Device for connecting trailer load and trailer hook ball head

Abstract

The utility model discloses a device for connecting a trailer load and a trailer hook ball head, which comprises a base connected to the trailer load; the clamping mechanism is used for clamping the tow hook ball head, the clamping mechanism comprises two clamping components, and at least one clamping component is pivoted to the base; clamping curved surfaces matched with the surface of the tow hook ball head are arranged on the opposite inner walls of the two clamping components, and when the two clamping components are closed, the clamping curved surfaces jointly form an openable space used for receiving the tow hook ball head; a concave avoiding area is arranged in the clamping curved surface, and a gap is formed between the concave avoiding area and the outline of the corresponding tow hook ball head. The tow hook ball head connector has the advantage that the problem that a ball head of an existing tow hook ball head connector is prone to shaking in the dragging process is solved. The transverse swing resistance is remarkably improved, the connection between the connecting ball head and the connector body is more stable, the connecting ball head and the connector body are not prone to shaking in the dragging process, local stress concentration caused by rigid constraint is avoided, and the fracture risk is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle connecting device, concretely relates to the device for trailer load and trailer hook ball head connection. BACKGROUND

[0002] Some equipment of prior art such as house car, yacht and drag bucket etc. need to be connected to the power car rear tow by ball head connecting piece. The ball head is assembled at the tail of the vehicle, and the connector is arranged on the drag bucket and connected with the ball head. The commonly used ball head connector structure is disclosed in Chinese patent publication No. CN221913951U, named "a trailer tail trailer clamp ball connector", which is provided with a movable clamp ball block and a fixed clamp ball block in the base. A pair of inner walls opposite to the movable clamp ball block and the fixed clamp ball block are provided with a hemispherical inner groove matched with the clamp ball for clamping. In the actual use process, when the movable clamp ball block and the fixed clamp ball block clamp the clamp ball, the two hemispherical inner grooves will be tightly clamped with the clamp ball, and the force of the movable clamp ball block and the fixed clamp ball block to the clamp ball is concentrated to the equator of the clamp ball, causing unstable clamping of the clamp ball, and shaking in the towing process. UTILITY MODEL CONTENT

[0003] The utility model aims at providing a device for connecting trailer load and trailer hook ball head, which can effectively solve the problem of ball head shaking in the existing trailer hook ball head connector in the towing process.

[0004] In order to solve the above technical problem, the utility model is realized by the following technical scheme:

[0005] The device for connecting trailer load and trailer hook ball head comprises:

[0006] a base connected to the trailer load; and

[0007] a clamping mechanism for clamping the trailer hook ball head, which comprises two clamping members, and at least one clamping member is pivoted to the base;

[0008] The inner walls opposite to the two clamping members are each provided with a clamping curved surface matched with the surface of the trailer hook ball head. When the two clamping members are closed, the clamping curved surfaces jointly form an openable and closable space for receiving the trailer hook ball head. The clamping curved surface is provided with a recessed avoidance area, and the recessed avoidance area and the corresponding trailer hook ball head profile form a gap.

[0009] In the device for connecting the trailer load and the trailer hook ball head described above, the cross section of the recessed avoidance area is arc-shaped or rectangular. The structure with an arc-shaped cross section matches the natural curvature of the surface of the trailer hook ball head, reduces the difficulty of numerical control machining, smoothly transitions the contact surface with the trailer hook ball head, reduces the risk of micro-crack initiation, improves the fatigue life of the component, and the stress dispersion effect of the arc-shaped cross section is significant: when the arc-shaped cross section is in contact with the surface of the trailer hook ball head, the local load can be dispersed along the tangent direction, avoiding stress concentration and causing the clamp block to break; and the cross section of the recessed avoidance area is set to a rectangular surface, which is equivalent to designing a straight groove, which can be quickly formed by conventional milling or wire cutting, reducing the requirement for precision machining.

[0010] In the device for connecting the trailer load and the trailer hook ball head described above, the recessed avoidance area is a ring-shaped avoidance groove, and the avoidance groove is provided with a through hole which is the same as the through hole in the outer part. Because the recessed avoidance area is a ring-shaped avoidance groove with a central hole, it can better avoid the corresponding profile of the trailer hook ball head, has a larger avoidance space, and can also adapt to different sizes of trailer hook ball heads. When the openable and closable space is closed, the air between the avoidance groove and the trailer hook ball head can be discharged through the through hole in the avoidance groove, so that the two clamping members can be smoothly closed.

[0011] In the device for connecting the trailer load and the trailer hook ball head described above, the recessed avoidance areas on the two clamping curved surfaces correspond to the profiles at both ends of the diameter of the trailer hook ball head. Since the ends of the diameter of the ball head do not contact the clamping curved surface, the flexibility of the connection is increased to some extent. When the vehicle is jolted or turned during driving, the trailer hook ball head can have a small activity space within the range allowed by the recessed avoidance area, avoiding excessive stress caused by rigid contact. This flexibility helps to buffer the impact force on the ball head, reduces damage to the trailer load and the trailer hook, and also allows the connecting device to better adapt to different driving conditions, improving the stability of the entire trailer system.

[0012] In the device for connecting the trailer load and the trailer hook ball head described above, the clamping curved surface of the pivotable clamping member is further provided with an avoidance structure, which is arranged opposite the opening of the openable and closable space. When the opening of the openable and closable space is opened, the avoidance structure is configured to prevent the pivotable clamping member from interfering with the trailer hook ball head in the disengaged state. The avoidance structure can prevent the pivotable clamping member from abutting against the trailer hook ball head when the movable clamp block is opened, causing the trailer hook ball head to be stuck and unable to exit the openable and closable space.

[0013] In the device for connecting the trailer load and the trailer hook ball head, the avoiding structure is a concave cavity which is concave inwardly to the openable and closable space. During the opening of the pivotable clamping member, even if the trailer hook ball head shakes or deviates to a certain extent, the concave cavity can effectively accommodate the ball head, further reducing the risk of interference and jamming, ensuring the smooth opening of the movable clamping block, and ensuring the safety and reliability of the trailer hook ball head connector during use.

