Connecting structure for propeller and propeller

Abstract

The invention belongs to the technical field of propellers, and particularly relates to a connecting structure for a propeller and the propeller. The connecting structure comprises a paddle root shaft and a paddle, a positioning groove is formed in the end face of the paddle root shaft, a positioning block is arranged at the root of the paddle, and the positioning block is connected with the positioning groove in a clamped mode. According to the connecting structure, the positioning groove is formed in the end face of the paddle root shaft, the positioning block matched with the positioning groove in shape and size is arranged at the root of the paddle, the positioning block is inserted into the positioning groove, and after the positioning block completely enters the positioning groove, mechanical interlocking (the connecting structure during locking) is formed between the positioning block and the positioning groove; due to the accurate matching between the positioning groove and the positioning block, the interlocking connection ensures the firm connection between the paddle and the paddle root shaft.

Description

Technical Field

[0001] The invention belongs to the technical field of propellers, and in particular relates to a connection structure for a propeller and a propeller. Background Art

[0002] In the aviation field, propellers are the core components of aircraft power systems, and their reliability and stability are crucial to flight safety. During operation, propeller blades must withstand vibration stress from the engine and airflow, and bear high bending stress and huge centrifugal stress. These complex and huge stresses cause propeller blades to easily detach from the hub during long-term operation, which in turn causes serious safety accidents.

[0003] The existing connection method between the propeller and the hub mainly adopts the threaded fastening method, that is, the root of the blade is fixed to the hub through the thread. This method usually requires the use of multiple parts such as pre-tightening nuts, filling blocks, blade stalk sleeves, etc., which not only makes the propeller complicated, but also the assembly process is cumbersome, time-consuming, labor-intensive, and inefficient. Especially for blades made of carbon fiber composite materials, due to their relatively large molding size tolerance, they cannot be as precise as metal materials, which brings more difficulties to the threaded fastening method. In addition, although the existing bearing-fixed connection method can replace threaded fastening in some cases, the problem of inconvenient maintenance still exists. When the blades need to be replaced or repaired, the entire hub often needs to be removed, which increases the maintenance cost and difficulty. Summary of the invention

[0004] The purpose of the present invention is to at least solve the problem that the connection between the propeller blade and the hub is complex and the assembly process is complicated. This purpose is achieved by the following technical solutions:

[0005] A first aspect of the present invention provides a connection structure for a propeller, comprising:

[0006] A pulp root shaft, wherein a positioning groove is provided on the end surface of the pulp root shaft;

[0007] The blade has a positioning block at its root, and the positioning block is engaged with the positioning groove.

[0008] According to the connection structure of the present invention, a positioning groove is provided on the end face of the root shaft of the propeller, and a positioning block matching the shape and size of the positioning groove is provided at the root of the blade. The positioning block is inserted into the positioning groove. When the positioning block completely enters the positioning groove, a mechanical interlock is formed between the positioning block and the positioning groove (when the connection structure is locked). Due to the precise fit between the positioning groove and the positioning block, this interlocking connection ensures a firm connection between the blade and the root shaft of the propeller. The snap-fit ​​design of the positioning groove and the positioning block eliminates a number of complex parts in traditional propellers, such as threaded fasteners, pre-tightening nuts, filling blocks, etc. By reducing the number of parts, the overall structure is significantly simplified, and the complexity of manufacturing and assembly is reduced. At the same time, the precise fit between the positioning groove and the positioning block makes the connection between the blade and the root shaft more intuitive and faster. During the assembly process, the blade can be installed by simply inserting or sliding, without the need for additional fastening or adjustment steps, which greatly improves assembly efficiency and saves time and labor costs.

[0009] In addition, the propeller according to the present invention may also have the following additional technical features:

[0010] In some embodiments of the present invention, the outer circumferential surface of the pulp root shaft is provided with a through hole, and along the radial direction of the pulp root shaft, one side of the positioning groove is connected with the outer circumferential surface of the pulp root shaft via the through hole, and the positioning block can be inserted into the positioning groove from the through hole and be engaged with the positioning groove.

[0011] In some embodiments of the present invention, the propeller further includes a limiting member, which is connected to the through-hole and limits the blade along the radial direction.

