CN115235747A - Differential oil seal multifunctional test device - Google Patents

Abstract

The invention discloses a multifunctional testing device for differential gear oil seal, comprising: a lubricating oil supply tank, a motor assembly and a testing device, the motor assembly includes a motor shaft, the testing device includes a tool frame, and a cavity is formed inside the tool frame. There is an oil seal drive shaft in the cavity, the oil seal drive shaft is connected with the motor shaft, the oil seal drive shaft is sleeved with an oil seal shaft, the upper and lower sides of the oil seal shaft are provided with cavity sliders, and the rear air side air inlet is arranged above the tooling frame The adapter, the oil inlet adapter and the front air side air inlet adapter are provided with the rear air side outlet pressure sensor, the oil outlet pressure sensor and the front air side outlet adapter under the tooling frame. The differential oil seal multifunctional test device provided by the invention has good expansibility; 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 The performance of the oil seal is verified at the same time, which improves the verification efficiency.

Description

Differential oil seal multifunctional test device

technical field

The invention relates to the technical field of differential gears, in particular to a multifunctional testing device for differential gear oil seals.

Background technique

The differential oil seal is a typical rotary shaft lip seal. Its main function is to seal the differential oil, prevent the oil from leaking to the air side, and also prevent the dust and water on the air side from entering the lubricating oil cavity. In order to avoid the influence 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, there are many verification test items, and the test conditions are not the same.

The current oil seal testing machine adopts a dynamic outer contour support structure. During the rotation of the motor spindle, the motor spindle drives the outer contour support to move up and down, left and right, or perform centrifugal rotation, so that the installation hole of the oil seal is connected to the motor spindle. It is always coaxial during the test, thus ensuring that the tested oil seal and the motor shaft are always coaxial during the test. This scheme has the following disadvantages: 1) Differential oil seal and other similar products cannot be directly sleeved on the shaft, and 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) Once Only one seal can be verified, and the verification efficiency is low for two-way rotating seals; 3) It is designed for the sealing performance test of oil seals, and does not have the ability to carry out other performance tests of oil seals (such as eccentric limit tests); 4) The direct use of the motor shaft and the oil seal for the test has poor scalability and can only be used for a certain oil seal test.

Therefore, there is an urgent need for a multifunctional testing device for differential oil seals.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a differential oil seal multifunctional testing device to solve the above-mentioned problems in the prior art, has good scalability, can implement different oil seal performance tests, and can be Carry out performance test of oil seals of different sizes; it can be applied to bidirectionally rotating oil seals to verify performance at the same time to improve verification efficiency.

The present invention provides a differential oil seal multifunctional testing device, which includes:

A lubricating oil supply tank, a motor assembly and a testing device, 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 It includes a tooling frame, a cavity is formed inside the tooling frame, an oil seal drive shaft extending to the outside of the tool frame is arranged in the cavity, the oil seal drive shaft is connected with the motor shaft, and the oil seal drive shaft is on the An oil seal shaft is sleeved, the upper and lower sides of the oil seal shaft are respectively provided with cavity sliders, the cavity sliders fit with the cavity with a small gap, and lubricating oil is formed in the cavity sliders The left and right sides of the cavity slider are respectively formed with air cavities, the tooling frame is provided with a front cover at the end close to the motor shaft, and the tooling frame is provided with a front cover at the end away from the motor shaft The rear cover plate, the upper part of the tooling frame is sequentially provided with a rear air side air inlet adapter, an oil inlet adapter and a front air side air inlet adapter, and the oil inlet adapter is connected to the cavity. The position of the slider corresponds to the oil inlet of the lubricating oil, and the rear air side air inlet adapter and the front air side inlet adapter are used for the communication of pressurized gas; the lower part of the tooling skeleton The rear air side air outlet pressure sensor, the oil outlet pressure sensor and the front air side air outlet adapter are arranged in sequence. The oil outlet pressure sensor corresponds to the position of the cavity slider and is used to detect the lubricating oil cavity. pressure, the rear air side outlet pressure sensor is used to detect the air side pressure.

In the above multifunctional testing device for differential oil seal, preferably, the lubricating oil supply tank includes a lubricating oil supply tank body, and the top of the lubricating oil supply tank is provided with an oil outlet, so 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 with the oil inlet of the test device through an oil outlet pipe, and the oil return port of the lubricating oil supply tank passes through The oil return pipe is connected with the oil return port of the test device.

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

In the above multifunctional testing device for differential oil seal, preferably, the motor shaft and the oil seal drive shaft are connected by bolts, and the gap between the bolt and the corresponding bolt hole can be adjusted to adjust the The eccentricity between the oil seal drive shaft and the motor shaft.

