Lubrication device for a hydraulic cylinder, and a hydraulic cylinder having the lubrication device

Abstract

The present invention discloses a lubrication device for a hydraulic cylinder, which comprises a cylinder body. A partition ring is arranged in the middle of the cylinder body to divide the cylinder body into an upper oil storage cavity and a lower oil storage cavity. An oil coating part capable of adsorbing lubricating oil is filled in the upper oil storage cavity. The oil coating part is provided with a central hole for the piston rod of the hydraulic cylinder to pass through, and contacts with the outer periphery of the piston rod through the inner wall of the central hole for lubricating the piston rod by coating oil. The lower oil storage cavity is used for temporarily storing lubricating oil to lubricate the piston of the hydraulic cylinder by coating oil. The lubrication device is used in a hydraulic cylinder in a supporting manner. The lubrication device can effectively lubricate the piston and the piston rod of the hydraulic cylinder, solves the lubrication problem existing in the hydraulic cylinder due to tap water medium, can effectively reduce the running resistance of the piston and the piston rod, and reduces the wear of the sealing parts. The present invention also provides a hydraulic cylinder provided with the lubrication device, which can effectively reduce the running resistance of the piston and the piston rod and reduce the wear of the sealing parts.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic transmission devices, and particularly to a lubrication device for a hydraulic cylinder and a hydraulic cylinder having the lubrication device. Background Art

[0002] The hydraulic cylinder uses the pressure of water (mainly tap water) as the power source to drive the piston, and can be applied to fields such as hydraulic assist drive, such as a toilet assistance standing-up seat, which helps the elderly easily complete the squatting and standing-up actions when using the toilet.

[0003] The traditional hydraulic cylinder in a hydraulic system uses hydraulic oil as the working medium, and uses the high-pressure oil output by a hydraulic pump to drive the piston. The hydraulic oil can be used to lubricate the piston. The hydraulic cylinder mainly uses tap water as the working medium. Tap water is easy to obtain, but the lubricating ability of tap water is weak and it has certain impurities. When the hydraulic cylinder operates, it is easy to cause certain running resistance to the piston and the piston rod, increase the friction with the cylinder body, and is easy to cause wear of the sealing parts (such as sealing rings, etc.). Therefore, a lubrication device must be added to the hydraulic cylinder to reduce the running resistance of the piston, the piston rod, etc., and reduce the wear of the sealing parts. Summary of the Invention

[0004] Aiming at the above deficiencies, the present invention provides a lubrication device for a hydraulic cylinder, which can solve the problems of large running resistance of the piston, piston rod, etc. and easy wear of the sealing parts in the existing hydraulic cylinder.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A lubrication device for a hydraulic cylinder includes a cylinder body. A partition ring is provided in the middle of the cylinder body to divide the cylinder body into an upper oil storage cavity and a lower oil storage cavity. The upper oil storage cavity is filled with an oil-applying part capable of adsorbing lubricating oil. The oil-applying part is provided with a central hole for the piston rod of the hydraulic cylinder to pass through, and contacts the outer periphery of the piston rod through the inner wall of the central hole to lubricate the piston rod by applying oil. The lower oil storage cavity is used for temporarily storing lubricating oil to lubricate the piston of the hydraulic cylinder by applying oil.

[0007] Further, an oil through-hole communicating the upper oil storage cavity and the lower oil storage cavity is provided on the partition ring.

[0008] Further, there are multiple oil through-holes, which are distributed circumferentially along the partition ring.

[0009] Further, a communication hole communicating the lower oil storage cavity is provided at the side wall of the upper oil storage cavity.

[0010] Further, the oil-applying part is absorbent cotton or sponge or cotton.

[0011] Further, the aperture of the central through-hole in the middle of the separation ring is smaller than the aperture of the central hole, so that there is a certain gap between the inner circumference of the separation ring and the piston rod.

[0012] Further, a plug is provided on the communication hole for temporarily blocking the communication hole, and an elastic member is provided on the plug so that when the plug is not subjected to external force, the plug can be pushed out downward from the communication hole and the communication hole can communicate with the lower oil storage cavity.

