CN115541083A - Bearing friction torque measuring instrument capable of applying axial load - Google Patents
Bearing friction torque measuring instrument capable of applying axial load Download PDFInfo
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- CN115541083A CN115541083A CN202211070671.6A CN202211070671A CN115541083A CN 115541083 A CN115541083 A CN 115541083A CN 202211070671 A CN202211070671 A CN 202211070671A CN 115541083 A CN115541083 A CN 115541083A
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- 238000012360 testing method Methods 0.000 claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 description 16
- 239000000725 suspension Substances 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000035772 mutation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0009—Force sensors associated with a bearing
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Abstract
The invention relates to the technical field of special measuring instruments for bearings, in particular to a bearing friction torque measuring instrument capable of applying axial load, which comprises a torque sensor and a measuring tool component, wherein the measuring tool component comprises a bearing outer ring supporting seat and a bearing inner ring pressing plate, the bearing inner ring pressing plate is used for mounting a test bearing and is in interference fit with an inner ring of the test bearing, the bearing outer ring supporting seat and the bearing inner ring pressing plate are coaxially arranged, and the inner wall of the bearing outer ring supporting seat is in interference fit with an outer ring of the test bearing; bearing inner race clamp plate one end is connected with torque sensor other end and is connected with radial loading mechanism, thereby radial loading mechanism separates bearing and the quality piece that awaits measuring with flexible connection between the test bearing, has avoided directly pressurizing the quality piece on the bearing the quality piece that this kind of condition caused and the whole great moment of inertia that possesses of rigidity that the bearing that awaits measuring formed and the problem of the moment of torsion sensor output lag and sudden change that brings.
Description
Technical Field
The invention relates to the technical field of special measuring instruments for bearings, in particular to a bearing friction torque measuring instrument capable of applying axial load.
Background
The precision bearing is an important component part of precision instruments and precision mechanical equipment, and the friction torque of the bearing is one of important technical indexes of the dynamic performance quality of the bearing, particularly the bearing used in high-end fields such as spaceflight, aviation, navigation and the like, the size and fluctuation value of the friction torque directly influence the service life, stability and reliability of the system, so that the bearing has extremely strict requirements on the friction torque of the bearing, the bearing friction torque is accurately measured, and the method is an important means for detecting the quality of the bearing in the processes of bearing development, production, assembly and use. Particularly, for a bearing an axial force in an actual working condition, a certain axial force needs to be applied to the bearing when measuring, an axial force loading mechanism of the current instrument suitable for measuring the friction torque of the bearing is complex, inconvenient to operate and low in precision, and the invention provides a bearing friction torque measuring instrument capable of applying an axial load to solve the technical problems.
Disclosure of Invention
In order to solve the defects mentioned in the background art, the invention aims to provide a bearing friction torque measuring instrument capable of applying axial load, and solves the problem that an axial force loading mechanism for measuring the friction torque of a bearing in the prior art is complex and inconvenient to operate.
The purpose of the invention can be realized by the following technical scheme:
a bearing friction torque measuring instrument capable of applying axial load comprises a torque sensor and a measuring tool component, wherein the measuring tool component comprises a bearing outer ring supporting seat and a bearing inner ring pressing plate, the bearing inner ring pressing plate is used for mounting a test bearing and is in interference fit with an inner ring of the test bearing, the bearing outer ring supporting seat and the bearing inner ring pressing plate are coaxially arranged, and the inner wall of the bearing outer ring supporting seat is in interference fit with an outer ring of the test bearing; one end of the bearing inner ring pressing plate is connected with a torque sensor, and the other end of the bearing inner ring pressing plate is connected with a radial loading mechanism which is flexibly connected with the test bearing.
Furthermore, the radial loading mechanism is a hydraulic loading system, and the radial loading mechanism is rotationally connected with the bearing inner ring pressing plate.
