Differential oil seal multifunctional test device

Abstract

The present invention discloses a multifunctional test device for differential oil seal, comprising: a lubricating oil supply tank, a motor assembly and a test device, wherein the motor assembly comprises a motor shaft, and the test device comprises a tooling frame, wherein a cavity is formed inside the tooling frame, an oil seal drive shaft is arranged in the cavity, the oil seal drive shaft is connected to the motor shaft, an oil seal shaft is sleeved on the oil seal drive shaft, and cavity sliders are arranged on the upper and lower sides of the oil seal shaft, a rear-end air side air inlet adapter, an oil inlet adapter and a front-end air side air inlet adapter are arranged above the tooling frame, and a rear-end air side air outlet pressure sensor, an oil outlet pressure sensor and a front-end air side air outlet adapter are arranged below the tooling frame. The multifunctional test device for differential oil seal provided by the present invention has good scalability; it can implement different oil seal performance tests, and after minimum optimization, it can implement oil seal performance tests of different sizes; it can be applied to bidirectional rotating oil seals to verify performance at the same time, thereby improving verification efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of differentials, and in particular to a multifunctional testing device for differential oil seals. Background Art

[0002] The differential oil seal is a typical rotating shaft lip seal, which is mainly used to seal the differential lubricating oil to prevent the lubricating oil from leaking to the air side, and also to prevent dust and moisture on the air side from entering the lubricating oil cavity. In order to avoid the impact of oil seal failure on the system, it is necessary to carry out sealing performance tests of oil seals in various application environments. The application environment of oil seals is harsh, with many verification test items and different test conditions.

[0003] The current oil seal tester adopts a dynamic outer profile bracket structure. During the rotation of the motor main shaft, the motor main shaft drives the outer profile bracket to move up and down, left and right, or to perform centrifugal rotation, so that the installation hole of the oil seal is always coaxial with the motor main shaft during the test, thereby ensuring that the tested oil seal and the motor main shaft are always coaxial during the test. This scheme has the following disadvantages: 1) Differential oil seals and similar products cannot be directly sleeved on the shaft. Secondly, the eccentricity of the motor shaft and oil seal installation is one of the verification tests of the oil seal, so the differential oil seal product cannot be tested; 2) Only one seal can be verified at a time, and the verification efficiency is low for bidirectional rotating seals; 3) It is designed for the sealing performance test of the oil seal, and does not have the ability to carry out other performance tests of the oil seal (such as eccentricity limit test); 4) Directly using the motor shaft and oil seal for testing has poor scalability and can only be used for a specific oil seal test.

[0004] Therefore, a multifunctional testing device for differential oil seal is urgently needed. Summary of the invention

[0005] The purpose of the present invention is to provide a multifunctional testing device for differential oil seals to solve the problems in the above-mentioned prior art. The device has good scalability, can implement different oil seal performance tests, and after minimum optimization, can implement oil seal performance tests of different sizes. It can be applied to bidirectional rotating oil seals to simultaneously verify performance and improve verification efficiency.

[0006] The present invention provides a multifunctional testing device for differential oil seal, which comprises:

[0007] A lubricating oil supply tank, a motor assembly and a testing device, wherein one end of the testing device is connected to the lubricating oil supply tank, and the other end is connected to the motor assembly, the motor assembly includes a motor shaft, and the testing device includes a tooling frame, a cavity is formed inside the tooling frame, an oil seal drive shaft extending to the outside of the tooling frame is arranged in the cavity, the oil seal drive shaft is connected to the motor shaft, an oil seal shaft is sleeved on the oil seal drive shaft, cavity sliders are respectively arranged on the upper and lower sides of the oil seal shaft, a small gap is fitted between the cavity slider and the cavity, a lubricating oil cavity is formed in the cavity slider, air cavities are respectively formed on the left and right sides of the cavity slider, and a front cover plate is arranged at one end of the tooling frame close to the motor shaft, The tooling skeleton is provided with a rear cover plate at one end away from the motor shaft, and a rear-end air side air inlet adapter, an oil inlet adapter and a front-end air side air inlet adapter are sequentially arranged above the tooling skeleton, the oil inlet adapter corresponds to the position of the cavity slider and is used for the inlet of lubricating oil, and the rear-end air side air inlet adapter and the front-end air side air inlet adapter are used for the connection of pressurized gas; a rear-end air side air outlet pressure sensor, an oil outlet pressure sensor and a front-end air side air outlet adapter are sequentially arranged below the tooling skeleton, the oil outlet pressure sensor corresponds to the position of the cavity slider and is used for detecting the pressure of the lubricating oil cavity, and the rear-end air side air outlet pressure sensor is used for detecting the pressure on the air side.

