Noise reduction front mask and car thereof

Abstract

The present application relates to a noise-reducing front mask and a vehicle thereof, comprising: a front mask body and a noise reduction unit, the front mask body being configured to be disposed on a cab; the noise reduction unit being connected to the front mask body, and the noise reduction unit being configured such that the noise reduction unit is disposed between a noise source in the cab and the front mask body, and the area of ​​the noise reduction unit is larger than the noise region of the noise source in the cab. The present invention utilizes the fact that sound propagates in the air as longitudinal waves and is reflected upon encountering obstacles. The noise reduction unit is disposed between the noise source in the cab and the front mask body, and the area of ​​the noise reduction unit is configured to be larger than the noise region. The noise reduction unit rapidly absorbs and attenuates sound energy, thereby preventing sound waves from reflecting back and forth (or even resonating) within the cavity formed by the front panel of the vehicle body and the front mask body, thereby resolving the problem of noise from the front panel of a commercial vehicle penetrating into the cab.

Description

Technical Field

[0001] The present application relates to the field of automobile noise reduction, and in particular to a noise reduction front mask and automobile thereof. Background Art

[0002] The back of the front hood of existing commercial vehicles is a simple flat plate structure with localized reinforcement ribs. These ribs are designed to increase rigidity but have no noise reduction effect. The commercial vehicle's engine is located at the bottom of the vehicle body, behind the front hood. During the transmission process, engine noise will reach the cavity formed by the front hood and the front panel. Because the back of the front hood has no noise reduction function, the noise energy cannot be absorbed and can only enter the cab through the front panel (the front panel requires holes for mounting components). At the same time, the mounting parts on the front panel, such as the wiper motor, brake valve, and air conditioning ducts, generate vibration noise and electromagnetic noise. In the absence of noise reduction measures, the noise is also transmitted into the cabin, seriously affecting comfort. Summary of the Invention

[0003] The present application provides a noise-reducing front cover and a vehicle thereof, which can solve the problem in the related art that no noise reduction measures are provided on the front cover, and engine noise and mounting noise are transmitted into the interior of the cab.

[0004] In a first aspect, an embodiment of the present application provides a noise-reducing front mask, comprising: a front mask body and a noise reduction unit, wherein the front mask body is used to be arranged on a cab; the noise reduction unit is connected to the front mask body, and the noise reduction unit is configured as follows: the noise reduction unit is used to be arranged between the noise source of the cab and the front mask body, and the area of ​​the noise reduction unit is larger than the noise area of ​​the noise source of the cab.

[0005] In some embodiments, the noise reduction unit includes a first noise reduction component and a second noise reduction component; the first noise reduction component and the second noise reduction component are both connected to the front mask body, and the first noise reduction component can absorb the first noise, and the second noise reduction component can absorb the second noise, and the frequency of the first noise and the frequency of the second noise are different.

[0006] In some embodiments, the first noise reduction component includes: a first porous thin plate and a porous sponge wedge, the first porous thin plate is connected to the front mask body; the porous sponge wedge is arranged between the first porous thin plate and the front mask body, and is connected to the front mask body.

[0007] In some embodiments, a plurality of first sound-absorbing holes are provided on the first porous thin plate; a plurality of wedges are provided on the porous sponge wedge; the wedges correspond to the first sound-absorbing holes, and the central axis of the corresponding first sound-absorbing holes and the central axis of the wedge of the porous sponge wedge are in the same vertical plane; there is a gap between the bottom end of the first porous thin plate and the top end of the wedge of the porous sponge wedge.

[0008] In some embodiments, the ratio of the gap size between the bottom end of the first porous thin plate and the top end of the porous sponge wedge to the wedge height size of the porous sponge wedge is within a first set threshold range; the wedge includes two inclined surfaces, the angle between the two inclined surfaces is an acute angle, and the angle between two adjacent wedges is an acute angle.

