A sealing system and its skeleton oil seal

Abstract

This utility model relates to a sealing system and its skeleton oil seal in the field of sealing technology. It includes a rubber body and a skeleton located within the rubber body. The skeleton, along the radial direction of the oil seal, includes a support portion, a conduction portion, and a pressure-bearing portion connected sequentially from the outside to the inside. The pressure-bearing surface of the pressure-bearing portion facing the oil pressure direction is an arc-shaped surface. The skeleton oil seal provided by this utility model improves the structure by making the portion of the skeleton facing the oil pressure direction into an arc-shaped surface. When the rubber body is subjected to oil pressure compressing the pressure-bearing portion of the skeleton, on the one hand, the arc-shaped surface distributes stress, preventing leakage due to uneven stress. On the other hand, the arc-shaped surface effectively avoids stress concentration, preventing oil seal rupture and sealing failure caused by stress concentration.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically to a sealing system and its skeleton oil seal. Background Technology

[0002] Existing skeleton oil seals, due to insufficient bonding strength between the skeleton and rubber, or stress concentration at the sharp corners of the skeleton, can experience bursting at the joint between the skeleton and rubber under high pressure, leading to leakage. For example, see attached... Figure 1 The existing skeleton structure shown can cause instantaneous peak oil pressure of more than 10MPa inside the shock absorber. Existing oil seals with skeletons often experience stress concentration at the sharp corners of the skeleton, which leads to the cracking of the rubber-skeleton bonding interface, resulting in instantaneous oil leakage in the form of "debonding-opening" and shock absorber failure.

[0003] To address the aforementioned issues, some existing technologies employ a separate sealing solution combining an oil seal and a step seal, as detailed in the appendix. Figure 2 As shown. However, this technical solution has problems such as a large number of parts, large axial height, and high cost, making it unsuitable for the mass production needs of shock absorbers in space-constrained and cost-sensitive applications. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a sealing system and its skeleton oil seal.

[0005] According to the present invention, a skeleton oil seal includes a rubber body and a skeleton located in the rubber body; The skeleton includes a support part, a conduction part, and a pressure-bearing part connected in sequence from the outside to the inside along the radial direction of the skeleton oil seal. The pressure-bearing surface of the pressure-bearing part facing the oil pressure direction is an arc surface.

[0006] In some embodiments, the arc of the bearing surface is ≥R0.1mm.

[0007] In some embodiments, the surface of the conductive part facing and / or away from the oil pressure direction is an arc surface.

[0008] In some embodiments, the conductive part has an S-shaped structure.

[0009] In some embodiments, the rubber body includes a main body portion, and an oil-side lip seal portion and an air-side lip seal portion disposed on the main body portion.

[0010] In some embodiments, the skeleton is integrally molded within the rubber body.

[0011] In some embodiments, a spring is also included, which is connected to a connecting groove provided on the rubber body.

[0012] This invention also provides a sealing system that uses the aforementioned skeleton oil seal.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The skeleton oil seal provided by this utility model has an improved arc-shaped surface structure for the part of the skeleton facing the oil pressure direction. When the rubber body is squeezed by oil pressure on the pressure-bearing part of the skeleton, on the one hand, the pressure-bearing surface of the arc-shaped structure decomposes the stress and prevents side leakage caused by uneven force. On the other hand, the pressure-bearing surface of the arc-shaped structure can effectively avoid stress concentration, and avoid damage to the rubber body caused by stress concentration, which may even cause the rubber body to burst and lead to sealing failure. Attached Figure Description

[0014] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A schematic diagram of a structure where stress concentration problems exist using conventional methods in existing technologies; Figure 2 This is a schematic diagram of the structure using a step seal structure in the prior art; Figure 3 This is a schematic diagram of a springless implementation of the skeleton sealing structure in this application; Figure 4 This is a schematic diagram of an embodiment of the skeleton sealing structure containing a spring in this application. Detailed Implementation

[0015] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0016] This embodiment provides a skeleton oil seal, such as Figure 3-4 As shown, it includes a skeleton 1 and a rubber body 2 covering the outside of the skeleton 1. In this embodiment, the skeleton 1 and the rubber body 2 are formed into an integral structure through an integral molding process, which can be well applied to sealing systems such as shock absorbers that need to withstand high pressure.

