Hub out-of-round detection device
By designing a wheel hub out-of-roundness detection device, the problem of time-consuming and labor-intensive wheel hub inspection in the existing technology is solved. It provides a simple and low-cost inspection method that does not require disassembly and is applicable to both disassembled and undisassembled wheel hubs.
Patent Information
- Application Number
- CN202520200836.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2035-02-08
AI Technical Summary
Existing wheel hub out-of-roundness detection methods require disassembly and fixing to the testing equipment, which is complex, costly, and requires a large space.
A wheel hub out-of-roundness detection device was designed. It is fixed to the wheel hub by a fastener and its central axis is collinear with the wheel hub rotation axis. The locking part of the frame is slidably locked to the edge of the wheel hub. The detection pen is installed on the fixed bracket and contacts the edge of the wheel hub. The frame is rotated to perform the detection.
It enables testing without disassembling the wheel hub. The device is compact, low-cost, and easy to operate. It is suitable for both disassembled and undisturbed wheel hubs and is convenient to carry and use.
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Figure CN223815063U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of hub detection jigs, and particularly relates to a hub out-of-round detection device. BACKGROUND
[0002] Before a vehicle is shipped, a used car is traded or a vehicle is maintained, hub out-of-round detection is involved. Specifically, hub out-of-round refers to the phenomenon that the shape of a hub is not round, which leads to a safety hazard. In the prior art, when hub out-of-round detection is performed, the hub is usually disassembled and then fixed to a detection device, and then the hub is rotated for detection by the detection device. This detection method is also referred to as a dynamic detection method in the prior art.
[0003] However, the above dynamic detection method has the problems of time-consuming and laborious disassembly and fixing of the hub to the detection device, and the operation process is relatively complex, which requires professional operators. Moreover, the existing detection device has a high cost and occupies a large area.
[0004] Therefore, there is an urgent need for a hub out-of-round detection tool that does not require disassembly of the hub and can reduce detection cost and operation difficulty. CONTENT OF THE INVENTION
[0005] To solve the above technical problems, the present application provides a hub out-of-round detection device, which can detect the out-of-round of the hub without disassembling the hub, has simple operation, small structure and low cost.
[0006] The present application provides a hub out-of-round detection device, which comprises:
[0007] A frame body, one end of the frame body is provided with a clamping portion, and the clamping portion is configured to be clamped to the edge of the hub in a circumferential sliding manner;
[0008] A fixing member is rotatably installed at the other end of the frame body, and the center axis of the fixing member is collinear with the rotation axis of the hub, so that the frame body rotates around the center axis of the fixing member;
[0009] A fixing bracket is arranged at one end of the frame body provided with the clamping portion, and the fixing bracket is configured to install a detection pen, so that the detection end of the detection pen contacts the edge of the hub.
[0010] Optionally, the clamping portion is in the form of a hook structure, and the hook structure is configured to be hooked to the edge of the hub.
[0011] Optionally, one end of the frame body is further provided with a positioning portion, the positioning portion is provided with a positioning hole, and the detection end of the detection pen is arranged through the positioning hole.
[0012] Optionally, one end of the fixing support is provided with a clamping portion, and the other end is rotatably installed on the frame body.
[0013] Optionally, the fixing support and the positioning portion are respectively located on two sides of the frame body, one end of the frame body provided with the clamping portion is provided with an avoiding hole, and one end of the detection pen provided with the detection end is configured to pass through the avoiding hole and is adjustable relative to the position of the avoiding hole.
[0014] Optionally, the other end of the frame body is provided with a sliding hole and a locking assembly, the fixing member is provided with a bearing, the bearing is arranged in the sliding hole and is configured to slide along the sliding hole, and the locking assembly is configured to lock the position of the bearing in the sliding hole and limit the rotation of the outer ring of the bearing.
[0015] Optionally, the locking assembly comprises an adjusting rod, an elastic member and a locking member, the adjusting rod is installed on the other end of the frame body and is movable relative to the sliding hole, one end of the adjusting rod abuts against the outer ring of the bearing, the elastic member is arranged between the outer ring of the bearing and the inner wall of one end of the sliding hole, and the locking member is configured to lock the position of the adjusting rod relative to the sliding hole.
