Transmission shaft sealing assembly, transmission shaft assembly and motor

Abstract

The invention provides a transmission shaft sealing assembly, a transmission shaft assembly and a motor, and relates to the technical field of mechanical transmission sealing. The transmission shaft sealing assembly comprises a filtering unit and a bearing isolator unit which are arranged on a bearing installation section of the transmission shaft in a sleeving mode. The bearing isolator unit is buckled to the bearing, and the filtering unit is connected to the bearing isolator unit and located on the side, opposite to the bearing, of the bearing isolator unit. According to the transmission shaft sealing assembly, multiple sealing can be achieved, the sealing effect is improved, and the bearing on the transmission shaft is fully protected.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical transmission seals, and in particular to a transmission shaft seal assembly, a transmission shaft, and a motor. Background Art

[0002] The drive shaft is an important structural component in the motor. Bearings are usually installed on the drive shaft. The drive shaft and the bearings cooperate to achieve power transmission.

[0003] In some harsh application scenarios, there may be serious situations where water may drip or even accumulate and submerge the motor's drive shaft. At this time, if there is no reliable rotating seal at the fit between the drive shaft and the bearing, water and mud can easily enter the bearing chamber through the fit clearance between the drive shaft and the bearing. In mild cases, the entry of water will cause the grease emulsification to fail and a good oil film cannot be formed, causing friction and heat in the bearing and eventually wear and tear. In severe cases, gravel or dust will enter, causing wear of the bearing rolling elements and raceways in a very short time, damaging the bearing and causing great economic losses. Summary of the Invention

[0004] In order to solve at least one aspect of the technical problems existing in the background technology, the present application provides a transmission shaft sealing assembly that can achieve multi-pass sealing, improve the sealing effect, and fully protect the bearings on the transmission shaft.

[0005] A second aspect of the present application provides a transmission shaft assembly.

[0006] A third aspect of the present application provides a motor.

[0007] The technical solutions adopted in this application are:

[0008] A first embodiment of the present application provides a transmission shaft sealing assembly, comprising:

[0009] A filter unit and a bearing isolator unit sleeved on the bearing mounting section of the transmission shaft;

[0010] The bearing isolator unit is buckled with the bearing, and the filter unit is connected to the bearing isolator unit and is located on a side of the bearing isolator unit facing away from the bearing.

[0011] According to the drive shaft sealing assembly provided by the first aspect of the present application, by setting the combined structure between the filtering unit and the bearing isolator unit, the effect of multi-channel sealing is achieved. Specifically, the drive shaft sealing assembly includes a filtering unit and a bearing isolator unit, both of which are sleeved on the bearing installation section of the drive shaft. Along the installation direction of the bearing, they are, in sequence, the filtering unit and the bearing isolator unit. That is, the filtering unit is closer to the shaft end of the drive shaft compared to the bearing isolator unit. In this way, the filtering unit forms the first seal, which can effectively filter out dust and grit in the liquid, ensuring that the clean liquid entering the front end of the bearing isolator unit is basically free of hard solid particles. Further, the bearing isolator unit forms the second seal, which can prevent the entry of dust and liquid from the outside and prevent the leakage of grease from the inside, keeping the bearing operating environment in a good state and significantly extending the service life of the bearing. In summary, the drive shaft sealing assembly provided by the first aspect of the present application can achieve multi-channel sealing, improve the sealing effect, and fully protect the bearing on the drive shaft.

[0012] The technical solution provided by the present application also includes the following additional technical features:

[0013] According to an embodiment of the present application, the drive shaft sealing assembly further includes a bearing inner cover unit, and the bearing inner cover unit is sleeved on the drive shaft and is disposed opposite to the bearing isolator unit;

[0014] The bearing inner cover unit is buckled to the bearing.

[0015] According to an embodiment of the present application, the bearing inner cover unit includes a bearing inner cover body and a shaft sleeve, and the shaft sleeve is in interference fit with the bearing inner cover body;

[0016] The bearing inner cover body forms an accommodation cavity adapted to accommodate the bearing.

[0017] According to an embodiment of the present application, the filtering unit includes a first pressing plate, a filtering element, and a second pressing plate;

[0018] The filtering element is clamped between the first pressing plate and the second pressing plate;

[0019] The filtering element is provided with a first shaft assembly hole adapted for the drive shaft to pass through, and the drive shaft is in interference fit with the first shaft assembly hole.

