A locking fixture and installation method for a bearing bushing lock nut

Abstract

This invention discloses a locking fixture and installation method for a bearing bushing locking nut, belonging to the field of mechanical assembly technology. The locking nut has toothed blocks and toothed grooves. The locking fixture includes: a circular ring, multiple locking teeth evenly distributed on the inner surface of the circular ring's inner bore, and a wrench connector disposed on the outer circumferential surface of the circular ring. The locking teeth are used to engage with the toothed grooves of the locking nut, and the wrench connector is used to connect a torque wrench. Preferably, the fixture also includes a guide sleeve and a clearance groove. The installation method includes: heat-fitting the bearing bushing to the spindle; installing a retaining sleeve; pre-tightening the locking nut; using the guide sleeve to engage the locking teeth of the fixture with the toothed grooves; applying a specified torque with a torque wrench to tighten; and after the bushing temperature stabilizes, loosening and retightening the locking nut. This invention, through the cooperation of the locking teeth and toothed grooves, achieves precise torque application to the special anti-loosening locking nut, avoiding tool mismatch problems; combined with the heat-fitting and secondary tightening process, it ensures long-term stable axial preload under high interference fit.

Description

Technical Field

[0001] This invention relates to the field of mechanical assembly tool technology, and in particular to a locking fixture and installation method for a bearing bushing locking nut. Background Technology

[0002] In the assembly of numerous machines, such as the spindle system of bearing testing equipment, automotive wheel hub assemblies, precision reducers for industrial robots, large rotating supports, and aerospace actuators, the installation of bearing bushings and lock nuts is a crucial step. The quality of this installation directly affects rotational accuracy, the reliability of axial positioning, and the overall service life of the equipment.

[0003] In the prior art, to effectively prevent locking nuts from loosening under high-speed operation or severe vibration conditions, the industry widely uses locking nuts with special anti-loosening structures. The structure of such locking nuts is as disclosed in patent CN201090614Y, with multiple circumferentially distributed toothed blocks on its outer circumference, forming tooth grooves between adjacent toothed blocks. Other locking nuts have structures such as... Figure 1 As shown, the toothed blocks are integrally molded onto the end face of the lock nut, with toothed grooves formed between adjacent blocks. The anti-loosening washer, which mates with the lock nut, has locking teeth that match the width of the toothed grooves. During installation, the locking teeth of the anti-loosening washer are bent and engaged into the toothed grooves of the lock nut, thus providing a mechanical and reliable anti-loosening effect. However, this lock nut structure, with its excellent anti-loosening performance, presents new challenges for installation tools.

[0004] Traditional open-end wrenches, box wrenches, hook wrenches, or general-purpose socket wrenches are typically designed based on the shape of ordinary hexagonal or round nuts. They cannot effectively and evenly transmit torque when used with the toothed grooves of the aforementioned locking nuts. Forcing the use of mismatched tools not only fails to apply precise tightening torque but also easily damages the teeth or grooves of the locking nut, causing the anti-loosening structure to fail. Therefore, there is an urgent need for a locking fixture and installation method specifically designed for such toothed locking nuts to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the technical problem that the lack of a dedicated installation tool for locking nuts with toothed structures in the prior art makes it impossible to apply locking torque accurately and safely.

[0006] To achieve the above objectives, the present invention proposes the following technical solution: The present invention provides a locking fixture for a bearing bushing locking nut in a first aspect. The locking nut has a plurality of teeth evenly distributed in a ring, with a tooth groove formed between adjacent teeth. The locking fixture includes: a circular ring body, retaining teeth, and a wrench connector. The circular ring body is used to fit onto the outer circumferential surface of the locking nut. A plurality of retaining teeth are evenly distributed in a ring on the inner surface of the circular ring body, and the retaining teeth are used to engage with the tooth grooves of the locking nut. The wrench connector is disposed on the outer circumferential surface of the circular ring body, and the wrench connector is used to connect to a torque wrench.

[0007] Furthermore, a guide sleeve is provided on one side of the annulus, the inner diameter of the guide sleeve being the same as the inner diameter of the annulus, and the guide sleeve is used to fit onto the outer circumferential surface of the lock nut.

[0008] Furthermore, a clearance groove is provided between the wrench connector and the outer peripheral surface of the guide sleeve, the clearance groove being used to provide clearance for the bearing bushing to avoid interference.

