Trailer assembly for mounting to vehicle

Abstract

The utility model discloses a trailer assembly used for being installed on a vehicle, which comprises a main beam, a first connecting rod, a second connecting rod, a first connecting rod and a second connecting rod, a tow hook assembly connected to the main beam; two connection fittings connected to the first end and the second end, respectively, for connecting the trailer assembly to the vehicle; the connecting fitting comprises a connecting support fixed to the main beam and a connecting arm used for being connected with a vehicle, the connecting support comprises a plate-shaped component, the plate-shaped component is provided with a first end face and a second end face opposite to the first end face, and the longitudinal section of the plate-shaped component changes in a stepped mode from the first end face to the second end face. A channel penetrating through the first end face and the second end face is formed in the plate-shaped component, and the connecting arm penetrates through the channel and is connected with the plate-shaped component in a welded mode. The problem that stress concentration is easily caused by connection of components in an existing connecting arm and trailer assembly is solved. Load transmitted by the connecting arm is dispersed through the step structure, and stress concentration of the channel edge and a welding seam is reduced.

Description

TECHNICAL FIELD

[0001] The present utility model relates to a vehicle connection device, in particular to a trailer assembly for mounting to a vehicle. BACKGROUND

[0002] In the application scenario of the automobile trailer hook, the connection structure of the trailer hook and the vehicle body is crucial. The traditional automobile trailer hook connection method mostly adopts a trailer hook U-shaped beam support directly connected with the vehicle body through a connecting arm. However, this connection method has many disadvantages.

[0003] On the one hand, the contact area between the connecting arm and the bottom plate of the U-shaped beam support is small. In actual use, when the automobile drags heavy objects, the limited contact area makes the force not evenly dispersed at the connection part under the condition that the trailer hook bears a large pulling force. The small contact area means that the force per unit area is relatively large, which will accelerate the wear and deformation of the material at the connection part and affect the stability of the connection.

[0004] On the other hand, due to the small contact area, stress concentration phenomenon easily occurs on the bottom plate when the trailer hook drags heavy objects. Stress concentration will cause the local area of the bottom plate to bear excessively high stress, far exceeding the normal allowable stress range of the material. Under the condition of long-term stress concentration, the bottom plate is prone to fatigue cracks, and as the number of uses increases, the cracks will gradually expand, which may eventually lead to the rupture of the bottom plate, seriously affecting the service life and safety of the trailer hook.

[0005] In summary, the existing automobile trailer hook connection structure has obvious deficiencies in the connection design of the connecting arm and the bottom plate, and a new structure is urgently needed to increase the contact area between the connecting arm and the bottom plate, effectively disperse stress, improve the overall performance of the trailer hook connection part, and ensure the safety and reliability of the automobile trailer hook during use. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a trailer assembly for mounting to a vehicle, which can effectively solve the problem of stress concentration caused by the connection of the connecting arm and the U-shaped beam in the existing trailer assembly.

[0007] In order to solve the above technical problems, the utility model is realized by the following technical scheme:

[0008] The trailer assembly for mounting to a vehicle comprises:

[0009] a main beam comprising a first end portion and a second end portion separated by a distance;

[0010] a trailer hook assembly connected to the main beam;

[0011] two connecting fittings respectively connected to the first end portion and the second end portion for connecting the trailer assembly to the vehicle;

[0012] The connecting fitting comprises a connecting bracket fixed to the main beam and a connecting arm for connecting the vehicle, the connecting bracket comprises a plate-shaped member having a first end face and a second end face opposite to the first end face, the longitudinal section of the plate-shaped member changes in steps from the first end face to the second end face, the plate-shaped member is provided with a channel penetrating the first end face and the second end face, and the connecting arm penetrates the channel and is welded to the plate-shaped member.

[0013] In the trailer assembly for mounting to the vehicle, the plate-shaped member comprises a first plate body provided with the first end face and a second plate body provided with the second end face, and the first plate body and the second plate body are fixedly connected in layers, and the length of the first plate body is smaller than the length of the second plate body in the longitudinal section of the plate-shaped member.

[0014] In the trailer assembly for mounting to the vehicle, the peripheral wall of the first plate body is welded to the second plate body.

