Traction connecting device

Abstract

The utility model aims to provide a traction connecting device which comprises a connecting assembly, a pull hanging assembly and a positioning unit, the connecting assembly comprises a connecting part and a longitudinal arm, a first positioning groove and a second positioning groove are formed in the two sides of the longitudinal arm, the pull hanging assembly comprises a first positioning hole and a second positioning hole, and the positioning unit is provided, when the pulling assembly moves in the extending direction of the longitudinal arm, the pair of first positioning holes can be aligned with the first positioning grooves in different positions respectively, meanwhile, the pair of second positioning holes are aligned with the corresponding second positioning grooves at the same time, and the pair of first positioning holes and the first positioning grooves in the aligned state define a channel allowing a positioning part to be inserted therein. And the pair of second positioning holes and the second positioning groove in the aligned state define a channel for the positioning part to insert. The traction connecting device of the structure has the advantages of being adjustable in ball head height and good in strength.

Description

TECHNICAL FIELD

[0001] The utility model relates to trailer connecting assembly technical field especially relates to a kind of traction connecting device. BACKGROUND

[0002] Trailer is the important way of modern goods transport, trailer is connected with towing vehicle by traction connecting device, goods are loaded on trailer, and are transported by towing vehicle.

[0003] At present, the commonly used traction connecting device on market is ball head type, it includes connecting arm and ball head, wherein the towing vehicle usually includes receiver cavity or pipe, connecting arm is inserted into receiver cavity or pipe and fixedly connected with towing vehicle, ball head is connected with trailer. In order to match the structure of different trailer and towing vehicle, the demand of adjusting ball head to different height and fixing is born. In order to meet this demand, the existing traction connecting device usually configures connecting arm and ball head into split structure, multiple through holes are set in connecting arm along different height positions, and then ball head is fixed to different height positions of connecting arm by locking pin.

[0004] However, the inventor finds that the way of setting through hole in connecting arm can reduce the strength of connecting arm, since the goods loaded on trailer sometimes can reach tens of tons, how to provide a kind of traction connecting device with adjustable ball head height and good strength is the problem to be solved urgently at present. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of traction connecting device with adjustable ball head height and good strength.

[0006] To realize the traction connecting device of preceding described purpose, it includes:

[0007] Connecting assembly includes:

[0008] Connecting portion, the traction connecting device is connected with towing vehicle by the connecting portion;And

[0009] Longitudinal arm includes multiple first positioning slots and multiple second positioning slots distributed at intervals along the extension direction of the longitudinal arm, the longitudinal arm has oppositely arranged first side and second side, the connecting portion is connected with the longitudinal arm at the first side, the multiple first positioning slots are set in the first side,

[0010] The multiple second positioning slots are set in the second side;

[0011] Tow hitch assembly includes:

[0012] At least one tow hitch, the object to be towed is connected with the traction connecting device by the tow hitch;And

[0013] a pair of first positioning holes located at a first position; and

[0014] a pair of second positioning holes located at a second position; and

[0015] A positioning unit providing at least two positioning portions for connecting the towing assembly to the connecting assembly;

[0016] In which, when the towing assembly moves along the extension direction of the longitudinal arm, a pair of first positioning holes can be aligned with the first positioning slots at different positions respectively, and after the first positioning holes are aligned with the first positioning slots, a pair of second positioning holes are simultaneously aligned with the corresponding second positioning slots. In the aligned state, the pair of first positioning holes and the first positioning slots define a channel for the positioning part to be inserted; in the aligned state, the pair of second positioning holes and the second positioning slots define a channel for the positioning part to be inserted.

[0017] In one or more embodiments, the thickness of the longitudinal arm is defined between the first side and the second side of the longitudinal arm, and the depths of the first positioning groove and the second positioning groove are both not less than one quarter of the thickness.

[0018] In one or more embodiments, one of the longitudinal arm and the towing assembly is provided with a sliding groove, and the other has a protrusion, and the protrusion is slidably connected to the sliding groove to guide the towing assembly to move along the extension direction of the longitudinal arm.

