Landing gear retraction structure

Abstract

The present application discloses a landing gear retraction structure, which relates to the field of landing gear technology. The present application includes a belly, a storage bin is provided inside the belly, a wheel is hinged inside the storage bin, and a drive slide is symmetrically provided on the inner side of the storage bin, and a drive slider is slidably connected inside the drive slide. The present application sets a driving slider for use in conjunction with a transmission assembly and a driven assembly, so that starting the driving assembly can drive the driving slider to move along the length direction of the driving slide, and the follower rack drives the driven rod to move along the length direction of the driven slide, thereby driving the cover plate to move in a direction parallel to the storage slot, and at the same time, the driving slider drives the transmission assembly to drive the wheel to rotate around the hinge axis, so that the cover plate can be retracted into the storage slot while one end of the wheel is pushed out of the storage bin and in contact with the ground, effectively simplifying the driving process of the wheel and the cover plate and saving the space occupied by the driving mechanism.

Description

Technical Field

[0001] The present application relates to the technical field of landing gear, and in particular to a landing gear retraction and extension structure. Background Art

[0002] Landing gear is an accessory device used to support an aircraft during takeoff, landing, or taxiing, and to facilitate ground movement. As aircraft speeds increase, retractable landing gear is being designed to reduce air resistance during flight. While retractable landing gear increases aircraft weight and complicates structural design compared to fixed landing gear, it improves flight efficiency and is a common feature on modern aircraft.

[0003] The landing gear of a general aircraft will also operate synchronously with the door retraction mechanism, so that the door opens during landing and the landing gear extends out of the aircraft through the door. During flight, the landing gear is retracted into the fuselage and the door closes at the same time.

[0004] In order to ensure smooth operation, general door retraction and extension mechanisms and landing gear retraction and extension mechanisms mostly use high-precision signal sensors and controllers to control the start and stop of the door retraction and extension mechanisms and landing gear retraction and extension mechanisms. This design method requires the door retraction and extension mechanisms and landing gear retraction and extension mechanisms to be installed inside the fuselage through separate drive components, which increases the occupied space inside the fuselage. Summary of the Invention

[0005] The purpose of the present application is to provide a landing gear retraction structure to solve the problem that the existing design method requires the door retraction mechanism and the landing gear retraction mechanism to be installed separately inside the fuselage, which increases the occupied space inside the fuselage.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0007] The top of the cover plate is inclined with a driven slide, one end of the driven rod is slidably connected to the inside of the driven slide, and the inner top of the follower bin is provided with a driven assembly for driving the follower rack to move.

[0008] By adopting the above technical solution, by setting the driving slider to be used in conjunction with the transmission assembly and the driven assembly, the starting driving assembly can drive the driving slider to move along the length direction of the driving slide groove, and the driving slider cooperates with the driven assembly and the follower rack to drive the driven rod to move along the length direction of the driven slide groove, thereby driving the cover plate to move in a direction parallel to the storage groove, and at the same time, the driving slider drives the transmission assembly to drive the wheel to rotate around the hinge axis, so as to facilitate the drive cover plate to retract into the storage groove while making one end of the wheel push out of the interior of the storage bin and contact the ground, effectively simplifying the driving process of the wheel and the cover plate and saving the space occupied by the driving mechanism.

[0009] Furthermore, the transmission assembly includes a transmission rack fixedly connected to the bottom of the driving slider, the hinged end between the wheel and the belly is fixedly connected with a transmission gear, and the transmission rack is meshed with the transmission gear.

[0010] By adopting the above technical solution, by setting up the coordinated use of the transmission rack and the transmission gear, when the starting drive assembly drives the driving slider to move along the length direction of the driving slide groove, the transmission gear can be driven to rotate, thereby causing the transmission gear to drive the machine wheel to rotate around the hinge shaft.

[0011] Furthermore, the driving assembly includes a threaded rod rotatably connected to the inside of the storage bin, one end of the threaded rod is threadedly connected to the driving slider, the other end of the threaded rod is fixedly connected to bevel gear 1, the inner top of the storage bin is rotatably connected to bevel gear 2 meshing with bevel gear 1, the top of the belly is fixedly connected to a driving motor, and the output end of the driving motor is fixedly connected to bevel gear 2.

