Differential performance detection device

Abstract

The present invention relates to a differential performance detection device, which belongs to the field of differential detection technology. The device comprises a detection terminal connected to the axial end face of a planetary gear; a detector arranged opposite to the detection terminal; a surface of the detector facing the detection terminal is provided with a displacement sensor; the surface of the detector provided with the displacement sensor abuts the detection terminal, and the axial pressure of the abutment between the two is zero; a driving part, which is used to drive the bevel gear to rotate; a processor, which is connected to the displacement sensor; the instant when the driving part drives the bevel gear to rotate is counted as a first moment, and after the bevel gear rotates, power is transmitted to the planetary gear through rotational engagement, and the displacement sensor is used to detect whether the planetary gear rotates, and the instant when the displacement sensor feedback signal is counted as a second moment. By detecting the meshing clearance at the first moment and the second moment, it is possible to determine whether the differential has a tooth pitch out-of-tolerance problem, thereby achieving a precise positioning effect for differential fault detection.

Description

Technical Field

[0001] The present invention relates to the technical field of differential detection, and in particular to a differential performance detection device. Background Art

[0002] As a core component of the vehicle transmission system, the performance of the differential directly affects the vehicle's steering stability and power distribution efficiency. With the complex operating conditions of new energy vehicles, the reliability requirements for the differential are increasing.

[0003] Due to the high torque characteristics of the motor, the planetary gears of new energy vehicle differentials are often faced with transient impact loads, so the planetary gears will fail due to torque fatigue. Although traditional detection mechanisms can simulate torsional fatigue to determine whether the differential gear set has failed, they lack the ability to dynamically capture the microscopic tooth surface stress distribution. Differential failures may be caused by many factors, such as the tooth pitch or structural deformation between the planetary gears and bevel gears. Torque detection cannot rule out differential failures caused by deformation or overheating at other points in the differential gear set. Summary of the Invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the inability of the existing technology to accurately identify the specific cause of the differential gear set failure problem. Therefore, a differential performance detection device is provided, which can determine the cause of the differential pitch out-of-tolerance and detect the tooth pitch between the planetary gear and the bevel gear, thereby achieving accurate positioning of the differential fault detection.

[0005] To solve the above technical problems, the present invention provides a differential performance detection device, wherein the differential includes a planetary gear and a bevel gear meshing therewith, wherein lubricating oil is provided at the meshing portion between the planetary gear and the bevel gear. The performance detection device is used to detect the meshing clearance between the planetary gear and the bevel gear, and comprises:

[0006] a detection terminal connected to an axial end face of the planetary gear;

[0007] A detector is arranged facing the detection terminal; a displacement sensor is arranged on a surface of the detector facing the detection terminal; a surface of the detector on which the displacement sensor is arranged abuts against the detection terminal, and an axial pressure between the two abutting against each other is zero;

[0008] A driving unit, which is used to drive the bevel gear to rotate;

[0009] a processor connected to the displacement sensor; the instant when the driving unit drives the bevel gear to rotate is counted as a first moment; after the bevel gear rotates, power is transmitted to the planetary gear through rotational meshing; the displacement sensor is used to detect whether the planetary gear rotates, and the instant when the displacement sensor feedback signal is counted as a second moment; the meshing clearance is detected based on the first moment and the second moment;

[0010] The device further comprises a heating mechanism, wherein the heating mechanism is used to heat the lubricating oil so that the lubricating oil is in a fluid state during the detection process;

[0011] A detection end face is provided on the detector, and the displacement sensor is fixed on the surface of the detection end face; a vibration sensor is also provided on the detection end face, and when the planetary gear rotates under the drive of the bevel gear, the vibration sensor generates instantaneous feedback for the axial offset movement of the planetary gear; the second moment is determined based on the feedback results of both the vibration sensor and the displacement sensor.

[0012] In one embodiment of the present invention, the heating mechanism includes an electric heating wire, and the electric heating wire is an iron-chromium-aluminum heating wire.

[0013] In one embodiment of the present invention, the detector surface is coated with an aluminum foil coating.

[0014] In one embodiment of the present invention, the device further comprises a telescopic rod for driving the detector to move closer to or away from the detection terminal.

