Oil seal with bidirectional sealing structure and production process thereof

Abstract

The invention provides an oil seal with a bidirectional sealing structure and a production process thereof, the oil seal comprises an oil seal main body, a first lip and a second lip, the first lip and the second lip are arranged on the inner ring wall of the oil seal main body side by side in the axial direction of the oil seal main body, and the first lip, the second lip and the oil seal main body are integrally formed; the first lip is bent towards an outer opening, the second lip is bent towards an inner opening, and the first lip and the second lip are used for being in interference fit with a rotating shaft so as to achieve bidirectional sealing of the rotating shaft in the vertical direction. By the adoption of the integrated lip, installation is easier and more convenient, other parts are simplified, the structure is simpler, the part demand quantity is smaller, and the production and manufacturing cost is lower. And the lip structures facing the opposite directions are arranged, the inner side and the outer side of the oil seal are sealed correspondingly, two-way sealing can be achieved, the sealing effect is better, the installation space can be reduced, and applicability is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of oil seal structures, and in particular to an oil seal with a bidirectional sealing structure and a production process thereof. Background Art

[0002] An oil seal is a common term for seals, or simply a lubricant seal. It's a mechanical component used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to liquid substances in general). It isolates lubricated components from output components within the transmission, preventing lubricant leakage. Seals used for both static and dynamic sealing are called oil seals.

[0003] Conventional oil seals typically utilize a rubber seal with a metal frame, vulcanized together using a vulcanization mold, and then assembled with springs and other components. These seals are suitable for low pressure applications and are primarily designed for single-sided compression. Conventional metal-framed PTFE lip oil seals require metal stamping dies for production, resulting in high manufacturing costs and complex assembly. Conventional all-PTFE oil seals, due to processing limitations, are typically only designed for single-sided compression.

[0004] There is a need for an oil seal with a bidirectional sealing structure and a production process thereof, which can solve the above-mentioned problems. Summary of the Invention

[0005] The present invention provides an oil seal with a bidirectional sealing structure and a production process thereof, which solves the problems of high cost and complicated installation of the existing oil seal structure by technically transforming the existing oil seal structure.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] An oil seal with a bidirectional sealing structure includes an oil seal body, a first lip and a second lip. The first lip and the second lip are arranged side by side on the inner ring wall of the oil seal body along the axial direction of the oil seal body, and the first lip, the second lip and the oil seal body are integrally formed. The first lip is bent toward the outward opening, and the second lip is bent toward the inward opening. The first lip and the second lip are used to interference fit with a rotating shaft to achieve bidirectional sealing in the vertical direction of the rotating shaft.

[0008] Preferably, the outer ring of the oil seal body is provided with an annular groove, and a sealing ring structure is provided in the annular groove. The sealing ring structure is used to provide radial sealing for the outer peripheral side of the oil seal body.

[0009] Preferably, the inner wall of the oil seal body is further provided with a third lip and a fourth lip below the second lip, the third lip is bent toward the outer opening, and the fourth lip is bent toward the lower inner opening.

[0010] Preferably, an upper chamber is formed above the first lip on the oil seal body, an intermediate chamber is formed between the second lip and the third lip, and a lower chamber is formed below the fourth lip, the first liquid inlet, the second liquid inlet and the third liquid inlet are respectively arranged on the oil seal body, the first liquid outlet channel, the second liquid outlet channel and the third liquid outlet channel are respectively arranged in the rotating shaft, the first liquid inlet is connected with the first liquid outlet channel through the upper chamber, the second liquid inlet is connected with the second liquid outlet channel through the intermediate chamber, and the third liquid inlet is connected with the third liquid outlet channel through the lower chamber.

