CN110927055B - Device and method for measuring friction coefficient between inner ring and outer ring of bearing - Google Patents
Device and method for measuring friction coefficient between inner ring and outer ring of bearing Download PDFInfo
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- CN110927055B CN110927055B CN201911361013.0A CN201911361013A CN110927055B CN 110927055 B CN110927055 B CN 110927055B CN 201911361013 A CN201911361013 A CN 201911361013A CN 110927055 B CN110927055 B CN 110927055B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
Abstract
The embodiment of the invention discloses a device and a method for measuring a friction coefficient between an inner ring and an outer ring of a bearing, wherein a bearing assembly to be measured comprises two bearings to be tested, a bushing to be tested, a rotating loading bushing, a rotating pin shaft, an inner ring of the bearing to be measured and an outer ring of the bearing to be measured; the force loading module is used for loading radial loads to the bearing outer ring and the bearing inner ring through the bearing outer ring fixing piece, so that the bearing inner ring and the bearing outer ring are contacted, and the loaded radial load value is recorded; the torque measuring module is used for measuring a load torque value borne by the bearing assembly to be measured when the bearing assembly to be measured rotates; the difference between the load torque value and the additional torque values of the two test-accompanying bearings is a corrected torque value between the inner ring and the outer ring of the bearing; the friction coefficient between the inner and outer rings of the bearing is the slope of the curve of the corrected torque value as a function of the radial load value. The embodiment of the invention can effectively eliminate the conditions of uneven stress, sliding friction interference of other components and the like, thereby effectively measuring the static friction coefficient and the dynamic friction coefficient between the inner ring and the outer ring of the bearing.
Description
Technical Field
The application relates to the technical field of measurement of friction coefficients of aviation structures, in particular to a device and a method for measuring the friction coefficient between an inner ring and an outer ring of a bearing.
Background
In the hinge structure with the bearing, if the bearing has a locking fault, the hinge must be ensured to overcome the static friction between the inner ring and the outer ring of the bearing so as to effectively slide, and the sliding is different from the sliding of the inner ring and the outer ring of the bearing and is called as secondary sliding. The safety and the reliability of the hinge structure can be effectively guaranteed by the secondary sliding pair. The friction coefficient between the inner and outer races of the bearing is critical to the calculation of the secondary slip of the hinge mechanism with the bearing. However, the friction coefficient is affected by various factors such as the material of the bearing and the rotating pin shaft, the roughness, the form and position tolerance and the like, and the actual bearing and the rotating pin shaft are required to be used for measurement.
At present, a friction coefficient measuring method for a rotating pin shaft and an equivalent friction coefficient measuring method for a rolling bearing are proposed. However, the above-mentioned measurement methods measure the friction coefficient of the first-stage sliding of the inner and outer rings of the bearing, that is, the friction coefficient of the second-stage sliding between the inner and outer rings of the bearing cannot be measured by the existing measurement methods.
Disclosure of Invention
In order to solve the technical problems, embodiments of the present invention provide a device and a method for measuring a friction coefficient between an inner ring and an outer ring of a bearing, which can effectively eliminate the situations of uneven stress, sliding friction interference of other components, and the like, thereby truly and effectively measuring a static friction coefficient and a dynamic friction coefficient between the inner ring and the outer ring of the bearing.
