Paddle clamp mechanism, paddle structure and rotor craft

Abstract

The utility model discloses a paddle clamp mechanism, a paddle structure and a rotor craft, the paddle clamp mechanism comprises a mounting seat and a connecting assembly, the mounting seat comprises a mounting body, the mounting body is used for being connected with a motor, and the motor is used for driving a paddle to rotate around a rotation axis of a rotor of the motor; the connecting assembly comprises a connecting body, and the connecting body is used for mounting the paddle; wherein one of the mounting seat and the connecting assembly comprises a mounting hole, the other one comprises a swing shaft, and the swing shaft is not parallel to the rotation axis of a rotor of the motor; the swing shaft is matched with the mounting hole to movably connect the connecting body to the mounting body, so that the paddle can swing around the axis of the swing shaft; the outer surface of the swing shaft is sleeved with a sliding bearing, and at least part of the sliding bearing is located between the outer surface of the swing shaft and the inner surface of the mounting hole.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft structures, and in particular to a propeller clamp mechanism, a propeller structure, and a rotorcraft. Background Art

[0002] During the flight of an aircraft, the blades move relative to the air. There is a significant difference in the aerodynamic forces of the blades in the forward and rearward areas, and the lift forces acting on the blades at different locations are uneven. If a rigid connection is used between the blades and the blade clamp mechanism, the uneven lift forces will produce alternating loads and be transmitted to the fuselage through the blades, which can easily cause vibration or instability of the aircraft's body, thereby affecting the normal flight and operation of the aircraft and even shortening the aircraft's service life. Utility Model Content

[0003] The present application provides a propeller clamp mechanism, a propeller structure and a rotorcraft.

[0004] According to the first aspect of the present application, the present application further provides a blade clamp mechanism for use with a rotorcraft blade, comprising:

[0005] a mounting base, the mounting base including a mounting body, the mounting body being configured to be connected to a motor, the motor being configured to drive the blade to rotate around a rotation axis of a rotor of the motor; and

[0006] A connecting assembly, the connecting assembly comprising a connecting body, the connecting body being used to mount the blade;

[0007] One of the mounting seat and the connecting assembly includes a mounting hole, and the other includes a swing shaft, wherein the swing shaft is not parallel to the rotation axis of the rotor of the motor; the swing shaft cooperates with the mounting hole to movably connect the connecting body to the mounting body, so that the blade can swing around the axis of the swing shaft;

[0008] The outer surface of the swing shaft is sleeved with a sliding bearing, and the sliding bearing is at least partially located between the outer surface of the swing shaft and the inner surface of the mounting hole.

[0009] In the paddle clamp mechanism of one embodiment of the present application, the sliding bearing includes a main body portion and a flange portion arranged at one end of the main body portion and extending outward in a radial direction of the swing shaft.

[0010] In the paddle clamp mechanism of one embodiment of the present application, the flange portion includes at least two stacked first flange pieces, and a first elastomer is filled between two adjacent first flange pieces.

[0011] In the paddle clamp mechanism of one embodiment of the present application, the elastic modulus of the first elastic body is smaller than the elastic modulus of the first flange piece.

[0012] In the paddle clamp mechanism of one embodiment of the present application, the material of the first flange piece is rubber or plastic; and / or the material of the first elastomer is rubber or plastic.

[0013] In the paddle clamp mechanism of one embodiment of the present application, the thickness of the flange portion is not less than the gap between the connecting body and the mounting body in the axial direction of the swing shaft.

[0014] In the paddle clamp mechanism of one embodiment of the present application, interference fit is adopted between the flange portion, the connecting body and the mounting body.

[0015] In the paddle clamp mechanism of one embodiment of the present application, the sliding bearing includes a first sliding bearing and a second sliding bearing, and the first sliding bearing and the second sliding bearing are arranged at opposite ends of the mounting hole along the axial direction of the swing shaft.

[0016] In the paddle clamp mechanism of one embodiment of the present application, the first sliding bearing and the second sliding bearing are connected at end surfaces close to each other; and / or,

[0017] The first sliding bearing and the second sliding bearing are capable of substantially covering an inner surface of the mounting hole.

