A guide structure of a rail transit shock absorber

Abstract

The utility model discloses a kind of guider structure of rail transit shock absorber, including piston rod, and the guider and self-lubricating bearing bush of being sleeved in the outside of piston rod, still including sealing cover, sealing cover is set in the top of guider and is sleeved in the outside of piston rod, guider connection sealing cover one end is provided with framework oil seal groove, the inside assembly of framework oil seal groove has corresponding size framework oil seal, the outside assembly of framework oil seal has sealing ring, guider connection work cylinder one end press fits self-lubricating bearing bush, guider is radially machined in the middle of framework oil seal and self-lubricating bearing bush and has ster seal groove, the inside assembly of ster seal groove has corresponding size ster seal;Guider upper end is provided with framework oil seal, lower end is provided with self-lubricating bearing bush, and ster seal is also provided between framework oil seal and self-lubricating bearing bush simultaneously, the sealing structure formed, both provide reliable sealing performance and durability, and can improve maintainability and reliability.

Description

Technical Field

[0001] This utility model relates to the field of vibration damper technology for rail transit, and in particular to a guide structure for a vibration damper for rail transit. Background Technology

[0002] Currently, with the iterative upgrade of my country's rail transit industry towards higher speeds and greater intelligence, the vehicle system is placing almost stringent demands on the long-term stability and adaptability of shock absorbers. Although domestically produced models, represented by the "Fuxing" high-speed train, have successfully joined the ranks of the world's advanced trains, there are still shortcomings in the research and development and industrialization of high-end shock absorbers, resulting in a long-term reliance on overseas suppliers for some key models. This external dependence on the supply chain not only restricts cost optimization and the efficiency of customized development, but also poses a potential challenge to the independent controllability of domestic vehicle manufacturing and after-sales maintenance.

[0003] As a core component ensuring the dynamic performance of rail vehicles, the technical level of vibration dampers directly determines the smoothness limits and safety redundancy of train operation. The operational stability and lifespan of the guide seal structure play a crucial role in the stability of vibration damper performance.

[0004] However, in the existing technology, the common sealing structure of hydraulic shock absorbers for rail transit has the following main defects: Insufficient sealing reliability: Single or simple sealing methods (such as a single oil seal) are prone to premature wear or failure under long-term high pressure and high-frequency impact, leading to hydraulic oil leakage. Leakage not only reduces damping force and affects comfort, but also pollutes the environment and may even cause safety hazards.

[0005] Poor durability: Hard particles (such as iron powder and dust) adhering to the piston rod surface will wear down the seals like sandpaper.

[0006] Low maintainability and adjustability: In traditional designs, threaded connections used to secure internal valve systems are often sealed with thread-locking adhesive. While this prevents leaks, the cured adhesive makes disassembly and maintenance extremely difficult, and adhesive debris can clog precision damping valves, affecting performance tuning.

[0007] Therefore, how to provide a guide structure for a rail transit vibration damper that can provide reliable sealing performance and durability, as well as improve maintainability and reliability, has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0008] This utility model proposes a guide structure for a rail transit vibration damper to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A guide structure for a rail transit vibration damper includes a piston rod, a guide sleeved on the outside of the piston rod, and a self-lubricating bearing bushing. It also includes a sealing cover, which is positioned above the guide and sleeved on the outside of the piston rod. A working cylinder is connected to the lower part of the guide. A skeleton oil seal groove is provided at one end of the guide connected to the sealing cover. A skeleton oil seal of a corresponding size is fitted inside the skeleton oil seal groove, and a sealing ring is fitted on the outside of the skeleton oil seal. A self-lubricating bearing bushing is press-fitted at one end of the guide connected to the working cylinder. A step seal groove is radially machined between the skeleton oil seal and the self-lubricating bearing bushing on the guide. A step seal of a corresponding size is fitted inside the step seal groove. An oil storage chamber is provided between the skeleton oil seal and the step seal on the guide. A liquid storage cylinder is provided on the outside of the guide. A second cavity is provided between the liquid storage cylinder and the working cylinder, and the second cavity is located at the lower end of the guide. Three return oil holes communicating with the second cavity are evenly distributed on the inner wall of the oil storage chamber.

[0010] Preferably, the sealing cover has a radially machined dustproof ring groove inside, and a dustproof ring of corresponding size is installed inside the dustproof ring groove.

