A hemming device

Abstract

This invention relates to the field of automotive manufacturing technology, specifically to a locking device for locking the wheel end nut of a drive shaft in an automotive transmission system. The device includes an upper control arm, a lower support, a sleeve, a pressure head, a top block, and a drive component. The upper control arm and lower support are hinged to form a hinge area. The sleeve is located between the upper control arm and the lower support. The wheel end nut of the drive shaft is placed inside the sleeve, and the sleeve can limit the position of the drive shaft end to lock the wheel end nut. The pressure head is located at the end of the upper control arm facing the sleeve, and the top block is located on the opposite side of the hinge area opposite the sleeve. The top block is connected to the output end of the drive component, and the drive component can drive the top block to move along the length of the lower support, thereby causing the upper control arm to rotate relative to the lower support along the hinge area. The locking device provided by this invention replaces manual tool use for locking, reduces process cycle time, improves production efficiency, reduces the labor intensity of workers, and effectively avoids misalignment during the locking process when the anti-loosening groove is engaged.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing technology, and more specifically to a seam locking device. Background Technology

[0002] As the automotive industry gradually shifts from gasoline-powered vehicles to new energy vehicles, the output torque and response time of electric motors have significantly improved compared to gasoline vehicles. Simultaneously, with increasingly aggressive driving habits, the end effector of traditional systems is experiencing greater torque and impact. Under these conditions, loosening of the drive shaft wheel end nuts can occur frequently.

[0003] Currently, a common method to prevent wheel end nuts from loosening is to lock the flanges. There are two existing locking methods: the first involves manually hammering the nut flange into the anti-loosening groove; the second involves workers using a manual clamp to deform the nut flange and force it into the groove. Both methods require manual locking with tools, increasing the process time and worker workload. Furthermore, the lack of precise positioning during locking makes it easy for the nut to misalign with the groove. Summary of the Invention

[0004] (i) The technical problem to be solved by the present invention is that the wheel end nut of the existing drive shaft is manually edged, which increases the cycle time of the process and also increases the labor intensity of the workers. At the same time, there is no positioning during the edge-locking process, which makes it easy to lock the groove off-center.

[0005] (II) Technical Solution

[0006] To solve the above-mentioned technical problems, embodiments of the present invention provide a locking device for locking the wheel end nut of the drive shaft of an automobile transmission system, including an upper swing arm, a lower bracket, a sleeve, a pressure head, a top block, and a driving component;

[0007] The upper swing arm and the lower bracket are hinged to form a hinge area. The sleeve is located between the upper swing arm and the lower bracket. The rod end of the drive shaft is provided with the wheel end nut and placed inside the sleeve. The sleeve can limit the rod end of the drive shaft to lock the edge of the wheel end nut.

[0008] The pressure head is located at one end of the upper swing arm facing the sleeve, and the top block is located on the other side of the hinge area opposite to the sleeve. The top block is connected to the output end of the drive member, and the drive member can drive the top block to move along the length direction of the lower bracket, so as to drive the upper swing arm to rotate relative to the lower bracket along the hinge area.

[0009] Furthermore, the lower support is provided with a groove, and a roller is provided in the groove. The roller is connected to the side wall of the groove through a first rotating shaft, and the bottom surface of the top block is in contact with the outer wall surface of the roller.

[0010] The top block has a series of inclined surfaces and a flat surface on the side facing the upper swing arm. The upper swing arm has a mounting groove at the end opposite to the pressure head. A rotating wheel is provided in the mounting groove. The rotating wheel is connected to the side wall of the mounting groove through a second rotating shaft. The rotating wheel can move along the inclined surface and the flat surface.

[0011] Furthermore, the lower support has a bottom shell on its outer side, and the top block is located inside the bottom shell.

[0012] Furthermore, an upper protective cover is provided above the bottom shell, and the upper protective cover covers the outer side of the upper swing arm;

[0013] A buffer spring is fixedly provided on the inner wall surface of the upper shield facing the upper swing arm, and the end of the buffer spring away from the upper shield abuts against the upper surface of the upper swing arm.

[0014] Furthermore, the upper cover has a screw hole, the threaded end of the screw passes through the screw hole and is located on the side of the upper cover facing the upper swing arm, and the buffer spring is sleeved on the threaded end of the screw.

