Dust cover cap for shock absorber for protecting oil seal lip
By designing a raised section for the dust cover, the problem of increased costs associated with protecting the oil seal lip was solved, achieving both a good sealing effect and cost savings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LONGCHANG SHANCHUAN PRECISION WELDED TUBE CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-08
AI Technical Summary
In existing technologies, adding an oil seal guard plate or top cover to protect the oil seal lip during the sealing of the shock absorber leads to increased manufacturing and process costs.
Design a dust cover with a protrusion to prevent the dust cover from contacting the oil seal lip at the end of the oil reservoir. The dust cover is processed by stamping to reduce assembly steps and save costs.
It effectively protects the oil seal lip, prevents seal failure, reduces manufacturing costs, and uses the same processing technology as existing ones, without increasing costs.
Smart Images
Figure CN224214626U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive shock absorber technology, and more specifically, to a dust cover for shock absorbers that protects the oil seal lip. Background Technology
[0002] A dual-ring automotive shock absorber is a component used in automotive suspension systems. Its main function is to suppress the oscillations when the spring absorbs shock and the impact from the road surface, thereby improving the ride comfort of the vehicle.
[0003] Traditional double-ring structure automotive shock absorbers, such as Figure 1 As shown, it includes a piston rod and an oil reservoir that can slide relative to each other. In addition, a dust cover is designed to protect the piston rod from the corrosion of mud and rainwater. The part that fixes the dust cover is usually called the dust cover cover. The dust cover cover must not only fix the dust cover, but also ensure that the dust cover cover does not squeeze the oil seal lip when the shock absorber is compressed to the shortest limit stroke. To avoid this problem, the traditional design is to put an oil seal guard plate or add a top cover between the oil seal lip and the end of the oil reservoir when sealing the shock absorber to protect the oil seal lip and prevent the oil seal lip from being squeezed and causing the shock absorber to leak oil and fail. However, the processing and welding of the oil seal guard plate or top cover increases the parts and process costs of manufacturing the shock absorber. Therefore, it is necessary to design a special dust cover cover to achieve the purpose of protecting the oil seal lip and saving costs. Utility Model Content
[0004] This utility model provides a dust cover for a shock absorber that protects the oil seal lip, solving the technical problem in the prior art where an oil seal guard plate or a top cover is placed between the oil seal lip and the end of the oil reservoir to protect the oil seal lip during shock absorber sealing, which increases the parts and process costs of shock absorber manufacturing.
[0005] In view of the above problems, the technical solution proposed by this utility model is as follows:
[0006] A dust cover for a shock absorber that protects an oil seal lip includes a piston rod, an oil reservoir, and a dust cover. The oil reservoir is nested outside the piston rod, and the dust cover is nested outside the oil reservoir. One end of the dust cover is fixedly connected to a dust cover cap, and one end of the piston rod is fixedly connected to the inner wall of the dust cover cap. The oil reservoir has a double-layer structure consisting of an inner working chamber and an outer oil reservoir. An oil seal lip is provided at the end of the oil reservoir, and the dust cover cap has an outwardly protruding portion.
[0007] Furthermore, an oil seal is fixed to the inner side of the end of the oil reservoir, and the oil seal lip is part of the oil seal. The oil reservoir presses the oil seal by a flanged sealing opening, and after sealing, the sealing lip is higher than the plane of the oil reservoir.
[0008] Furthermore, a guide seat is provided at the end of the oil reservoir, and the guide seat fits into the outer wall of the piston rod.
[0009] Furthermore, the end edge of the oil reservoir and the inner wall edge of the dust cover are both rounded.
[0010] Furthermore, the shock absorber is provided with lifting rings on both sides, which are fixedly connected to the dust cover and the end position of the oil reservoir, respectively.
[0011] Furthermore, the dust cover and the dust cover cap are made of metal, and the outer surface of the dust cover and the dust cover cap is provided with an electroplated anti-corrosion layer.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: During use, when the shock absorber is compressed to its limit, the protrusions on the outside of the dust cover will form a certain safe distance between the oil reservoir and the dust cover, thereby preventing the dust cover from contacting the oil seal lip at the end of the oil reservoir and preventing the oil seal lip from being deformed by the dust cover and losing its sealing effect on the working chamber and the oil reservoir. The dust cover in this shock absorber is processed in the same way as the dust cover on the existing shock absorber, and is a stamped part. There is no increase in cost during the processing, and the assembly process of the shock absorber production process is effectively reduced, thereby effectively saving manufacturing costs. Attached Figure Description
[0013] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.
