Anti-rattling air spring piston structure

Abstract

The utility model discloses an anti -abnormal sound's air spring piston structure belongs to automobile piston field, including piston cylinder and setting on the piston rod of piston cylinder, the outer surface fixed sleeve of piston rod has the buffer block, the piston cylinder is close to the one end of buffer block and is provided with several layers outward bulge's boss, the outside fixed mounting of boss has the point -like block, the boss evenly or according to specific law distribution is in the piston cylinder and buffer block contact area, through the combination design of " boss + point -like block " to the surface contact of traditional piston and buffer block is converted into the dispersed point contact, from the structural level, fundamentally destroys the formation condition of vacuum adsorption airtight chamber, reduces the peeling sound of the aerodynamic effect, simultaneously, the progressive transmission of impact force is realized in the form of dispersed point contact, effectively prevent the vibration noise caused by the mutation of force, solve the core problem of the impact abnormal sound such as " bang " sound, " kuo don't " sound of easy production when the piston of existing and buffer block contact.

Description

Technical Field

[0001] This utility model belongs to the field of automotive piston technology, specifically relating to an air spring piston structure that resists abnormal noise. Background Technology

[0002] Air springs are a key component of modern vehicle suspension systems, consisting of an air spring, piston, and top cover. To prevent the air spring from being over-compressed and damaged during extreme compression strokes (such as when passing over large potholes or high-intensity impacts), an independent buffer block is usually installed inside the system. This buffer block is generally made of flexible foam materials such as polyurethane and is usually fitted onto the piston rod at the center of the piston or placed inside the piston cavity. Under normal operating conditions, the air spring inflates, and the piston and buffer block do not contact each other, with a certain gap between them. However, when the vehicle suspension is severely compressed, the piston moves upward with the axle (or wheel), causing the top of the piston (especially its central area) to contact and collide with the buffer block, providing final protection through the compression of the buffer block and preventing hard impacts on metal components.

[0003] Pistons with a flat top design are prone to producing dull "bang" or "clunk" sounds when they contact the buffer block. The main reasons are twofold: First, the surface contact and vacuum adsorption effect. When the flat piston top impacts the bottom of the buffer block, a momentary sealed cavity easily forms in the central circular hole area of ​​the buffer block. Under the impact force, air is rapidly expelled, and negative pressure is generated at the moment of separation, creating a "vacuum adsorption." When the buffer block's elastic restoring force breaks free from the adsorption force, a peeling sound is produced. Second, the impact force is concentrated and lacks buffering. The flat surface contact causes the impact force to be transmitted over a large area at the initial contact moment without a gradual transition. This hard, explosive surface contact is more likely to excite structural vibration and generate audible noise. This noise is transmitted through the structure to the vehicle body, seriously affecting the vehicle's NVH quality, giving passengers a harsh and unrefined feeling from the suspension system, and reducing overall comfort. Utility Model Content

[0004] The purpose of this invention is to provide an air spring piston structure that resists abnormal noise, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an air spring piston structure for preventing abnormal noise, comprising a piston cylinder and a piston rod disposed on the piston cylinder, wherein a buffer block is fixedly sleeved on the outer surface of the piston rod, and a plurality of outwardly protruding bosses are provided at one end of the piston cylinder near the buffer block, and dot-shaped blocks are provided on the outer side of the bosses.

[0006] Through the above technical solution, the dotted block can further refine the contact form between the boss and the buffer block, further disperse the contact between the boss and the buffer block, reduce the force-bearing area of ​​a single contact, avoid local stress concentration, and at the same time prolong the transition process of impact force transmission, further weaken the intensity of impact vibration, and help improve the anti-noise effect.

[0007] In a preferred embodiment, the bosses are evenly or according to a specific pattern distributed in the contact area between the piston cylinder and the buffer block.

[0008] Through the above technical solution, the evenly or regularly distributed bosses can ensure that the piston cylinder and the buffer block are subjected to balanced force when they come into contact, avoiding excessive local impact force due to uneven distribution of contact points. This not only ensures the stability of the buffering effect, but also effectively prevents the aggravation of local vibration and the generation of abnormal noise, and helps to extend the service life of the piston and the buffer block.

[0009] In a preferred embodiment, the cross-sectional shape of the boss can be circular, elliptical, polygonal, or strip-shaped, and its top end can be designed as a planar, spherical, or rounded corner structure to optimize contact stress.

[0010] Through the above technical solutions, the diverse cross-sectional shapes and top structure designs can be flexibly selected according to the load-bearing requirements, driving conditions and buffer block material characteristics of different vehicle models. By optimizing the contact stress distribution, it avoids excessive local stress that could lead to component wear or increased vibration. At the same time, it adapts to different impact transmission requirements, further improving the adaptability and reliability of noise resistance.

[0011] In a preferred embodiment, the dotted blocks may be designed to be raised or recessed.

