Design method of self-lubricating texture on inner side surface of sealing ring for rolling bearing

Abstract

The invention discloses a method for designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing, which solves the problem that lubricating grease is adhered to the inner side surface of the sealing ring by arranging a super-oleophobic surface on the inner side surface of the sealing ring. Based on the characteristics of the base oil and observation of the contact angle of oil drops of the base oil in the wedge-shaped texture on the sealing ring, the contact angle outside the wedge-shaped texture and the receding contact angle, the solid-liquid contact boundary length of the oil drops meeting the self-transportation condition of the base oil and the waist line position of the wedge-shaped texture is designed, and therefore the height of the wedge-shaped texture is designed to be larger than the length; a plurality of texture groups which are arranged on the inner side face of the sealing ring at equal intervals in the radial direction can be machined through a femtosecond laser ablation technology, each texture group is composed of a plurality of wedge-shaped textures which are evenly distributed in the circumferential direction, and the tip ends of the wedge-shaped textures face the inner wall of the sealing ring. The wedge-shaped texture can automatically transport base oil separated from lubricating grease in a gap between the inner ring of the rolling bearing and the sealing ring to the outer ring of the rolling bearing, the oil leakage condition between the sealing ring and the inner ring of the bearing is improved, and the sealing performance of the bearing is improved.

Description

Technical Field

[0001] This invention belongs to the field of rolling bearing sealing technology, specifically relating to a self-lubricating texture design method for the inner side of a sealing ring for rolling bearings. Background Technology

[0002] Bearings are indispensable key rotating components in major engineering equipment such as aerospace, nuclear industry, transportation, and tunnel excavation. They are widely used, and their stability directly affects the operating efficiency and lifespan of mechanical components.

[0003] Lubricating media are one of the core elements for ensuring stable bearing operation, reducing friction, and extending bearing life. Grease, with its excellent structure, economic benefits, and sealing performance, is currently the most commonly used lubricating medium in the industrial field. It mainly consists of base oil, thickener, and additives. The base oil is adsorbed within the soap fiber structure of the thickener, thus reducing base oil loss. During bearing operation, due to centrifugal force and roller compression, grease is thrown out or squeezed out of the contact area, and the grease in the raceway gradually decreases. Some of the thrown-out grease adheres to the inner surface of the seal ring. The most common installation method for the seal ring is to fix the outer edge to the outer ring through an interference fit or groove, keeping it relatively stationary, while the inner ring rotates with the shaft. After the grease is squeezed, the base oil easily leaks out from the gap between the inner ring and the seal ring. Therefore, improving the adhesion of grease to the inner surface of the seal ring and achieving self-transportation of oil from the inner ring to the outer ring will effectively improve the sealing performance of the bearing, while reducing friction between the balls and the cage and seal ring, thus improving the lubrication effect of the rolling bearing. Summary of the Invention

[0004] This invention addresses the problems of grease adhesion on the inner surface of the seal ring during long-term operation of rolling bearings and leakage caused by the gap between the seal ring and the inner ring of the bearing. It proposes a self-lubricating texture design method for the inner surface of the seal ring of rolling bearings.

[0005] This invention discloses a self-lubricating texture design method for the inner surface of a rolling bearing seal ring, specifically as follows: A superoleophobic surface is provided on the inner surface of the seal ring, and multiple texture groups are arranged radially at equal intervals. Each texture group consists of multiple wedge-shaped textures evenly distributed circumferentially, with the tips of the wedge-shaped textures facing the inner wall of the seal ring. Given the wedge angle of the wedge-shaped textures, the height of the wedge-shaped textures designed to achieve self-transportation of base oil is as follows:

[0006] The conditions for establishing self-transportation of base oil are as follows:

[0007]

[0008] Limiting the contact angle of oil droplets outside the wedge-shaped texture Minimum value, contact angle of oil droplets within the wedge texture Maximum value, contact angle of oil droplet retreat Minimum value, combined with the surface free energy of the base oil droplet The weight of a single drop of base oil The minimum value of Lsinβ is obtained by taking the value of Lsinβ. Then, based on half of the wedge angle β of the wedge texture, the minimum value of the solid-liquid contact boundary length L between the entire oil droplet and one waist position of the wedge texture is obtained. The height H of the wedge texture is taken as greater than L.

