Stiffness measurement test device and measurement method for ball bearing outer ring

Abstract

The present application relates to ball bearing outer ring tester technical field, specifically to a kind of rigidity measurement test device and measurement method for ball bearing outer ring, including base platform, ball bearing outer ring is set on base platform, retaining cage is coaxially arranged in ball bearing outer ring, ball is installed on retaining cage, force transmission circular table is coaxially arranged with retaining cage, universal material testing machine pressure arm is correspondingly arranged above force transmission circular table;Displacement sensor is correspondingly installed around ball bearing outer ring by sensor clamping block.The method of the present application is to apply adjustable external load to ball bearing outer ring, and monitor the deformation of the circumferential position of the outer surface of the outer ring, obtain the deformation of the outer surface of the outer ring under certain external load, draw the force-displacement curve of the outer ring, and obtain the rigidity value of the bearing outer ring according to the slope of the curve, to measure the rigidity performance of the ball bearing outer ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ball bearing outer ring tester, in particular to a rigidity measurement test device and method for ball bearing outer ring. BACKGROUND

[0002] The basic structure of bearing includes bearing outer ring, bearing inner ring, rolling element and cage, which is mainly used for supporting and positioning the rotating body of machinery, reducing the friction coefficient in the movement process, and ensuring the rotation accuracy. Bearings are widely used in various fields, and modern high-performance mechanical equipment requires bearings to develop towards high speed, high load and low weight. Under the working conditions of high speed and high load, the bearing friction generates heat rapidly, and the bearing cooling demand becomes larger. In order to meet the above demand, various non-conventional cooling technologies for bearings have been developed. Among them, the bearing outer ring as a fixed element of the bearing is developing towards hollow and topological structure, and the cooling oil is passed into the hollow flow channel to realize the separate cooling of the bearing outer ring, so as to cope with the challenge of bearing cooling for modern high-performance mechanical equipment. Gao Wenjun discloses a ball bearing with cooling structure and a bearing cooling and lubricating method in the invention patent "Oil supply system of ball bearing with cooling structure" (application number 202210177733.7). The ball bearing includes a ball bearing inner ring, a cage and a ball bearing outer ring arranged in sequence from inside to outside. A plurality of annular cooling flow channels are arranged in the inner part of the ball bearing outer ring, and an upper connecting channel and a lower connecting channel are arranged on the ball bearing outer ring. Since this technology is in the exploratory stage, it is necessary to verify whether the structure of the bearing outer ring meets the rigidity requirement.

[0003] At present, the commonly used rigidity estimation methods include formula calculation, finite element simulation and test method. For the hollow bearing outer ring with internal cooling flow channel described in the invention patent 202210177733.7, there is no corresponding rigidity calculation formula due to the uniqueness of the flow channel shape. The material physical property parameters of the finished test piece are uncertain due to the use of metal 3D printing technology, and the results obtained by using the finite element simulation method often deviate from the actual situation. The test method can estimate the rigidity of the bearing outer ring.

[0004] The test device for rigidity measurement in the prior art in the field of support is mainly concentrated on the overall rigidity performance test of bearing and the rigidity test of elastic support, and lacks the rigidity measurement device for the single bearing outer ring. The present application designs a special rigidity measurement test device for ball bearing outer ring, and provides a rigidity measurement test method for bearing outer ring. SUMMARY

[0005] The purpose of the present application is to avoid the shortcomings of the prior art, and to provide a rigidity measurement test device and method for ball bearing outer ring for static analysis of bearing outer ring, i.e. rigidity analysis of bearing outer ring structure under stable load.

[0006] To achieve the above object, the technical scheme adopted by the present application is as follows: a rigidity measurement test device for a ball bearing outer ring, comprising a base platform, the ball bearing outer ring is horizontally placed on the base platform, the base platform is a regular hexagonal prism structure, and the base platform is horizontally placed on a compression disc of a universal material testing machine;

[0007] The ball bearing outer ring is coaxially provided with a force transmission circular table and a retainer, a plurality of balls are installed on the retainer between the ball bearing outer ring and the force transmission circular table, and the plurality of balls are uniformly distributed along the circumference of the retainer on the bearing outer ring raceway, and the plurality of balls are tangentially arranged with the raceway surface of the ball bearing outer ring and the force transmission circular table;