[0012] By adopting the above technical solution, by setting up the coordinated use of bevel gear one and bevel gear two, the starting drive motor drives bevel gear one to engage with bevel gear two, and drives the threaded rod to rotate, so that the threaded rod and the drive slider form a threaded connection, so that the threaded rod pushes the drive slider to move along the length direction of the drive slide.

[0013] Furthermore, the driven assembly includes a driven rack fixedly connected to the top of the follower bin, and one side of the driving slider is rotatably connected to a driven gear engaged with the driven rack, and the driven gear is engaged with the follower rack.

[0014] By adopting the above technical solution and setting up the coordinated use of the driven rack and the driven gear, when the starting drive assembly drives the driving slider to move along the length direction of the driving slide groove, the driving slider drives the driven gear to engage with the driven rack and the follower rack respectively, and at the same time, the driven gear pushes the follower rack to move along the length direction of the follower bin, so as to facilitate driving the follower rack to drive the driven rod to move along the length direction of the follower bin.

[0015] Furthermore, the bottom end of the driven rod is rotatably connected to a roller, and the roller is installed inside the driven slide groove.

[0016] By adopting the above technical solution and arranging the coordinated use of the roller and the driven rod, the smoothness of the sliding of the driven rod in the driven slide groove is effectively improved, thereby improving the practicality of the device.

[0017] Furthermore, a support assembly is installed at one end of the wheel, and the support assembly includes a first support rod hinged to the middle section of the wheel, a second support rod is hinged to the inner top of the storage bin, the second support rod is hinged to the first support rod, a slot is provided at one end of the first support rod, an insertion rod is installed at one end of the second support rod, and an ejection assembly is installed at one end of the second support rod.

[0018] By adopting the above technical solution, by setting up the coordinated use of the insertion rod and the slot, when the rotating wheel pulls the first support rod and the second support rod to expand in parallel, the ejection assembly is activated to drive the insertion rod into the interior of the slot, so that the first support rod cooperates with the second support rod to form a fixed diagonal brace on one side of the wheel, thereby effectively improving the supporting strength of the wheel.

[0019] Furthermore, the ejection assembly includes an electric push rod fixedly connected to one side of the second support rod, an ejection slot is opened on one side of the second support rod, an ejection slider is slidably connected inside the ejection slot, one end of the ejection slider is fixedly connected to the output end of the electric push rod, and the other end of the ejection slider is fixedly connected to the insertion rod.

[0020] By adopting the above technical solution, by setting the ejection chute and the ejection slider for use together, when the first support rod and the second support rod are extended in parallel, starting the electric push rod can drive the insertion rod to be inserted into the interior of the slot along the length direction of the ejection chute.

[0021] Furthermore, a gathering groove adapted to the first support rod is provided on one side of the second support rod.

[0022] By adopting the above technical solution, the folding groove is provided to facilitate the storage of one side of the first support rod, effectively reducing the space occupied by the first support rod and the second support rod after folding, and improving the practicality of the device.

[0023] In summary, this application has at least one of the following beneficial effects:

[0024] 1. By setting up the coordinated use of the driving slider, the transmission assembly and the driven assembly, starting the driving assembly can drive the driving slider to move along the length direction of the driving slide, and the follower rack drives the driven rod to move along the length direction of the driven slide, thereby driving the cover plate to move in a direction parallel to the storage slot, and at the same time, the driving slider drives the transmission assembly to drive the wheel to rotate around the hinge shaft, so as to facilitate the drive cover plate to retract into the storage slot while making one end of the wheel push out of the interior of the storage bin and contact the ground, effectively simplifying the driving process of the wheel and the cover plate and saving the space occupied by the driving mechanism.

[0025] 2. By setting up the coordinated use of the transmission rack and the transmission gear, when the starting drive assembly drives the driving slider to move along the length direction of the driving slide, the transmission gear can be driven to rotate, thereby causing the transmission gear to drive the wheel to rotate around the hinge shaft.

[0026] 3. By setting up the coordinated use of bevel gear 1 and bevel gear 2, the starting drive motor drives bevel gear 1 to engage with bevel gear 2, and drives the threaded rod to rotate, so that the threaded rod and the drive slider form a threaded connection, so that the threaded rod pushes the drive slider to move along the length direction of the drive slide.

