Device and method for measuring damping torque of overrunning clutch

Abstract

The invention belongs to the technical field of torque measurement, and discloses an overrun clutch damping torque measuring device and method, and the device comprises a drive motor, a first coupler, a step-up gear box, a second coupler, a switching gear box, a third coupler, a torque sensor, a flange fixing device, and a static friction torque measuring part. A transmission shaft of the driving motor is connected with the input end of the step-up gear box through a first coupler, the output end of the step-up gear box is connected with an output flange of the switching gear box through a second coupler, and an input flange of the switching gear box is connected with the input end of the torque sensor through a third coupler. The output end of the torque sensor is connected with the flange fixing device, and the static friction torque measuring component is configured to be connected with the output flange. According to the invention, indirect measurement is carried out through the switching gear box, the torque sensor does not need to rotate, fluctuation caused by rotation is isolated, the measurement requirement can be met by adopting the small-range torque sensor, and the measurement cost is lower.

Description

Technical Field

[0001] The present invention belongs to the technical field of torque measurement, and particularly relates to an overrunning clutch damping torque measurement device and method. Background Art

[0002] The main reducer clutch of the helicopter transmission system is used between the engine and the transmission system. When disengaged, it can coordinate the speed mismatch at both ends, and when engaged, it can transmit the engine power to the transmission system. When the clutch is in the overrunning state, when the parts with different rotational speeds inside the clutch come into contact, a damping torque will be generated due to friction. If the damping torque of the clutch is not designed reasonably, it will not only affect the reliability of the clutch engagement and disengagement functions, but also affect the overrunning wear performance of the clutch.

[0003] Existing measurement methods, such as Figure 1 As shown, the clutch is installed in the clutch adapter box 4. The output end of the clutch is connected to the torque sensor 3 through a coupling. The torque sensor 3 is then connected to the speed increasing gearbox 2 through a coupling. The speed increasing gearbox 2 is connected to the drive motor 1 through a coupling. During measurement, the input end of the clutch is fixed, and the drive motor 1 drives the output end of the clutch to rotate to the rated speed through the speed increasing gearbox, and the damping torque value is obtained through the reading of the torque sensor 3.

[0004] Since the rated speed of common clutches is relatively high, up to 16000 r / min at most, and the damping torque is too small, usually not greater than 10 N·m, the accuracy of damping torque measurement has high requirements for the performance of the torque sensor. The existing measurement methods have the following problems:

[0005] 1. The torque sensor needs to rotate together with the output end of the clutch, which will cause fluctuations in the measured value and bring errors.

[0006] 2. In the measurement method, since the torque sensor needs to rotate and the damping torque value is usually < 10 N·m, in order to measure accurately, a high-speed and high-precision torque sensor needs to be selected, resulting in high measurement costs.

[0007] 3. Due to the too small damping torque value, fluctuations in the drive motor speed will cause measurement errors. Summary of the Invention

[0008] In view of the above problems, the present invention provides an overrunning clutch damping torque measurement device and method, adopting the following technical solutions:

[0009] An overrunning clutch damping torque measurement device includes a drive motor, a first coupling, a speed increasing gearbox, a second coupling, a transfer gearbox, a third coupling, a torque sensor, a flange fixing device, and a static friction torque measurement component;

[0010] Wherein, the transmission shaft of the driving motor is connected to the input end of the speed increasing gearbox through the first coupling; the output end of the speed increasing gearbox is connected to the output flange of the transfer gearbox through the second coupling; the input flange of the transfer gearbox is connected to the input end of the torque sensor through the third coupling; the output end of the torque sensor is connected to the flange fixing device; the static friction torque measuring component is configured to be connected to the output flange, and the static friction torque measuring component is used for measuring the static friction torque of the transfer gearbox.

[0011] Furthermore, it further includes a motor support, and the driving motor is detachably connected to the motor support.

[0012] Furthermore, it further includes a sensor support and a gearbox support. The torque sensor is fixedly arranged on the sensor support, and the transfer gearbox is fixedly arranged on the gearbox support.

