Aero-engine main bearing axial displacement measuring device and method

Abstract

The invention provides an aero-engine main bearing axial displacement measuring device and method, and belongs to the technical field of aero-engines, the aero-engine main bearing axial displacement measuring device comprises a bottom plate, a supporting seat, a dial indicator measuring tool, a bearing initial displacement measuring assembly and an axial loading displacement measuring assembly, the supporting seat comprises a first part and a second part, the first part is vertically connected with the bottom plate, and the second part is vertically connected with the dial indicator measuring tool; the main bearing is sleeved on the second part, the periphery of the second part is provided with a guide surface matched with the inner ring of the main bearing, the joint of the first part and the second part is provided with a step surface, the step surface forms a limiting end surface of the inner ring end surface of the main bearing with a dismounting groove, and the dial indicator measuring head abuts against the outer ring of the main bearing; when the free-state displacement activity amount is measured, the bearing initial displacement measurement assembly is fixed on the main bearing and the supporting seat; when the axial loading displacement is measured, the axial loading displacement measuring assembly is fixed on the supporting seat, and axial force is applied to the outer ring of the main bearing. According to the invention, effectiveness and high precision of bearing displacement measurement are realized and improved.

Description

Technical Field

[0001] The present application relates to the technical field of aero-engines, and in particular to a device and method for measuring the axial displacement of an aero-engine main bearing. Background Art

[0002] The selection and pairing of bearings is crucial during the development of aircraft engines, especially when designing the structures of compressor and fan test pieces. Due to the limitations of the unloading function of the compressor or fan tester, the rotor support must withstand large axial forces, even exceeding the maximum axial load of a single bearing, seriously affecting the life of the bearing and the safe operation of the test piece. Therefore, when designing the main support structure of the test piece, two bearings of the same model are installed "in series" side by side to jointly withstand the axial force on the rotor. To ensure that the axial displacement of the two bearings is consistent when loaded, it is necessary to select and pair the same type of bearings manufactured in the same batch to obtain high-precision bearing axial displacement to ensure that the bearings meet the requirements of use and measurement accuracy. Therefore, the design of the bearing pairing selection and measurement device and the measurement method play a vital role in the effectiveness of bearing selection and measurement accuracy.

[0003] Currently, the design of support structures for high-thrust compressor stages and fan test pieces typically uses a face-to-face or back-to-back configuration, significantly impacting bearing life. Therefore, a "tandem" configuration is often used, where bearings are installed in the same structural orientation. This requires pairing and installing two bearings with minimal axial displacement and nearly identical displacement values ​​under load. During bearing pairing testing, the axial displacement of each bearing under load must be measured with a displacement accuracy of 0.001mm. However, due to limited test platform space, high-precision test tools will move or adjust when measuring different bearing positions, resulting in uncertainty in the measured relative axial displacement. For example, accurately measuring the relative displacement between two steps on a bearing requires determining the axial movement of the bearing under load, while also accounting for the initial bearing displacement. Achieving a displacement accuracy of 0.001mm is a critical challenge in bearing selection. Summary of the Invention

[0004] In view of this, an embodiment of the present application provides an axial displacement measurement device and method for an aircraft engine main bearing, which can realize the precise measurement of the axial displacement activity of the main bearing under the axial force loading condition of ≮10kN. The axial displacement measurement method completely includes the initial displacement of the outer ring of the main bearing, completely simulates the axial displacement of the main bearing when the engine is axially loaded, supports the design of the paired main bearing support structure on the compressor and fan test pieces, and ensures the safety of the test piece test.

[0005] In a first aspect, an embodiment of the present application provides an axial displacement measuring device for an aircraft engine main bearing, the device comprising a base plate, a support seat, a micrometer measuring tool, a bearing initial displacement measuring assembly and an axial loading displacement measuring assembly, the micrometer measuring tool comprising a micrometer and a micrometer bracket, the micrometer bracket being arranged on the base plate, the support seat comprising a first part and a second part connected to each other, the first part of the support seat being vertically connected to the base plate, the main bearing being sleeved on the second part, the outer periphery of the second part being arranged as a guide surface for mounting with an inner ring of the main bearing, a step surface being provided at the connection between the first part and the second part, the step surface constituting a limit end surface of an inner ring end surface of the main bearing with a disassembly groove, the probe of the micrometer abutting against the outer ring of the main bearing; when measuring the free state displacement activity of the outer ring of the main bearing, the bearing initial displacement measuring assembly is fixed to the main bearing and the support seat, and the top ends of the outer ring and the inner ring of the main bearing are fixed flush by the bearing initial displacement measuring assembly; when measuring the axial loading displacement of the main bearing, the axial loading displacement measuring assembly is fixed to the support seat, and an axial force is applied to the outer ring of the main bearing.

