Self locking trailer hitch device

Abstract

The utility model provides a kind of self-locking trailer hook device, it is related to trailer hook technical field, including rotating component, first transmission component, second transmission component, locking piece and trailer hook, rotating component is connected with locking piece by first transmission component;Rotating component is connected with trailer hook by second transmission component, and trailer hook is provided with locking portion;Rotating component can drive locking piece reciprocating movement by first transmission component, rotating component can drive trailer hook rotation by second transmission component, when trailer hook rotates to extend position or retracted position, locking piece can be locked with locking portion;The utility model linkage between locking piece and trailer hook on one hand, can effectively simplify structure, improve operation convenience, on the other hand, can realize self-locking, improve the stability of trailer hook extension state, to ensure the safety and reliability of trailer process, while being able to optimize stress, improve the load carrying capacity of device, prolong the service life of component, reduce production and use cost.

Description

Technical Field

[0001] This utility model relates to the field of trailer hitch technology, specifically to a self-locking trailer hitch device. Background Technology

[0002] With the continuous development of automotive towing technology, the safety, stability, and convenience of trailer hitches, as the core component for realizing vehicle towing functions, have become a key focus of the industry. Currently, most mainstream electric trailer hitch devices on the market rely on planetary gear sets as the core transmission mechanism to achieve the extension and retraction of the trailer hitch. However, in actual use, they have at least the following technical defects.

[0003] On the one hand, the transmission characteristics of the planetary gear set itself determine that after completing the position movement of the trailer hook, it is difficult to form a stable and reliable mechanical locking structure. During the vehicle's operation, if it encounters bumpy roads, emergency braking, or fluctuations in traction load, the trailer hook is prone to unexpected displacement due to vibration, load impact, and other factors. This not only affects the safety of towing operations but may also increase the meshing clearance of gears inside the transmission mechanism, shortening the overall service life of the device.

[0004] On the other hand, the load-bearing capacity of existing electric trailer hooks is insufficient. The gear meshing method and structural design of planetary gear sets focus more on achieving efficient transmission than on withstanding continuous large load impacts. When towing heavy loads, the gear teeth are prone to wear, deformation, or even breakage, which cannot meet the requirements of high-load conditions and seriously limits the application scope of electric trailer hook devices. Utility Model Content

[0005] The purpose of this utility model is to provide a self-locking trailer hitch device to solve the above-mentioned technical problems existing in the prior art; the preferred technical solution among the many technical solutions provided by this utility model can produce many technical effects, as detailed below.

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

[0007] This utility model provides a self-locking trailer hook device, comprising a rotating assembly, a first transmission assembly, a second transmission assembly, a locking member, and a trailer hook, wherein: the rotating assembly is connected to the locking member through the first transmission assembly; the rotating assembly is connected to the trailer hook through the second transmission assembly, and the trailer hook is provided with a locking part; the rotating assembly can drive the locking member to reciprocate through the first transmission assembly, and the rotating assembly can drive the trailer hook to rotate through the second transmission assembly; when the trailer hook rotates to the extended position or the retracted position, the locking member can lock with the locking part.

[0008] Preferably, the rotating assembly includes an active rotating block and a driven rotating block, wherein: the active rotating block is connected to the rotation output end of the power device; when the active rotating block rotates to the first position, it can connect with the driven rotating block and drive the driven rotating block to rotate synchronously; the driven rotating block is connected to the first transmission assembly; when the active rotating block and the driven rotating block rotate to the second position, they can connect with the second transmission assembly.

[0009] Preferably, the rotating assembly includes a positioning block, an elastic element, and a positioning rolling element, wherein: the positioning block is provided with a guide ramp, and the active rotating block can slide along the guide ramp past the positioning block and move to the first position when rotating forward; the elastic element abuts against the active rotating block, and when the active rotating block slides to the guide ramp, the positioning block pushes the active rotating block to move axially and compresses the elastic element; the positioning rolling element is rotatably disposed on the driven rotating block, and the active rotating block has a guide channel for the rotation of the positioning rolling element, and the end of the guide channel is provided with a positioning hole, so that when the active rotating block rotates to the first position, the positioning rolling element is located in the positioning hole.

