Vehicle warning device

Abstract

The utility model discloses a vehicle warning device. The vehicle warning device comprises a shell, a sound production unit and a net cover, the sound production unit is arranged in the shell, the sound production unit comprises a vibrating diaphragm which vibrates along a vibration axis extending front and back, and the vibrating diaphragm is provided with a front face facing the front and a back face facing the back; the mesh cover covers the front surface of the vibrating diaphragm; the mesh enclosure comprises a fixing ring, a grating part and a shielding part, and the fixing ring is connected with the shell; the grating part is located between the fixing ring and the shielding part, the fixing ring surrounds the grating part, the grating part surrounds the shielding part, and the grating part is provided with a plurality of grating holes for air circulation; a middle hole for air circulation is formed in the middle of the shielding part; and a resonant cavity for changing the sound wave direction is formed between the shielding part and the vibrating diaphragm. The vehicle warning device has high intermediate frequency sensitivity.

Description

Technical Field

[0001] The utility model belongs to the field of loudspeakers, and relates to a vehicle warning device, in particular to a vehicle warning device for an electric vehicle that can emit a pedestrian warning sound. Background Art

[0002] For new energy vehicles, such as electric vehicles, since they do not use internal combustion engines, they are quite quiet when driving at low speeds. When the vehicle is driving behind a pedestrian, the pedestrian often cannot notice the presence of the vehicle, increasing the probability of a car accident. Therefore, an external vehicle warning device is an indispensable part of new energy vehicles, which is used to emit a pedestrian warning to remind pedestrians that a vehicle is approaching. Moreover, since the external vehicle warning device is directly exposed outside the vehicle, it is easily interfered by external environmental factors. For example, the applicant's patent CN208585167U discloses a pedestrian warning device with a net cover, which can not only protect the internal components of the pedestrian warning device, but also does not affect the performance of the pedestrian warning device. However, there is still room for improvement in the sound reproduction effect of the existing pedestrian warning devices in the medium and high frequency bands, and the performance needs to be optimized.

[0003] The above information disclosed in the background art section is only used to enhance the understanding of the background of the present application. Therefore, it may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model

[0004] In view of this, the utility model provides a vehicle warning device, which has high medium-frequency sensitivity and can be used as both a pedestrian warning device and a horn.

[0005] The utility model provides a vehicle warning device, which includes a housing, a sound generating unit and a net cover. The sound generating unit is arranged in the housing. The sound generating unit includes a diaphragm that vibrates along a vibration axis extending forward and backward. The diaphragm has a front face facing forward and a back face facing backward. The net cover covers the front face of the diaphragm. The net cover includes a fixing ring, a grille part and a shielding part. The fixing ring is connected to the housing. The grille part is located between the fixing ring and the shielding part. The fixing ring surrounds the grille part. The grille part surrounds the shielding part. The grille part has a plurality of grille holes for air circulation. A middle hole for air circulation is provided in the middle of the shielding part. A resonance cavity for changing the direction of sound waves is formed between the shielding part and the diaphragm.

[0006] In a preferred embodiment, in the diameter direction of the net cover, the ratio of the total width of the shielding part to the diameter of the net cover is greater than 0.5.

[0007] In a more preferred embodiment, the ratio of the total width of the shielding part to the diameter of the net cover is 0.55 - 0.95; further preferably 0.6 - 0.8.

[0008] In a preferred embodiment, the middle hole extends along the vibration axis. The middle hole has an outwardly expanding section adjacent to the diaphragm and a uniform section farther from the diaphragm. The aperture of the outwardly expanding section gradually decreases from the rear to the front along the vibration axis, and the aperture of the uniform section is equal to the minimum aperture of the outwardly expanding section.

[0009] In a more preferred embodiment, the middle part of the diaphragm has a spherical top that arches upward. The hole wall of the outwardly expanding section is located above the spherical top, and the shape of the hole wall is a part of a spherical surface that matches the spherical top.

[0010] In a more preferred embodiment, the ratio of the aperture of the uniform section to the total width of the shielding part is less than 0.25.

[0011] In a preferred embodiment, the shielding part has an inner surface facing the front surface of the diaphragm, and the inner surface of the shielding part and the front surface of the diaphragm are parallel to each other; the shielding part has an outer surface facing forward, and the outer surface is a plane perpendicular to the vibration axis.