[0008] A compression arm of the universal material testing machine is correspondingly arranged above the force transmission circular table and closely contacts the upper surface of the force transmission circular table, so as to apply pressure to the force transmission circular table, and the force transmission circular table transmits the force load to the bearing outer ring through the plurality of balls;

[0009] Further, the rigidity measurement test device further comprises a displacement sensor for measuring the deformation of the outer surface of the outer ring, the displacement sensor is uniformly distributed as a plurality of displacement sensors through a sensor clamping block along the circumference of the ball bearing outer ring, and the plurality of displacement sensor probe ends are tangentially arranged in contact with the outer surface of the ball bearing outer ring.

[0010] Further, the angle between the line connecting the center points of the plurality of balls and the tangent points of the ball bearing outer ring and the radial center line of the bearing outer ring is a contact angle α, and the contact angle α is 15-30°.

[0011] Further, the sensor clamping block is fixed on the base platform through fastening screws, and the displacement sensor is fixed and constrained through the sensor clamping block and is in interference fit with the circular hole in the middle of the sensor clamping block.

[0012] Further, the sensor clamping block is composed of a cover plate, an upper clamping body, a lower clamping body and a bottom plate from top to bottom, the width of the cover plate, the upper clamping body, the lower clamping body and the bottom plate is 20-30 mm, the length of the cover plate, the upper clamping body and the lower clamping body is 35-40 mm, the length of the bottom plate is 60-70 mm, the thickness of the cover plate and the bottom plate is 3 mm, the height of the upper clamping body and the lower clamping body is the same, the total height of the sensor clamping block is 30-40 mm, and the cover plate, the upper clamping body, the lower clamping body and the bottom plate are connected through fastening screws.

[0013] The displacement sensor is in interference fit with the circular hole formed between the upper clamping body and the lower clamping body, and the ratio of the diameter of the circular hole to the diameter of the displacement sensor is 7:8.

[0014] Further, the base platform is a regular hexagonal prism structure, and the base platform is horizontally placed on the compression disc of the universal material testing machine.

[0015] The center of the lower bottom surface of the sensor clamping block is located on the diagonal line of the regular hexagon connecting the opposite vertices of the upper bottom surface of the base platform, and the distance between the center of the lower bottom surface of the sensor clamping block and the center of the regular hexagon of the upper bottom surface of the base platform is 130-140 mm.

[0016] Further, the six displacement sensors are evenly distributed along the outer surface of the bearing outer ring, and the ratio of the number of displacement sensors to the number of balls is 3:10.

[0017] Further, the ratio of the diameter d1 of the upper bottom surface of the force transmission circular table, the diameter d2 of the lower bottom surface of the force transmission circular table, the diameter d3 of the end surface of the pressure arm of the universal material testing machine, the diameter d4 of the ball, the inner diameter d5 of the retainer, the outer diameter d6 of the retainer, the inner diameter d7 of the outer ring of the ball bearing, the bottom diameter d8 of the outer ring of the ball bearing, the outer diameter d9 of the outer ring of the ball bearing, and the diagonal length d of the base platform hexagonal over-center are 16816:12996:10000:22225:16384:16984:17800:18900:20500:17321. 10

[0018] Further, the ratio of the height h1 of the force transmission circular table, the width h2 of the retainer, the height h3 of the base platform, and the width h4 of the outer ring of the ball bearing is 90:53:100:80.

[0019] The application also provides a method for measuring the stiffness of the outer ring of the ball bearing using the above-mentioned testing device, which comprises the following steps:

[0020] Step one: sequentially set the balls, the retainer and the force transmission circular table in the outer ring of the ball bearing, the force transmission circular table is coaxial with the outer ring of the ball bearing, and the outer ring of the ball bearing is placed horizontally on the base platform, and the base platform is fixed and constrained and does not displace;

[0021] Step two: the pressure arm of the universal material testing machine is pressed against the upper bottom surface of the force transmission circular table, the force load is transmitted to the outer ring of the ball bearing through the balls via the force transmission circular table, so as to realize the force load loading of the outer ring of the ball bearing to be measured;

[0022] Step three: the displacement sensors obtain the displacement conditions of the six measuring points on the outer surface of the outer ring of the bearing, and when the displacements of the measuring points are basically unchanged, it is considered that the deformation of the outer ring under the load condition is stable, and the deformation condition of the outer ring under the load condition is recorded;

[0023] Step four: change the size of the external load, repeat step three, and finally obtain the force-displacement curve of the outer ring, and obtain the stiffness value of the outer ring of the bearing according to the slope of the curve, so as to realize the stiffness measurement of the outer ring of the ball bearing to be measured.

