An interlocking structure of a torsion arm of an automatic tilting device and a paddle main shaft

Abstract

The utility model discloses a kind of interlocking structure of automatic tilting device torsion arm and paddle main shaft connection, specifically related to paddle main shaft connection structure technical field, including main shaft body, interlocking linkage assembly is arranged on the main shaft body, the interlocking linkage assembly includes the connecting seat of being arranged in the top of main shaft body, the both ends of the connecting seat are respectively rotationally connected with docking shaft.The utility model discloses by interlocking linkage assembly, discard the design idea of traditional single bolt locking.Using the cooperative transmission of top ring, traction linkage plate, telescopic adjusting rod, realize the mechanical bite type locking of locking sleeve to docking shaft, form the integrated locking mechanism of thread transmission, lever linkage and mechanical interlocking.Even if slight wear or tiny looseness of part assembly appears in long-term use process, the constraint relationship of each linkage component can still maintain connection stability, effectively avoid the failure risk of stationary ring slip, swing, etc., ensure the accuracy of operating command transmission.

Description

Technical Field

[0001] This utility model relates to the technical field of blade main shaft connection structure, and more specifically, to an interlocking structure for connecting the torque arm of an automatic tilter to the blade main shaft. Background Technology

[0002] As the core control component of the helicopter rotor system, the swashplate's anti-torque arm (also known as the stabilizer arm or anti-torque arm) is a crucial foundational component for ensuring flight safety, directly determining the accuracy and reliability of control command transmission. The core function of the anti-torque arm is to establish and maintain the absolute static reference of the swashplate's "stationary ring" (outer ring), resisting the risks of uncommanded rotation caused by rotor torque, airflow disturbances, and airframe vibrations. During helicopter flight, the pilot's attitude control commands must be precisely transmitted to the rotating ring through the stationary ring, thereby driving the rotor blades to adjust the flight attitude. If the connection between the anti-torque arm and the rotor shaft fails, the stationary ring will slip, wobble, or drift, leading to distorted control commands, delayed transmission, or even reverse output. This severely weakens the pilot's control over the helicopter, easily triggering flight accidents during critical flight phases such as takeoff, landing, and hovering, posing a fatal threat to the lives of the crew and the integrity of the equipment.

[0003] Currently, the industry commonly uses bolts and anti-loosening nuts to connect the anti-torsion arm to the rotor shaft. The principle is that the axial clamping force after the bolts are pre-tightened locks the anti-torsion arm to the shaft surface, forming a rigid connection. However, this structure has inherent and difficult-to-overcome defects: on the one hand, continuous vibration, temperature cycling, and airflow impact during helicopter flight gradually weaken the thread engagement pre-tightening force of the bolts and nuts, leading to loosening of the connection; on the other hand, even if the nut only slightly loosens and does not completely fall off, it will directly disrupt the locked state between the anti-torsion arm and the shaft, causing the rigid connection to fail and the stationary ring to lose its stable reference. Furthermore, the anti-loosening reliability of the bolt-locking structure depends on the precision of the installation process. Problems such as insufficient torque, thread damage, or foreign object residue during installation can cause problems. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides an interlocking structure for connecting the torque arm of the automatic tilter and the main shaft of the blade, which aims to solve the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: an interlocking structure for connecting the torque arm of an automatic tilter to the main shaft of the blade, including a main shaft body, on which an interlocking linkage component is provided; The interlocking linkage assembly includes a connecting seat disposed on the top of the main shaft, with docking shafts rotatably connected to both ends of the connecting seat, and a locking sleeve sleeved on the outer side of each docking shaft, with an extension block fixedly disposed at the end of the locking sleeve away from the connecting seat; A traction linkage plate is sleeved on the outer side of the main shaft, and a traction rod is fixedly installed on the outer side of the locking sleeve; The connecting seat has an inner liner embedded in it, and the top two sides of the main shaft are respectively provided with side-sinking positioning grooves so that the outer side of the bolt is embedded in the side-sinking positioning groove to position the inner liner and the connecting seat.

