CN102539039B - Method and equipment for measuring friction torque of radially loaded bearing - Google Patents

Method and equipment for measuring friction torque of radially loaded bearing Download PDF

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Publication number
CN102539039B
CN102539039B CN201110430320.7A CN201110430320A CN102539039B CN 102539039 B CN102539039 B CN 102539039B CN 201110430320 A CN201110430320 A CN 201110430320A CN 102539039 B CN102539039 B CN 102539039B
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measurement
module
displacement
bearing
load
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CN102539039A (en
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侯之超
陶润
戴诗亮
童炜
何晓阳
徐俊
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LITENS AUTOMOTIVE (SUZHOU) CO Ltd
Tsinghua University
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LITENS AUTOMOTIVE (SUZHOU) CO Ltd
Tsinghua University
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Abstract

The invention relates to a measuring method and a measuring instrument for a rolling bearing. The measuring instrument comprises a loading module for radially loading to a bearing to be measured, a heating module for controlling the temperature of the bearing to be measured, a measuring module for measuring the friction torque, and a driving module for driving the measuring module. In the invention, the loading module is connected with the measuring module to exert an acting force on the measuring module. With the measuring method and measuring instrument, large-range radial load is exerted to the bearing, and the system error in the measurement on micro friction torque can be kept in an acceptable range under large radial load.

Description

The measuring method of radial stand under load bearing frictional torque and equipment
Technical field
The present invention relates to measuring method and the measuring equipment of bearing, relate to the method, particularly displacement method and the measuring equipment that the bearing of radial stand under load are carried out to measurement of friction torque at various load, various rotating speed and various temperature specifically.
Background technology
From present technology, the method measuring bearing frictional torque can be divided into direct friction torgue measurement method, trimming moment mensuration and indirect measurement of friction torque method.See " the weary information inference of Frictional Moment for Rolling Bearings " (Science Press, in July, 2010 first published).
Patent " bearing under micro-loading, the measure of frictional moment of different rotational speed and the survey meter " (patent No. 200610052086.8 publication number CN1865878), load radial load mainly in order to there be certain pressure between bearing enclose, be convenient to produce moment of friction, dynamometer records radial load and bearing friction peripheral force sum, radial force excessive rear bearing friction peripheral force has not just measured, so can not load large radial load completely.
Patent " a kind of proving installation measuring bearing frictional torque " (patent No. 200710040612.3 publication number CN101050986), only for the measurement of no-load bearing frictional torque.
Patent " micro-bearing friction torgue measuring instrument " (patent No. 200710041970.6 publication number CN101067578), only for the measurement of no-load bearing frictional torque.
Patent " a kind of non-contact type bearing starting friction torgue measurement method and measuring instrument " (application number 200710054386.4 publication number CN101303261), can only measure bearing startup friction torque, can not apply radial load.
Patent " a kind of Miniature bearing dynamic friction moment measurement instrument " (patent No. 200810230784.1 publication number CN101509814), only measures for the bearing frictional torque of axial load.Patent " surveying instrument of bearing moment of friction under axially different load, rotating speed " (application number 200910096442.X) is only measured for the bearing frictional torque of axial load
Patent the friction torque test device of rolling bearing " under the low temperature " (patent No. 200110043678.4 publication number CN102175369A), can only measure bearing startup friction torque.
So far the measuring equipment that can measure the moment of friction of bearing at different rotating speeds, temperature being subject to high radial load is not had both at home and abroad.
Summary of the invention
The object of the invention is, provide a kind of measuring method that can measure bearing frictional torque and measuring equipment, described method and apparatus achieves the high-acruracy survey in different radial load, different rotating speeds and temperature conditions lower bearing moment of friction.
According to the present invention, this object is realized by following measuring equipment, and a kind of measuring equipment of radial stand under load bearing frictional torque, comprising:
For carrying out the load-on module of radial loaded to measured bearing;
For carrying out temperature controlled heating module to measured bearing;
For measuring the measurement module of moment of friction, this measurement module comprises measurement axle, and the applying of radial load, to the measurement of moment of friction, specifically refers to the noiseless effect of the measurement of displacement herein;
And for driving the driver module of measurement module, the size of radial force is had no effect to providing rotating speed accurately;
Wherein, described load-on module is connected with described measurement module, thus applies acting force to described measurement module.