[0008] The multifunctional testing device for differential oil seal as described above, wherein preferably, the lubricating oil supply tank comprises a lubricating oil supply tank body, the top of the lubricating oil supply tank body is provided with an oil outlet, the lower end of the side wall of the lubricating oil supply tank is provided with an oil return port, the oil outlet of the lubricating oil supply tank is connected to the oil inlet of the testing device through an oil outlet pipe, and the oil return port of the lubricating oil supply tank is connected to the oil return port of the testing device through an oil return pipe.

[0009] In the multifunctional testing device for differential oil seal as described above, preferably, the oil inlet adapter is connected to the oil outlet of the lubricating oil supply tank through the oil outlet pipe.

[0010] As described above, in the multifunctional testing device for differential oil seal, preferably, the motor shaft and the oil seal drive shaft are connected by bolts, and the clearance between the bolts and the corresponding bolt holes is adjustable to adjust the eccentricity between the oil seal drive shaft and the motor shaft.

[0011] The multifunctional testing device for differential oil seal as described above, wherein preferably, the rear end air side air inlet adapter, the oil inlet adapter, the front end air side air inlet adapter, the rear end air side air outlet pressure sensor, the oil outlet pressure sensor, and the front end air side air outlet adapter are connected to the tooling skeleton via threads with the same interface size, and O-rings are respectively provided at corresponding threads to ensure the sealing of the interface with the tooling skeleton.

[0012] As described above, in the multifunctional testing device for differential oil seal, preferably, a first sealing gasket is provided on the cavity mating surface between the cavity slider and the tooling frame, for sealing the lubricating oil cavity and preventing the lubricating oil from leaking to the air side along the radial gap through the cavity between the cavity slider and the tooling frame.

[0013] As described above, in the multifunctional testing device for differential oil seal, preferably, the front cover plate is fixed to the tooling frame by front cover plate fixing bolts, the front cover plate fixing bolts are clearance-matched with the oil seal drive shaft, and the mating surfaces between the front cover plate and the tooling frame are sealed by a second sealing gasket.

[0014] In the differential oil seal multifunctional testing device as described above, preferably, the rear cover plate is fixed to the tooling frame by rear cover plate fixing bolts, and the mating surfaces of the rear cover plate and the tooling frame are sealed by a third sealing gasket.

[0015] The differential oil seal multifunctional testing device as described above, wherein, preferably, the end of the oil seal drive shaft is provided with an external thread of a preset length, the inner hole of the oil seal shaft is provided with an internal thread matching the external thread, the oil seal drive shaft and the oil seal shaft are connected by an oil seal shaft limiting bolt, and the oil seal shaft limiting bolt includes an internal thread fixed at the end of the oil seal drive shaft, for preventing the oil seal shaft from axial movement and relative rotation relative to the oil seal drive shaft.

[0016] As described above, in the multifunctional testing device for differential oil seals, preferably, oil seals are installed in the inner rings on both sides of the cavity slider, the outer ring of the oil seal is interference fit with the inner ring of the cavity slider, and the two oil seals on both sides of the same cavity slider are installed in a back-to-back manner.

