Comprehensive test bench for contact spot and transmission error of transmission assembly

Abstract

The present invention provides a contact spot and transmission error comprehensive test bench for a transmission assembly, the test bench integrates the functions of contact spot test and transmission error test, avoids the need to make two test benches, and improves the test efficiency; at the same time, the contact spot test is performed in advance before the transmission error test, ensuring that the transmission error measurement value is untrue or inaccurate due to a bad contact state. The test bench includes a bench body, an angle misalignment adjustment component, a drive component and a loading component, wherein the drive component is connected to the input shaft of the transmission test piece, and the loading component is connected to the output shaft of the transmission test piece; the angle misalignment adjustment component has a gear meshing misalignment simulation function, which can realize the measurement of the transmission error of a single pair of gears under the condition of misalignment.

Description

Technical Field

[0001] The invention relates to a test bench, in particular to a contact spot and transmission error comprehensive test bench for a transmission assembly. Background Art

[0002] Currently, when conducting contact spot tests and transmission error tests on transmission assemblies, two tests need to be carried out respectively on two test benches, and the test piece needs to be reinstalled for each test, which makes the test efficiency low; and the transmission error test is usually done directly, and the poor contact state of the gears in the transmission assembly will lead to untrue or inaccurate transmission error measurement values. Summary of the invention

[0003] In view of this, the present invention provides a contact spot and transmission error comprehensive test bench for a transmission assembly, which integrates the functions of a contact spot test and a transmission error test, avoids the need to make two test benches, and improves test efficiency.

[0004] The contact spot and transmission error comprehensive test bench for the transmission assembly comprises: a bench body and a driving assembly and a loading assembly mounted on the bench body;

[0005] The driving assembly includes: a driving motor, a driving end reducer and a driving spindle box assembly; the output end of the driving motor is connected to one end of the driving spindle in the driving spindle box assembly through the driving end reducer, and a driving end torque sensor is arranged on the shaft system between the driving end reducer and the driving spindle box assembly; the other end of the driving spindle in the driving spindle box assembly is connected to the input shaft of the transmission test piece; an angle measurement module is installed on the driving spindle;

[0006] The loading component includes: a loading motor, a loading end reducer and a loading spindle box assembly; the output end of the loading motor is connected to one end of a loading spindle in the loading spindle box assembly through the loading end reducer; a loading end torque sensor is arranged on the shaft system between the loading end reducer and the loading spindle box assembly; the other end of the loading spindle in the loading spindle box assembly is connected to the output shaft of the transmission test piece, and an angle measurement module is installed on the loading spindle.

[0007] As a preferred embodiment of the present invention, it also includes: a driving slide, and the driving component is installed on the platform through the driving slide; the axial direction of the driving component is longitudinal, and the direction perpendicular to the longitudinal direction on the support surface of the platform is transverse; the driving slide is installed on the platform through a transverse guide rail, and the driving slide can move transversely on the platform along the transverse guide rail.

[0008] As a preferred embodiment of the present invention, it also includes: a loading slide; the loading assembly is installed on the platform through the loading slide; the axial direction of the driving assembly is longitudinal, and the direction perpendicular to the longitudinal direction on the support surface of the platform is transverse; the loading slide is installed on the platform through a longitudinal guide rail, and the loading slide can move longitudinally on the platform along the longitudinal guide rail.

[0009] As a preferred embodiment of the present invention, it further comprises: an angle misalignment adjustment component; the angle misalignment adjustment component comprises: a deflection slide plate, a rotation axis and an angle misalignment adjustment mechanism; the driving slide plate is mounted on the deflection slide plate through a transverse guide rail, the deflection slide plate is vertically fixed on the platform through the rotation axis, and the deflection slide plate can rotate around the rotation axis on the platform under the action of the angle misalignment adjustment mechanism;

[0010] The two gears in staggered meshing are gear A and gear B, wherein gear A is mounted on the platform, and gear B is mounted on the deflection slide. The deflection slide drives gear B to rotate, thereby changing the angle between the axes of gear A and gear B.

[0011] Beneficial effects:

[0012] (1) The test bench integrates the functions of the transmission assembly contact spot test and the transmission error test. Both the contact spot test and the transmission error test can be performed on one test bench, avoiding the need to have two test benches and improving the test efficiency.

[0013] (2) Performing a contact spot test before the transfer error test can effectively avoid the situation where the transfer error measurement value is untrue or inaccurate due to poor contact conditions.