[0012] In a more preferred embodiment, the diaphragm has a truncated conical body, the inner surface is located above the conical body, and the inner surface is a conical surface that matches the shape of the conical body.

[0013] In a preferred embodiment, in the diameter direction of the wire mesh cover, the ratio of the total width of the grille part to the middle width of the shielding part is less than 0.25; one or more circles of grille holes are provided on the grille part.

[0014] In a preferred embodiment, the housing includes a frame and a rear cover. The magnetic drive assembly of the sound generating unit is arranged on the frame. The rear cover is connected to the frame and seals the rear end of the frame. A closed rear cavity is formed between the rear cover and the frame, and the rear cavity is communicated with the internal cavity of the sound generating unit; the sound generating unit further includes a positioning support piece. The positioning support piece is connected between the voice coil of the sound generating unit and the frame. An installation protrusion is provided on the frame, and the positioning support piece is restricted inside the installation protrusion; a card slot is provided on the frame, and the front piece of the magnetic drive assembly is stuck in the card slot; the T-shaped iron of the magnetic drive assembly has a cylindrical part extending forward, and the outer diameter of the front end part of the cylindrical part is smaller than the outer diameter of the main body of the cylindrical part, and a through hole extending forward and backward is provided on the cylindrical part.

[0015] The present utility model adopts the above scheme and has the following advantages:

[0016] The vehicle warning device of the present utility model has a shielding portion with a closed structure in the middle of the mesh cover, forming a resonance cavity between the shielding portion and the diaphragm main body (cone). Sound waves change their propagation direction in this resonance cavity and form resonance in it, enabling medium and high-frequency sound waves to propagate in a relatively broad space, and the entire sound field also changes, improving the sensitivity of medium and high frequencies (1KHz - 4KHz). Thus, it can serve as both a pedestrian warning device and a horn, saving the horn in traditional vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a top view of a vehicle warning device according to an embodiment of the present utility model.

[0019] Figure 2 It is Figure 1 a cross-sectional view taken along the line A - A in

[0020] Figure 3 It is Figure 2 a partial enlarged view of part A in

[0021] Figure 4 It is an exploded view of a vehicle warning device according to an embodiment of the present utility model.

[0022] Figure 5 It is a perspective view of a mesh cover according to an embodiment of the present utility model.

[0023] Figure 6 It is a front view of a mesh cover according to an embodiment of the present utility model.

[0024] Figure 7 It is a cross-sectional view of a mesh cover according to an embodiment of the present utility model.

[0025] Figure 8 It is a structural diagram of a vehicle warning device of the comparative example.

[0026] Figure 9 It is a frequency response curve of the vehicle warning devices of the embodiment and the comparative example.

[0027] In the above drawings,

[0028] 1. Housing; 11. Frame; 111. Hollowed-out portion; 112. Mounting protrusion; 113. Card slot; 12. Rear cover; 13. Rear cavity;

[0029] 2. Sound generating unit; 21. Diaphragm; 211. Dome top; 212. Cone; 22. Voice coil; 23. Centering washer; 24. Magnetic drive assembly; 241. T-shaped iron; 2411. Cylindrical part; 2412. Groove; 2413. Through hole; 242. Magnet; 243. Front plate;

[0030] 3. Grille; 31. Fixed ring; 32. Grating part; 321. Grating hole; 33. Shielding part; 331. Depressed part; 34. Central hole; 341. Hole wall;

[0031] 4. Resonance cavity. Detailed implementation manners

[0032] The following elaborates on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art. It should be noted here that the description of these embodiments is for helping to understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] In this article, "inner" and "outer" are defined with reference to the vibration axis (the center line of the voice coil) of the vehicle warning device. The orientation closer to the vibration axis is the inner, and vice versa. The orientation words "upper" and "lower" are intended to facilitate the understanding of the structure of the vehicle warning device by those skilled in the art and are not used to limit the orientation of the vehicle warning device after installation (for example, installed in a vehicle).