[0009] Preferably, half of the wedge angle β of the wedge texture is 15°, and the depth of the wedge texture is 0.3 mm.

[0010] Preferably, the conditions for achieving self-transportation of base oil are established, and the specific process is as follows:

[0011] Assuming the sealing ring is placed horizontally, the Laplace pressure T at a single contact point of the oil droplet at the wedge-shaped texture is... L The driving force T of the difference in internal and external surface tension q The calculation is as follows:

[0012]

[0013]

[0014] in, It is the contact angle for the oil droplet to advance;

[0015] The Laplace pressure and surface tension difference driving force of the entire oil droplet at the wedge-shaped texture are calculated as follows:

[0016]

[0017]

[0018] Among them, P L It is the Laplace pressure of the entire oil droplet at the wedge-shaped texture, it is The integral of the component force along the X-axis of the wedge-shaped texture with respect to the circular solid-liquid contact boundary DE formed by the advancement of the entire oil droplet. It is an oil droplet at the arc-shaped solid-liquid contact boundary. The angular variable corresponding to the upper length infinitesimal element; P q The driving force is the surface tension difference generated by the contact angle difference between the superoleophilic surface inside the wedge-shaped texture and the superoleophobic surface outside. The integral of the component of force along the X-axis of the wedge texture with respect to the solid-liquid contact boundaries CD and CE at the two waist positions of the oil droplet and the wedge texture. It is a infinitesimal element of length L.

[0019] As the oil droplet advances, it forms an arc-shaped solid-liquid contact boundary within the wedge-shaped texture. The resistance encountered above is:

[0020]

[0021] The resistance experienced by the entire oil droplet as it retreats along the solid-liquid contact boundaries CD and CE at the two waists of the wedge-shaped texture is:

[0022]

[0023] in, It is the arc-shaped solid-liquid contact boundary inside the wedge-shaped texture when the oil droplet advances. The resistance to motion experienced by a length-infinite element , These are the surface free energy of the solid and the surface free energy of the solid-liquid interface, respectively. It is the contact angle of the oil droplet's retreat. It is the motion resistance experienced by the oil droplet on the length elements of the solid-liquid contact boundary CD and CE at the two waist positions of the wedge-shaped texture.

[0024] Total hysteresis P H for:

[0025]

[0026] In actual working conditions, the sealing ring is placed vertically, and the resultant force on the oil droplet at the wedge-shaped texture position along the X-axis of symmetry of the wedge-shaped texture is:

[0027]

[0028] in, The angle between the wedge-shaped texture symmetry axis X and the vertical plane;

[0029] To achieve self-transportation of base oil, a resultant force R > 0 is required; therefore, a system is established. The conditions under which self-transportation of base oil can still be achieved when the maximum value of 1 is taken are as follows:

[0030] .

[0031] Preferably, the oil droplet advances at the arc-shaped solid-liquid contact boundary inside the wedge-shaped texture. The resistance to motion experienced by a infinitesimal element of length The kinetic resistance experienced by the oil droplet on the length elements of the solid-liquid contact boundary CD and CE at the two waist positions of the wedge-shaped texture. The calculation is as follows:

[0032] During the dynamic movement of the oil droplet, its leading edge is affected by resistance as it advances inside the wedge-shaped texture. At this point, Young's equation is:

[0033]

[0034] When the oil droplet retreats at the solid-liquid contact boundaries CD and CE at the two waists of the wedge-shaped texture, it is affected by drag. At this time, Young's equation is:

[0035] .

[0036] Preferably, the processing method for the superoleophobic surface of the inner side of the sealing ring is as follows:

[0037] Nanoparticles with hydroxyl-modified surfaces were added to deionized water, and the nanoparticles and deionized water were mixed using an ultrasonic particle disperser, followed by stirring with a magnetic stirrer to obtain a mixed solution; wherein the mass of the nanoparticles accounted for 1% of the mass of the mixed solution; next, an activator was added to the mixed solution and stirred at room temperature to obtain an aqueous suspension; wherein the mass of the activator accounted for 10% of the mass of the mixed solution; after cleaning the inner surface of the sealing ring with an ultrasonic cleaner, the prepared aqueous suspension was evenly sprayed onto the inner surface of the sealing ring; finally, the sealing ring after being sprayed with the aqueous suspension was placed in a vacuum oven to dry.

