Traction connecting device

Abstract

The utility model aims to provide a traction connecting device which comprises a pulling assembly, a connecting assembly and a limiting unit, the pulling assembly comprises a pulling head used for being connected with an object to be pulled and a main body part, and a first matching part is arranged on the periphery of the main body part. The connecting assembly comprises a connecting part used for being connected with the traction carrier and a containing part, and the containing part is provided with a second matching part. The main body part can be accommodated in the accommodating part and can move from a first position to a second position in the accommodating part, the first matching part and the second matching part are matched at the first position so as to limit the pull assembly to be separated from the accommodating space, and the first matching part and the second matching part are staggered at the second position so as to limit the pull assembly to be separated from the accommodating space. And the limiting unit can limit the movement of the main body part at the first position towards the second position. The traction connecting device has the characteristics of high structural strength and long service life.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle connecting parts, in particular to a traction connecting device. Background Art

[0002] The hitch, also known as the towing device, is an important part of the automobile towing and towing configuration. The current hitch mainly includes two parts: a ball head and a connecting rod. The hitch is fixedly connected to the towing vehicle through the connecting rod, and the towed object is towed on the hitch through the ball head to achieve towing.

[0003] In order to adapt to heavier towed objects and cope with road conditions encountered by the vehicle during driving, such as climbing slopes and bumps, how to optimize the structure of the towing connection device to improve its own service life and structural strength is a problem that technical personnel in this field have been working to solve. Utility Model Content

[0004] The utility model aims to provide a traction connection device, which has the characteristics of high structural strength and long service life.

[0005] A traction connection device for achieving the above-mentioned purpose comprises:

[0006] Trailer components, including:

[0007] at least one towing head, through which the object to be towed is connected to the towing connection device; and

[0008] A main body, wherein a first matching portion is disposed on the outer periphery of the main body;

[0009] Connectivity components, including:

[0010] a connecting portion, through which the traction connection device is connected to the traction vehicle; and

[0011] an accommodating portion, having an accommodating space, in which a second matching portion is disposed, and in which the main body portion can be plugged, so that the towing assembly and the connecting assembly are connected as a whole; and

[0012] Limiting unit;

[0013] The main body located in the accommodation space can move between a first position and a second position, the first matching portion and the second matching portion match in the first position to restrict the trailer assembly from escaping from the accommodation space, and the first matching portion and the second matching portion are staggered in the second position to allow the trailer assembly to escaping from the accommodation space along its own axis direction;

[0014] The limiting unit is disposed in the towing assembly and / or the connecting assembly and can move to a locked state. The limiting unit in the locked state limits the movement of the main body located at the first position toward the second position.

[0015] In one or more embodiments, the accommodating space is defined by a through hole, and the main body located in the through hole is capable of rotating between the first position and the second position.

[0016] In one or more embodiments, the main body is cylindrical, the first matching portion is a first convex portion arranged on the outer periphery of the main body, the second matching portion is a second convex portion arranged in the accommodating space, and the number of the first convex portion and the number of the second convex portion are at least one respectively.

[0017] In one or more embodiments, a third protrusion is provided at one end of the main body; the main body is allowed to enter the accommodating space along the axial direction of the trailer component until the third protrusion abuts against the connecting component, and the first matching portion is staggered with the second matching portion in the axial direction of the trailer component so that the main body can move from the second position to the first position.

[0018] In one or more embodiments, a first hole is formed in the main body, a second hole connected to the accommodation space is formed in the accommodation portion, and the limiting unit is accommodated in one of the first hole and the second hole;

[0019] When the main body moves from the second position to the first position, the first hole is aligned with the second hole so that the limiting unit can be partially inserted into the other of the first hole and the second hole under the action of external force to limit the movement of the main body.

[0020] In one or more embodiments, an elastic member is provided in the first hole, the limiting unit is a limiting pin elastically supported in the first hole, and the elastic member is configured to: when compressed, the limiting pin can be completely retracted into the first hole, and when not compressed, a portion of the limiting pin can be pushed out of the first hole.

[0021] In one or more embodiments, a third hole coaxially arranged with the second hole is opened in the accommodating portion, one end of the third hole is connected to the second hole, and the other end of the third hole is connected to the external space of the accommodating portion;

[0022] Wherein, the inner diameter of the third hole is smaller than the inner diameter of the second hole.

