Trailer hitch and vehicle

Abstract

The utility model relates to vehicle towing device technical field and provide a trailer towing device and vehicle. The utility model discloses a trailer hook that is set up on the mounting support through the pivot, and the drive motor for urging the pivot rotation. The side of mounting support is equipped with locking mechanism, and the transmission mechanism that is linked with locking mechanism and pivot is arranged, transmission mechanism is linked with drive motor. The trailer hook is located the other side of mounting support, and the sealing ring is equipped on the trailer hook, and the mounting support has the sealing end face that is set up corresponding to the sealing ring, and the first sealing lip that is perpendicular with the sealing end face is equipped on the sealing ring, and the first sealing lip is in close contact on the sealing end face. The utility model can reduce the dither that the trailer hook produces because of the self weight drop to a certain extent, can promote the smoothness of trailer hook operation.

Description

Technical Field

[0001] This utility model relates to the field of vehicle towing device technology, and in particular to a trailer towing device and vehicle. Background Technology

[0002] To meet the towing needs of RVs, luggage racks, bicycle racks, and small trucks, trailer towing devices are often installed at the rear of the vehicle. Currently, trailer towing devices can be divided into three categories according to their installation method: mechanical, semi-automatic, and fully automatic. Fully automatic trailer towing devices, which can operate automatically throughout the entire process without manual operation, are increasingly favored by people.

[0003] In fully automatic trailer towing devices, the trailer hook is generally driven by a motor and equipped with a locking mechanism to lock the trailer hook in a set position (usually the retracted or extended position). However, in actual use, especially at the moment of device startup, the trailer hook is prone to shaking due to its own weight, which is detrimental to improving the smoothness of the trailer hook's operation. Utility Model Content

[0004] In view of this, the present invention aims to provide a trailer traction device to improve the smoothness of trailer hook operation.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A trailer towing device includes a trailer hook mounted on a mounting bracket via a pivot, and a drive motor for driving the pivot to rotate. The mounting bracket is provided with a locking mechanism on one side, and a transmission mechanism that is linked to the locking mechanism and the rotating shaft. The transmission mechanism is connected to the drive motor. The trailer hook is located on the other side of the mounting bracket. The trailer hook is provided with a sealing ring. The mounting bracket has a sealing end face corresponding to the sealing ring. The sealing ring is provided with a first sealing lip perpendicular to the sealing end face. The first sealing lip abuts against the sealing end face.

[0006] Furthermore, the trailer hook has an installation notch at the outer edge near the mounting bracket, and the sealing ring is installed in the installation notch; The first sealing lip of the sealing ring is pressed against the sealing end face by the first side wall of the mounting bracket within the mounting notch.

[0007] Furthermore, a groove is provided on the second sidewall of the mounting notch facing the inner circumferential surface of the sealing ring, and a protrusion is provided on the inner circumferential surface of the sealing ring that is embedded in the groove.

[0008] Furthermore, the sealing ring is provided with a second sealing lip; The second sealing lip is located outside the first sealing lip, and the second sealing lip abuts against the sealing end face.

[0009] Furthermore, along the direction pointing towards the sealing end face, the second sealing lip is inclined outward relative to the first sealing lip.

[0010] Furthermore, the locking mechanism includes a locking unit; The locking unit includes a locking device slidably disposed on the mounting bracket, a locking member disposed between the locking device and the rotating shaft, and an elastic element disposed between the locking device and the mounting bracket; The locking device, under the elastic preload of the elastic element, can press against the locking member, and the pressed locking member can lock the rotating shaft and lock the trailer hook in the retracted or extended position.

[0011] Furthermore, the locking mechanism includes an anti-mislocking unit; The locking device is driven to slide relative to the mounting bracket, thereby releasing the locking member from locking the rotating shaft and compressing the elastic element; When the locking member releases its lock on the rotating shaft, the anti-mislocking unit is triggered by the rotating shaft, which maintains the compression of the elastic element by the locking device.

[0012] Furthermore, the anti-mislocking unit includes an anti-mislocking groove on the rotating shaft, an anti-mislocking component on the mounting bracket, and a limiting hole on the locking device; The anti-mislocking component is movably disposed within the mislocking component through hole on the mounting bracket. The anti-mislocking groove is a plurality of grooves spaced apart circumferentially along the rotating shaft. When the trailer hook is in the retracted position or the extended position, the anti-mislocking component is embedded in one of the anti-mislocking grooves.

[0013] Furthermore, the transmission mechanism includes a dial, which is connected to the drive motor and can rotate under the external force output by the drive motor, and the dial is provided with a pin. The locking device is provided with an unlocking ramp, and the dial is driven by the external force. The pin can press against the unlocking ramp to push the locking device to slide along the axis of the rotating shaft.

[0014] Compared with the prior art, this utility model has the following advantages: (1) The trailer traction device of the present invention provides a sealing ring on the trailer hook, forms a sealing end face on the mounting bracket corresponding to the sealing ring, and makes the first sealing lip on the sealing ring perpendicular to the sealing end face press against the sealing end face. Thus, it can not only use the sealing ring to seal between the trailer hook and the mounting bracket, but also use the pressing of the first sealing lip to provide a damping torque, which can reduce the shaking caused by the trailer hook falling due to its own weight to a certain extent, thereby helping to improve the smoothness of the trailer hook operation.

[0015] (2) An installation notch is provided on the outer edge of the trailer hook near the mounting bracket so that the sealing ring is installed in the installation notch and the first sealing lip is pressed against the side wall of the mounting bracket through the installation notch. The structure is simple and easy to design and form. It also facilitates the installation of the sealing ring on the trailer hook and helps to better prevent mud, sand and rainwater from entering between the trailer hook and the mounting bracket, thus ensuring the sealing effect of the sealing ring.

[0016] (3) By setting a groove on the side wall of the installation notch and setting a protrusion embedded in the groove on the inner circumferential surface of the sealing ring, the sealing ring can play a certain positioning role after installation, which helps to prevent the sealing ring from coming out during assembly and also helps to ensure the tightness of the first sealing lip on the sealing end face.

[0017] (4) By setting a second sealing lip on the outside of the first sealing lip and abutting against the sealing end face, on the one hand, the damping torque brought by the sealing ring can be further increased, which helps to prevent the trailer hook from shaking. On the other hand, it can also resist the intrusion of mud and sand, reduce the intrusion speed of rainwater, reduce the impact on the first sealing lip on the inside, and can be combined with the first sealing lip to ensure the sealing effect of the sealing ring and achieve a good seal between the trailer hook and the mounting bracket.