[0016] Optionally, the other end of the frame body is provided with a mounting hole, a fixing block is fixedly arranged in the mounting hole, a first threaded hole in communication with the sliding hole is formed in the fixing block, the adjusting rod passes through the first threaded hole and is threadedly connected with the first threaded hole.
[0017] Optionally, the side walls on both sides of the sliding hole are provided with sliding grooves, and the locking assembly further comprises a limiting block, the limiting block is slidably connected to the sliding grooves on both sides, and the limiting block is located between the elastic member and the outer ring of the bearing.
[0018] Optionally, one end of the fixing member is provided with a magnetic fixing disc, and the magnetic fixing disc is configured to be adsorbed to the center of the hub.
[0019] Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: when the hub is detected for out-of-roundness, the fixing member is only needed to be fixed on the hub, the center axis of the fixing member is made to be collinear with the rotation axis of the hub, the clamping portion of the frame body is slidably clamped on the edge of the hub, the detection pen is installed on the fixing support and the pen tip contacts the edge of the hub, then the frame body is rotated, so that the detection pen can detect the out-of-roundness of the hub, which can be applied to the detection of the disassembled hub and can directly detect the hub on the vehicle without disassembling the hub, and the hub out-of-roundness detection device of the application has the advantages of small structure, low cost, no need to occupy the site, hand-held operation, convenient carrying and simple operation compared with the detection equipment in the prior art. BRIEF DESCRIPTION OF DRAWINGS
[0020] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings required by the embodiments or the prior art description will be briefly introduced as follows. Obviously, for those skilled in the field, under the premise of no creative labor, other drawings can also be obtained according to these drawings.
[0022] Figure 1 A perspective structural schematic diagram of the hub out-of-round detection device provided by the embodiments of the present application is shown in the figure.
[0023] Figure 2 A sectional view of the hub out-of-round detection device provided by the embodiments of the present application is shown in the figure.
[0024] Figure 3 A state schematic diagram of the hub out-of-round detection device provided by the embodiments of the present application when acting on the hub is shown in the figure.
[0025] Figure 4 A front view of the hub out-of-round detection device provided by the embodiments of the present application when acting on the hub (part of the hub is shown) is shown in the figure.
[0026] Figure 5 A structural schematic diagram of the frame of the hub out-of-round detection device provided by the embodiments of the present application is shown in the figure.
[0027] Figure 6 An enlarged schematic diagram of A of the embodiments of the present application is shown in the figure. Figure 1
[0028] Figure 7 A structural schematic diagram of the fixing support of the hub out-of-round detection device provided by the embodiments of the present application is shown in the figure.
[0029] Figure 8 An enlarged schematic diagram of B of the embodiments of the present application is shown in the figure. Figure 1
[0030] A structural schematic diagram of the fixing member of the hub out-of-round detection device provided by the embodiments of the present application is shown in the figure. Figure 9 Among them:
[0031]
[0032] 1, frame body; 11, clamping part; 12, positioning part; 121, positioning hole; 13, avoiding hole; 14, sliding hole; 15, fixed block; 16, through hole; 17, second hinge hole; 2, fixing piece; 21, bearing; 22, magnetic attraction fixing disc; 23, fixed rod; 24, handle; 3, fixed support; 31, clamping part; 311, clamping hole; 312, jack screw; 313, opening structure; 314, opening gap; 32, support arm; 321, first hinge hole; 4, locking assembly; 41, adjusting rod; 42, elastic piece; 43, locking piece; 44, limiting block; 45, knob; 10, hub; 20, detection pen. DETAILED DESCRIPTION
[0033] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0034] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some of the embodiments of the present application, not all the embodiments.
[0035] The existing technology for detecting the out-of-roundness of the hub is usually a dynamic detection method, specifically, the hub is disassembled and fixed to a detection device, and then the hub is rotated for detection by the detection device, which is also called a dynamic detection method in the existing technology. However, the dynamic detection method has the problems of time-consuming and laborious disassembly and fixing of the hub to the detection device, and the operation process of dynamic detection of the hub by the detection device is relatively complex, which requires professional operators, and the existing detection device has a high cost and occupies a large area.
