Auxiliary tool for dismounting and mounting propeller hub
By designing auxiliary tools for torque multiplier and coaxial sleeve assembly, the problem of expensive or damaged thread removal of large helicopter spindle nuts is solved, achieving a low-cost and efficient disassembly effect.
Patent Information
- Application Number
- CN202510816523.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-18
- Publication Date
- 2025-08-22
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing helicopter spindle large nut removal tools are expensive or prone to thread damage.
An auxiliary tool including a torque multiplier, a first sleeve assembly and a second sleeve assembly is designed to ensure coaxiality during screwing, avoid thread damage, and remove through simple operating steps.
It realizes low-cost and efficient disassembly of the spindle large nut, avoids thread damage, is simple to operate and inexpensive.
Smart Images
Figure CN120516627A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of auxiliary tools for helicopters, in particular to an auxiliary tool for disassembling and installing a propeller hub. Background Art
[0002] A large nut (called a spindle nut or swivel nut) is screwed onto the main shaft of a helicopter's main rotor hub. To ensure secure installation, this nut is extremely difficult to remove. Currently, these removal tools typically consist of a hydraulic torque wrench with a reaction arm, a customized split-type hydraulic nut remover (such as the Bell series), or a specialized wrench and locking tool (such as the Robinson R44). However, effective removal equipment (which minimizes thread damage) is very expensive, while low-cost equipment is ineffective (inconvenient to use and prone to thread damage). Summary of the Invention
[0003] The purpose of the present invention is to overcome the shortcomings of the prior art, provide an auxiliary tool for disassembling and installing the hub, and solve the problem that the existing auxiliary tools for disassembling the main shaft and the large nut are expensive or easily cause damage to the threads of the main shaft and the large nut.
[0004] The object of the present invention is achieved through the following technical solution: an auxiliary tool for disassembling and installing a propeller hub, comprising: A torque multiplier having a torque cylinder with a planetary gear mechanism disposed therein, an input shaft connected to the planetary gear mechanism disposed at one end of the torque cylinder, and an output shaft connected to the planetary gear mechanism disposed at the other end of the torque cylinder; A torque wrench is sleeved on the input shaft; The output shaft is provided with a first sleeve assembly, which is circumferentially screwed with a plurality of tightening screws; the first sleeve assembly is sleeved on the top of the main shaft of the helicopter main rotor hub, and the tightening screws are tightened to abut against the cylindrical surface of the main shaft; The torque cylinder is sleeved with a second sleeve assembly, the lower end of which has a structure adapted to the large nut of the helicopter hub; the second sleeve assembly has a structure capable of sliding along the axial direction of the torque cylinder, and the two cannot rotate circumferentially; The first sleeve assembly and the output shaft can be quickly inserted into the axial connection and can be quickly separated axially; the second sleeve assembly and the torque cylinder can be quickly inserted into the axial connection and can be quickly separated axially; the first sleeve assembly and the second sleeve assembly can be separately installed on the corresponding main shaft and large nut.
[0005] As the preferred technical solution of the present application, the first sleeve assembly includes a first disc claw member and a first sleeve; the first disc claw member is a disc, which has a plurality of first protrusions circumferentially at the edge of the lower surface of the disc, and a polygonal hole A adapted to the output shaft at the center of the disc; the first sleeve is a cylinder, which has a plurality of first notches adapted to the first protrusions at the upper end of the cylinder; the lower end of the cylinder is circumferentially threadedly equipped with a plurality of tightening screws.
[0006] As a preferred technical solution of the present application, the second sleeve assembly includes a second sleeve; the inner diameter of the second sleeve is larger than the outer diameter of the first sleeve assembly, forming a structure in which the first sleeve assembly will not interfere with the axial sliding of the second sleeve; the inner wall of the upper part of the second sleeve has a plurality of ridges, and the torque tube has corresponding recessed grooves; when the second sleeve is sleeved on the torque tube and slides axially, the ridges slide along the recessed grooves, forming a structure that can slide axially but cannot rotate circumferentially; the lower end of the second sleeve assembly has an installation structure that is adapted to the large nut of the helicopter's main rotor hub.