The differential oil seal multifunctional test device as described above, wherein, preferably, the rear air side air inlet adapter, the oil inlet adapter, the front air side air inlet adapter, The rear air side air outlet pressure sensor, the oil outlet pressure sensor, and the front air side air outlet adapter are connected to the tooling frame through threads with the same interface size, and are respectively sleeved at the corresponding threads There are O-rings to ensure that the interface with the tooling skeleton is sealed.

In the above-mentioned multi-function test device for differential oil seal, preferably, a first gasket is provided on the cavity mating surface of the cavity slider and the tooling frame for sealing the lubricating oil cavity , to prevent the lubricating oil from leaking to the air side along the radial gap through the cavity between the cavity slider and the tool frame.

In the above multi-function test device for differential oil seal, preferably, the front cover is fixed on the tooling frame through front cover fixing bolts, and the front cover fixing bolts are driven by the oil seal. The shafts are in clearance fit, and the mating surfaces of the front cover plate and the tool frame are sealed by a second gasket.

In the above multifunctional testing device for differential oil seal, preferably, the rear cover plate is fixed on the tooling frame through the rear cover plate fixing bolts, and the rear cover plate and the tooling frame cooperate with each other The face is sealed by a third gasket.

In the above multi-function test device for differential oil seal, preferably, 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 the external thread The matching internal thread, the oil seal drive shaft and the oil seal shaft are connected by an oil seal shaft limit bolt, and the oil seal shaft limit bolt includes an internal thread fixed on the end of the oil seal drive shaft to prevent the oil seal Axial movement of the shaft and relative rotation with respect to the oil seal drive shaft.

In the above multi-function test device for differential oil seal, preferably, oil seals are installed in the inner rings on both sides of the cavity slider, and the outer ring of the oil seal is connected to the inner ring of the cavity slider. Ring interference fit, the two oil seals on both sides of the same cavity slider are installed in a back-to-back manner.

The invention provides a multifunctional testing device for the differential oil seal, which is simple in device, convenient in installation, and has good expandability; it can implement different oil seal performance tests, and after minimum optimization, it can implement oil seal performances of different sizes It can be used for high-speed oil seal and low-speed oil seal testing; it can test a single oil seal or two oil seals at the same time, which is more efficient; it can simultaneously verify the performance of oil seals with bidirectional rotation and improve the verification efficiency.

Description of drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings, wherein:

1 is a schematic diagram of the overall structure of an embodiment of a differential oil seal multifunctional testing device provided by the present invention;

2 is a schematic structural diagram of a lubricating oil supply tank of an embodiment of the differential oil seal multifunctional testing device provided by the present invention;

3 is a schematic diagram of the connection between the motor assembly and the testing device of the embodiment of the differential oil seal multifunctional testing device provided by the present invention;

4 and 5 are cross-sectional views of the testing device of the embodiment of the differential oil seal multifunctional testing device provided by the present invention;

6 is a schematic structural diagram of a lubricating oil cavity of an embodiment of the differential oil seal multifunctional testing device provided by the present invention;

FIG. 7 is a schematic structural diagram of a sealing gasket of an embodiment of the differential oil seal multifunctional testing device provided by the present invention.

Description of reference numerals: 1-lubricating oil supply tank, 2-motor assembly, 3-testing device, 4-oil return pipe, 5-oil outlet pipe, 6-oil outlet, 7-oil return port, 8-lubricating oil supply Oil 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, 17- Front cover fixing bolts, 18- Rear cover plate, 19- Rear cover fixing bolts, 20- Rear air side air inlet adapter, 21- Oil inlet adapter, 22- Front air side air inlet Adapter, 23-rear air side outlet pressure sensor, 24-oil outlet pressure sensor, 25-front air side outlet adapter, 26-first gasket, 27-lubricating oil chamber, 28-second seal Pad, 29 - Third gasket.

Detailed ways

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 in no way limits the disclosure, its application or uses in any way. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that unless specifically stated otherwise, the relative arrangements of parts and steps, compositions of materials, numerical expressions and numerical values set forth in these embodiments are to be interpreted as illustrative only and not as limiting.

As used in this disclosure, "first", "second": and similar terms do not denote any order, quantity, or importance, but are merely used to distinguish the different parts. "Comprising" or "comprising" and similar words mean that the element preceding the word covers the elements listed after the word, and does not exclude the possibility that other elements are also covered. "Up", "down", etc. are only used to indicate the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

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

All terms (including technical or scientific terms) used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general-purpose dictionaries should be construed to have meanings consistent with their meanings in the context of the related art, and not to be construed in an idealized or highly formalized sense, unless explicitly stated herein. Defined like this.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, techniques, methods, and apparatus should be considered part of the specification.