[0010] Preferably, the first transmission assembly includes a fixed base assembly, a moving block, and a slider, wherein: the fixed base assembly is provided with a mounting groove, the moving block is rotatably disposed in the mounting groove, the moving block abuts against the driven rotating block, and the driven rotating block can drive the moving block to rotate when rotating forward; the moving block is provided with a transmission slide rail; the fixed base assembly is provided with a sliding groove, the slider is slidably disposed in the sliding groove, the slider is provided with a sliding part, the sliding part is inserted into the transmission slide rail and can slide and cooperate with the transmission slide rail, and the slider is provided with an abutment part; the fixed base assembly is provided with a guide groove, and the locking member is slidably disposed in the guide groove; when the sliding part slides to the far end of the transmission slide rail, the abutment part pushes the locking member to lock with the corresponding locking part, and the trailer hook rotates to the extended position or the retracted position.

[0011] Preferably, the fixing base assembly includes a first fixing base, a second fixing base, and a fixing bracket connected in sequence, wherein: the mounting groove is disposed on the first fixing base; the sliding groove is disposed on the second fixing base; and the guide groove is disposed within the fixing bracket.

[0012] Preferably, the trailer hook includes a housing and a hook body integrally connected to the outer wall of the housing, wherein: a cylindrical cavity is provided inside the housing, the housing covers the fixed base assembly, the slider and the locking member are both located in the cylindrical cavity, a locking groove is provided on the inner peripheral wall of the cylindrical cavity, the locking member is configured as a locking shaft adapted to the locking groove, and the locking groove forms the locking part.

[0013] Preferably, the self-locking trailer hook device further includes a housing, wherein: the housing and the casing are disposed opposite to each other on both sides of the fixed base assembly; the rotating component is located inside the housing.

[0014] Preferably, the slider is provided with a clearance groove, and when the trailer hook rotates between the extended position and the retracted position, the cavity wall of the cylindrical cavity can push the locking member to move into the clearance groove.

[0015] Preferably, the number of the locking member, the locking groove, and the clearance groove are all set to be multiple.

[0016] Preferably, the second transmission assembly includes a spindle, wherein: a first end of the spindle is provided with a stop portion, and when the driving rotating block and the driven rotating block rotate to the second position, the driven rotating block abuts against the stop portion; the second end of the spindle is connected to the trailer hook and rotates synchronously with the trailer hook.

[0017] The self-locking trailer hitch device provided by this utility model has at least the following beneficial effects:

[0018] 1. Automatic self-locking after the trailer hitch extends / retracts significantly improves safety.

[0019] This invention uses a rotating component to drive a first transmission component and a second transmission component, linking the rotational movement (extension / retraction) of the trailer hook with the reciprocating movement of the locking component. After the rotating component drives the trailer hook to the extended or retracted position via the second transmission component, the first transmission component moves the locking component to a position where it engages with the locking part of the trailer hook, achieving automatic locking without additional operation. This effectively ensures the stability of the trailer hook in the extended state. Even on bumpy roads, during emergency braking, or under fluctuating load conditions, the stable engagement of the locking component and the locking part ensures the trailer hook remains in the target position, effectively preventing trailer detachment, device failure, and other safety accidents, significantly improving the safety and reliability of the traction system.

[0020] II. Optimize the stress structure to improve the overall load-bearing capacity of the device.

[0021] This invention, on the one hand, connects the rotating component and the locking component, and the rotating component and the trailer hitch respectively through the first transmission component and the second transmission component, so that the driving force of the rotating component can be accurately transmitted to the corresponding parts through different paths, avoiding deformation or breakage caused by force concentration in a single transmission path; on the other hand, the locking part of the trailer hitch and the locking structure of the locking component adopt a high-strength fit design, which can form a stable force support point after locking, and evenly distribute the traction load to the locking component, the transmission component and the vehicle body connection part, avoiding excessive local force, thereby effectively improving the overall load bearing capacity.

