Shock absorber guide seal structure

Abstract

This utility model discloses a shock absorber guide sealing structure, including a guide seat and an oil seal assembly fitted onto the shock absorber piston rod. The guide seat has a guide sleeve and a sealing groove coaxially distributed inside. An O-ring and a guide Glyd ring are coaxially arranged in the sealing groove, with the O-ring located around the guide Glyd ring. An oil seal Glyd ring is embedded in the oil seal assembly, with its lip facing the inside of the shock absorber. A buffer ring is nested inside the guide seat, and the buffer ring contacts one end of the guide sleeve. This utility model, by setting a composite sealing guide unit composed of a guide Glyd ring and an O-ring, ensures a long-lasting and stable contact between the Glyd ring lip and the piston rod by providing uniform radial tension force to the Glyd ring through the O-ring. This combination not only provides excellent radial support, making the piston rod movement smoother and reducing uneven wear, but its double sealing lips also greatly improve the reliability of the seal and effectively prevent hydraulic oil leakage.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic shock absorber technology, and in particular to a shock absorber guide sealing structure. Background Technology

[0002] Shock absorbers are the core components of a vehicle's suspension system, and their performance directly affects ride comfort and handling stability. With the development of high-performance vehicles and heavy machinery, the working pressure requirements for shock absorbers are becoming increasingly stringent. As a key component of the shock absorber, the guide seal structure mainly undertakes three functions: guiding the movement of the piston rod, preventing internal hydraulic oil leakage, and isolating external dust and impurities from entering. The reliability of its sealing and guiding functions directly determines the service life and working efficiency of the shock absorber.

[0003] The existing patent publication number is CN221347709U, and the patent title is "A shock absorber and a vehicle". It includes a cylinder body with a working chamber and an oil reservoir formed within it, the working chamber and the oil reservoir being connected; a piston rod movably disposed within the working chamber; an oil seal disposed between the piston rod and the cylinder body outlet, the oil seal including a sealing element; a guide disposed on the side of the oil seal away from the cylinder body outlet, defining a buffer chamber between the guide, the oil seal, and the piston rod; the guide having a flow groove connected to both the buffer chamber and the oil reservoir; and a sealing element disposed on the side of the flow groove away from the buffer chamber to selectively open the flow groove. By providing a flow groove on the guide and a sealing element on the side of the flow groove away from the buffer chamber, oil in the buffer chamber can flow into the oil reservoir through the flow groove, but high-pressure gas in the oil reservoir cannot enter the working chamber, reducing the deformation of the sealing element and preventing abnormal noise or free play in the shock absorber.

[0004] Including the aforementioned existing technologies, traditional guide seals mostly use a single lip seal or O-ring. Under ultra-high pressure conditions, these seals are prone to problems such as plastic deformation of the sealing material and accelerated wear, leading to oil leakage and shock absorber failure. Leakage not only reduces shock absorption performance but may also pollute the environment and pose safety hazards. Furthermore, when the shock absorber is subjected to extreme impacts, the end of the piston rod's stroke will rigidly collide with the guide seat, generating abnormal noise and potentially damaging the guide seat or piston rod. Utility Model Content

[0005] The purpose of this invention is to provide a shock absorber guide sealing structure to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a shock absorber guide sealing structure, comprising a guide seat and an oil seal assembly fitted on the piston rod of the shock absorber. The guide seat has a guide sleeve and a sealing groove coaxially distributed inside. An O-ring and a guide glyph are coaxially arranged in the sealing groove. The O-ring is located outside the guide glyph. An oil seal glyph is embedded in the oil seal assembly, with its lip facing the inside of the shock absorber. A buffer ring is nested inside the guide seat, and the buffer ring is in contact with one end of the guide sleeve.

[0007] Preferably, the lip of the guide ring is installed facing the oil cavity of the shock absorber.

[0008] Preferably, the guide seat has an annular mounting groove on its outer side, and a sealing ring is embedded in the annular mounting groove.

[0009] Preferably, the oil seal assembly includes an oil seal cover and a metal frame located inside the oil seal cover, with the oil seal glyph covering the metal frame.

[0010] Preferably, the sealing groove has a rectangular cross-section, consisting of groove walls on both sides and a groove bottom, and the O-ring is pressed between the guide glyph and one side of the groove wall.

[0011] Preferably, the back of the lip of the oil seal glyph is provided with a helical spring to provide continuous clamping force to the lip.