[0013] Further, the elastic member is a compression spring.

[0014] The present invention also provides a hydraulic cylinder, including a cylinder body, a piston and a piston rod, and further including the above lubrication device for the hydraulic cylinder. The cylinder of the lubrication device for the hydraulic cylinder is installed at the top inside the cylinder body, the piston is located below the cylinder, and the piston rod passes through the central holes of the separation ring and the oil application part.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The lubrication device for the hydraulic cylinder provided by the present invention is used in the hydraulic cylinder in a supporting manner. This lubrication device can effectively lubricate the piston and piston rod of the hydraulic cylinder, solve the lubrication problem existing in the hydraulic cylinder due to the tap water medium, effectively reduce the running resistance of the piston and piston rod, and reduce the wear of the sealing member;

[0017] 2. The hydraulic cylinder provided by the present invention is provided with a lubrication device, which can effectively lubricate the piston and piston rod of the hydraulic cylinder, solve the lubrication problem existing in the hydraulic cylinder due to the tap water medium, effectively reduce the running resistance of the piston and piston rod, and reduce the wear of the sealing member. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments.

[0019] Figure 1 It is a schematic structural diagram from a top view angle of Embodiment 1;

[0020] Figure 2 It is a schematic structural diagram from a bottom view angle of Embodiment 1;

[0021] Figure 3 It is an exploded schematic diagram of Embodiment 1;

[0022] Figure 4 It is a schematic structural diagram from a top view angle of Embodiment 1 (the oil application part is not shown);

[0023] Figure 5 It is a schematic structural diagram from a bottom view angle of Embodiment 1 (the oil application part is not shown);

[0024] Figure 6 Schematic top view of Example 1 (the oiling part is not shown);

[0025] Figure 7 is Figure 4 a cross-sectional view of;

[0026] Figure 8 Schematic implementation diagram of Example 1 (partial cross-sectional view);

[0027] Figure 9 Schematic structural diagram of Example 2 (partial cross-sectional view).

[0028] Among them, the marks shown in the figure are: 10 - cylinder body; 11 - upper oil storage chamber; 12 - partition ring; 13 - lower oil storage chamber; 14 - oiling part; 15 - central hole; 16 - oil passage hole; 17 - communication hole; 18 - plug; 181 - slider; 19 - elastic member; 21 - cylinder block; 22 - piston; 23 - piston rod; 24 - temporary chamber; 25 - cylinder head; 26 - ventilation hole; 27 - water inlet. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inner" and the like is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] Example 1

