A drive mechanism for a variable chord wing

Abstract

This invention discloses a drive device for a variable chord length wing, belonging to the field of variable-length aircraft structural design. It includes a drive motor, a lead screw drive system, a linkage system, and nested shear plates. The drive device and the variable chord length wing rib are both installed between the wing's front and rear spars. The drive device works in conjunction with the variable chord length wing rib. The lead screw drive system includes a lead screw, a corner box, a positioning plate, and a drive nut. The lead screw is fixed to the wing's front spars via the corner box and positioning plate. The drive device is powered by the drive motor, and the lead screw drive system converts the rotation of the lead screw into the translational displacement of the drive nut. The drive nut moves on the lead screw, driving the wing's rear spars to move back and forth via the linkage system. This invention can drive a variable chord length wing, changing the wing area and aspect ratio to optimize the aircraft's lift-to-drag ratio, flight speed, and maneuverability; it can also compensate for the torsional resistance of a variable chord length wing with a flexible structure.

Description

Technical Field

[0001] This invention belongs to the field of variable-length aircraft structural design, specifically relating to a drive device for a variable-chord wing. Background Technology

[0002] Variant aircraft can change their aerodynamic shape during flight to meet the needs of the flight environment and achieve optimal aerodynamic performance when performing different tasks in different flight environments. Variable chord wings can adjust the aspect ratio and wing area by changing the wing chord length, thereby optimizing the aircraft's lift-to-drag ratio, flight speed, and maneuverability.

[0003] Variable chord length wings can be achieved by using deformable ribs in conjunction with the expansion and contraction of a flexible skin. The deformable ribs need to provide good support for the flexible skin as the wing chord length changes. The flexible skin needs to possess in-plane deformation capability and out-of-plane load-bearing capacity, while the deformable ribs and flexible skin must achieve uniform and coordinated deformation. For example, a deformable rib based on a date-shaped unit cell uses a date-shaped flexible unit cell structure expanded and connected to form the deformable rib, which then cooperates with the flexible skin. When the wing undergoes chordal deformation, the spacing of the longitudinal ribs of the flexible skin can change uniformly, ensuring uniform support and coordinated deformation of the flexible skin by the deformable ribs.

[0004] A variable chord wing with deformable ribs requires a drive mechanism to be installed between the front and rear spars of the wing to change the distance between them, which in turn changes the wing chord length by deforming the variable chord ribs.

[0005] Because the flexible skin has insufficient shear resistance, it reduces the torsional stiffness of the wing. For variable chord wings, nested shear plates need to be installed between the front and rear spars of the wing to improve the torsional resistance of the wing section. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention discloses a drive device for a variable chord length wing. The device designed in this invention can drive the variable chord length wing, causing changes in the wing area and aspect ratio; it can also compensate for the torsional resistance of flexible structures.

[0007] This invention is implemented as follows:

[0008] A drive device for a variable chord length wing includes a drive motor, a lead screw drive system, a linkage system, and a nested shear plate. The drive device and the variable chord length wing rib are both installed between the wing's front and rear spars. The drive device works in conjunction with the variable chord length wing rib. The lead screw drive system includes a lead screw, a corner box, a positioning plate, and a drive nut. The lead screw is fixed to the wing's front spars via the corner box and positioning plate. The drive device is powered by the drive motor, and the lead screw drive system converts the rotation of the lead screw into the translational displacement of the drive nut. The drive nut moves on the lead screw, which in turn drives the wing's rear spars to move back and forth via the linkage system. The nested shear plate of this invention is used to improve the torsional resistance of the wing section.

[0009] Furthermore, the lead screw is divided into a drive section and a threaded section. The drive section is located in front of the wing front spars, and the threaded section is located behind the wing front spars. The drive section has a first shoulder and a second shoulder at both ends, and a lead screw gear is set between the two shoulders. The threaded section has an external thread, and the length of the threaded section is greater than the stroke of the drive nut. The internal thread of the drive nut is adapted to the external thread of the lead screw. The outer side of the drive nut is square, and double lugs are symmetrically set on both sides. The double lugs are horizontally set in the center of both sides of the drive nut. The drive nut moves on the lead screw, which drives the wing rear spars to move back and forth through the linkage system.

