Connecting device for trailer-type RV

Abstract

The present application provides a connection device for a trailer caravan, including a connecting ball and a ball head connecting piece, the ball head connecting piece including a main body and a movable part, the movable part can move relative to the main body and a buffer spring is provided between the movable part and the main body, the ball head connecting piece is provided with a accommodating cavity for accommodating the connecting ball, a first clamping piece and a second clamping piece are respectively provided on both sides of the accommodating cavity, the first clamping piece and the movable part are fixed by a connecting rod, a transmission piece is provided between the second clamping piece and the movable part, the movable part approaching the accommodating cavity drives the first clamping piece away from the accommodating cavity and drives the second clamping piece away from the accommodating cavity, and the movable part away from the accommodating cavity drives the first clamping piece close to the accommodating cavity and drives the second clamping piece close to the accommodating cavity. The connection device of the present application can reduce the impact force between the caravan and the ball head connecting piece, and reduce the impact force between the connecting ball and the ball head connecting piece when the towing vehicle brakes.

Description

Technical Field

[0001] The present application relates to the field of trailer-type RVs, and specifically provides a connection device for a trailer-type RV. Background Art

[0002] RVs, also known as "homes on wheels," combine the functions of a "house" and a "car." They are equipped with all the basic amenities to meet the user's daily needs while also being roadworthy. RVs are categorized into self-propelled RVs and trailer RVs. Self-propelled RVs, like other cars, can travel on their own power, while trailer RVs lack their own power and require a tow vehicle to propel them.

[0003] In the prior art, a ball hitch is typically installed on a tractor, and a connector that assembles with the ball hitch is installed on the RV. Once the ball hitch and the connector are secured together, the tractor can pull the RV forward. However, with this existing connection method, when the tractor brakes, the inertia of the RV causes a significant instantaneous impact at the connection between the RV and the connector, as well as at the connection between the ball hitch and the connector, which can easily damage the RV and the connection between the ball hitch and the connector. Summary of the Invention

[0004] The cam is connected to the movable part by a spring, and the cam is connected to the movable part by a spring. A transmission rod, a gear and a second transmission rod, the first transmission rod and the second transmission rod are both provided with a latching tooth matching the gear, one end of the first transmission rod is fixedly connected to the movable part, and one end of the second transmission rod is fixedly connected to the second clamping member, the main body is provided with a limiting groove for accommodating the first transmission rod and the second transmission rod, so that the first transmission rod and the second transmission rod can move along the same moving direction as the movable part, the movable part approaching the accommodating cavity drives the first transmission rod to approach the accommodating cavity, the first transmission rod drives the second transmission rod away from the accommodating cavity through the gear, and then drives the second clamping member away from the accommodating cavity, the movable part moving away from the accommodating cavity drives the first transmission rod away from the accommodating cavity, the first transmission rod drives the second transmission rod to approach the accommodating cavity through the gear, and then drives the second clamping member to approach the accommodating cavity, and the movable part moving to the position farthest away from the accommodating cavity causes the first clamping member and the second clamping member to clamp the connecting ball located in the accommodating cavity.

[0005] Optionally, a first spring is provided between the first clamping member and the main body, and the first clamping member in contact with the connecting ball compresses the first spring, and / or,

[0006] A second spring is provided between the second clamping member and the main body, and the second clamping member in contact with the connecting ball compresses the second spring.

[0007] Optionally, the first clamping member and the second clamping member are provided with an arcuate surface on one side facing the accommodating cavity, and the arcuate surface matches the shape of the connecting ball, thereby fitting with the surface of the connecting ball.

[0008] Optionally, elastic gaskets are provided on the surfaces of the first clamping member and the second clamping member facing the accommodating cavity.

[0009] Optionally, the connecting rod is provided on both sides of the movable portion and the first clamping member, and the transmission member is provided on both sides of the movable portion and the second clamping member.

[0010] Optionally, the axes of the first transmission rod and the second transmission rod are located in the same horizontal plane.

[0011] Optionally, the connecting ball is provided with clamping grooves corresponding to the first clamping member and the second clamping member respectively, and the movable part moved to the position farthest from the accommodating cavity enables the first clamping member and the second clamping member to be respectively embedded in the clamping grooves.

