Connecting device for tail pipe fitting

Abstract

The utility model provides a connecting device for a tail pipe fitting. The connecting device for the tail pipe fitting comprises a connecting pipe fitting, one end of the connecting pipe fitting is suitable for being inserted into a pipe fitting to be connected, and the side wall of the connecting pipe fitting is provided with a locking channel communicating with the interior of the connecting pipe fitting; the limiting assembly comprises a screwing component, a transmission component and a locking component, the transmission component is located in the connecting pipe fitting, the screwing component is in linkage with the locking component through the transmission component, the screwing component is screwed, at least part of the locking component extends out of the locking channel to abut against the pipe fitting to be connected, and the screwing component is reversely screwed, and the locking component is contained in the locking channel. According to the technical scheme, the problem that in the prior art, a bicycle support and a square pipe are prone to falling off due to a connecting device for a bicycle tail pipe fitting is solved.

Description

Technical Field

[0001] This utility model relates to the field of bicycle bracket technology, and more specifically, to a connecting device for a bicycle tail tube fitting. Background Technology

[0002] In recent years, bicycles have become increasingly popular. However, roads near residential areas such as cities are not very suitable for cycling, so people often need to travel to specific locations for cycling activities. Furthermore, a family may own two or three bicycles, which has led to the development of bicycle racks that can be mounted on cars to transport bicycles to specific locations.

[0003] The bicycle bracket needs to be connected to the vehicle. Generally, there is a 50mm x 50mm (or 2" x 2") square tube at the rear of the bicycle. The bracket can be inserted into the square tube for connection. However, there is a gap between the bicycle bracket and the square tube. This can lead to an unstable connection between the bicycle bracket and the square tube, which can cause the bicycle bracket and the square tube to easily detach. Utility Model Content

[0004] The main purpose of this utility model is to provide a connecting device for bicycle tail tubes to solve the problem that existing connecting devices for bicycle tail tubes can easily cause bicycle brackets and square tubes to fall off.

[0005] To achieve the above objectives, this utility model provides a connecting device for a vehicle rear pipe fitting, comprising: a connecting pipe fitting, one end of which is adapted to be inserted into the pipe fitting to be connected, and a locking channel communicating with the interior of the connecting pipe fitting on its side wall; and a limiting component, comprising a rotating component, a transmission component, and a locking component, wherein the transmission component is located inside the connecting pipe fitting, and the rotating component is linked to the locking component through the transmission component. When the rotating component is rotated, at least part of the locking component extends out of the locking channel and abuts against the pipe fitting to be connected. When the rotating component is rotated in the opposite direction, the locking component is retracted into the locking channel.

[0006] Furthermore, the limiting component also includes a linkage component, which is connected between the transmission component and the locking component. The transmission component is movably arranged along the extension direction of the connecting pipe, and the locking component is movably arranged in a direction that forms an angle with the extension direction of the connecting pipe. The transmission component drives the locking component to move through the linkage component.

[0007] Furthermore, the linkage component includes at least two connecting rods, which are spaced apart along the extension direction of the connecting pipe, and the two ends of each connecting rod are pivotally connected to the locking component and the transmission component respectively; and / or, the number of linkage components is at least two, which are spaced apart along the extension direction of the connecting pipe, and the two ends of each linkage component are pivotally connected to the locking component and the transmission component respectively, and any two linkage components, locking components and transmission components form a quadrilateral structure.

[0008] Furthermore, along the extension direction of the connecting pipe fitting, at least one side of the locking channel is provided with a stop, the stop is connected to the connecting pipe fitting, and the locking member and the stop are engaged in a stop-locking cooperation.

[0009] Furthermore, the connecting pipe is a square pipe, the locking channel is located at the corner of the square pipe, and the locking member has two abutting surfaces arranged at an angle, which are respectively adapted to abut against the two inner surfaces of the pipe to be connected that are arranged at an angle.

[0010] Furthermore, the connecting pipe fitting includes a pipe body and an installation component connected to one end of the pipe body. The screwing component includes: a screwing part located on the side of the installation component away from the pipe body; a connecting rod connected to the screwing part, the connecting rod extending into the pipe body and rotatingly engaging with the transmission component, the connecting rod threadedly engaging with the installation component, and the transmission component slidingly engaging with the pipe body.

