Vibration reduction and limiting structure for rotor head of unmanned aerial vehicle

Abstract

The utility model provides an unmanned aerial vehicle rotor head damping and limiting structure which comprises a rotor mounting seat, a transverse shaft and a rotor clamp, the first end of the transverse shaft is connected with the rotor mounting seat, and the second end of the transverse shaft is connected with the rotor clamp; the rotor mounting seat is provided with a mounting groove, the first end of the transverse shaft is inserted into the mounting groove and is connected with the mounting groove through a mounting bolt, the shape of the first end of the transverse shaft is matched with that of the mounting groove, and the mounting groove is in a non-cylindrical shape; a vibration reduction groove is formed in the first end of the transverse shaft, vibration reduction rubber balls are placed in the vibration reduction groove, the vibration reduction rubber balls are made of elastic materials, and the vibration reduction rubber balls make contact with the inner wall of the installation groove. The buffering and damping effect of the first end of the transverse shaft can be guaranteed, meanwhile, the structure manufacturing difficulty is lowered, and installation convenience is improved.

Description

Technical Field

[0001] This utility model relates to the field of drone rotor head technology, and in particular to a drone rotor head vibration reduction and limiting structure. Background Technology

[0002] Unmanned aerial vehicles (UAVs) are unmanned aircraft controlled by radio remote control equipment and their own program control system. With the development of UAV technology, UAVs have played an indispensable role in aerial photography, inspection, stability maintenance, reconnaissance, rescue, and plant protection, and occupy an extremely important position in both civilian and military fields.

[0003] Unmanned helicopters, a type of drone, typically feature rotors and hold a significant position in the drone industry due to their flexibility and maneuverability. As the payload requirements of unmanned helicopters continue to increase, their size is also growing, necessitating larger rotor designs. A rotor generally consists of a rotor head and rotor blades. Since the rotor directly provides upward lift and forward force in different directions, the rotor blades connected to the rotor head need to maintain a certain angle of attack and rotational speed. In other words, the rotor head connects to and controls the rotor blades. Currently, mature helicopter rotor heads are mostly derived from manned helicopters. Most rotor heads are large and relatively complex in structure, some even requiring hydraulic shock absorption structures, further increasing their weight, production costs, design complexity, and maintenance expenses.

[0004] Existing technologies also disclose rotor heads for unmanned helicopters, including a T-shaped rotor and two identical rotating components symmetrically connected to the left and right ends of the T-shaped rotor. Each rotating component includes a horizontal shaft, a rotor clamp, etc. The first end of the horizontal shaft is connected to a horizontal hole in the T-shaped rotor and fixed by a first shoulder screw, while the second end is connected to the rotor clamp. A rubber damping sleeve is provided at the connection between the horizontal shaft and the T-shaped rotor. The rubber damping sleeve wraps around the horizontal shaft, and the elastic rubber material allows for a certain degree of deformation. This allows the horizontal shaft to swing within the T-shaped rotor during operation, and the rubber damping sleeve provides sufficient deformation to reduce the swing amplitude of the horizontal shaft within the T-shaped rotor, eliminating the need for hydraulic damping devices. However, when the size of the rotor head increases further, the shape of the first end of the horizontal shaft is usually not cylindrical to avoid loading all the torque of rotation around the centerline onto the first shoulder screw. Therefore, using a rubber damping sleeve would result in a more complex shape and more difficult installation, requiring further improvement. Utility Model Content

[0005] The purpose of this utility model is to provide a rotor head vibration reduction and limiting solution that is simpler in structure and easier to install, in order to address the shortcomings of the above-mentioned background technology.

[0006] To achieve the above objectives, this utility model provides a vibration reduction and limiting structure for a drone rotor head, including a rotor mounting base, a horizontal shaft, and a rotor clamp. The first end of the horizontal shaft is connected to the rotor mounting base, and the second end of the horizontal shaft is connected to the rotor clamp.

