A drive device for generating wing twist

Abstract

This invention discloses a drive device for generating wing torsion, belonging to the field of variator aircraft structural technology. The invention drives the portion of the wing's front and rear spars, excluding a spanwise occupant, to deflect upwards or downwards, thereby causing active clockwise or counterclockwise torsional deformation in that portion of the wing. A hinge point is set at a spanwise occupant of the driven wing spars, dividing the wing spars into a fixed section and a movable section. The webs of the two sections are hinged by single and double lugs. The upper and lower flanges on the left and right sides of the webs are connected by four drive screws, with the thread direction of the upper flange drive screws opposite to that of the lower flange drive screws. Therefore, when the drive screws of the upper and lower flanges operate, they generate axial forces in opposite directions. These opposing axial forces form a couple that drives the movable section of the wing spars to deflect around the hinge point. The upward and downward deflection of the two wing spars around the hinge point causes the movable section of the wing to twist.

Description

Technical Field

[0001] This invention belongs to the field of variator aircraft structure technology, specifically relating to a drive device for generating wing twist. Background Technology

[0002] Variant aircraft can actively change their shape during flight, thereby achieving optimal aerodynamic performance and flight efficiency in various flight environments. Most research on variant aircraft focuses on improving lift, reducing drag, or increasing the lift-to-drag ratio, such as changing the chord length or span (changing wing area), altering the sweep angle, or changing the leading and trailing edge camber. However, the wing's angle of attack has a significant impact on the aircraft's aerodynamic characteristics. Changing the leading edge twist angle distribution can improve pressure distribution on the wing, reduce wing root loads, and thus increase structural lifespan. Adjusting the wing's twist shape can improve roll control efficiency and static aeroelastic characteristics. Furthermore, active wing twist combined with varying leading and trailing edge camber can produce even more shape changes.

[0003] Currently, there are few solutions for changing the torsional shape of an airfoil. This invention studies a driving device, which is set in a certain position along the span of the airfoil. By driving the front and rear spars of the airfoil to deflect upward or downward respectively, the airfoil produces active torsional deformation. Summary of the Invention

[0004] This invention addresses a scheme for active wing torsional deformation, providing a simple and reliable driving method. By deflecting the front and rear spars outside a certain spanwise position of the wing upward or downward, this part of the wing undergoes active clockwise or counterclockwise torsional deformation.

[0005] The invention is implemented as follows: A hinge point is set at a spanwise location on the driven wing spars, dividing the wing spars into a fixed section and a movable section. The webs of the two sections are hinged by single and double lugs. The upper and lower flanges on the left and right sides of the webs are connected by four drive screws, and the thread direction of the upper flange drive screw is opposite to that of the lower flange drive screw. Therefore, when the motor is working, the driving torque of the motor will be transmitted to the drive screws through each stage of drive. The operation of the drive screws of the upper and lower flanges generates axial forces in opposite directions. These axial forces in opposite directions form a couple that causes the movable section of the wing spars to deflect around the hinge point. The upward and downward deflection of the two wing spars around the hinge point will cause the movable section of the wing to twist.

[0006] Specifically, the drive device deflects the portion of the wing's front and rear spars, excluding a certain spanwise occupancy, upwards or downwards, thereby causing active clockwise or counterclockwise torsional deformation in that portion of the wing. A hinge point is provided at a certain spanwise occupancy of the driven wing spars, dividing the wing spars into a fixed section and a movable section. The wing torsion drive device includes a threaded transmission part and a transmission drive part. The threaded transmission part includes: a nut, a support block, a drive screw, and a stop block. The transmission drive part includes: a motor, a primary drive, a secondary drive, a tertiary drive, a support plate, and primary, secondary, and tertiary drives. The moving section has a corresponding shaft, input gear, output gear, and shaft support, and a corresponding motor support. The threaded transmission connects the upper and lower flanges on the left and right sides of the web of the fixed section and the moving section and transmits axial force. After being driven, the threaded transmission will generate relative displacement, causing the moving section of the wing beam to deflect around the hinge point. The transmission drive is arranged on the fixed section of the wing beam. The drive shaft supports and motor supports of each stage are mounted on the support plate. The driving torque of the motor is transmitted to the first-stage drive, the first-stage drive then transmits the driving torque to the second-stage drive, the second-stage drive transmits the driving torque to the third-stage drive, and the third-stage drive outputs the driving torque to the threaded transmission.

[0007] Furthermore, the webs of the front and rear wing spars are hinged by single and double lugs, and the upper and lower flanges on the left and right sides of the webs are connected by four drive screws respectively. The thread direction of the upper flange drive screw is opposite to that of the lower flange drive screw. Therefore, when the drive screws of the upper and lower flanges work, they will generate axial forces in opposite directions. These axial forces in opposite directions will form a couple that causes the movable section of the wing spars to deflect around the hinge point. The upward and downward deflection of the two wing spars around the hinge point will cause the movable section of the wing to twist.

