Measurement method for air rudder assembly step difference

Abstract

The invention relates to a method for measuring the step difference of air rudder assembly, and the method comprises the steps: installing a measurement tool on a rudder shaft, and enabling the measurement tool to abut against the end face of an inner bearing; obtaining the initial length h1 of the measurement matching piece; mounting a measurement fitting piece on the measurement tool, and abutting the fitting piece to the end face of the inner taper sleeve; acquiring a test length h2 based on measuring the distance from the end face of the mating part to the end face of the inner bearing; and based on the absolute value of the difference between the initial length h1 and the test length h2 of the measured mating part, obtaining the adjustment step difference. The step difference between the inner bearing and the inner taper sleeve at the moment can be obtained by combining the absolute value of the difference between the test length h2 and the initial length h1 of the fitting piece, the measurement mode is simple, the accurate value of the step difference can be obtained, subsequent installation of an adjusting gasket is facilitated, and the problem that the step difference between the end faces of the two is estimated and measured through manual experience in related technologies is solved. Time and labor are consumed, and a large measurement error is easy to exist.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aircraft general assembly, and in particular to a measurement method for air rudder assembly step difference. BACKGROUND

[0002] In an aircraft control system, the air rudder is a key transmission component, and its assembly accuracy directly affects the sensitivity and reliability of flight control. The air rudder usually contains multi-stage bearing and cone sleeve structure, and the rudder shaft passes through the outer bearing and outer cone sleeve, rocker arm, inner bearing and inner cone sleeve in turn, and the end face of the inner bearing and inner cone sleeve is limited and connected by the lock nut in the axial direction.

[0003] However, in the actual installation process, the cylindrical surface is usually used to abut between the outer bearing and the outer cone sleeve, and the assembly error in the sleeving process is small, while the inner bearing and the inner cone sleeve require more strict axial clamping, so a taper surface assembly structure is needed. In the taper assembly process, there is inevitably a small gap between the inner bearing and the inner cone sleeve, which causes the installation surface of the lock nut to not completely match, ultimately resulting in the air rudder transmission gap not meeting the design index.

[0004] However, in the assembly of the rudder shaft, after the lock nut is installed, the lock nut will block the end face between the inner bearing and the inner cone sleeve, making it difficult for the tester to directly measure the step difference between the inner bearing and the inner cone sleeve. Therefore, the traditional method relies on manual experience estimation to obtain the step difference of the end face, but the step difference estimated by manual estimation has a large error, which easily leads to repeated trial assembly and adjustment, not only consuming time and effort, but also increasing the risk of part wear due to multiple disassembly and assembly, and the measurement result is prone to have a large error due to incomplete matching of parts or external disturbance. Such error will further affect the adjustment of the transmission gap, which may reduce the response speed of the rudder surface, or even cause jamming or control failure, threatening flight safety. SUMMARY

[0005] The embodiment of the present application provides a measurement method for air rudder assembly step difference to solve the technical problem that manual experience estimation is used to measure the step difference of the end face in the related art, which not only consumes time and effort, but also easily has a large measurement error.

[0006] A measurement method for air rudder assembly step difference is provided, which comprises: installing a measurement tool on the rudder shaft, and abutting the measurement tool against the inner bearing end face; obtaining the initial length h1 of the measurement fitting; installing the measurement fitting on the measurement tool, and abutting the fitting against the inner cone sleeve end face; obtaining the test length h2 based on the distance from the end face of the measurement fitting to the end face of the inner bearing; The adjustment step difference is obtained based on the absolute value of the difference between the initial length h1 of the measuring fitting and the test length h2.

[0007] In one embodiment, the measuring tool is mounted on the rudder shaft and abuts against the inner bearing end face, which comprises: After the measuring tool is mounted on the rudder shaft, the first pre-tightening torque is continuously applied to the measuring tool to abut the measuring tool against the inner bearing end face.

[0008] In one embodiment, the first pre-tightening torque is set to 40 N·m.

[0009] In one embodiment, the measuring fitting is mounted on the measuring tool and abuts against the inner cone sleeve end face, which comprises: After the measuring fitting is mounted on the measuring tool, the second pre-tightening torque is continuously applied to the measuring fitting to abut the measuring fitting against the inner cone sleeve end face.