[0006] Optionally, in one possible implementation, the interlocking linkage assembly further includes a first telescopic adjusting rod disposed at one end of the traction rod, and a plurality of hinge seats disposed on the outer side of the traction linkage plate. The two ends of the first telescopic adjusting rod extend to the traction rod and the hinge seats respectively. The traction rod and the hinge seats are both hinged to the first telescopic adjusting rod. A second telescopic adjusting rod is hinged to the outer side of the traction linkage plate. A hinge rod is hinged to the top of the second telescopic adjusting rod. One end of the hinge rod extends to the bottom of the connecting seat and is hinged to the connecting seat. The hinge rod limits the vertical displacement of the traction linkage plate, so that when the traction linkage plate moves up and down, the second telescopic adjusting rod is linked to pull the hinge rod to deflect. Optionally, in one possible implementation, a top ring is threadedly connected to the outer side of the main shaft. The top ring is located at the bottom of the traction linkage plate, and the top of the top ring extends to the bottom of the traction linkage plate and is movably connected to the traction linkage plate. Rotating the top ring causes the traction linkage plate to move upward, thereby driving the first telescopic adjustment rod and the first telescopic adjustment rod to rotate the extension block, so that the extension block rotates axially along the connection between the locking sleeve and the connecting seat. One end of the extension block is provided with an installation groove, and a blade is provided in the installation groove.

[0007] The technical effects and advantages of this utility model are as follows: The interlocking linkage components eliminate the traditional single-bolt locking design. Through the coordinated transmission of the top ring, traction linkage plate, and telescopic adjustment rod, a mechanical engagement locking mechanism is achieved between the locking sleeve and the mating shaft, forming an integrated locking mechanism of threaded transmission, lever linkage, and mechanical interlocking. Even if some components experience slight wear or minor loosening during long-term use, the constraint relationship of each linkage component maintains connection stability, effectively avoiding the risk of failure such as slippage or wobbling of the stationary ring, ensuring the accuracy of control command transmission. This structural design eliminates the safety hazards caused by traditional bolt loosening, significantly improving the helicopter's flight safety under complex operating conditions. The traction linkage plate can be smoothly displaced by rotating the top ring. This, in turn, drives the locking sleeves on both sides to apply force evenly via the first telescopic adjustment rod, resulting in a tighter fit and more balanced force distribution between the locking sleeves and the mating shaft. This avoids the localized stress concentration problem that easily occurs with traditional bolt locking. Simultaneously, the design of the second telescopic adjustment rod in conjunction with the hinge rod precisely limits the displacement trajectory of the traction linkage plate, ensuring the stability and repeatability of the locking process. This not only meets the normal load requirements of helicopter flight but also withstands the impact loads under complex conditions such as extreme airflow and severe vibration, significantly improving the fatigue resistance and service life of the connection structure. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0009] Figure 1 This is a front view of the overall structure of this utility model.

[0010] Figure 2 This is a side view of the overall structure of this utility model.

[0011] Figure 3 This is a schematic diagram of the locking sleeve, extension block, traction rod, and first telescopic adjustment rod of this utility model.

[0012] Figure 4 This is a schematic diagram of the main shaft, connecting seat, top ring, and docking shaft of this utility model.

[0013] Figure 5 This is a schematic diagram of the traction linkage plate, the second telescopic adjustment rod, and the hinge rod of this utility model.

[0014] Figure 6 This is a schematic diagram of the main shaft, inner liner, and side-sinking positioning groove of this utility model. The attached figures are labeled as follows: 1. Main shaft; 2. Connecting seat; 3. Docking shaft; 4. Locking sleeve; 5. Extension block; 6. Traction linkage plate; 7. Traction rod; 8. First telescopic adjustment rod; 9. Second telescopic adjustment rod; 10. Hinge rod; 11. Top ring; 12. Blade; 13. Inner liner seat; 14. Side sinking positioning groove. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] Example 1 This embodiment discloses an interlocking structure for connecting the automatic swashplate torsion arm and the propeller shaft, which aims to solve the problem in the prior art where bolts and anti-reverse nuts are used to lock the anti-torsion arm and the propeller shaft, resulting in the failure of the rigid connection due to nut loosening and affecting flight safety.

[0017] Specifically, the interlocking structure connecting the automatic tilter torque arm and the blade main shaft in this embodiment includes a main shaft body 1, on which an interlocking linkage component is provided. The interlocking linkage component enables a stable connection between the torque arm and the blade main shaft, avoiding safety hazards caused by the failure of a single locking structure.

[0018] The interlocking linkage assembly includes a connecting seat 2 located at the top of the spindle body 1, such as... Figure 4 As shown, the two ends of the connecting seat 2 are rotatably connected to the mating shafts 3 via bearings, and each mating shaft 3 is fitted with a locking sleeve 4 on its outer side. The locking sleeve 4 and the mating shaft 3 are initially fixed by an interference fit. An extension block 5 is integrally formed at the end of the locking sleeve 4 away from the connecting seat 2, such as... Figure 3 As shown, the extension block 5 extends outward along the radial direction of the locking sleeve 4. One end of the extension block 5 is provided with an installation groove, and a blade 12 is fixedly installed in the installation groove by bolts. The connection surface between the blade 12 and the extension block 5 is provided with an anti-slip pad to enhance the connection stability.

