Self-repairing graphite lubrication bearing

Abstract

The invention relates to the technical field of bearing lubrication, in particular to a self-repairing graphite lubrication bearing suitable for a wind power bearing, the self-repairing graphite lubrication bearing comprises an outer ring and an inner ring, and a self-repairing graphite lubrication rolling body is arranged between the outer ring and the inner ring; the self-repairing graphite lubrication rolling body comprises a rolling body base body and a plurality of self-repairing graphite lubrication devices. A plurality of microphone-shaped lubricating device installation cavities are formed in the surface layer area of the rolling body base body at equal intervals, and each self-repairing graphite lubricating device is coaxially installed in the corresponding microphone-shaped lubricating device installation cavity. The problems that traditional lubricating oil is prone to deterioration at high temperature, poor in low-temperature lubricating effect, high in maintenance cost and the like are solved, and the lubricating oil is suitable for wind power and other severe working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing lubrication, and in particular to a self-repairing graphite lubricating bearing suitable for a wind power bearing, which can realize automatic repair of a lubrication layer under harsh working conditions and reduce maintenance costs. Background Art

[0002] As the core component of mechanical equipment, the lubrication performance of bearings directly affects the service life and operating efficiency of the equipment. At present, there are two main ways to lubricate bearings: 1) Lubricating oil / grease lubrication: using liquid or semi-solid lubricants to reduce friction, but there are problems such as easy oxidation at high temperatures, poor fluidity at low temperatures, and susceptibility to contamination. Regular replacement is required, and the maintenance cost is high; 2) Solid lubrication (such as graphite, molybdenum disulfide): self-lubrication is achieved by pre-coating or embedding solid lubricating materials, but the lubricating layer cannot be automatically repaired after wear, and the lubrication effect decreases after long-term use.

[0003] Wind turbines are key equipment for converting wind energy into electrical energy, and wind turbine bearings play a vital role in this process. Wind turbine bearings are subjected to heavy loads, low speeds, variable operating conditions, and harsh environments (high humidity, salt spray, sand and dust, etc.) for a long time. Traditional lubrication methods face the following challenges:

[0004] 1) Lubricant failure: The oil film is difficult to form stably under extreme temperatures, resulting in boundary lubrication or even dry friction;

[0005] 2) Difficult maintenance: The fan is located at high altitude or in remote areas, the cost of lubricant replacement is high and the downtime loss is large;

[0006] 3) Environmental pollution: Lubricant leakage may pollute soil and water, which is not in line with the development trend of green energy.

[0007] Wind turbine bearings are difficult to manufacture and have high replacement costs. The replacement process requires shutdown, which results in significant economic losses. Therefore, there is an urgent need to develop new bearings with good lubrication effects and the ability to automatically repair the lubrication layer. Summary of the invention

[0008] The present invention aims to overcome the defects of traditional lubrication methods and provide a self-repairing, maintenance-free, long-life graphite lubricated bearing, which is particularly suitable for heavy-load harsh environments such as wind power and mining machinery.

[0009] The technical solution of the present invention to solve the above problems is:

[0010] On the one hand, the present invention provides a self-repairing graphite lubricated bearing, comprising an outer ring and an inner ring, the special features of which are:

[0011] A self-repairing graphite lubricating rolling element is provided between the outer ring and the inner ring; the self-repairing graphite lubricating rolling element comprises a rolling element matrix and a plurality of self-repairing graphite lubricating devices; a plurality of microphone-shaped lubricating device mounting cavities are equidistantly formed in the surface area of the rolling element matrix, and each self-repairing graphite lubricating device is coaxially mounted in the microphone-shaped lubricating device mounting cavity.

[0012] Preferably, the above-mentioned self-repairing graphite lubricating device includes a graphite lubricating ball, a T-shaped concave surface pushing column and a spring; the graphite lubricating ball, the T-shaped concave surface pushing column and the spring are arranged in sequence, the spring is used to provide a pushing force for the T-shaped concave surface pushing column, the T-shaped concave surface pushing column abuts against the graphite lubricating ball, and the graphite lubricating ball is used to roll and apply a graphite lubricating layer during the operation of the bearing.

[0013] Preferably, the above-mentioned microphone-shaped lubricating device mounting cavity includes a circular head cavity and a cylindrical tail cavity; one side of the circular head cavity communicates with the outside, forming a lubricating hole on the surface of the rolling element matrix, and the other side communicates with the cylindrical tail cavity.

