CN108254185A - Apply the rolling bearing performance experimental rig of radially alternating load based on crank connecting link - Google Patents
Apply the rolling bearing performance experimental rig of radially alternating load based on crank connecting link Download PDFInfo
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- CN108254185A CN108254185A CN201711456930.8A CN201711456930A CN108254185A CN 108254185 A CN108254185 A CN 108254185A CN 201711456930 A CN201711456930 A CN 201711456930A CN 108254185 A CN108254185 A CN 108254185A
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- fixture block
- crank
- rolling bearing
- rotary shaft
- alternating load
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The present invention relates to the rolling bearing performance experimental rigs for applying radially alternating load based on crank connecting link, device includes workbench, rotary shaft supporting mechanism, rotary shaft, driving motor and radially alternating load loading unit, the radially alternating load loading unit includes loading unit stent, fixture block component and a pair are arranged in a mutually vertical manner the crank connecting link radial loaded mechanism on loading unit stent, crank connecting link radial loaded mechanism includes the first electric rotating machine, second electric rotating machine, first crank rod assembly, first spring loads component, second crank rod assembly and second spring charging assembly.Compared with prior art, the first electric rotating machine, the second electric rotating machine can apply radially alternating load by the first spring loads component, second spring charging assembly to the rolling bearing in fixture block component respectively in the present invention, to simulate the real working condition condition of dynamic load rolling bearing in internal combustion engine, rolling bearing performance result of the test ensure that accurately and reliably.
Description
Technical field
The invention belongs to technical field of internal combustion engines, are related to applying based on crank connecting link the rolling bearing of radially alternating load
It can experimental rig.
Background technology
Internal combustion engine has been widely used in automobile, ship, aircraft, tank, railway locomotive, agriculture machine as power-equipment
Multiple industries such as tool, engineering machinery, generating set, play a very important role in national economy.Include in internal combustion engine
Piston-cylinder liner, piston ring-cylinder liner, bent axle-bearing and cam-tappet etc. are several to important friction pair, wherein, bent axle-bearing packet
It includes base bearing and the connecting-rod bearing (since the size and Orientation of such bearing working load all changes over time, is thus generically referred to as
Dynamic loading bearing), it is one of the most key friction pair of internal combustion engine, it not only influences the reliability of internal combustion engine and durable
Property, also affect the potentiality that internal combustion engine is further strengthened.
At present, car engine main bearing, camshaft bearing and connecting rod bottom-end bearing mainly use sliding bearing, and a small number of
The camshaft bearing of engine employs rolling bearing.According to tribology theory, rolling friction is than the energy loss of sliding friction
Small an order of magnitude or so is wanted, under identical working condition, the friction loss of rolling bearing is much smaller than sliding bearing, therefore,
The important trial that bearing element chemical conversion lowers consumption for engine antifriction.
The performance and its reliability of rolling bearing are the most important performance indicators of rolling bearing, but due to influencing bearing performance
Factor it is too many, carry out rolling bearing performance experiment be a kind of effective way.Bearing test is in design bearing and manufacturing process
Essential and basic important verification process, wherein, the important parameter that the loading load of test bearing is tested as bearing tester,
Accuracy directly affects the result of bearing test.Rolling bearing experimental rig loading characteristic traditional at present is single, it is impossible to carry out
The loading of changeable load, and dynamic load rolling bearing often works, therefore traditional rolling in alternating load in true internal combustion engine
Bearing performance experimental rig can not carry out the experiment of internal combustion engine dynamic load rolling bearing.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is based on crank connecting link
Apply the rolling bearing performance experimental rig of radially alternating load.
