A movable surface rotation-stopping breakage safety connecting structure

Abstract

The utility model belongs to the technical field of aircraft connecting structure, disclose a movable face rotation -stopping breakage safety connecting structure, including nested bolt subassembly, lug subassembly, anti -loose subassembly and joint bearing, nested bolt subassembly connects lug subassembly and joint bearing, joint bearing is established in the two middle of lug subassembly, anti -loose subassembly fixes lug subassembly and joint bearing relative nested bolt subassembly's position, nested bolt subassembly is the combination bolt formed by solid bolt and hollow bolt nesting. The utility model has realized the breakage safety level of verifiable, has definitely provided the two -level independent redundant force transmission path of bolt and lug, so that the joint is no longer " single point failure " key spare.

Description

Technical Field

[0001] This utility model belongs to the technical field of aircraft connection structure, and relates to an aircraft movable surface mounting connection structure, specifically a movable surface anti-rotation and damage safety connection structure. Background Technology

[0002] The connection joints between aircraft moving surfaces such as ailerons and rudders and actuation mechanisms are critical force-transmitting components, and their reliability directly affects flight safety. The currently prevalent single-bolt connection structure has significant shortcomings: First, it carries the risk of single-point failure; a breakage of the main load-bearing bolt can lead to immediate failure of the control surface, which does not comply with modern aviation damage safety design principles. Second, under continuous aircraft vibration, traditional anti-loosening measures are prone to failure, leading to loose connections, affecting control accuracy, and accelerating structural fatigue. Third, it lacks adaptability to installation deviations and structural deformations, easily generating additional stress. Utility Model Content

[0003] Therefore, this utility model provides a safety connection structure for preventing rotational damage to the moving surface, which can provide redundant force transmission paths, has multiple anti-loosening mechanisms, and can adapt to motion deviations, so as to meet the safety and reliability requirements of airworthiness regulations for moving surface connections.

[0004] The technical solution of this utility model is as follows: A safety connection structure for preventing rotational failure of a movable surface includes a nested bolt assembly, an ear assembly, an anti-loosening component, and a spherical bearing. The nested bolt assembly connects the ear assembly and the spherical bearing. The spherical bearing is located in the middle of the two ear assemblies. The anti-loosening component fixes the position of the ear assembly and the spherical bearing relative to the nested bolt assembly. The nested bolt assembly is a combination bolt formed by nesting solid bolts and hollow bolts.

[0005] Furthermore, the hollow bolt and the solid bolt are coaxial, with the hollow bolt sleeved outside the smooth shank of the solid bolt. The hollow bolt and the solid bolt have a clearance fit or a transition fit. The hollow bolt abuts against one side of the lug assembly, and the threaded end of the hollow bolt passes through the lug assembly and the spherical bearing in sequence before engaging with the anti-loosening component.

[0006] Furthermore, the ear assembly includes a combined single ear and a combined double fork ear, the combined single ear being mounted on a spherical bearing, and the combined double fork ear being mounted on a nested bolt assembly.

[0007] Furthermore, the combined single ear is composed of 3 layers of sub-ear plates stacked together, and each side of the combined double fork ear is composed of 2 layers of sub-ear plates stacked together.

[0008] Furthermore, the sub-ear pieces of the combined single ear and combined double fork ear are connected by fastening bolts.

[0009] Furthermore, the anti-loosening component includes an anti-rotation component, a first slotted self-locking nut, and a second slotted self-locking nut. The anti-rotation component is located outside the nested bolt assembly and provides a lower limit to the lower lug assembly. The first slotted self-locking nut is located outside the hollow bolt and provides an upper limit to the upper lug assembly. The second slotted self-locking nut is located outside the solid bolt and provides a limit to the hollow bolt.

[0010] Technical effects: 1. A verifiable level of failure safety has been achieved: Two independent redundant force transmission paths for bolts and lugs have been clearly provided, making the joint no longer a critical "single point of failure". Its design ensures that the failure of any single component is an "acceptable" or "controllable" failure mode, greatly improving the safety of the entire flight control system.

[0011] 2. Increased reliability of load paths: Multiple parallel paths not only provide safety redundancy, but also improve the overall damage tolerance of the joint, making it insensitive to minor defects and damage.

[0012] 3. Functional integrity assurance: The joint bearings and anti-loosening design ensure that even if a component fails, the remaining structure can still maintain a stable connection and smooth movement, fully meeting the stringent requirements of CCAR-25-R4 and other airworthiness regulations for the strength, rigidity and failure modes of the control system.

[0013] 4. Facilitates non-destructive testing: The structure of the combined lugs and nested bolts facilitates routine visual inspection and endoscopy, making it easy to detect potential damage and achieving a perfect combination of breakable safety design and maintainability. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] Figure 2 This diagram illustrates the installation of solid bolts, hollow bolts, and anti-rotation components.

