A horn cover, a sound-emitting device, and a vehicle
By designing multiple spaced support sections on the speaker cover bracket and a gap ratio greater than that of the sound-permeable holes, the structural rigidity and sound transmission of the speaker cover are improved, the deformation problem of the speaker cover under compression or impact is solved, and efficient sound wave propagation is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- AVATR CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-26
AI Technical Summary
The high density of openings in the speaker grille results in low structural strength, making it prone to deformation and failure under pressure or impact, thus failing to meet usage requirements.
The speaker enclosure is designed with multiple spaced support sections. The ratio of the area of the gap to the area of the sound-permeable hole is greater than the ratio of the area of the support body to the area of the enclosure, forming an impedance gradient structure, which improves the structural rigidity and reduces sound wave reflection and energy loss.
It improves the structural rigidity and sound transmission of the speaker grille, reduces the probability of deformation failure, and optimizes the coupling and propagation of sound wave energy.
Smart Images
Figure CN224290033U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of horn cover technology, and more particularly to a horn cover, a sound-generating device, and a vehicle. Background Technology
[0002] As a crucial component of vehicle safety warning systems, the horn cover's design must simultaneously meet the dual requirements of sound transmission and structural rigidity. However, current technologies often employ a high density of openings in horn covers to achieve better sound transmission. This results in lower structural strength, making the cover prone to deformation and failure under pressure or impact, thus failing to meet usage requirements. Utility Model Content
[0003] This application provides a speaker grille, a sound-generating device, and a vehicle, which can improve the sound transmission and structural rigidity of the speaker grille.
[0004] In a first aspect, this application provides a speaker cover, which includes a cover body and a support. The cover body has multiple sound-permeable holes. The support has a support body for abutting against the cover body. The support body includes multiple spaced-apart first support portions. Along the arrangement direction of the first support portions, a gap is formed between two adjacent first support portions. The ratio of the area of the gap to the area of the support body is greater than the ratio of the area of the sound-permeable holes to the area of the cover body.
[0005] The technical solution provided in this application includes a speaker grille comprising a grille body and a support frame. The grille body has multiple sound-permeable holes to ensure adequate sound transmission. The support frame has a support body for contacting the grille body. The support body includes multiple spaced-apart first support portions, which provide support to the grille body, increasing its structural strength and reducing the probability of deformation and failure due to compression or impact. A gap is formed between adjacent first support portions along their arrangement direction. The ratio of the gap area to the support body area is greater than the ratio of the sound-permeable hole area to the grille body area. Thus, the proportion of the area of the gap region to the surface area of the support body is greater than the proportion of the area of the sound-permeable hole area to the surface area of the grille body. During sound wave propagation, reflection occurs when sound waves encounter obstacles, affecting sound transmission. Increasing the proportion of gaps in the support body reduces the probability of sound waves encountering the first support portions during propagation, thereby reducing sound wave reflection and energy loss, and improving sound transmission. In addition, the proportion of gaps on the support is greater than that of sound-permeable holes on the enclosure, which can form an impedance gradient structure. That is, the support and the enclosure have different acoustic impedances along the direction of sound wave propagation. In this way, efficient coupling of sound wave energy can be achieved within the matching frequency band, while suppressing energy loss caused by reflection and modal resonance, further improving sound transmission.
[0006] In one possible implementation provided in this application, the first support portion is annular, and multiple first support portions are arranged around the same center point and are arranged at radial intervals along the first support portions.
[0007] In one possible implementation provided in this application, the sound-permeable hole is an arc-shaped hole, the extension direction of the arc-shaped hole is parallel to the circumferential direction of the first support part, and the arc-shaped hole is aligned with the gap between two adjacent first support parts along the contact direction between the support body and the cover body.
[0008] In one possible implementation provided in this application, the support body further includes a second support portion, the extension direction of the second support portion being parallel to the radial direction of the first support portion, and the second support portion being connected to each of the first support portions respectively.
