CN109765061A - Used in Suspended Truss of Passenger Car bench test mechanism - Google Patents
Used in Suspended Truss of Passenger Car bench test mechanism Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 68
- 230000007246 mechanism Effects 0.000 title claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000000725 suspension Substances 0.000 claims abstract description 61
- 229910052742 iron Inorganic materials 0.000 claims abstract description 34
- 238000001228 spectrum Methods 0.000 claims abstract description 12
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- 238000013461 design Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
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- 238000005859 coupling reaction Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
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Abstract
The present invention relates to a kind of Used in Suspended Truss of Passenger Car bench test mechanisms, it is characterized by: iron portal frame, supporting adn fixing device, lateral loading device, longitudinal loading device and vertical loading device are fixed on iron floor, suspension system is fixed on supporting adn fixing device, vertical loading device is fixed on iron portal frame, and lateral loading device is connect with the lower part load seat of synthesis adding carrier, longitudinal loading device is connect by oscillating bearing with the side load seat of comprehensive adding carrier, vertical loading device loads seat with the top of comprehensive adding carrier and connect；Comprehensive adding carrier is fixed in suspension system；Control section is equipped with the controller of MiTS basic function software and Replication loading spectrum iterative software using moog company, it simulation test mechanism can reappear the real vehicle failure conditions of suspension system and predict real vehicle service life indoors, product quality problem can be found that in product development stage, and then experimentation cost is reduced, improve research and development of products efficiency.
Description
Technical field
The present invention relates to a kind of Used in Suspended Truss of Passenger Car bench test mechanisms, specifically a kind of for carrying out passenger car
Suspension system performance and the Used in Suspended Truss of Passenger Car bench test mechanism of road analogy bench test, belong to auto parts and components, son
System stage testing technical field.
Background technique
Automotive suspension is the important device of connection vehicle body and wheel elastic in automobile.It is generally by elastic element, guiding
The components such as mechanism, damper are constituted, and main task is to mitigate the impact that vehicle body is transmitted to by uneven road surface, to improve by bus comfortable
Property, while also playing a part of supporting vehicle body.
Currently, the bench test for automobile suspension system mainly individually tests the main parts size in suspension
And based on being loaded mostly with individual event, i.e., longitudinally, laterally components are being loaded respectively, it is multiple with real vehicle state lower suspension system
Miscellaneous stress condition difference is larger, causes the failure mode of rack and considered repealed form inconsistent, can not really play inspection
The effect of product.For vehicle road test and vehicle bench test suspension system can only be carried out simple endurance test and at
This is higher, and the country there is no effective and feasible research technique sufficiently to verify Used in Suspended Truss of Passenger Car.
Summary of the invention
In order to solve the above-mentioned technical problem, the purpose of the present invention is to provide a kind of Used in Suspended Truss of Passenger Car bench test machines
Structure is assembled by the combination of multiple test fixtures and hydraulic actuator, and controller combines multiple actuator and controls, which can
To carry out the bench tests such as multichannel, the Used in Suspended Truss of Passenger Car performance of load spectrum load and road analogy.