[0010] Furthermore, the corner box is an open box segment composed of three side wall panels, a support plate, and a connecting plate; the three side wall panels form a C-shaped segment with one open side, the length of which is the length of the outer side of the first and second shoulders; the support plate and the connecting plate are rectangular plates, and the dimensions of the support plate and the connecting plate are consistent with the end of the C-shaped segment. The support plate is welded to the front end of the C-shaped segment, and the connecting plate is welded to the rear end of the C-shaped segment; the support plate has a shaft hole with a diameter larger than the diameter of the lead screw, and the center of the hole is offset towards the opening direction of the C-shaped segment, so that the installed lead screw gear part is exposed outside the corner box and meshes with the gear on the motor; the connecting plate has a groove with an opening direction consistent with the opening direction of the C-shaped segment, and the width and depth of the groove meet the requirements of lead screw assembly and are greater than the diameter of the lead screw; the connecting plate has connecting holes near the four right angles.

[0011] Furthermore, the drive motor is mounted in front of the wing front spar, located on one side of the corner box opening; the drive gear fixed on the motor output shaft meshes with the lead screw gear on the corner box opening side.

[0012] Furthermore, the positioning plate is a rectangular thin plate with the same side length as the connecting plate. The positioning plate has connecting holes and shaft holes with reference to the position and size of the openings on the support plate and connecting plate of the corner box. The corresponding positions of the front spar web plate of the wing have the same connecting holes and shaft holes. When the positioning holes on the connecting plate, positioning plate and front spar web plate of the corner box are matched, the shaft holes of the three are coaxial. When the lead screw is installed, the lead screw drive section is placed in the corner box through the opening of the corner box and positioned by the shaft shoulders at both ends.

[0013] Furthermore, the threaded section of the lead screw is passed through the shaft holes of the positioning plate and the front beam web in sequence, and the position is adjusted until the positioning holes of the positioning plate, the corner box connecting plate, and the front beam web are aligned. The screw is then fixed by passing through the positioning holes of the three parts from inside the corner box.

[0014] Furthermore, the linkage system comprises two sets, symmetrically installed on both sides of the lead screw; each set of the linkage system includes three links, designated as link number 1. a - b pole number 2 b - c and pole number 3 b - d pole number 1 a - b of a Point hinge to the drive nut, moving along the wing chord; Rod No. 2 b - c pole number 1 a - b and pole number 3 b - d exist b Point hinge; Rod No. 2 b - c of c Point hinge fixed to the wing front spars; Rod No. 3 b - d of d Point hinge to the rear wing spars, along a straight line c - d Motion; when the linkage system moves, a The point moves along the chord of the wing, stick number 1. a - b Follow a The point moves and rotates simultaneously, for b The point provides a vertical thrust, making b Point at pole number 2 b - c Rotation about point c under constraint; hinged at b pole number 3 at the point b - d As it rotates, it provides thrust along the wing chord direction to point d, causing... d The aircraft moves along the wing chord length under the constraint of the rear wing spars.

[0015] Furthermore, when the wing chord length is at its minimum, the linkage system... c Point and d When the point distance is at its minimum, the drive nut is in its first extreme position; when the wing chord length is at its maximum, the linkage system... c Point and d At its maximum distance, the drive nut is in the second extreme position. When the wing chord length needs to be changed, the drive motor drives the drive gear to rotate forward or backward according to the deformation requirements. The lead screw rotates under the action of torsional torque, causing the drive nut to move along the wing chord length direction. Rod No. 1, hinged to the drive nut... a - b of a The point moves along the wing chord direction and passes through pole number 1. a - b pole number 2 b - c and pole number 3 b - d Coordinated motion, linkage system c Point and dWhen the distance between the points changes, the distance between the front spar and the rear spar of the wing changes; after the rear spar of the wing reaches the predetermined position, the drive motor stops, and the drive nut self-locks to fix the position.

