Trailer connecting device

Abstract

The utility model discloses a trailer connecting device, which relates to the technical field of automobile processing equipment, and comprises a traction seat and a traction rod, the traction seat is provided with a butt joint assembly used for connecting the traction seat and the traction rod, the butt joint assembly comprises a pin shaft, the middle part of the pin shaft is provided with a plurality of groups of oil outlet holes, and the oil outlet holes are communicated with the traction seat. An oil injection hole is formed in the center of the top of the pin shaft, an oil can is fixedly installed at the top of the traction base, an oil injection nozzle is installed on the oil can in a matched mode, and a traction head is rotationally installed at the end, close to the traction base, of the traction rod. According to the design scheme, through the design that the oil outlet hole is formed in the pin shaft, after the pin shaft is connected with the traction head, the top end of the pin shaft extrudes the oil injection nozzle, so that lubricating oil in the oil can is slowly injected into the oil injection hole and seeps outwards from the oil outlet hole through the oil injection hole, and therefore the joint of the pin shaft and the traction head is lubricated; friction between the two is reduced, abrasion is reduced, and the service life of the tractor is prolonged.

Description

A trailer coupling device Technical Field

[0001] This utility model relates to the field of automotive processing equipment technology, and in particular to a trailer connection device. Background Technology

[0002] A trailer is a vehicle that is towed by a car but has no power drive itself. Trailers and towing vehicles are generally connected by a towing device.

[0003] CN 222629033 U discloses a wear-resistant towing device for full trailers, including a towing seat and a towing rod. The surface of the towing seat is provided with a docking assembly for connecting the towing seat and the towing rod. The surface of the towing seat is also provided with a manual control assembly for controlling the operation of the docking assembly. A mounting plate is provided on the left side of the towing seat, and the surface of the mounting plate is provided with a buffer assembly for cushioning the towing seat. A mounting ear is fixedly connected to the left side of the mounting plate. This towing device facilitates quick towing and connection of trailers during use. Compared with existing technologies, it effectively improves the structural strength of the connection point, can withstand greater traction force, and uses a non-rigid connection method to buffer vibration during towing, thereby preventing vibration from damaging the towing device.

[0004] However, when encountering uneven road conditions, the aforementioned tow unit cannot bend back and forth between the tow seat and the tow rod, which affects the stability of the vehicle during driving. Furthermore, there is a lack of technical means to reduce friction between the tow rod and the pin. Even if the pin surface, the connecting ring surface, and the inner wall of the notch are coated with a wear-resistant coating, significant wear will still occur between the tow rod and the pin after prolonged use, affecting the connection stability between the tow seat and the tow rod, resulting in a shorter service life for the tow unit. Summary of the Invention

[0005] In order to overcome the above-mentioned defects in the prior art, the present invention provides a trailer connection device.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a trailer connecting device, including a towing seat and a towing rod, wherein the towing seat is provided with a docking assembly for connecting the towing seat and the towing rod, the docking assembly includes a pin, the middle of the pin is provided with a plurality of oil outlet holes, the top center of the pin is provided with an oil filling hole, the top of the towing seat is fixedly installed with an oil can, the oil can is fitted with an oil filling nozzle, the end of the towing rod near the towing seat is rotatably mounted with a towing head, the towing head is provided with a connecting hole that matches the pin, and the side of the towing seat away from the towing rod is provided with a buffer assembly.

[0007] Furthermore, the docking assembly also includes an adjusting screw and a guide rod. The traction seat has a hollow structure. The adjusting screw is rotatably mounted on the upper and lower inner walls of the traction seat. An adjusting knob is fixedly mounted on the top of the adjusting screw. The guide rod is arranged parallel to the adjusting screw and is fixedly mounted on the upper and lower inner walls of the traction seat. A connecting rod is slidably mounted on the guide rod. The connecting rod has a threaded hole that matches the adjusting screw and is fixedly mounted on the bottom end of the pin.

[0008] Furthermore, a groove is provided on the right side wall of the traction seat, and through holes matching the pin are provided on the upper and lower side walls of the groove. The pin is slidably installed in the through holes, and the oil injection nozzle is coaxially arranged with the pin.

