Shock absorber working cylinder

Abstract

The utility model discloses a shock absorber working cylinder which comprises a working cylinder body, the inner surface of the working cylinder body sequentially comprises a uniform rough surface layer formed through preliminary honing, a hard chromium plating layer covering the uniform rough surface layer and a fine honing chromium plating layer located on the surface of the hard chromium plating layer, and the hardness of the fine honing chromium plating layer is larger than or equal to 800 HV. The surface roughness Ra is 0.1-0.4 micrometer, the roundness tolerance is smaller than or equal to 0.01 mm, and the straightness tolerance is smaller than or equal to 0.015 mm / 100 mm. Through the multi-layer structural design, the hardness, the surface smoothness and the geometric accuracy of the inner wall of the working cylinder are remarkably improved, friction force and abrasion are reduced, the service life is prolonged, and the durability of the working cylinder of the shock absorber is improved.

Description

Technical Field

[0001] This utility model relates to the field of vibration damper technology, and in particular to a vibration damper operation. Background Technology

[0002] The working cylinders of the shock absorbers used in the past almost all used low-carbon welded or cold-drawn steel pipes. Whether it is a welded or cold-drawn steel pipe, it can achieve excellent inner surface roughness, roundness and straightness. For pistons with rubber coating process and ordinary shock absorber oil usage environment, the friction between the cylinder wall and piston is very small. The cylinder wall often does not require additional treatment and the original pipe surface is used directly as the working surface.

[0003] Because the piston rings are made of plastic sheets, it is difficult to achieve high precision with consistent thickness. Therefore, after the piston rings are installed in the vibration damper, the frictional dispersion will be relatively large. In this case, it is necessary to improve the friction coefficient and friction resistance of the working cylinder wall.

[0004] For shock absorbers that use non-pure oil fluids, especially particulate mixtures such as magnetorheological fluids, the requirements for friction performance of the inner wall of the shock absorber's working cylinder are further increased. Utility Model Content

[0005] The purpose of this invention is to provide a durable shock absorber working cylinder with a long service life.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a shock absorber working cylinder, comprising a working cylinder body, the inner surface of which sequentially comprises a uniform rough surface layer formed by preliminary honing, a hard chrome plating layer covering the uniform rough surface layer, and a finely honed chrome plating layer located on the surface of the hard chrome plating layer. The hardness of the finely honed chrome plating layer is ≥800HV, the surface roughness Ra is 0.1μm-0.4μm, the roundness tolerance is ≤0.01mm, and the straightness tolerance is ≤0.015mm / 100mm.

[0007] In one embodiment, the roughness Ra of the uniform rough surface layer is 0.4μm-0.8μm, the roundness tolerance is ≤0.02mm, and the straightness tolerance is ≤0.03mm / 100mm.

[0008] In one embodiment, the thickness of the hard chromium plating layer is 10μm-50μm, and the surface hardness is ≥800HV.

[0009] In one embodiment, the surface of the hard chromium plating layer is uniformly distributed with microcracks with a width of 0.1 μm to 2 μm.

[0010] In one embodiment, the bonding strength between the hard chrome plating layer and the working cylinder body is ≥20MPa.

[0011] In one embodiment, the coefficient of friction of the finely honed chromium plating layer is ≤0.12.

[0012] In one embodiment, the inner hole size tolerance of the finely honed chromium plating layer is ±0.005 mm.

[0013] In one embodiment, the surface of the finely honed chromium plating layer is uniformly distributed with micro-pit structures for storing lubricating medium, and the pit depth is 0.5μm-2μm.

[0014] In one embodiment, the working cylinder body is a low-carbon welded steel pipe working cylinder body or a cold-drawn steel pipe working cylinder body.

[0015] In one embodiment, the clearance between the inner surface of the working cylinder body and the piston ring is 0.05mm-0.15mm.