[0013] Furthermore, the motor support, the speed increasing gearbox, the gearbox support, the sensor support, and the flange fixing device are arranged at intervals in sequence.

[0014] Furthermore, the transfer gearbox includes a casing, an input gear shaft, a test piece nozzle, an output gear shaft, and an output floating shaft;

[0015] Wherein, the output gear shaft is arranged in the casing, and both ends of the output gear shaft are mounted on the casing through bearings; the clutch is configured to be mounted in the output gear shaft through two bearings, the clutch is configured to be in transmission connection with the output gear shaft through splines, and the output end of the clutch is configured to be connected to the output flange through the output floating shaft;

[0016] The input gear shaft is arranged in the casing, and both ends of the input gear shaft are mounted on the casing through bearings; the output gear shaft is in transmission connection with the input gear shaft through gears, one end of the input gear shaft is key-connected to the input flange, and the test piece nozzle is fixedly arranged on the casing, and the test piece nozzle is used for conveying lubricating oil to the clutch.

[0017] Furthermore, the axial center line of the input gear shaft is parallel to the axial center line of the output gear shaft, the output gear shaft is close to the middle of the casing, and the input gear shaft is located on one side of the output gear shaft.

[0018] Furthermore, the static friction torque measuring component includes a measuring rod, weights, and a spirit level;

[0019] Wherein, the middle part of the measuring rod is fixedly connected to the output flange of the transfer gearbox, the weight is arranged at one end of the measuring rod, and the spirit level is used to measure whether the measuring rod is in a horizontal state.

[0020] Furthermore, an external lubrication system is further included, and the external lubrication system is connected to the test piece nozzle.

[0021] The present invention also provides a method for measuring the damping torque of an overrunning clutch, which is realized based on the overrunning clutch damping torque measuring device, and includes the following steps:

[0022] Start the driving motor. After the speed is increased by the speed increasing gearbox, drive the output end of the clutch to reach the set speed.

[0023] Convey lubricating oil at different temperatures to the clutch in the transfer gearbox. After the speed of the driving motor is stable, read the indication of the torque sensor.

[0024] Measure the static friction torque of the transfer gearbox through the static friction torque measuring component, and determine the damping torque of the clutch according to the indication of the torque sensor and the static friction torque of the transfer gearbox.

[0025] Furthermore, the static friction torque measuring component includes a measuring rod, a weight and a spirit level; wherein, the middle part of the measuring rod is fixedly connected to the output flange of the transfer gearbox, the weight is arranged at one end of the measuring rod, and the spirit level is used to measure whether the measuring rod is in a horizontal state; measuring the static friction torque of the transfer gearbox through the static friction torque measuring component includes the following steps:

[0026] Install the measuring rod on the output flange of the transfer gearbox, adjust the position of the measuring rod. After determining that the measuring rod is in a horizontal state through the spirit level, add a weight at one end of the measuring rod according to the reverse direction of the clutch output direction.

[0027] Adjust the weight of the weight and obtain the mass of the weight that makes the output floating shaft of the transfer gearbox rotate.

[0028] Calculate the static friction torque of the transfer gearbox according to the mass of the weight that can make the output floating shaft of the transfer gearbox rotate and the distance between the fulcrum of the weight on the measuring rod and the midpoint of the output flange.

[0029] The beneficial effects of the present invention:

[0030] 1. The measuring device of the present invention measures indirectly through the transfer gearbox. The torque sensor does not need to rotate, isolating the fluctuations caused by rotation and also isolating the torque fluctuations caused by the speed control fluctuations of the driving motor.

[0031] 2. The torque sensor of the measuring device of the present invention does not need to rotate, and a small-range torque sensor can meet the measurement requirements, and the measurement cost is lower.

[0032] 3. Through the gear meshing of the transfer gearbox, the damping torque of the clutch can be amplified in the present invention, making the measurement result more accurate.

[0033] 4. By offsetting the axial centerline of the input gear shaft of the transfer gearbox in the present invention, it is convenient to set the test piece nozzle to simulate the lubrication state when the clutch works, and the lubrication state when the clutch works can be simulated more accurately.