[0008] Furthermore, the drive screw is divided into 6 parts: the first part is a threaded end that fits with the nut; the second part is a round smooth rod; the third part is a round boss; the fourth part is a round smooth rod; the fifth part is a drive gear used to receive the driving torque; and the sixth part is a smooth end that extends into the round recess of the stop block.

[0009] Furthermore, the nut is a quadrangular prism, with one bottom surface welded to the upper and lower flanges on both sides of the web of the movable section of the wing beam, and one side welded to the web. The nut mates with the threaded portion of the drive screw, and the threads of the nuts on the upper and lower flanges are opposite in direction. When each drive screw is subjected to a driving torque, it will generate axial forces in opposite directions in the threaded pair of the upper and lower flanges. These opposite axial forces form a couple that drives the movable section of the beam to deflect around the hinge point. The support block is a quadrangular prism, with one bottom surface welded to the upper and lower flanges on both sides of the web of the movable section of the wing beam, and one side welded to the web. A circular through hole is opened in the middle. The drive screw passes through the circular through hole, and the boss on the drive screw contacts the side of the support block. When the drive screw rotates, it prevents the drive screw from generating axial displacement.

[0010] The stop block is a quadrangular prism, with one bottom surface welded to the upper and lower edge strips on the left and right sides of the web of the movable section of the wing beam, and one side welded to the web. A circular recess is opened in the middle so that one end of the drive screw can be inserted, which prevents the drive screw from axial displacement and radial oscillation.

[0011] Furthermore, the shaft, gear, and shaft support corresponding to the first-level drive are respectively: first-level transmission shaft, first-level transmission gear, and first-level shaft support; the shaft, gear, and shaft support corresponding to the second-level drive are respectively: second-level transmission shaft, second-level input gear, second-level output gear, and second-level shaft support; the shaft, gear, and shaft support corresponding to the third-level drive are respectively: third-level transmission shaft, third-level input gear, third-level output gear, and third-level shaft support.

[0012] Furthermore, the primary drive is located on one side of the web of the fixed beam section. The primary drive shaft is connected to the motor and receives the output torque and speed of the motor. The primary drive gear meshes with the secondary input gear of the secondary drive. Therefore, the speed of the primary drive shaft and the primary drive gear is the same as the output speed of the motor. The driving torque of the motor is transmitted to the primary drive gear through the primary drive shaft, and the primary drive gear then transmits the driving torque to the secondary input gear.

[0013] Furthermore, the secondary drive distributes the motor torque to the tertiary drives on both sides of the web and synchronizes them. Therefore, it is set in the central plane where the web of the beam is located. The secondary input gear meshes with the primary transmission gear of the primary drive, and the secondary output gear meshes with the tertiary input gears of the tertiary drives on the left and right sides of the web. Therefore, the secondary transmission shaft, the secondary input gear, and the secondary output gear rotate at the same speed, and this speed is less than the speed of the primary transmission shaft. The driving torque transmitted from the primary drive is transmitted from the secondary input gear to the secondary output gear via the secondary transmission shaft, and then from the secondary output gear to the two tertiary input gears of the tertiary drive.

[0014] Furthermore, the three-stage drive system transmits the driving torque simultaneously to the four upper and lower driving screws on both sides of the web. Therefore, the three-stage drive system is symmetrically arranged on the left and right sides of the web, and two three-stage transmission shafts are respectively installed in the three-stage shaft supports on the left and right sides of the web. The two three-stage input gears mesh with the two-stage output gears of the two-stage drive system at the same time. Each three-stage output gear meshes with the gears on the upper and lower driving screws on one side of the web. Therefore, the two three-stage transmission shafts, the two three-stage input gears, and the two three-stage output gears rotate at the same speed, and this speed is less than the speed of the two-stage transmission shaft. The driving torque transmitted from the two-stage drive system is transmitted from the three-stage input gears to the three-stage output gears through the three-stage transmission shafts, and the three-stage output gears then transmit the driving torque to the driving screws.

[0015] Furthermore, the support plate is a flat wall panel, i.e., a reinforcing plate, on which motor supports, primary shaft supports, secondary shaft supports, and tertiary shaft supports are welded. The secondary drive is arranged in the central plane of the web. Two reinforcing plates are symmetrically installed on the web of the fixed section of the wing beam with screws. Holes are made in the web and support plate to provide installation space for the shaft and gear of the secondary drive. The height of the shaft hole is greater than the diameter of the shaft, and the length of the shaft hole is equal to the length of the shaft. A hole with a width greater than the width of the gear and a height greater than the diameter of the gear is left at the location of the gear to accommodate the bushing for installing the secondary drive shaft. The bushing is a circular cylindrical body. To ensure smooth contact between the secondary shaft support and the secondary drive shaft, the diameter of the secondary shaft support hole can be set to be greater than the diameter of the secondary drive shaft. The secondary drive shaft and the bushing are then installed together in the shaft support, so that the bushing fills the gap between the secondary shaft support hole and the secondary drive shaft to compensate for the diameter.

