Boundary Lubrication Bearings refer to a type of bearings that operate in a lubrication regime where the lubricant film thickness is not sufficient to completely separate the moving surfaces, resulting in direct contact between the bearing surfaces and the lubricant film. This contact creates a boundary layer that partially supports the load, alongside the lubricating film.
Polytetrafluoroethylene () and Polyoxymethylene (POM) are commonly used materials for boundary lubrication bearings due to their unique properties. , known for its excellent chemical stability, low friction coefficient, and high temperature resistance, is often used as a bearing coating or lining material. POM, on the other hand, is a thermoplastic with good mechanical properties, wear resistance, and self-lubricating characteristics, making it suitable for low-friction applications.
When these materials are used in boundary lubrication bearings, they are often backed with bearing steel. Bearing steel is a high-carbon steel alloy that provides the necessary strength and rigidity to support the load while also resisting deformation and wear. The combination of or POM as the bearing surface material and bearing steel as the backing material results in a bearing that can effectively handle boundary lubrication conditions while minimizing wear and friction.

Gear Box and Engine Ball and Roller Bearings Online Solutions Boundary Lubrication Bearings & Bushing Replacement for Textile machines,Medicine machines & Food Machines

Shaft sleeve bushing

The VIIPLUS Metal-Polymer Bearings structure of this prelubricated Bule bushing consists of spherical powdered bronze sintered onto a steel backing and polyacetal resin bule impregnated into the surface.

VIIPLUS BLUE POM Coted bushing based sliding bearing also similar POM bushing, boundary lubrication bearing,SF-2 oilless bearing,dry bearing, POM lined plain dry bush. It has similar material structure with bushing. The difference is the layer with POM coated. We are leading exporter of POM Coated Bushing,sliding bearing,boundary lubrication bearing,Dry Bearing in china.

The self-lubricating bearings with the features of no oil or grease needed or only little oil or grease is needed during the operation and furthermore, so it has the advantages on the applicaitons to the machineries such as the Textile machines, Medicine machines, Food Machines, Beverage Bulking Machines with critical requirement on cleaning and environment conditions.

The structural characteristics

VIIPLUS metal composite boundary lubrication materials for high quality low carbon steel substrate, the sintering layer spherical porous copper powder, copper surface with modified polyformaldehyde (POM) or poly ( ketone) (PEEK) of wear-resistant lubricating materials as bearing layer, the rules of surface oil cavity not only can store fat, and can effectively buried outside the invasion of dust, improve the service life of bearing.This material has excellent mechanical bearing capacity. The intermediate copper powder layer can not only transfer the heat generated in the running process of the bearing in time, but also improve the bonding strength between the plastic layer and the substrate.The surface wear resistant material design based on POM or PEEK is suitable for grease lubrication. The bearing surface is regularly arranged with oil holes for storing grease to ensure the optimal distribution of lubricant on the whole bearing surface.

The product application

Products are widely used in
Automobile industry: pedal assembly, balance shaft sleeve, brake pliers, steering pin shaft sleeve and truck tail plate shaft sleeve;
Logistics machinery: truck, crane, truck crane, forest machinery, packaging machinery, etc.;And hydraulic motors, hydraulic cylinders, pneumatic components, agricultural machinery, etc.
In practical application, different filling materials can be added in the plastic surface layer POM/PEEK according to different operating conditions and environmental requirements

Polytetrafluoroethylene () & Polyoxymethylene (POM) Bearing Steel backing

Metal-Polymer Bearings Bushings Boundary Lubricating Bearings food machinery SF-2L blue POM Bushes lead-free | VSB-20

Detailed information

Boundary lubrication lead-free bearing is improved on the basis of VSB-20. With low friction coefficient, good wear resistance and long service life, products can be used for higher environmental requirements such as food machinery because the product does not contain lead.

Steel + Bronze Powder + POM blue

Typical Applications

Generally for dry-running applications, shock absorbers, hydraulic applications, pneumatic cylinders, medical equipments, textile machines, agricultural applications , as well as in the office sector, etc.

