Trailer coupling mechanism and its trailer

Abstract

A trailer coupling mechanism, characterized in that it comprises: a first coupling unit, a connecting part movably connected to the first coupling unit, and a second coupling unit connected to the connecting part; wherein the first coupling unit is also connected to a trailer, and the second coupling unit is connected to an auxiliary vehicle; wherein the second coupling unit is adjustably arranged relative to the connecting part.

Description

Technical FieldThe present invention relates to the technical field of trailers for auxiliary vehicles, in particular a trailer hitch mechanism and its trailer.Prior ArtDue to the increasing popularity of camping, more and more users prefer small trailers for the transport of food and outdoor equipment. Today's trailers are designed for manual transport by the user, while some can also be connected to a towing vehicle to be towed. However, the existing connection structure between the trailer used for the assist vehicle and the assist vehicle is fixed, so that the connection structure of the trailer cannot be matched to various assist vehicles, which greatly restricts its user-friendliness.Content of the InventionThe purpose of the invention is to overcome the deficiencies of the existing technology and to provide a hitch mechanism and its trailer to solve the technical problem that the existing hitch mechanism cannot be adapted to different types of auxiliary vehicles.In order to achieve the above purpose, the invention provides the following technical solutions:In a first aspect, an embodiment of the present invention provides a hitch mechanism comprising:a first clutch unit, a connecting part movably connected to the first clutch unit, and a second clutch unit,which is connected to the connecting part; wherein the first coupling unit is also connected to a trailer and the second coupling unit is connected to an auxiliary vehicle; wherein the second coupling unit is arranged displaceably relative to the connecting part.In addition, the second coupling unit comprises: a quick-action closure part, a threaded rod which is fixedly connected to the quick-action closure part, and a fixed seat which is fastened to the threaded rod, wherein the threaded rod is adjustable and fastened in any position relative to the fixed seat.Moreover, an external thread is provided in the outer wall of the threaded rod, a threaded hole is provided in the interference fit, and the threaded rod is screwed in the threaded hole.Moreover, a first nut is also screwed to the outer end of the threaded rod, which nut is arranged on the outer side of the fixed seat.Moreover, the quick-action closure part comprises: a clamping block articulated for opening and closing, a screw screwed through the clamping block, and a movable handle attached to the end cap end of the screw, the handle being provided with a cam part cooperating with the clamping block, the clamping block enclosing a coupling jaw in the closed state.Moreover, the clamping block includes a front clamping plate, a rear clamping plate, and a rotation axis, the front clamping plate and one end of the rear clamping plate are hinged by the rotation axis, a plurality of through holes are provided also in the hinged position of the front clamping plate or the rear clamping plate, the rotation axis is adjustably inserted into the through hole, a waist-shaped hole is also provided in the open and closed ends of the front clamping plate and the rear clamping plate, the screw is adjustably connected in the waist-shaped hole. Moreover, the connecting part has two connecting ends disposed on the side of the opening and a connecting apex disposed at an equal linear distance from the two connecting ends, the first coupling unit is connected to the connecting apex, and each of the two connecting ends is provided with one of the second connecting parts.In addition, the first coupling unit includes a locking part, a moving part, a jaw part, a screw unit, and a rotation axis part, wherein the screw unit is passed through the center of the locking part, the moving part, and the jaw part in order, the rotation axis part is passed through the jaw part, and the connection part is movably connected to the rotation axis part. Moreover, a first gap is provided between the connecting part and the jaw part such that the connecting part is movable in a vertical direction relative to the jaw part. In addition, the screw unit includes a connecting rod and a nut connected to the connecting rod, wherein a second gap is provided between an end of the connecting rod near an end of the rotation axis part and the connecting apex, the second gap having a width smaller than the height of the nut.In a second aspect, the utility model further provides a trailer comprising a hitch mechanism as described in any of the preceding items and a trailer body connected to the hitch mechanism.The hitch mechanism according to this invention uses a connection structure of a threaded structure between the second hitch unit and the connection part, thereby allowing both adjustable connection between the second connection part and the assist vehicle, moreover, the first connection unit is connected to the connection part via a rotatable and vertically movable connection structure, which can improve flexibility of the movable following process between the trailer body and the hitch mechanism, so that the tow of the trailer with an assist vehicle is more convenient.The above description is merely an overview of the technical program of the present invention in order that the technical means of the invention that can be realized according to the content of the specification can be better understood, and in order to make the above and other purposes, features, and advantages of the present invention more apparent and easily understood, the following preferred embodiments are described in detail as follows.Details of the DrawingsFIG. 