[0006] According to a specific implementation method of an embodiment of the present application, the bearing initial displacement measurement assembly includes a first cover plate, a baffle, a first connecting member and a second connecting member. The first cover plate is fixed to the upper surface of the bearing inner ring on the support seat through the first connecting member. The bearing inner ring end face at the far end of the main bearing disassembly groove and the flush main bearing outer ring end face are limited and supported by the first cover plate. The baffle is set to a square sheet or L-shaped guide structure. The baffle is pressed on the outer ring end face of the main bearing where the micrometer probe abuts. The baffle is loaded and fixedly connected to the first cover plate through the second connecting member. The contact area of ​​the outer ring end face of the main bearing is provided with an abutment area for the micrometer probe. In the spacing area where the baffle is arranged on the outer ring end face of the main bearing, the micrometer measuring points are evenly arranged circumferentially and abut the center circle of the outer ring circular end face.

[0007] According to a specific implementation method of an embodiment of the present application, the axial loading displacement measuring assembly includes a second cover plate, a positioning rod, a clamping plate and a nut, the clamping plate is arranged on the upper surface of the support seat, the end face of the inner ring of the bearing at the far end of the main bearing disassembly groove is limited by the clamping plate, the positioning rod includes a connected smooth rod and a threaded rod, a part of the threaded rod is inserted into the inner thread connection of the support seat, and the other part of the threaded rod extends out of the support seat and the clamping plate and is threadedly connected to the nut; the second cover plate is set to a convex structure without a bottom surface, the interior of the raised part of the convex structure is transitionally matched with the smooth rod, the upper surface of the raised part of the convex structure is the axial force loading surface, and the two side edges of the lower half of the convex structure are abutted against the end face of the outer ring of the main bearing.

[0008] According to a specific implementation of the embodiment of the present application, the first connecting member and / or the second connecting member are configured as bolts.

[0009] According to a specific implementation of the embodiment of the present application, a guide cylinder is provided on the baffle, and the guide cylinder plays a guiding and fixing role when fixing the baffle.

[0010] According to a specific implementation of the embodiment of the present application, the axial force loading surface is set to an inwardly concave arc surface, and the axial force loading surface and the loading mechanism tooling are loaded through a joint bearing.

[0011] According to a specific implementation method of an embodiment of the present application, the verticality between the base plate and the support seat is better than level 7, and the parallelism between the plane of the base plate and the bearing mounting positioning surface on the support seat is better than level 7.

[0012] In a second aspect, embodiments of the present application further provide a method for measuring the axial displacement of an aircraft engine main bearing, using the aircraft engine main bearing axial displacement measuring device as described in any embodiment of the first aspect above, the method comprising: Assemble the main bearing to the limited end face of the support seat, with the disassembly groove of the main bearing outer ring facing downwards. Evenly strike the dial indicator on the end face of the main bearing outer ring near the disassembly groove below, perpendicular to the end face of the main bearing outer ring. Reserve a range margin of at least 0.5mm or 1.5 times the maximum bearing displacement for the dial indicator. Fix the bearing initial displacement measurement assembly on the main bearing and the support seat, make the outer ring and inner ring of the main bearing flush and press them away from the disassembly groove, and set the dial indicator to zero. Remove the bearing initial displacement measurement assembly, keep the dial gauge bracket stationary, and record the dial gauge reading at this time to obtain the axial displacement value including the initial movement of the bearing and when loaded; Keep the dial indicator bracket stationary, install the axial load displacement measuring assembly, apply axial force to the outer ring of the bearing through the axial load displacement measuring assembly, record the dial indicator reading at this time, and obtain the initial bearing movement and the axial displacement value after the bearing is loaded.

[0013] According to a specific implementation of the embodiment of the present application, the bearing initial displacement measurement assembly is fixed to the main bearing and the support seat, so that the outer ring and the inner ring of the main bearing are flush and pressed away from the disassembly groove, and the dial indicator is set to zero at this time, including: The baffle presses the outer ring of the main bearing onto the first cover plate and applies a pressing force so that the outer ring and the inner ring of the main bearing are flush and pressed away from the disassembly groove; The fixed dial indicator has been placed on the end face of the main bearing outer ring, and the dial indicator bracket remains in place to ensure that the dial indicator is always in the same position and has the measurement function; Set the micrometer for uniform measurement to zero based on the tightening state of the main bearing outer ring.

