A seal structure for a wing-type universal joint assembly

Abstract

This invention relates to the field of universal joint technology and discloses an airfoil universal joint assembly with a sealing structure, including a cross shaft, a journal, a sleeve, an oil inlet, and an oil passage. The journal is disposed on the outer periphery of the cross shaft, and a compression assembly is disposed on the outer side of the journal. An oil seal is disposed on the outer periphery of the compression assembly. A pressure assembly is disposed in the middle of the oil passage. An observation assembly and a sampling assembly are disposed in the middle of the sleeve. A needle roller is disposed in the middle of the sleeve, and the needle roller contacts the end of the cross shaft. The compression assembly includes a retaining ring, which is fixedly connected to the outer side of the journal. A compression rod is slidably connected to the middle of the retaining ring, and a first compression spring is sleeved on the outer periphery of the compression rod. Through the active compensation action of the compression assembly, the sealing failure problem caused by the oil seal softening or wearing due to heat during long-term operation is solved, ensuring the long-term sealing performance of the universal joint under harsh conditions.

Description

Technical Field

[0001] This invention relates to the field of universal joint technology, specifically to an airfoil universal joint assembly with a sealed structure. Background Technology

[0002] Airfoil universal joints, as a key transmission component, are widely used in various mechanical equipment to connect two shafts with included angles or relative motion to transmit torque. To ensure the smooth transmission and service life of the universal joint, its internal bearings must be adequately and persistently lubricated, and the sealing structure must effectively prevent lubricant leakage and the intrusion of external contaminants such as dust and moisture.

[0003] However, existing airfoil universal joint assemblies still have shortcomings in terms of sealing and lubrication. Traditional universal joints mostly use passive oil seals for sealing. When the universal joint operates at high speed for a long time, the oil seal material will soften, age, or wear due to the heat generated by friction, which will reduce its sealing performance and make it unable to compensate for the gaps caused by deformation or wear. Ultimately, this will lead to lubricating oil leakage and the intrusion of external contaminants, reducing the reliability of the seal.

[0004] Secondly, when lubricating multiple journal sleeves of the universal joint, due to the inconsistent resistance of each oil passage, the lubricating oil will preferentially flow to the sleeve with the least resistance. This will cause some sleeves to be over-lubricated, while other sleeves will be under-lubricated, which cannot guarantee the uniformity of lubrication. This will lead to uneven wear of the bearings in the universal joint and shorten the overall service life.

[0005] Furthermore, the existing oil filling process lacks effective means of monitoring the internal pressure of the sleeve, making it impossible for operators to visually determine whether the internal oil level is full, often leading to blind oil filling. This overfilling generates excessively high oil pressure, which reverses and damages the oil seal, causing not only leakage but also compromised sealing. Moreover, even if some equipment has simple indicators, if operators operate too quickly or ignore warnings, the extremely high internal oil pressure can still directly rupture the seals. Existing devices generally lack an overload protection mechanism for automatic drainage at critical critical points.

[0006] Finally, the internal workings of existing universal joints are completely black box during operation. During routine inspections and maintenance, it is inconvenient for staff to directly extract internal lubricating oil samples to assess oil quality (e.g., determine if it is blackened, emulsified, or dried out) without disassembling the universal joint and damaging the overall seal. It is also difficult to visually inspect the internal needle roller bearings for abnormal wear (e.g., the production of metal shavings). This lack of monitoring methods forces maintenance to rely solely on periodic oil changes or reactive repairs, increasing maintenance costs and the risk of sudden equipment downtime, failing to meet the practical needs of modern machinery for preventative maintenance. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides an airfoil universal joint assembly with a sealing structure, which solves the problems of existing universal joint oil seals easily failing due to heat-induced softening and wear, poor lubrication due to uneven oil injection from multiple channels, and damage to the seals due to excessive oil pressure caused by the inability to monitor pressure during the oil injection process.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a sealed airfoil universal joint assembly, comprising a cross shaft, a journal, a sleeve, an oil inlet, and an oil passage. The journal is disposed on the outer periphery of the cross shaft, a compression assembly is disposed on the outer side of the journal, an oil seal is disposed on the outer periphery of the compression assembly, a pressure assembly is disposed in the middle of the oil passage, an observation assembly and a sampling assembly are disposed in the middle of the sleeve, and a needle roller is disposed in the middle of the sleeve, the needle roller contacting the end of the cross shaft. The extrusion assembly includes a retaining ring, which is fixedly connected to the outside of the journal. An extrusion rod is slidably connected to the middle of the retaining ring. A first compression spring is sleeved on the outer periphery of the extrusion rod. A blocking block is fixedly connected to the outer periphery of the extrusion rod. An extrusion block is fixedly connected to the end of the extrusion rod away from the first compression spring.