[0036] In view of the above technical problems, the embodiments of the present application provide a hub out-of-roundness detection device, which comprises a frame body, a detection pen and a handle. Figures 1-4As shown, the wheel hub out-of-round detection device comprises a frame body 1, a fixing member 2 and a fixing support 3, wherein the fixing member 2 and the fixing support 3 are respectively arranged at two ends of the frame body 1, the fixing member 2 is used for being fixed at a center position of the wheel hub 10, and specifically, a central axis of the fixing member 2 is collinear with a rotation axis of the wheel hub 10, so that the frame body 1 can rotate around the central axis of the fixing member 2. The fixing support 3 is used for mounting the detection pen 20, and the detection end (i.e. the pen tip) of the detection pen 20 is arranged to contact the edge of the wheel hub 10, so as to detect the out-of-round of the wheel hub 10. Specifically, the frame body 1 rotates around the central axis of the fixing member 2, so that the detection end of the detection pen 20 moves along the edge of the wheel hub 10 in a circumferential direction. During the movement, the detection pen 20 generates a reading. When the reading of the detection pen 20 changes obviously during the movement, it indicates that the wheel hub 10 has an out-of-round at the position where the detection end of the detection pen 20 is located. If the reading of the detection pen 20 does not change obviously after the detection end moves along the edge in a circumferential direction for one round, it indicates that the wheel hub 10 does not have an out-of-round. Optionally, the detection pen 20 can be a traditional mechanical detection pen (such as a pressure gauge), or an electronic detection pen, which can realize digitalization of the wheel hub out-of-round, and facilitate generation of a wheel hub data waveform diagram, so as to better determine whether the wheel hub 10 has an out-of-round problem.
[0037] In the embodiment, as shown in the drawings, Figures 4-6 a clamping portion 11 is arranged at one end of the frame body 1, the clamping portion 11 can be clamped to the edge of the wheel hub 10, and when the frame body 1 rotates relative to the fixing member 2, the clamping portion 11 can slide in a circumferential direction relative to the edge of the wheel hub 10. That is to say, by arranging the clamping portion 11 and cooperating with the fixing of the fixing member 2 at the center position of the wheel hub 10, the frame body 1 can rotate in a circumferential direction, and further drive the detection pen 20 to detect the out-of-round of the wheel hub 10 in a circumferential direction.
[0038] Preferably, the clamping portion 11 of the embodiment has a hook structure, which can be hooked to the edge of the wheel hub 10. It should be noted that in a direction away from one end of the frame body 1, the thickness of the hook structure gradually decreases, that is to say, the end of the clamping portion 11 has a sharp hook structure. When the wheel hub 10 is not disassembled from the vehicle, the clamping portion 11 with the structure can be inserted into the gap between the edge of the wheel hub 10 and the tire, and can slide in a circumferential direction along the gap. That is to say, by the structure, the wheel hub out-of-round detection device of the present application can be applied to the out-of-round detection of the wheel hub 10 which is not disassembled.
[0039] Optionally, as shown in the drawings, Figure 5 and Figure 6 one end of the frame body 1 extends downwardly to have a connecting portion, and the clamping portion 11 is connected to the connecting portion. A positioning portion 12 is further arranged at one end of the frame body 1, and the fixing support 3 and the positioning portion 12 are respectively located at two sides of the frame body 1 (i.e. Figure 6The positioning part 12 can be arranged on the inner side of the connecting part and parallel to the main body structure of the frame body 1. The positioning part 12 is provided with a positioning hole 121. After the detection pen 20 is installed on the fixed support 3, the detection end of the detection pen 20, i.e., the tip end, can pass through the positioning hole 121. Through the positioning hole 121, the detection end of the detection pen 20 can be ensured to contact the edge of the hub 10, so as to improve the detection accuracy of the detection pen 20.