[0016] 101-Solid bolt, 102-Hollow bolt, 103-Anti-rotation component, 104-Slotted self-locking nut 1, 105-Slotted self-locking nut 2, 106-Custom bearing, 107-Combined single ear, 108-Combined double fork ear, 109-Cotter pin. Detailed Implementation

[0017] The features and illustrative embodiments of various aspects of this utility model will now be described in detail. Numerous specific design details are set forth in the following detailed description to provide a more complete understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of this utility model by illustrating examples of it. This utility model is by no means limited to any specific setup and method set forth below, but covers any improvements, substitutions, and modifications to the structure, method, and device without departing from the spirit of this utility model. In the drawings and the following description, any parts not exhaustively described are considered to be common knowledge or conventional practices in the art.

[0018] It should be noted that, where there is no conflict, the embodiments of this utility model and the features therein can be combined with each other, and the various embodiments can be referenced and cited in turn. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Example 1: A safety connection structure for preventing rotational damage on a movable surface includes a nested bolt assembly, an ear assembly, an anti-loosening component, and a spherical bearing. The nested bolt assembly connects the ear assembly and the spherical bearing. The spherical bearing is located in the middle of the two ear assemblies. The anti-loosening component fixes the position of the ear assembly and the spherical bearing relative to the nested bolt assembly. The nested bolt assembly is a combination bolt formed by nesting solid bolts 101 and hollow bolts 102.

[0020] Hollow bolt 102 is coaxial with solid bolt 101. Hollow bolt 102 is sleeved on the outside of the smooth rod part of solid bolt 101. Hollow bolt 102 and solid bolt 101 have a clearance fit or transition fit. Hollow bolt 102 abuts against one side of lug assembly. The threaded end of hollow bolt 102 passes through lug assembly and spherical bearing in sequence and then engages with anti-loosening component.

[0021] The ear assembly includes a single ear 107 and a double fork ear 108. The single ear 107 is mounted on a spherical bearing, and the double fork ear 108 is mounted on a nested bolt assembly.

[0022] The combined single ear 107 is composed of 3 layers of sub-ear pieces stacked together, while the combined double fork ear 108 has 2 layers of sub-ear pieces stacked together on each side.

[0023] The sub-ear plates of the combined single ear 107 and the combined double fork ear 108 are connected by fastening bolts.

[0024] The anti-loosening component includes an anti-rotation member 103, a first slotted self-locking nut 104, and a second slotted self-locking nut 105. The anti-rotation member 103 is located outside the nested bolt assembly and limits the lower lug assembly. The first slotted self-locking nut 104 is located outside the hollow bolt 102 and limits the upper lug assembly. The second slotted self-locking nut 105 is located outside the solid bolt 101 and limits the hollow bolt 102.

[0025] Example 2: An aircraft moving surface connection structure that meets the CCAR-25.607 anti-loosening requirements and the CCAR-25.657 damage safety and load requirements airworthiness clauses. Through the synergistic effect of nested redundant bolt design, dual anti-loosening mechanism and customized joint bearings, the reliability and safety of the control system are ensured under extreme vibration, alternating loads and unilateral failure conditions. It is suitable for high-reliability connections between critical moving surfaces such as ailerons, rudders, elevators and the airframe.

[0026] A safety connection structure for preventing rotational damage to aircraft moving surfaces, characterized in that it includes: a nested bolt assembly of solid bolts 101, hollow bolts 102, a lug assembly of single lugs 107, a combination of double fork lugs 108, a double anti-loosening component of anti-rotation 103, slotted self-locking nuts 104 and 105, and a custom-made spherical bearing 106, etc. The nested bolt assembly consists of a solid bolt 101 and a hollow bolt 102. The hollow bolt 102 is coaxial with the solid bolt 101 and is sleeved on the outside of the smooth rod portion of the solid bolt 101. The two are in clearance fit or transition fit. The bolt head of the solid bolt abuts against one side of the combined double fork lug 108. Its threaded end passes through the combined single lug, the spherical bearing and the combined double fork lug in sequence and then engages with the slotted self-locking nuts 104 and 105.

[0027] The ear assembly includes a combined single ear 107 and a combined double fork ear 108. The combined single ear 107 consists of three sub-ears, which overlap and are fixed together by multiple sets of bolts. A custom bearing 106 is installed in the ear hole of the combined single ear. The combined double fork ear 108 consists of two sub-ears on each side, which are fixed together by multiple sets of bolts. The combined single ear 107 and the combined double fork ear 108 are coaxially connected by the nested bolt assembly. The custom-made spherical plain bearing 106 is press-fitted into the bearing bore of the combined single lug 107. The smooth portion of the solid bolt serves as a pivot pin passing through the inner ring of the custom-made spherical plain bearing. The dual anti-loosening component includes: The anti-rotation component has a slot at one end that matches the shape of the bolt head of the hollow bolt 102, which is snapped and fixed to the bolt head. The other end is fixed to the side of the combined single ear by a fastening screw to prevent the solid bolt from rotating relative to the bolt. The first slotted self-locking nut 104 and the second slotted self-locking nut 105 are respectively tightened to the threaded ends of solid bolts and hollow bolts to a specified torque. Their slots are aligned with the pin holes on the bolts, and cotter pins are inserted for mechanical locking.

