Rigidity measurement test device for ball bearing outer ferrule and measurement method

Abstract

The invention relates to the technical field of ball bearing outer ferrule testers. The rigidity measurement test device comprises a base platform, the ball bearing outer ferrule is arranged on the base platform, a retainer is coaxially arranged in the ball bearing outer ferrule, a ball is installed on the retainer, and a force transmission circular truncated cone is coaxially arranged with the retainer. The pressure arm of the universal material testing machine is correspondingly arranged above the force transfer circular table; the displacement sensor is correspondingly installed around the ball bearing outer ferrule through the sensor clamping block. According to the method, an adjustable external load is applied to the ball bearing outer ferrule, the deformation quantity of the circumferential position of the outer surface of the outer ferrule is monitored, the deformation quantity of the outer surface of the outer ferrule under the certain external load condition is obtained, an outer ferrule force-displacement curve is drawn, and the rigidity value of the bearing outer ferrule can be obtained according to the slope of the curve. The purpose of measuring the rigidity performance of the ball bearing outer ferrule is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ball bearing outer ring testers, and in particular to a stiffness measurement test device and method for a ball bearing outer ring. Background Art

[0002] The basic structure of a bearing consists of four parts: the outer ring, inner ring, rolling element, and cage. It is mainly used to support and position mechanical rotating bodies, reduce the friction coefficient during movement, and ensure its rotation accuracy. Bearings are widely used in various fields. Modern high-performance mechanical equipment requires bearings to develop in the direction of high speed, high load, and low weight. However, under high-speed and high-load working conditions, the friction heat generated by bearings increases dramatically, and the demand for bearing cooling increases. In order to meet the above needs, various unconventional bearing cooling technologies have been developed. Among them, the outer ring of the bearing, which is a fixed element of the bearing, is developing towards a hollow and topological structure. The outer ring of the bearing is cooled separately by introducing cooling oil into the hollow flow channel, thereby meeting the challenges of bearing cooling posed by modern high-performance mechanical equipment. Gao Wenjun disclosed a ball bearing with a cooling structure and a bearing cooling and lubrication method in the invention patent "An oil supply and return system for a ball bearing with a cooling structure" (application number 202210177733.7). The ball bearing includes a ball bearing inner ring, a retainer and a ball bearing outer ring arranged from the inside to the outside. The inner part of the ball bearing outer ring is provided with multiple annular cooling channels, and the ball bearing outer ring is provided with an upper connecting channel and a lower connecting channel. Since the technology is in the exploratory stage, it is necessary to verify whether the bearing outer ring structure meets the stiffness requirements.

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

[0004] In the prior art, the test devices for measuring stiffness in the support field focus on the overall stiffness performance test of the bearing and the elastic support stiffness test, etc., and lack the stiffness measurement device for the outer ring of a single bearing. The present invention designs a special ball bearing outer ring stiffness measurement test device and provides a bearing outer ring stiffness measurement test method. Summary of the invention

[0005] The purpose of the present invention is to avoid the shortcomings of the prior art and to provide a stiffness measurement test device and a measurement method for the outer ring of a ball bearing for static analysis of the outer ring of the bearing, that is, to perform stiffness analysis on the outer ring structure of the bearing under stable load conditions.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a stiffness measurement test device for the outer ring of a ball bearing, comprising a base platform, the outer ring of the ball bearing is horizontally placed on the base platform, the base platform is a regular hexagonal prism structure, and the base platform is horizontally placed on the compression plate of a universal material testing machine;

[0007] A force transmission cone and a cage are coaxially arranged in the outer ring of the ball bearing, a plurality of balls are mounted on the cage between the outer ring of the ball bearing and the force transmission cone, and the plurality of balls are evenly distributed on the raceway of the outer ring of the bearing along the circumference of the cage, and the plurality of balls are tangent to the raceway surface of the outer ring of the ball bearing and the force transmission cone;

[0008] The pressure arm of the universal material testing machine is correspondingly arranged above the force transmission round table and is closely fitted to the upper surface of the force transmission round table, and is used to apply pressure to the force transmission round table, and the force transmission round table transmits the force load to the outer ring of the bearing through multiple balls;

[0009] It also includes a displacement sensor for measuring the deformation of the outer surface of the outer ring. The displacement sensors are evenly distributed in multiple directions along the circumference of the outer ring of the ball bearing through a sensor clamping block. The probe ends of the multiple displacement sensors are arranged in tangential contact with the outer surface of the outer ring of the ball bearing.

