CN114964774B - Thrust bearing testing machine - Google Patents
Thrust bearing testing machine Download PDFInfo
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- CN114964774B CN114964774B CN202210543697.1A CN202210543697A CN114964774B CN 114964774 B CN114964774 B CN 114964774B CN 202210543697 A CN202210543697 A CN 202210543697A CN 114964774 B CN114964774 B CN 114964774B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention belongs to the technical field of test equipment, and particularly relates to a thrust bearing testing machine, which comprises a main body structure, a main body structure and a support frame, wherein the support frame consists of an upper table top, a lower table top and a stand column for connecting the upper table top and the lower table top; the device has the advantages of simple structure, convenient operation, accurate measurement data and strong repeatability of measurement results, and is convenient for carrying out quantitative analysis research on the tribology characteristics of high pair contact.
Description
The technical field is as follows:
the invention belongs to the technical field of test equipment, and particularly relates to a thrust bearing tester which can test the thickness and the friction torque of an elastohydrodynamic lubricating oil film so as to probe the lubricating state and the operating condition of a thrust bearing and represent the performance of a lubricant.
Background art:
the thrust bearing is composed of a shaft ring, a seat ring and a rolling body, is widely applied to a crane hook, a vertical water pump and various reducers of large equipment, can bear larger axial load, the tribological performance of the thrust bearing directly influences the running reliability of the equipment, and the thickness and the friction coefficient of a lubricating film are important indexes for defining the tribological performance of the thrust bearing.
The thrust bearing has the characteristics of a full bearing, and in the field of tribology, the thrust bearing is often used as a carrier to evaluate the performance of a rolling bearing, reveal the lubrication mechanism of the rolling bearing and evaluate the performance of different bearing materials and the performance of a lubricant. The thrust bearing testing machines in the prior art are various, for example, the testing machine used by the university of universality in the United states for researching the rolling contact life of materials and the stress of a retainer; a test machine used by the german aachen industry university to study the performance of ZDDP chemical films; the German Schaeffler technical center and the Mofu engineering research center are used for researching a testing machine of the white corrosion crack of the bearing; a tester used by the university of Germany Sall to study surface texture and abrasion behavior; a tester used by a grapevine mechanical engineering and engineering management research institute for researching the friction torque of a bearing and the performance of lubricating grease; in addition, the sliding thrust bearing accelerated wear online measurement testing machine disclosed in chinese patent 95208823.1 includes a rolling ball, an electric motor, a shaft, a rolling ball, a force-applying device, a cross beam, a test amplifying device, a lower pushing column, a base, a pillar, an upper pushing column, a tray, a housing, and a friction disc, where the force-applying device is installed on the base and connected with the rolling ball, the cross beam is connected with the base through the pillar, the lower pushing column passes through the cross beam, the lower end of the lower pushing column is seated on the rolling ball, the upper end of the lower pushing column is connected with the rolling ball, the upper end of the upper pushing column passes through the base, the lower end of the upper pushing column is seated on the rolling ball, the bottom end of the tray is seated on the rolling ball, the friction disc is connected with the shaft, the shaft passes through the bottom of the housing, the housing is connected with the base, and the electric motor is connected with the shaft and fixed on the housing; the device comprises a base, a motor, a coupler, a frame, rolling bearings and seats, a loading thrust bearing oil groove, a loading piston oil cylinder, a loading thrust bearing, a loading thrust disc, a seal, a test thrust bearing support system, a test thrust bearing bush, a thrust disc, a flywheel, a shaft, a cover plate, a guide bush and a seat, wherein the test bearing frame, the water tank base and the motor are fixed on the same plane; the combined loading thrust bearing test bed disclosed in chinese patent 201610069685.4 comprises a base, a support cavity fixed on the base, a support cavity cover connected to the top of the support cavity, and a pipeline inlet and outlet arranged around the support cavity; a test medium cavity connected to the base is arranged in the supporting cavity, and the top of the test medium cavity is connected with a test medium