CN111929058B - Static torsion test device and method for through bridge driving cylindrical gear shaft - Google Patents
Static torsion test device and method for through bridge driving cylindrical gear shaft Download PDFInfo
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- CN111929058B CN111929058B CN202010633143.1A CN202010633143A CN111929058B CN 111929058 B CN111929058 B CN 111929058B CN 202010633143 A CN202010633143 A CN 202010633143A CN 111929058 B CN111929058 B CN 111929058B
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Abstract
The invention discloses a static torsion test device and a static torsion test method for a through bridge driving cylindrical gear shaft, which are developed aiming at two service working conditions and are used for the static torsion test research of shaft parts. The test device comprises a torque test sensor, a rotation angle sensor, a static torque driving motor device, a device torque output end, a test bed base, a driving cylindrical gear shaft input end spline connecting device, a rear axle output end spline connecting device, a middle axle output end spline connecting device and the like; the test method can simulate the static torque test function of the driving cylindrical gear shaft test piece under two working conditions of a normal driving state and a state requiring large torque output. The static torsion test device can realize static torsion tests of the through bridge driving cylindrical gear shaft under two different actual service working conditions, the tests are closer to the actual operation working conditions of the driving cylindrical gear shaft, and the static torsion test device can be suitable for static torsion test research of similar driving cylindrical gear shaft part products.
Description
The technical field is as follows:
the invention belongs to the field of commercial vehicle axle part tests, and particularly relates to a static torsion test device and a static torsion test method for a through axle driving cylindrical gear.
Background art:
the driving cylindrical gear shaft of the through axle of the commercial vehicle is a first part at the input end of the middle axle of the driving axle, has large bearing torque, fast rotation and bad service conditions, is a key part for transmitting the torque in a transmission system, and plays a key role in transmitting the power of an engine to each driving axle and finally to wheels; in the stage of product development and verification, a single-piece static torsion test is required to examine whether the torsion resistance meets the required working condition. The driving cylindrical gear shaft is generally divided into two working conditions according to the transmission principle and the structural design characteristics of parts, one is a normal driving state, namely a working condition mode that the middle axle is driven only through the spline of the middle axle output end of the driving cylindrical gear shaft, and the other is a working condition state requiring large torque output, namely the spline of the middle axle output end and the spline of the rear axle output end of the driving cylindrical gear shaft are required to work simultaneously when climbing or getting rid of trouble, so that the working condition mode that the middle axle and the rear axle are driven simultaneously is realized.
The existing test device is generally modified from a traditional half-shaft static torsion test device, and the test method is generally carried out by using a half-shaft test technology. For the complex part of the driving cylindrical gear shaft, the product failure mode of the complex part is related to the driving principle, the structural shape characteristics and the actual use working condition of the driving cylindrical gear shaft, but the prior art can only simulate the static torsion test function in the normal driving state, has single test condition, and cannot simulate the static torsion test function under the condition that the middle axle and the rear axle are driven simultaneously under working conditions of climbing, getting rid of difficulties and the like.
The invention researches the function of realizing the static torque test of the driving cylindrical gear shaft under the full-working-condition running condition, and the test device is put forward for the first time. The static torsion strength test device and the static torsion strength test method for the driving cylindrical gear shaft product can effectively realize static torsion strength test research of the through bridge driving cylindrical gear shaft under two different service working conditions, the examination result is closer to the driving cylindrical gear shaft transmission principle and the actual operation condition more truly, and the static torsion strength test device and the static torsion strength test method for the driving cylindrical gear shaft product can be suitable for the similar product structure and the similar product transmission principle.