[0019] In one or more embodiments, the connecting assembly is an L-shaped bracket, the connecting portion is a transverse arm extending vertically from the end of the longitudinal arm, and the L-shaped bracket has a space on the first side of the longitudinal arm for accommodating the towing assembly;

[0020] Wherein, the sliding groove is opened in the longitudinal arm, and the protrusion is a rotating shaft arranged on the towing component.

[0021] In one or more embodiments, the towing connection device has a use state and a storage state, the towing assembly is located on the second side of the longitudinal arm in the use state, and is located on the first side of the longitudinal arm in the storage state;

[0022] Among them, the positioning holes are configured as follows:

[0023] In use, a pair of the first positioning holes can be moved to align with the first positioning slots at different positions to form a channel, and at the same time, a pair of the second positioning holes can be aligned with the corresponding second positioning slots to form a channel, and the positioning parts are inserted into the channels at the same time, so that the trailer assembly can be fixed to different positions of the longitudinal arm through the positioning unit;

[0024] The towing assembly is flipped relative to the longitudinal arm to move from the use state to the storage state, wherein in the storage state, a pair of the first positioning holes can be moved to be aligned with at least one of the second positioning grooves to form a channel, and at the same time, a pair of the second positioning holes can be aligned with the corresponding first positioning grooves to form a channel, and the positioning portion is inserted into the channel, so that the towing assembly can be fixed in the storage state by the positioning unit.

[0025] In one or more embodiments, the towing assembly further includes a pair of third positioning holes, wherein in a use state, the third positioning holes are aligned with the remaining first positioning grooves or the second positioning grooves to form a channel allowing the positioning portion to be inserted;

[0026] At this time, the first positioning hole, the second positioning hole, and the third positioning hole are distributed in the towing component in a triangle shape, and the rotating shaft is located in the triangle.

[0027] In one or more embodiments, the towing assembly includes a holder and a towing head assembly connected thereto, the holder including a main body and a pair of wing plates, the towing head assembly being connected to the main body, wherein in an assembled state, the pair of wing plates are located on both sides of the width of the longitudinal arm, and the protrusion is provided on the wing plates;

[0028] A pair of the first positioning holes and a pair of the second positioning holes are respectively opened in the wing plate, and the towing head assembly has at least one towing head.

[0029] In one or more embodiments, the towing head assembly includes at least one avoidance surface, and the towing head is not disposed on the avoidance surface;

[0030] The towing head assembly is rotatably connected to the retaining frame, so that when the towing head assembly is stored, the towing head assembly can be rotated so that the avoidance surface faces the transverse arm.

[0031] In one or more embodiments, the retaining frame is provided with a first fixing hole and a second fixing hole, wherein the first fixing hole is perpendicular to the second fixing hole, and the towing head assembly is provided with a third fixing hole, and when the towing head assembly rotates relative to the retaining frame, the third fixing hole can be rotated to a position aligned with the first fixing hole and the second fixing hole respectively;

[0032] The traction connection device further includes a positioning pin configured to be inserted into the aligned third fixing hole and the first fixing hole and the third fixing hole and the second fixing hole.

[0033] In one or more embodiments, the positioning unit comprises at least two pins, which provide the positioning portion.

[0034] The utility model discloses the beneficial effect lies in:

[0035] Through the configuration multiple first positioning slot and second positioning slot, make the connection component and towed component between different relative position relations, as long as first positioning slot, second positioning slot respectively with first positioning hole, second positioning hole alignment, can realize the fixed connection of both through the insertion positioning shaft, thereby realize the towed component fixed at different vertical height, to adapt to different configuration's towed vehicle and trailer, the towed vehicle of this configuration simultaneously has good structural strength.