[0014] Preferably, the above-mentioned graphite lubricating ball is coaxially assembled in the circular head cavity and is stuck between the lubricating hole and the T-shaped concave surface pushing column;

[0015] One side of the graphite lubricating ball is in direct contact with the concave surface of the T-shaped concave surface pushing column, and the other side is in close fit with the lubricating hole.

[0016] Preferably, the above-mentioned T-shaped concave surface pushing column is coaxially installed in the cylindrical tail cavity;

[0017] The side surface of the T-shaped concave surface pushing column and the inner surface of the cylindrical tail cavity are in transitional fit.

[0018] Preferably, the above-mentioned spring is coaxially nested at the small end of the T-shaped concave surface pushing column; one end of the spring is connected to the T-shaped concave surface pushing column, and the other end abuts against the bottom surface of the cylindrical tail cavity.

[0019] Preferably, there is a gap between the above-mentioned graphite lubricating ball, the T-shaped concave surface pushing column and the circular head cavity and they are not adhered to each other; the graphite lubricating ball can roll freely, and the T-shaped concave surface pushing column can feed axially or rebound freely.

[0020] Preferably, the above-mentioned spring is in a compressed state and always exerts a pushing force on the T-shaped concave surface pushing column to keep the graphite lubricating ball in contact with the inner and outer rings of the bearing.

[0021] Preferably, the above-mentioned lubricating holes are evenly distributed on the surface of the rolling element matrix to ensure that the graphite lubricating layer is evenly applied on the bearing contact surface.

[0022] Preferably, a sealing band is provided between the two ends of the above-mentioned outer ring and inner ring.

[0023] Advantages of the present invention:

[0024] 1) Automatic repair: The propulsion column and spring are set, and the automatic replenishment of the graphite lubricating layer is realized by using the pre-tightening force of the spring, avoiding frequent addition and maintenance, and reducing the operation and maintenance costs; the rolling of the graphite lubricating balls forms a uniform and stable solid graphite lubricating layer on the contact surface, avoiding the disadvantages of uneven coating caused by the large influence of the self-gravity of the liquid lubricating oil;

[0025] 2) Integrated design: The lubricating device is internally provided with rolling elements, without an external feeding system, and the structure is compact;

[0026] 3) Environmental adaptability: Graphite solid lubrication is resistant to high and low temperatures and anti-pollution, and is suitable for extreme working conditions such as wind power, solving the problems of existing lubricating oils being prone to deterioration at high temperatures, poor lubrication effect at low temperatures, poor environmental adaptability (especially in dusty and humid occasions), high costs for regular replacement and maintenance, etc. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of a self-repairing graphite lubricating bearing according to an embodiment of the present invention;

[0028] Figure 2 is a semi-sectional view of a self-repairing graphite lubricating rolling element;

[0029] Figure 3 is an external contour diagram of the rolling element matrix;

[0030] Figure 4 is an internal structure diagram of the rolling element matrix;

[0031] Figure 5 is a schematic structural diagram of a self-repairing graphite lubricating device;

[0032] In the figure:

[0033] 1. Outer ring; 2. Sealing band; 3. Inner ring; 4. Self-repairing graphite lubricating rolling element; 5. Rolling element matrix, 6. Self-repairing graphite lubricating device; 61. Graphite lubricating ball, 62. T-shaped concave propulsion column, 62. Spring; 7. Lubricating micropores; 8. Microphone-shaped lubricating device installation cavity, 81. Circular head cavity, 82. Cylindrical tail cavity. Detailed Embodiments

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0035] Referring to Figures 1-4 , the present invention provides a self-healing graphite lubricating bearing, which includes an outer ring 1 and an inner ring 3. A self-healing graphite lubricating rolling element 4 is arranged between the outer ring 1 and the inner ring 3; the self-healing graphite lubricating rolling element 4 includes a rolling element matrix 5 and a plurality of self-healing graphite lubricating devices 6; a plurality of microphone-shaped lubricating device mounting cavities 8 are equidistantly arranged in the surface area of the rolling element matrix 5, and each self-healing graphite lubricating device 6 is coaxially installed in the microphone-shaped lubricating device mounting cavity 8. By directly installing the graphite self-lubricating device 6 on the rolling element, when the roller rubs against the inner and outer rings, the graphite is automatically and evenly smeared on the contact surface between the two, realizing the automatic addition of the graphite lubricating material, and greatly saving the labor cost of adding and replacing the lubricant.

