Variable pitch propeller of electric tilt rotor unmanned aerial vehicle

Abstract

The utility model provides a variable pitch propeller of an electric tilt-rotor unmanned aerial vehicle, which belongs to the technical field of unmanned aerial vehicles, and comprises a propeller hub center piece, a propeller assembly, a pull rod assembly, a variable pitch transmission assembly, an execution assembly and a motor body, the output end of the motor body is fixedly connected with the propeller hub center piece, a cavity is formed in the propeller hub center piece and the motor body, the variable-pitch transmission assembly is movably arranged in the cavity, the top end of the variable-pitch transmission assembly is movably connected with the propeller assembly through the pull rod assembly, and the propeller assembly is fixedly connected with the propeller hub center piece. The bottom end of the variable-pitch transmission assembly is movably connected with the execution assembly, a plurality of sets of variable-pitch rotating shafts are arranged on the propeller hub center piece, and the propeller assembly is movably connected with the propeller hub center piece through the variable-pitch rotating shafts. The problems that a variable-pitch structure occupies a large internal space and a transmission mechanism is heavy can be solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to unmanned plane technical field, more particularly, it relates to a kind of electric tilt rotor unmanned plane variable pitch propeller. BACKGROUND

[0002] The core of the propeller variable pitch mechanism is to make the power system of the aircraft have high efficiency in different flight states, thereby saving energy and improving the overall function of the aircraft.

[0003] Currently, the commonly used form of propeller variable pitch mechanism is a variable pitch mechanism driven by a hydraulic cylinder, which is commonly used in large fixed-wing aircraft and helicopters. However, hydraulic drive is limited by its size and weight, which is not convenient for popularization and application in small and medium-sized aircraft, especially in electric aircraft.

[0004] Therefore, in order to increase the take-off and flight efficiency of the unmanned plane, a propeller variable pitch mechanism needs to be designed. In the prior art, a separate variable pitch mechanism is usually used to adjust the pitch angle by contacting the blade through a toothed structure. However, due to the limited space and weight of the unmanned plane, the use of similar variable pitch structure occupies a large internal space and the transmission mechanism is heavy, which reduces the load of the unmanned plane and negatively affects its flight. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides an electric tilt rotor unmanned plane variable pitch propeller, which can solve the problem of large internal space occupied by the variable pitch structure and heavy transmission mechanism.

[0006] The utility model is implemented as follows:

[0007] The utility model provides an electric tilt rotor unmanned plane variable pitch propeller, which can solve the problem of large internal space occupied by the variable pitch structure and heavy transmission mechanism.

[0008] The technical effects of the electric tilt rotor unmanned plane variable pitch propeller provided by the utility model are as follows: the variable pitch transmission assembly is driven by the execution assembly to move along its axis direction, and then the shaft line movement is converted into the rotation of the propeller assembly around its variable pitch rotation axis by the pull rod assembly, thereby realizing the change of the propeller pitch angle.

[0009] On the basis of the above technical scheme, the variable-pitch propeller of the electric tilting rotor unmanned aerial vehicle can be further improved as follows:

[0010] Among them, the hub center piece is provided with a plurality of variable-pitch rotating shafts, and the propeller assembly is movably connected with the hub center piece through the variable-pitch rotating shafts.

[0011] Further, the variable-pitch transmission assembly comprises a traction chuck, a transmission shaft and a puller subassembly, the top end of the transmission shaft is fixedly connected with the traction chuck, and the bottom end of the transmission shaft is movably connected with the puller subassembly.

[0012] The beneficial effects of the above improvement scheme are that: through the design of the traction chuck, the transmission shaft and the puller subassembly in the cavity of the motor body, the transmission structure is more lightweight, and the weight is reduced.

[0013] Further, the bottom end of the transmission shaft is fixedly connected with a fixed ring subassembly, and the outer side of the fixed ring subassembly is provided with a convex shaft.

[0014] The beneficial effects of the above improvement scheme are that: the fixed ring subassembly is used to movably cooperate with the puller subassembly, and the transmission shaft is driven to move through the execution assembly.

[0015] Further, the execution assembly comprises a steering engine and a movable connecting rod, and the output shaft of the steering engine is fixedly connected with one end of the movable connecting rod.

[0016] Further, the other end of the movable connecting rod is movably connected with the puller subassembly.

[0017] Further, the top two sides and one side of the bottom of the puller subassembly are provided with ear convex parts, a connecting through hole is formed in each ear convex part, and the puller subassembly is movably connected with the convex shaft through the connecting through holes in the ear convex parts on the top two sides.

