Seesaw type propeller hub structure

Abstract

The utility model relates to the technical field of unmanned aerial vehicles, and discloses a seesaw type propeller hub structure which comprises a propeller body, the end face of the propeller body is fixedly connected with a propeller metal lining, and a limiting assembly is arranged outside the propeller body. According to the seesaw type propeller hub structure, when the propeller body is in a static or low-speed rotating state, a certain gap is kept between the limiting block and the propeller clamp lower pressing plate, when the propeller body encounters abnormal conditions such as gust, the limiting block can make contact with the propeller clamp lower pressing plate, and the flapping torque of the propeller body is transmitted to the propeller hub center piece; and when the propeller rotates, the elastic damper makes contact with the propeller body for compression, the elastic deformation process of the elastic damper absorbs energy, provides elastic force, reduces impact loads generated in the waving process, limits the propeller body and avoids mechanical damage.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, specifically a seesaw-type propeller hub structure. Background Technology

[0002] With the continuous maturation of flight control and motor technologies, aircraft are increasingly widely used in the civilian sector. Currently, these aircraft use a certain mechanical connection structure to mount the propeller on the drive motor. The connection structure serves to fix the propeller, transmit lift, and transmit torque. The propeller is an important component of rotorcraft, used to convert the rotation of the output shaft in the motor or engine into thrust or lift to enable the aircraft to take off, land, turn, hover, etc. A propeller generally includes a hub and blades. The hub is connected to the output shaft of the motor through a transmission component. When the motor drives the output shaft to rotate, the hub connected to the output shaft also rotates, thereby driving the blades fixed on the hub to rotate to form a propeller disk, which in turn drives the airflow near the blades to generate lift or thrust for the rotorcraft.

[0003] Existing seesaw-type propellers suffer from the problem of either unlimited or limited positioning, failing to mitigate the rigid collision between the blades during flapping and the limiting position. Furthermore, when used as lift propellers in aircraft, during transitional flight or level cruise phases, the lift propeller speed decreases while the aircraft speed increases, causing the advancing and retreating blades to experience different incoming flow velocities, resulting in blade flapping. Simultaneously, the centrifugal force generated by the corresponding lift propeller speed is insufficient to overcome the blade flapping. Therefore, the seesaw-type propeller itself needs to maintain torsional stiffness, making the limiting mechanism for the blade flapping position particularly important. In view of this, we propose a seesaw-type propeller hub structure. Utility Model Content

[0004] The purpose of this invention is to provide a seesaw-type propeller hub structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a seesaw-type propeller hub structure, including a propeller body, a propeller metal bushing fixedly connected to the end face of the propeller body, and a limiting component provided on the outside of the propeller body, the limiting component including:

[0006] The fixed column is fixedly connected to the central component of the propeller hub. The top of the central component of the propeller hub is fixedly connected to a boss and a support seat. The boss is rotatably connected to the limiting pin, and the limiting pin is fixedly connected to the limiting block.

[0007] The rotating shaft is rotatably connected to the support base. The rotating shaft is sleeved with the bearing. The outer wall of the rotating shaft is sleeved with the upper pressure plate of the propeller clamp. The upper pressure plate of the propeller clamp is sleeved with the bolt. The bolt is sleeved with the lower pressure plate of the propeller clamp.

[0008] Elastic damping is fixedly connected to the top end face of the central component of the propeller hub, and a limit component is fixedly connected to the inner wall of the elastic damping.

[0009] The propeller body is a composite material structure formed by molding and thermosetting. The propeller body is located between the upper pressure plate and the lower pressure plate of the propeller clamp. The surface of the propeller metal bushing has pre-reserved holes and is bored. The propeller body is connected to the bolt through the holes on the propeller metal bushing. The fairing is fixedly connected to the outer wall of the propeller body.

[0010] The bottom end face of the propeller hub central component is provided with mounting screw holes. Several sets of mounting screw holes are provided, which penetrate the bottom end face of the propeller hub central component. The propeller hub central component is then fixed to the output end of the motor or power mechanism through the screw holes.

[0011] A spring is fixedly connected to the end face of the limiting block. The end of the spring away from the limiting block is fixedly connected to the fixed post. When the spring is not stretched, the limiting block supports the lower pressure plate of the propeller clamp, and the propeller clamp does not swing. When the spring is stretched, the limiting block also supports the lower pressure plate of the propeller clamp, thus limiting the swing of the propeller clamp.

