High-NVH (Noise Vibration and Harshness) performance lightweight bottom guard plate structure

Abstract

The invention discloses a high-NVH performance lightweight bottom guard plate structure which comprises a bottom guard plate body and a side rectangular plate, the side rectangular plate is fixedly connected to the side wall of the bottom guard plate body, a plurality of protective covers are installed at the bottom of the side rectangular plate, a movable rectangular plate is arranged at the top of the bottom guard plate body, and the movable rectangular plate is fixedly connected to the side wall of the bottom guard plate body. The multiple protective covers are located on the outer side of the bottom protection plate body, the inner walls of the multiple protective covers are slidably connected with six-edge limiting rings, and six-edge through grooves corresponding to the six-edge limiting rings are formed in the inner sides of the protective covers; through cooperative use of the protective cover and the hexagonal limiting ring, the hexagonal limiting ring falls down accordingly, the head of the positioning bolt can be sleeved with the hexagonal limiting ring, the protective cover can limit the positioning bolt through the hexagonal limiting ring, the situation that the positioning bolt rotates is prevented, and therefore the connection stability between the positioning bolt and a vehicle is ensured; and the phenomena of loosening and falling off of the bottom protection plate body are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive underbody shields, and particularly to a lightweight underbody shield structure with high NVH performance. Background Art

[0002] In the development process of modern automotive industry, the requirements for the comprehensive performance of automobiles are becoming increasingly stringent. As an important component applied to the bottom of vehicles such as automobiles, the lightweight underbody shield structure with high NVH performance can not only effectively reduce the noise and vibration generated during vehicle operation, improve the sound and vibration roughness performance, and create a more comfortable interior environment for the driver and passengers, but also achieve better fuel economy and handling performance by reducing its own weight, which is of great significance for improving the overall performance of the vehicle.

[0003] Currently, most of the automotive underbody shields on the market are installed and fixed at the bottom of the vehicle with multiple groups of bolts. This traditional bolt fixing method has obvious defects in practical applications. As is well known, when a vehicle is driving, it will inevitably be affected by various vibration sources such as bumps from the road surface and vibrations of the engine. For the underbody shield fixed with bolts, under the long-term action of vehicle vibrations, the bolts are extremely likely to become loose. Once the bolts become loose, the underbody shield will also become loose accordingly. If not dealt with in time, in severe cases, it may even lead to the detachment of the underbody shield. The detachment of the underbody shield will not only cause the vehicle to lose the effective protection of key chassis components (such as the engine, transmission, etc.), increasing the risk of damage to these components by foreign objects on the road surface, but also may fall onto the road during vehicle driving, posing a serious threat to the driving safety of the following vehicles.

[0004] Therefore, the present invention provides a lightweight underbody shield structure with high NVH performance. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a lightweight underbody shield structure with high NVH performance to solve the above problems.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: A lightweight bottom guard plate structure with high NVH performance, including a bottom guard plate body and a side rectangular plate. The side rectangular plate is fixedly connected to the side wall of the bottom guard plate body. A plurality of protective covers are installed at the bottom of the side rectangular plate. An active rectangular plate is arranged at the top of the bottom guard plate body. Among them, a plurality of the protective covers are all outside the bottom guard plate body. A hexagonal limiting ring is slidably connected to the inner wall of each of the plurality of protective covers. And a hexagonal through groove corresponding to the hexagonal limiting ring is opened on the inner side of the protective cover to ensure that the hexagonal limiting ring cannot rotate. A positioning bolt penetrates through the protective cover, and the hexagonal limiting ring is snap-fitted to the outside of the corresponding positioning bolt. A rectangular ring is installed at the bottom of the active rectangular plate, and a rubber damping pad for reducing resonance with the vehicle is installed at the top end of the active rectangular plate. A rectangular cover is installed on the outside of the side rectangular plate, and the rectangular ring is slidably connected to the inner wall of the rectangular cover. A plurality of the protective covers are all installed inside the rectangular cover.

