Reliability test method after bearing installation
By using a bolt with an inner square and a nut with a boss, a torque wrench can be applied directly to the outer ring of the bearing, solving the problem of inaccurate bearing installation reliability testing in the prior art, and realizing the standardization and reliability testing of bearing installation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DALIAN CHANGFENG IND CORP
- Filing Date
- 2026-03-23
- Publication Date
- 2026-05-12
AI Technical Summary
In the existing technology, torque wrenches cannot be directly applied to the outer ring of the bearing, resulting in unreliable fixing of the bearing after installation, which may affect the flexibility of the inner ring of the bearing.
Using a bolt with an inner square and a nut with a boss, a torque wrench is applied directly to the outer ring of the bearing. The accuracy of torque application is ensured by the cooperation of the bolt and nut, and the outer ring of the bearing is observed to rotate within the specified torque range.
This technology enables the use of torque wrenches to reliably test the outer ring of bearings, ensuring the standardization and reliability of bearing installation and avoiding inaccuracies in human judgment and potential overtightening issues.
Smart Images
Figure CN122016310A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the fields of machining technology and testing, and discloses a method for reliability testing of bearings after installation. Background Technology
[0002] Grooved self-lubricating bearings and spherical plain bearings installed on components such as aircraft control systems require quality inspection after installation, including punching and flipping. The bearing outer ring must not rotate within a certain torque range within the bearing bore of the control system component. Currently, torque wrenches and other torque measuring devices cannot directly apply force to the bearing outer ring. After installation, the bearing is typically checked by manually squeezing and rotating the outer ring, a method that is neither standard nor reliable. Sometimes, to prevent the bearing outer ring from rotating within the bearing bore, operators may deepen the punching or increase the flipping, potentially causing the bearing to be too tightly secured and affecting the flexibility of the inner ring within the outer ring. Summary of the Invention
[0003] This invention patent discloses a method for testing the reliability of bearings after installation. It allows a torque wrench to be conveniently used to apply torque to the outer ring of the bearing, and can detect whether the outer ring of the bearing rotates within a certain torque range inside the bearing hole of the control system component.
[0004] According to one aspect of this application, a method for testing the reliability of a bearing after installation is provided, comprising the following steps:
[0005] Remove the inner ring of the bearing that has already been installed on the part, insert the square bolt into the outer ring of the bearing, and tighten it with the nut with the boss. Make sure that the end faces of the square bolt and the nut with the boss are fastened to the two ends of the outer ring of the bearing, and ensure that there is no slippage between the end faces of the square bolt and the nut with the boss and the end face of the outer ring of the bearing when torque is applied.
[0006] Secure the part with the square hole of the bolt facing upwards. Ensure that the axes of the bolt, the nut with the boss, and the outer ring of the bearing are perpendicular to the ground. Insert the square end of a torque wrench into the square hole of the bolt and apply torque smoothly. Observe whether the outer ring of the bearing rotates within the bearing hole of the part. Beforehand, use a marker to draw a mark through the end face of the outer ring of the bearing and the bearing hole to facilitate the determination of whether the outer ring of the bearing rotates.
[0007] The bolt with an inner square is a three-section stepped bolt. One end is hexagonal with the largest diameter inner square hole on the end face. The middle section is cylindrical, and the other end is a threaded section with the smallest diameter. The three sections are coaxial, and each end face is perpendicular to the axis.
[0008] The nut with the boss is in two stepped sections, one end is hexagonal and the other end is an outer cylinder. The nut with the boss has a through internal thread in the middle. The internal thread, hexagonal shape and outer cylinder are all coaxial, and each end face is perpendicular to the axis.
[0009] The internal thread of the nut with the boss mates with the threaded section of the bolt with the internal square.
[0010] The cylindrical outer diameter of the nut with the boss and the middle section of the bolt with the inner square are the same, and both are smaller than the outer diameter of the bearing outer ring, but larger than the inner diameter of the bearing outer ring.
[0011] The nuts with bosses and the bolts with inner squares are made of aluminum alloy to prevent damage to the bearings during clamping.
[0012] The advantages of this application are:
[0013] This invention patent provides a method for testing the reliability of bearings after installation, which allows a torque wrench to conveniently apply torque to the outer ring of the bearing, replacing the need for personnel to judge the reliability of the bearing outer ring fixation by feel. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the part.
[0015] Figure 2 This is a schematic diagram of a bearing.
[0016] Figure 3 This is a schematic diagram of a part equipped with a reliability testing device.
[0017] Figure 4 This is a schematic diagram of a bolt with an inner square.
[0018] Figure 5 This is a schematic diagram of a nut with a boss.
[0019] Among them, 1-1 are control system parts, 1-2 are bearing inner rings, 1-3 are bearing outer rings, 2 are bolts with inner squares, and 3 are nuts with bosses. Detailed Implementation
[0020] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.
[0021] Example 1
[0022] A bearing installation reliability testing device, 1-1 is a control system component; 1-2 is the bearing inner ring; 1-3 is the bearing outer ring; 2 is a bolt with an inner square; 3 is a nut with a boss; vise; torque wrench.
[0023] The shape of the control system component 1-1 is as follows: Figure 1 As shown, two bearings need to be installed. Figure 2 (as shown), and the inner ring 1-2 of the bearing can be removed from the outer ring 1-3 of the bearing.
