A fixed anti-loose structure for propeller

Abstract

The utility model provides a kind of for propeller's fixed anti-loose structure, including paddle structure, press paddle, motor assembly and multiple anti-loose fastening mechanism;Press paddle is arranged in the middle part of paddle structure, multiple anti-loose fastening mechanism is evenly distributed on press paddle, paddle structure is connected with the outer rotor shell of motor assembly by anti-loose fastening mechanism;Anti-loose fastening mechanism includes check screw, anti-loose structure and first resin adhesive layer;Check screw includes nut, shaft shoulder and threaded rod, shaft shoulder is arranged in the lower end surface of nut, threaded rod is arranged in the lower end surface of shaft shoulder.The utility model discloses a kind of for propeller's fixed anti-loose structure, solve the limitation that fixed structure in relevant technology exists friction and is easily attenuated and the detachability of thread is damaged, leading to the long-term reliable anti-loose and detachable connection demand under vibration impact environment of check screw is difficult to meet simultaneously.

Description

Technical Field

[0001] This utility model belongs to the field of unmanned aerial vehicle (UAV) technology, and in particular relates to a fixing and anti-loosening structure for propellers. Background Technology

[0002] The fastening of drone propellers is a critical element in ensuring flight safety and performance, and its design and technological development are closely centered around reliability, lightweight design, and efficiency. The propellers are connected to the motor shaft via fasteners, converting motor torque into lift or thrust. Any loosening can lead to power loss, increased vibration, or even loss of control. Drones endure complex loads during maneuvering flight (such as centrifugal force and aerodynamic drag), and fasteners must withstand high-frequency vibrations and impacts. Therefore, the materials used for the fasteners must meet high strength requirements (such as titanium alloys and aerospace-grade aluminum) while being as lightweight as possible to improve endurance and maneuverability.

[0003] Existing anti-loosening screw technologies mainly include friction-based anti-loosening methods such as spring washers and double nuts; mechanical locking methods such as cotter pins and locking washers; and permanent anti-loosening methods such as punching and welding. Among these, friction-based anti-loosening methods are prone to failure under vibration, mechanical locking methods are complex to install and disassemble, and permanent anti-loosening methods compromise removability. Due to limitations in the fixing structures of these technologies, such as easy frictional attenuation and compromised thread removability, it is difficult to simultaneously meet the requirements of long-term reliable anti-loosening and removable connection under vibration and impact environments. Summary of the Invention

[0004] In view of this, the present invention aims to at least partially solve one of the related technical problems.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A fixing and anti-loosening structure for a propeller includes a blade structure, a blade pressure plate, a motor assembly, and multiple anti-loosening fastening mechanisms.

[0007] The pressure plate is disposed in the middle of the blade structure, and a plurality of anti-loosening fastening mechanisms are evenly distributed on the pressure plate. The blade structure is connected to the outer rotor housing of the motor assembly through the anti-loosening fastening mechanisms.

[0008] The anti-loosening fastening mechanism includes an anti-loosening screw, an anti-loosening structure, and a first resin adhesive layer;

[0009] The anti-loosening screw includes a nut, a shoulder, and a threaded rod. The shoulder is located on the lower end face of the nut, and the threaded rod is located on the lower end face of the shoulder.

[0010] The lower end face of the nut is provided with a plurality of anti-loosening grooves evenly arranged around the circumference. The plurality of anti-loosening grooves are used to fill the first resin adhesive layer. After the first resin adhesive layer is cured, it forms a raised limiting structure embedded in the anti-loosening grooves and is bonded to the upper surface of the pressure plate.

[0011] The shoulder is connected to the pressure plate via an anti-loosening structure.

[0012] Furthermore, the anti-loosening structure includes a pre-tightening anti-loosening component, a bushing, a toothed anti-loosening component, and an adhesive cavity structure;

[0013] The bonding cavity structure is disposed on the upper end face of the flange flange of the bushing, and the bonding cavity structure is directly opposite the anti-loosening groove;

[0014] The toothed anti-loosening component is disposed on the outer wall of the bushing cylinder, the pressure plate is provided with a through hole that can cooperate with the shaft shoulder, and the inner wall of the through hole is provided with a through groove that cooperates with the toothed anti-loosening component.

[0015] The pre-tightening and anti-loosening component is fitted onto the bottom of the flange flange of the bushing.

[0016] The toothed anti-loosening component is disposed on the outer wall of the bushing cylinder, the pressure plate is provided with a through hole that can cooperate with the shaft shoulder, and the inner wall of the through hole is provided with a through groove that cooperates with the toothed anti-loosening component.

