Single-lip polytetrafluoroethylene oil seal structure

Abstract

The utility model relates to the technical field of oil seals, and particularly discloses a single-lip teflon oil seal structure which comprises a first ring body, a first extension part which is bent and extends from the first ring body, a second extension part, a first elastic piece which is clamped by the first extension part and the second extension part, and a second elastic piece which is used for applying an abutting force to an internal component through a third extension part, the sealing effect of the oil seal on a shaft is remarkably enhanced, even under the condition that the shaft is eccentric or jumps, the oil seal can be tightly attached to the shaft through dynamic adjustment, and therefore the stable sealing performance is maintained, the adaptability and durability of the oil seal are improved through the innovative design, and the service life of the oil seal is prolonged. And efficient and reliable sealing can be realized under various working conditions, and the service life of the oil seal is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, and particularly discloses a single-lip tetrafluoroethylene oil seal structure. Background Art

[0002] Traditional oil seals can be widely used in various mechanical equipment, including but not limited to the fields of automobiles, industrial machinery, aerospace, etc. However, the sealing performance of traditional oil seals is not ideal. For example, under high pressure, high speed or extreme working conditions, leakage is likely to occur. As the use time increases, the sealing pre-tightening specific pressure of traditional oil seals on the rotating shaft will gradually decrease, resulting in a decline in the sealing effect. Summary of the Utility Model

[0003] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the utility model is to provide a single-lip tetrafluoroethylene oil seal structure.

[0004] To achieve the above purpose, a single-lip tetrafluoroethylene oil seal structure of the utility model includes a first ring body, a first extension part and a second extension part that are bent and extended from the first ring body. The first extension part and the second extension part are used to clamp a first elastic member. One end of the first ring body away from the first extension part is provided with a third extension part, and the third extension part is used to limit a second elastic member. The third extension part is used to abut against an internal component accommodated inside the oil seal through the second elastic member. The first elastic member is clamped by the first extension part and the second extension part, while the second elastic member applies an abutting force to the internal component accommodated inside the oil seal through the third extension part. This design enhances the sealing effect of the oil seal on the shaft. Even when there is eccentricity or runout in the rotating shaft, stable sealing performance can be maintained.

[0005] Furthermore, by clamping the first elastic member with the first extension part and the second extension part, and limiting the second elastic member with the third extension part, the oil seal can be better supported and adjusted axially and radially, forming a more stable sealing environment between the oil seal and the rotating shaft, effectively reducing the sealing failure problems caused by axial runout or radial eccentricity. During the working process, the combined use of the double elastic members can endow the oil seal with a certain dynamic adjustment ability. When there are slight offsets or vibrations in the rotating shaft, the elasticity of the elastic members can absorb these changes and maintain a tight fit between the oil seal and the shaft through their own deformation, thereby maintaining the stability of the sealing effect. The existence of the elastic members also provides a certain buffer protection for the oil seal. During the rotation of the rotating shaft, the elastic members can absorb part of the impact and vibration energy, reducing the direct impact and wear on the oil seal material, thereby prolonging the service life of the oil seal.

[0006] Further, a second ring body is provided on the third extension portion. An included angle is formed between the second ring body and the third extension portion, and the included angle is 90° - 180°. A second elastic member is provided at the free end of the second ring body. Through the combination of the third extension portion and the second ring body, the contact area between the oil seal and the internal component is increased, which can more effectively prevent the leakage of fluid or gas from the sealing interface and improve the overall sealing performance. The design of the 90° - 180° included angle enables the second ring body to have better elasticity to better adapt to the shape and position of the internal component. This flexibility helps to maintain a tight fit between the oil seal and the internal component, thereby improving the sealing effect.

[0007] Further, the first extension portion and the second extension portion are used to clamp or support the elastic member inside the oil seal. The first extension portion and the second extension portion provide a stable installation platform for the elastic member, ensuring that the first elastic member can be correctly positioned and fixed. When the first elastic member is clamped between the extension portions, the first elastic member will apply a pre-tightening force to the sealing lip of the oil seal, which helps to keep the sealing lip in close contact, thereby ensuring the sealing performance of the oil seal. The first extension portion and the second extension portion enhance the overall structural stability of the oil seal. The first extension portion and the second extension portion provide additional rigidity and support to the oil seal, helping to resist external vibration and impact and preventing the oil seal from deforming or being damaged under harsh working conditions.

