High load capacity pollution resistant bearing

Abstract

The application discloses a high-bearing-capacity and stain-resistant bearing and relates to the technical field of bearings. The bearing comprises an inner ring, an outer ring, rolling elements arranged between the inner ring and the outer ring, a retainer for holding the rolling elements, and elastic follow-up sealing assemblies symmetrically arranged on both sides of the retainer. Symmetrical sealing grooves are formed in the inner side of the outer ring at both ends in the axial direction, the sealing grooves are open towards the inner ring, and the side of the sealing grooves close to the retainer is a sealing matching surface. The elastic follow-up sealing assembly comprises, from inside to outside, an annular mounting section fixedly assembled at the end of the inner ring, and an annular elastic section connected with the annular mounting section and provided with a counterweight. The elastic follow-up sealing assembly can self-adaptively adjust the contact pressure of the sealing lip petals according to the rotating speed of the bearing, can ensure sealing at low speed and high adhesion, can reduce friction and wear at high speed and centrifugal load reduction, can form an air curtain to block microparticles during rotation, and can stabilize the sealing performance and reduce friction loss under all working conditions, thereby greatly prolonging the service life of the sealing.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, specifically to a high-load-bearing, dirt-resistant bearing. Background Technology

[0002] Rolling bearings, as core components of transmission systems in high-end equipment such as industrial robot bearings, are widely used in harsh operating environments with dust and the risk of solid particle intrusion, including industrial robot joints, automated production lines, and heavy-duty precision transmissions. During high-speed operation and heavy-duty positioning of industrial robots, external dust, metal shavings, and tiny particles can easily penetrate the bearing, causing abnormal wear of the raceways and rolling elements, loss of precision, and operational jamming. This directly affects the positioning accuracy, motion stability, and continuous service life of the industrial robot, becoming a key technical bottleneck restricting the performance improvement of high-end industrial robot bearings.

[0003] In the current manufacturing and application of industrial robot bearings and similar rolling bearings, the sealing structure of traditional sealing and load-bearing structures cannot achieve adaptive speed adjustment. At low speeds, the seal fit is insufficient and dust can easily enter. At high speeds, the sealing lip is subjected to continuous high-pressure friction, resulting in rapid wear, increased temperature, and short seal life. Summary of the Invention

[0004] The purpose of this invention is to provide a high-load-bearing, contamination-resistant bearing to solve the problems mentioned in the background art.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] The present invention provides a high load-bearing capacity and dirt-resistant bearing, comprising an inner ring, an outer ring, rolling elements disposed between the inner ring and the outer ring, a cage for holding the rolling elements, and elastic follower sealing assemblies symmetrically disposed on both sides of the cage; the outer ring has symmetrically formed sealing grooves at both ends of its inner axial direction, the opening of the sealing groove facing the inner ring and the side of the sealing groove near the cage being a sealing mating surface;

[0007] The elastic follow-up sealing assembly, from the inside to the outside, includes an annular mounting section fixedly mounted to the end of the inner ring, an annular elastic section connected to the annular mounting section and equipped with a counterweight, and a sealing lip extending into the sealing groove and contacting the sealing mating surface to form a radial seal; the cross-section of the annular elastic section is arc-shaped and extends radially toward the sealing groove, and the counterweight is disposed on the outer ring edge of the annular elastic section; the annular elastic section has arc-shaped ribs uniformly arranged along the circumferential direction on the side facing outward.

[0008] Furthermore, the cross-section of the sealing groove is a right-angled triangle, with one right-angled side being the radial opening side of the sealing groove facing the inner ring, and the other right-angled side being the axial sidewall of the sealing groove; the hypotenuse of the right-angled triangle is the sealing mating surface of the sealing groove that is close to the retainer and in contact with the sealing lip.

[0009] Furthermore, the elastic follow-up sealing assembly includes an annular flexible skeleton and an elastic sealing lip assembly;

[0010] The annular flexible skeleton includes the integrally formed annular mounting section and the annular elastic section;

[0011] The elastic sealing lip assembly covers the outside of the annular flexible skeleton to form a V-shaped composite sealing structure, which includes a radially outer sealing lip, a U-shaped transition sealing lip, and the sealing lip flap;

[0012] The radially outer sealing lip is closely attached to the radially outer surface of the annular elastic segment and extends continuously in the circumferential direction; one end of the U-shaped transition sealing lip is connected to the outer periphery of the radially outer sealing lip, and the other end of the U-shaped transition sealing lip extends radially inward around the free end of the annular elastic segment; the sealing lip flap is connected to the U-shaped transition sealing lip and extends radially toward the sealing groove of the outer ring, and its free end is in contact with the sealing mating surface.