[0009] In one possible implementation provided in this application, the support body further includes a third support portion. The extension direction of the third support portion is parallel to the radial direction of the first support portion. Along the radial direction of the first support portion, the size of the third support portion is smaller than the size of the second support portion, so that the third support portion is connected to a portion of the first support portion. Along the circumference of the first support portion, the third support portion and the second support portion are alternately arranged.
[0010] In one possible implementation provided in this application, the ratio between the dimension of the first support portion in the first support portion arrangement direction and the dimension in the direction of contact between the support body and the cover body is greater than 0.6 and less than 1.
[0011] In one possible implementation provided in this application, the size of the first support portion is less than or equal to 2.5 mm along the arrangement direction of the first support portion.
[0012] In one possible implementation provided in this application, along the arrangement direction of the first support portion, the size of the gap between two adjacent first support portions is greater than or equal to 10 mm and less than or equal to 20 mm.
[0013] Secondly, this application provides a sound-generating device, which includes a sound-generating unit and a speaker cover provided in any of the first aspects, the speaker cover being disposed outside the sound-generating unit.
[0014] Since the sound-generating device includes the speaker grille provided in any of the first aspects, it has the same technical effect. That is, it can improve the sound transmission and structural rigidity of the speaker grille.
[0015] Thirdly, this application provides a vehicle including a body and a sound-emitting device provided in the second aspect, the sound-emitting device being mounted on the body.
[0016] Since the vehicle includes the sound-generating device provided in the second aspect, and the sound-generating device includes the horn cover provided in any of the first aspects, it has the same technical effect. That is, it can improve the sound transmission and structural rigidity of the horn cover. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of the cover provided in an embodiment of this application;
[0018] Figure 2 for Figure 1 A partial sectional view at point AA in the middle;
[0019] Figure 3 This is one of the structural schematic diagrams of the bracket provided in the embodiments of this application;
[0020] Figure 4 This is a schematic diagram of the structure of the speaker cover provided in an embodiment of this application;
[0021] Figure 5 for Figure 4 A partial sectional view at point BB;
[0022] Figure 6 This is a second schematic diagram of the structure of the bracket provided in the embodiments of this application.
[0023] Figure label:
[0024] 1-Cover body; 11-Sound transmission hole; 12-Clamping foot; 2-Bracket; 21-Support body; 211-First support part; 212-Second support part; 213-Third support part; 22-Step surface; 23-First area; 24-Second area; 3-Blackout cloth. Detailed Implementation
[0025] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.
[0027] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.
[0028] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.
[0029] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.
[0030] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0031] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.
[0032] As a crucial component of vehicle safety warning systems, the horn cover's design must simultaneously meet the dual requirements of sound transmission and structural rigidity. However, current technologies often employ a high density of openings in horn covers to achieve better sound transmission. This results in lower structural strength, making the cover prone to deformation and failure under pressure or impact, thus failing to meet usage requirements.
[0033] To address the aforementioned issues, this application provides a vehicle. It should be noted that the vehicle mentioned in this application can refer to large vehicles, small vehicles, special-purpose vehicles, etc. For example, according to vehicle type, the vehicle in this application can refer to a sedan, an off-road vehicle, a multi-purpose vehicle (MPV), or other vehicle types.
[0034] In this embodiment, the vehicle includes a body and a sound-generating device mounted on the body. Here, the body refers to the overall load-bearing structure of the vehicle, which may include the vehicle frame, outer body panels, and interior components. The sound-generating device refers to a device that converts electrical signals into mechanical vibrations and radiates sound waves, and may include an electric loudspeaker, a piezoelectric loudspeaker, an alarm, etc.
[0035] In this application embodiment, the installation position of the sound-generating device on the vehicle body is possible in various ways. For example, the sound-generating device can be installed inside the vehicle body or outside the vehicle body. This application embodiment does not limit this.
[0036] In addition, this application embodiment also provides a sound-generating device, which includes a sound-generating unit and a speaker cover, with the speaker cover disposed outside the sound-generating unit. Here, the sound-generating unit is the core component of the sound-generating device, responsible for converting electrical signals into mechanical vibrations and radiating sound waves, and may include a diaphragm, a magnetic circuit system, a voice coil, etc. The speaker cover is a protective structure covering the outside of the sound-generating unit to provide acoustic control and physical protection.
