Speaker unit for a vehicle and assembly method

Abstract

The solution presented in the invention relates to a loudspeaker unit (E) for a vehicle, for example as part of a vehicle acoustic warning system, having a loudspeaker housing (1) and a loudspeaker (2) accommodated in an inner cavity (123) of the loudspeaker housing (1), wherein the loudspeaker housing (1) has a first housing wall (10) to which the loudspeaker (2) is fixed on the inner side facing the inner cavity (123). For example, the first housing wall (10) is provided to be air-permeable in order to transmit the sound generated by the loudspeaker (2) outwards into the ambient space surrounding the loudspeaker housing (1), for which purpose the first housing wall has a gas-permeable grid area (100) comprising a plurality of channels (1003) each in cross section Z-shaped or S-shaped for transmitting sound.

Description

[0001] manual

[0002] The solution proposed in this invention specifically relates to a speaker unit for vehicles. Such a speaker unit can, for example, be part of an Acoustic Vehicle Alerting System (AVAS).

[0003] Acoustic vehicle alarm systems are used, for example, in electric vehicles. In this case, one or more speaker units should generate a sound audible to people around the vehicle (especially pedestrians), the sound (specifically its frequency) varying according to the vehicle's speed, in order to acoustically alert people to the presence of the moving vehicle. In this scenario, when the vehicle is traveling at a speed below a threshold, such as 20 km / h or 30 km / h, the speakers in the speaker units output an audible sound with varying frequencies. Therefore, the corresponding speaker units must be located in the external area of ​​the vehicle so that the sound they generate is easily audible to people in the surrounding environment. This, in turn, places special demands on the design of the speaker housing, particularly to protect the speakers housed within the housing from environmental influences.

[0004] Furthermore, low-cost manufacturing is particularly important for speaker units designed for industrialized production and assembly. The compact packaging size of speaker units is also crucial for transportation to automakers.

[0005] In this context, the purpose of the solution proposed in this invention is to provide improvements for speaker units, particularly speaker units that can be used as part of an acoustic vehicle alarm system.

[0006] To achieve this objective, a speaker unit for a vehicle is proposed, having a speaker housing and a speaker housed within the cavity of the speaker housing. The speaker housing includes a first housing wall on the inner side of the first housing wall facing the cavity, wherein the speaker is fixed thereon, and the first housing wall has a permeable grille area for transmitting sound generated by the speaker outward. The grille area includes a plurality of (air) channels, each of which is Z-shaped or S-shaped in cross-section, for transmitting sound.

[0007] Through the Z-shaped or S-shaped channels in the cross-section of the grille area, air can flow between the inner cavity and the outer space, thus transmitting the sound produced by the speaker to the outside. Due to the Z-shaped or S-shaped channel cross-section design, the air in each channel undergoes at least two deflections. These deflections do not interfere with sound transmission. However, this also ensures that water jets directed towards the outside of the grille area do not directly penetrate the shell wall and impact the speaker located in the inner cavity behind the grille area. Therefore, the speaker is protected from powerful water jets through the appropriately designed grille area. Water sprayed onto the outside of the first shell wall can thus not impact the speaker unimpeded.

[0008] In this case, the channels, each with a Z-shaped or S-shaped cross-section, do not necessarily need to prevent liquid from entering the inner cavity through the grille area. Thus, the speaker arranged within the inner cavity can be directly implemented with a liquid-tight diaphragm for generating sound. However, even such a liquid-tight diaphragm is still sensitive to water jets impacting its surface under high pressure. The channels in the vented grille area, as designed, virtually eliminate the risk of damage to the speaker, particularly its diaphragm. Therefore, the corresponding speaker unit can be directly applied to the vehicle bumper area, even where strong water jets are expected to impact the housing (e.g., during vehicle washing).

[0009] In one implementation variation, the loudspeaker is positioned opposite the grille area of ​​the first housing wall within the cavity.