[0010] In one embodiment, the second pre-tightening torque is set to 4 N·m.

[0011] In one embodiment, the measuring tool and the measuring fitting are removed, and the adjustment gasket is mounted on the end face of the inner cone sleeve or the inner bearing based on the adjustment step difference.

[0012] In one embodiment, the measuring method for the assembly step difference of the air rudder further comprises: If the initial length h1 of the measuring fitting is greater than the test length h2, the inner cone sleeve end face is lower than the inner bearing end face, and the adjustment gasket is arranged on the inner cone sleeve end face; If the initial length h1 of the measuring fitting is less than the test length h2, the inner cone sleeve end face is higher than the inner bearing end face, and the adjustment gasket is arranged on the inner bearing end face.

[0013] In one embodiment, the measuring method for the assembly step difference of the air rudder further comprises: After the adjustment gasket is mounted, the stop washer and the locking nut are sequentially mounted on the rudder shaft.

[0014] In one embodiment, the test tool comprises a measuring nut for threadedly connecting with the outer peripheral surface of the rudder shaft and abutting against the inner bearing end face; The measuring fitting comprises an adjustment screw for abutting against the inner cone sleeve end face, and the measuring nut is provided with a screw hole threadedly matched with the adjustment screw.

[0015] In one embodiment, four screw holes are circumferentially and spaced apart on the measuring nut, and four adjustment screws are correspondingly arranged. The test length h2 is selected as the maximum value of the distance between the end face of the adjusting screw and the end face of the inner cone sleeve.

[0016] The technical scheme provided in the application has the beneficial effects that: the measuring tool is abutted against the end face of the inner bearing, and the measuring fitting is abutted against the end face of the inner cone sleeve, so that the inner bearing and the inner cone sleeve continuously maintain the state of abutting against each other in the subsequent measurement process, and the possibility of micro displacement between the inner bearing and the inner cone sleeve and thus the measurement error is reduced; the measuring fitting is installed on the measuring tool until the end face of the measuring fitting is abutted against the end face of the inner cone sleeve, the distance from the end face of the measuring fitting to the end face of the inner bearing is taken as the test length h2, and the step difference between the inner bearing and the inner cone sleeve at this time can be obtained by combining the absolute value of the difference between the test length h2 and the initial length h1 of the fitting, the measurement method is simple, and the accurate value of the step difference can be obtained, thereby facilitating the subsequent installation of the adjusting gasket, and solving the technical problem in the related art that the step difference between the two end faces is estimated by manual experience, which is not only time-consuming and laborious, but also prone to large measurement error.

[0017] The embodiment of the application provides a measurement method for the step difference of an air vane assembly, the step difference value between the inner bearing and the inner cone face is calculated by the measuring tool and the measuring fitting, and therefore, the measurement error of the step difference between the two end faces can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 The schematic diagram of the rudder shaft assembly structure, the measuring tool and the measuring fitting provided in the embodiment of the application; Figure 2 The schematic diagram of the rudder shaft assembly structure provided in the embodiment of the application; Figure 3 The schematic diagram of the rudder shaft end face structure provided in the embodiment of the application; In the figure: 1, rudder shaft; 2, measuring tool; 21, measuring nut; 3, measuring fitting; 31, adjusting screw; 4, inner bearing; 5, inner cone sleeve; 6, rocker arm; 7, stop washer; 8, locking nut; 9, outer bearing; 91, outer cone sleeve. DETAILED DESCRIPTION

[0020] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0021] The embodiment of the present application provides a measurement method for air rudder assembly step difference, which can solve the technical problem that the step difference between two end faces is measured by artificial experience estimation in the related art, which not only consumes time and effort, but also is prone to have a large measurement error.

