A hollow circular tube with a detachable damping seat tube structure for preventing rotation of a piston rod

Abstract

This utility model provides a hollow round tube with a detachable shock-absorbing seat tube structure for preventing piston rod rotation, belonging to the technical field of mechanical engineering. It includes an inner piston sleeve, an oil seal, an inner piston hexagonal tube, a locking cap, and a retaining ring. This utility model achieves tool-free quick assembly and disassembly and reliable anti-rotation by employing a rotating snap-fit ​​structure between the outer tube's L-shaped groove and the inner piston sleeve's lug. The progressive clamping mechanism formed by the locking cap and retaining ring ensures assembly stability and significantly improves fault tolerance. The bidirectional sealing design of the oil seal completely eliminates reliance on telescopic rubber sleeves, significantly improving waterproof performance and aesthetics. The combination of the inner piston hexagonal tube and the hexagonal hollow section ensures guiding accuracy while avoiding the high cost of custom-made tubing. The selection of standardized hollow round tubes combined with modular assembly technology optimizes costs while ensuring performance. This solves the problems of difficult assembly, high maintenance costs, and frequent replacement of vulnerable parts inherent in traditional solutions.

Description

Technical Field

[0001] This utility model belongs to the technical field of mechanical engineering, specifically relating to a shock-absorbing seat tube structure for a hollow round tube with a detachable piston rod that prevents rotation. Background Technology

[0002] Currently, most shock absorber seat tubes on the market employ a rigid extrusion fixing structure between an inner sliding component and an outer round tube, achieving sliding functionality through a clearance fit between the piston tube and the inner sliding component. While this traditional structure achieves basic shock absorption, it has significant shortcomings in assembly processes, structural stability, waterproofing, and maintainability. Meanwhile, some high-end products utilize a special design with an outer round and inner octagonal tube to address rotation issues, but this faces industrialization challenges such as high customized production costs and stringent processing precision requirements.

[0003] Existing extrusion-fixed structure assembly processes rely on specialized tools and have a low tolerance for error; mistakes can render the entire assembly unusable. Rigid connections pose a risk of structural failure, and waterproofing depends on easily damaged expansion sleeves, which are both aesthetically unappealing and prone to circumferential displacement. Once worn, the entire assembly must be replaced, resulting in high maintenance costs. While the solution using outer-circular and inner-octagonal tubing solves the rotation problem, it requires custom-made tubing with special cross-sections and high-precision machining of external threads, leading to a sharp increase in unit cost. This makes it difficult to meet the needs of the mass market and severely restricts the widespread application of this technology. Utility Model Content

[0004] The purpose of this utility model is to provide a shock-absorbing seat tube structure for a hollow round tube with a detachable piston rod that prevents rotation, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A hollow cylindrical tube with a detachable, anti-rotation shock-absorbing seat tube structure for the piston rod includes an inner piston sleeve, an oil seal, an inner piston hexagonal tube, a locking cap, a retaining ring, an upper piston sleeve, an outer tube, a spring, and a bottom support tube. The upper inner side of the outer tube has an L-shaped groove. The upper outer side of the inner piston sleeve has a lug and a threaded structure that mates with the inner wall of the outer tube. The interior of the inner piston sleeve consists of a circular hollow section and a hexagonal hollow section from top to bottom. The inner piston hexagonal tube slides within the hexagonal hollow section of the inner piston sleeve. The retaining ring is positioned above the threaded structure of the inner piston sleeve. The locking cap is screwed onto the threaded structure of the inner piston sleeve and presses against the retaining ring. The oil seal is embedded in a groove at the top of the locking cap. The spring is positioned between the inner piston hexagonal tube and the outer tube. The bottom support tube is fixed to the bottom of the outer tube.

[0006] As a preferred embodiment of this utility model, the lug of the inner piston sleeve extends radially outward and forms a rotating engagement with the L-shaped groove at the upper end of the outer tube, with the lug located below the retaining ring.

[0007] In a preferred embodiment of this utility model, the flared end of the inner piston hexagonal tube is positioned downwards and contacts the upper end face of the spring. The upper end of the inner piston hexagonal tube passes through the circular hollow section of the inner piston sliding sleeve and extends into the upper piston sleeve.