[0020] According to an embodiment of the present application, the filtering element includes felt.

[0021] According to an embodiment of the present application, the bearing isolator unit includes a bearing outer cover and an isolator. The bearing outer cover is formed with an oil seal assembly hole, and the isolator is embedded in the oil seal assembly hole;

[0022] A second shaft assembly hole adapted for the transmission shaft to pass through is formed in the isolator;

[0023] The filtering unit is connected to the bearing outer cover.

[0024] According to an embodiment of the present application, along the direction close to the bearing, a first polytetrafluoroethylene sheet, a second polytetrafluoroethylene sheet and a third polytetrafluoroethylene sheet are sequentially arranged at the lip of the isolator;

[0025] The ends of the first polytetrafluoroethylene sheet and the second polytetrafluoroethylene sheet are folded away from the bearing, and the end of the third polytetrafluoroethylene sheet is folded towards the bearing.

[0026] According to an embodiment of the present application, the thicknesses of the first polytetrafluoroethylene sheet, the second polytetrafluoroethylene sheet and the third polytetrafluoroethylene sheet are 0.5 mm to 1.5 mm.

[0027] An embodiment of the second aspect of the present application provides a transmission shaft assembly, including a transmission shaft, a bearing and the transmission shaft sealing assembly in any one of the above-mentioned first aspect embodiments;

[0028] The bearing is sleeved on the transmission shaft;

[0029] The transmission shaft sealing assembly is sleeved on the transmission shaft and is adapted to seal the bearing.

[0030] An embodiment of the third aspect of the present application provides a motor, including the transmission shaft sealing assembly in any one of the above-mentioned first aspect embodiments, or the transmission shaft assembly in any one of the above-mentioned second aspect embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0032] Figure 1 is an exploded structural schematic diagram of the transmission shaft sealing assembly provided by the embodiment of the present application;

[0033] Figure 2 is a combined structural schematic diagram of the transmission shaft sealing assembly provided by the embodiment of the present application;

[0034] Figure 3 is Figure 2 the A-A cross-sectional view shown;

[0035] Figure 4 is Figure 3 the enlarged schematic diagram of the structure at C shown;

[0036] Figure 5 Schematic diagram of the exploded structure of the filtering unit provided by an embodiment of the present application;

[0037] Figure 6 Schematic diagram of the exploded structure of the bearing isolator unit provided by an embodiment of the present application;

[0038] Figure 7 Schematic diagram of the structure of the bearing inner cover unit provided by an embodiment of the present application.

[0039] Among them,

[0040] 1. Filtering unit; 11. First pressing plate; 12. Filtering element; 13. Second pressing plate;

[0041] 2. Bearing isolator unit; 21. Bearing outer cover; 22. Isolator; 221. First polytetrafluoroethylene sheet; 222. Second polytetrafluoroethylene sheet; 223. Third polytetrafluoroethylene sheet;

[0042] 3. Bearing inner cover unit; 31. Bearing inner cover body; 32. Bush;

[0043] 4. Transmission shaft;

[0044] 5. Bearing. Detailed implementation manners

[0045] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail by way of examples in conjunction with the accompanying drawings of the specification.

[0046] In the following description, many specific details are set forth in order to fully understand the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that, without conflict, the embodiments of the present application and the features in each embodiment may be combined with each other.

[0047] In addition, in the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0048] In this application, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In this application, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0050] As Figures 1 to 7 shown, an embodiment of the first aspect of this application provides a drive shaft sealing assembly, including a filtering unit 1 sleeved on the bearing mounting section of the drive shaft 4 and a bearing isolator unit 2; the bearing isolator unit 2 is buckled on the bearing 5, the filtering unit 1 is connected to the bearing isolator unit 2, and is located on the side of the bearing isolator unit 2 facing away from the bearing 5.

[0051] The drive shaft 4 in the embodiment of this application can be the drive shaft on a motor drive, or the drive shaft in a power transmission member. The bearing 5 is sleeved on the drive shaft 4, and the drive shaft 4 rotates in cooperation with the bearing 5. In addition, the motor drive and the power transmission member can be applied to multiple scenarios such as power generation and coal mining. Correspondingly, the drive shaft sealing assembly can achieve the effect of multiple seals.