[0009] In some embodiments, the second noise reduction component includes: a second porous thin plate and a hard polyhedron, the second porous thin plate is connected to the front mask body; the hard polyhedron is arranged between the second porous thin plate and the front mask body, and is connected to the front mask body.

[0010] In some embodiments, a second sound-absorbing hole is provided on the second porous thin plate, a resonance cavity is provided on the hard polyhedron, and the central axis of the second sound-absorbing hole coincides with the central axis of the resonance cavity; and the ratio of the diameter of the inscribed circle of the resonance cavity to the diameter of the inscribed circle of the second sound-absorbing hole is within a second set threshold range.

[0011] In some embodiments, the noise reduction front mask further includes a water guide unit, the noise reduction unit is provided with a sound absorbing hole, the water guide unit includes a water guide ring, the water guide ring is fixed on the noise reduction unit and is coaxially arranged with the sound absorbing hole.

[0012] In some embodiments, a partition structure is provided on the front mask body, and the partition structure includes a plurality of longitudinal partitions spaced apart on the front mask body and a plurality of transverse partitions spaced apart on the front mask body, so as to divide the front mask body into a plurality of accommodating intervals; the noise reduction unit includes a plurality of small noise reduction units, and a small noise reduction unit is provided in each accommodating interval; one end of the small noise reduction unit is in contact with the wall surface of the front mask body, and the other end is fixed to the partition structure through a connecting member; the ratio of the length of the noise reduction unit to the length of the noise area is within the third set threshold interval, and the ratio of the width of the noise reduction unit to the width of the noise area is within the fourth set threshold interval, and the minimum value of the third set threshold interval and the minimum value of the fourth set threshold interval are both greater than 1.

[0013] In a second aspect, an embodiment of the present application provides a car, comprising: the noise reduction front mask as described above.

[0014] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0015] An embodiment of the present application provides a noise-reducing front mask and a vehicle thereof, utilizing the characteristics that sound propagates in the air in the form of longitudinal waves and will be reflected when encountering obstacles. A noise reduction unit is set between the noise source in the cab and the front mask body, and the area of ​​the noise reduction unit is set to be larger than the area of ​​the noise area. The noise reduction unit quickly absorbs and weakens the sound energy, so that the sound waves cannot be reflected back and forth (or even resonate) in the cavity formed by the front panel of the vehicle body and the front mask body, thereby solving the problem of noise from the front panel of a commercial vehicle penetrating into the cab. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A schematic diagram of a car noise source provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram comparing the area of ​​the noise reduction unit and the area of ​​the noise region provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of a first noise reduction component provided in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of a first noise reduction component provided in an embodiment of the present application;

[0021] Figure 5 A schematic diagram showing the connection between the noise reduction unit and the front mask body provided in an embodiment of the present application;

[0022] Figure 6 A schematic diagram of a first noise reduction component provided in an embodiment of the present application;

[0023] Figure 7 for Figure 6 Cross-sectional view at AA in the middle;

[0024] Figure 8 A schematic diagram showing the dimensions of the first noise reduction component provided in an embodiment of the present application;

[0025] Figure 9 A schematic diagram of noise reduction of the first noise reduction component provided in an embodiment of the present application;

[0026] Figure 10 A schematic diagram of a second noise reduction component provided in an embodiment of the present application;

[0027] Figure 11A schematic diagram of a second noise reduction component provided in an embodiment of the present application;

[0028] Figure 12 A schematic diagram of a hard polyhedron provided in an embodiment of the present application;

[0029] Figure 13 A schematic diagram of a hard polyhedron provided in an embodiment of the present application;

[0030] Figure 14 A schematic cross-sectional view of the second noise reduction assembly and the front mask body provided in an embodiment of the present application;

[0031] Figure 15 A schematic diagram showing the dimensions of the second noise reduction component provided in an embodiment of the present application;

[0032] Figure 16 A schematic diagram of noise reduction of the second noise reduction component provided in an embodiment of the present application.

