A follow-up structure for an aircraft landing gear and a landing gear door

Abstract

A follow-up structure for an aircraft landing gear and a landing gear door. The follow-up structure includes a connecting bracket, a transmission pull rod, and a connecting joint. The connecting bracket is fixed on the landing gear column. A fork ear is provided on the connecting bracket, and the fork ear is connected to one end of the transmission pull rod through a universal joint. The other end of the transmission pull rod is connected to the end of the connecting joint through another universal joint. The connecting joint is connected to the landing gear door through a bearing ring. The landing gear inclined strut drives the opening and closing of the landing gear door through the follow-up structure.

Description

Technical Field

[0001] The present invention relates to the design of aircraft movement structures and is a follow-up structure for driving the opening and closing of aircraft landing gear doors. Background Art

[0002] The function of the door on an aircraft is to provide a passage for personnel or goods to enter and exit the cabin, or to provide a channel for equipment installation and maintenance. When the door is opened, it provides sufficient movement passage for personnel or goods, and after the door is closed, it maintains the aerodynamic shape of the aircraft. The opening and closing of the door require continuous and regular power input, and a transmission mechanism and a connection structure need to be designed. The key lies in that the design of the transmission mechanism must meet the requirements of the specific movement trajectory of the door. When designing the movement system of the aircraft landing gear door, the opening and closing of the landing gear door need to move synchronously with the landing gear: the door opens when the landing gear is lowered, and the door closes when the landing gear is retracted. Currently, most of the doors on aircraft use special components to achieve the specific movement trajectory of the door through manual control of the power input. The entire movement mechanism includes a control system, a power system, a transmission system, a connection structure, etc. Each part requires installation space to meet the movement requirements. However, the internal space position inside the landing gear fairing is limited, making it difficult to provide a large installation space. In addition, when the door and the landing gear are independently controlled, there is a risk that the movement of the door and the landing gear is inconsistent, which will cause a collision between the landing gear and the door, resulting in a safety accident. To ensure the synchronization of the movement of the door and the landing gear, and to meet the installation requirements within the limited space, and to avoid the collision between the door transmission mechanism and the landing gear during the movement process, a new transmission structure needs to be sought. Therefore, it is necessary to design a transmission mechanism that not only meets the requirements of limited space constraints but also can achieve the synchronous movement of the door and the landing gear. Summary of the Invention

[0003] The purpose of the present invention is to provide a follow-up structure for an aircraft landing gear and a landing gear door. On the premise of meeting the limited space constraints, the landing gear and the landing gear door are connected together. Through this structure, the movement of the landing gear can be directly transmitted to the door, realizing the coordinated and reliable movement of the landing gear and the door, and ensuring the synchronization of the movement of the landing gear and the door.

[0004] A follow-up structure for an aircraft landing gear and a landing gear door, comprising a landing gear inclined column and a landing gear door. It is characterized in that the landing gear door is a double-door structure, and the landing gear inclined column is a parallel double-column structure. The left inclined column is connected and follows the left door through a left follow-up structure, and the right inclined column is connected and follows the right door through a right follow-up structure. There is a connecting angle bar fixedly connected between the connecting brackets of the left follow-up structure and the connecting brackets of the right follow-up structure. The follow-up structure includes a connecting bracket, a transmission pull rod, and a connecting joint. The connecting bracket is fixed on the landing gear column. There is a fork ear on the connecting bracket, and this fork ear is connected to one end of the transmission pull rod through a universal joint. The other end of the transmission pull rod is connected to the end of the connecting joint through another universal joint. The connecting joint is connected to the landing gear door through a bearing ring. The landing gear inclined column drives the opening and closing action of the landing gear door through the follow-up structure.

[0005] The follow-up structure for the aircraft landing gear and the landing gear door is characterized in that the connecting bracket is composed of two semi-enclosing connecting pieces. The two semi-enclosing connecting pieces are fixedly surrounded by the landing gear inclined column through docking holes provided at both ends. There is a fork ear for connecting the universal joint on one side of the semi-enclosing connecting piece, and there is a connecting lug on the other side of the semi-enclosing connecting piece. This connecting lug is fixedly connected to the connecting angle bar connecting the connecting brackets of the left and right follow-up structures.

[0006] The follow-up structure for the aircraft landing gear and the landing gear door is characterized in that the transmission pull rod is a combined component. Fork ears are respectively provided at both ends of the transmission pull rod. The fork ears at both ends of the transmission pull rod can respectively rotate around the central axis of the connecting link. At the same time, the fork ears at both ends of the transmission pull rod are respectively connected to the connecting bracket and the connecting joint through universal joints.

[0007] The follow-up structure for the aircraft landing gear and the landing gear door is characterized in that the connecting joint is a fork ear structure for connecting the universal joint. The root of this fork ear structure is embedded in the bearing ring, and the fork ear rotates freely relative to the bearing ring. The bearing ring is fixed on the door.