[0016] Furthermore, the nested shear plate is used to improve the torsional resistance of the wing segment. The nested shear plate includes a fixed plate and a sliding plate, which are installed between the front spar and the rear spar of the wing. The upper and lower edges of the fixed plate are folded into grooves, allowing the sliding plate to slide within them. One end of the fixed plate and the sliding plate is bent at a right angle and has a connecting hole, and is fixed to the web of the front and rear spars with bolts. The nested shear plate has a large shear stiffness. When the wing segment is subjected to torsional moment, the fixed plate and the sliding plate restrain each other to improve the torsional resistance.

[0017] Compared with the prior art, the drive device for a variable chord wing of the present invention has the following advantages:

[0018] This invention can drive a variable chord length wing, changing the wing area and aspect ratio to optimize the aircraft's lift-to-drag ratio, flight speed, and maneuverability; it can also compensate for the torsional resistance of a variable chord length wing with a flexible structure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a drive device for a variable chord wing;

[0020] Figure 2 This is a schematic diagram of a screw drive system for a drive mechanism of a variable chord wing. a ) is a lead screw system, ( b ) is the lead screw, ( c ) are corner boxes and positioning plates, ( d ( ) is a schematic diagram of the corner box opening;

[0021] Figure 3 A schematic diagram of a linkage system for a drive mechanism of a variable chord wing;

[0022] Figure 4 This is a schematic diagram of a nested shear plate for a drive mechanism used in a variable chord wing.

[0023] Among them, 1-wing front spars, 2-wing rear spars, 3-screw drive system, 4-linkage system, 5-nested shear plate, 6-variable chord length wing rib, 7-drive motor, 8-screw, 9-corner box, 10-positioning plate, 11-drive nut, 12-drive section, 13-threaded section, 14-first shoulder, 15-second shoulder, 16-screw gear, 17-side wall plate, 18-support plate, 19-connecting plate, 20-fixed plate, 21-sliding plate. Detailed Implementation

[0024] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the following examples provide a more detailed description of the invention. It should be noted that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0025] like Figure 1 As shown, the drive device of the present invention includes a drive motor 7, a lead screw drive system 3, a linkage system 4, and a nested shear plate 5. This drive device is installed between the wing front spars 1 and the wing rear spars 2, and is used in conjunction with the variable chord length wing rib 6. The drive device is powered by the drive motor 7, which converts the rotation of the lead screw 8 into the translational displacement of the drive nut 11 via the lead screw drive system 3, and then into the displacement of the wing rear spars 2 via the linkage system 4. The nested shear plate 5 of the present invention is used to improve the torsional resistance of the wing section.

[0026] The aforementioned lead screw drive system 3 includes a lead screw 8, a drive nut 11, an angle box 9, and a positioning plate 10. For example... Figure 2 ( a As shown in the figure.

[0027] The lead screw 8 is divided into a drive section 12 and a threaded section 13, which are fixed to the wing front spars 1 via an angle box 9 and a positioning plate 10. The drive section 12 is located in front of the wing front spars 1, and the threaded section 13 is located behind the wing front spars 1. The drive section 12 has a first shoulder 14 and a second shoulder 15 at both ends, and a lead screw gear 16 is located between the two shoulders. The threaded section 13 has external threads, and its length is greater than the stroke of the drive nut 11. Figure 2 ( b As shown in the figure.

[0028] The drive nut 11 has an internal thread that matches the external thread of the lead screw 8. Its outer side is square, and two symmetrical lugs are arranged on both sides, horizontally positioned at the center of both sides of the drive nut 11. The drive nut 11 moves on the lead screw 8, driving the rear beam to move back and forth via the linkage system 4.