[0015] In the trailer assembly for mounting to the vehicle, the welding seams of the connecting arm with the first end face and the second end face are arranged in a circumferential direction of the connecting arm.

[0016] In the trailer assembly for mounting to the vehicle, the connecting bracket further comprises a first connecting portion and two second connecting portions fixed to the first connecting portion and arranged at intervals, the plate-shaped member is detachably connected to the first connecting portion, and the two second connecting portions are fixed to the main beam.

[0017] In the trailer assembly for mounting to the vehicle, a notch is formed in the first connecting portion to avoid the connecting arm.

[0018] In the trailer assembly for mounting to the vehicle, at least one fixing plate is fixed to the main beam between the first end portion and the second end portion, and the trailer hook assembly is detachably fixed to the fixing plate.

[0019] In the trailer assembly for mounting to the vehicle, there are two fixing plates arranged at intervals, and the trailer hook assembly is fixed between the two fixing plates.

[0020] In the trailer assembly for mounting to the vehicle, a connecting groove is formed in the fixing plate and matched with the outer surface of the main beam.

[0021] In the trailer assembly for mounting to the vehicle, the trailer hook assembly is mounted to a connecting piece, and the connecting piece is detachably connected to the fixing plate.

[0022] Compared with the prior art, the trailer assembly has the following advantages:

[0023] The utility model discloses a plate -shaped member of longitudinal section from first end face to second end face direction presents the stepped change of board -shaped member, and the stress concentration problem that the current connecting arm is connected with trailer assembly middle part is easy to cause is solved. The plate -shaped member of prior art is even in the thickness of longitudinal section direction, and after the through -hole is set up and is inserted and is welded, stress is easy to concentrate in the edge of through -hole and the junction of weld, and fatigue crack is caused, the utility model discloses through the plate -shaped member is designed into the stepped change along the longitudinal section direction and the channel is set up in the area of the maximum thickness of longitudinal section, and the thickness of the material around the channel is increased, can disperse the load that the connecting arm transmits through the stepped structure, reduces the stress concentration of the edge of channel and weld, and the alternating load is borne in the running of vehicle trailer assembly, and the gradually changing section of stepped structure can buffer impact energy, avoid the brittle fracture of weld caused by stress mutation, can improve the shear and anti -pulling capacity greatly, and the stress of weld is more even under the same load, and it is not easy to take place peeling failure, the gradually changing section of stepped structure can also absorb more welding heat input, slow down the cooling rate, reduce the residual stress level of weld and heat affected zone, reduce the risk of deformation and microcrack. The stepped structure is thickened only in the high stress area around the channel, and is thinned in the low stress area, realizes " material distribution on demand", reduces the weight while guaranteeing the strength.

[0024] Further, the plate-shaped member includes a first plate body provided with the first end face and a second plate body provided with the second end face, the first plate body and the second plate body are fixedly connected in a stacked manner, and on the longitudinal section of the plate-shaped member, the length of the first plate body is less than the length of the second plate body. The first plate body is short and serves as a local reinforcing plate, mainly bearing concentrated loads such as shear force in the welding area after the connecting arm is inserted into the channel, and transferring part of the stress to the second plate body through the fixed connection with the second plate body; the second plate body is long and serves as a main load-bearing plate, dispersing the loads transmitted by the trailer hook and the main beam to a wider area through the extension length, especially uniformly spreading to the vehicle connection point direction, avoiding excessive stress concentration in the channel welding area. The length difference between the first plate body and the second plate body forms a gradual transition, avoiding the sudden rise of stress caused by the sudden change of section in a single plate structure. Since the plate-shaped member adopts a split structure of the first plate body and the second plate body, different designs of different strengths or thicknesses can be made for the different roles of the two plate bodies, and the existing plate-shaped member can also be retrofitted and strengthened.

[0025] Further, the peripheral wall of the first plate body is welded to the second plate body. The welding of the peripheral wall forms a continuous stress transmission ring at the contact interface of the first plate body and the second plate body, uniformly spreading the loads transmitted by the connecting arm to the entire extension area of the second plate body through the welding interface, avoiding local stress concentration.

