Retractable double-damping undercarriage for small flight model airplane

Abstract

The utility model relates to the technical field of undercarriages of flight models, and discloses a retractable double-damping undercarriage for a small-sized flight model airplane, which comprises a retractable frame, a support frame elastically mounted at one end close to the ground, and bearing blocks symmetrically and elastically mounted on two sides of the support frame, rollers and mounting cylinders for moving the model airplane along the ground are rotatably mounted between the two bearing blocks through rotating shafts, the mounting cylinders are symmetrically mounted on the two sides of the supporting frame, the two mounting cylinders are located over the two bearing blocks, delay pipes are rotatably mounted in inner cavities of the two mounting cylinders, sliding rods are slidably mounted in inner cavities of the delay pipes, and the sliding rods are slidably mounted in the inner cavities of the delay pipes. The top of the delay pipe is fixedly provided with a spring connected with the inner wall of the mounting cylinder, and the end, away from the spring, of the sliding rod is fixedly connected with the outer wall of the bearing block. According to the flying model airplane, the parts are matched with one another, so that vibration generated when the idler wheels collide with the ground can be absorbed, the vibration strength of the flying model airplane and an undercarriage is reduced, and the stability of the flying model airplane is improved.

Description

Technical Field

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

[0002] An aviation model is a model airplane made according to the shape of an aircraft. It belongs to the aerospace model and is a non-manned aircraft for sports. It can realize aerial flight operations. The landing gear is a device for the model airplane to take off, land and park. There are two types: tricycle and tailwheel. Aviation model activities have aroused people's great interest from the beginning and have remained popular for thousands of years.

[0003] Currently, model aircraft landing gear is equipped with rollers. The model aircraft uses these rollers to contact the ground surface, providing support and facilitating takeoff and landing. After takeoff, the rollers need to be retracted to reduce drag and ensure flight stability. During landing, the rollers are lowered to allow for rolling contact between the model aircraft and the ground surface. Common model aircraft roller retraction mechanisms typically extend and retract the rollers vertically. When the model aircraft lands, the contact between the rollers and the ground surface generates a collision and a reaction force. This reaction force acts directly on the landing gear and retraction mechanism vertically, potentially damaging the mechanism. Furthermore, the vibrations from the collision cause vibrations in the landing gear and the entire model aircraft, affecting its stability. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a retractable dual shock-absorbing landing gear for small flying model aircraft, aiming to solve the problems in the prior art.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a retractable dual-shock-absorbing landing gear for small model aircraft, comprising:

[0006] The launch and take-off frame has a support frame elastically installed at one end near the ground. The support frame has load-bearing blocks symmetrically and elastically installed on both sides. Rollers for moving the model aircraft along the ground are rotatably installed between the two load-bearing blocks via a pivot.

[0007] Mounting cylinders are symmetrically installed on both sides of the support frame. The two mounting cylinders are located directly above the two bearing blocks. A delay tube is rotatably installed in the inner cavity of each mounting cylinder. A slide rod is slidably installed in the inner cavity of the delay tube. A spring connected to the inner wall of the mounting cylinder is fixedly installed on the top of the delay tube. The end of the slide rod away from the spring is fixedly connected to the outer wall of the bearing block.

[0008] A spiral groove is formed on the inner wall of the delay tube. A movable block is symmetrically fixed on the outer wall of the slide rod, and the end of the movable block away from the slide rod extends into the inner cavity of the spiral groove.

[0009] The return spring is sleeved on the outside of the slide rod, with one end fixedly connected to the outer wall of the bearing block and the other end fixedly connected to the end of the mounting cylinder near the bearing block.

[0010] As a further description of the above technical solution:

[0011] The support frame is designed as a U-shaped structure, and sliding grooves are symmetrically opened on both sides of the support frame. The end of the rotating shaft away from the roller passes through the sliding groove and is rotatably connected to the outer wall of the bearing block.

[0012] As a further description of the above technical solution:

[0013] The outer wall of the delay tube is fixedly fitted with a transmission bearing, and the outer wall of the transmission bearing is fixedly connected to the inner wall of the mounting cylinder through a connecting block.

[0014] As a further description of the above technical solution:

[0015] The take-up and take-down frame is designed with a U-shaped structure, and a shock absorber is fixedly installed at the end of the take-up and take-down frame closest to the ground. The small end of the shock absorber is fixedly connected to the outer wall of the support frame.

[0016] As a further description of the above technical solution:

[0017] A shock-absorbing spring is fixedly installed at one end of the shock absorber closest to the ground, and the other end of the shock-absorbing spring is fixedly connected to the top of the support frame.

[0018] As a further description of the above technical solution:

[0019] The model aircraft has a fixed support frame inside. Inside the support frame, an adjustment rod is installed by a motor. The end of the launch and take-off frame away from the shock absorber is fixedly connected to the outer wall of the adjustment rod.