[0011] Preferably, the depth of the groove of the skeleton oil seal is 15%-25% less than the thickness of the outer ring of the skeleton oil seal, so that when the guide and the sealing cover are tightly fitted, the sealing ring on the outside of the skeleton oil seal reaches the ideal sealing compression range.

[0012] Preferably, one end of the guide is interference-fitted to one end of the working cylinder, and the height is limited by the length of the working cylinder and the step on one end of the guide.

[0013] Preferably, the external thread of the sealing cap is connected to the internal thread of the liquid storage cylinder port and fits against the upper end face of the guide.

[0014] Preferably, the working cylinder, guide, step seal, skeleton oil seal, and sealing cover form a sealing structure.

[0015] Preferably, a star-shaped sealing ring is radially provided inside the guide and the liquid storage cylinder inlet.

[0016] The beneficial effects of this utility model are as follows: The guide structure of this rail transit vibration damper has a skeleton oil seal at the upper end and a self-lubricating bearing bushing at the lower end. A step seal is also installed between the skeleton oil seal and the self-lubricating bearing bushing. The sealing structure formed by the working cylinder, guide, step seal, skeleton oil seal and sealing cover provides reliable sealing performance and durability, and also improves maintainability and reliability. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the guide structure of a rail transit vibration damper according to the present invention.

[0018] The following are the labels in the diagram: 1. Guide; 2. Star-shaped seal; 3. Sealing cover; 4. Skeleton oil seal; 5. Piston rod; 6. Dust seal; 7. Liquid reservoir; 8. Step seal; 9. Self-lubricating bearing bushing; 10. Working cylinder; 11. Hydraulic oil; 60. Oil reservoir; 61. Second chamber. Detailed Implementation

[0019] 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.

[0020] Example 1 Reference Figure 1 As shown, a guide structure for a rail transit vibration damper includes a piston rod 5, a guide 1 sleeved on the outside of the piston rod 5, and a self-lubricating bearing bushing 9. It also includes a sealing cover 3, which is positioned above the guide 1 and sleeved on the outside of the piston rod 5. A working cylinder 10 is connected to the lower part of the guide 1. A skeleton oil seal groove is provided at one end of the guide 1 connected to the sealing cover 3. A skeleton oil seal 4 of corresponding size is fitted inside the skeleton oil seal groove, and a sealing ring is fitted on the outside of the skeleton oil seal 4. The guide 1 is connected to the working cylinder 10. One end is press-fitted with a self-lubricating bearing bushing 9. A step seal groove is radially machined between the skeleton oil seal 4 and the self-lubricating bearing bushing 9 in the guide 1. A step seal 8 of corresponding size is assembled inside the step seal groove. An oil storage chamber 60 is provided between the skeleton oil seal 4 and the step seal 8 in the guide 1. A liquid storage cylinder 7 is provided on the outside of the guide 1. A second cavity 61 is provided between the liquid storage cylinder 7 and the working cylinder 10, and the second cavity 61 is located at the lower end of the guide 1. Three oil return holes communicating with the second cavity 61 are evenly distributed on the inner wall of the oil storage chamber 60. The depth of the skeleton oil seal groove is 15%-25% less than the outer ring rubber coating thickness of the skeleton oil seal 4, so that when the guide 1 and the sealing cover 3 are tightly fitted, the sealing ring on the outside of the skeleton oil seal 4 reaches the ideal sealing compression range. One end of the bottom of the guide 1 is interference-fitted to one end of the working cylinder 10, and the height is limited by the length of the working cylinder 10 pipe and the step on one end of the guide 1. The external thread of the sealing cap 3 is connected to the internal thread of the liquid storage cylinder 7 and fits against the upper end face of the guide 1. The working cylinder 10, the guide 1, the step seal 8, the skeleton oil seal 4, and the sealing cap 3 form a sealing structure.

[0021] In this embodiment, during use, the guide 1 is fitted onto the piston rod 5, and a skeleton oil seal 4 is provided at the upper end of the guide 1; a self-lubricating bearing bushing 9 is provided at the lower end. A step seal 8 is also provided between the skeleton oil seal 4 and the self-lubricating bearing bushing 9. Therefore, when the damper is working, the piston rod 5 generates hydrodynamic pressure during its high-speed reciprocating motion, and hydraulic oil 11 is wedged into the contact area to form a pressure-bearing oil film, completely separating the piston rod 5 and the self-lubricating bearing bushing 9. This achieves a low-wear, long-life effect. During this process, the step seal 8 at the upper end of the self-lubricating bearing bushing 9 can withstand the impact of some high-pressure oil during the reciprocating motion of the piston rod 5; the higher the pressure, the better the sealing effect. While the step seal 8 provides pressure sealing, an oil storage chamber 60 and an oil return hole are provided between the step seal 8 and the skeleton oil seal 4, allowing the upper skeleton oil seal 4 to operate in a more suitable low-pressure sealing environment and preventing damage to the skeleton oil seal 4, thus providing a double-seal guarantee.