[0016] Furthermore, the primary shaft support is welded to one side of the support plate; the secondary shaft support is symmetrically welded to the support plates on the left and right sides of the web, and the interior of the secondary shaft support forms a circle with the web and the support plate, the diameter of which is larger than the diameter of the secondary drive shaft, so that the bushing is installed inside; when installing the secondary drive, the support plate on one side can be installed on the web with screws and the support on that side can be welded first, then the bushing on the secondary drive can be placed in the corresponding position, and then the support plate on the other side can be installed with screws and the shaft support on the other side can be welded; the tertiary shaft support is also symmetrically welded to the support plates on the left and right sides of the web.

[0017] The advantages of this invention compared to the prior art are as follows:

[0018] The drive device of this invention has the advantages of simple structure, high transmission efficiency, good synchronization, and convenient installation. This invention provides a simple and reliable drive scheme that causes the front and rear spars outside a certain spanwise section of the wing to deflect upwards or downwards, resulting in active clockwise or counterclockwise torsional deformation of that part of the wing. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the deflection of the front and rear beams of a drive device for generating wing torsion according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of a drive device for generating wing twist according to the present invention;

[0021] Figure 3 This is a schematic diagram of the threaded transmission part of a drive device for generating wing torsion according to the present invention;

[0022] Figure 4 This is a schematic diagram of the first stage drive of a drive device for generating wing twist according to the present invention;

[0023] Figure 5 This is a schematic diagram of a two-stage drive for a drive device used to generate wing twist according to the present invention;

[0024] Figure 6 This is a schematic diagram of a three-stage drive system for generating wing twist according to the present invention.

[0025] Figure 7 This is a schematic diagram of a support plate for a drive device for generating wing twist according to the present invention;

[0026] Among them, 1-fixed section, 2-moving section, 3-threaded transmission part, 4-third-stage drive, 5-support plate, 6-second-stage drive, 7-first-stage drive, 8-nut, 9-support block, 10-drive screw, 11-drive gear, 12-stop block, 13-first-stage shaft support, 14-motor support, 15-first-stage transmission gear, 16-first-stage transmission shaft, 17-motor, 18-second-stage input gear, 19-second-stage transmission shaft, 20-second-stage shaft support, 21-second-stage output gear, 22-bushing, 23-third-stage input gear, 24-third-stage transmission shaft, 25-third-stage shaft support, 26-third-stage output gear, 27-sleeve, 28-drive screw central axis, 29-reinforcing plate. Detailed Implementation

[0027] 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.

[0028] The wing torsion drive device of the present invention drives a portion of the wing's front and rear spars, excluding a spanwise occupied area, to deflect upwards or downwards, thereby causing active clockwise or counterclockwise torsional deformation in that portion of the wing. Figure 1As shown. A hinge point is set at a spanwise location on the driven wing spars, dividing the wing spars into a fixed segment 1 and a movable segment 2. The webs of the two segments are hinged by single and double lugs. The upper and lower flanges on the left and right sides of the webs are connected by four drive screws 10, and the thread direction of the upper flange drive screw 10 is opposite to that of the lower flange drive screw 10. Therefore, when the upper and lower flange drive screws 10 are working, they will generate axial forces in opposite directions. These axial forces in opposite directions form a couple that causes the movable segment 2 of the wing spars to deflect around the hinge point. The upward and downward deflection of the two wing spars around the hinge point will cause the movable segment 2 of the wing to twist.

[0029] The wing torsion drive device of the present invention mainly includes a threaded transmission part 3 and a transmission drive part; wherein the threaded transmission part 3 includes: a nut 8, a support block, a stop block 12, and a drive screw 10; the transmission drive part includes: a motor 17, a primary drive 7, a secondary drive 6, a tertiary drive 4, and a support plate 5. The threaded transmission part 3 connects the upper and lower flanges on the left and right sides of the web of the fixed section 1 and the movable section 2 and transmits axial force. After being driven, the threaded transmission part 3 will generate relative displacement, causing the movable section 2 of the wing spar to deflect around the hinge point; the transmission drive part is arranged on the fixed section 1 of the wing spar. Each stage of the drive has a corresponding shaft, input gear, output gear, and shaft support. Each stage of the shaft support and the motor support 14 are mounted on the support plate 5. The driving torque of the motor 17 is transmitted to the primary drive 7, the primary drive 7 then transmits the driving torque to the secondary drive 6, the secondary drive 6 transmits the driving torque to the tertiary drive 4, and the tertiary drive 4 outputs the driving torque to the threaded transmission part 3, such as Figure 2 As shown (2(a) is the front view of the drive device, 2(b) is the cross-sectional view of the drive device AA, 2(c) is the cross-sectional view of the drive device BB, 2(d) is the cross-sectional view of the drive device CC, and 2(e) is the cross-sectional view of the drive device DD).