Furthermore, the radial loading mechanism is arranged below the bearing inner ring pressing plate and comprises a mass block and a hanging wire, and the mass block is connected with the bearing inner ring pressing plate through a flexible hanging wire.
Furthermore, a main shaft component is arranged below the bearing outer ring supporting seat and comprises a driving shaft, and the driving shaft is fixedly connected with the bearing outer ring supporting seat.
Further, a code wheel is mounted on the driving shaft.
Further, a torque sensor position adjusting component is arranged on the side face of the torque sensor, the torque sensor position adjusting component comprises a torque sensor mounting plate capable of moving in three axes of a three-dimensional coordinate system, and the torque sensor is mounted on the torque sensor mounting plate.
Further, the torque sensor mounting plate is driven by a screw rod to move up and down and move horizontally.
Further, the drive shaft assumes a hollow configuration.
Furthermore, a wire fixing cover is arranged below the driving shaft, and a through hole for the hanging wire to pass through is formed in the wire fixing cover.
A method for applying axial load to a bearing friction torque measuring instrument is characterized in that the axial load is connected with a bearing through a rotary connection or a flexible rope.
The invention has the beneficial effects that:
the loading of the axial load is carried out in a mass block and hanging wire suspension mode, so that the bearing to be tested is separated from the mass block, and the problems of output lag and sudden change of the torque sensor caused by larger moment of inertia of a rigid whole formed by the mass block and the bearing to be tested due to the fact that the mass block is directly pressed on the bearing are solved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts;
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the overall internal structure of the present invention;
FIG. 3 is a schematic view of the torque sensor position adjustment assembly of the present invention;
FIG. 4 is a schematic structural diagram of a measurement tool component of the present invention;
FIG. 5 is a schematic view of the construction of the spindle unit of the present invention;
FIG. 6 is a schematic diagram of an experiment in which a thin wire suspension applies an axial load;
FIG. 7 is a schematic diagram of an experiment of a spindle unit with a mass directly pressing against a bearing to apply an axial load;
the reference numbers are as follows:
the device comprises a machine base 1, a working platform 2, an operation screen 3, a torque sensor 4, a torque sensor 5, a torque sensor position adjusting component 6, a measuring tool component 7, a spindle component 8, a mass block 51, a lead screw 52, a nut mounting base 53, a torque sensor support 54, a manual displacement platform 55, a torque sensor mounting plate 56, a tool mechanical interface 56, a guide rail 57, a bearing inner ring pressing plate 61, a bearing outer ring pressing plate 62, a bearing to be measured 63, a bearing outer ring supporting seat 64, a driving shaft 71 and a coded disc 72.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: as shown in fig. 1-5, a bearing friction torque measuring instrument capable of applying an axial load comprises an operation platform 2, a torque sensor 4, a torque sensor position adjusting component 5, a measuring tool component 6, a spindle component 7, a mass block 8 and a hanging wire, wherein the torque sensor position adjusting component 5 is arranged above the operation platform 2, a torque sensor bracket 53 which can move up and down is fixedly connected to the torque sensor position adjusting component 5, the torque sensor bracket 53 is fixedly connected to and provided with the torque sensor 4, the operation platform 2 is provided with the measuring tool component 6, and the spindle component 7 is arranged below the measuring tool component 6;
the torque sensor position adjusting component 5 comprises a screw 51, a nut, a manual displacement platform 54, a torque sensor mounting plate 55 and a tool mechanical interface 56, wherein the nut is connected to the middle of the screw 51 and is arranged in a nut mounting seat 52, the nut mounting seat 52 is connected with a guide rail 57 through a sliding block, the guide rail 57 is mounted on two sides of the mounting frame, so that the effect of rotating the screw 51 and moving the nut up and down can be realized, the nut mounting seat 52 is fixedly connected with a torque sensor support 53, the torque sensor 4 is mounted on the torque sensor support 53, the torque sensor 4 is connected with the measuring tool component 6 through the tool mechanical interface 56, and the up-and-down movement of the torque sensor mounting plate 55 can facilitate the mounting of a bearing to be measured 63 and the connection of the tool mechanical interface 56 and the measuring tool component 6;
in some disclosures, a manual displacement platform 54 is connected between the torque sensor bracket 53 and the torque sensor mounting plate 55, and fine adjustment of displacement of the torque sensor 4 in the horizontal direction can be realized by adjusting two knobs on the manual displacement platform 54, so that the tool mechanical interface 56 is conveniently connected with the measurement tool part 6.