[0009] Furthermore, the number of the locking teeth is M, and the number of the grooves on the locking nut is N, satisfying: 0.5N≤M≤N, where M and N are both positive integers.

[0010] Furthermore, the number of locking teeth M is equal to the number of tooth grooves N on the locking nut, and the positions of the M locking teeth and the N tooth grooves correspond one-to-one.

[0011] Furthermore, the annular body, the locking teeth, the wrench connector, and the guide sleeve are integrally formed components, made of alloy steel through machining or casting.

[0012] In a second aspect, the present invention provides a method for installing a bearing bushing locking nut, employing the locking fixture described in any of the preceding claims, comprising the following steps: S1. Install the bearing bushing onto the first journal of the spindle; S2. Install the retaining sleeve on the second journal of the main shaft, with the right end of the retaining sleeve abutting against the left end face of the inner ring of the bearing bushing; S3. Tighten the lock nut onto the external thread of the left half of the second journal; S4. Place the ring of the locking fixture onto the locking nut, and make the teeth on the inner hole of the ring engage with the grooves of the locking nut. S5. Connect the torque wrench to the wrench connector of the locking fixture; S6. Tighten the lock nut by applying the specified tightening torque with a torque wrench.

[0013] Furthermore, in step S4, when the locking fixture is equipped with a guide sleeve, the guide sleeve is first placed on the outer circumferential surface of the locking nut for guidance, and then the locking fixture is pushed to the right. If the locking teeth fail to directly engage in the tooth groove, the locking fixture is rotated at a certain angle and then pushed to the right until the locking teeth engage in the tooth groove.

[0014] Furthermore, the bearing bushing is installed onto the first journal of the spindle via a heat fitting process; after step S6, step S7 is also included: after the bearing bushing temperature stabilizes, the locking nut is loosened again, and the locking nut is tightened again by applying the specified tightening torque with a torque wrench.

[0015] Furthermore, the hot fitting process is as follows: the bearing bushing is heated to 120°C to expand its inner diameter, and then quickly fitted onto the first journal on the spindle; after the bearing bushing cools to room temperature, an interference fit is formed between it and the spindle.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: (1) The locking fixture provided by the present invention has multiple locking teeth on the inner bore surface of its annular body that match the tooth grooves of the locking nut. In use, the locking teeth engage with the tooth grooves to achieve circumferential fixation between the fixture and the locking nut. The wrench connector on the outer circumferential surface of the annular body is a standard interface that can be connected to a universal torque wrench. Thus, the operator can apply a locking torque to the locking nut precisely and evenly using a torque wrench, solving the problem that traditional tools cannot be matched with special tooth groove structures, and avoiding slippage, damage to the nut, and safety hazards caused by tool mismatch.

[0017] (2) By setting a guide sleeve on one side of the ring, the guide sleeve first contacts the outer circumferential surface of the locking nut during installation, which plays a guiding and centering role, ensuring that the rear locking teeth can be smoothly and accurately aligned and locked into the tooth groove, which is especially suitable for operation in narrow or poorly visible installation spaces.

[0018] (3) The design of the relief groove cleverly avoids the protruding structure of the bearing bushing, preventing the tooling from interfering with the bearing bushing during rotation, thus improving the applicability and ease of operation of the tooling.

[0019] (4) The installation method provided by the present invention combines the hot fitting process, the secondary tightening process and the special locking fixture. The hot fitting ensures the interference fit accuracy between the bearing bushing and the spindle; the secondary tightening (tightening again after the bearing bushing temperature stabilizes) compensates for the loss of preload force that may be caused by thermal expansion and contraction and material creep, ensuring the long-term stability and reliability of the final locking force, and significantly improving the assembly quality and service life of the entire spindle system. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a locking nut with anti-loosening teeth in the prior art (the teeth are integrally formed on the end face).

[0022] Figure 2 This is a front view of the locking fixture provided by the present invention.

[0023] Figure 3 for Figure 2 Sectional view of AA.

[0024] Figure 4 This is a schematic diagram of the locking tool provided by the present invention used to lock the lock nut.