[0012] In some embodiments of the present invention, the limiting member is a limiting plate, the pulp root shaft is provided with a strip groove along its axial direction, the strip groove intersects with the through opening, the limiting plate can be inserted into the strip groove from the side of the strip groove away from the blade, and the limiting plate is connected to the pulp root shaft by bolts.

[0013] In some embodiments of the present invention, along a cross section perpendicular to the axial direction, the positioning groove has an arc-shaped structure.

[0014] In some embodiments of the present invention, the cross-sectional area of ​​the positioning groove gradually increases along the direction from the groove opening to the groove bottom of the positioning groove, and the outer peripheral surface of the positioning block abuts against the groove wall of the positioning groove.

[0015] In some embodiments of the present invention, a chamfer is provided at a connection between the groove wall and the groove bottom of the positioning groove.

[0016] In some embodiments of the present invention, the positioning block includes a top surface, a bottom surface, and a first side surface, a second side surface, a third side surface, a fourth side surface, and a fifth side surface arranged around the top surface and the bottom surface, a first angle is formed between the first side surface and the second side surface, a first angle is formed between the fourth side surface and the fifth side surface, and a second angle is formed between the third side surface and the second side surface and the fourth side surface, respectively.

[0017] A second aspect of the present invention provides a propeller, comprising:

[0018] The above-mentioned connection structure;

[0019] A propeller hub, wherein a bearing is provided on the propeller hub, and the propeller root shaft is connected to the bearing;

[0020] A driving mechanism is connected to the pulp root shaft in driving relationship, and is used to drive the pulp root shaft to rotate along its own axis.

[0021] In some embodiments of the present invention, the bearing is a ball bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0023] Figure 1 A schematic diagram of a first partial structure of a propeller according to an embodiment of the present invention is schematically shown;

[0024] Figure 2 The structure diagram of the blade according to the embodiment of the present invention is schematically shown;

[0025] Figure 3 The structural diagram of the pulp root shaft according to the embodiment of the present invention is schematically shown;

[0026] Figure 4 A second partial structural diagram of a propeller according to an embodiment of the present invention is schematically shown.

[0027] The reference numerals are as follows:

[0028] 10. Paddle root shaft; 11. Positioning groove; 12. Strip groove; 20. Paddle blade; 21. Positioning block; 211. Top surface; 212. First side surface; 213. Second side surface; 214. Third side surface; 215. Fourth side surface; 216. Fifth side surface; 30. Limiting member. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0030] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0031] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0032] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0033] like Figures 1 to 4 As shown, according to an embodiment of the present invention, a connection mechanism for a propeller is proposed, including a propeller root shaft 10 and a blade 20, wherein a positioning groove 11 is provided on the end surface of the propeller root shaft 10, and a positioning block 21 is provided at the root of the blade 20, and the positioning block 21 is snap-connected with the positioning groove 11.

[0034] According to the connection structure of the present invention, a positioning groove 11 is provided on the end face of the root shaft 10, and a positioning block 21 matching the shape and size of the positioning groove 11 is provided at the root of the blade 20. The positioning block 21 is inserted into the positioning groove 11. When the positioning block 21 completely enters the positioning groove 11, a mechanical interlock is formed between the positioning block 21 and the positioning groove 11 (when the connection mechanism is locked). Due to the precise fit between the positioning groove 11 and the positioning block 21, this interlocking connection ensures a firm connection between the blade 20 and the root shaft. The snap-fit ​​design of the positioning groove 11 and the positioning block 21 eliminates a number of complex parts in the connection structure of the traditional propeller, such as threaded fasteners, pre-tightening nuts, filling blocks, etc. By reducing the number of parts, the overall structure is significantly simplified, and the complexity of manufacturing and assembly is reduced. At the same time, the precise fit between the positioning groove 11 and the positioning block 21 makes the connection between the blade 20 and the root shaft 10 more intuitive and faster. During the assembly process, the blade 20 can be installed by simply inserting or sliding, without the need for additional fastening or adjustment steps, which greatly improves assembly efficiency and saves time and labor costs.