[0033] Please refer to Figures 1 to 8, A preferred embodiment of the present invention provides a lubricating device for a hydraulic cylinder, which is mainly used inside the hydraulic cylinder to reduce the running resistance of the piston and reduce the wear of the sealing member. The lubricating device for the hydraulic cylinder mainly includes a cylinder body 10. The cylinder body 10 is of a cylindrical structure, hollow inside and open at both ends. The cylinder body 10 is made of steel or aluminum alloy material to have a certain strength and maintain the stability of the structure without deformation under pressure. When in use, the cylinder body 10 is installed inside the cylinder body of the hydraulic cylinder, specifically at the top of the cylinder body of the hydraulic cylinder. The outer diameter of the cylinder body 10 is slightly larger than the inner diameter of the cylinder body, so as to fix the cylinder body 10 inside the cylinder body of the hydraulic cylinder by interference fit and keep the cylinder body 10 stationary. A partition ring 12 is fixedly arranged in the middle of the inner wall of the cylinder body 10 to divide the cylinder body 10 into an upper oil storage chamber 11 and a lower oil storage chamber 13. The partition ring 12 is of a ring structure and has a through hole at the center. In this preferred embodiment, the central through hole of the partition ring 12 is coaxially arranged with the partition ring 12. The partition ring 12 is made of steel or aluminum alloy material to have a certain strength and maintain the stability of the structure without deformation under pressure. The partition ring 12 can be integrally formed on the inner wall of the cylinder body 10 or fixed on the cylinder body 10 by welding or other means. The partition ring 12 divides the cylinder body 10 into an upper oil storage chamber 11 and a lower oil storage chamber 13. The upper oil storage chamber 11 is filled with an oil-applying part 14 capable of adsorbing lubricating oil. The oil-applying part 14 can be oil-absorbing cotton, sponge, cotton, etc., which can temporarily absorb the lubricating oil and store it in the oil-applying part 14. The oil-applying part 14 is provided with a central hole 15 for the piston rod of the hydraulic cylinder to pass through, and contacts the outer circumference of the piston rod through the inner wall of the central hole 15 for lubricating the piston rod with oil. That is, when the piston rod passes through the central hole 15 of the oil-applying part 14, the lubricating oil absorbed by the oil-applying part 14 can be smeared on the piston rod through the contact between the oil-applying part 14 and the piston rod. At this time, the lubrication of the piston rod can be realized, so as to reduce the friction between the piston rod and the cylinder head of the cylinder body, thereby reducing the running resistance of the piston rod and reducing the wear of the sealing member. The lower oil storage chamber 13 is used to temporarily store lubricating oil for lubricating the piston of the hydraulic cylinder. In practice, the lower oil storage chamber 13 and the cylinder body and the piston of the hydraulic cylinder form a temporary chamber. By injecting a certain amount of lubricating oil into this chamber, lubrication of the piston can be realized when the piston moves, so as to reduce the friction between the piston and the cylinder body, thereby reducing the running resistance of the piston and reducing the wear of the sealing member.

[0034] In a preferred embodiment, an oil passage hole 16 communicating the upper oil storage cavity 11 and the lower oil storage cavity 13 is provided on the separation ring 12. The oil passage hole 16 is a round hole. The oil passage hole 16 is used to communicate the upper oil storage cavity 11 and the lower oil storage cavity 13. When the piston moves towards the cylinder body 10, when the piston moves to a position in contact with the lower end surface of the cylinder body 10, it can drive the lubricating oil into the lower oil storage cavity 13 and squeeze the lubricating oil to enter the upper oil storage cavity 11 upward through the oil passage hole 16, so as to squeeze the lubricating oil into the oil application part 14, thereby keeping the oil application part 14 adsorbed with sufficient lubricating oil to facilitate oiling and lubricating the piston rod. Of course, the lubricating oil in the upper oil storage cavity 11 can also enter the lower oil storage cavity 13 downward through the oil passage hole 16, that is, the oil passage hole 16 can be used for the circulating flow of the lubricating oil in the upper oil storage cavity 11 and the lower oil storage cavity 13.

[0035] In a preferred embodiment, there are a plurality of oil passage holes 16, which are circumferentially distributed along the separation ring 12. The plurality of oil passage holes 16 are distributed outside the central hole 15 and surround the central hole 15, so as to facilitate uniform oil replenishment for the oil application part 14, thereby facilitating uniform oiling of the piston rod and facilitating keeping the piston rod lubricated.