[0011] Furthermore, an anti-detachment structure is provided at the end of the connecting rod, and the anti-detachment structure is located at one end of the transmission component away from the screwing part; the connecting device for the tail tube also includes an anti-rotation component, which is located on the outer periphery of the connecting rod and cooperates with the connecting rod to prevent rotation, and the anti-rotation component is located between the anti-detachment structure and the transmission component.

[0012] Furthermore, the connecting pipe fitting includes a pipe body and an installation component connected to one end of the pipe body. The screwing component includes: a screwing part located on the side of the installation component away from the pipe body; a connecting rod connected to the screwing part, the connecting rod extending into the pipe body and threadedly connected to the transmission component; and an anti-detachment structure provided at the end of the connecting rod, the anti-detachment structure being located on the side of the transmission component away from the screwing component.

[0013] Furthermore, the connecting device for the rear pipe fitting also includes: a mounting component, disposed on one circumferential side of the connecting pipe fitting; and a limiting component, one end of which is rotatably connected to the mounting component, and the other end of which can extend into or exit from the limiting hole provided on the pipe fitting to be connected.

[0014] Furthermore, the mounting components include: a base disposed on the connecting pipe; a connecting shaft mounted on the base, a limiting member located on the outer periphery of the connecting shaft and rotatably disposed relative to the connecting shaft; and a torsion spring located on the outer periphery of the connecting shaft, one end of the torsion spring abutting against the limiting member and the other end of the torsion spring abutting against the base, the torsion spring being used to provide an elastic force to keep the limiting member engaged with the limiting hole.

[0015] By applying the technical solution of this utility model, since the screwing component is linked to the transmission component and the locking component, the screwing component drives the transmission component to move, and the locking component can extend out of the locking channel to abut against the pipe to be connected. In this way, the connecting pipe can be fixed inside the pipe to be connected, which improves the safety and stability of the connection between the connecting pipe and the pipe to be connected, and avoids the phenomenon of unstable connection between the connecting pipe and the pipe to be connected, thereby avoiding the phenomenon of easy detachment between the connecting pipe and the pipe to be connected. By screwing the screwing component in the opposite direction, the transmission component is driven to move, so as to drive the locking component to retract into the locking channel. In this way, the connecting pipe and the pipe to be connected are no longer in abutting state, and the connecting pipe can be pulled out from the pipe to be connected, completing the disassembly process. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram showing the connection state of the connecting device for the tailpipe of this utility model is provided.

[0018] Figure 2 It shows Figure 1 A schematic diagram of the structure of the connecting device for the tailpipe (wherein, the pipe to be connected is not shown);

[0019] Figure 3 It shows Figure 1 Exploded view of the connecting device for the tailpipe fittings;

[0020] Figure 4 It shows Figure 1 Another exploded structural diagram of the connecting device for the tailpipe fittings;

[0021] Figure 5 It shows Figure 2 A schematic diagram of the connecting device for the rear pipe fittings of the vehicle (the locking component is housed in the locking channel);

[0022] Figure 6 It shows Figure 2 A schematic diagram of the connecting device for the tailpipe fittings of the vehicle (the locking member extends out of the locking channel);

[0023] Figure 7 It shows Figure 2 A cross-sectional view of the connecting device for the rear tube fittings (the locking component is housed in the locking channel);

[0024] Figure 8 It shows Figure 2A cross-sectional view of the connecting device for the rear tube of the vehicle (the locking member extends out of the locking channel).

[0025] The above figures include the following reference numerals:

[0026] 10. Connecting pipe fitting; 11. Locking channel; 12. Stop; 13. Pipe body; 14. Mounting component; 21. Tightening component; 211. Connecting rod; 212. Tightening part; 22. Transmission component; 23. Locking component; 231. Abutment surface; 24. Linkage component; 26. Anti-detachment structure; 25. Anti-rotation component; 50. Pipe fitting to be connected; 51. Limiting hole; 70. Mounting component; 71. Base; 72. Connecting shaft; 73. Torsion spring; 80. Limiting component; 81. First pin; 82. Second pin. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 8 As shown, an embodiment of this utility model provides a connecting device for a vehicle rear pipe fitting. The connecting device for a vehicle rear pipe fitting includes a connecting pipe fitting 10, one end of which is adapted to be inserted into a pipe fitting 50 to be connected. The side wall of the connecting pipe fitting 10 is provided with a locking channel 11 communicating with the interior of the connecting pipe fitting 10. A limiting component includes a rotating component 21, a transmission component 22, and a locking component 23. The transmission component 22 is located inside the connecting pipe fitting 10. The rotating component 21 is linked with the locking component 23 through the transmission component 22. When the rotating component 21 is rotated, at least part of the locking component 23 extends out of the locking channel 11 and abuts against the pipe fitting 50 to be connected. When the rotating component 21 is rotated in the opposite direction, the locking component 23 is housed in the locking channel 11.

