CN220960598U - Differential gear durability testing device - Google Patents

Abstract

The utility model discloses a differential gear durability testing device, which comprises a differential gear testing and fixing box, wherein a differential gear to be tested which is detachably connected with the differential gear testing and fixing box is assembled in the differential gear testing and fixing box, and a left driving testing mechanism and a right driving testing mechanism which are connected with the differential gear to be tested are respectively arranged at the left end and the right end of the differential gear testing and fixing box; the high-level oil injection assembly and the low-level oil injection assembly are respectively arranged on the front side and the rear side of the differential mechanism test fixing box body and in the differential mechanism test fixing box body, and correspond to the high level and the low level meshed with the internal gear of the differential mechanism to be tested respectively; an oil return hole is arranged at the bottom of the differential mechanism test fixed box body, an oil return pipe is connected at the oil return hole in a sealing mode, and the oil return pipe is connected with the lubricating oil pumping and filtering mechanism.

Description

Differential gear durability testing device

Technical Field

The utility model relates to the field of differential testing, in particular to a differential gear durability testing device.

Background

The automobile differential can realize a mechanism for rotating left and right (or front and rear) driving wheels at different rotation speeds. Mainly comprises a left half shaft gear, a right half shaft gear, two planetary gears and a gear rack. The function is to make the left and right wheels roll at different speeds when the automobile turns or runs on uneven road, i.e. to ensure the pure rolling motion of the driving wheels at both sides. In order to ensure the working performance of the developed differential, the differential needs to be tested. In the test, it is necessary to fix the differential in a case in advance, simulate the operating state of the differential in the vehicle in the case, and then perform corresponding performance tests (including, for example, a torque ratio difference test, a rotational speed test, a durability test, etc.) on the differential through various external specific test devices (for example, a torque sensor, a driving motor, a loading motor, etc.).

At present, a testing device for durability testing of an automobile speed reducer gear mainly comprises a differential mechanism testing fixed box, a differential mechanism to be tested is placed in the differential mechanism testing fixed box, a left driving testing mechanism and a right driving testing mechanism which are connected with the differential mechanism to be tested are respectively arranged at the left end and the right end of the testing fixed box, the left driving testing mechanism is provided with a first output half shaft, the right driving testing mechanism is provided with a second output half shaft, and the first output half shaft and the second output half shaft are respectively connected with differential mechanism output half shafts at the left side and the right side of the differential mechanism to be tested. As disclosed in chinese patent application number 201910056862.9, a multi-type differential testing and fixing case is disclosed, comprising a testing and fixing case body; an input shaft which is longitudinally distributed is pivoted between the left end of the front side and the left end of the rear side of the test fixing box body; an input gear is sleeved on the outer wall of the input shaft. When the durability of the gear is tested, the motor power adopted by the input end connected with the output half shaft of the differential mechanism is smaller, the differential mechanism is driven directly through the output half shaft of the input end, and the output and the torque can not meet the test requirement, so that the state of large torque can be achieved by adding one motor and the gear mechanism, the whole test mechanism can realize the test only by three motors, and the structure is complex. To make the structure simpler, the applicant has considered increasing the power of the motors in the two-sided drive test mechanism to simplify the test structure. In addition, when the existing differential mechanism is lubricated, the test fixing box body is directly filled with lubricating oil, and the differential mechanism is completely soaked inside for lubrication. The lubricating mode has good lubricating effect, but in a durability experiment, fragments can be generated after the differential gear is worn for a long time, and if the fragments are not fished out in time after the fragments exist, the differential gear can be worn. Based on this, the applicant intends to change the lubrication mode of the existing endurance test case, to circulate and pump the lubricating oil through a pumping mechanism, to filter the lubricating oil, and to filter out the fragments for lubrication, so as to prevent the fragments from wearing the differential.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide a differential gear durability testing device, which solves the problems that fragments are difficult to salvage, the differential is worn, and the structure of the conventional differential gear durability testing mechanism is complex in the conventional differential gear lubricating mechanism in the conventional testing device.