[0014] According to a specific implementation of the embodiment of the present application, the step of installing the axial loading displacement measurement assembly and applying an axial force to the bearing outer ring through the axial loading displacement measurement assembly includes: Use the positioning rod and nut to press the splint onto the inner ring of the main bearing. The second cover plate is loaded onto the outer ring of the main bearing along the positioning rod. The second cover plate has no contact with the positioning rod. After the second cover plate and the loading mechanism tooling are adjusted to be consistent with the center line, an axial force of ≮1000kg is applied to the outer ring of the main bearing at the joint bearing of the second cover plate.

[0015] Beneficial effects: The aerospace engine main bearing axial displacement measurement device and method in the embodiments of the present application solves the problem of high-precision measurement of bearing displacement activity when batch main bearing displacement activity is paired. The main reason is that when the axial force applied by the engine to the bearing is simulated, the axial displacement of the main bearing includes the axial activity of the bearing in the free state, making it difficult to determine the impact of the initial activity of the bearing on the axial displacement during loading. Moreover, when assembled to a compressor or fan test piece, it is necessary to clearly determine the high-precision axial displacement of the bearing during loading to support the design of its rotor support structure. Compared with the existing technology, the present application has the following advantages: The method for measuring the axial displacement of an aero-engine main bearing of the present invention can always keep the high-precision micrometer stationary, regardless of whether the initial movement test of the bearing is carried out or the displacement measurement after the bearing is loaded, thereby achieving the effectiveness and high precision of the displacement measurement. The present invention can measure the initial movement and axial displacement after loading of the same bearing on the same reference platform of the base, support seat and micrometer fixing fixture. It can also measure the initial movement and axial displacement after loading of bearings from the same batch, ensuring the consistency of the measuring device when measuring the displacement of different bearings. The present invention plays an important role in improving the reliability and effectiveness of bearing selection and pairing on the main support of an aero-engine, and is also applicable to bearing axial displacement measurement and high-precision bearing pairing measurement in various fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 Schematic diagram of a device for measuring the displacement of a main bearing outer ring in a free state according to an embodiment of the present invention; Figure 2Schematic diagram of a device for measuring the axial load displacement of a main bearing according to an embodiment of the present invention; Figure 3 FIG. 1 is a schematic diagram of the arrangement of bearing measurement points according to an embodiment of the present invention.

[0018] In the figure: 1-base plate, 2-M8 bolt, 3-support seat, 4-baffle, 5-M12 bolt, 6-first cover plate, 7-M20 bolt, 8-main bearing, 9-M12 nut, 10-micrometer measuring fixture, 11-M20 nut, 12-second cover plate, 13-positioning rod, 14-clamping plate, 15-measuring point position layout. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0020] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0021] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0022] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0023] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples. However, one skilled in the art will appreciate that the aspects described can be practiced without these specific details.

[0024] In the first aspect, the embodiment of the present application provides an aero-engine main bearing axial displacement measuring device, referring to Figure 1 and Figure 2 The device includes a base plate 1, a support seat 3, a dial indicator measuring tool 10, a bearing initial displacement measuring component and an axial load displacement measuring component. The dial indicator measuring tool 10 includes a dial indicator and a dial indicator bracket. The dial indicator bracket is arranged on the base plate 1. The support seat 3 includes a first part and a second part connected to each other. The first part of the support seat 3 is vertically connected to the base plate 1. The main bearing 8 is sleeved on the second part. The outer periphery of the second part is set as a guide surface for mounting with the inner ring of the main bearing 8. The connection between the first part and the second part is set There is a step surface, which constitutes the limit end surface of the inner ring end surface of the main bearing 8 with a disassembly groove, and the probe of the micrometer is in contact with the outer ring of the main bearing 8; when measuring the free state displacement activity of the outer ring of the main bearing 8, the bearing initial displacement measuring component is fixed to the main bearing 8 and the support seat 3, and the top ends of the outer ring and inner ring of the main bearing 8 are fixed flush through the bearing initial displacement measuring component; when measuring the axial loading displacement of the main bearing 8, the axial loading displacement measuring component is fixed to the support seat 3, and axial force is applied to the outer ring of the main bearing 8.