[0011] A production process of the oil seal with the bidirectional sealing structure, comprising the following steps,

[0012] S1, machining and forming the oil seal body;

[0013] S2, preheating the oil seal body to 150 DEG C + / - 10 DEG C;

[0014] S3, after fixing the oil seal body, inserting the oil seal body through the shaping clamp, and bending and shaping the first lip and the second lip in the inner cavity of the oil seal body to the same side;

[0015] S4, cooling for 5-10 min and then taking out;

[0016] S5, straightening the first lip on the outer side of the oil seal body;

[0017] S6, after fixing the oil seal body, inserting the oil seal body through the shaping clamp from the opposite direction of step S3 for the second time to bend and shape, so that the straightened first lip is bent to the opposite direction of the second lip, and the shaping clamp is inserted for 5-10 min and then taken out.

[0018] Preferably, in steps S3 and S6, the shaping clamp is in a cylindrical shape, and a beveled surface is arranged at the front end of the shaping clamp.

[0019] Preferably, the beveled surface is inclined to the vertical direction at an angle of 10-15 DEG, and a rounded corner is arranged at the top end of the beveled surface.

[0020] The application has the advantages that:

[0021] The application is more convenient to install with the integrated lip, simplifies other parts, has a simpler structure, requires less parts, and has lower production and manufacturing costs.

[0022] The application is provided with the first lip and the second lip facing opposite directions, respectively seals the inner and outer sides of the oil seal, can realize bidirectional sealing, and has better sealing effect.

[0023] And the application can realize the transmission of multi-channel rotating fluid of multiple liquids, has more diversified functions, can reduce the installation space, and has stronger applicability. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of embodiment 1 of the application;

[0025] Figure 2 is a structural schematic diagram of embodiment 2 of the application;

[0026] Figures 3-4 is a processing schematic diagram of step S3 of the production process of embodiment 1 of the application;

[0027] Figure 5 is a processing schematic diagram of step S5 of the production process of embodiment 1 of the application;

[0028] Figures 6-7 is a processing schematic diagram of step S3 of the production process of embodiment 2 of the application;

[0029] Figure 8 is a processing schematic diagram of step S5 of the production process of embodiment 2 of the application;

[0030] Figure 9 is a multi-channel oil seal structure schematic diagram of embodiment 2 of the application;

[0031] Explanation of reference numerals: oil seal body 1, annular groove 11, sealing ring structure 12, first liquid inlet 13, second liquid inlet 14, third liquid inlet 15, upper chamber 16, middle chamber 17, lower chamber 18, first lip 2, second lip 3, third lip 4, fourth lip 5, rotating shaft 6, first liquid outlet channel 61, second liquid outlet channel 62, third liquid outlet channel 63, shaping clamp 7, inclined conical surface 71. DETAILED DESCRIPTION

[0032] The specific content of the application will be described in detail below in combination with the drawings and embodiments.

[0033] Please refer to Figures 1-9 The application provides an oil seal with a bidirectional sealing structure, which comprises an oil seal body 1, a first lip 2 and a second lip 3. The first lip 2 and the second lip 3 are arranged in parallel along the axial direction of the oil seal body 1 on the inner ring wall of the oil seal body 1, and the first lip 2, the second lip 3 and the oil seal body 1 are integrally formed. The first lip 2 is outwardly curved, and the second lip 3 is inwardly curved. The first lip 2 and the second lip 3 are used for interference fit with a rotating shaft 6 to realize bidirectional sealing of the rotating shaft 6 in the upward and downward directions.

[0034] The first lip 2 (outward) blocks the invasion of external contaminants, and the second lip 3 (inward) prevents the leakage of internal lubricants. The first lip 2 and the second lip 3 are designed with interference with the rotating shaft 6, and the sealing performance and friction power consumption are considered.

[0035] Further, in order to obtain better sealing effect, the oil seal body 1 outer ring is provided with an annular groove 11, and a sealing ring structure 12 is arranged in the annular groove 11. The sealing ring structure 12 is used to provide radial sealing for the outer peripheral side of the oil seal body 1. The sealing ring structure 12 is made of fluororubber (FKM), the cross section is O-shaped, the installation pre-compression rate is 15%-20%, and the radial sealing reliability of the shell hole is ensured.