[0036] In a preferred embodiment, a communication hole 17 communicating with the lower oil storage chamber 13 is provided in the side wall of the upper oil storage chamber 11. A ventilation hole needs to be provided in the chamber formed by the piston and the cylinder block to facilitate the intake and exhaust of air, so as to maintain the pressure balance in the chamber. Generally, this ventilation hole is mainly provided on the cylinder head at the top of the cylinder block. Of course, it can also be provided on the side wall of the cylinder block, depending on the actual use and specific form. In this preferred embodiment, a communication hole 17 is provided in the side wall of the upper oil storage chamber 11. The communication hole 17 is opened downward from the top end of the upper oil storage chamber 11 until it communicates with the lower oil storage chamber 13. During use, the communication hole 17 is aligned and communicated with the ventilation hole of the cylinder head of the hydraulic cylinder, and is used for intake and exhaust when the piston moves, so as to maintain the air pressure balance between the piston and the cylinder block, and ensure the smooth operation of the piston; it is also used for filling lubricating oil. When the lubricating oil is consumed to a certain amount, oil can be injected into the ventilation hole of the hydraulic cylinder, and the lubricating oil can enter the communication hole 17 through the ventilation hole and then enter the lower oil storage chamber 13, so as to realize the filling of lubricating oil. In a preferred embodiment, a plug 18 for temporarily blocking the communication hole 17 is provided on the communication hole 17. The cross-section of the plug 18 is consistent with the cross-section of the communication hole 17, so that when the plug 18 enters the communication hole 17, it can temporarily block the communication hole 17. An elastic member 19 is provided on the plug 18 so that when the plug 18 is not subjected to external force, the plug 18 can be pushed out of the communication hole 17 downward and the communication hole 17 can communicate with the lower oil storage chamber 13. In this preferred embodiment, upward sliders 181 are provided on both sides of the top of the plug 18, and corresponding slide rails are provided in the communication hole 17. The plug 18 is installed in the communication hole 17 through the sliders 181 so that it can slide up and down. When the plug 18 slides downward to the limit position (at this time, the top end of the slider 181 is still located in the slide rail of the communication hole 17), the body of the plug 18 slides out of the communication hole 17. At this time, the bottom of the communication hole 17 is not blocked by the plug 18, so that air can enter and exit, and oil can be injected through the communication hole 17. The elastic member 19 is a compression spring. In this preferred embodiment, there are two elastic members 19, which are respectively installed in the top grooves of the sliders 181 and partially protrude. When the lubricating device is installed in the cylinder block, the top end of the elastic member 19 abuts against the cylinder head of the cylinder block. When the piston moves upward, it can squeeze the plug 18 into the communication hole 17, and the elastic member 19 is compressed. The plug 18 enters the communication hole 17 and temporarily blocks the communication hole 17. At this time, the lubricating oil in the lower oil storage chamber 13 cannot go out through the communication hole 17, so as to ensure that the piston will not squeeze out the lubricating oil when moving upward and ensure that there is enough lubricating oil to be squeezed into the upper oil storage chamber 11 upward to be absorbed by the oil application part 14. When the piston moves downward so that the piston no longer abuts against the plug 18, under the action of the elastic member 19, the elastic member 19 resets and drives the plug 18 downward and away from the communication hole 17. At this time, the communication hole 17 can communicate with the lower oil storage chamber 13 again, and at this time, it does not affect the intake and exhaust of air through the communication hole 17 and the injection of oil through the communication hole 17.

[0037] In a preferred embodiment, the aperture of the central through-hole in the middle of the separating ring 12 is smaller than the aperture of the central hole 15, so that there is a certain gap between the inner circumference of the separating ring 12 and the piston rod. That is to say, when the piston rod passes through the central through-hole of the separating ring 12, the piston rod and the inner circumference of the separating ring 12 are in clearance fit, and there is a certain gap between the two. On the one hand, this gap can prevent the separating ring 12 from contacting the piston rod and affecting the operation of the piston rod. On the other hand, when the piston moves towards the lubricating device and presses the lubricating oil in the oil storage cavity 13, it is convenient for the lubricating oil to enter the upper oil storage cavity 11 from this gap, so as to directly replenish the oil at the inner circumference position of the central hole 15 of the oil application part 14 and keep this part having enough lubricating oil to lubricate the piston rod.