[0018] (5) The second sealing lip is inclined outward, which can increase the contact area between the second sealing lip and the sealing end face, as well as increase the contact force between the two. It also helps to prevent the second sealing lip from deforming inward, which would lead to sealing failure, and thus helps to ensure the sealing effect of the second sealing lip.

[0019] (6) The locking unit is mainly composed of locking device, locking component and elastic element. It has a simple structure, is easy to design and manufacture, and is also conducive to locking the rotating shaft and trailer hook.

[0020] (7) By further setting an anti-mislocking unit on the basis of the locking unit, and when the locking device is driven to release the locking member from locking the shaft, i.e. the trailer hook, and at the same time compressing the elastic element, the anti-mislocking unit can maintain the compression of the elastic element by the locking device, which can avoid the situation where the locking device accidentally locks the rotating shaft, i.e. the trailer hook, due to the force applied by the elastic element to the locking device. This can avoid problems such as jamming or even sticking of the trailer traction device, and help improve the quality of use of the trailer hook.

[0021] (8) The anti-mislocking unit is mainly composed of the anti-mislocking groove on the rotating shaft, the anti-mislocking component on the mounting bracket, and the limiting hole on the locking device. The anti-mislocking unit can be set up by taking advantage of the fact that it is located between the rotating shaft, the mounting bracket and the locking device. It can make full use of the components in the locking unit to realize the setting of the anti-mislocking unit, which helps to reduce the overall space occupied by the locking mechanism and improve the integration of the mechanism.

[0022] (9) The transmission mechanism adopts a dial with a pin and an unlocking ramp on the locking device. The dial can slide and drive the locking device through the cooperation of the pin on the dial and the unlocking ramp on the locking device. The structure is simple and easy to design and implement.

[0023] This utility model also proposes a vehicle equipped with a trailer towing device as described above.

[0024] The vehicle equipped with the trailer towing device described above can achieve a seal between the trailer hook and the mounting bracket, and can also reduce the shaking caused by the trailer hook falling due to its own weight to a certain extent, which helps to improve the smoothness of the trailer hook operation, and has good practicality. Attached Figure Description

[0025] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the trailer towing device described in the embodiments of this application; Figure 2 for Figure 1 Exploded view of the trailer towing device shown; Figure 3 for Figure 2 A schematic diagram of the middle section structure from another perspective; Figure 4 This is a schematic diagram showing the sealing ring in its assembled state according to an embodiment of this application; Figure 5 This is a schematic diagram of the sealing end face described in an embodiment of this application; Figure 6This is a schematic diagram of the sealing ring described in an embodiment of this application; Figure 7 for Figure 6 A magnified view of part A in the middle; Figure 8 This is a cross-sectional view of the sealing ring described in an embodiment of this application; Figure 9 This is a schematic diagram of the installation notch described in an embodiment of this application; Figure 10 This is a schematic diagram showing the installation of the locking element and the anti-mislocking element described in the embodiments of this application on the mounting bracket; Figure 11 This is a schematic diagram of the structure of the motor bracket described in an embodiment of this application; Figure 12 This is a schematic diagram of the locking device described in the embodiments of this application; Figure 13 This is a schematic diagram of the outer disk structure described in an embodiment of this application; Figure 14 This is a schematic diagram of the inner disk structure described in an embodiment of this application; Figure 15 This is a schematic diagram of the structure of the elastic element described in the embodiments of this application when a wave spring is used; Figure 16 This is a schematic diagram of the structure of the dial described in the embodiment of this application; Figure 17 for Figure 16 A schematic diagram of the structure shown from another perspective; Figure 18 This is a schematic diagram of the structure of the rotating shaft described in the embodiment of this application; Figure 19 This is a schematic diagram of the locking device described in the embodiments of this application when the elastic element is not slidably compressed; Explanation of reference numerals in the attached figures: 1. Mounting bracket; 2. Trailer hook; 3. Drive motor; 4. Locking device; 5. Elastic element; 6. Dial; 7. Rotary shaft; 8. Locking component; 9. Anti-locking component; 10. Nut; 11. Sealing ring; 12. Protective cover; 101. First mounting boss; 1011. Guide groove; 1012. Mounting hole; 1013. Through hole for mis-locked component; 102. Second mounting boss; 103. Sealing end face; 201. Installation notch; 2011. First sidewall; 2012. Second sidewall; 2013. Groove; 301, Motor bracket; 3011, Track groove; 3011a, First groove segment; 3011b, Second groove segment; 3012, Restricting surface; 302, Bearing; 41. Outer plate; 42. Inner plate; 43. Guide pin; 44. Limit pin; 45. Limit ball; 46. Fixing pin; 401. Unlocking ramp; 402. Slide groove; 403. Locking surface; 404. Unlocking surface; 405. Guide pin hole; 406. Limit hole; 601. Pin; 602. Drive pin; 603. Slot; 71. First shaft; 72. Second shaft; 73. Third shaft; 74. Fourth shaft; 701. Locking groove; 702. Guide groove; 703. Center hole; 704. Anti-locking groove; 705. Track groove; 1101, First sealing lip; 1102, Second sealing lip; 1103, Protrusion. Detailed Implementation

[0026] To make the technical solution and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0028] Furthermore, in the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0030] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] The first aspect of this utility model provides a trailer towing device, specifically a fully automatic trailer towing device. The trailer towing device of this embodiment, through its innovative structural design, can improve the smoothness of the operation of the trailer hook 2, which helps to improve the overall quality of the device.

[0033] Among related technologies, fully automatic trailer towing devices are increasingly used because they can automate the operation of the trailer hook 2 compared to mechanical and semi-automatic trailer towing devices, freeing up personnel's hands and offering superior convenience and safety.

[0034] In fully automatic trailer towing devices, the trailer hook 2 is generally driven by a motor and locked in set positions such as retracted and extended via a locking mechanism. However, due to the lag in the transmission between the motor and the trailer hook 2, during actual use, especially at the moment of device startup, the trailer hook 2 is prone to shaking due to its own weight falling down. This is detrimental to improving the smoothness of the trailer hook 2's operation and will affect the quality of the trailer towing device.

[0035] In view of this, in order to overcome the shortcomings of the prior art, the trailer towing device in this embodiment combines... Figures 1 to 19 As shown, the overall design includes a trailer hook 2 mounted on a mounting bracket 1 via a pivot 7, and a drive motor 3 for driving the pivot 7 to rotate.

[0036] The mounting bracket 1 has a locking mechanism on one side, and a transmission mechanism that is linked to the locking mechanism and the rotating shaft 7. The transmission mechanism is connected to the drive motor 3 so as to transmit the driving force of the drive motor 3 to realize the movement of the trailer hook 2. The locking mechanism is used to lock the trailer hook 2 in a set position.