[0033] In the figure: 1. Front mask body; 10. Partition structure; 11. Threaded hole; 12. Bolt member; 13. Embedded bolt; 2. First noise reduction component; 20. First porous sheet; 200. First sound-absorbing hole; 21. Porous sponge wedge; 3. Second noise reduction component; 30. Hard polyhedron; 300. Resonance cavity; 31. Second porous sheet; 310. Second sound-absorbing hole; 4. Water guide unit; 40. Water guide ring; 5. Cab; 6. Noise area; 7. Noise source of front panel component; 8. Engine noise source. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] See also Figures 1 to 16 The embodiment of the present application provides a noise-reducing front cover and a vehicle thereof, which can solve the problem in the related art that no noise reduction measures are set on the front cover, and the engine noise and the noise of the mounting parts will be transmitted to the interior of the cab.

[0036] An embodiment of the present application provides a noise-reducing front mask, which includes: a front mask body 1 and a noise reduction unit, wherein the front mask body 1 is used to be set on the cab 5; the noise reduction unit is connected to the front mask body 1, and the noise reduction unit is configured as follows: the noise reduction unit is used to be set between the noise source of the cab 5 and the front mask body 1, and the area of ​​the noise reduction unit is larger than the area of ​​the noise area 6 of the noise source of the cab 5.

[0037] In the present application, utilizing the characteristics that sound propagates in the air in the form of longitudinal waves and will be reflected when encountering obstacles, a noise reduction unit is set between the noise source of the cab 5 and the front cover body 1, and the area of ​​the noise reduction unit is set to be larger than the area of ​​the noise region 6 of the noise source of the cab 5. The sound energy is quickly absorbed and weakened by the noise reduction unit, so that the sound waves cannot be reflected back and forth (or even resonate) in the cavity formed by the front panel of the vehicle body and the front cover body 1, thereby solving the problem of noise from the front panel of the commercial vehicle penetrating into the cab 5.

[0038] See also Figure 1 As shown, in this application, the noise sources of the cab 5 include a front panel noise source 7 and an engine noise source 8. The front mask body 1 is arranged at the front of the vehicle, and a noise reduction unit is arranged on the side of the front mask body 1 close to the front of the vehicle so that the noise energy can be absorbed by the noise reduction unit.

[0039] Furthermore, in this application, the positions and frequencies of the front panel noise source 7 and the engine noise source 8 are different, so corresponding noise reduction components can be designed so that the same front cover body 1 can match different engine and chassis requirements and can match components with different sound characteristics.

[0040] Therefore, based on the above embodiment, in this embodiment, the noise reduction unit includes a first noise reduction component 2 and a second noise reduction component 3 .

[0041] The first noise reduction component 2 and the second noise reduction component 3 are both connected to the front mask body 1, and the first noise reduction component 2 can absorb the first noise, and the second noise reduction component 3 can absorb the second noise, and the frequency of the first noise is different from the frequency of the second noise.

[0042] In the above, the first noise reduction component 2 can absorb the first noise and the second noise reduction component 3 can absorb the second noise, which means that the first noise reduction component 2 mainly absorbs the first noise and the second noise reduction component 3 mainly absorbs the second noise. Specifically, the noise reduction unit can be designed with different structures according to the frequency band differences of the sound source. If the sound source is mainly in the mid-to-high frequency band, the first noise reduction component 2 is selected; if the sound source is mainly in the low frequency band, the second noise reduction component 3 is selected; that is, the first noise is a sound source in the mid-to-high frequency band, and the second noise is a sound source in the low frequency band.

