Self-lubricating bearing
By employing a sealing component design in the self-lubricating bearing, the problem of easy leakage from the oil injection hole is solved, achieving internal sealing and stability of the lubrication environment, thus ensuring long-term reliable operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 上海恒能轴承有限公司
- Filing Date
- 2025-10-30
- Publication Date
- 2026-07-21
AI Technical Summary
The existing self-lubricating bearings have a simple oil filling hole sealing structure design, which is prone to lubricating oil leakage or external dust and moisture entering due to vibration or temperature changes, thus affecting the lubrication effect.
The sealing assembly includes a plug, a sealing plate, a limiting plate, and a limiting component. Through the synergistic action of the conical surface, a miniature spring, a universal ball, and a sealing ring, a double seal is achieved on the oil injection hole, blocking the lubricating oil leakage channel and preventing external contaminants from entering.
It effectively prevents lubricating oil leakage, keeps the internal lubrication environment of the bearing clean, prevents external dust and moisture from entering, and ensures stable operation of the equipment.
Smart Images
Figure CN224533281U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bearing technology, specifically to a self-lubricating bearing. Background Technology
[0002] Self-lubricating bearings, as core components in the field of mechanical transmission, are widely used in automobiles, construction machinery, machine tools, and home appliances due to their characteristic of not requiring frequent external lubrication. Their core function is to reduce friction and wear between the inner and outer bearing rings and balls through a lubricating oil film, ensuring stable operation of the equipment. In actual use, self-lubricating bearings need to be replenished with lubricating oil through the oil injection hole to maintain the lubrication effect. However, the existing technology has many shortcomings: the sealing structure of the oil injection hole is simply designed, often using a single rubber plug or threaded plug. After long-term use, it is prone to loosening due to vibration and temperature changes, leading to lubricating oil leakage or external dust and moisture entering the bearing, which damages the lubrication environment. Therefore, it is necessary to improve the existing technology. Utility Model Content
[0003] The purpose of this invention is to provide a self-lubricating bearing to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a self-lubricating bearing, comprising an inner bearing ring and an outer bearing ring, wherein the outer bearing ring is sleeved on the outside of the inner bearing ring, and ball grooves are provided on both the outer side of the inner bearing ring and the inner side of the outer bearing ring, and bearing balls are rotatably disposed inside the ball grooves. An oil injection hole is provided on the outer surface of the outer bearing ring; a sealing assembly is inserted into the oil injection hole, the sealing assembly comprising a plug inserted into the oil injection hole, the outer wall of the plug being provided with a conical surface, a sealing plate being installed at the end of the plug, and limit plates being installed on both the left and right sides of the sealing plate, with limit components vertically installed on the side walls of the limit plates. Limit holes are provided at both ends of the oil injection hole on the outer surface of the outer bearing ring, and through openings are provided on both sides of the inner wall of the oil injection hole, and the through openings are connected to the limit holes. The limit plates are inserted into the through openings, and the ends of the limit components are disposed in the limit holes.
[0005] Preferably, the limiting assembly includes a fixing plate installed on the side wall of the limiting plate, a miniature spring is vertically installed on the side wall of the fixing plate, a universal seat is installed at the end of the miniature spring, a universal ball is installed inside the universal seat, and the universal ball is inserted into the limiting hole.
[0006] Preferably, the inner wall of the universal joint is provided with rotating cavities evenly spaced along its axis, and ball bearings are installed inside the rotating cavities, with the ball bearings fitting snugly against the universal ball bearings.
[0007] Preferably, the outer wall of the universal joint is fitted with a sealing ring, and the outer wall of the sealing ring is fitted to the inner wall of the limiting hole.
[0008] Preferably, an elastic washer is fitted on the upper outer end of the sealing plate, and the outer wall of the elastic washer is provided with a smooth surface, which is fitted to the inner wall of the oil injection hole.
[0009] Preferably, the elastic washer ring has a filling cavity inside, and an arched elastic plate is disposed inside the filling cavity.