In a preferred embodiment, load-on module and measurement module keep at a certain distance away and are connected to each other by means of only the first web member.Preferably, described first web member adopts wire rope, is only particularly a wire rope.First web member length is adjustable, can avoid some resonance whereby.Certainly, the first web member also can be the web member of other type, and as belt, chain etc., quality is soft and shearing rigidity is becoming tight best in the rope of zero, as long as this web member can bear enough large tensile force and have very little lateral stiffness.Its advantage is, although load-on module and each self-contained error amplifying element of measurement module, but by making load-on module and measurement module avoid load-on module to the interference of measuring independently of one another, thus avoid owing to making very little moment of friction to be measured be difficult to the problem be accurately under very high radial load.Thus, the accurate measurement to relatively little moment of friction under high radial load is achieved.
In a preferred embodiment, described load-on module and described measurement module are connected to each other, and the axis of the described measurement axle of described measurement module and described first web member cutting out in described load-on module are a little positioned on a surface level.Its advantage is, ensure that the accurate loading to measured bearing thus, and the first web member this in time there is the small deflection of one end relative to the other end, there is no the moment of resistance.
In a preferred embodiment, radial load adopts gravity and the lever amplification system of counterweight.Its advantage is, obtain a constant power by simple method, this constant force is run and all can not be changed under any operating mode of measured bearing.And during measured bearing non rotating, radial force stream points to BEARING SHAFT all the time automatically.This from making radial loaded can not produce false moment to heart function.
In a preferred embodiment, one end of described measurement axle is connected with the output unit of described driver module thus is driven by described driver module, and the other end of described measurement axle is connected with measured bearing to realize measuring.Preferably, the output unit of described driver module is the first belt pulley, and the second belt pulley be fixed on described measurement axle and this first belt pulley are connected to each other by belt, particularly polywedge bet.Preferably, measurement axle and measured bearing are connected to each other by an adapter.Preferably, the head of this adapter is the right cylinder coordinated with measured bearing small―gap suture, and afterbody is a stud.Its advantage is, load-on module is separated with driver module, avoids driver module adjusts driving belt tensile force because of the change of radial load.
In a preferred embodiment, described first web member is connected on the bearing holder (housing, cover) of measured bearing.Preferably, measured bearing is connected with described bearing holder (housing, cover) by a shell, and particularly described bearing holder (housing, cover) compresses on the housing.Preferably, the calibration mass for carrying out demarcating is arranged on described bearing holder (housing, cover).Its advantage is, load-on module automatic centering.
In a preferred embodiment, described measurement module comprises non-contact displacement sensor, in order to measure the change in displacement of measured bearing outer ring, thus obtains moment of friction.Particularly current vortex sensor, described non-contact displacement sensor comprises sensor measurement sheet and sensor stator.Preferably, described sensor measurement sheet is arranged on described bearing holder (housing, cover), and described sensor stator is arranged on one for that support described measurement axle, fixing measurement bracing strut, its advantage is, non-cpntact measurement avoids to be brought into extra interference in measurement.
In a preferred embodiment, described load-on module comprises loading disc and loads axle.Preferably, described loading axle loads bracing strut supporting by one and can freely rotate.Preferably, described loading disc is fixed by a loading disc flange and is located.Preferably, the diameter of described loading disc is greater than the diameter of described loading axle.Preferably, in the side face of described loading disc, be formed with groove, the second web member is in a groove around large half-turn, and one end of this second web member cuts out from groove, and the other end is fixed in this groove, and one end cut out of this second web member loads counterweight.
In a preferred embodiment, described heating module comprises well heater particularly electric heater, pressure regulator and heat shield, wherein said well heater is arranged on for that support described measurement axle, fixing measurement bracing strut, and described heat shield covers on outside described measurement module.The adjustment not affecting other parameter when probe temperature regulates can be realized.
The present invention also proposes a kind of measuring method of bearing frictional torque.Method according to the present invention based on so-called " displacement method ", its principle based on, by measure displacement draw moment of friction.Because the method is not directly measure moment of friction, but measure the displacement caused by moment of friction, so avoid sensor itself to apply acting force to measurand, large radial load is loaded becomes possibility.In the method, when measured bearing rotates, due to radial load automatic centering principle, bearing radial force flow path is through bearing center.When load is subject to the effect of bearing frictional torque, its power flow path not after bearing center, but there occurs minor shifts relative to bearing center, and this skew is caused by bearing frictional torque completely.When test parameter is constant, side-play amount and moment of friction are directly proportional, and thus, the measurement of moment of friction is converted into the measurement of displacement.
