CN106840708A - Gear box casing deformation test method - Google Patents
Gear box casing deformation test method Download PDFInfo
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- CN106840708A CN106840708A CN201710188740.6A CN201710188740A CN106840708A CN 106840708 A CN106840708 A CN 106840708A CN 201710188740 A CN201710188740 A CN 201710188740A CN 106840708 A CN106840708 A CN 106840708A
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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Abstract
The invention discloses a kind of gear box casing deformation test method, comprise the following steps：Gearbox to be measured is installed into positioning method according to real vehicle to be arranged on test-bed, and the output shaft locking of gearbox to be measured is fixed；The input shaft of gearbox to be measured is connected with the output shaft of torque loading device, and foil gauge or strain rosette are attached at the tested point of selection；Obtain the detection signal of torque sensor and angular displacement sensor in real time by computer, the input shaft to gearbox to be measured is loaded；Record is pasted onto the strain data of the foil gauge or strain rosette on tested point, and the principal stress value of tested point is calculated by ess-strain reduction formula.The present invention can carry out test measurement to the deflection of gear box casing and principal stress value, with accuracy and reliability higher, for gear box casing rigidity and strength test evaluation provide a kind of method of efficiently and accurately, the advantages of providing data support, the reliability of raising gearbox and life-span for transmission design simultaneously.
Description
Technical field
The present invention relates to auto parts and components detection technique field, in particular to a kind of gear box casing deformation test side
Method.
Background technology
Gear box casing is connected as the important foundation part in transmission assembly with the vehicle part such as engine, suspension,
The relevant parts such as the gear in gearbox, axle, bearing and shift fork are assembled into an entirety, are kept between gear, shafting
Correct position, and them is transmitted power in phase according to certain drive connection.Each axle of speed changer passes through bearings
On casing, during gear drive, casing bears larger load, while power it bears vehicle braking or accelerates again when
The inertia force that assembly causes with impact and produce larger deformation and stress, therefore the intensity of casing, rigidity and fatigue behaviour are straight
Reliability and the life-span of influence speed changer are connect, and then influences the performance of vehicle.At present, rarely has the intensity to gear box
The research tested with rigidity.
The content of the invention
For above-mentioned the deficiencies in the prior art, the technical problems to be solved by the invention are：How a kind of gearbox is provided
Housing distortion test method, can simulate the load that gearbox housing in vehicle travel process is born, to gear box casing
Deflection and principal stress value carry out test measurement, be gear box casing rigidity and strong with accuracy and reliability higher
Degree test evaluation provides a kind of method of efficiently and accurately, while being supported for transmission design provides data, improves gearbox
Reliability and life-span.
In order to solve the above-mentioned technical problem, present invention employs following technical scheme：
A kind of gear box casing deformation test method, it is characterised in that comprise the following steps：
A, gearbox to be measured is installed into positioning method according to real vehicle it is arranged on test-bed, and by the defeated of gearbox to be measured
Shaft locking is fixed；
B, the input shaft of gearbox to be measured is connected with the output shaft of torque loading device, and moment of torsion is set between
Sensor and angular displacement sensor, are respectively used to the corner of the output shaft of detection torque loading device and are applied to gearbox to be measured
Input shaft moment of torsion；
C, the tested point for choosing on the housing of gearbox to be measured housing distortion, and are attached to selection by foil gauge or strain rosette
Tested point at；
D, the detection signal for obtaining torque sensor and angular displacement sensor in real time by computer, before gearbox is linked into
Enter in gear or reverse gear, control mode loading device is carried out to the input shaft of gearbox to be measured by the way of closed-loop control
Loading, during loading, is first gradually increased to torque setting value in time t1 by the output torque of torque loading device by zero, and
Stabilization is kept in time t2, then zero is gradually decrease to by the torque setting value in time t3；
E, record are pasted onto the strain data of foil gauge or strain rosette on tested point, by stress-strain reduction formula
It is calculated the principal stress value of tested point.