[0010] Preferably, the outer wall of the bearing ball is provided with a spiral oil storage groove, and the inner walls on both sides of the spiral oil storage groove are provided with inclined oil grooves.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This device achieves a double seal for the oil injection hole through the synergistic action of the sealing assembly, the sealing plate, and the limiting assembly: the miniature spring of the limiting assembly pushes the universal ball to engage in the limiting hole, ensuring that the sealing assembly is firmly installed and preventing loosening due to vibration; the sealing ring and the elastic gasket ring respectively fit against the inner walls of the limiting hole and the oil injection hole, blocking the lubricating oil leakage channel, while preventing external dust and moisture from entering the bearing, ensuring a clean lubrication environment. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of part A of the present invention; Figure 4 This is a schematic diagram of the sealing assembly of this utility model; Figure 5 This is a schematic diagram of the limiting component of this utility model; Figure 6 This is a schematic diagram of the elastic washer ring of this utility model.
[0013] In the diagram: 1. Outer bearing ring; 2. Inner bearing ring; 3. Ball groove; 4. Inclined oil groove; 5. Spiral oil reservoir; 6. Bearing ball; 7. Oil injection hole; 8. Sealing assembly; 9. Limiting hole; 10. Limiting assembly; 11. Elastic washer ring; 12. Sealing plate; 13. Hole plug; 14. Conical surface; 15. Limiting plate; 16. Smooth surface; 17. Fixing plate; 18. Miniature spring; 19. Universal seat; 20. Sealing ring; 21. Universal ball; 22. Rotating cavity; 23. Ball; 24. Filling cavity; 25. Arched elastic plate. Detailed Implementation
[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0015] Please see Figures 1-6 As shown, a self-lubricating bearing includes an inner bearing ring 2 and an outer bearing ring 1. The outer bearing ring 1 is sleeved on the outside of the inner bearing ring 2. Ball grooves 3 are provided on the outer side of the inner bearing ring 2 and the inner side of the outer bearing ring 1. Bearing balls 6 are rotatably arranged inside the ball grooves 3. An oil injection hole 7 is provided on the outer surface of the outer bearing ring 1. A sealing component 8 is inserted into the oil injection hole 7. The sealing component 8 includes a plug 13 inserted into the oil injection hole 7. The outer wall of the plug 13 is provided with a conical surface 14. A sealing plate 12 is installed at the end of the plug 13. Limiting plates 15 are installed on both sides of the sealing plate 12. Limiting components 10 are vertically installed on the side walls of the limiting plates 15. Limiting holes 9 are provided at both ends of the oil injection hole 7 on the outer surface of the outer bearing ring 1. Through openings are provided on both sides of the inner wall of the oil injection hole 7, and the through openings are connected to the limiting holes 9. The limiting plates 15 are inserted into the through openings. The end of the limiting component 10 is located in the limiting hole 9.
[0016] In the specific implementation process, the outer bearing ring 1 and the inner bearing ring 2 adopt a coaxial sleeve design. Their relative positions are precisely defined by the cooperation of the ball groove 3 and the bearing ball 6, ensuring coaxiality during rotation. The ball groove 3 on the outer side of the inner bearing ring 2 and the inner side of the outer bearing ring 1 is an arc-shaped groove structure. Its curvature matches the spherical curvature of the bearing ball 6, which can increase the contact area between the bearing ball 6 and the groove wall, disperse pressure and reduce local wear. The oil injection hole 7 on the outer surface of the outer bearing ring 1 is a stepped hole structure. The inner hole diameter is slightly smaller than the outer hole diameter, which forms a close fit with the conical surface 14 of the outer wall of the plug 13. The diameter of the sealing plate 12 is larger than the outer hole diameter of the oil injection hole 7, forming an end face stop structure to prevent the plug 13 from being excessively inserted into the bearing. The thickness of the limiting plate 15 is matched with the width clearance of the through-holes on both sides of the oil injection hole 7, ensuring that the limiting plate 15 can slide smoothly along the through-hole, providing guidance for the docking of the limiting component 10 and the limiting hole 9.
[0017] In some technical solutions, the limiting component 10 includes a fixing plate 17 installed on the side wall of the limiting plate 15. A miniature spring 18 is vertically installed on the side wall of the fixing plate 17. A universal seat 19 is installed at the end of the miniature spring 18. A universal ball 21 is installed inside the universal seat 19 and is inserted into the limiting hole 9.