[0052] The bearing mounting section refers to the part of the drive shaft 4 where the bearing 5 is installed. The bearing isolator unit 2 and the filtering unit 1 can be combined into an integral assembly and then sleeved on the drive shaft 4. The bearing isolator unit 2 and the filtering unit 1 can be connected by bolts. In order to further ensure the connection strength and sealing effect, welding can also be used for connection. Of course, on the drive shaft 4, the bearing isolator unit 2 can also be installed first, and then the filtering unit 1. The embodiments of this application do not make specific limitations on the above.

[0053] In addition, the assembly between the above-mentioned filtering unit 1, bearing isolator unit 2, transmission shaft 4, and bearing 5, as well as the assembly between the internal unit structural members, can be provided with a rabbet for concentric positioning to improve the assembly accuracy and thus ensure the sealing effect. The transmission shaft 4 can also have a bearing shoulder that mates with the inner ring of the bearing 5 and a step that contacts and seals with the filtering unit 1 and the bearing isolator unit 2, and both need to be machined to a roughness with a Ra value of 0.2 to 0.8.

[0054] According to the transmission shaft sealing assembly provided by the first aspect embodiment of the present application, by setting the combined structure between the filtering unit 1 and the bearing isolator unit 2, the effect of multi-stage sealing is achieved. Specifically, the transmission shaft sealing assembly includes a filtering unit 1 and a bearing isolator unit 2, both of which are sleeved on the bearing installation section of the transmission shaft 4. Along the installation direction of the bearing 5, they are, in sequence, the filtering unit 1 and the bearing isolator unit 2. That is, the filtering unit 1 is closer to the shaft end of the transmission shaft 4 than the bearing isolator unit 2. In this way, the filtering unit 1 forms the first-stage seal, which can effectively filter out dust and grit in the liquid, ensuring that the clean liquid entering the front end of the bearing isolator unit 2 is basically free of hard solid particles. Further, the bearing isolator unit 2 forms the second-stage seal, which can prevent the entry of dust and liquid from the outside and prevent the leakage of grease from the inside, keeping the operating environment of the bearing 5 in a good state and significantly extending the service life of the bearing 5. In summary, the transmission shaft sealing assembly provided by the first aspect embodiment of the present application can achieve multi-stage sealing, improve the sealing effect, and fully protect the bearing on the transmission shaft.

[0055] As Figures 1 to 3 shown, in some embodiments of the present application, the transmission shaft sealing assembly further includes a bearing inner cover unit 3. The bearing inner cover unit 3 is sleeved on the transmission shaft 4 and is disposed opposite to the bearing isolator unit 2; the bearing inner cover unit 3 is buckled on the bearing 5. The bearing inner cover unit 3 and the bearing isolator unit 2 embrace the bearing 5 on both sides of the bearing 5. The bearing 5 is disposed between the bearing inner cover unit 3 and the bearing isolator unit 2. The bearing inner cover unit 3 and the bearing isolator unit 2 can provide 360-degree all-round sealing protection for the bearing 5, improving the sealing effect.

[0056] As Figure 3 and Figure 7 shown, in some embodiments of the present application, the bearing inner cover unit 3 includes a bearing inner cover body 31 and a shaft sleeve 32. The shaft sleeve 32 is in interference fit with the bearing inner cover body 31; the bearing inner cover body 31 forms a receiving cavity suitable for receiving the bearing 5. The bearing 5 is placed in the receiving cavity on the bearing inner cover body 31. The interference fit between the shaft sleeve 32 and the bearing inner cover body 31 can ensure the firm installation of the shaft sleeve 32 on the bearing inner cover body 31, avoiding the detachment of the shaft sleeve 32. The shaft sleeve 32 can reduce the friction risk between the bearing inner cover body 31 and the transmission shaft 4.

[0057] Furthermore, the bushing 32 can be a copper alloy bushing. The copper alloy bushing has high strength, can withstand high loads, and ensures the normal operation of the transmission shaft 4. The copper alloy bushing has a low friction coefficient during operation, can reduce friction, thereby reducing wear and energy consumption between the transmission shaft 4, and extending the service life of the transmission shaft 4. The copper alloy bushing has good wear resistance, can withstand high loads and high-speed friction, and can still maintain stable performance after long-term use, reducing the number of repairs. The copper alloy bushing has excellent corrosion resistance and can be used for a long time in a humid environment, suitable for harsh working environments.