[0036] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, which can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0037] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are for the purpose of illustrating the preferred embodiments only and are not to be considered as limiting of the present application. Moreover, like reference numerals in the attached figures are used to denote like components. In the drawings:

[0038] Figure 1 A perspective view according to some embodiments of the present towed connection device is shown;

[0039] Figure 2 A front view according to some embodiments of the present towed connection device is shown;

[0040] Figure 3 An exploded view according to some embodiments of the present towed connection device is shown;

[0041] Figure 4 A half-section view according to some embodiments of the present towed connection device is shown;

[0042] Figure 5 A view according to some embodiments of the present towed connection device is shown at different heights;

[0043] Figure 6 A perspective view according to some embodiments of the present towed connection device is shown in a storage state;

[0044] Figure 7 A front view according to some embodiments of the present towed connection device is shown in a storage state;

[0045] Figure 8 A half-section schematic diagram of some embodiments of the traction connection device in the retracted state is shown. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0048] In the description of the embodiments of the present application, the technical terms "first XX" and "second XX", such as "first positioning groove" and "second positioning groove", are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0049] In order to provide a trailer connection with an adjustable ball head height and good strength, a towing connection device is provided according to some embodiments of the present disclosure. Figure 1 shows a perspective schematic diagram of some embodiments of the traction connection device, Figure 2 shows a front view of some embodiments of the traction connection device, Figure 3 shows an exploded schematic diagram of some embodiments of the traction connection device, Figure 4 A half-section schematic diagram of some embodiments of the traction connection device is shown.

[0050] The traction connection device comprises a connection assembly 1, a towing assembly 2 and a positioning unit 3. The connection assembly 1 comprises a connecting part 11 and a longitudinal arm 12. The traction connection device is connected to the traction carrier through the connecting part 11, for example, the connecting part 11 is fixed to the traction carrier through fasteners such as bolts. The longitudinal arm 12 comprises a plurality of first positioning grooves 121 and a plurality of second positioning grooves 122. The plurality of first positioning grooves 121 and the plurality of second positioning grooves 122 are respectively arranged on opposite sides of the longitudinal arm 12. Specifically, the longitudinal arm 12 comprises a first side 1201 and a second side 1202 arranged oppositely. The connecting part 11 is connected to the longitudinal arm 12 at the first side 1201. The plurality of first positioning grooves are arranged on the first side 1201. The plurality of second positioning grooves are arranged on the second side 1202. The plurality of first positioning grooves 121 and the plurality of second positioning grooves 122 are respectively distributed along the extension direction 120a of the longitudinal arm 12.

[0051] The towing assembly 2 comprises at least one towing head 21, a pair of first positioning holes 221 located at a first position, and a pair of second positioning holes 222 located at a second position. The object to be towed (such as a trailer) is connected to the traction connection device through the towing head 21. The positioning unit 3 provides at least two positioning parts 30 for connecting the towing assembly 2 to the connection assembly 1.

[0052] When the towing assembly 2 moves along the extension direction 120a of the longitudinal arm 12, the pair of first positioning holes 221 can move to a position aligned with the first positioning grooves 121 at different positions. At the same time, the pair of second positioning holes 222 are aligned with the corresponding second positioning grooves 122. The positioning parts 30 are configured to be inserted into the aligned first positioning grooves 121 and the pair of first positioning holes 221, and the aligned second positioning grooves 122 and the pair of second positioning holes 222, thereby fixing the towing assembly 2. That is, the pair of first positioning holes 221 and the first positioning grooves 121 in the aligned state define a channel for the positioning parts 30 to be inserted. The pair of second positioning holes and the second positioning grooves 122 in the aligned state define a channel for the positioning parts 30 to be inserted. The two positioning parts 30 are respectively inserted into the two channels defined to achieve the fixation of the towing assembly 2. By moving the pair of first positioning holes 221 to different positions, and inserting the positioning parts 30 into the aligned first positioning grooves 121 and the pair of first positioning holes 221, and the aligned second positioning grooves 122 and the pair of second positioning holes 222, the towing assembly 2 is fixed to the connection assembly 1 at different positions along the longitudinal arm 12. For example, in a specific embodiment, Figure 2 the towing head 21 shown in FIG. 1 is at a first height, Figure 5 the towing head 21 shown in FIG. 2 is at a second height. It can be understood that the pair of first positioning holes 221 are coaxially arranged, and the pair of second positioning holes 222 are also coaxially arranged. At the same time, the first positioning holes 221 and the second positioning holes 222 are at different positions in the same plane.