[0034] Figures 1 to 7 The drawings are drawn to actual scale. To maintain the simplicity of the specification, the scales of the various elements are not listed one by one, but the scales and positions of the various elements should be regarded as part of the content of this specification. Embodiment

[0035] This embodiment provides a vehicle warning device, specifically a pedestrian warning device installed on a new energy vehicle, which is typically an electric vehicle driven by a battery. The vehicle warning device is used to emit one or more warning sounds, including a pedestrian warning sound played to pedestrians outside the vehicle when the vehicle is driving at a low speed, and this pedestrian warning sound is an imitation of the sound of a traditional vehicle engine. The vehicle warning device is generally installed outside the vehicle compartment (such as at the vehicle bumper) to radiate sound outside the vehicle. Further, the vehicle warning device in this embodiment also has the function of a traditional horn and can emit a horn sound. Therefore, the vehicle warning device in this embodiment realizes the functions of playing the pedestrian warning sound and the horn sound through the same sound generating unit (loudspeaker).

[0036] Refer to Figures 1 to 7As shown, the vehicle warning device includes a housing 1, a sound generating unit 2, and a grille 3. The sound generating unit 2 is disposed in the housing 1, and the sound generating unit 2 is specifically a speaker. The sound generating unit 2 includes a diaphragm 21 that vibrates along a vibration axis extending in the front-rear direction, and this vibration axis ideally coincides with the center line of the voice coil 22 of the sound generating unit 2. The diaphragm 21 has a front face facing forward and a back face facing rearward. The grille 3 covers the front face of the diaphragm 21, and the traditional function of the grille 3 is to protect relatively fragile internal components such as the diaphragm 21 of the sound generating unit 2. In this embodiment, the grille 3 includes a fixing ring 31, a grille portion 32, and a shielding portion 33 that are sequentially arranged from outside to inside. The fixing ring 31 is connected to the housing 1; the grille portion 32 is located between the fixing ring 31 and the shielding portion 33, the fixing ring 31 surrounds the grille portion 32, and the grille portion 32 surrounds the shielding portion 33. The grille portion 32 has a plurality of grille holes 321 for air circulation; a middle hole 34 for air circulation is provided in the middle of the shielding portion 33. In this embodiment, a resonance cavity 4 for changing the direction of sound waves is formed between the shielding portion 33 and the diaphragm 21, and the sensitivity of sound reproduction in the mid-high frequency band can be improved by the arrangement of this resonance cavity 4.

[0037] In the diameter direction of the grille 3, the ratio of the total width of the shielding portion 33 to the diameter of the grille 3 is greater than 0.5. Refer to Figure 7 As shown, the total width of the shielding portion 33 = W1 + W2; that is, the total width of the shielding portion 33 is twice the distance between the inner and outer edges of the shielding portion 33. Preferably, the ratio of the total width of the shielding portion 33 to the diameter of the grille 3 is 0.55 to 0.95; further preferably 0.6 to 0.8.

[0038] The middle hole 34 extends along the vibration axis, and the middle hole 34 has an outwardly expanding section adjacent to the diaphragm 21 and a uniform section farther from the diaphragm 21. The aperture of the outwardly expanding section gradually decreases from the rear to the front along the vibration axis, and the aperture of the uniform section is equal to the minimum aperture of the outwardly expanding section. Specifically, the shape of the uniform section is generally cylindrical as a whole, and the outwardly expanding section is generally an outwardly expanding flared structure. Among them, the ratio of the aperture of the uniform section to the total width of the shielding portion 33 is less than 0.25; preferably 0.1 to 0.2.

[0039] Further, the middle part of the diaphragm 21 has a spherical top 211 that arches upward, the hole wall 341 of the outwardly expanding section is located above the spherical top 211, and the shape of the hole wall 341 is a part of a spherical surface that matches the spherical top 211. The hole wall 341 of the outwardly expanding section and the spherical top 211 are arranged substantially in parallel. The shielding portion 33 has an inner surface opposite to the front face of the diaphragm 21, and the inner surface of the shielding portion 33 and the front face of the diaphragm 21 are parallel to each other. The shielding portion 33 has an outer surface facing forward, and the outer surface is a plane perpendicular to the vibration axis.

[0040] In this embodiment, the diaphragm 21 has a truncated conical body 212. The inner surface of the shielding portion 33 is located above the body 212, and the inner surface is a conical surface that matches the shape of the body 212. As Figure 6 shown, the shielding portion 33 is provided with a plurality of recessed portions 331. The recessed portions 331 extend upward from the inner surface of the shielding portion 33, and while maintaining the overall inner surface as a conical surface, the volume of the resonance cavity 4 is enlarged as much as possible.