[0030] Sleeve 27 is a circular cylindrical body, installed on the drive shaft between the input and output gears of each stage of the drive, providing axial positioning for the input and output gears. The inner diameter of sleeve 27 is equal to the diameter of the drive shaft, and the outer diameter of sleeve is slightly larger than the diameter of the drive shaft. The length of sleeve is equal to the distance between the input and output gears. (If other positioning methods are available, the sleeve may not be used for positioning).

[0031] The nut 8 is a quadrangular prism. One of its bottom surfaces is welded to the upper and lower flanges on the left and right sides of the web of the movable section 2 of the wing beam, and the other side is welded to the web. The nut 8 is engaged with the threaded part of the drive screw 10, and the threads of the nut 8 on the upper and lower flanges are opposite in direction. When each drive screw 10 is subjected to the driving torque, it will generate axial forces in opposite directions in the threaded pair of the upper and lower flanges. These opposite axial forces form a couple that drives the movable section 2 of the beam to deflect around the hinge point.

[0032] The support block 9 is a quadrangular prism. One of its bottom surfaces is welded to the upper and lower edge strips on both sides of the web of the movable section 2 of the wing beam, and one side is welded to the web. A circular through hole is opened in the middle. The drive screw 10 passes through the circular through hole, and the boss on the drive screw 10 contacts the side of the support block. When the drive screw 10 rotates, it prevents the drive screw 10 from axially displacing. Figure 3 As shown.

[0033] The stop block 12 is a quadrangular prism. One of its bottom surfaces is welded to the upper and lower edge strips on both sides of the web of the movable section 2 of the wing beam, and one side is welded to the web. A circular recess is opened in the middle so that one end of the drive screw 10 can extend into it, which prevents the drive screw 10 from axial displacement and radial oscillation. Figure 3 As shown.

[0034] The shape of the drive screw 10 is as follows Figure 3 As shown, it is divided into 6 parts. The first part is the threaded end that fits with the nut 8. The second part is the round smooth rod. The third part is the round boss. The fourth part is the round smooth rod. The fifth part is the drive gear 11, which is used to receive the driving torque. The sixth part is the smooth end that extends into the round recess of the stop block.

[0035] The drive gear 11 is located between the smooth end of the drive screw 10 and the circular guide rod. The diameter of the drive gear is larger than that of the drive screw, and the diameter of the drive gear must be such that it does not interfere with the upper and lower edge strips and web of the spar. The diameter of the drive gear is not much different from that of the drive screw, so the drive gear 10 and the drive screw 11 are made as a single unit, and the drive gear is considered as part of the drive screw. The central axis 28 of the drive screw is the straight line on which the central axis of the drive screw 10 lies.

[0036] The first-level drive 7 structure is as follows Figure 4 As shown (4(a) is the front view of the first-stage drive, 4(b) is the top view of the first-stage drive). The first-stage drive 7 is located on one side of the web of the fixed section 1 beam. The first-stage drive shaft 16 is connected to the motor 17 and receives the output torque and speed of the motor 17. The first-stage drive gear 15 meshes with the second-stage input gear 18 of the second-stage drive 6. Therefore, the speed of the first-stage drive shaft 16 and the first-stage drive gear 15 is the same as the output speed of the motor 17. The driving torque of the motor 17 is transmitted to the first-stage drive gear 15 through the first-stage drive shaft 16, and the first-stage drive gear 15 then transmits the driving torque to the second-stage input gear 18.

[0037] Two-stage drive 6-structure as follows Figure 5As shown (5(a) is the front view of the secondary drive, 5(b) is the top view of the secondary drive). The secondary drive 6 distributes the torque of the motor 17 to the tertiary drive 4 on both sides of the web and synchronizes them. Therefore, it is set in the center plane where the web of the beam is located. The secondary input gear 18 meshes with the primary transmission gear 15 of the primary drive 7, and the secondary output gear 21 meshes with the tertiary input gears 23 of the tertiary drive 4 on the left and right sides of the web. Therefore, the secondary transmission shaft 19, the secondary input gear 18 and the secondary output gear 21 have the same speed, and this speed is less than the speed of the primary transmission shaft 16. The driving torque transmitted from the primary drive 7 is transmitted from the secondary input gear 18 to the secondary output gear 21 through the secondary transmission shaft 19, and then from the secondary output gear 21 to the two tertiary input gears 23 of the tertiary drive 4.

[0038] Three-stage drive 4-structure, such as Figure 6 As shown (6(a) is the front view of the three-stage drive, 6(b) is the top view of the three-stage drive). The three-stage drive 4 transmits the driving torque to the four upper and lower drive screws 10 on both sides of the web plate simultaneously. Therefore, the three-stage drive 4 is symmetrically arranged on the left and right sides of the web plate. The two three-stage transmission shafts 24 are respectively installed in the three-stage shaft supports 25 on the left and right sides of the web plate. The two three-stage input gears 23 mesh with the two-stage output gears 21 of the two-stage drive 6 at the same time. Each three-stage output gear 26 meshes with the gears on the upper and lower drive screws 10 on one side of the web plate. Therefore, the two three-stage transmission shafts 24, the two three-stage input gears 23 and the two three-stage output gears 26 rotate at the same speed, and this speed is less than the speed of the two-stage transmission shaft 19. The driving torque transmitted from the two-stage drive 6 is transmitted from the three-stage input gears 23 to the three-stage output gears 26 through the three-stage transmission shafts 24. The three-stage output gears 26 then transmit the driving torque to the drive screws 10.