[0022] With reference to Figure 1 and Figure 2 The measurement method for air rudder assembly step difference provided by the embodiment of the present application comprises the following steps: S1: install the measuring tool 2 on the rudder shaft 1, and make the measuring tool 2 abut against the end face of the inner bearing 4; More specifically, in the embodiment of the present application, the measuring tool 2 is specifically selected as a measuring nut 21, which is used to be threadedly connected with the outer peripheral surface of the rudder shaft 1 and abut against the end face of the inner bearing 4. After the outer bearing 9 and the outer taper sleeve 91, the rocker arm 6, the inner bearing 4, and the inner taper sleeve 5 are sequentially installed on the rudder shaft 1, the rudder shaft 1 is passed through the measuring nut 21 at the end close to the inner bearing 4 and the inner taper sleeve 5, and the measuring nut 21 is tightened, so that the measuring nut 21 abuts against the end face of the inner bearing 4 of the rudder shaft 1, and the measuring nut 21 can temporarily replace the locking nut 8.

[0023] S101: after the measuring tool 2 is installed on the rudder shaft 1, a first pre-tightening torque is continuously applied to the measuring tool 2, so that the measuring tool 2 abuts against the end face of the inner bearing 4.

[0024] In the actual process of measuring the air rudder assembly step difference, although the self-locking performance exists between the measuring nut 21 and the rudder shaft 1, due to the mutual abutting connection relationship between the inner bearing 4, the inner taper sleeve 5, and the measuring nut 21, a small gap may be generated between the measuring nut 21 and the inner bearing 4 due to external force. Therefore, in order to further improve the test precision, the measuring nut 21 and the inner taper sleeve 5 are always in the abutting state, after the measuring nut 21 is installed on the rudder shaft 1, the first pre-tightening torque is continuously applied to the measuring nut 21, the measuring nut 21 is kept in the state of moving towards the inner bearing 4, so that the measuring nut 21 is always in the abutting state with the inner bearing 4.

[0025] More specifically, when the inner bearing 4 and the inner taper sleeve 5 are actually installed, the end of the inner bearing 4 and the inner taper sleeve 5 away from the lock nut 8 is in abutting or clamping relationship with other fixed structures in the air vane structure, so after the inner bearing 4 and the inner taper sleeve 5 are installed, even if the first pre-tightening torque is continuously applied, the inner bearing 4 and the inner taper sleeve 5 will not move relative to the rudder shaft 1 in the axial direction under the support and limitation of the other fixed structures.

[0026] Further, in order to ensure that when the first pre-tightening torque is applied to the measuring nut 21, the measuring nut 21 can be abutted and the structural strength of the inner bearing 4 itself will not be affected, therefore, the first pre-tightening torque needs to be selected according to the structural performance of the inner bearing 4 on the actual rudder shaft 1, in an embodiment of the present application, the first pre-tightening torque is set to 40 N·m, so as to abut the measuring nut 21 and protect the required structural position of the inner bearing 4.

[0027] S2: Obtain the initial length h1 of the measuring fitting 3; More specifically, in an embodiment of the present application, the measuring fitting 3 is set as an adjusting screw 31, before measurement, the length of the adjusting screw 31 is measured by a caliper, so as to obtain the initial length h1, and then the subsequent step difference measurement is facilitated.

[0028] S3: Install the measuring fitting 3 on the measuring tool 2, and abut the fitting to the end face of the inner taper sleeve 5; Referring to Figure 2 and Figure 3 In an embodiment of the present application, a screw hole threadedly matched with the adjusting screw 31 is formed on the measuring nut 21 as a test tool, so that the adjusting screw 31 can be threadedly connected to the screw hole until abutting the end face of the inner taper sleeve 5.

[0029] It should be noted that the position of the screw hole formed on the measuring nut 21 must be located between the inner bearing inner ring and the inner taper sleeve inner ring, so as to ensure that when the adjusting screw 31 is threadedly connected to the screw hole on the measuring nut 21, the adjusting screw 31 can abut the end face of the inner taper sleeve 5.

[0030] S301: After the measuring fitting 3 is installed on the measuring tool 2, a second pre-tightening torque is continuously applied to the measuring fitting 3, so that the measuring fitting 3 is abutted to the end face of the inner taper sleeve 5.

[0031] More specifically, in order to make the adjusting screw 31 always maintain the state of abutting the end face of the inner taper sleeve 5 during the measurement, the second pre-tightening torque is applied to the adjusting screw 31 to make the adjusting screw 31 always maintain the state of being screwed, so as to continuously abut the end face of the inner taper sleeve 5.

