Sealing structure for speed reducer shaft

Abstract

The sealing structure comprises a box body, an input shaft, an output shaft and a gear shaft, one end of the output shaft is connected with the box body through a transparent cover, the other end of the output shaft is connected with the box body through an end cover, the end cover is provided with a sealing cavity, and the end portion of the output shaft is arranged in the sealing cavity in a penetrating mode. A sealing assembly linked with the output shaft is arranged in the sealing chamber and comprises a static ring, a movable ring, a spring seat, a sealing piece, a sealing spring and a pressing ring, the sealing piece is provided with a positioning step, the spring seat is provided with a connecting ring linked with the positioning step, and a limiting ring is further arranged at the end, close to the sealing spring, of the pressing ring. One end of the sealing spring abuts against the end face of the spring seat, the other end of the sealing spring abuts against the end face of the pressing ring, the sealing assembly adopts a mechanical sealing mode, the static ring abuts against the moving ring to form a sealing face, when lubricating oil enters the sealing face, an extremely thin liquid film can be generated on the sealing face, leakage of the lubricating oil can be prevented, the end face can be lubricated, and the long-term sealing effect is ensured.

Description

Technical Field

[0001] This utility model relates to the field of speed reducers, and specifically to a sealing structure for a speed reducer shaft. Background Technology

[0002] A speed reducer is an independent component consisting of gears enclosed in a rigid housing. It is commonly used as a speed reduction transmission device between a prime mover and a driven machine. It plays a role in matching speeds and transmitting torque between the prime mover and the driven machine or actuator, and its applications are extremely widespread in modern machinery.

[0003] Chinese utility model patent with publication number "CN221897082U" discloses a double-seal structure for an intelligent monitoring type reducer, including a reducer body, a rotating shaft, and a connecting bearing. A sealing mechanism is provided on one side of the rotating shaft. The sealing mechanism includes a rotating ring, a rubber ring, and a stationary ring. A sealing ring is provided on one side of the stationary ring. A retaining ring is fixedly connected to the outer wall of the sealing ring. A fixing ring is engaged on one side of the retaining ring. A spring ring is fixedly installed on one side of the retaining ring. A limit ring is fixedly installed on one side of the spring ring.

[0004] However, the aforementioned gearbox sealing structure still has the following drawbacks:

[0005] First, under high load and high speed conditions, the relative rotation of the stationary ring and the rotating ring of the output shaft will generate a lot of heat. The rubber ring will age faster after being heated, which will lead to a decrease in the performance of the sealing structure. In addition, the sealing mechanism has many components and the assembly process is relatively complicated.

[0006] Secondly, when the stationary and rotating rings move relative to each other, heat is generated. This heat causes the air at the connection between the sealing structure and the housing to expand, and the heat is also transferred to the housing, resulting in an increase in the gap at the connection between the sealing structure and the housing. In addition, the internal air pressure will impact the gap, causing the sealing structure to fail and resulting in leakage.

[0007] Therefore, it is necessary to improve upon the aforementioned shortcomings. Utility Model Content

[0008] The purpose of this utility model is to provide a sealing structure for a reducer shaft that is simple in structure, easy to assemble, and has stable sealing performance, so as to solve the above-mentioned problems existing in the prior art.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a sealing structure for a reducer shaft, including a housing, an input shaft, an output shaft, and a gear shaft for linking the input shaft and the output shaft. A first skeleton oil seal is provided at the connection between the input shaft and the housing. One end of the output shaft is connected to the housing through a through cover, and the other end is connected to the housing through an end cover. A second skeleton oil seal is provided at the connection between the output shaft and the through cover. The end cover has a sealing cavity. The end of the output shaft passes through the sealing cavity. A sealing assembly linked with the output shaft is provided in the sealing cavity. The sealing assembly includes a stationary ring on the end cover, a rotating ring abutting against the end face of the stationary ring, a spring seat linked with the rotating ring, a sealing element provided in the spring seat, a sealing spring for maintaining the linkage between the rotating ring and the stationary ring, and a pressure ring fixed on the rotating shaft. The pressure ring is linked with the output shaft through a fastening pin. The sealing element has a positioning step. The spring seat has a connecting ring linked with the positioning step. A limiting ring is also provided near the end of the sealing spring of the pressure ring. One end of the sealing spring abuts against the end face of the spring seat, and the other end abuts against the end face of the pressure ring.

