Fixed connection structure of rear trailer lever

Abstract

The invention belongs to the technical field of automobile parts, and provides a rear tow bar fixed connection structure which comprises a tow ball, a tow bar, a tow bar connecting plate, an end plate, a rear longitudinal beam and a rear longitudinal beam reinforcing plate, the tow ball is fixedly installed on the lower surface of the tow bar, the end plate is installed between the rear longitudinal beam and the tow bar connecting plate, and the end plate is fixedly connected with the tow bar connecting plate; a rear longitudinal beam reinforcing plate is fixedly installed on the outer surface of the end, close to the trailer bar connecting plate, of the rear longitudinal beam and fixedly connected with the side, away from the trailer bar connecting plate, of the end plate. According to the invention, an end face connection mode (the end plate and the trailer lever connection plate are connected) is adopted to replace the original plug-in installation mode; according to the connecting structure, the tow bar is easy and fast to install, it can be guaranteed that the connecting point of a vehicle body and the tow bar has enough rigidity and strength, the vehicle body and the tow bar are prevented from deforming and cracking due to violent shaking in the running process of a vehicle, and the safety in the running process is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automobile parts, in particular to a rear trailer bar fixed connection structure. BACKGROUND

[0002] With the increasing demand of consumers for automobile personalization and multi-functionality, it is required that the automobile has the ability to tow a recreational vehicle in addition to carrying people, so the demand for high-end, customized trailer bar products continues to rise. The development of new energy vehicles has driven the demand for trailer bar accessories that meet different power transmission requirements to grow. Therefore, trailer bars with high safety performance have gradually become a market hotspot. At the same time, the growth of the number of automobiles in use has directly driven the increase in demand for trailer bars, especially as the market share of SUVs and pickup trucks continues to expand, the demand for related accessories has also increased.

[0003] Because the trailer bar is a rear-mounted system, the common installation method for the trailer bar is to insert it into the rear part of the rear longitudinal beam for connection. This installation method requires experienced personnel to perform professional installation due to the long insertion, complex matching surface, high number of holes, and high corresponding precision, and it is not easy to disassemble. At the same time, during vehicle travel, the vehicle body and trailer bar assembly will be subjected to vibrations and impacts from the road. If the strength and durability do not meet the requirements, it will cause the vehicle body and trailer bar assembly to deform, crack, or even fall off, posing a safety hazard.

[0004] Therefore, there is a need for a trailer bar that can be easily disassembled and has high connection strength. SUMMARY

[0005] To solve the above problems, the present application provides a rear trailer bar fixed connection structure, which comprises a trailer ball, a trailer bar, a trailer bar connecting plate, an end plate, a rear longitudinal beam, and a rear longitudinal beam reinforcing plate. The lower surface of the trailer bar is fixedly installed with the trailer ball. The side surface near the end of the trailer bar is fixedly installed with the trailer bar connecting plate. The end of the trailer bar connecting plate away from the trailer bar is installed with the rear longitudinal beam. The end plate is installed between the rear longitudinal beam and the trailer bar connecting plate, and the end plate is fixedly connected with the trailer bar connecting plate. The outer surface of the end of the rear longitudinal beam near the trailer bar connecting plate is fixedly installed with the rear longitudinal beam reinforcing plate, and the rear longitudinal beam reinforcing plate is fixedly connected with the side of the end plate away from the trailer bar connecting plate.

[0006] Further, the end of the rear longitudinal beam and the end plate are welded.

[0007] Further, the rear longitudinal beam is internally provided with a reinforcing plate.

[0008] Further, the rear longitudinal beam is provided with a first mounting hole, and the first mounting hole is fixedly connected with the rear longitudinal beam reinforcing plate through a second bolt.

[0009] Further, an auxiliary structure is mounted on the outer surface of the trailer bar, and the auxiliary structure is located on one side of the trailer bar close to the rear longitudinal beam and between two adjacent rear longitudinal beams.