[0034] 5. Compared with the existing measurement device, the present invention reduces one high-speed coupling (the second coupling), is simpler to install and more accurate in measurement.

[0035] Other features and advantages of the present invention will be described in the subsequent specification, and part of them will be obvious from the specification or learned by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 Shows a schematic diagram of an overrunning clutch damping torque measuring device according to the prior art;

[0038] Figure 2 Shows a structural schematic diagram of an overrunning clutch damping torque measuring device according to an embodiment of the present invention;

[0039] Figure 3 Shows a structural schematic diagram of the transfer gearbox according to an embodiment of the present invention;

[0040] Figure 4 Shows an installation schematic diagram of the measuring rod and the transfer gearbox according to an embodiment of the present invention.

[0041] In the figure: 1. Driving motor; 2. Speed increasing gearbox; 3. Torque sensor; 4. Clutch transfer box; 5. Motor support; 6. First coupling; 7. Second coupling; 8. Transfer gearbox; 9. Third coupling; 10. Flange fixing device; 11. Gearbox support; 12. Sensor support; 13. Casing; 14. Input gear shaft; 15. Input flange; 16. Test piece nozzle; 17. Clutch; 18. Output gear shaft; 19. Output floating shaft; 20. Output flange; 21. Measuring rod. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] It should be noted that the terms "first", "second", etc. in this application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present application here. In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings.

[0044] The present invention provides an overrunning clutch damping torque measuring device and method, which can be used for the overrunning clutch of the main speed reducer of the helicopter transmission system, can also be used for other civilian overrunning clutches, and can also be used for other components such as bearings that need to measure damping torque. The present invention can accurately measure the damping torque of the clutch, has low performance requirements for the torque sensor, reduces the measurement cost, and can also shield the influence of the rotational speed fluctuation of the motor on the measurement result.

[0045] As Figure 2 shown, an overrunning clutch 17 damping torque measuring device includes a motor support 5, a driving motor 1, a first coupling 6, a speed increasing gearbox 2, a second coupling 7, a transfer gearbox 8, a third coupling 9, a torque sensor 3, a flange fixing device 10, a gearbox support 11 and a sensor support 12.

[0046] Among them, the motor support 5, the speed increasing gearbox 2, the gearbox support 11, the sensor support 12, and the flange fixing device 10 are arranged at intervals in sequence. The driving motor 1 is arranged on the motor support 5, the driving motor 1 is detachably connected to the top of the motor support 5, and the transmission shaft of the driving motor 1 is connected to the input end of the speed increasing gearbox 2 through the first coupling 6. The output end of the speed increasing gearbox 2 is connected to the output flange 20 of the transfer gearbox 8 through the second coupling 7.

[0047] The input flange 15 of the transfer gearbox 8 is connected to the input end of the torque sensor 3 through the third coupling 9. The output end of the torque sensor 3 is connected to the flange fixing device 10. The torque sensor 3 is fixedly arranged on the sensor support 12, and the transfer gearbox 8 is fixedly arranged on the gearbox support 11.

[0048] Among them, the first coupling 6 and the third coupling 9 are low-speed couplings, and the second coupling 7 is a high-speed coupling. In the existing measurement scheme, when the output speed of the clutch 17 exceeds 10,000 r / min, a pedestal-type torque sensor 3 needs to be selected, which requires the use of 2 high-speed couplings. In the embodiment of the present invention, only 1 high-speed coupling is needed, and the installation is simpler and the measurement is more accurate.

[0049] During measurement by the measurement device according to the embodiment of the present invention, the torque sensor 3 does not need to rotate. A small-range torque sensor 3 can meet the measurement requirements, and a high-speed and high-precision torque sensor 3 is not required, so the measurement cost is low.

[0050] As Figure 3 shown, for example, the transfer gearbox 8 includes a casing 13, an input gear shaft 14, a test piece nozzle 16, an output gear shaft 18, and an output floating shaft 19.