[0017] like Figure 3As shown, the skeleton 1 is divided into a support part 11, a conduction part 12, and a pressure-bearing part 13 from the outside to the inside along the radial direction of the skeleton oil seal. The support part 11, the conduction part 12, and the pressure-bearing part 13 are integrally formed. The pressure-bearing part 13 is used to bear the oil pressure transmitted through the rubber body 2. The surface of the pressure-bearing part 13 facing the oil pressure direction is denoted as the pressure-bearing surface 131, which adopts a circular arc surface structure. When the rubber body 2 is subjected to oil pressure to compress the pressure-bearing part 13, on the one hand, the stress is distributed by the pressure-bearing surface 131 with a circular arc surface structure, preventing side leakage caused by uneven force. On the other hand, the pressure-bearing surface 131 with a circular arc surface structure will not cause damage to the rubber body 2 when subjected to external force, avoiding damage or even bursting at the connection between the skeleton 1 and the rubber body 2 due to stress concentration, which would lead to sealing failure. In this embodiment, the arc of the pressure-bearing surface 131 is greater than or equal to R0.1mm, preferably greater than or equal to R0.5mm. When the arc of the pressure-bearing surface 131 is less than R0.5mm, stress concentration will still occur due to the small arc. However, when the arc of the pressure-bearing surface 131 is greater than or equal to R0.5mm, the force can be better decomposed and dispersed. The transmission part 12 is used to transmit the pressure received by the pressure-bearing part 13 to the support part 11. In this embodiment, the surface of the transmission part 12 is smoothly transitioned to form an arc surface. Preferably, both the first transmission surface 121 facing the oil pressure direction and the second transmission surface 122 facing away from the oil pressure direction are arc surfaces. Furthermore, the transmission part 12 has an S-shaped structure, which can better avoid stress concentration problems.

[0018] The rubber body 2 mainly includes a main body 21 and an oil-side lip seal 22 and an air-side lip seal 23 located on the main body 21. The main body 21 is used for outer diameter sealing, the oil-side lip seal 22 is used for dynamic sealing, and the air-side lip seal 23 is used for dustproof sealing. In this embodiment, the pressure-bearing part 13 is located between the oil-side lip seal 22 and the air-side lip seal 23.

[0019] In some embodiments, a spring 3 is also included, which is connected to a connecting groove provided on the rubber body 2, and the connecting groove is located on the side of the oil-side lip seal 22. The spring 3 maintains the sealing connection between the right lip seal 22 and the shaft surface.

[0020] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A skeleton oil seal, characterized in that, It includes a rubber body (2) and a skeleton (1) located in the rubber body (2); The skeleton (1) includes a support part (11), a conduction part (12) and a pressure-bearing part (13) connected in sequence from the outside to the inside along the radial direction of the skeleton oil seal. The pressure-bearing surface (131) of the pressure-bearing part (13) facing the oil pressure direction is an arc surface.

2. The skeleton oil seal according to claim 1, characterized in that, The arc of the bearing surface (131) is ≥R0.1mm.

3. The skeleton oil seal according to claim 1, characterized in that, The conductive part (12) has a circular arc surface facing and / or away from the oil pressure direction.

4. The skeleton oil seal according to claim 3, characterized in that, The conductive part (12) has an S-shaped structure.

5. The skeleton oil seal according to claim 1, characterized in that, The rubber body (2) includes a main body (21), and an oil-side lip seal (22) and an air-side lip seal (23) provided on the main body (21).

6. The skeleton oil seal according to any one of claims 1-5, characterized in that, The skeleton (1) is integrally formed within the rubber body (2).

7. The skeleton oil seal according to claim 5, characterized in that, It also includes a spring (3), which is connected to a connecting groove provided on the rubber body (2).

8. A sealing system, characterized in that, The skeleton oil seal as described in any one of claims 1-7 is adopted.

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