[0008] The beneficial effects of the present application are as follows: 1) The follow-up structure of the cabin door uses the movement of the landing gear as the power source for the movement of the landing gear cabin door, eliminating the control system and power system of the traditional movement mechanism. The follow-up system is a pure mechanical structure, which is simple in structure and convenient for installation. The follow-up system uses the movement of the landing gear as the power input, well realizing the synchronization between the landing gear cabin door and the landing gear movement, without the need for separate control and with extremely high reliability. 2) The connecting frame of the follow-up structure is connected to the transmission pull rod and the connecting joint through universal joints, which can release the rotational constraints during the movement of the landing gear and the landing gear cabin door, preventing the pull rod from jamming and resulting in movement failure due to different spatial movement directions during the movement of the landing gear cabin door and the landing gear. 3) The cabin door connecting structure contains a bearing ring, which is a self-made bearing structure. The inner shaft of the bearing structure realizes all the functions of the inner ring of the standard bearing and the inner ring fixing parts, simplifying the number of parts for installing the bearing system; the connecting support arm and the additional piece are both sheet metal structures, greatly reducing the weight of the bearing system and at the same time reducing the size of the bearing system, and can realize reliable connection with the surrounding structures. 4) The length of the transmission pull rod is fixed. The fixed-length pull rod ensures that the distance between the connection points of the cabin door connecting structure and the landing gear connecting structure with the pull rod remains unchanged, facilitating the transmission of the movement of the landing gear to the cabin door and realizing the linkage between the cabin door and the landing gear; at the same time, the fixed length can reduce the vibration during the movement of the cabin door and improve the movement safety. 5) The transmission pull rod can rotate around its own axis, providing local degrees of freedom for the structure, ensuring that the pull rod can release torque during the transmission of spatial movement, reducing its own internal stress, avoiding damage to the transmission structure due to excessive torque during the movement of the pull rod, and improving the safety of the transmission structure.

[0009] The following further describes the present application in detail with reference to the accompanying drawings of the embodiments. Description of the Drawings

[0010] Figure 1 It is a schematic diagram of the follow-up relationship between the aircraft landing gear and the landing gear cabin door.

[0011] Figure 2 It is a schematic diagram of the follow-up structure between the aircraft landing gear and the landing gear cabin door.

[0012] Figure 3 It is a schematic diagram of the outer semi-surrounding connecting piece of the follow-up structure connecting bracket.

[0013] Figure 4 It is a schematic diagram of the inner semi-surrounding connecting piece of the follow-up structure connecting bracket.

[0014] Figure 5 It is a schematic diagram of the connection between the fork ear of the follow-up structure connecting bracket and the universal joint.

[0015] Figure 6Schematic diagram of the transmission pull rod structure of the follow-up structure.

[0016] Figure 7 Schematic diagram of the connection head structure of the follow-up structure.

[0017] Figure 8 Schematic diagram of the connection head structure of the follow-up structure.

[0018] Explanation of the numbers in the figure: 1 left cabin door, 2 right cabin door, 3 left inclined column, 4 right inclined column, 5 left follow-up structure, 6 right follow-up structure, 7 connecting angle bar, 8 connecting bracket, 9 fork ear, 10 universal joint, 11 transmission pull rod, 12 connecting joint, 13 bearing ring, 14 outer semi-surrounding connecting piece, 15 inner semi-surrounding connecting piece, 16 sleeve, 17 fork ear A, 18 fork ear B, 19 bushing, 20 ball, 21 connecting rib. Specific implementation mode

[0019] Referring to the attached drawings, the follow-up structure of the aircraft landing gear and the landing gear door of the present application includes the inclined column of the landing gear and the landing gear door. The landing gear door is a double-door structure, and the inclined column of the landing gear is a parallel double-column structure. The left inclined column 3 of the inclined column of the landing gear is connected and follows the left cabin door 1 through the left follow-up structure 5, and the right inclined column 4 is connected and follows the right cabin door 2 through the right follow-up structure 6. There is a connecting angle bar 7 fixedly connected between the connecting brackets of the left follow-up structure 5 and the connecting brackets of the right follow-up structure 6 to ensure the synchronous follow-up of the two cabin doors.

[0020] The structural principles of the left follow-up structure 5 and the right follow-up structure 6 are the same. Figure 2 Taking the left follow-up mechanism 5 as an example for description. The follow-up structure includes a connecting bracket 8, a transmission pull rod 11 and a connecting joint 12. The connecting bracket 8 is fixed on the left inclined column 3. A fork ear 9 is fixedly connected to the connecting bracket 8. The fork ear 9 is connected to one end of the transmission pull rod 11 through a universal joint 10, and the other end of the transmission pull rod 11 is connected to the end of the connecting joint 12 through another universal joint 10. The connecting joint 12 is connected to the left landing gear door 1 through a bearing ring 13.

[0021] The connecting bracket 8 in the embodiment is two semi-surrounding connecting pieces. The two semi-surrounding connecting pieces are fixedly surrounded by the inclined column of the landing gear through the butt holes and bolts provided at both ends to ensure the immobility of the connecting bracket and the left inclined column 3 of the landing gear; a fork ear 9 connecting the universal joint 10 is fixedly connected to the outer semi-surrounding connecting piece 14, and a connecting ear piece is provided on the inner semi-surrounding connecting piece 15. The connecting ear piece is fixedly connected to the connecting angle bar 7 connecting the connecting brackets of the left and right follow-up structures, as Figure 3 and Figure 4 shown.