[0014] In the device for connecting the trailer load and the trailer hook ball head, the pivotable clamping member is provided with a pushing member for rotating the pivotable clamping member. When the trailer hook ball head enters the openable and closable space, the pushing member is located in front of the trailer hook ball head entering the openable and closable space. The distance between the pushing member and the trailer hook ball head is less than the distance between the pivotable clamping member in front of the trailer hook ball head entering the openable and closable space and the trailer hook ball head. The pushing member plays a role of pre-positioning and buffering. On the one hand, when the trailer hook ball head is inserted into the openable and closable space, the pivotable clamping member can be rotated in the clamping direction to achieve pre-positioning, guiding the trailer hook ball head to accurately enter the openable and closable space. On the other hand, when the trailer hook ball head is inserted into the openable and closable space, the trailer hook ball head can consume part of the kinetic energy through the pushing member, avoiding direct collision between the trailer hook ball head and the pivotable clamping member, improving the convenience and accuracy of the trailer hook ball head installation, and prolonging the service life of the entire device.

[0015] In the device for connecting the trailer load and the trailer hook ball head, when the openable and closable space is in a closed state, an avoiding gap is provided between the pushing member and the trailer hook ball head to avoid the pivotable clamping member and the trailer hook ball head from being jammed when the openable and closable space is opened. The avoiding gap avoids the pushing member and the trailer hook ball head from being in contact when the pivotable clamping member rotates from the closed position to the open position, causing the trailer hook ball head to be jammed, ensuring that the pivotable clamping member can be smoothly opened to allow the trailer hook ball head to exit the openable and closable space.

[0016] In the device for connecting the trailer load and the trailer hook ball head, the pushing member is detachably fixed on the pivotable clamping member. Since the pushing member needs to withstand the impact of the trailer hook ball head during clamping, the detachable structure facilitates timely replacement of the pushing member after damage.

[0017] In the device for connecting the trailer load and the trailer hook ball head, an elastic driving member is provided in the base, and the elastic driving member is in contact with the pivotable clamping member to drive the two clamping members to rotate away from each other. When unlocked, the elastic driving member can automatically help the pivotable clamping member to open the openable and closable space, without the need for additional complex operations, improving the convenience and efficiency of the unlocking operation, and also allowing the pivotable clamping member to remain in a stable open position in a non-working state, facilitating next use, and enhancing the practicality of the device.

[0018] Compared with the prior art, the utility model has the advantages of

[0019] The concave avoiding area and the gap between the concave avoiding area and the contour of the trailer hook ball head are formed in the clamping curved surface, the problem that the ball head shakes in the towing process is solved, a clamping curved surface that is matched with the surface of the trailer hook ball head is arranged on the opposite inner walls of the two clamping members, and a space that can be opened and closed is formed when the two clamping members are closed, the design can make the clamping force more evenly distributed on the surface of the ball head, compared with the traditional simple clamping mode, the ball head shape can be better fitted, local stress concentration is reduced, and the stability of connection is improved.

[0020] The existence of the gap between the surface of the trailer hook ball head and the concave avoiding area allows the clamping block to compensate for small assembly errors through local deformation, avoids clamping failure caused by hard interference, and improves the reliability under complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A perspective view of the device for connecting the trailer load and the trailer hook ball head of the utility model is shown in the application;

[0022] Figure 2 A front view of the device for connecting the trailer load and the trailer hook ball head of the utility model in the locked state is shown in the application;

[0023] Figure 3 A front view of the device for connecting the trailer load and the trailer hook ball head of the utility model in the unlocked state is shown in the application;

[0024] Figure 4 A Figure 2 A-A sectional view of the utility model;

[0025] Figure 5 A perspective view of the device for connecting the trailer load and the trailer hook ball head of the utility model in the locked state is shown in the application;

[0026] Figure 6 For Figure 3 B-B cross-sectional view in the middle;

[0027] Figure 7 The utility model is a schematic view for the device for connecting the trailer load and the trailer hook ball head from the locking state to the unlocking state;

[0028] Figure 8 The utility model is an explosion view of the device for connecting the trailer load and the trailer hook ball head;

[0029] Figure 9 The utility model is a structure schematic view of the locking member in the utility model;

[0030] Figure 10 The utility model is a structure schematic view when the trailer hook ball head enters the openable and closable space in the utility model;

[0031] Figure 11 The utility model is a structure schematic view when the movable clamp block and the fixed clamp block clamp the trailer hook ball head in the utility model;

[0032] Figure 12 The utility model is a perspective view of the movable clamp block in the utility model;

[0033] Figure 13 The utility model is a perspective view of the fixed clamp block in the utility model.

[0034] The reference signs are:

[0035] The device body 100, the base 110, the limiting surface 111, the movable clamp block 120, the clamping curved surface 121, the pusher 123, the avoiding gap 1231, the abutting surface 124, the guide surface 125, the pivot 126, the recessed avoiding area 127, the free end 128, the pivoting end 129, the avoiding structure 1291, the fixed clamp block 130, the locking member 140, the stopper 141, the limiting part 142, the locking surface 143, the guide surface 144, the rotating handle 150, the operating handle 151, the stopper groove 152, the elastic driving part 160, the adjusting seat 170, the adjusting bolt 171, the trailer hook ball head 200, the handle lock assembly 300, the lock tongue 310, the vehicle frame 400. DETAILED DESCRIPTION

[0036] The device for connecting the trailer load with the trailer hook ball head 200 comprises a base 110 connected to the trailer load, and a clamping mechanism for clamping the trailer hook ball head 200, the clamping mechanism comprising two clamping members, at least one clamping member being pivotally connected to the base 110; the two clamping members are provided with clamping curved surfaces 121 on the opposite inner walls thereof, which are adapted to the surface of the trailer hook ball head 200, and when the two clamping members are closed, the clamping curved surfaces 121 jointly form an openable and closable space for receiving the trailer hook ball head 200; and the clamping curved surfaces 121 are provided with recessed avoiding areas 127, and a gap is formed between the recessed avoiding areas 127 and the contour of the corresponding trailer hook ball head 200.

