Piston filling device of air spring

Abstract

The utility model provides a piston filling device of an air spring, which is characterized in that a piston is in a hollow column shape, a filling block is plugged into a hollow cavity of the piston, the filling block and the cavity of the piston are installed in an interference fit mode, and the filling block and the piston are mutually positioned. An interference press-fitting ring is specially arranged on the periphery of a filling block in a sleeving mode, and the two side faces of an annular structure are pressed and fixed to the inner edge face of a piston and the outer edge face of the filling block correspondingly so that it can be guaranteed that the position of the filling block is stable and not prone to disengagement during normal work. Through the filling block, the actual working volume in the air spring piston can be freely and conveniently changed, only the corresponding filling block needs to be replaced, the piston structure does not need to be redesigned, the research and development experiment cost is greatly saved, and the working efficiency is improved. And the filling block is made of a relatively elastic material, so that certain piston buffering can be provided, the working noise is reduced, and the technical problem that an air spring piston part is difficult to meet the requirement for diversity of automobile product models is solved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and more specifically, to a piston filling device for an air spring. Background Technology

[0002] Air springs are made by filling a sealed container with compressed air, utilizing the compressibility of gas to achieve their elastic effect. Air springs have ideal non-linear elastic characteristics. With the addition of a height adjustment device, the vehicle height does not change with the increase or decrease of load. The spring stiffness can be designed to be lower, resulting in good ride comfort. However, air spring suspension structures used in automobiles are currently complex and have high manufacturing costs.

[0003] For existing air springs developed for different models or new and modified models of the same series and platform, the internal volume of the air spring piston often needs to be adjusted due to the adjustment of air spring load and the change of target stiffness. However, adjusting the piston shape, size, wall thickness and other characteristics by redesigning the piston parts will bring other problems, such as requiring a lot of time for various reliability verifications, changes and improvements in manufacturing processes, increased costs, and lack of interchangeability of parts between different projects.

[0004] In summary, existing air spring piston components have technical problems in adapting to the diverse requirements of different automotive product models. Utility Model Content

[0005] The technical problem to be solved by this utility model is that existing air spring piston components are difficult to adapt to the diverse requirements of automobile product models.

[0006] To solve the above problems, this utility model provides a piston filling device for an air spring, including a hollow cylindrical piston and a filling block. The outer edge of the filling block is cylindrical and is interference-fitted with the middle cavity of the piston. An interference fit ring is fitted on one end of the outer periphery of the filling block corresponding to the large end of the piston. The filling block is fixed in a preset position in the middle cavity of the piston by the interference fit ring.

[0007] This utility model provides a structural design for filling an air spring piston. The air spring piston itself is a hollow cylindrical shape. A filling block is inserted into the hollow cavity of the piston. The filling block and the piston cavity are installed with an interference fit. To ensure the mutual positioning between the filling block and the piston, an interference fit ring is specially fitted on the outer periphery of the filling block. The two sides of this ring structure are pressed and fixed between the inner edge of the piston and the outer edge of the filling block, respectively, to ensure the stability of the filling block and prevent it from dislodging during normal operation. The actual working volume inside the air spring piston can be changed relatively freely and conveniently by simply changing the size of the filling block. There is no need to redesign the piston structure, which greatly saves research and development costs. In addition, the filling block is made of a relatively elastic material, which can also provide a certain piston cushioning and reduce working noise. This effectively solves the technical problem that existing air spring piston components are difficult to adapt to the diverse requirements of automotive product models.

[0008] As a preferred embodiment, a venting groove is provided on the outer edge of the filler block in a direction parallel to the piston axis, and the two ends of the venting groove connect to the two end faces of the filler block. This design optimizes the filler block structure by providing a venting groove on the outer edge of the filler block, with the venting groove extending parallel to the piston axis, to connect the spaces where the end faces of the filler block are located. This structure can guide the airflow within the air spring during stretching and compression, reducing abnormal noises caused by air bursts during air spring operation.