cavity cover; a test thrust bearing base is fixed in the test medium cavity, a test thrust bearing assembly is connected to the test thrust bearing base, a bearing bush at the upper part of the test thrust bearing assembly is matched with the lower end face of a thrust disc, the upper end of the thrust disc is circumferentially connected with the upper end of a shaft to transmit torque, and the shaft is composed of an upper bearing and a lower bearing fixed on the base to form a supporting structure and mainly bear radial force; the upper bearing is installed in the upper bearing seat in a matching way, and the upper bearing seat is connected to the test thrust bearing base; the thrust ball bearing seat is connected with the upper end face of the thrust disc, the loading disc is connected with the thrust ball bearing seat through a thrust ball bearing, the upper part of the loading disc is in high-pair contact with the end part of a piston rod of the hydraulic cylinder, and the bottom of the hydraulic cylinder is connected with the support cavity cover; the thrust disc is connected with the test medium cavity cover through the mechanical seal assembly, the thrust disc drives the movable ring of the mechanical seal assembly to rotate, and the test medium cavity cover is fixedly connected with the static ring of the mechanical seal assembly; the sealing medium inlet and the sealing medium outlet which are arranged on the mechanical sealing assembly are respectively connected with corresponding pipelines; the hydraulic cylinder and mechanical seal assembly are loaded in combination against a test thrust bearing assembly. However, the influence factors investigated by the above-described test equipment are relatively single, and a plurality of influence factors of the thrust bearing cannot be coupled. Therefore, a testing machine capable of simultaneously exploring a plurality of factors influencing the lubricating effect of the thrust bearing under different working conditions is researched and designed.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and develops and designs a thrust bearing testing machine, which is a device for measuring the thickness and the friction torque of lubricating oil film and provides data support for the research of tribology mechanisms.
In order to achieve the purpose, the main structure of the thrust bearing testing machine comprises a rack, an optical system, a rotary system, a loading system and a spindle system, wherein the rack is composed of an upper table top, a lower table top and a stand column for connecting the upper table top and the lower table top, the optical system and the rotary system are arranged on the upper table top, the loading system is arranged on the lower table top, the spindle system penetrates through the upper table top to be connected with the rotary system and the loading system, the spindle system is driven by a motor, and a limiting rod is further arranged on the upper table top.
The main structure of the optical system comprises a translation stage and a microscope connected with the translation stage; the translation platform sets up on the support, is connected with the connecting rod through the connecting plate, is provided with microscope support on the connecting rod, is provided with the microscope on the microscope support.
The main structure of the rotary system comprises a glass disc, a rotary shaft and a tension and compression sensor, wherein the rotary shaft is arranged in the center of the glass disc; a gasket is arranged between the glass disc and the rotating shaft, a sleeve is arranged at the upper end of the rotating shaft and fixed on the rotating shaft through a check ring, a support plate is arranged on the sleeve, two sensor supports which are symmetrical about the center are arranged on the support plate, and a tension-compression sensor is arranged on each sensor support.
The invention relates to a main structure of a loading system, which comprises a jack and a sensor arranged on the jack; the sensor is arranged at the top of the sensor chassis, the loading plate and the loading spring are arranged inside the sensor chassis, the sensor is arranged at the top of the sensor chassis, the top and the bottom of the sensor are respectively provided with an upper top cover and a lower bottom cover, and the loading spring is in contact with the lower bottom cover.
The main structure of the main shaft system comprises a main shaft and a ball support arranged on the main shaft; the top of the main shaft is connected with a ball support base through a bolt, the ball support base is sleeved with a ball support and a fixing ring, the lower portion of the main shaft is sleeved with an outer sleeve, two opposite-angle contact ball bearings which are installed face to face are arranged between the main shaft and the outer sleeve, a bearing support is arranged between the opposite-angle contact ball bearings, and the upper end and the lower end of the outer sleeve are respectively provided with an upper end cover and a lower end cover.