[0025] Furthermore, the bearing initial displacement measurement assembly includes a first cover plate 6, a baffle 4, a first connecting member and a second connecting member. The first cover plate 6 is fixed to the upper surface of the bearing inner ring on the support seat 3 through the first connecting member. The bearing inner ring end face at the far end of the main bearing 8 disassembly groove and the flush main bearing 8 outer ring end face are limited and supported by the first cover plate 6. The baffle 4 is set to a square sheet or L-shaped guide structure. The baffle 4 is pressed on the outer ring end face of the main bearing 8 against which the micrometer probe abuts. The baffle 4 is loaded and fixedly connected to the first cover plate 6 through the second connecting member. The contact area of ​​the outer ring end face of the main bearing 8 is provided with an abutment area for the micrometer probe. In the interval area where the baffle is arranged on the outer ring end face of the main bearing 8, the micrometer measuring points are evenly arranged circumferentially and abut the center circle of the outer ring circular end face.

[0026] In one embodiment, the first connecting member and / or the second connecting member are configured as bolts.

[0027] In one embodiment, a guide cylinder is provided on the baffle 4 , and the guide cylinder plays a guiding and fixing role when fixing the baffle 4 .

[0028] In specific implementation, when the bearing initial displacement measurement component is used, the free state displacement activity of the outer ring of the main bearing 8 can be obtained as a reference for measuring its axial load displacement. The base plate 1 and the support seat 3 are matched through the polished end faces and connected by positioning screws. The upper surface of the base plate 1 is installed with a magnetic seat; the verticality of the base plate 1 and the support seat 3 is better than level 7, and the parallelism of the plane of the base plate 1 and the main bearing 8 installation positioning surface on the support seat 3 is better than level 7; the micrometer measuring fixture 10 is installed and fixed on the end face of the base plate 1 to ensure that the micrometer measuring fixture 10 does not move slightly; the support seat 3 is provided with a limiting end face and an inner ring guide face for the installation of the main bearing 8; the guide surface of the support seat 3 and the installation fit of the inner ring of the main bearing 8 are transition fits, and the support seat 3 is provided with an M20 threaded hole along the center line of the main bearing 8; the threaded hole in the center of the end face of the support seat 3 is fixed to the first cover plate 6 and the main bearing 8 by tightening the M20 bolt 7. The inner ring is loaded and limited, and the M20 bolt 7 presses the first cover plate 6 to the load on the inner ring of the main bearing 8, the size of which refers to the corresponding compressor and fan test piece assembly requirements; a center hole is opened at the center of the first cover plate 6 to allow the M20 bolt 7 to pass through; the first cover plate 6 is connected to the baffle 4 by M12 bolts 5, and the first cover plate 6 is close to the outer ring of the main bearing 8, and there are 4 smooth holes evenly distributed around the circumference, the size of which is slightly larger than the size of the M12 bolts 5 passing through; the baffle 4 is pressed against the outer ring surface of the main bearing 8 close to the slot, so that the inner ring and outer ring at the other end of the main bearing 8 are pressed against the end face of the first cover plate 6, thereby ensuring that the inner ring and outer ring of the main bearing 8 away from the end face of the slot are coplanar; the baffle 4 and the M12 bolt 5 are fixed by M12 nuts 9.

[0029] Furthermore, the axial loading displacement measuring assembly includes a second cover plate 12, a positioning rod 13, a clamping plate 14 and a nut. The clamping plate 14 is arranged on the upper surface of the support seat 3. The end face of the inner ring of the bearing at the far end of the disassembly groove of the main bearing 8 is limited by the clamping plate 14. The positioning rod 13 includes a connected smooth rod and a threaded rod. A part of the threaded rod is inserted into the internal thread connection of the support seat 3, and the other part of the threaded rod extends out of the support seat 3 and the clamping plate 14 and is threadedly connected to the nut; the second cover plate 12 is set to a convex structure without a bottom surface, the interior of the raised part of the convex structure is transitionally matched with the smooth rod, the upper surface of the raised part of the convex structure is the axial force loading surface, and the two side edges of the lower half of the convex structure are in contact with the outer ring end face of the main bearing 8.

[0030] Furthermore, the axial force loading surface is set as an inwardly concave arc surface, and the axial force loading surface and the loading mechanism tooling are loaded through a joint bearing.

[0031] In practice, when using the axial load displacement measurement assembly, based on the initial bearing displacement, the axial displacement of the main bearing 8 from the free to loaded state is measured by applying an axial force of ≮10kN. The assembly includes a base plate 1, M8 bolts 2, a support seat 3, a bearing, a dial indicator measuring fixture 10, an M20 nut 11, a second cover plate 12, a positioning rod 13, and a clamping plate 14. Specifically, the M8 bolts 2 are M8 countersunk bolts, and the positioning rod 13 is an M20 positioning rod 13.