[0053] By configuring multiple first positioning grooves 121 and second positioning grooves 122, the connecting component 1 and the towing component 2 in different relative position relationships can be fixedly connected by inserting the positioning shaft 3 as long as the first positioning groove 121 and the second positioning groove 122 are aligned with the first positioning hole 221 and the second positioning hole 222 respectively, thereby fixing the towing component 2 at different vertical heights to adapt to towing vehicles and trailers of different configurations.

[0054] In addition, see Figure 4 ,by Figure 4 Taking the direction of the middle traction connection device as a reference, when the traction vehicle tows the trailer through the traction connection device, the traction connection device will be subjected to horizontal pulling forces to the left and right. At this time, the main load-bearing components are the positioning shaft 3 and the longitudinal arm 12 on the far left in the figure. Therefore, the strength of the positioning shaft 3 and the longitudinal arm 12 are crucial to the overall structural strength of the traction connection device.

[0055] In traditional traction connection devices, a through-hole is formed in the longitudinal arm, and a positioning shaft is passed through the through-hole to connect the towing head and the longitudinal arm. In traditional traction connection devices, when being towed, the positioning shaft 3 abuts against the longitudinal arm 12 on one side of the through-hole. However, since the inner diameter of the through-hole must be no less than the diameter of the positioning shaft, the first positioning groove 121 and the second positioning groove 122 in the traction connection device with the disclosed configuration only need to be able to accommodate the positioning portion 30. The groove depth has no strong correlation with the size and diameter of the positioning portion 30. When the positioning portion 30 has the same diameter, the wall thickness of the longitudinal arm abutting against the positioning shaft in the traditional traction connection device is much smaller than the wall thickness of the longitudinal arm 12 abutting against the positioning portion 30 in the traction connection device with the disclosed configuration. Therefore, the overall structural strength of the traction connection device with the disclosed configuration is superior to that of the traditional configuration.

[0056] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In some embodiments of the present disclosure, the thickness of the longitudinal arm 12 is defined between the first side 1201 and the second side 1202 of the longitudinal arm 12, and the groove depth of the first positioning groove 121 and the groove depth of the second positioning groove 122 are each less than one-quarter of the thickness of the longitudinal arm 12. It is understood that the direction of the "thickness of the longitudinal arm 12" described herein is the same as the groove depth direction of the first positioning groove 121 and the groove depth direction of the second positioning groove 122. As previously mentioned, the strength of the longitudinal arm 12 is crucial to the overall structural strength of the traction connection device, and the groove depth affects the structural strength of the longitudinal arm 12. The aforementioned design ensures that the longitudinal arm 12 has sufficient strength.

[0058] According to some specific embodiments of the present disclosure, as shown in the figure, the longitudinal arm 12 is roughly rectangular, having an extension direction 120a (i.e., length direction), a width direction 120b and a thickness direction 120c, wherein the first positioning groove 121 and the second positioning groove 122 extend along the width direction 120b of the longitudinal arm 12 and are opened through the longitudinal arm, and multiple first positioning grooves 121 and multiple second positioning grooves 122 are respectively arranged along the extension direction 120a of the longitudinal arm 12, and are arranged in parallel between each adjacent two first positioning grooves 121 and each adjacent two second positioning grooves 122.

[0059] It is understood that in other embodiments different from those shown in the figures, the longitudinal arm 12 may also be in other suitable shapes, such as a cylindrical shape. The first positioning groove 121 and the second positioning groove 122 may also extend along the thickness direction 120c indicated in the figures.