[0008] In a preferred embodiment of this utility model, the inner lug of the retaining ring forms an axial limiting fit with the L-shaped groove of the outer tube, and the lower end face of the retaining ring abuts against the upper end face of the lug of the inner piston sleeve.

[0009] As a preferred embodiment of this utility model, the trapezoidal pressing surface of the locking cover is located in the lower part of its inner cavity, forming an axial pressing fit with the upper end face of the retaining ring.

[0010] In a preferred embodiment of this utility model, the inner edge of the oil seal forms a sliding seal with the outer wall of the upper piston sleeve, and the outer edge of the oil seal forms a fixed seal with the groove of the locking cap.

[0011] In a preferred embodiment of this utility model, the lower end of the spring abuts against the upper end face of the bottom support tube, and the upper end of the spring abuts against the inner wall of the flared opening of the inner piston hexagonal tube.

[0012] Compared with existing technologies, the advantages of this utility model are as follows: By adopting a rotating snap-fit ​​structure of an outer tube L-shaped groove and an inner piston sliding sleeve lug, tool-free quick assembly and disassembly and reliable anti-rotation are achieved. The progressive clamping mechanism formed by the locking cap and the retaining ring ensures assembly stability and significantly improves the fault tolerance rate. The bidirectional sealing design of the oil seal completely eliminates the dependence on the telescopic rubber sleeve, significantly improving waterproof performance and aesthetics. The cooperation between the inner piston hexagonal tube and the hexagonal hollow section ensures guiding accuracy while avoiding the high cost of customized tubes. The selection of standardized hollow round tubes combined with modular assembly technology enables the product to achieve cost optimization while ensuring performance. It solves the problems of difficult assembly, high maintenance costs, and frequent replacement of vulnerable parts in traditional solutions. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial exploded view of the overall structure of this utility model; Figure 3This is an exploded schematic diagram of the inner piston sliding sleeve structure of this utility model; Figure 4 This is a cross-sectional view of the overall structure of this utility model; Figure 5 This is a cross-sectional view of the inner piston sliding sleeve structure of this utility model.

[0014] In the diagram: 1. Inner piston sleeve; 2. Oil seal; 3. Inner piston hexagonal tube; 4. Locking cap; 5. Snap ring; 6. Upper piston sleeve; 7. Outer tube; 8. Spring; 9. Bottom support tube. Detailed Implementation

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0017] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0018] Example Reference Figures 1-5 This embodiment of the present invention provides a hollow round tube with a detachable shock-absorbing seat tube structure for preventing piston rod rotation. It includes an inner piston sleeve 1, an oil seal 2, an inner piston hexagonal tube 3, a locking cap 4, a retaining ring 5, an upper piston sleeve 6, an outer tube 7, a spring 8, and a bottom support tube 9. An L-shaped groove is provided on the inner side of the upper end of the outer tube 7. The upper outer side of the inner piston sleeve 1 has lugs and a threaded structure that mate with the inner wall of the outer tube 7. The inner piston sleeve 1 has, from top to bottom, a circular hollow section and a hexagonal hollow section. The inner piston hexagonal tube 3 slides within the hexagonal hollow section of the inner piston sleeve 1. The retaining ring 5 is located above the threaded structure of the inner piston sleeve 1. The locking cap 4 is screwed onto the threaded structure of the inner piston sleeve 1 and presses against the retaining ring 5. The oil seal 2 is embedded in the top groove of the locking cap 4. The spring 8 is located between the inner piston hexagonal tube 3 and the outer tube 7. The bottom support tube 9 is fixed to the bottom of the outer tube 7.

[0019] The design utilizes a standard hollow round tube as the main body of the outer tube 7, along with a specially designed L-shaped groove structure, enabling low-cost manufacturing of the shock-absorbing seat tube. The nested design of the inner piston sliding sleeve 1 and the inner piston hexagonal tube 3 ensures smooth piston movement and effectively prevents rotation problems. The coordinated fixing mechanism of the locking cap 4 and the retaining ring 5 ensures the stability of the overall structure, while the oil seal 2 enhances waterproof performance. This modular design not only simplifies the assembly process but also significantly lowers the technical threshold for production.

[0020] Specifically, the lug of the inner piston sleeve 1 extends radially outward and forms a rotating engagement with the L-shaped groove at the upper end of the outer tube 7. The lug is located below the retaining ring 5.

