Self-lubricating piston assembly of wear-resistant hydraulic oil cylinder

Abstract

The utility model discloses a self-lubricating piston assembly of a wear-resistant hydraulic oil cylinder, which relates to the technical field of hydraulic oil cylinders and is technically characterized by comprising a piston rod, a wear-resistant coating is arranged outside the piston rod, an oil storage cavity is arranged inside the piston rod and used for filling lubricating oil, and an oil outlet is arranged on the outer wall of the piston rod. A mounting cavity is formed between the oil outlet hole and the oil storage cavity, and a slow release assembly is in threaded connection with the interior of the mounting cavity; the self-lubricating wear-resisting bearing has a self-lubricating function, and long-term stability of wear resistance is guaranteed.

Description

Technical Field

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

[0002] In the field of hydraulic cylinder technology, the piston assembly, as one of its core components, directly affects the working efficiency, stability, and service life of the entire hydraulic system. Hydraulic cylinders convert the pressure energy of liquid into mechanical energy through the reciprocating motion of the piston assembly within the cylinder body. During this process, the piston assembly not only must withstand the force of the high-pressure liquid but also maintain efficient and stable operation in a long-term, high-frequency friction environment. Therefore, the wear resistance of the piston assembly has become one of the key indicators for evaluating its quality.

[0003] The piston assembly of traditional hydraulic cylinders, especially the piston rod, is usually made of ordinary steel or alloy materials. Although it meets the basic strength requirements to a certain extent, its wear resistance often falls short when faced with complex and variable working conditions, such as heavy load, high speed, high frequency vibration, and harsh environments (such as high temperature and corrosion).

[0004] To address this technical challenge, existing technologies have attempted to improve the wear resistance of piston rods by modifying material composition, optimizing heat treatment processes, or applying surface coating technologies. For example, Chinese utility model patent CN202022434675.0, entitled "A High Wear-Resistant Piston Rod for Hydraulic Cylinders," proposes an effective solution that significantly improves the wear resistance of piston rods and extends their service life by using specific wear-resistant alloy materials and advanced surface treatment technologies.

[0005] However, with the continuous advancement of industrial technology and the increasing demands on the performance of hydraulic cylinders, exploring and developing more efficient, economical, and environmentally friendly wear-resistant piston assembly technologies remains an important research direction in this field. Against this backdrop, this invention aims to provide an innovative piston assembly design to improve wear resistance. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a self-lubricating piston assembly for a wear-resistant hydraulic cylinder, which improves the wear resistance of the piston rod and extends the overall service life of the equipment.

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

[0008] A self-lubricating piston assembly for a wear-resistant hydraulic cylinder includes a piston rod with a wear-resistant coating on its exterior. An oil reservoir is formed inside the piston rod for filling with lubricating oil. An oil outlet is formed on the outer wall of the piston rod. A mounting cavity is provided between the oil outlet and the oil reservoir. A slow-release component is threadedly connected to the mounting cavity to increase self-lubrication capability and improve wear resistance.

[0009] Preferably, the slow-release component includes a mounting post, the outer wall of which is provided with an external thread adapted to the inner wall of the mounting post, the interior of which is provided with a receiving cavity, the receiving cavity being provided with a flow-slowing element, and both ends of the mounting post having seepage holes communicating with the flow-slowing element, thus having the ability to slow-release lubricating oil.

[0010] Preferably, the flow-retarding element is a permeable cotton strip filled in the receiving cavity, which has the ability to release lubricating oil slowly.

[0011] Preferably, the flow-retarding element is configured as multiple flow-retarding plates staggered within the receiving cavity, which have the ability to release lubricating oil slowly.

[0012] Preferably, the flow-slowing element is a thin tube that is bent and coiled multiple times. The thin tube is placed in the receiving cavity, and its two ends are respectively connected to two seepage holes, which have the ability to release lubricating oil slowly.

[0013] Preferably, the mounting post has a mounting groove facing the oil outlet, and the mounting groove is adapted to be used with a Phillips screwdriver or a hex screwdriver to facilitate the disassembly and assembly of the slow-release component using tools.

[0014] This utility model has the following beneficial effects:

[0015] Self-lubricating function: Oil reservoir and oil outlet design: An oil reservoir inside the piston rod is used to fill with lubricating oil, and an oil outlet on the outer wall of the piston rod ensures a continuous supply of lubricating oil. This design allows the piston assembly to automatically replenish lubricating oil during operation, reducing the need for manual lubrication and improving the operating efficiency and reliability of the equipment. A slow-release component installed in the mounting cavity between the oil outlet and the oil reservoir, through its internal flow-regulating elements (such as permeable cotton strips, flow-regulating plates, or repeatedly bent and coiled thin tubes), controls the outflow rate of the lubricating oil, achieving a slow and uniform release. This design not only ensures continuous lubrication of the piston assembly but also prevents excessive lubricating oil loss, improving lubrication efficiency.