[0060] According to some specific embodiments of the present disclosure, as shown in the figure, the first positioning groove 121 and the second positioning groove 122 are arc-shaped grooves, and correspondingly, the positioning shaft 3 is a cylindrical pin. It is understood that in other embodiments different from those shown in the figure, the first positioning groove 121 and / or the second positioning groove 122 can have other suitable shapes, such as rectangular grooves, tongue and groove, or other suitable structures, and the positioning shaft and positioning hole have matching shapes. Compared to groove structures with other configurations, configuring the first positioning groove 121 and the second positioning groove 122 as arc-shaped grooves makes alignment easier.

[0061] In some embodiments of the present disclosure, one of the longitudinal arm 12 and the hitch assembly 2 is provided with a slide groove 123, and the other has a protrusion 23. The protrusion 23 is slidably coupled to the slide groove 123 to guide the hitch assembly 2 to move along the extension direction 120a of the longitudinal arm 12. The slide groove 123 and the protrusion 23 provide guidance for the sliding movement of the hitch assembly 2 on the longitudinal arm 12, thereby improving the alignment efficiency between the locating hole and the first locating groove 121 and the second locating groove 122.

[0062] Furthermore, in some embodiments of the present disclosure, as shown in the figures, the connecting assembly 1 is an L-shaped bracket, and the connecting portion 11 is a transverse arm extending perpendicularly from the end of a longitudinal arm 12. A space is provided between the longitudinal arm 12 and the transverse arm 11 to accommodate the towing assembly. Specifically, the L-shaped bracket forms a space on the first side 1201 of the longitudinal arm to accommodate the towing assembly. The slide groove 123 is defined along the extension direction 120a of the longitudinal arm 12, and the protrusion 23 is a rotating shaft provided on the towing assembly 2. In other embodiments different from those shown in the figures, the connecting portion 11 may also be other suitable structures that facilitate mounting and securing to the towing vehicle.

[0063] Figure 6 shows a three-dimensional schematic diagram of some embodiments of the traction connection device in the stored state, Figure 7 shows a front view of some embodiments of the traction connection device in the stowed state, Figure 8 The diagram shows a half-section diagram of the stowed state of some embodiments of the traction connection device. The traction connection assembly has a use state and a stowed state. Figures 6 to 8 In the stowed state shown, when the towing assembly 2 is located in the space enclosed between the longitudinal arm 12 and the transverse arm 11, that is, located on the first side 1201 of the longitudinal arm 12, Figures 1 to 2 In the illustrated usage state, the hitch assembly 2 is located outside the longitudinal arm 12, i.e., on the second side 1202 of the longitudinal arm 12. The positioning holes are configured such that, in the usage state, a pair of first positioning holes 221 can be moved to align with first positioning slots 121 at different positions to form a channel, while a pair of second positioning holes 222 can be simultaneously aligned with corresponding second positioning slots 122 to form another channel. Thus, by inserting the positioning portion 30 into the two channels, the hitch assembly can be secured at different heights in the usage state. The towing assembly 2 is flipped relative to the longitudinal arm 12 to move from the use state to the storage state, wherein in the storage state, a pair of first positioning holes 221 can be moved to a position aligned with at least one second positioning groove 122 to form a channel, and at the same time, a pair of second positioning holes 222 can be aligned with the corresponding first positioning groove 121 to form another channel, so that the positioning portion 30 can be inserted into the two channels to fix the towing assembly 2 in the storage state. In a specific embodiment, the first positioning groove 121 and the second positioning groove 122 are basically symmetrically distributed on both sides of the longitudinal arm 12. In some other embodiments different from those shown in the figure, the first positioning groove 121 and the second positioning groove 122 can be staggered along the extension direction of the longitudinal arm 12.

