Trailer traction device and vehicle

Abstract

The invention discloses a trailer traction device and a vehicle, and belongs to the technical field of vehicles. The trailer traction device comprises a support assembly, a trailer hook, a locking assembly and a driving assembly, the trailer hook is rotationally connected with the support assembly and has an extending position and a containing position, the locking assembly is used for locking and unlocking the trailer hook in a switchable mode, and the driving assembly drives the trailer hook to rotate when the locking assembly unlocks the trailer hook. And the locking assembly is driven to lock the tow hook when the tow hook is located at the extending position and the containing position. According to the trailer traction device, full-automatic operation can be achieved, automatic stretching and automatic storage of the trailer hook can be achieved, automatic locking and automatic unlocking are achieved when the trailer hook is located at the stretching position and the storage position, and use convenience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a trailer traction device and a vehicle including the trailer traction device Background Art

[0002] The fully automatic trailer towing device is mainly used to tow RVs, luggage racks, bicycle racks, small trucks, etc. It is the main component to expand the vehicle's carrying capacity. Its main purpose is to provide convenient and reliable towing solutions for car users who have needs such as camping, traveling, and carrying goods. In the relevant technology, trailer towing devices include mechanical and semi-automatic types. The mechanical type is more widely used, but it is limited by the shape of the rear end of the vehicle CAS. It needs to be manually disassembled after use, and there are disadvantages of multiple disassembly and assembly, which is low in convenience. The semi-automatic type is generally in the form of a winch, which cannot be locked automatically. When using it, the trailer hook needs to be manually unlocked and locked, and the convenience of use is average. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an object of the present invention is to provide a trailer towing device that can achieve fully automated operation, automatic extension and automatic storage of the trailer hook, and automatic locking and automatic unlocking in the extended position and the stored position, thereby improving convenience of use.

[0005] Another object of the present invention is to provide a vehicle, comprising the aforementioned trailer towing device.

[0006] According to an embodiment of the present invention, the trailer towing device includes a bracket assembly, a trailer hook, a locking assembly and a driving assembly. The trailer hook is rotatably connected to the bracket assembly and has an extended position and a stored position. The locking assembly is used to switchably lock and unlock the trailer hook. The driving assembly drives the trailer hook to rotate when the locking assembly unlocks the trailer hook, and drives the locking assembly to lock the trailer hook when the trailer hook is located at the extended position and the stored position.

[0007] The trailer towing device according to the embodiment of the present invention can realize fully automatic operation, realize automatic extension and automatic storage of the trailer hook, and automatically lock and unlock in the extended position and the stored position, thereby improving the convenience of use.

[0008] In addition, the trailer traction device according to the above embodiment of the present invention may also have the following additional technical features:

[0009] Optionally, one of the bracket assembly and the trailer hook includes a first mating portion, and the other includes a second mating portion rotatably connected to the first mating portion, the first mating portion is provided with a mounting hole and the second mating portion is provided with a locking groove, the locking assembly includes a locking block, the locking block is slidably disposed in the mounting hole, and the locking block locks the trailer hook when it extends into the locking groove, and unlocks the trailer hook when it exits the locking groove.

[0010] Optionally, the second matching portion is configured as a sleeve rotatably connected to the outside of the first matching portion, the mounting hole is provided on the first matching portion, and the locking groove is provided on the inner side surface of the second matching portion.

[0011] Optionally, the locking block has a first end, which is slidably engaged with the locking groove along the rotation direction of the trailer hook, and the end face of the first end of the locking block is configured as an arcuate surface extending along the rotation direction of the trailer hook and with the middle portion protruding toward the locking groove; and / or, the locking groove has a first guide surface, which is configured as an arcuate surface extending along the rotation direction of the trailer hook and with the middle portion concave in the direction away from the first mating portion.

[0012] Optionally, the drive assembly includes a drive shaft and a sliding member, the drive shaft is rotatably connected to the bracket assembly, the sliding member is threadedly transmitted with the drive shaft, the sliding member is provided with a flared slide groove, the slide groove has a first locking surface, a second locking surface and a sliding surface, the sliding surface is connected between the first locking surface and the second locking surface, and the first locking surface and the second locking surface are opposite to each other along the axial direction of the drive shaft, wherein the locking assembly is slidably arranged in the slide groove along the axial direction, the locking assembly locks the trailer hook when it abuts against the first locking surface and the second locking surface, and releases the lock of the trailer hook when it abuts against the sliding surface.

[0013] Optionally, the bracket assembly is provided with a guide groove, the guide groove extends along the axial direction, and the sliding member is provided with a guide member, and the guide member is slidably disposed in the guide groove.

[0014] Optionally, the trailer towing device further includes a transmission assembly, the transmission assembly including an active member and a driven member, the active member is connected to the driving assembly, the driven member is connected to the trailer hook, the active member and the driven member are in transmission cooperation and can be released, when the trailer hook is locked, the active member and the driven member are released from transmission, and when the trailer hook is unlocked, the active member and the driven member are in transmission cooperation.

[0015] Optionally, the driving assembly includes a driving shaft, the active member is set as an active end face gear, and the driven member is set as a driven end face gear. The active end face gear is slidably arranged on the driving shaft along the axial direction of the driving shaft and rotates with the driving shaft. The active end face gear is meshed with the driven end face gear along the axial direction of the driving shaft.

[0016] Optionally, the transmission assembly further comprises an elastic member, which is disposed on the bracket assembly and has an elastic force for driving the active member to move toward the driven member.

[0017] Optionally, one of the bracket assembly and the trailer hook is provided with a limit piece, and the other is provided with a limit slot, wherein the limit slot extends along the rotation direction of the trailer hook and has two opposite ends, and the limit piece is movably provided in the limit slot, wherein the limit piece stops at one end of the limit slot in the extended position, and stops at the other end of the limit slot in the stored position.

