A hydraulic cylinder with a self-lubricating structure

Abstract

This utility model relates to the field of hydraulic cylinder lubrication technology, specifically disclosing a hydraulic cylinder with a self-lubricating structure. The cylinder includes a hydraulic cylinder body, the outer wall of which is equipped with a self-lubricating mechanism. A lubricant is stored in an oil reservoir. Through the interaction between the spring's rebound force and the annular push plate, pressure is continuously applied to the lubricant in the reservoir, causing it to be continuously and slowly replenished into the annular oil reservoir through multiple inlet pipes. This ensures that the piston rod of the hydraulic cylinder receives fresh lubricant with each extension and retraction, forming a stable oil film throughout the stroke and completely avoiding dry friction. By incorporating an oil storage and automatic replenishment mechanism on the outer wall of the hydraulic cylinder body, continuous and uniform lubrication of the piston rod's surface is achieved throughout its reciprocating motion, effectively reducing wear, extending service life, and achieving maintenance-free or long-term maintenance.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder lubrication technology, and specifically discloses a hydraulic cylinder with a self-lubricating structure. Background Technology

[0002] Hydraulic cylinders use a pressure device to continuously pump hydraulic oil from the tank into the cylinder cavity. They mainly consist of a hydraulic cylinder liner and a hydraulic piston rod. By continuously increasing the hydraulic fluid level, the piston rod is pushed outward. It is a widely used drive device. Due to its powerful drive mechanism, hydraulic cylinders are often used in heavy machinery. However, the operating environment of heavy machinery is often dusty. If the cylinder is not well sealed, impurities can easily enter. These impurities entering between the cylinder liner and the piston rod can cause the piston rod to move poorly. It is necessary to frequently add lubricant between the cylinder liner and the piston rod to reduce friction between the components. However, the gap between the cylinder liner and the piston rod is very small, which makes it difficult to add lubricant.

[0003] Currently, the main lubrication methods are applying grease during assembly or periodically adding it manually via an external grease fitting. These methods have significant drawbacks:

[0004] 1. Relying on manual maintenance requires periodic shutdowns to add grease. Long maintenance intervals result in insufficient lubrication, while short intervals increase maintenance costs and workload.

[0005] 2. Inconsistent and uneven lubrication: The initially applied grease will be gradually scraped off or consumed with the reciprocating motion of the piston rod, failing to form a continuous and stable lubricating oil film on the friction pair surface. This causes dry friction to easily occur between the piston rod and the guide sleeve in the middle of the stroke, accelerating wear. Utility Model Content

[0006] This utility model proposes a hydraulic cylinder with a self-lubricating structure. By setting an oil storage and automatic replenishment mechanism on the outer wall of the hydraulic cylinder, the surface of the piston rod can be continuously and evenly lubricated during the entire reciprocating motion, effectively reducing wear, extending service life, and achieving the effect of maintenance-free or long-term maintenance.

[0007] This utility model is implemented as follows: a hydraulic cylinder with a self-lubricating structure includes a hydraulic cylinder body, and the outer wall of the hydraulic cylinder body is provided with a self-lubricating mechanism.

[0008] The self-lubricating mechanism includes an oil reservoir fixedly connected to the outer wall of the hydraulic cylinder body and having an annular structure. The inner wall of the outer sleeve of the hydraulic cylinder body has an annular oil reservoir groove that matches the piston rod of the hydraulic cylinder body. The upper end face of the oil reservoir is fixedly connected to the hydraulic cylinder body with multiple oil inlet pipes that communicate with the annular oil reservoir groove and are arranged in an array. An annular push plate is provided inside the oil reservoir. The lower end face of the annular push plate has multiple oil injection holes arranged in an array. The lower end face of the annular push plate is fixedly connected with oil injection pipes that communicate with the multiple oil injection holes respectively. The lower ends of the multiple oil injection pipes all extend to the bottom of the oil reservoir and are slidably connected to the oil reservoir.

[0009] As a preferred embodiment of the hydraulic cylinder with a self-lubricating structure of this utility model, the inner and outer walls of the annular push plate are both fixedly connected with piston rings that abut against the inner side wall of the oil reservoir.

[0010] As a preferred embodiment of the hydraulic cylinder with a self-lubricating structure of this utility model, a spring located outside multiple oil injection pipes is fixedly connected between the lower end face of the annular push plate and the lower inner end of the oil reservoir.

[0011] As a preferred embodiment of the hydraulic cylinder with a self-lubricating structure of this utility model, the lower end face of the annular push plate is provided with a plurality of arrayed air passages, and each of the plurality of air passages is equipped with a one-way valve.

[0012] As a preferred embodiment of the hydraulic cylinder with a self-lubricating structure of this utility model, the lower end face of the oil reservoir is provided with a plurality of arrayed air inlets.

