Propeller autorotation mechanism of coaxial unmanned aerial vehicle

Abstract

The utility model relates to the technical field of unmanned aerial vehicles, and discloses a propeller autorotation mechanism of a coaxial unmanned aerial vehicle, which comprises a central bearing seat, a swash plate connecting pull rod, a motor seat, an arm bearing sleeve, a detachable propeller hub, a propeller clamp and a propeller blade, a center bearing seat and a machine arm bearing sleeve form an autorotation mechanism of a paddle, the machine arm bearing sleeve is fixed on the center bearing seat through a bearing, center shafts extend out of the two sides of the center bearing seat respectively, two sets of deep groove ball bearings and a set of thrust bearings are assembled at the axis positions of the center shafts, and the machine arm bearing sleeve is connected with the center shafts. The two ends of the center bearing seat are respectively provided with two sets of inner hexagon combination screws, and the two sets of machine arm bearing sleeves are fixedly connected with the swash plate connecting pull rod through the four sets of inner hexagon screws. Compared with the prior art, the anti-loosening screw has the advantages of being simple in structure, firm in fixation after installation, reliable in strength, small in vibration and reverse force borne by the screw, low in loosening probability and good in anti-loosening performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to unmanned plane technical field, concretely points to a kind of propeller self-rotating mechanism of coaxial unmanned plane. BACKGROUND

[0002] Traditional helicopter is single-rotor helicopter, all rotors are rotated along a rotating direction, so that the helicopter will be affected by rotor counter torque and spin, so tail rotor is needed to offset counter torque, realize heading stability and deflection.Coaxial dual-rotor helicopter compared, because the rotating direction of upper and lower rotors is different, the generated rotation moment can be freely adjusted, the counter torque of two groups of rotors is mutually offset, so that spinning does not occur, because tail rotor is not needed, so that the horizontal direction size of helicopter is greatly reduced, generally fuselage is a cylindrical shape.

[0003] The rotor self-rotation part of traditional single-rotor helicopter is connected and fixed by external flange plate, and there are about 10 evenly distributed bolts on the flange plate, which fix the two parts together.The bolt bears the connection tension and high-frequency vibration when the propeller rotates, and the bolt loosening becomes a key problem, in addition to good loosening function, regular inspection is also needed to prevent loosening due to loosening function failure.

[0004] In view of the above technical problems, the propeller self-rotation mechanism of coaxial unmanned plane is provided. CONTENT OF UTILITY MODEL

[0005] I. Technical problem to be solved

[0006] The technical problem to be solved by the utility model is that the bolt has good loosening function and prevents loosening due to loosening function failure.

[0007] II. Technical scheme

[0008] To solve the above technical problems, the technical scheme provided by the utility model is as follows: a propeller self-rotation mechanism of coaxial unmanned plane, comprising a center bearing seat, an inclined disc connecting pull rod, a motor seat, an arm bearing sleeve, a detachable hub, a paddle clamp and a paddle blade.

[0009] The paddle clamp is fixedly installed on the detachable hub, and the inclined disc connecting pull rod is fixedly installed on the arm bearing sleeve; the connecting rod is pulled to drive the arm bearing sleeve to rotate, and at the same time drive the paddle blade to do overturning motion.

[0010] The center bearing seat and the arm bearing sleeve form a self-rotation mechanism of the propeller, the arm bearing sleeve is fixed on the center bearing seat through a bearing, two center shafts are respectively arranged on the two sides of the center bearing seat, the center of the shaft is provided with two groups of deep groove ball bearings and a group of thrust bearings, the arm bearing sleeve is connected with the center shaft, two groups of inner hexagonal combination screws are respectively arranged at the two ends of the center bearing seat, and the two groups of arm bearing sleeves are fixedly connected with the tilt disc connecting pull rod through four groups of inner hexagonal screws.

[0011] As an improvement, the center bearing seat, the tilt disc connecting pull rod, the motor seat and the arm bearing sleeve are assembled through screws, and the detachable hub, the propeller clamp and the propeller are assembled through screws.

[0012] As an improvement, the inner hexagonal combination screw can be one of M2.5*8 screws, M2*8 screws and M3*8 screws, and is provided with a flat gasket and an elastic gasket.

[0013] As an improvement, the center bearing seat is made of hard metal material, and can be made of stainless steel, titanium alloy and other materials.

[0014] III. Advantages

[0015] Compared with the prior art, the utility model has the advantages of simple structure, firm fixing after installation, reliable strength, small vibration and reverse force borne by the screw, low screw loosening probability and excellent screw anti-loosening performance. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional view of a rotor group of a coaxial unmanned aerial vehicle helical propeller self-rotation mechanism.

[0017] Figure 2 It is a cross-sectional structure schematic view of a coaxial unmanned aerial vehicle helical propeller self-rotation mechanism.