[0037] In addition, refer to Figure 1 , Figure 3 and Figure 4 This application embodiment also provides a speaker cover, which includes a cover body 1 and a support 2. The cover body 1 has a sound-transmitting hole 11, and a plurality of sound-transmitting holes 11 are provided. The support 2 has a support body 21 for abutting against the cover body 1. The support body 21 includes a plurality of spaced first support portions 211. Along the arrangement direction of the first support portions 211, a gap is formed between two adjacent first support portions 211. The ratio of the area of the gap to the area of the support body 21 is greater than the ratio of the area of the sound-transmitting hole 11 to the area of the cover body 1.
[0038] In this embodiment, the cover 1 serves as the external protective structure of the speaker cover, and its shape design has various possibilities. For example, the cover 1 can be a regular shape such as a circle, square, or triangle, or it can be an irregular shape. This embodiment does not limit this.
[0039] In this embodiment, the sound-permeable hole 11 is an opening structure on the cover 1 to optimize the propagation effect of sound waves. Here, the shape design of the sound-permeable hole 11 has various possibilities. For example, the sound-permeable hole 11 can be a round hole or a square hole. However, this embodiment does not impose any limitations.
[0040] In addition, the arrangement of the sound-permeable holes 11 can also be varied. For example, multiple sound-permeable holes 11 can be arranged in a matrix, concentric circles, gradient, or other regular manner, or they can be arranged randomly. This application embodiment does not limit this.
[0041] In this embodiment, the bracket 2 serves as an internal support structure for the cover 1, and the support body 21 of the bracket 2 is used to abut against the cover 1 to provide support for the cover 1. It should be noted that, in order to improve the support effect of the support body 21 on the cover 1, the shape design of the support body 21 can be adapted to the shape of the cover 1.
[0042] In this embodiment, the shape design of the first support portion 211 can have various possibilities, for example, referring to... Figure 6 The first support portion 211 can be straight; or, the first support portion 211 can be wavy; or, the first support portion 211 can be annular. This application does not limit the specific form of the support portion 211.
[0043] In this embodiment, the connection between the cover 1 and the bracket 2 can be varied. For example, the cover 1 and the bracket 2 can be connected by adhesive, snap-fit, or fasteners. This embodiment does not limit the connection in this respect. (Refer to...) Figure 1 In one possible embodiment of this application, the cover 1 has a locking foot 12, and the bracket 2 has a locking hole that is adapted to engage with the locking foot 12. The cover 1 and the bracket 2 are connected by the locking foot 12.
[0044] In this embodiment, the ratio of the area of the gap to the area of the support 21 refers to the ratio of the area of the region containing the gap on the support 21 to the surface area of the support 21. The ratio of the area of the sound-permeable hole 11 to the area of the cover 1 refers to the ratio of the area of the region containing the sound-permeable hole 11 to the surface area of the cover 1.
[0045] In this embodiment, the ratio of the area of the gap to the area of the support 21 and the ratio of the area of the sound-permeable hole 11 to the area of the cover 1 can be various. For example, the ratio of the area of the gap to the area of the support 21 can be 70%, and the ratio of the area of the sound-permeable hole 11 to the area of the cover 1 can be 65%; or, the ratio of the area of the gap to the area of the support 21 can be 80%, and the ratio of the area of the sound-permeable hole 11 to the area of the cover 1 can be 70%. This embodiment does not limit these ratios.
[0046] In this embodiment of the application, in order to optimize the propagation effect of sound waves, when the support body 21 of the bracket 2 abuts against the cover 1, at least a portion of the gap can be aligned with the sound-transmitting hole 11 along the abutment direction of the support body 21 and the cover 1.