[0037] The trailer hook 2 is located on the other side of the mounting bracket 1, relative to the locking mechanism and drive motor 3. A sealing ring 11 is provided on the trailer hook 2. The mounting bracket 1 also has a sealing end face 103 corresponding to the sealing ring 11. A first sealing lip 1101 perpendicular to the sealing end face 103 is provided on the sealing ring 11. The first sealing lip 1101 abuts against the sealing end face 103.

[0038] Therefore, by setting a sealing ring 11 on the trailer hook 2, forming a sealing end face 103 corresponding to the sealing ring 11 on the mounting bracket 1, and making the first sealing lip 1101 on the sealing ring 11 perpendicular to the sealing end face 103 press against the sealing end face 103, this embodiment can use the sealing ring 11 to achieve a seal between the trailer hook 2 and the mounting bracket 1. At the same time, the pressing of the first sealing lip 1101 can provide a damping torque, which can reduce the shaking caused by the trailer hook 2 falling due to its own weight to a certain extent, thereby improving the smoothness of the operation of the trailer hook 2.

[0039] Based on the above overview, the specific arrangement of the trailer hook 2 on the mounting bracket 1 via the pivot 7 will be described in detail below. Furthermore, it is worth noting that the mounting bracket 1 serves as the foundation for the entire trailer towing device. Besides providing a mounting base for the locking mechanism, drive motor 3, and other components within the entire trailer towing device, the mounting bracket 1 also connects to the vehicle body or frame structure to enable the trailer towing device to be installed on the vehicle.

[0040] In practical implementation, the connection method between the aforementioned mounting bracket 1 and the vehicle body or frame structure can refer to existing conventional vehicle body connection methods. Furthermore, to ensure the reliability of the trailer towing device installed in the vehicle and to provide sufficient traction strength for the trailer hitch 2, the mounting bracket 1 should generally also be connected to the main frame structure of the vehicle body (such as the frame or main longitudinal beams). As an example, when the trailer towing device is installed on the vehicle, a mounting beam can be installed at the rear of the vehicle, connecting to the left and right main longitudinal beams or frame longitudinal beams, and the mounting bracket 1 is fixedly connected to this mounting beam.

[0041] In this embodiment, we continue to combine Figures 3 to 9 As shown, in some exemplary embodiments, a mounting notch 201 may be provided, for example, at the outer edge of the trailer hitch 2 near the mounting bracket 1, and the sealing ring 11 is installed in the mounting notch 201. Furthermore, after the trailer hitch 2 is installed onto the mounting bracket 1, the first sealing lip 1101 of the sealing ring 11 is pressed against the sealing end face 103 through the mounting notch 201 facing the first sidewall 2011 of the mounting bracket 1.

[0042] At this time, by setting an installation notch 201 on the outer edge of the trailer hook 2 near the mounting bracket 1, the sealing ring 11 is installed in the installation notch 201, and the first sealing lip 1101 is pressed against the side wall of the mounting bracket 1 through the installation notch 201. It has the characteristics of simple structure and easy design and molding. Compared with the case where the sealing ring 11 is close to the radial inner side of the trailer hook 2, it is also convenient to install the sealing ring 11 on the trailer hook 2, and it is beneficial to better prevent mud, sand and rainwater from entering between the trailer hook 2 and the mounting bracket 1, so as to ensure the sealing effect of the sealing ring 11.

[0043] Continue as Figure 8 and Figure 9 As shown, in some exemplary embodiments, this embodiment may, for example, provide a groove 2013 on the second sidewall 2012 facing the inner circumferential surface of the sealing ring 11 at the mounting notch 201, and correspondingly, provide a protrusion 1103 embedded in the groove 2013 on the inner circumferential surface of the sealing ring 11.

[0044] Thus, by providing a groove 2013 on the side wall of the mounting notch 201 and a protrusion 1103 embedded in the groove 2013 on the inner circumferential surface of the sealing ring 11, this embodiment can play a certain positioning role for the sealing ring 11 after installation, which helps to prevent the sealing ring 11 from coming off during assembly. Of course, by utilizing the above positioning role, it is also beneficial to ensure the tightness of the first sealing lip 1101 on the sealing end face 103.

[0045] In this embodiment, in some exemplary implementations, in addition to the first sealing lip 1101, combined with Figure 4 , Figure 7 and Figure 8 As shown, a second sealing lip 1102 can also be provided on the sealing ring 11. The second sealing lip 1102 is located outside the first sealing lip 1101, and the second sealing lip 1102 also abuts against the sealing end face 103.

[0046] It is understandable that by providing a second sealing lip 1102 that also abuts against the sealing end face 103 on the outside of the first sealing lip 1101, this embodiment can, on the one hand, further increase the damping torque brought by the sealing ring 11, which is beneficial to avoid the trailer hook 2 from shaking. On the other hand, this embodiment can also resist the intrusion of mud and sand, reduce the intrusion speed of rainwater, and reduce the impact on the inner first sealing lip 1101. Thus, it can combine with the first sealing lip 1101 to ensure the sealing effect of the sealing ring 11, which helps to achieve a good seal between the trailer hook 2 and the mounting bracket 1.

[0047] Still by Figure 4 and Figure 8As shown, in this embodiment, based on the provision of a second sealing lip 1102, in some exemplary embodiments, the second sealing lip 1102 may be configured to be inclined outward relative to the first sealing lip 1101 in the direction pointing towards the sealing end face 103.

[0048] At this time, the second sealing lip 1102 is inclined outward, which obviously helps to increase the contact area between the second sealing lip 1102 and the sealing end face 103, as well as increase the contact force between the two. At the same time, it also helps to prevent the second sealing lip 1102 from deforming inward, which would lead to sealing failure, and thus helps to ensure the sealing effect of the second sealing lip 1102.

[0049] In this embodiment, it is worth noting that, in specific implementation, the sealing ring 11 can be made of a rubber sealing structure with good weather resistance and durability. In order to increase the stability of the sealing ring 11 on the trailer hook 2, especially to increase the clamping force between the lip structure on the sealing ring 11 and the sealing end face 103 on the mounting bracket 1, for example, in some exemplary embodiments, a skeleton made of elastic steel can be embedded inside the sealing ring 11.

[0050] In this embodiment, by Figure 1 and Figure 2 and continue as Figures 10 to 19 As shown, the locking mechanism includes a locking unit. Furthermore, in some exemplary embodiments, the locking unit includes a locking device 4 slidably disposed on the mounting bracket 1, a locking element 8 disposed between the locking device 4 and the pivot 7 of the trailer hitch 2, and an elastic element 5 disposed between the locking device 4 and the mounting bracket 1.