The optical system is used for collecting a light interference pattern, and the film thickness can be obtained by processing the interference pattern through a computer connected with the optical system, wherein the microscope comprises an ocular lens, an objective lens and a lens cone; the connecting rod, the microscope support and the microscope are connected into a whole, move horizontally on the displacement table, and the microscope support is provided with a focusing hand wheel which can adjust the longitudinal height of the microscope.
The rotary system related by the invention has the function of realizing the rotary motion of the glass disc; when the sensor rod is arranged on the rotating shaft, the rotating shaft rotates freely, and when the sensor rod is arranged on the rotating shaft, the rotation of the rotating shaft is collected by the sensor rod and the tension and compression sensor to measure the friction torque.
The loading system related to the embodiment loads a main shaft system, the main shaft system drives a ball support and a rolling body to press on a glass disc in the process of being pressed, wherein the rolling body is an AKS series steel ball, the diameter of the steel ball is 25.4mm, and the precision grade of the steel ball is G5; the specific loading process is as follows: the jack applies force to the loading plate, the loading plate flexibly applies the force to the sensor through the loading spring, and the sensor collects the force and outputs the force to the display panel matched with the sensor in real time.
The main shaft system related to the invention has the function of providing rotary motion to drive the ball support and the rolling body to rotate.
The invention relates to a thrust bearing testing machine which has two testing modes, wherein one mode is a film thickness measuring mode under the fixed state of a retainer, and the other mode is a friction torque measuring mode under the free state of the retainer; during the measurement, at first, evenly arrange the rolling element in the holder, then, arrange the holder in on the ball holds in the palm, secondly, evenly coat the emollient on glass dish and rolling element, then, through jack with main shaft system upper pressure, make the rolling element interfere with the glass dish, motor drive main shaft system rotates, and then drives ball holds in the palm and the rolling element rotates, at the rotation in-process: acquiring interference images between the rolling bodies and the glass disc in real time through an optical system, and acquiring friction force between the rolling bodies and the glass disc in real time through a tension and compression sensor; the specific process of film thickness measurement is as follows: the two sides of the retainer are provided with detachable stop levers, so that the motion of the retainer is limited by the limit levers, the motor drives the rolling bodies to rotate without revolution through the main shaft system, the rotation of the rolling bodies drives the glass discs to rotate, and the microscope collects interference images between the rolling bodies and the glass discs and transmits the interference images to the computer; the specific process of friction measurement is as follows: the sensor rod is arranged on the rotating shaft, the motion of the retainer is not limited, the motor drives the rolling body to rotate and revolve through the main shaft system, the rolling body drives the glass disc to rotate, the rotation trend of the glass disc is transmitted to the tension and compression sensor through the sensor rod, and the tension and compression sensor collects the rotation trend of the glass disc and transmits the rotation trend to the computer.
Compared with the prior art, the invention can collect the thickness of the lubricating oil film under the high-speed working condition in the state that the motion of the retainer is limited, measure the friction torque between the rolling body and the glass disc in the state that the motion of the retainer is not limited, abandon the conventional weight loading mode, realize the interference between the rolling body and the glass disc in a larger range by a jack pressing up a main shaft system, so as to obtain the film thickness and the friction torque under different operating parameters; the device has the advantages of simple structure, convenient operation, accurate measurement data and strong repeatability of measurement results, and is convenient for carrying out quantitative analysis research on the tribology characteristics of high pair contact.
Description of the drawings:
fig. 1 is a schematic view of the main structure of the present invention.
Fig. 2 is a schematic structural view of a gantry according to the present invention.
Fig. 3 is a schematic structural diagram of an optical system according to the present invention.
Fig. 4 is a schematic structural diagram of a swing system according to the present invention.
Fig. 5 is a schematic structural diagram of a loading system according to the present invention.
