Differential performance detection device

Abstract

The invention relates to a differential performance detection device, which belongs to the technical field of differential detection, and comprises a detection terminal connected with the axial end face of a planetary gear; the detector is arranged opposite to the detection terminal; a displacement sensor is arranged on the surface, facing the detection terminal, of the detector; the detector is provided with the surface of the displacement sensor to abut against the detection terminal, and the axial pressure of abutting between the detector and the detection terminal is zero. The driving part is used for driving the bevel gear to rotate; the processor is connected with the displacement sensor; the moment when the driving part drives the bevel gear to rotate is the first moment, the bevel gear transmits power to the planetary gear through rotating meshing after rotating, the displacement sensor is used for detecting whether the planetary gear rotates or not, the moment when the displacement sensor feeds back signals is the second moment, and the meshing clearance is detected according to the first moment and the second moment. Whether the tooth pitch of the differential mechanism is out of tolerance or not can be judged, and the accurate positioning effect of differential mechanism fault detection is achieved.

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 steering stability and power distribution efficiency of the vehicle. With the complex working conditions of new energy vehicles, the reliability requirements for differentials have increased.

[0003] Due to the high torque characteristics of the motor in the differential of new energy vehicles, the planetary gears are often faced with transient impact loads. Therefore, the planetary gears will have torque fatigue and fail. Although traditional detection mechanisms can simulate torsional fatigue to determine whether the differential gear set fails, they lack the ability to dynamically capture the microscopic tooth surface stress distribution. The occurrence of faults in the differential may be caused by various reasons such as the pitch between the planetary gear and the bevel gear or structural deformation. Torque detection cannot exclude differential faults caused by deformation or overheating at other points of 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 problem in the prior art that the specific reasons for the failure of the differential gear set cannot be accurately identified. Therefore, a differential performance detection device is provided, which can judge the reasons for the pitch deviation of the differential, detect the pitch between the planetary gear and the bevel gear, and achieve accurate positioning of the differential fault detection.

[0005] To solve the above technical problems, the present invention provides a differential performance detection device. The differential includes a planetary gear and a bevel gear meshed therewith. There is lubricating oil at the meshing part of the planetary gear and the bevel gear. The characteristics are as follows: This performance detection device is used to detect the meshing clearance between the planetary gear and the bevel gear, and it includes, Detection terminals, which are connected to the axial end face of the planetary gear; A detector, which is arranged opposite to the detection terminal; a displacement sensor is arranged on the surface of the detector facing the detection terminal; the surface of the detector where the displacement sensor is arranged abuts against the detection terminal, and the axial pressure between the two when abutting 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 moment when the driving part drives the bevel gear to rotate is recorded as the 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 moment when the displacement sensor feeds back a signal is recorded as the second moment. The meshing clearance is detected according to the first moment and the second moment.

[0006] In one embodiment of the present invention, the device further includes a heating mechanism for heating the lubricating oil to make it in a fluid state during the detection process.

[0007] In one embodiment of the present invention, the heating mechanism includes an electric heating wire, and the electric heating wire adopts an iron-chromium-aluminum electric heating wire.

[0008] In one embodiment of the present invention, the surface of the detector is coated with an aluminum foil layer.

[0009] In one embodiment of the present invention, 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. When the planetary gear rotates under the drive of the bevel gear, the vibration sensor generates an instantaneous feedback for the axial offset movement of the planetary gear; the second moment is determined according to the feedback results of both the vibration sensor and the displacement sensor.

[0010] In one embodiment of the present invention, the device further includes a telescopic rod for driving the detector to approach or move away from the detection terminal.

[0011] In one embodiment of the present invention, the device further includes a support part including a buffer air pump and a profiling block connected to the buffer air pump; the profiling block is used for placing the differential; a pressure sensor fixed on the detector and signal-connected to the buffer air pump. The pressure sensor is used for detecting the pressure value transmitted from the gravity of the differential to the detector when the differential is placed on the profiling block; wherein, when the telescopic rod drives the detector to contact the detection terminal, the buffer air pump supports the differential and adjusts the telescopic distance to keep the axial pressure on the surface of the detector and the detection terminal continuously zero.