The invention content is as follows:
the invention provides a static torsion test device and a static torsion test method for a through axle driving cylindrical gear shaft, aiming at the defects of the prior art, and the device and the method are used for the static torsion test research of the through axle driving cylindrical gear shaft of a commercial vehicle. In order to achieve the above purpose, the invention provides the following scheme:
the utility model provides a static test device that twists reverse of through bridge initiative cylindrical gear axle, includes: a torque and rotation angle sensor 1, a static torque driving motor device 2, a device torque output end 3, a driving cylindrical gear shaft input end spline connecting device 5, a rear axle output end spline connecting device 7 and a middle axle output end spline connecting device 10,
the torque and rotation angle sensor 1 is arranged on a static torque driving motor device (2) and is used for measuring a torque value applied to a test piece and measuring a rotation angle;
the static torque driving motor equipment 2 is connected with an equipment torque output end 3 to provide torque required by a static torque test, and the equipment torque output end 3 is arranged on a test bed base 4;
the spline connecting device 5 at the input end of the driving cylindrical gear shaft is fixedly connected with the rotating end face of the torque output end 3 of the device and is connected with a spline 12 at the input end of a test piece;
the middle bridge output end spline connecting device 10 is fixedly connected with a middle bridge supporting clamp group 11, and the middle bridge supporting clamp group 11 is installed on the test bed base 4;
the rear axle output end spline connecting device 7 is fixedly connected with a rear axle supporting clamp group connecting plate 8, and the rear axle supporting clamp group connecting plate 8 is installed on the test bed base 4 through a rear axle supporting clamp group bottom supporting plate 9;
furthermore, the driving cylindrical gear shaft input end spline connecting device 5, the rear axle output end spline connecting device 7 and the middle axle output end spline connecting device 10 are coaxially assembled, and generate a torsion restriction relation with the driving cylindrical gear shaft test piece 6 to form a torque, so that a static torsion test of the driving cylindrical gear shaft test piece is realized; the spline connecting device 5 at the input end of the driving cylindrical gear shaft is meshed with a spline 12 at the input end of a test piece through an inner hole spline; the middle bridge output end spline connecting device 10 is meshed with a middle bridge output end spline 13 of a test piece through an inner hole spline; the rear axle output spline connecting device 7 is meshed with a rear axle output end spline 14 through an inner hole spline test piece.
Furthermore, the fixed connection adopts fastening bolts which are correspondingly added according to the requirements; each device on the test bed base 4 can slide on the test bed base 4, adjust and fasten by bolts.
A test method adopting the static torsion test device for the through bridge driving cylindrical gear shaft comprises two test working conditions: the static torsion test is carried out under a middle axle driving working condition mode, and the static torsion test is carried out under a middle axle and rear axle simultaneously driving working condition mode;
under the working condition mode of the middle axle driving, the static torque driving motor device 2 drives the device torque output end 3 to rotate, and drives the driving cylindrical gear shaft test piece 6 to rotate through the driving cylindrical gear shaft input end spline 5; the middle bridge output end spline connecting device 10 is fixed on the test bed base 4 through a middle bridge supporting clamp group 11, and prevents the middle bridge output end of the driving cylindrical gear shaft test piece 6 from rotating; under the action of a test device, a static torsion test effect that one end is fixed and the other end rotates is formed, a torsion moment and a torsion angle are generated, and the whole process from elastic deformation to plastic yielding to damage and fracture of a test piece is recorded through a torque and rotation angle sensor 1; and completing the test process under the working condition mode of the middle axle drive, then automatically stopping the equipment, and acquiring the maximum value of the yield value and the data of the torsion angle by acquiring a torque-angle curve.
Under the working condition mode of simultaneously driving the middle axle and the rear axle, the static torque driving motor device 2 drives the device torque output end 3 to rotate, and drives the driving cylindrical gear shaft test piece 6 to rotate through the driving cylindrical gear shaft input end spline 5; the middle axle output end spline connecting device 10 is fixed on the test bed base 4 through a middle axle supporting clamp group 11, the rear axle output end spline connecting device 7 is fixed on the test bed base 4 through a rear axle supporting clamp group, and the middle axle and the rear axle output end of the driving cylindrical gear shaft test piece 6 are prevented from rotating together; under the action of a test device, a static torsion test effect that one end is fixed and the other end rotates is formed, a torsion moment and a torsion angle are generated, and the whole process from elastic deformation to plastic yielding to damage and fracture of a test piece is recorded through a torque and rotation angle sensor 1; and completing the test process under the working condition mode of the middle axle drive, then automatically stopping the equipment, and acquiring the maximum value of the yield value and the data of the torsion angle by acquiring a torque-angle curve.
The technical scheme of the invention at least comprises the following beneficial effects:
the test device and the test method can realize the static torsion test function of the driving cylindrical gear shaft under different operating conditions, test the static torsion test performance of the driving cylindrical gear shaft through the device, are more comprehensive, can provide test data analysis under real simulation conditions for designers and testers, and provide technical support for product improvement and process optimization. The test device can be popularized and applied in similar products.