Fig. 6 is a schematic structural view of a spindle system according to the present invention.
Fig. 7 is a schematic sectional view of a spindle system according to the present invention.
Fig. 8 is a schematic view showing the assembly of the rolling elements and the cage according to the present invention.
FIG. 9 is a schematic view showing the mounting of the holder when the film thickness is measured according to the present invention.
Fig. 10 is a schematic view showing the installation of the cage in the friction force measurement of the present invention.
FIG. 11 is an optical interference plot of oil film thickness at different entrainment velocities in accordance with the present invention.
FIG. 12 shows a minimum film thickness h according to the present invention min And the thickness h of the center film cen The linear relationship with the entrainment velocity is shown schematically.
FIG. 13 is a graphical representation of the linear relationship of coefficient of friction to entrainment speed in accordance with the present invention.
The specific implementation mode is as follows:
the invention is further illustrated by the following examples in conjunction with the accompanying drawings.
Example 1:
the main structure of a thrust bearing testing machine related to the embodiment is shown in fig. 1, and comprises a rack 1 with a frame structure shown in fig. 2, wherein the rack 1 is composed of an upper table top 101, a lower table top 102 and a column 103 connecting the upper table top 101 and the lower table top 102, an optical system 2 and a rotation system 3 are arranged on the upper table top 101, a loading system 4 is arranged on the lower table top 102, a spindle system 5 driven by a motor 6 penetrates through the upper table top 101 to connect the rotation system 3 with the loading system 4, and in addition, a limiting rod 7 is also arranged on the upper table top 101; the main structure of the optical system 2 is shown in fig. 3, and includes a support 201, a translation stage 202, a connecting plate 203, a connecting rod 204, a microscope support 205 and a microscope 206; a translation table 202 is arranged on a support 201 of the table type structure, the translation table 202 is connected with a connecting rod 204 through a connecting plate 203, a microscope support 205 is arranged on the connecting rod 204, and a microscope 206 is arranged on the microscope support 205; the main structure of the rotating system 3 is shown in fig. 4, and includes a glass disc 301, a rotating shaft 302, a gasket 304, a sleeve 305, a retainer ring 306, a support plate 307, a sensor support 308 and a tension-compression sensor 309; a rotating shaft 302 is arranged in the center of a glass disc 301 with a circular structure, a gasket 304 is arranged between the glass disc 301 and the rotating shaft 302, a sleeve 305 is arranged at the upper end of the rotating shaft 302, the sleeve 305 is fixed on the rotating shaft 302 through a retaining ring 306, a support plate 307 is arranged on the sleeve 305, two sensor supports 308 which are symmetrical about the center are arranged on the support plate 307, and a tension and compression sensor 309 is arranged on the sensor supports 308; the main structure of the loading system 4 is shown in fig. 5, and includes a jack 401, a sensor chassis 402, a loading plate 403, a loading spring 404, a sensor 405, an upper top cover 406 and a lower bottom cover 407; a sensor chassis 402 is arranged at the upper end of the jack 401, a loading plate 403 and a loading spring 404 are arranged inside the sensor chassis 402, a sensor 405 is arranged at the top of the sensor chassis 403, an upper top cover 406 and a lower bottom cover 407 are respectively arranged at the top and the bottom of the sensor 405, and the loading spring 404 is in contact with the lower bottom cover 407; the main structure of the main shaft system 5 is shown in fig. 6, and includes a main shaft 501, a bolt 502, a ball retainer base 503, a ball retainer 504, a retainer ring 505, an outer sleeve 506, a diagonal contact ball bearing 507, a bearing support 508, an upper end cover 509, and a lower end cover 510; the top of the main shaft 501 is fixedly connected with a ball support base 503 through a bolt 502, a ball support 504 and a fixing ring 505 are sleeved on the ball support base 503, an outer sleeve 506 is sleeved on the lower portion of the main shaft 501, two opposite-angle contact ball bearings 507 which are installed face to face are arranged between the main shaft 501 and the outer sleeve 506, a bearing support 508 is arranged between the opposite-angle contact ball bearings 507, and an upper end cover 509 and a lower end cover 510 are respectively arranged at the upper end and the lower end of the outer sleeve 506.
