Propeller blade root structure

Abstract

The utility model discloses a propeller blade root structure, which relates to the technical field of propellers, is an integrated structure, and comprises a blade root cylindrical section, a blade root retainer ring and a blade body connecting section which are sequentially connected, a blade root arc is arranged at one end, close to the blade root retainer ring, of the blade body connecting section, and the blade root cylindrical section is connected with the blade root retainer ring. A blade root bearing hole is formed in the center of the end face of the blade root cylindrical section, a balance weight hole is formed in the center of the hole bottom of the blade root bearing hole, a variable-pitch pin mounting hole is further formed in the end face of the blade root cylindrical section, and a centrifugal variable-pitch block is arranged on the side wall of the blade body connecting section. The propeller blade root structure provided by the utility model can bear the load borne by the blade, and has the functions of balancing the weight moment of the propeller and changing the angle of the blade.

Description

Technical Field

[0001] This utility model relates to the field of propeller technology, and in particular to a propeller blade root structure. Background Technology

[0002] During operation, the blade root and blade body of a propeller continuously reciprocate to achieve the desired power output by adjusting the blade angle under different altitudes and flight speeds. Simultaneously, the blade root is a critical load-bearing component. Throughout takeoff, climb, cruise, descent, and taxiing, the propeller must withstand centrifugal force, centrifugal bending moment, aerodynamic lift, aerodynamic drag, and aerodynamic bending moment loads. The blade root must bear the maximum load values ​​of these loads and transfer them to the hub. The function of the blade root is crucial; in addition to bearing the aforementioned loads, it must also balance the propeller's weight torque and adjust the blade angle.

[0003] Based on this, the inventor designed a propeller blade root structure to meet the aforementioned functional requirements of the propeller. Utility Model Content

[0004] The purpose of this invention is to provide a propeller blade root structure to solve the problems existing in the prior art, which can bear the load on the blade and has the functions of balancing the propeller weight torque and changing the blade angle.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a propeller blade root structure, which is an integral structure comprising a blade root cylindrical section, a blade root retaining ring, and a blade body connecting section connected in sequence. The end of the blade body connecting section near the blade root retaining ring is provided with a blade root arc. The end face of the blade root cylindrical section is provided with a blade root bearing hole at its center. The bottom center of the blade root bearing hole is provided with a counterweight hole. The end face of the blade root cylindrical section is also provided with a pitch pin mounting hole. The side wall of the blade body connecting section is provided with a centrifugal pitch block.

[0007] Preferably, the variable pitch pin mounting hole has 2 to 3 holes.

[0008] Preferably, the blade root structure is made of forged aluminum alloy.

[0009] The present invention achieves the following technical advantages over the prior art:

[0010] The propeller blade root structure provided by this utility model adopts an integrated structure with high overall strength, capable of bearing the load on the blade. If the entire propeller is unbalanced, lead blocks can be installed in the counterweight holes at the blade root to ensure that the weight and torque of each blade are consistent, thus enabling the blade root structure to have the function of balancing the weight and torque of the propeller. By installing blade pitch pins in the pitch pin mounting holes, the hydraulic pump drives the pitch rod to move back and forth, causing the pitch slider on the pitch rod to move back and forth. The reciprocating movement of the pitch slider causes the blade pitch pins to rotate around the blade axis, driving the blade body to rotate, thereby realizing the change of blade angle, thus enabling the blade root structure to have the function of changing the blade angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the propeller blade root structure provided by this utility model;

[0013] Figure 2 A cross-sectional view of the propeller blade root structure provided by this utility model;

[0014] Figure 3 A side view of the propeller blade root structure provided by this utility model;

[0015] Figure 4 This is a schematic diagram showing the fit between the blade root arc and the thrust bearing in this utility model;

[0016] Figure 5 This is a schematic diagram of the structure that drives the blade angle to change in this utility model.

[0017] In the diagram: 1-blade root cylindrical section, 2-blade root retaining ring, 3-blade body connecting section, 4-blade root arc, 5-blade root bearing hole, 6-counterweight hole, 7-pitch pin mounting hole, 8-centrifugal pitch block, 9-blade body, 10-thrust bearing, 11-blade pitch pin, 12-pitch rod, 13-pitch slider, 14-blade axis. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The purpose of this invention is to provide a propeller blade root structure to solve the problems existing in the prior art. It can bear the load on the blade and has the functions of balancing the propeller weight torque and changing the blade angle.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-Figure 5 As shown, this embodiment provides a propeller blade root structure. The blade root structure is a one-piece forged aluminum alloy structure, including a blade root cylindrical section 1, a blade root retaining ring 2, and a blade body connecting section 3 connected in sequence. The blade body connecting section 3 has a blade root arc 4 at one end near the blade root retaining ring 2. The end face of the blade root cylindrical section 1 has a blade root bearing hole 5 at its center. The bottom center of the blade root bearing hole 5 has a counterweight hole 6. The end face of the blade root cylindrical section 1 also has a variable pitch pin mounting hole 7. There are 2 to 3 variable pitch pin mounting holes 7. The side wall of the blade body connecting section 3 has a centrifugal variable pitch block 8.

[0022] The cylindrical section 1 at the blade root is used for axial positioning of the entire blade; the bearing hole 5 at the blade root is used to install the centering bearing and bear the bending moment brought by the blade body 9; the retaining ring 2 at the blade root is used to prevent the thrust bearing 10 from falling off after it is installed at the blade root; the circular arc 4 at the blade root is used to cooperate with the thrust bearing 10 when it is installed at the blade root; when the blade is installed on the propeller, if the entire propeller is unbalanced, lead blocks can be installed in the counterweight hole 6 at the blade root to make the weight and torque of each blade consistent. When the propeller is working, the centrifugal pitch block 8 is used to help the blade change the angle. When the propeller rotates, the centrifugal pitch block 8 generates centrifugal force through its own weight, which helps the blade overcome the torque generated by the blade's own weight and achieve pitch change freedom. The pitch pin mounting hole is used to install the blade pitch pin 11. The hydraulic pump drives the pitch rod 12 to move back and forth, which causes the pitch slider 13 on the pitch rod 12 to move back and forth. The reciprocating movement of the pitch slider 13 drives the blade pitch pin 11 to rotate around the blade axis 14, which drives the blade body 9 to rotate, thereby realizing the change of blade angle, which is the pitch change.

[0023] The propeller blade root structure adopts a one-piece forged aluminum alloy structure, which can well withstand the load on the blade body. Through the setting of the counterweight hole 6, lead blocks can be installed in the counterweight hole 6 at the blade root to keep the weight torque of each blade consistent, that is, it has the function of balancing the weight torque of the propeller.

[0024] The propeller blade root structure provided by this utility model can be used in the propeller blade structure of UAVs, and can meet various flight conditions of UAVs during long-duration and high-load flight.

[0025] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A propeller blade root structure, characterized in that: The blade root structure is an integrated structure, including a blade root cylindrical section, a blade root retaining ring and a blade body connecting section connected in sequence, a blade root arc is provided at one end of the blade body connecting section close to the blade root retaining ring, a blade root bearing hole is provided at the center of the end face of the blade root cylindrical section, a counterweight hole is provided at the center of the bottom of the blade root bearing hole, a pitch pin mounting hole is also provided on the end face of the blade root cylindrical section, and a centrifugal pitch block is provided on the side wall of the blade body connecting section.

2. The propeller blade root structure according to claim 1, characterized in that: The variable pitch pin mounting holes are provided with 2 to 3 holes.

3. The propeller blade root structure according to claim 1, characterized in that: The blade root structure is made of forged aluminum alloy material.

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