below: 10 8 From 10 9 a plate having a Young's modulus between 100 and 150 Pa and a vibrating structure; one or more electrodynamic transducers mounted beneath the plate; a frame for decoupling said plate, said frame being formed from a resiliently compressible foam, said plate being peripherally fixed to said frame; a floor pan of the vehicle; The structure comprises: the decoupling frame having an increasing stiffness away from the plate; The decoupling frame and the floor pan are continuously interposed from top to bottom, A rigid holding frame for receiving the decoupling frame, 8 From 10 9 said holding frame having a Young's modulus of 1 Pa; A plurality of legs for the base of the holding frame, 5 From 10 6 the legs having a Young's modulus between 100 and 150 Pa, the legs and the frame defining a main cavity extending below the plate; a porous decoupling and absorbent layer for receiving the legs, the layer being elastically compressible and open-porous; 4 From 10 5 said layer having a Young's modulus between 1 Pa and 2 Pa; an adjacent cavity extending around the legs and communicating with the main cavity through a space between the legs to define an extension cavity.

[0006] As used herein, terms used for positioning in space (top, bottom, above, vertical, below, above, etc.) are intended to refer to the structure at a given position within the vehicle.

[0007] In the proposed arrangement, The decoupling frame increases in stiffness as it moves away from the plate, holding the plate firmly in place while decoupling vertical vibrations at that point and dampening vibrations in other directions. The retaining frame acts as a reinforcement for the decoupling frame, helping to maintain the proper unstressed shape. The legs are able to support the decoupling frame while minimizing the transmission of vibrations to the floor pan. The open porous layer, combined with the air space contained in the main cavity between the plate and sheet, provides sound insulation against rolling noise according to the "double wall" principle, The presence of adjacent cavities allows the cavity to be expanded, and its large size makes it ideal for optimizing the reproduction of low frequencies.

[0008] Further features and advantages of the present disclosure will become apparent from the following description, taken in conjunction with the accompanying drawings. FIG. 1 is a schematic exploded perspective view of a portion of a structure according to one embodiment. FIG. 2 is a partial schematic view of a vertical cross section between two legs of the structure shown in FIG. 1 according to one embodiment.

[0009] With reference to the figures, a structure 1 for mounting an electrodynamic transducer in an interior compartment of a vehicle is described. The structure is arranged such that, from top to bottom, 10 8 From 10 9 a plate 6 having a Young's modulus between 0.01 Pa and a vibration structure; one or more electrodynamic transducers 3 mounted under said plate; a decoupling frame 4 for said plate, said decoupling frame 4 being made of elastically compressible foam, said plate being fixed to said frame near its periphery 5, for example by means of an adhesive; a pan 2 for the floor of the vehicle, The structure comprises: the decoupling frame has an increasing stiffness with increasing distance from the plate; The following are continuously interposed between the decoupling frame and the floor pan from top to bottom: A rigid holding frame (7) for receiving the decoupling frame, 8 From 10 9 the support frame having a Young's modulus between 1 Pa and 2 Pa; A number of feet 8 for the base of the holding frame, 5 From 10 6 said legs having a Young's modulus between 1000 and 1500 Pa, said legs and frame defining a main cavity (9) extending below said plate; A porous decoupling and absorbing layer 10 for receiving the legs, which is elastically compressible and open-porous, for example made of foam or felt, 4 From 10 5 said layer having a Young's modulus between 0.1 Pa and 0.2 Pa; and an adjacent cavity 11 extending around the legs and communicating with the main cavity through a space 12 between the legs to define an extension cavity.

[0010] According to various embodiments, the decoupling frame 4 can be formed from closed cell ethylene propylene diene monomer (EPDM) foam and / or open cell polyurethane foam.

[0011] According to the illustrated embodiment, the decoupling frame 4 has a discontinuously varying stiffness, said frame being made up of a number of decoupling frame elements 13 made of elastically compressible foam stacked together, said frame elements having a Young's modulus that increases with distance from the plate 6, said Young's modulus being 10 4 From 10 6 Between Pa.

[0012] According to an embodiment not shown, the decoupling frame 4 is integrally formed, said frame having a Young's modulus that increases continuously with distance from the plate 6, said Young's modulus being 10 4 From 10 6 Between Pa.

[0013] Such a change in Young's modulus can be achieved, for example, by increasing the density of the material making up the decoupling frame 4 moving away from the plate 6 .

[0014] According to another embodiment, not shown, the decoupling frame 4 is integrally formed, said frame having a material recess in the upper part of its thickness in order to reduce its stiffness (and thus reduce its apparent Young's modulus).

[0015] According to one embodiment, the recess may be formed by a hole provided in the upper part of the thickness of the decoupling frame 4, said hole opening into the upper face of said frame.

[0016] According to a further embodiment, the upper surface of the decoupling frame 4 has protrusions formed from the material of the frame, the recesses being formed by the spaces between the protrusions.

[0017] According to one embodiment, the leg 8 has a relative normal compressive stress-strain characteristic CC 2 measured according to the ISO 3386 / 2 standard in force at the filing date of this application. 40 and is greater than 10 kPa.

[0018] According to the embodiment shown, the legs 8 are associated near their upper ends with a support frame 14 , in particular made from the same material as said legs, said support frame receiving the holding frame 7 .