[0032] Specifically, the base plate 1 and the support seat 3 are matched through the polished end faces and connected by positioning screws; the verticality of the base plate 1 and the support seat 3 is better than level 7, and the parallelism of the plane of the base plate 1 and the main bearing 8 installation positioning surface on the support seat 3 is better than level 7; the end face of the base plate 1 is installed and fixed with a micrometer measuring tool 10 to ensure that the micrometer measuring tool 10 does not move slightly; the support seat 3 is provided with a limiting end face and an inner ring guide face for the installation of the main bearing 8, and the support seat 3 supports the inner ring end face of the main bearing 8 close to the disassembly groove; the installation cooperation of the guide surface of the support seat 3 and the inner ring of the main bearing 8 is a transition cooperation, and the support seat 3 is provided with an M20 threaded hole along the center line of the main bearing 8, and the M20 threaded hole in the center of the end face of the support seat 3 is tightened with a positioning rod 13 through an M20 nut 11, fixing the splint 14 and loading the inner ring of the main bearing 8, and the fixing The positioning rod 13 presses the load on the inner ring of the main bearing 8, and its size refers to the test piece assembly requirements; a center hole is opened at the center of the clamping plate 14 to allow the positioning rod 13 to pass through; the axial displacement of the outer ring end face of the main bearing 8 is measured by a fixed micrometer, and micrometer measuring fixtures 10 are evenly distributed around the circumference of the outer ring end face of the bearing, and the direction of the micrometer measuring fixture 10 is the axial direction; the positioning rod 13 and the clamping plate 14 are passed through by clearance fit, and are connected to the support seat 3 by an M20 thread, and are transitionally fitted with the second cover plate 12 through the polished rod part on the positioning rod 13; the end faces of the second cover plate 12 and the positioning rod 13 do not contact when loading, and the second cover plate 12 and the main bearing 8 are loaded by contacting the end face of the second cover plate 12 with the end face of the outer ring of the main bearing 8, and the loading surface of the second cover plate 12 and the loading mechanism fixture are loaded through the joint bearing fit.

[0033] In one embodiment, the perpendicularity between the base plate 1 and the support seat 3 is better than level 7, and the parallelism between the plane of the base plate 1 and the bearing mounting positioning surface on the support seat 3 is better than level 7.

[0034] In a second aspect, embodiments of the present application further provide a method for measuring the axial displacement of an aircraft engine main bearing 8, using the apparatus for measuring the axial displacement of an aircraft engine main bearing 8 as described in any embodiment of the first aspect above. The method comprises: Assemble the main bearing 8 to the limited end face of the support seat 3, with the disassembly groove of the outer ring of the main bearing 8 facing downward. Strike the dial indicator evenly on the end face of the outer ring below the main bearing 8 near the disassembly groove, perpendicular to the end face of the outer ring of the main bearing 8. Reserve a range margin of at least 0.5 mm or 1.5 times the maximum bearing displacement for the dial indicator. Fix the bearing initial displacement measurement assembly on the main bearing 8 and the support seat 3, so that the outer ring and the inner ring of the main bearing 8 are flush and pressed away from the disassembly groove, and set the dial indicator to zero. Remove the bearing initial displacement measurement assembly, keep the dial gauge bracket stationary, record the dial gauge reading at this time, and obtain the free state displacement activity of the outer ring of the main bearing 8; Keep the dial indicator bracket stationary, install the axial loading displacement measuring assembly, apply axial force to the outer ring of the bearing through the axial loading displacement measuring assembly, record the dial indicator reading at this time, and obtain the axial displacement value including the initial movement of the bearing and during loading.

[0035] Furthermore, the bearing initial displacement measuring assembly is fixed to the main bearing 8 and the support seat 3, so that the outer ring and the inner ring of the main bearing 8 are flush and pressed away from the disassembly groove, and the dial indicator is set to zero, including: The baffle 4 presses the outer ring of the main bearing 8 onto the first cover plate 6 and applies a pressing force so that the outer ring and the inner ring of the main bearing 8 away from the disassembly groove are flush and pressed; The fixed dial indicator has been placed on the end face of the outer ring of the main bearing 8, and the position of the dial indicator bracket remains unchanged, ensuring that the dial indicator is always in the same position and has the measurement function; Set the micrometer for uniform measurement to zero based on the tightening state of the outer ring of the main bearing 8.