[0018] In the paddle clamp mechanism of one embodiment of the present application, a first protrusion extends upward from the bottom of the mounting body, and a second protrusion extends downward from the bottom of the connecting body. The first protrusion and the second protrusion abut against each other to limit the connecting body.

[0019] In the paddle clamp mechanism of one embodiment of the present application, the first protrusion and the second protrusion abut against each other through their respective side surfaces.

[0020] In the paddle clamp mechanism of one embodiment of the present application, at least one of the first protrusion and the second protrusion has an elastic structure at the abutment portion.

[0021] In the paddle clamp mechanism of one embodiment of the present application, the connecting assembly includes the mounting hole, and the mounting seat includes the swing shaft.

[0022] In the paddle clamp mechanism of one embodiment of the present application, the connecting body is arranged in an axisymmetric manner relative to the mounting hole and / or the swing axis.

[0023] In the paddle clamp mechanism of one embodiment of the present application, the swing shaft is substantially perpendicular to the rotation axis of the rotor of the motor.

[0024] According to a second aspect of the present application, the present application further provides a paddle structure, comprising the above-mentioned paddle clamp mechanism and the paddle blade, wherein the paddle blade is mounted on the connecting body via a mounting shaft.

[0025] In the paddle structure of one embodiment of the present application, a buffer structure is provided on at least one end of the mounting shaft close to the connecting body, and the buffer structure includes at least two stacked second flange pieces, and a second elastomer is filled between two adjacent second flange pieces.

[0026] In the paddle structure of one embodiment of the present application, the elastic modulus of the second elastomer is smaller than the elastic modulus of the second flange piece.

[0027] According to a third aspect of the present application, the present application also provides a rotorcraft comprising the above-mentioned propeller structure.

[0028] The technical solution provided by the embodiments of the present application may include the following beneficial effects: The present application designs a propeller clamp mechanism, a propeller structure, and a rotorcraft, comprising a mounting seat and a connecting assembly, wherein the connecting body of the connecting assembly is movably connected to the mounting body of the mounting seat via a swing shaft, so that the propeller blades on the connecting body can swing around the swing shaft, thereby improving the lift imbalance between the forward and backward propeller blades of the rotorcraft during high-speed flight, effectively reducing instability during flight, and thus improving the working reliability of the rotorcraft body. A sliding bearing is sleeved on the outer surface of the swing shaft, and the sliding bearing is in line contact or surface contact with the swing shaft, so that the contact area between the swing shaft and the connecting body can be increased by the sliding bearing, which can greatly reduce the load borne by the sliding bearing, reduce the probability of wear, deformation, or damage of the sliding bearing, and improve the overall service life of the propeller clamp mechanism.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 is a structural schematic diagram of a paddle structure provided in one embodiment of the present application;

[0032] Figure 2 yes Figure 1 A partial structural diagram of the paddle structure;

[0033] Figure 3 yes Figure 1 A partial cross-sectional schematic diagram of the paddle structure;

[0034] Figure 4 yes Figure 1 A cross-sectional view of the paddle structure at another angle;

[0035] Figure 5 yes Figure 1 Exploded diagram of the propeller structure;

[0036] Figure 6 yes Figure 5 A schematic diagram of the structure of the installation body;

[0037] Figure 7 yes Figure 5 Exploded diagram of the sliding bearing in FIG;

[0038] Figure 8 yes Figure 5 Schematic diagram of the connection entity in ;

[0039] Figure 9 yes Figure 5 Schematic diagram of the decomposition of the buffer structure;

[0040] Figure 10 yes Figure 1 Mechanical diagram of the connecting body when it swings and collides with the mounting body;

[0041] Figure 11 yes Figure 1 Mechanical diagram of the connecting body when it swings and collides with the mounting body.