In order to solve the technical problems, the utility model adopts the following technical scheme:

The utility model provides a differential mechanism gear durability testing arrangement, includes differential mechanism test fixed box, is equipped with the differential mechanism that awaits measuring rather than detachable connection in differential mechanism test fixed box, is equipped with left drive test mechanism and right drive test mechanism that meets with differential mechanism that awaits measuring respectively in differential mechanism test fixed box's left and right ends, left drive test mechanism has first output semi-axis, right drive test mechanism has the second output semi-axis, first output semi-axis and second output semi-axis meet with differential mechanism output semi-axis of awaiting measuring differential mechanism left and right sides respectively; the driving motors in the left driving testing mechanism and the right driving testing mechanism are high-torque motors, a high-position oil injection assembly and a low-position oil injection assembly are respectively arranged on the front side and the rear side of the differential mechanism testing and fixing box body and in the differential mechanism testing and fixing box body, the high-position oil injection assembly and the low-position oil injection assembly respectively correspond to the high position and the low position of the internal gear engagement of the differential mechanism to be tested, the high-position oil injection assembly and the low-position oil injection assembly respectively comprise a plurality of oil injection nozzles, and each oil injection nozzle is connected with a lubricating oil pumping and filtering mechanism outside the differential mechanism testing and fixing box body through a lubricating oil pipe; an oil return hole is arranged at the bottom of the differential mechanism test fixed box body, an oil return pipe is connected at the oil return hole in a sealing mode, and the oil return pipe is connected with the lubricating oil pumping and filtering mechanism. Therefore, after the high-level oil injection assembly and the low-level oil injection assembly are arranged in the differential mechanism test fixing box, the oil injection nozzles on the two assemblies can spray out lubricating oil to the differential mechanism in the box body, oil injection lubrication is carried out on the gear engagement position in the differential mechanism to be tested in the box body, the arranged oil injection assemblies correspond to the high level and the low level of the gear engagement and are connected with the lubricating oil pumping and filtering mechanism, oil is continuously supplied in a pumping mode, and the lubricating oil is sprayed out through the oil injection nozzles, so that the requirements of durability test of the differential mechanism gears can be met. The lubricating oil pumping and filtering mechanism is arranged outside the box body, so that the space of the box body can be effectively saved, and the differential mechanism to be tested is more compact after being assembled. The built-in filter screen in the lubricating oil pumping filter mechanism can filter the lubricating oil pumped from the box body, and the phenomenon that fragments enter the oil nozzle through the lubricating oil pipe is avoided, so that the fragments are prevented from scraping and wearing the differential mechanism. The oil return hole arranged at the bottom of the tank can collect lubricating oil sprayed out of the oil spray nozzle, pumps and filters the lubricating oil through the oil pump in the lubricating oil pumping and filtering mechanism, and achieves the aim of recycling the lubricating oil after the lubricating oil is connected with the oil spray assembly. In addition, the motors adopted in the left driving testing mechanism and the right driving testing mechanism are high-torque motors, and the output torque can reach 6000Nm, so that the high-torque output test can be realized without increasing the torque by a gear mechanism, and the structure of the testing mechanism is simplified.

Further, the differential mechanism testing and fixing box body mainly comprises a main box body and a left cover plate, wherein the left side of the main box body is provided with a concave spigot, a spigot flange plate detachably connected with the main box body is embedded at the spigot, and a plurality of threaded holes for fixedly connecting with the differential mechanism to be tested are formed in the spigot flange plate; the left cover plate is arranged in a spigot of the main box body and is detachably connected with the main box body, and the middle part of the left cover plate and the middle part of a side plate on the right side of the main box body are respectively provided with an assembly hole matched with an output half shaft on the corresponding side of the differential to be tested. Therefore, the differential mechanism testing and fixing box body comprises the left cover plate, the assembly and the support of the differential mechanism are formed through the left cover plate, and the differential mechanism to be tested is positioned through the spigot flange plate, so that the differential mechanism to be tested is fixedly assembled in the differential mechanism testing and fixing box body, and the box body setting structure can facilitate the installation and the disassembly of the differential mechanism to be tested. Specifically, when the differential mechanism is fixed, the spigot flange plate and the differential mechanism to be measured are fixed together, then the differential mechanism to be measured and the spigot flange plate are placed in the main box body together, after the bolts pass through the threaded holes, the differential mechanism to be measured is fixed with the main box body through the spigot flange plate, the differential mechanism to be measured is fixed, and finally, the left cover plate is fixed on the left side of the main box body. When the differential to be tested is disassembled and replaced, the left cover plate on the left side can be disassembled firstly, then the bolts of the flange plate after the disassembly and fixation are disassembled, and the flange plates of the communicating spigot are used for taking out the differential in the main box body together. The middle part of the spigot flange plate is matched with the differential to be tested, so that the differential to be tested can be supported and positioned. According to the difference of differential mechanism model, can correspond to change different tang ring flange adaptation to reach the effect that can adapt to different model differentials and test.