[0037] The recessed avoiding areas 127 are provided in the clamping curved surfaces 121, and a gap is formed between the recessed avoiding areas 127 and the contour of the corresponding trailer hook ball head 200, thereby solving the problem that the ball head is prone to shaking during the towing process. The clamping curved surfaces 121 are provided on the opposite inner walls of the two clamping members and are adapted to the surface of the trailer hook ball head 200, and when the two clamping members are closed, an openable and closable space is formed, which can make the clamping force more evenly distributed on the surface of the ball head, can better fit the shape of the ball head compared with the traditional simple clamping mode, can reduce local stress concentration, and can improve the stability of the connection. By providing the recessed avoiding areas 127 in the clamping curved surfaces 121, a specific contact area and a gap area are formed, and active regulation of the clamping force distribution is realized: the two clamping members form a mechanical model similar to “two-point clamping”, which significantly improves the ability to resist lateral shaking, makes the connection between the trailer hook ball head 200 and the connector body more stable, and is not prone to shaking during the towing process. The gap of the recessed avoiding areas 127 also allows the trailer hook ball head 200 to produce limited micro-deformation (such as radial micro-expansion when impacted) under dynamic working conditions, avoids local stress concentration caused by rigid constraints, and reduces the risk of fracture.

[0038] The existence of the gap between the surface of the trailer hook ball head 200 and the recessed avoiding areas 127 allows the clamping block to compensate for small assembly errors through local deformation, avoids clamping failure caused by hard interference, and improves the reliability under complex working conditions. If the center axis of the ball head is slightly offset from the axis of the clamping block, the traditional structure is prone to interference between the ball head and the clamping block, and cannot be closed. However, by adopting the scheme of the present application, in which the recessed avoiding areas 127 are provided and a gap is formed between the recessed avoiding areas 127 and the contour of the trailer hook ball head 200, when the ball head is inserted, the gap design of the recessed avoiding areas 127 can avoid the risk of “jamming” caused by machining precision or installation alignment deviation.

[0039] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0040] In the description of the utility model, it is understood that the directions or position relations indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as limiting the utility model in that the indicated devices or elements must have a specific direction, be constructed and operated in a specific direction, and thus cannot be understood as limiting the utility model.

[0041] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0042] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0043] Embodiment one:

[0044] Reference Figures 1 to 10 For the embodiment one of the device for connecting the trailer load and the trailer hook ball head of the utility model, the device for connecting the trailer load and the trailer hook ball head comprises a device body 100, the device body 100 is fixedly connected with the trailer load, such as the trailer frame 400 of the trailer in this embodiment, the bottom of the trailer frame 400 is provided with a roller, and the bicycle or other articles can be placed on the trailer frame 400; the trailer hook ball head 200 is fixedly connected with the vehicle, and the trailer hook ball head 200 comprises a ball and a connecting rod connected with the ball, and the ball is fixedly connected with the vehicle through the connecting rod. The device body 100 and the trailer hook ball head 200 are detachably connected, so as to facilitate the use of the user, in order to ensure that the trailer hook ball head 200 and the device body 100 can be clamped, the diameter of the connecting rod is less than the diameter of the ball.

[0045] The device body 100 comprises a base 110, a clamping mechanism arranged in the base 110, the base is connected to a trailer load, and the clamping mechanism is used for clamping a trailer hook ball head 200. The clamping mechanism comprises two clamping members, at least one clamping member is pivotally connected to the base 110, so that the two clamping members form an openable and closable space for receiving the trailer hook ball head 200. That is, the two clamping members in the clamping mechanism can only one be rotatable relative to the base, or both can be rotatable relative to the base. In order to facilitate the description, the two clamping members are defined as a movable clamping block 120 and a fixed clamping block 130 in the embodiment. The movable clamping block 120 is a pivotable clamping member, that is, the movable clamping block 120 can rotate relative to the base 110, and the rotation of the movable clamping block 120 can control the opening and closing of the openable and closable space. The movable clamping block 120 is fixedly connected with the base, or the movable clamping block 120 is basically stationary, and only needs to be slightly adjusted in position when necessary.

[0046] The base 110 mainly plays a protection and accommodation role. The base 110 in the embodiment is a cuboid structure. The opposite inner walls of the movable clamping block 120 and the fixed clamping block 130 are provided with clamping curved surfaces 121 for cooperating with and clamping the trailer hook ball head 200. For example, the clamping curved surfaces 121 are arranged in a hemispherical shape. In this way, after the movable clamping block 120 and the fixed clamping block 130 are closed, the two clamping curved surfaces 121 can be combined into a spherical openable and closable space to cooperate with the trailer hook ball head 200, so as to wrap the trailer hook ball head 200 and realize the fixed connection between the device body 100 and the trailer hook ball head 200.

[0047] The base 110 beside the movable clamping block 120 is pivotally connected with a locking member 140. The locking member 140 rotates between a locking position and an unlocking position. When the locking member 140 is in the locking position, the locking member 140 limits the movement of the movable clamping block 120, so as to keep the movable clamping block 120 in the position of closing the openable and closable space. When the locking member 140 is in the unlocking position, the locking member 140 does not limit the movement of the movable clamping block 120. In the embodiment, the locking member 140 is taken as an example in the form of a cuboid structure. The locking member 140 comprises a head portion and a tail portion. The tail portion of the locking member 140 is connected with the base 110 through a shaft, so as to realize the pivot connection of the locking member 140 with the base. The head portion of the locking member 140 can abut against the movable clamping block 120, so that the shaft is kept at a distance from the movable clamping block 120, and the movable clamping block 120 has a larger swinging distance to provide sufficient space for cooperating with the trailer hook ball head 200.

[0048] The head of the locking member 140 is provided with an arc-shaped locking surface 143, the center axis of the arc-shaped locking surface coincides with the pivot axis of the locking member 140, and the locking surface 143 abuts against the movable clamp block 120 within the range of the central angle of the arc-shaped locking surface. At this time, the force direction of the movable clamp block 120 acting on the locking member 140 points to the rotation center of the locking member 140, that is, the common normal line direction at the contact point between the movable clamp block 120 and the locking member 140 points to the rotation center of the locking member 140, so that the torque generated by the force of the movable clamp block 120 acting on the locking member 140 is zero. During vehicle movement, the movable clamp block 120 cannot push the locking member 140 to deviate from the locking position abutting against the movable clamp block 120 when subjected to vibration or other external forces, thereby ensuring the relative position between the movable clamp block 120 and the fixed clamp block 130, avoiding loosening of the connector, ensuring that the device body 100 can be firmly connected with the trailer hook ball head 200 for a long time, and ensuring towing safety.