[0009] Preferably, the pressure assembly includes a retaining plate and a retaining ring. Both the retaining ring and the retaining plate are fixedly connected inside the cross shaft. Both the retaining ring and the retaining plate are located in the middle of the oil passage. A connecting rod is slidably connected to the middle of the retaining plate. A round block is fixedly connected to one end of the connecting rod, and a connecting block is fixedly connected to the other end of the connecting rod. A sealing ball is fixedly connected to the side of the connecting block away from the connecting rod. A second compression spring is sleeved on the outer periphery of the connecting rod. A through hole is opened in the middle of the retaining ring, and the sealing ball is slidably connected to the middle of the through hole.

[0010] Preferably, the observation assembly includes an end cap and a pressure relief assembly. The end cap is fixedly connected to the middle of the sleeve. A ring is fixedly connected to the middle of the end cap. An oil passage hole is opened in the middle of the ring. A slide rod is slidably connected to the middle of the end cap. A piston is fixedly connected to one end of the slide rod near the ring. A third compression spring is sleeved on the outer periphery of the slide rod. The pressure relief assembly is disposed on the inner wall of the end cap.

[0011] Preferably, the pressure relief assembly includes a pressure relief groove, which is formed on the inner wall of the end cap, and a vent hole is formed on the side of the end cap away from the annulus.

[0012] Preferably, the sampling assembly includes a sampling rod, which is threadedly connected to the middle of the slide rod. A sampling groove is provided in the middle of the sampling rod. A rubber sleeve is fixedly connected to one end of the sampling rod, and a magnetic block is fixedly connected to the other end of the sampling rod. A sealing gasket is provided in the middle of the slide rod.

[0013] Preferably, a first convex ring is fixedly connected to the outer periphery of the end of the cross shaft, a second convex ring is fixedly connected to the inner wall of the sleeve, a second slot is opened on the inner side of the oil seal, a first slot is fixedly connected to the outer side of the oil seal, the first convex ring is engaged with the second slot, and the second convex ring is engaged with the first slot.

[0014] Preferably, the oil seal has a groove in the middle, and the compression block and the retaining ring are slidably connected in the middle of the groove.

[0015] Preferably, the piston is disposed between the ring and the slide rod, and the diameter of the piston is larger than the diameter of the oil passage.

[0016] Preferably, the end cap and the ring are flush with the inner wall of the sleeve.

[0017] Preferably, the diameter of the sealing ball is larger than the outer diameter of the through hole.

[0018] This invention provides a sealed airfoil universal joint assembly. It offers the following advantages: 1. This invention solves the problem of sealing failure caused by the softening or wear of oil seals due to heat generation during long-term operation by actively compensating for the compression component, thus ensuring the long-term sealing performance of the universal joint under harsh conditions.

[0019] 2. This invention achieves simultaneous and uniform oil injection into different sleeves by using pressure components with the same elasticity installed in each oil passage, thus avoiding abnormal wear caused by insufficient or excessive local lubrication.