[0025] Explanation of reference numerals: 1. Ring body; 2. Clamping teeth; 3. Wrench connector; 4. Guide sleeve; 5. Relief groove; 100. Locking nut; 101. Tooth block; 102. Tooth groove; 200. Bearing bushing; 300. Main shaft; 301. First journal; 302. Second journal; 400. Stop sleeve. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0028] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0029] This embodiment provides a locking fixture for a bearing bushing lock nut, and a method for installing the bearing bushing lock nut using the locking fixture.

[0030] I. Specific Structure of Locking Fixture The locking fixture and method are specifically designed to mate with a locking nut 100 of a particular structure. For example... Figure 1 As shown, the locking nut 100 has a plurality of teeth 101 evenly distributed in a ring on its end face, with a tooth groove 102 formed between two adjacent teeth 101. This structure is common in mechanical systems requiring high reliability and anti-loosening, such as the spindle system of a bearing tester, automotive wheel hub assembly, or aerospace actuators. The locking fixture of this embodiment is designed to apply a locking torque to the locking nut 100 safely and accurately.

[0031] Combination Figures 2 to 3 As shown, the locking fixture in this embodiment mainly includes a ring 1, a locking tooth 2, a wrench connector 3, and preferably a guide sleeve 4 and a relief groove 5.

[0032] The annular body 1 is the main base of the entire tooling. It has a short cylindrical ring structure with a central circular hole. The function of the annular body 1 is to fit over the outer circumference of the locking nut 100, providing support and a force transmission path for the locking teeth 2 and the wrench connector 3. The axial thickness of the annular body 1 can be designed according to actual stress requirements to ensure sufficient structural strength.

[0033] The retaining teeth 2 are components that directly mesh with the toothed grooves 102 of the locking nut 100. Multiple retaining teeth 2 are evenly distributed in a ring on the inner surface of the annular body 1. The shape and size of each retaining tooth 2 match the toothed grooves 102 on the locking nut 100. Specifically, the width of the retaining tooth 2 should be slightly smaller than the width of the toothed groove 102 to form a clearance fit, facilitating insertion and removal; the radial length of the retaining tooth 2 (i.e., the length extending radially inward from the inner surface of the annular body 1) should be sufficient to ensure that it will not slip out of the toothed groove 102 under stress, while also not being too long to touch the bottom thread or journal. The axial thickness of the retaining tooth 2 can be the same as the thickness of the annular body 1, thus forming a complete tooth-shaped protrusion. The evenly distributed ring of multiple retaining teeth 2 ensures uniform torque transmission when meshing with the multiple toothed grooves 102 of the locking nut 100.

[0034] The wrench connector 3 is an interface for connecting an external power or torque wrench. The wrench connector 3 is located on the outer circumferential surface of the annulus 1. Its specific form can be various standard interfaces; for example, the most common is an external square head or external hexagonal head for mating with the inner hole of a standard socket wrench or open-end / box torque wrench; it can also be an internal square hole or internal hexagonal hole for inserting a square head drive torque wrench. The wrench connector 3 and the annulus 1 are preferably integrally formed to ensure strength and accuracy. The wrench connector 3 is typically located at the radially outward extension of the outer circumferential surface of the annulus 1 to provide sufficient lever arm and operating space.

[0035] A guide sleeve 4 is disposed on one side of the annular body 1. The guide sleeve 4 is a thin-walled cylindrical structure coaxially arranged with the annular body 1. Its inner diameter is exactly the same as that of the annular body 1. The function of the guide sleeve 4 is to be pre-fitted onto the outer circumference of the locking nut 100, using the small gap between it and the outer circle of the locking nut 100 to achieve guidance and centering. During operation, the fixture does not directly allow the retaining teeth 2 to "find" the tooth groove 102, but first, the guide sleeve 4 is fitted onto the outer circle of the end of the locking nut 100. Under the guidance of the guide sleeve 4, the center line of the entire fixture automatically coincides with the center line of the locking nut 100, and then the operator pushes the fixture to the right, and the retaining teeth 2 can smoothly slide into the tooth groove 102. This "guide first, engage later" design greatly improves the convenience and success rate of alignment, and is especially suitable for scenarios requiring blind operation.