[0023] In one or more embodiments, a fourth hole coaxially arranged with the second hole is opened in the accommodating portion, one end of the fourth hole is connected to the second hole, and the other end of the fourth hole is connected to the external space of the accommodating portion;

[0024] Wherein, the inner diameter of the fourth hole is greater than or equal to the inner diameter of the second hole, and the traction connection device also includes a plug or a pressing unit detachably connected to the fourth hole.

[0025] In one or more embodiments, a fifth hole is provided in the main body, a sixth hole is provided in the accommodating portion to connect the accommodating space with the external space of the accommodating portion, a third matching portion is further provided on the main body, and a fourth matching portion is correspondingly provided in the accommodating space;

[0026] When the main body located in the accommodation space moves from the second position toward the first position, the third matching portion moves toward the fourth matching portion until it moves to the first position, at which time the third matching portion contacts the fourth matching portion to restrict the main body from continuing to move;

[0027] The fifth hole is aligned with the sixth hole at the first position, and a limiting unit can be inserted into the fifth hole and the sixth hole from the outside to limit the movement of the main body in the accommodating space.

[0028] In one or more embodiments, the opening direction of the second hole or the sixth hole is the same as the direction of the tension applied to the traction connection device under actual working conditions, and the limiting unit is a pin shaft.

[0029] The beneficial effects of the utility model are:

[0030] In actual working conditions, in a traction connection device having this configuration, the traction vehicle transmits the pulling force to the connecting component, which is then transmitted to the trailer component by the connecting component, and finally applied to the towed object. When encountering special road conditions such as bumps, the main body located in the accommodating space will have a tendency to move along the axis direction of the trailer component itself. At this time, the first matching part and the second matching part cooperate to limit the position. The limiting unit only serves to limit the movement of the main body located in the first position toward the second position, and does not limit the movement of the main body along the axis direction. The first matching part and the second matching part are respectively arranged on the periphery of the main body and in the accommodating space, and the structural sizes of the two can be adjusted according to the actual working conditions without affecting the structural strength of the trailer component itself, thereby achieving the effect of increasing the service life of the traction connection device.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0033] Figure 1 A three-dimensional schematic diagram of an embodiment of the traction connection device is shown;

[0034] Figure 2 shows an exploded schematic diagram according to an embodiment of the traction connection device;

[0035] Figure 3 A schematic diagram of a first embodiment of a retaining frame in the traction connection device is shown;

[0036] Figure 4 A schematic diagram showing an assembly method of a limiting unit according to a first embodiment of the traction connection device;

[0037] Figure 5 A schematic diagram showing an assembled state of a towing assembly according to a first embodiment of the towing connection device is shown;

[0038] Figure 6 shows an exploded schematic diagram according to a second embodiment of the traction connection device;

[0039] Figure 7 A schematic diagram showing an assembly method of a limiting unit according to a second embodiment of the traction connection device;

[0040] Figure 8 A schematic diagram showing an assembled state of a towing assembly according to a second embodiment of the towing connection device is shown;

[0041] Fig. 9 shows an exploded schematic diagram according to a third embodiment of the traction connection device;

[0042] Fig.10 A schematic diagram showing an assembly method of a limiting unit according to a third embodiment of the traction connection device;

[0043] Fig.11 as well as Fig.12A schematic diagram of the assembly state of the towing assembly according to the third embodiment of the towing connection device is shown in two viewing angles respectively;

[0044] Fig.13 A schematic top view of a retaining frame according to a third embodiment of the traction connection device is shown;

[0045] Fig.14 A schematic diagram of the existing towing device structure is shown. DETAILED DESCRIPTION

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

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

[0048] like Fig.14 The structure of the existing trailer device shown in the figure is composed of a ball head 901, a ball head holder 902 and a connecting rod 903. Among them, the ball head holder 902 is provided with a through hole 900 for the ball head 901 to pass through, and the ball head 901 is provided with a fixing hole. Fasteners 904 such as bolts and pins are provided through the fixing hole to pass through the ball head 901 to fix the ball head 901 to the ball head holder 902. In actual working conditions, the ball head 901 of the trailer device is used to connect with the towed object (such as cargo), and the connecting rod 903 is connected to the traction vehicle (such as a car), so that the towed object is towed by the trailer device. However, as Fig.14 In the existing configuration shown in , the fastener 904 serves to axially limit the ball head 901 in the through hole 900. Although in actual working conditions, the ball head 901 is mainly subjected to radial tension in the traction direction, when encountering special road conditions such as bumps, the fastener 904 may be subjected to a large axial force. If the fastener 904 is not thick enough, it may break, and if the fastener 904 is designed to be too thick, it will be necessary to open a relatively large fixing hole in the ball head 901, thereby affecting the structural strength of the ball head itself. The above problems will affect the service life of the traction connection device.