[0021] The lug and L-shaped groove of the inner piston sleeve 1 have a dual advantage. On the one hand, it achieves reliable axial positioning and ensures assembly accuracy. On the other hand, it forms a mechanical lock through rotation and snap-fit, which effectively solves the problem of circumferential loosening that is easy to occur in traditional structures. It not only ensures the stability of the force, but also facilitates disassembly and maintenance, and improves the service life and reliability of the product.

[0022] Furthermore, the flared end of the inner piston hexagonal tube 3 is positioned downwards and contacts the upper end face of the spring 8. The upper end of the inner piston hexagonal tube 3 passes through the circular hollow section of the inner piston sliding sleeve 1 and extends into the upper piston sleeve 6.

[0023] Among them, the inner piston hexagonal tube 3 adopts a bottom-mounted flared design, which not only optimizes the contact area and stress distribution with the spring 8, but also ensures the linearity of piston movement through a unique hexagonal guide structure. The matching design of the upper piston sleeve 6 and the circular hollow section not only ensures the assembly accuracy, but also provides reliable guide support for the piston system, improving the stability and durability of the shock absorption process.

[0024] Preferably, the inner lug of the retaining ring 5 forms an axial limiting fit with the L-shaped groove of the outer tube 7, and the lower end face of the retaining ring 5 abuts against the upper end face of the lug of the inner piston sleeve 1.

[0025] Among them, the dual positioning design of the retaining ring 5 is highly innovative. The cooperation between its inner lug and the L-shaped groove forms the first mechanical stop, while the tight fit between the lower end face and the lug of the inner piston sleeve 1 constitutes the second axial limit. This dual protection mechanism effectively prevents structural loosening that may occur during use, improves the safety and reliability of the product, and maintains the convenience of disassembly and maintenance.

[0026] Furthermore, the trapezoidal pressing surface of the locking cover 4 is located in the lower part of its inner cavity, forming an axial pressing fit with the upper end face of the retaining ring 5.

[0027] Among them, the locking cover 4 adopts a design scheme that combines threaded connection and trapezoidal pressing surface. It achieves multi-dimensional fixation of the retaining ring 5 through progressive pressing. This composite fixing method not only ensures the firmness of the assembly, but also automatically compensates for possible gap changes during use, so that the overall structure always maintains the best working condition and extends the service life of the product.

[0028] Furthermore, the inner edge of the oil seal 2 forms a sliding seal with the outer wall of the upper piston sleeve 6, the outer edge of the oil seal 2 forms a fixed seal with the groove of the locking cover 4, the lower end of the spring 8 abuts against the upper end face of the bottom support tube 9, and the upper end of the spring 8 abuts against the inner wall of the bell mouth of the inner piston hexagonal tube 3.

[0029] Among them, the oil seal 2 adopts a unique two-way sealing design. Its inner edge forms a dynamic seal with the upper piston sleeve 6, and its outer edge forms a static seal with the locking cover 4. This dual sealing mechanism effectively blocks the intrusion of external moisture and dust, while not affecting the normal movement of the piston. It fundamentally solves the common problem of insufficient waterproof performance of traditional shock absorber seat tubes, and greatly improves the reliability of the product in harsh environments. The contact surface design of the spring 8 and the bottom support tube 9, as well as the matching structure of the inner wall of the flared mouth, together constitute an optimized force transmission path. This not only ensures the uniform distribution of shock absorption force, but also effectively avoids local stress concentration, greatly improving the stability and consistency of the shock absorption effect, while reducing noise and vibration, bringing users a more comfortable riding experience.

[0030] In use, firstly, the inner piston sleeve 1 is initially positioned by rotating and engaging the outer lug with the L-shaped groove at the upper end of the outer tube 7. Then, the lower end of the inner piston hexagonal tube 3 is inserted into the hexagonal hollow section of the inner piston sleeve 1 with the flared end facing down. Next, the inner lug of the retaining ring 5 is aligned with the L-shaped groove of the outer tube 7 and installed in place, so that its lower end face is in close contact with the upper end face of the lug of the inner piston sleeve 1. Then, the locking cover 4 is screwed in and the retaining ring 5 is progressively tightened by its trapezoidal pressing surface. Finally, the oil seal 2 is embedded in the groove at the top of the locking cover 4, and the spring 8 is installed between the inner piston hexagonal tube 3 and the outer tube 7, with its lower end in contact with the bottom support tube 9.