[0051] Specifically, the locking device 4 can slide along the axial direction of the rotating shaft 7 on the mounting bracket 1. Under the elastic preload of the elastic element 5, the locking device 4 can press against the locking member 8, and the pressed locking member 8 can lock the rotating shaft 7 and lock the trailer hook 2 in the retracted or extended position.

[0052] In detail, as a structural example of the mounting bracket 1 in this embodiment, it may be plate-shaped as a whole, with a first mounting boss 101 and a second mounting boss 102 respectively provided on two opposite sides. The first mounting boss 101 and the second mounting boss 102 are arranged opposite to each other on both sides of the mounting bracket 1, and the mounting bracket 1 is also provided with a through hole that passes through both the first mounting boss 101 and the second mounting boss 102. The rotating shaft 7 is rotatably installed in the through hole, thereby realizing the rotational setting of the rotating shaft 7 on the mounting bracket 1.

[0053] It is worth noting that, in addition to forming a through hole for rotating the shaft 7, the first mounting boss 101 is also used to set the locking mechanism of this embodiment, and the second mounting boss 102 is used to rotate and support the trailer hook 2, so that while realizing the rotatable mounting of the trailer hook 2 on the mounting bracket 1, the transmission connection between the trailer hook 2 and the shaft 7 is also realized.

[0054] In this embodiment, based on the setting of the first mounting boss 101 in the mounting bracket 1, the locking device 4 is slidably disposed on the first mounting boss 101, and the locking device 4 is driven to slide along the axial direction of the rotating shaft 7, that is, the locking device 4 slides on the first mounting boss 101.

[0055] Furthermore, to prevent the locking device 4 from rotating relative to the first mounting boss 101, a guide groove 1011 can be provided on the outer peripheral wall of the first mounting boss 101, and a corresponding guide pin 43 can be provided on the locking device 4. The guide pin 43 is pressed into the guide pin hole 405 on the locking device 4. When the locking device 4 is mounted on the first mounting boss 101, the guide pin 43 slides in the guide groove 1011, thereby constraining the locking device 4 to be able to slide axially relative to the mounting bracket 1.

[0056] Continue to combine Figure 10 , Figure 12 and Figure 18 As shown, based on the same configuration of the first mounting boss 101, in some exemplary embodiments of this embodiment, the locking member 8 is movably disposed in the mounting hole 1012 on the first mounting boss 101. Meanwhile, a locking groove 701 is provided on the rotating shaft 7, and a locking surface 403 and an unlocking surface 404 are also provided on the locking device 4.

[0057] Among them, combined Figure 12 As shown, the locking grooves 701 are specifically arranged in multiple circumferentially along the rotating shaft 7. The locking surface 403 and the unlocking surface 404 are arranged along the axial direction of the locking device 4. In terms of design, as the locking device 4 slides to different positions on the first mounting boss 101, when the locking member 8 is pressed between the locking surface 403 and the locking groove 701, it can lock the rotating shaft 7, i.e., the trailer hook 2. When the locking member 8 is located between the unlocking surface 404 and the locking groove 701, it can release the locking of the rotating shaft 7, i.e., the trailer hook 2.

[0058] Specifically, both the locking surface 403 and the unlocking surface 404 are located on the inner wall of the locking device 4. From the radial cross-section of the locking device 4, the recess depth of the unlocking surface 404 towards the outer peripheral wall of the locking device 4 is much greater than that of the locking surface 403. Thus, compared to the locking surface 403, the unlocking surface 404 on the locking device 4 can form a "accommodating space" that can accommodate the locking member 8. When the locking member 8 is located between the unlocking surface 404 and the locking groove 701, the "accommodating space" formed above can accommodate the locking member 8, allowing the locking member 8 to move radially away from the locking groove 701 on the rotating shaft 7, thereby unlocking the rotating shaft 701, i.e., the trailer hook 2.

[0059] Of course, as the locking device 4 slides axially, when the locking member 8 enters between the locking surface 403 and the locking groove 701, the locking surface 403 will squeeze the locking member 8 due to the disappearance of the "accommodating space", and finally press the locking member 8 against the locking surface 403 and the locking groove 701. At this time, by using the insertion of the locking member 8 in the locking groove 701, the locking of the rotating shaft 7, that is, the trailer hook 2, can be formed.

[0060] It is understandable that by using the locking groove 701 on the rotating shaft 7, and the locking surface 403 and unlocking surface 404 on the locking device 4 to cooperate with the locking member 8, and based on the axial sliding of the locking device 4, the rotating shaft 7, i.e. the trailer hook 2, can be locked or unlocked. It has the advantages of simple structure and easy design and implementation. At the same time, since they are all purely mechanical structures, they also have the advantages of structural stability and good durability.

[0061] It is worth noting that specific examples of the axial sliding drive form of the locking device 4 can be found in the description of the relevant embodiments below. In addition, since there are multiple locking grooves 701 arranged at intervals on the rotating shaft 7, in the design, preferably, in specific implementation, the mounting holes 1012 can also be multiple that are distributed at intervals along the circumference of the first mounting boss 101, and a locking element 8 is provided in each mounting hole 1012.

[0062] In the extended position of the trailer hook 2, each locking member 8 is embedded in its corresponding locking groove 701. Similarly, in the retracted position of the trailer hook 2, each locking member 8 is also embedded in its corresponding locking groove 701 to lock the trailer hook 2 when it is extended or retracted.

[0063] In this embodiment, in some exemplary implementations, the locking member 8 may be a locking ball disposed in the mounting hole 1012, thus ensuring the smooth movement of the locking member 8. However, in addition to the preferred use of a locking ball, in specific implementations, the locking member 8 may also adopt a structure such as a pin, as long as the design requirements of the locking member 8 are met.

[0064] In this embodiment, it is worth noting that, since the locking grooves 701 are multiple and spaced apart on the rotating shaft 7, when the locking device 4 is driven to slide axially, compress the elastic element 5, and the locking member 8 is unlocked, the unlocked rotating shaft 7 is driven to rotate the trailer hook 2. Obviously, since the elastic element 5 has a force pointing towards the locking device 4, and generally no longer applies a driving force when the unlocking sliding stroke of the locking device 4 is in place, if the position of the locking device 4 is not restricted at this time, it is easy for the elastic element 7 to drive the locking device 4 to slide back to its original position. During the rotation of the rotating shaft 7, the locking member 8 is pressed into the locking groove 701 that is passing through by the locking device 4, causing the trailer hook 2 to be mistakenly locked before reaching the unfolded or retracted position.

