Cylinder body assembly of wear-resistant hydraulic oil cylinder

Abstract

The utility model discloses a cylinder body assembly of a wear-resistant hydraulic oil cylinder, which relates to the technical field of hydraulic oil cylinders, and has the technical key points that the cylinder body assembly comprises a cylindrical cylinder body which is coaxially sleeved, and the cylinder body sequentially comprises an outer layer, a middle buffer layer and an inner wear-resistant layer from outside to inside; the outer layer and the middle buffer layer are connected in a meshed mode through the structure of the axial protrusions and the axial grooves. Honeycomb-shaped damping cavities which are annularly and uniformly distributed are formed in the middle buffer layer, and the damping cavities are hexagonal columnar cavities; a plurality of axial wear-resistant ribs are annularly and uniformly distributed on the inner wall of the inner wear-resistant layer; the utility model can ensure the wear resistance, improve the mechanical strength of the cylinder barrel and ensure the service life.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, and in particular to a cylinder body assembly for a wear-resistant hydraulic cylinder. Background Technology

[0002] As a crucial actuator in a hydraulic system, the performance of a hydraulic cylinder directly impacts the stability and reliability of the entire system. A hydraulic cylinder typically consists of key components such as the cylinder barrel, piston, and seals. Among these, the cylinder barrel, as the core component responsible for bearing pressure and transmitting power, makes the wear resistance and mechanical strength of its inner wall particularly important.

[0003] The wear resistance of the cylinder inner wall directly affects the service life and working efficiency of the hydraulic cylinder. During the operation of the hydraulic cylinder, frequent friction occurs between the piston and the cylinder inner wall. If the wear resistance of the cylinder inner wall is insufficient, it will lead to severe wear, which in turn affects the sealing performance and motion accuracy of the hydraulic cylinder. Furthermore, wear will increase the leakage of the hydraulic cylinder, reducing its working efficiency. Therefore, improving the wear resistance of the cylinder inner wall is an important consideration in the design of hydraulic cylinders.

[0004] Besides wear resistance, the mechanical strength of the cylinder barrel is also crucial. Hydraulic cylinders need to withstand significant pressure and impact during operation. If the cylinder barrel's mechanical strength is insufficient, deformation or even breakage can occur, leading to cylinder failure. Therefore, the selection of cylinder barrel materials, manufacturing processes, and structural design must fully consider the required mechanical strength.

[0005] Currently, some technologies have been developed to improve the wear resistance and mechanical strength of hydraulic cylinder barrels. For example, utility model patent CN202220033080.0 proposes a high-lubrication, wear-resistant cylinder barrel, which improves the wear resistance of the inner wall of the cylinder barrel through special design and material selection. However, although this cylinder barrel has achieved a significant improvement in wear resistance, it is relatively weak in terms of mechanical strength. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a cylinder body assembly for a wear-resistant hydraulic cylinder, which ensures wear resistance, improves the mechanical strength of the cylinder barrel, and guarantees service life.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A cylinder body assembly for a wear-resistant hydraulic cylinder includes a coaxially mounted cylindrical cylinder body. The cylinder body comprises, from the outside to the inside, an outer layer, a middle buffer layer, and an inner wear-resistant layer. The outer layer and the middle buffer layer are connected by an axially protruding and axially grooved interlocking structure. The middle buffer layer has a ring-shaped honeycomb damping cavity evenly distributed inside, and the damping cavity is a hexagonal columnar cavity. The inner wall of the inner wear-resistant layer has a ring-shaped evenly distributed plurality of axial wear-resistant protrusions to ensure wear resistance, improve the mechanical strength of the cylinder barrel, and ensure service life.

[0009] Preferably, the outer layer is made of 40Cr alloy steel with a tensile strength ≥800MPa; the middle buffer layer is made of 6061-T6 aluminum alloy or TC4 titanium alloy with a damping coefficient ≥0.15; and the inner wear-resistant layer is made of 38CrMoAlA nitrided steel with a surface hardness ≥HRC55 or a bimetallic composite bushing structure to ensure mechanical strength.

