Oilless Braided Composite Self-Lubricated Bearing, Bushing, Steel Backed is a type of bearing that is specifically designed to operate without the need for external lubrication. It consists of a braided composite material, primarily (Polytetrafluoroethylene), which is self-lubricating and able to withstand extreme temperatures and pressures. The steel backing provides structural support and durability, while the composite material ensures smooth, friction-free operation.

This type of bearing is commonly used in applications where lubrication is difficult or impossible, such as in high-temperature or vacuum environments. The self-lubricating properties of the composite allow it to operate effectively without the need for regular maintenance or replacement of lubricants.

The braided composite structure of the bearing also contributes to its durability and wear resistance. The fibers are woven together in a way that creates a strong, yet flexible material that can withstand both compressive and tensile forces. This makes it an excellent choice for applications that require bearings to withstand heavy loads and frequent motion.

Overall, Oilless Braided Composite Self-Lubricated Bearings, Bushings, and Steel Backed products are reliable, efficient, and cost-effective solutions for applications that demand high performance in extreme environments.

Value Bushing Steel Backed Lined Bronze And Brass Bushings-Stainless Steel 316

Steel Backed Bushing High performance steel reinforced bushings, environmental protection is based on steel substrate, central bronze powder, sintered spherical surface that rolls four ethylene () and a mixture of green polymeric material, bearing rolling and sliding. The product is lead-free environmental protection, the wear-resistant performance is excellent, a plastic layer and a copper layer with high strength, fatigue resistance, impact-resistant performance are a good way to an advantage.

Bushings Metric (mm)Imperial (inch) Dimensions Get A quote.
Tolerances, operating clearance (Bushing data)
Shaft and housing tolerances (Design of bushing arrangements)

Maximum load pressure: 180Mpa

Friction factor: 0.03~0.20

Operating temperature range: -90 ° C ~ 180 ° C

Poly tetra fluoroethylene()

It is a polymer made of tetrafluoroethylene as monomer.White waxy, translucent, good heat and cold resistance, can be used in -180 ~ 260 C for a long time.This material has the characteristics of anti - acid, anti - alkali, anti - various organic solvents, almost insoluble in all solvents.At the same time, has the characteristics of high temperature resistance, its coefficient of friction is very low, so it can be used for lubrication, but also become easy to clean the ideal coating of the inner layer of the water pipe;Toxic, human carcinogen.

Property		date
maximum bearing capacityP	Static load	250N/mm²
	Dynamic load	140N/mm²
highest line speedV	Dry friction	2.5m/s
	Oil lubrication	5m/s
High PV value	Dry friction	3.6N/mm²・m/s
	Oil lubrication	50N/mm²・m/s
The coefficient of frictionμ	Dry friction	0.04~0.20
	Oil lubrication	0.02~0.07
The use of temperature		-195℃～+280℃
Coefficient of thermal conductivity		42W/m・K
Coefficient of thermal expansion		11×10-6/K

Characteristics

1.Suitable for use in fatting or lubricating conditions, high bearing capacity, good wear resistance;

2.Suitable for rotating, reciprocating and swinging and other forms of movement and frequent starting, intermittent movement or heavy load and other occasions which are not easy to form oil film lubrication;

3.High load, low speed lubrication conditions with stable low friction coefficient and excellent wear resistance;

4.Friction surface layer can be secondary processing, bearing into the seat hole after processing, can further improve the accuracy of fit;

5.Long working time under boundary lubrication conditions, such as in the process of regular grease maintenance, can extend the service life;

6.Bearings for thin-wall structure, light weight, occupies a small volume, suitable for compact design;

7.Good dimensional stability, high mechanical strength;

POM Composite Bearing

Wrapped sliding bearing, wrapped bushing, steel/POM sliding layer, DIN 1494/ISO 3547, Low-maintenance
TECHNICAL DETAILS
Specific load capacity static	≤ 250 [N/mm2]	Temperature strain	- 40 [°C] to + 130 [°C]
Specific load capacity dynamic	≤ 140 [N/mm2]
Sliding speed	≤ 2.5 [m/s]	Max. PV-value	2.8 [N/mm² x m/s]
Friction value	0.04 [µ] to 0.12 [µ]
MATERIALS
Support material	Steel copper-plated or tin-plated	Intermediate layer	Sintered bronze
Sliding layer	POM (MoS2)/lubrication pockets
TOLERANCE DETAILS
Housing Ø	H7	Shaft tolerance	h8
Bushing inner-Ø after mounting	in the range of D
SHAFT MATERIAL
Steel, hardened or untempered
Surface roughness ≤ Ra 0.8
PROPERTIES
It works with grease or oil lubrication. All kind of movements are suitable for this sliding material. It has good resistance to dirt, is very robust and has a high load capacity.
RANGE OF APPLICATION
truck cranes, agriculture machines, hydraulic cylinders, construction machinery, tale gates
MAINTENANCE
It is a low maintanence bearing material with MoS2 sliding layer and lubrication pockets. An initial greasing during installation is necessary, after that, periodic greasing with oil or grease is mandatory.
MOUNTING ADVISE
Housing	Chamfer min. 1.5 mm x 15-45°, for easy bushing alignment
Shaft	Chamfer 5 mm x 15°, for easy insertion of the shaft
We advises to use a force fitting mandrel for the installation of the bushing. It might be necessary to apply some grease on the outer surface of the bushing when press fitting it into the housing.
Gluing	Adhesive should not contact the sliding surface!

Strusture

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.

self - lubricating oil - free bearing bearing of the molding process

Structure And Composition

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

Operating Performance
Dry	Poor
Oil lubricated	Good
Grease lubricated	Very Good
Water lubricated	Poor
Process fluid lubricated	Poor

· 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

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.

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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.

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• 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.

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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.

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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.

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