The purpose of the present invention can be achieved through the following technical solutions：
Apply the rolling bearing performance experimental rig of radially alternating load based on crank connecting link, rolling bearing is included in bearing
The bearing outer ring that enclose, is set in outside bearing inner race, the retainer being arranged between bearing outer ring and bearing inner race and multiple
Along the uniformly distributed rolling element on retainer of the circumferential direction of bearing inner race, the device includes workbench, is arranged on workbench
On rotary shaft supporting mechanism, in the horizontal direction through rotary shaft supporting mechanism rotary shaft, setting on the table and with rotation
The radially alternating load that the driving motor and setting that one end of shaft is sequentially connected are adapted on the table and with rotary shaft
Loading unit, the radially alternating load loading unit include that setting loading unit stent on the table, to be arranged on loading single
On first stent and the fixture block component and a pair that are set in outside rotary shaft be arranged in a mutually vertical manner on loading unit stent and with
The crank connecting link radial loaded mechanism that fixture block component is adapted, the crank connecting link radial loaded mechanism include being arranged on loading
It is passed on unit rack and respectively positioned at the first electric rotating machine of fixture block component both sides and the second electric rotating machine, with the first electric rotating machine
First crank rod assembly of dynamic connection, the first spring loads group being arranged between the first crank rod assembly and fixture block component
The second crank rod assembly and be arranged on the second crank rod assembly and fixture block group that part and the second electric rotating machine are sequentially connected
Second spring charging assembly between part；First crank rod assembly is set in the defeated of the first electric rotating machine including one end
The first crank on shaft is arranged on the first connecting rod of the first crank other end, is arranged on the first piston of first connecting rod one end
And the first guide cylinder for being arranged on loading unit stent and being adapted with first piston；Second crank rod assembly
The second crank for being set in including one end on the output shaft of the second electric rotating machine is arranged on the second of the second crank other end and connects
Bar, the second piston for being arranged on second connecting rod one end and be arranged on loading unit stent and be adapted with second piston
Two guide cylinders.In crank connecting link radial loaded mechanism, the first electric rotating machine drives the rotation of the first crank, and then drives first connecting rod
Movement, under the guiding role of the first guide cylinder, first piston moves back and forth；Second electric rotating machine drives the rotation of the second crank,
And then second connecting rod movement is driven, under the guiding role of the second guide cylinder, second piston moves back and forth.By rolling to be tested
Bearing is placed between fixture block component, and is arranged on the rotary shaft；Driving motor drives rotary shaft rotation, and two crank connecting links radially add
The first electric rotating machine, the second electric rotating machine in mounted mechanism drive the first spring loads by first piston, second piston respectively
Component, second spring charging assembly apply fixture block component active force from four direction, and then realize and rolling bearing is radially handed over
The application of varying load.
In rolling bearing, rolling element is evenly distributed in bearing inner race and bearing by retainer along the circumferential direction of bearing inner race
Between outer ring.
As preferred technical solution, the end face of the fixture block component is square, two first spring loads components, two
Two spring loads components are located at the surrounding of fixture block component respectively.
Further, the rotary shaft supporting mechanism includes being set up in parallel the first support component on the table, the
Two support components, the rotary shaft run through the first support component and the second support component in the horizontal direction.First support component
And second support component rotary shaft can be supported.
Further, first support component includes setting first bearing seat on the table and is arranged on the
On one bearing block and the first auxiliary bearing for being set in outside rotary shaft, second support component include being arranged on workbench
On second bearing seat and be arranged in second bearing seat and be set in the second auxiliary bearing outside rotary shaft.First auxiliary
Bearing and the second auxiliary bearing are arranged on the rotary shaft side by side, and rotary shaft is supported.
Further, first auxiliary bearing and the second auxiliary bearing are rolling bearing.
Further, the fixture block component includes the first fixture block and the second fixture block that are oppositely arranged, the described first folder
Rolling bearing installation cavity is equipped between block and the second fixture block.During experiment, rolling bearing to be tested is placed in the first fixture block and
Between two fixture blocks.
Further, temperature sensor is equipped in first fixture block.
