Skeleton oil seal

Abstract

The utility model discloses a kind of framework oil seals, including metal framework (1) and the rubber sealing layer (2) of coating in the surface of metal framework (1);The rubber sealing layer (2) is provided with at least two coaxial settings, and the annular sealing convex lip (3) of outward bulge is located in the position of the outer circumferential surface of metal framework (1).The utility model has the advantages of high sealing reliability, good fault tolerance, which is conducive to improving the qualified rate, durability and production efficiency of shock absorber finished product.

Description

Technical Field

[0001] This utility model relates to the field of oil seal technology, and in particular to an external sealing structure for an oil seal on an automotive shock absorber skeleton. Background Technology

[0002] In automotive shock absorbers, the skeleton oil seal is a key component for achieving static sealing. Currently, the outer diameter seal of this type of oil seal skeleton often employs a fine serrated (threaded) structure. This structure relies on the interference fit between the serrated peaks and the inner bore of the oil seal seat to generate extremely high surface pressure to achieve a seal. However, this structure has significant drawbacks: it requires extremely high dimensional accuracy and surface finish in the machining of the inner bore of the oil seal seat, and has poor tolerance for errors; in actual assembly and use, even slight dimensional deviations or deformations can easily lead to incomplete sealing and static oil leakage.

[0003] Therefore, it is necessary to improve the existing skeleton oil seal to solve the problems of the sawtooth sealing structure of the existing skeleton oil seal being sensitive to the mating dimensions and prone to static oil leakage. Utility Model Content

[0004] The purpose of this utility model is to provide a skeleton oil seal, which has the advantages of high sealing reliability and good fault tolerance, and is conducive to improving the qualification rate, durability and production efficiency of shock absorber finished products.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a skeleton oil seal, comprising a metal skeleton and a rubber sealing layer covering the surface of the metal skeleton; the rubber sealing layer is provided with at least two coaxially arranged and outwardly protruding annular sealing lips at positions corresponding to the outer circular surface of the metal skeleton.

[0006] By adopting the above technical solution, the skeleton oil seal has the following advantages: 1. Tolerance adaptability: For larger oil seal seat holes, the annular sealing lip has sufficient deformation allowance to maintain contact pressure; for smaller oil seal seat holes, its smooth profile also facilitates pressing in.

[0007] 2. Anti-ejection: The annular sealing lip is continuously compressed during the press-fitting process, generating a smoothly changing resistance rather than sudden jamming. When the press-fitting is in place, the entire skeleton oil seal intends to rebound, but at this time the annular sealing lip is still in a compressed state, and its rebound force is radially outward, thus tightly "holding" the oil seal seat and avoiding axial "ejection" force.

[0008] 3. Prevent long-term detachment: The continuous radial elastic clamping force can effectively compensate for the gaps caused by material creep and vibration, achieving "self-adaptive" clamping.

[0009] Therefore, this skeleton oil seal has the advantages of high sealing reliability and good fault tolerance, which is conducive to improving the qualification rate, durability and production efficiency of the finished shock absorber.

[0010] The present invention is further configured such that the lower end of the metal frame is provided with an bulging part, the outer diameter of the bulging part is larger than the outer diameter of the upper end of the metal frame, and the outer diameter of the rubber sealing layer corresponding to the upper end of the metal frame is equivalent to the outer diameter of the corresponding bulging part.

[0011] By adopting the above technical solution, the expansion joint has the function of guiding and automatically correcting the pressing process. That is, after adding an expansion joint to the lower end of the metal frame, the amount of adhesive used on the surface of the expansion joint at the lower end of the metal frame is reduced. This not only has a sealing function, but also a guiding function during pressing, preventing the misalignment that occurs during pressing, which is similar to traditional sealing structures. This can lead to stress concentration on one side, and the rubber sealing layer may yield and deform after the temperature rises during the operation of the shock absorber, resulting in oil leakage.

[0012] The present invention is further provided with a tapered guide portion between the bulging part and the upper end of the metal frame.

[0013] By adopting the above technical solution, the tapered guide part plays a role in the uniform transition between the upper part of the metal skeleton and the expansion part, and provides precise guidance for the press-fitting of the skeleton oil seal and the oil seal seat, making assembly more labor-saving and convenient.

[0014] The present invention is further provided with a sealing sleeve at the inner edge of the upper end of the metal frame, the sealing sleeve and the rubber sealing layer being an integral structure, and at least one spring ring being sleeved on the outer circumference of the sealing sleeve.