[0009] As a preferred embodiment, the inner periphery of the interference fit ring is provided with an arc-shaped groove structure at the position corresponding to the vent groove, for reserving an air passage for the vent groove. Based on the above structure, an arc-shaped groove structure is further provided on the inner periphery of the interference fit ring located outside the filler block. This structure is positioned corresponding to the vent groove, thus reserving an air passage with greater space thickness in conjunction with the vent groove.

[0010] As a preferred embodiment, the outer periphery of the interference fit ring is provided with an acute-angled chamfered surface, and the sidewall thickness of the piston at one end corresponding to the interference fit ring is in the range of 3mm-5mm. An annular trapezoidal groove is provided on the end face of the piston at this end. This design optimizes the piston end design for the interference fit insertion method between the filler block and the piston. The wall thickness of the piston at one end of the interference fit ring, i.e., the distance between the piston's outer surface and inner cavity, is in the range of 3mm-5mm, with 4mm being the optimal choice. A groove is provided on the end face of this end, the groove having a trapezoidal cross-section and a shape that matches the piston end face shape in an annular shape.

[0011] As a preferred embodiment, the thickness of the interference fit ring ranges from 3.5mm to 4.0mm. This design optimizes the interference fit ring structure, preferably using 45# steel with a thickness ranging from 3.5mm to 4.0mm, and most preferably 3.7mm. This design ensures a good interference fit effect.

[0012] As a preferred embodiment, the filler block has two symmetrically distributed vent grooves on its outer periphery, and the inner periphery of the interference fit ring also has two arc-shaped groove structures at positions corresponding to the vent grooves. This design further optimizes the design of the vent grooves on the filler block, and the two vent grooves ensure the ventilation effect.

[0013] As a preferred embodiment, the width of the vent groove in the filling block is consistent with the width of the arc-shaped groove structure on the inner periphery of the interference fit ring, with both groove widths ranging from 7mm to 9mm, and the groove depth ranging from 3mm to 5mm. This design optimizes the dimensions of the vent groove. The groove width and depth design effectively ensure that the venting effect meets the requirements of guiding airflow without affecting normal piston operation. The optimal selection is a groove depth of 4mm and a groove width of 7mm.

[0014] As a preferred embodiment, the acute-angled chamfered surface of the outer periphery of the interference fit ring has an angle range of 15°-25°. This design optimizes the structure of the interference fit ring by providing a chamfered surface with an angle range of 15°-25° on the outer periphery of the interference fit ring to meet the requirements of interference fit, with the optimal chamfered surface angle being 20°.

[0015] As a preferred embodiment, the filler block is a one-piece molded rubber structure. Using rubber for the filler block makes it lighter and more elastic, providing cushioning for the piston and reducing noise from the air spring. Attached Figure Description

[0016] Figure 1 A schematic cross-sectional view of the piston filling device for an air spring provided by this utility model;

[0017] Figure 2 for Figure 1 A partial cross-sectional structural diagram of the piston filling device;

[0018] Figure 3 for Figure 1 A schematic diagram of the piston structure of the piston filling device;

[0019] Figure 4 for Figure 1 A schematic diagram of the filling block and interference fit ring of the piston filling device.

[0020] in, Figures 1-4 middle:

[0021] 1. Piston; 2. Filler block; 2-1. Vent groove; 2-2. Trapezoidal groove; 3. Interference fitting ring; 3-1. Arc-shaped groove structure; 3-2. Acute chamfered surface. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Before providing a detailed explanation of the working principle of this utility model, further clarification is needed regarding its description: In this description, terms such as "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a welded connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] refer to Figures 1-4 The following examples illustrate this. Figure 1 A schematic cross-sectional view of the piston filling device for an air spring provided by this utility model; Figure 2 for Figure 1 A partial cross-sectional structural diagram of the piston filling device; Figure 3 for Figure 1 A schematic diagram of the piston structure of the piston filling device; Figure 4 for Figure 1 A schematic diagram of the filling block and interference fit ring of the piston filling device.