[0029] In the above technical solution, since the screwing component 21 is linked with the locking component 23 through the transmission component 22, by screwing the screwing component 21, the transmission component 22 is driven to move, and the locking component 23 can extend out of the locking channel 11 to abut against the pipe to be connected 50. In this way, the connecting pipe 10 can be fixed inside the pipe to be connected 50, which improves the safety and stability of the connection between the connecting pipe 10 and the pipe to be connected 50, so as to avoid the phenomenon of unstable connection between the connecting pipe 10 and the pipe to be connected 50, thereby avoiding the phenomenon of easy detachment between the connecting pipe 10 and the pipe to be connected 50. By screwing the screwing component 21 in the opposite direction, the transmission component 22 is driven to move, so as to drive the locking component 23 to retract into the locking channel 11. In this way, the connecting pipe 10 and the pipe to be connected 50 are no longer in abutting state, and the connecting pipe 10 can be pulled out from the pipe to be connected 50, completing the disassembly process.

[0030] Specifically, in the embodiments of this utility model, the locking member 23 extends out of the locking channel 11 and abuts against the pipe to be connected 50, which can reduce the gap between the connecting pipe 10 and the pipe to be connected 50, and reduce the shaking and noise caused by the gap.

[0031] like Figures 1 to 8 As shown in the embodiment of this utility model, the limiting component further includes a linkage component 24, which is connected between the transmission component 22 and the locking component 23. The transmission component 22 is movably arranged along the extension direction of the connecting pipe 10 and along the direction that forms an angle with the extension direction of the connecting pipe 10. The locking component 23 is movably arranged in the locking channel 11. The transmission component 22 drives the locking component 23 to move through the linkage component 24.

[0032] In the above technical solution, the rotational motion of the screwing member 21 is converted into the movement of the transmission member 22 along the extension direction of the connecting pipe 10 by screwing the screwing member 21. The movement of the transmission member 22 is transmitted to the locking member 23 through the linkage member 24. Under the drive of the linkage member 24, the locking member 23 extends out from the locking channel 11 and abuts against the pipe 50 to be connected. In this way, the connecting pipe 10 can be fixed inside the pipe 50 to be connected. Since the movement direction of the locking member 23 is at an angle to the extension direction of the connecting pipe 10, this design allows the locking member 23 to effectively press the pipe to be connected when it extends. The inner wall of 50 increases the stability and tightness of the connection between the connecting pipe 10 and the pipe to be connected 50; by reverse rotating the rotating member 21, the transmission member 22 moves along the extension direction of the connecting pipe 10. The transmission member 22 drives the locking member 23 to move in a direction that is at an angle to the extension direction of the connecting pipe 10 through the linkage member 24, so as to drive the locking member 23 to retract into the locking channel 11. When the locking member 23 is housed in the locking channel 11, the locking connection between the connecting pipe 10 and the pipe to be connected 50 is released, and the connecting pipe 10 can be pulled out from the pipe to be connected 50, completing the disassembly process.

[0033] Specifically, in the embodiments of this utility model, by setting a linkage component 24, the linear motion of the transmission component 22 can be converted into the motion of the locking component 23 in a direction that is set at an angle to the extension direction of the connecting pipe 10. This design not only increases the reliability and stability of the connection, but also enables precise adjustment of the gap between the connecting pipe 10 and the pipe to be connected 50, making the connection of the connecting pipe 10 and the pipe to be connected 50 more convenient.

[0034] like Figures 1 to 8 As shown in the embodiment of this utility model, the linkage component 24 includes at least two connecting rods. Along the extension direction of the connecting pipe 10, at least two connecting rods are spaced apart, and the two ends of each connecting rod are pivotally connected to the locking component 23 and the transmission component 22, respectively.