[0049] In the above embodiment, the locking surface 143 is configured as a partial spherical surface or a partial cylindrical surface, that is, the projection of the locking surface 143 in the rotation plane of the locking member 140 is an arc. A larger central angle range can be obtained to adapt to a larger range of impact of the clamping member, and it is ensured that the force applied by the movable clamp block 120 to the locking member 140 from multiple angles can point to the pivot axis of the locking member 140. In particular, when the trailer hook ball head 200 is laterally displaced due to road bumps, the deflection of the clamping member will drive the contact point to slide along the spherical surface, and the contact angle is automatically corrected by the spherical curvature, thereby avoiding the edge stress concentration problem caused by the bias load of the traditional planar locking structure.

[0050] For the connection between the movable clamp block 120 and the base 110, the upper end of the movable clamp block 120 is a pivot end, which is pivotally connected to the base 110 through a pivot shaft 126, and the lower end of the movable clamp block 120 is a free end which can rotate relative to the pivot end. When the free end of the movable clamp block 120 is away from the fixed clamp block 130, the openable and closable space is in an open state, and the trailer hook ball head 200 can be conveniently entered or removed from the openable and closable space; when the free end of the movable clamp block 120 is close to the fixed clamp block 130, the openable and closable space is in a closed state, and the ball head extending into the openable and closable space can be locked therein to complete the connection of the connector.

[0051] The free end of the movable clamp block 120 is provided with an abutting surface 124, that is, the locking surface 143 of the locking member 140 abuts against the abutting surface 124 of the free end of the movable clamp block 120, and the abutting force generated by the locking member 140 can have a larger force arm relative to the rotation shaft 126 of the movable clamp block 120, so that when the locking member 140 is in the locking position, it is more beneficial to maintain the locking state of the movable clamp block 120. The guide surface 125 is located on the outer wall of the movable clamp block 120 between the rotation shaft 126 and the abutting surface 124, and when the locking member 140 rotates from the unlocking position to the locking position, it smoothly pushes the movable clamp block 120 to rotate and allows the locking member 140 to abut against the abutting surface 124, thereby completing the locking of the movable clamp block 120.

[0052] On the basis of the above-mentioned embodiments, for the structure of the movable clamp block 120, in order not to affect the connection relationship between the movable clamp block 120 and the trailer hook ball head 200 when the locking member 140 abuts against the abutting surface 124, the abutting surface 124 is generally arranged on the outer wall of the movable clamp block 120 facing away from the fixed clamp block 130, and the guide surface 125 is further arranged on the outer wall, the guide surface 125 is connected with the abutting surface 124, the locking member 140 pushes the movable clamp block 120 to rotate towards the fixed clamp block 130 along the guide surface 125, and the cross section of the guide surface 125 is in the shape of a circular arc, so that when the locking member 140 acts on the guide surface 125, the movable clamp block 120 can be smoothly pushed to rotate, avoiding the occurrence of jamming. By arranging the guide surface 125, the locking member 140 can also push the movable clamp block 120 to rotate towards the fixed clamp block 130 while rotating from the unlocking position to the locking position, and the guide surface 125 precisely guides the movement of the movable clamp block 120, so that the movable clamp block 120 can more accurately approach the fixed clamp block 130 and realize clamping of the trailer hook ball head 200.

[0053] A stopper 141 protruding from the locking member 140 is arranged at the tail of the locking member 140, when the locking member 140 rotates to the locking position, the stopper 141 abuts against the limiting surface 111 of the base 110, preventing the locking member 140 from continuing to rotate. In the embodiment, the stopper 141 is arranged integrally with the locking member 140, when the locking member 140 rotates from the unlocking position to the locking position, the positioning of the locking member 140 is realized by the abutment of the stopper 141 against the limiting surface 111, that is, after the abutment of the stopper 141 against the limiting surface 111, the locking member 140 cannot continue to rotate, at this time, the locking member 140 is located at the locking position, and the abutment of the stopper 141 against the limiting surface 111 ensures that the locking member 140 can be accurately stopped at the locking position when the locking member 140 is controlled by rotating the handle 150, and the problem of rotating beyond the locking position and failing to lock the movable clamp block 120 cannot occur. Further, the stopper surface can be the side wall of the base 110, so that there is no need to additionally arrange components to form the stopper surface, the rotation radius R of the stopper 141 is greater than the distance L between the rotation axis of the locking member 140 and the adjacent side wall of the base 110, when the locking member 140 is at the locking position, the stopper 141 abuts against the side wall of the base 110, to ensure that the locking member 140 is accurately located at the locking position.

[0054] In addition to the abutment of the stopper 141 against the side wall of the base 110 for positioning, a protrusion towards the rotation axis direction of the locking member 140 can be arranged on the side wall of the base 110, the abutment of the protrusion against the stopper 141 realizes the abutment of the stopper 141, since the protrusion protrudes from the side wall of the base 110, the stopper 141 will apply force to the protrusion in the tangential direction, by designing the position of the stopper 141 of the locking member 140 at the locking position, the force of the stopper 141 on the protrusion can only generate a small component perpendicular to the side wall of the base 110, so that the amount of deformation of the base 110 caused by the force of the locking member 140 is reduced, and the locking member 140 can be more accurately stopped at the locking position.

[0055] Further, the guiding surface 144 is arranged between the locking surface 143 and the bottom surface of the locking member 140, and the rotating radius of the guiding surface 144 is smaller than that of the locking surface 143, so that the locking member 140 pushes the movable clamp block 120 to generate unidirectional displacement when rotating. The guiding surface 144 can be a slope or an arc, and preferably is an arc. When the guiding surface 144 contacts the movable clamp block and pushes the movable clamp block 120 to pass the locking surface 143, the arc-shaped guiding surface 144 can ensure the movable clamp block 120 to rotate stably and reduce impact. Moreover, since the rotating radius of the guiding surface 144 is smaller than that of the locking surface 143, the movable clamp block 120 will not retreat when contacting the locking surface 143 from the guiding surface 144, so that the movable clamp block 120 always rotates towards the fixed clamp block 130 during clamping, and the trailer hook ball head 200 will not loosen when the locking member 140 is in the locking position.

