CN206593847U - Gear box casing deformation test system - Google Patents
Gear box casing deformation test system Download PDFInfo
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- CN206593847U CN206593847U CN201720304465.5U CN201720304465U CN206593847U CN 206593847 U CN206593847 U CN 206593847U CN 201720304465 U CN201720304465 U CN 201720304465U CN 206593847 U CN206593847 U CN 206593847U
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Abstract
The utility model discloses a kind of gear box casing deformation test system, including test-bed device and TT＆C system, test-bed device includes base, and end connecting bracket and end support seat that positioning method is provided with gearbox to be measured are installed according to real vehicle；For the fixation locking mechanism for the output shaft for fixing locking gearbox to be measured, loader support and the torque loading device on loader support, the input shaft of the output shaft of torque loading device and gearbox to be measured are coaxially connected；TT＆C system includes the torque sensor on the output shaft of torque loading device, it is pasted onto the strain gauge transducer on the tested point of the housing of gearbox to be measured, data collecting system and computer, torque sensor and strain gauge transducer are connected to computer by data collecting system.The utility model has loading method simple, and control is high with response accuracy, the advantages of reproducible, can improve the efficiency and accuracy of gear box casing deformation test.
Description
Technical Field
The utility model relates to an automobile parts detects technical field, and is very much related to a gearbox housing deformation test system.
Background
The gearbox shell is used as an important basic component in a gearbox assembly and is connected with an engine, a suspension and other finished vehicle components, related parts such as gears, shafts, bearings, shifting forks and the like in the gearbox are assembled into a whole, the correct positions of the gears and a shaft system are kept, and the gears and the shaft system transmit power in a coordinated manner according to a certain transmission relationship. Each shaft of the speed changer is supported on the box body through a bearing, in the gear transmission process, the box body bears larger load, and simultaneously bears the inertia force and impact caused by a power assembly when the whole vehicle brakes or accelerates, and generates larger deformation and stress, so the reliability and the service life of the speed changer are directly influenced by the strength, the rigidity and the fatigue performance of the box body, and the service performance of the whole vehicle is further influenced. At present, the strength and rigidity of the gearbox body are rarely researched.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art, the utility model aims to solve the technical problem that: how to provide a gearbox shell deformation test system which has the advantages of simple loading method, high control and response precision, good repeatability and contribution to improving the efficiency and the accuracy of the gearbox shell deformation test.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the gearbox shell deformation test system is characterized by comprising a test bench device and a measurement and control system, wherein the test bench device comprises a base, an end connecting support and a tail end supporting seat, the end connecting support is used for fixing an input shaft end of a gearbox, the tail end supporting seat is used for supporting an output shaft end of the gearbox, and the gearbox to be tested is mounted on the end connecting support and the tail end supporting seat in a real-vehicle mounting and positioning mode; a fixed locking mechanism for fixedly locking an output shaft of the gearbox to be tested is arranged on one side, located on the output shaft of the gearbox to be tested, of the base, and the output shaft of the gearbox to be tested is fixedly connected to the fixed locking mechanism; a loader bracket and a torque loading device arranged on the loader bracket are arranged on one side of the base, which is positioned on the input shaft of the gearbox to be tested, and the output shaft of the torque loading device is coaxially connected with the input shaft of the gearbox to be tested; the measurement and control system comprises a torque sensor arranged on an output shaft of the torque loading device, a strain type sensor adhered to a point to be measured of a shell of the gearbox to be measured, a data acquisition system and a computer, wherein the torque sensor and the strain type sensor are connected to the computer through the data acquisition system; the computer is also connected with a loading controller used for controlling the output torque of the torque loading device, and the loading controller is connected to the torque loading device.
By adopting the system, the loading controller is controlled by the computer, the torque loading device is mainly controlled to load the torque on the input shaft of the gearbox to be measured according to a set value, the output shaft of the gearbox to be measured is locked by the fixed locking mechanism, so that the input shaft and the output shaft of the gearbox have relative torsional deformation, the stress condition of the bearing support of the shell is changed, the torque is applied to the shell of the gearbox to cause the deformation of the shell of the gearbox, the strain data of the shell can be detected by the strain sensor which is pasted on the shell of the gearbox to be measured, the strain data is input into the computer through the data acquisition system, and the main stress value is obtained by calculation, so that the measurement of the deformation of the shell of the gearbox is. The torque sensor is arranged on the output shaft of the torque loading device, so that a data acquisition system and a computer can acquire the real-time torque output by the torque loading device conveniently, the closed-loop control of the torque loading device can be realized, and the torque output precision is improved.