[0017] The pre-tightening and anti-loosening component is fitted onto the bottom of the flange flange of the bushing.

[0018] Furthermore, the pre-tightening and anti-loosening assembly includes a spring washer, a ratchet structure, and a second resin adhesive layer. The spring washer is sleeved on the bottom of the flange edge of the bushing, the ratchet structure is disposed on the lower end face of the flange edge of the bushing, and the second resin adhesive layer is disposed between the spring washer and the ratchet structure. The flange edge of the bushing is provided with multiple glue injection holes, and each glue injection hole is connected to the second resin adhesive layer.

[0019] Furthermore, the bonding cavity structure includes multiple conical cavities, which are evenly arranged circumferentially on the flange edge of the bushing, and each conical cavity is directly opposite an anti-loosening groove.

[0020] Furthermore, the toothed anti-loosening component includes multiple toothed protrusions, which are evenly arranged circumferentially on the outer wall of the bushing.

[0021] Furthermore, the number of anti-loosening fastening mechanisms is four.

[0022] Compared with the prior art, the propeller fixing and anti-loosening structure of this utility model has the following advantages:

[0023] 1. A chemical adhesive layer is formed on the contact surface between the nut and the pressure plate using a resin adhesive layer. The material interface bonding force directly inhibits the screw rotation tendency. At the same time, the raised limiting structure formed by the cured resin embedded in the anti-loosening groove constitutes a mechanical interlocking barrier, which fundamentally solves the problem of physical attenuation of traditional friction anti-loosening.

[0024] 2. The meshing of the toothed protrusions of the bushing and the through groove of the pressure plate forms a rigid blockage in the direction of rotation, while the corresponding design of the conical cavity and the groove allows the resin to form a through anchor pile structure during the curing process. The dual mechanical constraints and the resin adhesive layer form a three-dimensional anti-loosening network. Even under continuous high-frequency vibration, if any anti-loosening unit fails, the other mechanisms can still provide compensating locking force.

[0025] 3. Compared with permanent anti-loosening methods such as welding or riveting, this mechanism, through the controllable curing of the resin layer and the design of the toothed meshing structure, ensures the reliability of anti-loosening while allowing non-destructive disassembly by breaking the resin layer with special tools. It solves the industry contradiction between the weak anti-loosening ability of traditional detachable structures and the lack of maintenance of permanent anti-loosening, and is especially suitable for aerospace power systems that require frequent maintenance. Attached Figure Description

[0026] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0027] Figure 1 This is a schematic diagram of a propeller fixing and anti-loosening structure according to an embodiment of the present utility model;

[0028] Figure 2 This is a cross-sectional view of the fixing and anti-loosening structure described in an embodiment of this utility model;

[0029] Figure 3 This is a side view of the anti-loosening screw described in an embodiment of the present utility model;

[0030] Figure 4 This is a bottom view of the anti-loosening screw described in an embodiment of this utility model;

[0031] Figure 5 This is a top view of the anti-loosening screw described in an embodiment of the present utility model;

[0032] Figure 6 This is a schematic diagram of the anti-loosening structure described in an embodiment of the present utility model;

[0033] Figure 7 This is a schematic diagram of the spring washer and toothed protrusion described in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Anti-loosening screw; 2. Pressure plate; 3. Motor assembly; 4. First resin adhesive layer; 5. Propeller blade structure; 6. Nut; 7. Anti-loosening groove; 8. Shoulder; 80. Anti-loosening structure; 81. Flange retainer of bushing; 82. Conical cavity; 83. Glue injection hole; 84. Spring washer; 85. Toothed protrusion; 9. Threaded rod; 10. Anti-loosening fastening mechanism. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] 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 fixed 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.

[0039] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] A fixing and anti-loosening structure for propellers, such as Figure 1 As shown, it includes a blade structure 5, a pressure plate 2, a motor assembly 3, and multiple anti-loosening fastening mechanisms 10; the pressure plate 2 is located in the middle of the blade structure 5, and multiple anti-loosening fastening mechanisms 10 are evenly distributed on the pressure plate 2; the blade structure 5 is connected to the outer rotor housing of the motor assembly 3 through the anti-loosening fastening mechanisms 10.