[0018] Optionally, the bracket assembly includes a trailer bar and a bracket, the bracket is arranged on the trailer bar, the trailer hook is rotatably arranged on the bracket, the trailer hook extends in the front-to-back direction, the trailer bar extends in the left-to-right direction, and the rotation center axis of the trailer hook is inclined in the left-to-right direction from the front-to-back direction.

[0019] Optionally, the driving assembly includes a driving shaft, one end of which is rotatably connected to the bracket assembly, and the other end of which is provided with a positioning piece, and the trailer hook is connected to the driving shaft and is positioned by the positioning piece.

[0020] Optionally, the locking assembly includes a plurality of locking blocks, the trailer hook is provided with a plurality of locking grooves, the plurality of locking blocks and the plurality of locking grooves are arranged along the rotation direction of the trailer hook, and the plurality of locking blocks correspond one-to-one with the plurality of locking grooves and are engaged with each other.

[0021] A vehicle according to an embodiment of the present invention comprises the trailer towing device mentioned above.

[0022] The vehicle according to the embodiment of the present invention can meet the automation requirements of vehicle towing by applying the aforementioned trailer towing device without affecting the vehicle's styling and layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of a trailer towing device in some embodiments of the present invention (the trailer hook is in the extended position).

[0024] Figure 2 is a cross-sectional view of a trailer traction device in some embodiments of the present invention.

[0025] Figure 3is an exploded view of a trailer traction device in some embodiments of the present invention.

[0026] Figure 4 yes Figure 2 CC cross-sectional view of the embodiment.

[0027] Figure 5 yes Figure 2 DD cross-sectional view of the embodiment.

[0028] Figure 6 Schematic diagram of a trailer hook in some embodiments of the present invention.

[0029] Figure 7 Schematic diagram of the second frame and the first matching portion in some embodiments of the present invention.

[0030] Figure 8 Schematic diagram of a sliding member in some embodiments of the present invention.

[0031] Reference numerals:

[0032] Trailer towing device 100, bracket assembly 10, first matching portion 11, mounting hole 111, limiting member 112, guide groove 113, trailer bar 12, bracket 13, first frame 131, second frame 132, trailer hook 20, second matching portion 21, locking groove 22, first guide surface 221, limiting groove 23, locking assembly 30, locking block 31, first end 301, second end 302, driving assembly 40, driving shaft 41, sliding member 42, sliding groove 421, first locking surface 4211, sliding surface 4212, second locking surface 4213, guide member 422, driving member 43, transmission assembly 50, active member 51, driven member 52, elastic member 53, positioning member 60, axial direction AA, rotation direction BB. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] The present invention proposes a trailer towing device 100 and a vehicle. The trailer towing device 100 can realize fully automatic operation, can realize automatic extension and automatic storage of the trailer hook 20, and can automatically lock and unlock in the extended position and the stored position, thereby improving the convenience of use.

[0035] Reference Figures 1 to 7According to the trailer towing device 100 according to the embodiment of the present invention, the trailer towing device 100 includes a bracket assembly 10, a trailer hook 20, a locking assembly 30 and a driving assembly 40.

[0036] Among them, the trailer hook 20 is rotatably connected to the bracket assembly 10 and has an extended position and a storage position. The locking assembly 30 is used to switchably lock and unlock the trailer hook 20. The driving assembly 40 drives the trailer hook 20 to rotate when the locking assembly 30 unlocks the trailer hook 20, and drives the locking assembly 30 to lock the trailer hook 20 when the trailer hook 20 is in the extended position and the storage position; in this way, the extension and storage of the trailer hook 20 can be automated, and it can be automatically locked and unlocked when extended and stored.

[0037] Specifically, the bracket assembly 10 can be connected to the body of the vehicle, and the trailer hook 20 is rotatably connected to the bracket assembly 10. When the locking assembly 30 unlocks the trailer hook 20, the driving assembly 40 can drive the trailer hook 20 to rotate relative to the bracket assembly 10, so that the trailer hook 20 moves between the extended position and the storage position, and the driving assembly 40 can drive the locking assembly 30 to lock the trailer hook 20 when the trailer hook 20 is in the extended position and the storage position, so that the trailer hook 20 is positioned in the extended position and the storage position, which is convenient for the trailer hook 20 to stably tow the load, or to facilitate the trailer hook 20 to be stably stored in the vehicle, and then when the trailer hook 20 needs to be rotated, the driving assembly 40 can release the drive of the locking assembly 30, so that the locking assembly 30 releases the lock of the trailer hook 20.

[0038] For example, when the trailer hook 20 needs to be extended, the trailer hook 20 is in an unlocked state, and the driving assembly 40 drives the trailer hook 20 to rotate relative to the bracket assembly 10 to the extended position. At this time, the driving assembly 40 can drive the locking assembly 30 to lock the trailer hook 20, so that the trailer hook 20 remains in the extended position. When the trailer hook 20 needs to be stored, the trailer hook 20 is in an unlocked state, and the driving assembly 40 drives the trailer hook 20 to rotate relative to the bracket assembly 10 to the stored position. At this time, the driving assembly 40 can drive the locking assembly 30 to lock the trailer hook 20, so that the trailer hook 20 remains in the stored position.

[0039] Therefore, the trailer towing device 100 according to the embodiment of the present invention can realize fully automated operation, can realize automatic extension and automatic storage of the trailer hook 20, and can automatically lock and unlock in the extended position and the stored position, thereby improving the convenience of use.

[0040] Reference Figures 1 to 7In some embodiments of the present invention, one of the bracket assembly 10 and the trailer hook 20 includes a first matching portion 11, and the other includes a second matching portion 21 rotatably connected to the first matching portion 11, the first matching portion 11 is provided with a mounting hole 111 and the second matching portion 21 is provided with a locking groove 22, the locking assembly 30 includes a locking block 31, the locking block 31 is slidably provided in the mounting hole 111, and the locking block 31 locks the trailer hook 20 when it extends into the locking groove 22, and unlocks the trailer hook 20 when it exits the locking groove 22, so that the trailer hook 20 can be automatically locked and unlocked, and the automation of the trailer hook 20 can be realized.

