Connecting rod node anti-lock test device and test method

Abstract

The invention belongs to the field of aircraft structure design, and particularly relates to a connecting rod node anti-lock test device and method, and the device consists of a single-lug assembly, a double-lug assembly, and an accompanying test bearing. The double-lug assembly comprises cylindrical split double lugs, a sliding bush and a fixed bush. The single-lug assembly is nested in the split double-lug, is assembled with the double-lug through a bolt and comprises a single lug and an anti-rotation flat plate, the single lug is an integral piece and can simulate clamping stagnation of a bearing, one side of the anti-rotation flat plate is meshed with a key groove of the single-lug simulation piece through a boss, and the other side of the anti-rotation flat plate is fixed to the double-lug simulation piece through a safety pin; and the accompanying bearings are respectively arranged on the left side and the right side of the outer side of the cylindrical double-lug. The device can verify the durability of the connecting rod node.

Description

Technical Field

[0001] This application belongs to the field of aircraft structural design, and specifically relates to a test device and test method for anti-lock testing of connecting rod nodes. Background Technology

[0002] In aircraft structures, connecting rod nodes are crucial connecting components. A typical connecting rod node structure generally consists of bearings, single or double lugs, bushings, and fasteners. To ensure the performance and reliability of the connecting rod node structure, critical connecting rod node areas typically employ a dual-path sliding design. Through meticulous design, in addition to establishing a first kinematic pair between the bearings in the connecting rod node, another sliding path is established between the bearing and the pin. In connecting rod node structures with bearings, if the bearing seizes up, it is essential to ensure that the connecting rod node can overcome the static friction between the bearing inner ring and the bolt surface, as well as the static friction at the bearing end face, to achieve effective sliding. This sliding is distinct from the primary sliding between the inner and outer rings of the bearing and is referred to as secondary sliding. The operating mode of the two sliding paths is achieved by precisely setting the frictional forces at different parts of the connecting rod node; therefore, it is necessary to measure the frictional torque of the connecting rod node structure to ensure the effectiveness of the secondary sliding mode.

[0003] Previous tests on the friction coefficients of materials used in connecting rod joints determined the friction coefficients of each friction pair, providing a basis for the secondary sliding design of the connecting rod joint structure. However, the break-in state of the test specimens, the load magnitude, and the lubrication conditions all affect the friction coefficients of the friction pairs, resulting in significant dispersion. This makes it impossible to accurately determine the activation timing and friction torque of the primary and secondary sliding of the connecting rod joint structure through quantitative calculations, and cannot effectively represent the relationship between the friction torques when the primary and secondary sliding of the connecting rod joint structure are activated. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a test device for anti-locking of connecting rod nodes, comprising:

[0005] Single-ear assembly, dual-ear assembly, and test bearing assembly;

[0006] The dual-ear assembly includes a split dual-ear right part (1), a split dual-ear right part (2), a drive cover (3), and a bolt (5). The split dual-ear right part (1) and the split dual-ear right part (2) are connected to the dual-ear assembly by screws through the mounting holes on the mounting side. The single-ear assembly is set between the dual-ear right part (1) and the split dual-ear right part (2). The bolt (5) passes through the ear holes of the dual-ear assembly and the ear holes of the single-ear assembly and is connected to the nut (10). The anti-rotation plate (12) is set between the split dual-ear right part (2) and the single-ear assembly. One side of the anti-rotation plate (12) engages with the keyway on the end face of the single-ear assembly through a boss, and the other side is fixed to the split dual-ear right part (2) by a safety pin (13).

[0007] The drive cover (3) is fixed to the split double ear right part (1) by screws. The drive cover (3) has a drive hole (4) coaxial with the ear hole of the double ear assembly. The drive motor achieves the rotation of the double ear assembly by applying torque to the drive hole (4).

[0008] The test bearing assembly is located outside the double-ear assembly, with one on each side, to support the double-ear assembly and reduce rotational friction.

[0009] Preferably, the first fixing bushing (6) and the second fixing bushing (7) are respectively fitted into the left and right holes of the double ears.

[0010] Preferably, the test bearing assembly includes a test deep groove ball bearing (14) and an end load body (15), the end load body (15) being fitted onto the outer ring of the test deep groove ball bearing (14) and connected to the fixing device.

[0011] Preferably, the sliding bushing (8) is installed between the second fixed bushing (7) and the bolt (5).

[0012] Preferably, a washer (9) is provided in front of the nut (10).

[0013] A method for testing the anti-locking mechanism of a connecting rod node, using the aforementioned anti-locking testing device for the connecting rod node, is characterized by comprising the following steps: installing the double-ear assembly into the test fixture and fixing the single-ear assembly;

[0014] Tighten the nut (10) so that the axial force between the double-ear assembly and the single-ear assembly is 0 kN, ensuring that the bolt (5) does not rotate;

[0015] The torque driving the dual-ear assembly is gradually increased from zero until the safety pin (13) is sheared. After shearing, the dual-ear assembly is driven to perform a certain angle test and the torque change curve between the single and dual ears and the torque when the safety pin (13) is sheared are recorded.