[0014] (3) The angle misalignment adjustment mechanism and the deflection slide have the function of simulating the gear meshing misalignment, which can realize the measurement of the transmission error of a single pair of gears under the condition of misalignment caused by manufacturing, assembly or load deformation, making the transmission error test condition of the transmission gear system closer to the actual situation.

[0015] (4) Both the driving motor and the loading motor are motors with zero-speed load starting function. By controlling their operation, the test bench has low-speed stable operation performance, which can realize the contact spot test of the transmission test piece (the transmission assembly to be tested) under specific load conditions. Therefore, the test bench can be loaded under the specified load torque condition before the speed is started, so that the gear meshing contact state forms a corresponding relationship with the load, thereby truly reflecting the meshing contact state of the gears of the transmission test piece under different loads.

[0016] (5) Both the drive-end coupling and the loading-end coupling use double-diaphragm elastic couplings, which have a certain error compensation effect in the axial and tipping directions, avoiding the impact on the measurement results when the coaxiality of the shaft systems at both ends is not very good, thereby ensuring the measurement accuracy.

[0017] (6) The angle measurement module is installed at the non-loaded end of the shaft head, close to the side of the transmission test piece, which can avoid the error introduced by the shaft load deformation affecting the transmission error measurement result.

[0018] (7) The driving slide has a lateral position adjustment function, which can adapt to the installation of transmission test pieces with different center distances.

[0019] (8) The loading slide has the function of longitudinal position adjustment, which can adapt to the installation of transmission test pieces of different lengths and sizes.

[0020] (9) The spindle box assembly achieves the design goals of high rigidity and high coaxiality through the bearing combination, ensuring high-precision connection between the input and output of the transmission test piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the test bench in Example 1;

[0022] Figure 2 It is a structural schematic diagram of the driving spindle box assembly;

[0023] Figure 3 It is a schematic diagram of the structure of the test bench in Example 2;

[0024] Figure 4 It is a structural schematic diagram of the angle misalignment adjustment mechanism.

[0025] Among them: 1-driving motor, 2-driving end reducer, 3-driving reducer support, 4-driving end torque sensor, 5-driving end coupling, 6-driving spindle box assembly, 7-test piece support, 8-transmission test piece, 9-loading spindle box assembly, 10-loading end coupling, 11-loading end torque sensor, 12-loading reducer support, 13-loading end reducer, 14-loading motor, 15-loading motor support, 16-loading slide plate, 17-table, 18-loading torque sensor bracket, 19-driving torque sensor bracket, 20-driving slide plate, 21-driving motor support, 22-deflection slide plate, 23-angle misalignment adjustment mechanism, 24-driving spindle, 25-driving spindle box, 26-angle measurement module, 27-trapezoidal screw, 28-fixed nut seat, 29-connecting shaft, 30-pin shaft, 31-moving nut seat. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] Embodiment 1:

[0028] This embodiment provides a high-precision transmission assembly contact spot and transmission error comprehensive test bench capable of performing both contact spot test and transmission error test.

[0029] like Figure 1 As shown, the test bench comprises: a platform 17, a driving assembly and a loading assembly, wherein the platform 17 serves as a support platform for deflecting a slide plate 22, an angle misalignment adjustment mechanism 23, and bearing the driving assembly and the loading assembly.

[0030] The driving assembly includes: a driving motor 1, a driving end reducer 2, a driving spindle box assembly 6 and a driving slide 20. The axial direction of the driving assembly is defined as the longitudinal direction, and the direction perpendicular to the longitudinal direction on the support surface of the table 17 is defined as the transverse direction. The driving slide 20 is installed on the table 17 through a transverse guide rail, and the driving slide 20 can move transversely on the table 17 along the transverse guide rail, so that the driving assembly has a transverse position adjustment function, thereby adapting to the installation of transmission test pieces with different center distances (i.e., the transverse distance between the input shaft and the output shaft when the input shaft and the output shaft of the transmission test piece are not coaxial). The driving motor 1 is fixed on the driving slide 20 through the driving motor support 21, and the output end of the driving motor 1 is coaxially connected with the input end of the driving end reducer 2; the driving end reducer 2 is fixedly installed on the driving slide 20 through the driving reducer support 3, and the output end of the driving end reducer 2 is connected to the driving spindle box assembly 6 through the shaft system provided with the driving end torque sensor 4, specifically: the output end of the driving end reducer 2 is connected to one end of the driving end torque sensor 4 through a flange, the driving end torque sensor 4 is supported on the driving slide 20 through the driving torque sensor bracket 19, and the other end of the driving end torque sensor 4 is connected to one end of the driving end coupling 5 through a flange, the other end of the driving end coupling 5 is connected to one end of the driving spindle box assembly 6, and the other end of the driving spindle box assembly 6 is connected to the input shaft of the transmission test piece 8 through a transmission shaft. The driving spindle box assembly 6 is supported on the driving slide 20, and the transmission test piece 8 is fixedly installed on the test piece support 7 through an adapter connection plate, and the test piece support 7 is fixed on the driving slide 20. The test piece support 7 adopts an L-shaped structure with a simple structure. Its vertical surface serves as the connecting end surface of the transmission test piece 8. When in use, it is only necessary to ensure the verticality of the test piece support 7 and the flatness of the bottom surface of the test piece support 7.