[0036] Specifically, referring to Figure 5 , the above-mentioned self-healing graphite lubricating device 6 includes a graphite lubricating ball 61, a T-shaped concave surface pushing column 62 and a spring 63; one end of the T-shaped concave surface pushing column 62 has a large diameter, which is the large end, and one end has a small diameter, which is the small end. The end surface of the large end is a concave surface for matching with the spherical surface of the graphite lubricating ball 61, and a step surface is formed between the large end and the small end for clamping the spring 63.

[0037] The graphite lubricating ball 61, the T-shaped concave surface pushing column 62 and the spring 63 are arranged in sequence. The spring 63 is used to provide a thrust to the T-shaped concave surface pushing column 62, and the T-shaped concave surface pushing column 62 presses against the graphite lubricating ball 61. The graphite lubricating ball 61 is used to roll and smear the graphite lubricating layer during the operation of the bearing, realizing the graphite addition function and the graphite automatic replenishment function.

[0038] Specifically, referring to Figure 4 , the above-mentioned microphone-shaped lubricating device mounting cavity 8 includes a circular head cavity 81 and a cylindrical tail cavity 82; one side of the circular head cavity 81 is communicated with the outside, forming a lubricating hole 7 on the surface of the rolling element matrix 5, and the other side is communicated with the cylindrical tail cavity 82, realizing the uniform distribution of the lubricating holes while ensuring the basic structural strength of the rolling element, and greatly improving the effect of graphite lubrication.

[0039] Specifically, referring toFigure 5 , the above-mentioned graphite lubricating ball 61 is assembled in the circular head chamber 81 and is stuck between the lubricating hole 7 and the T-shaped concave surface pushing column 62; one side of the graphite lubricating ball 61 is in direct contact with the concave surface of the T-shaped concave surface pushing column 62, and the other side is always under the thrust of the spring 63 in a compressed state, so that the graphite lubricating ball 61 extends out of the lubricating hole 7, and the graphite lubricating ball 61 maintains contact with the inner and outer rings of the bearing. This ensures good contact between the graphite lubricating ball and the inner and outer rings, and then realizes the uniform application of the graphite lubricating layer.

[0040] The spring with a pre-tightening force can keep the graphite lubricating ball in good contact with the inner and outer rings and optimize the lubrication effect; moreover, when the graphite lubricating layer falls off, the thrust of the spring can force the graphite lubricating ball closer to the inner and outer rings for re-filling.

[0041] Specifically, the above-mentioned T-shaped concave surface pushing column 62 is coaxially installed in the cylindrical tail chamber 82; the side surface of the T-shaped concave surface pushing column 62 has an interference fit with the inner surface of the cylindrical tail chamber 82, which is convenient for the T-shaped concave surface pushing column 62 to move in the cylindrical tail chamber 82, and at the same time prevents graphite powder from falling into the cylindrical tail chamber and blocking the movement space of the spring, hindering the free expansion and contraction of the spring and thus affecting the free replenishment effect.

[0042] Specifically, referring to Figure 5 , the above-mentioned spring 63 is coaxially nested at the small end of the T-shaped concave surface pushing column 62; one end of the spring 63 is connected to the T-shaped concave surface pushing column 62, and the other end abuts against the bottom surface of the cylindrical tail chamber 82. The spring is in a compressed state and can always keep the distance between the graphite lubricating ball and the inner and outer rings within a fixed range, which is not only beneficial to the uniform application of the graphite lubricating layer but also can promote the automatic compensation of the graphite lubricating layer.

[0043] Specifically, referring to Figure 5 , there is a gap between the above-mentioned graphite lubricating ball 61, T-shaped concave surface pushing column 62 and the circular head chamber 81 and they are not adhered to each other; the graphite lubricating ball 61 can roll freely, and the T-shaped concave surface pushing column 62 can freely axially feed or rebound. This structure realizes the free rolling of the graphite lubricating ball and the free axial feeding or rebounding of the T-shaped concave surface pushing column, ensuring the uniform application and automatic repair of the graphite lubricating layer.

[0044] Specifically, referring to Figure 3 , the above-mentioned lubricating holes 7 are evenly distributed on the surface of the rolling element base 5 to ensure that the graphite lubricating layer is evenly applied on the bearing contact surface.

[0045] As a preferred embodiment of the present invention, referring to Figure 1, a sealing strip 2 is provided between the two ends of the outer ring 1 and the inner ring 3. The sealing strip 2 can not only prevent the internal graphite lubricant from leaking out, but also effectively block external pollutants such as dust and water vapor from entering the bearing cavity, significantly improving the reliability of the bearing in harsh environments.