The technical scheme of the present invention is realized as follows: a kind of Used in Suspended Truss of Passenger Car bench test mechanism, including test
Loading section and control section；Test loading section include iron floor, iron portal frame, supporting adn fixing device, lateral loading device,
Longitudinal loading device, vertical loading device, comprehensive adding carrier and suspension system；It is characterized by: iron portal frame, support are fixed
Device, lateral loading device, longitudinal loading device and vertical loading device are fixed on by the cooperation of bolt and T-nut
On iron floor, suspension system is fixed on supporting adn fixing device, and vertical loading device is fixed on iron portal frame, laterally load dress
It sets through oscillating bearing and to load that seat connect, longitudinal loading device passes through oscillating bearing and comprehensive load with the lower part of comprehensive adding carrier
The side load seat connection of body, vertical loading device load seat with the top of comprehensive adding carrier by oscillating bearing and connect；It is comprehensive
Adding carrier is fixed in suspension system；
The supporting adn fixing device includes two-sided fixing seat, transverse slat, damper jockey, preceding jockey, middle connection folder
Tool, rear jockey；Wherein two-sided fixing seat is bolted on iron floor, and transverse slat is fixed on double by T-type lower margin block
In the fixing seat of face, suspension system is connected by each jockey with transverse slat；There are T-type groove, transverse slat in the two sides of two-sided fixing seat
It is moved up and down along T-slot；Damper in suspension system is fixed with damper jockey, before the main body of suspension system is used
Jockey, middle jockey, rear jockey are fixed, and then preceding jockey, middle jockey, rear jockey are fixed
On transverse slat；
The lateral loading device includes load actuator, fixing seat, connecting rod, oscillating bearing, actuator suspension arrangement, work
Dynamic device lifting device；Wherein actuator suspension arrangement is by column, horizontal support plate, pendulum spring, adjustment screw composition；Column is fixed
On iron floor, horizontal support plate is fixed on column, and adjustment screw is to be threadedly coupled with horizontal support plate, and pendulum spring one end hangs actuation
Device, the other end are hung in adjustment screw；Actuator lifting device is by lifting screw, adjusting nut, fixed plate composition, fixed plate
It is fixed in fixing seat, lifting screw one end is fixed on hole of the other end in fixed plate on the connecting plate of actuator, with tune
Whole nut connection；The rear end of load actuator is fixed in fixing seat by connecting plate, and front end passes through connecting rod and oscillating bearing
It is connected, the ball head of oscillating bearing is connected by pin with comprehensive adding carrier；
The structure of longitudinal loading device is identical with the lateral structure of loading device, including load actuator, fixed
Seat, connecting rod, oscillating bearing, actuator suspension arrangement, actuator lifting device are different from the comprehensive link position of adding carrier.
The vertical loading device includes load actuator, load transition plates, connecting rod, oscillating bearing；Load actuation
The rear end of device is fixed on the crossbeam of iron portal frame by connecting plate, and front end is connect with load transition plates, and one end of connecting rod is solid
It is scheduled in load transition plates, the other end is connect by oscillating bearing with comprehensive adding carrier；Wherein connecting rod is for two and mutual
In parallel；
The synthesis adding carrier includes main body, fixation hole, laterally load seat, longitudinal direction load seat, Plumb load seat, wherein main body
Size matched with the size of the wheel rim of suspension system, load seat connect with oscillating bearing.
The iron floor is equipped with the T-slot for putting T-nut.
The portal frame includes crossbeam, column, and crossbeam is bolted on column.
The test loading section is mid-plane or so symmetrical structure.
The load transition plates and load actuator and there is tensioning locking plate to carry out locking with the junction of connecting rod.
The control section is equipped with MiTS basic function software and Replication loading spectrum iteration using moog company
The controller of software, the controller can in test mechanism lateral load actuator, longitudinal load actuator, it is vertical plus
Carrying actuator, totally 6 load actuator are connected；It is incorporated in the load data for the suspension system that test site acquisition comes first, by white
Noise seeks transmission function, then carries out successive ignition by software and obtain test driving signal, and controller is according to driving signal driving 6
A load actuator, and then the Used in Suspended Truss of Passenger Car road analogy rack examination of multichannel, load spectrum load can be carried out
It tests.
The positive effect of the present invention is that it simulation test mechanism can reappear the real vehicle failure conditions of suspension system simultaneously indoors
It predicts real vehicle service life, can find that product quality problem in product development stage, shorten actual road test and bench test week
Phase reduces experimentation cost, improves research and development of products efficiency, reduces product market claim rate.Testing method more originally, assessment
The timing node of suspension system reliability mentions the time or so the previous year, and as a result accuracy is by original basic uncorrelated with real vehicle,
Suspension system real vehicle failure mode and service life can be accurately reflected by being increased to.In addition the test mechanism can also be in suspension system
Each components carry out the bench tests such as performance, static strength, endurance life respectively, should compared with original components bench test
Mechanism is easier to adjust, and structure is mentioned closer to real vehicle, the structure and actuator suspension arrangement of jockey, actuator lifting device
High bench test efficiency and accuracy.
Detailed description of the invention
Fig. 1 show structural schematic diagram of the invention.
Fig. 2 show supporting adn fixing device schematic diagram in the present invention.