[0042] Description of reference numerals:

[0043] 100, paddle clamp mechanism;

[0044] 10. Mounting seat; 11. Mounting body; 111. First protrusion; 112. Rotating shaft hole; 114. Swinging slot; 12. Mounting hole;

[0045] 20. Connecting assembly; 21. Connecting body; 211. Second protrusion; 2111. First side protrusion; 2112. Second side protrusion; 212. First mounting groove; 213. Second mounting groove; 22. Swing shaft; 23. Sliding bearing; 23a. First sliding bearing; 23b. Second sliding bearing; 231. Main body; 232. Flange; 2321. First inner edge piece; 2322. First outer edge piece; 233. First elastic member;

[0046] 30. Elastic structure;

[0047] 200, paddle blade; 200a, first paddle blade; 200b, second paddle blade;

[0048] 300, install the shaft;

[0049] 400, buffer structure; 401, second flange piece; 402, second elastic body. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] It should also be understood that the terms used in this specification of the present application are only for the purpose of describing specific realities. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0052] In the related art, although there are some devices that can realize the movable connection between the blades and the blade clamp mechanism, the above-mentioned device has a ball bearing arranged outside the swing shaft. The ball bearing is subjected to the torque caused by the rotation of the blades in the rotating plane, the partial alternating torque generated by the uneven lift of the blades, and the impact force on the ball bearings when the blades swing. This will cause the ball bearings to bear a considerable load, and it is easy to cause problems such as wear, deformation or damage, resulting in a limited overall service life.

[0053] In this regard, the embodiments of the present application propose the following technical solutions.

[0054] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0055] like Figure 1 and Figure 2As shown, according to the first aspect of the present application, the present application provides a blade clamp mechanism 100, which is applied to the blade 200 of a rotorcraft, including a mounting seat 10 and a connecting assembly 20. The blade 200 is mounted on the connecting assembly 20, and the connecting assembly 20 is connected to the motor through the mounting seat 10, so that the motor can drive the blade 200 to rotate around the rotation axis of the rotor of the motor to provide lift for the rotorcraft.

[0056] It should be noted that during flight, blades 200 rotate about the motor rotor's axis of rotation in a rotation plane. For example, the rotation plane of blades 200 is perpendicular to the rotorcraft's yaw axis. As blades 200 rotate in the rotation plane, they move relative to the air; therefore, the surface of blades 200 experiences periodic headwind and tailwind airflow.

[0057] Among them, when the blade 200 rotates to the windward position, the air flow velocity relative to the blade 200 increases, and the lift of the blade 200 at this time will increase; when the blade 200 rotates to the downwind position, the air flow velocity relative to the blade 200 decreases, and the lift of the blade 200 at this time will decrease. If the blade 200 and the blade clamp mechanism 100 are rigidly connected, it will restrict the up and down swinging of the blade 200. On the one hand, the uneven lift will cause the blade 200 to produce strong distortion, which will not only accelerate the fatigue of the blade 200 material, but also easily cause vibration. At the same time, the alternating torque generated by the blade 200 will be transmitted to the arm of the rotorcraft, causing vibration and damage to the end of the arm; on the other hand, the uneven lift on both sides of the rotor will cause the body of the rotorcraft to lose balance and roll to one side, resulting in an instability accident. It should be noted that the swing in the embodiment of the present application can also be understood as waving in some cases.

[0058] In an optional embodiment, the connecting assembly 20 is rotatably connected to the mounting base 10 to form a swingable connecting assembly 20 whose rotation axis 02 is roughly parallel to the rotation plane, so that the blade 200 can rotate around the rotation axis 02 and swing up and down relative to the rotation plane, thereby unloading the uneven lift, improving the lift imbalance between the forward blade 200 and the backward blade 200 when the rotorcraft is flying at high speed, effectively reducing instability during flight, and thus improving the working reliability of the rotorcraft body and load.

[0059] Among them, when the rotorcraft performs operations such as high-speed forward flight, as the blades 200 rotate to different directions and angles, there will always be a part of the blades 200 whose rotation speed is in the same direction as the forward flight speed of the rotorcraft. This part of the blades 200 is the forward blade 200, and the blade 200 opposite to the forward blade 200 and located on the other side, so its rotation speed direction is opposite to the forward flight speed of the rotorcraft, and this part of the blades 200 is the backward blade 200.