[0058] As Figure 1 , Figures 3 to 5 shown, in some embodiments of the present application, the filtering unit 1 includes a first pressing plate 11, a filtering member 12 and a second pressing plate 13; the filtering member 12 is clamped between the first pressing plate 11 and the second pressing plate 13; a first shaft assembly hole adapted for the transmission shaft 4 to pass through is formed in the filtering member 12, and the transmission shaft 4 is in interference fit with the first shaft assembly hole. The filtering member 12 can filter out dust and grit in the liquid, ensuring that the clean liquid entering the front end of the bearing isolator unit 2 is basically free of hard solid particles. The filtering member 12 and the transmission shaft 4 are in interference fit through the first shaft assembly hole, which can prevent gaps from appearing between the first shaft assembly hole and the transmission shaft 4, resulting in the leakage of hard solid particles, and fully ensuring the sealing and filtering effects. The first pressing plate 11 and the second pressing plate 13 can play a role in strengthening and fixing the filtering member 12, preventing the filtering member 12 from loosening under the scouring of the liquid.

[0059] Furthermore, the filtering member 12 is usually an elastomer, which is convenient for interference fit with the shaft surface of the transmission shaft 4 and ensures a small interference amount. In this way, the contact pressure between the filtering member 12 and the transmission shaft 4 is small, which can not only ensure the sealing and filtering effects, but also does not affect the rotation of the transmission shaft 4.

[0060] In some embodiments of the present application, the filtering member 12 includes felt. Felt has excellent properties such as oil absorption, oil return, etc. It can maintain a constant sealing pressure under harsh conditions or during wear. In addition, its surface will not be polished during wear. Before assembly, the felt should be treated with oil immersion, which can prevent the felt from being worn out due to dry grinding and shortening its service life in general operating environments.

[0061] As Figure 1 , Figure 3 and Figure 6As shown, in some embodiments of the present application, the bearing isolator unit 2 includes a bearing outer cover 21 and an isolator 22. An oil seal assembly hole is formed on the bearing outer cover 21, and the isolator 22 is embedded in the oil seal assembly hole; a second shaft assembly hole adapted for the transmission shaft 4 to pass through is formed on the isolator 22; the filter unit 1 is connected to the bearing outer cover 21. The bearing outer cover 21 can protect the isolator 22. The isolator 22 can be pressed into the oil seal assembly hole in an interference fit manner to ensure the assembly strength. The isolator 22 forms a second seal here, which can prevent dust and liquid from entering from the outside and prevent grease leakage from the inside, keeping the operating environment of the bearing 5 in a good state all the time and significantly extending the service life of the bearing 5.

[0062] Furthermore, an O-ring can be installed on the outer diameter of the isolator 22 to ensure a gapless fit between the isolator 22 and the oil seal assembly hole and improve the sealing performance.

[0063] As Figures 3 to 4 shown, in some embodiments of the present application, along the direction close to the bearing 5, a first polytetrafluoroethylene sheet 221, a second polytetrafluoroethylene sheet 222, and a third polytetrafluoroethylene sheet 223 are sequentially arranged at the lip of the isolator 22; the ends of the first polytetrafluoroethylene sheet 221 and the second polytetrafluoroethylene sheet 222 are folded away from the bearing 5, and the end of the third polytetrafluoroethylene sheet 223 is folded towards the bearing 5.

[0064] Specifically, the isolator 22 generally includes an outer metal skeleton structure, and the first polytetrafluoroethylene sheet, the second polytetrafluoroethylene sheet 222, and the third polytetrafluoroethylene sheet 223 are arranged in the metal skeleton structure. An O-ring can also be arranged on the mating surface between the outer metal skeleton structure and the transmission shaft 4 to improve the sealing performance. The polytetrafluoroethylene sheet has a self-lubricating function and can achieve good lubrication during dry grinding. The polytetrafluoroethylene sheet also has excellent flame retardancy, stability, good electrical insulation performance, mechanical properties, high heat resistance, outstanding oil resistance, solvent resistance and wear resistance, good moisture resistance and low temperature resistance, etc. The ends of the first polytetrafluoroethylene sheet 221 and the second polytetrafluoroethylene sheet 222 are folded away from the bearing 5, that is, bent towards the direction of the filter unit 1, which can form a blocking effect on the liquid flowing from the direction of the filter unit 1 and prevent the liquid from entering the sealed cavity where the bearing 5 is located. The two outward folds can achieve the purpose that if one is damaged, the other is still effective, realizing an extended service life. The end of the third polytetrafluoroethylene sheet 223 is folded towards the bearing 5, which can prevent the sealed lubricant from leaking out of the sealed cavity where the bearing 5 is located.