[0012] Optionally, the sizes of the first clamping member and the second clamping member gradually increase from the side facing the accommodating cavity to the direction away from the accommodating cavity, thereby forming guide surfaces on the first clamping member and the second clamping member.

[0013] Optionally, the guide surface is configured as a spherical surface.

[0014] It is understood by those skilled in the art that the aforementioned connection device for a trailer caravan in this application has at least the following beneficial effects:

[0015] 1. By arranging a main body and a movable part on the ball head connector, and arranging a first clamping part and a second clamping part on both sides of the accommodating cavity, during use, the connecting ball can be set on the tractor and the ball head connector can be set on the RV. When the tractor pulls the RV forward, the movable part is pulled to the position farthest from the accommodating cavity. At this time, the movable part uses the connecting rod to pull the first clamping part, so that the first clamping part and the connecting ball in the accommodating cavity are in close contact. At the same time, the movable part uses the transmission part to push the second clamping part, so that the second clamping part and the connecting ball in the accommodating cavity are in close contact, so that the first clamping part and the second clamping part clamp the connecting ball, thereby ensuring the connection stability between the tractor and the RV. When the tractor brakes, the RV Under the action of inertia, the movable part moves in the hollow cavity and presses against the buffer spring, thereby reducing the impact at the connection between the RV and the ball joint. At the same time, the movable part drives the first transmission rod to move in the direction closer to the accommodating cavity. The moving first transmission rod drives the gear to rotate through the latch gear. The rotating gear drives the second transmission rod to move in the direction away from the accommodating cavity, and then drives the second clamping member to move in the direction away from the accommodating cavity, that is, to move in the direction away from the connecting ball, thereby preventing the connecting ball from being subjected to a large instantaneous impact. In addition, the impact at the RV and the ball joint is reduced, and the impact at the connection between the connecting ball and the ball joint is also reduced, effectively preventing the RV, the ball joint and the connecting ball from being damaged by the impact. In addition, because the first clamping member and the second clamping member are respectively provided on both sides of the accommodating cavity, the connecting ball can also be set on the RV and the ball joint on the tractor, which can also achieve a buffering effect.

[0016] 2. By arranging a first spring between the first clamping member and the main body, and a second spring between the second clamping member and the main body, the first clamping member is subjected to a force directed toward the accommodating cavity given by the first spring, and the second clamping member is subjected to a force directed toward the accommodating cavity given by the second spring, thereby making the first clamping member, the second clamping member and the connecting ball fit more closely, so that the first clamping member and the second clamping member have a better clamping effect on the connecting ball.

[0017] 3. By providing an arcuate surface matching the shape of the connecting ball on the side of the first clamping member and the second clamping member facing the accommodating cavity, when the first clamping member and the second clamping member clamp the connecting ball, they can fit tightly with the outer surface of the connecting ball through their respective arcuate surfaces, thereby improving the clamping effect of the connecting ball.

[0018] 4. By arranging elastic gaskets on the sides of the first clamping member and the second clamping member facing the accommodating cavity, the clamping effect of the first clamping member and the second clamping member on the connecting ball is improved and it helps to further reduce the impact between the connecting ball and the ball head connector.

[0019] 5. By arranging connecting rods and transmission parts on both sides of the movable part, the connection between the movable part and the first clamping part and the second clamping part is made more stable.

[0020] Furthermore, by locating the axes of the first transmission rod and the second transmission rod in the same horizontal plane, the space occupied by the transmission member in the vertical direction is reduced, which facilitates the simultaneous connection of the connecting rod and the transmission member to the movable part.

[0021] 6. By providing a clamping groove on the connecting ball, the first clamping member and the second clamping member can be embedded in the clamping groove, thereby improving the fixing effect of the connecting ball.