Further, the first spring loads component includes be arranged between first piston and fixture block component first
First piston link block between spring, the one end for being arranged on the first spring and first piston and it is arranged on the another of the first spring
The first fixture block link block between one end and fixture block component；The second spring charging assembly include be arranged on second piston with
Second spring between fixture block component, the second piston link block being arranged between one end of second spring and second piston and
The second fixture block link block being arranged between the other end of second spring and fixture block component.First electric rotating machine drives first piston
It moves back and forth, and then makes the first spring that stretching or compressive deformation occur, and pass through fixture block component and applied to rolling bearing to be tested
Add loading force；Second electric rotating machine drives second piston to move back and forth, and then makes second spring that stretching or compressive deformation occur, and
Loading force is applied to rolling bearing to be tested by fixture block component.
Further, shaft coupling is equipped between the driving motor and rotary shaft, and passes through shaft coupling and rotary shaft
One end is sequentially connected.Driving motor is connected by shaft coupling with rotary shaft, and rotary shaft is driven to rotate.
Further, the workbench is equipped with the torquemeter being adapted with rotary shaft.
Further, the device further includes computer.Computer respectively with driving motor, the first electric rotating machine and
Two electric rotating machines are electrically connected, to control corresponding component.Computer control driving motor rotation, makes the axis of rolling to be tested
Holding can be with scheduled rotary speed working.In addition, torquemeter and temperature sensor can acquire the axis of rolling also with calculating mechatronics
The signal in operation process is held, monitors the operational situation of rolling bearing.
As preferred technical solution, the device further includes oil supply system.Oil supply system is with calculating mechatronics, meter
Calculation machine control oil supply system realizes the fuel feeding of rolling bearing.
As preferred technical solution, the oil supply system include fuel tank, constant displacement pump, filter, pressure sensor and
Flowmeter.The oil-feed port of fuel tank is sequentially connected constant displacement pump, filter by oil feed line, and pressure sensor and flowmeter are arranged on
On oil feed line, fuel tank is rolling bearing fuel feeding by oil feed line.
The present invention is in practical application, rolling bearing to be tested is placed between the first fixture block and the second fixture block, and is covered
If on the rotary shaft；Computer control driving motor rotation, makes rolling bearing with scheduled rotation speed operation；It is controlled by computer
The rotation angle of the first electric rotating machine and the second electric rotating machine in two crank connecting link radial loaded mechanisms, and then control two first
The stretching/compressing amount of spring and two second springs, due to the change of the first spring and the stretching/compressing amount of second spring, first
Spring and second spring apply of different sizes, direction-agile active force, and then realize rolling bearing diameter in fixture block assembly surface
Application to alternating load.Meanwhile computer controls the oil mass in rolling bearing operation process to supply by oil supply system, torque
Instrument and temperature sensor can detect the performance in rolling bearing operation process.
Wherein, multiple rolling bearings can be placed between the first fixture block and the second fixture block simultaneously, are realized to multiple rolling bearings
While test.
Compared with prior art, the invention has the characteristics that：
1) the first electric rotating machine, the second electric rotating machine can be loaded by the first spring loads component, second spring respectively
Component applies radially alternating load to the rolling bearing in fixture block component, to simulate the true work of dynamic load rolling bearing in internal combustion engine
Condition condition ensure that rolling bearing performance result of the test accurately and reliably；
2) rotation angle and time variation amount of the first electric rotating machine, the second electric rotating machine are controlled by computer, by the
One electric rotating machine, the second electric rotating machine convert rotational motion for first piston, second piston linear motion, to change first
The amount of tension or decrement of spring, second spring, and then the elastic force of the first spring of control, second spring, realize rolling bearing diameter
Application to alternating load.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention；
Fig. 2 is the structure diagram of radial direction alternating load loading unit in the present invention；
Description of symbols in figure：
1-computer, 2-driving motor, 3-shaft coupling, 4-torquemeter, 5-first bearing seat, 6-oil supply system,
