Self-lubricating cylinder

Abstract

This utility model discloses a self-lubricating cylinder, including a cylinder body; a lubrication mechanism installed on the outer wall of the piston rod at the top of the cylinder body for providing lubrication to the piston rod; the lubrication mechanism includes a sleeve, which is detachably installed on the top of the cylinder body end cap, and the top and bottom of the inner ring of the sleeve are provided with mounting grooves, and lubrication rings are installed inside the mounting grooves. Through the setting of the lubrication mechanism, the two sets of graphene material lubrication rings installed on the inner ring of the sleeve, together with the graphene-ceramic composite coating sprayed on the outer wall of the piston rod, utilize the low shear strength characteristics of graphene interlayer to transform traditional metal-metal friction into interlayer sliding friction, thereby reducing the coefficient of friction. At the same time, the lubrication rod assembly continuously adsorbs the lubricating oil in the oil cavity through capillary action and is squeezed and released during the reciprocating motion of the piston rod to form a dynamic lubrication film. This design avoids the dry friction caused by lubricant loss or evaporation in traditional lubrication methods, so that the piston rod is always in a good lubrication state.

Description

Technical Field

[0001] This utility model relates to the field of cylinder technology, specifically to a self-lubricating cylinder. Background Technology

[0002] A cylinder is a cylindrical metal component that guides a piston in a linear reciprocating motion within the cylinder. In an engine cylinder, air expands, converting thermal energy into mechanical energy; in a compressor cylinder, gas is compressed by the piston, increasing its pressure. During operation, cylinders typically have inlet and outlet ports at both ends of the cylinder body, allowing gas to enter and apply pressure to the piston against its inner wall, thus enabling the piston to move the piston rod.

[0003] In existing technologies, piston rods are typically sealed using guide sleeves and internal sealing rings. However, with prolonged use, lubricant can easily evaporate, leak, or become contaminated. Insufficient lubrication between the sealing ring and the piston rod can lead to wear and affect cylinder performance. Therefore, we need to propose a self-lubricating cylinder. Utility Model Content

[0004] The purpose of this invention is to provide a self-lubricating cylinder that, through the setting of a lubrication mechanism, avoids dry friction caused by lubricant loss or evaporation in traditional lubrication methods, and keeps the piston rod in a good lubrication state to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A self-lubricating cylinder includes a cylinder body;

[0007] The lubrication mechanism is installed on the outer wall of the piston rod at the top of the cylinder body to provide lubrication to the piston rod;

[0008] The lubrication mechanism includes a sleeve, which is detachably installed on the top of the cylinder body end cover. The top and bottom of the inner ring of the sleeve are provided with mounting grooves, and a lubrication ring is installed inside the mounting groove. The inner wall of the lubrication ring is slidably connected to the outer wall of the cylinder body piston rod. An oil cavity is provided inside the sleeve, and a lubrication rod assembly extending to the inner ring of the sleeve is installed in the oil cavity to assist in lubricating the piston rod of the cylinder body in conjunction with the two sets of lubrication rings.

[0009] Preferably, the lubrication rod assembly includes a connecting ring plate, an inner ring plate is fixedly connected to the outer wall of the connecting ring plate, an outer ring plate is fixedly connected to the inner wall of the inner ring plate, the outer ring plate is located in the inner ring of the sleeve, and the inner wall of the outer ring plate is slidably connected to the outer wall of the piston rod of the cylinder body, the inner ring plate is located inside the oil chamber, and the inner side wall of the inner ring plate is in contact with the inner wall of the oil chamber.

[0010] Preferably, the connecting ring, inner ring, and outer ring are all made of porous ceramic material, and the oil cavity is filled with lubricating oil.

[0011] Preferably, an oil overflow groove communicating with the oil cavity is provided at the center of the inner wall of the sleeve, and the connecting ring is located inside the oil overflow groove. The outer diameter of the connecting ring is larger than the inner diameter of the oil overflow groove, which is used to seal the oil overflow groove and control the amount of lubricating oil overflow.

[0012] Preferably, an oil injection hole communicating with the oil cavity is provided on one side of the sleeve, and a sealing plug is installed in the internal thread of the oil injection hole.

[0013] Preferably, the outer wall of the sleeve is provided with four sets of fixing components in a ring array. Each fixing component includes an assembly block, which is fixedly installed on the bottom outer wall of the sleeve. A fixing bolt is installed at the bottom of one end of the assembly block, and the bottom of the fixing bolt passes through the assembly block and is threaded to the top of the cylinder body end cover.

