Coaxiality design process technology optimization method and device

Abstract

The invention belongs to the field of transmission adjustment, and relates to a coaxiality design process technology optimization method and device. The method comprises the following steps: in order to enable the tail thrust assembly to be theoretically vertical to a transmission shaft, mounting an integral inclined gasket on a mounting surface of the tail thrust assembly so as to compensate a mounting angle of the tail thrust assembly and a gap between structures;

Description

Technical Field

[0001] The invention belongs to the field of transmission adjustment and relates to a method and a device for optimizing coaxiality design process technology. Background Art

[0002] When adjusting the coaxiality of a certain type of aircraft transmission system, the assembly requires that the angular deviation values ​​of the diaphragm coupling at the main reducer tail transmission outlet, tail shaft bearing support, and tail thrust input must all meet the requirement of α≤±6'. The current existing installation process is to adjust the adjustment gasket under the bearing support ( Figure 1 ) thickness to adjust the tail transmission shaft system.

[0003] However, when two of the three diaphragm couplings have angular deviations that are out of tolerance, every time the adjustment shim under the bearing support is adjusted to make one of the diaphragm couplings meet the design requirements, the thickness adjustment requirements of the adjustment shims under the bearing support of the other two diaphragm couplings are exactly the opposite, resulting in the inability to adjust the above three angular deviations to the qualified range at the same time. The need to install shims at the tail thrust assembly requires repeated trial assembly and adjustment, resulting in a large amount of repeated adjustment work, and a large amount of rework delays the assembly progress and affects the assembly quality. Summary of the invention

[0004] Purpose of the invention: To optimize the process of coaxiality adjustment of a certain type of tail drive shaft, so as to solve the difficulty of unqualified coaxiality adjustment, avoid a lot of rework in the entire adjustment process, reduce the difficulty of adjustment, effectively improve assembly efficiency, and ensure production progress.

[0005] Technical Solution

[0006] In a first aspect, a method for optimizing a coaxiality design process technology is provided, comprising:

[0007] In order to make the tail thrust assembly and the transmission shaft reach theoretical perpendicularity, an integral inclined gasket is installed on the mounting surface of the tail thrust assembly to compensate for the installation angle of the tail thrust assembly and the gap between the structures.

[0008] Furthermore, the thickness y of the overall oblique gasket is calculated as follows: y = A tan(x′);

[0009] Wherein, x′ is the theoretical value of the angular deviation of the tail thrust assembly; A is the radius from the mounting bolt to the transmission center.

[0010] Further, an integral oblique gasket is mounted on the mounting surface of the tail thrust assembly, including:

[0011] Use the engine coaxiality inspection device to detect the deviation direction between the tail thrust assembly and the transmission shaft;

[0012] Install the integral oblique gasket on the mounting surface of the tail thrust assembly along the deviation direction.

[0013] Furthermore, the method further comprises:

[0014] The measured value of the angular deviation of the diaphragm coupling at the bearing support is obtained by measurement;

[0015] The measured value is taken as the theoretical value of the angular deviation of the tail thrust assembly.

[0016] In a second aspect, a coaxiality design process technology optimization device is provided, comprising:

[0017] The compensation module is used to install an integral oblique gasket on the mounting surface of the tail thrust assembly to compensate for the installation angle of the tail thrust assembly and the gap between the structures so as to make the tail thrust assembly and the transmission shaft reach theoretical perpendicularity.

[0018] Furthermore, the thickness y of the overall oblique gasket is calculated as follows: y = A tan(x′);

[0019] Wherein, x′ is the theoretical value of the angular deviation of the tail thrust assembly; A is the radius from the mounting bolt to the transmission center.

[0020] Furthermore, the compensation device is specifically used for:

[0021] Use the engine coaxiality inspection device to detect the deviation direction between the tail thrust assembly and the transmission shaft;

[0022] Install the integral oblique gasket on the mounting surface of the tail thrust assembly along the deviation direction.

[0023] Furthermore, the device also includes:

[0024] The measuring module is used to measure the actual value of the angular deviation of the diaphragm coupling at the bearing support, and use the actual value as the theoretical value of the angular deviation of the tail thrust assembly.

