Improved membrane type air spring piston structure

Abstract

The invention belongs to the technical field of air springs, and particularly relates to an improved membrane type air spring piston structure which comprises a piston, a cover plate opposite to the piston and a bag skin connected between the piston and the cover plate in a sealed mode. A limiting inner cylinder is arranged on the surface, opposite to the piston, of the cover plate, an opening of the limiting inner cylinder is axially opposite to a buffer block connected with the top end of the piston, and when the bag skin is in a contraction state, the buffer block is axially inserted into the limiting inner cylinder so as to limit radial movement of the buffer block. The piston and the limiting inner cylinder matched with the piston are axially arranged between the piston and the cover plate which are opposite to each other, so that when the air spring is in a compressed state, the piston can extend into the limiting inner cylinder, radial movement of the piston is limited through the limiting inner cylinder, and friction of the capsule skin is effectively prevented.

Description

Technical Field

[0001] This invention belongs to the field of air spring technology, specifically relating to an improved diaphragm air spring piston structure. Background Technology

[0002] The diaphragm air spring piston is the core component of the diaphragm air spring, which is one of the core types of air springs. It uses a rubber diaphragm, a rigid piston, and a cover plate as its core structure. It utilizes the compressibility of gas to achieve elastic support and vibration damping. Due to its linear stiffness, compact structure, and high comfort, it is widely used in automobiles, precision equipment, industrial machinery and other fields, and is a key component of modern vibration damping technology.

[0003] Currently, the piston and cover plate of a diaphragm air spring are generally connected by vulcanization through a rubber diaphragm. Therefore, when the diaphragm air spring contracts, its rubber diaphragm contracts and is squeezed together. When subjected to radial external force, friction will occur between the compressed rubber diaphragms, resulting in wear and reducing its service life.

[0004] In view of this, the present invention provides an improved diaphragm air spring piston structure to solve the above problems. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: an improved diaphragm air spring piston structure, comprising: a piston, a cover plate opposite to the piston, and a bladder that is sealed between the piston and the cover plate;

[0006] The cover plate is provided with a limiting inner cylinder on the surface of the piston. The opening of the limiting inner cylinder is axially connected to the buffer block at the top of the piston, so that when the bladder is in a contracted state, the buffer block is axially inserted into the limiting inner cylinder to restrict the radial movement of the buffer block.

[0007] As a preferred embodiment of the improved diaphragm air spring piston structure of the present invention, the piston has an integrally formed limiting outer cylinder surrounding the bladder.

[0008] As a preferred embodiment of the improved diaphragm air spring piston structure of the present invention, the radial dimension of the limiting outer cylinder gradually increases relative to the axial dimension of the piston.

[0009] As a preferred embodiment of the improved diaphragm air spring piston structure of the present invention, a compression disc adapted to the top of the piston is provided between the piston and the buffer block connected to its top. The compression disc is used to press against the bladder end connected to the top surface of the piston.

[0010] As a preferred embodiment of the improved diaphragm air spring piston structure of the present invention, the top of the piston has a continuous bending surface, and the outer periphery of the extrusion disc meshes with the continuous bending surface.

[0011] As a preferred embodiment of the improved diaphragm air spring piston structure of the present invention, the bottom end of the extrusion disc is provided with an assembly stud protruding from the bottom of the piston, and the assembly stud is fitted with a connecting nut to allow the extrusion disc to be installed on the top of the piston.

[0012] As a preferred embodiment of the improved diaphragm air spring piston structure of the present invention, the assembly stud is an air passage stud, the end of which is connected tangentially to the cavity formed between the piston and the limiting outer cylinder through at least one set of electrically controlled valves and connecting pipes.

[0013] As a preferred embodiment of the improved diaphragm air spring piston structure of the present invention, the outer edge of the cover plate is rolled inward to form a bent portion, and the bladder skin is vulcanized and rolled along the curling path of the bent portion and connected inside the bent portion.

[0014] As a preferred embodiment of the improved diaphragm air spring piston structure of the present invention, the bottom surface of the cover plate has a protrusion relative to the end of the bent portion, the protrusion being used to reduce the bevel size of the bent portion.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The present invention provides a limiting inner cylinder that axially connects the piston and the cover plate, so that when the air spring is compressed, the piston can extend into the limiting inner cylinder to restrict the radial movement of the piston, thereby effectively preventing friction of the bladder skin.

