Large-tightness pressing tool and method for helicopter inner rotor shaft bearing

Abstract

The invention belongs to the technical field of aviation assembly, and discloses a high-tightness pressing tool and method for a helicopter inner rotor shaft bearing, and the tool comprises a quick-change disc assembly, a servo press module, an inner rotor shaft locking assembly and an inner rotor bearing pressing tool. The quick-change disc assembly is used for connecting the whole tool to an external execution mechanism; the servo press module provides press-fitting power; the inner rotor shaft locking assembly is used for locking a workpiece, and the inner rotor bearing pressing tool is used for pressing a bearing. The key innovation lies in that the components are coaxially connected through the supporting frame, so that pressure and counter-acting force generated during press fitting form a closed force flow loop in the tool, internal force balance is achieved, and the requirement for the strength of an external supporting structure of equipment is greatly lowered. In addition, the press-fitting precision is ensured through servo closed-loop control, and the press-fitting quality, the automation level and the operation convenience are remarkably improved through the quick-change interface and the floating fault-tolerant design.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aviation assembly, and particularly relates to a large-tightness pressing tool and method for a main rotor shaft bearing of a helicopter. BACKGROUND

[0002] The main speed reducer of a helicopter is a core component of a power transmission system, and the installation quality of the inner rotor shaft bearing thereof is directly related to the reliability, service life and flight safety of the entire transmission system. The bearing is usually installed on a shaft shoulder in a large interference fit (i.e., "large tightness" pressing) manner to ensure that, under high-speed and large-load working conditions, the bearing and the shaft will not slide or micro-move relative to each other.

[0003] At present, in the field of aviation manufacturing, such key interference fit bearings are usually installed by using a hydraulic or servo press in cooperation with a special tool. The traditional pressing tool scheme usually designs the inner rotor shaft positioning tool and the bearing pressing tool as two independent parts. The typical installation process is as follows: first, the inner rotor shaft itself is positioned and fastened on a support platform by using one tool; then, another independent pressing head tool is used to apply pressure to the bearing from top to bottom by a press to press the bearing to the specified position on the shaft.

[0004] This traditional split tool scheme has the following significant disadvantages: 1. Complex structure and high precision requirement: The two independent tool components need to be manufactured separately, and the relative position accuracy between them and between them and the press and the support platform is extremely high. Any small centering error may cause a bias torque during pressing, which may scratch the precision fit surface of the bearing or the shaft, or even cause the bearing to be stuck or the internal raceway to be damaged during pressing, resulting in expensive part scrap.

[0005] 2. Huge external support load: During pressing, the bearing pressing tool applies a downward pressing force (Fpress), and according to Newton's third law, the inner rotor shaft will generate an upward reaction force (Fback) of the same size through its positioning tool to the support platform below. This means that the huge pressing force will be completely transmitted to the external support structure (such as the workbench or the rack). In order to withstand the huge load of this repeated action, the support structure must be designed to be extremely strong and heavy, which not only increases the equipment manufacturing cost, but also occupies valuable production space.

[0006] 3. Insufficient control accuracy during pressing: For some non-servo controlled presses, the pressing process mainly relies on displacement control, and the monitoring of pressure is mostly open-loop or pre-warning type, making it difficult to achieve precise real-time closed-loop control of pressing force and displacement. In large interference fit assembly, the pressing force-displacement curve is a key indicator for judging the assembly quality, and the control accuracy of the traditional method cannot fully meet the requirements of the highest aviation standards.

[0007] 4. Low degree of automation and flexibility: split tooling is usually installed and positioned by mechanical means such as bolts, and when changing product models, the tooling switching time is long, the adjustment is complicated, and it is difficult to adapt to the needs of modern flexible production lines, affecting the overall assembly efficiency.

[0008] Therefore, there is an urgent need in the art for a new compression tooling and method that can solve the precision, rigidity, efficiency and control problems caused by the above-mentioned split tooling, and achieve high-quality, high-efficiency and high-reliability compression of the inner rotor shaft bearing of a helicopter. SUMMARY

[0009] The present application aims to provide a large-tightness compression tooling and method for the inner rotor shaft bearing of a helicopter to solve the above technical problems.