[0016] Ensuring long-term stability of wear resistance: The wear-resistant coating on the piston rod significantly improves the wear resistance of the piston assembly, reduces wear caused by friction, and extends the service life of the piston assembly. Through a self-lubricating mechanism, the piston assembly continuously receives lubrication from lubricating oil during operation, further reducing friction and wear. This mechanism not only improves the wear resistance of the piston assembly but also maintains its long-term operational stability.

[0017] Adjustability of the slow-release assembly: The design of the slow-release assembly allows for adjustments to the type or structure of the flow-damping element (such as a permeable swab, flow-damping plate, or thin tube) to alter the lubricant release rate, thus adapting to different working environments and lubrication requirements. This adjustability enables the piston assembly to better adapt to various complex operating conditions, ensuring the long-term stability of its wear resistance. The mounting slots on the mounting post allow for easy disassembly and replacement of the slow-release assembly using tools such as a screwdriver, facilitating equipment maintenance and upkeep. This further ensures the long-term stable operation of the piston assembly. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a cross-sectional view of the first embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional view of the sustained-release component according to the second embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional view of the sustained-release component according to the second embodiment of the present invention.

[0022] Figure 4 This is a cross-sectional view of the sustained-release component according to the third embodiment of the present invention.

[0023] In the diagram: 1. Piston rod; 101. Oil reservoir; 102. Mounting cavity; 103. Slow-release assembly; 131. Mounting post; 132. External thread; 133. Receiving cavity; 134. Flow retardant; 135. Seepage hole; 136. Mounting groove; 2. Wear-resistant coating. Detailed Implementation

[0024] 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.

[0025] First embodiment

[0026] like Figure 1 As shown, a self-lubricating piston assembly for a wear-resistant hydraulic cylinder includes a piston rod 1, a wear-resistant coating 2 on the outside of the piston rod 1, an oil storage chamber 101 inside the piston rod 1 for filling with lubricating oil, an oil outlet hole on the outer wall of the piston rod 1, and an installation cavity 102 between the oil outlet hole and the oil storage cavity 101. A slow-release component 103 is threadedly connected to the installation cavity 102.

[0027] An appropriate amount of lubricating oil is pre-filled into the oil reservoir 101 inside the piston rod 1. When the piston assembly operates, with the reciprocating motion of the piston rod 1, the lubricating oil in the oil reservoir 101 is gradually released to the outer surface of the piston rod 1 through the oil outlet under pressure or through capillary action. The slow-release component 103 regulates the release rate of the lubricating oil through its internal structure (such as a permeable cotton strip, a flow-damping plate, or a thin tube). These structures slow down the outflow rate of the lubricating oil, allowing it to continuously and evenly cover the outer surface of the piston rod 1, thereby achieving effective lubrication. The wear-resistant coating 2 applied to the outer surface of the piston rod 1 further reduces friction and wear, improving the durability of the piston assembly. The lubricating oil and the wear-resistant coating 2 work together to form a lubricating protective film, effectively reducing frictional loss of the piston assembly during operation. The piston rod 1, the wear-resistant coating 2, the oil reservoir 101, the oil outlet, and the slow-release component 103 together constitute a complete self-lubricating system. This system can continuously provide lubrication during the operation of the piston assembly, reducing friction and wear, and improving the operating efficiency and reliability of the equipment.

[0028] like Figures 1 to 2As shown, the slow-release assembly 103 includes a mounting post 131. The outer wall of the mounting post 131 has an external thread 132 that matches the inner wall of the mounting post 131. The mounting post 131 has a receiving cavity 133 inside, and a flow-slowing element 134 is disposed within the receiving cavity 133. Both ends of the mounting post 131 have seepage holes 135 communicating with the flow-slowing element 134. The receiving cavity 133 is located inside the mounting post 131 and is used to accommodate the flow-slowing element 134. This receiving cavity 133 provides a closed space for the flow-slowing element 134 so that it can operate as designed. The flow-slowing element 134 is a key component for achieving the slow-release effect of lubricating oil. It is located within the receiving cavity 133 and controls the flow rate of the lubricating oil through some means (such as shape, material, or structure). Seepage holes 135 are provided at both ends of the mounting post 131, communicating with the flow-slowing element 134. These seepage holes 135 allow lubricating oil to seep out from the receiving cavity 133 and reach the parts that need lubrication through them.