The measuring tool component 6 comprises a bearing outer ring supporting seat 64, a bearing outer ring pressing plate 62 and a bearing inner ring pressing plate 61 are installed on the bearing outer ring supporting seat 64, a bearing 63 to be tested is installed between the bearing outer ring supporting seat 64 and the bearing inner ring pressing plate 61, a tool mechanical interface 56 is connected to the bearing inner ring pressing plate 61, an axial counterweight is connected to the lower portion of the bearing inner ring pressing plate 61 and used for applying axial force to the bearing 63 to be tested, the bearing outer ring supporting seat 64 is connected with a driving shaft 71 in the spindle component 7, and the driving shaft 71 is driven to rotate through a motor.
The specific operation steps of the device are as follows: the torque sensor support 53 is lifted, the bearing 63 to be tested is installed in the measuring tool part 6, the torque sensor support 53 is adjusted to a proper position after the bearing 63 to be tested is installed, the bearing inner ring pressing plate 61 is connected with the tool mechanical interface 56, the bearing outer ring is driven to rotate through the driving shaft 71 to measure the friction force of the bearing through the torque sensor 4 when the motor is started, and meanwhile, an axial counterweight is connected to the lower portion of the bearing inner ring pressing plate 61 and used for applying axial force to the bearing 63 to be tested to guarantee the load testing effect.
Example 2: as shown in fig. 1 to 5, a bearing friction torque measuring instrument capable of applying an axial load includes a machine base 1, a work platform 2, an operation screen 3, a torque sensor 4, a torque sensor position adjusting part 5, a measuring tool part 6, a spindle part 7, a mass block 8, and a suspension wire. The machine base 1, the operation platform 2 and the torque sensor position adjusting part 5 are connected from bottom to top in sequence, the operation screen 3 is connected with the front of the machine base 1, the torque sensor 4 is arranged on the torque sensor position adjusting part 5, the main shaft part 7 is fixed below the operation platform 2 and is connected with the measuring tool part 6, the lower mass block 8 and the hanging wire are connected, the torque sensor 4 is a static torque sensor, the torque sensor position adjusting part 5 is used for adjusting the displacement of the torque sensor 4 in the three-axis direction of the space, so that the center axis of the torque sensor 4 is overlapped with the center axis of the main shaft part 7, the measuring tool part 6 is used for clamping the bearing 63 to be measured, the main shaft part 7 is used for driving the bearing 63 to be measured to rotate, and the mass block 8 and the hanging wire are used for providing axial load.
