Catalog Download: Self-Lubricating Bearing Solutions for All Industries In today’s competitive industrial landscape, efficiency, reliability, and performance are non-negotiable. Industries ranging from automotive to heavy machinery require components that can withstand extreme conditions, and one of the most vital yet often overlooked components is the bearing. For applications requiring long-lasting performance with minimal maintenance, self-lubricating bearings stand out. This article will delve into the benefits of self-lubricating bearings, explain the different types available, and why they’re a must-have for industries worldwide.   Download the Catalog Here: Download VIIPLUS Catalog for Self-Lubricating Bearings     Why Choose Self-Lubricating Bearings?   Traditional bearings often require external lubrication to function effectively. However, this introduces several challenges, such as the need for regular maintenance, the possibility of lubrication contamination, and increased downtime. Self-lubricating bearings, on the other hand, are designed to provide constant lubrication without the need for additional maintenance. These bearings incorporate solid or embedded lubricants that ensure smooth movement even under heavy loads and high-speed conditions. Key Benefits: Reduced Maintenance: Self-lubricating bearings reduce the need for routine lubrication, saving time and operational costs. Increased Longevity: With embedded lubrication, these bearings have a longer service life, even under harsh operating conditions. Lower Environmental Impact: They reduce the need for external lubricants, which can often be harmful to the environment. Improved Efficiency: These bearings help in maintaining consistent performance by reducing friction and wear over time. Types of Self-Lubricating Bearings When it comes to self-lubricating bearings, there is no one-size-fits-all solution. The choice of material and design depends on the specific requirements of the application, such as load capacity, speed, and environmental conditions. Below is an in-depth look at the most common types of self-lubricating bearings available in the market: 1. Carbon Steel Self-Lubricating Bushes Material Composition: Carbon Steel with embedded lubricants Applications: Automotive, construction machinery, and agricultural equipment Advantages: Excellent load-bearing capacity Cost-effective for high-volume applications Suitable for moderate speeds and medium to high loads Limitations: May not be ideal for extreme temperature or corrosive environments 2. Bronze Pb-Free Self-Lubricating Bushes Material Composition: Lead-free bronze with self-lubricating compounds Applications: Marine, food processing, and medical industries Advantages: High corrosion resistance Safe for environments requiring lead-free materials Long service life under high loads and speeds Limitations: Can be more expensive compared to traditional bronze bearings 3. Marginal Pb-Free Self-Lubricating Bushes Material Composition: Marginal lead-free bronze alloys Applications: Industrial machinery, railways, and energy sectors Advantages: Suitable for applications where slight wear is acceptable Economical choice for moderate load conditions Environmentally friendly Limitations: Not ideal for high-speed or high-load conditions 4. Bronze-Wrapped Bushes Material Composition: Bronze wrapped around a steel backing Applications: Heavy machinery, automotive, and mining equipment Advantages: High durability under shock and vibration Ideal for harsh working conditions Combines the strength of steel with the wear-resistance of bronze Limitations: Prone to wear in environments where contaminants are present 5. Bimetallic Self-Lubricating Bushes Material Composition: Two metals, typically steel and bronze, combined to offer enhanced performance Applications: High-performance applications such as turbines, compressors, and pumps Advantages: Combines the strength of steel with the corrosion resistance of bronze Excellent in high-speed and high-load applications Low friction and wear Limitations: More expensive than single-material bearings 6. Solid-Lubricant Bushes Material Composition: Solid lubricants embedded within the bearing material Applications: Aerospace, automotive, and machinery that operates in extreme conditions Advantages: Can operate without external lubricants Ideal for extreme temperatures, pressures, and speeds Very low friction and wear Limitations: Can be costly depending on the lubricant used Limited by the specific conditions in which they can be used Key Industries That Benefit from Self-Lubricating Bearings Self-lubricating bearings are indispensable across a wide range of industries due to their ability to reduce maintenance costs and improve operational efficiency. Below is a table outlining the major industries that rely on self-lubricating bearings: Industry Common Applications Benefits Automotive Wheel hubs, suspension systems, and engine components Reduced wear, higher load capacity Marine Ship rudders, stern tubes, and propellers Corrosion resistance, long lifespan Mining and Construction Excavators, cranes, and drilling rigs Durability under harsh conditions Food & Beverage Conveyor systems, mixers, and production equipment Compliance with hygiene standards Energy Wind turbines, turbines, and pumps Low maintenance, high load capacity Choosing the Right Self-Lubricating Bearing for Your Application The process of selecting the right self-lubricating bearing for your application involves considering multiple factors such as: Load capacity: Will the bearing be subjected to heavy loads or light pressure? Speed: Is the bearing used in a high-speed or low-speed application? Environmental factors: Is the bearing exposed to high temperatures, moisture, or chemicals? Maintenance needs: Does your application require minimal upkeep? By downloading the VIIPLUS Bearing Catalog, you gain access to a variety of self-lubricating bearings tailored to meet the demands of your specific industry. Whether you need carbon steel, bronze-wrapped, or bimetallic bearings, the catalog provides detailed specifications and performance data to help you make an informed decision. Conclusion Self-lubricating bearings represent a smart choice for industries that require high-performance, low-maintenance solutions. By understanding the different types of self-lubricating bearings and their applications, businesses can make better-informed decisions that lead to increased efficiency and reduced operational costs. Download the VIIPLUS catalog today to explore the complete range of self-lubricating bearing products available for all industries.  