[0014] Preferably, the lubrication ring is a graphene lubrication ring, and the outer wall of the piston rod of the cylinder body is coated with a graphene-ceramic composite coating.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention utilizes a lubrication mechanism. Two sets of graphene lubrication rings installed on the inner ring of the sleeve, combined with a graphene-ceramic composite coating sprayed on the outer wall of the piston rod, transform traditional metal-metal friction into interlayer sliding friction by taking advantage of the low interlayer shear strength of graphene. This reduces the coefficient of friction. Simultaneously, the lubrication rod assembly continuously adsorbs lubricating oil in the oil chamber through capillary action and releases it under pressure during the reciprocating motion of the piston rod, forming a dynamic lubricating film. This design avoids the dry friction caused by lubricant loss or evaporation in traditional lubrication methods, ensuring that the piston rod is always in a well-lubricated state. Attached Figure Description

[0017] Figure 1 This is a side view of the three-dimensional structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the sleeve and lubrication ring of this utility model;

[0019] Figure 3 This is a cross-sectional structural schematic diagram of the lubrication mechanism of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the lubrication rod assembly of this utility model.

[0021] In the diagram: 1. Cylinder body; 2. Lubrication mechanism; 21. Sleeve; 22. Mounting groove; 23. Lubrication ring; 24. Oil chamber; 25. Oil overflow groove; 26. Lubrication rod assembly; 261. Connecting ring plate; 262. Inner ring plate; 263. Outer ring plate; 27. Oil injection hole; 28. Sealing plug; 29. ​​Fixing assembly; 291. Assembly block; 292. Fixing bolt. Detailed Implementation

[0022] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution:

[0024] A self-lubricating cylinder includes a cylinder body 1;

[0025] Lubrication mechanism 2 is installed on the outer wall of the piston rod at the top of the cylinder body 1 and is used to provide lubrication to the piston rod;

[0026] In an optional embodiment: the lubrication mechanism 2 includes a sleeve 21, which is detachably installed on the top of the end cap of the cylinder body 1. The top and bottom of the inner ring of the sleeve 21 are provided with mounting grooves 22, and a lubrication ring 23 is installed inside the mounting groove 22. The inner wall of the lubrication ring 23 is slidably connected to the outer wall of the piston rod of the cylinder body 1. An oil cavity 24 is provided inside the sleeve 21. A lubrication rod assembly 26 extending to the inner ring of the sleeve 21 is installed in the oil cavity 24 to assist in lubricating the piston rod of the cylinder body 1 in conjunction with the two sets of lubrication rings 23.

[0027] It should be noted that the detachable sleeve 21 design greatly facilitates later maintenance. When the lubricating ring 23 wears or the oil chamber 24 needs cleaning, it is not necessary to remove the entire cylinder end cover. Only the sleeve 21 needs to be removed for operation, which greatly shortens the maintenance time. The two sets of lubricating rings 23 at the top and bottom form a "pincer" lubrication pattern. When the piston rod extends and retracts, it will first pass through the bottom lubricating ring for initial lubrication, and then be further lubricated by the top lubricating ring. The double protection reduces the possibility of dry friction. The cooperation between the oil chamber 24 and the lubrication rod assembly 26 realizes the combination of "active oil supply + passive lubrication", which solves the problem that the traditional single lubricating ring is prone to failure due to the depletion of lubricating oil and extends the lubrication cycle.

[0028] In an optional embodiment: the lubrication rod assembly 26 includes a connecting ring 261, an inner ring 262 is fixedly connected to the outer wall of the connecting ring 261, an outer ring 263 is fixedly connected to the inner wall, the outer ring 263 is located in the inner ring of the sleeve 21, and the inner wall of the outer ring 263 is slidably connected to the outer wall of the piston rod of the cylinder body 1, the inner ring 262 is located inside the oil chamber 24, and the inner sidewall of the inner ring 262 is in contact with the inner wall of the oil chamber 24.

[0029] It should be noted that the connecting ring 261, inner ring 262, and outer ring 263 form a linkage structure. The inner ring 262 fits against the inner wall of the oil cavity 24 to fully contact the lubricating oil. The oil is conducted to the outer ring 263 through the connecting ring 261, and the outer ring 263 directly contacts the piston rod to achieve lubrication. This "oil conduction-contact lubrication" path is short and efficient, avoiding the loss of lubricating oil during the transmission process. At the same time, the design of the outer ring 263 slidingly connecting with the piston rod and the inner ring 262 fitting against the inner wall of the oil cavity 24 ensures the stability of the lubrication rod assembly 26 when it moves with the piston rod. The lubrication effect will not be affected by vibration or displacement, thus improving the operational reliability of the mechanism.