[0014] Figure 1 This is a schematic diagram of the existing technology;
[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model;
[0016] Figure 3 This is a schematic diagram of the external structure of the present utility model;
[0017] Figure 4 This is a cross-sectional structural diagram of the dust cover in this utility model.
[0018] In the diagram: 1. Piston rod; 2. Oil reservoir; 3. Dust cover; 4. Dust cover cover; 5. Working chamber; 6. Oil reservoir; 7. Oil seal lip; 8. Protrusion; 9. Oil seal; 10. Guide seat; 11. Lifting ring; 1a. Oil seal guard plate; 2a. Top cover. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0020] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.
[0021] Please see Figure 2-4 A dust cover for a shock absorber to protect the oil seal lip includes a piston rod 1, an oil reservoir 2, and a dust cover 3. The oil reservoir 2 is nested outside the piston rod 1, and the dust cover 3 is nested outside the oil reservoir 2. One end of the dust cover 3 is fixedly connected to a dust cover cap 4, which seals the end of the dust cover 3, creating a sealed structure inside the dust cover 3. This effectively prevents external mud, sand, and rainwater from entering the dust cover 3 and contaminating the piston rod 1. One end of the piston rod 1 is fixedly connected to the inner wall of the dust cover cap 4. When the shock absorber is subjected to vibration, the oil reservoir 2 slides axially between itself, the piston rod 1, and the dust cover 3. The oil reservoir 2 consists of an inner working chamber 5 and an outer oil storage chamber. The structure consists of two layers. The end of the oil reservoir 2 is provided with an oil seal lip 7, which is fitted between the end joint of the oil reservoir 2 and the piston rod 1 to seal the working chamber 5 and the oil reservoir 6, thereby preventing the oil in the working chamber 5 and the oil reservoir 6 from leaking through the end joint. The dust cover 4 is provided with a protrusion 8, which protrudes outward from the dust cover 4. When the oil reservoir 2 slides axially with the piston rod 1 and the dust cover 3, the end of the oil reservoir 2 will abut against the dust cover 4 at the end of the piston rod 1. At this time, the protrusion 8 protruding outward from the dust cover 4 will form a certain safe distance between the oil reservoir 2 and the dust cover 4, thereby preventing the dust cover 4 from contacting the oil seal lip 7 at the end of the oil reservoir 2.
[0022] During use, when the shock absorber is subjected to vibration, the oil reservoir 2 will slide axially relative to the piston rod 1 and the dust cover 3, causing the shock absorber to continuously extend and retract. During this process, the piston rod 1 will continuously press in or pull out of the oil reservoir 2, allowing the oil to flow back and forth between the working chamber 5 and the oil reservoir 6. The oil is damped by the piston valve at the bottom of the piston rod 1 and the bottom valve at the bottom of the oil reservoir 2, thus continuously reducing the relative movement between the piston rod 1 and the oil reservoir 2, thereby achieving vibration damping. The oil seal lip 7 at the end of the oil reservoir 2 can seal the end of the oil reservoir 2, preventing oil leakage from the working chamber 5 and the oil reservoir 6. When the shock absorber is compressed to its limit, the end of the oil reservoir 2 will contact the end of the piston rod 1... The dust covers 4 of the two parts are in contact with each other. At this time, the protrusion 8 protruding outward from the dust cover 4 will form a certain safe distance between the oil reservoir 2 and the dust cover 4, thereby avoiding contact between the dust cover 4 and the oil seal lip 7 at the end of the oil reservoir 2. This prevents the oil seal lip 7 from being squeezed and deformed by the dust cover 4, thus causing it to lose its sealing effect on the working chamber 5 and the oil reservoir 6. Since this structure does not require an oil seal guard plate or top cover to be set at the end of the oil reservoir 2, the protrusion 8 on the dust cover 4 can prevent the oil seal lip 7 from contacting the dust cover 4. The dust cover 4 in this shock absorber has the same processing technology as the dust cover 4 on the existing shock absorber. They are all stamped parts, so there is no increase in cost during the processing. It also effectively reduces the assembly process in the production process of the shock absorber, thereby effectively saving manufacturing costs.