[0051] The output gear shaft 18 is arranged in the casing 13, and both ends of the output gear shaft 18 are mounted on the casing 13 through bearings; the clutch 17 is configured to be mounted in the output gear shaft 18 through two bearings, and the clutch 17 is configured to be in power transmission connection with the output gear shaft 18 through a spline to transmit torque, and the output end of the clutch 17 is configured to be connected to the output flange 20 through the output floating shaft 19.

[0052] The input gear shaft 14 is arranged in the casing 13, and both ends of the input gear shaft 14 are mounted on the casing 13 through bearings; the axial center line of the input gear shaft 14 is parallel to the axial center line of the output gear shaft 18. The output gear shaft 18 is close to the middle of the casing 13, and the input gear shaft 14 is located on one side of the output gear shaft 18; the output gear shaft 18 is in power transmission connection with the input gear shaft 14 through a pair of gears, and one end of the input gear shaft 14 is key-connected to the input flange 15. For example, spline connection can be adopted.

[0053] The test piece nozzle 16 is fixedly arranged on the casing 13 and is located on the side of the output gear shaft 18 away from the output flange 20. The test piece nozzle 16 is used to deliver lubricating oil to the clutch 17.

[0054] In the embodiment of the present invention, the transfer gearbox 8 is provided to measure the damping torque. The transfer gearbox 8 transmits torque through gear meshing, and offsets the axial center line of the input gear shaft 14, which is convenient for setting the test piece nozzle 16 to simulate the lubrication state when the clutch 17 works, and can more accurately simulate the lubrication state when the clutch 17 works.

[0055] In the embodiment of the present invention, the damping torque is indirectly measured through the transfer gearbox 8. The torque sensor 3 does not need to rotate, isolating the fluctuations caused by the rotation of the drive motor 1 and also isolating the torque fluctuations caused by the motor speed control fluctuations.

[0056] The transfer gearbox 8 in the embodiment of the present invention can amplify the damping torque through the gear meshing between the input gear shaft 14 and the output gear shaft 18. The amplification value can be designed according to its own situation, which can make the measurement of the damping torque more accurate and reduce other errors.

[0057] For example, the transfer gearbox 8 can be replaced with a transfer box with only a single shaft. The clutch 17 is installed in the rotating shaft of the transfer box. The input end of the clutch 17 is fixedly connected to the rotating shaft. The torque sensor 3 is connected to the rotating shaft through a coupling, and the rest is implemented according to the technical solution of the present invention and can also be used.

[0058] For example, the damping torque measuring device of the overrunning clutch 17 further includes a static friction torque measuring component, which is configured to be connected to the output flange 20 of the transfer gearbox 8, and the static friction torque measuring component is used to measure the static friction torque of the transfer gearbox 8.

[0059] As Figure 4 shown, for example, the static friction torque measuring component includes a measuring rod 21, weights and a spirit level. Among them, the middle part of the measuring rod 21 is fixedly connected to the output flange 20 of the transfer gearbox 8, the weights are arranged at one end of the measuring rod 21, and the spirit level is used to measure whether the measuring rod 21 is in a horizontal state.

[0060] For example, a fixing hole is provided in the middle of the measuring rod 21 and is fixedly connected to the output flange 20 through the fixing hole. Through holes are also provided at both ends of the measuring rod 21 for hanging the weights.

[0061] For example, the damping torque measuring device of the overrunning clutch 17 further includes an external lubrication system, which is connected to the test piece nozzle 16, and the external lubrication system is used to deliver lubricating oil to the test piece nozzle 16.

[0062] Based on the above damping torque measuring device of the overrunning clutch 17, the embodiment of the present invention also provides a method for measuring the damping torque of the overrunning clutch 17, including the following steps:

[0063] S1. Start the drive motor 1. After being speeded up by the speed increasing gearbox 2, drive the output end of the clutch 17 to reach the set speed.

[0064] S2. Deliver lubricating oil with different temperatures to the clutch 17 in the transfer gearbox 8. After the speed of the drive motor 1 is stable, read the indication of the torque sensor 3 and record it as T.

[0065] For example, the external lubrication system supplies lubricating oil at different temperatures to the clutch 17 in the adapter gearbox 8 through the test piece nozzle 16.