[0007] Furthermore, the second sleeve has a plurality of second protrusions at its lower end. The second sleeve assembly also includes a second auxiliary member; a plurality of second notches are formed on the edge of the second auxiliary member, which are adapted to fit the second protrusions; and a polygonal hole B is formed in the center of the second auxiliary member, which is adapted to fit the large nut of the helicopter's main rotor hub.
[0008] Furthermore, the lower end of the torque tube has a downwardly extending small-diameter tube.
[0009] Furthermore, the second sleeve is provided with a handle that can be unfolded and retracted.
[0010] The present invention has the following advantages: (1) The entire auxiliary tool structure is very simple and the cost is very low; (2) The torque multiplier ensures that a sufficiently large torque can be applied so that the large nut can be removed smoothly. (3) Since the first sleeve assembly and the second sleeve assembly are coaxially arranged and assembled on the corresponding main shaft and large nut before screwing, the coaxial output shaft and torque cylinder on the torque multiplier are correspondingly docked with the first sleeve assembly and the second sleeve assembly, thereby ensuring the coaxiality between the torque multiplier and the first sleeve assembly and the second sleeve assembly (when screwing, the force is mainly applied at the docking point between the torque multiplier and the first sleeve assembly and the second sleeve assembly. If the direction of the force is incorrect during screwing, a certain position adjustment can be made at the docking point). This method makes it difficult for the thread between the main shaft and the large nut to be damaged during screwing; (4) Since the first sleeve assembly and the second sleeve assembly are first fixed on the corresponding main shaft and the large nut, and then the torque multiplier is axially inserted to carry out subsequent work, the assembly is relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 Schematic diagram of the structure with the large nut assembled on the main shaft of the helicopter's main rotor hub; Figure 2 This is a schematic structural diagram of the present invention (the second auxiliary component is not shown); Figure 3 It is a schematic diagram of the explosion structure of the present invention; Figure 4 is a structural schematic diagram of the first sleeve assembly and the torque multiplier; Figure 5 is a structural schematic diagram of the second sleeve assembly and the torque multiplier; Figure 6 Schematic diagram of the structure of the second sleeve; Figure 7 This is a schematic diagram of the structure in which the second auxiliary component is sleeved outside the large nut; In the figure: 10-torque multiplier, 11-input shaft, 12-output shaft, 13-small diameter cylinder, 20-torque wrench, 30-first sleeve assembly, 31-tightening screw, 32-first disc claw, 3201-first protrusion, 33-first sleeve, 3301-first notch, 40-second sleeve assembly, 41-second sleeve, 4101-convex strip, 4102-second protrusion, 42-second auxiliary component, 4201-polygonal hole B, 4202-second notch, 43-handle. DETAILED DESCRIPTION
[0012] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.
[0013] It should be noted that the directions or positional relationships indicated by “left”, “right”, etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the invented product is usually placed when in use, or are the directions or positional relationships commonly understood by those skilled in the art. Such terms are only used to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0014] In the existing related technologies, such as Figure 1As shown, a large nut (called a spindle nut or swivel nut) is screwed onto the main shaft of a helicopter's main rotor hub. To ensure secure installation, this nut is extremely difficult to remove. Currently, these removal tools typically consist of a hydraulic torque wrench with a reaction arm, a customized split-type hydraulic nut remover (such as the Bell series), or a specialized wrench and locking tool (such as the Robinson R44). However, effective removal equipment (which minimizes thread damage) is very expensive, while low-cost equipment is ineffective (inconvenient to use and prone to thread damage).