Can use in the method according to measuring equipment of the present invention, when there is minor shifts in the case in one end of web member, there is not the resistance that can not predict or can not ignore.So by making load-on module be separated with measurement module, and make loading force and measure moment numerically mutually not interfere.The key problem in technology of this invention is that measurement module structure, operation, range, precision etc. are not all by the impact of radial load size.
Use according to measuring equipment of the present invention, the method comprises the following steps:
The first step, installs bearing to be measured;
Second step, regulates required load and temperature by controlled loading module and heating module;
3rd step, the resonance speed of searching system, to eliminate its impact;
3rd step, equipped with non-contact displacement transducer, particularly eddy current displacement sensor;
4th step, selects the range of speeds needed to carry out dynamic calibration to system, to draw the relation of displacement and moment of friction;
5th step, takes off all calibration mass, and measures.
Radial stand under load the bearing rotated with certain speed, can not leave and rock, vibrate, even resonate to avoid moment of friction dynamic change.By analog to digital conversion, adopt digital sample and filtering, the data processing method such as average obtains moment of friction.
In a preferred embodiment, described dynamic calibration carries out as follows: load and demarcate load, particularly hang up the counterweight that weight is known.The displacement corresponding to the demarcation load measurement of each loading.The result of repetitive measurement is averaged and obtains the relation of moment and displacement, as calibration result.
In a preferred embodiment, in described 5th step, control driver module to reach required measurement rotating speed, the measurement axle of measurement module is rotated forward with this measurement rotating speed be rotated in a first direction in other words and measure the first displacement a, make the measurement axle of measurement module again with the reversion of this measurement rotating speed in other words along rotating in the opposite direction with first party and measuring the second displacement b, utilize the difference of described first displacement a and the second displacement b as the twice of the displacement under measurement rotating speed, (a-b)/2 and calibration value are drawn the moment of friction of measured bearing under this rotating speed to this.
In a preferred embodiment, in described 5th step, control driver module to reach one lower than the slow-speed of revolution of measuring rotating speed, the measurement axle of measurement module is rotated forward with this measurement rotating speed be rotated in a first direction in other words and measure triple motion, make the measurement axle of measurement module again with the reversion of this measurement rotating speed in other words along rotating in the opposite direction with first party and measuring the 4th displacement, utilize described triple motion and the 4th displacement difference and by drawing the moment of friction of measured bearing under this slow-speed of revolution compared with calibration structure, then, control driver module to reach described measurement rotating speed, the measurement axle of measurement module is made to rotate forward with this measurement rotating speed and measure the first displacement, the difference of the first displacement and triple motion is obtained as increment and is measuring the displacement under rotating speed, and by drawing the moment of friction of measured bearing under this rotating speed compared with calibration structure.
Accompanying drawing explanation
Fig. 1 is bearing frictional torque measuring equipment front elevation.
Fig. 2 is bearing frictional torque measuring equipment vertical view cutaway drawing.
Fig. 3 is measurement module and driver module front elevation.
Fig. 4 is the front elevation of load-on module.
Fig. 5 is the cut-open view of load-on module along the A-A line in Fig. 2.
Fig. 6 is the cut-open view of adapter and measured bearing.
Fig. 7 is the cut-open view of measurement module along the B-B line of Fig. 2.
Embodiment
Fig. 1 illustrate according to of the present invention, for measuring the measuring equipment of the moment of friction of bearing under the condition such as different rotating speeds, temperature of radial stand under load.This measuring equipment comprises load-on module 1 for carrying out radial loaded to measured bearing, for carrying out temperature controlled heating module 3 to measured bearing and for the measurement module 4 of measuring moment of friction and for driving the driver module 2 of measurement module.Described load-on module 1, driver module 2, heating module 3 and measurement module 4 are all arranged on a stationary plane, and this stationary plane can be ground also can be a base.
Load-on module 1 and measurement module 4 are connected to each other by the first web member 23.In a preferred embodiment, this first web member is wire rope, respectively forms a closed loop at the two ends of this wire rope, described in close and be enclosed within respectively on the screw of load-on module and measurement module.
