skeleton oil seal

Abstract

This application discloses a skeleton oil seal, comprising: a skeleton; a sealing lip assembly, the sealing lip assembly being wrapped around the outside of the skeleton, the skeleton and the sealing lip assembly forming a cavity; a sealing contact surface formed on the side of the sealing lip assembly facing away from the skeleton; and a spring assembly disposed within the cavity and used to provide preload force to the sealing lip assembly. This application discloses a skeleton oil seal to solve the problem of unsatisfactory performance of existing skeleton oil seals.

Description

Technical Field

[0001] This application relates to the field of sealing technology, and more specifically, to a skeleton oil seal. Background Technology

[0002] Oil seals with skeletons are widely used in mechanical equipment, such as rotating shafts. However, existing oil seals are prone to localized wear and leakage due to uneven pressure distribution between the sealing lip and the rotating shaft surface; or, their sealing performance deteriorates under high temperature or high speed conditions; or, they have poor adaptability to shaft eccentricity or vibration.

[0003] Therefore, a skeleton oil seal is needed to solve the above problems. Utility Model Content

[0004] In view of this, the purpose of this application is to propose a skeleton oil seal to solve the problem of unsatisfactory performance of existing skeleton oil seals.

[0005] To achieve the above objectives, this application provides a skeleton oil seal, comprising:

[0006] skeleton;

[0007] A sealing lip assembly, which wraps around the outside of the skeleton, and the skeleton and the sealing lip assembly together form a cavity; the surface of the sealing lip assembly facing away from the skeleton forms a sealing contact surface;

[0008] A spring assembly disposed within the cavity and used to provide preload to the sealing lip assembly.

[0009] Optionally, the skeleton includes an inner skeleton ring and an outer skeleton ring connected to one end of the inner skeleton ring.

[0010] Optionally, the inner skeleton ring and / or the outer skeleton ring are provided with reinforcing ribs.

[0011] Optionally, the sealing lip assembly includes a wrapping section and a sealing section extending from the wrapping section. The wrapping section is used to wrap the skeleton, and the sealing section includes a secondary sealing lip and a primary sealing lip connected in sequence. The sealing contact surface is disposed on the surface of the secondary sealing lip and the primary sealing lip facing away from the skeleton.

[0012] Optionally, an oil reservoir is provided on the secondary sealing lip.

[0013] Optionally, the main sealing lip is provided with a bent surface.

[0014] Optionally, the main sealing lip has a spring groove on the surface facing the skeleton, and the spring assembly includes a spring and at least one engaging member. The spring is disposed in the spring groove, and the engaging member is used to fix the relative positions of the two ends of the spring.

[0015] Optionally, a buffer layer is provided at the bottom of the spring groove.

[0016] Optionally, the sealing lip assembly is at least partially covered with a compensation layer.

[0017] Optionally, the sealing lip assembly is at least partially covered with a self-lubricating coating.

[0018] As can be seen from the above, the skeleton oil seal provided in this application has the following advantages compared with the prior art: the skeleton oil seal has self-adaptive sealing capability, low friction loss and long service life; the spring assembly provides pre-tightening force to the sealing lip assembly, making the contact pressure between the sealing lip assembly and the rotating shaft uniform, avoiding local wear and leakage; the sealing lip assembly has good elastic properties; the skeleton and spring assembly improve the structural performance of the sealing lip assembly, which can prevent failure under high temperature or high speed conditions, thus affecting the sealing performance; moreover, the spring assembly provides pre-tightening force, which can solve the problem of poor adaptability of the sealing lip assembly to the eccentricity or vibration of the rotating shaft. Attached Figure Description

[0019] The above features and technical advantages of this application will become clearer and easier to understand from the following description of its embodiments in conjunction with the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the skeleton oil seal used in a specific embodiment of this application.

[0021] The attached figures are labeled as follows:

[0022] 101. Inner skeleton ring; 102. Outer skeleton ring; 201. Main sealing lip; 202. Secondary sealing lip; 301. Spring; 302. Spring groove; 303. Buffer layer; 401. Compensation layer; 501. Self-lubricating coating. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] Figure 1 This is a schematic diagram of the skeleton oil seal used in a specific embodiment of this application. Figure 1 As shown, the skeleton oil seal includes a skeleton, a sealing lip assembly, and a spring 301 assembly.