[0043] The first noise reduction component 2, through its specific structural design, can more effectively absorb or reduce noise in the mid- and high-frequency bands. This targeted design means that the first noise reduction component 2 can significantly reduce mid- and high-frequency noise without excessively affecting sounds in other frequency bands. Similarly, the second noise reduction component 3 can more effectively absorb or reduce low-frequency noise. This design enables the second noise reduction component 3 to effectively reduce low-frequency noise without interfering with other sounds. By assigning noise reduction tasks to specially designed components, the efficiency of the overall noise reduction unit can be significantly improved. Both the first noise reduction component 2 and the second noise reduction component 3 are optimized for their specific frequency ranges and can therefore more efficiently handle noise within that range.

[0044] On the basis of the above embodiment, in this embodiment, a partition structure 10 is provided on the front mask body 1, and the partition structure 10 includes a plurality of longitudinal partitions spaced apart on the front mask body 1 and a plurality of transverse partitions spaced apart on the front mask body 1, so as to divide the front mask body 1 into a plurality of accommodating intervals.

[0045] In this embodiment, by providing a baffle structure 10 on the front mask body 1, the overall structural strength and rigidity of the front mask body 1 are enhanced, making the front mask body 1 more resistant to external impact and deformation, thereby extending its service life. Furthermore, the baffle structure 10 divides the front mask body 1 into multiple accommodating compartments, facilitating the layout and installation of different functional modules. Furthermore, the noise reduction unit comprises multiple small noise reduction units, one in each accommodating compartment. This makes it easier to maintain the noise reduction units in each accommodating compartment, allowing for targeted maintenance of different accommodating compartments.

[0046] In this embodiment, the noise reduction unit may be the first noise reduction component 2 or the second noise reduction component 3, and is specifically configured according to the noise frequency band.

[0047] That is to say, the noise reduction unit can be used as the first noise reduction component 2 or the second noise reduction component 3 according to the noise frequency band characteristics in the actual application scenario. When the setting position of the noise reduction unit is close to the mid- and high-frequency band noise, the noise reduction unit can be configured as the first noise reduction component 2, and its specific noise reduction structure can be used to effectively attenuate the noise in the mid- and high-frequency bands; and when the setting position of the noise reduction unit is close to the low-frequency noise, it can be adjusted to the second noise reduction component 3, and adopt another set of structures and materials that are more suitable for low-frequency noise attenuation. This design enables the noise reduction unit to achieve precise noise reduction according to the actual noise conditions, thereby achieving the best noise control effect.

[0048] Furthermore, the ratio of the length of the noise reduction unit to the length of the noise area 6 is within the third set threshold interval, the ratio of the width of the noise reduction unit to the width of the noise area 6 is within the fourth set threshold interval, and the minimum value of the third set threshold interval and the minimum value of the fourth set threshold interval are both greater than 1.

[0049] It should be noted that the noise reduction unit length here refers to the sum of the lengths of multiple noise reduction small units, and the noise reduction unit width refers to the sum of the widths of multiple noise reduction small units.

[0050] See also Figure 2 As shown, the noise reduction unit length is L4, the noise reduction unit width is L5, the noise region 6 length is L7, and the noise region 6 width is L6. That is, the ratio of L4 to L7 is within the third set threshold range, and the ratio of L5 to L6 is within the fourth set threshold range. Because the minimum values ​​of the third set threshold range and the fourth set threshold range are both greater than 1, the noise reduction unit length must be greater than the length of the noise region 6, and the noise reduction unit width must be greater than the width of the noise region 6. In this embodiment, the third set threshold range is set to 2-2.5, and the fourth set threshold range is set to 2-2.5. In other embodiments, these values ​​can be adjusted based on actual conditions.

[0051] On the basis of the above embodiment, in this embodiment, the first noise reduction component 2 includes: a first porous thin plate 20 and a porous sponge wedge 21 .

[0052] One end of the noise reduction unit is attached to the wall of the front mask body 1, and the other end is fixed to the partition structure 10 via a connector. In this embodiment, the first porous sheet 20 is connected to the front mask body 1; the porous sponge wedge 21 is disposed between the first porous sheet 20 and the front mask body 1 and is connected to the front mask body 1.