[0064] When the vehicle equipped with the towing connection device is in a state of not towing the trailer, if the hitch assembly 2 is still in a position protruding from the rear side of the vehicle, the body length is increased in scenarios such as reversing, which is very inconvenient. If the towing connection device is disassembled as a whole, it needs to be installed again when used, and needs an additional place for storage. Through the foregoing design, when the towing connection device is not used, the hitch assembly 2 can be turned over and stored as a whole, improving the use experience.

[0065] It can be understood that in some embodiments different from those shown in the drawings, the sliding groove can also be provided on the hitch assembly 2, and the protruding part is provided on the longitudinal arm.

[0066] Further, in some embodiments of the present disclosure, as shown in the drawings, a pair of third positioning holes 223 are also included, specifically, the third positioning holes 223 are located in different positions from the first positioning holes 221 and the second positioning holes 222 in the same plane as shown in the drawings. In the use state, the pair of first positioning holes 221 and the pair of third positioning holes 223 can be aligned with the first positioning grooves 121 or the second positioning grooves 122 at different positions at the same time to form a channel for the positioning part 30 to insert, for example Figure 4 as shown, in the storage state, the pair of first positioning holes 221 and the pair of third positioning holes 223 can be aligned with the second positioning grooves 122 at different positions at the same time, for example Figure 8 The first positioning holes 221, the second positioning holes 222 and the third positioning holes 223 are distributed in the hitch assembly 2 in a triangular shape, and the rotating shaft 23 is located in the triangle. That is, in the orthographic projection of the plane where the first positioning holes 221, the second positioning holes 222 and the third positioning holes 223 are located, the connecting line between the first positioning holes 221, the second positioning holes 222 and the third positioning holes 223 forms a triangle, and the rotating shaft 23 is located in the triangle. Preferably, the connecting line between the first positioning holes 221, the second positioning holes 222 and the third positioning holes 223 forms an equilateral triangle, and the rotating shaft 23 is located at the geometric center of the triangle. In this way Figure 2 As a directional reference, when the towing connection device is subjected to an oblique upward or oblique downward force, the hitch assembly 2 as a whole may be twisted relative to the longitudinal arm 12, thereby causing the rotating shaft 23 to be in force against the side wall of the sliding groove 123, resulting in failure thereof. By configuring the positioning holes in a triangular shape and inserting the positioning shaft 3 into the three positioning holes to connect with the longitudinal arm 12, even if the hitch assembly 2 as a whole has a tendency to twist relative to the longitudinal arm, the three positioning shafts 3 will remain in force against the longitudinal arm 12, thereby being able to avoid the rotating shaft 23 from being in force, and further improving the structural strength of the present towing connection device.

[0067] Further, in some embodiments of the present disclosure, as shown in the figures, the hitch assembly 2 comprises a hitch frame 201 and a hitch head assembly 202 connected together, the hitch frame 201 comprises a main body 2010 and a pair of wings 2011 arranged at both ends of the main body 2010, and a pair of protrusions 23 are arranged on the wings 2011, in the assembled state, the longitudinal arm 12 is arranged between the pair of wings 2011, and the pair of protrusions 23 are slidably arranged in the sliding groove 123. The hitch head assembly 202 is connected to the main body 2010, a pair of first positioning holes 221 and a pair of second positioning holes 222 are respectively arranged in the pair of wings 2011, and the hitch head assembly 202 has at least one hitch head 21. In other suitable embodiments, the hitch assembly 2 can also have other suitable structures, for example, an integrated piece having positioning holes and hitch heads.

[0068] In a specific embodiment, the hitch head assembly 202 further comprises a connecting shaft 24, which can be a cylinder as shown in the figures, and a connecting hole 2012 is arranged in the main body 2010, and the connecting shaft 24 is inserted into the connecting hole 2012 to connect the hitch head assembly 202 to the hitch frame 201.