[0010] To solve the above technical problems, the specific technical scheme of the large-tightness compression tooling and method for the inner rotor shaft bearing of a helicopter of the present application is as follows: A large-tightness compression tooling for the inner rotor shaft bearing of a helicopter, comprising a quick-change disc assembly, a servo press module, an inner rotor shaft locking assembly and an inner rotor bearing compression tooling, the quick-change disc assembly is used to suspend and connect the entire tooling to external equipment, the quick-change disc assembly and the servo press module are connected through a zero position locator, the inner rotor shaft locking assembly and the inner rotor bearing compression tooling are coaxially fixedly connected with the servo press module through a support frame, the servo press module applies pressure to the inner rotor shaft through the inner rotor bearing compression tooling, the inner rotor shaft locking assembly is used to lock the inner rotor shaft and bear the counter pressure of the inner rotor shaft through the support frame, the pressure and the counter force form a closed force flow circuit inside the tooling, and they cancel each other out.

[0011] Further, the quick-change disc assembly comprises a tooling docking quick-change disc, a quick-change welding frame one, a zero position locator female head and a servo press assembly quick-change disc male head, the tooling docking quick-change disc is fixedly installed above the quick-change welding frame one, the zero position locator female head and the servo press assembly quick-change disc male head are fixedly installed on one side of the quick-change welding frame one, the tooling docking quick-change disc is used to connect with external robots or truss actuators, the zero position locator female head is connected with the zero position locator male head of the servo press module to realize precise positioning of the quick-change disc assembly and the servo press module, and the servo press assembly quick-change disc male head realizes connection and quick-change function with the servo press module.

[0012] Further, the tooling docking quick-change disc and the servo press assembly quick-change disc male head are integrated with an electrical interface and an air interface, the electrical interface supplies power and communicates for components in the servo press module, and the air interface supplies air for the zero position locator and meets the air supply needs of subsequent expanded products.

[0013] Further, the servo press module comprises a servo press, a guide shaft, a quick-change welded frame two, a zero point locator male head, a servo press assembly quick-change disc female head, a press mounting frame, a linear bearing, a tool mounting frame and a servo motor, the servo press is installed on the press mounting frame, the servo motor is connected with the servo press and is used for driving the servo press to work, the quick-change welded frame two is fixedly installed on one side of the press mounting frame, the zero point locator male head and the servo press assembly quick-change disc female head are installed on one side of the quick-change welded frame two, the zero point locator male head is connected with the zero point locator female head of the quick-change disc assembly, the accurate positioning of the servo press module and the quick-change disc assembly is realized, the servo press assembly quick-change disc female head is connected with the servo press assembly quick-change disc male head of the quick-change disc assembly, the connection and quick change of the servo press module and the quick-change disc assembly are realized, the guide shaft is fixed on the upper part of both ends of the tool mounting frame, the guide shaft passes through the through holes of both ends of the press mounting frame and is connected through the linear bearing, the press mounting frame and the tool mounting frame are movably connected through the guide shaft, and the support frame of the inner rotor shaft locking assembly and the inner rotor shaft bearing pressing tool is formed.

[0014] Further, the inner rotor shaft locking assembly comprises a tool transmission shaft, a transmission shaft bushing, a transmission shaft guide sleeve and an inner rotor shaft locking tool, the transmission shaft bushing passes through the upper end of the tool transmission shaft in the transverse direction, the tool transmission shaft is fixedly connected to the press mounting frame through the transmission shaft bushing, the lower end of the tool transmission shaft passes through the bottom of the press mounting frame through the transmission shaft guide sleeve, the end of the inner rotor shaft locking tool is provided with a thread connected with the inner rotor shaft, and the upper end is provided with a through hole through which the tool transmission shaft passes, and the tool transmission shaft passes through the through hole of the inner rotor shaft locking tool through the pressing of the servo press.