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Technical parameters of self-lubricating bearings   The meaning of self-lubricating bearings The term "non-lubrication" refers to the absence or lack of external lubrication. Our research aims to ensure that bearings maintain optimal performance under various operating conditions while maximizing their service life. The fundamental operating principle of a self-lubricating bearing is that, during the initial stages of operation, the solid lubricant on the bearing’s surface forms a transfer film through friction. This film coats the interacting parts, eventually creating a solid lubricating layer. This layer serves to isolate direct contact between the workpieces, effectively protecting the grinding components and extending the service life of both the bearing and the workpiece. PV Value Calculation for Bearings - Definition ○ Load pressure P: defined as the load divided by the positive projection area of the bearing bearing surface (unit: N/mm²); ○ Running speed V: defined as the relative linear velocity on the dual surface (unit: m/s); ○ PV value: defined as the product of bearing pressure P and velocity V (unit: N/mm · m/s); ○ Allowable maximum PV value: Allowable maximum pressure P× allowable maximum speed V (unit: N/mm²·m/s).   Calculation of the PV value of the bearing - the maximum allowable PV value ○ When the PV value reaches the limit value, the bearing can be operated for a short time. In continuous operation, the choice of the maximum allowable PV value depends on the requirements of the operating life. Design requirements: maximum allowable PV value, allowable maximum pressure P* allowable maximum speed V. See the image below:   The design of the matching housing bore - straight sleeve bearing In order to facilitate bearing mounting, the mating housing bore must be chamfered. 1) Straight sleeve bearing ○ The matching seat hole should be chamfered fG×20o ±5o, and the size of fG should be based on the diameter of the seat hole dH.   Matching housing bore design - flange bearing In order to facilitate bearing mounting, the mating housing bore must be chamfered. 2) Flange bearings ○ For flanged bearing mating housing holes, the housing bore is required to provide a chamfer large enough to prevent deformation at the flanging radius of the flanging bearing. Matching seat hole chamfer fG×45o ±5°   The design of the matching shaft ○ The performance of self-lubricating bearings is largely affected by the surface roughness, hardness and surface plating of the mating shaft material, and the high-quality mating shaft surface can prolong the life of the bearing, on the contrary, the rough mating shaft surface will reduce the life of the bearing.   Design of mating shaft - surface roughness of mating shaft ○ a) When the surface roughness of the mating shaft is large, the convex part of the shaft and the bearing will cut off the oil film, resulting in direct contact between the two, so the surface of the mating shaft is required to be mirror-processed, so as to reduce the oil film gap as much as possible, so that it is close to the state of fluid lubrication, so that the bearing performance can be improved. ○ b) Most self-lubricating bearings are used under dry friction or boundary lubrication conditions, and do not need to require mirror processing on the surface of the mating shaft as under fluid lubrication conditions, as long as the surface roughness of the mating shaft is controlled in the range of Ra=0.32~1.25.   Design of mating shaft - mating shaft hardness ○ When there is no intrusion of hard impurities, good results can be obtained by using the shaft material and hardness recommended in the table below; Instead, use a mating shaft material with a higher degree of hardness whenever possible. ○ Under the condition of high load and swinging movement, the matching shaft must be heat-treated, and the hardness after heat treatment is inferred according to the material.   Design of mating shaft - surface treatment of mating shaft The purpose of mating shaft surface treatment is to: a) Improved corrosion resistance b) Improve surface hardness c) Smooth the surface and improve lubricity. c) Plating on the mating shaft can improve its corrosion resistance, and effectively reduce rough friction and improve lubricity; When the mating shaft is rusted, the invading of hard oxides and foreign matter is also one of the causes of wear, so it is recommended that users plating hard chrome on the mating shaft. Under similar corrosive conditions, such as seawater, mating shafts must be plated with two to three layers of hard chrome.   