As shown in FIG. 1-FIG. 7, an embodiment of the present invention provides a differential oil seal multi-function testing device, which includes: a lubricating oil supply tank 1, a motor assembly 2 and a testing device 3, as shown in FIG. 1, One end of the testing device 3 is connected to the lubricating oil supply tank 1, and the other end is connected to the motor assembly 2, as shown in FIG. 3, the motor assembly 2 includes a motor shaft 9, as shown in FIG. 4 and FIG. As shown in 5, the test device 3 includes a tool frame 15, a cavity is formed inside the tool frame 15, and an oil seal drive shaft 10 extending to the outside of the tool frame 15 is arranged in the cavity, and the oil seal drive shaft 10 is connected to the motor shaft 9, the oil seal drive shaft 10 is sleeved with an oil seal shaft 11, and the upper and lower sides of the oil seal shaft 11 are respectively provided with cavity sliders 13, the cavity sliders 13 and the There is a small clearance fit between the cavities. As shown in FIG. 6 , a lubricating oil cavity 27 is formed in the cavity slider 13 , and air cavities are respectively formed on the left and right sides of the cavity slider 13 , as shown in FIG. 5 . As shown, the tooling frame 15 is provided with a front cover 16 at one end close to the motor shaft 9, and the tooling frame 15 is provided with a rear cover 18 at the end away from the motor shaft 9. The tooling frame 15 The rear end air side air inlet adapter 20, the oil inlet adapter 21 and the front air side air inlet adapter 22 are sequentially arranged above the oil inlet adapter 21 and the cavity slider 13. Corresponding positions, used for lubricating oil intake, the rear air side air inlet adapter 20 and the front air side air inlet adapter 22 are used for the communication of pressurized gas; the lower part of the tooling frame 15 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 arranged in sequence, and the oil outlet pressure sensor 24 corresponds to the position of the cavity slider 13, using In order to detect the pressure of the lubricating oil chamber 27, the rear air side outlet pressure sensor 23 is used to detect the air side pressure.

Wherein, as shown in FIG. 2 , the lubricating oil supply tank 1 includes a lubricating oil supply tank body 8 , and an oil outlet 6 is provided on the top of the lubricating oil supply tank body 8 . The lower end of the side wall is provided with an oil return port 7, the oil outlet 6 of the lubricating oil supply tank 1 is connected with the oil inlet of the testing device 3 through the oil outlet pipe 5, and the oil return port 7 of the lubricating oil supply tank 1 The oil return pipe 4 is connected to the oil return port of the test device 3, that is, the lubricating oil supply tank 1 is connected to the oil inlet and the 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 An oil pump, a heater, and a pressure adjusting device are arranged in the oil supply tank body 8 to adjust 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 .

Further, as shown in FIG. 3 , the motor shaft 9 and the oil seal drive shaft 10 are connected by bolts, and the gap between the bolts and the corresponding bolt holes can be adjusted to adjust the oil seal drive shaft 10 and the motor. Eccentricity of shaft 9.

Further, 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 outlet pressure sensor 23, The oil outlet pressure sensor 24 and the front air side air outlet adapter 25 are connected to the tooling frame 15 through threads with the same interface size (ie, the thread specifications are the same), and are respectively sleeved with O at the corresponding threads. ring to ensure the sealing of the interface with the tooling frame 15 . In some embodiments of the present invention, the rear air side air outlet pressure sensor 23 and the rear air side air inlet adapter 20 can be exchanged or replaced with an on-off valve with the same interface as required, so as to clear the medium in the air cavity ; The oil outlet pressure sensor 24 can be exchanged with the rear air side inlet port adapter 20 or replaced with an on-off valve with the same interface as required to drain the medium in the lubricating oil cavity 27; the front air side air outlet adapter 25 can be replaced with an on-off valve with the same interface as the rear air-side air inlet adapter 20 as required, which is used to drain the air chamber medium. In some embodiments of the present invention, the rear air side air inlet port adapter 20 , the oil inlet port adapter 21 , the front air side air inlet port adapter 22 and the rear air side air outlet pressure sensor 23 can also be installed as required. , The installation positions of the oil outlet pressure sensor 24 and the front air side air outlet adapter 25 are interchanged or cancelled.