[0020] This utility model has the following beneficial effects:

[0021] In this invention, through the cooperation of the sliding rod, the mainspring, and the delay tube, when the roller moves upward under force after impact with the ground, the sliding rod rotates along its own axis. At this time, the mainspring contracts under force, thereby absorbing the impact force generated after the roller hits the ground. After the impact force generated by the ground on the roller disappears, the mainspring slowly extends, thereby allowing the roller to slowly return to its original position. This helps to absorb the vibration generated by the roller hitting the ground, reduce the vibration intensity of the model aircraft and landing gear, and improve the stability of the model aircraft. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present utility model;

[0023] Figure 2 This is a schematic diagram of the main structure of the storage rack of this utility model.

[0024] Figure 3 This is a cross-sectional view of the mounting cylinder of this utility model;

[0025] Figure 4 This is a cross-sectional view of the delay tube of this utility model;

[0026] Figure 5 This utility model Figure 4 Enlarged view of the structure at point A in the middle.

[0027] Legend:

[0028] 1. Bearing frame; 2. Adjusting rod; 3. Retracting frame; 4. Shock absorber; 5. Support frame; 6. Mounting cylinder; 7. Sliding rod; 8. Bearing block; 9. Roller; 10. Spring; 11. Delay tube; 12. Transmission bearing; 13. Moving block. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figure 1-5 One embodiment of this utility model provides: a retractable dual-shock-damping landing gear for small model aircraft, comprising:

[0031] The launch and take-up frame 3 has a support frame 5 elastically installed at one end near the ground. The support frame 5 has load-bearing blocks 8 symmetrically and elastically installed on both sides. A roller 9 for moving the model aircraft along the ground is rotatably installed between the two load-bearing blocks 8 via a pivot. The two load-bearing blocks 8 can support the two ends of the roller 9, thereby ensuring the stability of the roller 9's rotation.

[0032] Mounting cylinders 6 are symmetrically mounted on both sides of the support frame 5. The two mounting cylinders 6 are located directly above the two bearing blocks 8, and a delay tube 11 is rotatably mounted in the inner cavity of each mounting cylinder 6. A slide rod 7 is slidably mounted in the inner cavity of the delay tube 11, and a spring 10 connected to the inner wall of the mounting cylinder 6 is fixedly mounted on the top of the delay tube 11. The outermost end of the spring 10 is fixedly connected to the inner wall of the mounting cylinder 6, and the inner end of the spring 10 is fixedly connected to the outer wall of the delay tube 11. When the delay tube 11 rotates, the inner end of the spring 10 rotates with it. At this time, the spring 10 contracts. When the external force on the delay tube 11 disappears, the spring 10 extends and returns to its original position.

[0033] The end of the slide rod 7 away from the mainspring 10 is fixedly connected to the outer wall of the support block 8. A spiral groove is formed on the inner wall of the delay tube 11. A movable block 13 is symmetrically fixedly installed on the outer wall of the slide rod 7. The end of the movable block 13 away from the slide rod 7 extends into the inner cavity of the spiral groove. When the roller 9 contacts the ground and moves towards the model aircraft, the slide rod 7 moves towards the interior of the delay tube 11 along its own axis. At this time, the movable block 13 moves along the spiral groove and causes the delay tube 11 to rotate. At this time, the mainspring 10 contracts, thereby absorbing the impact force generated after the roller 9 hits the ground. After the impact force generated by the ground on the roller 9 disappears, the mainspring 10 slowly extends, thereby allowing the roller 9 to slowly return to its original position. This helps to absorb the vibration generated by the roller 9 hitting the ground, reduces the vibration intensity of the model aircraft and landing gear, and improves the stability of the model aircraft.

[0034] The return spring is sleeved on the outside of the slide rod 7. One end is fixedly connected to the outer wall of the support block 8, and the other end is fixedly connected to the end of the mounting cylinder 6 near the support block 8. When the slide rod 7 moves upward along its own axis, the return spring is compressed. When the compression force on the return spring is the same as the pressure on the roller 9, the compression process of the return spring stops. Due to the reaction force of the ground on the roller 9, the model aircraft is pushed in the opposite direction, thereby allowing the return spring to return to its original position.

[0035] The support frame 5 is designed as a U-shaped structure, and sliding grooves are symmetrically opened on both sides of the support frame 5. The end of the rotating shaft away from the roller 9 passes through the sliding groove and is rotatably connected to the outer wall of the bearing block 8. The sliding groove can limit the movement trajectory of the roller 9 after being impacted, preventing the roller 9 from shaking and deviating when moving up and down, thus improving the stability of the roller 9 moving up and down.

[0036] A transmission bearing 12 is fixedly sleeved on the outer wall of the delay tube 11. The outer wall of the transmission bearing 12 is fixedly connected to the inner wall of the mounting cylinder 6 through the connecting block. The transmission bearing 12 can support the delay tube 11 and prevent the delay tube 11 from being moved upward by the force when the bearing block 8 moves along the inner wall of the spiral groove, which would affect the normal rotation of the delay tube 11 and the deformation of the spring 10. At the same time, it can also improve the stability and smoothness of the rotation of the delay tube 11.