The embodiment of the invention provides a device for measuring the friction coefficient between an inner ring and an outer ring of a bearing, which comprises: the device comprises two supporting structures, a bearing outer ring fixing part, a force loading module, a torque motor, a torque measuring module and a bearing assembly to be tested, wherein the bearing assembly to be tested comprises two test-accompanying bearings, a test-accompanying bushing, a rotating loading bushing, a rotating pin shaft, a tested bearing inner ring and a bearing outer ring, and the bearing outer ring is nested outside the bearing inner ring;
the test-accompanying bush and the rotating loading bush are respectively arranged on two sides of the bearing inner ring, the rotating pin shaft penetrates through the bearing inner ring and shaft holes of the test-accompanying bush and the rotating loading bush, one test-accompanying bearing is nested outside the test-accompanying bush, the other test-accompanying bearing is nested outside the rotating loading bush, the supporting structures are nested outside the test-accompanying bearing in a one-to-one correspondence mode and used for fixing the test-accompanying bearing, and the bearing outer ring fixing piece is nested outside the bearing outer ring and located between the two supporting structures and used for clamping the bearing outer ring;
the force loading module is arranged on the outer side of the bearing outer ring fixing piece and used for loading radial loads to the bearing outer ring and the bearing inner ring through the bearing outer ring fixing piece so as to enable the bearing outer ring and the bearing inner ring to be in contact with each other and recording a loaded radial load value;
one end of a rotating shaft of the torque motor is embedded into the rotating loading bushing and is used for driving the bearing assembly to be tested to integrally rotate through the rotation of the rotating shaft; the torque measuring module is nested outside a rotating shaft of the torque motor, is connected with the rotating loading bushing and is used for measuring a load torque value borne by the bearing assembly to be measured when the bearing assembly rotates, and the difference between the load torque value and the additional torque values of the two test-accompanying bearings is a corrected torque value between the inner ring and the outer ring of the bearing; and the friction coefficient between the inner ring and the outer ring of the bearing is the slope of a relation curve of the correction torque value changing along with the radial load value.
Alternatively, in the friction coefficient measuring device between the inner and outer races of the bearing as described above,
the force loading module is further used for loading radial loads to the bearing outer ring and the bearing inner ring from zero, enabling the bearing outer ring and the bearing inner ring to be in contact, and recording a loaded radial load value according to a preset step length in the loading process.
Alternatively, in the friction coefficient measuring device between the inner and outer races of the bearing as described above,
the torque measuring module is further used for measuring a load torque value borne by the bearing assembly to be measured under the condition of a corresponding radial load value according to the radial load value recorded by the force loading module.
Optionally, the device for measuring a friction coefficient between an inner ring and an outer ring of a bearing as described above further includes: the test-accompanying bearing assembly that is awaited, the test-accompanying bearing assembly that is awaited includes: the test fixture comprises four test-accompanying bearings, a mandrel, four dismounting bushes and two locking nuts;
in the four shaft holes of accompanying the examination bearing of dabber embedding, the dabber middle part has the boss, and four dismantlements bushes set up between two adjacent examination bearings of accompanying and accompany between examination bearing and the boss, the fixing of two lock nut one-to-ones set up in the both ends of dabber are through lock nut and the fixed examination bearing of accompanying of dismantlement bush, two outsides of awaiting measuring the examination bearing assembly of accompanying and accompanying are accompanied the outside bearing structure of accompanying and examining through the nestification in the outside and are fixed, and two middle parts are accompanied the examination bearing and are fixed through the middle part bearing structure of nestification in its outside.
Optionally, the device for measuring a friction coefficient between an inner ring and an outer ring of a bearing as described above further includes: the middle force loading module and the two outer force loading modules;
the middle force loading modules are arranged on one side of the middle supporting structure, and the outer side force loading modules are correspondingly arranged on one side of the outer side supporting structure one by one and are arranged opposite to the middle force loading modules;
the outer force loading module is used for loading a first radial load to the corresponding outer test-accompanying bearing through the outer supporting structure, and the middle force loading module is used for loading a second radial load to the two middle test-accompanying bearings through the middle supporting structure, wherein the direction of the second radial load is opposite to that of the first radial load, and the second radial load is twice of that of the first radial load;
one end of a rotating shaft of the torque motor is embedded into one end of the mandrel and is also used for driving the mandrel and the four test-accompanying bearings to rotate through the rotation of the rotating shaft;
the torque measurement module is nested in the outside of torque motor's pivot, and is connected with the one end that the pivot was connected to the dabber, still is used for measuring the dabber with when four accompany the examination bearings rotate four accompany the additional torque value that the examination bearing received.