[0017] The present invention provides a multifunctional testing device for differential oil seals, which is simple in device, convenient in installation and has good scalability; it can implement different oil seal performance tests, and after minimum optimization, it can implement oil seal performance tests of different sizes; it can be used for testing high-speed oil seals as well as low-speed oil seals; it can test a single oil seal or two oil seals at the same time, which is more efficient; it can verify the performance of bidirectional rotating oil seals at the same time, which improves the verification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0019] Figure 1 The overall structural diagram of an embodiment of the multifunctional testing device for differential oil seal provided by the present invention;

[0020] Figure 2 A schematic structural diagram of a lubricating oil supply tank of an embodiment of a multifunctional testing device for differential oil seal provided by the present invention;

[0021] Figure 3 A schematic diagram of the connection between the motor assembly and the test device of an embodiment of the multifunctional test device for differential oil seal provided by the present invention;

[0022] Figure 4 and Figure 5 A cross-sectional view of a test device of an embodiment of a multifunctional test device for differential oil seal provided by the present invention;

[0023] Figure 6 A schematic structural diagram of a lubricating oil chamber of an embodiment of a multifunctional testing device for differential oil seal provided by the present invention;

[0024] Figure 7 A schematic structural diagram of a sealing gasket in an embodiment of the multifunctional testing device for differential oil seal provided by the present invention.

[0025] Explanation of the reference numerals: 1-lubricating oil supply tank, 2-motor assembly, 3-test device, 4-oil return pipe, 5-oil outlet pipe, 6-oil outlet, 7-oil return port, 8-lubricating oil supply tank body, 9-motor shaft, 10-oil seal drive shaft, 11-oil seal shaft, 12-oil seal shaft limit bolt, 13-cavity slider, 14-oil seal, 15-tooling frame, 16-front cover plate, 17-front cover plate fixing bolt, 18-rear cover plate, 19-rear cover plate fixing bolt, 20-rear end air side air inlet adapter, 21-oil inlet adapter, 22-front end air side air inlet adapter, 23-rear end air side outlet pressure sensor, 24-oil outlet pressure sensor, 25-front end air side outlet adapter, 26-first sealing gasket, 27-lubricating oil chamber, 28-second sealing gasket, 29-third sealing gasket. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0027] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprises" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intermediate component between the specific component and the first component or the second component. When a specific component is described as being connected to other components, the specific component may be directly connected to the other components without an intermediate component, or may not be directly connected to the other components but have an intermediate component.

[0029] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0031] like Figure 1-Figure 7 As shown, the embodiment of the present invention provides a multifunctional test device for differential oil seal, which includes: a lubricating oil supply tank 1, a motor assembly 2 and a test device 3, as shown in FIG. Figure 1 As shown, one end of the test device 3 is connected to the lubricating oil supply tank 1, and the other end is connected to the motor assembly 2. Figure 3 As shown, the motor assembly 2 includes a motor shaft 9. Figure 4 and Figure 5As shown, the test device 3 includes a tooling skeleton 15, a cavity is formed inside the tooling skeleton 15, an oil seal drive shaft 10 extending to the outside of the tooling skeleton 15 is arranged in the cavity, the oil seal drive shaft 10 is connected to the motor shaft 9, an oil seal shaft 11 is sleeved on the oil seal drive shaft 10, and cavity sliders 13 are respectively arranged on the upper and lower sides of the oil seal shaft 11, and a small gap is matched between the cavity slider 13 and the cavity, as shown in FIG. Figure 6 As shown, a lubricating oil cavity 27 is formed in the cavity slider 13, and air cavities are formed on the left and right sides of the cavity slider 13, respectively. Figure 5 As shown, the tooling skeleton 15 is provided with a front cover plate 16 at one end close to the motor shaft 9, and the tooling skeleton 15 is provided with a rear cover plate 18 at one end away from the motor shaft 9. The tooling skeleton 15 is provided with a rear end air side air inlet adapter 20, an oil inlet adapter 21 and a front end air side air inlet adapter 22 in sequence above the tooling skeleton 15, the oil inlet adapter 21 corresponds to the position of the cavity slider 13 and is used for the oil inlet of the lubricating oil, the rear end air side air inlet adapter 20 and the front end air side air inlet adapter 22 are used for the communication of the pressurized gas; the tooling skeleton 15 is provided with a rear end air side air outlet pressure sensor 23, an oil outlet pressure sensor 24 and a front end air side air outlet adapter 25 in sequence below, the oil outlet pressure sensor 24 corresponds to the position of the cavity slider 13 and is used for detecting the pressure of the lubricating oil cavity 27, and the rear end air side air outlet pressure sensor 23 is used for detecting the pressure on the air side.