Further, two pin holes are further formed in the spigot flange plate, positioning holes corresponding to the pin holes one to one are formed in the main box body, and the spigot flange plate and the differential to be tested are initially fixed in the main box body after being inserted into the pin holes and the positioning holes through pin shafts. Therefore, before the differential mechanism is placed into the main box body and the spigot flange plate is fixed, the spigot flange plate can be initially positioned through the cooperation of the pin shaft and the pin hole, namely the positioning hole, and meanwhile, after the preliminary positioning of the spigot flange plate is ensured, the accurate spigot flange plate at the position after the differential mechanism to be tested is assembled is concentric with the differential mechanism output half shaft.

Further, a sealing flange plate is respectively arranged on the right side of the main box body and the outer side of the left cover plate, and the middle part of the sealing flange plate is matched with oil seal shafts on the left side and the right side of the differential mechanism to be tested. Like this, sealing flange can seal the oil blanket axle of differential mechanism's output semi-axis for lubricating oil passes through this oil blanket mechanism and realizes sealing, avoids lubricating oil to expose. Meanwhile, after the sealing flange plate is matched with the oil seal, the differential mechanism output shaft can be limited, and larger shaking in the testing process is avoided.

Further, an outwards-protruding connecting protrusion is arranged in the middle of the left cover plate, a connecting ring is formed by outwards protruding the middle of the side plate on the right side of the main box body, the connecting ring and the connecting protrusion are respectively and correspondingly connected with the sealing flange on the corresponding side, and a circle of sealing glue is arranged between the sealing flange and the connecting ring and between the sealing flange and the connecting protrusion. Like this, after left apron and main box right side all outwards protruding, can be with the fine laminating of the sealing flange of corresponding side and be connected, and the sealing gum that sets up can seal sealing flange main box and left apron's junction, avoids lubricating oil excessive.

Furthermore, the differential mechanism test fixing box body is a rectangular box body, an observation window is formed in the upper end face of the differential mechanism test fixing box body, and a transparent sealing cover is detachably arranged at the observation window. Therefore, after the observation window and the transparent sealing cover are arranged, a worker can observe the oil injection condition of the internal oil injection assembly through the observation window at the top conveniently.

Drawings

FIG. 1 is a schematic perspective view of a differential gear durability testing apparatus according to an embodiment;

FIG. 2 is a schematic diagram of an installation cross section of a differential under test with a left drive test mechanism and a right drive test mechanism in an embodiment;

Fig. 3 is a schematic diagram of a split structure of a differential testing fixture case and a spigot flange in an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 3, the durability testing device for the differential gear provided in this embodiment includes a differential testing fixed box, a differential 1 to be tested detachably connected with the differential testing fixed box is assembled in the differential testing fixed box 4, a left driving testing mechanism 2 and a right driving testing mechanism 3 connected with the differential 1 to be tested are respectively arranged at the left end and the right end of the differential testing fixed box 4, the left driving testing mechanism 2 has a first output half shaft, the right driving testing mechanism 3 has a second output half shaft, and the first output half shaft and the second output half shaft are respectively connected with differential output half shafts 11 at the left side and the right side of the differential 1 to be tested; the front side and the rear side of the differential mechanism test fixed box body 4 and the differential mechanism test fixed box body 4 are respectively provided with a high-level oil injection assembly 7 and a low-level oil injection assembly 8, the high-level oil injection assembly 7 and the low-level oil injection assembly 8 respectively correspond to differential mechanism output half shafts 11 on the left side and the right side, the high-level oil injection assembly 7 and the low-level oil injection assembly 8 respectively comprise a plurality of oil injection nozzles, and each oil injection nozzle is connected with a lubricating oil pumping and filtering mechanism outside the differential mechanism test fixed box body 4 through a lubricating oil pipe; an oil return hole 47 is arranged at the bottom of the differential mechanism test fixed box body 4, and an oil return pipe is connected at the oil return hole 47 in a sealing way and is connected with a lubricating oil pumping and filtering mechanism or a lubricating oil storage box. During testing, the driving test mechanism on one side is used as main driving output power, the driving test mechanism on the other side is used as a power output end, and after the driving motor at one end of the output power is started, the internal gear of the differential mechanism is in a continuous working state. The torque force of the internal gear of the differential mechanism is continuously monitored through the sensor, and if the torque force changes greatly after a certain time, the gear is damaged, and the test is finished. Of course, the running state of the differential can be directly observed through a timing point detection mode to judge whether the gear is damaged, and the test is stopped after judging that the gear is damaged.