[0010] Preferably, the outer surface of the outer layer is provided with annular reinforcing ribs, the reinforcing ribs have a T-shaped cross-section, and the reinforcing ribs are integrally cast with the outer layer to improve mechanical strength.

[0011] Preferably, a wave-shaped transition structure layer is provided between the outer layer and the inner wear-resistant layer to further improve mechanical strength.

[0012] Preferably, the waveform transition structure layer is made of 0Cr18Ni9 stainless steel or 3J1 elastic alloy, which has a certain elasticity and improves the buffering capacity.

[0013] This utility model has the following beneficial effects:

[0014] To ensure wear resistance: The inner wear-resistant layer uses 38CrMoAlA nitrided steel with a surface hardness ≥ HRC55 or a bimetallic composite bushing structure. The high hardness effectively resists friction and wear with components such as the piston, extending the service life of the cylinder assembly. Its inner wall is provided with multiple annularly distributed axial wear-resistant ridges, which disperse wear, reduce excessive local wear, and improve wear resistance. In the second embodiment, a wave-shaped transition structure layer is provided between the outer and inner wear-resistant layers. This structure buffers and guides the piston during movement, reducing the impact and friction forces borne by the inner wear-resistant layer and lowering the degree of wear. The wave-shaped transition structure layer is made of 0Cr18Ni9 stainless steel or 3J1 elastic alloy. Both materials have good wear resistance and a certain degree of elasticity, maintaining structural stability and integrity, and enhancing wear resistance.

[0015] Enhanced Mechanical Strength: The outer layer is made of 40Cr alloy steel with a tensile strength ≥800MPa, capable of withstanding significant tensile and compressive forces, ensuring it is not easily deformed or cracked under the high pressure of the hydraulic system. The outer surface of the outer layer features T-shaped annular reinforcing ribs, integrally cast with the outer layer. These T-shaped reinforcing ribs increase the moment of inertia of the cross-section, improving bending and torsional resistance and enhancing the mechanical strength of the cylinder assembly. The intermediate buffer layer is made of 6061-T6 aluminum alloy or TC4 titanium alloy with a damping coefficient ≥0.15, possessing sufficient strength and good damping performance. It absorbs and disperses the impact force generated by piston movement, protecting the structural integrity of the cylinder assembly. Internally, it features uniformly distributed annular honeycomb damping cavities. The hexagonal columnar cavity design allows the intermediate buffer layer to distribute stress more evenly under impact, avoiding localized stress concentration and improving the mechanical strength of the cylinder assembly. The cylinder body, from the outside in, consists of an outer layer, an intermediate buffer layer, and an inner wear-resistant layer. The outer layer and the intermediate buffer layer are connected by an axial protrusion-groove structure. This layered structure and connection method enables each layer to work together and jointly withstand working pressure and impact. The outer layer provides the main support and strength, the middle buffer layer buffers and disperses stress, and the inner wear-resistant layer ensures wear resistance and enhances the overall mechanical strength of the cylinder assembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of the first embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional view of the second embodiment of the present invention.

[0019] In the figure: 1. Cylindrical cylinder body; 101. Outer layer; 102. Intermediate buffer layer; 103. Inner wear-resistant layer; 201. Axial protrusion; 202. Axial groove; 3. Wear-resistant ridge; 4. Reinforcing rib; 5. Wave-shaped transition structure layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] First embodiment

[0022] like Figure 1 As shown, a cylinder body assembly for a wear-resistant hydraulic cylinder includes a coaxially mounted cylindrical cylinder body 1. The cylinder body includes an outer layer 101, a middle buffer layer 102, and an inner wear-resistant layer 103 from the outside to the inside. The outer layer 101 and the middle buffer layer 102 are connected by an axial protrusion 201 and an axial groove 202. The middle buffer layer 102 has a ring-shaped honeycomb damping cavity with uniform distribution inside. The damping cavity is a hexagonal columnar cavity. The inner wall of the inner wear-resistant layer 103 has a ring-shaped plurality of uniformly distributed axial wear-resistant protrusions 3.

