Energy storage buffer air bag for automobile shock absorber

Abstract

The utility model belongs to the technical field of damper buffer air bag structure, specifically provides a kind of energy storage buffer air bag for automobile damper including the air bag body of cylindrical, the one end of air bag body is equipped with air cock, the inside of air cock with air bag body is communicated, the bag wall of air bag body is composite film, the composite film includes the protective layer, barrier layer, oil resistance layer and heat-sealing layer that set gradually from outside to inside, the joint of composite film adopts transient heat-sealing sealing joint.The utility model by the bag wall of air bag body is set to be the composite film transient heat-sealing sealing joint of the protective layer, barrier layer, oil resistance layer and heat-sealing layer composition, ensure that air bag maintains sealing property, oil resistance, puncture resistance and adhesive strength under complex working condition.

Description

Technical Field

[0001] This application belongs to the technical field of shock absorber buffer air bag structure, and more specifically, relates to an energy storage buffer air bag for automotive shock absorbers. Background Technology

[0002] The shock absorber is a core component of a vehicle's suspension system, and its performance directly affects ride comfort, handling stability, and component lifespan. Traditional shock absorbers generate damping force through the flow of hydraulic oil to attenuate vibrations. However, under high-frequency or extreme conditions, simple hydraulic damping is insufficient to balance comfort and dynamic response. Therefore, energy-storing airbags have been introduced into shock absorber design. By placing an airbag inside the shock absorber to store and release energy, damping characteristics are optimized. For a specific installation structure, please refer to patent number CN2861610Y, entitled: Built-in Airbag Shock Absorber for Automobiles.

[0003] However, most current automotive shock absorber air bags use rubber (nitrile rubber). Although rubber has a certain degree of elasticity, it has high gas permeability (up to 30cm in differential pressure tests). 3 / (m 2 The pressure of 0.1 MPa for 24 hours can lead to gas leakage during long-term use, resulting in a significant decrease in buffering efficiency. Additionally, the rubber material is prone to hardening and aging at high temperatures and brittleness and cracking in extremely cold weather. Furthermore, the energy storage buffer air bag is located inside the car shock absorber and is in long-term contact with the damping oil. Nitrile rubber has insufficient corrosion resistance to damping oil, which leads to swelling and poor adhesion strength over time, further shortening its service life. Utility Model Content

[0004] Based on the above-mentioned technical problems, this application provides an energy storage buffer air bag for automotive shock absorbers to solve the technical problems of high gas permeability, insufficient corrosion resistance and poor bonding strength of the buffer air bags in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: providing an energy storage buffer air bag for automotive shock absorbers, including a cylindrical air bag body, one end of which is provided with an air nozzle, the air nozzle being connected to the interior of the air bag body, the bag wall of the air bag body being a composite film, the composite film including a protective layer, a barrier layer, an oil-resistant layer and a heat-sealing layer arranged sequentially from the outside to the inside, and the seams of the composite film being sealed by instantaneous heat sealing.

[0006] Furthermore, the air bag body includes a first composite membrane layer and a second composite membrane layer. The first composite membrane layer is cylindrical, and the second composite membrane layer is cylindrical. The first composite membrane layer and the second composite membrane layer are inner and outer sleeved together, and the interlayer between them is sealed to form an air chamber.

[0007] Furthermore, the ends of the first composite film layer and the corresponding ends of the second composite film layer are overlapped and sealed by instantaneous heat sealing.

[0008] Furthermore, the root of the air nozzle is sandwiched between the end of the first composite film layer and the end of the second composite film layer and is sealed by instantaneous heat sealing.

[0009] Furthermore, the air nozzle is a cavity-enhancing connecting air nozzle made of either PP or PA.

[0010] Furthermore, the protective layer is made of PET material.

[0011] Furthermore, the barrier layer is made of AL material.

[0012] Furthermore, the oil-resistant layer is made of PA material.

[0013] Furthermore, the heat-sealing layer is made of either PP or PA material.