[0010] By adopting the above technical solution: Due to the inverted installation of the reducer, the horizontal position of the connection between the input shaft and the housing is higher than that of the connection between the output shaft and the housing. Lubricating oil will accumulate below the output shaft. Because the output shaft bears a large load, the risk of oil leakage using a skeleton oil seal below the output shaft is high. However, by setting a sealing cavity on the end cover below the output shaft, and placing a sealing assembly within the sealing cavity, the sealing assembly uses a mechanical seal. The stationary ring is located at the connection between the output shaft and the end cover, and the rotating ring rotates with the output shaft. The stationary ring and the rotating ring abut against each other to form a sealing surface. When lubricating oil enters the sealing surface, a very thin liquid film is generated, which can prevent lubricating oil leakage and also lubricate the end face, ensuring a long-term sealing effect. The seal can also seal the connection between the rotating ring and the output shaft, preventing oil leakage inside the housing. Oil seeps out from the gap at the connection between the rotating ring and the output shaft. The spring seat and the pressure ring compress and limit the sealing spring. The sealing spring abuts against the end face of the spring seat and the pressure ring. The spring seat is engaged with the positioning step through the connecting ring. Under the action of the sealing spring, it moves in conjunction with the sealing element. That is, the sealing spring pushes the spring seat, which in turn pushes the sealing element to always keep it in contact with the rotating ring, and the sealing element abuts against the rotating ring. When the rotating ring and the stationary ring wear due to relative movement, the rotating ring is pushed by the sealing element to re-engage, thus ensuring the sealing ability of the sealing assembly. In addition, the pressure ring is locked on the output shaft by a fastening pin. Adjusting the fastening pin can adjust the position of the pressure ring relative to the output shaft, thereby adjusting the elastic potential energy of the sealing spring. At the same time, the limiting ring can limit the end of the sealing spring to prevent the sealing spring from detaching from the pressure ring and the spring seat, ensuring the stability and effectiveness of the sealing assembly.

[0011] The aforementioned reducer shaft sealing structure can be further configured as follows: a sealing ring is provided at the connection between the cover and the housing, a gasket is provided between the stationary ring and the end cover, a cover is provided at the opening of the sealing cavity, the cover is hinged to the end cover, the cover is also provided with a venting cavity, the end cover is provided with a first vent hole through the sealing cavity, the cover is provided with a second vent hole through the exhaust cavity, and a vent cap is provided inside the first vent hole and the second vent hole.

[0012] By adopting the above technical solution: the sealing ring can further improve the stability of the connection between the cover and the housing, and at the same time seal the gap at the connection. The gasket can better adapt to the small uneven surfaces between the stationary ring and the end cover, playing a dual role of buffering and sealing. The cover is hinged at the opening of the sealing cavity of the end cover, so that the opening of the sealing cavity can be easily opened and closed, and the output shaft and sealing components inside the sealing cavity can be easily inspected, maintained or replaced. In addition, since the sealing component forms a sealing surface through the connection of the stationary ring and the moving ring and ensures the sealing ability through relative movement, heat will be generated, which will cause the air pressure inside the sealing cavity to increase. By opening a first vent hole in the sealing cavity and a second vent hole on the side of the cover, and setting vent caps with different exhaust thresholds in the first vent hole and the second vent hole, when the pressure inside the sealing cavity is too high, the exhaust capacity of the first vent hole is not enough to completely release the internal pressure. The air pressure is then improved by the second vent hole connected to the vent cavity, which can balance the pressure inside the sealing cavity with the external atmospheric pressure and prevent the sealing structure from failing due to excessive pressure difference.

