Self-lubricating powder metallurgy oil bearing

Abstract

The utility model discloses a self-lubricating powder metallurgy oil-retaining bearing, and particularly relates to the technical field of bearings, the self-lubricating powder metallurgy oil-retaining bearing comprises a bearing inner ring, a bearing outer ring is arranged on the outer side of the bearing inner ring, a rolling body is arranged between the bearing inner ring and the bearing outer ring, a retainer is arranged on the outer side of the rolling body, and a self-lubricating mechanism is arranged in the rolling body; the self-lubricating mechanism comprises an oil storage cavity, and the oil storage cavity is formed in the rolling body. Through cooperative operation of the self-lubricating mechanism, the oil storage cavity, the connecting hole, the flow limiting plate, the oil storage hole, the oil outlet hole and the grease retainer, precise and stable seepage and retaining of lubricating oil are achieved, when the bearing works, the surface of the rolling body can continuously obtain a proper amount of lubricating oil, the self-lubricating performance is remarkably improved, energy loss can be effectively reduced, and the service life of the bearing is prolonged. All the components cooperate to provide sufficient lubrication and disperse pressure, stable operation of the bearing is ensured, and deformation or damage caused by insufficient lubrication is not prone to occurring.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and more specifically, to a self-lubricating powder metallurgy oil-impregnated bearing. Background Technology

[0002] Powder metallurgy oil-impregnated bearings are bearings with self-lubricating properties manufactured through powder metallurgy processes. In the field of modern mechanical equipment, powder metallurgy oil-impregnated bearings are widely used in various types of equipment due to their cost advantages, vibration absorption, and noise reduction characteristics.

[0003] A search revealed Chinese patent CN212272622U, which discloses a high-speed, high-wear-resistant powder metallurgy oil-impregnated bearing. Addressing the issues in DC fan applications, ordinary powder metallurgy oil-impregnated bearings suffer from problems such as easy wear of the inner diameter, resulting in a short service life. Furthermore, the high-temperature gas generated by the friction between the DC fan motor's drive shaft and the bearing body is obstructed by the oil rings and washer at both ends of the bearing body, forming nitrides that easily accumulate in the gap between the drive shaft and the bearing body, hindering smooth motor operation. This patent lubricates the contact surface between the motor's drive shaft and the bearing body, significantly reducing friction, resulting in good wear resistance and a long service life. Simultaneously, it effectively dissipates the high-temperature gas generated by the friction between the DC fan motor's drive shaft and the bearing body, ensuring smooth motor operation.

[0004] Oil-impregnated bearings have a simple internal structure and an inadequate lubricant storage and release mechanism. Their lubricant storage space often lacks effective zoning and control, making it difficult to achieve precise and stable lubricant seepage. During operation, the lubricant is easily consumed quickly and cannot continuously provide adequate lubrication to the contact surfaces of the rolling elements and the inner and outer rings, resulting in a high coefficient of friction, severe energy loss, and low operating efficiency of mechanical equipment. Utility Model Content

[0005] In order to overcome the problems and defects in the prior art, this utility model provides a self-lubricating powder metallurgy oil-impregnated bearing to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a self-lubricating powder metallurgy oil-impregnated bearing, comprising an inner bearing ring, an outer bearing ring disposed outside the inner bearing ring, a rolling element installed between the inner bearing ring and the outer bearing ring, a cage disposed outside the rolling element, and a self-lubricating mechanism disposed inside the rolling element;

[0007] The self-lubricating mechanism includes an oil storage chamber located inside the rolling element. A connecting hole is provided on the inner wall surface of the oil storage chamber. A flow limiting plate is fixedly connected to both sides of the inner wall of the connecting hole. The rolling element has an oil storage orifice, and an oil outlet orifice is provided on the outer surface of the rolling element. A grease retainer is installed inside the oil outlet orifice.

[0008] Preferably, the oil storage pores and the oil storage cavity are connected by a connecting hole, and the oil outlet pores are connected to the oil storage pores.

[0009] Preferably, the number of the retainers is set to multiple, and a connecting rod is fixedly connected between two of the retainers.

[0010] Preferably, the bearing outer ring has a lubricating oil cavity inside, and the inner wall surface of the lubricating oil cavity has multiple oil outlet holes.

[0011] Preferably, the plurality of oil outlet holes are evenly distributed on the inner wall surface of the outer ring of the bearing.

[0012] Preferably, the outer surface of the bearing outer ring is provided with an oil filling port, and a sealing plug is installed inside the oil filling port.

[0013] Preferably, the number of oil outlet pores corresponds one-to-one with the number of oil storage pores, and the diameter of the oil outlet pores is smaller than the diameter of the oil storage pores.

[0014] Preferably, both the inner wall surface of the bearing outer ring and the outer wall surface of the bearing inner ring are coated with molybdenum disulfide.