[0013] Furthermore, the annular elastic segment is uniformly provided with circumferentially penetrating strip grooves along the circumference, dividing it into multiple independent flexible arms; each independent flexible arm is provided with a counterweight at its end, and the cross-sectional dimensions of the independent flexible arm gradually decrease radially outward.

[0014] Furthermore, the resilient sealing lip assembly also includes a circumferential barrier lip disposed in the gap between adjacent independent flexible arms.

[0015] Furthermore, the counterweight is a locally thickened columnar protrusion at the end of the independent flexible arm or an embedded metal counterweight column, and the mass of a single counterweight is 0.5-2g.

[0016] Furthermore, the Shore hardness of the elastic sealing lip assembly is A70-A90; the thickness of the radially outer sealing lip ranges from 0.5mm to 1.5mm; and the free end of the sealing lip flap has a rounded transition of R0.1-R0.5mm.

[0017] Furthermore, the raceways of the inner ring and the outer ring are subjected to carburizing and quenching treatment, with a hardened layer depth of 0.8-1.5 mm, a hardness of HRC60-65, and a surface roughness Ra≤0.4 μm.

[0018] Furthermore, the rolling element is a steel ball or roller, the surface of which is nitrided and has a hardness of HV800-1000; the number of the rolling elements is 10-20.

[0019] Furthermore, the cage is made of nylon or metal, and the clearance between it and the rolling element is 0.1-0.3 mm; the inner sidewall of the cage is provided with elastic scraping wings that are evenly distributed circumferentially, and the ends of the scraping wings lightly touch the surface of the rolling element.

[0020] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0021] 1. The elastic follow-up sealing component of the present invention can adaptively adjust the contact pressure of the sealing lip according to the bearing speed. Low speed and high fit ensure sealing, high speed centrifugal unloading reduces friction and wear, and at the same time, the rotation forms an air curtain to block micro particles. The sealing performance is stable and the friction loss is low under all working conditions, which greatly extends the service life of the seal.

[0022] 2. This invention uses arc-shaped convex ribs to pre-block and throw away large particles, sealing lip for main sealing, and rotating air curtain to block micro particles. Combined with gradient pressure sealing grooves, it forms an outer layer of contamination prevention and an inner layer of buffering, which can effectively block the intrusion path of dust and metal debris and ensure the cleanliness of the bearing interior.

[0023] 3. The inner and outer raceways of this invention are carburized and quenched, and the rolling elements are nitrided and strengthened, resulting in high surface hardness, low roughness, and excellent resistance to fatigue spalling, pitting corrosion, and wear. The cage precisely controls the clearance, ensuring uniform load transfer and significantly improving the bearing's heavy-duty bearing capacity and operational stability.

[0024] 4. The sealing component of this invention adopts a separate and detachable design for the skeleton and sealing lip. The sealing lip can be replaced separately after wear, without the need to disassemble the entire bearing, which simplifies the disassembly and assembly process and reduces the maintenance cost and difficulty of the industrial robot bearing in the later stage.

[0025] 5. The gradient pressure distribution of the sealing groove in this invention ensures that the sealing lip is subjected to continuous and smooth force, effectively preventing cracking and plastic deformation of the sealing lip; the deformation of the annular elastic segment is controllable, and the sealing gap is always kept within a reasonable range, resulting in outstanding sealing stability and structural durability throughout the bearing's entire life cycle.

[0026] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0027] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a top view of the structure of the present invention;

[0030] Figure 3 yes Figure 2 A schematic diagram of the local structure along the AA direction;

[0031] Figure 4 yes Figure 3 Schematic diagram at point A;

[0032] Figure 5 This is a schematic diagram of the disassembled structure of the elastic follow-up sealing component of the present invention;

[0033] Figure 6 This is a schematic diagram of the annular flexible skeleton structure of the present invention;

[0034] Figure 7 This is a schematic diagram of the elastic sealing lip assembly structure of the present invention.