Design of mating shafts - Mechanism design of mating shafts ○ The rough surface of the mating shaft, sharp corner burrs, and grooves will damage the sliding layer, as shown in the figure below:   The same factor that affects the life of the bearing ○ The life of self-lubricating bearings, except for intense scorching, is usually determined by the wear of the inner diameter of the bearing. Self-lubricating bearings are used in dry friction, boundary lubrication, and fluid lubrication, and their wear conditions vary greatly. The main factors that determine the life of self-lubricating bearings are: load characteristics and direction, lubrication conditions, operating speed, ambient temperature, mating shaft hardness, mating surface roughness, mating shaft material, the properties of the surrounding air (gas), etc., so it is very difficult to find the exact wear amount through calculation. ○ Without considering the influence of speed and load on the bearing, the difference in the direction of movement of the bearing, the type of lubrication, the size of the mating clearance, the surface roughness and the --- of the magazine penetration, etc., the empirical formula for calculating the wear amount W can be given: ○ W=K· P· V· T (mm) ○ P: Load pressure (N/mm²) ○ V: Running velocity(m/s); ○ K: Abrasion coefficient (mm/ (N/mm² · m/s · hr)) ○ T: Running time (hr) ○ Under different lubrication conditions, the value of the wear coefficient K obtained by the experiment is shown in the following table: Assembly of bearings - Formula for calculating the press-fit force F during assembly ○ t: Basic thickness (mm) after removing the composite layer ○ b: Bearing height (mm) △: Stress coefficient = 1.9×105 (N/mm²) B ○ бmax: interference (mm) ○ D: Bearing OD (mm) ○ : At this time, the friction coefficient between the outer circle of the bearing and the inner circle of the housing bore is usually about 0.15. ○ Examples: ○ PTFE BUSHING 2015 (standard product) Press into the seat hole of φ23, and find the amount of press-in force F at this time.   ○ Calculation: ○ The thickness of the wall is SB=1.5mm, the thickness of the composite layer is 0.3mm, and the thickness of the substrate is t=1.5-0.3=1.2mm; Bearing height b=15;Bearing outer diameter D=23mm; Interference бmin=0.014mm, interference бmax=0.075mm. ○ Therefore, the press-in force F=1880~10040N during installation   Bearing assembly - sleeve assembly method Assembly method 1) Assembling method of straight bearings ○ The diameter of the mandrel guide rod is 0.1~0.3mm smaller than the diameter of the mounted bearing. The mandrel is best heat-treated. In order to facilitate press-fitting, a little oil can be drawn on the outer diameter surface of the bearing, and do not press it in by impact methods such as directly hitting the end face of the bushing with a hammer; When installing large diameter D>55mm bearings, measures must be taken to calibrate the bearing seams. Bearing assembly-flanging assembly method In order to facilitate bearing mounting, the mating housing bore must be chamfered. 2) Flange bearings ○ For flanged bearing mating housing holes, the housing bore is required to provide a chamfer large enough to prevent deformation at the flanging radius of the flanging bearing. Matching seat hole chamfer fG×45o ±5°   Bearing assembly - thrust gasket, plate assembly method Assembly method 3) The assembly method of thrust gasket and flat plate ○ We recommend the use of fixed pins, countersunk nails to install thrust gaskets, and the use of inlaid mounting plates. When installing thrust gaskets or plates, the lubrication layer is required to be 0.3~0.5mm thick higher than the base.   Inspection method of rolled bearing - inspection method of outer diameter of wrapped bearing 1. Inspection method for the outer diameter of the rolled bearing 1) Pressurized test method (according to DIN1494-2 test method A) ○ The test tire is composed of two semi-circular test dies, during the inspection, the zero position is calibrated with the calibration mandrel dch.2, the slit of the bearing is placed on the top of the test die, and then the two halves of the die are applied to each other to the test load Fch, and the distance △z of the test die is obtained by the reading device. 2) Environmental gauge test method (according to DIN 1494-2 test method B) ○ The inspection adopts the through and stop ring gauge for testing, and the bearing can be pushed in and passed by hand (maximum force 250N); Under the same force, the ring gauge cannot be entered. Note: In some cases, e.g. if the wrapped bearing is not round or the seam is too large, the inspection accuracy may be affected. 