[0017] This invention provides a limiting outer cylinder that surrounds the bladder on the outer periphery of the piston. On the one hand, when the air spring is in a compressed state, both the cover plate and the bladder can be housed in the cavity formed between the limiting outer cylinder and the piston, providing a certain degree of protection and dust prevention. On the other hand, when the air spring is in a semi-compressed state, it can support the radially expanding bladder, thereby improving radial support.

[0018] This invention provides an air passage stud at the bottom of the extrusion disc and uses an electronically controlled valve and connecting pipe to the cavity formed between the piston and the limiting outer cylinder in a tangential direction. This allows the high-pressure gas that is filled or discharged inside the bladder to purge the cavity when the bladder is pressurized or depressurized, preventing dust and other debris from accumulating in the cavity. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the connection structure between the extrusion disc and the piston of the present invention;

[0022] Figure 3 This is a schematic diagram of the connection structure between the limiting outer cylinder and the piston of the present invention;

[0023] Figure 4 This is a schematic diagram of the cover plate structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the extrusion disc connected to the limiting outer cylinder of the present invention.

[0025] In the diagram: 1. Piston; 111. Buffer block; 112. Extrusion disc; 1121. Assembly stud one; 113. Electrically controlled valve; 114. Connecting pipe; 12. Positioning hole; 13. Continuous bending surface; 14. Limiting outer cylinder; 15. Assembly groove; 2. Cover plate; 21. Limiting inner cylinder; 22. Bending part; 23. Protrusion; 24. Assembly stud two; 25. Air passage stud two; 3. Blade. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1:

[0028] This invention relates to an improved diaphragm air spring piston structure, such as... Figures 1-4 As shown, it includes: a piston 1, a cover plate 2 opposite to the piston 1, and a bladder 3 that is sealed between the piston 1 and the cover plate 2.

[0029] The piston 1 is cylindrical in shape, with an assembly groove 15 at the bottom for mounting and fixing. Its top has a truncated cone-shaped notch, into which the end of the bladder 3 is vulcanized to form a seal. A rubber buffer block 111 is also axially installed at this notch. This buffer block 111 separates the piston 1 from the cover plate 2 when the air spring is compressed, achieving soft contact.

[0030] like Figure 4As shown, the cover plate 2 is circular in shape, with its outer edge rolled inward to form a bend 22. The bladder skin 3 is vulcanized and rolled along the rolling path of the bend 22 to connect with the inside of the bend 22, thus achieving a sealed connection. A protrusion 23 is formed on the bottom surface of the cover plate 2 relative to the end of the bend 22, which is used to reduce the size of the rolled opening of the bend 22. Because the bladder skin 3 is rolled inside the bend 22, the thickness of the bladder skin 3 gradually increases, making it less likely to come off when connected to the bend 22, thus improving the firmness of the connection. The top of the cover plate 2 is provided with a mounting stud 24 and an air passage stud 25 opposite to the mounting stud 24. The air passage stud 25 connects to the inside of the bladder skin 3 and can be connected to an external air compressor to allow for inflation and deflation of the inside of the bladder skin 3.

[0031] Furthermore, the bottom of the cover plate 2 is integrally formed with a limiting inner cylinder 21 that is axially relative to the buffer block 111. The opening of the limiting inner cylinder 21 faces downward and is trumpet-shaped. When the bladder skin 3 is in a contracted state, the limiting inner cylinder 21 can be axially inserted into the limiting inner cylinder 21 to restrict the radial movement of the buffer block 111, thereby effectively preventing the bladder skin 3 from being subjected to radial external force and causing friction damage when it is compressed and stacked, thus improving its service life.

[0032] Furthermore, to improve the connection strength between the bladder 3 and the piston 1, a compression disc 112 is installed in the recess at the top of the piston 1, located between the buffer block 111 and the piston 1. The compression disc 112 can press the bladder 3 connected to the top of the piston 1, using pressure-assisted assembly to combine with the vulcanization connection, thereby improving the connection strength of the bladder 3. In this embodiment, the buffer block 111 is directly vulcanized and connected to the top of the compression disc 112. An assembly stud 1121 is axially provided at the bottom of the compression disc 112. The assembly stud 1121 axially penetrates the positioning hole 12 axially opened at the top of the piston 1 to connect with a nut, so that the compression disc 112 is installed in the recess at the top of the piston 1 and then vulcanized and connected with the bladder 3.

[0033] The inner surface of the notch at the top of piston 1 is a continuous bent surface 13, such as a wavy surface or a toothed surface. The outer periphery of the extrusion disc 112 meshes with the continuous bent surface 13 to increase the vulcanization contact area between the two and further improve the connection strength.