[0039] The support plate 5 is a flat wall panel, namely the reinforcing plate 29. A motor support 14, a primary shaft support 13, a secondary shaft support 20, and a tertiary shaft support 25 are welded onto the reinforcing plate 29. Figure 7 As shown, since the secondary drive 6 is arranged on the central plane of the web, two reinforcing plates 29 are symmetrically installed on the web of the fixed section 1 of the wing beam with screws. Holes must be made in the web and support plate 5 to provide installation space for the shaft and gear of the secondary drive 6. The height of the shaft hole must be greater than the diameter of the shaft, and the length of the shaft hole must be equal to the shaft length. A hole with a width greater than the width of the gear and a height greater than the diameter of the gear is left at the location of the gear to accommodate the bushing 22 for installing the secondary drive shaft 19. The bushing 22 is a circular cylindrical body. To ensure smooth contact between the secondary shaft support and the secondary drive shaft, the diameter of the secondary shaft support hole can be set to be greater than the diameter of the secondary drive shaft. Then, the secondary drive shaft and the bushing 22 are installed together in the shaft support, so that the bushing 22 fills the gap between the shaft support hole and the shaft, compensating for the diameter difference.

[0040] The cross-sectional shape and installation position of the primary shaft support 13 or the motor support 14 are as follows: Figure 7 As shown in Figure 7(a), a schematic diagram of the support plate and its supports; Figure 7(b), a diagram of the support plate; Figure 7(c), a cross-sectional view of the secondary shaft support (AA); Figure 7(d), a cross-sectional view of the tertiary shaft support (BB); and Figure 7(e), a cross-sectional view of the motor support or the primary shaft support (CC),), it is welded to one side of the support plate 5. The cross-sectional shape and installation position of the secondary shaft support 20 are as follows. Figure 7 As shown, the support plates 5 are symmetrically welded to the left and right sides of the web. The inside of the shaft support forms a circle with the web and support plates 5. The diameter of this circle is larger than the diameter of the secondary drive shaft 19, allowing the bushing 22 to be installed inside. When installing the secondary drive 6, first install one side of the support plate 5 with screws onto the web and weld the support on that side. Then, put the bushing 22 on the secondary drive 6 and place it in the corresponding position. Finally, install the other side of the support plate 5 with screws and weld the shaft support on the other side. The cross-sectional shape and installation position of the tertiary shaft support 25 are as follows... Figure 7 As shown, the support plates 5 are symmetrically welded to the left and right sides of the web.

[0041] The present invention discloses the working principle of a drive device for generating wing twist:

[0042] A hinge point is set at a spanwise location on the fore and aft spars of the wing, dividing the fore and aft spars into a fixed section 1 and a movable section 2. The webs of the two sections are hinged by a single and double lug. The upper and lower flanges on the left and right sides of the web are connected by four drive screws 10, and the thread direction of the upper flange drive screw 10 is opposite to that of the lower flange drive screw 10. Therefore, when the drive screws 10 of the upper and lower flanges are subjected to driving torque, they will generate axial forces in opposite directions in the threaded pair. These opposite axial forces form a couple that drives the movable section 2 of the spar to deflect around the hinge point. The upward and downward deflection of the two spars around the hinge point will cause the movable section 2 of the wing to undergo torsional deformation. In order to ensure that each drive screw 10 is subjected to the same driving torque simultaneously... The driving torque synchronizes the driving of each drive screw 10 to the beam. Therefore, a transmission drive section is set up to transmit the driving torque to the drive screw 10. The motor 17 outputs the driving torque to the first-stage transmission shaft 16. This driving torque is transmitted to the second-stage transmission shaft 19 through the meshing of the first-stage gear and the second-stage input gear 18. The driving torque on the second-stage transmission shaft is then transmitted to the two third-stage transmission shafts 24 through the meshing of the second-stage output gear 21 and the two third-stage input gears 23. The two third-stage transmission shafts 24 output the driving torque to the drive screw 10 through the meshing of the third-stage output gear 26 with the gears on the two drive screws 10. Thus, the four drive screws 10 are synchronously subjected to the same driving torque.

[0043] The specific embodiments of the present invention will be further described in detail below through data examples.