[0015] Furthermore, the end of the upper swing arm away from the rotating wheel is provided with a positioning groove, the opening of the positioning groove faces the sleeve, and the pressure head is installed in the positioning groove by positioning bolts.

[0016] Furthermore, an adjusting shim is provided between the upper top wall of the pressure head and the inner bottom wall of the positioning groove.

[0017] Furthermore, the lower bracket has a mounting hole, and the sleeve has a threaded hole at the position corresponding to the mounting hole. The mounting bolt passes through the mounting hole and is threaded into the threaded hole.

[0018] Furthermore, the inner bottom wall of the sleeve is provided with a positioning block, which can engage with the anti-loosening groove at the end of the drive shaft to limit the drive shaft.

[0019] Furthermore, the upper swing arm is provided with a first connecting ear, the first connecting ear having a first rotating hole, the lower support is provided with a second connecting ear, the second connecting ear having a second rotating hole, the first connecting ear and the second connecting ear are alternately arranged to form the hinge area, and the third rotating shaft passes through the first rotating hole and the second rotating hole in sequence.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a locking device for locking the wheel end nut of a drive shaft in an automotive transmission system. It includes an upper control arm, a lower support, a sleeve, a pressure head, a top block, and a driving component. The upper control arm and the lower support are hinged, forming a hinge area at the hinge point. This allows the upper control arm to rotate relative to the lower support around the hinge area. A sleeve is provided on one side of the hinge area, located between the upper and lower control arms. In use, the wheel end nut is fitted onto the end of the drive shaft and placed inside the sleeve. The driving component drives the top block on the other side of the hinge area to move along the length of the lower support, thereby lifting the upper control arm. This causes the upper control arm to press down towards the pressure head located at the end of the sleeve, completing the locking process. This replaces manual locking with tools, reducing process cycle time, improving production efficiency, and reducing worker labor intensity. Simultaneously, the sleeve also limits the end of the drive shaft for locking the wheel end nut, effectively preventing misalignment during the locking process when the anti-loosening groove is engaged. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the edge-locking device provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the edge-locking process of the edge-locking device provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the lower support structure of the locking device provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the upper swing arm of the locking device provided in an embodiment of the present invention along the first direction;

[0027] Figure 5 This is a schematic diagram of the upper swing arm of the locking device provided in an embodiment of the present invention along the second direction;

[0028] Figure 6 This is a schematic diagram of the upper protective cover structure of the locking device provided in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the locking device before locking provided in an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the edge-locking device after edge-locking provided in an embodiment of the present invention.

[0031] icon:

[0032] 100 - Drive shaft; 101 - Wheel end nut; 102 - Anti-loosening groove;

[0033] 200-Upper swing arm; 2001-Mounting groove; 2002-Positioning groove; 2003-First connecting ear; 201-Lower bracket; 2011-Groove; 2012-Second connecting ear; 202-Sleeve; 2021-Positioning block; 203-Pressure head; 204-Top block; 2041-Ceiling surface; 2042-Flat surface;

[0034] 300 - Roller; 301 - First shaft; 302 - Roller; 303 - Second shaft; 304 - Adjusting shim; 305 - Mounting bolt; 306 - Third shaft;

[0035] 400 - Bottom shell; 401 - Upper cover; 402 - Buffer spring; 403 - Screw. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] Example 1

[0040] like Figures 1 to 8 As shown, the present invention provides a locking device for locking the wheel end nut 101 of the drive shaft 100 of an automobile transmission system, including an upper swing arm 200, a lower bracket 201, a sleeve 202, a pressure head 203, a top block 204 and a driving component;

[0041] The upper swing arm 200 and the lower bracket 201 are hinged to form a hinge area. The sleeve 202 is located between the upper swing arm 200 and the lower bracket 201. The rod end of the drive shaft 100 is provided with a wheel end nut 101 and placed inside the sleeve 202. The sleeve 202 can limit the rod end of the drive shaft 100 to lock the edge of the wheel end nut 101.