[0065] Based on this, the locking mechanism in this embodiment is further provided with an anti-mislocking unit. At this time, the locking device 4 is driven to slide along the mounting bracket 1, which can release the locking member 8 from locking the rotating shaft 7 and compress the elastic element 5. The aforementioned anti-mislocking unit is used to maintain the compression of the elastic element 5 by the locking device 4 when the locking member 8 is released from locking the rotating shaft 7.

[0066] Thus, by further setting the aforementioned anti-mislocking unit on the basis of the locking unit, and when the locking device 4 is driven to release the locking member 8 from locking the rotating shaft 7, i.e. the trailer hook 2, and simultaneously compress the elastic element 5, the anti-mislocking unit can maintain the compression of the elastic element 5 by the locking device 4. In this embodiment, it can avoid the situation where the locking device 4 mistakenly locks the rotating shaft 7, i.e. the trailer hook 2, due to the force exerted by the elastic element 5 on the locking device 4 after the locking device 4 is unlocked and the rotating shaft 7 rotates, thereby achieving the effect of avoiding jamming and sticking of the trailer towing device.

[0067] It is worth noting that the anti-mislocking unit in this embodiment maintains the compression of the elastic element 5 by the locking device 4 at the end of the unlocking sliding stroke of the locking device 4, thereby preventing the locking device 4 from sliding back due to the force of the elastic element 5 and causing the locking member 8 to be mislocked.

[0068] In a specific implementation, as an example, the anti-mislocking unit can be disposed between the rotating shaft 7, the mounting bracket 1, and the locking device 4. When the locking device 4 releases the locking member 8 from locking the rotating shaft 7, the anti-mislocking unit is triggered by the rotating shaft 7 to maintain the compression of the elastic element 5 by the locking device 4.

[0069] Thus, by placing the anti-mislocking unit between the rotating shaft 7, the mounting bracket 1, and the locking device 4, and triggering the anti-mislocking unit to work by rotating the rotating shaft 7, it can be understood that it can make full use of the components in the locking unit to realize the setting of the anti-mislocking unit, which helps to reduce the overall space occupied by the locking mechanism and improve the integration of the mechanism.

[0070] In terms of specific structure, as an example, let's continue to combine... Figures 10 to 19 As shown, the anti-mislocking unit of this embodiment may include, for example, an anti-mislocking groove 704 provided on the rotating shaft 7, an anti-mislocking component 9 provided on the mounting bracket 1, and a limiting hole 406 provided on the locking device 4.

[0071] Among them, the anti-mislocking component 9 is movably installed in the mislocking component through hole 1013 on the first mounting boss 101 in the mounting bracket 1, and the anti-mislocking groove 704 is also a plurality of them arranged circumferentially along the rotating shaft 7, and when the trailer hook 2 is in the retracted position or the extended position, the anti-mislocking component 9 is embedded in one of the anti-mislocking grooves 704.

[0072] At the same time, when the locking device 4 releases the lock on the rotating shaft 7, the aforementioned limiting hole 406 can be aligned with the mis-locking component through hole 1013 as the locking device 4 slides. When the unlocked rotating shaft 7 rotates, the anti-mis-locking component 9 bears the force of the rotating shaft 7 and can be inserted into the limiting hole 406 to lock the position of the locking device 4.

[0073] It is understandable that the anti-mislocking groove 704 on the rotating shaft 7 and the limiting hole 406 on the locking device 4 cooperate with the anti-mislocking component 9. When the locking device 4 slides to the unlocking position, that is, the end of its unlocking sliding stroke, the rotation of the rotating shaft 7 causes the anti-mislocking component 9 to be inserted into the limiting hole 406, so as to lock the position of the locking device 4. It also has the characteristics of simple structure and easy implementation. Of course, since it is a purely mechanical mechanism, it also has the advantage of good durability.

[0074] It is worth noting that while multiple anti-mislocking grooves 704 are provided on the rotating shaft 7, in order to ensure the locking effect of the anti-mislocking component 9 on the locking device 4, the aforementioned anti-mislocking component 9 can preferably be multiple components arranged at intervals along the circumference of the first mounting boss 101. Simultaneously, multiple limiting holes 406 are also provided on the locking device 4. Furthermore, when the trailer hook 2 is in the retracted or extended position, each anti-mislocking component 9 can be correspondingly inserted into an anti-mislocking groove 704. When the rotating shaft 7 is driven to rotate, each anti-mislocking component 9, under the force of the rotating shaft 7, can be inserted into its corresponding limiting hole 406 to jointly lock the locking device 4.

[0075] In this embodiment, similar to the locking member 8 described above, in some exemplary implementations, the anti-mislocking member 9 may also be an anti-mislocking ball disposed within the through hole 1013 of the mislocking member. Thus, using an anti-mislocking ball for the anti-mislocking member 9 also ensures the smooth movement of the anti-mislocking member 9. Of course, besides using an anti-mislocking ball, the anti-mislocking member 9 may also employ other structures that meet the design requirements, such as a pin.

[0076] In addition, in some exemplary embodiments, an anti-disengagement protrusion may be provided at the end of the mis-locking component through hole 1013 away from the rotating shaft 7. This anti-disengagement protrusion is used to prevent the anti-mis-locking component 9 from disengaging from the mis-locking component through hole 1013.

[0077] In specific implementation, the above-mentioned anti-disengagement protrusion can be formed around the edge of the end of the through hole 1013 of the mis-locking component. Furthermore, by setting the above-mentioned anti-disengagement protrusion, combined with... Figure 13 As shown, it can be understood that the anti-disengagement flange can effectively prevent the anti-disengagement component 9 from disengaging from the anti-disengagement component through hole 1013 when the locking device 4 is in the position of not sliding and compressing the elastic element 5 and the mis-locking component through hole 1013 is exposed, thus helping to ensure the stability of the anti-disengagement unit structure.

[0078] In this embodiment, in some exemplary implementations, the elastic element 5 is preferably, for example, a wave spring disposed between the locking device 4 and the mounting bracket 1.

[0079] The structure of a wave spring can be as follows: Figure 15 As shown, it is specifically mounted on the first mounting boss 101 in the mounting bracket 1. It can be understood that by using a wave spring for the elastic element 5, it has the advantages of small space occupation and reliable elastic force, which can facilitate the realization of the locking mechanism and the compact design of the trailer traction device using the locking mechanism.