Description of the drawings:
FIG. 1 is a connection diagram of a static torsion test device under a medium axle driving working condition mode (i.e. normal driving working condition) according to the invention
FIG. 2 is a connection diagram of a static torque test device under a working condition mode (i.e. climbing or getting rid of difficulties and other working conditions requiring large torque) in which a middle axle and a rear axle are driven simultaneously
FIG. 3 is an axial exploded view of the device of the present invention;
FIG. 4 is a schematic diagram of a static torsion test under a mode of a medium axle driving condition (i.e., a normal driving condition) according to the present invention;
FIG. 5 is a schematic diagram of a static torque test in a working condition mode in which the middle axle and the rear axle are driven simultaneously (i.e., a working condition requiring a large torque such as climbing or getting rid of difficulties);
FIG. 6a is a front view of the spline connection device for the input end of the driving cylindrical gear shaft according to the present invention;
FIG. 6b is a left side sectional view of FIG. 6 a;
FIG. 7a is a front view of a rear axle output spline coupler of the present invention;
FIG. 7b is a right side sectional view of FIG. 7 a;
FIG. 8b is a front view of a connection plate of the rear axle supporting clamp group of the present invention;
FIG. 8a is a right sectional view of FIG. 8 b;
FIG. 9b is a front view of a bottom support plate of the rear axle support clamp assembly of the present invention;
FIG. 9a is a right side view of FIG. 9 b;
FIG. 10b is a front view of the spline connection device for the output end of the intermediate axle according to the present invention;
FIG. 10a is a right side cross-sectional view of FIG. 10 b;
FIG. 11b is a front view of the center bridge support clamp assembly of the present invention;
FIG. 11a is a right side view of FIG. 11 b;
wherein: 1. torque and rotation angle sensors; 2. a static torque drive motor apparatus; 3. an equipment torque output end; 4. a test stand base; 5. the input end of the driving cylindrical gear shaft is provided with a spline connecting device; 6. a driving cylindrical gear shaft test piece; 7. the output end of the rear axle is provided with a spline connecting device; 8. the rear axle supports the clamp group connection plate; 9. a rear axle supporting clamp group bottom supporting plate; 10. the output end of the middle bridge is provided with a spline connecting device; 11. a middle bridge supporting clamp group; 12. a spline at the input end of the test piece; 13. a spline at the output end of a middle bridge of the test piece; 14. spline at the output end of the test piece rear axle.
Detailed description of the preferred embodiments
To make the technical problems, technical solutions and advantages of the present invention more clear, the technical solutions and advantages of the present invention are further described below in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, a connection diagram of a static torsion test device under a normal driving condition in a medium bridge driving condition mode includes a torque and rotation angle sensor 1, a static torsion driving motor device 2, a device torque output end 3, a test bed base 4, a driving cylindrical gear shaft input end spline connection device 5, a medium bridge output end spline connection device 10 and a medium bridge support clamp group 11.
Further, quiet power drive motor equipment 2 links to each other with equipment torque output 3, and according to the experimental demand of quiet power that the user provided, quiet power drive motor equipment and equipment torque output are the nonstandard equipment of equipment factory design production according to experimental standard, and according to the general experimental requirement in the trade, equipment torque specification can be divided into two kinds 6 ten thousand niu meters and 10 ten thousand niu meters. The specification of the device used by the invention is 10 ten thousand Newton meters, namely, the device can be used for carrying out static torque test research on the driving cylindrical gear shaft as long as the rated torque reaches 10 ten thousand Newton meters.
Further, the torque and rotation angle sensor 1 can measure the torque value applied to the test piece 6 and measure the rotation angle, so that a torque-angle test curve is formed in a computer, the maximum value of the yield value of the static torsion test and the torsion angle data are obtained, and the static torsion test condition of the test piece is provided for product designers and test researchers, so that subsequent data analysis and product improvement are facilitated.
Furthermore, a side end face of the driving cylindrical gear shaft input end spline connecting device 5 is connected with a rotating end face of the equipment torque output end 3 through a bolt, the other end of the driving cylindrical gear shaft input end spline connecting device is connected with a test piece input end spline, and the driving cylindrical gear shaft test piece 6 can be driven to rotate.