VSB-20 Boundary lubrication bearing High Quality POM Bush China Manufacturer
· marginally lubricated bushings for grease or oil lubricated applications
· Standard parts contain grease indents in the sliding layer; plain sliding layer available by request
· Optimum performance under relatively high loads and low speeds
· Suitable for linear, oscillating and rotating movements
· Wide range of parts available from stock

Suitable for rotating and oscillating movement, less maintenance requirements due to the long re-lubrication intervals, lower wear, lower susceptibility to edge loading, no absorption of water and therefore no swelling, good damping behaviours, good resistance to shock loads.

1. POM thickness 0.30~0.50 mm. It provides high wearresistance and low friction even with only minute volume oflubricant are supplied, this bearing surface carries a pattern of circular indents which should be filled with grease on assembly of the bearing.
2. Sintered bronze powder thickness 0.20-0.35mm. A special composition of powdered copper is thermally fused to the steel backing. This contact layer acts as an anchor for the layer and conducts the thermal build up away from the bearing surfaces.
3. Low-carbon steel.Setting the foundation of the bushings, the steel back provides exceptional stability,load carrying and heat dissipation characteristics.

· Metal-Polymer Composite Bushing Material
· Steel Back + Porous Bronze Sinter +POM with Lubrication Indents

Availability

Bearing forms available in standard dimensions
· Cylindrical bushes
· Thrust washers
· Sliding plates

Metric bearings and imperial bushings made to order: standard bushing forms in special dimensions, half-bushings, special shapes obtained by stamping, bearings with locating notches, lubricant holes and machined grooves, customized bushing designs

Pom Coated Bearing, Metal-Polymer Composite Bearing, Manufacture, Wholesale

Beyond Grease: A Deep Dive into Oilless Bushings & Why Viiplus Leads the Way

Friction is the enemy of efficiency. In countless machines, from massive industrial equipment to intricate automotive components, the constant battle against wear and tear dictates performance, longevity, and maintenance costs. Traditionally, grease and oil have been the go-to solutions, but they come with their own set of challenges: frequent re-lubrication, potential contamination, environmental concerns, and limitations in extreme conditions.

Enter the world of oilless bushings, also known as self-lubricating bearings or sliding bearings. These innovative components offer a smarter way to manage friction, delivering reliable movement without the need for external lubrication.

At Viiplus (www.viiplus.com), we don't just supply these components; we engineer solutions. Leveraging deep expertise in metallurgy and tribology (the science of friction, wear, and lubrication), we've become a leading name in sliding bearing technology. But what exactly are oilless bushings, and why should they be on your radar? Let's dive deeper.

What Exactly Are Oilless Bushings? The Science of Self-Lubrication

Unlike traditional ball or roller bearings that rely on rolling elements and require constant lubrication films, oilless bushings operate on the principle of sliding motion. Their "magic" lies in their material composition and structure, designed to provide their own lubrication at the bearing surface. This can be achieved through several key technologies:

1. Solid Lubricants Embedded: Materials like graphite, MoS₂, or PTFE are embedded directly into the metallic matrix (often bronze) of the bushing. As the shaft rotates or slides, a minuscule amount of this solid lubricant is transferred to the mating surface, creating a low-friction film.

2. Porous Metal Structures: Sintered bronze or iron materials are created with microscopic pores. These pores are vacuum-impregnated with oil during manufacturing. In operation, slight heating causes the oil to expand and seep onto the bearing surface, providing lubrication. When it cools, the capillary action draws the oil back in, creating a closed-loop system.

3. Layered Composites: These often feature a strong backing (like steel), an intermediate sintered layer (like bronze), and a low-friction overlay (often PTFE-based). The PTFE layer provides the primary sliding surface, offering extremely low friction.

Contrasting Logic: Oilless vs. Traditionally Lubricated Bearings

The Tangible Benefits: Why Make the Switch?