[0036] In order to obtain better wear resistance, the outer surfaces of the first lip 2 and the second lip 3 are further provided with a wear-resistant protective layer, which can be selected from diamond-like carbon film with a thickness of 2μm, a friction coefficient of ≤0.1 and a wear-resistant life of ≥5000h.

[0037] Further, the third lip 4 and the fourth lip 5 are arranged below the second lip 3 on the inner wall of the oil seal body 1. The third lip 4 is arranged in a curved manner towards the outward opening direction, and the fourth lip 5 is arranged in a curved manner towards the downward and inward opening direction.

[0038] The size specifications of the oil seal body, the lip and the shaping clamp are selected according to the design and use needs.

[0039] Further, as shown in Figure 9 In order to realize the transmission of multiple liquids, an upper chamber 16 is formed above the first lip 2 in the oil seal body 1, an intermediate chamber 17 is formed between the second lip 3 and the third lip 4, and a lower chamber 18 is formed below the fourth lip 5. First, second and third liquid inlets 13, 14 and 15 are respectively arranged on the oil seal body 1, and first, second and third liquid outlets 61, 62 and 63 are respectively arranged in the rotating shaft 6. The first liquid inlet 13 is connected with the first liquid outlet 61 through the upper chamber 16, the second liquid inlet 14 is connected with the second liquid outlet 62 through the intermediate chamber 17, and the third liquid inlet 15 is connected with the third liquid outlet 63 through the lower chamber 18.

[0040] The present application supports three-channel independent transmission (such as hydraulic oil, cooling water and lubricating grease), and the medium temperature range is -40℃-200℃.

[0041] A production process of the oil seal with the bidirectional sealing structure is provided, which comprises the following steps,

[0042] S1, machining the oil seal body 1;

[0043] S2, preheating the oil seal body 1 to 150℃;

[0044] S3, after fixing the oil seal body 1, the shaping clamp 7 is inserted into the oil seal body 1, and the first lip 2 and the second lip 3 in the inner cavity of the oil seal body 1 are bent and shaped to the same side;

[0045] S4, cooling for 5-10 min and then taking out;

[0046] S5, the first lip 2 outside the oil seal body 1 is straightened and arranged;

[0047] S6, after fixing the oil seal body 1, the shaping clamp 7 is inserted into the oil seal body 1 from the opposite direction of step S3 for the second time to bend and shape, so that the straightened first lip 2 is bent in the opposite direction of the second lip 3, and the shaping clamp 7 is inserted for 5-10 min and then taken out.

[0048] Further, in steps S3 and S6, the shaping clamp 7 is in a cylindrical shape, and the front end of the shaping clamp 7 is provided with an inclined conical surface 71.

[0049] In step S5, the first lip 2 of the oil seal body 1 can be straightened and arranged by artificial, or can be straightened by an automatic equipment driving assembly.

[0050] In another embodiment 2, the production process includes the following steps:

[0051] S1, machining the oil seal body 1;

[0052] S2, preheating the oil seal body 1 to 150°C;

[0053] S3, after fixing the oil seal body 1, the shaping clamp 7 is inserted into the oil seal body 1, and the first lip 2, the second lip 3, the third lip 4 and the fourth lip 5 in the inner cavity of the oil seal body 1 are bent and shaped to the same side;

[0054] S4, cooling for 5-10 min and then taking out;

[0055] S5, the first lip 2 outside the oil seal body 1 is straightened and arranged;

[0056] S6, after fixing the oil seal body 1, the shaping clamp 7 is inserted into the oil seal body 1 from the opposite direction of step S3 for the second time to bend and shape, so that the straightened first lip 2 is bent in the opposite direction of the second lip 3, and the straightened third lip 4 is bent in the opposite direction of the fourth lip 5, and the shaping clamp 7 is inserted for 5-10 min and then taken out.