[0010] Furthermore, the angle between the line connecting the tangent points of the center points of the multiple balls and the outer ring of the ball bearing and the radial center line of the outer ring of the bearing is the contact angle α, and the contact angle α is 15 to 30°.

[0011] Furthermore, the sensor clamping block is fixed to the base platform by fastening screws, and the displacement sensor is fixed and constrained by the sensor clamping block and is interference-fitted 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 are all 20-30 mm, the length of the cover plate, the upper clamping body and the lower clamping body are all 35-40 mm, the length of the bottom plate is 60-70 mm, the thickness of the cover plate and the bottom plate are both 3 mm, the height of the upper clamping body and the lower clamping body are 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 by fastening screws;

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

[0014] Furthermore, the base platform is a regular hexagonal prism structure, and the base platform is horizontally placed on the compression plate of the universal material testing machine;

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

[0016] Furthermore, six displacement sensors are evenly distributed along the circumferential direction of 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] Furthermore, the upper bottom diameter d1 of the force transmission truncated table, the lower bottom diameter d2 of the force transmission truncated table, the end face diameter d3 of the pressure arm of the universal material testing machine, the ball diameter d4, the inner diameter d5 of the cage, the outer diameter d6 of the cage, the inner diameter d7 of the outer ring of the ball bearing, the groove bottom diameter d8 of the outer ring of the ball bearing, the outer diameter d9 of the outer ring of the ball bearing, the diagonal length d of the bottom hexagon of the base platform through the center 10 The ratio is 16816:12996:10000:22225:16384:16984:17800:18900:20500:17321.

[0018] Furthermore, the ratio of the height h1 of the force transmission cone, the width h2 of the retaining frame, 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 present invention also provides a method for measuring the stiffness of the outer ring of a ball bearing using the above-mentioned test device, comprising the following steps:

[0020] Step 1: The ball, the cage and the force transmission cone are sequentially sleeved in the outer ring of the ball bearing. The force transmission cone and the outer ring of the ball bearing are coaxial. The outer ring of the ball bearing is horizontally placed on the base platform. The base platform is fixed and constrained without displacement.

[0021] Step 2: The pressure arm of the universal material testing machine is pressed against the upper bottom surface of the force transmission round table, and the force load is transmitted to the outer ring of the ball bearing through the force transmission round table via the ball, thereby realizing the force load loading of the outer ring of the ball bearing to be tested;

[0022] Step 3: The displacement sensor obtains the displacement of six measuring points on the outer surface of the bearing outer ring. When the displacement of each measuring point is basically unchanged, it is considered that the deformation of the outer ring is stable under the load condition, and the deformation of the outer ring under the load condition is recorded;

[0023] Step 4: Change the size of the external load and repeat step 3 to finally obtain the force-displacement curve of the outer ring. The stiffness value of the outer ring of the bearing is obtained according to the slope of the curve, thereby realizing the stiffness measurement of the outer ring of the ball bearing to be tested.

[0024] Furthermore, in the step 2, the pressure arm of the universal material testing machine is used to apply an adjustable pressure to the force transmission table at a rate of 0.5 mm / min. Taking the load on the main shaft bearing of the aircraft engine as a reference, the adjustable pressure range is 200N to 20000N.

[0025] The displacement sensor in step three is a pen-type displacement sensor with a measuring range of 2 mm (±1 mm), a resolution of 0.1 μm, and a repeatability of 0.3 μm.

[0026] Compared with the prior art, the present invention has the following technical effects: a stiffness measurement test device and method for ball bearing outer ring, which uses a universal material testing machine pressure arm to transmit force load to the bearing outer ring through a force transmission round table and a rolling body, can realize point load force loading for a single ball bearing outer ring, can more realistically simulate the actual stress state of the ball bearing outer ring; the displacement sensor can obtain the deformation amount of the outer surface of the outer ring under different force load conditions; the bearing outer ring adopts a non-fixed multi-adaptive assembly method, and the installation and disassembly are safe and convenient. The bearing outer ring can be replaced with a hollow bearing outer ring with the same inner and outer diameter size and variable topological structure. In addition, by changing the geometric dimensions of the ball and the force transmission round table, the force load loading with a variable contact angle can be realized; the measurement method measures the force-displacement curve of the outer ring through the displacement sensor, and the stiffness value of the bearing outer ring can be obtained according to the slope of the curve; by directly applying the external load through the universal material testing machine pressure arm, it is convenient to implement dynamic control and detection of the force load during operation. The present invention has a simple structure, low requirements for parts processing, convenient installation and maintenance, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the test device of the present invention;

[0028] Figure 2 It is a schematic diagram of the top view of the structure of the test device of the present invention;

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of the test device of the present invention;

[0030] Figure 4 The test device of the present invention Figure 3 Schematic diagram of partial enlarged structure;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the sensor clamping block of the present invention.