1 is a schematic illustration of the overall structure of the trailer of one embodiment of the present invention; FIGS. 2 and 3 are schematic views showing different views of the structure of a part of the hitch mechanism of an embodiment of the present invention; FIG. 4 is a schematic illustration of the lateral structure of the hitch mechanism of an embodiment of the present invention; FIGS. 5 and 6 are schematic views showing different views of the structure of a part of the first clutch unit of the hitch mechanism of an embodiment of the present invention; FIGS. 7 and 8 are schematic views showing different views of the structure of a part of the second clutch unit of the hitch mechanism of an embodiment of the present invention; FIG. 9 is a schematic view of the partially enlarged structure in FIG. 4 ; FIG. 10 is a schematic view of the partially enlarged structure in FIG. 3 ; FIG. 11 is a schematic view of the partially enlarged structure in FIG. 7 ; FIG. 12 is a schematic illustration of a further, partially enlarged structure in FIG. 7.List of reference numbers:1-trailer; 2-hitch mechanism; 11-trailer body; 111 frame; 112 wheel; 25-spring member; 201-first gap; 202-second gap; 21-connecting part; 211-connecting apex; 212-connecting end; 213-connecting end; 22-first coupling unit; 221-locking part; 2211-front locking plate; 2212-rear locking plate; 2213-screw-nut unit; 2214-connecting hole; 222-moving part; 223-jaw part; 224-rotating axis part; 225-screw unit; 2251-connecting rod; 2252-nut; 23-second coupling unit; 24-second coupling unit; 231-tight seat; 232-threaded rod; 233-quick-locking part; 2331-clamping block; 2332-screw; 2333-movable handle; 2334 clutch jaw; 2313 outer sleeve; 2314 inner sleeve; 2312 outer nut; 2311 inner nut; 214 cross sleeve; 23311 front clamping plate; 23312 rear clamping plate; 23313 hinged part; 23316 hinged part; 23314 rotation axis; 23315 through hole; 23310 waist-shaped hole.Specific EmbodimentsFor a better understanding of the purpose, technical solution and advantages of the invention, the accompanying drawings and embodiments will be summarized below to explain the invention in detail.Hereinafter, the technical solutions in the embodiments of the invention will be clearly and fully described in the embodiments of the invention in conjunction with the accompanying drawings, and it is understood that the described embodiments represent only a part of the embodiments of the invention and not all the embodiments. Based on the embodiments in the present invention, all other embodiments that a person skilled in the art can achieve without any depletion fall within the scope of this invention.In describing the utility model, it is to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "ceiling", "floor", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the accompanying drawings, they are merely for facilitating the description of the utility model and for facilitating the description, and do not mean that the device or element to which reference is made has a particular orientation or must be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as meaning a relative meaning or implicit definition of the number of technical features stated. Thus, a feature defined as a "first" or "second" may expressly or silently include one or more such features. In the specification of the utility model, "plural" means two or more unless expressly and specifically stated otherwise.In the present invention, the terms "mounting", "connection", "coupling", "fastening" and the like are to be understood in a broad sense unless expressly stated and restricted, for example, it may be a fixed connection, a detachable connection or a one-piece unit; moreover, it may be a mechanical connection or an electrical connection, a direct connection or an indirect connection via an intermediate medium; moreover, it may be a connection within the two elements or an interactive relationship between the two elements. Those skilled in the art will appreciate the specific meaning of the above terms in the context of the invention from the particular circumstances.Unless expressly stated otherwise, in the present invention "above" or "below" the first feature of the second feature may be a direct contact between the first and second features or a contact between the first and second features may be not direct but by means of an additional feature between them. Moreover, the first feature that is "above", "above", and "on" the second feature includes the first feature that is directly and diagonally above the second feature, or simply means that the first feature is horizontally higher than the second feature. The terms "below," "below," and "below" of the second