[0027] 4. By setting up the coordinated use of the driven rack and the driven gear, when the starting drive assembly drives the driving slider to move along the length direction of the driving slide, the driving slider drives the driven gear to engage with the driven rack and the follower rack respectively, and at the same time, the driven gear pushes the follower rack to move along the length direction of the follower bin, so as to facilitate driving the follower rack to drive the driven rod to move along the length direction of the follower bin. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the device body in this application.

[0029] Figure 2 It is a schematic diagram of the internal structure of the storage bin in this application.

[0030] Figure 3 This is an exploded view of the internal structure of the storage bin in this application.

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the roller in this application.

[0032] Figure 5 It is an exploded view of the three-dimensional structure of the support assembly in this application.

[0033] Description of reference numerals:

[0034] 1. Belly; 2. Storage compartment; 3. Wheel; 4. Drive chute; 5. Drive slider; 6. Transmission assembly; 7. Drive assembly; 8. Follower compartment; 9. Follower rack; 10. Storage slot; 11. Cover plate; 12. Follower through slot; 13. Follower rod; 14. Follower chute; 15. Follower assembly; 16. Roller; 17. Support assembly; 18. Gathering slot; 61. Drive rack; 62. Drive gear; 71. Threaded rod; 72. Bevel gear 1; 73. Bevel gear 2; 74. Drive motor; 151. Follower rack; 152. Follower gear; 171. First support rod; 172. Second support rod; 173. Slot; 174. Insert rod; 175. Ejector assembly; 1751. Electric push rod; 1752. Ejector chute; 1753. Ejector slider. DETAILED DESCRIPTION

[0035] The present application is further described in detail below with reference to the accompanying drawings.

[0036] An embodiment of the present application discloses a landing gear retraction and extension structure.

[0037] Reference Figure 1-Figure 3A landing gear retraction structure includes a belly 1, a storage compartment 2 is provided inside the belly 1, a wheel 3 is hinged inside the storage compartment 2, and a driving chute 4 is symmetrically provided on the inner side of the storage compartment 2. A driving slider 5 is slidably connected to the driving chute 4. A transmission component 6 for driving the wheel 3 to rotate is installed at the bottom of the driving slider 5. A driving component 7 for driving the driving slider 5 to move is installed at the top of the storage compartment 2. A follower compartment 8 connected to the driving chute 4 is provided inside the belly 1. The inner bottom is slidably connected to a follower rack 9, a storage groove 10 is symmetrically provided on the inner side of the storage bin 2, and a cover plate 11 is slidably connected to the inside of the storage groove 10. A follower through groove 12 communicating with the storage groove 10 is provided at the inner bottom of the follower bin 8, one end of the follower rack 9 is fixedly connected to a driven rod 13, and a driven slide 14 is obliquely provided on the top of the cover plate 11, one end of the driven rod 13 is slidably connected to the inside of the driven slide 14, and a driven component 15 for driving the follower rack 9 to move is installed on the inner top of the follower bin 8.

[0038] When in use, first, the driving assembly 7 is started in the positive direction to drive the driving slide 5 to move along the length direction of the driving slide groove 4, and the driving slide 5 drives the transmission assembly 6 to drive the wheel 3 to rotate around the hinge axis to the bottom of the storage bin 2, and at the same time, the driving slide 5 drives the driven assembly 15 to drive the follower rack 9 to move along the length direction of the follower bin 8, and the follower rack 9 drives the driven rod 13 to move along the length direction of the driven slide groove 14, so that the driven rod 13 pushes the cover plate 11 to retract into the storage groove 10 through the driven slide groove 14, so that the follower rack 9 drives the cover plate 11 to retract into the storage groove 10, and at the same time, one end of the wheel 3 is pushed out of the storage bin 2 and contacts the ground;

[0039] Similarly, by reverse starting the driving component 7, the driving slider 5 is driven to cooperate with the transmission component 6 to drive the wheel 3 to rotate around the hinge axis toward the inside of the storage bin 2, and at the same time, the driving slider 5 drives the driven component 15 to cooperate with the follower rack 9 to drive the driven rod 13 to move along the inside of the driven slide groove 14, and push the cover plate 11 out of the inside of the storage groove 10, and then make the two cover plates 11 conflict with each other in the direction parallel to the storage groove 10, so that the wheel 3 is retracted into the inside of the storage bin 2 and the two cover plates 11 form a cover for the bottom of the storage bin 2, so that it is convenient to drive the wheel 3 and the cover plate 11 to move synchronously through a driving component 7, effectively simplifying the driving process of the wheel 3 and the cover plate 11, and saving the space occupied by the driving mechanism.