Using the above method, gearbox is linked into advance or reverse gear, by torque loading device to the defeated of gearbox
Enter axle to be loaded, because the output shaft of gearbox fixes locking so that the input shaft and output shaft of gearbox exist relative
Torsional deflection, changes the stressing conditions at housing bearings, moment of torsion is applied on gear box casing, causes gear box casing
Deformation, the strain data of gear box casing is detected using foil gauge or strain rosette, it is public by the conversion of stress-strain
Formula, can obtain accurate principal stress value.It is able to ensure that what torque loading device was exported using the close-loop control mode of computer
Torque precision is higher, and reliable and stable；Moment of torsion by zero is gradually increased to torque setting value and is gradually reduced by torque setting value
To zero loading procedure, the dynamic deformation process of gear box casing can be tested；Moment of torsion is maintained at torque setting value,
The static deformation process of gear box casing can be tested.So, the dynamic and static state to gear box casing can be completed
Deformation process is tested, and close to the physical constraint situation of gearbox, is conducive to improving the reliability and accuracy tested.Set
Angular displacement sensor, can control adjustment speed changer initial position by angle, eliminate interval, in order to carry out moment of torsion control,
Be conducive to improving the accuracy for measuring.
Further, in the step D, during gearbox is linked into 1 grade, 2 grades and is reversed gear respectively, to being on different gears
The input shaft of gearbox to be measured is loaded, and gradually increases the output torque of torque loading device by zero in identical time t1
Same torque setting value is added to, and stabilization is kept in identical time t2, then set by the moment of torsion in identical time t3
Definite value is gradually decrease to zero.
Because 1 grade of gearbox, 2 gears and the speed reversed gear are than larger, output speed is low and moment of torsion is big, so in 1 grade, 2 gears and R
Moment of torsion, engagement force and the stressed shell that gear gear is transmitted are all than larger.Using above-mentioned operating mode loading method, change can be simulated
The larger situation of fast tank shell stress during actual travel, is conducive to improving the efficiency and accuracy tested.
Further, in the step D, on same gear, multiple different torque setting values are respectively adopted to be measured
The input shaft of gearbox is loaded, it is ensured that t1, t2 and t3 the difference correspondent equal in each loading procedure.
Using the above method, in different torque setting values, control t1, t2 and t3 difference correspondent equal so that in phase
In same time t1 and identical time t3, due to the difference of amplitude so that the slope of moment of torsion loading curve can change, this
Sample, can test the dynamic deformation process of housing during different dynamic loads.And by different torque setting values
It is kept stable in identical time t2, transmission housing deformation process under different static amplitude load conditions can be surveyed
Examination.So, the steady state loading of the suffered different amplitudes during actual travel of gearbox, different slopes can be tested
Deformation under dynamic load change, can effectively improve the efficiency and accuracy of experiment.
In sum, the present invention has can simulate the load that gearbox housing in vehicle travel process is born, right
The deflection and principal stress value of gear box casing carry out test measurement, are transmission housing with accuracy and reliability higher
Body rigidity and strength test evaluation provide a kind of method of efficiently and accurately, while being supported for transmission design provides data, carry
The advantages of reliability of gearbox high and life-span.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the gear box casing deformation test system of use the inventive method.
Fig. 2 is that moment of torsion amplitude is 100Nm loading curves 1 when gearbox is in a file location.
Fig. 3 is that moment of torsion amplitude is 100Nm loading curves 2 when gearbox is in a file location.
Fig. 4 is that moment of torsion amplitude is 200Nm loading curves 1 when gearbox is in a file location.
Fig. 5 is that moment of torsion amplitude is 200Nm loading curves 2 when gearbox is in a file location.
Fig. 6 is that moment of torsion amplitude is 270Nm loading curves 1 when gearbox is in a file location.
Fig. 7 is that moment of torsion amplitude is 270Nm loading curves 2 when gearbox is in a file location.
Fig. 8 is that moment of torsion amplitude is 300Nm loading curves 1 when gearbox is in a file location.
Fig. 9 is that moment of torsion amplitude is 300Nm loading curves 2 when gearbox is in a file location.
Figure 10 is strain figure of the measuring point 1 under 200Nm loading levels when gearbox is in a file location.
Figure 11 is calculating stress diagram of the measuring point 1 under 200Nm loading levels when gearbox is in a file location.
Figure 12 is strain figure of the measuring point 2 under 200Nm loading levels when gearbox is in a file location.
Figure 13 is calculating stress diagram of the measuring point 2 under 200Nm loading levels when gearbox is in a file location.
Figure 14 is the 3 principal stress values of gear under 300Nm loading levels of measuring point 1.