[0040] As shown in Figure 5 and Figure 6 , the frame body 1 provided with the clamping part 11 is further provided with an avoiding hole 13 arranged through the length direction of the frame body 1. For example, the avoiding hole 13 can be an elongated hole. The detection end of the detection pen 20 can pass through the avoiding hole 13, and the position of the detection pen 20 relative to the avoiding hole 13 is adjustable, so that the detection end of the detection pen 20 is in the position of contacting the edge of the hub 10.
[0041] It should be noted that considering the different models and sizes of the detection pen 20, the size of the above-mentioned positioning hole 121 is greater than the diameter of the detection end of the detection pen 20, so as to be able to position the detection pen 20 of different models and sizes. In addition, in cooperation with the avoiding hole 13 on the frame body 1, the position of the detection pen 20 can be finely adjusted to be in the best detection position, so as to improve the detection effect.
[0042] Referring to Figure 1 , Figure 6 and Figure 7 , one end of the fixed support 3 of the embodiment is provided with a clamping part 31, and the other end is rotatably installed on the frame body 1. Exemplarily, the clamping part 31 can include a clamping hole 311 opened at one end of the fixed support 3 and a top screw 312 threadedly connected to both sides of the fixed support 3. The non-detection end of the detection pen 20 passes through the clamping hole 311 and is fixed in the clamping hole 311 through the top screws 312 on both sides.
[0043] Preferably, the clamping hole 311 is arranged as an opening structure 313 near the position of one end of the length direction of the fixed support 3, and an opening gap 314 is arranged at the position opposite to the opening structure 313. Through the opening structure 313 and the opening gap 314, the clamping part 31 has a certain deformation ability, thereby meeting the installation of detection pens 20 of different models and sizes.
[0044] The one end of the fixing support 3 without the clamping hole 311 is formed as a reverse U-shaped structure, the fixing support 3 includes support arms 32 on both sides, and the first hinge holes 321 are formed on the support arms 32, and the second hinge holes 17 are correspondingly arranged on the frame body 1, the rotating shaft sequentially passes through the first hinge hole 321 of one of the support arms 32, the second hinge hole 17, and the first hinge hole 321 of the other support arm 32, and the fixing support 3 is rotatably installed on the frame body 1. When the detection pen 20 of different models and sizes is installed, the position of the detection pen 20 can be adjusted by rotating the fixing support 3 relative to the frame body 1, so as to ensure that the detection end (i.e. the pen tip) of the detection pen 20 contacts the edge position of the hub 10.
[0045] In the embodiment, as shown in Figure 1 、 Figure 2 、 Figure 5 and Figure 8 , a sliding hole 14 is formed at the other end of the frame body 1, and the sliding hole 14 extends along the length direction of the frame body 1. A bearing 21 is arranged outside the fixing member 2, the bearing 21 can be arranged in the sliding hole 14 and can slide along the sliding hole 14. By sliding the bearing 21 in the sliding hole 14, the position of the fixing member 2 can be adjusted, so that when the out-of-roundness of the hub 10 of different models is detected, the clamping part 11 at one end of the frame body 1 is clamped to the edge of the hub 10, and at this time, the position of the fixing member 2 is adjusted so that the fixing member 2 is fixed at the center position of the hub 10.
[0046] It should be noted that the sliding hole 14 is arranged through from the upper surface of the frame body 1 downward, and a sliding groove can be arranged at the hole walls on both sides of the sliding hole 14, so that the bearing 21 is arranged in the sliding groove on both sides and can slide along the sliding groove. Of course, it can be understood that in the embodiment, a non-circular through hole 16 can be arranged at the end face of the other end of the frame body 1 along the length direction of the frame body 1, the through hole 16 is communicated with the sliding hole 14, and the width of the through hole 16 is greater than the width of the sliding hole 14, so that the part of the through hole 16 located on both sides of the sliding hole 14 forms the sliding groove.