[0015] In one embodiment of the present invention, the device further comprises,

[0016] A support portion, comprising a buffer air pump and a shaped block connected to the buffer air pump; the shaped block is used to place the differential;

[0017] a pressure sensor fixed to the detector and connected to the buffer air pump signal, the pressure sensor being used to detect the pressure value transmitted to the detector by the gravity of the differential when the differential is placed on the contoured block;

[0018] When the telescopic rod drives the detector to contact the detection terminal, the buffer air pump supports the differential and adjusts the telescopic distance so as to keep the axial pressure between the detector and the surface of the detection terminal continuously at zero.

[0019] In one embodiment of the present invention, the driving portion includes a driving source and a fixing collar connected to a power output end of the driving source. A threaded hole is formed on an outer wall of the fixing collar, and a fixing nut is threadedly connected in each of the threaded holes.

[0020] In one embodiment of the present invention, the driving unit further includes

[0021] a horizontal slideway extending toward the placement direction of the differential;

[0022] The placing platform is slidably connected to the horizontal slideway, and the driving source is fixed on the placing platform.

[0023] In one embodiment of the present invention, the device further comprises:

[0024] A limiting plate, wherein the limiting plate is provided with a limiting groove matching the shape of the placement groove of the profiling block;

[0025] The lifting cylinder has a power output end fixed to a limit plate, and drives the limit plate to move closer to or away from the surface of the profiling block.

[0026] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0027] The differential performance detection device described in the present invention is configured to perform fixed-point detection on the planetary gears of the differential. The device can determine the current state of the planetary gears by performing interference detection on the detection terminals of the planetary gears on the differential, thereby determining whether the fault of the differential gear set is caused by an excessive tooth pitch between the planetary gears and the bevel gears.

[0028] The detection of the planetary gear detection terminal adopts the method of detector contact. A displacement sensor is fixed at the end of the detector. The displacement sensor contacts the center of the terminal surface of the planetary gear. When the planetary gear surface displaces, the displacement sensor will transmit an electrical signal to the processor, so that the time it takes for the driving unit to drive the planetary gear to rotate can be used to determine whether the planetary gear pitch is out of tolerance.

[0029] Secondly, during the detection process, the time when the bevel gear is driven to rotate is the first moment, and the instant when the displacement sensor transmits the signal is the second moment. By recording the time difference between the first moment and the second moment as the measured time difference, and then comparing it with the standard time difference between the second moment and the first moment when the intact bevel gear and planetary gear are linked under the standard, it is determined whether the numerical fluctuation range of the measured time difference and the standard time difference at this time is within the normal fluctuation range. On this basis, the cause of the differential gear set failure is determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0031] Figure 1 A schematic diagram of the overall structure of the device in a preferred embodiment of the present invention;

[0032] Figure 2 For the present invention Figure 1 Schematic cross-section of some structures;

[0033] Figure 3 for Figure 2 A magnified schematic diagram of point A in the middle;

[0034] Figure 4 It is a cross-sectional diagram showing the pitch structure of a dual gear set;

[0035] Figure 5 for Figure 4 A magnified schematic diagram of point B in the middle;

[0036] Figure 6 It is a partial structural diagram of the detector in the present invention;

[0037] Figure 7 The schematic diagram of the overall structure of the device in the preferred embodiment of the present invention is as follows Figure 2 .

[0038] Description of the accompanying drawings:

[0039] 1. Differential; 11. Planetary gear; 111. Detection terminal; 12. Bevel gear;

[0040] 2. Detector; 21. Displacement sensor; 22. Detection end face; 23. Vibration sensor;

[0041] 3. Driving unit; 31. Driving source; 32. Fixing collar; 321. Threaded hole; 33. Horizontal slide; 34. Placement table;

[0042] 4. Heating mechanism; 41. Electric heating wire;

[0043] 5. Support part; 51. Telescopic rod; 52. Profiling block; 53. Buffer air pump;

[0044] 6. Limit plate; 7. Lifting cylinder. DETAILED DESCRIPTION

[0045] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0046] The purpose of the embodiments of the present invention is to solve the problem that the existing technology cannot locate the specific cause of the differential 1 gear set failure. The traditional detection method can only determine whether the differential 1 gear set has failed, but cannot identify the cause, which makes it difficult to specifically troubleshoot the failure during maintenance or production. Therefore, it is necessary to solve the problem that the cause of the differential 1 gear set failure cannot be determined at a fixed point, and conventional torque detection cannot eliminate the problem that the differential 1 failure is caused by deformation or overheating at other points of the differential 1 gear set.