[0024] ​Further, the universal material testing machine pressure arm in step two is used to apply adjustable pressure to the force transmission circular table at a rate of 0.5 mm / min, and the adjustable pressure range is 200N-20000N with reference to the load borne by the main shaft bearing of an aero-engine.

[0025] The displacement sensor in step three adopts a pen-type displacement sensor, the range is 2mm (±1mm), the resolution is 0.1μm, and the repeat accuracy is 0.3μm.

[0026] Compared with the prior art, the present application has the following technical effects: a rigidity measurement test device and method for a ball bearing outer ring, which uses a universal material testing machine pressure arm, transmits force load to the bearing outer ring through a force transmission circular table and a rolling body, can realize point load force loading for a single ball bearing outer ring, can more truly simulate the actual stress state of the ball bearing outer ring, and can obtain the deformation amount of the outer surface of the outer ring under different force load conditions through a displacement sensor; the bearing outer ring adopts a non-fixed multi-adaptive assembly mode, installation and disassembly are safe and convenient, the bearing outer ring can be replaced by a hollow bearing outer ring with the same inner and outer diameter size and a variable topology structure, in addition, variable contact angle force load loading can be realized by changing the geometric size of the ball and the force transmission circular table; the measurement method measures the force-displacement curve of the outer ring through the displacement sensor, and the bearing outer ring rigidity value can be obtained according to the curve slope; the outer load is directly applied by the universal material testing machine pressure arm, and dynamic control and detection of the force load can be conveniently implemented during operation. The present application has the advantages of simple structure, low part processing requirement, convenient installation and maintenance, and low cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a perspective structural schematic view of the test device of the present application;

[0028] Figure 2 It is a top view structural schematic view of the test device of the present application;

[0029] Figure 3 It is a sectional view structural schematic view of the test device of the present application;

[0030] Figure 4 It is a perspective structural schematic view of the test device of the present application; Figure 3 It is a partial enlarged structural schematic view of the test device of the present application;

[0031] Figure 5 It is a perspective structural schematic view of the sensor clamping block of the present application.

[0032] In the figure: 1, universal material testing machine pressure arm; 2, force transmission circular table; 3, ball bearing outer ring; 4, displacement sensor; 5, sensor clamping block; 501, cover plate; 502, upper clamping body; 503, lower clamping body; 504, bottom plate; 6, base platform; 7, fastening screw; 8, ball; 9, retainer. Detailed Implementation

[0033] The principles and features of the present invention are described below with reference to the accompanying drawings; the examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0034] To achieve the above objectives, the present invention provides the following specific embodiments:

[0035] Example 1: As Figures 1 to 5 As shown, a stiffness measurement test device for ball bearing outer rings includes a base platform 6, the ball bearing outer ring 3 is horizontally placed on the base platform 6, the base platform 6 is a regular hexagonal prism structure, and the base platform 6 is horizontally placed on the compression disc of a universal testing machine.

[0036] A force-transmitting frustum 2 and a cage 9 are coaxially arranged inside the outer ring 3 of the ball bearing. Multiple balls 8 are mounted on the cage 9 between the outer ring 3 and the force-transmitting frustum 2, and the multiple balls 8 are evenly distributed along the circumference of the cage 9 in the raceway of the outer ring of the bearing. The multiple balls 8 are tangent to the raceway surface of the outer ring 3 and the force-transmitting frustum 2. The angle between the line connecting the center point of the multiple balls 8 and the tangent point of the outer ring 3 of the ball bearing and the radial center line of the outer ring 3 of the bearing is the contact angle α, which is 15 to 30°.

[0037] The pressure arm 1 of the universal material testing machine is positioned above the force transmission frustum 2 and is in close contact with the upper surface of the force transmission frustum 2. It is used to apply pressure to the force transmission frustum 2. The force transmission frustum 2 transmits the force load to the bearing outer ring 3 through multiple balls 8.

