Anti-falling air spring piston

Abstract

The utility model provides a kind of anti-drop air spring piston, it is related to air spring technical field, including piston body, the piston body is ladder-like cylinder structure, from top to bottom is divided into air bag connecting section, transition support section and installation connecting section in proper order, air passage is opened in the piston body inside along the axial direction, by the air passage port of installation connecting section side wall by outside inflation device, compressed air is delivered to air bag connecting section top end by air passage, fills into air bag and makes it swell, swelled air bag can buffer external vibration and impact, realize shock-absorbing function, when air bag is connected with air bag connecting section, first annular clamping groove is stuck air bag lip and forms basic fixed, annular protruding limit surface blocks lip and comes out upward, double anti-drop;Sealing gap in the second annular clamping groove, avoid air pressure leakage.Transition support section's reinforcing rib enhances force transmission stability, the external thread of installation connecting section fixes piston position, ensure overall collaborative work.

Description

Technical Field

[0001] This utility model relates to the field of air spring technology, and in particular to an anti-disengagement air spring piston. Background Technology

[0002] Air springs are widely used in automobiles, construction machinery and other fields due to their excellent shock absorption and cushioning performance.

[0003] However, existing air springs typically use a single slot or interference fit to connect the piston and air bladder. Under long-term vibration, frequent changes in air pressure, or extreme working conditions, the air bladder is prone to detaching from the piston connection, causing the air spring to fail. This not only affects the normal operation of the equipment but may also cause safety hazards. Therefore, an anti-detachment air spring piston is needed. Utility Model Content

[0004] The purpose of this invention is to provide an anti-detachment air spring piston, which solves the problem of air spring failure caused by airbag detachment in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an anti-detachment air spring piston, comprising a piston body, the piston body having a stepped cylindrical structure, which is divided into an airbag connecting section, a transition support section and an installation connecting section from top to bottom. An air passage is provided axially inside the piston body, one end of the air passage penetrating the top surface of the airbag connecting section and the other end penetrating the side wall of the installation connecting section. The outer side wall of the airbag connecting section is provided with a main locking part, an auxiliary anti-detachment part and a sealing reinforcement part. The sealing reinforcement part is a second annular groove surrounding a first annular groove below it. A sealing ring is adapted to be installed in the second annular groove. The outer side wall of the installation connecting section is provided with reinforcing ribs and external threads.

[0006] Preferably, the main locking part is a first annular groove that is opened around the piston, the first annular groove having a "U" shaped cross-section, and the auxiliary anti-disengagement part is an annular protrusion that is arranged around the first annular groove, the annular protrusion being integrally formed with the piston body.

[0007] Preferably, the top of the annular protrusion is provided with an inclined guide surface, and the bottom is provided with a limiting surface perpendicular to the piston axis. The distance between the limiting surface and the upper groove wall of the first annular groove is adapted to the thickness of the airbag lip.

[0008] Preferably, the reinforcing ribs are evenly distributed along the axial direction of the transition support section.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] Compressed air is supplied to the top of the airbag connecting section via an external inflation device through an air duct port on the side wall of the mounting connecting section. The airbag is then inflated, buffering external vibrations and impacts for shock absorption. When the airbag is connected to the airbag connecting section, the first annular groove engages the airbag lip to provide a basic fixation, while the annular protrusion prevents the lip from detaching upwards, providing double anti-detachment protection. The sealing ring within the second annular groove seals the gap, preventing air pressure leakage. Reinforcing ribs in the transition support section enhance stress transmission stability, and the external thread of the mounting connecting section fixes the piston position, ensuring coordinated overall operation. Attached Figure Description

[0011] Figure 1 This is a top view of the overall structure of the product of this utility model;

[0012] Figure 2 This is a schematic diagram of the overall front view of the product of this utility model;

[0013] Figure 3 This is a schematic cross-sectional view of the overall structure of the product of this utility model;

[0014] Figure 4 This is an enlarged structural diagram of section A of the product of this utility model.