[0023] like Figure 1 As shown, the outermost layer 101, as the outermost structure of the cylinder assembly, mainly serves a supporting and protective function. It withstands external mechanical impacts, collisions, and some of the pressure generated during the operation of the hydraulic system, providing the basic structural strength for the entire cylinder assembly and protecting the internal structure from direct damage from the external environment. The outer layer 101 and the intermediate buffer layer 102 are connected by an axial protrusion 201 and an axial groove 202. This connection method not only increases the contact area between the two layers and improves the stability of the connection, but also effectively transmits force and stress, ensuring that the force borne by the outer layer 101 is evenly transmitted to the intermediate buffer layer 102, thus guaranteeing the integrity of the entire cylinder assembly structure. The intermediate buffer layer 102 contains uniformly distributed annular honeycomb-shaped damping cavities, which are hexagonal columnar cavities. When the hydraulic cylinder operates, the movement of components such as the piston generates impact forces and vibrations. When these impact forces and vibrations are transmitted to the intermediate buffer layer 102, the honeycomb-shaped damping cavities undergo elastic deformation, absorbing and dispersing some of the energy, thus providing a buffering and damping effect. The hexagonal columnar cavity structure possesses high strength and stability, enabling it to withstand certain pressures while ensuring a buffering effect, preventing structural damage due to excessive deformation. Since the intermediate buffer layer 102 is located between the outer layer 101 and the inner wear-resistant layer 103, it bears stress from both layers. The honeycomb structure allows stress to be evenly distributed in all directions, reducing local stress concentration and thus lowering the risk of material fatigue damage due to excessive stress, thereby improving the service life of the cylinder assembly. The inner wear-resistant layer 103 directly contacts components such as the piston in the hydraulic cylinder, enduring frequent friction and wear. Its inner wall is provided with multiple annularly distributed axial wear-resistant ridges 3. These ridges increase the contact area distribution between the inner wall and components such as the piston, ensuring a certain lubrication effect while dispersing wear and reducing localized excessive wear. Simultaneously, the inner wear-resistant layer 103 is typically made of high-hardness wear-resistant materials, such as 38CrMoAlA nitrided steel with a surface hardness ≥ HRC55 or a bimetallic composite bushing structure, further improving its wear resistance and effectively protecting the internal structure of the cylinder assembly from wear damage.

[0024] The outer layer 101 is made of 40Cr alloy steel with a tensile strength ≥800MPa. The high tensile strength of the 40Cr alloy steel allows it to withstand the main external impacts and pressures on the hydraulic cylinder, providing fundamental support for the cylinder body and ensuring structural stability. The intermediate buffer layer 102 is made of 6061-T6 aluminum alloy or TC4 titanium alloy with a damping coefficient ≥0.15. The 6061-T6 aluminum alloy or TC4 titanium alloy, with its excellent damping performance, absorbs and disperses energy when the piston moves and impacts, reducing the impact on other layers and protecting the overall structure. The inner wear-resistant layer 103 uses 38CrMoAlA nitrided steel or a bimetallic composite bushing structure with a surface hardness ≥HRC55. The high surface hardness of the 38CrMoAlA nitrided steel or bimetallic composite bushing structure directly resists piston friction and wear, reducing wear and extending the cylinder's service life.