[0038] It also includes displacement sensors 4 for measuring the deformation of the outer surface of the outer ring 3. Multiple displacement sensors 4 are evenly distributed along the circumference of the outer ring 3 via sensor clamping blocks 5. The probes of the multiple displacement sensors 4 are tangentially contacted with the outer surface of the outer ring 3. The sensor clamping blocks 5 are fixed to the base platform 6 by fastening screws 7. The displacement sensors 4 are fixed and constrained by the sensor clamping blocks 5 and are interference-fitted with the circular hole in the center of the sensor clamping blocks 5. Six displacement sensors 4 are evenly distributed along the circumference of the outer surface of the bearing outer ring, and the ratio of the number of displacement sensors 4 to the number of balls 8 is 3:10.

[0039] The sensor clamping block 5 is composed of a cover plate 501, an upper clamping body 502, a lower clamping body 503, and a base plate 504 from top to bottom. The width of the cover plate 501, the upper clamping body 502, the lower clamping body 503, and the base plate 504 is 20-30mm. The length of the cover plate 501, the upper clamping body 502, and the lower clamping body 503 is 35-40mm. The length of the base plate 504 is 60-70mm. The thickness of the cover plate 501 and the base plate 504 is 3mm. The upper clamping body 502 and the lower clamping body 503 have the same height. The total height of the sensor clamping block 5 is 30-40mm. The cover plate 501, the upper clamping body 502, the lower clamping body 503, and the base plate 504 are connected by fastening screws 7.

[0040] The displacement sensor 4 is interference-fitted with the circular hole formed between the upper clamp 502 and the lower clamp 503, and the ratio of the diameter of the circular hole to the diameter of the displacement sensor 4 is 7:8.

[0041] The center of the lower bottom surface of the sensor clamping block 5 is located on the diagonal of the opposite vertex of the regular hexagon on the upper bottom surface of the base platform 6, and the distance between the center of the lower bottom surface of the sensor clamping block 5 and the center of the regular hexagon on the upper bottom surface of the base platform 6 is 130-140mm.

[0042] The following parameters are specified: upper base diameter d1 of force transmission frustum 2; lower base diameter d2 of force transmission frustum 2; end face diameter d3 of pressure arm 1 of universal testing machine; diameter d4 of ball bearing 8; inner diameter d5 of cage 9; outer diameter d6 of cage 9; inner diameter d7 of ball bearing outer ring 3; groove bottom diameter d8 of ball bearing outer ring 3; outer diameter d9 of ball bearing outer ring 3; and length d of the diagonal passing through the center of the hexagonal base of base platform 6. 10 The ratio is 16816:12996:10000:22225:16384:16984:17800:18900:20500:17321.

[0043] The ratio of the height h1 of the force transmission frustum 2, the width h2 of the cage 9, the height h3 of the base platform 6, and the width h4 of the ball bearing outer ring 3 is 90:53:100:80.

[0044] Example 2: The same as example 1, the difference is that in this example; the angle between the line connecting the center point of the plurality of balls 8 and the tangent point of the bearing outer ring 3 and the radial center line of the bearing outer ring 3 is the contact angle α, and the contact angle α is 23°; in order to match the given bearing outer ring size in this example, the upper base diameter d1 of the force transmission circular table 2 is 168.16 mm; the lower base diameter d2 of the force transmission circular table 2 is 129.96 mm; the end face diameter d3 of the universal material testing machine pressure arm 1 is 100 mm; the diameter d4 of the ball 8 is 22.225 mm; the inner diameter d5 of the retainer 9 is 163.84 mm; the outer diameter d6 of the retainer 9 is 169.84 mm; the inner diameter d7 of the ball bearing outer ring 3 is 178 mm; the groove bottom diameter d8 of the ball bearing outer ring 3 is 189 mm; the outer diameter d9 of the ball bearing outer ring 3 is 205 mm; the diagonal line length d of the base platform 6 bottom surface hexagonal over center is 173.21 mm. 10

[0045] Example 3: The same as example 1, the difference is that in this example; considering that the specification of the universal material testing machine leads to limited effective test space, the height h1 of the force transmission circular table 2 is 45 mm; the width h2 of the retainer 9 is 26.5 mm; the height h3 of the base platform 6 is 50 mm; the width h4 of the ball bearing outer ring 3 is 40 mm.