[0025] Beneficial effects:

[0026] After optimization, the workload of adjusting the tail drive shaft is reduced to a great extent. After adding the gasket, the method of adjusting the axial length of the tail rear shaft is carried out according to the adjustment method of the tail front shaft, which achieves the effect of ensuring the qualified adjustment of the angular deviation.

[0027] The present invention solidifies the process method of adding adjustment pads and calculating the thickness of the adjustment pads, which can be used as a reference and basis for improving adjustment parts, adjustment methods, and adding adjustment points to meet design requirements when the coaxiality adjustment of other models cannot meet design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of an integral oblique gasket;

[0029] Figure 2 is a schematic diagram of the connection between the transmission shaft and the tail thrust assembly;

[0030] Among them, 1- tail drive shaft output flange, 2- diaphragm coupling and connector, 3- tail thrust assembly input flange, 4- tail thrust assembly installation plane;

[0031] Figure 3 Schematic diagram of using integral bevel shims to compensate for angular deviation. DETAILED DESCRIPTION

[0032] The present invention designs a coaxiality adjustment for a transmission system of a certain type of aircraft. In order to avoid mechanical failures that threaten flight safety, such as fuselage vibration, laminated coupling deflection, and shaft flexural deformation caused by coaxiality deviation of the shaft system during installation, it is necessary to ensure that the angular deviation of the diaphragm coupling of the tail drive shaft system is qualified during installation.

[0033] like Figure 2 As shown, through adjustment data analysis, since the transmission system can only adjust the angular deviation of the tail drive shaft by adjusting the thickness of the gasket under the bearing support, the on-site situation is that two of the three diaphragm couplings have angular deviations that are out of tolerance. Whenever the adjusting gasket under the bearing support is adjusted to make one of the diaphragm couplings meet the design requirements, the other two diaphragm couplings have exactly the opposite adjustment requirements for the thickness of the adjusting gasket under the bearing support, resulting in an inability to adjust.

[0034] like Figure 3 As shown, the analysis of the existing installation method: after on-site inspection and analysis, the main reason for the angular deviation exceeding the tolerance is that when the tail drive shaft system is installed, the angular deviation at the diaphragm coupling assembly is affected by the structural installation. Since the tail end of the fuselage and the main structure of the fuselage are subsequently docked and installed, the docking error of the fuselage tail beam is accumulated and reflected in the coaxiality adjustment, and the axis deviation between the tail thrust assembly and the main reducer output shaft flange is too large. It is manifested as the angular deviation of the three diaphragm couplings exceeding the tolerance. According to the existing method of adjusting the thickness of the adjustment gasket only under the bearing support, the angular deviation of the three diaphragm couplings of the tail drive shaft cannot be qualified, so it is necessary to improve the adjustment method to compensate for the structural angle error.

[0035] A new installation method is invented: an integral oblique gasket is added between the tail thrust assembly and the structure to improve the installation angle of the tail thrust assembly and eliminate the gap between the structure, thereby ensuring that the angular deviation of the diaphragm coupling of the tail drive shaft is adjusted to a qualified standard. In order to make the tail thrust assembly and the drive shaft reach theoretical verticality, the installation bolt is measured to the transmission center radius A, and the theoretical value of the angular deviation of the tail thrust assembly is x', so the tail thrust assembly needs to increase the thickness of the adjustment gasket y in the corresponding direction, tan (x') = y / A, by calculating the specific size of the adjustment oblique gasket, and installing the adjustment oblique gasket between the installation plane of the tail thrust assembly and the structure, the installation inclination angle of the tail thrust assembly is compensated, so that the center axis of the tail thrust assembly is parallel to the axis of the tail drive shaft, and the drive shaft assembly is connected to the tail thrust input flange through the diaphragm coupling assembly. Through the adjustment of the oblique gasket, the torsion and winding deformation of the diaphragm coupling are reduced, so that the coaxiality of the tail drive shaft is adjusted to a qualified range.

[0036] Example 1

[0037] 1. Through calculation, the dimension from the tail drive shaft bearing support to the mounting surface of the tail thrust assembly of a certain type of aircraft is approximately 2075mm, and the radius from the mounting bolt of the tail thrust assembly to the transmission center is 155mm.