[0031] The loading assembly includes: a loading motor 14, a loading end reducer 13, a loading slide 16 and a loading spindle box assembly 9. The loading slide 16 is installed on the table 17 through a longitudinal guide rail, that is, the loading slide 16 can move longitudinally on the table 17 along the longitudinal guide rail, so that the loading slide 17 has a longitudinal position adjustment function, so that it can adapt to the installation of transmission test pieces of different length specifications. The loading motor 14 is fixedly installed on the loading slide 16 through the loading motor support 15, and the output end of the loading motor 14 is coaxially connected to the input end of the loading end reducer 13; the loading end reducer 13 is fixedly installed on the loading slide 16 through the loading reducer support 12. The output end of the loading-end reducer 13 is connected to the loading spindle box assembly 9 through a shaft system provided with a loading-end torque sensor 11. Specifically, the output end of the loading-end reducer 13 is connected to one end of the loading-end torque sensor 11 through a flange, the other end of the loading-end torque sensor 11 is connected to one end of the loading-end coupling 10 through a flange, the other end of the loading-end coupling 10 is coaxially connected to one end of the loading spindle box assembly 9, and the other end of the loading spindle box assembly 9 is connected to the output shaft of the transmission test piece 8 through a transmission shaft.

[0032] The structure of the driving spindle box assembly 6 is as follows: Figure 2 As shown, it includes: a driving spindle 24, a driving spindle housing 25 and an angle measurement module 26; wherein the driving spindle housing 25 is fixedly mounted on the driving slide 20, and the driving spindle 24 and the driving spindle housing 25 are assembled and mounted by a bearing seal, that is, mounting holes for the driving spindle 24 are arranged on both longitudinal end faces of the driving spindle housing 25, and the driving spindle 24 passes through the mounting holes on the two end faces, and is supported on the driving spindle housing 25 by bearings at the mounting holes, and then sealed at the two mounting holes. After the driving spindle 24 passes through the two mounting holes on the driving spindle housing 25, one end is connected to the driving end coupling 5, and the other end is connected to the input shaft of the transmission test piece 8, and the angle measurement module 26 is installed at the connection end (the end is the non-loading end) between the driving spindle 24 and the input shaft of the transmission test piece 8, for real-time measurement of the rotation angle of the input shaft of the transmission test piece 8.

[0033] The structure of the loading spindle box assembly 9 is the same as that of the driving spindle box assembly 6, including: a loading spindle and a loading spindle box body; wherein the loading spindle and the loading spindle box body are installed through a bearing seal combination, and an angle measurement module 26 is installed at the connecting end of the loading spindle and the output shaft of the transmission test piece 8 (this end is the non-loading end) for real-time measurement of the rotation angle of the output shaft of the transmission test piece 8.

[0034] Among the above-mentioned components, the driving motor 1 and the loading motor 14 are both high-performance motors with zero-speed load starting function, and have low-speed stable operation performance, which can realize the contact spot test of the transmission test piece 8 under specific load conditions. The test bench can be loaded under the specified load torque condition before the speed is started, so that the gear meshing contact state forms a corresponding relationship with the load.

[0035] The driving end reducer 2 and the loading end reducer 13 both adopt high-precision and low-backlash products; the driving end coupling 5 and the loading end coupling 10 both adopt double-diaphragm elastic couplings.

[0036] The driving spindle box assembly 6 and the loading spindle box assembly 9 have the same outer dimensions, so as to avoid the influence of different rigidities on the transmission error measurement results.