[0066] The damping torque recorded at this time is relatively small because the damping torque generated by the rotation of the output shaft of the clutch 17 needs to overcome the static friction torques of the two gear shafts of the adapter gearbox 8. Therefore, it is necessary to continue measuring the static friction torque values of the two gear shafts of the adapter gearbox 8.

[0067] S3. Measure the static friction torque of the adapter gearbox 8 through the static friction torque measuring component, and determine the damping torque of the overrunning clutch 17 based on the reading of the torque sensor 3 and the static friction torque of the adapter gearbox 8.

[0068] Among them, the steps for the static friction torque measuring component to measure the static friction torque of the adapter gearbox 8 are as follows: Install the measuring rod 21 on the output flange 20 of the adapter gearbox 8, adjust the position of the measuring rod 21, and after determining that the measuring rod 21 is in a horizontal state through the spirit level, add weights to one end of the measuring rod 21 in the opposite direction of the output direction of the clutch 17 (this direction can engage the clutch 17 and make the output gear shaft 18 and the input gear shaft 14 of the adapter gearbox 8 rotate together).

[0069] Adjust the weight of the weights and obtain the mass of the weights that can make the output floating shaft 19 of the adapter gearbox 8 rotate, including the following steps: Confirm whether the output floating shaft 19 of the adapter gearbox 8 can be rotated through weights of different weights, estimate the static friction torque value, then adjust the weight of the weights according to the static friction torque value so that the torque generated by the finally added weight of the weights is the same as the required accuracy level for damping torque measurement, repeat the measurement multiple times and take the average value to obtain the mass m of the weights that can make the output floating shaft 19 of the adapter gearbox 8 rotate.

[0070] Calculate the static friction torque of the adapter gearbox 8 based on the mass m of the weights that can make the output floating shaft 19 of the adapter gearbox 8 rotate and the distance r between the fulcrum of the weights on the measuring rod 21 and the midpoint of the output flange 20.

[0071] The calculation formula is as follows:

[0072]

[0073] Among them, I represents the speed ratio of the adapter gearbox 8; Z1 represents the number of teeth of the input gear shaft 14 of the adapter gearbox 8; Z2 represents the number of teeth of the output gear shaft 18 of the adapter gearbox 8.

[0074]

[0075] Among them, M p represents the damping torque; T represents the reading of the torque sensor 3; m aIt represents the average mass of the weights that cause the output floating shaft 19 of the transfer gearbox 8 to rotate; g represents the value of the acceleration due to gravity, which is taken according to the local acceleration due to gravity value.

[0076] In the embodiment of the present invention, the damping torque of the clutch 17 is measured more accurately through the measured value of the torque sensor 3 and the measured value of the static friction torque.

[0077] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An overrunning clutch damping torque measuring device, characterized in that, It includes a drive motor (1), a first coupling (6), a speed increasing gearbox (2), a second coupling (7), a transfer gearbox (8), a third coupling (9), a torque sensor (3), a flange fixing device (10) and a static friction torque measuring component; Wherein, the transmission shaft of the drive motor (1) is connected to the input end of the speed increasing gearbox (2) through the first coupling (6), the output end of the speed increasing gearbox (2) is connected to the output flange (20) of the transfer gearbox (8) through the second coupling (7), the input flange (15) of the transfer gearbox (8) is connected to the input end of the torque sensor (3) through the third coupling (9), the output end of the torque sensor (3) is connected to the flange fixing device (10), and the static friction torque measuring component is configured to be connected to the output flange (20), and the static friction torque measuring component is used to measure the static friction torque of the transfer gearbox (8).

2. The overrunning clutch damping torque measuring device according to claim 1, characterized in that, It further includes a motor support (5), and the drive motor (1) is detachably connected to the motor support (5).

3. The overrunning clutch damping torque measuring device according to claim 2, characterized in that It further includes a sensor support (12) and a gearbox support (11), the torque sensor (3) is fixedly arranged on the sensor support (12), and the transfer gearbox (8) is fixedly arranged on the gearbox support (11).

