Cylinder with self-lubricating function

Abstract

The utility model discloses a cylinder with self -lubricating function, include: cylinder body, the top and bottom of cylinder body lateral wall all are seted up with the air -guiding hole, piston, slide in the cylinder body, just the piston slides between two the air -guiding hole, the piston coaxially fixed has piston rod, end cover, fixedly set up in the end of cylinder body, the piston hole that the piston rod moves is seted up with on the end cover, the storage cavity that sets up around the piston hole is seted up with in the end cover, the end cover lateral wall and be located the position of piston hole seted up with multiple groups of moving groove, the utility model discloses through the passageway of pressurized lubricating liquid in the storage cavity continuously delivery to the lubricating ball, can in the piston rod moving process, to the piston rod is self -lubricating, forms the continuous lubricating film, and the rolling contact between lubricating ball and piston rod significantly reduces the friction resistance.

Description

Technical Field

[0001] This utility model relates to the field of cylinder technology, and in particular to a cylinder with self-lubricating function. Background Technology

[0002] With the development of industrial automation production technology, cylinders are being used more and more frequently. During operation, the piston of a cylinder needs to reciprocate continuously. However, with prolonged use, existing cylinders may experience piston rod movement difficulties, affecting cylinder operation. This necessitates applying grease to the lubrication points. However, in practice, this lubrication method leads to excessive grease buildup at both ends of the piston rod's stroke, while the middle area suffers from insufficient lubrication, creating an uneven phenomenon of "excess at both ends and lack in the middle." Therefore, a self-lubricating cylinder is proposed to solve this problem. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing the following technical solution:

[0004] A self-lubricating cylinder includes:

[0005] The cylinder body has air guide holes at the top and bottom of its sidewalls;

[0006] A piston is slidably disposed within the cylinder body, and the piston slides between the two air guide holes; a piston rod is coaxially fixed to the piston;

[0007] An end cap is fixedly disposed at the end of the cylinder body. The end cap has a piston hole for the piston rod to move. A storage cavity is disposed around the piston hole inside the end cap. Multiple sets of moving grooves are provided on the side wall of the end cap at the position of the piston hole.

[0008] A lubrication assembly is disposed within the movable groove. One end of the lubrication assembly facing the piston rod is rotatably connected to a lubrication ball, and the other end of the lubrication assembly is connected to the storage cavity.

[0009] As an improvement to the above technical solution, the lubrication assembly further includes a fixed tube that is movably inserted into the movable groove. An expansion portion is connected to one end of the fixed tube facing the piston rod. A lubricating ball is rotatably connected to the end of the expansion portion away from the fixed tube. Multiple sets of through holes arranged in a ring array are opened on the circumferential surface of one end of the fixed tube located in the storage cavity.

[0010] As an improvement to the above technical solution, a spring is wound around the surface of the fixed tube and inside the moving groove.

[0011] As an improvement to the above technical solution, a fixing sleeve is fixedly installed inside the storage cavity and around the fixing tube. The fixing sleeve is movably inserted into the fixing tube, and the fixing sleeve has a through hole one that matches the position and number of the through hole two.

[0012] As an improvement to the above technical solution, annular grooves for resetting the lubrication assembly are provided at both ends of the piston rod.

[0013] The beneficial effects of this utility model are:

[0014] The pressurized lubricating fluid in the storage chamber is continuously delivered to the lubricating ball through the channel, which can self-lubricate the piston rod during the piston rod movement, forming a continuous lubricating film. At the same time, the rolling contact between the lubricating ball and the piston rod significantly reduces frictional resistance. Attached Figure Description

[0015] Figure 1 This is a front view of the overall structure of this utility model;

[0016] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0017] Reference numerals: 10, cylinder body; 11, air vent; 12, end cap; 121, storage cavity; 122, moving groove; 123, fixed sleeve; 124, through hole one; 20, piston; 21, piston rod; 211, annular groove; 30, expansion part; 31, lubricating ball; 32, fixed tube; 33, spring; 34, through hole two. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] A self-lubricating cylinder includes:

[0020] The cylinder body 10 has air guide holes 11 at the top and bottom of its sidewalls;

[0021] The piston 20 is slidably disposed within the cylinder 10, and the piston 20 slides between the two air guide holes 11; a piston rod 21 is coaxially fixed on the piston 20;

[0022] End cap 12 is fixedly disposed at the end of cylinder body 10. End cap 12 has a piston hole for piston rod 21 to move. End cap 12 has a storage cavity 121 surrounding the piston hole. Multiple sets of moving grooves 122 are provided on the side wall of end cap 12 at the position of piston hole.