[0035] In the above technical solution, by rotating the rotating member 21, the rotational motion of the rotating member 21 is converted into the linear motion of the transmission member 22 along the extension direction of the connecting pipe 10. The movement of the transmission member 22 pushes the locking member 23 to move in a direction that is at an angle to the extension direction of the connecting pipe 10 through the rotation of at least two connecting rods. Since at least two connecting rods are spaced apart, these connecting rods will work together to make the locking member 23 stably extend from the locking channel 11 and abut against the pipe 50 to be connected. In this way, the connecting pipe 10 can be fixed in the pipe 50 to be connected. By rotating the rotating member 21 in the opposite direction, the transmission member 22 moves along the extension direction of the connecting pipe 10. The movement of the transmission member 22 pulls the locking member 23 back into the locking channel 11 through at least two connecting rods. When the locking member 23 is completely retracted into the locking channel 11, the connection between the connecting pipe 10 and the pipe 50 to be connected is released, and the connecting pipe 10 can be pulled out from the pipe 50 to be connected, completing the disassembly process.

[0036] like Figures 1 to 8 As shown in the embodiment of this utility model, the number of linkage components 24 is at least two. Along the extension direction of the connecting pipe 10, at least two linkage components 24 are spaced apart, and the two ends of each linkage component 24 are pivotally connected to the locking component 23 and the transmission component 22 respectively. Any two linkage components 24, locking component 23 and transmission component 22 form a quadrilateral structure.

[0037] In the above technical solution, since any two linkage components 24, locking components 23 and transmission components 22 form a quadrilateral structure, the linear movement of the transmission component 22 along the extension direction of the connecting pipe 10 can be converted into the movement of the locking component 23 along a direction that is at an angle to the extension direction of the connecting pipe 10.

[0038] like Figures 1 to 8 As shown in the embodiment of this utility model, along the extension direction of the connecting pipe 10, at least one side of the locking channel 11 is provided with a stop 12, the stop 12 is connected to the connecting pipe 10, and the locking member 23 cooperates with the stop 12.

[0039] In the above technical solution, by rotating the rotating component 21, the transmission component 22 will move linearly along the extension direction of the connecting pipe 10. Under the action of the stop component 12, the locking component 23 cannot continue to move with the transmission component 22 after hitting the stop component 12. The linkage component 24 will swing relative to the transmission component 22, thereby driving the locking component 23 to extend or retract into the locking channel in a direction that is at an angle to the extension direction of the connecting pipe 10.

[0040] Specifically, in the embodiments of this utility model, the stop member 12 is a plate-shaped structure, and one side edge of the plate-shaped structure is fixedly connected to the side wall of the connecting pipe 10.

[0041] Preferably, in the embodiment of this utility model, there are two stop members 12, and the two stop members 12 are respectively disposed on both sides of the locking channel 11.

[0042] Specifically, when the screwing member 21 drives the transmission member 22 and the locking member 23 to move together toward the locking channel, the locking member 23 will hit the stop member 12 and cannot continue to move, but the transmission member 22 continues to move. At this time, the quadrilateral opens and the locking member 23 extends.

[0043] like Figures 1 to 8 As shown in the embodiment of this utility model, the connecting pipe 10 is a square pipe, the locking channel 11 is provided at the corner of the square pipe, and the locking member 23 has two abutting surfaces 231 arranged at an angle. The two abutting surfaces 231 are respectively adapted to abut against the two inner surfaces of the pipe 50 to be connected at an angle.

[0044] In the above technical solution, the two abutting surfaces 231 of the locking member 23 abut against the two inner surfaces of the pipe fitting 50 to be connected, so that the locking member 23 is in surface contact with the pipe fitting 50 to be connected, which can distribute the force in two directions, improve the stability and reliability of the connection between the locking member 23 and the pipe fitting 50 to be connected, and reduce the shaking caused by unidirectional force.

[0045] Furthermore, in the embodiments of this utility model, the two abutting surfaces 231 of the locking member 23 can quickly abut against the pipe fitting 50 to be connected without a complicated adjustment or alignment process, which simplifies the operation process and improves the convenience of operation.