[0010] (Air) channels can be formed at least partially between the grille ribs in the grille region, these ribs also being constructed in a Z-shape or S-shape in cross-section. For example, in this case, it can be configured such that, in the cross-sectional view, the Z-shape or S-shape profile of adjacent grille ribs is rotated by 90° relative to the Z-shape or S-shape profile of the channel formed between adjacent grille ribs. The profiles of the grille ribs and the channels do not necessarily have to be identical in this case. Rather, in particular, the portions of the corresponding profiles can differ from each other, especially in width.

[0011] To improve liquid flow on the outer side of the first housing wall, the first housing wall may have a drainage channel. Such a drainage channel is, for example, distributed circumferentially on the outer side of the first housing wall. In this way, liquid impacting the outer side (particularly the grid area) can flow outward toward the housing edge into the drainage channel, and thus flow away from the outer side of the first housing wall. For example, the drainage channel has at least one discontinuity circumferentially through which liquid can flow from the drainage channel toward the second housing wall, the inner side of which is opposite the first housing wall in the inner cavity.

[0012] Another aspect of the solution proposed in this invention (which can be configured as an alternative or supplementary solution to having a grille region with a cross-section of a Z-shaped or S-shaped channel at the first housing wall of the speaker housing) is configured such that the speaker is fixed to the inner side of the first housing wall by a heat-riveting fixing part of the first housing wall.

[0013] In principle, it is conceivable to fix the speaker to the first housing wall using a separate fastener, such as at least one screw. However, thermal riveting allows for a relatively low-cost method of fixing the speaker to the first housing wall without the need for additional fasteners. This method of speaker fixing is particularly advantageous when the speaker housing or at least the first housing wall is made of plastic.

[0014] For example, the heat-riveting fixing part on the inner side of the first housing wall is constructed with bosses protruding into the inner cavity. Thus, each of these bosses can have a single post or pin protruding, which passes through a corresponding through-hole at the speaker when the speaker is mounted on the first housing wall. To secure the speaker to the first housing wall, the protruding pin or post is heat-riveted.

[0015] Regardless of how the speaker is fixed inside the first housing wall, the speaker can have at least one fixing edge with a through hole through which the speaker is fixed inside the first housing wall. Therefore, the corresponding through hole can be provided not only for heat-riveting fixing, but also, for example, for threaded connection, in which a screw passes through the through hole on the edge side and is screwed into the first housing wall.

[0016] Another aspect of the solution proposed in this invention relates to a loudspeaker unit, wherein a first housing wall of the loudspeaker housing (on the inner side of the first housing wall facing the inner cavity where the loudspeaker is fixed) is opposite to a second housing wall, and a circuit board connected to the loudspeaker is fixed at the second housing wall.

[0017] The speaker housing can be assembled relatively simply by fixing the speaker to one (first) housing wall and the circuit board to the opposite (second) housing wall. In this way, the speaker can be pre-mounted, for example, on the first housing wall, which is formed, for example, by a first housing component. The circuit board can thus be pre-mounted on the other (second) housing component, which is then connected to the first housing component. In this manner, for example, the circuit board can be installed into the first housing component, which already houses the speaker, without considerable effort. Instead, by connecting the two housing components that form different housing walls, the circuit board is arranged within the cavity of the speaker housing.

[0018] For example, a connector with at least one longitudinally extending rigid plug is provided on the circuit board, through which the speaker is connected to the circuit board. While it is theoretically possible to use a flexible cable between the circuit board and the speaker to electrically connect the two components of the speaker unit, the longitudinally extending rigid plug allows for easy insertion of the plug into the speaker, for example, when assembling the speaker unit, by mounting the (second) housing component forming the second housing wall to another (first) housing component where the speaker is already mounted.

[0019] To save space within the speaker housing cavity, the circuit board can be arranged at an angle relative to the extending planes containing the inner sides of the first and second housing walls. In this variant, the opposing inner sides of the first and second housing walls extend in mutually parallel extending planes. The circuit board is arranged at an angle relative to these extending planes within the cavity, and therefore not parallel to them. Consequently, the circuit board is oriented at an angle within the speaker housing cavity. This allows for a smaller cavity to accommodate the circuit board, through which the sound output from the speaker can be controlled.