[0037] The working principle of the test bench is:

[0038] When the contact spot test is performed on the transmission test piece 8: a pair of mutually meshing gears in the transmission test piece 8 is taken as a test gear pair, and the contact spot test is used to obtain the position and shape of the contact spot when the test gear pair is meshing.

[0039] The torque value measured by the torque sensor at the drive end (where the drive component is located), the speed measured by the encoder of the drive motor, the torque value measured by the torque sensor at the loading end (where the loading component is located), and the speed measured by the encoder of the loading motor can all be used as the control benchmark of the test. Taking the torque value measured by the torque sensor at the drive end (where the drive component is located) as the control benchmark as an example,

[0040] Before the test, paint is applied to the meshing surface of the test gear pair; when conducting the contact spot test, the drive motor and the loading motor are started, and the torque and speed of the drive end are monitored in real time (initially, the speed is zero). When the torque value measured by the torque sensor at the drive end is the set value; the speed of the drive motor starts to rise, and the speed value is monitored. When the motor speed reaches the set value, the system continues to run for the set time.

[0041] After running for a set time, stop working, open the transmission test piece 8, observe the meshing area of ​​the test gear pair (during system operation, the paint at the contact point position of the test gear pair is worn away), and obtain the position and shape of the contact spot of the test gear pair.

[0042] When performing a transmission error test on the transmission test piece 8:

[0043] After completing the above-mentioned contact spot test, if the contact state of the test gear pair is good (that is, the position and shape of the contact spot of the test gear pair meet the set requirements), the transmission test piece 8 is subjected to a transmission error test; if the contact state of the test gear pair does not meet the set requirements, the contact state of the test gear pair is adjusted first, until the contact state of the test gear pair is good after the contact spot test, and then the transmission error test is performed, thereby avoiding the transmission error measurement value being untrue or inaccurate due to the poor contact state of the gears in the transmission assembly.

[0044] When the transmission error test is carried out on the transmission test piece 8, the driving motor and the loading motor are started, and the test is started when the speed and torque of the driving end reach the set values; when the driving end rotates the set number of circles and returns to the initial position, the position of the loading end at this time is recorded, and the angular difference between the driving end and the loading end (that is, the difference between the input shaft angle of the transmission test piece 8 measured by the angle measurement module in the driving spindle box assembly 6 and the output shaft angle of the transmission test piece 8 measured by the angle measurement module in the loading spindle box assembly 9) is the transmission error of the transmission assembly.

[0045] Embodiment 2:

[0046] When a pair of involute gears of ideal shape and infinite stiffness are meshed, the rotation angle of the driven gear will be strictly consistent with the driving gear according to the speed ratio of the two. However, in fact, due to the existence of errors such as gear manufacturing errors, assembly errors, load deformation of the transmission system and load deformation of the gear teeth, the rotation angle of the driven gear will advance or lag its theoretical rotation angle position at different times, that is, the gear transmission error. When conducting the transmission error test, in order to be closer to the actual working conditions of the gear, on the basis of the above-mentioned embodiment 1, an angle misalignment adjustment component is further added to the test bench for the transmission error test of the transmission test piece 8 with a misaligned meshing gear pair.

[0047] like Figure 3 As shown, the angle misalignment adjustment assembly includes: a deflection slide 22, a rotary shaft and an angle misalignment adjustment mechanism 23; the axial direction of the output shaft of the driving motor 1 is longitudinal, and the rotary shaft and the angle misalignment adjustment mechanism 23 are installed at both longitudinal ends of the deflection slide 22, wherein the deflection slide 22 is vertically fixed on the platform 17 through the rotary shaft, and the deflection slide 22 can rotate around the rotary shaft on the platform 17 under the action of the angle misalignment adjustment mechanism 23. The driving slide 20 is installed on the deflection slide 22 through a transverse guide rail.

[0048] When a pair of gears in the transmission test piece 8 are misaligned and meshed, one of the gears (let it be gear A) is installed on the table 17, and the other gear (let it be gear B) is fixed on the deflection slide 22. The deflection slide 22 drives the gear installed thereon to rotate, and the angle between the axes of the two meshing gears is changed to achieve misaligned fitting of the gears.