[0041] One or more circles of grille holes 321 are provided on the grille portion 32. As Figure 5 shown, in this embodiment, two circles of grille holes 321 are provided. The plurality of grille holes 321 in the outer circle are spaced at intervals in the circumferential direction of the mesh cover 3, and the plurality of grille holes 321 in the inner circle are spaced at intervals in the circumferential direction of the mesh cover 3. The grille holes 321 are spaced from each other by connecting ribs. In the diameter direction of the mesh cover 3, the ratio of the total width of the grille portion 32 to the middle width of the shielding portion 33 is less than 0.25; preferably 0.1 - 0.2.

[0042] The housing 1 specifically includes a frame 11 and a rear cover 12. The frame 11 includes an outer cylinder and a bracket fixed to the inner side of the outer cylinder. The rear cover 12 is connected to the rear end of the outer cylinder and closes the rear end of the frame 11, thereby forming a closed rear cavity 13 between the rear cover 12 and the frame 11. The sound generating unit 2 is installed on the bracket, and the outer edge of the mesh cover 3 is fixed to the upper end portion of the bracket and / or the outer cylinder, sandwiching the outer edge (suspension edge) of the diaphragm 21 between the mesh cover 3 and the frame 11. Among them, the magnetic drive assembly 24 of the sound generating unit 2 is fixedly arranged in the bracket of the frame 11, for example, by glue bonding. The magnetic drive assembly 24 specifically includes a T-iron 241, a magnet 242, and a front plate 243. A card slot 113 is provided on the frame 11, and the front plate 243 of the magnetic drive assembly 24 is stuck in the card slot 113 and the two are fixed to each other. The magnet 242 and the front plate 243 are fixedly connected, for example, by glue bonding. The T-iron 241 and the magnet 242 are fixedly connected, for example, by glue bonding. The T-iron 241 of the magnetic drive assembly 24 has a cylindrical portion 2411 extending forward, and the rear end portion (coil portion) of the voice coil 22 is inserted into the gap between the front plate 243 and the cylindrical portion 2411. Further, the outer diameter of the front end portion of the cylindrical portion 2411 is smaller than the outer diameter of the main body of the cylindrical portion, so as to have an annular groove 2412, and the rear end portion of the voice coil 22 is slidably inserted into the annular groove 2412 in the front-rear direction. A through hole 2413 extending in the front-rear direction is provided on the cylindrical portion 2411. A plurality of hollow portions 111 are provided on the bracket of the frame 11; the rear cavity 13 and the inner cavity of the sound generating unit 2 are communicated through these hollow portions 111 and the through hole 2413. Further, a short-circuit ring (copper sleeve) can be placed in the annular groove 2412, which can make the sensitivity of the sound generating unit 2 higher.

[0043] The sound generating unit 2 further includes a positioning support piece 23, which is connected between the voice coil 22 and the frame 11 of the sound generating unit 2. Further, the frame 11 is provided with a mounting protrusion 112, and the positioning support piece 23 is restricted inside the mounting protrusion 112. Specifically, the mounting protrusion 112 surrounds the positioning support piece 23 in a circle to form a circular shallow groove, and the positioning support piece 23 is disposed in the shallow groove.

[0044] As Figure 8 shown, the housing and the sound generating unit of the vehicle warning device of the comparative example are the same as those of the embodiment, and the difference lies only in the grille 3. In the comparative example, the grille adopts a traditional louver structure, and grille holes are evenly distributed on the main body of the grille.

[0045] Under the same test conditions (the sound generating unit 2 has the same specifications and the excitation signals are the same), the sound generating effects of the two vehicle warning devices of the embodiment and the comparative example were tested. The frequency response curve is as Figure 9 shown. It can be seen from the figure that in the frequency band of 1KHz to 4KHz, the average sensitivity of the frequency response curve of the vehicle warning device of the embodiment is about 9dB higher than that of the comparative example.

