Propeller blade assembly and aircraft

Abstract

The utility model discloses a kind of propeller blade assembly and aircraft, including paddle, paddle expansion sleeve and paddle petiole, paddle expansion sleeve is set in the paddle root of paddle, paddle is connected by paddle expansion sleeve and paddle petiole formation connection.The utility model is connected by the cooperation of paddle petiole and paddle expansion sleeve, while meeting the strength requirement of connecting structure, the requirement of weight, gravity center, rigidity and cost is considered, to provide effective solution for propeller blade performance improvement, so that the connecting structure meets the high performance requirement, with good economy and market competitiveness.

Description

Technical Field

[0001] This utility model relates to the field of aircraft, and in particular to a propeller blade assembly and an aircraft. Background Technology

[0002] As one of the core components of an aircraft, the propeller blade's primary function is to generate lift, enabling the aircraft to take off vertically, hover, and land. The structural design of the propeller blade root directly affects the overall performance, safety, and economy of the aircraft. Currently, traditional propeller blade root structures have many shortcomings. Some blade root structures are complex, with numerous components. This not only increases the difficulty of manufacturing and assembly and raises production costs, but also makes the excessive number of components prone to loosening and wear during long-term use, reducing the reliability and stability of the structure.

[0003] Therefore, there is an urgent need to develop a propeller blade assembly and aircraft that, through the matching connection between the blade shank and the blade expansion sleeve, meets the strength requirements of the connection structure while taking into account the requirements of weight, center of gravity, stiffness and cost, and provides an effective solution for improving propeller blade performance. This connection structure should meet the high performance requirements while possessing good economic efficiency and market competitiveness. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a propeller blade assembly and an aircraft, which, through the cooperation and connection of the blade shank and the blade expansion sleeve, meets the strength requirements of the connection structure while taking into account the requirements of weight, center of gravity, rigidity and cost.

[0005] The propeller blade assembly of this utility model includes a blade, a blade expansion sleeve, and a blade shank. The blade expansion sleeve is disposed at the root of the blade, and the blade is connected to the blade shank through the blade expansion sleeve.

[0006] Furthermore, the blade expansion sleeve and the blade shank are connected and fixed by bolts. The bolts are also provided with limiting bushings fitted onto the bolts. The surface of the limiting bushings is formed with several cross-sections for limiting the axial rotation of the blades.

[0007] Furthermore, the blade expansion sleeve is a truncated cone with a hollow interior and bottom, and the top of the blade expansion sleeve is also provided with an opening I that conforms to the shape of the limiting bushing.

[0008] Furthermore, the blade includes blade ply, blade spars and blade filler, the blade ply covering the blade spars to form a blade structure, and the blade filler filling the interior of the blade.

[0009] Furthermore, the blade beam is wrapped around the blade expansion sleeve to form a blade root structure.

[0010] Furthermore, the blade shank includes a blade mounting portion and a hub connecting portion, the blade root is fitted onto the blade mounting portion, and the blade mounting portion is provided with an opening II that conforms to the limiting bushing.

[0011] Furthermore, the outer edge of the blade mounting portion is provided with an inwardly recessed step, the step having a barbed structure, and the blade ply wrapping around the step.

[0012] Furthermore, the hub connection part is provided with a plurality of circumferentially distributed mounting holes on the mounting surface of the hub, and the outer surface edge of the hub connection part is also provided with a positioning groove for positioning.

[0013] Furthermore, the mounting surface of the hub connection is formed with a countersunk platform that avoids the mounting hole, and communicates with a cavity inside the hub connection for fastening bolts.

[0014] An aircraft equipped with a propeller assembly as described in any of the above descriptions.

[0015] The beneficial effects of this utility model are as follows: The propeller blade assembly and aircraft of this utility model, through the cooperation and connection between the blade shank and the blade expansion sleeve, not only meet the strength requirements of the connection structure, but also take into account the requirements of weight, center of gravity, rigidity and cost, providing an effective solution for improving the performance of the propeller blade. This connection structure not only meets the high performance requirements, but also has good economic efficiency and market competitiveness. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the AA cross-sectional structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the blade and handle structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the blade handle end face structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the BB cross-sectional structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure at point C of this utility model;

[0023] Figure 7 This is a schematic diagram of the blade expansion sleeve structure of this utility model;

[0024] Figure 8 This is a schematic diagram of the DD cross-sectional structure of this utility model;

[0025] Figure 9 This is a schematic diagram of the limiting bushing structure of this utility model;