[0032] Among them, Figure 2 As shown, the lubricating oil supply tank 1 includes a lubricating oil supply tank body 8, the top of the lubricating oil supply tank body 8 is provided with an oil outlet 6, the lower end of the side wall of the lubricating oil supply tank 1 is provided with an oil return port 7, the oil outlet 6 of the lubricating oil supply tank 1 is connected to the oil inlet of the test device 3 through an oil outlet pipe 5, and the oil return port 7 of the lubricating oil supply tank 1 is connected to the oil return port of the test device 3 through an oil return pipe 4, that is, the lubricating oil supply tank 1 is connected to the oil inlet and oil return port of the test device 3 through the oil outlet pipe 5 and the oil return pipe 4, respectively, and the lubricating oil supply tank body 8 is provided with an oil pump, a heater, and a pressure regulating device to regulate the volume, temperature, pressure, etc. of the output lubricating oil. The oil inlet adapter 21 is connected to the oil outlet 6 of the lubricating oil supply tank 1 through the oil outlet pipe 5.

[0033] Furthermore, if Figure 3 As shown, the motor shaft 9 is connected to the oil seal drive shaft 10 by bolts, and the clearance between the bolts and the corresponding bolt holes is adjustable to adjust the eccentricity between the oil seal drive shaft 10 and the motor shaft 9 .

[0034] Furthermore, the rear air side air inlet adapter 20, the oil inlet adapter 21, the front air side air inlet adapter 22, the rear air side air outlet pressure sensor 23, the oil outlet pressure sensor 24, and the front air side air outlet adapter 25 are connected to the tooling skeleton 15 through threads with the same interface size (i.e., the same thread specifications), and O-rings are respectively sleeved at the corresponding threads to ensure the interface sealing with the tooling skeleton 15. In some embodiments of the present invention, the rear air side air outlet pressure sensor 23 can be replaced with the rear air side air inlet adapter 20 or replaced with a switch valve with the same interface as needed to discharge the medium in the air cavity; the oil outlet pressure sensor 24 can be replaced with the rear air side air inlet adapter 20 or replaced with a switch valve with the same interface as needed to discharge the medium in the lubricating oil cavity 27; the front air side air outlet adapter 25 can be replaced with a switch valve with the same interface as the rear air side air inlet adapter 20 as needed to discharge the medium in the air cavity. In some embodiments of the present invention, the installation positions of the rear-end air side air inlet adapter 20, the oil inlet adapter 21, the front-end air side air inlet adapter 22, the rear-end air side air outlet pressure sensor 23, the oil outlet pressure sensor 24, and the front-end air side air outlet adapter 25 can be interchanged or cancelled as needed.

[0035] Furthermore, if Figure 6 As shown, the cavity mating surface of the cavity slider 13 and the tooling skeleton 15 is provided with a first sealing gasket 26 for sealing the lubricating oil cavity 27 to prevent the lubricating oil from leaking to the air side along the radial gap of the cavity between the cavity slider 13 and the tooling skeleton 15.

[0036] Furthermore, if Figure 5 As shown, the front cover plate 16 is fixed to the tooling frame 15 by the front cover plate fixing bolts 17, and the front cover plate fixing bolts 17 and the oil seal drive shaft 10 are clearance-matched. Figure 7 As shown, the mating surfaces of the front cover plate 16 and the tooling frame 15 are sealed by a second sealing gasket 28; a front air cavity is formed between the front cover plate fixing bolt 17 and the tooling frame 15, which can be used for tests of partially filling the front air cavity with other liquids (such as water, etc.) to expand the function of the test device; after the front cover plate 16 is fixed, a clamping force is applied to the cavity slider 13 to prevent the cavity slider 13 from axial movement.