[0032] Further, in order to reduce the influence on the position of the inner cone sleeve 5 while keeping the adjusting screw 31 abutting against the end face of the inner cone sleeve 5, the second pre-tightening torque also needs to be selected according to the structural strength of the inner cone sleeve 5. In an embodiment of the present application, the second pre-tightening torque is specifically set to 4 N·m.

[0033] S4: Obtain the test length h2 based on the distance between the end face of the measuring fitting 3 and the end face of the inner bearing 4. More specifically, in actual operation, in order to ensure the measurement accuracy and reliability of the test length h2, the vertical distance between the end face of the measuring fitting 3 and the end face of the inner bearing 4 needs to be systematically obtained. In specific implementation, high-precision vernier calipers or tape measures suitable for the on-site environment should be preferred to meet the measurement requirements under different working conditions. Specifically, the vernier calipers are suitable for measuring the small-range and high-precision end face distance between the end face of the measuring fitting 3 and the end face of the inner bearing 4 in small-size air rudders, while the tape measure is convenient for preliminary calibration of the larger distance between the end face of the measuring fitting 3 and the end face of the inner bearing 4 in large-size air rudders. In operation, the reference end of the measuring tool needs to be accurately positioned on the end face of the adjusting screw 31 away from the inner cone sleeve 5 and extended to the end face of the inner bearing 4 close to the adjusting screw 31 in the axial direction, so as to ensure that the measuring probe is fully attached to the two end faces without inclination deviation. In order to improve the measurement accuracy of the test length h2, the measurement accuracy can also be improved by repeated calibration and multiple readings to obtain the average value, which can effectively eliminate human operation errors, and finally the straight-line distance data is formally defined as the test length h2. This step not only provides a core basis for subsequent step difference adjustment and adjustment pad matching, but also significantly improves the traceability of the assembly process and the rigor of the overall process.

[0034] S5: Obtain the adjusting step difference based on the absolute value of the difference between the initial length h1 of the measuring fitting 3 and the test length h2.

[0035] Since the adjusting screw 31 abuts against the end face of the inner cone sleeve 5, when the inner bearing 4 and the inner cone sleeve 5 are in the same horizontal plane, the distance between the end face of the adjusting screw 31 away from the outer bearing 9 and the outer cone sleeve 91 and the end face of the inner bearing 4 is equal to the initial length h1 of the adjusting screw 31; when there is a step difference between the inner bearing 4 and the inner cone sleeve 5, there is a certain gap between the end faces of the inner bearing 4 and the inner cone sleeve 5 towards the measuring nut 21 and the adjusting screw 31, at this time, the end faces of the inner bearing 4 and the inner cone sleeve 5 are not in the same horizontal plane, and the distance between the end face of the adjusting screw 31 away from the outer bearing 9 and the outer cone sleeve 91 and the end face of the inner bearing 4 has a difference with the initial length h1 of the adjusting screw 31, therefore, by calculating the absolute value of the difference between the initial length h1 of the measuring fitting 3 and the test length h2, the distance of the adjusting screw 31 extending into the end face of the inner bearing 4, i.e. the specific value of the adjusting step difference, can be obtained.

[0036] Further, since the wedge-shaped assembly between the inner bearing 4 and the inner cone sleeve 5 can cause a small gap between the step difference between the inner bearing 4 and the end face of the inner cone sleeve 5, in order to further improve the accuracy of adjusting the step difference, in an embodiment of the present application, four screw holes are arranged on the measuring nut 21 in a circumferential direction, and four adjusting screws 31 are arranged correspondingly, and the four adjusting screws 31 are of the same size. In the actual measurement process, the distance between the end face of the four adjusting screws 31 and the end face of the inner bearing 4 is measured in sequence, and the maximum value of the distance between the end face of the four adjusting screws 31 and the end face of the inner bearing 4 is selected as the test length h2, that is, the maximum gap between the four adjusting screws 31 and the end face of the inner bearing 4 is selected as the test length h2.