[0036] Combination Figure 3 and Figure 4As shown, the clearance groove 5 is formed between the outer circumferential surfaces of the wrench connector 3 and the guide sleeve 4. The clearance groove 5 is used to provide clearance for the bearing bushing 200 to avoid interference. When the tooling is fitted onto the locking nut 100, if the position of the wrench connector 3 is not properly designed, it may collide and interfere with the bearing bushing 200 when rotating with the tooling, resulting in the inability to complete the full tightening stroke. The clearance groove 5 is a recessed area formed by cutting. Specifically, at the connection root between the outer circumferential surface of the guide sleeve 4 and the wrench connector 3, a portion of material is removed by machining to form a groove. This clearance groove 5 provides clearance to the left end of the outer ring of the bearing bushing 200, thereby ensuring that the tooling can rotate continuously 360 degrees.

[0037] Optimization of the number of locking teeth: This embodiment limits the number of locking teeth 2. Let the number of locking teeth 2 be M, and the number of tooth grooves on the locking nut 100 be N, where M and N are both positive integers. This embodiment requires that the relationship 0.5N≤M≤N be satisfied. This range has clear technical significance: when M=N, each locking tooth 2 corresponds to one tooth groove 102, achieving full tooth engagement. At this time, all locking teeth 2 share the torque, the force on each locking tooth 2 is minimized, and the stress distribution is most uniform. When M<N and 0.5N≤M, although not all teeth are engaged, as long as at least half of the tooth grooves 102 are locked by the locking teeth 2, sufficient and uniform torque transmission can still be provided. If M<0.5N, there may be a risk of too few stress points, excessive load on a single locking tooth 2, and easy breakage or damage to the tooth groove 102. Furthermore, the optimal solution is M=N, and the positions of the M teeth 2 correspond one-to-one with the N tooth grooves 102. This requires the tooling to have high precision during manufacturing, but the benefit is that it achieves maximum torque transmission area and convenient alignment.

[0038] Manufacturing Materials and Processes: To ensure the reliability, wear resistance, and fatigue strength of the tooling under long-term, high-load use, this embodiment preferably designs the ring 1, the chuck 2, the wrench connector 3, and the guide sleeve 4 as a single integral component. There are two main methods for integral molding: one is machining, where a cylindrical or annular blank of high-strength alloy steel (such as 40Cr or 42CrMo) is selected and machined using processes such as turning, milling, or wire cutting to create all features; the other is precision casting, where, for mass production, investment casting can be used to pour high-temperature alloy steel molten metal to obtain a blank close to the final shape, followed by a small amount of finishing. Regardless of the method used, the material must be alloy steel and undergo appropriate heat treatment (such as tempering, carburizing, and quenching) to ensure that the chuck 2 has sufficient wear resistance and impact resistance.

[0039] II. Specific steps for installing lock nuts This embodiment provides a method for installing a bearing bushing locking nut using the above-described locking fixture. This method is a complete and high-precision assembly process; please refer to [reference needed]. Figure 4 As shown.

[0040] Step S1: Install the bearing bushing.

[0041] The bearing bushing 200 is installed onto the first journal 301 of the spindle 300. The first journal 301 is a precision shaft section on the spindle 300 used to position the bearing bushing 200. This step can be performed using either a cold press fitting or a hot fitting process, the specific choice depending on the size of the interference fit. For applications requiring high precision, as described later in this embodiment, a hot fitting process is preferred. Specifically, the hot fitting process involves heating the bearing bushing 200 to 120°C, causing its inner diameter to expand, and then quickly fitting it onto the first journal 301 on the spindle 300; after the bearing bushing 200 cools to room temperature, an interference fit is formed between it and the spindle 300. Heating to 120°C is a proven safe and effective temperature value, which generates sufficient expansion without adversely affecting the material properties of the bearing bushing 200.

[0042] Step S2: Install the retaining sleeve.

[0043] The retaining sleeve 400 is installed on the second journal 302 of the main shaft 300. The second journal 302 is adjacent to the first journal 301, and the diameter of the second journal 302 is smaller than the diameter of the first journal 301. The retaining sleeve 400 is a ring-shaped part. During installation, it is necessary to ensure that the right end face of the retaining sleeve 400 is tightly pressed against the left end face of the inner ring of the bearing bush 200, providing reliable support for the subsequent axial clamping of the locking nut 100.

[0044] Step S3: Pre-tighten the lock nut.

[0045] Pre-tighten the lock nut 100 onto the external thread of the left half of the second journal 302. Pre-tightening means manually tightening the lock nut 100 until it just contacts the left end face of the retaining sleeve 400, or applying a very small torque (e.g., 5%-10% of the final tightening torque). The purpose of this step is to establish a preliminary threaded connection, preparing for subsequent precise positioning and loading.

