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EP-4735304-A1 - STRUCTURE OF A MOTOR VEHICLE COMPRISING AN ACOUSTIC DEVICE

EP4735304A1EP 4735304 A1EP4735304 A1EP 4735304A1EP-4735304-A1

Abstract

The invention relates to a structure of a motor vehicle, in particular of an electric vehicle, and to a mounting method. The structure comprises a floor part, in which a housing (28) is provided, and an acoustic device installed in said housing, said housing having a bottom wall (36) and two vertical walls (38, 40) facing each other. Said housing (28) comprises first anchoring members (46, 52, 54) secured to said bottom wall and second anchoring members (56) secured to the other wall (40). Said acoustic device comprises a casing (62) having a lower wall (68) and two opposite ends (64, 66), said casing comprising, on the one hand, first connecting members (80) located in said lower wall (68) so as to be able to cooperate with said first anchoring members (46, 52, 54), and, on the other hand, second connecting members (82) located in the other (66) of said ends so as to be able to cooperate with said second anchoring members (56).

Inventors

  • LAUDILLAY, Denis
  • MURUGESAN, Petchimani

Assignees

  • Renault s.a.s

Dates

Publication Date
20260506
Application Date
20240620

Claims (10)

  1. [Claim 1] Structure of a motor vehicle, in particular an electric vehicle, comprising a floor portion in which a housing (28) is provided, and an acoustic device installed in said housing, said housing having a bottom wall (36) and two walls (38, 40) erected opposite one another relative to said bottom wall (36), said acoustic device being adapted to reproduce the low sound frequencies of the audio spectrum; characterized in that said housing (28) comprises first anchoring members (46, 52, 54) secured to said bottom wall in the vicinity of one (38) of said two walls (38, 40) and second anchoring members (56) secured to the other (40) of said two walls; and in that said acoustic device comprises a box (62) defining a resonance chamber and having a lower wall (68) and two opposite ends (64, 66), said box comprising on the one hand first connecting members (80) located in said lower wall (68) in the vicinity of one (64) of said ends to be able to cooperate with said first anchoring members (46, 52, 54) of said housing and on the other hand, second connecting members (82) located in the other (66) of said ends to be able to cooperate with said second anchoring members (56).
  2. [Claim 2] Floor structure according to claim 1, characterized in that said housing (28) has two other walls (42, 44) erected opposite one another relative to said bottom wall (36) and respectively joining said two walls (38, 40) substantially perpendicularly.
  3. [Claim 3] Floor structure according to claim 1 or 2, characterized in that said box (62) is equipped with an electroacoustic transducer (74).
  4. [Claim 4] Floor structure according to any one of claims 1 to 3, characterized in that said first anchoring members comprise at least one stud (52, 54) extending substantially perpendicularly from said bottom wall (36).
  5. [Claim 5] Floor structure according to any one of claims 1 to 4, characterized in that said first anchoring members comprise a U-shaped profile section (46) having two opposite wings (48, 50) secured to said bottom wall (36) and a bottom (45) extending at a distance from said bottom wall to receive said box (62) in support.
  6. [Claim 6] Floor structure according to any one of claims 1 to 5, characterized in that said second anchoring members comprise a right-angled part (56) having a free projecting part (58) receiving a threaded part.
  7. [Claim 7] Floor structure according to any one of claims 1 to 6, characterized in that said box (62) has an upper wall (70) opposite said lower wall (68) and an external surface (72); and in that said upper wall (70) has at least one zone (76, 78) in which the external surface (72) extends in a chimney to said first connecting members (80) of said lower wall (68).
  8. [Claim 8] Floor structure according to any one of claims 1 to 7, characterized in that said first connecting members have at least one wall portion and an orifice made in said wall portion.
  9. [Claim 9] Floor structure according to any one of claims 1 to 8, characterized in that said box (62) is further equipped with an amplifier (74).
  10. [Claim 10] Method of producing a structure of a motor vehicle, in particular an electric vehicle, comprising the following steps: - a floor portion of the motor vehicle, in particular the electric vehicle, is provided in which a housing (28) is provided having a bottom wall (36) and two walls (38, 40) facing each other relative to said bottom wall, said housing (28) comprising first anchoring members (46, 52, 54) secured to said bottom wall (36) in the vicinity of one (38) of said two walls (38, 40) and second anchoring members (56) secured to the other (40) of said two walls; - an acoustic device is provided that is suitable for reproducing the low sound frequencies of the audio spectrum, said acoustic device comprising a box (62) defining a resonance chamber and having a lower wall (68) and two opposite ends (64, 66), said box comprising on the one hand first connecting members (80) located in said lower wall (68) in the vicinity of one (64) of said ends and on the other hand, second connecting members (82) located in the other (66) of said ends; and, - said acoustic device is installed in said housing (28) so that said first connecting members (80) and said first anchoring members (46, 52, 54) of said housing on the one hand, and said second connecting members (82) and said second anchoring members (56) on the other hand, cooperate respectively with each other.

