Air spring fluctuating piston, manufacturing method thereof and air spring

Abstract

The invention relates to the technical field of air springs, and provides an air spring fluctuating piston, a manufacturing method thereof and an air spring, and the air spring fluctuating piston comprises a metal part and an injection molding part. The metal part comprises a buckling section used for being connected with the bag skin in a buckling mode, and one end of the buckling section is connected with a working section. The injection molding part is connected to the metal part in an injection molding mode, and at least part of the working section is composed of the injection molding part. The hollow spring fluctuating piston is provided with a partial injection molding part. The design of the novel structure not only reduces the weight, but also plays a positive role in reducing the cost. Through reasonable combination of metal and plastic materials, use of high-cost metal materials is reduced, meanwhile, the production process is optimized, and the production cost and the market price of the air spring are further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air springs, and particularly relates to an air spring undulating piston, a manufacturing method thereof, and an air spring. Background Art

[0002] In modern vehicle suspension systems, air springs are widely used to damp vibrations, stabilize vehicle driving performance, and enhance vehicle comfort. Air springs can effectively buffer external vibrations through the compression and expansion of air, providing a smoother riding experience. One of the core components of an air spring is the undulating piston, whose function is to adjust the stiffness and function of the spring through changes in the internal compressed air.

[0003] Existing undulating pistons usually adopt an integral metal structure, which not only includes the tooth end for clamping the bladder, but also includes the curved cross-sectional shape required for the bladder working surface. And the undulating piston with an all-metal structure is usually heavy. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide an air spring undulating piston, a manufacturing method thereof, and an air spring to reduce the weight of the air spring undulating piston.

[0005] To achieve the above object and other related objects, the present invention provides an air spring undulating piston applied to an air spring, the air spring including a bladder, and the air spring undulating piston including:

[0006] A metal part, the metal part including a clamping section for clamping and connecting the bladder, and one end of the clamping section is connected with a working section;

[0007] An injection molding part, injection molded and connected to the metal part, and at least part of the working section is formed by the injection molding part.

[0008] In a specific embodiment of the present invention, the entire working section is formed by the injection molding part.

[0009] In a specific embodiment of the present invention, the working section includes:

[0010] An inner cylinder part, entirely formed by the metal part, and the inner cylinder part and the clamping section are of an integral structure;

[0011] An outer wall part, entirely formed by the injection molding part, and the outer wall part is disposed around the outer peripheral wall of the inner cylinder part.

[0012] In a specific embodiment of the present invention, the area of the inner cylinder part far from the clamping section is an equal wall thickness area.

[0013] In a specific embodiment of the present invention, a first annular rib protruding radially along the inner cylinder portion is provided at one end of the clamping section close to the working section, and the first annular rib is in contact with one end of the outer wall portion close to the clamping section.

[0014] In a specific embodiment of the present invention, a first annular groove recessed radially along the inner cylinder portion is provided on the outer peripheral wall of the inner cylinder portion, and one side of the first annular rib close to the outer wall portion constitutes the groove wall of the first annular groove.

[0015] In a specific embodiment of the present invention, a second annular rib protruding radially along the inner cylinder portion is provided on the outer peripheral wall of the inner cylinder portion, and the second annular rib is in contact with one end of the outer wall portion far from the clamping section.

[0016] In a specific embodiment of the present invention, a second annular groove recessed radially along the inner cylinder portion is provided on the outer peripheral wall of the inner cylinder portion, and one side of the second annular rib close to the outer wall portion constitutes the groove wall of the second annular groove.

[0017] In a specific embodiment of the present invention, a plurality of protruding portions are provided on the connection surface of the metal portion corresponding to the injection molding portion, and the protruding portions are used to be embedded in the injection molding portion.

[0018] The present invention also provides a method for manufacturing an air spring undulating piston, which is used to manufacture the air spring undulating piston, and the method for manufacturing the air spring undulating piston includes:

[0019] Machining the metal portion by machining;

[0020] Injecting the injection molding portion on the metal portion to form the air spring undulating piston.

[0021] The present invention also provides an air spring, including the air spring undulating piston.