[0020] The inclined arrangement of the circuit board is achieved, for example, by means of a second housing wall fixing part protruding inside the second housing wall, through which the circuit board is held inclined in the cavity relative to the extending plane.

[0021] For example, at least one fixing part of the second housing wall is constructed with a pin that is inserted into a through-hole of the circuit board. In this case, the corresponding pin can extend obliquely relative to the extending plane of the inner side of the second housing wall. In an improved embodiment, for example, two or more, particularly three or more, and possibly exactly four fixing parts, each with a pin, are provided on the second housing wall, and the circuit board is inserted into these fixing parts. In this case, the shape, position, and size of the fixing parts on the second housing wall are set such that the circuit board inserted therein remains inclined relative to the inner side of the housing wall. For example, for this purpose, in the four fixing parts, the pins are constructed to protrude from the second housing wall in pairs at different degrees of inclination.

[0022] To secure the circuit board to the mounting portion of the second housing wall without the need for additional fasteners, the mounting portion of the second housing wall can be thermally riveted to the circuit board. This specifically includes an embodiment in which both the speaker and the circuit board are thermally riveted to the opposing second housing wall.

[0023] In one embodiment, the circuit board (regardless of its orientation within the speaker housing) can be connected to a plug-in connector accessible from the outside of the speaker housing. This plug-in connector can then be adapted and configured to connect the speaker unit to a power source and / or higher-level electronic control units of the vehicle.

[0024] The circuit board is connected to a plug-in connector, for example, within the cavity via connecting contacts. In one embodiment, the corresponding connecting contacts are located on a connecting boss protruding into the cavity from the second housing wall. Providing connecting contacts on an inwardly protruding connecting boss is particularly suitable when the circuit board is angled within the speaker housing cavity. The corresponding connecting boss may be advantageous in this case as an alternative or supplementary solution, allowing the externally accessible plug-in connector to be recessed relative to the outer surface of the speaker housing.

[0025] If the circuit board, which is tilted and disposed in the inner cavity, is part of the speaker unit, then at least one fixing part that holds the circuit board in the tilted orientation can be disposed on the connecting boss.

[0026] To accommodate the recessed connector on the outside of the speaker housing, the connector can be received in a recess on the outside of the second housing wall. This outer recess is thus formed by a connecting boss protruding from the inside of the second housing wall.

[0027] In one embodiment based on this, for example, the outer side of the second housing wall is formed by a flat housing surface, and the recess is recessed inward relative to this flat housing surface. By placing the plug connector in the inwardly recessed portion, the flat housing surface can be used to stack speaker units of the same construction during transport. Therefore, speaker units of the same construction can be transported smoothly and compactly stacked on top of each other because there are no protruding plug connectors on the outside of the speaker housing affecting stacking stability.

[0028] In principle, the second housing wall can be formed by a housing cover (as a second housing component) that encloses the inner cavity of the speaker housing. The housing cover can be connected to the speaker housing (first) housing component that houses the speaker to close the inner cavity. For example, the housing cover and the speaker housing component can be laser-welded to each other. This allows for additional automation of assembly, thereby reducing assembly time. Furthermore, no additional fasteners are required to secure the housing cover to the other housing component.

[0029] In principle, components of the speaker housing, such as the first housing part that houses the speaker and the housing cover, can be made of plastic.

[0030] In one embodiment, a permeable grille area is provided on the speaker housing, and this grille area is arched in the direction of surrounding the external space of the speaker housing. Through the corresponding arch, liquid impacting the grille area from the outside can be guided outward to the edge of the speaker housing.

[0031] As an alternative or supplementary solution, the size of the grille region in the first housing wall can be adjusted according to the size of the speaker arranged in the inner cavity, such that the venting channels for sound transmission in the grille region (which may be S-shaped or Z-shaped in cross-section) are only provided in the section of the first housing wall opposite the speaker diaphragm, but do not extend beyond the edge of the diaphragm. In this way, for example, the diameter of the grille region can be smaller than the diameter of the speaker diaphragm (or membrane). Correspondingly, although water may enter the housing towards the speaker through the channels of the grille region where possible, it will not reach the seal between the first housing wall and the speaker fixed inside the first housing wall.