[0049] In order to solve the deficiencies existing in the existing towing device structure, according to some embodiments of the present application, a towing connection device is provided, which has a reasonable structural design, high structural strength and long service life.

[0050] like Figure 1 shows a three-dimensional schematic diagram according to an embodiment of the traction connection device, Figure 2 The exploded schematic diagram of an embodiment of the towing connection device is shown, and the towing connection device includes a towing assembly 1, a connecting assembly 2 and a limiting unit 3. The towing assembly 1 includes a towing head 10 and a main body 11. The number of the towing head 10 is at least one. For example, the cargo waiting to be towed is connected to the towing connection device through the towing head 10. The outer periphery of the main body 11 is provided with a first matching portion 110. The connecting assembly 2 includes a connecting portion 20 and a receiving portion 21. The towing connection device is connected to a towing vehicle such as a car through the connecting portion 20. The receiving portion 21 has a receiving space 210, and a second matching portion 211 is provided in the receiving space 210. The main body 11 can be plugged into the receiving space 210 so that the towing assembly 1 and the connecting assembly 2 are connected as a whole.

[0051] The main body 11 in the accommodation space 210 can move between the second position and the first position. In the first position, the first matching portion 110 matches with the second matching portion 211 to prevent the trailer assembly 1 from escaping from the accommodation space 210. In the second position, the first matching portion 110 and the second matching portion 211 are staggered to allow the trailer assembly 1 to escape from the accommodation space 210 along its own axis direction a.

[0052] The limiting unit 3 is disposed in the towing assembly 1 and / or the connecting assembly 2 and can move to a locked state. The limiting unit 3 in the locked state limits the movement of the main body 11 located at the first position toward the second position.

[0053] In the actual working condition of the traction connection device with this configuration, the traction vehicle transmits the pulling force to the connection component 2, which is then transmitted from the connection component 2 to the trailer component 1, and finally applied to the towed object. When encountering special road conditions such as bumps, the main body 11 located in the accommodating space 210 will have a tendency to move along the axis direction a of the trailer component 1 itself. At this time, the first matching portion 110 and the second matching portion 211 cooperate to limit the position. The limiting unit 3 only plays a role in limiting the movement of the main body 11 located in the first position toward the second position, and does not limit the movement of the main body 11 along the axis direction a. The first matching portion 110 and the second matching portion 211 are respectively arranged on the periphery of the main body 11 and the accommodating space 210, and the structural size of the two can be adjusted according to the actual working conditions without affecting the structural strength of the trailer component 1 itself, thereby achieving the effect of increasing the service life of the traction connection device.

[0054] In the description of the embodiments of the present application, the technical terms "first XX" and "second XX", such as "first matching part" and "second matching part", are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0055] In the description of the embodiments of the present application, the term "and / or" is merely a term used to describe the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

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

[0057] In some embodiments of the traction connection device, the accommodating space 210 is a through hole as shown in the figure, and the main body 11 can be inserted into the through hole. The main body 11 located in the through hole can rotate from the first position to the second position, and can also rotate from the second position to the first position. By configuring the accommodating space 210 as a through hole, the assembly process can be completed by simply inserting the main body 11, thereby improving the efficiency of assembly.

[0058] In some other embodiments different from those shown in the figures, the accommodating space may also be a blind hole or a groove of other suitable configuration, and the main body may translate from the second position to the first position in the accommodating space, for example, in the shape of a long groove.