The embodiment relates to a specific process for measuring the film thickness and the friction torque of a thrust bearing testing machine under the condition of full oil supply of FVA3 standard oil, which comprises the following steps:
(1) Mounting of
Respectively connecting a microscope 206 and a tension and compression sensor 309 with a computer, wiping the rolling bodies 100 and the retainer 200 clean by using petroleum ether and absolute ethyl alcohol, evenly arranging 3 rolling bodies 100 on the retainer 200, fixing by using an M3 bolt, placing the retainer 200 on a ball support 504, and evenly coating a lubricant on the rolling bodies 100 and the glass disc 301;
(2) Regulating
Pressing the spindle system 5 upwards through a jack 401 to enable the rolling body 100 to be in initial contact with the glass disc 301, adjusting the translation table 202 to enable the rotation center line of the rolling body 100 to be overlapped with the center line of the microscope 206, and then adjusting the focal length of the microscope 206 and the light intensity value of the external red-green light source to be set values to obtain a clear interference image;
(3) Loading
Rotating a jack 401, pressing a main shaft system 5 upwards to enable the rolling bodies 100 to interfere with the glass disc 301, stopping loading when the display value of a display panel matched with the sensor 405 is 90N, and enabling the load of each rolling body 100 to be 30N;
(4) Drive the
Setting the rotating speed of the motor 6 to be 10-1024mm/s, starting the motor 6, and driving the rolling body 100 and the glass disc 301 to rotate by the motor 6 through the spindle system 5;
(5) Film thickness measurement
Before film thickness measurement, stop levers 300 are arranged at two ends of the retainer 200 to limit the movement of the retainer 200, the rolling body 100 can only rotate, an interference image between the rolling body 100 and the glass disc 301 is collected through a microscope 206 and transmitted to a computer, and the interference image is processed based on film thickness processing software to obtain film thickness data;
(6) Friction torque measurement
Before friction torque measurement, a sensor rod 303 is arranged on a rotating shaft 302, the motion of the retainer 200 is not limited, a motor 6 drives a rolling body 100 to rotate and revolve through a spindle system 5, the rolling body 100 drives a glass disc 301 to rotate, the glass disc 301 drives the rotating shaft 302 to rotate, the sensor rod 303 is further driven to rotate, and a tension and compression sensor 309 acquires the rotation trend of the sensor rod 303 and transmits the rotation trend to a computer.
As shown in fig. 11, 12 and 13, it can be seen that the minimum film thickness and the central film thickness show nearly linear increasing trends in logarithmic coordinates as the entrainment speed increases, and the friction coefficient decreases and increases as the entrainment speed increases, so that the film thickness and the friction torque are measured.
The glass disc 301 according to this embodiment is made of K9 glass, has a surface roughness Ra of 20nm and a diameter of 150mm, and is coated with a light-analyzing Cr film, a poisson's ratio of 0.208, and an elastic modulus of 81Gpa; the rolling body 100 is made of GCr15 steel, the precision is G5, the surface roughness Ra is 14nm, the diameter is 25.4mm, the Poisson ratio is 0.3, and the elastic modulus is 210Gpa; the lubricant is mineral oil FVA3 with viscosity grade ISO VG 100.