After the high-position oil injection assembly 7 and the low-position oil injection assembly 8 are arranged in the differential mechanism test fixing box, the oil injection nozzles on the two assemblies can spray out lubricating oil into the box body after the high-position oil injection assembly and the low-position oil injection assembly are arranged in the differential mechanism test fixing box, the oil injection nozzles on the two assemblies can spray out lubricating oil into the differential mechanism in the box body, oil injection lubrication is carried out on the gear meshing position in the differential mechanism to be tested in the box body, the set oil injection assemblies correspond to the high position and the low position of the gear meshing, are connected with a lubricating oil pumping filter mechanism, continuously supply oil in a pumping mode, spray out through the oil injection nozzles, and can meet the requirements of the differential mechanism gear durability test. The lubricating oil pumping and filtering mechanism is arranged outside the box body, so that the space of the box body can be effectively saved, and the differential mechanism to be tested is more compact after being assembled. The built-in filter screen in the lubricating oil pumping filter mechanism can filter the lubricating oil pumped from the box body, and the phenomenon that fragments enter the oil nozzle through the lubricating oil pipe is avoided, so that the fragments are prevented from scraping and wearing the differential mechanism. The oil return hole arranged at the bottom of the tank can collect lubricating oil sprayed out of the oil spray nozzle, pumps and filters the lubricating oil through the oil pump in the lubricating oil pumping and filtering mechanism, and achieves the aim of recycling the lubricating oil after the lubricating oil is connected with the oil spray assembly. In addition, the motors adopted in the left driving testing mechanism and the right driving testing mechanism are high-torque motors, and the output torque can reach 6000Nm, so that the high-torque output test can be realized without increasing the torque by a gear mechanism, and the structure of the testing mechanism is simplified.

In the durability test process, the first output half shaft and the second output half shaft are generally required to be driven to rotate for 3-6 months through a motor, the time is long, if the differential 1 to be tested shakes in the process, the phenomenon of inaccurate detection effect can be caused, and based on the phenomenon, the differential 1 to be tested needs to be ensured to be stably installed during detection and has the same working condition as that during normal operation. In order to ensure accurate detection effect, the mounting structure of the differential 1 to be detected and the differential test fixing box 4 in this embodiment is as follows: the differential mechanism testing and fixing box body 4 mainly comprises a main box body 41 and a left cover plate 43, wherein a concave spigot 42 is arranged on the left side of the main box body 41, a spigot flange plate 5 detachably connected with the main box body 41 is embedded at the spigot 42, a plurality of threaded holes 53 for fixedly connecting with the differential mechanism 1 to be tested are arranged on the spigot flange plate 5, and fixing holes corresponding to the threaded holes 53 one by one are arranged at the spigot 42; the left cover plate 43 is arranged in the spigot 42 of the main box 41 and detachably connected with the main box 41, and the middle part of the left cover plate 43 and the middle part of the side plate on the right side of the main box 41 are respectively provided with an assembly hole matched with the differential output half shaft on the corresponding side of the differential 1 to be tested. Like this, including left apron 43 in the differential mechanism test fixed box 4, form the assembly, the support to differential mechanism through left apron 43 to carry out preliminary location to the differential mechanism 1 that awaits measuring through tang ring flange 5, make the differential mechanism 1 that awaits measuring fixed assembly in differential mechanism test fixed box 4, this kind of box setting structure can be convenient for the installation and the dismantlement of differential mechanism 1 that awaits measuring. Specifically, when the differential mechanism is fixed, the spigot flange 5 and the differential mechanism 1 to be measured are fixed together, then the differential mechanism 1 to be measured and the spigot flange 5 are placed in the main box 41 together, after bolts pass through threaded holes, the differential mechanism 1 to be measured is fixed with the main box 41 through the spigot flange 5, so that the differential mechanism 1 to be measured is fixed, and finally, the left cover plate 43 is fixed on the left side of the main box 41. When the differential 1 to be tested is disassembled and replaced, the left cover plate 43 on the left side can be disassembled first, then the bolts of the flange plate after the disassembly and fixation are disassembled, and the communicating spigot flange plate 5 is used for taking out the differential in the main box body 41 together. The middle part of the spigot flange plate 5 is matched with the differential mechanism 1 to be tested, and can form support and positioning for the differential mechanism 1 to be tested. According to the difference of differential mechanism model, can correspond to change different tang ring flange 5 adaptations to reach the effect that can adapt to different model differentials and test.

