Self-lubricating air cylinder

Abstract

The utility model provides a self-lubricating air cylinder, and belongs to the technical field of air cylinders. The self-lubricating air cylinder comprises a cylinder body, a rear end cover, a front end cover, a piston rod, a piston body, an oil storage ring groove, an oil injection hole, an oil injection base, an oil cup and an oil seal. The oil injection hole is formed in the outer wall of the cylinder body, the oil storage ring groove is formed in the outer wall of the piston body, and the oil injection hole is opposite to the oil storage ring groove, so that lubricating oil can enter the oil storage ring groove through the oil injection hole, and the oil storage ring groove can store the lubricating oil. Lubricating oil is injected into the oil storage annular groove, the oil seals are arranged on the two sides of the oil storage annular groove in a sleeving mode, so that the lubricating oil is sealed in the oil storage annular groove, compared with the mode that the inner wall of a cylinder body is coated with the lubricating oil, waste of the lubricating oil can be avoided, meanwhile, the contact part of the piston body and the cylinder body can be precisely lubricated through the lubricating oil, and the service life of the piston body is prolonged. Therefore, the lubricating effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylinders, and in particular relates to a self-lubricating cylinder. Background Art

[0002] In related technologies, cylinders are widely used in various fields. When the cylinder is working, the piston reciprocates in the cylinder body without stopping. In order to prevent the wear of the piston and the cylinder body, lubricating oil is usually applied to the inner wall of the cylinder body to achieve lubrication of the piston and the cylinder body.

[0003] With the above structure, since the lubricating oil is coated on the inner wall of the cylinder, the contact portion between the piston and the cylinder cannot be accurately lubricated, resulting in a waste of lubricating oil and reducing the lubrication effect. Utility Model Content

[0004] In order to solve the problem in the above-mentioned prior art that the contact part between the piston and the cylinder body cannot be accurately lubricated, resulting in waste of lubricating oil and reduced lubrication effect, the utility model provides a self-lubricating cylinder, which injects lubricating oil into the oil ring groove and sets oil seals on both sides of the oil ring groove to achieve the purpose of sealing the lubricating oil in the oil ring groove. Compared with coating the lubricating oil on the inner wall of the cylinder body, it can avoid the waste of lubricating oil and at the same time achieve the purpose of accurately lubricating the contact part between the piston body and the cylinder body with lubricating oil, thereby improving the lubrication effect. Its specific technical solution is as follows:

[0005] A self-lubricating cylinder, comprising: a cylinder body, a rear end cover, a front end cover, a piston rod, a piston body, an oil storage ring groove, an oil filling hole, an oil filling seat, an oil cup and an oil seal; the cylinder body is a hollow cavity with openings at both ends; an air inlet hole is provided in the rear end cover, at least part of the rear end cover is embedded in the opening at one end of the cylinder body; at least part of the front end cover is embedded in the opening at the other end of the cylinder body; the piston rod passes through the front end cover, one end of the piston rod is located in the cylinder body, and the other end of the piston rod is located outside the cylinder body; the piston body is located in the cylinder body , and the piston body is connected to one end of the piston rod; the oil ring groove is provided on the outer wall of the piston body; the oil filling hole is provided on the outer wall of the cylinder body, and the oil filling hole is opposite to the oil ring groove; a mounting hole is provided in the oil filling seat, the oil filling seat is sleeved on the outer side of the cylinder body, and the oil filling seat is located on the outer side of the oil filling hole; the oil cup is installed in the mounting hole, and the oil cup is opposite to the oil filling hole; the oil seal is an elastomer, two oil seals are sleeved on the outer side of the piston body, the two oil seals are located on both sides of the oil ring groove, and the two oil seals are in contact with the inner wall of the cylinder body.