Fig. 3 show in the present invention lateral loading device schematic diagram.
Fig. 4 show in the present invention longitudinal loading device schematic diagram.
Fig. 5 show vertical loading device schematic diagram in the present invention.
Fig. 6 show comprehensive adding carrier structural schematic diagram.
In figure: 1, iron portal frame；2, comprehensive adding carrier；3, suspension system；4, iron floor；5, two-sided fixing seat；6, transverse slat；
7, damper jockey；8, middle jockey;9, preceding jockey；10, rear jockey；11, actuator is loaded；12, solid
Reservation；13, connecting rod；14, oscillating bearing；15, actuator suspension arrangement；16, actuator lifting device；17, transition plates is loaded.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
The present invention will be further described for body embodiment: as shown in Figures 1 to 5, a kind of Used in Suspended Truss of Passenger Car bench test mechanism,
Including test loading section and control section；Test loading section includes iron portal frame 1, comprehensive adding carrier 2, suspension system 3, iron
Floor 4, supporting adn fixing device, lateral loading device, longitudinal loading device, vertical loading device；It is characterized by: iron portal frame
1, supporting adn fixing device, lateral loading device, longitudinal loading device and vertical loading device matching by bolt and T-nut
Conjunction is fixed on iron floor 4, and suspension system 3 is fixed on supporting adn fixing device, and vertical loading device is fixed on iron portal frame 1
On, lateral loading device, longitudinal loading device, vertical loading device are all connect with comprehensive adding carrier 2, and comprehensive adding carrier 2 is fixed
In suspension system 3.
As shown in Figure 1, there is the T-slot A that can put T-nut on the iron floor 4.
As shown in Figure 1, the portal frame 1 includes crossbeam 1a, column 1b, middle cross beam 1a can be bolted
Different height on column 1b meets test requirements document.
As shown in Fig. 2, the two-sided fixing seat 5 in the supporting adn fixing device is bolted on iron floor 4, it is horizontal
Plate 6 is fixed in two-sided fixing seat 5 by the cooperation of bolt and T-nut, and suspension system 3 passes through 7 damper of jockey
Jockey, jockey is connected with transverse slat 6 behind jockey, 10 before jockey, 9 in 8.Wherein two-sided fixing seat 5
Two sides is equipped with the T-slot slided for T-nut, and transverse slat 6 can be moved up and down along T-slot A.Damper jockey 7 is used for
Damper in fixed suspension system 3, the master of the fixed suspension system 3 of middle jockey 8, preceding jockey 9, rear jockey 10
Body.All jockeies have ribs, to increase the intensity of fixture.The fixed point of transverse slat 6 and each jockey is elongated slot
Hole, conducive to the adjustment and installation of jockey.The design of each jockey is to rely on vehicle digital-to-analogue and exist with reference to suspension system
Stationary state on real vehicle is designed.Different can be hanged by adjusting jockey or the method for replacing jockey
Frame system is fixed on supporting adn fixing device.
As shown in figure 3, the lateral loading device includes load actuator 11, fixing seat 12, connecting rod 13, joint shaft
Hold 14, actuator suspension arrangement 15, actuator lifting device 16.The rear end of load actuator 11 is fixed on fixation by connecting plate
On seat 12, wherein the two sides of fixing seat 12 is equipped with the T-slot slided for T-nut, and load actuator 11 can be along T-slot A
It moves up and down.Front end is connected by connecting rod 13 with oscillating bearing 14, and the ball head of oscillating bearing 14 passes through pin and synthesis
Adding carrier 2 is connected.
Wherein actuator suspension arrangement 15 is by column 15a, horizontal support plate 15b, pendulum spring 15c, adjustment screw 15d group
At；Its central post 15a is fixed on iron floor 4, and horizontal support plate 15b is fixed on column 15a, adjustment screw 15d and horizontal support plate 15b
To be threadedly coupled, the one end pendulum spring 15c suspension load actuator 11, the other end is hung on adjustment screw 15d.