[0042] The pressure head 203 is located at one end of the upper swing arm 200 facing the sleeve 202, and the top block 204 is located on the other side of the hinge area opposite to the sleeve 202. The top block 204 is connected to the output end of the drive member. The drive member can drive the top block 204 to move along the length direction of the lower bracket 201, so as to drive the upper swing arm 200 to rotate relative to the lower bracket 201 along the hinge area.

[0043] In this embodiment, the locking device includes an upper swing arm 200, a lower support 201, a sleeve 202, a pressure head 203, a top block 204, and a driving component. The upper swing arm 200 and the lower support 201 are hinged, forming a hinge area at the hinge point, thereby facilitating the rotation of the upper swing arm 200 relative to the lower support 201 around the hinge area. A sleeve 202 is provided on one side of the hinge area, located between the upper swing arm 200 and the lower swing arm. In use, the wheel end nut 101 is sleeved on the rod end of the drive shaft 100 and placed inside the sleeve 202, and driven... The component drives the top block 204 on the other side of the hinge area to move along the length of the lower bracket 201, thereby lifting the upper swing arm 200. This causes the upper swing arm 200 to press down toward the pressure head 203 at the end of the sleeve 202 to complete the edge locking. This replaces manual edge locking with tools, reduces the cycle time of the process, improves production efficiency, and reduces the labor intensity of workers. At the same time, the sleeve 202 can also limit the rod end of the drive shaft 100 to lock the wheel end nut 101, effectively preventing the anti-loosening groove 102 from locking off during the edge locking process.

[0044] Optionally, the driving component can be a cylinder, hydraulic cylinder, electric cylinder, or motor, etc., to replace manual pushing, which can effectively reduce the labor intensity of workers.

[0045] According to one embodiment provided by the present invention, such as Figure 1 , Figure 4 , Figure 5 , Figure 7 and Figure 8As shown, the lower support 201 is provided with a groove 2011, and a roller 300 is provided in the groove 2011. The roller 300 is connected to the side wall of the groove 2011 through the first rotating shaft 301, and the bottom surface of the top block 204 is in contact with the outer wall surface of the roller 300.

[0046] The top block 204 has an inclined surface 2041 and a flat surface 2042 connected in sequence on the side facing the upper swing arm 200. The upper swing arm 200 is provided with a mounting groove 2001 at the end opposite to the pressure head 203. A rotating wheel 302 is provided in the mounting groove 2001. The rotating wheel 302 is connected to the side wall of the mounting groove 2001 through a second rotating shaft 303. The rotating wheel 302 can move along the inclined surface 2041 and the flat surface 2042.

[0047] In this embodiment, a groove 2011 is provided on the side of the lower support 201 opposite to the sleeve 202. A rotating hole is provided on the side wall of the groove 2011. The roller 300 is connected to the side wall of the groove 2011 through the first rotating shaft 301. The top block 204 is located above the roller 300, that is, the bottom surface of the top block 204 is in contact with the outer wall surface of the roller 300. The roller 300 can drive the top block 204 to move along the length direction of the lower support 201. In order to ensure the stability of the movement of the top block 204, two rollers 300 are provided. The two rollers 300 are arranged at intervals along the length direction of the lower support 201. At the same time, in order to ensure the smooth rotation of the first rotating shaft 301, a bearing is also provided between the first rotating shaft 301 and the rotating hole.

[0048] The upper swing arm 200 has a mounting groove 2001 at the end opposite to the pressure head 203. The mounting groove 2001 is used to mount the rotating wheel 302. A rotating hole is opened in the side wall of the mounting groove 2001. The rotating wheel 302 is connected to the side wall of the mounting groove 2001 through the second rotating shaft 303. In order to realize the locking action of the wheel end nut 101, the top block 204 is pushed forward by the driving component. Its surface contacts the rotating wheel 302, and the rotating wheel 302 rolls on it to push the upper swing arm 200 to swing. The rotation limits the swing amplitude of the upper swing arm 200. The surface contour design, namely the inclined surface 2041 and the plane 2042 connected to the side of the top block 204 facing the upper swing arm 200, can precisely control the downward stroke of the pressure head 203. When the rotating wheel 302 is in contact with the plane 2042, the pressure head 203 is pressed down to the position. At this time, the top block 204 continues to move forward, and at the same time, the rotating wheel 302 is in contact with the tail end of the plane 2042. The rotation of the upper swing arm 200 can control the downward pressure of the pressure head 203. By setting the length of the plane 2042, the problem of insufficient edge locking depth or crushing and cracking can be effectively avoided.

