CN109187019A - Oscillating oil cylinder loaded type main rotor ball socket bearing comprehensive test machine - Google Patents
Oscillating oil cylinder loaded type main rotor ball socket bearing comprehensive test machine Download PDFInfo
- Publication number
- CN109187019A CN109187019A CN201811282484.8A CN201811282484A CN109187019A CN 109187019 A CN109187019 A CN 109187019A CN 201811282484 A CN201811282484 A CN 201811282484A CN 109187019 A CN109187019 A CN 109187019A
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- main rotor
- swing rod
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- 238000012360 testing method Methods 0.000 title claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 230000007935 neutral effect Effects 0.000 claims abstract 4
- 239000003638 chemical reducing agent Substances 0.000 claims abstract 3
- 239000003921 oil Substances 0.000 claims description 86
- 239000010720 hydraulic oil Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000002828 fuel tank Substances 0.000 description 12
- 239000000306 component Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Support Of The Bearing (AREA)
Abstract
本发明公开一种摆动油缸加载式主旋翼球铰轴承综合试验机，涉及直升机主旋翼系统轴承试验技术领域，包括支承框架、传动主轴、大圆锥齿轮、小圆锥齿轮、驱动轴、主减速器、驱动电机、液压旋转接头外壳、叶片式摆动油缸、液压阀站、旋翼平台、自动倾斜器旋转环、不旋转环、大球铰轴承、双列薄壁轴承、变距拉杆、扭力臂、防扭臂、助力油缸、油缸摆杆、中立柱、连接座、铰链等构件。本发明加载过程与直升机主旋翼系统的载荷同相位、同频率，能真实模拟直升机主旋翼系统的载荷状态，能实现交变载荷、脉动载荷和恒定载荷的加载，保证主旋翼系统各类轴承服役寿命的确定更精确、更客观。
The invention discloses a comprehensive testing machine for a main rotor ball hinge bearing loaded by a swing oil cylinder, which relates to the technical field of bearing testing of a helicopter main rotor system, and comprises a support frame, a transmission main shaft, a large bevel gear, a small bevel gear, a drive shaft, a main reducer, Drive motor, hydraulic rotary joint housing, vane swing cylinder, hydraulic valve station, rotor platform, automatic tilter rotating ring, non-rotating ring, large spherical hinge bearing, double row thin-wall bearing, variable pitch rod, torsion arm, anti-twist Arm, booster cylinder, cylinder swing rod, neutral column, connecting seat, hinge and other components. The loading process of the invention is in the same phase and frequency as the load of the main rotor system of the helicopter, which can truly simulate the load state of the main rotor system of the helicopter, realize the loading of alternating loads, pulsating loads and constant loads, and ensure the service of various types of bearings of the main rotor system. The determination of lifespan is more precise and objective.
Description
Technical field
The present invention relates to Helicopter Main rotor system bearing test technical fields, load more particularly to a kind of oscillating oil cylinder
Formula main rotor ball socket bearing comprehensive test machine.
Background technique
For helicopter in flight course, the failure of any composition component can all cause catastrophic effect.Therefore to helicopter
The determination for forming component service life is a very serious and important job.In order to accurately determine that helicopter forms component
Service life, it is common practice that the fatigue test under the conditions of simulation real working condition is carried out to helicopter composition component, then logical
The fatigue life that overtesting acquires is divided by the service life that a safety coefficient is that aviation aircraft forms component.
Helicopter Main rotor system is one of core component of helicopter, the connection between each movable part of main rotor system
It is to be realized by each class bearing (ball socket bearing, hard alloy sleeve bearing and rolling bearing etc.).Previous main rotor system is each
The experiment of bearing service life is all made of single bearing and carries out on fatigue tester.The disadvantage is that: it is straight to be 1. difficult to accurate simulation
Rise the true working condition of the various bearings of owner's rotor system；2. which class or which bearing be difficult in accurate judgement main rotor system
For weakest link, the longevity of determining for leading to Helicopter Main rotor system bearing, there are large errors.Due to safety concerns, it will generally lead
Fixed relatively low of the service life of rotor system bearing, causes the waste in bearing use, while increasing maintenance cost.
Therefore, developing the Helicopter Main rotor system bearings synthesis experimental machine that forms a complete set of is very important.