7-radially alternating load loading unit, the 8-the first fixture block, 9-second bearing seat, 10-rotary shaft, the 11-the second asessory shaft
Hold, 12-rolling bearing, the 13-the second fixture block, the 14-the first auxiliary bearing, 15-workbench, 16-temperature sensor, 17-
First electric rotating machine, 18-first piston link block, the 19-the first spring, the 20-the first fixture block link block, the 21-the second fixture block
Link block, 22-second spring, 23-second piston link block, the 24-the second electric rotating machine, the 25-the first crank, 26-the first
Connecting rod, 27-first piston, the 28-the first guide cylinder, the 29-the second crank, 30-second connecting rod, 31-second piston, 32-
Second guide cylinder.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment：
The rolling bearing performance experimental rig for applying radially alternating load based on crank connecting link as shown in Figure 1, the axis of rolling
12 are held to include bearing inner race, the bearing outer ring being set in outside bearing inner race, be arranged between bearing outer ring and bearing inner race
Retainer and the uniformly distributed rolling element on retainer of multiple circumferential directions along bearing inner race, device include workbench 15, set
The rotary shaft supporting mechanism on workbench 15 is put, runs through the rotary shaft 10 of rotary shaft supporting mechanism in the horizontal direction, be arranged on
It the driving motor 2 that is sequentially connected on workbench 15 and with one end of rotary shaft 10 and is arranged on workbench 15 and and rotary shaft
The 10 radially alternating load loading units 7 being adapted, as shown in Fig. 2, the radially alternating load loading unit 7 includes being arranged on work
Make the loading unit stent on platform 15, the fixture block component for being arranged on loading unit stent and being set in outside rotary shaft 10 and
The crank connecting link radial loaded mechanism that a pair is arranged in a mutually vertical manner on loading unit stent and is adapted with fixture block component, crank
Connecting rod radial loaded mechanism includes being arranged on loading unit stent and is located at the first electric rotating machine of fixture block component both sides respectively
17 and second electric rotating machine 24, be sequentially connected with the first electric rotating machine 17 the first crank rod assembly, be arranged on the first crank
The first spring loads component between link assembly and fixture block component, the second crank company with the drive connection of the second electric rotating machine 24
Bar assembly and the second spring charging assembly being arranged between the second crank rod assembly and fixture block component；First crank connecting link
Component include one end be set on the output shaft of the first electric rotating machine 17 the first crank 25, be arranged on 25 other end of the first crank
First connecting rod 26, be arranged on the first piston 27 of 26 one end of first connecting rod and be arranged on loading unit stent and with first
The first guide cylinder 28 that piston 27 is adapted；Second crank rod assembly includes the output that one end is set in the second electric rotating machine 24
The second crank 29 on axis, is arranged on the of 30 one end of second connecting rod at the second connecting rod 30 for being arranged on 29 other end of the second crank
Two pistons 31 and the second guide cylinder 32 for being arranged on loading unit stent and being adapted with second piston 31.
Wherein, rotary shaft supporting mechanism includes the first support component, the second support group that are disposed in parallel on workbench 15
Part, rotary shaft 10 run through the first support component and the second support component in the horizontal direction.First support component includes being arranged on work
Make the first bearing seat 5 on platform 15 and be arranged in first bearing seat 5 and be set in the first asessory shaft outside rotary shaft 10
14 are held, the second support component includes the second bearing seat 9 being arranged on workbench 15 and is arranged in second bearing seat 9 and covers
The second auxiliary bearing 11 being located at outside rotary shaft 10.First auxiliary bearing 14 and the second auxiliary bearing 11 are rolling bearing.
Fixture block component includes the first fixture block 8 and the second fixture block 13 that are oppositely arranged, between the first fixture block 8 and the second fixture block 13
Equipped with rolling bearing installation cavity.Temperature sensor 16 is equipped in first fixture block 8.
First spring loads component includes the first spring 19 being arranged between first piston 27 and fixture block component, is arranged on
First piston link block 18 between one end of first spring 19 and first piston 27 and it is arranged on the another of the first spring 19
The first fixture block link block 20 between end and fixture block component；Second spring charging assembly includes being arranged on second piston 31 and fixture block
Second piston link block 23 between second spring 22 between component, the one end for being arranged on second spring 22 and second piston 31
And it is arranged on the second fixture block link block 21 between the other end of second spring 22 and fixture block component.