Further, as shown in FIG. 6 , the cavity mating surface of the cavity slider 13 and the tooling frame 15 is provided with a first sealing gasket 26 for sealing the lubricating oil cavity 27 and preventing the lubricating oil from passing through the cavity. The cavity between the cavity slider 13 and the tool frame 15 leaks to the air side along the radial gap.

Further, as shown in FIG. 5 , the front cover 16 is fixed on the tool frame 15 by the front cover fixing bolts 17 , and the front cover fixing bolts 17 and the oil seal drive shaft 10 are in clearance fit. 7, the mating surface of the front cover 16 and the tooling frame 15 is sealed by the second gasket 28; a front air cavity is formed between the front cover fixing bolt 17 and the tooling frame 15, which can be used for front The air cavity is partially filled with other liquids (such as water, etc.) to expand the function of the test device. After the front cover 16 is fixed, a pressing force is applied to the cavity slider 13 to prevent the cavity slider 13 from moving axially.

Further, as shown in FIG. 5 , the rear cover 18 is fixed on the tooling frame 15 through the rear cover fixing bolts 19 . As shown in FIG. 7 , the rear cover 18 is connected to the tooling frame 15 . The mating surface is sealed by the third gasket 29 . The fixing bolts 19 of the rear cover plate and the tooling frame 15 form a closed rear air cavity, which can be used for the pressure test of the rear air cavity, and can also be used for the test of partially or completely filling the rear air cavity with other liquids (such as water, etc.). To test the function of the 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 moving axially.

Further, as shown in FIG. 4 , the end of the oil seal drive shaft 10 is provided with an external thread of a preset length, the inner hole of the oil seal shaft 11 is provided with an internal thread matched with the external thread, and the oil seal The drive shaft 10 and the oil seal shaft 11 are connected by an oil seal shaft limit bolt 12 , and the oil seal shaft limit bolt 12 includes an internal thread fixed on the end of the oil seal drive shaft 10 to prevent the oil seal shaft 11 from being damaged. Axial movement and relative rotation with respect to the oil seal drive shaft 10 .

Further, as shown in FIG. 4 , oil seals 14 are installed in the inner rings on both sides of the cavity slider 13 . In a specific implementation, the oil seals 14 can be installed on the inner rings of the cavity slider 13 through special tooling. , the outer ring of the oil seal 14 is in an interference fit with the inner ring of the cavity slider 13, and the two oil seals 14 on both sides of the same cavity slider 13 are installed in a back-to-back manner, so that they can be installed at the same time. Verify the forward and reverse characteristics.

During operation, the oil inlet adapter 21 is installed on the tooling frame 15, and communicated with the oil outlet of the lubricating oil supply tank 1 through the oil outlet pipe 5, and the lubricating oil cavity 27 is filled with a certain amount of lubricating oil with temperature and pressure. Oil, for example, the lubricating oil supply tank 1 provides 0.5bar, 90 ℃ oil pressure to fill the lubricating oil cavity, and the actual pressure of the lubricating oil cavity 27 is detected by the oil outlet pressure sensor 24, and the motor assembly 2 is started, so that the oil seal shaft 11 obtains At a certain speed, use the front air side outlet adapter 25 to replace the rear air side outlet pressure sensor 23, and place a measuring cup under the front air side outlet adapter 25 to measure the oil collected by the two air sides after a certain period of time quantity.

There are 3 cavities formed in the test device 3, which are a lubricating oil cavity and an air cavity on the front and rear sides. And use the oil port pressure sensor 24 and the rear air side air outlet pressure sensor 23 for pressure monitoring; the test device 3 can complete the sealing performance, durability test, and resistance to shaft eccentricity of the differential oil seal through the temperature, flow, and pressure control of the medium. Test, back leakage test, friction torque, air tightness test, dustproof test, etc.; the test device 3 can redesign the size of the oil seal shaft 11 and the cavity slider 13 according to different oil seals, so as to meet the requirements of different sizes of oil seals. test requirements.

The multi-functional testing device for differential oil seal provided by the embodiment of the present invention has the advantages of simple device, convenient installation, and good scalability; it can carry out different oil seal performance tests, and after minimum optimization, it can carry out oil seals of different sizes Performance test; it can be used for high-speed oil seal and low-speed oil seal test; 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 oil seals with bidirectional rotation at the same time to improve the verification efficiency.

So far, the various embodiments of the present disclosure have been described in detail. Some details that are well known in the art are not described in order to avoid obscuring the concept of the present disclosure. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

While some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art will appreciate that the above examples are provided for illustration only, and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that, without departing from the scope and spirit of the present disclosure, the above embodiments can be modified or some technical features can be equivalently replaced. The scope of the present disclosure is defined by the appended claims.