[0024] The bolt 2 shown has the following shape: Figure 4 As shown, it is a three-section stepped structure. The left section is hexagonal with an inner square hole on the end face, the middle section is cylindrical, and the right section is threaded. The three sections are coaxial, and each end face is perpendicular to the axis.
[0025] The nut 3 with the boss shown has the following shape. Figure 5 As shown, it is a two-stage stepped structure, with the left stage being hexagonal and the right stage being an outer cylinder. The nut 3 with the boss has a through internal thread in the middle. The internal thread is coaxial with both the hexagonal and outer cylinders, and each end face is perpendicular to the axis.
[0026] Vises and torque wrenches are standard products.
[0027] The internal thread of the nut 3 with a boss mates with the right-side thread of the bolt 2 with an internal square.
[0028] The cylindrical section of the nut 3 with the boss and the middle cylindrical section of the bolt 2 with the inner square have the same outer diameter, and both are smaller than the outer diameter of the bearing outer ring 1-3, but larger than the inner diameter of the bearing outer ring 1-3.
[0029] The nut 3 with the boss and the bolt 2 with the inner square are made of aluminum alloy to prevent damage to the bearing during clamping.
[0030] The inner square of the bolt 2 with an inner square fits the outer square of the torque wrench with clearance. The inner square can be matched according to the shape of different torque wrenches.
[0031] The specific work process is as follows:
[0032] 1. The inner ring 1-2 of the bearing of the control system component 1-1 with the bearing installed can be removed from the outer ring 1-3 of the bearing;
[0033] 2. Insert the square bolt 2 into the outer ring 1-3 of the bearing;
[0034] 3. Tighten the nut 3 with the boss and the bolt 2 with the inner square to secure the two ends of the outer ring 1-3 of the bearing. Ensure that the fastening is secure and that there is no slippage between the two ends of the outer ring 1-3 of the bearing and the end faces of the nut 3 with the boss and the bolt 2 with the inner square when torque is applied later.
[0035] 4. Using protective measures such as soft cloth, clamp the operating system part 1-1 in a vise, ensuring that the inner square hole of the bolt 2 with the inner square is facing upwards (to facilitate the application of torque wrench), and ensure that the nut 3 with the boss is as perpendicular as possible to the ground along the axis of the bolt 2 with the inner square, the outer ring of the bearing 1-3, and the torque wrench, which can reduce detection errors.
[0036] 5. Insert the square end of the torque wrench into bolt 2 with the inner square end.
[0037] 6. Apply torque smoothly, ensuring that the nut 3 with the boss, the bolt 2 with the inner square, the outer ring of the bearing 1-3, and the axis of the torque wrench are coaxial.
[0038] 7. When the specified torque is applied, observe whether the outer ring 1-3 of the bearing rotates within the bearing hole of the bearing control system component 1-1. A mark can be made in advance using a marker pen to penetrate the outer ring 1-3 of the bearing and the end face of the bearing hole to facilitate the determination of whether the outer ring of the bearing rotates.
[0039] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any modifications or substitutions made by those skilled in the art within the scope of the technology disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A method for reliability testing of bearings after installation, characterized in that, Includes the following steps: Remove the inner ring of the bearing that has already been installed on the part, insert the square bolt into the outer ring of the bearing, and tighten it with the nut with the boss. Make sure that the end faces of the square bolt and the nut with the boss are fastened to the two ends of the outer ring of the bearing, and ensure that there is no slippage between the end faces of the square bolt and the nut with the boss and the end face of the outer ring of the bearing when torque is applied. Secure the part with the square hole of the bolt facing upwards. Ensure that the axes of the bolt, the nut with the boss, and the outer ring of the bearing are perpendicular to the ground. Insert the square end of a torque wrench into the square hole of the bolt and apply torque smoothly. Observe whether the outer ring of the bearing rotates within the bearing hole of the part. Beforehand, use a marker to draw a mark through the end face of the outer ring of the bearing and the bearing hole to facilitate the determination of whether the outer ring of the bearing rotates.
2. The bearing installation reliability test method according to claim 1, characterized in that, The bolt with an inner square is a three-section stepped bolt. One end is hexagonal with the largest diameter inner square hole on the end face. The middle section is cylindrical, and the other end is a threaded section with the smallest diameter. The three sections are coaxial, and each end face is perpendicular to the axis.
3. The bearing reliability test method after installation according to claim 2, characterized in that, The nut with the boss is in two stepped sections, one end is hexagonal and the other end is an outer cylinder. The nut with the boss has a through internal thread in the middle. The internal thread, hexagonal shape and outer cylinder are all coaxial, and each end face is perpendicular to the axis.
4. The bearing reliability test method after installation according to claim 3, characterized in that, The internal thread of the nut with the boss mates with the threaded section of the bolt with the internal square. The cylindrical outer diameter of the nut with the boss and the middle section of the bolt with the inner square are the same, and both are smaller than the outer diameter of the bearing outer ring, but larger than the inner diameter of the bearing outer ring.
5. The bearing reliability test method according to claim 4, characterized in that, The nuts with bosses and the bolts with inner squares are made of aluminum alloy to prevent damage to the bearings during clamping.