Furthermore, the loader support is an elastic support with elasticity at the lower end.
Therefore, the torsion load of the torque loading device driven by the deformation of the sample when the torsion load is applied can be reduced, and the buffer and reset functions are achieved.
Furthermore, the strain gauge sensors are arranged in a plurality of manners and respectively adhered to the outer side edge of the rear bearing hole of the output shaft of the gearbox to be tested, the outer side edge of the rear bearing hole of the intermediate shaft, the position of the rear shell bearing where a load is applied, the position of the middle shell bearing where a load is applied and the outer side of the main box body.
Because the positions are generally positions where the stress of the gearbox is stressed in the actual driving process and the stress of finite element analysis is large, strain sensors are arranged at the positions, and more accurate measurement results can be obtained.
Further, the torque loading device is a hydraulic servo torsion actuator.
The hydraulic servo torsion actuator has the characteristics of high dynamic response precision, high load rigidity, high control power and the like. Accurate torque input can be realized by adopting the hydraulic servo torsion actuator, and the measurement accuracy is favorably improved.
To sum up, the utility model has the advantages of loading method is simple, and control and response precision are high, and repeatability is good, can improve gearbox housing deformation test's efficiency and accuracy.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 shows the loading curve 1 for a torque magnitude of 100Nm with the gearbox in first gear position.
Fig. 3 shows the loading curve 2 for a torque magnitude of 100Nm with the gearbox in first gear position.
Fig. 4 shows the loading curve 1 for a torque amplitude of 200Nm with the gearbox in first gear position.
Fig. 5 shows the loading curve 2 for a torque amplitude of 200Nm with the gearbox in first gear position.
Fig. 6 shows the loading curve 1 for a torque magnitude of 270Nm with the gearbox in first gear position.
Fig. 7 shows the loading curve 2 for a torque magnitude of 270Nm with the gearbox in first gear position.
Fig. 8 shows the loading curve 1 for a torque magnitude of 300Nm with the gearbox in first gear position.
Fig. 9 shows the loading curve 2 for a torque magnitude of 300Nm with the gearbox in first gear position.
FIG. 10 is a strain plot at point 1 at 200Nm loading level with the transmission in the first gear position.
FIG. 11 is a graph of the calculated stress at point 1 at 200Nm loading level when the transmission is in first gear position.
FIG. 12 is a strain plot at point 2 at a 200Nm loading level with the transmission in the first gear position.
FIG. 13 is a graph of the calculated stress at point 2 at a loading level of 200Nm when the transmission is in first gear position.
FIG. 14 is the principal stress values for 3 gears at 300Nm loading level at test point 1.
FIG. 15 is the principal stress values for 3 gears at 300Nm loading level at test point 2.
FIG. 16 shows the main stress values of the measuring point 1 under the steady-state working conditions with different loading amplitudes when the transmission is in the first gear position.
FIG. 17 shows the main stress values of the measuring point 2 under the steady-state working conditions with different loading amplitudes when the transmission is in the first gear position.
FIG. 18 is a comparison graph of the difference of main stresses at the measuring point 1 under different loading amplitude steady-state operating conditions when the transmission is at the first gear position.