[0015] Further, the size of the through hole in the top part of the inner rotor shaft locking tool is greater than the outer diameter size of the tool transmission shaft.

[0016] Further, the upper end of the inner rotor shaft bearing pressing tool is fixedly connected with the tool mounting frame, the servo press provides the pressing force for the tool mounting frame, and the lower end is in contact with the bearing of the inner rotor shaft to realize the pressing of the bearing.

[0017] The application also discloses a large-tightness pressing method for a helicopter inner rotor shaft bearing. Step 1: install the tool to the external actuator through the quick-change disc assembly; Step 2: connect the inner rotor shaft locking tool with the inner rotor shaft through the thread; Step 3: pass the tool transmission shaft through the through hole in the top part of the inner rotor shaft locking tool, and adjust the centering by the size difference between the through hole and the shaft; Step 4: Start the servo press, apply pressure to the bearing through the inner rotor shaft bearing compression tool, and exert a counterforce on the inner rotor shaft locking assembly to balance the force inside the tool. Step 5: Real-time monitoring and adjustment of the compression force and displacement through closed-loop control of the servo press to ensure the quality of the compression.

[0018] The large-tightness compression tool and method for the inner rotor shaft bearing of a helicopter have the following advantages: 1. Internal force balance is achieved, significantly reducing the requirements for external structure The present application co-axially connects the servo press module, the inner rotor shaft locking assembly, and the bearing compression tool through the support frame, so that the downward compression force generated by the bearing compression tool and the upward counterforce generated by the inner rotor shaft locking assembly form a closed force flow circuit inside the tool during the compression process, which means that the huge compression force is no longer transmitted to the external support platform or frame, thereby greatly reducing the strength and rigidity requirements of the workbench, foundation, and other external support structures, saving equipment manufacturing costs and space.

[0019] 2. Improved compression centering accuracy and assembly quality The tool adopts integrated coaxial design, which structurally ensures the coaxiality of the acting force and the counterforce during the compression process, effectively avoiding the off-load torque caused by centering errors. Combined with the guide shaft and linear bearing in the servo press module, the motion accuracy of the compression process is further ensured. This fundamentally prevents problems such as bearing raceway and mating surface scratches or compression jamming caused by off-load, significantly improves the compression success rate and assembly quality, and reduces the risk of part scrap.

[0020] 3. Realize precise closed-loop control of the compression process The servo press is equipped with integrated pressure and displacement sensors, which can monitor and feedback the compression force and displacement in real time, achieving precise real-time closed-loop control. This allows the operator to accurately obtain and control the compression force-displacement curve, which is a key indicator directly related to the assembly quality of large interference fit, thereby fully meeting the requirements of the highest aviation standards for control accuracy during assembly.

[0021] 4. Improve the automation and flexibility level of the tool By setting the quick-change disc assembly and zero-point positioning system, the entire tool can be quickly and accurately connected and replaced with external robots or trusses and other actuators. Integrated electrical and pneumatic interfaces enable quick connection of power and signals. This modular and quick-change design greatly shortens the tool adjustment and preparation time when switching between product models, and is very suitable for the needs of modern flexible production lines, improving overall assembly efficiency.

[0022] 5. Optimized human-computer operation and fault-tolerant design. The through-hole design at the top of the internal rotor shaft locking fixture is larger than the outer diameter of the drive shaft, providing vertical allowance. This ingenious fault-tolerant design allows for compensation by vertical movement when there is circumferential angular deviation in the threaded connection, ensuring that the drive shaft can pass smoothly. This reduces the difficulty of operation and the stringent requirements on the operator's skill level, improving the convenience and reliability of operation.