4. The overrunning clutch damping torque measuring device according to claim 3, characterized in that, The motor support (5), the speed increasing gearbox (2), the gearbox support (11), the sensor support (12), and the flange fixing device (10) are arranged at intervals in sequence.

5. The overrunning clutch damping torque measuring device according to any one of claims 1-4, characterized in that, The transfer gearbox (8) includes a casing (13), an input gear shaft (14), a test piece nozzle (16), an output gear shaft (18) and an output floating shaft (19); Wherein, the output gear shaft (18) is arranged in the casing (13), and both ends of the output gear shaft (18) are mounted on the casing (13) through bearings; the clutch (17) is configured to be mounted in the output gear shaft (18) through two bearings, the clutch (17) is configured to be in transmission connection with the output gear shaft (18) through a spline, and the output end of the clutch (17) is configured to be connected to the output flange (20) through the output floating shaft (19); The input gear shaft (14) is arranged in the casing (13), and both ends of the input gear shaft (14) are mounted on the casing (13) through bearings; the output gear shaft (18) is in transmission connection with the input gear shaft (14) through gears, one end of the input gear shaft (14) is key-connected to the input flange (15), and the test piece nozzle (16) is fixedly arranged on the casing (13), and the test piece nozzle (16) is used to convey lubricating oil to the clutch (17).

6. The overrunning clutch damping torque measuring device according to claim 5, characterized in that, The axial center line of the input gear shaft (14) is parallel to the axial center line of the output gear shaft (18), the output gear shaft (18) is close to the middle of the casing (13), and the input gear shaft (14) is located on one side of the output gear shaft (18).

7. The overrunning clutch damping torque measuring device according to claim 1, characterized in that, The static friction torque measuring component includes a measuring rod (21), weights, and a spirit level; Among them, the middle part of the measuring rod (21) is fixedly connected to the output flange (20) of the transfer gearbox (8), the weights are arranged at one end of the measuring rod (21), and the spirit level is used to measure whether the measuring rod (21) is in a horizontal state.

8. The overrunning clutch damping torque measuring device according to claim 5, characterized in that It further includes an external lubrication system, and the external lubrication system is connected to the test piece nozzle (16).

9. A method for measuring the damping torque of an overrunning clutch, characterized in that, It is implemented based on the overrunning clutch damping torque measuring device according to any one of claims 1-8, and includes the following steps: Start the driving motor (1), and after increasing the speed through the speed increasing gearbox (2), drive the output end of the clutch (17) to reach the set speed; Convey lubricating oil at different temperatures to the clutch (17) in the transfer gearbox (8). After the speed of the driving motor (1) is stable, read the indication of the torque sensor (3); Measure the static friction torque of the transfer gearbox (8) through the static friction torque measuring component, and determine the damping torque of the clutch (17) according to the indication of the torque sensor (3) and the static friction torque of the transfer gearbox (8).

10. The overrunning clutch damping torque measurement method according to claim 9, characterized in that, The static friction torque measuring component includes a measuring rod (21), weights, and a spirit level; among them, the middle part of the measuring rod (21) is fixedly connected to the output flange (20) of the transfer gearbox (8), the weights are arranged at one end of the measuring rod (21), and the spirit level is used to measure whether the measuring rod (21) is in a horizontal state; measuring the static friction torque of the transfer gearbox (8) through the static friction torque measuring component includes the following steps: Install the measuring rod (21) on the output flange (20) of the transfer gearbox (8), adjust the position of the measuring rod (21), and after determining that the measuring rod (21) is in a horizontal state through the spirit level, add weights at one end of the measuring rod (21) in the opposite direction of the output direction of the clutch (17); Adjust the weight of the weights and obtain the mass of the weights that can make the output floating shaft (19) of the transfer gearbox (8) rotate; Calculate the static friction torque of the transfer gearbox (8) according to the mass of the weights that can make the output floating shaft (19) of the transfer gearbox (8) rotate and the distance between the fulcrum of the weights on the measuring rod (21) and the midpoint of the output flange (20).

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