[0008] Further, a bent portion is also provided at the free end of the second ring body. The bent portion extends from the free end of the second ring body by bending. The bent portion cooperates with the second ring body to install / limit the second elastic member. The design of the bent portion provides an accurate limiting point for the second elastic member, ensuring that the elastic member can maintain the correct position and posture after installation. This helps to prevent the elastic member from shifting or falling off during the working process, thereby maintaining the stability and sealing performance of the oil seal. The coordinated action of the bent portion and the second ring body provides a more stable support for the second elastic member. This stable support structure can reduce the vibration and shaking of the elastic member during the working process, ensuring that the oil seal can work continuously and stably.

[0009] Further, the diameter of the second ring body gradually decreases from the third extension portion to the bent portion. The first through hole and the second through hole are provided on the second ring body. The diameter of the first through hole gradually decreases from the third extension portion to the bent portion direction, and the diameter of the second through hole gradually increases from the third extension portion to the bent portion direction. The fact that the diameter of the second ring body gradually decreases from the third extension portion to the bent portion forms a natural strengthening structure near the bent portion of the second ring body. The gradual decrease in the diameter of the second ring body helps to concentrate the stress during the working process of the oil seal. Due to the gradual change in diameter, the stress can be more concentrated, so that a stress peak appears at the included angle formed between the first through hole and the second through hole, increasing the sealing effect of the oil seal. The first through hole with a gradually decreasing diameter may help to form a tighter sealing interface and reduce the leakage of fluid or gas.

[0010] Furthermore, the extension length of the first extension part is not less than that of the second extension part. Since the first extension part has a longer extension length, it can clamp the first elastic part more tightly, thereby providing stronger clamping force and stability. This enhanced clamping force helps to maintain a tight fit between the oil seal and the rotating shaft, reducing the possibility of leakage. During the operation of the oil seal, various forces and torques will be generated between the rotating shaft and the oil seal. By designing extension parts with different lengths, these forces and torques can be dispersed to different positions, reducing the phenomenon of local stress concentration, thereby improving the structural strength and stability of the oil seal.

[0011] Furthermore, a chamfer is provided at the end of the third extension part. The chamfer is used to reduce the edge stress of the third extension part. The chamfer design can effectively disperse the stress that might originally concentrate at the edge of the third extension part to a larger area. This stress dispersion effect helps to reduce the stress peak at the edge, thereby reducing the risk of fatigue failure and crack propagation caused by stress concentration. The chamfer design can make the contact between the end of the third extension part and adjacent components (such as the rotating shaft or the sealing groove) smoother and tighter. This smooth contact helps to reduce the formation of leakage channels, thereby improving the sealing performance of the oil seal.

[0012] Furthermore, arc segments are provided at one ends of the first extension part and the second extension part close to the first ring body. The arc design enables the first extension part and the second extension part to fit more tightly to the contour of the first elastic part. This tight fit helps to increase the clamping force, ensuring that the elastic part maintains a stable position and attitude during the operation of the oil seal. The arc design also enables the clamping force to be more evenly distributed on the first elastic part, reducing the phenomenon of local stress concentration, which helps to extend the service life of the first elastic part and the oil seal.

[0013] Furthermore, the second elastic part 8 is an oil seal elastic part with an inner diameter of 1.5mm * 49mm * 0.25 mm (wire diameter * inner diameter * wire thickness), and the material of the first elastic part 7 is an O-shaped elastic part with an inner diameter of 5mm * 0.15mm * 2 * 253mm.

[0014] Furthermore, a cut angle is provided on the bending part. The cut angle design provides a smooth entry path for the second elastic part, reducing the resistance and friction during the installation process. Through the cut angle, it can be ensured that the second elastic part can be accurately positioned to the predetermined position during the installation process. When the second elastic part needs to be disassembled or replaced, the cut angle design also provides convenience. It can reduce the resistance and difficulty during the disassembly process, making the maintenance work easier and more efficient.

[0015] Furthermore, the first ring body, the first extension part, the second extension part, the third extension part, the second ring body and the bending part are integrally injection-molded. During the injection molding process, the material will evenly fill every corner of the mold, making each part of the oil seal more balanced in structure. This helps ensure that the oil seal can be evenly stressed during operation, reducing damage caused by local stress concentration. The integral injection molding process can precisely control the size and shape of the oil seal to ensure its fitting accuracy with the rotating shaft. This high-precision fitting helps reduce the formation of leakage channels and improve the sealing performance of the oil seal.