[0006] In addition, the self-lubricating cylinder in the above technical solution provided by the present invention may also have the following additional technical features:

[0007] In the above technical solution, the self-lubricating cylinder also includes: a first ventilation groove, a silencer seat and a muffler; the first ventilation groove is arranged in the front end cover, the first ventilation groove is located in the cylinder body, and the first ventilation groove is opposite to the piston body; a second ventilation groove is arranged in the silencer seat, the silencer seat is installed on the outside of the front end cover, and the second ventilation groove is connected to the first ventilation groove; the muffler is a hollow cavity with an opening at one end, the muffler is installed on the silencer seat, and the opening of the muffler is connected to the second ventilation groove.

[0008] In the above technical solution, the self-lubricating cylinder also includes: a receiving groove, a first external thread and a mounting nut; the receiving groove is arranged on the side of the piston body close to the rear end cover, and the receiving groove is arranged around the outside of the piston rod; the first external thread is arranged on the outside of one end of the piston rod close to the rear end cover; a first internal thread is arranged in the mounting nut, the mounting nut is mounted on the outside of one end of the piston rod close to the rear end cover, the mounting nut is located in the receiving groove, and the mounting nut is in contact with the piston body; wherein, the first external thread is adapted to the first internal thread.

[0009] In the above technical solution, the self-lubricating cylinder also includes: a second internal thread and an air intake pipe; the second internal thread is arranged in the air intake hole; the air intake pipe is a hollow cavity with openings at both ends, and a second external thread is arranged on the outer walls of both ends of the air intake pipe, and one end of the air intake pipe is embedded in the air intake hole; wherein, the second internal thread is adapted to the second external thread.

[0010] In the above technical solution, the self-lubricating cylinder also includes: a first sealing ring; the first sealing ring is an elastomer, two first sealing rings are sleeved on the outside of the cylinder body, the two first sealing rings are embedded in the oil filling seat, and the two first sealing rings are located on both sides of the oil filling hole.

[0011] In the above technical solution, the self-lubricating cylinder also includes: a second sealing ring and a third sealing ring; the second sealing ring is an elastomer, the second sealing ring is sleeved on the outer side of the rear end cover, and the second sealing ring is in contact with the inner wall of the cylinder body; the third sealing ring is an elastomer, the third sealing ring is sleeved on the outer side of the front end cover, and the third sealing ring is in contact with the inner wall of the cylinder body.

[0012] In the above technical solution, the self-lubricating cylinder also includes: a third external thread, a connecting seat and a connecting groove; the third external thread is arranged on the outside of the end of the piston rod located on the outside of the cylinder body; a connecting hole is provided in one end of the connecting seat, a third internal thread is provided in the connecting hole, and the end of the piston rod located on the outside of the cylinder body is embedded in the connecting hole; the connecting groove is provided in the end of the connecting seat away from the connecting hole; wherein the third external thread is adapted to the third internal thread.

[0013] Compared with the prior art, the self-lubricating cylinder of the present invention has the following beneficial effects:

[0014] 1. By positioning an oil filling hole on the outer wall of the cylinder body and an oil storage ring groove on the outer wall of the piston body, with the oil filling hole and the oil storage ring groove facing each other, lubricating oil can enter the oil storage ring groove through the oil filling hole, thereby enabling the oil storage groove to store the lubricating oil. By injecting lubricating oil into the oil storage ring groove and fitting oil seals on both sides of the oil storage ring groove to seal the lubricating oil within the oil storage ring groove, this can avoid lubricating oil waste compared to applying lubricating oil to the inner wall of the cylinder body. It can also ensure that the lubricating oil precisely lubricates the contact area between the piston body and the cylinder body, thereby improving lubrication efficiency.

[0015] 2. By installing the silencer seat on the outside of the front cover and making the second ventilation groove in the silencer seat opposite to the first ventilation groove, the front cover supports the silencer seat, so that the air flowing into the first ventilation groove can flow into the second ventilation groove; by installing the muffler on the silencer seat and making the opening of the muffler communicate with the second ventilation groove, the air flowing into the second ventilation groove can flow into the muffler, thereby reducing the exhaust noise of the muffler and improving the user experience.