[0032] In the figure: 1. Pressure arm of universal material testing machine; 2. Force transmission round table; 3. Outer ring of ball bearing; 4. Displacement sensor; 5. Sensor clamping block; 501. Cover plate; 502. Upper clamp body; 503. Lower clamp body; 504. Bottom plate; 6. Base platform; 7. Fastening screws; 8. Ball; 9. Cage. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings; the examples given are only used to explain the present invention; they are not used to limit the scope of the present invention.

[0034] In order to achieve the above object, the present invention provides the following specific implementation methods:

[0035] Example 1: Figures 1 to 5 As shown, a stiffness measurement test device for a ball bearing outer ring includes a base platform 6, a 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 a compression plate of a universal material testing machine;

[0036] A force transmission cone 2 and a retaining frame 9 are coaxially arranged inside the outer ring 3 of the ball bearing, and multiple balls 8 are installed on the retaining frame 9 between the outer ring 3 of the ball bearing and the force transmission cone 2, and the multiple balls 8 are evenly distributed on the raceway of the outer ring of the bearing along the circumference of the retaining frame 9. The multiple balls 8 are arranged tangent to the raceway surface of the outer ring 3 of the ball bearing and the force transmission cone 2; the angle between the line connecting the center points of the multiple balls 8 and the tangent points of the outer ring 3 of the ball bearing and the radial center line of the outer ring 3 is the contact angle α, and the contact angle α is 15 to 30°.

[0037] The pressure arm 1 of the universal material testing machine is correspondingly arranged above the force transmission truncated table 2 and is closely fitted to the upper surface of the force transmission truncated table 2, and is used to apply pressure to the force transmission truncated table 2, and the force transmission truncated table 2 transmits the force load to the bearing outer ring 3 through a plurality of balls 8;

[0038] It also includes a displacement sensor 4 for measuring the deformation of the outer surface of the outer ring 3. The displacement sensors 4 are evenly distributed in multiple directions along the circumference of the outer ring 3 of the ball bearing through the sensor clamping block 5. The probe ends of the multiple displacement sensors 4 are tangentially contacted with the outer surface of the outer ring 3 of the ball bearing. The sensor clamping block 5 is fixed on the base platform 6 by the fastening screw 7. The displacement sensor 4 is fixed and constrained by the sensor clamping block 5 and is interference-fitted with the circular hole in the middle of the sensor clamping block 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 bottom plate 504 from top to bottom. The widths of the cover plate 501, the upper clamping body 502, the lower clamping body 503 and the bottom plate 504 are all 20-30 mm, the lengths of the cover plate 501, the upper clamping body 502 and the lower clamping body 503 are all 35-40 mm, the length of the bottom plate 504 is 60-70 mm, the thicknesses of the cover plate 501 and the bottom plate 504 are all 3 mm, the heights of the upper clamping body 502 and the lower clamping body 503 are the same, and the total height of the sensor clamping block 5 is 30-40 mm. 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;

[0040] The displacement sensor 4 is interference fit with the circular hole formed between the upper clamp body 502 and the lower clamp body 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 connecting the opposite vertices 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 130-140 mm.

[0042] The upper bottom diameter d1 of the force transmission truncated table 2, the lower bottom diameter d2 of the force transmission truncated table 2, the end face 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 ball bearing outer ring 3, the groove bottom diameter d8 of the ball bearing outer ring 3, the outer diameter d9 of the ball bearing outer ring 3, the diagonal length d of the bottom hexagon of the base platform 6 through the center 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 cone 2, the width h2 of the retaining frame 9, the height h3 of the base platform 6, and the width h4 of the outer ring 3 of the ball bearing is 90:53:100:80.