[0038] More preferably, the nanoparticles with hydroxyl-modified surfaces are SiO2 or Fe3O4 nanoparticles with hydroxyl groups on their surface.

[0039] More preferably, the active agent is a fluorocarbon surfactant.

[0040] Preferably, the processing method for designing multiple texture groups arranged radially at equal intervals on the inner side of the sealing ring is as follows: multiple texture groups arranged radially at equal intervals are opened on the inner side of the sealing ring using femtosecond laser ablation technology, and then the inner side of the sealing ring is cleaned using an ultrasonic cleaner.

[0041] More preferably, a texture is set on the bottom surface of the wedge-shaped texture, and the specific processing method of the texture is designed as follows: a texture is created on the bottom surface of the wedge-shaped texture using femtosecond laser ablation technology. The texture is a mesh pattern formed by multiple equally spaced grooves and multiple equally spaced or equally angled grooves. The grooves are parallel to the two waistlines of the wedge-shaped texture, or the grooves are parallel to the bottom edge of the wedge-shaped texture and each groove is equally angled around the vertex opposite the bottom edge of the wedge-shaped texture, or the grooves are parallel to the bottom edge of the wedge-shaped texture and the grooves are parallel to the axis of symmetry of the wedge-shaped texture.

[0042] More preferably, when using an ultrasonic cleaner to clean the inner surface of the sealing ring, petroleum ether is used as the cleaning fluid.

[0043] Compared with the prior art, the present invention has the following advantages:

[0044] This invention utilizes modified nanoparticle surface coating technology to regulate wettability on the inner surface of the sealing ring, making it superoleophobic and solving the problem of grease adhesion. Furthermore, this characteristic serves as a key control factor for achieving self-driving grease base oil. Based on the characteristics of the base oil and observations of the contact angles of base oil droplets within, outside, and receding from the wedge-shaped texture on the sealing ring, the solid-liquid contact boundary length between the droplet and the waistline of the wedge-shaped texture is designed to meet the self-transportation conditions of the base oil. This allows for the design of the wedge-shaped... The texture is such that the height of the wedge-shaped texture is greater than the length of the solid-liquid contact boundary. Multiple texture groups arranged radially at equal intervals on the inner side of the sealing ring can be processed by femtosecond laser ablation. The texture group consists of multiple wedge-shaped textures evenly distributed circumferentially, with the tips of the wedge-shaped textures facing the inner wall of the sealing ring. The wedge-shaped textures can self-transport the base oil separated from the grease in the gap between the inner ring of the rolling bearing and the sealing ring to the outer ring of the rolling bearing, thereby improving the oil leakage between the sealing ring and the inner ring of the rolling bearing and enhancing the sealing performance of the rolling bearing. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of a rolling bearing.

[0046] Figure 2 This is a schematic diagram of the sealing ring in this invention.

[0047] Figure 3 This is a schematic diagram showing the angle between the wedge-shaped texture symmetry axis and the vertical plane of the present invention.

[0048] Figure 4 This is a schematic diagram showing the spread and stress of oil droplets at the wedge-shaped texture of the present invention.

[0049] Figure 5 This is a schematic diagram showing the contact angle of oil droplets inside and outside the wedge-shaped texture of the present invention.

[0050] Figure 6 This is a schematic diagram showing the contact angle of an oil droplet advancing through the wedge-shaped texture of the present invention.

[0051] Figure 7 This is a schematic diagram of the wedge-shaped textured bottom surface of the present invention. Detailed Implementation

[0052] The invention will now be further described with reference to the accompanying drawings.

[0053] like Figure 1 As shown, the rolling bearing includes a seal ring 1, an inner ring 2, a cage, balls 3, and an outer ring 4; wherein the balls 3 form a rolling friction pair between the raceways of the inner ring 2 and the outer ring 4; the seal ring 1 is fixed to the outer ring 4 of the bearing by snap-fit ​​or interference fit, and is not fixed to the inner ring 2 during rotation, forming a dynamic seal.