[0022] Third, simplify the structural design, reduce costs, and improve ease of operation.

[0023] This invention achieves self-locking and telescopic linkage through the cooperation of a rotating component, a first transmission component, and a second transmission component. It eliminates the need for a separate locking drive module or manual locking mechanism, significantly simplifying the overall structure and reducing manufacturing costs and assembly difficulty compared to methods using additional locking structures. Furthermore, since the locking action is linked to the trailer hook telescopic action, the user only needs to control the start and stop of the rotating component to complete the entire "telescopic + locking" operation, without requiring additional locking or unlocking operations. This significantly improves operational convenience and is particularly suitable for applications requiring frequent switching of trailer hook states.

[0024] IV. Improve the stability and service life of the lifting device.

[0025] The tight locking of the locking component and the locking part of this utility model can limit the radial and axial movement of the trailer hook and reduce the wear of the connection between the transmission component and the trailer hook; at the same time, the distributed force design can avoid fatigue damage caused by long-term concentrated force on the components and extend the service life of the device. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the assembly from one perspective of this utility model;

[0028] Figure 2 This is an assembly diagram from another perspective of this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of this utility model from one perspective;

[0030] Figure 4 This is a structural schematic diagram from another perspective of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the rotating component of this utility model;

[0032] Figure 6 This is a schematic diagram of the assembly of the rotating component of this utility model from one perspective;

[0033] Figure 7 This is an assembly schematic diagram of the rotating component of this utility model from another perspective;

[0034] Figure 8 This is a schematic diagram of the structure of the first transmission component of this utility model;

[0035] Figure 9 This is a schematic diagram of the assembly of the first transmission component of this utility model from one perspective;

[0036] Figure 10 This is an assembly schematic diagram of the first transmission component of this utility model from another perspective;

[0037] Figure 11 This is a schematic diagram of the structure of the second transmission component of this utility model;

[0038] Figure 12 This is a schematic diagram of the assembly of the second transmission component of this utility model from one perspective;

[0039] Figure 13 This is an assembly schematic diagram of the second transmission component of this utility model from another perspective;

[0040] Figure 14 This is a schematic diagram of the locking state of the locking member and the locking part of this utility model;

[0041] Figure 15 This is a schematic diagram showing the separation state of the locking component and the locking part of this utility model;

[0042] Figure 16 This is a schematic diagram showing the position of the sliding part of this utility model at the far end of the transmission slide.

[0043] Figure 17 This is a schematic diagram showing the position of the sliding part of this utility model at the near end of the transmission slide.

[0044] Figure 18 This is a schematic diagram showing the position of the slider of this utility model pushing the locking member out of the clearance groove;

[0045] Figure 19 This is a schematic diagram showing the position of the locking member being inserted into the relief groove in the cavity wall of this utility model.

[0046] Figure Labels

[0047] 1. Rotating assembly; 11. Active rotating block; 12. Driven rotating block; 121. Guide channel; 13. Positioning block; 131. Guide ramp; 14. Elastic element; 15. Positioning rolling element; 2. First transmission assembly; 21. Fixed seat assembly; 211. First fixed seat; 2111. Mounting groove; 212. Second fixed seat; 2121. Slide groove; 213. Fixed bracket; 2131. Guide groove; 22. Moving block; 221. Transmission slide; 23. Slider; 231. Sliding part; 232. Abutting part; 233. Relief groove; 3. Second transmission assembly; 31. Spindle; 311. Abutting part; 4. Locking element; 41. Locking shaft; 5. Trailer hook; 51. Housing; 511. Cylindrical cavity; 512. Locking groove; 52. Hook body; 6. Outer shell. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0049] Example 1:

[0050] This utility model provides a self-locking trailer hitch device, see reference. Figures 1 to 19 As shown, the self-locking trailer hook device includes a rotating assembly 1, a first transmission assembly 2, a second transmission assembly 3, a locking element 4, and a trailer hook 5.