Figure 15 is the 3 principal stress values of gear under 300Nm loading levels of measuring point 2.
Figure 16 is the principal stress value under different loading amplitude steady state conditions of measuring point 1 when gearbox is in a file location.
Figure 17 is the principal stress value under different loading amplitude steady state conditions of measuring point 2 when gearbox is in a file location.
Figure 18 is the principal stress difference contrast under different loading amplitude steady state conditions of measuring point 1 when gearbox is in a file location
Figure.
Figure 19 is the principal stress difference contrast under different loading amplitude steady state conditions of measuring point 2 when gearbox is in a file location
Figure.
Specific embodiment
Gear box casing deformation test system and its accompanying drawing with reference to a kind of use the inventive method are made to the present invention
It is further to describe in detail.
During specific implementation：As shown in figure 1, a kind of gear box casing deformation test system, including test-bed device 1 and
TT＆C system 2, the test-bed device 1 includes base 11, the end connecting bracket 12 of the input shaft end for fixing gearbox
And for supporting the end support seat 13 of the output shaft end of gearbox, pressed on the end connecting bracket 12 and end support seat 13
According to the facts car installs positioning method and is provided with gearbox to be measured 14；The base 11 is located at the output shaft of the gearbox to be measured 14
Side is provided with the fixed locking mechanism 15 of the output shaft for fixing locking gearbox to be measured, the gearbox to be measured 14 it is defeated
Shaft is fixedly connected in the fixed locking mechanism 15；The base 11 is located at the one of the input shaft of the gearbox to be measured 14
Side is provided with loader support 16 and the torque loading device 17 on the loader support 16, the moment of torsion loading
The output shaft of device 17 is coaxially connected with the input shaft of the gearbox to be measured 14；The TT＆C system 2 includes being arranged on described
Torque sensor 21 on the output shaft of torque loading device 17, is pasted onto answering on the tested point of the housing of gearbox to be measured 14
Variant sensor 22, data collecting system 23 and computer 24, the torque sensor 21 and strain gauge transducer 22 lead to
Cross the data collecting system 23 and be connected to the computer 24；The computer 24 is also associated with for controlling the moment of torsion to add
The Loading Control device 25 of the output torque for putting 17 is carried, the Loading Control device 25 is connected to the torque loading device 17.
Using said system, by computer controls Loading Control device, major control torque loading device is according to setting value
Input shaft to gearbox to be measured carries out the loading of moment of torsion, because fixed locking mechanism is by the output shaft locking of gearbox to be measured,
So that the input shaft and output shaft of gearbox have relative torsional deflection, change the stressing conditions at housing bearings, make
Moment of torsion is applied on gear box casing, causes the deformation of gear box casing, by the strain being pasted onto on gear box casing to be measured
Formula sensor can detect the strain data of housing, and be input in computer by data collecting system, be calculated master
Stress value, completes the measurement to gear box casing deformation.Torque sensor is installed on the output shaft of torque loading device, is easy to
Data collecting system and computer can get the real-time moment of torsion of torque loading device output, it is possible to achieve moment of torsion is loaded and is filled
Closed-loop control is put, the precision of torque output is improved.
During implementation, the loader support 16 is that lower end has resilient elastic support.
So, it is possible to reduce because sample deformations drive the small torque load of torque loading device when applying torque load,
With buffering and the effect for resetting.
During implementation, the strain gauge transducer 22 is provided with multiple, after being respectively adhered on the output shaft of gearbox to be measured 14
After outer ledge, the jackshaft of bearing hole at the outer ledge of bearing hole, rear shell position of bearings imposed load, middle shell position of bearings
At imposed load and main box outside.
Due to above-mentioned position, to be typically gearbox stress and finite element analysis stress in actual driving conditions larger
Position, setting strain gauge transducer at these positions can obtain more accurately measurement result.
During implementation, the torque loading device 17 is that hydraulic servo reverses actuator.
Hydraulic servo reverses actuator has the characteristics such as dynamic response high precision, load stiffness are big, control power is big.Using
Hydraulic servo reverses actuator and can realize accurately moment of torsion input, is conducive to improving measurement accuracy.
During specific implementation, angular displacement sensor is additionally provided with the output shaft of the torque loading device 17.So, can be with
Speed changer initial position is adjusted by the control of angle, interval is eliminated, in order to carry out moment of torsion control, is conducive to improving what is measured
Accuracy.