[0054] This invention discloses a self-lubricating texture design method for the inner surface of a rolling bearing seal ring, specifically as follows: A super-oil-repellent surface is provided on the inner surface 6 (the side facing the ball 3) of the seal ring, and multiple texture groups are arranged radially at equal intervals. Each texture group consists of multiple wedge-shaped textures evenly distributed circumferentially, with the tips of the wedge-shaped textures facing the inner wall 5 of the seal ring and the flat ends facing the outer wall 7 of the seal ring. Figure 2 As shown. This invention improves wettability, solves the problem of grease adhesion on the inner side of the sealing ring, and can also self-transport the base oil separated from the grease in the gap between the inner ring of the rolling bearing and the sealing ring to the outer ring of the rolling bearing, thereby improving the sealing performance of the rolling bearing.

[0055] Given the wedge angle of the wedge texture, the wedge texture height designed to achieve self-transportation of base oil is as follows:

[0056] In equilibrium with a uniform surface and no external forces between the solid and the oil droplet, Young's equation is as follows:

[0057]

[0058] in, , , These are the surface free energy of the solid, the surface free energy of the oil droplet, and the surface free energy of the solid-liquid interface. It is the contact angle of an oil droplet on a solid surface.

[0059] When an oil droplet is between two solid surfaces with different contact angles, it will be driven by the unbalanced surface tension to move towards the solid surface with higher surface free energy. Calculated using Young's unbalanced force equation:

[0060]

[0061] Where A is the contact point between the oil droplet and the solid surface with higher surface free energy, and B is the contact point between the oil droplet and the solid surface with lower surface free energy, and dx is the infinitesimal element of the solid-liquid contact line length.

[0062] The traction forces caused by the solid-liquid contact boundary at contact points A and B are:

[0063]

[0064] in, and These are the contact angles at contact points A and B, respectively.

[0065] This invention features a superoleophobic surface outside the wedge-shaped texture, resulting in a large contact angle for oil droplets. Within the wedge-shaped texture (due to the use of femtosecond laser ablation technology), the oil droplets exhibit a relatively small contact angle due to their superoleophilicity. , and It can be obtained by measuring images captured by a high-speed camera, such as Figure 5 As shown; assuming the sealing ring is placed horizontally, the traction force... Includes only Laplace pressure T L The driving force T of the difference in internal and external surface tension q .

[0066]

[0067]

[0068] in, It is the contact angle of the oil droplet's advance, before reaching equilibrium. It is transient and can be measured by capturing images with a high-speed camera, such as... Figure 6 As shown. Figure 5 and Figure 6 The oil droplets are circled in blue.

[0069] like Figure 4 As shown, the Laplace pressure and surface tension difference driving force of the entire oil droplet at the wedge-shaped texture are calculated as follows:

[0070]

[0071]

[0072]

[0073] Among them, P L It is the Laplace pressure of the entire oil droplet at the wedge-shaped texture, it is The integral of the component force along the X-axis of the wedge-shaped texture with respect to the circular solid-liquid contact boundary DE formed by the advancement of the entire oil droplet. It is an oil droplet at the arc-shaped solid-liquid contact boundary. The angular variable corresponding to the upper length infinitesimal element, It is half the wedge angle of the wedge texture; P q The driving force is the surface tension difference generated by the contact angle difference between the superoleophilic surface inside the wedge-shaped texture and the superoleophobic surface outside. The integral of the component of force along the X-axis of the wedge texture with respect to the solid-liquid contact boundaries CD and CE at the two waist positions of the oil droplet and the wedge texture. The integral of the component force along the X-axis of symmetry of the wedge-shaped texture with respect to CE is equal to the integral with respect to CD, then P q It can be expressed as The integral of the component force along the X-axis of the wedge-shaped texture with respect to CD is twice the length of either the solid-liquid contact boundary CD or the solid-liquid contact boundary CE. It is a infinitesimal element of length L.

