Adjustable light commercial vehicle rear underrun protection device

Abstract

The invention discloses an adjustable rear underrun protection device for a light commercial vehicle, which belongs to the technical field of light commercial vehicles and comprises a cross beam for preventing the vehicle from jumping into the bottom of a frame, a plurality of groups of threaded holes arranged at equal intervals are respectively formed in two ends of one side of the cross beam, and support arms are respectively arranged at two ends of one side of the cross beam. The ends, close to the cross beam, of the two sets of supporting arms are connected with threaded holes in the corresponding sides of the cross beam through detachable parts, the ends, away from the cross beam, of the two sets of supporting arms are connected with the frame through connecting parts, the distance between the two sets of supporting arms can be adjusted by adjusting the threaded hole positions, corresponding to the surface of the cross beam, of the two sets of supporting arms, and therefore the supporting arms can adapt to frames with different outer widths; the distance between the support arms can be flexibly changed by forming multiple groups of threaded holes and adjusting the mounting positions of the two groups of support arms on the cross beam corresponding to the threaded holes, so that the rear lower part protection device can adapt to frame longitudinal beams with different outer widths, the problem that a traditional rear lower part protection device can only adapt to the width of a single frame is solved, and the universality of the device is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of light commercial vehicle technology, specifically to an adjustable rear underrun protection device for light commercial vehicles. Background Technology

[0002] Vehicles, especially freight vehicles (such as trucks), should have rear underrun protection devices that provide sufficient protection in the direction parallel to the vehicle's longitudinal axis during a rear-end collision to prevent underrunning. Rear underrun protection devices, particularly effective for rear-end collisions between small cars and trucks, can prevent the small car from underrunning the truck after the collision, reducing injuries and vehicle damage.

[0003] Currently, Chinese patent CN216580433U discloses a rear underrun protection system for commercial vehicles, including a crossbeam, a metal bracket assembly, and protective caps. The crossbeam is a one-piece hollow strip structure made of fiber-reinforced composite material through a single pultrusion process, with protective caps at both ends. The metal bracket assembly includes a left bracket assembly and a right bracket assembly. The left and right bracket assemblies are assembled in parallel on the larger end face of the same side of the crossbeam, including brackets and diagonal supports. The caps are matched and fitted to the openings at both ends of the crossbeam. This invention, by using a non-metallic, one-piece molded protective crossbeam, reduces weight by 50-60% compared to metal structural components, extends service life, improves protective performance, and significantly reduces processing costs compared to metal components.

[0004] The aforementioned rear underrun protection for commercial vehicles has some problems in actual use. It is only compatible with models with a single frame width, and the rear protection provided by the vehicle manufacturer is incompatible with the tailgate used by the manufacturer, resulting in a waste of rear protection. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustable rear underrun protection device for light commercial vehicles to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An adjustable rear underrun protection device for light commercial vehicles includes a crossbeam for preventing the vehicle from sliding into the bottom of the frame. Multiple sets of equally spaced threaded holes are provided at both ends of one side of the crossbeam. Support arms are provided at both ends of one side of the crossbeam. The ends of the two sets of support arms near the crossbeam are connected to the corresponding threaded holes on the crossbeam via detachable parts. The ends of the two sets of support arms away from the crossbeam are connected to the frame via connectors. Adjusting the threaded hole positions of the two sets of support arms on the surface of the crossbeam allows for adjustment of the distance between the two sets of support arms, thereby adapting to frames with different outer widths.

[0008] As a preferred technical solution, the detachable component includes connecting pieces that are fixedly installed on one end of each of the two sets of support arms near the crossbeam. The surface of the connecting piece is provided with connecting holes, and a fixing bolt passes through the inner cavity of each set of connecting holes. The screw of each set of fixing bolts passes through the corresponding side connecting hole and is threadedly connected to the inner cavity of the corresponding threaded hole.

[0009] As a preferred technical solution, the connector includes multiple sets of connecting holes respectively opened on the side of each set of support arms away from the crossbeam. Each set of connecting holes is provided with a connecting bolt. The thread of the connecting bolt passes through the corresponding connecting hole and is connected to the fixing hole on the corresponding side surface of the frame.

[0010] As a preferred technical solution, the support arm is L-shaped.