During experiment, using following steps：A, above-mentioned gear box casing deformation test system is first obtained, gearbox to be measured is pressed
According to the facts car is installed positioning method and is arranged on test-bed device 1, and the output shaft locking of gearbox to be measured is fixed；
B, the input shaft of gearbox to be measured is connected with the output shaft of torque loading device, and moment of torsion is set between
Sensor and angular displacement sensor, are respectively used to the corner of the output shaft of detection torque loading device and are applied to gearbox to be measured
Input shaft moment of torsion；
C, the tested point for choosing on the housing of gearbox to be measured housing distortion, and are attached to selection by foil gauge or strain rosette
Tested point at；
D, the detection signal for obtaining torque sensor and angular displacement sensor in real time by computer, before gearbox is linked into
Enter in gear or reverse gear, control mode loading device is carried out to the input shaft of gearbox to be measured by the way of closed-loop control
Loading, during loading, is first gradually increased to torque setting value in time t1 by the output torque of torque loading device by zero, and
Stabilization is kept in time t2, then zero is gradually decrease to by the torque setting value in time t3；
E, record are pasted onto the strain data of foil gauge or strain rosette on tested point, by stress-strain reduction formula
It is calculated the principal stress value of tested point.
Using the above method, gearbox is linked into advance or reverse gear, by torque loading device to the defeated of gearbox
Enter axle to be loaded, because the output shaft of gearbox fixes locking so that the input shaft and output shaft of gearbox exist relative
Torsional deflection, changes the stressing conditions at housing bearings, moment of torsion is applied on gear box casing, causes gear box casing
Deformation, the strain data of gear box casing is detected using foil gauge or strain rosette, it is public by the conversion of stress-strain
Formula, can obtain accurate principal stress value.It is able to ensure that what torque loading device was exported using the close-loop control mode of computer
Torque precision is higher, and reliable and stable；Moment of torsion by zero is gradually increased to torque setting value and is gradually reduced by torque setting value
To zero loading procedure, the dynamic deformation process of gear box casing can be tested；Moment of torsion is maintained at torque setting value,
The static deformation process of gear box casing can be tested.So, the dynamic and static state to gear box casing can be completed
Deformation process is tested, and close to the physical constraint situation of gearbox, is conducive to improving the reliability and accuracy tested.Set
Angular displacement sensor, can control adjustment speed changer initial position by angle, eliminate interval, in order to carry out moment of torsion control,
Be conducive to improving the accuracy for measuring.
Wherein, it is to be measured on different gears to being in during gearbox is linked into 1 grade, 2 grades and is reversed gear respectively in the step D
The input shaft of gearbox is loaded, and the output torque of torque loading device is gradually increased to by zero in identical time t1
Same torque setting value, and stabilization is kept in identical time t2, then by the torque setting value in identical time t3
It is gradually decrease to zero.
Because 1 grade of gearbox, 2 gears and the speed reversed gear are than larger, output speed is low and moment of torsion is big, so in 1 grade, 2 gears and R
Moment of torsion, engagement force and the stressed shell that gear gear is transmitted are all than larger.Using above-mentioned operating mode loading method, change can be simulated
The larger situation of fast tank shell stress during actual travel, is conducive to improving the efficiency and accuracy tested.
Wherein, in the step D, on same gear, multiple different torque setting values are respectively adopted to speed change to be measured
The input shaft of case is loaded, it is ensured that t1, t2 and t3 the difference correspondent equal in each loading procedure.
Using the above method, in different torque setting values, control t1, t2 and t3 difference correspondent equal so that in phase
In same time t1 and identical time t3, due to the difference of amplitude so that the slope of moment of torsion loading curve can change, this
Sample, can test the dynamic deformation process of housing during different dynamic loads.And by different torque setting values
It is kept stable in identical time t2, transmission housing deformation process under different static amplitude load conditions can be surveyed
Examination.So, the steady state loading of the suffered different amplitudes during actual travel of gearbox, different slopes can be tested
Deformation under dynamic load change, can effectively improve the efficiency and accuracy of experiment.
Embodiment：Because one grade of two gear of gearbox and the speed reversed gear are than greatly, output speed is low and moment of torsion is big, so one grade,
Two gears and R gear the gear moment of torsion, the engagement force that are transmitted, stressed shell main consider transmission assembly 1 all than larger
The stressing conditions of gear, 2 gears and R gears under input torque effect.