[0074] During dynamic movement, the oil droplet's leading edge is affected by resistance as it advances within the wedge-shaped texture. Young's equation at this time is:

[0075]

[0076] in, It is the arc-shaped solid-liquid contact boundary inside the wedge-shaped texture when the oil droplet advances. The resistance to motion experienced by a length-infinite element.

[0077] As the oil droplet recedes from the solid-liquid contact boundaries CD and CE at the two waists of the wedge-shaped texture, it will be affected by drag. Young's equation at this point is:

[0078]

[0079] in, It is the contact angle of the oil droplet's retreat. It is the motion resistance experienced by the oil droplet on the length elements of the solid-liquid contact boundary CD and CE at the two waist positions of the wedge-shaped texture.

[0080] As the oil droplet advances, it enters the wedge-shaped texture at the arc-shaped solid-liquid contact boundary. The resistance encountered above is:

[0081]

[0082]

[0083] The resistance experienced by the entire oil droplet as it retreats along the solid-liquid contact boundaries CD and CE at the two waists of the wedge-shaped texture is:

[0084]

[0085] Total hysteresis P H for:

[0086]

[0087] In actual working conditions, the sealing ring is placed vertically, and the resultant force R on the oil droplet at the wedge-shaped texture position along the symmetry axis X of the wedge-shaped texture is caused by the Laplace pressure P. L Surface tension difference driving force P q Total hysteresis force P H When produced by the combined action of gravity G, we have:

[0088]

[0089] (1.13)

[0090] in, Let X be the angle between the wedge-shaped texture's axis of symmetry and the vertical plane, such as... Figure 3 As shown, the value range is (-2π, 2π). To achieve self-transportation of base oil, the resultant force R > 0 is required. Therefore, a system is established... The conditions under which self-transportation of base oil can still be achieved when the maximum value of 1 is taken are as follows:

[0091]

[0092] Considering the contact angle of oil droplets on the superoleophobic surface outside the wedge-shaped texture The contact angle should be greater than 150° on the superoleophilic surface within the wedge-shaped texture. The surface free energy of the base oil droplets should be less than 15°. The weight of a single drop of base oil (The volume of the oil droplets is 0.04–0.05 ml, and the density is generally about 0.9 g / mL. In this example, the weight is taken as follows:) Contact angle of oil droplet retreat The range of the oil droplet movement is 120° to 30°. According to equation (1.14), Lsinβ > 3.45 mm. When β is designed to be 30°, L > 6.9 mm. When β is designed to be 15°, L > 13.33 mm. Therefore, the height H of the wedge texture should be greater than L.

[0093] As a preferred embodiment, the inner surface 6 of the sealing ring is designed to be superoleophobic using modified nanoparticle surface coating technology, as detailed below:

[0094] Nanoparticles with a particle size of less than 50 nm and hydroxyl-modified surface were added to deionized water. The nanoparticles and deionized water were mixed using an ultrasonic particle disperser, and then stirred for 15 minutes using a magnetic stirrer to obtain a mixed solution. The mass of the nanoparticles accounted for 1% of the mass of the mixed solution. Next, an activator was added to the mixed solution and stirred at room temperature for 60 minutes to obtain an aqueous suspension. The mass of the activator accounted for 10% of the mass of the mixed solution. A sealing ring with a deformation of less than 20% was selected. After cleaning the inner surface of the sealing ring with an ultrasonic cleaner, the prepared aqueous suspension was evenly sprayed onto the inner surface of the sealing ring. Finally, the sealing ring after spraying the aqueous suspension was placed in a vacuum oven at 100 °C to dry.

[0095] More preferably, the nanoparticles with hydroxyl-modified surfaces are SiO2 or Fe3O4 nanoparticles with hydroxyl groups on their surface. In SiO2, silicon atoms hydrolyze to generate silanol groups Si-OH, and in Fe3O4, iron ions react with water to generate iron hydroxyl groups Fe-OH.

[0096] More preferably, the surfactant used is a fluorocarbon surfactant.

[0097] As a preferred embodiment, the specific processing method for designing multiple texture groups arranged radially at equal intervals on the inner side of the sealing ring is as follows:

[0098] Multiple texture groups are created radially and equidistantly on the inner side of the sealing ring using femtosecond laser ablation technology. Then, an ultrasonic cleaner is used to clean the inner side of the sealing ring to remove unstable modified nanoparticles and impurities from the surface.