[0007] Preferably, a plurality of inner sliding grooves are opened in the protective cover. A plurality of sliders are fixedly connected to the outside of the hexagonal limiting ring, and the sliders are slidably connected to the inner wall of the corresponding inner sliding groove. A return spring is installed at the top end of the hexagonal limiting ring, and the return spring abuts against the inner wall of the top end of the protective cover.

[0008] Preferably, a limiting hexagonal rod is installed on the inner wall of the top end of the protective cover. The return spring is sleeved on the outside of the limiting hexagonal rod. The limiting hexagonal rod is inserted into the inner wall of the hexagonal limiting ring. The head of the positioning bolt contacts the bottom end of the limiting hexagonal rod. A through hole is opened on the limiting hexagonal rod, and the positioning bolt is inserted into the inner wall of the through hole.

[0009] Preferably, a plurality of spherical rolling bodies are embedded at the bottom of the hexagonal limiting ring to reduce the frictional resistance and loss between the electric wrench and the hexagonal limiting ring.

[0010] Preferably, a plurality of first through holes for making way for the positioning bolts are opened on the side rectangular plate. A plurality of second through holes for making way for the positioning bolts are opened on both the active rectangular plate and the rubber damping pad. The first through holes are located below the corresponding second through holes.

[0011] Preferably, a plurality of shock-absorbing springs are installed at the bottom of the rectangular ring. A plurality of jacks are opened at the bottom of the rectangular ring. Guide sliding rods are slidably connected to the inner walls of the plurality of jacks. The shock-absorbing springs are sleeved on the outside of the corresponding guide sliding rods. And a plurality of the shock-absorbing springs and a plurality of the guide sliding rods are all installed on the inner wall of the rectangular cover.

[0012] Beneficial effects

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The invention uses a protective cover and a hexagonal limit ring in combination. When the positioning bolt is tightened on the vehicle, the wrench releases the squeeze on the hexagonal limit ring, and the hexagonal limit ring falls down, so that the hexagonal limit ring can be sleeved on the head of the positioning bolt, so that the protective cover can limit the positioning bolt through the hexagonal limit ring to prevent the positioning bolt from rotating, thereby ensuring the connection stability between the positioning bolt and the vehicle and preventing the bottom guard plate from loosening and falling off. The problem that the falling off of the bottom guard plate not only causes the vehicle to lose effective protection for key chassis components, increasing the risk of these components being damaged by foreign objects on the road surface, but also may fall onto the road during the vehicle's driving, posing a serious threat to the driving safety of the rear vehicle.

[0015] (2) The present invention, through the coordinated use of the movable rectangular plate, the rectangular ring, the side rectangular plate and the rectangular cover, enables the spacing between the side rectangular plate and the movable rectangular plate to be adjusted, thereby adjusting the tightness of the device when installed on the vehicle and selecting it for use as required. In addition, when the bottom guard plate body is accidentally hit by an object on the ground while following the vehicle, the bottom guard plate body can slide upward to make way, thereby reducing the degree of damage caused by the head-on collision between the bottom guard plate body and the object, achieving force release and improving the protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 It is a three-dimensional cross-sectional structural schematic diagram of the present invention;

[0018] Figure 3 It is a schematic diagram of the exploded structure of the bottom guard plate body and the side rectangular plate of the present invention;

[0019] Figure 4 It is a schematic diagram of the exploded structure of the movable rectangular plate and the rectangular ring in the present invention;

[0020] Figure 5 It is a three-dimensional cross-sectional enlarged structural schematic diagram of the protective cover in the present invention;

[0021] Figure 6 It is a three-dimensional enlarged structural schematic diagram of the hexagonal limiting ring and the limiting hexagonal rod in the present invention.