[0016] Advantages of the present utility model: Through the first ring body, the first extension part, the second extension part, the third extension part, the second ring body and the bending part, not only the strength and stability of the overall structure are improved, but also the sealing effect is significantly enhanced. The ingenious application of the double elastic members, combined with the tight clamping of the first elastic member by the arc extension part and the limit of the second elastic member by the third extension part, enables the oil seal to dynamically adjust both axially and radially, effectively absorbing the small offsets or vibrations of the shaft and maintaining a tight fit with the shaft. Even in the case of shaft eccentricity or runout, it can stably seal. The combined design of the third extension part and the second ring body increases the sealing contact area, improves the sealing performance and reduces stress concentration by adjusting the included angle and diameter change. The existence of the bending part and the chamfer further optimizes the installation and disassembly process of the elastic members and provides stable support. The overall design not only extends the service life of the oil seal, but also broadens its application range, being applicable to a variety of mechanical equipment, demonstrating excellent versatility and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural view of the body of the present utility model;

[0018] Figure 2 is a schematic cross-sectional structural view of the body of the present utility model;

[0019] Figure 3 is a partial schematic cross-sectional structural view of the body of the present utility model;

[0020] Figure 4 is a schematic top view structural view of the body of the present utility model.

[0021] Reference numerals include:

[0022] 1, first ring body; 2, first extension part; 3, second extension part; 4, third extension part; 5, second ring body;

[0023] 6, bending part; 7, first elastic member; 8, second elastic member; 9, first through hole; 10, second through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] For the convenience of understanding by those skilled in the art, the present utility model will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the embodiments does not limit the present utility model.

[0025] Please refer to Figures 1 to 4 As shown, a single-lip tetrafluoro oil seal structure of the present utility model includes a first ring body 1, a first extension portion 2 and a second extension portion 3 that are bent and extended from the first ring body 1. The first extension portion 2 and the second extension portion 3 are used to clamp a first elastic member 7. A third extension portion 4 is provided at one end of the first ring body 1 away from the first extension portion 2. The third extension portion 4 is used to limit a second elastic member 8. The third extension portion 4, via the second elastic member 8, is used to abut against an internal member accommodated inside the oil seal. The first elastic member 7 is clamped by the first extension portion 2 and the second extension portion 3, and the second elastic member 8 applies an abutting force to the internal member accommodated inside the oil seal through the third extension portion. This design enhances the sealing effect of the oil seal on the shaft. Even when the rotating shaft is eccentric or jumping, a stable sealing performance can be maintained.

[0026] Specifically, by clamping the first elastic member 7 with the first extension portion 2 and the second extension portion 3, and limiting the second elastic member 8 with the third extension portion 4, the oil seal can be better supported and adjusted both axially and radially, forming a more stable sealing environment between the oil seal and the rotating shaft, effectively reducing the sealing failure problems caused by axial jumping or radial eccentricity. During the working process, the combined use of the double elastic members enables the oil seal to have a certain dynamic adjustment ability. The elasticity of the elastic members can absorb these changes and maintain a tight fit between the oil seal and the shaft through their own deformation, thereby maintaining the stability of the sealing effect. The presence of the elastic members also provides a certain buffer protection for the oil seal. During rotation, the elastic members can absorb part of the impact and vibration energy, reducing the direct impact and wear on the oil seal material, thereby extending the service life of the oil seal.

[0027] Specifically, one end of the first extension portion 2 close to the first ring body 1 is provided with a radian, one end of the first extension portion 2 close to the first ring body 1 is C-shaped, and one end of the first extension portion 2 away from the first ring body 1 is provided in a straight line.

[0028] Specifically, the structure of the second extension portion 3 is similar to that of the first extension portion 2.

[0029] Specifically, a second annular body 5 is provided on the third extension portion 4. An included angle is formed between the second annular body 5 and the third extension portion 4, and the included angle is 90°-180°. A second elastic member 8 is provided at the free end of the second annular body 5. Through the combination of the third extension portion 4 and the second annular body 5, the contact area between the oil seal and the internal component is increased, which can more effectively prevent fluids or gases from leaking from the sealing interface, improving the overall sealing performance. The 90°-180° included angle design enables the second annular body 5 to have better elasticity to better adapt to the shape and position of the internal component. This flexibility helps to maintain a tight fit between the oil seal and the internal component, thereby improving the sealing effect.

[0030] Specifically, the first extension portion 2 and the second extension portion 3 are used to clamp or support the elastic member inside the oil seal. The first extension portion 2 and the second extension portion 3 provide a stable installation platform for the elastic member, ensuring that the first elastic member 7 can be correctly positioned and fixed. When the first elastic member 7 is clamped between the extension portions, the first elastic member 7 exerts a pre-tightening force on the sealing lip of the oil seal, helping to keep the sealing lip in close contact, thereby ensuring the sealing performance of the oil seal. The first extension portion 2 and the second extension portion 3 enhance the overall structural stability of the oil seal. The first extension portion 2 and the second extension portion 3 provide additional rigidity and support for the oil seal, helping to resist external vibrations and impacts and preventing the oil seal from deforming or being damaged under harsh working conditions.