[0041] Specifically, in some examples, the bracket assembly 10 may include a first matching portion 11, the trailer hook 20 may include a second matching portion 21, and the locking block 31 may be slidably disposed in the mounting hole 111 of the first matching portion 11; when the trailer hook 20 is in the extended position and the stored position, the driving assembly 40 may drive the locking block 31 to slide in the mounting hole 111 and move toward the locking groove 22 to extend into the locking groove 22, thereby locking the trailer hook 20 in the extended position and the stored position; when the trailer hook 20 needs to be unlocked, the driving assembly 40 may release the drive on the locking block 31, unlock the trailer hook 20 in the extended position and the stored position, and then the locking block 31 in the locking groove 22 is driven by the pressure of the trailer hook 20 when the trailer hook 20 rotates and exits the locking groove 22.

[0042] More specifically, the trailer hook 20 rotates relative to the bracket assembly 10 and has a central axis of rotation; the mounting hole 111 and the locking groove 22 are opposite to each other in the radial direction of the trailer hook 20, and the locking block 31 is set in the locking groove 22 along the radial sliding direction of the trailer hook 20. The locking block 31 is driven by the driving assembly 40 and is guided by the mounting hole 111 to move along the radial direction of the trailer hook 20 to extend out of the locking groove 22. At this time, the locking block 31 limits the circumferential position of the trailer hook 20 to achieve locking of the trailer hook 20.

[0043] Of course, in other examples, the bracket assembly 10 may include a second matching portion 21, and the trailer hook 20 may include a first matching portion 11 to achieve the aforementioned locking and unlocking of the trailer hook 20. The principles of locking and unlocking are the same as those described above and will not be repeated here.

[0044] Reference Figures 1 to 6 In some embodiments of the present invention, the second matching portion 21 is configured as a sleeve rotatably connected to the outside of the first matching portion 11, the mounting hole 111 is provided on the first matching portion 11, and the locking groove 22 is provided on the inner side of the second matching portion 21; in this way, the locking block 31 and the locking groove 22 can be hidden inside the trailer traction device 100 to prevent the trailer traction device 100 from being affected by external interference and affecting normal operation.

[0045] In detail, the second matching portion 21 is sleeved on the outside of the first matching portion 11 and rotates relative to the first matching portion 11. The first matching portion 11 is provided with a mounting hole 111, and the inner side surface of the second matching portion 21 is provided with a locking groove 22. The locking groove 22 is opposite to the mounting hole 111 along the radial direction of the trailer hook 20, and the locking block 31 in the mounting hole 111 can be engaged with the locking groove 22 along the radial direction of the trailer hook 20, thereby locking the trailer hook 20; in the aforementioned process, the first matching portion 11 is set as a sleeve, and the first matching portion 11 can cover the mounting hole 111 and the locking block 31 by pressing, so as to prevent the external environment from interfering with the locking block 31, thereby improving the operating stability of the trailer traction device 100 and facilitating the trailer traction device 100 to be suitable for harsh scenes such as outdoor.

[0046] In more detail, the second matching portion 21 is configured as a sleeve, which has two opposite sides along the axial direction of the trailer hook 20, one side is closed and the other side is open, the first matching portion 11 and the locking block 31 can be assembled from the open side of the sleeve, and a sealing member is provided between the first matching portion 11 and the edge of the open side of the sleeve, and the sealing member is used to improve the sealing performance of the trailer traction device 100, thereby preventing dust and other particulate matter from penetrating into the interior of the trailer traction device 100 and affecting the normal operation of the trailer traction device 100.

[0047] Reference Figure 5 In some embodiments of the present invention, the locking block 31 has a first end 301, and the first end 301 can be slidably matched with the locking groove 22 along the rotation direction of the trailer hook 20. The end surface of the first end 301 of the locking block 31 is set to be an arc-shaped surface extending along the rotation direction of the trailer hook 20 and the middle part is raised toward the locking groove 22; such a setting can realize the automatic unlocking of the trailer hook 20 and realize the automation of the trailer towing device 100.

[0048] Specifically, in combination with the above, the driving component 40 drives the locking block 31 in the mounting hole 111 to slide, so that the locking block 31 can extend into the locking groove 22, thereby locking the trailer hook 20 on the bracket assembly 10; when the trailer hook 20 needs to be unlocked, the driving component 40 can release the lock of the locking block 31, and at this time the driving component 40 can drive the trailer hook 20 to rotate, and at this time the locking groove 22 can press and drive the locking block 31 along the rotation direction of the trailer hook 20, and the edge of the locking groove 22 along the rotation direction can move along the rotation direction from the end of the end face of the first end 301 of the locking block 31 to the middle of the end face, so that the locking block 31 moves away from the locking groove 22 along the radial direction of the trailer hook 20, thereby squeezing the locking block 31 out of the locking groove 22.

[0049] Reference Figure 5 and Figure 6In other embodiments of the present invention, the locking groove 22 has a first guide surface 221, and the first guide surface 221 is configured to extend along the rotation direction of the trailer hook 20, and the middle part is recessed in the direction away from the first matching portion 11. Such a configuration can realize automatic unlocking of the trailer hook 20 and realize the automation of the trailer towing device 100.

[0050] Specifically, in combination with the above, the driving component 40 drives the locking block 31 in the mounting hole 111 to slide, so that the locking block 31 can extend into the locking groove 22, thereby locking the trailer hook 20 on the bracket assembly 10; when the trailer hook 20 needs to be unlocked, the driving component 40 can release the lock of the locking block 31, and at this time the driving component 40 can drive the trailer hook 20 to rotate, and at this time the locking groove 22 can press and drive the locking block 31 along the rotation direction of the trailer hook 20, and the locking block 31 can move along the rotation direction from the middle of the first guide surface 221 of the locking groove 22 to the end of the first guide surface 221, so that the locking block 31 moves away from the locking groove 22 along the radial direction of the trailer hook 20, thereby squeezing the locking block 31 out of the locking groove 22.