[0029] Corner box 9 is an open box segment consisting of three side wall panels 17, a support plate 18, and a connecting plate 19, such as... Figure 2 ( cAs shown in the diagram. Three sidewall plates 17 form a C-shaped section with one open side, its length approximately equal to the length of the outer sides of the two shaft shoulders of the lead screw 8 drive section 12. The support plate 18 and connecting plate 19 are rectangular plates with side lengths matching the dimensions of the C-shaped section ends. The support plate 18 is welded to the front end of the C-shaped section, and the connecting plate 19 is welded to the rear end. A shaft hole is opened on the support plate 18, with a diameter slightly larger than the diameter of the lead screw 8. The center of the hole is offset towards the opening direction of the C-shaped section, allowing the installed lead screw gear 16 to protrude beyond the corner box 9 and mesh with the gear on the motor. A groove is opened on the connecting plate 19, with its opening direction consistent with the opening direction of the C-shaped section. The width and depth of the groove meet the assembly requirements of the lead screw 8 and are greater than the diameter of the lead screw 8. Connecting holes are opened near the four right angles on the connecting plate 19. The center positions of the holes in the corner box 9 support plate 18 and connecting plate 19 are as follows... Figure 2 ( d As shown in the figure.

[0030] Positioning plate 10 is a rectangular thin plate with the same side length as connecting plate 19. Connecting holes and shaft holes are made according to the positions and sizes of the openings in corner box 9, support plate 18, and connecting plate 19. The corresponding positions on the web of the wing front spade 1 have the same connecting holes and shaft holes. When the positioning holes on corner box 9, connecting plate 19, positioning plate 10, and front spade web are aligned, the shaft holes of all three are coaxial. Figure 2 ( c As shown in the figure.

[0031] When installing the lead screw 8, place the drive section 12 of the lead screw 8 inside the corner box 9 through the opening of the corner box 9 and position it with the shoulders at both ends; further, pass the threaded section 13 of the lead screw 8 through the shaft holes of the positioning plate 10 and the front beam web in sequence, adjust the position until the positioning holes of the positioning plate 10, the positioning holes of the connecting plate 19 of the corner box 9 and the positioning holes of the front beam web are aligned, and fix it with bolts passing through the positioning holes of the three from the inside of the corner box 9.

[0032] like Figure 3 As shown, the linkage system 4 consists of two sets, symmetrically installed on both sides of the lead screw 8. Each set of linkage system 4 includes three links, namely link number 1. a - b pole number 2 b - c and pole number 3 b - d Rod a - b of a The point is hinged to the drive nut 11 and moves along the wing chord; the rod b - c pole a - b and rod b - d exist b Point hinge; rod b - c of c Point hinge to wing front spars 1, fixed; rod b - d of d Point hinge to wing rear spars 2, along a straight line c - d Motion. When linkage system 4 moves, a The point moves along the chord length of the wing, and the rod...a - b Follow a The point moves and rotates simultaneously, for b The point provides a vertical thrust, making b Point on pole b - c Rotation about point c under constraint; hinged at b The rod at the point b - d As it rotates, it provides thrust along the wing chord direction to point d, causing... d The aircraft moves along the wing chord direction under the constraint of the rear spar 2.

[0033] To overcome the loss of torsional resistance in the airfoil caused by the use of a flexible structure, this invention adds a nested shear plate 5 to compensate for the torsional resistance of the airfoil, such as... Figure 4 As shown, the nested shear plate 5 includes a fixed plate 20 and a sliding plate 21, installed between the front spar 1 and the rear spar of the wing. The upper and lower edges of the fixed plate 20 are folded into grooves, allowing the sliding plate 21 to slide within them. One end of the fixed plate 20 and the sliding plate 21 is bent at a right angle and has a connecting hole, and is fixed to the web of the front and rear spars with bolts. The nested shear plate 5 has a large shear stiffness. When the wing section is subjected to torsional moment, the fixed plate 20 and the sliding plate 21 restrain each other to improve the torsional resistance.