[0022] The present invention provides an air spring undulating piston, its manufacturing method, and an air spring. In the above solution, the air spring undulating piston has a partial injection molding portion. The design of this new structure not only realizes the reduction of weight but also plays a positive role in reducing costs. Through the reasonable combination of metal and plastic materials, the use of high-cost metal materials is reduced, and at the same time, the production process is optimized, further reducing the production cost and the market price of the air spring. Description of the Drawings

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0024] Figure 1 It is a cross-sectional view of the air spring undulating piston in the second embodiment of the present invention;

[0025] Figure 2 It is a cross-sectional view of the metal part of the air spring undulating piston in the second embodiment of the present invention;

[0026] Figure 3 It is a cross-sectional view of the injection-molded part of the air spring undulating piston in the second embodiment of the present invention;

[0027] Figure 4 It is a cross-sectional view of the metal part of the air spring undulating piston in another solution in the second embodiment of the present invention;

[0028] Figure 5 It is a cross-sectional view of the air spring undulating piston in the first embodiment of the present invention;

[0029] Figure 6 It is a cross-sectional view of the metal part of the air spring undulating piston in the first embodiment of the present invention;

[0030] Figure 7 It is a cross-sectional view of the injection-molded part of the air spring undulating piston in the first embodiment of the present invention.

[0031] Explanation of reference numerals: 10, metal part; 20, injection-molded part; 30, crimping section; 31, first annular rib; 40, inner cylinder part; 41, first annular groove; 42, second annular groove; 43, second annular rib; 50, outer wall part. Detailed implementation manners

[0032] The following illustrates the implementation manners of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0033] It should be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the illustrations, rather than being drawn according to the number, shape, and size of the components in actual implementation. In actual implementation, the type, quantity, and ratio of each component can be arbitrarily changed, and the component layout type may also be more complex.

[0034] In the suspension system of modern vehicles, air springs are widely used for shock absorption and vehicle driving stability, providing a more comfortable riding experience. One of the core components of the air spring - the undulating piston, by controlling the flow of compressed air, adjusts the stiffness of the air spring, thereby achieving the shock absorption effect. The design of the undulating piston not only affects the working performance of the air spring but also directly impacts its manufacturing cost and service life.

[0035] Traditional air spring undulating pistons usually adopt an integral structure, which includes a tooth end for clamping the airbag, a working surface of the airbag with a curved cross-section, and a sealing part at the other end. During vehicle driving, as the road vibration changes, the air in the undulating piston is continuously compressed and expanded, and the airbag moves up and down in contact with the outer wall of the undulating piston, thus realizing the shock absorption function of the air spring. To ensure airtightness, a sealing structure needs to be provided on the outer peripheral part of the undulating piston to prevent air leakage.

[0036] However, the existing undulating pistons often have a design with uneven wall thickness in structure. Especially in the tooth end part for clamping the airbag, the wall thickness of the piston is relatively thick, while other parts are relatively thin. This wall thickness difference makes the processing process of the undulating piston more complex. Usually, processes such as cold extrusion or forging are required for one-time forming, and then machining is carried out. Due to the large wall thickness difference, it is difficult to achieve a smooth transition from the thick wall to the thin wall, and it is easy to generate processing difficulties when forming the outer shape curve, thus increasing the production cost.

[0037] With the continuous improvement of vehicle comfort requirements, more and more high-end vehicle models are starting to be equipped with multi-chamber air spring systems, and the undulating piston has become an important part of the air spring system. However, with the growth of demand, the traditional integral undulating piston structure faces huge challenges, especially in terms of lightweight design. In order to reduce the weight of the undulating piston and lower the production cost, a new structural design is urgently needed.

[0038] In addition, with the increasing emphasis on lightweight in the automotive industry, how to achieve weight reduction and cost reduction through innovative design while ensuring performance has become a key requirement for current technological development. The design of the new structure can not only reduce the production cost but also improve the performance of the air spring system and the overall comfort of the vehicle.

[0039] Therefore, the development of a undulating piston with a new structure, which can improve performance while reducing weight, has become an important goal in the design of automotive air spring systems. This new-structured undulating piston can not only reduce the vehicle body weight and improve fuel economy, but also reduce manufacturing costs while maintaining good shock absorption performance, meeting the requirements of lightweight design.

[0040] As Figures 1 to 7 shown, the present invention provides an air spring undulating piston, which is applied to an air spring. The air spring includes a bladder. The air spring undulating piston includes a metal part 10 and an injection molding part 20.

