Fastening tool and method of assembly

Abstract

The application provides a fastening tool and an assembling method. The fastening tool comprises a tool body, a fastening assembly and a driving shaft bolt. The tool body is used for being fixedly connected with the driving shaft bolt. The fastening assembly comprises an elastic member and a mounting member. The mounting member is rotatably sleeved on the outer periphery of the tool body. One end of the elastic member is fixedly connected with the mounting member, and the other end of the elastic member is used for abutting against a hub bearing or a brake disc. The fastening tool has a fastening state. In the fastening state, the tool body is connected with the driving shaft bolt, the driving shaft bolt is connected with a driving shaft, the elastic member abuts against the hub bearing or the brake disc, and the elastic member is in a compressed state. The scheme can improve the assembling reliability of the end face spline type driving shaft and the hub bearing.

Description

Technical Field

[0001] This application relates to the field of assembly drive shafts and hub bearings, and more specifically, to a fastening fixture and assembly method. Background Technology

[0002] The spline fit between the outer end of the drive shaft and the end face of the wheel hub bearing is a new type of spline fit structure that solves the problem of abnormal contact noise when the drive shaft and the wheel hub bearing are subjected to torsional loads, and it is being used more and more in the automotive industry.

[0003] During drive shaft assembly, the end splines of the drive shaft are first aligned with the end splines of the wheel hub bearing, and then the drive shaft is secured with drive shaft bolts. However, during the tightening process, under the weight of the drive shaft itself, the end splines of the drive shaft and the wheel hub bearing are prone to misalignment, resulting in a false tightness between the drive shaft and the wheel hub bearing. When the vehicle is driven under these conditions, the fit between the drive shaft and the wheel hub bearing becomes loose, easily causing abnormal noise. Summary of the Invention

[0004] This application provides a fastening fixture and assembly method that can improve the assembly reliability of end-face spline type drive shaft and hub bearing.

[0005] In a first aspect, this application provides a fastening fixture for assembling a splined drive shaft and a hub bearing, comprising: a fixture body for fixedly connecting to a drive shaft bolt via connecting bolts; and a fastening assembly including an elastic element and a mounting element, wherein the mounting element is rotatably sleeved on the outer periphery of the fixture body, one end of the elastic element is fixedly connected to the mounting element, and the other end is used to abut against the hub bearing or brake disc. The fastening fixture has a fastened state, wherein in the fastened state, the fixture body is bolted to the drive shaft, the drive shaft bolt is connected to the drive shaft, the elastic element abuts against the hub bearing or the brake disc, and the elastic element is in a compressed state.

[0006] Optionally, the tooling body includes a sleeve, one end of which is used to fit over the head of the drive shaft bolt. The sleeve has a connecting cavity extending along the length of the sleeve, and the connecting bolt is disposed in the connecting cavity for screwing into the head of the drive shaft bolt.

[0007] Optionally, the connecting cavity includes a first connecting cavity and a second connecting cavity, and the connecting bolt includes a connected head and a screw, wherein the radial dimension of the head is greater than the radial dimension of the screw; wherein the head is located in the second connecting cavity, the screw is located in the first connecting cavity, and the radial dimensions of both the second connecting cavity and the head are greater than the radial dimension of the first connecting cavity.

[0008] Optionally, the fastening fixture further includes an anti-detachment component, the outer periphery of which abuts against the inner wall of the sleeve. The anti-detachment component is located in the second connecting cavity and on the side of the head opposite to the screw. The anti-detachment component has a through hole, the radial dimension of which is smaller than the radial dimension of the head.

[0009] Optionally, the head of the drive shaft bolt has a threaded hole, and the connecting bolt passes through the threaded hole.

[0010] Optionally, the fastening fixture further includes a rotating bearing, the mounting component is fixedly connected to the outer ring of the rotating bearing, and the fixture body is fixedly connected to the inner ring of the rotating bearing, so that the mounting component is rotatably fitted onto the outer periphery of the fixture body.