[0047] In the technical solution provided in this application embodiment, the speaker cover includes a cover body 1 and a support 2. The cover body 1 has multiple sound-permeable holes 11 to ensure good sound transmission. The support 2 has a support body 21 for contacting the cover body 1. The support body 21 includes multiple spaced-apart first support portions 211, which provide support for the cover body 1, improving its structural strength and reducing the probability of deformation and failure due to compression or impact. A gap is formed between adjacent first support portions 211 along the arrangement direction of the first support portions 211. The ratio of the area of the gap to the area of the support body 21 is greater than the ratio of the area of the sound-permeable hole 11 to the area of the cover body 1. Therefore, the proportion of the area of the gap to the surface area of the support body 21 is greater than the proportion of the area of the sound-permeable hole 11 to the surface area of the cover body 1. During sound wave propagation, if the sound wave encounters an obstacle, it will be reflected, thus affecting the sound transmission. The increased proportion of the gap on the support 21 reduces the probability of sound waves encountering the first support 211 during propagation, thereby reducing sound wave reflection and energy loss and improving sound transmission. Furthermore, the larger proportion of the gap on the bracket 2 compared to the larger proportion of the sound-transmitting hole 11 on the enclosure 1 creates an impedance gradient structure. That is, along the direction of sound wave propagation, the bracket 2 and the enclosure 1 have different acoustic impedances. This allows for efficient coupling of sound wave energy within the matching frequency band, while also suppressing energy loss due to reflection and modal resonance, further enhancing sound transmission.
[0048] Reference Figure 2 In one possible embodiment of this application, the first support portion 211 is annular, and multiple first support portions 211 are arranged around the same center point and radially spaced. This concentric arrangement of the multiple first support portions 211 reduces the obstruction and reflection of sound waves. When the sound-emitting unit emits sound, the sound waves radiate outward from the center in the form of spherical waves. This arrangement of the first support portions 211 better matches the direction of sound wave propagation, thereby reducing obstruction and reflection. Furthermore, this arrangement of the first support portions 211 allows the support body 21 to be radially symmetrical. This, on the one hand, ensures uniform load distribution, and on the other hand, better absorbs multi-directional impact energy, thereby improving the support effect on the cover 1.
[0049] Reference Figure 1 In one possible embodiment of this application, the sound-permeable hole 11 is an arc-shaped hole, the extension direction of which is parallel to the circumferential direction of the first support portion 211. Along the contact direction between the support body 21 and the cover body 1, the arc-shaped hole is aligned with the gap between two adjacent first support portions 211. In this way, the shape of the sound-permeable hole 11 can be adapted to the shape of the gap, thereby increasing the alignment area between the gap and the sound-permeable hole 11, which is beneficial to further enhance the propagation effect of sound waves.
[0050] In this embodiment of the application, along the radial direction of the first support portion 211, there are a variety of possible connection methods between two adjacent first support portions 211. For example, a honeycomb or triangular mesh structure is filled between two adjacent first support portions 211, and the two adjacent first support portions 211 are connected by the mesh structure.
[0051] Reference Figure 2 In one possible embodiment of this application, the support 21 further includes a second support portion 212, the extension direction of which is parallel to the radial direction of the first support portion 211, and the second support portion 212 is connected to each of the first support portions 211. This design, on the one hand, can improve the torsional stiffness of the bracket 2; on the other hand, it can reduce the area of the gap occupied by the connection between adjacent first support portions 211, thereby avoiding the main axial radiation of sound waves and optimizing the propagation effect of sound waves.
[0052] Reference Figure 2 In this embodiment, the support body 21 further includes a third support portion 213. The extension direction of the third support portion 213 is parallel to the radial direction of the first support portion 211. Along the radial direction of the first support portion 211, the size of the third support portion 213 is smaller than the size of the second support portion 212, so that the third support portion 213 is connected to a portion of the first support portion 211. Along the circumference of the first support portion 211, the third support portion 213 and the second support portion 212 are alternately arranged. Here, the third support portion 213 and the second support portion 212 are designed with different lengths. The second support portion 212 forms a continuous force transmission network running through the entire support body 21 by connecting multiple first support portions 211. In this way, when the support body 21 is subjected to a low-frequency, wide-range load, the second support portion 212 can distribute the load to the entire support system 2, avoiding local stress concentration. The shorter third support portion 213 can form a local support unit by connecting a portion of the first support portion 211 to absorb and dissipate high-frequency mechanical vibration energy. Along the circumference of the first support 211, the third support 213 and the second support 212 are alternately arranged, which can break the regularity of airflow on the surface of the support 21, reduce the possibility of wind noise generated by the interaction of sound waves with airflow during propagation, and thus optimize the propagation effect of sound waves.