[0026] Further, the welds of the connecting arm and the first end face and the second end face are arranged in a circumferential manner around the connecting arm. This makes the connecting arm and the plate-shaped member form a more compact overall structure, and the connection is more secure. Compared with non-circumferential welds, the circumferential welds provide continuous and uniform connection force, which can better withstand forces from all directions during towing. During towing, the direction of the vehicle's movement changes constantly, and the direction of the towing force also changes accordingly. The circumferential welds can resist these forces in all directions, effectively preventing problems such as loosening and cracking at the connection site, greatly enhancing the overall connection strength of the towing hook device, and ensuring the safe operation of the towing operation. The circumferentially arranged welds help to evenly distribute stress on the plate-shaped member. When the towing hook is subjected to external forces, stress can be evenly transmitted to the entire structure along the circumferential welds, avoiding stress concentration in local areas. This uniform stress distribution can reduce the risk of material fatigue and fracture due to stress concentration, improving the structural reliability and service life of the towing hook device. If the welds are not circumferentially arranged, stress concentration may occur in some areas, leading to premature damage to these areas. The circumferential welds can effectively prevent this from happening. The circumferential welds completely close the gap between the connecting arm and the channel, preventing the intrusion of water, salt mist, and dust, and reducing the risk of rust.

[0027] Further, the connecting bracket further comprises a first connecting portion and two second connecting portions fixed on the first connecting portion and spaced apart, the plate-shaped member is detachably connected to the first connecting portion, and the two second connecting portions are fixedly connected to the main beam. The two second connecting portions are spaced apart, which can more evenly withstand forces from the main beam and the mounting plate, preventing the connecting bracket from twisting or deforming when subjected to force, thereby ensuring the stable connection between the mounting plate and the main beam. The first connecting portion is detachably connected to the plate-shaped member, and the two second connecting portions are fixedly connected to the main beam, forming a stable connection system. The two second connecting portions are spaced apart, which can more evenly withstand forces from the main beam and the mounting plate, preventing the connecting bracket from twisting or deforming when subjected to force, thereby ensuring the stable connection between the connecting bracket and the main beam. The first connecting portion is detachably connected to the plate-shaped member, which facilitates the selection of different specifications of plate-shaped members for installation according to actual conditions, meeting various use scenarios. The two second connecting portions can be flexibly adjusted according to the structural characteristics and installation position of the main beam, allowing them to adapt to various main beam structures, increasing the versatility of the towing hook device and expanding its application range.

[0028] Further, the first connecting part is provided with a notch for avoiding the connecting arm. The interference between the connecting bracket and the connecting arm is effectively avoided. During the operation of the trailer hook device, the connecting arm may be displaced or vibrated to a certain extent. If the first connecting part is not provided with a notch, the connecting arm is likely to collide or rub against the first connecting part, which not only affects the normal operation of the connecting arm, but also causes damage to the connecting bracket or the connecting arm. After the notch is provided, the connecting arm has sufficient space for movement, the mutual interference between the components is reduced, the components of the trailer hook device can stably operate in cooperation, and the service life of the entire device is prolonged. Moreover, the notch facilitates the fixing of the plate-shaped member and the connecting arm, and the fixed connection between the plate-shaped member and the first connecting part.

[0029] Further, at least one fixing plate is fixed on the main beam between the first end and the second end, and the trailer hook assembly is detachably fixed on the fixing plate. This design makes the operation more convenient and fast when the trailer hook is installed. The installer can successfully complete the installation of the trailer hook without complicated procedures. When the trailer hook needs to be disassembled for maintenance or replacement, the trailer hook assembly only needs to be simply disassembled from the fixing plate, without the need to disassemble the entire trailer assembly, which greatly saves the time and labor cost required for installation and disassembly, and improves the work efficiency. The existing integral structure is prone to stress concentration due to the continuity of the structure when stressed. The above structure design effectively avoids this problem. The components in the device are relatively independent and work in cooperation. When the trailer hook is subjected to external force, the stress is dispersed and transmitted through the main beam, the fixing plate and other components, and is not excessively concentrated in a certain position.