[0023] In summary, this invention not only solves the problems of precision, rigidity, efficiency, and control inherent in traditional split-type tooling, but also achieves high-quality, high-efficiency, high-reliability, and high-flexibility press-fitting of helicopter internal rotor shaft bearings through innovative designs such as integrated force balance, servo closed-loop control, and quick-change interfaces, resulting in significant comprehensive benefits. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the high-tightness clamping fixture structure for the internal rotor shaft bearing of the helicopter engine according to the present invention. Figure 2 This is a schematic diagram of the quick-change disc assembly structure of the present invention; Figure 3 This is a schematic diagram of the servo press module structure of the present invention; Figure 4 This is a schematic diagram of the internal rotor shaft locking assembly structure of the present invention; Figure 5 This is a cross-sectional view of the tooling of the present invention; The markings in the diagram are as follows: 1. Quick-change disc assembly; 2. Servo press module; 3. Inner rotor shaft locking assembly; 4. Inner rotor bearing clamping fixture; 5. Fixture docking quick-change disc; 6. Quick-change welding bracket one; 7. Zero-point positioner female head; 8. Servo press assembly quick-change disc male head; 9. Servo press; 10. Guide shaft; 11. Quick-change welding bracket two; 12. Zero-point positioner male head; 13. Press mounting bracket; 14. Linear bearing; 15. Fixture mounting bracket; 16. Servo motor; 17. Fixture drive shaft; 18. Drive shaft bushing; 19. Drive shaft guide sleeve; 20. Inner rotor shaft locking fixture; 51. Servo press assembly quick-change disc female head. Detailed Implementation

[0025] To better understand the purpose, structure, and function of this invention, the following detailed description, in conjunction with the accompanying drawings, provides a high-tightness clamping fixture and method for a helicopter internal rotor shaft bearing.

[0026] The application discloses a large-tightness pressing tool for a main rotor shaft bearing of a helicopter, which comprises a quick-change disc assembly 1, a servo press module 2, an inner rotor shaft locking assembly 3 and an inner rotor shaft bearing pressing tool 4, the quick-change disc assembly 1 is used for suspending and connecting the whole tool to external equipment, the quick-change disc assembly 1 and the servo press module 2 are connected through a zero-point positioner, the inner rotor shaft locking assembly 3 and the inner rotor shaft bearing pressing tool 4 are coaxially fixedly connected with the servo press module 2 through a support frame. The servo press module 2 applies pressure to the inner rotor shaft through the inner rotor shaft bearing pressing assembly 4, the inner rotor shaft locking assembly 3 is used for locking the inner rotor shaft and bearing the counter pressure of the inner rotor shaft through the support frame, and the pressure and the counter force form a closed force flow loop in the tool and are cancelled out.

[0027] The quick-change disc assembly 1 comprises a tool butt-joint quick-change disc 5, a quick-change welding frame one 6, a zero-point positioner female head 7 and a servo press assembly quick-change disc male head 8, the tool butt-joint quick-change disc 5 is fixedly installed above the quick-change welding frame one 6, and the zero-point positioner female head 7 and the servo press assembly quick-change disc male head 8 are fixed on one side of the quick-change welding frame one 6. The tool butt-joint quick-change disc 5 is used for being connected with an external robot or a truss and the like executing mechanism, and meets the connection and quick-change functions of the large-torque tightening tool. The zero-point positioner female head 7 is connected with a zero-point positioner male head 12 of the servo press module 2, precise positioning of the quick-change disc assembly 1 and the servo press module 2 is realized, the servo press assembly quick-change disc male head 8 realizes the connection and quick-change functions of the servo press module 2. The tool butt-joint quick-change disc 5 and the servo press assembly quick-change disc male head 8 are integrated with an electric interface and an air interface, the electric interface can supply power and communicate for components in the servo press module 2, and the air interface supplies air for the zero-point positioner and meets the air supply requirements of subsequent extended products.