[0037] In the subsequent step of installing the adjusting gasket, the adjusting gasket is usually made of flexible materials such as aluminum foil with excellent elasticity and flexibility. Such materials can adaptively deform according to their own stress conditions during actual assembly, thereby effectively adapting to the space adjustment requirements under different working conditions. In order to ensure that the calculation result of the adjusting step difference has wide applicability, the maximum value is selected as the key parameter reference of the test length h2 in the measurement practice. The adjusting step difference derived by this method can fully cover the requirements of different parts between the end faces of the inner bearing 4 and the inner cone sleeve 5 for the step difference. Therefore, this design idea significantly enhances the adaptability of the system to the installation condition requirements of the step difference between different parts of the end faces of the inner bearing 4 and the inner cone sleeve 5, compensates for the small gap at different positions, and ensures that stable and reliable adjusting effect can be achieved at each position of the end faces of the inner bearing 4 and the inner cone sleeve 5.

[0038] S6: Remove the measuring tool 2 and the measuring fitting 3, and install the adjusting gasket on the end face of the inner cone sleeve 5 or the inner bearing 4 based on the adjusting step difference.

[0039] S601: After obtaining the adjusting step difference, in order to ensure the accuracy and safety of the subsequent adjustment process, the first pre-tightening torque and the second pre-tightening torque need to be released, and the adjusting screw 31 and the measuring nut 21 are removed. If the initial length h1 of the measuring fitting 3 is greater than the test length h2, it indicates that the adjusting screw 31 is in a state of extending into the inner bearing 4 and tightly abutting against the end face of the inner cone sleeve 5, and the end face position of the inner cone sleeve 5 is obviously lower than the end face height of the inner bearing 4, indicating that an adjusting gasket with a thickness matching the adjusting step difference needs to be accurately installed on the end face of the inner cone sleeve 5 to compensate for the adjusting step difference and restore the assembly accuracy.

[0040] Conversely, if the initial length h1 of the mating part 3 is less than the test length h2, the end of the adjusting screw 31 in contact with the end face of the inner cone sleeve 5 will be higher than the end face of the inner bearing 4, causing the end face of the inner cone sleeve 5 to be relatively raised, at which time an adjusting washer with a thickness corresponding to the difference in the adjusting step must be placed on the end face of the inner bearing 4, so as to achieve the balance of the step difference between the inner bearing 4 and the inner cone sleeve 5. Through the above steps, not only the difference in the step difference between the inner bearing 4 and the inner cone sleeve 5 is effectively solved, but also the stability of the overall assembly of the air vane is significantly improved, laying a solid foundation for subsequent precise operation.

[0041] S602: After installing the adjusting washer, the stop washer 7 and the locking nut 8 are installed on the vane shaft 1 in sequence.

[0042] After completing the precise installation of the adjusting washer and confirming that the position and thickness thereof meet the requirements of the adjusting step difference, in order to ensure the stability of the vane shaft 1 assembly and the reliability of long-term operation, the installation operation of the stop washer 7 and the locking nut 8 on the vane shaft 1 must be strictly carried out in sequence according to the assembly specification. In specific implementation, the stop washer 7 is first stably sleeved into the predetermined shaft section of the vane shaft 1, and then the locking nut 8 is tightened using a standard torque wrench to achieve reliable axial fixation. This step requires strictness in the operation sequence, and the stop washer 7 must be installed before the locking nut, so as to fully exert its anti-loosening feature and prevent the vane shaft 1 from shifting or vibrating loose under dynamic load. Through this refined installation process, not only the assembly gap is effectively eliminated, but also the overall anti-shock performance and service life of the vane system are significantly improved, providing a solid guarantee for subsequent precise debugging and safe operation.

[0043] In addition, as a reference, in the embodiment of the present application, the measuring nut 21 and the adjusting screw 31 are both made of high-strength steel material with excellent structural strength. In the embodiment of the present application, the measuring nut 21 and the adjusting screw 31 are both made of high-strength steel material, which, with its outstanding structural strength, excellent toughness and excellent corrosion resistance, can effectively improve the service life of the measuring nut 21 and the adjusting screw 31. Its high fatigue resistance ensures that the measuring nut 21 and the adjusting screw 31 maintain long-term stable geometric precision under long-term use, and good wear resistance significantly reduces the risk of surface wear caused by frequent use. In addition, the material also has excellent thermal stability and uniform microstructure, and by comprehensively considering these key material properties, the selected high-strength steel not only meets the long-term use requirements of the measuring nut 21 and the adjusting screw 31, but also improves the reliability and adaptability of the measuring nut 21 and the adjusting screw 31.