FIG. 19 is a comparison graph of the difference of main stresses at the measuring point 2 under different loading amplitude steady-state operating conditions when the transmission is at the first gear position.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In the specific implementation: as shown in fig. 1, a gearbox housing deformation test system comprises a test bench device 1 and a measurement and control system 2, wherein the test bench device 1 comprises a base 11, an end connecting support 12 for fixing an input shaft end of a gearbox and a terminal support base 13 for supporting an output shaft end of the gearbox, and a gearbox 14 to be tested is mounted on the end connecting support 12 and the terminal support base 13 according to a real-vehicle mounting and positioning mode; a fixed locking mechanism 15 for fixedly locking an output shaft of the gearbox to be tested is arranged on one side, located on the output shaft of the gearbox 14 to be tested, of the base 11, and the output shaft of the gearbox 14 to be tested is fixedly connected to the fixed locking mechanism 15; a loader bracket 16 and a torque loading device 17 mounted on the loader bracket 16 are arranged on one side of the base 11, which is located on the input shaft of the gearbox 14 to be tested, and the output shaft of the torque loading device 17 is coaxially connected with the input shaft of the gearbox 14 to be tested; the measurement and control system 2 comprises a torque sensor 21 arranged on an output shaft of the torque loading device 17, a strain type sensor 22 adhered to a point to be measured of a shell of the gearbox 14 to be measured, a data acquisition system 23 and a computer 24, wherein the torque sensor 21 and the strain type sensor 22 are connected to the computer 24 through the data acquisition system 23; the computer 24 is further connected with a loading controller 25 for controlling the output torque of the torque loading device 17, and the loading controller 25 is connected to the torque loading device 17.
By adopting the system, the loading controller is controlled by the computer, the torque loading device is mainly controlled to load the torque on the input shaft of the gearbox to be measured according to a set value, the output shaft of the gearbox to be measured is locked by the fixed locking mechanism, so that the input shaft and the output shaft of the gearbox have relative torsional deformation, the stress condition of the bearing support of the shell is changed, the torque is applied to the shell of the gearbox to cause the deformation of the shell of the gearbox, the strain data of the shell can be detected by the strain sensor which is pasted on the shell of the gearbox to be measured, the strain data is input into the computer through the data acquisition system, and the main stress value is obtained by calculation, so that the measurement of the deformation of the shell of the gearbox is. The torque sensor is arranged on the output shaft of the torque loading device, so that a data acquisition system and a computer can acquire the real-time torque output by the torque loading device conveniently, the closed-loop control of the torque loading device can be realized, and the torque output precision is improved.
In practice, the loader support 16 is an elastic support with elasticity at the lower end.
Therefore, the torsion load of the torque loading device driven by the deformation of the sample when the torsion load is applied can be reduced, and the buffer and reset functions are achieved.
In implementation, the strain sensors 22 are respectively adhered to the outer edge of the rear bearing hole of the output shaft of the transmission case 14 to be tested, the outer edge of the rear bearing hole of the intermediate shaft, the load applying position of the rear shell bearing, the load applying position of the middle shell bearing and the outer side of the main case body.
Because the positions are generally positions where the stress of the gearbox is stressed in the actual driving process and the stress of finite element analysis is large, strain sensors are arranged at the positions, and more accurate measurement results can be obtained.
In practice, the torque loading device 17 is a hydraulic servo torsional actuator.
The hydraulic servo torsion actuator has the characteristics of high dynamic response precision, high load rigidity, high control power and the like. Accurate torque input can be realized by adopting the hydraulic servo torsion actuator, and the measurement accuracy is favorably improved.
In specific implementation, an angular displacement sensor is further arranged on an output shaft of the torque loading device 17. Therefore, the initial position of the transmission can be adjusted through angle control, and intermittence is eliminated, so that torque control is facilitated, and the measurement accuracy is improved.
During the test, the following steps are adopted: A. firstly, acquiring the gearbox shell deformation test system, mounting a gearbox to be tested on a test bench device 1 according to a real vehicle mounting and positioning mode, and locking and fixing an output shaft of the gearbox to be tested;
B. connecting an input shaft of a gearbox to be tested with an output shaft of a torque loading device, and arranging a torque sensor and an angular displacement sensor between the input shaft of the gearbox to be tested and the output shaft of the torque loading device, wherein the torque sensor and the angular displacement sensor are respectively used for detecting a rotation angle of the output shaft of the torque loading device and a torque applied to the input shaft of the gearbox to be tested;
C. selecting a point to be tested for shell deformation on a shell of the gearbox to be tested, and attaching a strain gauge or a strain pattern to the selected point to be tested;
D. the method comprises the steps that detection signals of a torque sensor and an angular displacement sensor are obtained in real time through a computer, the gearbox is connected into a forward gear or a reverse gear, a torque loading device is controlled in a closed-loop control mode to load an input shaft of the gearbox to be tested, during loading, the output torque of the torque loading device is gradually increased from zero to a torque set value within time t1 and is kept stable within time t2, and then the torque set value is gradually reduced to zero within time t 3;
E. and recording strain data of the strain gauge or the strain flower stuck on the point to be measured, and calculating to obtain a main stress value of the point to be measured through a stress-strain conversion formula.