[0047] In the embodiment, as shown in Figure 8 , the embodiment further includes a locking assembly 4 arranged at the other end of the frame body 1, the locking assembly 4 can lock the position of the bearing 21 relative to the sliding hole 14, and the locking assembly 4 can limit the rotation of the outer ring of the bearing 21, so that after the fixing member 2 is fixed at the center of the hub 10, displacement does not occur, which affects the detection effect.
[0048] In the embodiment, the locking assembly 4 includes an adjusting rod 41, an elastic member 42, and a locking member 43, the adjusting rod 41 is installed at the other end of the frame body 1, and the end of the adjusting rod 41 abuts against the outer ring of the bearing 21, and the locking member 43 can lock the position of the adjusting rod 41 relative to the sliding hole 14. As shown inFigure 8 As shown, the fixing block 15 can be arranged in the through hole 16 formed in the frame 1, and the fixing block 15 is fixed in the through hole 16 by a locking member 43 arranged in the frame 1, which can be a top screw. A first threaded hole is formed in the fixing block 15, and the adjusting rod 41, which is preferably a lead screw, is threadedly connected with the first threaded hole. When the adjusting rod 41 is rotated, the adjusting rod 41 moves along the sliding hole 14 relative to the fixing block 15, and in turn drives the bearing 21 to move along the sliding hole 14, so as to adjust the position of the fixing member 2. In addition, it should be noted that the threaded connection between the adjusting rod 41 and the fixing block 15 can lock the position of the adjusting rod 41 relative to the sliding hole 14.
[0049] It should be noted that the adjusting rod 41 and the elastic member 42 of the present embodiment jointly act to fix the position of the bearing 21. For example, the elastic member 42 and the adjusting rod 41 of the present embodiment are arranged on both sides of the bearing 21, and the elastic member 42 is arranged between the outer ring of the bearing 21 and the inner wall of one end of the sliding hole 14, that is, one end of the elastic member 42 is connected to the inner wall of the sliding hole 14, and the other end abuts against or is connected to the outer ring of the bearing 21. When the adjusting rod 41 moves towards the elastic member 42 to adjust the position of the fixing member 2, the elastic member 42 is compressed. When the adjusting rod 41 moves away from the elastic member 42, the elastic force of the elastic member 42 drives the fixing member 2 to move, so as to adjust the position of the fixing member 2. The elastic member 42 of the present embodiment is preferably a spring.
[0050] Preferably, in the present embodiment, the locking assembly 4 further comprises a limiting block 44 arranged in the sliding hole 14 and located on both sides of the sliding groove. One end of the above-mentioned elastic member 42 is fixedly connected to the limiting block 44 and abuts against or is connected to the outer ring of the bearing 21 through the limiting block 44. It should be noted that, in the present embodiment, the adjusting rod 41 abuts against one side of the outer ring of the bearing 21, and the limiting block 44 abuts against or is connected to the other side of the outer ring of the bearing 21, which can limit the rotation of the outer ring of the bearing 21, and in turn, through the relative rotation between the inner and outer rings of the bearing 21, the rotation of the frame 1 relative to the fixing member 2 is realized.
[0051] Preferably, in the present embodiment, a knob 45 is arranged at the end of the adjusting rod 41, so as to rotate the adjusting rod 41 by an operator.
[0052] In the present embodiment, as shown in the drawings, Figure 9 The fixing member 2 comprises a magnetic fixing disc 22, a fixing rod 23 and a handle 24. The bearing 21 is sleeved on the fixing rod 23, and the inner ring of the bearing 21 is fixedly connected with the fixing rod 23, so that the fixing rod 23 rotates with the inner ring of the bearing 21 relative to the outer ring of the bearing 21. The magnetic fixing disc 22 is arranged at one end of the fixing rod 23 and can be attracted to the center of the hub 10. The handle 24 is arranged at the other end of the fixing rod 23, so as to be held and operated by an operator.