Further, after the static torque driving motor device 2 is connected with the device torque output end 3, the static torque driving motor device is in plane connection with the test bed base 4 through a bottom plate below the device torque output end and is locked and fixed through bolts.
Furthermore, one side end face of the spline connecting device 10 at the output end of the middle bridge is connected with the middle bridge supporting clamp group 11 through a bolt, and the middle bridge supporting clamp group is connected and fixed with the test bed base 4 through a bolt on the bottom plate bottom surface below.
Furthermore, the driving cylindrical gear shaft input end spline connecting device 5 and the middle bridge output end spline connecting device 10 are coaxial and generate a torsion restriction relation with the driving cylindrical gear shaft test piece 6 to form a torque, so that a static torsion test function of the driving cylindrical gear shaft test piece is realized.
Referring to fig. 2, the middle axle and the rear axle simultaneously drive the working condition mode, namely, the connection diagram of the static torsion test device under the working condition of needing large torque, such as climbing or getting rid of trouble, and the like, wherein the device further comprises a rear axle output end spline connection device 7, a rear axle support clamp group connection plate 8 and a rear axle support clamp group bottom support plate 9.
Further, a side end face of the rear axle output end spline connecting device 7 is connected with a rear axle supporting clamp group connecting plate 8, the rear axle supporting clamp group connecting plate 8 is connected with a rear axle supporting clamp group bottom face supporting plate 9 through a bolt, and the rear axle supporting clamp group supporting plate 9 is connected and fixed with the test bed base 4 through a bottom plate bottom face below.
Furthermore, the driving cylindrical gear shaft input end spline connecting device 5, the rear axle output end spline connecting device 7 and the middle axle output end spline connecting device 10 are coaxial, and generate a twisting restriction relation with the driving cylindrical gear shaft test piece 6 to form a torque, so that a static twisting test function of the driving cylindrical gear shaft test piece is realized.
Referring to fig. 3, an axial explosion diagram of a static torsion test device for a through axle driving cylindrical gear shaft comprises a torque and rotation angle sensor 1, a static torsion driving motor device 2, a device torque output end 3, a test bed base 4, a spline connecting device 5 for a driving cylindrical gear shaft input end, a spline connecting device 7 for a rear axle output end, a connecting plate 8 for a rear axle supporting clamp group, a bottom supporting plate 9 for the rear axle supporting clamp group, a spline connecting device 10 for a middle axle output end and a middle axle supporting clamp group 11; the fastening bolt for the test device can be correspondingly added as required, and each device on the test bed base 4 can be slidably adjusted and fastened on the test bed base 4, so that the test device has the advantages of universality and flexible adjustment.
Referring to fig. 4, a static torsion test schematic diagram of a normal driving condition in a middle axle driving condition mode, wherein the axes of the driving cylindrical gear shaft input end spline connecting device 5 and the middle axle output end spline connecting device 10 are collinear, and generate a torsion relationship with the driving cylindrical gear shaft test piece 6 to transmit torque, so as to realize the static torsion test function of the driving cylindrical gear shaft test piece; the driving cylindrical gear shaft input end spline connecting device 5 is meshed with a test piece input end spline 12 through an inner hole spline, and the middle bridge output end spline connecting device 10 is meshed with a test piece middle bridge output end spline 13 through an inner hole spline.
Referring to fig. 5, a static torque test schematic diagram of a working condition requiring large torque, such as climbing or getting rid of difficulty, is shown in a working condition mode in which the middle axle and the rear axle are driven simultaneously, wherein the axle centers of the driving cylindrical gear shaft input end spline connecting device 5, the rear axle output end spline connecting device 7 and the middle axle output end spline connecting device 10 are collinear, and generate a torsion relationship with the driving cylindrical gear shaft test piece 6 to transfer torque, so that a static torque test function of the driving cylindrical gear shaft test piece is realized; wherein the spline connecting device 5 at the input end of the driving cylindrical gear shaft is meshed with a spline 12 at the input end of a test piece through an inner hole spline; the middle bridge output end spline connecting device 10 is meshed with a middle bridge output end spline 13 of a test piece through an inner hole spline; meanwhile, the rear axle output spline connecting device 7 is meshed through the rear axle output end spline 14 of the inner hole spline test piece.