[0016] 3. By arranging the receiving groove on the side of the piston body close to the rear end cover, and making the receiving groove around the outside of the piston rod, the end of the piston rod can be hidden in the piston body, thereby avoiding interference between the piston rod and the rear end cover, thereby improving quality; by locating the mounting nut in the receiving groove, the mounting nut can be hidden in the receiving groove, thereby avoiding interference between the mounting nut and the rear end cover, thereby improving quality.

[0017] 4. By setting a second internal thread in the air inlet hole and embedding one end of the air inlet pipe into the air inlet hole, the air inlet pipe and the rear end cover are threadedly connected, thereby connecting the air inlet pipe and the rear end cover together, reducing the difficulty of connecting the air source and the rear end cover, thereby improving the user experience.

[0018] 5. By sleeved two first sealing rings on the outside of the cylinder body, the two first sealing rings are embedded in the oil filling seat, and the two first sealing rings are located on both sides of the oil filling hole, so that the two first sealing rings can seal both sides of the oil filling hole, thereby preventing lubricating oil from flowing out from both sides of the oil filling hole, thereby improving the sealing performance.

[0019] 6. By putting the second sealing ring on the outer side of the rear end cover and fitting the second sealing ring to the inner wall of the cylinder body, the second sealing ring can seal the gap between the rear end cover and the cylinder body, thereby improving the sealing performance; by putting the third sealing ring on the outer side of the front end cover and fitting the third sealing ring to the inner wall of the cylinder body, the third sealing ring can seal the gap between the front end cover and the cylinder body, thereby further improving the sealing performance.

[0020] 7. By setting the connecting groove in the end of the connecting base away from the connecting hole, the connecting base can be connected to other components through the connecting groove, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional view of a self-lubricating cylinder of the present utility model;

[0022] Figure 2 for Figure 1 A local enlarged view of point A;

[0023] Figure 3 for Figure 1 A partial enlarged view of point B;

[0024] Figure 4 for Figure 1 Cross-sectional view at CC;

[0025] Figure 5 for Figure 4 A partial enlarged view of point D;

[0026] Figure 6 for Figure 4 A local enlarged view of point E;

[0027] in, Figures 1 to 6 The corresponding relationship between the reference numerals and component names is as follows:

[0028] 10 cylinder body, 11 rear end cover, 12 air inlet hole, 13 front end cover, 14 piston rod, 15 piston body, 16 oil ring groove, 17 oil filling hole, 18 oil filling seat, 19 mounting hole, 20 oil cup, 21 oil seal, 22 first ventilation groove, 23 muffler seat, 24 muffler, 25 receiving groove, 26 mounting nut, 27 intake pipe, 28 first sealing ring, 29 second sealing ring, 30 third sealing ring, 31 connecting seat, 32 connecting groove, 33 second ventilation groove. DETAILED DESCRIPTION

[0029] The following is a combination of specific implementation cases and attached Figures 1 to 6 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0030] A self-lubricating cylinder, such as Figures 1 to 3As shown, the self-lubricating cylinder includes: a cylinder body 10, a rear end cover 11, a front end cover 13, a piston rod 14, a piston body 15, an oil storage ring groove 16, an oil filling hole 17, an oil filling seat 18, an oil cup 20 and an oil seal 21; the cylinder body 10 is a hollow cavity with openings at both ends; an air inlet hole 12 is provided in the rear end cover 11, at least part of the rear end cover 11 is embedded in the opening at one end of the cylinder body 10; at least part of the front end cover 13 is embedded in the opening at the other end of the cylinder body 10; the piston rod 14 passes through the front end cover 13, one end of the piston rod 14 is located in the cylinder body 10, and the other end of the piston rod 14 is located outside the cylinder body 10; the piston body 15 is located in the cylinder body 10, and the piston The plug body 15 is connected to one end of the piston rod 14; the oil ring groove 16 is provided on the outer wall of the piston body 15; the oil filling hole 17 is provided on the outer wall of the cylinder body 10, and the oil filling hole 17 is opposite to the oil ring groove 16; a mounting hole 19 is provided in the oil filling seat 18, the oil filling seat 18 is mounted on the outside of the cylinder body 10, and the oil filling seat 18 is located on the outside of the oil filling hole 17; the oil cup 20 is installed in the mounting hole 19, and the oil cup 20 is opposite to the oil filling hole 17; the oil seal 21 is an elastomer, and the two oil seals 21 are mounted on the outside of the piston body 15, the two oil seals 21 are located on both sides of the oil ring groove 16, and the two oil seals 21 are in contact with the inner wall of the cylinder body 10.