[0044] A twin-spar straight wing was selected for torsion drive, achieving a torsion angle of 20° at the wingtip. The dimensions of the drive unit's placement on the front and rear spars were designed. Assuming the wing's spanwise length from wingtip to root is 4100mm, and the airfoil chord length is 1400mm, with the front spar positioned at 30% of the chord length and the rear spar at 65%. The front spar bears 70% of the bending moment load, and the rear spar bears 30%. A hinge point is placed 2100mm spanwise from the wing root, allowing torsion deformation of the wing section 2000mm beyond the hinge point. The front and rear spars are I-beams with a 5mm thick flange, 3mm thick web, 80mm wide flange, and 120mm high web at the 2100mm spanwise section.

[0045] To achieve a 20° torsion angle for active wingtip deformation, the front and rear spars need to have a deflection angle of 3°. Assuming the maximum bending moment at the wing hinge point is 15000 N·m, the front spar bears a bending moment of 10500 N·m, and the rear spar bears a bending moment of 4500 N·m. Here, we assume the threaded drive components are made of alloy material with a strength of approximately 500 MPa. We select threads with a helix angle of 2.5° and an equivalent friction angle of 7° for the front and rear spar threaded pairs. Based on strength theory, we choose a 12mm diameter, trapezoidal thread profile, 3mm pitch, 1.5mm thread height, and 30mm thread section length for the front and rear spar drive screws. The spacing between the break points of the flanges is 40mm, meaning the distance between the nut and the support block is 40mm. A 20mm diameter drive screw boss with a thickness of 10mm is located 60mm from the thread section on the drive screw, and a straight... The drive screw gear has a diameter of 22mm, a tooth thickness of 15mm, and 22 teeth. The length of the rear guide rod of the gear is 15mm, and the total length of the drive screw is 130mm. The stop block, support block, and nut are all cuboids of 20×28×39mm. The 20mm direction is the direction of the drive screw axis, the 28mm direction is the direction of the web height, and the 39mm direction is the direction of the flange width. One side of the 20×39mm part is welded to the flange, and the other side of the 20×28mm part is welded to the web. On the 39×28mm part, with a point 12mm away from the two edges away from the web and flange as the center, the nuts of the lower flange of the front beam and the upper flange of the rear beam have clockwise threaded holes, while the upper flange of the front beam and the lower flange of the rear beam have counterclockwise threaded holes. The stop block has a circular recess with a diameter of 12mm and a depth of 5mm, and the support block has a circular through hole with a diameter of 12.3mm.

[0046] The transmission drive component is made of a material with a strength of 500 MPa. The support plate is made of 3mm thick metal plate with a maximum height of 100mm and a maximum length of 180mm, and is mounted on the web plate with screws. The first-stage transmission gear of the front and rear beams has a diameter of 15mm and a thickness of 15mm. The first-stage transmission shaft has a diameter of 9mm and a length of 70mm. The distance between the center axis of the first-stage shaft support and the center plane of the web plate is 55mm and the thickness is 10mm. The second-stage input gear has a diameter of 45mm and a thickness of 10mm. The second-stage output gear has a diameter of 20mm and a thickness of 15mm. The second-stage transmission shaft has a diameter of 12mm and a length of 80mm. The second-stage shaft support is 10mm wide, and the inner circle formed by the second-stage shaft support has a diameter of 18mm. The bushing is a ring with an outer diameter of 18mm and an inner diameter of 12mm, installed inside the second-stage shaft support. The third-stage input gear has a diameter of 80mm and a thickness of 10mm. The first-stage output gear has a diameter of 76mm and a thickness of 10mm. The third-stage drive shaft has a diameter of 20mm and a length of 80mm. The distance between the center axis of the corresponding third-stage shaft support and the center plane of the web is 70mm and the thickness is 10mm. The torque on the first-stage drive shaft of the front beam is 14.3N•m, so a stepper motor capable of outputting at least 14.3N•m is selected. The torque on the first-stage drive shaft of the rear beam is 6.1N•m, so a stepper motor capable of outputting at least 6.1N•m is selected. The distance between the center axis of the motor support and the center plane of the web is 55mm and the thickness is 10mm. There is a 90mm long and 18mm wide hole at the center line of the web and the support plate to provide installation space for the second-stage drive shaft. There are holes with a height of 17mm and a height of 22mm and 47mm respectively at the locations of the second-stage output and input gears.

[0047] When installing the threaded drive section, first weld the nut to the movable section of the beam, and the support block to the fixed section of the beam. Connect the fixed end and the web of the movable section through the hinge point, install the drive screw, connect the beam edge strip, and finally weld the stop block to the corresponding position. When installing the transmission drive section, first weld the secondary shaft support and the tertiary shaft support to the support plates on both sides, and weld the primary shaft support to the support plate on one side. Install the support plate on one side with screws onto the web. Then assemble the secondary drive (including the secondary drive shaft, secondary input gear, and secondary output gear) and install it at the position on the plane of the web. Install the support plate on the other side with screws. Place the tertiary input gear, tertiary output gear, and sleeve in their positions, then pass the tertiary drive shaft through and axially position it to complete the installation of the tertiary drive. Install the primary drive on the primary shaft support, assemble the motor and motor support together, then connect the motor and primary drive shaft with a coupling. Finally, weld the motor support to the support plate in its position. Upon receiving the drive command, the front beam motor outputs a drive torque greater than 14.3 N•m, and the rear beam motor outputs a drive torque greater than 6.1 N•m. The drive screws of the upper edge of the front beam and the lower edge of the rear beam move in the direction of unscrewing the nut, while the drive screws of the lower edge of the front beam and the upper edge of the rear beam move in the direction of screwing the nut in. The front beam deflects downward by 3°, and the rear beam deflects upward by 3°, causing the wingtip to twist by 20°, thus reducing the angle of attack by 20°.