[0044] Embodiment 2: Same as Embodiment 1, except that in this embodiment; the angle between the line connecting the tangent points of the center points of the plurality of balls 8 and 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, and the contact angle α is 23°; to match the given outer ring size of the bearing in this embodiment, the upper bottom surface diameter d1 of the force transmission table 2 is 168.16 mm; the lower bottom surface diameter d2 of the force transmission table 2 is 129.96 mm; the end surface diameter d3 of the pressure arm 1 of the universal material testing machine is 100 mm; the diameter d4 of the ball 8 is 22.225 mm; the inner diameter d5 of the retaining frame 9 is 163.84 mm; the outer diameter d6 of the retaining frame 9 is 169.84 mm; the inner diameter d7 of the outer ring 3 of the ball bearing is 178 mm; the groove bottom diameter d8 of the outer ring 3 of the ball bearing is 189 mm; the outer diameter d9 of the outer ring 3 of the ball bearing is 205 mm; the diagonal length d through the center of the bottom surface hexagon of the base platform 6 10 It is 173.21mm.

[0045] Embodiment 3: Same as Embodiment 1, except that in this embodiment; considering that the effective test space is limited due to the specifications of the universal material testing machine, the height h1 of the force transmission table 2 is 45 mm; the width h2 of the retaining frame 9 is 26.5 mm; the height h3 of the base platform 6 is 50 mm; and the width h4 of the ball bearing outer ring 3 is 40 mm.

[0046] Embodiment 4: The present invention also provides a method for measuring the stiffness of the outer ring of a ball bearing using the above-mentioned test device, comprising the following steps:

[0047] Step 1: The ball 8, the cage 9 and the force transmission truncated cone 2 are sequentially sleeved in the outer ring 3 of the ball bearing. The force transmission truncated cone 2 is coaxial with the outer ring 3 of the ball bearing. The outer ring 3 of the ball bearing is horizontally placed on the base platform 6. The base platform 6 is fixed and constrained without displacement.

[0048] Step 2: The pressure arm 1 of the universal material testing machine is pressed against the upper bottom surface of the force transmission truncated table 2, and the force load is transmitted to the outer ring 3 of the ball bearing through the force transmission truncated table 2 via the ball 8, thereby realizing the force load loading of the outer ring 3 of the ball bearing to be tested; wherein, the pressure arm 1 of the universal material testing machine is used to apply an adjustable pressure to the force transmission truncated table 2 at a rate of 0.5 mm / min, and the adjustable pressure range is 200N to 20000N with reference to the load on the main shaft bearing of the aircraft engine;

[0049] Step 3: The displacement sensor 4 obtains the displacement of six measuring points on the outer surface of the bearing outer ring. When the displacement of each measuring point is basically unchanged, it is considered that the deformation of the outer ring is stable under the load condition, 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, with a measuring range of 2mm±1mm, a resolution of 0.1μm, and a repeatability of 0.3μm;

[0050] Step 4, changing the size of the external load, repeating step 3, and finally obtaining the force-displacement curve of the outer ring, and obtaining the stiffness value of the outer ring of the bearing according to the slope of the curve, thereby realizing the stiffness measurement of the outer ring 3 of the ball bearing to be tested.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A test device for measuring the stiffness of the outer ring of a ball bearing, characterized in that: The invention comprises a base platform (6), a 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 a compression plate of a universal material testing machine; A force transmission cone (2) and a retaining frame (9) are coaxially arranged inside the outer ring (3) of the ball bearing, a plurality of balls (8) are mounted on the retaining frame (9) between the outer ring (3) of the ball bearing and the force transmission cone (2), and the plurality of balls (8) are evenly distributed on the raceway of the outer ring of the bearing along the circumference of the retaining frame (9), and the plurality of balls (8) are arranged tangent to the raceway surface of the outer ring (3) of the ball bearing and the force transmission cone (2); The pressure arm (1) of the universal material testing machine is correspondingly arranged above the force transmission round table (2) and is closely fitted to the upper surface of the force transmission round table (2) and is used to apply pressure to the force transmission round table (2). The force transmission round table (2) transmits the force load to the outer ring (3) of the bearing through a plurality of balls (8); It also includes a displacement sensor (4) for measuring the deformation amount of the outer surface of the outer ring (3); the displacement sensors (4) are evenly distributed in a plurality along the circumference of the outer ring (3) of the ball bearing via a sensor clamping block (5); and the probe ends of the plurality of displacement sensors (4) are arranged in tangential contact with the outer surface of the outer ring (3) of the ball bearing.

2. The stiffness measurement test device for the outer ring of a ball bearing according to claim 1, characterized in that: The angle between the line connecting the center points of the plurality of balls (8) and the tangent points 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, and the contact angle α is 15 to 30°.