[0053] It should be noted that the second support part 212 and the third support part 213 can be connected to the first support part 211 by means of welding, riveting or integral molding, and the embodiments of this application do not limit this.
[0054] Reference Figure 2 and Figure 3In this embodiment, to increase the ratio of the area of the gap region on the support 21 to the surface area of the support 21, the ratio between the dimension W of the first support portion 211 in the first support portion 211 arrangement direction and the dimension H of the first support portion 211 in the abutment direction of the support 21 and the cover 1 is greater than 0.6 and less than 1. This design allows the dimension W of the first support portion 211 in the first support portion 211 arrangement direction to be smaller than the dimension H of the first support portion 211 in the abutment direction of the support 21 and the cover 1, avoiding the first support portion 211 occupying too much space in the first support portion 211 arrangement direction. Thus, with a fixed surface area of the support 21, the ratio of the area of the gap region on the support 21 to the surface area of the support 21 increases, thereby improving sound transmission. The structural strength of the support 21 can be achieved by increasing the dimension H of the first support portion 211 in the abutment direction of the support 21 and the cover 1, without affecting the ratio of the area of the gap region on the support 21 to the surface area of the support 21.
[0055] Reference Figure 2 and Figure 3 In this embodiment, the size W of the first support portion 211 along its arrangement direction can have various possibilities. For example, the size W of the first support portion 211 can be 2mm or 3mm, and this embodiment does not limit this. In one possible embodiment, the size W of the first support portion 211 along its arrangement direction is less than or equal to 2.5mm. Thus, the first support portion 211 can, while satisfying the support effect, increase the ratio of the area of the gap region on the support body 21 to the surface area of the support body 21, thereby improving sound transmission.
[0056] Reference Figure 2 and Figure 3 In this embodiment, the dimension H of the first support portion 211 along the contact direction between the support body 21 and the cover 1 can have various possibilities. For example, the dimension H of the first support portion 211 can be 2.5mm or 4mm, and this embodiment does not limit this. In one possible embodiment, the dimension H of the first support portion 211 along the contact direction between the support body 21 and the cover 1 is greater than or equal to 2.5mm and less than or equal to 4mm. In this way, the first support portion 211 can satisfy the support effect while avoiding the dimension H of the first support portion 211 being too large in the contact direction between the support body 21 and the cover 1, which is beneficial to the miniaturization design of the speaker cover.
[0057] Reference Figure 2In this embodiment of the application, the size L of the gap between two adjacent first support portions 211 along the arrangement direction of the first support portion 211 can be various. For example, the size L of the gap between two adjacent first support portions 211 can be 8mm, 10mm, or 21mm. This embodiment of the application does not limit this.
[0058] Reference Figure 2 In one possible embodiment of this application, along the arrangement direction of the first support portion 211, the size L of the gap between two adjacent first support portions 211 is greater than or equal to 10 mm and less than or equal to 20 mm. In this way, the size design of the gap can be guaranteed to meet the sound transmission requirements, while also ensuring that the first support portion 211 has a good supporting effect on the cover 1, and preventing the cover 1 from deforming due to local compression (such as finger pressing).
[0059] In this embodiment, the support 21 and the cover 1 can be directly abutted or indirectly abutted; this embodiment does not limit this. (Refer to...) Figure 4 and Figure 5 In one possible embodiment of this application, the speaker cover further includes a light-shielding cloth 3, which is disposed between the cover body 1 and the support 2. The light-shielding cloth 3 has mesh holes for sound to pass through, and the support body 21 is indirectly abutted against the cover body 1 through the light-shielding cloth 3. With this design, the light-shielding cloth 3 blocks the support 2, preventing the support 2 from being exposed, thereby improving the aesthetics of the speaker cover.