[0048] 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 generating wing twist, characterized in that, The drive device drives the portion of the wing's front and rear spars outside a certain spanwise position to deflect upwards or downwards, thereby causing the portion of the wing to undergo active clockwise or counterclockwise torsional deformation; a hinge point is set at a certain spanwise position of the driven wing spars to divide the wing spars into a fixed section (1) and a movable section (2). The wing twist drive device includes a threaded transmission part (3) and a transmission drive part; The threaded transmission part (3) includes: nut (8), support block (9), drive screw (10), and stop block (12); The transmission drive section includes: a motor (17), a first-stage drive (7), a second-stage drive (6), a third-stage drive (4), a support plate (5), and shafts, input gears, output gears and shaft supports corresponding to the first-stage drive (7), the second-stage drive (6) and the third-stage drive (4), and a motor support (14) corresponding to the motor (17). The threaded transmission part (3) connects the upper and lower flanges on the left and right sides of the web of the fixed section (1) and the movable section (2) and transmits axial force. After being driven, the threaded transmission part (3) will generate relative displacement, causing the movable section of the wing beam to deflect around the hinge point. The transmission drive section is arranged in the fixed section (1) of the wing beam. Each level of drive shaft support and motor support (14) are mounted on the support plate (5). The driving torque of the motor (17) is transmitted to the first-level drive (7), the first-level drive (7) then transmits the driving torque to the second-level drive (6), the second-level drive (6) transmits the driving torque to the third-level drive (4), and the third-level drive (4) outputs the driving torque to the threaded transmission part (3).

2. The drive device for generating wing twist according to claim 1, characterized in that, The webs of the front and rear wing spars are hinged by single and double lugs. The upper and lower flanges on the left and right sides of the webs are connected by four drive screws (10). The thread direction of the upper flange drive screw is opposite to that of the lower flange drive screw. Therefore, when the upper and lower flange drive screws work, they will generate axial forces in opposite directions. These axial forces in opposite directions will form a couple that will cause the movable section of the wing spars to deflect around the hinge point. The upward and downward deflection of the two wing spars around the hinge point will cause the movable section of the wing to twist.

3. The drive device for generating wing twist according to claim 1, characterized in that, The drive screw (10) is divided into 6 parts. The first part is a threaded end that is adapted to the nut (8). The second part is a circular smooth rod. The third part is a circular boss. The fourth part is a circular smooth rod. The fifth part is a drive gear (11) to receive the driving torque. The sixth part is a smooth end that extends into the circular recess of the stop block.

4. A drive device for generating wing twist according to claim 3, characterized in that, The nut (8) is a quadrangular prism. One of its bottom surfaces is welded to the upper and lower flanges on the left and right sides of the web of the movable section of the wing beam, and one side is welded to the web. The nut (8) is engaged with the threaded part of the drive screw (10), and the threads of the nuts (8) on the upper and lower flanges are opposite in direction. When each drive screw (10) is subjected to the driving torque, it will generate axial forces in opposite directions in the threaded pair of the upper and lower flanges. These opposite axial forces will form a couple to drive the movable section of the beam to deflect around the hinge point. The support block (9) is a quadrangular prism. One of its bottom surfaces is welded to the upper and lower edge strips on the left and right sides of the web of the movable section of the wing beam, and one side is welded to the web. A circular through hole is opened in the middle. The drive screw (10) passes through the circular through hole. The boss on the drive screw (10) contacts the side of the support block (9). When the drive screw (10) rotates, it prevents the drive screw (10) from generating axial displacement. The stop block (12) is a quadrangular prism. One of its bottom surfaces is welded to the upper and lower edge strips on the left and right sides of the web of the movable section of the wing beam, and one side is welded to the web. A circular recess is opened in the middle so that one end of the drive screw (10) can be inserted, which prevents the drive screw (10) from axial displacement and also prevents the drive screw (10) from radial oscillation.

5. A drive device for generating wing twist according to claim 1, characterized in that, The shaft, gear and shaft support corresponding to the first-stage drive (7) are respectively: first-stage drive shaft (16), first-stage drive gear (15), and first-stage shaft support (13). The shaft, gear and shaft support corresponding to the secondary drive (6) are respectively: secondary drive shaft (19), secondary input gear (18), secondary output gear (21), and secondary shaft support (20). The shaft, gear and shaft support corresponding to the three-stage drive (4) are respectively: three-stage transmission shaft (24), three-stage input gear (23), three-stage output gear (26), and three-stage shaft support (25).