[0053] See also Figure 4 、 Figure 7 and Figure 8 As shown, the porous sponge wedge 21 is attached to the wall of the front mask body 1 and fixed by adhesive. In this embodiment, the connecting members include embedded bolts 13 and bolt members 12. The embedded bolts 13 are embedded in the longitudinal partition or the transverse partition, and can also be set at the intersection of the longitudinal and transverse partitions. The first porous sheet 20 is set at the top of the longitudinal and transverse partitions, and the bolt members 12 pass through the first porous sheet 20. After the bolt members 12 are screwed together with the embedded bolts 13, the first porous sheet 20 is fixed to the partition structure 10.

[0054] Alternatively, a threaded hole 11 can be opened at the intersection of the longitudinal partition or the transverse partition, and the first porous thin plate 20 is arranged at the top of the longitudinal partition and the transverse partition, and the first porous thin plate 20 is penetrated by a bolt member 12. After the bolt member 12 is screwed into the threaded hole 11, the first porous thin plate 20 is fixed to the partition structure 10.

[0055] Furthermore, a sealing structure is provided between the contact positions of the first porous thin plate 20 and the partition structure 10. The sealing structure may be a closed-cell sponge to improve the sealing performance of the connection and the noise reduction efficiency.

[0056] Furthermore, the first porous sheet 20 is provided with a plurality of first sound-absorbing holes 200; the porous sponge wedge 21 is provided with a plurality of wedges. Figure 4 As shown, a plurality of wedges are arranged on the porous sponge wedge 21. When the first porous sheet 20 and the porous sponge wedge 21 in the same first noise reduction component 2 are installed on the accommodation interval, the wedges correspond to the first sound absorbing holes 200, and refer to Figure 8 As shown, the central axis of the corresponding first sound-absorbing hole 200 and the central axis of the porous sponge wedge 21 are aligned in the same vertical plane. This optimizes the propagation path of sound waves and further enhances the noise reduction performance of the first noise reduction component 2. Furthermore, a gap is provided between the bottom end of the first porous sheet 20 and the top end of the porous sponge wedge 21. This gap, on the one hand, causes more reflection and scattering of sound waves as they pass through the first noise reduction component 2, thereby increasing the contact area between the sound waves and the first noise reduction component 2 and improving sound absorption efficiency. Furthermore, the presence of this gap can also mitigate the impact of sound waves on the first noise reduction component 2 to a certain extent, extending the service life of the first noise reduction component 2.

[0057] Furthermore, in this embodiment, in order to improve the noise reduction effect, the ratio of the gap size between the bottom end of the first porous thin plate 20 and the top end of the porous sponge wedge 21 to the wedge height size of the porous sponge wedge 21 is set within the first set threshold range, that is, the ratio of the gap size between the bottom end of the first porous thin plate 20 and the top end of the porous sponge wedge 21 to L3 is within the first set threshold range. In this embodiment, the first set threshold range can be set to 1 / 4-1 / 3. It should be noted that the first set threshold range can be fine-tuned according to different application scenarios and noise characteristics to achieve the best noise reduction effect.

[0058] Furthermore, the wedge includes two inclined surfaces, and the angle between the two inclined surfaces is set to be an acute angle, and the angle between two adjacent wedges is also an acute angle. In this embodiment, the angle between the two inclined surfaces is set to be the same as the angle between two adjacent wedges, and the angle range is 30°-60°.

[0059] See also Figure 9 As shown, the acute angle design causes the sound waves to be reflected multiple times between the two inclined surfaces when passing through the wedge structure. This multiple reflection not only increases the contact area between the sound wave and the porous sponge wedge 21, but also causes the energy of the sound wave to gradually dissipate during the propagation process, thereby achieving a better noise reduction effect. When the sound wave encounters this structure, it will be dispersed in multiple directions, thereby reducing the concentration and reflection of the sound wave in a specific direction, further reducing the propagation of noise and the generation of echoes. At the same time, when the sound wave hits the inclined surface, part of the sound wave energy will be converted into heat energy or other forms of energy and dissipated, thereby reducing the propagation intensity of the sound wave. This efficient sound absorption performance helps to achieve better noise reduction effects in various noisy environments. In addition, the acute angle design also enhances the stability of the porous sponge wedge 21 structure. Such a structure is more able to withstand external pressure and vibration, thereby ensuring the long-term stability and reliability of the first noise reduction component 2.