[0031] In summary, the L-shaped groove of the outer tube 7 and the rotating snap-fit ​​design of the lug of the inner piston sleeve 1 ensure both axial positioning accuracy and reliable circumferential anti-rotation function. The hexagonal guide structure and flared design of the inner piston hexagonal tube 3 work together to improve the linearity of the damping motion and the efficiency of force transmission. The double locking mechanism formed by the retaining ring 5 and the locking cover 4 achieves a balance between assembly stability and maintenance convenience. The bidirectional sealing system of the oil seal 2 improves waterproof and dustproof performance. The special matching structure of the spring 8 and the bottom support tube 9 optimizes the uniformity of the damping force distribution. While ensuring stable and reliable damping performance, it reduces manufacturing costs and assembly difficulty, making the product have excellent durability, environmental adaptability and user comfort.

[0032] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0033] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0034] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hollow circular tube with a detachable piston rod for preventing rotation, characterized in that: The system includes an inner piston sleeve (1), an oil seal (2), an inner piston hexagonal tube (3), a locking cap (4), a retaining ring (5), an upper piston sleeve (6), an outer tube (7), a spring (8), and a bottom support tube (9). The upper inner side of the outer tube (7) has an L-shaped groove. The upper outer side of the inner piston sleeve (1) has lugs and threads that mate with the inner wall of the outer tube (7). The interior of the inner piston sleeve (1) consists of a circular hollow section and a hexagonal hollow section from top to bottom. The hexagonal tube (3) is slidably fitted into the hexagonal hollow section of the inner piston sleeve (1). The retaining ring (5) is located above the threaded structure of the inner piston sleeve (1). The locking cap (4) is screwed onto the threaded structure of the inner piston sleeve (1) and presses the retaining ring (5). The oil seal (2) is embedded in the top groove of the locking cap (4). The spring (8) is located between the inner piston hexagonal tube (3) and the outer tube (7). The bottom support tube (9) is fixed to the bottom of the outer tube (7).

2. The shock-absorbing seat structure of a hollow circular tube with a detachable piston rod for preventing rotation, as described in claim 1, is characterized in that: The lug of the inner piston sleeve (1) extends radially outward and forms a rotating engagement with the L-shaped groove at the upper end of the outer tube (7). The lug is located below the retaining ring (5).

3. The shock-absorbing seat structure of a hollow circular tube with a detachable piston rod for preventing rotation, as described in claim 2, is characterized in that: The flared end of the inner piston hexagonal tube (3) is set downwards and contacts the upper end face of the spring (8). The upper end of the inner piston hexagonal tube (3) passes through the circular hollow section of the inner piston sliding sleeve (1) and extends into the upper piston sleeve (6).

4. The shock-absorbing seat structure of a hollow circular tube with a detachable piston rod for preventing rotation, as described in claim 3, is characterized in that: The inner lug of the retaining ring (5) forms an axial limiting fit with the L-shaped groove of the outer tube (7), and the lower end face of the retaining ring (5) abuts against the upper end face of the lug of the inner piston sleeve (1).

5. The shock-absorbing seat structure of a hollow circular tube with a detachable piston rod for preventing rotation, as described in claim 4, is characterized in that: The trapezoidal pressing surface of the locking cover (4) is located in the lower part of its inner cavity, forming an axial pressing fit with the upper end face of the retaining ring (5).

6. The shock-absorbing seat structure of a hollow circular tube with a detachable piston rod for preventing rotation, as described in claim 5, is characterized in that: The inner edge of the oil seal (2) forms a sliding seal with the outer wall of the upper piston sleeve (6), and the outer edge of the oil seal (2) forms a fixed seal with the groove of the locking cover (4).

7. The shock-absorbing seat structure of a hollow circular tube with a detachable piston rod for preventing rotation, as described in claim 6, is characterized in that: The lower end of the spring (8) abuts against the upper end face of the bottom support tube (9), and the upper end of the spring (8) abuts against the inner wall of the bell mouth of the inner piston hexagonal tube (3).

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