The torque sensor position adjusting component 5 comprises a hand wheel, a clamping block, a lead screw 51, a lock nut, a paired angular contact ball bearing, a fixed side bearing seat, a shell, a nut mounting seat 52, a supporting side bearing seat, a deep groove ball bearing, a shaft clamp spring, a torque sensor support 53, a manual displacement platform 54, a torque sensor mounting plate 55, a coupler, a tooling mechanical interface 56, a limiting rubber pier, a sliding block, a guide rail 57, a limiting rubber pier and a mounting frame. The combination of the screw rod 51 and the nut is used for adjusting the displacement of the torque sensor 4 in the vertical direction, the upper end of the screw rod 51 is connected with paired angular contact ball bearings, the paired angular contact ball bearings are arranged in fixed side bearings and are locked by locking nuts, the fixed side bearings are fixedly connected with the mounting frame, the lower end of the screw rod 51 is connected with the deep groove ball bearings, the deep groove ball bearings are arranged in support side bearings and limit the axial displacement of the deep groove ball bearings by using snap springs for shafts, the support side bearings are fixedly connected with the mounting frame, the middle part of the screw rod 51 is connected with the nut, the nut is arranged in a nut mounting seat 52, the nut mounting seat 52 is connected with guide rails 57 through sliding blocks, the guide rails 57 are arranged on two sides of the mounting frame, so that the effect of rotating the screw rod 51 and moving up and down of the nut can be realized, the clamping block is fixed at the upper end of the mounting frame, the screw rod 51 can be locked by screwing the clamping block through bolts, so that the torque sensor 4 is fixed at a certain height;
spacing rubber mound and spacing rubber mound are installed in both ends about the mounting bracket, can carry on spacingly to torque sensor support 53, thereby carry on spacingly to torque sensor 4's level, screw mount pad 52 and torque sensor support 53 rigid coupling, torque sensor 4 and torque sensor mounting panel 55 rigid coupling, be connected with manual displacement platform 54 between torque sensor support 53 and the torque sensor mounting panel 55, can realize the fine setting of the displacement in the torque sensor 4 horizontal direction through two knobs on the manual displacement platform 54 of adjustment, torque sensor 4, shaft coupling and frock mechanical interface 56 down connect gradually from last, the horizontal displacement of adjustment torque sensor 4 and its high ability of descending make frock mechanical interface 56 be connected with measurement frock part 6.
The measuring tool component 6 comprises a bearing inner ring pressing plate 61, a bearing outer ring pressing plate 62, a bearing 63 to be measured, a locking nut and a bearing outer ring supporting seat 64, wherein the bearing inner ring pressing plate 61, the bearing 63 to be measured and the locking nut are sequentially connected from top to bottom, and the bearing outer ring supporting seat 64, the bearing 63 to be measured and the bearing outer ring pressing plate 62 are sequentially connected from bottom to top. The bearing inner ring pressing plate 61 is connected with the tooling mechanical interface 56, connected with the mass block 8 and the hanging wire, and the loading of the axial load is carried out in a mode of hanging the mass block 8 and the hanging wire, so that the bearing 63 to be tested and the mass block 8 are separated, the problems of output lag and sudden change of the torque sensor 4 caused by the larger moment of inertia of the rigid whole formed by the mass block 8 and the bearing 63 to be tested due to the fact that the mass block 8 is directly pressed on the bearing are avoided, and the bearing outer ring supporting seat 64 is connected with the driving shaft 71 in the main shaft part 7;
in some disclosures, the mass block 8 is rotationally connected with the bearing inner ring pressing plate 61 through the rotating shaft, so that the design can avoid the problems of output lag and sudden change of the torque sensor 4 caused by the fact that the mass block 8 is directly pressed on the bearing and the rigid integral formed by the mass block 8 and the bearing 63 to be tested has larger rotational inertia, and meanwhile, the problem that the axial pressure of the bearing 63 to be tested is changed and the test result is influenced due to the fact that the hanging wire is suspended and shaken in the operation process of equipment is avoided.