Alternatively, in the friction coefficient measuring device between the inner and outer races of the bearing as described above,
the outer force loading module is also used for loading a first radial load to the corresponding outer supporting structure and the outer test bearing from zero and recording a loaded first radial load value according to a preset step length in the loading process;
the middle force loading module is also used for loading a second radial load to the corresponding middle supporting structure and the two middle test-accompanying bearings from zero, and the loaded second radial load value is twice of the first radial load value;
the torque measuring module is further used for measuring additional torque values of the four test-accompanying bearings under the condition of corresponding first radial load values according to the first radial load values recorded by the outer force loading module.
Optionally, in the device for measuring the friction coefficient between the inner ring and the outer ring of the bearing as described above, the test-assistant bearing in the to-be-tested bearing assembly and the test-assistant bearing in the to-be-tested bearing assembly are the same test-assistant bearing, or are the same specification and the same batch of test-assistant bearings.
The embodiment of the invention also provides a method for measuring the friction coefficient between the inner ring and the outer ring of the bearing, which adopts the device for measuring the friction coefficient between the inner ring and the outer ring of the bearing to measure, and the method for measuring the friction coefficient comprises the following steps:
loading radial loads to a bearing outer ring and an inner ring of a bearing assembly to be tested from zero through a force loading module, enabling the bearing outer ring and the bearing inner ring to be in contact, and recording a loaded radial load value according to a preset step length in the loading process;
according to the radial load value recorded by the force loading module, measuring a load torque value borne by the bearing assembly to be tested under the condition of the corresponding radial load value through a torque measuring module;
calculating a correction torque value between an inner ring and an outer ring of a bearing in the bearing assembly to be tested according to the load torque value and additional torque values of two accompanying bearings in the bearing assembly to be tested, wherein the correction torque value is the difference between the load torque value and the additional torque values;
and obtaining the friction coefficient between the inner ring and the outer ring of the bearing according to a relation curve of the corrected torque value between the inner ring and the outer ring of the bearing along with the change of the radial load value, wherein the friction coefficient is the slope of the relation curve.
Optionally, in the method for measuring a friction coefficient between an inner ring and an outer ring of a bearing as described above, before the calculating the correction torque value, the method further includes:
loading a radial load to the to-be-tested auxiliary bearing assembly from zero through a force loading module, and recording a loaded radial load value according to a preset step length in the loading process;
and according to the radial load value recorded by the force loading module, measuring the load torque value borne by an auxiliary bearing in the auxiliary bearing assembly to be tested under the condition of the corresponding radial load value through a torque measuring module.
In order to ensure the measurement accuracy of the friction coefficient between the inner ring and the outer ring of the bearing, the device and the method for measuring the friction coefficient between the inner ring and the outer ring of the bearing provided by the embodiment of the invention need to eliminate the influence caused by relative sliding of other parts of the measuring device, eliminate the influence caused by uneven stress, eliminate the influence caused by friction of a support bearing, eliminate the influence caused by friction between the inner ring and the outer ring of the bearing and the like. Aiming at the problems, the embodiment of the invention designs a device for measuring the friction coefficient between an inner ring and an outer ring of a bearing, selects a qualified bearing with the same batch and the same specification as an auxiliary bearing in the measuring device as a test bearing for data correction, namely the auxiliary bearing in an auxiliary bearing assembly to be tested, adopts the auxiliary bearing assembly to be tested, applies a radial load on the surface of an end load body by a force loading device, the load value is 2 times of the load value of the measurement item, then slowly starts a torque loading motor 21, records an additional torque TAccompany person. The drive torque correction formula is: friction pair driving torque T-load torque value T measured by testMeasuring-0.5 additional torque TAccompany person。
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a device for measuring a friction coefficient between an inner ring and an outer ring of a bearing according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a bearing assembly under test and a corresponding support structure in the friction coefficient measuring device provided in the embodiment of FIG. 1;
FIG. 3 is a schematic structural diagram of a test-accompanied bearing assembly to be tested and a measuring device according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for measuring a friction coefficient between an inner ring and an outer ring of a bearing according to an embodiment of the present invention;
FIG. 5 is a plot of corrected torque values versus radial load values obtained in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a schematic structural diagram of a friction coefficient measuring device between an inner ring and an outer ring of a bearing according to an embodiment of the present invention, and fig. 2 is a cross-sectional view of a bearing assembly to be measured and a corresponding support structure in the friction coefficient measuring device provided in the embodiment of fig. 1. Referring to the structures shown in fig. 1 and 2, the friction coefficient measuring device between the inner ring and the outer ring of the bearing provided in the present embodiment may include: the device comprises two supporting structures 1, a bearing outer ring fixing piece 5, a force loading module 12, a torque motor 11, a torque measuring module 9 and a bearing assembly to be tested.
