Ground quick-adjustable fixed pitch propeller

Abstract

The application discloses a ground quick adjusting fixed-pitch propeller, which comprises a hub, a sliding block slidingly assembled in the hub, a plurality of blade assemblies assembled on the hub and in transmission connection with the sliding block, and a pitch adjusting mechanism assembled on the hub and used for driving the sliding block to slide up and down to drive the plurality of blade assemblies to be synchronously adjusted. The sliding block is driven by the pitch adjusting mechanism to move up and down in the hub, so that the plurality of blade assemblies in transmission connection with the sliding block are synchronously adjusted. Compared with a common ground adjustable fixed-pitch propeller, the ground quick adjusting fixed-pitch propeller can simultaneously adjust the plurality of blade assemblies, improve the pitch adjusting efficiency, and quickly adjust the plurality of blade assemblies according to the flight environment without disassembling the propeller, so that the operation is simple, convenient and accurate, and is suitable for novices and inexperienced persons to adjust.

Description

Technical Field

[0001] This invention relates to the technical field of variable pitch propellers, specifically to a ground-based, rapidly adjustable fixed-pitch propeller. Background Technology

[0002] Fixed-pitch propellers can adapt to different flight environments and conditions by setting different blade angles. For example, a relatively small blade angle results in better short-distance takeoff and landing performance, while a relatively large blade angle allows for higher aircraft speeds. A medium blade angle offers better overall performance, but none of its advantages are particularly prominent.

[0003] Conventional ground-based adjustable fixed-pitch propellers are notoriously difficult to adjust. Each blade requires a significant amount of time to adjust, and the process demands considerable experience from the operator. Novices and inexperienced operators may struggle with the adjustments, requiring significantly more time, and may even damage blades or other components due to lack of expertise. Therefore, manufacturers typically set a moderate blade angle to achieve relatively balanced flight performance and then leave it unchanged. This results in the aircraft not reaching its optimal performance under specific flight conditions. Therefore, a ground-based, rapidly adjustable fixed-pitch propeller is needed. This propeller should allow for quick blade angle adjustments before flight to meet different flight requirements and achieve optimal aircraft performance. Summary of the Invention

[0004] To address the aforementioned technical problems, the purpose of this invention is to overcome the issues of long blade adjustment time and high skill requirements in the prior art.

[0005] To achieve the above objectives, the present invention provides a ground-based fast-adjustable fixed-pitch propeller, comprising: a propeller hub, a slider slidably mounted inside the propeller hub, several sets of blade assemblies mounted on the propeller hub and all of which are drively connected to the slider, and a pitch adjustment mechanism mounted on the propeller hub for driving the slider to slide up and down to drive the several sets of blade assemblies to adjust synchronously.

[0006] Preferably, the slider includes a slider body and a cover plate assembled to the slider body by a number of second bolts, and the slider body has a number of mounting slots corresponding to a number of sets of blade assemblies on the side near the cover plate.

[0007] Preferably, the blade assembly includes a blade rotatably mounted on a blade hub, a pitch slider slidably mounted in a corresponding mounting slot, and a pitch pin with an off-axis mounted on the blade and slidably inserted into the pitch slider.

[0008] Preferably, the pitch adjustment mechanism includes a pitch guide rod connected to the slider and sliding upward through the propeller hub, and an adjusting nut that is threadedly connected to the upper end of the pitch guide rod and detachably connected to the top of the propeller hub.

[0009] Preferably, the variable-pitch adjusting mechanism further comprises a spring located inside the hub and sleeved on the variable-pitch guide rod, two ends of the spring being in abutment with the top of the sliding block and the inner top of the hub respectively.

[0010] Preferably, the adjusting nut is provided with a plurality of mounting holes arranged at intervals in the circumferential direction, the top of the hub is provided with at least one threaded hole, and at least one first bolt is inserted into the corresponding threaded hole.

[0011] Preferably, the middle part of the sliding block is provided with a mounting through hole, and the outer wall of the variable-pitch guide rod is provided with a mounting portion capable of being fixedly clamped into the mounting through hole.

[0012] Preferably, the upper part of the variable-pitch guide rod is provided with a positioning flange in abutment with the bottom of the sliding block.

[0013] Preferably, the bottom of the sliding block is recessed and provided with a positioning groove for accommodating the positioning flange.