[0041] The metal part 10 includes a clamping section 30 for clamping and connecting the bladder. The clamping section 30 is used for clamping and connecting the bladder of the air spring. Multiple annular ribs are arranged on the outer peripheral wall of the clamping section 30 to enhance the clamping connection with the bladder and ensure the sealing performance. The material of the metal part 10 is selected as AL6061-T4 aluminum alloy, which has excellent strength and corrosion resistance and is suitable for long-term use in a pressure environment.

[0042] The other end of the clamping section 30 is connected to a working section, which is responsible for contacting with compressed air to adjust the stiffness of the air spring, thereby realizing the shock absorption function. The injection molding part 20 is injection-molded and connected to the metal part 10, and at least part of the working section is composed of the injection molding part 20. The injection molding part 20 uses PA6+GF50 material (glass fiber reinforced nylon 6). This material has high strength, heat resistance and wear resistance and is suitable for use in complex working environments. The injection molding technology makes the manufacturing process more precise, and at the same time can effectively reduce the weight and lower the production cost.

[0043] Adopting the design of combining metal and plastic, compared with the traditional all-aluminum alloy structure, the overall weight of the new structure is reduced by 194 grams, and the weight reduction rate reaches 23.8%. By reducing the weight, not only the requirements of lightweight design are met, but also the fuel efficiency and emission reduction performance of the vehicle are effectively improved.

[0044] The new undulating piston is analyzed by CAE (Computer Aided Engineering) to ensure that it meets the design requirements in terms of performance, including pressure resistance, durability and sealing performance, etc. Especially in the control of the air compression and expansion process, it can stably adjust the stiffness of the air spring and provide excellent shock absorption performance.

[0045] The combination of metal and plastic reduces the dependence on high-cost metal materials. At the same time, the injection molding process makes the production process more efficient, precise, and reduces the production time and energy consumption. These factors together reduce the manufacturing cost and can enter the market at a more competitive price. The reduced weight and optimized design not only improve the fuel efficiency of the vehicle, but also further reduce emissions, meeting the future industry requirements of environmental protection and energy conservation.

[0046] Example 1, as shown in Figures 5 to 7 shown, the entire working section is composed of the injection molding part 20. The metal part 10 only includes the crimping section 30. As a key part for connecting the air spring bladder, a plurality of annular ribs are designed on the outer peripheral wall of the crimping section 30 to enhance the crimping connection with the bladder. The metal part 10 is made of AL6061-T4 aluminum alloy, which is especially suitable for use in high-pressure environments due to its excellent strength, toughness, and corrosion resistance, ensuring that the crimping section 30 maintains good sealing performance and durability for a long time.

[0047] Example 2, as shown in Figures 1 to 4 shown, the working section includes an inner cylinder part 40 and an outer wall part 50.

[0048] The inner cylinder part 40 is completely made of metal and forms an integral structure with the crimping section 30. This design strengthens the overall structural strength, ensuring that the inner cylinder part 40 can withstand high pressure and resist deformation during operation, and stabilizing the working effect of the air spring system.

[0049] The outer wall part 50 is completely composed of the injection molding part 20. This part is arranged on the outer periphery of the inner cylinder part 40 and is made of PA6+GF50 (glass fiber reinforced nylon 6) material, which has good heat resistance and anti-friction properties. The injection molding technology not only improves the manufacturing precision but also optimizes the production efficiency and reduces the production cost. The precisely controlled outer wall roughness design helps reduce the friction when contacting the bladder, improving the long-term durability and comfort of the product.

[0050] In this design, the outer wall part 50 not only reduces the overall weight but also ensures that the surface in contact with the bladder has an appropriate roughness during the operation of the air spring to avoid scratching the bladder. The roughness requirement of the outer wall part 50 reaches Ra3.2, ensuring a smooth surface without affecting the sealing performance. The design of the outer wall part 50 meets the roughness requirement of Ra3.2, avoiding the risk of scratching the bladder and further improving the stability and durability of the air spring system.

[0051] As shown in Figure 2 、 3 shown, the area of the inner cylinder part 40 far from the crimping section 30 is an equal wall thickness area. That is, the lower part of the inner cylinder part 40 in Figure 2 、 3 is an equal wall thickness area. The thickness of the equal wall thickness area is less than that of other areas. The wall thickness of the equal wall thickness area is 2.2 mm, and the tolerance is ±0.3 mm. The equal wall thickness area needs to bear the internal pressure of the air spring. The equal wall thickness area is convenient for processing with materials of the same thickness. This design not only improves the processing convenience but also ensures the structural stability.