[0007] The rotor mounting base is provided with a mounting groove, the first end of the horizontal shaft is inserted into the mounting groove and connected to the mounting groove by mounting bolts, the shape of the first end of the horizontal shaft matches the mounting groove, and the shape of the mounting groove is non-cylindrical;

[0008] A vibration damping groove is provided at the first end of the horizontal shaft, and a vibration damping ball is placed in the vibration damping groove. The vibration damping ball is made of elastic material and is in contact with the inner wall of the mounting groove.

[0009] Furthermore, each section of the mounting groove along the depth direction is set as a rectangle.

[0010] Furthermore, the vibration damping groove is disposed on the upper and lower surfaces of the first end of the horizontal shaft.

[0011] Furthermore, the damping rubber ball is cylindrical, the damping groove at the first end of the horizontal shaft is semi-cylindrical, and the inner wall of the mounting groove is also provided with a semi-cylindrical damping groove.

[0012] Furthermore, the rotor mounting base includes a base body, an upper base cover, and a lower base cover. The upper base cover and the lower base cover are detachably connected to the base body, and the vibration damping grooves of the mounting groove are located on the inner surfaces of the upper base cover and the lower base cover, respectively.

[0013] Furthermore, the upper and lower surfaces of the first end of the horizontal axis are set as inclined surfaces so that the damping rubber ball can generate two mutually orthogonal reaction components on the first end of the horizontal axis.

[0014] Furthermore, bolt mounting holes are provided on the left and right surfaces of the first end of the horizontal shaft, and through holes are provided in the mounting groove. The mounting bolts are inserted into the through holes and the bolt mounting holes to connect the first end of the horizontal shaft with the rotor mounting base.

[0015] Furthermore, two sets of bolt mounting holes and through holes are provided, and they are distributed back and forth along the axial direction of the transverse axis.

[0016] The above-mentioned solution of this utility model has the following beneficial effects:

[0017] The drone rotor head vibration reduction and limiting structure provided by this utility model, through the vibration reduction groove, vibration reduction rubber ball and rotor mounting base at the first end of the horizontal shaft, can ensure the buffering and vibration reduction effect at the first end of the horizontal shaft, while reducing the difficulty of structural manufacturing and improving the ease of installation. At the same time, it makes the connection between the first end of the horizontal shaft and the rotor mounting base more solid. For heavy-load drones, the reliability and service life of the rotor head can be further improved.

[0018] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the three-rotor of this utility model;

[0020] Figure 2 This is a cross-sectional view of the internal structure of this utility model;

[0021] Figure 3 This is a schematic diagram showing the position of the first end of the horizontal axis and the mounting groove of this utility model;

[0022] Figure 4 This is a schematic diagram of the dual rotor of this utility model.

[0023] [Explanation of Labels in the Attached Image]

[0024] 1-Rotor mounting base; 2-Horizontal shaft; 3-Rotor clamp; 4-Mounting groove; 5-Vibration damping groove; 6-Vibration damping rubber ball; 7-Base body; 8-Upper base cover; 9-Lower base cover; 10-Bolt mounting hole; 11-Metal protective sleeve. Detailed Implementation

[0025] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0028] like Figures 1-3 As shown, an embodiment of this utility model provides a vibration damping and limiting structure for a drone rotor head, including a rotor mounting base 1, a horizontal shaft 2, and a rotor clamp 3. The first end of the horizontal shaft 2 is connected to the rotor mounting base 1, which supports and fixes the horizontal shaft 2. The second end of the horizontal shaft 2 is movably connected to the rotor clamp 3, which can rotate relative to the horizontal shaft 2 around a centerline. The rotor blades held by the rotor clamp 3 can have their angle adjusted relative to the centerline. Furthermore, a horizontal shaft rotary bearing and a horizontal shaft thrust bearing are provided between the rotor clamp 3 and the horizontal shaft 2. The horizontal shaft rotary bearing provides rotational support, while the horizontal shaft thrust bearing resists centrifugal force during rotation.

