Oil seal outer diameter structure

Abstract

The utility model relates to the technical field of oil seal structures, in particular to an oil seal outer diameter structure which comprises a protruding part and a continuous solid part. The protruding part in interference fit with the inner wall of the oil storage cylinder is arranged on the outer diameter of the oil seal, oil seal positioning is achieved, and good coaxiality of the outer diameter of the oil seal and the inner diameter of the oil storage cylinder is guaranteed. Through the bosses and the air channels which are arranged at intervals, air circulation is achieved, and the problem that the oil seal climbs upwards due to the fact that the internal pressure of the shock absorber is increased in the assembling process is solved. The continuous solid part which is in clearance fit with the inner wall of the oil storage cylinder is arranged on the outer diameter of the oil seal, so that gas in the shock absorber can be discharged from the clearance of the outer diameter in the pressing process of the oil seal, and the oil seal can be correctly mounted in place to form effective sealing. For an oil seal with an inflatable outer diameter, the outer diameter structure of the oil seal can solve the problem that the outer diameter is difficult to inflate.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seal structures, in particular to an oil seal outer diameter structure. Background Art

[0002] The oil seal is a sealing component whose primary function is to prevent oil from leaking from the shock absorber to the outside. It also prevents external impurities such as dust, sand, and water from entering the shock absorber. The outer diameter of the oil seal is the part that fits into the mounting hole. It has two main functions: to ensure a static seal and to ensure that the oil seal remains in a stable position during installation and use.

[0003] To ensure outer diameter sealing and achieve oil seal positioning, the maximum outer diameter of the oil seal and the inner diameter of the oil reservoir are in a transition or interference fit. In existing oil seal designs, the maximum outer diameter of the oil seal is a rubber entity of equal radius, forming a continuous contact surface with the inner diameter of the oil reservoir. However, during the assembly process, as the oil seal starts to contact the oil reservoir and is pressed down to contact the guide, it compresses the gas in the sealed shock absorber cavity, causing the internal pressure of the shock absorber to increase. During assembly without preload, excessive internal pressure in the shock absorber may lift the oil seal, causing the oil seal to climb up, abnormal shock absorber assembly, etc. For outer diameter inflatable oil seals, an unreasonable design of the oil seal outer diameter interference will cause inflation difficulties and affect the assembly of the shock absorber. Utility Model Content

[0004] Technical purpose: In order to overcome the deficiencies in the prior art, the utility model provides an oil seal outer diameter structure, which ensures outer diameter sealing while solving the oil seal climbing problem during shock absorber assembly.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the utility model discloses an oil seal outer diameter structure, including a raised portion and a continuous solid portion, the raised portion has an interference fit with the inner wall of the oil storage cylinder, the continuous solid portion has a clearance fit with the inner wall of the oil storage cylinder, and the raised portion and the continuous solid portion are formed as one piece.

[0006] Furthermore, the raised portion includes a plurality of bosses, which are evenly arranged around the axis of the oil seal, and an air channel is provided between two bosses for gas circulation.

[0007] Furthermore, the raised portion and the continuous solid portion are continuously arranged up and down, and the raised portion is arranged at the upper portion of the outer diameter of the oil seal.

[0008] Furthermore, the raised portion and the continuous solid portion are continuously arranged up and down, and the raised portion is arranged in the middle of the outer diameter of the oil seal.

[0009] Furthermore, the inner diameter of the oil storage cylinder is d3, the maximum outer diameter of the protrusion is d1, and d1 and d3 satisfy: d3+0.1mm≤d1≤d3+0.3mm.

[0010] Furthermore, the inner diameter of the oil storage cylinder is d3, the maximum outer diameter of the continuous solid portion is d2, and d2 and d3 satisfy: d3-0.1mm≤d2≤d3-0.2mm.

[0011] Compared with the prior art, the present invention has at least the following beneficial effects:

[0012] 1. The oil seal is positioned by setting a raised portion on the outer diameter of the oil seal that has an interference fit with the inner wall of the oil storage cylinder, ensuring good coaxiality between the outer diameter of the oil seal and the inner diameter of the oil storage cylinder; the bosses and air channels are arranged at intervals to achieve gas circulation, avoiding the problem of oil seal climbing due to increased internal pressure of the shock absorber during assembly.

[0013] 2. By setting a continuous solid part on the outer diameter of the oil seal to match the gap between the inner wall of the oil storage cylinder, the gas in the shock absorber can be released from the outer diameter gap during the downward pressure of the oil seal, ensuring that the oil seal can be correctly installed in place and form an effective seal.

[0014] 3. For outer diameter inflatable oil seals, the original design creates a transitional or interference fit between the maximum outer diameter of the oil seal and the inner diameter of the oil reservoir. This requires a certain pressure to open the outer diameter, forming a channel, before gas can be injected into the shock absorber. If the inflation force is insufficient to break the outer diameter interference force, inflation becomes difficult. This patented two-stage outer diameter design, featuring a raised portion and a continuous solid portion, and the air channel, solves this problem.

[0015] In summary, the oil seal outer diameter structure of the present invention ensures the stability and reliability of the oil seal during assembly, improves the assembly efficiency of the shock absorber, and at the same time solves the problem of difficulty in outer diameter inflation for outer diameter inflatable oil seals. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the outer diameter structure of an oil seal in the prior art;

[0017] Figure 2 This is a schematic diagram of the structure in which the protrusion is arranged on the upper portion of the outer diameter of the oil seal in an embodiment of the utility model;

[0018] Figure 3 A top view of the structure in which the protrusion is arranged on the upper portion of the outer diameter of the oil seal;

[0019] Figure 4 This is a schematic diagram of the structure in which the protrusion is arranged in the middle of the outer diameter of the oil seal in the embodiment of the utility model;

[0020] Figure 5 This is a top view of the structure in which the protrusion is arranged in the middle of the outer diameter of the oil seal.