The bearing assembly to be tested in the embodiment of the invention comprises two test-accompanying bearings 2, a test-accompanying bush 3, a rotating loading bush 8, a rotating pin shaft 4, a tested bearing inner ring 6 and a bearing outer ring 13;
in the structure shown in fig. 2, the test assisting bush 3 and the rotating loading bush 8 are respectively arranged at two sides of the bearing inner ring 6, the rotating pin shaft 4 penetrates through the bearing inner ring 6 and shaft holes of the test assisting bush 3 and the rotating loading bush 8, one test assisting bearing 2 is nested outside the test assisting bush 3, the other test assisting bearing 2 is nested outside the rotating loading bush 8, the supporting structures 1 are nested outside the test assisting bearing 2 in a one-to-one correspondence manner and used for fixing the test assisting bearing 2, and the bearing outer ring fixing piece 5 is nested outside the bearing outer ring 13 and located between the two supporting structures 1 and used for clamping the bearing outer ring 13;
the force loading module 12 is arranged outside the bearing outer ring fixing piece 5, and for example, comprises a loading motor 12 for applying force from top to bottom, and is used for loading a radial load to the bearing outer ring 13 and the bearing inner ring 6 through the bearing outer ring fixing piece 5, so that the bearing outer ring 13 and the bearing inner ring are in contact, and recording a loaded radial load value;
one end of a rotating shaft 10 of a torque motor 11 is embedded into the rotating loading bushing 8 and is used for driving the bearing assembly to be tested to integrally rotate through the rotation of the rotating shaft 10; the torque measuring module 9 is nested outside a rotating shaft 10 of the torque motor 11, is connected with the rotating loading bushing 8, and is used for measuring a load torque value received by a bearing assembly to be measured when the bearing assembly rotates, and the difference between the load torque value and the additional torque values of the two test-accompanying bearings 2 is a corrected torque value between the inner ring and the outer ring of the bearing; the friction coefficient between the inner ring and the outer ring of the bearing is the slope of a relation curve of the correction torque value changing along with the radial load value.
In the embodiment of the present invention, the force loading module 12 may further function as: and loading radial loads to the bearing outer ring 13 and the bearing inner ring 6 from zero to enable the bearing outer ring 13 and the bearing inner ring 6 to be in contact, and recording the loaded radial load value according to a preset step length in the loading process.
In the embodiment of the present invention, the torque measurement module 9 may further function as: and measuring the load torque value of the bearing assembly to be tested under the condition of the corresponding radial load value according to the radial load value recorded by the force loading module 8.
In the embodiment of the invention, in order to ensure the measurement accuracy of the friction coefficient between the inner ring and the outer ring of the bearing, the influence caused by relative sliding of other parts of the measuring device, the influence caused by uneven stress, the influence caused by friction of the support bearing, the influence caused by friction between the inner ring and the outer ring of the bearing and the like need to be eliminated.
In order to solve the problems, the testing device provided by the invention mainly comprises a torque motor, a force loading module, a supporting structure, an accompanying test bearing, a rotating pin shaft, an accompanying test bush and the like. And a special tool is adopted to clamp the inner ring and the outer ring of the bearing so as to ensure that the inner ring and the outer ring do not deform to influence the test result. And starting the motor, slowly rotating the inner ring of the bearing, and recording the load torque value. Meanwhile, a tool is fixed on the outer ring of the bearing to slowly load a radial load, so that the inner ring and the outer ring of the test bearing are in contact, and a radial load value is recorded. Loading the same load, measuring the rolling friction torque of the different loads of the test-accompanying bearings in the same batch on a tool only provided with the test-accompanying bearings, subtracting the additional torque value generated by the test-accompanying bearings from the curve drawn by the device, and calculating and drawing a friction factor curve according to the corrected load torque value and the radial load value.