[0032] In principle, the speaker housing can be configured to be waterproof, especially according to the waterproof performance of protection ratings of IP67 and / or IP69.

[0033] To drain liquid entering the cavity of the speaker housing, one embodiment is configured such that at least one drain outlet with at least one drain connector is provided on at least one housing wall, or possibly multiple or all housing walls, of the speaker housing.

[0034] Furthermore, an acoustic alarm system for vehicles is also part of the solution proposed in this invention. This acoustic alarm system is configured to generate a sound audible to people in the environment surrounding the vehicle, the sound (specifically its frequency) varying according to the vehicle's speed in order to acoustically attract the attention of the moving vehicle. The alarm system proposed in this invention has at least one speaker unit according to the proposed solution. In this case, the corresponding speaker unit can be configured to be installed in the front or rear area of ​​the vehicle to emit appropriate noise characteristics depending on the vehicle's status, for example, acoustically alerting pedestrians to the approach or departure of the vehicle.

[0035] Another aspect of the solution proposed in this invention relates to a method for assembling a loudspeaker unit. In this case, it is configured to assemble the loudspeaker unit...

[0036] - The loudspeaker is placed inside the cavity of the loudspeaker unit's loudspeaker housing (first housing component), which is still open on one side, and is fixed to the inner side of the first housing wall of the loudspeaker housing.

[0037] - Fix the speaker unit circuit board, which will also be arranged in the inner cavity, to the second housing component (as a housing cover) of the speaker housing, and

[0038] - The inner cavity is sealed by a housing cover and a circuit board fixed to the housing cover, wherein the circuit board is connected to the speaker via a connector before or during the sealing process of the inner cavity by the housing cover.

[0039] In principle, one embodiment of the assembly method can be configured as an embodiment for assembling the loudspeaker unit. Therefore, the advantages and features of the embodiment for the proposed loudspeaker unit explained above and below also apply to the embodiment of the proposed assembly method, and vice versa.

[0040] Accordingly, the speaker can be specifically configured such that it is fixed to a first housing wall, which integrates a venting grille area for transmitting sound outward, the grille area comprising multiple (at least two) (air) channels in a Z-shaped or S-shaped cross-section. Alternatively or supplementarily, the speaker can be thermally riveted to a fixing portion of the first housing wall, and / or the circuit board can be fixed to its inner side in an orientation inclined relative to the housing cover.

[0041] In one embodiment, it can be further configured such that the housing cover and the (first) housing component of the speaker housing, which accommodates the speaker and forms the first housing wall, are laser welded together.

[0042] The accompanying figures illustrate possible variations of the proposed solution as examples.

[0043] Here:

[0044] Figure 1A A perspective view showing one implementation variation of the speaker unit having a square speaker housing;

[0045] Figure 1B Show Figure 1A The outer side of the speaker housing cover shown;

[0046] Figure 2A Show Figure 1A The image shows an internal view of the speaker housing after the housing cover has been removed.

[0047] Figure 2B A perspective internal view of the speaker housing is shown;

[0048] Figure 3 A perspective view of the housing cover is shown, with the viewpoint facing inwards.

[0049] Figure 4 Showing with Figure 3A view of the housing cover from a corresponding angle, showing the speaker unit circuit board mounted thereon;

[0050] Figure 5 A first cross-sectional view of the speaker housing enclosed by the housing cover is shown;

[0051] Figure 6 Showing relative to Figure 5 Another cross-sectional view of the enclosed speaker housing rotated 90°;

[0052] Figure 7 Show Figures 1A to 6 A cross-sectional view of an improved version of the loudspeaker unit shown.

[0053] Figure 1A A speaker unit E for a vehicle acoustic alarm system is shown in perspective. Speaker unit E in this case has a square speaker housing 1, within which a speaker 2 is protectively housed. This speaker is used to generate sound whose frequency varies with driving speed. Speaker 2 (see also...) Figure 2A and 2B In this case, it is fixed to the base plate 10 of the speaker housing 1 by a total of four fixing parts 10.1-10.4. Here, the base plate 10 forms the first housing wall of the speaker housing 1, which is integrated into the (first) housing component 12. On the outside, the base plate 10 is configured in its middle region as a ventilated grille area 100.