[0046] Step S4: Install the locking fixture.

[0047] The annular body 1 of the locking fixture is fitted onto the locking nut 100, and the retaining teeth 2 on the inner surface of the annular body 1 are engaged in the corresponding tooth grooves 102 of the locking nut 100. When the locking fixture is equipped with a guide sleeve 4, the operation is more convenient: first, place the guide sleeve 4 on the outer circumference of the locking nut 100 for guidance, and then push the locking fixture to the right. If the retaining teeth 2 fail to engage directly in the tooth grooves 102, it means that the retaining teeth 2 are pressing against the tooth block 101. In this case, do not use brute force to push; instead, slightly retract the fixture to the left, rotate it by a small angle (e.g., half a tooth pitch angle), and then push the locking fixture to the right again. Usually, repeating this 1-2 times will allow you to hear or feel the retaining teeth 2 smoothly sliding into the tooth grooves 102. At this point, there is no relative movement between the fixture and the locking nut 100 in the circumferential direction.

[0048] Step S5: Connect the torque wrench.

[0049] Select a calibrated torque wrench with an appropriate range. Set the torque wrench to the specified tightening torque value according to the assembly process documents. Then, securely connect the drive head of the torque wrench to the wrench connector 3 on the tightening fixture.

[0050] Step S6: Apply locking torque.

[0051] The operator applies force using a torque wrench with smooth, continuous movements. When the preset torque value is reached, the torque wrench will emit a "click" sound or produce a noticeable unloading action. At this point, applying force should be stopped immediately. The locking nut 100 is then tightened with precise torque. This torque ensures that the correct axial preload is obtained between the bearing bushing 200, the retaining sleeve 400, and the main shaft 300.

[0052] Step S7: Tighten again.

[0053] When the bearing bushing 200 is installed using a heat-fitting process, this embodiment includes step S7 after step S6: After the bearing bushing 200 has stabilized, the locking nut 100 is loosened again, and the specified tightening torque is applied again using a torque wrench to tighten the locking nut 100. This is because the heat-fitting process is characterized by the continuous changes in the dimensions and internal stress of the bearing bushing 200 during the cooling process. If the tightening operation in step S6 is performed before the bearing bushing 200 has completely cooled to room temperature, the applied tightening torque may change (usually decrease) as the bearing bushing 200 further cools and shrinks, resulting in insufficient final preload. The specific operation is as follows: After completing step S6, allow the entire assembly to cool naturally at room temperature until the temperature of the bearing bushing 200 reaches equilibrium with the room temperature, achieving a "temperature stable" state. Then, the operator first loosens the locking nut 100 slightly in the reverse (counterclockwise) direction (e.g., 1 / 4 turn) to break the previous static friction state and release some stress. Finally, completely repeat steps S4, S5, and S6: re-engage the locking fixture, connect the torque wrench, and apply the same specified locking torque as before to tighten the locking nut 100. After such a process cycle of "hot fitting - initial tightening - cooling and stabilization - loosening - secondary tightening," the axial preload acting on the bearing bushing 200 is the most realistic, stable, and in line with design requirements.

[0054] III. Summary of Operating Principles and Beneficial Effects In practical use, the operator first places the annular body 1 onto the outer circumference of the locking nut 100 pre-installed on the spindle. Utilizing the design of the guide sleeve 4 and the clearance groove 5, each tooth 2 on the inner surface is easily and accurately aligned and engaged into the corresponding tooth groove 102 on the locking nut 100. At this point, the fixture and the locking nut 100 are completely locked in the circumferential direction. Then, a torque wrench with a pre-set torque value is connected to the wrench connector 3. Finally, the operator holds the handle of the torque wrench and applies force in the specified direction. When the torque wrench reaches the set torque, it will emit a beep or slip, indicating that the locking nut 100 has been precisely tightened. The entire process is smooth, safe, and the torque transmission is efficient and uniform.