[0040] Reference Figure 2 and Figure 3 The transmission assembly 6 includes a transmission rack 61 fixedly connected to the bottom of the driving slider 5, and a transmission gear 62 is fixedly connected to the hinged end of the wheel 3 and the belly 1, and the transmission rack 61 is engaged with the transmission gear 62.

[0041] During use, when the driving component 7 is started to drive the driving slider 5 to move along the length direction of the driving slide 4, the driving slider 5 drives the transmission rack 61 to engage with the transmission gear 62, and drives the transmission gear 62 to drive the machine wheel 3 to rotate around the hinge axis, so as to facilitate the driving wheel 3 to rotate around the hinge axis into the internal storage of the storage bin 2, or to rotate out of the interior of the storage bin 2 to form a conflict with the ground.

[0042] Reference Figure 2 and Figure 3 The driving assembly 7 includes a threaded rod 71 rotatably connected to the inside of the storage bin 2, one end of the threaded rod 71 is threadedly connected to the driving slider 5, and the other end of the threaded rod 71 is fixedly connected to a bevel gear 1 72. The inner top of the storage bin 2 is rotatably connected to a bevel gear 2 73 meshing with the bevel gear 1 72, and the top of the belly 1 is fixedly connected to a driving motor 74, and the output end of the driving motor 74 is fixedly connected to the bevel gear 2 73.

[0043] When in use, the driving motor 74 is started to drive the bevel gear 2 73 to rotate, and the bevel gear 2 73 is meshed with the bevel gear 1 72. At the same time, the bevel gear 1 72 is driven to drive the threaded rod 71 to rotate, so that the threaded rod 71 and the driving slider 5 form a threaded connection, so that the threaded rod 71 drives the driving slider 5 to move along the length direction of the driving slide 4, so that the driving slider 5 cooperates with the transmission assembly 6 to drive the wheel 3 to rotate around the hinge axis into the interior of the storage bin 2 for storage;

[0044] Similarly, by reverse starting the drive motor 74, bevel gear 2 73 is driven to engage with bevel gear 1 72, and bevel gear 1 72 drives the threaded rod 71 to rotate in the opposite direction, so that the threaded rod 71 drives the drive slider 5 to pull back along the length direction of the drive slide 4, so that the drive slider 5 cooperates with the transmission assembly 6 to drive the wheel 3 to rotate out of the storage bin 2 around the hinge axis, thereby driving the drive slider 5 to move along the length direction of the drive slide 4.

[0045] Reference Figure 2 and Figure 3 The driven assembly 15 includes a driven rack 151 fixedly connected to the top of the follower bin 8, and one side of the driving slider 5 is rotatably connected to a driven gear 152 engaged with the driven rack 151, and the driven gear 152 is engaged with the follower rack 9.

[0046] During use, when the driving component 7 is started to drive the driving slider 5 to move along the length direction of the driving slide 4, the driving slider 5 drives the driven gear 152 to move along the guide direction of the driven rack 151, and at the same time the driven gear 152 is engaged with the follower rack 9, and the driven gear 152 drives the follower rack 9 to move along the length direction of the follower bin 8, and at the same time the follower rack 9 drives the driven rod 13 to move along the guide direction of the driven slide 14, and the driven rod 13 pushes the driven slide 14 to move along the direction parallel to the receiving groove 10, so as to facilitate the movement of the drive cover 11 to eject or retract the inside of the receiving groove 10.

[0047] Reference Figure 3 and Figure 4 The bottom end of the driven rod 13 is rotatably connected to a roller 16 , which is installed inside the driven slide 14 .

[0048] During use, when the follower rack 9 drives the driven rod 13 to move along the guiding direction of the driven slide 14, the driven rod 13 drives the roller 16 to roll along the inner wall of the driven slide 14, thereby effectively reducing the friction between the driven rod 13 and the driven slide 14 and improving the smoothness of the device.