[0065] In some embodiments of the present application, the thickness of the first PTFE sheet 221, the second PTFE sheet 222, and the third PTFE sheet 223 is 0.5 mm to 1.5 mm. Limiting the thickness of the PTFE sheet can prevent excessive space inside the separator 22 from being occupied by excessive thickness, and can also prevent sealing failure due to excessive thickness from breaking.

[0066] Furthermore, the thicknesses of the first PTFE sheet 221, the second PTFE sheet 222, and the third PTFE sheet 223 can be freely combined and can be identical, partially identical, or completely different to achieve different sealing effects. A small amount of grease should be applied to the mating area between the drive shaft 4 and the PTFE lip of the isolator 22 to prevent dry wear and shortening the life of the PTFE sheet under normal operating conditions.

[0067] The second aspect embodiment of the present application provides a drive shaft assembly, including a drive shaft 4, a bearing 5 and the drive shaft sealing assembly of any embodiment of the first aspect mentioned above; the bearing 5 is sleeved on the drive shaft 4; the drive shaft sealing assembly is sleeved on the drive shaft 4 and is suitable for sealing the bearing 5.

[0068] Specifically, the drive shaft 4 is sleeved with a bearing 5 and the aforementioned drive shaft seal assembly. When mated, the drive shaft 4 and bearing 5 support the drive shaft 4 and its rotating parts, maintaining a certain degree of rotational accuracy. They also reduce friction and wear between relatively rotating parts. The drive shaft 4 is a mechanical structure that transmits power from one location to another, and the bearing 5 plays a key role in this process. It supports the drive shaft 4, enabling smooth rotation and thus efficient power transmission. The bearing 5 supports the transmission parts through rolling contact, resulting in low sliding resistance, low power consumption, and easy startup. The bearing 5 helps the drive shaft 4 maintain stable operation, preventing vibration or deflection caused by load or speed fluctuations. By reducing friction and wear, the bearing 5 effectively extends the service life of the drive shaft 4 and the entire equipment. The drive shaft seal assembly provides multiple seals on the drive shaft 4, preventing liquids and particulate matter from entering the area where the bearing 5 is located, providing sufficient sealing protection for the bearing 5 and extending its service life.

[0069] According to the drive shaft assembly provided by the second aspect embodiment of the present application, the drive shaft seal assembly thereon realizes the effect of multi-channel sealing by setting the combined structure between the filtering unit 1 and the bearing isolator unit 2. Specifically, the drive shaft seal assembly includes the filtering unit 1 and the bearing isolator unit 2, both of which are sleeved on the bearing installation section of the drive shaft 4. Along the installation direction of the bearing 5, they are the filtering unit 1 and the bearing isolator unit 2 in sequence. That is, the filtering unit 1 is closer to the shaft end of the drive shaft 4 than the bearing isolator unit 2. In this way, the filtering unit 1 forms the first seal, which can effectively filter out dust and grit in the liquid, ensuring that the clean liquid entering the front end of the bearing isolator unit 2 is basically free of hard solid particles. Further, the bearing isolator unit 2 forms the second seal, which can prevent the entry of dust and liquid externally and prevent the leakage of grease internally, keeping the operating environment of the bearing 5 in a good state all the time and significantly extending the service life of the bearing 5. In summary, the drive shaft assembly provided by the second aspect embodiment of the present application realizes multi-channel sealing of the bearing, improves the sealing effect, and fully protects the bearing on the drive shaft.

[0070] The third aspect embodiment of the present application provides a motor, including the drive shaft seal assembly in any embodiment of the first aspect above, or the drive shaft assembly in any embodiment of the second aspect above.

[0071] The motor provided by the embodiment of the present application can be a motor applied to a generator set, or a scraper conveyor motor in coal mine mining, or a power motor in machining equipment, etc.