[0030] In an optional embodiment: the connecting ring 261, the inner ring 262 and the outer ring 263 are all made of porous ceramic material, and the oil cavity 24 is filled with lubricating oil.

[0031] It should be noted that porous ceramic materials have abundant microporous structures, and their "sponge-like" adsorption properties can firmly lock in the lubricating oil in the oil chamber 24, achieving slow release of the lubricating oil. This avoids the problem of rapid oil loss caused by insufficient sealing in traditional metal components. At the same time, ceramic materials have high hardness and strong wear resistance, and are not easily worn when in long-term contact with the piston rod. This solves the problem of metal components being easily worn by the piston rod and generating debris that contaminates the oil chamber. In addition, ceramic materials have good chemical stability and will not react with the lubricating oil, ensuring the performance stability of the lubricating oil and extending the oil replacement cycle.

[0032] In an optional embodiment: an oil overflow groove 25 communicating with the oil cavity 24 is provided in the center of the inner wall of the sleeve 21, and a connecting ring 261 is located inside the oil overflow groove 25. The outer diameter of the connecting ring 261 is larger than the inner diameter of the oil overflow groove 25, which is used to seal the oil overflow groove 25 and control the amount of lubricating oil overflow.

[0033] It should be noted that the oil overflow groove 25 is the key channel for oil supply from the oil chamber 24 to the lubrication rod assembly 26. The design of the connecting ring 261 having an outer diameter larger than the inner diameter of the oil overflow groove 25 forms a "flexible seal + quantitative overflow" mechanism. When the oil pressure inside the oil chamber 24 is low, the connecting ring 261 fits tightly against the edge of the oil overflow groove 25, reducing oil leakage. When the piston rod movement causes the lubrication rod assembly 26 to vibrate or the oil chamber is filled with a large amount of oil, the connecting ring 261 will deform slightly due to pressure, allowing a small amount of lubricating oil to enter the ring micropores through the gap and then be conducted to the outer ring 263. This design precisely controls the amount of lubricating oil overflow, ensuring the amount of oil required for lubrication while avoiding oil waste and environmental pollution caused by excessive overflow.

[0034] In an optional embodiment: an oil injection hole 27 communicating with the oil cavity 24 is provided on one side of the sleeve 21, and a sealing plug 28 is installed in the internal thread of the oil injection hole 27.

[0035] It should be noted that the oil filling hole 27 allows for lubricant replenishment without disassembling the sleeve 21; it can be completed directly using an oil filling tool, simplifying the operation process. This is especially suitable for rapid oil replenishment without shutting down the equipment. The threaded sealing plug 28 provides a strong seal, effectively preventing lubricant leakage from the oil chamber 24 due to cylinder vibration or temperature changes. It also prevents external dust and moisture from entering the oil chamber 24 through the oil filling hole 27 and contaminating the lubricant, ensuring the cleanliness of the oil and reducing lubrication failure caused by impurities.

[0036] In an optional embodiment: four sets of fixing components 29 are installed in a ring array on the outer wall of the sleeve 21. The fixing components 29 include assembly blocks 291, which are fixedly installed on the bottom outer wall of the sleeve 21. A fixing bolt 292 is installed at the bottom of one end of the assembly block 291. The bottom of the fixing bolt 292 passes through the assembly block 291 and is threaded to the top of the end cover of the cylinder body 1.

[0037] It should be noted that the four sets of ring-shaped fixed components 29 can evenly distribute the pressure of the sleeve 21 to four points on the end cap of the cylinder body 1, avoiding the uneven force and tilting of the sleeve 21 caused by single-point fixing, ensuring the coaxiality of the inner ring of the sleeve 21 and the piston rod, reducing local wear caused by eccentricity. The threaded connection of the fixing bolt 292 is easy to disassemble and has high connection strength, which can withstand the vibration and impact force when the cylinder is working. It solves the problem of easy loosening of traditional snap-fit ​​fixing and improves the installation stability of the lubrication mechanism.

[0038] In an optional embodiment: the lubrication ring 23 is configured as a graphene lubrication ring, and the outer wall of the piston rod of the cylinder body 1 is coated with a graphene-ceramic composite coating.

[0039] It should be noted that the graphene lubricating ring utilizes the layered structure and low coefficient of friction of graphene to form a lubricating film on the piston rod surface, significantly reducing the coefficient of friction. At the same time, graphene's good thermal conductivity can quickly dissipate the heat generated by friction, preventing localized high temperatures from damaging the components. The graphene-ceramic composite coating on the piston rod surface combines the lubricity of graphene with the wear resistance of ceramics, enhancing the hardness of the piston rod surface (hardness can reach HRC60 or higher) and further reducing the frictional resistance with the lubricating ring 23. The two work together to form a "double lubrication layer," significantly improving the cylinder's wear resistance and extending the service life of the piston rod and lubrication mechanism 2.