[0049] The angle misalignment adjustment mechanism 23 is a differential screw mechanism, such as Figure 4 As shown, it includes: a trapezoidal screw 27, a fixed nut seat 28, a connecting shaft 29, a pin 30 and a moving nut seat 31. The trapezoidal screw 27 (i.e., the screw) is threadedly connected to the fixed nut seat 28 at both ends of the axial direction, and the fixed nut seat 28 is fixed on the platform 17 by fasteners (the axis of the trapezoidal screw 27 is parallel to the surface of the platform 17). The trapezoidal screw 27 and the fixed nut seat 28 are threadedly matched to form a spiral transmission pair in which the fixed nut seat 28 is fixed, the trapezoidal screw 27 rotates and moves linearly along its own axis. At the same time, a moving nut seat 31 is threadedly connected between the two fixed nut seats 28 on the trapezoidal screw 27. The trapezoidal screw 27 and the moving nut seat 31 are threadedly matched to form a spiral transmission pair in which the trapezoidal screw 27 rotates in place relative to the moving nut seat 31, and the moving nut seat 31 moves linearly along the axis of the trapezoidal screw 27. A displacement sensor for measuring the linear displacement of the moving nut seat 31 is provided on the moving nut seat 31.

[0050] One end of the connecting shaft 29 is pin-connected to the moving nut seat 31 through a pin shaft 30. The connecting shaft 39 can rotate around the axis of the pin shaft 30, and the other end is connected to the deflection slide 22. The axis of the pin shaft 30 is perpendicular to the surface of the table 17. When the moving nut seat 31 moves linearly along the axis of the trapezoidal screw 27, the connecting shaft 29 rotates around the axis of the pin shaft 30, realizing the swing of the connecting shaft 29, and then driving the deflection slide 22 to rotate around the rotation axis.

[0051] The principle of the angle misalignment adjustment component is as follows: the axis of gear A is consistent with the longitudinal direction of the table 17. Since the position of the table 17 is fixed, the axis direction of gear A is fixed. The axis of gear B installed on the deflection slide 22 is parallel to the axis of the connecting shaft 29 in the differential screw mechanism 2, that is, consistent with the longitudinal direction of the deflection slide 22. The deflection slide 22 has a deflection movement around the rotation axis relative to the driving slide 20. The deflection slide 22 drives gear B to rotate, thereby adjusting the angle between the axes of the two gears to realize the misaligned meshing simulation of the gear pair.

[0052] The differential screw mechanism uses two screw transmission pairs on it to achieve a combination of various moving distances by changing the parameters of the trapezoidal screw 27. According to the relationship that the arc length is equal to the product of the deflection angle and the rotation radius, the distance that the trapezoidal screw 27 in the differential screw mechanism needs to move can be calculated from the known gear meshing misalignment deflection angle. This distance is monitored by a displacement sensor to achieve accurate simulation of misalignment meshing.