[0051] Reference Figure 5 and Figure 6 In some further embodiments of the present invention, the locking block 31 has a first end 301, and the locking groove 22 has a first guide surface 221. The first end 301 of the locking block 31 can be slidably matched with the first guide surface 221 of the locking groove 22 along the rotation direction of the trailer hook 20. The end surface of the first section of the locking block 31 is set to be an arcuate surface extending along the rotation direction of the trailer hook 20 and the middle part is convex toward the locking groove 22. The first guide surface 221 is set to be an arcuate surface extending along the rotation direction of the trailer hook 20 and the middle part is concave in the direction away from the first matching portion 11. In this way, when it is needed When the trailer hook 20 is unlocked, the locking groove 22 can move relative to the locking block 31 along the rotation direction of the trailer hook 20, and the locking groove 22 can be pressed from the end of the end face of the first end 301 of the locking block 31 from the middle of the end face to drive the locking block 31 to move away from the locking groove 22 in the radial direction of the trailer hook 20, and the locking block 31 can be pressed from the middle of the first guide surface 221 of the locking groove 22 to drive it to move away from the locking groove 22 in the radial direction of the trailer hook 20, thereby realizing automatic unlocking of the trailer hook 20 and realizing the automation of the trailer towing device 100.

[0052] Reference Figure 1 , Figure 2 and Figure 8 In some embodiments of the present invention, the driving assembly 40 includes a driving shaft 41 and a sliding member 42 .

[0053] The driving shaft 41 is rotatably connected to the bracket assembly 10, and the sliding member 42 is threadedly transmitted with the driving shaft 41. The sliding member 42 is provided with a flared sliding groove 421, and the sliding groove 421 has a first locking surface 4211, a second locking surface 4213 and a sliding surface 4212. The sliding surface 4212 is connected between the first locking surface 4211 and the second locking surface 4213, and the first locking surface 4211 and the second locking surface 4213 are opposite to each other along the axial direction of the driving shaft 41; wherein, the locking assembly 30 is slidably arranged in the sliding groove 421 along the axial direction, and the locking assembly 30 locks the trailer hook 20 when it abuts against the first locking surface 4211 and the second locking surface 4213, and releases the lock of the trailer hook 20 when it abuts against the sliding surface 4212; in this way, through the cooperation of the driving shaft 41 and the sliding member 42, the locking assembly 30 can be driven to lock and unlock the trailer hook 20, thereby realizing the automation of the trailer traction device 100.

[0054] It can be understood that the first locking surface 4211 may correspond to the trailer hook 20 in the extended position, and the first locking surface 4211 may abut against the driving locking assembly 30 to lock the trailer hook 20 in the extended position; the second locking surface 4213 may correspond to the trailer hook 20 in the stored position, and the second locking surface 4213 may abut against the driving locking assembly 30 to lock the trailer hook 20 in the stored position; the sliding surface 4212 may correspond to the trailer hook 20 between the extended position and the stored position, and the sliding surface 4212 may release the drive of the locking assembly 30, thereby unlocking the trailer hook 20. Of course, in some examples, the first locking surface 4211 may also correspond to the stored position, and the second locking surface 4213 may also correspond to the extended position, and these examples are all within the protection scope of the present invention.

[0055] Specifically, in the axial direction along the drive shaft 41, the first locking surface 4211, the sliding surface 4212 and the second locking surface 4213 are connected in sequence; when the trailer hook 20 switches to the extended position, the drive shaft 41 can drive the trailer hook 20 to rotate to the extended position, and the drive shaft 41 can drive the sliding member 42 to move along the axial direction of the drive shaft 41, so that the locking block 31 slides relatively in the sliding groove 421 along the axial direction of the drive shaft 41, and the locking block 31 switches from corresponding to the sliding surface 4212 to corresponding to the first locking surface 4211, and extends into the locking groove 22 along the radial direction of the drive shaft 41 under the abutment drive of the first locking surface 4211, thereby locking the trailer hook 20 in the extended position.

[0056] Similarly, when the trailer hook 20 switches to the storage position, the drive shaft 41 can drive the trailer hook 20 to rotate to the storage position, and the drive shaft 41 can drive the sliding member 42 to move along the axial direction of the drive shaft 41, so that the locking block 31 slides relatively along the axial direction of the drive shaft 41 in the sliding groove 421, and the locking block 31 switches from corresponding to the sliding surface 4212 to corresponding to the second locking surface 4213, and extends into the locking groove 22 along the radial direction of the drive shaft 41 under the abutment drive of the second locking surface 4213, thereby locking the trailer hook 20 in the storage position.

[0057] In addition, when the locking block 31 corresponds to the sliding surface 4212, the sliding member 42 can release the abutment drive on the locking block 31, so that the trailer hook 20 is in an unlocked state and follows the drive shaft 41 to rotate relative to the bracket assembly 10. The rotating trailer hook 20 can squeeze the locking block 31 in the locking groove 22, so that the locking block 31 corresponds to the sliding surface 4212.

[0058] In combination with the above, when the trailer hook 20 rotates, the locking block 31 corresponds to the sliding surface 4212 of the sliding member 42 and moves axially relative to the sliding surface 4212. It can be understood that the rotation stroke of the trailer hook 20 can be changed by changing the axial size of the sliding surface 4212, thereby improving the applicability of the trailer traction device 100; in addition, the first locking surface 4211 and the second locking surface 4213 can have a predetermined distance in the axial direction, so that after the first locking surface 4211 and the second locking surface 4213 drive the locking block 31 to extend into the locking groove 22, the drive shaft 41 can continue to drive the locking block 31 through the first locking surface 4211 and the second locking surface 4213 to further closely cooperate with the locking groove 22, providing a pre-tightening force for the locking of the trailer hook 20. In this way, when the vehicle encounters adverse conditions such as bumps, the trailer hook 20 can be stably maintained in the extended position and the storage position, thereby greatly improving the working stability of the trailer traction device 100.