[0012] This utility model provides a sealing structure for a shock absorber guide. It has the following beneficial effects:

[0013] This shock absorber guide sealing structure, through the setting of a composite sealing guide unit composed of a guide glyph ring and an O-ring, provides uniform radial tension force to the glyph ring, ensuring a long-lasting and stable contact between the glyph ring lip and the piston rod. This combination not only provides excellent radial support, making the piston rod movement smoother and reducing uneven wear, but its double sealing lips also greatly improve the reliability of the seal and effectively prevent hydraulic oil leakage. By nesting a buffer ring inside the guide seat that contacts the end of the guide sleeve, the buffer ring can absorb the impact energy of the piston rod on the guide seat at the end of its stroke, transforming rigid collision into flexible contact, thereby significantly reducing operating noise, protecting the guide seat and piston rod, and extending the overall service life of the shock absorber. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a shock absorber guide sealing structure proposed in this utility model;

[0015] Figure 2 This is an overall sectional view of a shock absorber guide sealing structure proposed in this utility model;

[0016] Figure 3 This is a schematic diagram of the guide seat in the sealing structure of the shock absorber guide proposed in this utility model;

[0017] Figure 4 This is a schematic diagram of the guide glyph and O-ring in the sealing structure of the shock absorber guide proposed in this utility model.

[0018] Legend:

[0019] 1. Guide seat; 2. Oil seal assembly; 201. Oil seal cover; 202. Metal skeleton; 3. Guide sleeve; 4. Sealing groove; 5. O-ring; 6. Guide Glyd ring; 7. Oil seal Glyd ring; 8. Buffer ring; 9. Annular mounting groove; 10. Sealing ring; 11. Helical spring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figure 1-4A shock absorber guide sealing structure includes a guide seat 1 and an oil seal assembly 2 fitted onto the shock absorber piston rod. The guide seat 1 has a guide sleeve 3 and a sealing groove 4 coaxially distributed inside. An O-ring 5 and a guide glyph 6 are coaxially arranged within the sealing groove 4, with the O-ring 5 located around the guide glyph 6. An oil seal glyph 7 is embedded within the oil seal assembly 2, its lip facing the inside of the shock absorber. As an elastic element, the O-ring is always in a compressed state after installation, providing a uniform and persistent radial clamping force to the guide glyph 6. This force ensures that the lip of the guide glyph 6 can tightly and stably fit against the piston rod surface, forming the first reliable sealing barrier and effectively preventing hydraulic oil leakage inside the shock absorber. On the one hand, this structure provides excellent sealing performance; on the other hand, the guide glyph... The low-friction characteristics and double-lip design of ring 6 further enhance sealing reliability. On the other hand, this unit provides strong radial support for the piston rod, keeping it straight during high-speed reciprocating motion, effectively reducing abnormal wear and uneven wear caused by piston rod wobble, and extending the service life of the piston rod and seals. The oil seal glyph 7 located in the oil seal assembly 2 has its lip facing the oil direction, forming the second and most important sealing line, further preventing any possible trace oil mist from leaking outwards, and preventing external contaminants from entering the guide seat 1. The guide seat 1 is nested with a buffer ring 8, which contacts one end of the guide sleeve 3. When the shock absorber moves to the end of its stroke, the piston rod will strike the guide seat 1 with greater kinetic energy. At this time, the pre-installed buffer ring 8 plays its role. It contacts the end of the guide sleeve 3 and absorbs the impact energy transmitted by the piston rod by using the elastic deformation of its own material. This process transforms the rigid collision between the piston rod and the guide seat 1 that might have occurred into a flexible contact of the elastic body, which significantly reduces the noise generated by the impact. At the same time, the buffering effect protects the guide seat 1 and the piston rod from hard impact damage, thereby extending the overall service life of the shock absorber.

[0022] In a further embodiment of this invention, the lip of the guide glyph 6 is installed facing the oil cavity of the shock absorber. This installation direction is consistent with the lip direction of the oil seal glyph 7 in the oil seal assembly 2, both facing the area of ​​higher pressure oil. This increases the characteristics of active oil scraping and bidirectional sealing, further enhancing the function. During the stroke of the piston rod retracting from the inside of the shock absorber, a certain amount of hydraulic oil will adhere to its surface. When the piston rod moves upward and passes the guide glyph 6 with its lip facing downward, the lip of the glyph can effectively scrape off the excess hydraulic oil adhering to the piston rod, allowing it to flow back into the oil cavity at the bottom of the shock absorber. This oil scraping action can significantly reduce the amount of oil on the surface of the piston rod, greatly reducing the sealing load of the main oil seal and avoiding the potential external leakage caused by the accumulation of oil at the oil seal, thereby further improving the reliability of the overall sealing system. When the shock absorber is working, the pressure in the oil cavity will act on the back of the lip of the guide glyph 6, making its lip fit more tightly against the surface of the piston rod.