[0022] In the figure: 1. Bottom guard plate body; 11. Side rectangular plate; 111. First perforation; 12. Rectangular cover; 2. Protective cover; 21. Hexagonal limiting ring; 211. Slide block; 212. Spherical rolling body; 22. Positioning bolt; 23. Inner chute; 24. Return spring; 25. Limiting hexagonal rod; 251. Through hole; 3. Movable rectangular plate; 31. Rectangular ring; 311. Insertion hole; 32. Rubber shock pad; 33. Second perforation; 34. Shock-absorbing spring; 35. Guide slide bar. Detailed implementation mode

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figure 1-6 , a lightweight bottom guard plate structure with high NVH performance, including a bottom guard plate body 1 and a side rectangular plate 11. The side rectangular plate 11 is fixedly connected to the side wall of the bottom guard plate body 1. A plurality of protective covers 2 are installed at the bottom of the side rectangular plate 11, and a movable rectangular plate 3 is arranged at the top of the bottom guard plate body 1.

[0025] Among them, a plurality of protective covers 2 are all located outside the bottom guard plate body 1. A hexagonal limiting ring 21 is slidably connected to the inner wall of each of the plurality of protective covers 2, and a hexagonal through groove corresponding to the hexagonal limiting ring 21 is opened on the inner side of the protective cover 2 to ensure that the hexagonal limiting ring 21 cannot rotate. A positioning bolt 22 penetrates through the protective cover 2, and the hexagonal limiting ring 21 is snap-fitted to the outside of the corresponding positioning bolt 22.

[0026] It should be noted that the outer shape of the head of the positioning bolt 22 described in this embodiment corresponds to the inner shape of the hexagonal limiting ring 21, so that the hexagonal limiting ring 21 can limit the positioning bolt 22 to prevent rotation.

[0027] A rectangular ring 31 is installed at the bottom of the movable rectangular plate 3. A rubber shock pad 32 for reducing resonance with the vehicle is installed at the top end of the movable rectangular plate 3. A rectangular cover 12 is installed on the outside of the side rectangular plate 11. The rectangular ring 31 is slidably connected to the inner wall of the rectangular cover 12, and a plurality of protective covers 2 are all installed inside the rectangular cover 12.

[0028] It should be noted that the docking of the rectangular ring 31 and the rectangular cover 12 described in this embodiment realizes the wrapping of the outside of the side rectangular plate 11.

[0029] Specifically, the bottom guard plate body 1 is made of high-strength alloy, has high strength and achieves lightweight, and sound-absorbing cotton, such as polyester fiber cotton, glass fiber cotton and other porous materials, is added to the bottom guard plate body 1, which has a rich pore structure. After the sound wave enters the pores, it will continuously reflect and refract therein, and rub against the inside of the material, converting the sound energy into heat energy and consuming it, thereby effectively absorbing the noise. The bottom guard plate body 1 and the side rectangular plate 11 are integrated into one body, and the side rectangular plate 11 supports a plurality of protective covers 2. When in use, the screw section of the positioning bolt 22 is passed through the protective cover 2 and the movable torque After the shaped plate 3 is aligned with the position of the screw hole at the bottom of the vehicle, an electric wrench is used to cover the head of the positioning bolt 22, and at the same time, the wrench pushes the hexagonal limiting ring 21 to shrink into the protective cover 2, so that the hexagonal limiting ring 21 and the positioning bolt 22 are separated first, preventing the hexagonal limiting ring 21 from obstructing the head of the positioning bolt 22. When the positioning bolt 22 and the vehicle are tightened, the wrench releases the squeezing of the hexagonal limiting ring 21, and the hexagonal limiting ring 21 falls down, so that the hexagonal limiting ring 21 can be sleeved on the head of the positioning bolt 22, so that the protective cover 2 can be positioned on the positioning bolt 2 through the hexagonal limiting ring 21. 2 is limited to prevent the positioning bolt 22 from rotating, thereby ensuring the connection stability between the positioning bolt 22 and the vehicle, preventing the bottom guard plate body 1 from loosening and falling off, thereby solving the problem that the falling off of the bottom guard plate will not only make the vehicle lose effective protection for key chassis components such as the engine and gearbox, increase the risk of these components being damaged by foreign objects on the road, but also may fall onto the road during the vehicle's driving, posing a serious threat to the driving safety of the rear vehicle. In addition, the bottom guard plate body 1 is connected to the bottom of the vehicle through the movable rectangular plate 3, and the movable rectangular plate 3 The rubber vibration-damping pad 32 is in contact with the bottom of the vehicle. The rubber vibration-damping pad 32 has good elasticity and can convert vibration energy into elastic potential energy, reduce the vibration amplitude, and achieve high NVH performance. The connection between the rectangular ring 31 and the rectangular cover 12 enables the spacing between the side rectangular plate 11 and the movable rectangular plate 3 to be adjusted, thereby adjusting the tightness of the device when installed on the vehicle. In addition, when the bottom guard plate body 1 is accidentally hit by an object on the ground while following the vehicle, the bottom guard plate body 1 can slide upward to make way, thereby reducing the degree of damage caused by the head-on collision between the bottom guard plate body 1 and the object, thereby achieving force release.