[0069] Further, in some embodiments of the present disclosure, the hitch head assembly 202 comprises at least one avoiding surface 203, and no hitch head 21 is arranged on the avoiding surface 203; wherein the hitch head assembly 202 is rotatably connected to the hitch frame 201, for example, the cylindrical connecting shaft 24 is rotatably inserted into the connecting hole 2012 to achieve rotatable fitting connection. When the hitch assembly 2 is located between the longitudinal arm 12 and the transverse arm 11, the hitch head assembly 202 can be rotated so that the avoiding surface 203 faces the transverse arm 11, thereby avoiding interference between the protruding hitch head 21 and the transverse arm 11 in the storage position, and the overall volume of the hitch assembly 2 is smaller after storage.

[0070] Further, in some embodiments of the present disclosure, a first fixing hole 2001 and a second fixing hole 2002 are arranged in the hitch frame 201, the first fixing hole 2001 and the second fixing hole 2002 are arranged in perpendicular directions, a third fixing hole 2023 is arranged in the hitch head assembly 202, and when the hitch head assembly 202 rotates relative to the hitch frame 201, the third fixing hole 2023 can be rotated to a position aligned with the first fixing hole 2001 and the second fixing hole 2002, respectively. The hitch assembly further comprises a positioning pin 4, which is configured to be inserted into the aligned third fixing hole 2023 and the first fixing hole 2001 and the third fixing hole 2023 and the second fixing hole 2002. Through the above configuration, the hitch head assembly 202 in the storage position and the use position is respectively fixed by the positioning pin 4.

[0071] Further, in some embodiments of the present disclosure, as shown in Figure 8 When the towing assembly 2 between the longitudinal arm 12 and the transverse arm 11 is rotated to the avoidance surface 203 in the towing head assembly 202 facing the longitudinal arm 12, the third fixing hole 2023 is aligned with the first fixing hole 2001, and the extension direction of the aligned third fixing hole 2023 and the first fixing hole 2001 is parallel to the extension direction 120a of the longitudinal arm 12; wherein when the towing assembly is fixed in the storage position, the first distance H between the retainer 201 and the transverse arm 11 can be regarded as the maximum distance between the retainer 201 and the transverse arm 11, and the length of the positioning pin 4 is configured to be greater than the first distance H, so that the positioning pin 4 cannot be pulled out in the storage state and the towing head assembly 202 is separately disassembled, thereby improving the anti-theft performance of the present towing connection device.

[0072] In some specific embodiments, the towing head assembly 202 is a ball head assembly, such as a three-ball head or a double-ball head assembly, and the towing head 21 is a ball head.

[0073] In one specific embodiment, the positioning unit includes at least two pins, and the pins provide the positioning portion 30. In some other suitable embodiments, the positioning unit can be a U-shaped lock having other suitable configurations, such as providing a positioning portion 30 that can be used for insertion fitting.

[0074] In the description of the embodiments of the present application, the term "and / or" is only to describe an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone.

[0075] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0076] It should be understood that the "along" a certain direction mentioned in the text means that there is at least a component in the direction, preferably, the included angle with the direction is within 10°, more preferably, the included angle is within 5°.

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A traction connection device, characterized in that: include: Connectivity components, including: a connecting portion, through which the traction connection device is connected to the traction vehicle; and The longitudinal arm comprises a plurality of first positioning grooves and a plurality of second positioning grooves spaced apart along the extending direction of the longitudinal arm, the longitudinal arm having a first side and a second side oppositely disposed, the connecting portion being connected to the longitudinal arm at the first side, the plurality of first positioning grooves being opened at the first side, The plurality of second positioning grooves are provided on the second side; Trailer components, including: at least one towing head, through which the object to be towed is connected to the towing connection device; and a pair of first positioning holes located at a first position; and a pair of second positioning holes located at a second position; and A positioning unit providing at least two positioning portions for connecting the towing assembly to the connecting assembly; In which, when the towing assembly moves along the extension direction of the longitudinal arm, a pair of first positioning holes can be aligned with the first positioning slots at different positions respectively, and after the first positioning holes are aligned with the first positioning slots, a pair of second positioning holes are simultaneously aligned with the corresponding second positioning slots. In the aligned state, the pair of first positioning holes and the first positioning slots define a channel for the positioning part to be inserted; in the aligned state, the pair of second positioning holes and the second positioning slots define a channel for the positioning part to be inserted.