[0010] Further, the auxiliary structure comprises a triangular plate, a first connecting plate and a second connecting plate, the triangular plate is mounted on the outer surface of the trailer bar, and the first connecting plate is arranged on the surface of the triangular plate; the lower surface of the trailer bar is provided with two second connecting plates, and the two second connecting plates are located on the two sides of the trailer ball respectively.

[0011] Further, the first connecting plate and the second connecting plate are both L-shaped.

[0012] Further, the lower surface of the trailer bar connecting plate is provided with an L-shaped plate.

[0013] Further, the rear longitudinal beam reinforcing plate is in a U-shaped structure, and a third matching surface and a fourth matching surface perpendicular to each other are arranged on the rear longitudinal beam reinforcing plate; the third matching surface is fixedly connected with the end plate, and the fourth matching surface is fixedly connected with the rear longitudinal beam.

[0014] Further, the end plate is provided with a mounting plate perpendicular to the end plate, and a connecting hole is arranged on the upper surface of the mounting plate; the mounting plate is connected with the rear longitudinal beam through the connecting hole; a plurality of bolt mounting holes are arranged on the end plate close to the edge.

[0015] The present application has the following advantages: 1. The trailer bar connecting plate is fixedly mounted on the side surface of the trailer bar, and the rear longitudinal beam is mounted on the end of the trailer bar connecting plate away from the trailer bar; the end plate is mounted between the rear longitudinal beam and the trailer bar connecting plate, and the end plate is fixedly connected with the trailer bar connecting plate; the rear longitudinal beam reinforcing plate is fixedly mounted on the outer surface of the rear longitudinal beam, and the end plate is fixedly connected on the side of the rear longitudinal beam reinforcing plate away from the trailer bar connecting plate; the end face connection mode (the end plate and the trailer bar connecting plate are connected) is adopted instead of the original insertion type installation; the connection structure not only makes the installation of the trailer bar simple and fast, but also can ensure that the connection point of the vehicle body and the trailer bar has sufficient rigidity and strength, so as to prevent the deformation and cracking of the vehicle body and the trailer bar due to violent shaking during driving, and improve the safety during driving.

[0016] 2. The rigidity and strength of the connection point of the vehicle body and the trailer bar are guaranteed, which plays a crucial role in driving safety, and needs to meet the corresponding national standards, American standards and various specifications in the domestic and foreign markets, so as to ensure the stability, reliability and safety of the quality.

[0017] 3. This invention uses bolts to connect the trailer bar and the vehicle body, making it easy to install and disassemble. It provides multiple connection points on one side for the trailer bar to choose from, meeting different towing capacity requirements and allowing users to select based on their specific needs. The multiple connection points enable the trailer bar to be installed with varying towing capacities while ensuring connection strength, solving the problems of deformation and cracking at connection points caused by vibration and impact during vehicle operation. This invention has a certain degree of versatility, adaptable to different types of trailer bars, providing a consistent installation method and fixing effect for various vehicle models.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An isometric schematic diagram of the connection between the trailer bar and the rear longitudinal beam in an embodiment of the present invention is shown.

[0021] Figure 2 A rear view schematic diagram of the connection between the trailer bumper and the rear longitudinal beam in an embodiment of the present invention is shown.

[0022] Figure 3 An isometric schematic diagram of the connection between the trailer bumper and the rear bulkhead assembly in an embodiment of the present invention is shown.

[0023] Figure 4 An isometric schematic diagram of the connection between the trailer bar and the rear longitudinal beam in an embodiment of the present invention is shown.

[0024] Figure 5 An exploded view of the fixed connection structure of the rear trailer bumper in an embodiment of the present invention is shown.

[0025] Figure 6 An isometric schematic diagram of the connection between the end plate and the rear longitudinal beam in an embodiment of the present invention is shown.

[0026] Figure 7 An isometric schematic diagram showing the connection between the end plate and the rear longitudinal beam via a welded layer in an embodiment of the present invention is shown.