Optionally, fig. 3 is a schematic structural diagram of a to-be-tested bearing assembly and a measuring apparatus according to an embodiment of the present invention. The device for measuring the friction coefficient between the inner ring and the outer ring of the bearing provided by the embodiment of the invention can also comprise: the test-accompanying bearing assembly that awaits measuring includes: four test-accompanying bearings 19, a mandrel 17, four dismounting bushes 16 and two locking nuts 18;
in the four shaft holes of accompanying examination of dabber 17 embedding bearing 19, dabber 17 middle part has the boss, four dismantlement bushes 16 set up between two adjacent accompanying examination bearings 19 and accompanying examination bearing 19 and the boss between, the fixed of two lock nut 18 one-to-ones set up in dabber 17's both ends are through lock nut 18 and dismantle bush 16 fixed examination bearing 19 of accompanying examination, two outsides of the examination bearing subassembly of accompanying examination waiting to be measured accompany the one-to-one of examination bearing through the nestification outside the examination bearing outside supporting structure 15 fixed, two middle parts are accompanied the examination bearing and are constructed fixedly through the nestification at its outside middle part supporting structure 14.
In the test-accompanied bearing assembly shown in fig. 3, the force loading module, the torque motor and the torque measurement module can be used for force loading and torque measurement, for example, including: the middle force loading module and the two outer force loading modules;
the middle force loading module is arranged at one side (for example, at the upper side) of the middle support structure 14, and the outer force loading modules are arranged at one side of the outer support structure 15 in a one-to-one correspondence manner and are arranged opposite to the middle force loading module (for example, at the lower side);
the outer force loading module is used for loading a first radial load Fr to corresponding outer test bearings through the outer supporting structure 15, and the middle force loading module is used for loading second radial loads 2Fr to the two middle test bearings through the middle supporting structure 14, wherein the second radial loads 2Fr are opposite to the first radial loads Fr in direction, and the second radial loads 2Fr are twice as large as the first radial loads Fr; it should be noted that the outer force loading module only loads the first radial load Fr to one test-accompanying bearing, the middle force loading module only loads the second radial load 2Fr to two test-accompanying bearings, and the stress of each test-accompanying bearing is consistent.
One end of a rotating shaft of the torque motor is embedded into one end of the mandrel 17 and is also used for driving the mandrel and the four test-accompanying bearings to rotate through the rotation of the rotating shaft;
the torque measurement module is nested outside the rotating shaft of the torque motor, is connected with one end of the rotating shaft connected with the mandrel 17, and is also used for measuring additional torque values of the four test-accompanying bearings when the mandrel and the four test-accompanying bearings rotate, and the additional torque values of the two test-accompanying bearings are half of the additional torque values of the four test-accompanying bearings obtained through measurement.
In the embodiment of the invention, the additional torque values of the two test-assistant bearings can be obtained through the test-assistant bearing assembly to be tested shown in fig. 3 and the mode.
Similar to the above embodiments, the outboard force loading module may also function to: loading a first radial load to the corresponding outer side supporting structure and the outer side test bearing from zero, and recording a loaded first radial load value according to a preset step length in the loading process;
the middle force loading module can also function as: loading a second radial load to the corresponding middle supporting structure and the two middle test-accompanying bearings from zero, and enabling the loaded second radial load value to be twice as large as the first radial load value;
the torque measurement module may also function to: according to the first radial load value recorded by the outer force loading module, the additional torque values of the four test-assistant bearings under the condition of the corresponding first radial load value are measured, and therefore the additional torque values of the two test-assistant bearings under the condition of the corresponding radial load value are calculated.
Optionally, in the embodiment of the present invention, the test-accompanying bearing 19 in the to-be-tested bearing assembly and the test-accompanying bearing 2 in the to-be-tested bearing assembly may be the same test-accompanying bearing, or may be the same specification and batch of test-accompanying bearings; i.e. it is required to ensure that the test bearings 19 in the tested bearing assembly have the same performance as the test bearings 2 in the tested bearing assembly.