[0020] 3. This invention provides a direct visual indication of the oil pressure inside the sleeve through the observation component, allowing operators to stop oiling in a timely manner. Furthermore, in conjunction with the pressure relief component on the inner wall, it automatically discharges oil and relieves pressure when blind oiling causes the pressure to reach a dangerous critical value, providing dual protection against rupture through visual warning and automatic drainage for the oil seal. Simultaneously, the sampling component cleverly integrated inside the slide bar allows operators to independently extract internal lubricating oil samples and absorb and detect metal shavings at any time without disassembling the universal joint or damaging the overall seal. This enables direct monitoring and preventative maintenance of the universal joint's internal oil quality deterioration and bearing wear, significantly improving the equipment's service life and maintenance efficiency. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the cross shaft structure of the present invention; Figure 3 This is a schematic diagram of the clasp position according to the present invention; Figure 4This is a schematic diagram of the cross-sectional structure of the retaining ring of the present invention; Figure 5 This is a schematic diagram of the extrusion assembly structure of the present invention; Figure 6 This is a schematic diagram of the oil seal structure of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the sleeve of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 9 This is a schematic diagram of the pressure component structure of the present invention; Figure 10 This is a schematic diagram of the observation component structure of the present invention; Figure 11 This is a schematic diagram of the cross-sectional structure of the slide bar of the present invention.

[0022] The components are as follows: 1. Cross shaft; 2. Journal; 3. Sleeve; 4. End cap; 5. Slide rod; 6. Oil inlet; 7. Oil passage; 8. Through hole; 9. Oil seal; 10. First convex ring; 11. Extrusion block; 12. Snap ring; 13. Extrusion rod; 14. First compression spring; 15. Block; 16. First slot; 17. Second slot; 18. Groove; 19. Support ring; 20. Clamping plate; 21. Second compression spring; 22. Round block; 23. Sealing ball; 24. Connecting block; 25. Needle roller; 26. Second convex ring; 27. Round ring; 28. Third compression spring; 29. ​​Piston; 30. Oil passage hole; 31. Connecting rod; 32. Pressure relief groove; 33. Vent hole; 34. Sampling rod; 35. Sampling groove; 36. Rubber sleeve; 37. Magnetic block; 38. Sealing gasket. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see the appendix Figure 1 -Appendix Figure 5 This invention provides a sealing structure airfoil universal joint assembly, including a cross shaft 1, a journal 2, a sleeve 3, an oil inlet 6, and an oil passage 7. The journal 2 is disposed on the outer periphery of the cross shaft 1, and a compression assembly is disposed on the outer side of the journal 2. An oil seal 9 is disposed on the outer periphery of the compression assembly. A pressure assembly is disposed in the middle of the oil passage 7. An observation assembly and a sampling assembly are disposed in the middle of the sleeve 3. A needle roller 25 is disposed in the middle of the sleeve 3, and the needle roller 25 contacts the end of the cross shaft 1. In one specific embodiment, the compression assembly applies a continuous thrust to the oil seal 9 through its internal components. This thrust causes one side of the oil seal 9 to press against the end of the cross shaft 1 and the other side to press against the inner wall of the sleeve 3, thereby forming and maintaining a reliable seal between the end of the cross shaft 1 and the inner wall of the sleeve 3, and providing a continuous sealing compensation force when the oil seal 9 softens due to heat from prolonged operation. The pressure assembly constitutes a pressure threshold opening valve. When the oil pressure from the oil inlet 6 is greater than the preset elastic force, the pressure assembly opens, allowing oil to flow into the sleeve 3. The cross shaft 1 has multiple oil passages 7 that lead to different sleeves 3 respectively. Each oil passage 7 is equipped with a pressure assembly, and all preset elastic forces have the same preset elastic force value, thereby achieving simultaneous and uniform distribution of oil to different sleeves 3.

[0025] The observation component is used to respond to the oil pressure inside the sleeve 3. When the oil pressure inside the sleeve 3 exceeds a preset pressure value, the oil pushes the observation component to move, causing the end of the component to extend out of the end cap 4 of the sleeve 3, thereby providing an external operator with a visual indication of excessive internal oil pressure.

[0026] See appendix Figure 1 -Appendix Figure 5 The extrusion assembly includes a retaining ring 12, which is fixedly connected to the outside of the journal 2. An extrusion rod 13 is slidably connected to the middle of the retaining ring 12. A first compression spring 14 is sleeved on the outer periphery of the extrusion rod 13. A blocking block 15 is fixedly connected to the outer periphery of the extrusion rod 13. An extrusion block 11 is fixedly connected to the end of the extrusion rod 13 away from the first compression spring 14.