Actuator lifting device 16 is made of lifting screw 16a, adjusting nut 16b, fixed plate 16c；Fixed plate 16c is solid
It is scheduled in fixing seat 12, the one end lifting screw 16a is fixed on the other end on the connecting plate of load actuator 11 and passes through fixed plate 16c
On hole, connect with adjusting nut 16d.
The actuator suspension arrangement 15 can prevent load actuator 11 because damaging caused by falling, and can also subtract
Lateral force suffered by master cylinder in actuator 11 is loaded less rotates adjustment screw 15d, pendulum spring 15c is just to increase its service life
It can stretch or load actuator 11 is driven to go up and down.It can by the cooperation of actuator lifting device 16 and actuator suspension arrangement 15
To adjust the height of load actuator 11 in the case where no overhead traveling crane.
As Figure 1 and Figure 4, the structure of longitudinal loading device and the structure and principle of lateral loading device are complete
It is identical, including load actuator 11, fixing seat 12, connecting rod 13, oscillating bearing 14, actuator suspension arrangement 15, actuator liter
Falling unit 16.Only different from the comprehensive link position of adding carrier 2, lateral loading device passes through oscillating bearing and comprehensive adding carrier
The connection of lower part load seat, longitudinal loading device connect by oscillating bearing with the side load seat of comprehensive adding carrier.Herein not
It is repeating.
As shown in figure 5, the vertical loading device includes load actuator 11, load transition plates 17, connecting rod 13, closes
Bearings 14, the rear end of load actuator 11 is fixed on the gantry, and the front end and load transition plates 17 for loading actuator 11 connect
It connects, one end of connecting rod 13 is fixed in load transition plates 17, the top that the other end passes through oscillating bearing 14 and comprehensive adding carrier 2
Load seat 2e connection.Wherein connecting rod 13 is two and to be parallel to each other, load transition plates 17 and load actuator 11 and with even
The junction of extension bar 13 has tensioning locking plate to carry out locking.
As shown in fig. 6, the synthesis adding carrier 2 includes main body 2a, fixation hole 2b, laterally load seat 2c, longitudinal load
Seat 2d, Plumb load seat 2e, wherein the size of main body 2a is referring to the size matched design with the wheel rim of suspension system 3, fixation hole
2a is consistent with the bolt pore size of the matched wheel rim of suspension system 3.Load seat is two identical boss, is welded on main body 2a
On, it laterally loads seat 2c, longitudinal load seat 2d, Plumb load seat 2e and connects respectively with lateral, longitudinal, vertical oscillating bearing 14
It connects, comprehensive adding carrier 2 can be made to reach complete mechanical decoupling in this way, eliminate the influence of movement coupling.
Test loading section as shown in Figure 1 is about the symmetrical structure of mid-plane or so, antimeric structure
It is identical with principle, it is not repeating herein.
The control section is equipped with MiTS basic function software and Replication loading spectrum iteration using moog company
The controller of software, the controller can be connected with 6 load actuator 11 in test mechanism.The controller pair
6 actuator are carried out while being controlled, and acquire the load spectrum in 6 channels of the test specimen under typical condition, and it is logical that 6 are converted to after processing
The bench test in road loads spectrum, seeks transmission function by white noise, carries out load iteration using Replication software, obtains
To reach test requirements document precision bench test driving spectrum can be used to subsequent bench test.Utilize the bench test of test specimen
Service life, the corresponding real vehicle mileage of acquisition load spectrum can estimate that test specimen makes on real vehicle according to fatigue damage theories are waited
Use the service life.
When carrying out suspension system performance test, first test loading section Virtual assemble in three-dimensional software, further according to three
Dimension data in dimension software assembles actual test loading section.First iron portal frame 1, supporting adn fixing device, cross
It is fixed on iron floor 4 to loading device, longitudinal loading device by the cooperation of bolt and T-nut, then suspension system 3 is consolidated
It is scheduled on supporting adn fixing device, comprehensive adding carrier 2 is fixed in suspension system 3, vertical loading device is fixed on iron gantry
On frame 1, finally the load actuator 11 and comprehensive load of lateral loading device, longitudinal loading device and vertical loading device
Body 2 connects.Control section and 6 load actuator 11 of test loading section are linked together with data line again.According to examination
It tests outline to require to write the loading procedure of controller, control section passes through the servo of control load actuator 11 according to loading procedure
Valve opening loads load actuator to suspension system, and exports corresponding test data.