[0013] As a preferred embodiment of the hydraulic cylinder with a self-lubricating structure of this utility model, the lower ends of the plurality of oil injection pipes are all threaded with caps, and the outer wall of the caps is provided with anti-slip particles.

[0014] The beneficial effects of this utility model are:

[0015] The oil reservoir stores lubricant. Through the interaction between the spring's rebound force and the annular push plate, pressure is continuously applied to the lubricant in the reservoir. This causes the lubricant to be slowly replenished into the annular oil reservoir through multiple inlet pipes. Consequently, the piston rod of the hydraulic cylinder receives a fresh supply of lubricant with each extension and retraction, forming a stable oil film throughout the stroke and completely preventing dry friction. By incorporating an oil storage and automatic replenishment mechanism on the outer wall of the hydraulic cylinder body, the piston rod's surface is continuously and evenly lubricated throughout its reciprocating motion, effectively reducing wear, extending service life, and achieving maintenance-free or long-term maintenance. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

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

[0019] Figure 3 This utility model Figure 2 Enlarged structural diagram of part a;

[0020] Figure 4 This is a top view cross-sectional structural diagram of the present invention.

[0021] The markings in the diagram are: 1. Hydraulic cylinder body; 2. Oil reservoir; 3. Oil inlet pipe; 4. Annular push plate; 5. Oil injection hole; 6. Oil injection pipe; 7. Piston ring; 8. Spring; 9. Air vent; 10. Check valve; 11. Air inlet; 12. Cap. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0023] Please see Figure 1-4 A hydraulic cylinder with a self-lubricating structure includes a hydraulic cylinder body 1, and the outer wall of the hydraulic cylinder body 1 is provided with a self-lubricating mechanism.

[0024] The self-lubricating mechanism includes an oil reservoir 2 fixedly connected to the outer wall of the hydraulic cylinder body 1 and having an annular structure. The inner wall of the outer sleeve of the hydraulic cylinder body 1 is provided with an annular oil reservoir groove that matches the piston rod of the hydraulic cylinder body 1. The upper end face of the oil reservoir 2 is fixedly connected to the hydraulic cylinder body 1 with multiple oil inlet pipes 3 that communicate with the annular oil reservoir groove and are arranged in an array. An annular push plate 4 is provided inside the oil reservoir 2. Multiple oil injection holes 5 are provided through the lower end face of the annular push plate 4. Oil injection pipes 6 that communicate with the multiple oil injection holes 5 are fixedly connected to the lower end face of the annular push plate 4. The lower ends of the multiple oil injection pipes 6 all extend to the bottom of the oil reservoir 2 and are slidably connected to the oil reservoir 2.

[0025] In this embodiment: During use, first pull down multiple oil injection pipes 6. The multiple oil injection pipes 6 drive the annular push plate 4 to the bottom of the oil reservoir 2. At this time, the spring 8 is in a contracted state. Then, unscrew the multiple caps 12 from the lower ends of the multiple oil injection pipes 6. Then, add lubricant into the oil reservoir 2 through the multiple oil injection pipes 6 and multiple oil injection holes 5. Since the lubricant is viscous, it is difficult for the lubricant to spread in the oil reservoir 2 if it is added through only one oil injection pipe 6. Therefore, adding lubricant into the oil reservoir 2 through multiple oil injection pipes 6 and multiple oil injection holes 5 can fill every corner of the oil reservoir 2 with lubricant and avoid the situation of insufficient lubricant filling. After the filling is completed, put the multiple caps 12 on the multiple oil injection pipes 6. At the lower end, multiple oil injection pipes 6 are then released, causing the spring 8 to rebound. Through the interaction between the rebound force of the spring 8 and the annular push plate 4, pressure is continuously applied to the lubricant in the oil reservoir 2, so that the lubricant in the oil reservoir 2 is continuously and slowly replenished into the annular oil reservoir through multiple oil inlet pipes 3. This ensures that the piston rod of the hydraulic cylinder body 1 receives fresh lubricant each time it extends or retracts, forming a stable oil film throughout the entire stroke, completely avoiding dry friction. Thus, by setting an oil storage and automatic replenishment mechanism on the outer wall of the hydraulic cylinder body 1, the surface of the piston rod can be continuously and evenly lubricated throughout the entire reciprocating motion, effectively reducing wear, extending service life, and achieving maintenance-free or long-cycle maintenance.

[0026] As a technical optimization of this utility model, the inner and outer walls of the annular push plate 4 are both fixedly connected with piston rings 7 that abut against the inner side wall of the oil storage box 2.

[0027] In this embodiment, the inner and outer walls of the annular push plate 4 and the inner wall of the oil reservoir 2 can be sealed by the two piston rings 7.

[0028] As a technical optimization of this utility model, a spring 8 located outside multiple oil injection pipes 6 is fixedly connected between the lower end face of the annular push plate 4 and the lower inner end of the oil storage box 2.