[0025] A skeleton oil seal consists of a skeleton; the skeleton has a closed annular structure with a central hole. The skeleton can be made of metal, which provides sufficient structural strength. The skeleton can be shaped according to specific application requirements, such as having an L-shaped or C-shaped cross-section.

[0026] The sealing lip assembly, typically made of rubber, encloses the skeleton. It is a closed annular structure, with the rotating shaft passing through its central hole. The skeleton and sealing lip assembly together form a cavity. When the skeleton has an L-shaped cross-section, the sealing lip assembly, which encloses the skeleton, has a transverse, approximately n-shaped cross-section. The surface of the sealing lip assembly facing away from the skeleton forms a sealing contact surface; this surface is used to contact the rotating shaft.

[0027] The cavity formed by the skeleton and sealing lip assembly is used to accommodate the elastic component. The spring 301 assembly is disposed in the cavity. Typically, the elastic component is fixed at the end of the cavity near the opening. The elastic component is used to provide preload to the sealing lip assembly.

[0028] The sealing lip assembly contacts the rotating shaft through a sealing contact surface to prevent lubricant leakage and the intrusion of external contaminants. The skeleton increases the structural strength of the sealing lip assembly, preventing a decrease in sealing performance under conditions such as vibration, high temperature, and high pressure; the elastic component provides preload to the sealing contact surface, ensuring uniform pressure distribution when the sealing contact surface contacts the rotating shaft surface, thus solving problems such as eccentricity and localized wear.

[0029] The skeleton oil seal features self-adaptive sealing capability, low friction loss, and long service life. The spring 301 assembly provides preload to the sealing lip assembly, ensuring uniform contact pressure between the sealing lip assembly and the rotating shaft, thus preventing localized wear and leakage. The sealing lip assembly has excellent elastic properties. The skeleton and spring 301 assembly improve the structural performance of the sealing lip assembly, preventing failure under high temperature or high speed conditions that could affect sealing performance. Furthermore, the spring 301 assembly provides preload, which can solve problems such as poor adaptability of the sealing lip assembly to eccentricity or vibration of the rotating shaft.

[0030] The skeleton can be a one-piece structure or a modular structure connected together. Optionally, the skeleton includes an inner skeleton ring 101 and an outer skeleton ring 102 connected to one end of the inner skeleton ring. Both the inner skeleton ring 101 and the outer skeleton ring 102 are ring structures, see [reference needed]. Figure 1 The inner skeleton ring 101 is a vertical ring, and the outer skeleton ring 102 is a horizontal ring. The connection between the inner skeleton ring 101 and the outer skeleton ring 102 is a smooth transition.

[0031] In one embodiment of this application, the inner skeleton ring 101 and the outer skeleton ring 102 are connected together by laser welding. This improves the structural stability of the skeleton and effectively enhances its resistance to eccentricity. The surfaces of the inner skeleton ring 101 and / or the outer skeleton ring 102 are provided with an anti-rust coating.

[0032] Optionally, reinforcing ribs are provided on the inner skeleton ring 101 and / or the outer skeleton ring 102. By adding reinforcing ribs, the rigidity and stability of the inner skeleton ring 101 and the outer skeleton ring 102 can be enhanced, thereby improving the overall rigidity and stability of the skeleton.

[0033] In one embodiment of this application, the reinforcing ribs are straight, wavy, or other shapes, and multiple reinforcing ribs are arranged sequentially at intervals on the inner skeleton ring 101 and / or the outer skeleton ring 102.

[0034] To further improve sealing performance, the sealing lip assembly optionally includes a wrapping section and a sealing section extending from the wrapping section. The wrapping section wraps around the skeleton, and the sealing section includes a secondary sealing lip 202 and a primary sealing lip 201 connected in sequence. Sealing contact surfaces are located on the surfaces of the secondary sealing lip 202 and the primary sealing lip 201 facing away from the skeleton. The primary sealing lip 201 and the secondary sealing lip 202 form a double seal, improving sealing performance and preventing leakage. The shape of the wrapping section matches the shape of the skeleton; for example, if the skeleton is L-shaped, the wrapping section is L-shaped. The sealing section has a stepped structure or an approximately transverse "3" shape. The secondary sealing lip 202 is connected to the wrapping section, and the primary sealing lip 201 is connected to the secondary sealing lip 202. The wrapping section and the sealing section together form an approximately transverse n-shape. The sealing contact surfaces contact the rotating shaft and are located on the surfaces of the secondary sealing lip 202 and the primary sealing lip 201 facing away from the skeleton.