[0059] In addition, in some examples, the locking block 31 has a first end 301 and a second end 302 that are opposite to each other along the radial direction of the drive shaft 41, the first end 301 corresponds to the locking groove 22, and the second end 302 corresponds to the slide groove 421. In combination with the foregoing, the first end 301 of the locking block 31 can be engaged with the locking groove 22, and the second end 302 of the locking block 31 can be engaged with the first locking surface 4211, the sliding surface 4212, and the second locking surface 4213 of the slide groove 421, so as to achieve the locking of the trailer hook 20. Stop and unlock; wherein the second end 302 of the locking block 31 has a first abutting surface and a second abutting surface, the first abutting surface is connected to the second abutting surface along the axial direction of the driving shaft 41, the first abutting surface and the second abutting surface are away from each other in the direction away from the driving shaft 41, the first abutting surface can abut and cooperate with the first locking surface 4211, and the second abutting surface can abut and cooperate with the second locking surface 4213, thereby converting the axial movement of the sliding member 42 along the driving shaft 41 into the radial movement of the locking block 31 along the driving shaft 41.

[0060] It should be noted that the slide groove 421 is flared, which can be understood as the first locking surface 4211 and the second locking surface 4213 are away from each other in the direction away from the drive shaft 41, so that the slide groove 421 is flared. In addition, the axial direction of the drive shaft 41 is the same as the axial direction of the trailer hook 20, and the radial direction of the drive shaft 41 is the same as the radial direction of the trailer hook 20.

[0061] Reference Figure 2 and Figure 5 In some embodiments of the present invention, the bracket assembly 10 is provided with a guide groove 113, the guide groove 113 extends in the axial direction, and the sliding member 42 is provided with a guide member 422, and the guide member 422 is slidably arranged in the guide groove 113; specifically, when the driving shaft 41 threadably drives the sliding member 42, the guide member 422 on the sliding member 42 slidably cooperates with the guide groove 113 on the bracket assembly 10 to guide the sliding member 42 to move along the axial direction of the driving shaft 41, thereby realizing stable driving of the locking block 31;

[0062] Furthermore, the guide members 422 include multiple guide members 422, and the guide grooves 113 include multiple guide members 422 and multiple guide grooves 113 are arranged along the rotation direction of the trailer hook 20. The multiple guide members 422 and the multiple guide grooves 113 are respectively slidably matched one by one, thereby further improving the stable operation of the trailer towing device 100.

[0063] Reference Figures 1 to 4In some embodiments of the present invention, the trailer towing device 100 further includes a transmission assembly 50, and the transmission assembly 50 includes an active member 51 and a driven member 52, the active member 51 is connected to the driving assembly 40, and the driven member 52 is connected to the trailer hook 20, the active member 51 and the driven member 52 are in transmission cooperation and can be released, when the trailer hook 20 is locked, the active member 51 and the driven member 52 are released from transmission, and when the trailer hook 20 is unlocked, the active member 51 and the driven member 52 are in transmission cooperation; in this way, the trailer hook 20 is automatically extended and automatically stored, and is automatically locked and automatically unlocked in the extended position and the stored position.

[0064] Specifically, when the trailer hook 20 is in the locked state, the trailer hook 20 cannot rotate relative to the bracket assembly 10, and the driven member 52 is stationary relative to the bracket assembly 10, while the active member 51 can rotate with the drive shaft 41. The active member 51 rotates relative to the driven member 52 and cannot transmit power to the driven member 52, that is, the active member 51 and the driven member 52 are released from the transmission match; when the trailer hook 20 is switched to the unlocked state, the active member 51 and the driven member 52 can be re-engaged, and the drive assembly 40 can drive the trailer hook 20 to rotate between the extended position and the stored position through the active member 51 and the driven member 52. It can be understood that when the trailer hook 20 is in the locked and unlocked state, the drive shaft 41 can still continue to rotate without interference from the trailer hook 20, thereby driving the locking assembly 30 to lock and unlock the trailer hook 20, so that the trailer hook is automatically extended and automatically stored, and automatically locked and automatically unlocked at the extended position and the stored position.

[0065] More specifically, the drive assembly 40 includes a drive shaft 41, an active member 51 is configured as an active end face gear, and a driven member 52 is configured as a driven end face gear. The active end face gear is slidably disposed on the drive shaft 41 along the axial direction of the drive shaft 41 and rotates with the drive shaft 41. The active end face gear and the driven end face gear are meshed along the axial direction of the drive shaft 41. In this way, when the trailer hook 20 is in an unlocked state, the active end face gear and the driven end face gear are meshed along the axial direction of the drive shaft 41, and the drive shaft 41 transmits power to the trailer hook 20 through the active end face gear and the driven end face gear; when the trailer hook 20 is switched to a locked state, the driven end face gear follows the trailer hook 20 to remain stationary relative to the bracket assembly 10, and the active end face gear rotates with the drive shaft 41. The active end face gear can rotate relative to the driven end face gear and slide along the axial direction of the drive shaft 41 to move away from the driven end face gear, thereby releasing the transmission cooperation between the active end face gear and the driven end face gear.

[0066] Furthermore, the transmission assembly 50 also includes an elastic member 53, which is arranged on the bracket assembly 10 and has an elastic force to drive the active member 51 to move toward the driven member 52; it can be understood that when the trailer hook 20 is in a locked state, the active end face gear rotates relative to the driven end face gear, and the end face gear of the active end face gear and the end face gear of the driven end face gear are abutted and driven to overcome the elastic force of the elastic member 53 and move axially away from the driven end face gear; when the trailer hook 20 is switched to an unlocked state, the elastic member 53 can drive the active end face gear to approach the driven end face gear, so that the active end face gear and the driven end face gear are in transmission meshing engagement, which is convenient for stably transmitting the power of the drive shaft 41 to the trailer hook 20, thereby improving the working stability of the trailer traction device 100.