[0049] According to one embodiment provided by the present invention, such as Figure 2 , Figure 7 and Figure 8As shown, the lower support 201 has a bottom shell 400 on its outer side, and the top block 204 is located inside the bottom shell 400.

[0050] In this embodiment, in order to facilitate the driving member to push the top block 204 to move along the length direction of the lower bracket 201, a bottom shell 400 is provided on the outer side of the lower bracket 201, and the top block 204 is placed inside the bottom shell 400. The bottom shell 400 limits the movement path of the top block 204. At the same time, it is possible to choose not to provide a blocking side wall along the length direction of the bottom shell 400, or to provide a connecting window on the side wall along the length direction of the bottom shell 400, so as to facilitate the transmission connection between the output end of the driving member and the top block 204.

[0051] Preferably, the bottom shell 400 is connected to the lower support 201, and the bottom shell 400 and the lower support 201 are fastened together by using screws 403.

[0052] According to one embodiment provided by the present invention, such as Figure 2 , Figure 7 and Figure 8 As shown, an upper cover 401 is provided above the bottom shell 400, and the upper cover 401 covers the outside of the upper swing arm 200.

[0053] A buffer spring 402 is fixedly provided on the inner wall surface of the upper cover 401 facing the upper swing arm 200, and the end of the buffer spring 402 away from the upper cover 401 abuts against the upper surface of the upper swing arm 200.

[0054] In this embodiment, in order to match the contour design of the top block 204 surface to limit the swing amplitude of the upper swing arm 200, an upper cover 401 is provided above the bottom shell 400. Preferably, the upper cover 401 can cover the outer wall of the upper swing arm 200, thereby facilitating the stability during use. At the same time, the upper cover plate and the bottom shell 400 are fastened together by screws 403.

[0055] Among them, the upper guard 401 is fixed with a buffer spring 402 on the inner wall surface facing the upper swing arm 200. The buffer spring 402 is used to buffer the impact when the upper swing arm 200 swings, so as to ensure the stability of the locking process of the wheel end nut 101.

[0056] According to one embodiment provided by the present invention, such as Figure 2 , Figure 7 and Figure 8 As shown, the upper cover 401 has a screw hole, the threaded end of the screw 403 passes through the screw hole and is located on the side of the upper cover 401 facing the upper swing arm 200, and the buffer spring 402 is sleeved on the threaded end of the screw 403.

[0057] In this embodiment, to facilitate the fixed installation of the buffer spring 402 and ensure that the end of the buffer spring 402 can abut against the top wall of the upper swing arm 200, a screw hole is provided at the center of the upper cover 401. The threaded end of the screw 403 passes through the screw hole, and the threaded end of the screw 403 is located inside the upper cover 401. The buffer spring 402 is sleeved on the threaded end of the screw 403. By designing the end of the buffer spring 402 installed on the threaded end of the screw 403 to be in the form of a contracted outer diameter, the relative fixation of the buffer spring 402 and the screw 403 can be ensured.

[0058] According to one embodiment provided by the present invention, such as Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, the upper swing arm 200 has a positioning groove 2002 at the end away from the rotating wheel 302. The opening of the positioning groove 2002 faces the sleeve 202, and the pressure head 203 is installed in the positioning groove 2002 by positioning bolts.

[0059] In this embodiment, the upper swing arm 200 is provided with a positioning groove 2002, which is located at the end of the upper swing arm 200 away from the rotating wheel 302. At the same time, the opening of the positioning groove 2002 faces the sleeve 202, so that the pressure head 203 can smoothly lock the edge when pressing down. In order to fix the pressure head 203 in the positioning groove 2002, a screw hole is provided in the positioning groove 2002. The pressure head 203 is fixedly installed in the positioning groove 2002 by the cooperation of the positioning bolt and the mounting hole to ensure stability during use.