[0035] In one embodiment of this application, the wrapping segment includes a vertical segment one, a horizontal segment one, a transition segment, a vertical segment two, and a horizontal segment two arranged sequentially on the outside of the skeleton. The vertical segment one wraps around the free end of the outer skeleton ring 102, and its outer surface has an inclined surface. The horizontal segment one wraps around the main body of the outer skeleton ring 102, and its thickness gradually changes, with its width gradually increasing from the vertical segment one to the transition segment. The transition segment wraps around the connection between the outer skeleton ring 102 and the inner skeleton ring 101, and its outer surface has an inclined surface. The vertical segment two wraps around the main body of the inner skeleton ring 101, and its outer surface has a groove. The horizontal segment two wraps around the free end of the inner skeleton ring 101 and is grooved.

[0036] In one embodiment of this application, the sealing segment includes a two-segment and a three-segment, wherein the two-segment includes a horizontal segment and a downward-sloping segment, which is the secondary sealing lip 202; the three-segment includes a horizontal segment, an upward-sloping segment and a vertical segment, which is the primary sealing lip 201; the connection between the secondary sealing lip 202 and the primary sealing lip 201 is the connection between the two horizontal segments, and the width is the smallest.

[0037] Optionally, an oil reservoir is provided on the secondary sealing lip 202. The oil reservoir is located on the horizontal section of the two-section zigzag pattern, and an arc-shaped groove is provided on the horizontal section. The arc-shaped groove provides storage space to meet the oil storage requirements and further enhance the sealing effect. By using the main sealing lip 201 and the secondary sealing lip 202 in cooperation with each other, and by providing an oil reservoir on the secondary sealing lip 202, a dynamic oil film can be formed, reducing the coefficient of friction.

[0038] In one embodiment of this application, the oil storage tank is a hemispherical pit distributed in a ring array, with a diameter of 0.8-1.5 mm and a depth of 0.3-0.6 mm.

[0039] Optionally, the main sealing lip 201 is provided with a bent surface. The bent surface protrudes towards the side away from the spring 301 assembly and is at an obtuse angle. This bent surface is in direct contact with the rotating shaft, which helps to form a stable oil film and reduce friction.

[0040] Optionally, the main sealing lip 201 has a spring groove 302 on its surface facing the skeleton. The spring 301 assembly includes a spring 301 and at least one engaging member. The spring 301 is disposed within the spring groove 302, which accommodates and defines the position of the spring 301. The engaging member secures the relative positions of the two ends of the spring 301. The engaging member further ensures that the spring 301 will not loosen during installation and use, thus preventing abnormal noise. The spring 301 provides the necessary preload to ensure tight contact between the sealing lip assembly and the rotating shaft.

[0041] In one embodiment of this application, the spring 301 includes, but is not limited to, a helical spring 301, which is embedded in a spring groove 302. The engaging component includes, but is not limited to, a snap-fit ​​structure.

[0042] In one embodiment of this application, the spring groove 302 is disposed on the main sealing lip 201, typically located at the position where the thickness of the main sealing lip 201 is at its maximum, for example, near the end of the main sealing lip 201 away from the secondary sealing lip 202, and facing the surface of the skeleton side.

[0043] To protect the spring 301 from direct wear, a buffer layer 303 may be provided at the bottom of the spring groove 302. The buffer layer 303 fills the space between the bottom of the spring groove 302 and the main sealing lip 201 to absorb vibration and reduce noise.

[0044] In one embodiment of this application, the buffer layer 303 is made of silicone material.

[0045] In one embodiment of this application, the inner wall of the spring groove 302 is provided with anti-slip texture, the texture depth being 0.1-0.3mm.

[0046] Optionally, the sealing lip assembly is at least partially covered with a compensation layer 401. In order to improve the elasticity and wear resistance of the sealing lip assembly, especially the elasticity and wear resistance at the root (the junction of the main sealing lip 201 and the secondary sealing lip 202), a compensation layer 401 is provided on the side surface of the sealing lip assembly facing the skeleton, especially at the junction of the main sealing lip 201 and the secondary sealing lip 202.