[0031] By embedding at least a portion of the rear end cover 11 into the opening at one end of the cylinder body 10, and embedding at least a portion of the front end cover 13 into the opening at the other end of the cylinder body 10, the front end cover 13 and the rear end cover 11 can seal both ends of the cylinder body 10. By setting the air inlet hole 12 in the rear end cover 11, air can enter the cylinder body 10 through the air inlet hole 12. By passing the piston rod 14 through the front end cover 13, one end of the piston rod 14 is located inside the cylinder body 10, and the other end of the piston rod 14 is located outside the cylinder body 10, so that the piston rod 14 can move inside the front end cover 13. By connecting the piston body 15 to one end of the piston rod 14 and positioning the piston body 15 inside the cylinder body 10, the piston body 15 and the piston rod 14 can move synchronously, thereby enabling the piston body 15 to move inside the cylinder body 10. By arranging the oil storage ring groove 16 on the outer wall of the piston body 15, the lubricating oil can be stored in the oil storage ring groove 16, so that when the piston body 15 moves in the cylinder body 10, the lubricating oil in the oil storage ring groove 16 can lubricate the inner wall of the cylinder body 10; by arranging the oil filling hole 17 on the outer wall of the cylinder body 10, and the oil filling hole 17 is opposite to the oil storage ring groove 16, the lubricating oil can be injected into the oil storage ring groove 16 through the oil filling hole 17; by welding the oil filling seat 18 to the outside of the cylinder body 10, installing the oil cup 20 in the mounting hole 19 of the oil filling seat 18, and making the oil cup 20 opposite to the oil filling hole 17, the user can inject the lubricating oil into the oil filling hole 17 through the oil cup 20, so that the lubricating oil flows into the oil storage ring groove 16. By fitting the two oil seals 21 onto the outside of the piston body 15 , the two oil seals 21 are located on both sides of the oil ring groove 16 , and the two oil seals 21 are fitted against the inner wall of the cylinder body 10 , so that the two oil seals 21 can seal the lubricating oil seals 21 in the oil ring groove 16 , thereby preventing the lubricating oil in the oil ring groove 16 from flowing out, and ensuring that the lubricating oil can lubricate the inner wall of the cylinder body 10 .

[0032] When using the product, first connect the air inlet 12 of the rear end cover 11 to the air source; then, pull the piston rod 14 so that the piston rod 14 drives the piston body 15 to move, so that the oil ring groove 16 on the outer wall of the piston body 15 is opposite to the oil filling hole 17; then, inject lubricating oil into the oil filling hole 17 through the oil cup 20, and make the lubricating oil flow into the oil ring groove 16; then, control the air source and adjust the air pressure to make the piston body 15 move in the cylinder body 10, and then make the piston rod 14 extend and retract on the outside of the cylinder body 10; when the piston body 15 moves in the cylinder body 10, the lubricating oil stored in the oil ring groove 16 will lubricate the inner wall of the cylinder body 10, thereby reducing the wear of the piston body 15 and the cylinder body 10, so as to improve the translational performance of the operation.

[0033] With the above structure, by disposing the oil filling hole 17 on the outer wall of the cylinder body 10 and the oil storage groove 16 on the outer wall of the piston body 15, with the oil filling hole 17 and the oil storage groove 16 facing each other, lubricating oil can enter the oil storage groove 16 through the oil filling hole 17, thereby enabling the oil storage groove 16 to store the lubricating oil. By injecting lubricating oil into the oil storage groove 16 and fitting the oil seal 21 on both sides of the oil storage groove 16 to seal the lubricating oil seal 21 within the oil storage groove 16, compared to applying lubricating oil to the inner wall of the cylinder body 10, lubricating oil waste can be avoided. At the same time, the lubricating oil can also be used to precisely lubricate the contact portion between the piston body 15 and the cylinder body 10, thereby improving the lubrication effect.