[0027] In one specific embodiment, during installation, the compression block 11 is first squeezed, and the elastic oil seal 9 is fitted onto the outside of the compression block 11 on the retaining ring 12. The first compression spring 14 pushes the blocking block 15, and the blocking block 15 drives the compression rod 13 to push its corresponding compression block 11, so that one side of the oil seal 9 is in contact with the end of the cross shaft 1. Another set of first compression springs 14 pushes its corresponding blocking block 15, compression rod 13 and compression block 11, so that the other side of the oil seal 9 is in contact with the inner wall of the sleeve 3, thereby forming and maintaining a reliable seal between the end of the cross shaft 1 and the inner wall of the sleeve 3, and providing continuous sealing compensation force when the oil seal 9 softens due to heat from long-term operation, ensuring the sealing effect.

[0028] See appendix Figure 8 and attached Figure 9The pressure assembly includes a retaining plate 20 and a retaining ring 19. Both the retaining ring 19 and the retaining plate 20 are fixedly connected inside the cross shaft 1. Both the retaining ring 19 and the retaining plate 20 are located in the middle of the oil passage 7. A connecting rod 31 is slidably connected to the middle of the retaining plate 20. A round block 22 is fixedly connected to one end of the connecting rod 31, and a connecting block 24 is fixedly connected to the other end of the connecting rod 31. A sealing ball 23 is fixedly connected to the side of the connecting block 24 away from the connecting rod 31. A second compression spring 21 is sleeved on the outer periphery of the connecting rod 31. A through hole 8 is opened in the middle of the retaining ring 19, and the sealing ball 23 is slidably connected in the middle of the through hole 8.

[0029] In one specific embodiment, the sealing ball 23, under the elastic force of the second compression spring 21, abuts against the support ring 19 and blocks the through hole 8. When continuous oil injection causes the oil pressure in the oil passage 7 to exceed the preset elastic force of the second compression spring 21, the oil pushes the sealing ball 23, the sealing ball 23 squeezes the connecting block 24, and drives the connecting rod 31 to slide in the middle of the clamping plate 20, so that the sealing ball 23 leaves the through hole 8, allowing the oil to pass through. The cross shaft 1 has multiple oil passages 7 leading to different sleeves 3. Each oil passage 7 is equipped with a pressure component, and all the second compression springs 21 have the same preset elastic force value, thereby improving the uniformity of oil entering the sleeve 3. After the oil injection stops, the second compression spring 21 will push the connecting block 24, so that the sealing ball 23 can block the through hole 8, ensuring that the oil in the universal joint will not flow back during use, and ensuring that the oil in the sleeve 3 can be lubricated by the needle rollers 25.

[0030] See appendix Figure 1 Appendix Figure 7 and attached Figure 10 The observation assembly includes an end cap 4 and a pressure relief assembly. The end cap 4 is fixedly connected to the middle of the sleeve 3. A ring 27 is fixedly connected to the middle of the end cap 4. An oil passage hole 30 is opened in the middle of the ring 27. A slide rod 5 is slidably connected to the middle of the end cap 4. A piston 29 is fixedly connected to the end of the slide rod 5 near the ring 27. A third compression spring 28 is sleeved on the outer periphery of the slide rod 5. The pressure relief assembly is located on the inner wall of the end cap 4. The pressure relief assembly includes a pressure relief groove 32. The pressure relief groove 32 is opened in the inner wall of the end cap 4. A vent hole 33 is opened on the side of the end cap 4 away from the ring 27.

[0031] In one specific embodiment, the third compression spring 28 keeps the slide rod 5 and piston 29 in their initial positions. When the oil pressure in the sleeve 3 exceeds a preset value, the oil pushes the piston 29 through the oil passage 30. The piston 29 compresses the third compression spring 28 and drives the slide rod 5 to slide, so that the end of the slide rod 5 protrudes from the end cover 4 as a pressure indicator, so that the staff can observe it when injecting oil. When the slide rod 5 protrudes, the oil injection stops to avoid blindly injecting oil and causing the oil pressure to squeeze the oil seal 9 to leak out. During normal oil injection and in the early stage of normal pressure exceeding the standard, the slide rod 5 protrudes outward as a visual warning. At this time, the pressure relief groove 32 is still hidden in the inner wall of the end cover 4 to maintain a seal. If the worker continues to blindly apply oil, the pressure will reach a dangerous critical value. The piston 29 will be pushed beyond the pressure relief groove 32, and the excess lubricating oil will spray outward from the vent hole 33 along the pressure relief groove 32 to release pressure. Once the pressure drops, the third pressure spring 28 will pull the slide rod 5 back, cutting off the leakage.