[0047] refer to Figure 1 、 3 6. An embodiment of the present invention discloses a performance detection device for a differential 1, wherein the differential 1 to be detected includes a planetary gear 11 and a bevel gear 12 meshing therewith, and lubricating oil is present at the meshing portion between the planetary gear 11 and the bevel gear 12. The performance detection device is used to detect the meshing clearance between the planetary gear 11 and the bevel gear 12, and includes a detection terminal 111 connected to the axial end face of the planetary gear 11; a detector 2, which is arranged opposite to the detection terminal 111; a displacement sensor 21 is provided on the surface of the detector 2 facing the detection terminal 111; the surface of the displacement sensor 21 of the detector 2 is in contact with the detection terminal 111, and the axial pressure of the two in contact is zero; a driving part 3, which is used to drive the bevel gear 12 to rotate; a processor, which is connected to the displacement sensor 2 1 connection; the moment when the driving unit 3 drives the bevel gear 12 to rotate is counted as the first moment, and after the bevel gear 12 rotates, the power is transmitted to the planetary gear 11 through rotational meshing. The displacement sensor 21 is used to detect whether the planetary gear 11 is rotating, and the moment when the displacement sensor 21 feedbacks the signal is counted as the second moment. The meshing clearance is detected according to the first moment and the second moment. The detector 2 is provided with a detection end face 22, and the displacement sensor 21 is fixed on the surface of the detection end face 22; the detection end face 22 is also provided with a vibration sensor 23. When the planetary gear 11 rotates under the drive of the bevel gear 12, the vibration sensor 23 generates instantaneous feedback for the axial offset movement of the planetary gear 11; the second moment is determined based on the feedback results of the vibration sensor 23 and the displacement sensor 21.

[0048] refer to Figure 1 、 36. The detection mechanism of the present invention is provided with a detection table, and the relevant detection equipment is mainly fixed on the table surface of the detection table. The end of the planetary gear 11 is provided with a detection terminal 111, and the detection terminal 111 is connected to the axial end face of the planetary gear 11 and rotates with the planetary gear 11 itself. A rod-shaped detector 2 is also fixed on the detection table. The rod-shaped detector 2 is divided into an upper and a lower part, wherein the bottom detector 2 is fixed on the detection table surface. When the differential 1 to be detected is placed, the detection terminal 111 at the bottom of the differential 1 will contact the surface of the detector 2 and maintain the axial pressure between the two to be zero, wherein the end of the rod-shaped detector 2 is provided The detection end surface 22 is a plane, and a displacement sensor 21 and a vibration sensor 23 are fixed on the surface respectively. The target data detected by the displacement sensor 21 is the rotation of the detection terminal 111. When the detection terminal 111 rotates, an electrical signal is transmitted to the displacement sensor 21, and the electrical signal is transmitted to the processor for recording. The target data detected by the vibration sensor 23 is the axial vibration signal transmitted when the detection terminal 111 rotates. When it vibrates, it transmits the electrical signal synchronously with the displacement sensor 21. The electrical signal is transmitted to the operation screen coordinated with the vibration sensor 23 for judgment by the staff.

[0049] refer to Figure 1 、 3 6. The main function of the vibration sensor 23 is to detect whether there is a friction imbalance caused by loose installation or mechanical loss between the planetary gear 11 and the fixed structure inside the differential 1 during its rotation, which in turn causes the longitudinal offset of the planetary gear 11 during its rotation. Only by eliminating this problem can the measurement accuracy of the displacement sensor 21 be improved.

[0050] refer to Figure 4 、 5 , the width of the gap between the planetary gear 11 and the bevel gear 12 is the tooth pitch. Taking the rotation time of the driving part 3 as the benchmark, the benchmark time is the first moment. When the bevel gear 12 rotates so that its tooth wall contacts the tooth wall of the planetary gear 11, the planetary gear 11 rotates and drives the detection terminal 111 to rotate synchronously. This time is the second moment. The difference between the second moment and the first moment is the result obtained as the measured time difference. For the connection structure of the planetary gear 11 and the bevel gear 12 built into the standard differential 1, the result obtained by the same measurement method can be recorded as the standard time difference. The linkage structure of the standard planetary gear 11 and the bevel gear 12 itself has dimensional errors in the manufacturing process. According to the maximum and minimum values ​​of its dimensional errors, the fluctuation range of the marked time difference can be measured respectively. When there is a numerical fluctuation between the measured time difference and the standard time difference, and the fluctuation size exceeds the standard fluctuation range, it can be proved that there is a problem with the tooth pitch of the gear structure.