[0051] The rotating assembly 1 is connected to the locking member 4 via the first transmission assembly 2; the rotating assembly 1 is connected to the trailer hook 5 via the second transmission assembly 3, the trailer hook 5 is provided with a locking part, the locking part is adapted to the locking member 4; the rotating assembly 1 is connected to the rotating output end of the power device, the rotation of the rotating assembly 1 can drive the locking member 4 to reciprocate through the first transmission assembly 2, and the rotation of the rotating assembly 1 can drive the trailer hook 5 to rotate through the second transmission assembly 3.

[0052] When not in operation, the locking member 4 is locked with the locking part, and the trailer hook 5 is in the retracted state.

[0053] When towing, the rotating component 1 rotates forward under the drive of the power unit. The rotating component 1 rotates forward and drives the locking member 4 to move forward through the first transmission component 2. The rotating component 1 rotates forward and drives the trailer hook 5 to rotate forward through the second transmission component 3 until the trailer hook 5 rotates to the extended state. The locking member 4 locks with the locking part and the extended state is stable. Then the towing can be carried out.

[0054] After the trailer is completed, the rotating component 1 rotates in the opposite direction under the drive of the power unit. The reverse rotating component 1 drives the locking member 4 to move in the opposite direction through the first transmission component 2. The flipped rotating component 1 drives the trailer hook to rotate in the opposite direction through the second transmission component 3 until the trailer hook 5 rotates to the retracted state, the locking member 4 locks with the locking part, and the retracted state is stable.

[0055] In the aforementioned process, on the one hand, the rotating component 1 achieves the linkage action between the locking component 4 and the trailer hook 5 through the first transmission component 2 and the second transmission component 3, which can effectively simplify the structure and improve the ease of operation. On the other hand, when the trailer hook 5 is in the extended or retracted state, the locking component 4 can lock with the locking part, which can not only effectively improve the stability of the trailer hook in the extended state and ensure the safety and reliability during the towing process, but also optimize the force and improve the load-bearing capacity of the device. At the same time, it can limit the radial or axial movement of the trailer hook during the towing process, reduce the wear of the connection between the transmission component and the trailer hook, thereby ensuring the service life of the device and reducing the production and use costs of the device.

[0056] Example 2

[0057] Example 2 is based on Example 1:

[0058] like Figures 1 to 19 As shown, the rotating component 1 includes an active rotating block 11 and a driven rotating block 12. The active rotating block 11 is fan-shaped and is connected to the rotation output end of the power device. The power device can be an electric power device, including a motor, etc. The driven rotating block 12 is fan-shaped and is connected to the first transmission component 2.

[0059] During the extension action, when the active rotating block 11 rotates forward to the first position under the drive of the power device, it is connected to the driven rotating block 12. Thereafter, the active rotating block 11 drives the driven rotating block 12 to rotate synchronously. When the active rotating block 11 and the driven rotating block 12 rotate forward to the second position, the driven rotating block 12 is connected to the second transmission component 3.

[0060] The timing linkage setting enables the movement of the locking component 4 and the rotation of the trailer hook 5 to form a sequential action logic, completely avoiding structural interference caused by synchronous start-up of the two, and further improving the continuity of telescopic and self-locking actions.

[0061] As an optional implementation, the rotating assembly 1 includes a positioning block 13, an elastic element 14, and a positioning rolling element 15.

[0062] The positioning block 13 is provided with a guide ramp 131, which has a guiding function. During the forward rotation of the active rotating block 11, it can slide along the guide ramp 131 and pass over the positioning block 13, thereby moving to the first position. The setting of the guide ramp 131 enables the active rotating block 11 to move smoothly to the first position, thereby ensuring the connection effect between the active rotating block 11 and the driven rotating block 12.

[0063] Furthermore, the positioning block 13 is symmetrically provided with another guide ramp on the guide ramp 131 to facilitate the smooth reversal of the active rotating block 11 and its smooth sliding over the positioning block 13.