[0014] Compared with the prior art, the beneficial effects of the energy storage buffer air bag for automotive shock absorbers provided in this application are: 1. By setting the bag wall of the air bag body to be a composite membrane consisting of a protective layer, a barrier layer, an oil-resistant layer and a heat-sealing layer for instantaneous heat sealing, the air bag can maintain its sealing performance, oil resistance, puncture resistance and adhesion strength under complex working conditions. 2. The first composite membrane layer and the second composite membrane layer of the air bag body are connected to the air nozzle through an instant heat sealing process, which eliminates the risk of glue aging or falling off and ensures that there is no leakage at the connection between the air bag body and the air nozzle for a long time. 3. By using PET material for the protective layer, the puncture resistance and abrasion resistance of the air bag body are increased. By using AL and PA materials for the barrier layer and oil-resistant layer, it can resist the corrosion of damping oil and form a double puncture-resistant barrier with the protective layer. By using PP or PA material for the heat-sealing layer, it can better combine with the protective layer, barrier layer and oil-resistant layer to form a fully sealed structure, thereby adapting to the complex chemical environment inside the shock absorber. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective view of an energy storage buffer air bag for an automotive shock absorber according to the present invention. Figure 2This is a schematic diagram of the structure of the first composite membrane layer of this utility model; Figure 3 This is a schematic diagram of the installation structure of the air bag body of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Air bag body; 11. First composite membrane layer; 111. Protective layer; 112. Barrier layer; 113. Oil-resistant layer; 114. Heat-sealing layer; 2. Air nozzle. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, 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, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] Please refer to the following: Figures 1 to 3As shown, the following describes an energy storage buffer air bag for an automotive shock absorber provided by an embodiment of this application. The energy storage buffer air bag for an automotive shock absorber of this utility model includes an air bag body 1 and an air nozzle 2. The air bag body 1 is a through-type cylindrical shape. By setting the air bag body 11 into a cylindrical structure, the fit with the inner cavity of the shock absorber is improved. The air bag body 1 includes a first composite film layer 11 and a second composite film layer. Both the first composite film layer 11 and the second composite film layer are cylindrical. The first composite film layer 11 and the second composite film layer are inner and outer sleeved, and the interlayer between them is sealed, forming an air chamber.

[0024] Specifically, the ends of the first composite film layer 11 overlap with the corresponding ends of the second composite film layer and are sealed by instant heat sealing. It should be noted that instant heat sealing technology is an existing technology, which specifically involves rapidly heating the surface of the material at high temperature, causing it to reach a molten state in a very short time and achieving interlayer bonding. This method can achieve strong adhesion between materials without the use of glue, avoiding the risk of leakage caused by glue aging and peeling, and improving the reliability during long-term use.

[0025] The air nozzle 2 is a cavity-enhancing connection that connects to the interior of the air bag body 1. The air nozzle 2 is made of either PP or PA. Specifically, the root of the air nozzle 2 is sandwiched between the end of the first composite membrane layer 11 and the end of the second composite membrane layer, and is sealed by instantaneous heat sealing. It should be noted that in existing technologies, the air nozzle 2 is mostly bonded to the air bag body 1 with adhesive. However, during long-term use, vibration or temperature changes can easily cause delamination, leading to air leakage. By using PP or PA material for the air nozzle 2 and sealing it to the first and second composite membrane layers with instantaneous heat sealing, a stronger bond is achieved, eliminating the risk of adhesive aging or detachment. This ensures a long-term leak-free connection between the air bag and the air nozzle 2. Furthermore, PP material is resistant to vibration damping oil corrosion and maintains elasticity within a temperature range of -40℃ to 120℃, extending its service life. In addition, the cavity-enhancing structure of the air nozzle 2 reduces gas flow resistance, allowing for faster inflation and deflation of the shock absorber.

[0026] The airbag body 1 has a composite membrane wall, which includes a protective layer 111, a barrier layer, an oil-resistant layer 113, and a heat-sealing layer 114 arranged sequentially from the outside to the inside. The seams of the composite membrane are sealed by instant heat sealing. Specifically, the protective layer 111 is made of PET material. PET (polyethylene terephthalate) material has high surface hardness, effectively resisting scratches from sharp parts and preventing airbag damage. At the same time, PET material has a low coefficient of friction, which can reduce long-term friction wear with metal parts and adapt to complex motion environments. In addition, PET material has a low heat shrinkage rate, ensuring that the airbag maintains its shape and sealing performance under temperature changes. The barrier layer 112 is made of aluminum (AL) material. The AL (aluminum) layer has low permeability to gases such as oxygen and nitrogen (<0.1cm).3 / (m 2 (24h·0.1 MPa), which reduces the long-term leakage problem of rubber air bags in the prior art; The oil-resistant layer 113 is made of PA material. The PA (nylon) layer can resist the corrosion of damping oil and lubricating grease, avoiding the swelling and adhesion problems caused by oil penetration of traditional rubber. At the same time, the PA layer and the PET layer work together to form a double puncture-resistant barrier, improving the survivability of the air bag under extreme working conditions. In addition, the PA layer has a moderate elastic modulus, which can effectively alleviate the brittleness of the AL layer, so that the composite film layer has both rigidity and flexibility. The heat-sealing layer 114 is made of PP or PA material. PP (polypropylene) has a narrow melting temperature range (approximately 160-180℃) and a precise heat-sealing window, ensuring consistent interlayer bonding strength. At the same time, PP material is resistant to acids, alkalis, and oil stains. When combined with PA and AL layers, it forms a fully sealed structure to better adapt to the complex chemical environment inside the shock absorber.