[0036] Furthermore, the installation of the axial loading displacement measurement component and applying an axial force to the bearing outer ring through the axial loading displacement measurement component includes: Use the positioning rod 13 and the nut to press the clamp 14 onto the inner ring of the main bearing 8, and the second cover plate 12 is loaded onto the outer ring of the main bearing 8 along the positioning rod 13. The second cover plate 12 has no contact with the positioning rod 13. After the second cover plate 12 and the loading mechanism tooling are adjusted to be consistent with the center line, an axial force of ≮1000 kg is applied to the joint bearing of the second cover plate 12 on the outer ring of the main bearing 8.

[0037] In one embodiment, the method for measuring the axial displacement of an aircraft engine main bearing 8 specifically includes the following steps: Place the bearing initial displacement measurement assembly, support seat 3, base plate 1, main bearing 8 and micrometer measuring fixture 10 on a loading platform with high flatness and at the center of the force loading. When assembling the main bearing 8, install the main bearing 8 to the limit end face of the support seat 3 so that the disassembly groove of the outer ring of the main bearing 8 faces downward; the micrometer is arranged according to the measuring point position 15 (refer to Figure 3 ) are evenly hit on the end face of the outer ring of the disassembly groove below the main bearing 8, and are perpendicular to the end face of the outer ring of the main bearing 8. The micrometer reserves a range margin of more than 0.5mm or 1.5 times the maximum bearing displacement; the baffle 4 presses the outer ring of the main bearing 8 to the first cover plate 6 of the main bearing 8, and applies a moderate pressing force; after that, the fixed micrometer has been hit on the end face of the outer ring of the main bearing 8, and the position of the micrometer bracket is always fixed, so as to always ensure that the micrometer is in the same position and has the measurement function; after the installation of the initial displacement measuring device of the main bearing 8 is completed and the micrometer measurement is ready, the micrometer for uniform measurement is set to zero based on the tightening state of the outer ring of the main bearing 8, and then the first cover plate 6, M20 bolts 7, The baffle 4, M12 bolt 5 and M12 nut 9 always keep the base, support seat 3, inner ring of the main bearing 8 and dial indicator bracket stationary; the dial indicator bracket is stationary, and the displacement A1 of the outer ring of the main bearing 8 is measured at four measuring points evenly distributed around the circumference, and the arithmetic mean of the four displacements A1 is calculated, recorded as A1 average, and recorded; the dial indicator bracket remains stationary, and the outer ring of the main bearing 8 is rotated 180° along the circumference, and the displacement A2 of the outer ring of the main bearing 8 is measured at four measuring points evenly distributed around the circumference, and the arithmetic mean of the four displacements A2 is calculated, recorded as A2 average, and recorded; A1 average and A2 average are the arithmetic mean values ​​of the four points measured at the working position, and the difference between them should not exceed 0.001.

[0038] The micrometer bracket remains stationary, and when the outer ring of the main bearing 8 is rotated 180° along the circumference, after the axial movement of the main bearing 8 in the free state is determined, the clamping plate 14 is pressed onto the inner ring of the main bearing 8 using the positioning rod 13 and the M20 nut 11; the second cover plate 12 is loaded on the outer ring of the main bearing 8 along the positioning rod 13, and the second cover plate 12 cannot contact the positioning rod 13; after the second cover plate 12 and the material testing machine or loading device are adjusted to be consistent with the center line, a load of ≮1000kg is applied to the circumference of the outer ring of the main bearing 8 at the joint of the second cover plate 12 main bearing 8; the measured values ​​of the micrometer at this time are the initial movement of the main bearing 8 and the axial displacement value of the main bearing 8 after loading, the micrometer bracket does not move, and the main shaft is measured at 4 measuring points evenly distributed around the circumference. The displacement B1 of the outer ring of the main bearing 8 is measured, and the arithmetic mean of the four displacements B1 is calculated, recorded as B1 average, and recorded; after the load on the second cover plate 12 and the main bearing 8 is unloaded, the outer ring of the main bearing 8 is rotated 180° along the circumference, and then a load of ≮1000kg is applied to the second cover plate 12; the micrometer bracket remains stationary, and the displacement B2 of the outer ring of the main bearing 8 is measured at four measuring points evenly distributed on the circumference, and the arithmetic mean of the four displacements B2 is calculated, recorded as B2 average, and recorded; B1 average and B2 average are the arithmetic mean values ​​of the four measuring points measured under the loading state in the working position, and the difference between them should not exceed 0.008; the axial displacement activity of the main bearing 8 on the simulated test piece when loaded is recorded as B, and B is the average of B1 average and B2 average, and recorded.