[0015] In order to solve the above problems, a solution is provided, and a wrench structure is designed: (1) sufficient torque is ensured by a torque multiplier; (2) the coaxial first sleeve assembly and the second sleeve assembly are respectively matched with the main shaft of the helicopter main rotor hub and the large nut to ensure the coaxiality of the two when twisting, thereby avoiding damage to the thread (improving the disassembly effect); (3) by allowing a part of the first sleeve assembly and the second sleeve assembly to be fixedly matched with the corresponding main shaft and the large nut, and then axially inserted, the twisting work can be carried out, which is more convenient to operate.
[0016] The above ideas are further illustrated below using specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the present invention can be combined with each other.
[0017] like Figure 2-Figure 7 As shown, the auxiliary tool for disassembly and installation of the hub includes a torque multiplier 10, a first sleeve assembly 30, and a second sleeve assembly 40; The torque multiplier 10 includes a torque cylinder, a planetary gear mechanism disposed within the torque cylinder, an input shaft 11 disposed at one end of the torque cylinder (the input shaft 11 is drivably connected to the planetary gear mechanism), and an output shaft 12 disposed at the other end of the torque cylinder (the input shaft 12 is drivably connected to the planetary gear mechanism). It should be noted that the entire torque multiplier 10 is prior art, and the structure described here is for the convenience of subsequent writing. A torque wrench 20 is sleeved on the input shaft 11. The torque wrench 20 is conventional and can adjust the torque. A ratchet is provided inside the torque wrench. When the torque wrench is rotated back and forth, the torque wrench can be rotated only in the clockwise direction (or only in the counterclockwise direction). The torque wrench 20 has a direction toggle. When the direction toggle is turned, the torque wrench can be switched back and forth between clockwise and counterclockwise directions. The first sleeve assembly 30 is mounted on the lower end of the output shaft 12 , and a plurality of tightening screws 31 are screwed circumferentially on the first sleeve assembly 30 ; The second sleeve assembly 40 is sleeved on the torque cylinder and has a structure that can slide axially along the torque cylinder and cannot rotate circumferentially. The lower end of the second sleeve assembly 40 has a structure that adapts to the large nut of the helicopter hub. In addition, the inner diameter of the second sleeve assembly 40 is larger than the outer diameter of the first sleeve assembly 30. When the second sleeve assembly 40 slides axially, the first sleeve assembly 30 will not form an obstruction. Furthermore, the first sleeve assembly 30 and the output shaft 12 can be quickly inserted into and axially aligned with each other, and can be quickly separated from each other axially. The second sleeve assembly 40 and the torque cylinder can be quickly inserted into and axially aligned with each other, and can be quickly separated from each other axially. The first sleeve assembly 30 and the second sleeve assembly 40 can be separately installed on the corresponding main shaft and large nut. In addition, a handle 43 is provided on the second sleeve assembly 40; During operation: ① Put the first sleeve assembly 30 on the top of the main shaft of the helicopter main rotor hub, then tighten the tightening screw 31 and let the tightening screw 31 rest on the cylindrical surface of the main shaft, so that the first sleeve assembly 30 is installed and fixed with the main shaft; ② Then put the second sleeve assembly 40 on the large nut; ③ Then axially insert the torque multiplier 10, and during the insertion process, use the torque wrench 20 to rotate the input shaft 11 (adjust the position angle between the input shaft 11 and the torque cylinder, that is, adjust the angle between the input shaft 12 and the torque cylinder), so that the output shaft 12 can be plugged and docked with the first sleeve assembly 30, and the torque cylinder can be plugged and docked with the second sleeve assembly 40; ④ Then hold the handle 43 with one hand and turn the torque wrench 20 with the other hand to pin the large nut from the main shaft.