[0012] The inner wall of the support base has bearing mounting holes, and the bearings are interference-fitted with the bearing mounting holes. The upper pressure plate of the propeller clamp has mounting holes inside, and the mounting holes are interference-fitted with the bushings. The bushings are sleeved with the rotating shaft. The upper pressure plate and the lower pressure plate of the propeller clamp are connected to the central component of the propeller hub through the bearings.

[0013] A protrusion is fixedly connected to the top end face of the central component of the propeller hub. A reserved hole is opened on the end face of the protrusion, and the reserved hole is fixedly connected to the buffer. A limit plate is fixedly connected to the bottom of the propeller clamp pressure plate, and the limit plate is movably connected to the buffer.

[0014] A fixed seat is fixedly connected to the top end face of the central component of the propeller hub. The fixed seat is sleeved with the limiting pin, the limiting pin is sleeved with the elastic bushing, the elastic bushing is sleeved with the propeller clamp, and a shaft clip is engaged with the side wall of the limiting pin.

[0015] Compared with the prior art, this utility model provides a seesaw-type propeller hub structure, which has the following beneficial effects:

[0016] 1. This seesaw-type propeller hub structure, through the setting of limiting components, ensures that when the propeller body is stationary or rotating at low speed, the limiting block and the lower pressure plate of the propeller clamp maintain a certain gap. When the propeller body encounters abnormal situations such as gusts of wind, the limiting block can contact the lower pressure plate of the propeller clamp and transfer the flapping torque of the propeller body to the central component of the hub, thereby achieving the limiting function. When the propeller rotates, the elastic damper on one side contacts and compresses the propeller body, while the elastic damper on the other end flaps up through elastic deformation, and vice versa. The elastic deformation process of the elastic damper absorbs energy and provides elastic force, reducing the impact load generated during the flapping process, limiting the propeller body, avoiding mechanical damage, and avoiding the impact on the stability of the aircraft.

[0017] 2. The seesaw-type propeller hub structure, through the set buffer, when the propeller body, the upper pressure plate of the propeller clamp, and the lower pressure plate of the propeller clamp swing, the limiting plate extending from below the lower pressure plate of the propeller clamp contacts the top rod on the buffer, which keeps the propeller blade amplitude limited, absorbs energy to reduce vibration, and improves the stability of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main body structure of this utility model from a bottom view;

[0019] Figure 2 This is a schematic diagram of the propeller body structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the main structure of the present utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the central component of the propeller hub of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0023] Figure 6 This is a schematic diagram of the limiting block structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the cross-sectional structure of the support base of this utility model;

[0025] Figure 8 This is a schematic diagram of the cross-sectional structure of the upper pressure plate of the paddle clamp of this utility model;

[0026] Figure 9 This is a schematic diagram of the elastic damping structure of this utility model;

[0027] Figure 10 This is a schematic diagram of the paddle clamp lower pressure plate structure in Embodiment 2 of this utility model.

[0028] In the diagram: 1. Propeller body; 2. Hub center component; 3. Limiting assembly; 301. Fixing post; 302. Boss; 303. Support base; 304. Limiting pin; 305. Limiting block; 306. Spring; 307. Bearing; 308. Rotating shaft; 309. Upper pressure plate of propeller clamp; 310. Bushing; 311. Bolt; 312. Lower pressure plate of propeller clamp; 313. Elastic damping; 314. Limiting component; 4. Fairing; 5. Propeller metal bushing; 10. Buffer; 11. Boss; 12. Limiting plate. Detailed Implementation

[0029] Example 1

[0030] like Figures 1-4 , Figures 6-9 As shown, this utility model provides a technical solution: a seesaw-type propeller hub structure, including a propeller body 1, a propeller metal bushing 5 fixedly connected to the end face of the propeller body 1, and a limiting component 3 provided on the outside of the propeller body 1. The limiting component 3 includes a fixing post 301, a boss 302, a support base 303, a limiting pin 304, a limiting block 305, a spring 306, a bearing 307, a rotating shaft 308, an upper pressure plate of the propeller clamp 309, a bushing 310, a bolt 311, a lower pressure plate of the propeller clamp 312, an elastic damping 313, and a limiting member 314.