[0044] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] It should be noted that in the present application, relational terms such as "first" and "second", and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements includes not only those elements, but also other elements not explicitly listed, or other elements inherent in such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus including the element.

[0046] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A method for measuring the step difference in air rudder assembly, characterized in that, It includes: Install the measuring fixture (2) onto the rudder shaft (1) and make the measuring fixture (2) abut against the end face of the inner bearing (4); Obtain the initial length h1 of the measuring mating part (3); Install the measuring fitting (3) onto the measuring fixture (2) and tighten the fitting against the end face of the inner cone sleeve (5); The test length h2 is obtained based on the distance from the end face of the mating part (3) to the end face of the inner bearing (4); The adjustment step difference is obtained based on the absolute value of the difference between the initial length h1 and the test length h2 of the measuring mating part (3).

2. The method for measuring the step difference in aerodynamic rudder assembly as described in claim 1, characterized in that: Install the measuring fixture (2) onto the rudder shaft (1) and make the measuring fixture (2) abut against the end face of the inner bearing (4), which includes: After the measuring fixture (2) is installed on the rudder shaft (1), the first preload torque is continuously applied to the measuring fixture (2) so that the measuring fixture (2) abuts against the end face of the inner bearing (4).

3. The method for measuring the step difference in aerodynamic rudder assembly as described in claim 2, characterized in that: The first preload torque is set to 40 N·m.

4. The method for measuring the step difference in aerodynamic rudder assembly as described in claim 1, characterized in that: Install the measuring fitting (3) onto the measuring fixture (2) and tighten the fitting against the end face of the inner cone sleeve (5), which includes: After installing the measuring fitting (3) onto the measuring fixture (2), a second preload torque is continuously applied to the measuring fitting (3) so that the measuring fitting (3) abuts against the end face of the inner cone sleeve (5).

5. The method for measuring the step difference in aerodynamic rudder assembly as described in claim 4, characterized in that: The second preload torque is set to 4 N·m.

6. The method for measuring the step difference in air rudder assembly as described in claim 1, characterized in that, It also includes: Remove the measuring fixture (2) and the measuring mating parts (3), and install adjusting shims on the end face of the inner tapered sleeve (5) or the inner bearing (4) based on adjusting the step difference.

7. The method for measuring the step difference in aerodynamic rudder assembly as described in claim 6, characterized in that, Also includes: If the initial length h1 of the measuring mating part (3) is greater than the test length h2, then the end face of the inner tapered sleeve (5) is lower than the end face of the inner bearing (4), and an adjustment shim is set on the end face of the inner tapered sleeve (5); If the initial length h1 of the measuring mating part (3) is less than the test length h2, then the end face of the inner tapered sleeve (5) is higher than the end face of the inner bearing (4), and an adjustment shim is set on the end face of the inner bearing (4).

8. A method for measuring step difference in air rudder assembly as described in claim 6, characterized in that, It also includes: After installing the adjusting shims, install the stop washer (7) and the lock nut (8) on the rudder shaft (1) in sequence.

9. The method for measuring the step difference in aerodynamic rudder assembly as described in claim 1, characterized in that: The test fixture includes a measuring nut (21), which is used to connect to the outer circumferential surface of the rudder shaft (1) by thread and to abut against the end face of the inner bearing (4); The measuring fitting (3) includes an adjusting screw (31), which is used to abut against the end face of the inner cone sleeve (5), and the measuring nut (21) has a threaded hole that is threaded to engage with the adjusting screw (31).

10. The method for measuring the step difference in air rudder assembly as described in claim 9, characterized in that: The measuring nut (21) has four screw holes spaced apart along the circumference, and the adjusting screw (31) has four screw holes. The test length h2 is selected as the maximum value of the distance between the end face of the four adjusting screws (31) and the end face of the inner cone sleeve (5).

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