[0099] More preferably, a texture is set on the bottom surface of the wedge-shaped texture, and the specific processing method of the texture is designed as follows: a texture is created on the bottom surface of the wedge-shaped texture using femtosecond laser ablation technology, such as... Figure 7 As shown, the texture is a mesh pattern formed by multiple equally spaced grooves and multiple equally spaced or equally angled grooves. The grooves can be parallel to the two waist lines of the wedge texture, or the grooves can be parallel to the bottom edge of the wedge texture and the grooves can be equally angled around the vertices opposite the bottom edge of the wedge texture. Alternatively, the grooves can be parallel to the bottom edge of the wedge texture and the grooves can be parallel to the axis of symmetry X of the wedge texture.

[0100] More preferably, when using an ultrasonic cleaner to clean the inner surface of the sealing ring, petroleum ether is used as the cleaning fluid.

[0101] More preferably, half of the wedge angle of the wedge texture is designed to be 15°, and the depth is designed to be 0.3 mm.

Claims

1. A design method of a self-lubricating texture on an inner side surface of a sealing ring for a rolling bearing, characterized by: An ultra-oleophobic surface is arranged on the inner side of the sealing ring, and a plurality of texture groups are arranged equidistantly in the radial direction, each of the texture groups is composed of a plurality of wedge textures uniformly distributed in the circumferential direction, and the tip of each wedge texture faces the inner wall of the sealing ring; wherein, given the wedge angle of the wedge texture, the height of the wedge texture for realizing self-transport of base oil is as follows: The condition for realizing self-transport of base oil is established as follows: Minimum value of contact angle of oil droplet outside wedge texture Minimum value of contact angle of oil droplet inside wedge texture Maximum value of contact angle of oil droplet retraction Minimum value of surface free energy of base oil droplet And the weight of a drop of base oil droplet The minimum value of Lsinβ is obtained, and then according to half of the wedge angle β of the wedge texture, the solid-liquid contact boundary length L of the entire oil droplet and one waist position of the wedge texture is obtained.

2. The method of designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing according to claim 1, characterized in that: Half of the wedge angle of the wedge texture is β = 15°, and the depth of the wedge texture is 0.3 mm.