[0038] During implementation, please refer to Figure 8, the lubricating device is installed inside the cylinder block 21 of the hydraulic cylinder. Specifically, the cylinder body 10 is installed at the top of the cylinder block 21 of the hydraulic cylinder by means of interference fit and remains displacement-free from the cylinder block 21 during implementation. At this time, the central through-hole of the separating ring 12 is sleeved around the outer periphery of the piston rod 23 and has a certain gap with the piston rod 23, while the oil application part 14 wraps around the outer periphery of the piston rod 23 through the central hole 15 and is in contact with the piston rod 23. The oil application part 14 adsorbs lubricating oil, and a certain amount of lubricating oil is also stored in the lower oil storage cavity 13 and the temporary chamber 24 formed by the cylinder block 21 of the hydraulic cylinder and the piston 22. The amount of this lubricating oil is mainly such that the volume of the oil is slightly larger than the volume of the lower oil storage cavity 13; the communication hole 17 is aligned and communicated with the vent hole 26 on the cylinder head 25 of the cylinder block 21, and the elastic member 19 abuts against the inner side wall of the cylinder head 25; when water is injected into the cylinder block 21 to make the piston 22 move towards the lubricating device, and when water is pumped out of the cylinder block 21, the piston 22 moves away from the lubricating device. During the movement of the piston 22, the piston rod 23 moves accordingly. During the movement of the piston rod 23, since the oil application part 14 wraps around the outer periphery of the piston rod 23 through the central hole 15 and is in contact with the piston rod 23, the lubricating oil adsorbed on the oil application part 14 can be smeared on the piston rod 23 to achieve oiling and lubrication of the piston rod 23. When the piston rod 23 is smeared with lubricating oil, the running resistance can be greatly reduced, the friction with the cylinder block can be reduced, and the wear of the sealing member can be alleviated; when the piston 22 moves away from the lubricating device, the lubricating oil originally stored temporarily in the lower oil storage cavity 13 is affected by its own gravity and moves together with the piston 22 and accumulates on the top surface of the piston 22. During this process, the inner side wall of the cylinder block 21 will be lubricated, and when the piston 22 moves towards the lubricating device, the inner wall of the cylinder block lubricated by the lubricating oil can reduce the running resistance, that is, the piston 22 is lubricated to reduce the running resistance of the piston 22 and the friction force, thereby alleviating the wear of the sealing member. When the piston 22 runs to contact the bottom end face of the cylinder body 10, it can drive the lubricating oil to move towards the cylinder body 10, drive the lubricating oil into the lower oil storage cavity 13, and squeeze the lubricating oil to enter the upper oil storage cavity 11 upward through the oil passage hole 16 to squeeze the lubricating oil into the oil application part 14, so as to keep the oil application part 14 adsorbing enough lubricating oil for oiling and lubricating the piston rod 23, and the lubricating oil can be squeezed into the upper oil storage cavity 11 through the gap between the inner circumference of the separating ring 12 and the piston rod, so as to directly replenish the lubricating oil at the inner circumference position of the central hole 15 of the oil application part 14 and keep this part having enough lubricating oil to lubricate the piston rod; at the same time, when the piston 22 moves upward to a certain position, it can abut against and squeeze the plug 18 to make the plug 18 move upward to temporarily block the communication hole 17. At this time, the communication hole 17 is blocked, and the lubricating oil can only enter the upper oil storage cavity 11 through the oil passage hole 16 and the gap between the separating ring 12 and the piston rod 23 for replenishing the oil application part 14;When the piston 22 moves downward and no longer abuts against the plug 18, under the action of the elastic member 19, the elastic member 19 resets and drives the plug 18 downward to leave the communication hole 17. At this time, the communication hole 17 can be connected to the lower oil storage chamber 13 again, and at this time, it does not affect the air outlet, air inlet of the communication hole 17 and oil injection through the communication hole 17.

[0039] The lubrication device for a hydraulic cylinder of the present invention is used in a hydraulic cylinder. This lubrication device can effectively lubricate the piston 22 and the piston rod 23 of the hydraulic cylinder, solves the lubrication problem existing in the hydraulic cylinder due to the tap water medium, can effectively reduce the running resistance of the piston 22 and the piston rod 23, and reduces the wear of the sealing member.