[0027] Figure 8 An exploded view of the end plate, rear longitudinal beam, and rear longitudinal beam reinforcing plate in an embodiment of the present invention is shown.

[0028] Figure 9 A schematic diagram of the end plate structure in an embodiment of the present invention is shown.

[0029] Figure 10 A schematic diagram of the rear longitudinal beam reinforcement plate in an embodiment of the present invention is shown.

[0030] Figure 11 A schematic diagram of the rear longitudinal beam in an embodiment of the present invention is shown.

[0031] Figure 12 A bottom view of the rear longitudinal beam in an embodiment of the present invention is shown.

[0032] Figure 13 A partial structural schematic diagram of the connection between the trailer bar and the rear longitudinal beam in an embodiment of the present invention is shown.

[0033] In the diagram, 1. Trailer ball; 2. Welded square nut; 3. Hexagonal nut; 4. Auxiliary structure; 41. Triangular plate; 42. First connecting plate; 43. Second connecting plate; 5. Trailer bar; 6. Trailer bar connecting plate; 61. L-shaped plate; 62. Connecting plate; 8. Press-fit bolts; 9. Projection weld bolts; 10. First bolt; 11. Second bolt; 12. Trailer ball joint plate; 13. Rear bulkhead assembly; 14. Rear floor joint plate; 16. End plate; 16a. Bolt mounting hole; 16b. Weight reduction hole; 16c. First positioning hole; 16d. First press-fit bolt hole; 16e. Connecting hole; 16f. Mounting plate; 16g. Second positioning hole; 16h. Snap-fit ​​hole; 17. Rear longitudinal beam; 17a. First mounting hole; 17b. Wiring harness anti-rotation hole; 17c. Second mounting hole; 17d. First mating surface; 17e. Second press-fit bolt hole; 17f. Clip mounting hole; 17g. Second mating surface; 17h. Third positioning hole; 17i. CDU bracket positioning hole; 17j. Fourth positioning hole; 17k. Clearance positioning hole; 17l. Matching end face; 17m. Reinforcing plate; 18. Rear longitudinal beam reinforcing plate; 181. Third mating surface; 182. Weld hole; 183. First bolt connection hole; 184. Second bolt connection hole; 185. Fourth mating surface; 19. Press-fit nut; 20. Pull-fit nut; 21. Weld layer. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0035] refer to Figure 1 A rear trailer bumper fixing connection structure includes a trailer ball 1, a trailer bumper 5, a trailer bumper connecting plate 6, an end plate 16, a rear longitudinal beam 17, and a rear longitudinal beam reinforcing plate 18. The trailer ball 1 (fixed to the lower surface of the trailer bumper 5 via two trailer ball connecting plates 12) is fixedly installed on the lower surface of the trailer bumper 5. The trailer bumper connecting plate 6 is fixedly installed on the side surface of the trailer bumper 5 near its end. The rear longitudinal beam 17 is installed at the end of the trailer bumper connecting plate 6 away from the trailer bumper 5. The end plate 16 is installed between the rear longitudinal beam 17 and the trailer bumper connecting plate 6, and is fixedly connected to the trailer bumper connecting plate 6. The rear longitudinal beam reinforcing plate 18 is fixedly installed on the outer surface of the rear longitudinal beam 17 near the trailer bumper connecting plate 6, and is fixedly connected to the side of the end plate 16 away from the trailer bumper connecting plate 6. The trailer bumper connecting plate 6, the end plate 16, and the rear longitudinal beam reinforcing plate 18 are connected by hexagonal nuts 3 and projection weld bolts 9.