[0026] Figure 10 This is a schematic diagram of the end face structure of the limiting bushing of this utility model. Detailed Implementation

[0027] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the AA cross-sectional structure of this utility model; Figure 3 This is a schematic diagram of the blade and handle structure of this utility model; Figure 4 This is a schematic diagram of the blade handle end face structure of this utility model; Figure 5 This is a schematic diagram of the BB cross-sectional structure of this utility model; Figure 6 This is a schematic diagram of the structure at point C of this utility model; Figure 7 This is a schematic diagram of the blade expansion sleeve structure of this utility model; Figure 8 This is a schematic diagram of the DD cross-sectional structure of this utility model; Figure 9 This is a schematic diagram of the limiting bushing structure of this utility model;

[0028] Figure 10 This is a schematic diagram of the end face structure of the limiting bushing of this utility model. As shown in the figure: the propeller assembly of this embodiment includes a blade 1, a blade expansion sleeve 3, and a blade shank 2. The blade expansion sleeve 3 is disposed at the root of the blade 1, and the blade 1 is connected to the blade shank 2 through the blade expansion sleeve 3. In this embodiment, the propeller assembly, through the blade expansion sleeve 3 disposed at the root of the blade 1, allows the root to fit into the blade shank 2 to form a stable connection structure.

[0029] In this embodiment, the blade expansion sleeve 3 and the blade shank 2 are connected and fixed by bolts 5. The bolt 5 also has a limiting bushing 4 fitted onto it. The surface of the limiting bushing 4 has several cross-sections 401 formed to restrict the axial rotation of the blade 1. As shown in the figure, the blade expansion sleeve 3 and the blade shank 2 are connected and fixed by bolts 5, so that the blade 1 and the blade shank 2 are connected. Simultaneously, the bolt 5 also has a limiting bushing 4 fitted onto it. The surface of the limiting bushing 4 has several cross-sections 401 formed to restrict the axial rotation of the blade 1. Figure 9 and Figure 10 As shown, the limiting bushing 4 allows the bolt 5 to be rotated and tightened normally. After the bolt 5 is tightened, it ensures that there will be no relative axial rotation between the blade 1 and the blade shank 2, thus preventing any impact on the normal operation of the blade 1.

[0030] In this embodiment, the blade expansion sleeve 3 is a hollow frustum with a hollow interior and bottom. The top of the blade expansion sleeve 3 is also provided with an opening I 301 that conforms to the limiting bushing 4. As shown in the figure, the blade expansion sleeve 3 is a hollow frustum with a hollow interior and bottom. The bottom section of the blade expansion sleeve 3 is larger than the top section. The top of the blade expansion sleeve 3 is also provided with an opening I 301 that conforms to the limiting bushing 4. During installation, the matching limiting bushing 4 is first inserted into the opening I 301, and then the bolt 5 is inserted and rotated to tighten with the matching nut inside the blade expansion sleeve 3.

[0031] In this embodiment, the blade 1 includes a blade layup 101, a blade beam 102, and a blade filler 103. The blade layup 101 covers the blade beam 102 to form a blade structure, and the blade filler 103 fills the interior of the blade. As shown in the figure, the blade 1 includes a blade layup 101, a blade beam 102, and a blade filler 103. The blade layup 101 covers the blade beam 102 to form a blade structure, and the blade filler 103 fills the interior of the blade 1. The blade filler 103 can be made of foam or fiber material to reduce the weight of the blade and ensure the strength of the blade 1. This is prior art and will not be described in detail here.

[0032] In this embodiment, the blade beam 102 wraps around the blade expansion sleeve 3 to form a blade root structure; as shown in the figure, the blade beam 102 wraps around the outer ring of the blade expansion sleeve 3 to form a blade root structure, while the blade beam 102 avoids the opening I 301, so that the blade 1 and the blade expansion sleeve 3 form an integral structure and increase the overall strength of the connection.

[0033] In this embodiment, the blade handle 2 includes a blade mounting portion 201 and a hub connecting portion 202. The blade root is fitted into the blade mounting portion 201. The blade mounting portion 201 is provided with an opening II 207 that conforms to the limiting bushing 4. As shown in the figure, the blade handle 2 includes a blade mounting portion 201 and a hub connecting portion 202. The blade root is fitted into the blade mounting portion 201. The blade mounting portion 201 is provided with an opening II 207 that conforms to the limiting bushing 4. The blade expansion sleeve 3 and the blade beam 102 are fitted into the blade mounting portion 201. The limiting bushing 4 is installed through the opening II 207, and the bolts 5 are further installed and tightened to connect the blade 1 and the blade handle 2.