[0030] In one embodiment of the present invention, Figure 1-Figure 6 As shown, a plurality of inner grooves 23 are provided in the protective cover 2, a plurality of sliders 211 are fixedly connected to the outside of the hexagonal limiting ring 21, the sliders 211 are slidably connected to the inner walls of the corresponding inner grooves 23, a return spring 24 is installed at the top of the hexagonal limiting ring 21, and the return spring 24 rests against the inner wall at the top of the protective cover 2.

[0031] Specifically, the protective cover 2 slides and guides the slider 211 through the inner chute 23 and limits its position, preventing the hexagonal limiting ring 21 from rotating in the protective cover 2 and avoiding the hexagonal limiting ring 21 from slipping off the bottom of the protective cover 2, ensuring the stability of use. The return spring 24 pushes down the hexagonal limiting ring 21, so that after the wrench is withdrawn, the hexagonal limiting ring 21 can slide down under the push of the return spring 24 to limit the anti-rotation of the positioning bolt 22. When the positioning bolt 22 and the hexagonal limiting ring 21 are not accurately aligned, if the positioning bolt 22 rotates due to vibration and loosening, after the positioning bolt 22 and the hexagonal limiting ring 21 reach the same angle, the hexagonal limiting ring 21 can immediately fall to complete the limiting work on the positioning bolt 22.

[0032] In an embodiment of the present invention, as Figure 1-Figure 6 shown, a limiting hexagonal rod 25 is installed on the inner wall of the top end of the protective cover 2. The return spring 24 is sleeved outside the limiting hexagonal rod 25. The limiting hexagonal rod 25 is inserted into the inner wall of the hexagonal limiting ring 21. The head of the positioning bolt 22 contacts the bottom end of the limiting hexagonal rod 25. A through hole 251 is formed on the limiting hexagonal rod 25, and the positioning bolt 22 is inserted into the inner wall of the through hole 251.

[0033] It should be noted that the outer sides of the heads of the limiting hexagonal rod 25 and the positioning bolt 22 described in this embodiment are the same.

[0034] Specifically, the limiting hexagonal rod 25 can assist the protective cover 2 to improve the anti-rotation effect on the hexagonal limiting ring 21. The limiting hexagonal rod 25 makes way for the positioning bolt 22 through the through hole 251, so that the positioning bolt 22 can reach the connection position at the bottom of the vehicle. After the positioning bolt 22 is tightened with the vehicle, the positioning bolt 22 can contact the bottom of the limiting hexagonal rod 25, and the positioning bolt 22 limits the components inside the protective cover 2 through the limiting hexagonal rod 25.

[0035] In an embodiment of the present invention, as Figure 1-Figure 6 shown, several spherical rolling bodies 212 are embedded at the bottom of the hexagonal limiting ring 21 to reduce the frictional resistance and loss between the electric wrench and the hexagonal limiting ring 21.

[0036] Specifically, when using a wrench to drive and rotate the positioning bolt 22, the hexagonal limiting ring 21 contacts the wrench through the spherical rolling bodies 212. The wrench pushes the hexagonal limiting ring 21 into the protective cover 2 to disengage from the positioning bolt 22. When the wrench drives the positioning bolt 22 to rotate, the spherical rolling bodies 212 can reduce the resistance and loss between the two, ensuring stable operation.