[0031] Specifically, a bent portion 6 is further provided at the free end of the second annular body 5. The bent portion 6 extends by bending from the free end of the second annular body 5. The bent portion 6 cooperates with the second annular body 5 to mount / limit the second elastic member 8. The bent portion 6 provides an accurate limiting point for the second elastic member 8, ensuring that the elastic member can maintain the correct position and posture after installation, helping to prevent the elastic member from shifting or falling off during operation, thereby maintaining the stability and sealing performance of the oil seal. The coordinated action of the bent portion 6 and the second annular body 5 provides a more stable support for the second elastic member 8. This stable support structure can reduce the vibration and sway of the elastic member during operation, ensuring that the oil seal can work continuously and stably.

[0032] Specifically, the diameter of the second ring body 5 gradually decreases from the third extension part 4 towards the bending part 6. The first through hole 9 and the second through hole 10 are provided on the second ring body 5. The diameter of the first through hole 9 gradually decreases from the third extension part 4 towards the bending part 6, and the diameter of the second through hole 10 gradually increases from the third extension part 4 towards the bending part 6. The gradually decreasing diameter of the second ring body 5 forms a natural strengthening structure near the bending part 6. The gradually decreasing diameter of the second ring body 5 helps the stress concentration phenomenon during the operation of the oil seal. Due to the gradual change in diameter, the stress can be more concentrated, so that a stress peak appears at the included angle formed between the first through hole 9 and the second through hole 10, increasing the sealing effect of the oil seal. The first through hole 9 with a gradually decreasing diameter may help form a tighter sealing interface and reduce the leakage of fluid or gas.

[0033] Specifically, the extension length of the first extension part 2 is not less than that of the second extension part 3. Since the first extension part 2 has a longer extension length, it can clamp the first elastic part 7 more tightly, thereby providing stronger clamping force and stability. This enhanced clamping force helps to maintain a tight fit between the oil seal and the rotating shaft and reduce the possibility of leakage. During the operation of the oil seal, various forces and torques are generated between the rotating shaft and the oil seal. By designing extension parts with different lengths, these forces and torques can be distributed to different positions, reducing the local stress concentration phenomenon, thereby improving the structural strength and stability of the oil seal.

[0034] Specifically, a chamfer is provided at the end of the third extension part 4. The chamfer is used to reduce the edge stress of the third extension part 4. The chamfer design can effectively disperse the stress that might originally concentrate on the edge of the third extension part 4 to a larger area. This stress dispersion effect helps to reduce the stress peak at the edge, thereby reducing the risk of fatigue failure and crack propagation caused by stress concentration. The chamfer design can make the contact between the end of the third extension part 4 and adjacent components (such as the rotating shaft or the sealing groove) smoother and tighter. This smooth contact helps to reduce the formation of leakage channels, thereby improving the sealing performance of the oil seal.

[0035] Specifically, arc-shaped sections are provided at the ends of the first extension part 2 and the second extension part 3 close to the first ring body 1. The arc-shaped design enables the first extension part 2 and the second extension part 3 to fit more closely to the contour of the first elastic part 7. This close fit helps to increase the clamping force and ensure that the elastic part maintains a stable position and posture during the operation of the oil seal. The arc-shaped design also enables the clamping force to be more evenly distributed on the first elastic part 7, reducing the phenomenon of local stress concentration, which helps to extend the service life of the first elastic part 7 and the oil seal.

[0036] Specifically, the second elastic part 8 is an oil seal elastic part with an inner diameter of 1.5mm * 49mm * 0.25 mm(Wire diameter * Inner diameter * Wire thickness).

[0037] Specifically, the first elastic member 7 is an O-shaped elastic member with an inner diameter of 5 mm * 0.15 mm * 2 * 253 mm.

[0038] Specifically, the first elastic member 7 is an O-shaped spring WO301.

[0039] Specifically, the second elastic member 8 is an oil seal spring PYF301.