Referring to fig. 6a and 6b, a front view and a left side sectional view of the spline connection device at the input end of the driving cylindrical gear shaft are shown.
Referring to fig. 7a and 7b, a front view and a right side sectional view of the spline connection device at the output end of the rear axle are shown.
Referring to fig. 8b and 8a, the rear axle supporting clamp group connecting plate is shown in front view and right side cross-sectional view.
Referring to fig. 9b and 9a, the rear axle supporting clamp group bottom supporting plate is seen from the front and right.
Referring to fig. 10b and 10a, a front view and a right side view of the middle bridge output end spline connection device are shown.
Referring to fig. 11b and 11a, the middle bridge support jig set is seen from the front and right.
The test method and the test process of the invention are as follows:
referring to fig. 1 and 4, a connection scheme and a test principle of a static torque test under a middle axle driving working condition mode, namely a normal driving working condition;
the method comprises the following steps: after the device is installed, a static torque driving motor is started to automatically and continuously and slowly load, stepless speed regulation is performed within the range of the torsion speed of 0.01-1000 degrees/min, the test is started, a static torque driving motor device 2 drives a device torque output end 3 to rotate, and a driving cylindrical gear shaft test piece 6 is driven to rotate through a spline 5 at the input end of a driving cylindrical gear shaft; the middle bridge output end spline connecting device 10 is fixed on the test bed base 4 through a middle bridge supporting clamp group 11, and prevents the middle bridge output end of the driving cylindrical gear shaft test piece 6 from rotating; under the action of the test device, a static torsion test effect that one end is fixed and the other end rotates is formed, a torsion moment and a torsion angle are generated, and the whole process from elastic deformation to plastic yield to damage and fracture of a test piece is recorded through the torque and rotation angle sensor 1.
Step two: and (3) completing the test process under the working condition mode of the middle axle drive, then automatically stopping the equipment, and acquiring the maximum value of the yield value and the data of the torsion angle by acquiring a torque-angle curve.
Referring to fig. 2 and 5, the connection scheme and the test principle of the static torque test requiring the large torque working condition, such as climbing or getting rid of difficulty, are adopted in the working condition mode of driving the middle axle and the rear axle simultaneously.
The method comprises the following steps: after the device is installed, a static torque driving motor is started to automatically and continuously and slowly load, stepless speed regulation is performed within the range of the torsion speed of 0.01-1000 degrees/min, the test is started, a static torque driving motor device 2 drives a device torque output end 3 to rotate, and a driving cylindrical gear shaft test piece 6 is driven to rotate through a spline 5 at the input end of a driving cylindrical gear shaft; the middle axle output end spline connecting device 10 is fixed on the test bed base 4 through a middle axle supporting clamp group 11, the rear axle output end spline connecting device 7 is fixed on the test bed base 4 through a rear axle supporting clamp group, and the middle axle and the rear axle output end of the driving cylindrical gear shaft test piece 6 are prevented from rotating together; under the action of the test device, a static torsion test effect that one end is fixed and the other end rotates is formed, a torsion moment and a torsion angle are generated, and the whole process from elastic deformation to plastic yielding to damage and fracture of a test piece is recorded through the torque and rotation angle sensor 1.
Step two: and (3) completing the test process under the working condition mode of the middle axle drive, then automatically stopping the equipment, and acquiring the maximum value of the yield value and the data of the torsion angle by acquiring a torque-angle curve.
While the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the principles of the invention as set forth in the appended claims.