[0036] In another alternative embodiment, the present invention is mainly composed of a rear longitudinal beam reinforcing plate 18, a rear longitudinal beam 17, and an end plate 16. The rear longitudinal beam reinforcing plate 18, the rear longitudinal beam 17, and the end plate 16 are connected by rivet nuts 20 and press-fit nuts 19 and corresponding welded layers 21. The rear longitudinal beam reinforcing plate 18 in the present invention is composed of a third mating surface 181 and a fourth mating surface 185. The rear longitudinal beam reinforcing plate 18 can connect the end plate 16 and the rear longitudinal beam 17, making the rear longitudinal beam reinforcing plate 18, the rear longitudinal beam 17, and the end plate 16 a whole, ensuring connection strength.

[0037] A welding hole 182 and a second bolt connection hole 184 are provided on the third mating surface 181. Both the welding hole 182 and the second bolt connection hole 184 are aligned with the bolt mounting holes 16a of the end plate 16 and are connected by projection weld bolts 9 and first bolts 10. A first bolt connection hole 183 is provided on the fourth mating surface 185. The first bolt connection hole 183 is aligned with the first mounting hole 17a and is connected by second bolts 11. The rear longitudinal beam 17 is fixedly connected to the rear bulkhead assembly 13 and the rear floor connecting plate 14 by bolts (see reference). Figure 3 And, it is fixedly connected by welding.

[0038] This invention employs an end-face connection method (connecting the end plate 16 and the trailer bumper connecting plate 6) to replace the original insert-type installation. This connection structure not only simplifies and speeds up the installation of the trailer bumper 5, but also ensures sufficient rigidity and strength at the connection point between the vehicle body and the trailer bumper 5. This prevents deformation and cracking of the vehicle body and trailer bumper 5 due to severe shaking during vehicle operation, thus improving safety during driving. This invention also possesses a degree of versatility, adapting to different types of trailer bumpers 5 and providing a consistent installation method and fixing effect for various vehicle models.

[0039] Ensuring the rigidity and strength of the connection point between the vehicle body and the trailer bumper in this invention plays a crucial role in driving safety. Furthermore, it needs to meet various national standards, American standards, and other specifications applicable to domestic and international markets to guarantee the stability, reliability, and safety of its quality.

[0040] The purpose of this patent is to provide a structure that facilitates the connection and installation of the vehicle body and the trailer bumper 5, offering strong versatility and enabling the trailer bumper 5 to be installed with different towing capacities. It ensures sufficient local rigidity and strength, aiming to solve the problems of deformation and cracking at the connection points caused by vibration and impact during vehicle operation, while also enhancing rear-end collision safety. To achieve the above objectives, this invention adopts the following technical solution: the trailer bumper 5 and the vehicle body are connected by bolts, facilitating easy installation and disassembly. It provides seven connection points on one side for the trailer bumper 5 to choose from, meeting different towing capacities and allowing users to select based on their needs for versatility.

[0041] refer to Figure 6 The ends of the rear longitudinal beam 17 are welded to the end plate 16. Specifically, a weld layer 21 is welded between the second mating surface 17g of the rear longitudinal beam 17 and the end plate 16, that is, the second mating surface 17g and the end plate 16 form a weld layer 21 through a welding process, which improves the strength of the connection.

[0042] refer to Figure 11 A reinforcing plate 17m is provided inside the rear longitudinal beam 17, thereby increasing the structural strength of the rear longitudinal beam 17. A first mounting hole 17a is provided on the rear longitudinal beam 17, and the first mounting hole 17a is fixedly connected to the reinforcing plate 18 of the rear longitudinal beam by a second bolt 11.