[0023] A lubrication assembly is disposed in the movable groove 122. One end of the lubrication assembly facing the piston rod 21 is rotatably connected to a lubrication ball 31, and the other end of the lubrication assembly is connected to the storage cavity 121.

[0024] Specifically, the top and bottom air guide holes 11 of the cylinder body 10 are connected to the air source respectively. When compressed air is introduced into one of the air guide holes, the air pressure pushes the piston 20 to slide in the cylinder body, and the piston rod 21 extends or retracts accordingly to achieve linear reciprocating motion. The storage cavity 121 inside the end cover 12 is pre-filled with lubricating fluid through the feed pipe and pressurized into the storage cavity 121. The lubrication component is pushed towards the piston rod 21 under the action of its elastic force to ensure that the lubricating ball 31 is always in contact with the piston rod. When the lubricating fluid in the storage cavity 121 flows into the lubrication component due to pressure, the lubricating fluid is transported to the lubricating ball 31 through the channel. When the piston rod 21 moves back and forth, the lubricating ball 31 rolls on the piston rod surface to form rolling friction. At the same time, the lubricating ball evenly coats the piston rod surface with lubricating fluid to form a lubricating film, thereby achieving dynamic continuous lubrication and extending the cylinder life.

[0025] In one embodiment, the lubrication assembly further includes a fixed tube 32 movably inserted into the movable groove 122. An enlarged portion 30 is connected to one end of the fixed tube 32 facing the piston rod 21. A lubricating ball 31 is rotatably connected to the end of the enlarged portion 30 away from the fixed tube 32. Multiple sets of through holes 34 arranged in a ring array are formed on the circumferential surface of the end of the fixed tube 32 located within the storage cavity 121. The interior of the fixed tube 32 is hollow, serving as the core channel for lubricant to flow from the storage cavity 121 to the lubricating ball 31. The enlarged portion 30 is located at the front end of the fixed tube 32, and its diameter is larger than the inner diameter of the fixed tube 32, forming a funnel-shaped structure, allowing the lubricant to flow out... The lubricating fluid diffuses more evenly, avoiding concentrated accumulation. At the same time, the lubricating ball 31 is rotatably connected inside the expansion part 30, ensuring that the lubricating ball can roll freely when the piston rod 21 moves, while restricting its radial displacement. The through holes 34 are distributed in a ring array around the fixed tube, allowing the lubricating fluid in the storage cavity 121 to flow into the fixed tube 32 from multiple directions, avoiding uneven flow or blockage caused by a single inlet, and ensuring stable flow of lubricating fluid. The lubricating fluid in the storage cavity 121 enters the fixed tube 32 through the through holes 34 around the fixed tube 32. The lubricating fluid flows forward in the fixed tube 32, and when it reaches the expansion part 30, it slows down and diffuses due to the expansion of the channel, forming a more uniform grease layer. Subsequently, the lubricant flows to the gap between the enlarged part 30 and the lubricating ball 31. When the piston rod 21 reciprocates, the lubricating ball 31 rolls under the action of friction, and the lubricant on the surface is evenly coated on the surface of the piston rod 21. Since the enlarged part 30 restricts the movement of the lubricating ball 31, the lubricating ball 31 always maintains close contact with the piston rod 21, ensuring that the lubricating film is continuously formed.

[0026] In one embodiment, a spring 33 is wound around the surface of the fixed tube 32 and within the moving groove 122. The spring 33, wound around the surface of the fixed tube 32, generates a thrust that pushes the fixed tube 32 and the lubricating ball 31 toward the piston rod 21. Even if there are minor bumps or installation errors on the surface of the piston rod 21, the spring 33 can still ensure that the lubricating ball 31 is always in close contact with the piston rod 21, avoiding lubrication failure due to gaps. As the cylinder runs for a long time, the contact surface between the lubricating ball 31 and the piston rod 21 will gradually wear. The elastic deformation of the spring 33 can dynamically compensate for this wear, maintain continuous contact pressure, and extend the effective life of the lubrication assembly.