Summary of the invention
The object of the present invention is to provide a kind of oscillating oil cylinder loaded type main rotor ball socket bearing comprehensive test machines, on solving
Problem of the existing technology is stated, the real working condition condition of energy each class bearing of accurate simulation Helicopter Main rotor system can guarantee
The determination of each class bearing service life of main rotor system is more accurate, more objective.
To achieve the above object, the present invention provides following schemes: the present invention provides a kind of main rotation of oscillating oil cylinder loaded type
Wing ball socket bearing comprehensive test machine, including scaffold, transmission main shaft, driving motor, hydraulic rotary joint shell, vane type pendulum
Dynamic oil cylinder, hydraulic station, rotor platform and auto-bank unit；The scaffold fixes on the ground, on the scaffold
The transmission main shaft is supported in medium pore in the middle part of platform, the driving motor is for driving the transmission main shaft to rotate；Institute
The lower end for stating transmission main shaft connects firmly the rotor platform, and the vane type oscillating oil cylinder is connected to the side of the rotor platform,
The rotary shaft of the vane type oscillating oil cylinder and the rotary shaft of rotor platform are at plumbness；
The output shaft of the vane type oscillating oil cylinder is connect with one end of an oil cylinder swing rod, the oil cylinder swing rod it is another
End connect by the 7th hinge with one end of a pitch-change-link, the other end of the pitch-change-link by the 6th hinge with it is described certainly
Dynamic inclinator is connected；The lower part of the rotor platform is connected with toggle swing rod I, the toggle swing rod I by the 8th hinge
Toggle swing rod II is also connected with by the 9th hinge, the toggle swing rod II passes through the tenth hinge and the auto-bank unit
It is connected；Central post, the central post and the auto-bank unit clearance fit are fixed on the scaffold；
The lower section of the auto-bank unit also passes through first axle and is connected with anti-torque arm swing rod I, and the anti-torque arm swing rod I is logical
It crosses second hinge and connects anti-torque arm swing rod II, the anti-torque arm swing rod II is connected by third hinge with the scaffold；Institute
It states and is also fixedly connected with attachment base below auto-bank unit, the attachment base passes through the piston rod phase of the 5th hinge and a power-assisted oil cylinder
Even, the cylinder body of the power-assisted oil cylinder is connected by the 4th hinge with the scaffold；
The top seal of the transmission main shaft is connected with a hydraulic rotary joint shell, the transmission main shaft with it is described hydraulic
Rotary joint shell is rotatably assorted, and the hydraulic rotary joint shell is solid by hydraulic rotary joint fixed frame and scaffold
Even；The hydraulic station is joined by the internal hydraulic pressure oil channel of third high-pressure hose, the 4th high-pressure hose and the transmission main shaft
Internal hydraulic pressure oil logical, that the vane type oscillating oil cylinder passes through the first high-pressure hose, the second high-pressure hose and the transmission main shaft
Channel connection.
Preferably, pass through the first double-row bearing and the second double-row bearing in the medium pore in the middle part of the scaffold upper mounting plate
Support the transmission main shaft.
Preferably, a large conical gear is connected firmly on the transmission main shaft, the driving motor is connected firmly with a main reducing gear,
A drive shaft is fixedly connected on the output shaft of the main reducing gear, the drive shaft passes through third double-row bearing and the scaffold
Connection, the end of the drive shaft is fixed with the small conical gear engaged with the large conical gear.
Preferably, the pitch-change-link is constituted by two sections, and two sections of pitch-change-links are connected by a pull pressure sensor
Together.
Preferably, the auto-bank unit includes rotating ring, the not rotating ring, big ball socket bearing that ecto-entad is set gradually
Outer ring and big ball socket bearing inner ring, the big ball socket bearing inner ring and the central post clearance fit, outside the big ball socket bearing
Ring is located at the outside of the big ball socket bearing inner ring, and the not rotating ring is connected firmly with the big ball socket bearing outer ring, the rotation
Ring is connect by biserial thin-wall bearing with the not rotating ring.
Preferably, the pitch-change-link is connected by the 6th hinge with the rotating ring, the toggle swing rod II
It is connected by the tenth hinge with the rotating ring；The anti-torque arm swing rod I is not rotated by the first axle with described
Ring is connected, and the attachment base is connected firmly with the not rotating ring.
Preferably, the first axle, second hinge, third hinge, the 8th hinge, the 9th hinge and the tenth hinge are
Column hinge.
Preferably, the 4th hinge, the 5th hinge, the 6th hinge and the 7th hinge are flexural pivot.