[0046] For the vehicle warning device of the present embodiment, the middle part of the grille 3 adopts a shielding part 33 with a closed structure, and a resonance cavity 4, that is, a Helmholtz resonance cavity, is formed between the shielding part 33 and the main body part (cone 212) of the diaphragm 21. The sound wave changes its propagation direction in the resonance cavity 4 and forms resonance in the resonance cavity 4, so that the medium and high frequency sound waves propagate in a relatively wide space, and the entire sound field also changes, improving the sensitivity of the medium and high frequencies (1KHz to 4KHz). Thus, it can also be used as a pedestrian warning device and a horn, saving the horn in a traditional vehicle.

[0047] As shown in this specification and the claims, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0048] It can be further understood that "a plurality of" in the present disclosure means two or more, and other quantifiers are similar.

[0049] It can be further understood that the terms "first", "second", etc. are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not represent a specific order or importance. In fact, the expressions such as "first" and "second" can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0050] The above embodiments are only for illustrating the technical concept and features of the present utility model, and are a preferred embodiment. The purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly, and it should not be used to limit the protection scope of the present utility model.

Claims

1. A vehicle warning device, comprising a housing, a sound generating unit and a mesh cover. The sound generating unit is disposed in the housing. The sound generating unit includes a diaphragm that vibrates along a vibration axis extending in the front-rear direction. The diaphragm has a front face facing forward and a back face facing rearward. The mesh cover covers the front face of the diaphragm. It is characterized in that, The grille includes a fixing ring, a grille part and a shielding part. The fixing ring is connected to the housing. The grille part is located between the fixing ring and the shielding part. The fixing ring surrounds the grille part, and the grille part surrounds the shielding part. The grille part has a plurality of grille holes for air circulation. A middle hole for air circulation is provided in the middle of the shielding part. A resonance cavity for changing the direction of sound waves is formed between the shielding part and the diaphragm.

2. The vehicle warning device according to claim 1, characterized in that, In the diameter direction of the grille, the ratio of the total width of the shielding part to the diameter of the grille is greater than 0.

5.

3. The vehicle warning device according to claim 2, characterized in that, The ratio of the total width of the shielding part to the diameter of the grille is 0.55 to 0.

95.

4. The vehicle warning device according to claim 1, characterized in that, The middle hole extends along the vibration axis. The middle hole has an outwardly expanding section adjacent to the diaphragm and a uniform section farther from the diaphragm. The aperture of the outwardly expanding section gradually decreases along the vibration axis from back to front, and the aperture of the uniform section is equal to the minimum aperture of the outwardly expanding section.

5. The vehicle warning device according to claim 4, wherein The middle part of the diaphragm has a spherical top that arches upward. The hole wall of the outwardly expanding section is located above the spherical top, and the shape of the hole wall is a part of a spherical surface that matches the spherical top.

6. The vehicle warning device according to claim 4, characterized in that The ratio of the aperture of the uniform section to the total width of the shielding part is less than 0.

25.

7. The vehicle warning device according to claim 1, characterized in that, The shielding part has an inner surface opposite to the front surface of the diaphragm. The inner surface of the shielding part and the front surface of the diaphragm are parallel to each other. The shielding part has an outer surface facing forward, and the outer surface is a plane perpendicular to the vibration axis.

8. The vehicle warning device according to claim 7, characterized in that, The diaphragm has a truncated conical body. The inner surface is located above the body, and the inner surface is a conical surface that matches the shape of the body.

9. The vehicle warning device according to claim 1, characterized in that, In the diameter direction of the grille, the ratio of the total width of the grille part to the middle width of the shielding part is less than 0.

25. One or more circles of grille holes are provided on the grille part.

10. The vehicle warning device according to claim 1, characterized in that, The housing includes a frame and a rear cover. The magnetic drive assembly of the sound generating unit is arranged on the frame. The rear cover is connected to the frame and seals the rear end of the frame. A closed rear cavity is formed between the rear cover and the frame, and the rear cavity is communicated with the internal cavity of the sound generating unit. The sound generating unit further includes a positioning support piece. The positioning support piece is connected between the voice coil of the sound generating unit and the frame. An installation protrusion is provided on the frame, and the positioning support piece is restricted inside the installation protrusion. A card slot is provided on the frame, and the front piece of the magnetic drive assembly is stuck in the card slot. The T-iron of the magnetic drive assembly has a cylindrical part extending forward. The outer diameter of the front end part of the cylindrical part is smaller than the outer diameter of the main body of the cylindrical part, and a through hole extending forward and backward is provided on the cylindrical part.

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