[0030] Further, the fixing plates are two and are spaced apart, and the trailer hook assembly is fixed between the two fixing plates. The two spaced-apart fixing plates cooperate with the connecting piece to form a stable clamping structure. This structure can effectively limit the movement of the connecting piece in various directions, preventing it from shaking, shifting, and other situations. During towing, factors such as vibrations generated during vehicle travel and changes in towing force can affect the stability of the trailer hook device. The design of the two fixing plates can better resist these external forces, ensuring that the connecting piece always remains in the correct position, thereby enhancing the stability of the entire trailer hook device and ensuring the safe operation of the towing operation. The two fixing plates are spaced apart, allowing the connecting piece to more evenly distribute force to the fixing plates when under stress. When the trailer hook is subjected to a towing force, the connecting piece disperses the force to the two fixing plates, preventing a single fixing plate from bearing too much force, thereby optimizing the force distribution of the entire structure. This even force distribution can reduce the risk of damage to the fixing plates and trailer hook assembly due to excessive local stress, extending the service life of the trailer hook device and improving its reliability. The two spaced-apart fixing plates provide clear positioning and support for the installation of the trailer hook assembly. When installing the connecting piece, it only needs to be fixed between the two fixing plates, eliminating the need for complex positioning operations, reducing installation difficulty, and improving installation efficiency. At the same time, this design also facilitates the adjustment and fixation of the trailer hook assembly during installation, ensuring its installation precision and further enhancing the convenience of trailer hook installation.

[0031] Further, the fixing plates have connecting grooves on their surfaces that match the outer surface of the main beam. The connecting grooves geometrically match the outer surface of the main beam, forming a full-wrapped contact that significantly increases the contact area between the fixing plates and the main beam, thereby dispersing the concentrated load transmitted by the trailer hook assembly and reducing local pressure. The adaptive connecting grooves allow the load to be continuously transmitted along the outer surface of the main beam, avoiding stress concentration around traditional bolt holes. The pre-designed shape of the connecting grooves matches the outer contour of the main beam, allowing the fixing plates to be directly "clamped" into the main beam without the need for repeated position adjustments, saving installation time.

[0032] Further, the trailer hook assembly is installed on the connecting piece, and the connecting piece is detachably connected to the fixing plate. The connecting piece serves as an intermediary between the trailer hook and the fixing plate, evenly distributing the concentrated load to the fixing plate through geometric design, reducing stress peaks. The connecting piece can also be designed to have a certain rotational angle, allowing the trailer hook assembly and the cross beam to not necessarily be in a parallel position, thereby increasing design flexibility and facilitating the trailer hook assembly to adapt to different towing needs. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A perspective view of the utility model for installing a trailer assembly to a vehicle;

[0034] Figure 2is an exploded view of the connection arm and the connection support in the utility model;

[0035] Figure 3 is Figure 2 an exploded view;

[0036] Figure 4 is a sectional view of the connection arm and the connection support in the utility model.

[0037] Figure 5 is an exploded view of the connection arm and the connection support in the utility model.

[0038] Figure 6 is a sectional view of the connection arm and the connection support in the utility model.

[0039] Reference signs are:

[0040] The main beam 10, the first end portion 11, the second end portion 12, the trailer hook assembly 20, the connecting fitting 30, the connection support 31, the plate-shaped member 311, the first end face 3111, the second end face 3112, the passage 3113, the first plate body 3114, the second plate body 3115, the weld 312, the first connecting portion 313, the notch 3131, the second connecting portion 314, the connection arm 32, the fixing plate 40, the connecting groove 41, the connecting piece 50, the connecting hole 51, and the fixing hole 52. DETAILED DESCRIPTION

[0041] A trailer assembly for mounting to a vehicle, comprising:

[0042] A main beam 10 comprising a first end portion 11 and a second end portion 12 spaced apart;

[0043] A trailer hook assembly 20 connected to the main beam 10;

[0044] Two connecting fittings 30 connected to the first end portion 11 and the second end portion 12 respectively for connecting the trailer assembly to the vehicle;

[0045] The connecting fitting 30 comprises a connection support 31 fixed to the main beam 10 and a connection arm 32 for connecting the vehicle, the connection support 31 comprises a plate-shaped member 311, the plate-shaped member 311 has a first end face 3111 and a second end face 3112 opposite to the first end face 3111, the longitudinal section of the plate-shaped member 311 changes in steps from the first end face 3111 to the second end face 3112, the plate-shaped member 311 is provided with a passage 3113 penetrating through the first end face 3111 and the second end face 3112, and the connection arm 32 penetrates through the passage 3113 and is welded to the plate-shaped member 311.