[0056] On the basis of the above embodiment, in order to more conveniently control the switching of the locking member 140 between the locking position and the unlocking position, a rotating handle 150 is rotatably connected to the outside of the base 110 to drive the movable clamp block 120 to rotate and clamp the fixed clamp block 130. The rotating handle 150 can control the rotation of the movable clamp block 120 towards the fixed clamp block 130, so as to realize the convergence of the movable clamp block 120 and the fixed clamp block 130. The rotating handle 150 drives the locking member 140 to rotate, and then the locking member 140 controls the rotation of the movable clamp block 120 towards the fixed clamp block 130. In order to realize the rotation of the rotating handle 150 driving the locking member 140, the shaft of the locking member 140 is extended to be pivotally connected to the base 110, so that one end of the rotating handle 150 is fixed on the same shaft as the locking member 140, and the other end of the rotating handle 150 is provided with a handle 151 for convenient operation.

[0057] Further, the locking member 140 is in the unlocking position as long as it is away from the abutting surface 124, but when the device body 100 is assembled with the trailer hook ball head 200, the device body 100 is first too high and then placed downward to be connected with the trailer hook ball head 200, in order to facilitate this moving process, the user will directly hold the rotating handle 150 to pull up the device body 100. In the embodiment, the rotating handle 150 is in the preferred holding and pulling position by limiting the position of the locking member 140 in the unlocking position. Specifically, along the direction of the rotation of the locking member 140 from the locking position to the unlocking position, the end surface of the base 110 is provided with 142, when 142 abuts against the side wall of the base 110, that is, when the movement stroke of the locking member 140 is limited by 142, the operating handle 151 is located on the vertical axis passing through the center of gravity of the device body 100, and in the operation process, the user does not need to deliberately adjust the force direction and intensity to overcome the influence of the imbalance, so that the device body 100 can be more easily and accurately pulled up to be connected with the trailer hook ball head 200, facilitating the user to pull up. And when it is necessary to control the movement position of the locking member 140, the rotating handle 150 is rotated to realize the locking and unlocking actions of the locking member 140, improving the operation efficiency. In addition to setting 142 on the locking member 140, 142 can also be set on the side wall of the base 110, which can also have the same limiting effect.

[0058] On the basis of the above embodiment, the trailer hook ball head connector further comprises a handle lock assembly 300, and the handle lock assembly 300 comprises a lock tongue 310 rotatably arranged on the base 110. The lock tongue 310 comprises a stop position and a release position. When the lock tongue 310 is in the stop position, the lock tongue 310 abuts against the rotating handle 150, preventing the rotating handle 150 from driving the locking member 140 to be away from the locking position, and preventing the rotating handle 150 from being accidentally touched to cause the device body 100 to be unlocked from the trailer hook ball head 200. When the lock tongue 310 is in the release position, the lock tongue 310 moves out of the movement track of the rotating handle 150, so that the rotating handle 150 can be freely rotated. By setting the handle lock assembly 300, it is ensured that the rotating handle 150 will not be accidentally opened during the towing process, improving the safety of the trailer hook ball head connector in the connected state, and ensuring the safe performance of the trailer hook operation.

[0059] Further, the rotating handle 150 is provided with a stop groove 152, when the locking tongue 310 is in the stop position, the locking tongue 310 is located in the stop groove 152, and the locking tongue 310 and the inner side wall of the stop groove 152 form a stop, so that the locking tongue 310 can limit the rotating handle 150 in two directions of rotation, not only can avoid the accidental rotation of the rotating handle 150 in the connected state causing the locking jaw to deviate from the locking position, but also can make the rotating handle 150 always in the locking position of the locking member 140, and the user can also judge whether the locking member 140 is in the locking position through whether the locking tongue 310 can be turned into the stop groove 152, so that the user can better determine the position of the locking member 140.

[0060] When it is necessary to realize the connection of the device body 100 and the trailer hook ball head 200, the movable clamp block 120 will be rotated and swung first, and the distance between the movable clamp block 120 and the fixed clamp block 130 is maximum. Since the device body 100 is connected with the trailer hook ball head 200 by lifting the device body 100 to align and put down the trailer hook ball head 200, the trailer hook ball head 200 will first touch the movable clamp block 120 and drive the movable clamp block 120 to fold towards the fixed clamp block 130. During this process, the trailer hook ball head 200 will generate a large impact on the movable clamp block 120, which is easy to cause damage to the movable clamp block 120 and unable to normally rotate and fold with the fixed clamp block 130. Therefore, the movable clamp block 120 is provided with a pushing piece 123 for driving the movable clamp block 120 to rotate, and the pushing piece 123 is located above the trailer hook ball head 200. When the trailer hook ball head 200 enters the clamping curved surface 121, the trailer hook ball head 200 abuts against the pushing piece 123, drives the movable clamp block 120 to rotate and clamp with the fixed clamp block 130, that is, through the pushing piece 123 to absorb the impulse of the trailer hook ball head 200, not only plays a buffering role, but also can realize the purpose of driving the movable clamp block 120 to fold with the fixed clamp block 130. When the movable clamp block 120 rotates to the maximum opening angle, the top horizontal height of the pushing piece 123 relative to the movable clamp block 120 is lower, so as to ensure that the trailer hook ball head 200 first contacts the pushing piece 123 after entering the clamping curved surface 121, and avoid the trailer hook ball head 200 directly impacting the movable clamp block 120.

[0061] In the embodiment, the fixed clamp block 130 can also be pivoted on the base through the rotating shaft, but the fixed clamp block 130 is generally stationary when clamping the trailer hook ball head 200. However, due to manufacturing errors or wear after long-term use, the distance between the movable clamp block 120 and the fixed clamp block 130 can be too large or too small after the movable clamp block 120 is abutted by the locking member 140 to the locked position, at which time the fixed clamp block 130 needs to be fine-tuned, therefore, an adjusting seat 170 is arranged on the side wall of the base 110 close to the fixed clamp block 130, and an adjusting bolt 171 is threadedly installed on the adjusting seat 170, one end of the adjusting bolt 171 abuts against the outer wall of the fixed clamp block 130, and the distance between the fixed clamp block 130 and the movable clamp block 120 in the locked position is adjusted by rotating the adjusting bolt 171 relative to the adjusting seat 170. The upper part of the fixed clamp block 130 is also connected to the base 110 through the rotating shaft 126, and one end of the adjusting bolt 171 generally abuts against the bottom of the fixed clamp block 130 to obtain a larger adjusting torque. The position of the fixed clamp block 130 is accurately adjusted by the adjusting bolt 171, so that the trailer hook ball head connector can adapt to trailer hook ball heads 200 of different sizes, improve the versatility and compatibility of the product, meet the diversified use requirements, users can flexibly adjust according to the actual situation, and the practicality and application range of the connector are improved.