[0052] As shown in Figure 1 、 2, as shown in FIG. 4, a first annular rib 31 extending radially from the inner cylinder portion 40 is provided at one end of the clamping section 30 close to the working section, and the first annular rib 31 is in contact with one end of the outer wall portion 50 close to the clamping section 30. The injection molding portion 20 is the outer wall portion 50 connected to the metal portion 10, and it is made of materials such as PA6+GF50. During the production process, the injection molding of the outer wall portion 50 may be offset due to different factors. By designing this annular rib, it can effectively prevent the injection molding portion 20 from being overly pushed or misaligned, maintaining the precise docking and stability of the assembly. The structural design of the first annular rib 31 and the clamping section 30 enhances the overall load-bearing capacity. When the piston is working, the internal pressure is transmitted to each component through this structure, enabling the piston to better withstand the pressure fluctuations under the external environment and working conditions. Especially when driving at high speed or with a large load, it can maintain the stability and efficient working state of the piston component.

[0053] As Figure 1 , 2 shown, a first annular groove 41 recessed radially from the inner cylinder portion 40 is provided on the outer peripheral wall of the inner cylinder portion 40, and one side of the first annular rib 31 close to the outer wall portion 50 constitutes the groove wall of the first annular groove 41. It is used for the injection molding portion 20 to be embedded. The groove feature can make the plastic part after injection molding better hold the metal part 10, and the first annular rib 31 also provides a limiting function for the plastic part after injection molding. The first annular groove 41 is located on the outer peripheral wall of the inner cylinder portion 40 and is recessed radially from the inner cylinder portion 40. The key function of this design is to provide an accurate embedding space for the injection molding portion 20 (i.e., the plastic part of the outer wall portion 50). During the injection molding process, the plastic part can be more firmly formed and positioned in the first annular groove 41, ensuring the tight combination between the injection molding portion 20 and the metal inner cylinder portion 40, and reducing the sealing problems caused by offset or error. Through this groove structure design, the edge of the plastic component will be more fitted to the metal part 10, thereby improving the bonding firmness between the injection molding portion 20 and the metal part 10, avoiding the influence of the external environment on the connection part, and ensuring the stability of the system. Especially under long-term working conditions, this tight combination can significantly reduce the risk of component loosening or falling off.

[0054] As Figure 4As shown, a second annular rib 43 extending radially of the inner cylinder portion 40 is provided on the outer peripheral wall of the inner cylinder portion 40, and the second annular rib 43 abuts against one end of the outer wall portion 50 away from the clamping section 30. The second annular rib 43 cooperates with the first annular rib 31 and is located at one end of the outer peripheral wall of the inner cylinder portion 40 away from the clamping section 30. This design forms an injection molding area to ensure that the injection molding portion 20 can be accurately embedded in the inner cylinder portion 40. The second annular rib 43 not only enhances the firmness of the combination between components, but also improves the load-bearing capacity of the inner cylinder portion 40 and reduces the offset caused by external pressure. The injection molding portion 20 is injection molded in the injection molding area. The outermost ends of the first annular rib 31 and the second annular rib 43 in the radial direction need to meet the requirement of surface roughness Ra3.2 to avoid scratching the leather bag.

[0055] As Figure 4 shown, a second annular groove 42 recessed radially of the inner cylinder portion 40 is provided on the outer peripheral wall of the inner cylinder portion 40, and one side of the second annular rib 43 close to the outer wall portion 50 constitutes the groove wall of the second annular groove 42 for the injection molding portion 20 to be embedded. The second annular groove 42 is similar to the first annular groove 41. The design of the second annular groove 42 is located on the other side of the inner cylinder portion 40 to form a cooperation with the second annular rib 43. This structure not only further enhances the firm combination between the injection molding portion 20 and the metal portion 10, but also helps to improve the sealing performance to ensure stability and pressure resistance in a high-pressure environment.

[0056] In a specific embodiment of the present invention, a plurality of protruding portions are provided on the connection surface of the metal portion 10 corresponding to the injection molding portion 20, and the protruding portions are used to be embedded in the injection molding portion 20. The metal portion 10 aims to increase the contact area between the injection molding portion 20 and the metal portion 10. The protruding portions can be longitudinal or transverse ribs, or in the form of convex points or concave points, etc. The presence of these protruding portions significantly increases the contact force between the metal and the plastic, avoids the plastic components from falling off or being displaced due to tumbling during the operation of the system, and improves the firmness and stability of the connection.