[0029] In this embodiment, the rotor mounting base 1 is provided with a mounting groove 4, and the first end of the transverse shaft 2 is inserted into the mounting groove 4, with the shape of the first end of the transverse shaft 2 matching the shape of the mounting groove 4. As a preferred embodiment, each cross-section of the mounting groove 4 along its depth direction is rectangular, and the shape of the first end of the transverse shaft 2 matches it. Therefore, compared to a cylindrical fit, this rectangular fit restricts the degree of freedom of the transverse shaft 2 to rotate around its centerline, avoiding the complete reliance on mounting bolts for limiting this degree of freedom, which could lead to loosening or damage of the mounting bolts under long-term alternating loads.

[0030] In this embodiment, a vibration damping groove 5 is provided at the first end of the horizontal shaft 2, and a vibration damping ball 6 is placed inside the vibration damping groove 5. The vibration damping ball 6 is made of an elastic material, such as rubber, and it contacts the inner wall of the mounting groove 4. Therefore, when the horizontal shaft 2 is subjected to alternating loads (transmitted by the rotor blades), the vibration damping ball 6 can buffer and dampen the vibration between the first end of the horizontal shaft 2 and the mounting groove 4, preventing excessive vibration from affecting the flight stability of the UAV and avoiding long-term structural loosening and deformation.

[0031] In a preferred embodiment, the vibration damping groove 5 is provided on the upper and lower surfaces of the first end of the horizontal shaft 2, while the left and right surfaces are not provided because the rotor mounting base 1 is rotatable, and the vibration in this direction is small (the horizontal shaft 2 swings left and right). The vibration damping balls 6 on the upper and lower surfaces can effectively buffer and dampen the first end of the horizontal shaft 2 (the horizontal shaft 2 swings up and down).

[0032] In a preferred embodiment, the damping rubber ball 6 is cylindrical, and the damping groove 5 at the first end of the horizontal shaft 2 is semi-cylindrical. Correspondingly, a semi-cylindrical damping groove 5 is also provided on the inner wall of the mounting groove 4. Therefore, when the horizontal shaft 2 is connected to the rotor mounting seat 1, the damping rubber ball 6 can be stably accommodated in the two semi-cylindrical damping grooves 5, ensuring the buffering and damping effect on the horizontal shaft 2.

[0033] In a preferred embodiment, the rotor mounting base 1 in this example consists of a base body 7, an upper base cover 8, and a lower base cover 9. The upper base cover 8 and the lower base cover 9 are detachably connected to the base body 7 by screws. The upper and lower parts of the mounting groove 4 are also composed of the upper base cover 8 and the lower base cover 9, respectively. The vibration damping grooves 5 of the mounting groove 4 are located on the inner surfaces of the upper base cover 8 and the lower base cover 9, respectively. Therefore, when installing the horizontal shaft 2, the lower base cover 9 can be assembled with the base body 7 first, and the lower layer of vibration damping balls 6 can be placed into the mounting groove 4 of the lower base cover 9. Then, the first end of the horizontal shaft 2 can be placed into the mounting groove 4. After the lower layer of vibration damping balls 6 are engaged, the upper layer of vibration damping balls 6 can be placed into the vibration damping groove 5 on the upper surface of the first end of the horizontal shaft 2. Finally, the upper base cover 8 can be installed, ensuring that the upper layer of vibration damping balls 6 are engaged. Therefore, this structure improves the ease of assembly.

[0034] In a preferred embodiment, the area of ​​each cross section of the mounting groove 4 along the depth direction decreases inwards, so that the upper and lower surfaces of the first end of the mounting groove 4 and the horizontal shaft 2 form inclined surfaces. By setting the inclined surfaces, the damping rubber ball 6 can generate two mutually orthogonal reaction components on the first end of the horizontal shaft 2, and its buffering and damping effect can be better.

[0035] In this embodiment, bolt mounting holes 10 are provided on both the left and right surfaces of the first end of the horizontal shaft 2, and the bolt mounting holes 10 on both sides are connected. Correspondingly, the mounting groove 4 is also provided with through holes. When the horizontal shaft 2 and the rotor mounting base 1 are in place, the through holes are aligned with the bolt mounting holes 10, and the first end of the horizontal shaft 2 can be fixed to the mounting groove 4 by mounting bolts.