[0009] Furthermore, the oil nozzle includes an oil nozzle shell with a cavity inside. A plug is slidably installed at the bottom of the cavity, and a truncated cone is provided at the top of the plug. A conical surface matching the truncated cone is provided on the bottom side wall of the cavity. A first oil passage is provided on the side wall of the truncated cone, and a second oil passage communicating with the first oil passage is provided at the center of the plug. A return spring is fitted between the plug and the top wall of the cavity, and a plurality of oil inlet holes are provided on the top wall of the cavity.

[0010] Furthermore, the top of the oil container is provided with an oil filling port, and a sealing cap is fitted to the end of the oil filling port.

[0011] Furthermore, the traction rod and the traction head are connected to each other via a connecting shaft, and the connecting shaft and the pin are perpendicular to each other.

[0012] Furthermore, the buffer assembly includes a mounting base, a limiting post fixedly mounted on the mounting base, a connecting seat slidably mounted on the limiting post, a connecting plate fixedly mounted on the connecting seat, the connecting plate fixedly mounted on the traction seat, a buffer spring fitted at the bottom end of the limiting post, the two ends of the buffer spring respectively abutting against the inner walls of the connecting seat and the mounting base, a damping rod fixedly mounted at the top of the inner wall of the mounting base, and the telescopic end of the damping rod fixedly connected to the connecting seat.

[0013] The beneficial effects of this utility model are that, through the design of an oil outlet hole on the pin, after the pin is connected to the traction head, the top of the pin squeezes the oil injection nozzle, causing the lubricating oil in the oil reservoir to slowly inject into the oil injection hole, and then seep out from the oil outlet hole through the oil injection hole, thereby lubricating the connection between the pin and the traction head, reducing friction between the two, reducing wear, and helping to extend the service life of the traction device.

[0014] This utility model design incorporates a traction head that is rotatably mounted at the end of the traction rod, allowing the traction seat and traction rod to bend back and forth, which helps improve the stability of the vehicle. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 is a three-dimensional structural diagram of this utility model;

[0017] Figure 2 is a front view of this utility model;

[0018] Figure 3 is a top view of this utility model;

[0019] Figure 4 is a schematic diagram of the cross-sectional structure along the AA direction in Figure 3;

[0020] Figure 5 is a magnified view of region B in Figure 4.

[0021] In the diagram: 1. Traction seat, 2. Traction rod, 3. Pin, 4. Oil outlet, 5. Oil inlet, 6. Oil can, 7. Traction head, 8. Connecting hole, 9. Adjusting screw, 10. Guide rod, 11. Adjusting knob, 12. Connecting rod, 13. Threaded hole, 14. Groove, 15. Through hole, 16. Oil nozzle shell, 17. Cavity, 18. Plug, 19. Conical frustum, 20. Conical surface, 21. First oil passage, 22. Second oil passage, 23. Return spring, 24. Oil inlet, 25. Oil filler port, 26. Sealing cap, 27. Connecting shaft, 28. Mounting seat, 29. Limiting post, 30. Connecting seat, 31. Connecting plate, 32. Buffer spring, 33. Damping rod. Detailed Implementation

[0022] To more clearly illustrate the technical solution of this utility model, the following description is made in conjunction with the accompanying drawings. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings and embodiments without creative effort, and all of them fall within the protection scope of this utility model.

[0023] As shown in Figures 1-5, a trailer connection device includes a towing seat 1 and a towing rod 2. The towing seat 1 is provided with a docking assembly for connecting the towing seat 1 and the towing rod 2. The docking assembly includes a pin 3, with several sets of oil outlet holes 4 in the middle of the pin 3 and an oil filling hole 5 at the center of the top of the pin 3. An oil can 6 is fixedly installed on the top of the towing seat 1, and an oil filling nozzle is fitted on the oil can 6. A towing head 7 is rotatably installed on the end of the towing rod 2 near the towing seat 1. The towing rod 2 and the towing head 7 are connected to each other by a connecting shaft 27, which is perpendicular to the pin 3. The towing head 7 has a connecting hole 8 that matches the pin 3. A buffer assembly is provided on the side of the towing seat 1 away from the towing rod 2.