[0057] Further, in order to facilitate the pushing of the lip to form a curved shape, the inclined taper surface 71 is inclined at an angle of 10-15° to the vertical direction, and the top end of the inclined taper surface 71 is provided with a rounded corner. In a specific embodiment, the inclined taper surface 71 is inclined at an angle of 12°±0.5°, and the rounded corner at the top end has a radius R of 0.5 mm, thereby reducing the risk of indentation, bruising, scratching and other adverse effects of the product during insertion. The surface roughness of the shaping fixture 7 is Ra≤0.8 μm.

[0058] The application is more convenient to install due to the one-piece lip, and other parts are simplified, the structure is simpler, the part demand is smaller, and the production cost is lower.

[0059] The application is provided with the first lip 2 and the second lip 3 facing opposite directions, respectively sealing the inner and outer sides of the oil seal, and can realize bidirectional sealing, and the bidirectional sealing pressure bearing capacity is higher, and the sealing effect is better.

[0060] And the application can realize the transmission of multi-channel rotating fluid of various liquids, and the function is more diverse and the applicability is stronger.

[0061] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the application and are not limiting, and although the application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the application, and they should be covered in the scope of the claims of the application.

[0062] The standard parts used in the application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the mechanical parts and equipment adopt the conventional types in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0063] In the description of the application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be connected through an intermediate medium; it can be the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

Claims

1. An oil seal having a bidirectional seal structure, characterized by, The oil seal body, the first lip and the second lip are arranged on the inner wall of the oil seal body in parallel along the axial direction of the oil seal body, and the first lip, the second lip and the oil seal body are integrally formed, the first lip is arranged to be curved towards the outside, the second lip is arranged to be curved towards the inside, and the first lip and the second lip are used to be in interference fit with the rotating shaft to realize bidirectional sealing of the rotating shaft in the upward and downward directions.

2. The oil seal having a bidirectional sealing structure according to claim 1, characterized by, An annular groove is arranged on the outer wall of the oil seal body, and a sealing ring structure is arranged in the annular groove, which is used to provide radial sealing for the outer wall of the oil seal body.

3. The oil seal having a bidirectional sealing structure according to claim 1, wherein A third lip and a fourth lip are arranged below the second lip on the inner wall of the oil seal body, the third lip is arranged to be curved towards the outside, and the fourth lip is arranged to be curved towards the inside.

4. The oil seal having a bidirectional sealing structure according to claim 3, wherein An upper chamber is formed above the first lip in the oil seal body, an intermediate chamber is formed between the second lip and the third lip, and a lower chamber is formed below the fourth lip, a first liquid inlet, a second liquid inlet and a third liquid inlet are arranged on the oil seal body, a first liquid outlet channel, a second liquid outlet channel and a third liquid outlet channel are arranged in the rotating shaft, the first liquid inlet is connected with the first liquid outlet channel through the upper chamber, the second liquid inlet is connected with the second liquid outlet channel through the intermediate chamber, and the third liquid inlet is connected with the third liquid outlet channel through the lower chamber.

5. A process for producing an oil seal having a bidirectional sealing structure according to any one of claims 1 to 4, characterized by, The method comprises the following steps, S1, machining the oil seal body; S2, preheating the oil seal body to 150℃±10℃; S3, after the oil seal body is fixed, a shaping clamp is inserted into the oil seal body to bend and shape the first lip and the second lip in the inner cavity of the oil seal body to the same side; S4, cooling for 5-10 minutes and then taking out; S5, straightening the first lip on the outer side of the oil seal body; S6, after the oil seal body is fixed, the shaping clamp is inserted into the oil seal body from the opposite direction of step S3 to bend and shape the oil seal body for the second time, so that the straightened first lip is bent towards the opposite direction of the second lip, and the shaping clamp is inserted for 5-10 minutes and then taken out.

6. A process for producing an oil seal having a bidirectional sealing structure according to claim 5, characterized in that, In steps S3 and S6, the shaping clamp is in a cylindrical shape, and a beveled surface is arranged at the front end of the shaping clamp.

7. The process for producing an oil seal having a bidirectional sealing structure according to claim 5, wherein The beveled surface is inclined to the vertical direction at an angle of 10-15°, and a rounded corner is arranged at the top end of the beveled surface.

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