[0047] In one embodiment of this application, the compensation layer 401 is made of thermoplastic polyurethane elastomer material with a thickness of 0.5-1.2 mm and a Shore hardness of 75A-90A. The adaptive compensation layer 401 made of thermoplastic polyurethane elastomer material can maintain effective sealing pressure under operating conditions of -40°C to 180°C, thus extending its service life.

[0048] Optionally, the sealing lip assembly is at least partially covered with a self-lubricating coating 501. To improve the lubricity and wear resistance of the sealing lip assembly, especially the lubricity and wear resistance of the main sealing lip 201, a self-lubricating coating 501 is provided on the surface of the main sealing lip 201 facing away from the skeleton, especially at the contact point between the main sealing lip 201 and the rotating shaft.

[0049] In one embodiment of this application, the self-lubricating coating 501 is made of a graphene-containing polytetrafluoroethylene composite material with a thickness of 20-50 μm.

[0050] The following section further describes the usage process of the skeleton oil seal.

[0051] The sealing lip assembly is wrapped around the inner skeleton ring 101 and the outer skeleton ring 102 by a wrapping section. The skeleton increases the structural strength of the sealing lip assembly. The elastic element 301 is fixedly installed in the spring groove 302 by a snap-fit ​​component, providing preload to the sealing contact surface. The sealing lip assembly contacts the rotating shaft through the sealing contact surfaces on the main sealing lip 201 and the secondary sealing lip 202 of the sealing section, providing an effective seal for the rotating shaft.

[0052] As can be seen from the above description and practice, the skeleton oil seal provided in this application has the following advantages compared with the prior art: the skeleton oil seal has self-adaptive sealing capability, low friction loss and long service life; the spring assembly provides pre-tightening force to the sealing lip assembly, making the contact pressure between the sealing lip assembly and the rotating shaft uniform, avoiding local wear and leakage; the sealing lip assembly has good elastic properties; the skeleton and spring assembly improve the structural performance of the sealing lip assembly, which can prevent failure under high temperature or high speed conditions, thus affecting the sealing performance; moreover, the spring assembly provides pre-tightening force, which can solve the problem of poor adaptability of the sealing lip assembly to the eccentricity or vibration of the rotating shaft.

[0053] Those skilled in the art should understand that the above description is merely a specific embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the scope of this application should be included within the protection scope of this application.

Claims

1. A skeleton oil seal characterized in that, include: skeleton; A sealing lip assembly, which wraps around the outside of the skeleton, and the skeleton and the sealing lip assembly together form a cavity; the surface of the sealing lip assembly facing away from the skeleton forms a sealing contact surface; A spring assembly disposed within the cavity and used to provide preload to the sealing lip assembly.

2. The skeleton oil seal according to claim 1, characterized in that: The skeleton includes an inner skeleton ring and an outer skeleton ring connected to one end of the inner skeleton ring.

3. The skeleton oil seal according to claim 2, characterized in that: The inner skeleton ring and / or the outer skeleton ring are provided with reinforcing ribs.

4. The skeleton oil seal according to any one of claims 1 to 3, characterized in that: The sealing lip assembly includes a wrapping section and a sealing section extending from the wrapping section. The wrapping section is used to wrap the skeleton, and the sealing section includes a secondary sealing lip and a primary sealing lip connected in sequence. The sealing contact surface is disposed on the surface of the secondary sealing lip and the primary sealing lip facing away from the skeleton.

5. The skeleton oil seal according to claim 4, characterized in that: An oil reservoir is provided on the secondary sealing lip.

6. The skeleton oil seal according to claim 5, characterized in that: The main sealing lip is provided with a bent surface.

7. The skeleton oil seal according to claim 4, characterized in that: The main sealing lip has a spring groove on the surface facing the skeleton. The spring assembly includes a spring and at least one engaging member. The spring is disposed in the spring groove, and the engaging member is used to fix the relative positions of the two ends of the spring.

8. The skeleton oil seal according to claim 7, characterized in that: A buffer layer is provided at the bottom of the spring groove.

9. The skeleton oil seal according to any one of claims 1 to 3, characterized in that: The sealing lip assembly is at least partially covered with a compensation layer.

10. The skeleton oil seal according to any one of claims 1 to 3, characterized in that: The sealing lip assembly is at least partially covered with a self-lubricating coating.

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