Fixed connection structure of automobile tow bar

Abstract

The invention discloses an automobile tow bar fixed connection structure which comprises a rear longitudinal beam, a rear longitudinal beam reinforcing plate, a tow bar body and a towing structure, the towing structure is arranged on the tow bar body, the rear longitudinal beam is of an open structure, the rear longitudinal beam reinforcing plate is arranged in the rear longitudinal beam, a tow bar mounting plate is arranged at the end of the tow bar body, and the tow bar mounting plate is arranged on the tow bar body. The rear longitudinal beam and the rear longitudinal beam reinforcing plate are provided with a group of connecting holes which are relatively used for being connected with the trailer bar mounting plate, and the rear longitudinal beam and the rear longitudinal beam reinforcing plate are fixedly connected through fasteners penetrating through the connecting holes. A group of connecting points are used for connecting and installing a vehicle body and the tow bar, the universality is high, the tow bar can be installed according to different dragging masses, enough local rigidity and strength are guaranteed, the problems of connecting point deformation and cracking caused by vibration and impact in the vehicle running process are solved, and meanwhile the safety rear collision performance is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of automobiles, and in particular to a fixed connection structure of an automobile trailer bar. Background Art

[0002] As consumers have higher and higher requirements for automobile functions, they require that automobiles not only have the function of carrying people, but also the ability to tow RVs. The trailer bar system is an indispensable key component for towing RVs. It is installed at the rear of the car to connect the towing vehicle and the towed vehicle. The existing trailer hook bar is installed by inserting the rear anti-collision beam and the energy absorption box. Because the trailer bar is a post-installation system, this installation requires professional installation by experienced personnel due to the long insertion, complex matching surface, high number of holes and corresponding precision. It is also not easy to remove.

[0003] With the rise of RVs at home and abroad, trailer RVs have gradually entered the public's field of vision with their cheap prices, larger space, and more comfortable travel experience. The existing towed vehicles have a small towing mass, which is increasingly difficult to meet the needs of consumers.

[0004] Since the trailer bar is a post-installed part, the vehicle body needs to provide a connection point that is easy to install and can tow a large mass. However, during the driving process, the vehicle body and the trailer bar assembly will be subjected to vibration and impact from the road. If the strength and durability do not meet the requirements, the body and the trailer bar assembly will be deformed, cracked, and even fall off. This will bring safety hazards. Therefore, ensuring the rigidity and strength of the connection point between the body and the trailer bar is crucial to driving safety, and it is necessary to meet the corresponding national standards, American standards and other specifications in the domestic and foreign markets to ensure the stability, reliability and safety of its quality.

[0005] For example, patent CN217730141U discloses a trailer bar mounting structure and trailer bar assembly, wherein the trailer bar mounting structure includes a reinforcement member and a connector, wherein the reinforcement member is used to be mounted on the end of the longitudinal beam of the vehicle, and the connector member is used to be connected to the trailer bar body, and the connector member includes a first connecting plate and a second connecting plate that are connected to each other and set at an angle, and the reinforcement member has a first panel and a second panel that are set at an angle, and the first connecting plate is used to be connected to the first panel, and the second connecting plate is used to be connected to the second panel through the bottom wall or side wall of the longitudinal beam. With this solution, the trailer bar body is connected through different panels of the first connecting plate and the second connecting plate reinforcement member that are angled to each other, and the reinforcement member is fixed to one end of the longitudinal beam; it cannot be quickly adjusted according to different towing masses, and its versatility is relatively poor. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a fixed connection structure of a vehicle trailer bar to achieve the purpose of stable and reliable structure and strong versatility.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] The automobile trailer bar fixed connection structure comprises a rear longitudinal beam, a rear longitudinal beam reinforcement plate, a trailer bar body and a towing structure, wherein the towing structure is arranged on the trailer bar body, the rear longitudinal beam is an open structure, the rear longitudinal beam reinforcement plate is arranged in the rear longitudinal beam, a trailer bar mounting plate is arranged at the end of the trailer bar body, and a group of connection holes corresponding to the trailer bar mounting plate are arranged on the rear longitudinal beam and the rear longitudinal beam reinforcement plate, and are fixedly connected by fasteners passing through the connection holes.