[0015] In the figure: 1. Piston body; 2. Airbag connecting section; 3. Transition support section; 4. Mounting connection section; 5. Air passage; 6. First annular groove; 7. Annular protrusion; 8. Inclined guide surface; 9. Limiting surface; 10. Second annular groove; 11. Sealing ring; 12. Reinforcing rib; 13. External thread. Detailed Implementation

[0016] 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.

[0017] This utility model relates to an anti-disengagement air spring piston, such as... Figure 1-4 As shown, it includes a piston body 1, which is made of aluminum alloy or carbon steel and integrally cast. The overall structure is a stepped cylindrical structure with no splicing gaps to ensure overall strength. It is divided into three functional sections from top to bottom: the top section is the airbag connection section 2 with the largest diameter, the middle section is the transition support section 3 with a medium diameter, and the bottom section is the installation connection section 4 with the smallest diameter. The three sections are coaxial and integrally connected, forming a stepped force-bearing structure with a "thicker at the top and thinner at the bottom", which can smoothly transmit the pressure and vibration impact of the airbag.

[0018] Furthermore, the air passage 5 extends through the interior along the axial direction of the piston body 1. One end vertically penetrates the top surface of the airbag connecting section 2, which is the top of the piston body. The other end is bent radially at 90° and then penetrates the side wall of the installation connecting section 4. The air passage 5 is a hollow channel inside the piston body 1, integrally formed with the piston body 1, without any additional connecting parts. Its top port is directly connected to the inside of the airbag. After the airbag is installed, the side wall port is connected to an external inflation device, such as an air tank, through an air pipe connector. As a dedicated channel for compressed air, it enables airflow to be conducted, inflates the airbag, and maintains a stable air pressure. It is the core flow channel for the air spring to achieve the function of air pressure buffering and shock absorption.

[0019] Furthermore, the airbag connecting section 2 is the uppermost thick cylindrical section of the piston body 1, which is the core area directly connected to the airbag. Its outer wall is provided with an auxiliary anti-detachment part, a main snap-fit ​​part, and a sealing reinforcement part in sequence. All three are integrally formed with the airbag connecting section 2.

[0020] Among them, such as Figure 2 As shown, the main locking part includes a first annular locking groove 6, which is located in the middle area of ​​the outer wall of the airbag connecting section 2. It is an annular groove surrounding the side wall of the airbag connecting section 2, with a "U" shaped cross section. The groove width is adapted to the thickness of the annular protrusion on the "inner lip" of the airbag end. When the airbag is installed, the lip is precisely embedded in the groove and fits tightly with the upper and lower walls of the groove. Through the locking structure of the lip groove, the basic displacement of the airbag along the piston axis is restricted, forming the first anti-detachment fixation to prevent the airbag from falling off under normal working conditions.

[0021] Among them, such as Figure 2 As shown, the auxiliary anti-detachment part includes an annular protrusion 7, which is arranged around the top of the first annular groove 6 and integrally formed with the airbag connecting section 2. Its outer diameter is smaller than the maximum outer diameter of the airbag connecting section 2, which can avoid obstructing the airbag from being inserted. It is also larger than the bottom diameter of the first annular groove 6 and ensures that a limit is formed. The inclined guide surface 8 at the top contacts the inner inclined surface of the airbag lip, and the limiting surface 9 at the bottom is perpendicular to the piston axis and fits against the top surface of the airbag lip. The inclined guide surface 8 guides the airbag lip to slide smoothly into the first annular groove 6, reducing the installation difficulty. The limiting surface 9 cooperates with the upper groove wall of the first annular groove 6 to form an upper and lower clamping structure, preventing the airbag lip from coming off upwards. It is the second line of defense against detachment under extreme working conditions.

[0022] Furthermore, the sealing reinforcement includes a second annular groove 10 and a sealing ring 11. The second annular groove 10 is formed around the first annular groove 6 directly below it and is integrally molded with the airbag connecting section 2. The sealing ring 11 is an O-ring made of nitrile rubber, which is fitted into the second annular groove 10. The groove width and depth of the second annular groove 10 match the size of the sealing ring 11, limiting the radial displacement of the sealing ring 11. The outer diameter of the sealing ring 11 is slightly larger than the side wall diameter of the airbag connecting section 2. After the airbag is fitted, the sealing ring 11 is compressed and fits tightly against the inner side wall of the airbag. The sealing ring 11 fills the gap between the airbag and the piston, preventing the leakage of compressed air in the airbag. At the same time, the friction generated by the interference fit enhances the connection stability between the airbag and the piston and helps to prevent detachment.