[0011] Optionally, the elastic element is a compression spring, and the tooling body further includes a hook bolt, which includes a hook portion and a fixing portion. The hook portion hooks onto one end of the compression spring, and the fixing portion is bolted to the mounting component.

[0012] Optionally, the mating length between the connecting bolt and the drive shaft bolt is greater than or equal to the maximum compression of the elastic element in the tightened state.

[0013] Optionally, the elastic element is a compression spring. In the tightened state, the compression spring has a first compression period and a second compression period following the first compression period. During the first compression period, the compression spring changes from the natural state to the compressed state, and the compression spring has a first stiffness coefficient. During the second compression period, the compression spring has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient.

[0014] Optionally, the fastening fixture also has an initial state in which the fixture body is bolted to the drive shaft, a portion of the screw of the drive shaft bolt is partially connected to the drive shaft, and the elastic element has a gap with the wheel hub bearing or the brake disc.

[0015] Secondly, this application also provides an assembly method, employing the fastening fixture described in any of the above claims, comprising: The tooling body is fixedly connected to the drive shaft bolt using the connecting bolt; The drive shaft bolt is fastened by the tooling body, so that the drive shaft bolt is fixedly connected to the drive shaft; Loosen the connecting bolts to separate the tooling body from the drive shaft bolts.

[0016] Optionally, the method further includes: rotating the hub bearing circumferentially during the process of tightening the drive shaft bolts through the tooling body.

[0017] This solution has at least the following advantages: When assembling the drive shaft and wheel hub bearing, the operator can first use connecting bolts to connect the fixture body and the drive shaft bolts to form a whole. Then, by twisting the fixture body, the drive shaft bolts are tightened into the drive shaft. At this time, driven by the drive shaft bolts, the entire fastening fixture moves towards the side closer to the drive shaft and wheel hub bearing. The elastic element is sandwiched between the wheel hub bearing (or brake disc) and the mounting part, and is compressed by the wheel hub bearing (or brake disc) and the mounting part, generating an elastic fastening force. The elastic fastening force has a tendency to push the wheel hub bearing towards the end closer to the drive shaft. Under the action of the elastic fastening force, the drive shaft spline and the bearing spline can mesh more easily, improving the reliability of the drive shaft and wheel hub bearing assembly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the connection structure between the drive shaft and the wheel hub bearing; Figure 2 This is a schematic diagram of the fastening fixture provided in one embodiment of this application; Figure 3 This is a schematic diagram of the fastening fixture provided in one embodiment of this application during operation; Figure 4 This is a schematic diagram of the assembly method provided in an embodiment of this application.

[0019] Explanation of reference numerals in the attached drawings: 10, drive shaft; 11, drive shaft end face spline; 20, hub bearing; 21, bearing end face spline; 30, drive shaft bolt; 41, tooling body; 411, first connecting cavity; 412, second connecting cavity; 42, mounting part; 43, elastic element; 44, connecting bolt; 441, head; 442, screw; 45, hook bolt; 451, hook part; 452, fixing part; 46, anti-detachment part; 461, through hole; 47, rotating bearing; 50, brake disc; 60, fastening tool. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application.

[0021] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, the terms "a" or "one" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one, which will be separately stated if only "a" is referred to. "A plurality" or "several" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper," "top," "bottom," and similar terms are for ease of description only and are not limited to a location or spatial orientation. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The word “connection” or “link” is not limited to physical or mechanical connections, but can also include electrical connections, whether direct or indirect.