[0062] In order to better release the trailer hook ball head 200 after the locking member 140 deviates from the locked position, the movable clamp block 120 can automatically separate from the fixed clamp block 130, on the basis of the above embodiment, an elastic driving member 160 can be arranged in the base 110, the elastic driving member 160 abuts against the movable clamp block 120 to generate a driving force for driving the movable clamp block 120 to rotate away from the fixed clamp block 130. Figure 8 、 Figure 10 As described above, the elastic driving member 160 is fixed in the base 110, the elastic driving member 160 has two elastic legs, which respectively abut against the fixed clamp block 130 and the movable clamp block 120, when the movable clamp block 120 rotates towards the fixed clamp block 130, the distance between the two elastic legs becomes smaller, and the elastic driving member 160 is extruded to accumulate elastic potential energy; when the locking member 140 is removed, the movable clamp block 120 loses the abutting force of the locking member 140, and the elastic potential energy is released, so that the elastic driving member 160 can drive the movable clamp block 120 to rotate away from the fixed clamp block 130 to open the two clamping curved surfaces 121. In addition to the above-mentioned elastic driving member 160, a torsional spring can also be directly sleeved on the rotating shaft 126 of the movable clamp block 120 to achieve the above-mentioned function.

[0063] In use, according to the size of the trailer ball 200 and the error between the movable clamp block 120 and the fixed clamp block 130, the position of the lower end of the fixed clamp block 130 is adjusted by the adjusting bolt 171, the rotating handle 150 is pulled to drive the locking member 140 to the unlocking position, the operating handle 151 of the rotating handle 150 is located directly above the center of gravity of the device body 100, the device body 100 is lifted by the rotating handle 150, and the movable clamp block 120 is rotated under the driving of the elastic driving member 160, so that the lower end of the movable clamp block 120 is opened to the maximum angle with the lower end of the fixed clamp block 130. The device body 100 is aligned with the trailer ball 200, the device body 100 is lowered, the trailer ball 200 enters the openable and closable space between the movable clamp block 120 and the fixed clamp block 130, the trailer ball 200 abuts against the pushing member 123, the movable clamp block 120 is pushed to rotate, the movable clamp block 120 is closed with the fixed clamp block 130 to clamp the trailer ball 200, and then the rotating handle 150 is pulled downward, the rotating handle 150 drives the locking member 140 to the locking position from the unlocking position, in this process, the locking member 140 moves along the guide surface 125 of the movable clamp block 120 to the abutting surface 124, so that the movable clamp block 120 is in the locked state. When the stopper 141 connected to the locking member 140 abuts against the side wall of the base 110, the rotating handle 150 cannot continue to rotate, which indicates that the locking member 140 is in the locking position, the lock tongue 310 is rotated to the stop position, the rotating handle 150 is locked, and the connection between the device body 100 and the trailer ball 200 is completed. If it is necessary to unlock, the lock tongue 310 is rotated to the release position, the rotating handle 150 is pulled to release the locking of the movable clamp block 120 by the locking member 140, the movable clamp block 120 is rotated to be opened, and the trailer ball 200 is released. When the locking member 140 is in the locking position, the abutting surface 124 of the movable clamp block 120 abuts against the locking member 140, and the tangent of the abutting surface 124 at the position intersects with the rotation axis of the locking member 140, that is, the force of the movable clamp block 120 on the locking member 140 passes through the axis of the locking member 140, the torque generated by the force of the movable clamp block 120 on the locking member 140 is zero, the locking member 140 will not be deflected due to the impact of the movable clamp block 120, the relative position of the movable clamp block 120 and the fixed clamp block 130 is fixed, the connector is prevented from loosening, the device body 100 can be connected with the trailer ball 200 stably for a long time, and the safety of towing is ensured.

[0064] The above embodiment mainly introduces a pivotable clamp member and a substantially fixed clamp member, and of course, both the clamp members can be pivotable clamp members, and the pivotable clamp member and the connecting member thereof in the above embodiment are mirrored along the joint surface between the two clamp members to have the same structure, so that when it is necessary to open the openable and closable space, the two clamp members are controlled to rotate in opposite directions to be opened, and when it is necessary to close the openable and closable space, the two clamp members are controlled to rotate in the opposite direction to be closed.

[0065] Embodiment Two

[0066] The present embodiment can be improved based on the first embodiment, or can be implemented independently. The present embodiment is mainly an embodiment for improving the specific structure of the clamping member.

[0067] As shown in Figure 1 , the device for connecting the trailer load and the trailer hook ball head includes a device body 100, which is fixedly connected with the trailer load, such as the frame 400 of the trailer in the present embodiment, the bottom of the frame 400 is provided with a roller, and the frame 400 can accommodate a bicycle or other articles; the trailer hook ball head 200 is fixedly connected with the vehicle, and the trailer hook ball head 200 includes a ball and a connecting rod connected with the ball, and the ball is fixedly connected with the vehicle through the connecting rod. The device body 100 and the trailer hook ball head 200 are detachably connected to facilitate user use, and in order to ensure that the trailer hook ball head 200 can be clamped with the device body 100, the diameter of the connecting rod is smaller than the diameter of the ball.

[0068] As shown in Figures 11 to 13 , the device body 100 includes a base 110 and a clamping mechanism arranged in the base 110, the base is connected with the trailer load, and the clamping mechanism is used for clamping the trailer hook ball head 200. The clamping mechanism includes two clamping members, at least one clamping member is pivotally connected to the base 110, so that the two clamping members form an openable and closable space for receiving the trailer hook ball head 200. That is, the two clamping members in the clamping mechanism can only one be rotatable relative to the base, or both can be rotatable relative to the base.

[0069] In order to facilitate the description, the two clamping members are defined as a movable clamping block 120 and a fixed clamping block 130 in the present embodiment. The movable clamping block 120 is a pivotable clamping member, that is, the movable clamping block 120 can rotate relative to the base 110, and controlling the rotation of the movable clamping block 120 can control the opening and closing of the openable and closable space, while the movable clamping block 120 is fixedly connected with the base, or the movable clamping block 120 is basically stationary, and only needs to be slightly adjusted in position when necessary.