Using Variable Amplitude, the load mode of variable slope, gearbox dynamic and static deformation process of the test, experiment are considered
When, on each gear of 1 gear, 2 gears and R gears, in 20s, respectively by moment of torsion Slow loading to 100Nm, 200Nm, 270Nm and
300Nm, and keep stablizing 20s, then in 20s, will be slowly from 100Nm, 200Nm, 270Nm and 300Nm by moment of torsion respectively
0Nm.During loading, moment of torsion is gradually increased or is reduced, the dynamic deformation process of gear box casing can tested.And by width
Value stabilization for a period of time, can be tested the static deformation process of gear box casing.In the process that moment of torsion increases or reduces
In, because in equal 20s, the amplitude of change in torque is of different sizes so that the slope of amplitude change is different.So, may be used
Measured with to dynamic housing distortion during different dynamic loads.And can be right in different amplitudes by moment of torsion stabilization
Transmission housing deformation process is measured under different static state amplitude load conditions.Moment of torsion load as shown in Fig. 2 to Fig. 9, from add
Carry curve to can be seen that moment of torsion loading stabilization and can well be zeroed, illustrate that this pilot system loading accuracy is high, repeatability
It is good.
During real data treatment, every group of situation of change of data is looked first at, slightly see whether data are normal and repeated
Whether well and by the strain data of each measuring point answered by the master that stress-strain reduction formula is calculated each measuring point
Force value, calculates each measuring point 3 differences of the steady state data of sample under every kind of loading condition, and before loading and after loading it is steady
The difference of state data, with check strain transducer whether the repeatability of working properly and this pilot system.
Strain-EXPERIMENTAL STRAIN-STRESS CONVERSION the formula of three axle Y type isogonism strain rosettes is as follows：
Wherein, εxAnd εyThe respectively normal strain in x-axis and y-axis direction, ε30、ε90And ε150Respectively along 30 °, 90 ° and 150 ° sides
To normal strain, σ1,σ2It is measuring point principal stress, τmaxIt is measuring point maximum shear, γxyIt is shear strain, E is elastic modelling quantity, and ν is pool
Pine ratio.The stress-strain computing formula of uniaxial strain piece is as follows：
σ=E ε (7)
σ is stress, and ε is strain, and E is elastic modelling quantity
A file location is now in speed changer, the axle Y type isogonisms strain rosette of measuring point 1 three, the uniaxial strain piece of measuring point 2 are in 200Nm
As a example by strain-STRESS VARIATION situation under loading level, data processed result is as shown in Figure 10~Figure 13.
After installation and debugging are finished, tested, 5 measuring point R grades, 1 grade and 2 grades each 3 unstrained samples gathered respectively,
Principal stress value is calculated according to formula (1)-(7).Experiment is only illustrated with the strain curve of measuring point 2 under one grade of 200Nm loading levels
As a result.From Fig. 9~Figure 12, during experiment loading, test data stabilization rises, during moment of torsion stabilization, measuring point principal stress and strain
It is held essentially constant, before stress and strain value returns to experiment after unloading, test data can well be zeroed, and illustrate the transmission housing
Body deformation test system has good repeatability.
By taking measuring point 1 and measuring point 2 as an example, Figure 14 is the 3 principal stress values of gear under 300Nm loading levels of measuring point 1；Figure 15
For measuring point 2 under 300Nm loading levels 3 principal stress values of gear；Figure 16 be gearbox be in a file location when measuring point 1 not
With the principal stress value under loading amplitude steady state condition；Figure 17 be gearbox be in a file location when measuring point 2 in different loading amplitudes
Principal stress value under steady state condition；Figure 18 is that measuring point 1 is loaded under amplitude steady state conditions different when gearbox is in a file location
Principal stress difference comparison diagram；Figure 19 is that measuring point 2 is main under different loading amplitude steady state conditions when gearbox is in a file location to be answered
Power difference comparison diagram.
From Figure 14 and 15, under stable state 300Nm loading environments, one grade, two gears and R grades of sample measuring point 1, measuring point 2 should
The tensile strength values of power maximum, respectively less than tank material, meet intensity requirement.