[0031] In one embodiment of this utility model, the fixing post 301 is fixedly connected to the central component 2 of the propeller hub. The bottom end face of the central component 2 of the propeller hub is provided with mounting screw holes. Several sets of mounting screw holes are provided, penetrating the bottom end face of the central component 2. The central component 2 of the propeller hub is then fixed to the output end of the motor or power mechanism through these screw holes. The top of the central component 2 is fixedly connected to a boss 302 and a support base 303. The boss 302 is rotatably connected to a limiting pin 304. The limiting pin 304 is fixedly connected to a limiting block 305. A spring 306 is fixedly connected to the end face of the limiting block 305. The end of the spring 306 away from the limiting block 305 is fixedly connected to the fixing post 301. When the spring 306 is not stretched, the limiting block... 305 provides support to the lower pressure plate of the propeller clamp, preventing the propeller clamp from swinging. When the spring 306 is stretched, the limiting block 305 provides support to the lower pressure plate 312 of the propeller clamp, limiting the angle of the propeller clamp swing. The propeller body 1 is a composite material structure formed by molding and thermosetting. The propeller body 1 is located between the upper pressure plate 309 and the lower pressure plate 312 of the propeller clamp. The surface of the propeller metal bushing 5 is pre-drilled with holes. The propeller body 1 is connected to the bolt 311 through the holes on the propeller metal bushing 5. The outer wall of the propeller body 1 is fixedly connected to the fairing 4. The fairing 4 is located above the central part 2 of the propeller hub and is connected to the starting surface of the airfoil of the propeller body 1. It rotates with the shaft 308 to ensure the overall aerodynamic shape of the propeller body 1.

[0032] The rotating shaft 308 is rotatably connected to the support base 303. The rotating shaft 308 is sleeved with the bearing 307. The bearing 307 includes, but is not limited to, a radial spherical bearing, or an elastic bearing, or a bushing. The outer wall of the rotating shaft 308 is sleeved with the upper pressure plate 309 of the propeller clamp. The upper pressure plate 309 of the propeller clamp is sleeved with the bolt 311. The bolt 311 is sleeved with the lower pressure plate 312 of the propeller clamp. The inner wall of the support base 303 has a bearing mounting hole. The bearing 307 is interference-fitted with the bearing mounting hole. The upper pressure plate 309 of the propeller clamp has a mounting hole inside. The mounting hole is interference-fitted with the bushing 310. The bushing 310 is sleeved with the rotating shaft 308. The upper pressure plate 309 and the lower pressure plate 312 of the propeller clamp are connected to the central part 2 of the propeller hub through the bearing 307.

[0033] In addition, the elastic damper 313 is fixedly connected to the top end face of the central component 2 of the propeller hub, and the inner wall of the elastic damper 313 is fixedly connected to the limiting component 314. When the propeller rotates, the elastic damper 313 on one side contacts and compresses with the propeller body 1, while the elastic damper 313 on the other end is lifted by elastic deformation, and vice versa. The elastic deformation process of the elastic damper 313 absorbs energy and provides elastic force, reducing the impact load generated during the flapping process. The limiting component 314 installed in the middle of the elastic damper 313 limits the maximum flapping amount of the propeller body 1, limits the propeller body 1, avoids mechanical damage, and avoids the impact on the stability of the aircraft.

[0034] In this invention, during use, when the propeller body 1 is stationary or rotating at low speed, the limiting block 305 maintains a certain gap with the propeller clamp lower pressure plate 312. When the propeller body 1 encounters abnormal situations such as sudden wind, the limiting block 305 can contact the propeller clamp lower pressure plate 312 and transmit the flapping torque of the propeller body 1 to the central part 2 of the propeller hub, thereby realizing the limiting function. When the propeller body 1 is not rotating, the propeller clamp does not flap, the spring 306 is not stretched, and the limiting block 305 provides support for the propeller clamp lower pressure plate. When the propeller body 1 rotates, the left side of the limiting block 305 rotates to 9... When the propeller clamp is pushed upward at 0 degrees, the limiting block 305 supports the lower pressure plate 312 of the propeller clamp, limiting the angle of the propeller clamp swing. The seesaw propeller hub is designed at 45 degrees. The blades of the propeller body 1 will be subjected to a large torsional force when working. If the angle is too small, it is easy to cause the blades to twist or be damaged, affecting the safety of the aircraft. When the angle is 45 degrees, the anti-torsion performance of the blades can be enhanced, and its service life and reliability can be improved. At the angle of 45 degrees, the lift generated by the blades is equal to the drag, which can reduce the drag generated by the aircraft fuselage and improve the stability and flight efficiency of the aircraft.