[0018] The beneficial effects of the above improvement scheme are that: the ear convex parts on the top two sides of the puller subassembly are movably connected with the fixed ring subassembly, the ear convex part on the bottom is movably connected with the movable connecting rod, and the transmission effect of the movable connecting rod and the transmission shaft is realized.

[0019] Further, the movable connecting rod is movably connected with the connecting through hole of the ear convex part on the bottom of the puller subassembly through the movable shaft at the end.

[0020] Further, a plurality of mounting grooves are arranged on the traction chuck, and a connecting lug is arranged on the propeller assembly.

[0021] Further, the two ends of the pull rod assembly are movably connected with the mounting grooves on the traction chuck and the connecting lug respectively.

[0022] Compared with the prior art, the crop planting frame has the beneficial effects that: the traction chuck, the transmission shaft and the puller subassembly are designed in the cavity of the motor body, so that the transmission structure is more lightweight and the load is reduced; the variable-pitch transmission assembly moves along the axis direction driven by the execution assembly, and then the axis movement is converted into the rotation of the propeller assembly around the variable-pitch rotation shaft axis through the pull rod assembly, so that the propeller pitch angle is changed; the fixed ring subassembly is arranged to movably cooperate with the puller subassembly, so that the transmission shaft is driven by the execution assembly; the ear convex parts on the top of the puller subassembly are movably connected with the fixed ring subassembly, and the ear convex parts at the bottom are movably connected with the movable connecting rod, so that the transmission effect of the movable connecting rod and the transmission shaft is realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0024] Figure 1 It is a structural schematic diagram of a variable-pitch propeller of an electrically-driven tilting rotor unmanned aerial vehicle.

[0025] Figure 2 It is a schematic diagram of a pull rod assembly.

[0026] Figure 3 It is a schematic diagram of a propeller assembly.

[0027] Figure 4 It is a schematic diagram of a variable-pitch transmission assembly.

[0028] Figure 5 It is a connection schematic diagram of a variable-pitch transmission assembly.

[0029] Figure 6 It is a schematic diagram of a fixed ring subassembly.

[0030] In the drawings, the component list represented by each reference sign is as follows:

[0031] 10, hub center; 11, propeller assembly; 12, pull rod assembly; 13, variable-pitch transmission assembly; 131, traction chuck; 132, transmission shaft; 133, puller subassembly; 14, execution assembly; 141, steering engine; 142, movable connecting rod; 15, motor body; 16, variable-pitch rotation shaft; 17, fixed ring subassembly; 18, convex shaft; 19, ear convex part; 20, guide slider; 21, mounting groove; 22, connecting ear. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] like Figures 1-6 The image shows an embodiment of a variable-pitch propeller for an electric tilt-rotor UAV provided by this utility model. In this embodiment, it includes a hub center component 10, a propeller assembly 11, a tie rod assembly 12, a variable-pitch transmission assembly 13, an execution assembly 14, and a motor body 15. The output end of the motor body 15 is fixedly connected to the hub center component 10. A cavity is formed inside the hub center component 10 and the motor body 15. The variable-pitch transmission assembly 13 is movably disposed inside the cavity. The top end of the variable-pitch transmission assembly 13 is movably connected to the propeller assembly 11 through the tie rod assembly 12, and the bottom end of the variable-pitch transmission assembly 13 is movably connected to the execution assembly 14.

[0034] The bottom of the motor body 15 is provided with a guide slider 20, which is fixedly connected to the housing structure. A limiting groove is formed on the surface of the guide slider 20. The convex shaft 18 of the fixed ring assembly 17 on one side of the guide slider 20 is extended to slide in cooperation with the limiting groove, which helps to stabilize the movement of the transmission shaft 132.

[0035] In use, the servo motor 141 receives a command and drives the movable linkage 142 to rotate, thereby pulling the drive shaft 132 through the fork assembly 133, which works with the traction chuck 131 and the pull rod assembly 12 at the top to convert the axial movement of the drive shaft 132 into the rotation of the propeller assembly 11 around its variable pitch rotation axis 16, thus completing the adjustment of the propeller pitch angle.

[0036] In the above technical solution, the hub center component 10 is provided with multiple sets of variable pitch rotating shafts 16, and the propeller assembly 11 is movably connected to the hub center component 10 through the variable pitch rotating shafts 16.

[0037] Furthermore, in the above technical solution, the variable pitch transmission assembly 13 includes a traction chuck 131, a drive shaft 132, and a shift fork assembly 133. The top end of the drive shaft 132 is fixedly connected to the traction chuck 131, and the bottom end of the drive shaft 132 is movably connected to the shift fork assembly 133.

[0038] The output end of the motor body 15 is fixedly connected to the propeller hub center piece 10, and is used to drive the propeller hub center piece 10 to rotate.