[0060] On the basis of the above embodiment, in this embodiment, the second noise reduction component 3 includes: a second porous thin plate 31 and a hard polyhedron 30 .

[0061] Since one end of the noise reduction unit is in contact with the wall of the front mask body 1 and the other end is fixed to the partition structure 10 via a connector, in this embodiment, the second porous sheet 31 is connected to the front mask body 1; the hard polyhedron 30 is disposed between the second porous sheet 31 and the front mask body 1 and is connected to the front mask body 1.

[0062] See also Figure 11 、 Figure 14 and Figure 16 As shown, the rigid polyhedron 30 is bonded to the wall of the front mask body 1 and secured thereto via adhesive. In this embodiment, the connectors include embedded bolts 13 and bolt members 12. The embedded bolts 13 are embedded within the longitudinal or transverse partitions, or can be located at the junction of the longitudinal and transverse partitions. A second porous sheet 31 is disposed at the top of the longitudinal and transverse partitions, and is penetrated by bolt members 12. After the bolt members 12 are threadedly engaged with the embedded bolts 13, the second porous sheet 31 is secured to the partition structure 10.

[0063] Alternatively, a threaded hole 11 may be opened at the junction of the longitudinal partition or the transverse partition, and the second porous thin plate 31 may be arranged at the top of the longitudinal partition and the transverse partition, and the second porous thin plate 31 may be penetrated by a bolt member 12. After the bolt member 12 is screwed into the threaded hole 11, the second porous thin plate 31 is fixed to the partition structure 10.

[0064] Furthermore, a sealing structure is provided between the contact positions of the second porous thin plate 31 and the partition structure 10 . The sealing structure may be a closed-cell sponge to improve the sealing performance of the connection and the noise reduction efficiency.

[0065] Furthermore, a second sound-absorbing hole 310 is provided on the second porous thin plate 31, and a resonance cavity 300 is provided on the hard polyhedron 30. When the second porous thin plate 31 and the hard polyhedron 30 in the same second noise reduction component 3 are installed in the accommodating interval, the central axis of the second sound-absorbing hole 310 coincides with the central axis of the resonance cavity 300.

[0066] In the present application, by aligning the central axis of the second sound-absorbing hole 310 with the central axis of the resonance cavity 300, sound waves can enter the resonance cavity 300 more directly and efficiently. This design reduces the energy loss of sound waves during propagation and improves the interaction efficiency between the sound waves and the resonance cavity 300. The resonance cavity 300 is designed to resonate with sound waves of a specific frequency, thereby consuming the sound wave's energy and achieving the purpose of noise reduction. When the central axis of the sound wave coincides with the central axis of the resonance cavity 300, the sound wave can interact more fully with the resonance cavity 300, enhancing the resonance noise reduction effect. The second sound-absorbing hole 310 on the second porous sheet 31 not only provides a channel for sound waves to enter the resonance cavity 300, but also has certain sound absorption properties. When sound waves pass through the second sound-absorbing hole 310, they interact with the microstructures within the second porous sheet 31, resulting in the dissipation of the sound wave energy. This sound absorption performance, combined with the noise reduction effect of the resonance cavity 300, further improves the overall noise reduction performance.

[0067] For further information, see Figure 16 As shown, the ratio of the inscribed circle diameter of the resonance cavity 300 to the inscribed circle diameter of the second sound absorbing hole 310 is within the second set threshold range. The ratio of the inscribed circle diameter d2 of the resonance cavity 300 to the inscribed circle diameter d1 of the second sound absorbing hole 310 is set to be between 1.5-2.