[0060] Meanwhile, since the pressure head 203 and the positioning groove 2002 are installed using positioning bolts, the pressure head 203 can be easily disassembled and replaced, ensuring that pressure heads 203 suitable for various types of wheel end nuts 101 can be installed, thereby improving the overall applicability of the locking device provided in this embodiment.

[0061] According to one embodiment provided by the present invention, such as Figure 5 As shown, an adjusting shim 304 is provided between the upper top wall of the pressure head 203 and the inner bottom wall of the positioning groove 2002.

[0062] In this embodiment, since the pressure head 203 and the positioning groove 2002 are installed using positioning bolts, they will be in a relatively fixed position after installation. Therefore, an adjusting shim 304 is provided between the upper top wall of the pressure head 203 and the inner bottom wall of the positioning groove 2002 to achieve fine adjustment of the position of the pressure head 203, thereby facilitating adjustment during the production process and ensuring that production efficiency is not affected.

[0063] Of course, the specific number of adjusting shims 304 set between the upper top wall of the pressure head 203 and the inner bottom wall of the positioning groove 2002 is not limited here. It can be selected according to the actual use. Optionally, there can be one, two or more. The purpose of each is not to deviate from the design concept of the present invention and should fall within the protection scope of the present invention.

[0064] According to one embodiment provided by the present invention, such as Figure 1 , Figure 7 and Figure 8 As shown, the lower bracket 201 has an installation hole, and the sleeve 202 has a threaded hole at the corresponding position of the installation hole. The mounting bolt 305 passes through the installation hole and is threadedly connected to the threaded hole.

[0065] In this embodiment, the lower bracket 201 is provided with a mounting hole at the end opposite to the roller 300. Threaded holes are provided at the corresponding positions of the sleeve 202 and the mounting hole. The mounting bolt 305 is threaded through the mounting hole and connected to the threaded hole, thereby fixing the sleeve 202 in the mounting hole. This facilitates the limiting of the wheel end nut 101 during the edge locking process.

[0066] According to one embodiment provided by the present invention, such as Figure 1 and Figure 2 As shown, the inner bottom wall of the sleeve 202 is provided with a positioning block 2021, which can engage with the anti-loosening groove 102 at the end of the drive shaft 100 to limit the drive shaft 100.

[0067] In this embodiment, a positioning block 2021 is provided on the inner bottom wall of the sleeve 202. Preferably, the positioning block 2021 is located directly below the inner bottom wall to facilitate engagement with the anti-loosening groove 102 at the end of the drive shaft 100, thereby limiting the movement of the drive shaft 100. Of course, the positioning block 2021 is wedge-shaped to facilitate engagement with the anti-loosening groove 102 and to make disengagement from the anti-loosening groove 102 relatively convenient, effectively preventing the positioning block 2021 from getting stuck in the anti-loosening groove 102.

[0068] like Figure 2 As shown, the rod portion of the outer ball cage housing of the drive shaft 100 is designed with a symmetrical double-sided anti-loosening groove 102 structure to work with the positioning block 2021. The width and symmetry tolerance of the anti-loosening grooves 102 on both sides need to meet high requirements. One side anti-loosening groove 102 is used to position the positioning block 2021 during the locking process, and the other side anti-loosening groove 102 is used to accommodate the flange deformation of the wheel end nut 101 to ensure the stability of the centering locking.

[0069] According to one embodiment provided by the present invention, such as Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the upper swing arm 200 is provided with a first connecting ear 2003, and the first connecting ear 2003 has a first rotating hole. The lower bracket 201 is provided with a second connecting ear 2012, and the second connecting ear 2012 has a second rotating hole. The first connecting ear 2003 and the second connecting ear 2012 are arranged alternately to form a hinge area. The third rotating shaft 306 passes through the first rotating hole and the second rotating hole in sequence.