[0034] The drive motor 7 is mounted in front of the wing front spars 1, located on one side of the opening of the corner box 9. The drive gear fixed on the motor output shaft meshes with the lead screw gear 16 on one side of the opening of the corner box 9.

[0035] When the wing chord length is at its minimum, the linkage system 4 c Point and d When the point distance is at its minimum, drive nut 11 is in the first extreme position; when the wing chord length is at its maximum, the linkage system 4... c Point and d When the point distance is at its maximum, the drive nut 11 is in the second extreme position.

[0036] When it is necessary to change the wing chord length, the drive motor 7 drives the drive gear to rotate forward or in reverse according to the deformation requirements, and the lead screw 8 rotates under the action of torsional torque, so that the drive nut 11 moves along the wing chord length direction.

[0037] Furthermore, the rod hinged to the drive nut 11 a - b of a The point moves along the wing chord direction, passing through the rod. a - b pole b - c And rod b - d The coordinated motion of the linkage system 4 c Point and d The distance between the points changes, and the distance between the front spar 1 and the rear spar 2 of the wing changes as well.

[0038] Furthermore, after the wing rear spars 2 reaches the predetermined position, the drive motor 7 stops, and the drive nut 11 self-locks and fixes the position.

[0039] The following specific data examples illustrate the driving device of the present invention:

[0040] In this example, the distance between the front spar 1 and the rear spar 2 of the wing is a minimum of 600 mm and a maximum of 900 mm. The variable chord length rib 6 adopts a deformable rib based on a date-shaped unit cell, and the wing chord length can vary within a range of 300 mm. The distance between adjacent deformable ribs is 800 mm.

[0041] The lead screw thread section 13 is 450mm long and has an external thread diameter of 30mm; the first shoulder 14 and the second shoulder 15 are both 40mm in diameter and 3mm thick; the lead screw gear 16 is 5mm thick and 70mm in diameter. The distance from the lead screw gear to the first shoulder 14 is 20mm, the distance from the second shoulder 15 to the lead screw gear 16 is 140mm, and the distance from the thread section 13 to the second shoulder 15 is 75mm.

[0042] The corner box 9 has a wall thickness of 3mm. The outer dimensions of the support plate 18 and connecting plate 19 are 78mm × 68mm. One side wall panel measures 78mm × 180mm, and two side wall panels measure 68mm × 180mm. The opening of the connecting plate 19 is 48mm wide and 53mm deep; the diameter of the connecting hole is 6.5mm, and the distance from the hole to the edge of the connecting plate is 7.5mm. The diameter of the shaft hole in the support plate 18 is 32mm, and the distance from the center of the hole to the edge of the opening on one side of the support plate is... d It is 26mm.

[0043] The positioning plate 10 is 3mm thick, with dimensions of 78mm × 68mm, a shaft hole diameter of 32mm, a connecting hole diameter of 6.5mm, and a distance of 7.5mm from the edge of the positioning plate. The corner box 9, the positioning plate 10, and the web of the wing front spars 1 are connected by M6 bolts and nuts.

[0044] The drive nut 11 has a rectangular cross-section of 60mm × 50mm, a length of 30mm, and an internal thread hole diameter of 30mm. The internal thread is compatible with the external thread of the lead screw. Two lugs are horizontally positioned at the center of both sides of the drive nut. The lugs are rectangular with a semicircle; the rectangle measures 15mm × 40mm, the semicircle radius is 15mm, and the lug thickness is 5mm. A 5mm diameter hole is drilled at the center of the semicircle. The distance between the two lugs is 5.1mm, and the total depth of the two lugs is 25mm.

[0045] In linkage system 4, link 1 a - b 270mm in length, pole number 2 b - c 487mm in length, pole number 3 b - d The length is 450mm. The main cross-section of the connecting rod is 15mm × 10mm, and the material is structural steel. Rod No. 1 a - bThe end that connects to the drive nut has a single lug with a thickness of 5mm and a length of 20mm at its mid-plane. A through hole with a diameter of 5mm is drilled 7.5mm from the end, and the end is beveled into a radius of 7.5mm. (Rod #1) a - b pole number 2 b - c pole number 3 b - d Install the corresponding connector at the end of connection point b.