[0026] The piston filling device for an air spring provided in this embodiment includes a hollow cylindrical piston 1 and a filling block 2. The outer edge of the filling block 2 is cylindrical and is interference-fitted with the middle cavity of the piston 1. An interference-fitting ring 3 is sleeved on the outer periphery of the filling block 2 at one end corresponding to the large end of the piston 1. The filling block 2 is fixed in a preset position in the middle cavity of the piston 1 by the interference-fitting ring 3.

[0027] This utility model provides a structural design for filling an air spring piston. The air spring piston itself is a hollow cylindrical shape. A filling block 2 is inserted into the hollow cavity of the piston 1. The filling block 2 and the cavity of the piston 1 are installed with an interference fit. To ensure that the filling block 2 and the piston 1 are positioned relative to each other, an interference fit ring 3 is specially fitted on the outer periphery of the filling block 2. The two sides of the ring structure are pressed and fixed between the inner edge of the piston 1 and the outer edge of the filling block 2 to ensure that the filling block 2 is stable and does not easily come off during normal operation. The actual working volume inside the air spring piston can be changed relatively freely and conveniently by simply changing the size of the filling block 2. There is no need to redesign the piston structure, which greatly saves the research and development cost. In addition, the filling block 2 is made of a relatively elastic material, which can also provide a certain piston buffer and reduce working noise. This effectively solves the technical problem that existing air spring piston parts are difficult to adapt to the diverse requirements of automotive product models.

[0028] In the technical solution provided in this embodiment, a venting groove 2-1 is provided on the outer edge of the filler block 2 in a direction parallel to the axial direction of the piston 1, and the two ends of the venting groove 2-1 are connected to the two end faces of the filler block 2. This design optimizes the structural design of the filler block 2. The venting groove 2-1 is provided on the outer edge of the filler block 2, and the extension direction of the venting groove 2-1 is parallel to the axial direction of the piston 1, so as to connect the space where the end faces of the two ends of the filler block 2 are located. This structure can guide the airflow in the air spring when the air spring is stretched and compressed, and reduce the abnormal noise generated by the air explosion when the air spring is working.

[0029] In the technical solution provided in this embodiment, an arc-shaped groove structure 3-1 is provided on the inner periphery of the interference fit ring 3 at the position corresponding to the vent groove 2-1, for reserving an air passage for the vent groove 2-1. Based on the above structure, an arc-shaped groove structure 3-1 is further provided on the inner periphery of the interference fit ring 3 located outside the filler block 2. The position of this structure corresponds to the vent groove 2-1, and it cooperates with the vent groove 2-1 to reserve an air passage with a larger space thickness.

[0030] In the technical solution provided in this embodiment, the outer periphery of the interference fit ring 3 is provided with an acute-angled chamfered surface 3-2. The sidewall thickness of the piston 1 at one end corresponding to the interference fit ring 3 is in the range of 3mm-5mm. The end face of the piston 1 at this end is provided with an annular trapezoidal groove 2-2. This design optimizes the end design of the piston 1 for the interference fit insertion method between the filler block 2 and the piston 1. The wall thickness of the piston 1 at one end of the interference fit ring 3, that is, the distance between the outer surface and the inner cavity of the piston 1, is in the range of 3mm-5mm, with 4mm being the optimal choice. A groove is provided on the end face of this end. The cross-section of the groove is trapezoidal and its shape matches the shape of the piston end face in an annular shape.

[0031] In the technical solution provided in this embodiment, the thickness of the interference fit ring 3 ranges from 3.5mm to 4.0mm. This design optimizes the structure of the interference fit ring 3, preferably using 45# steel with a thickness ranging from 3.5mm to 4.0mm, and most preferably 3.7mm. This design can ensure a good interference fit effect.