Claims (6)
1. A thrust bearing testing machine is characterized in that a main body structure comprises a rack, an optical system, a rotary system, a loading system and a spindle system, wherein the rack is composed of an upper table top, a lower table top and a stand column for connecting the upper table top with the lower table top; the main structure of the rotary system comprises a glass disc, a rotary shaft arranged in the center of the glass disc, and a tension and compression sensor; a gasket is arranged between the glass disc and the rotating shaft, the upper end of the rotating shaft is provided with a sleeve, the sleeve is fixed on the rotating shaft through a check ring, a support plate is arranged on the sleeve, two sensor supports which are symmetrical about the center are arranged on the support plate, and a tension-compression sensor is arranged on each sensor support; the rotary system is used for realizing the rotary motion of the glass disc; when the sensor rod is arranged on the rotating shaft, the rotation of the rotating shaft is collected by the sensor rod and the tension and compression sensor to measure the friction torque, and when the sensor rod is not arranged on the rotating shaft, the rotating shaft freely rotates; the main structure of the loading system comprises a jack and a sensor arranged on the jack; the upper end of the jack is provided with a sensor chassis, a loading plate and a loading spring are arranged inside the sensor chassis, the sensor is arranged at the top of the sensor chassis, the top and the bottom of the sensor are respectively provided with an upper top cover and a lower bottom cover, and the loading spring is in contact with the lower bottom cover; the main structure of the main shaft system comprises a main shaft and a ball support arranged on the main shaft; the top of the main shaft is connected with a ball support base through a bolt, the ball support base is sleeved with a ball support and a fixing ring, the lower part of the main shaft is sleeved with an outer sleeve, two opposite angular contact ball bearings which are installed oppositely are arranged between the main shaft and the outer sleeve, a bearing support is arranged between the opposite angular contact ball bearings, and the upper end and the lower end of the outer sleeve are respectively provided with an upper end cover and a lower end cover; the main shaft system is used for providing rotary motion and driving the ball support and the rolling body to rotate.
2. The thrust bearing testing machine of claim 1, wherein the optical system is used for collecting an optical interference pattern, the film thickness can be obtained by processing the interference pattern through a computer connected with the optical system, and the main structure comprises a translation stage and a microscope connected with the translation stage; the translation table is arranged on the support and connected with the connecting rod through the connecting plate, a microscope support is arranged on the connecting rod, and a microscope is arranged on the microscope support and comprises an eyepiece, an objective lens and a lens cone; connecting rod, microscope support and microscope connect into whole, and horizontal migration is provided with the focusing hand wheel on the microscope support on the displacement platform, can adjust microscopical vertical height.
3. The thrust bearing testing machine of claim 1, wherein the loading system loads a main shaft system, the main shaft system drives a ball support and a rolling body to press on a glass disc in the process of being pressed, wherein the rolling body is an AKS series steel ball with a diameter of 25.4mm and a precision grade of G5; the specific loading process is as follows: the jack applies force to the loading plate, the loading plate flexibly applies the force to the sensor through the loading spring, and the sensor collects the force and outputs the force to the display panel matched with the sensor in real time.
4. The thrust bearing testing machine according to claim 3, wherein there are two test modes, one is a film thickness measurement mode in a fixed state of the holder, and the other is a friction torque measurement mode in a free state of the holder; during the measurement, at first, evenly arrange the rolling element in the holder, then, arrange the holder in on the ball holds in the palm, secondly, evenly coat the emollient on glass dish and rolling element, then, through jack with main shaft system upper pressure, make the rolling element interfere with the glass dish, motor drive main shaft system rotates, and then drives ball holds in the palm and the rolling element rotates, at the rotation in-process: interference images between the rolling bodies and the glass discs are acquired in real time through the optical system, and friction between the rolling bodies and the glass discs is acquired in real time through the tension and compression sensors.
5. The thrust bearing testing machine according to claim 4, wherein the specific process of film thickness measurement is as follows: the two sides of the retainer are provided with detachable stop levers, so that the motion of the retainer is limited by the limit levers, the motor drives the rolling bodies to rotate without revolution through the main shaft system, the rotation of the rolling bodies drives the glass discs to rotate, and the microscope collects interference images between the rolling bodies and the glass discs and transmits the interference images to the computer.