Described load-on module 1 comprises loading counterweight 32 and force loading device, and this force loading device is connected with measurement module 4 through the first web member 23.Force loading device comprises loading disc 29 and loads axle 38.Utilize a loading bracing strut 28 to support load axle 38 and can freely rotate, utilize a loading disc flange 39 fix and locate loading disc 29.Loading disc 29 diameter dimension is greater than loading axle 38 diameter, according to the loading force that equalising torque is amplified.Groove 42, second web member 31 is formed in a groove around large half-turn in the side face of loading disc 29.One end of this second web member 31 cuts out from groove, and the other end is fixed in this groove.Such loading counterweight 32 just can be hung on one end cut out of this second web member 31, and applies power along the tangential direction of loading disc 29 to it.
Described load-on module 1 also comprises for be fixed on by force loading device on stationary plane and fixing and location loads the loading axle base plate 27 of bracing strut 28.
In one embodiment, be screw Flange joint between loading disc and loading axle, load axle and be connected by bearing with loading bracing strut, brearing bore and cylindrical are all interference fit, and loading between bracing strut and base plate is that bolt connects.
Described measurement module 4 comprises to be measured base plate 6, measurement bracing strut 7 and measures axle 22.Measure in measurement module 4 in the axis of axle 22 and load-on module 1 that cutting out of first web member 23 a little must on a surface level.Measure base plate 6 and ground and measure bracing strut 7 and be connected, be such as connected by bolt.Measure bracing strut 7 to measure axle 22 for supporting, such as being supported by bearing.The one end measuring axle 22 is connected with a belt pulley 35 synchronous axial system realizing axle and wheel, and the other end is connected with measured bearing 16.This belt pulley is connected with the driving wheel of driver module by belt.This driving wheel is connected with the motor axle key of driver module.This belt is polywedge bet and is applied in pretightning force.
Measure axle 22 to be realized by an adapter 17 with the connection of measured bearing 16, the head of this adapter is the right cylinder coordinated with measured bearing 16 small―gap suture, and afterbody is a stud, and material, the size of stud will carry out Stress Check.The size of adapter 17 own can position measured bearing 16, when measured bearing 16 be fastened on adapter 17, upper thus be fastened on measure on axle 22 time, the groove 42 just in time aiming at the loading axle 38 of load-on module 1 perpendicular to face in axis of measured bearing 16.Adapter 17 reserves one section to be processed into square, can lower ejector lever, with spanner adapter 17 is tightened in measure on axle 22 time, need block with pipe wrench and measure axle 22.Adapter 17 axial centre leaves screw, and measured bearing 16 installs rear catch 44 and blocks, and screw 43 is tightly lived, and catch outer rim can only push down bearing inner race, bearing all can not be pushed down.
Measured bearing 16 is connected with bearing holder (housing, cover) 14 by shell 15, and bearing holder (housing, cover) 14 is pressed on shell 15 by screw 19.Bearing holder (housing, cover) 14 is connected with load-on module 1 by the first web member 23, thus realizes the loading of large load.Shell 15 internal diameter and measured bearing 16 external diameter interference fit, thickness is equal with measured bearing 16 thickness, and shell 15 external diameter is equal with bearing holder (housing, cover) 14 internal diameter, and thickness is equal with bearing holder (housing, cover) 14 thickness.Need with different adapters and shell to different measurement bearings.Bearing holder (housing, cover) 14 is pressed on shell 15, realizes being synchronized with the movement of bearing holder (housing, cover) 14, shell 15 and bearing outer ring.
Measurement module 4 comprises eddy current displacement sensor.Eddy current displacement sensor comprises sensor measurement sheet 12 and sensor stator 11.
Bearing holder (housing, cover) 14 is provided with sensor measurement sheet 12, and is provided with sensor stator 11 on measurement bracing strut 7.Sensor measurement sheet 12 and bearing holder (housing, cover) 14 are synchronized with the movement, and therefore the spin friction of measured bearing 16 inner ring causes the micro-corner of bearing outer ring finally can be converted into the circumferential displacement of sensor measurement sheet 12.Carrying out timing signal, bearing holder (housing, cover) 14 is provided with the calibration mass 21 hitched by filament 20, calibration mass 21 can produce a moment to rotation center, and this moment can cause the displacement of corresponding sensor measurement sheet 12, thus obtains the relation of moment and displacement.
In a preferred embodiment, measure axle and measure between bracing strut and connected by bearing, brearing bore and cylindrical are all interference fit, load between bracing strut and base plate is that bolt connects, adapter is that bolt is connected with measurement axle, adapter and measured bearing endoporus are clearance fit or interference fit, and measured bearing cylindrical is interference fit with shell.