3) Ruler detection method (according to ISO3547-2 test method D) ○ In order to measure the outer diameter of a large bearing, the circumference of the circle can be measured with a ruler. Use a measuring tape ruler 360° along the midline of the bearing width along the bearing to apply sufficient tension to close the opening. The measuring tape ruler is calibrated around the locating mandrel whose outer diameter is equal to the nominal outer diameter of the bearing. The indicator is placed at the free end of the measuring tape and adjusted to the calibrated size. After the bearing inspection is completed, the circumference indicator reading △ZD should be the difference between the measured value of the bearing and the calibration value of the positioning mandrel. From this, the outer diameter of the bearing can be calculated. Inspection method of rolled bearing - inspection method of inner diameter of wrapped bearing 2. Inspection method for the inner diameter of the rolled bearing 1) Plug gauge test method (according to DIN 1494-2 test method C) ○ Press the wrapped bearing into the H7 median ring gauge, and use the plug gauge to detect the inner diameter of the bearing. 2) Micrometer detection method for wall thickness ○ Use a wall thickness micrometer to measure the wall thickness of the bearing to indirectly calculate the inner diameter of the bearing. Note: According to DIN1494-2, it is important to remember that the wall thickness and bore diameter of the test bearing cannot be marked on the drawing at the same time. Inspection method of rolled bearing - inspection method of thrust plate 2. Inspection method for the inner diameter of the rolled bearing 1) Plug gauge test method (according to DIN 1494-2 test method C) ○ Press the wrapped bearing into the H7 median ring gauge, and use the plug gauge to detect the inner diameter of the bearing. 2) Micrometer detection method for wall thickness ○ Use a wall thickness micrometer to measure the wall thickness of the bearing to indirectly calculate the inner diameter of the bearing. Note: According to DIN1494-2, it is important to remember that the wall thickness and bore diameter of the test bearing cannot be marked on the drawing at the same time. Surface roughness comparison table          

Types and Broad Applications of Advanced Self-Lubricating Bearings To meet the demands of diverse operating conditions, the market offers various types of advanced self-lubricating and maintenance-free bearing solutions. Currently, the primary types that are technologically mature and widely used include: Metal-Plastic Composite Bearings: Typically constructed with a metal backing (e.g., steel or bronze), a sintered porous bronze interlayer, and a surface layer impregnated with self-lubricating materials such as PTFE. These offer excellent low friction and wear resistance properties. Cast Bronze Bearings: Utilizing a base of high-strength brass or tin bronze, these bearings achieve self-lubrication through embedded solid lubricants (like graphite or MoS₂) or by leveraging the inherent properties of special alloys. They are well-suited for high-load, low-speed applications. Rolled Bronze Bearings: Formed by rolling specially formulated bronze alloy sheets. Their surface can feature indentations (oil pockets) or through-holes for grease retention, making them suitable for applications requiring supplemental grease or operating under boundary lubrication conditions. Solid lubricants can also be embedded. Bi-metal Bearings: These feature a steel backing onto which a layer of wear-resistant bearing alloy (such as copper-lead or aluminum-tin alloys) is sintered. This combines the strength of steel with the anti-friction properties of the bearing alloy, commonly used for moderate to high loads and speeds.   Professional manufacturers typically adhere strictly to international or industry standards (e.g., ISO, DIN) during production, ensuring consistent product quality and performance stability. Furthermore, to meet specific equipment design requirements, many manufacturers offer custom manufacturing services based on client drawings or detailed specifications. The application scope for these high-performance bearings is extremely broad, extending far beyond the heavy construction machinery like excavators and bulldozers discussed earlier. They play an indispensable role in a multitude of industrial sectors, including: Transportation: Vehicles (chassis, suspension systems, steering systems, etc.) Manufacturing & Processing: Machine tools, molds, injection molding machines, rubber machinery, forging equipment, rolling mills Heavy Industry: Metallurgical machinery, mining machinery, lifting equipment, port and marine machinery General & Specialized Machinery: Textile machinery, construction machinery (other types), printing machinery, agricultural/forestry/water conservancy machinery, chemical machinery, food machinery Automation & Equipment: Automation equipment, fitness equipment, etc.   Whether dealing with critical, high-load pivot points in construction machinery, precision movements in automated equipment, or harsh environments in mining and metallurgical machinery, selecting the appropriate self-lubricating or maintenance-free bearing significantly enhances operational reliability, reduces maintenance costs, extends service life, and contributes to cleaner, more efficient operations.  