6. The thrust bearing testing machine according to claim 4, wherein the friction force measurement is carried out by the following specific process: the sensor rod is arranged on the rotating shaft, the motion of the retainer is not limited, the motor drives the rolling body to rotate and revolve through the main shaft system, the rolling body drives the glass disc to rotate, the rotation trend of the glass disc is transmitted to the tension and compression sensor through the sensor rod, and the tension and compression sensor collects the rotation trend of the glass disc and transmits the rotation trend to the computer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210543697.1A CN114964774B (en) | 2022-05-19 | 2022-05-19 | Thrust bearing testing machine |
| PCT/CN2022/107867 WO2023221291A1 (en) | 2022-05-19 | 2022-07-26 | Thrust bearing testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210543697.1A CN114964774B (en) | 2022-05-19 | 2022-05-19 | Thrust bearing testing machine |
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| Publication Number | Publication Date |
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| CN114964774A CN114964774A (en) | 2022-08-30 |
| CN114964774B true CN114964774B (en) | 2023-03-24 |
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| CN202210543697.1A Active CN114964774B (en) | 2022-05-19 | 2022-05-19 | Thrust bearing testing machine |
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| WO (1) | WO2023221291A1 (en) |
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| CN117092024B (en) * | 2023-10-20 | 2024-02-02 | 华侨大学 | Multifunctional friction lubrication test bed |
| CN117451359B (en) * | 2023-12-21 | 2024-02-27 | 青岛智和精密科技有限公司 | Moment motor bearing durability test equipment and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3895255B2 (en) * | 2002-10-08 | 2007-03-22 | Ｎｔｎ株式会社 | Fluid bearing inspection method and inspection apparatus |
| CN101709953B (en) * | 2009-12-03 | 2012-05-09 | 清华大学 | Lubricant film thickness measuring instrument |
| CN202109889U (en) * | 2011-06-14 | 2012-01-11 | 青岛理工大学 | Measuring instrument of thrust ball bearing lubricating oil film |
| CN102353335B (en) * | 2011-06-14 | 2013-08-21 | 青岛理工大学 | Optical-interference stepped-speed method for measuring oil-film thickness |
| US10281388B2 (en) * | 2015-12-18 | 2019-05-07 | Ducom Instruments Pvt. Ltd. | Tester to estimate co-efficient of friction and determine properties of a sample lubricant |
| CN107228629B (en) * | 2017-07-17 | 2023-06-30 | 青岛理工大学 | High pair contact sliding-rolling ratio oil film thickness and friction force simultaneous measurement simulation device |
| CN108254185A (en) * | 2017-12-28 | 2018-07-06 | 上海建桥学院 | Apply the rolling bearing performance experimental rig of radially alternating load based on crank connecting link |
| CN108507480B (en) * | 2018-04-08 | 2020-06-30 | 青岛理工大学 | Real-time measuring device for lubricating oil film and friction force of sliding block bearing |
| CN108534935B (en) * | 2018-04-08 | 2019-11-22 | 青岛理工大学 | - three contact of incline plane simple sliding operating condition fretting wear of one bulb and measuring lubricating oil film device |
| CN111780972A (en) * | 2020-08-13 | 2020-10-16 | 青岛理工大学 | Device for measuring friction force and film thickness of lubricating oil film under surface speed difference |
| CN111855207A (en) * | 2020-09-04 | 2020-10-30 | 中国人民解放军陆军装甲兵学院 | Self-lubricating joint bearing friction wear life testing machine |
| CN112985807A (en) * | 2021-04-22 | 2021-06-18 | 青岛理工大学 | Cambered surface roller ball holds in palm structure |
| CN113155460B (en) * | 2021-05-08 | 2023-06-30 | 河南科技大学 | Rolling friction force measuring system of bearing rolling body and loading device thereof |
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| CN114964774A (en) | 2022-08-30 |
| WO2023221291A1 (en) | 2023-11-23 |
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