[0022] Furthermore, by providing guide surfaces on the first clamping member and the second clamping member, the first clamping member and the second clamping member can be more easily embedded in the clamping groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Some embodiments of the present application are described below with reference to the accompanying drawings, in which:

[0024] Figure 1 This is a schematic structural diagram of the connecting device in the first embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the connection between the movable portion and the first clamping member in the first embodiment of the present application;

[0026] Figure 3 is a schematic diagram of the connection between the movable portion and the second clamping member in the first embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of the cooperation between the first clamping member, the second clamping member and the connecting ball in the second embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1. Connecting ball; 11. Clamping groove; 2. Ball head connector; 21. Main body; 211. Accommodating chamber; 212. Hollow cavity; 213. First guide groove; 214. Second guide groove; 22. Movable part; 23. Buffer spring; 24. First clamping member; 25. Second clamping member; 26. Connecting rod; 27. Transmission member; 271. First transmission rod; 272. Gear; 273. Second transmission rod. DETAILED DESCRIPTION

[0030] It should be understood by those skilled in the art that the embodiments described below are only part of the embodiments of the present application, rather than all the embodiments of the present application, and that these embodiments are intended to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Based on the embodiments provided in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should still fall within the scope of protection of the present application.

[0031] It should be noted that in the description of this application, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer" that indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be understood as a limitation on this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0032] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0033] The connecting device of the present application includes a connecting ball and a ball head connecting piece, the ball head connecting piece includes a main body and a movable part, the main body is provided with a hollow cavity distributed along its own axial direction and an accommodating cavity for accommodating the connecting ball, a buffer spring is provided in the hollow cavity, the main body is provided with a guide hole connected to the hollow cavity, the movable part is arranged in the guide hole and one end is located in the hollow cavity, one end of the buffer spring is connected to the main body, and the other end is connected to the movable part, the accommodating cavity is respectively provided with a first guide groove and a second guide groove on both sides of the accommodating cavity along the axial direction of the main body, a first clamping piece is provided in the first guide groove, and a second clamping piece is provided in the second guide groove. The first clamping piece and the movable part are fixed by a connecting rod, so that the movable part approaching the accommodating cavity drives the first clamping piece away from the accommodating cavity, and the movable part away from the accommodating cavity drives the first clamping piece close to the accommodating cavity, and a transmission piece is provided between the second clamping piece and the movable part, and the transmission piece includes a first transmission rod, The gear and the second transmission rod, the first transmission rod and the second transmission rod are both provided with a latching tooth that matches the gear, one end of the first transmission rod is fixedly connected to the movable part, and one end of the second transmission rod is fixedly connected to the second clamping member, the main body is provided with a limiting groove for accommodating the first transmission rod and the second transmission rod, so that the first transmission rod and the second transmission rod can move along the same moving direction as the movable part, and the movable part approaching the accommodating cavity drives the first transmission rod to approach the accommodating cavity, and the first transmission rod drives the second transmission rod away from the accommodating cavity through the gear, and then drives the second clamping member away from the accommodating cavity, and the movable part moving away from the accommodating cavity drives the first transmission rod away from the accommodating cavity, and the first transmission rod drives the second transmission rod to approach the accommodating cavity through the gear, and then drives the second clamping member to approach the accommodating cavity, and the movable part moving to the position farthest from the accommodating cavity causes the first clamping member and the second clamping member to clamp the connecting ball located in the accommodating cavity.

[0034] The present application provides a main body and a movable part on the ball head connecting piece, and provides a first clamping piece and a second clamping piece on both sides of the accommodating cavity. During use, the connecting ball can be set on the tractor and the ball head connecting piece can be set on the RV. When the tractor pulls the RV forward, the movable part is pulled to the position farthest from the accommodating cavity. At this time, the movable part uses the connecting rod to pull the first clamping piece, so that the first clamping piece and the connecting ball in the accommodating cavity are in close contact. At the same time, the movable part uses the transmission part to push the second clamping piece, so that the second clamping piece and the connecting ball in the accommodating cavity are in close contact, so that the first clamping piece and the second clamping piece clamp the connecting ball, thereby ensuring the connection stability between the tractor and the RV. When the tractor brakes, the RV The movable portion continues to move under the action of inertia, causing it to move within the hollow cavity and press against the buffer spring, thereby reducing the impact at the connection between the RV and the ball connector. At the same time, the movable portion drives the first transmission rod to move toward the accommodating cavity. The moving first transmission rod drives the gear to rotate through the latching teeth. The rotating gear drives the second transmission rod to move away from the accommodating cavity, which in turn drives the second clamping member to move away from the accommodating cavity, that is, to move away from the connecting ball, thereby preventing the connecting ball from being subjected to a large instantaneous impact. This reduces both the impact at the RV and the ball connector and the impact at the connection between the connecting ball and the ball connector, effectively preventing the RV, the ball connector, and the connecting ball from being damaged by the impact. Furthermore, because the first clamping member and the second clamping member are respectively provided on both sides of the accommodating cavity, the connecting ball can also be arranged on the RV and the ball connector on the tractor, which can also achieve a buffering effect.