When carrying out suspension system endurance test, installation step is as when performance test.Setting for control section is hung down
Displacement-control mode is used to load actuator, sample is applied through comprehensive adding carrier 2 by connecting rod 13 and oscillating bearing 14
Bounce warpage load.Laterally load linear actuator and longitudinal load actuator are all made of load control mode, pass through connecting rod
13 apply transverse load and longitudinal loading to sample through comprehensive adding carrier 2 with oscillating bearing 14 respectively.Each load actuator 11 is equal
Using real vehicle load spectrum as inputting, the stress and real vehicle of sample are completely the same.
By structure, design and the installation process of above-mentioned Used in Suspended Truss of Passenger Car bench test mechanism it is found that entire suspension system
System may be mounted on supporting adn fixing device, be loaded by 6 actuator.Wherein controller can be to 6 load actuator
It is respectively controlled, thus a variety of bench tests can be carried out to some components in entire suspension system or system and tested
Card.
The invention is reasonable in design, and supporting adn fixing device adjustability is bigger, is connected using fixture and suspension system
The mode connect, can by adjusting or replacement fixture method be fixed the forward and backward subframe of most of passenger car.Each group
Designed at structure using assembled structure, devise Special lifting device, reserved multiple lifting rope hanging holes, assembling, adjust with
And disassembly is all very convenient, this structure has versatile, and adjustability is strong, and its structure optimization, tooling loss of weight and installs
Journey is simple and easy, to reduce Capability Requirement and labor intensity that testing stand builds personnel.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention creation, all in the present invention
Within the spirit and principle of creation, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the invention
Within the scope of shield.
Claims (6)
1. a kind of Used in Suspended Truss of Passenger Car bench test mechanism, including test loading section and control section；Test loading section
Including iron floor, iron portal frame, supporting adn fixing device, lateral loading device, longitudinal loading device, vertical loading device, synthesis
Adding carrier and suspension system；It is characterized by: iron portal frame, supporting adn fixing device, lateral loading device, longitudinal loading device
And vertical loading device is fixed on iron floor by the cooperation of bolt and T-nut, it is solid that suspension system is fixed on support
Determine on device, vertical loading device is fixed on iron portal frame, and lateral loading device passes through oscillating bearing and comprehensive adding carrier
The connection of lower part load seat, longitudinal loading device connect by oscillating bearing with the side load seat of comprehensive adding carrier, Plumb load
Device loads seat with the top of comprehensive adding carrier by oscillating bearing and connect；Comprehensive adding carrier is fixed in suspension system；
The supporting adn fixing device includes two-sided fixing seat, transverse slat, damper jockey, preceding jockey, middle connection folder
Tool, rear jockey；Wherein two-sided fixing seat is bolted on iron floor, and transverse slat is fixed on double by T-type lower margin block
In the fixing seat of face, suspension system is connected by each jockey with transverse slat；There are T-type groove, transverse slat in the two sides of two-sided fixing seat
It is moved up and down along T-slot；Damper in suspension system is fixed with damper jockey, before the main body of suspension system is used
Jockey, middle jockey, rear jockey are fixed, and then preceding jockey, middle jockey, rear jockey are fixed
On transverse slat；
The lateral loading device includes load actuator, fixing seat, connecting rod, oscillating bearing, actuator suspension arrangement, work
Dynamic device lifting device；Wherein actuator suspension arrangement is by column, horizontal support plate, pendulum spring, adjustment screw composition；Column is fixed
On iron floor, horizontal support plate is fixed on column, and adjustment screw is to be threadedly coupled with horizontal support plate, and pendulum spring one end hangs actuation
Device, the other end are hung in adjustment screw；Actuator lifting device is by lifting screw, adjusting nut, fixed plate composition, fixed plate
It is fixed in fixing seat, lifting screw one end is fixed on hole of the other end in fixed plate on the connecting plate of actuator, with tune
Whole nut connection；The rear end of load actuator is fixed in fixing seat by connecting plate, and front end passes through connecting rod and oscillating bearing
It is connected, the ball head of oscillating bearing is connected by pin with comprehensive adding carrier；
The structure of longitudinal loading device is identical with the lateral structure of loading device, including load actuator, fixed
Seat, connecting rod, oscillating bearing, actuator suspension arrangement, actuator lifting device are different from the comprehensive link position of adding carrier;
The vertical loading device includes load actuator, load transition plates, connecting rod, oscillating bearing；Load actuator
Rear end is fixed on the crossbeam of iron portal frame by connecting plate, and front end is connect with load transition plates, and one end of connecting rod is fixed on
It loads in transition plates, the other end is connect by oscillating bearing with comprehensive adding carrier；Wherein connecting rod is two and is parallel to each other；
The synthesis adding carrier includes main body, fixation hole, laterally load seat, longitudinal direction load seat, Plumb load seat, wherein main body
Size matched with the size of the wheel rim of suspension system, load seat connect with oscillating bearing.