[0022] Example 2 Reference Figure 1 As shown, unlike Embodiment 1, a star-shaped sealing ring 2 is radially arranged inside the guide 1 and the reservoir 7. Through its multi-lip design, while maintaining the simplicity of the elastic seal, the hollow structure of the star-shaped sealing ring 2 allows the internal oil pressure to gently push the sealing lip in one direction towards the sealing surface like a wedge, greatly enhancing the sealing contact pressure. This structure improves upon existing technologies that often use thread-locking adhesive for sealing internal threaded connections.

[0023] Example 3 Reference Figure 1 As shown, unlike Embodiments 1 and 2, the sealing cover 3 has a dustproof ring groove machined radially inside, and a dustproof ring 6 of corresponding size is installed inside the dustproof ring groove. The dustproof ring 6 on the sealing cover 3 can prevent hard particles (such as iron powder and dust) adhering to the piston rod 5 exposed to the outside from abrading the sealing parts (such as skeleton oil seal 4, step seal 8, self-lubricating bearing bush 9) during the movement.

[0024] 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 guide structure for a rail transit vibration damper, comprising a piston rod (5), a guide (1) sleeved on the outside of the piston rod (5), and a self-lubricating bearing bushing (9), characterized in that, It also includes a sealing cap (3), which is positioned above the guide (1) and sleeved on the outside of the piston rod (5). A working cylinder (10) is connected to the bottom of the guide (1). A skeleton oil seal groove is provided at one end of the guide (1) connected to the sealing cap (3). A skeleton oil seal (4) of corresponding size is installed inside the skeleton oil seal groove. A sealing ring is installed on the outside of the skeleton oil seal (4). A self-lubricating bearing bushing (9) is press-fitted at one end of the guide (1) connected to the working cylinder (10). The guide (1) is located on the skeleton oil seal (4). A step seal groove is radially machined between the self-lubricating bearing bush (9), and a step seal (8) of corresponding size is assembled inside the step seal groove. An oil storage cavity (60) is provided between the skeleton oil seal (4) and the step seal (8) in the guide (1). A liquid storage cylinder (7) is provided on the outside of the guide (1). A second cavity (61) is provided between the liquid storage cylinder (7) and the working cylinder (10), and the second cavity (61) is located at the lower end of the guide (1). Three oil return holes communicating with the second cavity (61) are evenly distributed on the inner wall of the oil storage cavity (60).

2. The guide structure of the rail transit vibration damper according to claim 1, characterized in that, The sealing cap (3) has a dustproof ring groove machined radially inside, and a dustproof ring (6) of corresponding size is assembled inside the dustproof ring groove.

3. The guide structure of the rail transit vibration damper according to claim 1, characterized in that, The depth of the groove of the skeleton oil seal is 15%-25% less than the thickness of the outer ring of the skeleton oil seal (4), so that when the guide (1) and the sealing cover (3) are tightly fitted, the sealing ring on the outside of the skeleton oil seal (4) reaches the ideal sealing compression range.

4. The guide structure of the rail transit vibration damper according to claim 1, characterized in that, The bottom end of the guide (1) is interference-fitted to the end of the working cylinder (10), and the height is limited by the length of the working cylinder (10) and the plane step at one end of the guide (1).

5. The guide structure of the rail transit vibration damper according to claim 1, characterized in that, The external thread of the sealing cap (3) is connected to the internal thread of the liquid storage cylinder (7) and fits against the upper end face of the guide (1).

6. The guide structure of the rail transit vibration damper according to claim 1, characterized in that, The working cylinder (10), guide (1), step seal (8), skeleton oil seal (4) and sealing cover (3) form a sealing structure.

7. The guide structure of the rail transit vibration damper according to claim 1, characterized in that, A star-shaped sealing ring (2) is radially arranged inside the inlet of the guide (1) and the liquid storage cylinder (7).

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