The implementation manner of the embodiment of the invention can be as follows:
1, the bearing is not disassembled, the test bearing is directly installed into the bearing outer ring fixing tool 5, the tool is adopted to clamp the tested bearing outer ring, and the test bearing outer ring is kept static.
And 2, starting the torque loading motor, slowly rotating the inner ring of the bearing, and recording a load torque value.
And 3, slowly applying a radial load on the outer ring fixing tool 5 by the force loading module, and recording a radial load value.
And 4, measuring the rolling friction torque of the bearings subjected to the test in the same batch under different loads on the tool only provided with the bearings subjected to the test, removing the additional torque value generated by the bearings subjected to the test through data processing, and calculating and drawing a friction factor curve according to the corrected load torque value and the radial load value.
The implementation manner of removing the additional torque value generated by the test-accompanying bearing can be as follows:
selecting qualified bearings with the same batch and the same specification as the side measurement item test-accompanying bearings as the test-accompanying bearings for data correction, wherein the mounting mode is as shown in figure 3, applying radial load on the surface of a middle load, the load value is 2 times of the load value of the measurement item, slowly starting a motor, and recording the driving torque TAccompany person. The drive torque correction formula is: friction pair driving torque T-driving torque T measured by testMeasuring-0.5 driving torque TAccompany person。
And removing the load torque value generated by the test-accompanying bearing 19, and drawing a relation curve of the load torque/R and the radial load according to the corrected load torque value and the radial load value, wherein the slope of the curve is the friction coefficient.
Hair brushIn order to ensure the measurement accuracy of the friction coefficient between the inner ring and the outer ring of the bearing, the device provided by the embodiment needs to eliminate the influence caused by relative sliding of other parts of the measurement device, eliminate the influence caused by uneven stress, eliminate the influence caused by friction of the support bearing, eliminate the influence caused by friction between the inner ring and the outer ring of the bearing, and the like. Aiming at the problems, the embodiment of the invention designs a device for measuring the friction coefficient between an inner ring and an outer ring of a bearing, selects a qualified bearing with the same batch and the same specification as an auxiliary bearing in the measuring device as a test bearing for data correction, namely the auxiliary bearing in an auxiliary bearing assembly to be tested, adopts the auxiliary bearing assembly to be tested, applies a radial load on the surface of an end load body by a force loading device, the load value is 2 times of the load value of the measurement item, then slowly starts a torque loading motor 21, records an additional torque TAccompany person. The drive torque correction formula is: friction pair driving torque T-load torque value T measured by testMeasuring-0.5 additional torque TAccompany person。
Based on the device for measuring the friction coefficient between the inner ring and the outer ring of the bearing provided by the embodiment of the invention, the embodiment of the invention also provides a method for measuring the friction coefficient between the inner ring and the outer ring of the bearing, the method for measuring the friction coefficient adopts the device for measuring the friction coefficient between the inner ring and the outer ring of the bearing provided by any embodiment of the invention to measure the torsion-tension relationship, as shown in fig. 4, the method for measuring the friction coefficient between the inner ring and the outer ring of the bearing provided by the embodiment of the invention comprises the following steps:
step 1, loading radial loads to a bearing outer ring and a bearing inner ring of a bearing assembly to be tested from zero through a force loading module, enabling the bearing outer ring and the bearing inner ring to be in contact, and recording a loaded radial load value according to a preset step length in a loading process;
and 4, obtaining the friction coefficient between the inner ring and the outer ring of the bearing according to a relation curve of the correction torque value between the inner ring and the outer ring of the bearing along with the change of the radial load value, wherein the friction coefficient is the slope of the relation curve.
As shown in fig. 5, the relationship curve of the correction torque value with the radial load value obtained in the embodiment of the present invention is shown, the load torque in fig. 5 is the corrected load torque value, that is, the difference between the load torque value measured in step 2 and the additional torque values of the two trial bushings, and the slope of the friction coefficient relationship curve is the friction coefficient.