[0015] By adopting the above technical solution, the spring ring provides continuous radial pressure to the sealing sleeve, ensuring that the inner surface of the sealing sleeve is tightly pressed against the surface of the shock absorber connecting rod, thus forming an effective seal. Even when the sealing sleeve is used for a long time or when high temperatures cause rubber fatigue and wear, the radial preload of the spring ring can automatically compensate for the loss of rubber material properties, maintaining a good sealing effect.

[0016] The present invention is further configured such that the outer circumference of the sealing sleeve is provided with an annular positioning groove in a number equivalent to that of the spring ring, and the spring ring is embedded in the corresponding annular positioning groove.

[0017] By adopting the above technical solution, an annular positioning groove is set on the outer circumference of the sealing sleeve to position the spring ring. This not only makes installation convenient but also improves the firmness of the spring ring installation, preventing it from shifting or falling off during the operation of the skeleton oil seal.

[0018] The present invention is further configured such that the inner circular surface of the sealing sleeve is provided with multiple coaxially arranged and inwardly protruding annular sealing flanges, and the spring ring is disposed on the outer circular surface of the sealing sleeve between two adjacent annular sealing flanges.

[0019] By adopting the above technical solution, the annular sealing flange on the sealing sleeve can increase the contact stress between it and the shock absorber connecting rod, thereby enhancing the sealing performance between the two.

[0020] The present invention is further configured such that the rubber sealing layer is formed on the surface of the metal skeleton by vulcanization.

[0021] By adopting the above technical solution, the vulcanization process is used to achieve an efficient combination of rubber sealing layer and metal skeleton, which has both high strength and good durability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0023] In the diagram: 1. Metal skeleton; 2. Rubber sealing layer; 3. Annular sealing lip; 4. Expanded opening; 5. Conical guide; 6. Sealing sleeve; 7. Spring ring; 8. Annular positioning groove; 9. Annular sealing flange. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example: As attached Figure 1 The illustrated skeleton oil seal includes a metal skeleton 1 and a rubber sealing layer 2 covering the surface of the metal skeleton 1. The cross-section of the metal skeleton 1 is an inverted L-shape. The rubber sealing layer 2 has at least two coaxially arranged and outwardly protruding annular sealing lips 3 corresponding to the outer circular surface of the metal skeleton 1. This invention uses two annular sealing lips 3 as an example, and the outer contour of the annular sealing lips 3 has a smooth, arc-shaped transition. This design gives the skeleton oil seal the following advantages: 1. Tolerance adaptability: For larger oil seal seat holes, the annular sealing lip 3 has sufficient deformation allowance to maintain contact pressure; for smaller oil seal seat holes, its smooth profile also facilitates pressing in.

[0026] 2. Anti-ejection: The annular sealing lip 3 is continuously compressed during the press-fitting process, generating a smoothly changing resistance rather than sudden jamming. When the press-fitting is in place, the entire skeleton oil seal intends to rebound, but at this time the annular sealing lip 3 is still in a compressed state, and its rebound force is radially outward, thus tightly "holding" the oil seal seat and avoiding axial "ejection" force.

[0027] 3. Prevent long-term detachment: The continuous radial elastic clamping force can effectively compensate for the gaps caused by material creep and vibration, achieving "self-adaptive" clamping.

[0028] Therefore, this skeleton oil seal has the advantages of high sealing reliability and good fault tolerance, which is conducive to improving the qualification rate, durability and production efficiency of the finished shock absorber.

[0029] As attached Figure 1 As shown, the lower end of the metal frame 1 is provided with an bulge portion 4, i.e., an outward expansion treatment. The outer diameter of the bulge portion 4 is larger than the outer diameter of the upper end of the metal frame 1, and the outer diameter of the rubber sealing layer 2 corresponding to the upper end of the metal frame 1 is approximately the same as the outer diameter of the corresponding bulge portion 4. The bulge portion 4 has a guiding and automatic correction function during press-fitting. That is, after adding a bulge portion 4 to the lower end of the metal frame 1, the amount of adhesive used on the surface of the bulge portion 4 at the lower end of the metal frame 1 is reduced. This serves both a sealing function and a guiding function during press-fitting, preventing the misalignment that occurs during press-fitting, similar to traditional sealing structures, which can lead to stress concentration on one side and, when the temperature rises during vibration damper operation, cause the rubber sealing layer 2 to yield and deform, resulting in oil leakage.