[0046] like Figures 1 to 6 As shown, the connecting pipe fitting 10 includes a pipe body 13 and a mounting member 14 connected to one end of the pipe body 13. The screwing member 21 includes: a screwing part 212 located on the side of the mounting member 14 away from the pipe body 13; a connecting rod 211 connected to the screwing part 212, the connecting rod 211 extending into the pipe body 13 and rotatingly engaging with the transmission member 22, the transmission member 22 slidingly engaging with the pipe body 13, and the connecting rod 211 threadedly engaging with the mounting member 14.

[0047] In the above technical solution, the connecting rod 211 is rotated by manually rotating the screwing part 212. Since there is a threaded fit between the connecting rod 211 and the mounting part 14, the rotational movement of the connecting rod 211 will be converted into linear movement along the extension direction of the tube body 13, thereby causing the transmission component 22 to move towards the locking channel 11 along the extension direction of the tube body 13.

[0048] Specifically, in the embodiments of this utility model, the connecting rod 211 and the screwing part 212 are integrally formed.

[0049] Specifically, in the embodiments of this utility model, the mounting component 14 is a mounting plate.

[0050] like Figures 2 to 4 As shown in the embodiment of this utility model, the end of the connecting rod 211 is provided with an anti-detachment structure 26, which is located at one end of the transmission member 22 away from the screwing part 212; the pipe fitting connecting device also includes an anti-rotation member 25, which is located on the outer periphery of the connecting rod 211 and cooperates with the connecting rod 211 to prevent rotation, and the anti-rotation member 25 is located between the anti-detachment structure 26 and the transmission member 22.

[0051] In the above technical solution, on the one hand, by setting the anti-detachment structure 26, the connecting rod 211 can be prevented from detaching from the inside of the transmission component 22 during operation; on the other hand, the anti-rotation component 25 cooperates with the anti-rotation of the connecting rod 211. The anti-rotation component 25 is located between the anti-detachment structure 26 and the transmission component 22. During the rotation of the connecting rod 211, the anti-rotation component 25 can prevent the anti-detachment structure 26 from contacting the rotating transmission component 22, thereby preventing the anti-detachment structure 26 from becoming loose.

[0052] Specifically, in the embodiments of this utility model, the anti-rotation component 25 is an anti-rotation washer, and the anti-loosening structure 26 is a nut.

[0053] like Figures 1 to 8 As shown, in another embodiment of the present invention, the connecting pipe 10 includes a pipe body 13 and an mounting member 14 connected to one end of the pipe body 13. The screwing member 21 includes a screwing part 212 located on the side of the mounting member 14 away from the pipe body 13. A connecting rod 211 is connected to the screwing part 212. The connecting rod 211 extends into the pipe body 13 and is threadedly connected to the transmission member 22. An anti-detachment structure 26 is provided at the end of the connecting rod 211. The anti-detachment structure 26 is provided on the side of the transmission member 22 away from the screwing member 21.

[0054] In the above technical solution, by rotating the screwing part 212, the rotation of the screwing part 212 will drive the connecting rod 211 to rotate inside the tube body 13. Since the transmission component 22 and the connecting rod 211 are threadedly connected, the transmission component 22 moves along the axial direction of the tube body 13. Through the action of the linkage component 24, the locking component 23 will extend out of the locking channel at an angle to the extension direction of the connecting tube 10 and abut against the tube 50 to be connected; or, the locking component 23 will retract into the locking channel at an angle to the extension direction of the connecting tube 10 and release the abutment from the tube 50 to be connected.

[0055] like Figures 1 to 6As shown in the embodiment of this utility model, the pipe fitting 50 to be connected is provided with a limiting hole 51. The pipe fitting connecting device further includes: an installation member 70, which is disposed on one side of the circumferential direction of the connecting pipe fitting 10; and a limiting member 80, one end of which is rotatably connected to the installation member 70, and the other end of which can extend into or out of the limiting hole 51.

[0056] In the above technical solution, when it is necessary to connect the connecting pipe 10 to the pipe 50 to be connected, the limiting member 80 is rotated so that the other end of the limiting member 80 extends into the limiting hole 51 of the pipe 50 to be connected, thereby limiting the connection between the connecting pipe 10 and the pipe 50 to be connected. The cooperation between the limiting member 80 and the limiting hole 51 can not only prevent the connecting pipe 10 from loosening in the axial direction, but also prevent the connecting pipe 10 and the pipe 50 to be connected from rotating relative to each other due to external forces, so as to improve the stability of the connection. When it is necessary to disassemble the connecting pipe 10, the limiting member 80 is rotated so that the other end of the limiting member 80 is dislodged from the limiting hole 51. In this way, the connecting pipe 10 can be pulled out from the pipe 50 to be connected, completing the disassembly process.