[0057] The present invention also provides a method for manufacturing an air spring undulating piston. The method for manufacturing an air spring undulating piston is used to manufacture the air spring undulating piston, and the method for manufacturing an air spring undulating piston includes:

[0058] The metal part 10 is processed by machining. First, a metal part 10 is required, usually made of aluminum, steel or other alloys. Machining refers to the processing of the shape and size of the metal by mechanical means. The machining method is spinning. Spinning is a commonly used metal forming process. The metal part 10 is fixed on a rotating spindle and processed by a die and tools to form the required precise shape and wall thickness. During the spinning process, the metal is subjected to certain pressure and temperature under high-speed rotation, resulting in local plastic deformation, thus achieving the formation of complex shapes. The advantages of the spinning process are high forming accuracy, high process efficiency, and the ability to handle complex geometries.

[0059] The injection molded part 20 is injection molded onto the metal part 10 to form the air spring undulating piston. Suitable thermoplastic or thermosetting plastic particles are heated to a flowing state and then injected into a pre-prepared mold. Under appropriate pressure and temperature conditions, the plastic cools and solidifies to form the required injection molded part 20. At this time, it is necessary to ensure that the combination of the injection molded part 20 and the metal part 10 is uniform to ensure that the air spring undulating piston can withstand repeated stress and deformation during use. If the injection molded part 20 uses a thermosetting material, its performance can be further improved by the vulcanization process. The vulcanization process is a process of further cross-linking the polymer network structure through chemical reactions. By heating and adding vulcanizing agents, cross-linking reactions occur in the polymer chains of the plastic, thus significantly improving the strength, elasticity and durability of the material. The vulcanized material will have better wear resistance and temperature stability, suitable for the application of the air spring undulating piston in various working environments.

[0060] The present invention also proposes an air spring, including the air spring undulating piston described above.

[0061] In summary, the present invention proposes a pneumatic spring undulating piston, its manufacturing method, and an air spring. In the above solution, the pneumatic spring undulating piston has a partial injection molding part 20. The design of this new structure not only realizes weight reduction but also plays a positive role in cost reduction. Through the reasonable combination of metal and plastic materials, the use of high-cost metal materials is reduced, and at the same time, the production process is optimized, further reducing the production cost and the market price of the pneumatic spring. The new design can provide better shock absorption effect by adjusting the stiffness of the air spring, improving the comfort of the vehicle suspension system and providing a smoother driving experience for passengers. By replacing the traditional all-metal structure with the injection molding process, not only the manufacturing precision and efficiency are improved, but also the production cost is effectively reduced. At the same time, the dependence on high-cost metal materials is reduced, and the market competitiveness is enhanced. The method of combining machining and injection molding improves the production efficiency. Especially during the injection molding process, precise structural designs (such as annular ribs and grooves) are combined to ensure the tight combination between the injection molding part 20 and the metal part 10, reducing the sealing problems caused by offset or error. The design of the inner cylinder part 40 enables it to withstand higher internal pressure while maintaining the structural stability. This ensures that the pneumatic spring undulating piston can still maintain high efficiency under various working conditions. By setting multiple protruding parts facing the injection molding part 20 and using the design of multiple annular grooves, the contact area and stability between the metal and the plastic are enhanced, reducing the risk of loosening or falling off during the working process.

[0062] The above embodiments are only illustrative of the principles and effects of the present invention and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

[0063] In the description herein, numerous specific details are provided, such as examples of components and / or methods, to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that the embodiments of the present invention can be practiced without one or more of the specific details or by other devices, systems, components, methods, parts, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0064] References throughout this specification to "one embodiment", "an embodiment", or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention and not necessarily in all embodiments. Thus, the appearances of the phrases "in one embodiment", "in an embodiment", or "in a specific embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined in any suitable manner with one or more other embodiments. It is to be understood that other variations and modifications of the embodiments of the invention described and shown herein may be made in accordance with the teachings herein and will be considered part of the spirit and scope of the present invention.

[0065] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separated or more integrated manner, or even removed in some cases where they are inoperable or provided because they may be useful for a particular application.