[0035] The specific structure of the connection device for a trailer-type RV of the present application is described below with reference to the accompanying drawings.

[0036] The first embodiment of this application:

[0037] like Figure 1 As shown, the connecting device of this embodiment includes a connecting ball 1 and a ball head connector 2. The connecting ball 1 can be set on a tractor, and the ball head connector 2 can be set on a motorhome. By connecting the connecting ball 1 and the ball head connector 2 together, the tractor can drive the motorhome to move.

[0038] like Figure 1As shown, specifically, the ball head connector 2 includes a main body 21 and a movable part 22. The main body 21 is provided with a receiving cavity 211 and a hollow cavity 212. The receiving cavity 211 is used to receive the connecting ball 1, and the movable part 22 is used to connect to the RV, and the movable part 22 can move relative to the main body 21. Specifically, the main body 21 is provided with a guide hole (not marked in the figure) connected to the hollow cavity 212. The diameter of the guide hole is smaller than the diameter of the hollow cavity 212, so that a stop wall is formed at the junction of the guide hole and the hollow cavity 212. The movable part 22 is arranged in the guide hole, and one end is located in the hollow cavity 212. The end of the movable part 22 located in the hollow cavity 212 is provided with a stop protrusion, which is used to abut against the stop wall to prevent the movable part 22 from separating from the main body 21. A buffer spring 23 is provided in the hollow cavity 212. One end of the buffer spring 23 is connected to the main body 21, and the other end is connected to the movable part 22.

[0039] Reference Figures 1 to 3As shown, the accommodating cavity 211 and the hollow cavity 212 are arranged along the axial direction of the main body 21, and the movable portion 22 moves along the axial direction of the main body 21. In other words, the accommodating cavity 211 and the hollow cavity 212 are arranged along the moving direction of the movable portion 22. Furthermore, a first guide groove 213 and a second guide groove 214 are respectively provided on both sides of the accommodating cavity 211 along the axial direction of the main body 21. The first guide groove 213 is located on the side of the accommodating cavity 211 away from the hollow cavity 212, and the second guide groove 214 is located on the side of the accommodating cavity 211 close to the hollow cavity 212. A first clamping member 24 is provided in the first guide groove 213 and can move in the first guide groove 213 in a direction close to or away from the accommodating cavity 211. A second clamping member 25 is provided in the second guide groove 214 and can move in the second guide groove 214 in a direction close to or away from the accommodating cavity 211. A connecting rod 26 is provided between the first clamping member 24 and the movable part 22. One end of the connecting rod 26 is fixedly connected to the first clamping member 24, and the other end of the connecting rod 26 is fixedly connected to the movable part 22. When the movable part 22 moves in the hollow cavity 212 toward the direction approaching the accommodating cavity 211, the first clamping member 24 can be driven to move in the direction away from the accommodating cavity 211 through the connecting rod 26. A transmission member 27 is provided between the second clamping member 25 and the movable portion 22. The transmission member 27 includes a first transmission rod 271, a gear 272 and a second transmission rod 273. One end of the first transmission rod 271 is fixedly connected to the movable portion 22, and the other end is provided with a latching tooth matching the gear 272. One end of the second transmission rod 273 is fixedly connected to the second clamping member 25, and the other end is provided with a latching tooth matching the gear 272. The main body 21 is provided with a limiting groove (not shown in the figure) for accommodating the first transmission rod 271 and the second transmission rod 273. When the movable portion 22 moves in the direction close to the accommodating cavity 211 in the hollow cavity 212, it can drive the first transmission rod 271 in the limiting groove. The movable portion 22 moves inwardly in the direction close to the accommodating chamber 211, and then uses the teeth to drive the gear 272 to rotate. The rotating gear 272 can interact with the teeth on the second transmission rod 273, thereby driving the second transmission rod 273 to move in the direction away from the accommodating chamber 211. When the movable portion 22 moves in the direction away from the accommodating chamber 211 in the hollow cavity 212, it can drive the first transmission rod 271 to move in the direction away from the accommodating chamber 211 in the limiting groove, and then uses the teeth to drive the gear 272 to rotate. The rotating gear 272 can interact with the teeth on the second transmission rod 273, thereby driving the second transmission rod 273 to move in the direction close to the accommodating chamber 211.