[0023] In a further embodiment of this utility model, an annular mounting groove 9 is provided on the outer side of the guide seat 1, and a sealing ring 10 is embedded in the annular mounting groove 9. When the entire guide assembly is pressed into the oil reservoir of the shock absorber, the sealing ring 10 is located precisely between the guide seat 1 and the inner wall of the outer cylinder. After assembling the guide seat 1 and the oil seal assembly 2, the sealing ring 10 must first be installed into the annular mounting groove 9 of the guide seat 1, and then the entire assembly is pressed into the outer cylinder of the shock absorber. After pressing, the sealing ring 10 is radially compressed, forming a tight static seal between the guide seat 1 and the outer cylinder, solving the sealing problem between the guide assembly and the shock absorber housing. It effectively prevents hydraulic oil from leaking from the assembly gap between the guide seat 1 and the outer cylinder, ensuring that all hydraulic oil is confined within the closed cavity formed by the oil seal assembly 2 and this static seal.

[0024] In a further embodiment of this utility model, the oil seal assembly 2 includes an oil seal cover 201 and a metal skeleton 202 located inside the oil seal cover 201. The oil seal glyph 7 is wrapped around the metal skeleton 202. The metal skeleton 202 ensures that the oil seal assembly 2 will not be squeezed and deformed when pressed with the guide seat 1, achieving precise and stable installation. This greatly enhances the deformation resistance of the oil seal assembly 2 under the internal oil pressure of the shock absorber and possible external impacts, avoiding sealing failure caused by shell deformation. The presence of the metal skeleton 202 provides a solid foundation for the elastomer oil seal glyph 7, which prevents the contact pressure of the lip of the oil seal glyph 7 against the piston rod from easily relaxing due to long-term oil immersion, temperature changes, or pressure fluctuations.

[0025] In a further embodiment of this invention, the sealing groove 4 has a rectangular cross-section, consisting of two side walls and a bottom. The O-ring 5 is compressed between the guide glyph 6 and one side wall. The rectangular sealing groove 4 provides a regular, well-defined compression space for the O-ring 5. After the guide glyph 6 is inserted, the O-ring 5 is confined between the flat back of the guide glyph 6 and the vertical wall of the sealing groove 4, making its compression ratio and deformation direction very definite and consistent. This avoids the problem of irregular twisting or uneven compression of the O-ring 5 in irregular grooves or with excessively large gaps, and prevents the guide glyph 6 from axially moving or fretting under the oil pressure fluctuations and friction caused by the reciprocating motion of the piston rod, ensuring the long-term stability of its working position.

[0026] In a further embodiment of this utility model, a helical spring 11 is provided on the back of the lip of the oil seal glyph 7 to provide a continuous clamping force to the lip. The helical spring 11 is pre-installed in the designated groove of the oil seal glyph 7 during the oil seal manufacturing process. When the entire oil seal assembly 2 is pressed onto the guide seat 1 and finally fitted onto the piston rod, the helical spring 11 is stretched due to being stretched by the piston rod, thereby generating a continuous radial clamping force. This provides a constant and adjustable initial contact pressure to the oil seal lip, ensuring that even under zero pressure or low pressure conditions, a very tight basic seal can be formed between the lip and the piston rod, effectively preventing oil leakage and the intrusion of external contaminants.

[0027] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A shock absorber guide sealing structure, comprising a guide seat (1) fitted on the shock absorber piston rod and an oil seal assembly (2), characterized in that: The guide seat (1) is provided with a guide sleeve (3) and a sealing groove (4) coaxially distributed inside. An O-ring (5) and a guide glyph (6) are coaxially arranged inside the sealing groove (4). The O-ring (5) is located outside the guide glyph (6). The oil seal assembly (2) is provided with an oil seal glyph (7) with its lip facing the inside of the shock absorber. The guide seat (1) is nested with a buffer ring (8), which is in contact with one end of the guide sleeve (3).

2. A shock absorber guide seal structure according to claim 1 wherein, The lip of the guide glyph (6) is installed facing the oil cavity of the shock absorber.

3. The shock absorber guide sealing structure according to claim 1, characterized in that, The guide seat (1) has an annular mounting groove (9) on its outer side, and a sealing ring (10) is embedded in the annular mounting groove (9).

4. The shock absorber guide sealing structure according to claim 1, characterized in that, The oil seal assembly (2) includes an oil seal cover (201) and a metal frame (202) located inside the oil seal cover, and the oil seal glyph (7) covers the metal frame (202).

5. A shock absorber g uide seal structure according to claim 1 wherein, The sealing groove (4) has a rectangular cross-section and is composed of groove walls on both sides and a groove bottom. The O-ring (5) is pressed between the guide glyph (6) and the groove wall on one side.

6. A shock absorber g uide seal structure according to claim 1 wherein, The back of the lip of the oil seal glyph (7) is provided with a helical spring (11) to provide continuous clamping force to the lip.

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