[0070] In this embodiment, in order to facilitate relative rotation between the upper swing arm 200 and the lower support 201, the upper swing arm 200 is provided with a first connecting ear 2003 and the lower support 201 is provided with a second connecting ear 2012. The first connecting ear 2003 and the second connecting ear 2012 are alternately arranged to form a hinge area. By using a third rotating shaft 306 passing through the first rotating hole and the second rotating hole, the upper swing arm 200 and the lower support 201 are rotated. This allows the driving member to smoothly lift the upper swing arm 200 when it drives the top block 204 to move forward toward the upper swing arm 200, causing the upper swing arm 200 to rotate relative to the top block 204 and drive the pressure head 203 to press down to complete the edge locking.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A locking device for locking the wheel end nut (101) of a drive shaft (100) in an automotive transmission system, characterized in that, It includes an upper swing arm (200), a lower bracket (201), a sleeve (202), a pressure head, a top block (204), and a drive component; The upper swing arm (200) and the lower bracket (201) are hinged to form a hinge area. The sleeve (202) is located between the upper swing arm (200) and the lower bracket (201). The rod end of the drive shaft (100) is provided with the wheel end nut (101) and placed inside the sleeve (202). The sleeve (202) can limit the rod end of the drive shaft (100) to lock the edge of the wheel end nut (101). The pressure head is located at one end of the upper swing arm (200) facing the sleeve (202), and the top block (204) is located on the other side of the hinge area opposite to the sleeve (202). The top block (204) is connected to the output end of the drive member. The drive member can drive the top block (204) to move along the length direction of the lower bracket (201) so as to drive the upper swing arm (200) to rotate relative to the lower bracket (201) along the hinge area.

2. The locking device according to claim 1, characterized in that, The lower support (201) is provided with a groove (2011), and a roller (300) is provided in the groove (2011). The roller (300) is connected to the side wall of the groove (2011) through a first rotating shaft (301). The bottom surface of the top block (204) is in contact with the outer wall surface of the roller (300). The top block (204) has a slope (2041) and a plane (2042) connected in sequence on the side facing the upper swing arm (200). The upper swing arm (200) is provided with a mounting groove (2001) at the end opposite to the pressure head. A rotating wheel (302) is provided in the mounting groove (2001). The rotating wheel (302) is connected to the side wall of the mounting groove (2001) through a second rotating shaft (303). The rotating wheel (302) can move along the slope (2041) and the plane (2042).

3. The locking device according to claim 2, characterized in that, The lower support (201) has a bottom shell (400) on its outer side, and the top block (204) is located inside the bottom shell (400).

4. The locking device according to claim 3, characterized in that, An upper cover (401) is provided above the bottom shell (400), and the upper cover (401) covers the outside of the upper swing arm (200); A buffer spring (402) is fixedly provided on the inner wall surface of the upper cover (401) facing the upper swing arm (200), and the end of the buffer spring (402) away from the upper cover (401) abuts against the upper surface of the upper swing arm (200).

5. The locking device according to claim 4, characterized in that, The upper cover (401) has a screw hole, the threaded end of the screw (403) passes through the screw hole and is located on the side of the upper cover (401) facing the upper swing arm (200), and the buffer spring (402) is sleeved on the threaded end of the screw (403).

6. The locking device according to claim 2, characterized in that, The upper swing arm (200) has a positioning groove (2002) at the end opposite to the rotating wheel (302), the opening of the positioning groove (2002) faces the sleeve (202), and the pressure head is installed in the positioning groove (2002) by positioning bolts.

7. The locking device according to claim 6, characterized in that, An adjusting shim (304) is provided between the upper top wall of the pressure head and the inner bottom wall of the positioning groove (2002).

8. The locking device according to claim 1, characterized in that, The lower bracket (201) has an installation hole, and the sleeve (202) has a threaded hole at the position corresponding to the installation hole. The mounting bolt (305) passes through the installation hole and is threadedly connected to the threaded hole.

9. The locking device according to claim 1, characterized in that, The inner bottom wall of the sleeve (202) is provided with a positioning block (2021), which can engage with the anti-loosening groove (102) at the end of the drive shaft (100) to limit the drive shaft (100).

10. The locking device according to any one of claims 2-9, characterized in that, The upper swing arm (200) is provided with a first connecting ear (2003), and the first connecting ear (2003) has a first rotating hole. The lower bracket (201) is provided with a second connecting ear (2012), and the second connecting ear (2012) has a second rotating hole. The first connecting ear (2003) and the second connecting ear (2012) are alternately arranged to form the hinge area. The third rotating shaft (306) passes through the first rotating hole and the second rotating hole in sequence.

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