[0028] The servo press module 2 comprises a servo press 9, a guide shaft 10, a quick-change welding frame two 11, a zero position locator male head 12, a servo press assembly quick-change disc female head 51, a press mounting frame 13, a linear bearing 14, a tool mounting frame 15, and a servo motor 16. The servo press 9 is mounted on the press mounting frame 13, and the servo motor 16 is connected with the servo press 9 for driving the servo press 9 to work. The quick-change welding frame two 11 is fixedly mounted on one side of the press mounting frame 13, and the zero position locator male head 12 and the servo press assembly quick-change disc female head 51 are mounted on one side of the quick-change welding frame two 11. The zero position locator male head 12 is connected with the zero position locator female head 7 of the quick-change disc assembly 1 to realize the accurate positioning of the servo press module 2 and the quick-change disc assembly 1. The servo press assembly quick-change disc female head 51 is connected with the servo press assembly quick-change disc male head 8 of the quick-change disc assembly 1 to realize the connection and quick change of the servo press module 2 and the quick-change disc assembly 1. The guide shaft 10 is fixedly arranged on the upper part of both ends of the tool mounting frame 15, penetrates through the through holes of both ends of the press mounting frame 13, and is connected through the linear bearing 14. The press mounting frame 13 and the tool mounting frame 15 are movably connected through the guide shaft to form a support frame for connecting the inner rotor shaft locking assembly 3 and the inner rotor shaft bearing pressing tool 4.

[0029] The inner rotor shaft locking assembly 3 comprises a tool transmission shaft 17, a transmission shaft bushing 18, a transmission shaft guide sleeve 19, and an inner rotor shaft locking tool 20. The transmission shaft bushing 18 penetrates through the upper end of the tool transmission shaft 17 in the transverse direction, and the tool transmission shaft 17 is fixedly connected to the press mounting frame 13 through the transmission shaft bushing 18. The lower end of the tool transmission shaft 17 penetrates through the bottom of the press mounting frame 13 through the transmission shaft guide sleeve 19. The inner rotor shaft locking tool 20 has a thread connected with the inner rotor shaft at the tail end and a through hole for the tool transmission shaft 17 to penetrate through at the upper end. During installation, the inner rotor shaft locking tool 20 is first connected with the inner rotor shaft through the thread, and then the tool transmission shaft 17 penetrates through the through hole of the inner rotor shaft locking tool 20 under the pressing of the servo press 9. This structure can make the reaction force on the inner rotor shaft during bearing pressing transmitted to the support frame through the tool transmission shaft 17.

[0030] The size of the through hole at the top of the inner rotor shaft locking tool 20 is larger than the outer diameter size of the tool transmission shaft 17, so that the tool transmission shaft 17 can float up and down within a certain range by means of the size difference. In this way, when the inner rotor shaft locking tool 20 is connected with the inner rotor shaft, no matter how high the thread is finally rotated to, the angle of the through hole can be adjusted in the upward and downward directions to ensure that the tool transmission shaft 17 can smoothly penetrate through the inner rotor shaft locking tool 20.

[0031] The upper end of the inner rotor bearing pressing tool 4 is fixedly connected with the tool mounting frame 15, the servo press 9 provides a pressing force for the upper end, and the lower end is in abutment with the bearing of the inner rotor shaft to press the bearing. The servo press 9 is connected with the support frame, so that the support frame as a whole will be subjected to an upward force from the inner rotor bearing pressing tool 4, and the force of the inner rotor shaft locking tool 20 on the support frame as a whole is a downward force, so that the pressing force can be balanced inside the large-tightness pressing tool, thereby greatly reducing the structural strength requirement of other support accessories.

[0032] The servo press module 2 is movably connected with the lower inner rotor bearing pressing tool 4 through two linear bearings 14 and two guide shafts 10, so as to ensure the movement accuracy. Meanwhile, the servo press 9 itself has the characteristics of high accuracy and high output force, thereby further ensuring the pressing and mounting effect.

[0033] The present application is a tool which needs to use other actuators (such as trusses, robots, etc.) to install the device to its working position through the quick-change disc assembly 1. The zero-point locator female head 7 and the zero-point locator male head 12 are used to realize the zero-point positioning and quick-change connection of the servo press module 2, and the tool butt-joint quick-change disc 5 and the servo press assembly quick-change disc male head 8 provide power supply, gas supply and communication functions.

[0034] After the whole tool is installed in place, the inner thread at the bottom of the inner rotor shaft locking tool 20 is connected with the outer thread at the end of the inner rotor shaft by manual operation.