[0024] In this embodiment, the docking assembly also includes an adjusting screw 9 and a guide rod 10. The traction seat 1 has a hollow structure. The adjusting screw 9 is rotatably mounted on the upper and lower inner walls of the traction seat 1. An adjusting knob 11 is fixedly mounted on the top of the adjusting screw 9. The guide rod 10 is arranged parallel to the adjusting screw 9 and is fixedly mounted on the upper and lower inner walls of the traction seat 1. A connecting rod 12 is slidably mounted on the guide rod 10. The connecting rod 12 has a threaded hole 13 that matches the adjusting screw 9. The connecting rod 12 is installed together with the adjusting screw 9 through a thread. The connecting rod 12 is fixedly mounted on the bottom end of the pin 3. The user rotates the adjusting knob 11 to rotate the adjusting screw 9. Under the action of the adjusting screw 9, the connecting rod 12 slides along the guide rod 10, thereby driving the pin 3 to connect or separate from the traction head 7.

[0025] In this embodiment, a slot 14 is provided on the right side wall of the traction seat 1, and through holes 15 matching the pin 3 are provided on the upper and lower side walls of the slot 14. The pin 3 is slidably installed in the through holes 15, and the oil injection nozzle is coaxially arranged with the pin 3.

[0026] In this embodiment, the grease fitting includes a grease fitting housing 16, with a cavity 17 inside. A plug 18 is slidably mounted on the bottom end of the cavity 17, and a truncated cone 19 is provided on the top end of the plug 18. A conical surface 20 matching the truncated cone 19 is provided on the bottom side wall of the cavity 17. A first oil passage 21 is formed on the side wall of the truncated cone 19, and a second oil passage 22 communicating with the first oil passage 21 is formed at the center of the plug 18. A composite grease fitting is fitted between the plug 18 and the top wall of the cavity 17. The cavity 17 has several sets of oil inlet holes 24 on its top wall. The lubricating oil in the oil reservoir 6 enters the cavity 17 through the oil inlet holes 24. Under the elastic force of the return spring 23, the cone 19 abuts against the cone surface 20 to prevent the lubricating oil in the oil reservoir 6 from leaking out. When the pin 3 pushes the plug 18 upward, the cone 19 and the cone surface 20 separate from each other, and the lubricating oil in the cavity 17 is injected into the oil injection hole 5 of the pin 3 through the first oil passage 21 and the second oil passage 22.

[0027] In this embodiment, the top of the oil reservoir 6 is provided with an oil filling port 25, and the end of the oil filling port 25 is fitted with a sealing cap 26. The oil reservoir 6 stores some lubricating oil. When the pin 3 is connected to the traction head 7, the lubricating oil in the oil reservoir 6 is slowly injected into the pin 3 to lubricate the connection between the pin 3 and the traction head 7. When it is necessary to replenish the lubricating oil, the sealing cap 26 is removed, and the lubricating oil is poured into the oil reservoir 6 through the oil filling port 25 for storage.

[0028] In this embodiment, the buffer assembly includes a mounting base 28, a limiting post 29 fixedly mounted on the mounting base 28, a connecting seat 30 slidably mounted on the limiting post 29, a connecting plate 31 fixedly mounted on the connecting seat 30, and the connecting plate 31 fixedly mounted on the traction seat 1 by bolts. A buffer spring 32 is fitted at the bottom end of the limiting post 29, and both ends of the buffer spring 32 are connected to the inner walls of the connecting seat 30 and the mounting base 28, respectively. A damping rod 33 is fixedly mounted at the top of the inner wall of the mounting base 28, and the telescopic end of the damping rod 33 is fixedly connected to the connecting seat 30. When the traction vehicle vibrates, the connecting seat 30 will slide along the limiting post 29, causing elastic deformation of the buffer spring 32. The buffer spring 32 buffers the vibration, and the damping rod 33 will dampen the vibration, further buffering the vibration.