The main shaft part 7 comprises a driving shaft 71, a hand-held disc, a shaft sleeve, a bearing cover, an adjusting gasket, an angular contact ball bearing, a bearing sleeve, an angular contact ball bearing, a coded disc shell, a coded disc 72, a motor bracket, a first gear, a wire fixing cover, a motor, a deep groove ball bearing, a hole snap spring and a second gear. The operation platform 2, the bearing sleeve, the code disc shell, the motor support and the wire fixing cover are sequentially connected from top to bottom. The driving shaft 71 is in a hollow structure, a space is reserved for the mass block 8 and the suspension wire, the driving shaft 71 is connected with an angular contact ball bearing and an angular contact ball bearing, the angular contact ball bearing and the angular contact ball bearing are arranged in a bearing sleeve, and an adjusting gasket and a bearing cover are connected to the angular contact ball bearing to limit axial displacement of the angular contact ball bearing and the angular contact ball bearing. The upper end of the driving shaft 71 is connected with a hand-held disc, the hand-held disc is separated from an angular contact ball bearing through a shaft sleeve, the lower end of the driving shaft 71 is connected with a deep groove ball bearing, the deep groove ball bearing is arranged in a motor support and limits axial displacement of the deep groove ball bearing through a hole embedded in the motor support by a snap spring, a motor output shaft is downwards installed on the motor support, the lower ends of the motor output shaft and the driving shaft 71 are respectively connected with a gear II and a gear I, the gear II is meshed with the gear I, therefore, the motor output shaft can rotate to drive the driving shaft 71 to rotate, the driving shaft 71 is provided with a coded disc 72, and the rotating speed of the driving shaft 71 can be detected.
Preferably, the output shaft of the motor and the drive shaft 71 take the form of a parallel arrangement.
Preferably, the middle part of the wire fixing cover is provided with a small hole, so that fluctuation of data collected by the torque sensor 4 caused by the shaking of the mass block 8 and the hanging wire can be avoided.
Preferably, the use of manual displacement platform 54 allows fine tuning of torque sensor 4 water, improving the accuracy of the alignment of the shaft in torque sensor 4 with drive shaft 71.
Example 3: as shown in fig. 6-7, the axial load is applied by thin line suspension, the test result shows that the value of the measured bearing friction torque is concentrated at about 0.05mNm, and the real level of the bearing friction torque can be well reflected by the concentrated and stable test data;
the method that the mass block is directly pressed on the bearing to apply the axial load is selected, the numerical value of the friction torque of the bearing is unstable and reaches 0.3mNm at most, the fluctuation range is large, and the true level of the friction torque of the bearing cannot be intuitively reflected;
the types of the bearings to be tested adopted by the two schemes are 618/5 produced by SKF.
Axial load is applied through the experiment in comparison with a wire hanging suspension mode, the bearing to be tested is separated from the mass block, and the problems of output lag and mutation of the torque sensor caused by the fact that the mass block is directly pressed on the bearing and the rigidity formed by the mass block and the bearing to be tested is integrally changed can be obviously improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed.
Claims (10)
1. A bearing friction torque measuring instrument capable of applying axial load comprises a torque sensor (4) and a measuring tool component (6), and is characterized in that the measuring tool component (6) comprises a bearing outer ring supporting seat (64) and a bearing inner ring pressing plate (61), the bearing inner ring pressing plate (61) is used for mounting a test bearing and is in interference fit with an inner ring of the test bearing, the bearing outer ring supporting seat (64) and the bearing inner ring pressing plate (61) are coaxially arranged, and the inner wall of the bearing outer ring supporting seat is in interference fit with an outer ring of the test bearing; one end of the bearing inner ring pressing plate (61) is connected with the torque sensor (4), and the other end of the bearing inner ring pressing plate is connected with the radial loading mechanism which is flexibly connected with the test bearing.
2. The bearing friction torque measuring instrument capable of applying the axial load is characterized in that the radial loading mechanism is a hydraulic loading system, and the radial loading mechanism is in rotational connection with a bearing inner ring pressure plate (61).
3. The bearing friction torque measuring instrument capable of applying the axial load according to claim 1, wherein the radial loading mechanism is arranged below the bearing inner ring pressing plate (61), the radial loading mechanism comprises a mass block (8) and a hanging wire, and the mass block (8) is connected with the bearing inner ring pressing plate (61) through a flexible hanging wire.
4. The bearing friction torque measuring instrument capable of applying the axial load according to claim 1, wherein a main shaft component (7) is arranged below the bearing outer ring supporting seat (64), the main shaft component (7) comprises a driving shaft (71), and the driving shaft (71) is fixedly connected with the bearing outer ring supporting seat (64).