[0039] After the load on the second cover plate 12 and the main bearing 8 is removed, the micrometer bracket, base and support seat 3 remain stationary, the splint 14, positioning rod 13, M20 nut 11 and upper cover plate are removed, and the axial displacement measurement of other main bearings 8 of the same batch in the free state and loaded state is restarted.

[0040] The main bearing 8, the axial displacement activity of the main bearings 8 of the same batch is arranged in order from large to small, and the difference between the activity of the main bearings 8 is obtained, and the difference is recommended not to exceed 0.001.

[0041] The embodiments provided by the present invention achieve accurate measurement of bearing displacement during actual installation and axial force loading of an aircraft engine main bearing 8. The measurement device and test method simulate the displacement produced by the bearing under actual loading and include the influence of the bearing's initial displacement, ensuring the reliability and effectiveness of bearing selection and pairing. Specifically, the present invention has the following effects: The method for measuring the axial displacement of an aircraft engine main bearing 8 of the present invention can always keep the high-precision micrometer stationary, regardless of whether the bearing initial movement test or the bearing displacement measurement after loading is carried out, thereby achieving the effectiveness and high precision of the displacement measurement. The present invention can realize the measurement of the initial movement amount and the axial displacement amount after loading of the same bearing on the same reference platform of the base, the support seat 3 and the micrometer fixing fixture, and can also carry out the measurement of the initial movement amount and the axial displacement amount after loading of the same batch of bearings, thereby ensuring the consistency of the measuring device when measuring the displacement of different bearings; The present invention overcomes the influence of the uncertainty of the outer ring movement of the main bearing 8. By simulating the actual installation state of the engine, the outer ring end face away from the main bearing 8 slot and the bearing inner ring are aligned with the end face of the same cover plate. Then, the baffle 4 that presses the outer ring end face of the bearing slot is removed. In this way, the initial axial displacement movement of the main bearing 8 is obtained and determined, providing a benchmark for accurately obtaining the axial displacement of the bearing under loaded conditions. The present invention plays an important role in improving the reliability and effectiveness of bearing selection and pairing on the main support of an aero-engine, and is also applicable to bearing axial displacement measurement and high-precision bearing pairing measurement in various fields.

[0042] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An aero-engine main bearing axial displacement measuring device, characterized in that: The device comprises a base plate (1), a support seat (3), a micrometer measuring tool (10), a bearing initial displacement measuring assembly and an axial load displacement measuring assembly, the micrometer measuring tool (10) comprises a micrometer and a micrometer bracket, the micrometer bracket is arranged on the base plate (1), the support seat (3) comprises a first part and a second part connected to each other, the first part of the support seat (3) is vertically connected to the base plate (1), the main bearing (8) is sleeved on the second part, the outer periphery of the second part is arranged as a guide surface for mounting with the inner ring of the main bearing (8), and the connection between the first part and the second part is A step surface is provided, which constitutes a limit end surface of the inner ring end surface of the main bearing (8) with a disassembly groove, and the probe of the micrometer abuts against the outer ring of the main bearing (8); when measuring the free state displacement activity of the outer ring of the main bearing (8), the bearing initial displacement measuring component is fixed to the main bearing (8) and the support seat (3), and the top ends of the outer ring and the inner ring of the main bearing (8) are fixed flush with each other through the bearing initial displacement measuring component; when measuring the axial loading displacement of the main bearing (8), the axial loading displacement measuring component is fixed to the support seat (3), and an axial force is applied to the outer ring of the main bearing (8).

2. The aircraft engine main bearing axial displacement measuring device according to claim 1, characterized in that: The bearing initial displacement measurement assembly comprises a first cover plate (6), a baffle plate (4), a first connecting member and a second connecting member, wherein the first cover plate (6) is fixed to the upper surface of the bearing inner ring on the support seat (3) through the first connecting member, the bearing inner ring end face at the far end of the main bearing (8) disassembly groove and the flush main bearing (8) outer ring end face are limited and supported by the first cover plate (6), the baffle plate (4) is set as a square sheet or an L-shaped guide structure, the baffle plate (4) is pressed on the main bearing (8) outer ring end face abutted by the micrometer probe, the baffle plate (4) is loaded and fixedly connected to the first cover plate (6) through the second connecting member, the main bearing (8) outer ring end face contact area is provided with an abutment area for the micrometer probe, and in the interval area where the baffle plate is arranged on the main bearing (8) outer ring end face, the micrometer measuring points are evenly arranged circumferentially and abut the center circle of the outer ring end face.