[0018] It should be noted that: (1) the structure of the entire auxiliary tool is very simple and the cost is very low; (2) the torque multiplier 10 ensures that a sufficiently large torque can be applied, so that the large nut can be removed smoothly; (3) since the first sleeve assembly 30 and the second sleeve assembly 40 are coaxially arranged and assembled on the corresponding main shaft and the large nut before being screwed, the coaxial output shaft 12 and the torque cylinder on the torque multiplier 10 are correspondingly docked with the first sleeve assembly 30 and the second sleeve assembly 40, thereby ensuring that the torque multiplier 10 and the first sleeve assembly are coaxially arranged and assembled on the corresponding main shaft and the large nut before being screwed. The coaxiality between the first sleeve assembly 30 and the second sleeve assembly 40 (when twisting, the force is mainly applied at the joint between the torque multiplier 10 and the first sleeve assembly 30 and the second sleeve assembly 40. If the direction is wrong when twisting, the position can be adjusted to a certain extent at the joint). This method makes it difficult for the threads between the main shaft and the large nut to be damaged during twisting; (4) Since the first sleeve assembly 30 and the second sleeve assembly 40 are first fixed on the corresponding main shaft and large nut, and then the torque multiplier 10 is axially inserted to carry out subsequent work, the assembly is relatively simple.
[0019] The first sleeve assembly 30 is further described below.
[0020] like Figure 3 and Figure 4 As shown, the first sleeve assembly 30 includes a first disc claw 32, a first sleeve 33, and a tightening screw 31; The first disc claw member 32 is a circular disc having a plurality of first protrusions 3201 circumferentially formed at the edge of its lower surface. The disc and the plurality of first protrusions 3201 are mechanically processed to form an integral structure. Furthermore, a polygonal hole A is formed at the center of the disc, which is adapted to fit the output shaft 12. The first sleeve 33 is a cylinder with a plurality of first notches 3301 circumferentially formed at the upper end thereof, the first notches 3301 being adapted to fit with the first protrusions 3201 ; in addition, a plurality of tightening screws 31 are circumferentially threadedly assembled at the lower end thereof.
[0021] When installing the first sleeve assembly 30: first, put the lower end of the first sleeve 33 on the upper end of the main shaft of the helicopter main rotor hub, and then tighten the tightening screw 31 to lock it; then place the first disc claw 32 on the top of the first sleeve 33, and let the first protrusion 3201 fit with the first notch 3301; then install the torque multiplier 10 on the first disc claw 32 - that is, let the output shaft 12 be inserted into the polygonal hole A of the disc.
[0022] The second sleeve assembly 40 is further described below.
[0023] like Figure 5 、 Figure 6 and Figure 7 As shown, the second sleeve assembly 40 includes a second sleeve 41 and a second auxiliary member 42; The inner diameter of the second sleeve 41 is larger than the outer diameter of the first sleeve assembly 30, so that the first sleeve assembly 30 does not interfere with the axial sliding of the second sleeve 41. Furthermore, the inner wall of the upper portion of the second sleeve 41 has a plurality of ridges 4101, and the torque barrel has corresponding recessed grooves. When the second sleeve 41 is sleeved on the torque barrel and slides axially, the ridges 4101 slide along the recessed grooves, forming a structure that allows axial sliding but not circumferential rotation. Furthermore, a plurality of second protrusions 4102 are formed on the lower end of the second sleeve 41. Among them, multiple second notches 4202 are opened on the edge of the second auxiliary part 42, and the second notches 4201 are adapted to the second protrusions 4101; there is a polygonal hole B4201 in the center of the second auxiliary part 42, and the polygonal hole B4201 is adapted to the large nut of the helicopter main rotor hub.
[0024] The structure of the torque multiplier 10 is further optimized below.
[0025] like Figure 1 、 Figure 2 and Figure 3 As shown, a small-diameter cylinder 13 is provided at the lower end of the torque cylinder, allowing the output shaft 12 to extend from the small-diameter cylinder 13 ; a recessed groove is provided on the small-diameter cylinder 13 , allowing the second sleeve 41 to be fitted onto the small-diameter cylinder 13 .
[0026] The above embodiments merely represent preferred implementations, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art will be able to make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.