The Hidden Game-Changer in Heavy Machinery: Solid-Lubricating & Maintenance-Free Sliding Bearings Explained In the rugged world of engineering machinery—think excavators, bulldozers, and cranes—the reliability of components like sliding bearings can make or break productivity. Traditional grease-lubricated bearings often falter under extreme loads, contamination, or harsh environments. This is where solid-lubricating and maintenance-free sliding bearings step in as a revolutionary solution. But what makes them so unique? Let’s dive into their design, material science, and real-world applications with actionable insights. Material Breakdown: The Science Behind Self-Lubrication Self-lubricating bearings eliminate the need for external grease by embedding solid lubricants (e.g., PTFE, graphite, or molybdenum disulfide) into their matrix. Here’s how the three primary types used in engineering machinery compare: Bearing Type Structure Lubrication Mechanism Max Load (MPa) Temp Range (°C) Key Applications Bimetal Boundary Lubrication Steel backing + porous bronze + PTFE/Pb layer PTFE/Pb layer releases lubricant under friction 140 -200 to +280 Chassis systems, pivot joints Metal-Based Self-Lubricating Sintered metal (Cu/Fe) + solid lubricants Lubricants embedded in pores release gradually 250 -100 to +300 Hydraulic cylinders, heavy gears Metal-Plastic Composite Steel + PTFE/fiber-reinforced polymer PTFE creates low-friction film 60 -50 to +250 Light-duty linkages, bushings Why This Matters: Bimetal bearings excel in high-load, low-speed applications (e.g., excavator track rollers). Metal-based sintered bearings handle extreme pressures in hydraulic pumps. Metal-plastic composites reduce noise in cab mounts or suspension systems. Application Case Studies: Where They Shine 1. Chassis & Undercarriage Systems In crawler excavators, bimetal bearings are critical for track links and idlers. Traditional bearings fail rapidly due to dirt ingress, but self-lubricating versions use PTFE’s anti-dust embedding property to maintain performance. Result: 3x longer service life in abrasive environments. 2. Hydraulic Components Hydraulic cylinders in bulldozers face pulsating loads up to 250 MPa. Sintered metal bearings with MoS2 coatings reduce stick-slip motion, ensuring smooth piston movement even under shock loads. 3. Body & Cab Components Metal-plastic bearings in crane cab mounts dampen vibrations. Their dry-running capability eliminates grease contamination risks in operator cabins. Traditional vs. Self-Lubricating Bearings: A Cost-Benefit Face-Off Factor Traditional Greased Bearings Solid-Lubricating Bearings Maintenance Frequency Every 500–1,000 hours None (lifelong lubrication) Downtime Cost High (labor + lost productivity) Zero Environmental Impact Risk of grease leakage (soil contamination) Eco-friendly (no lubricant discharge) Initial Cost Lower 20–30% higher Lifespan 6–12 months (harsh conditions) 2–5 years (same conditions) Takeaway: While self-lubricating bearings have a higher upfront cost, they reduce total ownership costs by 40–60% over 5 years (see chart below). ![Cost Comparison Chart] (Hypothetical chart idea: A bar graph showing cumulative costs of traditional vs. self-lubricating bearings over 5 years, with maintenance, downtime, and replacement costs stacked.) Critical Design Considerations for Engineers Load-Speed Matrix: Use bimetal bearings for low-speed, high-load (e.g., < 1 m/s, > 100 MPa). Metal-plastic suits moderate loads with higher speeds (e.g., conveyor rollers). Temperature Limits: PTFE degrades above 280°C—opt for graphite-based lubricants in high-heat zones like engine mounts. Corrosion Resistance: Stainless steel-backed bearings are mandatory in offshore or chemical-exposed machinery. The Future: Smart Maintenance-Free Bearings Emerging trends include:https://www.viiiplus.com Embedded sensors: IoT-enabled bearings that monitor wear in real time. Hybrid materials: Graphene-enhanced polymers for ultra-low friction. Final Word: Self-lubricating bearings aren’t just a component upgrade—they redefine machinery reliability. By matching the right bearing type to specific operational stresses (see our Application Matrix Table below), engineers can slash downtime and unlock new levels of efficiency. Machine Zone Bearing Type Performance Gain Excavator Track Links Bimetal boundary lubrication 60% fewer replacements in dusty mines Crane Slewing Rings Metal-based sintered 80% lower vibration in rotary joints Hydraulic Valve Guides Metal-plastic composite 50% noise reduction in precision control Ready to eliminate grease headaches? It’s time to rethink your bearing strategy.    