[0034] Specifically, a one-way valve is installed on the oil cup 20 to ensure that the lubricating oil can only flow into the oil cup 20 and cannot flow out of the oil cup 20 .

[0035] Specifically, the oil seal 21 is made of rubber or silicone.

[0036] In the embodiment of the present utility model, as Figure 4 and Figure 5 As shown, the self-lubricating cylinder also includes: a first ventilation groove 22, a silencer seat 23 and a muffler 24; the first ventilation groove 22 is arranged in the front end cover 13, the first ventilation groove 22 is located in the cylinder body 10, and the first ventilation groove 22 is opposite to the piston body 15; a second ventilation groove 33 is provided in the silencer seat 23, the silencer seat 23 is installed on the outer side of the front end cover 13, and the second ventilation groove 33 is connected to the first ventilation groove 22; the muffler 24 is a hollow cavity with an opening at one end, the muffler 24 is installed on the silencer seat 23, and the opening of the muffler 24 is connected to the second ventilation groove 33.

[0037] By setting the first ventilation groove 22 in the front end cover 13, the first ventilation groove 22 is located in the cylinder body 10, and the first ventilation groove 22 is opposite to the piston body 15, so that when the piston body 15 moves toward the front end cover 13, the piston body 15 can push the air in the cylinder body 10 into the first ventilation groove 22; by installing the muffler seat 23 on the outside of the front end cover 13, and making the second ventilation groove 33 in the muffler seat 23 opposite to the first ventilation groove 22, so that the front end cover 13 supports the muffler seat 23, so that the air flowing into the first ventilation groove 22 can flow into the second ventilation groove 33; by installing the muffler 24 on the muffler seat 23, and making the opening of the muffler 24 communicate with the second ventilation groove 33, so that the air flowing into the second ventilation groove 33 can flow into the muffler 24, so that the muffler 24 reduces the exhaust noise, thereby improving the user experience.

[0038] In the embodiment of the present utility model, as Figure 5As shown, the self-lubricating cylinder also includes: a receiving groove 25, a first external thread and a mounting nut 26; the receiving groove 25 is arranged on the side of the piston body 15 close to the rear end cover 11, and the receiving groove 25 is arranged around the outside of the piston rod 14; the first external thread is arranged on the outside of the end of the piston rod 14 close to the rear end cover 11; a first internal thread is provided in the mounting nut 26, the mounting nut 26 is sleeved on the outside of the end of the piston rod 14 close to the rear end cover 11, the mounting nut 26 is located in the receiving groove 25, and the mounting nut 26 is in contact with the piston body 15; wherein, the first external thread is adapted to the first internal thread.

[0039] By setting the receiving groove 25 on the side of the piston body 15 close to the rear end cover 11, and making the receiving groove 25 around the outside of the piston rod 14, the end of the piston rod 14 can be hidden in the piston body 15, thereby avoiding interference between the piston rod 14 and the rear end cover 11, thereby improving quality; by setting the first external thread on the outside of one end of the piston rod 14 close to the rear end cover 11, the mounting nut 26 is sleeved on the outside of the piston rod 14, and the refrigerator mounting nut 26 is fit with the piston body 15 to achieve threaded connection between the mounting nut 26 and the piston rod 14, thereby connecting the piston body 15 to the piston rod 14; by locating the mounting nut 26 in the receiving groove 25, the mounting nut 26 can be hidden in the receiving groove 25, thereby avoiding interference between the mounting nut 26 and the rear end cover 11, thereby improving quality.

[0040] In the embodiment of the present utility model, as Figure 3 As shown, the self-lubricating cylinder also includes: a second internal thread and an air intake pipe 27; the second internal thread is arranged in the air intake hole 12; the air intake pipe 27 is a hollow cavity with openings at both ends, and a second external thread is provided on the outer walls of both ends of the air intake pipe 27, and one end of the air intake pipe 27 is embedded in the air intake hole 12; wherein, the second internal thread is adapted to the second external thread.