2. The traction connection device according to claim 1, characterized in that The thickness of the longitudinal arm is defined between the first side and the second side of the longitudinal arm, and the depths of the first positioning groove and the second positioning groove are both not less than one quarter of the thickness.

3. The traction connection device according to claim 1, characterized in that: One of the longitudinal arm and the towing assembly is provided with a sliding groove, and the other has a convex portion, and the convex portion is slidably connected with the sliding groove to guide the towing assembly to move along the extension direction of the longitudinal arm.

4. The traction connection device according to claim 3, characterized in that: The connecting assembly is an L-shaped bracket, the connecting portion is a transverse arm extending perpendicularly from the end of the longitudinal arm, and the L-shaped bracket has a space on the first side of the longitudinal arm to accommodate the towing assembly; Wherein, the sliding groove is opened in the longitudinal arm, and the protrusion is a rotating shaft arranged on the towing component.

5. The traction connection device according to claim 4, characterized in that: The towing connection device has a use state and a storage state, the towing assembly is located on the second side of the longitudinal arm in the use state, and is located on the first side of the longitudinal arm in the storage state; Among them, the positioning holes are configured as follows: In use, a pair of the first positioning holes can be moved to align with the first positioning slots at different positions to form a channel, and at the same time, a pair of the second positioning holes can be aligned with the corresponding second positioning slots to form a channel, and the positioning parts are inserted into the channels at the same time, so that the trailer assembly can be fixed to different positions of the longitudinal arm through the positioning unit; The towing assembly is flipped relative to the longitudinal arm to move from the use state to the storage state, wherein in the storage state, a pair of the first positioning holes can be moved to be aligned with at least one of the second positioning grooves to form a channel, and at the same time, a pair of the second positioning holes can be aligned with the corresponding first positioning grooves to form a channel, and the positioning portion is inserted into the channel, so that the towing assembly can be fixed in the storage state by the positioning unit.

6. The traction connection device according to claim 5, characterized in that: The trailer assembly further includes a pair of third positioning holes. In a use state, the third positioning holes are aligned with the remaining first positioning slots or the second positioning slots to form a channel allowing the positioning portion to be inserted; At this time, the first positioning hole, the second positioning hole, and the third positioning hole are distributed in the towing component in a triangle shape, and the rotating shaft is located in the triangle.

7. The traction connection device according to claim 4, characterized in that: The towing assembly includes a holder and a towing head assembly connected to each other, the holder includes a main body and a pair of wing plates, the towing head assembly is connected to the main body, and in an assembled state, the pair of wing plates are located on both sides of the width of the longitudinal arm, and the protrusion is provided on the wing plates; A pair of the first positioning holes and a pair of the second positioning holes are respectively opened in the wing plate, and the towing head assembly has at least one towing head.

8. The traction connection device according to claim 7, characterized in that: The towing head assembly includes at least one avoidance surface, and the towing head is not provided on the avoidance surface; The towing head assembly is rotatably connected to the retaining frame, so that when the towing head assembly is stored, the towing head assembly can be rotated so that the avoidance surface faces the transverse arm.

9. The traction connection device according to claim 8, characterized in that: The retaining frame is provided with a first fixing hole and a second fixing hole, wherein the first fixing hole is perpendicular to the second fixing hole, and the towing head assembly is provided with a third fixing hole, wherein when the towing head assembly rotates relative to the retaining frame, the third fixing hole can be rotated to a position aligned with the first fixing hole and the second fixing hole respectively; The traction connection device further includes a positioning pin configured to be inserted into the aligned third fixing hole and the first fixing hole and the third fixing hole and the second fixing hole.

10. The traction connection device according to claim 9, characterized in that The positioning unit includes at least two pins, and the pins provide the positioning portions.

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