[0016] Preferably, the dual-ear assembly is installed into the test fixture, and the single-ear assembly is fixed in place;

[0017] Tighten the nut (10) so that the axial force between the double-ear assembly and the single-ear assembly is 0 kN, ensuring that the bolt (5) does not rotate;

[0018] A given radial force is applied to one ear;

[0019] The torque driving the dual-ear assembly is gradually increased from zero until the safety pin (13) is sheared. After shearing, the dual-ear assembly is driven to perform a certain angle test and the torque change curve between the single and dual ears and the torque when the safety pin (13) is sheared are recorded.

[0020] Preferably, the dual-ear assembly is installed into the test fixture, and the single-ear assembly is fixed in place;

[0021] Tighten the nut (10) so that the axial force between the double-ear assembly and the single-ear assembly is 0 kN, ensuring that the bolt (5) does not rotate;

[0022] Apply a given radial force to one ear; remove the safety pin (13).

[0023] Drive both ears to rotate at a certain rate and record the torque change curve between the single and double ears.

[0024] Preferably, a torque meter is provided between the drive motor and the drive hole (4).

[0025] Preferably, the torque meter is connected to a computer for recording data.

[0026] Compared to existing devices, this device is easier to load; it has good interchangeability and can be reused; it has fewer influencing factors, and the data obtained after applying the same load twice through tooling can be processed to remove the load torque value generated by the test bearing; finally, the frictional torque between the bearing inner ring and the bolt surface under the condition of bearing jamming at the connecting rod node can be accurately and effectively determined by the shearing torque of the safety pin. At the same time, this device can verify the durability of the connecting rod node. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a test device for anti-locking of connecting rod nodes;

[0028] Figure 2 This is a side view of a test device for anti-locking of connecting rod nodes. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings. Figures 1-2 As shown, this application provides a test device for anti-locking of connecting rod nodes, comprising:

[0030] Single-ear assembly, dual-ear assembly, and test bearing assembly;

[0031] The dual-ear assembly includes a split dual-ear right part (1), a split dual-ear right part (2), a drive cover (3), and a bolt (5). The split dual-ear right part (1) and the split dual-ear right part (2) are connected to the dual-ear assembly by screws through the mounting holes on the mounting side. The single-ear assembly is set between the dual-ear right part (1) and the split dual-ear right part (2). The bolt (5) passes through the ear holes of the dual-ear assembly and the ear holes of the single-ear assembly and is connected to the nut (10). The anti-rotation plate (12) is set between the split dual-ear right part (2) and the single-ear assembly. One side of the anti-rotation plate (12) engages with the keyway on the end face of the single-ear assembly through a boss, and the other side is fixed to the split dual-ear right part (2) by a safety pin (13).

[0032] The drive cover (3) is fixed to the split double ear right part (1) by screws. The drive cover (3) has a drive hole (4) coaxial with the ear hole of the double ear assembly. The drive motor achieves the rotation of the double ear assembly by applying torque to the drive hole (4).

[0033] The test bearing assembly is located outside the double-ear assembly, with one on each side, to support the double-ear assembly and reduce rotational friction.

[0034] Preferably, the first fixing bushing (6) and the second fixing bushing (7) are respectively fitted into the left and right holes of the double ears.

[0035] Preferably, the test bearing assembly includes a test deep groove ball bearing (14) and an end load body (15), the end load body (15) being fitted onto the outer ring of the test deep groove ball bearing (14) and connected to the fixing device.

[0036] Preferably, the sliding bushing (8) is installed between the second fixed bushing (7) and the bolt (5).

[0037] Preferably, a washer (9) is provided in front of the nut (10).

[0038] A method for testing the anti-locking mechanism of a connecting rod node, using the aforementioned anti-locking testing device for the connecting rod node, is characterized by comprising the following steps: installing the double-ear assembly into the test fixture and fixing the single-ear assembly;

[0039] Tighten the nut (10) so that the axial force between the double-ear assembly and the single-ear assembly is 0 kN, ensuring that the bolt (5) does not rotate;

[0040] The torque driving the dual-ear assembly is gradually increased from zero until the safety pin (13) is sheared. After shearing, the dual-ear assembly is driven to perform a certain angle test and the torque change curve between the single and dual ears and the torque when the safety pin (13) is sheared are recorded.

[0041] Preferably, the dual-ear assembly is installed into the test fixture, and the single-ear assembly is fixed in place;

[0042] Tighten the nut (10) so that the axial force between the double-ear assembly and the single-ear assembly is 0 kN, ensuring that the bolt (5) does not rotate;

[0043] A given radial force is applied to one ear;

[0044] The torque driving the dual-ear assembly is gradually increased from zero until the safety pin (13) is sheared. After shearing, the dual-ear assembly is driven to perform a certain angle test and the torque change curve between the single and dual ears and the torque when the safety pin (13) is sheared are recorded.