[0022] refer to Figure 1 , Figure 1 This is the connection structure between the drive shaft 10 and the hub bearing 20. The drive shaft 10 includes a drive shaft end face spline 11 located on its end face, and the hub bearing 20 includes a bearing end face spline 21 adapted to the drive shaft 10. Currently, when assembling the drive shaft 10 and the hub bearing 20, the drive shaft end face spline 11 and the bearing end face spline 21 are generally first fitted together, and then the drive shaft bolts 30 are tightened using a fastening tool 60 (such as a wrench, screwdriver, etc.) to complete the assembly of the drive shaft 10 and the hub bearing 20. However, under the action of the drive shaft 10's own weight, the drive shaft end face spline 11 and the bearing end face spline 21 are easily misaligned, resulting in poor fit between the two. For example, if the tips of the teeth on the drive shaft end face spline 11 mate with the tips of the teeth on the bearing end face spline 21, this can cause a false tightness between the drive shaft 10 and the wheel hub bearing 20, which is difficult to detect during inspection. When the vehicle is in this condition, the fit between the drive shaft 10 and the wheel hub bearing 20 will become loose, easily causing abnormal noise. To avoid this situation, some assemblers choose to manually keep the drive shaft end face spline 11 and the bearing end face spline 21 in contact when assembling the drive shaft 10 and the wheel hub bearing 20. However, this method requires considerable effort from the assemblers and has a low success rate and efficiency.

[0023] Therefore, this application provides a fastening fixture for assembling a splined drive shaft 10 and a hub bearing 20. The fastening fixture will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0024] In one embodiment, reference Figure 2 and Figure 3 The fastening fixture includes a fixture body 41 and a fastening assembly. The fixture body 41 is used to fix the drive shaft bolt 30 to the fixture body via a connecting bolt 44. The fastening assembly includes an elastic element 43 and a mounting element 42. The mounting element 42 is rotatably sleeved on the outer periphery of the fixture body 41, that is, when the mounting element 42 is stationary, the fixture body 41 can rotate relative to the mounting element 42 in the circumferential direction. One end of the elastic element 43 is fixedly connected to the mounting element 42, and the other end is used to abut against the wheel hub bearing 20 or the brake disc 50. The fastening fixture has a fastened state. In the fastened state, the fixture body 41 is connected to the drive shaft bolt 30 via the connecting bolt 44, the elastic element 43 abuts against the wheel hub bearing 20 or the brake disc 50, and the elastic element 43 is in a compressed state.

[0025] Thus, when assembling the drive shaft 10 and the hub bearing 20, the operator can first connect the tooling body 41 and the drive shaft bolt 30 with the connecting bolt 44 to form a whole. Then, the tooling body 41 is screwed on to drive the drive shaft bolt 30 to be tightened into the drive shaft 10. At this time, driven by the drive shaft bolt 30, the entire fastening tooling moves towards the side closer to the drive shaft 10 and the hub bearing 20. The elastic element 43 is sandwiched between the hub bearing 20 (or brake disc 50) and the mounting part 42 and is compressed by the hub bearing 20 (or brake disc 50) and the mounting part 42 to generate an elastic fastening force. The elastic fastening force has the tendency to push the drive shaft 10 towards the end closer to the hub bearing 20. Under the action of the elastic fastening force, the spline 11 on the end face of the drive shaft and the spline 21 on the end face of the bearing can be easily engaged, improving the reliability of the assembly of the drive shaft 10 and the hub bearing 20. Furthermore, since the mounting part 42 is rotatably sleeved on the outer periphery of the tooling body 41, when the tooling body 41 is screwed on and the drive shaft bolt 30 is tightened into the drive shaft 10, the elastic element 43 connected to the mounting part 42 will not rotate with the tooling body 41, thereby avoiding the elastic element 43 from generating circumferential friction with the hub bearing 20 or the brake disc 50, which would hinder the fixing of the drive shaft bolt 30 to the drive shaft 10.

[0026] In one embodiment, during the assembly of the drive shaft bolt 30 and the drive shaft 10, when the tooth tip of the drive shaft end face spline 11 is opposite to the tooth tip of the bearing end face spline 21, the elastic fastening force generated by the elastic element 43 is configured to be greater than the sliding force between the tooth tip of the drive shaft end face spline 11 and the tooth tip of the bearing end face spline 21, thereby causing the drive shaft end face spline 11 and the bearing end face spline 21 to slide from the tooth tip-to-tooth tip state into the normal meshing state (tooth tip-to-tooth root state).