[0072] According to the motor provided by the third aspect embodiment of the present application, a drive shaft seal assembly is provided on the drive shaft 4. The drive shaft seal assembly realizes the effect of multi-channel sealing by setting the combined structure between the filtering unit 1 and the bearing isolator unit 2. Specifically, the drive shaft seal assembly includes the filtering unit 1 and the bearing isolator unit 2, both of which are sleeved on the bearing installation section of the drive shaft 4. Along the installation direction of the bearing 5, they are the filtering unit 1 and the bearing isolator unit 2 in sequence. That is, the filtering unit 1 is closer to the shaft end of the drive shaft 4 than the bearing isolator unit 2. In this way, the filtering unit 1 forms the first seal, which can effectively filter out dust and grit in the liquid, ensuring that the clean liquid entering the front end of the bearing isolator unit 2 is basically free of hard solid particles. Further, the bearing isolator unit 2 forms the second seal, which can prevent the entry of dust and liquid externally and prevent the leakage of grease internally, keeping the operating environment of the bearing 5 in a good state all the time and significantly extending the service life of the bearing 5. In summary, for the motor provided by the third aspect embodiment of the present application, the sealing effect of the bearing on the drive shaft is good and the service life is long.

[0073] What is not described in the present application can be realized by adopting or referring to the existing technology.

[0074] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other, and the key point of each embodiment is to illustrate the differences from other embodiments.

[0075] The above description is only for the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A drive shaft sealing assembly, characterized in that, Comprising: A filter unit and a bearing isolator unit sleeved on the bearing installation section of a transmission shaft; The bearing isolator unit is buckled on the bearing, the filter unit is connected to the bearing isolator unit and is located on the side of the bearing isolator unit facing away from the bearing.

2. The drive shaft seal assembly according to claim 1, wherein The transmission shaft sealing assembly further includes a bearing inner cover unit sleeved on the transmission shaft and arranged opposite to the bearing isolator unit; The bearing inner cover unit is buckled on the bearing.

3. The drive shaft seal assembly according to claim 2, wherein, The bearing inner cover unit includes a bearing inner cover body and a shaft sleeve, and the shaft sleeve is in interference fit with the bearing inner cover body; The bearing inner cover body forms a receiving cavity adapted to receive the bearing.

4. The drive shaft seal assembly according to claim 1, wherein The filter unit includes a first pressing plate, a filter element and a second pressing plate; The filter element is clamped between the first pressing plate and the second pressing plate; A first shaft assembly hole adapted for the transmission shaft to pass through is formed in the filter element, and the transmission shaft is in interference fit with the first shaft assembly hole.

5. The drive shaft seal assembly according to claim 4, characterized in that, The filter element includes felt.

6. The drive shaft seal assembly according to claim 1, wherein, The bearing isolator unit includes a bearing outer cover and an isolator, an oil seal assembly hole is formed in the bearing outer cover, and the isolator is embedded in the oil seal assembly hole; A second shaft assembly hole adapted for the transmission shaft to pass through is formed in the isolator; The filter unit is connected to the bearing outer cover.

7. The drive shaft seal assembly according to claim 6, wherein In the direction close to the bearing, a first polytetrafluoroethylene sheet, a second polytetrafluoroethylene sheet and a third polytetrafluoroethylene sheet are sequentially arranged at the lip of the isolator; The ends of the first polytetrafluoroethylene sheet and the second polytetrafluoroethylene sheet are folded away from the bearing, and the end of the third polytetrafluoroethylene sheet is folded towards the bearing.

8. The drive shaft seal assembly according to claim 7, characterized in that, The thicknesses of the first polytetrafluoroethylene sheet, the second polytetrafluoroethylene sheet and the third polytetrafluoroethylene sheet are 0.5 mm to 1.5 mm.

9. A drive shaft assembly, characterized in that, Comprising a transmission shaft, a bearing and a transmission shaft sealing assembly according to any one of claims 1 to 8; The bearing is sleeved on the transmission shaft; The transmission shaft sealing assembly is sleeved on the transmission shaft and is adapted to seal the bearing.

10. A motor, characterized in that, Comprising a transmission shaft sealing assembly according to any one of claims 1 to 8, or a transmission shaft assembly according to claim 9.

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