Claims
1. Auxiliary tool for disassembly and installation of propeller hub, characterized by: include: A torque multiplier (10) having a torque cylinder, a planetary gear mechanism disposed within the torque cylinder, an input shaft (11) connected to the planetary gear mechanism disposed at one end of the torque cylinder, and an output shaft (12) connected to the planetary gear mechanism disposed at the other end of the torque cylinder; A torque wrench (20) is sleeved on the input shaft (11); The output shaft (12) is provided with a first sleeve assembly (30), and a plurality of tightening screws (31) are screwed circumferentially on the first sleeve assembly (30); the first sleeve assembly (30) is sleeved on the top end of the main shaft of the helicopter main rotor hub, and the tightening screws (31) are tightened and abut against the cylindrical surface of the main shaft; A second sleeve assembly (40) is sleeved on the torque cylinder, and the lower end of the second sleeve assembly (40) has a structure adapted to the large nut of the helicopter hub; the second sleeve assembly (40) has a structure capable of sliding along the axial direction of the torque cylinder, and the two cannot rotate circumferentially; The first sleeve assembly (30) and the output shaft (12) can be quickly inserted into each other in an axially aligned manner and can be quickly separated in an axially aligned manner; the second sleeve assembly (40) and the torque cylinder can be quickly inserted into each other in an axially aligned manner and can be quickly separated in an axially aligned manner; the first sleeve assembly (30) and the second sleeve assembly (40) can be separately mounted on the corresponding main shaft and large nut.
2. The auxiliary tool for disassembly and installation of a propeller hub according to claim 1, characterized in that: The first sleeve assembly (30) comprises a first disc claw member (32) and a first sleeve (33); The first disc claw member (32) is a disc having a plurality of first protrusions (3201) circumferentially at the edge of the lower surface of the disc, and a polygonal hole A adapted to the output shaft (12) at the center of the disc; The first sleeve (33) is a cylinder having a plurality of first notches (3301) adapted to the first protrusions (3201) at the upper end of the cylinder; a plurality of tightening screws (31) are circumferentially threadedly assembled at the lower end of the cylinder.
3. The auxiliary tool for disassembly and installation of a propeller hub according to claim 1 or 2, characterized in that: The second sleeve assembly (40) comprises a second sleeve (41); The inner diameter of the second sleeve (41) is greater than the outer diameter of the first sleeve assembly (30), forming a structure in which the first sleeve assembly (30) does not interfere with the axial sliding of the second sleeve (41); The inner wall of the upper portion of the second sleeve (41) is provided with a plurality of convex strips (4101), and the torque cylinder is provided with corresponding concave grooves; when the second sleeve (41) is sleeved on the torque cylinder and slides axially, the convex strips (4101) slide along the concave grooves, forming a structure that can slide axially but cannot rotate circumferentially; The lower end of the second sleeve assembly (40) has a mounting structure adapted to the large nut of the helicopter main rotor hub.
4. The auxiliary tool for disassembly and installation of a propeller hub according to claim 3, characterized in that: The lower end of the second sleeve (41) is provided with a plurality of second protrusions (4102); The second sleeve assembly (40) further includes a second auxiliary component (42); A plurality of second notches (4202) are provided at the edge of the second auxiliary part (42), and the second notches (4201) are adapted to the second protrusions (4101); a polygonal hole B (4201) is provided at the center of the second auxiliary part (42), and the polygonal hole B (4201) is adapted to the large nut of the main rotor hub of the helicopter.
5. The auxiliary tool for disassembly and installation of a propeller hub according to claim 3, characterized in that: The lower end of the torque cylinder has a downwardly extending small-diameter cylinder (13), and a recessed groove is formed on the small-diameter cylinder (13); the second sleeve (41) is sleeved on the small-diameter cylinder (13).
6. The auxiliary tool for disassembly and installation of a propeller hub according to claim 3, characterized in that: The second sleeve (41) is provided with a handle (43) that can be unfolded and retracted.