[0046] When the distance between the front spar 1 and the rear spar 2 of the wing is at its minimum, the stick... a - b of a The chordal distance from the end of the wing's front spar to the rear spar is approximately 65mm; when the distance between the wing's front spar 1 and the wing's rear spar 2 is at its maximum, the rod... a - b of a The chordal distance from the end to the wing front spars is approximately 470 mm; the difference between the two is the stroke of the drive nut 11, which is 405 mm.

[0047] The fixed plate 20 and sliding plate 21 of the nested shear plate 5 are both 500mm long, 200mm high, and 3mm thick. The fixed end is 20mm wide and has 3 connecting holes with a diameter of 6.5mm and a spacing of 60mm. They are fixed with M6 bolts and nuts. The sliding groove on the fixed plate 20 is 5mm wide and 5mm deep.

[0048] The drive motor 7 must be able to rotate in both forward and reverse directions, and its output power must be sufficient to overcome the torque generated by the elastic force of the variable chord length rib 6, the in-plane tension of the flexible skin, and the resistance of the threaded pair. In this example, the drive motor selected has an output power of 10W, a length of 150mm, and a diameter of 60mm. The drive gear has a thickness of 5mm and a diameter of 70mm.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A drive device for a variable chord length airfoil, characterized in that, The drive device includes a drive motor (7), a lead screw drive system (3), a linkage system (4), and a nested shear plate (5); The drive unit and the variable chord length rib (6) are both installed between the front wing spars (1) and the rear wing spars (2). The drive unit is used in conjunction with the variable chord length rib (6). The lead screw drive system (3) includes a lead screw (8), an angle box (9), a positioning plate (10), and a drive nut (11); the lead screw (8) is fixed to the front spar (1) of the wing through the angle box (9) and the positioning plate (10); The drive device is powered by a drive motor (7), and the rotation of the lead screw (8) is converted into the translational displacement of the drive nut (11) through the lead screw drive system (3). The drive nut (11) moves on the lead screw (8) and drives the wing rear beam (2) to move back and forth through the linkage system (4). The lead screw (8) is divided into a drive section (12) and a threaded section (13). The drive section (12) is located in front of the wing front spars (1), and the threaded section (13) is located behind the wing front spars (1). The drive section (12) has a first shoulder (14) and a second shoulder (15) at both ends, and a lead screw gear (16) is set between the two shoulders. The threaded section (13) has an external thread, and the length of the threaded section (13) is greater than the stroke of the drive nut (11). The internal thread of the drive nut (11) is adapted to the external thread of the lead screw (8). The outer side of the drive nut (11) is square, and double lugs are symmetrically set on both sides. The double lugs are horizontally set in the center of both sides of the drive nut. The drive nut (11) moves on the lead screw (8) and drives the wing rear spars (2) to move back and forth through the linkage system (4). The linkage system (4) consists of two sets, symmetrically installed on both sides of the lead screw (8); each set of linkage system (4) includes three links, designated as link number 1. ab pole number 2 bc and pole number 3 bd pole number 1 ab of a The point is hinged to the drive nut (11) and moves along the wing chord direction; rod No. 2 bc pole number 1 ab and pole number 3 bd exist b Point hinge; Rod No. 2 bc of c Point hinge fixed to the wing front spars; Rod No. 3 bd of d Point hinge to the rear wing spars, along a straight line cd Motion; when the linkage system moves, a The point moves along the chord of the wing, stick number 1. ab Follow a The point moves and rotates simultaneously, for b The point provides a vertical thrust, making b Point at pole number 2 bc Rotation about point c under constraint; hinged at b pole number 3 at the point bd As it rotates, it provides thrust along the wing chord direction to point d, causing... d The aircraft moves along the wing chord length under the constraint of the rear wing spars.