Description

Title of the invention: Structure of a motor vehicle comprising an acoustic device The present invention relates to a structure of a motor vehicle equipped with an acoustic device. More particularly, the invention aims at the implementation of an acoustic device adapted to reproduce the low frequencies of the audio spectrum, inside a motor vehicle. Such a device is also called: “subwoofer”. Indeed, the reproduction of sound in the different components of the sound spectrum requires means with different, even antagonistic, characteristics. This is particularly the case with the use of specific transducers for the reproduction of the lowest frequencies of the spectrum, thus corresponding to the lowest sounds. It is known to install subwoofers in the rear of motor vehicles, in the trunk, for thermal and space reasons. Indeed, the subwoofer comprises a box, which defines a resonance chamber of a certain volume and a loudspeaker installed on a wall of the box, as well as an amplifier usually mounted on said wall near the loudspeaker. Now, the amplifier generates thermal energy that needs to be dissipated. And the trunk of the motor vehicle is the place where this thermal energy is easiest to dissipate. However, the dimensions of the trunks of motor vehicles, particularly electric vehicles, tend to shrink, not only for the benefit of passengers, but also for the storage batteries. Such a development then makes the implementation of subwoofers more complex. Furthermore, the trunk of motor vehicles is connected to their passenger compartment and the storage batteries present risks of potentially toxic gas emissions. Therefore, it is also necessary to protect passengers from these fumes. Also, a problem which arises and which the present invention aims to solve is to provide a structure of a motor vehicle, in particular an electric vehicle, allowing the implementation of a subwoofer in complete safety for the passengers and, moreover, without compromising the trunk volume. In order to solve this problem, and according to a first object, a structure of a motor vehicle, in particular an electric vehicle, is proposed, comprising a floor portion in which a housing is provided, and an acoustic device installed in said housing, said housing having a bottom wall and two walls erected opposite one another relative to said bottom wall, said acoustic device being adapted to reproduce the low sound frequencies of the audio spectrum. Said housing comprises first anchoring members secured to said bottom wall in the vicinity of one of said two walls and second anchoring members secured to the other of said two walls. And said acoustic device comprises a box defining a resonance chamber and having a lower wall and two opposite ends, said box comprising on the one hand first connecting members located in said lower wall in the vicinity of one of said ends to be able to cooperate with said first anchoring members of said housing and on the other hand, second connecting members located in the other of said ends to be able to cooperate with said second anchoring members. Thus, a feature of the invention lies in the implementation of anchoring members on the bottom wall and on the other of said two walls while preserving the integrity of the walls. In other words, the anchoring members make it possible to avoid making holes in these walls. Consequently, the walls are sealed from the outside and in particular from the storage battery which extends under the floor of the motor vehicle. Also, said housing preferably has two other walls erected opposite one another relative to said bottom wall and respectively joining said two walls substantially perpendicularly. As a result, the housing, open in its upper part towards the passenger compartment, is watertight with respect to the exterior of the vehicle. Therefore, any toxic gas emissions from the storage battery do not pass through the floor of the motor vehicle. Preferably, the housing is provided in the part of the floor corresponding to the trunk of the motor vehicle. In addition, the box is formed from a single piece comprising first connecting members and second connecting members adapted to cooperate respectively with the first anchoring members and the second anchoring members so as to be able to easily maintain the box in a fixed position. Also, as will be explained in more detail in the remainder of the description, such elements allow easier and faster fixing of the box in the housing provided for this purpose. In addition, the box is advantageously equipped with an electroacoustic transducer. This transducer is intended to reproduce the lowest frequencies of the audio spectrum. As will be explained in more detail below, the electroacoustic transducer is pre-installed on a wall of the box before being mounted in the housing. According to a particularly advantageous embodiment of the invention, said first anchoring members comprise at least one stud extending substantially perpe