Optionally, the measurement method provided in the embodiment of the present invention, before calculating the corrected torque value, may further include:
s1, loading a radial load to the test-accompanying bearing assembly to be tested from zero through a force loading module, and recording a loaded radial load value according to a preset step length in the loading process;
and S2, according to the radial load value recorded by the force loading module, measuring an additional torque value borne by an auxiliary bearing in the auxiliary bearing assembly to be tested under the condition of the corresponding radial load value through the torque measuring module.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A friction coefficient measuring device between an inner ring and an outer ring of a bearing is characterized by comprising: the device comprises two supporting structures, a bearing outer ring fixing part, a force loading module, a torque motor, a torque measuring module and a bearing assembly to be tested, wherein the bearing assembly to be tested comprises two test-accompanying bearings, a test-accompanying bushing, a rotating loading bushing, a rotating pin shaft, a tested bearing inner ring and a bearing outer ring, and the bearing outer ring is nested outside the bearing inner ring;
the test-accompanying bush and the rotating loading bush are respectively arranged on two sides of the bearing inner ring, the rotating pin shaft penetrates through the bearing inner ring and shaft holes of the test-accompanying bush and the rotating loading bush, one test-accompanying bearing is nested outside the test-accompanying bush, the other test-accompanying bearing is nested outside the rotating loading bush, the supporting structures are nested outside the test-accompanying bearing in a one-to-one correspondence mode and used for fixing the test-accompanying bearing, and the bearing outer ring fixing piece is nested outside the bearing outer ring and located between the two supporting structures and used for clamping the bearing outer ring;
the force loading module is arranged on the outer side of the bearing outer ring fixing piece and used for loading radial loads to the bearing outer ring and the bearing inner ring through the bearing outer ring fixing piece so as to enable the bearing outer ring and the bearing inner ring to be in contact with each other and recording a loaded radial load value;
one end of a rotating shaft of the torque motor is embedded into the rotating loading bushing and is used for driving the bearing assembly to be tested to integrally rotate through the rotation of the rotating shaft; the torque measuring module is nested outside a rotating shaft of the torque motor, is connected with the rotating loading bushing and is used for measuring a load torque value borne by the bearing assembly to be measured when the bearing assembly rotates, and the difference between the load torque value and the additional torque values of the two test-accompanying bearings is a corrected torque value between the inner ring and the outer ring of the bearing; the friction coefficient between the inner ring and the outer ring of the bearing is the slope of a relation curve of the correction torque value changing along with the radial load value;
the friction coefficient measuring device further includes: the test assisting device comprises a bearing assembly to be tested, a middle force loading module and two outer force loading modules;
wherein, the test accompanying bearing assembly that awaits measuring includes: the test fixture comprises four test-accompanying bearings, a mandrel, four dismounting bushes and two locking nuts; the core shaft is embedded into shaft holes of four test-accompanying bearings, a boss is arranged in the middle of the core shaft, four dismounting bushings are arranged between two adjacent test-accompanying bearings and between the test-accompanying bearings and the boss, the two locking nuts are fixedly arranged at two ends of the core shaft in a one-to-one correspondence manner, the test-accompanying bearings are fixed through the locking nuts and the dismounting bushings, the two outer sides of the to-be-tested bearing assembly are fixed through outer side supporting structures which are embedded outside the outer side test-accompanying bearings in a one-to-one correspondence manner, and the two middle test-accompanying bearings are fixed through middle supporting structures which are embedded outside the two middle test-accompanying bearings;
the middle force loading modules are arranged on one side of the middle supporting structure, and the outer side force loading modules are correspondingly arranged on one side of the outer side supporting structure one by one and are arranged opposite to the middle force loading modules;
the outer force loading module is used for loading a first radial load to the corresponding outer test-accompanying bearing through the outer supporting structure, and the middle force loading module is used for loading a second radial load to the two middle test-accompanying bearings through the middle supporting structure, wherein the direction of the second radial load is opposite to that of the first radial load, and the second radial load is twice of that of the first radial load;
one end of a rotating shaft of the torque motor is embedded into one end of the mandrel and is also used for driving the mandrel and the four test-accompanying bearings to rotate through the rotation of the rotating shaft;
the torque measuring module is nested outside a rotating shaft of the torque motor, is connected with one end of a mandrel connecting with the rotating shaft, and is also used for measuring additional torque values borne by the four test-accompanying bearings when the mandrel and the four test-accompanying bearings rotate; and calculating to obtain the additional torque value of the two test-assistant bearings, which is half of the additional torque value of the four measured test-assistant bearings.