[0029] In use, the mounting base 28 is fixedly installed on the tractor, and the tow bar 2 is installed on the trailer. When the tow bar 2 is connected to the tow seat 1, the tow head 7 is installed into the slot 14. Then, the adjusting knob 11 is rotated to make the pin 3 rise and insert into the connecting hole 8, and abut against the oil nozzle, so that the plug 18 is squeezed upward. At this time, the lubricating oil in the oil can 6 is slowly injected into the oil filling hole 5, and seeps out from the oil outlet hole 4 through the oil filling hole 5, thereby lubricating the connection between the pin 3 and the tow head 7, reducing the friction between the two, reducing wear, and helping to extend the service life of the tow device. In addition, when encountering road conditions with large undulations, the pin 3 drives the tow head 7 and the tow bar 2 to bend back and forth, which helps to improve the stability of the vehicle.

[0030] The above embodiments are merely exemplary embodiments of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this utility model within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this utility model.

Claims

1. A trailer connecting device, comprising a towing seat (1) and a towing rod (2), wherein the towing seat (1) is provided with a docking assembly for connecting the towing seat (1) and the towing rod (2), characterized in that: The docking assembly includes a pin (3), a number of oil outlet holes (4) are provided in the middle of the pin (3), an oil injection hole (5) is provided at the top center of the pin (3), an oil can (6) is fixedly installed on the top of the traction seat (1), an oil injection nozzle is installed on the oil can (6), a traction head (7) is rotatably installed on the end of the traction rod (2) near the traction seat (1), a connecting hole (8) matching the pin (3) is provided on the traction head (7), and a buffer assembly is provided on the side of the traction seat (1) away from the traction rod (2).

2. A trailer coupling device according to claim 1, characterised in that The docking assembly also includes an adjusting screw (9) and a guide rod (10). The traction seat (1) has a hollow structure. The adjusting screw (9) is rotatably mounted on the inner walls of the upper and lower sides of the traction seat (1). An adjusting knob (11) is fixedly mounted on the top of the adjusting screw (9). The guide rod (10) is parallel to the adjusting screw (9). The guide rod (10) is fixedly mounted on the inner walls of the upper and lower sides of the traction seat (1). A connecting rod (12) is slidably mounted on the guide rod (10). A threaded hole (13) matching the adjusting screw (9) is opened on the connecting rod (12). The connecting rod (12) is fixedly mounted on the bottom end of the pin (3).

3. A trailer coupling device according to claim 2, characterized in that, The traction seat (1) has a slot (14) on its right side wall. The upper and lower side walls of the slot (14) are provided with through holes (15) that match the pin (3). The pin (3) is slidably installed in the through hole (15). The oil injection nozzle is coaxially arranged with the pin (3).

4. A trailer connection device according to claim 3, characterised in that The oil nozzle includes an oil nozzle shell (16), the oil nozzle shell (16) has a cavity (17) inside, a plug (18) is slidably installed at the bottom end of the cavity (17), a truncated cone (19) is provided at the top end of the plug (18), a conical surface (20) matching the truncated cone (19) is provided on the bottom side wall of the cavity (17), a first oil passage (21) is provided on the side wall of the truncated cone (19), a second oil passage (22) connected to the first oil passage (21) is provided at the center of the plug (18), a return spring (23) is fitted between the plug (18) and the top wall of the cavity (17), and a number of sets of oil inlet holes (24) are provided on the top wall of the cavity (17).

5. A trailer connection device according to claim 4, characterised in that The top of the oil container (6) is provided with an oil filling port (25), and a sealing cap (26) is installed at the end of the oil filling port (25).

6. A trailer connector assembly according to claim 1, wherein, The traction rod (2) and the traction head (7) are connected to each other by a connecting shaft (27), and the connecting shaft (27) and the pin (3) are perpendicular to each other.

7. A trailer connector assembly according to claim 1, wherein, The buffer assembly includes a mounting base (28), on which a limiting post (29) is fixedly mounted. A connecting seat (30) is slidably mounted on the limiting post (29). A connecting plate (31) is fixedly mounted on the connecting seat (30). The connecting plate (31) is fixedly mounted on the traction seat (1). A buffer spring (32) is fitted at the bottom end of the limiting post (29). Both ends of the buffer spring (32) abut against the inner walls of the connecting seat (30) and the mounting base (28), respectively. A damping rod (33) is fixedly mounted on the top of the inner wall of the mounting base (28). The telescopic end of the damping rod (33) is fixedly connected to the connecting seat (30).

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