[0016] By adopting the above technical solution, this utility model has the following advantages:

[0017] 1. In this utility model, the multi-layer structure design significantly improves the hardness, surface smoothness and geometric accuracy of the inner wall of the working cylinder, reduces friction and wear, extends service life and improves the durability of the shock absorber working cylinder.

[0018] 2. Preliminary honing creates a uniformly rough surface layer, which provides a uniform substrate for subsequent chrome plating, ensuring consistent plating thickness and bonding strength.

[0019] 3. High hardness and wear resistance are provided by conventional hard chrome plating, which meets the requirements of ordinary shock absorber oil environment.

[0020] 4. By setting microcracks, the adhesion of the coating is enhanced, preventing the coating from peeling off, and making it more suitable for environments with high particulate matter mixtures such as magnetorheological fluids.

[0021] 5. High bonding strength prevents coating peeling, ensuring long-term reliability and durability.

[0022] 6. By reducing the frictional dispersion between the piston rings and the cylinder wall through a low coefficient of friction, the working stability of the shock absorber is improved.

[0023] 7. High-precision dimensional control reduces jerking during vibration damper operation and lowers the risk of component wear.

[0024] 8. By setting up a micro-dimple structure, the ability to retain lubricating medium is improved, further reducing friction and wear.

[0025] 9. High-precision steel pipes are used as the base material to ensure initial processing accuracy and reduce the difficulty of subsequent processing.

[0026] 10. By optimizing the fit clearance, the friction and sealing performance are balanced, thus extending the life of the piston rings. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] Figure 1 This is a schematic diagram of the working cylinder of the shock absorber described in this utility model.

[0029] Figure 2 This is a cross-sectional view of the working cylinder of the shock absorber described in this utility model.

[0030] Figure 3 This is a partially enlarged cross-sectional view of the working cylinder of the shock absorber described in this utility model.

[0031] Figure 4 for Figure 3 A magnified view of A in the middle.

[0032] The names of the components shown in the diagram are as follows:

[0033] 100. Shock absorber working cylinder; 10. Working cylinder body; 20. Uniform rough surface layer; 30. Hard chrome plating layer; 40. Finely honed chrome plating layer; 401. Dent. Detailed Implementation

[0034] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0035] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0036] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0038] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] like Figures 1 to 4 As shown, this utility model provides a shock absorber working cylinder 100, which includes a working cylinder body 10. The inner surface of the working cylinder body 10 sequentially includes a uniform rough surface layer 20 formed by preliminary honing, a hard chrome plating layer 30 covering the uniform rough surface layer 20, and a finely honed chrome plating layer 40 located on the surface of the hard chrome plating layer 30. The hardness of the finely honed chrome plating layer 40 is ≥800HV, the surface roughness Ra is 0.1μm-0.4μm, the roundness tolerance is ≤0.01mm, and the straightness tolerance is ≤0.015mm / 100mm. Through the multi-layer structure design, the hardness, surface smoothness and geometric accuracy of the inner wall of the working cylinder are significantly improved, friction and wear are reduced, service life is extended, and the durability of the shock absorber working cylinder is improved.

[0040] In some embodiments, the roughness Ra of the uniform rough surface layer 20 can be 0.4μm-0.8μm, the roundness tolerance ≤0.02mm, and the straightness tolerance ≤0.03mm / 100mm. The uniform rough surface layer is formed by preliminary honing, which can provide a uniform substrate for subsequent chromium plating and ensure the consistency of plating thickness and bonding strength.

[0041] In some embodiments, the thickness of the hard chrome plating layer 30 can be 10μm-50μm, and the surface hardness can be ≥800HV. High hardness and wear resistance can be provided by conventional hard chrome plating layer to meet the requirements of ordinary shock absorber oil environment.

[0042] In some embodiments, the surface of the hard chromium plating layer 30 can be uniformly distributed with microcracks with a width of 0.1μm-2μm. By setting microcracks, the adhesion of the plating layer is enhanced, the plating layer is prevented from peeling off, and it is better suited for environments with high particulate matter mixtures such as magnetorheological fluids.