[0040] Continue to refer to Figures 1 to 3As shown, during the use of the connecting device, when the towing vehicle pulls the RV forward, the stop protrusion of the movable part 22 abuts against the stop wall, and the pulling force is transmitted to the RV through the main body 21 and the movable part 22, thereby driving the RV forward. At the same time, because the movable part 22 is at the farthest position from the accommodating cavity 211, the movable part 22 gives the first clamping member 24 a force pointing to the accommodating cavity 211 through the connecting rod 26, and gives the second clamping member 25 a force pointing to the accommodating cavity 211 through the transmission member 27, so that the first clamping member 24 and the second clamping member 25 clamp the connecting ball 1, ensuring the connection stability of the connecting ball 1 and the ball head connecting member 2. When the towing vehicle brakes, the RV continues to move under the action of inertia, so that the movable part 22 moves in the hollow cavity 212 toward the accommodating cavity 211. During the movement, the movable part 22 will press the buffer spring 23, thereby reducing the impact force between the RV and the ball head connecting member 2, and moving The movable part 22 drives the first transmission rod 271 to move in the limit groove in the direction close to the accommodating chamber 211, and then uses the latch teeth to drive the gear 272 to rotate. The rotating gear 272 can interact with the latch teeth on the second transmission rod 273, thereby driving the second transmission rod 273 to move in the direction away from the accommodating chamber 211, so that the second clamping member 25 is away from the connecting ball 1. At the same time, the movable movable part 22 drives the first clamping member 24 to move in the direction away from the accommodating chamber 211 through the connecting rod 26, so that the first clamping member 24 is away from the connecting ball 1, thereby avoiding a large impact force between the ball head connector 2 and the connecting ball 1 at the moment of braking, thereby reducing the impact force between the connecting ball 1 and the ball head connector 2. In other words, it not only reduces the impact between the RV and the ball head connector 2, but also reduces the impact between the connecting ball 1 and the ball head connector 2, effectively avoiding damage to the RV, the ball head connector 2 and the connecting ball 1 due to impact.

[0041] It should be noted that the ball head connector 2 may be provided on the tractor and the connecting ball 1 may be provided on the RV.

[0042] like Figure 1 As shown, preferably, a first spring 241 is provided between the first clamping member 24 and the main body 21, and when the first clamping member 24 clamps the connecting ball 1, the first spring 241 is in a compressed state, and a second spring 251 is provided between the second clamping member 25 and the main body 21, and when the second clamping member 25 clamps the connecting ball 1, the second spring 251 is in a compressed state.

[0043] It will be understood by those skilled in the art that, by providing the first spring 241 and the second spring 242, the first clamping member 24 is subjected to a force directed toward the accommodating cavity 211 given by the first spring 241, and the second clamping member 25 is subjected to a force directed toward the accommodating cavity 211 given by the second spring 251, thereby making the first clamping member 24 and the second clamping member 25 fit more closely with the connecting ball 1, so that the first clamping member 24 and the second clamping member 25 have a better clamping effect on the connecting ball 1.

[0044] It should be noted that a spring may be provided only between the first clamping member 24 and the main body 21 or only between the second clamping member 25 and the main body 21 , or no spring may be provided at both ends.

[0045] Reference Figure 1 As shown, the first clamping member 24 and the second clamping member 25 are provided with an arcuate surface on the side facing the accommodating cavity 211 that matches the shape of the connecting ball 1. In other words, when the first clamping member 24 and the second clamping member 25 clamp the connecting ball 1, their respective arcuate surfaces can closely fit the outer surface of the connecting ball 1, thereby improving the clamping effect on the connecting ball 1. In addition, elastic gaskets (not shown in the figure) are provided on the surfaces of the first clamping member 24 and the second clamping member 25 that contact the connecting ball 1, thereby improving the clamping effect of the first clamping member 24 and the second clamping member 25 on the connecting ball 1 and helping to further reduce the impact between the connecting ball 1 and the ball head connector 2.