[0060] In this embodiment, the processing technology of the bracket 2 can be varied. For example, if the material of the bracket 2 is metal, the bracket 2 can be manufactured by stamping, die casting and casting. If the material of the bracket 2 is plastic, the bracket 2 can be manufactured by injection molding, hot pressing and other methods.
[0061] Reference Figure 2 and Figure 3 In one possible embodiment of this application, the bracket 2 is manufactured by injection molding. For this purpose, a stepped surface 22 is formed on the outer peripheral surface of the bracket 2 to serve as the parting surface of the bracket 2.
[0062] Reference Figure 2 and Figure 3In this embodiment, to facilitate demolding, a stepped surface 22 is provided at the middle of the bracket 2, that is, at the center of dimension H of the first support portion 211, along the contact direction between the support body 21 and the cover body 1. Furthermore, along the contact direction between the support body 21 and the cover body 1, the stepped surface 22 divides the outer peripheral surface of the bracket 2 into a first region 23 and a second region 24. Additionally, during injection molding, the first region 23 can contact the side wall of the fixed mold, and the second region 24 can contact the side wall of the moving mold. The slope of the first region 23 can be greater than 5°, and the slope of the second region 24 can be greater than 3°.
[0063] In this embodiment of the application, in order to improve the quality and pass rate of the speaker cover, CAE simulation analysis can be performed on the speaker cover after the design is completed to determine whether the structural stiffness of the speaker cover meets the requirements.
[0064] In this embodiment, the CAE simulation analysis process is illustrated using the horn cover on the A-pillar of a vehicle as an example:
[0065] S100: Finite element modeling of the horn cover. Specifically, the 3D data of the vehicle A-pillar, cover 1, and bracket 2 are imported into finite element preprocessing software (such as Hypermesh) for mesh generation. The vehicle A-pillar and cover 1 can be meshed as shell elements, with element types of 4-node surface shell elements or 3-node triangular shell elements, and the shell elements are assigned thickness attributes. The bracket 2 can be meshed as solid elements, with element type C3D4, and assigned solid attributes. Simultaneously, a layer of shell elements is generated outside the bracket 2, and this layer of shell elements is assigned a thickness attribute of 0.01 mm. Next, material plasticity is established based on the actual materials used in the vehicle A-pillar, cover 1, and bracket 2. Material plasticity can include density, modulus, Poisson's ratio, and stress-strain curves. The corresponding element components are then assigned one-to-one to the material. Finally, internal constraints are established for the horn cover. Cover 1 and bracket 2 are fixed by clamps 12, which are connected using kinematic coupling (kincoup), constraining degrees of freedom 1-6. The support body 21 of bracket 2 provides support to the cover 1 in the pressing direction. Contact can be established between bracket 2 and cover 1. For example, cover 1 is the principal surface, its direction is normal, and it points towards bracket 2; bracket 2 is the secondary surface, its direction is normal, and it points towards cover 1. The contact type between cover 1 and bracket 2 is surface-to-surface contact. Bracket 2 is fixed to the vehicle's A-pillar by a welded column, which is also kinematically coupled and constrains degrees of freedom 1-6. This completes the finite element modeling of the horn cover.
[0066] S200: Establish boundary conditions. Specifically, constrain 1-6 degrees of freedom between the vehicle's A-pillar and the mounting point on the body sheet metal; constrain the degrees of freedom in the limiting direction between the vehicle's A-pillar and the limiting structure on the body sheet metal. If the limiting direction is not in the three-dimensional direction of the global coordinate system, a local coordinate system can be established based on the limiting direction, and constrain 1-6 degrees of freedom between the vehicle's A-pillar and the mounting point on the dashboard.