[0070] The dynamic clamp block 120 and the fixed clamp block 130 are symmetrically arranged and oppositely arranged, and the inner walls of the dynamic clamp block 120 and the fixed clamp block 130 are respectively provided with clamping curved surfaces 121 matched with the surface of the trailer hook ball head 200. When the dynamic clamp block 120 and the fixed clamp block 130 are closed, the two clamping curved surfaces 121 are combined to form an openable and closable space for clamping the trailer hook ball head 200. The clamping curved surfaces 121 on the existing dynamic clamp block 120 and the fixed clamp block 130 are all semispherical grooves, and the two clamping curved surfaces 121 are combined to form a spherical openable and closable space matched with the trailer hook ball head 200. However, the structure causes the stress to be concentrated in the area with the largest radial dimension of the trailer hook ball head 200. If the trailer hook ball head 200 is spherical, the stress is concentrated on the equator of the trailer hook ball head 200, that is, the area with the largest radial profile of the trailer hook ball head 200, so that the clamping of the ball is unstable and the trailer hook ball head 200 shakes during the towing process.

[0071] Therefore, in the embodiment, the clamping curved surface 121 is provided with a recessed avoiding area 127. The recessed avoiding area 127 corresponds to the gap between the profile of the trailer hook ball head 200, that is, the recessed avoiding area 127 is not in contact with the trailer hook ball head 200 after the dynamic clamp block 120 and the fixed clamp block 130 are closed. The clamping force points generated by the dynamic clamp block 120 and the fixed clamp block 130 are transferred to the symmetric areas on both sides of the recessed avoiding area 127 to form a mechanical model similar to “two-point clamping”, so that the clamping of the dynamic clamp block 120 and the fixed clamp block 130 on the trailer hook ball head 200 is more stable.

[0072] In the embodiment, the recessed avoiding areas 127 on the two clamping curved surfaces 121 correspond to the profiles of the two ends of the diameter of the trailer hook ball head, respectively. The maximum length of the horizontal line connecting the clamping curved surface on the dynamic clamp block 120 to the clamping curved surface 121 on the fixed clamp block 130 is less than the diameter of the trailer hook ball head 200, that is, the recessed avoiding area 127 needs to avoid the equator of the trailer hook ball head 200 and expand in the vertical direction by a certain area. Moreover, the joint surface of the dynamic clamp block 120 and the fixed clamp block 130 is a vertical surface, the equatorial surface of the trailer hook ball head 200 is in a horizontal plane, the recessed avoiding areas 127 on the two clamping curved surfaces 121 correspond to the equatorial surface of the trailer hook ball head 200, so that the force of the trailer hook ball head 200 on the clamping curved surface 121 can be more evenly distributed to the clamping member, and the local stress of the clamping member can be avoided. The recessed avoiding area 127 accounts for about 20% to 40% of the area of the clamping curved surface 121. A too small recessed avoiding area 127 cannot play an effective avoiding role, and a too large recessed avoiding area will affect the clamping effect of the dynamic clamp block 120 and the fixed clamp block 130 on the trailer hook ball head 200. Of course, the profiles of the two recessed avoiding areas 127 corresponding to the trailer hook ball head 200 deviate from the equator of the trailer hook ball head 200, and the purpose of the utility model can also be achieved.

[0073] Further, as shown in FIG. 6, the dynamic clamp block 120 and the fixed clamp block 130 are provided with a plurality of clamping curved surfaces 121, and the clamping curved surfaces 121 are arranged in a staggered manner. Figure 12 、 Figure 13As shown, the cross section of the recessed avoidance zone 127 is arc-shaped, which can avoid stress concentration and disperse the local load along the tangent direction when the surface of the trailer hook ball head 200 is fitted. In addition to the arc-shaped cross section, the cross section can also be rectangular, which is equivalent to a straight groove design that can be quickly formed.

[0074] In this embodiment, the recessed avoidance zone 127 is a ring-shaped avoidance groove, that is, a through hole is provided in the center of the recessed avoidance zone 127. Through the ring-shaped avoidance groove, the slot can be adapted to the larger diameter trailer hook ball head 200, and the equator of the trailer hook ball head 200 is avoided. The smaller diameter trailer hook ball head 200 can pass through the avoidance groove center opening to avoid, so as to realize the adaptation to the trailer hook ball head 200 of different diameters, and the avoidance hole can allow the equatorial part of the trailer hook ball head 200 to protrude from the opening to the movable clamp block 120 or the fixed clamp block 130, which is beneficial to reduce the size of the movable clamp block 120 and the fixed clamp block 130 in the depth direction along the clamping curved surface 121. Moreover, the through hole can exhaust the air between the trailer hook ball head 200 and the recessed avoidance zone 127 when the movable clamp block 120 rotates to the fixed clamp block 130 to close the openable space, so that the closure of the openable space is more smooth.

[0075] Based on the above embodiment, as shown in the figure, Figure 11 The movable clamp block 120 in this embodiment is a vertical cuboid structure, the upper left corner of which is connected to the base 110 through the rotating shaft 126 to become the pivot end 129, and the lower part is the free end 128. The swing of the free end 128 controls the opening or closing of the openable space. In addition, the upper part of the movable clamp block 120 is also provided with the pivot end 129. When the free end 128 is opened outward, the upper right corner of the movable clamp block 120 will move downward, which may come into contact with the top of the trailer hook ball head 200, causing the trailer hook ball head 200 to be stuck and unable to exit the openable space. Therefore, it is necessary to avoid the above situation. In this embodiment, the clamping curved surface 121 near the pivot end 129 is provided with an avoidance structure 1291. When the movable clamp block 120 rotates around the rotating shaft 126 from the closed position to the open position, the avoidance structure 1291 is configured to prevent interference with the trailer hook ball head 200 in the disengaged state, so as to avoid the movable clamp block 120 being stuck with the trailer hook ball head 200 when the movable clamp block 120 rotates to the open position. The specific structure of the avoidance structure 1291 is not particularly limited, as long as the movable clamp block 120 does not interfere with the trailer hook ball head 200 when the movable clamp block 120 is opened. The specific shape and size of the avoidance structure 1291 can be determined according to the size of the movable clamp block 120 and the positional relationship between the upper right corner of the movable clamp block 120 and the rotating shaft 126.