[0067] Reference Figure 3 , Figure 5 and Figure 6 In some embodiments of the present invention, one of the bracket assembly 10 and the trailer hook 20 is provided with a limit piece 112, and the other is provided with a limit groove 23. The limit groove 23 extends along the rotation direction of the trailer hook 20 and has two opposite ends. The limit piece 112 is movably arranged in the limit groove 23. When in the extended position, the limit piece 112 stops at one end of the limit groove 23, and when in the storage position, the limit piece 112 stops at the other end of the limit groove 23. In this way, through the cooperation between the limit piece 112 and the limit groove 23, the trailer hook 20 can be limited between the extended position and the storage position, so as to prevent the trailer hook 20 from exceeding the predetermined stroke and affecting the user's use.

[0068] In some specific examples, the limiting member 112 is provided on the first matching portion 11, the limiting groove 23 is provided on the second matching portion 21, and the limiting member 112 and the limiting groove 23 are matched along the axial direction of the driving shaft 41. In other specific examples, the limiting member 112 is provided on the second matching portion 21, the limiting groove 23 is provided on the first matching portion 11, and the limiting member 112 and the limiting groove 23 are matched along the axial direction of the driving shaft 41.

[0069] Reference Figure 1 In some embodiments of the present invention, the bracket assembly 10 includes a trailer bar 12 and a bracket 13, the bracket 13 is arranged on the trailer bar 12, the trailer hook 20 is rotatably arranged on the bracket 13, the trailer hook 20 extends in the front-to-back direction, the trailer bar 12 extends in the left-to-right direction, and the rotation center axis of the trailer hook 20 is inclined in the left-to-right direction from the front-to-back direction; in this way, the occupied space of the trailer traction device 100 can be reduced and the space layout efficiency of the vehicle can be improved.

[0070] The rotation center axis of the trailer hook 20 is tilted toward the right in the direction from front to back; or, referring to the figure, the rotation center axis of the trailer hook 20 may be tilted toward the left in the direction from front to back;

[0071] Specifically, when the trailer hook 20 is in the extended position, the trailer hook 20 extends in the front-to-back direction. The trailer hook 20 is driven by the drive assembly 40 to rotate to the storage position. At this time, the trailer hook 20 extends in the left-right direction and extends in the same direction as the trailer bar 12. In terms of spatial arrangement, the trailer hook 20 is stored side by side in the trailer bar 12, which can reduce the space occupied by the trailer towing device 100 on the vehicle and improve space utilization.

[0072] In practice, the trailer bar 12 is disposed between the rear bumper and the rear cross beam of the vehicle, and the trailer bar 12 is provided with a first connecting hole and a second connecting hole at opposite ends along the left and right directions, and the first connecting hole and the second connecting hole can be connected to the vehicle body by fasteners.

[0073] In addition, refer to Figure 1 In some specific examples, the bracket 13 includes a first frame 131 and a second frame 132. The first frame 131 is connected to the trailer bar 12 and protrudes rearward relative to the trailer bar 12. The second frame 132 is inclined to the left in the front-to-back direction, and one end is connected to the first frame 131, and the other end is connected to the trailer bar 12, so that the rotation center axis of the trailer hook 20 installed on the second frame 132 can be inclined to the right in the front-to-back direction; and an accommodating space is constructed between the second frame 132 and the first frame 131, and the driving member 43 can be arranged in the accommodating space to reduce external interference with the driving member 43.

[0074] Reference Figures 1 to 3 In some embodiments of the present invention, the driving assembly 40 includes a driving shaft 41, one end of the driving shaft 41 is rotatably connected to the bracket assembly 10, and the other end is provided with a positioning piece 60, the trailer hook 20 is connected to the driving shaft 41 and is positioned by the positioning piece 60; specifically, the trailer hook 20 is sleeved on the outside of the driving shaft 41, and the sleeve of the trailer hook 20 is provided with a through hole, the other end of the driving shaft 41 can pass through the outside of the through hole from the inside of the through hole, and the other end of the driving shaft 41 is provided with a positioning piece 60, which can limit the trailer hook 20 from escaping from the driving shaft 41 to improve the working stability of the trailer traction device 100.

[0075] Reference Figures 1 to 3 , Figure 5 In some embodiments of the present invention, the locking assembly 30 includes a plurality of locking blocks 31, and the trailer hook 20 is provided with a plurality of locking grooves 22. The plurality of locking blocks 31 and the plurality of locking grooves 22 are arranged along the rotation direction of the trailer hook 20. The plurality of locking blocks 31 correspond to the plurality of locking grooves 22 one by one and are engaged with each other, so as to further improve the locking stability of the trailer towing device 100.

[0076] Reference Figures 1 to 8According to the vehicle of the embodiment of the present invention, the vehicle includes the trailer traction device 100 in the above embodiment. By applying the above trailer traction device 100, the automation requirements of vehicle traction can be met without affecting the vehicle styling layout.

[0077] Specifically, the trailer hook 20 can rotate between the extended position and the stored position under the drive of the drive assembly 40, and the locking assembly 30 locks and unlocks the trailer hook 20 in the extended position and locks and unlocks the trailer hook 20 in the stored position under the drive of the drive assembly 40.

[0078] The working process of the trailer towing device 100 is as follows:

[0079] When the trailer hook 20 is switched to the extended position, the drive shaft 41 rotates forward, and the drive end face gear and the driven end face gear are transmitted to drive the trailer hook 20 to rotate to the extended position. The trailer hook 20 is kept in the extended position by the cooperation between the limit member 112 and the limit groove 23. The drive shaft 41 continues to rotate forward, driving the sliding member 42 to move axially, so that the first locking surface 4211 of the sliding member 42 abuts against the driving locking block 31 and extends radially into the locking groove 22, locking the trailer hook 20 in the extended position; then, the drive shaft 41 reverses, and the active end face gear and the driven end face gear are rotated in the opposite direction. The gears of the wheels abut against each other, so that the active end face gear overcomes the elastic force of the elastic member 53 and moves away from the driven end face gear, causing the active end face gear to slip relative to the driven end face gear. During this process, the first locking surface 4211 of the sliding block releases the drive to the locking block 31 to release the lock of the trailer hook 20. At this time, under the action of the elastic member 53, the active end face gear and the driven end face gear are re-engaged in transmission, that is, the drive shaft 41 is connected to the trailer hook 20 in transmission, and the locking groove 22 moves along the rotation direction to squeeze out the locking block 31, so as to facilitate the subsequent rotation of the trailer hook 20.