[0035] In the picture:

[0036] 1-Inner ring; 11-Outer ring; 111-Sealing groove; 112-Sealing mating surface; 12-Rolling element; 13-Cage; 2-Elastic follow-up sealing assembly; 21-Arched rib; 22-Annular flexible skeleton; 221-Annular elastic segment; 2211-Counterweight; 2212-Strip groove; 2213-Flexible arm; 222-Annular mounting section; 23-Elastic sealing lip assembly; 231-Sealing lip; 232-Radially outer sealing lip; 233-U-shaped transition sealing lip; 234-Circumferential barrier lip. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0038] Please see Figures 1-7This invention provides a high-load-bearing, contamination-resistant bearing, which is suitable for industrial robot loading drive mechanisms, unidirectional conveying transmission ends, fixed rotating workstations, and harsh working conditions such as automotive manufacturing stamping equipment and 3C electronic unidirectional processing equipment, which are dusty, contain metal debris, and have the risk of solid particle intrusion. While ensuring the bearing's high load-bearing capacity and long service life, it achieves excellent anti-contamination sealing performance through an innovative sealing structure design, effectively preventing external pollutants from entering the bearing. It is especially suitable for industrial transmission scenarios of unidirectional transmission and heavy-load continuous operation of industrial robots.

[0039] This high-load-bearing, dirt-resistant bearing includes an inner ring 1, an outer ring 11, rolling elements 12, a cage 13, and an elastic follower seal assembly. All components work together to meet the bearing's requirements for pressure transmission and dirt prevention sealing. It can be directly applied to high-end equipment such as the core transmission system of industrial robots and the drive end of unidirectional automated conveyor lines.

[0040] The inner ring 1 and outer ring 11, as the core pressure-bearing components of the bearing, are coaxially arranged. The outer circumferential surface of the inner ring 1 and the inner circumferential surface of the outer ring 11 are respectively machined with matching arc-shaped raceways. An annular cavity is formed between the raceways of the inner ring 1 and the outer ring 11, providing space and guidance for the operation of the rolling elements 12. The rolling elements 12 can be steel balls or rollers, assembled in the arc-shaped raceways between the inner ring 1 and the outer ring 11, serving as the main force transmission components of the bearing and undertaking the radial and axial load transmission functions of the equipment. The cage 13 is fitted around the rolling elements 12 to maintain a uniform spacing of the rolling elements 12 in the circumferential direction, preventing direct collision and wear between adjacent rolling elements 12, ensuring smooth operation of the rolling elements 12, and evenly distributing the load.

[0041] The core innovation of this invention lies in the sealing structure design. Elastic follower sealing components are symmetrically arranged on both sides of the cage 13. Corresponding to the assembly position of the elastic follower sealing components, symmetrically fitted sealing grooves 111 are formed at both ends of the inner axial direction of the outer ring 11. The openings of the sealing grooves 111 face the inner ring 1, and the side of the sealing groove 111 closest to the cage 13 is precisely machined into a sealing mating surface 112, providing a fitting sealing reference for the elastic follower sealing components. Through the adaptive mating of the sealing grooves 111 and the elastic follower sealing components, an end sealing barrier is formed on the bearing, blocking the intrusion path of external contaminants.

[0042] Each elastic follow-up sealing assembly includes, from the inside to the outside, an annular mounting section 222, an annular elastic section 221, and a sealing lip 231 in a radial direction. This three-section integrated structure combines installation stability, working condition follow-up, and sealing reliability.

[0043] Among them, the annular mounting section 222 serves as the mounting base for the sealing assembly. It can be fixedly assembled to the end of the inner ring 1 by means of interference fit, bonding or mechanical snap-fit, so that the elastic follow-up sealing assembly and the inner ring 1 form a synchronously rotating whole.

[0044] The annular elastic segment 221 has an arc-shaped cross section and extends radially toward the sealing groove 111 of the outer ring 11. It is made of flexible elastic material and has good elastic deformation and reset capability. The sealing lip 231 extends into the sealing groove 111 and is adapted to contact the sealing mating surface 112 of the sealing groove 111 to form the radial main seal of the bearing.

[0045] The elastic follow-up sealing assembly can adaptively adjust the sealing state according to the bearing's operating speed. When the bearing is stationary or running at low speed, the centrifugal force is small or there is no centrifugal force. Under the elastic force of the annular elastic section 221, the sealing lip 231 is always in close contact with the sealing mating surface 112 of the sealing groove 111, forming a reliable radial seal. This effectively prevents external dust, solid particles and other pollutants from entering the bearing's internal raceway and rolling element 12 area, ensuring clean operation inside the bearing.