[0053] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A comprehensive test bench for contact spots and transmission errors of transmission assemblies, characterized in that: include: A platform (17) and a driving assembly and a loading assembly mounted on the platform (17); The driving assembly comprises: a driving motor (1), a driving end reducer (2) and a driving spindle box assembly (6); the output end of the driving motor (1) is connected to one end of a driving spindle in the driving spindle box assembly (6) through the driving end reducer (2), and a driving end torque sensor (4) is arranged on the shaft system between the driving end reducer (2) and the driving spindle box assembly (6); the other end of the driving spindle in the driving spindle box assembly (6) is connected to the input shaft of a transmission test piece (8); and an angle measurement module is installed on the driving spindle; The loading component comprises: a loading motor (14), a loading end reducer (13) and a loading spindle box assembly (9); the output end of the loading motor (14) is connected to one end of a loading spindle in the loading spindle box assembly (9) via the loading end reducer (13); a loading end torque sensor (11) is arranged on the shaft system between the loading end reducer (13) and the loading spindle box assembly (9); the other end of the loading spindle in the loading spindle box assembly (9) is connected to the output shaft of the transmission test piece (8), and an angle measurement module is installed on the loading spindle; Before the transmission error test, a contact spot test is performed in advance. If the position and shape of the contact spot of the tested gear pair meet the set requirements, the transmission error test is then performed on the transmission test piece (8); if the position and shape of the contact spot of the tested gear pair do not meet the set requirements, the contact state of the tested gear pair is first adjusted until the position and shape of the contact spot of the tested gear pair meet the set requirements after the contact spot test, and then the transmission error test is performed; It also comprises: a driving slide plate (20), wherein the driving assembly is mounted on the platform (17) via the driving slide plate (20); the axial direction of the driving assembly is the longitudinal direction, and the direction perpendicular to the longitudinal direction on the support surface of the platform (17) is the transverse direction; the driving slide plate (20) is mounted on the platform (17) via a transverse guide rail, and the driving slide plate (20) can move transversely on the platform (17) along the transverse guide rail; The invention also comprises: an angle misalignment adjustment component; the angle misalignment adjustment component comprises: a deflection slide plate (22), a rotation axis and an angle misalignment adjustment mechanism (23); the driving slide plate (20) is mounted on the deflection slide plate (22) via a transverse guide rail; the deflection slide plate (22) is vertically fixed on the platform (17) via the rotation axis; the deflection slide plate (22) can rotate around the rotation axis on the platform (17) under the action of the angle misalignment adjustment mechanism (23); The two gears in misaligned meshing are respectively gear A and gear B, wherein gear A is mounted on the platform (17), and gear B is mounted on the deflection slide (22), and the deflection slide (22) drives gear B to rotate, thereby changing the angle between the axes of gear A and gear B; The angle misalignment adjustment mechanism (23) is a differential screw mechanism; The differential screw mechanism comprises: a trapezoidal screw (27), a fixed nut seat (28), a connecting shaft (29), a pin shaft (30) and a moving nut seat (31); both axial ends of the trapezoidal screw (27) are threadedly connected to the fixed nut seat (28), the fixed nut seat (28) is fixed on the platform (17), the trapezoidal screw (27) and the fixed nut seat (28) are threadedly matched to form a spiral transmission pair in which the fixed nut seat (28) is fixed, the trapezoidal screw (27) performs a rotational motion and moves linearly along its own axis; the moving nut seat (31) is threadedly connected between the two fixed nut seats (28) on the trapezoidal screw (27), the trapezoidal screw (27) and the moving nut seat (31) are threadedly matched to form a spiral transmission pair in which the trapezoidal screw (27) rotates in place relative to the moving nut seat (31), and the moving nut seat (31) moves linearly along the axis of the trapezoidal screw (27); One end of the connecting shaft (29) is connected to the moving nut seat (31) through a pin shaft (30), and the connecting shaft (29) can rotate around the axis of the pin shaft (30), and the other end is connected to the deflection slide plate (22); when the moving nut seat (31) moves linearly along the axis of the trapezoidal screw (27), the connecting shaft (29) drives the deflection slide plate (22) to rotate around the rotation axis.

2. The contact spot and transmission error comprehensive test bench for a transmission assembly as claimed in claim 1, characterized in that: Also includes: A loading slide (16); the loading assembly is mounted on the platform (17) via the loading slide (16); the axial direction of the driving assembly is longitudinal, and the direction perpendicular to the longitudinal direction on the support surface of the platform (17) is transverse; the loading slide (16) is mounted on the platform (17) via a longitudinal guide rail, and the loading slide (16) can move longitudinally on the platform (17) along the longitudinal guide rail.

3. The contact spot and transmission error comprehensive test bench for a transmission assembly as claimed in claim 1, characterized in that: The driving spindle box assembly (6) comprises: a driving spindle (24) and a driving spindle box body (25); the driving spindle (24) is located in the driving spindle box body (25), and both ends of the driving spindle (24) extend out of the driving spindle box body (25) and are supported on the driving spindle box body (25) through bearings; The structure of the loading spindle box assembly (9) is the same as that of the driving spindle box assembly (6), and comprises a loading spindle and a loading spindle box body.

4. The contact spot and transmission error comprehensive test bench for a transmission assembly as claimed in claim 1, characterized in that: One end of the drive end torque sensor (4) is connected to the drive end reducer (2) via a flange, and the other end is connected to one end of the drive end coupling (5) via a flange, and the other end of the drive end coupling (5) is connected to the drive spindle box assembly (6); One end of the loading end torque sensor (11) is connected to the loading end reducer (13) via a flange, and the other end is connected to one end of the loading end coupling (10) via a flange, and the other end of the loading end coupling (10) is connected to the loading spindle box assembly (9).

5. The contact spot and transmission error comprehensive test bench for a transmission assembly as claimed in claim 4, characterized in that: The driving end coupling (5) and the loading end coupling (10) are both double-diaphragm elastic couplings.

6. The contact spot and transmission error comprehensive test bench for a transmission assembly as claimed in claim 1, characterized in that: The driving motor (1) and the loading motor (14) are both motors with a zero-speed load starting function.

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