[0080] When the trailer hook 20 is switched to the storage position, the drive shaft 41 reverses, and drives the trailer hook 20 to rotate to the storage position through the driving end face gear and the driven end face gear. The trailer hook 20 is kept in the storage position by the cooperation between the limit member 112 and the limit groove 23. The drive shaft 41 continues to reverse, driving the sliding member 42 to move axially, so that the second locking surface 4213 of the sliding member 42 abuts against the driving locking block 31 and extends radially into the locking groove 22, locking the trailer hook 20 in the storage position; then, the drive shaft 41 rotates forward, and the driving end face gear and the driven end face gear are rotated forward. The gears of the wheels abut against each other, so that the active end face gear overcomes the elastic force of the elastic member 53 and moves away from the driven end face gear, causing the active end face gear to slip relative to the driven end face gear. During this process, the second locking surface 4213 of the sliding block releases the drive to the locking block 31 to release the lock of the trailer hook 20. At this time, under the action of the elastic member 53, the active end face gear and the driven end face gear are re-engaged in transmission, that is, the drive shaft 41 is connected to the trailer hook 20 in transmission, and the locking groove 22 moves along the rotation direction to squeeze out the locking block 31, so as to facilitate the subsequent rotation of the trailer hook 20.

[0081] In addition, the locking block 31 has a first end 301 and a second end 302 that are radially opposite to each other. The end face of the first end 301 is configured as an arcuate surface extending along the rotation direction of the trailer hook 20 and with the middle portion convex toward the locking groove 22, and the locking groove 22 has a first guide surface 221, and the first guide surface 221 is configured as an arcuate surface extending along the rotation direction of the trailer hook 20 and with the middle portion concave in the direction away from the first matching portion 11. The end face of the first end 301 and the first guide surface 221 cooperate with each other, so that the locking block 31 in the locking groove 22 can be squeezed out when the trailer hook 20 rotates.

[0082] Furthermore, the first matching portion 11 is provided with a guide groove 113 extending in the axial direction, and the sliding member 42 is provided with a guide member 422 . The guide member 422 is slidably matched with the guide groove 113 to guide the sliding member 42 to move in the axial direction.

[0083] In addition, the trailer bar 12 extends in the left-right direction, the trailer hook 20 extends in the front-to-back direction when in the extended position, and the rotation center axis of the trailer hook 20 extends in the left-to-right direction from the front-to-back direction, so that the trailer hook 20 extends in the left-to-right direction when in the storage position, thereby improving the space utilization of the trailer towing device 100.

[0084] The present invention discloses a fully automatic trailer device (i.e., a trailer towing device 100), which is used to connect the towing vehicle body and the connecting groove of the towed vehicle to ensure that the towing requirements of medium and large SUVs are met (the front and rear towing capacity of the whole vehicle is ≥2500kg, and the upper and lower load-bearing capacity is ≥125kg). The main structure thereof includes: a trailer bar 12, a bracket 13, a drive assembly 40, a locking assembly 30 and a trailer hook 20.

[0085] Specifically, the trailer bar 12 is bolted to the longitudinal beam of the vehicle body, and the position of the assembly hole can be adjusted according to the layout of the vehicle. The first frame 131 is welded to the trailer bar 12, the second frame 132 is bolted to the trailer bar 12 and the first frame 131 respectively, the third frame is welded to the trailer bar 12, and the second frame 132 is bolted to the third frame. The trailer bar 12 can be a seamless steel pipe, or a square steel, a profile, etc., which has stronger bearing capacity, better durability, and longer service life.

[0086] More specifically, the motor (i.e., the driving member 43) drives the driving shaft 41 to rotate forward, the driving shaft 41 is provided with a shaft thread, the sliding block (i.e., the sliding member 42) is provided with a sliding block guide pin hole, which is fixedly connected with the guide pin (i.e., the guide member 422), and under the guidance of the guide pin, the shaft thread drives the sliding block to move along the driving shaft 41. The sliding block wedge surface (including the first locking surface 4211, the second locking surface 4213 and the sliding surface 4212) on the sliding block is separated from the locking block 31 wedge surface on the locking block 31, causing the sliding block to disengage from the accommodating portion of the locking block 31 (i.e., the locking groove 22), thereby achieving unlocking.

[0087] In addition, in order to prevent the trailer hook 20 from falling directly after being unlocked, a face gear is specially designed. The active face gear and the driven face gear are tightly connected together through tooth matching, and the driven face gear is fixedly connected to the trailer hook 20 through a gear fastening bolt to prevent the trailer hook 20 from falling. The drive shaft 41 is connected to the active face gear through a fixed pin, and the active face gear can move along the axis on the fixed pin. When the drive shaft 41 rotates, the trailer hook 20 is locked by the locking block 31 and cannot rotate. At this time, the compression spring of the active face gear is disengaged from the driven face gear and rotates with the drive shaft 41. After being fully unlocked, under the action of the spring, the active face gear and the driven face gear are connected together through teeth, so the trailer hook 20 rotates with the drive shaft 41. After being in place, the trailer hook 20 stops rotating under the blocking action of the positioning pin.

[0088] The drive shaft 41 continues to rotate, and the sliding block still moves along the axis of the drive shaft 41. The sliding block wedge surface begins to engage with the locking block 31 wedge surface, causing the sliding block to extend from the locking block 31 receiving portion and be fixedly connected to the locking groove 22 of the trailer hook 20, thereby achieving locking. The retraction process is the same as the extension process, and will not be repeated.

[0089] In this way, the trailer forward moving device in the embodiment of the present invention can be made more compact in structure, more flexible in movement, lighter, and can realize automatic extension and retraction, with beautiful appearance and better economy.