[0029] like Figures 1 to 2 As shown, in this embodiment, the slow-release component 134 is designed as a permeable cotton strip filled within the receiving cavity 133. The permeable cotton strip is a porous material with good oil absorption and permeability. It can absorb and store lubricating oil while allowing the lubricating oil to seep out at a slower rate. The mounting post 131 has a receiving cavity 133 inside to accommodate the aforementioned permeable cotton strip. The outer wall of the mounting post 131 is provided with external threads 132 that are adapted to the inner wall of the mounting cavity 102, ensuring that the slow-release component 103 can be securely mounted on the piston assembly.

[0030] like Figures 1 to 2 As shown, the mounting post 131 has a mounting groove 136 facing the oil outlet. This mounting groove 136 is designed to be compatible with Phillips screwdrivers or hex screwdrivers, facilitating the removal and replacement of the release assembly 103.

[0031] Second embodiment

[0032] like Figure 3 As shown, the flow-damping element 134 is configured as multiple flow-damping plates staggered within the receiving cavity 133. These flow-damping plates can be flat or other shapes, such as wavy or serrated, to further increase the flow resistance of the lubricating oil. The mounting post 131 has a receiving cavity 133 inside to accommodate the aforementioned flow-damping plates. The flow-damping plates are staggered within the receiving cavity 133, forming a series of narrow channels that limit the flow velocity of the lubricating oil. The staggered arrangement of the flow-damping plates and the design of the narrow channels together achieve a slow-release effect of the lubricating oil. When the piston assembly begins to move, due to the heat and pressure changes generated by friction, the lubricating oil stored in the receiving cavity 133 will seep out at a slower rate through these narrow channels, providing continuous lubrication to the piston assembly.

[0033] Third embodiment

[0034] like Figure 4 As shown, the flow-retarding element 134 is a thin tube with multiple bends and coils, which is disposed within the receiving cavity 133. Both ends of the thin tube are connected to two seepage holes 135. In this embodiment, the flow-retarding element 134 is designed as a thin tube with multiple bends and coils. A series of curved channels are formed inside the thin tube, which are used to limit the flow velocity of the lubricating oil, achieving a slow-release effect. When the piston assembly is stationary, the lubricating oil in the oil storage cavity 101 enters the receiving cavity 133 through some means (such as capillary action, gravity, or pressure difference) and fills the curved channels inside the thin tube. Due to the multiple bends and coils of the thin tube, the flow of lubricating oil within it is subject to significant resistance, thus preventing rapid outflow. The multiple bends and coils of the thin tube achieve a slow-release effect for the lubricating oil. When the piston assembly begins to move, due to the heat and pressure changes generated by friction, the lubricating oil stored in the thin tube slowly seeps out in a controlled manner. The curved channels of the thin tube increase the flow path and resistance of the lubricating oil, thereby slowing down the outflow velocity of the lubricating oil.

[0035] 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 self-lubricating piston assembly for a wear-resistant hydraulic cylinder, comprising a piston rod (1), the piston rod (1) being provided with a wear-resistant coating (2), an oil storage chamber (101) being provided inside the piston rod (1), the oil storage chamber (101) being used to fill lubricating oil, an oil outlet hole being provided on the outer wall of the piston rod (1), an installation cavity (102) being provided between the oil outlet hole and the oil storage chamber (101), and a slow-release component (103) being threadedly connected inside the installation cavity (102).

2. The self-lubricating piston assembly of a wear-resistant hydraulic cylinder according to claim 1, characterized in that: The slow-release component (103) includes a mounting post (131), the outer wall of which is provided with an external thread (132) that is adapted to the inner wall of the mounting post (131), the inside of which is a receiving cavity (133), the receiving cavity (133) is provided with a flow-slowing element (134), and both ends of the mounting post (131) are provided with seepage holes (135) that communicate with the flow-slowing element (134).

3. The self-lubricating piston assembly of a wear-resistant hydraulic cylinder according to claim 2, characterized in that: The slow-flow element (134) is configured as a permeable cotton strip filled in the receiving cavity (133).

4. The self-lubricating piston assembly of a wear-resistant hydraulic cylinder according to claim 2, characterized in that: The flow-retarding element (134) is configured as multiple flow-retarding plates staggered within the receiving cavity (133).

5. The self-lubricating piston assembly of a wear-resistant hydraulic cylinder according to claim 2, characterized in that: The flow-retarding element (134) is a thin tube that is bent and coiled multiple times. The thin tube is placed in the receiving cavity (133), and the two ends of the thin tube are respectively connected to two seepage holes (135).

6. A self-lubricating piston assembly for a wear-resistant hydraulic cylinder according to any one of claims 3 to 5, characterized in that: The mounting post (131) has a mounting groove (136) facing the oil outlet, and the mounting groove (136) is used to be compatible with a Phillips screwdriver or a hexagonal screwdriver.

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