[0034] Example 2:

[0035] Based on the first embodiment described above, this embodiment also provides a limiting outer cylinder 14 that can surround the bladder skin 3.

[0036] Among them, such as Figure 3As shown, the limiting outer cylinder 14 is integrally formed on the periphery of the piston 1. The limiting outer cylinder 14 is bowl-shaped, and its radial dimension gradually increases relative to the axial direction of the piston 1, forming a gradually increasing cavity between the piston 1 and the limiting outer cylinder 14. This cavity accommodates the gradually stacking bladder 3 when the air spring is compressed, providing protection and dust prevention. Furthermore, it allows the air spring to support the radially expanding bladder 3 when in a semi-compressed state, thus improving radial support. For example, when applied to automobiles, it can effectively limit vehicle roll.

[0037] Example 3:

[0038] Figure 5 The third embodiment of the present invention is shown. Based on the second embodiment described above, the assembly stud 1121 is transformed into a pneumatic stud. A through hole communicating with the pneumatic stud is opened at the axis of the buffer block 111. The pneumatic stud is connected to the inside of the bladder 3. Its pneumatic end is connected tangentially to the cavity formed between the piston 1 and the limiting outer cylinder 14 through at least one set of electrically controlled valves 113 (e.g., solenoid valves) and connecting pipes 114 (high pressure pipes).

[0039] When the bladder 3 is depressurized or pressurized, the electronically controlled valve 113 opens. The high-pressure gas in the bladder 3's air chamber is discharged from the electronically controlled valve 113 and blown into the recessed cavity through the connecting pipe 114, thereby blowing out dust, impurities, etc., from the recessed cavity. This reduces the amount of impurities remaining in the recessed cavity, allowing the bladder 3 to be stored and preventing debris from scratching it. For example, when a vehicle is driving, stones, mud, and other impurities from the road surface may enter the recessed cavity; this blowing action can remove these impurities.

[0040] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An improved diaphragm air spring piston structure, characterized in that, include: Piston (1), cover plate (2) opposite to said piston (1), and bladder (3) sealingly connected between said piston (1) and cover plate (2); The cover plate (2) is provided with a limiting inner cylinder (21) on the surface of the piston (1). The opening of the limiting inner cylinder (21) is axially connected to a buffer block (111) at the top of the piston (1) so that when the bladder (3) is in a contracted state, the buffer block (111) is axially inserted into the limiting inner cylinder (21) to restrict the radial movement of the buffer block (111).

2. The improved diaphragm air spring piston structure according to claim 1, characterized in that: The piston (1) has an integrally formed limiting outer cylinder (14) surrounding the bladder (3) on its periphery.

3. The improved diaphragm air spring piston structure according to claim 2, characterized in that: The radial dimension of the limiting outer cylinder (14) gradually increases relative to the axial dimension of the piston (1).

4. The improved diaphragm air spring piston structure according to claim 2, characterized in that: Between the piston (1) and the buffer block (111) connected to its top, there is also a compression plate (112) adapted to the top of the piston (1). The compression plate (112) is used to press against the end of the bladder (3) connected to the top surface of the piston (1).

5. The improved diaphragm air spring piston structure according to claim 4, characterized in that: The piston (1) has a continuous bent surface (13) at the top, and the outer periphery of the extrusion disc (112) meshes with the continuous bent surface (13).

6. The improved diaphragm air spring piston structure according to claim 4, characterized in that: The bottom end of the extrusion disc (112) is provided with an assembly stud (1121) that extends through the bottom of the piston (1). The assembly stud (1121) is fitted with a connecting nut to allow the extrusion disc (112) to be installed on the top of the piston (1).

7. The improved diaphragm air spring piston structure according to claim 6, characterized in that: The assembly stud (1121) is a pneumatic stud, and its pneumatic end is connected tangentially to the cavity formed between the piston (1) and the limiting outer cylinder (14) through at least one set of electrically controlled valves (113) and connecting pipes (114).

8. The improved diaphragm air spring piston structure according to claim 1, characterized in that: The outer edge of the cover plate (2) is rolled inward to form a bent portion (22), and the skin (3) is vulcanized and rolled along the curling path of the bent portion (22) and connected inside the bent portion (22).

9. The improved diaphragm air spring piston structure according to claim 8, characterized in that: The bottom surface of the cover plate (2) has a protrusion (23) formed relative to the end of the bend (22), the protrusion (23) being used to reduce the size of the bend (22).

Images