A dual air spring shock absorber

Abstract

This utility model relates to the field of air spring vibration damper technology, and more particularly to a dual air spring vibration damper, including a lower connecting seat, an upper connecting seat, and a damper. An outer air spring is provided between the lower and upper connecting seats. The bottom of the upper connecting seat has an upper boss, and the bottom end of the upper boss has a guide rod. An inner air spring is provided on the guide rod and is located inside the outer air spring. The top of the lower connecting seat has a lower boss, and the bottom of the lower connecting seat has a sliding bearing. The guide rod passes through the lower boss and is fitted into the sliding bearing. In this utility model, the outer air spring can bear the main load and attenuate low-frequency large-amplitude vibrations, while the inner air spring focuses on buffering high-frequency small-amplitude vibrations. The two work together to achieve full coverage of "low-frequency load stabilization + high-frequency vibration damping," solving the problem of poor adaptability of traditional single air springs to complex working conditions. It is especially suitable for scenarios where multiple vibration frequencies alternate, such as automobiles and industrial equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of air spring vibration dampers, specifically a dual air spring vibration damper. Background Technology

[0002] Currently, various vibration damping devices are widely used in fields such as rail transportation, heavy machinery, and precision instruments to reduce vibration and shock, improve operational stability, and protect equipment structures. Among them, air springs, with their excellent nonlinear stiffness characteristics, adjustable damping, and vibration isolation effect, have become an important component of modern vibration damping technology.

[0003] While traditional single-air-spring vibration isolators have a certain vibration reduction capability, they often suffer from poor vibration reduction effect, limited stiffness adjustment range, and insufficient stability when facing complex working conditions (such as alternating high-frequency vibration and low-frequency large-amplitude vibration, frequent load changes, etc.). Therefore, a dual-air-spring vibration isolator is needed to improve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a dual air spring damper to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A dual air spring vibration damper includes a lower connecting seat, an upper connecting seat, and a damper. An outer air spring is provided between the lower and upper connecting seats. The bottom of the upper connecting seat has an upper boss, and the bottom end of the upper boss has a guide rod. An inner air spring is provided on the guide rod and is located inside the outer air spring. The top of the lower connecting seat has a lower boss, and the bottom of the lower connecting seat has a sliding bearing. The guide rod passes through the lower boss and is fitted in the sliding bearing. An upper buffer pad and a lower buffer pad are sleeved on the outside of the guide rod. The upper buffer pad is located between the upper end of the inner air spring and the upper boss, and the lower buffer pad is located between the lower end of the inner air spring and the lower boss.

[0006] In this embodiment, the upper and lower ends of the internal air spring are sealed to the bottom of the upper connecting seat and the top of the lower connecting seat respectively through sealing pressure rings.

[0007] As a preferred embodiment of this utility model, the upper and lower ends of the inner air spring are respectively sealed to the bottom of the upper connecting seat and the top of the lower connecting seat through sealing pressure rings. The sealing pressure rings are used to achieve the seal between the upper and lower ends of the inner air spring and the connecting seat, ensuring airtightness.

[0008] As a preferred embodiment of this utility model, the guide rod, the inner air spring, and the outer air spring are located on the same axis, which makes the force flow transmission direct, avoids eccentricity and additional bending moment, ensures that each component is subjected to uniform force, operates stably, and has minimal wear.

[0009] As a preferred embodiment of this utility model, the damper provides the necessary damping force, and the output end and bottom of the damper are respectively provided with protrusions.

[0010] As a preferred embodiment of this utility model, a pair of rectangular strips are provided on one side of the upper connecting seat, and the protrusion located at the output end of the damper is disposed between the pair of rectangular strips.

[0011] As a preferred embodiment of this utility model, a pair of rectangular plates are provided on one side of the lower connecting seat, and a protrusion located at the bottom of the damper is disposed between the pair of rectangular plates.

[0012] As a preferred embodiment of this utility model, the upper and lower ends of the internal air spring are respectively sealed and connected to the guide rod, which further enhances the sealing reliability of the internal air spring chamber and forms an independent air chamber with the guide rod as the axis.

[0013] As a preferred embodiment of this utility model, both the outer air spring and the inner air spring are composite structures of nitrile rubber and cord, forming the material of the air spring bladder. Nitrile rubber provides excellent airtightness, oil resistance and aging resistance. The cord is embedded in the rubber, providing extremely high tensile strength, withstanding the internal air pressure, limiting the radial expansion of the rubber bladder, and causing it to mainly undergo axial deformation.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. In this utility model, the outer air spring can undertake the main load and the attenuation of low-frequency large-amplitude vibration, while the inner air spring focuses on the buffering of high-frequency small-amplitude vibration. The two work together to achieve full coverage of "low-frequency stable load + high-frequency vibration damping", which solves the problem of poor adaptability of traditional single air springs to complex working conditions. It is especially suitable for scenarios such as automobiles and industrial equipment where multiple vibration frequencies alternate.