[0046] As the bearing speed increases, the centrifugal force on the counterweight 2211 on the annular elastic segment 221, which rotates synchronously with the inner ring 1, increases synchronously. This causes the annular elastic segment 221 to undergo a slight outward radial elastic deformation, which in turn causes the sealing lip 231 to move slightly away from the sealing mating surface 112. This reduces the contact pressure of the sealing lip 231 on the sealing mating surface 112, achieving dynamic adjustment of the sealing contact pressure at different speeds. This effectively controls frictional losses at various speeds, prevents the sealing lip 231 from wearing out rapidly due to high-speed, high-pressure contact, and significantly extends the overall service life of the sealing assembly and the bearing. At the same time, the inner ring 1 drives the elastic follower sealing assembly to rotate at high speed, forming a high-speed rotating air curtain between the sealing lip 231 and the sealing mating surface 112. This air curtain can generate an outward repulsive force against intruding minor external contaminants, effectively compensating for the decrease in sealing performance caused by reduced contact pressure, and ensuring stable sealing performance when the bearing is running at high speed.

[0047] In addition, the annular elastic segment 221 has multiple arc-shaped ribs 21 evenly arranged along the circumference on the side facing outward. The arc-shaped ribs 21 are arranged in a unidirectional arc along the circumference and rotate synchronously with the annular elastic segment 221 at high speed, which can achieve multiple sealing protection effects. On the one hand, it enhances the overall structural strength of the annular elastic segment 221, prevents it from undergoing excessive deformation under centrifugal force, ensures that the displacement of the sealing lip 231 is within a controllable small range, and avoids abnormal increase in the sealing gap. On the other hand, it performs preliminary blocking and centrifugal separation of large dust and solid particles near the sealing area, reduces the accumulation of pollutants at the gap between the sealing lip 231 and the sealing mating surface 112, and reduces the probability of pollutant intrusion. At the same time, the arc-shaped structure can guide the airflow in an orderly manner during rotation, making the airflow in the sealing area more regular, further enhancing the air curtain formation effect, and improving the dynamic fluid sealing barrier's ability to block small particles.

[0048] In this embodiment, the sealing groove 111 has a right-angled triangular cross-section. One right-angled side is a radial opening facing the inner ring 1, and the other right-angled side is an axial sidewall formed on the inner side of the end face of the outer ring 11. The hypotenuse of the right-angled triangle is precision ground to form a low-roughness flat surface, which is the sealing mating surface 112 that matches the end of the sealing lip 231. The two fit together to form a tight radial contact seal. This hypotenuse structure (sealing groove 111) creates a natural pressure gradient distribution. The pressure is greatest at the free end of the sealing lip 231 in contact with the mating surface, and the pressure gradually decreases along the slope from the top corner to the bottom corner, with the pressure dropping to the lowest near the root of the annular elastic segment 221. This gradient distribution concentrates the pressure at the free end of the sealing lip 231, forming a high-pressure sealing front at the outermost radial opening of the sealing groove 111. This effectively resists the intrusion of external dust, solid particles, and mud and water, blocking contaminants at the outermost layer of the sealing contact area. The low-pressure area near the root provides an elastic buffer space for the sealing lip 231, preventing irreversible plastic deformation at the root due to high pressure, ensuring the integrity of the sealing assembly structure, and forming a layered protection system with an outer layer of contamination prevention and an inner layer of buffering.

[0049] When the annular elastic segment 221 undergoes a slight radial outward deformation under centrifugal force, the gradient pressure distribution makes the stress change of the sealing lip 231 more continuous. The high-pressure zone at the free end can maintain the minimum contact pressure required for the basic seal, avoiding seal failure caused by centrifugal force unloading. The low-pressure zone from the middle section to the root can smoothly bear the stress transfer caused by deformation, so that the overall contact pressure decreases smoothly along the inclined surface without local sudden rises or falls, ensuring that the sealing lip 231 always maintains stable surface contact with the mating surface under all operating conditions of speed change, avoiding sealing gaps caused by sudden force changes.

[0050] The pressure distribution characteristics are highly matched with the wear pattern of the sealing lip 231. The free end is the core of the contamination barrier. Although the contact pressure is the highest, the finely ground sealing mating surface 112 can reduce the coefficient of friction. High-pressure bonding can reduce the scratches of contaminant particles on the contact surface. The low-pressure area at the root fundamentally avoids hard friction between the sealing lip 231 and the mating surface, preventing the root from cracking, falling off and other failure problems due to long-term high-pressure extrusion.