[0051] refer to Figure 2The device also includes a heating mechanism 4, which is used to heat the lubricating oil so that it is in a fluid state during the detection process. The heating mechanism 4 includes an electric heating wire 41, which is an iron-chromium-aluminum heating wire. The surface of the detector 2 is coated with an aluminum foil coating.

[0052] refer to Figure 2 A heating mechanism 4 is also provided on the test bench. There are two situations in which the pitch problem occurs. One is that there is a lubricating oil condensate in the gap between the planetary gear 11 and the bevel gear 12, which will cause the pitch detection to fail. The other is that the planetary gear 11 itself is deformed, resulting in a change in the pitch. Therefore, it is necessary to distinguish. After the above test is completed, if it has been determined that the fault of the differential 1 is a pitch out-of-tolerance, it is necessary to determine which part of the pitch problem is caused without disassembling the differential 1 gear set. Therefore, a heating mechanism 4 is provided. The heating mechanism 4 can melt the lubricating oil condensate. During the test process, the measured time difference obtained by the above test results is subjected to a secondary test after heating for a period of time. If the value of the measured time difference obtained thereafter fluctuates significantly, the pitch problem is caused by the condensation of the lubricating oil, and the gap between the planetary gear 11 and the bevel gear 12 can be cleaned subsequently. Otherwise, the value of the measured time difference does not change much, then the pitch problem is caused by the deformation of the planetary gear 11, and the planetary gear 11 needs to be replaced subsequently.

[0053] refer to Figure 2 The heating mechanism 4 adopts an electric heating wire 41 made of iron-chromium-aluminum material. The electric heating wire 41 of iron-chromium-aluminum material can be heated to 200 degrees Celsius when powered on. The melting point of condensed lubricating oil is 100 degrees Celsius, which can quickly melt the condensed lubricating oil. The point heating wire is placed in the heating cavity at the bottom of the test bench. Several through holes are opened on the heating cavity to penetrate the test bench and face the surface of the placed differential 1 to heat the differential 1 at high temperature. Aluminum foil thermal insulation coating is applied to the surface of the detector 2 to prevent the displacement sensor 21 and vibration sensor 23 on the surface of the detector 2 from malfunctioning at high temperatures.

[0054] refer to Figure 7 The device also includes a telescopic rod 51, which is used to drive the detector 2 toward or away from the detection terminal 111; the device also includes a support part 5, which includes a buffer air pump 53 and a contour block 52 connected to the buffer air pump 53; the contour block 52 is used to place the differential 1; a pressure sensor, which is fixed on the detector 2 and is signal-connected to the buffer air pump 53, and the pressure sensor is used to detect the pressure value transmitted to the detector 2 by the gravity of the differential 1 when the differential 1 is placed on the contour block 52; wherein, when the telescopic rod 51 drives the detector 2 to contact the detection terminal 111, the buffer air pump 53 supports the differential 1 and adjusts the telescopic distance so that the axial pressure between the detector 2 and the surface of the detection terminal 111 is kept at zero.

[0055] refer to Figure 7 The upper detector 2 and the lower detector 2 are linked by the telescopic function of the telescopic rod 51. The end of the upper detector 2 is opposite to the end of the lower detector 2. The distance between the upper and lower detectors 2 is adjusted by driving the upper detector 2, thereby adapting to differentials 1 of different specifications.

[0056] refer to Figure 7 A support portion 5 for placing the differential 1 is also provided, which does not include a buffer air pump 53 and a contoured block 52 connected to the buffer air pump 53. The contoured block 52 is provided with a contoured groove that matches the drive side shaft on the differential 1 to ensure that the differential 1 is placed stably.

[0057] refer to Figure 7 In another embodiment, a pressure sensor is fixed to the bottom end of the bottom detector 2, and the pressure sensor and the buffer air pump 53 are connected by an electrical signal. When the differential 1 is placed, the pressure sensor at the bottom measures the pressure of the differential 1 on the detector 2 under the condition of the conflict between the differential 1 and the detector 2, thereby transmitting the data to the pressure sensor. The pressure sensor transmits a signal to the buffer air pump 53, driving the buffer air pump 53 to rise or fall. The buffer air pump 53 moves to the moment when the pressure measured by the pressure sensor is zero and stops. At this time, the displacement sensor 21 and the vibration sensor 23 at the end of the detector 2 just conflict with the end face of the detection terminal 111, reducing the pressure on the surface of the displacement sensor 21 and the vibration sensor 23 to prevent detection errors.