Heating module 3 comprises tracklayer heater 13, pressure regulator 34 and heat shield 8.Tracklayer heater 13 is placed on to be measured on bracing strut 7, and heat shield 8 covers on outside measurement module 4.The rectangular parallelepiped support that heat shield 8 is welded for iron plate, but in order to adding of calibration mass 21 is unloaded operation and fallen in one piece, on heat shield 8, each stickup sheathing paper plays heat insulation effect, measurement module 4 major part only covers to heat by heat shield 8, and therefore measurement module 4 connects part all will open corresponding gap on sheathing paper to the external world.Heat-insulating bracket is that iron plate is welded, and ceramic fiber paper is bonded at heat shield periphery by glue.
In the illustrated embodiment, loading force is applied to the second web member 31 by counterweight 32, then passes to measurement module 4 through loading disc 29, loading axle 38 and the first web member 23.In this power bang path, have between loading axle 38 and measurement module 4 and only have the first web member 23 to participate in power transmission.
Below the measuring method of bearing frictional torque is described.
When using the said equipment to carry out the measurement of moment to measured bearing, first bearing to be measured being installed, adjusting required load and temperature by controlled loading module and heating module.Start the motor of driver module, make motor speed linear change and then make the rotating speed of measurement axle linear change lentamente in the required measurement range of speeds lentamente in the required measurement range of speeds, to find the rotating speed that can occur to resonate, referred to as resonance speed.In formal experiment, by controlling motor to make its rotating speed at this resonance speed place Spline smoothing, thus skip this resonance speed.
After finding resonance speed, eddy current displacement sensor is installed.
At a specific rotation speeds place, dynamic calibration is carried out to system.Wherein, rotating speed is added to the average place of the required measurement range of speeds, can not resonate herein.If oscilloscopic waveform is better, the little noise of amplitude is little, then under this rotating speed, do calibration experiment, method, for hang calibration mass on filament, is often hung a calibration mass, is adopted a sample, sample frequency will adjust according to rotating speed, ensures that each cycle can adopt 50-60 point.According to the moment of the paired rotation center of the gravity reduction of calibration mass, obtain the relation of moment and displacement in conjunction with sampling average, become calibration result.Bearing why to be allowed to rotate and to carry out dynamic calibration, instead of carry out static demarcating when bearing is static, because stationary state lower bearing has stiction, calibration mass is less, effect due to stiction makes same calibration mass lower bearing reach balance in multiple position, truly can not reflect the relation of moment and displacement.When bearing rotates, stiction becomes kinetic force of friction, solves this problem, and calibration result is reliable and stable, linearly good.
Take off all calibration mass, rotating speed is measured by required for motor speed modulation, first rotate forward, rear reversion, because bearing is axisymmetric, can think that bearing rotates forward the moment of friction produced of reversing under same condition is equal and opposite in direction, direction is contrary, therefore the displacement showing sensor measurement sheet is also equal and opposite in direction, direction is contrary, rotating is sampled separately, the displacement average obtained is subtracted each other (being namely about added value), think the displacement that 2 times of moment of frictions cause, again with calibration result contrast, obtain a moment of friction, namely be that measured bearing is in this load, this temperature, moment of friction under this rotating speed.
In some high rotating speed experiment, because rotate forward reversion to skip resonance speed always, control very inconvenient, therefore can adopt with the following method:
Under a slow-speed of revolution, first do rotating experiment ask poor, can to think relative to slow-revving increment at the high rotating speed of rotating forward and equal high rotating speed relative to slow-revving increment, therefore high rotating speed only can do and rotate forward experiment.Such as under 1000rpm, rotate forward to obtain displacement average x1, reverse to obtain displacement average x2, the displacement that 1000rpm moment of friction causes is (x1-x2)/2, rotating forward displacement average is at 3,000 rpm y1, and the displacement that 3000rpm moment of friction causes is (x1-x2)/2+ (y1-x1).
Reference numerals list
1 load-on module
2 driver modules
3 heating modules
4 measurement modules
load-on module
32 load counterweight
29 loading discs
38 load axle
31 second web members
27 load axle base plate
28 load bracing strut
39 loading disc flanges
The groove of 42 loading axles
measurement module
6 measure base plate
7 measure bracing strut
22 measure axle
35 belt pulleys
16 measured bearings
17 adapters
15 shells
14 bearing holder (housing, cover)s
23 first web members
12 sensor measurement sheets
11 sensor stators
20 filaments
21 calibration mass
35 multi-wedge belt pulleys
19 screws
heating module
13 tracklayer heaters,
34 pressure regulators
8 heat shields.