[0027] In one embodiment, both ends of the piston rod 21 are provided with annular grooves 211 for resetting the lubrication assembly. When the piston rod 21 moves to the end of its stroke or is in the initial position, the annular grooves 211 are aligned with the lubrication ball 31. At this time, the lubrication ball is inserted into the annular grooves 211 under the push of the spring 33. At this time, the through hole 34 on the fixed tube 32 moves into the moving groove. At this time, the communication between the storage cavity 121 and the fixed tube 32 is cut off to prevent the lubricant from continuing to flow in and to avoid leakage or waste caused by excessive oil supply.

[0028] In one embodiment, a fixing sleeve 123 is fixedly disposed within the storage cavity 121 and around the fixing tube 32. The fixing sleeve 123 is movably inserted into the fixing tube 32. The fixing sleeve 123 has through holes 124 that match the position and number of through holes 2 34. The fixing sleeve 123 is fixed within the storage cavity 121 and movably inserted into the fixing tube 32. The fixing sleeve 123 restricts the radial sway of the fixing tube 32. When the fixing tube 32 moves axially, lubricant can only flow from the storage cavity 121 into the fixing tube 32 when through holes 1 124 and through holes 2 34 are connected. To achieve a secondary sealing effect, when the piston rod 21 is in the middle of its stroke (not at the end point), the lubricating ball 31 is not embedded in the annular groove 211, so that the second through hole 34 is completely aligned with the first through hole 124 of the fixed sleeve. The lubricant in the storage cavity 121 passes through the first through hole 124 → the second through hole 34 → the inside of the fixed tube 32 → the expansion part 30 → the lubricating ball 31, and finally coats the surface of the piston rod 21. When the piston 20 reaches the end of its stroke, the lubricating ball 31 is embedded in the annular groove 211, and the second through hole 34 is completely misaligned with the first through hole 124. The flow of lubricant is cut off, preventing the grease in the storage cavity 121 from continuing to flow into the fixed tube 32.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A cylinder with self-lubricating function, characterized in that, include: The cylinder body (10) has air guide holes (11) at the top and bottom of the side wall; A piston (20) is slidably disposed within the cylinder (10), and the piston (20) slides between the two air guide holes (11); a piston rod (21) is coaxially fixed on the piston (20); An end cap (12) is fixedly disposed at the end of the cylinder body (10). The end cap (12) has a piston hole for the piston rod (21) to move. The end cap (12) has a storage cavity (121) surrounding the piston hole. The end cap (12) has multiple sets of moving grooves (122) on its side wall at the position of the piston hole. A lubrication assembly is disposed in the movable groove (122). One end of the lubrication assembly facing the piston rod (21) is rotatably connected to a lubrication ball (31), and the other end of the lubrication assembly is connected to the storage cavity (121).

2. A cylinder with self-lubricating function according to claim 1, characterized in that: The lubrication assembly also includes a fixed tube (32) that is movably inserted into the movable groove (122). An enlarged part (30) is connected to one end of the fixed tube (32) facing the piston rod (21). A lubricating ball (31) is rotatably connected to the other end of the enlarged part (30) away from the fixed tube (32). Multiple sets of through holes (34) arranged in a ring array are opened on the circumferential surface of one end of the fixed tube (32) located in the storage cavity (121).

3. A cylinder with self-lubricating function according to claim 2, characterized in that: A spring (33) is wound on the surface of the fixed tube (32) and inside the moving groove (122).

4. A cylinder with self-lubricating function according to claim 3, characterized in that: A fixing sleeve (123) is fixedly installed inside the storage cavity (121) and around the fixing tube (32). The fixing sleeve (123) is movably inserted into the fixing tube (32). The fixing sleeve (123) has a through hole (124) that matches the position and number of the through hole (34).

5. A cylinder with self-lubricating function according to claim 4, characterized in that: Both ends of the piston rod (21) are provided with annular grooves (211) for the lubrication assembly to reset.

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