[0032] In the technical solution provided in this embodiment, two venting grooves 2-1 are symmetrically distributed on the outer periphery of the filling block 2, and two arc-shaped groove structures 3-1 are also provided on the inner periphery of the interference fit ring 3 at the corresponding positions of the venting grooves 2-1. This design further optimizes the design of the venting grooves 2-1 on the filling block 2, and the two venting grooves 2-1 ensure the ventilation effect.

[0033] In the technical solution provided in this embodiment, the width of the vent groove 2-1 of the filler block 2 is consistent with the width of the arc-shaped groove structure 3-1 on the inner periphery of the interference fit ring 3, and the width of both grooves ranges from 7mm to 9mm. The depth of the vent groove 2-1 ranges from 3mm to 5mm. This design optimizes the dimensions of the vent groove 2-1. The groove width and depth design can effectively ensure that the ventilation effect meets the requirements of guiding airflow without affecting the normal piston operation. The optimal selection is a groove depth of 4mm and a groove width of 7mm.

[0034] In the technical solution provided in this embodiment, the angle range of the acute-angled chamfered surface 3-2 on the outer periphery of the interference fit ring 3 is 15°-25°. This design optimizes the structure of the interference fit ring 3. To meet the requirements of interference fit, a chamfered surface with an angle range of 15°-25° is set on the outer periphery of the interference fit ring 3, and the optimal chamfered surface angle is 20°.

[0035] In the technical solution provided in this embodiment, the filler block 2 is a one-piece molded rubber structure. The filler block 2 made of rubber is lighter and has good elasticity, which can dampen the piston and reduce abnormal noise during the operation of the air spring.

[0036] Although the disclosure is as stated above, the scope of protection of this disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. A piston filling device for an air spring, comprising a hollow cylindrical piston (1), characterized in that, It also includes a filler block (2), the outer edge of which is columnar and is press-fitted with the middle cavity of the piston (1). An interference fit ring (3) is fitted on the outer periphery of the filler block (2) at one end corresponding to the large end of the piston (1). The position of the filler block (2) is fixed in the middle cavity of the piston (1) by the interference fit ring (3).

2. The piston filling device for the air spring according to claim 1, characterized in that, The outer edge of the filling block (2) is provided with a venting groove (2-1) in a direction parallel to the axial direction of the piston (1), and the two ends of the venting groove (2-1) are connected to the two end faces of the filling block (2).

3. The piston filling device for the air spring according to claim 2, characterized in that, The inner periphery of the interference fit ring (3) is provided with an arc-shaped groove structure (3-1) at the position corresponding to the vent groove (2-1) to reserve the air passage of the vent groove (2-1).

4. The piston filling device for the air spring according to claim 3, characterized in that, The outer periphery of the interference fit ring (3) is provided with an acute-angled chamfered surface (3-2). The side wall thickness of the piston (1) at one end corresponding to the end of the interference fit ring (3) is in the range of 3mm-5mm. The piston (1) at this end is provided with an annular trapezoidal groove (2-2).

5. The piston filling device for the air spring according to claim 4, characterized in that, The thickness of the interference fit ring (3) ranges from 3.5mm to 4.0mm.

6. The piston filling device for the air spring according to claim 3, characterized in that, The filling block (2) has two venting grooves (2-1) symmetrically distributed on its outer periphery, and the inner periphery of the interference fit ring (3) is also provided with two arc-shaped groove structures (3-1) at the positions corresponding to the venting grooves (2-1).

7. The piston filling device for the air spring according to claim 6, characterized in that, The width of the venting groove (2-1) of the filling block (2) is consistent with the width of the arc-shaped groove structure (3-1) on the inner periphery of the interference fit ring (3), and the groove width ranges from 7mm to 9mm. The groove depth ranges from 3mm to 5mm.

8. The piston filling device for the air spring according to claim 4, characterized in that, The angle range of the acute chamfered surface (3-2) on the outer periphery of the interference fit ring (3) is 15°-25°.

9. The piston filling device for the air spring according to claim 1, characterized in that, The filler block (2) is a one-piece rubber molded structure.

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