[0013] The aforementioned reducer shaft sealing structure can be further configured as follows: the output shaft is provided with a first positioning boss and a second positioning boss, a first roller bearing is provided between the first positioning boss and the through cover, a transmission gear and a second roller bearing are provided between the second positioning boss and the end cover, the output shaft is provided with a fixing key, the transmission gear is engaged with the fixing key to achieve linkage with the output shaft, and the transmission gear meshes with the gear shaft.

[0014] By adopting the above technical solution: the first positioning boss and the second positioning boss provide axial positioning for the output shaft. A first roller bearing is set between the first positioning boss and the through cover, and a second roller bearing is set between the second positioning boss and the end cover. The roller bearings can withstand a large radial load, which improves the running stability of the output shaft and reduces shaft sway and vibration. In addition, the fixing key of the output shaft is engaged with the transmission gear, which ensures a tight linkage between the transmission gear and the output shaft, ensures reliable torque transmission, improves the compactness and stability of the reducer, reduces the risk of failure, and improves the overall performance of the reducer.

[0015] The aforementioned reducer shaft sealing structure can be further configured as follows: a square-headed tube plug is provided on the housing, a third roller bearing and a fourth roller bearing are respectively provided at both ends of the gear shaft, a reduction gear that is linked to the input shaft is snapped on the gear shaft, and a spacer ring for positioning the reduction gear is also provided on the gear shaft.

[0016] By adopting the above technical solution: the square-headed plug can be opened when needed to inspect the inside of the reducer, so as to detect potential problems in time, such as whether the gears have cracks, pitting, or other signs of damage, or whether the bearings have discoloration or wear. At the same time, when the reducer lubricating oil needs to be changed, the square-headed plug can also be used as an oil drain port. Opening the square-headed plug allows the old lubricating oil to drain smoothly, avoiding the old oil residue inside the reducer, which would affect the lubrication effect of the new oil and the performance of the reducer. In addition, the third and fourth roller bearings provide stable rotational support for the gear shaft, ensuring the precise rotation of the gear shaft under high speed and heavy load conditions, reducing shaft bending deformation, and thus ensuring the reliability of the linkage between the reduction gear and the input and output shafts. The spacer ring can ensure the precise axial position of the reduction gear, preventing the reduction gear from being displaced under the action of axial force, avoiding vibration and noise problems caused by gear position deviation, and improving the smoothness of the reducer operation.

[0017] The aforementioned reducer shaft sealing structure can be further configured as follows: the input shaft is provided with a fixed cover, the input shaft is provided with a fifth roller bearing and a sixth roller bearing, the input shaft is also provided with a first mounting step and a second mounting step, the fixed cover is provided with a fixed ring, one end of the fifth roller bearing abuts against the end of the fixed ring and the other end abuts against the end face of the first mounting step, one end of the sixth roller bearing abuts against the housing and the other end abuts against the end face of the second mounting step.

[0018] By adopting the above technical solution: the fixed cover on the input shaft can stably fix the input shaft, effectively blocking external impurities and dust from entering the reducer, protecting internal parts from contamination, and extending service life. One end of the fifth roller bearing abuts against the end of the fixed ring of the fixed cover, and the other end abuts against the end face of the first mounting step. One end of the sixth roller bearing abuts against the housing, and the other end abuts against the end face of the second mounting step. This ensures that the input shaft is reliably supported in both the radial and axial directions, enhancing shaft stability, reducing vibration and shaking, and improving the smoothness of reducer operation. Especially under high-speed or heavy-load conditions, it ensures the accuracy and reliability of power transmission, prevents bearing displacement under axial force, avoids additional wear and failure risks caused by bearing position misalignment, and further improves the reliability and durability of the reducer.

[0019] The aforementioned reducer shaft sealing structure can be further configured such that: the end of the input shaft near the fifth roller bearing is tapered, a key block is provided on the end face of the input shaft near the fifth roller bearing, and a keyway is provided on the other end.

[0020] By adopting the above technical solution: the tapered end of the input shaft can better cooperate with other components, optimize the stability and sealing of the connection between the input shaft and the transmission mechanism, and the tapered end cooperates with the key block at the end, while the other end is provided with a keyway, which can reduce the assembly complexity of other structures and the input shaft, reduce errors in the assembly process, ensure the reliability and accuracy of power transmission, and thus improve the reliability of the overall structure.