Shaft coupling 3 is equipped between driving motor 2 and rotary shaft 10, and passes through shaft coupling 3 and one end transmission of rotary shaft 10
Connection.Workbench 15 is equipped with the torquemeter 4 being adapted with rotary shaft 10.
Device further includes computer 1 and oil supply system 6.
In practical application, 2 rolling bearings 12 to be tested are placed between the first fixture block 8 and the second fixture block 13, and
It is set in rotary shaft 10；Computer 1 controls driving motor 2 to rotate, and makes rolling bearing 12 with scheduled rotation speed operation；Pass through meter
Calculation machine 1 controls the rotation angle of the first electric rotating machine 17 and the second electric rotating machine 24 in two crank connecting link radial loaded mechanisms,
And then the stretching/compressing amount of two first springs 19 and two second springs 22 is controlled, due to the first spring 19 and second spring 22
The change of stretching/compressing amount, the first spring 19 and second spring 22 apply of different sizes, direction-agile in fixture block assembly surface
Active force, and then realize the application of 12 radially alternating load of rolling bearing.Meanwhile computer 1 is controlled by oil supply system 6 and rolled
Oil mass supply in 12 operation process of bearing, torquemeter 4 and temperature sensor 16 can be detected in 12 operation process of rolling bearing
Performance.
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously can easily make these embodiments various modifications, and described herein general
Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to above-described embodiment, abilities
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be the present invention's
Within protection domain.
Claims (10)
1. applying the rolling bearing performance experimental rig of radially alternating load based on crank connecting link, rolling bearing (12) is including bearing
Inner ring, the bearing outer ring being set in outside bearing inner race, the retainer being arranged between bearing outer ring and bearing inner race and more
The uniformly distributed rolling element on retainer of a circumferential direction along bearing inner race, which is characterized in that the device includes workbench
(15), rotary shaft supporting mechanism on workbench (15), the rotary shaft for running through rotary shaft supporting mechanism in the horizontal direction are arranged on
(10), the driving motor (2) that is arranged on workbench (15) and is sequentially connected with one end of rotary shaft (10) and it is arranged on work
Make the radially alternating load loading unit (7) being adapted on platform (15) and with rotary shaft (10), the radially alternating load loading is single
First (7) including be arranged on workbench (15) loading unit stent, be arranged on loading unit stent and be set in rotary shaft
(10) external fixture block component and a pair of song for being arranged in a mutually vertical manner on loading unit stent and being adapted with fixture block component
Handle connecting rod radial loaded mechanism, the crank connecting link radial loaded mechanism includes being arranged on loading unit stent and difference position
The first electric rotating machine (17) and the second electric rotating machine (24) and the first electric rotating machine (17) in fixture block component both sides are sequentially connected
The first crank rod assembly, be arranged between the first crank rod assembly and fixture block component the first spring loads component, with
The second crank rod assembly and be arranged on the second crank rod assembly and fixture block group that second electric rotating machine (24) is sequentially connected
Second spring charging assembly between part；
First crank rod assembly includes the first crank that one end is set on the output shaft of the first electric rotating machine (17)
(25), it is arranged on the first connecting rod (26) of the first crank (25) other end, is arranged on the first piston of first connecting rod (26) one end
(27) and the first guide cylinder (28) for being arranged on loading unit stent and being adapted with first piston (27)；
Second crank rod assembly includes the second crank that one end is set on the output shaft of the second electric rotating machine (24)
(29), it is arranged on the second connecting rod (30) of the second crank (29) other end, is arranged on the second piston of second connecting rod (30) one end
(31) and the second guide cylinder (32) for being arranged on loading unit stent and being adapted with second piston (31).
2. the rolling bearing performance experimental rig according to claim 1 for applying radially alternating load based on crank connecting link,
It is characterized in that, the rotary shaft supporting mechanism includes the first support component being disposed in parallel on workbench (15), second
Support component, the rotary shaft (10) run through the first support component and the second support component in the horizontal direction.
