Retractable model airplane undercarriage

Abstract

The utility model discloses a retractable model airplane undercarriage, which relates to the technical field of undercarriages and comprises a base, a hinge seat is arranged on one side of the base, a driving cylinder is hinged to the base, a travel opening is formed in the base, two mounting vertical plates are parallelly arranged on the other side of the base, and a guide groove is formed in the base and positioned between the two mounting vertical plates. A rack is arranged in the guide groove, and one side of the rack is connected with the output end of the driving cylinder; the rack is meshed with a gear, a first mounting plate is arranged on the two mounting vertical plates, a first rotating frame is rotationally arranged on the first mounting plate, and one end of the first rotating frame is connected with the gear; a rotating arm is hinged to the first rotating frame, second mounting plates are arranged on the portions, located on the two sides of the driving cylinder, of the base, and the second mounting plates are rotationally connected with the rotating arm; a supporting arm is mounted on the rotating arm; a rotating wheel is arranged at one end of the supporting arm; the folding and unfolding of the supporting arm and the rotating wheel are realized through the matching of the driving cylinder, the gear and the rack, the flight resistance is reduced, and the normal flight is ensured.

Description

Technical Field

[0001] This utility model relates to the field of landing gear technology, and in particular to a retractable model aircraft landing gear. Background Technology

[0002] Landing gear is the device used by an aircraft to support its weight and bear corresponding loads when it is parked, taxiing, taking off, or landing on the ground.

[0003] Aviation models are a general term for various aircraft models. They include model airplanes and other model aircraft. Aviation model activities have aroused great interest from the very beginning and have remained popular for thousands of years. This is mainly because they play a vital role in the development of the aviation industry and the cultivation of scientific and technological talent. With my country's increasing emphasis on the development of its aviation industry in recent years, aviation models, which are closely related to the development of aviation, have received more and more attention and development, and more and more aviation models with different shapes and structures have appeared on the market. However, looking at these aviation models, their landing gear structures are mostly fixed and non-movable. As the requirements for the flight performance and speed of model airplanes increase, the impact of fixed landing gear on the aerodynamic performance of model airplanes also increases.

[0004] Currently, most model airplanes do not have retractable landing gear. During flight, the landing gear of most airplanes remains extended, which has a certain impact on the flight, aesthetics, and handling of the airplane. The landing gear determines whether the takeoff and landing process is smooth or not. However, most landing gear is exposed to the outside after takeoff, which causes the airplane to experience greater drag during flight, thus affecting normal flight.

[0005] Therefore, there is an urgent need for a retractable model aircraft landing gear that can be flexibly extended and retracted during flight and landing to reduce drag and ensure normal flight. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model provides a retractable landing gear for model aircraft, which solves the problem that the landing gear of most existing model aircraft is non-retractable. During flight, the landing gear of most aircraft remains extended, which has a certain impact on the flight, aesthetics, and handling of the aircraft. The landing gear determines the smoothness of the takeoff and landing process. Most landing gear is exposed to the outside after takeoff, causing the aircraft to experience greater drag during flight, thus affecting normal flight.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0008] A retractable model aircraft landing gear includes a base, a hinge seat on one side of the base, a drive cylinder hinged to the base via the hinge seat, a stroke opening on the base along the direction of the output end of the drive cylinder, two mounting plates parallel to the length of the drive cylinder on the other side of the base, a guide groove on the base between the two mounting plates, a rack slidingly disposed in the guide groove, and one side of the rack connected to the output end of the drive cylinder via the stroke opening;

[0009] The rack is meshed with a gear, and the two mounting plates are provided with a first mounting plate. The first mounting plate is provided with a first rotating hole, and a first rotating frame is rotatably mounted in the first rotating hole. One end of the first rotating frame is connected to the gear.

[0010] A rotating arm is hinged to the first rotating frame, and a second mounting plate is symmetrically provided on both sides of the base located on the drive cylinder. The second mounting plate is rotatably connected to the rotating arm.

[0011] The rotating arm has an installation port, and a support arm can be detachably installed in the installation port. One end of the support arm is provided with a wheel.

[0012] Furthermore, a second rotating hole is provided on the second mounting plate, and a bearing is provided in the second rotating hole. A rotating column is fitted in the inner ring of the bearing, and the rotating column is connected to the rotating arm.

[0013] Furthermore, the rotating arms are symmetrically arranged on both sides of the drive cylinder, and the angle between the rotating arms and the drive cylinder is an acute angle.