[0018] In the specific implementation process, the limiting component 10 is rigidly connected to the limiting plate 15 through the fixing plate 17 to ensure structural stability. The universal seat 19 is a hollow hemispherical structure, and the curvature of its inner wall matches the spherical surface of the universal ball 21, so that the universal ball 21 can rotate flexibly in the universal seat 19. When the sealing component 8 is disassembled and assembled, the contact between the universal ball 21 and the inner wall of the limiting hole 9 is rolling friction, which greatly reduces the insertion and extraction resistance and solves the problem of easy jamming of the traditional rigid limiting structure. The limiting hole 9 is a spherical groove structure, and its inner diameter is transitionally matched with the diameter of the universal ball 21, which not only ensures that the universal ball 21 is firmly engaged, but also prevents disassembly and assembly difficulties due to excessive interference.
[0019] In some technical solutions, the inner wall of the universal seat 19 is provided with rotating cavities 22 evenly spaced along its axis, and ball bearings 23 are installed inside the rotating cavities 22, with the ball bearings 23 fitting together with the universal ball 21.
[0020] In the specific implementation process, the rotating cavity 22 on the inner wall of the universal seat 19 is a circular groove, and the number of them is set to four, which are evenly distributed along the axis of the universal seat 19 to ensure that the universal ball 21 is subjected to balanced force. The ball 23 inside the rotating cavity 22 has a point contact fit with the universal ball 21, which can convert the sliding friction between the universal ball 21 and the universal seat 19 into rolling friction, further reducing the rotational resistance of the universal ball 21, making the engagement and disengagement of the limiting component 10 smoother. The diameter of the ball 23 is smaller than the depth of the rotating cavity 22 to prevent the ball 23 from falling out of the rotating cavity 22, while ensuring its effective fit with the universal ball 21 and ensuring transmission stability.
[0021] In some technical solutions, the outer wall of the universal seat 19 is fitted with a sealing ring 20, and the outer wall of the sealing ring 20 is fitted to the inner wall of the limiting hole 9.
[0022] In the specific implementation process, the sealing ring 20 on the outer wall of the universal joint 19 is made of nitrile rubber, which has good elasticity and oil resistance and can adapt to temperature changes during bearing operation. The outer diameter of the sealing ring 20 is slightly larger than the inner diameter of the limiting hole 9, forming an interference fit. Its outer wall fits tightly with the inner wall of the limiting hole 9, which can block the leakage of lubricating oil from the gap between the limiting component 10 and the limiting hole 9, and at the same time prevent external dust and moisture from entering the bearing through the gap, further improving the sealing and protection effect. The sealing ring 20 and the universal joint 19 are an interference fit set, which is not easy to fall off after installation, ensuring the sealing reliability during long-term use.
[0023] In some technical solutions, an elastic gasket 11 is fitted on the upper outer side of the sealing plate 12. The outer wall of the elastic gasket 11 is provided with a smooth surface 16, which fits against the inner wall of the oil injection hole 7.
[0024] In the specific implementation process, the elastic gasket 11 on the outside of the sealing plate 12 is made of silicone, which has excellent elastic recovery ability and aging resistance. The smooth surface 16 of the outer wall of the elastic gasket 11 is polished to reduce the frictional resistance with the inner wall of the oil injection hole 7, which facilitates the insertion and removal of the sealing assembly 8 and reduces wear during long-term use. The inner diameter of the elastic gasket 11 is interference-fitted with the outer diameter of the sealing plate 12 to ensure a firm installation. Its axial length is matched with the length of the outer section of the oil injection hole 7, which can completely fill the outer gap of the oil injection hole 7, forming a double seal on the end face and side.
[0025] In some technical solutions, the elastic pad ring 11 has a filling cavity 24 inside, and an arched elastic plate 25 is provided inside the filling cavity 24.
[0026] In the specific implementation process, the filling cavity 24 inside the elastic gasket 11 is an annular cavity, which can increase the deformation of the elastic gasket 11, so that it can better fit the tiny unevenness of the inner wall of the oil injection hole 7 and improve the sealing performance. The arched elastic plate 25 inside the filling cavity 24 is made of spring steel. Its arched structure has good elastic recovery ability and can support the elastic gasket 11, preventing the elastic gasket 11 from permanent deformation after long-term pressure.