[0054] Furthermore, a drain groove 101 is formed around the base plate 10 in the circumferential direction. The drain groove 101 collects liquid flowing from the outside of the base plate 10 toward the edge of the base plate 10, and this liquid is discharged in the drain groove 101 along the side wall of the speaker housing 1 at the discontinuities 102a, 102b or 102c provided on the edge side.

[0055] Threaded holes 120, 121, and 122 (see also) are provided on two opposite side walls of the speaker housing 1—arranged staggered from each other in this invention. Figure 2B Through these threaded holes 120, 121 and 122, the speaker unit E can be fixed to the vehicle via a threaded connection, for example, to the front or rear bumper area.

[0056] On the side opposite to the base plate 10, the speaker housing 1 is closed by a second housing component in the form of a housing cover 11. This housing cover 11 is configured as follows: Figure 1B The flat outer side is shown. A recessed portion 110 is provided on the outer side. A plug connector, in this case, is in the form of a connection socket 111, disposed in this recessed portion 110. Through this connection socket 111, the speaker unit E can be connected to the vehicle-side power supply and / or the vehicle-side electronic control device.

[0057] Since the connector 111 is fully disposed within the recess 110 and does not protrude outward from the speaker housing 1, the speaker unit E can be stacked well with other speaker units E of the same construction and transported in a space-saving manner. This, in turn, significantly reduces the logistical costs of transporting and storing multiple speaker units.

[0058] A circuit board 3 is fixed inside the housing cover 11. Figure 2A and 2B As can be seen in the internal view, the circuit board 3 controls the generation of sound via the speaker 2 based on signals received through the connection port 110. For this purpose, the circuit board 3 is connected via a connector 4 with rigid, longitudinally extending plug contacts 42.

[0059] In this invention, the speaker 2 is arranged inside the base plate 10 and fixed to the fixing parts 10.1-10.4. In this case, when assembling the speaker unit E, the through holes provided at the fixing edges 21-24 of the speaker 2 are inserted into the fixing pins at the fixing parts 10.1-10.4 of the base plate 10. The corresponding fixing pins are, for example, heat-riveted to fix the speaker 2 to the base plate 10. Alternatively, for example, a threaded connection can be made between the fixing edges 21-24 and the inside of the base plate 10.

[0060] For example from Figure 2B As can be seen from the perspective internal view, in this invention, the circuit board 3 is tilted within the cavity 123 defined by the first housing component 12 of the speaker housing 1, thereby reducing the mounting space occupied by the circuit board 3 within the speaker housing 1. This also relatively reduces material consumption, thereby saving material and assembly costs.

[0061] Here, the corresponding tilt or oblique orientation of the circuit board 3 is achieved by the housing cover 11 pre-mounted with the circuit board 3. Thus, as... Figure 3 As shown, the housing cover 3 has a plurality of fixing portions with pins 113.1-113.4 on its inner side. These pins 113.1-113.4 are inclined relative to the extending plane of the inner side of the housing cover 11 and protrude from the inner side of the housing cover 11 in pairs at different degrees. When a circuit board 3 having a total of four insertion holes 30-34 provided thereon is inserted into these pins 113.1-113.4, the circuit board 3 is held at the housing cover 11 with an inclined orientation. In this case, the first pair of pins 113.1, 113.2 protrudes more significantly from the inner side of the housing cover 11 than the second pair of pins 113.3, 113.4. In this case, the first pair of pins 113.1, 113.2 are constructed at the connecting boss 112 protruding inward from the housing cover 11. The connecting boss 112 forms a recess 110 on its outer side for connecting the socket 111.