As shown in fig. 3, the spigot flange 5 in this embodiment is rectangular, and the spigot is also rectangular. The spigot flange plate 5 is also provided with a circle of flange positioning holes 51 which are distributed in a rectangular shape, and the left side surface of the main box body 41 is also provided with connecting holes which are in one-to-one correspondence with the flange positioning holes 51. The high-level oil injection assembly 7 and the low-level oil injection assembly 8 comprise a mounting plate and two oil injection nozzles assembled on the mounting plate, rectangular holes smaller than the mounting plate in size are formed in the main box 41, and the high-level oil injection assembly 7 and the low-level oil injection assembly 8 are fixed to the main box 41 after the mounting plate corresponds to the rectangular holes through a plurality of fasteners.

As shown in fig. 1, the main case 41 in this embodiment is fixed to a supporting platform in use, and a plurality of fastening holes for fixing the main case 41 to the supporting platform are provided at the lower end of the main case 41.

Further, two pin holes 52 are further formed in the spigot flange 5, positioning holes corresponding to the pin holes 52 one by one are formed in the main box 41, and the spigot flange 5 and the differential 1 to be tested are initially fixed in the main box 41 after being inserted into the pin holes 52 and the positioning holes through pin shafts. Thus, before the differential mechanism is placed in the main box 41 and the spigot flange 5 is fixed, the spigot flange 5 can be initially positioned by the cooperation of the pin shaft and the pin hole 52, namely the positioning hole, and meanwhile, the accurate position of the spigot flange 5 after the differential mechanism 1 to be tested is assembled is ensured to be concentric with the differential mechanism output half shaft 11 after the preliminary positioning of the spigot flange 5.

Further, a sealing flange 6 is respectively installed on the right side of the main box 41 and the outer side of the left cover plate 43, and the middle part of the sealing flange 6 is matched with oil seal shafts on the left side and the right side of the differential 1 to be tested. In this way, the sealing flange 6 can seal the oil seal shaft of the output half shaft of the differential mechanism, so that the lubricating oil can be sealed through the oil seal mechanism, and the lubricating oil is prevented from being exposed. Meanwhile, after the sealing flange plate is matched with the oil seal, the differential mechanism output shaft can be limited, and larger shaking in the testing process is avoided.

Further, an outwardly protruding connection protrusion is provided at the middle part of the left cover plate 43, the middle part of the side plate on the right side of the main box 41 is outwardly protruding to form a connection ring, the connection ring and the connection protrusion are respectively correspondingly connected with the sealing flange 6 on the corresponding side, and a circle of sealant is provided between the sealing flange 6 and the connection ring and between the sealing flange 6 and the connection protrusion. Specifically, all be equipped with a plurality of fastening screw holes that are circular distribution on go-between and connecting the arch, fastening screw hole and the through-hole one-to-one on the sealing flange 6, after all running through the through-hole through fastening bolt between sealing flange 6 and left apron 43 and the main tank body 41, it is fixed after screw-fit with fastening screw hole. Like this, after the left apron 43 and the outside arch in main box 41 right side all, can be with the fine laminating of the sealed ring flange 6 of corresponding side and be connected, and the sealing gum that sets up can seal the junction of sealed ring flange 6 main box 41 and left apron 43, avoids lubricating oil excessive.