[0055] Through the above structure and method, this invention effectively solves the problem in the prior art of lacking a dedicated installation tool for locking nuts 100 with a toothed groove 102 structure. The precise fit between the retaining teeth 2 and the toothed groove 102 achieves slip-free torque transmission between the tool and the nut; the design of the guide sleeve 4 and the relief groove 5 improves the ease of operation and adaptability in complex spaces; the optimized number of retaining teeth 2 ensures uniform force distribution and protects the anti-loosening structure of the locking nut 100; and the combination of heat fitting and secondary tightening installation methods ensures the stability of the interference fit and the durability of the preload from a process perspective. Therefore, this invention significantly improves the installation quality, efficiency, and safety of locking nuts with special anti-loosening structures.

[0056] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A locking fixture for a bearing bushing locking nut, wherein a plurality of toothed blocks (101) are evenly distributed in a ring on the locking nut (100), and a toothed groove (102) is formed between two adjacent toothed blocks (101), characterized in that, The locking fixture includes: A ring (1) is used to fit around the outer circumferential surface of a lock nut (100); The locking teeth (2) are arranged in a ring on the inner surface of the annular body (1). The locking teeth (2) are used to engage in the tooth groove (102) of the locking nut (100). A wrench connector (3) is disposed on the outer circumferential surface of the annulus (1), and the wrench connector (3) is used to connect to a torque wrench.

2. The locking fixture for a bearing bushing locking nut according to claim 1, characterized in that, A guide sleeve (4) is provided on one side of the annular body (1). The inner diameter of the guide sleeve (4) is the same as the inner diameter of the annular body (1). The guide sleeve (4) is used to fit on the outer circumferential surface of the locking nut (100).

3. The locking fixture for a bearing bushing locking nut according to claim 2, characterized in that, A relief groove (5) is provided between the outer circumferential surface of the wrench connector (3) and the guide sleeve (4). The relief groove (5) is used to make room for the bearing bushing to avoid interference.

4. The locking fixture for a bearing bushing locking nut according to claim 1, characterized in that, The number of the locking teeth (2) is M, and the number of the grooves on the locking nut (100) is N, satisfying: 0.5N≤M≤N, where M and N are both positive integers.

5. The locking fixture for a bearing bushing locking nut according to claim 4, characterized in that, The number M of the locking teeth (2) is equal to the number N of the grooves on the locking nut (100), and the positions of the M locking teeth (2) and the N grooves (102) correspond one-to-one.

6. The locking fixture for a bearing bushing locking nut according to claim 2, characterized in that, The ring (1), the tooth (2), the wrench connector (3), and the guide sleeve (4) are integral components formed by machining or casting of alloy steel.

7. A method for installing a bearing bushing locking nut, employing the locking fixture described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Install the bearing bushing (200) onto the first journal (301) of the main shaft (300); S2. Install the retaining sleeve (400) on the second journal (302) of the main shaft (300), and the right end of the retaining sleeve (400) abuts against the left end face of the inner ring of the bearing bushing (200); S3. Pre-tighten the lock nut (100) onto the external thread of the left half of the second journal (302); S4. The ring body (1) of the locking fixture is sleeved on the locking nut (100), and the teeth (2) on the inner hole surface of the ring body (1) are engaged in the tooth groove (102) of the locking nut (100); S5. Connect the torque wrench to the wrench connector (3) of the locking fixture; S6. Apply the specified tightening torque using a torque wrench to tighten the lock nut (100).

8. The method for installing a bearing bushing locking nut according to claim 7, characterized in that, In step S4, when the locking fixture is provided with a guide sleeve (4), the guide sleeve (4) is first placed on the outer circumferential surface of the locking nut (100) for guidance, and then the locking fixture is pushed to the right. If the locking tooth (2) fails to directly engage in the tooth groove (102), the locking fixture is rotated at a certain angle and then pushed to the right until the locking tooth (2) engages in the tooth groove (102).

9. The method for installing a bearing bushing locking nut according to claim 7, characterized in that, The bearing bushing (200) is installed onto the first journal (301) of the spindle (300) by a heat fitting process; After step S6, step S7 is also included: after the temperature of the bearing bushing (200) stabilizes, the locking nut (100) is loosened again, and the locking nut (100) is tightened again by applying the specified tightening torque with a torque wrench.

10. The method for installing a bearing bushing locking nut according to claim 9, characterized in that, The hot fitting process is as follows: the bearing bush (200) is heated to 120°C to expand its inner diameter, and then quickly fitted into the first journal 301 on the main shaft (300); after the bearing bush (200) cools to room temperature, an interference fit is formed between it and the main shaft (300).

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