[0014] Furthermore, the angle between the drive cylinder and the rotating arm is 45 degrees.

[0015] Furthermore, the support arm has an arched structure.

[0016] Furthermore, one end of the support arm passes through the mounting port and is provided with an abutment portion, and the base is provided with a limiting plate at the position of the abutment portion.

[0017] Furthermore, the base is generally cross-shaped and has a driving part and connecting parts symmetrically arranged on both sides of the driving part, and the second mounting plate is disposed on the connecting parts.

[0018] In summary, the beneficial technical effects of this utility model are as follows:

[0019] The drive cylinder controls the output end to extend and retract along the stroke opening. The output end drives the rack to slide along the guide groove. The rack further links with the gear, which drives the rotating arm to rotate through the first rotating frame. The rotation of the rotating arm drives the support arm and the rotating wheel to open and close. Then, when the aircraft takes off, the support arm and the rotating wheel are retracted to reduce drag during flight. When the aircraft lands, the output end of the drive cylinder retracts to open the support arm and the rotating wheel to provide support. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 yes Figure 1 A diagram from another angle;

[0022] Figure 3 yes Figure 1 A diagram of the third angle;

[0023] Figure 4 This is a diagram showing the support arm when it is folded up;

[0024] Figure 5 This is a schematic diagram of another state when the support arm is folded up.

[0025] Reference numerals: 1. Base; 2. Hinge seat; 3. Drive cylinder; 4. Stroke port; 5. Mounting plate; 6. Guide groove; 7. Rack; 8. Gear; 9. First mounting plate; 10. First rotating frame; 11. Rotating arm; 12. Second rotating frame; 13. Mounting port; 14. Support arm; 15. Rotating wheel; 16. Second mounting plate; 17. Bearing; 18. Rotating column; 19. Abutment part; 20. Limiting plate; 21. Drive part; 22. Connecting part. Detailed Implementation

[0026] The present invention will now be described clearly and completely with reference to the embodiments.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] In the description of the embodiments, unless otherwise expressly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] See appendix Figures 1-5 The image shows a retractable model aircraft landing gear, including a base 1, which is cross-shaped and includes a horizontally arranged drive unit 21 and symmetrically arranged connecting parts 22 on both sides of the drive unit 21. One end of the drive unit 21 is provided with a hinge seat 2, and a drive cylinder 3 is hinged to the hinge seat 2 along the length direction of the drive unit 21. The drive cylinder 3 can be a pneumatic cylinder, hydraulic cylinder, or electric cylinder. The drive unit 21 has a stroke port 4 along the length direction at the output end of the drive cylinder 3. On the other side of the base 1, two mounting plates 5 are arranged parallel to each other along the length direction on the drive unit 21, and a guide groove 6 is provided between the two mounting plates 5. A rack 7 is slidably arranged in the guide groove 6. One side of the rack 7 is connected to the output end of the drive cylinder 3 through the stroke port 4. The rack 7 slides along the rack 7 under the action of the drive cylinder 3.

[0030] Furthermore, each of the two mounting plates 5 is provided with a first mounting plate 9, and a first rotating hole is provided on the first mounting plate 9. A gear 8 is rotatably provided between the two first mounting plates 9 through the first rotating hole. The gear 8 meshes with the rack 7. A first rotating frame 10 is provided at each end of the gear 8. A second rotating frame 12 is hinged on the first rotating frame 10. A rotating arm 11 is provided at one end of the second rotating frame 12. The included angle between the drive cylinder 3 and the rotating arm 11 is 45 degrees. A rotating column 18 is provided at the end of the rotating arm 11 away from the second rotating frame 12.

[0031] Furthermore, the connecting part 22 is provided with a second mounting plate 16 at the position of the rotating column 18. The second mounting plate 16 has a second rotating hole and a bearing 17 is provided in the second rotating hole. The outer circle of the bearing 17 is connected to the second mounting plate 16 and the inner circle of the bearing 17 is connected to the rotating column 18. In use, the drive cylinder 3 drives the rack 7 to slide along the guide groove 6. The rack 7 further drives the rotating arm 11 to rotate along the bearing 17 through the gear 8.