[0032] See appendix Figure 10 and attached Figure 11 The sampling assembly includes a sampling rod 34, which is threaded to the middle of the slide bar 5. A sampling groove 35 is provided in the middle of the sampling rod 34. A rubber sleeve 36 is fixedly connected to one end of the sampling rod 34, and a magnetic block 37 is fixedly connected to the other end of the sampling rod 34. A sealing gasket 38 is provided in the middle of the slide bar 5.

[0033] In one specific embodiment, during pressure testing, due to the overall linkage of the structure, when the pressure inside the sleeve 3 is too high, the oil pushes the piston 29. The piston 29, along with the slide rod 5 and the internally tightened sampling rod 34, extends outward as a whole, performing the original pressure overload alarm function. During quality testing, independent extraction can be achieved. When staff want to check the oil quality, there is no need to disassemble the universal joint; they only need to press the rubber sleeve 36 to expel the air from the sampling groove 35. When the rubber sleeve 36 resets, the oil will be drawn into the sampling groove 35 under negative pressure. Then, by externally unscrewing the sampling rod 34, it can be extracted separately from the slide rod 5. At this time, it can be visually or tactilely inspected: observe the lubricating oil sample brought out of the sampling groove 35 to see if it is blackened, emulsified, or dried out, to determine whether replacement is necessary. Wear and metal filings detection can also be performed: observe whether a large amount of metal powder is adsorbed on the end magnetic block 37. If metal filings are adsorbed, it directly proves that the lubricating oil has failed, causing abnormal wear of the bearing. After the test is completed, reset the device by inserting the sampling rod 34 back into the slide rod 5 and tightening it. With the cooperation of the sealing gasket 38, the universal joint instantly returns to a sealed state.

[0034] See appendix Figure 3 Appendix Figure 6 and attached Figure 7 A first protruding ring 10 is fixedly connected to the outer periphery of the end of the cross shaft 1, a second protruding ring 26 is fixedly connected to the inner wall of the sleeve 3, a second slot 17 is opened on the inner side of the oil seal 9, a first slot 16 is fixedly connected to the outer side of the oil seal 9, the first protruding ring 10 is engaged with the second slot 17, and the second protruding ring 26 is engaged with the first slot 16.

[0035] In one specific embodiment, during installation, the first protruding ring 10 engages with the second slot 17, while the second protruding ring 26 engages with the first slot 16. Through the combination of engagement and the thrust applied by the compression assembly, the oil seal 9 is simultaneously and tightly pressed against the end of the cross shaft 1 and the inner wall of the sleeve 3, further improving sealing and fixation.

[0036] See appendix Figure 6 The oil seal 9 has a groove 18 in the middle, and the compression block 11 and the retaining ring 12 are slidably connected in the middle of the groove 18.

[0037] In one specific embodiment, the squeezing block 11 applies a pushing force to the inner wall of the groove 18 under the elastic force of the first compression spring 14. Multiple sets of squeezing blocks 11 arranged on the inner and outer sides of the retaining ring 12 act simultaneously, pushing the sealing parts of the oil seal 9 located on both sides of the groove 18 toward and pressing the end of the cross shaft 1 and the inner wall of the sleeve 3.

[0038] See appendix Figure 10 The piston 29 is positioned between the ring 27 and the slide rod 5, and the diameter of the piston 29 is larger than the diameter of the oil passage 30.

[0039] In one specific embodiment, piston 29 is fixedly connected to one end of slide rod 5 near ring 27. The diameter of piston 29 is larger than the diameter of oil passage hole 30 on ring 27, ensuring that the oil flowing out of oil passage hole 30 can completely act on the pressure bearing surface of piston 29 to form an effective thrust for driving piston 29 and slide rod 5 to move.

[0040] The end cap 4 and the ring 27 are flush with the inner wall of the sleeve 3.