[0046] By setting the plate-shaped member 311 with the stepped change in the longitudinal section from the first end surface 3111 to the second end surface 3112 direction, the problem that the stress is easily concentrated when the connecting arm 32 is connected with the middle part of the trailer assembly is solved. The plate-shaped member 311 of the prior art is uniform in thickness in the longitudinal section direction, and after the through hole is inserted and welded with the connecting arm 32, the stress is easily concentrated at the junction of the edge of the through hole and the weld 312, and fatigue cracks are caused. The plate-shaped member 311 is designed to be stepped in the longitudinal section direction and the channel 3113 is arranged in the area with the maximum thickness in the longitudinal section, so that the thickness of the material around the channel 3113 is increased, the load transmitted by the connecting arm 32 can be dispersed through the stepped structure, and the stress concentration of the edge of the channel 3113 and the weld 312 is reduced. The vehicle trailer assembly bears alternating loads during driving, the gradually changing cross section of the stepped structure can buffer impact energy, avoid brittle fracture of the weld 312 caused by stress mutation, and can greatly improve the shear resistance and pull-out resistance, the stress on the weld 312 is more uniform under the same load, and the peeling failure is not easy to occur. The gradually changing cross section of the stepped structure can also absorb more welding heat input, slow down the cooling rate, reduce the residual stress level of the weld 312 and the heat affected zone, and reduce the risk of deformation and micro-cracks. The stepped structure is thickened only in the high stress area around the channel 3113, and is thinned in the low stress area, so that the material is distributed according to the need, the strength is ensured, and the weight is reduced.

[0047] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0048] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0049] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0050] In the utility model, unless another definite provision and limitation, the term "installation", "connection", "connect", "fix" and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or become integral; can be mechanical connection, also can be electric connection or each other can communicate; can be direct connection, also can pass through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation. For ordinary skilled person in the art, can understand the above-mentioned term in the utility model's concrete meaning according to specific situation.

[0051] Referring to Figure 1 For the embodiment of the utility model for installing to the trailer assembly of vehicle, the trailer assembly for installing to the vehicle includes main beam 10, trailer hook assembly 20 and two connecting fittings 30, the main beam 10 is long strip rod shape, and is curved according to the design requirement of vehicle, the trailer hook assembly 20 is generally fixed in the middle part of main beam 10, and the two ends of main beam 10 are first end 11 and second end 12 respectively, and one connecting fitting 30 is assembled on first end 11 and second end 12 respectively, and main beam 10 is fixed on the body of vehicle through connecting fitting 30. The utility model mainly optimizes the structure of connecting fitting 30, the connecting structure of trailer hook assembly 20 and main beam 10, and reduces the problem of stress concentration.

[0052] As Figure 2 , Figure 3 , Figure 6 As shown in the embodiment, connecting fitting 30 includes connecting bracket 31 fixed to main beam 10 and connecting arm 32 for connecting vehicle, and connecting arm 32 is columnar structure with rectangular cross section, one end of connecting arm 32 is fixedly connected with the body of vehicle, and the other end of connecting arm 32 is fixedly connected with connecting bracket 31, and connecting bracket 31 includes plate-shaped member 311. In the prior art, plate-shaped member 311 is flat plate, and channel 3113 is formed in plate-shaped member 311, and connecting arm 32 is inserted into channel 3113 and fixedly connected with plate-shaped member 311 by welding, and this design can cause stress concentration of connecting part when dragging heavy objects, thereby affecting service life and safety.