[0035] After the connection is completed, the tool transmission shaft 17 is passed through the through hole at the top of the inner rotor shaft locking tool 20. At this time, since the tool transmission shaft 17 and the inner rotor shaft are connected through threads, the phase of the two may not be able to make the tool transmission shaft 17 pass through the through hole at the top of the inner rotor shaft locking tool 20 exactly after the connection is completed, and there may be a certain phase deviation, so it is necessary to adjust the angle of the two to make the hole pass through exactly. Further, in the design, the through hole is made large, and a sufficient gap amount in the vertical direction is reserved, so that when the shaft hole is misaligned, the distance in the vertical direction can be used to compensate for the angle in the circumferential direction by rotating the thread on the inner rotor shaft locking tool 20, and finally the tool transmission shaft 17 passes through the through hole at the top of the inner rotor shaft locking tool 20 exactly.

[0036] After the installation is completed, the servo motor 16 is started to drive the servo press 9, closed-loop control is realized through the torque control of the servo motor 16 itself and the feedback of the pressure displacement sensor in the servo press 16, and the force and position of the press fitting are further ensured, thereby realizing high-precision control. During the press fitting, the inner rotor bearing pressing tool 4 generates a pressing force, and the inner rotor shaft locking tool 20 generates a pulling force, the pressing forces are offset in the tool, and no additional stress is generated on other additional components.

[0037] It is to be understood that the present application is described by way of example only, and that modifications or alterations can be made to the features and embodiments described without departing from the spirit and scope of the application. In addition, modifications can be made to the features and embodiments described to accommodate specific situations and materials without departing from the spirit and scope of the application. Accordingly, the application is not limited to the specific embodiments disclosed herein, but rather, the scope of the application includes all embodiments falling within the scope of the claims.

Claims

1. A large tightness pressing tool for a main rotor shaft bearing of a helicopter, characterized by, Including quick change disc assembly (1), servo press module (2), inner rotor shaft locking assembly (3) and inner rotor shaft bearing pressing tool (4), the quick change disc assembly (1) is used to hang and connect the whole tool to external equipment, the quick change disc assembly (1) and servo press module (2) are connected by zero position locator, the inner rotor shaft locking assembly (3) and inner rotor shaft bearing pressing tool (4) are coaxially fixedly connected with servo press module (2) through support frame, the servo press module (2) exerts pressure on the inner rotor shaft through the inner rotor shaft bearing pressing tool (4), the inner rotor shaft locking assembly (3) is used to lock the inner rotor shaft and bear the counter pressure of the inner rotor shaft through the support frame, and the pressure and the counter force form a closed force flow circuit in the tool, which is mutually cancelled.

2. A high-tightness press tool for a main rotor shaft bearing of a helicopter intorquer according to claim 1, characterized in that, The quick change disc assembly (1) includes tool butt joint quick change disc (5), quick change welding frame one (6), zero position locator female head (7) and servo press assembly quick change disc male head (8), the tool butt joint quick change disc (5) is fixedly installed above the quick change welding frame one (6), the zero position locator female head (7) and the servo press assembly quick change disc male head (8) are fixed on one side of the quick change welding frame one (6), the tool butt joint quick change disc (5) is used to be connected with external robot or truss etc. Executive mechanism, the zero position locator female head (7) is connected with the zero position locator male head (12) of servo press module (2), the accurate positioning of quick change disc assembly (1) and servo press module (2) is realized, and the servo press assembly quick change disc male head (8) realizes the connection and quick change function of servo press module (2).

3. A high-tightness press tool for a main rotor shaft bearing of a helicopter intorquer according to claim 2, characterized in that, The tool butt joint quick change disc (5) and servo press assembly quick change disc male head (8) are integrated with electrical interface and gas interface, the electrical interface is used for power supply communication of components in servo press module (2), and the gas interface is used for gas supply of zero position locator and gas supply demand of subsequent expanded products.