[0019] A traction linkage plate 6 is sleeved on the outer side of the main spindle body 1. The traction linkage plate 6 has a ring structure, and its inner diameter is adapted to the outer diameter of the main spindle body 1. It can slide up and down along the axial direction of the main spindle body 1. Figure 3 As shown, a traction rod 7 is welded and fixed to the outside of the locking sleeve 4; The connecting seat 2 has an inner liner seat 13 embedded inside. The top two sides of the main shaft body 1 are respectively provided with side-sinking positioning grooves 14 so that the outer side of the bolt is embedded in the side-sinking positioning groove 14 to position the inner liner seat 13 and the connecting seat 2. Example 2 Based on Embodiment 1, the interlocking linkage assembly in this embodiment further includes a first telescopic adjustment rod 8 disposed at one end of the traction rod 7, and a number of hinge seats are evenly distributed on the outer side of the traction linkage plate 6. The number of hinge seats is the same as the number of traction rods 7. In this embodiment, it is preferred to have 2 hinge seats, which are symmetrically disposed on both sides of the traction linkage plate 6.

[0020] The two ends of the first telescopic adjustment rod 8 extend to the traction rod 7 and the hinge seat, respectively. The traction rod 7 and the hinge seat are both hinged to the first telescopic adjustment rod 8 through pins. The first telescopic adjustment rod 8 can adjust its length according to the displacement of the traction linkage plate 6, thereby causing the traction rod 7 to deflect.

[0021] like Figure 5As shown, a second telescopic adjusting rod 9 is also hinged to the outside of the traction linkage plate 6. The second telescopic adjusting rod 9 and the first telescopic adjusting rod 8 are staggered. A hinge rod 10 is hinged to the top of the second telescopic adjusting rod 9. One end of the hinge rod 10 extends to the bottom of the connecting seat 2 and is hinged to the connecting seat 2 through a hinge shaft. The hinge rod 10 limits the vertical displacement of the traction linkage plate 6, so that when the traction linkage plate 6 moves up and down, the second telescopic adjusting rod 9 is linked to pull the hinge rod 10 to deflect around the hinge shaft at the bottom of the connecting seat 2, thus ensuring the stability and accuracy of the displacement of the traction linkage plate 6.

[0022] like Figure 4 As shown, a top ring 11 is threadedly connected to the outer side of the main shaft 1. The top ring 11 is located at the bottom of the traction linkage plate 6. The inner wall of the top ring 11 is provided with an internal thread, and the corresponding position of the main shaft 1 is provided with an external thread. The two threads are engaged to realize the vertical displacement adjustment of the top ring 11. The top of the top ring 11 extends to the bottom of the traction linkage plate 6 and is movably connected to the traction linkage plate 6. The top of the top ring 11 is provided with an anti-slip contact surface, which fits against the bottom of the traction linkage plate 6 to avoid relative sliding.

[0023] The specific working principle is as follows: When connecting and installing the automatic tilter torque arm and the blade main shaft, firstly, the connecting seat 2 is fixedly installed on the top of the main shaft body 1, then the docking shaft 3 is rotatably connected to both ends of the connecting seat 2, and a locking sleeve 4 is fitted on the outside of the docking shaft 3 to ensure that the locking sleeve 4 and the docking shaft 3 are properly interference-fitted. After that, the blade 12 is fixed in the mounting groove of the extension block 5 with bolts to complete the initial installation of the blade.

[0024] Subsequently, the traction linkage plate 6 is fitted onto the outside of the main shaft 1, and the hinged connection between the first telescopic adjustment rod 8 and the traction rod 7 and the hinged seat of the traction linkage plate 6 is completed in sequence, as well as the hinged connection between the second telescopic adjustment rod 9 and the traction linkage plate 6 and the hinged rod 10, to ensure that each hinge rotates flexibly without any jamming.