[0039] Furthermore, in the above technical solution, a fixed ring assembly 17 is fixedly connected to the bottom end of the drive shaft 132, and a convex shaft 18 is provided on the outer side of the fixed ring assembly 17.

[0040] Further, in the above technical solution, the execution assembly 14 comprises a steering engine 141 and a movable connecting rod 142, and an output shaft of the steering engine 141 is fixedly connected with one end of the movable connecting rod 142.

[0041] Further, in the above technical solution, the other end of the movable connecting rod 142 is movably connected with the puller assembly 133.

[0042] Further, in the above technical solution, the top two sides and one side of the bottom of the puller assembly 133 are provided with ear protrusions 19, and a connecting through hole is formed in each of the ear protrusions 19, and the puller assembly 133 is movably connected with the protruding shaft 18 through the connecting through holes in the ear protrusions 19 on the top two sides.

[0043] Further, in the above technical solution, the movable connecting rod 142 is movably connected with the connecting through hole of the ear protrusion 19 on the bottom of the puller assembly 133 through an active shaft at the end.

[0044] Further, in the above technical solution, a plurality of mounting grooves 21 are arranged on the traction chuck 131, and a connecting lug 22 is arranged on the propeller assembly 11, and the connecting lug 22 is also provided with a connecting lug 22.

[0045] Further, in the above technical solution, the two ends of the pull rod assembly 12 are movably connected with the corresponding mounting grooves 21 on the traction chuck 131 and the connecting lug 22.

[0046] Specifically, the principle of the utility model is that when in use, the steering engine 141 receives an instruction and drives the movable connecting rod 142 to rotate, so as to pull the transmission shaft 132 through the puller assembly 133, cooperate with the traction chuck 131 and the pull rod assembly 12 at the top end, convert the axial movement of the transmission shaft 132 into the rotation of the propeller assembly 11 around the variable-pitch rotating shaft 16, and then complete the adjustment of the pitch angle of the propeller.

Claims

1. A variable pitch propeller for an electrically powered tilt-rotor drone, characterized by, The utility model provides a variable pitch propeller, including hub center piece (10), propeller assembly (11), pull rod assembly (12), variable pitch transmission assembly (13), execution assembly (14) and motor body (15), the output end of motor body (15) is fixedly connected with hub center piece (10), the hub center piece (10) is set up with the cavity inside motor body (15), variable pitch transmission assembly (13) is movably arranged in the cavity, the top end of variable pitch transmission assembly (13) is movably connected with propeller assembly (11) through pull rod assembly (12), the bottom end of variable pitch transmission assembly (13) is movably connected with execution assembly (14).

2. The variable pitch propeller of claim 1, wherein, A plurality of variable pitch rotating shafts (16) are arranged on the hub center piece (10), and the propeller assembly (11) is movably connected with the hub center piece (10) through the variable pitch rotating shafts (16).

3. The variable pitch propeller of claim 2, wherein, The variable pitch transmission assembly (13) comprises a traction chuck (131), a transmission shaft (132) and a puller assembly (133), the top end of the transmission shaft (132) is fixedly connected with the traction chuck (131), and the bottom end of the transmission shaft (132) is movably connected with the puller assembly (133).

4. The variable pitch propeller of claim 3, wherein, The bottom end of the transmission shaft (132) is fixedly connected with a fixed ring subassembly (17), and the outer side of the fixed ring subassembly (17) is provided with a convex shaft (18).

5. The variable pitch propeller of claim 4, wherein, The execution assembly (14) comprises a steering engine (141) and a movable connecting rod (142), and the output shaft of the steering engine (141) is fixedly connected with one end of the movable connecting rod (142).

6. The variable pitch propeller of claim 5, wherein, The other end of the movable connecting rod (142) is movably connected with the puller assembly (133).

7. The variable pitch propeller of claim 6, wherein, The top sides and one bottom side of the puller assembly (133) are provided with ear convex portions (19), and a connecting through hole is formed in each ear convex portion (19), and the puller assembly (133) is movably connected with the convex shaft (18) through the connecting through holes in the ear convex portions (19) on the top sides.

8. The variable pitch propeller of claim 7, wherein, The movable connecting rod (142) is movably connected with the connecting through holes of the ear convex portions (19) on the bottom side of the puller assembly (133) through movable shafts at the ends.

9. The variable pitch propeller of claim 8, wherein, A plurality of mounting grooves (21) are arranged on the traction chuck (131), and a connecting lug (22) is arranged on the propeller assembly (11), and the connecting lug (22) is also provided with the connecting lug (22).

10. The variable pitch propeller of claim 9, wherein, The two ends of the pull rod assembly (12) are movably connected with the mounting grooves (21) on the traction chuck (131) and the connecting lug (22) respectively.

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