Claims (7)

1. a measuring equipment for Frictional Moment for Rolling Bearings, comprising:
For carrying out the load-on module (1) of radial loaded to measured bearing;
For carrying out temperature controlled heating module (3) to measured bearing;
For measuring the measurement module (4) of moment of friction, this measurement module comprises measurement axle, and the applying of radial load, to the measurement of moment of friction, specifically refers to the measurement of displacement herein, noiseless effect;
And for driving the driver module (2) of measurement module, wherein the accurate adjustment of change to rotating speed of the size of radial force is had no effect;
Wherein, described load-on module (1) is connected with described measurement module (4), thus applies acting force to described measurement module (4),
It is characterized in that, described measurement module (4) comprises non-contact displacement transducer, and described non-contact displacement transducer for measuring the change in displacement of measured bearing outer ring, thus obtains moment of friction,
Described non-contact displacement transducer comprises sensor measurement sheet (12) and sensor stator (11), described sensor measurement sheet (12) is arranged on described bearing holder (housing, cover) (14), and described sensor stator (11) is arranged on one for that support described measurement axle (22), fixing measurement bracing strut (7).
2. measuring equipment according to claim 1, it is characterized in that, described load-on module (1) comprises loading disc (29) and loads axle (38), described loading axle (38) loads bracing strut (28) by one and supports and can freely rotate, described loading disc (29) is fixed by a loading disc flange (39) and is located, the diameter of described loading disc (29) is greater than the diameter of described loading axle (38), groove (42) is formed in the side face of described loading disc (29), second web member (31) is in a groove around large half-turn, one end of this second web member (31) cuts out from groove, the other end is fixed in this groove, one end cut out of this second web member (31) loads counterweight (32).
3. measuring equipment according to claim 1, it is characterized in that, described heating module (3) comprises well heater (13), pressure regulator (34) and heat shield (8), wherein said well heater (13) is arranged on for that support described measurement axle (22), fixing measurement bracing strut (7), and described heat shield (8) covers on described measurement module (4) outward.
4. a measuring method for Frictional Moment for Rolling Bearings, the method comprises the following steps:
The first step, installs bearing to be measured,
Second step, regulates required load and temperature by controlled loading module and heating module,
3rd step, the resonance speed of searching system, to eliminate its impact, equipped with non-contact eddy current displacement sensor,
4th step, selects specific rotation speeds scope and carries out dynamic calibration to system, to draw the relation of displacement and moment of friction,
5th step, takes off all calibration mass, and measures.
5. measuring method according to claim 4, it is characterized in that, described dynamic calibration carries out as follows: load and demarcate load, then corresponding to the demarcation load measurement of each loading displacement, to the result of repetitive measurement be averaged obtain moment and displacement relation as calibration result.
6. measuring method according to claim 4, is characterized in that, in described 5th step, control driver module to reach required measurement rotating speed, the measurement axle of measurement module rotates forward with this measurement rotating speed and measures the first displacement a; The measurement axle of measurement module is made to reverse with this measurement rotating speed and measure the second displacement b again; Utilize the difference of described first displacement and the second displacement as the twice of the displacement under described measurement rotating speed, (a-b)/2 and calibration value are contrasted and draws the moment of friction of measured bearing under described measurement rotating speed.
7. measuring method according to claim 4, it is characterized in that, in described 5th step, control driver module to reach one lower than the slow-speed of revolution of arbitrary scheduled measurement rotating speed, make the measurement axle of measurement module rotate forward with this slow-speed of revolution and measure triple motion, then make the measurement axle of measurement module reverse with this slow-speed of revolution and measure the 4th displacement; Utilize described triple motion and the 4th displacement difference and by drawing the moment of friction of measured bearing under this slow-speed of revolution compared with calibration result; Then, control driver module to reach described scheduled measurement rotating speed, the measurement axle of measurement module is made to rotate forward with this scheduled measurement rotating speed and measure the first displacement, using the displacement that the difference of the first displacement and triple motion is obtained under scheduled measurement rotating speed as increment, and by drawing the moment of friction of measured bearing under this scheduled measurement rotating speed compared with calibration result.
CN201110430320.7A 2011-12-20 2011-12-20 Method and equipment for measuring friction torque of radially loaded bearing Active CN102539039B (en)

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