From Figure 16 and 17, measuring point 1, measuring point 2 stress value under different loading levels are different, increase with loading level and lead
Stress value is in increasing trend, and in 300Nm, principal stress value is maximum；From Figure 18 and 19, in same moment of torsion loading level
Under, the stress difference of each measuring point is stable, and with the increase of moment of torsion loading level, stress difference gradually increases, and meets reality
Border situation, sample data repeatability is good, and the stress difference of measuring point 2 is larger, illustrates that the stress value that measuring point 2 bears is larger.Its middle part
S1 initial stress values are different under dividing different moment of torsion loading levels, and mainly experimental test interval is slightly shorter, and foil gauge has remaining answering
Power causes.
As the above analysis, using the case of transmission deformation test system of Hydraulic Servo System Design, loading method
Simply, it is reproducible, high precision, with dynamic response characteristic higher.Using variable slope and Variable Amplitude load mode, comprehensively examine
The dynamic and composite seal deformation process of gearbox are considered, close to the physical constraint situation of speed changer.Result of the test shows, same
Under kind of moment of torsion loading level, the stress difference of each measuring point is stable, with the increase of moment of torsion loading level, stress difference by
It is cumulative to add, tally with the actual situation.
Presently preferred embodiments of the present invention is the foregoing is only, is not limitation with the present invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (3)
1. a kind of gear box casing deformation test method, it is characterised in that comprise the following steps：
A, gearbox to be measured is installed into positioning method according to real vehicle it is arranged on test-bed, and by the output shaft of gearbox to be measured
Locking is fixed；
B, the input shaft of gearbox to be measured is connected with the output shaft of torque loading device, and torque sensing is set between
Device and angular displacement sensor, are respectively used to the corner of the output shaft of detection torque loading device and are applied to the defeated of gearbox to be measured
Enter the moment of torsion of axle；
C, the tested point for choosing on the housing of gearbox to be measured housing distortion, and are attached to treating for selection by foil gauge or strain rosette
At measuring point；
D, the detection signal for obtaining torque sensor and angular displacement sensor in real time by computer, drive shift is linked into by gearbox
In position or reverse gear, control mode loading device is added to the input shaft of gearbox to be measured by the way of closed-loop control
Carry, during loading, the output torque of torque loading device be first gradually increased to torque setting value in time t1 by zero, and when
Between stabilization is kept in t2, be then gradually decrease to zero by the torque setting value in time t3；
E, record are pasted onto the strain data of foil gauge or strain rosette on tested point, are calculated by stress-strain reduction formula
Obtain the principal stress value of tested point.
2. gear box casing deformation test method as claimed in claim 1, it is characterised in that in the step D, will become respectively
During fast case is linked into 1 grade, 2 grades and reverses gear, the input shaft to being in gearbox to be measured on different gears is loaded, in identical
Between the output torque of torque loading device is gradually increased to same torque setting value by zero in t1, and in identical time t2
Stabilization is kept, then zero is gradually decrease to by the torque setting value in identical time t3.
3. gear box casing deformation test method as claimed in claim 1, it is characterised in that in the step D, in same shelves
On position, multiple different torque setting values are respectively adopted the input shaft of gearbox to be measured is loaded, it is ensured that loaded every time
T1, t2 and t3 difference correspondent equal in journey.
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| CN108896305A (en) * | 2018-08-27 | 2018-11-27 | 中国第汽车股份有限公司 | Aluminum enclosure bearing block Thermal-mechanical Coupling strain measurement system and measurement method |
| CN109253711A (en) * | 2018-10-17 | 2019-01-22 | 中南大学 | A kind of stuck method for detecting position of the screw conveyor of balancing earth-pressure shielding machine |
| CN112557011A (en) * | 2020-12-09 | 2021-03-26 | 安徽江淮汽车集团股份有限公司 | Deformation amount testing device |
| CN113591267A (en) * | 2021-06-17 | 2021-11-02 | 东风汽车集团股份有限公司 | Analysis method and device for suspension strength of gearbox shell |
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| 李伟伟、王俊元、马维金、张纪平、陈剑伟: "某轻卡变速箱壳体强度分析", 《机械传动》 * |
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| CN112557011A (en) * | 2020-12-09 | 2021-03-26 | 安徽江淮汽车集团股份有限公司 | Deformation amount testing device |
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