[0027] It should be noted that the airbag body 1 in this embodiment is used in the shock absorber of the car chassis suspension. Specifically, the airbag body 1 is set between the inner and outer cylinders of the shock absorber. One end of the air nozzle 2 is connected to the inside of the airbag body 1, and the other end is connected to the air inlet of the shock absorber. During operation, a certain amount of gas (such as nitrogen) is injected into the airbag body 1 through the air nozzle 2. In this way, when the shock absorber reciprocates due to road bumps, the hydraulic oil will achieve a better damping effect by squeezing the gas in the airbag. This will not be elaborated further here.

[0028] In a specific implementation of this invention, gas is injected into the airbag through the air nozzle 2 to form a closed air chamber. When the shock absorber reciprocates due to road bumps while the vehicle is in motion, hydraulic oil compresses the gas inside the airbag. The damping force is adjusted through gas compression and release, optimizing the shock absorption effect. The first composite membrane layer 11 and the second core membrane layer of the airbag body 1 are connected to the air nozzle 2 through an instant heat-sealing process, eliminating the risk of adhesive aging or detachment and ensuring long-term leak-free connection between the airbag body 1 and the air nozzle 2. Through the coordinated work of the protective layer 111, barrier layer 112, oil-resistant layer 113, and heat-sealing layer 114 of the first composite membrane layer 11 and the second core membrane layer, the airbag body 1 maintains its sealing performance, oil resistance, and puncture resistance under complex working conditions. At the same time, the instant heat-sealing process enhances the reliability of the bonding between the layers.

[0029] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present utility model specification has recorded each combined embodiment and can support different combined embodiments.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy storage buffer air bag for automotive shock absorbers, characterized in that, include: The air bag body is cylindrical, with an air nozzle at one end. The air nozzle is connected to the interior of the air bag body. The bag wall of the air bag body is a composite film. The composite film includes a protective layer, a barrier layer, an oil-resistant layer and a heat-sealing layer arranged sequentially from the outside to the inside. The seams of the composite film are sealed by instant heat sealing.

2. The energy storage buffer air bag for automotive shock absorbers according to claim 1, characterized in that, The air bag body includes a first composite membrane layer and a second composite membrane layer. The first composite membrane layer is cylindrical, and the second composite membrane layer is cylindrical. The first composite membrane layer and the second composite membrane layer are interlayered and the interlayer between them is sealed to form an air chamber.

3. The energy storage buffer air bag for automotive shock absorbers according to claim 2, characterized in that, The ends of the first composite film layer and the corresponding ends of the second composite film layer are overlapped and sealed by instantaneous heat sealing.

4. The energy storage buffer air bag for automotive shock absorbers according to claim 2, characterized in that, The root of the air nozzle is sandwiched between the end of the first composite film layer and the end of the second composite film layer and is sealed by instantaneous heat sealing.

5. The energy storage buffer air bag for automotive shock absorbers according to claim 1, characterized in that, The air nozzle is a cavity-enhancing connecting air nozzle, and its material is PP or PA.

6. The energy storage buffer air bag for automotive shock absorbers according to claim 1, characterized in that, The protective layer is made of PET material.

7. The energy storage buffer air bag for automotive shock absorbers according to claim 1, characterized in that, The barrier layer is made of AL material.

8. The energy storage buffer air bag for automotive shock absorbers according to claim 1, characterized in that, The oil-resistant layer is made of PA material.

9. The energy storage buffer air bag for automotive shock absorbers according to claim 1, characterized in that, The heat-sealing layer is made of PP or PA material.

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