[0038] 2. The actual measured value of the angular deviation of the diaphragm coupling at the bearing support is x′, and the theoretical value of the angular deviation of the tail thrust assembly is x′.

[0039] 3. Add the thickness y of the adjustment gasket in the corresponding direction of the tail thrust assembly. In order to make the tail thrust assembly and the transmission shaft reach theoretical perpendicularity, tan(x′)=y / 155 must be satisfied, and then the thickness of the adjustment gasket of the tail thrust assembly at the bolt installation radius is obtained.

[0040] 4. Add 1.5mm thickness to the calculated thickness of the adjusting gasket to ensure that the inclined gasket can be processed, and then the specific size of the adjusting gasket is obtained.

[0041] 5. Install the adjusting slant gasket between the tail thrust assembly and the structure to ensure that the angular deviation of the tail drive shaft diaphragm coupling is qualified.

[0042] The present invention provides a coaxiality design process technology optimization device, comprising:

[0043] The compensation module is used to install an integral oblique gasket on the mounting surface of the tail thrust assembly to compensate for the installation angle of the tail thrust assembly and the gap between the structures so as to make the tail thrust assembly and the transmission shaft reach theoretical perpendicularity.

[0044] Furthermore, the thickness y of the overall oblique gasket is calculated as follows: y = A tan(x′);

[0045] Wherein, x′ is the theoretical value of the angular deviation of the tail thrust assembly; A is the radius from the mounting bolt to the transmission center.

[0046] Furthermore, the compensation device is specifically used for:

[0047] Use the engine coaxiality inspection device to detect the deviation direction between the tail thrust assembly and the transmission shaft;

[0048] Install the integral oblique gasket on the mounting surface of the tail thrust assembly along the deviation direction.

[0049] Furthermore, the device also includes:

[0050] The measuring module is used to measure the actual value of the angular deviation of the diaphragm coupling at the bearing support, and use the actual value as the theoretical value of the angular deviation of the tail thrust assembly.

Claims

1. A coaxiality design process technology optimization method, characterized in that: include: In order to make the tail thrust assembly and the transmission shaft reach theoretical perpendicularity, an integral inclined gasket is installed on the mounting surface of the tail thrust assembly to compensate for the installation angle of the tail thrust assembly and the gap between the structures.

2. The optimization method according to claim 1, characterized in that: The calculation formula of the thickness y of the integral oblique gasket is: y = A tan(x′); Wherein, x′ is the theoretical value of the angular deviation of the tail thrust assembly; A is the radius from the mounting bolt to the transmission center.

3. The optimization method according to claim 1, characterized in that: Install an integral angled spacer onto the mounting surface of the thrust assembly, including: Use the engine coaxiality inspection device to detect the deviation direction between the tail thrust assembly and the transmission shaft; Install the integral oblique gasket on the mounting surface of the tail thrust assembly along the deviation direction.

4. The optimization method according to claim 2, characterized in that: The method further comprises: The measured value of the angular deviation of the diaphragm coupling at the bearing support is obtained by measurement; The measured value is taken as the theoretical value of the angular deviation of the tail thrust assembly.

5. A coaxiality design process technology optimization device, characterized in that: include: The compensation module is used to install an integral oblique gasket on the mounting surface of the tail thrust assembly to compensate for the installation angle of the tail thrust assembly and the gap between the structures so as to make the tail thrust assembly and the transmission shaft reach theoretical perpendicularity.

6. The optimization device according to claim 5, characterized in that: The calculation formula of the thickness y of the integral oblique gasket is: y = A tan(x′); Wherein, x′ is the theoretical value of the angular deviation of the tail thrust assembly; A is the radius from the mounting bolt to the transmission center.

7. The optimization device according to claim 5, characterized in that: The compensation device is specifically used for: Use the engine coaxiality inspection device to detect the deviation direction between the tail thrust assembly and the transmission shaft; Install the integral oblique gasket on the mounting surface of the tail thrust assembly along the deviation direction.

8. The optimization device according to claim 6, characterized in that: The device also includes: The measuring module is used to measure the actual value of the angular deviation of the diaphragm coupling at the bearing support, and use the actual value as the theoretical value of the angular deviation of the tail thrust assembly.

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