[0041] The anti-loosening fastening mechanism 10 includes an anti-loosening screw 1, an anti-loosening structure 80, and a first resin adhesive layer 4. The anti-loosening screw 1 includes a nut 6, a shoulder 8, and a threaded rod 9. The shoulder 8 is located on the lower end face of the nut 6, and the threaded rod 9 is located on the lower end face of the shoulder 8. Multiple anti-loosening grooves 7 are evenly arranged around the lower end face of the nut 6. The multiple anti-loosening grooves 7 are used to fill the first resin adhesive layer 4. After the first resin adhesive layer 4 is cured, it forms a raised limiting structure embedded in the anti-loosening groove 7 and is bonded to the upper surface of the pressure plate 2. The shoulder 8 is connected to the pressure plate 2 through the anti-loosening structure 80. There are 4 anti-loosening fastening mechanisms 10. By using the resin adhesive layer to form a chemical adhesive layer on the contact surface between the nut 6 and the pressure plate 2, the screw rotation tendency is directly suppressed by the material interface bonding force. At the same time, the raised limiting structure formed by the cured resin embedded in the anti-loosening groove 7 constitutes a mechanical interlocking barrier, which fundamentally solves the problem of physical attenuation of traditional friction anti-loosening.

[0042] The anti-loosening structure 80 includes a pre-tightening anti-loosening component, a bushing, a toothed anti-loosening component, and an adhesive cavity structure. The adhesive cavity structure is located on the upper end face of the flange flange 81 of the bushing, and is directly opposite the anti-loosening groove 7. The toothed anti-loosening component is located on the outer wall of the bushing cylinder, and the pressure plate 2 has a through hole that can mate with the shoulder 8. The inner wall of the through hole has a through groove that mates with the toothed anti-loosening component. The pre-tightening anti-loosening component is sleeved on the bottom of the flange flange 81 of the bushing. The toothed anti-loosening component is located on the outer wall of the bushing cylinder, and the pressure plate has a through hole that can mate with the shoulder. The inner wall of the through hole has a through groove that mates with the toothed anti-loosening component.

[0043] The pre-tightening anti-loosening component is fitted onto the bottom of the flange edge 81 of the bushing. The component includes a spring washer 84, a ratchet structure, and a second resin adhesive layer. The spring washer 84 is fitted onto the bottom of the flange edge 81 of the bushing, the ratchet structure is located on the lower end face of the flange edge 81, and the second resin adhesive layer is positioned between the spring washer 84 and the ratchet structure. The flange edge 81 of the bushing has multiple injection holes 83, each of which communicates with the second resin adhesive layer. Compared to permanent anti-loosening methods such as welding or riveting, this mechanism, through the controllable curing of the resin layer and the toothed meshing structure design, ensures reliable anti-loosening while allowing for non-destructive disassembly by breaking the resin layer with specialized tools. This resolves the industry contradiction between the weak anti-loosening capability of traditional detachable structures and the lack of maintainability of permanent anti-loosening methods, making it particularly suitable for aerospace power systems requiring frequent maintenance.

[0044] The bonding cavity structure includes multiple conical cavities 82, which are evenly arranged around the flange edge 81 of the bushing. Each conical cavity 82 is directly opposite an anti-loosening groove 7.

[0045] The toothed anti-loosening component includes multiple toothed protrusions 85, which are evenly arranged circumferentially on the outer wall of the bushing. The engagement of the toothed protrusions 85 with the through groove of the pressure plate 2 forms a rigid barrier in the direction of rotation, while the corresponding design of the conical cavity 82 and the groove allows the resin to form a through-type anchor pile structure during the curing process. The dual mechanical constraints and the resin adhesive layer form a three-dimensional anti-loosening network. Even under continuous high-frequency vibration, if any anti-loosening unit fails, the remaining mechanisms can still provide compensating locking force.

[0046] How this example works

[0047] Step 1: Prepare the core components of the anti-loosening fastening mechanism 10, including a titanium alloy anti-loosening screw 1 with circumferentially distributed anti-loosening grooves 7, a bushing flange with a built-in conical cavity 82, a carbon fiber pressure plate 2 with a through groove on its surface, and a pre-mixed resin adhesive. The semi-circular groove on the lower surface of the screw nut 6 is precisely aligned with the conical cavity 82 at the upper end of the bushing flange. At the same time, the toothed protrusion 85 on the outer wall of the bushing cylinder is engaged with the through groove on the inner wall of the through hole of the pressure plate 2 for pre-positioning, ensuring the spatial matching of each mechanical constraint unit.

[0048] Step 2: Simultaneously fill the first resin adhesive into the anti-loosening groove 7 on the lower surface of the screw and nut 6 and the conical cavity 82 of the bushing flange. Utilize the fluidity of the adhesive to completely wet the groove and the internal pores of the cavity. Then, pass the screw shoulder 8 through the through hole of the pressure plate 2. At this time, the bushing toothed protrusion 85 engages with the through groove to lock the circumferential degree of freedom. Vertically tighten the screw to compress the gap between the lower surface of the nut 6 and the upper surface of the pressure plate 2 to the set value. Under pressure, the resin adhesive forms a continuous adhesive film and partially seeps out to fill the micro-gaps at the interface. Let it stand for initial curing to form the protruding limiting post embedded in the groove cavity and the adhesive layer of the nut 6 and the pressure plate 2.