[0043] refer to Figure 12The rear longitudinal beam 17 connects the rear bulkhead assembly 13, the rear floor connecting plate 14, and the end plate 16 to form a whole. The outer surface of the rear longitudinal beam 17 near the trailer bumper 5 has first mounting holes 17a, with two first mounting holes 17a on each of the left and right sides and one first mounting hole 17a on the lower surface. The first mounting holes 17a correspond to the first bolt connection holes 183 on the rear longitudinal beam reinforcing plate 18 and are connected by second bolts 11. The lower surface of the rear longitudinal beam 17 has a wire harness anti-rotation hole 17b, located to one side of the first mounting hole 17a. The wire harness anti-rotation hole 17b is used to overlap the negative wire harness and prevent it from rotating. The upper and lower surfaces of the rear longitudinal beam 17 both have second mounting holes 17c, which are used for CDU (Conversion & Distribution) connections. Unit (high-voltage electronic control integrated system or vehicle high-voltage conversion module) bracket connection; the upper surface of the rear longitudinal beam 17 is the first matching surface 17d, which is the surface connected to the rear floor connecting plate 14; the side and bottom of the rear longitudinal beam 17 are provided with second press-fit bolt holes 17e, which are used to connect with the vehicle longitudinal beam; the side of the rear longitudinal beam 17 is provided with clip mounting holes 17f, which are mounting holes for vehicle interior wiring harness clips; the lower surface of the rear longitudinal beam 17 is provided with a third positioning hole 17h, which is used to install the rear longitudinal beam. The rear longitudinal beam 17 is used for positioning; the lower surface of the rear longitudinal beam 17 is provided with a CDU bracket positioning hole 17i, which is used to install the CDU bracket; the lower surface of the rear longitudinal beam 17 is provided with a fourth positioning hole 17j, which is used for positioning when installing the rear longitudinal beam 17; the lower surface of the rear longitudinal beam 17 away from the trailer bar 5 is provided with an avoidance positioning hole 17k, which is used to avoid the positioning hole of the rear longitudinal beam 17; the side of the rear longitudinal beam 17 away from the trailer bar 5 is a matching end face 17l, which is used to match the rear longitudinal beam 17.

[0044] This invention avoids high-speed rear safety issues by rationally designing the structure of the rear longitudinal beam reinforcing plate 18. Analysis shows that this structure can meet the structural strength requirements of the connection points for trailer booms 5 with different configurations, ensuring vehicle safety when towing objects.

[0045] refer to Figure 2 An auxiliary structure 4 is installed on the outer surface of the trailer bumper 5. (Refer to the auxiliary structure 4) Figure 5 The auxiliary structure 4 is located on the side of the trailer bumper 5 near the rear longitudinal beam 17, and is located between two adjacent rear longitudinal beams 17. The auxiliary structure 4 is used to connect the bumper.

[0046] refer to Figure 2The auxiliary structure 4 includes a triangular plate 41, a first connecting plate 42, and a second connecting plate 43. The triangular plate 41 is installed on the outer surface of the trailer bar 5 and is fixedly connected to the trailer ball connecting plate 12. That is, the triangular plate 41 is used to reinforce the trailer ball connecting plate 12. The first connecting plate 42 is provided on the surface of the triangular plate 41 and is used to install the wiring harness. Two second connecting plates 43 are provided on the lower surface of the trailer bar 5. The two second connecting plates 43 are located on both sides of the trailer ball 1.

[0047] Furthermore, both the first connecting plate 42 and the second connecting plate 43 are L-shaped. The L-shaped hooks of the first connecting plate 42 and the second connecting plate 43 are placed facing each other, and the second connecting plate 43 is used to connect the bumper (see reference). Figure 13 ).

[0048] refer to Figure 4 The lower surface of the trailer bumper connecting plate 6 is provided with an L-shaped plate 61. The L-shaped plate 61 is a support for placing the bumper, which facilitates the fixing and connection of the bumper. The trailer bumper connecting plate 6 is connected to the trailer bumper 5 through a connecting plate 62.

[0049] refer to Figure 10 The rear longitudinal beam reinforcing plate 18 has a U-shaped structure. The rear longitudinal beam reinforcing plate 18 is provided with a third matching surface 181 and a fourth matching surface 185. The fourth matching surface 185 is perpendicular to the third matching surface 181. The third matching surface 181 is fixedly connected to the end plate 16, and the fourth matching surface 185 is fixedly connected to the rear longitudinal beam 17.