[0053] Therefore, the longitudinal section of the plate-shaped member 311 in this embodiment is stepped, the longitudinal section is a section parallel to the direction in which the connecting arm 32 is inserted into the connecting bracket 31, and the channel 3113 is arranged in the region of the largest dimension of the longitudinal section, so as to maximize the length of the channel 3113, and the connecting arm 32 penetrates through the channel 3113 and is welded with the plate-shaped member 311. The thickness of the material around the channel 3113 is increased, which can disperse the load transmitted by the connecting arm 32 through the stepped structure and reduce the stress concentration of the edge of the channel 3113 and the weld 312; the vehicle trailer assembly bears alternating loads during driving, and the gradually changing section of the stepped structure can buffer impact energy and avoid brittle fracture of the weld 312 caused by sudden stress, which can greatly improve the shear resistance and pull-out resistance, the stress on the weld 312 is more uniform under the same load, and the peel-off failure is less likely to occur; the thickened material in the region of the largest dimension can also absorb more welding heat input, slow down the cooling rate, reduce the residual stress level of the weld 312 and the heat-affected zone, and reduce the risk of deformation and micro-cracks. The stepped structure is thickened only in the high-stress region around the channel 3113, and is thinned in the low-stress region, so as to realize “material distribution on demand”, which can ensure the strength while reducing the weight.

[0054] Further, in order to realize the stepped change of the longitudinal section of the plate-shaped member 311, the plate-shaped member 311 can be an integral body or can be stacked by a plurality of plate bodies, and in this embodiment, the plate-shaped member 311 is formed by stacking the first plate body 3114 and the second plate body 3115, which facilitates the modification of the existing plate-shaped member 311 and can freely match the thickness and material of the first plate body 3114 and the second plate body 3115 according to the actual design requirements, and has great flexibility. Specifically, the plate-shaped member 311 includes the first plate body 3114 provided with the first end face 3111 and the second plate body 3115 provided with the second end face 3112, the first plate body 3114 and the second plate body 3115 are fixedly connected in layers, and in the longitudinal section, the length of the first plate body 3114 is less than that of the second plate body 3115, and in this embodiment, the first plate body 3114 with a smaller length is located above the second plate body 3115 with a larger length, so that the longitudinal section of the plate body member has an upper small and lower large shape. The first plate body 3114 is short and serves as a local reinforcing plate, mainly bears the concentrated load such as shear force in the welding area after the connecting arm 32 is inserted into the channel 3113, and transfers part of the stress to the second plate body 3115 through the fixed connection with the second plate body 3115; the second plate body 3115 is long and serves as a main bearing plate, which disperses the load transmitted by the trailer hook and the main beam 10 to a wider area through the extended length, especially uniformly diffuses to the vehicle connection point direction, so as to avoid excessive stress concentration in the welding area of the channel 3113.

[0055] Further, the peripheral wall of the first plate body 3114 is fixedly connected with the second plate body 3115 by welding to ensure the stability of the connection between the two, and the stress of the first plate body 3114 can also be uniformly transmitted to the second plate body 3115. The first plate body 3114 can be welded along the peripheral wall of the first plate body 3114 and the second plate body 3115, or the peripheral wall of the first plate body 3114 can be aligned with the peripheral wall of the second plate body 3115, and the remaining peripheral wall of the first plate body 3114 can be welded with the second plate body 3115. The welding is continuous, so that the contact interface between the first plate body 3114 and the second plate body 3115 forms a continuous stress transmission ring, and the load transmitted by the connecting arm 32 is uniformly diffused to the entire extension area of the second plate body 3115 through the welding interface, avoiding local stress concentration.

[0056] The welding seams 312 of the connecting arm 32 and the first end face 3111 and the second end face 3112 are arranged along the circumference of the connecting arm 32, and form a complete stress ring in the circumference of the connecting arm 32, which uniformly disperses the drag stress to the entire welding seam 312 area, avoiding local stress concentration, and the continuous welding seam 312 in the circumference provides 360° symmetrical support, eliminating the problem of stress imbalance caused by unilateral welding. The circumferential continuous welding seam 312 can eliminate the weak area between the welding points, reduce the risk of crack initiation under dynamic load, and the continuous welding seam 312 makes the second plate body 3115 and the first plate body 3114 and the connecting arm 32 form an integrated structure, improving the anti-torsion and anti-shear ability.

[0057] In order to reduce the assembly difficulty and the replacement cost after damage, the connecting arm 32 and the main beam 10 are in a detachable fixed connection relationship. In order to achieve the above purpose, the connecting bracket 31 further comprises a first connecting portion 313 and two second connecting portions 314 fixedly arranged on the first connecting portion 313, and the plate-shaped member 311 is detachably connected to the first connecting portion 313, and the two second connecting portions 314 are fixedly connected with the main beam 10. The second plate body 3115 and the first connecting portion 313 can be detachably connected by means of bolt connection, and the above scheme can match main beams 10 of different specifications and installation angles by replacing the bracket, without redesigning the structure of the second plate body 3115 and the connecting arm 32.