[0046] Specifically, one end of the sealing strip 2 is embedded in the inner wall of the outer ring 1, and the other end abuts against the end face of the inner ring 3. The sealing strip 2 can be made of an elastic material, such as a weather-resistant rubber material.

[0047] See Figure 5 , when the self-repairing graphite lubrication device is working, a small part of the graphite lubricating ball 61 protrudes from the lubrication hole 7. Since the wind power bearing is in a heavy-load and low-speed motion condition, in actual work, the graphite lubricating ball 61 will rotate automatically, and its exposed surface will automatically apply graphite on the outer ring 1 and the inner ring 3 to form a lubricating layer; when the graphite lubricating layer is damaged, the distance between the graphite lubricating ball 61 and the inner and outer rings will become larger, but the pre-tightened spring 63 and the T-shaped concave surface push column 62 will push the graphite lubricating ball 61 close to the inner and outer rings until the damage of the graphite lubricating layer is filled.

[0048] Finally, it should be noted that the above description is only the best implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. For those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-healing graphite lubricating bearing, comprising an outer ring (1) and an inner ring (3), characterized in that: A self-healing graphite lubricating rolling element (4) is provided between the outer ring (1) and the inner ring (3); The self-healing graphite lubricating rolling element (4) comprises a rolling element matrix (5) and a plurality of self-healing graphite lubricating devices (6); A plurality of microphone-shaped lubricating device mounting cavities (8) are equidistantly arranged in the surface area of the rolling element matrix (5), and each self-healing graphite lubricating device (6) is coaxially mounted in the microphone-shaped lubricating device mounting cavity (8).

2. The self-healing graphite lubricating bearing according to claim 1, characterized in that: The self-healing graphite lubricating device (6) comprises a graphite lubricating ball (61), a T-shaped concave surface pushing column (62) and a spring (63); the graphite lubricating ball (61), the T-shaped concave surface pushing column (62) and the spring (63) are arranged in sequence, the spring (63) is used to provide a thrust force to the T-shaped concave surface pushing column (62), the T-shaped concave surface pushing column (62) abuts against the graphite lubricating ball (61), and the graphite lubricating ball (61) is used to roll and apply a graphite lubricating layer during the operation of the bearing.

3. The self-healing graphite lubricating bearing according to claim 2, characterized in that: The microphone-shaped lubricating device mounting cavity (8) comprises a circular head cavity (81) and a cylindrical tail cavity (82); One side of the circular head cavity (81) communicates with the outside, forming a lubricating hole (7) on the surface of the rolling element matrix (5), and the other side communicates with the cylindrical tail cavity (82).

4. The self-healing graphite lubricating bearing according to claim 3, characterized in that: The graphite lubricating ball (61) is assembled in the circular head cavity (81) and is stuck between the lubricating hole (7) and the T-shaped concave surface pushing column (62); One side of the graphite lubricating ball (61) is in direct contact with the concave surface of the T-shaped concave surface pushing column (62), and the other side is in close fit with the lubricating hole (7).

5. The self-healing graphite lubricating bearing according to claim 3, characterized in that: The T-shaped concave surface pushing column (62) is coaxially mounted in the cylindrical tail cavity (82); The side surface of the T-shaped concave surface pushing column (62) has a transition fit with the inner surface of the cylindrical tail cavity (82).

6. The self-healing graphite lubricating bearing according to claim 3, characterized in that: The spring (63) is coaxially nested at the small end of the T-shaped concave surface pushing column (62); One end of the spring (63) is connected to the T-shaped concave surface pushing column (62), and the other end abuts against the bottom surface of the cylindrical tail cavity (82).

7. The self-healing graphite lubricating bearing according to claim 3, characterized in that: There is a gap between the graphite lubricating ball (61), the T-shaped concave surface pushing column (62) and the circular head cavity (81) and they are not adhered to each other; The graphite lubricating ball (61) can roll freely, and the T-shaped concave surface pushing column (62) can axially feed or rebound freely.

8. The self-healing graphite lubricating bearing according to claim 2, characterized in that: The spring (63) is in a compressed state and always applies a thrust to the T-shaped concave surface propulsion column (62), so that the graphite lubricating ball (61) maintains contact with the inner and outer rings of the bearing.

9. The self-repairing graphite lubricating bearing according to claim 1, characterized in that: The lubricating holes (7) are evenly distributed on the surface of the rolling element matrix (5) to ensure that the graphite lubricating layer is evenly applied on the bearing contact surface.

10. The self-repairing graphite lubricating bearing according to any one of claims 1-9, characterized in that: A sealing band (2) is provided between the two ends of the outer ring (1) and the inner ring (3).

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