6. A drive device for generating wing twist according to claim 5, characterized in that, The first-stage drive (7) is located on one side of the web of the fixed section beam. The first-stage drive shaft (16) is connected to the motor (17) and receives the output torque and speed of the motor (17). The first-stage drive gear (15) meshes with the second-stage input gear (18) of the second-stage drive (6). Therefore, the speed of the first-stage drive shaft (16) and the first-stage drive gear (15) is the same as the output speed of the motor (17). The driving torque of the motor (17) is transmitted to the first-stage drive gear (15) through the first-stage drive shaft (16), and the first-stage drive gear (15) then transmits the driving torque to the second-stage input gear (18).

7. A drive device for generating wing twist according to claim 5, characterized in that, The secondary drive (6) is to distribute the torque of the motor (17) to the secondary drive (4) on both sides of the web and synchronize them. Therefore, it is set in the center plane where the web of the beam is located. The secondary input gear (18) meshes with the primary transmission gear (15) of the primary drive, and the secondary output gear (21) meshes with the secondary input gear (23) of the secondary drive on both sides of the web. Therefore, the secondary transmission shaft (19), the secondary input gear (18) and the secondary output gear (21) have the same speed, and this speed is less than the speed of the primary transmission shaft (16). The driving torque transmitted from the primary drive (7) is transmitted from the secondary input gear (18) to the secondary output gear (21) through the secondary transmission shaft (19), and then from the secondary output gear (21) to the two secondary input gears (23) of the secondary drive (4).

8. A drive device for generating wing twist according to claim 5, characterized in that, The three-stage drive (4) transmits the driving torque to the four upper and lower drive screws on both sides of the web plate simultaneously. Therefore, the three-stage drive (4) is symmetrically arranged on the left and right sides of the web plate. Two three-stage transmission shafts (24) are installed in the three-stage shaft supports (25) on the left and right sides of the web plate respectively. Two three-stage input gears (23) mesh with the two-stage output gears (21) of the two-stage drive at the same time. Each three-stage output gear (26) meshes with the gears on the upper and lower drive screws on one side of the web plate respectively. Therefore, the two three-stage transmission shafts (24), the two three-stage input gears (23) and the two three-stage output gears (26) have the same speed, and this speed is less than the speed of the two-stage transmission shaft (19). The driving torque transmitted from the two-stage drive is transmitted from the three-stage input gear (23) to the three-stage output gear (26) through the three-stage transmission shaft (24). The three-stage output gear (26) then transmits the driving torque to the drive screw (10).

9. A drive device for generating wing twist according to claim 5, characterized in that, The support plate (5) is a flat wall plate, namely a reinforcing plate (29). The reinforcing plate (29) is welded with a motor support (14), a first-stage shaft support (13), a second-stage shaft support (20) and a third-stage shaft support (25). The second-stage drive (6) is arranged on the central plane of the web plate. The two reinforcing plates (29) are symmetrically installed on the web plate of the fixed section of the wing beam by screws. The web plate and the support plate should be opened to leave installation space for the shaft and gear of the second-stage drive. The height of the shaft hole should be greater than the diameter of the shaft and the length of the shaft hole should be equal to the length of the shaft. A hole with a width greater than the width of the gear and a height greater than the diameter of the gear should be left at the position of the gear to match the bushing (22) to install the second-stage drive shaft (19). The bushing (22) is a circular cylindrical body, installed in the secondary shaft support. Its inner diameter is equal to the diameter of the secondary drive shaft, its outer diameter is equal to the inner diameter of the secondary shaft support hole, and its length is equal to the length of the secondary shaft support hole, ensuring smooth contact between the secondary shaft support and the secondary drive shaft. The diameter of the secondary shaft support hole can be set to be larger than the diameter of the secondary drive shaft. Then, the secondary drive shaft and the bushing are installed together in the secondary shaft support, so that the bushing fills the gap between the secondary shaft support hole and the secondary drive shaft, compensating for the diameter.

10. A drive device for generating wing twist according to claim 9, characterized in that, The first-stage shaft support (13) is welded to one side of the support plate (5); the second-stage shaft support (20) is symmetrically welded to the support plates (5) on the left and right sides of the web. The interior of the second-stage shaft support (20) forms a circle with the web and the support plate. The diameter of the circle is larger than the diameter of the second-stage drive shaft (19), so that the bushing (22) is installed inside. When installing the second-stage drive (6), the support plate on one side can be installed on the web with screws and the support on that side can be welded. Then the bushing (22) on the second-stage drive (6) can be placed in the corresponding position. Then the support plate on the other side can be installed with screws and the shaft support on the other side can be welded. The third-stage shaft support (25) is also symmetrically welded to the support plates on the left and right sides of the web.

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