[0014] Preferably, the hub comprises a lower hub and an upper hub fixedly connected to the lower hub by a plurality of third bolts.

[0015] According to the above technical solution, the ground rapid adjustment constant pitch propeller provided by the application has the following beneficial effects in use:

[0016] By driving the sliding block to move up and down inside the hub through the variable-pitch adjusting mechanism, a plurality of groups of blade assemblies in transmission connection with the sliding block can be simultaneously adjusted, compared with the ordinary ground adjustable constant pitch propeller, not only the plurality of groups of blade assemblies can be adjusted at the same time, the efficiency of variable-pitch adjustment is improved, and the plurality of groups of blade assemblies can be quickly adjusted according to the flight environment without disassembling the propeller, which is simple, convenient and accurate, and is suitable for novices and inexperienced persons to adjust.

[0017] Other features and advantages of the application will be described in detail in the following specific embodiments; and the parts not involved in the application are the same as or can be realized by the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, and together with the following specific embodiments, serve to explain the application, but do not constitute a limitation on the application. In the drawings:

[0019] Fig. 1 is a perspective view of a ground rapid adjustment constant pitch propeller provided by the application;

[0020] Fig. 2 is a sectional view of a ground rapid adjustment constant pitch propeller provided by the application;

[0021] Fig. 3 is a local three-dimensional structure schematic diagram of a ground quick-adjusting fixed-pitch propeller provided by the utility model.

[0022] Mark explanation

[0023] 1, hub; 2, sliding block; 3, variable-pitch guide rod; 4, adjusting nut; 5, spring; 6, mounting hole; 7, first bolt; 8, mounting portion; 9, positioning flange; 10, mounting groove; 11, blade; 12, variable-pitch sliding block; 13, variable-pitch pin. Specific implementation

[0024] The specific implementation of the present application is described in detail below in combination with the drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application.

[0025] In the present application, the orientation words contained in the terms such as "up, down, in, out" only represent the orientation of the terms in the conventional use state or the common name understood by those skilled in the art without being regarded as the limitation of the terms, unless otherwise stated.

[0026] As Figs. 1-3 shown, a ground quick-adjusting fixed-pitch propeller comprises a hub 1, a sliding block 2 slidingly assembled inside the hub 1, a plurality of blade assemblies assembled on the hub 1 and in transmission connection with the sliding block 2, and a variable-pitch adjusting mechanism assembled on the hub 1 for driving the sliding block 2 to slide up and down to drive the plurality of blade assemblies to be synchronously adjusted.

[0027] In the above technical solution, when the plurality of blade assemblies need to be adjusted at the same time, the sliding block 2 is driven to move up and down inside the hub 1 by the variable-pitch adjusting mechanism before the unmanned aerial vehicle takes off, so as to drive the plurality of blade assemblies in transmission connection with the sliding block 2 to be synchronously adjusted. Compared with the ordinary ground adjustable fixed-pitch propeller, the plurality of blade assemblies can be adjusted at the same time, the efficiency of variable-pitch adjustment is improved, and the plurality of blade assemblies can be quickly adjusted according to the flight environment without disassembling the propeller, which is simple, convenient and accurate.

[0028] In a preferred embodiment of the present application, the sliding block 2 comprises a sliding block body and a cover plate assembled on the sliding block body by a plurality of second bolts, and a plurality of mounting grooves 10 corresponding to the plurality of blade assemblies are arranged on the side of the sliding block body close to the cover plate.

[0029] In the above technical solution, the sliding block 2 is divided into a sliding block body and a cover plate, which can facilitate the manufacturing and processing of the sliding block body and the cover plate. When assembled, the split sliding block 2 is also conducive to assembly, reducing the difficulty of assembly operation.

[0030] In one preferred embodiment of the invention, the blade assembly comprises a blade 11 rotatably mounted on the hub 1, a pitch slider 12 slidably mounted in the corresponding mounting slot 10, and a pitch pin 13 obliquely mounted on the blade 11 and slidably inserted into the pitch slider 12.

[0031] In the above technical solution, the blade 11 is a mature technology, and only the root of the blade 11 is shown in the figure. When the slider 2 moves up and down in the hub 1, the pitch slider 12 and the pitch pin 13 are driven to move up and down together through the pitch adjustment mechanism. The change in the height of the pitch pin 13 drives the blade 11 to rotate and adjust the angle of the blade 11. When the blade 11 rotates, the pitch slider 12 slides in the mounting slot 10 through the pitch pin 13, and the pitch pin 13 also rotates in the pitch slider 12.