[0035] In some embodiments, along the radial direction of the root shaft 10, one side of the positioning groove 11 is connected with the outer peripheral surface of the root shaft 10, so that there is a through hole on the outer peripheral surface of the root shaft 10, and the positioning block 21 can be inserted into the positioning groove 11 from the through hole and snap-fit ​​with the positioning groove 11. The assembly method using this embodiment includes that during the assembly process, the operator aligns the positioning block 21 of the blade 20 with the through hole on the outer peripheral surface of the root shaft, and inserts the positioning block 21 into the positioning groove 11 along the radial direction. After the positioning block 21 completely enters the positioning groove 11 through the through hole, it is tightly matched with the inner wall of the positioning groove 11 to achieve mechanical snap-fit, thereby fixing the connection between the blade 20 and the root shaft. After the snap-fit ​​is completed, the positioning block 21 is locked in the radial and axial directions due to the snap-fit ​​with the positioning groove 11, ensuring a stable connection between the blade 20 and the root shaft. When the blade 20 needs to be disassembled, the operator can apply appropriate external force through the through-hole to pull the positioning block 21 out of the positioning groove 11, thereby completing the disassembly of the blade 20. By setting a through-hole on the blade root shaft, the positioning block 21 can be directly inserted into the positioning groove 11 from the outside, avoiding complicated alignment and rotation operations. Compared with the traditional connection method, this design greatly simplifies the assembly process, making the installation of the blade 20 more intuitive and efficient.

[0036] In some embodiments, along the direction from the notch of the positioning groove 11 to the bottom of the groove, the cross-sectional area of ​​the positioning groove 11 gradually increases, and the outer peripheral surface of the positioning block 21 abuts against the groove wall of the positioning groove 11. Since the cross-sectional area of ​​the positioning groove 11 gradually increases, when the positioning block 21 is inserted into the positioning groove 11, as the insertion depth increases, the contact area between the positioning block 21 and the groove wall gradually increases, forming a tighter clamping. This design provides a progressive locking effect, ensures the stability of the positioning block 21 in the groove, and improves the reliability of the connection. In addition, when the positioning block 21 is fully inserted into the positioning groove 11, the increasing cross-sectional area will produce a wedge effect, tightly clamping the positioning block 21 to prevent it from loosening or shifting due to vibration or external force during operation. This design is particularly suitable for high-vibration or high-stress application scenarios to ensure long-term stability of the connection.

[0037] Specifically, the positioning block 21 can be a trapezoidal protrusion, with a narrower side connected to the blade 20 and a wider side abutting against the bottom of the groove. A trapezoidal groove matching the trapezoidal positioning block 21 is provided on the root shaft of the propeller, the upper part of the groove is narrower and the bottom is wider, and it fits tightly with the trapezoidal block. The trapezoidal structure gradually tightens during the insertion process, providing a stronger mechanical locking force. After the positioning block 21 is inserted into the groove, a wedge-shaped lock is formed to prevent loosening in any direction.

[0038] Specifically, the positioning block 21 can be a convex block with a dovetail cross-section, with a narrow side connected to the blade 20 and a wider side abutting against the bottom of the groove. A dovetail groove matching the dovetail positioning block 21 is provided on the blade root shaft, with a wider bottom and a narrower top. After the dovetail convex block is inserted into the dovetail groove through the through opening, a strong locking is achieved through the clamping effect of the wide and narrow structure, especially with extremely strong tensile resistance in the axial direction.

[0039] It is understandable that the connection between the groove wall and the groove bottom of the positioning groove 11 is provided with a chamfer. The chamfer design can guide the positioning block 21 to be inserted into the positioning groove 11 more smoothly, reducing the jamming phenomenon during the assembly process. This design can significantly improve the convenience and efficiency of operation in actual assembly, especially in situations where fast and frequent assembly is required. In addition, during the insertion process, the edge of the positioning block 21 may come into contact with the groove wall or the groove bottom. If there is no chamfer design, the sharp edge may scratch the positioning block 21, causing damage to the surface of the positioning block 21. The presence of the chamfer can alleviate this contact and reduce the wear and damage of the edge of the positioning block 21.