2. a kind of Used in Suspended Truss of Passenger Car bench test mechanism according to claim 1, the iron described in being characterized in that
Floor is equipped with the T-slot for putting T-nut.
3. a kind of Used in Suspended Truss of Passenger Car bench test mechanism according to claim 1, the dragon described in being characterized in that
Door frame includes crossbeam, column, and crossbeam is bolted on column.
4. a kind of Used in Suspended Truss of Passenger Car bench test mechanism according to claim 1, the examination described in being characterized in that
Testing loading section is mid-plane or so symmetrical structure.
5. a kind of Used in Suspended Truss of Passenger Car bench test mechanism according to claim 1 adds in being characterized in that described
It carries transition plates and loads actuator and there is tensioning locking plate to carry out locking with the junction of connecting rod.
6. a kind of Used in Suspended Truss of Passenger Car bench test mechanism according to claim 1, the control described in being characterized in that
System part is equipped with the controller of MiTS basic function software and Replication loading spectrum iterative software, institute using moog company
The controller stated can add for 6 totally with lateral load actuator, longitudinal load actuator, the Plumb load actuator in test mechanism
Actuator is carried to be connected；It is incorporated in the load data for the suspension system that test site acquisition comes first, transmitting letter is sought by white noise
Number, then successive ignition is carried out by software and obtains test driving signal, controller drives 6 load actuator according to driving signal,
And then the Used in Suspended Truss of Passenger Car road analogy bench test of multichannel, load spectrum load can be carried out.
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Cited By (10)
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| CN110132564A (en) * | 2019-05-28 | 2019-08-16 | 中车青岛四方机车车辆股份有限公司 | Experimental rig for hanging type aerial train bolster |
| CN110274775A (en) * | 2019-07-30 | 2019-09-24 | 奇瑞商用车（安徽）有限公司 | A kind of automobile multi-link lever suspension fork system stage testing tooling |
| CN111024412A (en) * | 2019-12-09 | 2020-04-17 | 浙江大学 | Wheel hub and suspension comprehensive performance test bed for multi-axis direction loading |
| CN111022872A (en) * | 2019-12-12 | 2020-04-17 | 中国第一汽车股份有限公司 | Actuator fixing device |
| CN111707482A (en) * | 2020-06-10 | 2020-09-25 | 中国第一汽车股份有限公司 | Eight-channel multifunctional suspension road simulation test bed |
| CN111964925A (en) * | 2020-07-23 | 2020-11-20 | 中国第一汽车股份有限公司 | Eight-channel road simulation test system and test method for suspension system |
| CN112284771A (en) * | 2019-07-25 | 2021-01-29 | 浙江吉利汽车研究院有限公司 | Fatigue test system and method for vehicle suspension system |
| CN113029783A (en) * | 2021-03-09 | 2021-06-25 | 一汽解放汽车有限公司 | Two-degree-of-freedom loading bench test equipment for leaf spring |
| CN114623992A (en) * | 2022-03-14 | 2022-06-14 | 一汽解放汽车有限公司 | Leaf spring loading test bench |
| CN116929689A (en) * | 2023-09-18 | 2023-10-24 | 扬州东升汽车零部件股份有限公司 | Fatigue testing device for cab suspension system |
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