[0023] Furthermore, the transition support section 3 is located directly below the airbag connecting section 2 and directly above the mounting connecting section 4, and the three are connected as a single unit. Three to six reinforcing ribs 12 are evenly distributed along the axial direction of the transition support section 3, and are integrally formed with the transition support section 3. The upper end face of the transition support section 3 is seamlessly connected to the lower end face of the airbag connecting section 2, and the lower end face is seamlessly connected to the upper end face of the mounting connecting section 4. The root of the reinforcing rib 12 is completely fitted to the outer wall of the transition support section 3, and the top is a smooth surface. The transition support section 3 alleviates stress concentration caused by the difference in diameter between the upper and lower sections, and smoothly transmits airbag pressure. The reinforcing rib 12 enhances the bending and torsional strength of the transition support section 3, preventing the piston from deforming or breaking during vibration.

[0024] Furthermore, the mounting connection section 4 is the thin cylindrical section at the bottom of the piston body 1, and its outer wall is machined with external threads 13. The external threads 13 are integrally machined with the mounting connection section 4 and are adapted to the internal threads of the air spring base or suspension components. The piston and external components are detachably fixed by thread engagement. The piston is fixed in the external system by the external threads 13 to ensure the stability of the piston position and avoid overall displacement due to vibration, thereby indirectly ensuring the reliability of the connection between the airbag and the piston.

[0025] In practical use: Compressed air is delivered to the top of the airbag connecting section 2 via the air passage 5 port on the side wall of the installation connecting section 4 through the external inflation device, inflating the airbag. The inflated airbag can buffer external vibrations and impacts, achieving shock absorption. When the airbag is connected to the airbag connecting section 2, the first annular groove 6 locks the airbag lip to form a basic fixation, and the limiting surface 9 of the annular protrusion 7 prevents the lip from coming off upwards, providing double anti-detachment; the sealing ring 11 in the second annular groove 10 seals the gap to prevent air pressure leakage. The reinforcing rib 12 of the transition support section 3 enhances the stability of force transmission, and the external thread 13 of the installation connecting section 4 fixes the piston position to ensure overall coordinated operation.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A type of anti-disengagement air spring piston, characterized in that: The piston body (1) is a stepped cylindrical structure, which is divided into an airbag connecting section (2), a transition support section (3) and an installation connecting section (4) from top to bottom. An air passage (5) is provided in the piston body (1) along the axial direction. One end of the air passage (5) passes through the top surface of the airbag connecting section (2) and the other end passes through the side wall of the installation connecting section (4). The outer side wall of the airbag connecting section (2) is provided with a main snap-fit ​​part, an auxiliary anti-detachment part and a sealing reinforcement part. The sealing reinforcement part is a second annular groove (10) that surrounds the first annular groove (6) below. A sealing ring (11) is adapted to be installed in the second annular groove (10). The outer side wall of the installation connecting section (4) is provided with a reinforcing rib (12) and an external thread (13).

2. The anti-disengagement air spring piston according to claim 1, characterized in that: The main locking part is a first annular groove (6) that is opened around the piston. The first annular groove (6) has a "U" shaped cross section. The auxiliary anti-disengagement part is an annular protrusion (7) that is arranged around the first annular groove (6). The annular protrusion (7) is integrally formed with the piston body (1).

3. The anti-disengagement air spring piston according to claim 2, characterized in that: The annular protrusion (7) has an inclined guide surface (8) at its top and a limiting surface (9) perpendicular to the piston axis at its bottom. The distance between the limiting surface (9) and the upper groove wall of the first annular groove (6) is adapted to the thickness of the airbag lip.

4. The anti-disengagement air spring piston according to claim 1, characterized in that: The reinforcing ribs (12) are evenly distributed along the axial direction of the transition support section (3).

Images