[0015] 2. In this utility model, the guide rod can effectively limit the lateral displacement of the upper and lower connecting seats, avoiding "tilting" during vibration. The upper and lower buffer pads can provide secondary buffering when the inner air spring is over-compressed, preventing direct collision between the connecting seat and the inner air spring. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the dual air spring vibration damper of this utility model; Figure 2 This is a top view schematic diagram of the dual air spring vibration damper of this utility model; Figure 3 This is a schematic diagram of the internal structure of the dual air spring vibration damper of this utility model; Figure 4 This is a schematic diagram of the guide rod structure of this utility model.

[0017] In the diagram: 1. Lower connecting seat; 101. Rectangular plate; 102. Lower boss; 103. Sliding bearing; 2. Upper connecting seat; 201. Rectangular strip; 202. Upper boss; 3. External air spring; 4. Damper; 401. Protrusion; 5. Internal air spring; 6. Guide rod; 601. Upper buffer pad; 602. Lower buffer pad. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0019] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, and several embodiments of the utility model will be provided. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and complete.

[0020] For examples, please refer to Figure 1-4 This utility model provides a technical solution: A dual air spring vibration damper includes a lower connecting seat 1, an upper connecting seat 2, and a damper 4. The lower connecting seat 1 and the upper connecting seat 2 serve as the mounting base and load-bearing structure for the entire vibration damper. The lower connecting seat 1 is typically connected to the foundation (such as a vehicle frame or foundation) requiring vibration damping, while the upper connecting seat 2 is connected to the equipment or vehicle body being protected. An external air spring 3 is provided between the lower connecting seat 1 and the upper connecting seat 2. The external air spring 3 serves as the main damping element, bearing most of the load and providing the main elastic support and low-frequency vibration isolation. The bottom of the upper connecting seat 2 is equipped with... The upper boss 202 is used to install and position the top of the guide rod 6. The bottom end of the upper boss 202 is equipped with the guide rod 6, which provides precise axial guidance for the entire vibration damping system and serves as the mounting mandrel for the inner air spring 5. This ensures that the inner and outer air springs 3 only undergo axial deformation during compression and rebound, preventing them from twisting, bulging, or being damaged due to lateral forces, thus greatly extending their service life. The guide rod 6 is equipped with the inner air spring 5, which is located inside the outer air spring 3. The inner air spring 5 and... The external air springs 3 work in parallel as secondary damping elements. The top of the lower connecting seat 1 has a lower boss 102, and the bottom of the lower connecting seat 1 has a sliding bearing 103. The sliding bearing 103 acts as a low-friction sliding pair, reducing friction and allowing the guide rod 6 to slide smoothly up and down while bearing radial force, ensuring smooth movement and preventing jamming. The guide rod 6 passes through the lower boss 102 and is fitted into the sliding bearing 103. The lower boss 102 and the sliding bearing 103 cooperate to provide support and guidance for the bottom of the guide rod 6. The outer casing is fitted with an upper buffer pad 601 and a lower buffer pad 602. The upper buffer pad 601 is located between the upper end of the inner air spring 5 and the upper boss 202, and the lower buffer pad 602 is located between the lower end of the inner air spring 5 and the lower boss 102. The upper buffer pad 601 and the lower buffer pad 602 serve as mechanical limits and final safety buffers. When the shock absorber is subjected to extreme impact and the air spring is compressed to its limit position, the buffer pads undergo elastic deformation to absorb the remaining impact energy and prevent the metal parts guide rod 6 and connecting seat from undergoing rigid collisions and causing damage.

[0021] As a preferred embodiment of this utility model, the upper and lower ends of the inner air spring 5 are respectively sealed to the bottom of the upper connecting seat 2 and the top of the lower connecting seat 1 through sealing pressure rings. The sealing pressure rings are used to achieve the sealing between the upper and lower ends of the inner air spring 5 and the connecting seats to ensure airtightness.

[0022] As a preferred embodiment of this utility model, the guide rod 6, the inner air spring 5, and the outer air spring 3 are located on the same axis, which makes the force flow transmission direct, avoids eccentricity and additional bending moment, ensures that each component is subjected to uniform force, operates stably, and has minimal wear.

[0023] As a preferred embodiment of this utility model, the damper 4 provides the necessary damping force, and the output end and bottom of the damper 4 are respectively provided with protrusions 401.