[0076] Further, the avoidance structure 1291 is a concave cavity concave towards the openable space, the design of the concave cavity does not increase the size of the movable clamp block 120, and is obtained by cutting on the basis of the original movable clamp block 120, which is relatively simple to process and does not need to change the size of other parts. Even if the trailer hook ball head 200 shakes to a certain extent or is cheap, the concave cavity can effectively accommodate the ball head and ensure that the movable clamp block 120 is smoothly opened.

[0077] On the basis of the above-mentioned embodiments, the movable clamp block 120 needs to be opened first to allow the trailer hook ball head 200 to enter the openable space. When the movable clamp block 120 is opened, the upper right corner of the movable clamp block 120 rotates downward into the openable space. When the trailer hook ball head 200 is pushed into the openable space, it will first abut against the inner side of the movable clamp block 120 close to the pivot end 129, pushing the movable clamp block 120 to rotate. In actual use, the user will lift the device body 100 to move above the trailer hook ball head 200 and then put it down. Therefore, when the trailer hook ball head 200 enters the openable space, it will produce a greater impact on the movable clamp block 120, which may cause damage to the movable clamp block 120 or affect the service life of the movable clamp block 120. In order to solve the above technical problems, a pushing piece 123 is arranged on the movable clamp block 120. When the trailer hook ball head 200 is inserted into the openable space, the trailer hook ball head 200 first contacts the pushing piece 123. By the trailer hook ball head 200 abutting against the pushing piece 123 upward, the movable clamp block 120 is driven to rotate in the closing direction. When the movable clamp block 120 is in the open position, the pushing piece 123 is located directly in front of the trailer hook ball head 200 entering the openable space, and the distance between the pushing piece and the trailer hook ball head 200 is less than the distance between the movable clamp block 120 directly in front of the trailer hook ball head 200 and the trailer hook ball head 200. That is, the pushing piece 123 needs to be deeper into the openable space, and the pushing piece 123 needs to contact the trailer hook ball head 200 first. As the trailer hook ball head 200 enters the openable space, the trailer hook ball head 200 will drive the pushing piece 123 to rotate, gradually closing the openable space. Of course, in order to better realize that the pushing piece 123 can drive the movable clamp block 120 to rotate when the pushing piece 123 is pushed by the trailer hook ball head 200, the pushing piece 123 is located at the end of the pivot end 129, so that the trailer hook ball head 200 can exert a larger torque on the pushing piece 123.

[0078] When the entire movable clamp block 120 is in the closed state, an avoidance gap 1231 is provided between the pushing piece 123 and the trailer hook ball head 200, which is to avoid the pushing piece 123 directly abutting against the trailer hook ball head 200, causing the pushing piece 123 and the trailer hook ball head 200 to be deadlocked when the movable clamp block 120 is opened, affecting the trailer hook ball head 200 to exit the openable space.

[0079] In addition, since the pushing piece 123 needs to bear the impact of the trailer hook ball head 200, the service life of the pushing piece 123 is lower than that of the movable clamp block 120, and therefore, in the embodiment, the pushing piece 123 and the movable clamp block 120 are fixed in a detachable connection mode, for example, the pushing piece 123 is fixed on the movable clamp block 120 by screws or buckles, so that the pushing piece 123 can be conveniently replaced when damaged.

[0080] The embodiment solves the problem that the ball head of the existing trailer hook ball head connector easily shakes during towing by arranging the recessed avoidance area 127 in the clamping curved surface 121. The ball head can better fit the shape, reduce local stress concentration, improve the stability of the connection, significantly improve the ability to resist lateral swinging, the gap of the avoidance area allows the trailer hook ball head 200 to produce limited micro-deformation under dynamic working conditions, avoids local stress concentration caused by rigid constraint, and reduces the risk of fracture.

[0081] Other contents not described in the embodiment can be referred to the embodiment one.

[0082] The above only describes specific embodiments of the utility model, but the technical features of the utility model are not limited to this, any person skilled in the art makes changes or modifications in the field of the utility model, and the changes or modifications are covered in the patent range of the utility model.

Claims

1. A device for connecting a trailer load with a trailer ball, comprising: a base connected to the trailer load; and a clamping mechanism for clamping the trailer ball, the clamping mechanism comprising two clamping members, at least one of which is pivotally connected to the base; characterized in that each of the two clamping members is provided with a clamping curved surface on the opposite inner wall thereof, which is adapted to the surface of the trailer ball, and when the two clamping members are closed, the clamping curved surfaces together form an openable space for receiving the trailer ball; a recessed avoidance area is provided in the clamping curved surface, and a gap is formed between the recessed avoidance area and the corresponding profile of the trailer ball.

2. The apparatus for connecting a trailer load to a trailer hitch ball head of claim 1, wherein, The cross section of the recessed avoidance area is arc-shaped or rectangular.

3. The apparatus for connecting a trailer load to a trailer hitch ball head of claim 1, wherein, The recessed avoidance area is a ring-shaped avoidance groove, and the avoidance groove is provided with a through hole identical to the through hole of the outside.

4. The apparatus for connecting a trailer load to a trailer hitch ball head of claim 1, wherein, The recessed avoidance areas on the two clamping curved surfaces correspond to the profiles of the two ends of the diameter of the trailer ball respectively.

5. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 1, wherein, An avoidance structure is further provided on the clamping curved surface of the pivotable clamping member, and the avoidance structure is arranged opposite to the opening of the openable space, and when the opening of the openable space is opened, the avoidance structure is configured to prevent the pivotable clamping member from interfering with the trailer ball in the disengaged state.

6. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 5, wherein, The avoidance structure is a concave cavity concave towards the openable space.

7. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 1, wherein, A pushing member is provided on the pivotable clamping member to drive the pivotable clamping member to rotate, and when the trailer ball enters the openable space, the pushing member is located in front of the trailer ball entering the openable space, and the distance between the pushing member and the trailer ball is less than the distance between the pivotable clamping member in front of the trailer ball entering the openable space and the trailer ball.

8. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 7, wherein, When the openable space is in the closed state, an avoidance gap is provided between the pushing member and the trailer ball to avoid the pivotable clamping member and the trailer ball from being stuck when the openable space is opened.

9. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 7, wherein, The pushing member can be detachably fixed on the pivotable clamping member.

10. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 1, wherein, An elastic driving member is provided in the base, and the elastic driving member is in contact with the pivotable clamping member to drive the two clamping members to rotate in the opposite direction.

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