[0012] In one embodiment of the present invention, the driving part includes a driving source and a fixed collar connected to the power output end of the driving source. Threaded holes are provided on the outer wall of the fixed collar, and fixing nuts are threadedly connected in the threaded holes.

[0013] In one embodiment of the present invention, the driving part further includes a horizontal slideway extending in the placement direction of the differential; a placement table slidably connected in the horizontal slideway, and the driving source is fixed on the placement table.

[0014] In one embodiment of the present invention, the device further includes 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, and drives the limit plate to move closer to or away from the surface of the profiling block.

[0015] The above technical solution of the present invention has the following beneficial effects compared with the prior art: A differential performance detection device described in the present invention is configured to perform fixed-point detection on the planetary gears of the differential, and 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 pitch difference between the planetary gears and the bevel gears.

[0016] The detection of the planetary gear detection terminal is carried out by means of a 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 surface of the planetary gear is displaced, the displacement sensor transmits an electrical signal to the processor, so that the time for the driving unit to drive the planetary gear to rotate is used to determine whether the tooth pitch of the planetary gear is out of tolerance. 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. The time difference between the first moment and the second moment is recorded as the measured time difference, and then compared 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 is within the normal fluctuation range. On this basis, the cause of the differential gear set failure is determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a schematic diagram of the overall structure of the device in a preferred embodiment of the present invention; Figure 2 For the present invention Figure 1 Schematic cross-section of some structures; Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 It is a cross-sectional schematic diagram of the pitch display structure of the dual gear set; Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle; Figure 6 It is a partial structural schematic diagram of the detector in the present invention; Figure 7 Schematic diagram of the overall structure of the device in the preferred embodiment of the present invention Figure 2 .

[0019] Explanation of reference numerals in the accompanying drawings of the specification: 1. Differential; 11. Planet gear; 111. Detection terminal; 12. Bevel gear; 2. Detector; 21. Displacement sensor; 22. Detection end face; 23. Vibration sensor; 3. Driving part; 31. Driving source; 32. Fixed collar; 321. Threaded hole; 33. Horizontal slideway; 34. Placing table; 4. Heating mechanism; 41. Electric heating wire; 5. Support part; 51. Telescopic rod; 52. Profiled block; 53. Buffer air pump; 6. Limiting plate; 7. Lifting cylinder. Specific implementation mode

[0020] The following further illustrates the present invention in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the illustrated embodiments are not intended to limit the present invention.

[0021] The purpose of the embodiment of the present invention is that in the prior art, it is impossible to locate the specific cause of the failure of the gear set of the differential 1. The traditional detection method can only judge whether the gear set of the differential 1 fails, but cannot identify its cause, resulting in difficulty in specifically eliminating faults during maintenance or production. Therefore, it is necessary to solve the problem of being unable to determine the cause of the failure of the gear set of the differential 1 at a fixed point, and the conventional torque detection cannot rule out the deformation or overheating of other points of the gear set of the differential 1 that cause the failure of the differential 1.

[0022] Refer to Figure 1 , 3, 6, an embodiment of the present invention discloses a differential 1 performance detection device. The differential 1 to be detected includes a planetary gear 11 and a bevel gear 12 meshing therewith. There is lubricating oil at the meshing portion of the planetary gear 11 and the bevel gear 12. This performance detection device is used to detect the meshing clearance between the planetary gear 11 and the bevel gear 12, and it includes a detection terminal 111 which is 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 arranged on the surface of the detector 2 facing the detection terminal 111; the surface of the detector 2 where the displacement sensor 21 is arranged abuts against the detection terminal 111, and the axial pressure between the two when abutting 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 21; the moment when the driving part 3 drives the bevel gear 12 to rotate is recorded as the first moment. After the bevel gear 12 rotates, power is transmitted to the planetary gear 11 through rotational meshing. The displacement sensor 21 is used to detect whether the planetary gear 11 rotates, and the moment when the displacement sensor 21 feeds back a signal is recorded as the second moment. The meshing clearance is detected according to the first moment and the second moment. A detection end face 22 is arranged on the detector 2, and the displacement sensor 21 is fixed on the surface of the detection end face 22; a vibration sensor 23 is also arranged on the detection end face 22. When the planetary gear 11 rotates under the drive of the bevel gear 12, the vibration sensor 23 generates an instantaneous feedback for the axial offset movement of the planetary gear 11; the second moment is determined according to the feedback results of the vibration sensor 23 and the displacement sensor 21.