[0050] refer to Figure 8 The rear longitudinal beam reinforcing plate 18 is connected to the rear longitudinal beam 17 via the second bolt 11 and the rivet nut 20, and its end is connected to the bolt mounting hole 16a of the end plate 16 via the projection weld bolt 9. The overall structure of the rear longitudinal beam reinforcing plate 18 allows for reasonable selection of size, material, and thickness based on towing mass and safety collision requirements. The local structural features of the connection points are rationally arranged, which not only improves its own rigidity and strength performance but also reduces local stress concentration in the accessory installation structure, lowering the risk of sheet metal fatigue cracking. The rear longitudinal beam reinforcing plate 18 is designed to meet EU corrosion protection requirements, avoiding excessively large mating surfaces, and is resistant to corrosion-resistant liquids, ensuring overall corrosion resistance meets the requirements.

[0051] refer to Figure 9 An mounting plate 16f is provided on the end plate 16. The mounting plate 16f is perpendicular to the end plate 16. The upper surface of the mounting plate 16f is provided with a connecting hole 16e, which is an FDS (Flow Drill Screw, abbreviated as FDS, bolt self-tapping screw technology) through hole. The mounting plate 16f is connected to the rear longitudinal beam 17 through the connecting hole 16e.

[0052] The rear longitudinal beam reinforcing plate 18 has five first bolt connection holes 183, which are matched with the first mounting holes 17a of the rear longitudinal beam 17 and are connected by five bolts respectively.

[0053] refer to Figure 7 The end plate 16 and the rear longitudinal beam reinforcing plate 18 are connected by four projection welding bolts 9, and the end plate 16 and the rear bulkhead assembly 13 are connected by two press-fit bolts 8 (see reference). Figure 6 The end plate 16 is connected to the welded square nut 2 on the trailer bar connecting plate 6 by bolts. The connection point between the trailer bar 5 and the vehicle body is on the surface of the end plate 16, which facilitates installation and disassembly by the user, while ensuring its stability and reliability during use.

[0054] refer to Figure 9 The end plate 16 is provided with bolt mounting holes 16a, weight reduction holes 16b, first positioning holes 16c, first rivet bolt holes 16d, connecting holes 16e, mounting plates 16f, and snap-fit ​​holes 16h. Bolt mounting holes 16a are located at the lower part of the end plate 16, used to align with welding holes 182 and connect to the vehicle body bolts, and can also be used for connecting trailer bumpers and the vehicle body, thus having a certain degree of versatility. Weight reduction holes 16b are located in the middle of the end plate 16, totaling four, used to reduce the weight of the parts and facilitate the flow of electrophoretic coating liquid. The first positioning holes 16a, 16b, and 16c are also provided. c and the second positioning hole 16g are located on both sides of the weight reduction hole 16b. The first positioning hole 16c is used for part positioning. The first rivet bolt hole 16d is located above the first positioning hole 16c and the second positioning hole 16g, and is used for rivet bolt 8 to be riveted to the end plate 16. The connecting hole 16e is located at the position of the folded plate of the end plate 16. It is used for FDS screw installation to connect the rear longitudinal beam 17 to the rear floor connecting plate 14. The second positioning hole 16g is used for part positioning. The snap-fit ​​hole 16h is located at the edge of the end plate 16 and is used for the air pump pipe to be snapped and fixed to the vehicle body.

[0055] The rear longitudinal beam reinforcing plate 18 and the rear longitudinal beam 17 are connected by the second bolt 11, with a total of 5 connection points. Rivet nuts 20 are riveted to the rear longitudinal beam 17, facilitating the connection of the rear longitudinal beam reinforcing plate 18 and the second bolt 11, enabling quick installation and disassembly. The end plate 16 is connected to the rear longitudinal beam 17 via a welded layer 21 (see reference). Figure 7 The rear longitudinal beam reinforcing plate 18 is installed together with the end plate 16 through welding holes 182. There are a total of 7 connection points on the end plate 16, which can adapt to different towing capacity targets of different vehicle models. For ordinary sedans, the towing capacity of this structure is generally below 1.5 tons. When this structure is installed on SUV models, the towing capacity is below 2 tons.