[0023] For further details, please refer to Figure 2-4 An oil seal 9 is fixedly connected to the inner side of the end of the oil reservoir 2. The oil seal lip 7 is part of the oil seal 9. The oil reservoir 2 presses the oil seal 9 with the flanged seal. After sealing, the sealing lip 7 is higher than the plane of the oil reservoir 2. During the manufacturing process, it is convenient to assemble the oil seal lip 7 so that the oil seal lip 7 can be fixed at the end position of the oil reservoir 2.
[0024] For further details, please refer to Figure 2-4 The end of the oil reservoir 2 is also provided with a guide seat 10, which fits into the outer wall of the piston rod 1. The guide seat 10 can guide the sliding of the piston rod 1, so that the piston rod 1 can be stably kept in axial sliding with the oil reservoir 2, and avoid the piston rod 1 and the oil reservoir 2 from being misaligned during the sliding process.
[0025] For further details, please refer to Figure 2-4 The end edge of the oil reservoir 2 and the inner wall edge of the dust cover 4 are both rounded. When the oil reservoir 2 and the dust cover 4 come into contact, the fit of the edge contact position of the two can be increased, thereby reducing the wear between the two.
[0026] For further details, please refer to Figure 2-4 The shock absorber has hanging rings 11 on both sides. The hanging rings 11 are fixedly connected to the ends of the dust cover 4 and the oil reservoir 2, respectively. The shock absorber can be fixedly hung in the suspension system of the car through the hanging rings 11.
[0027] Furthermore, the dust cover 3 and dust cover 4 are made of metal, which has high strength and is lightweight, making them less prone to deformation under external forces. The outer surfaces of the dust cover 3 and dust cover 4 are provided with an electroplated anti-corrosion layer, making them less prone to rusting in the external environment. This provides long-term sealing protection for the inner piston rod 1 and oil reservoir 2.
[0028] In the embodiments provided in this application, it should be understood that the disclosed systems, modules, and methods can be implemented in other ways. For example, the module embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules or units, and may be electrical, mechanical, or other forms.
[0029] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.
Claims
1. A dust cover for a shock absorber that protects the oil seal lip, comprising a piston rod (1), an oil reservoir (2), and a dust cover (3), characterized in that, The oil reservoir (2) is nested on the outside of the piston rod (1), and the dust cover (3) is nested on the outside of the oil reservoir (2). One end of the dust cover (3) is fixedly connected to the dust cover cover (4). One end of the piston rod (1) is fixedly connected to the inner wall of the dust cover cover (4). The oil reservoir (2) consists of a working chamber (5) located on the inner side and an oil reservoir chamber (6) located on the outer side, forming a double-layer structure. The end of the oil reservoir (2) is provided with an oil seal lip (7), and the dust cover cover (4) is provided with a protrusion (8) protruding outward.
2. The dust cover for a shock absorber that protects the oil seal lip according to claim 1, characterized in that, An oil seal (9) is fixed to the inner side of the end of the oil storage cylinder (2). The oil seal lip (7) is part of the oil seal (9). The oil storage cylinder (2) presses the oil seal (9) by the flange sealing opening. After sealing, the sealing lip (7) is higher than the plane of the oil storage cylinder (2).
3. The dust cover for a shock absorber that protects the oil seal lip according to claim 1, characterized in that, The end of the oil reservoir (2) is also provided with a guide seat (10), which fits into the outer wall of the piston rod (1).
4. The dust cover for a shock absorber protecting the oil seal lip according to claim 1, characterized in that, The end edge of the oil storage cylinder (2) and the inner wall edge of the dust cover (4) are both rounded.
5. The dust cover for a shock absorber protecting the oil seal lip according to claim 1, characterized in that, The shock absorber is provided with lifting rings (11) on both sides, and the lifting rings (11) are fixedly connected to the dust cover (4) and the end position of the oil reservoir (2), respectively.
6. The dust cover for a shock absorber protecting the oil seal lip according to claim 1, characterized in that, The dust cover (3) and the dust cover cap (4) are made of metal, and the outer surfaces of the dust cover (3) and the dust cover cap (4) are provided with an electroplated anti-corrosion layer.