[0037] The take-up and take-down frame 3 is designed with a U-shaped structure, and a shock absorber 4 is fixedly installed at the end of the take-up and take-down frame 3 that is close to the ground. The small end of the shock absorber 4 is fixedly connected to the outer wall of the support frame 5. When the return spring is compressed to its maximum value, the small end of the shock absorber 4 retracts, which is beneficial for secondary shock absorption of the roller 9.

[0038] A shock-absorbing spring is fixedly installed at one end of the shock absorber 4 near the ground, and the other end of the shock-absorbing spring is fixedly connected to the top of the support frame 5. When the return spring is compressed, the support frame 5 moves upward due to the large force exerted by the ground on the roller 9. At this time, the shock-absorbing spring is compressed, and the small end of the shock absorber 4 moves upward. When the shock-absorbing spring extends, the shock absorber 4 can generate resistance when the shock-absorbing spring is compressed and released, which slows down the rebound speed of the shock-absorbing spring, thereby reducing the bumps and vibrations encountered by the model aircraft as it moves along the ground.

[0039] The model aircraft has a fixed support frame 1 inside. Inside the support frame 1, an adjusting rod 2 is installed via a motor. The end of the retractable frame 3 away from the shock absorber 4 is fixedly connected to the outer wall of the adjusting rod 2. The support frame 1 is designed with a U-shaped structure. The two ends of the adjusting rod 2 are rotatably connected to the two sides of the inner cavity of the support frame 1. At the same time, a worm gear is fixedly installed at one end of the adjusting rod 2. A worm gear that meshes with the worm gear is fixedly installed at the power output end of the motor. When the power output end of the motor rotates, the worm gear rotates accordingly, thereby causing the adjusting rod 2 to rotate as well. This facilitates the retraction and deployment of the retractable frame 3 and positions the retractable frame 3 after it has been retracted or deployed.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A retractable dual-shock-damping landing gear for small model aircraft, characterized in that: include The launch and take-up frame (3) has a support frame (5) elastically installed at one end near the ground. The support frame (5) has load-bearing blocks (8) symmetrically and elastically installed on both sides. A roller (9) for moving the model aircraft along the ground is rotatably installed between the two load-bearing blocks (8) through a pivot. Mounting cylinders (6) are symmetrically mounted on both sides of the support frame (5). The two mounting cylinders (6) are located directly above the two bearing blocks (8). Delay tubes (11) are rotatably mounted in the inner cavity of the two mounting cylinders (6). A slide rod (7) is slidably mounted in the inner cavity of the delay tube (11). A spring (10) connected to the inner wall of the mounting cylinder (6) is fixedly mounted on the top of the delay tube (11). The end of the slide rod (7) away from the spring (10) is fixedly connected to the outer wall of the bearing block (8). A spiral groove is formed on the inner wall of the delay tube (11). A movable block (13) is symmetrically fixed on the outer wall of the slide rod (7). The end of the movable block (13) away from the slide rod (7) extends into the inner cavity of the spiral groove. The reset spring is sleeved on the outside of the slide rod (7), with one end fixedly connected to the outer wall of the bearing block (8) and the other end fixedly connected to the end of the mounting cylinder (6) near the bearing block (8).

2. The retractable dual-shock-damping landing gear for small model aircraft according to claim 1, characterized in that: The support frame (5) is configured as a U-shaped structure, and sliding grooves are symmetrically provided on both sides of the support frame (5). The end of the rotating shaft away from the roller (9) passes through the sliding groove and is rotatably connected to the outer wall of the bearing block (8).

3. The retractable dual-shock-damping landing gear for small model aircraft according to claim 1, characterized in that: The outer wall of the delay tube (11) is fixedly sleeved with a transmission bearing (12), and the outer wall of the transmission bearing (12) is fixedly connected to the inner wall of the mounting cylinder (6) through a connecting block.

4. The retractable dual-shock-damping landing gear for small model aircraft according to claim 1, characterized in that: The take-up and take-down rack (3) is configured as a U-shaped structure, and a shock absorber (4) is fixedly installed at one end of the take-up and take-down rack (3) near the ground. The small end of the shock absorber (4) is fixedly connected to the outer wall of the support frame (5).

5. The retractable dual-shock-damping landing gear for small model aircraft according to claim 4, characterized in that: The shock absorber (4) has a shock-absorbing spring fixedly installed at one end near the ground, and the other end of the shock-absorbing spring is fixedly connected to the top of the support frame (5).

6. The retractable dual-shock-damping landing gear for small model aircraft according to claim 1, characterized in that: The model aircraft is fixedly installed with a support frame (1) inside. An adjustment rod (2) is installed inside the support frame (1) by rotating a motor. The end of the take-up and take-down frame (3) away from the shock absorber (4) is fixedly connected to the outer wall of the adjustment rod (2).

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