[0057] Specifically, in the embodiments of this utility model, the limiting member 80 includes a first pin 81 and a second pin 82 that are connected and set at an angle. The first pin 81 is limited and engaged with the limiting hole 51, and the second pin 82 is rotatably connected to the mounting member 70.

[0058] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown in the embodiment of this utility model, the mounting component 70 includes a base 71 disposed on the connecting pipe 10; a connecting shaft 72 mounted on the base 71; a limiting component 80 located on the outer periphery of the connecting shaft 72 and rotatably disposed relative to the connecting shaft 72; and a torsion spring 73 located on the outer periphery of the connecting shaft 72, one end of the torsion spring 73 abutting against the limiting component 80, and the other end of the torsion spring 73 abutting against the base 71. The torsion spring 73 is used to provide an elastic force to keep the limiting component 80 and the limiting hole 51 in cooperation.

[0059] In the above technical solution, by setting a torsion spring 73, when the connecting pipe 10 needs to be connected to the pipe 50 to be connected, the limiting member 80 will be subjected to an elastic force that maintains a fit with the limiting hole 51, so that the limiting member 80 automatically aligns and extends into the limiting hole 51, thereby realizing the connection between the connecting pipe 10 and the pipe 50 to be connected, and preventing the connecting pipe 10 and the pipe 50 to be connected from separating. When the connecting pipe 10 needs to be disassembled, the user needs to manually operate the limiting member 80 to overcome the elastic force of the torsion spring 73, so that the limiting member 80 is disengaged from the limiting hole 51. The rotational connection between the limiting member 80 and the connecting shaft 72 allows the user to disengage from the limiting hole 51 by rotating the limiting member 80. When one end of the limiting member 80 disengages from the limiting hole 51, the elastic force of the torsion spring 73 will bring the limiting member 80 closer to the connecting pipe 10, so as to prepare for the next connection operation.

[0060] Specifically, in the embodiments of this utility model, the base 71 is a pin seat and the connecting shaft 72 is a knurled pin.

[0061] From the above description, it can be seen that the above embodiments of this utility model achieve the following technical effects: Since the screwing component is linked with the transmission component and the locking component, by screwing the screwing component, the transmission component is driven to move, and the locking component can extend out of the locking channel to abut against the pipe to be connected. In this way, the connecting pipe can be fixed inside the pipe to be connected, which improves the safety and stability of the connection between the connecting pipe and the pipe to be connected, so as to avoid the phenomenon of unstable connection between the connecting pipe and the pipe to be connected, thereby avoiding the phenomenon of easy detachment between the connecting pipe and the pipe to be connected. By screwing the screwing component in the opposite direction, the transmission component is driven to move, so as to drive the locking component to retract into the locking channel. In this way, the connecting pipe and the pipe to be connected are no longer in the abutting state, and the connecting pipe can be pulled out from the pipe to be connected, completing the disassembly process.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A connecting device for a vehicle rear pipe fitting, characterized in that, include: A connecting pipe fitting (10) is provided, one end of which is adapted to be inserted into the pipe fitting (50) to be connected, and the side wall of the connecting pipe fitting (10) is provided with a locking channel (11) communicating with the interior of the connecting pipe fitting (10); The limiting component includes a screwing member (21), a transmission member (22), and a locking member (23). The transmission member (22) is located inside the connecting pipe (10). The screwing member (21) is linked with the locking member (23) through the transmission member (22). When the screwing member (21) is screwed, at least part of the locking member (23) extends out of the locking channel (11) and abuts against the pipe to be connected (50). When the screwing member (21) is screwed in the opposite direction, the locking member (23) is housed in the locking channel (11).