[0051] In this embodiment, the elastic follow-up sealing assembly adopts a composite structure, including an annular flexible skeleton 22 and an elastic sealing lip assembly 23 covering its outer side.

[0052] The annular flexible frame 22 can be made of materials such as spring steel to provide structural support and resilience, including an integrally formed annular mounting section 222 and an annular elastic section 221.

[0053] To enhance local flexibility and improve follow-up performance, a circumferentially penetrating strip groove 2212 is uniformly opened along the circumference of the annular elastic segment 221, dividing it into multiple independent flexible arms 2213. The cross-sectional dimensions of each independent flexible arm 2213 gradually decrease radially outward, resulting in better end flexibility. Each independent flexible arm 2213 is equipped with a counterweight 2211 at its end. The counterweight 2211 can be a columnar protrusion formed by local thickening of rubber, or a micro-metal (such as tungsten alloy) counterweight column embedded therein. The mass of a single counterweight 2211 is preferably 0.5-2g. Centrifugal counterweighting ensures that the sealing lip 231 maintains a stable radial outward contact force when the bearing rotates.

[0054] The elastic sealing lip assembly 23 covers the outside of the annular flexible skeleton 22 to form a V-shaped composite sealing structure, specifically including a radial outer sealing lip 232, a U-shaped transition sealing lip 233 and a sealing lip flap 231.

[0055] The radial outer sealing lip 232 is closely attached to the radial outer surface of the annular flexible arm 2213, extends continuously in the circumferential direction, and has a thickness of 0.5 mm to 1.5 mm, serving as an auxiliary seal and skeleton protection layer.

[0056] The U-shaped transition sealing lip 233 connects to the outer periphery of the radially outer sealing lip 232, extends radially inward around the free end of the annular flexible arm 2213, forming a U-shaped cavity and covering the free end of the annular elastic segment 221. The sealing lip 231 connects to the U-shaped transition sealing lip 233, extends radially towards the sealing groove 111, and its free end is machined with a rounded transition of R0.1-R0.5mm to reduce friction and wear. Under the combined action of its own elasticity and the elasticity of the annular flexible skeleton 22, the sealing lip 231 always maintains appropriate contact with the sealing mating surface 112 of the sealing groove 111, forming the main sealing line. In addition, at the gap between adjacent independent flexible arms 2213, the elastic sealing lip assembly 23 is integrally formed with a circumferential barrier lip 234, which can enhance the circumferential limiting effect between the annular flexible skeleton 22 and the elastic sealing lip assembly 23, and prevent the two from undergoing circumferential relative displacement during bearing operation. This split composite structure enables the detachable assembly of the elastic sealing lip assembly 23 and the annular flexible skeleton 22, facilitating the individual replacement of worn sealing lip assemblies without the need to replace the entire sealing structure, thus significantly reducing maintenance costs and disassembly difficulty.

[0057] In this embodiment, the raceway surfaces of the inner ring 1 and the outer ring 11 are carburized and quenched, with the hardened layer depth controlled at 0.8-1.5 mm and the surface hardness reaching HRC60-65. At the same time, the core maintains good toughness, which not only ensures the high load-bearing capacity of the bearing under heavy load conditions, but also improves the fatigue spalling resistance. The surface roughness Ra of the raceway is controlled below 0.4 μm, which can effectively reduce the friction coefficient between the rolling element 12 and the raceway, reduce contact wear, and ensure the smooth operation of the bearing.

[0058] The rolling element 12 can be made of steel balls or rollers, preferably 10-20 in number, which can be flexibly configured according to the load requirements of different working conditions; its surface is nitrided, and the hardness can reach HV800-1000, forming a dense and wear-resistant surface layer, which significantly improves the wear resistance and pitting resistance.