[0032] When the slider 2 moves up and down in the hub 1, the blades 11 in several groups of blade assemblies can be simultaneously rotated, which is efficient and easy to operate.

[0033] In one preferred embodiment of the invention, the pitch adjustment mechanism comprises a pitch guide rod 3 connected to the slider 2 and sliding upwardly out of the hub 1, and an adjustment nut 4 threadedly connected to the upper end of the pitch guide rod 3 and detachably connected to the top of the hub 1.

[0034] In the above technical solution, when the blade assembly needs to be adjusted, the adjustment nut 4 is separated from the top of the hub 1. When the pitch guide rod 3 needs to move upwardly, the adjustment nut 4 is rotated to move downwardly relative to the pitch guide rod 3. Since the adjustment nut 4 is in contact with the top of the hub 1, the pitch guide rod 3 moves upwardly relative to the adjustment nut 4, thereby driving the slider 2 to move upwardly in the hub 1. After the adjustment is completed, the adjustment nut 4 is connected to the hub 1 again.

[0035] When the pitch guide rod 3 needs to move downwardly, the adjustment nut 4 is loosened, and the slider 2 and the pitch guide rod 3 move downwardly due to gravity. The pitch guide rod 3 can also be pressed downwardly, so that the adjustment nut 4 abuts against the top of the hub 1. The downwardly moving pitch guide rod 3 drives the slider 2 to move downwardly in the hub 1, thereby driving several groups of blade assemblies to adjust the angle state. After understanding the specific flight environment, for example, during climbing or downhill racing, the angle of the blade assembly can be adjusted to adapt to the current flight environment.

[0036] When switching between several commonly used states of the blade assembly, the number of rotations of the adjustment nut 4 can be remembered to further improve the adjustment efficiency.

[0037] In a preferred embodiment of the application, the pitch adjusting mechanism further comprises a spring 5 arranged inside the hub 1 and sleeved on the pitch guide rod 3, and the two ends of the spring 5 are in contact with the top of the sliding block 2 and the inner top of the hub 1, respectively.

[0038] In the above technical solution, by arranging the spring 5, the adjusting nut 4 is always in contact with the upper surface of the hub 1, which facilitates the adjustment of the pitch guide rod 3, and the angle change of the blade assembly can be observed in real time.

[0039] The spring 5 exerts a downward force on the pitch guide rod 3 through the sliding block 2. When the adjusting nut 4 is tightened, i.e. the pitch guide rod 3 and the sliding block 2 move upward, the adjusting nut 4 always adheres to the top of the hub 1. When the adjusting nut 4 is loosened, i.e. the pitch guide rod 3 and the sliding block 2 move downward, due to the force exerted by the spring 5 on the pitch guide rod 3, the pitch guide rod 3 can be timely moved downward, so that the adjusting nut 4 can also always adhere to the top of the hub 1, without the need to manually press the pitch guide rod 3 downward, further improving the convenience during adjustment.

[0040] In a preferred embodiment of the application, the adjusting nut 4 is provided with a plurality of mounting holes 6 arranged at intervals in the circumferential direction, and the top of the hub 1 is provided with at least one threaded hole, and at least one first bolt 7 is inserted into the corresponding mounting hole 6 and assembled on the threaded hole.

[0041] In the above technical solution, when the pitch guide rod 3 needs to be moved, the first bolt 7 is loosened and removed, and then the adjusting nut 4 can be rotated. After adjustment is completed, the at least one threaded hole can correspond to one of the mounting holes 6, and the first bolt 7 is assembled on the threaded hole through the corresponding mounting hole 6, and the head of the first bolt 7 is tightly held on the adjusting nut 4, so that the adjusting nut 4 and the hub 1 can be fixed.

[0042] In a preferred embodiment of the application, the middle of the sliding block 2 is provided with a mounting through hole, and the outer wall of the pitch guide rod 3 is provided with a mounting portion 8 which can be fixedly clamped into the mounting through hole.

[0043] In the above technical solution, when the sliding block 2 and the pitch guide rod 3 are assembled, the mounting portion 8 on the pitch guide rod 3 is clamped into the mounting through hole by applying pressure, so that the sliding block 2 and the pitch guide rod 3 are connected together, and the assembly is simple and convenient.