[0040] It is understandable that if Figure 2As shown, the positioning block 21 includes a top surface 211, a bottom surface, and a first side surface 212, a second side surface 213, a third side surface 214, a fourth side surface 215, and a fifth side surface 216 arranged around the top surface 211 and the bottom surface, a first angle is formed between the first side surface 212 and the second side surface 213, a second angle is formed between the fourth side surface 215 and the fifth side surface 216, and a second angle is formed between the third side surface 214 and the second side surface 213 and the fourth side surface 215, respectively. Specifically, the bottom surface is parallel to the through-opening and is designed to extend into the interior of the positioning groove 11. The top surface 211 is parallel to the bottom surface and is close to the through-opening, which means that it does not enter the groove, but is in contact with or close to the through-opening. This arrangement helps to maintain a stable connection between the positioning block 21 and the blade root shaft. Since the bottom surface extends into the positioning groove 11, the bottom surface of the positioning block 21 is in close contact with the groove wall of the positioning groove 11, providing a solid mechanical support. This contact point can effectively withstand radial forces, especially during the vibration process generated when the blade 20 rotates, to maintain a stable connection between the blade 20 and the blade root shaft. Since the top surface 211 and the bottom surface are parallel to the through-hole, such a geometric arrangement facilitates precise alignment during assembly. When the positioning block 21 is inserted into the positioning groove 11, the error can be reduced by parallel insertion of the bottom surface, thereby improving the assembly accuracy. This structural design simplifies the alignment process and reduces the misalignment problem that occurs during installation.

[0041] Specifically, the first side surface 212 and the second side surface 213 are arranged on one side of the positioning block 21, and the fourth side surface 215 and the fifth side surface 216 are arranged on the other side of the positioning block 21, and there is a first angle between the first side surface 212 and the second side surface 213, and there is also a first angle between the fourth side surface 215 and the fifth side surface 216. Taking the first side surface 212 and the second side surface 213 as an example, these two side surfaces play an important guiding and limiting role when the positioning block 21 is inserted into the positioning groove 11. Due to the design of the first angle between them, it can be ensured that the positioning block 21 forms a firm clamping connection with the groove wall when inserted into the notch. Through the angle matching of the first side surface 212 and the second side surface 213, the lateral movement of the positioning block 21 after being inserted into the positioning groove 11 can be effectively limited to prevent it from sliding in the axial direction. The design of the first side surface 212 and the second side surface 213 is mainly used to match with the inner wall of the positioning groove 11 to provide multi-point contact locking. This structure increases the clamping stability of the positioning block 21 and helps to improve the assembly accuracy. The fourth side surface 215 and the fifth side surface 216 are similar to the first side surface 212 and the second side surface 213, and are mainly used to contact with the other side wall of the positioning groove 11 to form a snap-on lock. Since these side surfaces are symmetrical with the design of the first side surface 212 and the second side surface 213, it is ensured that the positioning block 21 is subjected to uniform force on both sides, and its radial limiting effect is further enhanced. The first angle design between the first side surface 212, the second side surface 213 and the fourth side surface 215 and the fifth side surface 216 allows the positioning block 21 to be axially and radially limited when inserted into the positioning groove 11. This multi-faceted design not only increases the contact area, but also provides more locking points for the positioning block 21 in the radial direction to prevent it from sliding laterally when subjected to force.

[0042] Specifically, the third side surface 214 is located in the middle of the positioning block 21 and abuts against the bottom of the positioning groove 11. It is the load-bearing surface of the positioning block 21 and is in close contact with the bottom of the groove. The third side surface 214 provides the main support in the vertical direction. Through the contact with the bottom of the positioning groove 11, the third side surface 214 can bear the axial load (for example, the vertical force caused by centrifugal force or vibration) generated by the blade 20 during the rotation process. The third side surface 214 forms a solid support point through its direct contact with the bottom of the groove. It bears part of the weight and dynamic load of the blade 20, and ensures that the positioning block 21 does not slide or displace in the axial direction.

[0043] Specifically, the third side surface 214 has a second angle with the second side surface 213 and the fourth side surface 215 respectively. The second side surface 213 and the fourth side surface 215 are located on both sides of the positioning block 21 and are connected to the third side surface 214 through the second angle. The second side surface 213 and the fourth side surface 215 respectively assume the limiting function in different directions. The second angle is the angle formed between the third side surface 214 and the two side surfaces. The existence of the second angle enhances the locking effect of the positioning block 21 and increases the mechanical strength through multi-faceted contact. The design of the second angle enables the third side surface 214 to not only form a firm vertical support with the bottom of the groove, but also provide more limiting directions through the angled contact with the second side surface 213 and the fourth side surface 215. This design effectively prevents the positioning block 21 from sliding or rotating in multiple directions, ensuring that the positioning block 21 can be locked in any direction. At the same time, the second angle ensures that the second side surface 213 and the fourth side surface 215 of the positioning block 21 are in multi-point contact with the groove wall, which not only increases the clamping points, but also further enhances the strength of the mechanical locking. Even under high load or high vibration conditions, the positioning block 21 can maintain a stable connection to prevent any loosening or displacement. In addition, during the high-speed rotation of the propeller, the positioning block 21 needs to withstand a large rotation torque, and the existence of the second angle enhances the torsion resistance of the positioning block 21. By forming an angle between multiple side surfaces and the groove wall, this design effectively offsets the torque generated by the rotation and prevents the positioning block 21 from rotating or sliding in the groove.