[0080] In this embodiment, the aforementioned transmission mechanism is used to receive the driving force of the drive motor 3, enabling control of the locking mechanism and the rotating shaft 7. Furthermore, the transmission mechanism is designed to operate in both the unlocking and driving strokes under the drive of the drive motor 3. During the unlocking stroke, the transmission mechanism drives the locking device 4 in the locking mechanism to slide axially along the rotating shaft 7, thereby releasing the locking member 8 from locking the rotating shaft 7 and compressing the elastic element 5. During the driving stroke, the transmission mechanism drives the trailer hook 2 to rotate via the unlocked rotating shaft 7, allowing the trailer hook 2 to switch between a retracted position and an extended position.

[0081] Specifically, for the drive motor 3 in this embodiment, it can be fixed to the mounting bracket 1 by means of the motor bracket 301.

[0082] Furthermore, in specific implementations, in some of the exemplary implementations, the following continues... Figure 16 and Figure 17 As shown, the aforementioned transmission mechanism may include, for example, a dial 6, which is connected to the drive motor 3 and can rotate under the external force output by the drive motor 3. A pin 601 is also provided on the dial 6.

[0083] Corresponding to the dial 6 and the pin 601 thereon, in this embodiment, an unlocking ramp 401 is provided on the locking device 4, and the dial 6 is driven by the external force output by the drive motor 3, so that the pin 601 can press against the unlocking ramp 401 to push the locking device 4 to slide along the axis of the rotating shaft 7.

[0084] At this point, it can be understood that the sliding drive of the dial 6 to the locking device 4 is achieved by the cooperation between the dial pin 601 on the dial 6 and the unlocking ramp 401 on the locking device 4. This has the advantages of simple structure and easy design and implementation.

[0085] In specific implementations, it is worth noting that, as some exemplary embodiments, the dial 6 can be rotatably mounted on the motor bracket 301 via the bearing 302. A slot 603 is also provided on one side of the dial 6. The power output end of the drive motor 3 can be matched with the shape and size of the slot 603, thereby embedding the power output end of the drive motor 3 into the slot 603, realizing the transmission connection between the drive motor 3 and the slot 6, so that the drive motor 3 can drive the dial 6 to rotate.

[0086] The pins 601 on the dial 6 are arranged radially along the dial 6, and multiple pins 601 are spaced apart on the dial 6. Correspondingly, the unlocking ramps 401 on the locking device 4 are also multiple. It should be noted that the unlocking ramps 401 on the locking device 4 are divided into two groups with opposite directions. In this way, by utilizing the sliding engagement of the pins 601 with the unlocking ramps 401 in different directions, the dial 6 can be slidably driven on the locking device 4 when the drive motor 3 rotates forward and in reverse. Of course, the forward and reverse rotation of the drive motor 3 here corresponds to the unfolding and retraction of the trailer hook 2, respectively.

[0087] In this embodiment, as an exemplary implementation, please refer to... Figures 12 to 14 As shown, the locking device 4 specifically includes an outer disk 41 and an inner disk 42 nested together. The outer disk 41 and the inner disk 42 can only rotate relative to each other, and the unlocking inclined surface 401 is located on the outer disk 41, while the locking surface 403 and the unlocking surface 404 are located on the inner disk 42. This allows the inner disk 42 to press against the locking member 8 to lock the rotating shaft 7. At the same time, the guide pin 43 is also located on the inner disk 42 to constrain the locking device 4 as a whole so that it can slide relative to the mounting bracket 1.

[0088] It is understandable that the locking device 4 is composed of nested inner and outer disks. By setting unlocking ramps 401, locking surfaces 403 and unlocking surfaces 404 on the outer disk 41 and inner disk 42 respectively, the manufacturing of the locking device 4 can be facilitated. At the same time, the design that the inner disk 42 and outer disk 41 can only rotate relative to each other is not only conducive to realizing the locking and unlocking functions of the locking device 4, but also conducive to realizing the rotation drive of the trailer hook 2 when the rotating shaft 7 is unlocked.

[0089] It is worth noting that the outer disk 41 and the inner disk 42 can only rotate relative to each other. That is, they are designed to rotate relative to each other but cannot slide axially. To achieve this, the outer disk 41 can only rotate relative to the inner disk 42. Specifically, for example, a groove 402 can be provided on the inner wall of the outer disk 41, and a limiting ball 45 protruding radially outward along the inner disk 42 can be provided on the inner disk 42. Multiple limiting balls 45 are arranged at intervals along the circumference of the inner disk 42, and each limiting ball 45 is embedded in the groove 402. Thus, by utilizing the cooperation between the limiting balls 45 and the groove 402, the outer disk 41 and the inner disk 42 are constrained to only rotate relative to each other.

[0090] In practical implementation, to achieve the placement of the limiting ball 45 on the inner disk 42, for example, two perpendicularly intersecting process holes can be provided on the inner disk 42. One process hole penetrates the inner disk 42 radially, while the other process hole is arranged axially along the inner disk 42 and intersects with the radially arranged process hole. When the inner disk 42 is nested into the outer disk 41, the limiting ball 45 is first filled into the radially arranged process hole, and then the fixing pin 46 is pressed into the axially arranged process hole, so that the fixing pin 46 forms a support for the limiting ball 45. This allows the limiting ball 45 to be placed on the inner disk 42 while also achieving the fitting between the limiting ball 45 and the slide groove 402.

[0091] Based on the outer disk 41 and the inner disk 42, it should also be noted that the limiting hole 406 in the locking mechanism is also provided on the inner disk 42. In specific implementation, the limiting hole 406 can radially penetrate the inner disk 42 to facilitate its forming. In addition, the guide pin hole 405 is also provided on the inner disk 42 and is also radially penetrated through the inner disk 42 to facilitate the arrangement of the guide pin 43.

[0092] In addition, a limit pin 44 is provided on the outer plate 41, and correspondingly, a track groove 3011 is provided on the motor frame 301. After the trailer traction device of this embodiment is assembled, the limit pin 44 is located in the track groove 3011, and in terms of design, the track groove 3011 also has a first groove segment 3011a and a second groove segment 3011b connected together.

[0093] The first groove segment 3011a is arranged along the axial direction of the motor frame 301, while the second groove segment 3011b is arranged along the circumferential direction of the motor frame 301, thus making the track groove 3011 as a whole "L" shape. At the same time, the side wall of the first groove segment 3011a near the second groove segment 3011b also forms a limiting surface 3012.