[0021] The beneficial effects of this utility model are as follows:

[0022] First, a sealing cavity is set at the end cover of the output shaft. The gap at the connection between the output shaft and the end cover is sealed by a mechanical sealing assembly. Compared with the traditional skeleton oil seal, the sealing assembly adopts a combination of stationary ring and rotating ring. The stationary ring is fixed on the end cover and the rotating ring is fixed on the output shaft. The gap between the stationary ring and the output shaft will filter out larger impurities in the lubricating oil and enter the side of the sealing surface of the stationary ring and the rotating ring. When the stationary ring and the rotating ring rotate relative to each other, some oil will enter the sealing surface and form a liquid film on the sealing surface, which can prevent lubricating oil leakage and also lubricate the sealing surface, reduce the wear of the rotating ring and the stationary ring, and extend the service life of the sealing assembly.

[0023] Secondly, a first vent hole is provided on the end cap, and a vent cavity and a second vent hole are provided on the sealing cap. When the air pressure in the sealing cavity increases abnormally, the vent cap in the first vent hole on the sealing cavity first discharges the internal air pressure to ensure the air pressure in the sealing cavity is stable. When the exhaust capacity of the first vent hole is insufficient to maintain the air pressure stability in the sealing cavity, the gas in the sealing cavity passes through the vent cavity and is further depressurized through the vent cap in the second vent hole. This significantly improves the air pressure stability in the sealing cavity, prevents excessive air pressure from impacting the sealing assembly, and improves the stability of the sealing assembly structure.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 Appendix of this utility model Figure 1 Enlarged schematic diagram of section A in the middle;

[0027] Figure 3 Appendix of this utility model Figure 1 Enlarged schematic diagram of section B;

[0028] Figure 4 Appendix of this utility model Figure 1 Enlarged schematic diagram of section C in the middle;

[0029] Label annotations: 1. Housing; 11. Square-headed pipe plug; 2. Input shaft; 21. First skeleton oil seal; 22. Fixing cover; 22. Fixing ring; 221. First mounting step; 23. Second mounting step; 24. Key block; 25. Keyway; 26. Fifth roller bearing; 27. Sixth roller bearing; 28. Output shaft; 3. Through cover; 31. Sealing ring; 311. End cover; 32. Sealing cavity; 321. Washer; 322. Sealing cover; 323. Vent cavity; 324. First vent hole; 325. Second vent hole; 326. Vent cap; 327. Second skeleton oil seal. 33. Sealing assembly 34. Stationary ring 341. Moving ring 342. Spring seat 343. Seal 344. Sealing spring 345. Pressure ring 346. Fastening pin 3461. Positioning step 347. Connecting ring 348. Limiting ring 349. First positioning boss 35. Second positioning boss 36. First roller bearing 37. Second roller bearing 38. Transmission bearing 39. Fixing key 3911. Gear shaft 4. Third roller bearing 41. Fourth roller bearing 42. Reduction gear 43. Spacer ring 44. Detailed Implementation

[0030] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] like Figures 1 to 4 The reducer shaft sealing structure shown includes a housing 1, an input shaft 2, an output shaft 3, and a gear shaft 4 for linkage between the input shaft 2 and the output shaft 3. A first skeleton oil seal 21 is provided at the connection between the input shaft 2 and the housing 1. One end of the output shaft 3 is connected to the housing 1 through a cover 31, and the other end is connected to the housing 1 through an end cover 32. A second skeleton oil seal 33 is provided at the connection between the output shaft 3 and the cover 31. The end cover 32 has a sealing cavity 321, and the end of the output shaft 3 passes through the sealing cavity 321. A sealing assembly 34 that is linked with the output shaft 3 is provided in the sealing cavity 321. The sealing assembly 34 includes a stationary ring 341 disposed on the end cover 32 and a stationary ring 341. The rotating ring 342 with its end face abutting, the spring seat 343 linked with the rotating ring 342, the seal 344 provided in the spring seat 343, the sealing spring 345 used to keep the rotating ring 342 linked with the stationary ring 341, and the pressure ring 346 fixed on the output shaft 3. The pressure ring 346 is linked with the output shaft 3 through the fastener 3461. The seal 344 is provided with a positioning step 347. The spring seat 343 is provided with a connecting ring 348 linked with the positioning step 347. The pressure ring 346 is also provided with a limiting ring 349 near the end of the sealing spring 345. One end of the sealing spring 345 abuts with the end face of the spring seat 343 and the other end abuts with the end face of the pressure ring 346.