5. An axial load bearing friction torque measuring instrument according to claim 4, wherein the drive shaft (71) is mounted with a code wheel (72).
6. The bearing friction torque measuring instrument capable of applying the axial load is characterized in that a torque sensor position adjusting component (5) is arranged on the side surface of the torque sensor (4), the torque sensor position adjusting component (5) comprises a torque sensor mounting plate (55) capable of moving in three axes of a three-dimensional coordinate system, and the torque sensor (4) is mounted on the torque sensor mounting plate (55).
7. The axial load bearing friction torque measuring instrument according to claim 6, wherein the torque sensor mounting plate (55) is driven by a screw rod to move up and down and to move horizontally.
8. An axial load applicable bearing friction torque measuring instrument according to claim 4, characterized in that the drive shaft (71) takes a hollow configuration.
9. The bearing friction torque measuring instrument capable of applying the axial load according to claim 8, wherein a wire fixing cover is arranged below the driving shaft (71), and a through hole for a hanging wire to pass through is formed in the wire fixing cover.
10. A method for applying axial load to a bearing friction torque measuring instrument is characterized in that the axial load and a bearing are connected by adopting a rotary connection or a flexible rope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211070671.6A CN115541083A (en) | 2022-08-31 | 2022-08-31 | Bearing friction torque measuring instrument capable of applying axial load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211070671.6A CN115541083A (en) | 2022-08-31 | 2022-08-31 | Bearing friction torque measuring instrument capable of applying axial load |
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| CN115541083A true CN115541083A (en) | 2022-12-30 |
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| CN202211070671.6A Pending CN115541083A (en) | 2022-08-31 | 2022-08-31 | Bearing friction torque measuring instrument capable of applying axial load |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509814A (en) * | 2008-10-30 | 2009-08-19 | 洛阳轴研科技股份有限公司 | Miniature bearing dynamic friction moment measurement instrument |
| CN103335845A (en) * | 2013-06-21 | 2013-10-02 | 东南大学 | Device for testing axial bearing capacity of conical dynamic-pressure spiral groove bearing |
| CN203490013U (en) * | 2013-09-24 | 2014-03-19 | 宁波更大集团有限公司 | System for measuring friction torque of bearing |
| CN106840076A (en) * | 2017-01-25 | 2017-06-13 | 黑龙江科技大学 | A kind of bearing clearance and friction torque comprehensive tester |
| CN109612616A (en) * | 2018-12-30 | 2019-04-12 | 洛阳轴承研究所有限公司 | A kind of measurement of friction torque device of angular contact radial bearing |
-
2022
- 2022-08-31 CN CN202211070671.6A patent/CN115541083A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509814A (en) * | 2008-10-30 | 2009-08-19 | 洛阳轴研科技股份有限公司 | Miniature bearing dynamic friction moment measurement instrument |
| CN103335845A (en) * | 2013-06-21 | 2013-10-02 | 东南大学 | Device for testing axial bearing capacity of conical dynamic-pressure spiral groove bearing |
| CN203490013U (en) * | 2013-09-24 | 2014-03-19 | 宁波更大集团有限公司 | System for measuring friction torque of bearing |
| CN106840076A (en) * | 2017-01-25 | 2017-06-13 | 黑龙江科技大学 | A kind of bearing clearance and friction torque comprehensive tester |
| CN109612616A (en) * | 2018-12-30 | 2019-04-12 | 洛阳轴承研究所有限公司 | A kind of measurement of friction torque device of angular contact radial bearing |
Non-Patent Citations (1)
| Title |
|---|
| 刘杭: "中小型轴承的摩擦力矩测量仪研制", 《中国优秀硕士学位论文全文数据库》, 15 January 2021 (2021-01-15), pages 15 - 19 * |
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