[0022] In the embodiment, the transmission tie rod 11 is a screwing assembly composed of a connecting rod, a sleeve 16 and fork ears. Fork ears are respectively arranged at both ends of the transmission tie rod 11, namely fork ear A17 and fork ear B18. Fork ear A17 and fork ear B18 can respectively rotate around the central axis of the connecting rod 11, and the total length of the transmission tie rod 11 remains unchanged. At the same time, fork ear A17 at one end of the transmission tie rod is connected to the connecting bracket 8 through a universal joint 10, and fork ear B18 at the other end is connected to the connecting joint 12 through a universal joint 10, as Figure 6 shown.

[0023] In the embodiment, the connecting joint 12 is a fork ear structure connecting the universal joint 10. The root of this fork ear structure is embedded in the bearing ring 13. The connecting joint 12 can rotate freely relative to the bearing ring 13, and the bearing ring 13 is fixed on the cabin door. As Figure 7 and Figure 8 shown, the periphery of the bearing ring 13 is connected to the skin and longitudinal stiffening frame on the cabin door through three welded connecting ribs 21 by rivets to fix the bearing ring on the cabin door. The bushing 19 and the connecting joint 12 are nested inside the bearing ring 13. The lower part of the connecting joint 12 is provided with an annular inner groove which is connected to the annular inner groove of the bearing ring 13 through balls 20, ensuring that the connecting joint 12 can rotate freely around the bearing ring and ensuring that the connecting joint 12 will not fall out from the inside of the bearing ring. The upper part of the connecting joint 12 is connected to a universal joint 10.

[0024] When the landing gear is lowered, the left inclined column 3 pushes the left cabin door 1 to open through the left follower structure 5, and the right inclined column 4 pushes the right cabin door 2 to open through the right follower structure 6; when the landing gear is retracted, the left inclined column 3 pulls the left cabin door 1 to close through the left follower structure 5, and the right inclined column 4 pulls the right cabin door 2 to close through the right follower structure 6. This structure not only meets the installation requirements in a limited space, but also realizes the coordinated and reliable movement between the landing gear and the cabin door, ensuring the synchronization of the movement of the landing gear and the cabin door.

Claims

1. A follow-up structure of an aircraft landing gear and a landing gear door, comprising a landing gear inclined column and a landing gear door, characterized in that, The landing gear door is of a double-door structure, and the landing gear inclined upright columns are of a parallel double-column structure. The landing gear inclined upright columns include a left inclined upright column and a right inclined upright column that are arranged parallel to each other with a certain interval. The left inclined upright column is connected and follows the left door through a left follower structure, and the right inclined upright column is connected and follows the right door through a right follower structure. There is a connecting angle section fixedly connected between the connecting brackets of the left follower structure and the connecting brackets of the right follower structure. The left follower structure and the right follower structure respectively include connecting brackets, transmission tie rods, and connecting joints. The connecting brackets are fixed on the landing gear upright columns. The connecting bracket of the left follower structure is fixed on the left inclined upright column, and the connecting bracket of the right follower structure is fixed on the right inclined upright column. The connecting brackets are two semi-surrounding connecting pieces. The two semi-surrounding connecting pieces are fixedly surrounded by the landing gear inclined upright columns through the docking holes provided at both ends. On one side of the semi-surrounding connecting piece, there is a fork ear for connecting a universal joint, and on the other side of the semi-surrounding connecting piece, there is a connecting lug. The fork ears of the universal joints on the two connecting brackets are respectively located on the opposite sides of the left inclined upright column and the right inclined upright column. The connecting lug is fixedly connected to the connecting angle section connecting the left and right follower structure connecting brackets. The fork ear on one side of the semi-surrounding connecting piece is connected to one end of the transmission tie rod through a universal joint. The other end of the transmission tie rod is connected to the end of the connecting joint through another universal joint. The transmission tie rod is a combined component. Fork ears are respectively provided at both ends of the transmission tie rod. The fork ears at both ends of the transmission tie rod can respectively rotate around the central axis of the connecting link. At the same time, the fork ears at both ends of the transmission tie rod are respectively connected to the connecting bracket and the connecting joint through universal joints. The total length of the transmission tie rod remains unchanged. The connecting joint is connected to the landing gear door through a bearing ring. The periphery of the bearing ring is connected to the skin and the longitudinal stiffening frame on the door through three welded connecting ribs by rivets. The bearing ring is fixed on the door. The bearing ring on the left door is fixed at one end of the left door close to the right door, and the bearing ring on the right door is fixed at one end of the right door close to the left door. The connecting joint is a fork ear structure for connecting a universal joint. The root of the fork ear structure is embedded in the bearing ring, and the fork ear structure rotates freely relative to the bearing ring. The landing gear inclined upright columns drive the opening and closing actions of the landing gear door through the follower structure.

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