[0045] Preferably, the dual-ear assembly is installed into the test fixture, and the single-ear assembly is fixed in place;

[0046] Tighten the nut (10) so that the axial force between the double-ear assembly and the single-ear assembly is 0 kN, ensuring that the bolt (5) does not rotate;

[0047] Apply a given radial force to one ear; remove the safety pin;

[0048] Drive both ears to rotate at a certain rate and record the torque change curve between the single and double ears.

[0049] Preferably, a torque meter is provided between the drive motor and the drive hole (4).

[0050] Preferably, the torque meter is connected to a computer for recording data.

[0051] Compared to existing devices, this device is easier to load; it has good interchangeability and can be reused; it has fewer influencing factors in measurement, and the data obtained after applying the same load twice through tooling can be processed to remove the load torque value generated by the test bearing; finally, the frictional torque between the bearing inner ring and the bolt surface under the condition of bearing jamming at the connecting rod node is accurately and effectively determined by the shearing torque of the safety pin. At the same time, this device can determine the secondary sliding starting torque of the connecting rod node and verify the durability of the connecting rod node.

[0052] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included 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 test device for preventing locking of connecting rod nodes, characterized in that, include: Single-ear assembly, dual-ear assembly, and test bearing assembly; The dual-ear assembly includes a split dual-ear right part (1), a split dual-ear right part (2), a drive cover (3), and a bolt (5). The split dual-ear right part (1) and the split dual-ear right part (2) are connected to the dual-ear assembly by screws through the mounting holes on the mounting side. The single-ear assembly is set between the dual-ear right part (1) and the split dual-ear right part (2). The bolt (5) passes through the ear holes of the dual-ear assembly and the ear holes of the single-ear assembly and is connected to the nut (10). The anti-rotation plate (12) is set between the split dual-ear right part (2) and the single-ear assembly. One side of the anti-rotation plate (12) engages with the keyway on the end face of the single-ear assembly through a boss, and the other side is fixed to the split dual-ear right part (2) by a safety pin (13). The drive cover (3) is fixed to the split double ear right part (1) by screws. The drive cover (3) has a drive hole (4) coaxial with the ear hole of the double ear assembly. The drive motor achieves the rotation of the double ear assembly by applying torque to the drive hole (4). The test bearing assembly is located outside the double-ear assembly, with one on each side, to support the double-ear assembly and reduce rotational friction.

2. The anti-locking test device for connecting rod nodes as described in claim 1, characterized in that, It also includes a first fixed bushing (6) and a second fixed bushing (7) which are respectively installed into the left and right holes of the double ears.

3. The anti-locking test device for connecting rod nodes as described in claim 1, characterized in that, The test bearing assembly includes a test deep groove ball bearing (14) and an end load body (15). The end load body (15) is fitted onto the outer ring of the test deep groove ball bearing (14) and connected to the fixing device.

4. The anti-locking test device for connecting rod nodes as described in claim 1, characterized in that, The sliding bushing (8) is installed between the second fixed bushing (7) and the bolt (5).

5. The anti-locking test device for connecting rod nodes as described in claim 1, characterized in that, A washer (9) is provided in front of the nut (10).

6. A method for testing the anti-locking mechanism of a connecting rod node, using the anti-locking test device for a connecting rod node as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Install the dual-ear assembly into the test fixture and fix the single-ear assembly; Tighten the nut (10) so that the axial force between the double-ear assembly and the single-ear assembly is 0 kN, ensuring that the bolt (5) does not rotate; The torque driving the dual-ear assembly is gradually increased from zero until the safety pin (13) is sheared. After shearing, the dual-ear assembly is driven to perform a certain angle test and the torque change curve between the single and dual ears and the torque when the safety pin (13) is sheared are recorded.

7. The anti-locking test method for connecting rod nodes as described in claim 6, characterized in that, Install the dual-ear assembly into the test fixture and fix the single-ear assembly; Tighten the nut (10) so that the axial force between the double-ear assembly and the single-ear assembly is 0 kN, ensuring that the bolt (5) does not rotate; A given radial force is applied to one ear; The torque driving the dual-ear assembly is gradually increased from zero until the safety pin (13) is sheared. After shearing, the dual-ear assembly is driven to perform a certain angle test and the torque change curve between the single and dual ears and the torque when the safety pin (13) is sheared are recorded.

8. The anti-locking test method for connecting rod nodes as described in claim 6, characterized in that, Install the dual-ear assembly into the test fixture and fix the single-ear assembly; Tighten the nut (10) until the axial force between the double-ear assembly and the single-ear assembly is 0 kN, ensuring that the bolt (5) does not rotate; remove the safety pin (13). A given radial force is applied to one ear; Drive both ears to rotate at a certain rate and record the torque change curve between the single and double ears.

9. The anti-locking test method for connecting rod nodes as described in claim 6, characterized in that, A torque meter is installed between the drive motor and the drive hole (4).

10. The anti-locking test method for connecting rod nodes as described in claim 6, characterized in that, The torque meter is connected to a computer to record data.

Images