Claims (10)

1. a differential oil seal multifunctional test device, is characterized in that, comprises: A lubricating oil supply tank, a motor assembly and a testing device, 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 It includes a tooling frame, a cavity is formed inside the tooling frame, an oil seal drive shaft extending to the outside of the tool frame is arranged in the cavity, the oil seal drive shaft is connected with the motor shaft, and the oil seal drive shaft is on the An oil seal shaft is sleeved, the upper and lower sides of the oil seal shaft are respectively provided with cavity sliders, the cavity sliders fit with the cavity with a small gap, and lubricating oil is formed in the cavity sliders The left and right sides of the cavity slider are respectively formed with air cavities, the tooling frame is provided with a front cover at the end close to the motor shaft, and the tooling frame is provided with a front cover at the end away from the motor shaft The rear cover plate, the upper part of the tooling frame is sequentially provided with a rear air side air inlet adapter, an oil inlet adapter and a front air side air inlet adapter, and the oil inlet adapter is connected to the cavity. The position of the slider corresponds to the oil inlet of the lubricating oil, and the rear air side air inlet adapter and the front air side inlet adapter are used for the communication of pressurized gas; the lower part of the tooling skeleton The rear air side air outlet pressure sensor, the oil outlet pressure sensor and the front air side air outlet adapter are arranged in sequence. The oil outlet pressure sensor corresponds to the position of the cavity slider and is used to detect the lubricating oil cavity. pressure, the rear air side outlet pressure sensor is used to detect the air side pressure. 2 . The differential oil seal multifunctional test device according to claim 1 , wherein the lubricating oil supply tank comprises a lubricating oil supply tank body, and an oil outlet is provided on the top of the lubricating oil supply tank body. 3 . The lower end of the side wall of the lubricating oil supply tank is provided with an oil return port. The oil port is connected with the oil return port of the test device through an oil return pipe. 3 . The multifunctional testing device for differential oil seal according to claim 2 , wherein the oil inlet adapter is connected to the oil outlet of the lubricating oil supply tank through the oil outlet pipe. 4 . 4. The differential oil seal multifunctional test device according to claim 1, wherein the motor shaft and the oil seal drive shaft are connected by bolts, and the gap between the bolt and the corresponding bolt hole is adjustable to Adjust the eccentricity between the oil seal drive shaft and the motor shaft. 5 . The differential oil seal multifunctional testing device according to claim 1 , wherein the rear air side air inlet adapter, the oil inlet adapter, and the front air side inlet The adapter, the rear air side air outlet pressure sensor, the oil outlet pressure sensor, and the front air side air outlet adapter are connected to the tooling frame through threads with the same interface size, and are respectively connected to the corresponding threads. An O-ring is sleeved at the place to ensure the sealing of the interface with the tooling frame. 6 . The multi-function test device for differential oil seal according to claim 1 , wherein a first sealing gasket is provided on the cavity mating surface of the cavity slider and the tool frame to seal the cavity. 7 . The lubricating oil cavity prevents the lubricating oil from leaking to the air side along the radial gap through the cavity between the cavity slider and the tool frame. 7 . The differential oil seal multifunctional testing device according to claim 1 , wherein the front cover is fixed on the tooling frame by front cover fixing bolts, and the front cover fixing bolts are connected with the The oil seal drive shafts are in clearance fit, and the mating surfaces of the front cover plate and the tool frame are sealed by a second gasket. 8 . The multi-function test device for differential oil seal according to claim 1 , wherein the rear cover is fixed on the tooling skeleton through rear cover fixing bolts, and the rear cover is connected to the tooling 8 . The mating surface of the skeleton is sealed by a third gasket. 9 . The multi-function test device for differential oil seal according to claim 1 , wherein 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 external thread with a predetermined length. 10 . The external thread is matched with the internal thread, the oil seal drive shaft and the oil seal shaft are connected by an oil seal shaft limit bolt, and the oil seal shaft limit bolt includes an internal thread fixed on the end of the oil seal drive shaft to prevent Axial movement of the oil seal shaft and relative rotation with respect to the oil seal drive shaft. 10 . The multifunctional testing device for differential oil seals according to claim 1 , wherein oil seals are installed in the inner rings on both sides of the cavity slider, and the outer rings of the oil seals slide against the cavity. 11 . The inner ring of the block has an interference fit, and the two oil seals on both sides of the same cavity slider are installed in a back-to-back manner.

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