[0060] In an optional embodiment, if Figures 2 to 5 As shown, the mounting base 10 includes a mounting body 11, which is used to connect to the motor. The motor is used to drive the blades 200 to rotate around the rotation axis O1 of the motor's rotor. The rotation axis O1 of the rotor is not parallel to the rotation axis O2 of the connecting assembly 20, so that the blades 200 can swing up and down relative to the rotation plane, thereby unloading the uneven lift, thereby improving the lift imbalance between the forward blades 200 and the backward blades 200 of the rotorcraft when flying at high speed, effectively reducing vibration during flight, and thus improving the working reliability of the rotorcraft body and load.

[0061] In an optional embodiment, the connecting assembly 20 includes a connecting body 21, which is used to install the blade 200; wherein, one of the mounting seat 10 and the connecting assembly 20 includes a mounting hole 12, and the other includes a swing shaft 22, and the swing shaft 22 cooperates with the mounting hole 12 to movably connect the connecting body 21 to the mounting body 11, so that the blade 200 can swing around the axis of the swing shaft 22, reducing the alternating load caused by lift imbalance, improving the flight quality and control performance of the rotorcraft, and improving the working reliability of the load.

[0062] In an optional embodiment, the rotation axis O2 of the swing shaft 22 is not parallel to the rotation axis O1 of the motor's rotor. This non-parallelism ensures that a force or force component exists in a direction perpendicular to the rotation axis O1 of the motor's rotor, thereby driving the blade 200 to move in a direction perpendicular to the rotation axis O1 of the motor's rotor. The non-parallelism of the rotation axis O2 of the swing shaft 22 and the rotation axis O1 of the motor's rotor, including but not limited to the rotation axis O2 of the swing shaft 22 being perpendicular to the rotation axis O1 of the rotor, enables the blade 200 to rotate about the rotation axis O1 of the rotor under the drive of the motor. It also enables the connection body 21 to adaptively adjust its rotation about the rotation axis O2 of the swing shaft 22 relative to the mounting base 10 according to the flight state of the rotorcraft, thereby driving the blade 200 to swing up and down. This prevents the rotorcraft from losing balance and rolling to one side, resulting in an instability accident, and at the same time prevents or transfers the generated alternating loads to the rotorcraft's arms, causing vibration and damage to the arms.

[0063] In an optional embodiment, a sliding bearing 23 is provided on the outer surface of the swing shaft 22, and the sliding bearing 23 is at least partially located between the outer surface of the swing shaft 22 and the inner surface of the mounting hole 12, so that the sliding bearing 23 and the swing shaft 22 are in line contact or surface contact, so that the contact area between the swing shaft 22 and the connecting body 21 can be increased by the sliding bearing 23.

[0064] Compared to ball bearings in related art, when subjected to the same load, sliding bearings 23, on the one hand, have a larger contact area, making the load more easily released and transferred. On the other hand, sliding bearings 23 do not suffer from the load concentration effect caused by point contact between the ball and the raceway. This significantly reduces the load on the sliding bearing 23, prevents wear, deformation, or damage to the sliding bearing 23, and improves the service life of the blade clamp mechanism 100. Furthermore, ball bearings require a preload during installation to eliminate play and reduce noise and vibration during operation, making installation complex. Damage to the ball bearings requires the entire blade clamp mechanism to be replaced. Sliding bearings 23, on the other hand, are easier to install, and if damaged, only the sliding bearings need to be replaced, reducing maintenance costs. It should be noted that the loads on the bearings include the torque caused by the blades rotating in the plane of rotation, the partial alternating torque caused by uneven blade lift, and / or the impact force on the bearings caused by blade swinging.

[0065] In the embodiment of the present application, at least part of the structure of the sliding bearing 23 is arranged between the outer surface of the swing shaft 22 and the inner surface of the mounting hole 12. On the one hand, it can reduce the friction generated by the relative rotation between the swing shaft 22 and the mounting hole 12, thereby improving the rotation accuracy of the swing shaft; on the other hand, it is also beneficial to the transfer of load between the sliding bearing 23, the swing shaft 22 and the mounting hole 12, thereby alleviating the damage caused by the load concentration of a single component.