Choosing oilless bushings isn't just about eliminating grease guns. It's about unlocking significant operational advantages:

• Drastically Reduced Maintenance: This is the most obvious benefit. No re-greasing means less labor, less scheduled downtime, and simplified maintenance protocols. Imagine the savings across a factory floor!

• Enhanced Reliability: Lubricant starvation is a major cause of bearing failure. Self-lubricating bearings ensure consistent lubrication, leading to predictable performance and longer service life, especially in hard-to-reach locations.

• Superior Performance in Harsh Conditions: Oilless bushings excel where traditional lubricants fail:

  • High Temperatures: Certain types can operate at temperatures far exceeding the limits of conventional greases.

  • Low Temperatures: No grease means no stiffening or freezing issues.

  • Contaminated Environments: The absence of sticky grease reduces the ingress of dirt, dust, and debris.

  • Vacuum or Underwater: Ideal for applications where liquid lubricants are impractical or impossible.

  •  
  •  
  •  

• Cost Savings (Total Cost of Ownership): While the initial purchase price might sometimes be higher, the TCO is often significantly lower due to savings on lubricants, labor, downtime, and potential component failure replacement.

• Environmental Friendliness: Eliminating oil and grease leakage prevents contamination of products, machinery, and the environment. Crucial for industries like food processing, pharmaceuticals, and textiles.

• Compact & Simplified Designs: Without the need for lubrication systems (nipples, lines, reservoirs), machine designs can be more compact and streamlined.

Exploring Viiplus's Portfolio: Finding Your Solution

Viiplus offers a comprehensive range of self-lubricating bearings designed to meet diverse application needs. Understanding the different series helps in selection:

• JDB Series (Graphite Plugged Bronze): Excellent for high-load, low-speed applications, intermittent motion, and high temperatures. The graphite plugs provide continuous solid lubrication. Ideal for heavy machinery, molds, and hydraulic components.

• SF Series (PTFE-Based Composite): Typically metal-backed (SF-1: steel, SF-2: steel/bronze) with a PTFE-based lining. Offers very low friction, good wear resistance, and suitability for dry running or marginal lubrication. Common in automotive, office equipment, and hydraulics.

• JF Series (Bimetal Bushings): Combines a steel backing with a sintered bronze or lead-bronze lining. Good load capacity and fatigue strength. Often used with grease or oil but can operate marginally lubricated. Found in engines, chassis parts, and agricultural machinery.

• FB Series (Wrapped Bronze): Often made from bronze strip, sometimes with lubrication pockets or through-holes. A cost-effective solution for medium loads and speeds, typically requiring initial greasing but offering extended re-lubrication intervals.

Quick Comparison Chart (General Guide):

(Note: This is a simplified guide. Always consult specific product data sheets or Viiplus experts for precise application requirements.)

Uncertain which material or type suits your project? Our Bushing Material Selection Guide is designed to help, or Contact Us for a Free Quote and Expert Advice.

Why Partner with Viiplus? Expertise Meets Quality

Choosing the right supplier is as critical as choosing the right bushing. Here’s why companies worldwide trust Viiplus:

• Deep Expertise: Our foundation in metallurgy and tribology, coupled with a talented R&D team, means we understand the science behind reliable movement. We don't just sell; we solve friction challenges.

• Uncompromising Quality: We employ advanced manufacturing techniques (including sand casting, centrifugal casting, metal casting, investment casting) and a rigorous quality management system, ensuring every bushing meets the highest standards.

• Comprehensive Range: From standard metric sizes in JDB, SF, JF, and FB series to custom solutions including cylindrical, flange, double flange bushings, wear plates, and guide rails – we have the portfolio to match your needs.

• Global Reach, Seamless Logistics: Based in China, we ship sliding bearings worldwide. Our professional team handles customs clearance efficiently, ensuring smooth, timely delivery with all necessary documentation.

• Customer-Centric Approach: We believe in ethical practices and building trust. We offer flexible production (single units to large series), competitive pricing, and  online support.