[0041] By setting a second internal thread in the air inlet hole 12 and embedding one end of the air inlet pipe 27 into the air inlet hole 12, the air inlet pipe 27 is threadedly connected to the rear end cover 11, thereby connecting the air inlet pipe 27 to the rear end cover 11, thereby reducing the difficulty of connecting the air source with the rear end cover 11, thereby improving the user experience.

[0042] In the embodiment of the present utility model, as Figure 2 As shown, the self-lubricating cylinder also includes: a first sealing ring 28; the first sealing ring 28 is an elastomer, two first sealing rings 28 are sleeved on the outside of the cylinder body 10, the two first sealing rings 28 are embedded in the oil filling seat 18, and the two first sealing rings 28 are located on both sides of the oil filling hole 17.

[0043] By sleeved the two first sealing rings 28 on the outside of the cylinder body 10, the two first sealing rings 28 are embedded in the oil filling seat 18, and the two first sealing rings 28 are located on both sides of the oil filling hole 17, so that the two first sealing rings 28 can seal both sides of the oil filling hole 17, thereby preventing the lubricating oil from flowing out from both sides of the oil filling hole 17, thereby improving the sealing performance.

[0044] Specifically, the first sealing ring 28 is made of rubber or silicone.

[0045] In the embodiment of the present utility model, as Figure 2 and Figure 3 As shown, the self-lubricating cylinder also includes: a second sealing ring 29 and a third sealing ring 30; the second sealing ring 29 is an elastomer, and the second sealing ring 29 is sleeved on the outer side of the rear end cover 11, and the second sealing ring 29 is in contact with the inner wall of the cylinder body 10; the third sealing ring 30 is an elastomer, and the third sealing ring 30 is sleeved on the outer side of the front end cover 13, and the third sealing ring 30 is in contact with the inner wall of the cylinder body 10.

[0046] By putting the second sealing ring 29 on the outer side of the rear end cover 11 and fitting the second sealing ring 29 to the inner wall of the cylinder body 10, the second sealing ring 29 can seal the gap between the rear end cover 11 and the cylinder body 10, thereby improving the sealing performance; by putting the third sealing ring 30 on the outer side of the front end cover 13 and fitting the third sealing ring 30 to the inner wall of the cylinder body 10, the third sealing ring 30 can seal the gap between the front end cover 13 and the cylinder body 10, thereby further improving the sealing performance.

[0047] In the embodiment of the present utility model, as Figure 6 As shown, the self-lubricating cylinder also includes: a third external thread, a connecting seat 31 and a connecting groove 32; the third external thread is arranged on the outside of the end of the piston rod 14 located on the outside of the cylinder body 10; a connecting hole is provided in one end of the connecting seat 31, a third internal thread is provided in the connecting hole, and the end of the piston rod 14 located on the outside of the cylinder body 10 is embedded in the connecting hole; the connecting groove 32 is provided in the end of the connecting seat 31 away from the connecting hole; wherein, the third external thread is adapted to the third internal thread.

[0048] By setting the third external thread on the outside of the end of the piston rod 14 located outside the cylinder body 10, and embedding the end of the piston rod 14 located outside the cylinder body 10 into the connecting hole of the connecting seat 31, the piston rod 14 and the connecting seat 31 are threadedly connected, so that the piston rod 14 can drive the connecting seat 31 to move; by setting the connecting groove 32 in the end of the connecting seat 31 away from the connecting hole, the connecting seat 31 can be connected to other components through the connecting groove 32, thereby improving the user experience.