2. A friction coefficient measuring device between an inner race and an outer race of a bearing according to claim 1,
the force loading module is further used for loading radial loads to the bearing outer ring and the bearing inner ring from zero, enabling the bearing outer ring and the bearing inner ring to be in contact, and recording a loaded radial load value according to a preset step length in the loading process.
3. A friction coefficient measuring device between an inner race and an outer race of a bearing according to claim 2,
the torque measuring module is further used for measuring a load torque value borne by the bearing assembly to be measured under the condition of a corresponding radial load value according to the radial load value recorded by the force loading module.
4. A friction coefficient measuring device between an inner race and an outer race of a bearing according to claim 1,
the outer force loading module is also used for loading a first radial load to the corresponding outer supporting structure and the outer test bearing from zero and recording a loaded first radial load value according to a preset step length in the loading process;
the middle force loading module is also used for loading a second radial load to the corresponding middle supporting structure and the two middle test-accompanying bearings from zero, and the loaded second radial load value is twice of the first radial load value;
the torque measuring module is further used for measuring additional torque values of the four test-accompanying bearings under the condition of corresponding first radial load values according to the first radial load values recorded by the outer force loading module.
5. The device for measuring the friction coefficient between the inner ring and the outer ring of the bearing as claimed in claim 1, wherein the test-accompanying bearing in the test-accompanying bearing assembly and the test-accompanying bearing in the test-accompanying bearing assembly are the same test-accompanying bearing or the same specification and the same batch of test-accompanying bearings.
6. A method for measuring a friction coefficient between inner and outer races of a bearing, which comprises the steps of:
loading radial loads to a bearing outer ring and an inner ring of a bearing assembly to be tested from zero through a force loading module, enabling the bearing outer ring and the bearing inner ring to be in contact, and recording a loaded radial load value according to a preset step length in the loading process;
according to the radial load value recorded by the force loading module, measuring a load torque value borne by the bearing assembly to be tested under the condition of the corresponding radial load value through a torque measuring module;
calculating a correction torque value between an inner ring and an outer ring of a bearing in the bearing assembly to be tested according to the load torque value and additional torque values of two accompanying bearings in the bearing assembly to be tested, wherein the correction torque value is the difference between the load torque value and the additional torque values;
and obtaining the friction coefficient between the inner ring and the outer ring of the bearing according to a relation curve of the corrected torque value between the inner ring and the outer ring of the bearing along with the change of the radial load value, wherein the friction coefficient is the slope of the relation curve.
7. A method of measuring a coefficient of friction between an inner race and an outer race of a bearing according to claim 6, wherein before calculating the corrective torque value, the method further comprises:
loading a radial load to the to-be-tested auxiliary bearing assembly from zero through a force loading module, and recording a loaded radial load value according to a preset step length in the loading process;
and according to the radial load value recorded by the force loading module, measuring the load torque value borne by an auxiliary bearing in the auxiliary bearing assembly to be tested under the condition of the corresponding radial load value through a torque measuring module.
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| CN111929233B (en) * | 2020-05-14 | 2023-03-31 | 北京工业大学 | Friction coefficient measuring device for measuring periodic deformation of material |
| CN112683776B (en) * | 2020-11-27 | 2024-03-26 | 中国汽车工程研究院股份有限公司 | Sliding rail type objective table of material friction abnormal sound test bed |
| CN114659788B (en) * | 2022-05-23 | 2022-08-09 | 哈尔滨科锐同创机模制造有限公司 | Friction testing device of bearing tester |
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