[0035] Example 2

[0036] like Figure 5 , Figure 10As shown, the present invention improves upon Embodiment 1 to obtain a new technical solution: a protrusion 11 is fixedly connected to the top end face of the central component 2 of the propeller hub, and a reserved hole is opened on the end face of the protrusion 11. The reserved hole is fixedly connected to the buffer 10. A limiting plate 12 is fixedly connected to the bottom of the propeller clamp lower pressure plate 312. The limiting plate 12 is movably connected to the buffer 10. The buffer 10 itself has an adjustment knob, and its effective weight coverage range is wider. The torsional stiffness of the corresponding propeller blade flapping can also be adjusted. When the propeller body 1, the upper pressure plate 309 of the propeller clamp, and the lower pressure plate 312 of the propeller clamp flap, the limiting plate 12 extending below the lower pressure plate 312 of the propeller clamp contacts the top rod on the buffer 10, maintaining the propeller blade amplitude limit while absorbing energy to reduce vibration and improve the stability of the device.

[0037] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A seesaw type propeller hub structure, comprising a propeller body (1), an end surface of the propeller body (1) is fixedly connected with a propeller metal bushing (5), characterized in that: The propeller body (1) is externally provided with a limiting assembly (3), which comprises: A fixed column (301) is fixedly connected with a propeller hub central part (2), the top of the propeller hub central part (2) is fixedly connected with a boss (302) and a support seat (303), the boss (302) is fixedly and rotatably connected with a limiting pin shaft (304), and the limiting pin shaft (304) is rotatably connected with a limiting block (305); A rotating shaft (308) is rotatably connected with the support seat (303), the rotating shaft (308) is sleeved with a bearing (307), the outer wall of the rotating shaft (308) is sleeved with a propeller clamp upper pressing plate (309), the propeller clamp upper pressing plate (309) is sleeved with a bolt (311), and the bolt (311) is sleeved with a propeller clamp lower pressing plate (312); An elastic damping (313) is fixedly connected to the top end face of the propeller hub central part (2), and the inner wall of the elastic damping (313) is fixedly connected with a limiting piece (314).

2. A seesaw propeller hub structure according to claim 1, characterized in that: The propeller body (1) is a composite structure molded by hot solidification, the propeller body (1) is located between the propeller clamp upper pressing plate (309) and the propeller clamp lower pressing plate (312), the surface of the propeller metal bushing (5) is bored with a reserved hole, the propeller body (1) is sleeved with the bolt (311) through the hole on the propeller metal bushing (5), and the outer wall of the propeller body (1) is fixedly connected with a fairing (4).

3. A seesaw propeller hub structure according to claim 1, characterized in that: A mounting screw hole is formed in the bottom end face of the propeller hub central part (2), a plurality of groups of the mounting screw holes are arranged on the bottom end face of the propeller hub central part (2).

4. A seesaw propeller hub structure according to claim 1, characterized in that: The end face of the limiting block (305) is fixedly connected with a spring (306), and the end, away from the limiting block (305), of the spring (306) is fixedly connected with the fixed column (301).

5. A seesaw propeller hub structure according to claim 1, characterized in that: The inner wall of the support seat (303) is provided with a bearing mounting hole, the bearing (307) is interference-fitted with the bearing mounting hole, the inner part of the propeller clamp upper pressing plate (309) is provided with a mounting hole, the mounting hole is interference-fitted with a shaft sleeve (310), and the shaft sleeve (310) is sleeved with the rotating shaft (308).

6. A seesaw propeller hub structure according to claim 1, wherein: The top end face of the propeller hub central part (2) is fixedly connected with a raised platform (11), the end face of the raised platform (11) is provided with a reserved hole, the reserved hole is fixedly connected with a bumper (10), the bottom of the propeller clamp lower pressing plate (312) is fixedly connected with a limiting plate (12), and the limiting plate (12) is movably connected with the bumper (10).

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