Preferably, the hydraulic station includes fuel tank, and the fuel tank is connected by the first oil pipe and the third high-pressure hose
Logical, the fuel tank is connected to by the second oil pipe with the 4th high-pressure hose.
Preferably, the junction of first oil pipe and the third high-pressure hose has been arranged in parallel the first servo valve and the
The junction of one check valve, second oil pipe and the 4th high-pressure hose has been arranged in parallel the second servo valve and second unidirectionally
Valve.
The present invention achieves following technical effect compared with the existing technology:
1) the load same-phase of the loading procedure of the invention and Helicopter Main rotor system, same frequency, energy real simulation are straight
Rise the loaded-up condition of owner's rotor system；
2) it is able to achieve the load of alternating load, pulsating load and permanent load.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is oscillating oil cylinder loaded type main rotor ball socket bearing comprehensive test machine schematic diagram of the present invention；
Fig. 2 is hydraulic station schematic illustration of the present invention；
Fig. 3 is vane type oscillating oil cylinder operation principle schematic diagram of the present invention；
Wherein, 1. first axle, 2. second hinges, 3. anti-torque arm swing rod II, 4. third hinges, 5. anti-torque arm swing rod I, 6.
Central post, 7. scaffolds, 8. big ball socket bearing inner ring, 9. big ball socket bearing outer rings, 10. the 4th hinges, 11. power-assisted oil cylinders,
12. the 5th hinge, 13. attachment bases, 14. the 6th hinges, 15. pitch-change-links, 16. oil cylinder swing rods, 17. the 7th hinges, 18. blades
Formula oscillating oil cylinder, 19. stators, 20. blades, 21. first high-pressure hoses, 22. small conical gears, 23. drive shafts, 24. driving electricity
Machine, 25. main reducing gears, 26. first double-row bearings, 27. hydraulic stations, 28. third high-pressure hoses, 29. the 4th high-pressure hoses,
30. hydraulic rotary joint shell, 31. hydraulic rotary joint fixed frames, 32. second double-row bearings, 33. large conical gears, 34.
Three double-row bearings, 35. second high-pressure hoses, 36. transmission main shafts, 37. rotor platforms, 38. the 8th hinges, 39. toggle swing rods
I, 40. the 9th hinges, 41. toggle swing rod II, 42. the tenth hinges, 43. rotating rings, 44. biserial thin-wall bearings, 45. do not rotate
Ring, 46. blocks, 47. pull pressure sensor, 48. hydraulic fluid ports, 49. first check valves, 50. first servo valves, 51. first oil pipes,
52. fuel tank, 53. second oil pipes, 54. second servo valves, 55. second one-way valves, 52. fuel tanks.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of oscillating oil cylinder loaded type main rotor ball socket bearing comprehensive test machines, on solving
Problem of the existing technology is stated, the real working condition condition of energy each class bearing of accurate simulation Helicopter Main rotor system can guarantee
The determination of each class bearing service life of main rotor system is more accurate, more objective.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Embodiment
As shown in Figure 1, the present embodiment provides a kind of oscillating oil cylinder loaded type main rotor ball socket bearing comprehensive test machines, including
Scaffold, transmission main shaft, driving motor, hydraulic rotary joint shell, vane type oscillating oil cylinder, hydraulic station, rotor platform
And auto-bank unit；Scaffold 7 fixes on the ground, and central emptying aperture is provided in the middle part of the platform on scaffold 7, center
Transmission main shaft 36 is supported by the first double-row bearing of a pair 32 setting up and down and a pair of second double-row bearing 34 in hole.Driving electricity
Machine is for driving transmission main shaft to rotate, specifically, a large conical gear 33 is connected firmly on transmission main shaft 36, with large conical gear 33
The small conical gear 22 of Vertical Meshing is fixed in drive shaft 23, and drive shaft 23 and the output shaft of main reducing gear 25 connect firmly, driving
Motor 24 is connected firmly with main reducing gear 25, and driving motor 24 passes through main reducing gear 25, drive shaft 23, small conical gear 22, big circular cone
Gear 33 drives transmission main shaft 36 to rotate, and 36 lower end of transmission main shaft connects firmly rotor platform 37.