[0040] Working principle: When the cylinder body 1 is in use, lubricating oil is injected into the oil chamber 24 of the sleeve 21 through the oil injection hole 27. The lubricating oil is absorbed and stored by the porous ceramic lubrication rod assembly 26 (connecting ring 261, inner ring 262, outer ring 263).

[0041] When the piston rod of the cylinder body 1 moves in extension and retraction, it causes the outer ring plate 263 to slide against the outer wall of the piston rod. Since the inner ring plate 262 is in contact with the inner wall of the oil chamber 24, the lubricating oil continuously penetrates to the outer ring plate 263 through the capillary action of the porous ceramic, and then is evenly coated on the surface of the piston rod by the outer ring plate 263.

[0042] During the reciprocating motion of the piston rod, the graphene lubricating ring 23 provides secondary lubrication to its surface, ensuring full-stroke coverage. The graphene-ceramic composite coating on the piston rod surface and the graphene lubricating ring 23 form a low-friction pair, further reducing the coefficient of friction and improving wear resistance.

[0043] The design of the removable sleeve 21 and threaded sealing plug 28 allows for lubrication replenishment and replacement of the lubrication ring 23 without disassembling the cylinder, thus shortening maintenance time.

[0044] Lubricating oil in oil chamber 24 → inner ring plate 262 → connecting ring plate 261 → outer ring plate 263 → piston rod.

[0045] 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. A self-lubricating cylinder, characterized in that, Includes the cylinder body (1); The lubrication mechanism (2) is installed on the outer wall of the piston rod at the top of the cylinder body (1) to provide lubrication to the piston rod; The lubrication mechanism (2) includes a sleeve (21), which is detachably installed on the top of the end cap of the cylinder body (1). The top and bottom of the inner ring of the sleeve (21) are provided with mounting grooves (22), and a lubrication ring (23) is installed inside the mounting groove (22). The inner wall of the lubrication ring (23) is slidably connected to the outer wall of the piston rod of the cylinder body (1). An oil cavity (24) is provided inside the sleeve (21), and a lubrication rod assembly (26) extending to the inner ring of the sleeve (21) is installed in the oil cavity (24) to assist in lubricating the piston rod of the cylinder body (1) with the two sets of lubrication rings (23).

2. A self-lubricating cylinder according to claim 1, characterized in that: The lubrication rod assembly (26) includes a connecting ring (261), an inner ring (262) is fixedly connected to the outer wall of the connecting ring (261), and an outer ring (263) is fixedly connected to the inner wall. The outer ring (263) is located in the inner ring of the sleeve (21), and the inner wall of the outer ring (263) is slidably connected to the outer wall of the piston rod of the cylinder body (1). The inner ring (262) is located inside the oil chamber (24), and the inner side wall of the inner ring (262) is in contact with the inner wall of the oil chamber (24).

3. A self-lubricating cylinder according to claim 2, characterized in that: The connecting ring (261), inner ring (262) and outer ring (263) are all made of porous ceramic material, and the oil cavity (24) is filled with lubricating oil.

4. A self-lubricating cylinder according to claim 3, characterized in that: An oil overflow groove (25) communicating with the oil cavity (24) is provided in the center of the inner wall of the sleeve (21). The connecting ring (261) is located inside the oil overflow groove (25). The outer diameter of the connecting ring (261) is larger than the inner diameter of the oil overflow groove (25), which is used to seal the oil overflow groove (25) and control the amount of lubricating oil overflow.

5. A self-lubricating cylinder according to claim 2, characterized in that: The sleeve (21) has an oil injection hole (27) on one side that connects to the oil cavity (24), and a sealing plug (28) is installed inside the oil injection hole (27).

6. A self-lubricating cylinder according to claim 1, characterized in that: The outer wall of the sleeve (21) is equipped with four sets of fixing components (29) in a ring array. The fixing components (29) include an assembly block (291). The assembly block (291) is fixedly installed on the bottom outer wall of the sleeve (21), and a fixing bolt (292) is installed at the bottom of one end of the assembly block (291). The bottom of the fixing bolt (292) passes through the assembly block (291) and is threaded to the top of the end cover of the cylinder body (1).

7. A self-lubricating cylinder according to claim 2, characterized in that: The lubrication ring (23) is a graphene lubrication ring, and the outer wall of the piston rod of the cylinder body (1) is coated with a graphene-ceramic composite coating.

Images