[0059] In some embodiments of the traction connection device, the main body 11 is cylindrical as shown in the figure, the first matching portion 110 is a first convex portion arranged on the outer periphery of the main body 11, and the second matching portion 211 is a second convex portion arranged in the accommodating space 210, and the number of the first convex portion and the number of the second convex portion are at least one. Among them, in the embodiment shown in the figure, the number of the second convex portions is a pair, and similarly, the number of the first convex portions corresponds to the number of the second convex portions and is also configured as a pair. An avoidance notch 212 is formed between the pair of second convex portions. When the main body 11 is inserted into the accommodating space 210 along the opening direction of the through hole, the avoidance notch 212 avoids the first convex portion, so that the main body 11 can move to the second position. By rotating the main body 11, the first convex portion and the second convex portion can be aligned with each other along the opening direction of the through hole, so that the main body 11 is restricted from escaping from the accommodating space 210 by the cooperation between the first convex portion and the second convex portion. In the above structure, the first protrusion cooperates with the second protrusion to limit the main body 11 from escaping from the accommodating space 210. By increasing the thickness of the first protrusion and / or the second protrusion, the axial strength of the traction connection device can be increased. At the same time, the structure is simple and easy to assemble.

[0060] In some other embodiments different from those shown in the figure, the number of the first protrusion and / or the second protrusion can be one or more different from the number shown in the figure, for example, the first protrusion can be arranged in a semicircular arc shape, and correspondingly, the second protrusion can also be arranged in a semicircular arc shape. In some other embodiments different from those shown in the figure, the first matching portion 110 can be a groove opened on the outer periphery of the main body 11, and the second matching portion 211 can be a convex block arranged corresponding to the groove.

[0061] In some embodiments of the towing connection device, a third protrusion 111 is provided at one end of the main body 11. When the main body 11 is allowed to enter the accommodation space 210 along the axial direction a of the towing assembly until the third protrusion 111 abuts against the connecting assembly 2, the first matching portion 110 is staggered with the second matching portion 211 in the axial direction a of the towing assembly (i.e., Figure 1 and Figure 2 In the direction shown in the figure, the first matching portion 110 is located below the second matching portion 211), so that the main body 11 can move from the second position to the first position. In some specific embodiments of the towing connection device, as shown in the figure, the third protrusion 111 is a protruding ring arranged around the outer periphery of the main body 11. In some other embodiments, the third protrusion 111 can also have other suitable shapes, such as a boss. By providing the third protrusion 111, it is possible to achieve easy positioning between the towing component 1 and the connecting component 2 during the assembly process, simplifying the complexity of assembly.

[0062] In some specific embodiments of the towing connection device, the towing head 10 is a ball head. For example, as shown in the figure, the towing head 10 is a pair of ball heads arranged at both ends of the main body 11. It is understandable that in some other embodiments different from those shown in the figure, the number of ball heads can also be one. In other suitable embodiments, the towing head 10 can have other different suitable shapes, such as a square head or a disc shape.

[0063] In some specific embodiments of the traction connection device, the connection assembly 2 includes a retaining frame 201 and a connecting frame 202, wherein the retaining frame 201 has a receiving portion 21, and the connecting frame 202 has a longitudinal rod 2021 and a transverse rod 2022, wherein the transverse rod 2022 defines a connecting portion 20, and the retaining frame 201 can slide along the longitudinal rod 2021. The connection assembly 2 also includes a locking member not shown in the figure, through which the retaining frame 201 can be fixed to the longitudinal rod 2021. Among them, a reinforcing rib 2023 is provided between the longitudinal rod 2021 and the transverse rod 2022 to ensure the overall structural strength of the connecting frame 202. Specifically, a slide groove 22 is also provided in the retaining frame 201, and a slide rail 23 is provided on the longitudinal rod 2021, and the slide rail 23 cooperates with the slide groove 22 to realize the sliding of the retaining frame 201 along the longitudinal rod 2021. A first fixing hole 24 is provided on the outer periphery of the retainer 201, and a second fixing hole 25 is provided on the longitudinal rod 2021. When the retainer 201 slides along the longitudinal rod 2021 until the first fixing hole 24 is aligned with the second fixing hole 25, a locking member such as a pin can be inserted to fix the retainer 201 on the longitudinal rod 2021. It can be understood that in other embodiments different from the structure shown in the figure, the retainer 201 and the connecting frame 202 constituting the connecting assembly can also be an integral part, and in this embodiment, the two are provided separately to adjust the height of the ball head according to actual needs.