[0058] refer to Figure 7 The driving part 3 includes a driving source 31 and a fixing collar 32 connected to the power output end of the driving source 31. A threaded hole 321 is provided on the outer wall of the fixing collar 32. A fixing nut is threadedly connected to the inner surface of the threaded hole 321. The driving part 3 also includes a horizontal slide 33 extending toward the placement direction of the differential 1; a placement platform 34, which is slidably connected to the horizontal slide 33, and the driving source 31 is fixed on the placement platform 34.

[0059] refer to Figure 7The driving part 3 can be fixed to the driving side shaft to drive the driving side shaft to rotate. It includes a driving source 31 and a fixing collar 32 fixed to the power output end of the driving source 31. The driving source 31 adopts a stepping motor. The power output end of the stepping motor is fixed with a fixing collar 32 supported by industrial rubber. It has elastic deformation performance. When it is sleeved on the driving side shaft, the inner wall will squeeze the surface of the driving side shaft and can fix the surface of the driving side shaft by elastic force. A threaded hole 321 is opened on the outer wall of the fixing collar 32, and the internal thread is connected to the fixing nut. When the fixing collar 32 is sleeved on the surface of the driving side shaft, tightening the fixing nut can enhance the fixing effect. When the power output end of the driving source 31 rotates, the driving side shaft will be driven to rotate synchronously through the fixing effect of the fixing collar 32.

[0060] refer to Figure 7 A horizontal slide 33 extending toward the placement direction of the differential 1 is also provided on the detection table. A placement platform 34 is slidably connected to the horizontal slide 33. The bottom of the placement platform 34 is rotatably connected to a pulley and can move along the length direction of the horizontal slide 33. The driving source 31 is fixed on the placement platform 34 and can be pushed by the operator to make the fixing ring 32 engage with the driving measuring shaft to realize the switching between the fixed and contact fixed states.

[0061] refer to Figure 7 The device also includes a limit plate 6, which is provided with a limit groove that matches the shape of the placement groove of the profiling block 52; a lifting cylinder 7, whose power output end is fixed to the limit plate 6, driving the limit plate 6 to move closer to or away from the surface of the profiling block 52.

[0062] refer to Figure 7 On the other side of the detection platform, a fixed base is provided, which is slidably connected to a limit plate 6 on the fixed base. The limit plate 6 slides along the vertical slide groove opened on the fixed base. A limit groove is opened on the limit plate 6, and the limit groove matches the shape of the placement groove body on the profiling block 52. When the differential 1 is placed on the profiling block 52, the shape of the placement groove body and the shape of the limit groove are combined to form the cross-sectional shape of the driving side shaft of the differential 1. When the driving limit plate 6 moves toward the side shaft of the differential 1 and conflicts with the surface of the profiling block 52, the surface of the driving side shaft of the differential 1 contacts the profiling groove body of the profiling block 52 and the inner wall of the limit groove, so that when the driving side shaft rotates, the vibration generated will not drive the driving side shaft to move in the vertical direction and affect the detection result. The movement driving source 31 of the limit plate 6 toward or away from the profiling block 52 is a lifting cylinder 7 fixed on the detection platform, which drives its vertical movement through the end of the piston rod of the lifting cylinder 7.