[0009] Further or preferred:

[0010] The rear longitudinal beam reinforcement plate and the rear longitudinal beam are fitted together and connected via a bolt and nut structure.

[0011] The rear longitudinal beam reinforcement plate is arranged in the rear part of the rear longitudinal beam, and the rear end of the rear part of the rear longitudinal beam is provided with a rear guard mounting end plate.

[0012] The trailer bar mounting plate includes a mounting plate upper structure and a mounting plate lower structure, an arc-shaped structure transition is provided between the mounting plate upper structure and the mounting plate lower structure, a group of connecting holes are provided on the mounting plate upper structure, and the end of the trailer bar body is connected to the mounting plate lower structure.

[0013] The opening edge of the rear longitudinal beam is provided with a flange structure connected to the floor, and a positioning reference hole is provided at the bottom of the rear longitudinal beam.

[0014] The trailer bar mounting plate is provided with a bottom connecting plate, and the bottom of the rear longitudinal beam and the bottom connecting plate are both provided with correspondingly connected bottom connecting holes.

[0015] The rear longitudinal beam is a U-shaped structure, and connection holes are arranged on the inner side wall and the outer side wall of the rear longitudinal beam.

[0016] The trailer bar body is located in front of the rear guard mounting end plate, and the trailer bar body is located below the rear longitudinal beam.

[0017] The upper part of the trailer bar mounting plate is fitted with the side surface of the rear longitudinal beam, and the bottom connecting plate is fitted with the bottom surface of the rear longitudinal beam.

[0018] The upper part and the bottom connecting plate of the trailer bar mounting plate are L-shaped structures.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The fixed connection structure of the automobile trailer bar is reasonably designed, and a group of connection points are provided for the connection and installation of the vehicle body and the trailer bar. It has strong versatility and can realize the structure of the trailer bar for towing different towing masses, ensuring sufficient local rigidity and strength, avoiding deformation and cracking of the connection points caused by vibration and impact during vehicle driving, and enhancing the safety rear-end collision performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following is a brief description of the contents and symbols in the drawings of this specification:

[0022] Figure 1 It is an isometric view of three connection points of the present invention.

[0023] Figure 2 This is an isometric view of five connection points of the present invention.

[0024] Figure 3 An isometric view of the tow bar and body assembly of the present invention.

[0025] Figure 4 It is an isometric view of the rear assembly of the trailer bar and rear longitudinal beam of the present invention.

[0026] Figure 5 It is an exploded view of the rear assembly of the trailer bar and the rear longitudinal beam of the present invention.

[0027] Figure 6 It is an isometric view of the rear part of the rear longitudinal beam of the present invention.

[0028] Figure 7 It is the overall exploded view of the rear part of the rear longitudinal beam of the present invention.

[0029] Figure 8 It is a schematic diagram of the rear longitudinal beam reinforcement plate body of the present invention.

[0030] Fig. 9 It is a schematic diagram of the rear body of the rear longitudinal beam of the present invention.

[0031] In the figure:

[0032] 1. Bolts; 2. Trailer bar mounting plate; 3. Trailer bar body; 4. Three connection points; 5. Rear part of rear longitudinal beam; 6. Rear longitudinal beam reinforcement plate; 7. Welded nut seat; 8. Bearing surface convex welding bolts; 9. Rear guard mounting end plate; 10. Trailer ball; 11. Five connection points; 12. Rear floor connecting plate; 13. Rear floor body; 14. Rear part of rear longitudinal beam assembly; 15. Trailer bar system assembly; 16. Welding point; 17. Welding. DETAILED DESCRIPTION

[0033] The specific implementation modes of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0034] like Figures 1 to 9 As shown, the automobile trailer bar fixed connection structure includes a rear longitudinal beam, a rear longitudinal beam reinforcement plate 6, a trailer bar body 3 and a towing structure. The towing structure is fixed at the middle position of the trailer bar body, and the towing structure is a trailer ball 10.