3. the rolling bearing performance experimental rig according to claim 2 for applying radially alternating load based on crank connecting link,
It is characterized in that, first support component includes the first bearing seat (5) being arranged on workbench (15) and is arranged on
In first bearing seat (5) and it is set in external the first auxiliary bearing (14) of rotary shaft (10), the second support component packet
It includes the second bearing seat (9) being arranged on workbench (15) and is arranged in second bearing seat (9) and is set in rotary shaft
(10) external the second auxiliary bearing (11).
4. the rolling bearing performance experimental rig according to claim 3 for applying radially alternating load based on crank connecting link,
It is characterized in that, first auxiliary bearing (14) and the second auxiliary bearing (11) is rolling bearing.
5. the rolling bearing performance experimental rig according to claim 1 for applying radially alternating load based on crank connecting link,
It is characterized in that, the fixture block component includes the first fixture block (8) being oppositely arranged and the second fixture block (13), the described first folder
Rolling bearing installation cavity is equipped between block (8) and the second fixture block (13).
6. the rolling bearing performance experimental rig according to claim 5 for applying radially alternating load based on crank connecting link,
It is characterized in that, temperature sensor (16) is equipped in first fixture block (8).
7. the rolling bearing performance experimental rig according to claim 1 for applying radially alternating load based on crank connecting link,
It is characterized in that, the first spring loads component includes the first bullet being arranged between first piston (27) and fixture block component
First piston link block (18) and setting between spring (19), the one end for being arranged on the first spring (19) and first piston (27)
The first fixture block link block (20) between the other end of the first spring (19) and fixture block component；
The second spring charging assembly include being arranged on second spring (22) between second piston (31) and fixture block component,
The second piston link block (23) that is arranged between one end of second spring (22) and second piston (31) and it is arranged on second
The second fixture block link block (21) between the other end of spring (22) and fixture block component.
8. the rolling bearing performance experimental rig according to claim 1 for applying radially alternating load based on crank connecting link,
It is characterized in that, being equipped with shaft coupling (3) between the driving motor (2) and rotary shaft (10), and pass through shaft coupling (3) and rotation
One end of shaft (10) is sequentially connected.
9. the rolling bearing performance experimental rig according to claim 1 for applying radially alternating load based on crank connecting link,
It is characterized in that, the workbench (15) is equipped with the torquemeter (4) being adapted with rotary shaft (10).
10. the rolling bearing performance experimental rig according to claim 1 for applying radially alternating load based on crank connecting link,
It is characterized in that, the device further includes computer (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711456930.8A CN108254185A (en) | 2017-12-28 | 2017-12-28 | Apply the rolling bearing performance experimental rig of radially alternating load based on crank connecting link |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711456930.8A CN108254185A (en) | 2017-12-28 | 2017-12-28 | Apply the rolling bearing performance experimental rig of radially alternating load based on crank connecting link |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108254185A true CN108254185A (en) | 2018-07-06 |
Family
ID=62724217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711456930.8A Withdrawn CN108254185A (en) | 2017-12-28 | 2017-12-28 | Apply the rolling bearing performance experimental rig of radially alternating load based on crank connecting link |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108254185A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113310718A (en) * | 2021-05-26 | 2021-08-27 | 重庆市特种设备检测研究院 | Loading device and method for simulating actual working condition of elevator traction machine |
| CN114964774A (en) * | 2022-05-19 | 2022-08-30 | 青岛理工大学 | Thrust bearing testing machine |
-
2017
- 2017-12-28 CN CN201711456930.8A patent/CN108254185A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113310718A (en) * | 2021-05-26 | 2021-08-27 | 重庆市特种设备检测研究院 | Loading device and method for simulating actual working condition of elevator traction machine |
| CN113310718B (en) * | 2021-05-26 | 2023-03-24 | 重庆市特种设备检测研究院 | Loading device and method for simulating actual working conditions of elevator traction machine |
| CN114964774A (en) * | 2022-05-19 | 2022-08-30 | 青岛理工大学 | Thrust bearing testing machine |
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Application publication date: 20180706 |