3. The stiffness measurement test device for the outer ring of a ball bearing according to claim 1, characterized in that: The sensor clamping block (5) is fixed on the base platform (6) by means of a fastening screw (7), and the displacement sensor (4) is fixed and constrained by the sensor clamping block (5) and is interference-fitted with the circular hole in the middle of the sensor clamping block (5).

4. The stiffness measurement test device for the outer ring of a ball bearing according to 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) are all 20 to 30 mm, the length of the cover plate (501), the upper clamping body (502) and the lower clamping body (503) are all 35 to 40 mm, the length of the bottom plate (504) is 60 to 70 mm, the thickness of the cover plate (501) and the bottom plate (504) are all 3 mm, the height of the upper clamping body (502) and the lower clamping body (503) are the same, and the total height of the sensor clamping block (5) is 30 to 40 mm. 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) is interference fit with the circular hole formed between the upper clamp body (502) and the lower clamp body (503), and the ratio of the diameter of the circular hole to the diameter of the displacement sensor (4) is 7:

8.

5. The stiffness measurement test device for the outer ring of a ball bearing according to claim 1, characterized in that: The center of the lower bottom surface of the sensor clamping block (5) is located on the diagonal connecting the opposite vertices 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 to 140 mm.

6. The stiffness measurement test device for the outer ring of a ball bearing according to claim 1, characterized in that: 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.

7. The stiffness measurement test device for the outer ring of a ball bearing according to claim 1, characterized in that: The upper bottom surface diameter d1 of the force transmission truncated table (2), the lower bottom surface diameter d2 of the force transmission truncated table (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 retaining frame (9), the outer diameter d6 of the retaining frame (9), the inner diameter d7 of the outer ring of the ball bearing (3), the groove bottom diameter d8 of the outer ring of the ball bearing (3), the outer diameter d9 of the outer ring of the ball bearing (3), the diagonal length d1 of the bottom surface hexagon of the base platform (6) through the center 10 The ratio is 16816:12996:10000:22225:16384:16984:17800:18900:20500:17321.

8. The stiffness measurement test device for the outer ring of a ball bearing according to any one of claims 1 to 7, characterized in that: The ratio of the height h1 of the force transmission truncated cone (2), the width h2 of the retaining frame (9), the height h3 of the base platform (6), and the width h4 of the outer ring of the ball bearing (3) is 90:53:100:

80.

9. A method for measuring the stiffness of the outer ring of a ball bearing using the test device as claimed in claims 1 to 8, characterized in that: The steps include: Step 1: The ball (8), the retaining frame (9) and the force transmission truncated cone (2) are sequentially sleeved in the outer ring (3) of the ball bearing, the force transmission truncated cone (2) and the outer ring (3) of the ball bearing are coaxial, and the outer ring (3) of the ball bearing is horizontally placed on the base platform (6), and the base platform (6) is fixed and constrained so as not to be displaced; Step 2: The pressure arm (1) of the universal material testing machine is pressed against the upper bottom surface of the force transmission truncated table (2), and the force load is transmitted to the outer ring (3) of the ball bearing through the force transmission truncated table (2) via the ball (8), thereby realizing the force load loading of the outer ring (3) of the ball bearing to be tested; Step 3: The displacement sensor (4) obtains the displacement of six measuring points on the outer surface of the bearing outer ring. When the displacement of each measuring point is basically unchanged, it is considered that the deformation of the outer ring is stable under the load condition, and the deformation of the outer ring under the load condition is recorded; Step 4, changing the external load size, repeating step 3, and finally obtaining the force-displacement curve of the outer ring, and obtaining the stiffness value of the bearing outer ring according to the slope of the curve, thereby realizing the stiffness measurement of the outer ring (3) of the ball bearing to be tested.

10. The method for measuring the rigidity of the outer ring of a ball bearing according to claim 9, characterized in that: In the step 2, the pressure arm (1) of the universal material testing machine is used to apply an adjustable pressure to the force transmission table (2) at a rate of 0.5 mm / min. Taking the load on the main shaft bearing of an aircraft engine as a reference, the adjustable pressure range is 200 N to 20,000 N. The displacement sensor (4) in step 3 is a pen-type displacement sensor (4) with a measuring range of 2 mm (±1 mm), a resolution of 0.1 μm, and a repeatability of 0.3 μm.

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