[0035] Connected to the trailer bar system assembly 15 is the rear longitudinal beam rear assembly 14, that is, the trailer bar structure is connected to the rear longitudinal beam 5; the rear rear longitudinal beam is an open structure, the rear longitudinal beam reinforcement plate 6 is arranged in the rear rear longitudinal beam, the end of the trailer bar body 3 is provided with a trailer bar mounting plate 2, and the rear longitudinal beam and the rear longitudinal beam reinforcement plate are provided with a group of connecting holes corresponding to the trailer bar mounting plate, and are fixedly connected by fasteners passing through the connecting holes.

[0036] The rear longitudinal beam reinforcement plate and the rear longitudinal beam are fitted together and connected by a bolt and nut structure. Preferably, the rear longitudinal beam reinforcement plate and the rear longitudinal beam are both U-shaped structures, and a group of welding nut seats 7 are welded on the rear longitudinal beam reinforcement plate. The welding nut seats are fixed by welding points, and the bolts pass through the rear longitudinal beam and are fixed with the welding nut seats, so that the assembly is simple and the structure is stable and reliable.

[0037] The trailer bar mounting plate 2 includes a mounting plate upper structure and a mounting plate lower structure, with an arc-shaped structural transition between the mounting plate upper structure and the mounting plate lower structure. A group of connecting holes are provided on the mounting plate upper structure, and the end of the trailer bar body is connected to the mounting plate lower structure.

[0038] The rear longitudinal beam reinforcement plate is arranged in the rear part of the rear longitudinal beam, and the rear end of the rear part of the rear longitudinal beam is provided with a rear guard mounting end plate 9; a group of bearing surface convex welding bolts 8 are fixed on the rear guard mounting end plate, and the end of the rear guard cross beam is connected to the rear guard mounting end plate; the trailer bar body is located in front of the rear guard mounting end plate, and the trailer bar body is located below the rear longitudinal beam. The trailer bar body is hidden and further limited by the rear guard mounting end plate, so the structure is reliable.

[0039] The opening edge of the rear longitudinal beam is provided with a flange structure connected to the rear floor connecting plate 12 of the rear floor body 13, and a positioning reference hole is provided at the bottom of the rear longitudinal beam. Further, the rear end of the rear longitudinal beam rear part is also provided with a welding flange, and the rear protection mounting end plate is connected to the welding flange.

[0040] Connecting holes are provided on the inner and outer walls of the rear longitudinal beam; the trailer bar mounting plate can be connected to the connecting holes on the corresponding side according to the situation; further, the upper part of the trailer bar mounting plate is a pair of connecting plates, and the pair of connecting plates are respectively connected to the inner and outer walls of the rear longitudinal beam, and the bolts pass through the mounting holes on the connecting plates and the connecting holes on the side walls of the rear longitudinal beam and are fixedly connected with the nut seats on the rear longitudinal beam reinforcement plate, so that the structure is stable and reliable.

[0041] Furthermore, a bottom connecting plate is provided on the trailer bar mounting plate, and corresponding connected bottom connecting holes are provided on the bottom of the rear longitudinal beam and the bottom connecting plate; the upper part of the trailer bar mounting plate is fitted with the side of the rear longitudinal beam, and the bottom connecting plate is fitted with the bottom surface of the rear longitudinal beam; the upper part of the trailer bar mounting plate and the bottom connecting plate are L-shaped structures; it can realize the connection of more connection points.

[0042] The automobile trailer bar fixed connection structure of the present invention is reasonably designed, a group of connection points are provided for connecting and installing the vehicle body and the trailer bar, the versatility is strong, and the structure of the trailer bar towing different towing masses can be realized, and sufficient local rigidity and strength are guaranteed to avoid deformation and cracking of the connection points caused by vibration and impact during vehicle driving, and at the same time, the safety rear collision performance is enhanced.

[0043] Preferred embodiments of the present invention are:

[0044] In the present invention, the trailer bar body and the vehicle body are connected by bolts, which is easy to install and disassemble, and can provide two to five connection points on one side for the trailer bar to choose and use, so as to meet different towing quality requirements and provide users with universal selection according to their needs;

[0045] The present invention is mainly composed of a longitudinal beam reinforcement plate, a rear longitudinal beam rear portion, a rear guard mounting end plate, a welding nut seat and corresponding welding and welding points. By changing the longitudinal beam reinforcement plate, local rigidity and strength are achieved while achieving lightweight.