[0044] Specifically, the first angle ranges from 140° to 160°, and the optimal embodiment is 150°. Taking the first angle of 150° as an example, the angle of 150° is very close to straight, indicating that the transition between the first side 212 and the second side 213 and the fourth side 215 and the fifth side 216 is very gentle. Such a design makes the side surface almost present a straight line structure, providing a larger contact area, ensuring that there are more force distribution points during assembly. Since the angle of 150° is close to a parallel plane, the friction and resistance between the positioning block 21 and the groove wall will be relatively small during insertion, making the assembly process smoother and reducing the risk of jamming or dislocation. At the same time, the large angle design increases the contact area, especially when subjected to radial and axial forces, it can more evenly disperse external forces, reduce local stress concentration, and improve the locking force.

[0045] Specifically, the second angle ranges from 110° to 130°, and the optimal embodiment is 120°, with the second angle of 120° being used as an example. The angle of 120° is relatively small, which means that a more obvious angle change is formed between the third side 214 and its adjacent second side 213 and fourth side 215. This smaller angle design can play a stronger limiting and supporting role in the mechanical structure. The angle of 120° can provide better torsion resistance, especially when the propeller rotates at high speed, it can effectively resist the torque generated by the rotation. The smaller angle ensures that the positioning block 21 will not rotate or slide in the groove. The 120° angle formed between the third side 214 and the second side 213 and the fourth side 215 provides additional support, which can ensure that the positioning block 21 is firmly limited in multiple directions after assembly to prevent displacement.

[0046] Specifically, the first side surface 212 and the fifth side surface 216 are located on opposite sides of the positioning block 21 and are close to the through-opening. Both the first side surface 212 and the fifth side surface 216 have a first curvature, and the first curvature indicates that these two sides are not straight, but slightly curved. This curved surface design can provide a smooth introduction effect, especially reducing friction resistance during assembly, so that the positioning block 21 can enter the positioning groove 11 more smoothly. Since the first side surface 212 and the second side surface 213 have the same curvature, the positioning block 21 can be naturally introduced along the curvature of the wall of the positioning groove 11 during the insertion process, reducing friction resistance. This design greatly improves the assembly efficiency, especially in scenarios where quick assembly is required.

[0047] Specifically, the second side surface 213 and the fourth side surface 215 are located on opposite sides of the positioning block 21. The second side surface 213 and the fourth side surface 215 also adopt a curved surface design, so that when inserted into the positioning groove 11, a larger contact area can be formed with the groove wall through the curved surface. The curved design of the arc provides a strong radial limit for the positioning block 21, especially when subjected to torque or external force impact, the locking force of the curved surface is stronger.

[0048] Furthermore, the connection structure also includes a limiter 30, which is connected to the through-hole and limits the blade 20 in the radial direction of the root axis 10. The limiter 30 can be connected to the through-hole by means of snaps, pins, welding or gluing. A portion of the limiter 30 is located in the through-hole, and the other portion extends to the side of the blade 20 in the radial direction of the root axis. The radially extending portion of the limiter 30 is in close contact with the side of the blade 20, limiting the radial movement of the blade 20. This ensures that the blade 20 does not slide radially when subjected to centrifugal force, vibration or other external forces, thereby maintaining the correct positioning of the blade 20. At the same time, by adding the limiter 30, the blade 20 is subjected to multiple constraints after connection, especially effective limitation in the radial direction. The close fit between the limiter 30 and the through-hole prevents any displacement or loosening of the blade 20 under high load conditions, ensuring the long-term stability of the connection.