[0011] As a preferred technical solution, after the two sets of support arms are interchanged, the connecting holes on the side of the end away from the crossbeam are set in a corresponding manner with the mounting holes on the surface of the mounting bracket on the tail plate. The screw of each set of connecting bolts can pass through the corresponding side connecting hole and be connected with the mounting hole at the corresponding position.

[0012] As a preferred technical solution, the surface of the crossbeam, support arm, and connecting plate is coated with an anti-rust layer.

[0013] As a preferred technical solution, the crossbeam is arranged in a U-shaped cross section, and the opening of the U-shaped cross section faces the side away from the vehicle frame.

[0014] As a preferred technical solution, the outer corner of the support arm is integrally formed with a reinforcing rib, which extends along the length of the support arm, and the two ends of the reinforcing rib extend to the ends of the support arm that are close to the crossbeam and away from the crossbeam, respectively.

[0015] As a preferred technical solution, the surface of the connecting piece near the crossbeam is provided with anti-slip texture, the anti-slip texture is distributed in a grid pattern, and the anti-slip texture covers the entire surface of the connecting piece that is in contact with the crossbeam.

[0016] As a preferred technical solution, the anti-rust layer includes a zinc phosphate layer and an epoxy resin coating that are sequentially sprayed onto the surfaces of the crossbeam, the support arm and the connecting piece. The zinc phosphate layer is tightly adhered to the component substrate, and the epoxy resin coating completely covers the outside of the zinc phosphate layer.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. By opening multiple sets of threaded holes, the installation positions of the two sets of support arms on the corresponding threaded holes of the crossbeam can be adjusted, and the distance between the support arms can be flexibly changed to adapt to the longitudinal beams of the frame with different outer widths. This solves the problem that the traditional rear underrun protection device can only adapt to a single frame width, greatly improves the versatility of the device, and reduces the cost and resource consumption of designing protection devices separately for different vehicle models.

[0019] 2. The present invention, through the setting of detachable parts, and with the cooperation of connecting plates, connecting holes and fixing bolts, can achieve a stable connection between the support arm and the crossbeam, avoiding relative loosening between the two during use, and ensuring the structural stability of the protective device. At the same time, the installation position of the support arm on the crossbeam can be adjusted simply by unscrewing or tightening the fixing bolts, without the need for complicated tools or destructive operations. The operation is simple and efficient, and it is convenient for subsequent adjustments or component maintenance according to the width of the frame.

[0020] 3. This invention achieves compatibility with vehicles equipped with optional tailgates by setting up two sets of interchangeable support arms. Furthermore, after the support arms are interchanged, their connecting holes precisely correspond to the mounting holes of the tailgate mounting bracket, and can be fixed by connecting bolts. While meeting the relevant regulations for rear underrun protection, it ensures that the protective device and tailgate can be installed and used together, taking into account both safety and functional requirements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the adjustable rear underrun protection device for light commercial vehicles according to the present invention.

[0022] Figure 2 This is a schematic diagram of the connection structure between the present invention and a vehicle frame with a tailgate.

[0023] In the picture:

[0024] 100. Crossbeam; 101. Threaded hole; 102. Chassis; 103. Tailgate; 104. Bracket; 105. Mounting hole;

[0025] 200. Connecting hole; 201. Connecting piece; 202. Support arm; 203. Fixing hole; 204. Connection hole. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1-2This embodiment provides an adjustable rear underrun protection device for light commercial vehicles, including a crossbeam 100 for preventing the vehicle from sliding into the bottom of the frame 102. Multiple sets of equally spaced threaded holes 101 are respectively provided at both ends of one side of the crossbeam 100. Support arms 202 are respectively provided at both ends of one side of the crossbeam 100. The ends of both sets of support arms 202 near the crossbeam 100 are connected to the corresponding threaded holes 101 of the crossbeam 100 via detachable parts. The ends of both sets of support arms 202 away from the crossbeam 100 are connected to the frame 102 via connecting parts. The two sets of support arms 202 can be adjusted... 02 At the threaded holes 101 on the surface of the crossbeam 100, the spacing between the two sets of support arms 202 can be adjusted to adapt to the frame 102 with different outer widths. By opening multiple sets of threaded holes 101, the installation position of the two sets of support arms 202 at the corresponding threaded holes 101 on the crossbeam 100 can be adjusted, and the spacing between the support arms 202 can be flexibly changed to adapt to the longitudinal beams of the frame 102 with different outer widths. This solves the problem that traditional rear underrun protection devices can only adapt to the width of a single frame 102, greatly improves the versatility of the device, and reduces the cost and resource consumption of designing separate protection devices for different vehicle models.