[0037] In an embodiment of the present invention, as Figure 1-Figure 6As shown in the figure, a plurality of first through holes 111 for making way for the positioning bolts 22 are formed in the side rectangular plate 11, and a plurality of second through holes 33 for making way for the positioning bolts 22 are formed in both the movable rectangular plate 3 and the rubber shock-absorbing pad 32. The first through holes 111 are located below the corresponding second through holes 33.

[0038] Specifically, when the positioning bolts 22 are used to install and fix the device, the positioning bolts 22 pass through the through holes 251, then through the first through holes 111 and the second through holes 33, so that the positioning bolts 22 can be docked with the screw holes at the bottom of the vehicle.

[0039] In an embodiment of the present invention, as Figure 1-Figure 6 shown, a plurality of shock-absorbing springs 34 are installed at the bottom of the rectangular ring 31. A plurality of jacks 311 are formed at the bottom of the rectangular ring 31. A guide slide rod 35 is slidably connected to the inner wall of each of the plurality of jacks 311. The shock-absorbing springs 34 are sleeved outside the corresponding guide slide rods 35, and the plurality of shock-absorbing springs 34 and the plurality of guide slide rods 35 are all installed on the inner wall of the rectangular cover 12.

[0040] It should be noted that the shock-absorbing springs 34 and the guide slide rods 35 described in this embodiment are both in the internal space of the rectangular cover 12.

[0041] Specifically, the shock-absorbing springs 34 push down the rectangular cover 12 with the rectangular ring 31 as the support base point, so that the rectangular cover 12 can drive the side rectangular plate 11 and the bottom protection plate body 1 to descend. While realizing shock absorption, the bottom protection plate body 1 can have a function of discharging force when colliding with ground objects, improving the protection effect. The guide slide rods 35 support the shock-absorbing springs 34 inside to prevent the shock-absorbing springs 34 from being subjected to excessive force and generating excessive side bending, which affects the elastic force. The guide slide rods 35 assist the rectangular cover 12 to slide-guide the rectangular ring 31, further improving the use stability.

[0042] At the same time, the content not described in detail in this specification belongs to the prior art well known to those skilled in the art.