[0049] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise expressly defined, the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are intended only to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connect," "install," and "fix" should be understood in a broad sense. For example, "connection" can mean a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0050] In the description of this utility model, the terms "one embodiment," "some embodiments," "specific embodiments," etc., mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the utility model. In this utility model, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A self-lubricating cylinder, characterized in that: The self-lubricating cylinder comprises: A cylinder body, which is a hollow cavity with openings at both ends; A rear end cover, wherein an air inlet hole is provided in the rear end cover, and at least a portion of the rear end cover is embedded in an opening at one end of the cylinder body; a front end cover, at least a portion of which is embedded in the other end opening of the cylinder body; a piston rod, wherein the piston rod passes through the front end cover, one end of the piston rod is located inside the cylinder body, and the other end of the piston rod is located outside the cylinder body; a piston body, the piston body being located in the cylinder body and connected to one end of the piston rod; an oil storage ring groove, the oil storage ring groove being provided on the outer wall of the piston body; An oil filling hole, the oil filling hole being provided on the outer wall of the cylinder body and being opposite to the oil storage ring groove; An oil filling seat is provided with a mounting hole, the oil filling seat is sleeved on the outside of the cylinder body, and the oil filling seat is located on the outside of the oil filling hole; an oil cup, the oil cup being mounted in the mounting hole and facing the oil filling hole; The oil seal is an elastomer, two of the oil seals are sleeved on the outside of the piston body, the two oil seals are located on both sides of the oil storage ring groove, and the two oil seals are in contact with the inner wall of the cylinder body.

2. A self-lubricating cylinder according to claim 1, characterized in that: The self-lubricating cylinder also includes: a first vent groove, the first vent groove being disposed in the front end cover, the first vent groove being located in the cylinder body, and the first vent groove being opposite to the piston body; A silencer seat, wherein a second vent groove is provided in the silencer seat, the silencer seat is mounted on the outer side of the front end cover, and the second vent groove is connected to the first vent groove; The silencer is a hollow cavity with an opening at one end. The silencer is installed on the silencer seat, and the opening of the silencer is connected to the second ventilation groove.

3. A self-lubricating cylinder according to claim 2, characterized in that: The self-lubricating cylinder also includes: an accommodating groove, the accommodating groove being arranged on a side of the piston body close to the rear end cover and being arranged around an outer side of the piston rod; a first external thread, the first external thread being provided on the outer side of one end of the piston rod close to the rear end cover; a mounting nut having a first internal thread, the mounting nut being sleeved on the outer side of one end of the piston rod close to the rear end cover, the mounting nut being located in the receiving groove, and the mounting nut being in contact with the piston body; Wherein, the first external thread is adapted to the first internal thread.

4. A self-lubricating cylinder according to claim 3, characterized in that: The self-lubricating cylinder also includes: a second internal thread, the second internal thread being disposed in the air inlet; An air intake pipe, the air intake pipe being a hollow cavity with openings at both ends, second external threads being provided on the outer walls of both ends of the air intake pipe, and one end of the air intake pipe being embedded in the air intake hole; Wherein, the second internal thread is adapted to the second external thread.

5. The self-lubricating cylinder according to claim 1, characterized in that: The self-lubricating cylinder also includes: The first sealing ring is an elastomer, two of the first sealing rings are sleeved on the outside of the cylinder body, two of the first sealing rings are embedded in the oil filling seat, and the two first sealing rings are located on both sides of the oil filling hole.

6. The self-lubricating cylinder according to claim 5, characterized in that: The self-lubricating cylinder also includes: a second sealing ring, which is an elastic body and is sleeved on the outer side of the rear end cover and fits against the inner wall of the cylinder body; The third sealing ring is an elastic body, and the third sealing ring is sleeved on the outer side of the front end cover, and the third sealing ring is in contact with the inner wall of the cylinder body.

7. The self-lubricating cylinder according to claim 6, characterized in that: The self-lubricating cylinder also includes: a third external thread, the third external thread being provided on the outer side of one end of the piston rod located outside the cylinder body; A connecting seat, wherein a connecting hole is provided in one end of the connecting seat, a third internal thread is provided in the connecting hole, and an end of the piston rod located outside the cylinder body is embedded in the connecting hole; a connecting groove, the connecting groove being arranged in an end of the connecting seat away from the connecting hole; Wherein, the third external thread is adapted to the third internal thread.

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