[0023] Reference Figure 1 , 3 , 6, the detection mechanism of the present invention is provided with a detection table. Relevant detection equipment is mainly fixed on the tabletop of the detection table. A detection terminal 111 is arranged at the end of the planetary gear 11. 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 upper and lower parts. The bottom detector 2 is fixed on the tabletop of the detection table. When the differential 1 to be detected is placed, the detection terminal 111 at the bottom of the differential 1 will abut against the surface of the detector 2 and maintain the axial pressure between the two at zero. The end of the rod-shaped detector 2 is provided with a detection end face 22. The detection end face 22 is a plane, and a displacement sensor 21 and a vibration sensor 23 are respectively fixed on the surface. The target data detected by the displacement sensor 21 is the rotation of the detection terminal 111. When the detection terminal 111 rotates, it will transmit an electrical signal to the displacement sensor 21, and its electrical signal is sent 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 an electrical signal synchronously with the displacement sensor 21. This electrical signal is transmitted to an operation screen that cooperates with the vibration sensor 23 for the staff to judge.

[0024] ReferenceFigure 1 , 3 , the main function of the vibration sensor 23 is to detect whether there is an unsteady installation or a friction imbalance caused by mechanical loss between the planetary gear 11 and the fixed structure inside the differential 1 during the rotation of the planetary gear 11, which may lead to a longitudinal offset problem when the planetary gear 11 rotates. Only by eliminating this problem can the measurement accuracy of the displacement sensor 21 be improved.

[0025] Reference Figure 4 , 5 , the gap width between the planetary gear 11 and the bevel gear 12 is the tooth pitch. Based on the rotation time of the driving part 3, this reference time is the first moment. When the bevel gear 12 rotates and 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 result obtained by the difference between the second moment and the first moment is the measurement time difference. For the connection structure of the planetary gear 11 and the bevel gear 12 built in the standard differential 1, the result obtained by the same measurement method can be recorded as the standard time difference. Moreover, for the linkage structure of the standard planetary gear 11 and the bevel gear 12, there are 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 magnitude exceeds the standard fluctuation range, it can be proved that there is a problem with the tooth pitch of this gear structure.

[0026] Reference Figure 2 , this device further includes a heating mechanism 4. The heating mechanism 4 is used to heat the lubricating oil to make it in a fluid state during the detection process. The heating mechanism 4 includes an electric heating wire 41. The electric heating wire 41 uses an iron-chromium-aluminum electric heating wire, and the surface of the detector 2 is coated with an aluminum foil layer.

[0027] Reference Figure 2, a heating mechanism 4 is also provided on the detection table. Since there are two situations in the formation of the pitch problem, one is that there is a condensate block of lubricating oil in the gap between the planetary gear 11 and the bevel gear 12, which will cause a failure in pitch detection, and the other is that the pitch changes due to the deformation of the planetary gear 11 itself. Therefore, it is necessary to make a distinction. After the above detection, when it has been determined that the failure of the differential 1 is an out-of-tolerance pitch, it is necessary to determine which part of the pitch problem is composed without disassembling the gear set of the differential 1. Therefore, the heating mechanism 4 is provided. The heating mechanism 4 can melt the condensate block of lubricating oil. During the detection process, after heating for a period of time, a secondary detection is carried out based on the measured time difference obtained from the above detection results. If the value of the measured time difference obtained later shows a relatively obvious fluctuation, the pitch problem is caused by the condensation of lubricating oil, and subsequently, the gap between the planetary gear 11 and the bevel gear 12 can be cleaned. On the contrary, if the change in the value of the measured time difference is small, the pitch problem is caused by the deformation of the planetary gear 11, and the planetary gear 11 needs to be replaced later.

[0028] Reference Figure 2 , the heating mechanism 4 adopts an electric heating wire 41 made of FeCrAl material. The electric heating wire 41 made of FeCrAl material can heat up to 200 degrees Celsius when powered on. The melting point of the lubricating oil condensate is 100 degrees Celsius, and it can quickly melt the condensate of the lubricating oil. The electric heating wire is placed in the heating cavity at the bottom of the detection table. A number of through holes are opened on the heating cavity to penetrate the detection table and face the surface of the placed differential 1 to perform high-temperature heating on the differential 1. An aluminum foil heat insulation layer is coated on the surface of the detector 2 so that the displacement sensor 21 and the vibration sensor 23 on the surface of the detector 2 will not malfunction at high temperatures.