[0046] Example 4: The present application also provides a method for measuring the stiffness of the ball bearing outer ring by the above-mentioned test device, which comprises the following steps:

[0047] Step one, the ball 8, the retainer 9 and the force transmission circular table 2 are sequentially sleeved in the ball bearing outer ring 3, the force transmission circular table 2 is coaxial with the ball bearing outer ring 3, the ball bearing outer ring 3 is placed horizontally on the base platform 6, and the base platform 6 is fixed and constrained and does not displace;

[0048] Step two, the universal material testing machine pressure arm 1 is pressed against the upper base of the force transmission circular table 2, the force load is transmitted to the ball bearing outer ring 3 through the force transmission circular table 2 via the ball 8, so as to realize the force load loading of the ball bearing outer ring 3 to be measured; wherein the universal material testing machine pressure arm 1 is used to apply adjustable pressure to the force transmission circular table 2 at a rate of 0.5 mm / min, and the adjustable pressure range is 200N-20000N with the load on the main shaft bearing of the aero-engine as the reference;

[0049] Step three, the displacement sensor 4 obtains the displacement of the six measuring points on the outer surface of the bearing outer ring, and when the displacement of each measuring point is basically unchanged, it is considered that the deformation of the outer ring under the load condition is stable, and the deformation of the outer ring under the load condition is recorded; wherein the displacement sensor 4 adopts a pen-type displacement sensor 4, the range is 2mm±1mm, the resolution is 0.1μm, and the repeatability is 0.3μm;

[0050] ​Step four, changing the external load size, repeating step three, finally obtaining the force-displacement curve of the outer ring, and obtaining the bearing outer ring stiffness value according to the curve slope, so as to realize the stiffness measurement of the measured ball bearing outer ring 3.

[0051] The above only describes the preferred embodiments of the present application; it is not intended to limit the present application; any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rig for stiffness measurement testing of a ball bearing outer race, characterised in that: It includes, base platform (6), ball bearing outer race (3) is placed horizontally on the base platform (6), the base platform (6) is a regular hexagonal structure, the base platform (6) is placed horizontally on the compression disc of the universal material testing machine; The ball bearing outer race (3) is coaxially provided with a force transmission circular table (2) and a retainer (9) inside, a plurality of balls (8) are installed on the retainer (9) between the ball bearing outer race (3) and the force transmission circular table (2), and the plurality of balls (8) are uniformly distributed along the circumference of the retainer (9) on the bearing outer race raceway, and the plurality of balls (8) are tangentially arranged with the raceway surface of the ball bearing outer race (3) and the force transmission circular table (2); The universal material testing machine pressure arm (1) is correspondingly arranged above the force transmission circular table (2), and is closely attached to the upper surface of the force transmission circular table (2), for applying pressure to the force transmission circular table (2), and the force transmission circular table (2) transmits the force load to the bearing outer race (3) through the plurality of balls (8); It also includes a displacement sensor (4) for measuring the deformation of the outer surface of the outer race (3), and the displacement sensor (4) is uniformly distributed as a plurality of sensors along the circumference of the ball bearing outer race (3) through the sensor clamping block (5), and the probe end of the plurality of displacement sensors (4) is tangentially arranged with the outer surface of the ball bearing outer race (3).

2. A rig for measuring the stiffness of a cup for a ball bearing as claimed in claim 1, characterised in that: The angle between the line connecting the center point of the plurality of balls (8) and the tangent point of the ball bearing outer race (3) and the radial center line of the bearing outer race (3) is the contact angle α, and the contact angle α is 15-30°.

3. A rigidity measuring test device for a cup of a ball bearing as set forth in claim 1, characterized in that: The sensor clamping block (5) is fixed on the base platform (6) by fastening screws (7), and the displacement sensor (4) is fixed and constrained by the sensor clamping block (5) and is in interference fit with the circular hole in the middle of the sensor clamping block (5).