[0025] like Figure 1 As shown, the outer surface of the outer layer 101 is provided with annular reinforcing ribs 4. The reinforcing ribs 4 have a T-shaped cross-section and are integrally cast with the outer layer 101. This design significantly increases the moment of inertia of the outer layer 101. The moment of inertia is an important parameter for measuring an object's resistance to bending and torsion. An increased moment of inertia means that the outer layer 101 has a significantly enhanced ability to resist deformation when subjected to bending and torsional moments, thereby improving the overall mechanical strength of the cylinder assembly and making it less prone to bending or torsional failure under complex working conditions. The integral casting of the reinforcing ribs 4 and the outer layer 101 ensures a tight connection between the reinforcing ribs 4 and the outer layer 101, with no weak points, making the entire structure an organic whole. This integrity allows the outer layer 101 to more evenly transmit and disperse stress when subjected to various external forces, avoiding structural damage caused by local stress concentration, and further improving the structural stability of the cylinder assembly.

[0026] Second embodiment

[0027] like Figure 2 As shown, a wave-shaped transition structure layer 5 is provided between the outer layer 101 and the inner wear-resistant layer 103. The wave-shaped transition structure layer 5 is made of 0Cr18Ni9 stainless steel or 3J1 elastic alloy, both of which have good elasticity and toughness. When the hydraulic cylinder is working, the movement of components such as the piston will generate impact force and vibration. When these forces and vibrations are transmitted to the wave-shaped transition structure layer 5, the wave structure will undergo elastic deformation, absorbing and dispersing some of the energy, playing a buffering role, reducing the direct impact force and vibration on the inner wear-resistant layer 103, and protecting the inner wear-resistant layer 103 from damage.

[0028] like Figure 2As shown, the waveform transition structure layer 5 is made of 0Cr18Ni9 stainless steel or 3J1 elastic alloy. The waveform structure can change the stress transmission path, making the stress more evenly distributed in the transition structure layer. It can disperse concentrated stress over a larger area, avoiding material fatigue and damage caused by excessive local stress, thereby extending the service life of the cylinder block assembly. At the same time, this optimized stress distribution also helps to improve the overall mechanical properties of the cylinder block assembly, making it more stable and reliable when subjected to complex loads.

[0029] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A cylinder body assembly for a wear-resistant hydraulic cylinder, characterized in that: The cylinder includes a coaxially mounted cylindrical body (1), which consists of an outer layer (101), a middle buffer layer (102), and an inner wear-resistant layer (103) from the outside to the inside. The outer layer (101) and the middle buffer layer (102) are connected by an axial protrusion (201) and an axial groove (202). The middle buffer layer (102) has a honeycomb-shaped shock-absorbing cavity with a uniform distribution in an annular shape inside. The shock-absorbing cavity is a hexagonal columnar cavity. The inner wall of the inner wear-resistant layer (103) has a plurality of axial wear-resistant protrusions (3) with a uniform distribution in an annular shape.

2. The cylinder body assembly of a wear-resistant hydraulic cylinder according to claim 1, characterized in that: The outer layer (101) is made of 40Cr alloy steel with a tensile strength ≥800MPa; the middle buffer layer (102) is made of 6061-T6 aluminum alloy or TC4 titanium alloy with a damping coefficient ≥0.15; the inner wear-resistant layer (103) is made of 38CrMoAlA nitrided steel with a surface hardness ≥HRC55 or a bimetallic composite bushing structure.

3. The cylinder body assembly of a wear-resistant hydraulic cylinder according to claim 2, characterized in that: The outer surface of the outer layer (101) is provided with an annular reinforcing rib (4), the cross section of the reinforcing rib (4) is T-shaped, and the reinforcing rib (4) is integrally cast with the outer layer (101).

4. The cylinder body assembly of a wear-resistant hydraulic cylinder according to claim 3, characterized in that: A waveform transition structure layer (5) is provided between the outer layer (101) and the inner wear-resistant layer (103).

5. The cylinder body assembly of a wear-resistant hydraulic cylinder according to claim 4, characterized in that: The waveform transition structure layer (5) is made of 0Cr18Ni9 stainless steel or 3J1 elastic alloy.

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