[0059] The cage 13 can be made of high-strength nylon, copper alloy, or steel. The clearance between the cage and the rolling elements 12 is designed to be 0.1-0.3mm, which ensures the free rotation of the rolling elements 12 while effectively limiting their circumferential and radial movement, thus preventing uneven wear on the raceways. In addition, the inner wall of the cage 13 is provided with elastic scraping wings (not shown) evenly distributed circumferentially. The scraping wings are made of rubber or flexible plastic, and their ends lightly touch the surface of the rolling elements 12. When the bearing rotates, the scraping wings rotate synchronously with the cage 13, which can scrape off dust, iron filings, and other contaminants adhering to the surface of the rolling elements 12 in real time, preventing contaminants from being carried into the core area of ​​the raceways, achieving self-cleaning inside the bearing, and further improving the service life and operational reliability of the bearing under harsh working conditions.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-load-bearing, dirt-resistant bearing, comprising an inner ring, an outer ring, rolling elements disposed between the inner ring and the outer ring, and a cage for retaining the rolling elements, characterized in that, It also includes elastic follow-up sealing components symmetrically arranged on both sides of the cage; the inner side of the outer ring is symmetrically provided with sealing grooves at both ends of the axial direction, the opening of the sealing groove faces the inner ring and the side of the sealing groove near the cage is the sealing mating surface; The elastic follow-up sealing assembly, from the inside to the outside, includes an annular mounting section fixedly mounted to the end of the inner ring, an annular elastic section connected to the annular mounting section and equipped with a counterweight, and a sealing lip extending into the sealing groove and contacting the sealing mating surface to form a radial seal; the cross-section of the annular elastic section is arc-shaped and extends radially toward the sealing groove, and the counterweight is disposed on the outer ring edge of the annular elastic section; the annular elastic section has arc-shaped ribs uniformly arranged along the circumferential direction on the side facing outward.

2. The high load-bearing capacity and dirt-resistant bearing according to claim 1, characterized in that, The cross-section of the sealing groove is a right-angled triangle, with one right-angled side being the radial opening side of the sealing groove facing the inner ring, and the other right-angled side being the axial sidewall of the sealing groove; the hypotenuse of the right-angled triangle is the sealing mating surface of the sealing groove that is close to the retainer and in contact with the sealing lip.

3. The high load-bearing capacity and dirt-resistant bearing according to claim 1, characterized in that, The elastic follow-up sealing assembly includes an annular flexible skeleton and an elastic sealing lip assembly; The annular flexible skeleton includes the integrally formed annular mounting section and the annular elastic section; The elastic sealing lip assembly covers the outside of the annular flexible skeleton to form a V-shaped composite sealing structure, which includes a radially outer sealing lip, a U-shaped transition sealing lip, and the sealing lip flap; The radially outer sealing lip is closely attached to the radially outer surface of the annular elastic segment and extends continuously in the circumferential direction; one end of the U-shaped transition sealing lip is connected to the outer periphery of the radially outer sealing lip, and the other end of the U-shaped transition sealing lip extends radially inward around the free end of the annular elastic segment; the sealing lip flap is connected to the U-shaped transition sealing lip and extends radially toward the sealing groove of the outer ring, and its free end is in contact with the sealing mating surface.

4. The high load-bearing capacity and dirt-resistant bearing according to claim 3, characterized in that, The annular elastic segment is uniformly provided with circumferentially penetrating strip grooves along its circumference, dividing it into multiple independent flexible arms; each independent flexible arm is provided with a counterweight at its end, and the cross-sectional dimensions of the independent flexible arm gradually decrease outward along the radial direction.

5. The high load-bearing capacity and dirt-resistant bearing according to claim 4, characterized in that, The resilient sealing lip assembly also includes a circumferential barrier lip disposed in the gap between adjacent independent flexible arms.

6. The high load-bearing capacity and dirt-resistant bearing according to claim 4, characterized in that, The counterweight is a locally thickened columnar protrusion at the end of the independent flexible arm or an embedded metal counterweight column, and the mass of a single counterweight is 0.5-2g.

7. The high load-bearing capacity and dirt-resistant bearing according to claim 4, characterized in that, The elastic sealing lip assembly has a Shore hardness of A70-A90; the thickness of the radially outer sealing lip ranges from 0.5mm to 1.5mm; and the free end of the sealing lip flap has a rounded transition of R0.1-R0.5mm.

8. The high load-bearing capacity and dirt-resistant bearing according to claim 4, characterized in that, The raceways of the inner ring and the outer ring are carburized and quenched, with a hardened layer depth of 0.8-1.5 mm, a hardness of HRC60-65, and a surface roughness Ra≤0.4 μm.

9. The high load-bearing capacity and dirt-resistant bearing according to claim 1, characterized in that, The rolling element is a steel ball with a nitrided surface and a hardness of HV800-1000; the number of rolling elements is 10-20.

10. The high load-bearing capacity and dirt-resistant bearing according to claim 1, characterized in that, The cage is made of nylon or metal, and its fit clearance with the rolling element is 0.1-0.3 mm; the inner sidewall of the cage is provided with elastic scraping wings that are evenly distributed circumferentially, and their ends lightly touch the surface of the rolling element.

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