[0046] It should be noted that the first clamping member 24 and the second clamping member 25 may not be provided with an arcuate surface, that is, they may directly contact the connecting ball 1 through a flat surface.

[0047] Reference Figure 2 and Figure 3 As shown, connecting rods 26 and transmission members 27 are provided on opposite sides of the movable portion 22, thereby further stabilizing the connection between the movable portion 22 and the first clamping member 24 and the second clamping member 25. Furthermore, the axes of the first transmission rod 271 and the second transmission rod 273 are located in the same horizontal plane, thereby reducing the vertical space occupied by the transmission member 27 and facilitating the simultaneous connection of the connecting rod 26 and the transmission member 27 with the movable portion 22.

[0048] It should be noted that, it is also possible to provide only one connecting rod 26 and one transmission member 27 , and to have the connecting rod 26 and the transmission member 27 be located on both sides of the movable portion 22 , respectively, which is also convenient for installation.

[0049] Combine Figures 1 to 3As shown, during the use of the connecting device of this embodiment, the connecting ball 1 can be set on the tractor, and the ball head connecting member 2 can be set on the RV so that the movable part 22 is connected to the RV. Then, the connecting ball 1 is installed in the accommodating cavity 211 of the ball head connecting member 2. In the process of the tractor pulling the RV forward, the stop protrusion of the movable part 22 abuts against the stop wall, and the pulling force is transmitted to the RV through the main body 21 and the movable part 22, thereby driving the RV forward. At the same time, the movable part 22 gives the first clamping member 24 a force pointing to the accommodating cavity 211 through the connecting rod 26, and gives the second clamping member 25 a force pointing to the accommodating cavity 211 through the transmission member 27, so that the first clamping member 24 and the second clamping member 25 clamp the connecting ball 1. When the tractor brakes, the RV continues to move under the action of inertia, so that the movable part 22 moves in the hollow cavity 212 toward the direction close to the accommodating cavity 211, and the movable part 2 During the movement, the buffer spring 23 is pressed against the moving part 2, thereby reducing the impact force between the RV and the ball joint 2, and the moving movable part 22 drives the first transmission rod 271 to move in the limit groove toward the accommodating cavity 211, and then drives the gear 272 to rotate by the latching teeth. The rotating gear 272 can interact with the latching teeth on the second transmission rod 273, thereby driving the second transmission rod 273 to move away from the accommodating cavity 211, so that the second clamping part 25 is away from the connecting ball 1. At the same time, the moving movable part 22 drives the first clamping part 24 to move away from the accommodating cavity 211 through the connecting rod 26, so that the first clamping part 24 is away from the connecting ball 1, thereby avoiding a large impact force between the ball joint 2 and the connecting ball 1 at the moment of braking. When the tractor starts again and moves forward, the first clamping part 24 and the second clamping part 25 will return to the state of clamping the connecting ball 1.

[0050] It can be understood by those skilled in the art that, by providing the main body 21 and the movable part 22 on the ball head connector 2, and providing the first clamping member 24 and the second clamping member 25 on both sides of the accommodating cavity 211, on the one hand, when the tractor tows the RV forward, the movable part 22 can maintain the first clamping member 24 and the second clamping member 25 in the position of clamping the connecting ball 1 through the connecting rod 26 and the transmission member 27, thereby ensuring the connection stability between the connecting ball 1 and the ball head connector 2; on the other hand, when the tractor brakes, the movable part 22 can It can reduce the impact force between the RV and the ball head connector 2 by pressing the buffer spring 23. At the same time, the movable part 22 can drive the first clamping part 24 and the second clamping part 25 away from the clamping connecting ball 1 through the connecting rod 26 and the transmission part 27, thereby helping to reduce the impact force between the connecting ball 1 and the ball head connector 2. In other words, it not only reduces the impact between the RV and the ball head connector 2, but also reduces the impact between the connecting ball 1 and the ball head connector 2, effectively avoiding damage to the RV, the ball head connector 2 and the connecting ball 1 due to impact.

[0051] The second embodiment of the present application:

[0052] like Figure 4 As shown, unlike the first embodiment, the connecting ball 1 of this embodiment is provided with a concave partially spherical clamping groove 11, and the first clamping member 24 and the second clamping member 25 are provided with a partially spherical guide surface on the side facing the connecting ball 1. When the first clamping member 24 and the second clamping member 25 clamp the connecting ball 1, the first clamping member 24 and the second clamping member 25 are partially embedded in the clamping groove 11.