[0032] A sealing ring 311 is provided at the connection between the cover 31 and the housing 1. A gasket 322 is provided between the stationary ring 341 and the end cover 32. The opening of the sealing cavity 321 is covered by a cover 323. The cover 323 is hinged to the end cover 32. The cover 323 is also provided with a venting cavity 324. The end cover 32 passes through the sealing cavity 321 and is provided with a first venting hole 325. The cover 323 is connected to the exhaust cavity and is provided with a second venting hole 326. A venting cap 327 is provided inside the first venting hole 325 and the second venting hole 326.

[0033] Because the reducer is inverted, the sealing cavity 321 is located below the housing 1. Due to the large load on the output shaft 3, the risk of oil leakage using a skeleton oil seal below the output shaft 3 is high. Instead, a sealing cavity 321 is provided on the end cover 32 below the output shaft 3, and a sealing assembly 34 is installed inside the sealing cavity 321. The sealing assembly 34 uses a mechanical seal. The stationary ring 341 is located at the connection between the output shaft 3 and the end cover 32. The rotating ring 342 rotates with the output shaft 3. The stationary ring 341 and the rotating ring 342 abut against each other to form a sealing surface. When lubricating oil enters the sealing surface, a very thin liquid film is generated, which can prevent lubricating oil leakage and also lubricate the end face, ensuring a long-term sealing effect. The seal 344 seals the connection between the rotating ring 342 and the output shaft 3, preventing oil from seeping out of the housing 1 from the gap between the rotating ring 342 and the output shaft 3. The spring seat 343 and the pressure ring 346 compress and limit the sealing spring 345. Spring 345 abuts against the end face of spring seat 343 and pressure ring 346. Spring seat 343 is engaged with positioning step 347 through connecting ring 348. Under the action of sealing spring 345, it is linked with sealing element 344. That is, sealing spring 345 pushes spring seat 343 and then pushes sealing element 344 to always fit against moving ring 342, and sealing element 344 abuts against moving ring 342. When moving ring 342 and stationary ring 341 wear due to relative movement, moving ring 342 is pushed by sealing element 344 to fit again, ensuring the sealing ability of sealing assembly 34. In addition, pressure ring 346 is locked on output shaft 3 by fastening pin 3461. Adjusting fastening pin 3461 can adjust the position of pressure ring 346 relative to output shaft 3, thereby adjusting the elastic potential energy of sealing spring 345. At the same time, limiting ring 349 can limit the end of sealing spring 345 to prevent sealing spring 345 from disengaging from pressure ring 346 and spring seat 343, ensuring the stability and effectiveness of sealing assembly 34.

[0034] The sealing ring 311 further improves the stability of the connection between the cover 31 and the housing 1, while sealing the gap at the connection. The gasket 322 can better adapt to the slight unevenness between the stationary ring 341 and the end cover 32, playing a dual role of buffering and sealing. The cover 323 is hinged to the opening of the sealing cavity 321 of the end cover 32, which allows the opening of the sealing cavity 321 to be opened and closed easily, facilitating the inspection, maintenance, or replacement of the output shaft 3 and the sealing assembly 34 inside the sealing cavity 321. In addition, since the sealing assembly 34 forms a sealing surface through the connection between the stationary ring 341 and the moving ring 342 and their relative movement ensures the seal, the sealing is further enhanced. The pressure inside the sealed cavity 321 increases due to the heat generated. By opening a first vent 325 in the sealed cavity 321 and a second vent 326 on the side of the cover 323, and by setting vent caps 327 with different exhaust thresholds on the first vent 325 and the second vent 326, when the pressure inside the sealed cavity 321 is too high and the exhaust capacity of the first vent 325 is insufficient to completely release the internal pressure, the pressure is further released through the second vent 326 connected to the vent cavity 324 to improve the pressure relief efficiency. This can balance the pressure inside the sealed cavity 321 with the external atmospheric pressure and prevent the sealing structure from failing due to excessive pressure difference.