[0064] The elastic element 14 abuts against the active rotating block 11. When the active rotating block 11 slides to the guide ramp 131, the positioning block 13 pushes the active rotating block 11 to move axially and compresses the elastic element 14. The elastic element 14 provides thrust to the active rotating block 11 so that it can be firmly and stably connected to the driven rotating block 12 when it is in the first position. At the same time, it can achieve elastic compression without affecting the movement of the active rotating block 11.

[0065] The positioning rolling element 15 is configured as a ball bearing, which is rotatably mounted on the driven rotating block 12. The driving rotating block 11 is provided with a guide channel 121, which is an arc-shaped channel that provides a rotation trajectory for the positioning rolling element 15. The end of the guide channel 121 is provided with a positioning hole. When the driving rotating block 11 rotates to the first position, the driving rotating block 11, under the thrust of the elastic element 14, makes the positioning rolling element 15 firmly locked in the positioning hole, ensuring the positioning connection effect of the driving rotating block 11 and the driven rotating block 12.

[0066] As an optional implementation, the first transmission assembly 2 includes a fixed base assembly 21, a moving block 22, and a slider 23.

[0067] The fixed base assembly 21 is provided with a mounting groove 2111, and the moving block 22 is rotatably disposed in the mounting groove 2111. The moving block 22 abuts against the driven rotating block 12. When the driven rotating block 12 rotates forward, it can drive the moving block 22 to rotate synchronously. The moving block 22 is provided with a transmission slide 221.

[0068] Specifically, the transmission slide 221 is configured as a flat round slide, which is composed of a semi-elliptical arc slide and a semi-circular arc slide. The semi-elliptical arc slide is the variable diameter distal slide, which corresponds to the sliding stroke of the slider 23 and the extension and retraction of the locking member 4. The semi-circular arc slide is the proximal slide, which corresponds to the rotation of the trailer hook 5.

[0069] The fixed base assembly 21 is provided with a slide groove 2121, and the slider 23 is slidably disposed in the slide groove 2121. The slider 23 is provided with a sliding part 231, which is a sliding shaft. The sliding shaft is adapted to the transmission slide 221. The sliding part 231 is inserted into the transmission slide 221 and slides in cooperation with the transmission slide 221. The slider 23 is provided with an abutment part 232.

[0070] The fixed base assembly 21 is provided with a guide groove 2131, and the locking member 4 is adapted to the guide groove 2131. The locking member 4 is slidably disposed in the guide groove 2131.

[0071] When the sliding part 231 slides to the far end of the transmission slide 221, the abutment part 232 pushes the locking member 4 to lock with the corresponding locking part. At this time, the trailer hook 5 rotates to the extended position or the retracted position, and the position is locked.

[0072] This configuration effectively converts the rotation of the driven rotating block 12 into the movement of the slider 23, thereby driving the locking member 4 to move and achieve locking, resulting in a significant transmission effect.

[0073] As an optional implementation, the mounting bracket 21 includes a first mounting bracket 211, a second mounting bracket 212, and a mounting support 213 that are detachably connected in sequence.

[0074] The mounting groove 2111 is provided on the first fixed seat 211, the sliding groove 2121 is provided on the second fixed seat 212, and the guide groove 2131 is provided in the fixed bracket 213.

[0075] In practical applications, the first fixed base 211, the second fixed base 212 and the fixed bracket 213 are manufactured separately to facilitate assembly and subsequent maintenance.

[0076] As an optional implementation, the trailer hook 5 includes a housing 51 and a hook body 52 integrally connected to the outer wall of the housing 51. The integral arrangement provides a robust structure and ensures load-bearing capacity.

[0077] A cylindrical cavity 511 is provided inside the housing 51, and the housing 51 covers the fixed base assembly 21. The slider 23 and the locking member 4 are both located inside the cylindrical cavity 511. The inner peripheral wall of the cylindrical cavity 511 is provided with a locking groove 512. The locking member 4 is set as a locking shaft 41 that is adapted to the locking groove 512. The locking groove 512 forms the locking part. The shaft groove locking structure is adopted, which is simple in structure and has a significant locking effect.