[0049] Reference Figure 2 and Figure 5 A support assembly 17 is installed at one end of the wheel 3, and the support assembly 17 includes a first support rod 171 hinged at the middle section of the wheel 3. A second support rod 172 is hinged at the inner top of the storage bin 2. The second support rod 172 is hinged to the first support rod 171. A slot 173 is provided at one end of the first support rod 171, an insertion rod 174 is installed at one end of the second support rod 172, and an ejection assembly 175 is installed at one end of the second support rod 172.

[0050] During use, when the driving assembly 7 is started to drive the wheel 3 to rotate around the hinge axis toward the bottom of the storage compartment 2, the wheel 3 drives the first support rod 171 to rotate around the hinge axis, and the first support rod 171 pulls the second support rod 172 to unfold. When the first support rod 171 and the second support rod 172 are unfolded to be parallel, the ejection assembly 175 is started to drive one end of the insertion rod 174 to be inserted into the interior of the slot 173, so that the first support rod 171 cooperates with the second support rod 172 to form a fixed diagonal brace on one side of the wheel 3, thereby forming a stable triangular support structure between the wheel 3 and the belly 1, the first support rod 171, and the second support rod 172, thereby effectively improving the supporting strength of the wheel 3.

[0051] Reference Figure 2 and Figure 5The ejection assembly 175 includes an electric push rod 1751 fixedly connected to one side of the second support rod 172, and an ejection slot 1752 is opened on one side of the second support rod 172. The ejection slot 1752 is internally slidably connected to an ejection slider 1753. One end of the ejection slider 1753 is fixedly connected to the output end of the electric push rod 1751, and the other end of the ejection slider 1753 is fixedly connected to the insertion rod 174.

[0052] When in use, the rotating wheel 3 pulls the first support rod 171 and the second support rod 172 to expand parallel to each other, so that the insertion rod 174 is aligned with the slot 173, and then the electric push rod 1751 is started to drive the ejection slider 1753 to move along the length direction of the ejection slide 1752, and the ejection slider 1753 drives the insertion rod 174 along the length direction of the ejection slide 1752 to be inserted into the interior of the slot 173, thereby facilitating driving the insertion rod 174 to be inserted into the interior of the slot 173.

[0053] Reference Figure 2 and Figure 5 A gathering groove 18 adapted to the first support rod 171 is opened on one side of the second support rod 172.

[0054] During use, when the rotating wheel 3 pulls the first support rod 171 and the second support rod 172 to fold around the hinge axis, a part of the first support rod 171 rotates around the hinge axis with the second support rod 172 and is inserted into the inside of the folding groove 18, thereby effectively reducing the space occupied by the first support rod 171 and the second support rod 172 when folded, thereby improving the practicality of the device.

[0055] The implementation principle of the landing gear retraction and extension structure of this embodiment is as follows: first, the driving motor 74 is started in the reverse direction to drive the bevel gear 2 73 to engage with the bevel gear 1 72, and the bevel gear 1 72 drives the threaded rod 71 to rotate in the reverse direction, so that the threaded rod 71 drives the driving slider 5 to move back along the length direction of the driving chute 4;

[0056] At the same time, the driving slider 5 drives the transmission rack 61 to engage with the transmission gear 62, and drives the transmission gear 62 to drive the machine wheel 3 to rotate around the hinge axis, so that the machine wheel 3 is driven to rotate around the hinge axis out of the interior of the storage bin 2 and come into contact with the ground;

[0057] At the same time, the driving slider 5 drives the driven gear 152 to move along the guide direction of the driven rack 151, so that the driven gear 152 is meshed with the follower rack 9, and the driven gear 152 drives the follower rack 9 to move along the length direction of the follower bin 8, and at the same time, the follower rack 9 drives the driven rod 13 to move along the guide direction of the driven slide 14, and the driven rod 13 pushes the driven slide 14 to move in a direction parallel to the receiving groove 10, so that the follower rack 9 drives the cover plate 11 to retract into the receiving groove 10, and at the same time, one end of the wheel 3 is pushed out of the interior of the receiving bin 2 and contacts the ground;

[0058] Similarly, by starting the drive motor 74 in the forward direction, the threaded rod 71 can be driven to drive the drive slider 5 to move outward along the length direction of the drive slide 4, so that the drive slider 5 drives the transmission rack 61 to engage with the transmission gear 62, and drives the drive wheel 3 to rotate around the hinge shaft out of the storage bin 2 and come into contact with the ground;

[0059] At the same time, the driving slider 5 cooperates with the driven gear 152 and the driven rack 151 to drive the follower rack 9 to move along the length direction of the follower bin 8, so that the driven rod 13 pushes the driven slide 14 to move in a direction parallel to the storage groove 10, so that the follower rack 9 drives the cover plate 11 to push out of the storage groove 10, and at the same time, one end of the wheel 3 is retracted into the storage bin 2.