3. The method of designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing according to claim 1, characterized in that: The condition for realizing self-transport of base oil is established, and the specific process is as follows: Assuming the seal ring is placed horizontally, the Laplace pressure T of the oil droplet at the single contact point of the wedge texture L and the driving force of the difference in surface tension between the inner and outer surfaces T q is calculated as follows: wherein is the contact angle of the oil droplet advancement; The Laplace pressure difference driving force of the whole oil droplet at the wedge texture is calculated as follows: wherein P L is the Laplace pressure of the whole oil droplet at the wedge texture, is is the integral of the component of the force in the direction of the symmetry axis X of the wedge texture on the circular arc solid-liquid contact boundary DE formed by the advance of the whole oil droplet, is the angular variable corresponding to the length element of the circular arc solid-liquid contact boundary DE of the oil droplet, P is the driving force of the surface tension difference generated by the difference in the contact angle between the super-oleophilic surface inside the wedge texture and the super-oleophobic surface outside the wedge texture, is q is the integral of the component of the force in the direction of the symmetry axis X of the wedge texture on the circular arc solid-liquid contact boundary DE formed by the advance of the whole oil droplet, is the integral of the component of the force in the direction of the symmetry axis X of the wedge texture on the circular arc solid-liquid contact boundary DE formed by the advance of the whole oil droplet, is the length element of L. The entire oil droplet advances while the solid-liquid contact boundary is a circular arc inside the wedge-shaped texture The resistance experienced by the upper is: The resistance of the whole oil droplet retreating on the solid-liquid contact boundary CD and CE of the two waist positions of the wedge texture is: wherein is the length of the infinitesimal of the solid-liquid contact boundary CD or CE of the oil droplet at the two waist positions of the wedge texture, is the motion resistance of the oil droplet on the infinitesimal of the solid-liquid contact boundary CD or CE of the oil droplet at the two waist positions of the wedge texture, , are the surface free energy of the solid and the solid-liquid contact boundary, respectively, is the contact angle of the oil droplet in the process of retreating, is the motion resistance of the oil droplet on the infinitesimal of the solid-liquid contact boundary CD or CE of the oil droplet at the two waist positions of the wedge texture. Total hysteretic force P H is: In actual working conditions, the sealing ring is placed vertically, and the resultant force of the oil droplet at the wedge texture position in the direction of the wedge texture symmetry axis X is: wherein is the angle between the wedge texture symmetry axis X and the vertical plane; To realize the self-transportation of base oil, the resultant force R > 0 is needed, and the following equation is established The conditions for realizing the self-transportation of base oil when the maximum value 1 is taken are as follows: 。 4. The method of designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing according to claim 3, characterized in that: The length of the arc of the circle solid-liquid contact boundary inside the wedge texture through which the oil droplet advances The length of the arc of the circle solid-liquid contact boundary inside the wedge texture through which the oil droplet advances The length of the arc of the circle solid-liquid contact boundary inside the wedge texture through which the oil droplet advances The length of the arc of the circle solid-liquid contact boundary inside the wedge texture through which the oil droplet advances During the dynamic movement of the oil droplet, the front edge is affected by the resistance when advancing in the wedge texture, and the Young equation at this time is: When the oil droplet retreats on the solid-liquid contact boundary CD and CE of the two waist positions of the wedge texture, the resistance is affected, and the Young equation at this time is: 。 5. The method of designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing according to claim 1, characterized in that: The processing method of the ultra-oleophobic surface on the inner side of the sealing ring is as follows: The surface of the hydroxyl-modified nanoparticles is added to deionized water, the nanoparticles and deionized water are mixed using an ultrasonic particle disperser, and then a magnetic stirrer is used for stirring to obtain a mixed solution; wherein, the mass of the nanoparticles accounts for 1% of the mass of the mixed solution; then, an active agent is added to the mixed solution, and stirring is carried out at room temperature to prepare an aqueous suspension; wherein, the mass of the active agent accounts for 10% of the mass of the mixed solution; after cleaning the inner side of the sealing ring using an ultrasonic cleaner, the prepared aqueous suspension is uniformly sprayed onto the inner side of the sealing ring; finally, the sealing ring after spraying the aqueous suspension is placed in a vacuum oven for drying.

6. The method of designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing according to claim 5, characterized in that: The surface of the hydroxyl-modified nanoparticles uses SiO2 or Fe3O4 surface self-hydroxyl nanoparticles.

7. The method of designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing according to claim 5, characterized in that: The active agent uses a fluorocarbon surfactant.

8. The method of designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing according to claim 1, characterized in that: The processing method of the plurality of texture groups arranged equidistantly in the radial direction on the inner side of the sealing ring is as follows: a femtosecond laser ablation technology is used to open a plurality of texture groups arranged equidistantly in the radial direction on the inner side of the sealing ring, and then an ultrasonic cleaner is used to clean the inner side of the sealing ring.

9. The method of designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing according to claim 1 or 8, characterized in that: The texture is arranged on the bottom surface of the wedge texture, and the processing method of the texture is as follows: a femtosecond laser ablation technology is used to open a texture on the bottom surface of the wedge texture, the texture is a mesh pattern formed by a plurality of channels one and a plurality of channels two distributed equidistantly or at equal angles, the channels one and the channels two are parallel to the two waist lines of the wedge texture, or the channels one are parallel to the bottom edge of the wedge texture, and each of the channels two is distributed at equal angles around the vertex opposite to the bottom edge of the wedge texture, or the channels one are parallel to the bottom edge of the wedge texture, and the channels two are parallel to the symmetry axis of the wedge texture.

10. The method of designing a self-lubricating texture on the inner side surface of a sealing ring for a rolling bearing according to claim 5 or 8, characterized in that: When the inner side of the sealing ring is cleaned using an ultrasonic cleaner, petroleum ether is used as the cleaning liquid.

Images