Vane type oscillating oil cylinder 18 is connected to the side of rotor platform 37, the rotary shaft and rotor of vane type oscillating oil cylinder 18
For the rotary shaft of platform 37 in space at plumbness, one end of oil cylinder swing rod 16 is connected in the output shaft of vane type oscillating oil cylinder 18
On, the other end of oil cylinder swing rod 16 is connected by the 7th hinge 17 with one end of pitch-change-link 15, the other end of pitch-change-link 15
It is connected by the 6th hinge 14 with the rotating ring 43 of auto-bank unit；Wherein pitch-change-link 15 is constituted by two sections, and two sections of displacements are drawn
Bar is fixed together by a pull pressure sensor 47.Pass through the 8th hinge 38 and toggle swing rod in the lower part of rotor platform 37
I39 is connected, and is connected between toggle swing rod I39 and toggle swing rod II41 by the 9th hinge 40, and toggle swing rod II41 is logical
The tenth hinge 42 is crossed to be connected with the rotating ring 43 of auto-bank unit.
It is linked together, is not revolved by biserial thin-wall bearing 44 between the rotating ring 43 of auto-bank unit and not rotating ring 45
Change 45 is connected firmly with big ball socket bearing outer ring 9, and big ball socket bearing inner ring 8 and central post 6 are clearance fit, and central post 6 is fixed on
On scaffold 7.
Anti- torque arm swing rod I5 is connected by first axle 1 with the not rotating ring 45 of auto-bank unit, anti-torque arm swing rod I5 and
Anti- torque arm swing rod II3 is connected by second hinge 2, and anti-torque arm swing rod II3 is connected by third hinge 4 with scaffold 7.Connection
Seat 13 and the lower section of auto-bank unit not rotating ring 45 connect firmly, the piston that attachment base 13 passes through the 5th hinge 12 and power-assisted oil cylinder 11
Bar is connected, and the cylinder body of power-assisted oil cylinder 11 is connected by the 4th hinge 10 with scaffold 7, the top of transmission main shaft 36 and a liquid
Pressure rotary joint shell 30 constitutes being rotatably assorted with sealing, and hydraulic rotary joint shell 30 passes through hydraulic rotary joint fixed frame
31 are connected with scaffold 7.
Hydraulic station 27 passes through third high-pressure hose 28, the 4th high-pressure hose 29, hydraulic rotary joint shell 30 and transmission
The internal hydraulic pressure oil channel connection of main shaft 36, vane type oscillating oil cylinder 18 pass through the first high-pressure hose 21, the second high-pressure hose 35
With the internal hydraulic pressure oil channel connection of transmission main shaft 36.
First axle 1, second hinge 2, third hinge 4, the 8th hinge 38, the 9th hinge 40 and the tenth hinge in the present embodiment
Chain 42 is column hinge, i.e., connected two component can only around hinge axis relatively rotate, and cannot have the opposite fortune of other forms
It is dynamic；These columns hinge is subject bearing.4th hinge 10, the 5th hinge 12, the 6th hinge 14 and the 7th hinge 17 are flexural pivot,
It can relatively rotate, but cannot be relatively moved around three change in coordinate axis direction between i.e. connected two component, these flexural pivots are subject
Bearing.
As shown in Fig. 2, hydraulic station 27 includes fuel tank 52 in the present embodiment, fuel tank passes through the first oil pipe 51 and third high pressure
Hose 28 is connected to, and fuel tank is connected to by the second oil pipe 53 with the 4th high-pressure hose 29.First oil pipe 51 and third high-pressure hose 28
Junction be arranged in parallel the first servo valve 50 and the first check valve 49, the connection of the second oil pipe 53 and the 4th high-pressure hose 29
Place has been arranged in parallel the second servo valve 54 and second one-way valve 55.
The course of work of the invention is as follows: driving motor 24 by main reducing gear 25, drive shaft 23, small conical gear 22,
Large conical gear 33, transmission main shaft 36 drive rotor platform 37 and the vane type oscillating oil cylinder 18 being attached thereto, the first high pressure soft
Pipe 21,35 synchronous rotary of the second high-pressure hose, rotor platform 37 pass through the 8th hinge 38, toggle swing rod I39, the 9th hinge
40, toggle swing rod II41, the tenth hinge 42 drive the rotating ring 43 of auto-bank unit to rotate, rotor platform 37 and wing drop
The rotation of device rotating ring 43 drives the synchronous rotation of pitch-change-link 15, pull pressure sensor 47, the 7th hinge 17 by the 6th hinge 14
Turn.