4. A high-tightness press tool for a main rotor shaft bearing of a helicopter intorquer according to claim 2, characterized in that, The servo press module (2) includes a servo press (9), a guide shaft (10), a quick-change welding frame two (11), a zero point locator male head (12), a servo press assembly quick-change disc female head (51), a press mounting frame (13), a linear bearing (14), a tool mounting frame (15) and a servo motor (16), the servo press (9) is installed on the press mounting frame (13), the servo motor (16) is connected with the servo press (9), and the servo motor (16) is used for driving the servo press (9) to work, the quick-change welding frame two (11) is fixedly installed on one side of the press mounting frame (13), the zero point locator male head (12) and the servo press assembly quick-change disc female head (51) are installed on one side of the quick-change welding frame two (11), the zero point locator male head (12) is connected with the zero point locator female head (7) of the quick-change disc assembly (1), precise positioning of the servo press module (2) and the quick-change disc assembly (1) is realized, the servo press assembly quick-change disc female head (51) is connected with the servo press assembly quick-change disc male head (8) of the quick-change disc assembly (1), and connection and quick change of the servo press module (2) and the quick-change disc assembly (1) are realized, the guide shaft (10) is fixedly arranged on the upper portion of both ends of the tool mounting frame (15), the guide shaft (10) passes through the through holes of both ends of the press mounting frame (13) and is connected through the linear bearing (14), the press mounting frame (13) and the tool mounting frame (15) are movably connected through the guide shaft, and the press mounting frame (13) and the tool mounting frame (15) jointly constitute a support frame of the inner rotor shaft locking assembly (3) and the inner rotor shaft bearing pressing tool (4).

5. A high-tightness press tool for a main rotor shaft bearing of a helicopter intorquer according to claim 2, characterized in that, The inner rotor shaft locking assembly (3) includes a tool transmission shaft (17), a transmission shaft bushing (18), a transmission shaft guide sleeve (19) and an inner rotor shaft locking tool (20), the transmission shaft bushing (18) passes through the upper end of the tool transmission shaft (17) in the transverse direction, the tool transmission shaft (17) is fixedly connected to the press mounting frame (13) through the transmission shaft bushing (18), the lower end of the tool transmission shaft (17) passes through the bottom of the press mounting frame (13) through the transmission shaft guide sleeve (19), the end of the inner rotor shaft locking tool (20) is provided with a thread connected with the inner rotor shaft, and the upper end is provided with a through hole through which the tool transmission shaft (17) passes, and the tool transmission shaft (17) passes through the through hole of the inner rotor shaft locking tool (20) under the pressing of the servo press (9).

6. A high-tightness press tool for a main rotor shaft bearing of a helicopter intorquer according to claim 5, characterized in that, The size of the through hole in the top portion of the inner rotor shaft locking tool (20) is greater than the outer diameter size of the tool transmission shaft (17).

7. A high-tightness press tool for a main rotor shaft bearing of a helicopter intorquer according to claim 4, characterized in that, The upper end of the inner rotor shaft bearing pressing tool (4) is fixedly connected with the tool mounting frame (15), the servo press (9) provides pressing force for the inner rotor shaft bearing pressing tool (4), and the lower end of the inner rotor shaft bearing pressing tool (4) is attached to the bearing of the inner rotor shaft to press the bearing.

8. A method of compacting the large tightness of a rotor shaft bearing in a helicopter, using the compacting tool according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: Step 1: installing the tool to the external actuator through the quick-change disc assembly (1); Step 2: connecting the inner rotor shaft locking tool (20) and the inner rotor shaft through the thread; Step 3: passing the tool transmission shaft (17) through the through hole in the top portion of the inner rotor shaft locking tool (20), and adjusting the centering by using the size difference between the through hole and the shaft. Step 4: Start servo press (9), and press the bearing by pressing the tool (4) through the inner rotor bearing, and the inner rotor shaft locking assembly (3) bears the counter force, so as to balance the force in the tool; Step 5: Through the closed-loop control of servo press (9), the pressing force and displacement are monitored and adjusted in real time, so as to ensure the pressing quality.

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