[0018] As shown in the figure: 1, center bearing seat; 2, tilt disc connecting pull rod; 3, motor seat; 4, arm bearing sleeve; 5, detachable hub; 6, propeller clamp; 7, propeller; 8, deep groove ball bearing; 9, thrust bearing; 10, inner hexagonal combination screw. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments; based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0020] As shown in the figure: Figure 1As shown in the figure, a kind of coaxial unmanned aerial vehicle propeller autorotation mechanism, characterized in that: comprising center bearing seat 1, tilt plate connecting pull rod 2, motor seat 3, arm bearing sleeve 4, detachable hub 5, paddle clamp 6 and paddle 7;

[0021] Paddle clamp 6 is fixedly installed on detachable hub 5, tilt plate connecting pull rod 2 is fixedly installed on arm bearing sleeve 4, pull connecting rod drives arm bearing sleeve to rotate, and simultaneously drives paddle 7 to do overturning motion, center bearing seat 1, tilt plate connecting pull rod 2, motor seat 3 and arm bearing sleeve 4 are assembled by screw, detachable hub 5, paddle clamp 6 and paddle 7 are assembled by screw.

[0022] As shown in the figure, Figure 2 Center bearing seat 1 and arm bearing sleeve 4 constitute the autorotation mechanism of paddle 7, arm bearing sleeve 4 is fixed on center bearing seat 1 through bearing, two center shafts are respectively extended from the two sides of center bearing seat 1, two groups of deep groove ball bearings 8 and a group of thrust bearings 9 are assembled at the axial position of the center shaft, arm bearing sleeve 4 is connected with the center shaft, two groups of inner hexagonal combination screws 10 are respectively installed at the two ends of center bearing seat 1, and two groups of arm bearing sleeves 4 are fixedly connected with tilt plate connecting pull rod 2 through four groups of inner hexagonal screws.

[0023] The inner hexagonal combination screw 10 can be selected from one of M2.5*8 screw, M2*8 screw and M3*8 screw, and is provided with flat gasket and elastic gasket.

[0024] The center bearing seat 1 is made of hard metal material, which can be selected from stainless steel, titanium alloy and other materials.

[0025] Through the above structure, in the autorotation motion of paddle 7, center bearing seat 1 is fixed on the main shaft and is the relatively stationary part of autorotation motion, and other parts rotate around the shaft on the two sides of center bearing seat 1. The rotating parts are supported by two deep groove ball bearings 8 and a thrust bearing 9, the bearing can reduce the friction coefficient of motion and ensure the rotation accuracy. The M2.5*8 combination screw on the two sides fixes the outer deep groove ball bearing 8, the screw is fixed with screw glue, and contacts with the fixed non-rotating part of the bearing. The shaft of the bearing and the center bearing seat 1 is in interference fit, so that the vibration and reverse force borne by the screw is very small, and the loosening probability of the screw is reduced to the minimum. In addition, the center bearing seat 1 is made of hard metal material, which can ensure sufficient rigidity and strength under various flight conditions through static analysis in finite element analysis.

[0026] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0027] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the following claims and their equivalents.

[0028] The above description of the present application and its embodiments has been described, which is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the creative purpose of the present application, without creative design, similar structure and embodiments of the technical scheme should belong to the protection scope of the present application.

Claims

1. A coaxial unmanned aerial vehicle propeller autorotation mechanism, comprising a central bearing seat (1), an inclined disc connecting pull rod (2), a motor seat (3), an arm bearing sleeve (4), a detachable hub (5), a propeller clamp (6) and a propeller blade (7), characterized in that: the propeller clamp (6) is fixedly installed on the detachable hub (5), and the inclined disc connecting pull rod (2) is fixedly installed on the arm bearing sleeve (4); pulling the connecting rod drives the arm bearing sleeve to rotate, and simultaneously drives the propeller blade (7) to make a overturning motion; the central bearing seat (1) and the arm bearing sleeve (4) constitute an autorotation mechanism of the propeller blade (7); the arm bearing sleeve (4) is fixed on the central bearing seat (1) through bearings; the central bearing seat (1) has a central shaft extending from each side thereof; the central shaft has two groups of deep groove ball bearings (8) and one group of thrust bearings (9) assembled at the central shaft position; the arm bearing sleeve (4) is connected with the central shaft; the central bearing seat (1) has two groups of internal hexagonal combination screws (10) installed at both ends thereof; and the two groups of arm bearing sleeves (4) are fixedly connected with the inclined disc connecting pull rod (2) through four groups of internal hexagonal screws.

2. A self-spinning mechanism for the propellers of a coaxial unmanned aerial vehicle according to claim 1, characterized in that: The central bearing seat (1), the inclined disc connecting pull rod (2), the motor seat (3) and the arm bearing sleeve (4) are assembled through screws; and the detachable hub (5), the propeller clamp (6) and the propeller blade (7) are assembled through screws.

3. A self-spinning mechanism for the propellers of a coaxial unmanned aerial vehicle according to claim 2, characterized in that: The internal hexagonal combination screws (10) can be one of M2.5*8 screws, M2*8 screws and M3*8 screws, and are provided with flat washers and elastic washers.

4. A self-spinning mechanism for the propellers of a coaxial unmanned aerial vehicle according to claim 1, characterized in that: The central bearing seat (1) is made of hard metal material, and can be made of stainless steel, titanium alloy or other materials.

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