3. The device for measuring the axial displacement of an aircraft engine main bearing according to claim 1, characterized in that: The axial loading displacement measurement component includes a second cover plate (12), a positioning rod (13), a clamping plate (14) and a nut, wherein the clamping plate (14) is arranged on the upper surface of the support seat (3), and the end face of the inner ring of the main bearing (8) at the far end of the disassembly groove is limited by the clamping plate (14), and the positioning rod (13) includes a connected light rod and a threaded rod, a part of the threaded rod is inserted into the inner thread connection of the support seat (3), and the other part of the threaded rod extends out of the support seat (3) and the clamping plate (14) and is threadedly connected to the nut; the second cover plate (12) is set as a convex structure without a bottom surface, the inner part of the convex part of the convex structure is transitionally matched with the light rod, the upper surface of the convex part of the convex structure is an axial force loading surface, and the two sides of the lower half of the convex structure are in contact with the outer ring end face of the main bearing (8).

4. The device for measuring the axial displacement of an aircraft engine main bearing according to claim 2, wherein: The first connecting member and / or the second connecting member are configured as bolts.

5. The device for measuring the axial displacement of an aircraft engine main bearing according to claim 2, characterized in that: A guide cylinder is provided on the baffle (4), and the guide cylinder plays a guiding and fixing role when fixing the baffle (4).

6. The device for measuring the axial displacement of an aircraft engine main bearing according to claim 3, characterized in that: The axial force loading surface is set as an inwardly concave arc surface, and the axial force loading surface and the loading mechanism tooling are loaded through a joint bearing.

7. The aircraft engine main bearing axial displacement measuring device according to claim 1, characterized in that: The verticality of the base plate (1) and the support seat (3) is better than level 7, and the parallelism of the plane of the base plate (1) and the bearing mounting positioning surface on the support seat (3) is better than level 7.

8. A method for measuring the axial displacement of an aircraft engine main bearing, characterized in that: Using the aircraft engine main bearing axial displacement measuring device according to any one of claims 1 to 7, the method comprises: Assemble the main bearing (8) to the limit end face of the support seat (3), with the disassembly groove of the outer ring of the main bearing (8) facing downwards, and evenly hit the end face of the outer ring of the main bearing (8) near the disassembly groove below, and perpendicular to the end face of the outer ring of the main bearing (8). The dial indicator reserves a range margin of more than 0.5 mm or 1.5 times the maximum bearing displacement; Fix the bearing initial displacement measuring assembly on the main bearing (8) and the support seat (3), so that the outer ring and the inner ring of the main bearing (8) are flush and pressed away from the end of the disassembly groove, and set the micrometer at this time to zero; Remove the bearing initial displacement measurement assembly, keep the dial gauge bracket stationary, record the dial gauge reading at this time, and obtain the free state displacement activity of the outer ring of the main bearing (8); Keep the dial indicator bracket stationary, install the axial loading displacement measuring assembly, apply axial force to the outer ring of the bearing through the axial loading displacement measuring assembly, record the dial indicator reading at this time, and obtain the axial displacement value including the initial movement of the bearing and during loading.

9. The method for measuring the axial displacement of an aircraft engine main bearing according to claim 8, characterized in that: The bearing initial displacement measuring assembly is fixed on the main bearing (8) and the support seat (3), so that the outer ring and the inner ring of the main bearing (8) are flush and pressed away from the end of the disassembly groove, and the micrometer is set to zero at this time, including: The baffle (4) presses the outer ring of the main bearing (8) onto the first cover plate (6) and applies a pressing force so that the outer ring and the inner ring of the main bearing (8) are flush and pressed away from the end of the disassembly groove; The fixed dial indicator has been placed on the outer ring end face of the main bearing (8), and the dial indicator bracket remains in place to ensure that the dial indicator is always in the same position and has the measuring function; The micrometer for uniform measurement is set to zero with the outer ring of the main bearing (8) in a compressed state as the reference.

10. The method for measuring the axial displacement of an aircraft engine main bearing according to claim 8, characterized in that: The method of installing the axial loading displacement measurement component and applying an axial force to the bearing outer ring through the axial loading displacement measurement component includes: The clamping plate (14) is pressed onto the inner ring of the main bearing (8) using a positioning rod (13) and a nut. The second cover plate (12) is loaded onto the outer ring of the main bearing (8) along the positioning rod (13). The second cover plate (12) is not in contact with the positioning rod (13). After the second cover plate (12) and the loading mechanism tooling are adjusted to be consistent with the center line, an axial force of ≮1000 kg is applied to the joint bearing of the second cover plate (12) on the outer ring of the main bearing (8).

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