feature include the first feature being directly below and diagonally below the second feature, or simply indicate that the first feature has a lower height in the horizontal direction than the second feature.In the descriptions of this specification, the use of reference terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" refers to the specific features, structures, materials, or characteristics described in connection with the respective embodiment or example being included in at least one embodiment or example of the invention. The schematic representations of the above terms in this description should not be construed as necessarily referring to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined as appropriate in one or more embodiments or examples.Due to the increasing popularity of camping, more and more users prefer small trailers for the transport of food and outdoor equipment. Today's trailers are designed for manual transport by the user, while some can also be connected to a towing vehicle to be towed. However, the existing connection structure between the trailer used for the assist vehicle and the assist vehicle is fixed, so that the connection structure of the trailer cannot be matched to various assist vehicles, which greatly restricts its user-friendliness. For this reason, in the present embodiment, a hitch mechanism 2 has been provided based on the above-mentioned requirements.As shown in FIGS. 1 to 10, the present embodiment discloses a hitch mechanism 2, the hitch mechanism 2 for towing a trailer to hitch the trailer 1 to an auxiliary vehicle such that the trailer 1 follows the auxiliary vehicle, the auxiliary vehicle including an electric vehicle and a bicycle and the like.The hitch mechanism 2 includes: a first hitch unit 22, a link part 21 movably connected to the first hitch unit 22, and a second hitch unit 23 connected to the link part 21; wherein the first hitch unit 22 is also connected to the trailer 1, and the second hitch unit 23 is also connected to an auxiliary vehicle (not illustrated in the figures). The second coupling unit 23 is arranged so as to be displaceable relative to the connecting part 21. Since the auxiliary vehicle is connected to the second hitching unit 23, the distance between the auxiliary vehicle and the hitching mechanism 2 can be adjusted when the second hitching unit 23 is adjustable in position with respect to the connecting part 21.The second coupling unit 23 of this embodiment can be connected to a seat support rod of the assist vehicle and also to a rear post of the frame of the assist vehicle, wherein the rear post is a U-support structure that establishes the connection between the axis of rotation of the rear wheel and the frame. In this embodiment, for illustration, the hitch mechanism 2 is connected to the rear post of the host vehicle, the width between the U-structures of the rear posts of different host vehicles is different, and the connection part 21 is generally made of a more rigid material that does not itself have a large moving space. Therefore, the second coupling unit 23 of this embodiment is movable relative to the connecting part 21, whereby the front and rear positions of the second coupling unit 23 can be changed to compensate for the distance of the rear post of different models of assist vehicles. In this embodiment, the second coupling unit 23 is adjustable with respect to said connecting part 21 by means of a distance adjustment in a direction perpendicular to the towing direction of the trailer, i.e. the distance of the side of this hitch mechanism 2 with respect to the auxiliary vehicle. Of course, it will be understood that in other embodiments, adjustment of the connecting member 21 with the second hitch assembly 24 also enables adjustment of the distance between the trailer and the auxiliary vehicle in the tow direction.As shown in FIGS. 7 and 8, the second coupling unit 23 includes a quick-release part 233, a threaded rod 232 fixedly connected to the quick-release part 233, and a fixed seat 231 connected to the threaded rod 232, wherein the fixed seat 231 is also connected to the connecting part 21, and the threaded rod 232 is adjustable and fixable in an arbitrary position with respect to the fixed seat 231. In this embodiment, the second clutch unit 23 is provided in two groups and disposed opposite to the connecting part 21, the two forming a space for accommodating the rear wheel of the assist vehicle and the associated structures. Since different types of vehicles have different construction spaces for their rear wheels and associated structures, the hitch mechanism 2 is to be designed with a width adjustability. The threaded rod 232 can be fixed at any position with respect to the seat 231 after adjustment, and the connecting part 21 is connected to the assist vehicle by means of this second coupling unit 23, so that this adjustment structure is designed to realize the adjustment of the connection space between the connecting part 21 and the assist vehicle, to adapt to the various types of assist vehicles and to extend its versatility. The structure of adjustable fixing between the threaded rod 232 and the seat 231 in any position can be implemented in a number of different solutions.In this embodiment, the seat 231 includes an outer sleeve 2313 connected to the threaded rod 