While testing machine rotary motion, 11 piston rod of power-assisted oil cylinder pumps, by the 5th hinge 12,
Attachment base 13 drives auto-bank unit, and rotating ring 45, biserial thin-wall bearing 44, rotating ring 43, big ball socket bearing outer ring 9 be not reciprocal
It swings.The reciprocally swinging of auto-bank unit rotating ring 43 passes through the 6th hinge 14, pitch-change-link 15, pull pressure sensor 47, the
20 reciprocally swinging of blade of seven hinges 17, oil cylinder swing rod 16 with movable blade oscillating oil cylinder 18.
Oil liquid when (orientation as shown in Figure 3) is swung the blade 20 of vane type oscillating oil cylinder 18 counterclockwise, in fuel tank 52
By in the second oil pipe 53, second one-way valve 55, the 4th high-pressure hose 29, hydraulic rotary joint shell 30, transmission main shaft 36
Portion's hydraulic oil channel, the second high-pressure hose 35, left side hydraulic fluid port 48 be inhaled into the left chamber of vane type oscillating oil cylinder 18, and and blade
The first check valve 49 that 18 right chamber of formula oscillating oil cylinder is connected is in close state, the oil liquid in 18 right chamber of vane type oscillating oil cylinder
The first high-pressure hose 21, the internal hydraulic pressure oil channel of transmission main shaft 36, hydraulic rotary joint shell 30, third high pressure can only be passed through
Hose 28, the first servo valve 50 enter fuel tank 52, just vane type can control to swing by control 50 valve port size of the first servo valve
The load of oil cylinder 18.
When the vane clockwise (orientation as shown in Figure 3) of vane type oscillating oil cylinder 18 is swung, the oil liquid in fuel tank 52 is logical
Cross the inside of the first oil pipe 51, the first check valve 49, third high-pressure hose 28, hydraulic rotary joint shell 30, transmission main shaft 36
Hydraulic oil channel, the first high-pressure hose 21 are inhaled into the right chamber of vane type oscillating oil cylinder 18, and left with vane type oscillating oil cylinder 18
The second one-way valve 55 that chamber is connected is in close state, and the oil liquid in 18 left chamber of vane type oscillating oil cylinder can only be high by second
Pressure hose 35, the internal hydraulic pressure oil channel of transmission main shaft 36, hydraulic rotary joint shell 30, the 4th high-pressure hose 29, second are watched
Valve 54 is taken into fuel tank, just can control the load of load cylinder by control 54 valve port size of the second servo valve.
Specific examples are applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Illustrate to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to
According to thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811282484.8A CN109187019B (en) | 2018-10-31 | 2018-10-31 | Swing cylinder loaded main rotor ball hinge bearing comprehensive testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811282484.8A CN109187019B (en) | 2018-10-31 | 2018-10-31 | Swing cylinder loaded main rotor ball hinge bearing comprehensive testing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109187019A true CN109187019A (en) | 2019-01-11 |
| CN109187019B CN109187019B (en) | 2019-07-26 |
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ID=64940992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811282484.8A Active CN109187019B (en) | 2018-10-31 | 2018-10-31 | Swing cylinder loaded main rotor ball hinge bearing comprehensive testing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109187019B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213101A (en) * | 2020-10-16 | 2021-01-12 | 中国直升机设计研究所 | Durability test bed for torsion arm swing-proof bearing of helicopter |
| CN113532859A (en) * | 2021-08-27 | 2021-10-22 | 中浙高铁轴承有限公司 | Engine input end shafting bearing testing machine and testing method |
| CN114184543A (en) * | 2021-12-06 | 2022-03-15 | 湖南楚榆智能科技有限公司 | Axle sleeve friction coefficient testing machine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213101A (en) * | 2020-10-16 | 2021-01-12 | 中国直升机设计研究所 | Durability test bed for torsion arm swing-proof bearing of helicopter |
| CN112213101B (en) * | 2020-10-16 | 2022-06-17 | 中国直升机设计研究所 | Durability test bed for torsion arm swing-proof bearing of helicopter |
| CN113532859A (en) * | 2021-08-27 | 2021-10-22 | 中浙高铁轴承有限公司 | Engine input end shafting bearing testing machine and testing method |
| CN113532859B (en) * | 2021-08-27 | 2024-06-07 | 中浙高铁轴承有限公司 | Engine input end shafting bearing testing machine and testing method |
| CN114184543A (en) * | 2021-12-06 | 2022-03-15 | 湖南楚榆智能科技有限公司 | Axle sleeve friction coefficient testing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109187019B (en) | 2019-07-26 |
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