[0024] As a preferred embodiment of this utility model, a pair of rectangular strips 201 are provided on one side of the upper connecting seat 2, and the protrusion 401 located at the output end of the damper 4 is disposed between the pair of rectangular strips 201.

[0025] As a preferred embodiment of this utility model, a pair of rectangular plates 101 are provided on one side of the lower connecting seat 1, and the protrusion 401 located at the bottom of the damper 4 is disposed between the pair of rectangular plates 101.

[0026] As a preferred embodiment of this utility model, the upper and lower ends of the inner air spring 5 are respectively sealed to the guide rod 6, which further enhances the sealing reliability of the air chamber of the inner air spring 5 and forms an independent air chamber with the guide rod 6 as the axis.

[0027] As a preferred embodiment of this utility model, both the outer air spring 3 and the inner air spring 5 are composite structures of nitrile rubber and cord, forming the material of the air spring bladder. Nitrile rubber provides excellent air tightness, oil resistance and aging resistance. The cord is embedded in the rubber, providing extremely high tensile strength, withstanding the internal air pressure, limiting the radial expansion of the rubber bladder, and causing it to mainly undergo axial deformation.

[0028] In this embodiment The working process of this utility model is as follows: When the load (equipment or vehicle body) is stationary, it presses on the upper connecting seat 2 and the force is transmitted to the outer air spring 3 and the inner air spring 5. The compressed air inside the two springs is further compressed, generating a reverse force to support the load.

[0029] When encountering an upward impact (such as a wheel running over a protrusion): the lower connecting seat 1 moves upward rapidly, compressing the outer air spring 3 and the inner air spring 5. The air inside the springs is compressed, the pressure increases, absorbing the impact energy and transforming the violent impact into a gentle, controllable displacement.

[0030] When encountering a downward impact (such as a wheel falling into a pothole): the load tends to move downwards, the shock absorber is stretched, and at this time the air inside the spring expands, the pressure decreases, and it will also absorb energy and prevent the load from falling suddenly.

[0031] At the same time, it will push the protrusions 401 at both ends of the damper 4, forcing the piston inside the damper 4 to move, pushing the oil from one chamber through the small hole or valve into another chamber. When the oil passes through the small hole, it generates huge fluid resistance, converting the mechanical energy of the vibration into heat energy and dissipating it, thereby completing the vibration reduction.

[0032] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0033] 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 dual air spring vibration damper, comprising a lower connecting seat (1) and an upper connecting seat (2), characterized in that: An external air spring (3) is provided between the lower connecting seat (1) and the upper connecting seat (2); The bottom of the upper connecting seat (2) is provided with an upper boss (202), and the bottom end of the upper boss (202) is provided with a guide rod (6). An inner air spring (5) is provided on the guide rod (6), and the inner air spring (5) is located inside the outer air spring (3). The lower connecting seat (1) has a lower boss (102) at its top and a sliding bearing (103) at its bottom. The guide rod (6) passes through the lower boss (102) and is fitted into the sliding bearing (103). The guide rod (6) is fitted with an upper buffer pad (601) and a lower buffer pad (602). The upper buffer pad (601) is located between the upper end of the inner air spring (5) and the upper boss (202), and the lower buffer pad (602) is located between the lower end of the inner air spring (5) and the lower boss (102).

2. The dual air spring vibration damper according to claim 1, characterized in that: The upper and lower ends of the internal air spring (5) are sealed to the bottom of the upper connecting seat (2) and the top of the lower connecting seat (1) respectively through sealing pressure rings.

3. The dual air spring vibration damper according to claim 1, characterized in that: The guide rod (6), the inner air spring (5), and the outer air spring (3) are located on the same axis.

4. A dual air spring vibration damper according to claim 1, characterized in that: It also includes a damper (4), the output end and the bottom of which are respectively provided with a protrusion (401).

5. A dual air spring vibration damper according to claim 4, characterized in that: A pair of rectangular bars (201) are provided on one side of the upper connecting seat (2), and the protrusion (401) at the output end of the damper (4) is arranged between the pair of rectangular bars (201).

6. A dual air spring vibration damper according to claim 4, characterized in that: A pair of rectangular plates (101) are provided on one side of the lower connecting seat (1), and a protrusion (401) located at the bottom of the damper (4) is disposed between the pair of rectangular plates (101).

7. A dual air spring vibration damper according to claim 1, characterized in that: The upper and lower ends of the internal air spring (5) are respectively sealed to the guide rod (6).

8. A dual air spring vibration damper according to claim 1, characterized in that: Both the external air spring (3) and the internal air spring (5) are composite structures of nitrile rubber and cord.

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