232, an outer nut 2312 disposed outside the outer sleeve 2313 and screwed to the threaded rod 232, an inner sleeve 2314 connected to the threaded rod 232, and an inner nut 2311 disposed inside the inner sleeve 2314 and screwed to the threaded rod 232.In other embodiments, a connecting structure of a connecting rod and a tube sleeve may also be used between the threaded rod 232 and the fixed seat 231, wherein the connecting rod is provided with a plurality of connecting grooves and the tube sleeve is provided with a plurality of connecting holes, which are screwed radially to the connecting holes and the connecting grooves with the aid of screws in order to realize the setting and fixing of the two in a plurality of different positions. As shown in FIG. 8, the quick-release part 233 includes: a clamping block 2331 hinged for opening and closing; a bolt 2332 screwed through the clamping block 2331; and a movable handle 2333 fixed to the end cap end of the bolt 2332, wherein the movable handle 2333 is provided with a cam part that mates with the clamping block 2331, and wherein the clamping block 2331 encloses a coupling jaw 2334, in the closed state, the coupling jaw 2334 being for inserting a rear seat connecting post or the auxiliary vehicle frame supporting post. Specifically, the bolt 2332 is mounted on the other side of the clamp block 2331 outside the joint position, and when the bolt 2332 is loosened, the clutch jaw 2334 can be opened to facilitate connection to the assist vehicle. After the locking of the screw 2332, the movable handle 2333 provided with a cam part is tilted so that its cam part abuts on the surface of the clamping block 2331, so that the movable handle 2333 locks the screw 2332 and secures it to the clamping block 2331.As shown in FIGS. 7, 8, 11 and 12, the clamping block 2331 includes a front clamping plate 23311, a rear clamping plate 23312, and a rotation axis 23314, one end of the front clamping plate 23311 is hingedly connected to one end of the rear clamping plate 23312 by the rotation axis 23314, and the hinged parts 23313 / 23316 of the front clamping plate 23311 or the rear clamping plate 23312 is further provided with a plurality of through holes 23315, the rotation axis 23314 is adjustably inserted into the through hole 23315, and a waist-shaped hole 23310 is disposed at the open end of the front clamping plate 23311 and the rear clamping plate 23312, and the screw 2332 is adjustably coupled into the waist-shaped hole 23310. The front clamping plate 23311 and the rear clamping plate 23312 are mutually reversible L-shaped plates, the end plates of the L-shaped plates are hinged parts and a rotation axis 23314 is screwed through the through hole 23315; on the one hand, the front clamping plate 23311 and the rear clamping plate 23312 can be rotated to open and close around this rotation axis 23314, and on the other hand, by adjusting the rotation axis 23314 when inserted into the various said through holes 23315, the width of the clutch jaw 2334 between the front clamping plate 23311 and the rear clamping plate 23312 in the front and rear directions can be varied to be compatible with the support posts of the various bicycles. For some of the support posts of the bi-flat assist vehicle, the width is larger, therefore, the waist-shaped holes 23310 are still provided at the open and closed ends of the front clamping plate 23311 and the rear clamping plate 23312, and the longitudinal width of the coupling jaw 2334 is varied by adjusting the various positions of the screws 2332 in the waist-shaped holes 23310 to make them compatible with support posts of various bi-flat configurations.As shown in FIG. 3, the seat 231 is connected to the connecting part 21, the connecting part 21 has two connecting ends 212 and 213 on the open side and a connecting apex 211 at the same linear distance from both connecting ends 212 and 213, the first coupling unit 22 is connected to the connecting apex 211, and each of the two connecting ends 212 and 213 is provided with one of the second coupling units 23 and 24, respectively. That is, the body of the connecting part 21 may have any structure or shape, wherein between the connecting apex 211 and the two connecting ends 212, 213, an isosceles triangle distribution is formed with the connecting apex 211 as an apex, and a gap is formed between the connecting ends 212 and 213, and when connected to the assist vehicle, the rear wheel part of the assist vehicle is disposed in the gap, the gap forming an avoidance space for the connection of the assist vehicle. The second coupling unit 23 is fixed to a support post on one side of the frame, and the second coupling unit 24 is fixed to a support post on the other side of the frame. When this hitch mechanism 2 is connected to the support rod of the seat of the assist motor vehicle, only one set of the second hitch unit is required at the connecting part 21.In this embodiment, the connecting part 21 is a U-shaped tube or a rod, in other embodiments, the connecting part 21 may also be an isosceles triangle or any structure that satisfies the distribution of the connecting apex 211 and the connecting ends 212 and 213 forming an isosceles triangle. The connecting part 21 of the U-shaped tube or rod has a connecting apex 211 as the upper end of the U-shaped structure and connecting ends 212 