[0043] Working principle: The bottom guard plate structure is connected to the bottom of the vehicle through the positioning bolt 22. During installation, first pass the screw section of the positioning bolt 22 through the protective cover 2 and the movable rectangular plate 3 to align it with the screw hole at the bottom of the vehicle, and use an electric wrench to operate. The wrench pushes the hexagonal limiting ring 21 to shrink into the inside of the protective cover 2, so that the hexagonal limiting ring 21 is separated from the positioning bolt 22 to prevent the hexagonal limiting ring 21 from hindering the rotation of the head of the positioning bolt 22. When the positioning bolt 22 and the vehicle are tightened, release the squeeze of the hexagonal limiting ring 21 by the wrench, and the hexagonal limiting ring 21 falls and sleeves on the head of the positioning bolt 22. The protective cover 2 uses the hexagonal limiting ring 21 to limit the positioning bolt 22 to prevent the positioning bolt 22 from rotating, thereby ensuring that the connection between the positioning bolt 22 and the vehicle is stable and avoiding the bottom guard plate body. 1 is loose and falls off, the first through hole 111 on the side rectangular plate 11, the second through hole 33 on the movable rectangular plate 3 and the rubber vibration-damping pad 32 make way for the positioning bolt 22, so that the positioning bolt 22 can smoothly pass through and dock with the screw hole at the bottom of the vehicle. The bottom guard plate body 1 of the bottom guard plate is made of high-strength alloy and added with porous materials such as polyester fiber cotton, glass fiber cotton, etc. The rich pore structure of the sound-absorbing cotton is used to make the sound waves enter the pores and continuously reflect, refract and rub against the inside of the material, converting the sound energy into heat energy and consuming it, effectively absorbing the noise. At the same time, the movable rectangular plate 3 contacts the bottom of the vehicle through the rubber vibration-damping pad 32. The rubber vibration-damping pad 32 has good elasticity and can convert the vibration energy from the vehicle into elastic potential energy, reduce the vibration amplitude, and thus achieve high NVH performance.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such 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 including 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.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lightweight underbody shield structure with high NVH performance, comprising an underbody shield body (1) and a side rectangular plate (11), the side rectangular plate (11) being fixedly connected to the side wall of the underbody shield body (1), characterized in that, A number of protective covers (2) are installed at the bottom of the side rectangular plate (11), and a movable rectangular plate (3) is arranged at the top of the bottom protection plate body (1). Among them, a number of the protective covers (2) are all located outside the bottom protection plate body (1). A hexagonal limiting ring (21) is slidably connected to the inner walls of a number of the protective covers (2), and a hexagonal through groove corresponding to the hexagonal limiting ring (21) is formed inside the protective cover (2) to ensure that the hexagonal limiting ring (21) cannot rotate. A positioning bolt (22) penetrates through the protective cover (2), and the hexagonal limiting ring (21) is snap-fitted to the outside of the corresponding positioning bolt (22); a rectangular ring (31) is installed at the bottom of the movable rectangular plate (3), and a rubber shock-absorbing pad (32) for reducing resonance with the vehicle is installed at the top end of the movable rectangular plate (3). A rectangular cover (12) is installed on the outside of the side rectangular plate (11), and the rectangular ring (31) is slidably connected to the inner wall of the rectangular cover (12). A number of the protective covers (2) are all installed inside the rectangular cover (12).

2. The lightweight underbody shield structure with high NVH performance according to claim 1, characterized in that, A number of inner sliding grooves (23) are formed inside the protective cover (2). A number of sliders (211) are fixedly connected to the outside of the hexagonal limiting ring (21), and the sliders (211) are slidably connected to the inner walls of the corresponding inner sliding grooves (23). A return spring (24) is installed at the top end of the hexagonal limiting ring (21), and the return spring (24) abuts against the inner wall of the top end of the protective cover (2).

3. The lightweight underbody shield structure with high NVH performance according to claim 2, characterized in that, A limiting hexagonal rod (25) is installed on the inner wall of the top end of the protective cover (2). The return spring (24) is sleeved on the outside of the limiting hexagonal rod (25). The limiting hexagonal rod (25) is inserted into the inner wall of the hexagonal limiting ring (21). The head of the positioning bolt (22) contacts the bottom end of the limiting hexagonal rod (25). A through hole (251) is formed on the limiting hexagonal rod (25), and the positioning bolt (22) is inserted into the inner wall of the through hole (251).

4. The lightweight underbody shield structure with high NVH performance according to claim 1, characterized in that, A number of spherical rolling bodies (212) are embedded at the bottom of the hexagonal limiting ring (21) to reduce the frictional resistance and loss between the electric wrench and the hexagonal limiting ring (21).

5. The high NVH performance lightweight underbody shield structure according to claim 1, characterized in that, A number of first through holes (111) for making way for the positioning bolts (22) are formed on the side rectangular plate (11). A number of second through holes (33) for making way for the positioning bolts (22) are formed on both the movable rectangular plate (3) and the rubber shock-absorbing pad (32). The first through holes (111) are located below the corresponding second through holes (33).

6. The high NVH performance lightweight underbody shield structure according to claim 1, characterized in that, A number of shock-absorbing springs (34) are installed at the bottom of the rectangular ring (31). A number of insertion holes (311) are formed at the bottom of the rectangular ring (31). Guide sliding rods (35) are slidably connected to the inner walls of the number of insertion holes (311). The shock-absorbing springs (34) are sleeved on the outside of the corresponding guide sliding rods (35), and a number of the shock-absorbing springs (34) and a number of the guide sliding rods (35) are all installed on the inner wall of the rectangular cover (12).

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