[0078] As an optional implementation, the self-locking trailer hook device further includes a housing 6, with the housing 6 and the casing 51 disposed opposite each other on both sides of the fixed base assembly 21, and the rotating component 1 located inside the housing 6.

[0079] The housing 51 and the outer shell 6 work together to effectively protect the internal components, while making the structure more compact and the appearance more regular without affecting the transmission effect.

[0080] As an optional implementation, the slider 23 is provided with a clearance groove 233. When the trailer hook 5 rotates between the extended position and the retracted position, the cavity wall of the cylindrical cavity 511 can push the locking member 4 to move into the clearance groove 233.

[0081] The clearance groove 233 mainly serves to make way, effectively eliminating the motion interference between the trailer hook 5 and the locking part 4 when the trailer hook 5 rotates.

[0082] As an optional implementation, the number of locking member 4, locking groove 512 and clearance groove 233 are all set to multiple.

[0083] Specifically, the number of locking parts 4, locking grooves 512 and clearance grooves 233 are all set to 4, and their positions correspond one-to-one. Furthermore, the locking parts 4 are divided into two groups and arranged opposite each other. When the trailer hook 5 is in the extended or retracted state, the two groups of locking parts 4 and locking grooves 512 lock together. The circumferentially distributed locking force can effectively resist the radial torque and axial tension during the towing process, thereby effectively ensuring the static load borne by the trailer hook 5.

[0084] As an optional implementation, the second transmission assembly 3 includes a spindle 31, and a stop portion 311 is provided at the first end of the spindle 31. The stop portion 311 is configured as a stop block and is fan-shaped.

[0085] When the active rotating block 11 and the driven rotating block 12 rotate to the second position, the driven rotating block 12 abuts against the blocking part 311, and at this time the spindle 31 rotates synchronously with the active rotating block 11 and the driven rotating block 12.

[0086] The second end of the spindle 31 passes through the first fixed seat 211, the moving block 22, the second fixed seat 212, the slider 23 and the fixed bracket 213 in sequence, and is connected to the trailer hook 5. The spindle 31 rotates synchronously with the trailer hook 5.

[0087] The extension self-locking action process of this utility model is as follows:

[0088] In the initial state, the active rotating block 11 is located in the initial position and separated from the driven rotating block 12. The sliding part 231 is located at the far end of the transmission slide 221. The locking member 4 is locked into the trailer hook 5, and the trailer hook 5 is stably locked in the retracted state.

[0089] When the extension action is performed, the active rotating block 11 rotates forward and slides past the positioning block 13. When it rotates forward to 90°, it connects with the driven rotating block 12 and abuts against the moving block 22. After that, the active rotating block 11, the driven rotating block 12 and the moving block 22 rotate synchronously.

[0090] When the active rotating block 11 continues to rotate forward to 180°, the driven rotating block 12 and the moving block 22 rotate forward 90°. The driven rotating block 12 abuts against the spindle 31, and the locking member 4 slides completely into the relief groove 233. After that, the spindle 31, the trailer hook 5, the active rotating block 11, the driven rotating block 12 and the moving block 22 rotate synchronously.

[0091] When the active rotating block 11 continues to rotate clockwise to 360°, the driven rotating block 12 and the moving block 22 rotate 270°, and the spindle 31 and the trailer hook 5 rotate 180°. At this time, the trailer hook 5 is in the extended state.

[0092] When the active rotating block 11 continues to rotate clockwise to 450°, the driven rotating block 12 and the moving block 22 rotate 360°, the sliding part 231 moves to the far end of the transmission slide 221, the locking member 4 locks with the locking part, and the trailer hook 5 is locked to the extended state.

[0093] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0094] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" or "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0095] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0096] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A self-locking trailer hitch device, characterized in that, Includes a rotating assembly, a first transmission assembly, a second transmission assembly, a locking element, and a trailer hitch, wherein: The rotating component is connected to the locking component via the first transmission component; The rotating assembly is connected to the trailer hook via the second transmission assembly, and the trailer hook is provided with a locking part; The rotating component can drive the locking member to reciprocate through the first transmission component, and the rotating component can drive the trailer hook to rotate through the second transmission component. When the trailer hook rotates to the extended position or the retracted position, the locking member can lock with the locking part.