2. The connecting device for the rear pipe fitting according to claim 1, characterized in that, The limiting component also includes a linkage component (24), which is connected between the transmission component (22) and the locking component (23). The transmission component (22) is movably arranged along the extension direction of the connecting pipe (10) and along a direction that is at an angle to the extension direction of the connecting pipe (10). The locking component (23) is movably arranged in the locking channel (11). The transmission component (22) drives the locking component (23) to move through the linkage component (24).

3. The connecting device for the rear pipe fitting according to claim 2, characterized in that, The linkage component (24) includes at least two connecting rods. Along the extension direction of the connecting pipe (10), at least two connecting rods are spaced apart, and the two ends of each connecting rod are pivotally connected to the locking component (23) and the transmission component (22), respectively. And / or, The number of linkage components (24) is at least two. Along the extension direction of the connecting pipe (10), at least two linkage components (24) are spaced apart, and the two ends of each linkage component (24) are pivotally connected to the locking component (23) and the transmission component (22) respectively. Any two linkage components (24), the locking component (23) and the transmission component (22) form a quadrilateral structure.

4. The connecting device for the rear pipe fitting according to any one of claims 1 to 3, characterized in that, Along the extension direction of the connecting pipe (10), at least one side of the locking channel (11) is provided with a stop (12), the stop (12) is connected to the connecting pipe (10), and the locking member (23) is in stop cooperation with the stop (12).

5. The connecting device for the rear pipe fitting according to any one of claims 1 to 3, characterized in that, The connecting pipe (10) is a square pipe, the locking channel (11) is located at the corner of the square pipe, and the locking member (23) has two abutting surfaces (231) arranged at an angle. The two abutting surfaces (231) are respectively adapted to abut against the two inner surfaces of the pipe to be connected (50) arranged at an angle.

6. The connecting device for a vehicle rear pipe fitting according to any one of claims 1 to 3, characterized in that, The connecting pipe fitting (10) includes a pipe body (13) and a mounting member (14) connected to one end of the pipe body (13), and the screwing member (21) includes: The screwing part (212) is located on the side of the mounting part (14) opposite to the tube body (13); The connecting rod (211) is connected to the screwing part (212). The connecting rod (211) extends into the tube body (13) and rotates with the transmission component (22). The connecting rod (211) is threaded with the mounting part (14). The transmission component (22) slides with the tube body (13).

7. The connecting device for the rear pipe fitting according to claim 6, characterized in that, The end of the connecting rod (211) is provided with an anti-detachment structure (26), which is located at the end of the transmission member (22) away from the screwing part (212); The connecting device for the tail section also includes an anti-rotation component (25), which is located on the outer periphery of the connecting rod (211) and engages with the connecting rod (211) to prevent rotation. The anti-rotation component (25) is located between the anti-detachment structure (26) and the transmission component (22).

8. The connecting device for a vehicle tailpipe according to any one of claims 1 to 3, characterized in that, The connecting pipe fitting (10) includes a pipe body (13) and a mounting component (14) connected to one end of the pipe body (13), and the screwing component (21) includes: The screwing part (212) is located on the side of the mounting part (14) opposite to the tube body (13); A connecting rod (211) is connected to the screwing part (212). The connecting rod (211) extends into the tube body (13) and is threadedly connected to the transmission member (22). An anti-detachment structure (26) is provided at the end of the connecting rod (211). The anti-detachment structure (26) is provided on the side of the transmission member (22) away from the screwing member (21).

9. The connecting device for a vehicle rear pipe fitting according to any one of claims 1 to 3, characterized in that, The connecting device for the rear pipe fitting also includes: The mounting component (70) is disposed on one circumferential side of the connecting pipe (10); A limiting member (80) is provided, one end of which is rotatably connected to the mounting member (70), and the other end of which can extend into or exit the limiting hole (51) provided on the pipe to be connected (50).

10. The connecting device for the rear pipe fitting according to claim 9, characterized in that, The mounting component (70) includes: A base (71) is disposed on the connecting pipe fitting (10); A connecting shaft (72) is mounted on the base (71), and the limiting member (80) is located on the outer periphery of the connecting shaft (72) and is rotatably disposed relative to the connecting shaft (72); A torsion spring (73) is located on the outer periphery of the connecting shaft (72). One end of the torsion spring (73) abuts against the limiting member (80), and the other end of the torsion spring (73) abuts against the base (71). The torsion spring (73) is used to provide an elastic force to keep the limiting member (80) and the limiting hole (51) engaged.

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