[0027] In one embodiment, the tooling body 41 includes a sleeve, one end of which is fitted onto the head of the drive shaft bolt 30 to initially fix the drive shaft bolt 30 to the sleeve. The sleeve has a connecting cavity extending along its length, and a connecting bolt 44 is disposed within the connecting cavity for threaded connection with the head of the drive shaft bolt 30. Thus, the sleeve provides an initial fixed position for the connecting bolt 44, making it easier for the connecting bolt 44 to be threadedly connected to the head of the drive shaft bolt 30. The head of the drive shaft bolt 30 may have a threaded hole, through which the connecting bolt 44 can pass, connecting the tooling body 41 and the drive shaft bolt 30. In other embodiments, a nut with a threaded hole may be fixedly disposed on the head of the drive shaft bolt 30, and the connecting bolt 44 passes through the nut, thus fixing the connection to the drive shaft bolt 30. Alternatively, a bolt may be fixedly disposed on the head of the drive shaft bolt 30, and the connecting bolt 44 has a threaded hole, through which the bolt on the drive shaft bolt 30 passes. The tooling body 41 can be a solid structure, and the connecting bolts 44 can be welded to the tooling body 41, but are not limited to this.

[0028] In one embodiment, the connecting cavity includes a first connecting cavity 411 and a second connecting cavity 412. The connecting bolt 44 includes a connected head 441 and a threaded rod 442, with the radial dimension of the head 441 being larger than that of the threaded rod 442. The head 441 is located in the second connecting cavity 412, and the threaded rod 442 is located in the first connecting cavity 411. Both the radial dimensions of the second connecting cavity 412 and the head 441 are larger than those of the first connecting cavity 411. Thus, because the radial dimension of the first connecting cavity 411 is smaller and the radial dimension of the head 441 of the connecting bolt 44 is larger, the connecting bolt 44 can be prevented from slipping out of the first connecting cavity 411 from the second connecting cavity 412. Simultaneously, the first connecting cavity 411 and the second connecting cavity 412 also provide a supporting surface for the connecting bolt 44, allowing the connecting bolt 44 to be fixedly connected to the drive shaft bolt 30.

[0029] Furthermore, the fastening fixture also includes an anti-slip component 46. The outer periphery of the anti-slip component 46 abuts against the inner wall of the sleeve. The anti-slip component 46 is located within the second connecting cavity 412 and on the side of the head 441 opposite to the screw 442. The anti-slip component 46 has a through hole 461, the radial dimension of which is smaller than the radial dimension of the head 441, to prevent the connecting bolt 44 from slipping out of the second connecting cavity 412. The through hole 461 also allows tools such as screwdrivers and bitheads to pass through to fasten the connecting bolt 44 to the drive shaft bolt 30.

[0030] In summary, in this embodiment, both ends of the connecting bolt 44 are provided with anti-loosening structures to prevent the connecting bolt 44 from slipping out of the connecting cavity. When fastening fixtures are required, the assemblers can use them directly without having to install the connecting bolt 44 into the connecting cavity, thus saving time and improving efficiency.

[0031] It should be noted that the above-mentioned radial direction refers to... Figure 2 The radial dimension shown in the X direction refers to the maximum length along the X direction. The anti-detachment component 46 can be a hollow sheet, block, or strip structure, but is not limited to these.

[0032] In one embodiment, the fastening fixture further includes a rotary bearing 47, with the mounting member 42 fixedly connected to the outer ring of the rotary bearing 47, and the fixture body 41 fixedly connected to the inner ring of the rotary bearing 47, so that the mounting member 42 is rotatably fitted onto the outer periphery of the fixture body 41. Connecting the mounting member 42 to the fixture body 41 via the rotary bearing 47 reduces the relative friction between the fixture body 41 and the mounting member 42, resulting in smoother relative rotation between them. Alternatively, in another embodiment, one of the mounting member 42 and the fixture body 41 may have a circumferentially extending groove, while the other may have a slider slidably disposed within the groove, similarly enabling a rotatable connection between the mounting member 42 and the fixture body 41.