[0036] In a preferred embodiment, two sets of bolt mounting holes 10 and through holes are provided, distributed back and forth along the axial direction of the horizontal axis 2. This method can better suppress the swing amplitude of the horizontal axis 2, and the two sets of mounting bolts can further improve redundancy and reliability. In addition, a metal protective sleeve 11 is further provided in the through hole. The metal protective sleeve 11 is inserted into the through hole, or it can be partially inserted into the bolt mounting hole 10 to protect the mounting bolt. When replacing, only the metal protective sleeve 11 needs to be replaced.

[0037] It should be noted that the UAV rotor head vibration reduction and limiting structure provided in this embodiment is applicable to both... Figure 1 The tri-rotor configuration shown is also applicable to... Figure 2 The dual-rotor configuration shown is also applicable to other quadcopter and hexcopter configurations, and those skilled in the art can make flexible choices based on size design and other factors.

[0038] In summary, the UAV rotor head and limiting structure provided in this embodiment, through the damping groove 5, damping rubber ball 6, and rotor mounting base 1 at the first end of the horizontal shaft 2, can ensure the buffering and damping effect at the first end of the horizontal shaft 2, while reducing the difficulty of structural manufacturing and improving the ease of installation. At the same time, it makes the connection between the first end of the horizontal shaft 2 and the rotor mounting base 1 more secure. For UAVs with large payloads, the reliability and service life of the rotor head can be further improved.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A vibration-damping and limiting structure for a rotor head of a UAV, characterized in that, The rotor mounting seat, the horizontal shaft and the rotor clamp, the first end of the horizontal shaft is connected with the rotor mounting seat, the second end of the horizontal shaft is connected with the rotor clamp; The rotor mounting seat is provided with a mounting slot, the first end of the horizontal shaft is inserted into the mounting slot, and is connected with the mounting slot through a mounting bolt, the shape of the first end of the horizontal shaft matches the mounting slot, and the shape of the mounting slot is non-cylindrical; The first end of the horizontal shaft is provided with a damping groove, a damping rubber ball is placed in the damping groove, the damping rubber ball is made of elastic material, and the damping rubber ball is in contact with the inner wall of the mounting slot.

2. The unmanned aerial vehicle rotor head damping and limiting structure of claim 1, wherein, Each cross section of the mounting slot along the depth direction is rectangular.

3. The unmanned aerial vehicle rotor head damping and limiting structure of claim 1, wherein, The damping groove is arranged on the upper surface and the lower surface of the first end of the horizontal shaft.

4. The unmanned aerial vehicle rotor head damping and limiting structure of claim 1, wherein, The damping rubber ball is cylindrical, the damping groove of the first end of the horizontal shaft is semicylindrical, and the inner wall of the mounting slot is also provided with a semicylindrical damping groove.

5. The unmanned aerial vehicle rotor head damping and limiting structure according to claim 4, characterized in that, The rotor mounting seat comprises a seat body, an upper seat cover and a lower seat cover, the upper seat cover, the lower seat cover and the seat body are detachably connected, and the damping grooves of the mounting slot are respectively located on the inner surfaces of the upper seat cover and the lower seat cover.

6. The unmanned aerial vehicle rotor head damping and limiting structure of claim 3, wherein, The upper surface and the lower surface of the first end of the horizontal shaft are inclined surfaces, so that the damping rubber ball can generate two mutually orthogonal reaction forces on the first end of the horizontal shaft.

7. The unmanned aerial vehicle rotor head damping and limiting structure of claim 1, wherein, The left surface and the right surface of the first end of the horizontal shaft are provided with bolt mounting holes, the mounting slot is correspondingly provided with through holes, the mounting bolt is inserted into the through holes and the bolt mounting holes to connect the first end of the horizontal shaft with the rotor mounting seat.

8. The unmanned aerial vehicle rotor head damping and limiting structure of claim 7, wherein, The bolt mounting hole and the through hole are provided with two groups, and are distributed forward and backward along the axial direction of the horizontal shaft.

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