[0066] In an optional embodiment, if Figures 3 to 6 As shown, the mounting body 11 is formed with a swing groove 114, and the connecting body 21 is movably mounted in the swing groove 114 via the swing shaft 22. The swing groove 114 has shaft holes 112 formed on two opposing side walls, and both ends of the swing shaft 22 are fixed in the shaft holes 112. The sliding bearing 23 is sleeved on the outer surface of the swing shaft 22.

[0067] In an optional embodiment, if Figure 3 、 Figure 4 、 Figure 5 and Figure 7As shown, the sliding bearing 23 includes a main body 231 and a flange 232. The flange 232 is arranged at one end of the main body 231 and extends radially outward along the swing shaft 22, allowing the main body 231 to fill the gap between the swing shaft 22 and the mounting hole 12. The flange 232 is used to absorb loads through deformation when the connecting body 21 swings relative to the swing shaft 22. While ensuring the mobility of the connecting body 21, the flange 232 can be used as a load-relieving component, greatly alleviating the load borne by the sliding bearing. The flange 232 fills the gap between the mounting body 11 and the connecting body 21, forming an axially continuous load transfer channel, which facilitates the transfer and release of loads in the axial direction of the swing shaft 22.

[0068] In an optional embodiment, the flange portion 232 includes at least two stacked first flange pieces, and a first elastomer 233 is filled between two adjacent first flange pieces. This arrangement, on the one hand, is used to transfer the load from the first flange piece to the first elastomer 233, and absorb the load borne by the bearing through the deformation of the first elastomer 233 to avoid overload damage; on the other hand, it can ensure the damping performance during relative swing between the mounting body 11 and the connecting body 21. While unloading the alternating load of the blade 200 through the swing of the blade 200, the first elastomer 233 can also synchronously absorb part of the alternating load.

[0069] Illustratively, the two first flanges are a first inner flange 2321 and a first outer flange 2322. The first inner flange 2321 is connected to the main body 231, and the first elastic body 233 is disposed between the first inner flange 2321 and the first outer flange 2322, forming a sandwich-like structure. After the sliding bearing 23 is installed, the first inner flange 2321 abuts against one side of the connecting body 21, while the first outer flange 2322 abuts against one side of the mounting body 11.

[0070] Exemplarily, the first inner edge piece 2321 and the first outer edge piece 2322 have a receiving groove, and the shape of the receiving groove is adapted to the shape of the first elastic body 233 to prevent the first elastic body 233 from falling out.

[0071] In an optional embodiment, the first flange piece is made of rubber or plastic, which is less expensive than metal, has better load absorption performance, and can effectively reduce weight, thereby helping to reduce the load during flight. For example, the first flange piece is made of POM (polyoxymethylene).

[0072] In an optional embodiment, the first elastic body 233 is made of rubber or plastic, which is less expensive than metal, has better load absorption performance, and can effectively reduce weight, thereby helping to reduce the load during flight. For example, the first elastic body 233 is made of PU (polyurethane).

[0073] In an optional embodiment, the elastic modulus of the first elastic body 233 is smaller than that of the first flange piece, and the first elastic body 233 has better deformation ability than the first flange piece and a stronger load absorption ability.

[0074] In an optional embodiment, the thickness of the flange portion 232 is not less than the gap between the connecting body 21 and the mounting body 11 in the axial direction of the swing shaft 22, and is used to fill the gap between the connecting body 21 and the mounting body 11 to form a stress release channel, thereby solving the problem that stress cannot be transmitted due to the gap between the connecting body 21 and the mounting body 11.

[0075] In an optional embodiment, an interference fit is adopted between the flange portion 232 and the connecting body 21 and the mounting body 11 to ensure that the stress between the connecting body 21 and the mounting body 11 can be effectively transmitted, thereby avoiding the inability to transmit stress due to the existence of a gap between the connecting body 21 and the mounting body 11.

[0076] In an optional embodiment, the sliding bearing 23 includes a first sliding bearing 23a and a second sliding bearing 23b, and the first sliding bearing 23a and the second sliding bearing 23b are arranged at opposite ends of the mounting hole 12 along the axial direction of the swing shaft 22 so as to be able to fill between the outer surface and the inner surface of the swing shaft 22 and the mounting hole 12 at both ends, ensuring that the stress between the connecting body 21 and the mounting body 11 can be effectively transmitted.