and 213, respectively, as the lower end of the U-shaped structure. The connecting ends 212 and 213 comprise transverse sleeves 214 connected to the threaded rod 232 and held in position by the seat 231. As shown in FIG. 7, the cross sleeve 214 is substantially perpendicular to the long arm of the connecting part 21 of the U-shaped tube, the cross sleeve 214 is connected to the threaded rod 232, and the outer sleeve 2313 and the inner sleeve 2314 are inserted into the cylinder cavity of the cross sleeve 214 through the openings on both sides of the cross sleeve 214; moreover, the outer sleeve 2313 and the inner sleeve 2314 are offset at opposite ends, the total length of the offset outer sleeve 2313 and the inner sleeve 2314 being slightly larger than the length of the cross sleeve 214, so that the cross sleeve 214 is rotatable along the seat 231. To adjust the distance of the quick-action locking parts 233, the inner nut 2311 and the outer nut 2312 are unscrewed, the outer sleeve 2313 and the inner sleeve 2314 are positioned relative to the transverse sleeve 214, the outer nut 2312 and the inner nut 2311 are adjusted and then secured again.As shown in FIGS. 5 and 6, the first coupling unit 22 includes: a locking part 221, a moving part 222, a jaw part 223, a screw unit 225, and a rotation axis part 224, wherein the screw unit 225 is sequentially disposed through the center of the locking part 221, the moving part 222, and the jaw part 223, the rotation axis part 224 is disposed through the jaw part 223, and the connection part 21 is movably connected to the rotation axis part 224. The screw unit 225 is disposed transversely in the middle of the locking part 221, the moving part 222, and the jaw part 223, and a rotation axis part 224 is disposed longitudinally in the jaw part 223.The locking part 221 includes a front locking plate 2211 and a rear locking plate 2212 which abut against each other in reverse, and a bolt-nut unit 2213 which detachably connects the front locking plate 2211 and the rear locking plate 2212 to each other. After the front lock plate 2211 and the rear lock plate 2212 are fixedly connected by the bolt-nut unit 2213, a connecting hole 2214 used for inserting the post of the trailer 1 is formed therebetween.The moving part 222 is a square shaped key block having an opening structure on one of the opposite sides, wherein the moving part 222 may be provided with one or more threads, all of which are passed through the screw unit 225. When the locking part 221 and the jaw part 223 are rotated with the screw unit 225, the moving part 222 is movable by the screw unit 225, so that the locking part 221 and the jaw part 223 rotate more smoothly.As shown in FIG. 9, a first gap 201 is provided between the connecting part 21 and the jaw part 223 so that the connecting part 21 is movable in the vertical direction relative to the jaw part 223. Specifically, the connection vertex 211 of the connection part 21 is screwed through the rotation axis part 224, the jaw part 223 is a U-shaped part, the rotation axis part 224 is screwed through the opening of the U-shaped part, the connection vertex 211 of the connection part 21 extends into the opening of the U-shaped part and rotates left and right in a horizontal plane with the rotation axis part 224, due to the first gap 201 between the jaw part 223 and the outer wall of the connection vertex 211 of the connection part 21, the connection part 21 can also move up and down in the vertical direction along the rotation axis part 224. The purpose of providing a first gap 201 between the connecting part 21 and the jaw part 223 is that when the trailer 1 is connected to the assist vehicle by this hitch mechanism 2 and the assist vehicle and the trailer 1 travel on a non-planar road, the two have front and rear high and low positions, and at this time, compatibility with this non-planar road can be established by the first gap 201 between the connecting part 21 and the jaw part 223 and the interference effect of the high and low positions of the two can be reduced.In addition, the screw unit 225 includes: a connecting rod 2251; and a nut 2252 connected to the connecting rod 2251, wherein a second gap 202 is disposed between an end portion of the connecting rod 2251 near the rotation axis part 224 and the connecting apex 211, wherein the second gap 202 has a width smaller than the height of the nut 2252. As shown in FIG. 9, the hitch mechanism 2 may cause the nut 2252 to loosen and retreat due to vibration during long-term use, and in order to avoid the risk of loosening the nut 2252, the second gap 202 is set to a distance slightly smaller than the height of the nut 2252 that can be limited by the connecting apex 211, thereby preventing it from completely loosening from the connecting rod 2251.As shown in FIG. 1, this embodiment also provides a trailer 1 comprising a trailer body 11 and a hitch mechanism 2 attached to the trailer body 11, the hitch mechanism 2 being constructed as described above. The trailer body 11 includes a frame 111 and wheels 112 fixed to the lower side of the frame 111, and a front side edge of the frame 111 is fixed to a locking part 221 of the second coupling unit 22.Also, because there is a steering angle between the trailer 1 and the assist vehicle when the assist vehicle pulls the trailer 1 on a non-straight