[0067] S300: Loading. Specifically, a rigid body pressure plate is established at the point where the horn cover needs to be pressed or is at its weakest point. The diameter of the pressure plate can be 15mm, and the element type can be rigid body. The reference point of the pressure plate can be the center of the pressure plate. A local coordinate system is established on the pressure plate, with the Z-axis being the normal to the pressure plate. All points on the pressure plate are assigned to the local coordinate system, and a 50N load is applied at the reference point in the Z-direction of the local coordinate system. Additionally, a surface-to-surface contact is established between the pressure plate and the horn cover. The pressure plate is the master surface, with the normal direction pointing from the pressure plate to the horn cover. The horn cover is the slave surface, with the normal direction pointing from the horn cover to the pressure plate. Displacement constraints are established at the reference point of the pressure plate, constraining five degrees of freedom: 1, 2, 4, 5, and 6.
[0068] S400: Analysis step. Specifically, create an analysis step with a 50N load, using static analysis and enabling the geometric nonlinearity switch (Nlgeom). Set the initial increment to 0.1, the total analysis time to 1.0, and apply a 50N load in CLOAD-Force. Do not define a specific load value in Define, and select New in the OP option of Parameter to unload the 50N load from the previous step.
[0069] S500: Output settings. Specifically, establish the field output, check Node output and Element output, and set the time interval to 0.1. Node output outputs the deformation (displacement) of the horn cover, and Element output outputs the stress and yield strain (PEEQ).
[0070] S600: Evaluate the stiffness of the horn cover. Stiffness is a physical quantity that measures the horn cover's resistance to deformation. Specifically, it is evaluated from two dimensions: first, the amount of deformation of the horn cover after loading; and second, whether the deformation of the horn cover can recover after unloading. If the displacement of the horn cover after loading is less than 1mm, the displacement and yield strain after unloading should be zero. If the evaluation results do not meet the above criteria, the dimension H of the first support 211 can be increased, and then the model can be re-modeled and CAE simulation can be performed until the horn cover meets the evaluation criteria.
[0071] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A speaker cover, characterized in that, include: A cover having multiple sound-permeable holes; The bracket has a support body for abutting against the cover. The support body includes a plurality of spaced-apart first support portions. A gap is formed between two adjacent first support portions along the arrangement direction of the first support portions. The ratio of the area of the gap to the area of the support body is greater than the ratio of the area of the sound-permeable hole to the area of the cover.
2. The speaker cover according to claim 1, characterized in that, The first support portion is annular, and multiple first support portions are arranged around the same center point and are arranged at radial intervals along the first support portion.
3. The speaker cover according to claim 2, characterized in that, The sound-permeable hole is an arc-shaped hole, and the extension direction of the arc-shaped hole is parallel to the circumference of the first support part. Along the contact direction between the support body and the cover body, the arc-shaped hole is aligned with the gap between two adjacent first support parts.
4. The speaker cover according to claim 2, characterized in that, The support body further includes a second support portion, the extension direction of the second support portion being parallel to the radial direction of the first support portion, and the second support portion being connected to each of the first support portions respectively.
5. The speaker cover according to claim 4, characterized in that, The support body further includes a third support portion, the extension direction of which is parallel to the radial direction of the first support portion. Along the radial direction of the first support portion, the size of the third support portion is smaller than the size of the second support portion, so that the third support portion is connected to a portion of the first support portion. Along the circumference of the first support portion, the third support portion and the second support portion are alternately arranged.
6. The speaker cover according to any one of claims 1-5, characterized in that, The ratio between the dimension of the first support portion in the arrangement direction of the first support portion and the dimension in the abutment direction of the support body and the cover body is greater than 0.6 and less than 1.
7. The speaker cover according to claim 6, characterized in that, Along the arrangement direction of the first support portion, the size of the first support portion is less than or equal to 2.5 mm.
8. The speaker cover according to any one of claims 1-5, characterized in that, Along the arrangement direction of the first support, the size of the gap between two adjacent first support portions is greater than or equal to 10 mm and less than or equal to 20 mm.
9. A sound-generating device, characterized in that, include: Sound unit, The speaker cover according to any one of claims 1-8, wherein the speaker cover is disposed on the outside of the sound-generating unit.
10. A vehicle, characterized in that, include: Body; The sound-generating device of claim 9, wherein the sound-generating device is mounted on the vehicle body.