By adopting the method, the gearbox is put into a forward or reverse gear, the input shaft of the gearbox is loaded through the torque loading device, the output shaft of the gearbox is fixed and locked, so that the input shaft and the output shaft of the gearbox have relative torsional deformation, the stress condition of the bearing support of the shell is changed, the torque acts on the shell of the gearbox to cause the deformation of the shell of the gearbox, the strain data of the shell of the gearbox is detected by adopting the strain gauge or the strain rosette, and the accurate main stress value can be obtained through a stress-strain conversion formula. The closed-loop control mode of the computer can ensure that the torque output by the torque loading device has higher precision, and is stable and reliable; the loading process of gradually increasing the torque from zero to a torque set value and gradually reducing the torque set value to zero can test the dynamic deformation process of the gearbox shell; the torque is kept at the set torque value, and the static deformation process of the gearbox shell can be tested. Therefore, the dynamic and static deformation processes of the gearbox shell can be tested, the actual constraint condition of the gearbox is approached, and the reliability and accuracy of the test are improved. The angular displacement sensor is arranged, the initial position of the speed changer can be adjusted through angle control, and intermittence is eliminated, so that torque control is facilitated, and the accuracy of measurement is improved.
In the step D, the transmission is respectively engaged into the 1 st gear, the 2 nd gear and the reverse gear, the input shaft of the transmission to be tested in different gears is loaded, the output torque of the torque loading device is gradually increased from zero to the same torque set value within the same time t1, the output torque is kept stable within the same time t2, and then the output torque is gradually decreased from the torque set value to zero within the same time t 3.
Because the speed ratio of 1 gear, 2 gear and reverse gear of the gearbox is large, the output rotating speed is low, and the torque is large, the torque, the meshing force and the stress of the shell transmitted by the gears of the 1 gear, 2 gear and R gear are large. By adopting the working condition loading method, the condition that the stress of the gearbox shell is larger in the actual running process can be simulated, and the efficiency and the accuracy of the test are improved.
In the step D, loading the input shaft of the transmission to be tested on the same gear by respectively adopting a plurality of different torque set values, and ensuring that t1, t2 and t3 are respectively and correspondingly equal in each loading process.
By adopting the method, the t1, the t2 and the t3 are respectively controlled to be correspondingly equal when the torque is set at different values, so that the slope of a torque loading curve can be changed due to different amplitudes in the same time t1 and the same time t3, and the dynamic deformation process of the shell in different dynamic loading processes can be tested. And different torque set values are kept stable within the same time t2, so that the deformation process of the gearbox shell under the loading condition of different static amplitudes can be tested. Therefore, the deformation conditions of the gearbox under the changes of steady-state loads with different amplitudes and dynamic loads with different slopes in the actual running process can be tested, and the efficiency and the accuracy of the test can be effectively improved.
Example (b): because the speed ratio of the first gear and the second gear of the gearbox is large, the output rotating speed is low, and the torque is large, the torque and the meshing force transmitted by the gears of the first gear, the second gear and the R gear are large in stress of the shell, and the stress conditions of the gearbox assembly under the action of the input torque of the gears of the 1 gear, the 2 gear and the R gear are mainly considered.
And (3) by adopting a loading mode of variable amplitude and variable slope, and comprehensively considering the dynamic and static deformation test process of the gearbox, in the test, on each gear of 1 gear, 2 gear and R gear, slowly loading the torque to 100Nm, 200Nm, 270Nm and 300Nm within 20s, keeping the stability for 20s, and slowly setting the torque to 0Nm from 100Nm, 200Nm, 270Nm and 300Nm within 20 s. When loading, gradually increasing or reducing the torque, can test the dynamic deformation process of gearbox casing. And the amplitude is stabilized for a period of time, so that the static deformation process of the gearbox shell can be tested. During the torque increase or decrease, the slope of the change in magnitude is different because the magnitude of the change in torque is different within 20s of equality. In this way, dynamic shell deformations during different dynamic loading processes can be measured. Stabilizing the torque on different amplitudes can measure the deformation process of the gearbox shell under the condition of loading different static amplitudes. The torque loading is as shown in fig. 2 to fig. 9, and it can be seen from the loading curve that the torque loading is stable and can be well zeroed, which shows that the test system has high loading precision and good repeatability.