[0033] Among them, the rotating bearing 47 can be a miniature ball bearing or a small ball bearing to save the volume of the fastening tooling, but is not limited to this.

[0034] In one embodiment, the elastic element 43 is a compression spring, and the tooling body 41 further includes a hook bolt 45, which is generally "J"-shaped. The hook bolt 45 includes a hook portion 451 and a fixing portion 452. The hook portion 451 hooks one end of the compression spring, and the fixing portion 452 is bolted to the mounting part 42, fixing the compression spring to the mounting part 42 and preventing the compression spring from falling off and rotating from the mounting part 42. By using the hook bolt 45, when connecting the compression spring and the mounting part 42, installation or disassembly can be completed simply by hooking or unhooking one end of the compression spring, without the need for additional tools or complex parts.

[0035] For example, the hook portion 451 is a semi-enclosed structure, positioned directly opposite the mounting member 42. The hook portion 451 and the mounting member 42 together form a hook cavity, in which a portion of the compression spring is housed and abuts against both the hook portion 451 and the mounting member 42. The number of hook bolts 45 can be set as needed, and this embodiment does not limit this. In some other embodiments, the elastic element 43 can also be a compressible rubber pad or other compressible elastomer.

[0036] In one embodiment, the mating length between the connecting bolt 44 and the drive shaft bolt 30 is greater than or equal to the maximum compression of the elastic element 43 in the tightened state. This minimizes the risk of the elastic element 43 flying off when the fastening fixture needs to be separated from the drive shaft bolt 30 due to compression. In another embodiment, the mating length between the connecting bolt 44 and the drive shaft bolt 30 can be less than the maximum compression of the elastic element 43 in the tightened state. In this case, to avoid excessive elastic force in the elastic element 43 when the connecting bolt 44 is separated from the drive shaft bolt 30, the elastic coefficient of the elastic element 43 can be segmented. That is, the elastic coefficient of the elastic element 43 gradually increases with increasing compression, and gradually decreases with decreasing compression. This minimizes the elastic force when the compression is small, preventing excessive elastic force when the fastening fixture is separated from the drive shaft bolt 30, thus minimizing the risk of the fastening fixture flying off.

[0037] For example, the elastic element 43 is a compression spring. In the tightened state, the compression spring has a first compression period and a second compression period following the first compression period. In the first compression period, the compression spring changes from its natural state to a compressed state, and the compression spring has a first stiffness coefficient. In the second compression period, the compression spring has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient. That is, in the first compression period, when the compression spring is first compressed, the stiffness coefficient of the compression spring is small. In the second compression period, as the drive shaft bolt 30 gradually penetrates the drive shaft 10, the stiffness coefficient of the compression spring is larger, which can generate a larger deformation force, causing the bearing end face spline 21 to engage with the drive shaft end face spline 11. It is easy to understand that the longer the length of the connection between the connecting bolt 44 and the drive shaft bolt 30, the greater the connection force between the connecting bolt 44 and the drive shaft bolt 30. When the bearing end face spline 21 and the drive shaft end face spline 11 are engaged, and it is necessary to separate the fastening fixture from the drive shaft bolt 30, the connection force between the connecting bolt 44 and the drive shaft bolt 30 becomes smaller and smaller. The spring constant of the compression spring is small when it is first compressed, and the elastic force generated under the same compression amount is also small. Therefore, as the connecting bolt 44 and the drive shaft bolt 30 are gradually separated, the compression spring set above can better match the connection force between the connecting bolt 44 and the drive shaft bolt 30, while ensuring the engagement of the bearing end face spline 21 and the drive shaft end face spline 11 as much as possible, thus preventing the elastic force generated by the compression spring from knocking the fastening fixture away.