[0064] On the basis of one or more of the above embodiments, in order to limit the main body 11 located in the accommodating space 210 and restrict its movement from the first position to the second position, the following first to third embodiments specifically describe the specific configuration of the limiting unit 3:

[0065] First embodiment

[0066] Figures 2 to 5 A schematic diagram of a first embodiment of the traction connection device is shown, wherein: Figure 3 A schematic diagram of a first embodiment of a retaining frame in the traction connection device is shown; Figure 4 A schematic diagram showing an assembly method of a limiting unit according to a first embodiment of the traction connection device is shown. Figure 4 The cage shown in is a half-section structure; Figure 5 FIG. 1 shows a schematic diagram of the assembly state of a towing assembly according to the first embodiment of the towing connection device. Figure 5 The cage shown in FIG. 1 is a half-section structure.

[0067] In the first embodiment, the main body 11 is provided with a first hole 41, the accommodating portion 21 is provided with a second hole 42 connected to the accommodating space 210, and the limiting unit 3 is accommodated in one of the first hole 41 and the second hole 42. When the main body 11 moves from the second position to the first position, the first hole 41 and the second hole 42 are aligned (i.e. Figure 5 As shown in the state, the limiting unit 3 can be partially inserted into the other of the first hole 41 and the second hole 42 under the action of external force to limit the movement of the main body 11.

[0068] Specifically, as shown in the figure, an elastic member 31 is provided in the first hole 41, and the limiting unit 3 is a limiting pin elastically supported in the first hole 41. The elastic member 31 is configured to: when compressed, the limiting pin can be completely retracted into the first hole, and when not compressed, a portion of the limiting pin can be pushed out of the first hole 41. When assembling the traction connection device with this configuration, the limiting unit 3 is first compressed back into the first hole 41, and then the main body 11 is placed in the accommodating space 210, and an external force is applied to make the main body 11 move from the second position toward the first position. During the movement, the limiting unit 3 abuts against the wall surface constituting the accommodating space 210 to maintain the state of being compressed back into the first hole 41. After the first hole 41 is aligned with the second hole 42, the elastic member 31 pushes out the limiting unit 3, so that at least a portion of the limiting unit 3 is located in the first hole 41, and the remaining portion is located in the second hole 42, so as to achieve the limit. In a specific embodiment, the limiting unit 3 is a coil spring.

[0069] In some other embodiments different from those shown in the figure, the limiting unit 3 can also be arranged in the second hole, for example, a first magnetic unit. A second magnetic unit is arranged in the first hole of the main body. When the first hole is aligned with the second hole, the first magnetic unit is sucked out by the second magnetic unit to achieve limiting.

[0070] In the aforementioned first embodiment, a fourth hole 44 coaxially arranged with the second hole 42 is provided in the accommodating portion 21, one end of the fourth hole 44 is in communication with the second hole 42, and the other end is in communication with the external space of the accommodating portion 21. The inner diameter of the fourth hole 44 is greater than or equal to the inner diameter of the second hole 42, and the towing connection device further includes a plug 32 detachably connected to the fourth hole 44, which can be connected to the fourth hole 44 by, for example, threading. When the towing assembly 1 needs to be disassembled, the plug can be removed, and then the limiting unit 3 and the elastic member 31 can be poured out from the second hole 42 and the fourth hole 44, and then the main body is moved to the second position so that it can be disassembled.

[0071] On the basis of the aforementioned embodiments, the first embodiment may also have variations, for example, the inner diameter of the fourth hole 44 is greater than or equal to the inner diameter of the second hole 42, and a pressing unit is provided in the fourth hole, such as a bolt with a conical head. When the towing assembly 1 needs to be disassembled, the bolt is screwed so that its conical head squeezes the limiting unit 3 and retracts it into the second hole, and then the main body is moved to the second position so that it can be removed.

[0072] With the above configuration, since the inner diameter of the fourth hole 44 located in the outer space of the accommodation portion 21 is greater than or equal to the inner diameter of the second hole 42 , the overall processing is more convenient.

[0073] Second embodiment

[0074] Figures 6 to 8 A schematic diagram of a first embodiment of the traction connection device is shown, wherein: Figure 6 shows an exploded schematic diagram according to a second embodiment of the traction connection device; Figure 7 A schematic diagram showing an assembly method of a limiting unit according to a second embodiment of the traction connection device is shown. Figure 7 The cage shown in is a half-section structure; Figure 8 FIG. 1 shows a schematic diagram of the assembly state of a towing assembly according to the second embodiment of the towing connection device. Figure 8 The cage shown in FIG. 1 is a half-section structure.