When actual data is processed, firstly, the change condition of each group of data is observed, whether the data is normal or not and the repeatability is good or not are roughly observed, the strain data of each measuring point is calculated through a stress-strain conversion formula to obtain the main stress value of each measuring point, the difference value of the steady state data of 3 samples of each measuring point under each loading condition and the difference value of the steady state data before and after loading are calculated, and whether the strain sensor works normally and the repeatability of the test system are checked.
The conversion formula of the strain-stress of the triaxial Y-shaped equiangular strain rosette is as follows:
wherein,xandypositive strain in the x-axis and y-axis directions respectively,30、90and150positive strain, σ, in the directions of 30 °, 90 ° and 150 °, respectively1,σ2To measure principal stress, τmaxFor measuring maximum shear, gammaxyFor shear strain, E is the modulus of elasticity and ν is the Poisson's ratio. The stress-strain calculation formula of the uniaxial strain gauge is as follows:
σ＝E (7)
σ is stress, strain, E is elastic modulus
Now, taking the case that the transmission is at the first gear position, the strain-stress variation of the three-axis Y-shaped equiangular strain gauge at the measuring point 1 and the uniaxial strain gauge at the measuring point 2 is at the loading level of 200Nm as an example, the data processing results are shown in FIGS. 10 to 13.
After the installation and debugging are finished, a test is carried out, 3 strain samples of R gear, 1 gear and 2 gear of 5 measuring points are respectively collected, and a main stress value is calculated according to formulas (1) - (7). The test results are illustrated with the strain curve at point 2 at a 200Nm loading level of only one gear. As can be seen from the graphs in FIGS. 9 to 12, when the test is loaded, the test data stably rises, when the torque is stable, the main stress and strain of the test point basically keep unchanged, and after the stress and strain values are restored to the values before the test, the test data can be well zeroed, which indicates that the gearbox shell deformation test system has good repeatability.
Taking measuring point 1 and measuring point 2 as an example, fig. 14 is the principal stress values of measuring point 1 at 3 gears under the loading level of 300 Nm; FIG. 15 is the principal stress values for 3 gears at 300Nm loading level at test point 2; FIG. 16 shows the main stress values of the measuring point 1 under the steady-state working conditions of different loading amplitudes when the transmission case is at the first gear position; FIG. 17 shows the main stress values of the measuring point 2 under the steady-state working conditions of different loading amplitudes when the transmission case is at the first gear position; FIG. 18 is a comparison graph of the main stress difference values of the measuring point 1 under different loading amplitude steady-state conditions when the transmission case is at the first gear position; FIG. 19 is a comparison graph of the difference of main stresses at the measuring point 2 under different loading amplitude steady-state operating conditions when the transmission is at the first gear position.
As can be seen from FIGS. 14 and 15, under the steady-state 300Nm loading condition, the maximum stress values of the sample measuring point 1 and the measuring point 2 of the first gear, the second gear and the R gear are all smaller than the tensile strength value of the box material, and the strength requirement is met.
As can be seen from FIGS. 16 and 17, the stress values of the measuring point 1 and the measuring point 2 are different under different loading levels, the main stress value presents an increasing trend along with the increase of the loading level, and the main stress value is the largest at 300 Nm; as can be seen from FIGS. 18 and 19, under the same torque loading level, the stress difference value of each measuring point is stable, and gradually increases with the increase of the torque loading level, so that the method conforms to the actual situation, the repeatability of sample data is good, the stress difference of the measuring point 2 is large, and the stress value borne by the measuring point 2 is large. The initial stress value of S1 is different under different torque loading levels in part, mainly caused by residual stress existing in the strain gauge due to a slightly short test interval.