Claims

1. A landing gear retraction structure, comprising a belly (1), characterized in that: The interior of the belly (1) is provided with a storage bin (2), the interior of the storage bin (2) is hinged with a wheel (3), and the inner side of the storage bin (2) is symmetrically provided with a driving chute (4), the interior of the driving chute (4) is slidably connected with a driving slider (5), the bottom of the driving slider (5) is provided with a transmission component (6) for driving the wheel (3) to rotate, the inner top of the storage bin (2) is provided with a driving component (7) for driving the driving slider (5) to move, the interior of the belly (1) is provided with a follower bin (8) connected to the driving chute (4), the inner bottom of the follower bin (8) is slidably connected to the driving slider (5), and the bottom of the follower bin (8) is provided with a transmission component (6) for driving the wheel (3) to rotate, and the inner top of the storage bin (2) is provided with a driving component (7) for driving the driving slider (5) to move. A follower rack (9) is connected, a receiving groove (10) is symmetrically provided on the inner side of the receiving bin (2), a cover plate (11) is slidably connected to the inside of the receiving groove (10), a follower through groove (12) is provided on the inner bottom of the follower bin (8) and is communicated with the receiving groove (10), one end of the follower rack (9) is fixedly connected to a driven rod (13), a driven slide (14) is obliquely provided on the top of the cover plate (11), one end of the driven rod (13) is slidably connected to the inside of the driven slide (14), and a driven component (15) for driving the follower rack (9) to move is installed on the inner top of the follower bin (8); The transmission assembly (6) includes a transmission rack (61) fixedly connected to the bottom of the driving slider (5), and a transmission gear (62) is fixedly connected to the hinged end of the wheel (3) and the belly (1), and the transmission rack (61) is meshed with the transmission gear (62); The driven assembly (15) includes a driven rack (151) fixedly connected to the top of the follower bin (8), and one side of the driving slider (5) is rotatably connected to a driven gear (152) meshing with the driven rack (151), and the driven gear (152) meshes with the follower rack (9).

2. The landing gear retracting and extending structure according to claim 1, characterized in that: The driving assembly (7) includes a threaded rod (71) rotatably connected to the interior of the storage bin (2), one end of the threaded rod (71) is threadedly connected to the driving slider (5), the other end of the threaded rod (71) is fixedly connected to a bevel gear 1 (72), the inner top of the storage bin (2) is rotatably connected to a bevel gear 2 (73) meshing with the bevel gear 1 (72), the top of the belly (1) is fixedly connected to a driving motor (74), and the output end of the driving motor (74) is fixedly connected to the bevel gear 2 (73).

3. The landing gear retracting and extending structure according to claim 1, characterized in that: The bottom end of the driven rod (13) is rotatably connected to a roller (16), and the roller (16) is installed inside the driven slide groove (14).

4. The landing gear retracting and extending structure according to claim 1, characterized in that: A support assembly (17) is installed at one end of the wheel (3), and the support assembly (17) includes a first support rod (171) hinged to the middle section of the wheel (3); a second support rod (172) is hinged to the inner top of the storage bin (2), and the second support rod (172) is hinged to the first support rod (171); a slot (173) is provided at one end of the first support rod (171), an insertion rod (174) is installed at one end of the second support rod (172), and an ejection assembly (175) is installed at one end of the second support rod (172).

5. The landing gear retracting and extending structure according to claim 4, characterized in that: The ejection assembly (175) includes an electric push rod (1751) fixedly connected to one side of the second support rod (172); an ejection chute (1752) is provided on one side of the second support rod (172); an ejection slider (1753) is slidably connected inside the ejection chute (1752); one end of the ejection slider (1753) is fixedly connected to the output end of the electric push rod (1751), and the other end of the ejection slider (1753) is fixedly connected to the insertion rod (174).

6. The landing gear retracting and extending structure according to claim 4, characterized in that: A gathering groove (18) adapted to the first support rod (171) is provided on one side of the second support rod (172).

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