[0012] Through the above technical solutions, the protruding or concave design can flexibly adapt to the impact transmission requirements of different vehicle suspension systems and the material characteristics of the buffer block: when using a protruding design, the contact points between the protrusion and the buffer block can be further refined through the protruding structure, reducing the force-bearing area of ​​a single contact and avoiding local stress concentration; when using a concave design, the concave structure can form a local deformation buffer space at the moment of contact, dispersing the transmission path of the impact force. At the same time, both designs can overcome the problem of traditional surface contact easily forming a vacuum adsorption sealed cavity, avoiding the generation of peeling sound from the structural level, and the appropriate design form can be selected according to the actual working conditions, improving the adaptability and reliability of the structure's anti-noise effect.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This novel air spring piston structure, designed to prevent abnormal noise, transforms the traditional surface contact between the piston and the buffer block into dispersed point contact through a combination of "protrusions + point blocks." This fundamentally disrupts the conditions for forming a vacuum adsorption sealed cavity at the structural level, reducing peeling noise caused by aerodynamic effects. At the same time, the dispersed point contact allows for the gradual transmission of impact force, effectively preventing vibration noise caused by sudden force changes. This solves the core problem of impact noises such as "bang" and "clunk" that are easily generated when the piston contacts the buffer block. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] In the diagram: 1. Piston cylinder; 2. Piston rod; 3. Buffer block; 4. Boss; 5. Dot block. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments.

[0018] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the concept of the present invention are all within the scope of protection claimed by the present invention.

[0019] Please see Figure 1 This utility model provides an air spring piston structure for preventing abnormal noise, including a piston cylinder 1 and a piston rod 2 disposed on the piston cylinder 1. A buffer block 3 is fixedly sleeved on the outer surface of the piston rod 2. Several layers of outwardly protruding bosses 4 are provided at one end of the piston cylinder 1 near the buffer block 3. Dot-shaped blocks 5 are provided on the outer side of the bosses 4. The dot-shaped blocks 5 can be convex or concave. The convex or concave design can flexibly adapt to the impact transmission requirements of different vehicle suspension systems and the material characteristics of the buffer block: when a convex design is used, the contact points between the boss and the buffer block can be further refined through the convex structure, reducing the force-bearing area of ​​a single contact and avoiding local stress concentration; when a concave design is used, the concave structure can form a local deformation buffer space at the moment of contact, dispersing the transmission path of the impact force. At the same time, both designs can overcome the problem of traditional surface contact easily forming a vacuum adsorption sealed cavity, avoiding the generation of peeling sound from the structural level, and the appropriate design form can be selected according to the actual working conditions, improving the adaptability and reliability of the structure's anti-abnormal noise effect.

[0020] Furthermore, the bosses 4 are evenly or regularly distributed within the contact area between the piston cylinder 1 and the buffer block 3. This even or regularly distributed distribution ensures balanced force distribution when the piston cylinder 1 and buffer block 3 are in contact, preventing excessive local impact due to uneven contact point distribution. This ensures the stability of the buffering effect, effectively prevents increased local vibration and abnormal noise, and extends the service life of the piston and buffer block 3. The cross-sectional shape of the bosses 4 can be circular, elliptical, polygonal, or strip-shaped, and its top can be designed as a flat, spherical, or rounded corner structure to optimize contact stress. The diverse cross-sectional shapes and top structure designs can be flexibly selected according to the load-bearing requirements, driving conditions, and material characteristics of the buffer block 3 for different vehicle models. By optimizing the contact stress distribution, it avoids excessive local stress leading to component wear or increased vibration, while also adapting to different impact transmission requirements, further improving the adaptability and reliability of noise reduction.

[0021] The working principle of this utility model is as follows: When a vehicle passes over a large pothole or is subjected to a high-intensity impact, and the suspension is severely compressed, the buffer block 3 will first contact the dotted blocks 5 on the outer surface of the boss 4. The dotted blocks 5 further disperse the contact points, achieving initial buffering and dispersion of the impact force, avoiding large-area hard contact. As the compression stroke deepens, the top of the boss 4 makes full contact with the buffer block 3. If the top of the boss is a spherical or rounded corner structure, the contact stress distribution can be optimized through the arc-shaped contact surface. If it is a planar structure, the force can be balanced through the evenly distributed bosses, and the impact force can be transmitted evenly. At the same time, it breaks the vacuum sealed cavity condition formed by traditional surface contact and reduces the peeling sound caused by "vacuum adsorption".

[0022] 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. An air spring piston structure for preventing abnormal noise, comprising a piston cylinder (1) and a piston rod (2) disposed on the piston cylinder (1), characterized in that: The piston rod (2) is fixedly sleeved with a buffer block (3), and the piston cylinder (1) is provided with several layers of outwardly protruding bosses (4) at one end near the buffer block (3), and dot-shaped blocks (5) are provided on the outer side of the bosses (4).

2. The anti-noise air spring piston structure according to claim 1, characterized in that: The protrusions (4) are evenly or according to a specific pattern distributed in the contact area between the piston cylinder (1) and the buffer block (3).

3. The anti-noise air spring piston structure according to claim 1, characterized in that: The cross-sectional shape of the boss (4) can be circular, elliptical, polygonal or strip-shaped, and its top can be designed as a planar, spherical or rounded corner structure to optimize contact stress.

4. The anti-noise air spring piston structure according to claim 1, characterized in that: The dotted blocks (5) can be designed to be raised or recessed.

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