[0077] In an optional embodiment, the first and second sliding bearings 23a, 23b are connected at adjacent end surfaces, so that the inner surface of the mounting hole 12 is substantially filled by the first and second sliding bearings 23a, 23b. This allows the first and second sliding bearings 23a, 23b to maintain uniform deformation during stress transfer, thereby effectively transferring stress between the first and second sliding bearings 23a, 23b and avoiding uneven or nonlinear stress transfer caused by localized deformation of the first and second sliding bearings 23a, 23b. Furthermore, the entire inner surface of the mounting hole 12 is substantially the contact surface of the sliding bearings, increasing the effective area for load transfer and facilitating the elimination of load concentration effects.

[0078] In an optional embodiment, the first sliding bearing 23a and the second sliding bearing 23b can basically cover the inner surface of the mounting hole 12, so that the outer surface of the swing shaft 22 and the inner surface of the mounting hole 12 can be covered by the first sliding bearing 23a and the second sliding bearing 23b, and the effective area of ​​load transfer is increased, so that the stress of the first sliding bearing 23a and the second sliding bearing 23b can be effectively transferred and released.

[0079] In an optional embodiment, if Figure 3 、 Figure 5 、 Figure 6 and Figure 8 As shown, a first protrusion 111 extends upward from the bottom of the mounting body 11, and a second protrusion 211 extends downward from the bottom of the connecting body 21. The first protrusion 111 and the second protrusion 211 abut against each other to limit the connecting body 21 and prevent the blade 200 from swinging without restriction.

[0080] Illustratively, the first protrusion 111 and the second protrusion 211 abut against each other through their respective side surfaces to prevent the connecting body 21 from continuing to swing downward, thereby controlling the swing amplitude of the connecting body 21 and thus achieving position limiting of the connecting body 21.

[0081] The side limit in the embodiment of the present application has many effects compared to the lower limit between the bottom of the mounting body 11 and the bottom of the connecting body 21, for example, including: first, compared with the lower limit, at the limit position, the blade 200 is farther away from other components below the blade (such as the motor, the machine arm, etc.), thereby avoiding the interference of the blade 200 with other components below; second, when the connecting body 21 swings to the limit position, an impact force is generated. Under the same impact force, the side limit has a shorter force arm than the lower limit. Therefore, the torque borne by the side limit is also smaller than that of the lower limit, thereby avoiding impact damage to the connecting body 21 and the mounting body 11 (such as Figure 10 and Figure 11 thirdly, the first protrusion 111 and the second protrusion 211 can be regarded as "reinforcement ribs", which can play the role of structural reinforcement while limiting the position, so that the other surfaces of the mounting body 11 can be designed to be thinner, which is conducive to the miniaturization of the mounting body 11.

[0082] It can be understood that the blades 200 are allowed to swing up and down within a certain range in the swing groove 114 under the drive of the connecting body 21. When the blades 200 are working, the forward blades 200 have a large lift force and thus swing upward around the swing axis 22, while the backward blades 200 have a small lift force and thus swing downward around the swing axis 22, thereby eliminating the bending moment at the root of the blades 200 and reducing vibration.

[0083] In an optional embodiment, at least one of the first protrusion 111 and the second protrusion 211 has an elastic structure 30 at the abutment point. For example, the elastic structure 30 is coated on at least one of the first protrusion 111 and the second protrusion 211. With this arrangement, when the connecting body 21 swings around the swing axis 22 relative to the mounting body 11, the elastic structure 30 can reduce the impact force when the connecting body 21 swings to the limit position, effectively protecting the first protrusion 111 and the second protrusion 211.

[0084] In an optional embodiment, the number of elastic structures 30 is two, the second protrusion 211 includes a first side protrusion 2111 and a second side protrusion 2112, the first side protrusion 2111 and the second side protrusion 2112 are respectively arranged on both sides of the bottom of the connecting body 21, and the first protrusion 111 is arranged in the middle of the installing body 11, so that the first side protrusion 2111 and the second side protrusion 2112 can form a limiting structure with the first protrusion 111, which is used to limit the swing range of the connecting body 21 relative to the installing body 11.