4. A rigidity measuring test device for a cup of a ball bearing as set forth in claim 1, characterized in that: The sensor clamping block (5) is composed of a cover plate (501), an upper clamping body (502), a lower clamping body (503) and a bottom plate (504) from top to bottom, the width of the cover plate (501), the upper clamping body (502), the lower clamping body (503) and the bottom plate (504) is 20-30mm, the length of the cover plate (501), the upper clamping body (502) and the lower clamping body (503) is 35-40mm, the length of the bottom plate (504) is 60-70mm, the thickness of the cover plate (501) and the bottom plate (504) is 3mm, the height of the upper clamping body (502) and the lower clamping body (503) is the same, the total height of the sensor clamping block (5) is 30-40mm, and the cover plate (501), the upper clamping body (502), the lower clamping body (503) and the bottom plate (504) are connected by fastening screws (7); The displacement sensor (4) and the upper clamping body (502) and the lower clamping body (503) form an interference fit circular hole, and the ratio of the diameter of the circular hole to the diameter of the displacement sensor (4) is 7:

8.

5. A rigidity measuring test device for a cup of a ball bearing as set forth in claim 1, characterized in that: The center of the lower bottom surface of the sensor clamping block (5) is located on the diagonal line of the opposite vertex of the regular hexagonal connection of the upper bottom surface of the base platform (6), and the distance between the center of the lower bottom surface of the sensor clamping block (5) and the center of the regular hexagonal upper bottom surface of the base platform (6) is 130-140mm.

6. A rigidity measuring test device for a cup of a ball bearing as set forth in claim 1, characterized in that: The displacement sensor (4) is evenly distributed along the outer surface of the bearing outer ring, and the number of displacement sensors (4) is 3 times the number of balls (8).

7. A rigidity measuring test device for a cup of a ball bearing as set forth in claim 1, characterized in that: The upper bottom surface diameter d1 of the force transmission cone (2), the lower bottom surface diameter d2 of the force transmission cone (2), the end surface diameter d3 of the pressure arm (1) of the universal material testing machine, the diameter d4 of the ball (8), the inner diameter d5 of the retainer (9), the outer diameter d6 of the retainer (9), the inner diameter d7 of the outer ring (3) of the ball bearing, the groove bottom diameter d8 of the outer ring (3) of the ball bearing, the outer diameter d9 of the outer ring (3) of the ball bearing, the bottom surface hexagonal over-center diagonal length d of the base platform (6) 10 The ratio is 16816:12996:10000:2222.5:16384:16984:17800:18900:20500:17321.

8. A rigidity measuring test device for a cup of a ball bearing as claimed in any one of claims 1-7, characterized in that: The ratio of the height h1 of the force transmission circular table (2), the width h2 of the retainer (9), the height h3 of the base platform (6), and the width h4 of the ball bearing outer ring (3) is 90:53:100:

80.

9. A method of measuring the stiffness of a cup of a ball bearing using a test apparatus according to any one of claims 1 to 7, characterised in that: The method comprises the following steps: Step one, the balls (8), the retainer (9) and the force transmission circular table (2) are sequentially sleeved in the ball bearing outer ring (3), the force transmission circular table (2) is coaxial with the ball bearing outer ring (3), the ball bearing outer ring (3) is horizontally placed on the base platform (6), and the base platform (6) is fixed and constrained and does not displace; Step two, the universal material testing machine pressure arm (1) is pressed against the upper bottom surface of the force transmission circular table (2), the force load is transmitted to the ball bearing outer ring (3) through the balls (8) via the force transmission circular table (2), so as to realize the force load loading of the measured ball bearing outer ring (3); Step three, the displacement sensor (4) obtains the displacement of six measuring points on the outer surface of the bearing outer ring, and when the displacement of each measuring point is basically unchanged, it is considered that the deformation of the outer ring under the load condition is stable, and the deformation of the outer ring under the load condition is recorded; Step four, change the size of the external load, repeat step three, and finally obtain the force-displacement curve of the outer ring, and obtain the stiffness value of the bearing outer ring according to the slope of the curve, so as to realize the stiffness measurement of the measured ball bearing outer ring (3); 10. The method for measuring the stiffness of the ball bearing outer ring according to claim 9, wherein: In step two, the universal material testing machine pressure arm (1) is used to apply adjustable pressure to the force transmission circular table (2) at a rate of 0.5mm / min, and the load borne by the main shaft bearing of the aero-engine is taken as the reference, and the adjustable pressure range is 200N-20000N; In step three, the displacement sensor (4) is a pen-type displacement sensor (4) with a range of 1-3mm, a resolution of 0.1μm, and a repeatability of 0.3μm.

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