[0027] In some technical solutions, the outer wall of the bearing ball 6 is provided with a spiral oil reservoir 5, and the inner walls on both sides of the spiral oil reservoir 5 are provided with inclined oil reservoirs 4.
[0028] In practical implementation, the spiral oil reservoir 5 on the outer wall of the bearing ball 6 is a continuous spiral structure with a pitch set to 1 / 3-1 / 2 of the diameter of the bearing ball 6. This increases the oil storage volume, allowing for more lubricating oil to be stored and extending the lubrication cycle. The inclined oil grooves 4 on both sides of the spiral oil reservoir 5 are inclined recesses connected to the spiral oil reservoir 5. These inclined grooves 4 are inclined towards the contact area between the bearing ball 6 and the ball groove 3. When the bearing ball 6 rotates, centrifugal force guides the lubricating oil in the spiral oil reservoir 5 through the inclined oil grooves 4 to the contact surface, forming a uniform and stable oil film. The depth of the inclined oil grooves 4 is less than the depth of the spiral oil reservoir 5, preventing excessive lubricating oil loss while ensuring sufficient lubricating oil supply in the contact area, effectively reducing friction and wear.
[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A self-lubricating bearing, comprising an inner bearing ring (2) and an outer bearing ring (1), characterized in that: The outer bearing ring (1) is sleeved on the outside of the inner bearing ring (2). Both the outer side of the inner bearing ring (2) and the inner side of the outer bearing ring (1) are provided with ball grooves (3), and bearing balls (6) are rotatably arranged inside the ball grooves (3). The outer surface of the outer bearing ring (1) is provided with oil injection holes (7). A sealing assembly (8) is inserted inside the oil injection hole (7). The sealing assembly (8) includes a plug (13) inserted into the oil injection hole (7). The outer wall of the plug (13) is provided with a conical surface (14). A sealing plate (12) is installed at the end of the plug (13). Limiting plates (15) are installed on both the left and right sides of the sealing plate (12). A limiting assembly (10) is vertically installed on the side wall of the limiting plate (15). Limiting holes (9) are opened at both ends of the outer surface of the outer bearing ring (1) at the oil injection hole (7). Openings are opened on both sides of the inner wall of the oil injection hole (7), and the openings are connected to the limiting holes (9). The limiting plate (15) is inserted into the opening. The end of the limiting assembly (10) is set in the limiting hole (9).
2. The self-lubricating bearing according to claim 1, characterized in that: The limiting component (10) includes a fixing plate (17) installed on the side wall of the limiting plate (15). A miniature spring (18) is vertically installed on the side wall of the fixing plate (17). A universal seat (19) is installed at the end of the miniature spring (18). A universal ball (21) is installed inside the universal seat (19). The universal ball (21) is inserted into the limiting hole (9).
3. A self-lubricating bearing according to claim 2, characterized in that: The inner wall of the universal seat (19) is provided with rotating cavities (22) evenly spaced along its axis. Ball bearings (23) are installed inside the rotating cavities (22) and are fitted to the universal ball (21).
4. A self-lubricating bearing according to claim 3, characterized in that: The outer wall of the universal joint (19) is fitted with a sealing ring (20), and the outer wall of the sealing ring (20) is fitted to the inner wall of the limiting hole (9).
5. A self-lubricating bearing according to claim 1, characterized in that: An elastic washer (11) is fitted on the upper outer end of the sealing plate (12). The outer wall of the elastic washer (11) is provided with a smooth surface (16), and the smooth surface (16) is fitted to the inner wall of the oil injection hole (7).
6. A self-lubricating bearing according to claim 5, characterized in that: The elastic pad ring (11) has a filling cavity (24) inside, and an arched elastic plate (25) is provided inside the filling cavity (24).
7. A self-lubricating bearing according to claim 1, characterized in that: The outer wall of the bearing ball (6) is provided with a spiral oil storage groove (5), and the inner walls on both sides of the spiral oil storage groove (5) are provided with inclined oil grooves (4).