Further, the differential testing and fixing box 4 is a rectangular box, an observation window 45 is formed in the upper end face of the differential testing and fixing box 4, and a transparent sealing cover 46 is detachably mounted at the observation window 45. Thus, after the observation window 45 and the transparent sealing cover 46 are arranged, a worker can observe the oil injection condition of the internal oil injection assembly conveniently through the observation window 45 at the top.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the technical solution, and those skilled in the art should understand that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the present utility model, and all such modifications and equivalents are included in the scope of the claims.

Claims (6)

1. The utility model provides a differential mechanism gear durability testing arrangement, includes differential mechanism test fixed box, is equipped with the differential mechanism that awaits measuring rather than detachable connection in differential mechanism test fixed box, is equipped with left drive test mechanism and right drive test mechanism that meets with differential mechanism that awaits measuring respectively in differential mechanism test fixed box's left and right ends, left drive test mechanism has first output semi-axis, right drive test mechanism has the second output semi-axis, first output semi-axis and second output semi-axis meet with differential mechanism output semi-axis of awaiting measuring differential mechanism left and right sides respectively; the device is characterized in that driving motors in the left driving testing mechanism and the right driving testing mechanism are high-torque motors, a high-position oil injection assembly and a low-position oil injection assembly are respectively arranged on the front side and the rear side of a differential mechanism testing fixed box body and in the differential mechanism testing fixed box body, the high-position oil injection assembly and the low-position oil injection assembly respectively correspond to high-position and low-position meshed with an internal gear of a differential mechanism to be tested, each high-position oil injection assembly and each low-position oil injection assembly comprises a plurality of oil injection nozzles, and each oil injection nozzle is connected with a lubricating oil pumping and filtering mechanism outside the differential mechanism testing fixed box body through a lubricating oil pipe; an oil return hole is arranged at the bottom of the differential mechanism test fixed box body, an oil return pipe is connected at the oil return hole in a sealing mode, and the oil return pipe is connected with the lubricating oil pumping and filtering mechanism.

2. The differential gear durability test device according to claim 1, wherein the differential gear test fixing box body mainly comprises a main box body and a left cover plate, wherein a concave spigot is arranged on the left side of the main box body, a spigot flange plate detachably connected with the main box body is embedded at the spigot, and a plurality of threaded holes for fixedly connecting with a differential gear to be tested are formed in the spigot flange plate; the left cover plate is arranged in a spigot of the main box body and is detachably connected with the main box body, and the middle part of the left cover plate and the middle part of a side plate on the right side of the main box body are respectively provided with an assembly hole matched with an output half shaft on the corresponding side of the differential to be tested.

3. The differential gear durability test device according to claim 2, wherein two pin holes are further formed in the spigot flange, positioning holes corresponding to the pin holes one by one are formed in the main box body, and the spigot flange and the differential to be tested are preliminarily fixed in the main box body after being inserted into the pin holes and the positioning holes through the pin shafts.

4. The device for testing the durability of the differential gear according to claim 2, wherein a sealing flange is respectively installed on the right side of the main box body and the outer side of the left cover plate, and the middle part of the sealing flange is matched with oil seal shafts on the left side and the right side of the differential gear to be tested.

5. The durability testing device for differential gears according to claim 4, wherein an outwardly protruding connecting protrusion is provided at the middle part of the left cover plate, the middle part of the side plate at the right side of the main case is outwardly protruding to form a connecting ring, the connecting ring and the connecting protrusion are respectively and correspondingly connected with the sealing flange at the corresponding side, and a ring of sealing glue is provided between the sealing flange and the connecting ring and between the sealing flange and the connecting protrusion.

6. The durability testing apparatus for differential gears according to claim 1 or 2 or 3 or 4 or 5, wherein the differential testing fixture housing is a rectangular housing, an observation window is opened at an upper end surface of the differential testing fixture housing, and a transparent sealing cover is detachably installed at the observation window.