[0046] The longitudinal beam reinforcement plate in the present invention is composed of welding nut seat through holes, harness bayonet installation avoidance holes, welding clamp through holes, main positioning reference holes, positioning through holes, secondary positioning reference holes, leakage holes, various reinforcing ribs, and welding points. The welding nut seat is welded on the welding nut seat through holes, and different welding nut seat through holes are selected according to the towing mass of different models. For example, the trailer bar can be placed on the outside of the longitudinal beam, which is convenient for users to install and disassemble. The longitudinal beam reinforcement plate can be selected to be of a suitable size and attached to the outside of the longitudinal beam. By changing the material thickness and material, the local stiffness and strength are improved. The trailer bar can also be installed on the inside of the longitudinal beam. Special tools are required for installation and disassembly, but the force is reasonable. The requirements for the installation point are not as high as those there. The longitudinal beam reinforcement plate can be appropriately weakened. In addition, if the towing mass is large enough and the three connection points on the side are not enough, connection points can be added on the top surface to achieve the required functions. Its stability and reliability during use are ensured. After analysis, it can be achieved that the structural strength of different trailer bar connection points such as 0.75Kg, 1.3Kg, 1.5Kg, 1.8Kg, and 2.0Kg all meet the requirements, avoiding abnormal noise caused by insufficient local stiffness and strength, and even fatigue and durability problems in severe cases.

[0047] The specific structure is: Figure 1 , Figure 2 and Figure 7As shown: the vehicle body connection point structure includes a rear longitudinal beam reinforcement plate 6, a rear longitudinal beam rear part 5, a welding nut seat 7, a welding point 16, and a welding 17. The rear longitudinal beam reinforcement plate 6 and the rear longitudinal beam rear part 5 are connected by welding points 16. The welding nut seat 7 is welded to the rear longitudinal beam reinforcement plate 6 by welding 17, which is used to facilitate the rapid installation and removal of the standard long bolts 1 on the trailer bar system. The five connection points 11 fixed on the rear longitudinal beam reinforcement plate 6 and the rear longitudinal beam rear part 5 are used as platform parts. Different fixing points are selected according to the different towing masses of different models to meet the performance; generally, for vehicles below 1.3 tons, three side connection points 4 can meet the strength requirements; for vehicles between 1.3 tons and 2.0 tons, five connection points 11 are selected; if the connection point strength is not enough, the local stiffness and strength of the installation point can be enhanced by adjusting the material thickness and material of the rear longitudinal beam reinforcement plate 6. The trailer bar system cooperates with the connection of the selected five connection points 11 by changing the structure of the trailer bar mounting plate 2.

[0048] Rear longitudinal beam reinforcement plate 6: Figure 8 As shown, the structure is welded to the rear longitudinal beam rear portion 5 through the welding point 16, and the end portion is connected to the rear protection mounting end plate 9 through the welding point 16 and the welding 17. Figure 8 As shown, the specific features of the structure include a wiring harness buckle installation avoidance hole 6a, and a side welding surface 6b of the rear longitudinal beam rear part 5, a welding clamp through hole 6c, a weight reduction hole 6d, a welding nut seat through hole 6e, and a bottom welding surface 6f of the rear longitudinal beam rear part 5, a main positioning reference hole 6g, a leakage hole 6h, a secondary positioning reference hole 6i, a positioning through hole 6j, and a bottom reinforcement rib 6k. The overall structure of the rear longitudinal beam reinforcement plate 6 is reasonably selected in size, material and thickness according to the towing quality and safety collision requirements, and reasonable reinforcement ribs are set. The local structural features of the connection points are reasonably arranged in a reasonable position, which not only improves the stiffness and strength performance level of the itself, but also reduces the local stress concentration of the accessory installation structure, and reduces the risk of fatigue cracking of the sheet metal. The bottom reinforcement rib is to meet the EU anti-corrosion requirements through the anti-corrosion liquid, so that the overall anti-corrosion performance can also meet the requirements.