[0015] The technical effects and advantages of this utility model are as follows:

[0016] 1. By setting up a self-lubricating mechanism, the oil reservoir, connecting hole, flow restrictor, oil reservoir orifice, oil outlet orifice, and grease retainer work together to achieve precise and stable seepage and retention of lubricating oil. When the bearing is working, the rolling element surface can continuously obtain an appropriate amount of lubricating oil, which works together with the lubricating oil released from the inner cavity of the outer ring of the bearing through the oil outlet, greatly reducing the friction coefficient between the rolling element and the inner and outer rings of the bearing. Compared with traditional oil-impregnated bearings, the self-lubricating performance is significantly improved, which can effectively reduce energy loss and improve the operating efficiency of mechanical equipment. Under high load conditions, each component works together to provide sufficient lubrication, disperse pressure, ensure stable operation of the bearing, and prevent deformation or damage caused by insufficient lubrication.

[0017] 2. The continuous lubrication of the rolling elements reduces the wear rate when in contact with the inner and outer rings. The molybdenum disulfide coating on the inner wall of the bearing outer ring and the outer wall of the bearing inner ring prevents direct dry friction when the lubricating oil is insufficient, further reducing wear. At the same time, the synergistic effect of the entire lubrication system keeps the wear of each component at a low level during long-term operation, reducing the frequency of equipment maintenance and bearing replacement. The oil replenishment port and sealing plug on the outer surface of the bearing outer ring facilitates replenishment when the lubricating oil in the inner cavity is insufficient, without disassembling the entire bearing, making the operation simple and quick. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a front cross-sectional view of the present invention.

[0020] Figure 3 This is a schematic diagram of the internal structure of the rolling element of this utility model.

[0021] Figure 4 This is a schematic diagram of the internal structure of the bearing outer ring of this utility model.

[0022] Figure 5 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0023] The attached figures are labeled as follows: 1. Inner ring of bearing; 2. Outer ring of bearing; 3. Rolling element; 4. Cage; 5. Connecting rod; 6. Oil reservoir; 7. Connecting hole; 8. Flow restrictor; 9. Oil reservoir orifice; 10. Oil outlet orifice; 11. Grease retainer; 12. Lubricating oil cavity; 13. Oil outlet; 14. Oil replenishment port; 15. Sealing plug. Detailed Implementation

[0024] 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.

[0025] As attached Figure 1-5 The self-lubricating powder metallurgy oil-impregnated bearing shown includes an inner bearing ring 1, an outer bearing ring 2 disposed outside the inner bearing ring 1, a rolling element 3 installed between the inner bearing ring 1 and the outer bearing ring 2, a cage 4 disposed outside the rolling element 3, and a self-lubricating mechanism disposed inside the rolling element 3.

[0026] The self-lubricating mechanism includes an oil reservoir 6, which is located inside the rolling body 3. The inner wall surface of the oil reservoir 6 is provided with a connecting hole 7. Both sides of the inner wall of the connecting hole 7 are fixedly connected to flow limiting plates 8. The rolling body 3 is provided with an oil storage hole 9. The outer surface of the rolling body 3 is provided with an oil outlet hole 10. A grease retainer 11 is installed inside the oil outlet hole 10.

[0027] As attached Figure 2 , 3 As shown in Figure 5, the oil storage hole 9 is connected to the oil storage cavity 6 through the connecting hole 7, and the oil outlet hole 10 is connected to the oil storage hole 9, so that the lubricating oil can be discharged through the connecting hole 7, the oil storage hole 9 and the oil outlet hole 10.

[0028] As attached Figure 1 , 2 As shown, the number of retainers 4 is set to multiple, and a connecting rod 5 is fixedly connected between two retainers 4 to ensure the stability of retainers 4.

[0029] As attached Figure 2 , 4 As shown, a lubricating oil cavity 12 is provided inside the outer ring 2 of the bearing. Multiple oil outlet holes 13 are provided on the inner wall surface of the lubricating oil cavity 12. The multiple oil outlet holes 13 are evenly distributed on the inner wall surface of the outer ring 2 of the bearing, so that the lubricating oil inside the outer ring 2 of the bearing can automatically seep out, further improving the self-lubricating effect.

[0030] As attached Figure 2 , 4 As shown, an oil filling port 14 is provided on the outer surface of the bearing outer ring 2, and a sealing plug 15 is installed inside the oil filling port 14 to facilitate the replenishment of lubricating oil inside the bearing outer ring 2 and improve the service life of the bearing.

[0031] As attached Figure 2-4 As shown, the number of oil outlet pores 10 corresponds one-to-one with the number of oil storage pores 9. The diameter of the oil outlet pores 10 is smaller than that of the oil storage pores 9. By combining the large-pore oil storage pores 9 with the small-pore oil outlet pores 10, a good oil storage effect is achieved, avoiding excessive discharge of lubricating oil.

[0032] As attached Figure 1-4 As shown, both the inner wall surface of the bearing outer ring 2 and the outer wall surface of the bearing inner ring 1 are coated with molybdenum disulfide to further improve the lubrication effect and reduce wear.