[0058] Further, in the present embodiment, the first connecting portion 313 and the two second connecting portions 314 form a U-shaped structure in cross section, at least two connecting holes are provided on the second plate body 3115 and the first connecting portion 313, and the second plate body 3115 and the first connecting portion 313 are detachably connected by bolts passing through the connecting holes, so as to facilitate assembly and replacement, and the stress of the second plate body 3115 and the first connecting portion 313 can be uniformly transmitted, and such detachable connection can form a slight gap between the other side of the second plate body 3115 and the first connecting portion 313, reducing the direct impact on the main beam 10. The two spaced second connecting portions 314 uniformly disperse the drag force to multiple fixed points of the main beam 10, forming a symmetrical stress path and improving the torsional resistance.

[0059] Since the plate-shaped member 311 is sleeved on the connecting arm 32, that is, the connecting arm 32 penetrates the plate-shaped member 311, and the second plate body 3115 of the plate-shaped member 311 is further connected with the first connecting portion 313, in order to avoid interference of the connecting arm 32 with the connection of the second plate body 3115 and the first connecting portion 313, a notch 3131 is provided on the first connecting portion 313 to avoid the connecting arm 32, and the size and shape of the notch 3131 can be designed according to the connection degree of the connecting arm 32 and the first connecting portion 313. The notch 3131 not only facilitates the installation of the connecting bracket 31 after the connecting arm 32 and the second plate body 3115 are welded into an integral whole, but also avoids the connecting bracket 31 from colliding or rubbing directly with the connecting arm 32 when the trailer hook device is working, and the connecting arm 32 has sufficient space for movement, reducing the mutual interference between the components and ensuring that the components of the trailer hook device can operate stably and cooperatively, thereby prolonging the service life of the entire device.

[0060] For the connection of the trailer hook assembly 20 and the main beam 10, in the past, the trailer hook assembly 20 is directly welded on the main beam 10, which is very inconvenient for installation, disassembly and maintenance, and stress concentration may occur due to the continuity of the structure when stressed, affecting the service life and safety. In order to solve the above problems, as shown in Figure 4 , Figure 5 The main beam 10 is fixed with a fixed plate 40, and the trailer hook assembly 20 is installed on a connecting piece 50, and the connecting piece 50 is detachably connected with the fixed plate 40, so that the trailer hook assembly 20 can be conveniently disassembled and maintained, different specifications of the trailer hook assembly 20 can be replaced as needed, and the thickness of each component can be optimized according to design needs to avoid redundant material accumulation. Since the fixed plate 40 and the connecting piece 50 are detachably connected, the components are relatively independent and work cooperatively, and when the trailer hook is subjected to external force, the stress is dispersed and transmitted through the main beam 10, the fixed plate 40, the connecting piece 50 and other components, and is not excessively concentrated in a certain position.

[0061] Further, the fixing plates 40 are two and are arranged at intervals, the connecting piece 50 is fixed between the two fixing plates 40, the two fixing plates 40 are beneficial to disperse stress, and a stable frame structure is formed, the torsion resistance is improved, the fixing of the connecting piece 50 and the double fixing plates 40 forms a closed bearing structure, and the overall rigidity is improved. Specifically, the fixing plates 40 can be provided with connecting grooves 41 matched with the main beam 10, the contact area of the fixing plates 40 and the main beam 10 is increased, the fixing plates 40 can be fixedly connected with the main beam 10 in a welding mode, and the fixing plates 40 can be provided with connecting holes, and the connecting piece 50 is also provided with connecting holes 51, the connecting piece 50 and the fixing plates 40 are fixedly connected through bolts penetrating through the connecting holes of the fixing plates 40 and the connecting piece 50.

[0062] For the connection of the connecting piece 50 and the trailer hook assembly 20, the connecting piece 50 can be provided with fixing holes 52, the trailer hook assembly 20 penetrates through the fixing holes 52 and is fixedly connected with the connecting piece 50, the connecting piece 50 can be designed in different structural shapes according to the positional relationship between the trailer hook assembly 20 and the main beam 10, so that the trailer hook assembly 20 works in a predetermined working state, the connecting piece 50 and the trailer hook assembly 20 can be mass-produced in a modularized mode, the single cost is reduced, the size of the fixing holes can be designed in a standardized mode, different models of the trailer hook assembly 20 are matched, and the modification cost of new vehicle models is reduced.