The analysis shows that the transmission shell deformation test system designed by the hydraulic servo system is simple in loading method, good in repeatability, high in precision and high in dynamic response characteristic. The variable slope and variable amplitude loading mode is adopted, the dynamic and static shell deformation processes of the gearbox are comprehensively considered, and the actual constraint condition of the gearbox is approached. The test result shows that the stress difference value of each measuring point is stable under the same torque loading level, and the stress difference value gradually increases along with the increase of the torque loading level, so that the method accords with the actual situation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The gearbox shell deformation test system is characterized by comprising a test bench device (1) and a measurement and control system (2), wherein the test bench device (1) comprises a base (11), an end connecting support (12) for fixing an input shaft end of a gearbox and a terminal supporting seat (13) for supporting an output shaft end of the gearbox, and the gearbox (14) to be tested is mounted on the end connecting support (12) and the terminal supporting seat (13) according to a real-vehicle mounting and positioning mode; a fixed locking mechanism (15) for fixedly locking an output shaft of the gearbox to be tested is arranged on one side, located on the output shaft of the gearbox to be tested (14), of the base (11), and the output shaft of the gearbox to be tested (14) is fixedly connected to the fixed locking mechanism (15); a loader support (16) and a torque loading device (17) installed on the loader support (16) are arranged on one side, located on an input shaft of the gearbox to be tested (14), of the base (11), and an output shaft of the torque loading device (17) is coaxially connected with the input shaft of the gearbox to be tested (14); the measurement and control system (2) comprises a torque sensor (21) arranged on an output shaft of the torque loading device (17), a strain gauge sensor (22) adhered to a point to be measured of a shell of a gearbox (14) to be measured, a data acquisition system (23) and a computer (24), wherein the torque sensor (21) and the strain gauge sensor (22) are connected to the computer (24) through the data acquisition system (23); the computer (24) is also connected with a loading controller (25) for controlling the output torque of the torque loading device (17), and the loading controller (25) is connected to the torque loading device (17).
2. The gearbox housing deformation testing system of claim 1, wherein the loader bracket (16) is an elastic bracket with elasticity at the lower end.
3. The gearbox housing deformation testing system of claim 1, wherein the strain gauge sensors (22) are respectively attached to the outer side edge of the output shaft rear bearing hole of the gearbox (14) to be tested, the outer side edge of the middle shaft rear bearing hole, the position of the rear shell bearing where a load is applied, the position of the middle shell bearing where a load is applied and the outer side of the main box.
4. The gearbox housing deformation testing system of claim 1, wherein the torque loading device (17) is a hydraulic servo torsion actuator.
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| CN201720304465.5U CN206593847U (en) | 2017-03-27 | 2017-03-27 | Gear box casing deformation test system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702917A (en) * | 2017-11-07 | 2018-02-16 | 中铁检验认证中心 | A kind of EMUs gear-box forms static test bed |
| CN109269913A (en) * | 2018-11-05 | 2019-01-25 | 安徽江淮汽车集团股份有限公司 | A kind of transmission assembly shell strain detection testing device |
| CN109738182A (en) * | 2019-01-22 | 2019-05-10 | 清研新能源汽车工程中心（襄阳）有限公司 | A kind of polytypic differential mechanism test fixed case |
| CN112393901A (en) * | 2020-11-27 | 2021-02-23 | 马鞍山市龙腾机电科技有限公司 | Gearbox shell performance detection equipment and detection method for stereoscopic parking space |
-
2017
- 2017-03-27 CN CN201720304465.5U patent/CN206593847U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702917A (en) * | 2017-11-07 | 2018-02-16 | 中铁检验认证中心 | A kind of EMUs gear-box forms static test bed |
| CN109269913A (en) * | 2018-11-05 | 2019-01-25 | 安徽江淮汽车集团股份有限公司 | A kind of transmission assembly shell strain detection testing device |
| CN109738182A (en) * | 2019-01-22 | 2019-05-10 | 清研新能源汽车工程中心（襄阳）有限公司 | A kind of polytypic differential mechanism test fixed case |
| CN112393901A (en) * | 2020-11-27 | 2021-02-23 | 马鞍山市龙腾机电科技有限公司 | Gearbox shell performance detection equipment and detection method for stereoscopic parking space |
| CN112393901B (en) * | 2020-11-27 | 2022-09-16 | 马鞍山市龙腾机电科技有限公司 | Gearbox shell performance detection equipment and detection method for stereoscopic parking space |
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