[0040] Specifically, a cut angle is provided on the bending portion 6, and the cut angle is located at the free end of the bending portion 6 to facilitate the entry of the elastic member. The cut angle design provides a smooth entry path for the second elastic member 8, reducing the resistance and friction during installation. Through the cut angle, it can be ensured that the second elastic member 8 can be accurately positioned to the predetermined position during installation. When the second elastic member 8 needs to be disassembled or replaced, the cut angle design also provides convenience. It can reduce the resistance and difficulty during disassembly, making the maintenance work easier and more efficient.

[0041] Specifically, the oil seal is a single-lip oil seal made of polytetrafluoroethylene (PTFE). Polytetrafluoroethylene shows excellent resistance to almost all chemical substances, including strong acids, strong bases, strong oxidants, and organic solvents. This means that the single-lip PTFE oil seal can work stably in various harsh chemical environments for a long time and is not easily corroded or dissolved. The friction coefficient of polytetrafluoroethylene is extremely low, only 0.02, which is 1 / 40 of that of rubber. This low friction characteristic enables the single-lip PTFE oil seal to significantly reduce friction loss and heat generation during rotation or sliding, improving the energy efficiency and lifespan of the equipment. The surface of the polytetrafluoroethylene material has outstanding self-lubricity, and almost all viscous substances cannot adhere to its surface. This helps to keep the oil seal clean and maintain its sealing performance, reducing the leakage risk caused by the accumulation of impurities.

[0042] Specifically, the first ring body 1, the first extension portion 2, the second extension portion 3, the third extension portion 4, the second ring body 5, and the bending portion 6 are integrally injection-molded. During the injection molding process, the material will be evenly filled into every corner of the mold, making each part of the oil seal more balanced in structure. This helps to ensure that the oil seal can be evenly stressed during operation, reducing damage caused by local stress concentration. The integral injection molding process can precisely control the size and shape of the oil seal to ensure its matching accuracy with the rotating shaft. This high-precision matching helps to reduce the formation of leakage channels and improve the sealing performance of the oil seal.

[0043] The above content is only the preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A single-lip tetrafluoro oil seal structure, comprising a first ring body (1), a first extension part (2) bent and extended from the first ring body (1), and a second extension part (3); characterized in that: The first extension part (2) and the second extension part (3) are used to clamp the first elastic part (7). One end of the first ring body (1) far from the first extension part (2) is provided with a third extension part (4). The third extension part (4) is used to limit the second elastic part (8), and the third extension part (4) is used to abut against the internal component accommodated inside the oil seal via the second elastic part (8).

2. The single-lip tetrafluoro oil seal structure according to claim 1, characterized in that: A second ring body (5) is arranged on the third extension part (4). An included angle is formed between the second ring body (5) and the third extension part (4), and the included angle is 90° - 180°. A second elastic part (8) is arranged at the free end of the second ring body (5).

3. The single-lip tetrafluoro oil seal structure according to claim 2, wherein; A bending part (6) is further arranged at the free end of the second ring body (5). The bending part (6) is bent and extended from the free end of the second ring body (5). The bending part (6) and the second ring body (5) are used to install / limit the second elastic part (8).

4. A single-lip tetrafluoro oil seal structure according to claim 3, characterized in that: The diameter of the second ring body (5) gradually becomes smaller from the third extension part (4) to the bending part (6). A first through hole (9) and a second through hole (10) are formed in the second ring body (5). The diameter of the first through hole (9) gradually decreases from the third extension part (4) to the direction of the bending part (6), and the diameter of the second through hole (10) gradually increases from the third extension part (4) to the direction of the bending part (6).

5. A single-lip tetrafluoro oil seal structure according to claim 1, characterized in that: The extension length of the first extension part (2) is not less than that of the second extension part (3).

6. The single-lip tetrafluoro oil seal structure according to claim 1, characterized in that: A chamfer is arranged at the end of the third extension part (4). The chamfer is used to reduce the edge stress of the third extension part (4).

7. A single-lip tetrafluoro oil seal structure according to claim 1, characterized in that: Arc segments are arranged at one ends of the first extension part (2) and the second extension part (3) close to the first ring body (1).

8. A single-lip tetrafluoro oil seal structure according to claim 1, characterized in that: The first elastic part (7) is an O-shaped elastic part, and the second elastic part (8) is an oil seal elastic part.

9. A single-lip tetrafluoro oil seal structure according to claim 3, characterized in that: A cut angle is formed on the bending part (6). The cut angle is located at the free end of the bending part (6) to facilitate the entry of the elastic part.

10. A single-lip tetrafluoro oil seal structure according to claim 3, characterized in that: The first ring body (1), the first extension part (2), the second extension part (3), the third extension part (4), the second ring body (5) and the bending part (6) are integrally injection-molded.

Images