[0049] Specifically, the limiting member 30 is a limiting plate, and the root shaft 10 is provided with a strip groove 12 along its own axial direction, and the strip groove 12 intersects with the through-opening, and the limiting plate can be inserted into the strip groove 12 from the side of the strip groove 12 away from the blade 20, and the limiting plate is connected to the root shaft 10 by bolts. The root shaft 10 is provided with a strip groove 12 along its axial direction, and the strip groove 12 intersects with one side of the through-opening. The limiting plate can be inserted into the strip groove 12 of the root shaft from the side away from the blade 20, forming a cross fit with the through-opening. The limiting plate is a flat structure that can effectively limit the radial movement of the blade 20. It is firmly connected to the root shaft by bolts. After the limiting plate is inserted into the strip groove 12, the bolts fix it to the root shaft through the limiting plate to ensure that the limiting plate will not loosen or shift. After the limit plate is inserted into the strip groove 12 of the propeller root shaft, it is fixed on the propeller root shaft, thereby limiting the blade 20 in the radial direction. The limit plate ensures that the blade 20 remains correctly positioned during rotation by closely fitting with the propeller root shaft, preventing the blade 20 from moving or loosening in the radial direction. By cooperating with the strip groove 12 of the propeller root shaft, the limit plate accurately limits the blade 20 in the radial direction. The propeller effectively prevents the radial movement of the blade 20 due to centrifugal force or vibration during high-speed rotation, ensuring that the blade 20 always remains in the correct position. The limit plate is firmly fixed to the propeller root shaft by bolts, ensuring that it will not loosen or fall off during operation. This mechanical locking method improves the structural stability of the entire propeller system, especially under high loads or extreme working conditions, the limit plate can withstand greater forces.

[0050] It can be understood that the strip groove 12 penetrates the pulp root shaft 10 along the axial direction of the pulp root shaft 10. That is, one end of the strip groove 12 intersects and communicates with the through opening, and the other end of the strip groove has a through opening with the pulp root shaft 10, and the limit plate can be inserted into the strip groove 12 from the through opening.

[0051] It can be understood that along the cross section perpendicular to the root axis 10, the positioning groove 11 is an arc-shaped structure. Specifically, on the cross section perpendicular to the root axis, the inner contour of the positioning groove 11 is an arc-shaped structure, and the arc-shaped groove extends radially along the root axis, so that the positioning groove 11 has a certain curvature in the cross section. The shape of the positioning block 21 of the blade 20 matches the arc-shaped structure of the positioning groove 11, and is usually also designed to be an arc or a partial arc shape so that it can be tightly embedded in the arc-shaped groove. During the assembly process, the positioning block 21 is inserted into the arc-shaped interior of the positioning groove 11 through the through opening. Due to the arc-shaped design, the positioning block 21 can contact the groove wall along the entire arc when inserted, and form a stable mechanical clamping. After the positioning block 21 is fully embedded in the arc-shaped groove, multi-point contact is formed through the geometric characteristics of the arc-shaped groove, which further enhances the radial and axial fixing effects. The arc-shaped structure provides a larger contact area and more uniform force distribution than the straight structure. The multi-point contact between the positioning block 21 and the arc groove wall can effectively disperse the radial and axial forces generated by the blade 20 during operation, increasing the overall stability and impact resistance of the connection. At the same time, the arc structure has a natural torsion resistance. Due to the curved structure of the arc groove, the positioning block 21 will be effectively confined within its arc track after being embedded, preventing the blade 20 from rotating or twisting during operation, thereby maintaining its correct installation angle.

[0052] This embodiment also provides a propeller, including the above-mentioned connection structure, a hub and a drive structure, wherein a bearing is provided on the hub, and the bearing is connected after tracking, and the drive mechanism rotates with the root shaft 10 along its own axis. Specifically, the hub serves as the central part of the propeller, connecting and fixing the blades 20. A bearing is provided on the hub for supporting and guiding the rotational movement of the root shaft. The bearing is arranged in the hub, providing low-friction rotation support so that the root shaft can rotate smoothly and freely along its axis. The root shaft reliably connects the blade 20 to the hub through the positioning groove 11 and the positioning block 21, and rotates along its own axis under the action of the drive mechanism. The drive structure includes a power device such as an engine or an electric motor, which is connected to the root shaft through a coupling or a gearbox to provide rotational power so that the blade 20 generates thrust or lift. During operation, the drive structure transmits power to the root shaft through a drive shaft or a coupling, driving the root shaft to rotate along its own axis. The rotating propeller shaft drives the blades 20 connected thereto to rotate together, thereby generating thrust or lift, pushing or pulling the aircraft or ship forward. The arrangement of the bearing ensures that the propeller shaft rotates smoothly, reduces friction loss, and prolongs the service life of the system.