[0053] In the out-of-round detection of the wheel hub 10, only the clamping part 11 of the frame body 1 is slidably clamped on the edge of the wheel hub 10, then the fixing part 2 is fixed at the center position of the wheel hub 10, so that the center axis of the fixing part 2 is collinear with the rotation axis of the wheel hub 10, and the detection pen 20 is installed on the fixing support 3 and the detection end contacts the edge of the wheel hub 10, then the frame body 1 is rotated, so that the detection pen 20 can detect the out-of-round of the wheel hub 10. The wheel hub out-of-round detection device of the embodiment can be applied to the detection of the disassembled wheel hub 10, and can also directly check the wheel hub 10 on the vehicle without disassembling the wheel hub 10. Moreover, compared with the detection equipment in the prior art, the wheel hub out-of-round detection device has a small structure, a low cost, does not need to occupy a site, can be operated by hand, is convenient to carry and easy to operate.
[0054] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Additionally, terms such as“include”,“comprise”, or“have” are intended to be inclusive and allow for any other item, whether a component, an interconnection, a process step, or otherwise, to be present, associated with, or a part of, the subject at issue.
[0055] The foregoing is merely illustrative of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the application is not to be limited to the embodiments described herein but is to give the full scope of the application as defined in the following claims.
Claims
1. A wheel out-of-roundness detection device, characterized by, The application relates to a wheel hub detection device. The device comprises a frame body, a fixing member and a fixing support. The frame body is provided with a clamping part at one end, which is configured to be clamped on the edge of the wheel hub in a circumferential sliding mode. The fixing member is rotatably installed at the other end of the frame body, and the central axis of the fixing member is collinear with the rotation axis of the wheel hub, so that the frame body rotates around the central axis of the fixing member.
2. The out-of-round detection apparatus of claim 1, wherein The fixing support is installed at the end of the frame body provided with the clamping part, and is configured to install a detection pen, so that the detection end of the detection pen contacts the edge of the wheel hub.
3. The out-of-round detection apparatus of claim 1, wherein The clamping part is in the form of a hook structure, which is configured to be hooked on the edge of the wheel hub.
4. The out-of-roundness detection apparatus of any one of claims 1-3, wherein, The end of the frame body is further provided with a positioning part, which is provided with a positioning hole, and the detection end of the detection pen is arranged through the positioning hole.
5. The out-of-round detection apparatus of claim 3, wherein One end of the fixing support is provided with a clamping part, and the other end is rotatably installed on the frame body.
6. The out-of-roundness detection apparatus of any one of claims 1-3, wherein, The fixing support and the positioning part are respectively located on the two sides of the frame body, the end of the frame body provided with the clamping part is provided with an avoiding hole, and the end of the detection pen provided with the detection end is configured to pass through the avoiding hole and is adjustable relative to the position of the avoiding hole.
7. The out-of-round detection apparatus of claim 6, wherein The other end of the frame body is provided with a sliding hole and a locking assembly, the fixing member is provided with a bearing, the bearing is arranged in the sliding hole and is configured to slide along the sliding hole, and the locking assembly is configured to lock the position of the bearing in the sliding hole and limit the rotation of the outer ring of the bearing.
8. The out-of-round detection apparatus of claim 7, wherein The locking assembly comprises an adjusting rod, an elastic member and a locking member, the adjusting rod is installed at the other end of the frame body and is movable relative to the sliding hole, one end of the adjusting rod abuts against the outer ring of the bearing, the elastic member is arranged between the outer ring of the bearing and the inner wall of one end of the sliding hole, and the locking member is configured to lock the position of the adjusting rod relative to the sliding hole.
9. The out-of-round detection apparatus of claim 7 or 8, wherein The other end of the frame body is provided with a mounting hole, a fixing block is fixedly arranged in the mounting hole, a first threaded hole is formed in the fixing block and is in communication with the sliding hole, the adjusting rod passes through the first threaded hole and is in threaded connection with the first threaded hole.
10. The out-of-roundness detection apparatus of any one of claims 1-3, wherein, The side walls on the two sides of the sliding hole are provided with sliding grooves, and the locking assembly further comprises a limiting block, the limiting block is slidably connected to the sliding grooves on the two sides, and the limiting block is located between the elastic member and the outer ring of the bearing. One end of the fixing member is provided with a magnetic fixing disc, which is configured to be adsorbed to the center of the wheel hub.