[0041] In one specific embodiment, the end cap 4 is used to close the end of the sleeve 3, and the ring 27 is disposed inside the end cap 4. Together, they define the chamber in which the piston 29 moves and ensure the sliding coaxiality of the slide rod 5. At the same time, they can prevent the ring 27 from being damaged by friction with the end of the cross shaft 1.

[0042] See appendix Figure 9 The diameter of the sealing ball 23 is larger than the outer diameter of the through hole 8.

[0043] In one specific embodiment, the diameter of the sealing ball 23 is larger than the outer diameter of the through hole 8. This ensures that the sealing ball 23, under the push of the second compression spring 21, can reliably abut against the support ring 19 and completely cover the through hole 8, thereby blocking and sealing the oil passage 7 when the oil pressure is lower than a preset value.

[0044] Working principle: First, during installation, the elastic oil seal 9 is fitted onto the outside of the compression block 11 on the retaining ring 12. Under the action of a set of first compression springs 14, the first compression springs 14 push a set of blocking blocks 15. The blocking blocks 15 drive a set of compression rods 13 to push the compression block 11, thereby tightly fitting one side of the oil seal 9 against the end of the cross shaft 1, and the first convex ring 10 engages with the second retaining groove 17. At the same time, the other side of the oil seal 9 is compressed, and the sleeve 3 is inserted into the end of the cross shaft 1. Under the action of another set of first compression springs 14, This causes the first compression spring 14 to push a set of blocking blocks 15, which in turn drives a set of pressing rods 13 to push a set of pressing blocks 11. This causes the other side of the oil seal 9 to be tightly pressed against the inner wall of the sleeve 3. The second convex ring 26 on the inner wall of the sleeve 3 will engage with the first retaining groove 16. As a result, under the action of the pressing blocks 11 on both sides of the retaining ring 12 pressing the oil seal 9, when the universal joint heats up and softens due to long-term use, the contact position between the oil seal 9 and the end of the cross shaft 1 and the sleeve 3 can be more tightly fitted, ensuring a sealing effect.

[0045] When the universal joint is filled with oil through the oil inlet 6, the oil will accumulate in the oil passage 7 inside the cross shaft 1. The sealing ball 23 will block the oil. When the thrust generated by the oil is greater than the preset elastic force of the second compression spring 21, the oil will push the sealing ball 23. The sealing ball 23 will squeeze the connecting block 24, causing the connecting block 24 to drive the connecting rod 31 to slide in the middle of the clamping plate 20. Since the second compression spring 21 in each oil passage has the same preset elastic force, it is ensured that the oil can enter the different sleeves 3 evenly and simultaneously.

[0046] Furthermore, when the oil pressure inside the sleeve 3 is too high, the oil will flow in through the oil passage 30 in the ring 27, thereby pushing the piston 29. This causes the piston 29 to drive the slide rod 5 to extend from the end of the end cover 4, allowing the operator to judge the oil pressure inside the sleeve 3 by observing the slide rod 5. This prevents excessive oil pressure from causing excessive pressure on the oil seal 9 and resulting in leakage. If overfilling occurs and the pressure reaches a dangerous critical value, the piston 29 will continue to move outward past the pressure relief groove 32. Excess lubricating oil will be automatically discharged through the pressure relief groove 32 and the vent hole 33 to relieve pressure and prevent the oil seal from rupturing. In addition, during routine maintenance and inspection, the operator only needs to press the outer rubber sleeve 36 and unscrew the sampling rod 34 to pull it out separately. By sampling the lubricating oil sample taken from the sampling groove 35 and checking whether iron filings are adsorbed on the magnetic block 37, the operator can visually inspect the oil quality and the internal wear condition of the bearing. After the inspection is completed, resetting the sleeve will restore the seal.