[0034] In this embodiment, the outer edge of the blade mounting portion 201 is further provided with an inwardly recessed step, the step is provided with a barb structure 208, and the blade ply 101 is wrapped around the step; as shown in the figure, the outer edge of the blade mounting portion 201 is further provided with an inwardly recessed step, the step is also provided with a barb structure 208, and the blade ply 101 is wrapped around the step. The barb structure 208 can effectively increase the friction between the blade ply 101 and the blade mounting portion 201, and prevent the blade ply 101 from falling off.

[0035] In this embodiment, the hub connection part 202 is mounted on the mounting surface of the hub and has several circumferentially distributed mounting holes 204. The outer surface edge of the hub connection part 202 is also provided with a positioning groove 203 for positioning. As shown in the figure, the hub connection part 202 is mounted on the mounting surface of the hub and has several circumferentially distributed mounting holes 204. The outer surface edge of the hub connection part 202 is also provided with a positioning groove 203 for positioning. The positioning groove 203 is used to fix the tilt angle of the blade 1 when the hub connection part 202 is mounted on the hub, and it is also convenient to determine the installation position during installation, thereby improving installation efficiency.

[0036] In this embodiment, the mounting surface of the hub connection 202 is formed with a recessed platform 205 that avoids the mounting hole 204, and communicates with the cavity 206 inside the hub connection 202 for fastening the bolt 5. As shown in the figure, the recessed platform 205 that avoids the mounting hole 204 on the mounting surface of the hub connection 202 prevents the strength of the mounting part from being affected. The recessed platform 205 communicates with the cavity 206 inside the hub connection 202 for fastening the bolt 5. The cavity 206 is used to install and fasten the bolt 5. The communication between the cavity 206 and the recessed platform 205 facilitates the installation of the bolt 5 and reduces the weight of the blade shank 2.

[0037] An aircraft is provided, wherein the aircraft is equipped with a propeller assembly as described above, which is connected by the cooperation of the blade shank 2 and the blade expansion sleeve 3. While meeting the strength requirements of the connection structure, it also takes into account the requirements of weight, center of gravity, stiffness and cost, providing an effective solution for improving the performance of the propeller blade. This connection structure meets the high performance requirements while having good economic efficiency and market competitiveness.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A propeller blade assembly, characterized in that: It includes a blade, a blade expansion sleeve, and a blade shank. The blade expansion sleeve is disposed at the root of the blade, and the blade is connected to the blade shank through the blade expansion sleeve.

2. The propeller blade assembly according to claim 1, characterized in that: The blade expansion sleeve and the blade shank are connected and fixed by bolts. The bolts are also provided with limiting bushings fitted onto the bolts. The surface of the limiting bushings is formed with several cross-sections for limiting the axial rotation of the blades.

3. The propeller blade assembly according to claim 2, characterized in that: The blade expansion sleeve is a truncated cone with a hollow interior and bottom, and the top of the blade expansion sleeve is also provided with an opening I that conforms to the shape of the limiting bushing.

4. The propeller blade assembly according to claim 2, characterized in that: The blade includes blade ply, blade spars and blade filler, the blade ply covering the blade spars to form a blade structure, and the blade filler filling the interior of the blade.

5. The propeller blade assembly according to claim 4, characterized in that: The blade beam is wrapped around the blade expansion sleeve to form a blade root structure.

6. The propeller blade assembly according to claim 4, characterized in that: The blade handle includes a blade mounting part and a hub connecting part. The blade root is fitted into the blade mounting part, and the blade mounting part is provided with an opening II that conforms to the limiting bushing.

7. The propeller blade assembly according to claim 6, characterized in that: The outer edge of the blade mounting section is also provided with an inwardly recessed step, the step is provided with a barbed structure, and the blade ply wraps around the step.

8. The propeller blade assembly according to claim 6, characterized in that: The hub connector is mounted on the mounting surface of the hub and has several circumferentially distributed mounting holes. The outer surface edge of the hub connector is also provided with a positioning groove for positioning.

9. The propeller blade assembly according to claim 8, characterized in that: The mounting surface of the rotor hub connection has a recessed platform that avoids the mounting hole, and the recessed platform communicates with a cavity inside the rotor hub connection for accommodating the bolt.

10. An aircraft, characterized in that: The aircraft is equipped with a propeller assembly as described in any one of claims 1-9.

Images