[0085] In an optional embodiment, if Figure 3 、 Figure 5 、 Figure 6 and Figure 8 As shown, the connecting assembly 20 includes a mounting hole 12, and the mounting seat 10 includes a swing shaft 22. The mounting hole 12 is shaped on the connecting body 21, and the swing shaft 22 is fixed on the mounting body 11, so that the connecting body 21 can be movably mounted on the mounting seat 10 through the cooperation between the mounting hole 12 and the swing shaft 22.

[0086] In an optional embodiment, the connecting body 21 is arranged axially symmetrically with respect to the mounting hole 12 and / or the swing axis 22 to ensure that the blades 200 on both sides of the connecting body 21 can form a symmetrical aerodynamic layout.

[0087] In an optional embodiment, swing shaft 22 is substantially perpendicular to the rotational axis of the motor's rotor, allowing blades 200 to swing about an axis perpendicular to the motor's rotor's rotational axis. This allows for compensation for lift variations, improving the lift imbalance between the forward and backward blades 200 during high-speed flight of the rotorcraft, effectively reducing vibration during flight, and thereby improving the operational reliability of the rotorcraft and its load. For example, the motor's rotor's rotational axis is in the direction of the rotorcraft's yaw axis, and the swing axis of swing shaft 22 is in the direction of the rotorcraft's roll axis.

[0088] like Figure 1 and Figure 9As shown, according to the second aspect of the present application, the present application provides a propeller structure, including the above-mentioned propeller clamp mechanism and a blade 200, the blade 200 is installed on the connecting body 21 through the mounting shaft 300, so that the motor can drive the blade 200 to rotate through the propeller clamp mechanism, thereby allowing the blade 200 to rotate and push the airflow to generate lift, so as to realize the flight of the rotorcraft.

[0089] Exemplarily, the blade 200 includes a first blade 200a and a second blade 200b, and a first mounting groove 212 and a second mounting groove 213 are respectively formed at both ends of the connecting body 21. The first mounting groove 212 and the second mounting groove 213 are symmetrically arranged relative to the mounting hole 12 and / or the swing axis 22. The first blade 200a and the second blade 200b are respectively rotatably installed in the first mounting groove 212 and the second mounting groove 213 through the mounting shaft 300.

[0090] In an optional embodiment, a buffer structure 400 is provided on at least one end of the mounting shaft 300 close to the connecting body 21. The buffer structure 400 includes at least two stacked second flange pieces 401, and a second elastomer 402 is filled between two adjacent second flange pieces 401 so that stress can be absorbed by the deformation of the second elastomer 402 to avoid the stress being transferred to the connecting body 21 and the blade 200.

[0091] In one optional embodiment, the elastic modulus of the second elastic body 402 is smaller than that of the second flange 401, making the stress absorption capability of the second elastic body 402 stronger than that of the second flange 401. This significantly mitigates the stress-strain hysteresis effect of the second flange 401 and prevents the stress absorption capability of the second flange 401 from failing. A smaller elastic modulus indicates better deformation performance and greater stress absorption capability.

[0092] It should be noted that the material of the first elastic body 233 and the material of the second elastic body 402 can be the same or different, and the material of the first flange piece and the material of the second flange piece 401 can be the same or different.

[0093] It should be noted that the paddle clamp mechanism of the embodiment of the present application has the same technical effect as the paddle clamp mechanism in the above embodiments, and will not be described in detail here. For parts not mentioned in the embodiment of the present application, please refer to the relevant introduction of the above embodiments, and will not be described in detail here.

[0094] like Figure 1 and Figure 9 As shown, according to the third aspect of the present application, the present application provides a rotorcraft comprising the above-mentioned propeller structure.

[0095] It should be noted that the paddle structure of the embodiment of the present application has the same technical effect as the paddle structure in the above embodiments, and will not be described in detail here. For parts not mentioned in the embodiment of the present application, please refer to the relevant introduction of the above embodiments, and will not be described in detail here.