[0019] In particular, the legs 8 and the support frame 14 may be formed integrally.

[0020] In one embodiment, the legs 8 have open porosity to achieve sound absorption.

[0021] In one embodiment, legs 8 are based on resiliently compressible foam flakes bonded together by bicomponent fibers comprising a high temperature meltable core and a low temperature meltable sheath, the flakes being bonded together by melting the sheath.

[0022] The advantages of such materials are their high load-bearing capacity (static compressibility at large deformations) and low Young's modulus at small deformations.

[0023] Bicomponent fibers, for example, include a core of polyethylene terephthalate (PET) and a sheath of polyethylene terephthalate modified to lower its melting point.

[0024] As shown in Figure 2, the adjacent cavity 11 comprises a space 22 located between a mat 15 covering the vehicle floor and a pan 2, said mat being spaced from said pan by spacer means 16 which is decoupled from said pan by decoupling means 17.

[0025] As shown in FIG. 2, the mat 15 is more stretched than the plate 6 .

[0026] According to a variant not shown, the mat 15 can be cut along the periphery of the plate 6 so that no bond occurs between the plate and the part of the mat surrounding it.

[0027] Optionally, a sheet of flexible material such as nonwoven fabric can be placed in the cutout to ensure visual continuity with the mat 15 .

[0028] According to the embodiment shown, the mat 15 rests on a substrate 18 comprising a layer 19 of compressible foam and a tray 20 formed from moulded plastic material for receiving said layer, said tray being provided with moulded legs 21 forming the spacing means 16, adjacent cavities 11 defining spaces 22 extending between said legs.

[0029] According to the embodiment shown, the decoupling means 17 consists of a porous layer 10 extending into the adjacent cavity 11, the feet 21 being arranged on said layer.

[0030] In one embodiment, the plate 6 is positioned under the seat so that it is not pushed down by the passenger's legs. [Brief description of the drawings]

[0031] [Figure 1] FIG. 2 is a schematic exploded perspective view of a portion of a structure according to one embodiment. [Diagram 2] FIG. 2 is a partial schematic view of a vertical cross section between two legs of the structure shown in FIG. 1 according to one embodiment.

Claims

1. A structure (1) for mounting an electrodynamic transducer in an interior compartment of a vehicle, comprising: The structure is, from above to below, 10 ８ From 10 ９ a plate (6) having a Young's modulus between 1000 and 10000 Pa and a vibration structure; one or more electrodynamic transducers (3) mounted beneath said plate; a decoupling frame (4) for said plate, said decoupling frame (4) being made of resiliently compressible foam, said plate being attached to said frame near its periphery (5); a floor pan (2) of the vehicle; The structure comprises: the decoupling frame having an increasing stiffness away from the plate; The following are continuously interposed between the decoupling frame and the floor pan from top to bottom: A rigid holding frame (7) for receiving the decoupling frame, ８ From 10 ９ said holding frame having a Young's modulus between 100 and 200 Pa; A number of legs (8) for the base of the holding frame, ５ From 10 ６ said legs having a Young's modulus between 0.25 and 0.5 Pa, said legs and frame defining a main cavity (9) extending below said plate; A porous decoupling and absorbing layer (10) for receiving said legs, said layer being elastically compressible and open-porous; ４ From 10 ５ the layer having a Young's modulus between 0.01 Pa and 0.1 Pa; an adjacent cavity (11) extending around said legs and communicating with said main cavity through a space (12) between said legs to define an extension cavity; The structure further comprising:

2. The decoupling frame (4) has a discontinuously varying stiffness; The frame comprises a plurality of decoupling frame elements (13) of resiliently compressible foam stacked on top of one another; The Young's modulus of the frame elements increases with distance from the plate (6); The Young's modulus is 10 ４ From 10 ６ 2. The structure of claim 1, wherein the surface area is between 100 and 200 mm.

3. The decoupling frame (4) is integrally formed, the frame has a Young's modulus that increases continuously with distance from the plate (6); The Young's modulus is 10 ４ From 10 ６ 2. The structure of claim 1, wherein the surface area is between 100 and 200 mm.

4. The decoupling frame (4) is integrally formed, 2. The structure of claim 1, wherein the frame has a material recess in the upper portion of its thickness.

5. The leg (8) has a relative normal compressive stress-strain characteristic (CC) of greater than 10 kPa, measured according to the ISO 3386 / 2 standard. ４０ 10. A structure according to any of the preceding claims, characterized in that it comprises

6. A structure according to any of the preceding claims, characterized in that said legs (8) are associated near their upper ends with a support frame (14) which receives said holding frame (7).

7. A structure according to any of the preceding claims, characterized in that the legs (8) have open porosity so as to achieve sound absorption.

8. The legs (8) are based on elastically compressible foam flakes bound by bicomponent fibers comprising a high-temperature meltable core and a low-temperature meltable sheath; 10. A structure according to any of the preceding claims, characterised in that the bonding between the flakes is achieved by melting the sheath.

9. The adjacent cavity (11) comprises a space (22) located between a mat (15) covering the vehicle floor and the pan (2); A structure according to any of the preceding claims, characterised in that the mat is spaced from the sheet by spacer means (16) decoupled from the pan by decoupling means (17).

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