Availability

Bearing forms made to order: Cylindrical bushes with bronze alloy according to ISO 4379, special parts according to ISO, DIN or customer design, special alloysThrust Washer: boundary lubrication thrust washer gasket

Thrust Washer category: oil-free self lubricated bearings

Thrust Washer model: sf-2wc

Material organization

1. The mixture of modified polyformaldehyde (POM) and lead has high wear resistance and low friction coefficient even in the case of instant oil shortage. The bearing surface is regularly arranged with a spiral Angle of the oil storage pit, assembly, must be coated with grease.
2. The copper powder layer of 0.2-0.3mm has good bearing capacity and wear resistance, and good thermal conductivity can transfer the heat generated during the operation of the bearing in time. The composite material can penetrate into the gap of the copper powder ball and improve the bonding strength.
3. Low carbon steel 0.4~2.2, improve the bearing capacity and heat transfer function of the bearing.
4. Copper/tin electroplating, copper coating 0.008mm, tin coating 0.05mm, so that the bearing has a good corrosion resistance function.

WASHER SIZE CHART

Application characteristics

It is especially suitable for the rotating motion, swinging motion under heavy load and low speed as well as the parts that are often opened and closed under load but not easy to form fluid lubrication. Under the condition of boundary lubrication, it can be used for a long time without refueling and maintenance, and refueling in the process can prolong the service life of the bearing. The plastic layer on its surface can leave a certain amount of margin when the bushing is formed, and can be processed by itself after being pressed into the hole, so as to achieve a better assembly size.
At present, it is mainly used in metallurgical machinery, mining machinery, water conservancy machinery, automobile chassis, construction machinery, agricultural machinery, steel rolling machinery, etc.
Sf-2wc gasket series standard size

1. The mixture of modified polyformaldehyde (POM) and lead has high wear resistance and low friction coefficient even in the case of instant oil shortage. The bearing surface is regularly arranged with a spiral Angle of the oil storage pit, assembly, must be coated with grease.
2. The copper powder layer of 0.2-0.3mm has good bearing capacity and wear resistance, and good thermal conductivity can transfer the heat generated during the operation of the bearing in time. The composite material can penetrate into the gap of the copper powder ball and improve the bonding strength.
3. Low carbon steel 0.4~2.2, improve the bearing capacity and heat transfer function of the bearing.
4. Copper/tin electroplating, copper coating 0.008mm, tin coating 0.05mm, so that the bearing has a good corrosion resistance function.

Composite bearing: boundary lubricated bearing is made of high quality low carbon steel plate, with sintered spherical bronze powder in the middle, surface rolling modified polyambrose (POM) and oil storage pit. Good bearing capacity, good wear resistance. It is suitable for normal temperature conditions and low speed heavy loading places, replace the traditional copper sleeve, both reduce the cost and extend the service life. In the boundary lubrication condition for a long time without oiling maintenance, but in the overlayer oiling makes the bearing service life longer. The surface plastic can keep a certain amount of margin when it is processed and molded, and can be processed by itself after it is assembled and pressed into the seat hole, so as to achieve a better assembly size.
It is widely used in automobile chassis, forging and pressing machine, metallurgy and mining machinery, engineering machinery, water and electricity, steel rolling industry and other fields. The product surface does not contain lead, the use domain may extend to has the environmental protection request domain.

Maximum bearing pressure (static): 250 N/mm2
Maximum bearing pressure (dynamic): 140N/mm 2
Friction coefficient (grease lubrication) : 0.05 ~ 0.25
Maximum sliding speed (grease lubrication) : 2.5m/s
Maximum PV value (grease lubrication) : 2.8n/mm2. M/s
Operating temperature: -40℃~+130℃

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Application field

VIIPLUS Is one of the solid enterprises in China specialized in producing self-lubricating bearing, sliding bearing, composite bearing, oil-free bearing, dry bearing and maintenance-free bearing. The quality and performance of the products have reached the level of foreign counterparts.

Application field
Due to the combination of material characteristics and performance, COMPOSITE WASHER bushings has been more widely used and promoted than common self-lubricating bearings. Thin wall structure, small size, light weight, making COMPOSITE bushings bushing easy to use. Based on the material properties of the wear-resistant layer mixture,pom products are suitable for difficult-to-maintain and difficult-to-oil, oil-free and low-oil applications. During use, the mixture forms a transfer film to protect the grinding shaft from shaft biting. mixture has excellent wear resistance and low friction coefficient, as well as an appropriate amount of elastoplasticity, which can distribute stress on a wide contact surface, thus improving the bearing capacity of sliding bearing products (see). Therefore, sliding bearing products are suitable for rotating, swinging, axial sliding and other occasions.

Agricultural machinery and food machinery
Tractors, combine harvesters, baling machines (of hay, straw, etc); Baling press, meat processing equipment, potato harvester, spray machine, grain dryer, planting equipment, brewing equipment, etc.

The car industry
In the typical application of the industry include: throttle, brake and clutch pedal, mirror adjustment mechanism, wipers, Windows hoisting mechanism, skylight organization, joystick, seat belt tensioning mechanism, seat adjustment mechanism, shock absorber, engine, suspension, carburetor, door hinge, suitcase, hood hinge, with tie rod and the ball head, throttle valve, steering column and steering device, etc.

Home appliances, commercial appliances, hospital equipment
Air conditioning, vacuum cleaner, dishwasher, sewing machine, washing machine, refrigerator, copier, printer, scanner, mail processing system, letter sorting device, dental equipment, X-ray equipment, operating table, etc.

Hydraulic industry
Gear pump, water pump, piston pump, ball valve, butterfly valve, mixing valve, control valve, reciprocating air compressor, hydraulic brake, centrifugal compressor, hydraulic cylinder, etc.

Construction machinery, machinery industry
Excavators, hydraulic lifts, concrete mixers, fork-lift trucks, hydraulic cylinders, belt tensioning devices, cranes, mortar trucks, pallet fork-lift trucks, pneumatic lifts, bulldozers, escalators, pedestrian walkways, heavy trailers, liquid infusion equipment, side loaders, etc.

Other applications
Bicycles, motorcycles, tools, spinning machines, reciprocating saws, cutting machines, textile machines, weaving machines, button machines, packaging systems, nailing machinery equipment, glass manufacturing equipment, etc.

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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