[0053] It is understandable that the blade 20 is connected to the positioning groove 11 of the root shaft through the positioning block 21. In some embodiments, the positioning groove 11 is designed as an arc structure, and the positioning block 21 is inserted into the positioning groove 11 through the through hole on the side to form a firm mechanical connection. The multi-point contact between the arc groove and the positioning block 21 ensures the stability and reliability of the connection, while enhancing the torsion resistance to prevent the blade 20 from twisting or loosening during high-speed rotation. The root shaft is supported in the hub by bearings. The provision of the bearings reduces the friction between the root shaft and the hub, allowing the root shaft to rotate smoothly and smoothly. The bearings not only improve the smoothness of the rotation, but also reduce vibration and noise, ensuring the long-term stable operation of the system.

[0054] It can be understood that the ball bearing consists of an inner ring, an outer ring, a steel ball and a retaining cage. The inner ring is fixedly connected to the propeller shaft, and the outer ring is connected to the hub. The rolling body rolls between the inner ring and the outer ring, reducing the rotational friction of the propeller shaft. The ball bearing is installed inside the hub to support and guide the rotation of the propeller shaft, so that the propeller shaft can rotate smoothly under low friction conditions. When the propeller shaft rotates, the inner ring of the ball bearing rotates with the propeller shaft, while the outer ring is fixed to the hub and does not move. The rolling body rolls between the inner and outer rings, reducing the friction generated during the rotation process and making the rotation of the propeller shaft smoother. The ball bearing effectively reduces the friction when the propeller shaft rotates by rolling the rolling body between the inner and outer rings. Compared with sliding friction, rolling friction is small and energy loss is small, thereby improving the rotation efficiency of the system.

[0055] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A connection structure for a propeller, characterized in that: include: A pulp root shaft, wherein a positioning groove is provided on the end surface of the pulp root shaft; The blade has a positioning block at its root, and the positioning block is engaged with the positioning groove.

2. The connection structure for a propeller according to claim 1, characterized in that: The outer circumferential surface of the pulp root shaft is provided with a through opening, and along the radial direction of the pulp root shaft, one side of the positioning groove is connected with the outer circumferential surface of the pulp root shaft via the through opening, and the positioning block can be inserted into the positioning groove from the through opening and be engaged with the positioning groove.

3. The connection structure for a propeller according to claim 2, characterized in that: The propeller further includes a limiting member, which is connected to the through-hole and limits the blade along the radial direction.

4. The connection structure for a propeller according to claim 3, characterized in that: The limiting member is a limiting plate, and the pulp root shaft is provided with a strip groove along its axial direction, the strip groove intersects with the through opening, and the limiting plate can be inserted into the strip groove from the side of the strip groove away from the blade, and the limiting plate is connected to the pulp root shaft by bolts.

5. The connection structure for a propeller according to claim 4, characterized in that: Along a cross section perpendicular to the axial direction, the positioning groove has an arc-shaped structure.

6. The connection structure for a propeller according to claim 1, characterized in that: Along the direction from the notch opening to the bottom of the positioning groove, the cross-sectional area of ​​the positioning groove gradually increases, and the outer peripheral surface of the positioning block abuts against the groove wall of the positioning groove.

7. The connection structure for a propeller according to claim 6, characterized in that: A chamfer is provided at the connection between the groove wall and the groove bottom of the positioning groove.

8. The connection structure for a propeller according to claim 6, characterized in that: The positioning block includes a top surface, a bottom surface, and a first side surface, a second side surface, a third side surface, a fourth side surface, and a fifth side surface arranged around the top surface and the bottom surface, wherein the first side surface and the second side surface have a first angle therebetween, the fourth side surface and the fifth side surface have the first angle therebetween, and the third side surface has a second angle with the second side surface and the fourth side surface, respectively.

9. A propeller, characterized in that: include: A connection structure for a propeller according to any one of claims 1 to 8; A propeller hub, wherein a bearing is provided on the propeller hub, and the propeller root shaft is connected to the bearing; A driving mechanism is connected to the pulp root shaft in driving relationship, and is used to drive the pulp root shaft to rotate along its own axis.

10. The propeller according to claim 9, characterized in that The bearing is a ball bearing.

Images