[0062] A connecting contact point 1120 is provided on the inner contact surface of the connecting boss 112, and the circuit board 3 can achieve electrical contact with the connecting socket 110 through the connecting contact point. Therefore, if the circuit board 3 is like this... Figure 4 As shown, when inserted into pins 113.1-113.4, circuit board 3 rests against connecting boss 112 and can make contact with connecting socket 111 through its contact point 1120. Furthermore, circuit board 3 is tilted. Therefore, circuit board 3 can be... Figure 4 The circuit board 3 is pre-installed on the inside of the housing cover 11. In this case, it can also be configured such that the fixing part with pins 113.1-113.4 is heat-riveted to fix the circuit board 3 to the housing cover 11.

[0063] In the pre-installed state, the rigid insertion contact 42 of the connector 4 protrudes from the circuit board 3. Therefore, when the housing cover 11 is installed onto the housing component 12 with the base plate 10, the insertion contact 42 automatically plugs into the speaker 2.

[0064] To secure the housing cover 11 to another (first) housing component 12, the housing cover 11 and the housing component 12 are laser welded together.

[0065] For example from Figure 5 As can be seen in the cross-sectional view, in the assembled state of speaker unit E, speaker 2 is protectively housed within speaker housing 1 and connected to an angled circuit board 3, which is made accessible via contact points 1120 in the connecting boss 112. Speaker 2 is arranged opposite the grille region 100 with its vibrating diaphragm, allowing sound generated by speaker 2 to be transmitted outward through the grille region 100. In this invention, the diaphragm of speaker 2 is sealed relative to the liquid, preventing liquid entering the inner cavity 123 through the venting grille region 100 from damaging the diaphragm.

[0066] In contrast, a high-pressure water jet impacting the diaphragm of speaker 2 could severely damage speaker 2. To avoid this, the grille area 100, as... Figure 6 The cross-sectional view shows a configuration with (air) channels 1003, each shaped like a Z or an S in cross-section. The correspondingly constructed channels 1003 extend outwards in a mirror image from the central rib 1001, which is T-shaped in cross-section, at the center of the grille region 100. In this case, a corresponding first channel 1003 is formed between the central rib 100 and the first grille rib 1002a or 1002b. Other channels 1003 are formed between adjacent grille ribs 1002a or 1002b, each also shaped like a Z or an S.

[0067] The selected channel shape of channel 1003 ensures that a water column impacting the outer grid region 100 of the base plate 10 will not reach the speaker 2 unimpeded, and in particular, will not reach the membrane on its inner side opposite the grid region 100. Therefore, although liquid, especially water, can still pass through the grid region 100 to reach the speaker 2, the Z-shaped or S-shaped channels 1003 in the grid region 100 in cross-section ensure that any possible water column cannot directly pass through the grid region 100 to impact the speaker 2.

[0068] Figure 7 The sectional view shows Figures 1A to 6 This is a possible improvement to the embodiment of the speaker unit E shown. In this embodiment, the circuit board 3 is also fixed in an inclined orientation within the cavity 123, and in this case, it is specifically supported at the inwardly protruding connecting boss 112. Therefore, the recess 110 corresponding to the connecting boss 112 also fully accommodates the connecting socket 111 and its plug flange on the outside of the speaker housing 1.

[0069] and Figures 1A to 6 The implementation variations are different, in Figure 7 In the speaker unit E shown, the grille region 100, located in the form of a base plate 10 on the first housing wall, is specifically configured to arch outwards. This outward arching allows liquid impacting the grille region 100 to be directed to the edge of the speaker housing 1.

[0070] Figure 7 The cross-sectional view further clearly shows that the grille region 100 and the rib structure (formed by ribs 1001, 1002a, 1002b) therein are adapted to the speaker 2 fixed to the inside of the base plate 10, so that the water jet impacting the outside of the base plate 10 cannot reach the seal D between the base plate 10 and the speaker 2. For this purpose, the extension of the grille region 100 does not exceed the diaphragm of the speaker 2. Furthermore, the diameter of the inwardly projecting circumferential flange of the base plate 10 is smaller than the sealing flange of the speaker 2 for the edge of the diaphragm surrounding the seal D. The grille region 100 is correspondingly sized so that the channel 1003 does not oppose this sealing flange for the seal D. Therefore, the direct jet of water impacting the outside of the high-pressure washer from the grille region 100 cannot reach the seal D between the speaker 3 and the base plate 10. Additionally, this design is also provided... Figures 1A to 6 In the implementation variant (see) Figure 6 (Cross-sectional view).