[0037] Furthermore, if Figure 5 As shown, the rear cover plate 18 is fixed to the tooling frame 15 by rear cover plate fixing bolts 19. Figure 7As shown, the mating surface of the rear cover plate 18 and the tooling frame 15 is sealed by a third sealing gasket 29. The rear cover plate fixing bolts 19 and the tooling frame 15 form a closed rear air cavity, which can be used for pressurization test of the rear air cavity, and can also be used for tests in which the rear air cavity is partially or completely filled with other liquids (such as water, etc.), thereby expanding the function of the test device. After the rear cover plate 18 is fixed, a pressing force is applied to the cavity slider 13 to prevent the cavity slider 13 from axial movement.

[0038] Furthermore, if Figure 4 As shown, the end of the oil seal drive shaft 10 is provided with an external thread of a preset length, and the inner hole of the oil seal shaft 11 is provided with an internal thread matching the external thread. The oil seal drive shaft 10 and the oil seal shaft 11 are connected by an oil seal shaft limiting bolt 12. The oil seal shaft limiting bolt 12 includes an internal thread fixed at the end of the oil seal drive shaft 10, and is used to prevent the oil seal shaft 11 from axial movement and relative rotation relative to the oil seal drive shaft 10.

[0039] Furthermore, if Figure 4 As shown, oil seals 14 are installed in the inner rings on both sides of the cavity slider 13. In a specific implementation, the oil seal 14 can be installed in the inner ring of the cavity slider 13 by means of a special tool. The outer ring of the oil seal 14 is interference fit with the inner ring of the cavity slider 13. The two oil seals 14 on both sides of the same cavity slider 13 are installed back to back, so that the forward and reverse characteristics can be verified at the same time.

[0040] During operation, the oil inlet adapter 21 is installed on the tooling frame 15, and connected to the oil outlet of the lubricating oil supply tank 1 through the oil outlet pipe 5, and a certain amount of lubricating oil of temperature and pressure is added to the lubricating oil chamber 27. For example, the lubricating oil supply tank 1 provides 0.5 bar and 90°C oil pressure to fill the lubricating oil chamber, and the actual pressure of the lubricating oil chamber 27 is detected by the oil outlet pressure sensor 24. The motor assembly 2 is started to make the oil seal shaft 11 obtain a certain rotation speed, and the front end air side outlet adapter 25 is used to replace the rear end air side outlet pressure sensor 23, and a measuring cup is placed under the front end air side outlet adapter 25 to measure the amount of oil collected on the two air sides after a certain period of time.

[0041] Three cavities are formed in the test device 3, which are a lubricating oil cavity and air cavities on the front and rear sides. Different media can be filled into different cavities as needed; the pressure and temperature of the medium are controlled, and the pressure is monitored by using the oil outlet pressure sensor 24 and the rear air side outlet pressure sensor 23; the test device 3 can complete the sealing performance, durability test, shaft eccentricity resistance test, back leakage test, friction torque, air tightness test, dustproof test and other tests of the differential oil seal by controlling the temperature, flow rate and pressure of the medium; the test device 3 can redesign the size of the oil seal shaft 11 and the cavity slider 13 according to different oil seals to meet the testing requirements of oil seals of different sizes.

[0042] The multifunctional testing device for differential oil seals provided in the embodiment of the present invention is simple in device, easy to install, and has good scalability; it can implement different oil seal performance tests, and after minimum optimization, it can implement oil seal performance tests of different sizes; it can be used for testing high-speed oil seals as well as low-speed oil seals; it can test a single oil seal as well as two oil seals at the same time, which is more efficient; it can verify the performance of bidirectional rotating oil seals at the same time, thereby improving verification efficiency.