[0033] The working principle of this utility model is as follows: The rolling element 3 has an oil storage chamber 6 inside, which is the core space for storing lubricating oil. When the bearing starts to work, the rolling element 3 generates heat and pressure changes as it rolls. The lubricating oil in the oil storage chamber 6 is squeezed and flows through the connecting hole 7 on the inner wall of the oil storage chamber 6 to the oil storage orifice 9. The flow limiting plates 8 on both sides of the connecting hole 7 play a key role in limiting the flow rate of the lubricating oil and ensuring that it enters the oil storage orifice 9 stably and continuously. The oil storage orifice 9 stores a large amount of lubricating oil, which further seeps out to the surface of the rolling element 3 through the oil outlet orifice 10. The grease retainer 11 inside the oil outlet orifice 10 can absorb and slowly release the lubricating oil to prevent it from flowing out quickly. It always maintains an appropriate amount of lubricating oil on the surface of the rolling element 3, reducing the friction and wear when the rolling element 3 contacts the inner ring 1 and the outer ring 2 of the bearing.

[0034] The lubricating oil cavity 12 inside the outer ring 2 of the bearing stores additional lubricating oil. When the bearing is running, the internal pressure and temperature change, and the oil outlet holes 13 evenly distributed on the inner wall of the lubricating oil cavity 12 will release the lubricating oil. Together with the lubricating oil seeping out of the rolling element 3, it will further improve the lubrication effect. When the amount of lubricating oil in the lubricating oil cavity 12 decreases, it can be replenished through the oil replenishment port 14 on the outer surface of the outer ring 2 of the bearing. The sealing plug 15 in the oil replenishment port 14 ensures that the lubricating oil will not leak when not replenishing oil, and external impurities cannot enter.

[0035] Both the inner wall surface of the bearing outer ring 2 and the outer wall surface of the bearing inner ring 1 are coated with molybdenum disulfide. Molybdenum disulfide has a low coefficient of friction and good wear resistance. When the lubricating oil is sufficient, the molybdenum disulfide coating works synergistically with the lubricating oil to reduce the coefficient of friction and reduce wear. When the lubricating oil is insufficient or under special working conditions, the molybdenum disulfide coating can independently play a lubricating role, preventing direct dry friction between the bearing inner ring 1 and the rolling element 3, and between the bearing outer ring 2 and the rolling element 3, ensuring that the bearing can still operate stably under complex working conditions and extending the service life of the bearing.

[0036] In conclusion, the above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A self-lubricating powder metallurgical oil-impregnated bearing comprising a bearing inner ring (1), characterized in that: The bearing inner ring (1) is provided with a bearing outer ring (2) outside, the bearing inner ring (1) and the bearing outer ring (2) are installed with rolling body (3), the rolling body (3) is provided with retainer (4) outside, the rolling body (3) is provided with self-lubricating mechanism inside; The self-lubricating mechanism includes an oil storage cavity (6), the oil storage cavity (6) is opened in the rolling body (3) inside, the oil storage cavity (6) inner wall surface is provided with connecting hole (7), the connecting hole (7) inner wall both sides are fixedly connected with flow limiting plate (8), the rolling body (3) is provided with oil storage aperture (9), the rolling body (3) outer surface is provided with oil outlet aperture (10), the oil outlet aperture (10) is installed with grease retainer (11) inside.

2. The self-lubricating powder metallurgy oil-impregnated bearing according to claim 1, characterized in that: The oil storage aperture (9) and the oil storage cavity (6) are communicated through the connecting hole (7), and the oil outlet aperture (10) and the oil storage aperture (9) are communicated.

3. The self-lubricating powder metallurgy oil-impregnated bearing according to claim 1, characterized in that: The number of the retainer (4) is set to be multiple, and the connecting rod (5) is fixedly connected between the two retainers (4).

4. The self-lubricating powder metallurgy oil-impregnated bearing according to claim 1, characterized in that: The bearing outer ring (2) is provided with a lubricating oil inner cavity (12) inside, and a plurality of oil outlets (13) are formed in the inner wall surface of the lubricating oil inner cavity (12).

5. The self-lubricating powder metallurgy oil-impregnated bearing according to claim 4, characterized in that: Multiple oil outlets (13) are evenly distributed on the inner wall surface of the bearing outer ring (2).

6. The self-lubricating powder metallurgy oiled bearing according to claim 1, characterized in that: The bearing outer ring (2) is provided with a replenishing port (14) on the outer surface, and a sealing plug (15) is installed in the replenishing port (14).

7. The self-lubricating powder metallurgy oiled bearing according to claim 1, characterized in that: The number of the oil outlet aperture (10) corresponds to the number of the oil storage aperture (9), and the aperture of the oil outlet aperture (10) is smaller than the aperture of the oil storage aperture (9).

8. The self-lubricating powder metallurgy oiled bearing according to claim 1, characterized in that: The inner wall surface of the bearing outer ring (2) and the outer wall surface of the bearing inner ring (1) are sprayed with molybdenum disulfide.

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