[0071] To allow liquid entering the inner cavity 123 to drain from the speaker housing 1, the speaker housing 1 has at least one drain connector. Where possible, at least one corresponding drain connector may also be provided on multiple or even all housing walls of the speaker housing 1 to enable the drainage of liquid from the inner cavity 123 at different feasible mounting locations of the speaker housing 1.

[0072] List of reference numerals

[0073]

Claims

1. A speaker unit for a vehicle, the speaker unit having a speaker housing (1) and a speaker (2) housed in an inner cavity (123) of the speaker housing (1), wherein the speaker housing (1) has a first housing wall (10), the speaker (2) is fixed to the inner side of the first housing wall facing the inner cavity (123), and the first housing wall is air-permeable to transmit sound generated by the speaker (2) outward to the external space surrounding the speaker housing (1), Its features are, The first housing wall (10) on which the speaker (2) is fixed is provided has a breathable grille area (100) which includes a plurality of channels (1003) that are each Z-shaped or S-shaped in cross-section for transmitting sound.

2. The loudspeaker unit according to claim 1, characterized in that, The grille area (100) is opposite to the speaker (2).

3. The loudspeaker unit according to claim 1 or 2, characterized in that, The channel (1003) is at least partially formed between the grid ribs (1002a, 1002b) in the grid region (100), which are also constructed in a Z-shape or S-shape in cross-section.

4. The loudspeaker unit according to claim 3, characterized in that, In the cross-sectional view, the Z-shaped or S-shaped profile of the adjacent grid ribs (1002a, 1002b) is rotated 90° relative to the Z-shaped or S-shaped profile of the channel (1003) formed between the adjacent grid ribs (1002a, 1002b).

5. A speaker unit for a vehicle, particularly a speaker unit according to any one of the preceding claims, having a speaker housing (1) and a speaker (2) housed in an inner cavity (123) of the speaker housing (1), wherein the speaker housing (1) has a first housing wall (10) on the inner side of the first housing wall facing the inner cavity (123) and the speaker (2) is fixed thereon. Its features are, The speaker (2) is fixed to the inner side of the first housing wall (10) by the heat-riveting fixing part (10.1-10.4) of the first housing wall (10).

6. The loudspeaker unit according to claim 8, characterized in that, The hot riveting fixing part (10.1-10.4) has a boss protruding into the inner cavity (123) on the inner side of the first housing wall (10).

7. The loudspeaker unit according to any one of the preceding claims, characterized in that, The speaker (2) has at least one fixed edge (21, 22, 24) with a through hole for fixing to the inside of the first housing wall (10).

8. A speaker unit for a vehicle, particularly a speaker unit according to any one of the preceding claims, comprising a speaker housing (1) and a speaker (2) housed in an inner cavity (123) of the speaker housing (1), wherein the speaker housing (1) has a first housing wall (10) on the inner side of the first housing wall facing the inner cavity (123) to which the speaker (2) is fixed, and the speaker housing (1) has a second housing wall (11) on the inner side of the second housing wall opposite to the inner side of the first housing wall (10) in the inner cavity (123). Its features are, The speaker (2) is connected to the circuit board (3), which is fixed to the inside of the second housing wall (11).

9. The loudspeaker unit according to claim 11, characterized in that, A connector (4) with at least one rigid, longitudinally extending plug contact (42) is provided on the circuit board (3), and the speaker (2) is connected to the circuit board (3) through the plug contact.

10. The loudspeaker unit according to claim 11 or 12, characterized in that, The inner sides of the first housing wall and the second housing wall (10, 11) that are opposite to each other in the inner cavity (123) extend in parallel planes, and the circuit board (3) is arranged obliquely in the inner cavity (123) relative to the planes.