[0028] The detachable component includes connecting plates 201 that are fixedly installed on one end of each of the two sets of support arms 202 near the crossbeam 100. The surface of the connecting plates 201 has connecting holes 200. Each set of connecting holes 200 has a fixing bolt passing through its inner cavity. The screw of each set of fixing bolts passes through the corresponding side connecting hole 200 and is threaded into the inner cavity of the corresponding threaded hole 101. Through the setting of the detachable component, the connection plates 201, connecting holes 200 and fixing bolts can achieve a stable connection between the support arms 202 and the crossbeam 100, avoiding relative loosening during use and ensuring the structural stability of the protective device. At the same time, the installation position of the support arms 202 on the crossbeam 100 can be adjusted simply by unscrewing or tightening the fixing bolts, without the need for complicated tools or destructive operations. The operation is simple and efficient, and it is convenient for subsequent adjustment or component maintenance according to the width of the frame 102.

[0029] The connector includes multiple sets of connecting holes 204 on the side of each support arm 202 away from the crossbeam 100. Each set of connecting holes 204 has a connecting bolt inside. The bolt thread passes through the corresponding connecting hole 204 and connects with the fixing hole 203 on the corresponding side surface of the frame 102. The multiple sets of connecting holes 204 at the end of the support arm 202 can compensate for the difference in the position of the fixing hole 203 on the surface of the frame 102 for different vehicle models. This ensures that the connector can stably connect the support arm 202 and the frame 102, further expanding the adaptability of the device to different frame 102 structures. Furthermore, the cooperation between the connecting bolts passing through the connecting holes 204 and the fixing holes 203 of the frame 102 can firmly fix the crossbeam 100 and the support arm 202 to the frame 102, preventing the protective device from shifting during vehicle operation and ensuring the reliable performance of the protective function.

[0030] Among them, the support arm 202 is L-shaped. The L-shaped design improves the structural strength and stability of the support arm 202 itself. When subjected to rear collision force, it can more reliably transmit the protective force to the frame 102, ensuring that the protective device plays an effective buffering and blocking role and guaranteeing the protective performance.

[0031] In this design, after the two sets of support arms 202 are interchanged, the connecting holes 204 on the side of the end away from the crossbeam 100 are correspondingly set with the mounting holes 105 on the surface of the mounting bracket 104 on the tailgate 103. The screw of each set of connecting bolts can pass through the corresponding side connecting hole 204 and connect with the corresponding mounting hole 105. By interchangeing the positions of the two sets of support arms 202, the adaptation to the optional tailgate 103 model is achieved. Furthermore, after the support arms 202 are interchanged, their connecting holes 204 and the mounting holes 105 of the tailgate 103 mounting bracket 104 are precisely aligned and can be fixed by connecting bolts. This not only meets the relevant regulations for rear underrun protection requirements, but also ensures that the protective device and the tailgate 103 can be installed and used together, taking into account both safety and functional requirements.

[0032] The crossbeam 100, the support arm 202, and the connecting piece 201 are all coated with an anti-rust layer. Through the setting of the anti-rust layer, the anti-rust layer can form an isolation barrier on the surface of the crossbeam 100, the support arm 202, and the connecting piece 201, effectively preventing rainwater, road sewage, dust and other corrosive substances from directly contacting the component substrate, and preventing the components from having problems such as reduced structural strength and loose connections due to rust.

[0033] Specifically, in this embodiment, the crossbeam 100 is configured with a U-shaped cross-section, and the opening of the U-shaped cross-section faces away from the frame 102. Compared with a flat plate structure, the U-shaped cross-section structure can significantly improve the bending and deformation resistance of the crossbeam 100 itself. In the event of a rear-end collision, the crossbeam 100 is less likely to bend or break due to force, and can more stably prevent rear vehicles from entering the bottom of the frame 102, further ensuring the protective performance of the protective device and reducing the risk of damage to the frame 102 and the internal structure of the vehicle from the collision.