[0038] like Figure 2 and Figure 3In the embodiment shown, the compression spring is a truncated cone spring. Starting from the end of the compression spring that is fixedly connected to the mounting part 42, the outer diameter of the compression spring gradually increases. As the degree of compression increases, the spring constant of the compression spring also increases. Those skilled in the art can select a suitable compression spring so that the compression spring has different spring constants at different times, so as to ensure that the bearing end face spline 21 meshes with the drive shaft end face spline 11 and prevent the fastening fixture from flying off.

[0039] In one embodiment, the fastening fixture also has an initial state. In the initial state, the fixture body 41 is connected to the drive shaft bolt 30, a portion of the thread of the drive shaft bolt 30 is connected to the drive shaft 10, and the elastic element 43 has a gap with the wheel hub bearing 20 or the brake disc 50. That is, before the fastening fixture performs its fastening function, a portion of the thread of the drive shaft bolt 30 is already connected to the drive shaft 10, but at this time the elastic element 43 has not yet contacted the wheel hub bearing 20 or the brake disc 50. As the drive shaft bolt 30 is pushed deeper, the fastening fixture switches from the initial state to the fastened state, and the elastic element 43 contacts the wheel hub bearing 20 and is compressed. Thus, when the drive shaft bolt 30 is initially fixed to the drive shaft 10 (only a portion of the thread of the drive shaft bolt 30 passes through the drive shaft 10), the elastic element 43 will not generate a corresponding reaction force on the drive shaft 10, making it easier for the drive shaft bolt 30 and the drive shaft 10 to complete the initial fixation, and thus making it easier for the drive shaft bolt 30 to be pushed deeper and fixed to the drive shaft 10.

[0040] refer to Figure 4 This application also provides an assembly method, employing the fastening fixture described in any of the above embodiments or implementations, including: S100: Fixture body 41 and drive shaft bolt 30 are fixedly connected by connecting bolt 44, so that drive shaft bolt 30 is connected to drive shaft 10; specifically, fixture body 41 can be a sleeve, and connecting bolt 44 is inserted inside the sleeve, so that the operator can screw connecting bolt 44 into the head of drive shaft bolt 30 with a screwdriver, wrench or screwdriver.

[0041] S200: Tighten the drive shaft bolt 30 by means of the tooling body 41; In step S100, the tooling body 41 is formed as a whole by means of connecting bolt 44 and drive shaft bolt 30. The operator can rotate the tooling body 41 to screw the drive shaft bolt 30 into the drive shaft 10; At this time, driven by the drive shaft bolt 30, the entire fastening tooling moves towards the side closer to the drive shaft 10 and the hub bearing 20. The elastic element 43 is sandwiched between the hub bearing 20 (or brake disc 50) and the mounting part 42 and is compressed by the hub bearing 20 (or brake disc 50) and the mounting part 42 to generate an elastic fastening force. The elastic fastening force has the tendency to push the hub bearing 20 towards the end closer to the drive shaft 10. Under the action of the elastic fastening force, the spline 11 on the end face of the drive shaft and the spline 21 on the end face of the bearing can be easily engaged, improving the reliability of the assembly of the drive shaft 10 and the hub bearing 20.

[0042] S300: Loosen the connecting bolt 44 to separate the tooling body 41 and the drive shaft bolt 30. After the spline 11 on the end face of the drive shaft engages with the spline 21 on the end face of the bearing, the operator can loosen the connecting bolt 44 with a wrench or screwdriver to separate the tooling body 41 from the drive shaft bolt 30. At this time, the drive shaft 10 and the hub bearing 20 are assembled.