[0094] In specific implementation, through the setting of the first groove segment 3011a and the second groove segment 3011b in the track groove 3011, it can be understood that when the drive motor 3 drives the locking device 4 to rotate via the dial 6, the limiting pin 44 slides along the limiting surface 3012 in the first groove segment 3011a. Through the cooperation of the dial 601 and the unlocking inclined surface 401, the dial 6 can slide and drive the locking device 4, so that the locking device 4 switches from the position of pressing and locking the locking member 8 to the unlocking position of unlocking the locking member 8 and compressing the elastic element 5.

[0095] When the locking device 4 reaches the unlocked position, the limiting pin 44 just enters the second groove 3011b. Since the second groove 3011b is arranged circumferentially along the motor frame 301, and the outer disk 41 in the locking device 4 can also rotate relative to the inner disk 42, the dial 6 can continue to drive the rotating shaft 7 to rotate under the drive of the drive motor 3, so as to realize the rotation drive of the trailer hook 2 after the rotating shaft 7 is unlocked.

[0096] It is worth noting that in this embodiment, corresponding to the unfolding and retraction of the trailer hook 2, that is, corresponding to the forward and reverse rotation of the drive motor 3, there are two first slot segments 3011a in the track groove 3011 on the motor frame 301. The two first slot segments 3011a are generally arranged symmetrically, and one of the first slot segments 3011a is connected to one end of the second slot segment 3011b, and the other first slot segment 3011a is connected to the other end of the second slot segment 3011b. This makes the track groove 3011 have a U-shaped structure with the opening facing the drive motor 3 when viewed radially from the motor frame 301. In this way, during the unfolding and retraction of the trailer hook 2, the limiting pin 44 located in the track groove 3011 switches positions between the two first slot segments 3011a via the second slot segment 3011b.

[0097] In this embodiment, for the rotating shaft 7, the following continues to be combined Figure 18 As shown, structurally, it may include a first shaft 71, a second shaft 72, a third shaft 73, and a fourth shaft 74 connected in sequence. Along the axial direction of the rotating shaft 7, the diameter of the first shaft 71 to the fourth shaft 74 decreases sequentially, thus enabling the rotating shaft 7 to be installed as a whole on the mounting bracket 1.

[0098] The aforementioned locking groove 701 and anti-mislocking groove 704 are located on the first shaft 71. To facilitate the sliding of the locking member 8 between the locking grooves 701, a guide groove 702 connecting the locking grooves 701 can also be provided on the outer peripheral wall of the first shaft 71. Additionally, a central hole 703 and two track grooves 705 are provided at the end of the first shaft 71. The central hole 703 allows the insertion of a pin structure located at the radial center of the dial 6 to center the dial 6. Both track grooves 705 are arc-shaped grooves arranged around the central hole 703, and the drive pins 602 on the dial 6 are respectively inserted into the two track grooves 705. Thus, through the contact between the drive pin 602 and the groove wall of the track groove 705, the dial 6 drives the rotating shaft 7 to rotate under the drive of the drive motor 3.

[0099] The second shaft 72 is mainly used to rotatably mount the rotating shaft 7 onto the mounting bracket 1. The radial cross-section of the third shaft 73 is polygonal. This polygonal design allows the trailer hook 2 to form a transmission connection when it is fitted onto the rotating shaft 7, enabling the rotating shaft 7 to drive the trailer hook 2 to rotate. The outer peripheral wall of the fourth shaft 74 is generally provided with external threads. After the trailer hook 2 is rotatably mounted onto the second mounting boss 102 in the mounting bracket 1 and is connected to the third shaft 73 in the rotating shaft 7, it is combined with… Figure 3 and Figure 4 As shown, the nut 10 can be screwed onto the fourth shaft 74 to achieve a secure connection between the trailer hook 2 and the shaft 7.

[0100] Of course, after the nut 10 is screwed onto the rotating shaft 7, the tightened nut 10 generates a tightening torque, which in turn causes the trailer hook 2 to generate an axial force, thereby driving the sealing ring 11 so that its lip abuts against the sealing end face 103 in the mounting bracket 1. Moreover, in specific implementations, after the nut 10 is connected, a protective cover 12 can usually be further installed on the nut 10 to protect the connecting threads on the fourth shaft 74 and prevent problems such as rust on the nut 10.

[0101] In this embodiment, when the trailer towing device is in operation, the drive motor 3 rotates in the forward direction. Taking the unfolding of the trailer hook 2 as an example, the drive motor 3 drives the dial 6 to rotate in the forward direction, causing the pin 601 on the dial 6 to engage with the unlocking ramp 401 on one side of the locking device 4. Since the limiting pin 44 is located in the first groove segment 3011a at one end of the track groove 3011, the drive motor 3 continues to drive the dial 6 to rotate. Based on the restriction of the limiting surface 3012 in the first groove segment 3011a, the pin 601 on the dial 6 slides along the unlocking ramp 401 on the locking device 4, so that the locking device 4 is pushed and slid along the axial direction of the rotating shaft 7 by the dial 6.

[0102] The locking device 4 is pushed by the dial 6 to slide towards the mounting bracket 1, and at the same time, the elastic element 5 is compressed, causing the locking member 8 to retract into the "accommodating space" formed by the unlocking surface 404, thereby unlocking the rotating shaft 7, i.e., the trailer hook 2. Moreover, during the unlocking process, the drive pin 602 on the dial 6 travels a free stroke in the track groove 705 at the end of the rotating shaft 7. After unlocking, the drive pin 602 engages with the groove wall of the track groove 705, which can drive the rotating shaft 7 to rotate. Under the further drive of the drive motor 3, the trailer hook 2 can be rotated and unfolded via the transmission of the dial 6 and the rotating shaft 7.

[0103] When the dial 6 drives the rotating shaft 7 to rotate, the dial 6 also continues to drive the outer disk 41 in the locking device 4 to rotate. Since the limiting pin 44 has entered the second groove segment 3011b in the track groove 3011, it will not affect the rotation of the dial 6. At the same time, when the locking device 4 slides to the mounting bracket 1, the limiting hole 406 in the locking mechanism is aligned with the anti-mislocking through hole 1013. Under the force generated by the rotation of the rotating shaft 7, the anti-mislocking component 9 disengages from the anti-mislocking groove 704 and embeds into the limiting hole 406, which also locks the axial position of the locking device 4. This keeps the elastic element 5 in a compressed state and prevents the locking component 8 from being mislocked due to the elastic element 5 pushing the locking device 4 back to its original position during the rotation of the rotating shaft 7.

[0104] Under the continuous drive of the drive motor 3, when the trailer hook 2 rotates to the position, the anti-locking through hole 1013 is re-aligned with the anti-locking groove 704 on the rotating shaft 7, so that the anti-locking component 9 in the anti-locking through hole 1013 can be inserted into the anti-locking groove 704 to release the locking device 4. At the same time, the limiting pin 44 on the locking device 4 also moves to the first groove segment 3011a located at the other end of the track groove 3011, so that the track groove 3011 will not restrict the axial movement of the locking device 4.