[0029] In this embodiment: the spring 8 can push the annular push plate 4 to move upward in the oil reservoir 2 through the rebound force of the spring 8 and the annular push plate 4, thereby continuously applying pressure to the lubricant in the oil reservoir 2 through the interaction between the rebound force of the spring 8 and the annular push plate 4.

[0030] As a technical optimization of this utility model, the lower end face of the annular push plate 4 is provided with a plurality of arrayed air holes 9, and a one-way valve 10 is installed inside each of the plurality of air holes 9.

[0031] In this embodiment: through multiple air holes 9, air can be allowed to enter the upper part of the oil storage box 2 while the annular push plate 4 is pulled down, preventing negative pressure from being generated in the upper part of the oil storage box 2 and drawing the lubricant in the annular oil storage tank out in the opposite direction. Through the one-way valve 10, air can be allowed to enter the upper part of the oil storage box 2 while preventing the lubricant from flowing down the annular push plate 4 through the air holes 9.

[0032] As a technical optimization of this utility model, the lower end face of the oil storage box 2 is provided with multiple arrayed air inlets 11.

[0033] In this embodiment, multiple air inlets 11 allow air to enter the lower part of the oil reservoir 2, preventing negative pressure from being generated at the lower part of the oil reservoir 2 when the spring 8 pushes the annular pusher 4 upward, thus affecting the upward movement of the annular pusher 4.

[0034] As a technical optimization of this utility model, the lower ends of multiple oil injection pipes 6 are all threaded with caps 12, and the outer wall of the caps 12 is provided with anti-slip particles.

[0035] In this embodiment: the cap 12 can seal the lower end of the oil injection pipe 6, and the anti-slip particles make it easy to twist the cap 12.

[0036] The working principle and usage process of this utility model are as follows: In use, first pull down multiple oil injection pipes 6, which drive the annular push plate 4 to the bottom of the oil storage box 2. Then, unscrew multiple caps 12 from the lower ends of multiple oil injection pipes 6. Then, add lubricant into the oil storage box 2 through multiple oil injection pipes 6 and multiple oil injection holes 5. After adding the lubricant, put multiple caps 12 on the lower ends of multiple oil injection pipes 6, and then loosen multiple oil injection pipes 6 to allow the spring 8 to rebound. Through the interaction between the rebound force of the spring 8 and the annular push plate 4, pressure is continuously applied to the lubricant in the oil storage box 2, so that the lubricant in the oil storage box 2 is continuously and slowly replenished into the annular oil storage groove through multiple oil inlet pipes 3. This ensures that the piston rod of the hydraulic cylinder body 1 receives fresh lubricant every time it extends or retracts, forming a stable oil film throughout the stroke and completely avoiding dry friction.

[0037] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., 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.

[0038] However, the above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A hydraulic cylinder with a self-lubricating structure, comprising a hydraulic cylinder body (1), characterized in that: The outer wall of the hydraulic cylinder body (1) is provided with a self-lubricating mechanism; The self-lubricating mechanism includes an oil storage box (2) fixedly connected to the outer wall of the hydraulic cylinder body (1) and having an annular structure. The inner wall of the outer sleeve of the hydraulic cylinder body (1) is provided with an annular oil storage groove that matches the piston rod of the hydraulic cylinder body (1). The upper end face of the oil storage box (2) is fixedly connected to the hydraulic cylinder body (1) with multiple oil inlet pipes (3) that communicate with the annular oil storage groove and are arranged in an array. An annular push plate (4) is provided inside the oil storage box (2). Multiple oil injection holes (5) are provided through the lower end face of the annular push plate (4). An oil injection pipe (6) is fixedly connected to the lower end face of the annular push plate (4) and communicates with the multiple oil injection holes (5). The lower ends of the multiple oil injection pipes (6) extend to the bottom of the oil storage box (2) and are slidably connected to the oil storage box (2).

2. A hydraulic cylinder with a self-lubricating structure according to claim 1, characterized in that: The inner and outer walls of the annular push plate (4) are both fixedly connected with piston rings (7) that abut against the inner wall of the oil storage box (2).

3. A hydraulic cylinder with a self-lubricating structure according to claim 1, characterized in that: A spring (8) located outside multiple oil injection pipes (6) is fixedly connected between the lower end face of the annular push plate (4) and the lower end of the inner part of the oil storage box (2).

4. A hydraulic cylinder with a self-lubricating structure according to claim 1, characterized in that: The lower end face of the annular push plate (4) is provided with a plurality of arrayed air passages (9), and a one-way valve (10) is installed inside each of the plurality of air passages (9).

5. A hydraulic cylinder with a self-lubricating structure according to claim 1, characterized in that: The lower end face of the oil storage box (2) is provided with multiple arrayed air inlets (11).

6. A hydraulic cylinder with a self-lubricating structure according to claim 1, characterized in that: The lower ends of the multiple oil injection pipes (6) are threaded with caps (12), and the outer wall of the caps (12) is provided with anti-slip particles.

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