2. The drive device for a variable chord wing according to claim 1, characterized in that, The corner box (9) is an open box segment consisting of three side wall panels (17), a support plate (18), and a connecting plate (19); the three side wall panels (17) form a C-shaped segment with one side open, and the length of the C-shaped segment is the length of the outer side of the first shoulder (14) and the second shoulder (15); the support plate (18) and the connecting plate (19) are rectangular plates, and the dimensions of the support plate (18) and the connecting plate (19) are consistent with the end of the C-shaped segment. The support plate (18) is welded to the front end of the C-shaped segment. The connecting plate (19) is welded to the rear end of the C-shaped section; the support plate (18) has a shaft hole with a diameter greater than that of the lead screw (8), and the center of the hole is offset towards the opening direction of the C-shaped section, so that the installed lead screw gear part is exposed outside the corner box and meshes with the gear on the motor; the connecting plate (19) has a groove with the opening direction consistent with that of the C-shaped section, and the width and depth of the groove meet the requirements of lead screw assembly and are greater than the diameter of the lead screw (8); the connecting plate (19) has connecting holes near the four right angles.

3. A drive device for a variable chord wing according to claim 2, characterized in that, The drive motor (7) is installed in front of the wing front spar (1) and located on the side of the opening of the corner box (9); the drive gear fixed on the motor output shaft meshes with the lead screw gear (16) on the side of the opening of the corner box.

4. A drive device for a variable chord wing according to claim 2, characterized in that, The positioning plate (10) is a rectangular thin plate with the same side length as the connecting plate (19). The positioning plate (10) opens connecting holes and shaft holes with reference to the position and size of the openings of the support plate (18) and connecting plate (19) of the corner box. The corresponding positions of the front spar web of the wing open the same connecting holes and shaft holes. When the positioning holes on the connecting plate (19), positioning plate and front spar web of the corner box are matched, the shaft holes of the three are coaxial. When installing the lead screw (8), place the lead screw drive section (12) inside the corner box through the opening of the corner box (9) and position it with the shoulders at both ends; further, pass the lead screw thread section (13) through the shaft holes of the positioning plate (10) and the front beam web in sequence, adjust the position until the positioning holes of the positioning plate, the corner box connecting plate, and the front beam web are aligned, and fix it with bolts passing through the positioning holes of the three from inside the corner box.

5. A drive device for a variable chord wing according to claim 1, characterized in that, When the wing chord length is at its minimum, the linkage system c Point and d When the point distance is at its minimum, the drive nut (11) is in the first extreme position; when the wing chord length is at its maximum, the linkage system... c Point and d When the point distance is at its maximum, the drive nut (11) is in the second limit position; when it is necessary to change the wing chord length, the drive motor (7) drives the drive gear to rotate forward or reverse according to the deformation requirements, and the lead screw (8) rotates under the action of the torsional torque, so that the drive nut moves along the wing chord length direction; Rod No. 1 hinged to the drive nut ab of a The point moves along the wing chord direction and passes through pole number 1. ab pole number 2 bc and pole number 3 bd Coordinated motion, linkage system c Point and d When the point distance changes, the distance between the front spar and the rear spar of the wing changes; After the wing rear spars reach the predetermined position, the drive motor stops, and the drive nut self-locks to fix the position.

6. A drive device for a variable chord wing according to claim 1, characterized in that, The nested shear plate (5) is used to improve the torsional resistance of the wing section. The nested shear plate (5) includes a fixed plate (20) and a sliding plate (21). The nested shear plate (5) is installed between the front spar (1) and the rear spar (2) of the wing. The upper and lower edges of the fixed plate (20) are folded into a groove shape so that the sliding plate (21) can slide in it. One end of the fixed plate (20) and the sliding plate (21) are bent into a right angle and a connecting hole is opened. They are fixed to the web of the front and rear spars with bolts. The nested shear plate (5) has a large shear stiffness. When the wing section is subjected to a torsional moment, the fixed plate (20) and the sliding plate (21) restrain each other to improve the torsional resistance.

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