[0049] Step 3: Place the bottom of the bushing flange with spring washer 84 against the housing of motor assembly 3, tighten the screw to make the threaded rod 9 engage with the threaded pair of the motor outer rotor housing. When the preload force transmitted by the shoulder 8 through the spring washer 84 reaches the threshold, the ratchet structure at the lower end of the bushing flange engages with the spring washer 84. Then, inject the second resin adhesive through the injection hole 83 to penetrate into the ratchet engagement tooth gap. After curing, a rigid adhesive lock that resists reverse rotation is formed. Finally, through the four synergistic effects of double resin layer curing and bonding, groove-cavity mechanical interlocking, tooth engagement and ratchet preload, the propeller system achieves permanent anti-loosening with zero backflow under vibration environment.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A fixing and anti-loosening structure for a propeller, characterized in that: It includes a blade structure (5), a pressure blade (2), a motor assembly (3), and multiple anti-loosening fastening mechanisms (10); The pressure plate (2) is disposed in the middle of the blade structure (5), and a plurality of anti-loosening fastening mechanisms (10) are evenly distributed on the pressure plate (2). The blade structure (5) is connected to the outer rotor housing of the motor assembly (3) through the anti-loosening fastening mechanisms (10). The anti-loosening fastening mechanism (10) includes an anti-loosening screw (1), an anti-loosening structure (80), and a first resin adhesive layer (4); the anti-loosening screw (1) includes a nut (6), a shoulder (8), and a threaded rod (9), the shoulder (8) is disposed on the lower end face of the nut (6), and the threaded rod (9) is disposed on the lower end face of the shoulder (8); The nut (6) has a plurality of anti-loosening grooves (7) evenly arranged around its lower end face. The plurality of anti-loosening grooves (7) are used to fill the first resin adhesive layer (4). After the first resin adhesive layer (4) is cured, it forms a protruding limiting structure embedded in the anti-loosening grooves (7) and is bonded to the upper surface of the pressure plate (2). The shoulder (8) is connected to the pressure plate (2) through an anti-loosening structure (80).

2. The fixing and anti-loosening structure according to claim 1, characterized in that: The anti-loosening structure (80) includes a pre-tightening anti-loosening component, a bushing, a toothed anti-loosening component, and an adhesive cavity structure; The adhesive cavity structure is set on the upper end face of the flange flange (81) of the bushing, and the adhesive cavity structure is directly opposite the anti-loosening groove (7); The toothed anti-loosening component is disposed on the outer wall of the bushing cylinder, and the pressure plate (2) is provided with a through hole that can cooperate with the shoulder (8). The inner wall of the through hole is provided with a through groove that cooperates with the toothed anti-loosening component. The pre-tightening and anti-loosening assembly is fitted onto the bottom of the flange flange (81) of the bushing; The toothed anti-loosening component is disposed on the outer wall of the bushing cylinder, the pressure plate is provided with a through hole that can cooperate with the shaft shoulder, and the inner wall of the through hole is provided with a through groove that cooperates with the toothed anti-loosening component. The pre-tightening and anti-loosening component is fitted onto the bottom of the flange flange of the bushing.

3. The fixing and anti-loosening structure according to claim 2, characterized in that: The pre-tightening and anti-loosening assembly includes a spring washer (84), a ratchet structure, and a second resin adhesive layer. The spring washer (84) is sleeved on the bottom of the flange flange (81) of the bushing. The ratchet structure is located on the lower end face of the flange flange (81) of the bushing. The second resin adhesive layer is provided between the spring washer (84) and the ratchet structure. The flange flange (81) of the bushing is provided with a plurality of glue injection holes (83), and each of the glue injection holes (83) is connected to the second resin adhesive layer.

4. The fixing and anti-loosening structure according to claim 2, characterized in that: The bonding cavity structure includes multiple conical cavities (82), which are evenly arranged circumferentially on the flange edge (81) of the bushing, and each conical cavity (82) is directly opposite an anti-loosening groove (7).

5. The fixing and anti-loosening structure according to claim 2, characterized in that: The toothed anti-loosening component includes multiple toothed protrusions (85), which are evenly arranged circumferentially on the outer wall of the bushing.

6. The fixing and anti-loosening structure according to any one of claims 1-5, characterized in that: The number of the anti-loosening fastening mechanisms (10) is 4.

Images