[0068] By adjusting the ratio of d2 to d1, the resonant frequency of the resonance cavity 300 can be controlled to a certain extent, better matching the desired noise frequency. A ratio between 1.5 and 2 helps optimize the resonant frequency, thereby enhancing the noise reduction effect. The second sound-absorbing hole 310 serves as a channel for sound waves to enter the resonance cavity 300. Its diameter d1 has a significant impact on the transmission and absorption of sound waves. When the ratio of d2 to d1 is moderate, sound waves can more smoothly pass through the second sound-absorbing hole 310 into the resonance cavity 300 and resonate within the resonance cavity 300, thereby more effectively dissipating the sound wave energy.

[0069] Based on the above embodiment, in this embodiment, the noise reduction front mask further includes a water guide unit 4, the noise reduction unit is provided with a sound absorbing hole, the water guide unit 4 includes a water guide ring 40, the water guide ring 40 is fixed on the noise reduction unit and is coaxially arranged with the sound absorbing hole.

[0070] Specifically, in the present application, a water guide ring 40 is provided on the first porous thin plate 20 in the first noise reduction component 2, and the water guide ring 40 is coaxially arranged with the first sound absorbing hole 200; a water guide ring 40 is also provided on the second porous thin plate 31 in the second noise reduction component 3, so that the water guide ring 40 thereon is coaxially arranged with the second sound absorbing hole 310.

[0071] Among them, the main function of the water guide ring 40 is to guide the water flow. When water droplets or water flow contacts the first porous thin plate 20 and the second porous thin plate 31 of the noise reduction unit, the water guide ring 40 can ensure that the water flow flows along a specific path instead of randomly spreading to other parts of the first porous thin plate 20 and the second porous thin plate 31 or the first sound-absorbing hole 200 and the second sound-absorbing hole 310, thereby preventing moisture from eroding and damaging the internal structure of the noise reduction unit and ensuring that the noise reduction unit maintains its noise reduction performance.

[0072] In summary, the present invention employs a noise reduction unit designed on the front cover body 1 to absorb noise energy within the cavity between the front panel and the front cover body 1, reducing the amount of noise transmitted into the interior, thereby reducing noise near the driver's ears. The back of the front cover body 1 is further divided into several noise reduction units. Corresponding noise reduction components are designed based on the location and frequency of the noise source, allowing the same cab 5 and front cover to be compatible with different engine and chassis requirements and components with different acoustic characteristics. The noise reduction unit structure can be designed differently based on the frequency range of the sound source. If the sound source is primarily in the mid-to-high frequency range, the first noise reduction component 2 is selected; if the sound source is primarily in the low frequency range, the second noise reduction component 3 is selected. This rapidly absorbs and attenuates sound energy (converting it into heat), preventing sound waves from reflecting back and forth within the cavity formed by the front panel and the front cover body 1, or even resonating. This solves the problem of noise from the front panel penetrating into the interior. Using a front cover body with a noise reduction unit reduces interior noise by approximately 0.6 to 1.0 decibels.

[0073] In a second aspect, an embodiment of the present application provides a car, which includes: a noise reduction front mask provided by any of the above embodiments of the present application.

[0074] In the present application, the characteristic that sound propagates in the air in the form of longitudinal waves and will be reflected when encountering obstacles is utilized, and a noise reduction unit is set between the noise source of the cab 5 and the front cover body 1, and the area of ​​the noise reduction unit is set to be larger than the area of ​​the noise area 6. The sound energy is quickly absorbed and weakened by the noise reduction unit, so that the sound waves cannot be reflected back and forth (or even resonate) in the cavity formed by the front panel of the vehicle body and the front cover body 1, thereby solving the problem of noise from the front panel of the commercial vehicle penetrating into the cab 5.