[0043] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0044] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A multifunctional testing device for differential oil seal, characterized in that: include: A lubricating oil supply tank, a motor assembly and a testing device, wherein one end of the testing device is connected to the lubricating oil supply tank, and the other end is connected to the motor assembly, the motor assembly includes a motor shaft, and the testing device includes a tooling frame, a cavity is formed inside the tooling frame, an oil seal drive shaft extending to the outside of the tooling frame is arranged in the cavity, the oil seal drive shaft is connected to the motor shaft, an oil seal shaft is sleeved on the oil seal drive shaft, cavity sliders are respectively arranged on the upper and lower sides of the oil seal shaft, a small gap is fitted between the cavity slider and the cavity, a lubricating oil cavity is formed in the cavity slider, air cavities are respectively formed on the left and right sides of the cavity slider, and a front cover plate is arranged at one end of the tooling frame close to the motor shaft, The tooling skeleton is provided with a rear cover plate at one end away from the motor shaft, and a rear-end air side air inlet adapter, an oil inlet adapter and a front-end air side air inlet adapter are sequentially arranged above the tooling skeleton, the oil inlet adapter corresponds to the position of the cavity slider and is used for the inlet of lubricating oil, and the rear-end air side air inlet adapter and the front-end air side air inlet adapter are used for the connection of pressurized gas; a rear-end air side air outlet pressure sensor, an oil outlet pressure sensor and a front-end air side air outlet adapter are sequentially arranged below the tooling skeleton, the oil outlet pressure sensor corresponds to the position of the cavity slider and is used for detecting the pressure of the lubricating oil cavity, and the rear-end air side air outlet pressure sensor is used for detecting the pressure on the air side.

2. The multifunctional testing device for differential oil seal according to claim 1, characterized in that: The lubricating oil supply tank comprises a lubricating oil supply tank body, the top of the lubricating oil supply tank body is provided with an oil outlet, the lower end of the side wall of the lubricating oil supply tank is provided with an oil return port, the oil outlet of the lubricating oil supply tank is connected to the oil inlet of the testing device through an oil outlet pipe, and the oil return port of the lubricating oil supply tank is connected to the oil return port of the testing device through an oil return pipe.

3. The multifunctional testing device for differential oil seal according to claim 2, characterized in that: The oil inlet adapter is connected to the oil outlet of the lubricating oil supply tank through the oil outlet pipe.

4. The multifunctional testing device for differential oil seal according to claim 1, characterized in that: The motor shaft is connected to the oil seal drive shaft via bolts, and the clearance between the bolts and the corresponding bolt holes is adjustable to adjust the eccentricity between the oil seal drive shaft and the motor shaft.

5. The multifunctional testing device for differential oil seal according to claim 1, characterized in that: The rear-end air side air inlet adapter, the oil inlet adapter, the front-end air side air inlet adapter, the rear-end air side air outlet pressure sensor, the oil outlet pressure sensor, and the front-end air side air outlet adapter are connected to the tooling skeleton via threads with the same interface size, and O-rings are respectively provided on the corresponding threads to ensure the sealing of the interface with the tooling skeleton.

6. The multifunctional testing device for differential oil seal according to claim 1, characterized in that: The cavity mating surface between the cavity slider and the tooling frame is provided with a first sealing gasket for sealing the lubricating oil cavity to prevent the lubricating oil from leaking to the air side along the radial gap of the cavity between the cavity slider and the tooling frame.

7. The multifunctional testing device for differential oil seal according to claim 1, characterized in that: The front cover plate is fixed to the tooling frame by front cover plate fixing bolts, the front cover plate fixing bolts are clearance-matched with the oil seal drive shaft, and the matching surfaces of the front cover plate and the tooling frame are sealed by a second sealing gasket.

8. The multifunctional testing device for differential oil seal according to claim 1, characterized in that: The rear cover plate is fixed to the tooling frame by rear cover plate fixing bolts, and the matching surfaces of the rear cover plate and the tooling frame are sealed by a third sealing gasket.

9. The multifunctional testing device for differential oil seal according to claim 1, characterized in that: The end of the oil seal drive shaft is provided with an external thread of a preset length, and the inner hole of the oil seal shaft is provided with an internal thread matching the external thread. The oil seal drive shaft and the oil seal shaft are connected by an oil seal shaft limiting bolt, and the oil seal shaft limiting bolt includes an internal thread fixed at the end of the oil seal drive shaft, which is used to prevent the oil seal shaft from axial movement and relative rotation relative to the oil seal drive shaft.

10. The multifunctional testing device for differential oil seal according to claim 1, characterized in that: Oil seals are installed in the inner rings on both sides of the cavity slider, and the outer ring of the oil seal is interference fit with the inner ring of the cavity slider. The two oil seals on both sides of the same cavity slider are installed in a back-to-back manner.

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