[0043] In one embodiment, the assembly method further includes: During the process of tightening the drive shaft bolts 30 via the tooling body 41, the hub bearing 20 is rotated circumferentially. That is, while performing step S200, the operator can also rotate the hub bearing 20 or the brake disc 50 circumferentially, which can better engage the drive shaft end face spline 11 with the bearing end face spline 21.

[0044] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A fastening fixture for assembling an end-face spline type drive shaft and a hub bearing, characterized in that, include: A tooling body is used to fix and connect to a drive shaft bolt via a connecting bolt. The tooling body includes a sleeve, one end of which is used to fit over the head of the drive shaft bolt. The sleeve has a connecting cavity extending along its length. The connecting bolt is disposed in the connecting cavity and is used to screw into the head of the drive shaft bolt. The connecting cavity includes a first connecting cavity and a second connecting cavity. The connecting bolt includes a connected head and a screw, the radial dimension of which is larger than the radial dimension of which is larger. The head is located in the second connecting cavity, and the screw is located in the first connecting cavity. Both the radial dimension of the second connecting cavity and the radial dimension of the head are larger than the radial dimension of the first connecting cavity. An anti-detachment component is provided, the outer periphery of which abuts against the inner wall of the sleeve. The anti-detachment component is located in the second connecting cavity and on the side of the head opposite to the screw. The anti-detachment component has a through hole, the radial dimension of which is smaller than the radial dimension of the head. The fastening assembly includes an elastic element and a mounting element. The mounting element is rotatably sleeved on the outer periphery of the tooling body. One end of the elastic element is fixedly connected to the mounting element, and the other end is used to abut against a wheel hub bearing or a brake disc. The fastening tooling has a fastened state. In the fastened state, the tooling body is bolted to the drive shaft, the drive shaft bolt is connected to the drive shaft, the elastic element abuts against the wheel hub bearing or the brake disc, and the elastic element is in a compressed state.

2. The fastening fixture according to claim 1, characterized in that, The head of the drive shaft bolt has a threaded hole, and the connecting bolt passes through the threaded hole.

3. The fastening fixture according to claim 1, characterized in that, The fastening fixture also includes a rotating bearing. The mounting component is fixedly connected to the outer ring of the rotating bearing, and the fixture body is fixedly connected to the inner ring of the rotating bearing, so that the mounting component is rotatably fitted onto the outer periphery of the fixture body.

4. The fastening fixture according to claim 1, characterized in that, The elastic element is a compression spring, and the tooling body also includes a hook bolt, which includes a hook portion and a fixing portion. The hook portion hooks onto one end of the compression spring, and the fixing portion is bolted to the mounting component.

5. The fastening fixture according to claim 1, characterized in that, The mating length between the connecting bolt and the drive shaft bolt is greater than or equal to the maximum compression of the elastic element in the tightened state.

6. The fastening fixture according to claim 1, characterized in that, The elastic element is a compression spring. In the fastened state, the compression spring has a first compression period and a second compression period after the first compression period. During the first compression period, the compression spring changes from a natural state to a compressed state. The compression spring has a first stiffness coefficient. During the second compression period, the compression spring has a second stiffness coefficient, and the first stiffness coefficient is smaller than the second stiffness coefficient.

7. The fastening fixture according to claim 1, characterized in that, The fastening fixture also has an initial state in which the fixture body is bolted to the drive shaft, a portion of the screw of the drive shaft bolt is connected to a portion of the drive shaft, and the elastic element has a gap with the wheel hub bearing or the brake disc.

8. An assembly method, characterized in that, The fastening fixture as described in any one of claims 1 to 7 includes: The tooling body is fixedly connected to the drive shaft bolt using the connecting bolt; The drive shaft bolt is fastened by the tooling body, so that the drive shaft bolt is fixedly connected to the drive shaft; Loosen the connecting bolts to separate the tooling body from the drive shaft bolts.

9. The assembly method according to claim 8, characterized in that, The method further includes: During the process of tightening the drive shaft bolts through the tooling body, the hub bearing or the brake disc is rotated circumferentially along the hub bearing.

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