Claims (3)
1. The utility model provides a link up quiet test device of turning round of bridge initiative cylindrical gear axle which characterized in that includes: the device comprises a torque and rotation angle sensor (1), a static torque driving motor device (2), a device torque output end (3), a driving cylindrical gear shaft input end spline connecting device (5), a rear axle output end spline connecting device (7) and a middle axle output end spline connecting device (10);
the torque and rotation angle sensor (1) is arranged on the static torque driving motor device (2) and is used for measuring a torque value applied to a test piece and measuring a rotation angle;
the static torque driving motor equipment (2) is connected with an equipment torque output end (3) to provide torque required by a static torque test, and the equipment torque output end (3) is arranged on a test bed base (4);
the driving cylindrical gear shaft input end spline connecting device (5) is fixedly connected with the rotating end face of the equipment torque output end (3) and is connected with a test piece input end spline (12);
the middle bridge output end spline connecting device (10) is fixedly connected with a middle bridge supporting clamp group (11), and the middle bridge supporting clamp group (11) is installed on the test bed base (4);
the rear axle output end spline connecting device (7) is fixedly connected with a rear axle supporting clamp group connecting plate (8), and the rear axle supporting clamp group connecting plate (8) is installed on the test bed base (4) through a rear axle supporting clamp group bottom supporting plate (9);
the driving cylindrical gear shaft input end spline connecting device (5), the rear axle output end spline connecting device (7) and the middle axle output end spline connecting device (10) are coaxially assembled, and generate a torsion restriction relation with the driving cylindrical gear shaft test piece (6) to form a torque, so that a static torsion test of the driving cylindrical gear shaft test piece is realized; the driving cylindrical gear shaft input end spline connecting device (5) is meshed with a test piece input end spline (12) through an inner hole spline; the middle bridge output end spline connecting device (10) is meshed with a middle bridge output end spline (13) of a test piece through an inner hole spline; the rear axle output end spline connecting device (7) is meshed with a rear axle output end spline (14) through an inner hole spline test piece;
the fixed connection adopts a fastening bolt which is correspondingly added according to the requirement; each device on test bench base (4) all can slide adjustment and adopt the bolt-up on test bench base (4).
2. A test method adopting the through bridge driving cylindrical gear shaft static torsion test device as claimed in claim 1 comprises two test working conditions: the static torsion test is carried out under a middle axle driving working condition mode, and the static torsion test is carried out under a middle axle and rear axle simultaneously driving working condition mode, under the middle axle driving working condition mode, the static torsion driving motor equipment (2) drives an equipment torque output end (3) to rotate, and a driving cylindrical gear shaft test piece (6) is driven to rotate through a driving cylindrical gear shaft input end spline connecting device (5); the middle bridge output end spline connecting device (10) is fixed on the test bed base (4) through a middle bridge supporting clamp group (11) to prevent the middle bridge output end of the driving cylindrical gear shaft test piece (6) from rotating; under the action of a test device, a static torsion test effect that one end is fixed and the other end rotates is formed, a torsion moment and a torsion angle are generated, and the whole process from elastic deformation to plastic yielding to damage and fracture of a test piece is recorded through a torque and rotation angle sensor (1); and (3) completing the test process under the working condition mode of the middle axle drive, then automatically stopping the equipment, and acquiring the maximum value of the yield value and the data of the torsion angle by acquiring a torque-angle curve.
3. A test method according to claim 2, characterized in that in the working condition mode of simultaneous driving of the middle axle and the rear axle, the static torque driving motor device (2) drives the device torque output end (3) to rotate, and drives the driving cylindrical gear shaft test piece (6) to rotate through the spline connection device (5) at the input end of the driving cylindrical gear shaft; the middle axle output end spline connecting device (10) is fixed on the test bed base (4) through a middle axle supporting clamp group (11), the rear axle output end spline connecting device (7) is fixed on the test bed base (4) through a rear axle supporting clamp group, and the middle axle and the rear axle output end of the driving cylindrical gear shaft test piece (6) are prevented from rotating together; under the action of a test device, a static torsion test effect that one end is fixed and the other end rotates is formed, a torsion moment and a torsion angle are generated, and the whole process from elastic deformation to plastic yield to damage and fracture of a test piece is recorded through a torque and rotation angle sensor (1); and (3) completing the test process of the middle axle and the rear axle in a working condition mode of driving simultaneously, then automatically stopping the equipment, and acquiring the maximum value of the yield value and the data of the torsion angle by acquiring a torque-angle curve.
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| CN202010633143.1A CN111929058B (en) | 2020-07-02 | 2020-07-02 | Static torsion test device and method for through bridge driving cylindrical gear shaft |
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| CN202010633143.1A CN111929058B (en) | 2020-07-02 | 2020-07-02 | Static torsion test device and method for through bridge driving cylindrical gear shaft |
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| CN114112383A (en) * | 2021-10-19 | 2022-03-01 | 重庆青山工业有限责任公司 | Static torsion strength test bench for speed changer |
| CN114414240B (en) * | 2022-01-24 | 2024-01-16 | 一汽解放汽车有限公司 | Test bench and test method for inter-axle differential mechanism |
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