[0075] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0076] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0077] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A noise reduction front mask, characterized in that: It includes: A front mask body (1), the front mask body (1) being used to be arranged on a cab (5); A noise reduction unit, the noise reduction unit being connected to the front mask body (1), the noise reduction unit being configured as follows: the noise reduction unit being arranged between a noise source of the cab (5) and the front mask body (1), the area of ​​the noise reduction unit being larger than the area of ​​a noise region (6) of the noise source of the cab (5); The noise reduction unit comprises a first noise reduction component (2) and a second noise reduction component (3); The first noise reduction component (2) and the second noise reduction component (3) are both connected to the front mask body (1), and the first noise reduction component (2) can absorb a first noise, and the second noise reduction component (3) can absorb a second noise, and the frequency of the first noise and the frequency of the second noise are different; The first noise reduction component (2) comprises: A first porous thin plate (20), the first porous thin plate (20) being connected to the front mask body (1); A porous sponge wedge (21), the porous sponge wedge (21) being disposed between the first porous thin plate (20) and the front mask body (1), and being connected to the front mask body (1); The first porous thin plate (20) is provided with a plurality of first sound-absorbing holes (200); The porous sponge wedge (21) is provided with a plurality of wedges; The wedge corresponds to the first sound absorbing hole (200), and the central axis of the correspondingly arranged first sound absorbing hole (200) and the central axis of the wedge of the porous sponge wedge (21) are located on the same vertical plane; There is a gap between the bottom end of the first porous thin plate (20) and the top end of the porous sponge wedge (21); The noise reduction front mask further comprises a water guide unit (4), the noise reduction unit is provided with a sound absorbing hole, the water guide unit (4) comprises a water guide ring (40), the water guide ring (40) is fixed on the noise reduction unit and is coaxially arranged with the sound absorbing hole.

2. The noise reduction front mask according to claim 1, characterized in that: The ratio of the gap size between the bottom end of the first porous thin plate (20) and the top end of the porous sponge wedge (21) to the wedge height size of the porous sponge wedge (21) is within a first set threshold range; The wedge includes two inclined surfaces, the angle between the two inclined surfaces is an acute angle, and the angle between two adjacent wedges is also an acute angle.

3. The noise reduction front mask according to claim 1, wherein: The second noise reduction component (3) comprises: a second porous thin plate (31), the second porous thin plate (31) being connected to the front mask body (1); A hard polyhedron (30) is disposed between the second porous thin plate (31) and the front mask body (1), and is connected to the front mask body (1).

4. The noise reduction front mask according to claim 3, wherein: A second sound-absorbing hole (310) is provided on the second porous thin plate (31), a resonance cavity (300) is provided on the hard polyhedron (30), and the central axis of the second sound-absorbing hole (310) coincides with the central axis of the resonance cavity (300); The ratio of the diameter of the inscribed circle of the resonance cavity (300) to the diameter of the inscribed circle of the second sound absorbing hole (310) is within a second set threshold range.

5. The noise reduction front mask according to claim 1, characterized in that: The front mask body (1) is provided with a partition structure (10), and the partition structure (10) includes a plurality of longitudinal partitions spaced apart on the front mask body (1) and a plurality of transverse partitions spaced apart on the front mask body (1), so as to divide the front mask body (1) into a plurality of accommodating areas; The noise reduction unit includes a plurality of small noise reduction units, and a small noise reduction unit is provided in each accommodation interval; One end of the noise reduction unit is in contact with the wall surface of the front mask body (1), and the other end is fixed to the partition structure (10) via a connecting piece; The ratio of the length of the noise reduction unit to the length of the noise area (6) is within a third set threshold interval, the ratio of the width of the noise reduction unit to the width of the noise area (6) is within a fourth set threshold interval, and the minimum value of the third set threshold interval and the minimum value of the fourth set threshold interval are both greater than 1.

6. A car, characterized in that: It includes: The noise reduction front mask according to any one of claims 1 to 5.

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