[0063] Through the above structure, the automobile trailer hook device realizes a multi-part detachable connection structure, when part of the components are damaged, the replacement and maintenance cost can be reduced, and the first plate body 3114 is added, the plate-shaped member 311 is designed to change in steps along the longitudinal section direction, and the channel 3113 is arranged in the area with the maximum longitudinal section thickness, the material thickness around the channel 3113 is increased, the load transmitted by the connecting arm 32 can be dispersed through the stepped structure, and the stress concentration of the edge of the channel 3113 and the weld 312 is reduced; the vehicle trailer assembly bears alternating loads during driving, the gradually changing section of the stepped structure can buffer impact energy, and brittle fracture of the weld 312 caused by sudden stress change is avoided. A detachable connection mode is also adopted at the connection between the trailer hook assembly 20 and the main beam 10, the firm connection of the trailer hook assembly 20 and the main beam 10 is ensured, different sizes of the trailer hook assembly 20 can be conveniently replaced according to needs, when the trailer hook is subjected to external force, stress can be dispersed and transmitted through the main beam 10, the fixing plate 40 and the connecting piece 50, and will not be excessively concentrated in a certain position.

[0064] The above merely describes specific embodiments of the present application, but the technical features of the present application are not limited to this, any person skilled in the art can make changes or modifications in the field of the present application, and the changes or modifications are covered in the patent range of the present application.

Claims

1. A trailer assembly for mounting to a vehicle, characterised in that, The utility model relates to a trailer hitch assembly, comprising: a main beam comprising a first end portion and a second end portion spaced apart; a trailer hitch assembly connected to the main beam; two connecting fittings connected to the first end portion and the second end portion respectively for connecting the trailer assembly to a vehicle; the connecting fitting comprises a connecting bracket fixed to the main beam and a connecting arm for connecting the vehicle, the connecting bracket comprises a plate-shaped member having a first end face and a second end face opposite to the first end face, the longitudinal section of the plate-shaped member changes in steps from the first end face to the second end face, the plate-shaped member is provided with a passage penetrating through the first end face and the second end face, and the connecting arm penetrates through the passage and is welded to the plate-shaped member.

2. The trailer assembly for mounting to a vehicle of claim 1, wherein, the plate-shaped member comprises a first plate body provided with the first end face and a second plate body provided with the second end face, and the first plate body and the second plate body are fixedly connected in layers, and the length of the first plate body is smaller than that of the second plate body in the longitudinal section of the plate-shaped member.

3. The trailer assembly for mounting to a vehicle of claim 2, wherein, the peripheral wall of the first plate body is welded to the second plate body.

4. The trailer assembly for mounting to a vehicle of claim 1, wherein, the welds of the connecting arm with the first end face and the second end face are arranged circumferentially around the connecting arm.

5. The trailer assembly for mounting to a vehicle of claim 1, wherein, the connecting bracket further comprises a first connecting portion and two second connecting portions fixed to the first connecting portion and spaced apart, the plate-shaped member is detachably connected to the first connecting portion, and the two second connecting portions are fixedly connected to the main beam.

6. The trailer assembly for mounting to a vehicle of claim 5, wherein, a notch is formed in the first connecting portion to avoid the connecting arm.

7. The trailer assembly for mounting to a vehicle of claim 1, wherein, at least one fixing plate is fixed to the main beam between the first end portion and the second end portion, and the trailer hitch assembly is detachably fixed to the fixing plate.

8. The trailer assembly for mounting to a vehicle of claim 7, wherein, there are two fixing plates spaced apart, and the trailer hitch assembly is fixed between the two fixing plates.

9. The trailer assembly for mounting to a vehicle of claim 7, wherein, a connecting groove is formed in the fixing plate to match the outer surface of the main beam.

10. The trailer assembly for mounting to a vehicle of claim 7, wherein, the trailer hitch assembly is mounted on a connecting piece which is detachably connected to the fixing plate.

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