[0035] The input shaft 2 is provided with a fixed cover 22, a fifth roller bearing 27 and a sixth roller bearing 28, a first mounting step 23 and a second mounting step 24, a fixed ring 221 on the fixed cover 22, one end of the fifth roller bearing 27 abuts against the end of the fixed ring 221 and the other end abuts against the end face of the first mounting step 23, and one end of the sixth roller bearing 28 abuts against the housing 1 and the other end abuts against the end face of the second mounting step 24. The fixed cover 22 on the input shaft 2 can stably fix the input shaft 2, effectively blocking external impurities and dust from entering the reducer, protecting internal parts from contamination, and extending service life. One end of the fifth roller bearing 27 abuts against the end of the fixed ring 221 of the fixed cover 22, and the other end abuts against the end face of the first mounting step 23. One end of the sixth roller bearing 28 abuts against the housing 1, and the other end abuts against the end face of the second mounting step 24. This ensures that the input shaft 2 is reliably supported in both the radial and axial directions, enhancing shaft stability, reducing vibration and shaking, and improving the smoothness of reducer operation. Especially under high-speed or heavy-load conditions, it ensures the accuracy and reliability of power transmission, prevents bearing displacement under axial force, avoids additional wear and failure risks caused by bearing position misalignment, and further improves the reliability and durability of the reducer.

[0036] The input shaft 2 has a tapered end near the fifth roller bearing 27. A key block 25 is provided on the end face of this end, and a keyway 26 is provided on the other end. The tapered end of the input shaft 2 allows for better fit with other components, optimizing the stability and sealing of the connection between the input shaft 2 and the transmission mechanism. The tapered end, combined with the key block 25 and the keyway 26, reduces the assembly complexity between the input shaft 2 and other structures, minimizes errors during assembly, ensures the reliability and accuracy of power transmission, and thus improves the overall structural reliability.

[0037] The output shaft 3 is provided with a first positioning boss 35 and a second positioning boss 36. A first roller bearing 37 is provided between the first positioning boss 35 and the through cover 31. A transmission gear 39 and a second roller bearing 38 are provided between the second positioning boss 36 and the end cover 32. The output shaft 3 is provided with a fixing key 391. The transmission gear 39 is engaged with the fixing key 391 to achieve linkage with the output shaft 3. The transmission gear 39 meshes with the gear shaft 4. The first positioning boss 35 and the second positioning boss 36 provide axial positioning for the output shaft 3. A first roller bearing 37 is provided between the first positioning boss 35 and the cover 31, and a second roller bearing 38 is provided between the second positioning boss 36 and the end cover 32. The roller bearings can withstand large radial loads, which improves the running stability of the output shaft 3 and reduces shaft sway and vibration. In addition, the fixing key 391 of the output shaft 3 is engaged with the transmission gear 39, which ensures a tight linkage between the transmission gear 39 and the output shaft 3, ensures reliable torque transmission, improves the compactness and stability of the reducer, reduces the risk of failure, and improves the overall performance of the reducer.