[0025] Finally, the top ring 11 is threaded onto the outside of the main shaft 1 and located at the bottom of the traction linkage plate 6. The top ring 11 is rotated using a wrench or other tools. Due to the threaded fit between the top ring 11 and the main shaft 1, the top ring 11 is rotated and moves upward along the axial direction of the main shaft 1. The top of the top ring 11 pushes the traction linkage plate 6 to move upward synchronously. During the upward movement of the traction linkage plate 6, on the one hand, the first telescopic adjustment rod 8 pulls the traction rod 7, which in turn drives the locking sleeve 4 to rotate axially around the connection between the docking shaft 3 and the connecting seat 2, so that the locking sleeve 4 further locks the docking shaft 3, realizing the rigid connection between the blade 12 and the main shaft 1. On the other hand, when the traction linkage plate 6 moves upward, the second telescopic adjustment rod 9 pulls the hinge rod 10 to deflect around the hinge axis at the bottom of the connecting seat 2. The limiting effect of the hinge rod 10 ensures the stability of the displacement of the traction linkage plate 6, thereby ensuring that the locking force of the locking sleeve 4 is uniform and reliable.

[0026] When disassembly or adjustment is required, rotate the top ring 11 in the reverse direction. The top ring 11 moves downward along the axis of the main shaft 1. The traction linkage plate 6 moves downward under its own weight and the reset action of the first telescopic adjustment rod 8 and the second telescopic adjustment rod 9. The locking sleeve 4 releases the locking state of the mating shaft 3, and subsequent disassembly or adjustment operations can be carried out.

[0027] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An interlocking structure for connecting the torque arm of an automatic swashplate to the main shaft of a blade, comprising a main shaft body (1), characterized in that: An interlocking linkage assembly is provided on the main shaft (1); The interlocking linkage assembly includes a connecting seat (2) set on the top of the main shaft (1), with docking shafts (3) rotatably connected to both ends of the connecting seat (2), and locking sleeves (4) sleeved on the outer side of each docking shaft (3), with an extension block (5) fixedly provided at the end of the locking sleeve (4) away from the connecting seat (2). A traction linkage plate (6) is sleeved on the outside of the main shaft (1), and a traction rod (7) is fixedly installed on the outside of the locking sleeve (4). The connecting seat (2) has an inner liner seat (13) embedded inside. The top two sides of the main shaft (1) are respectively provided with side sinking positioning grooves (14) so ​​that the outer side of the bolt is embedded in the side sinking positioning groove (14) to position the inner liner seat (13) and the connecting seat (2).

2. The interlocking structure for connecting the torque arm of an automatic swashplate and the main shaft of the blade, as described in claim 1, is characterized in that: The interlocking linkage assembly also includes a first telescopic adjustment rod (8) disposed at one end of the traction rod (7), and several hinge seats are disposed on the outer side of the traction linkage plate (6).

3. The interlocking structure for connecting the torque arm of an automatic swashplate and the main shaft of the blade, as described in claim 2, is characterized in that: The two ends of the first telescopic adjustment rod (8) extend to the traction rod (7) and the hinge seat respectively, and the traction rod (7) and the hinge seat are both hinged to the first telescopic adjustment rod (8).

4. The interlocking structure for connecting the torque arm of an automatic swashplate and the main shaft of the blade, as described in claim 1, is characterized in that: The outer side of the traction linkage plate (6) is hinged with a second telescopic adjustment rod (9), and the top of the second telescopic adjustment rod (9) is hinged with a hinge rod (10).

5. The interlocking structure for connecting the torque arm of an automatic swashplate and the main shaft of the blade, as described in claim 4, is characterized in that: One end of the hinge rod (10) extends to the bottom of the connecting seat (2) and is hinged to the connecting seat (2). The hinge rod (10) limits the vertical displacement of the traction linkage plate (6), so that when the traction linkage plate (6) moves up and down, the second telescopic adjustment rod (9) is linked to pull the hinge rod (10) to deflect.

6. The interlocking structure for connecting the torque arm of an automatic swashplate and the main shaft of the blade as described in claim 1, characterized in that: The outer side of the main shaft (1) is threaded with a top ring (11), which is located at the bottom of the traction linkage plate (6).

7. The interlocking structure for connecting the torque arm of an automatic swashplate and the main shaft of the blade as described in claim 6, characterized in that: The top of the top ring (11) extends to the bottom of the traction linkage plate (6) and is movably connected to the traction linkage plate (6). The traction linkage plate (6) is moved upward by rotating the top ring (11), which in turn drives the first telescopic adjustment rod (8) and the first telescopic adjustment rod (8) to drive the extension block (5) to rotate, so that the extension block (5) rotates and adjusts axially along the connection between the locking sleeve (4) and the connecting seat (2).

8. The interlocking structure for connecting the torque arm of an automatic swashplate and the main shaft of the blade as described in claim 1, characterized in that: One end of the extension block (5) is provided with an installation groove, and a blade (12) is provided in the installation groove.

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