Claims

1. A sealing structure for an airfoil universal joint assembly, comprising a cross shaft (1), a journal (2), a sleeve (3), an oil inlet (6), and an oil passage (7), characterized in that, The journal (2) is disposed on the outer periphery of the cross shaft (1), and an extrusion assembly is disposed on the outer side of the journal (2). An oil seal (9) is disposed on the outer periphery of the extrusion assembly. A pressure assembly is disposed in the middle of the oil passage (7). An observation assembly and a sampling assembly are disposed in the middle of the sleeve (3). A needle roller (25) is disposed in the middle of the sleeve (3). The needle roller (25) is in contact with the end of the cross shaft (1). The extrusion assembly includes a retaining ring (12), which is fixedly connected to the outside of the journal (2). An extrusion rod (13) is slidably connected to the middle of the retaining ring (12). A first compression spring (14) is sleeved on the outer periphery of the extrusion rod (13). A stop block (15) is fixedly connected to the outer periphery of the extrusion rod (13). An extrusion block (11) is fixedly connected to the end of the extrusion rod (13) away from the first compression spring (14).

2. The airfoil universal joint assembly with a sealing structure according to claim 1, characterized in that, The pressure assembly includes a retaining plate (20) and a retaining ring (19). The retaining ring (19) and the retaining plate (20) are both fixedly connected inside the cross shaft (1). The retaining ring (19) and the retaining plate (20) are both located in the middle of the oil passage (7). A connecting rod (31) is slidably connected to the middle of the retaining plate (20). A round block (22) is fixedly connected to one end of the connecting rod (31). A connecting block (24) is fixedly connected to the other end of the connecting rod (31). A sealing ball (23) is fixedly connected to the side of the connecting block (24) away from the connecting rod (31). A second compression spring (21) is sleeved on the outer periphery of the connecting rod (31). A through hole (8) is opened in the middle of the retaining ring (19). The sealing ball (23) is slidably connected to the middle of the through hole (8).

3. The airfoil universal joint assembly with a sealing structure according to claim 1, characterized in that, The observation assembly includes an end cap (4) and a pressure relief assembly. The end cap (4) is fixedly connected to the middle of the sleeve (3). A ring (27) is fixedly connected to the middle of the end cap (4). An oil passage (30) is opened in the middle of the ring (27). A slide rod (5) is slidably connected to the middle of the end cap (4). A piston (29) is fixedly connected to one end of the slide rod (5) near the ring (27). A third compression spring (28) is sleeved on the outer periphery of the slide rod (5). The pressure relief assembly is disposed on the inner wall of the end cap (4).

4. The airfoil universal joint assembly with a sealing structure according to claim 3, characterized in that, The pressure relief assembly includes a pressure relief groove (32), which is formed on the inner wall of the end cap (4), and a vent hole (33) is formed on the side of the end cap (4) away from the annulus (27).

5. The airfoil universal joint assembly with a sealing structure according to claim 3, characterized in that, The sampling assembly includes a sampling rod (34), which is threaded to the middle of the slide bar (5). A sampling groove (35) is provided in the middle of the sampling rod (34). A rubber sleeve (36) is fixedly connected to one end of the sampling rod (34), and a magnetic block (37) is fixedly connected to the other end of the sampling rod (34). A sealing gasket (38) is provided in the middle of the slide bar (5).

6. The airfoil universal joint assembly with a sealing structure according to claim 1, characterized in that, The outer periphery of the end of the cross shaft (1) is fixedly connected to a first protruding ring (10), the inner wall of the sleeve (3) is fixedly connected to a second protruding ring (26), the inner side of the oil seal (9) is provided with a second slot (17), the outer side of the oil seal (9) is fixedly connected to a first slot (16), the first protruding ring (10) is engaged with the second slot (17), and the second protruding ring (26) is engaged with the first slot (16).

7. The airfoil universal joint assembly with a sealing structure according to claim 1, characterized in that, The oil seal (9) has a groove (18) in the middle, and the compression block (11) and the retaining ring (12) are slidably connected in the middle of the groove (18).

8. The airfoil universal joint assembly with a sealing structure according to claim 3, characterized in that, The piston (29) is disposed between the ring (27) and the slide rod (5), and the diameter of the piston (29) is larger than the diameter of the oil passage (30).

9. The airfoil universal joint assembly with a sealing structure according to claim 3, characterized in that, The end cap (4) and the ring (27) are flush with the inner wall of the sleeve (3).

10. The airfoil universal joint assembly with a sealing structure according to claim 2, characterized in that, The diameter of the sealing ball (23) is larger than the outer diameter of the through hole (8).

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