road, and this steering angle is too large to interfere with normal travel, two spring members 25 are provided between the connecting part 21 and the front of the frame 111, the spring member 25 being connected at one end to the connecting part 21 and at the other end to the frame 111, the two spring members 25 being formed with the front of the frame 111 in a substantially isosceles triangular shape so that they can be quickly reset after rotation by the spring force to keep them in the lane.The hitch mechanism 2 of this embodiment and the trailer 1 thereof realizes an adjustable connection between the second hitch unit 23 and the host vehicle by adopting a screwed connection between the second hitch unit 23 and the connection part 21, and simultaneously adopts a rotatable and vertically movable connection between the first hitch unit 22 and the connection part 21, moreover, by using a movable connection between the second hitch unit 23 and the host vehicle, flexibility in mobile follow-up between the trailer body and the hitch mechanism can be improved, so that the host vehicle can more easily tow the trailer.The above is only an embodiment for further illustrating the technical contents of the present invention in order to facilitate the readers's understanding, but it does not mean that the embodiment of the present invention is limited to these, and all technical extensions or novelty items made according to the present invention are protected by the present invention. The scope of the invention is defined by the claims.

Claims

A hitch mechanism, characterized in that it comprises: a first hitch unit, a link member movably connected to the first hitch unit, and a second hitch unit connected to the link member; wherein the first hitch unit is also connected to a trailer, and the second hitch unit is connected to an auxiliary vehicle; wherein the second hitch unit is adjustably disposed relative to the link member.The trailer coupling mechanism according to claim 1, characterized in that the second coupling unit comprises: a quick-locking part, a threaded rod firmly connected to the quick-locking part, and a seat fixed to the threaded rod, wherein the threaded rod is adjustable and fixed in any position relative to the seat.The tow bar mechanism of claim 2, wherein the interference fit comprises an outer sleeve connected to the threaded rod, an outer nut disposed outside the outer sleeve and threaded to the threaded rod, an inner sleeve connected to the threaded rod, and an inner nut disposed inside the inner sleeve and threaded to the threaded rod.A trailer hitch mechanism according to claim 3, characterized in that the connecting part is further provided with a transverse sleeve which is fixed to the outer wall of the outer sleeve and the inner sleeve.The trailer hitch mechanism according to claim 2, characterized in that the quick-action closure part comprises: a clamping block articulated for opening and closing, a screw screwed through the clamping block, and a movable handle attached to the end cap end of the screw, the movable handle being provided with a cam part interacting with the clamping block, the clamping block enclosing a hitch jaw in the closed state.The tow bar mechanism according to claim 1, characterized in that the clamping block comprises a front clamping plate, a rear clamping plate and a rotation axis, the front clamping plate and an end of the rear clamping plate being hinged by the rotation axis, a plurality of through holes being provided also in the hinged position of the front clamping plate or the rear clamping plate, the rotation axis being adjustably inserted into the through hole, a waist-shaped hole being also provided in the open and closed ends of the front clamping plate and the rear clamping plate, the screw being adjustably connected in the waist-shaped hole.The hitch mechanism according to claim 6, characterized in that the connecting part has two connecting ends disposed on the side of the opening and a connecting apex disposed at the same linear distance from the two connecting ends, the first coupling unit is connected to the connecting apex, and each of the two connecting ends is provided with one of the second connecting parts, the first coupling unit includes a locking part, a moving part, a jaw part, a screw unit, and a rotation axis part, the screw unit is passed through the center of the locking part, the moving part, and the jaw part in sequence, the rotation axis part is passed through the jaw part, and the connecting part is movably connected to the rotation axis part.A trailer hitch mechanism according to claim 7, characterized in that a first gap is provided between the connecting part and the jaw part such that the connecting part is movable in a vertical direction relative to the jaw part.The tow bar mechanism according to claim 7, characterized in that the screw unit comprises a connecting rod and a nut connected to the connecting rod, wherein a second gap is provided between an end of the connecting rod near an end of the pivot shaft part and the connecting apex, wherein the second gap has a width smaller than the height of the nut.A trailer characterised in that it comprises a hitch mechanism according to claim 1 and a trailer body coupled to the hitch mechanism.

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