[0075] On the basis of the first embodiment, the second embodiment is modified as follows: a third hole 43 is provided in the accommodating portion 21' and is coaxial with the second hole 42'. One end of the third hole 43 is connected to the second hole 42', and the other end is connected to the external space of the accommodating portion 21'. The inner diameter of the third hole 43 is smaller than the inner diameter of the second hole 42'. When the trailer assembly 1' needs to be disassembled, a component such as a thimble is passed through the fourth hole 44 to squeeze the limiting unit 3', so that the limiting unit 3' is retracted into the second hole 42', and then the main body 11' is moved to the second position so that it can be disassembled.

[0076] Third embodiment

[0077] Figures 9 to 13 A schematic diagram of a first embodiment of the traction connection device is shown, wherein: Fig. 9 shows an exploded schematic diagram according to a third embodiment of the traction connection device; Fig.10 A schematic diagram showing an assembly method of a limiting unit according to a third embodiment of the traction connection device is shown. Fig.10 The cage shown in is a half-section structure; Fig.11 as well as Fig.12 The schematic diagrams of the assembly state of the towing assembly according to the third embodiment of the towing connection device are shown in two viewing angles respectively. Fig.11 as well as Fig.12 The cage shown in the figure is a half-section structure. Fig.13 FIG. 1 is a schematic top view of a retaining frame according to a third embodiment of the traction connection device.

[0078] In the present embodiment, a fifth hole 45 is provided in the main body 11", a sixth hole 46 connecting the accommodating space 210" with the external space of the accommodating portion 21" is provided in the accommodating portion 21", a third matching portion 51 is further provided on the main body 11", and a fourth matching portion 52 is correspondingly provided in the accommodating space 210". When the main body 11" located in the accommodating space 210" moves from the second position toward the first position, the third matching portion 51 moves toward the fourth matching portion 52 until it moves to the first position, at which time the third matching portion 51 contacts the fourth matching portion 52 to limit the main body 11" from continuing to move. The fifth hole 45 and the sixth hole 46 are aligned at the first position, and the limiting unit 3" can be inserted into the fifth hole 45 and the sixth hole 46 from the outside to limit the movement of the main body 11" in the accommodating space 210".

[0079] In a specific embodiment, a seventh hole 47 is further provided on the other side of the main body 11" opposite to the fifth hole 45, the third matching portion 51 is a pin disposed in the seventh hole 47, a quarter annular groove 200 is provided in the accommodating space 210", and the fourth matching portion 52 is a side wall of the quarter annular groove 200. When the pin rotates to abut against the side wall of the quarter annular groove 200, the main body 11" just moves to the first position. This configuration makes it easy to quickly determine whether the main body 11" has moved to a suitable position.

[0080] In some other embodiments different from those shown in the figures, the third matching portion may be a groove, and the fourth matching portion may be a protrusion.

[0081] In the first to third embodiments, the traction connection device may further include the following features: the direction of the second hole 42 or the sixth hole 46 is the same as the direction of the tension on the traction connection device under actual working conditions, and the limiting unit 3 is a pin. Fig.14 In the existing configuration shown, when the fastener 904 is a bolt, the tension on the ball head 901 is actually borne by the fastener 904 and the ball head 901, which makes the fastener 904 easy to be worn. However, by making the opening direction of the second hole 42 or the sixth hole 46 the same as the direction of the tension on the traction connection device under actual working conditions, and configuring the limiting unit 3 as a pin, the limiting unit 3 only plays a role in preventing the main body 11 from rotating, but is not actually subjected to tension. The object of the tension is the arc-shaped wall surface of the main body 11 and the accommodating portion 21, thereby further improving the service life of the traction connection device.

[0082] Specifically, in the embodiment shown in the figure, the second hole 42 or the sixth hole 46 is provided in the bottom wall 220 of the slide slot 22 of the holder 201. In some other suitable embodiments, the second hole 42 or the sixth hole 46 may also be provided in the arc-shaped wall surface of the holder 201. By providing the second hole 42 or the sixth hole 46 in the bottom wall 220 of the slide slot 22 of the holder 201, the limiting component can be hidden, thereby playing an anti-theft role.

[0083] In the description of the embodiments of the present application, hole A and hole B are coaxial, which means that hole A and hole B are opened along approximately the same axial direction, for example, hole A and hole B have the same axial direction, or the axial direction of one of them has a certain component in the axial direction of the other, preferably, the angle with this direction is within 10°, and more preferably, the angle is within 5°.