[0021] In the figure, 10, outer diameter static sealing area; 11, oil storage cylinder; 12, oil seal skeleton; 13, guide; 20, raised portion; 21, boss; 22, airway; 30, continuous solid portion; 40, cut corner. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1 To the attached Figure 5 The principles and features of the present invention are described, and the examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] like Figure 1 The figure shows the outer diameter structure of the oil seal in the prior art. To ensure the outer diameter sealing and realize the positioning of the oil seal, in the existing oil seal design, the maximum outer diameter of the oil seal and the inner diameter of the oil storage cylinder 11 are in transition or interference fit. The maximum outer diameter of the oil seal is a rubber entity with equal radius, forming a continuous contact surface with the inner diameter of the oil storage cylinder 11. However, during the assembly process, the oil seal is pressed down from the contact oil storage cylinder 11 to the contact guide 13. The process of pressing the oil seal down will compress the gas in the inner cavity of the sealed shock absorber, causing the internal pressure of the shock absorber to increase. In the assembly process without preload, excessive internal pressure of the shock absorber may lift the oil seal, causing the oil seal to climb up and abnormal assembly of the shock absorber. For outer diameter inflatable oil seals, unreasonable design of the oil seal outer diameter interference will cause inflation difficulties and affect the assembly of the shock absorber.

[0024] like Figures 2 to 5 As shown, the outer diameter structure of the oil seal of the utility model is shown, wherein Figure 2 and Figure 4 The outer diameter static sealing area 10 is visible. The outer diameter structure of the oil seal includes a raised portion 20 and a continuous solid portion 30, and the raised portion 20 and the continuous solid portion 30 are integrally formed. The raised portion 20 has an interference fit with the inner wall of the oil storage cylinder 11, which can realize the positioning of the oil seal and ensure that the outer diameter of the oil seal and the inner diameter of the oil storage cylinder 11 have good coaxiality; the continuous solid portion 30 has a clearance fit with the inner wall of the oil storage cylinder 11, and during the downward pressure of the oil seal, the gas in the shock absorber can leak from the outer diameter gap, ensuring that the oil seal can be correctly installed in place and form an effective seal. The annular static sealing rubber entity at the outer diameter of the oil seal is compressed in the space formed by the oil seal skeleton 12, the inner diameter of the oil storage cylinder 11 and the guide 13, ensuring the outer diameter seal.

[0025] The raised portion 20 and the continuous solid portion 30 are arranged in a continuous pattern, with different specific structures for different application scenarios. In one embodiment, the raised portion 20 is located at the upper portion of the oil seal outer diameter, meaning the oil seal outer diameter structure consists of two parts: the raised portion 20 and the continuous solid portion 30. In another embodiment, the raised portion 20 is located in the middle of the oil seal outer diameter, meaning the oil seal outer diameter structure consists of three parts: the raised portion 20, the continuous solid portion 30, and the uppermost transition portion. The raised portion 20 and the transition portion are connected by a cutaway angle 40, which is inclined toward the oil seal frame 12.

[0026] The raised portion 20 includes a plurality of bosses 21, which are evenly arranged around the axis of the oil seal. An air passage 22 is provided between two bosses 21 for gas circulation to avoid the problem of the oil seal climbing due to increased internal pressure of the shock absorber and affecting assembly.

[0027] Define the maximum outer diameter of the raised portion 20 as d1, the maximum outer diameter of the continuous solid portion 30 as d2, and the inner diameter of the oil reservoir 11 as d3. To ensure a good fit, in one embodiment, the dimensional relationship between d1 and d3 is preferably: d3 + 0.1 mm ≤ d1 ≤ d3 + 0.3 mm. In another embodiment, the dimensional relationship between d2 and d3 is preferably: d3 - 0.1 mm ≤ d2 ≤ d3 - 0.2 mm.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An oil seal outer diameter structure, characterized in that: The invention comprises a raised portion (20) and a continuous solid portion (30), wherein the raised portion (20) is interference-fitted with the inner wall of the oil storage cylinder (11), and the continuous solid portion (30) is clearance-fitted with the inner wall of the oil storage cylinder (11), and the raised portion (20) and the continuous solid portion (30) are integrally formed.

2. The oil seal outer diameter structure according to claim 1, characterized in that: The raised portion (20) includes a plurality of bosses (21), the bosses (21) are evenly arranged around the axis of the oil seal, and an air passage (22) is provided between two bosses (21) for gas circulation.

3. The oil seal outer diameter structure according to claim 1, characterized in that: The raised portion (20) and the continuous solid portion (30) are continuously arranged up and down, and the raised portion (20) is arranged on the upper portion of the outer diameter of the oil seal.

4. The oil seal outer diameter structure according to claim 1, characterized in that: The raised portion (20) and the continuous solid portion (30) are continuously arranged up and down, and the raised portion (20) is arranged in the middle of the outer diameter of the oil seal.

5. The oil seal outer diameter structure according to claim 1, characterized in that: The inner diameter of the oil storage cylinder (11) is d3, the maximum outer diameter of the protrusion (20) is d1, and d1 and d3 satisfy the following relationship: d3+0.1mm≤d1≤d3+0.3mm.

6. The oil seal outer diameter structure according to claim 1, characterized in that: The inner diameter of the oil storage cylinder (11) is d3, the maximum outer diameter of the continuous solid portion (30) is d2, and d2 and d3 satisfy the following relationship: d3-0.1mm≤d2≤d3-0.2mm.

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