11. The loudspeaker unit according to claim 13, characterized in that, The circuit board (3) is held in the cavity (123) at an angle relative to the extension plane by a fixing part (113.1-113.4) protruding inside the second housing wall (11).

12. The loudspeaker unit according to claim 14, characterized in that, At least one of the fixing parts of the second housing wall (11) is configured to have a pin (113.1-113.4) that is inserted into a through hole in the circuit board (3).

13. The loudspeaker unit according to claim 14 or 15, characterized in that, The fixing part (113.1-113.4) of the second housing wall (11) is thermally riveted to the circuit board (3).

14. The loudspeaker unit according to any one of claims 11 to 16, characterized in that, The circuit board (3) is connected to a plug connector (111) that can be accessed from the outside of the speaker housing (1).

15. The loudspeaker unit according to claim 17, characterized in that, The circuit board (3) is connected to the plug connector (111) via a connection contact point (1120), which is located at the connection boss (112) protruding from the second housing wall (11) into the inner cavity (123).

16. The loudspeaker unit according to claims 14 and 17, characterized in that, At least one of the fixing parts (113.1-113.4) for the circuit board (3) is provided at the connecting boss (112).

17. The loudspeaker unit according to any one of claims 17 to 18, characterized in that, The plug connector (111) is accommodated in a recess (110) on the outside of the second housing wall (11).

18. The loudspeaker unit according to claim 20, characterized in that, The outer side of the second housing wall (11) is formed by a flat housing surface, and the recess (110) is recessed inward relative to the flat housing surface.

19. The loudspeaker unit according to any one of claims 11 to 21, characterized in that, The second housing wall is formed by a housing cover (11) that closes the inner cavity (123) of the speaker housing (1).

20. The loudspeaker unit according to any one of the preceding claims, characterized in that, The outer side of the first housing wall (10) on which the speaker (2) is fixed is provided with a drain groove (101) for draining liquid from the outside of the housing (1).

21. The loudspeaker unit according to claim 20, characterized in that, The drain trough (101) is constructed circumferentially around the outer side.

22. The loudspeaker unit according to claim 21, characterized in that, The drain trough (101) has at least one discontinuity (102a, 102b, 102c) along the circumferential direction, through which liquid can flow from the drain trough (101) toward the second housing wall (11), the inner side of the second housing wall is opposite to the first housing wall (10) in the inner cavity (123), and the speaker (2) is fixed to the inner side of the first housing wall.

23. The loudspeaker unit according to any one of the preceding claims, characterized in that, A breathable grille area (100) is provided on the first housing wall (10) on which the speaker (2) is fixed inside, so as to transmit the sound generated by the speaker (2) outward to the external space surrounding the speaker housing (1), wherein the grille area (100) is constructed in an arch shape in the direction of the external space.

24. An acoustic alarm system for a vehicle for generating a sound audible to persons in the environment surrounding the vehicle, the sound varying according to the speed of the vehicle to acoustically attract attention to the moving vehicle, characterized in that, The alarm system includes at least one speaker unit (E) according to any one of the preceding claims.

25. A method for assembling a loudspeaker unit (E), particularly for assembling a loudspeaker unit (E) according to any one of claims 1 to 23, wherein the loudspeaker unit (E) comprises a loudspeaker housing (1), a loudspeaker (2), and a circuit board (3), wherein the method for assembling the loudspeaker unit (E) is described. - The loudspeaker (2) is arranged in the inner cavity (123) of the loudspeaker housing (1), which is still open on one side, and fixed to the inner side of the first housing wall (10) of the loudspeaker housing (1). - The circuit board (3) to be placed in the inner cavity (123) is fixed at the housing cover (11) of the speaker housing (1), and - The inner cavity (123) is closed by the housing cover (11) and the circuit board (3) fixed to the housing cover, wherein the circuit board (3) is connected to the speaker (2) by a connector (4) before or during the closure of the inner cavity (123) by the housing cover (11).

26. The method according to claim 25, characterized in that, The housing cover (11) and the housing component (12) of the speaker housing (1) that accommodates the speaker (2) are laser welded together.

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