[0040] Embodiment 2

[0041] This preferred embodiment provides a hydraulic cylinder. Please refer to Figure 9 , which mainly includes a cylinder block 21, a piston 22 and a piston rod 23. The piston 22 is slidably arranged in the cylinder block 21. One end of the piston rod 23 is fixedly connected to the piston 22, and the other end extends out of the cylinder head 25 at the top of the cylinder block 1. The bottom of the cylinder block 21 is provided with a water inlet 27, the top is provided with a cylinder head 25, the cylinder head 25 is provided with a vent hole 26, and the cylinder block 21 is internally provided with the lubrication device for a hydraulic cylinder of Embodiment 1. The cylinder body 10 of the lubrication device for a hydraulic cylinder is installed at the top inside the cylinder block 21. The piston 22 is located below the cylinder body 10. The piston rod 23 passes through the central holes 15 of the partition ring 12 and the oil application part 14. The communication hole 17 is aligned and communicated with the vent hole 26 on the cylinder head 25 of the cylinder block 21, and the elastic member 19 abuts against the inner side wall of the cylinder head 25. The oil application part 14 adsorbs lubricating oil. The piston rod 23 can be lubricated by the oil application part 14. A certain amount of lubricating oil is injected into the chamber formed by the cylinder block 21 and the piston 22 in the lower oil storage chamber 13. The lubricating oil can lubricate the piston during the piston movement, or can enter the upper oil storage chamber 11 by the extrusion of the piston 22 to facilitate refueling the oil application part 14. The more specific implementation manner and effect of the hydraulic cylinder provided in this embodiment can refer to the implementation manner and effect of Embodiment 1.

[0042] The hydraulic cylinder of this embodiment can effectively lubricate the piston 22 and the piston rod 23 of the hydraulic cylinder by setting the lubrication device, solves the lubrication problem existing in the hydraulic cylinder due to the tap water medium, can effectively reduce the running resistance of the piston 22 and the piston rod 23, and reduces the wear of the sealing member.

[0043] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A lubricating device for a hydraulic cylinder, characterized in that: It includes a cylinder body (10). A partition ring (12) is arranged in the middle of the cylinder body (10) to divide the cylinder body (10) into an upper oil storage cavity (11) and a lower oil storage cavity (13). An oil through hole (16) communicating the upper oil storage cavity (11) and the lower oil storage cavity (13) is arranged on the partition ring (12). A communication hole (17) communicating with the lower oil storage cavity (13) is opened on the side wall of the upper oil storage cavity (11). An oil coating part (14) capable of adsorbing lubricating oil is filled in the upper oil storage cavity (11). The oil coating part (14) is provided with a central hole (15) for the piston rod of the hydraulic cylinder to pass through, and contacts with the outer circumference of the piston rod through the inner wall of the central hole (15) to lubricate the piston rod by coating it with oil. The lower oil storage cavity (13) is used for temporarily storing lubricating oil to lubricate the piston of the hydraulic cylinder by coating it with oil.

2. The lubrication device for a hydraulic cylinder according to claim 1, characterized in that: The oil through holes (16) are multiple and are distributed circumferentially along the partition ring (12).

3. The lubrication device for a hydraulic cylinder according to claim 1, characterized in that: The oil coating part (14) is absorbent cotton or sponge or cotton.

4. The lubrication device for a hydraulic cylinder according to claim 1, characterized in that: The aperture of the central through hole in the middle of the partition ring (12) is smaller than the aperture of the central hole (15) so that there is a gap between the inner circumference of the partition ring (12) and the piston rod.

5. The lubricating device for a hydraulic cylinder according to claim 1, characterized in that: A plug (18) for temporarily blocking the communication hole (17) is arranged on the communication hole (17). An elastic member (19) is arranged on the plug (18) so that when the plug (18) is not subject to external force, the plug (18) can be pushed out of the communication hole (17) downward and the communication hole (17) can communicate with the lower oil storage cavity (13).

6. The lubrication device for a hydraulic cylinder according to claim 5, characterized in that: The elastic member (19) is a compression spring.

7. A hydraulic cylinder, comprising a cylinder block (21), a piston (22) and a piston rod (23), characterized in that, It further includes a lubricating device for a hydraulic cylinder according to any one of claims 1 to 6. The cylinder body (10) of the lubricating device for a hydraulic cylinder is installed at the top inside the cylinder block (21). The piston (22) is located below the cylinder body (10). The piston rod (23) passes through the partition ring (12) and the central hole (15) of the oil coating part (14).

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