[0105] In this way, the locking device 4 slides back axially under the elastic return force of the elastic element 5. As the locking device 4 slides back, the locking surface 403 on the locking device 4 also pushes the locking member 8 into the locking groove 701, so as to re-lock the rotating shaft 7, i.e., the trailer hook 2. Finally, the drive motor 3 can be reversed appropriately, so that the drive pin 602 on the dial 6 rotates back to the middle position in the track groove 705, and the dial pin 601 on the dial 6 no longer abuts against the unlocking ramp 401 on the locking device 4.

[0106] Of course, when the trailer towing device is working, the sealing ring 11 on the trailer hook 2 is firmly pressed against the mounting bracket 1, preventing the trailer hook 2 from shaking due to its own weight falling off at the moment of startup. Furthermore, it is understandable that using a lighter material (such as aluminum alloy) for the trailer hook 2 will provide better anti-shake performance. In addition, as the device is used for a longer period, the sealing ring 11 should be replaced in a timely manner to avoid affecting its sealing and pressing effect due to wear.

[0107] The trailer towing device of this embodiment adopts the above design. It can use the sealing ring 11 to seal the trailer hook 2 and the mounting bracket 1. It can also use the sealing ring 11 to provide damping torque, which reduces the shaking caused by the trailer hook 2 falling due to its own weight to a certain extent, and helps to improve the smoothness of the operation of the trailer hook 2. At the same time, it can also avoid the situation where the locking device 4 accidentally locks the rotating shaft 7, i.e. the trailer hook 2, due to the force applied by the elastic element 5 to the locking device 4. This helps to avoid problems such as jamming or even sticking of the trailer towing device, and is conducive to improving the overall quality of use of the device.

[0108] A second aspect of this utility model provides a vehicle equipped with a trailer towing device as described in the first aspect embodiment above.

[0109] By setting the trailer towing device as described above, the vehicle in this embodiment can achieve a seal between the trailer hook 2 and the mounting bracket 1, which can reduce the shaking caused by the trailer hook 2 falling due to its own weight to a certain extent, which helps to improve the smoothness of the operation of the trailer hook 2. At the same time, it can also prevent the trailer hook 2 from locking accidentally, which helps to prevent the trailer towing device from jamming or even sticking, which is conducive to improving the quality of use of the device and has good practicality.

[0110] The above descriptions are merely some embodiments of this utility model and are not intended to limit the utility model. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A trailer towing device, comprising a trailer hook (2) mounted on a mounting bracket (1) via a rotating shaft (7), and a drive motor (3) for driving the rotating shaft (7) to rotate, characterized in that: The mounting bracket (1) is provided with a locking mechanism on one side, and a transmission mechanism that is linked with the locking mechanism and the rotating shaft (7). The transmission mechanism is connected to the drive motor (3). The trailer hook (2) is located on the other side of the mounting bracket (1). The trailer hook (2) is provided with a sealing ring (11). The mounting bracket (1) has a sealing end face (103) corresponding to the sealing ring (11). The sealing ring (11) is provided with a first sealing lip (1101) perpendicular to the sealing end face (103). The first sealing lip (1101) abuts against the sealing end face (103).

2. The trailer towing device according to claim 1, characterized in that: The trailer hook (2) has an installation notch (201) at the outer edge of one end near the mounting bracket (1), and the sealing ring (11) is installed in the installation notch (201); The first sealing lip (1101) in the sealing ring (11) is pressed against the sealing end face (103) by the first side wall (2011) of the mounting bracket (1) in the mounting notch (201).

3. The trailer towing device according to claim 2, characterized in that: The second sidewall (2012) of the mounting notch (201) facing the inner circumferential surface of the sealing ring (11) is provided with a groove (2013), and the inner circumferential surface of the sealing ring (11) is provided with a protrusion (1103) embedded in the groove (2013).

4. The trailer towing device according to claim 1, characterized in that: The sealing ring (11) is provided with a second sealing lip (1102). The second sealing lip (1102) is located outside the first sealing lip (1101), and the second sealing lip (1102) abuts against the sealing end face (103).

5. The trailer towing device according to claim 4, characterized in that: Along the direction pointing to the sealing end face (103), the second sealing lip (1102) is inclined outward relative to the first sealing lip (1101).

6. The trailer towing device according to any one of claims 1 to 5, characterized in that: The locking mechanism includes a locking unit; The locking unit includes a locking device (4) slidably disposed on the mounting bracket (1), a locking member (8) disposed between the locking device (4) and the rotating shaft (7), and an elastic element (5) disposed between the locking device (4) and the mounting bracket (1). Under the elastic preload of the elastic element (5), the locking device (4) can press against the locking member (8), and the pressed locking member (8) can lock the rotating shaft (7) and lock the trailer hook (2) in the retracted or unfolded position.

7. The trailer towing device according to claim 6, characterized in that: The locking mechanism includes an anti-mislocking unit; The locking device (4) is driven to slide relative to the mounting bracket (1), which can release the locking member (8) from locking the rotating shaft (7) and compress the elastic element (5). When the locking member (8) releases the locking of the rotating shaft (7), the anti-mislocking unit is triggered by the rotating shaft (7) and can maintain the compression of the elastic element (5) by the locking device (4).

8. The trailer towing device according to claim 7, characterized in that: The anti-mislocking unit includes an anti-mislocking groove (704) on the rotating shaft (7), an anti-mislocking component (9) on the mounting bracket (1), and a limiting hole (406) on the locking device (4). The anti-mislocking component (9) is movably disposed in the mislocking component through hole (1013) on the mounting bracket (1). The anti-mislocking groove (704) is a plurality of grooves spaced apart circumferentially along the rotating shaft (7). When the trailer hook (2) is in the retracted position or the unfolded position, the anti-mislocking component (9) is embedded in one of the anti-mislocking grooves (704).

9. The trailer towing device according to claim 6, characterized in that: The transmission mechanism includes a dial (6), which is connected to the drive motor (3) and can rotate under the external force output by the drive motor (3). The dial (6) is provided with a pin (601). The locking device (4) is provided with an unlocking ramp (401), and the dial (6) is driven by the external force. The pin (601) can press against the unlocking ramp (401) to push the locking device (4) to slide along the axis of the rotating shaft (7).

10. A vehicle, characterized in that: The vehicle is equipped with a trailer towing device as described in any one of claims 1 to 9.

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