[0056] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rear trailer bumper fixing connection structure, characterized in that, The system includes a trailer ball (1), a trailer bar (5), a trailer bar connecting plate (6), an end plate (16), a rear longitudinal beam (17), and a rear longitudinal beam reinforcing plate (18). The trailer ball (1) is fixedly installed on the lower surface of the trailer bar (5), and the trailer bar connecting plate (6) is fixedly installed on the side surface of the trailer bar (5) near the end. The rear longitudinal beam (17) is installed at the end of the trailer bar connecting plate (6) away from the trailer bar (5). The end plate (16) is installed between the rear longitudinal beam (17) and the trailer bar connecting plate (6), and the end plate (16) is fixedly connected to the trailer bar connecting plate (6). The rear longitudinal beam reinforcing plate (18) is fixedly installed on the outer surface of the rear longitudinal beam (17) near the trailer bar connecting plate (6), and the rear longitudinal beam reinforcing plate (18) is fixedly connected to the side of the end plate (16) away from the trailer bar connecting plate (6).

2. The rear trailer bumper fixing connection structure according to claim 1, characterized in that, The ends of the rear longitudinal beam (17) and the end plate (16) are welded together.

3. A rear trailer bumper fixing connection structure according to claim 1 or 2, characterized in that, The rear longitudinal beam (17) is equipped with a reinforcing plate (17m).

4. The rear trailer bumper fixing connection structure according to claim 3, characterized in that, The rear longitudinal beam (17) is provided with a first mounting hole (17a), which is fixedly connected to the rear longitudinal beam reinforcing plate (18) by a second bolt (11).

5. The rear trailer bumper fixing connection structure according to claim 1, characterized in that, An auxiliary structure (4) is installed on the outer surface of the trailer bar (5). The auxiliary structure (4) is located on the side of the trailer bar (5) near the rear longitudinal beam (17) and is located between two adjacent rear longitudinal beams (17).

6. The rear trailer bar fixing connection structure according to claim 5, characterized in that, The auxiliary structure (4) includes a triangular plate (41), a first connecting plate (42), and a second connecting plate (43). The triangular plate (41) is installed on the outer surface of the trailer bar (5), and the first connecting plate (42) is provided on the surface of the triangular plate (41). Two second connecting plates (43) are provided on the lower surface of the trailer bar (5), and the two second connecting plates (43) are located on both sides of the trailer ball (1).

7. The rear trailer bar fixing connection structure according to claim 6, characterized in that, Both the first connecting plate (42) and the second connecting plate (43) are L-shaped.

8. The rear trailer bumper fixing connection structure according to claim 1, characterized in that, The lower surface of the trailer bar connecting plate (6) is provided with an L-shaped plate (61).

9. A rear trailer bumper fixing connection structure according to claim 1, characterized in that, The rear longitudinal beam reinforcing plate (18) has a U-shaped structure and is provided with a third matching surface (181) and a fourth matching surface (185) that are perpendicular to each other; the third matching surface (181) is fixedly connected to the end plate (16) and the fourth matching surface (185) is fixedly connected to the rear longitudinal beam (17).

10. A rear trailer bar fixing connection structure according to claim 1, characterized in that, An mounting plate (16f) is provided on the end plate (16). The mounting plate (16f) is perpendicular to the end plate (16). A connecting hole (16e) is provided on the upper surface of the mounting plate (16f). The mounting plate (16f) is connected to the rear longitudinal beam (17) through the connecting hole (16e). A plurality of bolt mounting holes (16a) are provided on the end plate (16). The plurality of bolt mounting holes (16a) are located near the edge of the end plate (16).

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