[0038] The housing 1 is provided with a square-headed tube plug 11. The gear shaft 4 is provided with a third roller bearing 41 and a fourth roller bearing 42 at both ends. The gear shaft 4 is fitted with a reduction gear 43 that is linked to the input shaft 2. The gear shaft 4 is also provided with a spacer ring 44 for positioning the reduction gear 43. The square-headed plug 11 can be opened when needed to inspect the inside of the reducer, allowing for the timely detection of potential problems, such as cracks or pitting on the gears, or discoloration or wear on the bearings. Simultaneously, when the reducer's lubricating oil needs changing, the square-headed plug 11 can serve as a drain port, allowing the old lubricating oil to drain smoothly, preventing it from remaining inside the reducer and affecting the lubrication effect of the new oil and the reducer's performance. Furthermore, the third roller bearing 41 and the fourth roller bearing 42 provide stable rotational support for the gear shaft 4, ensuring precise rotation of the gear shaft 4 under high speed and heavy load conditions, reducing shaft bending deformation, and thus ensuring the reliability of the linkage between the reduction gear 43 and the input shaft 2 and output shaft 3. The spacer ring 44 ensures the precise axial position of the reduction gear 43, preventing displacement of the reduction gear 43 under axial force, avoiding vibration and noise problems caused by gear position deviation, and improving the smoothness of the reducer's operation.

Claims

1. A sealing structure for a reducer shaft, comprising a housing, an input shaft, an output shaft, and a gear shaft for linkage between the input shaft and the output shaft, wherein a first skeleton oil seal is provided at the connection between the input shaft and the housing, one end of the output shaft is connected to the housing via a through cover, and the other end is connected to the housing via an end cover, and a second skeleton oil seal is provided at the connection between the output shaft and the through cover, characterized in that: The end cap is provided with a sealing cavity, and the end of the output shaft passes through the sealing cavity. The sealing cavity is provided with a sealing assembly that is linked to the output shaft. The sealing assembly includes a stationary ring disposed on the end cap, a rotating ring abutting against the end face of the stationary ring, a spring seat that is linked to the rotating ring, a sealing element disposed in the spring seat, a sealing spring for maintaining the linkage between the rotating ring and the stationary ring, and a pressure ring fixed on the rotating shaft. The pressure ring is linked to the output shaft by a fastening pin. The sealing element is provided with a positioning step. The spring seat is provided with a connecting ring that is linked to the positioning step. The pressure ring is also provided with a limiting ring near the end of the sealing spring. One end of the sealing spring abuts against the end face of the spring seat, and the other end abuts against the end face of the pressure ring.

2. The sealing structure for the reducer shaft according to claim 1, characterized in that: A sealing ring is provided at the connection between the cover and the box body. A gasket is provided between the stationary ring and the end cover. The opening of the sealing cavity is covered with a cover. The cover is hinged to the end cover. The cover is also provided with a venting cavity. The end cover has a first vent hole through the sealing cavity. The cover has a second vent hole connected to the exhaust cavity. Vent caps are inserted into the first vent hole and the second vent hole.

3. The sealing structure for the reducer shaft according to claim 2, characterized in that: The output shaft is provided with a first positioning boss and a second positioning boss. A first roller bearing is provided between the first positioning boss and the through cover. A transmission gear and a second roller bearing are provided between the second positioning boss and the end cover. The output shaft is provided with a fixing key. The transmission gear is engaged with the fixing key to achieve linkage with the output shaft. The transmission gear meshes with the gear shaft.

4. The sealing structure for the reducer shaft according to claim 3, characterized in that: The housing is equipped with a square-headed tube plug, and the gear shaft is equipped with a third roller bearing and a fourth roller bearing at both ends. A reduction gear that is linked to the input shaft is engaged on the gear shaft, and a spacer ring for positioning the reduction gear is also provided on the gear shaft.

5. The sealing structure for the reducer shaft according to any one of claims 1 to 4, characterized in that: The input shaft is provided with a fixed cover, a fifth roller bearing and a sixth roller bearing, a first mounting step and a second mounting step, a fixed ring on the fixed cover, one end of the fifth roller bearing abuts against the end of the fixed ring and the other end abuts against the end face of the first mounting step, one end of the sixth roller bearing abuts against the housing and the other end abuts against the end face of the second mounting step.

6. The sealing structure for the reducer shaft according to claim 5, characterized in that: The input shaft is tapered at one end near the fifth roller bearing. A key block is provided on the end face of the input shaft near the fifth roller bearing, and a keyway is provided at the other end.

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