[0053] Those skilled in the art will appreciate that, by providing the clamping groove 11 on the connecting ball 1, the first clamping member 24 and the second clamping member 25 can be embedded in the clamping groove 11, thereby improving the fixing effect of the connecting ball 1. In addition, by providing spherical guide surfaces on the first clamping member 24 and the second clamping member 25, the first clamping member 24 and the second clamping member 25 can be more easily embedded in the clamping groove 11.

[0054] It should be noted that the guide surfaces on the first clamping member 24 and the second clamping member 25 may also be planes, for example, the ends of the first clamping member 24 and the second clamping member 25 facing the connecting ball 1 may be conical.

[0055] So far, the technical solutions of the present application have been described in conjunction with the above multiple embodiments. However, it is easy for those skilled in the art to understand that the scope of protection of the present application is not limited to these specific embodiments. Without departing from the technical principles of the present application, those skilled in the art can split and combine the technical solutions in the above various embodiments, and can also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principles of the present application will fall within the scope of protection of the present application.

Claims

1. A connecting device for a trailer caravan, characterized in that: The cam is connected to the sliding member by a spring, and the cam has a first end fixed to the sliding member and a second end fixed to the sliding member so that the cam can move relative to the sliding member and the spring has a contact area which is fixed to the sliding member and a contact area which is fixed to the sliding member. The movable rod and the second transmission rod are both provided with a latching tooth that matches the gear, one end of the first transmission rod is fixedly connected to the movable part, and one end of the second transmission rod is fixedly connected to the second clamping member, and the main body is provided with a limiting groove for accommodating the first transmission rod and the second transmission rod, so that the first transmission rod and the second transmission rod can move along the same moving direction as the movable part, and the movable part approaching the accommodating cavity drives the first transmission rod to approach the accommodating cavity, the first transmission rod drives the second transmission rod away from the accommodating cavity through the gear, and then drives the second clamping member away from the accommodating cavity, and the movable part away from the accommodating cavity drives the first transmission rod away from the accommodating cavity, the first transmission rod drives the second transmission rod to approach the accommodating cavity through the gear, and then drives the second clamping member to approach the accommodating cavity, and the movable part moving to the position farthest away from the accommodating cavity causes the first clamping member and the second clamping member to clamp the connecting ball located in the accommodating cavity.

2. The connecting device for a trailer caravan according to claim 1, characterized in that: A first spring is provided between the first clamping member and the main body, and the first clamping member in contact with the connecting ball compresses the first spring, and / or, A second spring is provided between the second clamping member and the main body, and the second clamping member in contact with the connecting ball compresses the second spring.

3. The connecting device for a trailer caravan according to claim 1, characterized in that: The first clamping member and the second clamping member are provided with arc-shaped surfaces on one side facing the accommodating cavity. The arc-shaped surfaces match the shape of the connecting ball, thereby fitting with the surface of the connecting ball.

4. The connecting device for a trailer caravan according to claim 1, characterized in that: Elastic gaskets are provided on one side of the first clamping member and the second clamping member facing the accommodating cavity.

5. The connecting device for a trailer caravan according to claim 1, characterized in that: The connecting rods are provided on both sides of the movable portion and the first clamping member, and the transmission members are provided on both sides of the movable portion and the second clamping member.

6. The connecting device for a trailer caravan according to claim 5, characterized in that: The axes of the first transmission rod and the second transmission rod are located in the same horizontal plane.

7. The connecting device for a trailer caravan according to claim 1, characterized in that: The connecting ball is provided with clamping grooves corresponding to the first clamping member and the second clamping member respectively, and the movable part moved to the position farthest from the accommodating cavity enables the first clamping member and the second clamping member to be respectively embedded in the clamping grooves.

8. The connecting device for a trailer caravan according to claim 7, characterized in that: The sizes of the first clamping member and the second clamping member gradually increase from the side facing the accommodating cavity to the direction away from the accommodating cavity, thereby forming a guiding surface on the first clamping member and the second clamping member.

9. The connecting device for a trailer caravan according to claim 8, characterized in that: The guide surface is configured as a spherical surface.

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