[0066] In addition, unless otherwise expressly specified, any of the marker arrows in the figures should be considered merely exemplary and not limiting. Further, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or". Where the term is anticipated to be unclear because of the ability to provide separation or combination, the combination of components or steps will also be regarded as having been specified.

[0067] As used in the description herein and throughout the claims below, unless otherwise indicated, the words "a", "an", and "the" include plural references. Also, as used in the description herein and throughout the claims below, unless otherwise indicated, the meaning of "in" includes "in" and "on".

[0068] The foregoing description of the embodiments of the invention shown (including what is described in the Abstract of the Disclosure) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. While specific embodiments of the invention and examples of the invention have been described herein for illustrative purposes only, various equivalent modifications will be apparent to and can be made by those skilled in the art within the spirit and scope of the present invention. As noted, these modifications can be made to the present invention in accordance with the foregoing description of the embodiments of the invention and these modifications will be within the spirit and scope of the present invention.

[0069] The present disclosure has described systems and methods in general terms to facilitate an understanding of the details of the invention. In addition, various specific details have been given to provide a general understanding of embodiments of the invention. However, one of ordinary skill in the relevant art will recognize that embodiments of the invention may be practiced without one or more of the specific details, or with other devices, systems, components, methods, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been shown or described in detail to avoid obscuring aspects of the embodiments of the invention.

[0070] Accordingly, while the invention has been described herein with reference to its specific embodiments, modifications, various changes, and substitutions are also within the above disclosure, and it should be understood that in some instances, some features of the invention may be employed without a corresponding use of other features without departing from the scope and spirit of the claimed invention. Thus, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terms and / or the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the invention will be determined only by the appended claims.

Claims

1. A hollow spring heaving piston, characterized in that: Applied to an air spring, the air spring comprises a bladder skin, and the air spring undulation piston comprises: A metal part, the metal part comprising a pressing section for pressing and connecting the bag skin, one end of the pressing section being connected to a working section; The injection molding part is injection-moldedly connected to the metal part, and at least a part of the working section is formed by the injection molding part.

2. The empty spring heaving piston according to claim 1, characterized in that: The working section is entirely composed of the injection molding part.

3. The empty spring heaving piston according to claim 1, characterized in that: The working section includes: The inner cylinder part is entirely composed of metal parts, and the inner cylinder part and the buckling section are an integrated structure; The outer wall part is entirely composed of an injection molded part, and the outer wall part surrounds the outer peripheral wall of the inner cylinder part.

4. The empty spring heaving piston according to claim 3, characterized in that: The area of ​​the inner tube portion away from the buckling section is an area of ​​equal wall thickness.

5. The empty spring heaving piston according to claim 3, characterized in that: One end of the buckling section close to the working section is provided with a first annular convex rib radially extending along the inner cylinder portion, and the first annular convex rib is in contact with one end of the outer wall portion close to the buckling section.

6. A hollow spring heaving piston according to claim 5, characterized in that: The outer peripheral wall of the inner cylinder portion is provided with a first annular groove recessed along the radial direction of the inner cylinder portion, and the first annular convex rib close to the outer wall portion constitutes a groove wall of the first annular groove.

7. A hollow spring heaving piston according to claim 4, 5 or 6, characterized in that: The outer peripheral wall of the inner cylinder portion is provided with a second annular convex rib protruding radially along the inner cylinder portion, and the second annular convex rib is in contact with an end of the outer wall portion away from the buckling section.

8. The empty spring heaving piston according to claim 6, characterized in that: The outer peripheral wall of the inner cylinder portion is provided with a second annular groove which is recessed along the radial direction of the inner cylinder portion, and the second annular convex rib forms a groove wall of the second annular groove on one side close to the outer wall portion.

9. The empty spring heaving piston according to claim 1, characterized in that: A plurality of protrusions are arranged on the connection surface of the metal part corresponding to the injection part, and the protrusions are used to be embedded in the injection part.

10. A method for manufacturing an empty spring undulating piston, characterized in that: The method for manufacturing an empty spring undulating piston is used to manufacture an empty spring undulating piston as claimed in any one of claims 1 to 8, and the method for manufacturing an empty spring undulating piston comprises: processing the metal part by machining; The injection-molded portion is injection-molded on the metal portion to form the empty spring heave piston.

11. An air spring, characterized in that: It comprises the empty spring undulating piston as described in any one of claims 1 to 8.

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