[0029] Reference Figure 7 , the device further includes a telescopic rod 51, which is used to drive the detector 2 to approach or move away from the detection terminal 111; the device further includes a support part 5, which includes a buffer air pump 53 and a profiling block 52 connected to the buffer air pump 53; the profiling 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. The pressure sensor is used to detect the pressure value transmitted from the gravity of the differential 1 to the detector 2 when the differential 1 is placed on the profiling 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 as to keep the axial pressure on the surface of the detector 2 and the detection terminal 111 continuously zero.

[0030] Reference Figure 7, the detector 2 in the upper part and the detector 2 in the lower part are linked through the telescopic function of the telescopic rod 51. The ends of the detector 2 in the upper part and the detector 2 in the lower part are opposite to each other. By driving the detector 2 in the upper part, the distance between the two detectors 2 in the upper and lower parts is adjusted, so as to adapt to different specifications of the differential 1.

[0031] Reference Figure 7 , a support part 5 for placing the differential 1 is also provided. It is made without including the buffer air pump 53 and the profiling block 52 connecting the buffer air pump 53. The profiling block 52 is provided with a profiling groove body, which is matched with the driving side shaft on the differential 1 to ensure the stable placement of the differential 1.

[0032] Reference Figure 7 , in another embodiment, a pressure sensor is fixed at the bottom end of the detector 2 at the bottom. 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 when the differential 1 and the detector 2 are in contact, so as to transmit data to the pressure sensor. The pressure sensor transmits a signal to the buffer air pump 53 to drive the buffer air pump 53 to rise or fall. The buffer air pump 53 stops moving when the pressure measured by the pressure sensor is zero. At this time, the displacement sensor 21 and the vibration sensor 23 at the end of the detector 2 just contact the end face of the detection terminal 111, reducing the pressure on the surfaces of the displacement sensor 21 and the vibration sensor 23 to prevent detection errors.

[0033] Reference Figure 7 , the driving part 3 includes a driving source 31 and a fixed 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 fixed collar 32, and a fixed nut is threadedly connected in the threaded hole 321. It also includes a horizontal slideway 33 extending in the placing direction of the differential 1; a placing table 34, which is slidably connected in the horizontal slideway 33, and the driving source 31 is fixed on the placing table 34.

[0034] Reference Figure 7 , the driving part 3 can drive the driving side shaft to rotate by being fixed to the driving side shaft. It includes a driving source 31 and a fixed collar 32 fixed to the power output end of the driving source 31. The driving source 31 adopts a stepping motor, and the power output end of the stepping motor is fixed with a fixed collar 32 supported by industrial rubber, which has elastic deformation performance. When sleeved on the driving side shaft, the inner wall will squeeze the surface of the driving side shaft and can fix and suck the surface of the driving side shaft by elastic force. A threaded hole 321 is provided on the outer wall of the fixed collar 32, and a fixed nut is threadedly connected. When the fixed collar 32 is sleeved on the surface of the driving side shaft, tightening the fixed nut can strengthen the fixing effect. When the power output end of the driving source 31 rotates, it will drive the driving side shaft to rotate synchronously through the fixing effect of the fixed collar 32.

[0035] refer to Figure 7 A horizontal slide 33 extending toward the placement direction of the differential 1 is also provided on the detection table surface, and 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 the operator can push the fixing ring 32 to buckle on the driving measuring shaft to realize the switching between the fixed state and the contact fixed state.

[0036] refer to Figure 7 The device also includes a limit plate 6, on which a limit groove matching the shape of the placement groove of the profiling block 52 is opened; 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.

[0037] refer to Figure 7 On the other side of the detection platform, a fixed base is provided, on which a limiting plate 6 is slidably connected, and the limiting plate 6 slides along the vertical slide groove provided on the fixed base, and a limiting groove is provided on the limiting plate 6, and the limiting 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 limiting groove are combined to form the cross-sectional shape of the driving side shaft of the differential 1. When the driving limiting 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 limiting 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 to affect the detection result. The movement driving source 31 of the limiting plate 6 toward or away from the profiling block 52 is a lifting cylinder 7 fixed on the detection table, and its vertical movement is driven by the end of the piston rod of the lifting cylinder 7.