2. The self-locking trailer hitch device according to claim 1, characterized in that, The rotating assembly includes an active rotating block and a driven rotating block, wherein: The active rotating block is connected to the rotation output end of the power device. When the active rotating block rotates to the first position, it can connect with the driven rotating block and drive the driven rotating block to rotate synchronously. The driven rotating block is connected to the first transmission component, and the driving rotating block and the driven rotating block can be connected to the second transmission component when they rotate to the second position.

3. The self-locking trailer hitch device according to claim 2, characterized in that, The rotating assembly includes a positioning block, an elastic element, and a positioning rolling element, wherein: The positioning block is provided with a guide ramp, and the active rotating block can slide along the guide ramp over the positioning block and move to the first position when rotating in the forward direction; The elastic element abuts against the active rotating block. When the active rotating block slides to the guide ramp, the positioning block pushes the active rotating block to move axially and compresses the elastic element. The positioning rolling element is rotatably mounted on the driven rotating block. The active rotating block has a guide channel for the rotation of the positioning rolling element. The end of the guide channel is provided with a positioning hole. When the active rotating block rotates to the first position, the positioning rolling element is located in the positioning hole.

4. The self-locking trailer hitch device according to claim 2, characterized in that, The first transmission assembly includes a fixed base assembly, a moving block, and a slider, wherein: The fixed base assembly is provided with a mounting groove, the moving block is rotatably disposed in the mounting groove, the moving block abuts against the driven rotating block, the driven rotating block can drive the moving block to rotate when rotating forward, and the moving block is provided with a transmission slide. The fixed base assembly is provided with a slide groove, the slider is slidably disposed in the slide groove, the slider is provided with a sliding part, the sliding part is inserted into the transmission slide and can slide and cooperate with the transmission slide, and the slider is provided with an abutment part; The fixed base assembly is provided with a guide groove, and the locking member is slidably disposed in the guide groove; When the sliding part slides to the far end of the transmission slide, the abutting part pushes the locking member to lock with the corresponding locking part, and the trailer hook rotates to the extended position or the retracted position.

5. The self-locking trailer hitch device according to claim 4, characterized in that, The fixing base assembly includes a first fixing base, a second fixing base, and a fixing bracket connected in sequence, wherein: The mounting slot is disposed on the first fixing base; The slide groove is disposed on the second fixed base; The guide groove is disposed within the fixed bracket.

6. The self-locking trailer hitch device according to claim 4, characterized in that, The trailer hitch includes a housing and a hitch body integrally connected to the outer wall of the housing, wherein: The housing has a cylindrical cavity inside, and the housing covers the fixed base assembly. The slider and the locking member are both located in the cylindrical cavity. The inner peripheral wall of the cylindrical cavity has a locking groove. The locking member is configured as a locking shaft that matches the locking groove. The locking groove forms the locking part.

7. The self-locking trailer hitch device according to claim 6, characterized in that, The self-locking trailer hitch device also includes a housing, wherein: The outer casing and the housing are disposed opposite each other on both sides of the fixing base assembly; The rotating component is located inside the housing.

8. The self-locking trailer hitch device according to claim 7, characterized in that, The slider is provided with a clearance groove. When the trailer hook rotates between the extended position and the retracted position, the cavity wall of the cylindrical cavity can push the locking member to move into the clearance groove.

9. The self-locking trailer hitch device according to claim 8, characterized in that, The number of the locking member, the locking groove, and the clearance groove are all set to be multiple.

10. The self-locking trailer hitch device according to claim 2, characterized in that, The second transmission assembly includes a spindle, wherein: The first end of the mandrel is provided with a stop portion. When the driving rotating block and the driven rotating block rotate to the second position, the driven rotating block abuts against the stop portion. The second end of the mandrel is connected to the trailer hook and rotates synchronously with the trailer hook.

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