[0044] In a preferred embodiment of the application, the upper part of the pitch guide rod 3 is provided with a positioning flange 9 in contact with the bottom of the sliding block 2.

[0045] In the above technical solution, the positioning flange 9 can play a positioning role when the slider 2 and the variable-pitch guide rod 3 are assembled, and can hold the slider 2 when the slider 2 is loose, and the blade assembly can be kept in a corresponding angle state because the spring 5 will exert a downward force on the slider 2.

[0046] In a preferred embodiment of the application, the bottom of the slider 2 is recessed and provided with a positioning groove for accommodating the positioning flange 9.

[0047] In the above technical solution, when the slider 2 and the variable-pitch guide rod 3 are assembled, the positioning flange 9 can enter the positioning groove; when the height inside the hub 1 is constant, the positioning groove can reduce the overall height of the slider 2 and the positioning flange 9, thereby increasing the movable range of the slider 2 and the angle adjustment range of the blade 11.

[0048] In a preferred embodiment of the application, the hub 1 comprises a lower hub 1 and an upper hub 1 fixedly connected to the lower hub 1 by a plurality of third bolts.

[0049] In the above technical solution, the hub 1 adopts a split structure, which is beneficial to manufacturing, processing and assembly.

[0050] The preferred embodiments of the application are described in detail above with reference to the accompanying drawings, but the application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the application within the technical concept of the application, and these simple modifications all belong to the protection scope of the application.

[0051] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the application will not further describe various possible combinations.

[0052] Furthermore, various different embodiments of the application can also be combined in any manner, as long as they do not deviate from the technical concept of the application, and they should also be considered as disclosed by the application.

Claims

1. A ground quick-adjusting fixed pitch propeller, characterized by, Include: The hub (1), the slider (2) slidingly assembled inside the hub (1), a plurality of blade assemblies assembled on the hub (1) and connected with the slider (2), and a variable pitch adjusting mechanism assembled on the hub (1) for driving the slider (2) to slide up and down to drive a plurality of blade assemblies to adjust synchronously; The variable pitch adjusting mechanism includes a variable pitch guide rod (3) connected with the slider (2) and sliding out of the hub (1), and an adjusting nut (4) threadedly connected with the upper end of the variable pitch guide rod (3) and detachably connected with the top of the hub (1); The variable pitch adjusting mechanism further includes a spring (5) located inside the hub (1) and sleeved on the variable pitch guide rod (3), and the two ends of the spring (5) are respectively in contact with the top of the slider (2) and the inner top of the hub (1); The adjusting nut (4) is provided with a plurality of mounting holes (6) arranged at intervals in the circumferential direction, and the top of the hub (1) is provided with at least one threaded hole, and at least one mounting hole (6) is provided with a first bolt (7) assembled in the corresponding threaded hole.

2. A ground-adjustable fixed pitch propeller according to claim 1, wherein, The slider (2) includes a slider body and a cover plate assembled on the slider body by a plurality of second bolts, and the side of the slider body close to the cover plate is provided with a plurality of installation grooves (10) corresponding to a plurality of blade assemblies.

3. A ground-adjustable fixed pitch propeller according to claim 2, wherein, The blade assembly includes a blade (11) rotatably assembled on the hub (1), a variable pitch slider (12) slidingly installed in the corresponding installation groove (10), and a variable pitch pin (13) eccentrically assembled on the blade (11) and slidingly inserted into the variable pitch slider (12).

4. A ground-adjustable fixed pitch propeller according to claim 1, wherein, The middle of the slider (2) is provided with an installation through hole, and the outer wall of the variable pitch guide rod (3) is provided with an installation portion (8) which can be fixedly clamped into the installation through hole.

5. A ground-adjustable fixed pitch propeller according to claim 1, wherein, The upper of the variable pitch guide rod (3) is provided with a positioning flange (9) in contact with the bottom of the slider (2).

6. A ground-adjustable fixed pitch propeller according to claim 1, wherein, The bottom of the slider (2) is recessed to provide a positioning groove for accommodating the positioning flange (9).

7. A ground-adjustable fixed pitch propeller according to claim 1, wherein, The hub (1) includes a lower hub (1) and an upper hub (1) fixedly connected with the lower hub (1) by a plurality of third bolts.

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