[0038] 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 the differential 1 is disassembled for detection, the differential 1 to be detected is placed on the profiling block 52, the differential 1 is aligned, and its upper and lower planetary gears 11 are respectively located at the upper and lower ends and are directly opposite to the detector 2 located at the upper end and the detector 2 located at the lower end, the planetary gear 11 at the bottom is in contact with the surface of the detector 2, the detector 2 located at the upper end is pressed to make it contact with the surface of the planetary gear 11 at the upper end, the driving part 3 is pushed to make the fixing collar 32 sleeved 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 when the driving source 31 is powered on, which is the first moment, the driving side shaft rotates, and the planetary gear 11 rotates accordingly, and the time is recorded once when the planetary gear 11 rotates from stationary to rotating, which is the second moment, and the second moment and the first moment are compared. The difference is used to determine whether the 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 produce a large fluctuation within the standard range, the 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 greatly, the pitch problem of the planetary gear 11 is caused by the condensation of the lubricating oil. The high temperature will cause part of the condensed blocks of the lubricating oil to melt, resulting in a large change in the pitch error. 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 pitch problem of the differential 1.

[0039] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A differential performance detection device, the differential includes a planetary gear and a bevel gear meshing therewith, and there is lubricating oil at the meshing portion of the planetary gear and the bevel gear, and it is characterized in that: The performance detection device is used to detect the meshing clearance between the planetary gear and the bevel gear, and it includes a detection terminal, which is connected to the axial end face of the planetary gear; a detector, which is arranged opposite to the detection terminal; a displacement sensor is arranged on the surface of the detector facing the detection terminal; the surface of the detector where the displacement sensor is arranged abuts against the detection terminal, and the axial pressure between the two when they abut 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 moment when the driving part drives the bevel gear to rotate is recorded as the 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 moment when the displacement sensor feeds back a signal is recorded as the second moment, and the meshing clearance is detected according to the first moment and the second moment.

2. The differential performance detection device according to claim 1, wherein: The device further includes a heating mechanism, and the heating mechanism is used to heat the lubricating oil so that it is in a fluid state during the detection process.

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

4. A differential performance detection device according to claim 2, characterized in that: The surface of the detector is coated with an aluminum foil layer.

5. A differential performance detection device according to claim 1, characterized in that: A detection end face is arranged on the detector, and the displacement sensor is fixed on the surface of the detection end face; a vibration sensor is also arranged on the detection end face. When the planetary gear rotates driven by the bevel gear, the vibration sensor generates an instantaneous feedback for the offset movement of the planetary gear in the axial direction; the second moment is determined according to the feedback results of the vibration sensor and the displacement sensor.

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

7. The differential performance detection device according to claim 6, characterized in that: The device further includes a support part, which includes a buffer air pump and a profiling block connected to the buffer air pump; the profiling block is used to place the differential; a pressure sensor, which is fixed on the detector and is signal-connected to the buffer air pump. The pressure sensor is used to detect the pressure value transmitted from the gravity of the differential to the detector when the differential is placed on the profiling block; wherein, when the telescopic rod drives the detector to abut against the detection terminal, the buffer air pump supports the differential and adjusts the telescopic distance so that the axial pressure on the surface of the detector and the detection terminal is continuously zero.

8. The differential performance detection device according to claim 1, characterized in that: The driving part includes a driving source and a fixed collar connected to the power output end of the driving source. Threaded holes are formed in the outer wall of the fixed collar, and fixing nuts are threadedly connected in the threaded holes.

9. The differential performance detection device according to claim 8, characterized in that: The driving part further includes a horizontal slideway, which extends in the placement direction of the differential; a placement table, which is slidably connected in the horizontal slideway, and the driving source is fixed on the placement table.

10. A differential performance detection device according to claim 7, characterized in that: The device further includes a limiting plate, and a limiting groove matching the shape of the placement groove of the profiling block is formed in the limiting plate; a lifting cylinder, whose power output end is fixed to the limiting plate, and drives the limiting plate to approach or move away from the differential.

Images