[0028] Both the combined single ear 107 and the combined double fork ear 108 are composed of two or more sub-ear pieces stacked together. Each sub-ear piece is connected by multiple sets of fastening bolts, thereby forming a redundant force transmission structure of the ear piece itself.

[0029] The head of the hollow bolt 102 may have the same or different structure as the head of the solid bolt 101, preferably a hexagonal head or a dodecagonal head. A groove is provided at the end of the head of the hollow bolt 102 to engage with the solid bolt 101.

[0030] The anti-rotation member 103 is made of high-strength alloy steel or stainless steel and is placed under the bolt head of the hollow bolt 102. The anti-rotation boss of the anti-rotation member is inserted into the anti-rotation hole reserved on one side of the combined double fork lug 108.

[0031] The customized spherical bearing 106 is a maintenance-free self-lubricating spherical bearing with its own lubricating material. It consists of an outer bearing ring, an inner bearing ring, and a lock nut. One end of the outer bearing ring is a flange, and the other end is provided with an external thread. It is tightened with the lock nut to form a single lug 107, allowing free deflection within a certain angle range.

[0032] The working principle of this utility model is as follows: Normal loads are mainly borne by the hollow bolts 102 in the nested bolt assembly. When the hollow bolts 102 fail and break due to extreme conditions, the load they bear will be immediately transferred to the solid bolts 101 through the structural contact surface, ensuring the continuity of the force transmission path and realizing the safety function of connecting bolts in case of failure.

[0033] In the ear plate assembly, the sub-ear plates of the combined single ear 107 and combined double fork ear 108 jointly bear the transmission of the load on the moving surface. When one of the sub-ear plates cracks or breaks and fails, the load component it bears is transmitted to the other sub-ear plates that are fixed to it through the connecting bolts, forming a redundant failure safety function of the ear plate assembly.

[0034] The dual anti-loosening assembly completely eliminates the possibility of connection loosening from two dimensions: preventing bolt rotation and nut loosening. The anti-rotation component 103 prevents the solid bolt 101 and hollow bolt 102 from rotating; the self-locking nuts 104 and 105 and the cotter pin 109 provide two sets of nut loosening measures.

[0035] The custom-designed spherical bearing 106 compensates for the angular deviation that occurs when the moving surface is in motion, ensuring that the connection point is always under good stress.

[0036] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A safety connection structure for preventing rotational damage to a movable surface, characterized in that, It includes a nested bolt assembly, an ear assembly, an anti-loosening assembly, and a spherical bearing. The nested bolt assembly connects the ear assembly and the spherical bearing. The spherical bearing is located in the middle of the two ear assemblies. The anti-loosening assembly fixes the position of the ear assembly and the spherical bearing relative to the nested bolt assembly. The nested bolt assembly is a combination bolt formed by nesting solid bolts (101) and hollow bolts (102).

2. The safety connection structure for preventing rotational damage of a movable surface according to claim 1, characterized in that, The hollow bolt (102) is coaxial with the solid bolt (101). The hollow bolt (102) is sleeved on the outside of the smooth rod part of the solid bolt (101). The hollow bolt (102) and the solid bolt (101) are in clearance fit or transition fit. The hollow bolt (102) abuts against one side of the lug assembly. The threaded end of the hollow bolt (102) passes through the lug assembly and the spherical bearing in sequence and then engages with the anti-loosening component.

3. The safety connection structure for preventing rotational damage of a movable surface according to claim 1, characterized in that, The ear assembly includes a combined single ear (107) and a combined double fork ear (108), the combined single ear (107) being mounted on a spherical bearing and the combined double fork ear (108) being mounted on a nested bolt assembly.

4. The safety connection structure for preventing rotational damage of a movable surface according to claim 3, characterized in that, The combined single ear (107) is composed of 3 layers of sub-ear plates stacked together, and the combined double fork ear (108) is composed of 2 layers of sub-ear plates stacked together on each side.

5. The safety connection structure for preventing rotational damage of a movable surface according to claim 4, characterized in that, The sub-ear pieces of the combined single ear (107) and combined double fork ear (108) are connected by fastening bolts.

6. The safety connection structure for preventing rotational damage of a movable surface according to claim 2, characterized in that, The anti-loosening component includes an anti-rotation component (103), a first slotted self-locking nut (104), and a second slotted self-locking nut (105). The anti-rotation component (103) is located outside the nested bolt assembly and limits the lower lug assembly. The first slotted self-locking nut (104) is located outside the hollow bolt (102) and limits the upper lug assembly. The second slotted self-locking nut (105) is located outside the solid bolt (101) and limits the hollow bolt (102).

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