[0034] Specifically, in this embodiment, a reinforcing rib is integrally formed on the outer side of the corner of the support arm 202. The reinforcing rib extends along the length of the support arm 202, and its two ends extend to the ends of the support arm 202 near the crossbeam 100 and away from the crossbeam 100, respectively. The reinforcing rib at the corner of the support arm 202 can effectively disperse the force at the corner, preventing the support arm 202 from cracking or breaking due to stress concentration at the corner when the vehicle is bumpy or in a collision, thus extending the service life of the support arm 202. At the same time, the reinforcing rib 202 extending along the length of the support arm 202 can further improve the overall structural strength of the support arm 202, ensuring that the support arm 202 can stably transmit the impact force on the crossbeam 100 to the frame 102 or the tailgate 103 bracket 104, thus ensuring the stability of the overall structure of the protective device.

[0035] Specifically, in this embodiment, the surface of the connecting piece 201 near the crossbeam 100 is provided with anti-slip texture. The anti-slip texture is distributed in a grid pattern and covers the entire surface of the connecting piece 201 that is in contact with the crossbeam 100. The grid pattern on the surface of the connecting piece 201 increases the friction between the connecting piece 201 and the crossbeam 100, preventing the connecting piece 201 from sliding relative to the crossbeam 100 due to vibration when the vehicle is driving on bumpy roads, thereby preventing the fixing bolts from loosening. At the same time, the anti-slip texture ensures that the connecting piece 201 and the crossbeam 100 always remain in a tight fit, ensuring the stability of the connection between the support arm 202 and the crossbeam 100, and preventing the protective effect of the protective device from being affected by loosening of the connection.

[0036] Specifically, in this embodiment, the anti-rust layer includes a zinc phosphate layer and an epoxy resin coating sequentially sprayed onto the surfaces of the crossbeam 100, the support arm 202, and the connecting piece 201. The zinc phosphate layer adheres tightly to the component substrate, while the epoxy resin coating completely covers the outer side of the zinc phosphate layer. The zinc phosphate layer forms a strong bond with the substrates of the crossbeam 100, the support arm 202, and the connecting piece 201, which not only enhances the adhesion of the subsequent epoxy resin coating but also provides preliminary anti-rust capabilities, slowing down the corrosion rate of the substrate. The outer epoxy resin coating has excellent corrosion resistance and sealing properties, effectively isolating moisture, dust, and corrosive substances in road wastewater from contacting the component substrate. This dual anti-rust structure significantly improves the component's anti-rust capability, extends the service life of the entire protective device, and reduces maintenance and replacement costs caused by component corrosion.

[0037] Working principle;

[0038] First, based on the outer width of the longitudinal beam of the frame 102 of the light commercial vehicle to be installed, the range of hole positions of the two sets of support arms 202 on the crossbeam 100 is initially determined. Then, the two sets of support arms 202 are placed at both ends of one side of the crossbeam 100, so that the connecting piece 201 of the end of the support arm 202 closest to the crossbeam 100 is in contact with the surface of the crossbeam 100. The position of the support arm 202 is adjusted so that the connecting hole 200 on the connecting piece 201 is precisely aligned with the threaded hole 101 at the target position on the crossbeam 100. At this time, the fixing bolt is taken, and its screw is passed through the connecting hole 200 of the connecting piece 201 and threadedly connected to the corresponding threaded hole 101 of the crossbeam 100. The bolt is tightened until there is no relative looseness between the support arm 202 and the crossbeam 100, thus completing the initial fixing of the two sets of support arms 202 and the crossbeam 100.

[0039] Then, align the connecting hole 204 on the support arm 202 with the fixing hole 203 on the surface of the frame 102, and take the connecting bolt, pass its screw through the connecting hole 204 and connect it to the fixing hole 203 on the frame 102 and tighten it to ensure that the support arm 202 is stably fixed to the frame 102. At this time, the entire device is installed on the ordinary frame 102 and can play the role of rear underrun protection.

[0040] If the vehicle needs to be equipped with the tailgate 103, first unscrew the original fixing bolts of the fixed support arm 202 and the crossbeam 100, remove the two sets of support arms 202 from the crossbeam 100, then swap the left and right positions of the two sets of support arms 202 and place them back on both ends of one side of the crossbeam 100. Adjust the base position to fit the tailgate 103 mounting bracket 104.

[0041] After the support arm 202 is moved and interchanged, its installation position on the crossbeam 100 is adjusted. On the one hand, the relative position of the support arm 202 and the crossbeam 100 is determined by aligning the connecting hole 200 of the connecting piece 201 with the threaded hole 101 of the crossbeam 100. On the other hand, it is necessary to ensure that the connecting hole 204 at the end of the support arm 202 away from the crossbeam 100 can be aligned with the mounting hole 105 on the surface of the mounting bracket 104 of the tail plate 103.