provides customers with Oilless bearing product-related design information for customers to consult.   Advanced production equipment Behind the high yield, the rate is the reliance on advanced production equipment and the unremitting efforts of each employee of viiplus   Revised Section: The Power of Customization (Adding the manufacturing capability point) ... (Keep the existing text explaining Why Customize? and Examples of Custom Part Applications) ... Successfully manufacturing these custom solutions, often with tight tolerances and specific material properties, demands significant investment and expertise. Leading manufacturers understand that delivering consistent quality and high performance, especially at scale, isn't accidental. It hinges on advanced production equipment – think precision CNC machining for metal-backed or plugged bearings, sophisticated injection molding for polymers, controlled atmosphere sintering furnaces, and rigorous automated quality control systems. Behind the high yield rates and the reliability customers depend on, there's a deep reliance on this state-of-the-art machinery. Furthermore, technology alone isn't enough; it must be paired with the unremitting efforts and expertise of a skilled workforce. For companies like Viiplus, this synergy between advanced equipment and dedicated employees is fundamental to consistently producing high-quality standard and custom oilless bearing solutions that meet demanding specifications. Revised Section: Choosing the Right Self-Lubricating Bearing (Adding the design information point) Selecting the appropriate bearing involves considering several factors: Load: Magnitude and type (radial, axial, oscillating, shock). Speed: Rotational or linear speed. Temperature: Operating range and potential extremes. Environment: Presence of dirt, moisture, chemicals, radiation. Mating Surface: Shaft material, hardness, and surface finish. Motion Type: Continuous rotation, oscillation, linear movement. Life Expectancy: Required operating hours. Space Constraints: Allowable dimensions. Cost: Budget vs. long-term value (Total Cost of Ownership).   Navigating these parameters, especially for novel or challenging applications, can be complex. This is where tapping into manufacturer expertise becomes invaluable. Reputable suppliers specializing in Oilless Bearing Design principles don't just sell products; they provide customers with extensive product-related design information for consultation. This often includes detailed datasheets, performance calculators, material compatibility charts, and, crucially, access to application engineers. Consulting these resources and potentially working directly with bearing engineers – particularly when exploring custom solutions – is highly recommended to ensure optimal selection and performance. Why these placements work: Advanced Production Equipment: Placing this within the "Customization" section logically follows the discussion of why custom parts are needed and what they look like. It explains how these often complex parts are reliably made, linking manufacturing capability directly to the feasibility and quality of custom solutions. It uses Viiplus as a concrete example of a company embodying this principle. Design Information: Adding this to the "Choosing the Right Bearing" section makes perfect sense. After listing all the factors a user needs to consider, the natural next step is pointing them toward resources that can help them make that choice correctly. It frames the availability of design information and consultation as a service offered by knowledgeable suppliers to aid in the selection process.   These additions enhance the article by: Adding credibility by discussing the manufacturing process. Providing actionable advice on where to get help (consulting manufacturers/design resources). Integrating the specific points you provided smoothly and contextually. Subtly positioning Viiplus (if that's the intended company) as a capable manufacturer committed to quality, without turning the post into an overt advertisement.