[0096] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections. They can refer to mechanical connections or electrical connections. They can refer to direct connections or indirect connections through an intermediary. They can refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0097] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0098] The disclosure above provides many different embodiments or examples for realizing the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0099] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. A paddle clamp mechanism, characterized in that: The blade clamp mechanism is applied to a blade of a rotorcraft and includes: a mounting base, the mounting base including a mounting body, the mounting body being configured to be connected to a motor, the motor being configured to drive the blade to rotate around a rotation axis of a rotor of the motor; and A connecting assembly, the connecting assembly comprising a connecting body, the connecting body being used to mount the blade; One of the mounting seat and the connecting assembly includes a mounting hole, and the other includes a swing shaft, wherein the swing shaft is not parallel to the rotation axis of the rotor of the motor; the swing shaft cooperates with the mounting hole to movably connect the connecting body to the mounting body, so that the blade can swing around the axis of the swing shaft; The outer surface of the swing shaft is sleeved with a sliding bearing, and the sliding bearing is at least partially located between the outer surface of the swing shaft and the inner surface of the mounting hole.

2. The paddle clamp mechanism according to claim 1, characterized in that: The sliding bearing includes a main body portion and a flange portion arranged at one end of the main body portion and extending outward in the radial direction of the swing shaft.

3. The paddle clamp mechanism according to claim 2, characterized in that: The flange portion includes at least two stacked first flange pieces, and a first elastomer is filled between two adjacent first flange pieces.

4. The paddle clamp mechanism according to claim 3, characterized in that: The elastic modulus of the first elastic body is smaller than the elastic modulus of the first flange piece.

5. The paddle clamp mechanism according to claim 4, characterized in that: The first flange piece is made of rubber or plastic; and / or the first elastic body is made of rubber or plastic.

6. The paddle clamp mechanism according to claim 3, characterized in that: The thickness of the flange portion is not less than a gap between the connecting body and the mounting body in the axial direction of the swing shaft.

7. The paddle clamp mechanism according to claim 6, characterized in that: The flange portion is interference-fitted with the connecting body and the mounting body.

8. The paddle clamp mechanism according to claim 1, wherein: The sliding bearing includes a first sliding bearing and a second sliding bearing, and the first sliding bearing and the second sliding bearing are arranged at opposite ends of the mounting hole along the axial direction of the swing shaft.

9. The paddle clamp mechanism according to claim 8, characterized in that: The first sliding bearing and the second sliding bearing are connected at end faces close to each other; and / or, The first sliding bearing and the second sliding bearing are capable of substantially covering an inner surface of the mounting hole.

10. The paddle clamp mechanism according to claim 9, characterized in that: A first protrusion extends upward from the bottom of the mounting body, and a second protrusion extends downward from the bottom of the connecting body. The first protrusion and the second protrusion abut against each other to limit the connecting body.

11. The paddle clamp mechanism according to claim 10, wherein: The first protrusion and the second protrusion are in contact with each other through their respective side surfaces.

12. The paddle clamp mechanism according to claim 10, wherein: At least one of the first protrusion and the second protrusion has an elastic structure at an abutment portion.

13. The paddle clamp mechanism according to claim 1, wherein: The connecting assembly includes the mounting hole, and the mounting seat includes the swing shaft.

14. The paddle clamp mechanism according to claim 1, wherein: The connecting body is arranged in an axisymmetric manner relative to the mounting hole and / or the swing axis.

15. The paddle clamp mechanism according to claim 1, wherein: The swing axis is substantially perpendicular to the rotation axis of the rotor of the motor.

16. A paddle structure, characterized in that: It comprises the paddle clamp mechanism according to any one of claims 1 to 15 and the paddle blade, wherein the paddle blade is mounted on the connecting body via a mounting shaft.

17. The paddle structure according to claim 16, characterized in that: A buffer structure is sleeved on at least one end of the installation shaft close to the connection body. The buffer structure includes at least two second flange pieces stacked together, and a second elastomer is filled between two adjacent second flange pieces.

18. The paddle structure according to claim 17, characterized in that: The elastic modulus of the second elastic body is smaller than the elastic modulus of the second flange piece.

19. A rotary-wing aircraft, characterized in that: Comprising the paddle structure according to any one of claims 16 to 18.

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