[0049] The rear longitudinal beam rear part 5: This structure connects the rear floor body 13, the rear longitudinal beam front body and the rear protection mounting end plate 9 to form a whole, and the three connection points on the rear longitudinal beam rear part 5 can also be installed with a shipping bracket, which is a universal part, such as Fig. 9 As shown, the specific features of the structure include a welding matching surface 5a with the rear guard mounting end plate 9, a spot welding matching surface 5b with the rear guard mounting end plate 9, a main positioning reference hole 5c, a trailer bar mounting bolt through hole 5d, a matching surface 5e with the rear floor connecting plate 12, a matching surface 5f with the front body of the rear longitudinal beam, a matching surface 5g with the rear floor body 13, and a transition feature 5h. In order to better match the front body of the rear longitudinal beam, positioning through holes 5i and secondary positioning reference holes 5j, and a rear platform component 5 of the rear longitudinal beam improve the overall stiffness and strength of the rear structure.

[0050] The present invention also avoids the rear high-speed safety problem through the reasonable structure of the rear longitudinal beam reinforcement plate 6. After analysis, this structure can achieve the structural strength of different trailer bar connection points of 0.75Kg, 1.3Kg, 1.5Kg, 1.8Kg, 2.0Kg, etc. to meet the requirements, avoiding abnormal noise caused by insufficient local stiffness and strength, and even causing fatigue durability problems in severe cases.

[0051] The above is only an explanation of the preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0052] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A fixed connection structure of a vehicle trailer bar, comprising a rear longitudinal beam, a rear longitudinal beam reinforcement plate, a trailer bar body and a towing structure, wherein the towing structure is arranged on the trailer bar body, and is characterized in that: The rear longitudinal beam is an open structure, the rear longitudinal beam reinforcement plate is arranged inside the rear longitudinal beam, the end of the trailer bar body is provided with a trailer bar mounting plate, the rear longitudinal beam and the rear longitudinal beam reinforcement plate are provided with a group of connecting holes corresponding to the trailer bar mounting plate, and are fixedly connected by fasteners passing through the connecting holes.

2. The automobile trailer bar fixed connection structure as claimed in claim 1, characterized in that: The rear longitudinal beam reinforcement plate and the rear longitudinal beam are fitted together and connected via a bolt and nut structure.

3. The automobile trailer bar fixed connection structure as claimed in claim 1, characterized in that: The rear longitudinal beam reinforcement plate is arranged in the rear part of the rear longitudinal beam, and the rear end of the rear part of the rear longitudinal beam is provided with a rear guard mounting end plate.

4. The automobile trailer bar fixed connection structure as claimed in claim 1, characterized in that: The trailer bar mounting plate includes a mounting plate upper structure and a mounting plate lower structure, an arc-shaped structure transition is provided between the mounting plate upper structure and the mounting plate lower structure, a group of connecting holes are provided on the mounting plate upper structure, and the end of the trailer bar body is connected to the mounting plate lower structure.

5. The automobile trailer bar fixed connection structure as claimed in claim 2, characterized in that: The opening edge of the rear longitudinal beam is provided with a flange structure connected to the floor, and a positioning reference hole is provided at the bottom of the rear longitudinal beam.

6. The automobile trailer bar fixed connection structure as claimed in claim 2, characterized in that: The trailer bar mounting plate is provided with a bottom connecting plate, and the bottom of the rear longitudinal beam and the bottom connecting plate are both provided with correspondingly connected bottom connecting holes.

7. The automobile trailer bar fixed connection structure as claimed in claim 2, characterized in that: The rear longitudinal beam is a U-shaped structure, and connection holes are arranged on the inner side wall and the outer side wall of the rear longitudinal beam.

8. The automobile trailer bar fixed connection structure as claimed in claim 3, characterized in that: The trailer bar body is located in front of the rear guard mounting end plate, and the trailer bar body is located below the rear longitudinal beam.

9. The automobile trailer bar fixed connection structure as claimed in claim 6, characterized in that: The upper part of the trailer bar mounting plate is fitted with the side surface of the rear longitudinal beam, and the bottom connecting plate is fitted with the bottom surface of the rear longitudinal beam.

10. The automobile trailer bar fixed connection structure as claimed in claim 9, characterized in that: The upper part and the bottom connecting plate of the trailer bar mounting plate are L-shaped structures.

Images