[0063] The differential 1 performance detection device described in the present invention has the following working process: when an abnormal sound occurs during the use of the automobile differential 1 and it is disassembled for detection, the differential 1 to be detected is placed on the profiling block 52, the differential 1 is straightened, and its upper and lower planetary gears 11 are respectively located at the top and bottom and are directly opposite the detector 2 at the upper end and the detector 2 at the lower end. The bottom planetary gear 11 and the detector 2 surface are in conflict, the detector 2 at the upper end is pressed to make it conflict with the surface of the upper planetary gear 11, the driving part 3 is pushed to make the fixing collar 32 fit on the surface of the driving measuring rod, the fixing nut is tightened, the driving source 31 is started, and the time is recorded at the moment the driving source 31 is energized. This time is the first moment. The driving side shaft rotates and the planetary gear 11 rotates accordingly. The time is recorded once when the planetary gear 11 rotates from stationary to rotating. This time is the second moment. Through the second moment and the first moment, the time is recorded. The difference is used to determine whether the tooth pitch of the planetary gear 11 of the differential 1 has changed. If it exceeds the normal time range, the heat source is energized to heat the differential 1 area for 5-10 minutes, and the drive source 31 is started again. The time when the drive source 31 is started and the time when the planetary gear 11 rotates are recorded again, and the difference between the two times is calculated. If the difference between the two times does not fluctuate significantly within the standard range, the tooth pitch problem of the planetary gear 11 of the differential 1 is caused by the deformation of the planetary gear 11 itself, and the planetary gear 11 of the differential 1 needs to be replaced. If the difference between the two times changes significantly, the tooth pitch problem of the planetary gear 11 is caused by the condensation of the lubricating oil. The high temperature will cause some of the condensed blocks of the lubricating oil to melt, resulting in a large error in the tooth pitch. At this time, it is only necessary to clean the planetary gear 11 and replace the lubricating oil, thereby achieving the effect of troubleshooting the cause of the tooth pitch problem of the differential 1.

[0064] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A differential performance testing device, wherein the differential includes a planetary gear and a bevel gear meshing therewith, wherein lubricating oil is present at the meshing portion between the planetary gear and the bevel gear, and wherein: The performance detection device is used to detect the meshing clearance between the planetary gear and the bevel gear, and includes: a detection terminal connected to an axial end face of the planetary gear; A detector is arranged facing the detection terminal; a displacement sensor is arranged on a surface of the detector facing the detection terminal; a surface of the detector on which the displacement sensor is arranged abuts against the detection terminal, and an axial pressure between the two abutting against each other is zero; A driving unit, which is used to drive the bevel gear to rotate; a processor connected to the displacement sensor; the instant when the driving unit drives the bevel gear to rotate is counted as a first moment; after the bevel gear rotates, power is transmitted to the planetary gear through rotational meshing; the displacement sensor is used to detect whether the planetary gear rotates, and the instant when the displacement sensor feedback signal is counted as a second moment; the meshing clearance is detected based on the first moment and the second moment; The device further comprises a heating mechanism, wherein the heating mechanism is used to heat the lubricating oil so that the lubricating oil is in a fluid state during the detection process; A detection end face is provided on the detector, and the displacement sensor is fixed on the surface of the detection end face; a vibration sensor is also provided on the detection end face, and when the planetary gear rotates under the drive of the bevel gear, the vibration sensor generates instantaneous feedback for the axial offset movement of the planetary gear; the second moment is determined based on the feedback results of both the vibration sensor and the displacement sensor.

2. The differential performance detection device according to claim 1, characterized in that: The heating mechanism comprises an electric heating wire, and the electric heating wire is an iron-chromium-aluminum heating wire.

3. The differential performance detection device according to claim 1, characterized in that: The detector surface is coated with an aluminum foil coating.

4. The differential performance detection device according to claim 1, characterized in that: The device also includes a telescopic rod, which is used to drive the detector to move closer to or away from the detection terminal.

5. The differential performance detection device according to claim 4, characterized in that: The device further comprises, A support portion, comprising a buffer air pump and a shaped block connected to the buffer air pump; the shaped block is used to place the differential; a pressure sensor fixed to the detector and connected to the buffer air pump signal, the pressure sensor being used to detect the pressure value transmitted to the detector by the gravity of the differential when the differential is placed on the contoured block; When the telescopic rod drives the detector to contact the detection terminal, the buffer air pump supports the differential and adjusts the telescopic distance so as to keep the axial pressure between the detector and the surface of the detection terminal continuously at zero.

6. The differential performance detection device according to claim 1, characterized in that: The driving part includes a driving source and a fixing collar connected to a power output end of the driving source. A threaded hole is provided on an outer wall of the fixing collar, and a fixing nut is threadedly connected in the threaded hole.

7. The differential performance detection device according to claim 6, characterized in that: The driving unit further includes: a horizontal slideway extending toward the placement direction of the differential; The placing platform is slidably connected to the horizontal slideway, and the driving source is fixed on the placing platform.

8. The differential performance detection device according to claim 5, characterized in that: The device further comprises, A limiting plate, wherein the limiting plate is provided with a limiting groove matching the shape of the placement groove of the profiling block; The lifting cylinder has a power output end fixed to a limit plate, driving the limit plate to move toward or away from the differential.

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