[0032] Furthermore, the rotating arm 11 has an installation port 13, and a support arm 14 is detachably installed in the installation port 13. The support arm 14 has an arched structure and is fixed to the rotating arm 11 by rivets. One end of the support arm 14 is provided with a wheel 15. During operation, the drive cylinder 3 drives the rack 7 to slide along the guide groove 6. The rack 7 further drives the rotating arm 11 to rotate along the bearing 17 through the gear 8. At this time, the rotating arm 11 drives the entire support arm 14 and the wheel 15 to open and close. When the aircraft takes off, the support arm 14 and the wheel are retracted, thereby reducing the drag during flight and ensuring normal flight. At the same time, it also improves the overall aesthetics of the aircraft. When landing, the support arm 14 is opened, and the wheel supports the weight of the entire aircraft.

[0033] Furthermore, one end of the support arm 14 passes through the mounting port 13 and is provided with an abutment portion 19. The base 1 is provided with a limiting plate 20 at the position of the abutment portion 19. When the support arm 14 is opened, the abutment portion 19 abuts against the limiting plate 20 to achieve the maximum opening angle. At the same time, the cooperation between the limiting plate 20 and the abutment portion 19 prevents the support arm 14 from being opened too much, which could cause twisting to the rotating arm 11.

[0034] The beneficial effects of this utility model are that when the support arm 14 is opened, the output end is extended by the drive cylinder 3, and the output end drives the rack 7 to slide forward along the guide groove 6. At this time, the rack 7 further drives the rotating arm 11 to rotate along the bearing 17 through the gear 8. The rotating arm 11 drives the entire support arm 14 and the wheel 15 to retract, reducing the drag during flight, ensuring normal flight, and also improving the overall aesthetics of the aircraft. When landing, the drive cylinder 3 controls the output end to retract, and the output end drives the rack 7 to slide in the opposite direction and realize the rotation of the rotating arm 11 to open the support arm 14. The rotation provides support for the weight of the entire aircraft.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape and principle of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A retractable landing gear for model airplanes, characterized in that: Includes a base (1), a hinge seat (2) is provided on one side of the base (1), a drive cylinder (3) is hinged to the base (1) through the hinge seat (2), a stroke port (4) is provided on the base (1) along the direction of the output end of the drive cylinder (3), two mounting plates (5) are provided parallel to the length direction of the drive cylinder (3) on the other side of the base (1), a guide groove (6) is provided between the two mounting plates (5) on the base (1), a rack (7) is slidably provided in the guide groove (6), and one side of the rack (7) is connected to the output end of the drive cylinder (3) through the stroke port (4); The rack (7) is meshed with a gear (8), and the two mounting plates (5) are provided with a first mounting plate (9). The first mounting plate (9) is provided with a first rotating hole, and a first rotating frame (10) is rotatably provided in the first rotating hole. One end of the first rotating frame (10) is connected to the gear (8). A rotating arm (11) is hinged on the first rotating frame (10), and a second mounting plate (16) is symmetrically provided on both sides of the base (1) of the drive cylinder (3). The second mounting plate (16) is rotatably connected to the rotating arm (11). The rotating arm (11) has an installation port (13), and a support arm (14) is detachably installed in the installation port (13). One end of the support arm (14) is provided with a wheel (15).

2. The retractable landing gear for model aircraft according to claim 1, characterized in that: The second mounting plate (16) has a second rotating hole, and a bearing (17) is provided in the second rotating hole. A rotating column (18) is fitted in the inner ring of the bearing (17), and the rotating column (18) is connected to the rotating arm (11).

3. The retractable landing gear for model aircraft according to claim 1, characterized in that: The rotating arm (11) is symmetrically arranged on both sides of the drive cylinder (3), and the angle between the rotating arm (11) and the drive cylinder (3) is an acute angle.

4. The retractable landing gear for model aircraft according to claim 1, characterized in that: The angle between the drive cylinder (3) and the rotating arm (11) is 45 degrees.

5. The retractable landing gear for model aircraft according to claim 1, characterized in that: The support arm (14) has an arched structure.

6. The retractable landing gear for model aircraft according to claim 1, characterized in that: One end of the support arm (14) passes through the mounting port (13) and is provided with an abutment part (19). The base (1) is provided with a limiting plate (20) at the position of the abutment part (19).

7. The retractable landing gear for model aircraft according to claim 1, characterized in that: The base (1) is cross-shaped and has a drive part (21) and a connecting part (22) symmetrically arranged on both sides of the drive part (21). The second mounting plate (16) is arranged on the connecting part (22).

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