[0043] In some embodiments, the bonding strength between the hard chrome plating layer 30 and the working cylinder body 10 can be ≥20 MPa. The high bonding strength prevents the plating layer from peeling off, ensuring long-term reliability and durability.

[0044] In some embodiments, the friction coefficient of the finely honed chromium plating layer 40 can be ≤0.12, thereby reducing the frictional dispersion between the piston ring and the cylinder wall and improving the working stability of the shock absorber.

[0045] In some embodiments, the inner hole size tolerance of the finely honed chromium plating layer 40 can be ±0.005mm. High-precision dimensional control can reduce the jerking phenomenon during the operation of the damper and reduce the risk of wear on the parts.

[0046] In some embodiments, the surface of the finely honed chromium plating layer can be uniformly distributed with micro-pit structures for storing lubricating medium. The micro-pit structure consists of multiple pits 401 covering the surface of the finely honed chromium plating layer 40, with a depth of 0.5μm-2μm. By setting the micro-pit structure, the lubricating medium retention capacity can be improved, and friction and wear can be further reduced.

[0047] In some embodiments, the working cylinder body 10 can be a low-carbon welded steel pipe working cylinder body or a cold-drawn steel pipe working cylinder body, using high-precision steel pipe as the base material to ensure initial processing accuracy and reduce the difficulty of subsequent processing.

[0048] In some embodiments, the mating clearance between the inner surface of the working cylinder body 10 and the piston ring can be 0.05mm-0.15mm. By optimizing the mating clearance, friction and sealing performance can be balanced, and the life of the piston ring can be extended.

[0049] In addition to the preferred embodiments described above, the technical solutions protected by this utility model are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this utility model. Although this utility model has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A shock absorber working cylinder, characterized in that, The device includes a working cylinder body. The inner surface of the working cylinder body includes, in sequence, a uniform rough surface layer formed by preliminary honing, a hard chrome plating layer covering the uniform rough surface layer, and a finely honed chrome plating layer located on the surface of the hard chrome plating layer. The hardness of the finely honed chrome plating layer is ≥800HV, the surface roughness Ra is 0.1μm-0.4μm, the roundness tolerance is ≤0.01mm, and the straightness tolerance is ≤0.015mm / 100mm.

2. The shock absorber working cylinder according to claim 1, characterized in that, The roughness Ra of the uniform rough surface layer is 0.4μm-0.8μm, the roundness tolerance is ≤0.02mm, and the straightness tolerance is ≤0.03mm / 100mm.

3. The shock absorber working cylinder according to claim 1, characterized in that, The thickness of the hard chromium plating layer is 10μm-50μm, and the surface hardness is ≥800HV.

4. The shock absorber working cylinder according to claim 1, characterized in that, The surface of the hard chromium plating layer is uniformly distributed with microcracks with a width of 0.1μm-2μm.

5. The shock absorber working cylinder according to claim 1, characterized in that, The bonding strength between the hard chrome plating layer and the working cylinder body is ≥20MPa.

6. The shock absorber working cylinder according to claim 1, characterized in that, The coefficient of friction of the finely honed chromium plating layer is ≤0.

12.

7. The shock absorber working cylinder according to claim 1, characterized in that, The inner hole size tolerance of the finely honed chromium plating layer is ±0.005mm.

8. The shock absorber working cylinder according to claim 1, characterized in that, The surface of the finely honed chromium plating layer is uniformly distributed with micro-pit structures for storing lubricating medium, and the pit depth is 0.5μm-2μm.

9. The shock absorber working cylinder according to any one of claims 1 to 8, characterized in that, The working cylinder body is a low-carbon welded and drawn steel pipe working cylinder body or a cold-drawn steel pipe working cylinder body.

10. The shock absorber working cylinder according to any one of claims 1 to 8, characterized in that, The clearance between the inner surface of the working cylinder body and the piston ring is 0.05mm-0.15mm.

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