[0030] As attached Figure 1 As shown, a tapered guide 5 is provided between the bulging part 4 and the upper end of the metal frame 1. The tapered guide 5 is part of the metal frame 1, and the two are integrated. The tapered guide 5 plays a role in the uniform transition between the upper part of the metal frame 1 and the bulging part 4, and provides precise guidance for the press-fitting of the frame oil seal and the oil seal seat, making assembly more labor-saving and convenient.

[0031] As attached Figure 1 As shown, a sealing sleeve 6 is provided at the inner edge of the upper end of the metal frame 1. The sealing sleeve 6 and the rubber sealing layer 2 are integrally formed. At least one spring ring 7 is fitted onto the outer circumference of the sealing sleeve 6. The spring ring 7 provides continuous radial pressure to the sealing sleeve 6, causing the inner circumference of the sealing sleeve 6 to be tightly pressed against the surface of the shock absorber connecting rod, forming an effective seal. Even when the sealing sleeve 6 is used for a long time or when high temperature causes rubber fatigue and wear, the radial preload of the spring ring 7 can automatically compensate for the loss of rubber material properties and maintain a good sealing effect.

[0032] As attached Figure 1As shown, the outer circumference of the sealing sleeve 6 is provided with annular positioning grooves 8 in a number corresponding to the number of spring rings 7, and the spring rings 7 are embedded in the corresponding annular positioning grooves 8. By providing annular positioning grooves 8 on the outer circumference of the sealing sleeve 6 for positioning the spring rings 7, not only is installation convenient, but the firmness of the spring rings 7 installation is also improved, preventing them from shifting or falling off during the operation of the skeleton oil seal.

[0033] As attached Figure 1 As shown, the inner circular surface of the sealing sleeve 6 is provided with multiple coaxially arranged and inwardly protruding annular sealing flanges 9, and the spring ring 7 is disposed on the outer circular surface of the sealing sleeve 6 between two adjacent annular sealing flanges 9. The annular sealing flanges 9 on the sealing sleeve 6 can increase the contact stress between it and the shock absorber connecting rod, thereby enhancing the sealing performance between the two.

[0034] Furthermore, the rubber sealing layer 2 is formed onto the surface of the metal skeleton 1 through vulcanization. The vulcanization process achieves an efficient bond between the rubber sealing layer 2 and the metal skeleton 1, resulting in both high strength and good durability.

Claims

1. A skeleton oil seal, comprising a metal skeleton (1) and a rubber sealing layer (2) covering the surface of the metal skeleton (1); characterized in that: The rubber sealing layer (2) is provided with at least two coaxially arranged and outwardly protruding annular sealing lips (3) at the position corresponding to the outer circular surface of the metal skeleton (1).

2. The skeleton oil seal according to claim 1, characterized in that: The lower end of the metal frame (1) is provided with an expansion portion (4), the outer diameter of the expansion portion (4) is larger than the outer diameter of the upper end of the metal frame (1), and the outer diameter of the rubber sealing layer (2) corresponding to the upper end of the metal frame (1) is equivalent to the outer diameter of the corresponding expansion portion (4).

3. The skeleton oil seal according to claim 2, characterized in that: A tapered guide (5) is provided between the bulging part (4) and the upper end of the metal frame (1).

4. The skeleton oil seal according to claim 1, characterized in that: A sealing sleeve (6) is provided at the inner edge of the upper end of the metal frame (1). The sealing sleeve (6) and the rubber sealing layer (2) are an integral structure. At least one spring ring (7) is sleeved on the outer circular surface of the sealing sleeve (6).

5. A skeleton oil seal according to claim 4, characterized in that: The outer circumference of the sealing sleeve (6) is provided with annular positioning grooves (8) in a number equivalent to those of the spring rings (7), and the spring rings (7) are embedded in the corresponding annular positioning grooves (8).

6. A skeleton oil seal according to claim 4, characterized in that: The inner circular surface of the sealing sleeve (6) is provided with multiple coaxially arranged and inwardly protruding annular sealing flanges (9), and the spring ring (7) is disposed on the outer circular surface of the sealing sleeve (6) between two adjacent annular sealing flanges (9).

7. A skeleton oil seal according to claim 1, characterized in that: The rubber sealing layer (2) is formed on the surface of the metal skeleton (1) by vulcanization.

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