[0090] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “rear”, “left”, “right”, “axial”, “radial” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0091] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0092] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0095] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A trailer towing device, characterized in that: include: A support assembly (10); A trailer hook (20), the trailer hook (20) is rotatably connected to the bracket assembly (10) and has an extended position and a stored position; A locking assembly (30), the locking assembly (30) being used for switchably locking and unlocking the trailer hook (20); A driving assembly (40) drives the trailer hook (20) to rotate when the locking assembly (30) unlocks the trailer hook (20), and drives the locking assembly (30) to lock the trailer hook (20) when the trailer hook (20) is located at the extended position and the stored position.

2. The trailer towing device according to claim 1, characterized in that: One of the bracket assembly (10) and the trailer hook (20) includes a first matching portion (11), and the other includes a second matching portion (21) rotatably connected to the first matching portion (11), the first matching portion (11) is provided with a mounting hole (111) and the second matching portion (21) is provided with a locking groove (22), the locking assembly (30) includes a locking block (31), the locking block (31) is slidably arranged in the mounting hole (111), and the locking block (31) locks the trailer hook (20) when it extends into the locking groove (22), and unlocks the trailer hook (20) when it exits the locking groove (22).

3. The trailer traction device according to claim 2, characterized in that: The second matching portion (21) is configured as a sleeve rotatably connected to the outside of the first matching portion (11), the mounting hole (111) is provided on the first matching portion (11), and the locking groove (22) is provided on the inner side surface of the second matching portion (21).

4. The trailer towing device according to claim 2, characterized in that: The locking block (31) has a first end (301), and the first end (301) is slidably matched with the locking groove (22) along the rotation direction of the trailer hook (20), and the end surface of the first end (301) of the locking block (31) is set as an arcuate surface extending along the rotation direction of the trailer hook (20) and the middle part of which is convex toward the locking groove (22); and / or the locking groove (22) has a first guide surface (221), and the first guide surface (221) is set as an arcuate surface extending along the rotation direction of the trailer hook (20) and the middle part of which is concave in the direction away from the first matching portion (11).

5. The trailer towing device according to claim 1, characterized in that: The driving assembly (40) comprises: A drive shaft (41), the drive shaft (41) being rotatably connected to the support assembly (10); A sliding member (42), wherein the sliding member (42) and the driving shaft (41) are threadedly driven, the sliding member (42) is provided with a flared sliding groove (421), the sliding groove (421) has a first locking surface (4211), a second locking surface (4213) and a sliding surface (4212), the sliding surface (4212) is connected between the first locking surface (4211) and the second locking surface (4213), and the first locking surface (4211) and the second locking surface (4213) are opposite to each other along the axial direction of the driving shaft (41), Wherein, the locking assembly (30) is slidably arranged in the slide groove (421) along the axial direction, and the locking assembly (30) locks the trailer hook (20) when it abuts against the first locking surface (4211) and the second locking surface (4213), and releases the lock of the trailer hook (20) when it abuts against the sliding surface (4212).

6. The trailer towing device according to claim 5, characterized in that: The support assembly (10) is provided with a guide groove (113) extending along the axial direction; the sliding member (42) is provided with a guide member (422) slidably disposed in the guide groove (113).

7. The trailer towing device according to claim 1, characterized in that: The invention also comprises a transmission assembly (50), wherein the transmission assembly (50) comprises an active member (51) and a driven member (52), wherein the active member (51) is connected to the driving assembly (40), and the driven member (52) is connected to the trailer hook (20), wherein the active member (51) and the driven member (52) are in transmission cooperation and can be released, wherein when the trailer hook (20) is locked, the active member (51) and the driven member (52) are released from transmission, and when the trailer hook (20) is unlocked, the active member (51) and the driven member (52) are in transmission cooperation.

8. The trailer towing device according to claim 7, characterized in that: The driving assembly (40) comprises a driving shaft (41), the driving member (51) is configured as a driving end face gear, and the driven member (52) is configured as a driven end face gear, the driving end face gear is slidably disposed on the driving shaft (41) along the axial direction of the driving shaft (41) and rotates along with the driving shaft (41), and the driving end face gear is in transmission meshing engagement with the driven end face gear along the axial direction of the driving shaft (41); And / or, the transmission assembly (50) further comprises an elastic member (53), wherein the elastic member (53) is arranged on the support assembly (10) and has an elastic force for driving the active member (51) to move toward the driven member (52).

9. The trailer towing device according to claim 1, characterized in that: One of the bracket assembly (10) and the trailer hook (20) is provided with a limiting member (112), and the other is provided with a limiting groove (23), wherein the limiting groove (23) extends along the rotation direction of the trailer hook (20) and has two opposite ends, and the limiting member (112) is movably arranged in the limiting groove (23), and the limiting member (112) stops at one end of the limiting groove (23) when in the extended position, and stops at the other end of the limiting groove (23) when in the stored position; And / or, the bracket assembly (10) further comprises a trailer bar (12) and a bracket (13), wherein the bracket (13) is arranged on the trailer bar (12), the trailer hook (20) is rotatably arranged on the bracket (13), the trailer hook (20) extends in the front-to-back direction, the trailer bar (12) extends in the left-to-right direction, and the rotation center axis of the trailer hook (20) is inclined in the left-to-right direction in the direction from the front to the back; And / or, the driving assembly (40) comprises a driving shaft (41), one end of the driving shaft (41) is rotatably connected to the bracket assembly (10), and the other end is provided with a positioning member (60), and the trailer hook (20) is connected to the driving shaft (41) and is positioned by the positioning member (60); And / or, the locking assembly (30) includes a plurality of locking blocks (31), the trailer hook (20) is provided with a plurality of locking grooves (22), the plurality of locking blocks (31) and the plurality of locking grooves (22) are arranged along the rotation direction of the trailer hook (20), and the plurality of locking blocks (31) correspond to the plurality of locking grooves (22) one by one and are engaged with each other.

10. A vehicle, characterized in that: A trailer traction device comprising the trailer traction device according to any one of claims 1 to 9.

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