[0084] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0085] It should be understood that "along" a certain direction mentioned in the text means that there is at least a component in the direction, preferably, the angle with the direction is within 10°, and more preferably, the angle is within 5°.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A traction connection device, characterized in that: include: Trailer components, including: at least one towing head, through which the object to be towed is connected to the towing connection device; and A main body, wherein a first matching portion is disposed on the outer periphery of the main body; Connectivity components, including: a connecting portion, through which the traction connection device is connected to the traction vehicle; and an accommodating portion, having an accommodating space, in which a second matching portion is disposed, and in which the main body portion can be plugged, so that the towing assembly and the connecting assembly are connected as a whole; and Limiting unit; The main body located in the accommodation space can move between a first position and a second position, the first matching portion and the second matching portion match in the first position to restrict the trailer assembly from escaping from the accommodation space, and the first matching portion and the second matching portion are staggered in the second position to allow the trailer assembly to escaping from the accommodation space along its own axis direction; The limiting unit is disposed in the towing assembly and / or the connecting assembly and can move to a locked state. The limiting unit in the locked state limits the movement of the main body located at the first position toward the second position.

2. The traction connection device according to claim 1, characterized in that: The accommodation space is defined by a through hole, and the main body located in the through hole can rotate between the first position and the second position.

3. The traction connection device according to claim 1, characterized in that: The main body is cylindrical, the first matching portion is a first convex portion arranged on the outer periphery of the main body, the second matching portion is a second convex portion arranged in the accommodating space, and the number of the first convex portion and the number of the second convex portion are at least one respectively.

4. The traction connection device according to claim 1, characterized in that: A third protrusion is provided at one end of the main body; the main body is allowed to enter the accommodating space along the axial direction of the trailer component until the third protrusion abuts against the connecting component, and the first matching portion is staggered with the second matching portion in the axial direction of the trailer component, so that the main body can move from the second position to the first position.

5. The traction connection device according to claim 1, characterized in that: A first hole is formed in the main body, a second hole connected to the accommodation space is formed in the accommodation portion, and the limiting unit is accommodated in one of the first hole and the second hole; When the main body moves from the second position to the first position, the first hole is aligned with the second hole so that the limiting unit can be partially inserted into the other of the first hole and the second hole under the action of external force to limit the movement of the main body.

6. The traction connection device according to claim 5, characterized in that: An elastic member is provided in the first hole, and the limiting unit is a limiting pin elastically supported in the first hole. The elastic member is configured to: when compressed, the limiting pin can be completely retracted into the first hole, and when not compressed, a portion of the limiting pin can be pushed out of the first hole.

7. The traction connection device according to claim 6, characterized in that: A third hole is provided in the accommodating portion coaxially with the second hole, one end of the third hole is connected to the second hole, and the other end of the third hole is connected to the external space of the accommodating portion; Wherein, the inner diameter of the third hole is smaller than the inner diameter of the second hole.

8. The traction connection device according to claim 6, characterized in that: A fourth hole coaxially arranged with the second hole is formed in the accommodating portion, one end of the fourth hole is connected with the second hole, and the other end of the fourth hole is connected with the external space of the accommodating portion; Wherein, the inner diameter of the fourth hole is greater than or equal to the inner diameter of the second hole, and the traction connection device also includes a plug or a pressing unit detachably connected to the fourth hole.

9. The traction connection device according to claim 1, characterized in that: A fifth hole is provided in the main body, a sixth hole is provided in the accommodating portion to connect the accommodating space with the external space of the accommodating portion, a third matching portion is further provided on the main body, and a fourth matching portion is correspondingly provided in the accommodating space; When the main body located in the accommodation space moves from the second position toward the first position, the third matching portion moves toward the fourth matching portion until it moves to the first position, at which time the third matching portion contacts the fourth matching portion to restrict the main body from continuing to move; The fifth hole is aligned with the sixth hole at the first position, and a limiting unit can be inserted into the fifth hole and the sixth hole from the outside to limit the movement of the main body in the accommodating space.

10. The traction connection device according to claim 5, characterized in that: The opening direction of the second hole is the same as the direction of the pulling force on the traction connection device under actual working conditions, and the limiting unit is a pin shaft.

11. The traction connection device according to claim 9, characterized in that: The opening direction of the sixth hole is the same as the direction of the tension applied to the traction connection device under actual working conditions, and the limiting unit is a pin shaft.

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