[0042] After confirming that the holes are aligned, re-pass the fixing bolts through the connecting hole 200 of the connecting piece 201 and the threaded hole 101 of the crossbeam 100, and tighten the bolts to fix the support arm 202 and the crossbeam 100.

[0043] At this point, remove the connecting bolt, pass its thread through the connecting hole 204 of the support arm 202, connect it to the mounting hole 105 of the tail plate 103 mounting bracket 104 and tighten it, so that the support arm 202 and the tail plate 103 bracket 104 are stably fixed.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable rear underrun protection device for light commercial vehicles, characterized in that, The system includes a crossbeam (100) for preventing vehicles from slipping into the bottom of the frame (102). The crossbeam (100) has multiple sets of equally spaced threaded holes (101) at both ends on one side. The crossbeam (100) also has support arms (202) at both ends on one side. The ends of the two sets of support arms (202) near the crossbeam (100) are connected to the corresponding threaded holes (101) of the crossbeam (100) via detachable parts. The ends of the two sets of support arms (202) away from the crossbeam (100) are connected to the frame (102) via connectors. By adjusting the positions of the threaded holes (101) on the surface of the crossbeam (100) of the two sets of support arms (202), the distance between the two sets of support arms (202) can be adjusted to adapt to frames (102) with different outer widths.

2. The adjustable rear underrun protection device for light commercial vehicles according to claim 1, characterized in that: The detachable component includes connecting pieces (201) that are fixedly installed on one end of each of the two sets of support arms (202) near the crossbeam (100). The surface of the connecting piece (201) is provided with connecting holes (200). Each set of connecting holes (200) has a fixing bolt passing through its inner cavity. The screw of each set of fixing bolts passes through the corresponding side connecting hole (200) and is threadedly connected to the inner cavity of the corresponding threaded hole (101).

3. An adjustable rear underrun protection device for light commercial vehicles according to claim 2, characterized in that: The connector includes multiple sets of connecting holes (204) respectively opened on the end side of each set of support arms (202) away from the crossbeam (100). Each set of connecting holes (204) is provided with a connecting bolt. The screw of the connecting bolt passes through the corresponding connecting hole (204) and is connected to the fixing hole (203) on the corresponding side surface of the frame (102).

4. An adjustable rear underrun protection device for light commercial vehicles according to claim 3, characterized in that: The arm (202) is L-shaped.

5. An adjustable rear underrun protection device for light commercial vehicles according to claim 4, characterized in that: After the two sets of support arms (202) are interchanged, the connecting hole (204) opened on the side of the end away from the crossbeam (100) is correspondingly set with the mounting hole (105) on the surface of the mounting bracket (104) on the tail plate (103). The screw of each set of connecting bolts can pass through the corresponding side connecting hole (204) and be connected with the mounting hole (105) at the corresponding position.

6. An adjustable rear underrun protection device for light commercial vehicles according to claim 5, characterized in that: The surfaces of the crossbeam (100), the support arm (202), and the connecting piece (201) are all coated with an anti-rust layer.

7. An adjustable rear underrun protection device for light commercial vehicles according to claim 1, characterized in that: The crossbeam (100) is arranged in a U-shaped section, and the opening of the U-shaped section faces away from the frame (102).

8. An adjustable rear underrun protection device for light commercial vehicles according to claim 4, characterized in that: The outer corner of the support arm (202) is integrally formed with a reinforcing rib. The reinforcing rib extends along the length of the support arm (202), and the two ends of the reinforcing rib extend to the ends of the support arm (202) near the crossbeam (100) and away from the crossbeam (100), respectively.

9. An adjustable rear underrun protection device for light commercial vehicles according to claim 2, characterized in that: The connecting piece (201) has anti-slip texture on the side surface near the crossbeam (100). The anti-slip texture is distributed in a grid pattern and covers the entire surface of the connecting piece (201) that is in contact with the crossbeam (100).

10. An adjustable rear underrun protection device for light commercial vehicles according to claim 6, characterized in that: The rust-proof layer includes a zinc phosphate layer and an epoxy resin coating that are sequentially sprayed onto the surfaces of the crossbeam (100), the support arm (202), and the connecting piece (201). The zinc phosphate layer is tightly adhered to the component substrate, and the epoxy resin coating completely covers the outside of the zinc phosphate layer.

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